Sanitize parameters on user edit page (fixes #289)

- `/api/library/continue_reading`
- `/api/library/start_reading`
- `/api/library/recently_added`

.all-contributorsrc

@@ -0,0 +1,138 @@
+{
+  "projectName": "Mango",
+  "projectOwner": "hkalexling",
+  "repoType": "github",
+  "repoHost": "https://github.com",
+  "files": [
+    "README.md"
+  ],
+  "imageSize": 100,
+  "commit": false,
+  "commitConvention": "none",
+  "contributors": [
+    {
+      "login": "hkalexling",
+      "name": "Alex Ling",
+      "avatar_url": "https://avatars1.githubusercontent.com/u/7845831?v=4",
+      "profile": "https://github.com/hkalexling/",
+      "contributions": [
+        "code",
+        "doc",
+        "infra"
+      ]
+    },
+    {
+      "login": "jaredlt",
+      "name": "jaredlt",
+      "avatar_url": "https://avatars1.githubusercontent.com/u/8590311?v=4",
+      "profile": "https://github.com/jaredlt",
+      "contributions": [
+        "code",
+        "ideas",
+        "design"
+      ]
+    },
+    {
+      "login": "shincurry",
+      "name": "ココロ",
+      "avatar_url": "https://avatars1.githubusercontent.com/u/4946624?v=4",
+      "profile": "https://windisco.com/",
+      "contributions": [
+        "infra"
+      ]
+    },
+    {
+      "login": "noirscape",
+      "name": "Valentijn",
+      "avatar_url": "https://avatars0.githubusercontent.com/u/13433513?v=4",
+      "profile": "https://catgirlsin.space/",
+      "contributions": [
+        "infra"
+      ]
+    },
+    {
+      "login": "flying-sausages",
+      "name": "flying-sausages",
+      "avatar_url": "https://avatars1.githubusercontent.com/u/23618693?v=4",
+      "profile": "https://github.com/flying-sausages",
+      "contributions": [
+        "doc",
+        "ideas"
+      ]
+    },
+    {
+      "login": "XavierSchiller",
+      "name": "Xavier",
+      "avatar_url": "https://avatars1.githubusercontent.com/u/22575255?v=4",
+      "profile": "https://github.com/XavierSchiller",
+      "contributions": [
+        "infra"
+      ]
+    },
+    {
+      "login": "WROIATE",
+      "name": "Jarao",
+      "avatar_url": "https://avatars3.githubusercontent.com/u/44677306?v=4",
+      "profile": "https://github.com/WROIATE",
+      "contributions": [
+        "infra"
+      ]
+    },
+    {
+      "login": "Leeingnyo",
+      "name": "이인용",
+      "avatar_url": "https://avatars0.githubusercontent.com/u/6760150?v=4",
+      "profile": "https://github.com/Leeingnyo",
+      "contributions": [
+        "code"
+      ]
+    },
+    {
+      "login": "h45h74x",
+      "name": "Simon",
+      "avatar_url": "https://avatars1.githubusercontent.com/u/27204033?v=4",
+      "profile": "http://h45h74x.eu.org",
+      "contributions": [
+        "code"
+      ]
+    },
+    {
+      "login": "davidkna",
+      "name": "David Knaack",
+      "avatar_url": "https://avatars.githubusercontent.com/u/835177?v=4",
+      "profile": "https://github.com/davidkna",
+      "contributions": [
+        "infra"
+      ]
+    },
+    {
+      "login": "lincolnthedev",
+      "name": "i use arch btw",
+      "avatar_url": "https://avatars.githubusercontent.com/u/41193328?v=4",
+      "profile": "https://lncn.dev",
+      "contributions": [
+        "infra"
+      ]
+    },
+    {
+      "login": "BradleyDS2",
+      "name": "BradleyDS2",
+      "avatar_url": "https://avatars.githubusercontent.com/u/2174921?v=4",
+      "profile": "https://github.com/BradleyDS2",
+      "contributions": [
+        "doc"
+      ]
+    },
+    {
+      "login": "nduja",
+      "name": "Robbo",
+      "avatar_url": "https://avatars.githubusercontent.com/u/69299134?v=4",
+      "profile": "https://github.com/nduja",
+      "contributions": [
+        "code"
+      ]
+    }
+  ],
+  "contributorsPerLine": 7,
+  "skipCi": true
+}

.ameba.yml

@@ -0,0 +1,14 @@
+Lint/UselessAssign:
+  Excluded:
+    - src/routes/*
+    - src/server.cr
+Lint/UnusedArgument:
+  Excluded:
+    - src/routes/*
+Metrics/CyclomaticComplexity:
+  Enabled: false
+Layout/LineLength:
+  Enabled: true
+  MaxLength: 80
+  Excluded:
+    - src/routes/api.cr

.dockerignore

@@ -0,0 +1,9 @@
+node_modules
+lib
+Dockerfile
+Dockerfile.arm32v7
+Dockerfile.arm64v8
+README.md
+.all-contributorsrc
+env.example
+.github/

.github/FUNDING.yml

@@ -0,0 +1,5 @@
+# These are supported funding model platforms
+
+open_collective: mango
+patreon: hkalexling
+ko_fi: hkalexling

.github/ISSUE_TEMPLATE/bug_report.md

@@ -26,7 +26,7 @@ A clear and concise description of what you expected to happen.
  - Mango Version [e.g. v0.1.0]
 
 **Docker (if you are running Mango in a Docker container)**
-- The `docker-compose.yml` file you are using
+- The `docker-compose.yml` file you are using, or your `.env` file.
 
 **Additional context**
 Add any other context about the problem here. Add screenshots if applicable.

.github/ISSUE_TEMPLATE/feature_request.md

@@ -8,10 +8,13 @@ assignees: ''
 ---
 
 **Is your feature request related to a problem? Please describe.**
-A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+A clear and concise description of what the problem is. E.g. I'm always frustrated when [...]
 
 **Describe the solution you'd like**
 A clear and concise description of what you want to happen.
 
+**Describe a small use-case for this feature request**
+How would you imagine this to be used? What would be the advantage of this for the users of the application?
+
 **Additional context**
 Add any other context or screenshots about the feature request here.

.github/autoapproval.yml

@@ -0,0 +1,6 @@
+from_owner:
+  - hkalexling
+required_labels:
+  - autoapprove
+apply_labels:
+  - autoapproved

.github/workflows/build.yml

@@ -0,0 +1,40 @@
+name: Build
+
+on:
+  push:
+    branches: [ master, dev, hotfix/* ]
+  pull_request:
+    branches: [ master, dev ]
+
+jobs:
+  build:
+    if: "!contains(github.event.head_commit.message, 'skip ci')"
+
+    runs-on: ubuntu-latest
+    container:
+      image: crystallang/crystal:1.0.0-alpine
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Install dependencies
+      run: apk add --no-cache yarn yaml-static sqlite-static libarchive-dev libarchive-static acl-static expat-static zstd-static lz4-static bzip2-static libjpeg-turbo-dev libpng-dev tiff-dev
+    - name: Build
+      run: make static || make static
+    - name: Linter
+      run: make check
+    - name: Run tests
+      run: make test
+    - name: Upload binary
+      uses: actions/upload-artifact@v2
+      with:
+        name: mango
+        path: mango
+    - name: build arm32v7 object file
+      run: make arm32v7 || make arm32v7
+    - name: build arm64v8 object file
+      run: make arm64v8 || make arm64v8
+    - name: Upload object files
+      uses: actions/upload-artifact@v2
+      with:
+        name: object files
+        path: ./*.o

.github/workflows/dockerhub.yml

@@ -0,0 +1,19 @@
+name: Publish Dockerhub
+on:
+  release:
+    types: [published]
+jobs:
+  update:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@master
+    - name: Get release version
+      id: get_version
+      run: echo "RELEASE_VERSION=$(echo ${GITHUB_REF:10})" >> $GITHUB_ENV
+    - name: Publish to Dockerhub
+      uses: elgohr/Publish-Docker-Github-Action@master
+      with:
+        name: hkalexling/mango
+        username: ${{ secrets.DOCKER_USERNAME }}
+        password: ${{ secrets.DOCKER_PASSWORD }}
+        tags: "latest,${{ env.RELEASE_VERSION }}"

.gitignore

@@ -7,4 +7,10 @@ node_modules
 yarn.lock
 dist
 mango
-docker-compose.yml
+.env
+*.md
+public/css/uikit.css
+public/img/*.svg
+public/js/*.min.js
+public/css/*.css
+public/webfonts

Dockerfile

@@ -1,18 +1,15 @@
-FROM crystallang/crystal:0.32.0
-
-RUN apt-get update && apt-get install -y curl
-
-RUN curl -sL https://deb.nodesource.com/setup_10.x | bash -
-RUN curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add -
-RUN echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list
-
-RUN apt-get update && apt-get install -y nodejs yarn libsqlite3-dev
+FROM crystallang/crystal:1.0.0-alpine AS builder
 
 WORKDIR /Mango
 
 COPY . .
-COPY package*.json .
+RUN apk add --no-cache yarn yaml-static sqlite-static libarchive-dev libarchive-static acl-static expat-static zstd-static lz4-static bzip2-static libjpeg-turbo-dev libpng-dev tiff-dev
+RUN make static || make static
 
-RUN make && make install
+FROM library/alpine
 
-CMD ["mango"]
+WORKDIR /
+
+COPY --from=builder /Mango/mango /usr/local/bin/mango
+
+CMD ["/usr/local/bin/mango"]

Dockerfile.arm32v7

@@ -0,0 +1,15 @@
+FROM arm32v7/ubuntu:18.04
+
+RUN apt-get update && apt-get install -y wget git make llvm-8 llvm-8-dev g++ libsqlite3-dev libyaml-dev libgc-dev libssl-dev libcrypto++-dev libevent-dev libgmp-dev zlib1g-dev libpcre++-dev pkg-config libarchive-dev libxml2-dev libacl1-dev nettle-dev liblzo2-dev liblzma-dev libbz2-dev libjpeg-turbo8-dev libpng-dev libtiff-dev
+
+RUN git clone https://github.com/crystal-lang/crystal && cd crystal && git checkout 1.0.0 && make deps && cd ..
+RUN git clone https://github.com/kostya/myhtml && cd myhtml/src/ext && git checkout v1.5.8 && make && cd ..
+RUN git clone https://github.com/jessedoyle/duktape.cr && cd duktape.cr/ext && git checkout v1.0.0 && make && cd ..
+RUN git clone https://github.com/hkalexling/image_size.cr && cd image_size.cr && git checkout v0.5.0 && make && cd ..
+
+COPY mango-arm32v7.o .
+
+RUN cc 'mango-arm32v7.o' -o '/usr/local/bin/mango' -rdynamic -lxml2 -L/image_size.cr/ext/libwebp -lwebp -L/image_size.cr/ext/stbi -lstbi /myhtml/src/ext/modest-c/lib/libmodest_static.a -L/duktape.cr/src/.build/lib -L/duktape.cr/src/.build/include -lduktape -lm `pkg-config libarchive --libs` -lz `command -v pkg-config > /dev/null && pkg-config --libs --silence-errors libssl || printf %s '-lssl -lcrypto'` `command -v pkg-config > /dev/null && pkg-config --libs --silence-errors libcrypto || printf %s '-lcrypto'` -lgmp -lsqlite3 -lyaml -lpcre -lm /usr/lib/arm-linux-gnueabihf/libgc.so -lpthread /crystal/src/ext/libcrystal.a -levent -lrt -ldl -L/usr/bin/../lib/crystal/lib -L/usr/bin/../lib/crystal/lib
+
+CMD ["/usr/local/bin/mango"]
+

Dockerfile.arm64v8

@@ -0,0 +1,14 @@
+FROM arm64v8/ubuntu:18.04
+
+RUN apt-get update && apt-get install -y wget git make llvm-8 llvm-8-dev g++ libsqlite3-dev libyaml-dev libgc-dev libssl-dev libcrypto++-dev libevent-dev libgmp-dev zlib1g-dev libpcre++-dev pkg-config libarchive-dev libxml2-dev libacl1-dev nettle-dev liblzo2-dev liblzma-dev libbz2-dev libjpeg-turbo8-dev libpng-dev libtiff-dev
+
+RUN git clone https://github.com/crystal-lang/crystal && cd crystal && git checkout 1.0.0 && make deps && cd ..
+RUN git clone https://github.com/kostya/myhtml && cd myhtml/src/ext && git checkout v1.5.8 && make && cd ..
+RUN git clone https://github.com/jessedoyle/duktape.cr && cd duktape.cr/ext && git checkout v1.0.0 && make && cd ..
+RUN git clone https://github.com/hkalexling/image_size.cr && cd image_size.cr && git checkout v0.5.0 && make && cd ..
+
+COPY mango-arm64v8.o .
+
+RUN cc 'mango-arm64v8.o' -o '/usr/local/bin/mango' -rdynamic -lxml2 -L/image_size.cr/ext/libwebp -lwebp -L/image_size.cr/ext/stbi -lstbi /myhtml/src/ext/modest-c/lib/libmodest_static.a -L/duktape.cr/src/.build/lib -L/duktape.cr/src/.build/include -lduktape -lm `pkg-config libarchive --libs` -lz `command -v pkg-config > /dev/null && pkg-config --libs --silence-errors libssl || printf %s '-lssl -lcrypto'` `command -v pkg-config > /dev/null && pkg-config --libs --silence-errors libcrypto || printf %s '-lcrypto'` -lgmp -lsqlite3 -lyaml -lpcre -lm /usr/lib/aarch64-linux-gnu/libgc.so -lpthread /crystal/src/ext/libcrystal.a -levent -lrt -ldl -L/usr/bin/../lib/crystal/lib -L/usr/bin/../lib/crystal/lib
+
+CMD ["/usr/local/bin/mango"]

Makefile

@@ -1,4 +1,4 @@
-PREFIX=/usr/local
+PREFIX ?= /usr/local
 INSTALL_DIR=$(PREFIX)/bin
 
 all: uglify | build
@@ -7,15 +7,35 @@ uglify:
 	yarn
 	yarn uglify
 
+setup: libs
+	yarn
+	yarn gulp dev
+
 build: libs
-	crystal build src/mango.cr --release --progress
+	crystal build src/mango.cr --release --progress --error-trace
+
+static: uglify | libs
+	crystal build src/mango.cr --release --progress --static --error-trace
 
 libs:
-	shards install
+	shards install --production
 
 run:
 	crystal run src/mango.cr --error-trace
 
+test:
+	crystal spec
+
+check:
+	crystal tool format --check
+	./bin/ameba
+
+arm32v7:
+	crystal build src/mango.cr --release --progress --error-trace --cross-compile --target='arm-linux-gnueabihf' -o mango-arm32v7
+
+arm64v8:
+	crystal build src/mango.cr --release --progress --error-trace --cross-compile --target='aarch64-linux-gnu' -o mango-arm64v8
+
 install:
 	cp mango $(INSTALL_DIR)/mango
 

README.md

@@ -1,38 +1,46 @@
-
-
-
 ![banner](./public/img/banner-paddings.png)
 
 # Mango
 
-[![Gitter](https://badges.gitter.im/mango-cr/mango.svg)](https://gitter.im/mango-cr/mango?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge)
+[![Patreon](https://img.shields.io/badge/support-patreon-brightgreen?link=https://www.patreon.com/hkalexling)](https://www.patreon.com/hkalexling) ![Build](https://github.com/hkalexling/Mango/workflows/Build/badge.svg) [![Gitter](https://badges.gitter.im/mango-cr/mango.svg)](https://gitter.im/mango-cr/mango?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge) [![Discord](https://img.shields.io/discord/855633663425118228?label=discord)](http://discord.com/invite/ezKtacCp9Q)
 
 Mango is a self-hosted manga server and reader. Its features include
 
 - Multi-user support
-- Supports both `.zip` and `.cbz` formats
+- OPDS support
+- Dark/light mode switch
+- Supported formats: `.cbz`, `.zip`, `.cbr` and `.rar`
+- Supports nested folders in library
 - Automatically stores reading progress
+- Thumbnail generation
+- Supports [plugins](https://github.com/hkalexling/mango-plugins) to download from third-party sites
 - The web reader is responsive and works well on mobile, so there is no need for a mobile app
 - All the static files are embedded in the binary, so the deployment process is easy and painless
 
+Please check the [Wiki](https://github.com/hkalexling/Mango/wiki) for more information.
+
 ## Installation
 
 ### Pre-built Binary
 
-1. Simply download the pre-built binary file `mango` for the latest [release](https://github.com/hkalexling/Mango/releases). All the dependencies are statically linked, and it should work with most Linux systems on amd64.
+Simply download the pre-built binary file `mango` for the latest [release](https://github.com/hkalexling/Mango/releases). All the dependencies are statically linked, and it should work with most Linux systems on amd64.
 
 ### Docker
 
 1. Make sure you have docker installed and running. You will also need `docker-compose`
 2. Clone the repository
-3. Copy `docker-compose.example.yml` to `docker-compose.yml`
-4. Modify the `volumes` in `docker-compose.yml` to point the directories to desired locations on the host machine
+3. Copy the `env.example` file to `.env`
+4. Fill out the values in the `.env` file. Note that the main and config directories will be created if they don't already exist. The files in these folders will be owned by the root user
 5. Run `docker-compose up`. This should build the docker image and start the container with Mango running inside
-6. Head over to `localhost:9000` to log in
+6. Head over to `localhost:9000` (or a different port if you changed it) to log in
+
+### Docker (via Dockerhub)
+
+The official docker images are available on [Dockerhub](https://hub.docker.com/r/hkalexling/mango).
 
 ### Build from source
 
-1. Make sure you have Crystal, Node and Yarn installed. You might also need to install the development headers for `libsqlite3` and `libyaml`.
+1. Make sure you have `crystal`, `shards` and `yarn` installed. You might also need to install the development headers of some libraries. Please see the [Dockerfile](https://github.com/hkalexling/Mango/blob/master/Dockerfile) for the full list of dependencies
 2. Clone the repository
 3. `make && sudo make install`
 4. Start Mango by running the command `mango`
@@ -43,11 +51,21 @@ Mango is a self-hosted manga server and reader. Its features include
 ### CLI
 
 ```
-Mango e-manga server/reader. Version 0.1.0
+  Mango - Manga Server and Web Reader. Version 0.25.0
 
-    -v, --version                    Show version
-    -h, --help                       Show help
-    -c PATH, --config=PATH           Path to the config file. Default is `~/.config/mango/config.yml`
+  Usage:
+
+    mango [sub_command] [options]
+
+  Options:
+
+    -c PATH, --config=PATH           Path to the config file [type:String]
+    -h, --help                       Show this help.
+    -v, --version                    Show version.
+
+  Sub Commands:
+
+    admin   Run admin tools
 ```
 
 ### Config
@@ -56,30 +74,50 @@ The default config file location is `~/.config/mango/config.yml`. It might be di
 
 ```yaml
 ---
+host: 0.0.0.0
 port: 9000
+base_url: /
+session_secret: mango-session-secret
 library_path: ~/mango/library
 db_path: ~/mango/mango.db
+queue_db_path: ~/mango/queue.db
 scan_interval_minutes: 5
+thumbnail_generation_interval_hours: 24
 log_level: info
+upload_path: ~/mango/uploads
+plugin_path: ~/mango/plugins
+download_timeout_seconds: 30
+library_cache_path: ~/mango/library.yml.gz
+cache_enabled: false
+cache_size_mbs: 50
+cache_log_enabled: true
+disable_login: false
+default_username: ""
+auth_proxy_header_name: ""
 ```
 
-- `scan_interval_minutes` can be any non-negative integer. Setting it to `0` disables the periodic scan
+- `scan_interval_minutes`, `thumbnail_generation_interval_hours` can be any non-negative integer. Setting them to `0` disables the periodic tasks
 - `log_level` can be `debug`, `info`, `warn`, `error`, `fatal` or `off`. Setting it to `off` disables the logging
+- You can disable authentication by setting `disable_login` to true. Note that `default_username` must be set to an existing username for this to work.
+- By setting `cache_enabled` to `true`, you can enable an experimental feature where Mango caches library metadata to improve page load time. You can further fine-tune the feature with `cache_size_mbs` and `cache_log_enabled`.
 
-### Required Library Structure
+### Library Structure
 
-Please make sure that your library directory has the following structure:
+You can organize your archive files in nested folders in the library directory. Here's an example:
 
 ```
 .
 ├── Manga 1
-│   └── Manga 1.cbz
+│   ├── Volume 1.cbz
+│   ├── Volume 2.cbz
+│   ├── Volume 3.cbz
+│   └── Volume 4.zip
 └── Manga 2
-    ├── Vol 0001.zip
-    ├── Vol 0002.zip
-    ├── Vol 0003.zip
-    ├── Vol 0004.zip
-    └── Vol 0005.zip
+    └── Vol. 1
+        └── Ch.1 - Ch.3
+            ├── 1.zip
+            ├── 2.zip
+            └── 3.zip
 ```
 
 ### Initial Login
@@ -96,6 +134,10 @@ Title:
 
 ![title screenshot](./.github/screenshots/title.png)
 
+Dark mode:
+
+![dark mode screeshot](./.github/screenshots/dark.png)
+
 Reader:
 
 ![reader screenshot](./.github/screenshots/reader.png)
@@ -103,3 +145,39 @@ Reader:
 Mobile UI:
 
 ![mobile screenshot](./.github/screenshots/mobile.png)
+
+## Sponsors
+
+<a href="https://casinoshunter.com/online-casinos/"><img src="https://i.imgur.com/EJb3wBo.png" width="150" height="auto"></a>
+<a href="https://www.browserstack.com/open-source"><img src="https://i.imgur.com/hGJUJXD.png" width="150" height="auto"></a>
+
+## Contributors
+
+Please check the [development guideline](https://github.com/hkalexling/Mango/wiki/Development) if you are interested in code contributions.
+<!-- ALL-CONTRIBUTORS-LIST:START - Do not remove or modify this section -->
+<!-- prettier-ignore-start -->
+<!-- markdownlint-disable -->
+<table>
+  <tr>
+    <td align="center"><a href="https://github.com/hkalexling/"><img src="https://avatars1.githubusercontent.com/u/7845831?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Alex Ling</b></sub></a><br /><a href="https://github.com/hkalexling/Mango/commits?author=hkalexling" title="Code">💻</a> <a href="https://github.com/hkalexling/Mango/commits?author=hkalexling" title="Documentation">📖</a> <a href="#infra-hkalexling" title="Infrastructure (Hosting, Build-Tools, etc)">🚇</a></td>
+    <td align="center"><a href="https://github.com/jaredlt"><img src="https://avatars1.githubusercontent.com/u/8590311?v=4?s=100" width="100px;" alt=""/><br /><sub><b>jaredlt</b></sub></a><br /><a href="https://github.com/hkalexling/Mango/commits?author=jaredlt" title="Code">💻</a> <a href="#ideas-jaredlt" title="Ideas, Planning, & Feedback">🤔</a> <a href="#design-jaredlt" title="Design">🎨</a></td>
+    <td align="center"><a href="https://windisco.com/"><img src="https://avatars1.githubusercontent.com/u/4946624?v=4?s=100" width="100px;" alt=""/><br /><sub><b>ココロ</b></sub></a><br /><a href="#infra-shincurry" title="Infrastructure (Hosting, Build-Tools, etc)">🚇</a></td>
+    <td align="center"><a href="https://catgirlsin.space/"><img src="https://avatars0.githubusercontent.com/u/13433513?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Valentijn</b></sub></a><br /><a href="#infra-noirscape" title="Infrastructure (Hosting, Build-Tools, etc)">🚇</a></td>
+    <td align="center"><a href="https://github.com/flying-sausages"><img src="https://avatars1.githubusercontent.com/u/23618693?v=4?s=100" width="100px;" alt=""/><br /><sub><b>flying-sausages</b></sub></a><br /><a href="https://github.com/hkalexling/Mango/commits?author=flying-sausages" title="Documentation">📖</a> <a href="#ideas-flying-sausages" title="Ideas, Planning, & Feedback">🤔</a></td>
+    <td align="center"><a href="https://github.com/XavierSchiller"><img src="https://avatars1.githubusercontent.com/u/22575255?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Xavier</b></sub></a><br /><a href="#infra-XavierSchiller" title="Infrastructure (Hosting, Build-Tools, etc)">🚇</a></td>
+    <td align="center"><a href="https://github.com/WROIATE"><img src="https://avatars3.githubusercontent.com/u/44677306?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Jarao</b></sub></a><br /><a href="#infra-WROIATE" title="Infrastructure (Hosting, Build-Tools, etc)">🚇</a></td>
+  </tr>
+  <tr>
+    <td align="center"><a href="https://github.com/Leeingnyo"><img src="https://avatars0.githubusercontent.com/u/6760150?v=4?s=100" width="100px;" alt=""/><br /><sub><b>이인용</b></sub></a><br /><a href="https://github.com/hkalexling/Mango/commits?author=Leeingnyo" title="Code">💻</a></td>
+    <td align="center"><a href="http://h45h74x.eu.org"><img src="https://avatars1.githubusercontent.com/u/27204033?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Simon</b></sub></a><br /><a href="https://github.com/hkalexling/Mango/commits?author=h45h74x" title="Code">💻</a></td>
+    <td align="center"><a href="https://github.com/davidkna"><img src="https://avatars.githubusercontent.com/u/835177?v=4?s=100" width="100px;" alt=""/><br /><sub><b>David Knaack</b></sub></a><br /><a href="#infra-davidkna" title="Infrastructure (Hosting, Build-Tools, etc)">🚇</a></td>
+    <td align="center"><a href="https://lncn.dev"><img src="https://avatars.githubusercontent.com/u/41193328?v=4?s=100" width="100px;" alt=""/><br /><sub><b>i use arch btw</b></sub></a><br /><a href="#infra-lincolnthedev" title="Infrastructure (Hosting, Build-Tools, etc)">🚇</a></td>
+    <td align="center"><a href="https://github.com/BradleyDS2"><img src="https://avatars.githubusercontent.com/u/2174921?v=4?s=100" width="100px;" alt=""/><br /><sub><b>BradleyDS2</b></sub></a><br /><a href="https://github.com/hkalexling/Mango/commits?author=BradleyDS2" title="Documentation">📖</a></td>
+    <td align="center"><a href="https://github.com/nduja"><img src="https://avatars.githubusercontent.com/u/69299134?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Robbo</b></sub></a><br /><a href="https://github.com/hkalexling/Mango/commits?author=nduja" title="Code">💻</a></td>
+  </tr>
+</table>
+
+<!-- markdownlint-restore -->
+<!-- prettier-ignore-end -->
+
+<!-- ALL-CONTRIBUTORS-LIST:END -->

docker-compose.yml

@@ -7,9 +7,9 @@ services:
       context: .
       dockerfile: ./Dockerfile
     expose:
-      - 9000
+      - ${PORT}
     ports:
-      - 9000:9000
+      - "${PORT}:9000"
     volumes:
-      - ~/mango:/root/mango
-      - ~/.config/mango:/root/.config/mango
+      - ${MAIN_DIRECTORY_PATH}:/root/mango
+      - ${CONFIG_DIRECTORY_PATH}:/root/.config/mango

env.example

@@ -0,0 +1,10 @@
+# Port that exposes the HTTP frontend
+PORT=9000
+
+# Path to the mango main directory
+# This directory holds the database and the library files
+MAIN_DIRECTORY_PATH=
+
+# Path to the mango config directory
+# This directory holds the mango configuration path
+CONFIG_DIRECTORY_PATH=

gulpfile.js

@@ -1,29 +1,74 @@
 const gulp = require('gulp');
-const minify = require("gulp-babel-minify");
+const babel = require('gulp-babel');
+const minify = require('gulp-babel-minify');
 const minifyCss = require('gulp-minify-css');
+const less = require('gulp-less');
 
-gulp.task('minify-js', () => {
-	return gulp.src('public/js/*.js')
+gulp.task('copy-img', () => {
+	return gulp.src('node_modules/uikit/src/images/backgrounds/*.svg')
+		.pipe(gulp.dest('public/img'));
+});
+
+gulp.task('copy-font', () => {
+	return gulp.src('node_modules/@fortawesome/fontawesome-free/webfonts/fa-solid-900.woff**')
+		.pipe(gulp.dest('public/webfonts'));
+});
+
+// Copy files from node_modules
+gulp.task('node-modules-copy', gulp.parallel('copy-img', 'copy-font'));
+
+// Compile less
+gulp.task('less', () => {
+	return gulp.src([
+			'public/css/mango.less',
+			'public/css/tags.less'
+		])
+		.pipe(less())
+		.pipe(gulp.dest('public/css'));
+});
+
+// Transpile and minify JS files and output to dist
+gulp.task('babel', () => {
+	return gulp.src(['public/js/*.js', '!public/js/*.min.js'])
+		.pipe(babel({
+			presets: [
+				['@babel/preset-env', {
+					targets: '>0.25%, not dead, ios>=9'
+				}]
+			],
+		}))
 		.pipe(minify({
-			removeConsole: true
+			removeConsole: true,
+			builtIns: false
 		}))
 		.pipe(gulp.dest('dist/js'));
 });
 
+// Minify CSS and output to dist
 gulp.task('minify-css', () => {
 	return gulp.src('public/css/*.css')
 		.pipe(minifyCss())
 		.pipe(gulp.dest('dist/css'));
 });
 
-gulp.task('img', () => {
-	return gulp.src('public/img/*')
-		.pipe(gulp.dest('dist/img'));
-});
-
-gulp.task('favicon', () => {
-	return gulp.src('public/favicon.ico')
+// Copy static files (includeing images) to dist
+gulp.task('copy-files', () => {
+	return gulp.src([
+			'public/*.*',
+			'public/img/**',
+			'public/webfonts/*',
+			'public/js/*.min.js'
+		], {
+			base: 'public'
+		})
 		.pipe(gulp.dest('dist'));
 });
 
-gulp.task('default', gulp.parallel('minify-js', 'minify-css', 'img', 'favicon'));
+// Set up the public folder for development
+gulp.task('dev', gulp.parallel('node-modules-copy', 'less'));
+
+// Set up the dist folder for deployment
+gulp.task('deploy', gulp.parallel('babel', 'minify-css', 'copy-files'));
+
+// Default task
+gulp.task('default', gulp.series('dev', 'deploy'));

migration/foreign_keys.6.cr

@@ -0,0 +1,85 @@
+class ForeignKeys < MG::Base
+  def up : String
+    <<-SQL
+    -- add foreign key to tags
+    ALTER TABLE tags RENAME TO tmp;
+
+    CREATE TABLE tags (
+      id TEXT NOT NULL,
+      tag TEXT NOT NULL,
+      UNIQUE (id, tag),
+      FOREIGN KEY (id) REFERENCES titles (id)
+        ON UPDATE CASCADE
+        ON DELETE CASCADE
+    );
+
+    INSERT INTO tags
+    SELECT * FROM tmp;
+
+    DROP TABLE tmp;
+
+    CREATE INDEX tags_id_idx ON tags (id);
+    CREATE INDEX tags_tag_idx ON tags (tag);
+
+    -- add foreign key to thumbnails
+    ALTER TABLE thumbnails RENAME TO tmp;
+
+    CREATE TABLE thumbnails (
+      id TEXT NOT NULL,
+      data BLOB NOT NULL,
+      filename TEXT NOT NULL,
+      mime TEXT NOT NULL,
+      size INTEGER NOT NULL,
+      FOREIGN KEY (id) REFERENCES ids (id)
+        ON UPDATE CASCADE
+        ON DELETE CASCADE
+    );
+
+    INSERT INTO thumbnails
+    SELECT * FROM tmp;
+
+    DROP TABLE tmp;
+
+    CREATE UNIQUE INDEX tn_index ON thumbnails (id);
+    SQL
+  end
+
+  def down : String
+    <<-SQL
+    -- remove foreign key from thumbnails
+    ALTER TABLE thumbnails RENAME TO tmp;
+
+    CREATE TABLE thumbnails (
+      id TEXT NOT NULL,
+      data BLOB NOT NULL,
+      filename TEXT NOT NULL,
+      mime TEXT NOT NULL,
+      size INTEGER NOT NULL
+    );
+
+    INSERT INTO thumbnails
+    SELECT * FROM tmp;
+
+    DROP TABLE tmp;
+
+    CREATE UNIQUE INDEX tn_index ON thumbnails (id);
+
+    -- remove foreign key from tags
+    ALTER TABLE tags RENAME TO tmp;
+
+    CREATE TABLE tags (
+      id TEXT NOT NULL,
+      tag TEXT NOT NULL,
+      UNIQUE (id, tag)
+    );
+
+    INSERT INTO tags
+    SELECT * FROM tmp;
+
+    DROP TABLE tmp;
+
+    CREATE INDEX tags_id_idx ON tags (id);
+    CREATE INDEX tags_tag_idx ON tags (tag);
+    SQL
+  end
+end

migration/ids.2.cr

@@ -0,0 +1,19 @@
+class CreateIds < MG::Base
+  def up : String
+    <<-SQL
+    CREATE TABLE IF NOT EXISTS ids (
+      path TEXT NOT NULL,
+      id TEXT NOT NULL,
+      is_title INTEGER NOT NULL
+    );
+    CREATE UNIQUE INDEX IF NOT EXISTS path_idx ON ids (path);
+    CREATE UNIQUE INDEX IF NOT EXISTS id_idx ON ids (id);
+    SQL
+  end
+
+  def down : String
+    <<-SQL
+    DROP TABLE ids;
+    SQL
+  end
+end

migration/ids_signature.7.cr

@@ -0,0 +1,50 @@
+class IDSignature < MG::Base
+  def up : String
+    <<-SQL
+    ALTER TABLE ids ADD COLUMN signature TEXT;
+    SQL
+  end
+
+  def down : String
+    <<-SQL
+    -- remove signature column from ids
+    ALTER TABLE ids RENAME TO tmp;
+
+    CREATE TABLE ids (
+      path TEXT NOT NULL,
+      id TEXT NOT NULL
+    );
+
+    INSERT INTO ids
+    SELECT path, id
+    FROM tmp;
+
+    DROP TABLE tmp;
+
+    -- recreate the indices
+    CREATE UNIQUE INDEX path_idx ON ids (path);
+    CREATE UNIQUE INDEX id_idx ON ids (id);
+
+    -- recreate the foreign key constraint on thumbnails
+    ALTER TABLE thumbnails RENAME TO tmp;
+
+    CREATE TABLE thumbnails (
+      id TEXT NOT NULL,
+      data BLOB NOT NULL,
+      filename TEXT NOT NULL,
+      mime TEXT NOT NULL,
+      size INTEGER NOT NULL,
+      FOREIGN KEY (id) REFERENCES ids (id)
+        ON UPDATE CASCADE
+        ON DELETE CASCADE
+    );
+
+    INSERT INTO thumbnails
+    SELECT * FROM tmp;
+
+    DROP TABLE tmp;
+
+    CREATE UNIQUE INDEX tn_index ON thumbnails (id);
+    SQL
+  end
+end

migration/md_account.11.cr

@@ -0,0 +1,20 @@
+class CreateMangaDexAccount < MG::Base
+  def up : String
+    <<-SQL
+    CREATE TABLE md_account (
+      username TEXT NOT NULL PRIMARY KEY,
+      token TEXT NOT NULL,
+      expire INTEGER NOT NULL,
+      FOREIGN KEY (username) REFERENCES users (username)
+        ON UPDATE CASCADE
+        ON DELETE CASCADE
+    );
+    SQL
+  end
+
+  def down : String
+    <<-SQL
+    DROP TABLE md_account;
+    SQL
+  end
+end

migration/relative_path.8.cr

@@ -0,0 +1,33 @@
+class RelativePath < MG::Base
+  def up : String
+    base = Config.current.library_path
+    # Escape single quotes in case the path contains them, and remove the
+    #   trailing slash (this is a mistake, fixed in DB version 10)
+    base = base.gsub("'", "''").rstrip "/"
+
+    <<-SQL
+    -- update the path column in ids to relative paths
+    UPDATE ids
+    SET path = REPLACE(path, '#{base}', '');
+
+    -- update the path column in titles to relative paths
+    UPDATE titles
+    SET path = REPLACE(path, '#{base}', '');
+    SQL
+  end
+
+  def down : String
+    base = Config.current.library_path
+    base = base.gsub("'", "''").rstrip "/"
+
+    <<-SQL
+    -- update the path column in ids to absolute paths
+    UPDATE ids
+    SET path = '#{base}' || path;
+
+    -- update the path column in titles to absolute paths
+    UPDATE titles
+    SET path = '#{base}' || path;
+    SQL
+  end
+end

migration/relative_path_fix.10.cr

@@ -0,0 +1,31 @@
+# In DB version 8, we replaced the absolute paths in DB with relative paths,
+#   but we mistakenly left the starting slashes. This migration removes them.
+class RelativePathFix < MG::Base
+  def up : String
+    <<-SQL
+    -- remove leading slashes from the paths in ids
+    UPDATE ids
+    SET path = SUBSTR(path, 2, LENGTH(path) - 1)
+    WHERE path LIKE '/%';
+
+    -- remove leading slashes from the paths in titles
+    UPDATE titles
+    SET path = SUBSTR(path, 2, LENGTH(path) - 1)
+    WHERE path LIKE '/%';
+    SQL
+  end
+
+  def down : String
+    <<-SQL
+    -- add leading slashes to paths in ids
+    UPDATE ids
+    SET path = '/' || path
+    WHERE path NOT LIKE '/%';
+
+    -- add leading slashes to paths in titles
+    UPDATE titles
+    SET path = '/' || path
+    WHERE path NOT LIKE '/%';
+    SQL
+  end
+end

migration/sort_title.12.cr

@@ -0,0 +1,94 @@
+class SortTitle < MG::Base
+  def up : String
+    <<-SQL
+    -- add sort_title column to ids and titles
+    ALTER TABLE ids ADD COLUMN sort_title TEXT;
+    ALTER TABLE titles ADD COLUMN sort_title TEXT;
+    SQL
+  end
+
+  def down : String
+    <<-SQL
+    -- remove sort_title column from ids
+    ALTER TABLE ids RENAME TO tmp;
+
+    CREATE TABLE ids (
+      path TEXT NOT NULL,
+      id TEXT NOT NULL,
+      signature TEXT,
+      unavailable INTEGER NOT NULL DEFAULT 0
+    );
+
+    INSERT INTO ids
+    SELECT path, id, signature, unavailable
+    FROM tmp;
+
+    DROP TABLE tmp;
+
+    -- recreate the indices
+    CREATE UNIQUE INDEX path_idx ON ids (path);
+    CREATE UNIQUE INDEX id_idx ON ids (id);
+
+    -- recreate the foreign key constraint on thumbnails
+    ALTER TABLE thumbnails RENAME TO tmp;
+
+    CREATE TABLE thumbnails (
+      id TEXT NOT NULL,
+      data BLOB NOT NULL,
+      filename TEXT NOT NULL,
+      mime TEXT NOT NULL,
+      size INTEGER NOT NULL,
+      FOREIGN KEY (id) REFERENCES ids (id)
+        ON UPDATE CASCADE
+        ON DELETE CASCADE
+    );
+
+    INSERT INTO thumbnails
+    SELECT * FROM tmp;
+
+    DROP TABLE tmp;
+
+    CREATE UNIQUE INDEX tn_index ON thumbnails (id);
+
+    -- remove sort_title column from titles
+    ALTER TABLE titles RENAME TO tmp;
+
+    CREATE TABLE titles (
+      id TEXT NOT NULL,
+      path TEXT NOT NULL,
+      signature TEXT,
+      unavailable INTEGER NOT NULL DEFAULT 0
+    );
+
+    INSERT INTO titles
+    SELECT id, path, signature, unavailable
+    FROM tmp;
+
+    DROP TABLE tmp;
+
+    -- recreate the indices
+    CREATE UNIQUE INDEX titles_id_idx on titles (id);
+    CREATE UNIQUE INDEX titles_path_idx on titles (path);
+
+    -- recreate the foreign key constraint on tags
+    ALTER TABLE tags RENAME TO tmp;
+
+    CREATE TABLE tags (
+      id TEXT NOT NULL,
+      tag TEXT NOT NULL,
+      UNIQUE (id, tag),
+      FOREIGN KEY (id) REFERENCES titles (id)
+        ON UPDATE CASCADE
+        ON DELETE CASCADE
+    );
+
+    INSERT INTO tags
+    SELECT * FROM tmp;
+
+    DROP TABLE tmp;
+
+    CREATE INDEX tags_id_idx ON tags (id);
+    CREATE INDEX tags_tag_idx ON tags (tag);
+    SQL
+  end
+end

migration/tags.4.cr

@@ -0,0 +1,19 @@
+class CreateTags < MG::Base
+  def up : String
+    <<-SQL
+    CREATE TABLE IF NOT EXISTS tags (
+      id TEXT NOT NULL,
+      tag TEXT NOT NULL,
+      UNIQUE (id, tag)
+    );
+    CREATE INDEX IF NOT EXISTS tags_id_idx ON tags (id);
+    CREATE INDEX IF NOT EXISTS tags_tag_idx ON tags (tag);
+    SQL
+  end
+
+  def down : String
+    <<-SQL
+    DROP TABLE tags;
+    SQL
+  end
+end

migration/thumbnails.3.cr

@@ -0,0 +1,20 @@
+class CreateThumbnails < MG::Base
+  def up : String
+    <<-SQL
+    CREATE TABLE IF NOT EXISTS thumbnails (
+      id TEXT NOT NULL,
+      data BLOB NOT NULL,
+      filename TEXT NOT NULL,
+      mime TEXT NOT NULL,
+      size INTEGER NOT NULL
+    );
+    CREATE UNIQUE INDEX IF NOT EXISTS tn_index ON thumbnails (id);
+    SQL
+  end
+
+  def down : String
+    <<-SQL
+    DROP TABLE thumbnails;
+    SQL
+  end
+end

migration/titles.5.cr

@@ -0,0 +1,56 @@
+class CreateTitles < MG::Base
+  def up : String
+    <<-SQL
+    -- create titles
+    CREATE TABLE titles (
+      id TEXT NOT NULL,
+      path TEXT NOT NULL,
+      signature TEXT
+    );
+    CREATE UNIQUE INDEX titles_id_idx on titles (id);
+    CREATE UNIQUE INDEX titles_path_idx on titles (path);
+
+    -- migrate data from ids to titles
+    INSERT INTO titles
+    SELECT id, path, null
+    FROM ids
+    WHERE is_title = 1;
+
+    DELETE FROM ids
+    WHERE is_title = 1;
+
+    -- remove the is_title column from ids
+    ALTER TABLE ids RENAME TO tmp;
+
+    CREATE TABLE ids (
+      path TEXT NOT NULL,
+      id TEXT NOT NULL
+    );
+
+    INSERT INTO ids
+    SELECT path, id
+    FROM tmp;
+
+    DROP TABLE tmp;
+
+    -- recreate the indices
+    CREATE UNIQUE INDEX path_idx ON ids (path);
+    CREATE UNIQUE INDEX id_idx ON ids (id);
+    SQL
+  end
+
+  def down : String
+    <<-SQL
+    -- insert the is_title column
+    ALTER TABLE ids ADD COLUMN is_title INTEGER NOT NULL DEFAULT 0;
+
+    -- migrate data from titles to ids
+    INSERT INTO ids
+    SELECT path, id, 1
+    FROM titles;
+
+    -- remove titles
+    DROP TABLE titles;
+    SQL
+  end
+end

migration/unavailable.9.cr

@@ -0,0 +1,94 @@
+class UnavailableIDs < MG::Base
+  def up : String
+    <<-SQL
+    -- add unavailable column to ids
+    ALTER TABLE ids ADD COLUMN unavailable INTEGER NOT NULL DEFAULT 0;
+
+    -- add unavailable column to titles
+    ALTER TABLE titles ADD COLUMN unavailable INTEGER NOT NULL DEFAULT 0;
+    SQL
+  end
+
+  def down : String
+    <<-SQL
+    -- remove unavailable column from ids
+    ALTER TABLE ids RENAME TO tmp;
+
+    CREATE TABLE ids (
+      path TEXT NOT NULL,
+      id TEXT NOT NULL,
+      signature TEXT
+    );
+
+    INSERT INTO ids
+    SELECT path, id, signature
+    FROM tmp;
+
+    DROP TABLE tmp;
+
+    -- recreate the indices
+    CREATE UNIQUE INDEX path_idx ON ids (path);
+    CREATE UNIQUE INDEX id_idx ON ids (id);
+
+    -- recreate the foreign key constraint on thumbnails
+    ALTER TABLE thumbnails RENAME TO tmp;
+
+    CREATE TABLE thumbnails (
+      id TEXT NOT NULL,
+      data BLOB NOT NULL,
+      filename TEXT NOT NULL,
+      mime TEXT NOT NULL,
+      size INTEGER NOT NULL,
+      FOREIGN KEY (id) REFERENCES ids (id)
+        ON UPDATE CASCADE
+        ON DELETE CASCADE
+    );
+
+    INSERT INTO thumbnails
+    SELECT * FROM tmp;
+
+    DROP TABLE tmp;
+
+    CREATE UNIQUE INDEX tn_index ON thumbnails (id);
+
+    -- remove unavailable column from titles
+    ALTER TABLE titles RENAME TO tmp;
+
+    CREATE TABLE titles (
+      id TEXT NOT NULL,
+      path TEXT NOT NULL,
+      signature TEXT
+    );
+
+    INSERT INTO titles
+    SELECT path, id, signature
+    FROM tmp;
+
+    DROP TABLE tmp;
+
+    -- recreate the indices
+    CREATE UNIQUE INDEX titles_id_idx on titles (id);
+    CREATE UNIQUE INDEX titles_path_idx on titles (path);
+
+    -- recreate the foreign key constraint on tags
+    ALTER TABLE tags RENAME TO tmp;
+
+    CREATE TABLE tags (
+      id TEXT NOT NULL,
+      tag TEXT NOT NULL,
+      UNIQUE (id, tag),
+      FOREIGN KEY (id) REFERENCES titles (id)
+        ON UPDATE CASCADE
+        ON DELETE CASCADE
+    );
+
+    INSERT INTO tags
+    SELECT * FROM tmp;
+
+    DROP TABLE tmp;
+
+    CREATE INDEX tags_id_idx ON tags (id);
+    CREATE INDEX tags_tag_idx ON tags (tag);
+    SQL
+  end
+end

migration/users.1.cr

@@ -0,0 +1,20 @@
+class CreateUsers < MG::Base
+  def up : String
+    <<-SQL
+    CREATE TABLE IF NOT EXISTS users (
+      username TEXT NOT NULL,
+      password TEXT NOT NULL,
+      token TEXT,
+      admin INTEGER NOT NULL
+    );
+    CREATE UNIQUE INDEX IF NOT EXISTS username_idx ON users (username);
+    CREATE UNIQUE INDEX IF NOT EXISTS token_idx ON users (token);
+    SQL
+  end
+
+  def down : String
+    <<-SQL
+    DROP TABLE users;
+    SQL
+  end
+end

package.json

@@ -1,16 +1,25 @@
 {
-  "name": "mango",
-  "version": "1.0.0",
-  "main": "index.js",
-  "repository": "https://github.com/hkalexling/Mango.git",
-  "author": "Alex Ling <hkalexling@gmail.com>",
-  "license": "MIT",
-  "devDependencies": {
-    "gulp": "^4.0.2",
-    "gulp-babel-minify": "^0.5.1",
-    "gulp-minify-css": "^1.2.4"
-  },
-  "scripts": {
-    "uglify": "gulp"
-  }
+	"name": "mango",
+	"version": "1.0.0",
+	"main": "index.js",
+	"repository": "https://github.com/hkalexling/Mango.git",
+	"author": "Alex Ling <hkalexling@gmail.com>",
+	"license": "MIT",
+	"devDependencies": {
+		"@babel/preset-env": "^7.11.5",
+		"all-contributors-cli": "^6.19.0",
+		"gulp": "^4.0.2",
+		"gulp-babel": "^8.0.0",
+		"gulp-babel-minify": "^0.5.1",
+		"gulp-less": "^4.0.1",
+		"gulp-minify-css": "^1.2.4",
+		"less": "^3.11.3"
+	},
+	"scripts": {
+		"uglify": "gulp"
+	},
+	"dependencies": {
+		"@fortawesome/fontawesome-free": "^5.14.0",
+		"uikit": "^3.5.4"
+	}
 }

public/css/mango.css

@@ -1,28 +0,0 @@
-.uk-card-body {
-	padding: 20px;
-}
-.uk-card-media-top {
-	max-height: 350px;
-	overflow: hidden;
-}
-.acard:hover {
-	text-decoration: none;
-}
-.uk-list li {
-	cursor: pointer;
-}
-.reader-bg {
-	background-color: black;
-}
-#scan-status {
-	cursor: auto;
-}
-.uk-card-title {
-	word-wrap: break-word;
-}
-.uk-logo > img {
-	max-height: 90px;
-}
-.uk-search {
-	width: 100%;
-}

public/css/mango.less

@@ -0,0 +1,139 @@
+// UIKit
+@import "./uikit.less";
+
+// FontAwesome
+@import "../../node_modules/@fortawesome/fontawesome-free/less/fontawesome.less";
+@import "../../node_modules/@fortawesome/fontawesome-free/less/solid.less";
+
+@font-face {
+  src: url('@{fa-font-path}/fa-solid-900.woff2');
+  src: url('@{fa-font-path}/fa-solid-900.woff2') format('woff2'),
+    url('@{fa-font-path}/fa-solid-900.woff') format('woff');
+}
+
+// Item cards
+.item .uk-card {
+    cursor: pointer;
+	.uk-card-media-top {
+		width: 100%;
+		height: 250px;
+		@media (min-width: 600px) {
+			height: 300px;
+		}
+
+		img {
+			height: 100%;
+			width: 100%;
+			object-fit: cover;
+
+			&.grayscale {
+				filter: grayscale(100%);
+			}
+		}
+	}
+	.uk-card-body {
+		padding: 20px;
+		.uk-card-title {
+			font-size: 1rem;
+		}
+		.uk-card-title:not(.free-height) {
+			max-height: 3em;
+		}
+	}
+}
+
+// jQuery selectable
+#selectable {
+	.ui-selecting {
+		background: #EEE6B9;
+	}
+	.ui-selected {
+		background: #F4E487;
+	}
+	.uk-light & {
+		.ui-selecting {
+			background: #5E5731;
+		}
+		.ui-selected {
+			background: #9D9252;
+		}
+	}
+}
+
+// Edit modal
+#edit-modal {
+	.uk-grid > div {
+		height: 300px;
+	}
+	#cover {
+		height: 100%;
+		width: 100%;
+		object-fit: cover;
+	}
+	#cover-upload {
+		height: 100%;
+		box-sizing: border-box;
+	}
+	.uk-modal-body .uk-inline {
+		width: 100%;
+	}
+}
+
+// Dark theme
+.uk-light {
+	.uk-modal-header,
+	.uk-modal-body,
+	.uk-modal-footer {
+		background: #222;
+	}
+	.uk-navbar-dropdown,
+	.uk-dropdown {
+		color: #ccc;
+		background: #333;
+	}
+	.uk-nav-header,
+	.uk-description-list > dt {
+		color: #555;
+	}
+}
+
+// Alpine magic
+[x-cloak] {
+    display: none;
+}
+
+// Batch select bar on title page
+#select-bar-controls {
+	a {
+		transform: scale(1.5, 1.5);
+
+		&:hover {
+			color: orange;
+		}
+	}
+}
+
+// Totop button
+#totop-wrapper {
+    position: absolute;
+    top: 100vh;
+    right: 2em;
+    bottom: 0;
+
+	a {
+		position: fixed;
+		position: sticky;
+		top: calc(100vh - 5em);
+	}
+}
+
+// Misc
+.uk-alert-close {
+    color: black !important;
+}
+.break-word {
+    word-wrap: break-word;
+}
+.uk-search {
+    width: 100%;
+}

public/css/tags.less

@@ -0,0 +1,58 @@
+@light-gray: #e5e5e5;
+@gray: #666666;
+@black: #141414;
+@blue: rgb(30, 135, 240);
+@white1: rgba(255, 255, 255, .1);
+@white2: rgba(255, 255, 255, .2);
+@white7: rgba(255, 255, 255, .7);
+
+.select2-container--default {
+	.select2-selection--multiple {
+		border: 1px solid @light-gray;
+		.select2-selection__choice,
+		.select2-selection__choice__remove,
+		.select2-selection__choice__remove:hover
+		{
+			background-color: @blue;
+			color: white;
+			border: none;
+			border-radius: 2px;
+		}
+	}
+	.select2-dropdown {
+		.select2-results__option--highlighted.select2-results__option--selectable {
+			background-color: @blue;
+		}
+		.select2-results__option--selected:not(.select2-results__option--highlighted) {
+			background-color: @light-gray
+		}
+	}
+}
+
+.uk-light {
+	.select2-container--default {
+		.select2-selection {
+			background-color: @white1;
+		}
+		.select2-selection--multiple {
+			border: 1px solid @white2;
+			.select2-selection__choice,
+			.select2-selection__choice__remove,
+			.select2-selection__choice__remove:hover
+			{
+				background-color: white;
+				color: @gray;
+				border: none;
+			}
+			.select2-search__field {
+				color: @white7;
+			}
+		}
+	}
+	.select2-dropdown {
+		background-color: @black;
+		.select2-results__option--selected:not(.select2-results__option--highlighted) {
+			background-color: @white2;
+		}
+	}
+}

public/css/uikit.less

@@ -0,0 +1,64 @@
+@import "node_modules/uikit/src/less/uikit.theme.less";
+
+.label {
+    display: inline-block;
+    padding: @label-padding-vertical @label-padding-horizontal;
+    background: @label-background;
+    line-height: @label-line-height;
+    font-size: @label-font-size;
+    color: @label-color;
+    vertical-align: middle;
+    white-space: nowrap;
+    .hook-label;
+}
+
+.label-success {
+    background-color: @label-success-background;
+    color: @label-success-color;
+}
+
+.label-warning {
+    background-color: @label-warning-background;
+    color: @label-warning-color;
+}
+
+.label-danger {
+    background-color: @label-danger-background;
+    color: @label-danger-color;
+}
+
+.label-pending {
+    background-color: @global-secondary-background;
+    color: @global-inverse-color;
+}
+
+@internal-divider-icon-image:                    "../img/divider-icon.svg";
+@internal-form-select-image:                     "../img/form-select.svg";
+@internal-form-datalist-image:                   "../img/form-datalist.svg";
+@internal-form-radio-image:                      "../img/form-radio.svg";
+@internal-form-checkbox-image:                   "../img/form-checkbox.svg";
+@internal-form-checkbox-indeterminate-image:     "../img/form-checkbox-indeterminate.svg";
+@internal-nav-parent-close-image:                "../img/nav-parent-close.svg";
+@internal-nav-parent-open-image:                 "../img/nav-parent-open.svg";
+@internal-list-bullet-image:                     "../img/list-bullet.svg";
+@internal-accordion-open-image:                  "../img/accordion-open.svg";
+@internal-accordion-close-image:                 "../img/accordion-close.svg";
+
+.hook-card-default() {
+	.uk-light & {
+		background: @card-secondary-background;
+		color: @card-secondary-color;
+	}
+}
+
+.hook-card-default-title() {
+	.uk-light & {
+		color: @card-secondary-title-color;
+	}
+}
+
+.hook-card-default-hover() {
+	.uk-light & {
+		background-color: @card-secondary-hover-background;
+	}
+}

public/js/admin.js

@@ -1,25 +1,58 @@
-var scanning = false;
-function scan() {
-	scanning = true;
-	$('#scan-status > div').removeAttr('hidden');
-	$('#scan-status > span').attr('hidden', '');
-	var color = $('#scan').css('color');
-	$('#scan').css('color', 'gray');
-	$.post('/api/admin/scan', function (data) {
-		var ms = data.milliseconds;
-		var titles = data.titles;
-		$('#scan-status > span').text('Scanned ' + titles + ' titles in ' + ms + 'ms');
-		$('#scan-status > span').removeAttr('hidden');
-		$('#scan').css('color', color);
-		$('#scan-status > div').attr('hidden', '');
-		scanning = false;
-	});
-}
-$(function() {
-	$('li').click(function() {
-		url = $(this).attr('data-url');
-		if (url) {
-			$(location).attr('href', url);
-		}
-	});
-});
+const component = () => {
+	return {
+		progress: 1.0,
+		generating: false,
+		scanning: false,
+		scanTitles: 0,
+		scanMs: -1,
+		themeSetting: '',
+
+		init() {
+			this.getProgress();
+			setInterval(() => {
+				this.getProgress();
+			}, 5000);
+
+			const setting = loadThemeSetting();
+			this.themeSetting = setting.charAt(0).toUpperCase() + setting.slice(1);
+		},
+		themeChanged(event) {
+			const newSetting = $(event.currentTarget).val().toLowerCase();
+			saveThemeSetting(newSetting);
+			setTheme();
+		},
+		scan() {
+			if (this.scanning) return;
+			this.scanning = true;
+			this.scanMs = -1;
+			this.scanTitles = 0;
+			$.post(`${base_url}api/admin/scan`)
+				.then(data => {
+					this.scanMs = data.milliseconds;
+					this.scanTitles = data.titles;
+				})
+				.catch(e => {
+					alert('danger', `Failed to trigger a scan. Error: ${e}`);
+				})
+				.always(() => {
+					this.scanning = false;
+				});
+		},
+		generateThumbnails() {
+			if (this.generating) return;
+			this.generating = true;
+			this.progress = 0.0;
+			$.post(`${base_url}api/admin/generate_thumbnails`)
+				.then(() => {
+					this.getProgress()
+				});
+		},
+		getProgress() {
+			$.get(`${base_url}api/admin/thumbnail_progress`)
+				.then(data => {
+					this.progress = data.progress;
+					this.generating = data.progress > 0;
+				});
+		},
+	};
+};

public/js/alert.js

@@ -0,0 +1,6 @@
+const alert = (level, text) => {
+	$('#alert').empty();
+	const html = `<div class="uk-alert-${level}" uk-alert><a class="uk-alert-close" uk-close></a><p>${text}</p></div>`;
+	$('#alert').append(html);
+	$("html, body").animate({ scrollTop: 0 });
+};

public/js/common.js

@@ -0,0 +1,143 @@
+/**
+ * --- Alpine helper functions
+ */
+
+/**
+ * Set an alpine.js property
+ *
+ * @function setProp
+ * @param {string} key - Key of the data property
+ * @param {*} prop - The data property
+ * @param {string} selector - The jQuery selector to the root element
+ */
+const setProp = (key, prop, selector = '#root') => {
+	$(selector).get(0).__x.$data[key] = prop;
+};
+
+/**
+ * Get an alpine.js property
+ *
+ * @function getProp
+ * @param {string} key - Key of the data property
+ * @param {string} selector - The jQuery selector to the root element
+ * @return {*} The data property
+ */
+const getProp = (key, selector = '#root') => {
+	return $(selector).get(0).__x.$data[key];
+};
+
+/**
+ * --- Theme related functions
+ *  	Note: In the comments below we treat "theme" and "theme setting"
+ *  		differently. A theme can have only two values, either "dark" or
+ *  		"light", while a theme setting can have the third value "system".
+ */
+
+/**
+ * Check if the system setting prefers dark theme.
+ * 		from https://flaviocopes.com/javascript-detect-dark-mode/
+ *
+ * @function preferDarkMode
+ * @return {bool}
+ */
+const preferDarkMode = () => {
+	return window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)').matches;
+};
+
+/**
+ * Check whether a given string represents a valid theme setting
+ *
+ * @function validThemeSetting
+ * @param {string} theme - The string representing the theme setting
+ * @return {bool}
+ */
+const validThemeSetting = (theme) => {
+	return ['dark', 'light', 'system'].indexOf(theme) >= 0;
+};
+
+/**
+ * Load theme setting from local storage, or use 'light'
+ *
+ * @function loadThemeSetting
+ * @return {string} A theme setting ('dark', 'light', or 'system')
+ */
+const loadThemeSetting = () => {
+	let str = localStorage.getItem('theme');
+	if (!str || !validThemeSetting(str)) str = 'system';
+	return str;
+};
+
+/**
+ * Load the current theme (not theme setting)
+ *
+ * @function loadTheme
+ * @return {string} The current theme to use ('dark' or 'light')
+ */
+const loadTheme = () => {
+	let setting = loadThemeSetting();
+	if (setting === 'system') {
+		setting = preferDarkMode() ? 'dark' : 'light';
+	}
+	return setting;
+};
+
+/**
+ * Save a theme setting
+ *
+ * @function saveThemeSetting
+ * @param {string} setting - A theme setting
+ */
+const saveThemeSetting = setting => {
+	if (!validThemeSetting(setting)) setting = 'system';
+	localStorage.setItem('theme', setting);
+};
+
+/**
+ * Toggle the current theme. When the current theme setting is 'system', it
+ *		will be changed to either 'light' or 'dark'
+ *
+ * @function toggleTheme
+ */
+const toggleTheme = () => {
+	const theme = loadTheme();
+	const newTheme = theme === 'dark' ? 'light' : 'dark';
+	saveThemeSetting(newTheme);
+	setTheme(newTheme);
+};
+
+/**
+ * Apply a theme, or load a theme and then apply it
+ *
+ * @function setTheme
+ * @param {string?} theme - (Optional) The theme to apply. When omitted, use
+ * 		`loadTheme` to get a theme and apply it.
+ */
+const setTheme = (theme) => {
+	if (!theme) theme = loadTheme();
+	if (theme === 'dark') {
+		$('html').css('background', 'rgb(20, 20, 20)');
+		$('body').addClass('uk-light');
+		$('.ui-widget-content').addClass('dark');
+	} else {
+		$('html').css('background', '');
+		$('body').removeClass('uk-light');
+		$('.ui-widget-content').removeClass('dark');
+	}
+};
+
+// do it before document is ready to prevent the initial flash of white on
+// 	most pages
+setTheme();
+$(() => {
+	// hack for the reader page
+	setTheme();
+
+	// on system dark mode setting change
+	if (window.matchMedia) {
+		window.matchMedia('(prefers-color-scheme: dark)')
+			.addEventListener('change', event => {
+				if (loadThemeSetting() === 'system')
+					setTheme(event.matches ? 'dark' : 'light');
+			});
+	}
+});

public/js/dots.js

@@ -0,0 +1,26 @@
+/**
+ * Truncate a .uk-card-title element
+ *
+ * @function truncate
+ * @param {object} e - The title element to truncate
+ */
+const truncate = (e) => {
+	$(e).dotdotdot({
+		truncate: 'letter',
+		watch: true,
+		callback: (truncated) => {
+			if (truncated) {
+				$(e).attr('uk-tooltip', $(e).attr('data-title'));
+			} else {
+				$(e).removeAttr('uk-tooltip');
+			}
+		}
+	});
+};
+
+$('.uk-card-title').each((i, e) => {
+	// Truncate the title when it first enters the view
+	$(e).one('inview', () => {
+		truncate(e);
+	});
+});

public/js/download-manager.js

@@ -0,0 +1,116 @@
+const component = () => {
+	return {
+		jobs: [],
+		paused: undefined,
+		loading: false,
+		toggling: false,
+		ws: undefined,
+
+		wsConnect(secure = true) {
+			const url = `${secure ? 'wss' : 'ws'}://${location.host}${base_url}api/admin/mangadex/queue`;
+			console.log(`Connecting to ${url}`);
+			this.ws = new WebSocket(url);
+			this.ws.onmessage = event => {
+				const data = JSON.parse(event.data);
+				this.jobs = data.jobs;
+				this.paused = data.paused;
+			};
+			this.ws.onclose = () => {
+				if (this.ws.failed)
+					return this.wsConnect(false);
+				alert('danger', 'Socket connection closed');
+			};
+			this.ws.onerror = () => {
+				if (secure)
+					return this.ws.failed = true;
+				alert('danger', 'Socket connection failed');
+			};
+		},
+		init() {
+			this.wsConnect();
+			this.load();
+		},
+		load() {
+			this.loading = true;
+			$.ajax({
+					type: 'GET',
+					url: base_url + 'api/admin/mangadex/queue',
+					dataType: 'json'
+				})
+				.done(data => {
+					if (!data.success && data.error) {
+						alert('danger', `Failed to fetch download queue. Error: ${data.error}`);
+						return;
+					}
+					this.jobs = data.jobs;
+					this.paused = data.paused;
+				})
+				.fail((jqXHR, status) => {
+					alert('danger', `Failed to fetch download queue. Error: [${jqXHR.status}] ${jqXHR.statusText}`);
+				})
+				.always(() => {
+					this.loading = false;
+				});
+		},
+		jobAction(action, event) {
+			let url = `${base_url}api/admin/mangadex/queue/${action}`;
+			if (event) {
+				const id = event.currentTarget.closest('tr').id.split('-').slice(1).join('-');
+				url = `${url}?${$.param({
+					id: id
+				})}`;
+			}
+			console.log(url);
+			$.ajax({
+					type: 'POST',
+					url: url,
+					dataType: 'json'
+				})
+				.done(data => {
+					if (!data.success && data.error) {
+						alert('danger', `Failed to ${action} job from download queue. Error: ${data.error}`);
+						return;
+					}
+					this.load();
+				})
+				.fail((jqXHR, status) => {
+					alert('danger', `Failed to ${action} job from download queue. Error: [${jqXHR.status}] ${jqXHR.statusText}`);
+				});
+		},
+		toggle() {
+			this.toggling = true;
+			const action = this.paused ? 'resume' : 'pause';
+			const url = `${base_url}api/admin/mangadex/queue/${action}`;
+			$.ajax({
+					type: 'POST',
+					url: url,
+					dataType: 'json'
+				})
+				.fail((jqXHR, status) => {
+					alert('danger', `Failed to ${action} download queue. Error: [${jqXHR.status}] ${jqXHR.statusText}`);
+				})
+				.always(() => {
+					this.load();
+					this.toggling = false;
+				});
+		},
+		statusClass(status) {
+			let cls = 'label ';
+			switch (status) {
+				case 'Pending':
+					cls += 'label-pending';
+					break;
+				case 'Completed':
+					cls += 'label-success';
+					break;
+				case 'Error':
+					cls += 'label-danger';
+					break;
+				case 'MissingPages':
+					cls += 'label-warning';
+					break;
+			}
+			return cls;
+		}
+	};
+};

public/js/missing-items.js

@@ -0,0 +1,60 @@
+const component = () => {
+	return {
+		empty: true,
+		titles: [],
+		entries: [],
+		loading: true,
+
+		load() {
+			this.loading = true;
+			this.request('GET', `${base_url}api/admin/titles/missing`, data => {
+				this.titles = data.titles;
+				this.request('GET', `${base_url}api/admin/entries/missing`, data => {
+					this.entries = data.entries;
+					this.loading = false;
+					this.empty = this.entries.length === 0 && this.titles.length === 0;
+				});
+			});
+		},
+		rm(event) {
+			const rawID = event.currentTarget.closest('tr').id;
+			const [type, id] = rawID.split('-');
+			const url = `${base_url}api/admin/${type === 'title' ? 'titles' : 'entries'}/missing/${id}`;
+			this.request('DELETE', url, () => {
+				this.load();
+			});
+		},
+		rmAll() {
+			UIkit.modal.confirm('Are you sure? All metadata associated with these items, including their tags and thumbnails, will be deleted from the database.', {
+				labels: {
+					ok: 'Yes, delete them',
+					cancel: 'Cancel'
+				}
+			}).then(() => {
+				this.request('DELETE', `${base_url}api/admin/titles/missing`, () => {
+					this.request('DELETE', `${base_url}api/admin/entries/missing`, () => {
+						this.load();
+					});
+				});
+			});
+		},
+		request(method, url, cb) {
+			console.log(url);
+			$.ajax({
+					type: method,
+					url: url,
+					contentType: 'application/json'
+				})
+				.done(data => {
+					if (data.error) {
+						alert('danger', `Failed to ${method} ${url}. Error: ${data.error}`);
+						return;
+					}
+					if (cb) cb(data);
+				})
+				.fail((jqXHR, status) => {
+					alert('danger', `Failed to ${method} ${url}. Error: [${jqXHR.status}] ${jqXHR.statusText}`);
+				});
+		}
+	};
+};

public/js/plugin-download.js

@@ -0,0 +1,446 @@
+const component = () => {
+	return {
+		plugins: [],
+		info: undefined,
+		pid: undefined,
+		chapters: undefined, // undefined: not searched yet, []: empty
+		manga: undefined, // undefined: not searched yet, []: empty
+		mid: undefined, // id of the selected manga
+		allChapters: [],
+		query: "",
+		mangaTitle: "",
+		searching: false,
+		adding: false,
+		sortOptions: [],
+		showFilters: false,
+		appliedFilters: [],
+		chaptersLimit: 500,
+		listManga: false,
+		subscribing: false,
+		subscriptionName: "",
+
+		init() {
+			const tableObserver = new MutationObserver(() => {
+				console.log("table mutated");
+				$("#selectable").selectable({
+					filter: "tr",
+				});
+			});
+			tableObserver.observe($("table").get(0), {
+				childList: true,
+				subtree: true,
+			});
+			fetch(`${base_url}api/admin/plugin`)
+				.then((res) => res.json())
+				.then((data) => {
+					if (!data.success) throw new Error(data.error);
+					this.plugins = data.plugins;
+
+					const pid = localStorage.getItem("plugin");
+					if (pid && this.plugins.map((p) => p.id).includes(pid))
+						return this.loadPlugin(pid);
+
+					if (this.plugins.length > 0)
+						this.loadPlugin(this.plugins[0].id);
+				})
+				.catch((e) => {
+					alert(
+						"danger",
+						`Failed to list the available plugins. Error: ${e}`
+					);
+				});
+		},
+		loadPlugin(pid) {
+			fetch(
+				`${base_url}api/admin/plugin/info?${new URLSearchParams({
+					plugin: pid,
+				})}`
+			)
+				.then((res) => res.json())
+				.then((data) => {
+					if (!data.success) throw new Error(data.error);
+					this.info = data.info;
+					this.pid = pid;
+				})
+				.catch((e) => {
+					alert(
+						"danger",
+						`Failed to get plugin metadata. Error: ${e}`
+					);
+				});
+		},
+		pluginChanged() {
+			this.loadPlugin(this.pid);
+			localStorage.setItem("plugin", this.pid);
+		},
+		get chapterKeys() {
+			if (this.allChapters.length < 1) return [];
+			return Object.keys(this.allChapters[0]).filter(
+				(k) => !["manga_title"].includes(k)
+			);
+		},
+		searchChapters(query) {
+			this.searching = true;
+			this.allChapters = [];
+			this.sortOptions = [];
+			this.chapters = undefined;
+			this.listManga = false;
+			fetch(
+				`${base_url}api/admin/plugin/list?${new URLSearchParams({
+					plugin: this.pid,
+					query: query,
+				})}`
+			)
+				.then((res) => res.json())
+				.then((data) => {
+					if (!data.success) throw new Error(data.error);
+					try {
+						this.mangaTitle = data.chapters[0].manga_title;
+						if (!this.mangaTitle) throw new Error();
+					} catch (e) {
+						this.mangaTitle = data.title;
+					}
+
+					this.allChapters = data.chapters;
+					this.chapters = data.chapters;
+				})
+				.catch((e) => {
+					alert("danger", `Failed to list chapters. Error: ${e}`);
+				})
+				.finally(() => {
+					this.searching = false;
+				});
+		},
+		searchManga(query) {
+			this.searching = true;
+			this.allChapters = [];
+			this.chapters = undefined;
+			this.manga = undefined;
+			fetch(
+				`${base_url}api/admin/plugin/search?${new URLSearchParams({
+					plugin: this.pid,
+					query: query,
+				})}`
+			)
+				.then((res) => res.json())
+				.then((data) => {
+					if (!data.success) throw new Error(data.error);
+					this.manga = data.manga;
+					this.listManga = true;
+				})
+				.catch((e) => {
+					alert("danger", `Search failed. Error: ${e}`);
+				})
+				.finally(() => {
+					this.searching = false;
+				});
+		},
+		search() {
+			const query = this.query.trim();
+			if (!query) return;
+
+			this.manga = undefined;
+			if (this.info.version === 1) {
+				this.searchChapters(query);
+			} else {
+				this.searchManga(query);
+			}
+		},
+		selectAll() {
+			$("tbody > tr").each((i, e) => {
+				$(e).addClass("ui-selected");
+			});
+		},
+		clearSelection() {
+			$("tbody > tr").each((i, e) => {
+				$(e).removeClass("ui-selected");
+			});
+		},
+		download() {
+			const selected = $("tbody > tr.ui-selected").get();
+			if (selected.length === 0) return;
+
+			UIkit.modal
+				.confirm(`Download ${selected.length} selected chapters?`)
+				.then(() => {
+					const ids = selected.map((e) => e.id);
+					const chapters = this.chapters.filter((c) =>
+						ids.includes(c.id)
+					);
+					console.log(chapters);
+					this.adding = true;
+					fetch(`${base_url}api/admin/plugin/download`, {
+						method: "POST",
+						body: JSON.stringify({
+							chapters,
+							plugin: this.pid,
+							title: this.mangaTitle,
+						}),
+						headers: {
+							"Content-Type": "application/json",
+						},
+					})
+						.then((res) => res.json())
+						.then((data) => {
+							if (!data.success) throw new Error(data.error);
+							const successCount = parseInt(data.success);
+							const failCount = parseInt(data.fail);
+							alert(
+								"success",
+								`${successCount} of ${
+									successCount + failCount
+								} chapters added to the download queue. You can view and manage your download queue on the <a href="${base_url}admin/downloads">download manager page</a>.`
+							);
+						})
+						.catch((e) => {
+							alert(
+								"danger",
+								`Failed to add chapters to the download queue. Error: ${e}`
+							);
+						})
+						.finally(() => {
+							this.adding = false;
+						});
+				});
+		},
+		thClicked(event) {
+			const idx = parseInt(event.currentTarget.id.split("-")[1]);
+			if (idx === undefined || isNaN(idx)) return;
+			const curOption = this.sortOptions[idx];
+			let option;
+			this.sortOptions = [];
+			switch (curOption) {
+				case 1:
+					option = -1;
+					break;
+				case -1:
+					option = 0;
+					break;
+				default:
+					option = 1;
+			}
+			this.sortOptions[idx] = option;
+			this.sort(this.chapterKeys[idx], option);
+		},
+		// Returns an array of filtered but unsorted chapters. Useful when
+		// 	reseting the sort options.
+		get filteredChapters() {
+			let ary = this.allChapters.slice();
+
+			console.log("initial size:", ary.length);
+			for (let filter of this.appliedFilters) {
+				if (!filter.value) continue;
+				if (filter.type === "array" && filter.value === "all") continue;
+				if (filter.type.startsWith("number") && isNaN(filter.value))
+					continue;
+
+				if (filter.type === "string") {
+					ary = ary.filter((ch) =>
+						ch[filter.key]
+							.toLowerCase()
+							.includes(filter.value.toLowerCase())
+					);
+				}
+				if (filter.type === "number-min") {
+					ary = ary.filter(
+						(ch) => Number(ch[filter.key]) >= Number(filter.value)
+					);
+				}
+				if (filter.type === "number-max") {
+					ary = ary.filter(
+						(ch) => Number(ch[filter.key]) <= Number(filter.value)
+					);
+				}
+				if (filter.type === "date-min") {
+					ary = ary.filter(
+						(ch) => Number(ch[filter.key]) >= Number(filter.value)
+					);
+				}
+				if (filter.type === "date-max") {
+					ary = ary.filter(
+						(ch) => Number(ch[filter.key]) <= Number(filter.value)
+					);
+				}
+				if (filter.type === "array") {
+					ary = ary.filter((ch) =>
+						ch[filter.key]
+							.map((s) =>
+								typeof s === "string" ? s.toLowerCase() : s
+							)
+							.includes(filter.value.toLowerCase())
+					);
+				}
+
+				console.log("filtered size:", ary.length);
+			}
+
+			return ary;
+		},
+		// option:
+		// 	- 1: asending
+		// 	- -1: desending
+		// 	- 0: unsorted
+		sort(key, option) {
+			if (option === 0) {
+				this.chapters = this.filteredChapters;
+				return;
+			}
+
+			this.chapters = this.filteredChapters.sort((a, b) => {
+				const comp = this.compare(a[key], b[key]);
+				return option < 0 ? comp * -1 : comp;
+			});
+		},
+		compare(a, b) {
+			if (a === b) return 0;
+
+			// try numbers (also covers dates)
+			if (!isNaN(a) && !isNaN(b)) return Number(a) - Number(b);
+
+			const preprocessString = (val) => {
+				if (typeof val !== "string") return val;
+				return val.toLowerCase().replace(/\s\s/g, " ").trim();
+			};
+
+			return preprocessString(a) > preprocessString(b) ? 1 : -1;
+		},
+		fieldType(values) {
+			if (values.every((v) => this.numIsDate(v))) return "date";
+			if (values.every((v) => !isNaN(v))) return "number";
+			if (values.every((v) => Array.isArray(v))) return "array";
+			return "string";
+		},
+		get filters() {
+			if (this.allChapters.length < 1) return [];
+			const keys = Object.keys(this.allChapters[0]).filter(
+				(k) => !["manga_title", "id"].includes(k)
+			);
+			return keys.map((k) => {
+				let values = this.allChapters.map((c) => c[k]);
+				const type = this.fieldType(values);
+
+				if (type === "array") {
+					// if the type is an array, return the list of available elements
+					// example: an array of groups or authors
+					values = Array.from(
+						new Set(
+							values.flat().map((v) => {
+								if (typeof v === "string")
+									return v.toLowerCase();
+							})
+						)
+					);
+				}
+
+				return {
+					key: k,
+					type: type,
+					values: values,
+				};
+			});
+		},
+		get filterSettings() {
+			return $("#filter-form input:visible, #filter-form select:visible")
+				.get()
+				.map((i) => {
+					const type = i.getAttribute("data-filter-type");
+					let value = i.value.trim();
+					if (type.startsWith("date"))
+						value = value ? Date.parse(value).toString() : "";
+					return {
+						key: i.getAttribute("data-filter-key"),
+						value: value,
+						type: type,
+					};
+				});
+		},
+		applyFilters() {
+			this.appliedFilters = this.filterSettings;
+			this.chapters = this.filteredChapters;
+			this.sortOptions = [];
+		},
+		clearFilters() {
+			$("#filter-form input")
+				.get()
+				.forEach((i) => (i.value = ""));
+			$("#filter-form select").val("all");
+			this.appliedFilters = [];
+			this.chapters = this.filteredChapters;
+			this.sortOptions = [];
+		},
+		mangaSelected(event) {
+			const mid = event.currentTarget.getAttribute("data-id");
+			this.mid = mid;
+			this.searchChapters(mid);
+		},
+		subscribe(modal) {
+			this.subscribing = true;
+			fetch(`${base_url}api/admin/plugin/subscriptions`, {
+				method: "POST",
+				body: JSON.stringify({
+					filters: this.filterSettings,
+					plugin: this.pid,
+					name: this.subscriptionName.trim(),
+					manga: this.mangaTitle,
+					manga_id: this.mid,
+				}),
+				headers: {
+					"Content-Type": "application/json",
+				},
+			})
+				.then((res) => res.json())
+				.then((data) => {
+					if (!data.success) throw new Error(data.error);
+					alert("success", "Subscription created");
+				})
+				.catch((e) => {
+					alert("danger", `Failed to subscribe. Error: ${e}`);
+				})
+				.finally(() => {
+					this.subscribing = false;
+					UIkit.modal(modal).hide();
+				});
+		},
+		numIsDate(num) {
+			return !isNaN(num) && Number(num) > 328896000000; // 328896000000 => 1 Jan, 1980
+		},
+		renderCell(value) {
+			if (this.numIsDate(value))
+				return `<span>${moment(Number(value)).format(
+					"MMM D, YYYY"
+				)}</span>`;
+			const maxLength = 40;
+			if (value && value.length > maxLength)
+				return `<span>${value.substr(
+					0,
+					maxLength
+				)}...</span><div uk-dropdown>${value}</div>`;
+			return `<span>${value}</span>`;
+		},
+		renderFilterRow(ft) {
+			const key = ft.key;
+			let type = ft.type;
+			switch (type) {
+				case "number-min":
+					type = "number (minimum value)";
+					break;
+				case "number-max":
+					type = "number (maximum value)";
+					break;
+				case "date-min":
+					type = "minimum date";
+					break;
+				case "date-max":
+					type = "maximum date";
+					break;
+			}
+			let value = ft.value;
+
+			if (ft.type.startsWith("number") && isNaN(value)) value = "";
+			else if (ft.type.startsWith("date") && value)
+				value = moment(Number(value)).format("MMM D, YYYY");
+
+			return `<td>${key}</td><td>${type}</td><td>${value}</td>`;
+		},
+	};
+};

public/js/reader.js

@@ -1,77 +1,336 @@
-$(function() {
-	function bind() {
-		var controller = new ScrollMagic.Controller();
+const readerComponent = () => {
+	return {
+		loading: true,
+		mode: 'continuous', // Can be 'continuous', 'height' or 'width'
+		msg: 'Loading the web reader. Please wait...',
+		alertClass: 'uk-alert-primary',
+		items: [],
+		curItem: {},
+		enableFlipAnimation: true,
+		flipAnimation: null,
+		longPages: false,
+		lastSavedPage: page,
+		selectedIndex: 0, // 0: not selected; 1: the first page
+		margin: 30,
+		preloadLookahead: 3,
+		enableRightToLeft: false,
 
-		// replace history on scroll
-		$('img').each(function(idx){
-			var scene = new ScrollMagic.Scene({
-				triggerElement: $(this).get(),
-				triggerHook: 'onEnter',
-				reverse: true
-			})
-				.addTo(controller)
-				.on('enter', function(event){
-					current = $(event.target.triggerElement()).attr('id');
-					replaceHistory(current);
+		/**
+		 * Initialize the component by fetching the page dimensions
+		 */
+		init(nextTick) {
+			$.get(`${base_url}api/dimensions/${tid}/${eid}`)
+				.then(data => {
+					if (!data.success && data.error)
+						throw new Error(resp.error);
+					const dimensions = data.dimensions;
+
+					this.items = dimensions.map((d, i) => {
+						return {
+							id: i + 1,
+							url: `${base_url}api/page/${tid}/${eid}/${i+1}`,
+							width: d.width,
+							height: d.height,
+						};
+					});
+
+					const avgRatio = this.items.reduce((acc, cur) => {
+						return acc + cur.height / cur.width
+					}, 0) / this.items.length;
+
+					console.log(avgRatio);
+					this.longPages = avgRatio > 2;
+					this.loading = false;
+					this.mode = localStorage.getItem('mode') || 'continuous';
+
+					// Here we save a copy of this.mode, and use the copy as
+					// 	the model-select value. This is because `updateMode`
+					// 	might change this.mode and make it `height` or `width`,
+					// 	which are not available in mode-select
+					const mode = this.mode;
+					this.updateMode(this.mode, page, nextTick);
+					$('#mode-select').val(mode);
+
+					const savedMargin = localStorage.getItem('margin');
+					if (savedMargin) {
+						this.margin = savedMargin;
+					}
+
+					// Preload Images
+					this.preloadLookahead = +(localStorage.getItem('preloadLookahead') ?? 3);
+					const limit = Math.min(page + this.preloadLookahead, this.items.length + 1);
+					for (let idx = page + 1; idx <= limit; idx++) {
+						this.preloadImage(this.items[idx - 1].url);
+					}
+
+					const savedFlipAnimation = localStorage.getItem('enableFlipAnimation');
+					this.enableFlipAnimation = savedFlipAnimation === null || savedFlipAnimation === 'true';
+
+					const savedRightToLeft = localStorage.getItem('enableRightToLeft');
+					if (savedRightToLeft === null) {
+						this.enableRightToLeft = false;
+					} else {
+						this.enableRightToLeft = (savedRightToLeft === 'true');
+					}
 				})
-				.on('leave', function(event){
-					var prev = $(event.target.triggerElement()).prev();
-					current = $(prev).attr('id');
-					replaceHistory(current);
-				});
-		});
+				.catch(e => {
+					const errMsg = `Failed to get the page dimensions. ${e}`;
+					console.error(e);
+					this.alertClass = 'uk-alert-danger';
+					this.msg = errMsg;
+				})
+		},
+		/**
+		 * Preload an image, which is expected to be cached
+		 */
+		preloadImage(url) {
+			(new Image()).src = url;
+		},
+		/**
+		 * Handles the `change` event for the page selector
+		 */
+		pageChanged() {
+			const p = parseInt($('#page-select').val());
+			this.toPage(p);
+		},
+		/**
+		 * Handles the `change` event for the mode selector
+		 *
+		 * @param {function} nextTick - Alpine $nextTick magic property
+		 */
+		modeChanged(nextTick) {
+			const mode = $('#mode-select').val();
+			const curIdx = parseInt($('#page-select').val());
 
-		// poor man's infinite scroll
-		var scene = new ScrollMagic.Scene({
-			triggerElement: $('.next-url').get(),
-			triggerHook: 'onEnter',
-			offset: -500
-		})
-			.addTo(controller)
-			.on('enter', function(){
-				var nextURL = $('.next-url').attr('href');
-				$('.next-url').remove();
-				if (!nextURL) {
-					console.log('No .next-url found. Reached end of page');
-					var lastURL = $('img').last().attr('id');
-					// load the reader URL for the last page to update reading progrss to 100%
-					$.get(lastURL);
-					$('#next-btn').removeAttr('hidden');
-					return;
+			this.updateMode(mode, curIdx, nextTick);
+		},
+		/**
+		 * Handles the window `resize` event
+		 */
+		resized() {
+			if (this.mode === 'continuous') return;
+
+			const wideScreen = $(window).width() > $(window).height();
+			this.mode = wideScreen ? 'height' : 'width';
+		},
+		/**
+		 * Handles the window `keydown` event
+		 *
+		 * @param {Event} event - The triggering event
+		 */
+		keyHandler(event) {
+			if (this.mode === 'continuous') return;
+
+			if (event.key === 'ArrowLeft' || event.key === 'k')
+				this.flipPage(false ^ this.enableRightToLeft);
+			if (event.key === 'ArrowRight' || event.key === 'j')
+				this.flipPage(true ^ this.enableRightToLeft);
+		},
+		/**
+		 * Flips to the next or the previous page
+		 *
+		 * @param {bool} isNext - Whether we are going to the next page 
+		 */
+		flipPage(isNext) {
+			const idx = parseInt(this.curItem.id);
+			const newIdx = idx + (isNext ? 1 : -1);
+
+			if (newIdx <= 0 || newIdx > this.items.length) return;
+
+			if (newIdx + this.preloadLookahead < this.items.length + 1) {
+				this.preloadImage(this.items[newIdx + this.preloadLookahead - 1].url);
+			}
+
+			this.toPage(newIdx);
+
+			if (this.enableFlipAnimation) {
+				if (isNext ^ this.enableRightToLeft)
+					this.flipAnimation = 'right';
+				else
+					this.flipAnimation = 'left';
+			}
+
+			setTimeout(() => {
+				this.flipAnimation = null;
+			}, 500);
+
+			this.replaceHistory(newIdx);
+		},
+		/**
+		 * Jumps to a specific page
+		 *
+		 * @param {number} idx - One-based index of the page
+		 */
+		toPage(idx) {
+			if (this.mode === 'continuous') {
+				$(`#${idx}`).get(0).scrollIntoView(true);
+			} else {
+				if (idx >= 1 && idx <= this.items.length) {
+					this.curItem = this.items[idx - 1];
 				}
-				$('#hidden').load(encodeURI(nextURL) + ' .uk-container', function(res, status, xhr){
-					if (status === 'error') console.log(xhr.statusText);
-					if (status === 'success') {
-						console.log(nextURL + ' loaded');
-						// new page loaded to #hidden, we now append it
-						$('.uk-section > .uk-container').append($('#hidden .uk-container').children());
-						$('#hidden').empty();
-						bind();
+			}
+			this.replaceHistory(idx);
+			UIkit.modal($('#modal-sections')).hide();
+		},
+		/**
+		 * Replace the address bar history and save the reading progress if necessary 
+		 *
+		 * @param {number} idx - One-based index of the page
+		 */
+		replaceHistory(idx) {
+			const ary = window.location.pathname.split('/');
+			ary[ary.length - 1] = idx;
+			ary.shift(); // remove leading `/`
+			ary.unshift(window.location.origin);
+			const url = ary.join('/');
+			this.saveProgress(idx);
+			history.replaceState(null, "", url);
+		},
+		/**
+		 * Updates the backend reading progress if:
+		 * 		1) the current page is more than five pages away from the last 
+		 * 			saved page, or
+		 * 		2) the average height/width ratio of the pages is over 2, or
+		 * 		3) the current page is the first page, or
+		 * 		4) the current page is the last page
+		 *
+		 * @param {number} idx - One-based index of the page
+		 * @param {function} cb - Callback
+		 */
+		saveProgress(idx, cb) {
+			idx = parseInt(idx);
+			if (Math.abs(idx - this.lastSavedPage) >= 5 ||
+				this.longPages ||
+				idx === 1 || idx === this.items.length
+			) {
+				this.lastSavedPage = idx;
+				console.log('saving progress', idx);
+
+				const url = `${base_url}api/progress/${tid}/${idx}?${$.param({eid: eid})}`;
+				$.ajax({
+						method: 'PUT',
+						url: url,
+						dataType: 'json'
+					})
+					.done(data => {
+						if (data.error)
+							alert('danger', data.error);
+						if (cb) cb();
+					})
+					.fail((jqXHR, status) => {
+						alert('danger', `Error: [${jqXHR.status}] ${jqXHR.statusText}`);
+					});
+			}
+		},
+		/**
+		 * Updates the reader mode
+		 *
+		 * @param {string} mode - Either `continuous` or `paged`
+		 * @param {number} targetPage - The one-based index of the target page
+		 * @param {function} nextTick - Alpine $nextTick magic property
+		 */
+		updateMode(mode, targetPage, nextTick) {
+			localStorage.setItem('mode', mode);
+
+			// The mode to be put into the `mode` prop. It can't be `screen`
+			let propMode = mode;
+
+			if (mode === 'paged') {
+				const wideScreen = $(window).width() > $(window).height();
+				propMode = wideScreen ? 'height' : 'width';
+			}
+
+			this.mode = propMode;
+
+			if (mode === 'continuous') {
+				nextTick(() => {
+					this.setupScroller();
+				});
+			}
+
+			nextTick(() => {
+				this.toPage(targetPage);
+			});
+		},
+		/**
+		 * Shows the control modal
+		 *
+		 * @param {Event} event - The triggering event
+		 */
+		showControl(event) {
+			const idx = event.currentTarget.id;
+			this.selectedIndex = idx;
+			UIkit.modal($('#modal-sections')).show();
+		},
+		/**
+		 * Redirects to a URL
+		 *
+		 * @param {string} url - The target URL
+		 */
+		redirect(url) {
+			window.location.replace(url);
+		},
+		/**
+		 * Set up the scroll handler that calls `replaceHistory` when an image 
+		 * 	enters the view port
+		 */
+		setupScroller() {
+			if (this.mode !== 'continuous') return;
+			$('img').each((idx, el) => {
+				$(el).on('inview', (event, inView) => {
+					if (inView) {
+						const current = $(event.currentTarget).attr('id');
+
+						this.curItem = this.items[current - 1];
+						this.replaceHistory(current);
 					}
 				});
 			});
-	}
+		},
+		/**
+		 * Marks progress as 100% and jumps to the next entry
+		 *
+		 * @param {string} nextUrl - URL of the next entry
+		 */
+		nextEntry(nextUrl) {
+			this.saveProgress(this.items.length, () => {
+				this.redirect(nextUrl);
+			});
+		},
+		/**
+		 * Exits the reader, and sets the reading progress tp 100%
+		 *
+		 * @param {string} exitUrl - The Exit URL
+		 */
+		exitReader(exitUrl) {
+			this.saveProgress(this.items.length, () => {
+				this.redirect(exitUrl);
+			});
+		},
 
-	bind();
-});
-$('#page-select').change(function(){
-	jumpTo(parseInt($('#page-select').val()));
-});
-function showControl(idx) {
-	$('#page-select').val(idx);
-	UIkit.modal($('#modal-sections')).show();
-}
-function jumpTo(page) {
-	var ary = window.location.pathname.split('/');
-	ary[ary.length - 1] = page;
-	ary.shift(); // remove leading `/`
-	ary.unshift(window.location.origin);
-	window.location.replace(ary.join('/'));
-}
-function replaceHistory(url) {
-	history.replaceState(null, "", url);
-	console.log('reading ' + url);
-}
-function redirect(url) {
-	window.location.replace(url);
+		/**
+		 * Handles the `change` event for the entry selector
+		 */
+		entryChanged() {
+			const id = $('#entry-select').val();
+			this.redirect(`${base_url}reader/${tid}/${id}`);
+		},
+
+		marginChanged() {
+			localStorage.setItem('margin', this.margin);
+			this.toPage(this.selectedIndex);
+		},
+
+		preloadLookaheadChanged() {
+			localStorage.setItem('preloadLookahead', this.preloadLookahead);
+		},
+
+		enableFlipAnimationChanged() {
+			localStorage.setItem('enableFlipAnimation', this.enableFlipAnimation);
+		},
+
+		enableRightToLeftChanged() {
+			localStorage.setItem('enableRightToLeft', this.enableRightToLeft);
+		},
+	};
 }

public/js/sort-items.js

@@ -1,35 +1,15 @@
 $(() => {
-	$('option#name-up').attr('selected', '');
 	$('#sort-select').change(() => {
 		const sort = $('#sort-select').find(':selected').attr('id');
 		const ary = sort.split('-');
 		const by = ary[0];
 		const dir = ary[1];
 
-		const items = $('.item');
-		items.remove();
-
-		items.sort((a, b) => {
-			var res;
-			if (by === 'name')
-				res = $(a).find('.uk-card-title').text() > $(b).find('.uk-card-title').text();
-			else if (by === 'date')
-				res = $(a).attr('data-mtime') > $(b).attr('data-mtime');
-			else {
-				const ap = $(a).attr('data-progress');
-				const bp = $(b).attr('data-progress');
-				if (ap === bp)
-					// if progress is the same, we compare by name
-					res = $(a).find('.uk-card-title').text() > $(b).find('.uk-card-title').text();
-				else
-					res = ap > bp;
-			}
-			if (dir === 'up')
-				return res;
-			else
-				return !res;
-		});
-		var html = '';
-		$('#item-container').append(items);
+		const url = `${location.protocol}//${location.host}${location.pathname}`;
+		const newURL = `${url}?${$.param({
+			sort: by,
+			ascend: dir === 'up' ? 1 : 0
+		})}`;
+		window.location.href = newURL;
 	});
 });

public/js/subscription-manager.js

@@ -0,0 +1,147 @@
+const component = () => {
+	return {
+		subscriptions: [],
+		plugins: [],
+		pid: undefined,
+		subscription: undefined, // selected subscription
+		loading: false,
+
+		init() {
+			fetch(`${base_url}api/admin/plugin`)
+				.then((res) => res.json())
+				.then((data) => {
+					if (!data.success) throw new Error(data.error);
+					this.plugins = data.plugins;
+
+					const pid = localStorage.getItem("plugin");
+					if (pid && this.plugins.map((p) => p.id).includes(pid))
+						this.pid = pid;
+					else if (this.plugins.length > 0)
+						this.pid = this.plugins[0].id;
+
+					this.list(pid);
+				})
+				.catch((e) => {
+					alert(
+						"danger",
+						`Failed to list the available plugins. Error: ${e}`
+					);
+				});
+		},
+		pluginChanged() {
+			localStorage.setItem("plugin", this.pid);
+			this.list(this.pid);
+		},
+		list(pid) {
+			if (!pid) return;
+			fetch(
+				`${base_url}api/admin/plugin/subscriptions?${new URLSearchParams(
+					{
+						plugin: pid,
+					}
+				)}`,
+				{
+					method: "GET",
+				}
+			)
+				.then((response) => response.json())
+				.then((data) => {
+					if (!data.success) throw new Error(data.error);
+					this.subscriptions = data.subscriptions;
+				})
+				.catch((e) => {
+					alert(
+						"danger",
+						`Failed to list subscriptions. Error: ${e}`
+					);
+				});
+		},
+		renderStrCell(str) {
+			const maxLength = 40;
+			if (str.length > maxLength)
+				return `<td><span>${str.substring(
+					0,
+					maxLength
+				)}...</span><div uk-dropdown>${str}</div></td>`;
+			return `<td>${str}</td>`;
+		},
+		renderDateCell(timestamp) {
+			return `<td>${moment
+				.duration(moment.unix(timestamp).diff(moment()))
+				.humanize(true)}</td>`;
+		},
+		selected(event, modal) {
+			const id = event.currentTarget.getAttribute("sid");
+			this.subscription = this.subscriptions.find((s) => s.id === id);
+			UIkit.modal(modal).show();
+		},
+		renderFilterRow(ft) {
+			const key = ft.key;
+			let type = ft.type;
+			switch (type) {
+				case "number-min":
+					type = "number (minimum value)";
+					break;
+				case "number-max":
+					type = "number (maximum value)";
+					break;
+				case "date-min":
+					type = "minimum date";
+					break;
+				case "date-max":
+					type = "maximum date";
+					break;
+			}
+			let value = ft.value;
+
+			if (ft.type.startsWith("number") && isNaN(value)) value = "";
+			else if (ft.type.startsWith("date") && value)
+				value = moment(Number(value)).format("MMM D, YYYY");
+
+			return `<td>${key}</td><td>${type}</td><td>${value}</td>`;
+		},
+		actionHandler(event, type) {
+			const id = $(event.currentTarget).closest("tr").attr("sid");
+			if (type !== 'delete') return this.action(id, type);
+			UIkit.modal.confirm('Are you sure you want to delete the subscription? This cannot be undone.', {
+				labels: {
+					ok: 'Yes, delete it',
+					cancel: 'Cancel'
+				}
+			}).then(() => {
+				this.action(id, type);
+			});
+		},
+		action(id, type) {
+			if (this.loading) return;
+			this.loading = true;
+			fetch(
+				`${base_url}api/admin/plugin/subscriptions${type === 'update' ? '/update' : ''}?${new URLSearchParams(
+					{
+						plugin: this.pid,
+						subscription: id,
+					}
+				)}`,
+				{
+					method: type === 'delete' ? "DELETE" : 'POST'
+				}
+			)
+				.then((response) => response.json())
+				.then((data) => {
+					if (!data.success) throw new Error(data.error);
+					if (type === 'update')
+						alert("success", `Checking updates for subscription ${id}. Check the log for the progress or come back to this page later.`);
+				})
+				.catch((e) => {
+					alert(
+						"danger",
+						`Failed to ${type} subscription. Error: ${e}`
+					);
+				})
+				.finally(() => {
+					this.loading = false;
+					this.list(this.pid);
+				});
+		},
+	};
+};

public/js/subscription.js

@@ -0,0 +1,82 @@
+const component = () => {
+	return {
+		available: undefined,
+		subscriptions: [],
+
+		init() {
+			$.getJSON(`${base_url}api/admin/mangadex/expires`)
+				.done((data) => {
+					if (data.error) {
+						alert('danger', 'Failed to check MangaDex integration status. Error: ' + data.error);
+						return;
+					}
+					this.available = Boolean(data.expires && data.expires > Math.floor(Date.now() / 1000));
+
+					if (this.available) this.getSubscriptions();
+				})
+				.fail((jqXHR, status) => {
+					alert('danger', `Failed to check MangaDex integration status. Error: [${jqXHR.status}] ${jqXHR.statusText}`);
+				})
+		},
+
+		getSubscriptions() {
+			$.getJSON(`${base_url}api/admin/mangadex/subscriptions`)
+				.done(data => {
+					if (data.error) {
+						alert('danger', 'Failed to get subscriptions. Error: ' + data.error);
+						return;
+					}
+					this.subscriptions = data.subscriptions;
+				})
+				.fail((jqXHR, status) => {
+					alert('danger', `Failed to get subscriptions. Error: [${jqXHR.status}] ${jqXHR.statusText}`);
+				})
+		},
+
+		rm(event) {
+			const id = event.currentTarget.parentNode.getAttribute('data-id');
+			$.ajax({
+					type: 'DELETE',
+					url: `${base_url}api/admin/mangadex/subscriptions/${id}`,
+					contentType: 'application/json'
+				})
+				.done(data => {
+					if (data.error) {
+						alert('danger', `Failed to delete subscription. Error: ${data.error}`);
+					}
+					this.getSubscriptions();
+				})
+				.fail((jqXHR, status) => {
+					alert('danger', `Failed to delete subscription. Error: [${jqXHR.status}] ${jqXHR.statusText}`);
+				});
+		},
+
+		check(event) {
+			const id = event.currentTarget.parentNode.getAttribute('data-id');
+			$.ajax({
+					type: 'POST',
+					url: `${base_url}api/admin/mangadex/subscriptions/check/${id}`,
+					contentType: 'application/json'
+				})
+				.done(data => {
+					if (data.error) {
+						alert('danger', `Failed to check subscription. Error: ${data.error}`);
+						return;
+					}
+					alert('success', 'Mango is now checking the subscription for updates. This might take a while, but you can safely leave the page.');
+				})
+				.fail((jqXHR, status) => {
+					alert('danger', `Failed to check subscription. Error: [${jqXHR.status}] ${jqXHR.statusText}`);
+				});
+		},
+
+		formatRange(min, max) {
+			if (!isNaN(min) && isNaN(max)) return `≥ ${min}`;
+			if (isNaN(min) && !isNaN(max)) return `≤ ${max}`;
+			if (isNaN(min) && isNaN(max)) return 'All';
+
+			if (min === max) return `= ${min}`;
+			return `${min} - ${max}`;
+		}
+	};
+};

public/js/title.js

@@ -1,52 +1,392 @@
+$(() => {
+	setupAcard();
+});
+
+const setupAcard = () => {
+	$('.acard.is_entry').click((e) => {
+		if ($(e.target).hasClass('no-modal')) return;
+		const card = $(e.target).closest('.acard');
+
+		showModal(
+			$(card).attr('data-encoded-path'),
+			parseInt($(card).attr('data-pages')),
+			parseFloat($(card).attr('data-progress')),
+			$(card).attr('data-encoded-book-title'),
+			$(card).attr('data-encoded-title'),
+			$(card).attr('data-book-id'),
+			$(card).attr('data-id')
+		);
+	});
+};
+
 function showModal(encodedPath, pages, percentage, encodedeTitle, encodedEntryTitle, titleID, entryID) {
 	const zipPath = decodeURIComponent(encodedPath);
 	const title = decodeURIComponent(encodedeTitle);
 	const entry = decodeURIComponent(encodedEntryTitle);
-	$('#modal button, #modal a').each(function(){
+	$('#modal button, #modal a').each(function() {
 		$(this).removeAttr('hidden');
 	});
 	if (percentage === 0) {
 		$('#continue-btn').attr('hidden', '');
 		$('#unread-btn').attr('hidden', '');
-	}
-	else {
+	} else if (percentage === 100) {
+		$('#read-btn').attr('hidden', '');
+		$('#continue-btn').attr('hidden', '');
+	} else {
 		$('#continue-btn').text('Continue from ' + percentage + '%');
 	}
-	if (percentage === 100) {
-		$('#read-btn').attr('hidden', '');
-	}
-	$('#modal-title').text(title);
+
+	$('#modal-entry-title').find('span').text(entry);
+	$('#modal-entry-title').next().attr('data-id', titleID);
+	$('#modal-entry-title').next().attr('data-entry-id', entryID);
+	$('#modal-entry-title').next().find('.title-rename-field').val(entry);
 	$('#path-text').text(zipPath);
 	$('#pages-text').text(pages + ' pages');
 
-	$('#beginning-btn').attr('href', '/reader/' + titleID + '/' + entryID + '/1');
-	$('#continue-btn').attr('href', '/reader/' + titleID + '/' + entryID);
+	$('#beginning-btn').attr('href', `${base_url}reader/${titleID}/${entryID}/1`);
+	$('#continue-btn').attr('href', `${base_url}reader/${titleID}/${entryID}`);
 
-	$('#read-btn').click(function(){
+	$('#read-btn').click(function() {
 		updateProgress(titleID, entryID, pages);
 	});
-	$('#unread-btn').click(function(){
+	$('#unread-btn').click(function() {
 		updateProgress(titleID, entryID, 0);
 	});
 
+	$('#modal-edit-btn').attr('onclick', `edit("${entryID}")`);
+
+	$('#modal-download-btn').attr('href', `${base_url}api/download/${titleID}/${entryID}`);
+
 	UIkit.modal($('#modal')).show();
 }
-function updateProgress(titleID, entryID, page) {
-	$.post('/api/progress/' + titleID + '/' + entryID + '/' + page, function(data) {
-		if (data.success) {
+
+UIkit.util.on(document, 'hidden', '#modal', () => {
+	$('#read-btn').off('click');
+	$('#unread-btn').off('click');
+});
+
+const updateProgress = (tid, eid, page) => {
+	let url = `${base_url}api/progress/${tid}/${page}`
+	const query = $.param({
+		eid: eid
+	});
+	if (eid)
+		url += `?${query}`;
+
+	$.ajax({
+			method: 'PUT',
+			url: url,
+			dataType: 'json'
+		})
+		.done(data => {
+			if (data.success) {
+				location.reload();
+			} else {
+				error = data.error;
+				alert('danger', error);
+			}
+		})
+		.fail((jqXHR, status) => {
+			alert('danger', `Error: [${jqXHR.status}] ${jqXHR.statusText}`);
+		});
+};
+
+const renameSubmit = (name, eid) => {
+	const upload = $('.upload-field');
+	const titleId = upload.attr('data-title-id');
+
+	if (name.length === 0) {
+		alert('danger', 'The display name should not be empty');
+		return;
+	}
+
+	const query = $.param({
+		eid: eid
+	});
+	let url = `${base_url}api/admin/display_name/${titleId}/${name}`;
+	if (eid)
+		url += `?${query}`;
+
+	$.ajax({
+			type: 'PUT',
+			url: url,
+			contentType: "application/json",
+			dataType: 'json'
+		})
+		.done(data => {
+			if (data.error) {
+				alert('danger', `Failed to update display name. Error: ${data.error}`);
+				return;
+			}
 			location.reload();
-		}
-		else {
-			error = data.error;
-			alert('danger', error);
+		})
+		.fail((jqXHR, status) => {
+			alert('danger', `Failed to update display name. Error: [${jqXHR.status}] ${jqXHR.statusText}`);
+		});
+};
+
+const renameSortNameSubmit = (name, eid) => {
+	const upload = $('.upload-field');
+	const titleId = upload.attr('data-title-id');
+
+	const params = {};
+	if (eid) params.eid = eid;
+	if (name) params.name = name;
+	const query = $.param(params);
+	let url = `${base_url}api/admin/sort_title/${titleId}?${query}`;
+
+	$.ajax({
+			type: 'PUT',
+			url,
+			contentType: 'application/json',
+			dataType: 'json'
+		})
+		.done(data => {
+			if (data.error) {
+				alert('danger', `Failed to update sort title. Error: ${data.error}`);
+				return;
+			}
+			location.reload();
+		})
+		.fail((jqXHR, status) => {
+			alert('danger', `Failed to update sort title. Error: [${jqXHR.status}] ${jqXHR.statusText}`);
+		});
+};
+
+const edit = (eid) => {
+	const cover = $('#edit-modal #cover');
+	let url = cover.attr('data-title-cover');
+	let displayName = $('h2.uk-title > span').text();
+	let fileTitle = $('h2.uk-title').attr('data-file-title');
+	let sortTitle = $('h2.uk-title').attr('data-sort-title');
+
+	if (eid) {
+		const item = $(`#${eid}`);
+		url = item.find('img').attr('data-src');
+		displayName = item.find('.uk-card-title').attr('data-title');
+		fileTitle = item.find('.uk-card-title').attr('data-file-title');
+		sortTitle = item.find('.uk-card-title').attr('data-sort-title');
+		$('#title-progress-control').attr('hidden', '');
+	} else {
+		$('#title-progress-control').removeAttr('hidden');
+	}
+
+	cover.attr('data-src', url);
+
+	const displayNameField = $('#display-name-field');
+	displayNameField.attr('value', displayName);
+	displayNameField.attr('placeholder', fileTitle);
+	displayNameField.keyup(event => {
+		if (event.keyCode === 13) {
+			renameSubmit(displayNameField.val() || fileTitle, eid);
 		}
 	});
-}
-function alert(level, text) {
-	hideAlert();
-	var html = '<div class="uk-alert-' + level + '" uk-alert><a class="uk-alert-close" uk-close></a><p>' + text + '</p></div>';
-	$('#alert').append(html);
-}
-function hideAlert() {
-	$('#alert').empty();
-}
+	displayNameField.siblings('a.uk-form-icon').click(() => {
+		renameSubmit(displayNameField.val() || fileTitle, eid);
+	});
+
+	const sortTitleField = $('#sort-title-field');
+	sortTitleField.val(sortTitle);
+	sortTitleField.attr('placeholder', fileTitle);
+	sortTitleField.keyup(event => {
+		if (event.keyCode === 13) {
+			renameSortNameSubmit(sortTitleField.val(), eid);
+		}
+	});
+	sortTitleField.siblings('a.uk-form-icon').click(() => {
+		renameSortNameSubmit(sortTitleField.val(), eid);
+	});
+
+	setupUpload(eid);
+
+	UIkit.modal($('#edit-modal')).show();
+};
+
+UIkit.util.on(document, 'hidden', '#edit-modal', () => {
+	const displayNameField = $('#display-name-field');
+	displayNameField.off('keyup');
+	displayNameField.off('click');
+
+	const sortTitleField = $('#sort-title-field');
+	sortTitleField.off('keyup');
+	sortTitleField.off('click');
+});
+
+const setupUpload = (eid) => {
+	const upload = $('.upload-field');
+	const bar = $('#upload-progress').get(0);
+	const titleId = upload.attr('data-title-id');
+	const queryObj = {
+		tid: titleId
+	};
+	if (eid)
+		queryObj['eid'] = eid;
+	const query = $.param(queryObj);
+	const url = `${base_url}api/admin/upload/cover?${query}`;
+	UIkit.upload('.upload-field', {
+		url: url,
+		name: 'file',
+		error: (e) => {
+			alert('danger', `Failed to upload cover image: ${e.toString()}`);
+		},
+		loadStart: (e) => {
+			$(bar).removeAttr('hidden');
+			bar.max = e.total;
+			bar.value = e.loaded;
+		},
+		progress: (e) => {
+			bar.max = e.total;
+			bar.value = e.loaded;
+		},
+		loadEnd: (e) => {
+			bar.max = e.total;
+			bar.value = e.loaded;
+		},
+		completeAll: () => {
+			$(bar).attr('hidden', '');
+			location.reload();
+		}
+	});
+};
+
+const deselectAll = () => {
+	$('.item .uk-card').each((i, e) => {
+		const data = e.__x.$data;
+		data['selected'] = false;
+	});
+	$('#select-bar')[0].__x.$data['count'] = 0;
+};
+
+const selectAll = () => {
+	let count = 0;
+	$('.item .uk-card').each((i, e) => {
+		const data = e.__x.$data;
+		if (!data['disabled']) {
+			data['selected'] = true;
+			count++;
+		}
+	});
+	$('#select-bar')[0].__x.$data['count'] = count;
+};
+
+const selectedIDs = () => {
+	const ary = [];
+	$('.item .uk-card').each((i, e) => {
+		const data = e.__x.$data;
+		if (!data['disabled'] && data['selected']) {
+			const item = $(e).closest('.item');
+			ary.push($(item).attr('id'));
+		}
+	});
+	return ary;
+};
+
+const bulkProgress = (action, el) => {
+	const tid = $(el).attr('data-id');
+	const ids = selectedIDs();
+	const url = `${base_url}api/bulk_progress/${action}/${tid}`;
+	$.ajax({
+			type: 'PUT',
+			url: url,
+			contentType: "application/json",
+			dataType: 'json',
+			data: JSON.stringify({
+				ids: ids
+			})
+		})
+		.done(data => {
+			if (data.error) {
+				alert('danger', `Failed to mark entries as ${action}. Error: ${data.error}`);
+				return;
+			}
+			location.reload();
+		})
+		.fail((jqXHR, status) => {
+			alert('danger', `Failed to mark entries as ${action}. Error: [${jqXHR.status}] ${jqXHR.statusText}`);
+		})
+		.always(() => {
+			deselectAll();
+		});
+};
+
+const tagsComponent = () => {
+	return {
+		isAdmin: false,
+		tags: [],
+		tid: $('.upload-field').attr('data-title-id'),
+		loading: true,
+
+		load(admin) {
+			this.isAdmin = admin;
+
+			$('.tag-select').select2({
+				tags: true,
+				placeholder: this.isAdmin ? 'Tag the title' : 'No tags found',
+				disabled: !this.isAdmin,
+				templateSelection(state) {
+					const a = document.createElement('a');
+					a.setAttribute('href', `${base_url}tags/${encodeURIComponent(state.text)}`);
+					a.setAttribute('class', 'uk-link-reset');
+					a.onclick = event => {
+						event.stopPropagation();
+					};
+					a.innerText = state.text;
+					return a;
+				}
+			});
+
+			this.request(`${base_url}api/tags`, 'GET', (data) => {
+				const allTags = data.tags;
+				const url = `${base_url}api/tags/${this.tid}`;
+				this.request(url, 'GET', data => {
+					this.tags = data.tags;
+					allTags.forEach(t => {
+						const op = new Option(t, t, false, this.tags.indexOf(t) >= 0);
+						$('.tag-select').append(op);
+					});
+					$('.tag-select').on('select2:select', e => {
+						this.onAdd(e);
+					});
+					$('.tag-select').on('select2:unselect', e => {
+						this.onDelete(e);
+					});
+					$('.tag-select').on('change', () => {
+						this.onChange();
+					});
+					$('.tag-select').trigger('change');
+					this.loading = false;
+				});
+			});
+		},
+		onChange() {
+			this.tags = $('.tag-select').select2('data').map(o => o.text);
+		},
+		onAdd(event) {
+			const tag = event.params.data.text;
+			const url = `${base_url}api/admin/tags/${this.tid}/${encodeURIComponent(tag)}`;
+			this.request(url, 'PUT');
+		},
+		onDelete(event) {
+			const tag = event.params.data.text;
+			const url = `${base_url}api/admin/tags/${this.tid}/${encodeURIComponent(tag)}`;
+			this.request(url, 'DELETE');
+		},
+		request(url, method, cb) {
+			$.ajax({
+					url: url,
+					method: method,
+					dataType: 'json'
+				})
+				.done(data => {
+					if (data.success) {
+						if (cb) cb(data);
+					} else {
+						alert('danger', data.error);
+					}
+				})
+				.fail((jqXHR, status) => {
+					alert('danger', `Error: [${jqXHR.status}] ${jqXHR.statusText}`);
+				});
+		}
+	};
+};

public/js/user-edit.js

@@ -1,16 +1,6 @@
-$(function(){
-	var target = '/admin/user/edit';
+$(() => {
+	var target = base_url + 'admin/user/edit';
 	if (username) target += username;
 	$('form').attr('action', target);
-
-	function alert(level, text) {
-		hideAlert();
-		var html = '<div class="uk-alert-' + level + '" uk-alert><a class="uk-alert-close" uk-close></a><p>' + text + '</p></div>';
-		$('#alert').append(html);
-	}
-	function hideAlert() {
-		$('#alert').empty();
-	}
-
 	if (error) alert('danger', error);
 });

public/js/user.js

@@ -1,19 +1,16 @@
-function alert(level, text) {
-	hideAlert();
-	var html = '<div class="uk-alert-' + level + '" uk-alert><a class="uk-alert-close" uk-close></a><p>' + text + '</p></div>';
-	$('#alert').append(html);
-}
-function hideAlert() {
-	$('#alert').empty();
-}
-function remove(username) {
-	$.post('/api/admin/user/delete/' + username, function(data) {
-		if (data.success) {
-			location.reload();
-		}
-		else {
-			error = data.error;
-			alert('danger', error);
-		}
-	});
-}
+const remove = (username) => {
+	$.ajax({
+			url: `${base_url}api/admin/user/delete/${username}`,
+			type: 'DELETE',
+			dataType: 'json'
+		})
+		.done(data => {
+			if (data.success)
+				location.reload();
+			else
+				alert('danger', data.error);
+		})
+		.fail((jqXHR, status) => {
+			alert('danger', `Failed to delete the user. Error: [${jqXHR.status}] ${jqXHR.statusText}`);
+		});
+};

public/manifest.json

@@ -0,0 +1,23 @@
+{
+	"name": "Mango",
+	"description": "Mango: A self-hosted manga server and web reader",
+	"icons": [
+		{
+			"src": "/img/icons/icon_x96.png",
+			"sizes": "96x96",
+			"type": "image/png"
+		},
+		{
+			"src": "/img/icons/icon_x192.png",
+			"sizes": "192x192",
+			"type": "image/png"
+		},
+		{
+			"src": "/img/icons/icon_x512.png",
+			"sizes": "512x512",
+			"type": "image/png"
+		}
+	],
+	"display": "fullscreen",
+	"start_url": "/"
+}

public/robots.txt

@@ -0,0 +1,2 @@
+User-agent: *
+Disallow: /

shard.lock

@@ -1,30 +1,82 @@
-version: 1.0
+version: 2.0
 shards:
+  ameba:
+    git: https://github.com/crystal-ameba/ameba.git
+    version: 0.14.3
+
+  archive:
+    git: https://github.com/hkalexling/archive.cr.git
+    version: 0.5.0
+
+  baked_file_system:
+    git: https://github.com/schovi/baked_file_system.git
+    version: 0.10.0
+
+  clim:
+    git: https://github.com/at-grandpa/clim.git
+    version: 0.17.1
+
   db:
-    github: crystal-lang/crystal-db
-    version: 0.8.0
+    git: https://github.com/crystal-lang/crystal-db.git
+    version: 0.10.1
+
+  duktape:
+    git: https://github.com/jessedoyle/duktape.cr.git
+    version: 1.0.0
 
   exception_page:
-    github: crystal-loot/exception_page
-    version: 0.1.2
+    git: https://github.com/crystal-loot/exception_page.git
+    version: 0.1.5
+
+  http_proxy:
+    git: https://github.com/mamantoha/http_proxy.git
+    version: 0.8.0
+
+  image_size:
+    git: https://github.com/hkalexling/image_size.cr.git
+    version: 0.5.0
 
   kemal:
-    github: kemalcr/kemal
-    version: 0.26.1
+    git: https://github.com/kemalcr/kemal.git
+    version: 1.0.0
 
-  kemal-basic-auth:
-    github: kemalcr/kemal-basic-auth
-    version: 0.2.0
+  kemal-session:
+    git: https://github.com/kemalcr/kemal-session.git
+    version: 1.0.0
 
   kilt:
-    github: jeromegn/kilt
-    version: 0.4.0
+    git: https://github.com/jeromegn/kilt.git
+    version: 0.4.1
+
+  koa:
+    git: https://github.com/hkalexling/koa.git
+    version: 0.9.0
+
+  mg:
+    git: https://github.com/hkalexling/mg.git
+    version: 0.5.0+git.commit.697e46e27cde8c3969346e228e372db2455a6264
+
+  myhtml:
+    git: https://github.com/kostya/myhtml.git
+    version: 1.5.8
+
+  open_api:
+    git: https://github.com/hkalexling/open_api.cr.git
+    version: 1.2.1+git.commit.1d3c55dd5534c6b0af18964d031858a08515553a
 
   radix:
-    github: luislavena/radix
-    version: 0.3.9
+    git: https://github.com/luislavena/radix.git
+    version: 0.4.1
+
+  sanitize:
+    git: https://github.com/hkalexling/sanitize.git
+    version: 0.1.0+git.commit.e09520e972d0d9b70b71bb003e6831f7c2c59dce
 
   sqlite3:
-    github: crystal-lang/crystal-sqlite3
-    version: 0.15.0
+    git: https://github.com/crystal-lang/crystal-sqlite3.git
+    version: 0.18.0
+
+  tallboy:
+    git: https://github.com/epoch/tallboy.git
+    version: 0.9.3+git.commit.9be1510bb0391c95e92f1b288f3afb429a73caa6
 

shard.yml

@@ -1,5 +1,5 @@
 name: mango
-version: 0.1.0
+version: 0.25.0
 
 authors:
   - Alex Ling <hkalexling@gmail.com>
@@ -8,14 +8,39 @@ targets:
   mango:
     main: src/mango.cr
 
-crystal: 0.32.1
+crystal: 1.0.0
 
 license: MIT
 
 dependencies:
   kemal:
     github: kemalcr/kemal
+  kemal-session:
+    github: kemalcr/kemal-session
   sqlite3:
     github: crystal-lang/crystal-sqlite3
   baked_file_system:
     github: schovi/baked_file_system
+  archive:
+    github: hkalexling/archive.cr
+  ameba:
+    github: crystal-ameba/ameba
+  clim:
+    github: at-grandpa/clim
+  duktape:
+    github: jessedoyle/duktape.cr
+  myhtml:
+    github: kostya/myhtml
+  http_proxy:
+    github: mamantoha/http_proxy
+  image_size:
+   github: hkalexling/image_size.cr
+  koa:
+    github: hkalexling/koa
+  tallboy:
+    github: epoch/tallboy
+    branch: master
+  mg:
+   github: hkalexling/mg
+  sanitize:
+    github: hkalexling/sanitize

spec/asset/test-config.yml

@@ -0,0 +1,2 @@
+---
+port: 3000

spec/config_spec.cr

@@ -0,0 +1,14 @@
+require "./spec_helper"
+
+describe Config do
+  it "creates config if it does not exist" do
+    with_default_config do |_, path|
+      File.exists?(path).should be_true
+    end
+  end
+
+  it "correctly loads config" do
+    config = Config.load "spec/asset/test-config.yml"
+    config.port.should eq 3000
+  end
+end

spec/rename_spec.cr

@@ -0,0 +1,76 @@
+require "./spec_helper"
+require "../src/rename"
+
+include Rename
+
+describe Rule do
+  it "raises on nested brackets" do
+    expect_raises Exception do
+      Rule.new "[[]]"
+    end
+    expect_raises Exception do
+      Rule.new "{{}}"
+    end
+  end
+
+  it "raises on unclosed brackets" do
+    expect_raises Exception do
+      Rule.new "["
+    end
+    expect_raises Exception do
+      Rule.new "{"
+    end
+    expect_raises Exception do
+      Rule.new "[{]}"
+    end
+  end
+
+  it "raises when closing unopened brackets" do
+    expect_raises Exception do
+      Rule.new "]"
+    end
+    expect_raises Exception do
+      Rule.new "[}"
+    end
+  end
+
+  it "handles `|` in patterns" do
+    rule = Rule.new "{a|b|c}"
+    rule.render({"b" => "b"}).should eq "b"
+    rule.render({"a" => "a", "b" => "b"}).should eq "a"
+  end
+
+  it "raises on escaped characters" do
+    expect_raises Exception do
+      Rule.new "hello/world"
+    end
+  end
+
+  it "handles spaces in patterns" do
+    rule = Rule.new "{  a }"
+    rule.render({"a" => "a"}).should eq "a"
+  end
+
+  it "strips leading and tailing spaces" do
+    rule = Rule.new "  hello "
+    rule.render({"a" => "a"}).should eq "hello"
+  end
+
+  it "renders a few examples correctly" do
+    rule = Rule.new "[Ch. {chapter }] {title | id} testing"
+    rule.render({"id" => "ID"}).should eq "ID testing"
+    rule.render({"chapter" => "CH", "id" => "ID"})
+      .should eq "Ch. CH ID testing"
+    rule.render({} of String => String).should eq "testing"
+  end
+
+  it "escapes illegal characters" do
+    rule = Rule.new "{a}"
+    rule.render({"a" => "/?<>:*|\"^"}).should eq "_________"
+  end
+
+  it "strips trailing spaces and dots" do
+    rule = Rule.new "hello. world. .."
+    rule.render({} of String => String).should eq "hello. world"
+  end
+end

spec/spec_helper.cr

@@ -0,0 +1,56 @@
+require "spec"
+require "../src/queue"
+require "../src/server"
+require "../src/config"
+require "../src/main_fiber"
+
+class State
+  @@hash = {} of String => String
+
+  def self.get(key)
+    @@hash[key]?
+  end
+
+  def self.get!(key)
+    @@hash[key]
+  end
+
+  def self.set(key, value)
+    return if value.nil?
+    @@hash[key] = value
+  end
+
+  def self.reset
+    @@hash.clear
+  end
+end
+
+def get_tempfile(name)
+  path = State.get name
+  if path.nil? || !File.exists? path
+    file = File.tempfile name
+    State.set name, file.path
+    file
+  else
+    File.new path
+  end
+end
+
+def with_default_config
+  temp_config = get_tempfile "mango-test-config"
+  config = Config.load temp_config.path
+  config.set_current
+  yield config, temp_config.path
+  temp_config.delete
+end
+
+def with_storage
+  with_default_config do
+    temp_db = get_tempfile "mango-test-db"
+    storage = Storage.new temp_db.path, false
+    clear = yield storage, temp_db.path
+    if clear == true
+      temp_db.delete
+    end
+  end
+end

spec/storage_spec.cr

@@ -0,0 +1,89 @@
+require "./spec_helper"
+
+describe Storage do
+  it "creates DB at given path" do
+    with_storage do |_, path|
+      File.exists?(path).should be_true
+    end
+  end
+
+  it "deletes user" do
+    with_storage &.delete_user "admin"
+  end
+
+  it "creates new user" do
+    with_storage do |storage|
+      storage.new_user "user", "123456", false
+      storage.new_user "admin", "123456", true
+    end
+  end
+
+  it "verifies username/password combination" do
+    with_storage do |storage|
+      user_token = storage.verify_user "user", "123456"
+      admin_token = storage.verify_user "admin", "123456"
+      user_token.should_not be_nil
+      admin_token.should_not be_nil
+      State.set "user_token", user_token
+      State.set "admin_token", admin_token
+    end
+  end
+
+  it "rejects duplicate username" do
+    with_storage do |storage|
+      expect_raises SQLite3::Exception,
+        "UNIQUE constraint failed: users.username" do
+        storage.new_user "admin", "123456", true
+      end
+    end
+  end
+
+  it "verifies token" do
+    with_storage do |storage|
+      user_token = State.get! "user_token"
+      user = storage.verify_token user_token
+      user.should eq "user"
+    end
+  end
+
+  it "verfies admin token" do
+    with_storage do |storage|
+      admin_token = State.get! "admin_token"
+      storage.verify_admin(admin_token).should be_true
+    end
+  end
+
+  it "rejects non-admin token" do
+    with_storage do |storage|
+      user_token = State.get! "user_token"
+      storage.verify_admin(user_token).should be_false
+    end
+  end
+
+  it "updates user" do
+    with_storage do |storage|
+      storage.update_user "admin", "admin", "654321", true
+      token = storage.verify_user "admin", "654321"
+      admin_token = State.get! "admin_token"
+      token.should eq admin_token
+    end
+  end
+
+  it "logs user out" do
+    with_storage do |storage|
+      user_token = State.get! "user_token"
+      admin_token = State.get! "admin_token"
+      storage.logout user_token
+      storage.logout admin_token
+      storage.verify_token(user_token).should be_nil
+      storage.verify_token(admin_token).should be_nil
+    end
+  end
+
+  it "cleans up" do
+    with_storage do
+      true
+    end
+    State.reset
+  end
+end

spec/util_spec.cr

@@ -0,0 +1,73 @@
+require "./spec_helper"
+
+describe "compare_numerically" do
+  it "sorts filenames with leading zeros correctly" do
+    ary = ["010.jpg", "001.jpg", "002.png"]
+    ary.sort! { |a, b|
+      compare_numerically a, b
+    }
+    ary.should eq ["001.jpg", "002.png", "010.jpg"]
+  end
+
+  it "sorts filenames without leading zeros correctly" do
+    ary = ["10.jpg", "1.jpg", "0.png", "0100.jpg"]
+    ary.sort! { |a, b|
+      compare_numerically a, b
+    }
+    ary.should eq ["0.png", "1.jpg", "10.jpg", "0100.jpg"]
+  end
+
+  # https://ux.stackexchange.com/a/95441
+  it "sorts like the stack exchange post" do
+    ary = ["2", "12", "200000", "1000000", "a", "a12", "b2", "text2",
+           "text2a", "text2a2", "text2a12", "text2ab", "text12", "text12a"]
+    ary.reverse.sort! { |a, b|
+      compare_numerically a, b
+    }.should eq ary
+  end
+
+  # https://github.com/hkalexling/Mango/issues/22
+  it "handles numbers larger than Int32" do
+    ary = ["14410155591588.jpg", "21410155591588.png", "104410155591588.jpg"]
+    ary.reverse.sort! { |a, b|
+      compare_numerically a, b
+    }.should eq ary
+  end
+end
+
+describe "is_supported_file" do
+  it "returns true when the filename has a supported extension" do
+    filename = "manga.cbz"
+    is_supported_file(filename).should eq true
+  end
+
+  it "returns true when the filename does not have a supported extension" do
+    filename = "info.json"
+    is_supported_file(filename).should eq false
+  end
+
+  it "is case insensitive" do
+    filename = "manga.ZiP"
+    is_supported_file(filename).should eq true
+  end
+end
+
+describe "chapter_sort" do
+  it "sorts correctly" do
+    ary = ["Vol.1 Ch.01", "Vol.1 Ch.02", "Vol.2 Ch. 2.5", "Ch. 3", "Ch.04"]
+    sorter = ChapterSorter.new ary
+    ary.reverse.sort! do |a, b|
+      sorter.compare a, b
+    end.should eq ary
+  end
+end
+
+describe "sanitize_filename" do
+  it "returns a random string for empty sanitized string" do
+    sanitize_filename("..").should_not eq sanitize_filename("..")
+  end
+  it "sanitizes correctly" do
+    sanitize_filename("..  \n\v.\rマンゴー/|*()<[1/2] 3.14 hello world ")
+      .should eq "マンゴー_()[1_2] 3.14 hello world"
+  end
+end

src/archive.cr

@@ -0,0 +1,59 @@
+require "compress/zip"
+require "archive"
+
+# A unified class to handle all supported archive formats. It uses the
+#   Compress::Zip module in crystal standard library if the target file is
+#   a zip archive. Otherwise it uses `archive.cr`.
+class ArchiveFile
+  def initialize(@filename : String)
+    if [".cbz", ".zip"].includes? File.extname filename
+      @archive_file = Compress::Zip::File.new filename
+    else
+      @archive_file = Archive::File.new filename
+    end
+  end
+
+  def self.open(filename : String, &)
+    s = self.new filename
+    yield s
+    s.close
+  end
+
+  def close
+    if @archive_file.is_a? Compress::Zip::File
+      @archive_file.as(Compress::Zip::File).close
+    end
+  end
+
+  # Lists all file entries
+  def entries
+    ary = [] of Compress::Zip::File::Entry | Archive::Entry
+    @archive_file.entries.map do |e|
+      if (e.is_a? Compress::Zip::File::Entry && e.file?) ||
+         (e.is_a? Archive::Entry && e.info.file?)
+        ary.push e
+      end
+    end
+    ary
+  end
+
+  def read_entry(e : Compress::Zip::File::Entry | Archive::Entry) : Bytes?
+    if e.is_a? Compress::Zip::File::Entry
+      data = nil
+      e.open do |io|
+        slice = Bytes.new e.uncompressed_size
+        bytes_read = io.read_fully? slice
+        data = slice if bytes_read
+      end
+      data
+    else
+      e.read
+    end
+  end
+
+  def check
+    if @archive_file.is_a? Archive::File
+      @archive_file.as(Archive::File).check
+    end
+  end
+end

src/auth_handler.cr

@@ -1,26 +0,0 @@
-require "kemal"
-require "./storage"
-require "./util"
-
-class AuthHandler < Kemal::Handler
-	def initialize(@storage : Storage)
-	end
-
-	def call(env)
-		return call_next(env) \
-			if request_path_startswith env, ["/login", "/logout"]
-
-		cookie = env.request.cookies.find { |c| c.name == "token" }
-		if cookie.nil? || ! @storage.verify_token cookie.value
-			return env.redirect "/login"
-		end
-
-		if request_path_startswith env, ["/admin", "/api/admin"]
-			unless @storage.verify_admin cookie.value
-				env.response.status_code = 403
-			end
-		end
-
-		call_next env
-	end
-end

src/config.cr

@@ -1,44 +1,82 @@
 require "yaml"
 
 class Config
-	include YAML::Serializable
+  include YAML::Serializable
 
-	@[YAML::Field(key: "port")]
-	property port : Int32 = 9000
+  @[YAML::Field(ignore: true)]
+  property path = ""
+  property host = "0.0.0.0"
+  property port : Int32 = 9000
+  property base_url = "/"
+  property session_secret = "mango-session-secret"
+  property library_path = "~/mango/library"
+  property library_cache_path = "~/mango/library.yml.gz"
+  property db_path = "~/mango/mango.db"
+  property queue_db_path = "~/mango/queue.db"
+  property scan_interval_minutes : Int32 = 5
+  property thumbnail_generation_interval_hours : Int32 = 24
+  property log_level = "info"
+  property upload_path = "~/mango/uploads"
+  property plugin_path = "~/mango/plugins"
+  property download_timeout_seconds : Int32 = 30
+  property cache_enabled = true
+  property cache_size_mbs = 50
+  property cache_log_enabled = true
+  property disable_login = false
+  property default_username = ""
+  property auth_proxy_header_name = ""
+  property plugin_update_interval_hours : Int32 = 24
 
-	@[YAML::Field(key: "library_path")]
-	property library_path : String = \
-		File.expand_path "~/mango/library", home: true
+  @@singlet : Config?
 
-	@[YAML::Field(key: "db_path")]
-	property db_path : String = \
-		File.expand_path "~/mango/mango.db", home: true
+  def self.current
+    @@singlet.not_nil!
+  end
 
-	@[YAML::Field(key: "scan_interval_minutes")]
-	property scan_interval : Int32 = 5
+  def set_current
+    @@singlet = self
+  end
 
-	@[YAML::Field(key: "log_level")]
-	property log_level : String = "info"
+  def self.load(path : String?)
+    path = "~/.config/mango/config.yml" if path.nil?
+    cfg_path = File.expand_path path, home: true
+    if File.exists? cfg_path
+      config = self.from_yaml File.read cfg_path
+      config.path = path
+      config.expand_paths
+      config.preprocess
+      return config
+    end
+    puts "The config file #{cfg_path} does not exist. " \
+         "Dumping the default config there."
+    default = self.allocate
+    default.path = path
+    default.expand_paths
+    cfg_dir = File.dirname cfg_path
+    unless Dir.exists? cfg_dir
+      Dir.mkdir_p cfg_dir
+    end
+    File.write cfg_path, default.to_yaml
+    puts "The config file has been created at #{cfg_path}."
+    default
+  end
 
-	def self.load(path : String?)
-		path = "~/.config/mango/config.yml" if path.nil?
-		cfg_path = File.expand_path path, home: true
-		if File.exists? cfg_path
-			return self.from_yaml File.read cfg_path
-		end
-		puts "The config file #{cfg_path} does not exist." \
-			" Do you want mango to dump the default config there? [Y/n]"
-		input = gets
-		if input && input.downcase == "n"
-			abort "Aborting..."
-		end
-		default = self.allocate
-		cfg_dir = File.dirname cfg_path
-		unless Dir.exists? cfg_dir
-			Dir.mkdir_p cfg_dir
-		end
-		File.write cfg_path, default.to_yaml
-		puts "The config file has been created at #{cfg_path}."
-		default
-	end
+  def expand_paths
+    {% for p in %w(library library_cache db queue_db upload plugin) %}
+      @{{p.id}}_path = File.expand_path @{{p.id}}_path, home: true
+    {% end %}
+  end
+
+  def preprocess
+    unless base_url.starts_with? "/"
+      raise "base url (#{base_url}) should start with `/`"
+    end
+    unless base_url.ends_with? "/"
+      @base_url += "/"
+    end
+    if disable_login && default_username.empty?
+      raise "Login is disabled, but default username is not set. " \
+            "Please set a default username"
+    end
+  end
 end

src/context.cr

@@ -1,20 +0,0 @@
-require "./config"
-require "./library"
-require "./storage"
-require "./logger"
-
-class Context
-	property config : Config
-	property library : Library
-	property storage : Storage
-	property logger : MLogger
-
-	def initialize(@config, @logger, @library, @storage)
-	end
-
-	{% for lvl in LEVELS %}
-		def {{lvl.id}}(msg)
-			@logger.{{lvl.id}} msg
-		end
-	{% end %}
-end

src/handlers/auth_handler.cr

@@ -0,0 +1,119 @@
+require "kemal"
+require "../storage"
+require "../util/*"
+
+class AuthHandler < Kemal::Handler
+  # Some of the code is copied form kemalcr/kemal-basic-auth on GitHub
+
+  BASIC        = "Basic"
+  BEARER       = "Bearer"
+  AUTH         = "Authorization"
+  AUTH_MESSAGE = "Could not verify your access level for that URL.\n" \
+                 "You have to login with proper credentials"
+  HEADER_LOGIN_REQUIRED = "Basic realm=\"Login Required\""
+
+  def require_basic_auth(env)
+    env.response.status_code = 401
+    env.response.headers["WWW-Authenticate"] = HEADER_LOGIN_REQUIRED
+    env.response.print AUTH_MESSAGE
+  end
+
+  def require_auth(env)
+    if request_path_startswith env, ["/api"]
+      # Do not redirect API requests
+      env.response.status_code = 401
+      send_text env, "Unauthorized"
+    else
+      env.session.string "callback", env.request.path
+      redirect env, "/login"
+    end
+  end
+
+  def validate_token(env)
+    token = env.session.string? "token"
+    !token.nil? && Storage.default.verify_token token
+  end
+
+  def validate_token_admin(env)
+    token = env.session.string? "token"
+    !token.nil? && Storage.default.verify_admin token
+  end
+
+  def validate_auth_header(env)
+    if env.request.headers[AUTH]?
+      if value = env.request.headers[AUTH]
+        if value.starts_with? BASIC
+          token = verify_user value
+          return false if token.nil?
+
+          env.session.string "token", token
+          return true
+        end
+        if value.starts_with? BEARER
+          session_id = value.split(" ")[1]
+          token = Kemal::Session.get(session_id).try &.string? "token"
+          return !token.nil? && Storage.default.verify_token token
+        end
+      end
+    end
+    false
+  end
+
+  def verify_user(value)
+    username, password = Base64.decode_string(value[BASIC.size + 1..-1])
+      .split(":")
+    Storage.default.verify_user username, password
+  end
+
+  def call(env)
+    # OPTIONS requests do not require authentication
+    if env.request.method === "OPTIONS"
+      return call_next(env)
+    end
+    # Skip all authentication if requesting /login, /logout, /api/login,
+    #   or a static file
+    if request_path_startswith(env, ["/login", "/logout", "/api/login"]) ||
+       requesting_static_file env
+      return call_next(env)
+    end
+
+    # Check user is logged in
+    if validate_token(env) || validate_auth_header(env)
+      # Skip if the request has a valid token (either from cookies or header)
+    elsif Config.current.disable_login
+      # Check default username if login is disabled
+      unless Storage.default.username_exists Config.current.default_username
+        Logger.warn "Default username #{Config.current.default_username} " \
+                    "does not exist"
+        return require_auth env
+      end
+    elsif !Config.current.auth_proxy_header_name.empty?
+      # Check auth proxy if present
+      username = env.request.headers[Config.current.auth_proxy_header_name]?
+      unless username && Storage.default.username_exists username
+        Logger.warn "Header #{Config.current.auth_proxy_header_name} unset " \
+                    "or is not a valid username"
+        return require_auth env
+      end
+    elsif request_path_startswith env, ["/opds"]
+      # Check auth header if requesting an opds page
+      unless validate_auth_header env
+        return require_basic_auth env
+      end
+    else
+      return require_auth env
+    end
+
+    # Check admin access when requesting an admin page
+    if request_path_startswith env, %w(/admin /api/admin /download)
+      unless is_admin? env
+        env.response.status_code = 403
+        return send_error_page "HTTP 403: You are not authorized to visit " \
+                               "#{env.request.path}"
+      end
+    end
+
+    # Let the request go through if it passes the above checks
+    call_next env
+  end
+end

src/handlers/cors_handler.cr

@@ -0,0 +1,8 @@
+class CORSHandler < Kemal::Handler
+  def call(env)
+    if request_path_startswith env, ["/api"]
+      env.response.headers["Access-Control-Allow-Origin"] = "*"
+    end
+    call_next env
+  end
+end

src/handlers/log_handler.cr

@@ -0,0 +1,23 @@
+require "kemal"
+require "../logger"
+
+class LogHandler < Kemal::BaseLogHandler
+  def call(env)
+    elapsed_time = Time.measure { call_next env }
+    elapsed_text = elapsed_text elapsed_time
+    msg = "#{env.response.status_code} #{env.request.method}" \
+          " #{env.request.resource} #{elapsed_text}"
+    Logger.debug msg
+    env
+  end
+
+  def write(msg)
+    Logger.debug msg
+  end
+
+  private def elapsed_text(elapsed)
+    millis = elapsed.total_milliseconds
+    return "#{millis.round(2)}ms" if millis >= 1
+    "#{(millis * 1000).round(2)}µs"
+  end
+end

src/handlers/static_handler.cr

@@ -0,0 +1,30 @@
+require "baked_file_system"
+require "kemal"
+require "../util/*"
+
+class FS
+  extend BakedFileSystem
+  {% if flag?(:release) %}
+    {% if read_file? "#{__DIR__}/../../dist/favicon.ico" %}
+      {% puts "baking ../../dist" %}
+      bake_folder "../../dist"
+    {% else %}
+      {% puts "baking ../../public" %}
+      bake_folder "../../public"
+    {% end %}
+  {% end %}
+end
+
+class StaticHandler < Kemal::Handler
+  def call(env)
+    if requesting_static_file env
+      file = FS.get? env.request.path
+      return call_next env if file.nil?
+
+      slice = Bytes.new file.size
+      file.read slice
+      return send_file env, slice, MIME.from_filename file.path
+    end
+    call_next env
+  end
+end

src/handlers/upload_handler.cr

@@ -0,0 +1,26 @@
+require "kemal"
+require "../util/*"
+
+class UploadHandler < Kemal::Handler
+  def initialize(@upload_dir : String)
+  end
+
+  def call(env)
+    unless request_path_startswith(env, [UPLOAD_URL_PREFIX]) &&
+           env.request.method == "GET"
+      return call_next env
+    end
+
+    ary = env.request.path.split(File::SEPARATOR).select do |part|
+      !part.empty?
+    end
+    ary[0] = @upload_dir
+    path = File.join ary
+
+    if File.exists? path
+      send_file env, path
+    else
+      env.response.status_code = 404
+    end
+  end
+end

src/library.cr

@@ -1,210 +0,0 @@
-require "zip"
-require "mime"
-require "json"
-require "uri"
-
-struct Image
-	property data : Bytes
-	property mime : String
-	property filename : String
-	property size : Int32
-
-	def initialize(@data, @mime, @filename, @size)
-	end
-end
-
-class Entry
-	JSON.mapping zip_path: String, book_title: String, title: String, \
-		size: String, pages: Int32, cover_url: String, id: String, \
-		title_id: String, encoded_path: String, encoded_title: String,
-		mtime: Time
-
-	def initialize(path, @book_title, @title_id, storage)
-		@zip_path = path
-		@encoded_path = URI.encode path
-		@title = File.basename path, File.extname path
-		@encoded_title = URI.encode @title
-		@size = (File.size path).humanize_bytes
-		file = Zip::File.new path
-		@pages = file.entries
-			.select { |e|
-				["image/jpeg", "image/png"].includes? \
-				MIME.from_filename? e.filename
-			}
-			.size
-		file.close
-		@id = storage.get_id @zip_path, false
-		@cover_url = "/api/page/#{@title_id}/#{@id}/1"
-		@mtime = File.info(@zip_path).modification_time
-	end
-	def read_page(page_num)
-		Zip::File.open @zip_path do |file|
-			page = file.entries
-				.select { |e|
-					["image/jpeg", "image/png"].includes? \
-					MIME.from_filename? e.filename
-				}
-				.sort { |a, b| a.filename <=> b.filename }
-				.[page_num - 1]
-			page.open do |io|
-				slice = Bytes.new page.uncompressed_size
-				bytes_read = io.read_fully? slice
-				unless bytes_read
-					return nil
-				end
-				return Image.new slice, MIME.from_filename(page.filename),\
-					page.filename, bytes_read
-			end
-		end
-	end
-end
-
-class Title
-	JSON.mapping dir: String, entries: Array(Entry), title: String,
-		id: String, encoded_title: String, mtime: Time, logger: MLogger
-
-	def initialize(dir : String, storage, @logger : MLogger)
-		@dir = dir
-		@id = storage.get_id @dir, true
-		@title = File.basename dir
-		@encoded_title = URI.encode @title
-		@entries = (Dir.entries dir)
-			.select { |path| [".zip", ".cbz"].includes? File.extname path }
-			.map { |path| File.join dir, path }
-			.select { |path| valid_zip path }
-			.map { |path|
-				Entry.new path, @title, @id, storage
-			}
-			.select { |e| e.pages > 0 }
-			.sort { |a, b| a.title <=> b.title }
-		mtimes = [File.info(dir).modification_time]
-		mtimes += @entries.map{|e| e.mtime}
-		@mtime = mtimes.max
-	end
-	# When downloading from MangaDex, the zip/cbz file would not be valid
-	#	before the download is completed. If we scan the zip file,
-	#	Entry.new would throw, so we use this method to check before
-	#	constructing Entry
-	private def valid_zip(path : String)
-		begin
-			file = Zip::File.new path
-			file.close
-			return true
-		rescue
-			@logger.warn "File #{path} is corrupted or is not a valid zip "\
-				"archive. Ignoring it."
-			return false
-		end
-	end
-	def get_entry(eid)
-		@entries.find { |e| e.id == eid }
-	end
-	# For backward backward compatibility with v0.1.0, we save entry titles
-	#	instead of IDs in info.json
-	def save_progress(username, entry, page)
-		info = TitleInfo.new @dir
-		if info.progress[username]?.nil?
-			info.progress[username] = {entry => page}
-			info.save @dir
-			return
-		end
-		info.progress[username][entry] = page
-		info.save @dir
-	end
-	def load_progress(username, entry)
-		info = TitleInfo.new @dir
-		if info.progress[username]?.nil?
-			return 0
-		end
-		if info.progress[username][entry]?.nil?
-			return 0
-		end
-		info.progress[username][entry]
-	end
-	def load_percetage(username, entry)
-		info = TitleInfo.new @dir
-		page = load_progress username, entry
-		entry_obj = @entries.find{|e| e.title == entry}
-		return 0 if entry_obj.nil?
-		page / entry_obj.pages
-	end
-	def load_percetage(username)
-		read_pages = total_pages = 0
-		@entries.each do |e|
-			read_pages += load_progress username, e.title
-			total_pages += e.pages
-		end
-		read_pages / total_pages
-	end
-	def next_entry(current_entry_obj)
-		idx = @entries.index current_entry_obj
-		return nil if idx.nil? || idx == @entries.size - 1
-		@entries[idx + 1]
-	end
-end
-
-class TitleInfo
-	# { user1: { entry1: 10, entry2: 0 } }
-	include JSON::Serializable
-
-	@[JSON::Field(key: "comment")]
-	property comment = "Generated by Mango. DO NOT EDIT!"
-
-	@[JSON::Field(key: "progress")]
-	property progress : Hash(String, Hash(String, Int32))
-
-	def initialize(title_dir)
-		info = nil
-
-		json_path = File.join title_dir, "info.json"
-		if File.exists? json_path
-			info = TitleInfo.from_json File.read json_path
-		else
-			info = TitleInfo.from_json "{\"progress\": {}}"
-		end
-
-		@progress = info.progress.clone
-	end
-	def save(title_dir)
-		json_path = File.join title_dir, "info.json"
-		File.write json_path, self.to_pretty_json
-	end
-end
-
-class Library
-	JSON.mapping dir: String, titles: Array(Title), scan_interval: Int32,
-		logger: MLogger, storage: Storage
-
-	def initialize(@dir, @scan_interval, @logger, @storage)
-		# explicitly initialize @titles to bypass the compiler check. it will
-		#	be filled with actual Titles in the `scan` call below
-		@titles = [] of Title
-
-		return scan if @scan_interval < 1
-		spawn do
-			loop do
-				start = Time.local
-				scan
-				ms = (Time.local - start).total_milliseconds
-				@logger.info "Scanned #{@titles.size} titles in #{ms}ms"
-				sleep @scan_interval * 60
-			end
-		end
-	end
-	def get_title(tid)
-		@titles.find { |t| t.id == tid }
-	end
-	def scan
-		unless Dir.exists? @dir
-			@logger.info "The library directory #{@dir} does not exist. " \
-				"Attempting to create it"
-			Dir.mkdir_p @dir
-		end
-		@titles = (Dir.entries @dir)
-			.select { |path| File.directory? File.join @dir, path }
-			.map { |path| Title.new File.join(@dir, path), @storage, @logger }
-			.select { |title| !title.entries.empty? }
-			.sort { |a, b| a.title <=> b.title }
-		@logger.debug "Scan completed"
-	end
-end

src/library/cache.cr

@@ -0,0 +1,218 @@
+require "digest"
+
+require "./entry"
+require "./title"
+require "./types"
+
+# Base class for an entry in the LRU cache.
+# There are two ways to use it:
+#   1. Use it as it is by instantiating with the appropriate `SaveT` and
+#     `ReturnT`. Note that in this case, `SaveT` and `ReturnT` must be the
+#     same type. That is, the input value will be stored as it is without
+#     any transformation.
+#   2. You can also subclass it and provide custom implementations for
+#     `to_save_t` and `to_return_t`. This allows you to transform and store
+#     the input value to a different type. See `SortedEntriesCacheEntry` as
+#     an example.
+private class CacheEntry(SaveT, ReturnT)
+  getter key : String, atime : Time
+
+  @value : SaveT
+
+  def initialize(@key : String, value : ReturnT)
+    @atime = @ctime = Time.utc
+    @value = self.class.to_save_t value
+  end
+
+  def value
+    @atime = Time.utc
+    self.class.to_return_t @value
+  end
+
+  def self.to_save_t(value : ReturnT)
+    value
+  end
+
+  def self.to_return_t(value : SaveT)
+    value
+  end
+
+  def instance_size
+    instance_sizeof(CacheEntry(SaveT, ReturnT)) + # sizeof itself
+      instance_sizeof(String) + @key.bytesize +   # allocated memory for @key
+      @value.instance_size
+  end
+end
+
+class SortedEntriesCacheEntry < CacheEntry(Array(String), Array(Entry))
+  def self.to_save_t(value : Array(Entry))
+    value.map &.id
+  end
+
+  def self.to_return_t(value : Array(String))
+    ids_to_entries value
+  end
+
+  private def self.ids_to_entries(ids : Array(String))
+    e_map = Library.default.deep_entries.to_h { |entry| {entry.id, entry} }
+    entries = [] of Entry
+    begin
+      ids.each do |id|
+        entries << e_map[id]
+      end
+      return entries if ids.size == entries.size
+    rescue
+    end
+  end
+
+  def instance_size
+    instance_sizeof(SortedEntriesCacheEntry) +  # sizeof itself
+      instance_sizeof(String) + @key.bytesize + # allocated memory for @key
+      @value.size * (instance_sizeof(String) + sizeof(String)) +
+      @value.sum(&.bytesize) # elements in Array(String)
+  end
+
+  def self.gen_key(book_id : String, username : String,
+                   entries : Array(Entry), opt : SortOptions?)
+    entries_sig = Digest::SHA1.hexdigest (entries.map &.id).to_s
+    user_context = opt && opt.method == SortMethod::Progress ? username : ""
+    sig = Digest::SHA1.hexdigest (book_id + entries_sig + user_context +
+                                  (opt ? opt.to_tuple.to_s : "nil"))
+    "#{sig}:sorted_entries"
+  end
+end
+
+class SortedTitlesCacheEntry < CacheEntry(Array(String), Array(Title))
+  def self.to_save_t(value : Array(Title))
+    value.map &.id
+  end
+
+  def self.to_return_t(value : Array(String))
+    value.map { |title_id| Library.default.title_hash[title_id].not_nil! }
+  end
+
+  def instance_size
+    instance_sizeof(SortedTitlesCacheEntry) +   # sizeof itself
+      instance_sizeof(String) + @key.bytesize + # allocated memory for @key
+      @value.size * (instance_sizeof(String) + sizeof(String)) +
+      @value.sum(&.bytesize) # elements in Array(String)
+  end
+
+  def self.gen_key(username : String, titles : Array(Title), opt : SortOptions?)
+    titles_sig = Digest::SHA1.hexdigest (titles.map &.id).to_s
+    user_context = opt && opt.method == SortMethod::Progress ? username : ""
+    sig = Digest::SHA1.hexdigest (titles_sig + user_context +
+                                  (opt ? opt.to_tuple.to_s : "nil"))
+    "#{sig}:sorted_titles"
+  end
+end
+
+class String
+  def instance_size
+    instance_sizeof(String) + bytesize
+  end
+end
+
+struct Tuple(*T)
+  def instance_size
+    sizeof(T) + # total size of non-reference types
+      self.sum do |e|
+        next 0 unless e.is_a? Reference
+        if e.responds_to? :instance_size
+          e.instance_size
+        else
+          instance_sizeof(typeof(e))
+        end
+      end
+  end
+end
+
+alias CacheableType = Array(Entry) | Array(Title) | String |
+                      Tuple(String, Int32)
+alias CacheEntryType = SortedEntriesCacheEntry |
+                       SortedTitlesCacheEntry |
+                       CacheEntry(String, String) |
+                       CacheEntry(Tuple(String, Int32), Tuple(String, Int32))
+
+def generate_cache_entry(key : String, value : CacheableType)
+  if value.is_a? Array(Entry)
+    SortedEntriesCacheEntry.new key, value
+  elsif value.is_a? Array(Title)
+    SortedTitlesCacheEntry.new key, value
+  else
+    CacheEntry(typeof(value), typeof(value)).new key, value
+  end
+end
+
+# LRU Cache
+class LRUCache
+  @@limit : Int128 = Int128.new 0
+  @@should_log = true
+  # key => entry
+  @@cache = {} of String => CacheEntryType
+
+  def self.enabled
+    Config.current.cache_enabled
+  end
+
+  def self.init
+    cache_size = Config.current.cache_size_mbs
+    @@limit = Int128.new cache_size * 1024 * 1024 if enabled
+    @@should_log = Config.current.cache_log_enabled
+  end
+
+  def self.get(key : String)
+    return unless enabled
+    entry = @@cache[key]?
+    if @@should_log
+      Logger.debug "LRUCache #{entry.nil? ? "miss" : "hit"} #{key}"
+    end
+    return entry.value unless entry.nil?
+  end
+
+  def self.set(cache_entry : CacheEntryType)
+    return unless enabled
+    key = cache_entry.key
+    @@cache[key] = cache_entry
+    Logger.debug "LRUCache cached #{key}" if @@should_log
+    remove_least_recent_access
+  end
+
+  def self.invalidate(key : String)
+    return unless enabled
+    @@cache.delete key
+  end
+
+  def self.print
+    return unless @@should_log
+    sum = @@cache.sum { |_, entry| entry.instance_size }
+    Logger.debug "---- LRU Cache ----"
+    Logger.debug "Size: #{sum} Bytes"
+    Logger.debug "List:"
+    @@cache.each do |k, v|
+      Logger.debug "#{k} | #{v.atime} | #{v.instance_size}"
+    end
+    Logger.debug "-------------------"
+  end
+
+  private def self.is_cache_full
+    sum = @@cache.sum { |_, entry| entry.instance_size }
+    sum > @@limit
+  end
+
+  private def self.remove_least_recent_access
+    if @@should_log && is_cache_full
+      Logger.debug "Removing entries from LRUCache"
+    end
+    while is_cache_full && @@cache.size > 0
+      min_tuple = @@cache.min_by { |_, entry| entry.atime }
+      min_key = min_tuple[0]
+      min_entry = min_tuple[1]
+
+      Logger.debug "  \
+        Target: #{min_key}, \
+        Last Access Time: #{min_entry.atime}" if @@should_log
+      invalidate min_key
+    end
+  end
+end

src/library/entry.cr

@@ -0,0 +1,302 @@
+require "image_size"
+require "yaml"
+
+class Entry
+  include YAML::Serializable
+
+  getter zip_path : String, book : Title, title : String,
+    size : String, pages : Int32, id : String, encoded_path : String,
+    encoded_title : String, mtime : Time, err_msg : String?
+
+  @[YAML::Field(ignore: true)]
+  @sort_title : String?
+
+  def initialize(@zip_path, @book)
+    storage = Storage.default
+    @encoded_path = URI.encode @zip_path
+    @title = File.basename @zip_path, File.extname @zip_path
+    @encoded_title = URI.encode @title
+    @size = (File.size @zip_path).humanize_bytes
+    id = storage.get_entry_id @zip_path, File.signature(@zip_path)
+    if id.nil?
+      id = random_str
+      storage.insert_entry_id({
+        path:      @zip_path,
+        id:        id,
+        signature: File.signature(@zip_path).to_s,
+      })
+    end
+    @id = id
+    @mtime = File.info(@zip_path).modification_time
+
+    unless File.readable? @zip_path
+      @err_msg = "File #{@zip_path} is not readable."
+      Logger.warn "#{@err_msg} Please make sure the " \
+                  "file permission is configured correctly."
+      return
+    end
+
+    archive_exception = validate_archive @zip_path
+    unless archive_exception.nil?
+      @err_msg = "Archive error: #{archive_exception}"
+      Logger.warn "Unable to extract archive #{@zip_path}. " \
+                  "Ignoring it. #{@err_msg}"
+      return
+    end
+
+    file = ArchiveFile.new @zip_path
+    @pages = file.entries.count do |e|
+      SUPPORTED_IMG_TYPES.includes? \
+        MIME.from_filename? e.filename
+    end
+    file.close
+  end
+
+  def build_json(*, slim = false)
+    JSON.build do |json|
+      json.object do
+        {% for str in %w(zip_path title size id) %}
+        json.field {{str}}, @{{str.id}}
+      {% end %}
+        if err_msg
+          json.field "err_msg", err_msg
+        end
+        json.field "title_id", @book.id
+        json.field "title_title", @book.title
+        json.field "sort_title", sort_title
+        json.field "pages" { json.number @pages }
+        unless slim
+          json.field "display_name", @book.display_name @title
+          json.field "cover_url", cover_url
+          json.field "mtime" { json.number @mtime.to_unix }
+        end
+      end
+    end
+  end
+
+  def sort_title
+    sort_title_cached = @sort_title
+    return sort_title_cached if sort_title_cached
+    sort_title = @book.entry_sort_title_db id
+    if sort_title
+      @sort_title = sort_title
+      return sort_title
+    end
+    @sort_title = @title
+    @title
+  end
+
+  def set_sort_title(sort_title : String | Nil, username : String)
+    Storage.default.set_entry_sort_title id, sort_title
+    if sort_title == "" || sort_title.nil?
+      @sort_title = nil
+    else
+      @sort_title = sort_title
+    end
+
+    @book.entry_sort_title_cache = nil
+    @book.remove_sorted_entries_cache [SortMethod::Auto, SortMethod::Title],
+      username
+  end
+
+  def sort_title_db
+    @book.entry_sort_title_db @id
+  end
+
+  def display_name
+    @book.display_name @title
+  end
+
+  def encoded_display_name
+    URI.encode display_name
+  end
+
+  def cover_url
+    return "#{Config.current.base_url}img/icons/icon_x192.png" if @err_msg
+
+    unless @book.entry_cover_url_cache
+      TitleInfo.new @book.dir do |info|
+        @book.entry_cover_url_cache = info.entry_cover_url
+      end
+    end
+    entry_cover_url = @book.entry_cover_url_cache
+
+    url = "#{Config.current.base_url}api/cover/#{@book.id}/#{@id}"
+    if entry_cover_url
+      info_url = entry_cover_url[@title]?
+      unless info_url.nil? || info_url.empty?
+        url = File.join Config.current.base_url, info_url
+      end
+    end
+    url
+  end
+
+  private def sorted_archive_entries
+    ArchiveFile.open @zip_path do |file|
+      entries = file.entries
+        .select { |e|
+          SUPPORTED_IMG_TYPES.includes? \
+            MIME.from_filename? e.filename
+        }
+        .sort! { |a, b|
+          compare_numerically a.filename, b.filename
+        }
+      yield file, entries
+    end
+  end
+
+  def read_page(page_num)
+    raise "Unreadble archive. #{@err_msg}" if @err_msg
+    img = nil
+    begin
+      sorted_archive_entries do |file, entries|
+        page = entries[page_num - 1]
+        data = file.read_entry page
+        if data
+          img = Image.new data, MIME.from_filename(page.filename),
+            page.filename, data.size
+        end
+      end
+    rescue e
+      Logger.warn "Unable to read page #{page_num} of #{@zip_path}. Error: #{e}"
+    end
+    img
+  end
+
+  def page_dimensions
+    sizes = [] of Hash(String, Int32)
+    sorted_archive_entries do |file, entries|
+      entries.each_with_index do |e, i|
+        begin
+          data = file.read_entry(e).not_nil!
+          size = ImageSize.get data
+          sizes << {
+            "width"  => size.width,
+            "height" => size.height,
+          }
+        rescue e
+          Logger.warn "Failed to read page #{i} of entry #{zip_path}. #{e}"
+          sizes << {"width" => 1000_i32, "height" => 1000_i32}
+        end
+      end
+    end
+    sizes
+  end
+
+  def next_entry(username)
+    entries = @book.sorted_entries username
+    idx = entries.index self
+    return nil if idx.nil? || idx == entries.size - 1
+    entries[idx + 1]
+  end
+
+  def previous_entry(username)
+    entries = @book.sorted_entries username
+    idx = entries.index self
+    return nil if idx.nil? || idx == 0
+    entries[idx - 1]
+  end
+
+  def date_added
+    date_added = nil
+    TitleInfo.new @book.dir do |info|
+      info_da = info.date_added[@title]?
+      if info_da.nil?
+        date_added = info.date_added[@title] = ctime @zip_path
+        info.save
+      else
+        date_added = info_da
+      end
+    end
+    date_added.not_nil! # is it ok to set not_nil! here?
+  end
+
+  # For backward backward compatibility with v0.1.0, we save entry titles
+  #   instead of IDs in info.json
+  def save_progress(username, page)
+    LRUCache.invalidate "#{@book.id}:#{username}:progress_sum"
+    @book.parents.each do |parent|
+      LRUCache.invalidate "#{parent.id}:#{username}:progress_sum"
+    end
+    @book.remove_sorted_caches [SortMethod::Progress], username
+
+    TitleInfo.new @book.dir do |info|
+      if info.progress[username]?.nil?
+        info.progress[username] = {@title => page}
+      else
+        info.progress[username][@title] = page
+      end
+      # save last_read timestamp
+      if info.last_read[username]?.nil?
+        info.last_read[username] = {@title => Time.utc}
+      else
+        info.last_read[username][@title] = Time.utc
+      end
+      info.save
+    end
+  end
+
+  def load_progress(username)
+    progress = 0
+    TitleInfo.new @book.dir do |info|
+      unless info.progress[username]?.nil? ||
+             info.progress[username][@title]?.nil?
+        progress = info.progress[username][@title]
+      end
+    end
+    [progress, @pages].min
+  end
+
+  def load_percentage(username)
+    page = load_progress username
+    page / @pages
+  end
+
+  def load_last_read(username)
+    last_read = nil
+    TitleInfo.new @book.dir do |info|
+      unless info.last_read[username]?.nil? ||
+             info.last_read[username][@title]?.nil?
+        last_read = info.last_read[username][@title]
+      end
+    end
+    last_read
+  end
+
+  def finished?(username)
+    load_progress(username) == @pages
+  end
+
+  def started?(username)
+    load_progress(username) > 0
+  end
+
+  def generate_thumbnail : Image?
+    return if @err_msg
+
+    img = read_page(1).not_nil!
+    begin
+      size = ImageSize.get img.data
+      if size.height > size.width
+        thumbnail = ImageSize.resize img.data, width: 200
+      else
+        thumbnail = ImageSize.resize img.data, height: 300
+      end
+      img.data = thumbnail
+      img.size = thumbnail.size
+      unless img.mime == "image/webp"
+        # image_size.cr resizes non-webp images to jpg
+        img.mime = "image/jpeg"
+      end
+      Storage.default.save_thumbnail @id, img
+    rescue e
+      Logger.warn "Failed to generate thumbnail for file #{@zip_path}. #{e}"
+    end
+
+    img
+  end
+
+  def get_thumbnail : Image?
+    Storage.default.get_thumbnail @id
+  end
+end

src/library/library.cr

@@ -0,0 +1,364 @@
+class Library
+  struct ThumbnailContext
+    property current : Int32, total : Int32
+
+    def initialize
+      @current = 0
+      @total = 0
+    end
+
+    def progress
+      if total == 0
+        0
+      else
+        current / total
+      end
+    end
+
+    def reset
+      @current = 0
+      @total = 0
+    end
+
+    def increment
+      @current += 1
+    end
+  end
+
+  include YAML::Serializable
+
+  getter dir : String, title_ids : Array(String),
+    title_hash : Hash(String, Title)
+
+  @[YAML::Field(ignore: true)]
+  getter thumbnail_ctx = ThumbnailContext.new
+
+  use_default
+
+  def save_instance
+    path = Config.current.library_cache_path
+    Logger.debug "Caching library to #{path}"
+
+    writer = Compress::Gzip::Writer.new path,
+      Compress::Gzip::BEST_COMPRESSION
+    writer.write self.to_yaml.to_slice
+    writer.close
+  end
+
+  def self.load_instance
+    path = Config.current.library_cache_path
+    return unless File.exists? path
+
+    Logger.debug "Loading cached library from #{path}"
+
+    begin
+      Compress::Gzip::Reader.open path do |content|
+        loaded = Library.from_yaml content
+        # We will have to do a full restart in these cases. Otherwise having
+        #   two instances of the library will cause some weirdness.
+        if loaded.dir != Config.current.library_path
+          Logger.fatal "Cached library dir #{loaded.dir} does not match " \
+                       "current library dir #{Config.current.library_path}. " \
+                       "Deleting cache"
+          delete_cache_and_exit path
+        end
+        if loaded.title_ids.size > 0 &&
+           Storage.default.count_titles == 0
+          Logger.fatal "The library cache is inconsistent with the DB. " \
+                       "Deleting cache"
+          delete_cache_and_exit path
+        end
+        @@default = loaded
+        Logger.debug "Library cache loaded"
+      end
+      Library.default.register_jobs
+    rescue e
+      Logger.error e
+    end
+  end
+
+  def initialize
+    @dir = Config.current.library_path
+    # explicitly initialize @titles to bypass the compiler check. it will
+    #   be filled with actual Titles in the `scan` call below
+    @title_ids = [] of String
+    @title_hash = {} of String => Title
+
+    register_jobs
+  end
+
+  protected def register_jobs
+    register_mime_types
+
+    scan_interval = Config.current.scan_interval_minutes
+    if scan_interval < 1
+      scan
+    else
+      spawn do
+        loop do
+          start = Time.local
+          scan
+          ms = (Time.local - start).total_milliseconds
+          Logger.debug "Library initialized in #{ms}ms"
+          sleep scan_interval.minutes
+        end
+      end
+    end
+
+    thumbnail_interval = Config.current.thumbnail_generation_interval_hours
+    unless thumbnail_interval < 1
+      spawn do
+        loop do
+          # Wait for scan to complete (in most cases)
+          sleep 1.minutes
+          generate_thumbnails
+          sleep thumbnail_interval.hours
+        end
+      end
+    end
+  end
+
+  def titles
+    @title_ids.map { |tid| self.get_title!(tid) }
+  end
+
+  def sorted_titles(username, opt : SortOptions? = nil)
+    if opt.nil?
+      opt = SortOptions.from_info_json @dir, username
+    end
+
+    # Helper function from src/util/util.cr
+    sort_titles titles, opt.not_nil!, username
+  end
+
+  def deep_titles
+    titles + titles.flat_map &.deep_titles
+  end
+
+  def deep_entries
+    titles.flat_map &.deep_entries
+  end
+
+  def build_json(*, slim = false, depth = -1, sort_context = nil,
+                 percentage = false)
+    _titles = if sort_context
+                sorted_titles sort_context[:username],
+                  sort_context[:opt]
+              else
+                self.titles
+              end
+    JSON.build do |json|
+      json.object do
+        json.field "dir", @dir
+        json.field "titles" do
+          json.array do
+            _titles.each do |title|
+              json.raw title.build_json(slim: slim, depth: depth,
+                sort_context: sort_context, percentage: percentage)
+            end
+          end
+        end
+        if percentage && sort_context
+          json.field "title_percentages" do
+            json.array do
+              _titles.each do |title|
+                json.number title.load_percentage sort_context[:username]
+              end
+            end
+          end
+        end
+      end
+    end
+  end
+
+  def get_title(tid)
+    @title_hash[tid]?
+  end
+
+  def get_title!(tid)
+    @title_hash[tid]
+  end
+
+  def scan
+    start = Time.local
+    unless Dir.exists? @dir
+      Logger.info "The library directory #{@dir} does not exist. " \
+                  "Attempting to create it"
+      Dir.mkdir_p @dir
+    end
+
+    storage = Storage.new auto_close: false
+
+    examine_context : ExamineContext = {
+      cached_contents_signature: {} of String => String,
+      deleted_title_ids:         [] of String,
+      deleted_entry_ids:         [] of String,
+    }
+
+    library_paths = (Dir.entries @dir)
+      .select { |fn| !fn.starts_with? "." }
+      .map { |fn| File.join @dir, fn }
+    @title_ids.select! do |title_id|
+      title = @title_hash[title_id]
+      next false unless library_paths.includes? title.dir
+      existence = title.examine examine_context
+      unless existence
+        examine_context["deleted_title_ids"].concat [title_id] +
+                                                    title.deep_titles.map &.id
+        examine_context["deleted_entry_ids"].concat title.deep_entries.map &.id
+      end
+      existence
+    end
+    remained_title_dirs = @title_ids.map { |id| title_hash[id].dir }
+    examine_context["deleted_title_ids"].each do |title_id|
+      @title_hash.delete title_id
+    end
+
+    cache = examine_context["cached_contents_signature"]
+    library_paths
+      .select { |path| !(remained_title_dirs.includes? path) }
+      .select { |path| File.directory? path }
+      .map { |path| Title.new path, "", cache }
+      .select { |title| !(title.entries.empty? && title.titles.empty?) }
+      .sort! { |a, b| a.sort_title <=> b.sort_title }
+      .each do |title|
+        @title_hash[title.id] = title
+        @title_ids << title.id
+      end
+
+    storage.bulk_insert_ids
+    storage.close
+
+    ms = (Time.local - start).total_milliseconds
+    Logger.info "Scanned #{@title_ids.size} titles in #{ms}ms"
+
+    Storage.default.mark_unavailable examine_context["deleted_entry_ids"],
+      examine_context["deleted_title_ids"]
+
+    spawn do
+      save_instance
+    end
+  end
+
+  def get_continue_reading_entries(username)
+    cr_entries = deep_titles
+      .map(&.get_last_read_entry username)
+      # Select elements with type `Entry` from the array and ignore all `Nil`s
+      .select(Entry)[0...ENTRIES_IN_HOME_SECTIONS]
+      .map { |e|
+        # Get the last read time of the entry. If it hasn't been started, get
+        #   the last read time of the previous entry
+        last_read = e.load_last_read username
+        pe = e.previous_entry username
+        if last_read.nil? && pe
+          last_read = pe.load_last_read username
+        end
+        {
+          entry:      e,
+          percentage: e.load_percentage(username),
+          last_read:  last_read,
+        }
+      }
+
+    # Sort by by last_read, most recent first (nils at the end)
+    cr_entries.sort { |a, b|
+      next 0 if a[:last_read].nil? && b[:last_read].nil?
+      next 1 if a[:last_read].nil?
+      next -1 if b[:last_read].nil?
+      b[:last_read].not_nil! <=> a[:last_read].not_nil!
+    }
+  end
+
+  alias RA = NamedTuple(
+    entry: Entry,
+    percentage: Float64,
+    grouped_count: Int32)
+
+  def get_recently_added_entries(username)
+    recently_added = [] of RA
+    last_date_added = nil
+
+    titles.flat_map(&.deep_entries_with_date_added)
+      .select(&.[:date_added].> 1.month.ago)
+      .sort! { |a, b| b[:date_added] <=> a[:date_added] }
+      .each do |e|
+        break if recently_added.size > 12
+        last = recently_added.last?
+        if last && e[:entry].book.id == last[:entry].book.id &&
+           (e[:date_added] - last_date_added.not_nil!).abs < 1.day
+          # A NamedTuple is immutable, so we have to cast it to a Hash first
+          last_hash = last.to_h
+          count = last_hash[:grouped_count].as(Int32)
+          last_hash[:grouped_count] = count + 1
+          # Setting the percentage to a negative value will hide the
+          #   percentage badge on the card
+          last_hash[:percentage] = -1.0
+          recently_added[recently_added.size - 1] = RA.from last_hash
+        else
+          last_date_added = e[:date_added]
+          recently_added << {
+            entry:         e[:entry],
+            percentage:    e[:entry].load_percentage(username),
+            grouped_count: 1,
+          }
+        end
+      end
+
+    recently_added[0...ENTRIES_IN_HOME_SECTIONS]
+  end
+
+  def get_start_reading_titles(username)
+    # Here we are not using `deep_titles` as it may cause unexpected behaviors
+    # For example, consider the following nested titles:
+    #   - One Puch Man
+    #     - Vol. 1
+    #     - Vol. 2
+    # If we use `deep_titles`, the start reading section might include `Vol. 2`
+    #   when the user hasn't started `Vol. 1` yet
+    titles
+      .select(&.load_percentage(username).== 0)
+      .sample(ENTRIES_IN_HOME_SECTIONS)
+      .shuffle!
+  end
+
+  def generate_thumbnails
+    if thumbnail_ctx.current > 0
+      Logger.debug "Thumbnail generation in progress"
+      return
+    end
+
+    Logger.info "Starting thumbnail generation"
+    entries = deep_titles.flat_map(&.deep_entries).reject &.err_msg
+    thumbnail_ctx.total = entries.size
+    thumbnail_ctx.current = 0
+
+    # Report generation progress regularly
+    spawn do
+      loop do
+        unless thumbnail_ctx.current == 0
+          Logger.debug "Thumbnail generation progress: " \
+                       "#{(thumbnail_ctx.progress * 100).round 1}%"
+        end
+        # Generation is completed. We reset the count to 0 to allow subsequent
+        #   calls to the function, and break from the loop to stop the progress
+        #   report fiber
+        if thumbnail_ctx.progress.to_i == 1
+          thumbnail_ctx.reset
+          break
+        end
+        sleep 10.seconds
+      end
+    end
+
+    entries.each do |e|
+      unless e.get_thumbnail
+        e.generate_thumbnail
+        # Sleep after each generation to minimize the impact on disk IO
+        #   and CPU
+        sleep 1.seconds
+      end
+      thumbnail_ctx.increment
+    end
+    Logger.info "Thumbnail generation finished"
+  end
+end

src/library/title.cr

@@ -0,0 +1,695 @@
+require "digest"
+require "../archive"
+
+class Title
+  include YAML::Serializable
+
+  getter dir : String, parent_id : String, title_ids : Array(String),
+    entries : Array(Entry), title : String, id : String,
+    encoded_title : String, mtime : Time, signature : UInt64,
+    entry_cover_url_cache : Hash(String, String)?
+  setter entry_cover_url_cache : Hash(String, String)?,
+    entry_sort_title_cache : Hash(String, String | Nil)?
+
+  @[YAML::Field(ignore: true)]
+  @sort_title : String?
+  @[YAML::Field(ignore: true)]
+  @entry_sort_title_cache : Hash(String, String | Nil)?
+  @[YAML::Field(ignore: true)]
+  @entry_display_name_cache : Hash(String, String)?
+  @[YAML::Field(ignore: true)]
+  @entry_cover_url_cache : Hash(String, String)?
+  @[YAML::Field(ignore: true)]
+  @cached_display_name : String?
+  @[YAML::Field(ignore: true)]
+  @cached_cover_url : String?
+
+  def initialize(@dir : String, @parent_id, cache = {} of String => String)
+    storage = Storage.default
+    @signature = Dir.signature dir
+    id = storage.get_title_id dir, signature
+    if id.nil?
+      id = random_str
+      storage.insert_title_id({
+        path:      dir,
+        id:        id,
+        signature: signature.to_s,
+      })
+    end
+    @id = id
+    @contents_signature = Dir.contents_signature dir, cache
+    @title = File.basename dir
+    @encoded_title = URI.encode @title
+    @title_ids = [] of String
+    @entries = [] of Entry
+    @mtime = File.info(dir).modification_time
+
+    Dir.entries(dir).each do |fn|
+      next if fn.starts_with? "."
+      path = File.join dir, fn
+      if File.directory? path
+        title = Title.new path, @id, cache
+        next if title.entries.size == 0 && title.titles.size == 0
+        Library.default.title_hash[title.id] = title
+        @title_ids << title.id
+        next
+      end
+      if is_supported_file path
+        entry = Entry.new path, self
+        @entries << entry if entry.pages > 0 || entry.err_msg
+      end
+    end
+
+    mtimes = [@mtime]
+    mtimes += @title_ids.map { |e| Library.default.title_hash[e].mtime }
+    mtimes += @entries.map &.mtime
+    @mtime = mtimes.max
+
+    @title_ids.sort! do |a, b|
+      compare_numerically Library.default.title_hash[a].title,
+        Library.default.title_hash[b].title
+    end
+    sorter = ChapterSorter.new @entries.map &.title
+    @entries.sort! do |a, b|
+      sorter.compare a.sort_title, b.sort_title
+    end
+  end
+
+  # Utility method used in library rescanning.
+  # - When the title does not exist on the file system anymore, return false
+  #     and let it be deleted from the library instance
+  # - When the title exists, but its contents signature is now different from
+  #     the cache, it means some of its content (nested titles or entries)
+  #     has been added, deleted, or renamed. In this case we update its
+  #     contents signature and instance variables
+  # - When the title exists and its contents signature is still the same, we
+  #     return true so it can be reused without rescanning
+  def examine(context : ExamineContext) : Bool
+    return false unless Dir.exists? @dir
+    contents_signature = Dir.contents_signature @dir,
+      context["cached_contents_signature"]
+    return true if @contents_signature == contents_signature
+
+    @contents_signature = contents_signature
+    @signature = Dir.signature @dir
+    storage = Storage.default
+    id = storage.get_title_id dir, signature
+    if id.nil?
+      id = random_str
+      storage.insert_title_id({
+        path:      dir,
+        id:        id,
+        signature: signature.to_s,
+      })
+    end
+    @id = id
+    @mtime = File.info(@dir).modification_time
+
+    previous_titles_size = @title_ids.size
+    @title_ids.select! do |title_id|
+      title = Library.default.get_title title_id
+      unless title # for if data consistency broken
+        context["deleted_title_ids"].concat [title_id]
+        next false
+      end
+      existence = title.examine context
+      unless existence
+        context["deleted_title_ids"].concat [title_id] +
+                                            title.deep_titles.map &.id
+        context["deleted_entry_ids"].concat title.deep_entries.map &.id
+      end
+      existence
+    end
+    remained_title_dirs = @title_ids.map do |title_id|
+      title = Library.default.get_title! title_id
+      title.dir
+    end
+
+    previous_entries_size = @entries.size
+    @entries.select! do |entry|
+      existence = File.exists? entry.zip_path
+      Fiber.yield
+      context["deleted_entry_ids"] << entry.id unless existence
+      existence
+    end
+    remained_entry_zip_paths = @entries.map &.zip_path
+
+    is_titles_added = false
+    is_entries_added = false
+    Dir.entries(dir).each do |fn|
+      next if fn.starts_with? "."
+      path = File.join dir, fn
+      if File.directory? path
+        next if remained_title_dirs.includes? path
+        title = Title.new path, @id, context["cached_contents_signature"]
+        next if title.entries.size == 0 && title.titles.size == 0
+        Library.default.title_hash[title.id] = title
+        @title_ids << title.id
+        is_titles_added = true
+
+        # We think they are removed, but they are here!
+        # Cancel reserved jobs
+        revival_title_ids = [title.id] + title.deep_titles.map &.id
+        context["deleted_title_ids"].select! do |deleted_title_id|
+          !(revival_title_ids.includes? deleted_title_id)
+        end
+        revival_entry_ids = title.deep_entries.map &.id
+        context["deleted_entry_ids"].select! do |deleted_entry_id|
+          !(revival_entry_ids.includes? deleted_entry_id)
+        end
+
+        next
+      end
+      if is_supported_file path
+        next if remained_entry_zip_paths.includes? path
+        entry = Entry.new path, self
+        if entry.pages > 0 || entry.err_msg
+          @entries << entry
+          is_entries_added = true
+          context["deleted_entry_ids"].select! do |deleted_entry_id|
+            entry.id != deleted_entry_id
+          end
+        end
+      end
+    end
+
+    mtimes = [@mtime]
+    mtimes += @title_ids.map { |e| Library.default.title_hash[e].mtime }
+    mtimes += @entries.map &.mtime
+    @mtime = mtimes.max
+
+    if is_titles_added || previous_titles_size != @title_ids.size
+      @title_ids.sort! do |a, b|
+        compare_numerically Library.default.title_hash[a].title,
+          Library.default.title_hash[b].title
+      end
+    end
+    if is_entries_added || previous_entries_size != @entries.size
+      sorter = ChapterSorter.new @entries.map &.sort_title
+      @entries.sort! do |a, b|
+        sorter.compare a.sort_title, b.sort_title
+      end
+    end
+
+    if @title_ids.size > 0 || @entries.size > 0
+      true
+    else
+      context["deleted_title_ids"].concat [@id]
+      false
+    end
+  end
+
+  alias SortContext = NamedTuple(username: String, opt: SortOptions)
+
+  def build_json(*, slim = false, depth = -1,
+                 sort_context : SortContext? = nil,
+                 percentage = false)
+    _titles = if sort_context
+                sorted_titles sort_context[:username],
+                  sort_context[:opt]
+              else
+                self.titles
+              end
+    _entries = if sort_context
+                 sorted_entries sort_context[:username],
+                   sort_context[:opt]
+               else
+                 @entries
+               end
+
+    JSON.build do |json|
+      json.object do
+        {% for str in ["dir", "title", "id"] %}
+        json.field {{str}}, @{{str.id}}
+      {% end %}
+        json.field "signature" { json.number @signature }
+        json.field "sort_title", sort_title
+        unless slim
+          json.field "display_name", display_name
+          json.field "cover_url", cover_url
+          json.field "mtime" { json.number @mtime.to_unix }
+        end
+        unless depth == 0
+          json.field "titles" do
+            json.array do
+              _titles.each do |title|
+                json.raw title.build_json(slim: slim,
+                  depth: depth > 0 ? depth - 1 : depth,
+                  sort_context: sort_context, percentage: percentage)
+              end
+            end
+          end
+          json.field "entries" do
+            json.array do
+              _entries.each do |entry|
+                json.raw entry.build_json(slim: slim)
+              end
+            end
+          end
+          if percentage && sort_context
+            json.field "title_percentages" do
+              json.array do
+                _titles.each do |t|
+                  json.number t.load_percentage sort_context[:username]
+                end
+              end
+            end
+            json.field "entry_percentages" do
+              json.array do
+                load_percentage_for_all_entries(
+                  sort_context[:username],
+                  sort_context[:opt]
+                ).each do |p|
+                  json.number p.nan? ? 0 : p
+                end
+              end
+            end
+          end
+        end
+        json.field "parents" do
+          json.array do
+            self.parents.each do |title|
+              json.object do
+                json.field "title", title.title
+                json.field "id", title.id
+              end
+            end
+          end
+        end
+      end
+    end
+  end
+
+  def titles
+    @title_ids.map { |tid| Library.default.get_title! tid }
+  end
+
+  def sorted_titles(username, opt : SortOptions? = nil)
+    if opt.nil?
+      opt = SortOptions.from_info_json @dir, username
+    end
+
+    # Helper function from src/util/util.cr
+    sort_titles titles, opt.not_nil!, username
+  end
+
+  # Get all entries, including entries in nested titles
+  def deep_entries
+    return @entries if title_ids.empty?
+    @entries + titles.flat_map &.deep_entries
+  end
+
+  def deep_titles
+    return [] of Title if titles.empty?
+    titles + titles.flat_map &.deep_titles
+  end
+
+  def parents
+    ary = [] of Title
+    tid = @parent_id
+    while !tid.empty?
+      title = Library.default.get_title! tid
+      ary << title
+      tid = title.parent_id
+    end
+    ary.reverse
+  end
+
+  # Returns a string the describes the content of the title
+  #   e.g., - 3 titles and 1 entry
+  #         - 4 entries
+  #         - 1 title
+  def content_label
+    ary = [] of String
+    tsize = titles.size
+    esize = entries.size
+
+    ary << "#{tsize} #{tsize > 1 ? "titles" : "title"}" if tsize > 0
+    ary << "#{esize} #{esize > 1 ? "entries" : "entry"}" if esize > 0
+    ary.join " and "
+  end
+
+  def sort_title
+    sort_title_cached = @sort_title
+    return sort_title_cached if sort_title_cached
+    sort_title = Storage.default.get_title_sort_title id
+    if sort_title
+      @sort_title = sort_title
+      return sort_title
+    end
+    @sort_title = @title
+    @title
+  end
+
+  def set_sort_title(sort_title : String | Nil, username : String)
+    Storage.default.set_title_sort_title id, sort_title
+    if sort_title == "" || sort_title.nil?
+      @sort_title = nil
+    else
+      @sort_title = sort_title
+    end
+
+    if parents.size > 0
+      target = parents[-1].titles
+    else
+      target = Library.default.titles
+    end
+    remove_sorted_titles_cache target,
+      [SortMethod::Auto, SortMethod::Title], username
+  end
+
+  def sort_title_db
+    Storage.default.get_title_sort_title id
+  end
+
+  def entry_sort_title_db(entry_id)
+    unless @entry_sort_title_cache
+      @entry_sort_title_cache =
+        Storage.default.get_entries_sort_title @entries.map &.id
+    end
+
+    @entry_sort_title_cache.not_nil![entry_id]?
+  end
+
+  def tags
+    Storage.default.get_title_tags @id
+  end
+
+  def add_tag(tag)
+    Storage.default.add_tag @id, tag
+  end
+
+  def delete_tag(tag)
+    Storage.default.delete_tag @id, tag
+  end
+
+  def get_entry(eid)
+    @entries.find &.id.== eid
+  end
+
+  def display_name
+    cached_display_name = @cached_display_name
+    return cached_display_name unless cached_display_name.nil?
+
+    dn = @title
+    TitleInfo.new @dir do |info|
+      info_dn = info.display_name
+      dn = info_dn unless info_dn.empty?
+    end
+    @cached_display_name = dn
+    dn
+  end
+
+  def encoded_display_name
+    URI.encode display_name
+  end
+
+  def display_name(entry_name)
+    unless @entry_display_name_cache
+      TitleInfo.new @dir do |info|
+        @entry_display_name_cache = info.entry_display_name
+      end
+    end
+
+    dn = entry_name
+    info_dn = @entry_display_name_cache.not_nil![entry_name]?
+    unless info_dn.nil? || info_dn.empty?
+      dn = info_dn
+    end
+    dn
+  end
+
+  def set_display_name(dn)
+    @cached_display_name = dn
+    TitleInfo.new @dir do |info|
+      info.display_name = dn
+      info.save
+    end
+  end
+
+  def set_display_name(entry_name : String, dn)
+    TitleInfo.new @dir do |info|
+      info.entry_display_name[entry_name] = dn
+      @entry_display_name_cache = info.entry_display_name
+      info.save
+    end
+  end
+
+  def cover_url
+    cached_cover_url = @cached_cover_url
+    return cached_cover_url unless cached_cover_url.nil?
+
+    url = "#{Config.current.base_url}img/icons/icon_x192.png"
+    readable_entries = @entries.select &.err_msg.nil?
+    if readable_entries.size > 0
+      url = readable_entries[0].cover_url
+    end
+    TitleInfo.new @dir do |info|
+      info_url = info.cover_url
+      unless info_url.nil? || info_url.empty?
+        url = File.join Config.current.base_url, info_url
+      end
+    end
+    @cached_cover_url = url
+    url
+  end
+
+  def set_cover_url(url : String)
+    @cached_cover_url = url
+    TitleInfo.new @dir do |info|
+      info.cover_url = url
+      info.save
+    end
+  end
+
+  def set_cover_url(entry_name : String, url : String)
+    TitleInfo.new @dir do |info|
+      info.entry_cover_url[entry_name] = url
+      @entry_cover_url_cache = info.entry_cover_url
+      info.save
+    end
+  end
+
+  # Set the reading progress of all entries and nested libraries to 100%
+  def read_all(username)
+    @entries.each do |e|
+      e.save_progress username, e.pages
+    end
+    titles.each &.read_all username
+  end
+
+  # Set the reading progress of all entries and nested libraries to 0%
+  def unread_all(username)
+    @entries.each &.save_progress(username, 0)
+    titles.each &.unread_all username
+  end
+
+  def deep_read_page_count(username) : Int32
+    key = "#{@id}:#{username}:progress_sum"
+    sig = Digest::SHA1.hexdigest (entries.map &.id).to_s
+    cached_sum = LRUCache.get key
+    return cached_sum[1] if cached_sum.is_a? Tuple(String, Int32) &&
+                            cached_sum[0] == sig
+    sum = load_progress_for_all_entries(username, nil, true).sum +
+          titles.flat_map(&.deep_read_page_count username).sum
+    LRUCache.set generate_cache_entry key, {sig, sum}
+    sum
+  end
+
+  def deep_total_page_count : Int32
+    entries.sum(&.pages) +
+      titles.flat_map(&.deep_total_page_count).sum
+  end
+
+  def load_percentage(username)
+    deep_read_page_count(username) / deep_total_page_count
+  end
+
+  def load_progress_for_all_entries(username, opt : SortOptions? = nil,
+                                    unsorted = false)
+    progress = {} of String => Int32
+    TitleInfo.new @dir do |info|
+      progress = info.progress[username]?
+    end
+
+    if unsorted
+      ary = @entries
+    else
+      ary = sorted_entries username, opt
+    end
+
+    ary.map do |e|
+      info_progress = 0
+      if progress && progress.has_key? e.title
+        info_progress = [progress[e.title], e.pages].min
+      end
+      info_progress
+    end
+  end
+
+  def load_percentage_for_all_entries(username, opt : SortOptions? = nil,
+                                      unsorted = false)
+    if unsorted
+      ary = @entries
+    else
+      ary = sorted_entries username, opt
+    end
+
+    progress = load_progress_for_all_entries username, opt, unsorted
+    ary.map_with_index do |e, i|
+      progress[i] / e.pages
+    end
+  end
+
+  # Returns the sorted entries array
+  #
+  # When `opt` is nil, it uses the preferred sorting options in info.json, or
+  #   use the default (auto, ascending)
+  # When `opt` is not nil, it saves the options to info.json
+  def sorted_entries(username, opt : SortOptions? = nil)
+    cache_key = SortedEntriesCacheEntry.gen_key @id, username, @entries, opt
+    cached_entries = LRUCache.get cache_key
+    return cached_entries if cached_entries.is_a? Array(Entry)
+
+    if opt.nil?
+      opt = SortOptions.from_info_json @dir, username
+    end
+
+    case opt.not_nil!.method
+    when .title?
+      ary = @entries.sort do |a, b|
+        compare_numerically a.sort_title, b.sort_title
+      end
+    when .time_modified?
+      ary = @entries.sort { |a, b| (a.mtime <=> b.mtime).or \
+        compare_numerically a.sort_title, b.sort_title }
+    when .time_added?
+      ary = @entries.sort { |a, b| (a.date_added <=> b.date_added).or \
+        compare_numerically a.sort_title, b.sort_title }
+    when .progress?
+      percentage_ary = load_percentage_for_all_entries username, opt, true
+      ary = @entries.zip(percentage_ary)
+        .sort { |a_tp, b_tp| (a_tp[1] <=> b_tp[1]).or \
+          compare_numerically a_tp[0].sort_title, b_tp[0].sort_title }
+        .map &.[0]
+    else
+      unless opt.method.auto?
+        Logger.warn "Unknown sorting method #{opt.not_nil!.method}. Using " \
+                    "Auto instead"
+      end
+      sorter = ChapterSorter.new @entries.map &.sort_title
+      ary = @entries.sort do |a, b|
+        sorter.compare(a.sort_title, b.sort_title).or \
+          compare_numerically a.sort_title, b.sort_title
+      end
+    end
+
+    ary.reverse! unless opt.not_nil!.ascend
+
+    LRUCache.set generate_cache_entry cache_key, ary
+    ary
+  end
+
+  # === helper methods ===
+
+  # Gets the last read entry in the title. If the entry has been completed,
+  #   returns the next entry. Returns nil when no entry has been read yet,
+  #   or when all entries are completed
+  def get_last_read_entry(username) : Entry?
+    progress = {} of String => Int32
+    TitleInfo.new @dir do |info|
+      progress = info.progress[username]?
+    end
+    return if progress.nil?
+
+    last_read_entry = nil
+
+    sorted_entries(username).reverse_each do |e|
+      if progress.has_key?(e.title) && progress[e.title] > 0
+        last_read_entry = e
+        break
+      end
+    end
+
+    if last_read_entry && last_read_entry.finished? username
+      last_read_entry = last_read_entry.next_entry username
+    end
+
+    last_read_entry
+  end
+
+  # Equivalent to `@entries.map &. date_added`, but much more efficient
+  def get_date_added_for_all_entries
+    da = {} of String => Time
+    TitleInfo.new @dir do |info|
+      da = info.date_added
+    end
+
+    @entries.each do |e|
+      next if da.has_key? e.title
+      da[e.title] = ctime e.zip_path
+    end
+
+    TitleInfo.new @dir do |info|
+      info.date_added = da
+      info.save
+    end
+
+    @entries.map { |e| da[e.title] }
+  end
+
+  def deep_entries_with_date_added
+    da_ary = get_date_added_for_all_entries
+    zip = @entries.map_with_index do |e, i|
+      {entry: e, date_added: da_ary[i]}
+    end
+    return zip if title_ids.empty?
+    zip + titles.flat_map &.deep_entries_with_date_added
+  end
+
+  def remove_sorted_entries_cache(sort_methods : Array(SortMethod),
+                                  username : String)
+    [false, true].each do |ascend|
+      sort_methods.each do |sort_method|
+        sorted_entries_cache_key =
+          SortedEntriesCacheEntry.gen_key @id, username, @entries,
+            SortOptions.new(sort_method, ascend)
+        LRUCache.invalidate sorted_entries_cache_key
+      end
+    end
+  end
+
+  def remove_sorted_caches(sort_methods : Array(SortMethod), username : String)
+    remove_sorted_entries_cache sort_methods, username
+    parents.each do |parent|
+      remove_sorted_titles_cache parent.titles, sort_methods, username
+    end
+    remove_sorted_titles_cache Library.default.titles, sort_methods, username
+  end
+
+  def bulk_progress(action, ids : Array(String), username)
+    LRUCache.invalidate "#{@id}:#{username}:progress_sum"
+    parents.each do |parent|
+      LRUCache.invalidate "#{parent.id}:#{username}:progress_sum"
+    end
+    remove_sorted_caches [SortMethod::Progress], username
+
+    selected_entries = ids
+      .map { |id|
+        @entries.find &.id.==(id)
+      }
+      .select(Entry)
+
+    TitleInfo.new @dir do |info|
+      selected_entries.each do |e|
+        page = action == "read" ? e.pages : 0
+        if info.progress[username]?.nil?
+          info.progress[username] = {e.title => page}
+        else
+          info.progress[username][e.title] = page
+        end
+      end
+      info.save
+    end
+  end
+end

src/library/types.cr

@@ -0,0 +1,147 @@
+SUPPORTED_IMG_TYPES = %w(
+  image/jpeg
+  image/png
+  image/webp
+  image/apng
+  image/avif
+  image/gif
+  image/svg+xml
+)
+
+enum SortMethod
+  Auto
+  Title
+  Progress
+  TimeModified
+  TimeAdded
+end
+
+class SortOptions
+  property method : SortMethod, ascend : Bool
+
+  def initialize(in_method : String? = nil, @ascend = true)
+    @method = SortMethod::Auto
+    SortMethod.each do |m, _|
+      if in_method && m.to_s.underscore == in_method
+        @method = m
+        return
+      end
+    end
+  end
+
+  def initialize(in_method : SortMethod? = nil, @ascend = true)
+    if in_method
+      @method = in_method
+    else
+      @method = SortMethod::Auto
+    end
+  end
+
+  def self.from_tuple(tp : Tuple(String, Bool))
+    method, ascend = tp
+    self.new method, ascend
+  end
+
+  def self.from_info_json(dir, username)
+    opt = SortOptions.new
+    TitleInfo.new dir do |info|
+      if info.sort_by.has_key? username
+        opt = SortOptions.from_tuple info.sort_by[username]
+      end
+    end
+    opt
+  end
+
+  def to_tuple
+    {@method.to_s.underscore, ascend}
+  end
+
+  def to_json
+    {
+      "method" => method.to_s.underscore,
+      "ascend" => ascend,
+    }.to_json
+  end
+end
+
+struct Image
+  property data : Bytes
+  property mime : String
+  property filename : String
+  property size : Int32
+
+  def initialize(@data, @mime, @filename, @size)
+  end
+
+  def self.from_db(res : DB::ResultSet)
+    img = Image.allocate
+    res.read String
+    img.data = res.read Bytes
+    img.filename = res.read String
+    img.mime = res.read String
+    img.size = res.read Int32
+    img
+  end
+end
+
+class TitleInfo
+  include JSON::Serializable
+
+  property comment = "Generated by Mango. DO NOT EDIT!"
+  property progress = {} of String => Hash(String, Int32)
+  property display_name = ""
+  property entry_display_name = {} of String => String
+  property cover_url = ""
+  property entry_cover_url = {} of String => String
+  property last_read = {} of String => Hash(String, Time)
+  property date_added = {} of String => Time
+  property sort_by = {} of String => Tuple(String, Bool)
+
+  @[JSON::Field(ignore: true)]
+  property dir : String = ""
+
+  @@mutex_hash = {} of String => Mutex
+
+  def self.new(dir, &)
+    key = "#{dir}:info.json"
+    info = LRUCache.get key
+    if info.is_a? String
+      begin
+        instance = TitleInfo.from_json info
+        instance.dir = dir
+        yield instance
+        return
+      rescue
+      end
+    end
+
+    if @@mutex_hash[dir]?
+      mutex = @@mutex_hash[dir]
+    else
+      mutex = Mutex.new
+      @@mutex_hash[dir] = mutex
+    end
+    mutex.synchronize do
+      instance = TitleInfo.allocate
+      json_path = File.join dir, "info.json"
+      if File.exists? json_path
+        instance = TitleInfo.from_json File.read json_path
+      end
+      instance.dir = dir
+      LRUCache.set generate_cache_entry key, instance.to_json
+      yield instance
+    end
+  end
+
+  def save
+    json_path = File.join @dir, "info.json"
+    File.write json_path, self.to_pretty_json
+    key = "#{@dir}:info.json"
+    LRUCache.set generate_cache_entry key, self.to_json
+  end
+end
+
+alias ExamineContext = NamedTuple(
+  cached_contents_signature: Hash(String, String),
+  deleted_title_ids: Array(String),
+  deleted_entry_ids: Array(String))

src/log_handler.cr

@@ -1,26 +0,0 @@
-require "kemal"
-require "./logger"
-
-class LogHandler < Kemal::BaseLogHandler
-	def initialize(@logger : MLogger)
-	end
-
-	def call(env)
-		elapsed_time = Time.measure { call_next env }
-		elapsed_text = elapsed_text elapsed_time
-		msg = "#{env.response.status_code} #{env.request.method}" \
-			" #{env.request.resource} #{elapsed_text}"
-		@logger.debug(msg)
-		env
-	end
-
-	def write(msg)
-		@logger.debug(msg)
-	end
-
-	private def elapsed_text(elapsed)
-		millis = elapsed.total_milliseconds
-		return "#{millis.round(2)}ms" if millis >= 1
-		"#{(millis * 1000).round(2)}µs"
-	end
-end

src/logger.cr

@@ -1,59 +1,80 @@
-require "./config"
-require "logger"
+require "log"
 require "colorize"
 
-LEVELS = ["debug", "error", "fatal", "info", "warn"]
-COLORS = [:light_cyan, :light_red, :red, :light_yellow, :light_magenta]
+class Logger
+  LEVELS       = ["debug", "error", "fatal", "info", "warn"]
+  SEVERITY_IDS = [0, 4, 5, 2, 3]
+  COLORS       = [:light_cyan, :light_red, :red, :light_yellow, :light_magenta]
 
-class MLogger
-	def initialize(config : Config)
-		@logger = Logger.new STDOUT
+  getter raw_log = Log.for ""
 
-		@log_off = false
-		log_level = config.log_level
-		if log_level == "off"
-			@log_off = true
-			return
-		end
+  @@severity : Log::Severity = :info
 
-		{% begin %}
-			case log_level
-				{% for lvl in LEVELS %}
-				when {{lvl}}
-					@logger.level = Logger::{{lvl.upcase.id}}
-				{% end %}
-			else
-				raise "Unknown log level #{log_level}"
-			end
-		{% end %}
+  use_default
 
-		@logger.formatter = Logger::Formatter.new do \
-			|severity, datetime, progname, message, io|
+  def initialize
+    @@severity = Logger.get_severity
+    @backend = Log::IOBackend.new
 
-			color = :default
-			{% begin %}
-				case severity.to_s().downcase
-					{% for lvl, i in LEVELS %}
-					when {{lvl}}
-						color = COLORS[{{i}}]
-					{% end %}
-				end
-			{% end %}
+    format_proc = ->(entry : Log::Entry, io : IO) do
+      color = :default
+      {% begin %}
+        case entry.severity.label.to_s().downcase
+          {% for lvl, i in LEVELS %}
+          when {{lvl}}, "#{{{lvl}}}ing"
+            color = COLORS[{{i}}]
+          {% end %}
+        else
+        end
+      {% end %}
 
-			io << "[#{severity}]".ljust(8).colorize(color)
-			io << datetime.to_s("%Y/%m/%d %H:%M:%S") << " | "
-			io << message
-		end
-	end
+      io << "[#{entry.severity.label}]".ljust(10).colorize(color)
+      io << entry.timestamp.to_s("%Y/%m/%d %H:%M:%S") << " | "
+      io << entry.message
+    end
 
-	{% for lvl in LEVELS %}
-		def {{lvl.id}}(msg)
-			return if @log_off
-			@logger.{{lvl.id}} msg
-		end
-	{% end %}
+    @backend.formatter = Log::Formatter.new &format_proc
 
-	def to_json(json : JSON::Builder)
-		json.string self
-	end
+    Log.setup do |c|
+      c.bind "*", @@severity, @backend
+      c.bind "db.*", :error, @backend
+    end
+  end
+
+  def self.get_severity(level = "") : Log::Severity
+    if level.empty?
+      level = Config.current.log_level
+    end
+    {% begin %}
+      case level.downcase
+      when "off"
+        return Log::Severity::None
+        {% for lvl, i in LEVELS %}
+          when {{lvl}}
+          return Log::Severity.new SEVERITY_IDS[{{i}}]
+        {% end %}
+      else
+        raise "Unknown log level #{level}"
+      end
+    {% end %}
+  end
+
+  # Ignores @@severity and always log msg
+  def log(msg)
+    @backend.write Log::Entry.new "", Log::Severity::None, msg,
+      Log::Metadata.empty, nil
+  end
+
+  def self.log(msg)
+    default.log msg
+  end
+
+  {% for lvl in LEVELS %}
+    def {{lvl.id}}(msg)
+      raw_log.{{lvl.id}} { msg }
+    end
+    def self.{{lvl.id}}(msg)
+      default.not_nil!.{{lvl.id}} msg
+    end
+  {% end %}
 end

src/main_fiber.cr

@@ -0,0 +1,34 @@
+# On ARM, connecting to the SQLite DB from a spawned fiber would crash
+#   https://github.com/crystal-lang/crystal-sqlite3/issues/30
+# This is a temporary workaround that forces the relevant code to run in the
+#   main fiber
+
+class MainFiber
+  @@channel = Channel(-> Nil).new
+  @@done = Channel(Bool).new
+  @@main_fiber = Fiber.current
+
+  def self.start_and_block
+    loop do
+      if proc = @@channel.receive
+        begin
+          proc.call
+        ensure
+          @@done.send true
+        end
+      end
+      Fiber.yield
+    end
+  end
+
+  def self.run(&block : -> Nil)
+    if @@main_fiber == Fiber.current
+      block.call
+    else
+      @@channel.send block
+      until @@done.receive
+        Fiber.yield
+      end
+    end
+  end
+end

src/mango.cr

@@ -1,34 +1,138 @@
+require "./config"
+require "./queue"
 require "./server"
-require "./context"
+require "./main_fiber"
+require "./plugin/*"
 require "option_parser"
+require "clim"
+require "tallboy"
 
-VERSION = "0.1.2"
+MANGO_VERSION = "0.25.0"
 
-config_path = nil
+# From http://www.network-science.de/ascii/
+BANNER = %{
 
-parser = OptionParser.parse do |parser|
-	parser.banner = "Mango e-manga server/reader. Version #{VERSION}\n"
+              _|      _|
+              _|_|  _|_|    _|_|_|  _|_|_|      _|_|_|    _|_|
+              _|  _|  _|  _|    _|  _|    _|  _|    _|  _|    _|
+              _|      _|  _|    _|  _|    _|  _|    _|  _|    _|
+              _|      _|    _|_|_|  _|    _|    _|_|_|    _|_|
+                                                    _|
+                                                _|_|
 
-	parser.on "-v", "--version", "Show version" do
-		puts "Version #{VERSION}"
-		exit
-	end
-	parser.on "-h", "--help", "Show help" do
-		puts parser
-		exit
-	end
-	parser.on "-c PATH", "--config=PATH", "Path to the config file. " \
-		"Default is `~/.config/mango/config.yml`" do |path|
-		config_path = path
-	end
+
+}
+
+DESCRIPTION = "Mango - Manga Server and Web Reader. Version #{MANGO_VERSION}"
+
+macro common_option
+  option "-c PATH", "--config=PATH", type: String,
+    desc: "Path to the config file"
 end
 
-config = Config.load config_path
-logger = MLogger.new config
-storage = Storage.new config.db_path, logger
-library = Library.new config.library_path, config.scan_interval, logger, storage
+macro throw(msg)
+  puts "ERROR: #{{{msg}}}"
+  puts
+  puts "Please see the `--help`."
+  exit 1
+end
 
-context = Context.new config, logger, library, storage
+class CLI < Clim
+  main do
+    desc DESCRIPTION
+    usage "mango [sub_command] [options]"
+    help short: "-h"
+    version "Version #{MANGO_VERSION}", short: "-v"
+    common_option
+    run do |opts|
+      puts BANNER
+      puts DESCRIPTION
+      puts
 
-server = Server.new context
-server.start
+      # empty ARGV so it won't be passed to Kemal
+      ARGV.clear
+
+      Config.load(opts.config).set_current
+
+      # Initialize main components
+      LRUCache.init
+      Storage.default
+      Queue.default
+      Library.load_instance
+      Library.default
+      Plugin::Downloader.default
+      Plugin::Updater.default
+
+      spawn do
+        begin
+          Server.new.start
+        rescue e
+          Logger.fatal e
+          Process.exit 1
+        end
+      end
+
+      MainFiber.start_and_block
+    end
+
+    sub "admin" do
+      desc "Run admin tools"
+      usage "mango admin [tool]"
+      help short: "-h"
+      run do |opts|
+        puts opts.help_string
+      end
+      sub "user" do
+        desc "User management tool"
+        usage "mango admin user [arguments] [options]"
+        help short: "-h"
+        argument "action", type: String,
+          desc: "Action to perform. Can be add/delete/update/list"
+        argument "username", type: String,
+          desc: "Username to update or delete"
+        option "-u USERNAME", "--username=USERNAME", type: String,
+          desc: "Username"
+        option "-p PASSWORD", "--password=PASSWORD", type: String,
+          desc: "Password"
+        option "-a", "--admin", desc: "Admin flag", type: Bool, default: false
+        common_option
+        run do |opts, args|
+          Config.load(opts.config).set_current
+          storage = Storage.new nil, false
+
+          case args.action
+          when "add"
+            throw "Options `-u` and `-p` required." if opts.username.nil? ||
+                                                       opts.password.nil?
+            storage.new_user opts.username.not_nil!,
+              opts.password.not_nil!, opts.admin
+          when "delete"
+            throw "Argument `username` required." if args.username.nil?
+            storage.delete_user args.username
+          when "update"
+            throw "Argument `username` required." if args.username.nil?
+            username = opts.username || args.username
+            password = opts.password || ""
+            storage.update_user args.username, username.not_nil!,
+              password.not_nil!, opts.admin
+          when "list"
+            users = storage.list_users
+            table = Tallboy.table do
+              header ["username", "admin access"]
+              users.each do |name, admin|
+                row [name, admin]
+              end
+            end
+            puts table
+          when nil
+            puts opts.help_string
+          else
+            throw "Unknown action \"#{args.action}\"."
+          end
+        end
+      end
+    end
+  end
+end
+
+CLI.start(ARGV)

src/plugin/downloader.cr

@@ -0,0 +1,136 @@
+class Plugin
+  class Downloader < Queue::Downloader
+    use_default
+
+    def initialize
+      super
+    end
+
+    def pop : Queue::Job?
+      job = nil
+      MainFiber.run do
+        DB.open "sqlite3://#{@queue.path}" do |db|
+          begin
+            db.query_one "select * from queue where id like '%-%' " \
+                         "and (status = 0 or status = 1) " \
+                         "order by time limit 1" do |res|
+              job = Queue::Job.from_query_result res
+            end
+          rescue
+          end
+        end
+      end
+      job
+    end
+
+    private def download(job : Queue::Job)
+      @downloading = true
+      @queue.set_status Queue::JobStatus::Downloading, job
+
+      begin
+        unless job.plugin_id
+          raise "Job does not have a plugin ID specificed"
+        end
+
+        plugin = Plugin.new job.plugin_id.not_nil!
+        info = plugin.select_chapter job.plugin_chapter_id.not_nil!
+
+        pages = info["pages"].as_i
+
+        manga_title = sanitize_filename job.manga_title
+        chapter_title = sanitize_filename info["title"].as_s
+
+        @queue.set_pages pages, job
+        lib_dir = @library_path
+        manga_dir = File.join lib_dir, manga_title
+        unless File.exists? manga_dir
+          Dir.mkdir_p manga_dir
+        end
+
+        zip_path = File.join manga_dir, "#{chapter_title}.cbz.part"
+        writer = Compress::Zip::Writer.new zip_path
+      rescue e
+        @queue.set_status Queue::JobStatus::Error, job
+        unless e.message.nil?
+          @queue.add_message e.message.not_nil!, job
+        end
+        @downloading = false
+        raise e
+      end
+
+      fail_count = 0
+
+      while page = plugin.next_page
+        break unless @queue.exists? job
+
+        fn = sanitize_filename page["filename"].as_s
+        url = page["url"].as_s
+        headers = HTTP::Headers.new
+
+        if page["headers"]?
+          page["headers"].as_h.each do |k, v|
+            headers.add k, v.as_s
+          end
+        end
+
+        page_success = false
+        tries = 4
+
+        loop do
+          sleep plugin.info.wait_seconds.seconds
+          Logger.debug "downloading #{url}"
+          tries -= 1
+
+          begin
+            HTTP::Client.get url, headers do |res|
+              unless res.success?
+                raise "Failed to download page #{url}. " \
+                      "[#{res.status_code}] #{res.status_message}"
+              end
+              writer.add fn, res.body_io
+            end
+          rescue e
+            @queue.add_fail job
+            fail_count += 1
+            msg = "Failed to download page #{url}. Error: #{e}"
+            @queue.add_message msg, job
+            Logger.error msg
+            Logger.debug "[failed] #{url}"
+          else
+            @queue.add_success job
+            Logger.debug "[success] #{url}"
+            page_success = true
+          end
+
+          break if page_success || tries < 0
+        end
+      end
+
+      unless @queue.exists? job
+        Logger.debug "Download cancelled"
+        @downloading = false
+        return
+      end
+
+      Logger.debug "Download completed. #{fail_count}/#{pages} failed"
+      writer.close
+      filename = File.join File.dirname(zip_path), File.basename(zip_path,
+        ".part")
+      File.rename zip_path, filename
+      Logger.debug "cbz File created at #{filename}"
+
+      zip_exception = validate_archive filename
+      if !zip_exception.nil?
+        @queue.add_message "The downloaded archive is corrupted. " \
+                           "Error: #{zip_exception}", job
+        @queue.set_status Queue::JobStatus::Error, job
+      elsif fail_count > 0
+        @queue.set_status Queue::JobStatus::MissingPages, job
+      else
+        @queue.set_status Queue::JobStatus::Completed, job
+      end
+
+      @downloading = false
+    end
+  end
+end

src/plugin/plugin.cr

@@ -0,0 +1,519 @@
+require "duktape/runtime"
+require "myhtml"
+require "xml"
+
+require "./subscriptions"
+
+class Plugin
+  class Error < ::Exception
+  end
+
+  class MetadataError < Error
+  end
+
+  class PluginException < Error
+  end
+
+  class SyntaxError < Error
+  end
+
+  struct Info
+    include JSON::Serializable
+
+    {% for name in ["id", "title", "placeholder"] %}
+      getter {{name.id}} = ""
+    {% end %}
+    getter wait_seconds = 0u64
+    getter version = 0u64
+    getter settings = {} of String => String?
+    getter dir : String
+
+    @[JSON::Field(ignore: true)]
+    @json : JSON::Any
+
+    def initialize(@dir)
+      info_path = File.join @dir, "info.json"
+
+      unless File.exists? info_path
+        raise MetadataError.new "File `info.json` not found in the " \
+                                "plugin directory #{dir}"
+      end
+
+      @json = JSON.parse File.read info_path
+
+      begin
+        {% for name in ["id", "title", "placeholder"] %}
+          @{{name.id}} = @json[{{name}}].as_s
+        {% end %}
+        @wait_seconds = @json["wait_seconds"].as_i.to_u64
+        @version = @json["api_version"]?.try(&.as_i.to_u64) || 1u64
+
+        if @version > 1 && (settings_hash = @json["settings"]?.try &.as_h?)
+          settings_hash.each do |k, v|
+            unless str_value = v.as_s?
+              raise "The settings object can only contain strings or null"
+            end
+            @settings[k] = str_value
+          end
+        end
+
+        unless @id.alphanumeric_underscore?
+          raise "Plugin ID can only contain alphanumeric characters and " \
+                "underscores"
+        end
+      rescue e
+        raise MetadataError.new "Failed to retrieve metadata from plugin " \
+                                "at #{@dir}. Error: #{e.message}"
+      end
+    end
+
+    def each(&block : String, JSON::Any -> _)
+      @json.as_h.each &block
+    end
+  end
+
+  struct Storage
+    @hash = {} of String => String
+
+    def initialize(@path : String)
+      unless File.exists? @path
+        save
+      end
+
+      json = JSON.parse File.read @path
+      json.as_h.each do |k, v|
+        @hash[k] = v.as_s
+      end
+    end
+
+    def []?(key)
+      @hash[key]?
+    end
+
+    def []=(key, val : String)
+      @hash[key] = val
+    end
+
+    def save
+      File.write @path, @hash.to_pretty_json
+    end
+  end
+
+  @@info_ary = [] of Info
+  @info : Info?
+
+  getter js_path = ""
+  getter storage_path = ""
+
+  def self.build_info_ary
+    @@info_ary.clear
+    dir = Config.current.plugin_path
+    Dir.mkdir_p dir unless Dir.exists? dir
+
+    Dir.each_child dir do |f|
+      path = File.join dir, f
+      next unless File.directory? path
+
+      begin
+        @@info_ary << Info.new path
+      rescue e : MetadataError
+        Logger.warn e
+      end
+    end
+  end
+
+  def self.list
+    self.build_info_ary
+    @@info_ary.map do |m|
+      {id: m.id, title: m.title}
+    end
+  end
+
+  def info
+    @info.not_nil!
+  end
+
+  def subscribe(subscription : Subscription)
+    list = SubscriptionList.new info.dir
+    list << subscription
+    list.save
+  end
+
+  def list_subscriptions
+    SubscriptionList.new(info.dir).ary
+  end
+
+  def list_subscriptions_raw
+    SubscriptionList.new(info.dir)
+  end
+
+  def unsubscribe(id : String)
+    list = SubscriptionList.new info.dir
+    list.reject! &.id.== id
+    list.save
+  end
+
+  def check_subscription(id : String)
+    list = list_subscriptions_raw
+    sub = list.find &.id.== id
+    Plugin::Updater.default.check_subscription self, sub.not_nil!
+    list.save
+  end
+
+  def initialize(id : String)
+    Plugin.build_info_ary
+
+    @info = @@info_ary.find &.id.== id
+    if @info.nil?
+      raise Error.new "Plugin with ID #{id} not found"
+    end
+
+    @js_path = File.join info.dir, "index.js"
+    @storage_path = File.join info.dir, "storage.json"
+
+    unless File.exists? @js_path
+      raise Error.new "Plugin script not found at #{@js_path}"
+    end
+
+    @rt = Duktape::Runtime.new do |sbx|
+      sbx.push_global_object
+
+      sbx.push_pointer @storage_path.as(Void*)
+      path = sbx.require_pointer(-1).as String
+      sbx.pop
+      sbx.push_string path
+      sbx.put_prop_string -2, "storage_path"
+
+      sbx.push_pointer info.dir.as(Void*)
+      path = sbx.require_pointer(-1).as String
+      sbx.pop
+      sbx.push_string path
+      sbx.put_prop_string -2, "info_dir"
+
+      def_helper_functions sbx
+    end
+
+    eval File.read @js_path
+  end
+
+  macro check_fields(ary)
+    {% for field in ary %}
+      unless json[{{field}}]?
+        raise "Field `{{field.id}}` is missing from the function outputs"
+      end
+    {% end %}
+  end
+
+  def assert_manga_type(obj : JSON::Any)
+    obj["id"].as_s && obj["title"].as_s
+  rescue e
+    raise Error.new "Missing required fields in the Manga type"
+  end
+
+  def assert_chapter_type(obj : JSON::Any)
+    obj["id"].as_s && obj["title"].as_s && obj["pages"].as_i &&
+      obj["manga_title"].as_s
+  rescue e
+    raise Error.new "Missing required fields in the Chapter type"
+  end
+
+  def assert_page_type(obj : JSON::Any)
+    obj["url"].as_s && obj["filename"].as_s
+  rescue e
+    raise Error.new "Missing required fields in the Page type"
+  end
+
+  def search_manga(query : String)
+    if info.version == 1
+      raise Error.new "Manga searching is only available for plugins " \
+                      "targeting API v2 or above"
+    end
+    json = eval_json "searchManga('#{query}')"
+    begin
+      json.as_a.each do |obj|
+        assert_manga_type obj
+      end
+    rescue e
+      raise Error.new e.message
+    end
+    json
+  end
+
+  def list_chapters(query : String)
+    json = eval_json "listChapters('#{query}')"
+    begin
+      if info.version > 1
+        # Since v2, listChapters returns an array
+        json.as_a.each do |obj|
+          assert_chapter_type obj
+        end
+      else
+        check_fields ["title", "chapters"]
+
+        ary = json["chapters"].as_a
+        ary.each do |obj|
+          id = obj["id"]?
+          raise "Field `id` missing from `listChapters` outputs" if id.nil?
+
+          unless id.to_s.alphanumeric_underscore?
+            raise "The `id` field can only contain alphanumeric characters " \
+                  "and underscores"
+          end
+
+          title = obj["title"]?
+          if title.nil?
+            raise "Field `title` missing from `listChapters` outputs"
+          end
+        end
+      end
+    rescue e
+      raise Error.new e.message
+    end
+    json
+  end
+
+  def select_chapter(id : String)
+    json = eval_json "selectChapter('#{id}')"
+    begin
+      if info.version > 1
+        assert_chapter_type json
+      else
+        check_fields ["title", "pages"]
+
+        if json["title"].to_s.empty?
+          raise "The `title` field of the chapter can not be empty"
+        end
+      end
+    rescue e
+      raise Error.new e.message
+    end
+    json
+  end
+
+  def next_page
+    json = eval_json "nextPage()"
+    return if json.size == 0
+    begin
+      assert_page_type json
+    rescue e
+      raise Error.new e.message
+    end
+    json
+  end
+
+  def new_chapters(manga_id : String, after : Int64)
+    # Converting standard timestamp to milliseconds so plugins can easily do
+    #   `new Date(ms_timestamp)` in JS.
+    json = eval_json "newChapters('#{manga_id}', #{after * 1000})"
+    begin
+      json.as_a.each do |obj|
+        assert_chapter_type obj
+      end
+    rescue e
+      raise Error.new e.message
+    end
+    json
+  end
+
+  private def eval(str)
+    @rt.eval str
+  rescue e : Duktape::SyntaxError
+    raise SyntaxError.new e.message
+  rescue e : Duktape::Error
+    raise Error.new e.message
+  end
+
+  private def eval_json(str)
+    JSON.parse eval(str).as String
+  end
+
+  private def def_helper_functions(sbx)
+    sbx.push_object
+
+    sbx.push_proc LibDUK::VARARGS do |ptr|
+      env = Duktape::Sandbox.new ptr
+      url = env.require_string 0
+
+      headers = HTTP::Headers.new
+
+      if env.get_top == 2
+        env.enum 1, LibDUK::Enum::OwnPropertiesOnly
+        while env.next -1, true
+          key = env.require_string -2
+          val = env.require_string -1
+          headers.add key, val
+          env.pop_2
+        end
+      end
+
+      res = HTTP::Client.get url, headers
+
+      env.push_object
+
+      env.push_int res.status_code
+      env.put_prop_string -2, "status_code"
+
+      env.push_string res.body
+      env.put_prop_string -2, "body"
+
+      env.push_object
+      res.headers.each do |k, v|
+        if v.size == 1
+          env.push_string v[0]
+        else
+          env.push_string v.join ","
+        end
+        env.put_prop_string -2, k
+      end
+      env.put_prop_string -2, "headers"
+
+      env.call_success
+    end
+    sbx.put_prop_string -2, "get"
+
+    sbx.push_proc LibDUK::VARARGS do |ptr|
+      env = Duktape::Sandbox.new ptr
+      url = env.require_string 0
+      body = env.require_string 1
+
+      headers = HTTP::Headers.new
+
+      if env.get_top == 3
+        env.enum 2, LibDUK::Enum::OwnPropertiesOnly
+        while env.next -1, true
+          key = env.require_string -2
+          val = env.require_string -1
+          headers.add key, val
+          env.pop_2
+        end
+      end
+
+      res = HTTP::Client.post url, headers, body
+
+      env.push_object
+
+      env.push_int res.status_code
+      env.put_prop_string -2, "status_code"
+
+      env.push_string res.body
+      env.put_prop_string -2, "body"
+
+      env.push_object
+      res.headers.each do |k, v|
+        if v.size == 1
+          env.push_string v[0]
+        else
+          env.push_string v.join ","
+        end
+        env.put_prop_string -2, k
+      end
+      env.put_prop_string -2, "headers"
+
+      env.call_success
+    end
+    sbx.put_prop_string -2, "post"
+
+    sbx.push_proc 2 do |ptr|
+      env = Duktape::Sandbox.new ptr
+      html = env.require_string 0
+      selector = env.require_string 1
+
+      myhtml = Myhtml::Parser.new html
+      ary = myhtml.css(selector).map(&.to_html).to_a
+
+      ary_idx = env.push_array
+      ary.each_with_index do |str, i|
+        env.push_string str
+        env.put_prop_index ary_idx, i.to_u32
+      end
+
+      env.call_success
+    end
+    sbx.put_prop_string -2, "css"
+
+    sbx.push_proc 1 do |ptr|
+      env = Duktape::Sandbox.new ptr
+      html = env.require_string 0
+
+      str = XML.parse(html).inner_text
+
+      env.push_string str
+      env.call_success
+    end
+    sbx.put_prop_string -2, "text"
+
+    sbx.push_proc 2 do |ptr|
+      env = Duktape::Sandbox.new ptr
+      html = env.require_string 0
+      name = env.require_string 1
+
+      begin
+        attr = XML.parse(html).first_element_child.not_nil![name]
+        env.push_string attr
+      rescue
+        env.push_undefined
+      end
+
+      env.call_success
+    end
+    sbx.put_prop_string -2, "attribute"
+
+    sbx.push_proc 1 do |ptr|
+      env = Duktape::Sandbox.new ptr
+      msg = env.require_string 0
+      env.call_success
+
+      raise PluginException.new msg
+    end
+    sbx.put_prop_string -2, "raise"
+
+    sbx.push_proc LibDUK::VARARGS do |ptr|
+      env = Duktape::Sandbox.new ptr
+      key = env.require_string 0
+
+      env.get_global_string "storage_path"
+      storage_path = env.require_string -1
+      env.pop
+      storage = Storage.new storage_path
+
+      if env.get_top == 2
+        val = env.require_string 1
+        storage[key] = val
+        storage.save
+      else
+        val = storage[key]?
+        if val
+          env.push_string val
+        else
+          env.push_undefined
+        end
+      end
+
+      env.call_success
+    end
+    sbx.put_prop_string -2, "storage"
+
+    if info.version > 1
+      sbx.push_proc 1 do |ptr|
+        env = Duktape::Sandbox.new ptr
+        key = env.require_string 0
+
+        env.get_global_string "info_dir"
+        info_dir = env.require_string -1
+        env.pop
+        info = Info.new info_dir
+
+        if value = info.settings[key]?
+          env.push_string value
+        else
+          env.push_undefined
+        end
+
+        env.call_success
+      end
+      sbx.put_prop_string -2, "settings"
+    end
+
+    sbx.put_prop_string -2, "mango"
+  end
+end

src/plugin/subscriptions.cr

@@ -0,0 +1,115 @@
+require "uuid"
+require "big"
+
+enum FilterType
+  String
+  NumMin
+  NumMax
+  DateMin
+  DateMax
+  Array
+
+  def self.from_string(str)
+    case str
+    when "string"
+      String
+    when "number-min"
+      NumMin
+    when "number-max"
+      NumMax
+    when "date-min"
+      DateMin
+    when "date-max"
+      DateMax
+    when "array"
+      Array
+    else
+      raise "Unknown filter type with string #{str}"
+    end
+  end
+end
+
+struct Filter
+  include JSON::Serializable
+
+  property key : String
+  property value : String | Int32 | Int64 | Float32 | Nil
+  property type : FilterType
+
+  def initialize(@key, @value, @type)
+  end
+
+  def self.from_json(str) : Filter
+    json = JSON.parse str
+    key = json["key"].as_s
+    type = FilterType.from_string json["type"].as_s
+    _value = json["value"]
+    value = _value.as_s? || _value.as_i? || _value.as_i64? ||
+            _value.as_f32? || nil
+    self.new key, value, type
+  end
+
+  def match_chapter(obj : JSON::Any) : Bool
+    return true if value.nil? || value.to_s.empty?
+    raw_value = obj[key]
+    case type
+    when FilterType::String
+      raw_value.as_s.downcase == value.to_s.downcase
+    when FilterType::NumMin, FilterType::DateMin
+      BigFloat.new(raw_value.as_s) >= BigFloat.new value.not_nil!.to_f32
+    when FilterType::NumMax, FilterType::DateMax
+      BigFloat.new(raw_value.as_s) <= BigFloat.new value.not_nil!.to_f32
+    when FilterType::Array
+      return true if value == "all"
+      raw_value.as_s.downcase.split(",")
+        .map(&.strip).includes? value.to_s.downcase.strip
+    else
+      false
+    end
+  end
+end
+
+# We use class instead of struct so we can update `last_checked` from
+#   `SubscriptionList`
+class Subscription
+  include JSON::Serializable
+
+  property id : String
+  property plugin_id : String
+  property manga_id : String
+  property manga_title : String
+  property name : String
+  property created_at : Int64
+  property last_checked : Int64
+  property filters = [] of Filter
+
+  def initialize(@plugin_id, @manga_id, @manga_title, @name)
+    @id = UUID.random.to_s
+    @created_at = Time.utc.to_unix
+    @last_checked = Time.utc.to_unix
+  end
+
+  def match_chapter(obj : JSON::Any) : Bool
+    filters.all? &.match_chapter(obj)
+  end
+end
+
+struct SubscriptionList
+  @dir : String
+  @path : String
+
+  getter ary = [] of Subscription
+
+  forward_missing_to @ary
+
+  def initialize(@dir)
+    @path = Path[@dir, "subscriptions.json"].to_s
+    if File.exists? @path
+      @ary = Array(Subscription).from_json File.read @path
+    end
+  end
+
+  def save
+    File.write @path, @ary.to_pretty_json
+  end
+end

src/plugin/updater.cr

@@ -0,0 +1,75 @@
+class Plugin
+  class Updater
+    use_default
+
+    def initialize
+      interval = Config.current.plugin_update_interval_hours
+      return if interval <= 0
+      spawn do
+        loop do
+          Plugin.list.map(&.["id"]).each do |pid|
+            check_updates pid
+          end
+          sleep interval.hours
+        end
+      end
+    end
+
+    def check_updates(plugin_id : String)
+      Logger.debug "Checking plugin #{plugin_id} for updates"
+
+      plugin = Plugin.new plugin_id
+      if plugin.info.version == 1
+        Logger.debug "Plugin #{plugin_id} is targeting API version 1. " \
+                     "Skipping update check"
+        return
+      end
+
+      subscriptions = plugin.list_subscriptions_raw
+      subscriptions.each do |sub|
+        check_subscription plugin, sub
+      end
+      subscriptions.save
+    rescue e
+      Logger.error "Error checking plugin #{plugin_id} for updates: " \
+                   "#{e.message}"
+    end
+
+    def check_subscription(plugin : Plugin, sub : Subscription)
+      Logger.debug "Checking subscription #{sub.name} for updates"
+      matches = plugin.new_chapters(sub.manga_id, sub.last_checked)
+        .as_a.select do |chapter|
+        sub.match_chapter chapter
+      end
+      if matches.empty?
+        Logger.debug "No new chapters found."
+        sub.last_checked = Time.utc.to_unix
+        return
+      end
+      Logger.debug "Found #{matches.size} new chapters. " \
+                   "Pushing to download queue"
+      jobs = matches.map { |ch|
+        Queue::Job.new(
+          "#{plugin.info.id}-#{Base64.encode ch["id"].as_s}",
+          "", # manga_id
+          ch["title"].as_s,
+          sub.manga_title,
+          Queue::JobStatus::Pending,
+          Time.utc
+        )
+      }
+      inserted_count = Queue.default.push jobs
+      Logger.info "#{inserted_count}/#{matches.size} new chapters added " \
+                  "to the download queue. Plugin ID #{plugin.info.id}, " \
+                  "subscription name #{sub.name}"
+      if inserted_count != matches.size
+        Logger.error "Failed to add #{matches.size - inserted_count} " \
+                     "chapters to download queue"
+      end
+      sub.last_checked = Time.utc.to_unix
+    rescue e
+      Logger.error "Error when checking updates for subscription " \
+                   "#{sub.name}: #{e.message}"
+    end
+  end
+end

src/queue.cr

@@ -0,0 +1,324 @@
+require "sqlite3"
+require "./util/*"
+
+class Queue
+  abstract class Downloader
+    property stopped = false
+    @library_path : String = Config.current.library_path
+    @downloading = false
+
+    def initialize
+      @queue = Queue.default
+      @queue << self
+
+      spawn do
+        loop do
+          sleep 1.second
+          next if @stopped || @downloading
+          begin
+            job = pop
+            next if job.nil?
+            download job
+          rescue e
+            Logger.error e
+            @downloading = false
+          end
+        end
+      end
+    end
+
+    abstract def pop : Job?
+    private abstract def download(job : Job)
+  end
+
+  enum JobStatus
+    Pending      # 0
+    Downloading  # 1
+    Error        # 2
+    Completed    # 3
+    MissingPages # 4
+  end
+
+  struct Job
+    property id : String
+    property manga_id : String
+    property title : String
+    property manga_title : String
+    property status : JobStatus
+    property status_message : String = ""
+    property pages : Int32 = 0
+    property success_count : Int32 = 0
+    property fail_count : Int32 = 0
+    property time : Time
+    property plugin_id : String?
+    property plugin_chapter_id : String?
+
+    def parse_query_result(res : DB::ResultSet)
+      @id = res.read String
+      @manga_id = res.read String
+      @title = res.read String
+      @manga_title = res.read String
+      status = res.read Int32
+      @status_message = res.read String
+      @pages = res.read Int32
+      @success_count = res.read Int32
+      @fail_count = res.read Int32
+      time = res.read Int64
+      @status = JobStatus.new status
+      @time = Time.unix_ms time
+
+      ary = @id.split("-")
+      if ary.size == 2
+        @plugin_id = ary[0]
+        # This begin-rescue block is for backward compatibility. In earlier
+        #   versions we didn't encode the chapter ID
+        @plugin_chapter_id = begin
+          Base64.decode_string ary[1]
+        rescue
+          ary[1]
+        end
+      end
+    end
+
+    # Raises if the result set does not contain the correct set of columns
+    def self.from_query_result(res : DB::ResultSet)
+      job = Job.allocate
+      job.parse_query_result res
+      job
+    end
+
+    def initialize(@id, @manga_id, @title, @manga_title, @status, @time,
+                   @plugin_id = nil)
+    end
+
+    def to_json(json)
+      json.object do
+        {% for name in ["id", "manga_id", "title", "manga_title",
+                        "status_message"] %}
+          json.field {{name}}, @{{name.id}}
+        {% end %}
+        {% for name in ["pages", "success_count", "fail_count"] %}
+          json.field {{name}} do
+            json.number @{{name.id}}
+          end
+        {% end %}
+        json.field "status", @status.to_s
+        json.field "time" do
+          json.number @time.to_unix_ms
+        end
+        json.field "plugin_id", @plugin_id if @plugin_id
+      end
+    end
+  end
+
+  getter path : String
+  @downloaders = [] of Downloader
+  @paused = false
+
+  use_default
+
+  def initialize(db_path : String? = nil)
+    @path = db_path || Config.current.queue_db_path.to_s
+    dir = File.dirname @path
+    unless Dir.exists? dir
+      Logger.info "The queue DB directory #{dir} does not exist. " \
+                  "Attepmting to create it"
+      Dir.mkdir_p dir
+    end
+    MainFiber.run do
+      DB.open "sqlite3://#{@path}" do |db|
+        begin
+          db.exec "create table if not exists queue " \
+                  "(id text, manga_id text, title text, manga_title " \
+                  "text, status integer, status_message text, " \
+                  "pages integer, success_count integer, " \
+                  "fail_count integer, time integer)"
+          db.exec "create unique index if not exists id_idx " \
+                  "on queue (id)"
+          db.exec "create index if not exists manga_id_idx " \
+                  "on queue (manga_id)"
+          db.exec "create index if not exists status_idx " \
+                  "on queue (status)"
+        rescue e
+          Logger.error "Error when checking tables in DB: #{e}"
+          raise e
+        end
+      end
+    end
+  end
+
+  # Push an array of jobs into the queue, and return the number of jobs
+  #   inserted. Any job already exists in the queue will be ignored.
+  def push(jobs : Array(Job))
+    start_count = self.count
+    MainFiber.run do
+      DB.open "sqlite3://#{@path}" do |db|
+        jobs.each do |job|
+          db.exec "insert or ignore into queue values " \
+                  "(?, ?, ?, ?, ?, ?, ?, ?, ?, ?)",
+            job.id, job.manga_id, job.title, job.manga_title,
+            job.status.to_i, job.status_message, job.pages,
+            job.success_count, job.fail_count, job.time.to_unix_ms
+        end
+      end
+    end
+    self.count - start_count
+  end
+
+  def reset(id : String)
+    MainFiber.run do
+      DB.open "sqlite3://#{@path}" do |db|
+        db.exec "update queue set status = 0, status_message = '', " \
+                "pages = 0, success_count = 0, fail_count = 0 " \
+                "where id = (?)", id
+      end
+    end
+  end
+
+  def reset(job : Job)
+    self.reset job.id
+  end
+
+  # Reset all failed tasks (missing pages and error)
+  def reset
+    MainFiber.run do
+      DB.open "sqlite3://#{@path}" do |db|
+        db.exec "update queue set status = 0, status_message = '', " \
+                "pages = 0, success_count = 0, fail_count = 0 " \
+                "where status = 2 or status = 4"
+      end
+    end
+  end
+
+  def delete(id : String)
+    MainFiber.run do
+      DB.open "sqlite3://#{@path}" do |db|
+        db.exec "delete from queue where id = (?)", id
+      end
+    end
+  end
+
+  def delete(job : Job)
+    self.delete job.id
+  end
+
+  def exists?(id : String)
+    res = false
+    MainFiber.run do
+      DB.open "sqlite3://#{@path}" do |db|
+        res = db.query_one "select count(*) from queue where id = (?)", id,
+          as: Bool
+      end
+    end
+    res
+  end
+
+  def exists?(job : Job)
+    self.exists? job.id
+  end
+
+  def delete_status(status : JobStatus)
+    MainFiber.run do
+      DB.open "sqlite3://#{@path}" do |db|
+        db.exec "delete from queue where status = (?)", status.to_i
+      end
+    end
+  end
+
+  def count_status(status : JobStatus)
+    num = 0
+    MainFiber.run do
+      DB.open "sqlite3://#{@path}" do |db|
+        num = db.query_one "select count(*) from queue where " \
+                           "status = (?)", status.to_i, as: Int32
+      end
+    end
+    num
+  end
+
+  def count
+    num = 0
+    MainFiber.run do
+      DB.open "sqlite3://#{@path}" do |db|
+        num = db.query_one "select count(*) from queue", as: Int32
+      end
+    end
+    num
+  end
+
+  def set_status(status : JobStatus, job : Job)
+    MainFiber.run do
+      DB.open "sqlite3://#{@path}" do |db|
+        db.exec "update queue set status = (?) where id = (?)",
+          status.to_i, job.id
+      end
+    end
+  end
+
+  def get_all
+    jobs = [] of Job
+    MainFiber.run do
+      DB.open "sqlite3://#{@path}" do |db|
+        jobs = db.query_all "select * from queue order by time" do |rs|
+          Job.from_query_result rs
+        end
+      end
+    end
+    jobs
+  end
+
+  def add_success(job : Job)
+    MainFiber.run do
+      DB.open "sqlite3://#{@path}" do |db|
+        db.exec "update queue set success_count = success_count + 1 " \
+                "where id = (?)", job.id
+      end
+    end
+  end
+
+  def add_fail(job : Job)
+    MainFiber.run do
+      DB.open "sqlite3://#{@path}" do |db|
+        db.exec "update queue set fail_count = fail_count + 1 " \
+                "where id = (?)", job.id
+      end
+    end
+  end
+
+  def set_pages(pages : Int32, job : Job)
+    MainFiber.run do
+      DB.open "sqlite3://#{@path}" do |db|
+        db.exec "update queue set pages = (?), success_count = 0, " \
+                "fail_count = 0 where id = (?)", pages, job.id
+      end
+    end
+  end
+
+  def add_message(msg : String, job : Job)
+    MainFiber.run do
+      DB.open "sqlite3://#{@path}" do |db|
+        db.exec "update queue set status_message = " \
+                "status_message || (?) || (?) where id = (?)",
+          "\n", msg, job.id
+      end
+    end
+  end
+
+  def <<(downloader : Downloader)
+    @downloaders << downloader
+  end
+
+  def pause
+    @downloaders.each &.stopped=(true)
+    @paused = true
+  end
+
+  def resume
+    @downloaders.each &.stopped=(false)
+    @paused = false
+  end
+
+  def paused?
+    @paused
+  end
+end

src/rename.cr

@@ -0,0 +1,151 @@
+module Rename
+  alias VHash = Hash(String, String)
+
+  abstract class Base(T)
+    @ary = [] of T
+
+    def push(var)
+      @ary.push var
+    end
+
+    abstract def render(hash : VHash)
+  end
+
+  class Variable < Base(String)
+    property id : String
+
+    def initialize(@id)
+    end
+
+    def render(hash : VHash)
+      hash[@id]? || ""
+    end
+  end
+
+  class Pattern < Base(Variable)
+    def render(hash : VHash)
+      @ary.each do |v|
+        if hash.has_key? v.id
+          return v.render hash
+        end
+      end
+      ""
+    end
+  end
+
+  class Group < Base(Pattern | String)
+    def render(hash : VHash)
+      return "" if @ary.select(Pattern)
+                     .any? &.as(Pattern).render(hash).empty?
+      @ary.join do |e|
+        if e.is_a? Pattern
+          e.render hash
+        else
+          e
+        end
+      end
+    end
+  end
+
+  class Rule < Base(Group | String | Pattern)
+    ESCAPE = ['/']
+
+    def initialize(str : String)
+      parse! str
+    rescue e
+      raise "Failed to parse rename rule #{str}. Error: #{e}"
+    end
+
+    private def parse!(str : String)
+      chars = [] of Char
+      pattern : Pattern? = nil
+      group : Group? = nil
+
+      str.each_char_with_index do |char, i|
+        if ['[', ']', '{', '}', '|'].includes?(char) && !chars.empty?
+          string = chars.join
+          if !pattern.nil?
+            pattern.push Variable.new string.strip
+          elsif !group.nil?
+            group.push string
+          else
+            @ary.push string
+          end
+          chars = [] of Char
+        end
+
+        case char
+        when '['
+          if !group.nil? || !pattern.nil?
+            raise "nested groups are not allowed"
+          end
+          group = Group.new
+        when ']'
+          if group.nil?
+            raise "unmatched ] at position #{i}"
+          end
+          if !pattern.nil?
+            raise "patterns (`{}`) should be closed before closing the " \
+                  "group (`[]`)"
+          end
+          @ary.push group
+          group = nil
+        when '{'
+          if !pattern.nil?
+            raise "nested patterns are not allowed"
+          end
+          pattern = Pattern.new
+        when '}'
+          if pattern.nil?
+            raise "unmatched } at position #{i}"
+          end
+          if !group.nil?
+            group.push pattern
+          else
+            @ary.push pattern
+          end
+          pattern = nil
+        when '|'
+          if pattern.nil?
+            chars.push char
+          end
+        else
+          if ESCAPE.includes? char
+            raise "the character #{char} at position #{i} is not allowed"
+          end
+          chars.push char
+        end
+      end
+
+      unless chars.empty?
+        @ary.push chars.join
+      end
+      if !pattern.nil?
+        raise "unclosed pattern {"
+      end
+      if !group.nil?
+        raise "unclosed group ["
+      end
+    end
+
+    def render(hash : VHash)
+      str = @ary.join do |e|
+        if e.is_a? String
+          e
+        else
+          e.render hash
+        end
+      end.strip
+      post_process str
+    end
+
+    # Post-processes the generated file/folder name
+    #   - Handles the rare case where the string is `..`
+    #   - Removes trailing spaces and periods
+    #   - Replace illegal characters with `_`
+    private def post_process(str)
+      return "_" if str == ".."
+      str.rstrip(" .").gsub /[\/?<>\\:*|"^]/, "_"
+    end
+  end
+end

src/routes/admin.cr

@@ -1,103 +1,82 @@
-require "./router"
+require "sanitize"
 
-class AdminRouter < Router
-	def setup
-		get "/admin" do |env|
-			layout "admin"
-		end
+struct AdminRouter
+  def initialize
+    get "/admin" do |env|
+      storage = Storage.default
+      missing_count = storage.missing_titles.size +
+                      storage.missing_entries.size
+      layout "admin"
+    end
 
-		get "/admin/user" do |env|
-			users = @context.storage.list_users
-			username = get_username env
-			layout "user"
-		end
+    get "/admin/user" do |env|
+      users = Storage.default.list_users
+      username = get_username env
+      layout "user"
+    end
 
-		get "/admin/user/edit" do |env|
-			username = env.params.query["username"]?
-			admin = env.params.query["admin"]?
-			if admin
-				admin = admin == "true"
-			end
-			error = env.params.query["error"]?
-				current_user = get_username env
-			new_user = username.nil? && admin.nil?
-			layout "user-edit"
-		end
+    get "/admin/user/edit" do |env|
+      sanitizer = Sanitize::Policy::Text.new
+      username = env.params.query["username"]?.try { |s| sanitizer.process s }
+      admin = env.params.query["admin"]?
+      if admin
+        admin = admin == "true"
+      end
+      error = env.params.query["error"]?.try { |s| sanitizer.process s }
+      new_user = username.nil? && admin.nil?
+      layout "user-edit"
+    end
 
-		post "/admin/user/edit" do |env|
-			# creating new user
-			begin
-				username = env.params.body["username"]
-				password = env.params.body["password"]
-				# if `admin` is unchecked, the body hash
-				# 	would not contain `admin`
-				admin = !env.params.body["admin"]?.nil?
+    post "/admin/user/edit" do |env|
+      # creating new user
+      username = env.params.body["username"]
+      password = env.params.body["password"]
+      # if `admin` is unchecked, the body hash
+      #   would not contain `admin`
+      admin = !env.params.body["admin"]?.nil?
 
-				if username.size < 3
-					raise "Username should contain at least 3 characters"
-				end
-				if (username =~ /^[A-Za-z0-9_]+$/).nil?
-					raise "Username should contain alphanumeric characters "\
-						"and underscores only"
-				end
-				if password.size < 6
-					raise "Password should contain at least 6 characters"
-				end
-				if (password =~ /^[[:ascii:]]+$/).nil?
-					raise "password should contain ASCII characters only"
-				end
+      Storage.default.new_user username, password, admin
 
-				@context.storage.new_user username, password, admin
+      redirect env, "/admin/user"
+    rescue e
+      Logger.error e
+      redirect_url = URI.new \
+        path: "/admin/user/edit",
+        query: hash_to_query({"error" => e.message})
+      redirect env, redirect_url.to_s
+    end
 
-				env.redirect "/admin/user"
-			rescue e
-				@context.error e
-				redirect_url = URI.new \
-					path: "/admin/user/edit",\
-					query: hash_to_query({"error" => e.message})
-				env.redirect redirect_url.to_s
-			end
-		end
+    post "/admin/user/edit/:original_username" do |env|
+      # editing existing user
+      username = env.params.body["username"]
+      password = env.params.body["password"]
+      # if `admin` is unchecked, the body hash would not contain `admin`
+      admin = !env.params.body["admin"]?.nil?
+      original_username = env.params.url["original_username"]
 
-		post "/admin/user/edit/:original_username" do |env|
-			# editing existing user
-			begin
-				username = env.params.body["username"]
-				password = env.params.body["password"]
-				# if `admin` is unchecked, the body
-				#	hash would not contain `admin`
-				admin = !env.params.body["admin"]?.nil?
-				original_username = env.params.url["original_username"]
+      Storage.default.update_user \
+        original_username, username, password, admin
 
-				if username.size < 3
-					raise "Username should contain at least 3 characters"
-				end
-				if (username =~ /^[A-Za-z0-9_]+$/).nil?
-					raise "Username should contain alphanumeric characters "\
-						"and underscores only"
-				end
+      redirect env, "/admin/user"
+    rescue e
+      Logger.error e
+      redirect_url = URI.new \
+        path: "/admin/user/edit",
+        query: hash_to_query({"username" => original_username, \
+                                 "admin" => admin, "error" => e.message})
+      redirect env, redirect_url.to_s
+    end
 
-				if password.size != 0
-					if password.size < 6
-						raise "Password should contain at least 6 characters"
-					end
-					if (password =~ /^[[:ascii:]]+$/).nil?
-						raise "password should contain ASCII characters only"
-					end
-				end
+    get "/admin/downloads" do |env|
+      layout "download-manager"
+    end
 
-				@context.storage.update_user \
-					original_username, username, password, admin
+    get "/admin/subscriptions" do |env|
+      layout "subscription-manager"
+    end
 
-				env.redirect "/admin/user"
-			rescue e
-				@context.error e
-				redirect_url = URI.new \
-					path: "/admin/user/edit",\
-					query: hash_to_query({"username" => original_username, \
-						   "admin" => admin, "error" => e.message})
-					env.redirect redirect_url.to_s
-			end
-		end
-	end
+    get "/admin/missing" do |env|
+      layout "missing-items"
+    end
+  end
 end

src/routes/main.cr

@@ -1,56 +1,153 @@
-require "./router"
+struct MainRouter
+  def initialize
+    get "/login" do |env|
+      base_url = Config.current.base_url
+      render "src/views/login.html.ecr"
+    end
 
-class MainRouter < Router
-	def setup
-		get "/login" do |env|
-			render "src/views/login.ecr"
-		end
+    get "/logout" do |env|
+      begin
+        env.session.delete_string "token"
+      rescue e
+        Logger.error "Error when attempting to log out: #{e}"
+      ensure
+        redirect env, "/login"
+      end
+    end
 
-		get "/logout" do |env|
-			begin
-				cookie = env.request.cookies
-					.find { |c| c.name == "token" }.not_nil!
-				@context.storage.logout cookie.value
-			rescue e
-				@context.error "Error when attempting to log out: #{e}"
-			ensure
-				env.redirect "/login"
-			end
-		end
+    post "/login" do |env|
+      begin
+        username = env.params.body["username"]
+        password = env.params.body["password"]
+        token = Storage.default.verify_user(username, password).not_nil!
 
-		post "/login" do |env|
-			begin
-				username = env.params.body["username"]
-				password = env.params.body["password"]
-				token = @context.storage.verify_user(username, password)
-					.not_nil!
+        env.session.string "token", token
 
-				cookie = HTTP::Cookie.new "token", token
-				env.response.cookies << cookie
-				env.redirect "/"
-			rescue
-				env.redirect "/login"
-			end
-		end
-		get "/" do |env|
-			titles = @context.library.titles
-			username = get_username env
-			percentage = titles.map &.load_percetage username
-			layout "index"
-		end
+        callback = env.session.string? "callback"
+        if callback
+          env.session.delete_string "callback"
+          redirect env, callback
+        else
+          redirect env, "/"
+        end
+      rescue e
+        Logger.error e
+        redirect env, "/login"
+      end
+    end
 
-		get "/book/:title" do |env|
-			begin
-				title = (@context.library.get_title env.params.url["title"])
-					.not_nil!
-				username = get_username env
-				percentage = title.entries.map { |e|
-					title.load_percetage username, e.title }
-				layout "title"
-			rescue e
-				@context.error e
-				env.response.status_code = 404
-			end
-		end
-	end
+    get "/library" do |env|
+      begin
+        username = get_username env
+
+        sort_opt = SortOptions.from_info_json Library.default.dir, username
+        get_and_save_sort_opt Library.default.dir
+
+        titles = Library.default.sorted_titles username, sort_opt
+        percentage = titles.map &.load_percentage username
+
+        layout "library"
+      rescue e
+        Logger.error e
+        env.response.status_code = 500
+      end
+    end
+
+    get "/book/:title" do |env|
+      begin
+        title = (Library.default.get_title env.params.url["title"]).not_nil!
+        username = get_username env
+
+        sort_opt = SortOptions.from_info_json title.dir, username
+        get_and_save_sort_opt title.dir
+
+        sorted_titles = title.sorted_titles username, sort_opt
+        entries = title.sorted_entries username, sort_opt
+        percentage = title.load_percentage_for_all_entries username, sort_opt
+        title_percentage = title.titles.map &.load_percentage username
+        title_percentage_map = {} of String => Float64
+        title_percentage.each_with_index do |tp, i|
+          t = title.titles[i]
+          title_percentage_map[t.id] = tp
+        end
+
+        layout "title"
+      rescue e
+        Logger.error e
+        env.response.status_code = 500
+      end
+    end
+
+    get "/download/plugins" do |env|
+      begin
+        layout "plugin-download"
+      rescue e
+        Logger.error e
+        env.response.status_code = 500
+      end
+    end
+
+    get "/" do |env|
+      begin
+        username = get_username env
+        continue_reading = Library.default
+          .get_continue_reading_entries username
+        recently_added = Library.default.get_recently_added_entries username
+        start_reading = Library.default.get_start_reading_titles username
+        titles = Library.default.titles
+        new_user = !titles.any? &.load_percentage(username).> 0
+        empty_library = titles.size == 0
+        layout "home"
+      rescue e
+        Logger.error e
+        env.response.status_code = 500
+      end
+    end
+
+    get "/tags/:tag" do |env|
+      begin
+        username = get_username env
+        tag = env.params.url["tag"]
+
+        sort_opt = SortOptions.new
+        get_sort_opt
+
+        title_ids = Storage.default.get_tag_titles tag
+
+        raise "Tag #{tag} not found" if title_ids.empty?
+
+        titles = title_ids.map { |id| Library.default.get_title id }
+          .select Title
+
+        titles = sort_titles titles, sort_opt, username
+        percentage = titles.map &.load_percentage username
+
+        layout "tag"
+      rescue e
+        Logger.error e
+        env.response.status_code = 404
+      end
+    end
+
+    get "/tags" do |env|
+      tags = Storage.default.list_tags.map do |tag|
+        {
+          tag:         tag,
+          encoded_tag: URI.encode_www_form(tag, space_to_plus: false),
+          count:       Storage.default.get_tag_titles(tag).size,
+        }
+      end
+      # Sort by :count reversly, and then sort by :tag
+      tags.sort! do |a, b|
+        (b[:count] <=> a[:count]).or(a[:tag] <=> b[:tag])
+      end
+
+      layout "tags"
+    end
+
+    get "/api" do |env|
+      base_url = Config.current.base_url
+      render "src/views/api.html.ecr"
+    end
+  end
 end

src/routes/opds.cr

@@ -0,0 +1,18 @@
+struct OPDSRouter
+  def initialize
+    get "/opds" do |env|
+      titles = Library.default.titles
+      render_xml "src/views/opds/index.xml.ecr"
+    end
+
+    get "/opds/book/:title_id" do |env|
+      begin
+        title = Library.default.get_title(env.params.url["title_id"]).not_nil!
+        render_xml "src/views/opds/title.xml.ecr"
+      rescue e
+        Logger.error e
+        env.response.status_code = 404
+      end
+    end
+  end
+end

src/routes/reader.cr

@@ -1,58 +1,60 @@
-require "./router"
+struct ReaderRouter
+  def initialize
+    get "/reader/:title/:entry" do |env|
+      begin
+        username = get_username env
 
-class ReaderRouter < Router
-	def setup
-		get "/reader/:title/:entry" do |env|
-			begin
-				title = (@context.library.get_title env.params.url["title"])
-					.not_nil!
-				entry = (title.get_entry env.params.url["entry"]).not_nil!
+        title = (Library.default.get_title env.params.url["title"]).not_nil!
+        entry = (title.get_entry env.params.url["entry"]).not_nil!
 
-				# load progress
-				username = get_username env
-				page = title.load_progress username, entry.title
-				# we go back 2 * `IMGS_PER_PAGE` pages. the infinite scroll
-				# 	library perloads a few pages in advance, and the user
-				# 	might not have actually read them
-				page = [page - 2 * IMGS_PER_PAGE, 1].max
+        next layout "reader-error" if entry.err_msg
 
-				env.redirect "/reader/#{title.id}/#{entry.id}/#{page}"
-			rescue e
-				@context.error e
-				env.response.status_code = 404
-			end
-		end
+        # load progress
+        page_idx = [1, entry.load_progress username].max
 
-		get "/reader/:title/:entry/:page" do |env|
-			begin
-				title = (@context.library.get_title env.params.url["title"])
-					.not_nil!
-				entry = (title.get_entry env.params.url["entry"]).not_nil!
-				page = env.params.url["page"].to_i
-				raise "" if page > entry.pages || page <= 0
+        # start from page 1 if the user has finished reading the entry
+        page_idx = 1 if entry.finished? username
 
-				# save progress
-				username = get_username env
-				title.save_progress username, entry.title, page
+        redirect env, "/reader/#{title.id}/#{entry.id}/#{page_idx}"
+      rescue e
+        Logger.error e
+        env.response.status_code = 404
+      end
+    end
 
-				pages = (page...[entry.pages + 1, page + IMGS_PER_PAGE].min)
-				urls = pages.map { |idx|
-					"/api/page/#{title.id}/#{entry.id}/#{idx}" }
-				reader_urls = pages.map { |idx|
-					"/reader/#{title.id}/#{entry.id}/#{idx}" }
-				next_page = page + IMGS_PER_PAGE
-				next_url = next_page > entry.pages ? nil :
-					"/reader/#{title.id}/#{entry.id}/#{next_page}"
-				exit_url = "/book/#{title.id}"
-				next_entry = title.next_entry entry
-				next_entry_url = next_entry.nil? ? nil : \
-					"/reader/#{title.id}/#{next_entry.id}"
+    get "/reader/:title/:entry/:page" do |env|
+      begin
+        base_url = Config.current.base_url
 
-				render "src/views/reader.ecr"
-			rescue e
-				@context.error e
-				env.response.status_code = 404
-			end
-		end
-	end
+        username = get_username env
+
+        title = (Library.default.get_title env.params.url["title"]).not_nil!
+        entry = (title.get_entry env.params.url["entry"]).not_nil!
+
+        sort_opt = SortOptions.from_info_json title.dir, username
+        get_sort_opt
+        entries = title.sorted_entries username, sort_opt
+
+        page_idx = env.params.url["page"].to_i
+        if page_idx > entry.pages || page_idx <= 0
+          raise "Page #{page_idx} not found."
+        end
+
+        exit_url = "#{base_url}book/#{title.id}"
+
+        next_entry_url = entry.next_entry(username).try do |e|
+          "#{base_url}reader/#{title.id}/#{e.id}"
+        end
+
+        previous_entry_url = entry.previous_entry(username).try do |e|
+          "#{base_url}reader/#{title.id}/#{e.id}"
+        end
+
+        render "src/views/reader.html.ecr"
+      rescue e
+        Logger.error e
+        env.response.status_code = 404
+      end
+    end
+  end
 end

src/routes/router.cr

@@ -1,6 +0,0 @@
-require "../context"
-
-class Router
-	def initialize(@context : Context)
-	end
-end

src/server.cr

@@ -1,41 +1,66 @@
 require "kemal"
-require "./context"
-require "./auth_handler"
-require "./static_handler"
-require "./log_handler"
-require "./util"
+require "kemal-session"
+require "./library/*"
+require "./handlers/*"
+require "./util/*"
 require "./routes/*"
 
 class Server
-	def initialize(@context : Context)
+  def initialize
+    error 404 do |env|
+      message = "HTTP 404: Mango cannot find the page #{env.request.path}"
+      layout "message"
+    end
 
-		error 403 do |env|
-			message = "You are not authorized to visit #{env.request.path}"
-			layout "message"
-		end
+    {% if flag?(:release) %}
+      error 500 do |env|
+        message = "HTTP 500: Internal server error. Please try again later."
+        layout "message"
+      end
+    {% end %}
 
-		MainRouter.new(@context).setup
-		AdminRouter.new(@context).setup
-		ReaderRouter.new(@context).setup
-		APIRouter.new(@context).setup
+    MainRouter.new
+    AdminRouter.new
+    ReaderRouter.new
+    APIRouter.new
 
-		Kemal.config.logging = false
-		add_handler LogHandler.new @context.logger
-		add_handler AuthHandler.new @context.storage
-		{% if flag?(:release) %}
-			# when building for relase, embed the static files in binary
-			@context.debug "We are in release mode. Using embeded static files."
-			serve_static false
-			add_handler StaticHandler.new
-		{% end %}
-	end
+    {% for path in %w(/api/* /uploads/* /img/*) %}
+      options {{path}} do |env|
+        cors
+        halt env
+      end
+    {% end %}
 
-	def start
-		@context.debug "Starting Kemal server"
-		{% if flag?(:release) %}
-			Kemal.config.env = "production"
-		{% end %}
-		Kemal.config.port = @context.config.port
-		Kemal.run
-	end
+    static_headers do |response|
+      response.headers.add("Access-Control-Allow-Origin", "*")
+    end
+
+    Kemal.config.logging = false
+    add_handler LogHandler.new
+    add_handler AuthHandler.new
+    add_handler UploadHandler.new Config.current.upload_path
+    {% if flag?(:release) %}
+      # when building for relase, embed the static files in binary
+      Logger.debug "We are in release mode. Using embedded static files."
+      serve_static false
+      add_handler StaticHandler.new
+    {% end %}
+
+    Kemal::Session.config do |c|
+      c.timeout = 365.days
+      c.secret = Config.current.session_secret
+      c.cookie_name = "mango-sessid-#{Config.current.port}"
+      c.path = Config.current.base_url
+    end
+  end
+
+  def start
+    Logger.debug "Starting Kemal server"
+    {% if flag?(:release) %}
+      Kemal.config.env = "production"
+    {% end %}
+    Kemal.config.host_binding = Config.current.host
+    Kemal.config.port = Config.current.port
+    Kemal.run
+  end
 end

src/static_handler.cr

@@ -1,31 +0,0 @@
-require "baked_file_system"
-require "kemal"
-require "gzip"
-require "./util"
-
-class FS
-	extend BakedFileSystem
-	{% if read_file? "#{__DIR__}/../dist/favicon.ico" %}
-		{% puts "baking ../dist" %}
-		bake_folder "../dist"
-	{% else %}
-		{% puts "baking ../public" %}
-		bake_folder "../public"
-	{% end %}
-end
-
-class StaticHandler < Kemal::Handler
-	@dirs = ["/css", "/js", "/img", "/favicon.ico"]
-
-	def call(env)
-		if request_path_startswith env, @dirs
-			file = FS.get? env.request.path
-			return call_next env if file.nil?
-
-			slice = Bytes.new file.size
-			file.read slice
-			return send_file env, slice, file.mime_type
-		end
-		call_next env
-	end
-end

src/storage.cr

@@ -2,176 +2,646 @@ require "sqlite3"
 require "crypto/bcrypt"
 require "uuid"
 require "base64"
+require "./util/*"
+require "mg"
+require "../migration/*"
 
 def hash_password(pw)
-	Crypto::Bcrypt::Password.create(pw).to_s
+  Crypto::Bcrypt::Password.create(pw).to_s
 end
 
 def verify_password(hash, pw)
-	(Crypto::Bcrypt::Password.new hash).verify pw
-end
-
-def random_str
-	UUID.random.to_s.gsub "-", ""
+  (Crypto::Bcrypt::Password.new hash).verify pw
 end
 
 class Storage
-	def initialize(@path : String, @logger : MLogger)
-		dir = File.dirname path
-		unless Dir.exists? dir
-			@logger.info "The DB directory #{dir} does not exist. " \
-				"Attepmting to create it"
-			Dir.mkdir_p dir
-		end
-		DB.open "sqlite3://#{path}" do |db|
-			begin
-				# We create the `ids` table first. even if the uses has an
-				#	early version installed and has the `user` table only,
-				#	we will still be able to create `ids`
-				db.exec "create table ids" \
-					"(path text, id text, is_title integer)"
-				db.exec "create unique index path_idx on ids (path)"
-				db.exec "create unique index id_idx on ids (id)"
+  @@insert_entry_ids = [] of IDTuple
+  @@insert_title_ids = [] of IDTuple
 
-				db.exec "create table users" \
-					"(username text, password text, token text, admin integer)"
-			rescue e
-				unless e.message.not_nil!.ends_with? "already exists"
-					@logger.fatal "Error when checking tables in DB: #{e}"
-					raise e
-				end
-			else
-				@logger.debug "Creating DB file at #{@path}"
-				db.exec "create unique index username_idx on users (username)"
-				db.exec "create unique index token_idx on users (token)"
-				random_pw = random_str
-				hash = hash_password random_pw
-				db.exec "insert into users values (?, ?, ?, ?)",
-					"admin", hash, nil, 1
-				puts "Initial user created. You can log in with " \
-					"#{{"username" => "admin", "password" => random_pw}}"
-			end
-		end
-	end
+  @path : String
+  @db : DB::Database?
 
-	def verify_user(username, password)
-		DB.open "sqlite3://#{@path}" do |db|
-			begin
-				hash, token = db.query_one "select password, token from "\
-					"users where username = (?)", \
-					username, as: {String, String?}
-				unless verify_password hash, password
-					@logger.debug "Password does not match the hash"
-					return nil
-				end
-				@logger.debug "User #{username} verified"
-				return token if token
-				token = random_str
-				@logger.debug "Updating token for #{username}"
-				db.exec "update users set token = (?) where username = (?)",
-					token, username
-				return token
-			rescue e
-				@logger.error "Error when verifying user #{username}: #{e}"
-				return nil
-			end
-		end
-	end
+  alias IDTuple = NamedTuple(
+    path: String,
+    id: String,
+    signature: String?)
 
-	def verify_token(token)
-		DB.open "sqlite3://#{@path}" do |db|
-			begin
-				username = db.query_one "select username from users where " \
-					"token = (?)", token, as: String
-				return username
-			rescue e
-				@logger.debug "Unable to verify token"
-				return nil
-			end
-		end
-	end
+  use_default
 
-	def verify_admin(token)
-		DB.open "sqlite3://#{@path}" do |db|
-			begin
-				return db.query_one "select admin from users where " \
-					"token = (?)", token, as: Bool
-			rescue e
-				@logger.debug "Unable to verify user as admin"
-				return false
-			end
-		end
-	end
+  def initialize(db_path : String? = nil, init_user = true, *,
+                 @auto_close = true)
+    @path = db_path || Config.current.db_path
+    dir = File.dirname @path
+    unless Dir.exists? dir
+      Logger.info "The DB directory #{dir} does not exist. " \
+                  "Attempting to create it"
+      Dir.mkdir_p dir
+    end
+    MainFiber.run do
+      DB.open "sqlite3://#{@path}" do |db|
+        begin
+          MG::Migration.new(db, log: Logger.default.raw_log).migrate
+        rescue e
+          Logger.fatal "DB migration failed. #{e}"
+          raise e
+        end
 
-	def list_users
-		results = Array(Tuple(String, Bool)).new
-		DB.open "sqlite3://#{@path}" do |db|
-			db.query "select username, admin from users" do |rs|
-				rs.each do
-					results << {rs.read(String), rs.read(Bool)}
-				end
-			end
-		end
-		results
-	end
+        user_count = db.query_one "select count(*) from users", as: Int32
+        init_admin if init_user && user_count == 0
+      end
+      unless @auto_close
+        @db = DB.open "sqlite3://#{@path}"
+      end
+    end
+  end
 
-	def new_user(username, password, admin)
-		admin = (admin ? 1 : 0)
-		DB.open "sqlite3://#{@path}" do |db|
-			hash = hash_password password
-			db.exec "insert into users values (?, ?, ?, ?)",
-				username, hash, nil, admin
-		end
-	end
+  macro init_admin
+    random_pw = random_str
+    hash = hash_password random_pw
+    db.exec "insert into users values (?, ?, ?, ?)",
+      "admin", hash, nil, 1
+    Logger.log "Initial user created. You can log in with " \
+               "#{{"username" => "admin", "password" => random_pw}}"
+  end
 
-	def update_user(original_username, username, password, admin)
-		admin = (admin ? 1 : 0)
-		DB.open "sqlite3://#{@path}" do |db|
-			if password.size == 0
-				db.exec "update users set username = (?), admin = (?) "\
-					"where username = (?)",\
-					username, admin, original_username
-			else
-				hash = hash_password password
-				db.exec "update users set username = (?), admin = (?),"\
-					"password = (?) where username = (?)",\
-					username, admin, hash, original_username
-			end
-		end
-	end
+  private def get_db(&block : DB::Database ->)
+    if @db.nil?
+      DB.open "sqlite3://#{@path}" do |db|
+        db.exec "PRAGMA foreign_keys = 1"
+        yield db
+      end
+    else
+      @db.not_nil!.exec "PRAGMA foreign_keys = 1"
+      yield @db.not_nil!
+    end
+  end
 
-	def delete_user(username)
-		DB.open "sqlite3://#{@path}" do |db|
-			db.exec "delete from users where username = (?)", username
-		end
-	end
+  def username_exists(username)
+    exists = false
+    MainFiber.run do
+      get_db do |db|
+        exists = db.query_one("select count(*) from users where " \
+                              "username = (?)", username, as: Int32) > 0
+      end
+    end
+    exists
+  end
 
-	def logout(token)
-		DB.open "sqlite3://#{@path}" do |db|
-			begin
-				db.exec "update users set token = (?) where token = (?)", \
-					nil, token
-			rescue
-			end
-		end
-	end
+  def username_is_admin(username)
+    is_admin = false
+    MainFiber.run do
+      get_db do |db|
+        is_admin = db.query_one("select admin from users where " \
+                                "username = (?)", username, as: Int32) > 0
+      end
+    end
+    is_admin
+  end
 
-	def get_id(path, is_title)
-		DB.open "sqlite3://#{@path}" do |db|
-			begin
-				id = db.query_one "select id from ids where path = (?)",
-					path, as: {String}
-				return id
-			rescue
-				id = random_str
-				db.exec "insert into ids values (?, ?, ?)", path, id,
-					is_title ? 1 : 0
-				return id
-			end
-		end
-	end
+  def verify_user(username, password)
+    out_token = nil
+    MainFiber.run do
+      get_db do |db|
+        begin
+          hash, token = db.query_one "select password, token from " \
+                                     "users where username = (?)",
+            username, as: {String, String?}
+          unless verify_password hash, password
+            Logger.debug "Password does not match the hash"
+            next
+          end
+          Logger.debug "User #{username} verified"
+          if token
+            out_token = token
+            next
+          end
+          token = random_str
+          Logger.debug "Updating token for #{username}"
+          db.exec "update users set token = (?) where username = (?)",
+            token, username
+          out_token = token
+        rescue e
+          Logger.error "Error when verifying user #{username}: #{e}"
+        end
+      end
+    end
+    out_token
+  end
 
-	def to_json(json : JSON::Builder)
-		json.string self
-	end
+  def verify_token(token)
+    username = nil
+    MainFiber.run do
+      get_db do |db|
+        begin
+          username = db.query_one "select username from users where " \
+                                  "token = (?)", token, as: String
+        rescue e
+          Logger.debug "Unable to verify token"
+        end
+      end
+    end
+    username
+  end
+
+  def verify_admin(token)
+    is_admin = false
+    MainFiber.run do
+      get_db do |db|
+        begin
+          is_admin = db.query_one "select admin from users where " \
+                                  "token = (?)", token, as: Bool
+        rescue e
+          Logger.debug "Unable to verify user as admin"
+        end
+      end
+    end
+    is_admin
+  end
+
+  def list_users
+    results = Array(Tuple(String, Bool)).new
+    MainFiber.run do
+      get_db do |db|
+        db.query "select username, admin from users" do |rs|
+          rs.each do
+            results << {rs.read(String), rs.read(Bool)}
+          end
+        end
+      end
+    end
+    results
+  end
+
+  def new_user(username, password, admin)
+    validate_username username
+    validate_password password
+    admin = (admin ? 1 : 0)
+    MainFiber.run do
+      get_db do |db|
+        hash = hash_password password
+        db.exec "insert into users values (?, ?, ?, ?)",
+          username, hash, nil, admin
+      end
+    end
+  end
+
+  def update_user(original_username, username, password, admin)
+    admin = (admin ? 1 : 0)
+    validate_username username
+    validate_password password unless password.empty?
+    MainFiber.run do
+      get_db do |db|
+        if password.empty?
+          db.exec "update users set username = (?), admin = (?) " \
+                  "where username = (?)",
+            username, admin, original_username
+        else
+          hash = hash_password password
+          db.exec "update users set username = (?), admin = (?)," \
+                  "password = (?) where username = (?)",
+            username, admin, hash, original_username
+        end
+      end
+    end
+  end
+
+  def delete_user(username)
+    MainFiber.run do
+      get_db do |db|
+        db.exec "delete from users where username = (?)", username
+      end
+    end
+  end
+
+  def logout(token)
+    MainFiber.run do
+      get_db do |db|
+        begin
+          db.exec "update users set token = (?) where token = (?)", nil, token
+        rescue
+        end
+      end
+    end
+  end
+
+  def get_title_id(path, signature)
+    id = nil
+    path = Path.new(path).relative_to(Config.current.library_path).to_s
+    MainFiber.run do
+      get_db do |db|
+        # First attempt to find the matching title in DB using BOTH path
+        #   and signature
+        id = db.query_one? "select id from titles where path = (?) and " \
+                           "signature = (?) and unavailable = 0",
+          path, signature.to_s, as: String
+
+        should_update = id.nil?
+        # If it fails, try to match using the path only. This could happen
+        #   for example when a new entry is added to the title
+        id ||= db.query_one? "select id from titles where path = (?)", path,
+          as: String
+
+        # If it still fails, we will have to rely on the signature values.
+        #   This could happen when the user moved or renamed the title, or
+        #   a title containing the title
+        unless id
+          # If there are multiple rows with the same signature (this could
+          #   happen simply by bad luck, or when the user copied a title),
+          #   pick the row that has the most similar path to the give path
+          rows = [] of Tuple(String, String)
+          db.query "select id, path from titles where signature = (?)",
+            signature.to_s do |rs|
+            rs.each do
+              rows << {rs.read(String), rs.read(String)}
+            end
+          end
+          row = rows.max_by?(&.[1].components_similarity(path))
+          id = row[0] if row
+        end
+
+        # At this point, `id` would still be nil if there's no row matching
+        #   either the path or the signature
+
+        # If we did identify a matching title, save the path and signature
+        #   values back to the DB
+        if id && should_update
+          db.exec "update titles set path = (?), signature = (?), " \
+                  "unavailable = 0 where id = (?)", path, signature.to_s, id
+        end
+      end
+    end
+    id
+  end
+
+  # See the comments in `#get_title_id` to see how this method works.
+  def get_entry_id(path, signature)
+    id = nil
+    path = Path.new(path).relative_to(Config.current.library_path).to_s
+    MainFiber.run do
+      get_db do |db|
+        id = db.query_one? "select id from ids where path = (?) and " \
+                           "signature = (?) and unavailable = 0",
+          path, signature.to_s, as: String
+
+        should_update = id.nil?
+        id ||= db.query_one? "select id from ids where path = (?)", path,
+          as: String
+
+        unless id
+          rows = [] of Tuple(String, String)
+          db.query "select id, path from ids where signature = (?)",
+            signature.to_s do |rs|
+            rs.each do
+              rows << {rs.read(String), rs.read(String)}
+            end
+          end
+          row = rows.max_by?(&.[1].components_similarity(path))
+          id = row[0] if row
+        end
+
+        if id && should_update
+          db.exec "update ids set path = (?), signature = (?), " \
+                  "unavailable = 0 where id = (?)", path, signature.to_s, id
+        end
+      end
+    end
+    id
+  end
+
+  def insert_entry_id(tp)
+    @@insert_entry_ids << tp
+  end
+
+  def insert_title_id(tp)
+    @@insert_title_ids << tp
+  end
+
+  def bulk_insert_ids
+    MainFiber.run do
+      get_db do |db|
+        db.transaction do |tran|
+          conn = tran.connection
+          @@insert_title_ids.each do |tp|
+            path = Path.new(tp[:path])
+              .relative_to(Config.current.library_path).to_s
+            conn.exec "insert into titles (id, path, signature, " \
+                      "unavailable) values (?, ?, ?, 0)",
+              tp[:id], path, tp[:signature].to_s
+          end
+          @@insert_entry_ids.each do |tp|
+            path = Path.new(tp[:path])
+              .relative_to(Config.current.library_path).to_s
+            conn.exec "insert into ids (id, path, signature, " \
+                      "unavailable) values (?, ?, ?, 0)",
+              tp[:id], path, tp[:signature].to_s
+          end
+        end
+      end
+      @@insert_entry_ids.clear
+      @@insert_title_ids.clear
+    end
+  end
+
+  def get_title_sort_title(title_id : String)
+    sort_title = nil
+    MainFiber.run do
+      get_db do |db|
+        sort_title =
+          db.query_one? "Select sort_title from titles where id = (?)",
+            title_id, as: String | Nil
+      end
+    end
+    sort_title
+  end
+
+  def set_title_sort_title(title_id : String, sort_title : String | Nil)
+    sort_title = nil if sort_title == ""
+    MainFiber.run do
+      get_db do |db|
+        db.exec "update titles set sort_title = (?) where id = (?)",
+          sort_title, title_id
+      end
+    end
+  end
+
+  def get_entry_sort_title(entry_id : String)
+    sort_title = nil
+    MainFiber.run do
+      get_db do |db|
+        sort_title =
+          db.query_one? "Select sort_title from ids where id = (?)",
+            entry_id, as: String | Nil
+      end
+    end
+    sort_title
+  end
+
+  def get_entries_sort_title(ids : Array(String))
+    results = Hash(String, String | Nil).new
+    MainFiber.run do
+      get_db do |db|
+        db.query "select id, sort_title from ids where id in " \
+                 "(#{ids.join "," { |id| "'#{id}'" }})" do |rs|
+          rs.each do
+            id = rs.read String
+            sort_title = rs.read String | Nil
+            results[id] = sort_title
+          end
+        end
+      end
+    end
+    results
+  end
+
+  def set_entry_sort_title(entry_id : String, sort_title : String | Nil)
+    sort_title = nil if sort_title == ""
+    MainFiber.run do
+      get_db do |db|
+        db.exec "update ids set sort_title = (?) where id = (?)",
+          sort_title, entry_id
+      end
+    end
+  end
+
+  def save_thumbnail(id : String, img : Image)
+    MainFiber.run do
+      get_db do |db|
+        db.exec "insert into thumbnails values (?, ?, ?, ?, ?)", id, img.data,
+          img.filename, img.mime, img.size
+      end
+    end
+  end
+
+  def get_thumbnail(id : String) : Image?
+    img = nil
+    MainFiber.run do
+      get_db do |db|
+        db.query_one? "select * from thumbnails where id = (?)", id do |res|
+          img = Image.from_db res
+        end
+      end
+    end
+    img
+  end
+
+  def get_title_tags(id : String) : Array(String)
+    tags = [] of String
+    MainFiber.run do
+      get_db do |db|
+        db.query "select tag from tags where id = (?) order by tag", id do |rs|
+          rs.each do
+            tags << rs.read String
+          end
+        end
+      end
+    end
+    tags
+  end
+
+  def get_tag_titles(tag : String) : Array(String)
+    tids = [] of String
+    MainFiber.run do
+      get_db do |db|
+        db.query "select id from tags where tag = (?)", tag do |rs|
+          rs.each do
+            tids << rs.read String
+          end
+        end
+      end
+    end
+    tids
+  end
+
+  def list_tags : Array(String)
+    tags = [] of String
+    MainFiber.run do
+      get_db do |db|
+        db.query "select distinct tag from tags natural join titles " \
+                 "where unavailable = 0" do |rs|
+          rs.each do
+            tags << rs.read String
+          end
+        end
+      end
+    end
+    tags
+  end
+
+  def add_tag(id : String, tag : String)
+    err = nil
+    MainFiber.run do
+      begin
+        get_db do |db|
+          db.exec "insert into tags values (?, ?)", id, tag
+        end
+      rescue e
+        err = e
+      end
+    end
+    raise err.not_nil! if err
+  end
+
+  def delete_tag(id : String, tag : String)
+    MainFiber.run do
+      get_db do |db|
+        db.exec "delete from tags where id = (?) and tag = (?)", id, tag
+      end
+    end
+  end
+
+  # Mark titles and entries that no longer exist on the file system as
+  #   unavailable. By supplying `id_candidates` and `titles_candidates`, it
+  #   only checks the existence of the candidate titles/entries to speed up
+  #   the process.
+  def mark_unavailable(ids_candidates : Array(String)?,
+                       titles_candidates : Array(String)?)
+    MainFiber.run do
+      get_db do |db|
+        # Detect dangling entry IDs
+        trash_ids = [] of String
+        query = "select path, id from ids where unavailable = 0"
+        unless ids_candidates.nil?
+          query += " and id in (#{ids_candidates.join "," { |i| "'#{i}'" }})"
+        end
+        db.query query do |rs|
+          rs.each do
+            path = rs.read String
+            fullpath = Path.new(path).expand(Config.current.library_path).to_s
+            trash_ids << rs.read String unless File.exists? fullpath
+          end
+        end
+
+        unless trash_ids.empty?
+          Logger.debug "Marking #{trash_ids.size} entries as unavailable"
+        end
+        db.exec "update ids set unavailable = 1 where id in " \
+                "(#{trash_ids.join "," { |i| "'#{i}'" }})"
+
+        # Detect dangling title IDs
+        trash_titles = [] of String
+        query = "select path, id from titles where unavailable = 0"
+        unless titles_candidates.nil?
+          query += " and id in (#{titles_candidates.join "," { |i| "'#{i}'" }})"
+        end
+        db.query query do |rs|
+          rs.each do
+            path = rs.read String
+            fullpath = Path.new(path).expand(Config.current.library_path).to_s
+            trash_titles << rs.read String unless Dir.exists? fullpath
+          end
+        end
+
+        unless trash_titles.empty?
+          Logger.debug "Marking #{trash_titles.size} titles as unavailable"
+        end
+        db.exec "update titles set unavailable = 1 where id in " \
+                "(#{trash_titles.join "," { |i| "'#{i}'" }})"
+      end
+    end
+  end
+
+  private def get_missing(tablename)
+    ary = [] of IDTuple
+    MainFiber.run do
+      get_db do |db|
+        db.query "select id, path, signature from #{tablename} " \
+                 "where unavailable = 1" do |rs|
+          rs.each do
+            ary << {
+              id:        rs.read(String),
+              path:      rs.read(String),
+              signature: rs.read(String?),
+            }
+          end
+        end
+      end
+    end
+    ary
+  end
+
+  private def delete_missing(tablename, id : String? = nil)
+    MainFiber.run do
+      get_db do |db|
+        if id
+          db.exec "delete from #{tablename} where id = (?) " \
+                  "and unavailable = 1", id
+        else
+          db.exec "delete from #{tablename} where unavailable = 1"
+        end
+      end
+    end
+  end
+
+  def missing_entries
+    get_missing "ids"
+  end
+
+  def missing_titles
+    get_missing "titles"
+  end
+
+  def delete_missing_entry(id = nil)
+    delete_missing "ids", id
+  end
+
+  def delete_missing_title(id = nil)
+    delete_missing "titles", id
+  end
+
+  def save_md_token(username : String, token : String, expire : Time)
+    MainFiber.run do
+      get_db do |db|
+        count = db.query_one "select count(*) from md_account where " \
+                             "username = (?)", username, as: Int64
+        if count == 0
+          db.exec "insert into md_account values (?, ?, ?)", username, token,
+            expire.to_unix
+        else
+          db.exec "update md_account set token = (?), expire = (?) " \
+                  "where username = (?)", token, expire.to_unix, username
+        end
+      end
+    end
+  end
+
+  def get_md_token(username) : Tuple(String?, Time?)
+    token = nil
+    expires = nil
+    MainFiber.run do
+      get_db do |db|
+        db.query_one? "select token, expire from md_account where " \
+                      "username = (?)", username do |res|
+          token = res.read String
+          expires = Time.unix res.read Int64
+        end
+      end
+    end
+    {token, expires}
+  end
+
+  def count_titles : Int32
+    count = 0
+    MainFiber.run do
+      get_db do |db|
+        db.query "select count(*) from titles" do |rs|
+          rs.each do
+            count = rs.read Int32
+          end
+        end
+      end
+    end
+    count
+  end
+
+  def close
+    MainFiber.run do
+      unless @db.nil?
+        @db.not_nil!.close
+      end
+    end
+  end
+
+  def to_json(json : JSON::Builder)
+    json.string self
+  end
 end