YTAP

Telegram bot that downloads audio from YouTube and sends it to the user as an audio file. You can try it now!

Dependencies and requirements

• Unix-like OS — Ubuntu, Debian, CentOS or macOS — that's all should work;
• JDK 11 is minimal (I guess... Actually I'm using AdoptOpenJDK 14);
• Maven;
• Telgrambots library;
• YouTube-DL installed;
• FFmpeg installed;

Getting started

0. Install JDK. I use AdoptOpenJDK14 with OpenJ9 VM.

1. Clone repository. If you are using an IntelliJ IDEA, you can grab all project directly from GitHub by link.

2. Add telegrambots dependency in your pom.xml:

<dependency>
    <groupId>org.telegram</groupId>
    <artifactId>telegrambots</artifactId>
    <version>4.9</version>
</dependency>

I also recommend using compiler source and target for Maven:

<properties>
    <maven.compiler.source>14</maven.compiler.source>
    <maven.compiler.target>14</maven.compiler.target>
</properties>

3. Create files name.txt and token.txt in working directory. Add a bot name and token, according to the file names. If you don't have it ask @BotFather at Telegram.

4. Create an empty ./audio directory.

The end result should be something like this:

5. Install youtube-dl. You can do that from system package manager, but packages may be quite old (except brew on Mac and pacman in Arch). Here is a better way to install the latest version. Make sure, that you can call youtube-dl from /usr/local/bin/youtube-dl. If not, create a symlink.

6. Install FFmpeg. You can use your system package manager here.

7. Build the project with any available method. I use an artifact (JAR) build with IntelliJ IDEA.

8. [Optional] If you deploy your bot to VPS, you probably want to run it in the background. You can use nohup for that, but better way would be a Systemd service.

1. Create in *.service file in /etc/systemd/system/. For example, it would be ytap.service.
2. Your service may look like that:

   [Unit]
   Description=Manage Java ytap service
   [Service]
   WorkingDirectory=/var/www/telegrambots/ytap/
   ExecStart=/bin/java -jar YTAP.jar
   User=ytap
   Type=simple
   Restart=on-failure
   RestartSec=10
   [Install]
   WantedBy=multi-user.target
   

3. Save ytap.service file, restart systemd, enable service and start it:

   $ sudo systemctl daemon-reload
   $ sudo systemctl enable ytap.service
   $ sudo systemctl start ytap.service

Now your bot runs in background, automatically restarts on failure and after server reboot.

9. [Optional] Add a cron job to regularly update youtube-dl. This will prevent errors related to YouTube changes. The cron job looks like this:

0 3 * * * /usr/local/bin/youtube-dl -U >> /var/www/telegrambots/ytap/bot.log

If there is a problem with the update, the information will be logged.