nsfwbot for Matrix

nsfwbot is a Matrix bot plugin that attempts to detect NSFW (Not Safe For Work) images posted in Matrix chat rooms. It uses nsfwdetection, which includes a small model that can run without a GPU with low resource requirements.

Features

• Image Analysis: Detects and analyses images posted in Matrix chats.
• Text Message Parsing: Analyses images embedded in text messages.
• Configurable Concurrency: Controls concurrent image processing tasks.
• Custom Actions: Configurable actions for detected content, including reporting and redacting messages.

Requirements

• Maubot: Runs within the Maubot framework.
• Python Dependencies: nsfwdetection and beautifulsoup4.

  Note: nsfwdetection will not run on Alpine Linux. This means the default Maubot Docker image will not work. I have built a custom Debian-based Maubot in the ghcr.io/tcpipuk/maubot:debian Docker image.

Installation

1. Use the Custom Maubot Docker Image: Replace the official Maubot image with a custom Debian-based image:

   docker pull ghcr.io/tcpipuk/maubot:debian

2. a. Install pre-prepared plugin from repository releases

   b. Clone the Repository:

   git clone https://github.com/tcpipuk/matrix-nsfwbot

   Zip the plugin files and upload through the Maubot admin interface. Ensure the plugin is configured and enabled.

3. Configure the Plugin: See configuration section below for a summary of settings in the Maubot UI.

Configuration

Edit base-config.yaml to set:

• max_concurrent_jobs: Number of concurrent jobs to allow.
• via_servers: List of servers for matrix.to URLs.
• actions:
  • ignore_sfw: Ignore SFW images (default: true).
  • redact_nsfw: Redact NSFW messages (default: false).
  • direct_reply: Reply directly in the same room (default: false).
  • report_to_room: Room ID for reporting (not enabled by default).

    Note: This can be a room alias (like #room:server) but this is far less efficient, as the bot will need to find the room ID (like !room:server) to send messages.

Usage

Once installed and configured, nsfwbot will automatically analyse images posted in the chat and reply with a classification result, e.g.

mxc://matrix.org/abcd1234 in https://matrix.to/#/!roomid:matrix.org/$eventid?via=matrix.org appears NSFW with score 87.93%

If multiple images are detected in a text message:

- mxc://matrix.org/abcd1234 in https://matrix.to/#/!roomid:matrix.org/$eventid?via=matrix.org appears SFW with score 2.45%
- mxc://matrix.org/efgh5678 in https://matrix.to/#/!roomid:matrix.org/$eventid?via=matrix.org appears NSFW with score 94.82%

Contributing

Contributions are welcome! Open an issue or submit a pull request on GitHub.

License

This project is licensed under the AGPLv3 License. See the LICENSE file for details.