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Drop-in server for Matrix URL previews, for servers like Dendrite that don't support them natively.
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README.md

Drop In URL previews server

A simple python server that handles /_matrix/media/*/preview_url requests, for servers like Dendrite.

Installation

Just use docker.

Or you can run it yourself, but that's your choice.

pip install -r requirements.txt
PREVIEW_HOMESERVER=https://example.com python3 server.py

Example docker-compose.yml

version: "3"
services:
  url_previews:
    environment:
      - "PREVIEW_HOMESERVER=https://matrix.nexy7574.co.uk"
    ports:
      - "2226:2226"
    restart: "unless-stopped"
    container_name: "dendrite-url-previews"
    volumes:
      - ./data/:/app/data/
    build: .  # there's no pre-built image

Configuration

The only configuration option is PREVIEW_HOMESERVER, which is the homeserver to use for the previews. If not specified, it defaults to the host name of the request URL, which may not work in some reverse-proxy environments.