Matrix <--> Zulip bridge

This acts as a bridge between Matrix and Zulip.

Enhanced Features

Supporting multiple (Zulip topic, Matrix channel)-pairs.
Handling files according to their mimetype.

Installation

Run pip install -r requirements.txt in order to install the requirements.

In case you'd like encryption to work, you need pip to install the matrix-nio package with e2e support:

First, you need to make sure that the development files of the libolm C-library are installed on your system! See the corresponding documentation of matrix-nio for further information on this point.
pip install matrix-nio[e2e]

Steps to configure the Matrix bridge

To obtain a configuration file template, run the script with the --write-sample-config option to obtain a configuration file to fill in the details mentioned below. For example:

If you installed the zulip package: zulip-matrix-bridge --write-sample-config matrix_bridge.conf
If you are running from the Zulip GitHub repo: python matrix_bridge.py --write-sample-config matrix_bridge.conf

1. Zulip endpoint

Create a generic Zulip bot, with a full name such as Matrix Bot.
The bot is able to subscribe to the necessary streams itself if they are public. (Note that the bridge will not try to create streams in case they do not already exist. In that case, the bridge will fail at startup.) Otherwise, you need to add the bot manually.
In the zulip section of the configuration file, enter the bot's zuliprc details (email, api_key, and site).
In the same section, also enter the Zulip stream and topic.

2. Matrix endpoint

Create a user on the matrix server of your choice, e.g. matrix.org, preferably with a descriptive name such as zulip-bot.
In the matrix section of the configuration file, enter the user's Matrix user ID mxid and password. Please use the Matrix user ID (MXID) as format for the username!
Create the Matrix room(s) to be bridged in case they do not exits yet. Remember to invite the bot to private rooms! Otherwise, this error will be thrown: Matrix bridge error: JoinError: M_UNKNOWN No known servers.
Enter the host and room_id into the same section. In case the room is private you need to use the Internal room ID which has the format !aBcDeFgHiJkLmNoPqR:example.org. In the official Matrix client Element, you can find this Internal room ID in the Room Settings under Advanced.

Adding more (Zulip topic, Matrix channel)-pairs

Create a new section with a name starting with additional_bridge.
Add a room_id for the Matrix side and a stream and a topic for the Zulip side.

Example:

[additional_bridge1]
room_id = #zulip:matrix.org
stream = matrix test
topic = matrix test topic

Running the bridge

After the steps above have been completed, assuming you have the configuration in a file called matrix_bridge.conf:

If you installed the zulip package: run zulip-matrix-bridge -c matrix_bridge.conf
If you are running from the Zulip GitHub repo: run python matrix_bridge.py -c matrix_bridge.conf

Notes regarding IRC

Usage for IRC bridges

This can also be used to indirectly bridge between IRC and Zulip.

Matrix has been bridged to the listed IRC networks, where the 'Room alias format' refers to the room_id for the corresponding IRC channel.

For example, for the Libera Chat channel #zulip-test, the room_id would be #zulip-test:libera.chat.

Caveats for IRC mirroring

There are certain IRC channels where the Matrix.org IRC bridge has been banned for technical reasons. You can't mirror those IRC channels using this integration.

TODO

Adding support for editing and deleting messages?
Handling encryption on the Matrix side (may need further discussion).

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