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Setting up Mautrix Slack (optional)

Note: bridging to Slack can also happen via the mx-puppet-slack and matrix-appservice-slack bridges supported by the playbook.

For using as a Bot we recommend the Appservice Slack, because it supports plumbing.
For personal use with a slack account we recommend the mautrix-slack bridge (the one being discussed here), because it is the most fully-featured and stable of the 3 Slack bridges supported by the playbook. The mautrix-slack bridge (the one being discussed here) is the most fully-featured and stable of the 3 Slack bridges supported by the playbook, so it's the one we recommend.

The playbook can install and configure mautrix-slack for you.

See the project's documentation to learn what it does and why it might be useful to you.

Note that as of Oct 2022, support for multiple Matrix users using the bot is incomplete. Different users do not yet share the bridged channels. Everyone gets their own copy.

See the features and roadmap for more information.

Prerequisites

For using this bridge, you would need to authenticate by providing your username and password (legacy) or by using a token login. See more information in the docs.

Note that neither of these methods are officially supported by Slack. matrix-appservice-slack uses a Slack bot account which is the only Slack officially supported method for bridging a channel.

Installing

To enable the bridge, add this to your vars.yml file:

matrix_mautrix_slack_enabled: true

You may optionally wish to add some Additional configuration, or to prepare for double-puppeting before the initial installation.

After adjusting your vars.yml file, re-run the playbook and restart all services: ansible-playbook -i inventory/hosts setup.yml --tags=setup-all,start

To make use of the bridge, see Usage below.

Additional configuration

There are some additional things you may wish to configure about the bridge.

Take a look at:

roles/custom/matrix-bridge-mautrix-slack/defaults/main.yml for some variables that you can customize via your vars.yml file
roles/custom/matrix-bridge-mautrix-slack/templates/config.yaml.j2 for the bridge's default configuration. You can override settings (even those that don't have dedicated playbook variables) using the matrix_mautrix_slack_configuration_extension_yaml variable

Set up Double Puppeting

If you'd like to use Double Puppeting (hint: you most likely do), you have 2 ways of going about it.

Method 1: automatically, by enabling Shared Secret Auth

The bridge will automatically perform Double Puppeting if you enable Shared Secret Auth for this playbook.

This is the recommended way of setting up Double Puppeting, as it's easier to accomplish, works for all your users automatically, and has less of a chance of breaking in the future.

Method 2: manually, by asking each user to provide a working access token

Note: This method for enabling Double Puppeting can be configured only after you've already set up bridging (see Usage).

When using this method, each user that wishes to enable Double Puppeting needs to follow the following steps:

retrieve a Matrix access token for yourself. Refer to the documentation on how to do that.
send the access token to the bot. Example: login-matrix MATRIX_ACCESS_TOKEN_HERE
make sure you don't log out the Mautrix-Slack device some time in the future, as that would break the Double Puppeting feature

Usage

Start a chat with @slackbot:YOUR_DOMAIN (where YOUR_DOMAIN is your base domain, not the matrix. domain).
If you would like to login to Slack using a token, send the login-token command, otherwise, send the login-password command.
The bot should respond with "Successfully logged into for team "
Now that you're logged in, you can send a help command to the bot again, to see additional commands you have access to.
Slack channels should automatically begin bridging if you authenticated using a token. Otherwise, you must wait to receive a message in the channel if you used password authentication.

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