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opendesk/docs/enhanced-configuration/matrix-federation.md

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SPDX-FileCopyrightText: 2024 Zentrum für Digitale Souveränität der Öffentlichen Verwaltung (ZenDiS) GmbH
SPDX-License-Identifier: Apache-2.0
-->
<h1>Matrix federation</h1>
<!-- TOC -->
* [Context](#context)
* [Example configuration](#example-configuration)
* [Disable federation](#disable-federation)
* [Separate Matrix domain](#separate-matrix-domain)
<!-- TOC -->
The Element chat application and its server component Synapse are based on the Matrix protocol,
that supports federation with other Matrix servers to communicate with the users with accounts on these servers.
By default, you can chat with users who have an account within your openDesk installation and federate with other
matrix-based servers.
Federation support can be turned off.
# Example configuration
The following values are used in this example documentation.
Please ensure when you come across such a value,
even if it is part of a URL hostname or path, that you adapt it where needed to your setup:
- `opendesk.domain.tld`: the mandatory `DOMAIN` setting for your deployment resulting in
`https://chat.opendesk.domain.tld` for access to the Element chat.
- `my_organization.tld`: an optional alternative domain used for mail and/or Matrix.
It is also set to `opendesk.domain.tld` if not used.
## Disable federation
The following setting can turn off federation:
```yaml
functional:
  externalServices:
    matrix:
      federation:
        enabled: false
```
## Separate Matrix domain
If you want to federate with other Matrix instances and use a separate Matrix domain, you need to provide a JSON file on
the Matrix domain to use delegation. It is not part of your openDesk deployment.
Domain path: `https://my_organization.tld/.well-known/matrix/server`
Content:
```JSON
{
    "m.server": "matrix-federation.opendesk.domain.tld:443"
}
```
More detailed information can be found in Matrix/Synapse documentation:
[Matrix Delegation](https://element-hq.github.io/synapse/latest/delegate.html)