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Clarify the semantics of the enable_authenticated_media configuration option. (#17913)

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Signed-off-by: Olivier 'reivilibre <oliverw@matrix.org>
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changelog.d/17913.doc Normal file
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Clarify the semantics of the `enable_authenticated_media` configuration option.

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docs/usage/configuration/config_documentation.md
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@ -1890,6 +1890,26 @@ unauthenticated media endpoints (`/_matrix/media/(r0|v3|v1)/download` and `/_mat
after enabling, media marked as authenticated will be available over legacy endpoints. Defaults to false, but
this will change to true in a future Synapse release.
In all cases, authenticated requests to download media will succeed, but for unauthenticated requests, this
case-by-case breakdown describes whether media downloads are permitted:
* `enable_authenticated_media = False`:
* unauthenticated client or homeserver requesting local media: allowed
* unauthenticated client or homeserver requesting remote media: allowed as long as the media is in the cache,
or as long as the remote homeserver does not require authentication to retrieve the media
* `enable_authenticated_media = True`:
* unauthenticated client or homeserver requesting local media:
allowed if the media was stored on the server whilst `enable_authenticated_media` was `False` (or in a previous Synapse version where this option did not exist);
otherwise denied.
* unauthenticated client or homeserver requesting remote media: the same as for local media;
allowed if the media was stored on the server whilst `enable_authenticated_media` was `False` (or in a previous Synapse version where this option did not exist);
otherwise denied.
It is especially notable that media downloaded before this option existed (in older Synapse versions), or whilst this option was set to `False`,
will perpetually be available over the legacy, unauthenticated endpoint, even after this option is set to `True`.
This is for backwards compatibility with older clients and homeservers that do not yet support requesting authenticated media;
those older clients or homeservers will not be cut off from media they can already see.
Example configuration:
```yaml
enable_authenticated_media: true