> [!NOTE]
> Epic: [Efficient Server
Announcements](https://github.com/element-hq/synapse/issues/20240)
> Follows: https://github.com/element-hq/synapse/pull/20372
This PR first tests that every user can read the server announcements
through the "history" endpoints like
- [x] `GET /rooms/{roomId}/messages`
- [x] `GET /rooms/{roomId}/context/{eventId}`
- [x] `GET /rooms/{roomId}/event/{eventId}`
- [x] `GET /rooms/{roomId}/relations/{eventId}`
- [x] `GET /rooms/{roomId}/threads`
- [x] `GET /rooms/{roomId}/initialSync`
This already works for users who have never been in the room, because
announcement rooms are world-readable.
It doesn't for a sender who was removed from the room's config: Synapse
still uses their `leave` membership and shows them the room as it was
when they left.
This PR then treats a user who left a configured announcement room like
a user who has never been in it.
### Pull Request Checklist
<!-- Please read
https://element-hq.github.io/synapse/latest/development/contributing_guide.html
before submitting your pull request -->
* [x] Pull request is based on the develop branch
* [x] Pull request includes a [changelog
file](https://element-hq.github.io/synapse/latest/development/contributing_guide.html#changelog).
The entry should:
- Be a short description of your change which makes sense to users.
"Fixed a bug that prevented receiving messages from other servers."
instead of "Moved X method from `EventStore` to `EventWorkerStore`.".
- Use markdown where necessary, mostly for `code blocks`.
- End with either a period (.) or an exclamation mark (!).
- Start with a capital letter.
- Feel free to credit yourself, by adding a sentence "Contributed by
@github_username." or "Contributed by [Your Name]." to the end of the
entry.
* [x] [Code
style](https://element-hq.github.io/synapse/latest/code_style.html) is
correct (run the
[linters](https://element-hq.github.io/synapse/latest/development/contributing_guide.html#run-the-linters))
---------
Co-authored-by: Andrew Morgan <1342360+anoadragon453@users.noreply.github.com>
Co-authored-by: Quentin Gliech <quenting@element.io>
Andrew Morgan