The state res v2 algorithm only cares about the difference between auth
chains, so we can pass in the known common state to the `get_auth_chain`
storage function so that it can ignore those events.
* Increase DB/CPU perf of `_is_server_still_joined` check.
For rooms with large amount of state a single user leaving could cause
us to go and load a lot of membership events and then pull out
membership state in a large number of batches.
* Newsfile
* Update synapse/storage/persist_events.py
Co-Authored-By: Richard van der Hoff <1389908+richvdh@users.noreply.github.com>
* Fix adding if too soon
* Update docstring
* Review comments
* Woops typo
Co-authored-by: Richard van der Hoff <1389908+richvdh@users.noreply.github.com>
* Reject device display names that are too long.
Too long is currently defined as 100 characters in length.
* Add a regression test for rejecting a too long device display name.
==============================
Features
--------
- Filter out m.room.aliases from the CS API to mitigate abuse while a better solution is specced. ([\#6878](https://github.com/matrix-org/synapse/issues/6878))
Internal Changes
----------------
- Fix continuous integration failures with old versions of `pip`, which were introduced by a release of the `zipp` library. ([\#6880](https://github.com/matrix-org/synapse/issues/6880))
-----BEGIN PGP SIGNATURE-----
iQEzBAABCAAdFiEEv27Axt/F4vrTL/8QOSor00I9eP8FAl5BLBwACgkQOSor00I9
eP/9Ogf9HZ+XD5tt1uYkGqDSvUBS4sHdNcvxpNf1UMo6VaY4K5b9kF28MjY07ur2
nGq/nnLyLZZzwVXtV3q8upIdIK1hcMp2HCU0qDhEljepOkGmyQTqZooxrdrLTjPS
232bbifB6VFdK8P4gPIGopCRQI9a+TII4jODBobiJR43e0gEPfSREJKAnJs7DYaD
Quf3Svzu+jB+X8ymWLVbCFXuk4A4UqPzrRPb8TQBDN3w35G4JBDAgIpdxhQdJpdR
RIS1HgSm95P03doS23RLUjXuIpBfYveyStuGfPx4P9Lf30M2o6bxDeTPo2+IGbST
yhl1jB0l8Ve5/6veuTieA6vuXWU55g==
=2rgX
-----END PGP SIGNATURE-----
Merge tag 'v1.10.0rc3' into develop
Synapse 1.10.0rc3 (2020-02-10)
==============================
Features
--------
- Filter out m.room.aliases from the CS API to mitigate abuse while a better solution is specced. ([\#6878](https://github.com/matrix-org/synapse/issues/6878))
Internal Changes
----------------
- Fix continuous integration failures with old versions of `pip`, which were introduced by a release of the `zipp` library. ([\#6880](https://github.com/matrix-org/synapse/issues/6880))
We're in the middle of properly mitigating spam caused by malicious aliases being added to a room. However, until this work fully lands, we temporarily filter out all m.room.aliases events from /sync and /messages on the CS API, to remove abusive aliases. This is considered acceptable as m.room.aliases events were never a reliable record of the given alias->id mapping and were purely informational, and in their current state do more harm than good.
Erik Johnston