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40d699b1d4
Fixes https://github.com/element-hq/synapse/issues/19494 MSC4284 policy servers This: * removes the old `/check` (recommendation) support because it's from an older design. Policy servers should have updated to `/sign` by now. We also remove optionality around the policy server's public key because it was only optional to support `/check`. * supports the stable `m.room.policy` state event and `/sign` endpoints, falling back to unstable if required. Note the changes between unstable and stable: * Stable `/sign` uses errors instead of an empty signatures block to indicate refusal. * Stable `m.room.policy` nests the public key in an object with explicit key algorithm (always ed25519 for now) * does *not* introduce tests that the above fallback to unstable works. If it breaks, we're not going to be sad about an early transition. Tests can be added upon request, though. * fixes a bug where the policy server was asked to sign policy server state events (the events were correctly skipped in `is_event_allowed`, but `ask_policy_server_to_sign_event` didn't do the same). * fixes a bug where the original event sender's signature can be deleted if the sending server is the same as the policy server. * proxies Matrix-shaped errors from the policy server to the Client-Server API as `SynapseError`s (a new capability of the stable API). Membership event handling (from the issue) is expected to be a different PR due to the size of changes involved (tracked by https://github.com/element-hq/synapse/issues/19587). ### 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: turt2live <1190097+turt2live@users.noreply.github.com> Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com> Co-authored-by: Eric Eastwood <madlittlemods@gmail.com>