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Fix 404 on /sync when the last event is a redaction of an unknown/purged event
#12905
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We don't need most of `filter_events_for_client`, and it actually gives us the wrong result in a number of cases. Instead, we just roll our own method for checking if the state should be visible.
We don't really need the event itself, so lets do without it.
... since the event itself is never used now.
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This should have tests, but I'm not going to write them tonight. |
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Tests now at matrix-org/complement#386. |
erikjohnston
approved these changes
Jun 1, 2022
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Thanks a lot for all of your work! |
Fizzadar
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Jun 15, 2022
Synapse 1.61.0 (2022-06-14) =========================== This release removes support for the non-standard feature known both as 'groups' and as 'communities', which have been superseded by *Spaces*. See [the upgrade notes](https://github.com/matrix-org/synapse/blob/develop/docs/upgrade.md#upgrading-to-v1610) for more details. Improved Documentation ---------------------- - Mention removed community/group worker endpoints in [upgrade.md](https://github.com/matrix-org/synapse/blob/develop/docs/upgrade.md#upgrading-to-v1610s). Contributed by @olmari. ([\matrix-org#13023](matrix-org#13023)) Synapse 1.61.0rc1 (2022-06-07) ============================== Features -------- - Add new `media_retention` options to the homeserver config for routinely cleaning up non-recently accessed media. ([\matrix-org#12732](matrix-org#12732), [\matrix-org#12972](matrix-org#12972), [\matrix-org#12977](matrix-org#12977)) - Experimental support for [MSC3772](matrix-org/matrix-spec-proposals#3772): Push rule for mutually related events. ([\matrix-org#12740](matrix-org#12740), [\matrix-org#12859](matrix-org#12859)) - Update to the `check_event_for_spam` module callback: Deprecate the current callback signature, replace it with a new signature that is both less ambiguous (replacing booleans with explicit allow/block) and more powerful (ability to return explicit error codes). ([\matrix-org#12808](matrix-org#12808)) - Add storage and module API methods to get monthly active users (and their corresponding appservices) within an optionally specified time range. ([\matrix-org#12838](matrix-org#12838), [\matrix-org#12917](matrix-org#12917)) - Support the new error code `ORG.MATRIX.MSC3823.USER_ACCOUNT_SUSPENDED` from [MSC3823](matrix-org/matrix-spec-proposals#3823). ([\matrix-org#12845](matrix-org#12845), [\matrix-org#12923](matrix-org#12923)) - Add a configurable background job to delete stale devices. ([\matrix-org#12855](matrix-org#12855)) - Improve URL previews for pages with empty elements. ([\matrix-org#12951](matrix-org#12951)) - Allow updating a user's password using the admin API without logging out their devices. Contributed by @jcgruenhage. ([\matrix-org#12952](matrix-org#12952)) Bugfixes -------- - Always send an `access_token` in `/thirdparty/` requests to appservices, as required by the [Application Service API specification](https://spec.matrix.org/v1.1/application-service-api/#third-party-networks). ([\matrix-org#12746](matrix-org#12746)) - Implement [MSC3816](matrix-org/matrix-spec-proposals#3816): sending the root event in a thread should count as having 'participated' in it. ([\matrix-org#12766](matrix-org#12766)) - Delete events from the `federation_inbound_events_staging` table when a room is purged through the admin API. ([\matrix-org#12784](matrix-org#12784)) - Fix a bug where we did not correctly handle invalid device list updates over federation. Contributed by Carl Bordum Hansen. ([\matrix-org#12829](matrix-org#12829)) - Fix a bug which allowed multiple async operations to access database locks concurrently. Contributed by @sumnerevans @ Beeper. ([\matrix-org#12832](matrix-org#12832)) - Fix an issue introduced in Synapse 0.34 where the `/notifications` endpoint would only return notifications if a user registered at least one pusher. Contributed by Famedly. ([\matrix-org#12840](matrix-org#12840)) - Fix a bug where servers using a Postgres database would fail to backfill from an insertion event when MSC2716 is enabled (`experimental_features.msc2716_enabled`). ([\matrix-org#12843](matrix-org#12843)) - Fix [MSC3787](matrix-org/matrix-spec-proposals#3787) rooms being omitted from room directory, room summary and space hierarchy responses. ([\matrix-org#12858](matrix-org#12858)) - Fix a bug introduced in Synapse 1.54.0 which could sometimes cause exceptions when handling federated traffic. ([\matrix-org#12877](matrix-org#12877)) - Fix a bug introduced in Synapse 1.59.0 which caused room deletion to fail with a foreign key violation error. ([\matrix-org#12889](matrix-org#12889)) - Fix a long-standing bug which caused the `/messages` endpoint to return an incorrect `end` attribute when there were no more events. Contributed by @Vetchu. ([\matrix-org#12903](matrix-org#12903)) - Fix a bug introduced in Synapse 1.58.0 where `/sync` would fail if the most recent event in a room was a redaction of an event that has since been purged. ([\matrix-org#12905](matrix-org#12905)) - Fix a potential memory leak when generating thumbnails. ([\matrix-org#12932](matrix-org#12932)) - Fix a long-standing bug where a URL preview would break if the image failed to download. ([\matrix-org#12950](matrix-org#12950)) Improved Documentation ---------------------- - Fix typographical errors in documentation. ([\matrix-org#12863](matrix-org#12863)) - Fix documentation incorrectly stating the `sendToDevice` endpoint can be directed at generic workers. Contributed by Nick @ Beeper. ([\matrix-org#12867](matrix-org#12867)) Deprecations and Removals ------------------------- - Remove support for the non-standard groups/communities feature from Synapse. ([\matrix-org#12553](matrix-org#12553), [\matrix-org#12558](matrix-org#12558), [\matrix-org#12563](matrix-org#12563), [\matrix-org#12895](matrix-org#12895), [\matrix-org#12897](matrix-org#12897), [\matrix-org#12899](matrix-org#12899), [\matrix-org#12900](matrix-org#12900), [\matrix-org#12936](matrix-org#12936), [\matrix-org#12966](matrix-org#12966)) - Remove contributed `kick_users.py` script. This is broken under Python 3, and is not added to the environment when `pip install`ing Synapse. ([\matrix-org#12908](matrix-org#12908)) - Remove `contrib/jitsimeetbridge`. This was an unused experiment that hasn't been meaningfully changed since 2014. ([\matrix-org#12909](matrix-org#12909)) - Remove unused `contrib/experiements/cursesio.py` script, which fails to run under Python 3. ([\matrix-org#12910](matrix-org#12910)) - Remove unused `contrib/experiements/test_messaging.py` script. This fails to run on Python 3. ([\matrix-org#12911](matrix-org#12911)) Internal Changes ---------------- - Test Synapse against Complement with workers. ([\matrix-org#12810](matrix-org#12810), [\matrix-org#12933](matrix-org#12933)) - Reduce the amount of state we pull from the DB. ([\matrix-org#12811](matrix-org#12811), [\matrix-org#12964](matrix-org#12964)) - Try other homeservers when re-syncing state for rooms with partial state. ([\matrix-org#12812](matrix-org#12812)) - Resume state re-syncing for rooms with partial state after a Synapse restart. ([\matrix-org#12813](matrix-org#12813)) - Remove Mutual Rooms' ([MSC2666](matrix-org/matrix-spec-proposals#2666)) endpoint dependency on the User Directory. ([\matrix-org#12836](matrix-org#12836)) - Experimental: expand `check_event_for_spam` with ability to return additional fields. This enables spam-checker implementations to experiment with mechanisms to give users more information about why they are blocked and whether any action is needed from them to be unblocked. ([\matrix-org#12846](matrix-org#12846)) - Remove `dont_notify` from the `.m.rule.room.server_acl` rule. ([\matrix-org#12849](matrix-org#12849)) - Remove the unstable `/hierarchy` endpoint from [MSC2946](matrix-org/matrix-spec-proposals#2946). ([\matrix-org#12851](matrix-org#12851)) - Pull out less state when handling gaps in room DAG. ([\matrix-org#12852](matrix-org#12852), [\matrix-org#12904](matrix-org#12904)) - Clean-up the push rules datastore. ([\matrix-org#12856](matrix-org#12856)) - Correct a type annotation in the URL preview source code. ([\matrix-org#12860](matrix-org#12860)) - Update `pyjwt` dependency to [2.4.0](https://github.com/jpadilla/pyjwt/releases/tag/2.4.0). ([\matrix-org#12865](matrix-org#12865)) - Enable the `/account/whoami` endpoint on synapse worker processes. Contributed by Nick @ Beeper. ([\matrix-org#12866](matrix-org#12866)) - Enable the `batch_send` endpoint on synapse worker processes. Contributed by Nick @ Beeper. ([\matrix-org#12868](matrix-org#12868)) - Don't generate empty AS transactions when the AS is flagged as down. Contributed by Nick @ Beeper. ([\matrix-org#12869](matrix-org#12869)) - Fix up the variable `state_store` naming. ([\matrix-org#12871](matrix-org#12871)) - Faster room joins: when querying the current state of the room, wait for state to be populated. ([\matrix-org#12872](matrix-org#12872)) - Avoid running queries which will never result in deletions. ([\matrix-org#12879](matrix-org#12879)) - Use constants for EDU types. ([\matrix-org#12884](matrix-org#12884)) - Reduce database load of `/sync` when presence is enabled. ([\matrix-org#12885](matrix-org#12885)) - Refactor `have_seen_events` to reduce memory consumed when processing federation traffic. ([\matrix-org#12886](matrix-org#12886)) - Refactor receipt linearization code. ([\matrix-org#12888](matrix-org#12888)) - Add type annotations to `synapse.logging.opentracing`. ([\matrix-org#12894](matrix-org#12894)) - Remove PyNaCl occurrences directly used in Synapse code. ([\matrix-org#12902](matrix-org#12902)) - Bump types-jsonschema from 4.4.1 to 4.4.6. ([\matrix-org#12912](matrix-org#12912)) - Rename storage classes. ([\matrix-org#12913](matrix-org#12913)) - Preparation for database schema simplifications: stop reading from `event_edges.room_id`. ([\matrix-org#12914](matrix-org#12914)) - Check if we are in a virtual environment before overriding the `PYTHONPATH` environment variable in the demo script. ([\matrix-org#12916](matrix-org#12916)) - Improve the logging when signature checks on events fail. ([\matrix-org#12925](matrix-org#12925)) # -----BEGIN PGP SIGNATURE----- # # iQFEBAABCgAuFiEEBTGR3/RnAzBGUif3pULk7RsPrAkFAmKoaa0QHGVyaWtAbWF0 # cml4Lm9yZwAKCRClQuTtGw+sCVn3B/sF8hdhrZ7hWW40ST3eG9cEKNFrj/xZXiaI # zho3ryrxaQF68BSKot15AvZSprEdwBXWrb8WeTjyw+QH7vTKrCQDZ0p7qubn10Z7 # BuKq9hyYjyCLjBZrgy8d4U3Y8gsSByuO59YKHNLn+UTJLOs5GTH8Wprwh4mpU3Jl # +o+cC+lMSVcyZij2hihFymcSxWq/I9WL0dsjRif8x0BUQwRXwmXc6+mhlgLBe2Zs # 2dUouzJ8NVZcjfWvsg4noXPrNQ/IiyCVZlSIgaDftDIxVSPk5/rXiUUNex8Tn1+I # TnOgnXhpOQD1vwVGYS8LrcfA0ubSili7xUJ8k2e5TkCjpkaVnYNu # =q+7N # -----END PGP SIGNATURE----- # gpg: Signature made Tue Jun 14 11:57:49 2022 BST # gpg: using RSA key 053191DFF4670330465227F7A542E4ED1B0FAC09 # gpg: issuer "[email protected]" # gpg: WARNING: server 'dirmngr' is older than us (2.2.34 < 2.3.6) # gpg: Note: Outdated servers may lack important security fixes. # gpg: Note: Use the command "gpgconf --kill all" to restart them. # gpg: Can't check signature: No public key # Conflicts: # docs/workers.md # synapse/handlers/message.py # synapse/handlers/pagination.py # synapse/push/bulk_push_rule_evaluator.py # synapse/push/push_rule_evaluator.py # synapse/rest/client/receipts.py # synapse/storage/databases/main/appservice.py # tests/push/test_push_rule_evaluator.py
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Currently, we try to pull the event corresponding to a sync token from the database. However, when we fetch redaction events, we check the target of that redaction (because we aren't allowed to send redactions to clients without validating them). So, if the sync token points to a redaction of an event that we don't have, we have a problem.
It turns out we don't really need that event, and can just work with its ID and metadata, which sidesteps the whole problem.
Based on #12904.
Fixes #12864