* Drop support for delegating email validation

Delegating email validation to an IS is insecure (since it allows the owner of
the IS to do a password reset on your HS), and has long been deprecated. It
will now cause a config error at startup.

* Update unit test which checks for email verification

Give it an `email` config instead of a threepid delegate

* Remove unused method `requestEmailToken`

* Simplify config handling for email verification

Rather than an enum and a boolean, all we need here is a single bool, which
says whether we are or are not doing email verification.

* update docs

* changelog

* upgrade.md: fix typo

* update version number

this will be in 1.64, not 1.63

* update version number

this one too

The stack is already logged when waiting for an event to be un-partial
stated. Log the stack for rooms as well, to aid in debugging.

Cross-link doc pages for easier navigation.

This gets rid of another usage of get_appservice_by_req, with all the benefits, including correctly tracking the appservice IP and setting the tracing attributes correctly.

Signed-off-by: Quentin Gliech <quenting@element.io>

Signed-off-by: Ville Petteri Huh.

Inspired by the room batch handler, this uses previous event inserts to
pre-populate prev events during room creation, reducing the number of
queries required to create a room.

Signed off by Nick @ Beeper (@Fizzadar)

Uniformize spam-checker API, part 5: expand other spam-checker callbacks to return `Tuple[Codes, dict]` (#13044)

Signed-off-by: David Teller <davidt@element.io>
Co-authored-by: Brendan Abolivier <babolivier@matrix.org>

The field name was simply incorrect, leading to errors.

We want to be as up to date as possible, and sleeping doesn't help here
and can mean we fall behind.

* Fix appservice EDUs failing to send if the EDU doesn't have a room ID

As is in the case of presence.

* changelog

* linter

* fix linter again

See the documentation for the property here:
https://github.com/editorconfig/editorconfig/wiki/EditorConfig-Properties#max_line_length



Signed-off-by: Sumner Evans <me@sumnerevans.com>

Fixes #13196

Broke by #13005

Complement tests: https://github.com/matrix-org/complement/pull/405

This happens when you have some messages imported before the room is created.
Then use MSC3030 to look backwards before the room creation from a remote
federated server. The server won't find anything locally, but will ask over
federation which will have the remote event. The previous logic would
choke on not having the local event assigned.

```
Failed to fetch /timestamp_to_event from hs2 because of exception(UnboundLocalError) local variable 'local_event' referenced before assignment args=("local variable 'local_event' referenced before assignment",)
```

All tests are prefixed with `STALE_` and therefore they are silently
skipped. They were moved to `STALE_` in version `v0.5.0` in commit
2fcce3b3 - `Remove stale tests`.

Tests from `RoomEventsStoreTestCase` class are not used for last 8
years, I believe the best would be to remove them entirely.

Signed-off-by: Petr Vaněk <arkamar@atlas.cz>

Bounce recalculation of current state to the correct event persister and
move recalculation of current state into the event persistence queue, to
avoid concurrent updates to a room's current state.

Also give recalculation of a room's current state a real stream
ordering.

Signed-off-by: Sean Quah <seanq@matrix.org>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: David Robertson <davidr@element.io>

Check that `auto_vacuum` is disabled when porting a SQLite database to Postgres, as `VACUUM`s must not be performed between runs of the script. (#13195)

Method `_get_state_map_for_room` seems to break in presence of some ill-formed events in the database. Reimplementing this method to use `get_current_state`, which is more robust to such events.

This happened if we encountered a stream ordering in `event_push_actions` that had more rows than the batch size of the delete, as If we don't delete any rows in an iteration then the next time round we get the exact same stream ordering and get stuck.

Whenever we want to persist an event, we first compute an event context,
which includes the state at the event and a flag indicating whether the
state is partial. After a lot of processing, we finally try to store the
event in the database, which can fail for partial state events when the
containing room has been un-partial stated in the meantime.

We detect the race as a foreign key constraint failure in the data store
layer and turn it into a special `PartialStateConflictError` exception,
which makes its way up to the method in which we computed the event
context.

To make things difficult, the exception needs to cross a replication
request: `/fed_send_events` for events coming over federation and
`/send_event` for events from clients. We transport the
`PartialStateConflictError` as a `409 Conflict` over replication and
turn `409`s back into `PartialStateConflictError`s on the worker making
the request.

All client events go through
`EventCreationHandler.handle_new_client_event`, which is called in
*a lot* of places. Instead of trying to update all the code which
creates client events, we turn the `PartialStateConflictError` into a
`429 Too Many Requests` in
`EventCreationHandler.handle_new_client_event` and hope that clients
take it as a hint to retry their request.

On the federation event side, there are 7 places which compute event
contexts. 4 of them use outlier event contexts:
`FederationEventHandler._auth_and_persist_outliers_inner`,
`FederationHandler.do_knock`, `FederationHandler.on_invite_request` and
`FederationHandler.do_remotely_reject_invite`. These events won't have
the partial state flag, so we do not need to do anything for then.

The remaining 3 paths which create events are
`FederationEventHandler.process_remote_join`,
`FederationEventHandler.on_send_membership_event` and
`FederationEventHandler._process_received_pdu`.

We can't experience the race in `process_remote_join`, unless we're
handling an additional join into a partial state room, which currently
blocks, so we make no attempt to handle it correctly.

`on_send_membership_event` is only called by
`FederationServer._on_send_membership_event`, so we catch the
`PartialStateConflictError` there and retry just once.

`_process_received_pdu` is called by `on_receive_pdu` for incoming
events and `_process_pulled_event` for backfill. The latter should never
try to persist partial state events, so we ignore it. We catch the
`PartialStateConflictError` in `on_receive_pdu` and retry just once.

Refering to the graph of code paths in
https://github.com/matrix-org/synapse/issues/12988#issuecomment-1156857648


may make the above make more sense.

Signed-off-by: Sean Quah <seanq@matrix.org>

* Cast to postgres types when handling postgres db

* Remove unused method

* Easy annotations

* Annotate create_room

* Use `ParamSpec` to annotate looping_call

* Annotate `default_config`

* Track `now` as a float

`time_ms` returns an int like the proper Synapse `Clock`

* Introduce a `Timer` dataclass

* Introduce a Looper type

* Suppress checking of a mock

* tests.utils is typed

* Changelog

* Whoops, import ParamSpec from typing_extensions

* ditch the psycopg2 casts

Fix https://github.com/matrix-org/synapse/issues/4778

Complement tests: https://github.com/matrix-org/complement/pull/399

Add the ability to set the log level using the `SYNAPSE_TEST_LOG_LEVEL` environment when using `complement.sh`. (#13152)