Fixes: #8393

... because namedtuples suck

Fix up a couple of other annotations to keep mypy happy.

We either need to pass the auth provider over the replication api, or make sure
we report the auth provider on the worker that received the request. I've gone
with the latter.

Mention that parse_config must exist and note the
check_media_file_for_spam method.

This uses a simplified version of get_chain_cover_difference to calculate
auth chain of events.

This is a companion change to apply the fix in #9498 /
922788c6 to previously
purged rooms.

Earlier [I was convinced](https://github.com/matrix-org/synapse/issues/9565) that we didn't have an Admin API for listing media uploaded by a user. Foolishly I was looking under the Media Admin API documentation, instead of the User Admin API documentation.

I thought it'd be helpful to link to the latter so others don't hit the same dead end :)

Apple had to be special. They want a client secret which is generated from an EC key.

Fixes #9220. Also fixes #9212 while I'm here.

Fixes #8915

Type hint fixes due to Twisted 21.2.0 adding type hints.

Properly uses RGBA mode for 1- and 8-bit images with transparency
(instead of RBG mode).

The hashes are from commits due to auto-formatting, e.g. running black.

git can be configured to use this automatically by running the following:

    git config blame.ignoreRevsFile .git-blame-ignore-revs

After 0764d0c6

I noticed that I'd occasionally have `scripts-dev/lint.sh` fail when messing about with config options in my PR. The script calls `scripts-dev/config-lint.sh`, which attempts some validation on the sample config.

 It does this by using `sed` to edit the sample_config, and then seeing if the file changed using `git diff`.

The problem is: if you changed the sample_config as part of your commit, this script will error regardless.

This PR attempts to change the check so that existing, unstaged changes to the sample_config will not cause the script to report an invalid file.

This notice is giving a heads up to the planned spec compliance fix https://github.com/matrix-org/synapse/pull/9548.

Unfortunately this doesn't test re-joining the room since
that requires having another homeserver to query over
federation, which isn't easily doable in unit tests.

This helps fix some type hints when running with Twisted 21.2.0.

Update reverse proxy to add OpenBSD relayd example configuration.

Signed-off-by: Leo Bärring <leo.barring@protonmail.com>

Following the advice at
https://prometheus.io/docs/practices/instrumentation/#timestamps-not-time-since,
it's preferable to export unix timestamps, not ages.

There doesn't seem to be any particular naming convention for timestamp
metrics.

Add prom metrics for number of users successfully registering and logging in, by SSO provider.

This great big stack of commits is a a whole load of hoop-jumping to make it easier to store additional values in login tokens, and then to actually store the SSO Identity Provider in the login token. (Making use of that data will follow in a subsequent PR.)

Should fix some remaining warnings

Turns out matrix.org has an event that has duplicate auth events (which really isn't supposed to happen, but here we are). This caused the background update to fail due to `UniqueViolation`.