This is useful to allow room admins to quickly deal with a large number
of abusive messages.

Use account_threepid_delegate for 3pid validation

Only count real users when checking for auto-creation of auto-join room

Censor redactions in DB after a month

Signed-off-by: Jason Robinson <jasonr@matrix.org>

Add opentracing span for HTTP push

Signed-off-by: Jason Robinson <jasonr@matrix.org>

Signed-off-by: Jason Robinson <jasonr@matrix.org>

Signed-off-by: Jason Robinson <jasonr@matrix.org>

Previously if the first registered user was a "support" or "bot" user,
when the first real user registers, the auto-join rooms were not
created.

Fix to exclude non-real (ie users with a special user type) users
when counting how many users there are to determine whether we should
auto-create a room.

Signed-off-by: Jason Robinson <jasonr@matrix.org>

`sid` is required to be part of `three_pid_creds`. We were 500'ing if it wasn't provided instead of returning `M_MISSING_PARAM`.

Correctly handle non-bool m.federate flag

Move get_threepid_validation_session and delete_threepid_session into RegistrationWorkerStore

Fix destructuring assumption bug with using load_jinja2_templates

Co-Authored-By: Erik Johnston <erik@matrix.org>

Don't assume there is a 'self' arg in @trace decorator

Allow Synapse to send registration emails + choose Synapse or an external server to handle 3pid validation (#5987)

This is a combination of a few different PRs, finally all being merged into `develop`:

* #5875 
* #5876 
* #5868 (This one added the `/versions` flag but the flag itself was actually [backed out](https://github.com/matrix-org/synapse/commit/891afb57cbdf9867f2848341b29c75d6f35eef5a#diff-e591d42d30690ffb79f63bb726200891) in #5969. What's left is just giving /versions access to the config file, which could be useful in the future)
* #5835 
* #5969 
* #5940

Clients should not actually use the new registration functionality until https://github.com/matrix-org/synapse/pull/5972 is merged.

UPGRADE.rst, changelog entries and config file changes should all be reviewed closely before this PR is merged.