deprecate `/_matrix/client/*/admin`

[richvdh]

Some of the admin API is exposed at various paths under /_matrix/client as well as /_synapse/admin. We should remove those paths to make it easier to lock down the admin api.

[richvdh]

the other paths are:

• /_matrix/client/api/v1/admin
• /_matrix/client/unstable/admin
• /_matrix/client/r0/admin

[richvdh]

The first step here is to announce our intention to remove the old paths in a changelog.

[anoadragon453]

The first step here is to announce our intention to remove the old paths in a changelog.

Should we do so in v1.20.0?

[turt2live]

note that at least one of those endpoints made it into the spec: https://matrix.org/docs/spec/client_server/r0.6.1#get-matrix-client-r0-admin-whois-userid

[richvdh]

note that at least one of those endpoints made it into the spec: https://matrix.org/docs/spec/client_server/r0.6.1#get-matrix-client-r0-admin-whois-userid

feh. we should replace and deprecate that too.

[anoadragon453]

I've added the release-blocker label to remind us to do put a note about this in v1.20.0.

[clokep]

Note that this essentially means removing historical_admin_path_patterns, which is an easy way to find them all. 👍

[anoadragon453]

A deprecation warning for this has been added in the changelog for release v1.20.0: https://github.com/matrix-org/synapse/blob/v1.20.0/CHANGES.md#synapse-1200-2020-09-22

[clokep]

A deprecation warning for this has been added in the changelog for release v1.20.0: https://github.com/matrix-org/synapse/blob/v1.20.0/CHANGES.md#synapse-1200-2020-09-22

Thanks! Do we have any thoughts on how long before removing it? E.g. v1.21.0 seems fast?