Add room ban support to virtualUsers

Add room ban support to virtualUsers

• Fix https://gitlab.com/gitlab-org/gitter/webapp/-/issues/2615
• Fix https://gitlab.com/gitlab-org/gitter/webapp/-/issues/2627

MR where we originally introduced virtualUsers: https://gitlab.com/gitlab-org/gitter/webapp/-/merge_requests/2027

Dev notes

We can assume that any username with a : is a Matrix username

$ ssh mongo-replica-02.prod.gitter
$ mongo gitter
> rs.slaveOk()
> db.users.find({ username: { $regex: /.*:.*/ } });

# gives no results

Todo

• Add bans
• Remove bans
• findBanByUsername
• scripts/utils/ban-user-from-room.js
• How to deal with policy (related to https://gitlab.com/gitlab-org/gitter/webapp/-/issues/2041)
• Stop new messages and edits from going through
• Tests
• Fix integration activity so it handles the virtualUser ban events -> https://gitlab.com/gitlab-org/gitter/gitter-marked/-/merge_requests/12
  • Currently the mention is half-broken:

---

• We're going to move to straight MXID's instead of @matrix->asdf.matrix.org, https://gitlab.com/gitlab-org/gitter/webapp/-/issues/2617#what-does-a-mention-look-like-for-a-matrix-virtualuser
• Revert https://gitlab.com/gitlab-org/gitter/gitter-marked/-/merge_requests/12
  • -> https://gitlab.com/gitlab-org/gitter/gitter-marked/-/merge_requests/14
• Update this MR with this change

Testing strategy

1. Use the ban slash command in the chat input for a virtualUser: /ban @ewafewafewaf:bad.org
2. Use the unban slash command in the chat input for a virtualUser: /unban @ewafewafewaf:bad.org