Draft: Add initial native Matrix Application Service bridge

Add initial native Matrix Application Service bridge

Part of https://gitlab.com/gitlab-org/gitter/webapp/-/issues/1684

Dev notes

To start out, I'm just copying stuff that I know was working in https://github.com/MadLittleMods/matrix-appservice-bridge-tutorial1

• https://github.com/matrix-org/matrix-appservice-bridge
  • https://matrix-org.github.io/matrix-appservice-bridge/2.3.0/classes/bridge.bridge.html
• https://github.com/matrix-org/matrix-appservice-node

Reference projects:

• https://github.com/matrix-org/matrix-appservice-slack
• https://github.com/matrix-org/matrix-appservice-irc
• https://github.com/matrix-org/matrix-bifrost/blob/develop/src/store/Store.ts
• https://github.com/Half-Shot/matrix-appservice-discord/blob/7fc714d36943e2591a828a8a6481db37119c3bdc/src/util.ts#L69

Todo

• Setup https://matrix.gitter.im subdomain -> https://gitlab.com/gitlab-com/gl-infra/infrastructure/-/issues/11616
• Update matrix-appservice-bridge after https://github.com/matrix-org/matrix-appservice-bridge/pull/270 merges
• Add secrets to secrets repo -> https://gitlab.com/gl-gitter/secrets/-/issues/2 -> https://gitlab.com/gl-gitter/secrets/-/merge_requests/38
  • matrix__bridge__id
  • matrix__bridge__hsToken
  • matrix__bridge__asToken
• Add gitter-registration.yaml to Gitter homeservers with same secrets
• How does Synapse handle the reconnecting to AS?
  • If the AS isn't available when Synapse starts up, does it still try to connect later?
  • Asked in https://gitlab.com/gitlab-org/gitter/webapp/-/merge_requests/2041#note_444562377
• Setup automatic AS registration of local dev Docker Synapse instance
• Add ban on Matrix-side when virtualUser gets banned -> https://gitlab.com/gitlab-org/gitter/webapp/-/issues/2629