Chat integration

[danxuliu]

Nextcloud 13

Must have:

• Basic chat: tab in the right sidebar of the Spreed app for each room; follow appearance of comments tab in Files app. Messages are stored in database.
  • Define API.
  • Basic backend with short polling in the server (Add basic backend for chat #429).
  • Basic frontend in Spreed app using long polling to the server. (Add basic frontend for chat #462)

Nice to have:

• More advanced backend using shared memory and semaphores to send messages between PHP processes and avoid needing to poll the database; check if there is any other higher level PHP extension or library that could be used.

• Notifications are sent to users when their name is mentioned. (Notify users mentioned in chat messages #460)

• Chat messages are searchable.

Future:

• Federation, so people in the same chat room can be on different Nextcloud servers.

• Make possible to connect to the chat from third-party clients, like XMPP or Matrix.

• Nextcloud integration, like starting a chat from the contacts app.

• One on one chat available over any Nextcloud app.

• Advanced display of content in the chat view, like previews of photos.

[nickvergessen]

Closing the 13 ticket, since the must haves are in (apart from #544 )