[Story] Request to join a room

[mxandreas]

Description

• As a user
• I want to see when access to a public room requires requesting access
• So that I can request access when I am interested in joining the room

The user either has a link to the room or finds the room in the public room directory; and can request access directly in the room directory listing or from the preview of the room (details in the designs).

Side note: if a user receives a link to a room with private visibility and knock or knock_restricted as a join rule, the join rule is not known (spec. limitation). Hence, the user is presented with a generic preview that has an optimistic option to join instead (already the behavior today), which will simply fail in case user needs an invite to this room or needs to knock.

Designs:

• Via room directory: iOS | Android | Web
• Via a link: iOS | Android | Web

Acceptance criteria

• User can request access to any room that:
  • The user has no current membership with (e.g. not knocking, not banned, not invited)
  • The room is public visibility-wise (but does not have to be listed in public directory)
  • The room's join rule is either knock or knock_restricted

Size estimate

None

Dependencies

• None

Out of scope

• Nothing

Open questions

Questions

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Subtasks

Android

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1. [Task] Request to join a (public) room element-x-android#3690
   T-Task +1
   
2. Show how many characters are remaining have been entered and how many are allowed. This was an update made to the designs after testing session.

iOS

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1. [Task] Request to join a (public) room element-x-ios#3420
   T-Task +1
   
2. Show how many characters are remaining have been entered and how many are allowed. This was an update made to the designs after testing session.

Rust

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1. ffi & sdk: add room knocking to Client matrix-org/matrix-rust-sdk#4080
   +0
2. chore(knocking): Add reason and server_names to Client::knock matrix-org/matrix-rust-sdk#4150
   +0
3. chore(room_preview): add RoomListItem::preview_room matrix-org/matrix-rust-sdk#4152
   +0

Other

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