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Jeremy Daer
5c5c82b27a
Rooms::DirectsController relaxes ensure_can_administer to true, because every participant in a direct room may administer it. set_room was inherited unscoped, though, so that relaxation applied to any room the caller was merely a member of: DELETE /rooms/directs/<id> destroyed open and closed rooms and all their messages. The same unscoped lookup let a direct room be loaded by the opens and closeds controllers, where force_room_type promoted it. Promoting a DM to open grants every user on the account membership and republishes the whole conversation, including the other participant's messages; converting it to closed lets the initiator revise who is in it and lock the other participant out. Each controller now narrows room_scope to the types it may act on. Opens and closeds keep reach into each other, since converting between them is a feature. Neither can reach a direct room, and directs can only reach directs. Room also refuses to change type away from Rooms::Direct, so the invariant holds for any future caller of becomes! rather than only these two controllers.