[Telepathy] [Bug 19589] New: Need a way for clients to know what kinds of channel can be handled.

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=19589

           Summary: Need a way for clients to know what kinds of channel can
                    be handled.
           Product: Telepathy
           Version: unspecified
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: medium
         Component: telepathy-spec
        AssignedTo: telepathy at lists.freedesktop.org
        ReportedBy: will.thompson at collabora.co.uk


Currently, a client can look at a Connection's RequestableChannelClasses
property to figure out what kinds of channels it can request. But this is not
necessarily useful:

* A CM might support channels with THT: Room, but that's not to say that
there's a client installed that can handle them. So a contact list UI might
look at RCC, see that rooms are available, and have a bunch of room-related UI
which is actually useless because any channels that get created will be
terminated with extreme prejudice by the dispatcher.
* A client can see that Gabble supports 1-1 stream tubes, but that doesn't help
it figure out what services to offer when you right-click a contact. It should
be able to have a "Play Tic-Tac-Tube" option.

This information is already present in the form of the union of all activatable
and running clients' HandlerChannelFilter properties, applied to the CM's
requestable channel classes. So maybe extra spec is unnecessary.

There's also a localization issue here: every contact list needs to know what
the human-readable description of service=tictactube is.


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