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{{Developers}} |
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Clique is the protocol (formerly called rMulticast) used by [[telepathy-salut]] to implement multi-user chat on Link Local XMPP. |
Clique is the protocol (formerly called rMulticast) used by [[telepathy-salut]] to implement multi-user chat on Link Local XMPP. |
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See [http://telepathy.freedesktop.org/xmpp/clique.html XEP-proto-clique] for the HTML document derived from the latest telepathy-salut docs/clique.xml |
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=Introduction= |
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Clique is an extension of XEP-0174 to support multi-user chat. It consists of the following components: |
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* a binary multicast message-passing protocol sometimes referred to as rMulticast, with retransmission/reliability, fragmentation/reassembly, causal ordering, and reliable membership semantics, in which messages are associated with a stream ID in the range 0 to 65535 |
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* XMPP-like XML messages sent with stream ID 0 |
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* optional auxiliary data (e.g. Tubes) sent with stream IDs 1-65535, with semantics signalled by XML messages in stream 0 |
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The chat room behaves a lot like XMPP, and namespaces used in XMPP have their usual semantics. However, instead of a stream of XML as in XMPP, Clique's XMPP-like messages are individually well-formed XML documents. |
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XEP-0174 instance names are used for identification in a chat room. |
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The Clique XML namespace can also be used for certain elements sent over XEP-0174 unicast TCP streams, for instance to send invitations. |
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=Use Cases= |
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FIXME: there need to be some examples of the actual Clique protocol here |
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==Advertising a public link-local chatroom via mDNS== |
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In this example a chatroom called "Witchcraft" uses the multicast group 239.255.71.66, port 13251 (arbitrarily chosen). |
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We recommend that chatrooms use a random high port number in a random multicast group in the range 239.255.71.x. |
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; A dummy A record for the chatroom's multicast group |
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Witchcraft._clique._udp.local. IN A 239.255.71.66 |
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; A DNS-SD service of type _clique._udp |
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_clique._udp.local. IN PTR Witchcraft._clique._udp.local. |
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Witchcraft._clique._udp.local. IN SRV 13251 ._clique._udp.local. |
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; For future expansion - implementations SHOULD NOT resolve this, |
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; unless they implement a future version of this protocol that |
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; defines some TXT keys for _clique._udp |
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Witchcraft._clique._udp.local. IN TXT "txtvers=0" |
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==Inviting a contact to a public or private room== |
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In this example crone@desktop invites hecate@broom to the chatroom given above. |
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This would work just as well if the chatroom was not advertised in mDNS; this can be used to make "private" chatrooms. Note however that anyone with a network traffic sniffer can see the chatroom itself. |
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<!-- Sent via XEP-0174 unicast TCP from crone@desktop to |
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hecate@broom --> |
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<message from='crone@desktop' to='hecate@broom'> |
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<invite xmlns='http://telepathy.freedesktop.org/xmpp/clique'> |
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<roomname>Witchcraft</roomname> |
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<address>239.255.71.66</address> |
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<port>13251</port> |
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<!-- reason is optional --> |
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<reason>We need to plot Macbeth's doom, but the XMPP server is |
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down</reason> |
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</invite> |
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<!-- Displayed by iChat and other non-Clique-compatible clients --> |
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<body>You got a Clique chatroom invitation</body> |
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</message> |
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[[Category:Telepathy]] |
[[Category:Telepathy]] |
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Latest revision as of 09:33, 1 January 2009
For Developers
Clique is the protocol (formerly called rMulticast) used by telepathy-salut to implement multi-user chat on Link Local XMPP.
See XEP-proto-clique for the HTML document derived from the latest telepathy-salut docs/clique.xml