xep-0047 (in-band file transfer) plugin patch

[macdiesel]

I've created a plugin for xep-0047 (in-band file transfer/byte streams).
http://xmpp.org/extensions/xep-0047.html

The plugin can be found here: http://github.com/macdiesel/SleekXMPP/blob/master/sleekxmpp/plugins/xep_0047.py

No other changes are necessary for this plugin to work, everything for xep_0047 is self contained in this package.

From the inline doc: In-band file transfer for xmpp.

Currently only IQ transfer is supported

Plugin will not accept a file transfer if the sender or recipient JID is the
same as the currently logged in JID.

Plugin configuration options:
acceptTransfers        - Boolean     - Sets the plugin to either accept or deny transfers
saveDirectory          - String      - The default directory that incoming file transfers will be saved in
saveNamePrefix         - String      - Prefix that will be prepended to the saved file name of an incoming transfer
overwriteFile          - Boolean     - If an incoming file transfer should overwrite a file if that file already exists
stanzaType             - String      - Either IQ or message,  Currently only iq is supported
maxSessions            - integer     - The max number of send/receive sessions that may run concurrently
transferTimeout        - integer     - How long should a stream session wait between messages
maxBlockSize           - integer     - Largest block size that a stream session should accept (limited by xmpp server)
prefBlockSize          - integer     - The preferred block size for file transfer
acceptTransferCallback - function ptr- This should be a function pointer that will return a boolean value letting the caller know if a 
                                       file transfer should or should not be accepted.  If this option is provided the maxSessions option is ignored.
fileNameCallback       - function ptr- This should be a function pointer that will return a string with the full path and name a file should be saved as.  
                                       If the provided function pointer returns None or is not provided the default saveDirectory + saveNamePrefix_sid will be used.

There are also 2 events that users of this plugin can register to receive notifications:
FILE_FINISHED_SENDING     - This event is fired after a file send has completed
FILE_FINISHED_RECEIVING   - This event is fired after an incoming file transfer has completed.

[fritzy]

This looks nice, but I'm going to hold off till 1.1 for a merge in on this. It also needs some native stanzas.

[macdiesel]

Some native stanza's have been added. Also the code has been updated so it works with 1.0 beta 2. commit tag can be found here: https://github.com/macdiesel/SleekXMPP/commit/739e1925e6b27aaa4a58f014c5d92a2be33c90b7