[Pidgin] #12385: Bonjour should not allow spaces in user name

[Pidgin]

#12385: Bonjour should not allow spaces in user name
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 Reporter:  cweiske  |     Owner:  datallah
     Type:  defect   |    Status:  new     
Component:  Bonjour  |   Version:  2.7.2   
 Keywords:           |  
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 The bonjour protocol plugin allows spaces in the user name. The user name
 is used in combination with the host setting to generate a jabber ID
 (jid).

 Jabber IDs may not have a space in the node (pre- at -part) section:
 The XMPP specification in RFC 3920, section A5 forbids the use of
 STRINGPREP (RFC 3454) table C.1.1, which contains the space.

 There should be some input validation for username and host in the bonjour
 plugin.

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Ticket URL: <http://developer.pidgin.im/ticket/12385>
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