The first problem is finding a suitable project to start with. The openfire server is very nice, but it’s GPL. See my previous post for more whining on this issue.
The next problem is clustering the XMPP server itself. If we embed the server as a spring bean, we’ll have multiple instances running in our cluster, and these instances will need to coordinate among themselves. Some servers have this capability built in, but with such limited choices already due to licensing, the clustering feature may shrink the number to zero.
Also, the XMPP protocol requires that users log in when connecting to a server. This is fine for external applications wishing to communicate with a sakai-hosted XMPP server, but it’s problematic for internal use because we (rightly!) have no access to a user’s password at runtime. One solution to this could be to pass the session ID as the password, and have the XMPP server’s directory service implementation check to see whether a sakai session with that ID is currently active for that user. It’s a hack, but at least it’s a place to start.
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