[okfn-discuss] CKAN getting spammed again

[Rufus Pollock]

CKAN is getting more 'backhanded compliments' in the form of spamming:

   http://www.ckan.net/revision/
   http://www.ckan.net/revision/read/1978

Admins can keep purging this by hand [1] but this isn't hugely 
efficient. In fact around christmas to deal with a bad repeated attack I 
implemented some more sophisticated support ([2],[3]) including 
blacklisting but didn't fully integrate this into controllers. Before we 
go ahead and do more I wonder if anyone else has comments as to how best 
to deal with spam on 'world-editable' systems. In particular what are 
people's views on the effectiveness (and cost of implementation) of 
things like:

   * captchas (and texchas)
   * ip blacklisting
   * bayesian spam filtering of some kind

~rufus	

[1]:<http://lists.okfn.org/pipermail/okfn-help/2007-October/000038.html>
[2]:<http://knowledgeforge.net/ckan/trac/changeset/205>
[3]:<http://knowledgeforge.net/ckan/trac/changeset/202>