[GitHub] [directory-server] alesuiss edited a comment on issue #23: DIRSERVER-1844 adding automatic memberOf attributes

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alesuiss edited a comment on issue #23: DIRSERVER-1844 adding automatic memberOf attributes
URL: https://github.com/apache/directory-server/pull/23#issuecomment-537431674
 
 
   Hello all,
   
   I need this functionality too, so I've had a look yesterday. I've managed to advance quite a bit but I got stuck, so I'd like to ask for some input. Attached below is my current code (I can clean it up and do a proper PR once it works).
   
   TL;DR: how do you use an ExprNode in an EntryFilter?
   
   What currently works:
   - lookup works and adds the memberOf attributes
   - search also adds the memberOf attributes
   
   What doesn't:
   - search can't search on memberOf (necessary for most use cases)
   
   My approach in search is that I first remove any part of the filter ExprNode that checks memberOf (otherwise it returns empty since the attribute isn't set on entries):
   ```
           ExprNode filter = searchContext.getFilter() ;
           ExprNode newfilter = (ExprNode) filter.clone().accept(new RemoveMemberOfFilterVisitor()) ;
           if(newfilter == null)
               newfilter = ObjectClassNode.OBJECT_CLASS_NODE ;
           searchContext.setFilter(newfilter);
   ```
   
   Then I call next, and on the resulting cursor I add a filter that adds the memberOf attributes.
   
   Finally, I should apply the original ExprNode filter on the modified entry that now has memberOf. But I can't for the life of me figure out how to do that.
   
   Any help would be most welcome :-)
   
   Thanks,
   Arthur
   
   [MemberOfInterceptor.txt](https://github.com/apache/directory-server/files/3680570/MemberOfInterceptor.txt)
   

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