Default POST servlet reports invalid operation when it should report 404
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                 Key: SLING-2236
                 URL: https://issues.apache.org/jira/browse/SLING-2236
             Project: Sling
          Issue Type: Bug
          Components: Servlets
            Reporter: Jeff Young


In sling/servlets/post/impl/SlingPostServlet.java's doPost() method, we look up 
the operation (and report an unknown operation) before checking privileges.  
I'd 
like to propose that when the operation is not understood, we first check for 
read access to the resource, and if unsuccessful, report that instead of 
reporting
"invalid operation".

Here's the issue: say I define my own POST servlet which supports 
:operation="foo".  I set a sling:resourceType so that my POST servlet gets 
invoked.  All fine 
and good.

Now someone without read access to the resource tries to do an 
:operation="foo".  Sling can't read the sling:resourceType (no read access), 
and so invokes the
default POST servlet instead of my custom POST servlet.  It looks up 
:operation="foo" and reports "invalid operation" (which is pretty misleading).

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