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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal>I wasn’t sure if this should be posted to shib-dev, but here it goes:<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I am working on implementing a use case with idp v3.1.1 where I need to obtain a user attribute post authentication and compare it with a predefined value/pattern. If a match is allowed, the flow can proceed. Otherwise, flow would be cancelled and an error message sent back to the SP. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I think the c14n flow that kick in after authentication, and particularly the one that is attribute based would be useful here. I think I can do the following: Configure the existing AttributeSourcedSubjectCanonicalization to locate the flow based on that attribute value and create the corresponding flow def/beans. If the attribute source didn’t produce the value I wanted, the exception is handled and its translation put into the response. The flow that I write for the attribute would be identical to the simple flow, or I could just directly call that flow. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Would that be doable? It does feel strange because no canonicalization is in fact taking place. The alternative would be to write extensions. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Also what I am not clear on is the canonicalization flow selection strategy. I can see that each strategy tried to figure if it’s applicable but I am not sure in what order these strategies are defined. If I enable attribute-based canonicalization, is there some sort of ranking I need to define to make sure it kicks in before the simple flow? <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Misagh<o:p></o:p></p></div></body></html>