How to retrieve SP required attributes at the IDP before authentication

[Dierick Bart]

No; in my loginhandler I just need to know wich attributes the Service Provider needs. What I'm going to do is: 

1) the Service Provider forwards to the IDP 
2) the IDP chooses my loginhandler 
3) my loginhandler creates and shows a servlet. That servlet ask for authentication AND it shows which attributes the Service Provider needs 
4) the user authenticates AND provide the attributes 
5) the authentication is completed, the attributes are PUSHED to the Service Provider. 


So the loginhandler needs the info about the required attributes so that the user can provide these attributes. 

So you suggest and says that this (is only) possible with the metadata? 

Greetings
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