Modify Username on Input?

[Dylan Martin]

Hi all.

I'm working on setting up an IDP for a small college.  I want to accept
usernames in two forms:  'bob.user' & 'bob.user at mycollege.edu'.  I just
want to knock the '@mycollege.edu' off the end if the user submits it that
way.  Should be easier than writing this email.

Unfortunately, my java isn't great.  I still don't really know what a bean
is.  I don't know the right way to go about doing this.  Is there a
property file I should edit?  An XML file?  I noticed the source for Shib
is broken up into many pieces, so which piece would I want?

Just to be extra clear, I'm talking about the stage in the process where
the user enters a username and password into the web form and the idp gets
the form data.  So, the form collection and interpretation stage, whatever
that is.  Unless, of course, that's a bad idea and you would suggest doing
it at a different stage.

I need it to happen before authentication, because authentication will fail
if I don't get the username massaged properly.

And no, I'm not going to just tell my users to learn to type.  This is a
computer, it should compute things.  Pulling a known substring off the end
of a string is easy for a computer and hard for 10,000 random humans.

Thanks!
-Dylan
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