[dev] Using Preauthenticate Hook to Mangle Username

[Brandon W. Uhlman]

Hi, all.

I'm trying to use the _horde_hook_preauthenticate to rewrite usernames  
at login time based on the domain at which they're visiting Horde. To  
clarify, an example.

webmail.foo.bar.com and webmail.quux.bar.com both point at the same  
Horde/IMP install. User 'bob' visits both addresses, and logs into  
both. Bill gets authenticated as foo.bill or quux.bill depending on  
which URI I use.

I think that _horde_hook_preauthenticate is the right tool to use.  
Currently, I have

         function _horde_hook_preauthenticate($userId, $credential, $realm)
         {
                 if($_SERVER['HTTP_HOST'] == "webmail.foo.bar.com")
                         $userId = "foo." . $userId;
                 else
                         $userId = "quux." . $userId;

                 $_SESSION['imp']['user'] = $userId;
                 // $_SESSION['imp']['uniquser'] = $userId;

                 return true;
         }

in the hooks.php file, and I have $conf['hooks']['preauthenticate']  
(or whatever it's actually called) set to true in  
~/horde/config/conf.php. I am able to authenticate successfully now,  
but Horde doesn't bother using the prefix for other things, like  
loading prefs from horde_prefs.

I think this is because it's trying to use  
$_SESSION['imp']['uniquser'] to access the prefs container, and  
uniquser doesn't get rewritten. If I try to rewrite uniquser in the  
hook, I get thrown into an infinite loop where it loads an infinite  
number of Horde menu bars along the left hand side of my screen.

Is my code in _preauthenticate buggy, or am I missing a piece of the  
puzzle here? Should I clean up uniquser using postauthenticate maybe?

If I can get this working using just preauthenticate, maybe it should  
be included in hooks.php.dist, because the only example for  
preauthenticate right now is a pretty trivial one that doesn't  
actually use any variables or show how to set them.

I'm using Horde 3.1.3 and Imp 4.1.3.

Thanks,

Brandon

Brandon W. Uhlman
Burnaby, BC

E-mail: brandon at branflakes.net