lightopenID for university Google-hosted email

Question

I am currently experimenting with implementing an openID for a small website for college. I am very new to this and have followed up with related articles. I have downloaded lightopenId and uploaded the folder to my webserver. My school has google hosting their email service so typical email addresses are: like this studentlastname@myuniversity.edu. We can login through mail.google.com or a custom web page designed by google specifically for our login mail.google.com/a/oakland.edu/.

Instead of having users be redirected to the general $openid->identity = 'https://www.google.com/accounts/o8/id'; can I have the users directed to the custom university google hosted page to authenticate?

Gives me error:

No OpenID Server found at http://mail.google.com/a/oakland.edu/accounts/o8/id

openid.php:

<? 
    <?php
    require 'openid.php';
    try {
        # Change 'localhost' to your domain name.
        $openid = new LightOpenID('http://webprolearner.ueuo.com');
        if(!$openid->mode) {
            if(isset($_GET['login'])) {
                $openid->identity = 'mail.google.com/a/oakland.edu/accounts/o8/id';
                header('Location: ' . $openid->authUrl());
            }
    ?>
    <form action="?login" method="post">
        <button>Login with Google</button>
    </form>
    <?php
        } elseif($openid->mode == 'cancel') {
            echo 'User has canceled authentication!';
        } else {
            echo 'User ' . ($openid->validate() ? $openid->identity . ' has ' : 'has not ') . 'logged in.';
        }
    } catch(ErrorException $e) {
        echo $e->getMessage();
    }

Answer 1

As far as I know, the correct identity in your case would be:

https://www.google.com/accounts/o8/site-xrds?hd=oakland.edu

This url returns a valid XRDS (so LightOpenID will find a server).

Note that if the server isn't configured properly, you might get a similar error when calling validate().