move redirect-to-openid code to OpenID plugin

plugins/OpenID/OpenIDPlugin.php

@@ -156,4 +156,19 @@ class OpenIDPlugin extends Plugin
         $action->element('meta', array('http-equiv' => 'X-XRDS-Location',
                                        'content' => common_local_url('publicxrds')));
     }
+
+    /**
+     * Redirect to OpenID login if they have an OpenID
+     *
+     * @return boolean whether to continue
+     */
+
+    function onRedirectToLogin($action, $user)
+    {
+        if (!empty($user) && User_openid::hasOpenID($user->id)) {
+            common_redirect(common_local_url('openidlogin'), 303);
+            return false;
+        }
+        return true;
+    }
 }

plugins/OpenID/User_openid.php

@@ -4,7 +4,7 @@
  */
 require_once INSTALLDIR.'/classes/Memcached_DataObject.php';
 
-class User_openid extends Memcached_DataObject 
+class User_openid extends Memcached_DataObject
 {
     ###START_AUTOCODE
     /* the code below is auto generated do not remove the above tag */
@@ -22,4 +22,15 @@ class User_openid extends Memcached_DataObject
 
     /* the code above is auto generated do not remove the tag below */
     ###END_AUTOCODE
+
+    static function hasOpenID($user_id)
+    {
+        $oid = new User_openid();
+
+        $oid->user_id = $user_id;
+
+        $cnt = $oid->find();
+
+        return ($cnt > 0);
+    }
 }