only allow a whitelist of email domains for the site

plugins/DomainWhitelist/DomainWhitelistPlugin.php

@@ -0,0 +1,110 @@
+<?php
+/**
+ * StatusNet - the distributed open-source microblogging tool
+ * Copyright (C) 2011, StatusNet, Inc.
+ *
+ * Restrict the email addresses in a domain to a select whitelist
+ * 
+ * PHP version 5
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * @category  Cache
+ * @package   StatusNet
+ * @author    Evan Prodromou <evan@status.net>
+ * @copyright 2011 StatusNet, Inc.
+ * @license   http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
+ * @link      http://status.net/
+ */
+
+if (!defined('STATUSNET')) {
+    // This check helps protect against security problems;
+    // your code file can't be executed directly from the web.
+    exit(1);
+}
+
+/**
+ * Restrict the email addresses to a domain whitelist
+ *
+ * @category  General
+ * @package   StatusNet
+ * @author    Evan Prodromou <evan@status.net>
+ * @copyright 2011 StatusNet, Inc.
+ * @license   http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
+ * @link      http://status.net/
+ */
+
+class DomainWhitelistPlugin extends Plugin
+{
+    function onRequireValidatedEmailPlugin_Override($user, &$knownGood)
+    {
+        $knownGood = (!empty($user->email) && $this->matchesWhitelist($user->email));
+        return true;
+    }
+
+    function onStartAddEmailAddress($user, $email)
+    {
+        if (!$this->matchesWhitelist($email)) {
+            throw new Exception(_('That email address is not allowed on this site.'));
+        }
+
+        return true;
+    }
+
+    function onEndValidateEmailInvite($user, $email, &$valid)
+    {
+        if ($valid) {
+            $valid = $this->matchesWhitelist($email);
+        }
+
+        return true;
+    }
+
+    function matchesWhitelist($email)
+    {
+        $whitelist = $this->getWhitelist();
+
+        if (empty($whitelist)) {
+            return true;
+        }
+
+        $parts = explode('@', $email);
+
+        $userDomain = strtolower($parts[1]);
+
+        return in_array($userDomain, $whitelist);
+    }
+
+    function getWhitelist()
+    {
+        $whitelist = common_config('email', 'whitelist');
+        
+        if (is_array($whitelist)) {
+            return $whitelist;
+        } else {
+            return explode('|', $whitelist);
+        }
+    }
+
+    function onPluginVersion(&$versions)
+    {
+        $versions[] = array('name' => 'DomainWhitelist',
+                            'version' => STATUSNET_VERSION,
+                            'author' => 'Evan Prodromou',
+                            'homepage' => 'http://status.net/wiki/Plugin:DomainWhitelist',
+                            'rawdescription' =>
+                            _m('Restrict domains for email users'));
+        return true;
+    }
+}