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+<?php
+/**
+ * StatusNet - the distributed open-source microblogging tool
+ * Copyright (C) 2010, StatusNet, Inc.
+ *
+ * Plugin to throttle subscriptions by a user
+ *
+ * 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 Throttle
+ * @package StatusNet
+ * @author Evan Prodromou <evan@status.net>
+ * @copyright 2010 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);
+}
+
+/**
+ * Subscription throttle
+ *
+ * @category Throttle
+ * @package StatusNet
+ * @author Evan Prodromou <evan@status.net>
+ * @copyright 2010 StatusNet, Inc.
+ * @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
+ * @link http://status.net/
+ */
+
+class SubscriptionThrottlePlugin extends Plugin
+{
+ public $subLimits = array(86400 => 100,
+ 3600 => 50);
+
+ public $groupLimits = array(86400 => 50,
+ 3600 => 25);
+
+ /**
+ * Filter subscriptions to see if they're coming too fast.
+ *
+ * @param User $user The user subscribing
+ * @param User $other The user being subscribed to
+ *
+ * @return boolean hook value
+ */
+
+ function onStartSubscribe($user, $other)
+ {
+ foreach ($this->subLimits as $seconds => $limit) {
+ $sub = $this->_getNthSub($user, $limit);
+
+ if (!empty($sub)) {
+ $subtime = strtotime($sub->created);
+ $now = time();
+ if ($now - $subtime < $seconds) {
+ throw new Exception(_("Too many subscriptions. Take a break and try again later."));
+ }
+ }
+ }
+
+ return true;
+ }
+
+ /**
+ * Filter group joins to see if they're coming too fast.
+ *
+ * @param Group $group The group being joined
+ * @param User $user The user joining
+ *
+ * @return boolean hook value
+ */
+
+ function onStartJoinGroup($group, $user)
+ {
+ foreach ($this->groupLimits as $seconds => $limit) {
+ $mem = $this->_getNthMem($user, $limit);
+ if (!empty($mem)) {
+
+ $jointime = strtotime($mem->created);
+ $now = time();
+ if ($now - $jointime < $seconds) {
+ throw new Exception(_("Too many memberships. Take a break and try again later."));
+ }
+ }
+ }
+
+ return true;
+ }
+
+ /**
+ * Get the Nth most recent subscription for this user
+ *
+ * @param User $user The user to get subscriptions for
+ * @param integer $n How far to count back
+ *
+ * @return Subscription a subscription or null
+ */
+
+ private function _getNthSub($user, $n)
+ {
+ $sub = new Subscription();
+
+ $sub->subscriber = $user->id;
+ $sub->orderBy('created DESC');
+ $sub->limit($n - 1, 1);
+
+ if ($sub->find(true)) {
+ return $sub;
+ } else {
+ return null;
+ }
+ }
+
+ /**
+ * Get the Nth most recent group membership for this user
+ *
+ * @param User $user The user to get memberships for
+ * @param integer $n How far to count back
+ *
+ * @return Group_member a membership or null
+ */
+
+ private function _getNthMem($user, $n)
+ {
+ $mem = new Group_member();
+
+ $mem->profile_id = $user->id;
+ $mem->orderBy('created DESC');
+ $mem->limit($n - 1, 1);
+
+ if ($mem->find(true)) {
+ return $mem;
+ } else {
+ return null;
+ }
+ }
+
+ /**
+ * Return plugin version data for display
+ *
+ * @param array &$versions Array of version arrays
+ *
+ * @return boolean hook value
+ */
+
+ function onPluginVersion(&$versions)
+ {
+ $versions[] = array('name' => 'SubscriptionThrottle',
+ 'version' => STATUSNET_VERSION,
+ 'author' => 'Evan Prodromou',
+ 'homepage' => 'http://status.net/wiki/Plugin:SubscriptionThrottle',
+ 'rawdescription' =>
+ _m('Configurable limits for subscriptions and group memberships.'));
+ return true;
+ }
+}
+