gnu-social/plugins/SubscriptionThrottle/SubscriptionThrottlePlugin.php

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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) {
// TRANS: Exception thrown when subscribing too quickly.
throw new Exception(_m('Too many subscriptions. Take a break and try again later.'));
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}
}
}
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) {
// TRANS: Exception thrown when joing groups too quickly.
throw new Exception(_m('Too many memberships. Take a break and try again later.'));
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}
}
}
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' =>
// TRANS: Plugin description.
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_m('Configurable limits for subscriptions and group memberships.'));
return true;
}
}