gnu-social/plugins/SubscriptionThrottle/SubscriptionThrottlePlugin.php

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<?php
// This file is part of GNU social - https://www.gnu.org/software/social
//
// GNU social 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.
//
// GNU social 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 GNU social. If not, see <http://www.gnu.org/licenses/>.
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/**
* Plugin to throttle subscriptions by a user
*
* @category Throttle
* @package GNUsocial
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* @author Evan Prodromou <evan@status.net>
* @copyright 2010 StatusNet, Inc.
* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
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*/
defined('GNUSOCIAL') || die();
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/**
* Subscription throttle
*
* @category Throttle
* @package GNUsocial
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* @author Evan Prodromou <evan@status.net>
* @copyright 2010 StatusNet, Inc.
* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
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*/
class SubscriptionThrottlePlugin extends Plugin
{
const PLUGIN_VERSION = '2.0.0';
public $subLimits = [86400 => 100, 3600 => 50];
public $groupLimits = [86400 => 50, 3600 => 25];
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/**
* Filter subscriptions to see if they're coming too fast.
*
* @param Profile $profile The profile subscribing
* @param Profile $other The profile being subscribed to
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*
* @return boolean hook value
*/
public function onStartSubscribe(Profile $profile, $other)
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{
foreach ($this->subLimits as $seconds => $limit) {
$sub = $this->_getNthSub($profile, $limit);
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if (!empty($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.
*
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* @param Group $group The group being joined
* @param Profile $profile The profile joining
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*
* @return boolean hook value
*/
public function onStartJoinGroup($group, $profile)
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{
foreach ($this->groupLimits as $seconds => $limit) {
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$mem = $this->_getNthMem($profile, $limit);
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if (!empty($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 profile
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*
* @param Profile $profile profile to get subscriptions for
* @param integer $n How far to count back
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*
* @return Subscription a subscription or null
*/
private function _getNthSub(Profile $profile, $n)
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{
$sub = new Subscription();
$sub->subscriber = $profile->id;
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$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 profile
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*
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* @param Profile $profile The user to get memberships for
* @param integer $n How far to count back
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*
* @return Group_member a membership or null
*/
private function _getNthMem(Profile $profile, $n)
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{
$mem = new Group_member();
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$mem->profile_id = $profile->id;
$mem->orderBy('created DESC, group_id DESC');
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$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
*/
public function onPluginVersion(array &$versions): bool
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{
$versions[] = array('name' => 'SubscriptionThrottle',
'version' => self::PLUGIN_VERSION,
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'author' => 'Evan Prodromou',
'homepage' => GNUSOCIAL_ENGINE_REPO_URL . 'tree/master/plugins/SubscriptionThrottle',
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'rawdescription' =>
// TRANS: Plugin description.
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_m('Configurable limits for subscriptions and group memberships.'));
return true;
}
}