gnu-social/plugins/RegisterThrottle/RegisterThrottlePlugin.php

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<?php
/**
* StatusNet - the distributed open-source microblogging tool
* Copyright (C) 2010, StatusNet, Inc.
*
* Throttle registration by IP address
*
* 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 Spam
* @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')) {
exit(1);
}
/**
* Throttle registration by IP address
*
* We a) record IP address of registrants and b) throttle registrations.
*
* @category Spam
* @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 RegisterThrottlePlugin extends Plugin
{
/**
* Array of time spans in seconds to limits.
*
* Default is 3 registrations per hour, 5 per day, 10 per week.
*/
public $regLimits = array(604800 => 10, // per week
86400 => 5, // per day
3600 => 3); // per hour
/**
* Disallow registration if a silenced user has registered from
* this IP address.
*/
public $silenced = true;
/**
* Whether we're enabled; prevents recursion.
*/
static private $enabled = true;
/**
* Database schema setup
*
* We store user registrations in a table registration_ip.
*
* @return boolean hook value; true means continue processing, false means stop.
*/
function onCheckSchema()
{
$schema = Schema::get();
// For storing user-submitted flags on profiles
$schema->ensureTable('registration_ip', Registration_ip::schemaDef());
return true;
}
/**
* Called when someone tries to register.
*
* We check the IP here to determine if it goes over any of our
* configured limits.
*
* @param Action $action Action that is being executed
*
* @return boolean hook value
*/
function onStartRegistrationTry($action)
{
$ipaddress = $this->_getIpAddress();
if (empty($ipaddress)) {
// TRANS: Server exception thrown when no IP address can be found for a registation attempt.
throw new ServerException(_m('Cannot find IP address.'));
}
foreach ($this->regLimits as $seconds => $limit) {
$this->debug("Checking $seconds ($limit)");
$reg = $this->_getNthReg($ipaddress, $limit);
if (!empty($reg)) {
$this->debug("Got a {$limit}th registration.");
$regtime = strtotime($reg->created);
$now = time();
$this->debug("Comparing {$regtime} to {$now}");
if ($now - $regtime < $seconds) {
// TRANS: Exception thrown when too many user have registered from one IP address within a given time frame.
throw new Exception(_m('Too many registrations. Take a break and try again later.'));
}
}
}
// Check for silenced users
if ($this->silenced) {
$ids = Registration_ip::usersByIP($ipaddress);
foreach ($ids as $id) {
$profile = Profile::getKV('id', $id);
if ($profile && $profile->isSilenced()) {
// TRANS: Exception thrown when attempting to register from an IP address from which silenced users have registered.
throw new Exception(_m('A banned user has registered from this address.'));
}
}
}
return true;
}
/**
* Called after someone registers, by any means.
*
* We record the successful registration and IP address.
*
* @param Profile $profile new user's profile
*
* @return boolean hook value
*/
public function onEndUserRegister(Profile $profile)
{
$ipaddress = $this->_getIpAddress();
if (empty($ipaddress)) {
// User registration can happen from command-line scripts etc.
return true;
}
$reg = new Registration_ip();
$reg->user_id = $profile->id;
$reg->ipaddress = $ipaddress;
$result = $reg->insert();
if (!$result) {
common_log_db_error($reg, 'INSERT', __FILE__);
// @todo throw an exception?
}
return true;
}
/**
* Check the version of the plugin.
*
* @param array &$versions Version array.
*
* @return boolean hook value
*/
function onPluginVersion(&$versions)
{
$versions[] = array('name' => 'RegisterThrottle',
'version' => GNUSOCIAL_VERSION,
'author' => 'Evan Prodromou',
'homepage' => 'http://status.net/wiki/Plugin:RegisterThrottle',
'description' =>
// TRANS: Plugin description.
2010-09-18 10:52:35 +01:00
_m('Throttles excessive registration from a single IP address.'));
return true;
}
/**
* Gets the current IP address.
*
* @return string IP address or null if not found.
*/
private function _getIpAddress()
{
$keys = array('HTTP_X_FORWARDED_FOR',
'HTTP_X_CLIENT',
'CLIENT-IP',
'REMOTE_ADDR');
foreach ($keys as $k) {
if (!empty($_SERVER[$k])) {
return $_SERVER[$k];
}
}
return null;
}
/**
* Gets the Nth registration with the given IP address.
*
* @param string $ipaddress Address to key on
* @param integer $n Nth address
*
* @return Registration_ip nth registration or null if not found.
*/
private function _getNthReg($ipaddress, $n)
{
$reg = new Registration_ip();
$reg->ipaddress = $ipaddress;
$reg->orderBy('created DESC');
$reg->limit($n - 1, 1);
if ($reg->find(true)) {
return $reg;
} else {
return null;
}
}
/**
* When silencing a user, silence all other users registered from that IP
* address.
*
* @param Profile $profile Person getting a new role
* @param string $role Role being assigned like 'moderator' or 'silenced'
*
* @return boolean hook value
*/
function onEndGrantRole($profile, $role)
{
if (!self::$enabled) {
return true;
}
if ($role != Profile_role::SILENCED) {
return true;
}
if (!$this->silenced) {
return true;
}
$ri = Registration_ip::getKV('user_id', $profile->id);
if (empty($ri)) {
return true;
}
$ids = Registration_ip::usersByIP($ri->ipaddress);
foreach ($ids as $id) {
if ($id == $profile->id) {
continue;
}
$other = Profile::getKV('id', $id);
if (empty($other)) {
continue;
}
if ($other->isSilenced()) {
continue;
}
$old = self::$enabled;
self::$enabled = false;
$other->silence();
self::$enabled = $old;
}
}
}