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queryWrite("DELETE FROM {$table} WHERE eMin < FLOOR((UNIX_TIMESTAMP() - 60) / 60)"); } public static function globalRateLimit() { static $_cachedGlobal = null; if ($_cachedGlobal === null) { $_cachedGlobal = new wfRateLimit(self::TYPE_GLOBAL); } return $_cachedGlobal; } public static function crawlerViewsRateLimit() { static $_cachedCrawlerViews = null; if ($_cachedCrawlerViews === null) { $_cachedCrawlerViews = new wfRateLimit(self::TYPE_CRAWLER_VIEWS); } return $_cachedCrawlerViews; } public static function crawler404sRateLimit() { static $_cachedCrawler404s = null; if ($_cachedCrawler404s === null) { $_cachedCrawler404s = new wfRateLimit(self::TYPE_CRAWLER_404S); } return $_cachedCrawler404s; } public static function humanViewsRateLimit() { static $_cachedHumanViews = null; if ($_cachedHumanViews === null) { $_cachedHumanViews = new wfRateLimit(self::TYPE_HUMAN_VIEWS); } return $_cachedHumanViews; } public static function human404sRateLimit() { static $_cachedHuman404s = null; if ($_cachedHuman404s === null) { $_cachedHuman404s = new wfRateLimit(self::TYPE_HUMAN_404S); } return $_cachedHuman404s; } /** * Returns whether or not humans and bots have the same rate limits configured. * * @return bool */ public static function identicalHumanBotRateLimits() { $humanViews = self::humanViewsRateLimit(); $crawlerViews = self::crawlerViewsRateLimit(); if ($humanViews->isEnabled() != $crawlerViews->isEnabled()) { return false; } if ($humanViews->limit() != $crawlerViews->limit()) { return false; } $human404s = self::human404sRateLimit(); $crawler404s = self::crawler404sRateLimit(); if ($human404s->isEnabled() != $crawler404s->isEnabled()) { return false; } if ($human404s->limit() != $crawler404s->limit()) { return false; } return true; } public static function mightRateLimit($hitType) { if (!wfConfig::get('firewallEnabled')) { return false; } $IP = wfUtils::getIP(); if (wfBlock::isWhitelisted($IP)) { return false; } if (wfConfig::get('neverBlockBG') == 'neverBlockUA' && wfCrawl::isGoogleCrawler()) { return false; } if (wfConfig::get('neverBlockBG') == 'neverBlockVerified' && wfCrawl::isVerifiedGoogleCrawler()) { return false; } if ($hitType == '404') { $allowed404s = wfConfig::get('allowed404s'); if (is_string($allowed404s)) { $allowed404s = array_filter(preg_split("/[\r\n]+/", $allowed404s)); $allowed404sPattern = ''; foreach ($allowed404s as $allowed404) { $allowed404sPattern .= preg_replace('/\\\\\*/', '.*?', preg_quote($allowed404, '/')) . '|'; } $uri = $_SERVER['REQUEST_URI']; if (($index = strpos($uri, '?')) !== false) { $uri = substr($uri, 0, $index); } if ($allowed404sPattern && preg_match('/^' . substr($allowed404sPattern, 0, -1) . '$/i', $uri)) { return false; } } } if (self::globalRateLimit()->isEnabled()) { return true; } $visitorType = self::visitorType(); if ($visitorType == self::VISITOR_TYPE_CRAWLER) { if ($hitType == self::HIT_TYPE_NORMAL) { if (self::crawlerViewsRateLimit()->isEnabled()) { return true; } } else { if (self::crawler404sRateLimit()->isEnabled()) { return true; } } } else { if ($hitType == self::HIT_TYPE_NORMAL) { if (self::humanViewsRateLimit()->isEnabled()) { return true; } } else { if (self::human404sRateLimit()->isEnabled()) { return true; } } } return false; } public static function countHit($hitType, $ip) { $table = self::table(); $ipHex = wfDB::binaryValueToSQLHex(wfUtils::inet_pton($ip)); wfDB::shared()->queryWrite("INSERT INTO {$table} (eMin, IP, hitType, hits) VALUES (FLOOR(UNIX_TIMESTAMP() / 60), {$ipHex}, %s, @wfcurrenthits := 1) ON DUPLICATE KEY UPDATE hits = IF(@wfcurrenthits := hits + 1, hits + 1, hits + 1)", $hitType); } /** * Returns one of the VISITOR_TYPE_ constants for the purposes of determining which rate limit to apply. * * @return string */ public static function visitorType() { static $_cachedVisitorType = null; if ($_cachedVisitorType === null) { $_cachedVisitorType = ((isset($_SERVER['HTTP_USER_AGENT']) && wfCrawl::isCrawler($_SERVER['HTTP_USER_AGENT'])) || empty($_SERVER['HTTP_USER_AGENT']) ? wfRateLimit::VISITOR_TYPE_CRAWLER : wfRateLimit::VISITOR_TYPE_HUMAN); } return $_cachedVisitorType; } protected function __construct($type) { $this->_type = $type; } /** * Returns whether or not this rate limit is configured in a way where it would run. * * @return bool */ public function isEnabled() { switch ($this->_type) { case self::TYPE_GLOBAL: return wfConfig::get('maxGlobalRequests') != 'DISABLED' && wfConfig::getInt('maxGlobalRequests') > 0; case self::TYPE_CRAWLER_VIEWS: return wfConfig::get('maxRequestsCrawlers') != 'DISABLED' && wfConfig::getInt('maxRequestsCrawlers') > 0; case self::TYPE_CRAWLER_404S: return wfConfig::get('max404Crawlers') != 'DISABLED' && wfConfig::getInt('max404Crawlers') > 0; case self::TYPE_HUMAN_VIEWS: return wfConfig::get('maxRequestsHumans') != 'DISABLED' && wfConfig::getInt('maxRequestsHumans') > 0; case self::TYPE_HUMAN_404S: return wfConfig::get('max404Humans') != 'DISABLED' && wfConfig::getInt('max404Humans') > 0; } return true; } public function limit() { switch ($this->_type) { case self::TYPE_GLOBAL: return wfConfig::getInt('maxGlobalRequests'); case self::TYPE_CRAWLER_VIEWS: return wfConfig::getInt('maxRequestsCrawlers'); case self::TYPE_CRAWLER_404S: return wfConfig::getInt('max404Crawlers'); case self::TYPE_HUMAN_VIEWS: return wfConfig::getInt('maxRequestsHumans'); case self::TYPE_HUMAN_404S: return wfConfig::getInt('max404Humans'); } return -1; } public function shouldEnforce($hitType) { switch ($this->_type) { case self::TYPE_GLOBAL: return $this->isEnabled() && $this->_hitCount() > max(wfConfig::getInt('maxGlobalRequests'), 1); case self::TYPE_CRAWLER_VIEWS: return self::visitorType() == self::VISITOR_TYPE_CRAWLER && $hitType == self::HIT_TYPE_NORMAL && $this->isEnabled() && $this->_hitCount() > wfConfig::getInt('maxRequestsCrawlers'); case self::TYPE_CRAWLER_404S: return self::visitorType() == self::VISITOR_TYPE_CRAWLER && $hitType == self::HIT_TYPE_404 && $this->isEnabled() && $this->_hitCount() > wfConfig::getInt('max404Crawlers'); case self::TYPE_HUMAN_VIEWS: return self::visitorType() == self::VISITOR_TYPE_HUMAN && $hitType == self::HIT_TYPE_NORMAL && $this->isEnabled() && $this->_hitCount() > wfConfig::getInt('maxRequestsHumans'); case self::TYPE_HUMAN_404S: return self::visitorType() == self::VISITOR_TYPE_HUMAN && $hitType == self::HIT_TYPE_404 && $this->isEnabled() && $this->_hitCount() > wfConfig::getInt('max404Humans'); } return false; } /** * Returns the hit count corresponding to the current request type. * * @return int */ protected function _hitCount() { if (self::$_hitCount === false) { self::$_hitCount = (int) wfDB::shared()->querySingle("SELECT @wfcurrenthits"); } return self::$_hitCount; } }