<?php

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class wfCache {

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private static $cacheStats = array();

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private static $cacheClearedThisRequest = false;

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private static $lastRecursiveDeleteError = false;

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public static function removeCaching() {

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$cacheType = wfConfig::get('cacheType', false);

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if ($cacheType === 'disabled') {

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return;

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}

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if ($cacheType == 'falcon') {

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self::addHtaccessCode('remove');

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self::updateBlockedIPs('remove');

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}

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wfConfig::set('cacheType', 'disabled');

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$cacheDir = WP_CONTENT_DIR . '/wfcache/';

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if (file_exists($cacheDir . '.htaccess')) {

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unlink($cacheDir . '.htaccess');

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}

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self::clearPageCacheSafe();

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}

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public static function clearPageCacheSafe(){

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if(self::$cacheClearedThisRequest){ return; }

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self::$cacheClearedThisRequest = true;

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self::clearPageCache();

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}

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public static function clearPageCache(){ //If a clear is in progress this does nothing.

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self::$cacheStats = array(

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'dirsDeleted' => 0,

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'filesDeleted' => 0,

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'totalData' => 0,

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'totalErrors' => 0,

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'error' => '',

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);

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$cacheDir = WP_CONTENT_DIR . '/wfcache/';

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if (!file_exists($cacheDir)) {

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return self::$cacheStats;

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}

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$cacheClearLock = WP_CONTENT_DIR . '/wfcache/clear.lock';

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if(! is_file($cacheClearLock)){

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if(! touch($cacheClearLock)){

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self::$cacheStats['error'] = "Could not create a lock file $cacheClearLock to clear the cache.";

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self::$cacheStats['totalErrors']++;

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return self::$cacheStats;

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}

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}

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$fp = fopen($cacheClearLock, 'w');

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if(! $fp){

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self::$cacheStats['error'] = "Could not open the lock file $cacheClearLock to clear the cache. Please make sure the directory is writable by your web server.";

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self::$cacheStats['totalErrors']++;

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return self::$cacheStats;

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}

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if(flock($fp, LOCK_EX | LOCK_NB)){ //non blocking exclusive flock attempt. If we get a lock then it continues and returns true. If we don't lock, then return false, don't block and don't clear the cache.

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// This logic means that if a cache clear is currently in progress we don't try to clear the cache.

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// This prevents web server children from being queued up waiting to be able to also clear the cache.

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self::$lastRecursiveDeleteError = false;

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self::recursiveDelete(WP_CONTENT_DIR . '/wfcache/');

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if(self::$lastRecursiveDeleteError){

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self::$cacheStats['error'] = self::$lastRecursiveDeleteError;

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self::$cacheStats['totalErrors']++;

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}

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flock($fp, LOCK_UN);

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@unlink($cacheClearLock);

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@rmdir($cacheDir);

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}

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fclose($fp);

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return self::$cacheStats;

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}

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private static function recursiveDelete($dir) {

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$files = array_diff(scandir($dir), array('.','..'));

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foreach ($files as $file) {

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if(is_dir($dir . '/' . $file)){

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if(! self::recursiveDelete($dir . '/' . $file)){

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return false;

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}

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} else {

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if($file == 'clear.lock'){ continue; } //Don't delete our lock file

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$size = filesize($dir . '/' . $file);

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if($size){

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self::$cacheStats['totalData'] += round($size / 1024);

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}

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if(strpos($dir, 'wfcache/') === false){

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self::$lastRecursiveDeleteError = "Not deleting file in directory $dir because it appears to be in the wrong path.";

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self::$cacheStats['totalErrors']++;

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return false; //Safety check that we're in a subdir of the cache

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}

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if(@unlink($dir . '/' . $file)){

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self::$cacheStats['filesDeleted']++;

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} else {

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self::$lastRecursiveDeleteError = "Could not delete file " . $dir . "/" . $file . " : " . wfUtils::getLastError();

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self::$cacheStats['totalErrors']++;

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return false;

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}

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}

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}

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if($dir != WP_CONTENT_DIR . '/wfcache/'){

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if(strpos($dir, 'wfcache/') === false){

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self::$lastRecursiveDeleteError = "Not deleting directory $dir because it appears to be in the wrong path.";

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self::$cacheStats['totalErrors']++;

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return false; //Safety check that we're in a subdir of the cache

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}

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if(@rmdir($dir)){

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self::$cacheStats['dirsDeleted']++;

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} else {

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self::$lastRecursiveDeleteError = "Could not delete directory $dir : " . wfUtils::getLastError();

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self::$cacheStats['totalErrors']++;

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return false;

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}

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return true;

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} else {

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return true;

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}

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}

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public static function addHtaccessCode($action){

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if($action != 'remove'){

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die("Error: addHtaccessCode must be called with 'remove' as param");

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}

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$htaccessPath = self::getHtaccessPath();

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if(! $htaccessPath){

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return "Wordfence could not find your .htaccess file.";

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}

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$fh = @fopen($htaccessPath, 'r+');

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if(! $fh){

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$err = error_get_last();

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return $err['message'];

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}

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flock($fh, LOCK_EX);

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fseek($fh, 0, SEEK_SET); //start of file

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clearstatcache();

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$contents = fread($fh, filesize($htaccessPath));

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if(! $contents){

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fclose($fh);

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return "Could not read from $htaccessPath";

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}

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$contents = preg_replace('/#WFCACHECODE.*WFCACHECODE[\r\s\n\t]*/s', '', $contents);

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ftruncate($fh, 0);

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fflush($fh);

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fseek($fh, 0, SEEK_SET);

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fwrite($fh, $contents);

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flock($fh, LOCK_UN);

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fclose($fh);

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return false;

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}

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/**

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* @param $action

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* @return bool|string|void

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*/

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public static function updateBlockedIPs($action){ //'add' or 'remove'

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$htaccessPath = self::getHtaccessPath();

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if(! $htaccessPath){

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return "Wordfence could not find your .htaccess file.";

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}

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if($action == 'remove'){

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$fh = @fopen($htaccessPath, 'r+');

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if(! $fh){

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$err = error_get_last();

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return $err['message'];

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}

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flock($fh, LOCK_EX);

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fseek($fh, 0, SEEK_SET); //start of file

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clearstatcache();

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$contents = @fread($fh, filesize($htaccessPath));

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if(! $contents){

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fclose($fh);

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return "Could not read from $htaccessPath";

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}

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$contents = preg_replace('/#WFIPBLOCKS.*WFIPBLOCKS[\r\s\n\t]*/s', '', $contents);

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ftruncate($fh, 0);

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fflush($fh);

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fseek($fh, 0, SEEK_SET);

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@fwrite($fh, $contents);

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flock($fh, LOCK_UN);

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fclose($fh);

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return false;

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}

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return false;

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}

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public static function getHtaccessPath(){

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$homePath = wfUtils::getHomePath();

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$htaccessFile = $homePath.'.htaccess';

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return $htaccessFile;

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}

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public static function doNotCache(){

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if(! defined('WFDONOTCACHE')){

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define('WFDONOTCACHE', true);

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}

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}

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}

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