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<?php

/**
 * Matomo - free/libre analytics platform
 *
 * @link https://matomo.org
 * @license http://www.gnu.org/licenses/lgpl-3.0.html LGPL v3 or later
 *
 */
namespace Matomo\Cache\Backend;

use Doctrine\Common\Cache\PhpFileCache;
use Matomo\Cache\Backend;
/**
 * This class is used to cache data on the filesystem.
 *
 * This cache creates one file per id. Every time you try to read the value it will load the cache file again. It will
 * try to invalidate the Opcache for a specific cache file if needed.
 */
class File extends PhpFileCache implements Backend
{
    // for testing purposes since tests run on both CLI/FPM (changes in CLI can't invalidate
    // opcache in FPM, so we have to invalidate before reading)
    public static $invalidateOpCacheBeforeRead = false;
    private $supportsParseError = false;
    /**
     * Constructor.
     *
     * @param string      $directory The cache directory.
     * @param string|null $extension The cache file extension.
     *
     * @throws \InvalidArgumentException
     */
    public function __construct($directory, $extension = '.php')
    {
        if (!is_dir($directory)) {
            $this->createDirectory($directory);
        }
        $this->supportsParseError = defined('PHP_MAJOR_VERSION') && PHP_MAJOR_VERSION >= 7 && class_exists('\\ParseError');
        parent::__construct($directory, $extension);
    }
    public function doFetch($id)
    {
        if (self::$invalidateOpCacheBeforeRead) {
            $this->invalidateCacheFile($id);
        }
        if ($this->supportsParseError) {
            try {
                return parent::doFetch($id);
            } catch (\ParseError $e) {
                return false;
            }
        }
        return parent::doFetch($id);
    }
    public function doContains($id)
    {
        return parent::doContains($id);
    }
    public function doSave($id, $data, $lifeTime = 0)
    {
        if (!is_dir($this->directory)) {
            $this->createDirectory($this->directory);
        }
        $success = parent::doSave($id, $data, $lifeTime);
        if ($success) {
            $this->invalidateCacheFile($id);
        }
        return $success;
    }
    public function doDelete($id)
    {
        $this->invalidateCacheFile($id);
        $success = parent::doDelete($id);
        $this->invalidateCacheFile($id);
        // in case file was cached by another request between invalidate and doDelete()
        return $success;
    }
    public function doFlush()
    {
        // if the directory does not exist, do not bother to continue clearing
        if (!is_dir($this->directory)) {
            return false;
        }
        foreach ($this->getFileIterator() as $name => $file) {
            $this->opCacheInvalidate($name);
        }
        return parent::doFlush();
    }
    private function invalidateCacheFile($id)
    {
        $filename = $this->getFilename($id);
        $this->opCacheInvalidate($filename);
    }
    /**
     * @param string $id
     *
     * @return string
     */
    public function getFilename($id)
    {
        $path = $this->directory . DIRECTORY_SEPARATOR;
        $id = preg_replace('@[\\\\/:"*?<>|]+@', '', $id);
        return $path . $id . $this->getExtension();
    }
    private function opCacheInvalidate($filepath)
    {
        if (is_file($filepath)) {
            if (function_exists('opcache_invalidate')) {
                @opcache_invalidate($filepath, $force = true);
            }
            if (function_exists('apc_delete_file')) {
                @apc_delete_file($filepath);
            }
        }
    }
    /**
     * @return \Iterator
     */
    private function getFileIterator()
    {
        $pattern = '/^.+\\' . $this->getExtension() . '$/i';
        $iterator = new \RecursiveDirectoryIterator($this->directory);
        $iterator = new \RecursiveIteratorIterator($iterator);
        return new \RegexIterator($iterator, $pattern);
    }
    private function createDirectory($path)
    {
        if (!is_dir($path)) {
            // the mode in mkdir is modified by the current umask
            @mkdir($path, 0750, $recursive = true);
        }
        // try to overcome restrictive umask (mis-)configuration
        if (!is_writable($path)) {
            @chmod($path, 0755);
            if (!is_writable($path)) {
                @chmod($path, 0775);
                // enough! we're not going to make the directory world-writeable
            }
        }
    }
}