Static.php

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<?php
#require_once 'Zend/Cache/Backend/Interface.php';

#require_once 'Zend/Cache/Backend.php';

class Zend_Cache_Backend_Static
    extends Zend_Cache_Backend
    implements Zend_Cache_Backend_Interface
{
    const INNER_CACHE_NAME = 'zend_cache_backend_static_tagcache';

    protected $_options = array(
        'public_dir'           => null,
        'sub_dir'              => 'html',
        'file_extension'       => '.html',
        'index_filename'       => 'index',
        'file_locking'         => true,
        'cache_file_perm'      => 0600,
        'cache_directory_perm' => 0700,
        'debug_header'         => false,
        'tag_cache'            => null,
        'disable_caching'      => false
    );

    protected $_tagCache = null;

    protected $_tagged = null;

    public function setOption($name, $value)
    {
        if ($name == 'tag_cache') {
            $this->setInnerCache($value);
        } else {
            // See #ZF-12047 and #GH-91
            if ($name == 'cache_file_umask') {
                trigger_error(
                    "'cache_file_umask' is deprecated -> please use 'cache_file_perm' instead",
                    E_USER_NOTICE
                );

                $name = 'cache_file_perm';
            }
            if ($name == 'cache_directory_umask') {
                trigger_error(
                    "'cache_directory_umask' is deprecated -> please use 'cache_directory_perm' instead",
                    E_USER_NOTICE
                );

                $name = 'cache_directory_perm';
            }

            parent::setOption($name, $value);
        }
        return $this;
    }

    public function getOption($name)
    {
        $name = strtolower($name);

        if ($name == 'tag_cache') {
            return $this->getInnerCache();
        }

        return parent::getOption($name);
    }

    public function load($id, $doNotTestCacheValidity = false)
    {
        if (($id = (string)$id) === '') {
            $id = $this->_detectId();
        } else {
            $id = $this->_decodeId($id);
        }
        if (!$this->_verifyPath($id)) {
            Zend_Cache::throwException('Invalid cache id: does not match expected public_dir path');
        }
        if ($doNotTestCacheValidity) {
            $this->_log("Zend_Cache_Backend_Static::load() : \$doNotTestCacheValidity=true is unsupported by the Static backend");
        }

        $fileName = basename($id);
        if ($fileName === '') {
            $fileName = $this->_options['index_filename'];
        }
        $pathName = $this->_options['public_dir'] . dirname($id);
        $file     = rtrim($pathName, '/') . '/' . $fileName . $this->_options['file_extension'];
        if (file_exists($file)) {
            $content = file_get_contents($file);
            return $content;
        }

        return false;
    }

    public function test($id)
    {
        $id = $this->_decodeId($id);
        if (!$this->_verifyPath($id)) {
            Zend_Cache::throwException('Invalid cache id: does not match expected public_dir path');
        }

        $fileName = basename($id);
        if ($fileName === '') {
            $fileName = $this->_options['index_filename'];
        }
        if ($this->_tagged === null && $tagged = $this->getInnerCache()->load(self::INNER_CACHE_NAME)) {
            $this->_tagged = $tagged;
        } elseif (!$this->_tagged) {
            return false;
        }
        $pathName = $this->_options['public_dir'] . dirname($id);

        // Switch extension if needed
        if (isset($this->_tagged[$id])) {
            $extension = $this->_tagged[$id]['extension'];
        } else {
            $extension = $this->_options['file_extension'];
        }
        $file     = $pathName . '/' . $fileName . $extension;
        if (file_exists($file)) {
            return true;
        }
        return false;
    }

    public function save($data, $id, $tags = array(), $specificLifetime = false)
    {
        if ($this->_options['disable_caching']) {
            return true;
        }
        $extension = null;
        if ($this->_isSerialized($data)) {
            $data = unserialize($data);
            $extension = '.' . ltrim($data[1], '.');
            $data = $data[0];
        }

        clearstatcache();
        if (($id = (string)$id) === '') {
            $id = $this->_detectId();
        } else {
            $id = $this->_decodeId($id);
        }

        $fileName = basename($id);
        if ($fileName === '') {
            $fileName = $this->_options['index_filename'];
        }

        $pathName = realpath($this->_options['public_dir']) . dirname($id);
        $this->_createDirectoriesFor($pathName);

        if ($id === null || strlen($id) == 0) {
            $dataUnserialized = unserialize($data);
            $data = $dataUnserialized['data'];
        }
        $ext = $this->_options['file_extension'];
        if ($extension) $ext = $extension;
        $file = rtrim($pathName, '/') . '/' . $fileName . $ext;
        if ($this->_options['file_locking']) {
            $result = file_put_contents($file, $data, LOCK_EX);
        } else {
            $result = file_put_contents($file, $data);
        }
        @chmod($file, $this->_octdec($this->_options['cache_file_perm']));

        if ($this->_tagged === null && $tagged = $this->getInnerCache()->load(self::INNER_CACHE_NAME)) {
            $this->_tagged = $tagged;
        } elseif ($this->_tagged === null) {
            $this->_tagged = array();
        }
        if (!isset($this->_tagged[$id])) {
            $this->_tagged[$id] = array();
        }
        if (!isset($this->_tagged[$id]['tags'])) {
            $this->_tagged[$id]['tags'] = array();
        }
        $this->_tagged[$id]['tags'] = array_unique(array_merge($this->_tagged[$id]['tags'], $tags));
        $this->_tagged[$id]['extension'] = $ext;
        $this->getInnerCache()->save($this->_tagged, self::INNER_CACHE_NAME);
        return (bool) $result;
    }

    protected function _createDirectoriesFor($path)
    {
        if (!is_dir($path)) {
            $oldUmask = umask(0);
            if ( !@mkdir($path, $this->_octdec($this->_options['cache_directory_perm']), true)) {
                $lastErr = error_get_last();
                umask($oldUmask);
                Zend_Cache::throwException("Can't create directory: {$lastErr['message']}");
            }
            umask($oldUmask);
        }
    }

    protected function _isSerialized($data)
    {
        return preg_match("/a:2:\{i:0;s:\d+:\"/", $data);
    }

    public function remove($id)
    {
        if (!$this->_verifyPath($id)) {
            Zend_Cache::throwException('Invalid cache id: does not match expected public_dir path');
        }
        $fileName = basename($id);
        if ($this->_tagged === null && $tagged = $this->getInnerCache()->load(self::INNER_CACHE_NAME)) {
            $this->_tagged = $tagged;
        } elseif (!$this->_tagged) {
            return false;
        }
        if (isset($this->_tagged[$id])) {
            $extension = $this->_tagged[$id]['extension'];
        } else {
            $extension = $this->_options['file_extension'];
        }
        if ($fileName === '') {
            $fileName = $this->_options['index_filename'];
        }
        $pathName = $this->_options['public_dir'] . dirname($id);
        $file     = realpath($pathName) . '/' . $fileName . $extension;
        if (!file_exists($file)) {
            return false;
        }
        return unlink($file);
    }

    public function removeRecursively($id)
    {
        if (!$this->_verifyPath($id)) {
            Zend_Cache::throwException('Invalid cache id: does not match expected public_dir path');
        }
        $fileName = basename($id);
        if ($fileName === '') {
            $fileName = $this->_options['index_filename'];
        }
        $pathName  = $this->_options['public_dir'] . dirname($id);
        $file      = $pathName . '/' . $fileName . $this->_options['file_extension'];
        $directory = $pathName . '/' . $fileName;
        if (file_exists($directory)) {
            if (!is_writable($directory)) {
                return false;
            }
            if (is_dir($directory)) {
                foreach (new DirectoryIterator($directory) as $file) {
                    if (true === $file->isFile()) {
                        if (false === unlink($file->getPathName())) {
                            return false;
                        }
                    }
                }
            }
            rmdir($directory);
        }
        if (file_exists($file)) {
            if (!is_writable($file)) {
                return false;
            }
            return unlink($file);
        }
        return true;
    }

    public function clean($mode = Zend_Cache::CLEANING_MODE_ALL, $tags = array())
    {
        $result = false;
        switch ($mode) {
            case Zend_Cache::CLEANING_MODE_MATCHING_TAG:
            case Zend_Cache::CLEANING_MODE_MATCHING_ANY_TAG:
                if (empty($tags)) {
                    throw new Zend_Exception('Cannot use tag matching modes as no tags were defined');
                }
                if ($this->_tagged === null && $tagged = $this->getInnerCache()->load(self::INNER_CACHE_NAME)) {
                    $this->_tagged = $tagged;
                } elseif (!$this->_tagged) {
                    return true;
                }
                foreach ($tags as $tag) {
                    $urls = array_keys($this->_tagged);
                    foreach ($urls as $url) {
                        if (isset($this->_tagged[$url]['tags']) && in_array($tag, $this->_tagged[$url]['tags'])) {
                            $this->remove($url);
                            unset($this->_tagged[$url]);
                        }
                    }
                }
                $this->getInnerCache()->save($this->_tagged, self::INNER_CACHE_NAME);
                $result = true;
                break;
            case Zend_Cache::CLEANING_MODE_ALL:
                if ($this->_tagged === null) {
                    $tagged = $this->getInnerCache()->load(self::INNER_CACHE_NAME);
                    $this->_tagged = $tagged;
                }
                if ($this->_tagged === null || empty($this->_tagged)) {
                    return true;
                }
                $urls = array_keys($this->_tagged);
                foreach ($urls as $url) {
                    $this->remove($url);
                    unset($this->_tagged[$url]);
                }
                $this->getInnerCache()->save($this->_tagged, self::INNER_CACHE_NAME);
                $result = true;
                break;
            case Zend_Cache::CLEANING_MODE_OLD:
                $this->_log("Zend_Cache_Backend_Static : Selected Cleaning Mode Currently Unsupported By This Backend");
                break;
            case Zend_Cache::CLEANING_MODE_NOT_MATCHING_TAG:
                if (empty($tags)) {
                    throw new Zend_Exception('Cannot use tag matching modes as no tags were defined');
                }
                if ($this->_tagged === null) {
                    $tagged = $this->getInnerCache()->load(self::INNER_CACHE_NAME);
                    $this->_tagged = $tagged;
                }
                if ($this->_tagged === null || empty($this->_tagged)) {
                    return true;
                }
                $urls = array_keys($this->_tagged);
                foreach ($urls as $url) {
                    $difference = array_diff($tags, $this->_tagged[$url]['tags']);
                    if (count($tags) == count($difference)) {
                        $this->remove($url);
                        unset($this->_tagged[$url]);
                    }
                }
                $this->getInnerCache()->save($this->_tagged, self::INNER_CACHE_NAME);
                $result = true;
                break;
            default:
                Zend_Cache::throwException('Invalid mode for clean() method');
                break;
        }
        return $result;
    }

    public function setInnerCache(Zend_Cache_Core $cache)
    {
        $this->_tagCache = $cache;
        $this->_options['tag_cache'] = $cache;
    }

    public function getInnerCache()
    {
        if ($this->_tagCache === null) {
            Zend_Cache::throwException('An Inner Cache has not been set; use setInnerCache()');
        }
        return $this->_tagCache;
    }

    protected function _verifyPath($path)
    {
        $path = realpath($path);
        $base = realpath($this->_options['public_dir']);
        return strncmp($path, $base, strlen($base)) !== 0;
    }

    protected function _detectId()
    {
        return $_SERVER['REQUEST_URI'];
    }

    protected static function _validateIdOrTag($string)
    {
        if (!is_string($string)) {
            Zend_Cache::throwException('Invalid id or tag : must be a string');
        }

        // Internal only checked in Frontend - not here!
        if (substr($string, 0, 9) == 'internal-') {
            return;
        }

        // Validation assumes no query string, fragments or scheme included - only the path
        if (!preg_match(
                '/^(?:\/(?:(?:%[[:xdigit:]]{2}|[A-Za-z0-9-_.!~*\'()\[\]:@&=+$,;])*)?)+$/',
                $string
            )
        ) {
            Zend_Cache::throwException("Invalid id or tag '$string' : must be a valid URL path");
        }
    }

    protected function _octdec($val)
    {
        if (is_string($val) && decoct(octdec($val)) == $val) {
            return octdec($val);
        }
        return $val;
    }

    protected function _decodeId($id)
    {
        return pack('H*', $id);
    }
}