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 <?php
 /**
  * Zend Framework
  *
  * LICENSE
  *
  * This source file is subject to the new BSD license that is bundled
  * with this package in the file LICENSE.txt.
  * It is also available through the world-wide-web at this URL:
  * http://framework.zend.com/license/new-bsd
  * If you did not receive a copy of the license and are unable to
  * obtain it through the world-wide-web, please send an email
  * to license@zend.com so we can send you a copy immediately.
  *
  * @category   Zend
  * @package    Zend_Cache
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  * @version    $Id$
  */
 
 
 /**
  * @package    Zend_Cache
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  */
 class Zend_Cache_Core
 {
     /**
      * Messages
      */
     const BACKEND_NOT_SUPPORTS_TAG = 'tags are not supported by the current backend';
     const BACKEND_NOT_IMPLEMENTS_EXTENDED_IF = 'Current backend doesn\'t implement the Zend_Cache_Backend_ExtendedInterface, so this method is not available';
 
     /**
      * Backend Object
      *
      * @var Zend_Cache_Backend_Interface $_backend
      */
     protected $_backend = null;
 
     /**
      * Available options
      *
      * ====> (boolean) write_control :
      * - Enable / disable write control (the cache is read just after writing to detect corrupt entries)
      * - Enable write control will lightly slow the cache writing but not the cache reading
      * Write control can detect some corrupt cache files but maybe it's not a perfect control
      *
      * ====> (boolean) caching :
      * - Enable / disable caching
      * (can be very useful for the debug of cached scripts)
      *
      * =====> (string) cache_id_prefix :
      * - prefix for cache ids (namespace)
      *
      * ====> (boolean) automatic_serialization :
      * - Enable / disable automatic serialization
      * - It can be used to save directly datas which aren't strings (but it's slower)
      *
      * ====> (int) automatic_cleaning_factor :
      * - Disable / Tune the automatic cleaning process
      * - The automatic cleaning process destroy too old (for the given life time)
      *   cache files when a new cache file is written :
      *     0               => no automatic cache cleaning
      *     1               => systematic cache cleaning
      *     x (integer) > 1 => automatic cleaning randomly 1 times on x cache write
      *
      * ====> (int) lifetime :
      * - Cache lifetime (in seconds)
      * - If null, the cache is valid forever.
      *
      * ====> (boolean) logging :
      * - If set to true, logging is activated (but the system is slower)
      *
      * ====> (boolean) ignore_user_abort
      * - If set to true, the core will set the ignore_user_abort PHP flag inside the
      *   save() method to avoid cache corruptions in some cases (default false)
      *
      * @var array $_options available options
      */
     protected $_options = array(
         'write_control'             => true,
         'caching'                   => true,
         'cache_id_prefix'           => null,
         'automatic_serialization'   => false,
         'automatic_cleaning_factor' => 10,
         'lifetime'                  => 3600,
         'logging'                   => false,
         'logger'                    => null,
         'ignore_user_abort'         => false
     );
 
     /**
      * Array of options which have to be transfered to backend
      *
      * @var array $_directivesList
      */
     protected static $_directivesList = array('lifetime', 'logging', 'logger');
 
     /**
      * Not used for the core, just a sort a hint to get a common setOption() method (for the core and for frontends)
      *
      * @var array $_specificOptions
      */
     protected $_specificOptions = array();
 
     /**
      * Last used cache id
      *
      * @var string $_lastId
      */
     private $_lastId = null;
 
     /**
      * True if the backend implements Zend_Cache_Backend_ExtendedInterface
      *
      * @var boolean $_extendedBackend
      */
     protected $_extendedBackend = false;
 
     /**
      * Array of capabilities of the backend (only if it implements Zend_Cache_Backend_ExtendedInterface)
      *
      * @var array
      */
     protected $_backendCapabilities = array();
 
     /**
      * Constructor
      *
      * @param  array|Zend_Config $options Associative array of options or Zend_Config instance
      * @throws Zend_Cache_Exception
      * @return void
      */
     public function __construct($options = array())
     {
         if ($options instanceof Zend_Config) {
             $options = $options->toArray();
         }
         if (!is_array($options)) {
             Zend_Cache::throwException("Options passed were not an array"
             . " or Zend_Config instance.");
         }
         foreach ($options as $name => $value) {
             $this->setOption($name, $value);
         }
         $this->_loggerSanity();
     }
 
     /**
      * Set options using an instance of type Zend_Config
      *
      * @param Zend_Config $config
      * @return Zend_Cache_Core
      */
     public function setConfig(Zend_Config $config)
     {
         $options = $config->toArray();
         foreach ($options as $name => $value) {
             $this->setOption($name, $value);
         }
         return $this;
     }
 
     /**
      * Set the backend
      *
      * @param  Zend_Cache_Backend $backendObject
      * @throws Zend_Cache_Exception
      * @return void
      */
     public function setBackend(Zend_Cache_Backend $backendObject)
     {
         $this->_backend= $backendObject;
         // some options (listed in $_directivesList) have to be given
         // to the backend too (even if they are not "backend specific")
         $directives = array();
         foreach (Zend_Cache_Core::$_directivesList as $directive) {
             $directives[$directive] = $this->_options[$directive];
         }
         $this->_backend->setDirectives($directives);
         if (in_array('Zend_Cache_Backend_ExtendedInterface', class_implements($this->_backend))) {
             $this->_extendedBackend = true;
             $this->_backendCapabilities = $this->_backend->getCapabilities();
         }
 
     }
 
     /**
      * Returns the backend
      *
      * @return Zend_Cache_Backend backend object
      */
     public function getBackend()
     {
         return $this->_backend;
     }
 
     /**
      * Public frontend to set an option
      *
      * There is an additional validation (relatively to the protected _setOption method)
      *
      * @param  string $name  Name of the option
      * @param  mixed  $value Value of the option
      * @throws Zend_Cache_Exception
      * @return void
      */
     public function setOption($name, $value)
     {
         if (!is_string($name)) {
             Zend_Cache::throwException("Incorrect option name!");
         }
         $name = strtolower($name);
         if (array_key_exists($name, $this->_options)) {
             // This is a Core option
             $this->_setOption($name, $value);
             return;
         }
         if (array_key_exists($name, $this->_specificOptions)) {
             // This a specic option of this frontend
             $this->_specificOptions[$name] = $value;
             return;
         }
     }
 
     /**
      * Public frontend to get an option value
      *
      * @param  string $name  Name of the option
      * @throws Zend_Cache_Exception
      * @return mixed option value
      */
     public function getOption($name)
     {
         $name = strtolower($name);
 
         if (array_key_exists($name, $this->_options)) {
             // This is a Core option
             return $this->_options[$name];
         }
 
         if (array_key_exists($name, $this->_specificOptions)) {
             // This a specic option of this frontend
             return $this->_specificOptions[$name];
         }
 
         Zend_Cache::throwException("Incorrect option name : $name");
     }
 
     /**
      * Set an option
      *
      * @param  string $name  Name of the option
      * @param  mixed  $value Value of the option
      * @throws Zend_Cache_Exception
      * @return void
      */
     private function _setOption($name, $value)
     {
         if (!is_string($name) || !array_key_exists($name, $this->_options)) {
             Zend_Cache::throwException("Incorrect option name : $name");
         }
         if ($name == 'lifetime' && empty($value)) {
             $value = null;
         }
         $this->_options[$name] = $value;
     }
 
     /**
      * Force a new lifetime
      *
      * The new value is set for the core/frontend but for the backend too (directive)
      *
      * @param  int $newLifetime New lifetime (in seconds)
      * @return void
      */
     public function setLifetime($newLifetime)
     {
         $this->_options['lifetime'] = $newLifetime;
         $this->_backend->setDirectives(array(
             'lifetime' => $newLifetime
         ));
     }
 
     /**
      * Test if a cache is available for the given id and (if yes) return it (false else)
      *
      * @param  string  $id                     Cache id
      * @param  boolean $doNotTestCacheValidity If set to true, the cache validity won't be tested
      * @param  boolean $doNotUnserialize       Do not serialize (even if automatic_serialization is true) => for internal use
      * @return mixed|false Cached datas
      */
     public function load($id, $doNotTestCacheValidity = false, $doNotUnserialize = false)
     {
         if (!$this->_options['caching']) {
             return false;
         }
         $id = $this->_id($id); // cache id may need prefix
         $this->_lastId = $id;
         $this->_validateIdOrTag($id);
 
         $this->_log("Zend_Cache_Core: load item '{$id}'", 7);
         $data = $this->_backend->load($id, $doNotTestCacheValidity);
         if ($data===false) {
             // no cache available
             return false;
         }
         if ((!$doNotUnserialize) && $this->_options['automatic_serialization']) {
             // we need to unserialize before sending the result
             return unserialize($data);
         }
         return $data;
     }
 
     /**
      * Test if a cache is available for the given id
      *
      * @param  string $id Cache id
      * @return int|false Last modified time of cache entry if it is available, false otherwise
      */
     public function test($id)
     {
         if (!$this->_options['caching']) {
             return false;
         }
         $id = $this->_id($id); // cache id may need prefix
         $this->_validateIdOrTag($id);
         $this->_lastId = $id;
 
         $this->_log("Zend_Cache_Core: test item '{$id}'", 7);
         return $this->_backend->test($id);
     }
 
     /**
      * Save some data in a cache
      *
      * @param  mixed $data           Data to put in cache (can be another type than string if automatic_serialization is on)
      * @param  string $id             Cache id (if not set, the last cache id will be used)
      * @param  array $tags           Cache tags
      * @param  int $specificLifetime If != false, set a specific lifetime for this cache record (null => infinite lifetime)
      * @param  int   $priority         integer between 0 (very low priority) and 10 (maximum priority) used by some particular backends
      * @throws Zend_Cache_Exception
      * @return boolean True if no problem
      */
     public function save($data, $id = null, $tags = array(), $specificLifetime = false, $priority = 8)
     {
         if (!$this->_options['caching']) {
             return true;
         }
         if ($id === null) {
             $id = $this->_lastId;
         } else {
             $id = $this->_id($id);
         }
         $this->_validateIdOrTag($id);
         $this->_validateTagsArray($tags);
         if ($this->_options['automatic_serialization']) {
             // we need to serialize datas before storing them
             $data = serialize($data);
         } else {
             if (!is_string($data)) {
                 Zend_Cache::throwException("Datas must be string or set automatic_serialization = true");
             }
         }
 
         // automatic cleaning
         if ($this->_options['automatic_cleaning_factor'] > 0) {
             $rand = rand(1, $this->_options['automatic_cleaning_factor']);
             if ($rand==1) {
                 //  new way                 || deprecated way
                 if ($this->_extendedBackend || method_exists($this->_backend, 'isAutomaticCleaningAvailable')) {
                     $this->_log("Zend_Cache_Core::save(): automatic cleaning running", 7);
                     $this->clean(Zend_Cache::CLEANING_MODE_OLD);
                 } else {
                     $this->_log("Zend_Cache_Core::save(): automatic cleaning is not available/necessary with current backend", 4);
                 }
             }
         }
 
         $this->_log("Zend_Cache_Core: save item '{$id}'", 7);
         if ($this->_options['ignore_user_abort']) {
             $abort = ignore_user_abort(true);
         }
         if (($this->_extendedBackend) && ($this->_backendCapabilities['priority'])) {
             $result = $this->_backend->save($data, $id, $tags, $specificLifetime, $priority);
         } else {
             $result = $this->_backend->save($data, $id, $tags, $specificLifetime);
         }
         if ($this->_options['ignore_user_abort']) {
             ignore_user_abort($abort);
         }
 
         if (!$result) {
             // maybe the cache is corrupted, so we remove it !
             $this->_log("Zend_Cache_Core::save(): failed to save item '{$id}' -> removing it", 4);
             $this->_backend->remove($id);
             return false;
         }
 
         if ($this->_options['write_control']) {
             $data2 = $this->_backend->load($id, true);
             if ($data!=$data2) {
                 $this->_log("Zend_Cache_Core::save(): write control of item '{$id}' failed -> removing it", 4);
                 $this->_backend->remove($id);
                 return false;
             }
         }
 
         return true;
     }
 
     /**
      * Remove a cache
      *
      * @param  string $id Cache id to remove
      * @return boolean True if ok
      */
     public function remove($id)
     {
         if (!$this->_options['caching']) {
             return true;
         }
         $id = $this->_id($id); // cache id may need prefix
         $this->_validateIdOrTag($id);
 
         $this->_log("Zend_Cache_Core: remove item '{$id}'", 7);
         return $this->_backend->remove($id);
     }
 
     /**
      * Clean cache entries
      *
      * Available modes are :
      * 'all' (default)  => remove all cache entries ($tags is not used)
      * 'old'            => remove too old cache entries ($tags is not used)
      * 'matchingTag'    => remove cache entries matching all given tags
      *                     ($tags can be an array of strings or a single string)
      * 'notMatchingTag' => remove cache entries not matching one of the given tags
      *                     ($tags can be an array of strings or a single string)
      * 'matchingAnyTag' => remove cache entries matching any given tags
      *                     ($tags can be an array of strings or a single string)
      *
      * @param  string       $mode
      * @param  array|string $tags
      * @throws Zend_Cache_Exception
      * @return boolean True if ok
      */
     public function clean($mode = 'all', $tags = array())
     {
         if (!$this->_options['caching']) {
             return true;
         }
         if (!in_array($mode, array(Zend_Cache::CLEANING_MODE_ALL,
                                    Zend_Cache::CLEANING_MODE_OLD,
                                    Zend_Cache::CLEANING_MODE_MATCHING_TAG,
                                    Zend_Cache::CLEANING_MODE_NOT_MATCHING_TAG,
                                    Zend_Cache::CLEANING_MODE_MATCHING_ANY_TAG))) {
             Zend_Cache::throwException('Invalid cleaning mode');
         }
         $this->_validateTagsArray($tags);
 
         return $this->_backend->clean($mode, $tags);
     }
 
     /**
      * Return an array of stored cache ids which match given tags
      *
      * In case of multiple tags, a logical AND is made between tags
      *
      * @param array $tags array of tags
      * @return array array of matching cache ids (string)
      */
     public function getIdsMatchingTags($tags = array())
     {
         if (!$this->_extendedBackend) {
             Zend_Cache::throwException(self::BACKEND_NOT_IMPLEMENTS_EXTENDED_IF);
         }
         if (!($this->_backendCapabilities['tags'])) {
             Zend_Cache::throwException(self::BACKEND_NOT_SUPPORTS_TAG);
         }
 
         $ids = $this->_backend->getIdsMatchingTags($tags);
 
         // we need to remove cache_id_prefix from ids (see #ZF-6178, #ZF-7600)
         if (isset($this->_options['cache_id_prefix']) && $this->_options['cache_id_prefix'] !== '') {
             $prefix    = & $this->_options['cache_id_prefix'];
             $prefixLen = strlen($prefix);
             foreach ($ids as &$id) {
                 if (strpos($id, $prefix) === 0) {
                     $id = substr($id, $prefixLen);
                 }
             }
         }
 
         return $ids;
     }
 
     /**
      * Return an array of stored cache ids which don't match given tags
      *
      * In case of multiple tags, a logical OR is made between tags
      *
      * @param array $tags array of tags
      * @return array array of not matching cache ids (string)
      */
     public function getIdsNotMatchingTags($tags = array())
     {
         if (!$this->_extendedBackend) {
             Zend_Cache::throwException(self::BACKEND_NOT_IMPLEMENTS_EXTENDED_IF);
         }
         if (!($this->_backendCapabilities['tags'])) {
             Zend_Cache::throwException(self::BACKEND_NOT_SUPPORTS_TAG);
         }
 
         $ids = $this->_backend->getIdsNotMatchingTags($tags);
 
         // we need to remove cache_id_prefix from ids (see #ZF-6178, #ZF-7600)
         if (isset($this->_options['cache_id_prefix']) && $this->_options['cache_id_prefix'] !== '') {
             $prefix    = & $this->_options['cache_id_prefix'];
             $prefixLen = strlen($prefix);
             foreach ($ids as &$id) {
                 if (strpos($id, $prefix) === 0) {
                     $id = substr($id, $prefixLen);
                 }
             }
         }
 
         return $ids;
     }
 
     /**
      * Return an array of stored cache ids which match any given tags
      *
      * In case of multiple tags, a logical OR is made between tags
      *
      * @param array $tags array of tags
      * @return array array of matching any cache ids (string)
      */
     public function getIdsMatchingAnyTags($tags = array())
     {
         if (!$this->_extendedBackend) {
             Zend_Cache::throwException(self::BACKEND_NOT_IMPLEMENTS_EXTENDED_IF);
         }
         if (!($this->_backendCapabilities['tags'])) {
             Zend_Cache::throwException(self::BACKEND_NOT_SUPPORTS_TAG);
         }
 
         $ids = $this->_backend->getIdsMatchingAnyTags($tags);
 
         // we need to remove cache_id_prefix from ids (see #ZF-6178, #ZF-7600)
         if (isset($this->_options['cache_id_prefix']) && $this->_options['cache_id_prefix'] !== '') {
             $prefix    = & $this->_options['cache_id_prefix'];
             $prefixLen = strlen($prefix);
             foreach ($ids as &$id) {
                 if (strpos($id, $prefix) === 0) {
                     $id = substr($id, $prefixLen);
                 }
             }
         }
 
         return $ids;
     }
 
     /**
      * Return an array of stored cache ids
      *
      * @return array array of stored cache ids (string)
      */
     public function getIds()
     {
         if (!$this->_extendedBackend) {
             Zend_Cache::throwException(self::BACKEND_NOT_IMPLEMENTS_EXTENDED_IF);
         }
 
         $ids = $this->_backend->getIds();
 
         // we need to remove cache_id_prefix from ids (see #ZF-6178, #ZF-7600)
         if (isset($this->_options['cache_id_prefix']) && $this->_options['cache_id_prefix'] !== '') {
             $prefix    = & $this->_options['cache_id_prefix'];
             $prefixLen = strlen($prefix);
             foreach ($ids as &$id) {
                 if (strpos($id, $prefix) === 0) {
                     $id = substr($id, $prefixLen);
                 }
             }
         }
 
         return $ids;
     }
 
     /**
      * Return an array of stored tags
      *
      * @return array array of stored tags (string)
      */
     public function getTags()
     {
         if (!$this->_extendedBackend) {
             Zend_Cache::throwException(self::BACKEND_NOT_IMPLEMENTS_EXTENDED_IF);
         }
         if (!($this->_backendCapabilities['tags'])) {
             Zend_Cache::throwException(self::BACKEND_NOT_SUPPORTS_TAG);
         }
         return $this->_backend->getTags();
     }
 
     /**
      * Return the filling percentage of the backend storage
      *
      * @return int integer between 0 and 100
      */
     public function getFillingPercentage()
     {
         if (!$this->_extendedBackend) {
             Zend_Cache::throwException(self::BACKEND_NOT_IMPLEMENTS_EXTENDED_IF);
         }
         return $this->_backend->getFillingPercentage();
     }
 
     /**
      * Return an array of metadatas for the given cache id
      *
      * The array will include these keys :
      * - expire : the expire timestamp
      * - tags : a string array of tags
      * - mtime : timestamp of last modification time
      *
      * @param string $id cache id
      * @return array array of metadatas (false if the cache id is not found)
      */
     public function getMetadatas($id)
     {
         if (!$this->_extendedBackend) {
             Zend_Cache::throwException(self::BACKEND_NOT_IMPLEMENTS_EXTENDED_IF);
         }
         $id = $this->_id($id); // cache id may need prefix
         return $this->_backend->getMetadatas($id);
     }
 
     /**
      * Give (if possible) an extra lifetime to the given cache id
      *
      * @param string $id cache id
      * @param int $extraLifetime
      * @return boolean true if ok
      */
     public function touch($id, $extraLifetime)
     {
         if (!$this->_extendedBackend) {
             Zend_Cache::throwException(self::BACKEND_NOT_IMPLEMENTS_EXTENDED_IF);
         }
         $id = $this->_id($id); // cache id may need prefix
 
         $this->_log("Zend_Cache_Core: touch item '{$id}'", 7);
         return $this->_backend->touch($id, $extraLifetime);
     }
 
     /**
      * Validate a cache id or a tag (security, reliable filenames, reserved prefixes...)
      *
      * Throw an exception if a problem is found
      *
      * @param  string $string Cache id or tag
      * @throws Zend_Cache_Exception
      * @return void
      */
     protected function _validateIdOrTag($string)
     {
         if (!is_string($string)) {
             Zend_Cache::throwException('Invalid id or tag : must be a string');
         }
         if (substr($string, 0, 9) == 'internal-') {
             Zend_Cache::throwException('"internal-*" ids or tags are reserved');
         }
         if (!preg_match('~^[a-zA-Z0-9_]+$~D', $string)) {
             Zend_Cache::throwException("Invalid id or tag '$string' : must use only [a-zA-Z0-9_]");
         }
     }
 
     /**
      * Validate a tags array (security, reliable filenames, reserved prefixes...)
      *
      * Throw an exception if a problem is found
      *
      * @param  array $tags Array of tags
      * @throws Zend_Cache_Exception
      * @return void
      */
     protected function _validateTagsArray($tags)
     {
         if (!is_array($tags)) {
             Zend_Cache::throwException('Invalid tags array : must be an array');
         }
         foreach($tags as $tag) {
             $this->_validateIdOrTag($tag);
         }
         reset($tags);
     }
 
     /**
      * Make sure if we enable logging that the Zend_Log class
      * is available.
      * Create a default log object if none is set.
      *
      * @throws Zend_Cache_Exception
      * @return void
      */
     protected function _loggerSanity()
     {
         if (!isset($this->_options['logging']) || !$this->_options['logging']) {
             return;
         }
 
         if (isset($this->_options['logger']) && $this->_options['logger'] instanceof Zend_Log) {
             return;
         }
 
         // Create a default logger to the standard output stream
         // require_once 'Zend/Log.php';
         // require_once 'Zend/Log/Writer/Stream.php';
         // require_once 'Zend/Log/Filter/Priority.php';
         $logger = new Zend_Log(new Zend_Log_Writer_Stream('php://output'));
         $logger->addFilter(new Zend_Log_Filter_Priority(Zend_Log::WARN, '<='));
         $this->_options['logger'] = $logger;
     }
 
     /**
      * Log a message at the WARN (4) priority.
      *
      * @param string $message
      * @throws Zend_Cache_Exception
      * @return void
      */
     protected function _log($message, $priority = 4)
     {
         if (!$this->_options['logging']) {
             return;
         }
         if (!(isset($this->_options['logger']) || $this->_options['logger'] instanceof Zend_Log)) {
             Zend_Cache::throwException('Logging is enabled but logger is not set');
         }
         $logger = $this->_options['logger'];
         $logger->log($message, $priority);
     }
 
     /**
      * Make and return a cache id
      *
      * Checks 'cache_id_prefix' and returns new id with prefix or simply the id if null
      *
      * @param  string $id Cache id
      * @return string Cache id (with or without prefix)
      */
     protected function _id($id)
     {
         if (($id !== null) && isset($this->_options['cache_id_prefix'])) {
             return $this->_options['cache_id_prefix'] . $id; // return with prefix
         }
         return $id; // no prefix, just return the $id passed
     }
 
 }