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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
  * @subpackage Zend_Cache_Backend
  * @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
  * @subpackage Zend_Cache_Backend
  * @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_Backend
 {
     /**
      * Frontend or Core directives
      *
      * =====> (int) lifetime :
      * - Cache lifetime (in seconds)
      * - If null, the cache is valid forever
      *
      * =====> (int) logging :
      * - if set to true, a logging is activated throw Zend_Log
      *
      * @var array directives
      */
     protected $_directives = array(
         'lifetime' => 3600,
         'logging'  => false,
         'logger'   => null
     );
 
     /**
      * Available options
      *
      * @var array available options
      */
     protected $_options = array();
 
     /**
      * Constructor
      *
      * @param  array $options Associative array of options
      */
     public function __construct(array $options = array())
     {
         foreach ($options as $name => $value) {
             $this->setOption($name, $value);
         }
     }
 
     /**
      * Set the frontend directives
      *
      * @param  array $directives Assoc of directives
      * @throws Zend_Cache_Exception
      * @return void
      */
     public function setDirectives($directives)
     {
         if (!is_array($directives)) Zend_Cache::throwException('Directives parameter must be an array');
         while (list($name, $value) = each($directives)) {
             if (!is_string($name)) {
                 Zend_Cache::throwException("Incorrect option name : $name");
             }
             $name = strtolower($name);
             if (array_key_exists($name, $this->_directives)) {
                 $this->_directives[$name] = $value;
             }
 
         }
 
         $this->_loggerSanity();
     }
 
     /**
      * Set an option
      *
      * @param  string $name
      * @param  mixed  $value
      * @throws Zend_Cache_Exception
      * @return void
      */
     public function setOption($name, $value)
     {
         if (!is_string($name)) {
             Zend_Cache::throwException("Incorrect option name : $name");
         }
         $name = strtolower($name);
         if (array_key_exists($name, $this->_options)) {
             $this->_options[$name] = $value;
         }
     }
 
     /**
      * Returns an option
      *
      * @param string $name Optional, the options name to return
      * @throws Zend_Cache_Exceptions
      * @return mixed
      */
     public function getOption($name)
     {
         $name = strtolower($name);
 
         if (array_key_exists($name, $this->_options)) {
             return $this->_options[$name];
         }
 
         if (array_key_exists($name, $this->_directives)) {
             return $this->_directives[$name];
         }
 
         Zend_Cache::throwException("Incorrect option name : {$name}");
     }
 
     /**
      * Get the life time
      *
      * if $specificLifetime is not false, the given specific life time is used
      * else, the global lifetime is used
      *
      * @param  int $specificLifetime
      * @return int Cache life time
      */
     public function getLifetime($specificLifetime)
     {
         if ($specificLifetime === false) {
             return $this->_directives['lifetime'];
         }
         return $specificLifetime;
     }
 
     /**
      * Return true if the automatic cleaning is available for the backend
      *
      * DEPRECATED : use getCapabilities() instead
      *
      * @deprecated
      * @return boolean
      */
     public function isAutomaticCleaningAvailable()
     {
         return true;
     }
 
     /**
      * Determine system TMP directory and detect if we have read access
      *
      * inspired from Zend_File_Transfer_Adapter_Abstract
      *
      * @return string
      * @throws Zend_Cache_Exception if unable to determine directory
      */
     public function getTmpDir()
     {
         $tmpdir = array();
         foreach (array($_ENV, $_SERVER) as $tab) {
             foreach (array('TMPDIR', 'TEMP', 'TMP', 'windir', 'SystemRoot') as $key) {
                 if (isset($tab[$key]) && is_string($tab[$key])) {
                     if (($key == 'windir') or ($key == 'SystemRoot')) {
                         $dir = realpath($tab[$key] . '\\temp');
                     } else {
                         $dir = realpath($tab[$key]);
                     }
                     if ($this->_isGoodTmpDir($dir)) {
                         return $dir;
                     }
                 }
             }
         }
         $upload = ini_get('upload_tmp_dir');
         if ($upload) {
             $dir = realpath($upload);
             if ($this->_isGoodTmpDir($dir)) {
                 return $dir;
             }
         }
         if (function_exists('sys_get_temp_dir')) {
             $dir = sys_get_temp_dir();
             if ($this->_isGoodTmpDir($dir)) {
                 return $dir;
             }
         }
         // Attemp to detect by creating a temporary file
         $tempFile = tempnam(md5(uniqid(rand(), TRUE)), '');
         if ($tempFile) {
             $dir = realpath(dirname($tempFile));
             unlink($tempFile);
             if ($this->_isGoodTmpDir($dir)) {
                 return $dir;
             }
         }
         if ($this->_isGoodTmpDir('/tmp')) {
             return '/tmp';
         }
         if ($this->_isGoodTmpDir('\\temp')) {
             return '\\temp';
         }
         Zend_Cache::throwException('Could not determine temp directory, please specify a cache_dir manually');
     }
 
     /**
      * Verify if the given temporary directory is readable and writable
      *
      * @param string $dir temporary directory
      * @return boolean true if the directory is ok
      */
     protected function _isGoodTmpDir($dir)
     {
         if (is_readable($dir)) {
             if (is_writable($dir)) {
                 return true;
             }
         }
         return false;
     }
 
     /**
      * 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($this->_directives['logging']) || !$this->_directives['logging']) {
             return;
         }
 
         if (isset($this->_directives['logger'])) {
             if ($this->_directives['logger'] instanceof Zend_Log) {
                 return;
             }
             Zend_Cache::throwException('Logger object is not an instance of Zend_Log class.');
         }
 
         // 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->_directives['logger'] = $logger;
     }
 
     /**
      * Log a message at the WARN (4) priority.
      *
      * @param  string $message
      * @param  int    $priority
      * @return void
      */
     protected function _log($message, $priority = 4)
     {
         if (!$this->_directives['logging']) {
             return;
         }
 
         if (!isset($this->_directives['logger'])) {
             Zend_Cache::throwException('Logging is enabled but logger is not set.');
         }
         $logger = $this->_directives['logger'];
         if (!$logger instanceof Zend_Log) {
             Zend_Cache::throwException('Logger object is not an instance of Zend_Log class.');
         }
         $logger->log($message, $priority);
     }
 }