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   1  <?php
   2  /**
   3   * MyBB 1.8
   4   * Copyright 2014 MyBB Group, All Rights Reserved
   5   *
   6   * Website: http://www.mybb.com
   7   * License: http://www.mybb.com/about/license
   8   *
   9   */
  10  
  11  /**
  12   * Disk Cache Handler
  13   */
  14  class diskCacheHandler implements CacheHandlerInterface
  15  {
  16      /**
  17       * Connect and initialize this handler.
  18       *
  19       * @return boolean True if successful, false on failure
  20       */
  21  	function connect()
  22      {
  23          if(!@is_writable(MYBB_ROOT."cache"))
  24          {
  25              return false;
  26          }
  27  
  28          return true;
  29      }
  30  
  31      /**
  32       * Retrieve an item from the cache.
  33       *
  34       * @param string $name The name of the cache
  35       * @return mixed Cache data if successful, false if failure
  36       */
  37  	function fetch($name)
  38      {
  39          if(!@file_exists(MYBB_ROOT."/cache/{$name}.php"))
  40          {
  41              return false;
  42          }
  43  
  44          @include(MYBB_ROOT."/cache/{$name}.php");
  45  
  46          // Return data
  47          return $$name;
  48      }
  49  
  50      /**
  51       * Write an item to the cache.
  52       *
  53       * @param string $name The name of the cache
  54       * @param mixed $contents The data to write to the cache item
  55       * @return boolean True on success, false on failure
  56       */
  57  	function put($name, $contents)
  58      {
  59          global $mybb;
  60          if(!is_writable(MYBB_ROOT."cache"))
  61          {
  62              $mybb->trigger_generic_error("cache_no_write");
  63              return false;
  64          }
  65  
  66          $cache_file = fopen(MYBB_ROOT."cache/{$name}.php", "w") or $mybb->trigger_generic_error("cache_no_write");
  67          flock($cache_file, LOCK_EX);
  68          $cache_contents = "<?php\ndeclare(encoding='UTF-8');\n\n/** MyBB Generated Cache - Do Not Alter\n * Cache Name: $name\n * Generated: ".gmdate("r")."\n*/\n\n";
  69          $cache_contents .= "\$$name = ".var_export($contents, true).";\n\n?>";
  70          fwrite($cache_file, $cache_contents);
  71          flock($cache_file, LOCK_UN);
  72          fclose($cache_file);
  73  
  74          return true;
  75      }
  76  
  77      /**
  78       * Delete a cache
  79       *
  80       * @param string $name The name of the cache
  81       * @return boolean True on success, false on failure
  82       */
  83  	function delete($name)
  84      {
  85          return @unlink(MYBB_ROOT."/cache/{$name}.php");
  86      }
  87  
  88      /**
  89       * Disconnect from the cache
  90       *
  91       * @return bool
  92       */
  93  	function disconnect()
  94      {
  95          return true;
  96      }
  97  
  98      /**
  99       * Select the size of the disk cache
 100       *
 101       * @param string $name The name of the cache
 102       * @return integer the size of the disk cache
 103       */
 104  	function size_of($name='')
 105      {
 106          if($name != '')
 107          {
 108              return @filesize(MYBB_ROOT."/cache/{$name}.php");
 109          }
 110          else
 111          {
 112              $total = 0;
 113              $dir = opendir(MYBB_ROOT."/cache");
 114              while(($file = readdir($dir)) !== false)
 115              {
 116                  if($file == "." || $file == ".." || $file == ".svn" || !is_file(MYBB_ROOT."/cache/{$file}"))
 117                  {
 118                      continue;
 119                  }
 120  
 121                  $total += filesize(MYBB_ROOT."/cache/{$file}");
 122              }
 123              return $total;
 124          }
 125      }
 126  }