system/helpers/download_helper.php

   1 <?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
   2 /**
   3  * CodeIgniter
   4  *
   5  * An open source application development framework for PHP 5.1.6 or newer
   6  *
   7  * @package             CodeIgniter
   8  * @author              ExpressionEngine Dev Team
   9  * @copyright   Copyright (c) 2008 - 2011, EllisLab, Inc.
  10  * @license             http://codeigniter.com/user_guide/license.html
  11  * @link                http://codeigniter.com
  12  * @since               Version 1.0
  13  * @filesource
  14  */
  15
  16 // ------------------------------------------------------------------------
  17
  18 /**
  19  * CodeIgniter Download Helpers
  20  *
  21  * @package             CodeIgniter
  22  * @subpackage  Helpers
  23  * @category    Helpers
  24  * @author              ExpressionEngine Dev Team
  25  * @link                http://codeigniter.com/user_guide/helpers/download_helper.html
  26  */
  27
  28 // ------------------------------------------------------------------------
  29
  30 /**
  31  * Force Download
  32  *
  33  * Generates headers that force a download to happen
  34  *
  35  * @access      public
  36  * @param       string  filename
  37  * @param       mixed   the data to be downloaded
  38  * @return      void
  39  */
  40 if ( ! function_exists('force_download'))
  41 {
  42         function force_download($filename = '', $data = '')
  43         {
  44                 if ($filename == '' OR $data == '')
  45                 {
  46                         return FALSE;
  47                 }
  48
  49                 // Try to determine if the filename includes a file extension.
  50                 // We need it in order to set the MIME type
  51                 if (FALSE === strpos($filename, '.'))
  52                 {
  53                         return FALSE;
  54                 }
  55
  56                 // Grab the file extension
  57                 $x = explode('.', $filename);
  58                 $extension = end($x);
  59
  60                 // Load the mime types
  61                 if (defined('ENVIRONMENT') AND is_file(APPPATH.'config/'.ENVIRONMENT.'/mimes'.EXT))
  62                 {
  63                         include(APPPATH.'config/'.ENVIRONMENT.'/mimes'.EXT);
  64                 }
  65                 elseif (is_file(APPPATH.'config/mimes'.EXT))
  66                 {
  67                         include(APPPATH.'config/mimes'.EXT);
  68                 }
  69
  70                 // Set a default mime if we can't find it
  71                 if ( ! isset($mimes[$extension]))
  72                 {
  73                         $mime = 'application/octet-stream';
  74                 }
  75                 else
  76                 {
  77                         $mime = (is_array($mimes[$extension])) ? $mimes[$extension][0] : $mimes[$extension];
  78                 }
  79
  80                 // Generate the server headers
  81                 if (strpos($_SERVER['HTTP_USER_AGENT'], "MSIE") !== FALSE)
  82                 {
  83                         header('Content-Type: "'.$mime.'"');
  84                         header('Content-Disposition: attachment; filename="'.$filename.'"');
  85                         header('Expires: 0');
  86                         header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
  87                         header("Content-Transfer-Encoding: binary");
  88                         header('Pragma: public');
  89                         header("Content-Length: ".strlen($data));
  90                 }
  91                 else
  92                 {
  93                         header('Content-Type: "'.$mime.'"');
  94                         header('Content-Disposition: attachment; filename="'.$filename.'"');
  95                         header("Content-Transfer-Encoding: binary");
  96                         header('Expires: 0');
  97                         header('Pragma: no-cache');
  98                         header("Content-Length: ".strlen($data));
  99                 }
 100
 101                 exit($data);
 102         }
 103 }
 104
 105
 106 /* End of file download_helper.php */
 107 /* Location: ./system/helpers/download_helper.php */