thumb.php

   1 <?php
   2
   3 /**
   4  * PHP script to stream out an image thumbnail.
   5  *
   6  * @addtogroup Media
   7  */
   8 define( 'MW_NO_OUTPUT_COMPRESSION', 1 );
   9 require_once( './includes/WebStart.php' );
  10 wfProfileIn( 'thumb.php' );
  11 wfProfileIn( 'thumb.php-start' );
  12
  13 $wgTrivialMimeDetection = true; //don't use fancy mime detection, just check the file extension for jpg/gif/png.
  14
  15 require_once( "$IP/includes/StreamFile.php" );
  16
  17 // Get input parameters
  18 if ( get_magic_quotes_gpc() ) {
  19         $params = array_map( 'stripslashes', $_REQUEST );
  20 } else {
  21         $params = $_REQUEST;
  22 }
  23
  24 $fileName = isset( $params['f'] ) ? $params['f'] : '';
  25 unset( $params['f'] );
  26
  27 // Backwards compatibility parameters
  28 if ( isset( $params['w'] ) ) {
  29         $params['width'] = $params['w'];
  30         unset( $params['w'] );
  31 }
  32 if ( isset( $params['p'] ) ) {
  33         $params['page'] = $params['p'];
  34 }
  35 unset( $params['r'] );
  36
  37 // Some basic input validation
  38 $fileName = strtr( $fileName, '\\/', '__' );
  39
  40 // Stream the file if it exists already
  41 try {
  42         $img = wfLocalFile( $fileName );
  43         if ( $img && false != ( $thumbName = $img->thumbName( $params ) ) ) {
  44                 $thumbPath = $img->getThumbPath( $thumbName );
  45
  46                 if ( is_file( $thumbPath ) ) {
  47                         wfStreamFile( $thumbPath );
  48                         wfLogProfilingData();
  49                         exit;
  50                 }
  51         }
  52 } catch ( MWException $e ) {
  53         thumbInternalError( $e->getHTML() );
  54         wfLogProfilingData();
  55         exit;
  56 }
  57
  58 wfProfileOut( 'thumb.php-start' );
  59 wfProfileIn( 'thumb.php-render' );
  60
  61 try {
  62         if ( $img ) {
  63                 $thumb = $img->transform( $params, File::RENDER_NOW );
  64         } else {
  65                 $thumb = false;
  66         }
  67 } catch( Exception $ex ) {
  68         // Tried to select a page on a non-paged file?
  69         $thumb = false;
  70 }
  71
  72 $errorMsg = false;
  73 if ( !$img ) {
  74         $errorMsg = wfMsg( 'badtitletext' );
  75 } elseif ( !$thumb ) {
  76         $errorMsg = wfMsgHtml( 'thumbnail_error', 'File::transform() returned false' );
  77 } elseif ( $thumb->isError() ) {
  78         $errorMsg = $thumb->getHtmlMsg();
  79 } elseif ( !$thumb->getPath() ) {
  80         $errorMsg = wfMsgHtml( 'thumbnail_error', 'No path supplied in thumbnail object' );
  81 } elseif ( $thumb->getPath() == $img->getPath() ) {
  82         $errorMsg = wfMsgHtml( 'thumbnail_error', 'Image was not scaled, ' .
  83                 'is the requested width bigger than the source?' );
  84 } else {
  85         wfStreamFile( $thumb->getPath() );
  86 }
  87 if ( $errorMsg !== false ) {
  88         thumbInternalError( $errorMsg );
  89 }
  90
  91 wfProfileOut( 'thumb.php-render' );
  92 wfProfileOut( 'thumb.php' );
  93 wfLogProfilingData();
  94
  95 //--------------------------------------------------------------------------
  96
  97 function thumbInternalError( $msg ) {
  98         header( 'Cache-Control: no-cache' );
  99         header( 'Content-Type: text/html; charset=utf-8' );
 100         header( 'HTTP/1.1 500 Internal server error' );
 101         echo <<<EOT
 102 <html><head><title>Error generating thumbnail</title></head>
 103 <body>
 104 <h1>Error generating thumbnail</h1>
 105 <p>
 106 $msg
 107 </p>
 108 </body>
 109 </html>
 110
 111 EOT;
 112 }
 113
 114