thumb.php

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