thumb.php

   1 <?php
   2
   3 /**
   4  * PHP script to stream out an image thumbnail.
   5  * If the file exists, we make do with abridged MediaWiki initialisation.
   6  */
   7 define( 'MW_NO_SETUP', 1 );
   8 define( 'MW_NO_OUTPUT_COMPRESSION', 1 );
   9 require_once( './includes/WebStart.php' );
  10 wfProfileIn( 'thumb.php' );
  11 wfProfileIn( 'thumb.php-start' );
  12 require_once( "$IP/includes/GlobalFunctions.php" );
  13 require_once( "$IP/includes/ImageFunctions.php" );
  14
  15 $wgTrivialMimeDetection = true; //don't use fancy mime detection, just check the file extension for jpg/gif/png.
  16
  17 require_once( "$IP/includes/StreamFile.php" );
  18 require_once( "$IP/includes/AutoLoader.php" );
  19
  20 // Get input parameters
  21 if ( get_magic_quotes_gpc() ) {
  22         $params = array_map( 'stripslashes', $_REQUEST );
  23 } else {
  24         $params = $_REQUEST;
  25 }
  26
  27 $fileName = isset( $params['f'] ) ? $params['f'] : '';
  28 unset( $params['f'] );
  29
  30 // Backwards compatibility parameters
  31 if ( isset( $params['w'] ) ) {
  32         $params['width'] = $params['w'];
  33         unset( $params['w'] );
  34 }
  35 if ( isset( $params['p'] ) ) {
  36         $params['page'] = $params['p'];
  37 }
  38 unset( $params['r'] );
  39
  40 // Some basic input validation
  41 $fileName = strtr( $fileName, '\\/', '__' );
  42
  43 // Work out paths, carefully avoiding constructing an Image object because that won't work yet
  44 $handler = thumbGetHandler( $fileName );
  45 if ( $handler ) {
  46         $imagePath = wfImageDir( $fileName ) . '/' . $fileName;
  47         $thumbName = $handler->makeParamString( $params ) . "-$fileName";
  48         $thumbPath = wfImageThumbDir( $fileName ) . '/' . $thumbName;
  49
  50         if ( is_file( $thumbPath ) && filemtime( $thumbPath ) >= filemtime( $imagePath ) ) {
  51                 wfStreamFile( $thumbPath );
  52                 // Can't log profiling data with no Setup.php
  53                 exit;
  54         }
  55 }
  56
  57 // OK, no valid thumbnail, time to get out the heavy machinery
  58 wfProfileOut( 'thumb.php-start' );
  59 require_once( './includes/Setup.php' );
  60 wfProfileIn( 'thumb.php-render' );
  61
  62 $img = Image::newFromName( $fileName );
  63 try {
  64         if ( $img ) {
  65                 $thumb = $img->transform( $params, Image::RENDER_NOW );
  66         } else {
  67                 $thumb = false;
  68         }
  69 } catch( Exception $ex ) {
  70         // Tried to select a page on a non-paged file?
  71         $thumb = false;
  72 }
  73
  74 if ( $thumb && $thumb->getPath() ) {
  75         wfStreamFile( $thumb->getPath() );
  76 } elseif ( $img ) {
  77         header( 'Cache-Control: no-cache' );
  78         header( 'Content-Type: text/html; charset=utf-8' );
  79         header( 'HTTP/1.1 500 Internal server error' );
  80         if ( !$thumb ) {
  81                 $msg = wfMsgHtml( 'thumbnail_error', 'Image::transform() returned false' );
  82         } elseif ( $thumb->isError() ) {
  83                 $msg = $thumb->toHtml();
  84         } else {
  85                 $msg = wfMsgHtml( 'thumbnail_error', 'No path supplied in thumbnail object' );
  86         }
  87         echo <<<EOT
  88 <html><head><title>Error generating thumbnail</title></head>
  89 <body>
  90 $msg
  91 </body>
  92 </html>
  93
  94 EOT;
  95 } else {
  96         $badtitle = wfMsg( 'badtitle' );
  97         $badtitletext = wfMsg( 'badtitletext' );
  98         header( 'Cache-Control: no-cache' );
  99         header( 'Content-Type: text/html; charset=utf-8' );
 100         header( 'HTTP/1.1 500 Internal server error' );
 101         echo "<html><head>
 102         <title>$badtitle</title>
 103         <body>
 104 <h1>$badtitle</h1>
 105 <p>$badtitletext</p>
 106 </body></html>
 107 ";
 108 }
 109
 110 wfProfileOut( 'thumb.php-render' );
 111 wfProfileOut( 'thumb.php' );
 112 wfLogProfilingData();
 113
 114 //--------------------------------------------------------------------------
 115
 116 function thumbGetHandler( $fileName ) {
 117         // Determine type
 118         $magic = MimeMagic::singleton();
 119         $extPos = strrpos( $fileName, '.' );
 120         if ( $extPos === false ) {
 121                 return false;
 122         }
 123         $mime = $magic->guessTypesForExtension( substr( $fileName, $extPos + 1 ) );
 124         return MediaHandler::getHandler( $mime );
 125 }
 126
 127 ?>