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 try {
  45         $handler = thumbGetHandler( $fileName );
  46         if ( $handler ) {
  47                 $imagePath = wfImageDir( $fileName ) . '/' . $fileName;
  48                 $thumbName = $handler->makeParamString( $params ) . "-$fileName";
  49                 $thumbPath = wfImageThumbDir( $fileName ) . '/' . $thumbName;
  50
  51                 if ( is_file( $thumbPath ) && filemtime( $thumbPath ) >= filemtime( $imagePath ) ) {
  52                         wfStreamFile( $thumbPath );
  53                         // Can't log profiling data with no Setup.php
  54                         exit;
  55                 }
  56         }
  57 } catch ( MWException $e ) {
  58         require_once( './includes/Setup.php' );
  59         thumbInternalError( $e->getHTML() );
  60         exit;
  61 }
  62
  63
  64 // OK, no valid thumbnail, time to get out the heavy machinery
  65 wfProfileOut( 'thumb.php-start' );
  66 require_once( './includes/Setup.php' );
  67 wfProfileIn( 'thumb.php-render' );
  68
  69 $img = Image::newFromName( $fileName );
  70 try {
  71         if ( $img ) {
  72                 $thumb = $img->transform( $params, Image::RENDER_NOW );
  73         } else {
  74                 $thumb = false;
  75         }
  76 } catch( Exception $ex ) {
  77         // Tried to select a page on a non-paged file?
  78         $thumb = false;
  79 }
  80
  81 if ( $thumb && $thumb->getPath() && file_exists( $thumb->getPath() ) ) {
  82         wfStreamFile( $thumb->getPath() );
  83 } elseif ( $img ) {
  84         if ( !$thumb ) {
  85                 $msg = wfMsgHtml( 'thumbnail_error', 'Image::transform() returned false' );
  86         } elseif ( $thumb->isError() ) {
  87                 $msg = $thumb->getHtmlMsg();
  88         } elseif ( !$thumb->getPath() ) {
  89                 $msg = wfMsgHtml( 'thumbnail_error', 'No path supplied in thumbnail object' );
  90         } else {
  91                 $msg = wfMsgHtml( 'thumbnail_error', 'Output file missing' );
  92         }
  93         thumbInternalError( $msg );
  94 } else {
  95         $badtitle = wfMsg( 'badtitle' );
  96         $badtitletext = wfMsg( 'badtitletext' );
  97         header( 'Cache-Control: no-cache' );
  98         header( 'Content-Type: text/html; charset=utf-8' );
  99         header( 'HTTP/1.1 500 Internal server error' );
 100         echo "<html><head>
 101         <title>$badtitle</title>
 102         <body>
 103 <h1>$badtitle</h1>
 104 <p>$badtitletext</p>
 105 </body></html>
 106 ";
 107 }
 108
 109 wfProfileOut( 'thumb.php-render' );
 110 wfProfileOut( 'thumb.php' );
 111 wfLogProfilingData();
 112
 113 //--------------------------------------------------------------------------
 114
 115 function thumbGetHandler( $fileName ) {
 116         // Determine type
 117         $magic = MimeMagic::singleton();
 118         $extPos = strrpos( $fileName, '.' );
 119         if ( $extPos === false ) {
 120                 return false;
 121         }
 122         $mime = $magic->guessTypesForExtension( substr( $fileName, $extPos + 1 ) );
 123         return MediaHandler::getHandler( $mime );
 124 }
 125
 126 function thumbInternalError( $msg ) {
 127         header( 'Cache-Control: no-cache' );
 128         header( 'Content-Type: text/html; charset=utf-8' );
 129         header( 'HTTP/1.1 500 Internal server error' );
 130         echo <<<EOT
 131 <html><head><title>Error generating thumbnail</title></head>
 132 <body>
 133 <h1>Error generating thumbnail</h1>
 134 <p>
 135 $msg
 136 </p>
 137 </body>
 138 </html>
 139
 140 EOT;
 141 }
 142
 143 ?>