thumb.php

   1 <?php
   2
   3 /**
   4  * PHP script to stream out an image thumbnail.
   5  *
   6  * @file
   7  * @ingroup Media
   8  */
   9 define( 'MW_NO_OUTPUT_COMPRESSION', 1 );
  10 require_once( './includes/WebStart.php' );
  11
  12 $wgTrivialMimeDetection = true; //don't use fancy mime detection, just check the file extension for jpg/gif/png.
  13
  14 require_once( "$IP/includes/StreamFile.php" );
  15
  16 wfThumbMain();
  17 wfLogProfilingData();
  18
  19 //--------------------------------------------------------------------------
  20
  21 function wfThumbMain() {
  22         wfProfileIn( __METHOD__ );
  23         // Get input parameters
  24         if ( get_magic_quotes_gpc() ) {
  25                 $params = array_map( 'stripslashes', $_REQUEST );
  26         } else {
  27                 $params = $_REQUEST;
  28         }
  29
  30         $fileName = isset( $params['f'] ) ? $params['f'] : '';
  31         unset( $params['f'] );
  32
  33         // Backwards compatibility parameters
  34         if ( isset( $params['w'] ) ) {
  35                 $params['width'] = $params['w'];
  36                 unset( $params['w'] );
  37         }
  38         if ( isset( $params['p'] ) ) {
  39                 $params['page'] = $params['p'];
  40         }
  41         unset( $params['r'] );
  42
  43         // Is this a thumb of an archived file?
  44         $isOld = (isset( $params['archived'] ) && $params['archived']);
  45         unset( $params['archived'] );
  46
  47         // Some basic input validation
  48         $fileName = strtr( $fileName, '\\/', '__' );
  49
  50         // Actually fetch the image. Method depends on whether it is archived or not.
  51         if( $isOld ) {
  52                 $img = RepoGroup::singleton()->getLocalRepo()->newFromArchiveName( $fileName );
  53         } else {
  54                 $img = wfLocalFile( $fileName );
  55         }
  56
  57         if ( !$img ) {
  58                 wfThumbError( 404, wfMsg( 'badtitletext' ) );
  59                 return;
  60         }
  61         if ( !$img->exists() ) {
  62                 wfThumbError( 404, 'The source file for the specified thumbnail does not exist.' );
  63                 return;
  64         }
  65         $sourcePath = $img->getPath();
  66         if ( $sourcePath === false ) {
  67                 wfThumbError( 500, 'The source file is not locally accessible.' );
  68                 return;
  69         }
  70
  71         // Check IMS against the source file
  72         // This means that clients can keep a cached copy even after it has been deleted on the server
  73         if ( !empty( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) ) {
  74                 // Fix IE brokenness
  75                 $imsString = preg_replace( '/;.*$/', '', $_SERVER["HTTP_IF_MODIFIED_SINCE"] );
  76                 // Calculate time
  77                 wfSuppressWarnings();
  78                 $imsUnix = strtotime( $imsString );
  79                 wfRestoreWarnings();
  80                 $stat = @stat( $sourcePath );
  81                 if ( $stat['mtime'] <= $imsUnix ) {
  82                         header( 'HTTP/1.1 304 Not Modified' );
  83                         return;
  84                 }
  85         }
  86
  87         // Stream the file if it exists already
  88         try {
  89                 if ( false != ( $thumbName = $img->thumbName( $params ) ) ) {
  90                         $thumbPath = $img->getThumbPath( $thumbName );
  91
  92                         if ( is_file( $thumbPath ) ) {
  93                                 wfStreamFile( $thumbPath );
  94                                 return;
  95                         }
  96                 }
  97         } catch ( MWException $e ) {
  98                 wfThumbError( 500, $e->getHTML() );
  99                 return;
 100         }
 101
 102         try {
 103                 $thumb = $img->transform( $params, File::RENDER_NOW );
 104         } catch( Exception $ex ) {
 105                 // Tried to select a page on a non-paged file?
 106                 $thumb = false;
 107         }
 108
 109         $errorMsg = false;
 110         if ( !$thumb ) {
 111                 $errorMsg = wfMsgHtml( 'thumbnail_error', 'File::transform() returned false' );
 112         } elseif ( $thumb->isError() ) {
 113                 $errorMsg = $thumb->getHtmlMsg();
 114         } elseif ( !$thumb->getPath() ) {
 115                 $errorMsg = wfMsgHtml( 'thumbnail_error', 'No path supplied in thumbnail object' );
 116         } elseif ( $thumb->getPath() == $img->getPath() ) {
 117                 $errorMsg = wfMsgHtml( 'thumbnail_error', 'Image was not scaled, ' .
 118                         'is the requested width bigger than the source?' );
 119         } else {
 120                 wfStreamFile( $thumb->getPath() );
 121         }
 122         if ( $errorMsg !== false ) {
 123                 wfThumbError( 500, $errorMsg );
 124         }
 125
 126         wfProfileOut( __METHOD__ );
 127 }
 128
 129 function wfThumbError( $status, $msg ) {
 130         global $wgShowHostnames;
 131         header( 'Cache-Control: no-cache' );
 132         header( 'Content-Type: text/html; charset=utf-8' );
 133         if ( $status == 404 ) {
 134                 header( 'HTTP/1.1 404 Not found' );
 135         } else {
 136                 header( 'HTTP/1.1 500 Internal server error' );
 137         }
 138         if( $wgShowHostnames ) {
 139                 $url = htmlspecialchars( @$_SERVER['REQUEST_URI'] );
 140                 $hostname = htmlspecialchars( wfHostname() );
 141                 $debug = "<!-- $url -->\n<!-- $hostname -->\n";
 142         } else {
 143                 $debug = "";
 144         }
 145         echo <<<EOT
 146 <html><head><title>Error generating thumbnail</title></head>
 147 <body>
 148 <h1>Error generating thumbnail</h1>
 149 <p>
 150 $msg
 151 </p>
 152 $debug
 153 </body>
 154 </html>
 155
 156 EOT;
 157 }
 158