! $bits = explode( '!', $fileName, 2 ); if ( count( $bits ) != 2 ) { wfThumbError( 404, wfMsg( 'badtitletext' ) ); wfProfileOut( __METHOD__ ); return; } $title = Title::makeTitleSafe( NS_FILE, $bits[1] ); if ( !$title ) { wfThumbError( 404, wfMsg( 'badtitletext' ) ); wfProfileOut( __METHOD__ ); return; } $img = RepoGroup::singleton()->getLocalRepo()->newFromArchiveName( $title, $fileName ); } else { $img = wfLocalFile( $fileName ); } // Check permissions if there are read restrictions if ( !in_array( 'read', User::getGroupPermissions( array( '*' ) ), true ) ) { if ( !$img->getTitle()->userCan( 'read' ) ) { wfThumbError( 403, 'Access denied. You do not have permission to access ' . 'the source file.' ); wfProfileOut( __METHOD__ ); return; } $headers[] = 'Cache-Control: private'; $headers[] = 'Vary: Cookie'; } // Check the source file storage path if ( !$img ) { wfThumbError( 404, wfMsg( 'badtitletext' ) ); wfProfileOut( __METHOD__ ); return; } if ( !$img->exists() ) { wfThumbError( 404, 'The source file for the specified thumbnail does not exist.' ); wfProfileOut( __METHOD__ ); return; } $sourcePath = $img->getPath(); if ( $sourcePath === false ) { wfThumbError( 500, 'The source file is not locally accessible.' ); wfProfileOut( __METHOD__ ); return; } // Check IMS against the source file // This means that clients can keep a cached copy even after it has been deleted on the server if ( !empty( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) ) { // Fix IE brokenness $imsString = preg_replace( '/;.*$/', '', $_SERVER["HTTP_IF_MODIFIED_SINCE"] ); // Calculate time wfSuppressWarnings(); $imsUnix = strtotime( $imsString ); wfRestoreWarnings(); $sourceTsUnix = wfTimestamp( TS_UNIX, $img->getTimestamp() ); if ( $sourceTsUnix <= $imsUnix ) { header( 'HTTP/1.1 304 Not Modified' ); wfProfileOut( __METHOD__ ); return; } } // Stream the file if it exists already... try { $thumbName = $img->thumbName( $params ); if ( strlen( $thumbName ) ) { // valid params? // For 404 handled thumbnails, we only use the the base name of the URI // for the thumb params and the parent directory for the source file name. // Check that the zone relative path matches up so squid caches won't pick // up thumbs that would not be purged on source file deletion (bug 34231). if ( isset( $params['rel404'] ) // thumbnail was handled via 404 && urldecode( $params['rel404'] ) !== $img->getThumbRel( $thumbName ) ) { wfThumbError( 404, 'The source file for the specified thumbnail does not exist.' ); wfProfileOut( __METHOD__ ); return; } $thumbPath = $img->getThumbPath( $thumbName ); if ( $img->getRepo()->fileExists( $thumbPath ) ) { $img->getRepo()->streamFile( $thumbPath, $headers ); wfProfileOut( __METHOD__ ); return; } } } catch ( MWException $e ) { wfThumbError( 500, $e->getHTML() ); wfProfileOut( __METHOD__ ); return; } // Thumbnail isn't already there, so create the new thumbnail... try { $thumb = $img->transform( $params, File::RENDER_NOW ); } catch ( Exception $ex ) { // Tried to select a page on a non-paged file? $thumb = false; } // Check for thumbnail generation errors... $errorMsg = false; if ( !$thumb ) { $errorMsg = wfMsgHtml( 'thumbnail_error', 'File::transform() returned false' ); } elseif ( $thumb->isError() ) { $errorMsg = $thumb->getHtmlMsg(); } elseif ( !$thumb->hasFile() ) { $errorMsg = wfMsgHtml( 'thumbnail_error', 'No path supplied in thumbnail object' ); } elseif ( $thumb->fileIsSource() ) { $errorMsg = wfMsgHtml( 'thumbnail_error', 'Image was not scaled, is the requested width bigger than the source?' ); } if ( $errorMsg !== false ) { wfThumbError( 500, $errorMsg ); } else { // Stream the file if there were no errors $thumb->streamFile( $headers ); } wfProfileOut( __METHOD__ ); } /** * Extract the required params for thumb.php from the thumbnail request URI. * At least 'width' and 'f' should be set if the result is an array. * * @param $uri String Thumbnail request URI path * @return Array|null associative params array or null */ function wfExtractThumbParams( $uri ) { $repo = RepoGroup::singleton()->getLocalRepo(); $zoneURI = $repo->getZoneUrl( 'thumb' ); if ( substr( $zoneURI, 0, 1 ) !== '/' ) { $bits = wfParseUrl( $zoneURI ); if ( $bits && isset( $bits['path'] ) ) { $zoneURI = $bits['path']; } else { return null; } } $zoneUrlRegex = preg_quote( $zoneURI ); $hashDirRegex = $subdirRegex = ''; for ( $i = 0; $i < $repo->getHashLevels(); $i++ ) { $subdirRegex .= '[0-9a-f]'; $hashDirRegex .= "$subdirRegex/"; } $thumbUrlRegex = "!^$zoneUrlRegex/((archive/|temp/)?$hashDirRegex([^/]*)/([^/]*))$!"; // Check if this is a valid looking thumbnail request... if ( preg_match( $thumbUrlRegex, $uri, $matches ) ) { list( /* all */, $rel, $archOrTemp, $filename, $thumbname ) = $matches; $filename = urldecode( $filename ); $thumbname = urldecode( $thumbname ); $params = array( 'f' => $filename, 'rel404' => $rel ); if ( $archOrTemp == 'archive/' ) { $params['archived'] = 1; } elseif ( $archOrTemp == 'temp/' ) { $params['temp'] = 1; } // Check if the parameters can be extracted from the thumbnail name... if ( preg_match( '!^(page(\d*)-)*(\d*)px-[^/]*$!', $thumbname, $matches ) ) { list( /* all */, $pagefull, $pagenum, $size ) = $matches; $params['width'] = $size; if ( $pagenum ) { $params['page'] = $pagenum; } return $params; // valid thumbnail URL // Hooks return false if they manage to *resolve* the parameters } elseif ( !wfRunHooks( 'ExtractThumbParameters', array( $thumbname, &$params ) ) ) { return $params; // valid thumbnail URL (via extension or config) } } return null; // not a valid thumbnail URL } /** * Output a thumbnail generation error message * * @param $status integer * @param $msg string * @return void */ function wfThumbError( $status, $msg ) { global $wgShowHostnames; header( 'Cache-Control: no-cache' ); header( 'Content-Type: text/html; charset=utf-8' ); if ( $status == 404 ) { header( 'HTTP/1.1 404 Not found' ); } elseif ( $status == 403 ) { header( 'HTTP/1.1 403 Forbidden' ); header( 'Vary: Cookie' ); } else { header( 'HTTP/1.1 500 Internal server error' ); } if ( $wgShowHostnames ) { $url = htmlspecialchars( isset( $_SERVER['REQUEST_URI'] ) ? $_SERVER['REQUEST_URI'] : '' ); $hostname = htmlspecialchars( wfHostname() ); $debug = "\n\n"; } else { $debug = ""; } echo <<Error generating thumbnail

Error generating thumbnail

$msg

$debug EOT; }