doPostOutputShutdown( 'fast' ); //-------------------------------------------------------------------------- /** * Handle a thumbnail request via thumbnail file URL * * @return void */ function wfThumbHandle404() { global $wgArticlePath; # Set action base paths so that WebRequest::getPathInfo() # recognizes the "X" as the 'title' in ../thumb_handler.php/X urls. # Note: If Custom per-extension repo paths are set, this may break. $repo = RepoGroup::singleton()->getLocalRepo(); $oldArticlePath = $wgArticlePath; $wgArticlePath = $repo->getZoneUrl( 'thumb' ) . '/$1'; $matches = WebRequest::getPathInfo(); $wgArticlePath = $oldArticlePath; if ( !isset( $matches['title'] ) ) { wfThumbError( 404, 'Could not determine the name of the requested thumbnail.' ); return; } $params = wfExtractThumbRequestInfo( $matches['title'] ); // basic wiki URL param extracting if ( $params == null ) { wfThumbError( 400, 'The specified thumbnail parameters are not recognized.' ); return; } wfStreamThumb( $params ); // stream the thumbnail } /** * Stream a thumbnail specified by parameters * * @param array $params List of thumbnailing parameters. In addition to parameters * passed to the MediaHandler, this may also includes the keys: * f (for filename), archived (if archived file), temp (if temp file), * w (alias for width), p (alias for page), r (ignored; historical), * rel404 (path for render on 404 to verify hash path correct), * thumbName (thumbnail name to potentially extract more parameters from * e.g. 'lossy-page1-120px-Foo.tiff' would add page, lossy and width * to the parameters) * @return void */ function wfStreamThumb( array $params ) { global $wgVaryOnXFP; $headers = array(); // HTTP headers to send $fileName = isset( $params['f'] ) ? $params['f'] : ''; // Backwards compatibility parameters if ( isset( $params['w'] ) ) { $params['width'] = $params['w']; unset( $params['w'] ); } if ( isset( $params['width'] ) && substr( $params['width'], -2 ) == 'px' ) { // strip the px (pixel) suffix, if found $params['width'] = substr( $params['width'], 0, -2 ); } if ( isset( $params['p'] ) ) { $params['page'] = $params['p']; } // Is this a thumb of an archived file? $isOld = ( isset( $params['archived'] ) && $params['archived'] ); unset( $params['archived'] ); // handlers don't care // Is this a thumb of a temp file? $isTemp = ( isset( $params['temp'] ) && $params['temp'] ); unset( $params['temp'] ); // handlers don't care // Some basic input validation $fileName = strtr( $fileName, '\\/', '__' ); // Actually fetch the image. Method depends on whether it is archived or not. if ( $isTemp ) { $repo = RepoGroup::singleton()->getLocalRepo()->getTempRepo(); $img = new UnregisteredLocalFile( null, $repo, # Temp files are hashed based on the name without the timestamp. # The thumbnails will be hashed based on the entire name however. # @todo fix this convention to actually be reasonable. $repo->getZonePath( 'public' ) . '/' . $repo->getTempHashPath( $fileName ) . $fileName ); } elseif ( $isOld ) { // Format is ! $bits = explode( '!', $fileName, 2 ); if ( count( $bits ) != 2 ) { wfThumbError( 404, wfMessage( 'badtitletext' )->parse() ); return; } $title = Title::makeTitleSafe( NS_FILE, $bits[1] ); if ( !$title ) { wfThumbError( 404, wfMessage( 'badtitletext' )->parse() ); return; } $img = RepoGroup::singleton()->getLocalRepo()->newFromArchiveName( $title, $fileName ); } else { $img = wfLocalFile( $fileName ); } // Check the source file title if ( !$img ) { wfThumbError( 404, wfMessage( 'badtitletext' )->parse() ); return; } // Check permissions if there are read restrictions $varyHeader = array(); if ( !in_array( 'read', User::getGroupPermissions( array( '*' ) ), true ) ) { if ( !$img->getTitle() || !$img->getTitle()->userCan( 'read' ) ) { wfThumbError( 403, 'Access denied. You do not have permission to access ' . 'the source file.' ); return; } $headers[] = 'Cache-Control: private'; $varyHeader[] = 'Cookie'; } // Check if the file is hidden if ( $img->isDeleted( File::DELETED_FILE ) ) { wfThumbErrorText( 404, "The source file '$fileName' does not exist." ); return; } // Do rendering parameters extraction from thumbnail name. if ( isset( $params['thumbName'] ) ) { $params = wfExtractThumbParams( $img, $params ); } if ( $params == null ) { wfThumbError( 400, 'The specified thumbnail parameters are not recognized.' ); return; } // Check the source file storage path if ( !$img->exists() ) { $redirectedLocation = false; if ( !$isTemp ) { // Check for file redirect // Since redirects are associated with pages, not versions of files, // we look for the most current version to see if its a redirect. $possRedirFile = RepoGroup::singleton()->getLocalRepo()->findFile( $img->getName() ); if ( $possRedirFile && !is_null( $possRedirFile->getRedirected() ) ) { $redirTarget = $possRedirFile->getName(); $targetFile = wfLocalFile( Title::makeTitleSafe( NS_FILE, $redirTarget ) ); if ( $targetFile->exists() ) { $newThumbName = $targetFile->thumbName( $params ); if ( $isOld ) { /** @var array $bits */ $newThumbUrl = $targetFile->getArchiveThumbUrl( $bits[0] . '!' . $targetFile->getName(), $newThumbName ); } else { $newThumbUrl = $targetFile->getThumbUrl( $newThumbName ); } $redirectedLocation = wfExpandUrl( $newThumbUrl, PROTO_CURRENT ); } } } if ( $redirectedLocation ) { // File has been moved. Give redirect. $response = RequestContext::getMain()->getRequest()->response(); $response->statusHeader( 302 ); $response->header( 'Location: ' . $redirectedLocation ); $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', time() + 12 * 3600 ) . ' GMT' ); if ( $wgVaryOnXFP ) { $varyHeader[] = 'X-Forwarded-Proto'; } if ( count( $varyHeader ) ) { $response->header( 'Vary: ' . implode( ', ', $varyHeader ) ); } $response->header( 'Content-Length: 0' ); return; } // If its not a redirect that has a target as a local file, give 404. wfThumbErrorText( 404, "The source file '$fileName' does not exist." ); return; } elseif ( $img->getPath() === false ) { wfThumbErrorText( 400, "The source file '$fileName' is not locally accessible." ); 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 MediaWiki\suppressWarnings(); $imsUnix = strtotime( $imsString ); MediaWiki\restoreWarnings(); if ( wfTimestamp( TS_UNIX, $img->getTimestamp() ) <= $imsUnix ) { HttpStatus::header( 304 ); return; } } $rel404 = isset( $params['rel404'] ) ? $params['rel404'] : null; unset( $params['r'] ); // ignore 'r' because we unconditionally pass File::RENDER unset( $params['f'] ); // We're done with 'f' parameter. unset( $params['rel404'] ); // moved to $rel404 // Get the normalized thumbnail name from the parameters... try { $thumbName = $img->thumbName( $params ); if ( !strlen( $thumbName ) ) { // invalid params? throw new MediaTransformInvalidParametersException( 'Empty return from File::thumbName' ); } $thumbName2 = $img->thumbName( $params, File::THUMB_FULL_NAME ); // b/c; "long" style } catch ( MediaTransformInvalidParametersException $e ) { wfThumbError( 400, 'The specified thumbnail parameters are not valid: ' . $e->getMessage() ); return; } catch ( MWException $e ) { wfThumbError( 500, $e->getHTML() ); return; } // For 404 handled thumbnails, we only use 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 ( $rel404 !== null ) { // thumbnail was handled via 404 if ( rawurldecode( $rel404 ) === $img->getThumbRel( $thumbName ) ) { // Request for the canonical thumbnail name } elseif ( rawurldecode( $rel404 ) === $img->getThumbRel( $thumbName2 ) ) { // Request for the "long" thumbnail name; redirect to canonical name $response = RequestContext::getMain()->getRequest()->response(); $response->statusHeader( 301 ); $response->header( 'Location: ' . wfExpandUrl( $img->getThumbUrl( $thumbName ), PROTO_CURRENT ) ); $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', time() + 7 * 86400 ) . ' GMT' ); if ( $wgVaryOnXFP ) { $varyHeader[] = 'X-Forwarded-Proto'; } if ( count( $varyHeader ) ) { $response->header( 'Vary: ' . implode( ', ', $varyHeader ) ); } return; } else { wfThumbErrorText( 404, "The given path of the specified thumbnail is incorrect; expected '" . $img->getThumbRel( $thumbName ) . "' but got '" . rawurldecode( $rel404 ) . "'." ); return; } } $dispositionType = isset( $params['download'] ) ? 'attachment' : 'inline'; // Suggest a good name for users downloading this thumbnail $headers[] = "Content-Disposition: {$img->getThumbDisposition( $thumbName, $dispositionType )}"; if ( count( $varyHeader ) ) { $headers[] = 'Vary: ' . implode( ', ', $varyHeader ); } // Stream the file if it exists already... $thumbPath = $img->getThumbPath( $thumbName ); if ( $img->getRepo()->fileExists( $thumbPath ) ) { $starttime = microtime( true ); $success = $img->getRepo()->streamFile( $thumbPath, $headers ); $streamtime = microtime( true ) - $starttime; if ( !$success ) { wfThumbError( 500, 'Could not stream the file' ); } else { RequestContext::getMain()->getStats()->timing( 'media.thumbnail.stream', $streamtime ); } return; } $user = RequestContext::getMain()->getUser(); if ( !wfThumbIsStandard( $img, $params ) && $user->pingLimiter( 'renderfile-nonstandard' ) ) { wfThumbError( 429, wfMessage( 'actionthrottledtext' )->parse() ); return; } elseif ( $user->pingLimiter( 'renderfile' ) ) { wfThumbError( 429, wfMessage( 'actionthrottledtext' )->parse() ); return; } list( $thumb, $errorMsg ) = wfGenerateThumbnail( $img, $params, $thumbName, $thumbPath ); /** @var MediaTransformOutput|MediaTransformError|bool $thumb */ // Check for thumbnail generation errors... $msg = wfMessage( 'thumbnail_error' ); $errorCode = 500; if ( !$thumb ) { $errorMsg = $errorMsg ?: $msg->rawParams( 'File::transform() returned false' )->escaped(); if ( $errorMsg instanceof MessageSpecifier && $errorMsg->getKey() === 'thumbnail_image-failure-limit' ) { $errorCode = 429; } } elseif ( $thumb->isError() ) { $errorMsg = $thumb->getHtmlMsg(); } elseif ( !$thumb->hasFile() ) { $errorMsg = $msg->rawParams( 'No path supplied in thumbnail object' )->escaped(); } elseif ( $thumb->fileIsSource() ) { $errorMsg = $msg-> rawParams( 'Image was not scaled, is the requested width bigger than the source?' )->escaped(); $errorCode = 400; } if ( $errorMsg !== false ) { wfThumbError( $errorCode, $errorMsg ); } else { // Stream the file if there were no errors $success = $thumb->streamFile( $headers ); if ( !$success ) { wfThumbError( 500, 'Could not stream the file' ); } } } /** * Actually try to generate a new thumbnail * * @param File $file * @param array $params * @param string $thumbName * @param string $thumbPath * @return array (MediaTransformOutput|bool, string|bool error message HTML) */ function wfGenerateThumbnail( File $file, array $params, $thumbName, $thumbPath ) { global $wgMemc, $wgAttemptFailureEpoch; $key = wfMemcKey( 'attempt-failures', $wgAttemptFailureEpoch, $file->getRepo()->getName(), $file->getSha1(), md5( $thumbName ) ); // Check if this file keeps failing to render if ( $wgMemc->get( $key ) >= 4 ) { return array( false, wfMessage( 'thumbnail_image-failure-limit', 4 ) ); } $done = false; // Record failures on PHP fatals in addition to caching exceptions register_shutdown_function( function () use ( &$done, $key ) { if ( !$done ) { // transform() gave a fatal global $wgMemc; // Randomize TTL to reduce stampedes $wgMemc->incrWithInit( $key, 3600 + mt_rand( 0, 300 ) ); } } ); $thumb = false; $errorHtml = false; // guard thumbnail rendering with PoolCounter to avoid stampedes // expensive files use a separate PoolCounter config so it is possible // to set up a global limit on them if ( $file->isExpensiveToThumbnail() ) { $poolCounterType = 'FileRenderExpensive'; } else { $poolCounterType = 'FileRender'; } // Thumbnail isn't already there, so create the new thumbnail... try { $work = new PoolCounterWorkViaCallback( $poolCounterType, sha1( $file->getName() ), array( 'doWork' => function () use ( $file, $params ) { return $file->transform( $params, File::RENDER_NOW ); }, 'getCachedWork' => function () use ( $file, $params, $thumbPath ) { // If the worker that finished made this thumbnail then use it. // Otherwise, it probably made a different thumbnail for this file. return $file->getRepo()->fileExists( $thumbPath ) ? $file->transform( $params, File::RENDER_NOW ) : false; // retry once more in exclusive mode }, 'fallback' => function () { return wfMessage( 'generic-pool-error' )->parse(); }, 'error' => function ( Status $status ) { return $status->getHTML(); } ) ); $result = $work->execute(); if ( $result instanceof MediaTransformOutput ) { $thumb = $result; } elseif ( is_string( $result ) ) { // error $errorHtml = $result; } } catch ( Exception $e ) { // Tried to select a page on a non-paged file? } /** @noinspection PhpUnusedLocalVariableInspection */ $done = true; // no PHP fatal occured if ( !$thumb || $thumb->isError() ) { // Randomize TTL to reduce stampedes $wgMemc->incrWithInit( $key, 3600 + mt_rand( 0, 300 ) ); } return array( $thumb, $errorHtml ); } /** * Convert pathinfo type parameter, into normal request parameters * * So for example, if the request was redirected from * /w/images/thumb/a/ab/Foo.png/120px-Foo.png. The $thumbRel parameter * of this function would be set to "a/ab/Foo.png/120px-Foo.png". * This method is responsible for turning that into an array * with the folowing keys: * * f => the filename (Foo.png) * * rel404 => the whole thing (a/ab/Foo.png/120px-Foo.png) * * archived => 1 (If the request is for an archived thumb) * * temp => 1 (If the file is in the "temporary" zone) * * thumbName => the thumbnail name, including parameters (120px-Foo.png) * * Transform specific parameters are set later via wfExtractThumbParams(). * * @param string $thumbRel Thumbnail path relative to the thumb zone * @return array|null Associative params array or null */ function wfExtractThumbRequestInfo( $thumbRel ) { $repo = RepoGroup::singleton()->getLocalRepo(); $hashDirReg = $subdirReg = ''; $hashLevels = $repo->getHashLevels(); for ( $i = 0; $i < $hashLevels; $i++ ) { $subdirReg .= '[0-9a-f]'; $hashDirReg .= "$subdirReg/"; } // Check if this is a thumbnail of an original in the local file repo if ( preg_match( "!^((archive/)?$hashDirReg([^/]*)/([^/]*))$!", $thumbRel, $m ) ) { list( /*all*/, $rel, $archOrTemp, $filename, $thumbname ) = $m; // Check if this is a thumbnail of an temp file in the local file repo } elseif ( preg_match( "!^(temp/)($hashDirReg([^/]*)/([^/]*))$!", $thumbRel, $m ) ) { list( /*all*/, $archOrTemp, $rel, $filename, $thumbname ) = $m; } else { return null; // not a valid looking thumbnail request } $params = array( 'f' => $filename, 'rel404' => $rel ); if ( $archOrTemp === 'archive/' ) { $params['archived'] = 1; } elseif ( $archOrTemp === 'temp/' ) { $params['temp'] = 1; } $params['thumbName'] = $thumbname; return $params; } /** * Convert a thumbnail name (122px-foo.png) to parameters, using * file handler. * * @param File $file File object for file in question * @param array $params Array of parameters so far * @return array Parameters array with more parameters */ function wfExtractThumbParams( $file, $params ) { if ( !isset( $params['thumbName'] ) ) { throw new InvalidArgumentException( "No thumbnail name passed to wfExtractThumbParams" ); } $thumbname = $params['thumbName']; unset( $params['thumbName'] ); // Do the hook first for older extensions that rely on it. if ( !Hooks::run( 'ExtractThumbParameters', array( $thumbname, &$params ) ) ) { // Check hooks if parameters can be extracted // Hooks return false if they manage to *resolve* the parameters // This hook should be considered deprecated wfDeprecated( 'ExtractThumbParameters', '1.22' ); return $params; // valid thumbnail URL (via extension or config) } // FIXME: Files in the temp zone don't set a MIME type, which means // they don't have a handler. Which means we can't parse the param // string. However, not a big issue as what good is a param string // if you have no handler to make use of the param string and // actually generate the thumbnail. $handler = $file->getHandler(); // Based on UploadStash::parseKey $fileNamePos = strrpos( $thumbname, $params['f'] ); if ( $fileNamePos === false ) { // Maybe using a short filename? (see FileRepo::nameForThumb) $fileNamePos = strrpos( $thumbname, 'thumbnail' ); } if ( $handler && $fileNamePos !== false ) { $paramString = substr( $thumbname, 0, $fileNamePos - 1 ); $extraParams = $handler->parseParamString( $paramString ); if ( $extraParams !== false ) { return $params + $extraParams; } } // As a last ditch fallback, use the traditional common parameters if ( preg_match( '!^(page(\d*)-)*(\d*)px-[^/]*$!', $thumbname, $matches ) ) { list( /* all */, /* pagefull */, $pagenum, $size ) = $matches; $params['width'] = $size; if ( $pagenum ) { $params['page'] = $pagenum; } return $params; // valid thumbnail URL } return null; } /** * Output a thumbnail generation error message * * @param int $status * @param string $msgText Plain text (will be html escaped) * @return void */ function wfThumbErrorText( $status, $msgText ) { wfThumbError( $status, htmlspecialchars( $msgText ) ); } /** * Output a thumbnail generation error message * * @param int $status * @param string $msgHtml HTML * @return void */ function wfThumbError( $status, $msgHtml ) { global $wgShowHostnames; header( 'Cache-Control: no-cache' ); header( 'Content-Type: text/html; charset=utf-8' ); if ( $status == 400 || $status == 404 || $status == 429 ) { HttpStatus::header( $status ); } elseif ( $status == 403 ) { HttpStatus::header( 403 ); header( 'Vary: Cookie' ); } else { HttpStatus::header( 500 ); } if ( $wgShowHostnames ) { header( 'X-MW-Thumbnail-Renderer: ' . wfHostname() ); $url = htmlspecialchars( isset( $_SERVER['REQUEST_URI'] ) ? $_SERVER['REQUEST_URI'] : '' ); $hostname = htmlspecialchars( wfHostname() ); $debug = "\n\n"; } else { $debug = ''; } $content = << Error generating thumbnail

Error generating thumbnail

$msgHtml

$debug EOT; header( 'Content-Length: ' . strlen( $content ) ); echo $content; }