stash = RepoGroup::singleton()->getLocalRepo()->getUploadStash(); } catch ( UploadStashNotAvailableException $e ) { } } /** * Execute page -- can output a file directly or show a listing of them. * * @param $subPage String: subpage, e.g. in http://example.com/wiki/Special:UploadStash/foo.jpg, the "foo.jpg" part * @return Boolean: success */ public function execute( $subPage ) { $this->checkPermissions(); if ( $subPage === null || $subPage === '' ) { return $this->showUploads(); } return $this->showUpload( $subPage ); } /** * If file available in stash, cats it out to the client as a simple HTTP response. * n.b. Most sanity checking done in UploadStashLocalFile, so this is straightforward. * * @param $key String: the key of a particular requested file * @return bool */ public function showUpload( $key ) { // prevent callers from doing standard HTML output -- we'll take it from here $this->getOutput()->disable(); try { $params = $this->parseKey( $key ); if ( $params['type'] === 'thumb' ) { return $this->outputThumbFromStash( $params['file'], $params['params'] ); } else { return $this->outputLocalFile( $params['file'] ); } } catch( UploadStashFileNotFoundException $e ) { $code = 404; $message = $e->getMessage(); } catch( UploadStashZeroLengthFileException $e ) { $code = 500; $message = $e->getMessage(); } catch( UploadStashBadPathException $e ) { $code = 500; $message = $e->getMessage(); } catch( SpecialUploadStashTooLargeException $e ) { $code = 500; $message = 'Cannot serve a file larger than ' . self::MAX_SERVE_BYTES . ' bytes. ' . $e->getMessage(); } catch( Exception $e ) { $code = 500; $message = $e->getMessage(); } throw new HttpError( $code, $message ); } /** * Parse the key passed to the SpecialPage. Returns an array containing * the associated file object, the type ('file' or 'thumb') and if * application the transform parameters * * @param string $key * @return array */ private function parseKey( $key ) { $type = strtok( $key, '/' ); if ( $type !== 'file' && $type !== 'thumb' ) { throw new UploadStashBadPathException( "Unknown type '$type'" ); } $fileName = strtok( '/' ); $thumbPart = strtok( '/' ); $file = $this->stash->getFile( $fileName ); if ( $type === 'thumb' ) { $srcNamePos = strrpos( $thumbPart, $fileName ); if ( $srcNamePos === false || $srcNamePos < 1 ) { throw new UploadStashBadPathException( 'Unrecognized thumb name' ); } $paramString = substr( $thumbPart, 0, $srcNamePos - 1 ); $handler = $file->getHandler(); $params = $handler->parseParamString( $paramString ); return array( 'file' => $file, 'type' => $type, 'params' => $params ); } return array( 'file' => $file, 'type' => $type ); } /** * Get a thumbnail for file, either generated locally or remotely, and stream it out * * @param $file * @param $params array * * @return boolean success */ private function outputThumbFromStash( $file, $params ) { // this global, if it exists, points to a "scaler", as you might find in the Wikimedia Foundation cluster. See outputRemoteScaledThumb() // this is part of our horrible NFS-based system, we create a file on a mount point here, but fetch the scaled file from somewhere else that // happens to share it over NFS global $wgUploadStashScalerBaseUrl; $flags = 0; if ( $wgUploadStashScalerBaseUrl ) { $this->outputRemoteScaledThumb( $file, $params, $flags ); } else { $this->outputLocallyScaledThumb( $file, $params, $flags ); } } /** * Scale a file (probably with a locally installed imagemagick, or similar) and output it to STDOUT. * @param $file: File object * @param $params: scaling parameters ( e.g. array( width => '50' ) ); * @param $flags: scaling flags ( see File:: constants ) * @throws MWException * @return boolean success */ private function outputLocallyScaledThumb( $file, $params, $flags ) { // n.b. this is stupid, we insist on re-transforming the file every time we are invoked. We rely // on HTTP caching to ensure this doesn't happen. $flags |= File::RENDER_NOW; $thumbnailImage = $file->transform( $params, $flags ); if ( !$thumbnailImage ) { throw new MWException( 'Could not obtain thumbnail' ); } // we should have just generated it locally if ( !$thumbnailImage->getStoragePath() ) { throw new UploadStashFileNotFoundException( "no local path for scaled item" ); } // now we should construct a File, so we can get mime and other such info in a standard way // n.b. mimetype may be different from original (ogx original -> jpeg thumb) $thumbFile = new UnregisteredLocalFile( false, $this->stash->repo, $thumbnailImage->getStoragePath(), false ); if ( !$thumbFile ) { throw new UploadStashFileNotFoundException( "couldn't create local file object for thumbnail" ); } return $this->outputLocalFile( $thumbFile ); } /** * Scale a file with a remote "scaler", as exists on the Wikimedia Foundation cluster, and output it to STDOUT. * Note: unlike the usual thumbnail process, the web client never sees the cluster URL; we do the whole HTTP transaction to the scaler ourselves * and cat the results out. * Note: We rely on NFS to have propagated the file contents to the scaler. However, we do not rely on the thumbnail being created in NFS and then * propagated back to our filesystem. Instead we take the results of the HTTP request instead. * Note: no caching is being done here, although we are instructing the client to cache it forever. * @param $file: File object * @param $params: scaling parameters ( e.g. array( width => '50' ) ); * @param $flags: scaling flags ( see File:: constants ) * @throws MWException * @return boolean success */ private function outputRemoteScaledThumb( $file, $params, $flags ) { // this global probably looks something like 'http://upload.wikimedia.org/wikipedia/test/thumb/temp' // do not use trailing slash global $wgUploadStashScalerBaseUrl; $scalerBaseUrl = $wgUploadStashScalerBaseUrl; if( preg_match( '/^\/\//', $scalerBaseUrl ) ) { // this is apparently a protocol-relative URL, which makes no sense in this context, // since this is used for communication that's internal to the application. // default to http. $scalerBaseUrl = wfExpandUrl( $scalerBaseUrl, PROTO_CANONICAL ); } // We need to use generateThumbName() instead of thumbName(), because // the suffix needs to match the file name for the remote thumbnailer // to work $scalerThumbName = $file->generateThumbName( $file->getName(), $params ); $scalerThumbUrl = $scalerBaseUrl . '/' . $file->getUrlRel() . '/' . rawurlencode( $scalerThumbName ); // make a curl call to the scaler to create a thumbnail $httpOptions = array( 'method' => 'GET', 'timeout' => 'default' ); $req = MWHttpRequest::factory( $scalerThumbUrl, $httpOptions ); $status = $req->execute(); if ( ! $status->isOK() ) { $errors = $status->getErrorsArray(); $errorStr = "Fetching thumbnail failed: " . print_r( $errors, 1 ); $errorStr .= "\nurl = $scalerThumbUrl\n"; throw new MWException( $errorStr ); } $contentType = $req->getResponseHeader( "content-type" ); if ( ! $contentType ) { throw new MWException( "Missing content-type header" ); } return $this->outputContents( $req->getContent(), $contentType ); } /** * Output HTTP response for file * Side effect: writes HTTP response to STDOUT. * * @param $file File object with a local path (e.g. UnregisteredLocalFile, LocalFile. Oddly these don't share an ancestor!) * @return bool */ private function outputLocalFile( File $file ) { if ( $file->getSize() > self::MAX_SERVE_BYTES ) { throw new SpecialUploadStashTooLargeException(); } return $file->getRepo()->streamFile( $file->getPath(), array( 'Content-Transfer-Encoding: binary', 'Expires: Sun, 17-Jan-2038 19:14:07 GMT' ) ); } /** * Output HTTP response of raw content * Side effect: writes HTTP response to STDOUT. * @param $content String content * @param $contentType String mime type * @return bool */ private function outputContents( $content, $contentType ) { $size = strlen( $content ); if ( $size > self::MAX_SERVE_BYTES ) { throw new SpecialUploadStashTooLargeException(); } self::outputFileHeaders( $contentType, $size ); print $content; return true; } /** * Output headers for streaming * XXX unsure about encoding as binary; if we received from HTTP perhaps we should use that encoding, concatted with semicolon to mimeType as it usually is. * Side effect: preps PHP to write headers to STDOUT. * @param String $contentType : string suitable for content-type header * @param String $size: length in bytes */ private static function outputFileHeaders( $contentType, $size ) { header( "Content-Type: $contentType", true ); header( 'Content-Transfer-Encoding: binary', true ); header( 'Expires: Sun, 17-Jan-2038 19:14:07 GMT', true ); header( "Content-Length: $size", true ); } /** * Static callback for the HTMLForm in showUploads, to process * Note the stash has to be recreated since this is being called in a static context. * This works, because there really is only one stash per logged-in user, despite appearances. * * @return Status */ public static function tryClearStashedUploads( $formData ) { if ( isset( $formData['Clear'] ) ) { $stash = RepoGroup::singleton()->getLocalRepo()->getUploadStash(); wfDebug( "stash has: " . print_r( $stash->listFiles(), true ) ); if ( ! $stash->clear() ) { return Status::newFatal( 'uploadstash-errclear' ); } } return Status::newGood(); } /** * Default action when we don't have a subpage -- just show links to the uploads we have, * Also show a button to clear stashed files * @param $status [optional] Status: the result of processRequest * @return bool */ private function showUploads( $status = null ) { if ( $status === null ) { $status = Status::newGood(); } // sets the title, etc. $this->setHeaders(); $this->outputHeader(); // create the form, which will also be used to execute a callback to process incoming form data // this design is extremely dubious, but supposedly HTMLForm is our standard now? $form = new HTMLForm( array( 'Clear' => array( 'type' => 'hidden', 'default' => true, 'name' => 'clear', ) ), $this->getContext(), 'clearStashedUploads' ); $form->setSubmitCallback( array( __CLASS__ , 'tryClearStashedUploads' ) ); $form->setTitle( $this->getTitle() ); $form->setSubmitTextMsg( 'uploadstash-clear' ); $form->prepareForm(); $formResult = $form->tryAuthorizedSubmit(); // show the files + form, if there are any, or just say there are none $refreshHtml = Html::element( 'a', array( 'href' => $this->getTitle()->getLocalURL() ), $this->msg( 'uploadstash-refresh' )->text() ); $files = $this->stash->listFiles(); if ( $files && count( $files ) ) { sort( $files ); $fileListItemsHtml = ''; foreach ( $files as $file ) { // TODO: Use Linker::link or even construct the list in plain wikitext $fileListItemsHtml .= Html::rawElement( 'li', array(), Html::element( 'a', array( 'href' => $this->getTitle( "file/$file" )->getLocalURL() ), $file ) ); } $this->getOutput()->addHtml( Html::rawElement( 'ul', array(), $fileListItemsHtml ) ); $form->displayForm( $formResult ); $this->getOutput()->addHtml( Html::rawElement( 'p', array(), $refreshHtml ) ); } else { $this->getOutput()->addHtml( Html::rawElement( 'p', array(), Html::element( 'span', array(), $this->msg( 'uploadstash-nofiles' )->text() ) . ' ' . $refreshHtml ) ); } return true; } } class SpecialUploadStashTooLargeException extends MWException {};