<?php
/**
 * Assemble the segments of a chunked upload.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * http://www.gnu.org/copyleft/gpl.html
 *
 * @file
 * @ingroup Upload
 */

/**
 * Assemble the segments of a chunked upload.
 *
 * @ingroup Upload
 */
class AssembleUploadChunksJob extends Job {
	public function __construct( $title, $params ) {
		parent::__construct( 'AssembleUploadChunks', $title, $params );
		$this->removeDuplicates = true;
	}

	public function run() {
		$scope = RequestContext::importScopedSession( $this->params['session'] );
		$context = RequestContext::getMain();
		try {
			$user = $context->getUser();
			if ( !$user->isLoggedIn() ) {
				$this->setLastError( "Could not load the author user from session." );

				return false;
			}

			if ( count( $_SESSION ) === 0 ) {
				// Empty session probably indicates that we didn't associate
				// with the session correctly. Note that being able to load
				// the user does not necessarily mean the session was loaded.
				// Most likely cause by suhosin.session.encrypt = On.
				$this->setLastError( "Error associating with user session. " .
					"Try setting suhosin.session.encrypt = Off" );

				return false;
			}

			UploadBase::setSessionStatus(
				$this->params['filekey'],
				array( 'result' => 'Poll', 'stage' => 'assembling', 'status' => Status::newGood() )
			);

			$upload = new UploadFromChunks( $user );
			$upload->continueChunks(
				$this->params['filename'],
				$this->params['filekey'],
				$context->getRequest()
			);

			// Combine all of the chunks into a local file and upload that to a new stash file
			$status = $upload->concatenateChunks();
			if ( !$status->isGood() ) {
				UploadBase::setSessionStatus(
					$this->params['filekey'],
					array( 'result' => 'Failure', 'stage' => 'assembling', 'status' => $status )
				);
				$this->setLastError( $status->getWikiText() );

				return false;
			}

			// We have a new filekey for the fully concatenated file
			$newFileKey = $upload->getLocalFile()->getFileKey();

			// Remove the old stash file row and first chunk file
			$upload->stash->removeFileNoAuth( $this->params['filekey'] );

			// Build the image info array while we have the local reference handy
			$apiMain = new ApiMain(); // dummy object (XXX)
			$imageInfo = $upload->getImageInfo( $apiMain->getResult() );

			// Cleanup any temporary local file
			$upload->cleanupTempFile();

			// Cache the info so the user doesn't have to wait forever to get the final info
			UploadBase::setSessionStatus(
				$this->params['filekey'],
				array(
					'result' => 'Success',
					'stage' => 'assembling',
					'filekey' => $newFileKey,
					'imageinfo' => $imageInfo,
					'status' => Status::newGood()
				)
			);
		} catch ( MWException $e ) {
			UploadBase::setSessionStatus(
				$this->params['filekey'],
				array(
					'result' => 'Failure',
					'stage' => 'assembling',
					'status' => Status::newFatal( 'api-error-stashfailed' )
				)
			);
			$this->setLastError( get_class( $e ) . ": " . $e->getText() );
			// To be extra robust.
			MWExceptionHandler::rollbackMasterChangesAndLog( $e );

			return false;
		}

		return true;
	}

	public function getDeduplicationInfo() {
		$info = parent::getDeduplicationInfo();
		if ( is_array( $info['params'] ) ) {
			$info['params'] = array( 'filekey' => $info['params']['filekey'] );
		}

		return $info;
	}

	public function allowRetries() {
		return false;
	}
}
