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[mediawiki.git] / includes / upload / UploadFromChunks.php

<?php
/**
 * Backend for uploading files from chunks.
 *
 * 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
 */

/**
 * Implements uploading from chunks
 *
 * @ingroup Upload
 * @author Michael Dale
 */
class UploadFromChunks extends UploadFromFile {
        protected $mOffset;
        protected $mChunkIndex;
        protected $mFileKey;
        protected $mVirtualTempPath;
        /** @var LocalRepo */
        private $repo;

        /**
         * Setup local pointers to stash, repo and user (similar to UploadFromStash)
         *
         * @param User|null $user Default: null
         * @param UploadStash|bool $stash Default: false
         * @param FileRepo|bool $repo Default: false
         */
        public function __construct( $user = null, $stash = false, $repo = false ) {
                // user object. sometimes this won't exist, as when running from cron.
                $this->user = $user;

                if ( $repo ) {
                        $this->repo = $repo;
                } else {
                        $this->repo = RepoGroup::singleton()->getLocalRepo();
                }

                if ( $stash ) {
                        $this->stash = $stash;
                } else {
                        if ( $user ) {
                                wfDebug( __METHOD__ . " creating new UploadFromChunks instance for " . $user->getId() . "\n" );
                        } else {
                                wfDebug( __METHOD__ . " creating new UploadFromChunks instance with no user\n" );
                        }
                        $this->stash = new UploadStash( $this->repo, $this->user );
                }
        }

        /**
         * Calls the parent stashFile and updates the uploadsession table to handle "chunks"
         *
         * @param User|null $user
         * @return UploadStashFile Stashed file
         */
        public function stashFile( User $user = null ) {
                // Stash file is the called on creating a new chunk session:
                $this->mChunkIndex = 0;
                $this->mOffset = 0;

                $this->verifyChunk();
                // Create a local stash target
                $this->mLocalFile = parent::stashFile( $user );
                // Update the initial file offset (based on file size)
                $this->mOffset = $this->mLocalFile->getSize();
                $this->mFileKey = $this->mLocalFile->getFileKey();

                // Output a copy of this first to chunk 0 location:
                $this->outputChunk( $this->mLocalFile->getPath() );

                // Update db table to reflect initial "chunk" state
                $this->updateChunkStatus();

                return $this->mLocalFile;
        }

        /**
         * Continue chunk uploading
         *
         * @param string $name
         * @param string $key
         * @param WebRequestUpload $webRequestUpload
         */
        public function continueChunks( $name, $key, $webRequestUpload ) {
                $this->mFileKey = $key;
                $this->mUpload = $webRequestUpload;
                // Get the chunk status form the db:
                $this->getChunkStatus();

                $metadata = $this->stash->getMetadata( $key );
                $this->initializePathInfo( $name,
                        $this->getRealPath( $metadata['us_path'] ),
                        $metadata['us_size'],
                        false
                );
        }

        /**
         * Append the final chunk and ready file for parent::performUpload()
         * @return FileRepoStatus
         */
        public function concatenateChunks() {
                $chunkIndex = $this->getChunkIndex();
                wfDebug( __METHOD__ . " concatenate {$this->mChunkIndex} chunks:" .
                        $this->getOffset() . ' inx:' . $chunkIndex . "\n" );

                // Concatenate all the chunks to mVirtualTempPath
                $fileList = array();
                // The first chunk is stored at the mVirtualTempPath path so we start on "chunk 1"
                for ( $i = 0; $i <= $chunkIndex; $i++ ) {
                        $fileList[] = $this->getVirtualChunkLocation( $i );
                }

                // Get the file extension from the last chunk
                $ext = FileBackend::extensionFromPath( $this->mVirtualTempPath );
                // Get a 0-byte temp file to perform the concatenation at
                $tmpFile = TempFSFile::factory( 'chunkedupload_', $ext );
                $tmpPath = false; // fail in concatenate()
                if ( $tmpFile ) {
                        // keep alive with $this
                        $tmpPath = $tmpFile->bind( $this )->getPath();
                }

                // Concatenate the chunks at the temp file
                $tStart = microtime( true );
                $status = $this->repo->concatenate( $fileList, $tmpPath, FileRepo::DELETE_SOURCE );
                $tAmount = microtime( true ) - $tStart;
                if ( !$status->isOk() ) {
                        return $status;
                }
                wfDebugLog( 'fileconcatenate', "Combined $i chunks in $tAmount seconds." );

                // File system path
                $this->mTempPath = $tmpPath;
                // Since this was set for the last chunk previously
                $this->mFileSize = filesize( $this->mTempPath );
                $ret = $this->verifyUpload();
                if ( $ret['status'] !== UploadBase::OK ) {
                        wfDebugLog( 'fileconcatenate', "Verification failed for chunked upload" );
                        $status->fatal( $this->getVerificationErrorCode( $ret['status'] ) );

                        return $status;
                }

                // Update the mTempPath and mLocalFile
                // (for FileUpload or normal Stash to take over)
                $tStart = microtime( true );
                $this->mLocalFile = parent::stashFile( $this->user );
                $tAmount = microtime( true ) - $tStart;
                $this->mLocalFile->setLocalReference( $tmpFile ); // reuse (e.g. for getImageInfo())
                wfDebugLog( 'fileconcatenate', "Stashed combined file ($i chunks) in $tAmount seconds." );

                return $status;
        }

        /**
         * Returns the virtual chunk location:
         * @param int $index
         * @return string
         */
        function getVirtualChunkLocation( $index ) {
                return $this->repo->getVirtualUrl( 'temp' ) .
                        '/' .
                        $this->repo->getHashPath(
                                $this->getChunkFileKey( $index )
                        ) .
                        $this->getChunkFileKey( $index );
        }

        /**
         * Add a chunk to the temporary directory
         *
         * @param string $chunkPath Path to temporary chunk file
         * @param int $chunkSize Size of the current chunk
         * @param int $offset Offset of current chunk ( mutch match database chunk offset )
         * @return Status
         */
        public function addChunk( $chunkPath, $chunkSize, $offset ) {
                // Get the offset before we add the chunk to the file system
                $preAppendOffset = $this->getOffset();

                if ( $preAppendOffset + $chunkSize > $this->getMaxUploadSize() ) {
                        $status = Status::newFatal( 'file-too-large' );
                } else {
                        // Make sure the client is uploading the correct chunk with a matching offset.
                        if ( $preAppendOffset == $offset ) {
                                // Update local chunk index for the current chunk
                                $this->mChunkIndex++;
                                try {
                                        # For some reason mTempPath is set to first part
                                        $oldTemp = $this->mTempPath;
                                        $this->mTempPath = $chunkPath;
                                        $this->verifyChunk();
                                        $this->mTempPath = $oldTemp;
                                } catch ( UploadChunkVerificationException $e ) {
                                        return Status::newFatal( $e->getMessage() );
                                }
                                $status = $this->outputChunk( $chunkPath );
                                if ( $status->isGood() ) {
                                        // Update local offset:
                                        $this->mOffset = $preAppendOffset + $chunkSize;
                                        // Update chunk table status db
                                        $this->updateChunkStatus();
                                }
                        } else {
                                $status = Status::newFatal( 'invalid-chunk-offset' );
                        }
                }

                return $status;
        }

        /**
         * Update the chunk db table with the current status:
         */
        private function updateChunkStatus() {
                wfDebug( __METHOD__ . " update chunk status for {$this->mFileKey} offset:" .
                        $this->getOffset() . ' inx:' . $this->getChunkIndex() . "\n" );

                $dbw = $this->repo->getMasterDb();
                // Use a quick transaction since we will upload the full temp file into shared
                // storage, which takes time for large files. We don't want to hold locks then.
                $dbw->update(
                        'uploadstash',
                        array(
                                'us_status' => 'chunks',
                                'us_chunk_inx' => $this->getChunkIndex(),
                                'us_size' => $this->getOffset()
                        ),
                        array( 'us_key' => $this->mFileKey ),
                        __METHOD__
                );
                $dbw->commit( __METHOD__, 'flush' );
        }

        /**
         * Get the chunk db state and populate update relevant local values
         */
        private function getChunkStatus() {
                // get Master db to avoid race conditions.
                // Otherwise, if chunk upload time < replag there will be spurious errors
                $dbw = $this->repo->getMasterDb();
                $row = $dbw->selectRow(
                        'uploadstash',
                        array(
                                'us_chunk_inx',
                                'us_size',
                                'us_path',
                        ),
                        array( 'us_key' => $this->mFileKey ),
                        __METHOD__
                );
                // Handle result:
                if ( $row ) {
                        $this->mChunkIndex = $row->us_chunk_inx;
                        $this->mOffset = $row->us_size;
                        $this->mVirtualTempPath = $row->us_path;
                }
        }

        /**
         * Get the current Chunk index
         * @return int Index of the current chunk
         */
        private function getChunkIndex() {
                if ( $this->mChunkIndex !== null ) {
                        return $this->mChunkIndex;
                }

                return 0;
        }

        /**
         * Get the offset at which the next uploaded chunk will be appended to
         * @return int Current byte offset of the chunk file set
         */
        public function getOffset() {
                if ( $this->mOffset !== null ) {
                        return $this->mOffset;
                }

                return 0;
        }

        /**
         * Output the chunk to disk
         *
         * @param string $chunkPath
         * @throws UploadChunkFileException
         * @return FileRepoStatus
         */
        private function outputChunk( $chunkPath ) {
                // Key is fileKey + chunk index
                $fileKey = $this->getChunkFileKey();

                // Store the chunk per its indexed fileKey:
                $hashPath = $this->repo->getHashPath( $fileKey );
                $storeStatus = $this->repo->quickImport( $chunkPath,
                        $this->repo->getZonePath( 'temp' ) . "/{$hashPath}{$fileKey}" );

                // Check for error in stashing the chunk:
                if ( !$storeStatus->isOK() ) {
                        $error = $storeStatus->getErrorsArray();
                        $error = reset( $error );
                        if ( !count( $error ) ) {
                                $error = $storeStatus->getWarningsArray();
                                $error = reset( $error );
                                if ( !count( $error ) ) {
                                        $error = array( 'unknown', 'no error recorded' );
                                }
                        }
                        throw new UploadChunkFileException( "Error storing file in '$chunkPath': " .
                                implode( '; ', $error ) );
                }

                return $storeStatus;
        }

        private function getChunkFileKey( $index = null ) {
                if ( $index === null ) {
                        $index = $this->getChunkIndex();
                }

                return $this->mFileKey . '.' . $index;
        }

        /**
         * Verify that the chunk isn't really an evil html file
         *
         * @throws UploadChunkVerificationException
         */
        private function verifyChunk() {
                // Rest mDesiredDestName here so we verify the name as if it were mFileKey
                $oldDesiredDestName = $this->mDesiredDestName;
                $this->mDesiredDestName = $this->mFileKey;
                $this->mTitle = false;
                $res = $this->verifyPartialFile();
                $this->mDesiredDestName = $oldDesiredDestName;
                $this->mTitle = false;
                if ( is_array( $res ) ) {
                        throw new UploadChunkVerificationException( $res[0] );
                }
        }
}

class UploadChunkZeroLengthFileException extends MWException {
}

class UploadChunkFileException extends MWException {
}

class UploadChunkVerificationException extends MWException {
}