UploadFromChunks.php

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<?php
class UploadFromChunks extends UploadFromFile {
        protected $mOffset, $mChunkIndex, $mFileKey, $mVirtualTempPath;
        
        public function __construct( $user = false, $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 );
                }

                return true;
        }
        public function stashFile() {
                // 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();
                // 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:
                $status = $this->outputChunk( $this->mLocalFile->getPath() );
                
                // Update db table to reflect initial "chunk" state 
                $this->updateChunkStatus();
                return $this->mLocalFile;
        }
        
        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
                );
        }
        
        public function concatenateChunks() {
                wfDebug( __METHOD__ . " concatenate {$this->mChunkIndex} chunks:" . 
                        $this->getOffset() . ' inx:' . $this->getChunkIndex() . "\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 <= $this->getChunkIndex(); $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 = $tmpFile
                        ? $tmpFile->getPath()
                        : false; // fail in concatenate()
                // Concatenate the chunks at the temp file
                $status = $this->repo->concatenate( $fileList, $tmpPath, FileRepo::DELETE_SOURCE );
                if( !$status->isOk() ){
                        return $status; 
                }

                $this->mTempPath = $tmpPath; // file system path
                $this->mFileSize = filesize( $this->mTempPath ); //Since this was set for the last chunk previously
                $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 )  
                $this->mLocalFile = parent::stashFile();

                return $status;
        }

        public function performUpload( $comment, $pageText, $watch, $user ) {
                $rv = parent::performUpload( $comment, $pageText, $watch, $user );
                return $rv;
        }

        function getVirtualChunkLocation( $index ){
                return $this->repo->getVirtualUrl( 'temp' ) . 
                                '/' .
                                $this->repo->getHashPath( 
                                        $this->getChunkFileKey( $index )
                                ) . 
                                $this->getChunkFileKey( $index );
        }
        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;
        }
        
        private function updateChunkStatus(){
                wfDebug( __METHOD__ . " update chunk status for {$this->mFileKey} offset:" . 
                                        $this->getOffset() . ' inx:' . $this->getChunkIndex() . "\n" );
                
                $dbw = $this->repo->getMasterDb();
                $dbw->update(
                        'uploadstash',
                        array( 
                                'us_status' => 'chunks',
                                'us_chunk_inx' => $this->getChunkIndex(),
                                'us_size' => $this->getOffset()
                        ),
                        array( 'us_key' => $this->mFileKey ),
                        __METHOD__
                );
        }
        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;
                }
        }
        private function getChunkIndex(){
                if( $this->mChunkIndex !== null ){
                        return $this->mChunkIndex;
                }
                return 0;
        }
        
        private function getOffset(){
                if ( $this->mOffset !== null ){
                        return $this->mOffset;
                }
                return 0;
        }
        
        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->store( $chunkPath, 'temp', "$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 ;
        }

        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 {};