ApiUpload.php

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<?php
class ApiUpload extends ApiBase {
    protected $mUpload = null;
 
    protected $mParams;
 
    public function execute() {
        // Check whether upload is enabled
        if ( !UploadBase::isEnabled() ) {
            $this->dieUsageMsg( 'uploaddisabled' );
        }
 
        $user = $this->getUser();
 
        // Parameter handling
        $this->mParams = $this->extractRequestParams();
        $request = $this->getMain()->getRequest();
        // Check if async mode is actually supported (jobs done in cli mode)
        $this->mParams['async'] = ( $this->mParams['async'] &&
            $this->getConfig()->get( 'EnableAsyncUploads' ) );
        // Add the uploaded file to the params array
        $this->mParams['file'] = $request->getFileName( 'file' );
        $this->mParams['chunk'] = $request->getFileName( 'chunk' );
 
        // Copy the session key to the file key, for backward compatibility.
        if ( !$this->mParams['filekey'] && $this->mParams['sessionkey'] ) {
            $this->mParams['filekey'] = $this->mParams['sessionkey'];
        }
 
        // Select an upload module
        try {
            if ( !$this->selectUploadModule() ) {
                return; // not a true upload, but a status request or similar
            } elseif ( !isset( $this->mUpload ) ) {
                $this->dieUsage( 'No upload module set', 'nomodule' );
            }
        } catch ( UploadStashException $e ) { // XXX: don't spam exception log
            list( $msg, $code ) = $this->handleStashException( get_class( $e ), $e->getMessage() );
            $this->dieUsage( $msg, $code );
        }
 
        // First check permission to upload
        $this->checkPermissions( $user );
 
        // Fetch the file (usually a no-op)
        $status = $this->mUpload->fetchFile();
        if ( !$status->isGood() ) {
            $errors = $status->getErrorsArray();
            $error = array_shift( $errors[0] );
            $this->dieUsage( 'Error fetching file from remote source', $error, 0, $errors[0] );
        }
 
        // Check if the uploaded file is sane
        if ( $this->mParams['chunk'] ) {
            $maxSize = UploadBase::getMaxUploadSize();
            if ( $this->mParams['filesize'] > $maxSize ) {
                $this->dieUsage( 'The file you submitted was too large', 'file-too-large' );
            }
            if ( !$this->mUpload->getTitle() ) {
                $this->dieUsage( 'Invalid file title supplied', 'internal-error' );
            }
        } elseif ( $this->mParams['async'] && $this->mParams['filekey'] ) {
            // defer verification to background process
        } else {
            wfDebug( __METHOD__ . " about to verify\n" );
            $this->verifyUpload();
        }
 
        // Check if the user has the rights to modify or overwrite the requested title
        // (This check is irrelevant if stashing is already requested, since the errors
        //  can always be fixed by changing the title)
        if ( !$this->mParams['stash'] ) {
            $permErrors = $this->mUpload->verifyTitlePermissions( $user );
            if ( $permErrors !== true ) {
                $this->dieRecoverableError( $permErrors[0], 'filename' );
            }
        }
 
        // Get the result based on the current upload context:
        try {
            $result = $this->getContextResult();
        } catch ( UploadStashException $e ) { // XXX: don't spam exception log
            list( $msg, $code ) = $this->handleStashException( get_class( $e ), $e->getMessage() );
            $this->dieUsage( $msg, $code );
        }
        $this->getResult()->addValue( null, $this->getModuleName(), $result );
 
        // Add 'imageinfo' in a separate addValue() call. File metadata can be unreasonably large,
        // so otherwise when it exceeded $wgAPIMaxResultSize, no result would be returned (T143993).
        if ( $result['result'] === 'Success' ) {
            $imageinfo = $this->mUpload->getImageInfo( $this->getResult() );
            $this->getResult()->addValue( $this->getModuleName(), 'imageinfo', $imageinfo );
        }
 
        // Cleanup any temporary mess
        $this->mUpload->cleanupTempFile();
    }
 
    private function getContextResult() {
        $warnings = $this->getApiWarnings();
        if ( $warnings && !$this->mParams['ignorewarnings'] ) {
            // Get warnings formatted in result array format
            return $this->getWarningsResult( $warnings );
        } elseif ( $this->mParams['chunk'] ) {
            // Add chunk, and get result
            return $this->getChunkResult( $warnings );
        } elseif ( $this->mParams['stash'] ) {
            // Stash the file and get stash result
            return $this->getStashResult( $warnings );
        }
 
        // Check throttle after we've handled warnings
        if ( UploadBase::isThrottled( $this->getUser() )
        ) {
            $this->dieUsageMsg( 'actionthrottledtext' );
        }
 
        // This is the most common case -- a normal upload with no warnings
        // performUpload will return a formatted properly for the API with status
        return $this->performUpload( $warnings );
    }
 
    private function getStashResult( $warnings ) {
        $result = [];
        $result['result'] = 'Success';
        if ( $warnings && count( $warnings ) > 0 ) {
            $result['warnings'] = $warnings;
        }
        // Some uploads can request they be stashed, so as not to publish them immediately.
        // In this case, a failure to stash ought to be fatal
        $this->performStash( 'critical', $result );
 
        return $result;
    }
 
    private function getWarningsResult( $warnings ) {
        $result = [];
        $result['result'] = 'Warning';
        $result['warnings'] = $warnings;
        // in case the warnings can be fixed with some further user action, let's stash this upload
        // and return a key they can use to restart it
        $this->performStash( 'optional', $result );
 
        return $result;
    }
 
    private function getChunkResult( $warnings ) {
        $result = [];
 
        if ( $warnings && count( $warnings ) > 0 ) {
            $result['warnings'] = $warnings;
        }
 
        $request = $this->getMain()->getRequest();
        $chunkPath = $request->getFileTempname( 'chunk' );
        $chunkSize = $request->getUpload( 'chunk' )->getSize();
        $totalSoFar = $this->mParams['offset'] + $chunkSize;
        $minChunkSize = $this->getConfig()->get( 'MinUploadChunkSize' );
 
        // Sanity check sizing
        if ( $totalSoFar > $this->mParams['filesize'] ) {
            $this->dieUsage(
                'Offset plus current chunk is greater than claimed file size', 'invalid-chunk'
            );
        }
 
        // Enforce minimum chunk size
        if ( $totalSoFar != $this->mParams['filesize'] && $chunkSize < $minChunkSize ) {
            $this->dieUsage(
                "Minimum chunk size is $minChunkSize bytes for non-final chunks", 'chunk-too-small'
            );
        }
 
        if ( $this->mParams['offset'] == 0 ) {
            $filekey = $this->performStash( 'critical' );
        } else {
            $filekey = $this->mParams['filekey'];
 
            // Don't allow further uploads to an already-completed session
            $progress = UploadBase::getSessionStatus( $this->getUser(), $filekey );
            if ( !$progress ) {
                // Probably can't get here, but check anyway just in case
                $this->dieUsage( 'No chunked upload session with this key', 'stashfailed' );
            } elseif ( $progress['result'] !== 'Continue' || $progress['stage'] !== 'uploading' ) {
                $this->dieUsage(
                    'Chunked upload is already completed, check status for details', 'stashfailed'
                );
            }
 
            $status = $this->mUpload->addChunk(
                $chunkPath, $chunkSize, $this->mParams['offset'] );
            if ( !$status->isGood() ) {
                $extradata = [
                    'offset' => $this->mUpload->getOffset(),
                ];
 
                $this->dieStatusWithCode( $status, 'stashfailed', $extradata );
            }
        }
 
        // Check we added the last chunk:
        if ( $totalSoFar == $this->mParams['filesize'] ) {
            if ( $this->mParams['async'] ) {
                UploadBase::setSessionStatus(
                    $this->getUser(),
                    $filekey,
                    [ 'result' => 'Poll',
                        'stage' => 'queued', 'status' => Status::newGood() ]
                );
                JobQueueGroup::singleton()->push( new AssembleUploadChunksJob(
                    Title::makeTitle( NS_FILE, $filekey ),
                    [
                        'filename' => $this->mParams['filename'],
                        'filekey' => $filekey,
                        'session' => $this->getContext()->exportSession()
                    ]
                ) );
                $result['result'] = 'Poll';
                $result['stage'] = 'queued';
            } else {
                $status = $this->mUpload->concatenateChunks();
                if ( !$status->isGood() ) {
                    UploadBase::setSessionStatus(
                        $this->getUser(),
                        $filekey,
                        [ 'result' => 'Failure', 'stage' => 'assembling', 'status' => $status ]
                    );
                    $this->dieStatusWithCode( $status, 'stashfailed' );
                }
 
                // We can only get warnings like 'duplicate' after concatenating the chunks
                $warnings = $this->getApiWarnings();
                if ( $warnings ) {
                    $result['warnings'] = $warnings;
                }
 
                // The fully concatenated file has a new filekey. So remove
                // the old filekey and fetch the new one.
                UploadBase::setSessionStatus( $this->getUser(), $filekey, false );
                $this->mUpload->stash->removeFile( $filekey );
                $filekey = $this->mUpload->getStashFile()->getFileKey();
 
                $result['result'] = 'Success';
            }
        } else {
            UploadBase::setSessionStatus(
                $this->getUser(),
                $filekey,
                [
                    'result' => 'Continue',
                    'stage' => 'uploading',
                    'offset' => $totalSoFar,
                    'status' => Status::newGood(),
                ]
            );
            $result['result'] = 'Continue';
            $result['offset'] = $totalSoFar;
        }
 
        $result['filekey'] = $filekey;
 
        return $result;
    }
 
    private function performStash( $failureMode, &$data = null ) {
        $isPartial = (bool)$this->mParams['chunk'];
        try {
            $status = $this->mUpload->tryStashFile( $this->getUser(), $isPartial );
 
            if ( $status->isGood() && !$status->getValue() ) {
                // Not actually a 'good' status...
                $status->fatal( new ApiRawMessage( 'Invalid stashed file', 'stashfailed' ) );
            }
        } catch ( Exception $e ) {
            $debugMessage = 'Stashing temporary file failed: ' . get_class( $e ) . ' ' . $e->getMessage();
            wfDebug( __METHOD__ . ' ' . $debugMessage . "\n" );
            $status = Status::newFatal( new ApiRawMessage( $e->getMessage(), 'stashfailed' ) );
        }
 
        if ( $status->isGood() ) {
            $stashFile = $status->getValue();
            $data['filekey'] = $stashFile->getFileKey();
            // Backwards compatibility
            $data['sessionkey'] = $data['filekey'];
            return $data['filekey'];
        }
 
        if ( $status->getMessage()->getKey() === 'uploadstash-exception' ) {
            // The exceptions thrown by upload stash code and pretty silly and UploadBase returns poor
            // Statuses for it. Just extract the exception details and parse them ourselves.
            list( $exceptionType, $message ) = $status->getMessage()->getParams();
            $debugMessage = 'Stashing temporary file failed: ' . $exceptionType . ' ' . $message;
            wfDebug( __METHOD__ . ' ' . $debugMessage . "\n" );
            list( $msg, $code ) = $this->handleStashException( $exceptionType, $message );
            $status = Status::newFatal( new ApiRawMessage( $msg, $code ) );
        }
 
        // Bad status
        if ( $failureMode !== 'optional' ) {
            $this->dieStatus( $status );
        } else {
            list( $code, $msg ) = $this->getErrorFromStatus( $status );
            $data['stashfailed'] = $msg;
            return null;
        }
    }
 
    private function dieRecoverableError( $error, $parameter, $data = [], $code = 'unknownerror' ) {
        $this->performStash( 'optional', $data );
        $data['invalidparameter'] = $parameter;
 
        $parsed = $this->parseMsg( $error );
        if ( isset( $parsed['data'] ) ) {
            $data = array_merge( $data, $parsed['data'] );
        }
        if ( $parsed['code'] === 'unknownerror' ) {
            $parsed['code'] = $code;
        }
 
        $this->dieUsage( $parsed['info'], $parsed['code'], 0, $data );
    }
 
    public function dieStatusWithCode( $status, $overrideCode, $moreExtraData = null ) {
        $extraData = null;
        list( $code, $msg ) = $this->getErrorFromStatus( $status, $extraData );
        $errors = $status->getErrorsByType( 'error' ) ?: $status->getErrorsByType( 'warning' );
        if ( !( $errors[0]['message'] instanceof IApiMessage ) ) {
            $code = $overrideCode;
        }
        if ( $moreExtraData ) {
            $extraData = $extraData ?: [];
            $extraData += $moreExtraData;
        }
        $this->dieUsage( $msg, $code, 0, $extraData );
    }
 
    protected function selectUploadModule() {
        $request = $this->getMain()->getRequest();
 
        // chunk or one and only one of the following parameters is needed
        if ( !$this->mParams['chunk'] ) {
            $this->requireOnlyOneParameter( $this->mParams,
                'filekey', 'file', 'url' );
        }
 
        // Status report for "upload to stash"/"upload from stash"
        if ( $this->mParams['filekey'] && $this->mParams['checkstatus'] ) {
            $progress = UploadBase::getSessionStatus( $this->getUser(), $this->mParams['filekey'] );
            if ( !$progress ) {
                $this->dieUsage( 'No result in status data', 'missingresult' );
            } elseif ( !$progress['status']->isGood() ) {
                $this->dieStatusWithCode( $progress['status'], 'stashfailed' );
            }
            if ( isset( $progress['status']->value['verification'] ) ) {
                $this->checkVerification( $progress['status']->value['verification'] );
            }
            if ( isset( $progress['status']->value['warnings'] ) ) {
                $warnings = $this->transformWarnings( $progress['status']->value['warnings'] );
                if ( $warnings ) {
                    $progress['warnings'] = $warnings;
                }
            }
            unset( $progress['status'] ); // remove Status object
            $imageinfo = null;
            if ( isset( $progress['imageinfo'] ) ) {
                $imageinfo = $progress['imageinfo'];
                unset( $progress['imageinfo'] );
            }
 
            $this->getResult()->addValue( null, $this->getModuleName(), $progress );
            // Add 'imageinfo' in a separate addValue() call. File metadata can be unreasonably large,
            // so otherwise when it exceeded $wgAPIMaxResultSize, no result would be returned (T143993).
            if ( $imageinfo ) {
                $this->getResult()->addValue( $this->getModuleName(), 'imageinfo', $imageinfo );
            }
 
            return false;
        }
 
        // The following modules all require the filename parameter to be set
        if ( is_null( $this->mParams['filename'] ) ) {
            $this->dieUsageMsg( [ 'missingparam', 'filename' ] );
        }
 
        if ( $this->mParams['chunk'] ) {
            // Chunk upload
            $this->mUpload = new UploadFromChunks( $this->getUser() );
            if ( isset( $this->mParams['filekey'] ) ) {
                if ( $this->mParams['offset'] === 0 ) {
                    $this->dieUsage( 'Cannot supply a filekey when offset is 0', 'badparams' );
                }
 
                // handle new chunk
                $this->mUpload->continueChunks(
                    $this->mParams['filename'],
                    $this->mParams['filekey'],
                    $request->getUpload( 'chunk' )
                );
            } else {
                if ( $this->mParams['offset'] !== 0 ) {
                    $this->dieUsage( 'Must supply a filekey when offset is non-zero', 'badparams' );
                }
 
                // handle first chunk
                $this->mUpload->initialize(
                    $this->mParams['filename'],
                    $request->getUpload( 'chunk' )
                );
            }
        } elseif ( isset( $this->mParams['filekey'] ) ) {
            // Upload stashed in a previous request
            if ( !UploadFromStash::isValidKey( $this->mParams['filekey'] ) ) {
                $this->dieUsageMsg( 'invalid-file-key' );
            }
 
            $this->mUpload = new UploadFromStash( $this->getUser() );
            // This will not download the temp file in initialize() in async mode.
            // We still have enough information to call checkWarnings() and such.
            $this->mUpload->initialize(
                $this->mParams['filekey'], $this->mParams['filename'], !$this->mParams['async']
            );
        } elseif ( isset( $this->mParams['file'] ) ) {
            $this->mUpload = new UploadFromFile();
            $this->mUpload->initialize(
                $this->mParams['filename'],
                $request->getUpload( 'file' )
            );
        } elseif ( isset( $this->mParams['url'] ) ) {
            // Make sure upload by URL is enabled:
            if ( !UploadFromUrl::isEnabled() ) {
                $this->dieUsageMsg( 'copyuploaddisabled' );
            }
 
            if ( !UploadFromUrl::isAllowedHost( $this->mParams['url'] ) ) {
                $this->dieUsageMsg( 'copyuploadbaddomain' );
            }
 
            if ( !UploadFromUrl::isAllowedUrl( $this->mParams['url'] ) ) {
                $this->dieUsageMsg( 'copyuploadbadurl' );
            }
 
            $this->mUpload = new UploadFromUrl;
            $this->mUpload->initialize( $this->mParams['filename'],
                $this->mParams['url'] );
        }
 
        return true;
    }
 
    protected function checkPermissions( $user ) {
        // Check whether the user has the appropriate permissions to upload anyway
        $permission = $this->mUpload->isAllowed( $user );
 
        if ( $permission !== true ) {
            if ( !$user->isLoggedIn() ) {
                $this->dieUsageMsg( [ 'mustbeloggedin', 'upload' ] );
            }
 
            $this->dieUsageMsg( 'badaccess-groups' );
        }
 
        // Check blocks
        if ( $user->isBlocked() ) {
            $this->dieBlocked( $user->getBlock() );
        }
 
        // Global blocks
        if ( $user->isBlockedGlobally() ) {
            $this->dieBlocked( $user->getGlobalBlock() );
        }
    }
 
    protected function verifyUpload() {
        $verification = $this->mUpload->verifyUpload();
        if ( $verification['status'] === UploadBase::OK ) {
            return;
        }
 
        $this->checkVerification( $verification );
    }
 
    protected function checkVerification( array $verification ) {
        // @todo Move them to ApiBase's message map
        switch ( $verification['status'] ) {
            // Recoverable errors
            case UploadBase::MIN_LENGTH_PARTNAME:
                $this->dieRecoverableError( 'filename-tooshort', 'filename' );
                break;
            case UploadBase::ILLEGAL_FILENAME:
                $this->dieRecoverableError( 'illegal-filename', 'filename',
                    [ 'filename' => $verification['filtered'] ] );
                break;
            case UploadBase::FILENAME_TOO_LONG:
                $this->dieRecoverableError( 'filename-toolong', 'filename' );
                break;
            case UploadBase::FILETYPE_MISSING:
                $this->dieRecoverableError( 'filetype-missing', 'filename' );
                break;
            case UploadBase::WINDOWS_NONASCII_FILENAME:
                $this->dieRecoverableError( 'windows-nonascii-filename', 'filename' );
                break;
 
            // Unrecoverable errors
            case UploadBase::EMPTY_FILE:
                $this->dieUsage( 'The file you submitted was empty', 'empty-file' );
                break;
            case UploadBase::FILE_TOO_LARGE:
                $this->dieUsage( 'The file you submitted was too large', 'file-too-large' );
                break;
 
            case UploadBase::FILETYPE_BADTYPE:
                $extradata = [
                    'filetype' => $verification['finalExt'],
                    'allowed' => array_values( array_unique( $this->getConfig()->get( 'FileExtensions' ) ) )
                ];
                ApiResult::setIndexedTagName( $extradata['allowed'], 'ext' );
 
                $msg = 'Filetype not permitted: ';
                if ( isset( $verification['blacklistedExt'] ) ) {
                    $msg .= implode( ', ', $verification['blacklistedExt'] );
                    $extradata['blacklisted'] = array_values( $verification['blacklistedExt'] );
                    ApiResult::setIndexedTagName( $extradata['blacklisted'], 'ext' );
                } else {
                    $msg .= $verification['finalExt'];
                }
                $this->dieUsage( $msg, 'filetype-banned', 0, $extradata );
                break;
            case UploadBase::VERIFICATION_ERROR:
                $parsed = $this->parseMsg( $verification['details'] );
                $info = "This file did not pass file verification: {$parsed['info']}";
                if ( $verification['details'][0] instanceof IApiMessage ) {
                    $code = $parsed['code'];
                } else {
                    // For backwards-compatibility, all of the errors from UploadBase::verifyFile() are
                    // reported as 'verification-error', and the real error code is reported in 'details'.
                    $code = 'verification-error';
                }
                if ( $verification['details'][0] instanceof IApiMessage ) {
                    $msg = $verification['details'][0];
                    $details = array_merge( [ $msg->getKey() ], $msg->getParams() );
                } else {
                    $details = $verification['details'];
                }
                ApiResult::setIndexedTagName( $details, 'detail' );
                $data = [ 'details' => $details ];
                if ( isset( $parsed['data'] ) ) {
                    $data = array_merge( $data, $parsed['data'] );
                }
 
                $this->dieUsage( $info, $code, 0, $data );
                break;
            case UploadBase::HOOK_ABORTED:
                if ( is_array( $verification['error'] ) ) {
                    $params = $verification['error'];
                } elseif ( $verification['error'] !== '' ) {
                    $params = [ $verification['error'] ];
                } else {
                    $params = [ 'hookaborted' ];
                }
                $key = array_shift( $params );
                $msg = $this->msg( $key, $params )->inLanguage( 'en' )->useDatabase( false )->text();
                $this->dieUsage( $msg, 'hookaborted', 0, [ 'details' => $verification['error'] ] );
                break;
            default:
                $this->dieUsage( 'An unknown error occurred', 'unknown-error',
                    0, [ 'details' => [ 'code' => $verification['status'] ] ] );
                break;
        }
    }
 
    protected function getApiWarnings() {
        $warnings = $this->mUpload->checkWarnings();
 
        return $this->transformWarnings( $warnings );
    }
 
    protected function transformWarnings( $warnings ) {
        if ( $warnings ) {
            // Add indices
            ApiResult::setIndexedTagName( $warnings, 'warning' );
 
            if ( isset( $warnings['duplicate'] ) ) {
                $dupes = [];
                foreach ( $warnings['duplicate'] as $dupe ) {
                    $dupes[] = $dupe->getName();
                }
                ApiResult::setIndexedTagName( $dupes, 'duplicate' );
                $warnings['duplicate'] = $dupes;
            }
 
            if ( isset( $warnings['exists'] ) ) {
                $warning = $warnings['exists'];
                unset( $warnings['exists'] );
                $localFile = isset( $warning['normalizedFile'] )
                    ? $warning['normalizedFile']
                    : $warning['file'];
                $warnings[$warning['warning']] = $localFile->getName();
            }
 
            if ( isset( $warnings['no-change'] ) ) {
                $file = $warnings['no-change'];
                unset( $warnings['no-change'] );
 
                $warnings['nochange'] = [
                    'timestamp' => wfTimestamp( TS_ISO_8601, $file->getTimestamp() )
                ];
            }
 
            if ( isset( $warnings['duplicate-version'] ) ) {
                $dupes = [];
                foreach ( $warnings['duplicate-version'] as $dupe ) {
                    $dupes[] = [
                        'timestamp' => wfTimestamp( TS_ISO_8601, $dupe->getTimestamp() )
                    ];
                }
                unset( $warnings['duplicate-version'] );
 
                ApiResult::setIndexedTagName( $dupes, 'ver' );
                $warnings['duplicateversions'] = $dupes;
            }
        }
 
        return $warnings;
    }
 
    protected function handleStashException( $exceptionType, $message ) {
        switch ( $exceptionType ) {
            case 'UploadStashFileNotFoundException':
                return [
                    'Could not find the file in the stash: ' . $message,
                    'stashedfilenotfound'
                ];
            case 'UploadStashBadPathException':
                return [
                    'File key of improper format or otherwise invalid: ' . $message,
                    'stashpathinvalid'
                ];
            case 'UploadStashFileException':
                return [
                    'Could not store upload in the stash: ' . $message,
                    'stashfilestorage'
                ];
            case 'UploadStashZeroLengthFileException':
                return [
                    'File is of zero length, and could not be stored in the stash: ' .
                        $message,
                    'stashzerolength'
                ];
            case 'UploadStashNotLoggedInException':
                return [ 'Not logged in: ' . $message, 'stashnotloggedin' ];
            case 'UploadStashWrongOwnerException':
                return [ 'Wrong owner: ' . $message, 'stashwrongowner' ];
            case 'UploadStashNoSuchKeyException':
                return [ 'No such filekey: ' . $message, 'stashnosuchfilekey' ];
            default:
                return [ $exceptionType . ': ' . $message, 'stasherror' ];
        }
    }
 
    protected function performUpload( $warnings ) {
        // Use comment as initial page text by default
        if ( is_null( $this->mParams['text'] ) ) {
            $this->mParams['text'] = $this->mParams['comment'];
        }
 
        $file = $this->mUpload->getLocalFile();
 
        // For preferences mode, we want to watch if 'watchdefault' is set,
        // or if the *file* doesn't exist, and either 'watchuploads' or
        // 'watchcreations' is set. But getWatchlistValue()'s automatic
        // handling checks if the *title* exists or not, so we need to check
        // all three preferences manually.
        $watch = $this->getWatchlistValue(
            $this->mParams['watchlist'], $file->getTitle(), 'watchdefault'
        );
 
        if ( !$watch && $this->mParams['watchlist'] == 'preferences' && !$file->exists() ) {
            $watch = (
                $this->getWatchlistValue( 'preferences', $file->getTitle(), 'watchuploads' ) ||
                $this->getWatchlistValue( 'preferences', $file->getTitle(), 'watchcreations' )
            );
        }
 
        // Deprecated parameters
        if ( $this->mParams['watch'] ) {
            $watch = true;
        }
 
        if ( $this->mParams['tags'] ) {
            $status = ChangeTags::canAddTagsAccompanyingChange( $this->mParams['tags'], $this->getUser() );
            if ( !$status->isOK() ) {
                $this->dieStatus( $status );
            }
        }
 
        // No errors, no warnings: do the upload
        if ( $this->mParams['async'] ) {
            $progress = UploadBase::getSessionStatus( $this->getUser(), $this->mParams['filekey'] );
            if ( $progress && $progress['result'] === 'Poll' ) {
                $this->dieUsage( 'Upload from stash already in progress.', 'publishfailed' );
            }
            UploadBase::setSessionStatus(
                $this->getUser(),
                $this->mParams['filekey'],
                [ 'result' => 'Poll', 'stage' => 'queued', 'status' => Status::newGood() ]
            );
            JobQueueGroup::singleton()->push( new PublishStashedFileJob(
                Title::makeTitle( NS_FILE, $this->mParams['filename'] ),
                [
                    'filename' => $this->mParams['filename'],
                    'filekey' => $this->mParams['filekey'],
                    'comment' => $this->mParams['comment'],
                    'tags' => $this->mParams['tags'],
                    'text' => $this->mParams['text'],
                    'watch' => $watch,
                    'session' => $this->getContext()->exportSession()
                ]
            ) );
            $result['result'] = 'Poll';
            $result['stage'] = 'queued';
        } else {
            $status = $this->mUpload->performUpload( $this->mParams['comment'],
                $this->mParams['text'], $watch, $this->getUser(), $this->mParams['tags'] );
 
            if ( !$status->isGood() ) {
                // Is there really no better way to do this?
                $errors = $status->getErrorsByType( 'error' );
                $msg = array_merge( [ $errors[0]['message'] ], $errors[0]['params'] );
                $data = $status->getErrorsArray();
                ApiResult::setIndexedTagName( $data, 'error' );
                // For backwards-compatibility, we use the 'internal-error' fallback key and merge $data
                // into the root of the response (rather than something sane like [ 'details' => $data ]).
                $this->dieRecoverableError( $msg, null, $data, 'internal-error' );
            }
            $result['result'] = 'Success';
        }
 
        $result['filename'] = $file->getName();
        if ( $warnings && count( $warnings ) > 0 ) {
            $result['warnings'] = $warnings;
        }
 
        return $result;
    }
 
    public function mustBePosted() {
        return true;
    }
 
    public function isWriteMode() {
        return true;
    }
 
    public function getAllowedParams() {
        $params = [
            'filename' => [
                ApiBase::PARAM_TYPE => 'string',
            ],
            'comment' => [
                ApiBase::PARAM_DFLT => ''
            ],
            'tags' => [
                ApiBase::PARAM_TYPE => 'tags',
                ApiBase::PARAM_ISMULTI => true,
            ],
            'text' => [
                ApiBase::PARAM_TYPE => 'text',
            ],
            'watch' => [
                ApiBase::PARAM_DFLT => false,
                ApiBase::PARAM_DEPRECATED => true,
            ],
            'watchlist' => [
                ApiBase::PARAM_DFLT => 'preferences',
                ApiBase::PARAM_TYPE => [
                    'watch',
                    'preferences',
                    'nochange'
                ],
            ],
            'ignorewarnings' => false,
            'file' => [
                ApiBase::PARAM_TYPE => 'upload',
            ],
            'url' => null,
            'filekey' => null,
            'sessionkey' => [
                ApiBase::PARAM_DEPRECATED => true,
            ],
            'stash' => false,
 
            'filesize' => [
                ApiBase::PARAM_TYPE => 'integer',
                ApiBase::PARAM_MIN => 0,
                ApiBase::PARAM_MAX => UploadBase::getMaxUploadSize(),
            ],
            'offset' => [
                ApiBase::PARAM_TYPE => 'integer',
                ApiBase::PARAM_MIN => 0,
            ],
            'chunk' => [
                ApiBase::PARAM_TYPE => 'upload',
            ],
 
            'async' => false,
            'checkstatus' => false,
        ];
 
        return $params;
    }
 
    public function needsToken() {
        return 'csrf';
    }
 
    protected function getExamplesMessages() {
        return [
            'action=upload&filename=Wiki.png' .
                '&url=http%3A//upload.wikimedia.org/wikipedia/en/b/bc/Wiki.png&token=123ABC'
                => 'apihelp-upload-example-url',
            'action=upload&filename=Wiki.png&filekey=filekey&ignorewarnings=1&token=123ABC'
                => 'apihelp-upload-example-filekey',
        ];
    }
 
    public function getHelpUrls() {
        return 'https://www.mediawiki.org/wiki/API:Upload';
    }
}