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->dieWithError( '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->dieDebug( __METHOD__, 'No upload module set' );
            }
        } catch ( UploadStashException $e ) { // XXX: don't spam exception log
            $this->dieStatus( $this->handleStashException( $e ) );
        }
 
        // First check permission to upload
        $this->checkPermissions( $user );
 
        // Fetch the file (usually a no-op)
        $status = $this->mUpload->fetchFile();
        if ( !$status->isGood() ) {
            $this->dieStatus( $status );
        }
 
        // Check if the uploaded file is sane
        if ( $this->mParams['chunk'] ) {
            $maxSize = UploadBase::getMaxUploadSize();
            if ( $this->mParams['filesize'] > $maxSize ) {
                $this->dieWithError( 'file-too-large' );
            }
            if ( !$this->mUpload->getTitle() ) {
                $this->dieWithError( 'illegal-filename' );
            }
        } 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, 'filename' );
            }
        }
 
        // Get the result based on the current upload context:
        try {
            $result = $this->getContextResult();
        } catch ( UploadStashException $e ) { // XXX: don't spam exception log
            $this->dieStatus( $this->handleStashException( $e ) );
        }
        $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).
        // @phan-suppress-next-line PhanTypeArraySuspiciousNullable False positive
        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->dieWithError( 'apierror-ratelimited' );
        }
 
        // 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;
    }
 
    public static function getMinUploadChunkSize( Config $config ) {
        $configured = $config->get( 'MinUploadChunkSize' );
 
        // Leave some room for other POST parameters
        $postMax = (
            wfShorthandToInteger(
                ini_get( 'post_max_size' ),
                PHP_INT_MAX
            ) ?: PHP_INT_MAX
        ) - 1024;
 
        // Ensure the minimum chunk size is less than PHP upload limits
        // or the maximum upload size.
        return min(
            $configured,
            UploadBase::getMaxUploadSize( 'file' ),
            UploadBase::getMaxPhpUploadSize(),
            $postMax
        );
    }
 
    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 = self::getMinUploadChunkSize( $this->getConfig() );
 
        // Sanity check sizing
        if ( $totalSoFar > $this->mParams['filesize'] ) {
            $this->dieWithError( 'apierror-invalid-chunk' );
        }
 
        // Enforce minimum chunk size
        if ( $totalSoFar != $this->mParams['filesize'] && $chunkSize < $minChunkSize ) {
            $this->dieWithError( [ 'apierror-chunk-too-small', Message::numParam( $minChunkSize ) ] );
        }
 
        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->dieWithError( 'apierror-stashfailed-nosession', 'stashfailed' );
            } elseif ( $progress['result'] !== 'Continue' || $progress['stage'] !== 'uploading' ) {
                $this->dieWithError( 'apierror-stashfailed-complete', '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 ApiMessage( 'apierror-stashinvalidfile', 'stashfailed' ) );
            }
        } catch ( Exception $e ) {
            $debugMessage = 'Stashing temporary file failed: ' . get_class( $e ) . ' ' . $e->getMessage();
            wfDebug( __METHOD__ . ' ' . $debugMessage . "\n" );
            $status = Status::newFatal( $this->getErrorFormatter()->getMessageFromException(
                $e, [ 'wrap' => new ApiMessage( 'apierror-stashexception', '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" );
        }
 
        // Bad status
        if ( $failureMode !== 'optional' ) {
            $this->dieStatus( $status );
        } else {
            $data['stasherrors'] = $this->getErrorFormatter()->arrayFromStatus( $status );
            return null;
        }
    }
 
    private function dieRecoverableError( $errors, $parameter = null ) {
        $this->performStash( 'optional', $data );
 
        if ( $parameter ) {
            $data['invalidparameter'] = $parameter;
        }
 
        $sv = StatusValue::newGood();
        foreach ( $errors as $error ) {
            $msg = ApiMessage::create( $error );
            $msg->setApiData( $msg->getApiData() + $data );
            $sv->fatal( $msg );
        }
        $this->dieStatus( $sv );
    }
 
    public function dieStatusWithCode( $status, $overrideCode, $moreExtraData = null ) {
        $sv = StatusValue::newGood();
        foreach ( $status->getErrors() as $error ) {
            $msg = ApiMessage::create( $error, $overrideCode );
            if ( $moreExtraData ) {
                $msg->setApiData( $msg->getApiData() + $moreExtraData );
            }
            $sv->fatal( $msg );
        }
        $this->dieStatus( $sv );
    }
 
    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 ) {
                $this->dieWithError( 'apierror-upload-missingresult', 'missingresult' );
            } elseif ( !$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 ( $this->mParams['filename'] === null ) {
            $this->dieWithError( [ 'apierror-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->dieWithError( 'apierror-upload-filekeynotallowed', 'filekeynotallowed' );
                }
 
                // handle new chunk
                $this->mUpload->continueChunks(
                    $this->mParams['filename'],
                    $this->mParams['filekey'],
                    $request->getUpload( 'chunk' )
                );
            } else {
                if ( $this->mParams['offset'] !== 0 ) {
                    $this->dieWithError( 'apierror-upload-filekeyneeded', 'filekeyneeded' );
                }
 
                // 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->dieWithError( 'apierror-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'] ) ) {
            // Can't async upload directly from a POSTed file, we'd have to
            // stash the file and then queue the publish job. The user should
            // just submit the two API queries to perform those two steps.
            if ( $this->mParams['async'] ) {
                $this->dieWithError( 'apierror-cannot-async-upload-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->dieWithError( 'copyuploaddisabled' );
            }
 
            if ( !UploadFromUrl::isAllowedHost( $this->mParams['url'] ) ) {
                $this->dieWithError( 'apierror-copyuploadbaddomain' );
            }
 
            if ( !UploadFromUrl::isAllowedUrl( $this->mParams['url'] ) ) {
                $this->dieWithError( 'apierror-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->dieWithError( [ 'apierror-mustbeloggedin', $this->msg( 'action-upload' ) ] );
            }
 
            $this->dieStatus( User::newFatalPermissionDeniedStatus( $permission ) );
        }
 
        // Check blocks
        if ( $user->isBlockedFromUpload() ) {
            $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 ) {
        switch ( $verification['status'] ) {
            // Recoverable errors
            case UploadBase::MIN_LENGTH_PARTNAME:
                $this->dieRecoverableError( [ 'filename-tooshort' ], 'filename' );
                break;
            case UploadBase::ILLEGAL_FILENAME:
                $this->dieRecoverableError(
                    [ ApiMessage::create(
                        'illegal-filename', null, [ 'filename' => $verification['filtered'] ]
                    ) ], 'filename'
                );
                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->dieWithError( 'empty-file' );
                break;
            case UploadBase::FILE_TOO_LARGE:
                $this->dieWithError( 'file-too-large' );
                break;
 
            case UploadBase::FILETYPE_BADTYPE:
                $extradata = [
                    'filetype' => $verification['finalExt'],
                    'allowed' => array_values( array_unique( $this->getConfig()->get( 'FileExtensions' ) ) )
                ];
                $extensions = array_unique( $this->getConfig()->get( 'FileExtensions' ) );
                $msg = [
                    'filetype-banned-type',
                    null, // filled in below
                    Message::listParam( $extensions, 'comma' ),
                    count( $extensions ),
                    null, // filled in below
                ];
                ApiResult::setIndexedTagName( $extradata['allowed'], 'ext' );
 
                if ( isset( $verification['blacklistedExt'] ) ) {
                    $msg[1] = Message::listParam( $verification['blacklistedExt'], 'comma' );
                    $msg[4] = count( $verification['blacklistedExt'] );
                    $extradata['blacklisted'] = array_values( $verification['blacklistedExt'] );
                    ApiResult::setIndexedTagName( $extradata['blacklisted'], 'ext' );
                } else {
                    $msg[1] = $verification['finalExt'];
                    $msg[4] = 1;
                }
 
                $this->dieWithError( $msg, 'filetype-banned', $extradata );
                break;
 
            case UploadBase::VERIFICATION_ERROR:
                $msg = ApiMessage::create( $verification['details'], 'verification-error' );
                if ( $verification['details'][0] instanceof MessageSpecifier ) {
                    $details = array_merge( [ $msg->getKey() ], $msg->getParams() );
                } else {
                    $details = $verification['details'];
                }
                ApiResult::setIndexedTagName( $details, 'detail' );
                $msg->setApiData( $msg->getApiData() + [ 'details' => $details ] );
                // @phan-suppress-next-line PhanTypeMismatchArgument
                $this->dieWithError( $msg );
                break;
 
            case UploadBase::HOOK_ABORTED:
                $msg = $verification['error'] === '' ? 'hookaborted' : $verification['error'];
                $this->dieWithError( $msg, 'hookaborted', [ 'details' => $verification['error'] ] );
                break;
            default:
                $this->dieWithError( 'apierror-unknownerror-nocode', 'unknown-error',
                    [ 'details' => [ 'code' => $verification['status'] ] ] );
                break;
        }
    }
 
    protected function getApiWarnings() {
        $warnings = UploadBase::makeWarningsSerializable(
            $this->mUpload->checkWarnings( $this->getUser() )
        );
 
        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['fileName'];
                }
                ApiResult::setIndexedTagName( $dupes, 'duplicate' );
                $warnings['duplicate'] = $dupes;
            }
 
            if ( isset( $warnings['exists'] ) ) {
                $warning = $warnings['exists'];
                unset( $warnings['exists'] );
                $localFile = $warning['normalizedFile'] ?? $warning['file'];
                $warnings[$warning['warning']] = $localFile['fileName'];
            }
 
            if ( isset( $warnings['no-change'] ) ) {
                $file = $warnings['no-change'];
                unset( $warnings['no-change'] );
 
                $warnings['nochange'] = [
                    'timestamp' => wfTimestamp( TS_ISO_8601, $file['timestamp'] )
                ];
            }
 
            if ( isset( $warnings['duplicate-version'] ) ) {
                $dupes = [];
                foreach ( $warnings['duplicate-version'] as $dupe ) {
                    $dupes[] = [
                        'timestamp' => wfTimestamp( TS_ISO_8601, $dupe['timestamp'] )
                    ];
                }
                unset( $warnings['duplicate-version'] );
 
                ApiResult::setIndexedTagName( $dupes, 'ver' );
                $warnings['duplicateversions'] = $dupes;
            }
        }
 
        return $warnings;
    }
 
    protected function handleStashException( $e ) {
        switch ( get_class( $e ) ) {
            case UploadStashFileNotFoundException::class:
                $wrap = 'apierror-stashedfilenotfound';
                break;
            case UploadStashBadPathException::class:
                $wrap = 'apierror-stashpathinvalid';
                break;
            case UploadStashFileException::class:
                $wrap = 'apierror-stashfilestorage';
                break;
            case UploadStashZeroLengthFileException::class:
                $wrap = 'apierror-stashzerolength';
                break;
            case UploadStashNotLoggedInException::class:
                return StatusValue::newFatal( ApiMessage::create(
                    [ 'apierror-mustbeloggedin', $this->msg( 'action-upload' ) ], 'stashnotloggedin'
                ) );
            case UploadStashWrongOwnerException::class:
                $wrap = 'apierror-stashwrongowner';
                break;
            case UploadStashNoSuchKeyException::class:
                $wrap = 'apierror-stashnosuchfilekey';
                break;
            default:
                $wrap = [ 'uploadstash-exception', get_class( $e ) ];
                break;
        }
        return StatusValue::newFatal(
            $this->getErrorFormatter()->getMessageFromException( $e, [ 'wrap' => $wrap ] )
        );
    }
 
    protected function performUpload( $warnings ) {
        // Use comment as initial page text by default
        if ( $this->mParams['text'] === null ) {
            $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
        $result = [];
        if ( $this->mParams['async'] ) {
            $progress = UploadBase::getSessionStatus( $this->getUser(), $this->mParams['filekey'] );
            if ( $progress && $progress['result'] === 'Poll' ) {
                $this->dieWithError( 'apierror-upload-inprogress', '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() ) {
                $this->dieRecoverableError( $status->getErrors() );
            }
            $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/Special:MyLanguage/API:Upload';
    }
}