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

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

use MediaWiki\Api\ApiResult;
use MediaWiki\Api\ApiUpload;
use MediaWiki\Context\RequestContext;
use MediaWiki\HookContainer\HookRunner;
use MediaWiki\HookContainer\ProtectedHookAccessorTrait;
use MediaWiki\Logger\LoggerFactory;
use MediaWiki\MainConfigNames;
use MediaWiki\MediaWikiServices;
use MediaWiki\Message\Message;
use MediaWiki\Parser\Sanitizer;
use MediaWiki\Permissions\Authority;
use MediaWiki\Permissions\PermissionStatus;
use MediaWiki\Request\WebRequest;
use MediaWiki\Shell\Shell;
use MediaWiki\Status\Status;
use MediaWiki\Title\Title;
use MediaWiki\User\User;
use MediaWiki\User\UserIdentity;
use Wikimedia\AtEase\AtEase;
use Wikimedia\FileBackend\FileBackend;
use Wikimedia\FileBackend\FSFile\FSFile;
use Wikimedia\FileBackend\FSFile\TempFSFile;
use Wikimedia\Mime\XmlTypeCheck;
use Wikimedia\ObjectCache\BagOStuff;
use Wikimedia\Rdbms\IDBAccessObject;

/**
 * @defgroup Upload Upload related
 */

/**
 * @ingroup Upload
 *
 * UploadBase and subclasses are the backend of MediaWiki's file uploads.
 * The frontends are formed by ApiUpload and SpecialUpload.
 *
 * @stable to extend
 *
 * @author Brooke Vibber
 * @author Bryan Tong Minh
 * @author Michael Dale
 */
abstract class UploadBase {
        use ProtectedHookAccessorTrait;

        /** @var string|null Local file system path to the file to upload (or a local copy) */
        protected $mTempPath;
        /** @var TempFSFile|null Wrapper to handle deleting the temp file */
        protected $tempFileObj;
        /** @var string|null */
        protected $mDesiredDestName;
        /** @var string|null */
        protected $mDestName;
        /** @var bool|null */
        protected $mRemoveTempFile;
        /** @var string|null */
        protected $mSourceType;
        /** @var Title|false|null */
        protected $mTitle = false;
        /** @var int */
        protected $mTitleError = 0;
        /** @var string|null */
        protected $mFilteredName;
        /** @var string|null */
        protected $mFinalExtension;
        /** @var LocalFile|null */
        protected $mLocalFile;
        /** @var UploadStashFile|null */
        protected $mStashFile;
        /** @var int|null */
        protected $mFileSize;
        /** @var array|null */
        protected $mFileProps;
        /** @var string[] */
        protected $mBlackListedExtensions;
        /** @var bool|null */
        protected $mJavaDetected;
        /** @var string|false */
        protected $mSVGNSError;

        private const SAFE_XML_ENCONDINGS = [
                'UTF-8',
                'US-ASCII',
                'ISO-8859-1',
                'ISO-8859-2',
                'UTF-16',
                'UTF-32',
                'WINDOWS-1250',
                'WINDOWS-1251',
                'WINDOWS-1252',
                'WINDOWS-1253',
                'WINDOWS-1254',
                'WINDOWS-1255',
                'WINDOWS-1256',
                'WINDOWS-1257',
                'WINDOWS-1258',
        ];

        public const SUCCESS = 0;
        public const OK = 0;
        public const EMPTY_FILE = 3;
        public const MIN_LENGTH_PARTNAME = 4;
        public const ILLEGAL_FILENAME = 5;
        public const OVERWRITE_EXISTING_FILE = 7; # Not used anymore; handled by verifyTitlePermissions()
        public const FILETYPE_MISSING = 8;
        public const FILETYPE_BADTYPE = 9;
        public const VERIFICATION_ERROR = 10;
        public const HOOK_ABORTED = 11;
        public const FILE_TOO_LARGE = 12;
        public const WINDOWS_NONASCII_FILENAME = 13;
        public const FILENAME_TOO_LONG = 14;

        private const CODE_TO_STATUS = [
                self::EMPTY_FILE => 'empty-file',
                self::FILE_TOO_LARGE => 'file-too-large',
                self::FILETYPE_MISSING => 'filetype-missing',
                self::FILETYPE_BADTYPE => 'filetype-banned',
                self::MIN_LENGTH_PARTNAME => 'filename-tooshort',
                self::ILLEGAL_FILENAME => 'illegal-filename',
                self::OVERWRITE_EXISTING_FILE => 'overwrite',
                self::VERIFICATION_ERROR => 'verification-error',
                self::HOOK_ABORTED => 'hookaborted',
                self::WINDOWS_NONASCII_FILENAME => 'windows-nonascii-filename',
                self::FILENAME_TOO_LONG => 'filename-toolong',
        ];

        /**
         * @param int $error
         * @return string
         */
        public function getVerificationErrorCode( $error ) {
                return self::CODE_TO_STATUS[$error] ?? 'unknown-error';
        }

        /**
         * Returns true if uploads are enabled.
         * Can be override by subclasses.
         * @stable to override
         * @return bool
         */
        public static function isEnabled() {
                $enableUploads = MediaWikiServices::getInstance()->getMainConfig()->get( MainConfigNames::EnableUploads );

                return $enableUploads && wfIniGetBool( 'file_uploads' );
        }

        /**
         * Returns true if the user can use this upload module or else a string
         * identifying the missing permission.
         * Can be overridden by subclasses.
         *
         * @param Authority $performer
         * @return bool|string
         */
        public static function isAllowed( Authority $performer ) {
                foreach ( [ 'upload', 'edit' ] as $permission ) {
                        if ( !$performer->isAllowed( $permission ) ) {
                                return $permission;
                        }
                }

                return true;
        }

        /**
         * Returns true if the user has surpassed the upload rate limit, false otherwise.
         *
         * @deprecated since 1.41, use verifyTitlePermissions() instead.
         * Rate limit checks are now implicit in permission checks.
         *
         * @param User $user
         * @return bool
         */
        public static function isThrottled( $user ) {
                wfDeprecated( __METHOD__, '1.41' );
                return $user->pingLimiter( 'upload' );
        }

        /** @var string[] Upload handlers. Should probably just be a configuration variable. */
        private static $uploadHandlers = [ 'Stash', 'File', 'Url' ];

        /**
         * Create a form of UploadBase depending on wpSourceType and initializes it.
         *
         * @param WebRequest &$request
         * @param string|null $type
         * @return null|self
         */
        public static function createFromRequest( &$request, $type = null ) {
                $type = $type ?: $request->getVal( 'wpSourceType', 'File' );

                if ( !$type ) {
                        return null;
                }

                // Get the upload class
                $type = ucfirst( $type );

                // Give hooks the chance to handle this request
                /** @var self|null $className */
                $className = null;
                ( new HookRunner( MediaWikiServices::getInstance()->getHookContainer() ) )
                        // @phan-suppress-next-line PhanTypeMismatchArgument Type mismatch on pass-by-ref args
                        ->onUploadCreateFromRequest( $type, $className );
                if ( $className === null ) {
                        $className = 'UploadFrom' . $type;
                        wfDebug( __METHOD__ . ": class name: $className" );
                        if ( !in_array( $type, self::$uploadHandlers ) ) {
                                return null;
                        }
                }

                if ( !$className::isEnabled() || !$className::isValidRequest( $request ) ) {
                        return null;
                }

                /** @var self $handler */
                $handler = new $className;

                $handler->initializeFromRequest( $request );

                return $handler;
        }

        /**
         * Check whether a request if valid for this handler.
         * @param WebRequest $request
         * @return bool
         */
        public static function isValidRequest( $request ) {
                return false;
        }

        /**
         * Get the desired destination name.
         * @return string|null
         */
        public function getDesiredDestName() {
                return $this->mDesiredDestName;
        }

        /**
         * @stable to call
         */
        public function __construct() {
        }

        /**
         * Returns the upload type. Should be overridden by child classes.
         *
         * @since 1.18
         * @stable to override
         * @return string|null
         */
        public function getSourceType() {
                return null;
        }

        /**
         * @param string $name The desired destination name
         * @param string|null $tempPath Callers should make sure this is not a storage path
         * @param int|null $fileSize
         * @param bool $removeTempFile (false) remove the temporary file?
         */
        public function initializePathInfo( $name, $tempPath, $fileSize, $removeTempFile = false ) {
                $this->mDesiredDestName = $name;
                if ( FileBackend::isStoragePath( $tempPath ) ) {
                        throw new InvalidArgumentException( __METHOD__ . " given storage path `$tempPath`." );
                }

                $this->setTempFile( $tempPath, $fileSize );
                $this->mRemoveTempFile = $removeTempFile;
        }

        /**
         * Initialize from a WebRequest. Override this in a subclass.
         *
         * @param WebRequest &$request
         */
        abstract public function initializeFromRequest( &$request );

        /**
         * @param string|null $tempPath File system path to temporary file containing the upload
         * @param int|null $fileSize
         */
        protected function setTempFile( $tempPath, $fileSize = null ) {
                $this->mTempPath = $tempPath ?? '';
                $this->mFileSize = $fileSize ?: null;
                $this->mFileProps = null;
                if ( strlen( $this->mTempPath ) && file_exists( $this->mTempPath ) ) {
                        $this->tempFileObj = new TempFSFile( $this->mTempPath );
                        if ( !$fileSize ) {
                                $this->mFileSize = filesize( $this->mTempPath );
                        }
                } else {
                        $this->tempFileObj = null;
                }
        }

        /**
         * Fetch the file. Usually a no-op.
         * @stable to override
         * @return Status
         */
        public function fetchFile() {
                return Status::newGood();
        }

        /**
         * Perform checks to see if the file can be fetched. Usually a no-op.
         * @stable to override
         * @return Status
         */
        public function canFetchFile() {
                return Status::newGood();
        }

        /**
         * Return true if the file is empty.
         * @return bool
         */
        public function isEmptyFile() {
                return !$this->mFileSize;
        }

        /**
         * Return the file size.
         * @return int
         */
        public function getFileSize() {
                return $this->mFileSize;
        }

        /**
         * Get the base 36 SHA1 of the file.
         * @stable to override
         * @return string|false
         */
        public function getTempFileSha1Base36() {
                // Use cached version if we already have it.
                if ( $this->mFileProps && is_string( $this->mFileProps['sha1'] ) ) {
                        return $this->mFileProps['sha1'];
                }
                return FSFile::getSha1Base36FromPath( $this->mTempPath );
        }

        /**
         * @param string $srcPath The source path
         * @return string|false The real path if it was a virtual URL Returns false on failure
         */
        public function getRealPath( $srcPath ) {
                $repo = MediaWikiServices::getInstance()->getRepoGroup()->getLocalRepo();
                if ( FileRepo::isVirtualUrl( $srcPath ) ) {
                        /** @todo Just make uploads work with storage paths UploadFromStash
                         *  loads files via virtual URLs.
                         */
                        $tmpFile = $repo->getLocalCopy( $srcPath );
                        if ( $tmpFile ) {
                                $tmpFile->bind( $this ); // keep alive with $this
                        }
                        $path = $tmpFile ? $tmpFile->getPath() : false;
                } else {
                        $path = $srcPath;
                }

                return $path;
        }

        /**
         * Verify whether the upload is sensible.
         *
         * Return a status array representing the outcome of the verification.
         * Possible keys are:
         * - 'status': set to self::OK in case of success, or to one of the error constants defined in
         *   this class in case of failure
         * - 'max': set to the maximum allowed file size ($wgMaxUploadSize) if the upload is too large
         * - 'details': set to error details if the file type is valid but contents are corrupt
         * - 'filtered': set to the sanitized file name if the requested file name is invalid
         * - 'finalExt': set to the file's file extension if it is not an allowed file extension
         * - 'blacklistedExt': set to the list of disallowed file extensions if the current file extension
         *    is not allowed for uploads and the list is not empty
         *
         * @stable to override
         * @return mixed[] array representing the result of the verification
         */
        public function verifyUpload() {
                /**
                 * If there was no filename or a zero size given, give up quick.
                 */
                if ( $this->isEmptyFile() ) {
                        return [ 'status' => self::EMPTY_FILE ];
                }

                /**
                 * Honor $wgMaxUploadSize
                 */
                $maxSize = self::getMaxUploadSize( $this->getSourceType() );
                if ( $this->mFileSize > $maxSize ) {
                        return [
                                'status' => self::FILE_TOO_LARGE,
                                'max' => $maxSize,
                        ];
                }

                /**
                 * Look at the contents of the file; if we can recognize the
                 * type, but it's corrupt or data of the wrong type, we should
                 * probably not accept it.
                 */
                $verification = $this->verifyFile();
                if ( $verification !== true ) {
                        return [
                                'status' => self::VERIFICATION_ERROR,
                                'details' => $verification
                        ];
                }

                /**
                 * Make sure this file can be created
                 */
                $result = $this->validateName();
                if ( $result !== true ) {
                        return $result;
                }

                return [ 'status' => self::OK ];
        }

        /**
         * Verify that the name is valid and, if necessary, that we can overwrite
         *
         * @return array|bool True if valid, otherwise an array with 'status'
         * and other keys
         */
        public function validateName() {
                $nt = $this->getTitle();
                if ( $nt === null ) {
                        $result = [ 'status' => $this->mTitleError ];
                        if ( $this->mTitleError === self::ILLEGAL_FILENAME ) {
                                $result['filtered'] = $this->mFilteredName;
                        }
                        if ( $this->mTitleError === self::FILETYPE_BADTYPE ) {
                                $result['finalExt'] = $this->mFinalExtension;
                                if ( count( $this->mBlackListedExtensions ) ) {
                                        $result['blacklistedExt'] = $this->mBlackListedExtensions;
                                }
                        }

                        return $result;
                }
                $this->mDestName = $this->getLocalFile()->getName();

                return true;
        }

        /**
         * Verify the MIME type.
         *
         * @note Only checks that it is not an evil MIME.
         *  The "does it have the correct file extension given its MIME type?" check is in verifyFile.
         * @param string $mime Representing the MIME
         * @return array|bool True if the file is verified, an array otherwise
         */
        protected function verifyMimeType( $mime ) {
                $verifyMimeType = MediaWikiServices::getInstance()->getMainConfig()->get( MainConfigNames::VerifyMimeType );
                if ( $verifyMimeType ) {
                        wfDebug( "mime: <$mime> extension: <{$this->mFinalExtension}>" );
                        $mimeTypeExclusions = MediaWikiServices::getInstance()->getMainConfig()
                                ->get( MainConfigNames::MimeTypeExclusions );
                        if ( self::checkFileExtension( $mime, $mimeTypeExclusions ) ) {
                                return [ 'filetype-badmime', $mime ];
                        }
                }

                return true;
        }

        /**
         * Verifies that it's ok to include the uploaded file
         *
         * @return array|true True of the file is verified, array otherwise.
         */
        protected function verifyFile() {
                $config = MediaWikiServices::getInstance()->getMainConfig();
                $verifyMimeType = $config->get( MainConfigNames::VerifyMimeType );
                $disableUploadScriptChecks = $config->get( MainConfigNames::DisableUploadScriptChecks );
                $status = $this->verifyPartialFile();
                if ( $status !== true ) {
                        return $status;
                }

                // Calculating props calculates the sha1 which is expensive.
                // reuse props if we already have them
                if ( !is_array( $this->mFileProps ) ) {
                        $mwProps = new MWFileProps( MediaWikiServices::getInstance()->getMimeAnalyzer() );
                        $this->mFileProps = $mwProps->getPropsFromPath( $this->mTempPath, $this->mFinalExtension );
                }
                $mime = $this->mFileProps['mime'];

                if ( $verifyMimeType ) {
                        # XXX: Missing extension will be caught by validateName() via getTitle()
                        if ( (string)$this->mFinalExtension !== '' &&
                                !self::verifyExtension( $mime, $this->mFinalExtension )
                        ) {
                                return [ 'filetype-mime-mismatch', $this->mFinalExtension, $mime ];
                        }
                }

                # check for htmlish code and javascript
                if ( !$disableUploadScriptChecks ) {
                        if ( $this->mFinalExtension === 'svg' || $mime === 'image/svg+xml' ) {
                                $svgStatus = $this->detectScriptInSvg( $this->mTempPath, false );
                                if ( $svgStatus !== false ) {
                                        return $svgStatus;
                                }
                        }
                }

                $handler = MediaHandler::getHandler( $mime );
                if ( $handler ) {
                        $handlerStatus = $handler->verifyUpload( $this->mTempPath );
                        if ( !$handlerStatus->isOK() ) {
                                $errors = $handlerStatus->getErrorsArray();

                                return reset( $errors );
                        }
                }

                $error = true;
                $this->getHookRunner()->onUploadVerifyFile( $this, $mime, $error );
                if ( $error !== true ) {
                        if ( !is_array( $error ) ) {
                                $error = [ $error ];
                        }
                        return $error;
                }

                wfDebug( __METHOD__ . ": all clear; passing." );

                return true;
        }

        /**
         * A verification routine suitable for partial files
         *
         * Runs the deny list checks, but not any checks that may
         * assume the entire file is present.
         *
         * @return array|true True, if the file is valid, else an array with error message key.
         * @phan-return non-empty-array|true
         */
        protected function verifyPartialFile() {
                $config = MediaWikiServices::getInstance()->getMainConfig();
                $disableUploadScriptChecks = $config->get( MainConfigNames::DisableUploadScriptChecks );
                # getTitle() sets some internal parameters like $this->mFinalExtension
                $this->getTitle();

                // Calculating props calculates the sha1 which is expensive.
                // reuse props if we already have them (e.g. During stashed upload)
                if ( !is_array( $this->mFileProps ) ) {
                        $mwProps = new MWFileProps( MediaWikiServices::getInstance()->getMimeAnalyzer() );
                        $this->mFileProps = $mwProps->getPropsFromPath( $this->mTempPath, $this->mFinalExtension );
                }

                # check MIME type, if desired
                $mime = $this->mFileProps['file-mime'];
                $status = $this->verifyMimeType( $mime );
                if ( $status !== true ) {
                        return $status;
                }

                # check for htmlish code and javascript
                if ( !$disableUploadScriptChecks ) {
                        if ( self::detectScript( $this->mTempPath, $mime, $this->mFinalExtension ) ) {
                                return [ 'uploadscripted' ];
                        }
                        if ( $this->mFinalExtension === 'svg' || $mime === 'image/svg+xml' ) {
                                $svgStatus = $this->detectScriptInSvg( $this->mTempPath, true );
                                if ( $svgStatus !== false ) {
                                        return $svgStatus;
                                }
                        }
                }

                # Scan the uploaded file for viruses
                $virus = self::detectVirus( $this->mTempPath );
                if ( $virus ) {
                        return [ 'uploadvirus', $virus ];
                }

                return true;
        }

        /**
         * Callback for ZipDirectoryReader to detect Java class files.
         *
         * @param array $entry
         */
        public function zipEntryCallback( $entry ) {
                $names = [ $entry['name'] ];

                // If there is a null character, cut off the name at it, because JDK's
                // ZIP_GetEntry() uses strcmp() if the name hashes match. If a file name
                // were constructed which had ".class\0" followed by a string chosen to
                // make the hash collide with the truncated name, that file could be
                // returned in response to a request for the .class file.
                $nullPos = strpos( $entry['name'], "\000" );
                if ( $nullPos !== false ) {
                        $names[] = substr( $entry['name'], 0, $nullPos );
                }

                // If there is a trailing slash in the file name, we have to strip it,
                // because that's what ZIP_GetEntry() does.
                if ( preg_grep( '!\.class/?$!', $names ) ) {
                        $this->mJavaDetected = true;
                }
        }

        /**
         * Alias for verifyTitlePermissions. The function was originally
         * 'verifyPermissions', but that suggests it's checking the user, when it's
         * really checking the title + user combination.
         *
         * @param Authority $performer to verify the permissions against
         * @return array|bool An array as returned by getPermissionErrors or true
         *   in case the user has proper permissions.
         */
        public function verifyPermissions( Authority $performer ) {
                return $this->verifyTitlePermissions( $performer );
        }

        /**
         * Check whether the user can edit, upload and create the image. This
         * checks only against the current title; if it returns errors, it may
         * very well be that another title will not give errors. Therefore
         * isAllowed() should be called as well for generic is-user-blocked or
         * can-user-upload checking.
         *
         * @param Authority $performer to verify the permissions against
         * @return array|bool An array as returned by getPermissionErrors or true
         *   in case the user has proper permissions.
         */
        public function verifyTitlePermissions( Authority $performer ) {
                /**
                 * If the image is protected, non-sysop users won't be able
                 * to modify it by uploading a new revision.
                 */
                $nt = $this->getTitle();
                if ( $nt === null ) {
                        return true;
                }

                $status = PermissionStatus::newEmpty();
                $performer->authorizeWrite( 'edit', $nt, $status );
                $performer->authorizeWrite( 'upload', $nt, $status );
                if ( !$status->isGood() ) {
                        return $status->toLegacyErrorArray();
                }

                $overwriteError = $this->checkOverwrite( $performer );
                if ( $overwriteError !== true ) {
                        return [ $overwriteError ];
                }

                return true;
        }

        /**
         * Check for non fatal problems with the file.
         *
         * This should not assume that mTempPath is set.
         *
         * @param User|null $user Accepted since 1.35
         *
         * @return mixed[] Array of warnings
         */
        public function checkWarnings( $user = null ) {
                if ( $user === null ) {
                        // TODO check uses and hard deprecate
                        $user = RequestContext::getMain()->getUser();
                }

                $warnings = [];

                $localFile = $this->getLocalFile();
                $localFile->load( IDBAccessObject::READ_LATEST );
                $filename = $localFile->getName();
                $hash = $this->getTempFileSha1Base36();

                $badFileName = $this->checkBadFileName( $filename, $this->mDesiredDestName );
                if ( $badFileName !== null ) {
                        $warnings['badfilename'] = $badFileName;
                }

                $unwantedFileExtensionDetails = $this->checkUnwantedFileExtensions( (string)$this->mFinalExtension );
                if ( $unwantedFileExtensionDetails !== null ) {
                        $warnings['filetype-unwanted-type'] = $unwantedFileExtensionDetails;
                }

                $fileSizeWarnings = $this->checkFileSize( $this->mFileSize );
                if ( $fileSizeWarnings ) {
                        $warnings = array_merge( $warnings, $fileSizeWarnings );
                }

                $localFileExistsWarnings = $this->checkLocalFileExists( $localFile, $hash );
                if ( $localFileExistsWarnings ) {
                        $warnings = array_merge( $warnings, $localFileExistsWarnings );
                }

                if ( $this->checkLocalFileWasDeleted( $localFile ) ) {
                        $warnings['was-deleted'] = $filename;
                }

                // If a file with the same name exists locally then the local file has already been tested
                // for duplication of content
                $ignoreLocalDupes = isset( $warnings['exists'] );
                $dupes = $this->checkAgainstExistingDupes( $hash, $ignoreLocalDupes );
                if ( $dupes ) {
                        $warnings['duplicate'] = $dupes;
                }

                $archivedDupes = $this->checkAgainstArchiveDupes( $hash, $user );
                if ( $archivedDupes !== null ) {
                        $warnings['duplicate-archive'] = $archivedDupes;
                }

                return $warnings;
        }

        /**
         * Convert the warnings array returned by checkWarnings() to something that
         * can be serialized. File objects will be converted to an associative array
         * with the following keys:
         *
         *   - fileName: The name of the file
         *   - timestamp: The upload timestamp
         *
         * @param mixed[] $warnings
         * @return mixed[]
         */
        public static function makeWarningsSerializable( $warnings ) {
                array_walk_recursive( $warnings, static function ( &$param, $key ) {
                        if ( $param instanceof File ) {
                                $param = [
                                        'fileName' => $param->getName(),
                                        'timestamp' => $param->getTimestamp()
                                ];
                        } elseif ( is_object( $param ) ) {
                                throw new InvalidArgumentException(
                                        'UploadBase::makeWarningsSerializable: ' .
                                        'Unexpected object of class ' . get_class( $param ) );
                        }
                } );
                return $warnings;
        }

        /**
         * Convert the serialized warnings array created by makeWarningsSerializable()
         * back to the output of checkWarnings().
         *
         * @param mixed[] $warnings
         * @return mixed[]
         */
        public static function unserializeWarnings( $warnings ) {
                foreach ( $warnings as $key => $value ) {
                        if ( is_array( $value ) ) {
                                if ( isset( $value['fileName'] ) && isset( $value['timestamp'] ) ) {
                                        $warnings[$key] = MediaWikiServices::getInstance()->getRepoGroup()->findFile(
                                                $value['fileName'],
                                                [ 'time' => $value['timestamp'] ]
                                        );
                                } else {
                                        $warnings[$key] = self::unserializeWarnings( $value );
                                }
                        }
                }
                return $warnings;
        }

        /**
         * Check whether the resulting filename is different from the desired one,
         * but ignore things like ucfirst() and spaces/underscore things
         *
         * @param string $filename
         * @param string $desiredFileName
         *
         * @return string|null String that was determined to be bad or null if the filename is okay
         */
        private function checkBadFileName( $filename, $desiredFileName ) {
                $comparableName = str_replace( ' ', '_', $desiredFileName );
                $comparableName = Title::capitalize( $comparableName, NS_FILE );

                if ( $desiredFileName != $filename && $comparableName != $filename ) {
                        return $filename;
                }

                return null;
        }

        /**
         * @param string $fileExtension The file extension to check
         *
         * @return array|null array with the following keys:
         *                    0 => string The final extension being used
         *                    1 => string[] The extensions that are allowed
         *                    2 => int The number of extensions that are allowed.
         */
        private function checkUnwantedFileExtensions( $fileExtension ) {
                $checkFileExtensions = MediaWikiServices::getInstance()->getMainConfig()
                        ->get( MainConfigNames::CheckFileExtensions );
                $fileExtensions = MediaWikiServices::getInstance()->getMainConfig()->get( MainConfigNames::FileExtensions );
                if ( $checkFileExtensions ) {
                        $extensions = array_unique( $fileExtensions );
                        if ( !self::checkFileExtension( $fileExtension, $extensions ) ) {
                                return [
                                        $fileExtension,
                                        Message::listParam( $extensions, 'comma' ),
                                        count( $extensions )
                                ];
                        }
                }

                return null;
        }

        /**
         * @param int $fileSize
         *
         * @return array warnings
         */
        private function checkFileSize( $fileSize ) {
                $uploadSizeWarning = MediaWikiServices::getInstance()->getMainConfig()
                        ->get( MainConfigNames::UploadSizeWarning );

                $warnings = [];

                if ( $uploadSizeWarning && ( $fileSize > $uploadSizeWarning ) ) {
                        $warnings['large-file'] = [
                                Message::sizeParam( $uploadSizeWarning ),
                                Message::sizeParam( $fileSize ),
                        ];
                }

                if ( $fileSize == 0 ) {
                        $warnings['empty-file'] = true;
                }

                return $warnings;
        }

        /**
         * @param LocalFile $localFile
         * @param string|false $hash sha1 hash of the file to check
         *
         * @return array warnings
         */
        private function checkLocalFileExists( LocalFile $localFile, $hash ) {
                $warnings = [];

                $exists = self::getExistsWarning( $localFile );
                if ( $exists !== false ) {
                        $warnings['exists'] = $exists;

                        // check if file is an exact duplicate of current file version
                        if ( $hash !== false && $hash === $localFile->getSha1() ) {
                                $warnings['no-change'] = $localFile;
                        }

                        // check if file is an exact duplicate of older versions of this file
                        $history = $localFile->getHistory();
                        foreach ( $history as $oldFile ) {
                                if ( $hash === $oldFile->getSha1() ) {
                                        $warnings['duplicate-version'][] = $oldFile;
                                }
                        }
                }

                return $warnings;
        }

        private function checkLocalFileWasDeleted( LocalFile $localFile ) {
                return $localFile->wasDeleted() && !$localFile->exists();
        }

        /**
         * @param string|false $hash sha1 hash of the file to check
         * @param bool $ignoreLocalDupes True to ignore local duplicates
         *
         * @return File[] Duplicate files, if found.
         */
        private function checkAgainstExistingDupes( $hash, $ignoreLocalDupes ) {
                if ( $hash === false ) {
                        return [];
                }
                $dupes = MediaWikiServices::getInstance()->getRepoGroup()->findBySha1( $hash );
                $title = $this->getTitle();
                foreach ( $dupes as $key => $dupe ) {
                        if (
                                ( $dupe instanceof LocalFile ) &&
                                $ignoreLocalDupes &&
                                $title->equals( $dupe->getTitle() )
                        ) {
                                unset( $dupes[$key] );
                        }
                }

                return $dupes;
        }

        /**
         * @param string|false $hash sha1 hash of the file to check
         * @param Authority $performer
         *
         * @return string|null Name of the dupe or empty string if discovered (depending on visibility)
         *                     null if the check discovered no dupes.
         */
        private function checkAgainstArchiveDupes( $hash, Authority $performer ) {
                if ( $hash === false ) {
                        return null;
                }
                $archivedFile = new ArchivedFile( null, 0, '', $hash );
                if ( $archivedFile->getID() > 0 ) {
                        if ( $archivedFile->userCan( File::DELETED_FILE, $performer ) ) {
                                return $archivedFile->getName();
                        }
                        return '';
                }

                return null;
        }

        /**
         * Really perform the upload. Stores the file in the local repo, watches
         * if necessary and runs the UploadComplete hook.
         *
         * @param string $comment
         * @param string|false $pageText
         * @param bool $watch Whether the file page should be added to user's watchlist.
         *   (This doesn't check $user's permissions.)
         * @param User $user
         * @param string[] $tags Change tags to add to the log entry and page revision.
         *   (This doesn't check $user's permissions.)
         * @param string|null $watchlistExpiry Optional watchlist expiry timestamp in any format
         *   acceptable to wfTimestamp().
         * @return Status Indicating the whether the upload succeeded.
         *
         * @since 1.35 Accepts $watchlistExpiry parameter.
         */
        public function performUpload(
                $comment, $pageText, $watch, $user, $tags = [], ?string $watchlistExpiry = null
        ) {
                $this->getLocalFile()->load( IDBAccessObject::READ_LATEST );
                $props = $this->mFileProps;

                $error = null;
                $this->getHookRunner()->onUploadVerifyUpload( $this, $user, $props, $comment, $pageText, $error );
                if ( $error ) {
                        if ( !is_array( $error ) ) {
                                $error = [ $error ];
                        }
                        return Status::newFatal( ...$error );
                }

                $status = $this->getLocalFile()->upload(
                        $this->mTempPath,
                        $comment,
                        $pageText !== false ? $pageText : '',
                        File::DELETE_SOURCE,
                        $props,
                        false,
                        $user,
                        $tags
                );

                if ( $status->isGood() ) {
                        if ( $watch ) {
                                MediaWikiServices::getInstance()->getWatchlistManager()->addWatchIgnoringRights(
                                        $user,
                                        $this->getLocalFile()->getTitle(),
                                        $watchlistExpiry
                                );
                        }
                        $this->getHookRunner()->onUploadComplete( $this );

                        $this->postProcessUpload();
                }

                return $status;
        }

        /**
         * Perform extra steps after a successful upload.
         *
         * @stable to override
         * @since  1.25
         */
        public function postProcessUpload() {
        }

        /**
         * Returns the title of the file to be uploaded. Sets mTitleError in case
         * the name was illegal.
         *
         * @return Title|null The title of the file or null in case the name was illegal
         */
        public function getTitle() {
                if ( $this->mTitle !== false ) {
                        return $this->mTitle;
                }
                if ( !is_string( $this->mDesiredDestName ) ) {
                        $this->mTitleError = self::ILLEGAL_FILENAME;
                        $this->mTitle = null;

                        return $this->mTitle;
                }
                /* Assume that if a user specified File:Something.jpg, this is an error
                 * and that the namespace prefix needs to be stripped of.
                 */
                $title = Title::newFromText( $this->mDesiredDestName );
                if ( $title && $title->getNamespace() === NS_FILE ) {
                        $this->mFilteredName = $title->getDBkey();
                } else {
                        $this->mFilteredName = $this->mDesiredDestName;
                }

                # oi_archive_name is max 255 bytes, which include a timestamp and an
                # exclamation mark, so restrict file name to 240 bytes.
                if ( strlen( $this->mFilteredName ) > 240 ) {
                        $this->mTitleError = self::FILENAME_TOO_LONG;
                        $this->mTitle = null;

                        return $this->mTitle;
                }

                /**
                 * Chop off any directories in the given filename. Then
                 * filter out illegal characters, and try to make a legible name
                 * out of it. We'll strip some silently that Title would die on.
                 */
                $this->mFilteredName = wfStripIllegalFilenameChars( $this->mFilteredName );
                /* Normalize to title form before we do any further processing */
                $nt = Title::makeTitleSafe( NS_FILE, $this->mFilteredName );
                if ( $nt === null ) {
                        $this->mTitleError = self::ILLEGAL_FILENAME;
                        $this->mTitle = null;

                        return $this->mTitle;
                }
                $this->mFilteredName = $nt->getDBkey();

                /**
                 * We'll want to prevent against *any* 'extension', and use
                 * only the final one for the allow list.
                 */
                [ $partname, $ext ] = self::splitExtensions( $this->mFilteredName );

                if ( $ext !== [] ) {
                        $this->mFinalExtension = trim( end( $ext ) );
                } else {
                        $this->mFinalExtension = '';

                        // No extension, try guessing one from the temporary file
                        // FIXME: Sometimes we mTempPath isn't set yet here, possibly due to an unrealistic
                        // or incomplete test case in UploadBaseTest (T272328)
                        if ( $this->mTempPath !== null ) {
                                $magic = MediaWikiServices::getInstance()->getMimeAnalyzer();
                                $mime = $magic->guessMimeType( $this->mTempPath );
                                if ( $mime !== 'unknown/unknown' ) {
                                        # Get a space separated list of extensions
                                        $mimeExt = $magic->getExtensionFromMimeTypeOrNull( $mime );
                                        if ( $mimeExt !== null ) {
                                                # Set the extension to the canonical extension
                                                $this->mFinalExtension = $mimeExt;

                                                # Fix up the other variables
                                                $this->mFilteredName .= ".{$this->mFinalExtension}";
                                                $nt = Title::makeTitleSafe( NS_FILE, $this->mFilteredName );
                                                $ext = [ $this->mFinalExtension ];
                                        }
                                }
                        }
                }

                // Don't allow users to override the list of prohibited file extensions (check file extension)
                $config = MediaWikiServices::getInstance()->getMainConfig();
                $checkFileExtensions = $config->get( MainConfigNames::CheckFileExtensions );
                $strictFileExtensions = $config->get( MainConfigNames::StrictFileExtensions );
                $fileExtensions = $config->get( MainConfigNames::FileExtensions );
                $prohibitedFileExtensions = $config->get( MainConfigNames::ProhibitedFileExtensions );

                $badList = self::checkFileExtensionList( $ext, $prohibitedFileExtensions );

                if ( $this->mFinalExtension == '' ) {
                        $this->mTitleError = self::FILETYPE_MISSING;
                        $this->mTitle = null;

                        return $this->mTitle;
                }

                if ( $badList ||
                        ( $checkFileExtensions && $strictFileExtensions &&
                                !self::checkFileExtension( $this->mFinalExtension, $fileExtensions ) )
                ) {
                        $this->mBlackListedExtensions = $badList;
                        $this->mTitleError = self::FILETYPE_BADTYPE;
                        $this->mTitle = null;

                        return $this->mTitle;
                }

                // Windows may be broken with special characters, see T3780
                if ( !preg_match( '/^[\x0-\x7f]*$/', $nt->getText() )
                        && !MediaWikiServices::getInstance()->getRepoGroup()
                                ->getLocalRepo()->backendSupportsUnicodePaths()
                ) {
                        $this->mTitleError = self::WINDOWS_NONASCII_FILENAME;
                        $this->mTitle = null;

                        return $this->mTitle;
                }

                # If there was more than one file "extension", reassemble the base
                # filename to prevent bogus complaints about length
                if ( count( $ext ) > 1 ) {
                        $iterations = count( $ext ) - 1;
                        for ( $i = 0; $i < $iterations; $i++ ) {
                                $partname .= '.' . $ext[$i];
                        }
                }

                if ( strlen( $partname ) < 1 ) {
                        $this->mTitleError = self::MIN_LENGTH_PARTNAME;
                        $this->mTitle = null;

                        return $this->mTitle;
                }

                $this->mTitle = $nt;

                return $this->mTitle;
        }

        /**
         * Return the local file and initializes if necessary.
         *
         * @stable to override
         * @return LocalFile|null
         */
        public function getLocalFile() {
                if ( $this->mLocalFile === null ) {
                        $nt = $this->getTitle();
                        $this->mLocalFile = $nt === null
                                ? null
                                : MediaWikiServices::getInstance()->getRepoGroup()->getLocalRepo()->newFile( $nt );
                }

                return $this->mLocalFile;
        }

        /**
         * @return UploadStashFile|null
         */
        public function getStashFile() {
                return $this->mStashFile;
        }

        /**
         * Like stashFile(), but respects extensions' wishes to prevent the stashing. verifyUpload() must
         * be called before calling this method (unless $isPartial is true).
         *
         * Upload stash exceptions are also caught and converted to an error status.
         *
         * @since 1.28
         * @stable to override
         * @param User $user
         * @param bool $isPartial Pass `true` if this is a part of a chunked upload (not a complete file).
         * @return Status If successful, value is an UploadStashFile instance
         */
        public function tryStashFile( User $user, $isPartial = false ) {
                if ( !$isPartial ) {
                        $error = $this->runUploadStashFileHook( $user );
                        if ( $error ) {
                                return Status::newFatal( ...$error );
                        }
                }
                try {
                        $file = $this->doStashFile( $user );
                        return Status::newGood( $file );
                } catch ( UploadStashException $e ) {
                        return Status::newFatal( 'uploadstash-exception', get_class( $e ), $e->getMessage() );
                }
        }

        /**
         * @param User $user
         * @return array|null Error message and parameters, null if there's no error
         */
        protected function runUploadStashFileHook( User $user ) {
                $props = $this->mFileProps;
                $error = null;
                $this->getHookRunner()->onUploadStashFile( $this, $user, $props, $error );
                if ( $error && !is_array( $error ) ) {
                        $error = [ $error ];
                }
                return $error;
        }

        /**
         * Implementation for stashFile() and tryStashFile().
         *
         * @stable to override
         * @param User|null $user
         * @return UploadStashFile Stashed file
         */
        protected function doStashFile( ?User $user = null ) {
                $stash = MediaWikiServices::getInstance()->getRepoGroup()
                        ->getLocalRepo()->getUploadStash( $user );
                $file = $stash->stashFile( $this->mTempPath, $this->getSourceType(), $this->mFileProps );
                $this->mStashFile = $file;

                return $file;
        }

        /**
         * If we've modified the upload file, then we need to manually remove it
         * on exit to clean up.
         */
        public function cleanupTempFile() {
                if ( $this->mRemoveTempFile && $this->tempFileObj ) {
                        // Delete when all relevant TempFSFile handles go out of scope
                        wfDebug( __METHOD__ . ": Marked temporary file '{$this->mTempPath}' for removal" );
                        $this->tempFileObj->autocollect();
                }
        }

        /**
         * @return string|null
         */
        public function getTempPath() {
                return $this->mTempPath;
        }

        /**
         * Split a file into a base name and all dot-delimited 'extensions'
         * on the end. Some web server configurations will fall back to
         * earlier pseudo-'extensions' to determine type and execute
         * scripts, so we need to check them all.
         *
         * @param string $filename
         * @return array [ string, string[] ]
         */
        public static function splitExtensions( $filename ) {
                $bits = explode( '.', $filename );
                $basename = array_shift( $bits );

                return [ $basename, $bits ];
        }

        /**
         * Perform case-insensitive match against a list of file extensions.
         *
         * @param string $ext File extension
         * @param array $list
         * @return bool Returns true if the extension is in the list.
         */
        public static function checkFileExtension( $ext, $list ) {
                return in_array( strtolower( $ext ?? '' ), $list, true );
        }

        /**
         * Perform case-insensitive match against a list of file extensions.
         * Returns an array of matching extensions.
         *
         * @param string[] $ext File extensions
         * @param string[] $list
         * @return string[]
         */
        public static function checkFileExtensionList( $ext, $list ) {
                return array_intersect( array_map( 'strtolower', $ext ), $list );
        }

        /**
         * Checks if the MIME type of the uploaded file matches the file extension.
         *
         * @param string $mime The MIME type of the uploaded file
         * @param string $extension The filename extension that the file is to be served with
         * @return bool
         */
        public static function verifyExtension( $mime, $extension ) {
                $magic = MediaWikiServices::getInstance()->getMimeAnalyzer();

                if ( !$mime || $mime === 'unknown' || $mime === 'unknown/unknown' ) {
                        if ( !$magic->isRecognizableExtension( $extension ) ) {
                                wfDebug( __METHOD__ . ": passing file with unknown detected mime type; " .
                                        "unrecognized extension '$extension', can't verify" );

                                return true;
                        }

                        wfDebug( __METHOD__ . ": rejecting file with unknown detected mime type; " .
                                "recognized extension '$extension', so probably invalid file" );
                        return false;
                }

                $match = $magic->isMatchingExtension( $extension, $mime );

                if ( $match === null ) {
                        if ( $magic->getMimeTypesFromExtension( $extension ) !== [] ) {
                                wfDebug( __METHOD__ . ": No extension known for $mime, but we know a mime for $extension" );

                                return false;
                        }

                        wfDebug( __METHOD__ . ": no file extension known for mime type $mime, passing file" );
                        return true;
                }

                if ( $match ) {
                        wfDebug( __METHOD__ . ": mime type $mime matches extension $extension, passing file" );

                        /** @todo If it's a bitmap, make sure PHP or ImageMagick resp. can handle it! */
                        return true;
                }

                wfDebug( __METHOD__
                        . ": mime type $mime mismatches file extension $extension, rejecting file" );

                return false;
        }

        /**
         * Heuristic for detecting files that *could* contain JavaScript instructions or
         * things that may look like HTML to a browser and are thus
         * potentially harmful. The present implementation will produce false
         * positives in some situations.
         *
         * @param string|null $file Pathname to the temporary upload file
         * @param string $mime The MIME type of the file
         * @param string|null $extension The extension of the file
         * @return bool True if the file contains something looking like embedded scripts
         */
        public static function detectScript( $file, $mime, $extension ) {
                # ugly hack: for text files, always look at the entire file.
                # For binary field, just check the first K.

                if ( str_starts_with( $mime ?? '', 'text/' ) ) {
                        $chunk = file_get_contents( $file );
                } else {
                        $fp = fopen( $file, 'rb' );
                        if ( !$fp ) {
                                return false;
                        }
                        $chunk = fread( $fp, 1024 );
                        fclose( $fp );
                }

                $chunk = strtolower( $chunk );

                if ( !$chunk ) {
                        return false;
                }

                # decode from UTF-16 if needed (could be used for obfuscation).
                if ( str_starts_with( $chunk, "\xfe\xff" ) ) {
                        $enc = 'UTF-16BE';
                } elseif ( str_starts_with( $chunk, "\xff\xfe" ) ) {
                        $enc = 'UTF-16LE';
                } else {
                        $enc = null;
                }

                if ( $enc !== null ) {
                        $chunk = iconv( $enc, "ASCII//IGNORE", $chunk );
                }

                $chunk = trim( $chunk );

                /** @todo FIXME: Convert from UTF-16 if necessary! */
                wfDebug( __METHOD__ . ": checking for embedded scripts and HTML stuff" );

                # check for HTML doctype
                if ( preg_match( "/<!DOCTYPE *X?HTML/i", $chunk ) ) {
                        return true;
                }

                // Some browsers will interpret obscure xml encodings as UTF-8, while
                // PHP/expat will interpret the given encoding in the xml declaration (T49304)
                if ( $extension === 'svg' || str_starts_with( $mime ?? '', 'image/svg' ) ) {
                        if ( self::checkXMLEncodingMissmatch( $file ) ) {
                                return true;
                        }
                }

                // Quick check for HTML heuristics in old IE and Safari.
                //
                // The exact heuristics IE uses are checked separately via verifyMimeType(), so we
                // don't need them all here as it can cause many false positives.
                //
                // Check for `<script` and such still to forbid script tags and embedded HTML in SVG:
                $tags = [
                        '<body',
                        '<head',
                        '<html', # also in safari
                        '<script', # also in safari
                ];

                foreach ( $tags as $tag ) {
                        if ( strpos( $chunk, $tag ) !== false ) {
                                wfDebug( __METHOD__ . ": found something that may make it be mistaken for html: $tag" );

                                return true;
                        }
                }

                /*
                 * look for JavaScript
                 */

                # resolve entity-refs to look at attributes. may be harsh on big files... cache result?
                $chunk = Sanitizer::decodeCharReferences( $chunk );

                # look for script-types
                if ( preg_match( '!type\s*=\s*[\'"]?\s*(?:\w*/)?(?:ecma|java)!im', $chunk ) ) {
                        wfDebug( __METHOD__ . ": found script types" );

                        return true;
                }

                # look for html-style script-urls
                if ( preg_match( '!(?:href|src|data)\s*=\s*[\'"]?\s*(?:ecma|java)script:!im', $chunk ) ) {
                        wfDebug( __METHOD__ . ": found html-style script urls" );

                        return true;
                }

                # look for css-style script-urls
                if ( preg_match( '!url\s*\(\s*[\'"]?\s*(?:ecma|java)script:!im', $chunk ) ) {
                        wfDebug( __METHOD__ . ": found css-style script urls" );

                        return true;
                }

                wfDebug( __METHOD__ . ": no scripts found" );

                return false;
        }

        /**
         * Check an allowed list of xml encodings that are known not to be interpreted differently
         * by the server's xml parser (expat) and some common browsers.
         *
         * @param string $file Pathname to the temporary upload file
         * @return bool True if the file contains an encoding that could be misinterpreted
         */
        public static function checkXMLEncodingMissmatch( $file ) {
                // https://mimesniff.spec.whatwg.org/#resource-header says browsers
                // should read the first 1445 bytes. Do 4096 bytes for good measure.
                // XML Spec says XML declaration if present must be first thing in file
                // other than BOM
                $contents = file_get_contents( $file, false, null, 0, 4096 );
                $encodingRegex = '!encoding[ \t\n\r]*=[ \t\n\r]*[\'"](.*?)[\'"]!si';

                if ( preg_match( "!<\?xml\b(.*?)\?>!si", $contents, $matches ) ) {
                        if ( preg_match( $encodingRegex, $matches[1], $encMatch )
                                && !in_array( strtoupper( $encMatch[1] ), self::SAFE_XML_ENCONDINGS )
                        ) {
                                wfDebug( __METHOD__ . ": Found unsafe XML encoding '{$encMatch[1]}'" );

                                return true;
                        }
                } elseif ( preg_match( "!<\?xml\b!i", $contents ) ) {
                        // Start of XML declaration without an end in the first 4096 bytes
                        // bytes. There shouldn't be a legitimate reason for this to happen.
                        wfDebug( __METHOD__ . ": Unmatched XML declaration start" );

                        return true;
                } elseif ( str_starts_with( $contents, "\x4C\x6F\xA7\x94" ) ) {
                        // EBCDIC encoded XML
                        wfDebug( __METHOD__ . ": EBCDIC Encoded XML" );

                        return true;
                }

                // It's possible the file is encoded with multibyte encoding, so re-encode attempt to
                // detect the encoding in case it specifies an encoding not allowed in self::SAFE_XML_ENCONDINGS
                $attemptEncodings = [ 'UTF-16', 'UTF-16BE', 'UTF-32', 'UTF-32BE' ];
                foreach ( $attemptEncodings as $encoding ) {
                        AtEase::suppressWarnings();
                        $str = iconv( $encoding, 'UTF-8', $contents );
                        AtEase::restoreWarnings();
                        if ( $str != '' && preg_match( "!<\?xml\b(.*?)\?>!si", $str, $matches ) ) {
                                if ( preg_match( $encodingRegex, $matches[1], $encMatch )
                                        && !in_array( strtoupper( $encMatch[1] ), self::SAFE_XML_ENCONDINGS )
                                ) {
                                        wfDebug( __METHOD__ . ": Found unsafe XML encoding '{$encMatch[1]}'" );

                                        return true;
                                }
                        } elseif ( $str != '' && preg_match( "!<\?xml\b!i", $str ) ) {
                                // Start of XML declaration without an end in the first 4096 bytes
                                // bytes. There shouldn't be a legitimate reason for this to happen.
                                wfDebug( __METHOD__ . ": Unmatched XML declaration start" );

                                return true;
                        }
                }

                return false;
        }

        /**
         * @param string $filename
         * @param bool $partial
         * @return bool|array
         */
        protected function detectScriptInSvg( $filename, $partial ) {
                $this->mSVGNSError = false;
                $check = new XmlTypeCheck(
                        $filename,
                        [ $this, 'checkSvgScriptCallback' ],
                        true,
                        [
                                'processing_instruction_handler' => [ __CLASS__, 'checkSvgPICallback' ],
                                'external_dtd_handler' => [ __CLASS__, 'checkSvgExternalDTD' ],
                        ]
                );
                if ( $check->wellFormed !== true ) {
                        // Invalid xml (T60553)
                        // But only when non-partial (T67724)
                        return $partial ? false : [ 'uploadinvalidxml' ];
                }

                if ( $check->filterMatch ) {
                        if ( $this->mSVGNSError ) {
                                return [ 'uploadscriptednamespace', $this->mSVGNSError ];
                        }
                        return $check->filterMatchType;
                }

                return false;
        }

        /**
         * Callback to filter SVG Processing Instructions.
         *
         * @param string $target Processing instruction name
         * @param string $data Processing instruction attribute and value
         * @return bool|array
         */
        public static function checkSvgPICallback( $target, $data ) {
                // Don't allow external stylesheets (T59550)
                if ( preg_match( '/xml-stylesheet/i', $target ) ) {
                        return [ 'upload-scripted-pi-callback' ];
                }

                return false;
        }

        /**
         * Verify that DTD URLs referenced are only the standard DTDs.
         *
         * Browsers seem to ignore external DTDs.
         *
         * However, just to be on the safe side, only allow DTDs from the SVG standard.
         *
         * @param string $type PUBLIC or SYSTEM
         * @param string $publicId The well-known public identifier for the dtd
         * @param string $systemId The url for the external dtd
         * @return bool|array
         */
        public static function checkSvgExternalDTD( $type, $publicId, $systemId ) {
                // This doesn't include the XHTML+MathML+SVG doctype since we don't
                // allow XHTML anyway.
                static $allowedDTDs = [
                        'http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd',
                        'http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd',
                        'http://www.w3.org/Graphics/SVG/1.1/DTD/svg11-basic.dtd',
                        'http://www.w3.org/Graphics/SVG/1.1/DTD/svg11-tiny.dtd',
                        // https://phabricator.wikimedia.org/T168856
                        'http://www.w3.org/TR/2001/PR-SVG-20010719/DTD/svg10.dtd',
                ];
                if ( $type !== 'PUBLIC'
                        || !in_array( $systemId, $allowedDTDs )
                        || !str_starts_with( $publicId, "-//W3C//" )
                ) {
                        return [ 'upload-scripted-dtd' ];
                }
                return false;
        }

        /**
         * @todo Replace this with a allow list filter!
         * @param string $element
         * @param array $attribs
         * @param string|null $data
         * @return bool|array
         */
        public function checkSvgScriptCallback( $element, $attribs, $data = null ) {
                [ $namespace, $strippedElement ] = self::splitXmlNamespace( $element );

                // We specifically don't include:
                // http://www.w3.org/1999/xhtml (T62771)
                static $validNamespaces = [
                        '',
                        'adobe:ns:meta/',
                        'http://creativecommons.org/ns#',
                        'http://inkscape.sourceforge.net/dtd/sodipodi-0.dtd',
                        'http://ns.adobe.com/adobeillustrator/10.0/',
                        'http://ns.adobe.com/adobesvgviewerextensions/3.0/',
                        'http://ns.adobe.com/extensibility/1.0/',
                        'http://ns.adobe.com/flows/1.0/',
                        'http://ns.adobe.com/illustrator/1.0/',
                        'http://ns.adobe.com/imagereplacement/1.0/',
                        'http://ns.adobe.com/pdf/1.3/',
                        'http://ns.adobe.com/photoshop/1.0/',
                        'http://ns.adobe.com/saveforweb/1.0/',
                        'http://ns.adobe.com/variables/1.0/',
                        'http://ns.adobe.com/xap/1.0/',
                        'http://ns.adobe.com/xap/1.0/g/',
                        'http://ns.adobe.com/xap/1.0/g/img/',
                        'http://ns.adobe.com/xap/1.0/mm/',
                        'http://ns.adobe.com/xap/1.0/rights/',
                        'http://ns.adobe.com/xap/1.0/stype/dimensions#',
                        'http://ns.adobe.com/xap/1.0/stype/font#',
                        'http://ns.adobe.com/xap/1.0/stype/manifestitem#',
                        'http://ns.adobe.com/xap/1.0/stype/resourceevent#',
                        'http://ns.adobe.com/xap/1.0/stype/resourceref#',
                        'http://ns.adobe.com/xap/1.0/t/pg/',
                        'http://purl.org/dc/elements/1.1/',
                        'http://purl.org/dc/elements/1.1',
                        'http://schemas.microsoft.com/visio/2003/svgextensions/',
                        'http://sodipodi.sourceforge.net/dtd/sodipodi-0.dtd',
                        'http://taptrix.com/inkpad/svg_extensions',
                        'http://web.resource.org/cc/',
                        'http://www.freesoftware.fsf.org/bkchem/cdml',
                        'http://www.inkscape.org/namespaces/inkscape',
                        'http://www.opengis.net/gml',
                        'http://www.w3.org/1999/02/22-rdf-syntax-ns#',
                        'http://www.w3.org/2000/svg',
                        'http://www.w3.org/tr/rec-rdf-syntax/',
                        'http://www.w3.org/2000/01/rdf-schema#',
                        'http://www.w3.org/2000/02/svg/testsuite/description/', // https://phabricator.wikimedia.org/T278044
                ];

                // Inkscape mangles namespace definitions created by Adobe Illustrator.
                // This is nasty but harmless. (T144827)
                $isBuggyInkscape = preg_match( '/^&(#38;)*ns_[a-z_]+;$/', $namespace );

                if ( !( $isBuggyInkscape || in_array( $namespace, $validNamespaces ) ) ) {
                        wfDebug( __METHOD__ . ": Non-svg namespace '$namespace' in uploaded file." );
                        /** @todo Return a status object to a closure in XmlTypeCheck, for MW1.21+ */
                        $this->mSVGNSError = $namespace;

                        return true;
                }

                // check for elements that can contain javascript
                if ( $strippedElement === 'script' ) {
                        wfDebug( __METHOD__ . ": Found script element '$element' in uploaded file." );

                        return [ 'uploaded-script-svg', $strippedElement ];
                }

                // e.g., <svg xmlns="http://www.w3.org/2000/svg">
                //  <handler xmlns:ev="http://www.w3.org/2001/xml-events" ev:event="load">alert(1)</handler> </svg>
                if ( $strippedElement === 'handler' ) {
                        wfDebug( __METHOD__ . ": Found scriptable element '$element' in uploaded file." );

                        return [ 'uploaded-script-svg', $strippedElement ];
                }

                // SVG reported in Feb '12 that used xml:stylesheet to generate javascript block
                if ( $strippedElement === 'stylesheet' ) {
                        wfDebug( __METHOD__ . ": Found scriptable element '$element' in uploaded file." );

                        return [ 'uploaded-script-svg', $strippedElement ];
                }

                // Block iframes, in case they pass the namespace check
                if ( $strippedElement === 'iframe' ) {
                        wfDebug( __METHOD__ . ": iframe in uploaded file." );

                        return [ 'uploaded-script-svg', $strippedElement ];
                }

                // Check <style> css
                if ( $strippedElement === 'style'
                        && self::checkCssFragment( Sanitizer::normalizeCss( $data ) )
                ) {
                        wfDebug( __METHOD__ . ": hostile css in style element." );

                        return [ 'uploaded-hostile-svg' ];
                }

                static $cssAttrs = [ 'font', 'clip-path', 'fill', 'filter', 'marker',
                        'marker-end', 'marker-mid', 'marker-start', 'mask', 'stroke' ];

                foreach ( $attribs as $attrib => $value ) {
                        // If attributeNamespace is '', it is relative to its element's namespace
                        [ $attributeNamespace, $stripped ] = self::splitXmlNamespace( $attrib );
                        $value = strtolower( $value );

                        if ( !(
                                        // Inkscape element's have valid attribs that start with on and are safe, fail all others
                                        $namespace === 'http://www.inkscape.org/namespaces/inkscape' &&
                                        $attributeNamespace === ''
                                ) && str_starts_with( $stripped, 'on' )
                        ) {
                                wfDebug( __METHOD__
                                        . ": Found event-handler attribute '$attrib'='$value' in uploaded file." );

                                return [ 'uploaded-event-handler-on-svg', $attrib, $value ];
                        }

                        // Do not allow relative links, or unsafe url schemas.
                        // For <a> tags, only data:, http: and https: and same-document
                        // fragment links are allowed.
                        // For all other tags, only 'data:' and fragments (#) are allowed.
                        if (
                                $stripped === 'href'
                                && $value !== ''
                                && !str_starts_with( $value, 'data:' )
                                && !str_starts_with( $value, '#' )
                                && !( $strippedElement === 'a' && preg_match( '!^https?://!i', $value ) )
                        ) {
                                wfDebug( __METHOD__ . ": Found href attribute <$strippedElement "
                                        . "'$attrib'='$value' in uploaded file." );

                                return [ 'uploaded-href-attribute-svg', $strippedElement, $attrib, $value ];
                        }

                        // Only allow 'data:\' targets that should be safe.
                        // This prevents vectors like image/svg, text/xml, application/xml, and text/html, which can contain scripts
                        if ( $stripped === 'href' && strncasecmp( 'data:', $value, 5 ) === 0 ) {
                                // RFC2397 parameters.
                                // This is only slightly slower than (;[\w;]+)*.
                                // phpcs:ignore Generic.Files.LineLength
                                $parameters = '(?>;[a-zA-Z0-9\!#$&\'*+.^_`{|}~-]+=(?>[a-zA-Z0-9\!#$&\'*+.^_`{|}~-]+|"(?>[\0-\x0c\x0e-\x21\x23-\x5b\x5d-\x7f]+|\\\\[\0-\x7f])*"))*(?:;base64)?';

                                if ( !preg_match( "!^data:\s*image/(gif|jpeg|jpg|png)$parameters,!i", $value ) ) {
                                        wfDebug( __METHOD__ . ": Found href to allow listed data: uri "
                                                . "\"<$strippedElement '$attrib'='$value'...\" in uploaded file." );
                                        return [ 'uploaded-href-unsafe-target-svg', $strippedElement, $attrib, $value ];
                                }
                        }

                        // Change href with animate from (http://html5sec.org/#137).
                        if ( $stripped === 'attributename'
                                && $strippedElement === 'animate'
                                && $this->stripXmlNamespace( $value ) === 'href'
                        ) {
                                wfDebug( __METHOD__ . ": Found animate that might be changing href using from "
                                        . "\"<$strippedElement '$attrib'='$value'...\" in uploaded file." );

                                return [ 'uploaded-animate-svg', $strippedElement, $attrib, $value ];
                        }

                        // Use set/animate to add event-handler attribute to parent.
                        if ( ( $strippedElement === 'set' || $strippedElement === 'animate' )
                                && $stripped === 'attributename'
                                && str_starts_with( $value, 'on' )
                        ) {
                                wfDebug( __METHOD__ . ": Found svg setting event-handler attribute with "
                                        . "\"<$strippedElement $stripped='$value'...\" in uploaded file." );

                                return [ 'uploaded-setting-event-handler-svg', $strippedElement, $stripped, $value ];
                        }

                        // use set to add href attribute to parent element.
                        if ( $strippedElement === 'set'
                                && $stripped === 'attributename'
                                && str_contains( $value, 'href' )
                        ) {
                                wfDebug( __METHOD__ . ": Found svg setting href attribute '$value' in uploaded file." );

                                return [ 'uploaded-setting-href-svg' ];
                        }

                        // use set to add a remote / data / script target to an element.
                        if ( $strippedElement === 'set'
                                && $stripped === 'to'
                                && preg_match( '!(http|https|data|script):!im', $value )
                        ) {
                                wfDebug( __METHOD__ . ": Found svg setting attribute to '$value' in uploaded file." );

                                return [ 'uploaded-wrong-setting-svg', $value ];
                        }

                        // use handler attribute with remote / data / script.
                        if ( $stripped === 'handler' && preg_match( '!(http|https|data|script):!im', $value ) ) {
                                wfDebug( __METHOD__ . ": Found svg setting handler with remote/data/script "
                                        . "'$attrib'='$value' in uploaded file." );

                                return [ 'uploaded-setting-handler-svg', $attrib, $value ];
                        }

                        // use CSS styles to bring in remote code.
                        if ( $stripped === 'style'
                                && self::checkCssFragment( Sanitizer::normalizeCss( $value ) )
                        ) {
                                wfDebug( __METHOD__ . ": Found svg setting a style with "
                                        . "remote url '$attrib'='$value' in uploaded file." );
                                return [ 'uploaded-remote-url-svg', $attrib, $value ];
                        }

                        // Several attributes can include css, css character escaping isn't allowed.
                        if ( in_array( $stripped, $cssAttrs, true )
                                && self::checkCssFragment( $value )
                        ) {
                                wfDebug( __METHOD__ . ": Found svg setting a style with "
                                        . "remote url '$attrib'='$value' in uploaded file." );
                                return [ 'uploaded-remote-url-svg', $attrib, $value ];
                        }

                        // image filters can pull in url, which could be svg that executes scripts.
                        // Only allow url( "#foo" ).
                        // Do not allow url( http://example.com )
                        if ( $strippedElement === 'image'
                                && $stripped === 'filter'
                                && preg_match( '!url\s*\(\s*["\']?[^#]!im', $value )
                        ) {
                                wfDebug( __METHOD__ . ": Found image filter with url: "
                                        . "\"<$strippedElement $stripped='$value'...\" in uploaded file." );

                                return [ 'uploaded-image-filter-svg', $strippedElement, $stripped, $value ];
                        }
                }

                return false; // No scripts detected
        }

        /**
         * Check a block of CSS or CSS fragment for anything that looks like
         * it is bringing in remote code.
         * @param string $value a string of CSS
         * @return bool true if the CSS contains an illegal string, false if otherwise
         */
        private static function checkCssFragment( $value ) {
                # Forbid external stylesheets, for both reliability and to protect viewer's privacy
                if ( stripos( $value, '@import' ) !== false ) {
                        return true;
                }

                # We allow @font-face to embed fonts with data: urls, so we snip the string
                # 'url' out so that this case won't match when we check for urls below
                $pattern = '!(@font-face\s*{[^}]*src:)url(\("data:;base64,)!im';
                $value = preg_replace( $pattern, '$1$2', $value );

                # Check for remote and executable CSS. Unlike in Sanitizer::checkCss, the CSS
                # properties filter and accelerator don't seem to be useful for xss in SVG files.
                # Expression and -o-link don't seem to work either, but filtering them here in case.
                # Additionally, we catch remote urls like url("http:..., url('http:..., url(http:...,
                # but not local ones such as url("#..., url('#..., url(#....
                if ( preg_match( '!expression
                                | -o-link\s*:
                                | -o-link-source\s*:
                                | -o-replace\s*:!imx', $value ) ) {
                        return true;
                }

                if ( preg_match_all(
                                "!(\s*(url|image|image-set)\s*\(\s*[\"']?\s*[^#]+.*?\))!sim",
                                $value,
                                $matches
                        ) !== 0
                ) {
                        # TODO: redo this in one regex. Until then, url("#whatever") matches the first
                        foreach ( $matches[1] as $match ) {
                                if ( !preg_match( "!\s*(url|image|image-set)\s*\(\s*(#|'#|\"#)!im", $match ) ) {
                                        return true;
                                }
                        }
                }

                return (bool)preg_match( '/[\000-\010\013\016-\037\177]/', $value );
        }

        /**
         * Divide the element name passed by the XML parser to the callback into URI and prefix.
         * @param string $element
         * @return array Containing the namespace URI and prefix
         */
        private static function splitXmlNamespace( $element ) {
                // 'http://www.w3.org/2000/svg:script' -> [ 'http://www.w3.org/2000/svg', 'script' ]
                $parts = explode( ':', strtolower( $element ) );
                $name = array_pop( $parts );
                $ns = implode( ':', $parts );

                return [ $ns, $name ];
        }

        /**
         * @param string $element
         * @return string
         */
        private function stripXmlNamespace( $element ) {
                // 'http://www.w3.org/2000/svg:script' -> 'script'
                return self::splitXmlNamespace( $element )[1];
        }

        /**
         * Generic wrapper function for a virus scanner program.
         * This relies on the $wgAntivirus and $wgAntivirusSetup variables.
         * $wgAntivirusRequired may be used to deny upload if the scan fails.
         *
         * @param string $file Pathname to the temporary upload file
         * @return bool|null|string False if not virus is found, null if the scan fails or is disabled,
         *   or a string containing feedback from the virus scanner if a virus was found.
         *   If textual feedback is missing but a virus was found, this function returns true.
         */
        public static function detectVirus( $file ) {
                global $wgOut;
                $mainConfig = MediaWikiServices::getInstance()->getMainConfig();
                $antivirus = $mainConfig->get( MainConfigNames::Antivirus );
                $antivirusSetup = $mainConfig->get( MainConfigNames::AntivirusSetup );
                $antivirusRequired = $mainConfig->get( MainConfigNames::AntivirusRequired );
                if ( !$antivirus ) {
                        wfDebug( __METHOD__ . ": virus scanner disabled" );

                        return null;
                }

                if ( !$antivirusSetup[$antivirus] ) {
                        wfDebug( __METHOD__ . ": unknown virus scanner: {$antivirus}" );
                        $wgOut->wrapWikiMsg( "<div class=\"error\">\n$1\n</div>",
                                [ 'virus-badscanner', $antivirus ] );

                        return wfMessage( 'virus-unknownscanner' )->text() . " {$antivirus}";
                }

                # look up scanner configuration
                $command = $antivirusSetup[$antivirus]['command'];
                $exitCodeMap = $antivirusSetup[$antivirus]['codemap'];
                $msgPattern = $antivirusSetup[$antivirus]['messagepattern'] ?? null;

                if ( !str_contains( $command, "%f" ) ) {
                        # simple pattern: append file to scan
                        $command .= " " . Shell::escape( $file );
                } else {
                        # complex pattern: replace "%f" with file to scan
                        $command = str_replace( "%f", Shell::escape( $file ), $command );
                }

                wfDebug( __METHOD__ . ": running virus scan: $command " );

                # execute virus scanner
                $exitCode = false;

                # NOTE: there's a 50-line workaround to make stderr redirection work on windows, too.
                #  that does not seem to be worth the pain.
                #  Ask me (Duesentrieb) about it if it's ever needed.
                $output = wfShellExecWithStderr( $command, $exitCode );

                # map exit code to AV_xxx constants.
                $mappedCode = $exitCode;
                if ( $exitCodeMap ) {
                        if ( isset( $exitCodeMap[$exitCode] ) ) {
                                $mappedCode = $exitCodeMap[$exitCode];
                        } elseif ( isset( $exitCodeMap["*"] ) ) {
                                $mappedCode = $exitCodeMap["*"];
                        }
                }

                # NB: AV_NO_VIRUS is 0, but AV_SCAN_FAILED is false,
                # so we need the strict equalities === and thus can't use a switch here
                if ( $mappedCode === AV_SCAN_FAILED ) {
                        # scan failed (code was mapped to false by $exitCodeMap)
                        wfDebug( __METHOD__ . ": failed to scan $file (code $exitCode)." );

                        $output = $antivirusRequired
                                ? wfMessage( 'virus-scanfailed', [ $exitCode ] )->text()
                                : null;
                } elseif ( $mappedCode === AV_SCAN_ABORTED ) {
                        # scan failed because filetype is unknown (probably immune)
                        wfDebug( __METHOD__ . ": unsupported file type $file (code $exitCode)." );
                        $output = null;
                } elseif ( $mappedCode === AV_NO_VIRUS ) {
                        # no virus found
                        wfDebug( __METHOD__ . ": file passed virus scan." );
                        $output = false;
                } else {
                        $output = trim( $output );

                        if ( !$output ) {
                                $output = true; # if there's no output, return true
                        } elseif ( $msgPattern ) {
                                $groups = [];
                                if ( preg_match( $msgPattern, $output, $groups ) && $groups[1] ) {
                                        $output = $groups[1];
                                }
                        }

                        wfDebug( __METHOD__ . ": FOUND VIRUS! scanner feedback: $output" );
                }

                return $output;
        }

        /**
         * Check if there's a file overwrite conflict and, if so, if restrictions
         * forbid this user from performing the upload.
         *
         * @param Authority $performer
         *
         * @return bool|array
         */
        private function checkOverwrite( Authority $performer ) {
                // First check whether the local file can be overwritten
                $file = $this->getLocalFile();
                $file->load( IDBAccessObject::READ_LATEST );
                if ( $file->exists() ) {
                        if ( !self::userCanReUpload( $performer, $file ) ) {
                                return [ 'fileexists-forbidden', $file->getName() ];
                        }

                        return true;
                }

                $services = MediaWikiServices::getInstance();

                /* Check shared conflicts: if the local file does not exist, but
                 * RepoGroup::findFile finds a file, it exists in a shared repository.
                 */
                $file = $services->getRepoGroup()->findFile( $this->getTitle(), [ 'latest' => true ] );
                if ( $file && !$performer->isAllowed( 'reupload-shared' ) ) {
                        return [ 'fileexists-shared-forbidden', $file->getName() ];
                }

                return true;
        }

        /**
         * Check if a user is the last uploader
         *
         * @param Authority $performer
         * @param File $img
         * @return bool
         */
        public static function userCanReUpload( Authority $performer, File $img ) {
                if ( $performer->isAllowed( 'reupload' ) ) {
                        return true; // non-conditional
                }

                if ( !$performer->isAllowed( 'reupload-own' ) ) {
                        return false;
                }

                if ( !( $img instanceof LocalFile ) ) {
                        return false;
                }

                return $performer->getUser()->equals( $img->getUploader( File::RAW ) );
        }

        /**
         * Helper function that does various existence checks for a file.
         * The following checks are performed:
         * - If the file exists
         * - If an article with the same name as the file exists
         * - If a file exists with normalized extension
         * - If the file looks like a thumbnail and the original exists
         *
         * @param File $file The File object to check
         * @return array|false False if the file does not exist, else an array
         */
        public static function getExistsWarning( $file ) {
                if ( $file->exists() ) {
                        return [ 'warning' => 'exists', 'file' => $file ];
                }

                if ( $file->getTitle()->getArticleID() ) {
                        return [ 'warning' => 'page-exists', 'file' => $file ];
                }

                $n = strrpos( $file->getName(), '.' );
                if ( $n > 0 ) {
                        $partname = substr( $file->getName(), 0, $n );
                        $extension = substr( $file->getName(), $n + 1 );
                } else {
                        $partname = $file->getName();
                        $extension = '';
                }
                $normalizedExtension = File::normalizeExtension( $extension );
                $localRepo = MediaWikiServices::getInstance()->getRepoGroup()->getLocalRepo();

                if ( $normalizedExtension != $extension ) {
                        // We're not using the normalized form of the extension.
                        // Normal form is lowercase, using most common of alternate
                        // extensions (e.g. 'jpg' rather than 'JPEG').

                        // Check for another file using the normalized form...
                        $nt_lc = Title::makeTitle( NS_FILE, "{$partname}.{$normalizedExtension}" );
                        $file_lc = $localRepo->newFile( $nt_lc );

                        if ( $file_lc->exists() ) {
                                return [
                                        'warning' => 'exists-normalized',
                                        'file' => $file,
                                        'normalizedFile' => $file_lc
                                ];
                        }
                }

                // Check for files with the same name but a different extension
                $similarFiles = $localRepo->findFilesByPrefix( "{$partname}.", 1 );
                if ( count( $similarFiles ) ) {
                        return [
                                'warning' => 'exists-normalized',
                                'file' => $file,
                                'normalizedFile' => $similarFiles[0],
                        ];
                }

                if ( self::isThumbName( $file->getName() ) ) {
                        // Check for filenames like 50px- or 180px-, these are mostly thumbnails
                        $nt_thb = Title::newFromText(
                                substr( $partname, strpos( $partname, '-' ) + 1 ) . '.' . $extension,
                                NS_FILE
                        );
                        $file_thb = $localRepo->newFile( $nt_thb );
                        if ( $file_thb->exists() ) {
                                return [
                                        'warning' => 'thumb',
                                        'file' => $file,
                                        'thumbFile' => $file_thb
                                ];
                        }

                        // The file does not exist, but we just don't like the name
                        return [
                                'warning' => 'thumb-name',
                                'file' => $file,
                                'thumbFile' => $file_thb
                        ];
                }

                foreach ( self::getFilenamePrefixBlacklist() as $prefix ) {
                        if ( str_starts_with( $partname, $prefix ) ) {
                                return [
                                        'warning' => 'bad-prefix',
                                        'file' => $file,
                                        'prefix' => $prefix
                                ];
                        }
                }

                return false;
        }

        /**
         * Helper function that checks whether the filename looks like a thumbnail
         * @param string $filename
         * @return bool
         */
        public static function isThumbName( $filename ) {
                $n = strrpos( $filename, '.' );
                $partname = $n ? substr( $filename, 0, $n ) : $filename;

                return (
                        substr( $partname, 3, 3 ) === 'px-' ||
                        substr( $partname, 2, 3 ) === 'px-'
                ) && preg_match( "/[0-9]{2}/", substr( $partname, 0, 2 ) );
        }

        /**
         * Get a list of disallowed filename prefixes from [[MediaWiki:Filename-prefix-blacklist]]
         *
         * @return string[] List of prefixes
         */
        public static function getFilenamePrefixBlacklist() {
                $list = [];
                $message = wfMessage( 'filename-prefix-blacklist' )->inContentLanguage();
                if ( !$message->isDisabled() ) {
                        $lines = explode( "\n", $message->plain() );
                        foreach ( $lines as $line ) {
                                // Remove comment lines
                                $comment = substr( trim( $line ), 0, 1 );
                                if ( $comment === '#' || $comment == '' ) {
                                        continue;
                                }
                                // Remove additional comments after a prefix
                                $comment = strpos( $line, '#' );
                                if ( $comment > 0 ) {
                                        $line = substr( $line, 0, $comment - 1 );
                                }
                                $list[] = trim( $line );
                        }
                }

                return $list;
        }

        /**
         * Gets image info about the file just uploaded.
         *
         * @deprecated since 1.42, subclasses of ApiUpload can use
         * ApiUpload::getUploadImageInfo() instead.
         *
         * @param ?ApiResult $result unused since 1.42
         * @return array Image info
         */
        public function getImageInfo( $result = null ) {
                $apiUpload = ApiUpload::getDummyInstance();
                return $apiUpload->getUploadImageInfo( $this );
        }

        /**
         * @param array $error
         * @return Status
         */
        public function convertVerifyErrorToStatus( $error ) {
                $code = $error['status'];
                unset( $code['status'] );

                return Status::newFatal( $this->getVerificationErrorCode( $code ), $error );
        }

        /**
         * Get MediaWiki's maximum uploaded file size for a given type of upload, based on
         * $wgMaxUploadSize.
         *
         * @param null|string $forType
         * @return int
         */
        public static function getMaxUploadSize( $forType = null ) {
                $maxUploadSize = MediaWikiServices::getInstance()->getMainConfig()->get( MainConfigNames::MaxUploadSize );

                if ( is_array( $maxUploadSize ) ) {
                        return $maxUploadSize[$forType] ?? $maxUploadSize['*'];
                }
                return intval( $maxUploadSize );
        }

        /**
         * Get the PHP maximum uploaded file size, based on ini settings. If there is no limit or the
         * limit can't be guessed, return a very large number (PHP_INT_MAX) instead.
         *
         * @since 1.27
         * @return int
         */
        public static function getMaxPhpUploadSize() {
                $phpMaxFileSize = wfShorthandToInteger(
                        ini_get( 'upload_max_filesize' ),
                        PHP_INT_MAX
                );
                $phpMaxPostSize = wfShorthandToInteger(
                        ini_get( 'post_max_size' ),
                        PHP_INT_MAX
                ) ?: PHP_INT_MAX;
                return min( $phpMaxFileSize, $phpMaxPostSize );
        }

        /**
         * Get the current status of a chunked upload (used for polling).
         *
         * This should only be called during POST requests since we
         * fetch from dc-local MainStash, and from a GET request we can't
         * know that the value is available or up-to-date.
         *
         * @param UserIdentity $user
         * @param string $statusKey
         * @return mixed[]|false
         */
        public static function getSessionStatus( UserIdentity $user, $statusKey ) {
                $store = self::getUploadSessionStore();
                $key = self::getUploadSessionKey( $store, $user, $statusKey );

                return $store->get( $key );
        }

        /**
         * Set the current status of a chunked upload (used for polling).
         *
         * The value will be set in cache for 1 day.
         *
         * This should only be called during POST requests.
         *
         * @param UserIdentity $user
         * @param string $statusKey
         * @param array|false $value
         * @return void
         */
        public static function setSessionStatus( UserIdentity $user, $statusKey, $value ) {
                $store = self::getUploadSessionStore();
                $key = self::getUploadSessionKey( $store, $user, $statusKey );
                $logger = LoggerFactory::getInstance( 'upload' );

                if ( is_array( $value ) && ( $value['result'] ?? '' ) === 'Failure' ) {
                        $logger->info( 'Upload session {key} for {user} set to failure {status} at {stage}',
                                [
                                        'result' => $value['result'] ?? '',
                                        'stage' => $value['stage'] ?? 'unknown',
                                        'user' => $user->getName(),
                                        'status' => (string)( $value['status'] ?? '-' ),
                                        'filekey' => $value['filekey'] ?? '',
                                        'key' => $statusKey
                                ]
                        );
                } elseif ( is_array( $value ) ) {
                        $logger->debug( 'Upload session {key} for {user} changed {status} at {stage}',
                                [
                                        'result' => $value['result'] ?? '',
                                        'stage' => $value['stage'] ?? 'unknown',
                                        'user' => $user->getName(),
                                        'status' => (string)( $value['status'] ?? '-' ),
                                        'filekey' => $value['filekey'] ?? '',
                                        'key' => $statusKey
                                ]
                        );
                } else {
                        $logger->debug( "Upload session {key} deleted for {user}",
                                [
                                        'value' => $value,
                                        'key' => $statusKey,
                                        'user' => $user->getName()
                                ]
                        );
                }

                if ( $value === false ) {
                        $store->delete( $key );
                } else {
                        $store->set( $key, $value, $store::TTL_DAY );
                }
        }

        /**
         * @param BagOStuff $store
         * @param UserIdentity $user
         * @param string $statusKey
         * @return string
         */
        private static function getUploadSessionKey( BagOStuff $store, UserIdentity $user, $statusKey ) {
                return $store->makeKey(
                        'uploadstatus',
                        $user->isRegistered() ? $user->getId() : md5( $user->getName() ),
                        $statusKey
                );
        }

        /**
         * @return BagOStuff
         */
        private static function getUploadSessionStore() {
                return MediaWikiServices::getInstance()->getMainObjectStash();
        }
}