Add small HtmlCacheUpdater service class to normalize purging code

[lhc/web/wiklou.git] / includes / filerepo / file / LocalFile.php

<?php
/**
 * Local file in the wiki's own database.
 *
 * 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 FileAbstraction
 */

use Wikimedia\AtEase\AtEase;
use MediaWiki\Logger\LoggerFactory;
use Wikimedia\Rdbms\Database;
use Wikimedia\Rdbms\IDatabase;
use Wikimedia\Rdbms\IResultWrapper;
use MediaWiki\MediaWikiServices;

/**
 * Class to represent a local file in the wiki's own database
 *
 * Provides methods to retrieve paths (physical, logical, URL),
 * to generate image thumbnails or for uploading.
 *
 * Note that only the repo object knows what its file class is called. You should
 * never name a file class explictly outside of the repo class. Instead use the
 * repo's factory functions to generate file objects, for example:
 *
 * RepoGroup::singleton()->getLocalRepo()->newFile( $title );
 *
 * Consider the services container below;
 *
 * $services = MediaWikiServices::getInstance();
 *
 * The convenience services $services->getRepoGroup()->getLocalRepo()->newFile()
 * and $services->getRepoGroup()->findFile() should be sufficient in most cases.
 *
 * @TODO: DI - Instead of using MediaWikiServices::getInstance(), a service should
 * ideally accept a RepoGroup in its constructor and then, use $this->repoGroup->findFile()
 * and $this->repoGroup->getLocalRepo()->newFile().
 *
 * @ingroup FileAbstraction
 */
class LocalFile extends File {
        const VERSION = 11; // cache version

        const CACHE_FIELD_MAX_LEN = 1000;

        /** @var bool Does the file exist on disk? (loadFromXxx) */
        protected $fileExists;

        /** @var int Image width */
        protected $width;

        /** @var int Image height */
        protected $height;

        /** @var int Returned by getimagesize (loadFromXxx) */
        protected $bits;

        /** @var string MEDIATYPE_xxx (bitmap, drawing, audio...) */
        protected $media_type;

        /** @var string MIME type, determined by MimeAnalyzer::guessMimeType */
        protected $mime;

        /** @var int Size in bytes (loadFromXxx) */
        protected $size;

        /** @var string Handler-specific metadata */
        protected $metadata;

        /** @var string SHA-1 base 36 content hash */
        protected $sha1;

        /** @var bool Whether or not core data has been loaded from the database (loadFromXxx) */
        protected $dataLoaded;

        /** @var bool Whether or not lazy-loaded data has been loaded from the database */
        protected $extraDataLoaded;

        /** @var int Bitfield akin to rev_deleted */
        protected $deleted;

        /** @var string */
        protected $repoClass = LocalRepo::class;

        /** @var int Number of line to return by nextHistoryLine() (constructor) */
        private $historyLine;

        /** @var IResultWrapper|null Result of the query for the file's history (nextHistoryLine) */
        private $historyRes;

        /** @var string Major MIME type */
        private $major_mime;

        /** @var string Minor MIME type */
        private $minor_mime;

        /** @var string Upload timestamp */
        private $timestamp;

        /** @var User Uploader */
        private $user;

        /** @var string Description of current revision of the file */
        private $description;

        /** @var string TS_MW timestamp of the last change of the file description */
        private $descriptionTouched;

        /** @var bool Whether the row was upgraded on load */
        private $upgraded;

        /** @var bool Whether the row was scheduled to upgrade on load */
        private $upgrading;

        /** @var bool True if the image row is locked */
        private $locked;

        /** @var bool True if the image row is locked with a lock initiated transaction */
        private $lockedOwnTrx;

        /** @var bool True if file is not present in file system. Not to be cached in memcached */
        private $missing;

        // @note: higher than IDBAccessObject constants
        const LOAD_ALL = 16; // integer; load all the lazy fields too (like metadata)

        const ATOMIC_SECTION_LOCK = 'LocalFile::lockingTransaction';

        /**
         * Create a LocalFile from a title
         * Do not call this except from inside a repo class.
         *
         * Note: $unused param is only here to avoid an E_STRICT
         *
         * @param Title $title
         * @param FileRepo $repo
         * @param null $unused
         *
         * @return static
         */
        static function newFromTitle( $title, $repo, $unused = null ) {
                return new static( $title, $repo );
        }

        /**
         * Create a LocalFile from a title
         * Do not call this except from inside a repo class.
         *
         * @param stdClass $row
         * @param FileRepo $repo
         *
         * @return static
         */
        static function newFromRow( $row, $repo ) {
                $title = Title::makeTitle( NS_FILE, $row->img_name );
                $file = new static( $title, $repo );
                $file->loadFromRow( $row );

                return $file;
        }

        /**
         * Create a LocalFile from a SHA-1 key
         * Do not call this except from inside a repo class.
         *
         * @param string $sha1 Base-36 SHA-1
         * @param LocalRepo $repo
         * @param string|bool $timestamp MW_timestamp (optional)
         * @return bool|LocalFile
         */
        static function newFromKey( $sha1, $repo, $timestamp = false ) {
                $dbr = $repo->getReplicaDB();

                $conds = [ 'img_sha1' => $sha1 ];
                if ( $timestamp ) {
                        $conds['img_timestamp'] = $dbr->timestamp( $timestamp );
                }

                $fileQuery = static::getQueryInfo();
                $row = $dbr->selectRow(
                        $fileQuery['tables'], $fileQuery['fields'], $conds, __METHOD__, [], $fileQuery['joins']
                );
                if ( $row ) {
                        return static::newFromRow( $row, $repo );
                } else {
                        return false;
                }
        }

        /**
         * Fields in the image table
         * @deprecated since 1.31, use self::getQueryInfo() instead.
         * @return string[]
         */
        static function selectFields() {
                global $wgActorTableSchemaMigrationStage;

                wfDeprecated( __METHOD__, '1.31' );
                if ( $wgActorTableSchemaMigrationStage & SCHEMA_COMPAT_READ_NEW ) {
                        // If code is using this instead of self::getQueryInfo(), there's a
                        // decent chance it's going to try to directly access
                        // $row->img_user or $row->img_user_text and we can't give it
                        // useful values here once those aren't being used anymore.
                        throw new BadMethodCallException(
                                'Cannot use ' . __METHOD__
                                        . ' when $wgActorTableSchemaMigrationStage has SCHEMA_COMPAT_READ_NEW'
                        );
                }

                return [
                        'img_name',
                        'img_size',
                        'img_width',
                        'img_height',
                        'img_metadata',
                        'img_bits',
                        'img_media_type',
                        'img_major_mime',
                        'img_minor_mime',
                        'img_user',
                        'img_user_text',
                        'img_actor' => 'NULL',
                        'img_timestamp',
                        'img_sha1',
                ] + MediaWikiServices::getInstance()->getCommentStore()->getFields( 'img_description' );
        }

        /**
         * Return the tables, fields, and join conditions to be selected to create
         * a new localfile object.
         * @since 1.31
         * @param string[] $options
         *   - omit-lazy: Omit fields that are lazily cached.
         * @return array[] With three keys:
         *   - tables: (string[]) to include in the `$table` to `IDatabase->select()`
         *   - fields: (string[]) to include in the `$vars` to `IDatabase->select()`
         *   - joins: (array) to include in the `$join_conds` to `IDatabase->select()`
         */
        public static function getQueryInfo( array $options = [] ) {
                $commentQuery = MediaWikiServices::getInstance()->getCommentStore()->getJoin( 'img_description' );
                $actorQuery = ActorMigration::newMigration()->getJoin( 'img_user' );
                $ret = [
                        'tables' => [ 'image' ] + $commentQuery['tables'] + $actorQuery['tables'],
                        'fields' => [
                                'img_name',
                                'img_size',
                                'img_width',
                                'img_height',
                                'img_metadata',
                                'img_bits',
                                'img_media_type',
                                'img_major_mime',
                                'img_minor_mime',
                                'img_timestamp',
                                'img_sha1',
                        ] + $commentQuery['fields'] + $actorQuery['fields'],
                        'joins' => $commentQuery['joins'] + $actorQuery['joins'],
                ];

                if ( in_array( 'omit-nonlazy', $options, true ) ) {
                        // Internal use only for getting only the lazy fields
                        $ret['fields'] = [];
                }
                if ( !in_array( 'omit-lazy', $options, true ) ) {
                        // Note: Keep this in sync with self::getLazyCacheFields()
                        $ret['fields'][] = 'img_metadata';
                }

                return $ret;
        }

        /**
         * Do not call this except from inside a repo class.
         * @param Title $title
         * @param FileRepo $repo
         */
        function __construct( $title, $repo ) {
                parent::__construct( $title, $repo );

                $this->metadata = '';
                $this->historyLine = 0;
                $this->historyRes = null;
                $this->dataLoaded = false;
                $this->extraDataLoaded = false;

                $this->assertRepoDefined();
                $this->assertTitleDefined();
        }

        /**
         * Get the memcached key for the main data for this file, or false if
         * there is no access to the shared cache.
         * @return string|bool
         */
        function getCacheKey() {
                return $this->repo->getSharedCacheKey( 'file', sha1( $this->getName() ) );
        }

        /**
         * @param WANObjectCache $cache
         * @return string[]
         * @since 1.28
         */
        public function getMutableCacheKeys( WANObjectCache $cache ) {
                return [ $this->getCacheKey() ];
        }

        /**
         * Try to load file metadata from memcached, falling back to the database
         */
        private function loadFromCache() {
                $this->dataLoaded = false;
                $this->extraDataLoaded = false;

                $key = $this->getCacheKey();
                if ( !$key ) {
                        $this->loadFromDB( self::READ_NORMAL );

                        return;
                }

                $cache = MediaWikiServices::getInstance()->getMainWANObjectCache();
                $cachedValues = $cache->getWithSetCallback(
                        $key,
                        $cache::TTL_WEEK,
                        function ( $oldValue, &$ttl, array &$setOpts ) use ( $cache ) {
                                $setOpts += Database::getCacheSetOptions( $this->repo->getReplicaDB() );

                                $this->loadFromDB( self::READ_NORMAL );

                                $fields = $this->getCacheFields( '' );
                                $cacheVal['fileExists'] = $this->fileExists;
                                if ( $this->fileExists ) {
                                        foreach ( $fields as $field ) {
                                                $cacheVal[$field] = $this->$field;
                                        }
                                }
                                $cacheVal['user'] = $this->user ? $this->user->getId() : 0;
                                $cacheVal['user_text'] = $this->user ? $this->user->getName() : '';
                                $cacheVal['actor'] = $this->user ? $this->user->getActorId() : null;

                                // Strip off excessive entries from the subset of fields that can become large.
                                // If the cache value gets to large it will not fit in memcached and nothing will
                                // get cached at all, causing master queries for any file access.
                                foreach ( $this->getLazyCacheFields( '' ) as $field ) {
                                        if ( isset( $cacheVal[$field] )
                                                && strlen( $cacheVal[$field] ) > 100 * 1024
                                        ) {
                                                unset( $cacheVal[$field] ); // don't let the value get too big
                                        }
                                }

                                if ( $this->fileExists ) {
                                        $ttl = $cache->adaptiveTTL( wfTimestamp( TS_UNIX, $this->timestamp ), $ttl );
                                } else {
                                        $ttl = $cache::TTL_DAY;
                                }

                                return $cacheVal;
                        },
                        [ 'version' => self::VERSION ]
                );

                $this->fileExists = $cachedValues['fileExists'];
                if ( $this->fileExists ) {
                        $this->setProps( $cachedValues );
                }

                $this->dataLoaded = true;
                $this->extraDataLoaded = true;
                foreach ( $this->getLazyCacheFields( '' ) as $field ) {
                        $this->extraDataLoaded = $this->extraDataLoaded && isset( $cachedValues[$field] );
                }
        }

        /**
         * Purge the file object/metadata cache
         */
        public function invalidateCache() {
                $key = $this->getCacheKey();
                if ( !$key ) {
                        return;
                }

                $this->repo->getMasterDB()->onTransactionPreCommitOrIdle(
                        function () use ( $key ) {
                                MediaWikiServices::getInstance()->getMainWANObjectCache()->delete( $key );
                        },
                        __METHOD__
                );
        }

        /**
         * Load metadata from the file itself
         */
        function loadFromFile() {
                $props = $this->repo->getFileProps( $this->getVirtualUrl() );
                $this->setProps( $props );
        }

        /**
         * Returns the list of object properties that are included as-is in the cache.
         * @param string $prefix Must be the empty string
         * @return string[]
         * @since 1.31 No longer accepts a non-empty $prefix
         */
        protected function getCacheFields( $prefix = 'img_' ) {
                if ( $prefix !== '' ) {
                        throw new InvalidArgumentException(
                                __METHOD__ . ' with a non-empty prefix is no longer supported.'
                        );
                }

                // See self::getQueryInfo() for the fetching of the data from the DB,
                // self::loadFromRow() for the loading of the object from the DB row,
                // and self::loadFromCache() for the caching, and self::setProps() for
                // populating the object from an array of data.
                return [ 'size', 'width', 'height', 'bits', 'media_type',
                        'major_mime', 'minor_mime', 'metadata', 'timestamp', 'sha1', 'description' ];
        }

        /**
         * Returns the list of object properties that are included as-is in the
         * cache, only when they're not too big, and are lazily loaded by self::loadExtraFromDB().
         * @param string $prefix Must be the empty string
         * @return string[]
         * @since 1.31 No longer accepts a non-empty $prefix
         */
        protected function getLazyCacheFields( $prefix = 'img_' ) {
                if ( $prefix !== '' ) {
                        throw new InvalidArgumentException(
                                __METHOD__ . ' with a non-empty prefix is no longer supported.'
                        );
                }

                // Keep this in sync with the omit-lazy option in self::getQueryInfo().
                return [ 'metadata' ];
        }

        /**
         * Load file metadata from the DB
         * @param int $flags
         */
        function loadFromDB( $flags = 0 ) {
                $fname = static::class . '::' . __FUNCTION__;

                # Unconditionally set loaded=true, we don't want the accessors constantly rechecking
                $this->dataLoaded = true;
                $this->extraDataLoaded = true;

                $dbr = ( $flags & self::READ_LATEST )
                        ? $this->repo->getMasterDB()
                        : $this->repo->getReplicaDB();

                $fileQuery = static::getQueryInfo();
                $row = $dbr->selectRow(
                        $fileQuery['tables'],
                        $fileQuery['fields'],
                        [ 'img_name' => $this->getName() ],
                        $fname,
                        [],
                        $fileQuery['joins']
                );

                if ( $row ) {
                        $this->loadFromRow( $row );
                } else {
                        $this->fileExists = false;
                }
        }

        /**
         * Load lazy file metadata from the DB.
         * This covers fields that are sometimes not cached.
         */
        protected function loadExtraFromDB() {
                $fname = static::class . '::' . __FUNCTION__;

                # Unconditionally set loaded=true, we don't want the accessors constantly rechecking
                $this->extraDataLoaded = true;

                $fieldMap = $this->loadExtraFieldsWithTimestamp( $this->repo->getReplicaDB(), $fname );
                if ( !$fieldMap ) {
                        $fieldMap = $this->loadExtraFieldsWithTimestamp( $this->repo->getMasterDB(), $fname );
                }

                if ( $fieldMap ) {
                        foreach ( $fieldMap as $name => $value ) {
                                $this->$name = $value;
                        }
                } else {
                        throw new MWException( "Could not find data for image '{$this->getName()}'." );
                }
        }

        /**
         * @param IDatabase $dbr
         * @param string $fname
         * @return string[]|bool
         */
        private function loadExtraFieldsWithTimestamp( $dbr, $fname ) {
                $fieldMap = false;

                $fileQuery = self::getQueryInfo( [ 'omit-nonlazy' ] );
                $row = $dbr->selectRow(
                        $fileQuery['tables'],
                        $fileQuery['fields'],
                        [
                                'img_name' => $this->getName(),
                                'img_timestamp' => $dbr->timestamp( $this->getTimestamp() ),
                        ],
                        $fname,
                        [],
                        $fileQuery['joins']
                );
                if ( $row ) {
                        $fieldMap = $this->unprefixRow( $row, 'img_' );
                } else {
                        # File may have been uploaded over in the meantime; check the old versions
                        $fileQuery = OldLocalFile::getQueryInfo( [ 'omit-nonlazy' ] );
                        $row = $dbr->selectRow(
                                $fileQuery['tables'],
                                $fileQuery['fields'],
                                [
                                        'oi_name' => $this->getName(),
                                        'oi_timestamp' => $dbr->timestamp( $this->getTimestamp() ),
                                ],
                                $fname,
                                [],
                                $fileQuery['joins']
                        );
                        if ( $row ) {
                                $fieldMap = $this->unprefixRow( $row, 'oi_' );
                        }
                }

                if ( isset( $fieldMap['metadata'] ) ) {
                        $fieldMap['metadata'] = $this->repo->getReplicaDB()->decodeBlob( $fieldMap['metadata'] );
                }

                return $fieldMap;
        }

        /**
         * @param array|object $row
         * @param string $prefix
         * @throws MWException
         * @return array
         */
        protected function unprefixRow( $row, $prefix = 'img_' ) {
                $array = (array)$row;
                $prefixLength = strlen( $prefix );

                // Sanity check prefix once
                if ( substr( key( $array ), 0, $prefixLength ) !== $prefix ) {
                        throw new MWException( __METHOD__ . ': incorrect $prefix parameter' );
                }

                $decoded = [];
                foreach ( $array as $name => $value ) {
                        $decoded[substr( $name, $prefixLength )] = $value;
                }

                return $decoded;
        }

        /**
         * Decode a row from the database (either object or array) to an array
         * with timestamps and MIME types decoded, and the field prefix removed.
         * @param object $row
         * @param string $prefix
         * @throws MWException
         * @return array
         */
        function decodeRow( $row, $prefix = 'img_' ) {
                $decoded = $this->unprefixRow( $row, $prefix );

                $decoded['description'] = MediaWikiServices::getInstance()->getCommentStore()
                        ->getComment( 'description', (object)$decoded )->text;

                $decoded['user'] = User::newFromAnyId(
                        $decoded['user'] ?? null,
                        $decoded['user_text'] ?? null,
                        $decoded['actor'] ?? null
                );
                unset( $decoded['user_text'], $decoded['actor'] );

                $decoded['timestamp'] = wfTimestamp( TS_MW, $decoded['timestamp'] );

                $decoded['metadata'] = $this->repo->getReplicaDB()->decodeBlob( $decoded['metadata'] );

                if ( empty( $decoded['major_mime'] ) ) {
                        $decoded['mime'] = 'unknown/unknown';
                } else {
                        if ( !$decoded['minor_mime'] ) {
                                $decoded['minor_mime'] = 'unknown';
                        }
                        $decoded['mime'] = $decoded['major_mime'] . '/' . $decoded['minor_mime'];
                }

                // Trim zero padding from char/binary field
                $decoded['sha1'] = rtrim( $decoded['sha1'], "\0" );

                // Normalize some fields to integer type, per their database definition.
                // Use unary + so that overflows will be upgraded to double instead of
                // being trucated as with intval(). This is important to allow >2GB
                // files on 32-bit systems.
                foreach ( [ 'size', 'width', 'height', 'bits' ] as $field ) {
                        $decoded[$field] = +$decoded[$field];
                }

                return $decoded;
        }

        /**
         * Load file metadata from a DB result row
         *
         * @param object $row
         * @param string $prefix
         */
        function loadFromRow( $row, $prefix = 'img_' ) {
                $this->dataLoaded = true;
                $this->extraDataLoaded = true;

                $array = $this->decodeRow( $row, $prefix );

                foreach ( $array as $name => $value ) {
                        $this->$name = $value;
                }

                $this->fileExists = true;
        }

        /**
         * Load file metadata from cache or DB, unless already loaded
         * @param int $flags
         */
        function load( $flags = 0 ) {
                if ( !$this->dataLoaded ) {
                        if ( $flags & self::READ_LATEST ) {
                                $this->loadFromDB( $flags );
                        } else {
                                $this->loadFromCache();
                        }
                }

                if ( ( $flags & self::LOAD_ALL ) && !$this->extraDataLoaded ) {
                        // @note: loads on name/timestamp to reduce race condition problems
                        $this->loadExtraFromDB();
                }
        }

        /**
         * Upgrade a row if it needs it
         */
        protected function maybeUpgradeRow() {
                global $wgUpdateCompatibleMetadata;

                if ( wfReadOnly() || $this->upgrading ) {
                        return;
                }

                $upgrade = false;
                if ( is_null( $this->media_type ) || $this->mime == 'image/svg' ) {
                        $upgrade = true;
                } else {
                        $handler = $this->getHandler();
                        if ( $handler ) {
                                $validity = $handler->isMetadataValid( $this, $this->getMetadata() );
                                if ( $validity === MediaHandler::METADATA_BAD ) {
                                        $upgrade = true;
                                } elseif ( $validity === MediaHandler::METADATA_COMPATIBLE ) {
                                        $upgrade = $wgUpdateCompatibleMetadata;
                                }
                        }
                }

                if ( $upgrade ) {
                        $this->upgrading = true;
                        // Defer updates unless in auto-commit CLI mode
                        DeferredUpdates::addCallableUpdate( function () {
                                $this->upgrading = false; // avoid duplicate updates
                                try {
                                        $this->upgradeRow();
                                } catch ( LocalFileLockError $e ) {
                                        // let the other process handle it (or do it next time)
                                }
                        } );
                }
        }

        /**
         * @return bool Whether upgradeRow() ran for this object
         */
        function getUpgraded() {
                return $this->upgraded;
        }

        /**
         * Fix assorted version-related problems with the image row by reloading it from the file
         */
        function upgradeRow() {
                $this->lock();

                $this->loadFromFile();

                # Don't destroy file info of missing files
                if ( !$this->fileExists ) {
                        $this->unlock();
                        wfDebug( __METHOD__ . ": file does not exist, aborting\n" );

                        return;
                }

                $dbw = $this->repo->getMasterDB();
                list( $major, $minor ) = self::splitMime( $this->mime );

                if ( wfReadOnly() ) {
                        $this->unlock();

                        return;
                }
                wfDebug( __METHOD__ . ': upgrading ' . $this->getName() . " to the current schema\n" );

                $dbw->update( 'image',
                        [
                                'img_size' => $this->size, // sanity
                                'img_width' => $this->width,
                                'img_height' => $this->height,
                                'img_bits' => $this->bits,
                                'img_media_type' => $this->media_type,
                                'img_major_mime' => $major,
                                'img_minor_mime' => $minor,
                                'img_metadata' => $dbw->encodeBlob( $this->metadata ),
                                'img_sha1' => $this->sha1,
                        ],
                        [ 'img_name' => $this->getName() ],
                        __METHOD__
                );

                $this->invalidateCache();

                $this->unlock();
                $this->upgraded = true; // avoid rework/retries
        }

        /**
         * Set properties in this object to be equal to those given in the
         * associative array $info. Only cacheable fields can be set.
         * All fields *must* be set in $info except for getLazyCacheFields().
         *
         * If 'mime' is given, it will be split into major_mime/minor_mime.
         * If major_mime/minor_mime are given, $this->mime will also be set.
         *
         * @param array $info
         */
        function setProps( $info ) {
                $this->dataLoaded = true;
                $fields = $this->getCacheFields( '' );
                $fields[] = 'fileExists';

                foreach ( $fields as $field ) {
                        if ( isset( $info[$field] ) ) {
                                $this->$field = $info[$field];
                        }
                }

                if ( isset( $info['user'] ) || isset( $info['user_text'] ) || isset( $info['actor'] ) ) {
                        $this->user = User::newFromAnyId(
                                $info['user'] ?? null,
                                $info['user_text'] ?? null,
                                $info['actor'] ?? null
                        );
                }

                // Fix up mime fields
                if ( isset( $info['major_mime'] ) ) {
                        $this->mime = "{$info['major_mime']}/{$info['minor_mime']}";
                } elseif ( isset( $info['mime'] ) ) {
                        $this->mime = $info['mime'];
                        list( $this->major_mime, $this->minor_mime ) = self::splitMime( $this->mime );
                }
        }

        /** splitMime inherited */
        /** getName inherited */
        /** getTitle inherited */
        /** getURL inherited */
        /** getViewURL inherited */
        /** getPath inherited */
        /** isVisible inherited */

        /**
         * Checks if this file exists in its parent repo, as referenced by its
         * virtual URL.
         *
         * @return bool
         */
        function isMissing() {
                if ( $this->missing === null ) {
                        $fileExists = $this->repo->fileExists( $this->getVirtualUrl() );
                        $this->missing = !$fileExists;
                }

                return $this->missing;
        }

        /**
         * Return the width of the image
         *
         * @param int $page
         * @return int
         */
        public function getWidth( $page = 1 ) {
                $page = (int)$page;
                if ( $page < 1 ) {
                        $page = 1;
                }

                $this->load();

                if ( $this->isMultipage() ) {
                        $handler = $this->getHandler();
                        if ( !$handler ) {
                                return 0;
                        }
                        $dim = $handler->getPageDimensions( $this, $page );
                        if ( $dim ) {
                                return $dim['width'];
                        } else {
                                // For non-paged media, the false goes through an
                                // intval, turning failure into 0, so do same here.
                                return 0;
                        }
                } else {
                        return $this->width;
                }
        }

        /**
         * Return the height of the image
         *
         * @param int $page
         * @return int
         */
        public function getHeight( $page = 1 ) {
                $page = (int)$page;
                if ( $page < 1 ) {
                        $page = 1;
                }

                $this->load();

                if ( $this->isMultipage() ) {
                        $handler = $this->getHandler();
                        if ( !$handler ) {
                                return 0;
                        }
                        $dim = $handler->getPageDimensions( $this, $page );
                        if ( $dim ) {
                                return $dim['height'];
                        } else {
                                // For non-paged media, the false goes through an
                                // intval, turning failure into 0, so do same here.
                                return 0;
                        }
                } else {
                        return $this->height;
                }
        }

        /**
         * Returns user who uploaded the file
         *
         * @param string $type 'text', 'id', or 'object'
         * @return int|string|User
         * @since 1.31 Added 'object'
         */
        function getUser( $type = 'text' ) {
                $this->load();

                if ( $type === 'object' ) {
                        return $this->user;
                } elseif ( $type === 'text' ) {
                        return $this->user->getName();
                } elseif ( $type === 'id' ) {
                        return $this->user->getId();
                }

                throw new MWException( "Unknown type '$type'." );
        }

        /**
         * Get short description URL for a file based on the page ID.
         *
         * @return string|null
         * @throws MWException
         * @since 1.27
         */
        public function getDescriptionShortUrl() {
                $pageId = $this->title->getArticleID();

                if ( $pageId !== null ) {
                        $url = $this->repo->makeUrl( [ 'curid' => $pageId ] );
                        if ( $url !== false ) {
                                return $url;
                        }
                }
                return null;
        }

        /**
         * Get handler-specific metadata
         * @return string
         */
        function getMetadata() {
                $this->load( self::LOAD_ALL ); // large metadata is loaded in another step
                return $this->metadata;
        }

        /**
         * @return int
         */
        function getBitDepth() {
                $this->load();

                return (int)$this->bits;
        }

        /**
         * Returns the size of the image file, in bytes
         * @return int
         */
        public function getSize() {
                $this->load();

                return $this->size;
        }

        /**
         * Returns the MIME type of the file.
         * @return string
         */
        function getMimeType() {
                $this->load();

                return $this->mime;
        }

        /**
         * Returns the type of the media in the file.
         * Use the value returned by this function with the MEDIATYPE_xxx constants.
         * @return string
         */
        function getMediaType() {
                $this->load();

                return $this->media_type;
        }

        /** canRender inherited */
        /** mustRender inherited */
        /** allowInlineDisplay inherited */
        /** isSafeFile inherited */
        /** isTrustedFile inherited */

        /**
         * Returns true if the file exists on disk.
         * @return bool Whether file exist on disk.
         */
        public function exists() {
                $this->load();

                return $this->fileExists;
        }

        /** getTransformScript inherited */
        /** getUnscaledThumb inherited */
        /** thumbName inherited */
        /** createThumb inherited */
        /** transform inherited */

        /** getHandler inherited */
        /** iconThumb inherited */
        /** getLastError inherited */

        /**
         * Get all thumbnail names previously generated for this file
         * @param string|bool $archiveName Name of an archive file, default false
         * @return array First element is the base dir, then files in that base dir.
         */
        function getThumbnails( $archiveName = false ) {
                if ( $archiveName ) {
                        $dir = $this->getArchiveThumbPath( $archiveName );
                } else {
                        $dir = $this->getThumbPath();
                }

                $backend = $this->repo->getBackend();
                $files = [ $dir ];
                try {
                        $iterator = $backend->getFileList( [ 'dir' => $dir ] );
                        foreach ( $iterator as $file ) {
                                $files[] = $file;
                        }
                } catch ( FileBackendError $e ) {
                } // suppress (T56674)

                return $files;
        }

        /**
         * Refresh metadata in memcached, but don't touch thumbnails or CDN
         */
        function purgeMetadataCache() {
                $this->invalidateCache();
        }

        /**
         * Delete all previously generated thumbnails, refresh metadata in memcached and purge the CDN.
         *
         * @param array $options An array potentially with the key forThumbRefresh.
         *
         * @note This used to purge old thumbnails by default as well, but doesn't anymore.
         */
        function purgeCache( $options = [] ) {
                // Refresh metadata cache
                $this->maybeUpgradeRow();
                $this->purgeMetadataCache();

                // Delete thumbnails
                $this->purgeThumbnails( $options );

                // Purge CDN cache for this file
                MediaWikiServices::getInstance()->getHtmlCacheUpdater()->purge( $this->getUrl() );
        }

        /**
         * Delete cached transformed files for an archived version only.
         * @param string $archiveName Name of the archived file
         */
        function purgeOldThumbnails( $archiveName ) {
                // Get a list of old thumbnails and URLs
                $files = $this->getThumbnails( $archiveName );

                // Purge any custom thumbnail caches
                Hooks::run( 'LocalFilePurgeThumbnails', [ $this, $archiveName ] );

                // Delete thumbnails
                $dir = array_shift( $files );
                $this->purgeThumbList( $dir, $files );

                // Purge the CDN
                $urls = [];
                foreach ( $files as $file ) {
                        $urls[] = $this->getArchiveThumbUrl( $archiveName, $file );
                }
                MediaWikiServices::getInstance()->getHtmlCacheUpdater()->purge( $urls );
        }

        /**
         * Delete cached transformed files for the current version only.
         * @param array $options
         */
        public function purgeThumbnails( $options = [] ) {
                $files = $this->getThumbnails();
                // Always purge all files from CDN regardless of handler filters
                $urls = [];
                foreach ( $files as $file ) {
                        $urls[] = $this->getThumbUrl( $file );
                }
                array_shift( $urls ); // don't purge directory

                // Give media handler a chance to filter the file purge list
                if ( !empty( $options['forThumbRefresh'] ) ) {
                        $handler = $this->getHandler();
                        if ( $handler ) {
                                $handler->filterThumbnailPurgeList( $files, $options );
                        }
                }

                // Purge any custom thumbnail caches
                Hooks::run( 'LocalFilePurgeThumbnails', [ $this, false ] );

                // Delete thumbnails
                $dir = array_shift( $files );
                $this->purgeThumbList( $dir, $files );

                // Purge the CDN
                MediaWikiServices::getInstance()->getHtmlCacheUpdater()->purge( $urls );
        }

        /**
         * Prerenders a configurable set of thumbnails
         *
         * @since 1.28
         */
        public function prerenderThumbnails() {
                global $wgUploadThumbnailRenderMap;

                $jobs = [];

                $sizes = $wgUploadThumbnailRenderMap;
                rsort( $sizes );

                foreach ( $sizes as $size ) {
                        if ( $this->isVectorized() || $this->getWidth() > $size ) {
                                $jobs[] = new ThumbnailRenderJob(
                                        $this->getTitle(),
                                        [ 'transformParams' => [ 'width' => $size ] ]
                                );
                        }
                }

                if ( $jobs ) {
                        JobQueueGroup::singleton()->lazyPush( $jobs );
                }
        }

        /**
         * Delete a list of thumbnails visible at urls
         * @param string $dir Base dir of the files.
         * @param array $files Array of strings: relative filenames (to $dir)
         */
        protected function purgeThumbList( $dir, $files ) {
                $fileListDebug = strtr(
                        var_export( $files, true ),
                        [ "\n" => '' ]
                );
                wfDebug( __METHOD__ . ": $fileListDebug\n" );

                $purgeList = [];
                foreach ( $files as $file ) {
                        if ( $this->repo->supportsSha1URLs() ) {
                                $reference = $this->getSha1();
                        } else {
                                $reference = $this->getName();
                        }

                        # Check that the reference (filename or sha1) is part of the thumb name
                        # This is a basic sanity check to avoid erasing unrelated directories
                        if ( strpos( $file, $reference ) !== false
                                || strpos( $file, "-thumbnail" ) !== false // "short" thumb name
                        ) {
                                $purgeList[] = "{$dir}/{$file}";
                        }
                }

                # Delete the thumbnails
                $this->repo->quickPurgeBatch( $purgeList );
                # Clear out the thumbnail directory if empty
                $this->repo->quickCleanDir( $dir );
        }

        /** purgeDescription inherited */
        /** purgeEverything inherited */

        /**
         * @param int|null $limit Optional: Limit to number of results
         * @param string|int|null $start Optional: Timestamp, start from
         * @param string|int|null $end Optional: Timestamp, end at
         * @param bool $inc
         * @return OldLocalFile[]
         */
        function getHistory( $limit = null, $start = null, $end = null, $inc = true ) {
                $dbr = $this->repo->getReplicaDB();
                $oldFileQuery = OldLocalFile::getQueryInfo();

                $tables = $oldFileQuery['tables'];
                $fields = $oldFileQuery['fields'];
                $join_conds = $oldFileQuery['joins'];
                $conds = $opts = [];
                $eq = $inc ? '=' : '';
                $conds[] = "oi_name = " . $dbr->addQuotes( $this->title->getDBkey() );

                if ( $start ) {
                        $conds[] = "oi_timestamp <$eq " . $dbr->addQuotes( $dbr->timestamp( $start ) );
                }

                if ( $end ) {
                        $conds[] = "oi_timestamp >$eq " . $dbr->addQuotes( $dbr->timestamp( $end ) );
                }

                if ( $limit ) {
                        $opts['LIMIT'] = $limit;
                }

                // Search backwards for time > x queries
                $order = ( !$start && $end !== null ) ? 'ASC' : 'DESC';
                $opts['ORDER BY'] = "oi_timestamp $order";
                $opts['USE INDEX'] = [ 'oldimage' => 'oi_name_timestamp' ];

                // Avoid PHP 7.1 warning from passing $this by reference
                $localFile = $this;
                Hooks::run( 'LocalFile::getHistory', [ &$localFile, &$tables, &$fields,
                        &$conds, &$opts, &$join_conds ] );

                $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $opts, $join_conds );
                $r = [];

                foreach ( $res as $row ) {
                        $r[] = $this->repo->newFileFromRow( $row );
                }

                if ( $order == 'ASC' ) {
                        $r = array_reverse( $r ); // make sure it ends up descending
                }

                return $r;
        }

        /**
         * Returns the history of this file, line by line.
         * starts with current version, then old versions.
         * uses $this->historyLine to check which line to return:
         *  0      return line for current version
         *  1      query for old versions, return first one
         *  2, ... return next old version from above query
         * @return bool
         */
        public function nextHistoryLine() {
                # Polymorphic function name to distinguish foreign and local fetches
                $fname = static::class . '::' . __FUNCTION__;

                $dbr = $this->repo->getReplicaDB();

                if ( $this->historyLine == 0 ) { // called for the first time, return line from cur
                        $fileQuery = self::getQueryInfo();
                        $this->historyRes = $dbr->select( $fileQuery['tables'],
                                $fileQuery['fields'] + [
                                        'oi_archive_name' => $dbr->addQuotes( '' ),
                                        'oi_deleted' => 0,
                                ],
                                [ 'img_name' => $this->title->getDBkey() ],
                                $fname,
                                [],
                                $fileQuery['joins']
                        );

                        if ( $dbr->numRows( $this->historyRes ) == 0 ) {
                                $this->historyRes = null;

                                return false;
                        }
                } elseif ( $this->historyLine == 1 ) {
                        $fileQuery = OldLocalFile::getQueryInfo();
                        $this->historyRes = $dbr->select(
                                $fileQuery['tables'],
                                $fileQuery['fields'],
                                [ 'oi_name' => $this->title->getDBkey() ],
                                $fname,
                                [ 'ORDER BY' => 'oi_timestamp DESC' ],
                                $fileQuery['joins']
                        );
                }
                $this->historyLine++;

                return $dbr->fetchObject( $this->historyRes );
        }

        /**
         * Reset the history pointer to the first element of the history
         */
        public function resetHistory() {
                $this->historyLine = 0;

                if ( !is_null( $this->historyRes ) ) {
                        $this->historyRes = null;
                }
        }

        /** getHashPath inherited */
        /** getRel inherited */
        /** getUrlRel inherited */
        /** getArchiveRel inherited */
        /** getArchivePath inherited */
        /** getThumbPath inherited */
        /** getArchiveUrl inherited */
        /** getThumbUrl inherited */
        /** getArchiveVirtualUrl inherited */
        /** getThumbVirtualUrl inherited */
        /** isHashed inherited */

        /**
         * Upload a file and record it in the DB
         * @param string|FSFile $src Source storage path, virtual URL, or filesystem path
         * @param string $comment Upload description
         * @param string $pageText Text to use for the new description page,
         *   if a new description page is created
         * @param int|bool $flags Flags for publish()
         * @param array|bool $props File properties, if known. This can be used to
         *   reduce the upload time when uploading virtual URLs for which the file
         *   info is already known
         * @param string|bool $timestamp Timestamp for img_timestamp, or false to use the
         *   current time
         * @param User|null $user User object or null to use $wgUser
         * @param string[] $tags Change tags to add to the log entry and page revision.
         *   (This doesn't check $user's permissions.)
         * @param bool $createNullRevision Set to false to avoid creation of a null revision on file
         *   upload, see T193621
         * @param bool $revert If this file upload is a revert
         * @return Status On success, the value member contains the
         *     archive name, or an empty string if it was a new file.
         */
        function upload( $src, $comment, $pageText, $flags = 0, $props = false,
                $timestamp = false, $user = null, $tags = [],
                $createNullRevision = true, $revert = false
        ) {
                if ( $this->getRepo()->getReadOnlyReason() !== false ) {
                        return $this->readOnlyFatalStatus();
                } elseif ( MediaWikiServices::getInstance()->getRevisionStore()->isReadOnly() ) {
                        // Check this in advance to avoid writing to FileBackend and the file tables,
                        // only to fail on insert the revision due to the text store being unavailable.
                        return $this->readOnlyFatalStatus();
                }

                $srcPath = ( $src instanceof FSFile ) ? $src->getPath() : $src;
                if ( !$props ) {
                        if ( FileRepo::isVirtualUrl( $srcPath )
                                || FileBackend::isStoragePath( $srcPath )
                        ) {
                                $props = $this->repo->getFileProps( $srcPath );
                        } else {
                                $mwProps = new MWFileProps( MediaWikiServices::getInstance()->getMimeAnalyzer() );
                                $props = $mwProps->getPropsFromPath( $srcPath, true );
                        }
                }

                $options = [];
                $handler = MediaHandler::getHandler( $props['mime'] );
                if ( $handler ) {
                        $metadata = AtEase::quietCall( 'unserialize', $props['metadata'] );

                        if ( !is_array( $metadata ) ) {
                                $metadata = [];
                        }

                        $options['headers'] = $handler->getContentHeaders( $metadata );
                } else {
                        $options['headers'] = [];
                }

                // Trim spaces on user supplied text
                $comment = trim( $comment );

                $this->lock();
                $status = $this->publish( $src, $flags, $options );

                if ( $status->successCount >= 2 ) {
                        // There will be a copy+(one of move,copy,store).
                        // The first succeeding does not commit us to updating the DB
                        // since it simply copied the current version to a timestamped file name.
                        // It is only *preferable* to avoid leaving such files orphaned.
                        // Once the second operation goes through, then the current version was
                        // updated and we must therefore update the DB too.
                        $oldver = $status->value;
                        $uploadStatus = $this->recordUpload2(
                                $oldver,
                                $comment,
                                $pageText,
                                $props,
                                $timestamp,
                                $user,
                                $tags,
                                $createNullRevision,
                                $revert
                        );
                        if ( !$uploadStatus->isOK() ) {
                                if ( $uploadStatus->hasMessage( 'filenotfound' ) ) {
                                        // update filenotfound error with more specific path
                                        $status->fatal( 'filenotfound', $srcPath );
                                } else {
                                        $status->merge( $uploadStatus );
                                }
                        }
                }

                $this->unlock();
                return $status;
        }

        /**
         * Record a file upload in the upload log and the image table
         * @param string $oldver
         * @param string $desc
         * @param string $license
         * @param string $copyStatus
         * @param string $source
         * @param bool $watch
         * @param string|bool $timestamp
         * @param User|null $user User object or null to use $wgUser
         * @return bool
         */
        function recordUpload( $oldver, $desc, $license = '', $copyStatus = '', $source = '',
                $watch = false, $timestamp = false, User $user = null ) {
                if ( !$user ) {
                        global $wgUser;
                        $user = $wgUser;
                }

                $pageText = SpecialUpload::getInitialPageText( $desc, $license, $copyStatus, $source );

                if ( !$this->recordUpload2( $oldver, $desc, $pageText, false, $timestamp, $user )->isOK() ) {
                        return false;
                }

                if ( $watch ) {
                        $user->addWatch( $this->getTitle() );
                }

                return true;
        }

        /**
         * Record a file upload in the upload log and the image table
         * @param string $oldver
         * @param string $comment
         * @param string $pageText
         * @param bool|array $props
         * @param string|bool $timestamp
         * @param null|User $user
         * @param string[] $tags
         * @param bool $createNullRevision Set to false to avoid creation of a null revision on file
         *   upload, see T193621
         * @param bool $revert If this file upload is a revert
         * @return Status
         */
        function recordUpload2(
                $oldver, $comment, $pageText, $props = false, $timestamp = false, $user = null, $tags = [],
                $createNullRevision = true, $revert = false
        ) {
                global $wgActorTableSchemaMigrationStage;

                if ( is_null( $user ) ) {
                        global $wgUser;
                        $user = $wgUser;
                }

                $dbw = $this->repo->getMasterDB();

                # Imports or such might force a certain timestamp; otherwise we generate
                # it and can fudge it slightly to keep (name,timestamp) unique on re-upload.
                if ( $timestamp === false ) {
                        $timestamp = $dbw->timestamp();
                        $allowTimeKludge = true;
                } else {
                        $allowTimeKludge = false;
                }

                $props = $props ?: $this->repo->getFileProps( $this->getVirtualUrl() );
                $props['description'] = $comment;
                $props['user'] = $user->getId();
                $props['user_text'] = $user->getName();
                $props['actor'] = $user->getActorId( $dbw );
                $props['timestamp'] = wfTimestamp( TS_MW, $timestamp ); // DB -> TS_MW
                $this->setProps( $props );

                # Fail now if the file isn't there
                if ( !$this->fileExists ) {
                        wfDebug( __METHOD__ . ": File " . $this->getRel() . " went missing!\n" );

                        return Status::newFatal( 'filenotfound', $this->getRel() );
                }

                $dbw->startAtomic( __METHOD__ );

                # Test to see if the row exists using INSERT IGNORE
                # This avoids race conditions by locking the row until the commit, and also
                # doesn't deadlock. SELECT FOR UPDATE causes a deadlock for every race condition.
                $commentStore = MediaWikiServices::getInstance()->getCommentStore();
                $commentFields = $commentStore->insert( $dbw, 'img_description', $comment );
                $actorMigration = ActorMigration::newMigration();
                $actorFields = $actorMigration->getInsertValues( $dbw, 'img_user', $user );
                $dbw->insert( 'image',
                        [
                                'img_name' => $this->getName(),
                                'img_size' => $this->size,
                                'img_width' => intval( $this->width ),
                                'img_height' => intval( $this->height ),
                                'img_bits' => $this->bits,
                                'img_media_type' => $this->media_type,
                                'img_major_mime' => $this->major_mime,
                                'img_minor_mime' => $this->minor_mime,
                                'img_timestamp' => $timestamp,
                                'img_metadata' => $dbw->encodeBlob( $this->metadata ),
                                'img_sha1' => $this->sha1
                        ] + $commentFields + $actorFields,
                        __METHOD__,
                        [ 'IGNORE' ]
                );
                $reupload = ( $dbw->affectedRows() == 0 );

                if ( $reupload ) {
                        $row = $dbw->selectRow(
                                'image',
                                [ 'img_timestamp', 'img_sha1' ],
                                [ 'img_name' => $this->getName() ],
                                __METHOD__,
                                [ 'LOCK IN SHARE MODE' ]
                        );

                        if ( $row && $row->img_sha1 === $this->sha1 ) {
                                $dbw->endAtomic( __METHOD__ );
                                wfDebug( __METHOD__ . ": File " . $this->getRel() . " already exists!\n" );
                                $title = Title::newFromText( $this->getName(), NS_FILE );
                                return Status::newFatal( 'fileexists-no-change', $title->getPrefixedText() );
                        }

                        if ( $allowTimeKludge ) {
                                # Use LOCK IN SHARE MODE to ignore any transaction snapshotting
                                $lUnixtime = $row ? wfTimestamp( TS_UNIX, $row->img_timestamp ) : false;
                                # Avoid a timestamp that is not newer than the last version
                                # TODO: the image/oldimage tables should be like page/revision with an ID field
                                if ( $lUnixtime && wfTimestamp( TS_UNIX, $timestamp ) <= $lUnixtime ) {
                                        sleep( 1 ); // fast enough re-uploads would go far in the future otherwise
                                        $timestamp = $dbw->timestamp( $lUnixtime + 1 );
                                        $this->timestamp = wfTimestamp( TS_MW, $timestamp ); // DB -> TS_MW
                                }
                        }

                        $tables = [ 'image' ];
                        $fields = [
                                'oi_name' => 'img_name',
                                'oi_archive_name' => $dbw->addQuotes( $oldver ),
                                'oi_size' => 'img_size',
                                'oi_width' => 'img_width',
                                'oi_height' => 'img_height',
                                'oi_bits' => 'img_bits',
                                'oi_description_id' => 'img_description_id',
                                'oi_timestamp' => 'img_timestamp',
                                'oi_metadata' => 'img_metadata',
                                'oi_media_type' => 'img_media_type',
                                'oi_major_mime' => 'img_major_mime',
                                'oi_minor_mime' => 'img_minor_mime',
                                'oi_sha1' => 'img_sha1',
                        ];
                        $joins = [];

                        if ( $wgActorTableSchemaMigrationStage & SCHEMA_COMPAT_WRITE_OLD ) {
                                $fields['oi_user'] = 'img_user';
                                $fields['oi_user_text'] = 'img_user_text';
                        }
                        if ( $wgActorTableSchemaMigrationStage & SCHEMA_COMPAT_WRITE_NEW ) {
                                $fields['oi_actor'] = 'img_actor';
                        }

                        if (
                                ( $wgActorTableSchemaMigrationStage & SCHEMA_COMPAT_WRITE_BOTH ) === SCHEMA_COMPAT_WRITE_BOTH
                        ) {
                                // Upgrade any rows that are still old-style. Otherwise an upgrade
                                // might be missed if a deletion happens while the migration script
                                // is running.
                                $res = $dbw->select(
                                        [ 'image' ],
                                        [ 'img_name', 'img_user', 'img_user_text' ],
                                        [ 'img_name' => $this->getName(), 'img_actor' => 0 ],
                                        __METHOD__
                                );
                                foreach ( $res as $row ) {
                                        $actorId = User::newFromAnyId( $row->img_user, $row->img_user_text, null )->getActorId( $dbw );
                                        $dbw->update(
                                                'image',
                                                [ 'img_actor' => $actorId ],
                                                [ 'img_name' => $row->img_name, 'img_actor' => 0 ],
                                                __METHOD__
                                        );
                                }
                        }

                        # (T36993) Note: $oldver can be empty here, if the previous
                        # version of the file was broken. Allow registration of the new
                        # version to continue anyway, because that's better than having
                        # an image that's not fixable by user operations.
                        # Collision, this is an update of a file
                        # Insert previous contents into oldimage
                        $dbw->insertSelect( 'oldimage', $tables, $fields,
                                [ 'img_name' => $this->getName() ], __METHOD__, [], [], $joins );

                        # Update the current image row
                        $dbw->update( 'image',
                                [
                                        'img_size' => $this->size,
                                        'img_width' => intval( $this->width ),
                                        'img_height' => intval( $this->height ),
                                        'img_bits' => $this->bits,
                                        'img_media_type' => $this->media_type,
                                        'img_major_mime' => $this->major_mime,
                                        'img_minor_mime' => $this->minor_mime,
                                        'img_timestamp' => $timestamp,
                                        'img_metadata' => $dbw->encodeBlob( $this->metadata ),
                                        'img_sha1' => $this->sha1
                                ] + $commentFields + $actorFields,
                                [ 'img_name' => $this->getName() ],
                                __METHOD__
                        );
                }

                $descTitle = $this->getTitle();
                $descId = $descTitle->getArticleID();
                $wikiPage = new WikiFilePage( $descTitle );
                $wikiPage->setFile( $this );

                // Determine log action. If reupload is done by reverting, use a special log_action.
                if ( $revert === true ) {
                        $logAction = 'revert';
                } elseif ( $reupload === true ) {
                        $logAction = 'overwrite';
                } else {
                        $logAction = 'upload';
                }
                // Add the log entry...
                $logEntry = new ManualLogEntry( 'upload', $logAction );
                $logEntry->setTimestamp( $this->timestamp );
                $logEntry->setPerformer( $user );
                $logEntry->setComment( $comment );
                $logEntry->setTarget( $descTitle );
                // Allow people using the api to associate log entries with the upload.
                // Log has a timestamp, but sometimes different from upload timestamp.
                $logEntry->setParameters(
                        [
                                'img_sha1' => $this->sha1,
                                'img_timestamp' => $timestamp,
                        ]
                );
                // Note we keep $logId around since during new image
                // creation, page doesn't exist yet, so log_page = 0
                // but we want it to point to the page we're making,
                // so we later modify the log entry.
                // For a similar reason, we avoid making an RC entry
                // now and wait until the page exists.
                $logId = $logEntry->insert();

                if ( $descTitle->exists() ) {
                        // Use own context to get the action text in content language
                        $formatter = LogFormatter::newFromEntry( $logEntry );
                        $formatter->setContext( RequestContext::newExtraneousContext( $descTitle ) );
                        $editSummary = $formatter->getPlainActionText();

                        $nullRevision = $createNullRevision === false ? null : Revision::newNullRevision(
                                $dbw,
                                $descId,
                                $editSummary,
                                false,
                                $user
                        );
                        if ( $nullRevision ) {
                                $nullRevision->insertOn( $dbw );
                                Hooks::run(
                                        'NewRevisionFromEditComplete',
                                        [ $wikiPage, $nullRevision, $nullRevision->getParentId(), $user ]
                                );
                                $wikiPage->updateRevisionOn( $dbw, $nullRevision );
                                // Associate null revision id
                                $logEntry->setAssociatedRevId( $nullRevision->getId() );
                        }

                        $newPageContent = null;
                } else {
                        // Make the description page and RC log entry post-commit
                        $newPageContent = ContentHandler::makeContent( $pageText, $descTitle );
                }

                # Defer purges, page creation, and link updates in case they error out.
                # The most important thing is that files and the DB registry stay synced.
                $dbw->endAtomic( __METHOD__ );
                $fname = __METHOD__;

                # Do some cache purges after final commit so that:
                # a) Changes are more likely to be seen post-purge
                # b) They won't cause rollback of the log publish/update above
                DeferredUpdates::addUpdate(
                        new AutoCommitUpdate(
                                $dbw,
                                __METHOD__,
                                function () use (
                                        $reupload, $wikiPage, $newPageContent, $comment, $user,
                                        $logEntry, $logId, $descId, $tags, $fname
                                ) {
                                        # Update memcache after the commit
                                        $this->invalidateCache();

                                        $updateLogPage = false;
                                        if ( $newPageContent ) {
                                                # New file page; create the description page.
                                                # There's already a log entry, so don't make a second RC entry
                                                # CDN and file cache for the description page are purged by doEditContent.
                                                $status = $wikiPage->doEditContent(
                                                        $newPageContent,
                                                        $comment,
                                                        EDIT_NEW | EDIT_SUPPRESS_RC,
                                                        false,
                                                        $user
                                                );

                                                if ( isset( $status->value['revision'] ) ) {
                                                        /** @var Revision $rev */
                                                        $rev = $status->value['revision'];
                                                        // Associate new page revision id
                                                        $logEntry->setAssociatedRevId( $rev->getId() );
                                                }
                                                // This relies on the resetArticleID() call in WikiPage::insertOn(),
                                                // which is triggered on $descTitle by doEditContent() above.
                                                if ( isset( $status->value['revision'] ) ) {
                                                        /** @var Revision $rev */
                                                        $rev = $status->value['revision'];
                                                        $updateLogPage = $rev->getPage();
                                                }
                                        } else {
                                                # Existing file page: invalidate description page cache
                                                $title = $wikiPage->getTitle();
                                                $title->invalidateCache();
                                                MediaWikiServices::getInstance()->getHtmlCacheUpdater()->purge( $title );
                                                # Allow the new file version to be patrolled from the page footer
                                                Article::purgePatrolFooterCache( $descId );
                                        }

                                        # Update associated rev id. This should be done by $logEntry->insert() earlier,
                                        # but setAssociatedRevId() wasn't called at that point yet...
                                        $logParams = $logEntry->getParameters();
                                        $logParams['associated_rev_id'] = $logEntry->getAssociatedRevId();
                                        $update = [ 'log_params' => LogEntryBase::makeParamBlob( $logParams ) ];
                                        if ( $updateLogPage ) {
                                                # Also log page, in case where we just created it above
                                                $update['log_page'] = $updateLogPage;
                                        }
                                        $this->getRepo()->getMasterDB()->update(
                                                'logging',
                                                $update,
                                                [ 'log_id' => $logId ],
                                                $fname
                                        );
                                        $this->getRepo()->getMasterDB()->insert(
                                                'log_search',
                                                [
                                                        'ls_field' => 'associated_rev_id',
                                                        'ls_value' => $logEntry->getAssociatedRevId(),
                                                        'ls_log_id' => $logId,
                                                ],
                                                $fname
                                        );

                                        # Add change tags, if any
                                        if ( $tags ) {
                                                $logEntry->setTags( $tags );
                                        }

                                        # Uploads can be patrolled
                                        $logEntry->setIsPatrollable( true );

                                        # Now that the log entry is up-to-date, make an RC entry.
                                        $logEntry->publish( $logId );

                                        # Run hook for other updates (typically more cache purging)
                                        Hooks::run( 'FileUpload', [ $this, $reupload, !$newPageContent ] );

                                        if ( $reupload ) {
                                                # Delete old thumbnails
                                                $this->purgeThumbnails();
                                                # Remove the old file from the CDN cache
                                                MediaWikiServices::getInstance()
                                                        ->getHtmlCacheUpdater()->purge( $this->getUrl() );
                                        } else {
                                                # Update backlink pages pointing to this title if created
                                                LinksUpdate::queueRecursiveJobsForTable(
                                                        $this->getTitle(),
                                                        'imagelinks',
                                                        'upload-image',
                                                        $user->getName()
                                                );
                                        }

                                        $this->prerenderThumbnails();
                                }
                        ),
                        DeferredUpdates::PRESEND
                );

                if ( !$reupload ) {
                        # This is a new file, so update the image count
                        DeferredUpdates::addUpdate( SiteStatsUpdate::factory( [ 'images' => 1 ] ) );
                }

                # Invalidate cache for all pages using this file
                $job = HTMLCacheUpdateJob::newForBacklinks(
                        $this->getTitle(),
                        'imagelinks',
                        [ 'causeAction' => 'file-upload', 'causeAgent' => $user->getName() ]
                );
                JobQueueGroup::singleton()->lazyPush( $job );

                return Status::newGood();
        }

        /**
         * Move or copy a file to its public location. If a file exists at the
         * destination, move it to an archive. Returns a Status object with
         * the archive name in the "value" member on success.
         *
         * The archive name should be passed through to recordUpload for database
         * registration.
         *
         * @param string|FSFile $src Local filesystem path or virtual URL to the source image
         * @param int $flags A bitwise combination of:
         *     File::DELETE_SOURCE    Delete the source file, i.e. move rather than copy
         * @param array $options Optional additional parameters
         * @return Status On success, the value member contains the
         *     archive name, or an empty string if it was a new file.
         */
        function publish( $src, $flags = 0, array $options = [] ) {
                return $this->publishTo( $src, $this->getRel(), $flags, $options );
        }

        /**
         * Move or copy a file to a specified location. Returns a Status
         * object with the archive name in the "value" member on success.
         *
         * The archive name should be passed through to recordUpload for database
         * registration.
         *
         * @param string|FSFile $src Local filesystem path or virtual URL to the source image
         * @param string $dstRel Target relative path
         * @param int $flags A bitwise combination of:
         *     File::DELETE_SOURCE    Delete the source file, i.e. move rather than copy
         * @param array $options Optional additional parameters
         * @return Status On success, the value member contains the
         *     archive name, or an empty string if it was a new file.
         */
        function publishTo( $src, $dstRel, $flags = 0, array $options = [] ) {
                $srcPath = ( $src instanceof FSFile ) ? $src->getPath() : $src;

                $repo = $this->getRepo();
                if ( $repo->getReadOnlyReason() !== false ) {
                        return $this->readOnlyFatalStatus();
                }

                $this->lock();

                if ( $this->isOld() ) {
                        $archiveRel = $dstRel;
                        $archiveName = basename( $archiveRel );
                } else {
                        $archiveName = wfTimestamp( TS_MW ) . '!' . $this->getName();
                        $archiveRel = $this->getArchiveRel( $archiveName );
                }

                if ( $repo->hasSha1Storage() ) {
                        $sha1 = FileRepo::isVirtualUrl( $srcPath )
                                ? $repo->getFileSha1( $srcPath )
                                : FSFile::getSha1Base36FromPath( $srcPath );
                        /** @var FileBackendDBRepoWrapper $wrapperBackend */
                        $wrapperBackend = $repo->getBackend();
                        $dst = $wrapperBackend->getPathForSHA1( $sha1 );
                        $status = $repo->quickImport( $src, $dst );
                        if ( $flags & File::DELETE_SOURCE ) {
                                unlink( $srcPath );
                        }

                        if ( $this->exists() ) {
                                $status->value = $archiveName;
                        }
                } else {
                        $flags = $flags & File::DELETE_SOURCE ? LocalRepo::DELETE_SOURCE : 0;
                        $status = $repo->publish( $srcPath, $dstRel, $archiveRel, $flags, $options );

                        if ( $status->value == 'new' ) {
                                $status->value = '';
                        } else {
                                $status->value = $archiveName;
                        }
                }

                $this->unlock();
                return $status;
        }

        /** getLinksTo inherited */
        /** getExifData inherited */
        /** isLocal inherited */
        /** wasDeleted inherited */

        /**
         * Move file to the new title
         *
         * Move current, old version and all thumbnails
         * to the new filename. Old file is deleted.
         *
         * Cache purging is done; checks for validity
         * and logging are caller's responsibility
         *
         * @param Title $target New file name
         * @return Status
         */
        function move( $target ) {
                $localRepo = MediaWikiServices::getInstance()->getRepoGroup()->getLocalRepo();
                if ( $this->getRepo()->getReadOnlyReason() !== false ) {
                        return $this->readOnlyFatalStatus();
                }

                wfDebugLog( 'imagemove', "Got request to move {$this->name} to " . $target->getText() );
                $batch = new LocalFileMoveBatch( $this, $target );

                $this->lock();
                $batch->addCurrent();
                $archiveNames = $batch->addOlds();
                $status = $batch->execute();
                $this->unlock();

                wfDebugLog( 'imagemove', "Finished moving {$this->name}" );

                // Purge the source and target files...
                $oldTitleFile = $localRepo->newFile( $this->title );
                $newTitleFile = $localRepo->newFile( $target );
                // To avoid slow purges in the transaction, move them outside...
                DeferredUpdates::addUpdate(
                        new AutoCommitUpdate(
                                $this->getRepo()->getMasterDB(),
                                __METHOD__,
                                function () use ( $oldTitleFile, $newTitleFile, $archiveNames ) {
                                        $oldTitleFile->purgeEverything();
                                        foreach ( $archiveNames as $archiveName ) {
                                                $oldTitleFile->purgeOldThumbnails( $archiveName );
                                        }
                                        $newTitleFile->purgeEverything();
                                }
                        ),
                        DeferredUpdates::PRESEND
                );

                if ( $status->isOK() ) {
                        // Now switch the object
                        $this->title = $target;
                        // Force regeneration of the name and hashpath
                        unset( $this->name );
                        unset( $this->hashPath );
                }

                return $status;
        }

        /**
         * Delete all versions of the file.
         *
         * Moves the files into an archive directory (or deletes them)
         * and removes the database rows.
         *
         * Cache purging is done; logging is caller's responsibility.
         *
         * @param string $reason
         * @param bool $suppress
         * @param User|null $user
         * @return Status
         */
        function delete( $reason, $suppress = false, $user = null ) {
                if ( $this->getRepo()->getReadOnlyReason() !== false ) {
                        return $this->readOnlyFatalStatus();
                }

                $batch = new LocalFileDeleteBatch( $this, $reason, $suppress, $user );

                $this->lock();
                $batch->addCurrent();
                // Get old version relative paths
                $archiveNames = $batch->addOlds();
                $status = $batch->execute();
                $this->unlock();

                if ( $status->isOK() ) {
                        DeferredUpdates::addUpdate( SiteStatsUpdate::factory( [ 'images' => -1 ] ) );
                }

                // To avoid slow purges in the transaction, move them outside...
                DeferredUpdates::addUpdate(
                        new AutoCommitUpdate(
                                $this->getRepo()->getMasterDB(),
                                __METHOD__,
                                function () use ( $archiveNames ) {
                                        $this->purgeEverything();
                                        foreach ( $archiveNames as $archiveName ) {
                                                $this->purgeOldThumbnails( $archiveName );
                                        }
                                }
                        ),
                        DeferredUpdates::PRESEND
                );

                // Purge the CDN
                $purgeUrls = [];
                foreach ( $archiveNames as $archiveName ) {
                        $purgeUrls[] = $this->getArchiveUrl( $archiveName );
                }
                MediaWikiServices::getInstance()->getHtmlCacheUpdater()->purge( $purgeUrls );

                return $status;
        }

        /**
         * Delete an old version of the file.
         *
         * Moves the file into an archive directory (or deletes it)
         * and removes the database row.
         *
         * Cache purging is done; logging is caller's responsibility.
         *
         * @param string $archiveName
         * @param string $reason
         * @param bool $suppress
         * @param User|null $user
         * @throws MWException Exception on database or file store failure
         * @return Status
         */
        function deleteOld( $archiveName, $reason, $suppress = false, $user = null ) {
                if ( $this->getRepo()->getReadOnlyReason() !== false ) {
                        return $this->readOnlyFatalStatus();
                }

                $batch = new LocalFileDeleteBatch( $this, $reason, $suppress, $user );

                $this->lock();
                $batch->addOld( $archiveName );
                $status = $batch->execute();
                $this->unlock();

                $this->purgeOldThumbnails( $archiveName );
                if ( $status->isOK() ) {
                        $this->purgeDescription();
                }

                $url = $this->getArchiveUrl( $archiveName );
                MediaWikiServices::getInstance()->getHtmlCacheUpdater()->purge( $url );

                return $status;
        }

        /**
         * Restore all or specified deleted revisions to the given file.
         * Permissions and logging are left to the caller.
         *
         * May throw database exceptions on error.
         *
         * @param array $versions Set of record ids of deleted items to restore,
         *   or empty to restore all revisions.
         * @param bool $unsuppress
         * @return Status
         */
        function restore( $versions = [], $unsuppress = false ) {
                if ( $this->getRepo()->getReadOnlyReason() !== false ) {
                        return $this->readOnlyFatalStatus();
                }

                $batch = new LocalFileRestoreBatch( $this, $unsuppress );

                $this->lock();
                if ( !$versions ) {
                        $batch->addAll();
                } else {
                        $batch->addIds( $versions );
                }
                $status = $batch->execute();
                if ( $status->isGood() ) {
                        $cleanupStatus = $batch->cleanup();
                        $cleanupStatus->successCount = 0;
                        $cleanupStatus->failCount = 0;
                        $status->merge( $cleanupStatus );
                }

                $this->unlock();
                return $status;
        }

        /** isMultipage inherited */
        /** pageCount inherited */
        /** scaleHeight inherited */
        /** getImageSize inherited */

        /**
         * Get the URL of the file description page.
         * @return string
         */
        function getDescriptionUrl() {
                return $this->title->getLocalURL();
        }

        /**
         * Get the HTML text of the description page
         * This is not used by ImagePage for local files, since (among other things)
         * it skips the parser cache.
         *
         * @param Language|null $lang What language to get description in (Optional)
         * @return string|false
         */
        function getDescriptionText( Language $lang = null ) {
                $store = MediaWikiServices::getInstance()->getRevisionStore();
                $revision = $store->getRevisionByTitle( $this->title, 0, Revision::READ_NORMAL );
                if ( !$revision ) {
                        return false;
                }

                $renderer = MediaWikiServices::getInstance()->getRevisionRenderer();
                $rendered = $renderer->getRenderedRevision( $revision, new ParserOptions( null, $lang ) );

                if ( !$rendered ) {
                        // audience check failed
                        return false;
                }

                $pout = $rendered->getRevisionParserOutput();
                return $pout->getText();
        }

        /**
         * @param int $audience
         * @param User|null $user
         * @return string
         */
        function getDescription( $audience = self::FOR_PUBLIC, User $user = null ) {
                $this->load();
                if ( $audience == self::FOR_PUBLIC && $this->isDeleted( self::DELETED_COMMENT ) ) {
                        return '';
                } elseif ( $audience == self::FOR_THIS_USER
                        && !$this->userCan( self::DELETED_COMMENT, $user )
                ) {
                        return '';
                } else {
                        return $this->description;
                }
        }

        /**
         * @return bool|string
         */
        function getTimestamp() {
                $this->load();

                return $this->timestamp;
        }

        /**
         * @return bool|string
         */
        public function getDescriptionTouched() {
                // The DB lookup might return false, e.g. if the file was just deleted, or the shared DB repo
                // itself gets it from elsewhere. To avoid repeating the DB lookups in such a case, we
                // need to differentiate between null (uninitialized) and false (failed to load).
                if ( $this->descriptionTouched === null ) {
                        $cond = [
                                'page_namespace' => $this->title->getNamespace(),
                                'page_title' => $this->title->getDBkey()
                        ];
                        $touched = $this->repo->getReplicaDB()->selectField( 'page', 'page_touched', $cond, __METHOD__ );
                        $this->descriptionTouched = $touched ? wfTimestamp( TS_MW, $touched ) : false;
                }

                return $this->descriptionTouched;
        }

        /**
         * @return string
         */
        function getSha1() {
                $this->load();
                // Initialise now if necessary
                if ( $this->sha1 == '' && $this->fileExists ) {
                        $this->lock();

                        $this->sha1 = $this->repo->getFileSha1( $this->getPath() );
                        if ( !wfReadOnly() && strval( $this->sha1 ) != '' ) {
                                $dbw = $this->repo->getMasterDB();
                                $dbw->update( 'image',
                                        [ 'img_sha1' => $this->sha1 ],
                                        [ 'img_name' => $this->getName() ],
                                        __METHOD__ );
                                $this->invalidateCache();
                        }

                        $this->unlock();
                }

                return $this->sha1;
        }

        /**
         * @return bool Whether to cache in RepoGroup (this avoids OOMs)
         */
        function isCacheable() {
                $this->load();

                // If extra data (metadata) was not loaded then it must have been large
                return $this->extraDataLoaded
                        && strlen( serialize( $this->metadata ) ) <= self::CACHE_FIELD_MAX_LEN;
        }

        /**
         * @return Status
         * @since 1.28
         */
        public function acquireFileLock() {
                return Status::wrap( $this->getRepo()->getBackend()->lockFiles(
                        [ $this->getPath() ], LockManager::LOCK_EX, 10
                ) );
        }

        /**
         * @return Status
         * @since 1.28
         */
        public function releaseFileLock() {
                return Status::wrap( $this->getRepo()->getBackend()->unlockFiles(
                        [ $this->getPath() ], LockManager::LOCK_EX
                ) );
        }

        /**
         * Start an atomic DB section and lock the image for update
         * or increments a reference counter if the lock is already held
         *
         * This method should not be used outside of LocalFile/LocalFile*Batch
         *
         * @throws LocalFileLockError Throws an error if the lock was not acquired
         * @return bool Whether the file lock owns/spawned the DB transaction
         */
        public function lock() {
                if ( !$this->locked ) {
                        $logger = LoggerFactory::getInstance( 'LocalFile' );

                        $dbw = $this->repo->getMasterDB();
                        $makesTransaction = !$dbw->trxLevel();
                        $dbw->startAtomic( self::ATOMIC_SECTION_LOCK );
                        // T56736: use simple lock to handle when the file does not exist.
                        // SELECT FOR UPDATE prevents changes, not other SELECTs with FOR UPDATE.
                        // Also, that would cause contention on INSERT of similarly named rows.
                        $status = $this->acquireFileLock(); // represents all versions of the file
                        if ( !$status->isGood() ) {
                                $dbw->endAtomic( self::ATOMIC_SECTION_LOCK );
                                $logger->warning( "Failed to lock '{file}'", [ 'file' => $this->name ] );

                                throw new LocalFileLockError( $status );
                        }
                        // Release the lock *after* commit to avoid row-level contention.
                        // Make sure it triggers on rollback() as well as commit() (T132921).
                        $dbw->onTransactionResolution(
                                function () use ( $logger ) {
                                        $status = $this->releaseFileLock();
                                        if ( !$status->isGood() ) {
                                                $logger->error( "Failed to unlock '{file}'", [ 'file' => $this->name ] );
                                        }
                                },
                                __METHOD__
                        );
                        // Callers might care if the SELECT snapshot is safely fresh
                        $this->lockedOwnTrx = $makesTransaction;
                }

                $this->locked++;

                return $this->lockedOwnTrx;
        }

        /**
         * Decrement the lock reference count and end the atomic section if it reaches zero
         *
         * This method should not be used outside of LocalFile/LocalFile*Batch
         *
         * The commit and loc release will happen when no atomic sections are active, which
         * may happen immediately or at some point after calling this
         */
        public function unlock() {
                if ( $this->locked ) {
                        --$this->locked;
                        if ( !$this->locked ) {
                                $dbw = $this->repo->getMasterDB();
                                $dbw->endAtomic( self::ATOMIC_SECTION_LOCK );
                                $this->lockedOwnTrx = false;
                        }
                }
        }

        /**
         * @return Status
         */
        protected function readOnlyFatalStatus() {
                return $this->getRepo()->newFatal( 'filereadonlyerror', $this->getName(),
                        $this->getRepo()->getName(), $this->getRepo()->getReadOnlyReason() );
        }

        /**
         * Clean up any dangling locks
         */
        function __destruct() {
                $this->unlock();
        }
}