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[mediawiki.git] / includes / filerepo / file / OldLocalFile.php

<?php
/**
 * 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
 */

use MediaWiki\FileRepo\File\FileSelectQueryBuilder;
use MediaWiki\MediaWikiServices;
use MediaWiki\Permissions\Authority;
use MediaWiki\Revision\RevisionRecord;
use MediaWiki\Status\Status;
use MediaWiki\Title\Title;
use MediaWiki\User\UserIdentity;
use Wikimedia\Rdbms\IDBAccessObject;
use Wikimedia\Rdbms\IReadableDatabase;
use Wikimedia\Rdbms\SelectQueryBuilder;

/**
 * Old file in the oldimage table.
 *
 * @stable to extend
 * @ingroup FileAbstraction
 */
class OldLocalFile extends LocalFile {
        /** @var string|int Timestamp */
        protected $requestedTime;

        /** @var string|null Archive name */
        protected $archive_name;

        public const CACHE_VERSION = 1;

        /**
         * @stable to override
         * @param Title $title
         * @param LocalRepo $repo
         * @param string|int|null $time
         * @return static
         */
        public static function newFromTitle( $title, $repo, $time = null ) {
                # The null default value is only here to avoid an E_STRICT
                if ( $time === null ) {
                        throw new InvalidArgumentException( __METHOD__ . ' got null for $time parameter' );
                }

                return new static( $title, $repo, $time, null );
        }

        /**
         * @stable to override
         *
         * @param Title $title
         * @param LocalRepo $repo
         * @param string $archiveName
         * @return static
         */
        public static function newFromArchiveName( $title, $repo, $archiveName ) {
                return new static( $title, $repo, null, $archiveName );
        }

        /**
         * @stable to override
         *
         * @param stdClass $row
         * @param LocalRepo $repo
         * @return static
         */
        public static function newFromRow( $row, $repo ) {
                $title = Title::makeTitle( NS_FILE, $row->oi_name );
                $file = new static( $title, $repo, null, $row->oi_archive_name );
                $file->loadFromRow( $row, 'oi_' );

                return $file;
        }

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

                $queryBuilder->where( [ 'oi_sha1' => $sha1 ] );
                if ( $timestamp ) {
                        $queryBuilder->andWhere( [ 'oi_timestamp' => $dbr->timestamp( $timestamp ) ] );
                }

                $row = $queryBuilder->caller( __METHOD__ )->fetchRow();
                if ( $row ) {
                        return static::newFromRow( $row, $repo );
                } else {
                        return false;
                }
        }

        /**
         * Return the tables, fields, and join conditions to be selected to create
         * a new oldlocalfile object.
         *
         * Since 1.34, oi_user and oi_user_text have not been present in the
         * database, but they continue to be available in query results as
         * aliases.
         *
         * @since 1.31
         * @stable to override
         *
         * @deprecated since 1.41 use FileSelectQueryBuilder instead
         * @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()` or `SelectQueryBuilder::tables`
         *   - fields: (string[]) to include in the `$vars` to `IDatabase->select()` or `SelectQueryBuilder::fields`
         *   - joins: (array) to include in the `$join_conds` to `IDatabase->select()` or `SelectQueryBuilder::joinConds`
         * @phan-return array{tables:string[],fields:string[],joins:array}
         */
        public static function getQueryInfo( array $options = [] ) {
                $dbr = MediaWikiServices::getInstance()->getConnectionProvider()->getReplicaDatabase();
                $queryInfo = FileSelectQueryBuilder::newForOldFile( $dbr, $options )->getQueryInfo();
                return [
                        'tables' => $queryInfo['tables'],
                        'fields' => $queryInfo['fields'],
                        'joins' => $queryInfo['join_conds'],
                ];
        }

        /**
         * @stable to call
         *
         * @param Title $title
         * @param LocalRepo $repo
         * @param string|int|null $time Timestamp or null to load by archive name
         * @param string|null $archiveName Archive name or null to load by timestamp
         */
        public function __construct( $title, $repo, $time, $archiveName ) {
                parent::__construct( $title, $repo );
                $this->requestedTime = $time;
                $this->archive_name = $archiveName;
                if ( $time === null && $archiveName === null ) {
                        throw new LogicException( __METHOD__ . ': must specify at least one of $time or $archiveName' );
                }
        }

        public function loadFromRow( $row, $prefix = 'img_' ) {
                $this->archive_name = $row->{"{$prefix}archive_name"};
                $this->deleted = $row->{"{$prefix}deleted"};
                $row = clone $row;
                unset( $row->{"{$prefix}archive_name"} );
                unset( $row->{"{$prefix}deleted"} );
                parent::loadFromRow( $row, $prefix );
        }

        /**
         * @stable to override
         * @return bool
         */
        protected function getCacheKey() {
                return false;
        }

        /**
         * @stable to override
         * @return string
         */
        public function getArchiveName() {
                if ( $this->archive_name === null ) {
                        $this->load();
                }

                return $this->archive_name;
        }

        /**
         * @return bool
         */
        public function isOld() {
                return true;
        }

        /**
         * @return bool
         */
        public function isVisible() {
                return $this->exists() && !$this->isDeleted( File::DELETED_FILE );
        }

        /**
         * @stable to override
         * @param int $flags
         */
        protected function loadFromDB( $flags = 0 ) {
                $this->dataLoaded = true;

                $dbr = ( $flags & IDBAccessObject::READ_LATEST )
                        ? $this->repo->getPrimaryDB()
                        : $this->repo->getReplicaDB();
                $queryBuilder = $this->buildQueryBuilderForLoad( $dbr, [] );
                $row = $queryBuilder->caller( __METHOD__ )->fetchRow();
                if ( $row ) {
                        $this->loadFromRow( $row, 'oi_' );
                } else {
                        $this->fileExists = false;
                }
        }

        /**
         * Load lazy file metadata from the DB
         * @stable to override
         */
        protected function loadExtraFromDB() {
                $this->extraDataLoaded = true;
                $dbr = $this->repo->getReplicaDB();
                $queryBuilder = $this->buildQueryBuilderForLoad( $dbr );

                // In theory the file could have just been renamed/deleted...oh well
                $row = $queryBuilder->caller( __METHOD__ )->fetchRow();

                if ( !$row ) { // fallback to primary DB
                        $dbr = $this->repo->getPrimaryDB();
                        $queryBuilder = $this->buildQueryBuilderForLoad( $dbr );
                        $row = $queryBuilder->caller( __METHOD__ )->fetchRow();
                }

                if ( $row ) {
                        foreach ( $this->unprefixRow( $row, 'oi_' ) as $name => $value ) {
                                $this->$name = $value;
                        }
                } else {
                        throw new RuntimeException( "Could not find data for image '{$this->archive_name}'." );
                }
        }

        private function buildQueryBuilderForLoad( IReadableDatabase $dbr, $options = [ 'omit-nonlazy' ] ) {
                $queryBuilder = FileSelectQueryBuilder::newForOldFile( $dbr, $options );
                $queryBuilder->where( [ 'oi_name' => $this->getName() ] )
                        ->orderBy( 'oi_timestamp', SelectQueryBuilder::SORT_DESC );
                if ( $this->requestedTime === null ) {
                        $queryBuilder->andWhere( [ 'oi_archive_name' => $this->archive_name ] );
                } else {
                        $queryBuilder->andWhere( [ 'oi_timestamp' => $dbr->timestamp( $this->requestedTime ) ] );
                }
                return $queryBuilder;
        }

        /**
         * @inheritDoc
         * @stable to override
         */
        protected function getCacheFields( $prefix = 'img_' ) {
                $fields = parent::getCacheFields( $prefix );
                $fields[] = $prefix . 'archive_name';
                $fields[] = $prefix . 'deleted';

                return $fields;
        }

        /**
         * @return string
         * @stable to override
         */
        public function getRel() {
                return $this->getArchiveRel( $this->getArchiveName() );
        }

        /**
         * @return string
         * @stable to override
         */
        public function getUrlRel() {
                return $this->getArchiveRel( rawurlencode( $this->getArchiveName() ) );
        }

        /**
         * @stable to override
         */
        public function upgradeRow() {
                $this->loadFromFile();

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

                        return;
                }

                $dbw = $this->repo->getPrimaryDB();
                [ $major, $minor ] = self::splitMime( $this->mime );

                wfDebug( __METHOD__ . ': upgrading ' . $this->archive_name . " to the current schema" );
                $dbw->newUpdateQueryBuilder()
                        ->update( 'oldimage' )
                        ->set( [
                                'oi_size' => $this->size,
                                'oi_width' => $this->width,
                                'oi_height' => $this->height,
                                'oi_bits' => $this->bits,
                                'oi_media_type' => $this->media_type,
                                'oi_major_mime' => $major,
                                'oi_minor_mime' => $minor,
                                'oi_metadata' => $this->getMetadataForDb( $dbw ),
                                'oi_sha1' => $this->sha1,
                        ] )
                        ->where( [
                                'oi_name' => $this->getName(),
                                'oi_archive_name' => $this->archive_name,
                        ] )
                        ->caller( __METHOD__ )->execute();
        }

        protected function reserializeMetadata() {
                // TODO: implement this and make it possible to hit it from refreshImageMetadata.php
                // It can be hit from action=purge but that's not very useful if the
                // goal is to reserialize the whole oldimage table.
        }

        /**
         * @param int $field One of DELETED_* bitfield constants for file or
         *   revision rows
         * @return bool
         */
        public function isDeleted( $field ) {
                $this->load();

                return ( $this->deleted & $field ) == $field;
        }

        /**
         * Returns bitfield value
         * @return int
         */
        public function getVisibility() {
                $this->load();

                return (int)$this->deleted;
        }

        /**
         * Determine if the current user is allowed to view a particular
         * field of this image file, if it's marked as deleted.
         *
         * @param int $field
         * @param Authority $performer User object to check
         * @return bool
         */
        public function userCan( $field, Authority $performer ) {
                $this->load();

                return RevisionRecord::userCanBitfield(
                        $this->deleted,
                        $field,
                        $performer
                );
        }

        /**
         * Upload a file directly into archive. Generally for Special:Import.
         *
         * @param string $srcPath File system path of the source file
         * @param string $timestamp
         * @param string $comment
         * @param UserIdentity $user
         * @return Status
         */
        public function uploadOld( $srcPath, $timestamp, $comment, UserIdentity $user ) {
                $archiveName = $this->getArchiveName();
                $dstRel = $this->getArchiveRel( $archiveName );
                $status = $this->publishTo( $srcPath, $dstRel );

                if ( $status->isGood() &&
                        !$this->recordOldUpload( $srcPath, $archiveName, $timestamp, $comment, $user )
                ) {
                        $status->fatal( 'filenotfound', $srcPath );
                }

                return $status;
        }

        /**
         * Record a file upload in the oldimage table, without adding log entries.
         * @stable to override
         *
         * @param string $srcPath File system path to the source file
         * @param string $archiveName The archive name of the file
         * @param string $timestamp
         * @param string $comment Upload comment
         * @param UserIdentity $user User who did this upload
         * @return bool
         */
        protected function recordOldUpload( $srcPath, $archiveName, $timestamp, $comment, $user ) {
                $dbw = $this->repo->getPrimaryDB();

                $services = MediaWikiServices::getInstance();
                $mwProps = new MWFileProps( $services->getMimeAnalyzer() );
                $props = $mwProps->getPropsFromPath( $srcPath, true );
                if ( !$props['fileExists'] ) {
                        return false;
                }
                $this->setProps( $props );

                $dbw->startAtomic( __METHOD__ );
                $commentFields = $services->getCommentStore()
                        ->insert( $dbw, 'oi_description', $comment );
                $actorId = $services->getActorNormalization()
                        ->acquireActorId( $user, $dbw );
                $dbw->newInsertQueryBuilder()
                        ->insertInto( 'oldimage' )
                        ->row( [
                                'oi_name' => $this->getName(),
                                'oi_archive_name' => $archiveName,
                                'oi_size' => $props['size'],
                                'oi_width' => intval( $props['width'] ),
                                'oi_height' => intval( $props['height'] ),
                                'oi_bits' => $props['bits'],
                                'oi_actor' => $actorId,
                                'oi_timestamp' => $dbw->timestamp( $timestamp ),
                                'oi_metadata' => $this->getMetadataForDb( $dbw ),
                                'oi_media_type' => $props['media_type'],
                                'oi_major_mime' => $props['major_mime'],
                                'oi_minor_mime' => $props['minor_mime'],
                                'oi_sha1' => $props['sha1'],
                        ] + $commentFields )
                        ->caller( __METHOD__ )->execute();
                $dbw->endAtomic( __METHOD__ );

                return true;
        }

        /**
         * If archive name is an empty string, then file does not "exist"
         *
         * This is the case for a couple files on Wikimedia servers where
         * the old version is "lost".
         * @return bool
         */
        public function exists() {
                $archiveName = $this->getArchiveName();
                if ( $archiveName === '' || !is_string( $archiveName ) ) {
                        return false;
                }
                return parent::exists();
        }
}