LocalFileDeleteBatch.php

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<?php
use MediaWiki\FileRepo\File\FileSelectQueryBuilder;
use MediaWiki\MediaWikiServices;
use MediaWiki\Revision\RevisionRecord;
use MediaWiki\Status\Status;
use MediaWiki\User\UserIdentity;
use Wikimedia\ScopedCallback;
 
class LocalFileDeleteBatch {
    private $file;
 
    private $reason;
 
    private $srcRels = [];
 
    private $archiveUrls = [];
 
    private $deletionBatch;
 
    private $suppress;
 
    private $user;
 
    public function __construct(
        File $file,
        UserIdentity $user,
        $reason = '',
        $suppress = false
    ) {
        $this->file = $file;
        $this->user = $user;
        $this->reason = $reason;
        $this->suppress = $suppress;
    }
 
    public function addCurrent() {
        $this->srcRels['.'] = $this->file->getRel();
    }
 
    public function addOld( $oldName ) {
        $this->srcRels[$oldName] = $this->file->getArchiveRel( $oldName );
        $this->archiveUrls[] = $this->file->getArchiveUrl( $oldName );
    }
 
    public function addOlds() {
        $archiveNames = [];
 
        $dbw = $this->file->repo->getPrimaryDB();
        $result = $dbw->newSelectQueryBuilder()
            ->select( [ 'oi_archive_name' ] )
            ->from( 'oldimage' )
            ->where( [ 'oi_name' => $this->file->getName() ] )
            ->caller( __METHOD__ )->fetchResultSet();
 
        foreach ( $result as $row ) {
            $this->addOld( $row->oi_archive_name );
            $archiveNames[] = $row->oi_archive_name;
        }
 
        return $archiveNames;
    }
 
    protected function getOldRels() {
        if ( !isset( $this->srcRels['.'] ) ) {
            $oldRels =& $this->srcRels;
            $deleteCurrent = false;
        } else {
            $oldRels = $this->srcRels;
            unset( $oldRels['.'] );
            $deleteCurrent = true;
        }
 
        return [ $oldRels, $deleteCurrent ];
    }
 
    protected function getHashes( StatusValue $status ): array {
        $hashes = [];
        [ $oldRels, $deleteCurrent ] = $this->getOldRels();
 
        if ( $deleteCurrent ) {
            $hashes['.'] = $this->file->getSha1();
        }
 
        if ( count( $oldRels ) ) {
            $dbw = $this->file->repo->getPrimaryDB();
            $res = $dbw->newSelectQueryBuilder()
                ->select( [ 'oi_archive_name', 'oi_sha1' ] )
                ->from( 'oldimage' )
                ->where( [
                    'oi_archive_name' => array_map( 'strval', array_keys( $oldRels ) ),
                    'oi_name' => $this->file->getName() // performance
                ] )
                ->caller( __METHOD__ )->fetchResultSet();
 
            foreach ( $res as $row ) {
                if ( $row->oi_archive_name === '' ) {
                    // File lost, the check simulates OldLocalFile::exists
                    $hashes[$row->oi_archive_name] = false;
                    continue;
                }
                if ( rtrim( $row->oi_sha1, "\0" ) === '' ) {
                    // Get the hash from the file
                    $oldUrl = $this->file->getArchiveVirtualUrl( $row->oi_archive_name );
                    $props = $this->file->repo->getFileProps( $oldUrl );
 
                    if ( $props['fileExists'] ) {
                        // Upgrade the oldimage row
                        $dbw->newUpdateQueryBuilder()
                            ->update( 'oldimage' )
                            ->set( [ 'oi_sha1' => $props['sha1'] ] )
                            ->where( [
                                'oi_name' => $this->file->getName(),
                                'oi_archive_name' => $row->oi_archive_name,
                            ] )
                            ->caller( __METHOD__ )->execute();
                        $hashes[$row->oi_archive_name] = $props['sha1'];
                    } else {
                        $hashes[$row->oi_archive_name] = false;
                    }
                } else {
                    $hashes[$row->oi_archive_name] = $row->oi_sha1;
                }
            }
        }
 
        $missing = array_diff_key( $this->srcRels, $hashes );
 
        foreach ( $missing as $name => $rel ) {
            $status->error( 'filedelete-old-unregistered', $name );
        }
 
        foreach ( $hashes as $name => $hash ) {
            if ( !$hash ) {
                $status->error( 'filedelete-missing', $this->srcRels[$name] );
                unset( $hashes[$name] );
            }
        }
 
        return $hashes;
    }
 
    protected function doDBInserts() {
        $now = time();
        $dbw = $this->file->repo->getPrimaryDB();
 
        $commentStore = MediaWikiServices::getInstance()->getCommentStore();
 
        $encTimestamp = $dbw->addQuotes( $dbw->timestamp( $now ) );
        $encUserId = $dbw->addQuotes( $this->user->getId() );
        $encGroup = $dbw->addQuotes( 'deleted' );
        $ext = $this->file->getExtension();
        $dotExt = $ext === '' ? '' : ".$ext";
        $encExt = $dbw->addQuotes( $dotExt );
        [ $oldRels, $deleteCurrent ] = $this->getOldRels();
 
        // Bitfields to further suppress the content
        if ( $this->suppress ) {
            $bitfield = RevisionRecord::SUPPRESSED_ALL;
        } else {
            $bitfield = 'oi_deleted';
        }
 
        if ( $deleteCurrent ) {
            $tables = [ 'image' ];
            $fields = [
                'fa_storage_group' => $encGroup,
                'fa_storage_key' => $dbw->conditional(
                    [ 'img_sha1' => '' ],
                    $dbw->addQuotes( '' ),
                    $dbw->buildConcat( [ "img_sha1", $encExt ] )
                ),
                'fa_deleted_user' => $encUserId,
                'fa_deleted_timestamp' => $encTimestamp,
                'fa_deleted' => $this->suppress ? $bitfield : 0,
                'fa_name' => 'img_name',
                'fa_archive_name' => 'NULL',
                'fa_size' => 'img_size',
                'fa_width' => 'img_width',
                'fa_height' => 'img_height',
                'fa_metadata' => 'img_metadata',
                'fa_bits' => 'img_bits',
                'fa_media_type' => 'img_media_type',
                'fa_major_mime' => 'img_major_mime',
                'fa_minor_mime' => 'img_minor_mime',
                'fa_description_id' => 'img_description_id',
                'fa_timestamp' => 'img_timestamp',
                'fa_sha1' => 'img_sha1',
                'fa_actor' => 'img_actor',
            ];
            $joins = [];
 
            $fields += array_map(
                [ $dbw, 'addQuotes' ],
                $commentStore->insert( $dbw, 'fa_deleted_reason', $this->reason )
            );
 
            $dbw->insertSelect( 'filearchive', $tables, $fields,
                [ 'img_name' => $this->file->getName() ], __METHOD__, [ 'IGNORE' ], [], $joins );
        }
 
        if ( count( $oldRels ) ) {
            $queryBuilder = FileSelectQueryBuilder::newForOldFile( $dbw );
            $queryBuilder
                ->forUpdate()
                ->where( [ 'oi_name' => $this->file->getName() ] )
                ->andWhere( [ 'oi_archive_name' => array_map( 'strval', array_keys( $oldRels ) ) ] );
            $res = $queryBuilder->caller( __METHOD__ )->fetchResultSet();
            $rowsInsert = [];
            if ( $res->numRows() ) {
                $reason = $commentStore->createComment( $dbw, $this->reason );
                foreach ( $res as $row ) {
                    $comment = $commentStore->getComment( 'oi_description', $row );
                    $rowsInsert[] = [
                        // Deletion-specific fields
                        'fa_storage_group' => 'deleted',
                        'fa_storage_key' => ( $row->oi_sha1 === '' )
                        ? ''
                        : "{$row->oi_sha1}{$dotExt}",
                        'fa_deleted_user' => $this->user->getId(),
                        'fa_deleted_timestamp' => $dbw->timestamp( $now ),
                        // Counterpart fields
                        'fa_deleted' => $this->suppress ? $bitfield : $row->oi_deleted,
                        'fa_name' => $row->oi_name,
                        'fa_archive_name' => $row->oi_archive_name,
                        'fa_size' => $row->oi_size,
                        'fa_width' => $row->oi_width,
                        'fa_height' => $row->oi_height,
                        'fa_metadata' => $row->oi_metadata,
                        'fa_bits' => $row->oi_bits,
                        'fa_media_type' => $row->oi_media_type,
                        'fa_major_mime' => $row->oi_major_mime,
                        'fa_minor_mime' => $row->oi_minor_mime,
                        'fa_actor' => $row->oi_actor,
                        'fa_timestamp' => $row->oi_timestamp,
                        'fa_sha1' => $row->oi_sha1
                    ] + $commentStore->insert( $dbw, 'fa_deleted_reason', $reason )
                    + $commentStore->insert( $dbw, 'fa_description', $comment );
                }
            }
 
            $dbw->newInsertQueryBuilder()
                ->insertInto( 'filearchive' )
                ->ignore()
                ->rows( $rowsInsert )
                ->caller( __METHOD__ )->execute();
        }
    }
 
    private function doDBDeletes() {
        $dbw = $this->file->repo->getPrimaryDB();
        [ $oldRels, $deleteCurrent ] = $this->getOldRels();
 
        if ( count( $oldRels ) ) {
            $dbw->newDeleteQueryBuilder()
                ->deleteFrom( 'oldimage' )
                ->where( [
                    'oi_name' => $this->file->getName(),
                    'oi_archive_name' => array_map( 'strval', array_keys( $oldRels ) )
                ] )
                ->caller( __METHOD__ )->execute();
        }
 
        if ( $deleteCurrent ) {
            $dbw->newDeleteQueryBuilder()
                ->deleteFrom( 'image' )
                ->where( [ 'img_name' => $this->file->getName() ] )
                ->caller( __METHOD__ )->execute();
        }
    }
 
    public function execute() {
        $repo = $this->file->getRepo();
        $lockStatus = $this->file->acquireFileLock();
        if ( !$lockStatus->isOK() ) {
            return $lockStatus;
        }
        $unlockScope = new ScopedCallback( function () {
            $this->file->releaseFileLock();
        } );
 
        $status = $this->file->repo->newGood();
        // Prepare deletion batch
        $hashes = $this->getHashes( $status );
        $this->deletionBatch = [];
        $ext = $this->file->getExtension();
        $dotExt = $ext === '' ? '' : ".$ext";
 
        foreach ( $this->srcRels as $name => $srcRel ) {
            // Skip files that have no hash (e.g. missing DB record, or sha1 field and file source)
            if ( isset( $hashes[$name] ) ) {
                $hash = $hashes[$name];
                $key = $hash . $dotExt;
                $dstRel = $repo->getDeletedHashPath( $key ) . $key;
                $this->deletionBatch[$name] = [ $srcRel, $dstRel ];
            }
        }
 
        if ( !$repo->hasSha1Storage() ) {
            // Removes non-existent file from the batch, so we don't get errors.
            // This also handles files in the 'deleted' zone deleted via revision deletion.
            $checkStatus = $this->removeNonexistentFiles( $this->deletionBatch );
            if ( !$checkStatus->isGood() ) {
                $status->merge( $checkStatus );
                return $status;
            }
            $this->deletionBatch = $checkStatus->value;
 
            // Execute the file deletion batch
            $status = $this->file->repo->deleteBatch( $this->deletionBatch );
            if ( !$status->isGood() ) {
                $status->merge( $status );
            }
        }
 
        if ( !$status->isOK() ) {
            // Critical file deletion error; abort
            return $status;
        }
 
        $dbw = $this->file->repo->getPrimaryDB();
 
        $dbw->startAtomic( __METHOD__ );
 
        // Copy the image/oldimage rows to filearchive
        $this->doDBInserts();
        // Delete image/oldimage rows
        $this->doDBDeletes();
 
        // This is typically a no-op since we are wrapped by another atomic
        // section in FileDeleteForm and also the implicit transaction.
        $dbw->endAtomic( __METHOD__ );
 
        // Commit and return
        ScopedCallback::consume( $unlockScope );
 
        return $status;
    }
 
    protected function removeNonexistentFiles( $batch ) {
        $files = [];
 
        foreach ( $batch as [ $src, /* dest */ ] ) {
            $files[$src] = $this->file->repo->getVirtualUrl( 'public' ) . '/' . rawurlencode( $src );
        }
 
        $result = $this->file->repo->fileExistsBatch( $files );
        if ( in_array( null, $result, true ) ) {
            return Status::newFatal( 'backend-fail-internal',
                $this->file->repo->getBackend()->getName() );
        }
 
        $newBatch = [];
        foreach ( $batch as $batchItem ) {
            if ( $result[$batchItem[0]] ) {
                $newBatch[] = $batchItem;
            }
        }
 
        return Status::newGood( $newBatch );
    }
}