ImportableOldRevisionImporter.php

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<?php
 
use MediaWiki\Revision\MutableRevisionRecord;
use MediaWiki\Revision\RevisionStore;
use MediaWiki\Revision\SlotRoleRegistry;
use Psr\Log\LoggerInterface;
use Wikimedia\Rdbms\ILoadBalancer;
 
class ImportableOldRevisionImporter implements OldRevisionImporter {
 
    private $logger;
 
    private $doUpdates;
 
    private $loadBalancer;
 
    private $revisionStore;
 
    private $slotRoleRegistry;
 
    public function __construct(
        $doUpdates,
        LoggerInterface $logger,
        ILoadBalancer $loadBalancer,
        RevisionStore $revisionStore,
        SlotRoleRegistry $slotRoleRegistry = null
    ) {
        $this->doUpdates = $doUpdates;
        $this->logger = $logger;
        $this->loadBalancer = $loadBalancer;
        $this->revisionStore = $revisionStore;
        // @todo: temporary - remove when FileImporter extension is updated
        if ( !$slotRoleRegistry ) {
            $slotRoleRegistry = \MediaWiki\MediaWikiServices::getInstance()->getSlotRoleRegistry();
        }
        $this->slotRoleRegistry = $slotRoleRegistry;
    }
 
    public function import( ImportableOldRevision $importableRevision, $doUpdates = true ) {
        $dbw = $this->loadBalancer->getConnectionRef( DB_MASTER );
 
        # Sneak a single revision into place
        $user = $importableRevision->getUserObj() ?: User::newFromName( $importableRevision->getUser() );
        if ( $user ) {
            $userId = intval( $user->getId() );
            $userText = $user->getName();
        } else {
            $userId = 0;
            $userText = $importableRevision->getUser();
            $user = new User;
        }
 
        // avoid memory leak...?
        Title::clearCaches();
 
        $page = WikiPage::factory( $importableRevision->getTitle() );
        $page->loadPageData( 'fromdbmaster' );
        if ( !$page->exists() ) {
            // must create the page...
            $pageId = $page->insertOn( $dbw );
            $created = true;
            $oldcountable = null;
        } else {
            $pageId = $page->getId();
            $created = false;
 
            // Note: sha1 has been in XML dumps since 2012. If you have an
            // older dump, the duplicate detection here won't work.
            if ( $importableRevision->getSha1Base36() !== false ) {
                $prior = $dbw->selectField( 'revision', '1',
                    [ 'rev_page' => $pageId,
                    'rev_timestamp' => $dbw->timestamp( $importableRevision->getTimestamp() ),
                    'rev_sha1' => $importableRevision->getSha1Base36() ],
                    __METHOD__
                );
                if ( $prior ) {
                    // @todo FIXME: This could fail slightly for multiple matches :P
                    $this->logger->debug( __METHOD__ . ": skipping existing revision for [[" .
                        $importableRevision->getTitle()->getPrefixedText() . "]], timestamp " .
                        $importableRevision->getTimestamp() . "\n" );
                    return false;
                }
            }
        }
 
        if ( !$pageId ) {
            // This seems to happen if two clients simultaneously try to import the
            // same page
            $this->logger->debug( __METHOD__ . ': got invalid $pageId when importing revision of [[' .
                $importableRevision->getTitle()->getPrefixedText() . ']], timestamp ' .
                $importableRevision->getTimestamp() . "\n" );
            return false;
        }
 
        // Select previous version to make size diffs correct
        // @todo This assumes that multiple revisions of the same page are imported
        // in order from oldest to newest.
        $qi = $this->revisionStore->getQueryInfo();
        $prevRevRow = $dbw->selectRow( $qi['tables'], $qi['fields'],
            [
                'rev_page' => $pageId,
                'rev_timestamp <= ' . $dbw->addQuotes( $dbw->timestamp( $importableRevision->getTimestamp() ) ),
            ],
            __METHOD__,
            [ 'ORDER BY' => [
                'rev_timestamp DESC',
                'rev_id DESC', // timestamp is not unique per page
            ]
            ],
            $qi['joins']
        );
 
        # @todo FIXME: Use original rev_id optionally (better for backups)
        # Insert the row
        $revisionRecord = new MutableRevisionRecord( $importableRevision->getTitle() );
        $revisionRecord->setParentId( $prevRevRow ? (int)$prevRevRow->rev_id : 0 );
        $revisionRecord->setComment(
            CommentStoreComment::newUnsavedComment( $importableRevision->getComment() )
        );
 
        try {
            $revUser = User::newFromAnyId(
                $userId,
                $userText,
                null
            );
        } catch ( InvalidArgumentException $ex ) {
            $revUser = RequestContext::getMain()->getUser();
        }
        $revisionRecord->setUser( $revUser );
 
        $originalRevision = $prevRevRow
            ? $this->revisionStore->newRevisionFromRow(
                $prevRevRow,
                IDBAccessObject::READ_LATEST,
                $importableRevision->getTitle()
            )
            : null;
 
        foreach ( $importableRevision->getSlotRoles() as $role ) {
            if ( !$this->slotRoleRegistry->isDefinedRole( $role ) ) {
                throw new MWException( "Undefined slot role $role" );
            }
 
            $newContent = $importableRevision->getContent( $role );
            if ( !$originalRevision || !$originalRevision->hasSlot( $role ) ) {
                $revisionRecord->setContent( $role, $newContent );
            } else {
                $originalSlot = $originalRevision->getSlot( $role );
                if ( !$originalSlot->hasSameContent( $importableRevision->getSlot( $role ) ) ) {
                    $revisionRecord->setContent( $role, $newContent );
                } else {
                    $revisionRecord->inheritSlot( $originalRevision->getSlot( $role ) );
                }
            }
        }
 
        $revisionRecord->setTimestamp( $importableRevision->getTimestamp() );
        $revisionRecord->setMinorEdit( $importableRevision->getMinor() );
        $revisionRecord->setPageId( $pageId );
 
        $latestRevId = $page->getLatest();
 
        $inserted = $this->revisionStore->insertRevisionOn( $revisionRecord, $dbw );
        if ( $latestRevId ) {
            // If not found (false), cast to 0 so that the page is updated
            // Just to be on the safe side, even though it should always be found
            $latestRevTimestamp = (int)$this->revisionStore->getTimestampFromId(
                $latestRevId,
                RevisionStore::READ_LATEST
            );
        } else {
            $latestRevTimestamp = 0;
        }
        if ( $importableRevision->getTimestamp() > $latestRevTimestamp ) {
            $changed = $page->updateRevisionOn( $dbw, $inserted, $latestRevId );
        } else {
            $changed = false;
        }
 
        $tags = $importableRevision->getTags();
        if ( $tags !== [] ) {
            ChangeTags::addTags( $tags, null, $inserted->getId() );
        }
 
        if ( $changed !== false && $this->doUpdates ) {
            $this->logger->debug( __METHOD__ . ": running updates" );
            // countable/oldcountable stuff is handled in WikiImporter::finishImportPage
            // @todo replace deprecated function
            $page->doEditUpdates(
                $inserted,
                $user,
                [ 'created' => $created, 'oldcountable' => 'no-change' ]
            );
        }
 
        return true;
    }
 
}