PageConfigFactory.php

Go to the documentation of this file.

<?php
namespace MediaWiki\Parser\Parsoid\Config;
 
use IDBAccessObject;
use MediaWiki\Languages\LanguageFactory;
use MediaWiki\Logger\LoggerFactory;
use MediaWiki\Page\PageIdentity;
use MediaWiki\Revision\RevisionAccessException;
use MediaWiki\Revision\RevisionRecord;
use MediaWiki\Revision\RevisionStore;
use MediaWiki\Revision\SlotRecord;
use MediaWiki\Revision\SlotRoleRegistry;
use MediaWiki\Revision\SuppressedDataException;
use MediaWiki\Title\Title;
use MediaWiki\User\UserIdentity;
use ParserOptions;
use Wikimedia\Bcp47Code\Bcp47Code;
 
class PageConfigFactory extends \Wikimedia\Parsoid\Config\PageConfigFactory {
    private RevisionStore $revisionStore;
    private SlotRoleRegistry $slotRoleRegistry;
    private LanguageFactory $languageFactory;
 
    public function __construct(
        RevisionStore $revisionStore,
        SlotRoleRegistry $slotRoleRegistry,
        LanguageFactory $languageFactory
    ) {
        $this->revisionStore = $revisionStore;
        $this->slotRoleRegistry = $slotRoleRegistry;
        $this->languageFactory = $languageFactory;
    }
 
    public function create(
        PageIdentity $pageId,
        ?UserIdentity $user = null,
        $revision = null,
        ?string $unused = null, /* Added to mollify CI with cross-repo uses */
        ?Bcp47Code $pageLanguageOverride = null,
        bool $ensureAccessibleContent = false
    ): \Wikimedia\Parsoid\Config\PageConfig {
        $title = Title::newFromPageIdentity( $pageId );
 
        if ( $unused !== null ) {
            wfDeprecated( __METHOD__ . ' with non-null 4th arg', '1.40' );
        }
 
        if ( $revision === null ) {
            // Fetch the 'latest' revision for the given title.
            // Note: This initial fetch of the page context revision is
            // *not* using Parser::fetchCurrentRevisionRecordOfTitle()
            // (which usually invokes Parser::statelessFetchRevisionRecord
            // and from there RevisionStore::getKnownCurrentRevision)
            // because we don't have a Parser object to give to that callback.
            // We could create one if needed for greater compatibility.
            $revisionRecord = $this->revisionStore->getKnownCurrentRevision(
                $title
            ) ?: null;
            // Note that $revisionRecord could still be null here if no
            // page with that $title yet exists.
        } elseif ( !is_int( $revision ) ) {
            $revisionRecord = $revision;
        } else {
            if ( $revision === 0 ) {
                // The client may explicitly provide 0 as the revision ID to indicate that
                // the content doesn't belong to any saved revision, and provide wikitext
                // in some way. Calling code should handle this case and provide a (fake)
                // RevisionRecord based on the data in the request. If we get here, the
                // code processing the request didn't handle this case properly.
                throw new \UnexpectedValueException(
                    "Got revision ID 0 indicating unsaved content. " .
                    "Unsaved content must be provided as a RevisionRecord object."
                );
            }
 
            // Fetch the correct revision record by the supplied id.
            // This accesses the replica DB and may (or may not) fail over to
            // the primary DB if the revision isn't found.
            $revisionRecord = $this->revisionStore->getRevisionById( $revision );
            if ( $revisionRecord === null ) {
                // This revision really ought to exist.  Check the primary DB.
                // This *could* cause two requests to the primary DB if there
                // were pending writes, but this codepath should be very rare.
                // [T259855]
                $revisionRecord = $this->revisionStore->getRevisionById(
                    $revision, IDBAccessObject::READ_LATEST
                );
                $success = ( $revisionRecord !== null ) ? 'success' : 'failure';
                LoggerFactory::getInstance( 'Parsoid' )->error(
                    "Retried revision fetch after failure: {$success}", [
                        'id' => $revision,
                        'title' => $title->getPrefixedText(),
                    ]
                );
            }
            if ( $revisionRecord === null ) {
                throw new RevisionAccessException( "Can't find revision {$revision}" );
            }
        }
 
        // If we have a revision record, check that we are allowed to see it.
        // Mirrors the check from RevisionRecord::getContent
        if (
            $revisionRecord !== null &&
            !$revisionRecord->audienceCan(
                RevisionRecord::DELETED_TEXT, RevisionRecord::FOR_PUBLIC
            )
        ) {
            throw new SuppressedDataException( 'Not an available content version.' );
        }
 
        $parserOptions =
            $user
            ? ParserOptions::newFromUser( $user )
            : ParserOptions::newFromAnon();
 
        // Turn off some options since Parsoid/JS currently doesn't
        // do anything with this. As we proceed with closer integration,
        // we can figure out if there is any value to these limit reports.
        $parserOptions->setOption( 'enableLimitReport', false );
 
        $slotRoleHandler = $this->slotRoleRegistry->getRoleHandler( SlotRecord::MAIN );
        if ( $pageLanguageOverride ) {
            $pageLanguage = $this->languageFactory->getLanguage( $pageLanguageOverride );
        } else {
            $pageLanguage = $title->getPageLanguage();
        }
 
        $pageConfig = new PageConfig(
            $parserOptions,
            $slotRoleHandler,
            $title,
            $revisionRecord,
            $pageLanguage,
            $pageLanguage->getDir()
        );
 
        if ( $ensureAccessibleContent ) {
            if ( $revisionRecord === null ) {
                // T234549
                throw new RevisionAccessException( 'The specified revision does not exist.' );
            }
            // Try to get the content so that we can fail early.  Otherwise,
            // a RevisionAccessException is thrown.  It's expensive, but the
            // result will be cached for later calls.
            $pageConfig->getRevisionContent()->getContent( SlotRecord::MAIN );
        }
 
        return $pageConfig;
    }
 
}