WikiPage.php

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<?php
class WikiPage implements Page, IDBAccessObject {
    // Constants for $mDataLoadedFrom and related

    public $mTitle = null;

    public $mDataLoaded = false;         // !< Boolean
    public $mIsRedirect = false;         // !< Boolean
    public $mLatest = false;             // !< Integer (false means "not loaded")
    public $mPreparedEdit = false;

    protected $mId = null;

    protected $mDataLoadedFrom = self::READ_NONE;

    protected $mRedirectTarget = null;

    protected $mLastRevision = null;

    protected $mTimestamp = '';

    protected $mTouched = '19700101000000';

    protected $mLinksUpdated = '19700101000000';

    public function __construct( Title $title ) {
        $this->mTitle = $title;
    }

    public static function factory( Title $title ) {
        $ns = $title->getNamespace();

        if ( $ns == NS_MEDIA ) {
            throw new MWException( "NS_MEDIA is a virtual namespace; use NS_FILE." );
        } elseif ( $ns < 0 ) {
            throw new MWException( "Invalid or virtual namespace $ns given." );
        }

        switch ( $ns ) {
            case NS_FILE:
                $page = new WikiFilePage( $title );
                break;
            case NS_CATEGORY:
                $page = new WikiCategoryPage( $title );
                break;
            default:
                $page = new WikiPage( $title );
        }

        return $page;
    }

    public static function newFromID( $id, $from = 'fromdb' ) {
        // page id's are never 0 or negative, see bug 61166
        if ( $id < 1 ) {
            return null;
        }

        $from = self::convertSelectType( $from );
        $db = wfGetDB( $from === self::READ_LATEST ? DB_MASTER : DB_SLAVE );
        $row = $db->selectRow(
            'page', self::selectFields(), [ 'page_id' => $id ], __METHOD__ );
        if ( !$row ) {
            return null;
        }
        return self::newFromRow( $row, $from );
    }

    public static function newFromRow( $row, $from = 'fromdb' ) {
        $page = self::factory( Title::newFromRow( $row ) );
        $page->loadFromRow( $row, $from );
        return $page;
    }

    private static function convertSelectType( $type ) {
        switch ( $type ) {
        case 'fromdb':
            return self::READ_NORMAL;
        case 'fromdbmaster':
            return self::READ_LATEST;
        case 'forupdate':
            return self::READ_LOCKING;
        default:
            // It may already be an integer or whatever else
            return $type;
        }
    }

    public function getActionOverrides() {
        $content_handler = $this->getContentHandler();
        return $content_handler->getActionOverrides();
    }

    public function getContentHandler() {
        return ContentHandler::getForModelID( $this->getContentModel() );
    }

    public function getTitle() {
        return $this->mTitle;
    }

    public function clear() {
        $this->mDataLoaded = false;
        $this->mDataLoadedFrom = self::READ_NONE;

        $this->clearCacheFields();
    }

    protected function clearCacheFields() {
        $this->mId = null;
        $this->mRedirectTarget = null; // Title object if set
        $this->mLastRevision = null; // Latest revision
        $this->mTouched = '19700101000000';
        $this->mLinksUpdated = '19700101000000';
        $this->mTimestamp = '';
        $this->mIsRedirect = false;
        $this->mLatest = false;
        // Bug 57026: do not clear mPreparedEdit since prepareTextForEdit() already checks
        // the requested rev ID and content against the cached one for equality. For most
        // content types, the output should not change during the lifetime of this cache.
        // Clearing it can cause extra parses on edit for no reason.
    }

    public function clearPreparedEdit() {
        $this->mPreparedEdit = false;
    }

    public static function selectFields() {
        global $wgContentHandlerUseDB, $wgPageLanguageUseDB;

        $fields = [
            'page_id',
            'page_namespace',
            'page_title',
            'page_restrictions',
            'page_is_redirect',
            'page_is_new',
            'page_random',
            'page_touched',
            'page_links_updated',
            'page_latest',
            'page_len',
        ];

        if ( $wgContentHandlerUseDB ) {
            $fields[] = 'page_content_model';
        }

        if ( $wgPageLanguageUseDB ) {
            $fields[] = 'page_lang';
        }

        return $fields;
    }

    protected function pageData( $dbr, $conditions, $options = [] ) {
        $fields = self::selectFields();

        Hooks::run( 'ArticlePageDataBefore', [ &$this, &$fields ] );

        $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__, $options );

        Hooks::run( 'ArticlePageDataAfter', [ &$this, &$row ] );

        return $row;
    }

    public function pageDataFromTitle( $dbr, $title, $options = [] ) {
        return $this->pageData( $dbr, [
            'page_namespace' => $title->getNamespace(),
            'page_title' => $title->getDBkey() ], $options );
    }

    public function pageDataFromId( $dbr, $id, $options = [] ) {
        return $this->pageData( $dbr, [ 'page_id' => $id ], $options );
    }

    public function loadPageData( $from = 'fromdb' ) {
        $from = self::convertSelectType( $from );
        if ( is_int( $from ) && $from <= $this->mDataLoadedFrom ) {
            // We already have the data from the correct location, no need to load it twice.
            return;
        }

        if ( is_int( $from ) ) {
            list( $index, $opts ) = DBAccessObjectUtils::getDBOptions( $from );
            $data = $this->pageDataFromTitle( wfGetDB( $index ), $this->mTitle, $opts );

            if ( !$data
                && $index == DB_SLAVE
                && wfGetLB()->getServerCount() > 1
                && wfGetLB()->hasOrMadeRecentMasterChanges()
            ) {
                $from = self::READ_LATEST;
                list( $index, $opts ) = DBAccessObjectUtils::getDBOptions( $from );
                $data = $this->pageDataFromTitle( wfGetDB( $index ), $this->mTitle, $opts );
            }
        } else {
            // No idea from where the caller got this data, assume slave database.
            $data = $from;
            $from = self::READ_NORMAL;
        }

        $this->loadFromRow( $data, $from );
    }

    public function loadFromRow( $data, $from ) {
        $lc = LinkCache::singleton();
        $lc->clearLink( $this->mTitle );

        if ( $data ) {
            $lc->addGoodLinkObjFromRow( $this->mTitle, $data );

            $this->mTitle->loadFromRow( $data );

            // Old-fashioned restrictions
            $this->mTitle->loadRestrictions( $data->page_restrictions );

            $this->mId = intval( $data->page_id );
            $this->mTouched = wfTimestamp( TS_MW, $data->page_touched );
            $this->mLinksUpdated = wfTimestampOrNull( TS_MW, $data->page_links_updated );
            $this->mIsRedirect = intval( $data->page_is_redirect );
            $this->mLatest = intval( $data->page_latest );
            // Bug 37225: $latest may no longer match the cached latest Revision object.
            // Double-check the ID of any cached latest Revision object for consistency.
            if ( $this->mLastRevision && $this->mLastRevision->getId() != $this->mLatest ) {
                $this->mLastRevision = null;
                $this->mTimestamp = '';
            }
        } else {
            $lc->addBadLinkObj( $this->mTitle );

            $this->mTitle->loadFromRow( false );

            $this->clearCacheFields();

            $this->mId = 0;
        }

        $this->mDataLoaded = true;
        $this->mDataLoadedFrom = self::convertSelectType( $from );
    }

    public function getId() {
        if ( !$this->mDataLoaded ) {
            $this->loadPageData();
        }
        return $this->mId;
    }

    public function exists() {
        if ( !$this->mDataLoaded ) {
            $this->loadPageData();
        }
        return $this->mId > 0;
    }

    public function hasViewableContent() {
        return $this->exists() || $this->mTitle->isAlwaysKnown();
    }

    public function isRedirect() {
        if ( !$this->mDataLoaded ) {
            $this->loadPageData();
        }

        return (bool)$this->mIsRedirect;
    }

    public function getContentModel() {
        if ( $this->exists() ) {
            // look at the revision's actual content model
            $rev = $this->getRevision();

            if ( $rev !== null ) {
                return $rev->getContentModel();
            } else {
                $title = $this->mTitle->getPrefixedDBkey();
                wfWarn( "Page $title exists but has no (visible) revisions!" );
            }
        }

        // use the default model for this page
        return $this->mTitle->getContentModel();
    }

    public function checkTouched() {
        if ( !$this->mDataLoaded ) {
            $this->loadPageData();
        }
        return !$this->mIsRedirect;
    }

    public function getTouched() {
        if ( !$this->mDataLoaded ) {
            $this->loadPageData();
        }
        return $this->mTouched;
    }

    public function getLinksTimestamp() {
        if ( !$this->mDataLoaded ) {
            $this->loadPageData();
        }
        return $this->mLinksUpdated;
    }

    public function getLatest() {
        if ( !$this->mDataLoaded ) {
            $this->loadPageData();
        }
        return (int)$this->mLatest;
    }

    public function getOldestRevision() {

        // Try using the slave database first, then try the master
        $continue = 2;
        $db = wfGetDB( DB_SLAVE );
        $revSelectFields = Revision::selectFields();

        $row = null;
        while ( $continue ) {
            $row = $db->selectRow(
                [ 'page', 'revision' ],
                $revSelectFields,
                [
                    'page_namespace' => $this->mTitle->getNamespace(),
                    'page_title' => $this->mTitle->getDBkey(),
                    'rev_page = page_id'
                ],
                __METHOD__,
                [
                    'ORDER BY' => 'rev_timestamp ASC'
                ]
            );

            if ( $row ) {
                $continue = 0;
            } else {
                $db = wfGetDB( DB_MASTER );
                $continue--;
            }
        }

        return $row ? Revision::newFromRow( $row ) : null;
    }

    protected function loadLastEdit() {
        if ( $this->mLastRevision !== null ) {
            return; // already loaded
        }

        $latest = $this->getLatest();
        if ( !$latest ) {
            return; // page doesn't exist or is missing page_latest info
        }

        if ( $this->mDataLoadedFrom == self::READ_LOCKING ) {
            // Bug 37225: if session S1 loads the page row FOR UPDATE, the result always
            // includes the latest changes committed. This is true even within REPEATABLE-READ
            // transactions, where S1 normally only sees changes committed before the first S1
            // SELECT. Thus we need S1 to also gets the revision row FOR UPDATE; otherwise, it
            // may not find it since a page row UPDATE and revision row INSERT by S2 may have
            // happened after the first S1 SELECT.
            // http://dev.mysql.com/doc/refman/5.0/en/set-transaction.html#isolevel_repeatable-read
            $flags = Revision::READ_LOCKING;
        } elseif ( $this->mDataLoadedFrom == self::READ_LATEST ) {
            // Bug T93976: if page_latest was loaded from the master, fetch the
            // revision from there as well, as it may not exist yet on a slave DB.
            // Also, this keeps the queries in the same REPEATABLE-READ snapshot.
            $flags = Revision::READ_LATEST;
        } else {
            $flags = 0;
        }
        $revision = Revision::newFromPageId( $this->getId(), $latest, $flags );
        if ( $revision ) { // sanity
            $this->setLastEdit( $revision );
        }
    }

    protected function setLastEdit( Revision $revision ) {
        $this->mLastRevision = $revision;
        $this->mTimestamp = $revision->getTimestamp();
    }

    public function getRevision() {
        $this->loadLastEdit();
        if ( $this->mLastRevision ) {
            return $this->mLastRevision;
        }
        return null;
    }

    public function getContent( $audience = Revision::FOR_PUBLIC, User $user = null ) {
        $this->loadLastEdit();
        if ( $this->mLastRevision ) {
            return $this->mLastRevision->getContent( $audience, $user );
        }
        return null;
    }

    public function getText( $audience = Revision::FOR_PUBLIC, User $user = null ) {
        ContentHandler::deprecated( __METHOD__, '1.21' );

        $this->loadLastEdit();
        if ( $this->mLastRevision ) {
            return $this->mLastRevision->getText( $audience, $user );
        }
        return false;
    }

    public function getTimestamp() {
        // Check if the field has been filled by WikiPage::setTimestamp()
        if ( !$this->mTimestamp ) {
            $this->loadLastEdit();
        }

        return wfTimestamp( TS_MW, $this->mTimestamp );
    }

    public function setTimestamp( $ts ) {
        $this->mTimestamp = wfTimestamp( TS_MW, $ts );
    }

    public function getUser( $audience = Revision::FOR_PUBLIC, User $user = null ) {
        $this->loadLastEdit();
        if ( $this->mLastRevision ) {
            return $this->mLastRevision->getUser( $audience, $user );
        } else {
            return -1;
        }
    }

    public function getCreator( $audience = Revision::FOR_PUBLIC, User $user = null ) {
        $revision = $this->getOldestRevision();
        if ( $revision ) {
            $userName = $revision->getUserText( $audience, $user );
            return User::newFromName( $userName, false );
        } else {
            return null;
        }
    }

    public function getUserText( $audience = Revision::FOR_PUBLIC, User $user = null ) {
        $this->loadLastEdit();
        if ( $this->mLastRevision ) {
            return $this->mLastRevision->getUserText( $audience, $user );
        } else {
            return '';
        }
    }

    public function getComment( $audience = Revision::FOR_PUBLIC, User $user = null ) {
        $this->loadLastEdit();
        if ( $this->mLastRevision ) {
            return $this->mLastRevision->getComment( $audience, $user );
        } else {
            return '';
        }
    }

    public function getMinorEdit() {
        $this->loadLastEdit();
        if ( $this->mLastRevision ) {
            return $this->mLastRevision->isMinor();
        } else {
            return false;
        }
    }

    public function isCountable( $editInfo = false ) {
        global $wgArticleCountMethod;

        if ( !$this->mTitle->isContentPage() ) {
            return false;
        }

        if ( $editInfo ) {
            $content = $editInfo->pstContent;
        } else {
            $content = $this->getContent();
        }

        if ( !$content || $content->isRedirect() ) {
            return false;
        }

        $hasLinks = null;

        if ( $wgArticleCountMethod === 'link' ) {
            // nasty special case to avoid re-parsing to detect links

            if ( $editInfo ) {
                // ParserOutput::getLinks() is a 2D array of page links, so
                // to be really correct we would need to recurse in the array
                // but the main array should only have items in it if there are
                // links.
                $hasLinks = (bool)count( $editInfo->output->getLinks() );
            } else {
                $hasLinks = (bool)wfGetDB( DB_SLAVE )->selectField( 'pagelinks', 1,
                    [ 'pl_from' => $this->getId() ], __METHOD__ );
            }
        }

        return $content->isCountable( $hasLinks );
    }

    public function getRedirectTarget() {
        if ( !$this->mTitle->isRedirect() ) {
            return null;
        }

        if ( $this->mRedirectTarget !== null ) {
            return $this->mRedirectTarget;
        }

        // Query the redirect table
        $dbr = wfGetDB( DB_SLAVE );
        $row = $dbr->selectRow( 'redirect',
            [ 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ],
            [ 'rd_from' => $this->getId() ],
            __METHOD__
        );

        // rd_fragment and rd_interwiki were added later, populate them if empty
        if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
            $this->mRedirectTarget = Title::makeTitle(
                $row->rd_namespace, $row->rd_title,
                $row->rd_fragment, $row->rd_interwiki
            );
            return $this->mRedirectTarget;
        }

        // This page doesn't have an entry in the redirect table
        $this->mRedirectTarget = $this->insertRedirect();
        return $this->mRedirectTarget;
    }

    public function insertRedirect() {
        $content = $this->getContent();
        $retval = $content ? $content->getUltimateRedirectTarget() : null;
        if ( !$retval ) {
            return null;
        }

        // Update the DB post-send if the page has not cached since now
        $that = $this;
        $latest = $this->getLatest();
        DeferredUpdates::addCallableUpdate( function() use ( $that, $retval, $latest ) {
            $that->insertRedirectEntry( $retval, $latest );
        } );

        return $retval;
    }

    public function insertRedirectEntry( Title $rt, $oldLatest = null ) {
        $dbw = wfGetDB( DB_MASTER );
        $dbw->startAtomic( __METHOD__ );

        if ( !$oldLatest || $oldLatest == $this->lockAndGetLatest() ) {
            $dbw->replace( 'redirect',
                [ 'rd_from' ],
                [
                    'rd_from' => $this->getId(),
                    'rd_namespace' => $rt->getNamespace(),
                    'rd_title' => $rt->getDBkey(),
                    'rd_fragment' => $rt->getFragment(),
                    'rd_interwiki' => $rt->getInterwiki(),
                ],
                __METHOD__
            );
        }

        $dbw->endAtomic( __METHOD__ );
    }

    public function followRedirect() {
        return $this->getRedirectURL( $this->getRedirectTarget() );
    }

    public function getRedirectURL( $rt ) {
        if ( !$rt ) {
            return false;
        }

        if ( $rt->isExternal() ) {
            if ( $rt->isLocal() ) {
                // Offsite wikis need an HTTP redirect.
                // This can be hard to reverse and may produce loops,
                // so they may be disabled in the site configuration.
                $source = $this->mTitle->getFullURL( 'redirect=no' );
                return $rt->getFullURL( [ 'rdfrom' => $source ] );
            } else {
                // External pages without "local" bit set are not valid
                // redirect targets
                return false;
            }
        }

        if ( $rt->isSpecialPage() ) {
            // Gotta handle redirects to special pages differently:
            // Fill the HTTP response "Location" header and ignore the rest of the page we're on.
            // Some pages are not valid targets.
            if ( $rt->isValidRedirectTarget() ) {
                return $rt->getFullURL();
            } else {
                return false;
            }
        }

        return $rt;
    }

    public function getContributors() {
        // @todo FIXME: This is expensive; cache this info somewhere.

        $dbr = wfGetDB( DB_SLAVE );

        if ( $dbr->implicitGroupby() ) {
            $realNameField = 'user_real_name';
        } else {
            $realNameField = 'MIN(user_real_name) AS user_real_name';
        }

        $tables = [ 'revision', 'user' ];

        $fields = [
            'user_id' => 'rev_user',
            'user_name' => 'rev_user_text',
            $realNameField,
            'timestamp' => 'MAX(rev_timestamp)',
        ];

        $conds = [ 'rev_page' => $this->getId() ];

        // The user who made the top revision gets credited as "this page was last edited by
        // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
        $user = $this->getUser();
        if ( $user ) {
            $conds[] = "rev_user != $user";
        } else {
            $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
        }

        // Username hidden?
        $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0";

        $jconds = [
            'user' => [ 'LEFT JOIN', 'rev_user = user_id' ],
        ];

        $options = [
            'GROUP BY' => [ 'rev_user', 'rev_user_text' ],
            'ORDER BY' => 'timestamp DESC',
        ];

        $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
        return new UserArrayFromResult( $res );
    }

    public function shouldCheckParserCache( ParserOptions $parserOptions, $oldId ) {
        return $parserOptions->getStubThreshold() == 0
            && $this->exists()
            && ( $oldId === null || $oldId === 0 || $oldId === $this->getLatest() )
            && $this->getContentHandler()->isParserCacheSupported();
    }

    public function getParserOutput( ParserOptions $parserOptions, $oldid = null ) {

        $useParserCache = $this->shouldCheckParserCache( $parserOptions, $oldid );
        wfDebug( __METHOD__ .
            ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
        if ( $parserOptions->getStubThreshold() ) {
            wfIncrStats( 'pcache.miss.stub' );
        }

        if ( $useParserCache ) {
            $parserOutput = ParserCache::singleton()->get( $this, $parserOptions );
            if ( $parserOutput !== false ) {
                return $parserOutput;
            }
        }

        if ( $oldid === null || $oldid === 0 ) {
            $oldid = $this->getLatest();
        }

        $pool = new PoolWorkArticleView( $this, $parserOptions, $oldid, $useParserCache );
        $pool->execute();

        return $pool->getParserOutput();
    }

    public function doViewUpdates( User $user, $oldid = 0 ) {
        if ( wfReadOnly() ) {
            return;
        }

        Hooks::run( 'PageViewUpdates', [ $this, $user ] );
        // Update newtalk / watchlist notification status
        try {
            $user->clearNotification( $this->mTitle, $oldid );
        } catch ( DBError $e ) {
            // Avoid outage if the master is not reachable
            MWExceptionHandler::logException( $e );
        }
    }

    public function doPurge() {
        if ( !Hooks::run( 'ArticlePurge', [ &$this ] ) ) {
            return false;
        }

        $title = $this->mTitle;
        wfGetDB( DB_MASTER )->onTransactionIdle( function() use ( $title ) {
            // Invalidate the cache in auto-commit mode
            $title->invalidateCache();
        } );

        // Send purge after above page_touched update was committed
        DeferredUpdates::addUpdate(
            new CdnCacheUpdate( $title->getCdnUrls() ),
            DeferredUpdates::PRESEND
        );

        if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
            // @todo move this logic to MessageCache
            if ( $this->exists() ) {
                // NOTE: use transclusion text for messages.
                //       This is consistent with  MessageCache::getMsgFromNamespace()

                $content = $this->getContent();
                $text = $content === null ? null : $content->getWikitextForTransclusion();

                if ( $text === null ) {
                    $text = false;
                }
            } else {
                $text = false;
            }

            MessageCache::singleton()->replace( $this->mTitle->getDBkey(), $text );
        }

        return true;
    }

    public function insertOn( $dbw, $pageId = null ) {
        $pageIdForInsert = $pageId ?: $dbw->nextSequenceValue( 'page_page_id_seq' );
        $dbw->insert(
            'page',
            [
                'page_id'           => $pageIdForInsert,
                'page_namespace'    => $this->mTitle->getNamespace(),
                'page_title'        => $this->mTitle->getDBkey(),
                'page_restrictions' => '',
                'page_is_redirect'  => 0, // Will set this shortly...
                'page_is_new'       => 1,
                'page_random'       => wfRandom(),
                'page_touched'      => $dbw->timestamp(),
                'page_latest'       => 0, // Fill this in shortly...
                'page_len'          => 0, // Fill this in shortly...
            ],
            __METHOD__,
            'IGNORE'
        );

        if ( $dbw->affectedRows() > 0 ) {
            $newid = $pageId ?: $dbw->insertId();
            $this->mId = $newid;
            $this->mTitle->resetArticleID( $newid );

            return $newid;
        } else {
            return false; // nothing changed
        }
    }

    public function updateRevisionOn( $dbw, $revision, $lastRevision = null,
        $lastRevIsRedirect = null
    ) {
        global $wgContentHandlerUseDB;

        // Assertion to try to catch T92046
        if ( (int)$revision->getId() === 0 ) {
            throw new InvalidArgumentException(
                __METHOD__ . ': Revision has ID ' . var_export( $revision->getId(), 1 )
            );
        }

        $content = $revision->getContent();
        $len = $content ? $content->getSize() : 0;
        $rt = $content ? $content->getUltimateRedirectTarget() : null;

        $conditions = [ 'page_id' => $this->getId() ];

        if ( !is_null( $lastRevision ) ) {
            // An extra check against threads stepping on each other
            $conditions['page_latest'] = $lastRevision;
        }

        $row = [ /* SET */
            'page_latest'      => $revision->getId(),
            'page_touched'     => $dbw->timestamp( $revision->getTimestamp() ),
            'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
            'page_is_redirect' => $rt !== null ? 1 : 0,
            'page_len'         => $len,
        ];

        if ( $wgContentHandlerUseDB ) {
            $row['page_content_model'] = $revision->getContentModel();
        }

        $dbw->update( 'page',
            $row,
            $conditions,
            __METHOD__ );

        $result = $dbw->affectedRows() > 0;
        if ( $result ) {
            $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
            $this->setLastEdit( $revision );
            $this->mLatest = $revision->getId();
            $this->mIsRedirect = (bool)$rt;
            // Update the LinkCache.
            LinkCache::singleton()->addGoodLinkObj(
                $this->getId(),
                $this->mTitle,
                $len,
                $this->mIsRedirect,
                $this->mLatest,
                $revision->getContentModel()
            );
        }

        return $result;
    }

    public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
        // Always update redirects (target link might have changed)
        // Update/Insert if we don't know if the last revision was a redirect or not
        // Delete if changing from redirect to non-redirect
        $isRedirect = !is_null( $redirectTitle );

        if ( !$isRedirect && $lastRevIsRedirect === false ) {
            return true;
        }

        if ( $isRedirect ) {
            $this->insertRedirectEntry( $redirectTitle );
        } else {
            // This is not a redirect, remove row from redirect table
            $where = [ 'rd_from' => $this->getId() ];
            $dbw->delete( 'redirect', $where, __METHOD__ );
        }

        if ( $this->getTitle()->getNamespace() == NS_FILE ) {
            RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
        }

        return ( $dbw->affectedRows() != 0 );
    }

    public function updateIfNewerOn( $dbw, $revision ) {

        $row = $dbw->selectRow(
            [ 'revision', 'page' ],
            [ 'rev_id', 'rev_timestamp', 'page_is_redirect' ],
            [
                'page_id' => $this->getId(),
                'page_latest=rev_id' ],
            __METHOD__ );

        if ( $row ) {
            if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
                return false;
            }
            $prev = $row->rev_id;
            $lastRevIsRedirect = (bool)$row->page_is_redirect;
        } else {
            // No or missing previous revision; mark the page as new
            $prev = 0;
            $lastRevIsRedirect = null;
        }

        $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );

        return $ret;
    }

    public function getUndoContent( Revision $undo, Revision $undoafter = null ) {
        $handler = $undo->getContentHandler();
        return $handler->getUndoContent( $this->getRevision(), $undo, $undoafter );
    }

    public function supportsSections() {
        return $this->getContentHandler()->supportsSections();
    }

    public function replaceSectionContent(
        $sectionId, Content $sectionContent, $sectionTitle = '', $edittime = null
    ) {

        $baseRevId = null;
        if ( $edittime && $sectionId !== 'new' ) {
            $dbr = wfGetDB( DB_SLAVE );
            $rev = Revision::loadFromTimestamp( $dbr, $this->mTitle, $edittime );
            // Try the master if this thread may have just added it.
            // This could be abstracted into a Revision method, but we don't want
            // to encourage loading of revisions by timestamp.
            if ( !$rev
                && wfGetLB()->getServerCount() > 1
                && wfGetLB()->hasOrMadeRecentMasterChanges()
            ) {
                $dbw = wfGetDB( DB_MASTER );
                $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
            }
            if ( $rev ) {
                $baseRevId = $rev->getId();
            }
        }

        return $this->replaceSectionAtRev( $sectionId, $sectionContent, $sectionTitle, $baseRevId );
    }

    public function replaceSectionAtRev( $sectionId, Content $sectionContent,
        $sectionTitle = '', $baseRevId = null
    ) {

        if ( strval( $sectionId ) === '' ) {
            // Whole-page edit; let the whole text through
            $newContent = $sectionContent;
        } else {
            if ( !$this->supportsSections() ) {
                throw new MWException( "sections not supported for content model " .
                    $this->getContentHandler()->getModelID() );
            }

            // Bug 30711: always use current version when adding a new section
            if ( is_null( $baseRevId ) || $sectionId === 'new' ) {
                $oldContent = $this->getContent();
            } else {
                $rev = Revision::newFromId( $baseRevId );
                if ( !$rev ) {
                    wfDebug( __METHOD__ . " asked for bogus section (page: " .
                        $this->getId() . "; section: $sectionId)\n" );
                    return null;
                }

                $oldContent = $rev->getContent();
            }

            if ( !$oldContent ) {
                wfDebug( __METHOD__ . ": no page text\n" );
                return null;
            }

            $newContent = $oldContent->replaceSection( $sectionId, $sectionContent, $sectionTitle );
        }

        return $newContent;
    }

    public function checkFlags( $flags ) {
        if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
            if ( $this->exists() ) {
                $flags |= EDIT_UPDATE;
            } else {
                $flags |= EDIT_NEW;
            }
        }

        return $flags;
    }

    public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
        ContentHandler::deprecated( __METHOD__, '1.21' );

        $content = ContentHandler::makeContent( $text, $this->getTitle() );

        return $this->doEditContent( $content, $summary, $flags, $baseRevId, $user );
    }

    public function doEditContent(
        Content $content, $summary, $flags = 0, $baseRevId = false,
        User $user = null, $serialFormat = null, $tags = null
    ) {
        global $wgUser, $wgUseAutomaticEditSummaries;

        // Low-level sanity check
        if ( $this->mTitle->getText() === '' ) {
            throw new MWException( 'Something is trying to edit an article with an empty title' );
        }
        // Make sure the given content type is allowed for this page
        if ( !$content->getContentHandler()->canBeUsedOn( $this->mTitle ) ) {
            return Status::newFatal( 'content-not-allowed-here',
                ContentHandler::getLocalizedName( $content->getModel() ),
                $this->mTitle->getPrefixedText()
            );
        }

        // Load the data from the master database if needed.
        // The caller may already loaded it from the master or even loaded it using
        // SELECT FOR UPDATE, so do not override that using clear().
        $this->loadPageData( 'fromdbmaster' );

        $user = $user ?: $wgUser;
        $flags = $this->checkFlags( $flags );

        // Trigger pre-save hook (using provided edit summary)
        $hookStatus = Status::newGood( [] );
        $hook_args = [ &$this, &$user, &$content, &$summary,
                            $flags & EDIT_MINOR, null, null, &$flags, &$hookStatus ];
        // Check if the hook rejected the attempted save
        if ( !Hooks::run( 'PageContentSave', $hook_args )
            || !ContentHandler::runLegacyHooks( 'ArticleSave', $hook_args )
        ) {
            if ( $hookStatus->isOK() ) {
                // Hook returned false but didn't call fatal(); use generic message
                $hookStatus->fatal( 'edit-hook-aborted' );
            }

            return $hookStatus;
        }

        $old_revision = $this->getRevision(); // current revision
        $old_content = $this->getContent( Revision::RAW ); // current revision's content

        // Provide autosummaries if one is not provided and autosummaries are enabled
        if ( $wgUseAutomaticEditSummaries && ( $flags & EDIT_AUTOSUMMARY ) && $summary == '' ) {
            $handler = $content->getContentHandler();
            $summary = $handler->getAutosummary( $old_content, $content, $flags );
        }

        // Get the pre-save transform content and final parser output
        $editInfo = $this->prepareContentForEdit( $content, null, $user, $serialFormat );
        $pstContent = $editInfo->pstContent; // Content object
        $meta = [
            'bot' => ( $flags & EDIT_FORCE_BOT ),
            'minor' => ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' ),
            'serialized' => $editInfo->pst,
            'serialFormat' => $serialFormat,
            'baseRevId' => $baseRevId,
            'oldRevision' => $old_revision,
            'oldContent' => $old_content,
            'oldId' => $this->getLatest(),
            'oldIsRedirect' => $this->isRedirect(),
            'oldCountable' => $this->isCountable(),
            'tags' => ( $tags !== null ) ? (array)$tags : []
        ];

        // Actually create the revision and create/update the page
        if ( $flags & EDIT_UPDATE ) {
            $status = $this->doModify( $pstContent, $flags, $user, $summary, $meta );
        } else {
            $status = $this->doCreate( $pstContent, $flags, $user, $summary, $meta );
        }

        // Promote user to any groups they meet the criteria for
        DeferredUpdates::addCallableUpdate( function () use ( $user ) {
            $user->addAutopromoteOnceGroups( 'onEdit' );
            $user->addAutopromoteOnceGroups( 'onView' ); // b/c
        } );

        return $status;
    }

    private function doModify(
        Content $content, $flags, User $user, $summary, array $meta
    ) {
        global $wgUseRCPatrol;

        // Update article, but only if changed.
        $status = Status::newGood( [ 'new' => false, 'revision' => null ] );

        // Convenience variables
        $now = wfTimestampNow();
        $oldid = $meta['oldId'];
        $oldContent = $meta['oldContent'];
        $newsize = $content->getSize();

        if ( !$oldid ) {
            // Article gone missing
            $status->fatal( 'edit-gone-missing' );

            return $status;
        } elseif ( !$oldContent ) {
            // Sanity check for bug 37225
            throw new MWException( "Could not find text for current revision {$oldid}." );
        }

        // @TODO: pass content object?!
        $revision = new Revision( [
            'page'       => $this->getId(),
            'title'      => $this->mTitle, // for determining the default content model
            'comment'    => $summary,
            'minor_edit' => $meta['minor'],
            'text'       => $meta['serialized'],
            'len'        => $newsize,
            'parent_id'  => $oldid,
            'user'       => $user->getId(),
            'user_text'  => $user->getName(),
            'timestamp'  => $now,
            'content_model' => $content->getModel(),
            'content_format' => $meta['serialFormat'],
        ] );

        $changed = !$content->equals( $oldContent );

        $dbw = wfGetDB( DB_MASTER );

        if ( $changed ) {
            $prepStatus = $content->prepareSave( $this, $flags, $oldid, $user );
            $status->merge( $prepStatus );
            if ( !$status->isOK() ) {
                return $status;
            }

            $dbw->startAtomic( __METHOD__ );
            // Get the latest page_latest value while locking it.
            // Do a CAS style check to see if it's the same as when this method
            // started. If it changed then bail out before touching the DB.
            $latestNow = $this->lockAndGetLatest();
            if ( $latestNow != $oldid ) {
                $dbw->endAtomic( __METHOD__ );
                // Page updated or deleted in the mean time
                $status->fatal( 'edit-conflict' );

                return $status;
            }

            // At this point we are now comitted to returning an OK
            // status unless some DB query error or other exception comes up.
            // This way callers don't have to call rollback() if $status is bad
            // unless they actually try to catch exceptions (which is rare).

            // Save the revision text
            $revisionId = $revision->insertOn( $dbw );
            // Update page_latest and friends to reflect the new revision
            if ( !$this->updateRevisionOn( $dbw, $revision, null, $meta['oldIsRedirect'] ) ) {
                $dbw->rollback( __METHOD__ ); // sanity; this should never happen
                throw new MWException( "Failed to update page row to use new revision." );
            }

            Hooks::run( 'NewRevisionFromEditComplete',
                [ $this, $revision, $meta['baseRevId'], $user ] );

            // Update recentchanges
            if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
                // Mark as patrolled if the user can do so
                $patrolled = $wgUseRCPatrol && !count(
                        $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
                // Add RC row to the DB
                RecentChange::notifyEdit(
                    $now,
                    $this->mTitle,
                    $revision->isMinor(),
                    $user,
                    $summary,
                    $oldid,
                    $this->getTimestamp(),
                    $meta['bot'],
                    '',
                    $oldContent ? $oldContent->getSize() : 0,
                    $newsize,
                    $revisionId,
                    $patrolled,
                    $meta['tags']
                );
            }

            $user->incEditCount();

            $dbw->endAtomic( __METHOD__ );
            $this->mTimestamp = $now;
        } else {
            // Bug 32948: revision ID must be set to page {{REVISIONID}} and
            // related variables correctly
            $revision->setId( $this->getLatest() );
        }

        if ( $changed ) {
            // Return the new revision to the caller
            $status->value['revision'] = $revision;
        } else {
            $status->warning( 'edit-no-change' );
            // Update page_touched as updateRevisionOn() was not called.
            // Other cache updates are managed in onArticleEdit() via doEditUpdates().
            $this->mTitle->invalidateCache( $now );
        }

        // Do secondary updates once the main changes have been committed...
        $that = $this;
        $dbw->onTransactionIdle(
            function () use (
                $dbw, &$that, $revision, &$user, $content, $summary, &$flags,
                $changed, $meta, &$status
            ) {
                // Do per-page updates in a transaction
                $dbw->setFlag( DBO_TRX );
                // Update links tables, site stats, etc.
                $that->doEditUpdates(
                    $revision,
                    $user,
                    [
                        'changed' => $changed,
                        'oldcountable' => $meta['oldCountable'],
                        'oldrevision' => $meta['oldRevision']
                    ]
                );
                // Trigger post-save hook
                $params = [ &$that, &$user, $content, $summary, $flags & EDIT_MINOR,
                    null, null, &$flags, $revision, &$status, $meta['baseRevId'] ];
                ContentHandler::runLegacyHooks( 'ArticleSaveComplete', $params );
                Hooks::run( 'PageContentSaveComplete', $params );
            }
        );

        return $status;
    }

    private function doCreate(
        Content $content, $flags, User $user, $summary, array $meta
    ) {
        global $wgUseRCPatrol, $wgUseNPPatrol;

        $status = Status::newGood( [ 'new' => true, 'revision' => null ] );

        $now = wfTimestampNow();
        $newsize = $content->getSize();
        $prepStatus = $content->prepareSave( $this, $flags, $meta['oldId'], $user );
        $status->merge( $prepStatus );
        if ( !$status->isOK() ) {
            return $status;
        }

        $dbw = wfGetDB( DB_MASTER );
        $dbw->startAtomic( __METHOD__ );

        // Add the page record unless one already exists for the title
        $newid = $this->insertOn( $dbw );
        if ( $newid === false ) {
            $dbw->endAtomic( __METHOD__ ); // nothing inserted
            $status->fatal( 'edit-already-exists' );

            return $status; // nothing done
        }

        // At this point we are now comitted to returning an OK
        // status unless some DB query error or other exception comes up.
        // This way callers don't have to call rollback() if $status is bad
        // unless they actually try to catch exceptions (which is rare).

        // @TODO: pass content object?!
        $revision = new Revision( [
            'page'       => $newid,
            'title'      => $this->mTitle, // for determining the default content model
            'comment'    => $summary,
            'minor_edit' => $meta['minor'],
            'text'       => $meta['serialized'],
            'len'        => $newsize,
            'user'       => $user->getId(),
            'user_text'  => $user->getName(),
            'timestamp'  => $now,
            'content_model' => $content->getModel(),
            'content_format' => $meta['serialFormat'],
        ] );

        // Save the revision text...
        $revisionId = $revision->insertOn( $dbw );
        // Update the page record with revision data
        if ( !$this->updateRevisionOn( $dbw, $revision, 0 ) ) {
            $dbw->rollback( __METHOD__ ); // sanity; this should never happen
            throw new MWException( "Failed to update page row to use new revision." );
        }

        Hooks::run( 'NewRevisionFromEditComplete', [ $this, $revision, false, $user ] );

        // Update recentchanges
        if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
            // Mark as patrolled if the user can do so
            $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) &&
                !count( $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
            // Add RC row to the DB
            RecentChange::notifyNew(
                $now,
                $this->mTitle,
                $revision->isMinor(),
                $user,
                $summary,
                $meta['bot'],
                '',
                $newsize,
                $revisionId,
                $patrolled,
                $meta['tags']
            );
        }

        $user->incEditCount();

        $dbw->endAtomic( __METHOD__ );
        $this->mTimestamp = $now;

        // Return the new revision to the caller
        $status->value['revision'] = $revision;

        // Do secondary updates once the main changes have been committed...
        $that = $this;
        $dbw->onTransactionIdle(
            function () use (
                &$that, $dbw, $revision, &$user, $content, $summary, &$flags, $meta, &$status
            ) {
                // Do per-page updates in a transaction
                $dbw->setFlag( DBO_TRX );
                // Update links, etc.
                $that->doEditUpdates( $revision, $user, [ 'created' => true ] );
                // Trigger post-create hook
                $params = [ &$that, &$user, $content, $summary,
                    $flags & EDIT_MINOR, null, null, &$flags, $revision ];
                ContentHandler::runLegacyHooks( 'ArticleInsertComplete', $params );
                Hooks::run( 'PageContentInsertComplete', $params );
                // Trigger post-save hook
                $params = array_merge( $params, [ &$status, $meta['baseRevId'] ] );
                ContentHandler::runLegacyHooks( 'ArticleSaveComplete', $params );
                Hooks::run( 'PageContentSaveComplete', $params );

            }
        );

        return $status;
    }

    public function makeParserOptions( $context ) {
        $options = $this->getContentHandler()->makeParserOptions( $context );

        if ( $this->getTitle()->isConversionTable() ) {
            // @todo ConversionTable should become a separate content model, so
            // we don't need special cases like this one.
            $options->disableContentConversion();
        }

        return $options;
    }

    public function prepareTextForEdit( $text, $revid = null, User $user = null ) {
        ContentHandler::deprecated( __METHOD__, '1.21' );
        $content = ContentHandler::makeContent( $text, $this->getTitle() );
        return $this->prepareContentForEdit( $content, $revid, $user );
    }

    public function prepareContentForEdit(
        Content $content, $revision = null, User $user = null,
        $serialFormat = null, $useCache = true
    ) {
        global $wgContLang, $wgUser, $wgAjaxEditStash;

        if ( is_object( $revision ) ) {
            $revid = $revision->getId();
        } else {
            $revid = $revision;
            // This code path is deprecated, and nothing is known to
            // use it, so performance here shouldn't be a worry.
            if ( $revid !== null ) {
                $revision = Revision::newFromId( $revid, Revision::READ_LATEST );
            } else {
                $revision = null;
            }
        }

        $user = is_null( $user ) ? $wgUser : $user;
        // XXX: check $user->getId() here???

        // Use a sane default for $serialFormat, see bug 57026
        if ( $serialFormat === null ) {
            $serialFormat = $content->getContentHandler()->getDefaultFormat();
        }

        if ( $this->mPreparedEdit
            && $this->mPreparedEdit->newContent
            && $this->mPreparedEdit->newContent->equals( $content )
            && $this->mPreparedEdit->revid == $revid
            && $this->mPreparedEdit->format == $serialFormat
            // XXX: also check $user here?
        ) {
            // Already prepared
            return $this->mPreparedEdit;
        }

        // The edit may have already been prepared via api.php?action=stashedit
        $cachedEdit = $useCache && $wgAjaxEditStash
            ? ApiStashEdit::checkCache( $this->getTitle(), $content, $user )
            : false;

        $popts = ParserOptions::newFromUserAndLang( $user, $wgContLang );
        Hooks::run( 'ArticlePrepareTextForEdit', [ $this, $popts ] );

        $edit = (object)[];
        if ( $cachedEdit ) {
            $edit->timestamp = $cachedEdit->timestamp;
        } else {
            $edit->timestamp = wfTimestampNow();
        }
        // @note: $cachedEdit is not used if the rev ID was referenced in the text
        $edit->revid = $revid;

        if ( $cachedEdit ) {
            $edit->pstContent = $cachedEdit->pstContent;
        } else {
            $edit->pstContent = $content
                ? $content->preSaveTransform( $this->mTitle, $user, $popts )
                : null;
        }

        $edit->format = $serialFormat;
        $edit->popts = $this->makeParserOptions( 'canonical' );
        if ( $cachedEdit ) {
            $edit->output = $cachedEdit->output;
        } else {
            if ( $revision ) {
                // We get here if vary-revision is set. This means that this page references
                // itself (such as via self-transclusion). In this case, we need to make sure
                // that any such self-references refer to the newly-saved revision, and not
                // to the previous one, which could otherwise happen due to slave lag.
                $oldCallback = $edit->popts->getCurrentRevisionCallback();
                $edit->popts->setCurrentRevisionCallback(
                    function ( Title $title, $parser = false ) use ( $revision, &$oldCallback ) {
                        if ( $title->equals( $revision->getTitle() ) ) {
                            return $revision;
                        } else {
                            return call_user_func( $oldCallback, $title, $parser );
                        }
                    }
                );
            }
            $edit->output = $edit->pstContent
                ? $edit->pstContent->getParserOutput( $this->mTitle, $revid, $edit->popts )
                : null;
        }

        $edit->newContent = $content;
        $edit->oldContent = $this->getContent( Revision::RAW );

        // NOTE: B/C for hooks! don't use these fields!
        $edit->newText = $edit->newContent
            ? ContentHandler::getContentText( $edit->newContent )
            : '';
        $edit->oldText = $edit->oldContent
            ? ContentHandler::getContentText( $edit->oldContent )
            : '';
        $edit->pst = $edit->pstContent ? $edit->pstContent->serialize( $serialFormat ) : '';

        if ( $edit->output ) {
            $edit->output->setCacheTime( wfTimestampNow() );
        }

        // Process cache the result
        $this->mPreparedEdit = $edit;

        return $edit;
    }

    public function doEditUpdates( Revision $revision, User $user, array $options = [] ) {
        global $wgRCWatchCategoryMembership, $wgContLang;

        $options += [
            'changed' => true,
            'created' => false,
            'moved' => false,
            'restored' => false,
            'oldrevision' => null,
            'oldcountable' => null
        ];
        $content = $revision->getContent();

        // Parse the text
        // Be careful not to do pre-save transform twice: $text is usually
        // already pre-save transformed once.
        if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
            wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
            $editInfo = $this->prepareContentForEdit( $content, $revision, $user );
        } else {
            wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
            $editInfo = $this->mPreparedEdit;
        }

        // Save it to the parser cache.
        // Make sure the cache time matches page_touched to avoid double parsing.
        ParserCache::singleton()->save(
            $editInfo->output, $this, $editInfo->popts,
            $revision->getTimestamp(), $editInfo->revid
        );

        // Update the links tables and other secondary data
        if ( $content ) {
            $recursive = $options['changed']; // bug 50785
            $updates = $content->getSecondaryDataUpdates(
                $this->getTitle(), null, $recursive, $editInfo->output
            );
            foreach ( $updates as $update ) {
                if ( $update instanceof LinksUpdate ) {
                    $update->setRevision( $revision );
                    $update->setTriggeringUser( $user );
                }
                DeferredUpdates::addUpdate( $update );
            }
            if ( $wgRCWatchCategoryMembership
                && $this->getContentHandler()->supportsCategories() === true
                && ( $options['changed'] || $options['created'] )
                && !$options['restored']
            ) {
                // Note: jobs are pushed after deferred updates, so the job should be able to see
                // the recent change entry (also done via deferred updates) and carry over any
                // bot/deletion/IP flags, ect.
                JobQueueGroup::singleton()->lazyPush( new CategoryMembershipChangeJob(
                    $this->getTitle(),
                    [
                        'pageId' => $this->getId(),
                        'revTimestamp' => $revision->getTimestamp()
                    ]
                ) );
            }
        }

        Hooks::run( 'ArticleEditUpdates', [ &$this, &$editInfo, $options['changed'] ] );

        if ( Hooks::run( 'ArticleEditUpdatesDeleteFromRecentchanges', [ &$this ] ) ) {
            // Flush old entries from the `recentchanges` table
            if ( mt_rand( 0, 9 ) == 0 ) {
                JobQueueGroup::singleton()->lazyPush( RecentChangesUpdateJob::newPurgeJob() );
            }
        }

        if ( !$this->exists() ) {
            return;
        }

        $id = $this->getId();
        $title = $this->mTitle->getPrefixedDBkey();
        $shortTitle = $this->mTitle->getDBkey();

        if ( $options['oldcountable'] === 'no-change' ||
            ( !$options['changed'] && !$options['moved'] )
        ) {
            $good = 0;
        } elseif ( $options['created'] ) {
            $good = (int)$this->isCountable( $editInfo );
        } elseif ( $options['oldcountable'] !== null ) {
            $good = (int)$this->isCountable( $editInfo ) - (int)$options['oldcountable'];
        } else {
            $good = 0;
        }
        $edits = $options['changed'] ? 1 : 0;
        $total = $options['created'] ? 1 : 0;

        DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, $edits, $good, $total ) );
        DeferredUpdates::addUpdate( new SearchUpdate( $id, $title, $content ) );

        // If this is another user's talk page, update newtalk.
        // Don't do this if $options['changed'] = false (null-edits) nor if
        // it's a minor edit and the user doesn't want notifications for those.
        if ( $options['changed']
            && $this->mTitle->getNamespace() == NS_USER_TALK
            && $shortTitle != $user->getTitleKey()
            && !( $revision->isMinor() && $user->isAllowed( 'nominornewtalk' ) )
        ) {
            $recipient = User::newFromName( $shortTitle, false );
            if ( !$recipient ) {
                wfDebug( __METHOD__ . ": invalid username\n" );
            } else {
                // Allow extensions to prevent user notification
                // when a new message is added to their talk page
                if ( Hooks::run( 'ArticleEditUpdateNewTalk', [ &$this, $recipient ] ) ) {
                    if ( User::isIP( $shortTitle ) ) {
                        // An anonymous user
                        $recipient->setNewtalk( true, $revision );
                    } elseif ( $recipient->isLoggedIn() ) {
                        $recipient->setNewtalk( true, $revision );
                    } else {
                        wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
                    }
                }
            }
        }

        if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
            // XXX: could skip pseudo-messages like js/css here, based on content model.
            $msgtext = $content ? $content->getWikitextForTransclusion() : null;
            if ( $msgtext === false || $msgtext === null ) {
                $msgtext = '';
            }

            MessageCache::singleton()->replace( $shortTitle, $msgtext );

            if ( $wgContLang->hasVariants() ) {
                $wgContLang->updateConversionTable( $this->mTitle );
            }
        }

        if ( $options['created'] ) {
            self::onArticleCreate( $this->mTitle );
        } elseif ( $options['changed'] ) { // bug 50785
            self::onArticleEdit( $this->mTitle, $revision );
        }
    }

    public function doQuickEditContent(
        Content $content, User $user, $comment = '', $minor = false, $serialFormat = null
    ) {

        $serialized = $content->serialize( $serialFormat );

        $dbw = wfGetDB( DB_MASTER );
        $revision = new Revision( [
            'title'      => $this->getTitle(), // for determining the default content model
            'page'       => $this->getId(),
            'user_text'  => $user->getName(),
            'user'       => $user->getId(),
            'text'       => $serialized,
            'length'     => $content->getSize(),
            'comment'    => $comment,
            'minor_edit' => $minor ? 1 : 0,
        ] ); // XXX: set the content object?
        $revision->insertOn( $dbw );
        $this->updateRevisionOn( $dbw, $revision );

        Hooks::run( 'NewRevisionFromEditComplete', [ $this, $revision, false, $user ] );

    }

    public function doUpdateRestrictions( array $limit, array $expiry,
        &$cascade, $reason, User $user, $tags = null
    ) {
        global $wgCascadingRestrictionLevels, $wgContLang;

        if ( wfReadOnly() ) {
            return Status::newFatal( 'readonlytext', wfReadOnlyReason() );
        }

        $this->loadPageData( 'fromdbmaster' );
        $restrictionTypes = $this->mTitle->getRestrictionTypes();
        $id = $this->getId();

        if ( !$cascade ) {
            $cascade = false;
        }

        // Take this opportunity to purge out expired restrictions
        Title::purgeExpiredRestrictions();

        // @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
        // we expect a single selection, but the schema allows otherwise.
        $isProtected = false;
        $protect = false;
        $changed = false;

        $dbw = wfGetDB( DB_MASTER );

        foreach ( $restrictionTypes as $action ) {
            if ( !isset( $expiry[$action] ) || $expiry[$action] === $dbw->getInfinity() ) {
                $expiry[$action] = 'infinity';
            }
            if ( !isset( $limit[$action] ) ) {
                $limit[$action] = '';
            } elseif ( $limit[$action] != '' ) {
                $protect = true;
            }

            // Get current restrictions on $action
            $current = implode( '', $this->mTitle->getRestrictions( $action ) );
            if ( $current != '' ) {
                $isProtected = true;
            }

            if ( $limit[$action] != $current ) {
                $changed = true;
            } elseif ( $limit[$action] != '' ) {
                // Only check expiry change if the action is actually being
                // protected, since expiry does nothing on an not-protected
                // action.
                if ( $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] ) {
                    $changed = true;
                }
            }
        }

        if ( !$changed && $protect && $this->mTitle->areRestrictionsCascading() != $cascade ) {
            $changed = true;
        }

        // If nothing has changed, do nothing
        if ( !$changed ) {
            return Status::newGood();
        }

        if ( !$protect ) { // No protection at all means unprotection
            $revCommentMsg = 'unprotectedarticle';
            $logAction = 'unprotect';
        } elseif ( $isProtected ) {
            $revCommentMsg = 'modifiedarticleprotection';
            $logAction = 'modify';
        } else {
            $revCommentMsg = 'protectedarticle';
            $logAction = 'protect';
        }

        // Truncate for whole multibyte characters
        $reason = $wgContLang->truncate( $reason, 255 );

        $logRelationsValues = [];
        $logRelationsField = null;
        $logParamsDetails = [];

        // Null revision (used for change tag insertion)
        $nullRevision = null;

        if ( $id ) { // Protection of existing page
            if ( !Hooks::run( 'ArticleProtect', [ &$this, &$user, $limit, $reason ] ) ) {
                return Status::newGood();
            }

            // Only certain restrictions can cascade...
            $editrestriction = isset( $limit['edit'] )
                ? [ $limit['edit'] ]
                : $this->mTitle->getRestrictions( 'edit' );
            foreach ( array_keys( $editrestriction, 'sysop' ) as $key ) {
                $editrestriction[$key] = 'editprotected'; // backwards compatibility
            }
            foreach ( array_keys( $editrestriction, 'autoconfirmed' ) as $key ) {
                $editrestriction[$key] = 'editsemiprotected'; // backwards compatibility
            }

            $cascadingRestrictionLevels = $wgCascadingRestrictionLevels;
            foreach ( array_keys( $cascadingRestrictionLevels, 'sysop' ) as $key ) {
                $cascadingRestrictionLevels[$key] = 'editprotected'; // backwards compatibility
            }
            foreach ( array_keys( $cascadingRestrictionLevels, 'autoconfirmed' ) as $key ) {
                $cascadingRestrictionLevels[$key] = 'editsemiprotected'; // backwards compatibility
            }

            // The schema allows multiple restrictions
            if ( !array_intersect( $editrestriction, $cascadingRestrictionLevels ) ) {
                $cascade = false;
            }

            // insert null revision to identify the page protection change as edit summary
            $latest = $this->getLatest();
            $nullRevision = $this->insertProtectNullRevision(
                $revCommentMsg,
                $limit,
                $expiry,
                $cascade,
                $reason,
                $user
            );

            if ( $nullRevision === null ) {
                return Status::newFatal( 'no-null-revision', $this->mTitle->getPrefixedText() );
            }

            $logRelationsField = 'pr_id';

            // Update restrictions table
            foreach ( $limit as $action => $restrictions ) {
                $dbw->delete(
                    'page_restrictions',
                    [
                        'pr_page' => $id,
                        'pr_type' => $action
                    ],
                    __METHOD__
                );
                if ( $restrictions != '' ) {
                    $cascadeValue = ( $cascade && $action == 'edit' ) ? 1 : 0;
                    $dbw->insert(
                        'page_restrictions',
                        [
                            'pr_id' => $dbw->nextSequenceValue( 'page_restrictions_pr_id_seq' ),
                            'pr_page' => $id,
                            'pr_type' => $action,
                            'pr_level' => $restrictions,
                            'pr_cascade' => $cascadeValue,
                            'pr_expiry' => $dbw->encodeExpiry( $expiry[$action] )
                        ],
                        __METHOD__
                    );
                    $logRelationsValues[] = $dbw->insertId();
                    $logParamsDetails[] = [
                        'type' => $action,
                        'level' => $restrictions,
                        'expiry' => $expiry[$action],
                        'cascade' => (bool)$cascadeValue,
                    ];
                }
            }

            // Clear out legacy restriction fields
            $dbw->update(
                'page',
                [ 'page_restrictions' => '' ],
                [ 'page_id' => $id ],
                __METHOD__
            );

            Hooks::run( 'NewRevisionFromEditComplete',
                [ $this, $nullRevision, $latest, $user ] );
            Hooks::run( 'ArticleProtectComplete', [ &$this, &$user, $limit, $reason ] );
        } else { // Protection of non-existing page (also known as "title protection")
            // Cascade protection is meaningless in this case
            $cascade = false;

            if ( $limit['create'] != '' ) {
                $dbw->replace( 'protected_titles',
                    [ [ 'pt_namespace', 'pt_title' ] ],
                    [
                        'pt_namespace' => $this->mTitle->getNamespace(),
                        'pt_title' => $this->mTitle->getDBkey(),
                        'pt_create_perm' => $limit['create'],
                        'pt_timestamp' => $dbw->timestamp(),
                        'pt_expiry' => $dbw->encodeExpiry( $expiry['create'] ),
                        'pt_user' => $user->getId(),
                        'pt_reason' => $reason,
                    ], __METHOD__
                );
                $logParamsDetails[] = [
                    'type' => 'create',
                    'level' => $limit['create'],
                    'expiry' => $expiry['create'],
                ];
            } else {
                $dbw->delete( 'protected_titles',
                    [
                        'pt_namespace' => $this->mTitle->getNamespace(),
                        'pt_title' => $this->mTitle->getDBkey()
                    ], __METHOD__
                );
            }
        }

        $this->mTitle->flushRestrictions();
        InfoAction::invalidateCache( $this->mTitle );

        if ( $logAction == 'unprotect' ) {
            $params = [];
        } else {
            $protectDescriptionLog = $this->protectDescriptionLog( $limit, $expiry );
            $params = [
                '4::description' => $protectDescriptionLog, // parameter for IRC
                '5:bool:cascade' => $cascade,
                'details' => $logParamsDetails, // parameter for localize and api
            ];
        }

        // Update the protection log
        $logEntry = new ManualLogEntry( 'protect', $logAction );
        $logEntry->setTarget( $this->mTitle );
        $logEntry->setComment( $reason );
        $logEntry->setPerformer( $user );
        $logEntry->setParameters( $params );
        if ( !is_null( $nullRevision ) ) {
            $logEntry->setAssociatedRevId( $nullRevision->getId() );
        }
        $logEntry->setTags( $tags );
        if ( $logRelationsField !== null && count( $logRelationsValues ) ) {
            $logEntry->setRelations( [ $logRelationsField => $logRelationsValues ] );
        }
        $logId = $logEntry->insert();
        $logEntry->publish( $logId );

        return Status::newGood( $logId );
    }

    public function insertProtectNullRevision( $revCommentMsg, array $limit,
        array $expiry, $cascade, $reason, $user = null
    ) {
        global $wgContLang;
        $dbw = wfGetDB( DB_MASTER );

        // Prepare a null revision to be added to the history
        $editComment = $wgContLang->ucfirst(
            wfMessage(
                $revCommentMsg,
                $this->mTitle->getPrefixedText()
            )->inContentLanguage()->text()
        );
        if ( $reason ) {
            $editComment .= wfMessage( 'colon-separator' )->inContentLanguage()->text() . $reason;
        }
        $protectDescription = $this->protectDescription( $limit, $expiry );
        if ( $protectDescription ) {
            $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
            $editComment .= wfMessage( 'parentheses' )->params( $protectDescription )
                ->inContentLanguage()->text();
        }
        if ( $cascade ) {
            $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
            $editComment .= wfMessage( 'brackets' )->params(
                wfMessage( 'protect-summary-cascade' )->inContentLanguage()->text()
            )->inContentLanguage()->text();
        }

        $nullRev = Revision::newNullRevision( $dbw, $this->getId(), $editComment, true, $user );
        if ( $nullRev ) {
            $nullRev->insertOn( $dbw );

            // Update page record and touch page
            $oldLatest = $nullRev->getParentId();
            $this->updateRevisionOn( $dbw, $nullRev, $oldLatest );
        }

        return $nullRev;
    }

    protected function formatExpiry( $expiry ) {
        global $wgContLang;

        if ( $expiry != 'infinity' ) {
            return wfMessage(
                'protect-expiring',
                $wgContLang->timeanddate( $expiry, false, false ),
                $wgContLang->date( $expiry, false, false ),
                $wgContLang->time( $expiry, false, false )
            )->inContentLanguage()->text();
        } else {
            return wfMessage( 'protect-expiry-indefinite' )
                ->inContentLanguage()->text();
        }
    }

    public function protectDescription( array $limit, array $expiry ) {
        $protectDescription = '';

        foreach ( array_filter( $limit ) as $action => $restrictions ) {
            # $action is one of $wgRestrictionTypes = array( 'create', 'edit', 'move', 'upload' ).
            # All possible message keys are listed here for easier grepping:
            # * restriction-create
            # * restriction-edit
            # * restriction-move
            # * restriction-upload
            $actionText = wfMessage( 'restriction-' . $action )->inContentLanguage()->text();
            # $restrictions is one of $wgRestrictionLevels = array( '', 'autoconfirmed', 'sysop' ),
            # with '' filtered out. All possible message keys are listed below:
            # * protect-level-autoconfirmed
            # * protect-level-sysop
            $restrictionsText = wfMessage( 'protect-level-' . $restrictions )
                ->inContentLanguage()->text();

            $expiryText = $this->formatExpiry( $expiry[$action] );

            if ( $protectDescription !== '' ) {
                $protectDescription .= wfMessage( 'word-separator' )->inContentLanguage()->text();
            }
            $protectDescription .= wfMessage( 'protect-summary-desc' )
                ->params( $actionText, $restrictionsText, $expiryText )
                ->inContentLanguage()->text();
        }

        return $protectDescription;
    }

    public function protectDescriptionLog( array $limit, array $expiry ) {
        global $wgContLang;

        $protectDescriptionLog = '';

        foreach ( array_filter( $limit ) as $action => $restrictions ) {
            $expiryText = $this->formatExpiry( $expiry[$action] );
            $protectDescriptionLog .= $wgContLang->getDirMark() .
                "[$action=$restrictions] ($expiryText)";
        }

        return trim( $protectDescriptionLog );
    }

    protected static function flattenRestrictions( $limit ) {
        if ( !is_array( $limit ) ) {
            throw new MWException( __METHOD__ . ' given non-array restriction set' );
        }

        $bits = [];
        ksort( $limit );

        foreach ( array_filter( $limit ) as $action => $restrictions ) {
            $bits[] = "$action=$restrictions";
        }

        return implode( ':', $bits );
    }

    public function doDeleteArticle(
        $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', User $user = null
    ) {
        $status = $this->doDeleteArticleReal( $reason, $suppress, $u1, $u2, $error, $user );
        return $status->isGood();
    }

    public function doDeleteArticleReal(
        $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', User $user = null
    ) {
        global $wgUser, $wgContentHandlerUseDB;

        wfDebug( __METHOD__ . "\n" );

        $status = Status::newGood();

        if ( $this->mTitle->getDBkey() === '' ) {
            $status->error( 'cannotdelete',
                wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
            return $status;
        }

        $user = is_null( $user ) ? $wgUser : $user;
        if ( !Hooks::run( 'ArticleDelete',
            [ &$this, &$user, &$reason, &$error, &$status, $suppress ]
        ) ) {
            if ( $status->isOK() ) {
                // Hook aborted but didn't set a fatal status
                $status->fatal( 'delete-hook-aborted' );
            }
            return $status;
        }

        $dbw = wfGetDB( DB_MASTER );
        $dbw->startAtomic( __METHOD__ );

        $this->loadPageData( self::READ_LATEST );
        $id = $this->getId();
        // T98706: lock the page from various other updates but avoid using
        // WikiPage::READ_LOCKING as that will carry over the FOR UPDATE to
        // the revisions queries (which also JOIN on user). Only lock the page
        // row and CAS check on page_latest to see if the trx snapshot matches.
        $lockedLatest = $this->lockAndGetLatest();
        if ( $id == 0 || $this->getLatest() != $lockedLatest ) {
            $dbw->endAtomic( __METHOD__ );
            // Page not there or trx snapshot is stale
            $status->error( 'cannotdelete',
                wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
            return $status;
        }

        // At this point we are now comitted to returning an OK
        // status unless some DB query error or other exception comes up.
        // This way callers don't have to call rollback() if $status is bad
        // unless they actually try to catch exceptions (which is rare).

        // we need to remember the old content so we can use it to generate all deletion updates.
        $content = $this->getContent( Revision::RAW );

        // Bitfields to further suppress the content
        if ( $suppress ) {
            $bitfield = 0;
            // This should be 15...
            $bitfield |= Revision::DELETED_TEXT;
            $bitfield |= Revision::DELETED_COMMENT;
            $bitfield |= Revision::DELETED_USER;
            $bitfield |= Revision::DELETED_RESTRICTED;
        } else {
            $bitfield = 'rev_deleted';
        }

        $row = [
            'ar_namespace'  => 'page_namespace',
            'ar_title'      => 'page_title',
            'ar_comment'    => 'rev_comment',
            'ar_user'       => 'rev_user',
            'ar_user_text'  => 'rev_user_text',
            'ar_timestamp'  => 'rev_timestamp',
            'ar_minor_edit' => 'rev_minor_edit',
            'ar_rev_id'     => 'rev_id',
            'ar_parent_id'  => 'rev_parent_id',
            'ar_text_id'    => 'rev_text_id',
            'ar_text'       => '\'\'', // Be explicit to appease
            'ar_flags'      => '\'\'', // MySQL's "strict mode"...
            'ar_len'        => 'rev_len',
            'ar_page_id'    => 'page_id',
            'ar_deleted'    => $bitfield,
            'ar_sha1'       => 'rev_sha1',
        ];

        if ( $wgContentHandlerUseDB ) {
            $row['ar_content_model'] = 'rev_content_model';
            $row['ar_content_format'] = 'rev_content_format';
        }

        // Copy all the page revisions into the archive table
        $dbw->insertSelect(
            'archive',
            [ 'page', 'revision' ],
            $row,
            [
                'page_id' => $id,
                'page_id = rev_page'
            ],
            __METHOD__
        );

        // Now that it's safely backed up, delete it
        $dbw->delete( 'page', [ 'page_id' => $id ], __METHOD__ );

        if ( !$dbw->cascadingDeletes() ) {
            $dbw->delete( 'revision', [ 'rev_page' => $id ], __METHOD__ );
        }

        // Clone the title, so we have the information we need when we log
        $logTitle = clone $this->mTitle;

        // Log the deletion, if the page was suppressed, put it in the suppression log instead
        $logtype = $suppress ? 'suppress' : 'delete';

        $logEntry = new ManualLogEntry( $logtype, 'delete' );
        $logEntry->setPerformer( $user );
        $logEntry->setTarget( $logTitle );
        $logEntry->setComment( $reason );
        $logid = $logEntry->insert();

        $dbw->onTransactionPreCommitOrIdle( function () use ( $dbw, $logEntry, $logid ) {
            // Bug 56776: avoid deadlocks (especially from FileDeleteForm)
            $logEntry->publish( $logid );
        } );

        $dbw->endAtomic( __METHOD__ );

        $this->doDeleteUpdates( $id, $content );

        Hooks::run( 'ArticleDeleteComplete',
            [ &$this, &$user, $reason, $id, $content, $logEntry ] );
        $status->value = $logid;

        // Show log excerpt on 404 pages rather than just a link
        $cache = ObjectCache::getMainStashInstance();
        $key = wfMemcKey( 'page-recent-delete', md5( $logTitle->getPrefixedText() ) );
        $cache->set( $key, 1, $cache::TTL_DAY );

        return $status;
    }

    public function lockAndGetLatest() {
        return (int)wfGetDB( DB_MASTER )->selectField(
            'page',
            'page_latest',
            [
                'page_id' => $this->getId(),
                // Typically page_id is enough, but some code might try to do
                // updates assuming the title is the same, so verify that
                'page_namespace' => $this->getTitle()->getNamespace(),
                'page_title' => $this->getTitle()->getDBkey()
            ],
            __METHOD__,
            [ 'FOR UPDATE' ]
        );
    }

    public function doDeleteUpdates( $id, Content $content = null ) {
        // Update site status
        DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, - (int)$this->isCountable(), -1 ) );

        // Delete pagelinks, update secondary indexes, etc
        $updates = $this->getDeletionUpdates( $content );
        foreach ( $updates as $update ) {
            DeferredUpdates::addUpdate( $update );
        }

        // Reparse any pages transcluding this page
        LinksUpdate::queueRecursiveJobsForTable( $this->mTitle, 'templatelinks' );

        // Reparse any pages including this image
        if ( $this->mTitle->getNamespace() == NS_FILE ) {
            LinksUpdate::queueRecursiveJobsForTable( $this->mTitle, 'imagelinks' );
        }

        // Clear caches
        WikiPage::onArticleDelete( $this->mTitle );

        // Reset this object and the Title object
        $this->loadFromRow( false, self::READ_LATEST );

        // Search engine
        DeferredUpdates::addUpdate( new SearchUpdate( $id, $this->mTitle ) );
    }

    public function doRollback(
        $fromP, $summary, $token, $bot, &$resultDetails, User $user, $tags = null
    ) {
        $resultDetails = null;

        // Check permissions
        $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
        $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
        $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );

        if ( !$user->matchEditToken( $token, [ $this->mTitle->getPrefixedText(), $fromP ] ) ) {
            $errors[] = [ 'sessionfailure' ];
        }

        if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
            $errors[] = [ 'actionthrottledtext' ];
        }

        // If there were errors, bail out now
        if ( !empty( $errors ) ) {
            return $errors;
        }

        return $this->commitRollback( $fromP, $summary, $bot, $resultDetails, $user, $tags );
    }

    public function commitRollback( $fromP, $summary, $bot,
        &$resultDetails, User $guser, $tags = null
    ) {
        global $wgUseRCPatrol, $wgContLang;

        $dbw = wfGetDB( DB_MASTER );

        if ( wfReadOnly() ) {
            return [ [ 'readonlytext' ] ];
        }

        // Get the last editor
        $current = $this->getRevision();
        if ( is_null( $current ) ) {
            // Something wrong... no page?
            return [ [ 'notanarticle' ] ];
        }

        $from = str_replace( '_', ' ', $fromP );
        // User name given should match up with the top revision.
        // If the user was deleted then $from should be empty.
        if ( $from != $current->getUserText() ) {
            $resultDetails = [ 'current' => $current ];
            return [ [ 'alreadyrolled',
                htmlspecialchars( $this->mTitle->getPrefixedText() ),
                htmlspecialchars( $fromP ),
                htmlspecialchars( $current->getUserText() )
            ] ];
        }

        // Get the last edit not by this person...
        // Note: these may not be public values
        $user = intval( $current->getUser( Revision::RAW ) );
        $user_text = $dbw->addQuotes( $current->getUserText( Revision::RAW ) );
        $s = $dbw->selectRow( 'revision',
            [ 'rev_id', 'rev_timestamp', 'rev_deleted' ],
            [ 'rev_page' => $current->getPage(),
                "rev_user != {$user} OR rev_user_text != {$user_text}"
            ], __METHOD__,
            [ 'USE INDEX' => 'page_timestamp',
                'ORDER BY' => 'rev_timestamp DESC' ]
            );
        if ( $s === false ) {
            // No one else ever edited this page
            return [ [ 'cantrollback' ] ];
        } elseif ( $s->rev_deleted & Revision::DELETED_TEXT
            || $s->rev_deleted & Revision::DELETED_USER
        ) {
            // Only admins can see this text
            return [ [ 'notvisiblerev' ] ];
        }

        // Generate the edit summary if necessary
        $target = Revision::newFromId( $s->rev_id, Revision::READ_LATEST );
        if ( empty( $summary ) ) {
            if ( $from == '' ) { // no public user name
                $summary = wfMessage( 'revertpage-nouser' );
            } else {
                $summary = wfMessage( 'revertpage' );
            }
        }

        // Allow the custom summary to use the same args as the default message
        $args = [
            $target->getUserText(), $from, $s->rev_id,
            $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
            $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
        ];
        if ( $summary instanceof Message ) {
            $summary = $summary->params( $args )->inContentLanguage()->text();
        } else {
            $summary = wfMsgReplaceArgs( $summary, $args );
        }

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

        // Truncate for whole multibyte characters.
        $summary = $wgContLang->truncate( $summary, 255 );

        // Save
        $flags = EDIT_UPDATE;

        if ( $guser->isAllowed( 'minoredit' ) ) {
            $flags |= EDIT_MINOR;
        }

        if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
            $flags |= EDIT_FORCE_BOT;
        }

        // Actually store the edit
        $status = $this->doEditContent(
            $target->getContent(),
            $summary,
            $flags,
            $target->getId(),
            $guser,
            null,
            $tags
        );

        // Set patrolling and bot flag on the edits, which gets rollbacked.
        // This is done even on edit failure to have patrolling in that case (bug 62157).
        $set = [];
        if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
            // Mark all reverted edits as bot
            $set['rc_bot'] = 1;
        }

        if ( $wgUseRCPatrol ) {
            // Mark all reverted edits as patrolled
            $set['rc_patrolled'] = 1;
        }

        if ( count( $set ) ) {
            $dbw->update( 'recentchanges', $set,
                [ /* WHERE */
                    'rc_cur_id' => $current->getPage(),
                    'rc_user_text' => $current->getUserText(),
                    'rc_timestamp > ' . $dbw->addQuotes( $s->rev_timestamp ),
                ],
                __METHOD__
            );
        }

        if ( !$status->isOK() ) {
            return $status->getErrorsArray();
        }

        // raise error, when the edit is an edit without a new version
        $statusRev = isset( $status->value['revision'] )
            ? $status->value['revision']
            : null;
        if ( !( $statusRev instanceof Revision ) ) {
            $resultDetails = [ 'current' => $current ];
            return [ [ 'alreadyrolled',
                    htmlspecialchars( $this->mTitle->getPrefixedText() ),
                    htmlspecialchars( $fromP ),
                    htmlspecialchars( $current->getUserText() )
            ] ];
        }

        $revId = $statusRev->getId();

        Hooks::run( 'ArticleRollbackComplete', [ $this, $guser, $target, $current ] );

        $resultDetails = [
            'summary' => $summary,
            'current' => $current,
            'target' => $target,
            'newid' => $revId
        ];

        return [];
    }

    public static function onArticleCreate( Title $title ) {
        // Update existence markers on article/talk tabs...
        $other = $title->getOtherPage();

        $other->purgeSquid();

        $title->touchLinks();
        $title->purgeSquid();
        $title->deleteTitleProtection();
    }

    public static function onArticleDelete( Title $title ) {
        global $wgContLang;

        // Update existence markers on article/talk tabs...
        $other = $title->getOtherPage();

        $other->purgeSquid();

        $title->touchLinks();
        $title->purgeSquid();

        // File cache
        HTMLFileCache::clearFileCache( $title );
        InfoAction::invalidateCache( $title );

        // Messages
        if ( $title->getNamespace() == NS_MEDIAWIKI ) {
            MessageCache::singleton()->replace( $title->getDBkey(), false );

            if ( $wgContLang->hasVariants() ) {
                $wgContLang->updateConversionTable( $title );
            }
        }

        // Images
        if ( $title->getNamespace() == NS_FILE ) {
            DeferredUpdates::addUpdate( new HTMLCacheUpdate( $title, 'imagelinks' ) );
        }

        // User talk pages
        if ( $title->getNamespace() == NS_USER_TALK ) {
            $user = User::newFromName( $title->getText(), false );
            if ( $user ) {
                $user->setNewtalk( false );
            }
        }

        // Image redirects
        RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
    }

    public static function onArticleEdit( Title $title, Revision $revision = null ) {
        // Invalidate caches of articles which include this page
        DeferredUpdates::addUpdate( new HTMLCacheUpdate( $title, 'templatelinks' ) );

        // Invalidate the caches of all pages which redirect here
        DeferredUpdates::addUpdate( new HTMLCacheUpdate( $title, 'redirect' ) );

        // Purge CDN for this page only
        $title->purgeSquid();
        // Clear file cache for this page only
        HTMLFileCache::clearFileCache( $title );

        $revid = $revision ? $revision->getId() : null;
        DeferredUpdates::addCallableUpdate( function() use ( $title, $revid ) {
            InfoAction::invalidateCache( $title, $revid );
        } );
    }

    public function getCategories() {
        $id = $this->getId();
        if ( $id == 0 ) {
            return TitleArray::newFromResult( new FakeResultWrapper( [] ) );
        }

        $dbr = wfGetDB( DB_SLAVE );
        $res = $dbr->select( 'categorylinks',
            [ 'cl_to AS page_title, ' . NS_CATEGORY . ' AS page_namespace' ],
            // Have to do that since DatabaseBase::fieldNamesWithAlias treats numeric indexes
            // as not being aliases, and NS_CATEGORY is numeric
            [ 'cl_from' => $id ],
            __METHOD__ );

        return TitleArray::newFromResult( $res );
    }

    public function getHiddenCategories() {
        $result = [];
        $id = $this->getId();

        if ( $id == 0 ) {
            return [];
        }

        $dbr = wfGetDB( DB_SLAVE );
        $res = $dbr->select( [ 'categorylinks', 'page_props', 'page' ],
            [ 'cl_to' ],
            [ 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
                'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ],
            __METHOD__ );

        if ( $res !== false ) {
            foreach ( $res as $row ) {
                $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
            }
        }

        return $result;
    }

    public static function getAutosummary( $oldtext, $newtext, $flags ) {
        // NOTE: stub for backwards-compatibility. assumes the given text is
        // wikitext. will break horribly if it isn't.

        ContentHandler::deprecated( __METHOD__, '1.21' );

        $handler = ContentHandler::getForModelID( CONTENT_MODEL_WIKITEXT );
        $oldContent = is_null( $oldtext ) ? null : $handler->unserializeContent( $oldtext );
        $newContent = is_null( $newtext ) ? null : $handler->unserializeContent( $newtext );

        return $handler->getAutosummary( $oldContent, $newContent, $flags );
    }

    public function getAutoDeleteReason( &$hasHistory ) {
        return $this->getContentHandler()->getAutoDeleteReason( $this->getTitle(), $hasHistory );
    }

    public function updateCategoryCounts( array $added, array $deleted ) {
        $that = $this;
        $method = __METHOD__;
        $dbw = wfGetDB( DB_MASTER );

        // Do this at the end of the commit to reduce lock wait timeouts
        $dbw->onTransactionPreCommitOrIdle(
            function () use ( $dbw, $that, $method, $added, $deleted ) {
                $ns = $that->getTitle()->getNamespace();

                $addFields = [ 'cat_pages = cat_pages + 1' ];
                $removeFields = [ 'cat_pages = cat_pages - 1' ];
                if ( $ns == NS_CATEGORY ) {
                    $addFields[] = 'cat_subcats = cat_subcats + 1';
                    $removeFields[] = 'cat_subcats = cat_subcats - 1';
                } elseif ( $ns == NS_FILE ) {
                    $addFields[] = 'cat_files = cat_files + 1';
                    $removeFields[] = 'cat_files = cat_files - 1';
                }

                if ( count( $added ) ) {
                    $existingAdded = $dbw->selectFieldValues(
                        'category',
                        'cat_title',
                        [ 'cat_title' => $added ],
                        __METHOD__
                    );

                    // For category rows that already exist, do a plain
                    // UPDATE instead of INSERT...ON DUPLICATE KEY UPDATE
                    // to avoid creating gaps in the cat_id sequence.
                    if ( count( $existingAdded ) ) {
                        $dbw->update(
                            'category',
                            $addFields,
                            [ 'cat_title' => $existingAdded ],
                            __METHOD__
                        );
                    }

                    $missingAdded = array_diff( $added, $existingAdded );
                    if ( count( $missingAdded ) ) {
                        $insertRows = [];
                        foreach ( $missingAdded as $cat ) {
                            $insertRows[] = [
                                'cat_title'   => $cat,
                                'cat_pages'   => 1,
                                'cat_subcats' => ( $ns == NS_CATEGORY ) ? 1 : 0,
                                'cat_files'   => ( $ns == NS_FILE ) ? 1 : 0,
                            ];
                        }
                        $dbw->upsert(
                            'category',
                            $insertRows,
                            [ 'cat_title' ],
                            $addFields,
                            $method
                        );
                    }
                }

                if ( count( $deleted ) ) {
                    $dbw->update(
                        'category',
                        $removeFields,
                        [ 'cat_title' => $deleted ],
                        $method
                    );
                }

                foreach ( $added as $catName ) {
                    $cat = Category::newFromName( $catName );
                    Hooks::run( 'CategoryAfterPageAdded', [ $cat, $that ] );
                }

                foreach ( $deleted as $catName ) {
                    $cat = Category::newFromName( $catName );
                    Hooks::run( 'CategoryAfterPageRemoved', [ $cat, $that ] );
                }
            }
        );
    }

    public function triggerOpportunisticLinksUpdate( ParserOutput $parserOutput ) {
        if ( wfReadOnly() ) {
            return;
        }

        if ( !Hooks::run( 'OpportunisticLinksUpdate',
            [ $this, $this->mTitle, $parserOutput ]
        ) ) {
            return;
        }

        $config = RequestContext::getMain()->getConfig();

        $params = [
            'isOpportunistic' => true,
            'rootJobTimestamp' => $parserOutput->getCacheTime()
        ];

        if ( $this->mTitle->areRestrictionsCascading() ) {
            // If the page is cascade protecting, the links should really be up-to-date
            JobQueueGroup::singleton()->lazyPush(
                RefreshLinksJob::newPrioritized( $this->mTitle, $params )
            );
        } elseif ( !$config->get( 'MiserMode' ) && $parserOutput->hasDynamicContent() ) {
            // Assume the output contains "dynamic" time/random based magic words.
            // Only update pages that expired due to dynamic content and NOT due to edits
            // to referenced templates/files. When the cache expires due to dynamic content,
            // page_touched is unchanged. We want to avoid triggering redundant jobs due to
            // views of pages that were just purged via HTMLCacheUpdateJob. In that case, the
            // template/file edit already triggered recursive RefreshLinksJob jobs.
            if ( $this->getLinksTimestamp() > $this->getTouched() ) {
                // If a page is uncacheable, do not keep spamming a job for it.
                // Although it would be de-duplicated, it would still waste I/O.
                $cache = ObjectCache::getLocalClusterInstance();
                $key = $cache->makeKey( 'dynamic-linksupdate', 'last', $this->getId() );
                $ttl = max( $parserOutput->getCacheExpiry(), 3600 );
                if ( $cache->add( $key, time(), $ttl ) ) {
                    JobQueueGroup::singleton()->lazyPush(
                        RefreshLinksJob::newDynamic( $this->mTitle, $params )
                    );
                }
            }
        }
    }

    public function getDeletionUpdates( Content $content = null ) {
        if ( !$content ) {
            // load content object, which may be used to determine the necessary updates.
            // XXX: the content may not be needed to determine the updates.
            $content = $this->getContent( Revision::RAW );
        }

        if ( !$content ) {
            $updates = [];
        } else {
            $updates = $content->getDeletionUpdates( $this );
        }

        Hooks::run( 'WikiPageDeletionUpdates', [ $this, $content, &$updates ] );
        return $updates;
    }
}