Article.php
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Article.php
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	<?php
	/**
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License along
	* with this program; if not, write to the Free Software Foundation, Inc.,
	* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
	* http://www.gnu.org/copyleft/gpl.html
	*
	* @file
	*/

	use MediaWiki\Block\DatabaseBlock;
	use MediaWiki\Block\DatabaseBlockStore;
	use MediaWiki\CommentFormatter\CommentFormatter;
	use MediaWiki\Context\IContextSource;
	use MediaWiki\Context\RequestContext;
	use MediaWiki\EditPage\EditPage;
	use MediaWiki\HookContainer\HookRunner;
	use MediaWiki\HookContainer\ProtectedHookAccessorTrait;
	use MediaWiki\Html\Html;
	use MediaWiki\Language\Language;
	use MediaWiki\Linker\Linker;
	use MediaWiki\Linker\LinkRenderer;
	use MediaWiki\MainConfigNames;
	use MediaWiki\MediaWikiServices;
	use MediaWiki\Message\Message;
	use MediaWiki\Output\OutputPage;
	use MediaWiki\Page\ParserOutputAccess;
	use MediaWiki\Page\ProtectionForm;
	use MediaWiki\Page\WikiPageFactory;
	use MediaWiki\Parser\Parser;
	use MediaWiki\Parser\ParserOptions;
	use MediaWiki\Parser\ParserOutput;
	use MediaWiki\Permissions\Authority;
	use MediaWiki\Permissions\PermissionStatus;
	use MediaWiki\Permissions\RestrictionStore;
	use MediaWiki\Revision\ArchivedRevisionLookup;
	use MediaWiki\Revision\BadRevisionException;
	use MediaWiki\Revision\RevisionRecord;
	use MediaWiki\Revision\RevisionStore;
	use MediaWiki\Revision\SlotRecord;
	use MediaWiki\Status\Status;
	use MediaWiki\Title\Title;
	use MediaWiki\User\Options\UserOptionsLookup;
	use MediaWiki\User\User;
	use MediaWiki\User\UserIdentity;
	use MediaWiki\User\UserNameUtils;
	use MediaWiki\Xml\Xml;
	use Wikimedia\IPUtils;
	use Wikimedia\LightweightObjectStore\ExpirationAwareness;
	use Wikimedia\NonSerializable\NonSerializableTrait;
	use Wikimedia\Rdbms\IConnectionProvider;

	/**
	* Legacy class representing an editable page and handling UI for some page actions.
	*
	* This has largely been superseded by WikiPage, with Action subclasses for the
	* user interface of page actions, and service classes for their backend logic.
	*
	* @todo Move and refactor remaining code
	* @todo Deprecate
	*/
	class Article implements Page {
	use ProtectedHookAccessorTrait;
	use NonSerializableTrait;

	/**
	* @var IContextSource\|null The context this Article is executed in.
	* If null, RequestContext::getMain() is used.
	* @deprecated since 1.35, must be private, use {@link getContext}
	*/
	protected $mContext;

	/** @var WikiPage The WikiPage object of this instance */
	protected $mPage;

	/**
	* @var int\|null The oldid of the article that was requested to be shown,
	* 0 for the current revision.
	*/
	public $mOldId;

	/** @var Title\|null Title from which we were redirected here, if any. */
	public $mRedirectedFrom = null;

	/** @var string\|false URL to redirect to or false if none */
	public $mRedirectUrl = false;

	/**
	* @var Status\|null represents the outcome of fetchRevisionRecord().
	* $fetchResult->value is the RevisionRecord object, if the operation was successful.
	*/
	private $fetchResult = null;

	/**
	* @var ParserOutput\|null\|false The ParserOutput generated for viewing the page,
	* initialized by view(). If no ParserOutput could be generated, this is set to false.
	* @deprecated since 1.32
	*/
	public $mParserOutput = null;

	/**
	* @var bool Whether render() was called. With the way subclasses work
	* here, there doesn't seem to be any other way to stop calling
	* OutputPage::enableSectionEditLinks() and still have it work as it did before.
	*/
	protected $viewIsRenderAction = false;

	protected LinkRenderer $linkRenderer;
	private RevisionStore $revisionStore;
	private UserNameUtils $userNameUtils;
	private UserOptionsLookup $userOptionsLookup;
	private CommentFormatter $commentFormatter;
	private WikiPageFactory $wikiPageFactory;
	private JobQueueGroup $jobQueueGroup;
	private ArchivedRevisionLookup $archivedRevisionLookup;
	protected IConnectionProvider $dbProvider;
	protected DatabaseBlockStore $blockStore;

	protected RestrictionStore $restrictionStore;

	/**
	* @var RevisionRecord\|null Revision to be shown
	*
	* Initialized by getOldIDFromRequest() or fetchRevisionRecord(). While the output of
	* Article::view is typically based on this revision, it may be replaced by extensions.
	*/
	private $mRevisionRecord = null;

	/**
	* @param Title $title
	* @param int\|null $oldId Revision ID, null to fetch from request, zero for current
	*/
	public function __construct( Title $title, $oldId = null ) {
	$this->mOldId = $oldId;
	$this->mPage = $this->newPage( $title );

	$services = MediaWikiServices::getInstance();
	$this->linkRenderer = $services->getLinkRenderer();
	$this->revisionStore = $services->getRevisionStore();
	$this->userNameUtils = $services->getUserNameUtils();
	$this->userOptionsLookup = $services->getUserOptionsLookup();
	$this->commentFormatter = $services->getCommentFormatter();
	$this->wikiPageFactory = $services->getWikiPageFactory();
	$this->jobQueueGroup = $services->getJobQueueGroup();
	$this->archivedRevisionLookup = $services->getArchivedRevisionLookup();
	$this->dbProvider = $services->getConnectionProvider();
	$this->blockStore = $services->getDatabaseBlockStore();
	$this->restrictionStore = $services->getRestrictionStore();
	}

	/**
	* @param Title $title
	* @return WikiPage
	*/
	protected function newPage( Title $title ) {
	return new WikiPage( $title );
	}

	/**
	* Constructor from a page id
	* @param int $id Article ID to load
	* @return Article\|null
	*/
	public static function newFromID( $id ) {
	$t = Title::newFromID( $id );
	return $t === null ? null : new static( $t );
	}

	/**
	* Create an Article object of the appropriate class for the given page.
	*
	* @param Title $title
	* @param IContextSource $context
	* @return Article
	*/
	public static function newFromTitle( $title, IContextSource $context ): self {
	if ( $title->getNamespace() === NS_MEDIA ) {
	// XXX: This should not be here, but where should it go?
	$title = Title::makeTitle( NS_FILE, $title->getDBkey() );
	}

	$page = null;
	( new HookRunner( MediaWikiServices::getInstance()->getHookContainer() ) )
	// @phan-suppress-next-line PhanTypeMismatchArgument Type mismatch on pass-by-ref args
	->onArticleFromTitle( $title, $page, $context );
	if ( !$page ) {
	switch ( $title->getNamespace() ) {
	case NS_FILE:
	$page = new ImagePage( $title );
	break;
	case NS_CATEGORY:
	$page = new CategoryPage( $title );
	break;
	default:
	$page = new Article( $title );
	}
	}
	$page->setContext( $context );

	return $page;
	}

	/**
	* Create an Article object of the appropriate class for the given page.
	*
	* @param WikiPage $page
	* @param IContextSource $context
	* @return Article
	*/
	public static function newFromWikiPage( WikiPage $page, IContextSource $context ) {
	$article = self::newFromTitle( $page->getTitle(), $context );
	$article->mPage = $page; // override to keep process cached vars
	return $article;
	}

	/**
	* Get the page this view was redirected from
	* @return Title\|null
	* @since 1.28
	*/
	public function getRedirectedFrom() {
	return $this->mRedirectedFrom;
	}

	/**
	* Tell the page view functions that this view was redirected
	* from another page on the wiki.
	* @param Title $from
	*/
	public function setRedirectedFrom( Title $from ) {
	$this->mRedirectedFrom = $from;
	}

	/**
	* Get the title object of the article
	*
	* @return Title Title object of this page
	*/
	public function getTitle() {
	return $this->mPage->getTitle();
	}

	/**
	* Get the WikiPage object of this instance
	*
	* @since 1.19
	* @return WikiPage
	*/
	public function getPage() {
	return $this->mPage;
	}

	public function clear() {
	$this->mRedirectedFrom = null; # Title object if set
	$this->mRedirectUrl = false;
	$this->mRevisionRecord = null;
	$this->fetchResult = null;

	// TODO hard-deprecate direct access to public fields

	$this->mPage->clear();
	}

	/**
	* @see getOldIDFromRequest()
	* @see getRevIdFetched()
	*
	* @return int The oldid of the article that is was requested in the constructor or via the
	* context's WebRequest.
	*/
	public function getOldID() {
	if ( $this->mOldId === null ) {
	$this->mOldId = $this->getOldIDFromRequest();
	}

	return $this->mOldId;
	}

	/**
	* Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
	*
	* @return int The old id for the request
	*/
	public function getOldIDFromRequest() {
	$this->mRedirectUrl = false;

	$request = $this->getContext()->getRequest();
	$oldid = $request->getIntOrNull( 'oldid' );

	if ( $oldid === null ) {
	return 0;
	}

	if ( $oldid !== 0 ) {
	# Load the given revision and check whether the page is another one.
	# In that case, update this instance to reflect the change.
	if ( $oldid === $this->mPage->getLatest() ) {
	$this->mRevisionRecord = $this->mPage->getRevisionRecord();
	} else {
	$this->mRevisionRecord = $this->revisionStore->getRevisionById( $oldid );
	if ( $this->mRevisionRecord !== null ) {
	$revPageId = $this->mRevisionRecord->getPageId();
	// Revision title doesn't match the page title given?
	if ( $this->mPage->getId() !== $revPageId ) {
	$this->mPage = $this->wikiPageFactory->newFromID( $revPageId );
	}
	}
	}
	}

	$oldRev = $this->mRevisionRecord;
	if ( $request->getRawVal( 'direction' ) === 'next' ) {
	$nextid = 0;
	if ( $oldRev ) {
	$nextRev = $this->revisionStore->getNextRevision( $oldRev );
	if ( $nextRev ) {
	$nextid = $nextRev->getId();
	}
	}
	if ( $nextid ) {
	$oldid = $nextid;
	$this->mRevisionRecord = null;
	} else {
	$this->mRedirectUrl = $this->getTitle()->getFullURL( 'redirect=no' );
	}
	} elseif ( $request->getRawVal( 'direction' ) === 'prev' ) {
	$previd = 0;
	if ( $oldRev ) {
	$prevRev = $this->revisionStore->getPreviousRevision( $oldRev );
	if ( $prevRev ) {
	$previd = $prevRev->getId();
	}
	}
	if ( $previd ) {
	$oldid = $previd;
	$this->mRevisionRecord = null;
	}
	}

	return $oldid;
	}

	/**
	* Fetches the revision to work on.
	* The revision is loaded from the database. Refer to $this->fetchResult for the revision
	* or any errors encountered while loading it.
	*
	* Public since 1.35
	*
	* @return RevisionRecord\|null
	*/
	public function fetchRevisionRecord() {
	if ( $this->fetchResult ) {
	return $this->mRevisionRecord;
	}

	$oldid = $this->getOldID();

	// $this->mRevisionRecord might already be fetched by getOldIDFromRequest()
	if ( !$this->mRevisionRecord ) {
	if ( !$oldid ) {
	$this->mRevisionRecord = $this->mPage->getRevisionRecord();

	if ( !$this->mRevisionRecord ) {
	wfDebug( __METHOD__ . " failed to find page data for title " .
	$this->getTitle()->getPrefixedText() );

	// Output for this case is done by showMissingArticle().
	$this->fetchResult = Status::newFatal( 'noarticletext' );
	return null;
	}
	} else {
	$this->mRevisionRecord = $this->revisionStore->getRevisionById( $oldid );

	if ( !$this->mRevisionRecord ) {
	wfDebug( __METHOD__ . " failed to load revision, rev_id $oldid" );

	$this->fetchResult = Status::newFatal( $this->getMissingRevisionMsg( $oldid ) );
	return null;
	}
	}
	}

	if ( !$this->mRevisionRecord->userCan( RevisionRecord::DELETED_TEXT, $this->getContext()->getAuthority() ) ) {
	wfDebug( __METHOD__ . " failed to retrieve content of revision " . $this->mRevisionRecord->getId() );

	// Output for this case is done by showDeletedRevisionHeader().
	// title used in wikilinks, should not contain whitespaces
	$this->fetchResult = new Status;
	$title = $this->getTitle()->getPrefixedDBkey();

	if ( $this->mRevisionRecord->isDeleted( RevisionRecord::DELETED_RESTRICTED ) ) {
	$this->fetchResult->fatal( 'rev-suppressed-text' );
	} else {
	$this->fetchResult->fatal( 'rev-deleted-text-permission', $title );
	}

	return null;
	}

	$this->fetchResult = Status::newGood( $this->mRevisionRecord );
	return $this->mRevisionRecord;
	}

	/**
	* Returns true if the currently-referenced revision is the current edit
	* to this page (and it exists).
	* @return bool
	*/
	public function isCurrent() {
	# If no oldid, this is the current version.
	if ( $this->getOldID() == 0 ) {
	return true;
	}

	return $this->mPage->exists() &&
	$this->mRevisionRecord &&
	$this->mRevisionRecord->isCurrent();
	}

	/**
	* Use this to fetch the rev ID used on page views
	*
	* Before fetchRevisionRecord was called, this returns the page's latest revision,
	* regardless of what getOldID() returns.
	*
	* @return int Revision ID of last article revision
	*/
	public function getRevIdFetched() {
	if ( $this->fetchResult && $this->fetchResult->isOK() ) {
	/** @var RevisionRecord $rev */
	$rev = $this->fetchResult->getValue();
	return $rev->getId();
	} else {
	return $this->mPage->getLatest();
	}
	}

	/**
	* This is the default action of the index.php entry point: just view the
	* page of the given title.
	*/
	public function view() {
	$context = $this->getContext();
	$useFileCache = $context->getConfig()->get( MainConfigNames::UseFileCache );

	# Get variables from query string
	# As side effect this will load the revision and update the title
	# in a revision ID is passed in the request, so this should remain
	# the first call of this method even if $oldid is used way below.
	$oldid = $this->getOldID();

	$authority = $context->getAuthority();
	# Another check in case getOldID() is altering the title
	$permissionStatus = PermissionStatus::newEmpty();
	if ( !$authority
	->authorizeRead( 'read', $this->getTitle(), $permissionStatus )
	) {
	wfDebug( __METHOD__ . ": denied on secondary read check" );
	throw new PermissionsError( 'read', $permissionStatus );
	}

	$outputPage = $context->getOutput();
	# getOldID() may as well want us to redirect somewhere else
	if ( $this->mRedirectUrl ) {
	$outputPage->redirect( $this->mRedirectUrl );
	wfDebug( __METHOD__ . ": redirecting due to oldid" );

	return;
	}

	# If we got diff in the query, we want to see a diff page instead of the article.
	if ( $context->getRequest()->getCheck( 'diff' ) ) {
	wfDebug( __METHOD__ . ": showing diff page" );
	$this->showDiffPage();

	return;
	}

	$this->showProtectionIndicator();

	# Set page title (may be overridden from ParserOutput if title conversion is enabled or DISPLAYTITLE is used)
	$outputPage->setPageTitle( Parser::formatPageTitle(
	str_replace( '_', ' ', $this->getTitle()->getNsText() ),
	':',
	$this->getTitle()->getText()
	) );

	$outputPage->setArticleFlag( true );
	# Allow frames by default
	$outputPage->getMetadata()->setPreventClickjacking( false );

	$parserOptions = $this->getParserOptions();

	$poOptions = [];
	# Allow extensions to vary parser options used for article rendering
	( new HookRunner( MediaWikiServices::getInstance()->getHookContainer() ) )
	->onArticleParserOptions( $this, $parserOptions );
	# Render printable version, use printable version cache
	if ( $outputPage->isPrintable() ) {
	$parserOptions->setIsPrintable( true );
	$poOptions['enableSectionEditLinks'] = false;
	$outputPage->prependHTML(
	Html::warningBox(
	$outputPage->msg( 'printableversion-deprecated-warning' )->escaped()
	)
	);
	} elseif ( $this->viewIsRenderAction \|\| !$this->isCurrent() \|\|
	!$authority->probablyCan( 'edit', $this->getTitle() )
	) {
	$poOptions['enableSectionEditLinks'] = false;
	}

	# Try client and file cache
	if ( $oldid === 0 && $this->mPage->checkTouched() ) {
	# Try to stream the output from file cache
	if ( $useFileCache && $this->tryFileCache() ) {
	wfDebug( __METHOD__ . ": done file cache" );
	# tell wgOut that output is taken care of
	$outputPage->disable();
	$this->mPage->doViewUpdates( $authority, $oldid );

	return;
	}
	}

	$this->showRedirectedFromHeader();
	$this->showNamespaceHeader();

	if ( $this->viewIsRenderAction ) {
	$poOptions += [ 'absoluteURLs' => true ];
	}
	$poOptions += [ 'includeDebugInfo' => true ];

	try {
	$continue =
	$this->generateContentOutput( $authority, $parserOptions, $oldid, $outputPage, $poOptions );
	} catch ( BadRevisionException $e ) {
	$continue = false;
	$this->showViewError( wfMessage( 'badrevision' )->text() );
	}

	if ( !$continue ) {
	return;
	}

	# For the main page, overwrite the <title> element with the con-
	# tents of 'pagetitle-view-mainpage' instead of the default (if
	# that's not empty).
	# This message always exists because it is in the i18n files
	if ( $this->getTitle()->isMainPage() ) {
	$msg = $context->msg( 'pagetitle-view-mainpage' )->inContentLanguage();
	if ( !$msg->isDisabled() ) {
	$outputPage->setHTMLTitle( $msg->text() );
	}
	}

	# Use adaptive TTLs for CDN so delayed/failed purges are noticed less often.
	# This could use getTouched(), but that could be scary for major template edits.
	$outputPage->adaptCdnTTL( $this->mPage->getTimestamp(), ExpirationAwareness::TTL_DAY );

	$this->showViewFooter();
	$this->mPage->doViewUpdates( $authority, $oldid, $this->fetchRevisionRecord() );

	# Load the postEdit module if the user just saved this revision
	# See also EditPage::setPostEditCookie
	$request = $context->getRequest();
	$cookieKey = EditPage::POST_EDIT_COOKIE_KEY_PREFIX . $this->getRevIdFetched();
	$postEdit = $request->getCookie( $cookieKey );
	if ( $postEdit ) {
	# Clear the cookie. This also prevents caching of the response.
	$request->response()->clearCookie( $cookieKey );
	$outputPage->addJsConfigVars( 'wgPostEdit', $postEdit );
	$outputPage->addModules( 'mediawiki.action.view.postEdit' ); // FIXME: test this
	if ( $this->getContext()->getConfig()->get( MainConfigNames::EnableEditRecovery )
	&& $this->userOptionsLookup->getOption( $this->getContext()->getUser(), 'editrecovery' )
	) {
	$outputPage->addModules( 'mediawiki.editRecovery.postEdit' );
	}
	}
	}

	/**
	* Show a lock icon above the article body if the page is protected.
	*/
	public function showProtectionIndicator(): void {
	$title = $this->getTitle();
	$context = $this->getContext();
	$outputPage = $context->getOutput();

	$protectionIndicatorsAreEnabled = $context->getConfig()
	->get( MainConfigNames::EnableProtectionIndicators );

	if ( !$protectionIndicatorsAreEnabled \|\| $title->isMainPage() ) {
	return;
	}

	$protection = $this->restrictionStore->getRestrictions( $title, 'edit' );

	$cascadeProtection = $this->restrictionStore->getCascadeProtectionSources( $title )[1];

	$isCascadeProtected = array_key_exists( 'edit', $cascadeProtection );

	if ( !$protection && !$isCascadeProtected ) {
	return;
	}

	if ( $isCascadeProtected ) {
	// Cascade-protected pages are protected at the sysop level. So it
	// should not matter if we take the protection level of the first
	// or last page that is being cascaded to the current page.
	$protectionLevel = $cascadeProtection['edit'][0];
	} else {
	$protectionLevel = $protection[0];
	}

	// Protection levels are stored in the database as plain text, but
	// they are expected to be valid protection levels. So we should be able to
	// safely use them. However phan thinks this could be a XSS problem so we
	// are being paranoid and escaping them once more.
	$protectionLevel = htmlspecialchars( $protectionLevel );

	$protectionExpiry = $this->restrictionStore->getRestrictionExpiry( $title, 'edit' );
	$formattedProtectionExpiry = $context->getLanguage()
	->formatExpiry( $protectionExpiry ?? '' );

	$protectionMsg = 'protection-indicator-title';
	if ( $protectionExpiry === 'infinity' \|\| !$protectionExpiry ) {
	$protectionMsg .= '-infinity';
	}

	// Potential values: 'protection-sysop', 'protection-autoconfirmed',
	// 'protection-sysop-cascade' etc.
	// If the wiki has more protection levels, the additional ids that get
	// added take the form 'protection-<protectionLevel>' and
	// 'protection-<protectionLevel>-cascade'.
	$protectionIndicatorId = 'protection-' . $protectionLevel;
	$protectionIndicatorId .= ( $isCascadeProtected ? '-cascade' : '' );

	// Messages 'protection-indicator-title', 'protection-indicator-title-infinity'
	$protectionMsg = $outputPage->msg( $protectionMsg, $protectionLevel, $formattedProtectionExpiry )->text();

	// Use a trick similar to the one used in Action::addHelpLink() to allow wikis
	// to customize where the help link points to.
	$protectionHelpLink = $outputPage->msg( $protectionIndicatorId . '-helppage' );
	if ( $protectionHelpLink->isDisabled() ) {
	$protectionHelpLink = 'https://mediawiki.org/wiki/Special:MyLanguage/Help:Protection';
	} else {
	$protectionHelpLink = $protectionHelpLink->text();
	}

	$outputPage->setIndicators( [
	$protectionIndicatorId => Html::rawElement( 'a', [
	'class' => 'mw-protection-indicator-icon--lock',
	'title' => $protectionMsg,
	'href' => $protectionHelpLink
	],
	// Screen reader-only text describing the same thing as
	// was mentioned in the title attribute.
	Html::element( 'span', [], $protectionMsg ) )
	] );

	$outputPage->addModuleStyles( 'mediawiki.protectionIndicators.styles' );
	}

	/**
	* Determines the desired ParserOutput and passes it to $outputPage.
	*
	* @param Authority $performer
	* @param ParserOptions $parserOptions
	* @param int $oldid
	* @param OutputPage $outputPage
	* @param array $textOptions
	*
	* @return bool True if further processing like footer generation should be applied,
	* false to skip further processing.
	*/
	private function generateContentOutput(
	Authority $performer,
	ParserOptions $parserOptions,
	int $oldid,
	OutputPage $outputPage,
	array $textOptions
	): bool {
	# Should the parser cache be used?
	$useParserCache = true;
	$pOutput = null;
	$parserOutputAccess = MediaWikiServices::getInstance()->getParserOutputAccess();

	// NOTE: $outputDone and $useParserCache may be changed by the hook
	$this->getHookRunner()->onArticleViewHeader( $this, $outputDone, $useParserCache );
	if ( $outputDone ) {
	if ( $outputDone instanceof ParserOutput ) {
	$pOutput = $outputDone;
	}

	if ( $pOutput ) {
	$this->doOutputMetaData( $pOutput, $outputPage );
	}
	return true;
	}

	// Early abort if the page doesn't exist
	if ( !$this->mPage->exists() ) {
	wfDebug( __METHOD__ . ": showing missing article" );
	$this->showMissingArticle();
	$this->mPage->doViewUpdates( $performer );
	return false; // skip all further output to OutputPage
	}

	// Try the latest parser cache
	// NOTE: try latest-revision cache first to avoid loading revision.
	if ( $useParserCache && !$oldid ) {
	$pOutput = $parserOutputAccess->getCachedParserOutput(
	$this->getPage(),
	$parserOptions,
	null,
	ParserOutputAccess::OPT_NO_AUDIENCE_CHECK // we already checked
	);

	if ( $pOutput ) {
	$this->doOutputFromParserCache( $pOutput, $outputPage, $textOptions );
	$this->doOutputMetaData( $pOutput, $outputPage );
	return true;
	}
	}

	$rev = $this->fetchRevisionRecord();
	if ( !$this->fetchResult->isOK() ) {
	$this->showViewError( $this->fetchResult->getWikiText(
	false, false, $this->getContext()->getLanguage()
	) );
	return true;
	}

	# Are we looking at an old revision
	if ( $oldid ) {
	$this->setOldSubtitle( $oldid );

	if ( !$this->showDeletedRevisionHeader() ) {
	wfDebug( __METHOD__ . ": cannot view deleted revision" );
	return false; // skip all further output to OutputPage
	}

	// Try the old revision parser cache
	// NOTE: Repeating cache check for old revision to avoid fetching $rev
	// before it's absolutely necessary.
	if ( $useParserCache ) {
	$pOutput = $parserOutputAccess->getCachedParserOutput(
	$this->getPage(),
	$parserOptions,
	$rev,
	ParserOutputAccess::OPT_NO_AUDIENCE_CHECK // we already checked in fetchRevisionRecord
	);

	if ( $pOutput ) {
	$this->doOutputFromParserCache( $pOutput, $outputPage, $textOptions );
	$this->doOutputMetaData( $pOutput, $outputPage );
	return true;
	}
	}
	}

	# Ensure that UI elements requiring revision ID have
	# the correct version information. (This may be overwritten after creation of ParserOutput)
	$outputPage->setRevisionId( $this->getRevIdFetched() );
	$outputPage->setRevisionIsCurrent( $rev->isCurrent() );
	# Preload timestamp to avoid a DB hit
	$outputPage->setRevisionTimestamp( $rev->getTimestamp() );

	# Pages containing custom CSS or JavaScript get special treatment
	if ( $this->getTitle()->isSiteConfigPage() \|\| $this->getTitle()->isUserConfigPage() ) {
	$dir = $this->getContext()->getLanguage()->getDir();
	$lang = $this->getContext()->getLanguage()->getHtmlCode();

	$outputPage->wrapWikiMsg(
	"<div id='mw-clearyourcache' lang='$lang' dir='$dir' class='mw-content-$dir'>\n$1\n</div>",
	'clearyourcache'
	);
	$outputPage->addModuleStyles( 'mediawiki.action.styles' );
	} elseif ( !$this->getHookRunner()->onArticleRevisionViewCustom(
	$rev,
	$this->getTitle(),
	$oldid,
	$outputPage )
	) {
	// NOTE: sync with hooks called in DifferenceEngine::renderNewRevision()
	// Allow extensions do their own custom view for certain pages
	$this->doOutputMetaData( $pOutput, $outputPage );
	return true;
	}

	# Run the parse, protected by a pool counter
	wfDebug( __METHOD__ . ": doing uncached parse" );

	$opt = 0;

	// we already checked the cache in case 2, don't check again.
	$opt \|= ParserOutputAccess::OPT_NO_CHECK_CACHE;

	// we already checked in fetchRevisionRecord()
	$opt \|= ParserOutputAccess::OPT_NO_AUDIENCE_CHECK;

	// enable stampede protection and allow stale content
	$opt \|= ParserOutputAccess::OPT_FOR_ARTICLE_VIEW;

	// Attempt to trigger WikiPage::triggerOpportunisticLinksUpdate
	// Ideally this should not be the responsibility of the ParserCache to control this.
	// See https://phabricator.wikimedia.org/T329842#8816557 for more context.
	$opt \|= ParserOutputAccess::OPT_LINKS_UPDATE;

	if ( !$rev->getId() \|\| !$useParserCache ) {
	// fake revision or uncacheable options
	$opt \|= ParserOutputAccess::OPT_NO_CACHE;
	}

	$renderStatus = $parserOutputAccess->getParserOutput(
	$this->getPage(),
	$parserOptions,
	$rev,
	$opt
	);

	// T327164: If parsoid cache warming is enabled, we want to ensure that the page
	// the user is currently looking at has a cached parsoid rendering, in case they
	// open visual editor. The cache entry would typically be missing if it has expired
	// from the cache or it was invalidated by RefreshLinksJob. When "traditional"
	// parser output has been invalidated by RefreshLinksJob, we will render it on
	// the fly when a user requests the page, and thereby populate the cache again,
	// per the code above.
	// The code below is intended to do the same for parsoid output, but asynchronously
	// in a job, so the user does not have to wait.
	// Note that we get here if the traditional parser output was missing from the cache.
	// We do not check if the parsoid output is present in the cache, because that check
	// takes time. The assumption is that if we have traditional parser output
	// cached, we probably also have parsoid output cached.
	// So we leave it to ParsoidCachePrewarmJob to determine whether or not parsing is
	// needed.
	if ( $oldid === 0 \|\| $oldid === $this->getPage()->getLatest() ) {
	$parsoidCacheWarmingEnabled = $this->getContext()->getConfig()
	->get( MainConfigNames::ParsoidCacheConfig )['WarmParsoidParserCache'];

	if ( $parsoidCacheWarmingEnabled ) {
	$parsoidJobSpec = ParsoidCachePrewarmJob::newSpec(
	$rev->getId(),
	$this->getPage()->toPageRecord(),
	[ 'causeAction' => 'view' ]
	);
	$this->jobQueueGroup->lazyPush( $parsoidJobSpec );
	}
	}

	$this->doOutputFromRenderStatus(
	$rev,
	$renderStatus,
	$outputPage,
	$textOptions
	);

	if ( !$renderStatus->isOK() ) {
	return true;
	}

	$pOutput = $renderStatus->getValue();
	$this->doOutputMetaData( $pOutput, $outputPage );
	return true;
	}

	/**
	* @param ?ParserOutput $pOutput
	* @param OutputPage $outputPage
	*/
	private function doOutputMetaData( ?ParserOutput $pOutput, OutputPage $outputPage ) {
	# Adjust title for main page & pages with displaytitle
	if ( $pOutput ) {
	$this->adjustDisplayTitle( $pOutput );

	// It would be nice to automatically set this during the first call
	// to OutputPage::addParserOutputMetadata, but we can't because doing
	// so would break non-pageview actions where OutputPage::getContLangForJS
	// has different requirements.
	$pageLang = $pOutput->getLanguage();
	if ( $pageLang ) {
	$outputPage->setContentLangForJS( $pageLang );
	}
	}

	# Check for any __NOINDEX__ tags on the page using $pOutput
	$policy = $this->getRobotPolicy( 'view', $pOutput ?: null );
	$outputPage->getMetadata()->setIndexPolicy( $policy['index'] );
	$outputPage->setFollowPolicy( $policy['follow'] ); // FIXME: test this

	$this->mParserOutput = $pOutput;
	}

	/**
	* @param ParserOutput $pOutput
	* @param OutputPage $outputPage
	* @param array $textOptions
	*/
	private function doOutputFromParserCache(
	ParserOutput $pOutput,
	OutputPage $outputPage,
	array $textOptions
	) {
	# Ensure that UI elements requiring revision ID have
	# the correct version information.
	$oldid = $pOutput->getCacheRevisionId() ?? $this->getRevIdFetched();
	$outputPage->setRevisionId( $oldid );
	$outputPage->setRevisionIsCurrent( $oldid === $this->mPage->getLatest() );
	$outputPage->addParserOutput( $pOutput, $textOptions );
	# Preload timestamp to avoid a DB hit
	$cachedTimestamp = $pOutput->getRevisionTimestamp();
	if ( $cachedTimestamp !== null ) {
	$outputPage->setRevisionTimestamp( $cachedTimestamp );
	$this->mPage->setTimestamp( $cachedTimestamp );
	}
	}

	/**
	* @param RevisionRecord $rev
	* @param Status $renderStatus
	* @param OutputPage $outputPage
	* @param array $textOptions
	*/
	private function doOutputFromRenderStatus(
	RevisionRecord $rev,
	Status $renderStatus,
	OutputPage $outputPage,
	array $textOptions
	) {
	$context = $this->getContext();
	if ( !$renderStatus->isOK() ) {
	$this->showViewError( $renderStatus->getWikiText(
	false, 'view-pool-error', $context->getLanguage()
	) );
	return;
	}

	$pOutput = $renderStatus->getValue();

	// Cache stale ParserOutput object with a short expiry
	if ( $renderStatus->hasMessage( 'view-pool-dirty-output' ) ) {
	$outputPage->lowerCdnMaxage( $context->getConfig()->get( MainConfigNames::CdnMaxageStale ) );
	$outputPage->setLastModified( $pOutput->getCacheTime() );
	$staleReason = $renderStatus->hasMessage( 'view-pool-contention' )
	? $context->msg( 'view-pool-contention' )->escaped()
	: $context->msg( 'view-pool-timeout' )->escaped();
	$outputPage->addHTML( "<!-- parser cache is expired, " .
	"sending anyway due to $staleReason-->\n" );

	// Ensure OutputPage knowns the id from the dirty cache, but keep the current flag (T341013)
	$cachedId = $pOutput->getCacheRevisionId();
	if ( $cachedId !== null ) {
	$outputPage->setRevisionId( $cachedId );
	$outputPage->setRevisionTimestamp( $pOutput->getTimestamp() );
	}
	}

	$outputPage->addParserOutput( $pOutput, $textOptions );

	if ( $this->getRevisionRedirectTarget( $rev ) ) {
	$outputPage->addSubtitle( "<span id=\"redirectsub\">" .
	$context->msg( 'redirectpagesub' )->parse() . "</span>" );
	}
	}

	/**
	* @param RevisionRecord $revision
	* @return null\|Title
	*/
	private function getRevisionRedirectTarget( RevisionRecord $revision ) {
	// TODO: find a good place for the code that determines the redirect target for
	// a given revision!
	// NOTE: Use main slot content. Compare code in DerivedPageDataUpdater::revisionIsRedirect.
	$content = $revision->getContent( SlotRecord::MAIN );
	return $content ? $content->getRedirectTarget() : null;
	}

	/**
	* Adjust title for pages with displaytitle, -{T\|}- or language conversion
	* @param ParserOutput $pOutput
	*/
	public function adjustDisplayTitle( ParserOutput $pOutput ) {
	$out = $this->getContext()->getOutput();

	# Adjust the title if it was set by displaytitle, -{T\|}- or language conversion
	$titleText = $pOutput->getTitleText();
	if ( strval( $titleText ) !== '' ) {
	$out->setPageTitle( $titleText );
	$out->setDisplayTitle( $titleText );
	}
	}

	/**
	* Show a diff page according to current request variables. For use within
	* Article::view() only, other callers should use the DifferenceEngine class.
	*/
	protected function showDiffPage() {
	$context = $this->getContext();
	$outputPage = $context->getOutput();
	$outputPage->addBodyClasses( 'mw-article-diff' );
	$request = $context->getRequest();
	$diff = $request->getVal( 'diff' );
	$rcid = $request->getInt( 'rcid' );
	$purge = $request->getRawVal( 'action' ) === 'purge';
	$unhide = $request->getInt( 'unhide' ) === 1;
	$oldid = $this->getOldID();

	$rev = $this->fetchRevisionRecord();

	if ( !$rev ) {
	// T213621: $rev maybe null due to either lack of permission to view the
	// revision or actually not existing. So let's try loading it from the id
	$rev = $this->revisionStore->getRevisionById( $oldid );
	if ( $rev ) {
	// Revision exists but $user lacks permission to diff it.
	// Do nothing here.
	// The $rev will later be used to create standard diff elements however.
	} else {
	$outputPage->setPageTitleMsg( $context->msg( 'errorpagetitle' ) );
	$msg = $context->msg( 'difference-missing-revision' )
	->params( $oldid )
	->numParams( 1 )
	->parseAsBlock();
	$outputPage->addHTML( $msg );
	return;
	}
	}

	$services = MediaWikiServices::getInstance();

	$contentHandler = $services
	->getContentHandlerFactory()
	->getContentHandler(
	$rev->getSlot( SlotRecord::MAIN, RevisionRecord::RAW )->getModel()
	);
	$de = $contentHandler->createDifferenceEngine(
	$context,
	$oldid,
	$diff,
	$rcid,
	$purge,
	$unhide
	);

	$diffType = $request->getVal( 'diff-type' );

	if ( $diffType === null ) {
	$diffType = $this->userOptionsLookup
	->getOption( $context->getUser(), 'diff-type' );
	} else {
	$de->setExtraQueryParams( [ 'diff-type' => $diffType ] );
	}

	$de->setSlotDiffOptions( [
	'diff-type' => $diffType,
	'expand-url' => $this->viewIsRenderAction,
	'inline-toggle' => true,
	] );
	$de->showDiffPage( $this->isDiffOnlyView() );

	// Run view updates for the newer revision being diffed (and shown
	// below the diff if not diffOnly).
	[ , $new ] = $de->mapDiffPrevNext( $oldid, $diff );
	// New can be false, convert it to 0 - this conveniently means the latest revision
	$this->mPage->doViewUpdates( $context->getAuthority(), (int)$new );

	// Add link to help page; see T321569
	$context->getOutput()->addHelpLink( 'Help:Diff' );
	}

	protected function isDiffOnlyView() {
	return $this->getContext()->getRequest()->getBool(
	'diffonly',
	$this->userOptionsLookup->getBoolOption( $this->getContext()->getUser(), 'diffonly' )
	);
	}

	/**
	* Get the robot policy to be used for the current view
	* @param string $action The action= GET parameter
	* @param ParserOutput\|null $pOutput
	* @return string[] The policy that should be set
	* @todo actions other than 'view'
	*/
	public function getRobotPolicy( $action, ?ParserOutput $pOutput = null ) {
	$context = $this->getContext();
	$mainConfig = $context->getConfig();
	$articleRobotPolicies = $mainConfig->get( MainConfigNames::ArticleRobotPolicies );
	$namespaceRobotPolicies = $mainConfig->get( MainConfigNames::NamespaceRobotPolicies );
	$defaultRobotPolicy = $mainConfig->get( MainConfigNames::DefaultRobotPolicy );
	$title = $this->getTitle();
	$ns = $title->getNamespace();

	# Don't index user and user talk pages for blocked users (T13443)
	if ( $ns === NS_USER \|\| $ns === NS_USER_TALK ) {
	$specificTarget = null;
	$vagueTarget = null;
	$titleText = $title->getText();
	if ( IPUtils::isValid( $titleText ) ) {
	$vagueTarget = $titleText;
	} else {
	$specificTarget = $title->getRootText();
	}
	if ( $this->blockStore->newFromTarget( $specificTarget, $vagueTarget ) instanceof DatabaseBlock ) {
	return [
	'index' => 'noindex',
	'follow' => 'nofollow'
	];
	}
	}

	if ( $this->mPage->getId() === 0 \|\| $this->getOldID() ) {
	# Non-articles (special pages etc), and old revisions
	return [
	'index' => 'noindex',
	'follow' => 'nofollow'
	];
	} elseif ( $context->getOutput()->isPrintable() ) {
	# Discourage indexing of printable versions, but encourage following
	return [
	'index' => 'noindex',
	'follow' => 'follow'
	];
	} elseif ( $context->getRequest()->getInt( 'curid' ) ) {
	# For ?curid=x urls, disallow indexing
	return [
	'index' => 'noindex',
	'follow' => 'follow'
	];
	}

	# Otherwise, construct the policy based on the various config variables.
	$policy = self::formatRobotPolicy( $defaultRobotPolicy );

	if ( isset( $namespaceRobotPolicies[$ns] ) ) {
	# Honour customised robot policies for this namespace
	$policy = array_merge(
	$policy,
	self::formatRobotPolicy( $namespaceRobotPolicies[$ns] )
	);
	}
	if ( $title->canUseNoindex() && $pOutput && $pOutput->getIndexPolicy() ) {
	# __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
	# a final check that we have really got the parser output.
	$policy = array_merge(
	$policy,
	[ 'index' => $pOutput->getIndexPolicy() ]
	);
	}

	if ( isset( $articleRobotPolicies[$title->getPrefixedText()] ) ) {
	# (T16900) site config can override user-defined __INDEX__ or __NOINDEX__
	$policy = array_merge(
	$policy,
	self::formatRobotPolicy( $articleRobotPolicies[$title->getPrefixedText()] )
	);
	}

	return $policy;
	}

	/**
	* Converts a String robot policy into an associative array, to allow
	* merging of several policies using array_merge().
	* @param array\|string $policy Returns empty array on null/false/'', transparent
	* to already-converted arrays, converts string.
	* @return array 'index' => \<indexpolicy\>, 'follow' => \<followpolicy\>
	*/
	public static function formatRobotPolicy( $policy ) {
	if ( is_array( $policy ) ) {
	return $policy;
	} elseif ( !$policy ) {
	return [];
	}

	$arr = [];
	foreach ( explode( ',', $policy ) as $var ) {
	$var = trim( $var );
	if ( $var === 'index' \|\| $var === 'noindex' ) {
	$arr['index'] = $var;
	} elseif ( $var === 'follow' \|\| $var === 'nofollow' ) {
	$arr['follow'] = $var;
	}
	}

	return $arr;
	}

	/**
	* If this request is a redirect view, send "redirected from" subtitle to
	* the output. Returns true if the header was needed, false if this is not
	* a redirect view. Handles both local and remote redirects.
	*
	* @return bool
	*/
	public function showRedirectedFromHeader() {
	$context = $this->getContext();
	$redirectSources = $context->getConfig()->get( MainConfigNames::RedirectSources );
	$outputPage = $context->getOutput();
	$request = $context->getRequest();
	$rdfrom = $request->getVal( 'rdfrom' );

	// Construct a URL for the current page view, but with the target title
	$query = $request->getValues();
	unset( $query['rdfrom'] );
	unset( $query['title'] );
	if ( $this->getTitle()->isRedirect() ) {
	// Prevent double redirects
	$query['redirect'] = 'no';
	}
	$redirectTargetUrl = $this->getTitle()->getLinkURL( $query );

	if ( isset( $this->mRedirectedFrom ) ) {
	// This is an internally redirected page view.
	// We'll need a backlink to the source page for navigation.
	if ( $this->getHookRunner()->onArticleViewRedirect( $this ) ) {
	$redir = $this->linkRenderer->makeKnownLink(
	$this->mRedirectedFrom,
	null,
	[],
	[ 'redirect' => 'no' ]
	);

	$outputPage->addSubtitle( "<span class=\"mw-redirectedfrom\">" .
	$context->msg( 'redirectedfrom' )->rawParams( $redir )->parse()
	. "</span>" );

	// Add the script to update the displayed URL and
	// set the fragment if one was specified in the redirect
	$outputPage->addJsConfigVars( [
	'wgInternalRedirectTargetUrl' => $redirectTargetUrl,
	] );
	$outputPage->addModules( 'mediawiki.action.view.redirect' );

	// Add a <link rel="canonical"> tag
	$outputPage->setCanonicalUrl( $this->getTitle()->getCanonicalURL() );

	// Tell the output object that the user arrived at this article through a redirect
	$outputPage->setRedirectedFrom( $this->mRedirectedFrom );

	return true;
	}
	} elseif ( $rdfrom ) {
	// This is an externally redirected view, from some other wiki.
	// If it was reported from a trusted site, supply a backlink.
	if ( $redirectSources && preg_match( $redirectSources, $rdfrom ) ) {
	$redir = $this->linkRenderer->makeExternalLink( $rdfrom, $rdfrom, $this->getTitle() );
	$outputPage->addSubtitle( "<span class=\"mw-redirectedfrom\">" .
	$context->msg( 'redirectedfrom' )->rawParams( $redir )->parse()
	. "</span>" );

	// Add the script to update the displayed URL
	$outputPage->addJsConfigVars( [
	'wgInternalRedirectTargetUrl' => $redirectTargetUrl,
	] );
	$outputPage->addModules( 'mediawiki.action.view.redirect' );

	return true;
	}
	}

	return false;
	}

	/**
	* Show a header specific to the namespace currently being viewed, like
	* [[MediaWiki:Talkpagetext]]. For Article::view().
	*/
	public function showNamespaceHeader() {
	if ( $this->getTitle()->isTalkPage() && !$this->getContext()->msg( 'talkpageheader' )->isDisabled() ) {
	$this->getContext()->getOutput()->wrapWikiMsg(
	"<div class=\"mw-talkpageheader\">\n$1\n</div>",
	[ 'talkpageheader' ]
	);
	}
	}

	/**
	* Show the footer section of an ordinary page view
	*/
	public function showViewFooter() {
	# check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
	if ( $this->getTitle()->getNamespace() === NS_USER_TALK
	&& IPUtils::isValid( $this->getTitle()->getText() )
	) {
	$this->getContext()->getOutput()->addWikiMsg( 'anontalkpagetext' );
	}

	// Show a footer allowing the user to patrol the shown revision or page if possible
	$patrolFooterShown = $this->showPatrolFooter();

	$this->getHookRunner()->onArticleViewFooter( $this, $patrolFooterShown );
	}

	/**
	* If patrol is possible, output a patrol UI box. This is called from the
	* footer section of ordinary page views. If patrol is not possible or not
	* desired, does nothing.
	*
	* Side effect: When the patrol link is build, this method will call
	* OutputPage::setPreventClickjacking(true) and load a JS module.
	*
	* @return bool
	*/
	public function showPatrolFooter() {
	$context = $this->getContext();
	$mainConfig = $context->getConfig();
	$useNPPatrol = $mainConfig->get( MainConfigNames::UseNPPatrol );
	$useRCPatrol = $mainConfig->get( MainConfigNames::UseRCPatrol );
	$useFilePatrol = $mainConfig->get( MainConfigNames::UseFilePatrol );
	// Allow hooks to decide whether to not output this at all
	if ( !$this->getHookRunner()->onArticleShowPatrolFooter( $this ) ) {
	return false;
	}

	$outputPage = $context->getOutput();
	$user = $context->getUser();
	$title = $this->getTitle();
	$rc = false;

	if ( !$context->getAuthority()->probablyCan( 'patrol', $title )
	\|\| !( $useRCPatrol \|\| $useNPPatrol
	\|\| ( $useFilePatrol && $title->inNamespace( NS_FILE ) ) )
	) {
	// Patrolling is disabled or the user isn't allowed to
	return false;
	}

	if ( $this->mRevisionRecord
	&& !RecentChange::isInRCLifespan( $this->mRevisionRecord->getTimestamp(), 21600 )
	) {
	// The current revision is already older than what could be in the RC table
	// 6h tolerance because the RC might not be cleaned out regularly
	return false;
	}

	// Check for cached results
	$cache = MediaWikiServices::getInstance()->getMainWANObjectCache();
	$key = $cache->makeKey( 'unpatrollable-page', $title->getArticleID() );
	if ( $cache->get( $key ) ) {
	return false;
	}

	$dbr = $this->dbProvider->getReplicaDatabase();
	$oldestRevisionRow = $dbr->newSelectQueryBuilder()
	->select( [ 'rev_id', 'rev_timestamp' ] )
	->from( 'revision' )
	->where( [ 'rev_page' => $title->getArticleID() ] )
	->orderBy( [ 'rev_timestamp', 'rev_id' ] )
	->caller( __METHOD__ )->fetchRow();
	$oldestRevisionTimestamp = $oldestRevisionRow ? $oldestRevisionRow->rev_timestamp : false;

	// New page patrol: Get the timestamp of the oldest revision which
	// the revision table holds for the given page. Then we look
	// whether it's within the RC lifespan and if it is, we try
	// to get the recentchanges row belonging to that entry.
	$recentPageCreation = false;
	if ( $oldestRevisionTimestamp
	&& RecentChange::isInRCLifespan( $oldestRevisionTimestamp, 21600 )
	) {
	// 6h tolerance because the RC might not be cleaned out regularly
	$recentPageCreation = true;
	$rc = RecentChange::newFromConds(
	[
	'rc_this_oldid' => intval( $oldestRevisionRow->rev_id ),
	// Avoid selecting a categorization entry
	'rc_type' => RC_NEW,
	],
	__METHOD__
	);
	if ( $rc ) {
	// Use generic patrol message for new pages
	$markPatrolledMsg = $context->msg( 'markaspatrolledtext' );
	}
	}

	// File patrol: Get the timestamp of the latest upload for this page,
	// check whether it is within the RC lifespan and if it is, we try
	// to get the recentchanges row belonging to that entry
	// (with rc_type = RC_LOG, rc_log_type = upload).
	$recentFileUpload = false;
	if ( ( !$rc \|\| $rc->getAttribute( 'rc_patrolled' ) ) && $useFilePatrol
	&& $title->getNamespace() === NS_FILE ) {
	// Retrieve timestamp from the current file (lastest upload)
	$newestUploadTimestamp = $dbr->newSelectQueryBuilder()
	->select( 'img_timestamp' )
	->from( 'image' )
	->where( [ 'img_name' => $title->getDBkey() ] )
	->caller( __METHOD__ )->fetchField();
	if ( $newestUploadTimestamp
	&& RecentChange::isInRCLifespan( $newestUploadTimestamp, 21600 )
	) {
	// 6h tolerance because the RC might not be cleaned out regularly
	$recentFileUpload = true;
	$rc = RecentChange::newFromConds(
	[
	'rc_type' => RC_LOG,
	'rc_log_type' => 'upload',
	'rc_timestamp' => $newestUploadTimestamp,
	'rc_namespace' => NS_FILE,
	'rc_cur_id' => $title->getArticleID()
	],
	__METHOD__
	);
	if ( $rc ) {
	// Use patrol message specific to files
	$markPatrolledMsg = $context->msg( 'markaspatrolledtext-file' );
	}
	}
	}

	if ( !$recentPageCreation && !$recentFileUpload ) {
	// Page creation and latest upload (for files) is too old to be in RC

	// We definitely can't patrol so cache the information
	// When a new file version is uploaded, the cache is cleared
	$cache->set( $key, '1' );

	return false;
	}

	if ( !$rc ) {
	// Don't cache: This can be hit if the page gets accessed very fast after
	// its creation / latest upload or in case we have high replica DB lag. In case
	// the revision is too old, we will already return above.
	return false;
	}

	if ( $rc->getAttribute( 'rc_patrolled' ) ) {
	// Patrolled RC entry around

	// Cache the information we gathered above in case we can't patrol
	// Don't cache in case we can patrol as this could change
	$cache->set( $key, '1' );

	return false;
	}

	if ( $rc->getPerformerIdentity()->equals( $user ) ) {
	// Don't show a patrol link for own creations/uploads. If the user could
	// patrol them, they already would be patrolled
	return false;
	}

	$outputPage->getMetadata()->setPreventClickjacking( true );
	$outputPage->addModules( 'mediawiki.misc-authed-curate' );

	$link = $this->linkRenderer->makeKnownLink(
	$title,
	new HtmlArmor( '<button class="cdx-button cdx-button--action-progressive">'
	// @phan-suppress-next-line PhanPossiblyUndeclaredVariable $markPatrolledMsg is always set
	. $markPatrolledMsg->escaped() . '</button>' ),
	[],
	[
	'action' => 'markpatrolled',
	'rcid' => $rc->getAttribute( 'rc_id' ),
	]
	);

	$outputPage->addModuleStyles( 'mediawiki.action.styles' );
	$outputPage->addHTML( "<div class='patrollink' data-mw='interface'>$link</div>" );

	return true;
	}

	/**
	* Purge the cache used to check if it is worth showing the patrol footer
	* For example, it is done during re-uploads when file patrol is used.
	* @param int $articleID ID of the article to purge
	* @since 1.27
	*/
	public static function purgePatrolFooterCache( $articleID ) {
	$cache = MediaWikiServices::getInstance()->getMainWANObjectCache();
	$cache->delete( $cache->makeKey( 'unpatrollable-page', $articleID ) );
	}

	/**
	* Show the error text for a missing article. For articles in the MediaWiki
	* namespace, show the default message text. To be called from Article::view().
	*/
	public function showMissingArticle() {
	$context = $this->getContext();
	$send404Code = $context->getConfig()->get( MainConfigNames::Send404Code );

	$outputPage = $context->getOutput();
	// Whether the page is a root user page of an existing user (but not a subpage)
	$validUserPage = false;

	$title = $this->getTitle();

	$services = MediaWikiServices::getInstance();

	$contextUser = $context->getUser();

	# Show info in user (talk) namespace. Does the user exist? Is he blocked?
	if ( $title->getNamespace() === NS_USER
	\|\| $title->getNamespace() === NS_USER_TALK
	) {
	$rootPart = $title->getRootText();
	$user = User::newFromName( $rootPart, false /* allow IP users */ );
	$ip = $this->userNameUtils->isIP( $rootPart );
	$block = $this->blockStore->newFromTarget( $user, $user );

	if ( $user && $user->isRegistered() && $user->isHidden() &&
	!$context->getAuthority()->isAllowed( 'hideuser' )
	) {
	// T120883 if the user is hidden and the viewer cannot see hidden
	// users, pretend like it does not exist at all.
	$user = false;
	}

	if ( !( $user && $user->isRegistered() ) && !$ip ) {
	// User does not exist
	$outputPage->addHTML( Html::warningBox(
	$context->msg( 'userpage-userdoesnotexist-view', wfEscapeWikiText( $rootPart ) )->parse(),
	'mw-userpage-userdoesnotexist'
	) );

	// Show renameuser log extract
	LogEventsList::showLogExtract(
	$outputPage,
	'renameuser',
	Title::makeTitleSafe( NS_USER, $rootPart ),
	'',
	[
	'lim' => 10,
	'showIfEmpty' => false,
	'msgKey' => [ 'renameuser-renamed-notice', $title->getBaseText() ]
	]
	);
	} elseif (
	$block !== null &&
	$block->getType() != DatabaseBlock::TYPE_AUTO &&
	(
	$block->isSitewide() \|\|
	$services->getPermissionManager()->isBlockedFrom( $user, $title, true )
	)
	) {
	// Show log extract if the user is sitewide blocked or is partially
	// blocked and not allowed to edit their user page or user talk page
	LogEventsList::showLogExtract(
	$outputPage,
	'block',
	$services->getNamespaceInfo()->getCanonicalName( NS_USER ) . ':' .
	$block->getTargetName(),
	'',
	[
	'lim' => 1,
	'showIfEmpty' => false,
	'msgKey' => [
	'blocked-notice-logextract',
	$user->getName() # Support GENDER in notice
	]
	]
	);
	$validUserPage = !$title->isSubpage();
	} else {
	$validUserPage = !$title->isSubpage();
	}
	}

	$this->getHookRunner()->onShowMissingArticle( $this );

	# Show delete and move logs if there were any such events.
	# The logging query can DOS the site when bots/crawlers cause 404 floods,
	# so be careful showing this. 404 pages must be cheap as they are hard to cache.
	$dbCache = MediaWikiServices::getInstance()->getMainObjectStash();
	$key = $dbCache->makeKey( 'page-recent-delete', md5( $title->getPrefixedText() ) );
	$isRegistered = $contextUser->isRegistered();
	$sessionExists = $context->getRequest()->getSession()->isPersistent();

	if ( $isRegistered \|\| $dbCache->get( $key ) \|\| $sessionExists ) {
	$logTypes = [ 'delete', 'move', 'protect', 'merge' ];

	$dbr = $this->dbProvider->getReplicaDatabase();

	$conds = [ $dbr->expr( 'log_action', '!=', 'revision' ) ];
	// Give extensions a chance to hide their (unrelated) log entries
	$this->getHookRunner()->onArticle__MissingArticleConditions( $conds, $logTypes );
	LogEventsList::showLogExtract(
	$outputPage,
	$logTypes,
	$title,
	'',
	[
	'lim' => 10,
	'conds' => $conds,
	'showIfEmpty' => false,
	'msgKey' => [ $isRegistered \|\| $sessionExists
	? 'moveddeleted-notice'
	: 'moveddeleted-notice-recent'
	]
	]
	);
	}

	if ( !$this->mPage->hasViewableContent() && $send404Code && !$validUserPage ) {
	// If there's no backing content, send a 404 Not Found
	// for better machine handling of broken links.
	$context->getRequest()->response()->statusHeader( 404 );
	}

	// Also apply the robot policy for nonexisting pages (even if a 404 was used)
	$policy = $this->getRobotPolicy( 'view' );
	$outputPage->getMetadata()->setIndexPolicy( $policy['index'] );
	$outputPage->setFollowPolicy( $policy['follow'] );

	$hookResult = $this->getHookRunner()->onBeforeDisplayNoArticleText( $this );

	if ( !$hookResult ) {
	return;
	}

	# Show error message
	$oldid = $this->getOldID();
	if ( !$oldid && $title->getNamespace() === NS_MEDIAWIKI && $title->hasSourceText() ) {
	$text = $this->getTitle()->getDefaultMessageText() ?? '';
	$outputPage->addWikiTextAsContent( $text );
	} else {
	if ( $oldid ) {
	$text = $this->getMissingRevisionMsg( $oldid )->plain();
	} elseif ( $context->getAuthority()->probablyCan( 'edit', $title ) ) {
	$message = $isRegistered ? 'noarticletext' : 'noarticletextanon';
	$text = $context->msg( $message )->plain();
	} else {
	$text = $context->msg( 'noarticletext-nopermission' )->plain();
	}

	$dir = $context->getLanguage()->getDir();
	$lang = $context->getLanguage()->getHtmlCode();
	$outputPage->addWikiTextAsInterface( Xml::openElement( 'div', [
	'class' => "noarticletext mw-content-$dir",
	'dir' => $dir,
	'lang' => $lang,
	] ) . "\n$text\n</div>" );
	}
	}

	/**
	* Show error text for errors generated in Article::view().
	* @param string $errortext localized wikitext error message
	*/
	private function showViewError( string $errortext ) {
	$outputPage = $this->getContext()->getOutput();
	$outputPage->setPageTitleMsg( $this->getContext()->msg( 'errorpagetitle' ) );
	$outputPage->disableClientCache();
	$outputPage->setRobotPolicy( 'noindex,nofollow' );
	$outputPage->clearHTML();
	$outputPage->addHTML( Html::errorBox( $outputPage->parseAsContent( $errortext ) ) );
	}

	/**
	* If the revision requested for view is deleted, check permissions.
	* Send either an error message or a warning header to the output.
	*
	* @return bool True if the view is allowed, false if not.
	*/
	public function showDeletedRevisionHeader() {
	if ( !$this->mRevisionRecord->isDeleted( RevisionRecord::DELETED_TEXT ) ) {
	// Not deleted
	return true;
	}
	$outputPage = $this->getContext()->getOutput();
	// Used in wikilinks, should not contain whitespaces
	$titleText = $this->getTitle()->getPrefixedDBkey();
	// If the user is not allowed to see it...
	if ( !$this->mRevisionRecord->userCan(
	RevisionRecord::DELETED_TEXT,
	$this->getContext()->getAuthority()
	) ) {
	$outputPage->addHTML(
	Html::warningBox(
	$outputPage->msg( 'rev-deleted-text-permission', $titleText )->parse(),
	'plainlinks'
	)
	);

	return false;
	// If the user needs to confirm that they want to see it...
	} elseif ( $this->getContext()->getRequest()->getInt( 'unhide' ) !== 1 ) {
	# Give explanation and add a link to view the revision...
	$oldid = intval( $this->getOldID() );
	$link = $this->getTitle()->getFullURL( "oldid={$oldid}&unhide=1" );
	$msg = $this->mRevisionRecord->isDeleted( RevisionRecord::DELETED_RESTRICTED ) ?
	'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
	$outputPage->addHTML(
	Html::warningBox(
	$outputPage->msg( $msg, $link )->parse(),
	'plainlinks'
	)
	);

	return false;
	// We are allowed to see...
	} else {
	$msg = $this->mRevisionRecord->isDeleted( RevisionRecord::DELETED_RESTRICTED )
	? [ 'rev-suppressed-text-view', $titleText ]
	: [ 'rev-deleted-text-view', $titleText ];
	$outputPage->addHTML(
	Html::warningBox(
	$outputPage->msg( $msg[0], $msg[1] )->parse(),
	'plainlinks'
	)
	);

	return true;
	}
	}

	/**
	* Generate the navigation links when browsing through an article revisions
	* It shows the information as:
	* Revision as of \<date\>; view current revision
	* \<- Previous version \| Next Version -\>
	*
	* @param int $oldid Revision ID of this article revision
	*/
	public function setOldSubtitle( $oldid = 0 ) {
	if ( !$this->getHookRunner()->onDisplayOldSubtitle( $this, $oldid ) ) {
	return;
	}

	$context = $this->getContext();
	$unhide = $context->getRequest()->getInt( 'unhide' ) === 1;

	# Cascade unhide param in links for easy deletion browsing
	$extraParams = [];
	if ( $unhide ) {
	$extraParams['unhide'] = 1;
	}

	if ( $this->mRevisionRecord && $this->mRevisionRecord->getId() === $oldid ) {
	$revisionRecord = $this->mRevisionRecord;
	} else {
	$revisionRecord = $this->revisionStore->getRevisionById( $oldid );
	}
	if ( !$revisionRecord ) {
	throw new LogicException( 'There should be a revision record at this point.' );
	}

	$timestamp = $revisionRecord->getTimestamp();

	$current = ( $oldid == $this->mPage->getLatest() );
	$language = $context->getLanguage();
	$user = $context->getUser();

	$td = $language->userTimeAndDate( $timestamp, $user );
	$tddate = $language->userDate( $timestamp, $user );
	$tdtime = $language->userTime( $timestamp, $user );

	# Show user links if allowed to see them. If hidden, then show them only if requested...
	$userlinks = Linker::revUserTools( $revisionRecord, !$unhide );

	$infomsg = $current && !$context->msg( 'revision-info-current' )->isDisabled()
	? 'revision-info-current'
	: 'revision-info';

	$outputPage = $context->getOutput();
	$outputPage->addModuleStyles( [
	'mediawiki.codex.messagebox.styles',
	'mediawiki.action.styles',
	'mediawiki.interface.helpers.styles'
	] );

	$revisionUser = $revisionRecord->getUser();
	$revisionInfo = "<div id=\"mw-{$infomsg}\">" .
	$context->msg( $infomsg, $td )
	->rawParams( $userlinks )
	->params(
	$revisionRecord->getId(),
	$tddate,
	$tdtime,
	$revisionUser ? $revisionUser->getName() : ''
	)
	->rawParams( $this->commentFormatter->formatRevision(
	$revisionRecord,
	$user,
	true,
	!$unhide
	) )
	->parse() .
	"</div>";

	$lnk = $current
	? $context->msg( 'currentrevisionlink' )->escaped()
	: $this->linkRenderer->makeKnownLink(
	$this->getTitle(),
	$context->msg( 'currentrevisionlink' )->text(),
	[],
	$extraParams
	);
	$curdiff = $current
	? $context->msg( 'diff' )->escaped()
	: $this->linkRenderer->makeKnownLink(
	$this->getTitle(),
	$context->msg( 'diff' )->text(),
	[],
	[
	'diff' => 'cur',
	'oldid' => $oldid
	] + $extraParams
	);
	$prevExist = (bool)$this->revisionStore->getPreviousRevision( $revisionRecord );
	$prevlink = $prevExist
	? $this->linkRenderer->makeKnownLink(
	$this->getTitle(),
	$context->msg( 'previousrevision' )->text(),
	[],
	[
	'direction' => 'prev',
	'oldid' => $oldid
	] + $extraParams
	)
	: $context->msg( 'previousrevision' )->escaped();
	$prevdiff = $prevExist
	? $this->linkRenderer->makeKnownLink(
	$this->getTitle(),
	$context->msg( 'diff' )->text(),
	[],
	[
	'diff' => 'prev',
	'oldid' => $oldid
	] + $extraParams
	)
	: $context->msg( 'diff' )->escaped();
	$nextlink = $current
	? $context->msg( 'nextrevision' )->escaped()
	: $this->linkRenderer->makeKnownLink(
	$this->getTitle(),
	$context->msg( 'nextrevision' )->text(),
	[],
	[
	'direction' => 'next',
	'oldid' => $oldid
	] + $extraParams
	);
	$nextdiff = $current
	? $context->msg( 'diff' )->escaped()
	: $this->linkRenderer->makeKnownLink(
	$this->getTitle(),
	$context->msg( 'diff' )->text(),
	[],
	[
	'diff' => 'next',
	'oldid' => $oldid
	] + $extraParams
	);

	$cdel = Linker::getRevDeleteLink(
	$context->getAuthority(),
	$revisionRecord,
	$this->getTitle()
	);
	if ( $cdel !== '' ) {
	$cdel .= ' ';
	}

	// the outer div is need for styling the revision info and nav in MobileFrontend
	$outputPage->addSubtitle(
	Html::warningBox(
	$revisionInfo .
	"<div id=\"mw-revision-nav\">" . $cdel .
	$context->msg( 'revision-nav' )->rawParams(
	$prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff
	)->escaped() . "</div>",
	'mw-revision'
	)
	);
	}

	/**
	* Return the HTML for the top of a redirect page
	*
	* Chances are you should just be using the ParserOutput from
	* WikitextContent::getParserOutput instead of calling this for redirects.
	*
	* @since 1.23
	* @param Language $lang
	* @param Title $target Destination to redirect
	* @param bool $forceKnown Should the image be shown as a bluelink regardless of existence?
	* @return string Containing HTML with redirect link
	* @deprecated since 1.41, use LinkRenderer::makeRedirectHeader() instead
	*/
	public static function getRedirectHeaderHtml( Language $lang, Title $target, $forceKnown = false ) {
	wfDeprecated( __METHOD__, '1.41' );
	$linkRenderer = MediaWikiServices::getInstance()->getLinkRenderer();
	return $linkRenderer->makeRedirectHeader( $lang, $target, $forceKnown );
	}

	/**
	* Adds help link with an icon via page indicators.
	* Link target can be overridden by a local message containing a wikilink:
	* the message key is: 'namespace-' + namespace number + '-helppage'.
	* @param string $to Target MediaWiki.org page title or encoded URL.
	* @param bool $overrideBaseUrl Whether $url is a full URL, to avoid MW.o.
	* @since 1.25
	*/
	public function addHelpLink( $to, $overrideBaseUrl = false ) {
	$out = $this->getContext()->getOutput();
	$msg = $out->msg( 'namespace-' . $this->getTitle()->getNamespace() . '-helppage' );

	if ( !$msg->isDisabled() ) {
	$title = Title::newFromText( $msg->plain() );
	if ( $title instanceof Title ) {
	$out->addHelpLink( $title->getLocalURL(), true );
	}
	} else {
	$out->addHelpLink( $to, $overrideBaseUrl );
	}
	}

	/**
	* Handle action=render
	*/
	public function render() {
	$this->getContext()->getRequest()->response()->header( 'X-Robots-Tag: noindex' );
	$this->getContext()->getOutput()->setArticleBodyOnly( true );
	// We later set 'enableSectionEditLinks=false' based on this; also used by ImagePage
	$this->viewIsRenderAction = true;
	$this->view();
	}

	/**
	* action=protect handler
	*/
	public function protect() {
	$form = new ProtectionForm( $this );
	$form->execute();
	}

	/**
	* action=unprotect handler (alias)
	*/
	public function unprotect() {
	$this->protect();
	}

	/* Caching functions */

	/**
	* checkLastModified returns true if it has taken care of all
	* output to the client that is necessary for this request.
	* (that is, it has sent a cached version of the page)
	*
	* @return bool True if cached version send, false otherwise
	*/
	protected function tryFileCache() {
	static $called = false;

	if ( $called ) {
	wfDebug( "Article::tryFileCache(): called twice!?" );
	return false;
	}

	$called = true;
	if ( $this->isFileCacheable() ) {
	$cache = new HTMLFileCache( $this->getTitle(), 'view' );
	if ( $cache->isCacheGood( $this->mPage->getTouched() ) ) {
	wfDebug( "Article::tryFileCache(): about to load file" );
	$cache->loadFromFileCache( $this->getContext() );
	return true;
	} else {
	wfDebug( "Article::tryFileCache(): starting buffer" );
	ob_start( [ &$cache, 'saveToFileCache' ] );
	}
	} else {
	wfDebug( "Article::tryFileCache(): not cacheable" );
	}

	return false;
	}

	/**
	* Check if the page can be cached
	* @param int $mode One of the HTMLFileCache::MODE_* constants (since 1.28)
	* @return bool
	*/
	public function isFileCacheable( $mode = HTMLFileCache::MODE_NORMAL ) {
	$cacheable = false;

	if ( HTMLFileCache::useFileCache( $this->getContext(), $mode ) ) {
	$cacheable = $this->mPage->getId()
	&& !$this->mRedirectedFrom && !$this->getTitle()->isRedirect();
	// Extension may have reason to disable file caching on some pages.
	if ( $cacheable ) {
	$cacheable = $this->getHookRunner()->onIsFileCacheable( $this ) ?? false;
	}
	}

	return $cacheable;
	}

	/**
	* Lightweight method to get the parser output for a page, checking the parser cache
	* and so on. Doesn't consider most of the stuff that Article::view() is forced to
	* consider, so it's not appropriate to use there.
	*
	* @since 1.16 (r52326) for LiquidThreads
	*
	* @param int\|null $oldid Revision ID or null
	* @param UserIdentity\|null $user The relevant user
	* @return ParserOutput\|false ParserOutput or false if the given revision ID is not found
	*/
	public function getParserOutput( $oldid = null, ?UserIdentity $user = null ) {
	if ( $user === null ) {
	$parserOptions = $this->getParserOptions();
	} else {
	$parserOptions = $this->mPage->makeParserOptions( $user );
	$parserOptions->setRenderReason( 'page-view' );
	}

	return $this->mPage->getParserOutput( $parserOptions, $oldid );
	}

	/**
	* Get parser options suitable for rendering the primary article wikitext
	* @return ParserOptions
	*/
	public function getParserOptions() {
	$parserOptions = $this->mPage->makeParserOptions( $this->getContext() );
	$parserOptions->setRenderReason( 'page-view' );
	return $parserOptions;
	}

	/**
	* Sets the context this Article is executed in
	*
	* @param IContextSource $context
	* @since 1.18
	*/
	public function setContext( $context ) {
	$this->mContext = $context;
	}

	/**
	* Gets the context this Article is executed in
	*
	* @return IContextSource
	* @since 1.18
	*/
	public function getContext(): IContextSource {
	if ( $this->mContext instanceof IContextSource ) {
	return $this->mContext;
	} else {
	wfDebug( __METHOD__ . " called and \$mContext is null. " .
	"Return RequestContext::getMain()" );
	return RequestContext::getMain();
	}
	}

	/**
	* Call to WikiPage function for backwards compatibility.
	* @see ContentHandler::getActionOverrides
	* @return array
	*/
	public function getActionOverrides() {
	return $this->mPage->getActionOverrides();
	}

	private function getMissingRevisionMsg( int $oldid ): Message {
	// T251066: Try loading the revision from the archive table.
	// Show link to view it if it exists and the user has permission to view it.
	// (Ignore the given title, if any; look it up from the revision instead.)
	$context = $this->getContext();
	$revRecord = $this->archivedRevisionLookup->getArchivedRevisionRecord( null, $oldid );
	if (
	$revRecord &&
	$revRecord->userCan(
	RevisionRecord::DELETED_TEXT,
	$context->getAuthority()
	) &&
	$context->getAuthority()->isAllowedAny( 'deletedtext', 'undelete' )
	) {
	return $context->msg(
	'missing-revision-permission',
	$oldid,
	$revRecord->getTimestamp(),
	Title::newFromPageIdentity( $revRecord->getPage() )->getPrefixedDBkey()
	);
	}
	return $context->msg( 'missing-revision', $oldid );
	}
	}

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