Revert "Replace deprecated methods IContextSource::getWikiPage && IContextSource::canUseWikiPage"

This reverts commit ef458e894888d5d984f6b8dcf75cfae008d544d0.

Reason for revert: Causes page tabs to disappear on Special:WhatLinksHere.

Bug: T297744
Change-Id: I0ee282a9f7a5a9b2cfdc3261d800d9e27eaf977e
(cherry picked from commit 93f79a9122e21bac30d7aaa4961ddf76706710db)

12 files changed, 56 insertions, 61 deletions

diff --git a/includes/MediaWiki.php b/includes/MediaWiki.php
index 217e232e7cb9..0c809532e2c4 100644
--- a/includes/MediaWiki.php
+++ b/includes/MediaWiki.php
@@ -409,22 +409,26 @@ class MediaWiki {
 	 * Initialize the main Article object for "standard" actions (view, etc)
 	 * Create an Article object for the page, following redirects if needed.
 	 *
-	 * @throws MWException
 	 * @return Article|string An Article, or a string to redirect to another URL
 	 */
 	private function initializeArticle() {
 		$title = $this->context->getTitle();
 		$services = MediaWikiServices::getInstance();
-		if ( $title !== null && $title->canExist() ) {
-			$wikiPage = $services->getWikiPageFactory()->newFromTitle( $title );
-			$this->context->setWikiPage( $wikiPage );
+		if ( $this->context->canUseWikiPage() ) {
+			// Try to use request context wiki page, as there
+			// is already data from db saved in per process
+			// cache there from this->getAction() call.
+			$page = $this->context->getWikiPage();
 		} else {
-			// This case should not happen.
-			throw new MWException( "This is not an article: '$title'." );
+			// This case should not happen, but just in case.
+			// @TODO: remove this or use an exception
+			$page = $services->getWikiPageFactory()->newFromTitle( $title );
+			$this->context->setWikiPage( $page );
+			wfWarn( "RequestContext::canUseWikiPage() returned false" );
 		}
 
 		// Make GUI wrapper for the WikiPage
-		$article = Article::newFromWikiPage( $wikiPage, $this->context );
+		$article = Article::newFromWikiPage( $page, $this->context );
 
 		// Skip some unnecessary code if the content model doesn't support redirects
 		if ( !$services->getContentHandlerFactory()
@@ -438,8 +442,8 @@ class MediaWiki {
 
 		// Namespace might change when using redirects
 		// Check for redirects ...
-		$action = $request->getVal( 'action', 'view' );
-		$file = ( $wikiPage instanceof WikiFilePage ) ? $wikiPage->getFile() : null;
+		$action = $request->getRawVal( 'action', 'view' );
+		$file = ( $page instanceof WikiFilePage ) ? $page->getFile() : null;
 		if ( ( $action == 'view' || $action == 'render' ) // ... for actions that show content
 			&& !$request->getCheck( 'oldid' ) // ... and are not old revisions
 			&& !$request->getCheck( 'diff' ) // ... and not when showing diff
@@ -881,8 +885,7 @@ class MediaWiki {
 				}
 				// Do any stats increment/watchlist stuff, assuming user is viewing the
 				// latest revision (which should always be the case for file cache)
-				$wikiPage = MediaWikiServices::getInstance()->getWikiPageFactory()->newFromTitle( $title );
-				$wikiPage->doViewUpdates( $this->context->getUser() );
+				$this->context->getWikiPage()->doViewUpdates( $this->context->getUser() );
 				// Tell OutputPage that output is taken care of
 				$output->disable();
 
diff --git a/includes/OutputPage.php b/includes/OutputPage.php
index 94e9dc1bed1a..03ad08125e02 100644
--- a/includes/OutputPage.php
+++ b/includes/OutputPage.php
@@ -3368,9 +3368,10 @@ class OutputPage extends ContextSource {
 			list( $canonicalSpecialPageName, /*...*/ ) =
 				$services->getSpecialPageFactory()->
 					resolveAlias( $title->getDBkey() );
-		} elseif ( $title->canExist() ) {
-			$curRevisionId = $title->getLatestRevID();
-			$articleId = $title->getArticleID();
+		} elseif ( $this->canUseWikiPage() ) {
+			$wikiPage = $this->getWikiPage();
+			$curRevisionId = $wikiPage->getLatest();
+			$articleId = $wikiPage->getId();
 		}
 
 		$lang = $title->getPageViewLanguage();
diff --git a/includes/actions/ActionFactory.php b/includes/actions/ActionFactory.php
index a0a68988834a..c966854607da 100644
--- a/includes/actions/ActionFactory.php
+++ b/includes/actions/ActionFactory.php
@@ -312,8 +312,7 @@ class ActionFactory {
 		// Trying to get a WikiPage for NS_SPECIAL etc. will result
 		// in WikiPageFactory::newFromTitle throwing "Invalid or virtual namespace -1 given."
 		// For SpecialPages et al, default to action=view.
-		$title = $context->getTitle();
-		if ( $title === null || !( $title->canExist() ) ) {
+		if ( !$context->canUseWikiPage() ) {
 			return 'view';
 		}
 
@@ -385,8 +384,7 @@ class ActionFactory {
 	 * @return Article
 	 */
 	protected function getArticle( IContextSource $context ): Article {
-		$title = $context->getTitle();
-		return Article::newFromTitle( $title, $context );
+		return Article::newFromWikiPage( $context->getWikiPage(), $context );
 	}
 
 }
diff --git a/includes/actions/pagers/HistoryPager.php b/includes/actions/pagers/HistoryPager.php
index 33b5f64af667..f3cbb096493d 100644
--- a/includes/actions/pagers/HistoryPager.php
+++ b/includes/actions/pagers/HistoryPager.php
@@ -24,7 +24,6 @@
 use MediaWiki\Cache\LinkBatchFactory;
 use MediaWiki\CommentFormatter\CommentFormatter;
 use MediaWiki\MediaWikiServices;
-use MediaWiki\Page\PageRecord;
 use MediaWiki\Revision\RevisionRecord;
 use MediaWiki\Revision\RevisionStore;
 use MediaWiki\Watchlist\WatchlistManager;
@@ -68,9 +67,6 @@ class HistoryPager extends ReverseChronologicalPager {
 	/** @var CommentFormatter */
 	private $commentFormatter;
 
-	/** @var PageRecord */
-	private $pageRecord;
-
 	/**
 	 * @var RevisionRecord[] Revisions, with the key being their result offset
 	 */
@@ -105,7 +101,6 @@ class HistoryPager extends ReverseChronologicalPager {
 	) {
 		parent::__construct( $historyPage->getContext() );
 		$this->historyPage = $historyPage;
-		$this->pageRecord = $historyPage->getWikiPage();
 		$this->tagFilter = $tagFilter;
 		$this->getDateCond( $year, $month, $day );
 		$this->conds = $conds;
@@ -142,7 +137,7 @@ class HistoryPager extends ReverseChronologicalPager {
 			'tables' => $revQuery['tables'],
 			'fields' => $revQuery['fields'],
 			'conds' => array_merge(
-				[ 'rev_page' => $this->pageRecord->getId() ],
+				[ 'rev_page' => $this->getWikiPage()->getId() ],
 				$this->conds ),
 			'options' => [ 'USE INDEX' => [ 'revision' => $revIndex ] ],
 			'join_conds' => $revQuery['joins'],
@@ -176,7 +171,7 @@ class HistoryPager extends ReverseChronologicalPager {
 
 			$notifTimestamp = $this->getConfig()->get( 'ShowUpdatedMarker' )
 				? $this->watchlistManager
-					->getTitleNotificationTimestamp( $this->getUser(), $this->pageRecord )
+					->getTitleNotificationTimestamp( $this->getUser(), $this->getTitle() )
 				: false;
 
 			$s = $this->historyLine( $this->lastRow, $row, $notifTimestamp,
@@ -198,6 +193,7 @@ class HistoryPager extends ReverseChronologicalPager {
 		# Do a link batch query
 		$batch = $this->linkBatchFactory->newLinkBatch();
 		$revIds = [];
+		$title = $this->getTitle();
 		foreach ( $this->mResult as $row ) {
 			if ( $row->rev_parent_id ) {
 				$revIds[] = (int)$row->rev_parent_id;
@@ -212,7 +208,7 @@ class HistoryPager extends ReverseChronologicalPager {
 			$this->revisions[] = $this->revisionStore->newRevisionFromRow(
 				$row,
 				RevisionStore::READ_NORMAL,
-				$this->pageRecord
+				$title
 			);
 		}
 		$this->parentLens = $this->revisionStore->getRevisionSizes( $revIds );
@@ -333,7 +329,7 @@ class HistoryPager extends ReverseChronologicalPager {
 
 			$notifTimestamp = $this->getConfig()->get( 'ShowUpdatedMarker' )
 				? $this->watchlistManager
-					->getTitleNotificationTimestamp( $this->getUser(), $this->pageRecord )
+					->getTitleNotificationTimestamp( $this->getUser(), $this->getTitle() )
 				: false;
 
 			$s = $this->historyLine( $this->lastRow, $next, $notifTimestamp,
@@ -389,12 +385,13 @@ class HistoryPager extends ReverseChronologicalPager {
 			$previousRevRecord = $this->revisionStore->newRevisionFromRow(
 				$next,
 				RevisionStore::READ_NORMAL,
-				$this->pageRecord
+				$this->getTitle()
 			);
 		} else {
 			$previousRevRecord = null;
 		}
-		$latest = $revRecord->getId() === $this->pageRecord->getLatest();
+
+		$latest = $revRecord->getId() === $this->getWikiPage()->getLatest();
 		$curlink = $this->curLink( $revRecord );
 		$lastlink = $this->lastLink( $revRecord, $next );
 		$curLastlinks = Html::rawElement( 'span', [], $curlink ) .
@@ -487,8 +484,8 @@ class HistoryPager extends ReverseChronologicalPager {
 
 		# Rollback and undo links
 
-		if ( $previousRevRecord && $this->getAuthority()->probablyCan( 'edit', $this->pageRecord ) ) {
-			if ( $latest && $this->getAuthority()->probablyCan( 'rollback', $this->pageRecord )
+		if ( $previousRevRecord && $this->getAuthority()->probablyCan( 'edit', $this->getTitle() ) ) {
+			if ( $latest && $this->getAuthority()->probablyCan( 'rollback', $this->getTitle() )
 			) {
 				// Get a rollback link without the brackets
 				$rollbackLink = Linker::generateRollback(
@@ -510,7 +507,7 @@ class HistoryPager extends ReverseChronologicalPager {
 					? [ 'title' => $this->msg( 'tooltip-undo' )->text() ]
 					: [];
 				$undolink = $this->getLinkRenderer()->makeKnownLink(
-					$this->pageRecord,
+					$this->getTitle(),
 					$this->msg( 'editundo' )->text(),
 					$undoTooltip,
 					[
@@ -588,14 +585,14 @@ class HistoryPager extends ReverseChronologicalPager {
 	 */
 	private function curLink( RevisionRecord $rev ) {
 		$cur = $this->historyPage->message['cur'];
-		$latest = $this->pageRecord->getLatest();
+		$latest = $this->getWikiPage()->getLatest();
 		if ( $latest === $rev->getId()
 			|| !$rev->userCan( RevisionRecord::DELETED_TEXT, $this->getAuthority() )
 		) {
 			return $cur;
 		} else {
 			return $this->getLinkRenderer()->makeKnownLink(
-				$this->pageRecord,
+				$this->getTitle(),
 				new HtmlArmor( $cur ),
 				[],
 				[
@@ -627,7 +624,7 @@ class HistoryPager extends ReverseChronologicalPager {
 		if ( $next === 'unknown' ) {
 			# Next row probably exists but is unknown, use an oldid=prev link
 			return $linkRenderer->makeKnownLink(
-				$this->pageRecord,
+				$this->getTitle(),
 				new HtmlArmor( $last ),
 				[],
 				[
@@ -640,7 +637,7 @@ class HistoryPager extends ReverseChronologicalPager {
 		$nextRev = $this->revisionStore->newRevisionFromRow(
 			$next,
 			RevisionStore::READ_NORMAL,
-			$this->pageRecord
+			$this->getTitle()
 		);
 
 		if ( !$prevRev->userCan( RevisionRecord::DELETED_TEXT, $this->getAuthority() ) ||
@@ -650,7 +647,7 @@ class HistoryPager extends ReverseChronologicalPager {
 		}
 
 		return $linkRenderer->makeKnownLink(
-			$this->pageRecord,
+			$this->getTitle(),
 			new HtmlArmor( $last ),
 			[],
 			[
diff --git a/includes/diff/DifferenceEngine.php b/includes/diff/DifferenceEngine.php
index 88e26d2ff3cf..40cd7e0270f3 100644
--- a/includes/diff/DifferenceEngine.php
+++ b/includes/diff/DifferenceEngine.php
@@ -1012,7 +1012,15 @@ class DifferenceEngine extends ContextSource {
 				// NOTE: sync with hooks called in Article::view()
 			} else {
 				// Normal page
-				$wikiPage = $this->wikiPageFactory->newFromTitle( $this->mNewPage );
+				if ( $this->getTitle()->equals( $this->mNewPage ) ) {
+					// If the Title stored in the context is the same as the one
+					// of the new revision, we can use its associated WikiPage
+					// object.
+					$wikiPage = $this->getWikiPage();
+				} else {
+					// Otherwise we need to create our own WikiPage object
+					$wikiPage = $this->wikiPageFactory->newFromTitle( $this->mNewPage );
+				}
 
 				$parserOutput = $this->getParserOutput( $wikiPage, $this->mNewRevisionRecord );
 
diff --git a/includes/skins/Skin.php b/includes/skins/Skin.php
index 5236dd1db81f..6046de0c7b24 100644
--- a/includes/skins/Skin.php
+++ b/includes/skins/Skin.php
@@ -2529,7 +2529,7 @@ abstract class Skin extends ContextSource {
 
 		/** @var CreditsAction $action */
 		if ( $useCredits ) {
-			$article = Article::newFromTitle( $title, $this );
+			$article = Article::newFromWikiPage( $this->getWikiPage(), $this );
 			$action = Action::factory( 'credits', $article, $this );
 		}
 
diff --git a/includes/skins/SkinTemplate.php b/includes/skins/SkinTemplate.php
index ec4f39a436d4..6ad28196d1d5 100644
--- a/includes/skins/SkinTemplate.php
+++ b/includes/skins/SkinTemplate.php
@@ -1257,12 +1257,8 @@ class SkinTemplate extends Skin {
 					// signal to hide this from simple content_actions
 					$content_navigation['views']['view']['redundant'] = true;
 				}
-				$page = false;
-				$title = $this->getTitle();
-				if ( $title->canExist() ) {
-					$page = MediaWikiServices::getInstance()->getWikiPageFactory()->newFromTitle( $title );
-				}
 
+				$page = $this->canUseWikiPage() ? $this->getWikiPage() : false;
 				$isRemoteContent = $page && !$page->isLocal();
 
 				// If it is a non-local file, show a link to the file in its own repository
diff --git a/includes/specialpage/SpecialPageFactory.php b/includes/specialpage/SpecialPageFactory.php
index 95a53751a1fc..23335efae33d 100644
--- a/includes/specialpage/SpecialPageFactory.php
+++ b/includes/specialpage/SpecialPageFactory.php
@@ -30,7 +30,6 @@ use MediaWiki\Config\ServiceOptions;
 use MediaWiki\HookContainer\HookContainer;
 use MediaWiki\HookContainer\HookRunner;
 use MediaWiki\Linker\LinkRenderer;
-use MediaWiki\MediaWikiServices;
 use MediaWiki\Page\PageReference;
 use Profiler;
 use RequestContext;
@@ -1401,7 +1400,7 @@ class SpecialPageFactory {
 		// phpcs:ignore MediaWiki.Usage.DeprecatedGlobalVariables.Deprecated$wgUser
 		global $wgTitle, $wgOut, $wgRequest, $wgUser, $wgLang;
 		$main = RequestContext::getMain();
-		$title = $main->getTitle();
+
 		// Save current globals and main context
 		$glob = [
 			'title' => $wgTitle,
@@ -1411,16 +1410,14 @@ class SpecialPageFactory {
 			'language' => $wgLang,
 		];
 		$ctx = [
-			'title' => $title,
+			'title' => $main->getTitle(),
 			'output' => $main->getOutput(),
 			'request' => $main->getRequest(),
 			'user' => $main->getUser(),
 			'language' => $main->getLanguage(),
 		];
-
-		if ( $title && $title->canExist() ) {
-			$wikiPage = MediaWikiServices::getInstance()->getWikiPageFactory()->newFromTitle( $title );
-			$ctx['wikipage'] = $wikiPage;
+		if ( $main->canUseWikiPage() ) {
+			$ctx['wikipage'] = $main->getWikiPage();
 		}
 
 		// just needed for $wgTitle and RequestContext::setTitle
diff --git a/tests/phpunit/includes/ExtraParserTest.php b/tests/phpunit/includes/ExtraParserTest.php
index 672b2395411a..6fdff0480c96 100644
--- a/tests/phpunit/includes/ExtraParserTest.php
+++ b/tests/phpunit/includes/ExtraParserTest.php
@@ -62,12 +62,13 @@ class ExtraParserTest extends MediaWikiIntegrationTestCase {
 		$options = ParserOptions::newFromUser( new User() );
 
 		RequestContext::getMain()->setTitle( $title );
+		RequestContext::getMain()->getWikiPage()->CustomTestProp = true;
 
 		$parsed = $this->parser->parse( $text, $title, $options )->getText();
 		$this->assertStringContainsString( 'apihelp-header', $parsed );
 
 		// Verify that this property wasn't wiped out by the parse
-		$this->assertEquals( $title, RequestContext::getMain()->getTitle() );
+		$this->assertTrue( RequestContext::getMain()->getWikiPage()->CustomTestProp );
 	}
 
 	/**
diff --git a/tests/phpunit/includes/actions/ActionTest.php b/tests/phpunit/includes/actions/ActionTest.php
index b7cd67b91a2a..aacea68be9fc 100644
--- a/tests/phpunit/includes/actions/ActionTest.php
+++ b/tests/phpunit/includes/actions/ActionTest.php
@@ -105,7 +105,6 @@ class ActionTest extends MediaWikiIntegrationTestCase {
 		$context = new DerivativeContext( RequestContext::getMain() );
 		$context->setRequest( $request );
 		$context->setWikiPage( $this->getPage() );
-		$context->setTitle( $this->getPage()->getTitle() );
 
 		return $context;
 	}
diff --git a/tests/phpunit/includes/context/RequestContextTest.php b/tests/phpunit/includes/context/RequestContextTest.php
index de249825a206..cb2b9cee582d 100644
--- a/tests/phpunit/includes/context/RequestContextTest.php
+++ b/tests/phpunit/includes/context/RequestContextTest.php
@@ -1,6 +1,5 @@
 <?php
 
-use MediaWiki\MediaWikiServices;
 use MediaWiki\Permissions\UltimateAuthority;
 use MediaWiki\User\UserIdentityValue;
 
@@ -20,8 +19,7 @@ class RequestContextTest extends MediaWikiIntegrationTestCase {
 
 		$curTitle = Title::newFromText( "A" );
 		$context->setTitle( $curTitle );
-		$wikiPage = MediaWikiServices::getInstance()->getWikiPageFactory()->newFromTitle( $context->getTitle() );
-		$this->assertTrue( $curTitle->equals( $wikiPage->getTitle() ),
+		$this->assertTrue( $curTitle->equals( $context->getWikiPage()->getTitle() ),
 			"When a title is first set WikiPage should be created on-demand for that title." );
 
 		$curTitle = Title::newFromText( "B" );
@@ -31,9 +29,8 @@ class RequestContextTest extends MediaWikiIntegrationTestCase {
 
 		$curTitle = Title::newFromText( "C" );
 		$context->setTitle( $curTitle );
-		$wikiPage = MediaWikiServices::getInstance()->getWikiPageFactory()->newFromTitle( $context->getTitle() );
 		$this->assertTrue(
-			$curTitle->equals( $wikiPage->getTitle() ),
+			$curTitle->equals( $context->getWikiPage()->getTitle() ),
 			"When a title is updated the WikiPage should be purged "
 				. "and recreated on-demand with the new title."
 		);
diff --git a/tests/phpunit/unit/includes/actions/ActionFactoryTest.php b/tests/phpunit/unit/includes/actions/ActionFactoryTest.php
index 8eaeef760459..63cfa566d3e7 100644
--- a/tests/phpunit/unit/includes/actions/ActionFactoryTest.php
+++ b/tests/phpunit/unit/includes/actions/ActionFactoryTest.php
@@ -275,9 +275,7 @@ class ActionFactoryTest extends MediaWikiUnitTestCase {
 		array $hooks = []
 	) {
 		$context = $this->createMock( IContextSource::class );
-		$title = $this->createMock( Title::class );
-		$title->method( 'canExist' )->willReturn( true );
-		$context->method( 'getTitle' )->willReturn( $title );
+		$context->method( 'canUseWikiPage' )->willReturn( true );
 
 		$request = new FauxRequest( [
 			'action' => $requestAction,