InfoAction.php

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<?php
use MediaWiki\Cache\LinkBatchFactory;
use MediaWiki\Category\Category;
use MediaWiki\Content\ContentHandler;
use MediaWiki\Context\IContextSource;
use MediaWiki\EditPage\TemplatesOnThisPageFormatter;
use MediaWiki\Html\Html;
use MediaWiki\Language\Language;
use MediaWiki\Languages\LanguageNameUtils;
use MediaWiki\Linker\Linker;
use MediaWiki\Linker\LinkRenderer;
use MediaWiki\Linker\LinksMigration;
use MediaWiki\MainConfigNames;
use MediaWiki\MediaWikiServices;
use MediaWiki\Message\Message;
use MediaWiki\Page\PageIdentity;
use MediaWiki\Page\PageProps;
use MediaWiki\Page\RedirectLookup;
use MediaWiki\Parser\MagicWordFactory;
use MediaWiki\Parser\ParserOutput;
use MediaWiki\Parser\Sanitizer;
use MediaWiki\Permissions\RestrictionStore;
use MediaWiki\Revision\RevisionLookup;
use MediaWiki\Revision\RevisionRecord;
use MediaWiki\SpecialPage\SpecialPage;
use MediaWiki\Title\NamespaceInfo;
use MediaWiki\Title\Title;
use MediaWiki\User\UserFactory;
use MediaWiki\Watchlist\WatchedItemStoreInterface;
use Wikimedia\ObjectCache\WANObjectCache;
use Wikimedia\Rdbms\Database;
use Wikimedia\Rdbms\IConnectionProvider;
use Wikimedia\Rdbms\IDBAccessObject;
use Wikimedia\Rdbms\IExpression;
use Wikimedia\Rdbms\LikeValue;
 
class InfoAction extends FormlessAction {
    private const VERSION = 1;
 
    private Language $contentLanguage;
    private LanguageNameUtils $languageNameUtils;
    private LinkBatchFactory $linkBatchFactory;
    private LinkRenderer $linkRenderer;
    private IConnectionProvider $dbProvider;
    private MagicWordFactory $magicWordFactory;
    private NamespaceInfo $namespaceInfo;
    private PageProps $pageProps;
    private RepoGroup $repoGroup;
    private RevisionLookup $revisionLookup;
    private WANObjectCache $wanObjectCache;
    private WatchedItemStoreInterface $watchedItemStore;
    private RedirectLookup $redirectLookup;
    private RestrictionStore $restrictionStore;
    private LinksMigration $linksMigration;
    private UserFactory $userFactory;
 
    public function __construct(
        Article $article,
        IContextSource $context,
        Language $contentLanguage,
        LanguageNameUtils $languageNameUtils,
        LinkBatchFactory $linkBatchFactory,
        LinkRenderer $linkRenderer,
        IConnectionProvider $dbProvider,
        MagicWordFactory $magicWordFactory,
        NamespaceInfo $namespaceInfo,
        PageProps $pageProps,
        RepoGroup $repoGroup,
        RevisionLookup $revisionLookup,
        WANObjectCache $wanObjectCache,
        WatchedItemStoreInterface $watchedItemStore,
        RedirectLookup $redirectLookup,
        RestrictionStore $restrictionStore,
        LinksMigration $linksMigration,
        UserFactory $userFactory
    ) {
        parent::__construct( $article, $context );
        $this->contentLanguage = $contentLanguage;
        $this->languageNameUtils = $languageNameUtils;
        $this->linkBatchFactory = $linkBatchFactory;
        $this->linkRenderer = $linkRenderer;
        $this->dbProvider = $dbProvider;
        $this->magicWordFactory = $magicWordFactory;
        $this->namespaceInfo = $namespaceInfo;
        $this->pageProps = $pageProps;
        $this->repoGroup = $repoGroup;
        $this->revisionLookup = $revisionLookup;
        $this->wanObjectCache = $wanObjectCache;
        $this->watchedItemStore = $watchedItemStore;
        $this->redirectLookup = $redirectLookup;
        $this->restrictionStore = $restrictionStore;
        $this->linksMigration = $linksMigration;
        $this->userFactory = $userFactory;
    }
 
    public function getName() {
        return 'info';
    }
 
    public function requiresUnblock() {
        return false;
    }
 
    public function requiresWrite() {
        return false;
    }
 
    public static function invalidateCache( PageIdentity $page, $revid = null ) {
        $services = MediaWikiServices::getInstance();
        if ( $revid === null ) {
            $revision = $services->getRevisionLookup()
                ->getRevisionByTitle( $page, 0, IDBAccessObject::READ_LATEST );
            $revid = $revision ? $revision->getId() : 0;
        }
        $cache = $services->getMainWANObjectCache();
        $key = self::getCacheKey( $cache, $page, $revid ?? 0 );
        $cache->delete( $key );
    }
 
    public function onView() {
        $this->getOutput()->addModuleStyles( [
            'mediawiki.interface.helpers.styles',
            'mediawiki.action.styles',
        ] );
 
        // "Help" button
        $this->addHelpLink( 'Page information' );
 
        // Validate revision
        $oldid = $this->getArticle()->getOldID();
        if ( $oldid ) {
            $revRecord = $this->getArticle()->fetchRevisionRecord();
 
            if ( !$revRecord ) {
                return $this->msg( 'missing-revision', $oldid )->parse();
            } elseif ( !$revRecord->isCurrent() ) {
                return $this->msg( 'pageinfo-not-current' )->plain();
            }
        }
 
        // Page header
        $msg = $this->msg( 'pageinfo-header' );
        $content = $msg->isDisabled() ? '' : $msg->parse();
 
        // Get page information
        $pageInfo = $this->pageInfo();
 
        // Allow extensions to add additional information
        $this->getHookRunner()->onInfoAction( $this->getContext(), $pageInfo );
 
        // Render page information
        foreach ( $pageInfo as $header => $infoTable ) {
            // Messages:
            // pageinfo-header-basic, pageinfo-header-edits, pageinfo-header-restrictions,
            // pageinfo-header-properties, pageinfo-category-info
            $content .= $this->makeHeader(
                $this->msg( "pageinfo-$header" )->text(),
                "mw-pageinfo-$header"
            ) . "\n";
            $rows = '';
            $below = "";
            foreach ( $infoTable as $infoRow ) {
                if ( $infoRow[0] == "below" ) {
                    $below = $infoRow[1] . "\n";
                    continue;
                }
                $name = ( $infoRow[0] instanceof Message ) ? $infoRow[0]->escaped() : $infoRow[0];
                $value = ( $infoRow[1] instanceof Message ) ? $infoRow[1]->escaped() : $infoRow[1];
                $id = ( $infoRow[0] instanceof Message ) ? $infoRow[0]->getKey() : null;
                $rows .= $this->getRow( $name, $value, $id ) . "\n";
            }
            if ( $rows !== '' ) {
                $content .= Html::rawElement( 'table', [ 'class' => 'wikitable mw-page-info' ],
                    "\n" . $rows );
            }
            $content .= "\n" . $below;
        }
 
        // Page footer
        if ( !$this->msg( 'pageinfo-footer' )->isDisabled() ) {
            $content .= $this->msg( 'pageinfo-footer' )->parse();
        }
 
        return $content;
    }
 
    private function makeHeader( $header, $canonicalId ) {
        return Html::rawElement(
            'h2',
            [ 'id' => Sanitizer::escapeIdForAttribute( $header ) ],
            Html::element(
                'span',
                [ 'id' => Sanitizer::escapeIdForAttribute( $canonicalId ) ],
                ''
            ) .
            htmlspecialchars( $header )
        );
    }
 
    private function getRow( $name, $value, $id ) {
        return Html::rawElement(
                'tr',
                [
                    'id' => $id === null ? null : 'mw-' . $id,
                    'style' => 'vertical-align: top;',
                ],
                Html::rawElement( 'td', [], $name ) .
                    Html::rawElement( 'td', [], $value )
            );
    }
 
    private function pageInfo() {
        $user = $this->getUser();
        $lang = $this->getLanguage();
        $title = $this->getTitle();
        $id = $title->getArticleID();
        $config = $this->context->getConfig();
        $linkRenderer = $this->linkRenderer;
 
        $pageCounts = $this->pageCounts();
 
        $pageProperties = $this->pageProps->getAllProperties( $title )[$id] ?? [];
 
        // Basic information
        $pageInfo = [];
        $pageInfo['header-basic'] = [];
 
        // Display title
        $displayTitle = $pageProperties['displaytitle'] ??
            htmlspecialchars( $title->getPrefixedText(), ENT_NOQUOTES );
 
        $pageInfo['header-basic'][] = [
            $this->msg( 'pageinfo-display-title' ),
            $displayTitle
        ];
 
        // Is it a redirect? If so, where to?
        $redirectTarget = $this->redirectLookup->getRedirectTarget( $this->getWikiPage() );
        if ( $redirectTarget !== null ) {
            $pageInfo['header-basic'][] = [
                $this->msg( 'pageinfo-redirectsto' ),
                $linkRenderer->makeLink( $redirectTarget ) .
                $this->msg( 'word-separator' )->escaped() .
                $this->msg( 'parentheses' )->rawParams( $linkRenderer->makeLink(
                    $redirectTarget,
                    $this->msg( 'pageinfo-redirectsto-info' )->text(),
                    [],
                    [ 'action' => 'info' ]
                ) )->escaped()
            ];
        }
 
        // Default sort key
        $sortKey = $pageProperties['defaultsort'] ?? $title->getCategorySortkey();
        $pageInfo['header-basic'][] = [
            $this->msg( 'pageinfo-default-sort' ),
            htmlspecialchars( $sortKey )
        ];
 
        // Page length (in bytes)
        $pageInfo['header-basic'][] = [
            $this->msg( 'pageinfo-length' ),
            $lang->formatNum( $title->getLength() )
        ];
 
        // Page namespace
        $pageInfo['header-basic'][] = [ $this->msg( 'pageinfo-namespace-id' ), $title->getNamespace() ];
        $pageNamespace = $title->getNsText();
        if ( $pageNamespace ) {
            $pageInfo['header-basic'][] = [ $this->msg( 'pageinfo-namespace' ), $pageNamespace ];
        }
 
        // Page ID (number not localised, as it's a database ID)
        $pageInfo['header-basic'][] = [ $this->msg( 'pageinfo-article-id' ), $id ];
 
        // Language in which the page content is (supposed to be) written
        $pageLang = $title->getPageLanguage()->getCode();
 
        $pageLangHtml = $pageLang . ' - ' .
            $this->languageNameUtils->getLanguageName( $pageLang, $lang->getCode() );
        // Link to Special:PageLanguage with pre-filled page title if user has permissions
        if ( $config->get( MainConfigNames::PageLanguageUseDB )
            && $this->getAuthority()->probablyCan( 'pagelang', $title )
        ) {
            $pageLangHtml .= $this->msg( 'word-separator' )->escaped();
            $pageLangHtml .= $this->msg( 'parentheses' )->rawParams( $linkRenderer->makeLink(
                SpecialPage::getTitleValueFor( 'PageLanguage', $title->getPrefixedText() ),
                $this->msg( 'pageinfo-language-change' )->text()
            ) )->escaped();
        }
 
        $pageInfo['header-basic'][] = [
            $this->msg( 'pageinfo-language' )->escaped(),
            $pageLangHtml
        ];
 
        // Content model of the page
        $modelHtml = htmlspecialchars( ContentHandler::getLocalizedName( $title->getContentModel() ) );
        // If the user can change it, add a link to Special:ChangeContentModel
        if ( $this->getAuthority()->probablyCan( 'editcontentmodel', $title ) ) {
            $modelHtml .= $this->msg( 'word-separator' )->escaped();
            $modelHtml .= $this->msg( 'parentheses' )->rawParams( $linkRenderer->makeLink(
                SpecialPage::getTitleValueFor( 'ChangeContentModel', $title->getPrefixedText() ),
                $this->msg( 'pageinfo-content-model-change' )->text()
            ) )->escaped();
        }
 
        $pageInfo['header-basic'][] = [
            $this->msg( 'pageinfo-content-model' ),
            $modelHtml
        ];
 
        if ( $title->inNamespace( NS_USER ) ) {
            $pageUser = $this->userFactory->newFromName( $title->getRootText() );
            if ( $pageUser && $pageUser->getId() && !$pageUser->isHidden() ) {
                $pageInfo['header-basic'][] = [
                    $this->msg( 'pageinfo-user-id' ),
                    $pageUser->getId()
                ];
            }
        }
 
        // Search engine status
        $parserOutput = new ParserOutput();
        if ( isset( $pageProperties['noindex'] ) ) {
            $parserOutput->setIndexPolicy( 'noindex' );
        }
        if ( isset( $pageProperties['index'] ) ) {
            $parserOutput->setIndexPolicy( 'index' );
        }
 
        // Use robot policy logic
        $policy = $this->getArticle()->getRobotPolicy( 'view', $parserOutput );
        $pageInfo['header-basic'][] = [
            // Messages: pageinfo-robot-index, pageinfo-robot-noindex
            $this->msg( 'pageinfo-robot-policy' ),
            $this->msg( "pageinfo-robot-{$policy['index']}" )
        ];
 
        $unwatchedPageThreshold = $config->get( MainConfigNames::UnwatchedPageThreshold );
        if ( $this->getAuthority()->isAllowed( 'unwatchedpages' ) ||
            ( $unwatchedPageThreshold !== false &&
                $pageCounts['watchers'] >= $unwatchedPageThreshold )
        ) {
            // Number of page watchers
            $pageInfo['header-basic'][] = [
                $this->msg( 'pageinfo-watchers' ),
                $lang->formatNum( $pageCounts['watchers'] )
            ];
 
            $visiting = $pageCounts['visitingWatchers'] ?? null;
            if ( $visiting !== null && $config->get( MainConfigNames::ShowUpdatedMarker ) ) {
                if ( $visiting > $config->get( MainConfigNames::UnwatchedPageSecret ) ||
                    $this->getAuthority()->isAllowed( 'unwatchedpages' )
                ) {
                    $value = $lang->formatNum( $visiting );
                } else {
                    $value = $this->msg( 'pageinfo-few-visiting-watchers' );
                }
                $pageInfo['header-basic'][] = [
                    $this->msg( 'pageinfo-visiting-watchers' )
                        ->numParams( ceil( $config->get( MainConfigNames::WatchersMaxAge ) / 86400 ) ),
                    $value
                ];
            }
        } elseif ( $unwatchedPageThreshold !== false ) {
            $pageInfo['header-basic'][] = [
                $this->msg( 'pageinfo-watchers' ),
                $this->msg( 'pageinfo-few-watchers' )->numParams( $unwatchedPageThreshold )
            ];
        }
 
        // Redirects to this page
        $whatLinksHere = SpecialPage::getTitleFor( 'Whatlinkshere', $title->getPrefixedText() );
        $pageInfo['header-basic'][] = [
            $linkRenderer->makeLink(
                $whatLinksHere,
                $this->msg( 'pageinfo-redirects-name' )->text(),
                [],
                [
                    'hidelinks' => 1,
                    'hidetrans' => 1,
                    'hideimages' => $title->getNamespace() === NS_FILE
                ]
            ),
            $this->msg( 'pageinfo-redirects-value' )
                ->numParams( count( $title->getRedirectsHere() ) )
        ];
 
        // Is it counted as a content page?
        if ( $this->getWikiPage()->isCountable() ) {
            $pageInfo['header-basic'][] = [
                $this->msg( 'pageinfo-contentpage' ),
                $this->msg( 'pageinfo-contentpage-yes' )
            ];
        }
 
        // Subpages of this page, if subpages are enabled for the current NS
        if ( $this->namespaceInfo->hasSubpages( $title->getNamespace() ) ) {
            $prefixIndex = SpecialPage::getTitleFor(
                'Prefixindex',
                $title->getPrefixedText() . '/'
            );
            $pageInfo['header-basic'][] = [
                $linkRenderer->makeLink(
                    $prefixIndex,
                    $this->msg( 'pageinfo-subpages-name' )->text()
                ),
                // $wgNamespacesWithSubpages can be changed and this can be unset (T340749)
                isset( $pageCounts['subpages'] )
                    ? $this->msg( 'pageinfo-subpages-value' )->numParams(
                        $pageCounts['subpages']['total'],
                        $pageCounts['subpages']['redirects'],
                        $pageCounts['subpages']['nonredirects']
                    ) : $this->msg( 'pageinfo-subpages-value-unknown' )->rawParams(
                        $linkRenderer->makeKnownLink(
                            $title, $this->msg( 'purge' )->text(), [], [ 'action' => 'purge' ] )
                    )
            ];
        }
 
        if ( $title->inNamespace( NS_CATEGORY ) ) {
            $category = Category::newFromTitle( $title );
 
            $allCount = $category->getMemberCount();
            $subcatCount = $category->getSubcatCount();
            $fileCount = $category->getFileCount();
            $pageCount = $category->getPageCount( Category::COUNT_CONTENT_PAGES );
 
            $pageInfo['category-info'] = [
                [
                    $this->msg( 'pageinfo-category-total' ),
                    $lang->formatNum( $allCount )
                ],
                [
                    $this->msg( 'pageinfo-category-pages' ),
                    $lang->formatNum( $pageCount )
                ],
                [
                    $this->msg( 'pageinfo-category-subcats' ),
                    $lang->formatNum( $subcatCount )
                ],
                [
                    $this->msg( 'pageinfo-category-files' ),
                    $lang->formatNum( $fileCount )
                ]
            ];
        }
 
        // Display image SHA-1 value
        if ( $title->inNamespace( NS_FILE ) ) {
            $fileObj = $this->repoGroup->findFile( $title );
            if ( $fileObj !== false ) {
                // Convert the base-36 sha1 value obtained from database to base-16
                $output = Wikimedia\base_convert( $fileObj->getSha1(), 36, 16, 40 );
                $pageInfo['header-basic'][] = [
                    $this->msg( 'pageinfo-file-hash' ),
                    $output
                ];
            }
        }
 
        // Page protection
        $pageInfo['header-restrictions'] = [];
 
        // Is this page affected by the cascading protection of something which includes it?
        if ( $this->restrictionStore->isCascadeProtected( $title ) ) {
            $cascadingFrom = '';
            $sources = $this->restrictionStore->getCascadeProtectionSources( $title )[0];
 
            foreach ( $sources as $sourcePageIdentity ) {
                $cascadingFrom .= Html::rawElement(
                    'li',
                    [],
                    $linkRenderer->makeKnownLink( $sourcePageIdentity )
                );
            }
 
            $cascadingFrom = Html::rawElement( 'ul', [], $cascadingFrom );
            $pageInfo['header-restrictions'][] = [
                $this->msg( 'pageinfo-protect-cascading-from' ),
                $cascadingFrom
            ];
        }
 
        // Is out protection set to cascade to other pages?
        if ( $this->restrictionStore->areRestrictionsCascading( $title ) ) {
            $pageInfo['header-restrictions'][] = [
                $this->msg( 'pageinfo-protect-cascading' ),
                $this->msg( 'pageinfo-protect-cascading-yes' )
            ];
        }
 
        // Page protection
        foreach ( $this->restrictionStore->listApplicableRestrictionTypes( $title ) as $restrictionType ) {
            $protections = $this->restrictionStore->getRestrictions( $title, $restrictionType );
 
            switch ( count( $protections ) ) {
                case 0:
                    $message = $this->getNamespaceProtectionMessage( $title ) ??
                        // Allow all users by default
                        $this->msg( 'protect-default' )->escaped();
                    break;
 
                case 1:
                    // Messages: protect-level-autoconfirmed, protect-level-sysop
                    $message = $this->msg( 'protect-level-' . $protections[0] );
                    if ( !$message->isDisabled() ) {
                        $message = $message->escaped();
                        break;
                    }
                    // Intentional fall-through if message is disabled (or non-existent)
 
                default:
                    // Require "$1" permission
                    $message = $this->msg( "protect-fallback", $lang->commaList( $protections ) )->parse();
                    break;
            }
            $expiry = $this->restrictionStore->getRestrictionExpiry( $title, $restrictionType );
            $formattedexpiry = $expiry === null ? '' : $this->msg(
                'parentheses',
                $lang->formatExpiry( $expiry, true, 'infinity', $user )
            )->escaped();
            $message .= $this->msg( 'word-separator' )->escaped() . $formattedexpiry;
 
            // Messages: restriction-edit, restriction-move, restriction-create,
            // restriction-upload
            $pageInfo['header-restrictions'][] = [
                $this->msg( "restriction-$restrictionType" ), $message
            ];
        }
        $protectLog = SpecialPage::getTitleFor( 'Log' );
        $pageInfo['header-restrictions'][] = [
            'below',
            $linkRenderer->makeKnownLink(
                $protectLog,
                $this->msg( 'pageinfo-view-protect-log' )->text(),
                [],
                [ 'type' => 'protect', 'page' => $title->getPrefixedText() ]
            ),
        ];
 
        if ( !$this->getWikiPage()->exists() ) {
            return $pageInfo;
        }
 
        // Edit history
        $pageInfo['header-edits'] = [];
 
        $firstRev = $this->revisionLookup->getFirstRevision( $this->getTitle() );
        $lastRev = $this->getWikiPage()->getRevisionRecord();
        $batch = $this->linkBatchFactory->newLinkBatch();
        if ( $firstRev ) {
            $firstRevUser = $firstRev->getUser( RevisionRecord::FOR_THIS_USER, $user );
            if ( $firstRevUser ) {
                $batch->add( NS_USER, $firstRevUser->getName() );
                $batch->add( NS_USER_TALK, $firstRevUser->getName() );
            }
        }
 
        if ( $lastRev ) {
            $lastRevUser = $lastRev->getUser( RevisionRecord::FOR_THIS_USER, $user );
            if ( $lastRevUser ) {
                $batch->add( NS_USER, $lastRevUser->getName() );
                $batch->add( NS_USER_TALK, $lastRevUser->getName() );
            }
        }
 
        $batch->execute();
 
        if ( $firstRev ) {
            // Page creator
            $firstRevUser = $firstRev->getUser( RevisionRecord::FOR_THIS_USER, $user );
            // Check if the username is available – it may have been suppressed, in
            // which case use the invalid user name '[HIDDEN]' to get the wiki's
            // default user gender.
            $firstRevUserName = $firstRevUser ? $firstRevUser->getName() : '[HIDDEN]';
            $pageInfo['header-edits'][] = [
                $this->msg( 'pageinfo-firstuser', $firstRevUserName ),
                Linker::revUserTools( $firstRev )
            ];
 
            // Date of page creation
            $pageInfo['header-edits'][] = [
                $this->msg( 'pageinfo-firsttime' ),
                $linkRenderer->makeKnownLink(
                    $title,
                    $lang->userTimeAndDate( $firstRev->getTimestamp(), $user ),
                    [],
                    [ 'oldid' => $firstRev->getId() ]
                )
            ];
        }
 
        if ( $lastRev ) {
            // Latest editor
            $lastRevUser = $lastRev->getUser( RevisionRecord::FOR_THIS_USER, $user );
            // Check if the username is available – it may have been suppressed, in
            // which case use the invalid user name '[HIDDEN]' to get the wiki's
            // default user gender.
            $lastRevUserName = $lastRevUser ? $lastRevUser->getName() : '[HIDDEN]';
            $pageInfo['header-edits'][] = [
                $this->msg( 'pageinfo-lastuser', $lastRevUserName ),
                Linker::revUserTools( $lastRev )
            ];
 
            // Date of latest edit
            $pageInfo['header-edits'][] = [
                $this->msg( 'pageinfo-lasttime' ),
                $linkRenderer->makeKnownLink(
                    $title,
                    $lang->userTimeAndDate( $this->getWikiPage()->getTimestamp(), $user ),
                    [],
                    [ 'oldid' => $this->getWikiPage()->getLatest() ]
                )
            ];
        }
 
        // Total number of edits
        $pageInfo['header-edits'][] = [
            $this->msg( 'pageinfo-edits' ),
            $lang->formatNum( $pageCounts['edits'] )
        ];
 
        // Total number of distinct authors
        if ( $pageCounts['authors'] > 0 ) {
            $pageInfo['header-edits'][] = [
                $this->msg( 'pageinfo-authors' ),
                $lang->formatNum( $pageCounts['authors'] )
            ];
        }
 
        // Recent number of edits (within past 30 days)
        $pageInfo['header-edits'][] = [
            $this->msg(
                'pageinfo-recent-edits',
                $lang->formatDuration( $config->get( MainConfigNames::RCMaxAge ) )
            ),
            $lang->formatNum( $pageCounts['recent_edits'] )
        ];
 
        // Recent number of distinct authors
        $pageInfo['header-edits'][] = [
            $this->msg( 'pageinfo-recent-authors' ),
            $lang->formatNum( $pageCounts['recent_authors'] )
        ];
 
        // Array of magic word IDs
        $wordIDs = $this->magicWordFactory->getDoubleUnderscoreArray()->getNames();
 
        // Array of IDs => localized magic words
        $localizedWords = $this->contentLanguage->getMagicWords();
 
        $listItems = [];
        foreach ( $pageProperties as $property => $value ) {
            if ( in_array( $property, $wordIDs ) ) {
                $listItems[] = Html::element( 'li', [], $localizedWords[$property][1] );
            }
        }
 
        $localizedList = Html::rawElement( 'ul', [], implode( '', $listItems ) );
        $hiddenCategories = $this->getWikiPage()->getHiddenCategories();
 
        if (
            count( $listItems ) > 0 ||
            count( $hiddenCategories ) > 0 ||
            $pageCounts['transclusion']['from'] > 0 ||
            $pageCounts['transclusion']['to'] > 0
        ) {
            $options = [ 'LIMIT' => $config->get( MainConfigNames::PageInfoTransclusionLimit ) ];
            $transcludedTemplates = $title->getTemplateLinksFrom( $options );
            if ( $config->get( MainConfigNames::MiserMode ) ) {
                $transcludedTargets = [];
            } else {
                $transcludedTargets = $title->getTemplateLinksTo( $options );
            }
 
            // Page properties
            $pageInfo['header-properties'] = [];
 
            // Magic words
            if ( count( $listItems ) > 0 ) {
                $pageInfo['header-properties'][] = [
                    $this->msg( 'pageinfo-magic-words' )->numParams( count( $listItems ) ),
                    $localizedList
                ];
            }
 
            // Hidden categories
            if ( count( $hiddenCategories ) > 0 ) {
                $pageInfo['header-properties'][] = [
                    $this->msg( 'pageinfo-hidden-categories' )
                        ->numParams( count( $hiddenCategories ) ),
                    Linker::formatHiddenCategories( $hiddenCategories )
                ];
            }
 
            // Transcluded templates
            if ( $pageCounts['transclusion']['from'] > 0 ) {
                if ( $pageCounts['transclusion']['from'] > count( $transcludedTemplates ) ) {
                    $more = $this->msg( 'morenotlisted' )->escaped();
                } else {
                    $more = null;
                }
 
                $templateListFormatter = new TemplatesOnThisPageFormatter(
                    $this->getContext(),
                    $linkRenderer,
                    $this->linkBatchFactory,
                    $this->restrictionStore
                );
 
                $pageInfo['header-properties'][] = [
                    $this->msg( 'pageinfo-templates' )
                        ->numParams( $pageCounts['transclusion']['from'] ),
                    $templateListFormatter->format( $transcludedTemplates, false, $more )
                ];
            }
 
            if ( !$config->get( MainConfigNames::MiserMode ) && $pageCounts['transclusion']['to'] > 0 ) {
                if ( $pageCounts['transclusion']['to'] > count( $transcludedTargets ) ) {
                    $more = $linkRenderer->makeLink(
                        $whatLinksHere,
                        $this->msg( 'moredotdotdot' )->text(),
                        [],
                        [ 'hidelinks' => 1, 'hideredirs' => 1 ]
                    );
                } else {
                    $more = null;
                }
 
                $templateListFormatter = new TemplatesOnThisPageFormatter(
                    $this->getContext(),
                    $linkRenderer,
                    $this->linkBatchFactory,
                    $this->restrictionStore
                );
 
                $pageInfo['header-properties'][] = [
                    $this->msg( 'pageinfo-transclusions' )
                        ->numParams( $pageCounts['transclusion']['to'] ),
                    $templateListFormatter->format( $transcludedTargets, false, $more )
                ];
            }
        }
 
        return $pageInfo;
    }
 
    private function getNamespaceProtectionMessage( Title $title ): ?string {
        $rights = [];
        if ( $title->isRawHtmlMessage() ) {
            $rights[] = 'editsitecss';
            $rights[] = 'editsitejs';
        } elseif ( $title->isSiteCssConfigPage() ) {
            $rights[] = 'editsitecss';
        } elseif ( $title->isSiteJsConfigPage() ) {
            $rights[] = 'editsitejs';
        } elseif ( $title->isSiteJsonConfigPage() ) {
            $rights[] = 'editsitejson';
        } elseif ( $title->isUserCssConfigPage() ) {
            $rights[] = 'editusercss';
        } elseif ( $title->isUserJsConfigPage() ) {
            $rights[] = 'edituserjs';
        } elseif ( $title->isUserJsonConfigPage() ) {
            $rights[] = 'edituserjson';
        } else {
            $namespaceProtection = $this->context->getConfig()->get( MainConfigNames::NamespaceProtection );
            $right = $namespaceProtection[$title->getNamespace()] ?? null;
            if ( $right ) {
                // a single string as the value is allowed as well as an array
                $rights = (array)$right;
            }
        }
        if ( $rights ) {
            return $this->msg( 'protect-fallback', $this->getLanguage()->commaList( $rights ) )->parse();
        } else {
            return null;
        }
    }
 
    private function pageCounts() {
        $page = $this->getWikiPage();
        $fname = __METHOD__;
        $config = $this->context->getConfig();
        $cache = $this->wanObjectCache;
 
        return $cache->getWithSetCallback(
            self::getCacheKey( $cache, $page->getTitle(), $page->getLatest() ),
            WANObjectCache::TTL_WEEK,
            function ( $oldValue, &$ttl, &$setOpts ) use ( $page, $config, $fname ) {
                $title = $page->getTitle();
                $id = $title->getArticleID();
 
                $dbr = $this->dbProvider->getReplicaDatabase();
                $setOpts += Database::getCacheSetOptions( $dbr );
 
                $field = 'rev_actor';
                $pageField = 'rev_page';
 
                $watchedItemStore = $this->watchedItemStore;
 
                $result = [];
                $result['watchers'] = $watchedItemStore->countWatchers( $title );
 
                if ( $config->get( MainConfigNames::ShowUpdatedMarker ) ) {
                    $updated = (int)wfTimestamp( TS_UNIX, $page->getTimestamp() );
                    $result['visitingWatchers'] = $watchedItemStore->countVisitingWatchers(
                        $title,
                        $updated - $config->get( MainConfigNames::WatchersMaxAge )
                    );
                }
 
                // Total number of edits
                $edits = (int)$dbr->newSelectQueryBuilder()
                    ->select( 'COUNT(*)' )
                    ->from( 'revision' )
                    ->where( [ 'rev_page' => $id ] )
                    ->caller( $fname )
                    ->fetchField();
                $result['edits'] = $edits;
 
                // Total number of distinct authors
                if ( $config->get( MainConfigNames::MiserMode ) ) {
                    $result['authors'] = 0;
                } else {
                    $result['authors'] = (int)$dbr->newSelectQueryBuilder()
                        ->select( "COUNT(DISTINCT $field)" )
                        ->from( 'revision' )
                        ->where( [ $pageField => $id ] )
                        ->caller( $fname )
                        ->fetchField();
                }
 
                // "Recent" threshold defined by RCMaxAge setting
                $threshold = $dbr->timestamp( time() - $config->get( MainConfigNames::RCMaxAge ) );
 
                // Recent number of edits
                $edits = (int)$dbr->newSelectQueryBuilder()
                    ->select( 'COUNT(rev_page)' )
                    ->from( 'revision' )
                    ->where( [ 'rev_page' => $id ] )
                    ->andWhere( $dbr->expr( 'rev_timestamp', '>=', $threshold ) )
                    ->caller( $fname )
                    ->fetchField();
                $result['recent_edits'] = $edits;
 
                // Recent number of distinct authors
                $result['recent_authors'] = (int)$dbr->newSelectQueryBuilder()
                    ->select( "COUNT(DISTINCT $field)" )
                    ->from( 'revision' )
                    ->where( [ $pageField => $id ] )
                    ->andWhere( [ $dbr->expr( 'rev_timestamp', '>=', $threshold ) ] )
                    ->caller( $fname )
                    ->fetchField();
 
                // Subpages (if enabled)
                if ( $this->namespaceInfo->hasSubpages( $title->getNamespace() ) ) {
                    $conds = [ 'page_namespace' => $title->getNamespace() ];
                    $conds[] = $dbr->expr(
                        'page_title',
                        IExpression::LIKE,
                        new LikeValue( $title->getDBkey() . '/', $dbr->anyString() )
                    );
 
                    // Subpages of this page (redirects)
                    $conds['page_is_redirect'] = 1;
                    $result['subpages']['redirects'] = (int)$dbr->newSelectQueryBuilder()
                        ->select( 'COUNT(page_id)' )
                        ->from( 'page' )
                        ->where( $conds )
                        ->caller( $fname )
                        ->fetchField();
                    // Subpages of this page (non-redirects)
                    $conds['page_is_redirect'] = 0;
                    $result['subpages']['nonredirects'] = (int)$dbr->newSelectQueryBuilder()
                        ->select( 'COUNT(page_id)' )
                        ->from( 'page' )
                        ->where( $conds )
                        ->caller( $fname )
                        ->fetchField();
 
                    // Subpages of this page (total)
                    $result['subpages']['total'] = $result['subpages']['redirects']
                        + $result['subpages']['nonredirects'];
                }
 
                // Counts for the number of transclusion links (to/from)
                if ( $config->get( MainConfigNames::MiserMode ) ) {
                    $result['transclusion']['to'] = 0;
                } else {
                    $result['transclusion']['to'] = (int)$dbr->newSelectQueryBuilder()
                        ->select( 'COUNT(tl_from)' )
                        ->from( 'templatelinks' )
                        ->where( $this->linksMigration->getLinksConditions( 'templatelinks', $title ) )
                        ->caller( $fname )
                        ->fetchField();
                }
 
                $result['transclusion']['from'] = (int)$dbr->newSelectQueryBuilder()
                    ->select( 'COUNT(*)' )
                    ->from( 'templatelinks' )
                    ->where( [ 'tl_from' => $title->getArticleID() ] )
                    ->caller( $fname )
                    ->fetchField();
 
                return $result;
            }
        );
    }
 
    protected function getPageTitle() {
        return $this->msg( 'pageinfo-title' )->plaintextParams( $this->getTitle()->getPrefixedText() );
    }
 
    protected function getDescription() {
        return '';
    }
 
    protected static function getCacheKey( WANObjectCache $cache, PageIdentity $page, $revId ) {
        return $cache->makeKey( 'infoaction', md5( (string)$page ), $revId, self::VERSION );
    }
}