Skin.php

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<?php
namespace MediaWiki\Skin;
 
use MediaWiki\Block\Block;
use MediaWiki\Context\ContextSource;
use MediaWiki\HookContainer\ProtectedHookAccessorTrait;
use MediaWiki\Html\Html;
use MediaWiki\Language\Language;
use MediaWiki\Language\LanguageCode;
use MediaWiki\MainConfigNames;
use MediaWiki\MediaWikiServices;
use MediaWiki\Output\OutputPage;
use MediaWiki\Parser\Sanitizer;
use MediaWiki\ResourceLoader as RL;
use MediaWiki\Revision\RevisionStore;
use MediaWiki\Skin\Components\SkinComponent;
use MediaWiki\Skin\Components\SkinComponentEmailConfirmationBanner;
use MediaWiki\Skin\Components\SkinComponentFooter;
use MediaWiki\Skin\Components\SkinComponentLink;
use MediaWiki\Skin\Components\SkinComponentListItem;
use MediaWiki\Skin\Components\SkinComponentMenu;
use MediaWiki\Skin\Components\SkinComponentRegistry;
use MediaWiki\Skin\Components\SkinComponentRegistryContext;
use MediaWiki\Skin\Components\SkinComponentUtils;
use MediaWiki\SpecialPage\SpecialPage;
use MediaWiki\Title\Title;
use MediaWiki\Title\TitleValue;
use MediaWiki\Upload\UploadBase;
use MediaWiki\User\User;
use MediaWiki\User\UserIdentity;
use MediaWiki\User\UserIdentityValue;
use MediaWiki\WikiMap\WikiMap;
use Wikimedia\IPUtils;
use Wikimedia\ObjectCache\WANObjectCache;
use Wikimedia\Rdbms\IDBAccessObject;
 
abstract class Skin extends ContextSource {
    use ProtectedHookAccessorTrait;
 
    private $defaultLinkOptions;
 
    protected $skinname = null;
 
    protected $options = [];
    protected $mRelevantTitle = null;
 
    private $mRelevantUser = false;
 
    protected const VERSION_MAJOR = 1;
 
    private $languageLinks;
 
    private $sidebar;
 
    private $componentRegistry = null;
 
    public static function getVersion() {
        return self::VERSION_MAJOR;
    }
 
    final protected function getComponent( string $name ): SkinComponent {
        return $this->componentRegistry->getComponent( $name );
    }
 
    public function getTemplateData() {
        $title = $this->getTitle();
        $out = $this->getOutput();
        $user = $this->getUser();
        $isMainPage = $title->isMainPage();
        $blankedHeading = false;
        // Heading can only be blanked on "views". It should
        // still show on action=edit, diff pages and action=history
        $isHeadingOverridable = $this->getContext()->getActionName() === 'view' &&
            !$this->getRequest()->getRawVal( 'diff' );
 
        if ( $isMainPage && $isHeadingOverridable ) {
            // Special casing for the main page to allow more freedom to editors, to
            // design their home page differently. This came up in T290480.
            // The parameter for logged in users is optional and may
            // or may not be used.
            $titleMsg = $user->isAnon() ?
                $this->msg( 'mainpage-title' ) :
                $this->msg( 'mainpage-title-loggedin', $user->getName() );
 
            // T298715: Use content language rather than user language so that
            // the custom page heading is shown to all users, not just those that have
            // their interface set to the site content language.
            //
            // T331095: Avoid Message::inContentLanguage and, just like Parser,
            // pick the language variant based on the current URL and/or user
            // preference if their variant relates to the content language.
            $forceUIMsgAsContentMsg = $this->getConfig()
                ->get( MainConfigNames::ForceUIMsgAsContentMsg );
            if ( !in_array( $titleMsg->getKey(), (array)$forceUIMsgAsContentMsg ) ) {
                $services = MediaWikiServices::getInstance();
                $contLangVariant = $services->getLanguageConverterFactory()
                    ->getLanguageConverter( $services->getContentLanguage() )
                    ->getPreferredVariant();
                $titleMsg->inLanguage( $contLangVariant );
            }
            $titleMsg->setInterfaceMessageFlag( true );
            $blankedHeading = $titleMsg->isBlank();
            if ( !$titleMsg->isDisabled() ) {
                $htmlTitle = $titleMsg->parse();
            } else {
                $htmlTitle = $out->getPageTitle();
            }
        } else {
            $htmlTitle = $out->getPageTitle();
        }
 
        $data = [
            // raw HTML
            'html-title-heading' => Html::rawElement(
                'h1',
                [
                    'id' => 'firstHeading',
                    'class' => 'firstHeading mw-first-heading',
                    'style' => $blankedHeading ? 'display: none' : null
                ] + $this->getUserLanguageAttributes(),
                $htmlTitle
            ),
            'html-title' => $htmlTitle ?: null,
            // Boolean values
            'is-title-blank' => $blankedHeading, // @since 1.38
            'is-anon' => $user->isAnon(),
            'is-article' => $out->isArticle(),
            'is-mainpage' => $isMainPage,
            'is-specialpage' => $title->isSpecialPage(),
            'canonical-url' => $this->getCanonicalUrl(),
        ];
 
        $components = $this->componentRegistry->getComponents();
        foreach ( $components as $componentName => $component ) {
            $data['data-' . $componentName] = $component->getTemplateData();
        }
        return $data;
    }
 
    public static function normalizeKey( string $key ) {
        $config = MediaWikiServices::getInstance()->getMainConfig();
        $defaultSkin = $config->get( MainConfigNames::DefaultSkin );
        $fallbackSkin = $config->get( MainConfigNames::FallbackSkin );
        $skinFactory = MediaWikiServices::getInstance()->getSkinFactory();
        $skinNames = $skinFactory->getInstalledSkins();
 
        // Make keys lowercase for case-insensitive matching.
        $skinNames = array_change_key_case( $skinNames, CASE_LOWER );
        $key = strtolower( $key );
        $defaultSkin = strtolower( $defaultSkin );
        $fallbackSkin = strtolower( $fallbackSkin );
 
        if ( $key == '' || $key == 'default' ) {
            // Don't return the default immediately;
            // in a misconfiguration we need to fall back.
            $key = $defaultSkin;
        }
 
        if ( isset( $skinNames[$key] ) ) {
            return $key;
        }
 
        // Older versions of the software used a numeric setting
        // in the user preferences.
        $fallback = [
            0 => $defaultSkin,
            2 => 'cologneblue'
        ];
 
        if ( isset( $fallback[$key] ) ) {
            // @phan-suppress-next-line PhanTypeMismatchDimFetch False positive
            $key = $fallback[$key];
        }
 
        if ( isset( $skinNames[$key] ) ) {
            return $key;
        } elseif ( isset( $skinNames[$defaultSkin] ) ) {
            return $defaultSkin;
        } else {
            return $fallbackSkin;
        }
    }
 
    public function __construct( $options = null ) {
        if ( is_string( $options ) ) {
            $this->skinname = $options;
        } elseif ( $options ) {
            $name = $options['name'] ?? null;
 
            if ( !$name ) {
                throw new SkinException( 'Skin name must be specified' );
            }
 
            // Defaults are set in Skin::getOptions()
            $this->options = $options;
            $this->skinname = $name;
        }
        $this->defaultLinkOptions = $this->getOptions()['link'];
        $this->componentRegistry = new SkinComponentRegistry(
            new SkinComponentRegistryContext( $this )
        );
    }
 
    public function getSkinName() {
        return $this->skinname;
    }
 
    public function isResponsive() {
        $isSkinResponsiveCapable = $this->getOptions()['responsive'];
        $userOptionsLookup = MediaWikiServices::getInstance()->getUserOptionsLookup();
 
        return $isSkinResponsiveCapable &&
            $userOptionsLookup->getBoolOption( $this->getUser(), 'skin-responsive' );
    }
 
    public function initPage( OutputPage $out ) {
        $skinMetaTags = $this->getConfig()->get( MainConfigNames::SkinMetaTags );
        $siteName = $this->getConfig()->get( MainConfigNames::Sitename );
        $this->preloadExistence();
 
        if ( $this->isResponsive() ) {
            $out->addMeta(
                'viewport',
                'width=device-width, initial-scale=1.0, ' .
                'user-scalable=yes, minimum-scale=0.25, maximum-scale=5.0'
            );
        } else {
            // Force the desktop experience on an iPad by resizing the mobile viewport to
            // the value of @min-width-breakpoint-desktop (1120px).
            // This is as @min-width-breakpoint-desktop-wide usually tends to optimize
            // for larger screens with max-widths and margins.
            // The initial-scale SHOULD NOT be set here as defining it will impact zoom
            // on mobile devices.
            $out->addMeta(
                'viewport',
                'width=1120'
            );
        }
 
        $tags = [
            'og:site_name' => $siteName,
            'og:title' => $out->getHTMLTitle(),
            'twitter:card' => 'summary_large_image',
            'og:type' => 'website',
        ];
 
        // Support sharing on platforms such as Facebook and Twitter
        foreach ( $tags as $key => $value ) {
            if ( in_array( $key, $skinMetaTags ) ) {
                $out->addMeta( $key, $value );
            }
        }
    }
 
    public function getDefaultModules() {
        $out = $this->getOutput();
 
        $options = $this->getOptions();
        // Modules declared in the $modules literal are loaded
        // for ALL users, on ALL pages, in ALL skins.
        // Keep this list as small as possible!
        $modules = [
            // The 'styles' key sets render-blocking style modules
            // Unlike other keys in $modules, this is an associative array
            // where each key is its own group pointing to a list of modules
            'styles' => [
                'skin' => $options['styles'],
                'core' => [],
                'content' => [],
                'syndicate' => [],
                'user' => []
            ],
            'core' => [
                'site',
                'mediawiki.page.ready',
            ],
            // modules that enhance the content in some way
            'content' => [],
            // modules relating to search functionality
            'search' => [],
            // Skins can register their own scripts
            'skin' => $options['scripts'],
            // modules relating to functionality relating to watching an article
            'watch' => [],
            // modules which relate to the current users preferences
            'user' => [],
            // modules relating to RSS/Atom Feeds
            'syndicate' => [],
        ];
 
        $bodyHtml = $out->getHTML();
        // Preload jquery.tablesorter for mediawiki.page.ready
        if ( str_contains( $bodyHtml, 'sortable' ) ) {
            $modules['content'][] = 'jquery.tablesorter';
            $modules['styles']['content'][] = 'jquery.tablesorter.styles';
        }
 
        // Preload jquery.makeCollapsible for mediawiki.page.ready
        if ( str_contains( $bodyHtml, 'mw-collapsible' ) ) {
            $modules['content'][] = 'jquery.makeCollapsible';
            $modules['styles']['content'][] = 'jquery.makeCollapsible.styles';
        }
 
        // Load relevant styles on wiki pages that use mw-ui-button.
        // Since 1.26, this no longer loads unconditionally. Special pages
        // and extensions should load this via addModuleStyles() instead.
        if ( str_contains( $bodyHtml, 'mw-ui-button' ) ) {
            $modules['styles']['content'][] = 'mediawiki.ui.button';
        }
        // Since 1.41, styling for mw-message-box is only required for
        // messages that appear in article content.
        // This should only be removed when a suitable alternative exists
        // e.g. https://phabricator.wikimedia.org/T363607 is resolved.
        if ( str_contains( $bodyHtml, 'mw-message-box' ) ) {
            $modules['styles']['content'][] = 'mediawiki.legacy.messageBox';
        }
        // Since 1.46, links to temporary accounts in page content are expected to be styled.
        if ( str_contains( $bodyHtml, 'mw-tempuserlink' ) ) {
            $modules['styles']['content'][] = 'mediawiki.interface.helpers.styles';
            $modules['styles']['content'][] = 'mediawiki.interface.helpers.linker.styles';
        }
 
        $title = $this->getTitle();
        $namespace = $title ? $title->getNamespace() : 0;
        // If the page is using Codex message box markup load Codex styles.
        // Since 1.41. Skins can unset this if they prefer to handle this via other
        // means.
        // For content, this should not be considered stable, and will likely
        // be removed when https://phabricator.wikimedia.org/T363607 is resolved.
        $containsUserGeneratedContent = str_contains( $bodyHtml, 'mw-parser-output' );
        $containsCodexMessageBox = str_contains( $bodyHtml, 'cdx-message' );
        if ( $containsCodexMessageBox && $containsUserGeneratedContent && $namespace !== NS_SPECIAL ) {
            $modules['styles']['content'][] = 'mediawiki.codex.messagebox.styles';
        }
 
        if ( $out->isTOCEnabled() ) {
            $modules['content'][] = 'mediawiki.toc';
        }
 
        $authority = $this->getAuthority();
        $relevantTitle = $this->getRelevantTitle();
        if ( $authority->isRegistered()
            && $authority->isAllowedAll( 'viewmywatchlist', 'editmywatchlist' )
            && $relevantTitle && $relevantTitle->canExist()
        ) {
            $modules['watch'][] = 'mediawiki.page.watch.ajax';
        }
 
        $userOptionsLookup = MediaWikiServices::getInstance()->getUserOptionsLookup();
        $userIdentity = $authority->getUser();
        if ( $userOptionsLookup->getBoolOption( $userIdentity, 'editsectiononrightclick' )
            || ( $out->isArticle() && $userOptionsLookup->getOption( $userIdentity, 'editondblclick' ) )
        ) {
            $modules['user'][] = 'mediawiki.misc-authed-pref';
        }
 
        if ( $out->isSyndicated() ) {
            $modules['styles']['syndicate'][] = 'mediawiki.feedlink';
        }
 
        if ( $authority->isTemp() ) {
            $modules['user'][] = 'mediawiki.tempUserBanner';
            $modules['styles']['user'][] = 'mediawiki.tempUserBanner.styles';
        }
 
        if ( $namespace === NS_FILE ) {
            $modules['styles']['core'][] = 'filepage'; // local Filepage.css, T31277, T356505
        }
 
        return $modules;
    }
 
    private function preloadExistence() {
        $titles = [];
 
        // User/talk link
        $user = $this->getUser();
        if ( $user->isRegistered() ) {
            $titles[] = $user->getUserPage();
            $titles[] = $user->getTalkPage();
        }
 
        // Check, if the page can hold some kind of content, otherwise do nothing
        $title = $this->getRelevantTitle();
        if ( $title && $title->canExist() && $title->canHaveTalkPage() ) {
            $namespaceInfo = MediaWikiServices::getInstance()->getNamespaceInfo();
            if ( $title->isTalkPage() ) {
                $titles[] = $namespaceInfo->getSubjectPage( $title );
            } else {
                $titles[] = $namespaceInfo->getTalkPage( $title );
            }
        }
 
        // Preload for self::getCategoryLinks
        $allCats = $this->getOutput()->getCategoryLinks();
        if ( isset( $allCats['normal'] ) && $allCats['normal'] !== [] ) {
            $catLink = Title::newFromText( $this->msg( 'pagecategorieslink' )->inContentLanguage()->text() );
            if ( $catLink ) {
                // If this is a special page, the LinkBatch would skip it
                $titles[] = $catLink;
            }
        }
 
        $this->getHookRunner()->onSkinPreloadExistence( $titles, $this );
 
        if ( $titles ) {
            $linkBatchFactory = MediaWikiServices::getInstance()->getLinkBatchFactory();
            $linkBatchFactory->newLinkBatch( $titles )
                ->setCaller( __METHOD__ )
                ->execute();
        }
    }
 
    public function setRelevantTitle( $t ) {
        $this->mRelevantTitle = $t;
    }
 
    public function getRelevantTitle() {
        return $this->mRelevantTitle ?? $this->getTitle();
    }
 
    public function setRelevantUser( ?UserIdentity $u ) {
        $this->mRelevantUser = $u;
    }
 
    public function getRelevantUser(): ?UserIdentity {
        if ( $this->mRelevantUser === false ) {
            $this->mRelevantUser = null; // false indicates we never attempted to load it.
            $title = $this->getRelevantTitle();
            if ( $title->hasSubjectNamespace( NS_USER ) ) {
                $services = MediaWikiServices::getInstance();
                $rootUser = $title->getRootText();
                $userNameUtils = $services->getUserNameUtils();
                if ( $userNameUtils->isIP( $rootUser ) ) {
                    $this->mRelevantUser = UserIdentityValue::newAnonymous( $rootUser );
                } else {
                    $user = $services->getUserIdentityLookup()->getUserIdentityByName( $rootUser );
                    $this->mRelevantUser = $user && $user->isRegistered() ? $user : null;
                }
            }
        }
 
        // The relevant user should only be set if it exists. However, if it exists but is hidden,
        // and the viewer cannot see hidden users, this exposes the fact that the user exists;
        // pretend like the user does not exist in such cases, by setting it to null. T120883
        if ( $this->mRelevantUser && $this->mRelevantUser->isRegistered() ) {
            $userBlock = MediaWikiServices::getInstance()
                ->getBlockManager()
                ->getBlock( $this->mRelevantUser, null );
            if ( $userBlock && $userBlock->getHideName() &&
                !$this->getAuthority()->isAllowed( 'hideuser' )
            ) {
                $this->mRelevantUser = null;
            }
        }
 
        return $this->mRelevantUser;
    }
 
    final public function outputPageFinal( OutputPage $out ) {
        // generate body
        ob_start();
        $this->outputPage();
        $html = ob_get_contents();
        ob_end_clean();
 
        // T259955: OutputPage::headElement must be called last
        // as it calls OutputPage::getRlClient, which freezes the ResourceLoader
        // modules queue for the current page load.
        // Since Skins can add ResourceLoader modules via OutputPage::addModule
        // and OutputPage::addModuleStyles changing this order can lead to
        // bugs.
        $head = $out->headElement( $this );
        $tail = $out->tailElement( $this );
 
        echo $head . $html . $tail;
    }
 
    abstract public function outputPage();
 
    public function getPageClasses( $title ) {
        $services = MediaWikiServices::getInstance();
        $ns = $title->getNamespace();
        $numeric = 'ns-' . $ns;
 
        if ( $title->isSpecialPage() ) {
            $type = 'ns-special';
            // T25315: provide a class based on the canonical special page name without subpages
            [ $canonicalName ] = $services->getSpecialPageFactory()->resolveAlias( $title->getDBkey() );
            if ( $canonicalName ) {
                $type .= ' ' . Sanitizer::escapeClass( "mw-special-$canonicalName" );
            } else {
                $type .= ' mw-invalidspecialpage';
            }
        } else {
            if ( $title->isTalkPage() ) {
                $type = 'ns-talk';
            } else {
                $type = 'ns-subject';
            }
            // T208315: add HTML class when the user can edit the page
            if ( $this->getAuthority()->probablyCan( 'edit', $title ) ) {
                $type .= ' mw-editable';
            }
        }
 
        $titleFormatter = $services->getTitleFormatter();
        $name = Sanitizer::escapeClass( 'page-' . $titleFormatter->getPrefixedText( $title ) );
        $root = Sanitizer::escapeClass( 'rootpage-' . $titleFormatter->formatTitle( $ns, $title->getRootText() ) );
        // Add a static class that is not subject to translation to allow extensions/skins/global code to target main
        // pages reliably (T363281)
        if ( $title->isMainPage() ) {
            $name .= ' page-Main_Page';
        }
 
        return "$numeric $type $name $root";
    }
 
    public function getHtmlElementAttributes() {
        $lang = $this->getLanguage();
        return [
            'lang' => $lang->getHtmlCode(),
            'dir' => $lang->getDir(),
            'class' => 'client-nojs',
        ];
    }
 
    public function getCategoryLinks() {
        $out = $this->getOutput();
        $allCats = $out->getCategoryLinks();
        $title = $this->getTitle();
        $services = MediaWikiServices::getInstance();
        $linkRenderer = $services->getLinkRenderer();
 
        if ( $allCats === [] ) {
            return '';
        }
 
        $embed = "<li>";
        $pop = "</li>";
 
        $s = '';
        $colon = $this->msg( 'colon-separator' )->escaped();
 
        if ( !empty( $allCats['normal'] ) ) {
            $t = $embed . implode( $pop . $embed, $allCats['normal'] ) . $pop;
 
            $msg = $this->msg( 'pagecategories' )->numParams( count( $allCats['normal'] ) );
            $linkPage = $this->msg( 'pagecategorieslink' )->inContentLanguage()->text();
            $pageCategoriesLinkTitle = Title::newFromText( $linkPage );
            if ( $pageCategoriesLinkTitle ) {
                $link = $linkRenderer->makeLink( $pageCategoriesLinkTitle, $msg->text() );
            } else {
                $link = $msg->escaped();
            }
            $s .= Html::rawElement(
                'div',
                [ 'id' => 'mw-normal-catlinks', 'class' => 'mw-normal-catlinks' ],
                $link . $colon . Html::rawElement( 'ul', [], $t )
            );
        }
 
        # Hidden categories
        if ( isset( $allCats['hidden'] ) ) {
            $userOptionsLookup = $services->getUserOptionsLookup();
 
            if ( $userOptionsLookup->getBoolOption( $this->getUser(), 'showhiddencats' ) ) {
                $class = ' mw-hidden-cats-user-shown';
            } elseif ( $title->inNamespace( NS_CATEGORY ) ) {
                $class = ' mw-hidden-cats-ns-shown';
            } else {
                $class = ' mw-hidden-cats-hidden';
            }
 
            $s .= Html::rawElement(
                'div',
                [ 'id' => 'mw-hidden-catlinks', 'class' => "mw-hidden-catlinks$class" ],
                $this->msg( 'hidden-categories' )->numParams( count( $allCats['hidden'] ) )->escaped() .
                    $colon .
                    Html::rawElement(
                        'ul',
                        [],
                        $embed . implode( $pop . $embed, $allCats['hidden'] ) . $pop
                    )
            );
        }
 
        return $s;
    }
 
    public function getCategories() {
        $userOptionsLookup = MediaWikiServices::getInstance()->getUserOptionsLookup();
        $showHiddenCats = $userOptionsLookup->getBoolOption( $this->getUser(), 'showhiddencats' );
 
        $catlinks = $this->getCategoryLinks();
        // Check what we're showing
        $allCats = $this->getOutput()->getCategoryLinks();
        $showHidden = $showHiddenCats || $this->getTitle()->inNamespace( NS_CATEGORY );
 
        $classes = [ 'catlinks' ];
        if ( empty( $allCats['normal'] ) && !( !empty( $allCats['hidden'] ) && $showHidden ) ) {
            $classes[] = 'catlinks-allhidden';
        }
 
        return Html::rawElement(
            'div',
            [ 'id' => 'catlinks', 'class' => $classes,
              'data-mw-interface' => '' ],
            $catlinks
        );
    }
 
    protected function afterContentHook() {
        $data = '';
 
        if ( $this->getHookRunner()->onSkinAfterContent( $data, $this ) ) {
            // adding just some spaces shouldn't toggle the output
            // of the whole <div/>, so we use trim() here
            if ( trim( $data ) != '' ) {
                // Doing this here instead of in the skins to
                // ensure that the div has the same ID in all
                // skins
                $data = "<div id='mw-data-after-content'>\n" .
                    "\t$data\n" .
                    "</div>\n";
            }
        } else {
            wfDebug( "Hook SkinAfterContent changed output processing." );
        }
 
        return $data;
    }
 
    private function getCanonicalUrl() {
        $title = $this->getTitle();
        $oldid = $this->getOutput()->getRevisionId();
        if ( $oldid ) {
            return $title->getCanonicalURL( 'oldid=' . $oldid );
        } else {
            // oldid not available for non existing pages
            return $title->getCanonicalURL();
        }
    }
 
    public function printSource() {
        $urlUtils = MediaWikiServices::getInstance()->getUrlUtils();
        $url = htmlspecialchars( $urlUtils->expandIRI( $this->getCanonicalUrl() ) ?? '' );
 
        return $this->msg( 'retrievedfrom' )
            ->rawParams( '<a dir="ltr" href="' . $url . '">' . $url . '</a>' )
            ->parse();
    }
 
    public function getUndeleteLink() {
        $action = $this->getRequest()->getRawVal( 'action' ) ?? 'view';
        $title = $this->getTitle();
        $linkRenderer = MediaWikiServices::getInstance()->getLinkRenderer();
 
        if ( ( !$title->exists() || $action == 'history' ) &&
            $this->getAuthority()->probablyCan( 'deletedhistory', $title )
        ) {
            $n = $title->getDeletedEditsCount();
 
            if ( $n ) {
                if ( $this->getAuthority()->probablyCan( 'undelete', $title ) ) {
                    $msg = 'thisisdeleted';
                } else {
                    $msg = 'viewdeleted';
                }
 
                $subtitle = $this->msg( $msg )->rawParams(
                    $linkRenderer->makeKnownLink(
                        SpecialPage::getTitleFor( 'Undelete', $title->getPrefixedDBkey() ),
                        $this->msg( 'restorelink' )->numParams( $n )->text() )
                    )->escaped();
 
                $links = [];
                // Add link to page logs, unless we're on the history page (which
                // already has one)
                if ( $action !== 'history' ) {
                    $links[] = $linkRenderer->makeKnownLink(
                        SpecialPage::getTitleFor( 'Log' ),
                        $this->msg( 'viewpagelogs-lowercase' )->text(),
                        [],
                        [ 'page' => $title->getPrefixedText() ]
                    );
                }
 
                // Allow extensions to add more links
                $this->getHookRunner()->onUndeletePageToolLinks(
                    $this->getContext(), $linkRenderer, $links );
 
                if ( $links ) {
                    $subtitle .= ''
                        . $this->msg( 'word-separator' )->escaped()
                        . $this->msg( 'parentheses' )
                            ->rawParams( $this->getLanguage()->pipeList( $links ) )
                            ->escaped();
                }
 
                return Html::rawElement( 'div', [ 'class' => 'mw-undelete-subtitle' ], $subtitle );
            }
        }
 
        return '';
    }
 
    private function subPageSubtitleInternal() {
        $services = MediaWikiServices::getInstance();
        $linkRenderer = $services->getLinkRenderer();
        $out = $this->getOutput();
        $title = $out->getTitle();
        $subpages = '';
 
        if ( !$this->getHookRunner()->onSkinSubPageSubtitle( $subpages, $this, $out ) ) {
            return $subpages;
        }
 
        $hasSubpages = $services->getNamespaceInfo()->hasSubpages( $title->getNamespace() );
        if ( !$out->isArticle() || !$hasSubpages ) {
            return $subpages;
        }
 
        $ptext = $title->getPrefixedText();
        if ( str_contains( $ptext, '/' ) ) {
            $links = explode( '/', $ptext );
            array_pop( $links );
            $count = 0;
            $growingLink = '';
            $display = '';
            $lang = $this->getLanguage();
 
            foreach ( $links as $link ) {
                $growingLink .= $link;
                $display .= $link;
                $linkObj = Title::newFromText( $growingLink );
 
                if ( $linkObj && $linkObj->isKnown() ) {
                    $getlink = $linkRenderer->makeKnownLink( $linkObj, $display );
 
                    $count++;
 
                    if ( $count > 1 ) {
                        $subpages .= $this->msg( 'pipe-separator' )->escaped();
                    } else {
                        $subpages .= '&lt; ';
                    }
 
                    $subpages .= Html::rawElement( 'bdi', [ 'dir' => $lang->getDir() ], $getlink );
                    $display = '';
                } else {
                    $display .= '/';
                }
                $growingLink .= '/';
            }
        }
 
        return $subpages;
    }
 
    private function getFooterTemplateDataItem( string $dataKey, string $name ) {
        $footerData = $this->getComponent( 'footer' )->getTemplateData();
        $items = $footerData[ $dataKey ]['array-items'] ?? [];
        foreach ( $items as $item ) {
            if ( $item['name'] === $name ) {
                return $item['html'];
            }
        }
        return '';
    }
 
    final public function getCopyright(): string {
        return $this->getFooterTemplateDataItem( 'data-info', 'copyright' );
    }
 
    public function logoText( $align = '' ) {
        if ( $align != '' ) {
            $a = " style='float: {$align};'";
        } else {
            $a = '';
        }
 
        $mp = $this->msg( 'mainpage' )->escaped();
        $url = htmlspecialchars( Title::newMainPage()->getLocalURL() );
 
        $logourl = RL\SkinModule::getAvailableLogos(
            $this->getConfig(),
            $this->getLanguage()->getCode()
        )[ '1x' ];
        return "<a href='{$url}'><img{$a} src='{$logourl}' alt='[{$mp}]' /></a>";
    }
 
    final public function getFooterIcons() {
        return SkinComponentFooter::getFooterIconsData(
            $this->getConfig()
        );
    }
 
    final public function makeFooterIcon( $icon, $withImage = 'withImage' ) {
        return SkinComponentFooter::makeFooterIconHTML(
            $this->getConfig(), $icon, $withImage
        );
    }
 
    public function editUrlOptions() {
        $options = [ 'action' => 'edit' ];
        $out = $this->getOutput();
 
        if ( !$out->isRevisionCurrent() ) {
            $options['oldid'] = intval( $out->getRevisionId() );
        }
 
        return $options;
    }
 
    public function showEmailUser( $id ) {
        if ( $id instanceof UserIdentity ) {
            $targetUser = User::newFromIdentity( $id );
        } else {
            $targetUser = User::newFromId( $id );
        }
 
        # The sending user must have a confirmed email address and the receiving
        # user must accept emails from the sender.
        $emailUser = MediaWikiServices::getInstance()->getEmailUserFactory()
            ->newEmailUser( $this->getUser() );
 
        return $emailUser->canSend()->isOK()
            && $emailUser->validateTarget( $targetUser )->isOK();
    }
 
    /* these are used extensively in SkinTemplate, but also some other places */
 
    public static function makeMainPageUrl( $urlaction = '' ) {
        $title = Title::newMainPage();
 
        return $title->getLinkURL( $urlaction );
    }
 
    public static function makeInternalOrExternalUrl( $name ) {
        $protocols = MediaWikiServices::getInstance()->getUrlUtils()->validProtocols();
 
        if ( preg_match( '/^(?i:' . $protocols . ')/', $name ) ) {
            return $name;
        } else {
            $title = $name instanceof Title ? $name : Title::newFromText( $name );
            return $title ? $title->getLinkURL() : '';
        }
    }
 
    protected static function makeUrlDetails( $name, $urlaction = '' ) {
        $title = $name instanceof Title ? $name : Title::newFromText( $name );
        return [
            'href' => $title ? $title->getLocalURL( $urlaction ) : '',
            'exists' => $title && $title->isKnown(),
        ];
    }
 
    protected static function makeKnownUrlDetails( $name, $urlaction = '' ) {
        $title = $name instanceof Title ? $name : Title::newFromText( $name );
        return [
            'href' => $title ? $title->getLocalURL( $urlaction ) : '',
            'exists' => (bool)$title,
        ];
    }
 
    public function mapInterwikiToLanguage( $code ) {
        $map = $this->getConfig()->get( MainConfigNames::InterlanguageLinkCodeMap );
        return $map[ $code ] ?? $code;
    }
 
    public function getLanguages() {
        if ( $this->getConfig()->get( MainConfigNames::HideInterlanguageLinks ) ) {
            return [];
        }
        if ( $this->languageLinks === null ) {
            $hookRunner = $this->getHookRunner();
 
            $userLang = $this->getLanguage();
            $languageLinks = [];
            $langNameUtils = MediaWikiServices::getInstance()->getLanguageNameUtils();
 
            foreach ( $this->getOutput()->getLanguageLinks() as $languageLinkText ) {
                [ $prefix, $title ] = explode( ':', $languageLinkText, 2 );
                $class = 'interlanguage-link interwiki-' . $prefix;
 
                [ $title, $frag ] = array_pad( explode( '#', $title, 2 ), 2, '' );
                $languageLinkTitle = TitleValue::tryNew( NS_MAIN, $title, $frag, $prefix );
                if ( $languageLinkTitle === null ) {
                    continue;
                }
                $ilInterwikiCode = $this->mapInterwikiToLanguage( $prefix );
 
                $ilLangName = $langNameUtils->getLanguageName( $ilInterwikiCode );
 
                if ( strval( $ilLangName ) === '' ) {
                    $ilDisplayTextMsg = $this->msg( "interlanguage-link-$ilInterwikiCode" );
                    if ( !$ilDisplayTextMsg->isDisabled() ) {
                        // Use custom MW message for the display text
                        $ilLangName = $ilDisplayTextMsg->text();
                    } else {
                        // Last resort: fallback to the language link target
                        $ilLangName = $languageLinkText;
                    }
                } else {
                    // Use the language autonym as display text
                    $ilLangName = $this->getLanguage()->ucfirst( $ilLangName );
                }
 
                // CLDR extension or similar is required to localize the language name;
                // otherwise we'll end up with the autonym again.
                $ilLangLocalName =
                    $langNameUtils->getLanguageName( $ilInterwikiCode, $userLang->getCode() );
 
                $languageLinkTitleText = $languageLinkTitle->getText();
                if ( $ilLangLocalName === '' ) {
                    $ilFriendlySiteName =
                        $this->msg( "interlanguage-link-sitename-$ilInterwikiCode" );
                    if ( !$ilFriendlySiteName->isDisabled() ) {
                        if ( $languageLinkTitleText === '' ) {
                            $ilTitle =
                                $this->msg( 'interlanguage-link-title-nonlangonly',
                                    $ilFriendlySiteName->text() )->text();
                        } else {
                            $ilTitle =
                                $this->msg( 'interlanguage-link-title-nonlang',
                                    $languageLinkTitleText, $ilFriendlySiteName->text() )->text();
                        }
                    } else {
                        // we have nothing friendly to put in the title, so fall back to
                        // displaying the interlanguage link itself in the title text
                        // (similar to what is done in page content)
                        $ilTitle = $languageLinkTitle->getInterwiki() . ":$languageLinkTitleText";
                    }
                } elseif ( $languageLinkTitleText === '' ) {
                    $ilTitle =
                        $this->msg( 'interlanguage-link-title-langonly', $ilLangLocalName )->text();
                } else {
                    $ilTitle =
                        $this->msg( 'interlanguage-link-title', $languageLinkTitleText,
                            $ilLangLocalName )->text();
                }
 
                $ilInterwikiCodeBCP47 = LanguageCode::bcp47( $ilInterwikiCode );
                // A TitleValue is sufficient above this point, but we need
                // a full Title for ::getFullURL() and the hook invocation
                $languageLinkFullTitle = Title::newFromLinkTarget( $languageLinkTitle );
                $languageLink = [
                    'href' => $languageLinkFullTitle->getFullURL(),
                    'text' => $ilLangName,
                    'title' => $ilTitle,
                    'class' => $class,
                    'link-class' => 'interlanguage-link-target',
                    'lang' => $ilInterwikiCodeBCP47,
                    'hreflang' => $ilInterwikiCodeBCP47,
                    'data-title' => $languageLinkTitleText,
                    'data-language-autonym' => $ilLangName,
                    'data-language-local-name' => $ilLangLocalName,
                ];
                $hookRunner->onSkinTemplateGetLanguageLink(
                    $languageLink, $languageLinkFullTitle, $this->getTitle(), $this->getOutput()
                );
                $languageLinks[] = $languageLink;
            }
            $this->languageLinks = $languageLinks;
        }
 
        return $this->languageLinks;
    }
 
    protected function buildNavUrls() {
        $services = MediaWikiServices::getInstance();
        $out = $this->getOutput();
        $title = $this->getTitle();
        $thispage = $title->getPrefixedDBkey();
        $uploadNavigationUrl = $this->getConfig()->get( MainConfigNames::UploadNavigationUrl );
 
        $nav_urls = [];
        $nav_urls['mainpage'] = [ 'href' => self::makeMainPageUrl() ];
        if ( $uploadNavigationUrl ) {
            $nav_urls['upload'] = [ 'href' => $uploadNavigationUrl ];
        } elseif ( UploadBase::isEnabled() && UploadBase::isAllowed( $this->getAuthority() ) === true ) {
            $nav_urls['upload'] = [ 'href' => SkinComponentUtils::makeSpecialUrl( 'Upload' ) ];
        } else {
            $nav_urls['upload'] = false;
        }
 
        $nav_urls['print'] = false;
        $nav_urls['permalink'] = false;
        $nav_urls['info'] = false;
        $nav_urls['whatlinkshere'] = false;
        $nav_urls['recentchangeslinked'] = false;
        $nav_urls['contributions'] = false;
        $nav_urls['log'] = false;
        $nav_urls['blockip'] = false;
        $nav_urls['changeblockip'] = false;
        $nav_urls['unblockip'] = false;
        $nav_urls['mute'] = false;
        $nav_urls['emailuser'] = false;
        $nav_urls['userrights'] = false;
 
        // A print stylesheet is attached to all pages, but nobody ever
        // figures that out. :)  Add a link...
        if ( !$out->isPrintable() && ( $out->isArticle() || $title->isSpecialPage() ) ) {
            $nav_urls['print'] = [
                'text' => $this->msg( 'printableversion' )->text(),
                'href' => 'javascript:print();'
            ];
        }
 
        if ( $out->isArticle() ) {
            // Also add a "permalink" while we're at it
            $revid = $out->getRevisionId();
            if ( $revid ) {
                $nav_urls['permalink'] = [
                    'icon' => 'link',
                    'text' => $this->msg( 'permalink' )->text(),
                    'href' => $title->getLocalURL( "oldid=$revid" )
                ];
            }
        }
 
        if ( $out->isArticleRelated() ) {
            $nav_urls['whatlinkshere'] = [
                'href' => SpecialPage::getTitleFor( 'Whatlinkshere', $thispage )->getLocalURL()
            ];
 
            $nav_urls['info'] = [
                'icon' => 'infoFilled',
                'text' => $this->msg( 'pageinfo-toolboxlink' )->text(),
                'href' => $title->getLocalURL( "action=info" )
            ];
 
            if ( $title->exists() || $title->inNamespace( NS_CATEGORY ) ) {
                $nav_urls['recentchangeslinked'] = [
                    'href' => SpecialPage::getTitleFor( 'Recentchangeslinked', $thispage )->getLocalURL()
                ];
            }
        }
 
        $user = $this->getRelevantUser();
        $target = false;
        $targetIsIpRange = false;
        if ( $user ) {
            // This will either be an account or an IP
            $target = $user->getName();
        } else {
            // Support finding the IP range if its the target
            $pageTarget = $this->getPageTarget();
            if ( $pageTarget ) {
                $CIDRLimit = $this->getConfig()
                    ->get( MainConfigNames::BlockCIDRLimit );
                [ $ip, $range ] = explode( '/', $pageTarget, 2 );
                if (
                    ( IPUtils::isIPv4( $ip ) && $range >= $CIDRLimit['IPv4'] ) ||
                    ( IPUtils::isIPv6( $ip ) && $range >= $CIDRLimit['IPv6'] )
                ) {
                    $target = IPUtils::sanitizeRange( $pageTarget );
                    $targetIsIpRange = true;
                }
            }
        }
        if ( !$target ) {
            return $nav_urls;
        }
 
        $nav_urls['contributions'] = [
            'text' => $this->msg( 'tool-link-contributions', $target )->text(),
            'href' => SkinComponentUtils::makeSpecialUrlSubpage( 'Contributions', $target ),
            'tooltip-params' => [ $target ],
        ];
        $nav_urls['log'] = [
            'icon' => 'listBullet',
            'href' => SkinComponentUtils::makeSpecialUrlSubpage( 'Log', $target )
        ];
 
        // Check if the user/ip/ip range is blocked
        if ( $this->getAuthority()->isAllowed( 'block' ) ) {
            $userBlock = null;
            if ( $targetIsIpRange ) {
                // getBlock doesn't support ip range lookups so check independently if the target is a range
                $userBlock = $services
                    ->getBlockManager()
                    ->getIpRangeBlock( $target );
            } elseif ( $user ) {
                // Check if the user or IP is already blocked
                $userBlock = $services
                    ->getBlockManager()
                    ->getBlock( $user, null );
            }
 
            // If the block exists, only continue if it's not an autoblock. See T384147.
            if (
                $userBlock &&
                $userBlock->getType() !== Block::TYPE_AUTO
            ) {
                $useCodex = $this->getConfig()->get( MainConfigNames::UseCodexSpecialBlock );
                $nav_urls[ $useCodex ? 'block-manage-blocks' : 'changeblockip' ] = [
                    'icon' => 'block',
                    'href' => SkinComponentUtils::makeSpecialUrlSubpage( 'Block', $target )
                ];
                if ( !$useCodex ) {
                    $nav_urls['unblockip'] = [
                        'icon' => 'unBlock',
                        'href' => SkinComponentUtils::makeSpecialUrlSubpage( 'Unblock', $target ),
                        'text' => $this->msg(
                            $targetIsIpRange ? 'unblockiprange' : 'unblockip'
                        )->text(),
                    ];
                }
            } else {
                $nav_urls['blockip'] = [
                    'icon' => 'block',
                    'text' => $this->msg(
                        $targetIsIpRange ? 'blockiprange' : 'blockip'
                    )->text(),
                    'href' => SkinComponentUtils::makeSpecialUrlSubpage( 'Block', $target ),
                ];
            }
        }
 
        if ( $user ) {
            if ( $this->showEmailUser( $user ) ) {
                $nav_urls['emailuser'] = [
                    'text' => $this->msg( 'tool-link-emailuser', $target )->text(),
                    'href' => SkinComponentUtils::makeSpecialUrlSubpage( 'Emailuser', $target ),
                    'tooltip-params' => [ $target ],
                ];
            }
 
            if ( $user->isRegistered() ) {
                if ( $this->getUser()->isNamed() ) {
                    $nav_urls['mute'] = [
                        'text' => $this->msg( 'mute-preferences' )->text(),
                        'href' => SkinComponentUtils::makeSpecialUrlSubpage( 'Mute', $target )
                    ];
                }
 
                // Don't show links to Special:UserRights for temporary accounts (as they cannot have groups)
                $userNameUtils = $services->getUserNameUtils();
                $userGroupsAssignmentService = $services->getUserGroupAssignmentService();
                if ( !$userNameUtils->isTemp( $user->getName() ) ) {
                    $canChange = $userGroupsAssignmentService->userCanChangeRights(
                        $this->getAuthority(),
                        $user
                    );
                    $delimiter = $this->getConfig()->get(
                        MainConfigNames::UserrightsInterwikiDelimiter );
                    if ( str_contains( $target, $delimiter ) ) {
                        // Username contains interwiki delimiter, link it via the
                        // #{userid} syntax. (T260222)
                        $linkArgs = [ false, [ 'user' => '#' . $user->getId() ] ];
                    } else {
                        $linkArgs = [ $target ];
                    }
                    $nav_urls['userrights'] = [
                        'icon' => 'userGroup',
                        'text' => $this->msg(
                            $canChange ? 'tool-link-userrights' : 'tool-link-userrights-readonly',
                            $target
                        )->text(),
                        'href' => SkinComponentUtils::makeSpecialUrlSubpage( 'Userrights', ...$linkArgs )
                    ];
                }
            }
        }
 
        return $nav_urls;
    }
 
    final protected function buildFeedUrls() {
        $feeds = [];
        $out = $this->getOutput();
        if ( $out->isSyndicated() ) {
            foreach ( $out->getSyndicationLinks() as $format => $link ) {
                $feeds[$format] = [
                    // Messages: feed-atom, feed-rss
                    'text' => $this->msg( "feed-$format" )->text(),
                    'href' => $link
                ];
            }
        }
        return $feeds;
    }
 
    public function buildSidebar() {
        if ( $this->sidebar === null ) {
            $services = MediaWikiServices::getInstance();
            $callback = function ( $old = null, &$ttl = null ) {
                $bar = [];
                $this->addToSidebar( $bar, 'sidebar' );
 
                // This hook may vary its behaviour by skin.
                $this->getHookRunner()->onSkinBuildSidebar( $this, $bar );
                $msgCache = MediaWikiServices::getInstance()->getMessageCache();
                if ( $msgCache->isDisabled() ) {
                    // Don't cache the fallback if DB query failed. T133069
                    $ttl = WANObjectCache::TTL_UNCACHEABLE;
                }
 
                return $bar;
            };
 
            $msgCache = $services->getMessageCache();
            $wanCache = $services->getMainWANObjectCache();
            $config = $this->getConfig();
            $languageCode = $this->getLanguage()->getCode();
 
            $sidebar = $config->get( MainConfigNames::EnableSidebarCache )
                ? $wanCache->getWithSetCallback(
                    $wanCache->makeKey( 'sidebar', $languageCode, $this->getSkinName() ?? '' ),
                    $config->get( MainConfigNames::SidebarCacheExpiry ),
                    $callback,
                    [
                        'checkKeys' => [
                            // Unless there is both no exact $code override nor an i18n definition
                            // in the software, the only MediaWiki page to check is for $code.
                            $msgCache->getCheckKey( $languageCode )
                        ],
                        'lockTSE' => 30
                    ]
                )
                : $callback();
 
            $sidebar['TOOLBOX'] = array_merge(
                $this->makeToolbox(
                    $this->buildNavUrls(),
                    $this->buildFeedUrls()
                ), $sidebar['TOOLBOX'] ?? []
            );
 
            $sidebar['LANGUAGES'] = $this->getLanguages();
            // Apply post-processing to the cached value
            $this->getHookRunner()->onSidebarBeforeOutput( $this, $sidebar );
 
            $this->sidebar = $sidebar;
        }
 
        return $this->sidebar;
    }
 
    public function addToSidebar( &$bar, $message ) {
        $this->addToSidebarPlain( $bar, $this->msg( $message )->inContentLanguage()->plain() );
    }
 
    private function createSidebarItem( $target, $text ) {
        $config = $this->getConfig();
        $messageTitle = $config->get( MainConfigNames::EnableSidebarCache )
            ? Title::newMainPage() : $this->getTitle();
        $services = MediaWikiServices::getInstance();
        $urlUtils = $services->getUrlUtils();
 
        $extraAttribs = [];
 
        $msgLink = $this->msg( $target )->page( $messageTitle )->inContentLanguage();
        if ( $msgLink->exists() ) {
            $link = $msgLink->text();
            // Extra check in case a message does fancy stuff with {{#if:… and such
            if ( $link === '-' ) {
                return null;
            }
        } else {
            $link = $target;
        }
        $msgText = $this->msg( $text )->page( $messageTitle );
        if ( $msgText->exists() ) {
            $parsedText = $msgText->text();
        } else {
            $parsedText = $text;
        }
 
        if ( preg_match( '/^(?i:' . $urlUtils->validProtocols() . ')/', $link ) ) {
            $href = $link;
 
            // Parser::getExternalLinkAttribs won't work here because of the Namespace things
            if ( $config->get( MainConfigNames::NoFollowLinks ) &&
                !$urlUtils->matchesDomainList(
                    (string)$href,
                    (array)$config->get( MainConfigNames::NoFollowDomainExceptions )
                )
            ) {
                $extraAttribs['rel'] = 'nofollow';
            }
 
            if ( $config->get( MainConfigNames::ExternalLinkTarget ) ) {
                $extraAttribs['target'] =
                    $config->get( MainConfigNames::ExternalLinkTarget );
            }
        } else {
            $title = Title::newFromText( $link );
            $href = $title ? $title->fixSpecialName()->getLinkURL() : '';
        }
 
        $id = strtr( $text, ' ', '-' );
        return $extraAttribs + [
            'text' => $parsedText,
            'href' => $href,
            'icon' => $this->getSidebarIcon( $id ),
            'id' => Sanitizer::escapeIdForAttribute( 'n-' . $id ),
            'active' => false,
        ];
    }
 
    public function addToSidebarPlain( &$bar, $text ) {
        $lines = explode( "\n", $text );
 
        $heading = '';
        $config = $this->getConfig();
        $messageTitle = $config->get( MainConfigNames::EnableSidebarCache )
            ? Title::newMainPage() : $this->getTitle();
        $services = MediaWikiServices::getInstance();
        $messageParser = $services->getMessageParser();
        $urlUtils = $services->getUrlUtils();
 
        foreach ( $lines as $line ) {
            if ( !str_starts_with( $line, '*' ) ) {
                continue;
            }
            $line = rtrim( $line, "\r" ); // for Windows compat
 
            if ( !str_starts_with( $line, '**' ) ) {
                $heading = trim( $line, '* ' );
                if ( !array_key_exists( $heading, $bar ) ) {
                    $bar[$heading] = [];
                }
            } else {
                $line = trim( $line, '* ' );
 
                if ( str_contains( $line, '|' ) ) {
                    $line = $messageParser->transform( $line, false, null, $messageTitle );
                    $line = array_map( 'trim', explode( '|', $line, 2 ) );
                    if ( count( $line ) !== 2 ) {
                        // Second check, could be hit by people doing
                        // funky stuff with parserfuncs... (T35321)
                        continue;
                    }
 
                    $item = $this->createSidebarItem( $line[0], $line[1] );
                    if ( $item !== null ) {
                        $bar[$heading][] = $item;
                    }
                }
            }
        }
 
        return $bar;
    }
 
    private function getSidebarIcon( string $id ) {
        switch ( $id ) {
            case 'mainpage-description':
                return 'home';
            case 'randompage':
                return 'die';
            case 'recentchanges':
                return 'recentChanges';
            // These menu items are commonly added in MediaWiki:Sidebar. We should
            // reconsider the location of this logic in future.
            case 'help':
            case 'help-mediawiki':
                return 'help';
            case 'specialpages':
                return 'specialPages';
            default:
                return null;
        }
    }
 
    private function hideNewTalkMessagesForCurrentSession() {
        // Only show new talk page notification if there is a session,
        // (the client edited a page from this browser, or is logged-in).
        return !$this->getRequest()->getSession()->isPersistent();
    }
 
    public function getNewtalks() {
        if ( $this->hideNewTalkMessagesForCurrentSession() ) {
            return '';
        }
 
        $newMessagesAlert = '';
        $user = $this->getUser();
        $services = MediaWikiServices::getInstance();
        $linkRenderer = $services->getLinkRenderer();
        $userHasNewMessages = $services->getTalkPageNotificationManager()
            ->userHasNewMessages( $user );
        $timestamp = $services->getTalkPageNotificationManager()
            ->getLatestSeenMessageTimestamp( $user );
        $newtalks = !$userHasNewMessages ? [] : [
            [
            // TODO: Deprecate adding wiki and link to array and redesign GetNewMessagesAlert hook
            'wiki' => WikiMap::getCurrentWikiId(),
            'link' => $user->getTalkPage()->getLocalURL(),
            'rev' => $timestamp ? $services->getRevisionLookup()
                ->getRevisionByTimestamp( $user->getTalkPage(), $timestamp ) : null
            ]
        ];
        $out = $this->getOutput();
 
        // Allow extensions to disable or modify the new messages alert
        if ( !$this->getHookRunner()->onGetNewMessagesAlert(
            $newMessagesAlert, $newtalks, $user, $out )
        ) {
            return '';
        }
        if ( $newMessagesAlert ) {
            return $newMessagesAlert;
        }
 
        if ( $newtalks !== [] ) {
            $uTalkTitle = $user->getTalkPage();
            $lastSeenRev = $newtalks[0]['rev'];
            $numAuthors = 0;
            if ( $lastSeenRev !== null ) {
                $plural = true; // Default if we have a last seen revision: if unknown, use plural
                $revStore = $services->getRevisionStore();
                $latestRev = $revStore->getRevisionByTitle(
                    $uTalkTitle,
                    0,
                    IDBAccessObject::READ_NORMAL
                );
                if ( $latestRev !== null ) {
                    // Singular if only 1 unseen revision, plural if several unseen revisions.
                    $plural = $latestRev->getParentId() !== $lastSeenRev->getId();
                    $numAuthors = $revStore->countAuthorsBetween(
                        $uTalkTitle->getArticleID(),
                        $lastSeenRev,
                        $latestRev,
                        null,
                        10,
                        RevisionStore::INCLUDE_NEW
                    );
                }
            } else {
                // Singular if no revision -> diff link will show latest change only in any case
                $plural = false;
            }
            $plural = $plural ? 999 : 1;
            // 999 signifies "more than one revision". We don't know how many, and even if we did,
            // the number of revisions or authors is not necessarily the same as the number of
            // "messages".
            $newMessagesLink = $linkRenderer->makeKnownLink(
                $uTalkTitle,
                $this->msg( 'new-messages-link-plural', $plural )->text(),
                [],
                $uTalkTitle->isRedirect() ? [ 'redirect' => 'no' ] : []
            );
 
            $newMessagesDiffLink = $linkRenderer->makeKnownLink(
                $uTalkTitle,
                $this->msg( 'new-messages-diff-link-plural', $plural )->text(),
                [],
                $lastSeenRev !== null
                    ? [ 'oldid' => $lastSeenRev->getId(), 'diff' => 'cur' ]
                    : [ 'diff' => 'cur' ]
            );
 
            if ( $numAuthors >= 1 && $numAuthors <= 10 ) {
                $newMessagesAlert = $this->msg(
                    'new-messages-from-users'
                )->rawParams(
                    $newMessagesLink,
                    $newMessagesDiffLink
                )->numParams(
                    $numAuthors,
                    $plural
                );
            } else {
                // $numAuthors === 11 signifies "11 or more" ("more than 10")
                $newMessagesAlert = $this->msg(
                    $numAuthors > 10 ? 'new-messages-from-many-users' : 'new-messages'
                )->rawParams(
                    $newMessagesLink,
                    $newMessagesDiffLink
                )->numParams( $plural );
            }
            $newMessagesAlert = $newMessagesAlert->parse();
        }
 
        return $newMessagesAlert;
    }
 
    protected function getEmailConfirmationNotice(): string {
        $services = MediaWikiServices::getInstance();
        $component = new SkinComponentEmailConfirmationBanner(
            $services->getEmailConfirmationBannerHandler(),
            $this->getContext()
        );
        return $component->getTemplateData()['html'];
    }
 
    private function getCachedNotice( $name ) {
        $config = $this->getConfig();
 
        if ( $name === 'default' ) {
            // special case
            $notice = $config->get( MainConfigNames::SiteNotice );
            if ( !$notice ) {
                return false;
            }
        } else {
            $msg = $this->msg( $name )->inContentLanguage();
            if ( $msg->isBlank() ) {
                return '';
            } elseif ( $msg->isDisabled() ) {
                return false;
            }
            $notice = $msg->plain();
        }
 
        $services = MediaWikiServices::getInstance();
        $cache = $services->getMainWANObjectCache();
        $parsed = $cache->getWithSetCallback(
            // Use the extra hash appender to let eg SSL variants separately cache
            // Key is verified with md5 hash of unparsed wikitext
            $cache->makeKey(
                $name, $config->get( MainConfigNames::RenderHashAppend ), md5( $notice ) ),
            // TTL in seconds
            600,
            function () use ( $notice ) {
                return $this->getOutput()->parseAsInterface( $notice );
            }
        );
 
        $contLang = $services->getContentLanguage();
        return Html::rawElement(
            'div',
            [
                'class' => $name,
                'lang' => $contLang->getHtmlCode(),
                'dir' => $contLang->getDir()
            ],
            $parsed
        );
    }
 
    public function getSiteNotice() {
        $siteNotice = '';
 
        if ( $this->getHookRunner()->onSiteNoticeBefore( $siteNotice, $this ) ) {
            if ( $this->getUser()->isRegistered() ) {
                $siteNotice = $this->getCachedNotice( 'sitenotice' );
            } else {
                $anonNotice = $this->getCachedNotice( 'anonnotice' );
                if ( $anonNotice === false ) {
                    $siteNotice = $this->getCachedNotice( 'sitenotice' );
                } else {
                    $siteNotice = $anonNotice;
                }
            }
            if ( $siteNotice === false ) {
                $siteNotice = $this->getCachedNotice( 'default' ) ?: '';
            }
            if ( $this->canUseWikiPage() ) {
                $ns = $this->getWikiPage()->getNamespace();
                $nsNotice = $this->getCachedNotice( "namespacenotice-$ns" );
                if ( $nsNotice ) {
                    $siteNotice .= $nsNotice;
                }
            }
            if ( $siteNotice !== '' ) {
                $siteNotice = Html::rawElement( 'div', [ 'id' => 'localNotice', 'data-nosnippet' => '' ], $siteNotice );
            }
        }
 
        $this->getHookRunner()->onSiteNoticeAfter( $siteNotice, $this );
        $siteNotice = $this->getEmailConfirmationNotice() . $siteNotice;
        if ( $this->getOptions()[ 'wrapSiteNotice' ] ) {
            $siteNotice = Html::rawElement( 'div', [ 'id' => 'siteNotice' ], $siteNotice );
        }
        return $siteNotice;
    }
 
    public function doEditSectionLink( Title $nt, $section, $sectionTitle, Language $lang ) {
        // HTML generated here should probably have userlangattributes
        // added to it for LTR text on RTL pages
 
        $attribs = [];
        $attribs['title'] = $this->msg( 'editsectionhint' )->plaintextParams( $sectionTitle )
            ->inLanguage( $lang )->text();
 
        $links = [
            'editsection' => [
                'icon' => 'edit',
                'text' => $this->msg( 'editsection' )->inLanguage( $lang )->text(),
                'targetTitle' => $nt,
                'attribs' => $attribs,
                'query' => [ 'action' => 'edit', 'section' => $section ]
            ]
        ];
 
        $this->getHookRunner()->onSkinEditSectionLinks( $this, $nt, $section, $sectionTitle, $links, $lang );
 
        $linkRenderer = MediaWikiServices::getInstance()->getLinkRenderer();
        $newLinks = [];
        $options = $this->defaultLinkOptions + [
            'class-as-property' => true,
        ];
        $ctx = $this->getContext();
        foreach ( $links as $key => $linkDetails ) {
            $targetTitle = $linkDetails['targetTitle'];
            $attrs = $linkDetails['attribs'];
            $query = $linkDetails['query'];
            unset( $linkDetails['targetTitle'] );
            unset( $linkDetails['query'] );
            unset( $linkDetails['attribs'] );
            unset( $linkDetails['options' ] );
            $component = new SkinComponentLink(
                $key, $linkDetails + [
                    'href' => Title::newFromLinkTarget( $targetTitle )->getLinkURL( $query, false ),
                ] + $attrs, $ctx, $options
            );
            $newLinks[] = $component->getTemplateData();
        }
        return $this->doEditSectionLinksHTML( $newLinks, $lang );
    }
 
    protected function doEditSectionLinksHTML( array $links, Language $lang ) {
        $result = Html::openElement( 'span', [ 'class' => 'mw-editsection' ] );
        $result .= Html::rawElement( 'span', [ 'class' => 'mw-editsection-bracket' ], '[' );
 
        $linksHtml = array_column( $links, 'html' );
 
        if ( count( $linksHtml ) === 1 ) {
            $result .= $linksHtml[0];
        } else {
            $result .= implode(
                Html::element( 'span',
                    [ 'class' => 'mw-editsection-divider' ],
                    $this->msg( 'pipe-separator' )->inLanguage( $lang )->text()
                ),
                $linksHtml
            );
        }
 
        $result .= Html::rawElement( 'span', [ 'class' => 'mw-editsection-bracket' ], ']' );
        $result .= Html::closeElement( 'span' );
        return $result;
    }
 
    public function makeToolbox( $navUrls, $feedUrls ) {
        $toolbox = [];
        if ( $navUrls['whatlinkshere'] ?? null ) {
            $toolbox['whatlinkshere'] = $navUrls['whatlinkshere'];
            $toolbox['whatlinkshere']['id'] = 't-whatlinkshere';
            $toolbox['whatlinkshere']['icon'] = 'articleRedirect';
        }
        if ( $navUrls['recentchangeslinked'] ?? null ) {
            $toolbox['recentchangeslinked'] = $navUrls['recentchangeslinked'];
            $toolbox['recentchangeslinked']['msg'] = 'recentchangeslinked-toolbox';
            $toolbox['recentchangeslinked']['id'] = 't-recentchangeslinked';
            $toolbox['recentchangeslinked']['rel'] = 'nofollow';
        }
        if ( $feedUrls ) {
            $toolbox['feeds']['id'] = 'feedlinks';
            $toolbox['feeds']['links'] = [];
            foreach ( $feedUrls as $key => $feed ) {
                $toolbox['feeds']['links'][$key] = $feed;
                $toolbox['feeds']['links'][$key]['id'] = "feed-$key";
                $toolbox['feeds']['links'][$key]['rel'] = 'alternate';
                $toolbox['feeds']['links'][$key]['type'] = "application/{$key}+xml";
                $toolbox['feeds']['links'][$key]['class'] = 'feedlink';
            }
        }
        foreach ( [ 'contributions', 'log', 'blockip', 'changeblockip', 'unblockip',
            'block-manage-blocks', 'emailuser', 'mute', 'userrights', 'upload' ] as $special
        ) {
            if ( $navUrls[$special] ?? null ) {
                $toolbox[$special] = $navUrls[$special];
                $toolbox[$special]['id'] = "t-$special";
            }
        }
        if ( $navUrls['print'] ?? null ) {
            $toolbox['print'] = $navUrls['print'];
            $toolbox['print']['id'] = 't-print';
            $toolbox['print']['rel'] = 'alternate';
            $toolbox['print']['msg'] = 'printableversion';
        }
        if ( $navUrls['permalink'] ?? null ) {
            $toolbox['permalink'] = $navUrls['permalink'];
            $toolbox['permalink']['id'] = 't-permalink';
        }
        if ( $navUrls['info'] ?? null ) {
            $toolbox['info'] = $navUrls['info'];
            $toolbox['info']['id'] = 't-info';
        }
 
        return $toolbox;
    }
 
    protected function getIndicatorsData( array $indicators ): array {
        $indicatorData = [];
        foreach ( $indicators as $id => $content ) {
            $indicatorData[] = [
                'id' => Sanitizer::escapeIdForAttribute( "mw-indicator-$id" ),
                'class' => 'mw-indicator',
                'html' => $content,
            ];
        }
        return $indicatorData;
    }
 
    final public function getPersonalToolsForMakeListItem( $urls, $applyClassesToListItems = false ) {
        $personal_tools = [];
        foreach ( $urls as $key => $plink ) {
            # The class on a personal_urls item is meant to go on the <a> instead
            # of the <li> so we have to use a single item "links" array instead
            # of using most of the personal_url's keys directly.
            $ptool = [
                'links' => [
                    [ 'single-id' => "pt-$key" ],
                ],
                'id' => "pt-$key",
                'icon' => $plink[ 'icon' ] ?? null,
            ];
            if ( $applyClassesToListItems && isset( $plink['class'] ) ) {
                $ptool['class'] = $plink['class'];
            }
            if ( isset( $plink['active'] ) ) {
                $ptool['active'] = $plink['active'];
            }
            // Set class for the link to link-class, when defined.
            // This allows newer notifications content navigation to retain their classes
            // when merged back into the personal tools.
            // Doing this here allows the loop below to overwrite the class if defined directly.
            if ( isset( $plink['link-class'] ) ) {
                $ptool['links'][0]['class'] = $plink['link-class'];
            }
            $props = [
                'href',
                'text',
                'dir',
                'data',
                'exists',
                // @todo: Remove data-mw once migration from data-mw to data-mw-interface is complete.
                // this should probably go through the deprecation process for 3rd party support.
                'data-mw',
                'data-mw-interface',
                'link-html',
            ];
            if ( !$applyClassesToListItems ) {
                $props[] = 'class';
            }
            foreach ( $props as $k ) {
                if ( isset( $plink[$k] ) ) {
                    $ptool['links'][0][$k] = $plink[$k];
                }
            }
            $personal_tools[$key] = $ptool;
        }
        return $personal_tools;
    }
 
    final public function makeLink( $key, $item, $linkOptions = [] ) {
        $options = $linkOptions + $this->defaultLinkOptions;
        $component = new SkinComponentLink(
            $key, $item, $this->getContext(), $options
        );
        return $component->getTemplateData()[ 'html' ];
    }
 
    final public function makeListItem( $key, $item, $options = [] ) {
        $component = new SkinComponentListItem(
            $key, $item, $this->getContext(), $options, $this->defaultLinkOptions
        );
        return $component->getTemplateData()[ 'html-item' ];
    }
 
    public function getAfterPortlet( string $name ): string {
        $html = '';
 
        if ( $name === 'user-page' && $this->getUser()->isTemp() ) {
            $html .= Html::rawElement( 'div', [ 'class' => 'mw-temp-user-banner-tooltip' ],
                Html::rawElement( 'button', [
                    'id' => 'mw-temp-user-banner-tooltip-button',
                    'class' => 'mw-temp-user-banner-tooltip-summary cdx-button '
                        . 'cdx-button--icon-only cdx-button--weight-quiet',
                    'aria-label' => $this->msg( 'temp-user-banner-tooltip-label' )->text(),
                    'data-event-name' => 'temp-user-banner.info',
                ],
                    Html::element( 'span', [ 'class' => 'mw-temp-user-banner-tooltip-icon' ] )
                )
            );
        }
 
        $this->getHookRunner()->onSkinAfterPortlet( $this, $name, $html );
 
        return $html;
    }
 
    final public function prepareSubtitle( bool $withContainer = true ) {
        $out = $this->getOutput();
        $subpagestr = $this->subPageSubtitleInternal();
        if ( $subpagestr !== '' ) {
            $subpagestr = Html::rawElement( 'div', [ 'class' => 'subpages' ], $subpagestr );
        }
        $html = $subpagestr . $out->getSubtitle();
        return $withContainer ? Html::rawElement( 'div', [
            'id' => 'mw-content-subtitle',
        ] + $this->getUserLanguageAttributes(), $html ) : $html;
    }
 
    protected function getJsConfigVars(): array {
        return [];
    }
 
    final protected function getUserLanguageAttributes() {
        $userLang = $this->getLanguage();
        $userLangCode = $userLang->getHtmlCode();
        $userLangDir = $userLang->getDir();
        $contLang = MediaWikiServices::getInstance()->getContentLanguage();
        if (
            $userLangCode !== $contLang->getHtmlCode() ||
            $userLangDir !== $contLang->getDir()
        ) {
            return [
                'lang' => $userLangCode,
                'dir' => $userLangDir,
            ];
        }
        return [];
    }
 
    final protected function prepareUserLanguageAttributes() {
        return Html::expandAttributes(
            $this->getUserLanguageAttributes()
        );
    }
 
    final protected function prepareUndeleteLink() {
        $undelete = $this->getUndeleteLink();
        return $undelete === '' ? null : '<div class="subpages">' . $undelete . '</div>';
    }
 
    protected function wrapHTML( $title, $html ) {
        // This wraps the "real" body content (i.e. parser output or special page).
        // On page views, elements like categories and contentSub are outside of this.
        return Html::rawElement( 'div', [
            'id' => 'mw-content-text',
            'class' => [
                'mw-body-content',
            ],
        ], $html );
    }
 
    final public function getOptions(): array {
        return $this->options + [
            'styles' => [],
            'scripts' => [],
            'toc' => true,
            'format' => 'html',
            'bodyClasses' => [],
            'clientPrefEnabled' => false,
            'responsive' => false,
            'link' => [],
            'tempUserBanner' => false,
            'wrapSiteNotice' => false,
            'menus' => [
                // Legacy keys that are enabled by default for backwards compatibility
                'namespaces',
                'views',
                'actions',
                'variants',
                'personal',
                // Opt-in menus
                // * 'associated-pages'
                // * 'notifications'
                // * 'user-interface-preferences',
                // * 'user-page',
                // * 'user-menu',
            ]
        ];
    }
 
    public function supportsMenu( string $menu ): bool {
        $options = $this->getOptions();
        return in_array( $menu, $options['menus'] );
    }
 
    public static function getPortletLinkOptions( RL\Context $context ): array {
        $skinName = $context->getSkin();
        $skinFactory = MediaWikiServices::getInstance()->getSkinFactory();
        $options = $skinFactory->getSkinOptions( $skinName );
        $portletLinkOptions = $options['link'] ?? [];
        // Normalize link options to always have this key
        $portletLinkOptions += [ 'text-wrapper' => [] ];
        // Normalize text-wrapper to always be an array of arrays
        if ( isset( $portletLinkOptions['text-wrapper']['tag'] ) ) {
            $portletLinkOptions['text-wrapper'] = [ $portletLinkOptions['text-wrapper'] ];
        }
        return $portletLinkOptions;
    }
 
    final protected function getPortletData( string $name, array $items ): array {
        $portletComponent = new SkinComponentMenu(
            $name,
            $items,
            $this->getContext(),
            '',
            $this->defaultLinkOptions,
            $this->getAfterPortlet( $name )
        );
        return $portletComponent->getTemplateData();
    }
 
    public function getPageTarget() {
        $target = '';
        // Check if the target user is a valid user or IP
        $relUser = $this->getRelevantUser();
        if ( $relUser ) {
            $target = $relUser->getName();
        }
 
        // Otherwise, check if the target is an IP range which should also be supported
        if ( !$target ) {
            // Check for the target parameter first
            $pageTarget = trim( $this->getRequest()->getText( 'target' ) );
 
            // If it doesn't exist, check for the subpage next
            if ( !$pageTarget ) {
                $pageTarget = $this->getTitle()->getFullSubpageText();
            }
 
            // If it exists, only set the target if it's an IP range
            // as that's the only case not covered by Skin->getRelevantUser()
            if (
                $pageTarget &&
                IPUtils::isValidRange( $pageTarget )
            ) {
                $target = $pageTarget;
            }
        }
 
        return $target;
    }
}
 
class_alias( Skin::class, 'Skin' );