SkinTemplate.php

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<?php
use MediaWiki\Auth\AuthManager;
use MediaWiki\MediaWikiServices;
 
class SkinTemplate extends Skin {
    public $skinname = 'monobook';
 
    public $template = QuickTemplate::class;
 
    public $thispage;
    public $titletxt;
    public $userpage;
    public $thisquery;
    public $loggedin;
    public $username;
    public $userpageUrlDetails;
 
    function setupTemplate( $classname ) {
        return new $classname( $this->getConfig() );
    }
 
    public function getLanguages() {
        global $wgHideInterlanguageLinks;
        if ( $wgHideInterlanguageLinks ) {
            return [];
        }
 
        $userLang = $this->getLanguage();
        $languageLinks = [];
 
        foreach ( $this->getOutput()->getLanguageLinks() as $languageLinkText ) {
            $class = 'interlanguage-link interwiki-' . explode( ':', $languageLinkText, 2 )[0];
 
            $languageLinkTitle = Title::newFromText( $languageLinkText );
            if ( $languageLinkTitle ) {
                $ilInterwikiCode = $languageLinkTitle->getInterwiki();
                $ilLangName = Language::fetchLanguageName( $ilInterwikiCode );
 
                if ( strval( $ilLangName ) === '' ) {
                    $ilDisplayTextMsg = wfMessage( "interlanguage-link-$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->formatLanguageName( $ilLangName );
                }
 
                // CLDR extension or similar is required to localize the language name;
                // otherwise we'll end up with the autonym again.
                $ilLangLocalName = Language::fetchLanguageName(
                    $ilInterwikiCode,
                    $userLang->getCode()
                );
 
                $languageLinkTitleText = $languageLinkTitle->getText();
                if ( $ilLangLocalName === '' ) {
                    $ilFriendlySiteName = wfMessage( "interlanguage-link-sitename-$ilInterwikiCode" );
                    if ( !$ilFriendlySiteName->isDisabled() ) {
                        if ( $languageLinkTitleText === '' ) {
                            $ilTitle = wfMessage(
                                'interlanguage-link-title-nonlangonly',
                                $ilFriendlySiteName->text()
                            )->text();
                        } else {
                            $ilTitle = wfMessage(
                                '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 = wfMessage(
                        'interlanguage-link-title-langonly',
                        $ilLangLocalName
                    )->text();
                } else {
                    $ilTitle = wfMessage(
                        'interlanguage-link-title',
                        $languageLinkTitleText,
                        $ilLangLocalName
                    )->text();
                }
 
                $ilInterwikiCodeBCP47 = LanguageCode::bcp47( $ilInterwikiCode );
                $languageLink = [
                    'href' => $languageLinkTitle->getFullURL(),
                    'text' => $ilLangName,
                    'title' => $ilTitle,
                    'class' => $class,
                    'link-class' => 'interlanguage-link-target',
                    'lang' => $ilInterwikiCodeBCP47,
                    'hreflang' => $ilInterwikiCodeBCP47,
                ];
                Hooks::run(
                    'SkinTemplateGetLanguageLink',
                    [ &$languageLink, $languageLinkTitle, $this->getTitle(), $this->getOutput() ]
                );
                $languageLinks[] = $languageLink;
            }
        }
 
        return $languageLinks;
    }
 
    protected function setupTemplateForOutput() {
        $request = $this->getRequest();
        $user = $this->getUser();
        $title = $this->getTitle();
 
        $tpl = $this->setupTemplate( $this->template );
 
        $this->thispage = $title->getPrefixedDBkey();
        $this->titletxt = $title->getPrefixedText();
        $this->userpage = $user->getUserPage()->getPrefixedText();
        $query = [];
        if ( !$request->wasPosted() ) {
            $query = $request->getValues();
            unset( $query['title'] );
            unset( $query['returnto'] );
            unset( $query['returntoquery'] );
        }
        $this->thisquery = wfArrayToCgi( $query );
        $this->loggedin = $user->isLoggedIn();
        $this->username = $user->getName();
 
        if ( $this->loggedin ) {
            $this->userpageUrlDetails = self::makeUrlDetails( $this->userpage );
        } else {
            # This won't be used in the standard skins, but we define it to preserve the interface
            # To save time, we check for existence
            $this->userpageUrlDetails = self::makeKnownUrlDetails( $this->userpage );
        }
 
        return $tpl;
    }
 
    function outputPage() {
        Profiler::instance()->setAllowOutput();
        $out = $this->getOutput();
 
        $this->initPage( $out );
        $tpl = $this->prepareQuickTemplate();
        // execute template
        $res = $tpl->execute();
 
        // result may be an error
        $this->printOrError( $res );
    }
 
    protected function wrapHTML( $title, $html ) {
        # An ID that includes the actual body text; without categories, contentSub, ...
        $realBodyAttribs = [ 'id' => 'mw-content-text' ];
 
        # Add a mw-content-ltr/rtl class to be able to style based on text
        # direction when the content is different from the UI language (only
        # when viewing)
        # Most information on special pages and file pages is in user language,
        # rather than content language, so those will not get this
        if ( Action::getActionName( $this ) === 'view' &&
            ( !$title->inNamespaces( NS_SPECIAL, NS_FILE ) || $title->isRedirect() ) ) {
            $pageLang = $title->getPageViewLanguage();
            $realBodyAttribs['lang'] = $pageLang->getHtmlCode();
            $realBodyAttribs['dir'] = $pageLang->getDir();
            $realBodyAttribs['class'] = 'mw-content-' . $pageLang->getDir();
        }
 
        return Html::rawElement( 'div', $realBodyAttribs, $html );
    }
 
    protected function prepareQuickTemplate() {
        global $wgScript, $wgStylePath, $wgMimeType,
            $wgSitename, $wgLogo, $wgMaxCredits,
            $wgShowCreditsIfMax, $wgArticlePath,
            $wgScriptPath, $wgServer;
 
        $title = $this->getTitle();
        $request = $this->getRequest();
        $out = $this->getOutput();
        $tpl = $this->setupTemplateForOutput();
 
        $tpl->set( 'title', $out->getPageTitle() );
        $tpl->set( 'pagetitle', $out->getHTMLTitle() );
        $tpl->set( 'displaytitle', $out->mPageLinkTitle );
 
        $tpl->set( 'thispage', $this->thispage );
        $tpl->set( 'titleprefixeddbkey', $this->thispage );
        $tpl->set( 'titletext', $title->getText() );
        $tpl->set( 'articleid', $title->getArticleID() );
 
        $tpl->set( 'isarticle', $out->isArticle() );
 
        $subpagestr = $this->subPageSubtitle();
        if ( $subpagestr !== '' ) {
            $subpagestr = '<span class="subpages">' . $subpagestr . '</span>';
        }
        $tpl->set( 'subtitle', $subpagestr . $out->getSubtitle() );
 
        $undelete = $this->getUndeleteLink();
        if ( $undelete === '' ) {
            $tpl->set( 'undelete', '' );
        } else {
            $tpl->set( 'undelete', '<span class="subpages">' . $undelete . '</span>' );
        }
 
        $tpl->set( 'catlinks', $this->getCategories() );
        if ( $out->isSyndicated() ) {
            $feeds = [];
            foreach ( $out->getSyndicationLinks() as $format => $link ) {
                $feeds[$format] = [
                    // Messages: feed-atom, feed-rss
                    'text' => $this->msg( "feed-$format" )->text(),
                    'href' => $link
                ];
            }
            $tpl->set( 'feeds', $feeds );
        } else {
            $tpl->set( 'feeds', false );
        }
 
        $tpl->set( 'mimetype', $wgMimeType );
        $tpl->set( 'charset', 'UTF-8' );
        $tpl->set( 'wgScript', $wgScript );
        $tpl->set( 'skinname', $this->skinname );
        $tpl->set( 'skinclass', static::class );
        $tpl->set( 'skin', $this );
        $tpl->set( 'stylename', $this->stylename );
        $tpl->set( 'printable', $out->isPrintable() );
        $tpl->set( 'handheld', $request->getBool( 'handheld' ) );
        $tpl->set( 'loggedin', $this->loggedin );
        $tpl->set( 'notspecialpage', !$title->isSpecialPage() );
        $tpl->set( 'searchaction', $this->getSearchLink() );
        $tpl->set( 'searchtitle', SpecialPage::getTitleFor( 'Search' )->getPrefixedDBkey() );
        $tpl->set( 'search', trim( $request->getVal( 'search' ) ) );
        $tpl->set( 'stylepath', $wgStylePath );
        $tpl->set( 'articlepath', $wgArticlePath );
        $tpl->set( 'scriptpath', $wgScriptPath );
        $tpl->set( 'serverurl', $wgServer );
        $tpl->set( 'logopath', $wgLogo );
        $tpl->set( 'sitename', $wgSitename );
 
        $userLang = $this->getLanguage();
        $userLangCode = $userLang->getHtmlCode();
        $userLangDir = $userLang->getDir();
 
        $tpl->set( 'lang', $userLangCode );
        $tpl->set( 'dir', $userLangDir );
        $tpl->set( 'rtl', $userLang->isRTL() );
 
        $tpl->set( 'capitalizeallnouns', $userLang->capitalizeAllNouns() ? ' capitalize-all-nouns' : '' );
        $tpl->set( 'showjumplinks', true ); // showjumplinks preference has been removed
        $tpl->set( 'username', $this->loggedin ? $this->username : null );
        $tpl->set( 'userpage', $this->userpage );
        $tpl->set( 'userpageurl', $this->userpageUrlDetails['href'] );
        $tpl->set( 'userlang', $userLangCode );
 
        // Users can have their language set differently than the
        // content of the wiki. For these users, tell the web browser
        // that interface elements are in a different language.
        $tpl->set( 'userlangattributes', '' );
        $tpl->set( 'specialpageattributes', '' ); # obsolete
        // Used by VectorBeta to insert HTML before content but after the
        // heading for the page title. Defaults to empty string.
        $tpl->set( 'prebodyhtml', '' );
 
        $contLang = MediaWikiServices::getInstance()->getContentLanguage();
        if (
            $userLangCode !== $contLang->getHtmlCode() ||
            $userLangDir !== $contLang->getDir()
        ) {
            $escUserlang = htmlspecialchars( $userLangCode );
            $escUserdir = htmlspecialchars( $userLangDir );
            // Attributes must be in double quotes because htmlspecialchars() doesn't
            // escape single quotes
            $attrs = " lang=\"$escUserlang\" dir=\"$escUserdir\"";
            $tpl->set( 'userlangattributes', $attrs );
        }
 
        $tpl->set( 'newtalk', $this->getNewtalks() );
        $tpl->set( 'logo', $this->logoText() );
 
        $tpl->set( 'copyright', false );
        // No longer used
        $tpl->set( 'viewcount', false );
        $tpl->set( 'lastmod', false );
        $tpl->set( 'credits', false );
        $tpl->set( 'numberofwatchingusers', false );
        if ( $title->exists() ) {
            if ( $out->isArticle() && $out->isRevisionCurrent() ) {
                if ( $wgMaxCredits != 0 ) {
                    $action = Action::factory(
                        'credits', $this->getWikiPage(), $this->getContext() );
                    '@phan-var CreditsAction $action';
                    $tpl->set( 'credits',
                        $action->getCredits( $wgMaxCredits, $wgShowCreditsIfMax ) );
                } else {
                    $tpl->set( 'lastmod', $this->lastModified() );
                }
            }
            if ( $out->showsCopyright() ) {
                $tpl->set( 'copyright', $this->getCopyright() );
            }
        }
 
        $tpl->set( 'copyrightico', $this->getCopyrightIcon() );
        $tpl->set( 'poweredbyico', $this->getPoweredBy() );
        $tpl->set( 'disclaimer', $this->disclaimerLink() );
        $tpl->set( 'privacy', $this->privacyLink() );
        $tpl->set( 'about', $this->aboutLink() );
 
        $tpl->set( 'footerlinks', [
            'info' => [
                'lastmod',
                'numberofwatchingusers',
                'credits',
                'copyright',
            ],
            'places' => [
                'privacy',
                'about',
                'disclaimer',
            ],
        ] );
 
        global $wgFooterIcons;
        $tpl->set( 'footericons', $wgFooterIcons );
        foreach ( $tpl->data['footericons'] as $footerIconsKey => &$footerIconsBlock ) {
            if ( count( $footerIconsBlock ) > 0 ) {
                foreach ( $footerIconsBlock as &$footerIcon ) {
                    if ( isset( $footerIcon['src'] ) ) {
                        if ( !isset( $footerIcon['width'] ) ) {
                            $footerIcon['width'] = 88;
                        }
                        if ( !isset( $footerIcon['height'] ) ) {
                            $footerIcon['height'] = 31;
                        }
                    }
                }
            } else {
                unset( $tpl->data['footericons'][$footerIconsKey] );
            }
        }
 
        $tpl->set( 'indicators', $out->getIndicators() );
 
        $tpl->set( 'sitenotice', $this->getSiteNotice() );
        $tpl->set( 'printfooter', $this->printSource() );
        // Wrap the bodyText with #mw-content-text element
        $out->mBodytext = $this->wrapHTML( $title, $out->mBodytext );
        $tpl->set( 'bodytext', $out->mBodytext );
 
        $language_urls = $this->getLanguages();
        if ( count( $language_urls ) ) {
            $tpl->set( 'language_urls', $language_urls );
        } else {
            $tpl->set( 'language_urls', false );
        }
 
        # Personal toolbar
        $tpl->set( 'personal_urls', $this->buildPersonalUrls() );
        $content_navigation = $this->buildContentNavigationUrls();
        $content_actions = $this->buildContentActionUrls( $content_navigation );
        $tpl->set( 'content_navigation', $content_navigation );
        $tpl->set( 'content_actions', $content_actions );
 
        $tpl->set( 'sidebar', $this->buildSidebar() );
        $tpl->set( 'nav_urls', $this->buildNavUrls() );
 
        // Do this last in case hooks above add bottom scripts
        $tpl->set( 'bottomscripts', $this->bottomScripts() );
 
        // Set the head scripts near the end, in case the above actions resulted in added scripts
        $tpl->set( 'headelement', $out->headElement( $this ) );
 
        $tpl->set( 'debug', '' );
        $tpl->set( 'debughtml', $this->generateDebugHTML() );
        $tpl->set( 'reporttime', wfReportTime( $out->getCSPNonce() ) );
 
        // Avoid PHP 7.1 warning of passing $this by reference
        $skinTemplate = $this;
        // original version by hansm
        if ( !Hooks::run( 'SkinTemplateOutputPageBeforeExec', [ &$skinTemplate, &$tpl ] ) ) {
            wfDebug( __METHOD__ . ": Hook SkinTemplateOutputPageBeforeExec broke outputPage execution!\n" );
        }
 
        // Set the bodytext to another key so that skins can just output it on its own
        // and output printfooter and debughtml separately
        $tpl->set( 'bodycontent', $tpl->data['bodytext'] );
 
        // Append printfooter and debughtml onto bodytext so that skins that
        // were already using bodytext before they were split out don't suddenly
        // start not outputting information.
        $tpl->data['bodytext'] .= Html::rawElement(
            'div',
            [ 'class' => 'printfooter' ],
            "\n{$tpl->data['printfooter']}"
        ) . "\n";
        $tpl->data['bodytext'] .= $tpl->data['debughtml'];
 
        // allow extensions adding stuff after the page content.
        // See Skin::afterContentHook() for further documentation.
        $tpl->set( 'dataAfterContent', $this->afterContentHook() );
 
        return $tpl;
    }
 
    public function getPersonalToolsList() {
        return $this->makePersonalToolsList();
    }
 
    public function makePersonalToolsList( $personalTools = null, $options = [] ) {
        $tpl = $this->setupTemplateForOutput();
        $tpl->set( 'personal_urls', $this->buildPersonalUrls() );
        $html = '';
 
        if ( $personalTools === null ) {
            $personalTools = ( $tpl instanceof BaseTemplate )
                ? $tpl->getPersonalTools()
                : [];
        }
 
        foreach ( $personalTools as $key => $item ) {
            $html .= $tpl->makeListItem( $key, $item, $options );
        }
 
        return $html;
    }
 
    public function getStructuredPersonalTools() {
        $tpl = $this->setupTemplateForOutput();
        $tpl->set( 'personal_urls', $this->buildPersonalUrls() );
 
        return ( $tpl instanceof BaseTemplate ) ? $tpl->getPersonalTools() : [];
    }
 
    function formatLanguageName( $name ) {
        return $this->getLanguage()->ucfirst( $name );
    }
 
    function printOrError( $str ) {
        echo $str;
    }
 
    function useCombinedLoginLink() {
        global $wgUseCombinedLoginLink;
        return $wgUseCombinedLoginLink;
    }
 
    protected function buildPersonalUrls() {
        $title = $this->getTitle();
        $request = $this->getRequest();
        $pageurl = $title->getLocalURL();
        $authManager = AuthManager::singleton();
        $permissionManager = MediaWikiServices::getInstance()->getPermissionManager();
 
        /* set up the default links for the personal toolbar */
        $personal_urls = [];
 
        # Due to T34276, if a user does not have read permissions,
        # $this->getTitle() will just give Special:Badtitle, which is
        # not especially useful as a returnto parameter. Use the title
        # from the request instead, if there was one.
        if ( $permissionManager->userHasRight( $this->getUser(), 'read' ) ) {
            $page = $this->getTitle();
        } else {
            $page = Title::newFromText( $request->getVal( 'title', '' ) );
        }
        $page = $request->getVal( 'returnto', $page );
        $returnto = [];
        if ( strval( $page ) !== '' ) {
            $returnto['returnto'] = $page;
            $query = $request->getVal( 'returntoquery', $this->thisquery );
            $paramsArray = wfCgiToArray( $query );
            $query = wfArrayToCgi( $paramsArray );
            if ( $query != '' ) {
                $returnto['returntoquery'] = $query;
            }
        }
 
        if ( $this->loggedin ) {
            $personal_urls['userpage'] = [
                'text' => $this->username,
                'href' => &$this->userpageUrlDetails['href'],
                'class' => $this->userpageUrlDetails['exists'] ? false : 'new',
                'exists' => $this->userpageUrlDetails['exists'],
                'active' => ( $this->userpageUrlDetails['href'] == $pageurl ),
                'dir' => 'auto'
            ];
            $usertalkUrlDetails = $this->makeTalkUrlDetails( $this->userpage );
            $personal_urls['mytalk'] = [
                'text' => $this->msg( 'mytalk' )->text(),
                'href' => &$usertalkUrlDetails['href'],
                'class' => $usertalkUrlDetails['exists'] ? false : 'new',
                'exists' => $usertalkUrlDetails['exists'],
                'active' => ( $usertalkUrlDetails['href'] == $pageurl )
            ];
            $href = self::makeSpecialUrl( 'Preferences' );
            $personal_urls['preferences'] = [
                'text' => $this->msg( 'mypreferences' )->text(),
                'href' => $href,
                'active' => ( $href == $pageurl )
            ];
 
            if ( $permissionManager->userHasRight( $this->getUser(), 'viewmywatchlist' ) ) {
                $href = self::makeSpecialUrl( 'Watchlist' );
                $personal_urls['watchlist'] = [
                    'text' => $this->msg( 'mywatchlist' )->text(),
                    'href' => $href,
                    'active' => ( $href == $pageurl )
                ];
            }
 
            # We need to do an explicit check for Special:Contributions, as we
            # have to match both the title, and the target, which could come
            # from request values (Special:Contributions?target=Jimbo_Wales)
            # or be specified in "sub page" form
            # (Special:Contributions/Jimbo_Wales). The plot
            # thickens, because the Title object is altered for special pages,
            # so it doesn't contain the original alias-with-subpage.
            $origTitle = Title::newFromText( $request->getText( 'title' ) );
            if ( $origTitle instanceof Title && $origTitle->isSpecialPage() ) {
                list( $spName, $spPar ) =
                    MediaWikiServices::getInstance()->getSpecialPageFactory()->
                        resolveAlias( $origTitle->getText() );
                $active = $spName == 'Contributions'
                    && ( ( $spPar && $spPar == $this->username )
                        || $request->getText( 'target' ) == $this->username );
            } else {
                $active = false;
            }
 
            $href = self::makeSpecialUrlSubpage( 'Contributions', $this->username );
            $personal_urls['mycontris'] = [
                'text' => $this->msg( 'mycontris' )->text(),
                'href' => $href,
                'active' => $active
            ];
 
            // if we can't set the user, we can't unset it either
            if ( $request->getSession()->canSetUser() ) {
                $personal_urls['logout'] = [
                    'text' => $this->msg( 'pt-userlogout' )->text(),
                    'href' => self::makeSpecialUrl( 'Userlogout',
                        // Note: userlogout link must always contain an & character, otherwise we might not be able
                        // to detect a buggy precaching proxy (T19790)
                        ( $title->isSpecial( 'Preferences' ) ? [] : $returnto ) ),
                    'active' => false
                ];
            }
        } else {
            $useCombinedLoginLink = $this->useCombinedLoginLink();
            if ( !$authManager->canCreateAccounts() || !$authManager->canAuthenticateNow() ) {
                // don't show combined login/signup link if one of those is actually not available
                $useCombinedLoginLink = false;
            }
 
            $loginlink = $permissionManager->userHasRight( $this->getUser(), 'createaccount' )
                         && $useCombinedLoginLink ? 'nav-login-createaccount' : 'pt-login';
 
            $login_url = [
                'text' => $this->msg( $loginlink )->text(),
                'href' => self::makeSpecialUrl( 'Userlogin', $returnto ),
                'active' => $title->isSpecial( 'Userlogin' )
                    || $title->isSpecial( 'CreateAccount' ) && $useCombinedLoginLink,
            ];
            $createaccount_url = [
                'text' => $this->msg( 'pt-createaccount' )->text(),
                'href' => self::makeSpecialUrl( 'CreateAccount', $returnto ),
                'active' => $title->isSpecial( 'CreateAccount' ),
            ];
 
            // No need to show Talk and Contributions to anons if they can't contribute!
            if ( $permissionManager->groupHasPermission( '*', 'edit' ) ) {
                // Because of caching, we can't link directly to the IP talk and
                // contributions pages. Instead we use the special page shortcuts
                // (which work correctly regardless of caching). This means we can't
                // determine whether these links are active or not, but since major
                // skins (MonoBook, Vector) don't use this information, it's not a
                // huge loss.
                $personal_urls['anontalk'] = [
                    'text' => $this->msg( 'anontalk' )->text(),
                    'href' => self::makeSpecialUrlSubpage( 'Mytalk', false ),
                    'active' => false
                ];
                $personal_urls['anoncontribs'] = [
                    'text' => $this->msg( 'anoncontribs' )->text(),
                    'href' => self::makeSpecialUrlSubpage( 'Mycontributions', false ),
                    'active' => false
                ];
            }
 
            if (
                $authManager->canCreateAccounts()
                && $permissionManager->userHasRight( $this->getUser(), 'createaccount' )
                && !$useCombinedLoginLink
            ) {
                $personal_urls['createaccount'] = $createaccount_url;
            }
 
            if ( $authManager->canAuthenticateNow() ) {
                $key = $permissionManager->groupHasPermission( '*', 'read' )
                    ? 'login'
                    : 'login-private';
                $personal_urls[$key] = $login_url;
            }
        }
 
        Hooks::runWithoutAbort( 'PersonalUrls', [ &$personal_urls, &$title, $this ] );
        return $personal_urls;
    }
 
    function tabAction( $title, $message, $selected, $query = '', $checkEdit = false ) {
        $classes = [];
        if ( $selected ) {
            $classes[] = 'selected';
        }
        $exists = true;
        if ( $checkEdit && !$title->isKnown() ) {
            $classes[] = 'new';
            $exists = false;
            if ( $query !== '' ) {
                $query = 'action=edit&redlink=1&' . $query;
            } else {
                $query = 'action=edit&redlink=1';
            }
        }
 
        $services = MediaWikiServices::getInstance();
        $linkClass = $services->getLinkRenderer()->getLinkClasses( $title );
 
        // wfMessageFallback will nicely accept $message as an array of fallbacks
        // or just a single key
        $msg = wfMessageFallback( $message )->setContext( $this->getContext() );
        if ( is_array( $message ) ) {
            // for hook compatibility just keep the last message name
            $message = end( $message );
        }
        if ( $msg->exists() ) {
            $text = $msg->text();
        } else {
            $text = $services->getContentLanguage()->getConverter()->
                convertNamespace( $services->getNamespaceInfo()->
                    getSubject( $title->getNamespace() ) );
        }
 
        // Avoid PHP 7.1 warning of passing $this by reference
        $skinTemplate = $this;
        $result = [];
        if ( !Hooks::run( 'SkinTemplateTabAction', [ &$skinTemplate,
                $title, $message, $selected, $checkEdit,
                &$classes, &$query, &$text, &$result ] ) ) {
            return $result;
        }
 
        $result = [
            'class' => implode( ' ', $classes ),
            'text' => $text,
            'href' => $title->getLocalURL( $query ),
            'exists' => $exists,
            'primary' => true ];
        if ( $linkClass !== '' ) {
            $result['link-class'] = $linkClass;
        }
 
        return $result;
    }
 
    function makeTalkUrlDetails( $name, $urlaction = '' ) {
        $title = Title::newFromText( $name );
        if ( !is_object( $title ) ) {
            throw new MWException( __METHOD__ . " given invalid pagename $name" );
        }
        $title = $title->getTalkPage();
        self::checkTitle( $title, $name );
        return [
            'href' => $title->getLocalURL( $urlaction ),
            'exists' => $title->isKnown(),
        ];
    }
 
    function makeArticleUrlDetails( $name, $urlaction = '' ) {
        $title = Title::newFromText( $name );
        $title = $title->getSubjectPage();
        self::checkTitle( $title, $name );
        return [
            'href' => $title->getLocalURL( $urlaction ),
            'exists' => $title->exists(),
        ];
    }
 
    protected function buildContentNavigationUrls() {
        global $wgDisableLangConversion;
 
        // Display tabs for the relevant title rather than always the title itself
        $title = $this->getRelevantTitle();
        $onPage = $title->equals( $this->getTitle() );
 
        $out = $this->getOutput();
        $request = $this->getRequest();
        $user = $this->getUser();
        $permissionManager = MediaWikiServices::getInstance()->getPermissionManager();
 
        $content_navigation = [
            'namespaces' => [],
            'views' => [],
            'actions' => [],
            'variants' => []
        ];
 
        // parameters
        $action = $request->getVal( 'action', 'view' );
 
        $userCanRead = $permissionManager->quickUserCan( 'read', $user, $title );
 
        // Avoid PHP 7.1 warning of passing $this by reference
        $skinTemplate = $this;
        $preventActiveTabs = false;
        Hooks::run( 'SkinTemplatePreventOtherActiveTabs', [ &$skinTemplate, &$preventActiveTabs ] );
 
        // Checks if page is some kind of content
        if ( $title->canExist() ) {
            // Gets page objects for the related namespaces
            $subjectPage = $title->getSubjectPage();
            $talkPage = $title->getTalkPage();
 
            // Determines if this is a talk page
            $isTalk = $title->isTalkPage();
 
            // Generates XML IDs from namespace names
            $subjectId = $title->getNamespaceKey( '' );
 
            if ( $subjectId == 'main' ) {
                $talkId = 'talk';
            } else {
                $talkId = "{$subjectId}_talk";
            }
 
            $skname = $this->skinname;
 
            // Adds namespace links
            $subjectMsg = [ "nstab-$subjectId" ];
            if ( $subjectPage->isMainPage() ) {
                array_unshift( $subjectMsg, 'mainpage-nstab' );
            }
            $content_navigation['namespaces'][$subjectId] = $this->tabAction(
                $subjectPage, $subjectMsg, !$isTalk && !$preventActiveTabs, '', $userCanRead
            );
            $content_navigation['namespaces'][$subjectId]['context'] = 'subject';
            $content_navigation['namespaces'][$talkId] = $this->tabAction(
                $talkPage, [ "nstab-$talkId", 'talk' ], $isTalk && !$preventActiveTabs, '', $userCanRead
            );
            $content_navigation['namespaces'][$talkId]['context'] = 'talk';
 
            if ( $userCanRead ) {
                // Adds "view" view link
                if ( $title->isKnown() ) {
                    $content_navigation['views']['view'] = $this->tabAction(
                        $isTalk ? $talkPage : $subjectPage,
                        [ "$skname-view-view", 'view' ],
                        ( $onPage && ( $action == 'view' || $action == 'purge' ) ), '', true
                    );
                    // signal to hide this from simple content_actions
                    $content_navigation['views']['view']['redundant'] = true;
                }
 
                $page = $this->canUseWikiPage() ? $this->getWikiPage() : false;
                $isRemoteContent = $page && !$page->isLocal();
 
                // If it is a non-local file, show a link to the file in its own repository
                // @todo abstract this for remote content that isn't a file
                if ( $isRemoteContent ) {
                    $content_navigation['views']['view-foreign'] = [
                        'class' => '',
                        'text' => wfMessageFallback( "$skname-view-foreign", 'view-foreign' )->
                            setContext( $this->getContext() )->
                            params( $page->getWikiDisplayName() )->text(),
                        'href' => $page->getSourceURL(),
                        'primary' => false,
                    ];
                }
 
                // Checks if user can edit the current page if it exists or create it otherwise
                if ( $permissionManager->quickUserCan( 'edit', $user, $title ) &&
                     ( $title->exists() ||
                         $permissionManager->quickUserCan( 'create', $user, $title ) )
                ) {
                    // Builds CSS class for talk page links
                    $isTalkClass = $isTalk ? ' istalk' : '';
                    // Whether the user is editing the page
                    $isEditing = $onPage && ( $action == 'edit' || $action == 'submit' );
                    // Whether to show the "Add a new section" tab
                    // Checks if this is a current rev of talk page and is not forced to be hidden
                    $showNewSection = !$out->forceHideNewSectionLink()
                        && ( ( $isTalk && $out->isRevisionCurrent() ) || $out->showNewSectionLink() );
                    $section = $request->getVal( 'section' );
 
                    if ( $title->exists()
                        || ( $title->getNamespace() == NS_MEDIAWIKI
                            && $title->getDefaultMessageText() !== false
                        )
                    ) {
                        $msgKey = $isRemoteContent ? 'edit-local' : 'edit';
                    } else {
                        $msgKey = $isRemoteContent ? 'create-local' : 'create';
                    }
                    $content_navigation['views']['edit'] = [
                        'class' => ( $isEditing && ( $section !== 'new' || !$showNewSection )
                            ? 'selected'
                            : ''
                        ) . $isTalkClass,
                        'text' => wfMessageFallback( "$skname-view-$msgKey", $msgKey )
                            ->setContext( $this->getContext() )->text(),
                        'href' => $title->getLocalURL( $this->editUrlOptions() ),
                        'primary' => !$isRemoteContent, // don't collapse this in vector
                    ];
 
                    // section link
                    if ( $showNewSection ) {
                        // Adds new section link
                        // $content_navigation['actions']['addsection']
                        $content_navigation['views']['addsection'] = [
                            'class' => ( $isEditing && $section == 'new' ) ? 'selected' : false,
                            'text' => wfMessageFallback( "$skname-action-addsection", 'addsection' )
                                ->setContext( $this->getContext() )->text(),
                            'href' => $title->getLocalURL( 'action=edit&section=new' )
                        ];
                    }
                // Checks if the page has some kind of viewable source content
                } elseif ( $title->hasSourceText() ) {
                    // Adds view source view link
                    $content_navigation['views']['viewsource'] = [
                        'class' => ( $onPage && $action == 'edit' ) ? 'selected' : false,
                        'text' => wfMessageFallback( "$skname-action-viewsource", 'viewsource' )
                            ->setContext( $this->getContext() )->text(),
                        'href' => $title->getLocalURL( $this->editUrlOptions() ),
                        'primary' => true, // don't collapse this in vector
                    ];
                }
 
                // Checks if the page exists
                if ( $title->exists() ) {
                    // Adds history view link
                    $content_navigation['views']['history'] = [
                        'class' => ( $onPage && $action == 'history' ) ? 'selected' : false,
                        'text' => wfMessageFallback( "$skname-view-history", 'history_short' )
                            ->setContext( $this->getContext() )->text(),
                        'href' => $title->getLocalURL( 'action=history' ),
                    ];
 
                    if ( $permissionManager->quickUserCan( 'delete', $user, $title ) ) {
                        $content_navigation['actions']['delete'] = [
                            'class' => ( $onPage && $action == 'delete' ) ? 'selected' : false,
                            'text' => wfMessageFallback( "$skname-action-delete", 'delete' )
                                ->setContext( $this->getContext() )->text(),
                            'href' => $title->getLocalURL( 'action=delete' )
                        ];
                    }
 
                    if ( $permissionManager->quickUserCan( 'move', $user, $title ) ) {
                        $moveTitle = SpecialPage::getTitleFor( 'Movepage', $title->getPrefixedDBkey() );
                        $content_navigation['actions']['move'] = [
                            'class' => $this->getTitle()->isSpecial( 'Movepage' ) ? 'selected' : false,
                            'text' => wfMessageFallback( "$skname-action-move", 'move' )
                                ->setContext( $this->getContext() )->text(),
                            'href' => $moveTitle->getLocalURL()
                        ];
                    }
                } else {
                    // article doesn't exist or is deleted
                    if ( $permissionManager->quickUserCan( 'deletedhistory', $user, $title ) ) {
                        $n = $title->isDeleted();
                        if ( $n ) {
                            $undelTitle = SpecialPage::getTitleFor( 'Undelete', $title->getPrefixedDBkey() );
                            // If the user can't undelete but can view deleted
                            // history show them a "View .. deleted" tab instead.
                            $msgKey = $permissionManager->quickUserCan( 'undelete',
                                $user, $title ) ? 'undelete' : 'viewdeleted';
                            $content_navigation['actions']['undelete'] = [
                                'class' => $this->getTitle()->isSpecial( 'Undelete' ) ? 'selected' : false,
                                'text' => wfMessageFallback( "$skname-action-$msgKey", "{$msgKey}_short" )
                                    ->setContext( $this->getContext() )->numParams( $n )->text(),
                                'href' => $undelTitle->getLocalURL()
                            ];
                        }
                    }
                }
 
                if ( $permissionManager->quickUserCan( 'protect', $user, $title ) &&
                     $title->getRestrictionTypes() &&
                     $permissionManager->getNamespaceRestrictionLevels( $title->getNamespace(), $user ) !== [ '' ]
                ) {
                    $mode = $title->isProtected() ? 'unprotect' : 'protect';
                    $content_navigation['actions'][$mode] = [
                        'class' => ( $onPage && $action == $mode ) ? 'selected' : false,
                        'text' => wfMessageFallback( "$skname-action-$mode", $mode )
                            ->setContext( $this->getContext() )->text(),
                        'href' => $title->getLocalURL( "action=$mode" )
                    ];
                }
 
                // Checks if the user is logged in
                if ( $this->loggedin && $permissionManager->userHasAllRights( $user,
                        'viewmywatchlist', 'editmywatchlist' )
                ) {
                    $mode = $user->isWatched( $title ) ? 'unwatch' : 'watch';
                    $content_navigation['actions'][$mode] = [
                        'class' => 'mw-watchlink ' . (
                            $onPage && ( $action == 'watch' || $action == 'unwatch' ) ? 'selected' : ''
                        ),
                        // uses 'watch' or 'unwatch' message
                        'text' => $this->msg( $mode )->text(),
                        'href' => $title->getLocalURL( [ 'action' => $mode ] ),
                        // Set a data-mw=interface attribute, which the mediawiki.page.ajax
                        // module will look for to make sure it's a trusted link
                        'data' => [
                            'mw' => 'interface',
                        ],
                    ];
                }
            }
 
            // Avoid PHP 7.1 warning of passing $this by reference
            $skinTemplate = $this;
            Hooks::runWithoutAbort(
                'SkinTemplateNavigation',
                [ &$skinTemplate, &$content_navigation ]
            );
 
            if ( $userCanRead && !$wgDisableLangConversion ) {
                $pageLang = $title->getPageLanguage();
                // Checks that language conversion is enabled and variants exist
                // And if it is not in the special namespace
                if ( $pageLang->hasVariants() ) {
                    // Gets list of language variants
                    $variants = $pageLang->getVariants();
                    // Gets preferred variant (note that user preference is
                    // only possible for wiki content language variant)
                    $preferred = $pageLang->getPreferredVariant();
                    if ( Action::getActionName( $this ) === 'view' ) {
                        $params = $request->getQueryValues();
                        unset( $params['title'] );
                    } else {
                        $params = [];
                    }
                    // Loops over each variant
                    foreach ( $variants as $code ) {
                        // Gets variant name from language code
                        $varname = $pageLang->getVariantname( $code );
                        // Appends variant link
                        $content_navigation['variants'][] = [
                            'class' => ( $code == $preferred ) ? 'selected' : false,
                            'text' => $varname,
                            'href' => $title->getLocalURL( [ 'variant' => $code ] + $params ),
                            'lang' => LanguageCode::bcp47( $code ),
                            'hreflang' => LanguageCode::bcp47( $code ),
                        ];
                    }
                }
            }
        } else {
            // If it's not content, it's got to be a special page
            $content_navigation['namespaces']['special'] = [
                'class' => 'selected',
                'text' => $this->msg( 'nstab-special' )->text(),
                'href' => $request->getRequestURL(), // @see: T4457, T4510
                'context' => 'subject'
            ];
 
            // Avoid PHP 7.1 warning of passing $this by reference
            $skinTemplate = $this;
            Hooks::runWithoutAbort( 'SkinTemplateNavigation::SpecialPage',
                [ &$skinTemplate, &$content_navigation ] );
        }
 
        // Avoid PHP 7.1 warning of passing $this by reference
        $skinTemplate = $this;
        // Equiv to SkinTemplateContentActions
        Hooks::runWithoutAbort( 'SkinTemplateNavigation::Universal',
            [ &$skinTemplate, &$content_navigation ] );
 
        // Setup xml ids and tooltip info
        foreach ( $content_navigation as $section => &$links ) {
            foreach ( $links as $key => &$link ) {
                $xmlID = $key;
                if ( isset( $link['context'] ) && $link['context'] == 'subject' ) {
                    $xmlID = 'ca-nstab-' . $xmlID;
                } elseif ( isset( $link['context'] ) && $link['context'] == 'talk' ) {
                    $xmlID = 'ca-talk';
                    $link['rel'] = 'discussion';
                } elseif ( $section == 'variants' ) {
                    $xmlID = 'ca-varlang-' . $xmlID;
                } else {
                    $xmlID = 'ca-' . $xmlID;
                }
                $link['id'] = $xmlID;
            }
        }
 
        # We don't want to give the watch tab an accesskey if the
        # page is being edited, because that conflicts with the
        # accesskey on the watch checkbox.  We also don't want to
        # give the edit tab an accesskey, because that's fairly
        # superfluous and conflicts with an accesskey (Ctrl-E) often
        # used for editing in Safari.
        if ( in_array( $action, [ 'edit', 'submit' ] ) ) {
            if ( isset( $content_navigation['views']['edit'] ) ) {
                $content_navigation['views']['edit']['tooltiponly'] = true;
            }
            if ( isset( $content_navigation['actions']['watch'] ) ) {
                $content_navigation['actions']['watch']['tooltiponly'] = true;
            }
            if ( isset( $content_navigation['actions']['unwatch'] ) ) {
                $content_navigation['actions']['unwatch']['tooltiponly'] = true;
            }
        }
 
        return $content_navigation;
    }
 
    private function buildContentActionUrls( $content_navigation ) {
        // content_actions has been replaced with content_navigation for backwards
        // compatibility and also for skins that just want simple tabs content_actions
        // is now built by flattening the content_navigation arrays into one
 
        $content_actions = [];
 
        foreach ( $content_navigation as $links ) {
            foreach ( $links as $key => $value ) {
                if ( isset( $value['redundant'] ) && $value['redundant'] ) {
                    // Redundant tabs are dropped from content_actions
                    continue;
                }
 
                // content_actions used to have ids built using the "ca-$key" pattern
                // so the xmlID based id is much closer to the actual $key that we want
                // for that reason we'll just strip out the ca- if present and use
                // the latter potion of the "id" as the $key
                if ( isset( $value['id'] ) && substr( $value['id'], 0, 3 ) == 'ca-' ) {
                    $key = substr( $value['id'], 3 );
                }
 
                if ( isset( $content_actions[$key] ) ) {
                    wfDebug( __METHOD__ . ": Found a duplicate key for $key while flattening " .
                        "content_navigation into content_actions.\n" );
                    continue;
                }
 
                $content_actions[$key] = $value;
            }
        }
 
        return $content_actions;
    }
 
    protected function buildNavUrls() {
        global $wgUploadNavigationUrl;
 
        $out = $this->getOutput();
        $request = $this->getRequest();
 
        $nav_urls = [];
        $nav_urls['mainpage'] = [ 'href' => self::makeMainPageUrl() ];
        if ( $wgUploadNavigationUrl ) {
            $nav_urls['upload'] = [ 'href' => $wgUploadNavigationUrl ];
        } elseif ( UploadBase::isEnabled() && UploadBase::isAllowed( $this->getUser() ) === true ) {
            $nav_urls['upload'] = [ 'href' => self::makeSpecialUrl( 'Upload' ) ];
        } else {
            $nav_urls['upload'] = false;
        }
        $nav_urls['specialpages'] = [ 'href' => self::makeSpecialUrl( 'Specialpages' ) ];
 
        $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['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() || $this->getTitle()->isSpecialPage() ) ) {
            $nav_urls['print'] = [
                'text' => $this->msg( 'printableversion' )->text(),
                'href' => $this->getTitle()->getLocalURL(
                    $request->appendQueryValue( 'printable', 'yes' ) )
            ];
        }
 
        if ( $out->isArticle() ) {
            // Also add a "permalink" while we're at it
            $revid = $this->getOutput()->getRevisionId();
            if ( $revid ) {
                $nav_urls['permalink'] = [
                    'text' => $this->msg( 'permalink' )->text(),
                    'href' => $this->getTitle()->getLocalURL( "oldid=$revid" )
                ];
            }
 
            // Avoid PHP 7.1 warning of passing $this by reference
            $skinTemplate = $this;
            // Use the copy of revision ID in case this undocumented, shady hook tries to mess with internals
            Hooks::run( 'SkinTemplateBuildNavUrlsNav_urlsAfterPermalink',
                [ &$skinTemplate, &$nav_urls, &$revid, &$revid ] );
        }
 
        if ( $out->isArticleRelated() ) {
            $nav_urls['whatlinkshere'] = [
                'href' => SpecialPage::getTitleFor( 'Whatlinkshere', $this->thispage )->getLocalURL()
            ];
 
            $nav_urls['info'] = [
                'text' => $this->msg( 'pageinfo-toolboxlink' )->text(),
                'href' => $this->getTitle()->getLocalURL( "action=info" )
            ];
 
            if ( $this->getTitle()->exists() || $this->getTitle()->inNamespace( NS_CATEGORY ) ) {
                $nav_urls['recentchangeslinked'] = [
                    'href' => SpecialPage::getTitleFor( 'Recentchangeslinked', $this->thispage )->getLocalURL()
                ];
            }
        }
 
        $user = $this->getRelevantUser();
        if ( $user ) {
            $rootUser = $user->getName();
 
            $nav_urls['contributions'] = [
                'text' => $this->msg( 'contributions', $rootUser )->text(),
                'href' => self::makeSpecialUrlSubpage( 'Contributions', $rootUser ),
                'tooltip-params' => [ $rootUser ],
            ];
 
            $nav_urls['log'] = [
                'href' => self::makeSpecialUrlSubpage( 'Log', $rootUser )
            ];
 
            if ( MediawikiServices::getInstance()
                    ->getPermissionManager()
                    ->userHasRight( $this->getUser(), 'block' )
            ) {
                $nav_urls['blockip'] = [
                    'text' => $this->msg( 'blockip', $rootUser )->text(),
                    'href' => self::makeSpecialUrlSubpage( 'Block', $rootUser )
                ];
            }
 
            if ( $this->showEmailUser( $user ) ) {
                $nav_urls['emailuser'] = [
                    'text' => $this->msg( 'tool-link-emailuser', $rootUser )->text(),
                    'href' => self::makeSpecialUrlSubpage( 'Emailuser', $rootUser ),
                    'tooltip-params' => [ $rootUser ],
                ];
            }
 
            if ( !$user->isAnon() ) {
                if ( $this->getUser()->isRegistered() && $this->getConfig()->get( 'EnableSpecialMute' ) ) {
                    $nav_urls['mute'] = [
                        'text' => $this->msg( 'mute-preferences' )->text(),
                        'href' => self::makeSpecialUrlSubpage( 'Mute', $rootUser )
                    ];
                }
 
                $sur = new UserrightsPage;
                $sur->setContext( $this->getContext() );
                $canChange = $sur->userCanChangeRights( $user );
                $nav_urls['userrights'] = [
                    'text' => $this->msg(
                        $canChange ? 'tool-link-userrights' : 'tool-link-userrights-readonly',
                        $rootUser
                    )->text(),
                    'href' => self::makeSpecialUrlSubpage( 'Userrights', $rootUser )
                ];
            }
        }
 
        return $nav_urls;
    }
 
    protected function getNameSpaceKey() {
        return $this->getTitle()->getNamespaceKey();
    }
}