Skin.php

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<?php
abstract class Skin extends ContextSource {
    protected $skinname = 'standard';
    protected $mRelevantTitle = null;
    protected $mRelevantUser = null;
 
    static function getSkinNames() {
        global $wgValidSkinNames;
        static $skinsInitialised = false;
 
        if ( !$skinsInitialised || !count( $wgValidSkinNames ) ) {
            # Get a list of available skins
            # Build using the regular expression '^(.*).php$'
            # Array keys are all lower case, array value keep the case used by filename
            #
            wfProfileIn( __METHOD__ . '-init' );
 
            global $wgStyleDirectory;
 
            $skinDir = dir( $wgStyleDirectory );
 
            if ( $skinDir !== false && $skinDir !== null ) {
                # while code from www.php.net
                while ( false !== ( $file = $skinDir->read() ) ) {
                    // Skip non-PHP files, hidden files, and '.dep' includes
                    $matches = array();
 
                    if ( preg_match( '/^([^.]*)\.php$/', $file, $matches ) ) {
                        $aSkin = $matches[1];
 
                        // We're still loading core skins via the autodiscovery mechanism... :(
                        if ( !in_array( $aSkin, array( 'CologneBlue', 'Modern', 'MonoBook', 'Vector' ) ) ) {
                            wfLogWarning(
                                "A skin using autodiscovery mechanism, $aSkin, was found in your skins/ directory. " .
                                "The mechanism will be removed in MediaWiki 1.25 and the skin will no longer be recognized. " .
                                "See https://www.mediawiki.org/wiki/Manual:Skin_autodiscovery for information how to fix this."
                            );
                        }
 
                        $wgValidSkinNames[strtolower( $aSkin )] = $aSkin;
                    }
                }
                $skinDir->close();
            }
            $skinsInitialised = true;
            wfProfileOut( __METHOD__ . '-init' );
        }
        return $wgValidSkinNames;
    }
 
    static function getSkinNameMessages() {
        $messages = array();
        foreach ( self::getSkinNames() as $skinKey => $skinName ) {
            // Messages: skinname-cologneblue, skinname-monobook, skinname-modern, skinname-vector
            $messages[] = "skinname-$skinKey";
        }
        return $messages;
    }
 
    public static function getAllowedSkins() {
        global $wgSkipSkins;
 
        $allowedSkins = self::getSkinNames();
 
        foreach ( $wgSkipSkins as $skip ) {
            unset( $allowedSkins[$skip] );
        }
 
        return $allowedSkins;
    }
 
    public static function getUsableSkins() {
        wfDeprecated( __METHOD__, '1.23' );
        return self::getAllowedSkins();
    }
 
    static function normalizeKey( $key ) {
        global $wgDefaultSkin;
 
        $skinNames = Skin::getSkinNames();
 
        if ( $key == '' || $key == 'default' ) {
            // Don't return the default immediately;
            // in a misconfiguration we need to fall back.
            $key = $wgDefaultSkin;
        }
 
        if ( isset( $skinNames[$key] ) ) {
            return $key;
        }
 
        // Older versions of the software used a numeric setting
        // in the user preferences.
        $fallback = array(
            0 => $wgDefaultSkin,
            2 => 'cologneblue'
        );
 
        if ( isset( $fallback[$key] ) ) {
            $key = $fallback[$key];
        }
 
        if ( isset( $skinNames[$key] ) ) {
            return $key;
        } elseif ( isset( $skinNames[$wgDefaultSkin] ) ) {
            return $wgDefaultSkin;
        } else {
            return 'vector';
        }
    }
 
    static function &newFromKey( $key ) {
        global $wgStyleDirectory;
 
        $key = Skin::normalizeKey( $key );
 
        $skinNames = Skin::getSkinNames();
        $skinName = $skinNames[$key];
        $className = "Skin{$skinName}";
 
        # Grab the skin class and initialise it.
        if ( !class_exists( $className ) ) {
 
            require_once "{$wgStyleDirectory}/{$skinName}.php";
 
            # Check if we got if not fallback to default skin
            if ( !class_exists( $className ) ) {
                # DO NOT die if the class isn't found. This breaks maintenance
                # scripts and can cause a user account to be unrecoverable
                # except by SQL manipulation if a previously valid skin name
                # is no longer valid.
                wfDebug( "Skin class does not exist: $className\n" );
                $className = 'SkinVector';
                require_once "{$wgStyleDirectory}/Vector.php";
            }
        }
        $skin = new $className( $key );
        return $skin;
    }
 
    public function getSkinName() {
        return $this->skinname;
    }
 
    function initPage( OutputPage $out ) {
        wfProfileIn( __METHOD__ );
 
        $this->preloadExistence();
 
        wfProfileOut( __METHOD__ );
    }
 
    public function getDefaultModules() {
        global $wgIncludeLegacyJavaScript, $wgPreloadJavaScriptMwUtil, $wgUseAjax,
            $wgAjaxWatch, $wgEnableAPI, $wgEnableWriteAPI;
 
        $out = $this->getOutput();
        $user = $out->getUser();
        $modules = array(
            // modules that enhance the page content in some way
            'content' => array(
                'mediawiki.page.ready',
            ),
            // modules that exist for legacy reasons
            'legacy' => array(),
            // modules relating to search functionality
            'search' => array(),
            // modules relating to functionality relating to watching an article
            'watch' => array(),
            // modules which relate to the current users preferences
            'user' => array(),
        );
        if ( $wgIncludeLegacyJavaScript ) {
            $modules['legacy'][] = 'mediawiki.legacy.wikibits';
        }
 
        if ( $wgPreloadJavaScriptMwUtil ) {
            $modules['legacy'][] = 'mediawiki.util';
        }
 
        // Add various resources if required
        if ( $wgUseAjax ) {
            $modules['legacy'][] = 'mediawiki.legacy.ajax';
 
            if ( $wgEnableAPI ) {
                if ( $wgEnableWriteAPI && $wgAjaxWatch && $user->isLoggedIn()
                    && $user->isAllowed( 'writeapi' )
                ) {
                    $modules['watch'][] = 'mediawiki.page.watch.ajax';
                }
 
                $modules['search'][] = 'mediawiki.searchSuggest';
            }
        }
 
        if ( $user->getBoolOption( 'editsectiononrightclick' ) ) {
            $modules['user'][] = 'mediawiki.action.view.rightClickEdit';
        }
 
        // Crazy edit-on-double-click stuff
        if ( $out->isArticle() && $user->getOption( 'editondblclick' ) ) {
            $modules['user'][] = 'mediawiki.action.view.dblClickEdit';
        }
        return $modules;
    }
 
    function preloadExistence() {
        $user = $this->getUser();
 
        // User/talk link
        $titles = array( $user->getUserPage(), $user->getTalkPage() );
 
        // Other tab link
        if ( $this->getTitle()->isSpecialPage() ) {
            // nothing
        } elseif ( $this->getTitle()->isTalkPage() ) {
            $titles[] = $this->getTitle()->getSubjectPage();
        } else {
            $titles[] = $this->getTitle()->getTalkPage();
        }
 
        $lb = new LinkBatch( $titles );
        $lb->setCaller( __METHOD__ );
        $lb->execute();
    }
 
    public function getRevisionId() {
        return $this->getOutput()->getRevisionId();
    }
 
    public function isRevisionCurrent() {
        $revID = $this->getRevisionId();
        return $revID == 0 || $revID == $this->getTitle()->getLatestRevID();
    }
 
    public function setRelevantTitle( $t ) {
        $this->mRelevantTitle = $t;
    }
 
    public function getRelevantTitle() {
        if ( isset( $this->mRelevantTitle ) ) {
            return $this->mRelevantTitle;
        }
        return $this->getTitle();
    }
 
    public function setRelevantUser( $u ) {
        $this->mRelevantUser = $u;
    }
 
    public function getRelevantUser() {
        if ( isset( $this->mRelevantUser ) ) {
            return $this->mRelevantUser;
        }
        $title = $this->getRelevantTitle();
        if ( $title->hasSubjectNamespace( NS_USER ) ) {
            $rootUser = $title->getRootText();
            if ( User::isIP( $rootUser ) ) {
                $this->mRelevantUser = User::newFromName( $rootUser, false );
            } else {
                $user = User::newFromName( $rootUser, false );
                if ( $user && $user->isLoggedIn() ) {
                    $this->mRelevantUser = $user;
                }
            }
            return $this->mRelevantUser;
        }
        return null;
    }
 
    abstract function outputPage( OutputPage $out = null );
 
    static function makeVariablesScript( $data ) {
        if ( $data ) {
            return Html::inlineScript(
                ResourceLoader::makeLoaderConditionalScript( ResourceLoader::makeConfigSetScript( $data ) )
            );
        } else {
            return '';
        }
    }
 
    public static function makeGlobalVariablesScript( $unused ) {
        global $wgOut;
 
        wfDeprecated( __METHOD__, '1.19' );
 
        return self::makeVariablesScript( $wgOut->getJSVars() );
    }
 
    public static function getDynamicStylesheetQuery() {
        global $wgSquidMaxage;
 
        return array(
                'action' => 'raw',
                'maxage' => $wgSquidMaxage,
                'usemsgcache' => 'yes',
                'ctype' => 'text/css',
                'smaxage' => $wgSquidMaxage,
            );
    }
 
    abstract function setupSkinUserCss( OutputPage $out );
 
    function getPageClasses( $title ) {
        $numeric = 'ns-' . $title->getNamespace();
 
        if ( $title->isSpecialPage() ) {
            $type = 'ns-special';
            // bug 23315: provide a class based on the canonical special page name without subpages
            list( $canonicalName ) = SpecialPageFactory::resolveAlias( $title->getDBkey() );
            if ( $canonicalName ) {
                $type .= ' ' . Sanitizer::escapeClass( "mw-special-$canonicalName" );
            } else {
                $type .= ' mw-invalidspecialpage';
            }
        } elseif ( $title->isTalkPage() ) {
            $type = 'ns-talk';
        } else {
            $type = 'ns-subject';
        }
 
        $name = Sanitizer::escapeClass( 'page-' . $title->getPrefixedText() );
 
        return "$numeric $type $name";
    }
 
    /*
     * Return values for <html> element
     * @return array of associative name-to-value elements for <html> element
     */
    public function getHtmlElementAttributes() {
        $lang = $this->getLanguage();
        return array(
            'lang' => $lang->getHtmlCode(),
            'dir' => $lang->getDir(),
            'class' => 'client-nojs',
        );
    }
 
    function addToBodyAttributes( $out, &$bodyAttrs ) {
        // does nothing by default
    }
 
    function getLogo() {
        global $wgLogo;
        return $wgLogo;
    }
 
    function getCategoryLinks() {
        global $wgUseCategoryBrowser;
 
        $out = $this->getOutput();
        $allCats = $out->getCategoryLinks();
 
        if ( !count( $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'] ) )->escaped();
            $linkPage = wfMessage( 'pagecategorieslink' )->inContentLanguage()->text();
            $s .= '<div id="mw-normal-catlinks" class="mw-normal-catlinks">' .
                Linker::link( Title::newFromText( $linkPage ), $msg )
                . $colon . '<ul>' . $t . '</ul>' . '</div>';
        }
 
        # Hidden categories
        if ( isset( $allCats['hidden'] ) ) {
            if ( $this->getUser()->getBoolOption( 'showhiddencats' ) ) {
                $class = ' mw-hidden-cats-user-shown';
            } elseif ( $this->getTitle()->getNamespace() == NS_CATEGORY ) {
                $class = ' mw-hidden-cats-ns-shown';
            } else {
                $class = ' mw-hidden-cats-hidden';
            }
 
            $s .= "<div id=\"mw-hidden-catlinks\" class=\"mw-hidden-catlinks$class\">" .
                $this->msg( 'hidden-categories' )->numParams( count( $allCats['hidden'] ) )->escaped() .
                $colon . '<ul>' . $embed . implode( "{$pop}{$embed}", $allCats['hidden'] ) . $pop . '</ul>' .
                '</div>';
        }
 
        # optional 'dmoz-like' category browser. Will be shown under the list
        # of categories an article belong to
        if ( $wgUseCategoryBrowser ) {
            $s .= '<br /><hr />';
 
            # get a big array of the parents tree
            $parenttree = $this->getTitle()->getParentCategoryTree();
            # Skin object passed by reference cause it can not be
            # accessed under the method subfunction drawCategoryBrowser
            $tempout = explode( "\n", $this->drawCategoryBrowser( $parenttree ) );
            # Clean out bogus first entry and sort them
            unset( $tempout[0] );
            asort( $tempout );
            # Output one per line
            $s .= implode( "<br />\n", $tempout );
        }
 
        return $s;
    }
 
    function drawCategoryBrowser( $tree ) {
        $return = '';
 
        foreach ( $tree as $element => $parent ) {
            if ( empty( $parent ) ) {
                # element start a new list
                $return .= "\n";
            } else {
                # grab the others elements
                $return .= $this->drawCategoryBrowser( $parent ) . ' &gt; ';
            }
 
            # add our current element to the list
            $eltitle = Title::newFromText( $element );
            $return .= Linker::link( $eltitle, htmlspecialchars( $eltitle->getText() ) );
        }
 
        return $return;
    }
 
    function getCategories() {
        $out = $this->getOutput();
 
        $catlinks = $this->getCategoryLinks();
 
        $classes = 'catlinks';
 
        // Check what we're showing
        $allCats = $out->getCategoryLinks();
        $showHidden = $this->getUser()->getBoolOption( 'showhiddencats' ) ||
                        $this->getTitle()->getNamespace() == NS_CATEGORY;
 
        if ( empty( $allCats['normal'] ) && !( !empty( $allCats['hidden'] ) && $showHidden ) ) {
            $classes .= ' catlinks-allhidden';
        }
 
        return "<div id='catlinks' class='$classes'>{$catlinks}</div>";
    }
 
    protected function afterContentHook() {
        $data = '';
 
        if ( wfRunHooks( 'SkinAfterContent', array( &$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.\n" );
        }
 
        return $data;
    }
 
    protected function generateDebugHTML() {
        return MWDebug::getHTMLDebugLog();
    }
 
    function bottomScripts() {
        // TODO and the suckage continues. This function is really just a wrapper around
        // OutputPage::getBottomScripts() which takes a Skin param. This should be cleaned
        // up at some point
        $bottomScriptText = $this->getOutput()->getBottomScripts();
        wfRunHooks( 'SkinAfterBottomScripts', array( $this, &$bottomScriptText ) );
 
        return $bottomScriptText;
    }
 
    function printSource() {
        $oldid = $this->getRevisionId();
        if ( $oldid ) {
            $url = htmlspecialchars( wfExpandIRI( $this->getTitle()->getCanonicalURL( 'oldid=' . $oldid ) ) );
        } else {
            // oldid not available for non existing pages
            $url = htmlspecialchars( wfExpandIRI( $this->getTitle()->getCanonicalURL() ) );
        }
        return $this->msg( 'retrievedfrom', '<a href="' . $url . '">' . $url . '</a>' )->text();
    }
 
    function getUndeleteLink() {
        $action = $this->getRequest()->getVal( 'action', 'view' );
 
        if ( $this->getUser()->isAllowed( 'deletedhistory' ) &&
            ( $this->getTitle()->getArticleID() == 0 || $action == 'history' ) ) {
            $n = $this->getTitle()->isDeleted();
 
            if ( $n ) {
                if ( $this->getUser()->isAllowed( 'undelete' ) ) {
                    $msg = 'thisisdeleted';
                } else {
                    $msg = 'viewdeleted';
                }
 
                return $this->msg( $msg )->rawParams(
                    Linker::linkKnown(
                        SpecialPage::getTitleFor( 'Undelete', $this->getTitle()->getPrefixedDBkey() ),
                        $this->msg( 'restorelink' )->numParams( $n )->escaped() )
                    )->text();
            }
        }
 
        return '';
    }
 
    function subPageSubtitle() {
        global $wgLang;
        $out = $this->getOutput();
        $subpages = '';
 
        if ( !wfRunHooks( 'SkinSubPageSubtitle', array( &$subpages, $this, $out ) ) ) {
            return $subpages;
        }
 
        if ( $out->isArticle() && MWNamespace::hasSubpages( $out->getTitle()->getNamespace() ) ) {
            $ptext = $this->getTitle()->getPrefixedText();
            if ( preg_match( '/\//', $ptext ) ) {
                $links = explode( '/', $ptext );
                array_pop( $links );
                $c = 0;
                $growinglink = '';
                $display = '';
 
                foreach ( $links as $link ) {
                    $growinglink .= $link;
                    $display .= $link;
                    $linkObj = Title::newFromText( $growinglink );
 
                    if ( is_object( $linkObj ) && $linkObj->isKnown() ) {
                        $getlink = Linker::linkKnown(
                            $linkObj,
                            htmlspecialchars( $display )
                        );
 
                        $c++;
 
                        if ( $c > 1 ) {
                            $subpages .= $wgLang->getDirMarkEntity() . $this->msg( 'pipe-separator' )->escaped();
                        } else {
                            $subpages .= '&lt; ';
                        }
 
                        $subpages .= $getlink;
                        $display = '';
                    } else {
                        $display .= '/';
                    }
                    $growinglink .= '/';
                }
            }
        }
 
        return $subpages;
    }
 
    function showIPinHeader() {
        global $wgShowIPinHeader;
        return $wgShowIPinHeader && session_id() != '';
    }
 
    function getSearchLink() {
        $searchPage = SpecialPage::getTitleFor( 'Search' );
        return $searchPage->getLocalURL();
    }
 
    function escapeSearchLink() {
        return htmlspecialchars( $this->getSearchLink() );
    }
 
    function getCopyright( $type = 'detect' ) {
        global $wgRightsPage, $wgRightsUrl, $wgRightsText, $wgContLang;
 
        if ( $type == 'detect' ) {
            if ( !$this->isRevisionCurrent() && !$this->msg( 'history_copyright' )->inContentLanguage()->isDisabled() ) {
                $type = 'history';
            } else {
                $type = 'normal';
            }
        }
 
        if ( $type == 'history' ) {
            $msg = 'history_copyright';
        } else {
            $msg = 'copyright';
        }
 
        if ( $wgRightsPage ) {
            $title = Title::newFromText( $wgRightsPage );
            $link = Linker::linkKnown( $title, $wgRightsText );
        } elseif ( $wgRightsUrl ) {
            $link = Linker::makeExternalLink( $wgRightsUrl, $wgRightsText );
        } elseif ( $wgRightsText ) {
            $link = $wgRightsText;
        } else {
            # Give up now
            return '';
        }
 
        // Allow for site and per-namespace customization of copyright notice.
        $forContent = true;
 
        wfRunHooks( 'SkinCopyrightFooter', array( $this->getTitle(), $type, &$msg, &$link, &$forContent ) );
 
        $msgObj = $this->msg( $msg )->rawParams( $link );
        if ( $forContent ) {
            $msg = $msgObj->inContentLanguage()->text();
            if ( $this->getLanguage()->getCode() !== $wgContLang->getCode() ) {
                $msg = Html::rawElement( 'span', array( 'lang' => $wgContLang->getHtmlCode(), 'dir' => $wgContLang->getDir() ), $msg );
            }
            return $msg;
        } else {
            return $msgObj->text();
        }
    }
 
    function getCopyrightIcon() {
        global $wgRightsUrl, $wgRightsText, $wgRightsIcon, $wgCopyrightIcon;
 
        $out = '';
 
        if ( isset( $wgCopyrightIcon ) && $wgCopyrightIcon ) {
            $out = $wgCopyrightIcon;
        } elseif ( $wgRightsIcon ) {
            $icon = htmlspecialchars( $wgRightsIcon );
 
            if ( $wgRightsUrl ) {
                $url = htmlspecialchars( $wgRightsUrl );
                $out .= '<a href="' . $url . '">';
            }
 
            $text = htmlspecialchars( $wgRightsText );
            $out .= "<img src=\"$icon\" alt=\"$text\" width=\"88\" height=\"31\" />";
 
            if ( $wgRightsUrl ) {
                $out .= '</a>';
            }
        }
 
        return $out;
    }
 
    function getPoweredBy() {
        global $wgStylePath;
 
        $url = htmlspecialchars( "$wgStylePath/common/images/poweredby_mediawiki_88x31.png" );
        $text = '<a href="//www.mediawiki.org/"><img src="' . $url . '" height="31" width="88" alt="Powered by MediaWiki" /></a>';
        wfRunHooks( 'SkinGetPoweredBy', array( &$text, $this ) );
        return $text;
    }
 
    protected function lastModified() {
        $timestamp = $this->getOutput()->getRevisionTimestamp();
 
        # No cached timestamp, load it from the database
        if ( $timestamp === null ) {
            $timestamp = Revision::getTimestampFromId( $this->getTitle(), $this->getRevisionId() );
        }
 
        if ( $timestamp ) {
            $d = $this->getLanguage()->userDate( $timestamp, $this->getUser() );
            $t = $this->getLanguage()->userTime( $timestamp, $this->getUser() );
            $s = ' ' . $this->msg( 'lastmodifiedat', $d, $t )->text();
        } else {
            $s = '';
        }
 
        if ( wfGetLB()->getLaggedSlaveMode() ) {
            $s .= ' <strong>' . $this->msg( 'laggedslavemode' )->text() . '</strong>';
        }
 
        return $s;
    }
 
    function logoText( $align = '' ) {
        if ( $align != '' ) {
            $a = " style='float: {$align};'";
        } else {
            $a = '';
        }
 
        $mp = $this->msg( 'mainpage' )->escaped();
        $mptitle = Title::newMainPage();
        $url = ( is_object( $mptitle ) ? htmlspecialchars( $mptitle->getLocalURL() ) : '' );
 
        $logourl = $this->getLogo();
        $s = "<a href='{$url}'><img{$a} src='{$logourl}' alt='[{$mp}]' /></a>";
 
        return $s;
    }
 
    function makeFooterIcon( $icon, $withImage = 'withImage' ) {
        if ( is_string( $icon ) ) {
            $html = $icon;
        } else { // Assuming array
            $url = isset( $icon["url"] ) ? $icon["url"] : null;
            unset( $icon["url"] );
            if ( isset( $icon["src"] ) && $withImage === 'withImage' ) {
                $html = Html::element( 'img', $icon ); // do this the lazy way, just pass icon data as an attribute array
            } else {
                $html = htmlspecialchars( $icon["alt"] );
            }
            if ( $url ) {
                $html = Html::rawElement( 'a', array( "href" => $url ), $html );
            }
        }
        return $html;
    }
 
    function mainPageLink() {
        $s = Linker::linkKnown(
            Title::newMainPage(),
            $this->msg( 'mainpage' )->escaped()
        );
 
        return $s;
    }
 
    public function footerLink( $desc, $page ) {
        // if the link description has been set to "-" in the default language,
        if ( $this->msg( $desc )->inContentLanguage()->isDisabled() ) {
            // then it is disabled, for all languages.
            return '';
        } else {
            // Otherwise, we display the link for the user, described in their
            // language (which may or may not be the same as the default language),
            // but we make the link target be the one site-wide page.
            $title = Title::newFromText( $this->msg( $page )->inContentLanguage()->text() );
 
            return Linker::linkKnown(
                $title,
                $this->msg( $desc )->escaped()
            );
        }
    }
 
    function privacyLink() {
        return $this->footerLink( 'privacy', 'privacypage' );
    }
 
    function aboutLink() {
        return $this->footerLink( 'aboutsite', 'aboutpage' );
    }
 
    function disclaimerLink() {
        return $this->footerLink( 'disclaimers', 'disclaimerpage' );
    }
 
    function editUrlOptions() {
        $options = array( 'action' => 'edit' );
 
        if ( !$this->isRevisionCurrent() ) {
            $options['oldid'] = intval( $this->getRevisionId() );
        }
 
        return $options;
    }
 
    function showEmailUser( $id ) {
        if ( $id instanceof User ) {
            $targetUser = $id;
        } else {
            $targetUser = User::newFromId( $id );
        }
        return $this->getUser()->canSendEmail() && # the sending user must have a confirmed email address
            $targetUser->canReceiveEmail(); # the target user must have a confirmed email address and allow emails from users
    }
 
    function getCommonStylePath( $name ) {
        global $wgStylePath, $wgStyleVersion;
        return "$wgStylePath/common/$name?$wgStyleVersion";
    }
 
    function getSkinStylePath( $name ) {
        global $wgStylePath, $wgStyleVersion;
        return "$wgStylePath/{$this->stylename}/$name?$wgStyleVersion";
    }
 
    /* these are used extensively in SkinTemplate, but also some other places */
 
    static function makeMainPageUrl( $urlaction = '' ) {
        $title = Title::newMainPage();
        self::checkTitle( $title, '' );
 
        return $title->getLocalURL( $urlaction );
    }
 
    static function makeSpecialUrl( $name, $urlaction = '', $proto = null ) {
        $title = SpecialPage::getSafeTitleFor( $name );
        if ( is_null( $proto ) ) {
            return $title->getLocalURL( $urlaction );
        } else {
            return $title->getFullURL( $urlaction, false, $proto );
        }
    }
 
    static function makeSpecialUrlSubpage( $name, $subpage, $urlaction = '' ) {
        $title = SpecialPage::getSafeTitleFor( $name, $subpage );
        return $title->getLocalURL( $urlaction );
    }
 
    static function makeI18nUrl( $name, $urlaction = '' ) {
        $title = Title::newFromText( wfMessage( $name )->inContentLanguage()->text() );
        self::checkTitle( $title, $name );
        return $title->getLocalURL( $urlaction );
    }
 
    static function makeUrl( $name, $urlaction = '' ) {
        $title = Title::newFromText( $name );
        self::checkTitle( $title, $name );
 
        return $title->getLocalURL( $urlaction );
    }
 
    static function makeInternalOrExternalUrl( $name ) {
        if ( preg_match( '/^(?i:' . wfUrlProtocols() . ')/', $name ) ) {
            return $name;
        } else {
            return self::makeUrl( $name );
        }
    }
 
    static function makeNSUrl( $name, $urlaction = '', $namespace = NS_MAIN ) {
        $title = Title::makeTitleSafe( $namespace, $name );
        self::checkTitle( $title, $name );
 
        return $title->getLocalURL( $urlaction );
    }
 
    static function makeUrlDetails( $name, $urlaction = '' ) {
        $title = Title::newFromText( $name );
        self::checkTitle( $title, $name );
 
        return array(
            'href' => $title->getLocalURL( $urlaction ),
            'exists' => $title->getArticleID() != 0,
        );
    }
 
    static function makeKnownUrlDetails( $name, $urlaction = '' ) {
        $title = Title::newFromText( $name );
        self::checkTitle( $title, $name );
 
        return array(
            'href' => $title->getLocalURL( $urlaction ),
            'exists' => true
        );
    }
 
    static function checkTitle( &$title, $name ) {
        if ( !is_object( $title ) ) {
            $title = Title::newFromText( $name );
            if ( !is_object( $title ) ) {
                $title = Title::newFromText( '--error: link target missing--' );
            }
        }
    }
 
    function buildSidebar() {
        global $wgMemc, $wgEnableSidebarCache, $wgSidebarCacheExpiry;
        wfProfileIn( __METHOD__ );
 
        $key = wfMemcKey( 'sidebar', $this->getLanguage()->getCode() );
 
        if ( $wgEnableSidebarCache ) {
            $cachedsidebar = $wgMemc->get( $key );
            if ( $cachedsidebar ) {
                wfProfileOut( __METHOD__ );
                return $cachedsidebar;
            }
        }
 
        $bar = array();
        $this->addToSidebar( $bar, 'sidebar' );
 
        wfRunHooks( 'SkinBuildSidebar', array( $this, &$bar ) );
        if ( $wgEnableSidebarCache ) {
            $wgMemc->set( $key, $bar, $wgSidebarCacheExpiry );
        }
 
        wfProfileOut( __METHOD__ );
        return $bar;
    }
 
    function addToSidebar( &$bar, $message ) {
        $this->addToSidebarPlain( $bar, wfMessage( $message )->inContentLanguage()->plain() );
    }
 
    function addToSidebarPlain( &$bar, $text ) {
        $lines = explode( "\n", $text );
 
        $heading = '';
 
        foreach ( $lines as $line ) {
            if ( strpos( $line, '*' ) !== 0 ) {
                continue;
            }
            $line = rtrim( $line, "\r" ); // for Windows compat
 
            if ( strpos( $line, '**' ) !== 0 ) {
                $heading = trim( $line, '* ' );
                if ( !array_key_exists( $heading, $bar ) ) {
                    $bar[$heading] = array();
                }
            } else {
                $line = trim( $line, '* ' );
 
                if ( strpos( $line, '|' ) !== false ) { // sanity check
                    $line = MessageCache::singleton()->transform( $line, false, null, $this->getTitle() );
                    $line = array_map( 'trim', explode( '|', $line, 2 ) );
                    if ( count( $line ) !== 2 ) {
                        // Second sanity check, could be hit by people doing
                        // funky stuff with parserfuncs... (bug 33321)
                        continue;
                    }
 
                    $extraAttribs = array();
 
                    $msgLink = $this->msg( $line[0] )->inContentLanguage();
                    if ( $msgLink->exists() ) {
                        $link = $msgLink->text();
                        if ( $link == '-' ) {
                            continue;
                        }
                    } else {
                        $link = $line[0];
                    }
                    $msgText = $this->msg( $line[1] );
                    if ( $msgText->exists() ) {
                        $text = $msgText->text();
                    } else {
                        $text = $line[1];
                    }
 
                    if ( preg_match( '/^(?i:' . wfUrlProtocols() . ')/', $link ) ) {
                        $href = $link;
 
                        // Parser::getExternalLinkAttribs won't work here because of the Namespace things
                        global $wgNoFollowLinks, $wgNoFollowDomainExceptions;
                        if ( $wgNoFollowLinks && !wfMatchesDomainList( $href, $wgNoFollowDomainExceptions ) ) {
                            $extraAttribs['rel'] = 'nofollow';
                        }
 
                        global $wgExternalLinkTarget;
                        if ( $wgExternalLinkTarget ) {
                            $extraAttribs['target'] = $wgExternalLinkTarget;
                        }
                    } else {
                        $title = Title::newFromText( $link );
 
                        if ( $title ) {
                            $title = $title->fixSpecialName();
                            $href = $title->getLinkURL();
                        } else {
                            $href = 'INVALID-TITLE';
                        }
                    }
 
                    $bar[$heading][] = array_merge( array(
                        'text' => $text,
                        'href' => $href,
                        'id' => 'n-' . Sanitizer::escapeId( strtr( $line[1], ' ', '-' ), 'noninitial' ),
                        'active' => false
                    ), $extraAttribs );
                } else {
                    continue;
                }
            }
        }
 
        return $bar;
    }
 
    public function commonPrintStylesheet() {
        wfDeprecated( __METHOD__, '1.22' );
        return false;
    }
 
    function getNewtalks() {
 
        $newMessagesAlert = '';
        $user = $this->getUser();
        $newtalks = $user->getNewMessageLinks();
        $out = $this->getOutput();
 
        // Allow extensions to disable or modify the new messages alert
        if ( !wfRunHooks( 'GetNewMessagesAlert', array( &$newMessagesAlert, $newtalks, $user, $out ) ) ) {
            return '';
        }
        if ( $newMessagesAlert ) {
            return $newMessagesAlert;
        }
 
        if ( count( $newtalks ) == 1 && $newtalks[0]['wiki'] === wfWikiID() ) {
            $uTalkTitle = $user->getTalkPage();
            $lastSeenRev = isset( $newtalks[0]['rev'] ) ? $newtalks[0]['rev'] : null;
            $nofAuthors = 0;
            if ( $lastSeenRev !== null ) {
                $plural = true; // Default if we have a last seen revision: if unknown, use plural
                $latestRev = Revision::newFromTitle( $uTalkTitle, false, Revision::READ_NORMAL );
                if ( $latestRev !== null ) {
                    // Singular if only 1 unseen revision, plural if several unseen revisions.
                    $plural = $latestRev->getParentId() !== $lastSeenRev->getId();
                    $nofAuthors = $uTalkTitle->countAuthorsBetween(
                        $lastSeenRev, $latestRev, 10, '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 = Linker::linkKnown(
                $uTalkTitle,
                $this->msg( 'newmessageslinkplural' )->params( $plural )->escaped(),
                array(),
                array( 'redirect' => 'no' )
            );
 
            $newMessagesDiffLink = Linker::linkKnown(
                $uTalkTitle,
                $this->msg( 'newmessagesdifflinkplural' )->params( $plural )->escaped(),
                array(),
                $lastSeenRev !== null
                    ? array( 'oldid' => $lastSeenRev->getId(), 'diff' => 'cur' )
                    : array( 'diff' => 'cur' )
            );
 
            if ( $nofAuthors >= 1 && $nofAuthors <= 10 ) {
                $newMessagesAlert = $this->msg(
                    'youhavenewmessagesfromusers',
                    $newMessagesLink,
                    $newMessagesDiffLink
                )->numParams( $nofAuthors, $plural );
            } else {
                // $nofAuthors === 11 signifies "11 or more" ("more than 10")
                $newMessagesAlert = $this->msg(
                    $nofAuthors > 10 ? 'youhavenewmessagesmanyusers' : 'youhavenewmessages',
                    $newMessagesLink,
                    $newMessagesDiffLink
                )->numParams( $plural );
            }
            $newMessagesAlert = $newMessagesAlert->text();
            # Disable Squid cache
            $out->setSquidMaxage( 0 );
        } elseif ( count( $newtalks ) ) {
            $sep = $this->msg( 'newtalkseparator' )->escaped();
            $msgs = array();
 
            foreach ( $newtalks as $newtalk ) {
                $msgs[] = Xml::element(
                    'a',
                    array( 'href' => $newtalk['link'] ), $newtalk['wiki']
                );
            }
            $parts = implode( $sep, $msgs );
            $newMessagesAlert = $this->msg( 'youhavenewmessagesmulti' )->rawParams( $parts )->escaped();
            $out->setSquidMaxage( 0 );
        }
 
        return $newMessagesAlert;
    }
 
    private function getCachedNotice( $name ) {
        global $wgRenderHashAppend, $parserMemc, $wgContLang;
 
        wfProfileIn( __METHOD__ );
 
        $needParse = false;
 
        if ( $name === 'default' ) {
            // special case
            global $wgSiteNotice;
            $notice = $wgSiteNotice;
            if ( empty( $notice ) ) {
                wfProfileOut( __METHOD__ );
                return false;
            }
        } else {
            $msg = $this->msg( $name )->inContentLanguage();
            if ( $msg->isDisabled() ) {
                wfProfileOut( __METHOD__ );
                return false;
            }
            $notice = $msg->plain();
        }
 
        // Use the extra hash appender to let eg SSL variants separately cache.
        $key = wfMemcKey( $name . $wgRenderHashAppend );
        $cachedNotice = $parserMemc->get( $key );
        if ( is_array( $cachedNotice ) ) {
            if ( md5( $notice ) == $cachedNotice['hash'] ) {
                $notice = $cachedNotice['html'];
            } else {
                $needParse = true;
            }
        } else {
            $needParse = true;
        }
 
        if ( $needParse ) {
            $parsed = $this->getOutput()->parse( $notice );
            $parserMemc->set( $key, array( 'html' => $parsed, 'hash' => md5( $notice ) ), 600 );
            $notice = $parsed;
        }
 
        $notice = Html::rawElement( 'div', array( 'id' => 'localNotice',
            'lang' => $wgContLang->getHtmlCode(), 'dir' => $wgContLang->getDir() ), $notice );
        wfProfileOut( __METHOD__ );
        return $notice;
    }
 
    function getNamespaceNotice() {
        wfProfileIn( __METHOD__ );
 
        $key = 'namespacenotice-' . $this->getTitle()->getNsText();
        $namespaceNotice = $this->getCachedNotice( $key );
        if ( $namespaceNotice && substr( $namespaceNotice, 0, 7 ) != '<p>&lt;' ) {
            $namespaceNotice = '<div id="namespacebanner">' . $namespaceNotice . '</div>';
        } else {
            $namespaceNotice = '';
        }
 
        wfProfileOut( __METHOD__ );
        return $namespaceNotice;
    }
 
    function getSiteNotice() {
        wfProfileIn( __METHOD__ );
        $siteNotice = '';
 
        if ( wfRunHooks( 'SiteNoticeBefore', array( &$siteNotice, $this ) ) ) {
            if ( is_object( $this->getUser() ) && $this->getUser()->isLoggedIn() ) {
                $siteNotice = $this->getCachedNotice( 'sitenotice' );
            } else {
                $anonNotice = $this->getCachedNotice( 'anonnotice' );
                if ( !$anonNotice ) {
                    $siteNotice = $this->getCachedNotice( 'sitenotice' );
                } else {
                    $siteNotice = $anonNotice;
                }
            }
            if ( !$siteNotice ) {
                $siteNotice = $this->getCachedNotice( 'default' );
            }
        }
 
        wfRunHooks( 'SiteNoticeAfter', array( &$siteNotice, $this ) );
        wfProfileOut( __METHOD__ );
        return $siteNotice;
    }
 
    public function doEditSectionLink( Title $nt, $section, $tooltip = null, $lang = false ) {
        // HTML generated here should probably have userlangattributes
        // added to it for LTR text on RTL pages
 
        $lang = wfGetLangObj( $lang );
 
        $attribs = array();
        if ( !is_null( $tooltip ) ) {
            # Bug 25462: undo double-escaping.
            $tooltip = Sanitizer::decodeCharReferences( $tooltip );
            $attribs['title'] = wfMessage( 'editsectionhint' )->rawParams( $tooltip )
                ->inLanguage( $lang )->text();
        }
        $link = Linker::link( $nt, wfMessage( 'editsection' )->inLanguage( $lang )->text(),
            $attribs,
            array( 'action' => 'edit', 'section' => $section ),
            array( 'noclasses', 'known' )
        );
 
        # Add the brackets and the span and run the hook.
        $result = '<span class="mw-editsection">'
            . '<span class="mw-editsection-bracket">[</span>'
            . $link
            . '<span class="mw-editsection-bracket">]</span>'
            . '</span>';
 
        wfRunHooks( 'DoEditSectionLink', array( $this, $nt, $section, $tooltip, &$result, $lang ) );
        return $result;
    }
 
    function __call( $fname, $args ) {
        $realFunction = array( 'Linker', $fname );
        if ( is_callable( $realFunction ) ) {
            wfDeprecated( get_class( $this ) . '::' . $fname, '1.21' );
            return call_user_func_array( $realFunction, $args );
        } else {
            $className = get_class( $this );
            throw new MWException( "Call to undefined method $className::$fname" );
        }
    }
 
}