OutputPage.php

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<?php
class OutputPage extends ContextSource {
        var $mMetatags = array();

        var $mKeywords = array();

        var $mLinktags = array();
        var $mCanonicalUrl = false;

        var $mExtStyles = array();

        var $mPagetitle = '';

        var $mBodytext = '';

        public $mDebugtext = '';

        var $mHTMLtitle = '';

        var $mIsarticle = false;

        var $mIsArticleRelated = true;

        var $mPrintable = false;

        private $mSubtitle = array();

        var $mRedirect = '';
        var $mStatusCode;

        var $mLastModified = '';

        var $mETag = false;

        var $mCategoryLinks = array();
        var $mCategories = array();

        var $mLanguageLinks = array();

        var $mScripts = '';

        var $mInlineStyles = '';

        //
        var $mLinkColours;

        var $mPageLinkTitle = '';

        var $mHeadItems = array();

        // @todo FIXME: Next variables probably comes from the resource loader
        var $mModules = array(), $mModuleScripts = array(), $mModuleStyles = array(), $mModuleMessages = array();
        var $mResourceLoader;
        var $mJsConfigVars = array();

        var $mInlineMsg = array();

        var $mTemplateIds = array();
        var $mImageTimeKeys = array();

        var $mRedirectCode = '';

        var $mFeedLinksAppendQuery = null;

        # What level of 'untrustworthiness' is allowed in CSS/JS modules loaded on this page?
        # @see ResourceLoaderModule::$origin
        # ResourceLoaderModule::ORIGIN_ALL is assumed unless overridden;
        protected $mAllowedModules = array(
                ResourceLoaderModule::TYPE_COMBINED => ResourceLoaderModule::ORIGIN_ALL,
        );

        var $mDoNothing = false;

        // Parser related.
        var $mContainsOldMagic = 0, $mContainsNewMagic = 0;

        protected $mParserOptions = null;

        var $mFeedLinks = array();

        // Gwicke work on squid caching? Roughly from 2003.
        var $mEnableClientCache = true;

        var $mArticleBodyOnly = false;

        var $mNewSectionLink = false;
        var $mHideNewSectionLink = false;

        var $mNoGallery = false;

        // should be private.
        var $mPageTitleActionText = '';
        var $mParseWarnings = array();

        // Cache stuff. Looks like mEnableClientCache
        var $mSquidMaxage = 0;

        // @todo document
        var $mPreventClickjacking = true;

        var $mRevisionId = null;
        private $mRevisionTimestamp = null;

        var $mFileVersion = null;

        var $styles = array();

        protected $mJQueryDone = false;

        private $mIndexPolicy = 'index';
        private $mFollowPolicy = 'follow';
        private $mVaryHeader = array(
                'Accept-Encoding' => array( 'list-contains=gzip' ),
        );

        private $mRedirectedFrom = null;

        private $mProperties = array();

        function __construct( IContextSource $context = null ) {
                if ( $context === null ) {
                        # Extensions should use `new RequestContext` instead of `new OutputPage` now.
                        wfDeprecated( __METHOD__, '1.18' );
                } else {
                        $this->setContext( $context );
                }
        }

        public function redirect( $url, $responsecode = '302' ) {
                # Strip newlines as a paranoia check for header injection in PHP<5.1.2
                $this->mRedirect = str_replace( "\n", '', $url );
                $this->mRedirectCode = $responsecode;
        }

        public function getRedirect() {
                return $this->mRedirect;
        }

        public function setStatusCode( $statusCode ) {
                $this->mStatusCode = $statusCode;
        }

        function addMeta( $name, $val ) {
                array_push( $this->mMetatags, array( $name, $val ) );
        }

        function addKeyword( $text ) {
                if( is_array( $text ) ) {
                        $this->mKeywords = array_merge( $this->mKeywords, $text );
                } else {
                        array_push( $this->mKeywords, $text );
                }
        }

        function addLink( $linkarr ) {
                array_push( $this->mLinktags, $linkarr );
        }

        function addMetadataLink( $linkarr ) {
                $linkarr['rel'] = $this->getMetadataAttribute();
                $this->addLink( $linkarr );
        }

        function setCanonicalUrl( $url ) {
                $this->mCanonicalUrl = $url;
        }

        public function getMetadataAttribute() {
                # note: buggy CC software only reads first "meta" link
                static $haveMeta = false;
                if ( $haveMeta ) {
                        return 'alternate meta';
                } else {
                        $haveMeta = true;
                        return 'meta';
                }
        }

        function addScript( $script ) {
                $this->mScripts .= $script . "\n";
        }

        public function addExtensionStyle( $url ) {
                array_push( $this->mExtStyles, $url );
        }

        function getExtStyle() {
                return $this->mExtStyles;
        }

        public function addScriptFile( $file, $version = null ) {
                global $wgStylePath, $wgStyleVersion;
                // See if $file parameter is an absolute URL or begins with a slash
                if( substr( $file, 0, 1 ) == '/' || preg_match( '#^[a-z]*://#i', $file ) ) {
                        $path = $file;
                } else {
                        $path = "{$wgStylePath}/common/{$file}";
                }
                if ( is_null( $version ) )
                        $version = $wgStyleVersion;
                $this->addScript( Html::linkedScript( wfAppendQuery( $path, $version ) ) );
        }

        public function addInlineScript( $script ) {
                $this->mScripts .= Html::inlineScript( "\n$script\n" ) . "\n";
        }

        function getScript() {
                return $this->mScripts . $this->getHeadItems();
        }

        protected function filterModules( $modules, $position = null, $type = ResourceLoaderModule::TYPE_COMBINED ) {
                $resourceLoader = $this->getResourceLoader();
                $filteredModules = array();
                foreach( $modules as $val ) {
                        $module = $resourceLoader->getModule( $val );
                        if( $module instanceof ResourceLoaderModule
                                && $module->getOrigin() <= $this->getAllowedModules( $type )
                                && ( is_null( $position ) || $module->getPosition() == $position ) )
                        {
                                $filteredModules[] = $val;
                        }
                }
                return $filteredModules;
        }

        public function getModules( $filter = false, $position = null, $param = 'mModules' ) {
                $modules = array_values( array_unique( $this->$param ) );
                return $filter
                        ? $this->filterModules( $modules, $position )
                        : $modules;
        }

        public function addModules( $modules ) {
                $this->mModules = array_merge( $this->mModules, (array)$modules );
        }

        public function getModuleScripts( $filter = false, $position = null ) {
                return $this->getModules( $filter, $position, 'mModuleScripts' );
        }

        public function addModuleScripts( $modules ) {
                $this->mModuleScripts = array_merge( $this->mModuleScripts, (array)$modules );
        }

        public function getModuleStyles( $filter = false, $position = null ) {
                return $this->getModules( $filter, $position, 'mModuleStyles' );
        }

        public function addModuleStyles( $modules ) {
                $this->mModuleStyles = array_merge( $this->mModuleStyles, (array)$modules );
        }

        public function getModuleMessages( $filter = false, $position = null ) {
                return $this->getModules( $filter, $position, 'mModuleMessages' );
        }

        public function addModuleMessages( $modules ) {
                $this->mModuleMessages = array_merge( $this->mModuleMessages, (array)$modules );
        }

        function getHeadItemsArray() {
                return $this->mHeadItems;
        }

        function getHeadItems() {
                $s = '';
                foreach ( $this->mHeadItems as $item ) {
                        $s .= $item;
                }
                return $s;
        }

        public function addHeadItem( $name, $value ) {
                $this->mHeadItems[$name] = $value;
        }

        public function hasHeadItem( $name ) {
                return isset( $this->mHeadItems[$name] );
        }

        function setETag( $tag ) {
                $this->mETag = $tag;
        }

        public function setArticleBodyOnly( $only ) {
                $this->mArticleBodyOnly = $only;
        }

        public function getArticleBodyOnly() {
                return $this->mArticleBodyOnly;
        }

        public function setProperty( $name, $value ) {
                $this->mProperties[$name] = $value;
        }

        public function getProperty( $name ) {
                if ( isset( $this->mProperties[$name] ) ) {
                        return $this->mProperties[$name];
                } else {
                        return null;
                }
        }

        public function checkLastModified( $timestamp ) {
                global $wgCachePages, $wgCacheEpoch;

                if ( !$timestamp || $timestamp == '19700101000000' ) {
                        wfDebug( __METHOD__ . ": CACHE DISABLED, NO TIMESTAMP\n" );
                        return false;
                }
                if( !$wgCachePages ) {
                        wfDebug( __METHOD__ . ": CACHE DISABLED\n", false );
                        return false;
                }
                if( $this->getUser()->getOption( 'nocache' ) ) {
                        wfDebug( __METHOD__ . ": USER DISABLED CACHE\n", false );
                        return false;
                }

                $timestamp = wfTimestamp( TS_MW, $timestamp );
                $modifiedTimes = array(
                        'page' => $timestamp,
                        'user' => $this->getUser()->getTouched(),
                        'epoch' => $wgCacheEpoch
                );
                wfRunHooks( 'OutputPageCheckLastModified', array( &$modifiedTimes ) );

                $maxModified = max( $modifiedTimes );
                $this->mLastModified = wfTimestamp( TS_RFC2822, $maxModified );

                $clientHeader = $this->getRequest()->getHeader( 'If-Modified-Since' );
                if ( $clientHeader === false ) {
                        wfDebug( __METHOD__ . ": client did not send If-Modified-Since header\n", false );
                        return false;
                }

                # IE sends sizes after the date like this:
                # Wed, 20 Aug 2003 06:51:19 GMT; length=5202
                # this breaks strtotime().
                $clientHeader = preg_replace( '/;.*$/', '', $clientHeader );

                wfSuppressWarnings(); // E_STRICT system time bitching
                $clientHeaderTime = strtotime( $clientHeader );
                wfRestoreWarnings();
                if ( !$clientHeaderTime ) {
                        wfDebug( __METHOD__ . ": unable to parse the client's If-Modified-Since header: $clientHeader\n" );
                        return false;
                }
                $clientHeaderTime = wfTimestamp( TS_MW, $clientHeaderTime );

                # Make debug info
                $info = '';
                foreach ( $modifiedTimes as $name => $value ) {
                        if ( $info !== '' ) {
                                $info .= ', ';
                        }
                        $info .= "$name=" . wfTimestamp( TS_ISO_8601, $value );
                }

                wfDebug( __METHOD__ . ": client sent If-Modified-Since: " .
                        wfTimestamp( TS_ISO_8601, $clientHeaderTime ) . "\n", false );
                wfDebug( __METHOD__ . ": effective Last-Modified: " .
                        wfTimestamp( TS_ISO_8601, $maxModified ) . "\n", false );
                if( $clientHeaderTime < $maxModified ) {
                        wfDebug( __METHOD__ . ": STALE, $info\n", false );
                        return false;
                }

                # Not modified
                # Give a 304 response code and disable body output
                wfDebug( __METHOD__ . ": NOT MODIFIED, $info\n", false );
                ini_set( 'zlib.output_compression', 0 );
                $this->getRequest()->response()->header( "HTTP/1.1 304 Not Modified" );
                $this->sendCacheControl();
                $this->disable();

                // Don't output a compressed blob when using ob_gzhandler;
                // it's technically against HTTP spec and seems to confuse
                // Firefox when the response gets split over two packets.
                wfClearOutputBuffers();

                return true;
        }

        public function setLastModified( $timestamp ) {
                $this->mLastModified = wfTimestamp( TS_RFC2822, $timestamp );
        }

        public function setRobotPolicy( $policy ) {
                $policy = Article::formatRobotPolicy( $policy );

                if( isset( $policy['index'] ) ) {
                        $this->setIndexPolicy( $policy['index'] );
                }
                if( isset( $policy['follow'] ) ) {
                        $this->setFollowPolicy( $policy['follow'] );
                }
        }

        public function setIndexPolicy( $policy ) {
                $policy = trim( $policy );
                if( in_array( $policy, array( 'index', 'noindex' ) ) ) {
                        $this->mIndexPolicy = $policy;
                }
        }

        public function setFollowPolicy( $policy ) {
                $policy = trim( $policy );
                if( in_array( $policy, array( 'follow', 'nofollow' ) ) ) {
                        $this->mFollowPolicy = $policy;
                }
        }

        public function setPageTitleActionText( $text ) {
                $this->mPageTitleActionText = $text;
        }

        public function getPageTitleActionText() {
                if ( isset( $this->mPageTitleActionText ) ) {
                        return $this->mPageTitleActionText;
                }
                return '';
        }

        public function setHTMLTitle( $name ) {
                if ( $name instanceof Message ) {
                        $this->mHTMLtitle = $name->setContext( $this->getContext() )->text();
                } else {
                        $this->mHTMLtitle = $name;
                }
        }

        public function getHTMLTitle() {
                return $this->mHTMLtitle;
        }

        public function setRedirectedFrom( $t ) {
                $this->mRedirectedFrom = $t;
        }

        public function setPageTitle( $name ) {
                if ( $name instanceof Message ) {
                        $name = $name->setContext( $this->getContext() )->text();
                }

                # change "<script>foo&bar</script>" to "&lt;script&gt;foo&amp;bar&lt;/script&gt;"
                # but leave "<i>foobar</i>" alone
                $nameWithTags = Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags( $name ) );
                $this->mPagetitle = $nameWithTags;

                # change "<i>foo&amp;bar</i>" to "foo&bar"
                $this->setHTMLTitle( $this->msg( 'pagetitle' )->rawParams( Sanitizer::stripAllTags( $nameWithTags ) ) );
        }

        public function getPageTitle() {
                return $this->mPagetitle;
        }

        public function setTitle( Title $t ) {
                $this->getContext()->setTitle( $t );
        }

        public function setSubtitle( $str ) {
                $this->clearSubtitle();
                $this->addSubtitle( $str );
        }

        public function appendSubtitle( $str ) {
                $this->addSubtitle( $str );
        }

        public function addSubtitle( $str ) {
                if ( $str instanceof Message ) {
                        $this->mSubtitle[] = $str->setContext( $this->getContext() )->parse();
                } else {
                        $this->mSubtitle[] = $str;
                }
        }

        public function addBacklinkSubtitle( Title $title ) {
                $query = array();
                if ( $title->isRedirect() ) {
                        $query['redirect'] = 'no';
                }
                $this->addSubtitle( $this->msg( 'backlinksubtitle' )->rawParams( Linker::link( $title, null, array(), $query ) ) );
        }

        public function clearSubtitle() {
                $this->mSubtitle = array();
        }

        public function getSubtitle() {
                return implode( "<br />\n\t\t\t\t", $this->mSubtitle );
        }

        public function setPrintable() {
                $this->mPrintable = true;
        }

        public function isPrintable() {
                return $this->mPrintable;
        }

        public function disable() {
                $this->mDoNothing = true;
        }

        public function isDisabled() {
                return $this->mDoNothing;
        }

        public function showNewSectionLink() {
                return $this->mNewSectionLink;
        }

        public function forceHideNewSectionLink() {
                return $this->mHideNewSectionLink;
        }

        public function setSyndicated( $show = true ) {
                if ( $show ) {
                        $this->setFeedAppendQuery( false );
                } else {
                        $this->mFeedLinks = array();
                }
        }

        public function setFeedAppendQuery( $val ) {
                global $wgAdvertisedFeedTypes;

                $this->mFeedLinks = array();

                foreach ( $wgAdvertisedFeedTypes as $type ) {
                        $query = "feed=$type";
                        if ( is_string( $val ) ) {
                                $query .= '&' . $val;
                        }
                        $this->mFeedLinks[$type] = $this->getTitle()->getLocalURL( $query );
                }
        }

        public function addFeedLink( $format, $href ) {
                global $wgAdvertisedFeedTypes;

                if ( in_array( $format, $wgAdvertisedFeedTypes ) ) {
                        $this->mFeedLinks[$format] = $href;
                }
        }

        public function isSyndicated() {
                return count( $this->mFeedLinks ) > 0;
        }

        public function getSyndicationLinks() {
                return $this->mFeedLinks;
        }

        public function getFeedAppendQuery() {
                return $this->mFeedLinksAppendQuery;
        }

        public function setArticleFlag( $v ) {
                $this->mIsarticle = $v;
                if ( $v ) {
                        $this->mIsArticleRelated = $v;
                }
        }

        public function isArticle() {
                return $this->mIsarticle;
        }

        public function setArticleRelated( $v ) {
                $this->mIsArticleRelated = $v;
                if ( !$v ) {
                        $this->mIsarticle = false;
                }
        }

        public function isArticleRelated() {
                return $this->mIsArticleRelated;
        }

        public function addLanguageLinks( $newLinkArray ) {
                $this->mLanguageLinks += $newLinkArray;
        }

        public function setLanguageLinks( $newLinkArray ) {
                $this->mLanguageLinks = $newLinkArray;
        }

        public function getLanguageLinks() {
                return $this->mLanguageLinks;
        }

        public function addCategoryLinks( $categories ) {
                global $wgContLang;

                if ( !is_array( $categories ) || count( $categories ) == 0 ) {
                        return;
                }

                # Add the links to a LinkBatch
                $arr = array( NS_CATEGORY => $categories );
                $lb = new LinkBatch;
                $lb->setArray( $arr );

                # Fetch existence plus the hiddencat property
                $dbr = wfGetDB( DB_SLAVE );
                $res = $dbr->select( array( 'page', 'page_props' ),
                        array( 'page_id', 'page_namespace', 'page_title', 'page_len', 'page_is_redirect', 'page_latest', 'pp_value' ),
                        $lb->constructSet( 'page', $dbr ),
                        __METHOD__,
                        array(),
                        array( 'page_props' => array( 'LEFT JOIN', array( 'pp_propname' => 'hiddencat', 'pp_page = page_id' ) ) )
                );

                # Add the results to the link cache
                $lb->addResultToCache( LinkCache::singleton(), $res );

                # Set all the values to 'normal'. This can be done with array_fill_keys in PHP 5.2.0+
                $categories = array_combine(
                        array_keys( $categories ),
                        array_fill( 0, count( $categories ), 'normal' )
                );

                # Mark hidden categories
                foreach ( $res as $row ) {
                        if ( isset( $row->pp_value ) ) {
                                $categories[$row->page_title] = 'hidden';
                        }
                }

                # Add the remaining categories to the skin
                if ( wfRunHooks( 'OutputPageMakeCategoryLinks', array( &$this, $categories, &$this->mCategoryLinks ) ) ) {
                        foreach ( $categories as $category => $type ) {
                                $origcategory = $category;
                                $title = Title::makeTitleSafe( NS_CATEGORY, $category );
                                $wgContLang->findVariantLink( $category, $title, true );
                                if ( $category != $origcategory ) {
                                        if ( array_key_exists( $category, $categories ) ) {
                                                continue;
                                        }
                                }
                                $text = $wgContLang->convertHtml( $title->getText() );
                                $this->mCategories[] = $title->getText();
                                $this->mCategoryLinks[$type][] = Linker::link( $title, $text );
                        }
                }
        }

        public function setCategoryLinks( $categories ) {
                $this->mCategoryLinks = array();
                $this->addCategoryLinks( $categories );
        }

        public function getCategoryLinks() {
                return $this->mCategoryLinks;
        }

        public function getCategories() {
                return $this->mCategories;
        }

        public function disallowUserJs() {
                $this->reduceAllowedModules(
                        ResourceLoaderModule::TYPE_SCRIPTS,
                        ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL
                );
        }

        public function isUserJsAllowed() {
                wfDeprecated( __METHOD__, '1.18' );
                return $this->getAllowedModules( ResourceLoaderModule::TYPE_SCRIPTS ) >= ResourceLoaderModule::ORIGIN_USER_INDIVIDUAL;
        }

        public function getAllowedModules( $type ) {
                if( $type == ResourceLoaderModule::TYPE_COMBINED ) {
                        return min( array_values( $this->mAllowedModules ) );
                } else {
                        return isset( $this->mAllowedModules[$type] )
                                ? $this->mAllowedModules[$type]
                                : ResourceLoaderModule::ORIGIN_ALL;
                }
        }

        public function setAllowedModules( $type, $level ) {
                $this->mAllowedModules[$type] = $level;
        }

        public function reduceAllowedModules( $type, $level ) {
                $this->mAllowedModules[$type] = min( $this->getAllowedModules( $type ), $level );
        }

        public function prependHTML( $text ) {
                $this->mBodytext = $text . $this->mBodytext;
        }

        public function addHTML( $text ) {
                $this->mBodytext .= $text;
        }

        public function addElement( $element, $attribs = array(), $contents = '' ) {
                $this->addHTML( Html::element( $element, $attribs, $contents ) );
        }

        public function clearHTML() {
                $this->mBodytext = '';
        }

        public function getHTML() {
                return $this->mBodytext;
        }

        public function parserOptions( $options = null ) {
                if ( !$this->mParserOptions ) {
                        $this->mParserOptions = ParserOptions::newFromContext( $this->getContext() );
                        $this->mParserOptions->setEditSection( false );
                }
                return wfSetVar( $this->mParserOptions, $options );
        }

        public function setRevisionId( $revid ) {
                $val = is_null( $revid ) ? null : intval( $revid );
                return wfSetVar( $this->mRevisionId, $val );
        }

        public function getRevisionId() {
                return $this->mRevisionId;
        }

        public function setRevisionTimestamp( $timestamp) {
                return wfSetVar( $this->mRevisionTimestamp, $timestamp );
        }

        public function getRevisionTimestamp() {
                return $this->mRevisionTimestamp;
        }

        public function setFileVersion( $file ) {
                $val = null;
                if ( $file instanceof File && $file->exists() ) {
                        $val = array( 'time' => $file->getTimestamp(), 'sha1' => $file->getSha1() );
                }
                return wfSetVar( $this->mFileVersion, $val, true );
        }

        public function getFileVersion() {
                return $this->mFileVersion;
        }

        public function getTemplateIds() {
                return $this->mTemplateIds;
        }

        public function getFileSearchOptions() {
                return $this->mImageTimeKeys;
        }

        public function addWikiText( $text, $linestart = true, $interface = true ) {
                $title = $this->getTitle(); // Work around E_STRICT
                if ( !$title ) {
                        throw new MWException( 'Title is null' );
                }
                $this->addWikiTextTitle( $text, $title, $linestart, /*tidy*/false, $interface );
        }

        public function addWikiTextWithTitle( $text, &$title, $linestart = true ) {
                $this->addWikiTextTitle( $text, $title, $linestart );
        }

        function addWikiTextTitleTidy( $text, &$title, $linestart = true ) {
                $this->addWikiTextTitle( $text, $title, $linestart, true );
        }

        public function addWikiTextTidy( $text, $linestart = true ) {
                $title = $this->getTitle();
                $this->addWikiTextTitleTidy( $text, $title, $linestart );
        }

        public function addWikiTextTitle( $text, Title $title, $linestart, $tidy = false, $interface = false ) {
                global $wgParser;

                wfProfileIn( __METHOD__ );

                $popts = $this->parserOptions();
                $oldTidy = $popts->setTidy( $tidy );
                $popts->setInterfaceMessage( (bool) $interface );

                $parserOutput = $wgParser->parse(
                        $text, $title, $popts,
                        $linestart, true, $this->mRevisionId
                );

                $popts->setTidy( $oldTidy );

                $this->addParserOutput( $parserOutput );

                wfProfileOut( __METHOD__ );
        }

        public function addParserOutputNoText( &$parserOutput ) {
                $this->mLanguageLinks += $parserOutput->getLanguageLinks();
                $this->addCategoryLinks( $parserOutput->getCategories() );
                $this->mNewSectionLink = $parserOutput->getNewSection();
                $this->mHideNewSectionLink = $parserOutput->getHideNewSection();

                $this->mParseWarnings = $parserOutput->getWarnings();
                if ( !$parserOutput->isCacheable() ) {
                        $this->enableClientCache( false );
                }
                $this->mNoGallery = $parserOutput->getNoGallery();
                $this->mHeadItems = array_merge( $this->mHeadItems, $parserOutput->getHeadItems() );
                $this->addModules( $parserOutput->getModules() );
                $this->addModuleScripts( $parserOutput->getModuleScripts() );
                $this->addModuleStyles( $parserOutput->getModuleStyles() );
                $this->addModuleMessages( $parserOutput->getModuleMessages() );

                // Template versioning...
                foreach ( (array)$parserOutput->getTemplateIds() as $ns => $dbks ) {
                        if ( isset( $this->mTemplateIds[$ns] ) ) {
                                $this->mTemplateIds[$ns] = $dbks + $this->mTemplateIds[$ns];
                        } else {
                                $this->mTemplateIds[$ns] = $dbks;
                        }
                }
                // File versioning...
                foreach ( (array)$parserOutput->getFileSearchOptions() as $dbk => $data ) {
                        $this->mImageTimeKeys[$dbk] = $data;
                }

                // Hooks registered in the object
                global $wgParserOutputHooks;
                foreach ( $parserOutput->getOutputHooks() as $hookInfo ) {
                        list( $hookName, $data ) = $hookInfo;
                        if ( isset( $wgParserOutputHooks[$hookName] ) ) {
                                call_user_func( $wgParserOutputHooks[$hookName], $this, $parserOutput, $data );
                        }
                }

                wfRunHooks( 'OutputPageParserOutput', array( &$this, $parserOutput ) );
        }

        function addParserOutput( &$parserOutput ) {
                $this->addParserOutputNoText( $parserOutput );
                $text = $parserOutput->getText();
                wfRunHooks( 'OutputPageBeforeHTML', array( &$this, &$text ) );
                $this->addHTML( $text );
        }

        public function addTemplate( &$template ) {
                ob_start();
                $template->execute();
                $this->addHTML( ob_get_contents() );
                ob_end_clean();
        }

        public function parse( $text, $linestart = true, $interface = false, $language = null ) {
                global $wgParser;

                if( is_null( $this->getTitle() ) ) {
                        throw new MWException( 'Empty $mTitle in ' . __METHOD__ );
                }

                $popts = $this->parserOptions();
                if ( $interface ) {
                        $popts->setInterfaceMessage( true );
                }
                if ( $language !== null ) {
                        $oldLang = $popts->setTargetLanguage( $language );
                }

                $parserOutput = $wgParser->parse(
                        $text, $this->getTitle(), $popts,
                        $linestart, true, $this->mRevisionId
                );

                if ( $interface ) {
                        $popts->setInterfaceMessage( false );
                }
                if ( $language !== null ) {
                        $popts->setTargetLanguage( $oldLang );
                }

                return $parserOutput->getText();
        }

        public function parseInline( $text, $linestart = true, $interface = false ) {
                $parsed = $this->parse( $text, $linestart, $interface );

                $m = array();
                if ( preg_match( '/^<p>(.*)\n?<\/p>\n?/sU', $parsed, $m ) ) {
                        $parsed = $m[1];
                }

                return $parsed;
        }

        public function setSquidMaxage( $maxage ) {
                $this->mSquidMaxage = $maxage;
        }

        public function enableClientCache( $state ) {
                return wfSetVar( $this->mEnableClientCache, $state );
        }

        function getCacheVaryCookies() {
                global $wgCookiePrefix, $wgCacheVaryCookies;
                static $cookies;
                if ( $cookies === null ) {
                        $cookies = array_merge(
                                array(
                                        "{$wgCookiePrefix}Token",
                                        "{$wgCookiePrefix}LoggedOut",
                                        session_name()
                                ),
                                $wgCacheVaryCookies
                        );
                        wfRunHooks( 'GetCacheVaryCookies', array( $this, &$cookies ) );
                }
                return $cookies;
        }

        function haveCacheVaryCookies() {
                $cookieHeader = $this->getRequest()->getHeader( 'cookie' );
                if ( $cookieHeader === false ) {
                        return false;
                }
                $cvCookies = $this->getCacheVaryCookies();
                foreach ( $cvCookies as $cookieName ) {
                        # Check for a simple string match, like the way squid does it
                        if ( strpos( $cookieHeader, $cookieName ) !== false ) {
                                wfDebug( __METHOD__ . ": found $cookieName\n" );
                                return true;
                        }
                }
                wfDebug( __METHOD__ . ": no cache-varying cookies found\n" );
                return false;
        }

        public function addVaryHeader( $header, $option = null ) {
                if ( !array_key_exists( $header, $this->mVaryHeader ) ) {
                        $this->mVaryHeader[$header] = (array)$option;
                } elseif( is_array( $option ) ) {
                        if( is_array( $this->mVaryHeader[$header] ) ) {
                                $this->mVaryHeader[$header] = array_merge( $this->mVaryHeader[$header], $option );
                        } else {
                                $this->mVaryHeader[$header] = $option;
                        }
                }
                $this->mVaryHeader[$header] = array_unique( (array)$this->mVaryHeader[$header] );
        }

        public function getVaryHeader() {
                return 'Vary: ' . join( ', ', array_keys( $this->mVaryHeader ) );
        }

        public function getXVO() {
                $cvCookies = $this->getCacheVaryCookies();

                $cookiesOption = array();
                foreach ( $cvCookies as $cookieName ) {
                        $cookiesOption[] = 'string-contains=' . $cookieName;
                }
                $this->addVaryHeader( 'Cookie', $cookiesOption );

                $headers = array();
                foreach( $this->mVaryHeader as $header => $option ) {
                        $newheader = $header;
                        if ( is_array( $option ) && count( $option ) > 0 ) {
                                $newheader .= ';' . implode( ';', $option );
                        }
                        $headers[] = $newheader;
                }
                $xvo = 'X-Vary-Options: ' . implode( ',', $headers );

                return $xvo;
        }

        function addAcceptLanguage() {
                $lang = $this->getTitle()->getPageLanguage();
                if( !$this->getRequest()->getCheck( 'variant' ) && $lang->hasVariants() ) {
                        $variants = $lang->getVariants();
                        $aloption = array();
                        foreach ( $variants as $variant ) {
                                if( $variant === $lang->getCode() ) {
                                        continue;
                                } else {
                                        $aloption[] = 'string-contains=' . $variant;

                                        // IE and some other browsers use BCP 47 standards in
                                        // their Accept-Language header, like "zh-CN" or "zh-Hant".
                                        // We should handle these too.
                                        $variantBCP47 = wfBCP47( $variant );
                                        if ( $variantBCP47 !== $variant ) {
                                                $aloption[] = 'string-contains=' . $variantBCP47;
                                        }
                                }
                        }
                        $this->addVaryHeader( 'Accept-Language', $aloption );
                }
        }

        public function preventClickjacking( $enable = true ) {
                $this->mPreventClickjacking = $enable;
        }

        public function allowClickjacking() {
                $this->mPreventClickjacking = false;
        }

        public function getFrameOptions() {
                global $wgBreakFrames, $wgEditPageFrameOptions;
                if ( $wgBreakFrames ) {
                        return 'DENY';
                } elseif ( $this->mPreventClickjacking && $wgEditPageFrameOptions ) {
                        return $wgEditPageFrameOptions;
                }
                return false;
        }

        public function sendCacheControl() {
                global $wgUseSquid, $wgUseESI, $wgUseETag, $wgSquidMaxage, $wgUseXVO;

                $response = $this->getRequest()->response();
                if ( $wgUseETag && $this->mETag ) {
                        $response->header( "ETag: $this->mETag" );
                }

                $this->addVaryHeader( 'Cookie' );
                $this->addAcceptLanguage();

                # don't serve compressed data to clients who can't handle it
                # maintain different caches for logged-in users and non-logged in ones
                $response->header( $this->getVaryHeader() );

                if ( $wgUseXVO ) {
                        # Add an X-Vary-Options header for Squid with Wikimedia patches
                        $response->header( $this->getXVO() );
                }

                if( $this->mEnableClientCache ) {
                        if(
                                $wgUseSquid && session_id() == '' && !$this->isPrintable() &&
                                $this->mSquidMaxage != 0 && !$this->haveCacheVaryCookies()
                        )
                        {
                                if ( $wgUseESI ) {
                                        # We'll purge the proxy cache explicitly, but require end user agents
                                        # to revalidate against the proxy on each visit.
                                        # Surrogate-Control controls our Squid, Cache-Control downstream caches
                                        wfDebug( __METHOD__ . ": proxy caching with ESI; {$this->mLastModified} **\n", false );
                                        # start with a shorter timeout for initial testing
                                        # header( 'Surrogate-Control: max-age=2678400+2678400, content="ESI/1.0"');
                                        $response->header( 'Surrogate-Control: max-age=' . $wgSquidMaxage . '+' . $this->mSquidMaxage . ', content="ESI/1.0"' );
                                        $response->header( 'Cache-Control: s-maxage=0, must-revalidate, max-age=0' );
                                } else {
                                        # We'll purge the proxy cache for anons explicitly, but require end user agents
                                        # to revalidate against the proxy on each visit.
                                        # IMPORTANT! The Squid needs to replace the Cache-Control header with
                                        # Cache-Control: s-maxage=0, must-revalidate, max-age=0
                                        wfDebug( __METHOD__ . ": local proxy caching; {$this->mLastModified} **\n", false );
                                        # start with a shorter timeout for initial testing
                                        # header( "Cache-Control: s-maxage=2678400, must-revalidate, max-age=0" );
                                        $response->header( 'Cache-Control: s-maxage=' . $this->mSquidMaxage . ', must-revalidate, max-age=0' );
                                }
                        } else {
                                # We do want clients to cache if they can, but they *must* check for updates
                                # on revisiting the page.
                                wfDebug( __METHOD__ . ": private caching; {$this->mLastModified} **\n", false );
                                $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
                                $response->header( "Cache-Control: private, must-revalidate, max-age=0" );
                        }
                        if( $this->mLastModified ) {
                                $response->header( "Last-Modified: {$this->mLastModified}" );
                        }
                } else {
                        wfDebug( __METHOD__ . ": no caching **\n", false );

                        # In general, the absence of a last modified header should be enough to prevent
                        # the client from using its cache. We send a few other things just to make sure.
                        $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
                        $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
                        $response->header( 'Pragma: no-cache' );
                }
        }

        public static function getStatusMessage( $code ) {
                wfDeprecated( __METHOD__, '1.18' );
                return HttpStatus::getMessage( $code );
        }

        public function output() {
                global $wgLanguageCode, $wgDebugRedirects, $wgMimeType, $wgVaryOnXFP;

                if( $this->mDoNothing ) {
                        return;
                }

                wfProfileIn( __METHOD__ );

                $response = $this->getRequest()->response();

                if ( $this->mRedirect != '' ) {
                        # Standards require redirect URLs to be absolute
                        $this->mRedirect = wfExpandUrl( $this->mRedirect, PROTO_CURRENT );

                        $redirect = $this->mRedirect;
                        $code = $this->mRedirectCode;

                        if( wfRunHooks( "BeforePageRedirect", array( $this, &$redirect, &$code ) ) ) {
                                if( $code == '301' || $code == '303' ) {
                                        if( !$wgDebugRedirects ) {
                                                $message = HttpStatus::getMessage( $code );
                                                $response->header( "HTTP/1.1 $code $message" );
                                        }
                                        $this->mLastModified = wfTimestamp( TS_RFC2822 );
                                }
                                if ( $wgVaryOnXFP ) {
                                        $this->addVaryHeader( 'X-Forwarded-Proto' );
                                }
                                $this->sendCacheControl();

                                $response->header( "Content-Type: text/html; charset=utf-8" );
                                if( $wgDebugRedirects ) {
                                        $url = htmlspecialchars( $redirect );
                                        print "<html>\n<head>\n<title>Redirect</title>\n</head>\n<body>\n";
                                        print "<p>Location: <a href=\"$url\">$url</a></p>\n";
                                        print "</body>\n</html>\n";
                                } else {
                                        $response->header( 'Location: ' . $redirect );
                                }
                        }

                        wfProfileOut( __METHOD__ );
                        return;
                } elseif ( $this->mStatusCode ) {
                        $message = HttpStatus::getMessage( $this->mStatusCode );
                        if ( $message ) {
                                $response->header( 'HTTP/1.1 ' . $this->mStatusCode . ' ' . $message );
                        }
                }

                # Buffer output; final headers may depend on later processing
                ob_start();

                $response->header( "Content-type: $wgMimeType; charset=UTF-8" );
                $response->header( 'Content-language: ' . $wgLanguageCode );

                // Prevent framing, if requested
                $frameOptions = $this->getFrameOptions();
                if ( $frameOptions ) {
                        $response->header( "X-Frame-Options: $frameOptions" );
                }

                if ( $this->mArticleBodyOnly ) {
                        $this->out( $this->mBodytext );
                } else {
                        $this->addDefaultModules();

                        $sk = $this->getSkin();

                        // Hook that allows last minute changes to the output page, e.g.
                        // adding of CSS or Javascript by extensions.
                        wfRunHooks( 'BeforePageDisplay', array( &$this, &$sk ) );

                        wfProfileIn( 'Output-skin' );
                        $sk->outputPage();
                        wfProfileOut( 'Output-skin' );
                }

                // This hook allows last minute changes to final overall output by modifying output buffer
                wfRunHooks( 'AfterFinalPageOutput', array( $this ) );

                $this->sendCacheControl();

                ob_end_flush();

                wfProfileOut( __METHOD__ );
        }

        public function out( $ins ) {
                print $ins;
        }

        function blockedPage() {
                throw new UserBlockedError( $this->getUser()->mBlock );
        }

        public function prepareErrorPage( $pageTitle, $htmlTitle = false ) {
                $this->setPageTitle( $pageTitle );
                if ( $htmlTitle !== false ) {
                        $this->setHTMLTitle( $htmlTitle );
                }
                $this->setRobotPolicy( 'noindex,nofollow' );
                $this->setArticleRelated( false );
                $this->enableClientCache( false );
                $this->mRedirect = '';
                $this->clearSubtitle();
                $this->clearHTML();
        }

        public function showErrorPage( $title, $msg, $params = array() ) {
                if( !$title instanceof Message ) {
                        $title = $this->msg( $title );
                }

                $this->prepareErrorPage( $title );

                if ( $msg instanceof Message ) {
                        $this->addHTML( $msg->parseAsBlock() );
                } else {
                        $this->addWikiMsgArray( $msg, $params );
                }

                $this->returnToMain();
        }

        public function showPermissionsErrorPage( $errors, $action = null ) {
                // For some action (read, edit, create and upload), display a "login to do this action"
                // error if all of the following conditions are met:
                // 1. the user is not logged in
                // 2. the only error is insufficient permissions (i.e. no block or something else)
                // 3. the error can be avoided simply by logging in
                if ( in_array( $action, array( 'read', 'edit', 'createpage', 'createtalk', 'upload' ) )
                        && $this->getUser()->isAnon() && count( $errors ) == 1 && isset( $errors[0][0] )
                        && ( $errors[0][0] == 'badaccess-groups' || $errors[0][0] == 'badaccess-group0' )
                        && ( User::groupHasPermission( 'user', $action )
                        || User::groupHasPermission( 'autoconfirmed', $action ) )
                ) {
                        $displayReturnto = null;

                        # Due to bug 32276, 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.
                        $request = $this->getRequest();
                        $returnto = Title::newFromURL( $request->getVal( 'title', '' ) );
                        if ( $action == 'edit' ) {
                                $msg = 'whitelistedittext';
                                $displayReturnto = $returnto;
                        } elseif ( $action == 'createpage' || $action == 'createtalk' ) {
                                $msg = 'nocreatetext';
                        } elseif ( $action == 'upload' ) {
                                $msg = 'uploadnologintext';
                        } else { # Read
                                $msg = 'loginreqpagetext';
                                $displayReturnto = Title::newMainPage();
                        }

                        $query = array();

                        if ( $returnto ) {
                                $query['returnto'] = $returnto->getPrefixedText();

                                if ( !$request->wasPosted() ) {
                                        $returntoquery = $request->getValues();
                                        unset( $returntoquery['title'] );
                                        unset( $returntoquery['returnto'] );
                                        unset( $returntoquery['returntoquery'] );
                                        $query['returntoquery'] = wfArrayToCgi( $returntoquery );
                                }
                        }
                        $loginLink = Linker::linkKnown(
                                SpecialPage::getTitleFor( 'Userlogin' ),
                                $this->msg( 'loginreqlink' )->escaped(),
                                array(),
                                $query
                        );

                        $this->prepareErrorPage( $this->msg( 'loginreqtitle' ) );
                        $this->addHTML( $this->msg( $msg )->rawParams( $loginLink )->parse() );

                        # Don't return to a page the user can't read otherwise
                        # we'll end up in a pointless loop
                        if ( $displayReturnto && $displayReturnto->userCan( 'read', $this->getUser() ) ) {
                                $this->returnToMain( null, $displayReturnto );
                        }
                } else {
                        $this->prepareErrorPage( $this->msg( 'permissionserrors' ) );
                        $this->addWikiText( $this->formatPermissionsErrorMessage( $errors, $action ) );
                }
        }

        public function versionRequired( $version ) {
                $this->prepareErrorPage( $this->msg( 'versionrequired', $version ) );

                $this->addWikiMsg( 'versionrequiredtext', $version );
                $this->returnToMain();
        }

        public function permissionRequired( $permission ) {
                throw new PermissionsError( $permission );
        }

        public function loginToUse() {
                throw new PermissionsError( 'read' );
        }

        public function formatPermissionsErrorMessage( $errors, $action = null ) {
                if ( $action == null ) {
                        $text = $this->msg( 'permissionserrorstext', count( $errors ) )->plain() . "\n\n";
                } else {
                        $action_desc = $this->msg( "action-$action" )->plain();
                        $text = $this->msg(
                                'permissionserrorstext-withaction',
                                count( $errors ),
                                $action_desc
                        )->plain() . "\n\n";
                }

                if ( count( $errors ) > 1 ) {
                        $text .= '<ul class="permissions-errors">' . "\n";

                        foreach( $errors as $error ) {
                                $text .= '<li>';
                                $text .= call_user_func_array( array( $this, 'msg' ), $error )->plain();
                                $text .= "</li>\n";
                        }
                        $text .= '</ul>';
                } else {
                        $text .= "<div class=\"permissions-errors\">\n" .
                                        call_user_func_array( array( $this, 'msg' ), reset( $errors ) )->plain() .
                                        "\n</div>";
                }

                return $text;
        }

        public function readOnlyPage( $source = null, $protected = false, $reasons = array(), $action = null ) {
                $this->setRobotPolicy( 'noindex,nofollow' );
                $this->setArticleRelated( false );

                // If no reason is given, just supply a default "I can't let you do
                // that, Dave" message.  Should only occur if called by legacy code.
                if ( $protected && empty( $reasons ) ) {
                        $reasons[] = array( 'badaccess-group0' );
                }

                if ( !empty( $reasons ) ) {
                        // Permissions error
                        if( $source ) {
                                $this->setPageTitle( $this->msg( 'viewsource-title', $this->getTitle()->getPrefixedText() ) );
                                $this->addBacklinkSubtitle( $this->getTitle() );
                        } else {
                                $this->setPageTitle( $this->msg( 'badaccess' ) );
                        }
                        $this->addWikiText( $this->formatPermissionsErrorMessage( $reasons, $action ) );
                } else {
                        // Wiki is read only
                        throw new ReadOnlyError;
                }

                // Show source, if supplied
                if( is_string( $source ) ) {
                        $this->addWikiMsg( 'viewsourcetext' );

                        $pageLang = $this->getTitle()->getPageLanguage();
                        $params = array(
                                'id' => 'wpTextbox1',
                                'name' => 'wpTextbox1',
                                'cols' => $this->getUser()->getOption( 'cols' ),
                                'rows' => $this->getUser()->getOption( 'rows' ),
                                'readonly' => 'readonly',
                                'lang' => $pageLang->getHtmlCode(),
                                'dir' => $pageLang->getDir(),
                        );
                        $this->addHTML( Html::element( 'textarea', $params, $source ) );

                        // Show templates used by this article
                        $templates = Linker::formatTemplates( $this->getTitle()->getTemplateLinksFrom() );
                        $this->addHTML( "<div class='templatesUsed'>
$templates
</div>
" );
                }

                # If the title doesn't exist, it's fairly pointless to print a return
                # link to it.  After all, you just tried editing it and couldn't, so
                # what's there to do there?
                if( $this->getTitle()->exists() ) {
                        $this->returnToMain( null, $this->getTitle() );
                }
        }

        public function rateLimited() {
                throw new ThrottledError;
        }

        public function showLagWarning( $lag ) {
                global $wgSlaveLagWarning, $wgSlaveLagCritical;
                if( $lag >= $wgSlaveLagWarning ) {
                        $message = $lag < $wgSlaveLagCritical
                                ? 'lag-warn-normal'
                                : 'lag-warn-high';
                        $wrap = Html::rawElement( 'div', array( 'class' => "mw-{$message}" ), "\n$1\n" );
                        $this->wrapWikiMsg( "$wrap\n", array( $message, $this->getLanguage()->formatNum( $lag ) ) );
                }
        }

        public function showFatalError( $message ) {
                $this->prepareErrorPage( $this->msg( 'internalerror' ) );

                $this->addHTML( $message );
        }

        public function showUnexpectedValueError( $name, $val ) {
                $this->showFatalError( $this->msg( 'unexpected', $name, $val )->text() );
        }

        public function showFileCopyError( $old, $new ) {
                $this->showFatalError( $this->msg( 'filecopyerror', $old, $new )->text() );
        }

        public function showFileRenameError( $old, $new ) {
                $this->showFatalError( $this->msg( 'filerenameerror', $old, $new )->text() );
        }

        public function showFileDeleteError( $name ) {
                $this->showFatalError( $this->msg( 'filedeleteerror', $name )->text() );
        }

        public function showFileNotFoundError( $name ) {
                $this->showFatalError( $this->msg( 'filenotfound', $name )->text() );
        }

        public function addReturnTo( $title, $query = array(), $text = null, $options = array() ) {
                if( in_array( 'http', $options ) ) {
                        $proto = PROTO_HTTP;
                } elseif( in_array( 'https', $options ) ) {
                        $proto = PROTO_HTTPS;
                } else {
                        $proto = PROTO_RELATIVE;
                }

                $this->addLink( array( 'rel' => 'next', 'href' => $title->getFullURL( '', false, $proto ) ) );
                $link = $this->msg( 'returnto' )->rawParams(
                        Linker::link( $title, $text, array(), $query, $options ) )->escaped();
                $this->addHTML( "<p id=\"mw-returnto\">{$link}</p>\n" );
        }

        public function returnToMain( $unused = null, $returnto = null, $returntoquery = null ) {
                if ( $returnto == null ) {
                        $returnto = $this->getRequest()->getText( 'returnto' );
                }

                if ( $returntoquery == null ) {
                        $returntoquery = $this->getRequest()->getText( 'returntoquery' );
                }

                if ( $returnto === '' ) {
                        $returnto = Title::newMainPage();
                }

                if ( is_object( $returnto ) ) {
                        $titleObj = $returnto;
                } else {
                        $titleObj = Title::newFromText( $returnto );
                }
                if ( !is_object( $titleObj ) ) {
                        $titleObj = Title::newMainPage();
                }

                $this->addReturnTo( $titleObj, wfCgiToArray( $returntoquery ) );
        }

        public function headElement( Skin $sk, $includeStyle = true ) {
                global $wgContLang;

                $userdir = $this->getLanguage()->getDir();
                $sitedir = $wgContLang->getDir();

                if ( $sk->commonPrintStylesheet() ) {
                        $this->addModuleStyles( 'mediawiki.legacy.wikiprintable' );
                }

                $ret = Html::htmlHeader( array( 'lang' => $this->getLanguage()->getHtmlCode(), 'dir' => $userdir, 'class' => 'client-nojs' ) );

                if ( $this->getHTMLTitle() == '' ) {
                        $this->setHTMLTitle( $this->msg( 'pagetitle', $this->getPageTitle() ) );
                }

                $openHead = Html::openElement( 'head' );
                if ( $openHead ) {
                        # Don't bother with the newline if $head == ''
                        $ret .= "$openHead\n";
                }

                $ret .= Html::element( 'title', null, $this->getHTMLTitle() ) . "\n";

                $ret .= implode( "\n", array(
                        $this->getHeadLinks( null, true ),
                        $this->buildCssLinks(),
                        $this->getHeadScripts(),
                        $this->getHeadItems()
                ) );

                $closeHead = Html::closeElement( 'head' );
                if ( $closeHead ) {
                        $ret .= "$closeHead\n";
                }

                $bodyAttrs = array();

                # Classes for LTR/RTL directionality support
                $bodyAttrs['class'] = "mediawiki $userdir sitedir-$sitedir";

                if ( $this->getLanguage()->capitalizeAllNouns() ) {
                        # A <body> class is probably not the best way to do this . . .
                        $bodyAttrs['class'] .= ' capitalize-all-nouns';
                }
                $bodyAttrs['class'] .= ' ' . $sk->getPageClasses( $this->getTitle() );
                $bodyAttrs['class'] .= ' skin-' . Sanitizer::escapeClass( $sk->getSkinName() );
                $bodyAttrs['class'] .= ' action-' . Sanitizer::escapeClass( Action::getActionName( $this->getContext() ) );

                $sk->addToBodyAttributes( $this, $bodyAttrs ); // Allow skins to add body attributes they need
                wfRunHooks( 'OutputPageBodyAttributes', array( $this, $sk, &$bodyAttrs ) );

                $ret .= Html::openElement( 'body', $bodyAttrs ) . "\n";

                return $ret;
        }

        private function addDefaultModules() {
                global $wgIncludeLegacyJavaScript, $wgPreloadJavaScriptMwUtil, $wgUseAjax,
                        $wgAjaxWatch, $wgResponsiveImages;

                // Add base resources
                $this->addModules( array(
                        'mediawiki.user',
                        'mediawiki.page.startup',
                        'mediawiki.page.ready',
                ) );
                if ( $wgIncludeLegacyJavaScript ) {
                        $this->addModules( 'mediawiki.legacy.wikibits' );
                }

                if ( $wgPreloadJavaScriptMwUtil ) {
                        $this->addModules( 'mediawiki.util' );
                }

                MWDebug::addModules( $this );

                // Add various resources if required
                if ( $wgUseAjax ) {
                        $this->addModules( 'mediawiki.legacy.ajax' );

                        wfRunHooks( 'AjaxAddScript', array( &$this ) );

                        if( $wgAjaxWatch && $this->getUser()->isLoggedIn() ) {
                                $this->addModules( 'mediawiki.page.watch.ajax' );
                        }

                        if ( !$this->getUser()->getOption( 'disablesuggest', false ) ) {
                                $this->addModules( 'mediawiki.searchSuggest' );
                        }
                }

                if ( $this->getUser()->getBoolOption( 'editsectiononrightclick' ) ) {
                        $this->addModules( 'mediawiki.action.view.rightClickEdit' );
                }

                # Crazy edit-on-double-click stuff
                if ( $this->isArticle() && $this->getUser()->getOption( 'editondblclick' ) ) {
                        $this->addModules( 'mediawiki.action.view.dblClickEdit' );
                }

                // Support for high-density display images
                if ( $wgResponsiveImages ) {
                        $this->addModules( 'mediawiki.hidpi' );
                }
        }

        public function getResourceLoader() {
                if ( is_null( $this->mResourceLoader ) ) {
                        $this->mResourceLoader = new ResourceLoader();
                }
                return $this->mResourceLoader;
        }

        protected function makeResourceLoaderLink( $modules, $only, $useESI = false, array $extraQuery = array(), $loadCall = false ) {
                global $wgResourceLoaderUseESI;

                $modules = (array) $modules;

                if ( !count( $modules ) ) {
                        return '';
                }

                if ( count( $modules ) > 1 ) {
                        // Remove duplicate module requests
                        $modules = array_unique( $modules );
                        // Sort module names so requests are more uniform
                        sort( $modules );

                        if ( ResourceLoader::inDebugMode() ) {
                                // Recursively call us for every item
                                $links = '';
                                foreach ( $modules as $name ) {
                                        $links .= $this->makeResourceLoaderLink( $name, $only, $useESI );
                                }
                                return $links;
                        }
                }

                // Create keyed-by-group list of module objects from modules list
                $groups = array();
                $resourceLoader = $this->getResourceLoader();
                foreach ( $modules as $name ) {
                        $module = $resourceLoader->getModule( $name );
                        # Check that we're allowed to include this module on this page
                        if ( !$module
                                || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_SCRIPTS )
                                        && $only == ResourceLoaderModule::TYPE_SCRIPTS )
                                || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_STYLES )
                                        && $only == ResourceLoaderModule::TYPE_STYLES )
                                )
                        {
                                continue;
                        }

                        $group = $module->getGroup();
                        if ( !isset( $groups[$group] ) ) {
                                $groups[$group] = array();
                        }
                        $groups[$group][$name] = $module;
                }

                $links = '';
                foreach ( $groups as $group => $grpModules ) {
                        // Special handling for user-specific groups
                        $user = null;
                        if ( ( $group === 'user' || $group === 'private' ) && $this->getUser()->isLoggedIn() ) {
                                $user = $this->getUser()->getName();
                        }

                        // Create a fake request based on the one we are about to make so modules return
                        // correct timestamp and emptiness data
                        $query = ResourceLoader::makeLoaderQuery(
                                array(), // modules; not determined yet
                                $this->getLanguage()->getCode(),
                                $this->getSkin()->getSkinName(),
                                $user,
                                null, // version; not determined yet
                                ResourceLoader::inDebugMode(),
                                $only === ResourceLoaderModule::TYPE_COMBINED ? null : $only,
                                $this->isPrintable(),
                                $this->getRequest()->getBool( 'handheld' ),
                                $extraQuery
                        );
                        $context = new ResourceLoaderContext( $resourceLoader, new FauxRequest( $query ) );
                        // Extract modules that know they're empty
                        $emptyModules = array ();
                        foreach ( $grpModules as $key => $module ) {
                                if ( $module->isKnownEmpty( $context ) ) {
                                        $emptyModules[$key] = 'ready';
                                        unset( $grpModules[$key] );
                                }
                        }
                        // Inline empty modules: since they're empty, just mark them as 'ready'
                        if ( count( $emptyModules ) > 0 && $only !== ResourceLoaderModule::TYPE_STYLES ) {
                                // If we're only getting the styles, we don't need to do anything for empty modules.
                                $links .= Html::inlineScript(

                                                ResourceLoader::makeLoaderConditionalScript(

                                                                ResourceLoader::makeLoaderStateScript( $emptyModules )

                                                )

                                ) . "\n";
                        }

                        // If there are no modules left, skip this group
                        if ( count( $grpModules ) === 0 ) {
                                continue;
                        }

                        // Inline private modules. These can't be loaded through load.php for security
                        // reasons, see bug 34907. Note that these modules should be loaded from
                        // getHeadScripts() before the first loader call. Otherwise other modules can't
                        // properly use them as dependencies (bug 30914)
                        if ( $group === 'private' ) {
                                if ( $only == ResourceLoaderModule::TYPE_STYLES ) {
                                        $links .= Html::inlineStyle(
                                                $resourceLoader->makeModuleResponse( $context, $grpModules )
                                        );
                                } else {
                                        $links .= Html::inlineScript(
                                                ResourceLoader::makeLoaderConditionalScript(
                                                        $resourceLoader->makeModuleResponse( $context, $grpModules )
                                                )
                                        );
                                }
                                $links .= "\n";
                                continue;
                        }
                        // Special handling for the user group; because users might change their stuff
                        // on-wiki like user pages, or user preferences; we need to find the highest
                        // timestamp of these user-changeable modules so we can ensure cache misses on change
                        // This should NOT be done for the site group (bug 27564) because anons get that too
                        // and we shouldn't be putting timestamps in Squid-cached HTML
                        $version = null;
                        if ( $group === 'user' ) {
                                // Get the maximum timestamp
                                $timestamp = 1;
                                foreach ( $grpModules as $module ) {
                                        $timestamp = max( $timestamp, $module->getModifiedTime( $context ) );
                                }
                                // Add a version parameter so cache will break when things change
                                $version = wfTimestamp( TS_ISO_8601_BASIC, $timestamp );
                        }

                        $url = ResourceLoader::makeLoaderURL(
                                array_keys( $grpModules ),
                                $this->getLanguage()->getCode(),
                                $this->getSkin()->getSkinName(),
                                $user,
                                $version,
                                ResourceLoader::inDebugMode(),
                                $only === ResourceLoaderModule::TYPE_COMBINED ? null : $only,
                                $this->isPrintable(),
                                $this->getRequest()->getBool( 'handheld' ),
                                $extraQuery
                        );
                        if ( $useESI && $wgResourceLoaderUseESI ) {
                                $esi = Xml::element( 'esi:include', array( 'src' => $url ) );
                                if ( $only == ResourceLoaderModule::TYPE_STYLES ) {
                                        $link = Html::inlineStyle( $esi );
                                } else {
                                        $link = Html::inlineScript( $esi );
                                }
                        } else {
                                // Automatically select style/script elements
                                if ( $only === ResourceLoaderModule::TYPE_STYLES ) {
                                        $link = Html::linkedStyle( $url );
                                } else if ( $loadCall ) {
                                        $link = Html::inlineScript(
                                                ResourceLoader::makeLoaderConditionalScript(
                                                        Xml::encodeJsCall( 'mw.loader.load', array( $url, 'text/javascript', true ) )
                                                )
                                        );
                                } else {
                                        $link = Html::linkedScript( $url );
                                }
                        }

                        if( $group == 'noscript' ) {
                                $links .= Html::rawElement( 'noscript', array(), $link ) . "\n";
                        } else {
                                $links .= $link . "\n";
                        }
                }
                return $links;
        }

        function getHeadScripts() {
                global $wgResourceLoaderExperimentalAsyncLoading;

                // Startup - this will immediately load jquery and mediawiki modules
                $scripts = $this->makeResourceLoaderLink( 'startup', ResourceLoaderModule::TYPE_SCRIPTS, true );

                // Load config before anything else
                $scripts .= Html::inlineScript(
                        ResourceLoader::makeLoaderConditionalScript(
                                ResourceLoader::makeConfigSetScript( $this->getJSVars() )
                        )
                );

                // Load embeddable private modules before any loader links
                // This needs to be TYPE_COMBINED so these modules are properly wrapped
                // in mw.loader.implement() calls and deferred until mw.user is available
                $embedScripts = array( 'user.options', 'user.tokens' );
                $scripts .= $this->makeResourceLoaderLink( $embedScripts, ResourceLoaderModule::TYPE_COMBINED );

                // Script and Messages "only" requests marked for top inclusion
                // Messages should go first
                $scripts .= $this->makeResourceLoaderLink( $this->getModuleMessages( true, 'top' ), ResourceLoaderModule::TYPE_MESSAGES );
                $scripts .= $this->makeResourceLoaderLink( $this->getModuleScripts( true, 'top' ), ResourceLoaderModule::TYPE_SCRIPTS );

                // Modules requests - let the client calculate dependencies and batch requests as it likes
                // Only load modules that have marked themselves for loading at the top
                $modules = $this->getModules( true, 'top' );
                if ( $modules ) {
                        $scripts .= Html::inlineScript(
                                ResourceLoader::makeLoaderConditionalScript(
                                        Xml::encodeJsCall( 'mw.loader.load', array( $modules ) )
                                )
                        );
                }

                if ( $wgResourceLoaderExperimentalAsyncLoading ) {
                        $scripts .= $this->getScriptsForBottomQueue( true );
                }

                return $scripts;
        }

        function getScriptsForBottomQueue( $inHead ) {
                global $wgUseSiteJs, $wgAllowUserJs;

                // Script and Messages "only" requests marked for bottom inclusion
                // If we're in the <head>, use load() calls rather than <script src="..."> tags
                // Messages should go first
                $scripts = $this->makeResourceLoaderLink( $this->getModuleMessages( true, 'bottom' ),
                        ResourceLoaderModule::TYPE_MESSAGES, /* $useESI = */ false, /* $extraQuery = */ array(),
                        /* $loadCall = */ $inHead
                );
                $scripts .= $this->makeResourceLoaderLink( $this->getModuleScripts( true, 'bottom' ),
                        ResourceLoaderModule::TYPE_SCRIPTS, /* $useESI = */ false, /* $extraQuery = */ array(),
                        /* $loadCall = */ $inHead
                );

                // Modules requests - let the client calculate dependencies and batch requests as it likes
                // Only load modules that have marked themselves for loading at the bottom
                $modules = $this->getModules( true, 'bottom' );
                if ( $modules ) {
                        $scripts .= Html::inlineScript(
                                ResourceLoader::makeLoaderConditionalScript(
                                        Xml::encodeJsCall( 'mw.loader.load', array( $modules, null, true ) )
                                )
                        );
                }

                // Legacy Scripts
                $scripts .= "\n" . $this->mScripts;

                $defaultModules = array();

                // Add site JS if enabled
                if ( $wgUseSiteJs ) {
                        $scripts .= $this->makeResourceLoaderLink( 'site', ResourceLoaderModule::TYPE_SCRIPTS,
                                /* $useESI = */ false, /* $extraQuery = */ array(), /* $loadCall = */ $inHead
                        );
                        $defaultModules['site'] = 'loading';
                } else {
                        // The wiki is configured to not allow a site module.
                        $defaultModules['site'] = 'missing';
                }

                // Add user JS if enabled
                if ( $wgAllowUserJs ) {
                        if ( $this->getUser()->isLoggedIn() ) {
                                if( $this->getTitle() && $this->getTitle()->isJsSubpage() && $this->userCanPreview() ) {
                                        # XXX: additional security check/prompt?
                                        // We're on a preview of a JS subpage
                                        // Exclude this page from the user module in case it's in there (bug 26283)
                                        $scripts .= $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_SCRIPTS, false,
                                                array( 'excludepage' => $this->getTitle()->getPrefixedDBkey() ), $inHead
                                        );
                                        // Load the previewed JS
                                        $scripts .= Html::inlineScript( "\n" . $this->getRequest()->getText( 'wpTextbox1' ) . "\n" ) . "\n";
                                        // FIXME: If the user is previewing, say, ./vector.js, his ./common.js will be loaded
                                        // asynchronously and may arrive *after* the inline script here. So the previewed code
                                        // may execute before ./common.js runs. Normally, ./common.js runs before ./vector.js...
                                } else {
                                        // Include the user module normally, i.e., raw to avoid it being wrapped in a closure.
                                        $scripts .= $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_SCRIPTS,
                                                /* $useESI = */ false, /* $extraQuery = */ array(), /* $loadCall = */ $inHead
                                        );
                                }
                                $defaultModules['user'] = 'loading';
                        } else {
                                // Non-logged-in users have no user module. Treat it as empty and 'ready' to avoid
                                // blocking default gadgets that might depend on it. Although arguably default-enabled
                                // gadgets should not depend on the user module, it's harmless and less error-prone to
                                // handle this case.
                                $defaultModules['user'] = 'ready';
                        }
                } else {
                        // User JS disabled
                        $defaultModules['user'] = 'missing';
                }

                // Group JS is only enabled if site JS is enabled.
                if ( $wgUseSiteJs ) {
                        if ( $this->getUser()->isLoggedIn() ) {
                                $scripts .= $this->makeResourceLoaderLink( 'user.groups', ResourceLoaderModule::TYPE_COMBINED,
                                        /* $useESI = */ false, /* $extraQuery = */ array(), /* $loadCall = */ $inHead
                                );
                                $defaultModules['user.groups'] = 'loading';
                        } else {
                                // Non-logged-in users have no user.groups module. Treat it as empty and 'ready' to
                                // avoid blocking gadgets that might depend upon the module.
                                $defaultModules['user.groups'] = 'ready';
                        }
                } else {
                        // Site (and group JS) disabled
                        $defaultModules['user.groups'] = 'missing';
                }

                $loaderInit = '';
                if ( $inHead ) {
                        // We generate loader calls anyway, so no need to fix the client-side loader's state to 'loading'.
                        foreach ( $defaultModules as $m => $state ) {
                                if ( $state == 'loading' ) {
                                        unset( $defaultModules[$m] );
                                }
                        }
                }
                if ( count( $defaultModules ) > 0 ) {
                        $loaderInit = Html::inlineScript(
                                ResourceLoader::makeLoaderConditionalScript(
                                        ResourceLoader::makeLoaderStateScript( $defaultModules )
                                )
                        ) . "\n";
                }
                return $loaderInit . $scripts;
        }

        function getBottomScripts() {
                global $wgResourceLoaderExperimentalAsyncLoading;
                if ( !$wgResourceLoaderExperimentalAsyncLoading ) {
                        return $this->getScriptsForBottomQueue( false );
                } else {
                        return '';
                }
        }

        public function addJsConfigVars( $keys, $value = null ) {
                if ( is_array( $keys ) ) {
                        foreach ( $keys as $key => $value ) {
                                $this->mJsConfigVars[$key] = $value;
                        }
                        return;
                }

                $this->mJsConfigVars[$keys] = $value;
        }

        public function getJSVars() {
                global $wgContLang;

                $latestRevID = 0;
                $pageID = 0;
                $canonicalName = false; # bug 21115

                $title = $this->getTitle();
                $ns = $title->getNamespace();
                $nsname = MWNamespace::exists( $ns ) ? MWNamespace::getCanonicalName( $ns ) : $title->getNsText();

                // Get the relevant title so that AJAX features can use the correct page name
                // when making API requests from certain special pages (bug 34972).
                $relevantTitle = $this->getSkin()->getRelevantTitle();

                if ( $ns == NS_SPECIAL ) {
                        list( $canonicalName, /*...*/ ) = SpecialPageFactory::resolveAlias( $title->getDBkey() );
                } elseif ( $this->canUseWikiPage() ) {
                        $wikiPage = $this->getWikiPage();
                        $latestRevID = $wikiPage->getLatest();
                        $pageID = $wikiPage->getId();
                }

                $lang = $title->getPageLanguage();

                // Pre-process information
                $separatorTransTable = $lang->separatorTransformTable();
                $separatorTransTable = $separatorTransTable ? $separatorTransTable : array();
                $compactSeparatorTransTable = array(
                        implode( "\t", array_keys( $separatorTransTable ) ),
                        implode( "\t", $separatorTransTable ),
                );
                $digitTransTable = $lang->digitTransformTable();
                $digitTransTable = $digitTransTable ? $digitTransTable : array();
                $compactDigitTransTable = array(
                        implode( "\t", array_keys( $digitTransTable ) ),
                        implode( "\t", $digitTransTable ),
                );

                $user = $this->getUser();

                $vars = array(
                        'wgCanonicalNamespace' => $nsname,
                        'wgCanonicalSpecialPageName' => $canonicalName,
                        'wgNamespaceNumber' => $title->getNamespace(),
                        'wgPageName' => $title->getPrefixedDBkey(),
                        'wgTitle' => $title->getText(),
                        'wgCurRevisionId' => $latestRevID,
                        'wgArticleId' => $pageID,
                        'wgIsArticle' => $this->isArticle(),
                        'wgAction' => Action::getActionName( $this->getContext() ),
                        'wgUserName' => $user->isAnon() ? null : $user->getName(),
                        'wgUserGroups' => $user->getEffectiveGroups(),
                        'wgCategories' => $this->getCategories(),
                        'wgBreakFrames' => $this->getFrameOptions() == 'DENY',
                        'wgPageContentLanguage' => $lang->getCode(),
                        'wgSeparatorTransformTable' => $compactSeparatorTransTable,
                        'wgDigitTransformTable' => $compactDigitTransTable,
                        'wgDefaultDateFormat' => $lang->getDefaultDateFormat(),
                        'wgMonthNames' => $lang->getMonthNamesArray(),
                        'wgMonthNamesShort' => $lang->getMonthAbbreviationsArray(),
                        'wgRelevantPageName' => $relevantTitle->getPrefixedDBkey(),
                );
                if ( $user->isLoggedIn() ) {
                        $vars['wgUserId'] = $user->getId();
                        $vars['wgUserEditCount'] = $user->getEditCount();
                        $userReg = wfTimestampOrNull( TS_UNIX, $user->getRegistration() );
                        $vars['wgUserRegistration'] = $userReg !== null ? ( $userReg * 1000 ) : null;
                }
                if ( $wgContLang->hasVariants() ) {
                        $vars['wgUserVariant'] = $wgContLang->getPreferredVariant();
                }
                foreach ( $title->getRestrictionTypes() as $type ) {
                        $vars['wgRestriction' . ucfirst( $type )] = $title->getRestrictions( $type );
                }
                if ( $title->isMainPage() ) {
                        $vars['wgIsMainPage'] = true;
                }
                if ( $this->mRedirectedFrom ) {
                        $vars['wgRedirectedFrom'] = $this->mRedirectedFrom->getPrefixedDBkey();
                }

                // Allow extensions to add their custom variables to the mw.config map.
                // Use the 'ResourceLoaderGetConfigVars' hook if the variable is not
                // page-dependant but site-wide (without state).
                // Alternatively, you may want to use OutputPage->addJsConfigVars() instead.
                wfRunHooks( 'MakeGlobalVariablesScript', array( &$vars, $this ) );

                // Merge in variables from addJsConfigVars last
                return array_merge( $vars, $this->mJsConfigVars );
        }

        public function userCanPreview() {
                if ( $this->getRequest()->getVal( 'action' ) != 'submit'
                        || !$this->getRequest()->wasPosted()
                        || !$this->getUser()->matchEditToken(
                                $this->getRequest()->getVal( 'wpEditToken' ) )
                ) {
                        return false;
                }
                if ( !$this->getTitle()->isJsSubpage() && !$this->getTitle()->isCssSubpage() ) {
                        return false;
                }

                return !count( $this->getTitle()->getUserPermissionsErrors( 'edit', $this->getUser() ) );
        }

        public function getHeadLinksArray( $addContentType = false ) {
                global $wgUniversalEditButton, $wgFavicon, $wgAppleTouchIcon, $wgEnableAPI,
                        $wgSitename, $wgVersion, $wgHtml5, $wgMimeType,
                        $wgFeed, $wgOverrideSiteFeed, $wgAdvertisedFeedTypes,
                        $wgDisableLangConversion, $wgCanonicalLanguageLinks,
                        $wgRightsPage, $wgRightsUrl;

                $tags = array();

                $canonicalUrl = $this->mCanonicalUrl;

                if ( $addContentType ) {
                        if ( $wgHtml5 ) {
                                # More succinct than <meta http-equiv=Content-Type>, has the
                                # same effect
                                $tags['meta-charset'] = Html::element( 'meta', array( 'charset' => 'UTF-8' ) );
                        } else {
                                $tags['meta-content-type'] = Html::element( 'meta', array(
                                        'http-equiv' => 'Content-Type',
                                        'content' => "$wgMimeType; charset=UTF-8"
                                ) );
                                $tags['meta-content-style-type'] = Html::element( 'meta', array( // bug 15835
                                        'http-equiv' => 'Content-Style-Type',
                                        'content' => 'text/css'
                                ) );
                        }
                }

                $tags['meta-generator'] = Html::element( 'meta', array(
                        'name' => 'generator',
                        'content' => "MediaWiki $wgVersion",
                ) );

                $p = "{$this->mIndexPolicy},{$this->mFollowPolicy}";
                if( $p !== 'index,follow' ) {
                        // http://www.robotstxt.org/wc/meta-user.html
                        // Only show if it's different from the default robots policy
                        $tags['meta-robots'] = Html::element( 'meta', array(
                                'name' => 'robots',
                                'content' => $p,
                        ) );
                }

                if ( count( $this->mKeywords ) > 0 ) {
                        $strip = array(
                                "/<.*?" . ">/" => '',
                                "/_/" => ' '
                        );
                        $tags['meta-keywords'] = Html::element( 'meta', array(
                                'name' => 'keywords',
                                'content' => preg_replace(
                                        array_keys( $strip ),
                                        array_values( $strip ),
                                        implode( ',', $this->mKeywords )
                                )
                        ) );
                }

                foreach ( $this->mMetatags as $tag ) {
                        if ( 0 == strcasecmp( 'http:', substr( $tag[0], 0, 5 ) ) ) {
                                $a = 'http-equiv';
                                $tag[0] = substr( $tag[0], 5 );
                        } else {
                                $a = 'name';
                        }
                        $tagName = "meta-{$tag[0]}";
                        if ( isset( $tags[$tagName] ) ) {
                                $tagName .= $tag[1];
                        }
                        $tags[$tagName] = Html::element( 'meta',
                                array(
                                        $a => $tag[0],
                                        'content' => $tag[1]
                                )
                        );
                }

                foreach ( $this->mLinktags as $tag ) {
                        $tags[] = Html::element( 'link', $tag );
                }

                # Universal edit button
                if ( $wgUniversalEditButton && $this->isArticleRelated() ) {
                        $user = $this->getUser();
                        if ( $this->getTitle()->quickUserCan( 'edit', $user )
                                && ( $this->getTitle()->exists() || $this->getTitle()->quickUserCan( 'create', $user ) ) ) {
                                // Original UniversalEditButton
                                $msg = $this->msg( 'edit' )->text();
                                $tags['universal-edit-button'] = Html::element( 'link', array(
                                        'rel' => 'alternate',
                                        'type' => 'application/x-wiki',
                                        'title' => $msg,
                                        'href' => $this->getTitle()->getLocalURL( 'action=edit' )
                                ) );
                                // Alternate edit link
                                $tags['alternative-edit'] = Html::element( 'link', array(
                                        'rel' => 'edit',
                                        'title' => $msg,
                                        'href' => $this->getTitle()->getLocalURL( 'action=edit' )
                                ) );
                        }
                }

                # Generally the order of the favicon and apple-touch-icon links
                # should not matter, but Konqueror (3.5.9 at least) incorrectly
                # uses whichever one appears later in the HTML source. Make sure
                # apple-touch-icon is specified first to avoid this.
                if ( $wgAppleTouchIcon !== false ) {
                        $tags['apple-touch-icon'] = Html::element( 'link', array( 'rel' => 'apple-touch-icon', 'href' => $wgAppleTouchIcon ) );
                }

                if ( $wgFavicon !== false ) {
                        $tags['favicon'] = Html::element( 'link', array( 'rel' => 'shortcut icon', 'href' => $wgFavicon ) );
                }

                # OpenSearch description link
                $tags['opensearch'] = Html::element( 'link', array(
                        'rel' => 'search',
                        'type' => 'application/opensearchdescription+xml',
                        'href' => wfScript( 'opensearch_desc' ),
                        'title' => $this->msg( 'opensearch-desc' )->inContentLanguage()->text(),
                ) );

                if ( $wgEnableAPI ) {
                        # Real Simple Discovery link, provides auto-discovery information
                        # for the MediaWiki API (and potentially additional custom API
                        # support such as WordPress or Twitter-compatible APIs for a
                        # blogging extension, etc)
                        $tags['rsd'] = Html::element( 'link', array(
                                'rel' => 'EditURI',
                                'type' => 'application/rsd+xml',
                                // Output a protocol-relative URL here if $wgServer is protocol-relative
                                // Whether RSD accepts relative or protocol-relative URLs is completely undocumented, though
                                'href' => wfExpandUrl( wfAppendQuery( wfScript( 'api' ), array( 'action' => 'rsd' ) ), PROTO_RELATIVE ),
                        ) );
                }

                # Language variants
                if ( !$wgDisableLangConversion && $wgCanonicalLanguageLinks ) {
                        $lang = $this->getTitle()->getPageLanguage();
                        if ( $lang->hasVariants() ) {

                                $urlvar = $lang->getURLVariant();

                                if ( !$urlvar ) {
                                        $variants = $lang->getVariants();
                                        foreach ( $variants as $_v ) {
                                                $tags["variant-$_v"] = Html::element( 'link', array(
                                                        'rel' => 'alternate',
                                                        'hreflang' => $_v,
                                                        'href' => $this->getTitle()->getLocalURL( array( 'variant' => $_v ) ) )
                                                );
                                        }
                                } else {
                                        $canonicalUrl = $this->getTitle()->getLocalURL();
                                }
                        }
                }

                # Copyright
                $copyright = '';
                if ( $wgRightsPage ) {
                        $copy = Title::newFromText( $wgRightsPage );

                        if ( $copy ) {
                                $copyright = $copy->getLocalURL();
                        }
                }

                if ( !$copyright && $wgRightsUrl ) {
                        $copyright = $wgRightsUrl;
                }

                if ( $copyright ) {
                        $tags['copyright'] = Html::element( 'link', array(
                                'rel' => 'copyright',
                                'href' => $copyright )
                        );
                }

                # Feeds
                if ( $wgFeed ) {
                        foreach( $this->getSyndicationLinks() as $format => $link ) {
                                # Use the page name for the title.  In principle, this could
                                # lead to issues with having the same name for different feeds
                                # corresponding to the same page, but we can't avoid that at
                                # this low a level.

                                $tags[] = $this->feedLink(
                                        $format,
                                        $link,
                                        # Used messages: 'page-rss-feed' and 'page-atom-feed' (for an easier grep)
                                        $this->msg( "page-{$format}-feed", $this->getTitle()->getPrefixedText() )->text()
                                );
                        }

                        # Recent changes feed should appear on every page (except recentchanges,
                        # that would be redundant). Put it after the per-page feed to avoid
                        # changing existing behavior. It's still available, probably via a
                        # menu in your browser. Some sites might have a different feed they'd
                        # like to promote instead of the RC feed (maybe like a "Recent New Articles"
                        # or "Breaking news" one). For this, we see if $wgOverrideSiteFeed is defined.
                        # If so, use it instead.
                        if ( $wgOverrideSiteFeed ) {
                                foreach ( $wgOverrideSiteFeed as $type => $feedUrl ) {
                                        // Note, this->feedLink escapes the url.
                                        $tags[] = $this->feedLink(
                                                $type,
                                                $feedUrl,
                                                $this->msg( "site-{$type}-feed", $wgSitename )->text()
                                        );
                                }
                        } elseif ( !$this->getTitle()->isSpecial( 'Recentchanges' ) ) {
                                $rctitle = SpecialPage::getTitleFor( 'Recentchanges' );
                                foreach ( $wgAdvertisedFeedTypes as $format ) {
                                        $tags[] = $this->feedLink(
                                                $format,
                                                $rctitle->getLocalURL( "feed={$format}" ),
                                                $this->msg( "site-{$format}-feed", $wgSitename )->text() # For grep: 'site-rss-feed', 'site-atom-feed'.
                                        );
                                }
                        }
                }

                # Canonical URL
                global $wgEnableCanonicalServerLink;
                if ( $wgEnableCanonicalServerLink ) {
                        if ( $canonicalUrl !== false ) {
                                $canonicalUrl = wfExpandUrl( $canonicalUrl, PROTO_CANONICAL );
                        } else {
                                $reqUrl = $this->getRequest()->getRequestURL();
                                $canonicalUrl = wfExpandUrl( $reqUrl, PROTO_CANONICAL );
                        }
                }
                if ( $canonicalUrl !== false ) {
                        $tags[] = Html::element( 'link', array(
                                'rel' => 'canonical',
                                'href' => $canonicalUrl
                        ) );
                }

                return $tags;
        }

        public function getHeadLinks( $unused = null, $addContentType = false ) {
                return implode( "\n", $this->getHeadLinksArray( $addContentType ) );
        }

        private function feedLink( $type, $url, $text ) {
                return Html::element( 'link', array(
                        'rel' => 'alternate',
                        'type' => "application/$type+xml",
                        'title' => $text,
                        'href' => $url )
                );
        }

        public function addStyle( $style, $media = '', $condition = '', $dir = '' ) {
                $options = array();
                // Even though we expect the media type to be lowercase, but here we
                // force it to lowercase to be safe.
                if( $media ) {
                        $options['media'] = $media;
                }
                if( $condition ) {
                        $options['condition'] = $condition;
                }
                if( $dir ) {
                        $options['dir'] = $dir;
                }
                $this->styles[$style] = $options;
        }

        public function addInlineStyle( $style_css, $flip = 'noflip' ) {
                if( $flip === 'flip' && $this->getLanguage()->isRTL() ) {
                        # If wanted, and the interface is right-to-left, flip the CSS
                        $style_css = CSSJanus::transform( $style_css, true, false );
                }
                $this->mInlineStyles .= Html::inlineStyle( $style_css );
        }

        public function buildCssLinks() {
                global $wgUseSiteCss, $wgAllowUserCss, $wgAllowUserCssPrefs, $wgContLang;

                $this->getSkin()->setupSkinUserCss( $this );

                // Add ResourceLoader styles
                // Split the styles into four groups
                $styles = array( 'other' => array(), 'user' => array(), 'site' => array(), 'private' => array(), 'noscript' => array() );
                $otherTags = ''; // Tags to append after the normal <link> tags
                $resourceLoader = $this->getResourceLoader();

                $moduleStyles = $this->getModuleStyles();

                // Per-site custom styles
                if ( $wgUseSiteCss ) {
                        $moduleStyles[] = 'site';
                        $moduleStyles[] = 'noscript';
                        if( $this->getUser()->isLoggedIn() ) {
                                $moduleStyles[] = 'user.groups';
                        }
                }

                // Per-user custom styles
                if ( $wgAllowUserCss ) {
                        if ( $this->getTitle()->isCssSubpage() && $this->userCanPreview() ) {
                                // We're on a preview of a CSS subpage
                                // Exclude this page from the user module in case it's in there (bug 26283)
                                $otherTags .= $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_STYLES, false,
                                        array( 'excludepage' => $this->getTitle()->getPrefixedDBkey() )
                                );

                                // Load the previewed CSS
                                // If needed, Janus it first. This is user-supplied CSS, so it's
                                // assumed to be right for the content language directionality.
                                $previewedCSS = $this->getRequest()->getText( 'wpTextbox1' );
                                if ( $this->getLanguage()->getDir() !== $wgContLang->getDir() ) {
                                        $previewedCSS = CSSJanus::transform( $previewedCSS, true, false );
                                }
                                $otherTags .= Html::inlineStyle( $previewedCSS );
                        } else {
                                // Load the user styles normally
                                $moduleStyles[] = 'user';
                        }
                }

                // Per-user preference styles
                if ( $wgAllowUserCssPrefs ) {
                        $moduleStyles[] = 'user.cssprefs';
                }

                foreach ( $moduleStyles as $name ) {
                        $module = $resourceLoader->getModule( $name );
                        if ( !$module ) {
                                continue;
                        }
                        $group = $module->getGroup();
                        // Modules in groups named "other" or anything different than "user", "site" or "private"
                        // will be placed in the "other" group
                        $styles[isset( $styles[$group] ) ? $group : 'other'][] = $name;
                }

                // We want site, private and user styles to override dynamically added styles from modules, but we want
                // dynamically added styles to override statically added styles from other modules. So the order
                // has to be other, dynamic, site, private, user
                // Add statically added styles for other modules
                $ret = $this->makeResourceLoaderLink( $styles['other'], ResourceLoaderModule::TYPE_STYLES );
                // Add normal styles added through addStyle()/addInlineStyle() here
                $ret .= implode( "\n", $this->buildCssLinksArray() ) . $this->mInlineStyles;
                // Add marker tag to mark the place where the client-side loader should inject dynamic styles
                // We use a <meta> tag with a made-up name for this because that's valid HTML
                $ret .= Html::element( 'meta', array( 'name' => 'ResourceLoaderDynamicStyles', 'content' => '' ) ) . "\n";

                // Add site, private and user styles
                // 'private' at present only contains user.options, so put that before 'user'
                // Any future private modules will likely have a similar user-specific character
                foreach ( array( 'site', 'noscript', 'private', 'user' ) as $group ) {
                        $ret .= $this->makeResourceLoaderLink( $styles[$group],
                                        ResourceLoaderModule::TYPE_STYLES
                        );
                }

                // Add stuff in $otherTags (previewed user CSS if applicable)
                $ret .= $otherTags;
                return $ret;
        }

        public function buildCssLinksArray() {
                $links = array();

                // Add any extension CSS
                foreach ( $this->mExtStyles as $url ) {
                        $this->addStyle( $url );
                }
                $this->mExtStyles = array();

                foreach( $this->styles as $file => $options ) {
                        $link = $this->styleLink( $file, $options );
                        if( $link ) {
                                $links[$file] = $link;
                        }
                }
                return $links;
        }

        protected function styleLink( $style, $options ) {
                if( isset( $options['dir'] ) ) {
                        if( $this->getLanguage()->getDir() != $options['dir'] ) {
                                return '';
                        }
                }

                if( isset( $options['media'] ) ) {
                        $media = self::transformCssMedia( $options['media'] );
                        if( is_null( $media ) ) {
                                return '';
                        }
                } else {
                        $media = 'all';
                }

                if( substr( $style, 0, 1 ) == '/' ||
                        substr( $style, 0, 5 ) == 'http:' ||
                        substr( $style, 0, 6 ) == 'https:' ) {
                        $url = $style;
                } else {
                        global $wgStylePath, $wgStyleVersion;
                        $url = $wgStylePath . '/' . $style . '?' . $wgStyleVersion;
                }

                $link = Html::linkedStyle( $url, $media );

                if( isset( $options['condition'] ) ) {
                        $condition = htmlspecialchars( $options['condition'] );
                        $link = "<!--[if $condition]>$link<![endif]-->";
                }
                return $link;
        }

        public static function transformCssMedia( $media ) {
                global $wgRequest, $wgHandheldForIPhone;

                // http://www.w3.org/TR/css3-mediaqueries/#syntax
                $screenMediaQueryRegex = '/^(?:only\s+)?screen\b/i';

                // Switch in on-screen display for media testing
                $switches = array(
                        'printable' => 'print',
                        'handheld' => 'handheld',
                );
                foreach( $switches as $switch => $targetMedia ) {
                        if( $wgRequest->getBool( $switch ) ) {
                                if( $media == $targetMedia ) {
                                        $media = '';
                                } elseif( preg_match( $screenMediaQueryRegex, $media ) === 1 ) {
                                        // This regex will not attempt to understand a comma-separated media_query_list
                                        //
                                        // Example supported values for $media: 'screen', 'only screen', 'screen and (min-width: 982px)' ),
                                        // Example NOT supported value for $media: '3d-glasses, screen, print and resolution > 90dpi'
                                        //
                                        // If it's a print request, we never want any kind of screen stylesheets
                                        // If it's a handheld request (currently the only other choice with a switch),
                                        // we don't want simple 'screen' but we might want screen queries that
                                        // have a max-width or something, so we'll pass all others on and let the
                                        // client do the query.
                                        if( $targetMedia == 'print' || $media == 'screen' ) {
                                                return null;
                                        }
                                }
                        }
                }

                // Expand longer media queries as iPhone doesn't grok 'handheld'
                if( $wgHandheldForIPhone ) {
                        $mediaAliases = array(
                                'screen' => 'screen and (min-device-width: 481px)',
                                'handheld' => 'handheld, only screen and (max-device-width: 480px)',
                        );

                        if( isset( $mediaAliases[$media] ) ) {
                                $media = $mediaAliases[$media];
                        }
                }

                return $media;
        }

        public function addWikiMsg( /*...*/ ) {
                $args = func_get_args();
                $name = array_shift( $args );
                $this->addWikiMsgArray( $name, $args );
        }

        public function addWikiMsgArray( $name, $args ) {
                $this->addHTML( $this->msg( $name, $args )->parseAsBlock() );
        }

        public function wrapWikiMsg( $wrap /*, ...*/ ) {
                $msgSpecs = func_get_args();
                array_shift( $msgSpecs );
                $msgSpecs = array_values( $msgSpecs );
                $s = $wrap;
                foreach ( $msgSpecs as $n => $spec ) {
                        if ( is_array( $spec ) ) {
                                $args = $spec;
                                $name = array_shift( $args );
                                if ( isset( $args['options'] ) ) {
                                        unset( $args['options'] );
                                        wfDeprecated(
                                                'Adding "options" to ' . __METHOD__ . ' is no longer supported',
                                                '1.20'
                                        );
                                }
                        } else {
                                $args = array();
                                $name = $spec;
                        }
                        $s = str_replace( '$' . ( $n + 1 ), $this->msg( $name, $args )->plain(), $s );
                }
                $this->addWikiText( $s );
        }

        public function includeJQuery( $modules = array() ) {
                return array();
        }

}