OutputPage.php

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<?php
# See design.doc

if($wgUseTeX) require_once( "Math.php" );

class OutputPage {
        var $mHeaders, $mCookies, $mMetatags, $mKeywords;
        var $mLinktags, $mPagetitle, $mBodytext, $mDebugtext;
        var $mHTMLtitle, $mRobotpolicy, $mIsarticle, $mPrintable;
        var $mSubtitle, $mRedirect;
        var $mLastModified, $mCategoryLinks;
        var $mScripts;

        var $mSuppressQuickbar;
        var $mOnloadHandler;
        var $mDoNothing;
        var $mContainsOldMagic, $mContainsNewMagic; 
        var $mIsArticleRelated;
        var $mParserOptions;
        var $mShowFeedLinks = false;
        var $mEnableClientCache = true;
        
        function OutputPage()
        {
                $this->mHeaders = $this->mCookies = $this->mMetatags =
                $this->mKeywords = $this->mLinktags = array();
                $this->mHTMLtitle = $this->mPagetitle = $this->mBodytext =
                $this->mRedirect = $this->mLastModified =
                $this->mSubtitle = $this->mDebugtext = $this->mRobotpolicy = 
                $this->mOnloadHandler = "";
                $this->mIsArticleRelated = $this->mIsarticle = $this->mPrintable = true;
                $this->mSuppressQuickbar = $this->mPrintable = false;
                $this->mLanguageLinks = array();
                $this->mCategoryLinks = array() ;
                $this->mDoNothing = false;
                $this->mContainsOldMagic = $this->mContainsNewMagic = 0;
                $this->mParserOptions = ParserOptions::newFromUser( $temp = NULL );
                $this->mSquidMaxage = 0;
                $this->mScripts = "";
        }

        function addHeader( $name, $val ) { array_push( $this->mHeaders, "$name: $val" ) ; }
        function addCookie( $name, $val ) { array_push( $this->mCookies, array( $name, $val ) ); }
        function redirect( $url, $responsecode = '302' ) { $this->mRedirect = $url; $this->mRedirectCode = $responsecode; }

        # To add an http-equiv meta tag, precede the name with "http:"
        function addMeta( $name, $val ) { array_push( $this->mMetatags, array( $name, $val ) ); }
        function addKeyword( $text ) { array_push( $this->mKeywords, $text ); }
        function addScript( $script ) { $this->mScripts .= $script; }
        function getScript() { return $this->mScripts; }
        
        function addLink( $linkarr ) {
                # $linkarr should be an associative array of attributes. We'll escape on output.
                array_push( $this->mLinktags, $linkarr );
        }

        function addMetadataLink( $linkarr ) {
                # note: buggy CC software only reads first "meta" link
                static $haveMeta = false;
                $linkarr["rel"] = ($haveMeta) ? "alternate meta" : "meta";
                $this->addLink( $linkarr );
                $haveMeta = true;
        }

        # checkLastModified tells the client to use the client-cached page if
        # possible. If sucessful, the OutputPage is disabled so that
        # any future call to OutputPage->output() have no effect. The method
        # returns true iff cache-ok headers was sent. 
        function checkLastModified ( $timestamp )
        {
                global $wgLang, $wgCachePages, $wgUser;
                if( !$wgCachePages ) {
                        wfDebug( "CACHE DISABLED\n", false );
                        return;
                }
                if( preg_match( '/MSIE ([1-4]|5\.0)/', $_SERVER["HTTP_USER_AGENT"] ) ) {
                        # IE 5.0 has probs with our caching
                        wfDebug( "-- bad client, not caching\n", false );
                        return;
                }
                if( $wgUser->getOption( "nocache" ) ) {
                        wfDebug( "USER DISABLED CACHE\n", false );
                        return;
                }

                $lastmod = gmdate( "D, j M Y H:i:s", wfTimestamp2Unix( max( $timestamp, $wgUser->mTouched ) ) ) . " GMT";

                if( !empty( $_SERVER["HTTP_IF_MODIFIED_SINCE"] ) ) {
                        # IE sends sizes after the date like this:
                        # Wed, 20 Aug 2003 06:51:19 GMT; length=5202
                        # this breaks strtotime().
                        $modsince = preg_replace( '/;.*$/', '', $_SERVER["HTTP_IF_MODIFIED_SINCE"] );
                        $ismodsince = wfUnix2Timestamp( strtotime( $modsince ) );
                        wfDebug( "-- client send If-Modified-Since: " . $modsince . "\n", false );
                        wfDebug( "--  we might send Last-Modified : $lastmod\n", false ); 

                        if( ($ismodsince >= $timestamp ) and $wgUser->validateCache( $ismodsince ) ) {
                                # Make sure you're in a place you can leave when you call us!
                                header( "HTTP/1.0 304 Not Modified" );
                                $this->mLastModified = $lastmod;
                                $this->sendCacheControl();
                                wfDebug( "CACHED client: $ismodsince ; user: $wgUser->mTouched ; page: $timestamp\n", false );
                                $this->disable();
                                return true;
                        } else {
                                wfDebug( "READY  client: $ismodsince ; user: $wgUser->mTouched ; page: $timestamp\n", false );
                                $this->mLastModified = $lastmod;
                        }
                } else {
                        wfDebug( "We're confused.\n", false );
                        $this->mLastModified = $lastmod;
                }
        }

        function getPageTitleActionText () {
                global $action;
                switch($action) {
                        case 'edit':
                                return  wfMsg('edit');
                        case 'history':
                                return wfMsg('history_short');
                        case 'protect':
                                return wfMsg('unprotect');
                        case 'unprotect':
                                return wfMsg('unprotect');
                        case 'delete':
                                return wfMsg('delete');
                        case 'watch':
                                return wfMsg('watch');
                        case 'unwatch':
                                return wfMsg('unwatch');
                        case 'submit':
                                return wfMsg('preview');
                        default:
                                return '';
                }
        }
        function setRobotpolicy( $str ) { $this->mRobotpolicy = $str; }
        function setHTMLTitle( $name ) {$this->mHTMLtitle = $name; }
        function setPageTitle( $name ) {
                global $action;
                $this->mPagetitle = $name;
                if(!empty($action)) {
                        $taction =  $this->getPageTitleActionText();
                        if( !empty( $taction ) ) {
                                $name .= " - $taction";
                        }
                }
                $this->setHTMLTitle( $name . " - " . wfMsg( "wikititlesuffix" ) );
        }
        function getHTMLTitle() { return $this->mHTMLtitle; }
        function getPageTitle() { return $this->mPagetitle; }
        function setSubtitle( $str ) { $this->mSubtitle = $str; }
        function getSubtitle() { return $this->mSubtitle; }
        function isArticle() { return $this->mIsarticle; }
        function setPrintable() { $this->mPrintable = true; }
        function isPrintable() { return $this->mPrintable; }
        function setSyndicated( $show = true ) { $this->mShowFeedLinks = $show; }
        function isSyndicated() { return $this->mShowFeedLinks; }
        function setOnloadHandler( $js ) { $this->mOnloadHandler = $js; }
        function getOnloadHandler() { return $this->mOnloadHandler; }
        function disable() { $this->mDoNothing = true; }

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

        function isArticleRelated()
        {
                return $this->mIsArticleRelated;
        }
        
        function getLanguageLinks() {
                return $this->mLanguageLinks;
        }
        function addLanguageLinks($newLinkArray) {
                $this->mLanguageLinks += $newLinkArray;
        }
        function setLanguageLinks($newLinkArray) {
                $this->mLanguageLinks = $newLinkArray;
        }
        function getCategoryLinks() {
                return $this->mCategoryLinks;
        } 
        function addCategoryLinks($newLinkArray) {
                $this->mCategoryLinks += $newLinkArray;
        }
        function setCategoryLinks($newLinkArray) {
                $this->mCategoryLinks += $newLinkArray;
        }

        function suppressQuickbar() { $this->mSuppressQuickbar = true; }
        function isQuickbarSuppressed() { return $this->mSuppressQuickbar; }

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

        function setParserOptions( $options )
        {
                return wfSetVar( $this->mParserOptions, $options );
        }

        # First pass--just handle <nowiki> sections, pass the rest off
        # to doWikiPass2() which does all the real work.
        #
        # $cacheArticle - assume this text is the main text for the given article
        #
        function addWikiText( $text, $linestart = true, $cacheArticle = NULL )
        {
                global $wgParser, $wgParserCache, $wgUser, $wgTitle;
                
                $parserOutput = $wgParser->parse( $text, $wgTitle, $this->mParserOptions, $linestart );
                if ( $cacheArticle ) {
                        $wgParserCache->save( $parserOutput, $cacheArticle, $wgUser );
                }
                
                $this->mLanguageLinks += $parserOutput->getLanguageLinks();
                $this->mCategoryLinks += $parserOutput->getCategoryLinks();
                $this->addHTML( $parserOutput->getText() );
        }

        function tryParserCache( $article, $user ) {
                global $wgParserCache;
                $parserOutput = $wgParserCache->get( $article, $user );
                if ( $parserOutput !== false ) {
                        $this->mLanguageLinks += $parserOutput->getLanguageLinks();
                        $this->mCategoryLinks += $parserOutput->getCategoryLinks();
                        $this->addHTML( $parserOutput->getText() );
                        return true;
                } else {
                        return false;
                }
        }
        
        # Set the maximum cache time on the Squid in seconds
        function setSquidMaxage( $maxage ) {
                $this->mSquidMaxage = $maxage;
        }
        
        # Use enableClientCache(false) to force it to send nocache headers
        function enableClientCache( $state ) {
                return wfSetVar( $this->mEnableClientCache, $state );
        }
        
        function sendCacheControl() {
                global $wgUseSquid, $wgUseESI;
                # FIXME: This header may cause trouble with some versions of Internet Explorer
                header( "Vary: Accept-Encoding, Cookie" );
                if( $this->mEnableClientCache ) {
                        if( $wgUseSquid && ! isset( $_COOKIE[ini_get( "session.name") ] ) && 
                          ! $this->isPrintable() && $this->mSquidMaxage != 0 ) 
                        {
                                if ( $wgUseESI ) {
                                        # We'll purge the proxy cache explicitly, but require end user agents
                                        # to revalidate against the proxy on each visit.
                                        # Surrogate-Control controls our Squid, Cache-Control downstream caches
                                        wfDebug( "** proxy caching with ESI; {$this->mLastModified} **\n", false );
                                        # start with a shorter timeout for initial testing
                                        # header( 'Surrogate-Control: max-age=2678400+2678400, content="ESI/1.0"');
                                        header( 'Surrogate-Control: max-age='.$wgSquidMaxage.'+'.$this->mSquidMaxage.', content="ESI/1.0"');
                                        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( "** local proxy caching; {$this->mLastModified} **\n", false );
                                        # start with a shorter timeout for initial testing
                                        # header( "Cache-Control: s-maxage=2678400, must-revalidate, max-age=0" );
                                        header( 'Cache-Control: s-maxage='.$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( "** private caching; {$this->mLastModified} **\n", false );
                                header( "Expires: -1" );
                                header( "Cache-Control: private, must-revalidate, max-age=0" );
                        }
                        if($this->mLastModified) header( "Last-modified: {$this->mLastModified}" );
                } else {
                        wfDebug( "** 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.
                        header( "Expires: -1" );
                        header( "Cache-Control: no-cache, no-store, max-age=0, must-revalidate" );
                        header( "Pragma: no-cache" );
                }
        }
        
        # Finally, all the text has been munged and accumulated into
        # the object, let's actually output it:
        #
        function output()
        {
                global $wgUser, $wgLang, $wgDebugComments, $wgCookieExpiration;
                global $wgInputEncoding, $wgOutputEncoding, $wgLanguageCode;
                global $wgDebugRedirects, $wgMimeType;
                if( $this->mDoNothing ){
                        return;
                }
                $fname = "OutputPage::output";
                wfProfileIn( $fname );
                
                $sk = $wgUser->getSkin();

                if ( "" != $this->mRedirect ) {
                        if( substr( $this->mRedirect, 0, 4 ) != "http" ) {
                                # Standards require redirect URLs to be absolute
                                global $wgServer;
                                $this->mRedirect = $wgServer . $this->mRedirect;
                        }
                        if( $this->mRedirectCode == '301') {
                                if( !$wgDebugRedirects ) {
                                        header("HTTP/1.1 {$this->mRedirectCode} Moved Permanently");
                                }
                                $this->mLastModified = gmdate( "D, j M Y H:i:s" ) . " GMT";
                        }
                        
                        $this->sendCacheControl();
                        
                        if( $wgDebugRedirects ) {
                                $url = htmlspecialchars( $this->mRedirect );
                                print "<html>\n<head>\n<title>Redirect</title>\n</head>\n<body>\n";
                                print "<p>Location: <a href=\"$url\">$url</a></p>\n";
                                print "</body>\n</html>\n";
                        } else {
                                header( "Location: {$this->mRedirect}" );
                        }
                        return;
                }
                
                
                $this->sendCacheControl();
                
                header( "Content-type: $wgMimeType; charset={$wgOutputEncoding}" );
                header( "Content-language: {$wgLanguageCode}" );

                $exp = time() + $wgCookieExpiration;
                foreach( $this->mCookies as $name => $val ) {
                        setcookie( $name, $val, $exp, "/" );
                }
                
                $sk->outputPage( $this );
                # flush();
        }

        function out( $ins )
        {
                global $wgInputEncoding, $wgOutputEncoding, $wgLang;
                if ( 0 == strcmp( $wgInputEncoding, $wgOutputEncoding ) ) {
                        $outs = $ins;
                } else {
                        $outs = $wgLang->iconv( $wgInputEncoding, $wgOutputEncoding, $ins );
                        if ( false === $outs ) { $outs = $ins; }
                }
                print $outs;
        }

        function setEncodings()
        {
                global $wgInputEncoding, $wgOutputEncoding;
                global $wgUser, $wgLang;

                $wgInputEncoding = strtolower( $wgInputEncoding );
                
                if( $wgUser->getOption( 'altencoding' ) ) {
                        $wgLang->setAltEncoding();
                        return;
                }

                if ( empty( $_SERVER['HTTP_ACCEPT_CHARSET'] ) ) {
                        $wgOutputEncoding = strtolower( $wgOutputEncoding );
                        return;
                }
                
                /*
                # This code is unused anyway!
                # Commenting out. --bv 2003-11-15
                
                $a = explode( ",", $_SERVER['HTTP_ACCEPT_CHARSET'] );
                $best = 0.0;
                $bestset = "*";

                foreach ( $a as $s ) {
                        if ( preg_match( "/(.*);q=(.*)/", $s, $m ) ) {
                                $set = $m[1];
                                $q = (float)($m[2]);
                        } else {
                                $set = $s;
                                $q = 1.0;
                        }
                        if ( $q > $best ) {
                                $bestset = $set;
                                $best = $q;
                        }
                }
                #if ( "*" == $bestset ) { $bestset = "iso-8859-1"; }
                if ( "*" == $bestset ) { $bestset = $wgOutputEncoding; }
                $wgOutputEncoding = strtolower( $bestset );

# Disable for now
#
                */
                $wgOutputEncoding = $wgInputEncoding;
        }

        # Returns a HTML comment with the elapsed time since request. 
        # This method has no side effects.
        function reportTime()
        {
                global $wgRequestTime;

                $now = wfTime();
                list( $usec, $sec ) = explode( " ", $wgRequestTime );
                $start = (float)$sec + (float)$usec;
                $elapsed = $now - $start;
                
                # Use real server name if available, so we know which machine
                # in a server farm generated the current page.
                if ( function_exists( "posix_uname" ) ) {
                        $uname = @posix_uname();
                } else {
                        $uname = false;
                }
                if( is_array( $uname ) && isset( $uname['nodename'] ) ) {
                        $hostname = $uname['nodename'];
                } else {
                        # This may be a virtual server.
                        $hostname = $_SERVER['SERVER_NAME'];
                }
                $com = sprintf( "<!-- Served by %s in %01.2f secs. -->",
                  $hostname, $elapsed );
                return $com;
        }

        # Note: these arguments are keys into wfMsg(), not text!
        #
        function errorpage( $title, $msg )
        {
                global $wgTitle;

                $this->mDebugtext .= "Original title: " .
                  $wgTitle->getPrefixedText() . "\n";
                $this->setPageTitle( wfMsg( $title ) );
                $this->setHTMLTitle( wfMsg( "errorpagetitle" ) );
                $this->setRobotpolicy( "noindex,nofollow" );
                $this->setArticleRelated( false );
                $this->enableClientCache( false );

                $this->mBodytext = "";
                $this->addHTML( "<p>" . wfMsg( $msg ) . "</p>\n" );
                $this->returnToMain( false );

                $this->output();
                wfAbruptExit();
        }

        function sysopRequired()
        {
                global $wgUser;

                $this->setPageTitle( wfMsg( "sysoptitle" ) );
                $this->setHTMLTitle( wfMsg( "errorpagetitle" ) );
                $this->setRobotpolicy( "noindex,nofollow" );
                $this->setArticleRelated( false );
                $this->mBodytext = "";

                $sk = $wgUser->getSkin();
                $ap = $sk->makeKnownLink( wfMsg( "administrators" ), "" );      
                $this->addHTML( wfMsg( "sysoptext", $ap ) );
                $this->returnToMain();
        }

        function developerRequired()
        {
                global $wgUser;

                $this->setPageTitle( wfMsg( "developertitle" ) );
                $this->setHTMLTitle( wfMsg( "errorpagetitle" ) );
                $this->setRobotpolicy( "noindex,nofollow" );
                $this->setArticleRelated( false );
                $this->mBodytext = "";

                $sk = $wgUser->getSkin();
                $ap = $sk->makeKnownLink( wfMsg( "administrators" ), "" );      
                $this->addHTML( wfMsg( "developertext", $ap ) );
                $this->returnToMain();
        }

        function loginToUse()
        {
                global $wgUser, $wgTitle, $wgLang;

                $this->setPageTitle( wfMsg( "loginreqtitle" ) );
                $this->setHTMLTitle( wfMsg( "errorpagetitle" ) );
                $this->setRobotpolicy( "noindex,nofollow" );
                $this->setArticleFlag( false );
                $this->mBodytext = "";
                $this->addWikiText( wfMsg( "loginreqtext" ) );

                # We put a comment in the .html file so a Sysop can diagnose the page the
                # user can't see.
                $this->addHTML( "\n<!--" . 
                                                $wgLang->getNsText( $wgTitle->getNamespace() ) . 
                                                ":" . 
                                                $wgTitle->getDBkey() . "-->" );
                $this->returnToMain();          # Flip back to the main page after 10 seconds.
        }

        function databaseError( $fname, $sql, $error, $errno )
        {
                global $wgUser, $wgCommandLineMode;

                $this->setPageTitle( wfMsgNoDB( "databaseerror" ) );
                $this->setRobotpolicy( "noindex,nofollow" );
                $this->setArticleRelated( false );
                $this->enableClientCache( false );

                if ( $wgCommandLineMode ) {
                        $msg = wfMsgNoDB( "dberrortextcl" );
                } else {
                        $msg = wfMsgNoDB( "dberrortext" );
                }

                $msg = str_replace( "$1", htmlspecialchars( $sql ), $msg );
                $msg = str_replace( "$2", htmlspecialchars( $fname ), $msg );
                $msg = str_replace( "$3", $errno, $msg );
                $msg = str_replace( "$4", htmlspecialchars( $error ), $msg );
                
                if ( $wgCommandLineMode || !is_object( $wgUser )) {
                        print "$msg\n";
                        wfAbruptExit();
                }
                $sk = $wgUser->getSkin();
                $shlink = $sk->makeKnownLink( wfMsgNoDB( "searchhelppage" ),
                  wfMsgNoDB( "searchingwikipedia" ) );
                $msg = str_replace( "$5", $shlink, $msg );
                $this->mBodytext = $msg;
                $this->output();
                wfAbruptExit();
        }

        function readOnlyPage( $source = null, $protected = false )
        {
                global $wgUser, $wgReadOnlyFile;

                $this->setRobotpolicy( "noindex,nofollow" );
                $this->setArticleRelated( false );

                if( $protected ) {
                        $this->setPageTitle( wfMsg( "viewsource" ) );
                        $this->addWikiText( wfMsg( "protectedtext" ) );
                } else {
                        $this->setPageTitle( wfMsg( "readonly" ) );
                        $reason = file_get_contents( $wgReadOnlyFile );
                        $this->addWikiText( wfMsg( "readonlytext", $reason ) );
                }
                
                if( is_string( $source ) ) {
                        if( strcmp( $source, "" ) == 0 ) {
                                $source = wfMsg( "noarticletext" );
                        }
                        $rows = $wgUser->getOption( "rows" );
                        $cols = $wgUser->getOption( "cols" );
                        $text = "\n<textarea cols='$cols' rows='$rows' readonly='readonly'>" .
                                htmlspecialchars( $source ) . "\n</textarea>";
                        $this->addHTML( $text );
                }
                
                $this->returnToMain( false );
        }

        function fatalError( $message )
        {
                $this->setPageTitle( wfMsg( "internalerror" ) );
                $this->setRobotpolicy( "noindex,nofollow" );
                $this->setArticleRelated( false );
                $this->enableClientCache( false );

                $this->mBodytext = $message;
                $this->output();
                wfAbruptExit();
        }

        function unexpectedValueError( $name, $val )
        {
                $this->fatalError( wfMsg( "unexpected", $name, $val ) );
        }

        function fileCopyError( $old, $new )
        {
                $this->fatalError( wfMsg( "filecopyerror", $old, $new ) );
        }

        function fileRenameError( $old, $new )
        {
                $this->fatalError( wfMsg( "filerenameerror", $old, $new ) );
        }

        function fileDeleteError( $name )
        {
                $this->fatalError( wfMsg( "filedeleteerror", $name ) );
        }

        function fileNotFoundError( $name )
        {
                $this->fatalError( wfMsg( "filenotfound", $name ) );
        }

        // return from error messages or notes
        //   auto:      automatically redirect the user after 10 seconds
        //   returnto:  page title to return to. Default is Main Page.
        function returnToMain( $auto = true, $returnto = NULL )
        {
                global $wgUser, $wgOut, $wgRequest;
                
                if ( $returnto == NULL ) {
                        $returnto = $wgRequest->getText( 'returnto' );
                }

                $sk = $wgUser->getSkin();
                if ( "" == $returnto ) {
                        $returnto = wfMsg( "mainpage" );
                }
                $link = $sk->makeKnownLink( $returnto, "" );

                $r = wfMsg( "returnto", $link );
                if ( $auto ) {
                        $titleObj = Title::newFromText( $returnto );
                        $wgOut->addMeta( "http:Refresh", "10;url=" . $titleObj->escapeFullURL() );
                }
                $wgOut->addHTML( "\n<p>$r</p>\n" );
        }

        # This function takes the existing and broken links for the page
        # and uses the first 10 of them for META keywords
        function addMetaTags ()
        {
                global $wgLinkCache , $wgOut ;
                $good = array_keys ( $wgLinkCache->mGoodLinks ) ;
                $bad = array_keys ( $wgLinkCache->mBadLinks ) ;
                $a = array_merge ( $good , $bad ) ;
                $a = array_slice ( $a , 0 , 10 ) ; # 10 keywords max
                $a = implode ( "," , $a ) ;
                $strip = array(
                        "/<.*?>/" => '',
                        "/[_]/" => ' '
                );
                $a = htmlspecialchars(preg_replace(array_keys($strip), array_values($strip),$a ));
                
                $wgOut->addMeta ( "KEYWORDS" , $a ) ;
        }

        /* private */ function headElement()
        {
                global $wgDocType, $wgDTD, $wgLanguageCode, $wgOutputEncoding, $wgMimeType;
                global $wgUser, $wgLang, $wgRequest;

                $xml = ($wgMimeType == 'text/xml');
                if( $xml ) {
                        $ret = "<" . "?xml version=\"1.0\" encoding=\"$wgOutputEncoding\" ?" . ">\n";
                } else {
                        $ret = "";
                }
                
                $ret .= "<!DOCTYPE html PUBLIC \"$wgDocType\"\n        \"$wgDTD\">\n";

                if ( "" == $this->mHTMLtitle ) {
                        $this->mHTMLtitle = wfMsg( "pagetitle", $this->mPagetitle );
                }
                if( $xml ) {
                        $xmlbits = "xmlns=\"http://www.w3.org/1999/xhtml\" xml:lang=\"en\"";
                } else {
                        $xmlbits = "";
                }
                $rtl = $wgLang->isRTL() ? " dir='RTL'" : "";
                $ret .= "<html $xmlbits lang=\"$wgLanguageCode\" $rtl>\n";
                $ret .= "<head>\n<title>" . htmlspecialchars( $this->mHTMLtitle ) . "</title>\n";
                array_push( $this->mMetatags, array( "http:Content-type", "$wgMimeType; charset={$wgOutputEncoding}" ) );
                
                $ret .= $this->getHeadLinks();
                global $wgStylePath;
                if( $this->isPrintable() ) {
                        $media = "";
                } else {
                        $media = "media='print'";
                }
                $printsheet = htmlspecialchars( "$wgStylePath/wikiprintable.css" );
                $ret .= "<link rel='stylesheet' type='text/css' $media href='$printsheet' />\n";

                $sk = $wgUser->getSkin();
                $ret .= $sk->getHeadScripts();
                $ret .= $this->mScripts;
                $ret .= $sk->getUserStyles();

                $ret .= "</head>\n";
                return $ret;
        }
        
        function getHeadLinks() {
                global $wgRequest, $wgStylePath;
                $ret = "";
                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";
                        }
                        $ret .= "<meta $a=\"{$tag[0]}\" content=\"{$tag[1]}\" />\n";
                }
                $p = $this->mRobotpolicy;
                if ( "" == $p ) { $p = "index,follow"; }
                $ret .= "<meta name=\"robots\" content=\"$p\" />\n";

                if ( count( $this->mKeywords ) > 0 ) {
                        $strip = array(
                                "/<.*?>/" => '',
                                "/[_]/" => ' '
                        );
                        $ret .= "<meta name=\"keywords\" content=\"" .
                          htmlspecialchars(preg_replace(array_keys($strip), array_values($strip),implode( ",", $this->mKeywords ))) . "\" />\n";
                }
                foreach ( $this->mLinktags as $tag ) {
                        $ret .= "<link";
                        foreach( $tag as $attr => $val ) {
                                $ret .= " $attr=\"" . htmlspecialchars( $val ) . "\"";
                        }
                        $ret .= " />\n";
                }
                if( $this->isSyndicated() ) {
                        # FIXME: centralize the mime-type and name information in Feed.php
                        $link = $wgRequest->escapeAppendQuery( "feed=rss" );
                        $ret .= "<link rel='alternate' type='application/rss+xml' title='RSS 2.0' href='$link' />\n";
                        $link = $wgRequest->escapeAppendQuery( "feed=atom" );
                        $ret .= "<link rel='alternate' type='application/rss+atom' title='Atom 0.3' href='$link' />\n";
                }
                # FIXME: get these working
                # $fix = htmlspecialchars( $wgStylePath . "/ie-png-fix.js" );
                # $ret .= "<!--[if gte IE 5.5000]><script type='text/javascript' src='$fix'></script><![endif]-->";
                return $ret;
        }
}
?>

---