includes/OutputPage.php

   1 <?php
   2 # See design.doc
   3
   4 if($wgUseTeX) include_once( "Math.php" );
   5
   6 class OutputPage {
   7         var $mHeaders, $mCookies, $mMetatags, $mKeywords;
   8         var $mLinktags, $mPagetitle, $mBodytext, $mDebugtext;
   9         var $mHTMLtitle, $mRobotpolicy, $mIsarticle, $mPrintable;
  10         var $mSubtitle, $mRedirect, $mHeadtext;
  11         var $mLastModified, $mCategoryLinks;
  12
  13         var $mSuppressQuickbar;
  14         var $mOnloadHandler;
  15         var $mDoNothing;
  16         var $mContainsOldMagic, $mContainsNewMagic;
  17         var $mIsArticleRelated;
  18         var $mParserOptions;
  19         var $mShowFeedLinks = false;
  20
  21         function OutputPage()
  22         {
  23                 $this->mHeaders = $this->mCookies = $this->mMetatags =
  24                 $this->mKeywords = $this->mLinktags = array();
  25                 $this->mHTMLtitle = $this->mPagetitle = $this->mBodytext =
  26                 $this->mRedirect = $this->mLastModified =
  27                 $this->mSubtitle = $this->mDebugtext = $this->mRobotpolicy =
  28                 $this->mOnloadHandler = "";
  29                 $this->mIsArticleRelated = $this->mIsarticle = $this->mPrintable = true;
  30                 $this->mSuppressQuickbar = $this->mPrintable = false;
  31                 $this->mLanguageLinks = array();
  32                 $this->mCategoryLinks = array() ;
  33                 $this->mDoNothing = false;
  34                 $this->mContainsOldMagic = $this->mContainsNewMagic = 0;
  35                 $this->mParserOptions = ParserOptions::newFromUser( $temp = NULL );
  36                 $this->mSquidMaxage = 0;
  37         }
  38
  39         function addHeader( $name, $val ) { array_push( $this->mHeaders, "$name: $val" ) ; }
  40         function addCookie( $name, $val ) { array_push( $this->mCookies, array( $name, $val ) ); }
  41         function redirect( $url, $responsecode = '302' ) { $this->mRedirect = $url; $this->mRedirectCode = $responsecode; }
  42
  43         # To add an http-equiv meta tag, precede the name with "http:"
  44         function addMeta( $name, $val ) { array_push( $this->mMetatags, array( $name, $val ) ); }
  45         function addKeyword( $text ) { array_push( $this->mKeywords, $text ); }
  46         function addLink( $rel, $rev, $target ) { array_push( $this->mLinktags, array( $rel, $rev, $target ) ); }
  47
  48         # checkLastModified tells the client to use the client-cached page if
  49         # possible. If sucessful, the OutputPage is disabled so that
  50         # any future call to OutputPage->output() have no effect. The method
  51         # returns true iff cache-ok headers was sent.
  52         function checkLastModified ( $timestamp )
  53         {
  54                 global $wgLang, $wgCachePages, $wgUser;
  55                 if( !$wgCachePages ) {
  56                         wfDebug( "CACHE DISABLED\n", false );
  57                         return;
  58                 }
  59                 if( preg_match( '/MSIE ([1-4]|5\.0)/', $_SERVER["HTTP_USER_AGENT"] ) ) {
  60                         # IE 5.0 has probs with our caching
  61                         wfDebug( "-- bad client, not caching\n", false );
  62                         return;
  63                 }
  64                 if( $wgUser->getOption( "nocache" ) ) {
  65                         wfDebug( "USER DISABLED CACHE\n", false );
  66                         return;
  67                 }
  68
  69                 $lastmod = gmdate( "D, j M Y H:i:s", wfTimestamp2Unix(
  70                         max( $timestamp, $wgUser->mTouched ) ) ) . " GMT";
  71
  72                 if( !empty( $_SERVER["HTTP_IF_MODIFIED_SINCE"] ) ) {
  73                         # IE sends sizes after the date like this:
  74                         # Wed, 20 Aug 2003 06:51:19 GMT; length=5202
  75                         # this breaks strtotime().
  76                         $modsince = preg_replace( '/;.*$/', '', $_SERVER["HTTP_IF_MODIFIED_SINCE"] );
  77                         $ismodsince = wfUnix2Timestamp( strtotime( $modsince ) );
  78                         wfDebug( "-- client send If-Modified-Since: " . $modsince . "\n", false );
  79                         wfDebug( "--  we might send Last-Modified : $lastmod\n", false );
  80
  81                         if( ($ismodsince >= $timestamp ) and $wgUser->validateCache( $ismodsince ) ) {
  82                                 # Make sure you're in a place you can leave when you call us!
  83                                 header( "HTTP/1.0 304 Not Modified" );
  84                                 $this->mLastModified = $lastmod;
  85                                 $this->sendCacheControl();
  86                                 wfDebug( "CACHED client: $ismodsince ; user: $wgUser->mTouched ; page: $timestamp\n", false );
  87                                 $this->disable();
  88                                 return true;
  89                         } else {
  90                                 wfDebug( "READY  client: $ismodsince ; user: $wgUser->mTouched ; page: $timestamp\n", false );
  91                                 $this->mLastModified = $lastmod;
  92                         }
  93                 } else {
  94                         wfDebug( "We're confused.\n", false );
  95                         $this->mLastModified = $lastmod;
  96                 }
  97         }
  98
  99         function setRobotpolicy( $str ) { $this->mRobotpolicy = $str; }
 100         function setHTMLtitle( $name ) { $this->mHTMLtitle = $name; }
 101         function setPageTitle( $name ) { $this->mPagetitle = $name; }
 102         function getPageTitle() { return $this->mPagetitle; }
 103         function setSubtitle( $str ) { $this->mSubtitle = $str; }
 104         function getSubtitle() { return $this->mSubtitle; }
 105         function isArticle() { return $this->mIsarticle; }
 106         function setPrintable() { $this->mPrintable = true; }
 107         function isPrintable() { return $this->mPrintable; }
 108         function setSyndicated( $show = true ) { $this->mShowFeedLinks = $show; }
 109         function isSyndicated() { return $this->mShowFeedLinks; }
 110         function setOnloadHandler( $js ) { $this->mOnloadHandler = $js; }
 111         function getOnloadHandler() { return $this->mOnloadHandler; }
 112         function disable() { $this->mDoNothing = true; }
 113
 114         function setArticleRelated( $v )
 115         {
 116                 $this->mIsArticleRelated = $v;
 117                 if ( !$v ) {
 118                         $this->mIsarticle = false;
 119                 }
 120         }
 121         function setArticleFlag( $v ) {
 122                 $this->mIsarticle = $v;
 123                 if ( $v ) {
 124                         $this->mIsArticleRelated = $v;
 125                 }
 126         }
 127
 128         function isArticleRelated()
 129         {
 130                 return $this->mIsArticleRelated;
 131         }
 132
 133         function getLanguageLinks() {
 134                 global $wgTitle, $wgLanguageCode;
 135                 global $wgDBconnection, $wgDBname;
 136                 return $this->mLanguageLinks;
 137         }
 138         function suppressQuickbar() { $this->mSuppressQuickbar = true; }
 139         function isQuickbarSuppressed() { return $this->mSuppressQuickbar; }
 140
 141         function addHTML( $text ) { $this->mBodytext .= $text; }
 142         function addHeadtext( $text ) { $this->mHeadtext .= $text; }
 143         function debug( $text ) { $this->mDebugtext .= $text; }
 144
 145         function setParserOptions( $options )
 146         {
 147                 return wfSetVar( $this->mParserOptions, $options );
 148         }
 149
 150         # First pass--just handle <nowiki> sections, pass the rest off
 151         # to doWikiPass2() which does all the real work.
 152         #
 153         # $cacheArticle - assume this text is the main text for the given article
 154         #
 155         function addWikiText( $text, $linestart = true, $cacheArticle = NULL )
 156         {
 157                 global $wgParser, $wgParserCache, $wgUser, $wgTitle;
 158
 159                 $parserOutput = false;
 160                 if ( $cacheArticle ) {
 161                         $parserOutput = $wgParserCache->get( $cacheArticle, $wgUser );
 162                 }
 163
 164                 if ( $parserOutput === false ) {
 165                         $parserOutput = $wgParser->parse( $text, $wgTitle, $this->mParserOptions, $linestart );
 166                         if ( $cacheArticle ) {
 167                                 $wgParserCache->save( $parserOutput, $cacheArticle, $wgUser );
 168                         }
 169                 }
 170
 171                 $this->mLanguageLinks += $parserOutput->getLanguageLinks();
 172                 $this->mCategoryLinks += $parserOutput->getCategoryLinks();
 173
 174                 $this->addHTML( $parserOutput->getText() );
 175
 176         }
 177
 178         # Set the maximum cache time on the Squid in seconds
 179         function setSquidMaxage( $maxage ) {
 180                 $this->mSquidMaxage = $maxage;
 181         }
 182
 183         function sendCacheControl() {
 184                 global $wgUseSquid, $wgUseESI;
 185                 # FIXME: This header may cause trouble with some versions of Internet Explorer
 186                 header( "Vary: Accept-Encoding, Cookie" );
 187                 if( $this->mLastModified != "" ) {
 188                         if( $wgUseSquid && ! isset( $_COOKIE[ini_get( "session.name") ] ) &&
 189                           ! $this->isPrintable() )
 190                         {
 191                                 if ( $wgUseESI ) {
 192                                         # We'll purge the proxy cache explicitly, but require end user agents
 193                                         # to revalidate against the proxy on each visit.
 194                                         # Surrogate-Control controls our Squid, Cache-Control downstream caches
 195                                         wfDebug( "** proxy caching with ESI; {$this->mLastModified} **\n", false );
 196                                         # start with a shorter timeout for initial testing
 197                                         # header( 'Surrogate-Control: max-age=2678400+2678400, content="ESI/1.0"');
 198                                         header( 'Surrogate-Control: max-age='.$wgSquidMaxage.'+'.$this->mSquidMaxage.', content="ESI/1.0"');
 199                                         header( 'Cache-Control: s-maxage=0, must-revalidate, max-age=0' );
 200                                 } else {
 201                                         # We'll purge the proxy cache for anons explicitly, but require end user agents
 202                                         # to revalidate against the proxy on each visit.
 203                                         # IMPORTANT! The Squid needs to replace the Cache-Control header with
 204                                         # Cache-Control: s-maxage=0, must-revalidate, max-age=0
 205                                         wfDebug( "** local proxy caching; {$this->mLastModified} **\n", false );
 206                                         # start with a shorter timeout for initial testing
 207                                         # header( "Cache-Control: s-maxage=2678400, must-revalidate, max-age=0" );
 208                                         header( 'Cache-Control: s-maxage='.$this->mSquidMaxage.', must-revalidate, max-age=0' );
 209                                 }
 210                         } else {
 211                                 # We do want clients to cache if they can, but they *must* check for updates
 212                                 # on revisiting the page.
 213                                 wfDebug( "** private caching; {$this->mLastModified} **\n", false );
 214                                 header( "Expires: -1" );
 215                                 header( "Cache-Control: private, must-revalidate, max-age=0" );
 216                         }
 217                         header( "Last-modified: {$this->mLastModified}" );
 218                 } else {
 219                         wfDebug( "** no caching **\n", false );
 220                         header( "Expires: -1" );
 221                         header( "Cache-Control: no-cache" );
 222                         header( "Pragma: no-cache" );
 223                         header( "Last-modified: " . gmdate( "D, j M Y H:i:s" ) . " GMT" );
 224                 }
 225         }
 226
 227         # Finally, all the text has been munged and accumulated into
 228         # the object, let's actually output it:
 229         #
 230         function output()
 231         {
 232                 global $wgUser, $wgLang, $wgDebugComments, $wgCookieExpiration;
 233                 global $wgInputEncoding, $wgOutputEncoding, $wgLanguageCode;
 234                 global $wgDebugRedirects;
 235                 if( $this->mDoNothing ){
 236                         return;
 237                 }
 238                 $fname = "OutputPage::output";
 239                 wfProfileIn( $fname );
 240
 241                 $sk = $wgUser->getSkin();
 242
 243                 if ( "" != $this->mRedirect ) {
 244                         if( substr( $this->mRedirect, 0, 4 ) != "http" ) {
 245                                 # Standards require redirect URLs to be absolute
 246                                 global $wgServer;
 247                                 $this->mRedirect = $wgServer . $this->mRedirect;
 248                         }
 249                         if( $this->mRedirectCode == '301') {
 250                                 if( !$wgDebugRedirects ) {
 251                                         header("HTTP/1.1 {$this->mRedirectCode} Moved Permanently");
 252                                 }
 253                                 $this->mLastModified = gmdate( "D, j M Y H:i:s" ) . " GMT";
 254                         }
 255
 256                         $this->sendCacheControl();
 257
 258                         if( $wgDebugRedirects ) {
 259                                 $url = htmlspecialchars( $this->mRedirect );
 260                                 print "<html>\n<head>\n<title>Redirect</title>\n</head>\n<body>\n";
 261                                 print "<p>Location: <a href=\"$url\">$url</a></p>\n";
 262                                 print "</body>\n</html>\n";
 263                         } else {
 264                                 header( "Location: {$this->mRedirect}" );
 265                         }
 266                         return;
 267                 }
 268
 269
 270                 $this->sendCacheControl();
 271
 272                 header( "Content-type: text/html; charset={$wgOutputEncoding}" );
 273                 header( "Content-language: {$wgLanguageCode}" );
 274
 275                 $exp = time() + $wgCookieExpiration;
 276                 foreach( $this->mCookies as $name => $val ) {
 277                         setcookie( $name, $val, $exp, "/" );
 278                 }
 279
 280                 $sk->outputPage( $this );
 281                 # flush();
 282         }
 283
 284         function out( $ins )
 285         {
 286                 global $wgInputEncoding, $wgOutputEncoding, $wgLang;
 287                 if ( 0 == strcmp( $wgInputEncoding, $wgOutputEncoding ) ) {
 288                         $outs = $ins;
 289                 } else {
 290                         $outs = $wgLang->iconv( $wgInputEncoding, $wgOutputEncoding, $ins );
 291                         if ( false === $outs ) { $outs = $ins; }
 292                 }
 293                 print $outs;
 294         }
 295
 296         function setEncodings()
 297         {
 298                 global $wgInputEncoding, $wgOutputEncoding;
 299                 global $wgUser, $wgLang;
 300
 301                 $wgInputEncoding = strtolower( $wgInputEncoding );
 302
 303                 if( $wgUser->getOption( 'altencoding' ) ) {
 304                         $wgLang->setAltEncoding();
 305                         return;
 306                 }
 307
 308                 if ( empty( $_SERVER['HTTP_ACCEPT_CHARSET'] ) ) {
 309                         $wgOutputEncoding = strtolower( $wgOutputEncoding );
 310                         return;
 311                 }
 312
 313                 /*
 314                 # This code is unused anyway!
 315                 # Commenting out. --bv 2003-11-15
 316
 317                 $a = explode( ",", $_SERVER['HTTP_ACCEPT_CHARSET'] );
 318                 $best = 0.0;
 319                 $bestset = "*";
 320
 321                 foreach ( $a as $s ) {
 322                         if ( preg_match( "/(.*);q=(.*)/", $s, $m ) ) {
 323                                 $set = $m[1];
 324                                 $q = (float)($m[2]);
 325                         } else {
 326                                 $set = $s;
 327                                 $q = 1.0;
 328                         }
 329                         if ( $q > $best ) {
 330                                 $bestset = $set;
 331                                 $best = $q;
 332                         }
 333                 }
 334                 #if ( "*" == $bestset ) { $bestset = "iso-8859-1"; }
 335                 if ( "*" == $bestset ) { $bestset = $wgOutputEncoding; }
 336                 $wgOutputEncoding = strtolower( $bestset );
 337
 338 # Disable for now
 339 #
 340                 */
 341                 $wgOutputEncoding = $wgInputEncoding;
 342         }
 343
 344         # Returns a HTML comment with the elapsed time since request.
 345         # This method has no side effects.
 346         function reportTime()
 347         {
 348                 global $wgRequestTime;
 349
 350                 $now = wfTime();
 351                 list( $usec, $sec ) = explode( " ", $wgRequestTime );
 352                 $start = (float)$sec + (float)$usec;
 353                 $elapsed = $now - $start;
 354                 $com = sprintf( "<!-- Time since request: %01.2f secs. -->",
 355                   $elapsed );
 356                 return $com;
 357         }
 358
 359         # Note: these arguments are keys into wfMsg(), not text!
 360         #
 361         function errorpage( $title, $msg )
 362         {
 363                 global $wgTitle;
 364
 365                 $this->mDebugtext .= "Original title: " .
 366                   $wgTitle->getPrefixedText() . "\n";
 367                 $this->setHTMLTitle( wfMsg( "errorpagetitle" ) );
 368                 $this->setPageTitle( wfMsg( $title ) );
 369                 $this->setRobotpolicy( "noindex,nofollow" );
 370                 $this->setArticleRelated( false );
 371
 372                 $this->mBodytext = "";
 373                 $this->addHTML( "<p>" . wfMsg( $msg ) . "\n" );
 374                 $this->returnToMain( false );
 375
 376                 $this->output();
 377                 wfAbruptExit();
 378         }
 379
 380         function sysopRequired()
 381         {
 382                 global $wgUser;
 383
 384                 $this->setHTMLTitle( wfMsg( "errorpagetitle" ) );
 385                 $this->setPageTitle( wfMsg( "sysoptitle" ) );
 386                 $this->setRobotpolicy( "noindex,nofollow" );
 387                 $this->setArticleRelated( false );
 388                 $this->mBodytext = "";
 389
 390                 $sk = $wgUser->getSkin();
 391                 $ap = $sk->makeKnownLink( wfMsg( "administrators" ), "" );
 392                 $this->addHTML( wfMsg( "sysoptext", $ap ) );
 393                 $this->returnToMain();
 394         }
 395
 396         function developerRequired()
 397         {
 398                 global $wgUser;
 399
 400                 $this->setHTMLTitle( wfMsg( "errorpagetitle" ) );
 401                 $this->setPageTitle( wfMsg( "developertitle" ) );
 402                 $this->setRobotpolicy( "noindex,nofollow" );
 403                 $this->setArticleRelated( false );
 404                 $this->mBodytext = "";
 405
 406                 $sk = $wgUser->getSkin();
 407                 $ap = $sk->makeKnownLink( wfMsg( "administrators" ), "" );
 408                 $this->addHTML( wfMsg( "developertext", $ap ) );
 409                 $this->returnToMain();
 410         }
 411
 412         function loginToUse()
 413         {
 414                 global $wgUser, $wgTitle, $wgLang;
 415
 416                 $this->setHTMLTitle( wfMsg( "errorpagetitle" ) );
 417                 $this->setPageTitle( wfMsg( "loginreqtitle" ) );
 418                 $this->setRobotpolicy( "noindex,nofollow" );
 419                 $this->setArticleFlag( false );
 420                 $this->mBodytext = "";
 421                 $this->addWikiText( wfMsg( "loginreqtext" ) );
 422
 423                 # We put a comment in the .html file so a Sysop can diagnose the page the
 424                 # user can't see.
 425                 $this->addHTML( "\n<!--" .
 426                                                 $wgLang->getNsText( $wgTitle->getNamespace() ) .
 427                                                 ":" .
 428                                                 $wgTitle->getDBkey() . "-->" );
 429                 $this->returnToMain();          # Flip back to the main page after 10 seconds.
 430         }
 431
 432         function databaseError( $fname, &$conn )
 433         {
 434                 global $wgUser, $wgCommandLineMode;
 435
 436                 $this->setPageTitle( wfMsgNoDB( "databaseerror" ) );
 437                 $this->setRobotpolicy( "noindex,nofollow" );
 438                 $this->setArticleRelated( false );
 439
 440                 if ( $wgCommandLineMode ) {
 441                         $msg = wfMsgNoDB( "dberrortextcl" );
 442                 } else {
 443                         $msg = wfMsgNoDB( "dberrortext" );
 444                 }
 445
 446                 $msg = str_replace( "$1", htmlspecialchars( $conn->lastQuery() ), $msg );
 447                 $msg = str_replace( "$2", htmlspecialchars( $fname ), $msg );
 448                 $msg = str_replace( "$3", $conn->lastErrno(), $msg );
 449                 $msg = str_replace( "$4", htmlspecialchars( $conn->lastError() ), $msg );
 450
 451                 if ( $wgCommandLineMode || !is_object( $wgUser )) {
 452                         print "$msg\n";
 453                         wfAbruptExit();
 454                 }
 455                 $sk = $wgUser->getSkin();
 456                 $shlink = $sk->makeKnownLink( wfMsgNoDB( "searchhelppage" ),
 457                   wfMsgNoDB( "searchingwikipedia" ) );
 458                 $msg = str_replace( "$5", $shlink, $msg );
 459                 $this->mBodytext = $msg;
 460                 $this->output();
 461                 wfAbruptExit();
 462         }
 463
 464         function readOnlyPage( $source = "", $protected = false )
 465         {
 466                 global $wgUser, $wgReadOnlyFile;
 467
 468                 $this->setRobotpolicy( "noindex,nofollow" );
 469                 $this->setArticleRelated( false );
 470
 471                 if( $protected ) {
 472                         $this->setPageTitle( wfMsg( "viewsource" ) );
 473                         $this->addWikiText( wfMsg( "protectedtext" ) );
 474                 } else {
 475                         $this->setPageTitle( wfMsg( "readonly" ) );
 476                         $reason = file_get_contents( $wgReadOnlyFile );
 477                         $this->addHTML( wfMsg( "readonlytext", $reason ) );
 478                 }
 479
 480                 if($source) {
 481                         $rows = $wgUser->getOption( "rows" );
 482                         $cols = $wgUser->getOption( "cols" );
 483                         $text .= "</p>\n<textarea cols='$cols' rows='$rows' readonly>" .
 484                                 htmlspecialchars( $source ) . "\n</textarea>";
 485                         $this->addHTML( $text );
 486                 }
 487
 488                 $this->returnToMain( false );
 489         }
 490
 491         function fatalError( $message )
 492         {
 493                 $this->setPageTitle( wfMsg( "internalerror" ) );
 494                 $this->setRobotpolicy( "noindex,nofollow" );
 495                 $this->setArticleRelated( false );
 496
 497                 $this->mBodytext = $message;
 498                 $this->output();
 499                 wfAbruptExit();
 500         }
 501
 502         function unexpectedValueError( $name, $val )
 503         {
 504                 $this->fatalError( wfMsg( "unexpected", $name, $val ) );
 505         }
 506
 507         function fileCopyError( $old, $new )
 508         {
 509                 $this->fatalError( wfMsg( "filecopyerror", $old, $new ) );
 510         }
 511
 512         function fileRenameError( $old, $new )
 513         {
 514                 $this->fatalError( wfMsg( "filerenameerror", $old, $new ) );
 515         }
 516
 517         function fileDeleteError( $name )
 518         {
 519                 $this->fatalError( wfMsg( "filedeleteerror", $name ) );
 520         }
 521
 522         function fileNotFoundError( $name )
 523         {
 524                 $this->fatalError( wfMsg( "filenotfound", $name ) );
 525         }
 526
 527         function returnToMain( $auto = true )
 528         {
 529                 global $wgUser, $wgOut, $returnto;
 530
 531                 $sk = $wgUser->getSkin();
 532                 if ( "" == $returnto ) {
 533                         $returnto = wfMsg( "mainpage" );
 534                 }
 535                 $link = $sk->makeKnownLink( $returnto, "" );
 536
 537                 $r = wfMsg( "returnto", $link );
 538                 if ( $auto ) {
 539                         $titleObj = Title::newFromText( $returnto );
 540                         $wgOut->addMeta( "http:Refresh", "10;url=" . $titleObj->escapeFullURL() );
 541                 }
 542                 $wgOut->addHTML( "\n<p>$r\n" );
 543         }
 544
 545         /* private */ function headElement()
 546         {
 547                 global $wgDocType, $wgDTD, $wgUser, $wgLanguageCode, $wgOutputEncoding, $wgLang;
 548
 549                 $ret = "<!DOCTYPE HTML PUBLIC \"$wgDocType\"\n        \"$wgDTD\">\n";
 550
 551                 if ( "" == $this->mHTMLtitle ) {
 552                         $this->mHTMLtitle = $this->mPagetitle;
 553                 }
 554                 $rtl = $wgLang->isRTL() ? " dir='RTL'" : "";
 555                 $ret .= "<html lang=\"$wgLanguageCode\"$rtl><head><title>{$this->mHTMLtitle}</title>\n";
 556                 array_push( $this->mMetatags, array( "http:Content-type", "text/html; charset={$wgOutputEncoding}" ) );
 557                 foreach ( $this->mMetatags as $tag ) {
 558                         if ( 0 == strcasecmp( "http:", substr( $tag[0], 0, 5 ) ) ) {
 559                                 $a = "http-equiv";
 560                                 $tag[0] = substr( $tag[0], 5 );
 561                         } else {
 562                                 $a = "name";
 563                         }
 564                         $ret .= "<meta $a=\"{$tag[0]}\" content=\"{$tag[1]}\">\n";
 565                 }
 566                 $p = $this->mRobotpolicy;
 567                 if ( "" == $p ) { $p = "index,follow"; }
 568                 $ret .= "<meta name=\"robots\" content=\"$p\">\n";
 569
 570                 if ( count( $this->mKeywords ) > 0 ) {
 571                         $ret .= "<meta name=\"keywords\" content=\"" .
 572                           implode( ",", $this->mKeywords ) . "\">\n";
 573                 }
 574                 foreach ( $this->mLinktags as $tag ) {
 575                         $ret .= "<link ";
 576                         if ( "" != $tag[0] ) { $ret .= "rel=\"{$tag[0]}\" "; }
 577                         if ( "" != $tag[1] ) { $ret .= "rev=\"{$tag[1]}\" "; }
 578                         $ret .= "href=\"{$tag[2]}\">\n";
 579                 }
 580                 $sk = $wgUser->getSkin();
 581                 $ret .= $sk->getHeadScripts();
 582                 $ret .= $sk->getUserStyles();
 583
 584                 $ret .= "</head>\n";
 585                 return $ret;
 586         }
 587 }
 588 ?>