includes/OutputPage.php

   1 <?php
   2 if ( ! defined( 'MEDIAWIKI' ) )
   3         die( 1 );
   4 /**
   5  */
   6
   7 /**
   8  * @todo document
   9  */
  10 class OutputPage {
  11         var $mMetatags, $mKeywords;
  12         var $mLinktags, $mPagetitle, $mBodytext, $mDebugtext;
  13         var $mHTMLtitle, $mRobotpolicy, $mIsarticle, $mPrintable;
  14         var $mSubtitle, $mRedirect, $mStatusCode;
  15         var $mLastModified, $mETag, $mCategoryLinks;
  16         var $mScripts, $mLinkColours, $mPageLinkTitle;
  17
  18         var $mAllowUserJs;
  19         var $mSuppressQuickbar;
  20         var $mOnloadHandler;
  21         var $mDoNothing;
  22         var $mContainsOldMagic, $mContainsNewMagic;
  23         var $mIsArticleRelated;
  24         protected $mParserOptions; // lazy initialised, use parserOptions()
  25         var $mShowFeedLinks = false;
  26         var $mFeedLinksAppendQuery = false;
  27         var $mEnableClientCache = true;
  28         var $mArticleBodyOnly = false;
  29
  30         var $mNewSectionLink = false;
  31         var $mNoGallery = false;
  32         var $mPageTitleActionText = '';
  33
  34         /**
  35          * Constructor
  36          * Initialise private variables
  37          */
  38         function __construct() {
  39                 global $wgAllowUserJs;
  40                 $this->mAllowUserJs = $wgAllowUserJs;
  41                 $this->mMetatags = $this->mKeywords = $this->mLinktags = array();
  42                 $this->mHTMLtitle = $this->mPagetitle = $this->mBodytext =
  43                 $this->mRedirect = $this->mLastModified =
  44                 $this->mSubtitle = $this->mDebugtext = $this->mRobotpolicy =
  45                 $this->mOnloadHandler = $this->mPageLinkTitle = '';
  46                 $this->mIsArticleRelated = $this->mIsarticle = $this->mPrintable = true;
  47                 $this->mSuppressQuickbar = $this->mPrintable = false;
  48                 $this->mLanguageLinks = array();
  49                 $this->mCategoryLinks = array();
  50                 $this->mDoNothing = false;
  51                 $this->mContainsOldMagic = $this->mContainsNewMagic = 0;
  52                 $this->mParserOptions = null;
  53                 $this->mSquidMaxage = 0;
  54                 $this->mScripts = '';
  55                 $this->mHeadItems = array();
  56                 $this->mETag = false;
  57                 $this->mRevisionId = null;
  58                 $this->mNewSectionLink = false;
  59                 $this->mTemplateIds = array();
  60         }
  61
  62         public function redirect( $url, $responsecode = '302' ) {
  63                 # Strip newlines as a paranoia check for header injection in PHP<5.1.2
  64                 $this->mRedirect = str_replace( "\n", '', $url );
  65                 $this->mRedirectCode = $responsecode;
  66         }
  67
  68         public function getRedirect() {
  69                 return $this->mRedirect;
  70         }
  71
  72         /**
  73          * Set the HTTP status code to send with the output.
  74          *
  75          * @param int $statusCode
  76          * @return nothing
  77          */
  78         function setStatusCode( $statusCode ) { $this->mStatusCode = $statusCode; }
  79
  80         # To add an http-equiv meta tag, precede the name with "http:"
  81         function addMeta( $name, $val ) { array_push( $this->mMetatags, array( $name, $val ) ); }
  82         function addKeyword( $text ) { array_push( $this->mKeywords, $text ); }
  83         function addScript( $script ) { $this->mScripts .= "\t\t".$script; }
  84         function addStyle( $style ) {
  85                 global $wgStylePath, $wgStyleVersion;
  86                 $this->addLink(
  87                                 array(
  88                                         'rel' => 'stylesheet',
  89                                         'href' => $wgStylePath . '/' . $style . '?' . $wgStyleVersion ) );
  90         }
  91
  92         /**
  93          * Add a self-contained script tag with the given contents
  94          * @param string $script JavaScript text, no <script> tags
  95          */
  96         function addInlineScript( $script ) {
  97                 global $wgJsMimeType;
  98                 $this->mScripts .= "<script type=\"$wgJsMimeType\">/*<![CDATA[*/\n$script\n/*]]>*/</script>";
  99         }
 100
 101         function getScript() {
 102                 return $this->mScripts . $this->getHeadItems();
 103         }
 104
 105         function getHeadItems() {
 106                 $s = '';
 107                 foreach ( $this->mHeadItems as $item ) {
 108                         $s .= $item;
 109                 }
 110                 return $s;
 111         }
 112
 113         function addHeadItem( $name, $value ) {
 114                 $this->mHeadItems[$name] = $value;
 115         }
 116
 117         function hasHeadItem( $name ) {
 118                 return isset( $this->mHeadItems[$name] );
 119         }
 120
 121         function setETag($tag) { $this->mETag = $tag; }
 122         function setArticleBodyOnly($only) { $this->mArticleBodyOnly = $only; }
 123         function getArticleBodyOnly($only) { return $this->mArticleBodyOnly; }
 124
 125         function addLink( $linkarr ) {
 126                 # $linkarr should be an associative array of attributes. We'll escape on output.
 127                 array_push( $this->mLinktags, $linkarr );
 128         }
 129
 130         function addMetadataLink( $linkarr ) {
 131                 # note: buggy CC software only reads first "meta" link
 132                 static $haveMeta = false;
 133                 $linkarr['rel'] = ($haveMeta) ? 'alternate meta' : 'meta';
 134                 $this->addLink( $linkarr );
 135                 $haveMeta = true;
 136         }
 137
 138         /**
 139          * checkLastModified tells the client to use the client-cached page if
 140          * possible. If sucessful, the OutputPage is disabled so that
 141          * any future call to OutputPage->output() have no effect.
 142          *
 143          * @return bool True iff cache-ok headers was sent.
 144          */
 145         function checkLastModified ( $timestamp ) {
 146                 global $wgCachePages, $wgCacheEpoch, $wgUser, $wgRequest;
 147                 $fname = 'OutputPage::checkLastModified';
 148
 149                 if ( !$timestamp || $timestamp == '19700101000000' ) {
 150                         wfDebug( "$fname: CACHE DISABLED, NO TIMESTAMP\n" );
 151                         return;
 152                 }
 153                 if( !$wgCachePages ) {
 154                         wfDebug( "$fname: CACHE DISABLED\n", false );
 155                         return;
 156                 }
 157                 if( $wgUser->getOption( 'nocache' ) ) {
 158                         wfDebug( "$fname: USER DISABLED CACHE\n", false );
 159                         return;
 160                 }
 161
 162                 $timestamp=wfTimestamp(TS_MW,$timestamp);
 163                 $lastmod = wfTimestamp( TS_RFC2822, max( $timestamp, $wgUser->mTouched, $wgCacheEpoch ) );
 164
 165                 if( !empty( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) ) {
 166                         # IE sends sizes after the date like this:
 167                         # Wed, 20 Aug 2003 06:51:19 GMT; length=5202
 168                         # this breaks strtotime().
 169                         $modsince = preg_replace( '/;.*$/', '', $_SERVER["HTTP_IF_MODIFIED_SINCE"] );
 170
 171                         wfSuppressWarnings(); // E_STRICT system time bitching
 172                         $modsinceTime = strtotime( $modsince );
 173                         wfRestoreWarnings();
 174
 175                         $ismodsince = wfTimestamp( TS_MW, $modsinceTime ? $modsinceTime : 1 );
 176                         wfDebug( "$fname: -- client send If-Modified-Since: " . $modsince . "\n", false );
 177                         wfDebug( "$fname: --  we might send Last-Modified : $lastmod\n", false );
 178                         if( ($ismodsince >= $timestamp ) && $wgUser->validateCache( $ismodsince ) && $ismodsince >= $wgCacheEpoch ) {
 179                                 # Make sure you're in a place you can leave when you call us!
 180                                 $wgRequest->response()->header( "HTTP/1.0 304 Not Modified" );
 181                                 $this->mLastModified = $lastmod;
 182                                 $this->sendCacheControl();
 183                                 wfDebug( "$fname: CACHED client: $ismodsince ; user: $wgUser->mTouched ; page: $timestamp ; site $wgCacheEpoch\n", false );
 184                                 $this->disable();
 185
 186                                 // Don't output a compressed blob when using ob_gzhandler;
 187                                 // it's technically against HTTP spec and seems to confuse
 188                                 // Firefox when the response gets split over two packets.
 189                                 wfClearOutputBuffers();
 190
 191                                 return true;
 192                         } else {
 193                                 wfDebug( "$fname: READY  client: $ismodsince ; user: $wgUser->mTouched ; page: $timestamp ; site $wgCacheEpoch\n", false );
 194                                 $this->mLastModified = $lastmod;
 195                         }
 196                 } else {
 197                         wfDebug( "$fname: client did not send If-Modified-Since header\n", false );
 198                         $this->mLastModified = $lastmod;
 199                 }
 200         }
 201
 202         function setPageTitleActionText( $text ) {
 203                 $this->mPageTitleActionText = $text;
 204         }
 205
 206         function getPageTitleActionText () {
 207                 if ( isset( $this->mPageTitleActionText ) ) {
 208                         return $this->mPageTitleActionText;
 209                 }
 210         }
 211
 212         public function setRobotpolicy( $str ) { $this->mRobotpolicy = $str; }
 213         public function setHTMLTitle( $name ) {$this->mHTMLtitle = $name; }
 214         public function setPageTitle( $name ) {
 215                 global $action, $wgContLang;
 216                 $name = $wgContLang->convert($name, true);
 217                 $this->mPagetitle = $name;
 218                 if(!empty($action)) {
 219                         $taction =  $this->getPageTitleActionText();
 220                         if( !empty( $taction ) ) {
 221                                 $name .= ' - '.$taction;
 222                         }
 223                 }
 224
 225                 $this->setHTMLTitle( wfMsg( 'pagetitle', $name ) );
 226         }
 227         public function getHTMLTitle() { return $this->mHTMLtitle; }
 228         public function getPageTitle() { return $this->mPagetitle; }
 229         public function setSubtitle( $str ) { $this->mSubtitle = /*$this->parse(*/$str/*)*/; } // @bug 2514
 230         public function getSubtitle() { return $this->mSubtitle; }
 231         public function isArticle() { return $this->mIsarticle; }
 232         public function setPrintable() { $this->mPrintable = true; }
 233         public function isPrintable() { return $this->mPrintable; }
 234         public function setSyndicated( $show = true ) { $this->mShowFeedLinks = $show; }
 235         public function isSyndicated() { return $this->mShowFeedLinks; }
 236         public function setFeedAppendQuery( $val ) { $this->mFeedLinksAppendQuery = $val; }
 237         public function getFeedAppendQuery() { return $this->mFeedLinksAppendQuery; }
 238         public function setOnloadHandler( $js ) { $this->mOnloadHandler = $js; }
 239         public function getOnloadHandler() { return $this->mOnloadHandler; }
 240         public function disable() { $this->mDoNothing = true; }
 241
 242         public function setArticleRelated( $v ) {
 243                 $this->mIsArticleRelated = $v;
 244                 if ( !$v ) {
 245                         $this->mIsarticle = false;
 246                 }
 247         }
 248         public function setArticleFlag( $v ) {
 249                 $this->mIsarticle = $v;
 250                 if ( $v ) {
 251                         $this->mIsArticleRelated = $v;
 252                 }
 253         }
 254
 255         public function isArticleRelated() { return $this->mIsArticleRelated; }
 256
 257         public function getLanguageLinks() { return $this->mLanguageLinks; }
 258         public function addLanguageLinks($newLinkArray) {
 259                 $this->mLanguageLinks += $newLinkArray;
 260         }
 261         public function setLanguageLinks($newLinkArray) {
 262                 $this->mLanguageLinks = $newLinkArray;
 263         }
 264
 265         public function getCategoryLinks() {
 266                 return $this->mCategoryLinks;
 267         }
 268
 269         /**
 270          * Add an array of categories, with names in the keys
 271          */
 272         public function addCategoryLinks($categories) {
 273                 global $wgUser, $wgContLang;
 274
 275                 if ( !is_array( $categories ) ) {
 276                         return;
 277                 }
 278                 # Add the links to the link cache in a batch
 279                 $arr = array( NS_CATEGORY => $categories );
 280                 $lb = new LinkBatch;
 281                 $lb->setArray( $arr );
 282                 $lb->execute();
 283
 284                 $sk = $wgUser->getSkin();
 285                 foreach ( $categories as $category => $unused ) {
 286                         $title = Title::makeTitleSafe( NS_CATEGORY, $category );
 287                         $text = $wgContLang->convertHtml( $title->getText() );
 288                         $this->mCategoryLinks[] = $sk->makeLinkObj( $title, $text );
 289                 }
 290         }
 291
 292         public function setCategoryLinks($categories) {
 293                 $this->mCategoryLinks = array();
 294                 $this->addCategoryLinks($categories);
 295         }
 296
 297         public function suppressQuickbar() { $this->mSuppressQuickbar = true; }
 298         public function isQuickbarSuppressed() { return $this->mSuppressQuickbar; }
 299
 300         public function disallowUserJs() { $this->mAllowUserJs = false; }
 301         public function isUserJsAllowed() { return $this->mAllowUserJs; }
 302
 303         public function addHTML( $text ) { $this->mBodytext .= $text; }
 304         public function clearHTML() { $this->mBodytext = ''; }
 305         public function getHTML() { return $this->mBodytext; }
 306         public function debug( $text ) { $this->mDebugtext .= $text; }
 307
 308         /* @deprecated */
 309         public function setParserOptions( $options ) {
 310                 return $this->parserOptions( $options );
 311         }
 312
 313         public function parserOptions( $options = null ) {
 314                 if ( !$this->mParserOptions ) {
 315                         $this->mParserOptions = new ParserOptions;
 316                 }
 317                 return wfSetVar( $this->mParserOptions, $options );
 318         }
 319
 320         /**
 321          * Set the revision ID which will be seen by the wiki text parser
 322          * for things such as embedded {{REVISIONID}} variable use.
 323          * @param mixed $revid an integer, or NULL
 324          * @return mixed previous value
 325          */
 326         public function setRevisionId( $revid ) {
 327                 $val = is_null( $revid ) ? null : intval( $revid );
 328                 return wfSetVar( $this->mRevisionId, $val );
 329         }
 330
 331         /**
 332          * Convert wikitext to HTML and add it to the buffer
 333          * Default assumes that the current page title will
 334          * be used.
 335          *
 336          * @param string $text
 337          * @param bool   $linestart
 338          */
 339         public function addWikiText( $text, $linestart = true ) {
 340                 global $wgTitle;
 341                 $this->addWikiTextTitle($text, $wgTitle, $linestart);
 342         }
 343
 344         public function addWikiTextWithTitle($text, &$title, $linestart = true) {
 345                 $this->addWikiTextTitle($text, $title, $linestart);
 346         }
 347
 348         function addWikiTextTitleTidy($text, &$title, $linestart = true) {
 349                 $this->addWikiTextTitle( $text, $title, $linestart, true );
 350         }
 351
 352         public function addWikiTextTitle($text, &$title, $linestart, $tidy = false) {
 353                 global $wgParser;
 354
 355                 $fname = 'OutputPage:addWikiTextTitle';
 356                 wfProfileIn($fname);
 357
 358                 wfIncrStats('pcache_not_possible');
 359
 360                 $popts = $this->parserOptions();
 361                 $oldTidy = $popts->setTidy($tidy);
 362
 363                 $parserOutput = $wgParser->parse( $text, $title, $popts,
 364                         $linestart, true, $this->mRevisionId );
 365
 366                 $popts->setTidy( $oldTidy );
 367
 368                 $this->addParserOutput( $parserOutput );
 369
 370                 wfProfileOut($fname);
 371         }
 372
 373         /**
 374          * @todo document
 375          * @param ParserOutput object &$parserOutput
 376          */
 377         public function addParserOutputNoText( &$parserOutput ) {
 378                 $this->mLanguageLinks += $parserOutput->getLanguageLinks();
 379                 $this->addCategoryLinks( $parserOutput->getCategories() );
 380                 $this->mNewSectionLink = $parserOutput->getNewSection();
 381                 $this->addKeywords( $parserOutput );
 382                 if ( $parserOutput->getCacheTime() == -1 ) {
 383                         $this->enableClientCache( false );
 384                 }
 385                 $this->mNoGallery = $parserOutput->getNoGallery();
 386                 $this->mHeadItems = array_merge( $this->mHeadItems, (array)$parserOutput->mHeadItems );
 387                 // Versioning...
 388                 $this->mTemplateIds += (array)$parserOutput->mTemplateIds;
 389
 390                 # Display title
 391                 if( ( $dt = $parserOutput->getDisplayTitle() ) !== false )
 392                         $this->setPageTitle( $dt );
 393
 394                 # Hooks registered in the object
 395                 global $wgParserOutputHooks;
 396                 foreach ( $parserOutput->getOutputHooks() as $hookInfo ) {
 397                         list( $hookName, $data ) = $hookInfo;
 398                         if ( isset( $wgParserOutputHooks[$hookName] ) ) {
 399                                 call_user_func( $wgParserOutputHooks[$hookName], $this, $parserOutput, $data );
 400                         }
 401                 }
 402
 403                 wfRunHooks( 'OutputPageParserOutput', array( &$this, $parserOutput ) );
 404         }
 405
 406         /**
 407          * @todo document
 408          * @param ParserOutput &$parserOutput
 409          */
 410         function addParserOutput( &$parserOutput ) {
 411                 $this->addParserOutputNoText( $parserOutput );
 412                 $text = $parserOutput->getText();
 413                 wfRunHooks( 'OutputPageBeforeHTML',array( &$this, &$text ) );
 414                 $this->addHTML( $text );
 415         }
 416
 417         /**
 418          * Add wikitext to the buffer, assuming that this is the primary text for a page view
 419          * Saves the text into the parser cache if possible.
 420          *
 421          * @param string  $text
 422          * @param Article $article
 423          * @param bool    $cache
 424          * @deprecated Use Article::outputWikitext
 425          */
 426         public function addPrimaryWikiText( $text, $article, $cache = true ) {
 427                 global $wgParser, $wgUser;
 428
 429                 $popts = $this->parserOptions();
 430                 $popts->setTidy(true);
 431                 $parserOutput = $wgParser->parse( $text, $article->mTitle,
 432                         $popts, true, true, $this->mRevisionId );
 433                 $popts->setTidy(false);
 434                 if ( $cache && $article && $parserOutput->getCacheTime() != -1 ) {
 435                         $parserCache =& ParserCache::singleton();
 436                         $parserCache->save( $parserOutput, $article, $wgUser );
 437                 }
 438
 439                 $this->addParserOutput( $parserOutput );
 440         }
 441
 442         /**
 443          * @deprecated use addWikiTextTidy()
 444          */
 445         public function addSecondaryWikiText( $text, $linestart = true ) {
 446                 global $wgTitle;
 447                 $this->addWikiTextTitleTidy($text, $wgTitle, $linestart);
 448         }
 449
 450         /**
 451          * Add wikitext with tidy enabled
 452          */
 453         public function addWikiTextTidy(  $text, $linestart = true ) {
 454                 global $wgTitle;
 455                 $this->addWikiTextTitleTidy($text, $wgTitle, $linestart);
 456         }
 457
 458
 459         /**
 460          * Add the output of a QuickTemplate to the output buffer
 461          *
 462          * @param QuickTemplate $template
 463          */
 464         public function addTemplate( &$template ) {
 465                 ob_start();
 466                 $template->execute();
 467                 $this->addHTML( ob_get_contents() );
 468                 ob_end_clean();
 469         }
 470
 471         /**
 472          * Parse wikitext and return the HTML.
 473          *
 474          * @param string $text
 475          * @param bool   $linestart Is this the start of a line?
 476          * @param bool   $interface ??
 477          */
 478         public function parse( $text, $linestart = true, $interface = false ) {
 479                 global $wgParser, $wgTitle;
 480                 $popts = $this->parserOptions();
 481                 if ( $interface) { $popts->setInterfaceMessage(true); }
 482                 $parserOutput = $wgParser->parse( $text, $wgTitle, $popts,
 483                         $linestart, true, $this->mRevisionId );
 484                 if ( $interface) { $popts->setInterfaceMessage(false); }
 485                 return $parserOutput->getText();
 486         }
 487
 488         /**
 489          * @param Article $article
 490          * @param User    $user
 491          *
 492          * @return bool True if successful, else false.
 493          */
 494         public function tryParserCache( &$article, $user ) {
 495                 $parserCache =& ParserCache::singleton();
 496                 $parserOutput = $parserCache->get( $article, $user );
 497                 if ( $parserOutput !== false ) {
 498                         $this->addParserOutput( $parserOutput );
 499                         return true;
 500                 } else {
 501                         return false;
 502                 }
 503         }
 504
 505         /**
 506          * @param int $maxage Maximum cache time on the Squid, in seconds.
 507          */
 508         public function setSquidMaxage( $maxage ) {
 509                 $this->mSquidMaxage = $maxage;
 510         }
 511
 512         /**
 513          * Use enableClientCache(false) to force it to send nocache headers
 514          * @param $state ??
 515          */
 516         public function enableClientCache( $state ) {
 517                 return wfSetVar( $this->mEnableClientCache, $state );
 518         }
 519
 520         function uncacheableBecauseRequestvars() {
 521                 global $wgRequest;
 522                 return  $wgRequest->getText('useskin', false) === false
 523                         && $wgRequest->getText('uselang', false) === false;
 524         }
 525
 526         public function sendCacheControl() {
 527                 global $wgUseSquid, $wgUseESI, $wgUseETag, $wgSquidMaxage, $wgRequest;
 528                 $fname = 'OutputPage::sendCacheControl';
 529
 530                 if ($wgUseETag && $this->mETag)
 531                         $wgRequest->response()->header("ETag: $this->mETag");
 532
 533                 # don't serve compressed data to clients who can't handle it
 534                 # maintain different caches for logged-in users and non-logged in ones
 535                 $wgRequest->response()->header( 'Vary: Accept-Encoding, Cookie' );
 536                 if( !$this->uncacheableBecauseRequestvars() && $this->mEnableClientCache ) {
 537                         if( $wgUseSquid && session_id() == '' &&
 538                           ! $this->isPrintable() && $this->mSquidMaxage != 0 )
 539                         {
 540                                 if ( $wgUseESI ) {
 541                                         # We'll purge the proxy cache explicitly, but require end user agents
 542                                         # to revalidate against the proxy on each visit.
 543                                         # Surrogate-Control controls our Squid, Cache-Control downstream caches
 544                                         wfDebug( "$fname: proxy caching with ESI; {$this->mLastModified} **\n", false );
 545                                         # start with a shorter timeout for initial testing
 546                                         # header( 'Surrogate-Control: max-age=2678400+2678400, content="ESI/1.0"');
 547                                         $wgRequest->response()->header( 'Surrogate-Control: max-age='.$wgSquidMaxage.'+'.$this->mSquidMaxage.', content="ESI/1.0"');
 548                                         $wgRequest->response()->header( 'Cache-Control: s-maxage=0, must-revalidate, max-age=0' );
 549                                 } else {
 550                                         # We'll purge the proxy cache for anons explicitly, but require end user agents
 551                                         # to revalidate against the proxy on each visit.
 552                                         # IMPORTANT! The Squid needs to replace the Cache-Control header with
 553                                         # Cache-Control: s-maxage=0, must-revalidate, max-age=0
 554                                         wfDebug( "$fname: local proxy caching; {$this->mLastModified} **\n", false );
 555                                         # start with a shorter timeout for initial testing
 556                                         # header( "Cache-Control: s-maxage=2678400, must-revalidate, max-age=0" );
 557                                         $wgRequest->response()->header( 'Cache-Control: s-maxage='.$this->mSquidMaxage.', must-revalidate, max-age=0' );
 558                                 }
 559                         } else {
 560                                 # We do want clients to cache if they can, but they *must* check for updates
 561                                 # on revisiting the page.
 562                                 wfDebug( "$fname: private caching; {$this->mLastModified} **\n", false );
 563                                 $wgRequest->response()->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
 564                                 $wgRequest->response()->header( "Cache-Control: private, must-revalidate, max-age=0" );
 565                         }
 566                         if($this->mLastModified) $wgRequest->response()->header( "Last-modified: {$this->mLastModified}" );
 567                 } else {
 568                         wfDebug( "$fname: no caching **\n", false );
 569
 570                         # In general, the absence of a last modified header should be enough to prevent
 571                         # the client from using its cache. We send a few other things just to make sure.
 572                         $wgRequest->response()->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
 573                         $wgRequest->response()->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
 574                         $wgRequest->response()->header( 'Pragma: no-cache' );
 575                 }
 576         }
 577
 578         /**
 579          * Finally, all the text has been munged and accumulated into
 580          * the object, let's actually output it:
 581          */
 582         public function output() {
 583                 global $wgUser, $wgOutputEncoding, $wgRequest;
 584                 global $wgContLanguageCode, $wgDebugRedirects, $wgMimeType;
 585                 global $wgJsMimeType, $wgStylePath, $wgUseAjax, $wgAjaxSearch, $wgAjaxWatch;
 586                 global $wgServer, $wgStyleVersion;
 587
 588                 if( $this->mDoNothing ){
 589                         return;
 590                 }
 591                 $fname = 'OutputPage::output';
 592                 wfProfileIn( $fname );
 593                 $sk = $wgUser->getSkin();
 594
 595                 if ( $wgUseAjax ) {
 596                         $this->addScript( "<script type=\"{$wgJsMimeType}\" src=\"{$wgStylePath}/common/ajax.js?$wgStyleVersion\"></script>\n" );
 597
 598                         wfRunHooks( 'AjaxAddScript', array( &$this ) );
 599
 600                         if( $wgAjaxSearch ) {
 601                                 $this->addScript( "<script type=\"{$wgJsMimeType}\" src=\"{$wgStylePath}/common/ajaxsearch.js?$wgStyleVersion\"></script>\n" );
 602                                 $this->addScript( "<script type=\"{$wgJsMimeType}\">hookEvent(\"load\", sajax_onload);</script>\n" );
 603                         }
 604
 605                         if( $wgAjaxWatch && $wgUser->isLoggedIn() ) {
 606                                 $this->addScript( "<script type=\"{$wgJsMimeType}\" src=\"{$wgStylePath}/common/ajaxwatch.js?$wgStyleVersion\"></script>\n" );
 607                         }
 608                 }
 609
 610                 if ( '' != $this->mRedirect ) {
 611                         if( substr( $this->mRedirect, 0, 4 ) != 'http' ) {
 612                                 # Standards require redirect URLs to be absolute
 613                                 global $wgServer;
 614                                 $this->mRedirect = $wgServer . $this->mRedirect;
 615                         }
 616                         if( $this->mRedirectCode == '301') {
 617                                 if( !$wgDebugRedirects ) {
 618                                         $wgRequest->response()->header("HTTP/1.1 {$this->mRedirectCode} Moved Permanently");
 619                                 }
 620                                 $this->mLastModified = wfTimestamp( TS_RFC2822 );
 621                         }
 622
 623                         $this->sendCacheControl();
 624
 625                         $wgRequest->response()->header("Content-Type: text/html; charset=utf-8");
 626                         if( $wgDebugRedirects ) {
 627                                 $url = htmlspecialchars( $this->mRedirect );
 628                                 print "<html>\n<head>\n<title>Redirect</title>\n</head>\n<body>\n";
 629                                 print "<p>Location: <a href=\"$url\">$url</a></p>\n";
 630                                 print "</body>\n</html>\n";
 631                         } else {
 632                                 $wgRequest->response()->header( 'Location: '.$this->mRedirect );
 633                         }
 634                         wfProfileOut( $fname );
 635                         return;
 636                 }
 637                 elseif ( $this->mStatusCode )
 638                 {
 639                         $statusMessage = array(
 640                                 100 => 'Continue',
 641                                 101 => 'Switching Protocols',
 642                                 102 => 'Processing',
 643                                 200 => 'OK',
 644                                 201 => 'Created',
 645                                 202 => 'Accepted',
 646                                 203 => 'Non-Authoritative Information',
 647                                 204 => 'No Content',
 648                                 205 => 'Reset Content',
 649                                 206 => 'Partial Content',
 650                                 207 => 'Multi-Status',
 651                                 300 => 'Multiple Choices',
 652                                 301 => 'Moved Permanently',
 653                                 302 => 'Found',
 654                                 303 => 'See Other',
 655                                 304 => 'Not Modified',
 656                                 305 => 'Use Proxy',
 657                                 307 => 'Temporary Redirect',
 658                                 400 => 'Bad Request',
 659                                 401 => 'Unauthorized',
 660                                 402 => 'Payment Required',
 661                                 403 => 'Forbidden',
 662                                 404 => 'Not Found',
 663                                 405 => 'Method Not Allowed',
 664                                 406 => 'Not Acceptable',
 665                                 407 => 'Proxy Authentication Required',
 666                                 408 => 'Request Timeout',
 667                                 409 => 'Conflict',
 668                                 410 => 'Gone',
 669                                 411 => 'Length Required',
 670                                 412 => 'Precondition Failed',
 671                                 413 => 'Request Entity Too Large',
 672                                 414 => 'Request-URI Too Large',
 673                                 415 => 'Unsupported Media Type',
 674                                 416 => 'Request Range Not Satisfiable',
 675                                 417 => 'Expectation Failed',
 676                                 422 => 'Unprocessable Entity',
 677                                 423 => 'Locked',
 678                                 424 => 'Failed Dependency',
 679                                 500 => 'Internal Server Error',
 680                                 501 => 'Not Implemented',
 681                                 502 => 'Bad Gateway',
 682                                 503 => 'Service Unavailable',
 683                                 504 => 'Gateway Timeout',
 684                                 505 => 'HTTP Version Not Supported',
 685                                 507 => 'Insufficient Storage'
 686                         );
 687
 688                         if ( $statusMessage[$this->mStatusCode] )
 689                                 $wgRequest->response()->header( 'HTTP/1.1 ' . $this->mStatusCode . ' ' . $statusMessage[$this->mStatusCode] );
 690                 }
 691
 692                 # Buffer output; final headers may depend on later processing
 693                 ob_start();
 694
 695                 # Disable temporary placeholders, so that the skin produces HTML
 696                 $sk->postParseLinkColour( false );
 697
 698                 $wgRequest->response()->header( "Content-type: $wgMimeType; charset={$wgOutputEncoding}" );
 699                 $wgRequest->response()->header( 'Content-language: '.$wgContLanguageCode );
 700
 701                 if ($this->mArticleBodyOnly) {
 702                         $this->out($this->mBodytext);
 703                 } else {
 704                         wfProfileIn( 'Output-skin' );
 705                         $sk->outputPage( $this );
 706                         wfProfileOut( 'Output-skin' );
 707                 }
 708
 709                 $this->sendCacheControl();
 710                 ob_end_flush();
 711                 wfProfileOut( $fname );
 712         }
 713
 714         /**
 715          * @todo document
 716          * @param string $ins
 717          */
 718         public function out( $ins ) {
 719                 global $wgInputEncoding, $wgOutputEncoding, $wgContLang;
 720                 if ( 0 == strcmp( $wgInputEncoding, $wgOutputEncoding ) ) {
 721                         $outs = $ins;
 722                 } else {
 723                         $outs = $wgContLang->iconv( $wgInputEncoding, $wgOutputEncoding, $ins );
 724                         if ( false === $outs ) { $outs = $ins; }
 725                 }
 726                 print $outs;
 727         }
 728
 729         /**
 730          * @todo document
 731          */
 732         public static function setEncodings() {
 733                 global $wgInputEncoding, $wgOutputEncoding;
 734                 global $wgUser, $wgContLang;
 735
 736                 $wgInputEncoding = strtolower( $wgInputEncoding );
 737
 738                 if ( empty( $_SERVER['HTTP_ACCEPT_CHARSET'] ) ) {
 739                         $wgOutputEncoding = strtolower( $wgOutputEncoding );
 740                         return;
 741                 }
 742                 $wgOutputEncoding = $wgInputEncoding;
 743         }
 744
 745         /**
 746          * Deprecated, use wfReportTime() instead.
 747          * @return string
 748          * @deprecated
 749          */
 750         public function reportTime() {
 751                 $time = wfReportTime();
 752                 return $time;
 753         }
 754
 755         /**
 756          * Produce a "user is blocked" page.
 757          *
 758          * @param bool $return Whether to have a "return to $wgTitle" message or not.
 759          * @return nothing
 760          */
 761         function blockedPage( $return = true ) {
 762                 global $wgUser, $wgContLang, $wgTitle, $wgLang;
 763
 764                 $this->setPageTitle( wfMsg( 'blockedtitle' ) );
 765                 $this->setRobotpolicy( 'noindex,nofollow' );
 766                 $this->setArticleRelated( false );
 767
 768                 $name = User::whoIs( $wgUser->blockedBy() );
 769                 $reason = $wgUser->blockedFor();
 770                 if( $reason == '' ) {
 771                         $reason = wfMsg( 'blockednoreason' );
 772                 }
 773                 $blockTimestamp = $wgLang->timeanddate( wfTimestamp( TS_MW, $wgUser->mBlock->mTimestamp ), true );
 774                 $ip = wfGetIP();
 775
 776                 $link = '[[' . $wgContLang->getNsText( NS_USER ) . ":{$name}|{$name}]]";
 777
 778                 $blockid = $wgUser->mBlock->mId;
 779
 780                 $blockExpiry = $wgUser->mBlock->mExpiry;
 781                 if ( $blockExpiry == 'infinity' ) {
 782                         // Entry in database (table ipblocks) is 'infinity' but 'ipboptions' uses 'infinite' or 'indefinite'
 783                         // Search for localization in 'ipboptions'
 784                         $scBlockExpiryOptions = wfMsg( 'ipboptions' );
 785                         foreach ( explode( ',', $scBlockExpiryOptions ) as $option ) {
 786                                 if ( strpos( $option, ":" ) === false )
 787                                         continue;
 788                                 list( $show, $value ) = explode( ":", $option );
 789                                 if ( $value == 'infinite' || $value == 'indefinite' ) {
 790                                         $blockExpiry = $show;
 791                                         break;
 792                                 }
 793                         }
 794                 } else {
 795                         $blockExpiry = $wgLang->timeanddate( wfTimestamp( TS_MW, $blockExpiry ), true );
 796                 }
 797
 798                 if ( $wgUser->mBlock->mAuto ) {
 799                         $msg = 'autoblockedtext';
 800                 } else {
 801                         $msg = 'blockedtext';
 802                 }
 803
 804                 /* $ip returns who *is* being blocked, $intended contains who was meant to be blocked.
 805                  * This could be a username, an ip range, or a single ip. */
 806                 $intended = $wgUser->mBlock->mAddress;
 807
 808                 $this->addWikiText( wfMsg( $msg, $link, $reason, $ip, $name, $blockid, $blockExpiry, $intended, $blockTimestamp ) );
 809
 810                 # Don't auto-return to special pages
 811                 if( $return ) {
 812                         $return = $wgTitle->getNamespace() > -1 ? $wgTitle->getPrefixedText() : NULL;
 813                         $this->returnToMain( false, $return );
 814                 }
 815         }
 816
 817         /**
 818          * Output a standard error page
 819          *
 820          * @param string $title Message key for page title
 821          * @param string $msg Message key for page text
 822          * @param array $params Message parameters
 823          */
 824         public function showErrorPage( $title, $msg, $params = array() ) {
 825                 global $wgTitle;
 826
 827                 $this->mDebugtext .= 'Original title: ' .
 828                   $wgTitle->getPrefixedText() . "\n";
 829                 $this->setPageTitle( wfMsg( $title ) );
 830                 $this->setHTMLTitle( wfMsg( 'errorpagetitle' ) );
 831                 $this->setRobotpolicy( 'noindex,nofollow' );
 832                 $this->setArticleRelated( false );
 833                 $this->enableClientCache( false );
 834                 $this->mRedirect = '';
 835                 $this->mBodytext = '';
 836
 837                 array_unshift( $params, 'parse' );
 838                 array_unshift( $params, $msg );
 839                 $this->addHtml( call_user_func_array( 'wfMsgExt', $params ) );
 840
 841                 $this->returnToMain( false );
 842         }
 843
 844         /**
 845          * Output a standard permission error page
 846          *
 847          * @param array $errors Error message keys
 848          */
 849         public function showPermissionsErrorPage( $errors )
 850         {
 851                 global $wgTitle;
 852
 853                 $this->mDebugtext .= 'Original title: ' .
 854                          $wgTitle->getPrefixedText() . "\n";
 855                 $this->setPageTitle( wfMsg( 'permissionserrors' ) );
 856                 $this->setHTMLTitle( wfMsg( 'permissionserrors' ) );
 857                 $this->setRobotpolicy( 'noindex,nofollow' );
 858                 $this->setArticleRelated( false );
 859                 $this->enableClientCache( false );
 860                 $this->mRedirect = '';
 861                 $this->mBodytext = '';
 862                 $this->addWikiText( $this->formatPermissionsErrorMessage( $errors ) );
 863         }
 864
 865         /** @deprecated */
 866         public function errorpage( $title, $msg ) {
 867                 throw new ErrorPageError( $title, $msg );
 868         }
 869
 870         /**
 871          * Display an error page indicating that a given version of MediaWiki is
 872          * required to use it
 873          *
 874          * @param mixed $version The version of MediaWiki needed to use the page
 875          */
 876         public function versionRequired( $version ) {
 877                 $this->setPageTitle( wfMsg( 'versionrequired', $version ) );
 878                 $this->setHTMLTitle( wfMsg( 'versionrequired', $version ) );
 879                 $this->setRobotpolicy( 'noindex,nofollow' );
 880                 $this->setArticleRelated( false );
 881                 $this->mBodytext = '';
 882
 883                 $this->addWikiText( wfMsg( 'versionrequiredtext', $version ) );
 884                 $this->returnToMain();
 885         }
 886
 887         /**
 888          * Display an error page noting that a given permission bit is required.
 889          *
 890          * @param string $permission key required
 891          */
 892         public function permissionRequired( $permission ) {
 893                 global $wgGroupPermissions, $wgUser;
 894
 895                 $this->setPageTitle( wfMsg( 'badaccess' ) );
 896                 $this->setHTMLTitle( wfMsg( 'errorpagetitle' ) );
 897                 $this->setRobotpolicy( 'noindex,nofollow' );
 898                 $this->setArticleRelated( false );
 899                 $this->mBodytext = '';
 900
 901                 $groups = array();
 902                 foreach( $wgGroupPermissions as $key => $value ) {
 903                         if( isset( $value[$permission] ) && $value[$permission] == true ) {
 904                                 $groupName = User::getGroupName( $key );
 905                                 $groupPage = User::getGroupPage( $key );
 906                                 if( $groupPage ) {
 907                                         $skin = $wgUser->getSkin();
 908                                         $groups[] = $skin->makeLinkObj( $groupPage, $groupName );
 909                                 } else {
 910                                         $groups[] = $groupName;
 911                                 }
 912                         }
 913                 }
 914                 $n = count( $groups );
 915                 $groups = implode( ', ', $groups );
 916                 switch( $n ) {
 917                         case 0:
 918                         case 1:
 919                         case 2:
 920                                 $message = wfMsgHtml( "badaccess-group$n", $groups );
 921                                 break;
 922                         default:
 923                                 $message = wfMsgHtml( 'badaccess-groups', $groups );
 924                 }
 925                 $this->addHtml( $message );
 926                 $this->returnToMain( false );
 927         }
 928
 929         /**
 930          * Use permissionRequired.
 931          * @deprecated
 932          */
 933         public function sysopRequired() {
 934                 throw new MWException( "Call to deprecated OutputPage::sysopRequired() method\n" );
 935         }
 936
 937         /**
 938          * Use permissionRequired.
 939          * @deprecated
 940          */
 941         public function developerRequired() {
 942                 throw new MWException( "Call to deprecated OutputPage::developerRequired() method\n" );
 943         }
 944
 945         /**
 946          * Produce the stock "please login to use the wiki" page
 947          */
 948         public function loginToUse() {
 949                 global $wgUser, $wgTitle, $wgContLang;
 950
 951                 if( $wgUser->isLoggedIn() ) {
 952                         $this->permissionRequired( 'read' );
 953                         return;
 954                 }
 955
 956                 $skin = $wgUser->getSkin();
 957
 958                 $this->setPageTitle( wfMsg( 'loginreqtitle' ) );
 959                 $this->setHtmlTitle( wfMsg( 'errorpagetitle' ) );
 960                 $this->setRobotPolicy( 'noindex,nofollow' );
 961                 $this->setArticleFlag( false );
 962
 963                 $loginTitle = SpecialPage::getTitleFor( 'Userlogin' );
 964                 $loginLink = $skin->makeKnownLinkObj( $loginTitle, wfMsgHtml( 'loginreqlink' ), 'returnto=' . $wgTitle->getPrefixedUrl() );
 965                 $this->addHtml( wfMsgWikiHtml( 'loginreqpagetext', $loginLink ) );
 966                 $this->addHtml( "\n<!--" . $wgTitle->getPrefixedUrl() . "-->" );
 967
 968                 # Don't return to the main page if the user can't read it
 969                 # otherwise we'll end up in a pointless loop
 970                 $mainPage = Title::newMainPage();
 971                 if( $mainPage->userCanRead() )
 972                         $this->returnToMain( true, $mainPage );
 973         }
 974
 975         /** @deprecated */
 976         public function databaseError( $fname, $sql, $error, $errno ) {
 977                 throw new MWException( "OutputPage::databaseError is obsolete\n" );
 978         }
 979
 980         /**
 981          * @param array $errors An array of arrays returned by Title::getUserPermissionsErrors
 982          * @return string The error-messages, formatted into a list.
 983          */
 984         public function formatPermissionsErrorMessage( $errors ) {
 985                 $text = '';
 986
 987                 if (sizeof( $errors ) > 1) {
 988
 989                         $text .= wfMsgExt( 'permissionserrorstext', array( 'parse' ), count( $errors ) ) . "\n";
 990                         $text .= '<ul class="permissions-errors">' . "\n";
 991
 992                         foreach( $errors as $error )
 993                         {
 994                                 $text .= '<li>';
 995                                 $text .= call_user_func_array( 'wfMsg', $error );
 996                                 $text .= "</li>\n";
 997                         }
 998                         $text .= '</ul>';
 999                 } else {
1000                         $text .= call_user_func_array( 'wfMsg', $errors[0]);
1001                 }
1002
1003                 return $text;
1004         }
1005
1006         /**
1007          * Display a page stating that the Wiki is in read-only mode,
1008          * and optionally show the source of the page that the user
1009          * was trying to edit.  Should only be called (for this
1010          * purpose) after wfReadOnly() has returned true.
1011          *
1012          * For historical reasons, this function is _also_ used to
1013          * show the error message when a user tries to edit a page
1014          * they are not allowed to edit.  (Unless it's because they're
1015          * blocked, then we show blockedPage() instead.)  In this
1016          * case, the second parameter should be set to true and a list
1017          * of reasons supplied as the third parameter.
1018          *
1019          * @todo Needs to be split into multiple functions.
1020          *
1021          * @param string $source    Source code to show (or null).
1022          * @param bool   $protected Is this a permissions error?
1023          * @param array  $reasons   List of reasons for this error, as returned by Title::getUserPermissionsErrors().
1024          */
1025         public function readOnlyPage( $source = null, $protected = false, $reasons = array() ) {
1026                 global $wgUser, $wgReadOnlyFile, $wgReadOnly, $wgTitle;
1027                 $skin = $wgUser->getSkin();
1028
1029                 $this->setRobotpolicy( 'noindex,nofollow' );
1030                 $this->setArticleRelated( false );
1031
1032                 // If no reason is given, just supply a default "I can't let you do
1033                 // that, Dave" message.  Should only occur if called by legacy code.
1034                 if ( $protected && empty($reasons) ) {
1035                         $reasons[] = array( 'badaccess-group0' );
1036                 }
1037
1038                 if ( !empty($reasons) ) {
1039                         // Permissions error
1040                         $this->setPageTitle( wfMsg( 'viewsource' ) );
1041                         $this->setSubtitle( wfMsg( 'viewsourcefor', $skin->makeKnownLinkObj( $wgTitle ) ) );
1042                         $this->addWikiText( $this->formatPermissionsErrorMessage( $reasons ) );
1043                 } else {
1044                         // Wiki is read only
1045                         $this->setPageTitle( wfMsg( 'readonly' ) );
1046                         if ( $wgReadOnly ) {
1047                                 $reason = $wgReadOnly;
1048                         } else {
1049                                 // Should not happen, user should have called wfReadOnly() first
1050                                 $reason = file_get_contents( $wgReadOnlyFile );
1051                         }
1052                         $this->addWikiText( wfMsg( 'readonlytext', $reason ) );
1053                 }
1054
1055                 // Show source, if supplied
1056                 if( is_string( $source ) ) {
1057                         $this->addWikiText( wfMsg( 'viewsourcetext' ) );
1058                         $text = wfOpenElement( 'textarea',
1059                                                 array( 'id'   => 'wpTextbox1',
1060                                                        'name' => 'wpTextbox1',
1061                                                        'cols' => $wgUser->getOption( 'cols' ),
1062                                                        'rows' => $wgUser->getOption( 'rows' ),
1063                                                        'readonly' => 'readonly' ) );
1064                         $text .= htmlspecialchars( $source );
1065                         $text .= wfCloseElement( 'textarea' );
1066                         $this->addHTML( $text );
1067
1068                         // Show templates used by this article
1069                         $skin = $wgUser->getSkin();
1070                         $article = new Article( $wgTitle );
1071                         $this->addHTML( $skin->formatTemplates( $article->getUsedTemplates() ) );
1072                 }
1073
1074                 $this->returnToMain( false, $wgTitle );
1075         }
1076
1077         /** @deprecated */
1078         public function fatalError( $message ) {
1079                 throw new FatalError( $message );
1080         }
1081
1082         /** @deprecated */
1083         public function unexpectedValueError( $name, $val ) {
1084                 throw new FatalError( wfMsg( 'unexpected', $name, $val ) );
1085         }
1086
1087         /** @deprecated */
1088         public function fileCopyError( $old, $new ) {
1089                 throw new FatalError( wfMsg( 'filecopyerror', $old, $new ) );
1090         }
1091
1092         /** @deprecated */
1093         public function fileRenameError( $old, $new ) {
1094                 throw new FatalError( wfMsg( 'filerenameerror', $old, $new ) );
1095         }
1096
1097         /** @deprecated */
1098         public function fileDeleteError( $name ) {
1099                 throw new FatalError( wfMsg( 'filedeleteerror', $name ) );
1100         }
1101
1102         /** @deprecated */
1103         public function fileNotFoundError( $name ) {
1104                 throw new FatalError( wfMsg( 'filenotfound', $name ) );
1105         }
1106
1107         public function showFatalError( $message ) {
1108                 $this->setPageTitle( wfMsg( "internalerror" ) );
1109                 $this->setRobotpolicy( "noindex,nofollow" );
1110                 $this->setArticleRelated( false );
1111                 $this->enableClientCache( false );
1112                 $this->mRedirect = '';
1113                 $this->mBodytext = $message;
1114         }
1115
1116         public function showUnexpectedValueError( $name, $val ) {
1117                 $this->showFatalError( wfMsg( 'unexpected', $name, $val ) );
1118         }
1119
1120         public function showFileCopyError( $old, $new ) {
1121                 $this->showFatalError( wfMsg( 'filecopyerror', $old, $new ) );
1122         }
1123
1124         public function showFileRenameError( $old, $new ) {
1125                 $this->showFatalError( wfMsg( 'filerenameerror', $old, $new ) );
1126         }
1127
1128         public function showFileDeleteError( $name ) {
1129                 $this->showFatalError( wfMsg( 'filedeleteerror', $name ) );
1130         }
1131
1132         public function showFileNotFoundError( $name ) {
1133                 $this->showFatalError( wfMsg( 'filenotfound', $name ) );
1134         }
1135
1136         /**
1137          * Add a "return to" link pointing to a specified title
1138          *
1139          * @param Title $title Title to link
1140          */
1141         public function addReturnTo( $title ) {
1142                 global $wgUser;
1143                 $link = wfMsg( 'returnto', $wgUser->getSkin()->makeLinkObj( $title ) );
1144                 $this->addHtml( "<p>{$link}</p>\n" );
1145         }
1146
1147         /**
1148          * Add a "return to" link pointing to a specified title,
1149          * or the title indicated in the request, or else the main page
1150          *
1151          * @param null $unused No longer used
1152          * @param Title $returnto Title to return to
1153          */
1154         public function returnToMain( $unused = null, $returnto = NULL ) {
1155                 global $wgRequest;
1156
1157                 if ( $returnto == NULL ) {
1158                         $returnto = $wgRequest->getText( 'returnto' );
1159                 }
1160
1161                 if ( '' === $returnto ) {
1162                         $returnto = Title::newMainPage();
1163                 }
1164
1165                 if ( is_object( $returnto ) ) {
1166                         $titleObj = $returnto;
1167                 } else {
1168                         $titleObj = Title::newFromText( $returnto );
1169                 }
1170                 if ( !is_object( $titleObj ) ) {
1171                         $titleObj = Title::newMainPage();
1172                 }
1173
1174                 $this->addReturnTo( $titleObj );
1175         }
1176
1177         /**
1178          * This function takes the title (first item of mGoodLinks), categories, existing and broken links for the page
1179          * and uses the first 10 of them for META keywords
1180          *
1181          * @param ParserOutput &$parserOutput
1182          */
1183         private function addKeywords( &$parserOutput ) {
1184                 global $wgTitle;
1185                 $this->addKeyword( $wgTitle->getPrefixedText() );
1186                 $count = 1;
1187                 $links2d =& $parserOutput->getLinks();
1188                 if ( !is_array( $links2d ) ) {
1189                         return;
1190                 }
1191                 foreach ( $links2d as $dbkeys ) {
1192                         foreach( $dbkeys as $dbkey => $unused ) {
1193                                 $this->addKeyword( $dbkey );
1194                                 if ( ++$count > 10 ) {
1195                                         break 2;
1196                                 }
1197                         }
1198                 }
1199         }
1200
1201         /**
1202          * @return string The doctype, opening <html>, and head element.
1203          */
1204         public function headElement() {
1205                 global $wgDocType, $wgDTD, $wgContLanguageCode, $wgOutputEncoding, $wgMimeType;
1206                 global $wgXhtmlDefaultNamespace, $wgXhtmlNamespaces;
1207                 global $wgUser, $wgContLang, $wgUseTrackbacks, $wgTitle, $wgStyleVersion;
1208
1209                 if( $wgMimeType == 'text/xml' || $wgMimeType == 'application/xhtml+xml' || $wgMimeType == 'application/xml' ) {
1210                         $ret = "<?xml version=\"1.0\" encoding=\"$wgOutputEncoding\" ?>\n";
1211                 } else {
1212                         $ret = '';
1213                 }
1214
1215                 $ret .= "<!DOCTYPE html PUBLIC \"$wgDocType\"\n        \"$wgDTD\">\n";
1216
1217                 if ( '' == $this->getHTMLTitle() ) {
1218                         $this->setHTMLTitle(  wfMsg( 'pagetitle', $this->getPageTitle() ));
1219                 }
1220
1221                 $rtl = $wgContLang->isRTL() ? " dir='RTL'" : '';
1222                 $ret .= "<html xmlns=\"{$wgXhtmlDefaultNamespace}\" ";
1223                 foreach($wgXhtmlNamespaces as $tag => $ns) {
1224                         $ret .= "xmlns:{$tag}=\"{$ns}\" ";
1225                 }
1226                 $ret .= "xml:lang=\"$wgContLanguageCode\" lang=\"$wgContLanguageCode\" $rtl>\n";
1227                 $ret .= "<head>\n<title>" . htmlspecialchars( $this->getHTMLTitle() ) . "</title>\n";
1228                 array_push( $this->mMetatags, array( "http:Content-type", "$wgMimeType; charset={$wgOutputEncoding}" ) );
1229
1230                 $ret .= $this->getHeadLinks();
1231                 global $wgStylePath;
1232                 if( $this->isPrintable() ) {
1233                         $media = '';
1234                 } else {
1235                         $media = "media='print'";
1236                 }
1237                 $printsheet = htmlspecialchars( "$wgStylePath/common/wikiprintable.css?$wgStyleVersion" );
1238                 $ret .= "<link rel='stylesheet' type='text/css' $media href='$printsheet' />\n";
1239
1240                 $sk = $wgUser->getSkin();
1241                 $ret .= $sk->getHeadScripts( $this->mAllowUserJs );
1242                 $ret .= $this->mScripts;
1243                 $ret .= $sk->getUserStyles();
1244                 $ret .= $this->getHeadItems();
1245
1246                 if ($wgUseTrackbacks && $this->isArticleRelated())
1247                         $ret .= $wgTitle->trackbackRDF();
1248
1249                 $ret .= "</head>\n";
1250                 return $ret;
1251         }
1252
1253         /**
1254          * @return string HTML tag links to be put in the header.
1255          */
1256         public function getHeadLinks() {
1257                 global $wgRequest;
1258                 $ret = '';
1259                 foreach ( $this->mMetatags as $tag ) {
1260                         if ( 0 == strcasecmp( 'http:', substr( $tag[0], 0, 5 ) ) ) {
1261                                 $a = 'http-equiv';
1262                                 $tag[0] = substr( $tag[0], 5 );
1263                         } else {
1264                                 $a = 'name';
1265                         }
1266                         $ret .= "<meta $a=\"{$tag[0]}\" content=\"{$tag[1]}\" />\n";
1267                 }
1268
1269                 $p = $this->mRobotpolicy;
1270                 if( $p !== '' && $p != 'index,follow' ) {
1271                         // http://www.robotstxt.org/wc/meta-user.html
1272                         // Only show if it's different from the default robots policy
1273                         $ret .= "<meta name=\"robots\" content=\"$p\" />\n";
1274                 }
1275
1276                 if ( count( $this->mKeywords ) > 0 ) {
1277                         $strip = array(
1278                                 "/<.*?>/" => '',
1279                                 "/_/" => ' '
1280                         );
1281                         $ret .= "\t\t<meta name=\"keywords\" content=\"" .
1282                           htmlspecialchars(preg_replace(array_keys($strip), array_values($strip),implode( ",", $this->mKeywords ))) . "\" />\n";
1283                 }
1284                 foreach ( $this->mLinktags as $tag ) {
1285                         $ret .= "\t\t<link";
1286                         foreach( $tag as $attr => $val ) {
1287                                 $ret .= " $attr=\"" . htmlspecialchars( $val ) . "\"";
1288                         }
1289                         $ret .= " />\n";
1290                 }
1291
1292                 if( $this->isSyndicated() ) {
1293                         # Use the page name for the title (accessed through $wgTitle since
1294                         # there's no other way).  In principle, this could lead to issues
1295                         # with having the same name for different feeds corresponding to
1296                         # the same page, but we can't avoid that at this low a level.
1297                         global $wgTitle, $wgFeedClasses;
1298
1299                         if( is_string( $this->getFeedAppendQuery() ) ) {
1300                                 $appendQuery = "&" . $this->getFeedAppendQuery();
1301                         } else {
1302                                 $appendQuery = "";
1303                         }
1304
1305                         foreach( $wgFeedClasses as $format => $class ) {
1306                                 $ret .= $this->feedLink(
1307                                         $format,
1308                                         $wgRequest->appendQuery( "feed=rss{$appendQuery}" ),
1309                                         wfMsg( "page-{$format}-feed", $wgTitle->getPrefixedText() ) );
1310                         }
1311                 }
1312
1313                 # Recent changes feed should appear on every page
1314                 # Put it after the per-page feed to avoid changing existing behavior.
1315                 # It's still available, probably via a menu in your browser.
1316                 global $wgSitename;
1317                 $rctitle = SpecialPage::getTitleFor( 'Recentchanges' );
1318                 $ret .= $this->feedLink(
1319                         'rss',
1320                         $rctitle->getFullURL( 'feed=rss' ),
1321                         wfMsg( 'site-rss-feed', $wgSitename ) );
1322                 $ret .= $this->feedLink(
1323                         'atom',
1324                         $rctitle->getFullURL( 'feed=atom' ),
1325                         wfMsg( 'site-atom-feed', $wgSitename ) );
1326
1327                 return $ret;
1328         }
1329
1330         /**
1331          * Generate a <link rel/> for an RSS feed.
1332          */
1333         private function feedLink( $type, $url, $text ) {
1334                 return Xml::element( 'link', array(
1335                         'rel' => 'alternate',
1336                         'type' => "application/$type+xml",
1337                         'title' => $text,
1338                         'href' => $url ) ) . "\n";
1339         }
1340
1341         /**
1342          * Turn off regular page output and return an error reponse
1343          * for when rate limiting has triggered.
1344          */
1345         public function rateLimited() {
1346                 global $wgOut;
1347
1348                 $this->setPageTitle(wfMsg('actionthrottled'));
1349                 $this->setRobotPolicy( 'noindex,follow' );
1350                 $this->setArticleRelated( false );
1351                 $this->enableClientCache( false );
1352                 $this->mRedirect = '';
1353                 $this->clearHTML();
1354                 $this->setStatusCode(503);
1355                 $this->addWikiText( wfMsg('actionthrottledtext') );
1356
1357                 $this->returnToMain( false, $wgTitle );
1358         }
1359
1360         /**
1361          * Show an "add new section" link?
1362          *
1363          * @return bool
1364          */
1365         public function showNewSectionLink() {
1366                 return $this->mNewSectionLink;
1367         }
1368
1369         /**
1370          * Show a warning about slave lag
1371          *
1372          * If the lag is higher than $wgSlaveLagCritical seconds,
1373          * then the warning is a bit more obvious. If the lag is
1374          * lower than $wgSlaveLagWarning, then no warning is shown.
1375          *
1376          * @param int $lag Slave lag
1377          */
1378         public function showLagWarning( $lag ) {
1379                 global $wgSlaveLagWarning, $wgSlaveLagCritical;
1380                 if( $lag >= $wgSlaveLagWarning ) {
1381                         $message = $lag < $wgSlaveLagCritical
1382                                 ? 'lag-warn-normal'
1383                                 : 'lag-warn-high';
1384                         $warning = wfMsgExt( $message, 'parse', $lag );
1385                         $this->addHtml( "<div class=\"mw-{$message}\">\n{$warning}\n</div>\n" );
1386                 }
1387         }
1388
1389 }