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 $mEnableClientCache = true;
  27         var $mArticleBodyOnly = false;
  28
  29         var $mNewSectionLink = false;
  30         var $mNoGallery = false;
  31         var $mPageTitleActionText = '';
  32
  33         /**
  34          * Constructor
  35          * Initialise private variables
  36          */
  37         function __construct() {
  38                 global $wgAllowUserJs;
  39                 $this->mAllowUserJs = $wgAllowUserJs;
  40                 $this->mMetatags = $this->mKeywords = $this->mLinktags = array();
  41                 $this->mHTMLtitle = $this->mPagetitle = $this->mBodytext =
  42                 $this->mRedirect = $this->mLastModified =
  43                 $this->mSubtitle = $this->mDebugtext = $this->mRobotpolicy =
  44                 $this->mOnloadHandler = $this->mPageLinkTitle = '';
  45                 $this->mIsArticleRelated = $this->mIsarticle = $this->mPrintable = true;
  46                 $this->mSuppressQuickbar = $this->mPrintable = false;
  47                 $this->mLanguageLinks = array();
  48                 $this->mCategoryLinks = array();
  49                 $this->mDoNothing = false;
  50                 $this->mContainsOldMagic = $this->mContainsNewMagic = 0;
  51                 $this->mParserOptions = null;
  52                 $this->mSquidMaxage = 0;
  53                 $this->mScripts = '';
  54                 $this->mHeadItems = array();
  55                 $this->mETag = false;
  56                 $this->mRevisionId = null;
  57                 $this->mNewSectionLink = false;
  58                 $this->mTemplateIds = array();
  59         }
  60
  61         public function redirect( $url, $responsecode = '302' ) {
  62                 # Strip newlines as a paranoia check for header injection in PHP<5.1.2
  63                 $this->mRedirect = str_replace( "\n", '', $url );
  64                 $this->mRedirectCode = $responsecode;
  65         }
  66
  67         public function getRedirect() {
  68                 return $this->mRedirect;
  69         }
  70
  71         /**
  72          * Set the HTTP status code to send with the output.
  73          *
  74          * @param int $statusCode
  75          * @return nothing
  76          */
  77         function setStatusCode( $statusCode ) { $this->mStatusCode = $statusCode; }
  78
  79         # To add an http-equiv meta tag, precede the name with "http:"
  80         function addMeta( $name, $val ) { array_push( $this->mMetatags, array( $name, $val ) ); }
  81         function addKeyword( $text ) { array_push( $this->mKeywords, $text ); }
  82         function addScript( $script ) { $this->mScripts .= "\t\t".$script; }
  83         function addStyle( $style ) {
  84                 global $wgStylePath, $wgStyleVersion;
  85                 $this->addLink(
  86                                 array(
  87                                         'rel' => 'stylesheet',
  88                                         'href' => $wgStylePath . '/' . $style . '?' . $wgStyleVersion ) );
  89         }
  90
  91         /**
  92          * Add a self-contained script tag with the given contents
  93          * @param string $script JavaScript text, no <script> tags
  94          */
  95         function addInlineScript( $script ) {
  96                 global $wgJsMimeType;
  97                 $this->mScripts .= "<script type=\"$wgJsMimeType\">/*<![CDATA[*/\n$script\n/*]]>*/</script>";
  98         }
  99
 100         function getScript() {
 101                 return $this->mScripts . $this->getHeadItems();
 102         }
 103
 104         function getHeadItems() {
 105                 $s = '';
 106                 foreach ( $this->mHeadItems as $item ) {
 107                         $s .= $item;
 108                 }
 109                 return $s;
 110         }
 111
 112         function addHeadItem( $name, $value ) {
 113                 $this->mHeadItems[$name] = $value;
 114         }
 115
 116         function hasHeadItem( $name ) {
 117                 return isset( $this->mHeadItems[$name] );
 118         }
 119
 120         function setETag($tag) { $this->mETag = $tag; }
 121         function setArticleBodyOnly($only) { $this->mArticleBodyOnly = $only; }
 122         function getArticleBodyOnly($only) { return $this->mArticleBodyOnly; }
 123
 124         function addLink( $linkarr ) {
 125                 # $linkarr should be an associative array of attributes. We'll escape on output.
 126                 array_push( $this->mLinktags, $linkarr );
 127         }
 128
 129         function addMetadataLink( $linkarr ) {
 130                 # note: buggy CC software only reads first "meta" link
 131                 static $haveMeta = false;
 132                 $linkarr['rel'] = ($haveMeta) ? 'alternate meta' : 'meta';
 133                 $this->addLink( $linkarr );
 134                 $haveMeta = true;
 135         }
 136
 137         /**
 138          * checkLastModified tells the client to use the client-cached page if
 139          * possible. If sucessful, the OutputPage is disabled so that
 140          * any future call to OutputPage->output() have no effect.
 141          *
 142          * @return bool True iff cache-ok headers was sent.
 143          */
 144         function checkLastModified ( $timestamp ) {
 145                 global $wgCachePages, $wgCacheEpoch, $wgUser, $wgRequest;
 146                 $fname = 'OutputPage::checkLastModified';
 147
 148                 if ( !$timestamp || $timestamp == '19700101000000' ) {
 149                         wfDebug( "$fname: CACHE DISABLED, NO TIMESTAMP\n" );
 150                         return;
 151                 }
 152                 if( !$wgCachePages ) {
 153                         wfDebug( "$fname: CACHE DISABLED\n", false );
 154                         return;
 155                 }
 156                 if( $wgUser->getOption( 'nocache' ) ) {
 157                         wfDebug( "$fname: USER DISABLED CACHE\n", false );
 158                         return;
 159                 }
 160
 161                 $timestamp=wfTimestamp(TS_MW,$timestamp);
 162                 $lastmod = wfTimestamp( TS_RFC2822, max( $timestamp, $wgUser->mTouched, $wgCacheEpoch ) );
 163
 164                 if( !empty( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) ) {
 165                         # IE sends sizes after the date like this:
 166                         # Wed, 20 Aug 2003 06:51:19 GMT; length=5202
 167                         # this breaks strtotime().
 168                         $modsince = preg_replace( '/;.*$/', '', $_SERVER["HTTP_IF_MODIFIED_SINCE"] );
 169
 170                         wfSuppressWarnings(); // E_STRICT system time bitching
 171                         $modsinceTime = strtotime( $modsince );
 172                         wfRestoreWarnings();
 173
 174                         $ismodsince = wfTimestamp( TS_MW, $modsinceTime ? $modsinceTime : 1 );
 175                         wfDebug( "$fname: -- client send If-Modified-Since: " . $modsince . "\n", false );
 176                         wfDebug( "$fname: --  we might send Last-Modified : $lastmod\n", false );
 177                         if( ($ismodsince >= $timestamp ) && $wgUser->validateCache( $ismodsince ) && $ismodsince >= $wgCacheEpoch ) {
 178                                 # Make sure you're in a place you can leave when you call us!
 179                                 $wgRequest->response()->header( "HTTP/1.0 304 Not Modified" );
 180                                 $this->mLastModified = $lastmod;
 181                                 $this->sendCacheControl();
 182                                 wfDebug( "$fname: CACHED client: $ismodsince ; user: $wgUser->mTouched ; page: $timestamp ; site $wgCacheEpoch\n", false );
 183                                 $this->disable();
 184
 185                                 // Don't output a compressed blob when using ob_gzhandler;
 186                                 // it's technically against HTTP spec and seems to confuse
 187                                 // Firefox when the response gets split over two packets.
 188                                 wfClearOutputBuffers();
 189
 190                                 return true;
 191                         } else {
 192                                 wfDebug( "$fname: READY  client: $ismodsince ; user: $wgUser->mTouched ; page: $timestamp ; site $wgCacheEpoch\n", false );
 193                                 $this->mLastModified = $lastmod;
 194                         }
 195                 } else {
 196                         wfDebug( "$fname: client did not send If-Modified-Since header\n", false );
 197                         $this->mLastModified = $lastmod;
 198                 }
 199         }
 200
 201         function setPageTitleActionText( $text ) {
 202                 $this->mPageTitleActionText = $text;
 203         }
 204
 205         function getPageTitleActionText () {
 206                 if ( isset( $this->mPageTitleActionText ) ) {
 207                         return $this->mPageTitleActionText;
 208                 }
 209         }
 210
 211         public function setRobotpolicy( $str ) { $this->mRobotpolicy = $str; }
 212         public function setHTMLTitle( $name ) {$this->mHTMLtitle = $name; }
 213         public function setPageTitle( $name ) {
 214                 global $action, $wgContLang;
 215                 $name = $wgContLang->convert($name, true);
 216                 $this->mPagetitle = $name;
 217                 if(!empty($action)) {
 218                         $taction =  $this->getPageTitleActionText();
 219                         if( !empty( $taction ) ) {
 220                                 $name .= ' - '.$taction;
 221                         }
 222                 }
 223
 224                 $this->setHTMLTitle( wfMsg( 'pagetitle', $name ) );
 225         }
 226         public function getHTMLTitle() { return $this->mHTMLtitle; }
 227         public function getPageTitle() { return $this->mPagetitle; }
 228         public function setSubtitle( $str ) { $this->mSubtitle = /*$this->parse(*/$str/*)*/; } // @bug 2514
 229         public function getSubtitle() { return $this->mSubtitle; }
 230         public function isArticle() { return $this->mIsarticle; }
 231         public function setPrintable() { $this->mPrintable = true; }
 232         public function isPrintable() { return $this->mPrintable; }
 233         public function setSyndicated( $show = true ) { $this->mShowFeedLinks = $show; }
 234         public function isSyndicated() { return $this->mShowFeedLinks; }
 235         public function setOnloadHandler( $js ) { $this->mOnloadHandler = $js; }
 236         public function getOnloadHandler() { return $this->mOnloadHandler; }
 237         public function disable() { $this->mDoNothing = true; }
 238
 239         public function setArticleRelated( $v ) {
 240                 $this->mIsArticleRelated = $v;
 241                 if ( !$v ) {
 242                         $this->mIsarticle = false;
 243                 }
 244         }
 245         public function setArticleFlag( $v ) {
 246                 $this->mIsarticle = $v;
 247                 if ( $v ) {
 248                         $this->mIsArticleRelated = $v;
 249                 }
 250         }
 251
 252         public function isArticleRelated() { return $this->mIsArticleRelated; }
 253
 254         public function getLanguageLinks() { return $this->mLanguageLinks; }
 255         public function addLanguageLinks($newLinkArray) {
 256                 $this->mLanguageLinks += $newLinkArray;
 257         }
 258         public function setLanguageLinks($newLinkArray) {
 259                 $this->mLanguageLinks = $newLinkArray;
 260         }
 261
 262         public function getCategoryLinks() {
 263                 return $this->mCategoryLinks;
 264         }
 265
 266         /**
 267          * Add an array of categories, with names in the keys
 268          */
 269         public function addCategoryLinks($categories) {
 270                 global $wgUser, $wgContLang;
 271
 272                 if ( !is_array( $categories ) ) {
 273                         return;
 274                 }
 275                 # Add the links to the link cache in a batch
 276                 $arr = array( NS_CATEGORY => $categories );
 277                 $lb = new LinkBatch;
 278                 $lb->setArray( $arr );
 279                 $lb->execute();
 280
 281                 $sk = $wgUser->getSkin();
 282                 foreach ( $categories as $category => $unused ) {
 283                         $title = Title::makeTitleSafe( NS_CATEGORY, $category );
 284                         $text = $wgContLang->convertHtml( $title->getText() );
 285                         $this->mCategoryLinks[] = $sk->makeLinkObj( $title, $text );
 286                 }
 287         }
 288
 289         public function setCategoryLinks($categories) {
 290                 $this->mCategoryLinks = array();
 291                 $this->addCategoryLinks($categories);
 292         }
 293
 294         public function suppressQuickbar() { $this->mSuppressQuickbar = true; }
 295         public function isQuickbarSuppressed() { return $this->mSuppressQuickbar; }
 296
 297         public function disallowUserJs() { $this->mAllowUserJs = false; }
 298         public function isUserJsAllowed() { return $this->mAllowUserJs; }
 299
 300         public function addHTML( $text ) { $this->mBodytext .= $text; }
 301         public function clearHTML() { $this->mBodytext = ''; }
 302         public function getHTML() { return $this->mBodytext; }
 303         public function debug( $text ) { $this->mDebugtext .= $text; }
 304
 305         /* @deprecated */
 306         public function setParserOptions( $options ) {
 307                 return $this->parserOptions( $options );
 308         }
 309
 310         public function parserOptions( $options = null ) {
 311                 if ( !$this->mParserOptions ) {
 312                         $this->mParserOptions = new ParserOptions;
 313                 }
 314                 return wfSetVar( $this->mParserOptions, $options );
 315         }
 316
 317         /**
 318          * Set the revision ID which will be seen by the wiki text parser
 319          * for things such as embedded {{REVISIONID}} variable use.
 320          * @param mixed $revid an integer, or NULL
 321          * @return mixed previous value
 322          */
 323         public function setRevisionId( $revid ) {
 324                 $val = is_null( $revid ) ? null : intval( $revid );
 325                 return wfSetVar( $this->mRevisionId, $val );
 326         }
 327
 328         /**
 329          * Convert wikitext to HTML and add it to the buffer
 330          * Default assumes that the current page title will
 331          * be used.
 332          *
 333          * @param string $text
 334          * @param bool   $linestart
 335          */
 336         public function addWikiText( $text, $linestart = true ) {
 337                 global $wgTitle;
 338                 $this->addWikiTextTitle($text, $wgTitle, $linestart);
 339         }
 340
 341         public function addWikiTextWithTitle($text, &$title, $linestart = true) {
 342                 $this->addWikiTextTitle($text, $title, $linestart);
 343         }
 344
 345         function addWikiTextTitleTidy($text, &$title, $linestart = true) {
 346                 $this->addWikiTextTitle( $text, $title, $linestart, true );
 347         }
 348
 349         public function addWikiTextTitle($text, &$title, $linestart, $tidy = false) {
 350                 global $wgParser;
 351
 352                 $fname = 'OutputPage:addWikiTextTitle';
 353                 wfProfileIn($fname);
 354
 355                 wfIncrStats('pcache_not_possible');
 356
 357                 $popts = $this->parserOptions();
 358                 $oldTidy = $popts->setTidy($tidy);
 359
 360                 $parserOutput = $wgParser->parse( $text, $title, $popts,
 361                         $linestart, true, $this->mRevisionId );
 362
 363                 $popts->setTidy( $oldTidy );
 364
 365                 $this->addParserOutput( $parserOutput );
 366
 367                 wfProfileOut($fname);
 368         }
 369
 370         /**
 371          * @todo document
 372          * @param ParserOutput object &$parserOutput
 373          */
 374         public function addParserOutputNoText( &$parserOutput ) {
 375                 $this->mLanguageLinks += $parserOutput->getLanguageLinks();
 376                 $this->addCategoryLinks( $parserOutput->getCategories() );
 377                 $this->mNewSectionLink = $parserOutput->getNewSection();
 378                 $this->addKeywords( $parserOutput );
 379                 if ( $parserOutput->getCacheTime() == -1 ) {
 380                         $this->enableClientCache( false );
 381                 }
 382                 $this->mNoGallery = $parserOutput->getNoGallery();
 383                 $this->mHeadItems = array_merge( $this->mHeadItems, (array)$parserOutput->mHeadItems );
 384                 // Versioning...
 385                 $this->mTemplateIds += (array)$parserOutput->mTemplateIds;
 386
 387                 # Display title
 388                 if( ( $dt = $parserOutput->getDisplayTitle() ) !== false )
 389                         $this->setPageTitle( $dt );
 390
 391                 # Hooks registered in the object
 392                 global $wgParserOutputHooks;
 393                 foreach ( $parserOutput->getOutputHooks() as $hookInfo ) {
 394                         list( $hookName, $data ) = $hookInfo;
 395                         if ( isset( $wgParserOutputHooks[$hookName] ) ) {
 396                                 call_user_func( $wgParserOutputHooks[$hookName], $this, $parserOutput, $data );
 397                         }
 398                 }
 399
 400                 wfRunHooks( 'OutputPageParserOutput', array( &$this, $parserOutput ) );
 401         }
 402
 403         /**
 404          * @todo document
 405          * @param ParserOutput &$parserOutput
 406          */
 407         function addParserOutput( &$parserOutput ) {
 408                 $this->addParserOutputNoText( $parserOutput );
 409                 $text = $parserOutput->getText();
 410                 wfRunHooks( 'OutputPageBeforeHTML',array( &$this, &$text ) );
 411                 $this->addHTML( $text );
 412         }
 413
 414         /**
 415          * Add wikitext to the buffer, assuming that this is the primary text for a page view
 416          * Saves the text into the parser cache if possible.
 417          *
 418          * @param string  $text
 419          * @param Article $article
 420          * @param bool    $cache
 421          * @deprecated Use Article::outputWikitext
 422          */
 423         public function addPrimaryWikiText( $text, $article, $cache = true ) {
 424                 global $wgParser, $wgUser;
 425
 426                 $popts = $this->parserOptions();
 427                 $popts->setTidy(true);
 428                 $parserOutput = $wgParser->parse( $text, $article->mTitle,
 429                         $popts, true, true, $this->mRevisionId );
 430                 $popts->setTidy(false);
 431                 if ( $cache && $article && $parserOutput->getCacheTime() != -1 ) {
 432                         $parserCache =& ParserCache::singleton();
 433                         $parserCache->save( $parserOutput, $article, $wgUser );
 434                 }
 435
 436                 $this->addParserOutput( $parserOutput );
 437         }
 438
 439         /**
 440          * @deprecated use addWikiTextTidy()
 441          */
 442         public function addSecondaryWikiText( $text, $linestart = true ) {
 443                 global $wgTitle;
 444                 $this->addWikiTextTitleTidy($text, $wgTitle, $linestart);
 445         }
 446
 447         /**
 448          * Add wikitext with tidy enabled
 449          */
 450         public function addWikiTextTidy(  $text, $linestart = true ) {
 451                 global $wgTitle;
 452                 $this->addWikiTextTitleTidy($text, $wgTitle, $linestart);
 453         }
 454
 455
 456         /**
 457          * Add the output of a QuickTemplate to the output buffer
 458          *
 459          * @param QuickTemplate $template
 460          */
 461         public function addTemplate( &$template ) {
 462                 ob_start();
 463                 $template->execute();
 464                 $this->addHTML( ob_get_contents() );
 465                 ob_end_clean();
 466         }
 467
 468         /**
 469          * Parse wikitext and return the HTML.
 470          *
 471          * @param string $text
 472          * @param bool   $linestart Is this the start of a line?
 473          * @param bool   $interface ??
 474          */
 475         public function parse( $text, $linestart = true, $interface = false ) {
 476                 global $wgParser, $wgTitle;
 477                 $popts = $this->parserOptions();
 478                 if ( $interface) { $popts->setInterfaceMessage(true); }
 479                 $parserOutput = $wgParser->parse( $text, $wgTitle, $popts,
 480                         $linestart, true, $this->mRevisionId );
 481                 if ( $interface) { $popts->setInterfaceMessage(false); }
 482                 return $parserOutput->getText();
 483         }
 484
 485         /**
 486          * @param Article $article
 487          * @param User    $user
 488          *
 489          * @return bool True if successful, else false.
 490          */
 491         public function tryParserCache( &$article, $user ) {
 492                 $parserCache =& ParserCache::singleton();
 493                 $parserOutput = $parserCache->get( $article, $user );
 494                 if ( $parserOutput !== false ) {
 495                         $this->addParserOutput( $parserOutput );
 496                         return true;
 497                 } else {
 498                         return false;
 499                 }
 500         }
 501
 502         /**
 503          * @param int $maxage Maximum cache time on the Squid, in seconds.
 504          */
 505         public function setSquidMaxage( $maxage ) {
 506                 $this->mSquidMaxage = $maxage;
 507         }
 508
 509         /**
 510          * Use enableClientCache(false) to force it to send nocache headers
 511          * @param $state ??
 512          */
 513         public function enableClientCache( $state ) {
 514                 return wfSetVar( $this->mEnableClientCache, $state );
 515         }
 516
 517         function uncacheableBecauseRequestvars() {
 518                 global $wgRequest;
 519                 return  $wgRequest->getText('useskin', false) === false
 520                         && $wgRequest->getText('uselang', false) === false;
 521         }
 522
 523         public function sendCacheControl() {
 524                 global $wgUseSquid, $wgUseESI, $wgUseETag, $wgSquidMaxage, $wgRequest;
 525                 $fname = 'OutputPage::sendCacheControl';
 526
 527                 if ($wgUseETag && $this->mETag)
 528                         $wgRequest->response()->header("ETag: $this->mETag");
 529
 530                 # don't serve compressed data to clients who can't handle it
 531                 # maintain different caches for logged-in users and non-logged in ones
 532                 $wgRequest->response()->header( 'Vary: Accept-Encoding, Cookie' );
 533                 if( !$this->uncacheableBecauseRequestvars() && $this->mEnableClientCache ) {
 534                         if( $wgUseSquid && session_id() == '' &&
 535                           ! $this->isPrintable() && $this->mSquidMaxage != 0 )
 536                         {
 537                                 if ( $wgUseESI ) {
 538                                         # We'll purge the proxy cache explicitly, but require end user agents
 539                                         # to revalidate against the proxy on each visit.
 540                                         # Surrogate-Control controls our Squid, Cache-Control downstream caches
 541                                         wfDebug( "$fname: proxy caching with ESI; {$this->mLastModified} **\n", false );
 542                                         # start with a shorter timeout for initial testing
 543                                         # header( 'Surrogate-Control: max-age=2678400+2678400, content="ESI/1.0"');
 544                                         $wgRequest->response()->header( 'Surrogate-Control: max-age='.$wgSquidMaxage.'+'.$this->mSquidMaxage.', content="ESI/1.0"');
 545                                         $wgRequest->response()->header( 'Cache-Control: s-maxage=0, must-revalidate, max-age=0' );
 546                                 } else {
 547                                         # We'll purge the proxy cache for anons explicitly, but require end user agents
 548                                         # to revalidate against the proxy on each visit.
 549                                         # IMPORTANT! The Squid needs to replace the Cache-Control header with
 550                                         # Cache-Control: s-maxage=0, must-revalidate, max-age=0
 551                                         wfDebug( "$fname: local proxy caching; {$this->mLastModified} **\n", false );
 552                                         # start with a shorter timeout for initial testing
 553                                         # header( "Cache-Control: s-maxage=2678400, must-revalidate, max-age=0" );
 554                                         $wgRequest->response()->header( 'Cache-Control: s-maxage='.$this->mSquidMaxage.', must-revalidate, max-age=0' );
 555                                 }
 556                         } else {
 557                                 # We do want clients to cache if they can, but they *must* check for updates
 558                                 # on revisiting the page.
 559                                 wfDebug( "$fname: private caching; {$this->mLastModified} **\n", false );
 560                                 $wgRequest->response()->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
 561                                 $wgRequest->response()->header( "Cache-Control: private, must-revalidate, max-age=0" );
 562                         }
 563                         if($this->mLastModified) $wgRequest->response()->header( "Last-modified: {$this->mLastModified}" );
 564                 } else {
 565                         wfDebug( "$fname: no caching **\n", false );
 566
 567                         # In general, the absence of a last modified header should be enough to prevent
 568                         # the client from using its cache. We send a few other things just to make sure.
 569                         $wgRequest->response()->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
 570                         $wgRequest->response()->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
 571                         $wgRequest->response()->header( 'Pragma: no-cache' );
 572                 }
 573         }
 574
 575         /**
 576          * Finally, all the text has been munged and accumulated into
 577          * the object, let's actually output it:
 578          */
 579         public function output() {
 580                 global $wgUser, $wgOutputEncoding, $wgRequest;
 581                 global $wgContLanguageCode, $wgDebugRedirects, $wgMimeType;
 582                 global $wgJsMimeType, $wgStylePath, $wgUseAjax, $wgAjaxSearch, $wgAjaxWatch;
 583                 global $wgServer, $wgStyleVersion;
 584
 585                 if( $this->mDoNothing ){
 586                         return;
 587                 }
 588                 $fname = 'OutputPage::output';
 589                 wfProfileIn( $fname );
 590                 $sk = $wgUser->getSkin();
 591
 592                 if ( $wgUseAjax ) {
 593                         $this->addScript( "<script type=\"{$wgJsMimeType}\" src=\"{$wgStylePath}/common/ajax.js?$wgStyleVersion\"></script>\n" );
 594
 595                         wfRunHooks( 'AjaxAddScript', array( &$this ) );
 596
 597                         if( $wgAjaxSearch ) {
 598                                 $this->addScript( "<script type=\"{$wgJsMimeType}\" src=\"{$wgStylePath}/common/ajaxsearch.js?$wgStyleVersion\"></script>\n" );
 599                                 $this->addScript( "<script type=\"{$wgJsMimeType}\">hookEvent(\"load\", sajax_onload);</script>\n" );
 600                         }
 601
 602                         if( $wgAjaxWatch && $wgUser->isLoggedIn() ) {
 603                                 $this->addScript( "<script type=\"{$wgJsMimeType}\" src=\"{$wgStylePath}/common/ajaxwatch.js?$wgStyleVersion\"></script>\n" );
 604                         }
 605                 }
 606
 607                 if ( '' != $this->mRedirect ) {
 608                         if( substr( $this->mRedirect, 0, 4 ) != 'http' ) {
 609                                 # Standards require redirect URLs to be absolute
 610                                 global $wgServer;
 611                                 $this->mRedirect = $wgServer . $this->mRedirect;
 612                         }
 613                         if( $this->mRedirectCode == '301') {
 614                                 if( !$wgDebugRedirects ) {
 615                                         $wgRequest->response()->header("HTTP/1.1 {$this->mRedirectCode} Moved Permanently");
 616                                 }
 617                                 $this->mLastModified = wfTimestamp( TS_RFC2822 );
 618                         }
 619
 620                         $this->sendCacheControl();
 621
 622                         $wgRequest->response()->header("Content-Type: text/html; charset=utf-8");
 623                         if( $wgDebugRedirects ) {
 624                                 $url = htmlspecialchars( $this->mRedirect );
 625                                 print "<html>\n<head>\n<title>Redirect</title>\n</head>\n<body>\n";
 626                                 print "<p>Location: <a href=\"$url\">$url</a></p>\n";
 627                                 print "</body>\n</html>\n";
 628                         } else {
 629                                 $wgRequest->response()->header( 'Location: '.$this->mRedirect );
 630                         }
 631                         wfProfileOut( $fname );
 632                         return;
 633                 }
 634                 elseif ( $this->mStatusCode )
 635                 {
 636                         $statusMessage = array(
 637                                 100 => 'Continue',
 638                                 101 => 'Switching Protocols',
 639                                 102 => 'Processing',
 640                                 200 => 'OK',
 641                                 201 => 'Created',
 642                                 202 => 'Accepted',
 643                                 203 => 'Non-Authoritative Information',
 644                                 204 => 'No Content',
 645                                 205 => 'Reset Content',
 646                                 206 => 'Partial Content',
 647                                 207 => 'Multi-Status',
 648                                 300 => 'Multiple Choices',
 649                                 301 => 'Moved Permanently',
 650                                 302 => 'Found',
 651                                 303 => 'See Other',
 652                                 304 => 'Not Modified',
 653                                 305 => 'Use Proxy',
 654                                 307 => 'Temporary Redirect',
 655                                 400 => 'Bad Request',
 656                                 401 => 'Unauthorized',
 657                                 402 => 'Payment Required',
 658                                 403 => 'Forbidden',
 659                                 404 => 'Not Found',
 660                                 405 => 'Method Not Allowed',
 661                                 406 => 'Not Acceptable',
 662                                 407 => 'Proxy Authentication Required',
 663                                 408 => 'Request Timeout',
 664                                 409 => 'Conflict',
 665                                 410 => 'Gone',
 666                                 411 => 'Length Required',
 667                                 412 => 'Precondition Failed',
 668                                 413 => 'Request Entity Too Large',
 669                                 414 => 'Request-URI Too Large',
 670                                 415 => 'Unsupported Media Type',
 671                                 416 => 'Request Range Not Satisfiable',
 672                                 417 => 'Expectation Failed',
 673                                 422 => 'Unprocessable Entity',
 674                                 423 => 'Locked',
 675                                 424 => 'Failed Dependency',
 676                                 500 => 'Internal Server Error',
 677                                 501 => 'Not Implemented',
 678                                 502 => 'Bad Gateway',
 679                                 503 => 'Service Unavailable',
 680                                 504 => 'Gateway Timeout',
 681                                 505 => 'HTTP Version Not Supported',
 682                                 507 => 'Insufficient Storage'
 683                         );
 684
 685                         if ( $statusMessage[$this->mStatusCode] )
 686                                 $wgRequest->response()->header( 'HTTP/1.1 ' . $this->mStatusCode . ' ' . $statusMessage[$this->mStatusCode] );
 687                 }
 688
 689                 # Buffer output; final headers may depend on later processing
 690                 ob_start();
 691
 692                 # Disable temporary placeholders, so that the skin produces HTML
 693                 $sk->postParseLinkColour( false );
 694
 695                 $wgRequest->response()->header( "Content-type: $wgMimeType; charset={$wgOutputEncoding}" );
 696                 $wgRequest->response()->header( 'Content-language: '.$wgContLanguageCode );
 697
 698                 if ($this->mArticleBodyOnly) {
 699                         $this->out($this->mBodytext);
 700                 } else {
 701                         wfProfileIn( 'Output-skin' );
 702                         $sk->outputPage( $this );
 703                         wfProfileOut( 'Output-skin' );
 704                 }
 705
 706                 $this->sendCacheControl();
 707                 ob_end_flush();
 708                 wfProfileOut( $fname );
 709         }
 710
 711         /**
 712          * @todo document
 713          * @param string $ins
 714          */
 715         public function out( $ins ) {
 716                 global $wgInputEncoding, $wgOutputEncoding, $wgContLang;
 717                 if ( 0 == strcmp( $wgInputEncoding, $wgOutputEncoding ) ) {
 718                         $outs = $ins;
 719                 } else {
 720                         $outs = $wgContLang->iconv( $wgInputEncoding, $wgOutputEncoding, $ins );
 721                         if ( false === $outs ) { $outs = $ins; }
 722                 }
 723                 print $outs;
 724         }
 725
 726         /**
 727          * @todo document
 728          */
 729         public static function setEncodings() {
 730                 global $wgInputEncoding, $wgOutputEncoding;
 731                 global $wgUser, $wgContLang;
 732
 733                 $wgInputEncoding = strtolower( $wgInputEncoding );
 734
 735                 if ( empty( $_SERVER['HTTP_ACCEPT_CHARSET'] ) ) {
 736                         $wgOutputEncoding = strtolower( $wgOutputEncoding );
 737                         return;
 738                 }
 739                 $wgOutputEncoding = $wgInputEncoding;
 740         }
 741
 742         /**
 743          * Deprecated, use wfReportTime() instead.
 744          * @return string
 745          * @deprecated
 746          */
 747         public function reportTime() {
 748                 $time = wfReportTime();
 749                 return $time;
 750         }
 751
 752         /**
 753          * Produce a "user is blocked" page.
 754          *
 755          * @param bool $return Whether to have a "return to $wgTitle" message or not.
 756          * @return nothing
 757          */
 758         function blockedPage( $return = true ) {
 759                 global $wgUser, $wgContLang, $wgTitle, $wgLang;
 760
 761                 $this->setPageTitle( wfMsg( 'blockedtitle' ) );
 762                 $this->setRobotpolicy( 'noindex,nofollow' );
 763                 $this->setArticleRelated( false );
 764
 765                 $name = User::whoIs( $wgUser->blockedBy() );
 766                 $reason = $wgUser->blockedFor();
 767                 if( $reason == '' ) {
 768                         $reason = wfMsg( 'blockednoreason' );
 769                 }
 770                 $blockTimestamp = $wgLang->timeanddate( wfTimestamp( TS_MW, $wgUser->mBlock->mTimestamp ), true );
 771                 $ip = wfGetIP();
 772
 773                 $link = '[[' . $wgContLang->getNsText( NS_USER ) . ":{$name}|{$name}]]";
 774
 775                 $blockid = $wgUser->mBlock->mId;
 776
 777                 $blockExpiry = $wgUser->mBlock->mExpiry;
 778                 if ( $blockExpiry == 'infinity' ) {
 779                         // Entry in database (table ipblocks) is 'infinity' but 'ipboptions' uses 'infinite' or 'indefinite'
 780                         // Search for localization in 'ipboptions'
 781                         $scBlockExpiryOptions = wfMsg( 'ipboptions' );
 782                         foreach ( explode( ',', $scBlockExpiryOptions ) as $option ) {
 783                                 if ( strpos( $option, ":" ) === false )
 784                                         continue;
 785                                 list( $show, $value ) = explode( ":", $option );
 786                                 if ( $value == 'infinite' || $value == 'indefinite' ) {
 787                                         $blockExpiry = $show;
 788                                         break;
 789                                 }
 790                         }
 791                 } else {
 792                         $blockExpiry = $wgLang->timeanddate( wfTimestamp( TS_MW, $blockExpiry ), true );
 793                 }
 794
 795                 if ( $wgUser->mBlock->mAuto ) {
 796                         $msg = 'autoblockedtext';
 797                 } else {
 798                         $msg = 'blockedtext';
 799                 }
 800
 801                 /* $ip returns who *is* being blocked, $intended contains who was meant to be blocked.
 802                  * This could be a username, an ip range, or a single ip. */
 803                 $intended = $wgUser->mBlock->mAddress;
 804
 805                 $this->addWikiText( wfMsg( $msg, $link, $reason, $ip, $name, $blockid, $blockExpiry, $intended, $blockTimestamp ) );
 806
 807                 # Don't auto-return to special pages
 808                 if( $return ) {
 809                         $return = $wgTitle->getNamespace() > -1 ? $wgTitle->getPrefixedText() : NULL;
 810                         $this->returnToMain( false, $return );
 811                 }
 812         }
 813
 814         /**
 815          * Output a standard error page
 816          *
 817          * @param string $title Message key for page title
 818          * @param string $msg Message key for page text
 819          * @param array $params Message parameters
 820          */
 821         public function showErrorPage( $title, $msg, $params = array() ) {
 822                 global $wgTitle;
 823
 824                 $this->mDebugtext .= 'Original title: ' .
 825                   $wgTitle->getPrefixedText() . "\n";
 826                 $this->setPageTitle( wfMsg( $title ) );
 827                 $this->setHTMLTitle( wfMsg( 'errorpagetitle' ) );
 828                 $this->setRobotpolicy( 'noindex,nofollow' );
 829                 $this->setArticleRelated( false );
 830                 $this->enableClientCache( false );
 831                 $this->mRedirect = '';
 832                 $this->mBodytext = '';
 833
 834                 array_unshift( $params, 'parse' );
 835                 array_unshift( $params, $msg );
 836                 $this->addHtml( call_user_func_array( 'wfMsgExt', $params ) );
 837
 838                 $this->returnToMain( false );
 839         }
 840
 841         /**
 842          * Output a standard permission error page
 843          *
 844          * @param array $errors Error message keys
 845          */
 846         public function showPermissionsErrorPage( $errors )
 847         {
 848                 global $wgTitle;
 849
 850                 $this->mDebugtext .= 'Original title: ' .
 851                          $wgTitle->getPrefixedText() . "\n";
 852                 $this->setPageTitle( wfMsg( 'permissionserrors' ) );
 853                 $this->setHTMLTitle( wfMsg( 'permissionserrors' ) );
 854                 $this->setRobotpolicy( 'noindex,nofollow' );
 855                 $this->setArticleRelated( false );
 856                 $this->enableClientCache( false );
 857                 $this->mRedirect = '';
 858                 $this->mBodytext = '';
 859                 $this->addWikiText( $this->formatPermissionsErrorMessage( $errors ) );
 860         }
 861
 862         /** @deprecated */
 863         public function errorpage( $title, $msg ) {
 864                 throw new ErrorPageError( $title, $msg );
 865         }
 866
 867         /**
 868          * Display an error page indicating that a given version of MediaWiki is
 869          * required to use it
 870          *
 871          * @param mixed $version The version of MediaWiki needed to use the page
 872          */
 873         public function versionRequired( $version ) {
 874                 $this->setPageTitle( wfMsg( 'versionrequired', $version ) );
 875                 $this->setHTMLTitle( wfMsg( 'versionrequired', $version ) );
 876                 $this->setRobotpolicy( 'noindex,nofollow' );
 877                 $this->setArticleRelated( false );
 878                 $this->mBodytext = '';
 879
 880                 $this->addWikiText( wfMsg( 'versionrequiredtext', $version ) );
 881                 $this->returnToMain();
 882         }
 883
 884         /**
 885          * Display an error page noting that a given permission bit is required.
 886          *
 887          * @param string $permission key required
 888          */
 889         public function permissionRequired( $permission ) {
 890                 global $wgGroupPermissions, $wgUser;
 891
 892                 $this->setPageTitle( wfMsg( 'badaccess' ) );
 893                 $this->setHTMLTitle( wfMsg( 'errorpagetitle' ) );
 894                 $this->setRobotpolicy( 'noindex,nofollow' );
 895                 $this->setArticleRelated( false );
 896                 $this->mBodytext = '';
 897
 898                 $groups = array();
 899                 foreach( $wgGroupPermissions as $key => $value ) {
 900                         if( isset( $value[$permission] ) && $value[$permission] == true ) {
 901                                 $groupName = User::getGroupName( $key );
 902                                 $groupPage = User::getGroupPage( $key );
 903                                 if( $groupPage ) {
 904                                         $skin = $wgUser->getSkin();
 905                                         $groups[] = $skin->makeLinkObj( $groupPage, $groupName );
 906                                 } else {
 907                                         $groups[] = $groupName;
 908                                 }
 909                         }
 910                 }
 911                 $n = count( $groups );
 912                 $groups = implode( ', ', $groups );
 913                 switch( $n ) {
 914                         case 0:
 915                         case 1:
 916                         case 2:
 917                                 $message = wfMsgHtml( "badaccess-group$n", $groups );
 918                                 break;
 919                         default:
 920                                 $message = wfMsgHtml( 'badaccess-groups', $groups );
 921                 }
 922                 $this->addHtml( $message );
 923                 $this->returnToMain( false );
 924         }
 925
 926         /**
 927          * Use permissionRequired.
 928          * @deprecated
 929          */
 930         public function sysopRequired() {
 931                 throw new MWException( "Call to deprecated OutputPage::sysopRequired() method\n" );
 932         }
 933
 934         /**
 935          * Use permissionRequired.
 936          * @deprecated
 937          */
 938         public function developerRequired() {
 939                 throw new MWException( "Call to deprecated OutputPage::developerRequired() method\n" );
 940         }
 941
 942         /**
 943          * Produce the stock "please login to use the wiki" page
 944          */
 945         public function loginToUse() {
 946                 global $wgUser, $wgTitle, $wgContLang;
 947
 948                 if( $wgUser->isLoggedIn() ) {
 949                         $this->permissionRequired( 'read' );
 950                         return;
 951                 }
 952
 953                 $skin = $wgUser->getSkin();
 954
 955                 $this->setPageTitle( wfMsg( 'loginreqtitle' ) );
 956                 $this->setHtmlTitle( wfMsg( 'errorpagetitle' ) );
 957                 $this->setRobotPolicy( 'noindex,nofollow' );
 958                 $this->setArticleFlag( false );
 959
 960                 $loginTitle = SpecialPage::getTitleFor( 'Userlogin' );
 961                 $loginLink = $skin->makeKnownLinkObj( $loginTitle, wfMsgHtml( 'loginreqlink' ), 'returnto=' . $wgTitle->getPrefixedUrl() );
 962                 $this->addHtml( wfMsgWikiHtml( 'loginreqpagetext', $loginLink ) );
 963                 $this->addHtml( "\n<!--" . $wgTitle->getPrefixedUrl() . "-->" );
 964
 965                 # Don't return to the main page if the user can't read it
 966                 # otherwise we'll end up in a pointless loop
 967                 $mainPage = Title::newMainPage();
 968                 if( $mainPage->userCanRead() )
 969                         $this->returnToMain( true, $mainPage );
 970         }
 971
 972         /** @deprecated */
 973         public function databaseError( $fname, $sql, $error, $errno ) {
 974                 throw new MWException( "OutputPage::databaseError is obsolete\n" );
 975         }
 976
 977         /**
 978          * @param array $errors An array of arrays returned by Title::getUserPermissionsErrors
 979          * @return string The error-messages, formatted into a list.
 980          */
 981         public function formatPermissionsErrorMessage( $errors ) {
 982                 $text = '';
 983
 984                 if (sizeof( $errors ) > 1) {
 985
 986                         $text .= wfMsgExt( 'permissionserrorstext', array( 'parse' ), count( $errors ) ) . "\n";
 987                         $text .= '<ul class="permissions-errors">' . "\n";
 988
 989                         foreach( $errors as $error )
 990                         {
 991                                 $text .= '<li>';
 992                                 $text .= call_user_func_array( 'wfMsg', $error );
 993                                 $text .= "</li>\n";
 994                         }
 995                         $text .= '</ul>';
 996                 } else {
 997                         $text .= call_user_func_array( 'wfMsg', $errors[0]);
 998                 }
 999
1000                 return $text;
1001         }
1002
1003         /**
1004          * @todo document
1005          * @param bool  $protected Is the reason the page can't be reached because it's protected?
1006          * @param mixed $source
1007          * @param bool $protected, page is protected?
1008          * @param array $reason, array of arrays( msg, args )
1009          */
1010         public function readOnlyPage( $source = null, $protected = false, $reasons = array() ) {
1011                 global $wgUser, $wgReadOnlyFile, $wgReadOnly, $wgTitle;
1012                 $skin = $wgUser->getSkin();
1013
1014                 $this->setRobotpolicy( 'noindex,nofollow' );
1015                 $this->setArticleRelated( false );
1016
1017                 if ( !empty($reasons) ) {
1018                         $this->setPageTitle( wfMsg( 'viewsource' ) );
1019                         $this->setSubtitle( wfMsg( 'viewsourcefor', $skin->makeKnownLinkObj( $wgTitle ) ) );
1020
1021                         $this->addWikiText( $this->formatPermissionsErrorMessage( $reasons ) );
1022                 } else if( $protected ) {
1023                         $this->setPageTitle( wfMsg( 'viewsource' ) );
1024                         $this->setSubtitle( wfMsg( 'viewsourcefor', $skin->makeKnownLinkObj( $wgTitle ) ) );
1025                         list( $cascadeSources, /* $restrictions */ ) = $wgTitle->getCascadeProtectionSources();
1026
1027                         // Show an appropriate explanation depending upon the reason
1028                         // for the protection...all of these should be moved to the
1029                         // callers
1030                         if( $wgTitle->getNamespace() == NS_MEDIAWIKI ) {
1031                                 // User isn't allowed to edit the interface
1032                                 $this->addWikiText( wfMsg( 'protectedinterface' ) );
1033                         } elseif( $cascadeSources && ( $count = count( $cascadeSources ) ) > 0 ) {
1034                                 // Cascading protection
1035                                         $titles = '';
1036                                         foreach( $cascadeSources as $title )
1037                                                 $titles .= "* [[:" . $title->getPrefixedText()  . "]]\n";
1038                                         $this->addWikiText( wfMsgExt( 'cascadeprotected', 'parsemag', $count, "\n{$titles}" ) );
1039                         } elseif( !$wgTitle->isProtected( 'edit' ) && $wgTitle->isNamespaceProtected() ) {
1040                                 // Namespace protection
1041                                 $ns = $wgTitle->getNamespace() == NS_MAIN
1042                                         ? wfMsg( 'nstab-main' )
1043                                         : $wgTitle->getNsText();
1044                                 $this->addWikiText( wfMsg( 'namespaceprotected', $ns ) );
1045                         } else {
1046                                 // Standard protection
1047                                 $this->addWikiText( wfMsg( 'protectedpagetext' ) );
1048                         }
1049                 } else {
1050                         $this->setPageTitle( wfMsg( 'readonly' ) );
1051                         if ( $wgReadOnly ) {
1052                                 $reason = $wgReadOnly;
1053                         } else {
1054                                 $reason = file_get_contents( $wgReadOnlyFile );
1055                         }
1056                         $this->addWikiText( wfMsg( 'readonlytext', $reason ) );
1057                 }
1058
1059                 if( is_string( $source ) ) {
1060                         $this->addWikiText( wfMsg( 'viewsourcetext' ) );
1061                         $rows = $wgUser->getIntOption( 'rows' );
1062                         $cols = $wgUser->getIntOption( 'cols' );
1063                         $text = "\n<textarea name='wpTextbox1' id='wpTextbox1' cols='$cols' rows='$rows' readonly='readonly'>" .
1064                                 htmlspecialchars( $source ) . "\n</textarea>";
1065                         $this->addHTML( $text );
1066                 }
1067                 $article = new Article( $wgTitle );
1068                 $this->addHTML( $skin->formatTemplates( $article->getUsedTemplates() ) );
1069
1070                 $this->returnToMain( false, $wgTitle );
1071         }
1072
1073         /** @deprecated */
1074         public function fatalError( $message ) {
1075                 throw new FatalError( $message );
1076         }
1077
1078         /** @deprecated */
1079         public function unexpectedValueError( $name, $val ) {
1080                 throw new FatalError( wfMsg( 'unexpected', $name, $val ) );
1081         }
1082
1083         /** @deprecated */
1084         public function fileCopyError( $old, $new ) {
1085                 throw new FatalError( wfMsg( 'filecopyerror', $old, $new ) );
1086         }
1087
1088         /** @deprecated */
1089         public function fileRenameError( $old, $new ) {
1090                 throw new FatalError( wfMsg( 'filerenameerror', $old, $new ) );
1091         }
1092
1093         /** @deprecated */
1094         public function fileDeleteError( $name ) {
1095                 throw new FatalError( wfMsg( 'filedeleteerror', $name ) );
1096         }
1097
1098         /** @deprecated */
1099         public function fileNotFoundError( $name ) {
1100                 throw new FatalError( wfMsg( 'filenotfound', $name ) );
1101         }
1102
1103         public function showFatalError( $message ) {
1104                 $this->setPageTitle( wfMsg( "internalerror" ) );
1105                 $this->setRobotpolicy( "noindex,nofollow" );
1106                 $this->setArticleRelated( false );
1107                 $this->enableClientCache( false );
1108                 $this->mRedirect = '';
1109                 $this->mBodytext = $message;
1110         }
1111
1112         public function showUnexpectedValueError( $name, $val ) {
1113                 $this->showFatalError( wfMsg( 'unexpected', $name, $val ) );
1114         }
1115
1116         public function showFileCopyError( $old, $new ) {
1117                 $this->showFatalError( wfMsg( 'filecopyerror', $old, $new ) );
1118         }
1119
1120         public function showFileRenameError( $old, $new ) {
1121                 $this->showFatalError( wfMsg( 'filerenameerror', $old, $new ) );
1122         }
1123
1124         public function showFileDeleteError( $name ) {
1125                 $this->showFatalError( wfMsg( 'filedeleteerror', $name ) );
1126         }
1127
1128         public function showFileNotFoundError( $name ) {
1129                 $this->showFatalError( wfMsg( 'filenotfound', $name ) );
1130         }
1131
1132         /**
1133          * Add a "return to" link pointing to a specified title
1134          *
1135          * @param Title $title Title to link
1136          */
1137         public function addReturnTo( $title ) {
1138                 global $wgUser;
1139                 $link = wfMsg( 'returnto', $wgUser->getSkin()->makeLinkObj( $title ) );
1140                 $this->addHtml( "<p>{$link}</p>\n" );
1141         }
1142
1143         /**
1144          * Add a "return to" link pointing to a specified title,
1145          * or the title indicated in the request, or else the main page
1146          *
1147          * @param null $unused No longer used
1148          * @param Title $returnto Title to return to
1149          */
1150         public function returnToMain( $unused = null, $returnto = NULL ) {
1151                 global $wgRequest;
1152
1153                 if ( $returnto == NULL ) {
1154                         $returnto = $wgRequest->getText( 'returnto' );
1155                 }
1156
1157                 if ( '' === $returnto ) {
1158                         $returnto = Title::newMainPage();
1159                 }
1160
1161                 if ( is_object( $returnto ) ) {
1162                         $titleObj = $returnto;
1163                 } else {
1164                         $titleObj = Title::newFromText( $returnto );
1165                 }
1166                 if ( !is_object( $titleObj ) ) {
1167                         $titleObj = Title::newMainPage();
1168                 }
1169
1170                 $this->addReturnTo( $titleObj );
1171         }
1172
1173         /**
1174          * This function takes the title (first item of mGoodLinks), categories, existing and broken links for the page
1175          * and uses the first 10 of them for META keywords
1176          *
1177          * @param ParserOutput &$parserOutput
1178          */
1179         private function addKeywords( &$parserOutput ) {
1180                 global $wgTitle;
1181                 $this->addKeyword( $wgTitle->getPrefixedText() );
1182                 $count = 1;
1183                 $links2d =& $parserOutput->getLinks();
1184                 if ( !is_array( $links2d ) ) {
1185                         return;
1186                 }
1187                 foreach ( $links2d as $dbkeys ) {
1188                         foreach( $dbkeys as $dbkey => $unused ) {
1189                                 $this->addKeyword( $dbkey );
1190                                 if ( ++$count > 10 ) {
1191                                         break 2;
1192                                 }
1193                         }
1194                 }
1195         }
1196
1197         /**
1198          * @return string The doctype, opening <html>, and head element.
1199          */
1200         public function headElement() {
1201                 global $wgDocType, $wgDTD, $wgContLanguageCode, $wgOutputEncoding, $wgMimeType;
1202                 global $wgXhtmlDefaultNamespace, $wgXhtmlNamespaces;
1203                 global $wgUser, $wgContLang, $wgUseTrackbacks, $wgTitle, $wgStyleVersion;
1204
1205                 if( $wgMimeType == 'text/xml' || $wgMimeType == 'application/xhtml+xml' || $wgMimeType == 'application/xml' ) {
1206                         $ret = "<?xml version=\"1.0\" encoding=\"$wgOutputEncoding\" ?>\n";
1207                 } else {
1208                         $ret = '';
1209                 }
1210
1211                 $ret .= "<!DOCTYPE html PUBLIC \"$wgDocType\"\n        \"$wgDTD\">\n";
1212
1213                 if ( '' == $this->getHTMLTitle() ) {
1214                         $this->setHTMLTitle(  wfMsg( 'pagetitle', $this->getPageTitle() ));
1215                 }
1216
1217                 $rtl = $wgContLang->isRTL() ? " dir='RTL'" : '';
1218                 $ret .= "<html xmlns=\"{$wgXhtmlDefaultNamespace}\" ";
1219                 foreach($wgXhtmlNamespaces as $tag => $ns) {
1220                         $ret .= "xmlns:{$tag}=\"{$ns}\" ";
1221                 }
1222                 $ret .= "xml:lang=\"$wgContLanguageCode\" lang=\"$wgContLanguageCode\" $rtl>\n";
1223                 $ret .= "<head>\n<title>" . htmlspecialchars( $this->getHTMLTitle() ) . "</title>\n";
1224                 array_push( $this->mMetatags, array( "http:Content-type", "$wgMimeType; charset={$wgOutputEncoding}" ) );
1225
1226                 $ret .= $this->getHeadLinks();
1227                 global $wgStylePath;
1228                 if( $this->isPrintable() ) {
1229                         $media = '';
1230                 } else {
1231                         $media = "media='print'";
1232                 }
1233                 $printsheet = htmlspecialchars( "$wgStylePath/common/wikiprintable.css?$wgStyleVersion" );
1234                 $ret .= "<link rel='stylesheet' type='text/css' $media href='$printsheet' />\n";
1235
1236                 $sk = $wgUser->getSkin();
1237                 $ret .= $sk->getHeadScripts( $this->mAllowUserJs );
1238                 $ret .= $this->mScripts;
1239                 $ret .= $sk->getUserStyles();
1240                 $ret .= $this->getHeadItems();
1241
1242                 if ($wgUseTrackbacks && $this->isArticleRelated())
1243                         $ret .= $wgTitle->trackbackRDF();
1244
1245                 $ret .= "</head>\n";
1246                 return $ret;
1247         }
1248
1249         /**
1250          * @return string HTML tag links to be put in the header.
1251          */
1252         public function getHeadLinks() {
1253                 global $wgRequest;
1254                 $ret = '';
1255                 foreach ( $this->mMetatags as $tag ) {
1256                         if ( 0 == strcasecmp( 'http:', substr( $tag[0], 0, 5 ) ) ) {
1257                                 $a = 'http-equiv';
1258                                 $tag[0] = substr( $tag[0], 5 );
1259                         } else {
1260                                 $a = 'name';
1261                         }
1262                         $ret .= "<meta $a=\"{$tag[0]}\" content=\"{$tag[1]}\" />\n";
1263                 }
1264
1265                 $p = $this->mRobotpolicy;
1266                 if( $p !== '' && $p != 'index,follow' ) {
1267                         // http://www.robotstxt.org/wc/meta-user.html
1268                         // Only show if it's different from the default robots policy
1269                         $ret .= "<meta name=\"robots\" content=\"$p\" />\n";
1270                 }
1271
1272                 if ( count( $this->mKeywords ) > 0 ) {
1273                         $strip = array(
1274                                 "/<.*?>/" => '',
1275                                 "/_/" => ' '
1276                         );
1277                         $ret .= "\t\t<meta name=\"keywords\" content=\"" .
1278                           htmlspecialchars(preg_replace(array_keys($strip), array_values($strip),implode( ",", $this->mKeywords ))) . "\" />\n";
1279                 }
1280                 foreach ( $this->mLinktags as $tag ) {
1281                         $ret .= "\t\t<link";
1282                         foreach( $tag as $attr => $val ) {
1283                                 $ret .= " $attr=\"" . htmlspecialchars( $val ) . "\"";
1284                         }
1285                         $ret .= " />\n";
1286                 }
1287
1288                 if( $this->isSyndicated() ) {
1289                         # FIXME: centralize the mime-type and name information in Feed.php
1290                         # Use the page name for the title (accessed through $wgTitle since
1291                         # there's no other way).  In principle, this could lead to issues
1292                         # with having the same name for different feeds corresponding to
1293                         # the same page, but we can't avoid that at this low a level.
1294                         global $wgTitle;
1295                         $ret .= $this->feedLink(
1296                                 'rss',
1297                                 $wgRequest->appendQuery( 'feed=rss' ),
1298                                 wfMsg( 'page-rss-feed', $wgTitle->getPrefixedText() ) );
1299                         $ret .= $this->feedLink(
1300                                 'atom',
1301                                 $wgRequest->appendQuery( 'feed=atom' ),
1302                                 wfMsg( 'page-atom-feed', $wgTitle->getPrefixedText() ) );
1303                 }
1304
1305                 # Recent changes feed should appear on every page
1306                 # Put it after the per-page feed to avoid changing existing behavior.
1307                 # It's still available, probably via a menu in your browser.
1308                 global $wgSitename;
1309                 $rctitle = SpecialPage::getTitleFor( 'Recentchanges' );
1310                 $ret .= $this->feedLink(
1311                         'rss',
1312                         $rctitle->getFullURL( 'feed=rss' ),
1313                         wfMsg( 'site-rss-feed', $wgSitename ) );
1314                 $ret .= $this->feedLink(
1315                         'atom',
1316                         $rctitle->getFullURL( 'feed=atom' ),
1317                         wfMsg( 'site-atom-feed', $wgSitename ) );
1318
1319                 return $ret;
1320         }
1321
1322         /**
1323          * Generate a <link rel/> for an RSS feed.
1324          */
1325         private function feedLink( $type, $url, $text ) {
1326                 return Xml::element( 'link', array(
1327                         'rel' => 'alternate',
1328                         'type' => "application/$type+xml",
1329                         'title' => $text,
1330                         'href' => $url ) ) . "\n";
1331         }
1332
1333         /**
1334          * Turn off regular page output and return an error reponse
1335          * for when rate limiting has triggered.
1336          * @todo i18n
1337          */
1338         public function rateLimited() {
1339                 global $wgOut;
1340                 $wgOut->disable();
1341                 wfHttpError( 500, 'Internal Server Error',
1342                         'Sorry, the server has encountered an internal error. ' .
1343                         'Please wait a moment and hit "refresh" to submit the request again.' );
1344         }
1345
1346         /**
1347          * Show an "add new section" link?
1348          *
1349          * @return bool
1350          */
1351         public function showNewSectionLink() {
1352                 return $this->mNewSectionLink;
1353         }
1354
1355         /**
1356          * Show a warning about slave lag
1357          *
1358          * If the lag is higher than $wgSlaveLagCritical seconds,
1359          * then the warning is a bit more obvious. If the lag is
1360          * lower than $wgSlaveLagWarning, then no warning is shown.
1361          *
1362          * @param int $lag Slave lag
1363          */
1364         public function showLagWarning( $lag ) {
1365                 global $wgSlaveLagWarning, $wgSlaveLagCritical;
1366                 if( $lag >= $wgSlaveLagWarning ) {
1367                         $message = $lag < $wgSlaveLagCritical
1368                                 ? 'lag-warn-normal'
1369                                 : 'lag-warn-high';
1370                         $warning = wfMsgExt( $message, 'parse', $lag );
1371                         $this->addHtml( "<div class=\"mw-{$message}\">\n{$warning}\n</div>\n" );
1372                 }
1373         }
1374
1375 }