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