includes/OutputPage.php

   1 <?php
   2 if ( ! defined( 'MEDIAWIKI' ) )
   3         die( 1 );
   4 /**
   5  * @package MediaWiki
   6  */
   7
   8 /**
   9  * @todo document
  10  * @package MediaWiki
  11  */
  12 class OutputPage {
  13         var $mMetatags, $mKeywords;
  14         var $mLinktags, $mPagetitle, $mBodytext, $mDebugtext;
  15         var $mHTMLtitle, $mRobotpolicy, $mIsarticle, $mPrintable;
  16         var $mSubtitle, $mRedirect, $mStatusCode;
  17         var $mLastModified, $mETag, $mCategoryLinks;
  18         var $mScripts, $mLinkColours, $mPageLinkTitle;
  19
  20         var $mSuppressQuickbar;
  21         var $mOnloadHandler;
  22         var $mDoNothing;
  23         var $mContainsOldMagic, $mContainsNewMagic;
  24         var $mIsArticleRelated;
  25         var $mParserOptions;
  26         var $mShowFeedLinks = false;
  27         var $mEnableClientCache = true;
  28         var $mArticleBodyOnly = false;
  29
  30         var $mNewSectionLink = false;
  31         var $mNoGallery = false;
  32
  33         /**
  34          * Constructor
  35          * Initialise private variables
  36          */
  37         function OutputPage() {
  38                 $this->mMetatags = $this->mKeywords = $this->mLinktags = array();
  39                 $this->mHTMLtitle = $this->mPagetitle = $this->mBodytext =
  40                 $this->mRedirect = $this->mLastModified =
  41                 $this->mSubtitle = $this->mDebugtext = $this->mRobotpolicy =
  42                 $this->mOnloadHandler = $this->mPageLinkTitle = '';
  43                 $this->mIsArticleRelated = $this->mIsarticle = $this->mPrintable = true;
  44                 $this->mSuppressQuickbar = $this->mPrintable = false;
  45                 $this->mLanguageLinks = array();
  46                 $this->mCategoryLinks = array();
  47                 $this->mDoNothing = false;
  48                 $this->mContainsOldMagic = $this->mContainsNewMagic = 0;
  49                 $this->mParserOptions = ParserOptions::newFromUser( NULL );
  50                 $this->mSquidMaxage = 0;
  51                 $this->mScripts = '';
  52                 $this->mETag = false;
  53                 $this->mRevisionId = null;
  54                 $this->mNewSectionLink = false;
  55         }
  56
  57         function redirect( $url, $responsecode = '302' ) {
  58                 # Strip newlines as a paranoia check for header injection in PHP<5.1.2
  59                 $this->mRedirect = str_replace( "\n", '', $url );
  60                 $this->mRedirectCode = $responsecode;
  61         }
  62
  63         function setStatusCode( $statusCode ) { $this->mStatusCode = $statusCode; }
  64
  65         # To add an http-equiv meta tag, precede the name with "http:"
  66         function addMeta( $name, $val ) { array_push( $this->mMetatags, array( $name, $val ) ); }
  67         function addKeyword( $text ) { array_push( $this->mKeywords, $text ); }
  68         function addScript( $script ) { $this->mScripts .= $script; }
  69         function getScript() { return $this->mScripts; }
  70
  71         function setETag($tag) { $this->mETag = $tag; }
  72         function setArticleBodyOnly($only) { $this->mArticleBodyOnly = $only; }
  73         function getArticleBodyOnly($only) { return $this->mArticleBodyOnly; }
  74
  75         function addLink( $linkarr ) {
  76                 # $linkarr should be an associative array of attributes. We'll escape on output.
  77                 array_push( $this->mLinktags, $linkarr );
  78         }
  79
  80         function addMetadataLink( $linkarr ) {
  81                 # note: buggy CC software only reads first "meta" link
  82                 static $haveMeta = false;
  83                 $linkarr['rel'] = ($haveMeta) ? 'alternate meta' : 'meta';
  84                 $this->addLink( $linkarr );
  85                 $haveMeta = true;
  86         }
  87
  88         /**
  89          * checkLastModified tells the client to use the client-cached page if
  90          * possible. If sucessful, the OutputPage is disabled so that
  91          * any future call to OutputPage->output() have no effect. The method
  92          * returns true iff cache-ok headers was sent.
  93          */
  94         function checkLastModified ( $timestamp ) {
  95                 global $wgCachePages, $wgCacheEpoch, $wgUser;
  96                 $fname = 'OutputPage::checkLastModified';
  97
  98                 if ( !$timestamp || $timestamp == '19700101000000' ) {
  99                         wfDebug( "$fname: CACHE DISABLED, NO TIMESTAMP\n" );
 100                         return;
 101                 }
 102                 if( !$wgCachePages ) {
 103                         wfDebug( "$fname: CACHE DISABLED\n", false );
 104                         return;
 105                 }
 106                 if( $wgUser->getOption( 'nocache' ) ) {
 107                         wfDebug( "$fname: USER DISABLED CACHE\n", false );
 108                         return;
 109                 }
 110
 111                 $timestamp=wfTimestamp(TS_MW,$timestamp);
 112                 $lastmod = wfTimestamp( TS_RFC2822, max( $timestamp, $wgUser->mTouched, $wgCacheEpoch ) );
 113
 114                 if( !empty( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) ) {
 115                         # IE sends sizes after the date like this:
 116                         # Wed, 20 Aug 2003 06:51:19 GMT; length=5202
 117                         # this breaks strtotime().
 118                         $modsince = preg_replace( '/;.*$/', '', $_SERVER["HTTP_IF_MODIFIED_SINCE"] );
 119                         $modsinceTime = strtotime( $modsince );
 120                         $ismodsince = wfTimestamp( TS_MW, $modsinceTime ? $modsinceTime : 1 );
 121                         wfDebug( "$fname: -- client send If-Modified-Since: " . $modsince . "\n", false );
 122                         wfDebug( "$fname: --  we might send Last-Modified : $lastmod\n", false );
 123                         if( ($ismodsince >= $timestamp ) && $wgUser->validateCache( $ismodsince ) && $ismodsince >= $wgCacheEpoch ) {
 124                                 # Make sure you're in a place you can leave when you call us!
 125                                 header( "HTTP/1.0 304 Not Modified" );
 126                                 $this->mLastModified = $lastmod;
 127                                 $this->sendCacheControl();
 128                                 wfDebug( "$fname: CACHED client: $ismodsince ; user: $wgUser->mTouched ; page: $timestamp ; site $wgCacheEpoch\n", false );
 129                                 $this->disable();
 130                                 @ob_end_clean(); // Don't output compressed blob
 131                                 return true;
 132                         } else {
 133                                 wfDebug( "$fname: READY  client: $ismodsince ; user: $wgUser->mTouched ; page: $timestamp ; site $wgCacheEpoch\n", false );
 134                                 $this->mLastModified = $lastmod;
 135                         }
 136                 } else {
 137                         wfDebug( "$fname: client did not send If-Modified-Since header\n", false );
 138                         $this->mLastModified = $lastmod;
 139                 }
 140         }
 141
 142         function getPageTitleActionText () {
 143                 global $action;
 144                 switch($action) {
 145                         case 'edit':
 146                         case 'delete':
 147                         case 'protect':
 148                         case 'unprotect':
 149                         case 'watch':
 150                         case 'unwatch':
 151                                 // Display title is already customized
 152                                 return '';
 153                         case 'history':
 154                                 return wfMsg('history_short');
 155                         case 'submit':
 156                                 // FIXME: bug 2735; not correct for special pages etc
 157                                 return wfMsg('preview');
 158                         case 'info':
 159                                 return wfMsg('info_short');
 160                         default:
 161                                 return '';
 162                 }
 163         }
 164
 165         function setRobotpolicy( $str ) { $this->mRobotpolicy = $str; }
 166         function setHTMLTitle( $name ) {$this->mHTMLtitle = $name; }
 167         function setPageTitle( $name ) {
 168                 global $action, $wgContLang;
 169                 $name = $wgContLang->convert($name, true);
 170                 $this->mPagetitle = $name;
 171                 if(!empty($action)) {
 172                         $taction =  $this->getPageTitleActionText();
 173                         if( !empty( $taction ) ) {
 174                                 $name .= ' - '.$taction;
 175                         }
 176                 }
 177
 178                 $this->setHTMLTitle( wfMsg( 'pagetitle', $name ) );
 179         }
 180         function getHTMLTitle() { return $this->mHTMLtitle; }
 181         function getPageTitle() { return $this->mPagetitle; }
 182         function setSubtitle( $str ) { $this->mSubtitle = /*$this->parse(*/$str/*)*/; } // @bug 2514
 183         function getSubtitle() { return $this->mSubtitle; }
 184         function isArticle() { return $this->mIsarticle; }
 185         function setPrintable() { $this->mPrintable = true; }
 186         function isPrintable() { return $this->mPrintable; }
 187         function setSyndicated( $show = true ) { $this->mShowFeedLinks = $show; }
 188         function isSyndicated() { return $this->mShowFeedLinks; }
 189         function setOnloadHandler( $js ) { $this->mOnloadHandler = $js; }
 190         function getOnloadHandler() { return $this->mOnloadHandler; }
 191         function disable() { $this->mDoNothing = true; }
 192
 193         function setArticleRelated( $v ) {
 194                 $this->mIsArticleRelated = $v;
 195                 if ( !$v ) {
 196                         $this->mIsarticle = false;
 197                 }
 198         }
 199         function setArticleFlag( $v ) {
 200                 $this->mIsarticle = $v;
 201                 if ( $v ) {
 202                         $this->mIsArticleRelated = $v;
 203                 }
 204         }
 205
 206         function isArticleRelated() { return $this->mIsArticleRelated; }
 207
 208         function getLanguageLinks() { return $this->mLanguageLinks; }
 209         function addLanguageLinks($newLinkArray) {
 210                 $this->mLanguageLinks += $newLinkArray;
 211         }
 212         function setLanguageLinks($newLinkArray) {
 213                 $this->mLanguageLinks = $newLinkArray;
 214         }
 215
 216         function getCategoryLinks() {
 217                 return $this->mCategoryLinks;
 218         }
 219
 220         /**
 221          * Add an array of categories, with names in the keys
 222          */
 223         function addCategoryLinks($categories) {
 224                 global $wgUser, $wgContLang;
 225
 226                 if ( !is_array( $categories ) ) {
 227                         return;
 228                 }
 229                 # Add the links to the link cache in a batch
 230                 $arr = array( NS_CATEGORY => $categories );
 231                 $lb = new LinkBatch;
 232                 $lb->setArray( $arr );
 233                 $lb->execute();
 234
 235                 $sk =& $wgUser->getSkin();
 236                 foreach ( $categories as $category => $arbitrary ) {
 237                         $title = Title::makeTitleSafe( NS_CATEGORY, $category );
 238                         $text = $wgContLang->convertHtml( $title->getText() );
 239                         $this->mCategoryLinks[] = $sk->makeLinkObj( $title, $text );
 240                 }
 241         }
 242
 243         function setCategoryLinks($categories) {
 244                 $this->mCategoryLinks = array();
 245                 $this->addCategoryLinks($categories);
 246         }
 247
 248         function suppressQuickbar() { $this->mSuppressQuickbar = true; }
 249         function isQuickbarSuppressed() { return $this->mSuppressQuickbar; }
 250
 251         function addHTML( $text ) { $this->mBodytext .= $text; }
 252         function clearHTML() { $this->mBodytext = ''; }
 253         function getHTML() { return $this->mBodytext; }
 254         function debug( $text ) { $this->mDebugtext .= $text; }
 255
 256         /* @deprecated */
 257         function setParserOptions( $options ) {
 258                 return $this->ParserOptions( $options );
 259         }
 260
 261         function ParserOptions( $options = null ) {
 262                 return wfSetVar( $this->mParserOptions, $options );
 263         }
 264
 265         /**
 266          * Set the revision ID which will be seen by the wiki text parser
 267          * for things such as embedded {{REVISIONID}} variable use.
 268          * @param mixed $revid an integer, or NULL
 269          * @return mixed previous value
 270          */
 271         function setRevisionId( $revid ) {
 272                 $val = is_null( $revid ) ? null : intval( $revid );
 273                 return wfSetVar( $this->mRevisionId, $val );
 274         }
 275
 276         /**
 277          * Convert wikitext to HTML and add it to the buffer
 278          * Default assumes that the current page title will
 279          * be used.
 280          */
 281         function addWikiText( $text, $linestart = true ) {
 282                 global $wgTitle;
 283                 $this->addWikiTextTitle($text, $wgTitle, $linestart);
 284         }
 285
 286         function addWikiTextWithTitle($text, &$title, $linestart = true) {
 287                 $this->addWikiTextTitle($text, $title, $linestart);
 288         }
 289
 290         function addWikiTextTitle($text, &$title, $linestart) {
 291                 global $wgParser;
 292                 $fname = 'OutputPage:addWikiTextTitle';
 293                 wfProfileIn($fname);
 294                 wfIncrStats('pcache_not_possible');
 295                 $parserOutput = $wgParser->parse( $text, $title, $this->mParserOptions,
 296                         $linestart, true, $this->mRevisionId );
 297                 $this->addParserOutput( $parserOutput );
 298                 wfProfileOut($fname);
 299         }
 300
 301         function addParserOutputNoText( &$parserOutput ) {
 302                 $this->mLanguageLinks += $parserOutput->getLanguageLinks();
 303                 $this->addCategoryLinks( $parserOutput->getCategories() );
 304                 $this->mNewSectionLink = $parserOutput->getNewSection();
 305                 $this->addKeywords( $parserOutput );
 306                 if ( $parserOutput->getCacheTime() == -1 ) {
 307                         $this->enableClientCache( false );
 308                 }
 309                 if ( $parserOutput->mHTMLtitle != "" ) {
 310                         $this->mPagetitle = $parserOutput->mHTMLtitle ;
 311                 }
 312                 if ( $parserOutput->mSubtitle != '' ) {
 313                         $this->mSubtitle .= $parserOutput->mSubtitle ;
 314                 }
 315         }
 316
 317         function addParserOutput( &$parserOutput ) {
 318                 $this->addParserOutputNoText( $parserOutput );
 319                 $this->addHTML( $parserOutput->getText() );
 320         }
 321
 322         /**
 323          * Add wikitext to the buffer, assuming that this is the primary text for a page view
 324          * Saves the text into the parser cache if possible
 325          */
 326         function addPrimaryWikiText( $text, $article, $cache = true ) {
 327                 global $wgParser, $wgUser;
 328
 329                 $this->mParserOptions->setTidy(true);
 330                 $parserOutput = $wgParser->parse( $text, $article->mTitle,
 331                         $this->mParserOptions, true, true, $this->mRevisionId );
 332                 $this->mParserOptions->setTidy(false);
 333                 if ( $cache && $article && $parserOutput->getCacheTime() != -1 ) {
 334                         $parserCache =& ParserCache::singleton();
 335                         $parserCache->save( $parserOutput, $article, $wgUser );
 336                 }
 337
 338                 $this->addParserOutputNoText( $parserOutput );
 339                 $text = $parserOutput->getText();
 340                 $this->mNoGallery = $parserOutput->getNoGallery();
 341                 wfRunHooks( 'OutputPageBeforeHTML',array( &$this, &$text ) );
 342                 $parserOutput->setText( $text );
 343                 $this->addHTML( $parserOutput->getText() );
 344         }
 345
 346         /**
 347          * For anything that isn't primary text or interface message
 348          */
 349         function addSecondaryWikiText( $text, $linestart = true ) {
 350                 global $wgTitle;
 351                 $this->mParserOptions->setTidy(true);
 352                 $this->addWikiTextTitle($text, $wgTitle, $linestart);
 353                 $this->mParserOptions->setTidy(false);
 354         }
 355
 356
 357         /**
 358          * Add the output of a QuickTemplate to the output buffer
 359          * @param QuickTemplate $template
 360          */
 361         function addTemplate( &$template ) {
 362                 ob_start();
 363                 $template->execute();
 364                 $this->addHTML( ob_get_contents() );
 365                 ob_end_clean();
 366         }
 367
 368         /**
 369          * Parse wikitext and return the HTML.
 370          */
 371         function parse( $text, $linestart = true, $interface = false ) {
 372                 global $wgParser, $wgTitle;
 373                 if ( $interface) { $this->mParserOptions->setInterfaceMessage(true); }
 374                 $parserOutput = $wgParser->parse( $text, $wgTitle, $this->mParserOptions,
 375                         $linestart, true, $this->mRevisionId );
 376                 if ( $interface) { $this->mParserOptions->setInterfaceMessage(false); }
 377                 return $parserOutput->getText();
 378         }
 379
 380         /**
 381          * @param $article
 382          * @param $user
 383          *
 384          * @return bool
 385          */
 386         function tryParserCache( &$article, $user ) {
 387                 $parserCache =& ParserCache::singleton();
 388                 $parserOutput = $parserCache->get( $article, $user );
 389                 if ( $parserOutput !== false ) {
 390                         $this->addParserOutputNoText( $parserOutput );
 391                         $text = $parserOutput->getText();
 392                         wfRunHooks( 'OutputPageBeforeHTML', array( &$this, &$text ) );
 393                         $this->addHTML( $text );
 394                         return true;
 395                 } else {
 396                         return false;
 397                 }
 398         }
 399
 400         /**
 401          * Set the maximum cache time on the Squid in seconds
 402          * @param $maxage
 403          */
 404         function setSquidMaxage( $maxage ) {
 405                 $this->mSquidMaxage = $maxage;
 406         }
 407
 408         /**
 409          * Use enableClientCache(false) to force it to send nocache headers
 410          * @param $state
 411          */
 412         function enableClientCache( $state ) {
 413                 return wfSetVar( $this->mEnableClientCache, $state );
 414         }
 415
 416         function uncacheableBecauseRequestvars() {
 417                 global $wgRequest;
 418                 return  $wgRequest->getText('useskin', false) === false
 419                         && $wgRequest->getText('uselang', false) === false;
 420         }
 421
 422         function sendCacheControl() {
 423                 global $wgUseSquid, $wgUseESI, $wgSquidMaxage;
 424                 $fname = 'OutputPage::sendCacheControl';
 425
 426                 if ($this->mETag)
 427                         header("ETag: $this->mETag");
 428
 429                 # don't serve compressed data to clients who can't handle it
 430                 # maintain different caches for logged-in users and non-logged in ones
 431                 header( 'Vary: Accept-Encoding, Cookie' );
 432                 if( !$this->uncacheableBecauseRequestvars() && $this->mEnableClientCache ) {
 433                         if( $wgUseSquid && ! isset( $_COOKIE[ini_get( 'session.name') ] ) &&
 434                           ! $this->isPrintable() && $this->mSquidMaxage != 0 )
 435                         {
 436                                 if ( $wgUseESI ) {
 437                                         # We'll purge the proxy cache explicitly, but require end user agents
 438                                         # to revalidate against the proxy on each visit.
 439                                         # Surrogate-Control controls our Squid, Cache-Control downstream caches
 440                                         wfDebug( "$fname: proxy caching with ESI; {$this->mLastModified} **\n", false );
 441                                         # start with a shorter timeout for initial testing
 442                                         # header( 'Surrogate-Control: max-age=2678400+2678400, content="ESI/1.0"');
 443                                         header( 'Surrogate-Control: max-age='.$wgSquidMaxage.'+'.$this->mSquidMaxage.', content="ESI/1.0"');
 444                                         header( 'Cache-Control: s-maxage=0, must-revalidate, max-age=0' );
 445                                 } else {
 446                                         # We'll purge the proxy cache for anons explicitly, but require end user agents
 447                                         # to revalidate against the proxy on each visit.
 448                                         # IMPORTANT! The Squid needs to replace the Cache-Control header with
 449                                         # Cache-Control: s-maxage=0, must-revalidate, max-age=0
 450                                         wfDebug( "$fname: local proxy caching; {$this->mLastModified} **\n", false );
 451                                         # start with a shorter timeout for initial testing
 452                                         # header( "Cache-Control: s-maxage=2678400, must-revalidate, max-age=0" );
 453                                         header( 'Cache-Control: s-maxage='.$this->mSquidMaxage.', must-revalidate, max-age=0' );
 454                                 }
 455                         } else {
 456                                 # We do want clients to cache if they can, but they *must* check for updates
 457                                 # on revisiting the page.
 458                                 wfDebug( "$fname: private caching; {$this->mLastModified} **\n", false );
 459                                 header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
 460                                 header( "Cache-Control: private, must-revalidate, max-age=0" );
 461                         }
 462                         if($this->mLastModified) header( "Last-modified: {$this->mLastModified}" );
 463                 } else {
 464                         wfDebug( "$fname: no caching **\n", false );
 465
 466                         # In general, the absence of a last modified header should be enough to prevent
 467                         # the client from using its cache. We send a few other things just to make sure.
 468                         header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
 469                         header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
 470                         header( 'Pragma: no-cache' );
 471                 }
 472         }
 473
 474         /**
 475          * Finally, all the text has been munged and accumulated into
 476          * the object, let's actually output it:
 477          */
 478         function output() {
 479                 global $wgUser, $wgOutputEncoding;
 480                 global $wgContLanguageCode, $wgDebugRedirects, $wgMimeType;
 481                 global $wgJsMimeType, $wgStylePath, $wgUseAjax, $wgScriptPath, $wgServer;
 482
 483                 if( $this->mDoNothing ){
 484                         return;
 485                 }
 486                 $fname = 'OutputPage::output';
 487                 wfProfileIn( $fname );
 488                 $sk = $wgUser->getSkin();
 489
 490                 if ( $wgUseAjax ) {
 491                         $this->addScript( "<script type=\"{$wgJsMimeType}\">
 492                                 var wgScriptPath=\"{$wgScriptPath}\";
 493                                 var wgServer=\"{$wgServer}\";
 494                         </script>" );
 495                         $this->addScript( "<script type=\"{$wgJsMimeType}\" src=\"{$wgStylePath}/common/ajax.js\"></script>\n" );
 496                 }
 497
 498                 if ( '' != $this->mRedirect ) {
 499                         if( substr( $this->mRedirect, 0, 4 ) != 'http' ) {
 500                                 # Standards require redirect URLs to be absolute
 501                                 global $wgServer;
 502                                 $this->mRedirect = $wgServer . $this->mRedirect;
 503                         }
 504                         if( $this->mRedirectCode == '301') {
 505                                 if( !$wgDebugRedirects ) {
 506                                         header("HTTP/1.1 {$this->mRedirectCode} Moved Permanently");
 507                                 }
 508                                 $this->mLastModified = wfTimestamp( TS_RFC2822 );
 509                         }
 510
 511                         $this->sendCacheControl();
 512
 513                         if( $wgDebugRedirects ) {
 514                                 $url = htmlspecialchars( $this->mRedirect );
 515                                 print "<html>\n<head>\n<title>Redirect</title>\n</head>\n<body>\n";
 516                                 print "<p>Location: <a href=\"$url\">$url</a></p>\n";
 517                                 print "</body>\n</html>\n";
 518                         } else {
 519                                 header( 'Location: '.$this->mRedirect );
 520                         }
 521                         wfProfileOut( $fname );
 522                         return;
 523                 }
 524                 elseif ( $this->mStatusCode )
 525                 {
 526                         $statusMessage = array(
 527                                 100 => 'Continue',
 528                                 101 => 'Switching Protocols',
 529                                 102 => 'Processing',
 530                                 200 => 'OK',
 531                                 201 => 'Created',
 532                                 202 => 'Accepted',
 533                                 203 => 'Non-Authoritative Information',
 534                                 204 => 'No Content',
 535                                 205 => 'Reset Content',
 536                                 206 => 'Partial Content',
 537                                 207 => 'Multi-Status',
 538                                 300 => 'Multiple Choices',
 539                                 301 => 'Moved Permanently',
 540                                 302 => 'Found',
 541                                 303 => 'See Other',
 542                                 304 => 'Not Modified',
 543                                 305 => 'Use Proxy',
 544                                 307 => 'Temporary Redirect',
 545                                 400 => 'Bad Request',
 546                                 401 => 'Unauthorized',
 547                                 402 => 'Payment Required',
 548                                 403 => 'Forbidden',
 549                                 404 => 'Not Found',
 550                                 405 => 'Method Not Allowed',
 551                                 406 => 'Not Acceptable',
 552                                 407 => 'Proxy Authentication Required',
 553                                 408 => 'Request Timeout',
 554                                 409 => 'Conflict',
 555                                 410 => 'Gone',
 556                                 411 => 'Length Required',
 557                                 412 => 'Precondition Failed',
 558                                 413 => 'Request Entity Too Large',
 559                                 414 => 'Request-URI Too Large',
 560                                 415 => 'Unsupported Media Type',
 561                                 416 => 'Request Range Not Satisfiable',
 562                                 417 => 'Expectation Failed',
 563                                 422 => 'Unprocessable Entity',
 564                                 423 => 'Locked',
 565                                 424 => 'Failed Dependency',
 566                                 500 => 'Internal Server Error',
 567                                 501 => 'Not Implemented',
 568                                 502 => 'Bad Gateway',
 569                                 503 => 'Service Unavailable',
 570                                 504 => 'Gateway Timeout',
 571                                 505 => 'HTTP Version Not Supported',
 572                                 507 => 'Insufficient Storage'
 573                         );
 574
 575                         if ( $statusMessage[$this->mStatusCode] )
 576                                 header( 'HTTP/1.1 ' . $this->mStatusCode . ' ' . $statusMessage[$this->mStatusCode] );
 577                 }
 578
 579                 # Buffer output; final headers may depend on later processing
 580                 ob_start();
 581
 582                 # Disable temporary placeholders, so that the skin produces HTML
 583                 $sk->postParseLinkColour( false );
 584
 585                 header( "Content-type: $wgMimeType; charset={$wgOutputEncoding}" );
 586                 header( 'Content-language: '.$wgContLanguageCode );
 587
 588                 if ($this->mArticleBodyOnly) {
 589                         $this->out($this->mBodytext);
 590                 } else {
 591                         wfProfileIn( 'Output-skin' );
 592                         $sk->outputPage( $this );
 593                         wfProfileOut( 'Output-skin' );
 594                 }
 595
 596                 $this->sendCacheControl();
 597                 ob_end_flush();
 598                 wfProfileOut( $fname );
 599         }
 600
 601         function out( $ins ) {
 602                 global $wgInputEncoding, $wgOutputEncoding, $wgContLang;
 603                 if ( 0 == strcmp( $wgInputEncoding, $wgOutputEncoding ) ) {
 604                         $outs = $ins;
 605                 } else {
 606                         $outs = $wgContLang->iconv( $wgInputEncoding, $wgOutputEncoding, $ins );
 607                         if ( false === $outs ) { $outs = $ins; }
 608                 }
 609                 print $outs;
 610         }
 611
 612         function setEncodings() {
 613                 global $wgInputEncoding, $wgOutputEncoding;
 614                 global $wgUser, $wgContLang;
 615
 616                 $wgInputEncoding = strtolower( $wgInputEncoding );
 617
 618                 if( $wgUser->getOption( 'altencoding' ) ) {
 619                         $wgContLang->setAltEncoding();
 620                         return;
 621                 }
 622
 623                 if ( empty( $_SERVER['HTTP_ACCEPT_CHARSET'] ) ) {
 624                         $wgOutputEncoding = strtolower( $wgOutputEncoding );
 625                         return;
 626                 }
 627                 $wgOutputEncoding = $wgInputEncoding;
 628         }
 629
 630         /**
 631          * Returns a HTML comment with the elapsed time since request.
 632          * This method has no side effects.
 633          * Use wfReportTime() instead.
 634          * @return string
 635          * @deprecated
 636          */
 637         function reportTime() {
 638                 $time = wfReportTime();
 639                 return $time;
 640         }
 641
 642         /**
 643          * Produce a "user is blocked" page
 644          */
 645         function blockedPage( $return = true ) {
 646                 global $wgUser, $wgContLang, $wgTitle;
 647
 648                 $this->setPageTitle( wfMsg( 'blockedtitle' ) );
 649                 $this->setRobotpolicy( 'noindex,nofollow' );
 650                 $this->setArticleRelated( false );
 651
 652                 $id = $wgUser->blockedBy();
 653                 $reason = $wgUser->blockedFor();
 654                 $ip = wfGetIP();
 655
 656                 if ( is_numeric( $id ) ) {
 657                         $name = User::whoIs( $id );
 658                 } else {
 659                         $name = $id;
 660                 }
 661                 $link = '[[' . $wgContLang->getNsText( NS_USER ) . ":{$name}|{$name}]]";
 662
 663                 $this->addWikiText( wfMsg( 'blockedtext', $link, $reason, $ip, $name ) );
 664
 665                 # Don't auto-return to special pages
 666                 if( $return ) {
 667                         $return = $wgTitle->getNamespace() > -1 ? $wgTitle->getPrefixedText() : NULL;
 668                         $this->returnToMain( false, $return );
 669                 }
 670         }
 671
 672         /**
 673          * Note: these arguments are keys into wfMsg(), not text!
 674          */
 675         function showErrorPage( $title, $msg ) {
 676                 global $wgTitle;
 677
 678                 $this->mDebugtext .= 'Original title: ' .
 679                   $wgTitle->getPrefixedText() . "\n";
 680                 $this->setPageTitle( wfMsg( $title ) );
 681                 $this->setHTMLTitle( wfMsg( 'errorpagetitle' ) );
 682                 $this->setRobotpolicy( 'noindex,nofollow' );
 683                 $this->setArticleRelated( false );
 684                 $this->enableClientCache( false );
 685                 $this->mRedirect = '';
 686
 687                 $this->mBodytext = '';
 688                 $this->addWikiText( wfMsg( $msg ) );
 689                 $this->returnToMain( false );
 690         }
 691
 692         /** @obsolete */
 693         function errorpage( $title, $msg ) {
 694                 throw new ErrorPageError( $title, $msg );
 695         }
 696
 697         /**
 698          * Display an error page indicating that a given version of MediaWiki is
 699          * required to use it
 700          *
 701          * @param mixed $version The version of MediaWiki needed to use the page
 702          */
 703         function versionRequired( $version ) {
 704                 $this->setPageTitle( wfMsg( 'versionrequired', $version ) );
 705                 $this->setHTMLTitle( wfMsg( 'versionrequired', $version ) );
 706                 $this->setRobotpolicy( 'noindex,nofollow' );
 707                 $this->setArticleRelated( false );
 708                 $this->mBodytext = '';
 709
 710                 $this->addWikiText( wfMsg( 'versionrequiredtext', $version ) );
 711                 $this->returnToMain();
 712         }
 713
 714         /**
 715          * Display an error page noting that a given permission bit is required.
 716          * This should generally replace the sysopRequired, developerRequired etc.
 717          * @param string $permission key required
 718          */
 719         function permissionRequired( $permission ) {
 720                 global $wgUser;
 721
 722                 $this->setPageTitle( wfMsg( 'badaccess' ) );
 723                 $this->setHTMLTitle( wfMsg( 'errorpagetitle' ) );
 724                 $this->setRobotpolicy( 'noindex,nofollow' );
 725                 $this->setArticleRelated( false );
 726                 $this->mBodytext = '';
 727
 728                 $sk = $wgUser->getSkin();
 729                 $ap = $sk->makeKnownLink( wfMsgForContent( 'administrators' ) );
 730                 $this->addHTML( wfMsgHtml( 'badaccesstext', $ap, $permission ) );
 731                 $this->returnToMain();
 732         }
 733
 734         /**
 735          * @deprecated
 736          */
 737         function sysopRequired() {
 738                 global $wgUser;
 739
 740                 $this->setPageTitle( wfMsg( 'sysoptitle' ) );
 741                 $this->setHTMLTitle( wfMsg( 'errorpagetitle' ) );
 742                 $this->setRobotpolicy( 'noindex,nofollow' );
 743                 $this->setArticleRelated( false );
 744                 $this->mBodytext = '';
 745
 746                 $sk = $wgUser->getSkin();
 747                 $ap = $sk->makeKnownLink( wfMsgForContent( 'administrators' ), '' );
 748                 $this->addHTML( wfMsgHtml( 'sysoptext', $ap ) );
 749                 $this->returnToMain();
 750         }
 751
 752         /**
 753          * @deprecated
 754          */
 755         function developerRequired() {
 756                 global $wgUser;
 757
 758                 $this->setPageTitle( wfMsg( 'developertitle' ) );
 759                 $this->setHTMLTitle( wfMsg( 'errorpagetitle' ) );
 760                 $this->setRobotpolicy( 'noindex,nofollow' );
 761                 $this->setArticleRelated( false );
 762                 $this->mBodytext = '';
 763
 764                 $sk = $wgUser->getSkin();
 765                 $ap = $sk->makeKnownLink( wfMsgForContent( 'administrators' ), '' );
 766                 $this->addHTML( wfMsgHtml( 'developertext', $ap ) );
 767                 $this->returnToMain();
 768         }
 769
 770         /**
 771          * Produce the stock "please login to use the wiki" page
 772          */
 773         function loginToUse() {
 774                 global $wgUser, $wgTitle, $wgContLang;
 775                 $skin = $wgUser->getSkin();
 776
 777                 $this->setPageTitle( wfMsg( 'loginreqtitle' ) );
 778                 $this->setHtmlTitle( wfMsg( 'errorpagetitle' ) );
 779                 $this->setRobotPolicy( 'noindex,nofollow' );
 780                 $this->setArticleFlag( false );
 781
 782                 $loginTitle = Title::makeTitle( NS_SPECIAL, 'Userlogin' );
 783                 $loginLink = $skin->makeKnownLinkObj( $loginTitle, wfMsgHtml( 'loginreqlink' ), 'returnto=' . $wgTitle->getPrefixedUrl() );
 784                 $this->addHtml( wfMsgWikiHtml( 'loginreqpagetext', $loginLink ) );
 785                 $this->addHtml( "\n<!--" . $wgTitle->getPrefixedUrl() . "-->" );
 786
 787                 $this->returnToMain();
 788         }
 789
 790         /** @obsolete */
 791         function databaseError( $fname, $sql, $error, $errno ) {
 792                 throw new MWException( "OutputPage::databaseError is obsolete\n" );
 793         }
 794
 795         function readOnlyPage( $source = null, $protected = false ) {
 796                 global $wgUser, $wgReadOnlyFile, $wgReadOnly, $wgTitle;
 797
 798                 $this->setRobotpolicy( 'noindex,nofollow' );
 799                 $this->setArticleRelated( false );
 800
 801                 if( $protected ) {
 802                         $skin = $wgUser->getSkin();
 803                         $this->setPageTitle( wfMsg( 'viewsource' ) );
 804                         $this->setSubtitle( wfMsg( 'viewsourcefor', $skin->makeKnownLinkObj( $wgTitle ) ) );
 805
 806                         # Determine if protection is due to the page being a system message
 807                         # and show an appropriate explanation
 808                         if( $wgTitle->getNamespace() == NS_MEDIAWIKI && !$wgUser->isAllowed( 'editinterface' ) ) {
 809                                 $this->addWikiText( wfMsg( 'protectedinterface' ) );
 810                         } else {
 811                                 $this->addWikiText( wfMsg( 'protectedtext' ) );
 812                         }
 813                 } else {
 814                         $this->setPageTitle( wfMsg( 'readonly' ) );
 815                         if ( $wgReadOnly ) {
 816                                 $reason = $wgReadOnly;
 817                         } else {
 818                                 $reason = file_get_contents( $wgReadOnlyFile );
 819                         }
 820                         $this->addWikiText( wfMsg( 'readonlytext', $reason ) );
 821                 }
 822
 823                 if( is_string( $source ) ) {
 824                         if( strcmp( $source, '' ) == 0 ) {
 825                                 global $wgTitle;
 826                                 if ( $wgTitle->getNamespace() == NS_MEDIAWIKI ) {
 827                                         $source = wfMsgWeirdKey ( $wgTitle->getText() );
 828                                 } else {
 829                                         $source = '';
 830                                 }
 831                         }
 832                         $rows = $wgUser->getIntOption( 'rows' );
 833                         $cols = $wgUser->getIntOption( 'cols' );
 834
 835                         $text = "\n<textarea name='wpTextbox1' id='wpTextbox1' cols='$cols' rows='$rows' readonly='readonly'>" .
 836                                 htmlspecialchars( $source ) . "\n</textarea>";
 837                         $this->addHTML( $text );
 838                 }
 839
 840                 $this->returnToMain( false );
 841         }
 842
 843         /** @obsolete */
 844         function fatalError( $message ) {
 845                 throw new FatalError( $message );
 846         }
 847
 848         /** @obsolete */
 849         function unexpectedValueError( $name, $val ) {
 850                 throw new FatalError( wfMsg( 'unexpected', $name, $val ) );
 851         }
 852
 853         /** @obsolete */
 854         function fileCopyError( $old, $new ) {
 855                 throw new FatalError( wfMsg( 'filecopyerror', $old, $new ) );
 856         }
 857
 858         /** @obsolete */
 859         function fileRenameError( $old, $new ) {
 860                 throw new FatalError( wfMsg( 'filerenameerror', $old, $new ) );
 861         }
 862
 863         /** @obsolete */
 864         function fileDeleteError( $name ) {
 865                 throw new FatalError( wfMsg( 'filedeleteerror', $name ) );
 866         }
 867
 868         /** @obsolete */
 869         function fileNotFoundError( $name ) {
 870                 throw new FatalError( wfMsg( 'filenotfound', $name ) );
 871         }
 872
 873         function showFatalError( $message ) {
 874                 $this->setPageTitle( wfMsg( "internalerror" ) );
 875                 $this->setRobotpolicy( "noindex,nofollow" );
 876                 $this->setArticleRelated( false );
 877                 $this->enableClientCache( false );
 878                 $this->mRedirect = '';
 879                 $this->mBodytext = $message;
 880         }
 881
 882         function showUnexpectedValueError( $name, $val ) {
 883                 $this->showFatalError( wfMsg( 'unexpected', $name, $val ) );
 884         }
 885
 886         function showFileCopyError( $old, $new ) {
 887                 $this->showFatalError( wfMsg( 'filecopyerror', $old, $new ) );
 888         }
 889
 890         function showFileRenameError( $old, $new ) {
 891                 $this->showFatalError( wfMsg( 'filerenameerror', $old, $new ) );
 892         }
 893
 894         function showFileDeleteError( $name ) {
 895                 $this->showFatalError( wfMsg( 'filedeleteerror', $name ) );
 896         }
 897
 898         function showFileNotFoundError( $name ) {
 899                 $this->showFatalError( wfMsg( 'filenotfound', $name ) );
 900         }
 901
 902         /**
 903          * return from error messages or notes
 904          * @param $auto automatically redirect the user after 10 seconds
 905          * @param $returnto page title to return to. Default is Main Page.
 906          */
 907         function returnToMain( $auto = true, $returnto = NULL ) {
 908                 global $wgUser, $wgOut, $wgRequest;
 909
 910                 if ( $returnto == NULL ) {
 911                         $returnto = $wgRequest->getText( 'returnto' );
 912                 }
 913
 914                 if ( '' === $returnto ) {
 915                         $returnto = wfMsgForContent( 'mainpage' );
 916                 }
 917
 918                 if ( is_object( $returnto ) ) {
 919                         $titleObj = $returnto;
 920                 } else {
 921                         $titleObj = Title::newFromText( $returnto );
 922                 }
 923                 if ( !is_object( $titleObj ) ) {
 924                         $titleObj = Title::newMainPage();
 925                 }
 926
 927                 $sk = $wgUser->getSkin();
 928                 $link = $sk->makeLinkObj( $titleObj, '' );
 929
 930                 $r = wfMsg( 'returnto', $link );
 931                 if ( $auto ) {
 932                         $wgOut->addMeta( 'http:Refresh', '10;url=' . $titleObj->escapeFullURL() );
 933                 }
 934                 $wgOut->addHTML( "\n<p>$r</p>\n" );
 935         }
 936
 937         /**
 938          * This function takes the title (first item of mGoodLinks), categories, existing and broken links for the page
 939          * and uses the first 10 of them for META keywords
 940          */
 941         function addKeywords( &$parserOutput ) {
 942                 global $wgTitle;
 943                 $this->addKeyword( $wgTitle->getPrefixedText() );
 944                 $count = 1;
 945                 $links2d =& $parserOutput->getLinks();
 946                 if ( !is_array( $links2d ) ) {
 947                         return;
 948                 }
 949                 foreach ( $links2d as $ns => $dbkeys ) {
 950                         foreach( $dbkeys as $dbkey => $id ) {
 951                                 $this->addKeyword( $dbkey );
 952                                 if ( ++$count > 10 ) {
 953                                         break 2;
 954                                 }
 955                         }
 956                 }
 957         }
 958
 959         /**
 960          * @access private
 961          * @return string
 962          */
 963         function headElement() {
 964                 global $wgDocType, $wgDTD, $wgContLanguageCode, $wgOutputEncoding, $wgMimeType;
 965                 global $wgUser, $wgContLang, $wgUseTrackbacks, $wgTitle;
 966
 967                 if( $wgMimeType == 'text/xml' || $wgMimeType == 'application/xhtml+xml' || $wgMimeType == 'application/xml' ) {
 968                         $ret = "<?xml version=\"1.0\" encoding=\"$wgOutputEncoding\" ?>\n";
 969                 } else {
 970                         $ret = '';
 971                 }
 972
 973                 $ret .= "<!DOCTYPE html PUBLIC \"$wgDocType\"\n        \"$wgDTD\">\n";
 974
 975                 if ( '' == $this->getHTMLTitle() ) {
 976                         $this->setHTMLTitle(  wfMsg( 'pagetitle', $this->getPageTitle() ));
 977                 }
 978
 979                 $rtl = $wgContLang->isRTL() ? " dir='RTL'" : '';
 980                 $ret .= "<html xmlns=\"http://www.w3.org/1999/xhtml\" xml:lang=\"$wgContLanguageCode\" lang=\"$wgContLanguageCode\" $rtl>\n";
 981                 $ret .= "<head>\n<title>" . htmlspecialchars( $this->getHTMLTitle() ) . "</title>\n";
 982                 array_push( $this->mMetatags, array( "http:Content-type", "$wgMimeType; charset={$wgOutputEncoding}" ) );
 983
 984                 $ret .= $this->getHeadLinks();
 985                 global $wgStylePath;
 986                 if( $this->isPrintable() ) {
 987                         $media = '';
 988                 } else {
 989                         $media = "media='print'";
 990                 }
 991                 $printsheet = htmlspecialchars( "$wgStylePath/common/wikiprintable.css" );
 992                 $ret .= "<link rel='stylesheet' type='text/css' $media href='$printsheet' />\n";
 993
 994                 $sk = $wgUser->getSkin();
 995                 $ret .= $sk->getHeadScripts();
 996                 $ret .= $this->mScripts;
 997                 $ret .= $sk->getUserStyles();
 998
 999                 if ($wgUseTrackbacks && $this->isArticleRelated())
1000                         $ret .= $wgTitle->trackbackRDF();
1001
1002                 $ret .= "</head>\n";
1003                 return $ret;
1004         }
1005
1006         function getHeadLinks() {
1007                 global $wgRequest;
1008                 $ret = '';
1009                 foreach ( $this->mMetatags as $tag ) {
1010                         if ( 0 == strcasecmp( 'http:', substr( $tag[0], 0, 5 ) ) ) {
1011                                 $a = 'http-equiv';
1012                                 $tag[0] = substr( $tag[0], 5 );
1013                         } else {
1014                                 $a = 'name';
1015                         }
1016                         $ret .= "<meta $a=\"{$tag[0]}\" content=\"{$tag[1]}\" />\n";
1017                 }
1018
1019                 $p = $this->mRobotpolicy;
1020                 if( $p !== '' && $p != 'index,follow' ) {
1021                         // http://www.robotstxt.org/wc/meta-user.html
1022                         // Only show if it's different from the default robots policy
1023                         $ret .= "<meta name=\"robots\" content=\"$p\" />\n";
1024                 }
1025
1026                 if ( count( $this->mKeywords ) > 0 ) {
1027                         $strip = array(
1028                                 "/<.*?>/" => '',
1029                                 "/_/" => ' '
1030                         );
1031                         $ret .= "<meta name=\"keywords\" content=\"" .
1032                           htmlspecialchars(preg_replace(array_keys($strip), array_values($strip),implode( ",", $this->mKeywords ))) . "\" />\n";
1033                 }
1034                 foreach ( $this->mLinktags as $tag ) {
1035                         $ret .= '<link';
1036                         foreach( $tag as $attr => $val ) {
1037                                 $ret .= " $attr=\"" . htmlspecialchars( $val ) . "\"";
1038                         }
1039                         $ret .= " />\n";
1040                 }
1041                 if( $this->isSyndicated() ) {
1042                         # FIXME: centralize the mime-type and name information in Feed.php
1043                         $link = $wgRequest->escapeAppendQuery( 'feed=rss' );
1044                         $ret .= "<link rel='alternate' type='application/rss+xml' title='RSS 2.0' href='$link' />\n";
1045                         $link = $wgRequest->escapeAppendQuery( 'feed=atom' );
1046                         $ret .= "<link rel='alternate' type='application/atom+xml' title='Atom 0.3' href='$link' />\n";
1047                 }
1048
1049                 return $ret;
1050         }
1051
1052         /**
1053          * Turn off regular page output and return an error reponse
1054          * for when rate limiting has triggered.
1055          * @todo i18n
1056          * @access public
1057          */
1058         function rateLimited() {
1059                 global $wgOut;
1060                 $wgOut->disable();
1061                 wfHttpError( 500, 'Internal Server Error',
1062                         'Sorry, the server has encountered an internal error. ' .
1063                         'Please wait a moment and hit "refresh" to submit the request again.' );
1064         }
1065
1066         /**
1067          * Show an "add new section" link?
1068          *
1069          * @return bool True if the parser output instructs us to add one
1070          */
1071         function showNewSectionLink() {
1072                 return $this->mNewSectionLink;
1073         }
1074
1075 }
1076 ?>