includes/OutputPage.php

   1 <?php
   2 if ( ! defined( 'MEDIAWIKI' ) )
   3         die( 1 );
   4
   5 /**
   6  * @todo document
   7  */
   8 class OutputPage {
   9         var $mMetatags, $mKeywords;
  10         var $mLinktags, $mPagetitle, $mBodytext, $mDebugtext;
  11         var $mHTMLtitle, $mRobotpolicy, $mIsarticle, $mPrintable;
  12         var $mSubtitle, $mRedirect, $mStatusCode;
  13         var $mLastModified, $mETag, $mCategoryLinks;
  14         var $mScripts, $mLinkColours, $mPageLinkTitle;
  15
  16         var $mAllowUserJs;
  17         var $mSuppressQuickbar;
  18         var $mOnloadHandler;
  19         var $mDoNothing;
  20         var $mContainsOldMagic, $mContainsNewMagic;
  21         var $mIsArticleRelated;
  22         protected $mParserOptions; // lazy initialised, use parserOptions()
  23         var $mShowFeedLinks = false;
  24         var $mFeedLinksAppendQuery = false;
  25         var $mEnableClientCache = true;
  26         var $mArticleBodyOnly = false;
  27
  28         var $mNewSectionLink = false;
  29         var $mNoGallery = false;
  30         var $mPageTitleActionText = '';
  31         var $mParseWarnings = array();
  32
  33         /**
  34          * Constructor
  35          * Initialise private variables
  36          */
  37         function __construct() {
  38                 global $wgAllowUserJs;
  39                 $this->mAllowUserJs = $wgAllowUserJs;
  40                 $this->mMetatags = $this->mKeywords = $this->mLinktags = array();
  41                 $this->mHTMLtitle = $this->mPagetitle = $this->mBodytext =
  42                 $this->mRedirect = $this->mLastModified =
  43                 $this->mSubtitle = $this->mDebugtext = $this->mRobotpolicy =
  44                 $this->mOnloadHandler = $this->mPageLinkTitle = '';
  45                 $this->mIsArticleRelated = $this->mIsarticle = $this->mPrintable = true;
  46                 $this->mSuppressQuickbar = $this->mPrintable = false;
  47                 $this->mLanguageLinks = array();
  48                 $this->mCategoryLinks = array();
  49                 $this->mDoNothing = false;
  50                 $this->mContainsOldMagic = $this->mContainsNewMagic = 0;
  51                 $this->mParserOptions = null;
  52                 $this->mSquidMaxage = 0;
  53                 $this->mScripts = '';
  54                 $this->mHeadItems = array();
  55                 $this->mETag = false;
  56                 $this->mRevisionId = null;
  57                 $this->mNewSectionLink = false;
  58                 $this->mTemplateIds = array();
  59         }
  60
  61         public function redirect( $url, $responsecode = '302' ) {
  62                 # Strip newlines as a paranoia check for header injection in PHP<5.1.2
  63                 $this->mRedirect = str_replace( "\n", '', $url );
  64                 $this->mRedirectCode = $responsecode;
  65         }
  66
  67         public function getRedirect() {
  68                 return $this->mRedirect;
  69         }
  70
  71         /**
  72          * Set the HTTP status code to send with the output.
  73          *
  74          * @param int $statusCode
  75          * @return nothing
  76          */
  77         function setStatusCode( $statusCode ) { $this->mStatusCode = $statusCode; }
  78
  79         # To add an http-equiv meta tag, precede the name with "http:"
  80         function addMeta( $name, $val ) { array_push( $this->mMetatags, array( $name, $val ) ); }
  81         function addKeyword( $text ) { array_push( $this->mKeywords, $text ); }
  82         function addScript( $script ) { $this->mScripts .= "\t\t".$script; }
  83         function addStyle( $style ) {
  84                 global $wgStylePath, $wgStyleVersion;
  85                 $this->addLink(
  86                                 array(
  87                                         'rel' => 'stylesheet',
  88                                         'href' => $wgStylePath . '/' . $style . '?' . $wgStyleVersion ) );
  89         }
  90
  91         /**
  92          * Add a JavaScript file out of skins/common, or a given relative path.
  93          * @param string $file filename in skins/common or complete on-server path (/foo/bar.js)
  94          */
  95         function addScriptFile( $file ) {
  96                 global $wgStylePath, $wgStyleVersion, $wgJsMimeType;
  97                 if( substr( $file, 0, 1 ) == '/' ) {
  98                         $path = $file;
  99                 } else {
 100                         $path =  "{$wgStylePath}/common/{$file}";
 101                 }
 102                 $encPath = htmlspecialchars( $path );
 103                 $this->addScript( "<script type=\"{$wgJsMimeType}\" src=\"$path?$wgStyleVersion\"></script>\n" );
 104         }
 105
 106         /**
 107          * Add a self-contained script tag with the given contents
 108          * @param string $script JavaScript text, no <script> tags
 109          */
 110         function addInlineScript( $script ) {
 111                 global $wgJsMimeType;
 112                 $this->mScripts .= "<script type=\"$wgJsMimeType\">/*<![CDATA[*/\n$script\n/*]]>*/</script>";
 113         }
 114
 115         function getScript() {
 116                 return $this->mScripts . $this->getHeadItems();
 117         }
 118
 119         function getHeadItems() {
 120                 $s = '';
 121                 foreach ( $this->mHeadItems as $item ) {
 122                         $s .= $item;
 123                 }
 124                 return $s;
 125         }
 126
 127         function addHeadItem( $name, $value ) {
 128                 $this->mHeadItems[$name] = $value;
 129         }
 130
 131         function hasHeadItem( $name ) {
 132                 return isset( $this->mHeadItems[$name] );
 133         }
 134
 135         function setETag($tag) { $this->mETag = $tag; }
 136         function setArticleBodyOnly($only) { $this->mArticleBodyOnly = $only; }
 137         function getArticleBodyOnly($only) { return $this->mArticleBodyOnly; }
 138
 139         function addLink( $linkarr ) {
 140                 # $linkarr should be an associative array of attributes. We'll escape on output.
 141                 array_push( $this->mLinktags, $linkarr );
 142         }
 143
 144         function addMetadataLink( $linkarr ) {
 145                 # note: buggy CC software only reads first "meta" link
 146                 static $haveMeta = false;
 147                 $linkarr['rel'] = ($haveMeta) ? 'alternate meta' : 'meta';
 148                 $this->addLink( $linkarr );
 149                 $haveMeta = true;
 150         }
 151
 152         /**
 153          * checkLastModified tells the client to use the client-cached page if
 154          * possible. If sucessful, the OutputPage is disabled so that
 155          * any future call to OutputPage->output() have no effect.
 156          *
 157          * @return bool True iff cache-ok headers was sent.
 158          */
 159         function checkLastModified ( $timestamp ) {
 160                 global $wgCachePages, $wgCacheEpoch, $wgUser, $wgRequest;
 161
 162                 if ( !$timestamp || $timestamp == '19700101000000' ) {
 163                         wfDebug( __METHOD__ . ": CACHE DISABLED, NO TIMESTAMP\n" );
 164                         return;
 165                 }
 166                 if( !$wgCachePages ) {
 167                         wfDebug( __METHOD__ . ": CACHE DISABLED\n", false );
 168                         return;
 169                 }
 170                 if( $wgUser->getOption( 'nocache' ) ) {
 171                         wfDebug( __METHOD__ . ": USER DISABLED CACHE\n", false );
 172                         return;
 173                 }
 174
 175                 $timestamp=wfTimestamp(TS_MW,$timestamp);
 176                 $lastmod = wfTimestamp( TS_RFC2822, max( $timestamp, $wgUser->mTouched, $wgCacheEpoch ) );
 177
 178                 if( !empty( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) ) {
 179                         # IE sends sizes after the date like this:
 180                         # Wed, 20 Aug 2003 06:51:19 GMT; length=5202
 181                         # this breaks strtotime().
 182                         $modsince = preg_replace( '/;.*$/', '', $_SERVER["HTTP_IF_MODIFIED_SINCE"] );
 183
 184                         wfSuppressWarnings(); // E_STRICT system time bitching
 185                         $modsinceTime = strtotime( $modsince );
 186                         wfRestoreWarnings();
 187
 188                         $ismodsince = wfTimestamp( TS_MW, $modsinceTime ? $modsinceTime : 1 );
 189                         wfDebug( __METHOD__ . ": -- client send If-Modified-Since: " . $modsince . "\n", false );
 190                         wfDebug( __METHOD__ . ": --  we might send Last-Modified : $lastmod\n", false );
 191                         if( ($ismodsince >= $timestamp ) && $wgUser->validateCache( $ismodsince ) && $ismodsince >= $wgCacheEpoch ) {
 192                                 # Make sure you're in a place you can leave when you call us!
 193                                 $wgRequest->response()->header( "HTTP/1.0 304 Not Modified" );
 194                                 $this->mLastModified = $lastmod;
 195                                 $this->sendCacheControl();
 196                                 wfDebug( __METHOD__ . ": CACHED client: $ismodsince ; user: $wgUser->mTouched ; page: $timestamp ; site $wgCacheEpoch\n", false );
 197                                 $this->disable();
 198
 199                                 // Don't output a compressed blob when using ob_gzhandler;
 200                                 // it's technically against HTTP spec and seems to confuse
 201                                 // Firefox when the response gets split over two packets.
 202                                 wfClearOutputBuffers();
 203
 204                                 return true;
 205                         } else {
 206                                 wfDebug( __METHOD__ . ": READY  client: $ismodsince ; user: $wgUser->mTouched ; page: $timestamp ; site $wgCacheEpoch\n", false );
 207                                 $this->mLastModified = $lastmod;
 208                         }
 209                 } else {
 210                         wfDebug( __METHOD__ . ": client did not send If-Modified-Since header\n", false );
 211                         $this->mLastModified = $lastmod;
 212                 }
 213         }
 214
 215         function setPageTitleActionText( $text ) {
 216                 $this->mPageTitleActionText = $text;
 217         }
 218
 219         function getPageTitleActionText () {
 220                 if ( isset( $this->mPageTitleActionText ) ) {
 221                         return $this->mPageTitleActionText;
 222                 }
 223         }
 224
 225         public function setRobotpolicy( $str ) { $this->mRobotpolicy = $str; }
 226         public function setHTMLTitle( $name ) {$this->mHTMLtitle = $name; }
 227         public function setPageTitle( $name ) {
 228                 global $action, $wgContLang;
 229                 $name = $wgContLang->convert($name, true);
 230                 $this->mPagetitle = $name;
 231                 if(!empty($action)) {
 232                         $taction =  $this->getPageTitleActionText();
 233                         if( !empty( $taction ) ) {
 234                                 $name .= ' - '.$taction;
 235                         }
 236                 }
 237
 238                 $this->setHTMLTitle( wfMsg( 'pagetitle', $name ) );
 239         }
 240         public function getHTMLTitle() { return $this->mHTMLtitle; }
 241         public function getPageTitle() { return $this->mPagetitle; }
 242         public function setSubtitle( $str ) { $this->mSubtitle = /*$this->parse(*/$str/*)*/; } // @bug 2514
 243         public function appendSubtitle( $str ) { $this->mSubtitle .= /*$this->parse(*/$str/*)*/; } // @bug 2514
 244         public function getSubtitle() { return $this->mSubtitle; }
 245         public function isArticle() { return $this->mIsarticle; }
 246         public function setPrintable() { $this->mPrintable = true; }
 247         public function isPrintable() { return $this->mPrintable; }
 248         public function setSyndicated( $show = true ) { $this->mShowFeedLinks = $show; }
 249         public function isSyndicated() { return $this->mShowFeedLinks; }
 250         public function setFeedAppendQuery( $val ) { $this->mFeedLinksAppendQuery = $val; }
 251         public function getFeedAppendQuery() { return $this->mFeedLinksAppendQuery; }
 252         public function setOnloadHandler( $js ) { $this->mOnloadHandler = $js; }
 253         public function getOnloadHandler() { return $this->mOnloadHandler; }
 254         public function disable() { $this->mDoNothing = true; }
 255
 256         public function setArticleRelated( $v ) {
 257                 $this->mIsArticleRelated = $v;
 258                 if ( !$v ) {
 259                         $this->mIsarticle = false;
 260                 }
 261         }
 262         public function setArticleFlag( $v ) {
 263                 $this->mIsarticle = $v;
 264                 if ( $v ) {
 265                         $this->mIsArticleRelated = $v;
 266                 }
 267         }
 268
 269         public function isArticleRelated() { return $this->mIsArticleRelated; }
 270
 271         public function getLanguageLinks() { return $this->mLanguageLinks; }
 272         public function addLanguageLinks($newLinkArray) {
 273                 $this->mLanguageLinks += $newLinkArray;
 274         }
 275         public function setLanguageLinks($newLinkArray) {
 276                 $this->mLanguageLinks = $newLinkArray;
 277         }
 278
 279         public function getCategoryLinks() {
 280                 return $this->mCategoryLinks;
 281         }
 282
 283         /**
 284          * Add an array of categories, with names in the keys
 285          */
 286         public function addCategoryLinks( $categories ) {
 287                 global $wgUser, $wgContLang;
 288
 289                 if ( !is_array( $categories ) || count( $categories ) == 0 ) {
 290                         return;
 291                 }
 292
 293                 # Add the links to a LinkBatch
 294                 $arr = array( NS_CATEGORY => $categories );
 295                 $lb = new LinkBatch;
 296                 $lb->setArray( $arr );
 297
 298                 # Fetch existence plus the hiddencat property
 299                 $dbr = wfGetDB( DB_SLAVE );
 300                 $pageTable = $dbr->tableName( 'page' );
 301                 $where = $lb->constructSet( 'page', $dbr );
 302                 $propsTable = $dbr->tableName( 'page_props' );
 303                 $sql = "SELECT page_id, page_namespace, page_title, page_len, page_is_redirect, pp_value
 304                         FROM $pageTable LEFT JOIN $propsTable ON pp_propname='hiddencat' AND pp_page=page_id WHERE $where";
 305                 $res = $dbr->query( $sql, __METHOD__ );
 306
 307                 # Add the results to the link cache
 308                 $lb->addResultToCache( LinkCache::singleton(), $res );
 309
 310                 # Set all the values to 'normal'. This can be done with array_fill_keys in PHP 5.2.0+
 311                 $categories = array_combine( array_keys( $categories ),
 312                         array_fill( 0, count( $categories ), 'normal' ) );
 313
 314                 # Mark hidden categories
 315                 foreach ( $res as $row ) {
 316                         if ( isset( $row->pp_value ) ) {
 317                                 $categories[$row->page_title] = 'hidden';
 318                         }
 319                 }
 320
 321                 # Add the remaining categories to the skin
 322                 $sk = $wgUser->getSkin();
 323                 foreach ( $categories as $category => $type ) {
 324                         $title = Title::makeTitleSafe( NS_CATEGORY, $category );
 325                         $text = $wgContLang->convertHtml( $title->getText() );
 326                         $this->mCategoryLinks[$type][] = $sk->makeLinkObj( $title, $text );
 327                 }
 328         }
 329
 330         public function setCategoryLinks($categories) {
 331                 $this->mCategoryLinks = array();
 332                 $this->addCategoryLinks($categories);
 333         }
 334
 335         public function suppressQuickbar() { $this->mSuppressQuickbar = true; }
 336         public function isQuickbarSuppressed() { return $this->mSuppressQuickbar; }
 337
 338         public function disallowUserJs() { $this->mAllowUserJs = false; }
 339         public function isUserJsAllowed() { return $this->mAllowUserJs; }
 340
 341         public function addHTML( $text ) { $this->mBodytext .= $text; }
 342         public function clearHTML() { $this->mBodytext = ''; }
 343         public function getHTML() { return $this->mBodytext; }
 344         public function debug( $text ) { $this->mDebugtext .= $text; }
 345
 346         /* @deprecated */
 347         public function setParserOptions( $options ) {
 348                 wfDeprecated( __METHOD__ );
 349                 return $this->parserOptions( $options );
 350         }
 351
 352         public function parserOptions( $options = null ) {
 353                 if ( !$this->mParserOptions ) {
 354                         $this->mParserOptions = new ParserOptions;
 355                 }
 356                 return wfSetVar( $this->mParserOptions, $options );
 357         }
 358
 359         /**
 360          * Set the revision ID which will be seen by the wiki text parser
 361          * for things such as embedded {{REVISIONID}} variable use.
 362          * @param mixed $revid an integer, or NULL
 363          * @return mixed previous value
 364          */
 365         public function setRevisionId( $revid ) {
 366                 $val = is_null( $revid ) ? null : intval( $revid );
 367                 return wfSetVar( $this->mRevisionId, $val );
 368         }
 369
 370         /**
 371          * Convert wikitext to HTML and add it to the buffer
 372          * Default assumes that the current page title will
 373          * be used.
 374          *
 375          * @param string $text
 376          * @param bool   $linestart
 377          */
 378         public function addWikiText( $text, $linestart = true ) {
 379                 global $wgTitle;
 380                 $this->addWikiTextTitle($text, $wgTitle, $linestart);
 381         }
 382
 383         public function addWikiTextWithTitle($text, &$title, $linestart = true) {
 384                 $this->addWikiTextTitle($text, $title, $linestart);
 385         }
 386
 387         function addWikiTextTitleTidy($text, &$title, $linestart = true) {
 388                 $this->addWikiTextTitle( $text, $title, $linestart, true );
 389         }
 390
 391         public function addWikiTextTitle($text, &$title, $linestart, $tidy = false) {
 392                 global $wgParser;
 393
 394                 wfProfileIn( __METHOD__ );
 395
 396                 wfIncrStats( 'pcache_not_possible' );
 397
 398                 $popts = $this->parserOptions();
 399                 $oldTidy = $popts->setTidy( $tidy );
 400
 401                 $parserOutput = $wgParser->parse( $text, $title, $popts,
 402                         $linestart, true, $this->mRevisionId );
 403
 404                 $popts->setTidy( $oldTidy );
 405
 406                 $this->addParserOutput( $parserOutput );
 407
 408                 wfProfileOut( __METHOD__ );
 409         }
 410
 411         /**
 412          * @todo document
 413          * @param ParserOutput object &$parserOutput
 414          */
 415         public function addParserOutputNoText( &$parserOutput ) {
 416                 $this->mLanguageLinks += $parserOutput->getLanguageLinks();
 417                 $this->addCategoryLinks( $parserOutput->getCategories() );
 418                 $this->mNewSectionLink = $parserOutput->getNewSection();
 419                 $this->addKeywords( $parserOutput );
 420                 $this->mParseWarnings = $parserOutput->getWarnings();
 421                 if ( $parserOutput->getCacheTime() == -1 ) {
 422                         $this->enableClientCache( false );
 423                 }
 424                 $this->mNoGallery = $parserOutput->getNoGallery();
 425                 $this->mHeadItems = array_merge( $this->mHeadItems, (array)$parserOutput->mHeadItems );
 426                 // Versioning...
 427                 $this->mTemplateIds += (array)$parserOutput->mTemplateIds;
 428
 429                 // Display title
 430                 if( ( $dt = $parserOutput->getDisplayTitle() ) !== false )
 431                         $this->setPageTitle( $dt );
 432
 433                 // Hooks registered in the object
 434                 global $wgParserOutputHooks;
 435                 foreach ( $parserOutput->getOutputHooks() as $hookInfo ) {
 436                         list( $hookName, $data ) = $hookInfo;
 437                         if ( isset( $wgParserOutputHooks[$hookName] ) ) {
 438                                 call_user_func( $wgParserOutputHooks[$hookName], $this, $parserOutput, $data );
 439                         }
 440                 }
 441
 442                 wfRunHooks( 'OutputPageParserOutput', array( &$this, $parserOutput ) );
 443         }
 444
 445         /**
 446          * @todo document
 447          * @param ParserOutput &$parserOutput
 448          */
 449         function addParserOutput( &$parserOutput ) {
 450                 $this->addParserOutputNoText( $parserOutput );
 451                 $text = $parserOutput->getText();
 452                 wfRunHooks( 'OutputPageBeforeHTML',array( &$this, &$text ) );
 453                 $this->addHTML( $text );
 454         }
 455
 456         /**
 457          * Add wikitext to the buffer, assuming that this is the primary text for a page view
 458          * Saves the text into the parser cache if possible.
 459          *
 460          * @param string  $text
 461          * @param Article $article
 462          * @param bool    $cache
 463          * @deprecated Use Article::outputWikitext
 464          */
 465         public function addPrimaryWikiText( $text, $article, $cache = true ) {
 466                 global $wgParser, $wgUser;
 467
 468                 wfDeprecated( __METHOD__ );
 469
 470                 $popts = $this->parserOptions();
 471                 $popts->setTidy(true);
 472                 $parserOutput = $wgParser->parse( $text, $article->mTitle,
 473                         $popts, true, true, $this->mRevisionId );
 474                 $popts->setTidy(false);
 475                 if ( $cache && $article && $parserOutput->getCacheTime() != -1 ) {
 476                         $parserCache = ParserCache::singleton();
 477                         $parserCache->save( $parserOutput, $article, $wgUser );
 478                 }
 479
 480                 $this->addParserOutput( $parserOutput );
 481         }
 482
 483         /**
 484          * @deprecated use addWikiTextTidy()
 485          */
 486         public function addSecondaryWikiText( $text, $linestart = true ) {
 487                 global $wgTitle;
 488                 wfDeprecated( __METHOD__ );
 489                 $this->addWikiTextTitleTidy($text, $wgTitle, $linestart);
 490         }
 491
 492         /**
 493          * Add wikitext with tidy enabled
 494          */
 495         public function addWikiTextTidy(  $text, $linestart = true ) {
 496                 global $wgTitle;
 497                 $this->addWikiTextTitleTidy($text, $wgTitle, $linestart);
 498         }
 499
 500
 501         /**
 502          * Add the output of a QuickTemplate to the output buffer
 503          *
 504          * @param QuickTemplate $template
 505          */
 506         public function addTemplate( &$template ) {
 507                 ob_start();
 508                 $template->execute();
 509                 $this->addHTML( ob_get_contents() );
 510                 ob_end_clean();
 511         }
 512
 513         /**
 514          * Parse wikitext and return the HTML.
 515          *
 516          * @param string $text
 517          * @param bool   $linestart Is this the start of a line?
 518          * @param bool   $interface ??
 519          */
 520         public function parse( $text, $linestart = true, $interface = false ) {
 521                 global $wgParser, $wgTitle;
 522                 $popts = $this->parserOptions();
 523                 if ( $interface) { $popts->setInterfaceMessage(true); }
 524                 $parserOutput = $wgParser->parse( $text, $wgTitle, $popts,
 525                         $linestart, true, $this->mRevisionId );
 526                 if ( $interface) { $popts->setInterfaceMessage(false); }
 527                 return $parserOutput->getText();
 528         }
 529
 530         /**
 531          * @param Article $article
 532          * @param User    $user
 533          *
 534          * @return bool True if successful, else false.
 535          */
 536         public function tryParserCache( &$article, $user ) {
 537                 $parserCache = ParserCache::singleton();
 538                 $parserOutput = $parserCache->get( $article, $user );
 539                 if ( $parserOutput !== false ) {
 540                         $this->addParserOutput( $parserOutput );
 541                         return true;
 542                 } else {
 543                         return false;
 544                 }
 545         }
 546
 547         /**
 548          * @param int $maxage Maximum cache time on the Squid, in seconds.
 549          */
 550         public function setSquidMaxage( $maxage ) {
 551                 $this->mSquidMaxage = $maxage;
 552         }
 553
 554         /**
 555          * Use enableClientCache(false) to force it to send nocache headers
 556          * @param $state ??
 557          */
 558         public function enableClientCache( $state ) {
 559                 return wfSetVar( $this->mEnableClientCache, $state );
 560         }
 561
 562         function getCacheVaryCookies() {
 563                 global $wgCookiePrefix, $wgCacheVaryCookies;
 564                 static $cookies;
 565                 if ( $cookies === null ) {
 566                         $cookies = array_merge(
 567                                 array(
 568                                         "{$wgCookiePrefix}Token",
 569                                         "{$wgCookiePrefix}LoggedOut",
 570                                         session_name()
 571                                 ),
 572                                 $wgCacheVaryCookies
 573                         );
 574                         wfRunHooks('GetCacheVaryCookies', array( $this, &$cookies ) );
 575                 }
 576                 return $cookies;
 577         }
 578
 579         function uncacheableBecauseRequestVars() {
 580                 global $wgRequest;
 581                 return  $wgRequest->getText('useskin', false) === false
 582                         && $wgRequest->getText('uselang', false) === false;
 583         }
 584
 585         /**
 586          * Check if the request has a cache-varying cookie header
 587          * If it does, it's very important that we don't allow public caching
 588          */
 589         function haveCacheVaryCookies() {
 590                 global $wgRequest, $wgCookiePrefix;
 591                 $cookieHeader = $wgRequest->getHeader( 'cookie' );
 592                 if ( $cookieHeader === false ) {
 593                         return false;
 594                 }
 595                 $cvCookies = $this->getCacheVaryCookies();
 596                 foreach ( $cvCookies as $cookieName ) {
 597                         # Check for a simple string match, like the way squid does it
 598                         if ( strpos( $cookieHeader, $cookieName ) ) {
 599                                 wfDebug( __METHOD__.": found $cookieName\n" );
 600                                 return true;
 601                         }
 602                 }
 603                 wfDebug( __METHOD__.": no cache-varying cookies found\n" );
 604                 return false;
 605         }
 606
 607         /** Get a complete X-Vary-Options header */
 608         public function getXVO() {
 609                 global $wgCookiePrefix;
 610                 $cvCookies = $this->getCacheVaryCookies();
 611                 $xvo = 'X-Vary-Options: Accept-Encoding;list-contains=gzip,Cookie;';
 612                 $first = true;
 613                 foreach ( $cvCookies as $cookieName ) {
 614                         if ( $first ) {
 615                                 $first = false;
 616                         } else {
 617                                 $xvo .= ';';
 618                         }
 619                         $xvo .= 'string-contains=' . $cookieName;
 620                 }
 621                 return $xvo;
 622         }
 623
 624         public function sendCacheControl() {
 625                 global $wgUseSquid, $wgUseESI, $wgUseETag, $wgSquidMaxage, $wgRequest;
 626
 627                 $response = $wgRequest->response();
 628                 if ($wgUseETag && $this->mETag)
 629                         $response->header("ETag: $this->mETag");
 630
 631                 # don't serve compressed data to clients who can't handle it
 632                 # maintain different caches for logged-in users and non-logged in ones
 633                 $response->header( 'Vary: Accept-Encoding, Cookie' );
 634
 635                 # Add an X-Vary-Options header for Squid with Wikimedia patches
 636                 $response->header( $this->getXVO() );
 637
 638                 if( !$this->uncacheableBecauseRequestVars() && $this->mEnableClientCache ) {
 639                         if( $wgUseSquid && session_id() == '' &&
 640                           ! $this->isPrintable() && $this->mSquidMaxage != 0 && !$this->haveCacheVaryCookies() )
 641                         {
 642                                 if ( $wgUseESI ) {
 643                                         # We'll purge the proxy cache explicitly, but require end user agents
 644                                         # to revalidate against the proxy on each visit.
 645                                         # Surrogate-Control controls our Squid, Cache-Control downstream caches
 646                                         wfDebug( __METHOD__ . ": proxy caching with ESI; {$this->mLastModified} **\n", false );
 647                                         # start with a shorter timeout for initial testing
 648                                         # header( 'Surrogate-Control: max-age=2678400+2678400, content="ESI/1.0"');
 649                                         $response->header( 'Surrogate-Control: max-age='.$wgSquidMaxage.'+'.$this->mSquidMaxage.', content="ESI/1.0"');
 650                                         $response->header( 'Cache-Control: s-maxage=0, must-revalidate, max-age=0' );
 651                                 } else {
 652                                         # We'll purge the proxy cache for anons explicitly, but require end user agents
 653                                         # to revalidate against the proxy on each visit.
 654                                         # IMPORTANT! The Squid needs to replace the Cache-Control header with
 655                                         # Cache-Control: s-maxage=0, must-revalidate, max-age=0
 656                                         wfDebug( __METHOD__ . ": local proxy caching; {$this->mLastModified} **\n", false );
 657                                         # start with a shorter timeout for initial testing
 658                                         # header( "Cache-Control: s-maxage=2678400, must-revalidate, max-age=0" );
 659                                         $response->header( 'Cache-Control: s-maxage='.$this->mSquidMaxage.', must-revalidate, max-age=0' );
 660                                 }
 661                         } else {
 662                                 # We do want clients to cache if they can, but they *must* check for updates
 663                                 # on revisiting the page.
 664                                 wfDebug( __METHOD__ . ": private caching; {$this->mLastModified} **\n", false );
 665                                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
 666                                 $response->header( "Cache-Control: private, must-revalidate, max-age=0" );
 667                         }
 668                         if($this->mLastModified) $response->header( "Last-modified: {$this->mLastModified}" );
 669                 } else {
 670                         wfDebug( __METHOD__ . ": no caching **\n", false );
 671
 672                         # In general, the absence of a last modified header should be enough to prevent
 673                         # the client from using its cache. We send a few other things just to make sure.
 674                         $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
 675                         $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
 676                         $response->header( 'Pragma: no-cache' );
 677                 }
 678         }
 679
 680         /**
 681          * Finally, all the text has been munged and accumulated into
 682          * the object, let's actually output it:
 683          */
 684         public function output() {
 685                 global $wgUser, $wgOutputEncoding, $wgRequest;
 686                 global $wgContLanguageCode, $wgDebugRedirects, $wgMimeType;
 687                 global $wgJsMimeType, $wgUseAjax, $wgAjaxSearch, $wgAjaxWatch;
 688                 global $wgServer, $wgEnableMWSuggest;
 689
 690                 if( $this->mDoNothing ){
 691                         return;
 692                 }
 693
 694                 wfProfileIn( __METHOD__ );
 695
 696                 if ( '' != $this->mRedirect ) {
 697                         # Standards require redirect URLs to be absolute
 698                         $this->mRedirect = wfExpandUrl( $this->mRedirect );
 699                         if( $this->mRedirectCode == '301') {
 700                                 if( !$wgDebugRedirects ) {
 701                                         $wgRequest->response()->header("HTTP/1.1 {$this->mRedirectCode} Moved Permanently");
 702                                 }
 703                                 $this->mLastModified = wfTimestamp( TS_RFC2822 );
 704                         }
 705
 706                         $this->sendCacheControl();
 707
 708                         $wgRequest->response()->header("Content-Type: text/html; charset=utf-8");
 709                         if( $wgDebugRedirects ) {
 710                                 $url = htmlspecialchars( $this->mRedirect );
 711                                 print "<html>\n<head>\n<title>Redirect</title>\n</head>\n<body>\n";
 712                                 print "<p>Location: <a href=\"$url\">$url</a></p>\n";
 713                                 print "</body>\n</html>\n";
 714                         } else {
 715                                 $wgRequest->response()->header( 'Location: '.$this->mRedirect );
 716                         }
 717                         wfProfileOut( __METHOD__ );
 718                         return;
 719                 }
 720                 elseif ( $this->mStatusCode )
 721                 {
 722                         $statusMessage = array(
 723                                 100 => 'Continue',
 724                                 101 => 'Switching Protocols',
 725                                 102 => 'Processing',
 726                                 200 => 'OK',
 727                                 201 => 'Created',
 728                                 202 => 'Accepted',
 729                                 203 => 'Non-Authoritative Information',
 730                                 204 => 'No Content',
 731                                 205 => 'Reset Content',
 732                                 206 => 'Partial Content',
 733                                 207 => 'Multi-Status',
 734                                 300 => 'Multiple Choices',
 735                                 301 => 'Moved Permanently',
 736                                 302 => 'Found',
 737                                 303 => 'See Other',
 738                                 304 => 'Not Modified',
 739                                 305 => 'Use Proxy',
 740                                 307 => 'Temporary Redirect',
 741                                 400 => 'Bad Request',
 742                                 401 => 'Unauthorized',
 743                                 402 => 'Payment Required',
 744                                 403 => 'Forbidden',
 745                                 404 => 'Not Found',
 746                                 405 => 'Method Not Allowed',
 747                                 406 => 'Not Acceptable',
 748                                 407 => 'Proxy Authentication Required',
 749                                 408 => 'Request Timeout',
 750                                 409 => 'Conflict',
 751                                 410 => 'Gone',
 752                                 411 => 'Length Required',
 753                                 412 => 'Precondition Failed',
 754                                 413 => 'Request Entity Too Large',
 755                                 414 => 'Request-URI Too Large',
 756                                 415 => 'Unsupported Media Type',
 757                                 416 => 'Request Range Not Satisfiable',
 758                                 417 => 'Expectation Failed',
 759                                 422 => 'Unprocessable Entity',
 760                                 423 => 'Locked',
 761                                 424 => 'Failed Dependency',
 762                                 500 => 'Internal Server Error',
 763                                 501 => 'Not Implemented',
 764                                 502 => 'Bad Gateway',
 765                                 503 => 'Service Unavailable',
 766                                 504 => 'Gateway Timeout',
 767                                 505 => 'HTTP Version Not Supported',
 768                                 507 => 'Insufficient Storage'
 769                         );
 770
 771                         if ( $statusMessage[$this->mStatusCode] )
 772                                 $wgRequest->response()->header( 'HTTP/1.1 ' . $this->mStatusCode . ' ' . $statusMessage[$this->mStatusCode] );
 773                 }
 774
 775                 $sk = $wgUser->getSkin();
 776
 777                 if ( $wgUseAjax ) {
 778                         $this->addScriptFile( 'ajax.js' );
 779
 780                         wfRunHooks( 'AjaxAddScript', array( &$this ) );
 781
 782                         if( $wgAjaxSearch && $wgUser->getBoolOption( 'ajaxsearch' ) ) {
 783                                 $this->addScriptFile( 'ajaxsearch.js' );
 784                                 $this->addScript( "<script type=\"{$wgJsMimeType}\">hookEvent(\"load\", sajax_onload);</script>\n" );
 785                         }
 786
 787                         if( $wgAjaxWatch && $wgUser->isLoggedIn() ) {
 788                                 $this->addScriptFile( 'ajaxwatch.js' );
 789                         }
 790
 791                         if ( $wgEnableMWSuggest && !$wgUser->getOption( 'disablesuggest', false ) ){
 792                                 $this->addScriptFile( 'mwsuggest.js' );
 793                         }
 794                 }
 795
 796                 if( $wgUser->getBoolOption( 'editsectiononrightclick' ) ) {
 797                         $this->addScriptFile( 'rightclickedit.js' );
 798                 }
 799
 800
 801                 # Buffer output; final headers may depend on later processing
 802                 ob_start();
 803
 804                 # Disable temporary placeholders, so that the skin produces HTML
 805                 $sk->postParseLinkColour( false );
 806
 807                 $wgRequest->response()->header( "Content-type: $wgMimeType; charset={$wgOutputEncoding}" );
 808                 $wgRequest->response()->header( 'Content-language: '.$wgContLanguageCode );
 809
 810                 if ($this->mArticleBodyOnly) {
 811                         $this->out($this->mBodytext);
 812                 } else {
 813                         // Hook that allows last minute changes to the output page, e.g.
 814                         // adding of CSS or Javascript by extensions.
 815                         wfRunHooks( 'BeforePageDisplay', array( &$this, &$sk ) );
 816
 817                         wfProfileIn( 'Output-skin' );
 818                         $sk->outputPage( $this );
 819                         wfProfileOut( 'Output-skin' );
 820                 }
 821
 822                 $this->sendCacheControl();
 823                 ob_end_flush();
 824                 wfProfileOut( __METHOD__ );
 825         }
 826
 827         /**
 828          * @todo document
 829          * @param string $ins
 830          */
 831         public function out( $ins ) {
 832                 global $wgInputEncoding, $wgOutputEncoding, $wgContLang;
 833                 if ( 0 == strcmp( $wgInputEncoding, $wgOutputEncoding ) ) {
 834                         $outs = $ins;
 835                 } else {
 836                         $outs = $wgContLang->iconv( $wgInputEncoding, $wgOutputEncoding, $ins );
 837                         if ( false === $outs ) { $outs = $ins; }
 838                 }
 839                 print $outs;
 840         }
 841
 842         /**
 843          * @todo document
 844          */
 845         public static function setEncodings() {
 846                 global $wgInputEncoding, $wgOutputEncoding;
 847                 global $wgUser, $wgContLang;
 848
 849                 $wgInputEncoding = strtolower( $wgInputEncoding );
 850
 851                 if ( empty( $_SERVER['HTTP_ACCEPT_CHARSET'] ) ) {
 852                         $wgOutputEncoding = strtolower( $wgOutputEncoding );
 853                         return;
 854                 }
 855                 $wgOutputEncoding = $wgInputEncoding;
 856         }
 857
 858         /**
 859          * Deprecated, use wfReportTime() instead.
 860          * @return string
 861          * @deprecated
 862          */
 863         public function reportTime() {
 864                 wfDeprecated( __METHOD__ );
 865                 $time = wfReportTime();
 866                 return $time;
 867         }
 868
 869         /**
 870          * Produce a "user is blocked" page.
 871          *
 872          * @param bool $return Whether to have a "return to $wgTitle" message or not.
 873          * @return nothing
 874          */
 875         function blockedPage( $return = true ) {
 876                 global $wgUser, $wgContLang, $wgTitle, $wgLang;
 877
 878                 $this->setPageTitle( wfMsg( 'blockedtitle' ) );
 879                 $this->setRobotpolicy( 'noindex,nofollow' );
 880                 $this->setArticleRelated( false );
 881
 882                 $name = User::whoIs( $wgUser->blockedBy() );
 883                 $reason = $wgUser->blockedFor();
 884                 if( $reason == '' ) {
 885                         $reason = wfMsg( 'blockednoreason' );
 886                 }
 887                 $blockTimestamp = $wgLang->timeanddate( wfTimestamp( TS_MW, $wgUser->mBlock->mTimestamp ), true );
 888                 $ip = wfGetIP();
 889
 890                 $link = '[[' . $wgContLang->getNsText( NS_USER ) . ":{$name}|{$name}]]";
 891
 892                 $blockid = $wgUser->mBlock->mId;
 893
 894                 $blockExpiry = $wgUser->mBlock->mExpiry;
 895                 if ( $blockExpiry == 'infinity' ) {
 896                         // Entry in database (table ipblocks) is 'infinity' but 'ipboptions' uses 'infinite' or 'indefinite'
 897                         // Search for localization in 'ipboptions'
 898                         $scBlockExpiryOptions = wfMsg( 'ipboptions' );
 899                         foreach ( explode( ',', $scBlockExpiryOptions ) as $option ) {
 900                                 if ( strpos( $option, ":" ) === false )
 901                                         continue;
 902                                 list( $show, $value ) = explode( ":", $option );
 903                                 if ( $value == 'infinite' || $value == 'indefinite' ) {
 904                                         $blockExpiry = $show;
 905                                         break;
 906                                 }
 907                         }
 908                 } else {
 909                         $blockExpiry = $wgLang->timeanddate( wfTimestamp( TS_MW, $blockExpiry ), true );
 910                 }
 911
 912                 if ( $wgUser->mBlock->mAuto ) {
 913                         $msg = 'autoblockedtext';
 914                 } else {
 915                         $msg = 'blockedtext';
 916                 }
 917
 918                 /* $ip returns who *is* being blocked, $intended contains who was meant to be blocked.
 919                  * This could be a username, an ip range, or a single ip. */
 920                 $intended = $wgUser->mBlock->mAddress;
 921
 922                 $this->addWikiMsg( $msg, $link, $reason, $ip, $name, $blockid, $blockExpiry, $intended, $blockTimestamp );
 923
 924                 # Don't auto-return to special pages
 925                 if( $return ) {
 926                         $return = $wgTitle->getNamespace() > -1 ? $wgTitle : NULL;
 927                         $this->returnToMain( null, $return );
 928                 }
 929         }
 930
 931         /**
 932          * Output a standard error page
 933          *
 934          * @param string $title Message key for page title
 935          * @param string $msg Message key for page text
 936          * @param array $params Message parameters
 937          */
 938         public function showErrorPage( $title, $msg, $params = array() ) {
 939                 global $wgTitle;
 940                 if ( isset($wgTitle) ) {
 941                         $this->mDebugtext .= 'Original title: ' . $wgTitle->getPrefixedText() . "\n";
 942                 }
 943                 $this->setPageTitle( wfMsg( $title ) );
 944                 $this->setHTMLTitle( wfMsg( 'errorpagetitle' ) );
 945                 $this->setRobotpolicy( 'noindex,nofollow' );
 946                 $this->setArticleRelated( false );
 947                 $this->enableClientCache( false );
 948                 $this->mRedirect = '';
 949                 $this->mBodytext = '';
 950
 951                 array_unshift( $params, 'parse' );
 952                 array_unshift( $params, $msg );
 953                 $this->addHtml( call_user_func_array( 'wfMsgExt', $params ) );
 954
 955                 $this->returnToMain();
 956         }
 957
 958         /**
 959          * Output a standard permission error page
 960          *
 961          * @param array $errors Error message keys
 962          */
 963         public function showPermissionsErrorPage( $errors, $action = null )
 964         {
 965                 global $wgTitle;
 966
 967                 $this->mDebugtext .= 'Original title: ' .
 968                 $wgTitle->getPrefixedText() . "\n";
 969                 $this->setPageTitle( wfMsg( 'permissionserrors' ) );
 970                 $this->setHTMLTitle( wfMsg( 'permissionserrors' ) );
 971                 $this->setRobotpolicy( 'noindex,nofollow' );
 972                 $this->setArticleRelated( false );
 973                 $this->enableClientCache( false );
 974                 $this->mRedirect = '';
 975                 $this->mBodytext = '';
 976                 $this->addWikiText( $this->formatPermissionsErrorMessage( $errors, $action ) );
 977         }
 978
 979         /** @deprecated */
 980         public function errorpage( $title, $msg ) {
 981                 wfDeprecated( __METHOD__ );
 982                 throw new ErrorPageError( $title, $msg );
 983         }
 984
 985         /**
 986          * Display an error page indicating that a given version of MediaWiki is
 987          * required to use it
 988          *
 989          * @param mixed $version The version of MediaWiki needed to use the page
 990          */
 991         public function versionRequired( $version ) {
 992                 $this->setPageTitle( wfMsg( 'versionrequired', $version ) );
 993                 $this->setHTMLTitle( wfMsg( 'versionrequired', $version ) );
 994                 $this->setRobotpolicy( 'noindex,nofollow' );
 995                 $this->setArticleRelated( false );
 996                 $this->mBodytext = '';
 997
 998                 $this->addWikiMsg( 'versionrequiredtext', $version );
 999                 $this->returnToMain();
1000         }
1001
1002         /**
1003          * Display an error page noting that a given permission bit is required.
1004          *
1005          * @param string $permission key required
1006          */
1007         public function permissionRequired( $permission ) {
1008                 global $wgGroupPermissions, $wgUser;
1009
1010                 $this->setPageTitle( wfMsg( 'badaccess' ) );
1011                 $this->setHTMLTitle( wfMsg( 'errorpagetitle' ) );
1012                 $this->setRobotpolicy( 'noindex,nofollow' );
1013                 $this->setArticleRelated( false );
1014                 $this->mBodytext = '';
1015
1016                 $groups = array();
1017                 foreach( $wgGroupPermissions as $key => $value ) {
1018                         if( isset( $value[$permission] ) && $value[$permission] == true ) {
1019                                 $groupName = User::getGroupName( $key );
1020                                 $groupPage = User::getGroupPage( $key );
1021                                 if( $groupPage ) {
1022                                         $skin = $wgUser->getSkin();
1023                                         $groups[] = $skin->makeLinkObj( $groupPage, $groupName );
1024                                 } else {
1025                                         $groups[] = $groupName;
1026                                 }
1027                         }
1028                 }
1029                 $n = count( $groups );
1030                 $groups = implode( ', ', $groups );
1031                 switch( $n ) {
1032                         case 0:
1033                         case 1:
1034                         case 2:
1035                                 $message = wfMsgHtml( "badaccess-group$n", $groups );
1036                                 break;
1037                         default:
1038                                 $message = wfMsgHtml( 'badaccess-groups', $groups );
1039                 }
1040                 $this->addHtml( $message );
1041                 $this->returnToMain();
1042         }
1043
1044         /**
1045          * Use permissionRequired.
1046          * @deprecated
1047          */
1048         public function sysopRequired() {
1049                 throw new MWException( "Call to deprecated OutputPage::sysopRequired() method\n" );
1050         }
1051
1052         /**
1053          * Use permissionRequired.
1054          * @deprecated
1055          */
1056         public function developerRequired() {
1057                 throw new MWException( "Call to deprecated OutputPage::developerRequired() method\n" );
1058         }
1059
1060         /**
1061          * Produce the stock "please login to use the wiki" page
1062          */
1063         public function loginToUse() {
1064                 global $wgUser, $wgTitle, $wgContLang;
1065
1066                 if( $wgUser->isLoggedIn() ) {
1067                         $this->permissionRequired( 'read' );
1068                         return;
1069                 }
1070
1071                 $skin = $wgUser->getSkin();
1072
1073                 $this->setPageTitle( wfMsg( 'loginreqtitle' ) );
1074                 $this->setHtmlTitle( wfMsg( 'errorpagetitle' ) );
1075                 $this->setRobotPolicy( 'noindex,nofollow' );
1076                 $this->setArticleFlag( false );
1077
1078                 $loginTitle = SpecialPage::getTitleFor( 'Userlogin' );
1079                 $loginLink = $skin->makeKnownLinkObj( $loginTitle, wfMsgHtml( 'loginreqlink' ), 'returnto=' . $wgTitle->getPrefixedUrl() );
1080                 $this->addHtml( wfMsgWikiHtml( 'loginreqpagetext', $loginLink ) );
1081                 $this->addHtml( "\n<!--" . $wgTitle->getPrefixedUrl() . "-->" );
1082
1083                 # Don't return to the main page if the user can't read it
1084                 # otherwise we'll end up in a pointless loop
1085                 $mainPage = Title::newMainPage();
1086                 if( $mainPage->userCanRead() )
1087                         $this->returnToMain( null, $mainPage );
1088         }
1089
1090         /** @deprecated */
1091         public function databaseError( $fname, $sql, $error, $errno ) {
1092                 throw new MWException( "OutputPage::databaseError is obsolete\n" );
1093         }
1094
1095         /**
1096          * @param array $errors An array of arrays returned by Title::getUserPermissionsErrors
1097          * @return string The wikitext error-messages, formatted into a list.
1098          */
1099         public function formatPermissionsErrorMessage( $errors, $action = null ) {
1100                 if ($action == null) {
1101                         $text = wfMsgNoTrans( 'permissionserrorstext', count($errors)). "\n\n";
1102                 } else {
1103                         $action_desc = wfMsg( "right-$action" );
1104                         $action_desc[0] = strtolower($action_desc[0]);
1105                         $text = wfMsgNoTrans( 'permissionserrorstext-withaction', count($errors), $action_desc ) . "\n\n";
1106                 }
1107
1108                 if (count( $errors ) > 1) {
1109                         $text .= '<ul class="permissions-errors">' . "\n";
1110
1111                         foreach( $errors as $error )
1112                         {
1113                                 $text .= '<li>';
1114                                 $text .= call_user_func_array( 'wfMsgNoTrans', $error );
1115                                 $text .= "</li>\n";
1116                         }
1117                         $text .= '</ul>';
1118                 } else {
1119                         $text .= '<div class="permissions-errors">' . call_user_func_array( 'wfMsgNoTrans', reset( $errors ) ) . '</div>';
1120                 }
1121
1122                 return $text;
1123         }
1124
1125         /**
1126          * Display a page stating that the Wiki is in read-only mode,
1127          * and optionally show the source of the page that the user
1128          * was trying to edit.  Should only be called (for this
1129          * purpose) after wfReadOnly() has returned true.
1130          *
1131          * For historical reasons, this function is _also_ used to
1132          * show the error message when a user tries to edit a page
1133          * they are not allowed to edit.  (Unless it's because they're
1134          * blocked, then we show blockedPage() instead.)  In this
1135          * case, the second parameter should be set to true and a list
1136          * of reasons supplied as the third parameter.
1137          *
1138          * @todo Needs to be split into multiple functions.
1139          *
1140          * @param string $source    Source code to show (or null).
1141          * @param bool   $protected Is this a permissions error?
1142          * @param array  $reasons   List of reasons for this error, as returned by Title::getUserPermissionsErrors().
1143          */
1144         public function readOnlyPage( $source = null, $protected = false, $reasons = array(), $action = null ) {
1145                 global $wgUser, $wgTitle;
1146                 $skin = $wgUser->getSkin();
1147
1148                 $this->setRobotpolicy( 'noindex,nofollow' );
1149                 $this->setArticleRelated( false );
1150
1151                 // If no reason is given, just supply a default "I can't let you do
1152                 // that, Dave" message.  Should only occur if called by legacy code.
1153                 if ( $protected && empty($reasons) ) {
1154                         $reasons[] = array( 'badaccess-group0' );
1155                 }
1156
1157                 if ( !empty($reasons) ) {
1158                         // Permissions error
1159                         if( $source ) {
1160                                 $this->setPageTitle( wfMsg( 'viewsource' ) );
1161                                 $this->setSubtitle( wfMsg( 'viewsourcefor', $skin->makeKnownLinkObj( $wgTitle ) ) );
1162                         } else {
1163                                 $this->setPageTitle( wfMsg( 'badaccess' ) );
1164                         }
1165                         $this->addWikiText( $this->formatPermissionsErrorMessage( $reasons, $action ) );
1166                 } else {
1167                         // Wiki is read only
1168                         $this->setPageTitle( wfMsg( 'readonly' ) );
1169                         $reason = wfReadOnlyReason();
1170                         $this->addWikiMsg( 'readonlytext', $reason );
1171                 }
1172
1173                 // Show source, if supplied
1174                 if( is_string( $source ) ) {
1175                         $this->addWikiMsg( 'viewsourcetext' );
1176                         $text = Xml::openElement( 'textarea',
1177                                                 array( 'id'   => 'wpTextbox1',
1178                                                        'name' => 'wpTextbox1',
1179                                                        'cols' => $wgUser->getOption( 'cols' ),
1180                                                        'rows' => $wgUser->getOption( 'rows' ),
1181                                                        'readonly' => 'readonly' ) );
1182                         $text .= htmlspecialchars( $source );
1183                         $text .= Xml::closeElement( 'textarea' );
1184                         $this->addHTML( $text );
1185
1186                         // Show templates used by this article
1187                         $skin = $wgUser->getSkin();
1188                         $article = new Article( $wgTitle );
1189                         $this->addHTML( $skin->formatTemplates( $article->getUsedTemplates() ) );
1190                 }
1191
1192                 # If the title doesn't exist, it's fairly pointless to print a return
1193                 # link to it.  After all, you just tried editing it and couldn't, so
1194                 # what's there to do there?
1195                 if( $wgTitle->exists() ) {
1196                         $this->returnToMain( null, $wgTitle );
1197                 }
1198         }
1199
1200         /** @deprecated */
1201         public function fatalError( $message ) {
1202                 wfDeprecated( __METHOD__ );
1203                 throw new FatalError( $message );
1204         }
1205
1206         /** @deprecated */
1207         public function unexpectedValueError( $name, $val ) {
1208                 wfDeprecated( __METHOD__ );
1209                 throw new FatalError( wfMsg( 'unexpected', $name, $val ) );
1210         }
1211
1212         /** @deprecated */
1213         public function fileCopyError( $old, $new ) {
1214                 wfDeprecated( __METHOD__ );
1215                 throw new FatalError( wfMsg( 'filecopyerror', $old, $new ) );
1216         }
1217
1218         /** @deprecated */
1219         public function fileRenameError( $old, $new ) {
1220                 wfDeprecated( __METHOD__ );
1221                 throw new FatalError( wfMsg( 'filerenameerror', $old, $new ) );
1222         }
1223
1224         /** @deprecated */
1225         public function fileDeleteError( $name ) {
1226                 wfDeprecated( __METHOD__ );
1227                 throw new FatalError( wfMsg( 'filedeleteerror', $name ) );
1228         }
1229
1230         /** @deprecated */
1231         public function fileNotFoundError( $name ) {
1232                 wfDeprecated( __METHOD__ );
1233                 throw new FatalError( wfMsg( 'filenotfound', $name ) );
1234         }
1235
1236         public function showFatalError( $message ) {
1237                 $this->setPageTitle( wfMsg( "internalerror" ) );
1238                 $this->setRobotpolicy( "noindex,nofollow" );
1239                 $this->setArticleRelated( false );
1240                 $this->enableClientCache( false );
1241                 $this->mRedirect = '';
1242                 $this->mBodytext = $message;
1243         }
1244
1245         public function showUnexpectedValueError( $name, $val ) {
1246                 $this->showFatalError( wfMsg( 'unexpected', $name, $val ) );
1247         }
1248
1249         public function showFileCopyError( $old, $new ) {
1250                 $this->showFatalError( wfMsg( 'filecopyerror', $old, $new ) );
1251         }
1252
1253         public function showFileRenameError( $old, $new ) {
1254                 $this->showFatalError( wfMsg( 'filerenameerror', $old, $new ) );
1255         }
1256
1257         public function showFileDeleteError( $name ) {
1258                 $this->showFatalError( wfMsg( 'filedeleteerror', $name ) );
1259         }
1260
1261         public function showFileNotFoundError( $name ) {
1262                 $this->showFatalError( wfMsg( 'filenotfound', $name ) );
1263         }
1264
1265         /**
1266          * Add a "return to" link pointing to a specified title
1267          *
1268          * @param Title $title Title to link
1269          */
1270         public function addReturnTo( $title ) {
1271                 global $wgUser;
1272                 $link = wfMsg( 'returnto', $wgUser->getSkin()->makeLinkObj( $title ) );
1273                 $this->addHtml( "<p>{$link}</p>\n" );
1274         }
1275
1276         /**
1277          * Add a "return to" link pointing to a specified title,
1278          * or the title indicated in the request, or else the main page
1279          *
1280          * @param null $unused No longer used
1281          * @param Title $returnto Title to return to
1282          */
1283         public function returnToMain( $unused = null, $returnto = NULL ) {
1284                 global $wgRequest;
1285
1286                 if ( $returnto == NULL ) {
1287                         $returnto = $wgRequest->getText( 'returnto' );
1288                 }
1289
1290                 if ( '' === $returnto ) {
1291                         $returnto = Title::newMainPage();
1292                 }
1293
1294                 if ( is_object( $returnto ) ) {
1295                         $titleObj = $returnto;
1296                 } else {
1297                         $titleObj = Title::newFromText( $returnto );
1298                 }
1299                 if ( !is_object( $titleObj ) ) {
1300                         $titleObj = Title::newMainPage();
1301                 }
1302
1303                 $this->addReturnTo( $titleObj );
1304         }
1305
1306         /**
1307          * This function takes the title (first item of mGoodLinks), categories, existing and broken links for the page
1308          * and uses the first 10 of them for META keywords
1309          *
1310          * @param ParserOutput &$parserOutput
1311          */
1312         private function addKeywords( &$parserOutput ) {
1313                 global $wgTitle;
1314                 $this->addKeyword( $wgTitle->getPrefixedText() );
1315                 $count = 1;
1316                 $links2d =& $parserOutput->getLinks();
1317                 if ( !is_array( $links2d ) ) {
1318                         return;
1319                 }
1320                 foreach ( $links2d as $dbkeys ) {
1321                         foreach( $dbkeys as $dbkey => $unused ) {
1322                                 $this->addKeyword( $dbkey );
1323                                 if ( ++$count > 10 ) {
1324                                         break 2;
1325                                 }
1326                         }
1327                 }
1328         }
1329
1330         /**
1331          * @return string The doctype, opening <html>, and head element.
1332          */
1333         public function headElement() {
1334                 global $wgDocType, $wgDTD, $wgContLanguageCode, $wgOutputEncoding, $wgMimeType;
1335                 global $wgXhtmlDefaultNamespace, $wgXhtmlNamespaces;
1336                 global $wgUser, $wgContLang, $wgUseTrackbacks, $wgTitle, $wgStyleVersion;
1337
1338                 if( $wgMimeType == 'text/xml' || $wgMimeType == 'application/xhtml+xml' || $wgMimeType == 'application/xml' ) {
1339                         $ret = "<?xml version=\"1.0\" encoding=\"$wgOutputEncoding\" ?>\n";
1340                 } else {
1341                         $ret = '';
1342                 }
1343
1344                 $ret .= "<!DOCTYPE html PUBLIC \"$wgDocType\"\n        \"$wgDTD\">\n";
1345
1346                 if ( '' == $this->getHTMLTitle() ) {
1347                         $this->setHTMLTitle(  wfMsg( 'pagetitle', $this->getPageTitle() ));
1348                 }
1349
1350                 $rtl = $wgContLang->isRTL() ? " dir='RTL'" : '';
1351                 $ret .= "<html xmlns=\"{$wgXhtmlDefaultNamespace}\" ";
1352                 foreach($wgXhtmlNamespaces as $tag => $ns) {
1353                         $ret .= "xmlns:{$tag}=\"{$ns}\" ";
1354                 }
1355                 $ret .= "xml:lang=\"$wgContLanguageCode\" lang=\"$wgContLanguageCode\" $rtl>\n";
1356                 $ret .= "<head>\n<title>" . htmlspecialchars( $this->getHTMLTitle() ) . "</title>\n";
1357                 array_push( $this->mMetatags, array( "http:Content-type", "$wgMimeType; charset={$wgOutputEncoding}" ) );
1358
1359                 $ret .= $this->getHeadLinks();
1360                 global $wgStylePath;
1361                 if( $this->isPrintable() ) {
1362                         $media = '';
1363                 } else {
1364                         $media = "media='print'";
1365                 }
1366                 $printsheet = htmlspecialchars( "$wgStylePath/common/wikiprintable.css?$wgStyleVersion" );
1367                 $ret .= "<link rel='stylesheet' type='text/css' $media href='$printsheet' />\n";
1368
1369                 $sk = $wgUser->getSkin();
1370                 $ret .= $sk->getHeadScripts( $this->mAllowUserJs );
1371                 $ret .= $this->mScripts;
1372                 $ret .= $sk->getUserStyles();
1373                 $ret .= $this->getHeadItems();
1374
1375                 if ($wgUseTrackbacks && $this->isArticleRelated())
1376                         $ret .= $wgTitle->trackbackRDF();
1377
1378                 $ret .= "</head>\n";
1379                 return $ret;
1380         }
1381
1382         /**
1383          * @return string HTML tag links to be put in the header.
1384          */
1385         public function getHeadLinks() {
1386                 global $wgRequest, $wgFeed;
1387                 $ret = '';
1388                 foreach ( $this->mMetatags as $tag ) {
1389                         if ( 0 == strcasecmp( 'http:', substr( $tag[0], 0, 5 ) ) ) {
1390                                 $a = 'http-equiv';
1391                                 $tag[0] = substr( $tag[0], 5 );
1392                         } else {
1393                                 $a = 'name';
1394                         }
1395                         $ret .= "<meta $a=\"{$tag[0]}\" content=\"{$tag[1]}\" />\n";
1396                 }
1397
1398                 $p = $this->mRobotpolicy;
1399                 if( $p !== '' && $p != 'index,follow' ) {
1400                         // http://www.robotstxt.org/wc/meta-user.html
1401                         // Only show if it's different from the default robots policy
1402                         $ret .= "<meta name=\"robots\" content=\"$p\" />\n";
1403                 }
1404
1405                 if ( count( $this->mKeywords ) > 0 ) {
1406                         $strip = array(
1407                                 "/<.*?>/" => '',
1408                                 "/_/" => ' '
1409                         );
1410                         $ret .= "\t\t<meta name=\"keywords\" content=\"" .
1411                           htmlspecialchars(preg_replace(array_keys($strip), array_values($strip),implode( ",", $this->mKeywords ))) . "\" />\n";
1412                 }
1413                 foreach ( $this->mLinktags as $tag ) {
1414                         $ret .= "\t\t<link";
1415                         foreach( $tag as $attr => $val ) {
1416                                 $ret .= " $attr=\"" . htmlspecialchars( $val ) . "\"";
1417                         }
1418                         $ret .= " />\n";
1419                 }
1420
1421                 if( $wgFeed ) {
1422                         foreach( $this->getSyndicationLinks() as $format => $link ) {
1423                                 # Use the page name for the title (accessed through $wgTitle since
1424                                 # there's no other way).  In principle, this could lead to issues
1425                                 # with having the same name for different feeds corresponding to
1426                                 # the same page, but we can't avoid that at this low a level.
1427                                 global $wgTitle;
1428
1429                                 $ret .= $this->feedLink(
1430                                         $format,
1431                                         $link,
1432                                         wfMsg( "page-{$format}-feed", $wgTitle->getPrefixedText() ) ); # Used messages: 'page-rss-feed' and 'page-atom-feed' (for an easier grep)
1433                         }
1434
1435                         # Recent changes feed should appear on every page
1436                         # Put it after the per-page feed to avoid changing existing behavior.
1437                         # It's still available, probably via a menu in your browser.
1438                         global $wgSitename;
1439                         $rctitle = SpecialPage::getTitleFor( 'Recentchanges' );
1440                         $ret .= $this->feedLink(
1441                                 'rss',
1442                                 $rctitle->getFullURL( 'feed=rss' ),
1443                                 wfMsg( 'site-rss-feed', $wgSitename ) );
1444                         $ret .= $this->feedLink(
1445                                 'atom',
1446                                 $rctitle->getFullURL( 'feed=atom' ),
1447                                 wfMsg( 'site-atom-feed', $wgSitename ) );
1448                 }
1449
1450                 return $ret;
1451         }
1452
1453         /**
1454          * Return URLs for each supported syndication format for this page.
1455          * @return array associating format keys with URLs
1456          */
1457         public function getSyndicationLinks() {
1458                 global $wgTitle, $wgFeedClasses;
1459                 $links = array();
1460
1461                 if( $this->isSyndicated() ) {
1462                         if( is_string( $this->getFeedAppendQuery() ) ) {
1463                                 $appendQuery = "&" . $this->getFeedAppendQuery();
1464                         } else {
1465                                 $appendQuery = "";
1466                         }
1467
1468                         foreach( $wgFeedClasses as $format => $class ) {
1469                                 $links[$format] = $wgTitle->getLocalUrl( "feed=$format{$appendQuery}" );
1470                         }
1471                 }
1472                 return $links;
1473         }
1474
1475         /**
1476          * Generate a <link rel/> for an RSS feed.
1477          */
1478         private function feedLink( $type, $url, $text ) {
1479                 return Xml::element( 'link', array(
1480                         'rel' => 'alternate',
1481                         'type' => "application/$type+xml",
1482                         'title' => $text,
1483                         'href' => $url ) ) . "\n";
1484         }
1485
1486         /**
1487          * Turn off regular page output and return an error reponse
1488          * for when rate limiting has triggered.
1489          */
1490         public function rateLimited() {
1491                 global $wgTitle;
1492
1493                 $this->setPageTitle(wfMsg('actionthrottled'));
1494                 $this->setRobotPolicy( 'noindex,follow' );
1495                 $this->setArticleRelated( false );
1496                 $this->enableClientCache( false );
1497                 $this->mRedirect = '';
1498                 $this->clearHTML();
1499                 $this->setStatusCode(503);
1500                 $this->addWikiMsg( 'actionthrottledtext' );
1501
1502                 $this->returnToMain( null, $wgTitle );
1503         }
1504
1505         /**
1506          * Show an "add new section" link?
1507          *
1508          * @return bool
1509          */
1510         public function showNewSectionLink() {
1511                 return $this->mNewSectionLink;
1512         }
1513
1514         /**
1515          * Show a warning about slave lag
1516          *
1517          * If the lag is higher than $wgSlaveLagCritical seconds,
1518          * then the warning is a bit more obvious. If the lag is
1519          * lower than $wgSlaveLagWarning, then no warning is shown.
1520          *
1521          * @param int $lag Slave lag
1522          */
1523         public function showLagWarning( $lag ) {
1524                 global $wgSlaveLagWarning, $wgSlaveLagCritical;
1525                 if( $lag >= $wgSlaveLagWarning ) {
1526                         $message = $lag < $wgSlaveLagCritical
1527                                 ? 'lag-warn-normal'
1528                                 : 'lag-warn-high';
1529                         $warning = wfMsgExt( $message, 'parse', $lag );
1530                         $this->addHtml( "<div class=\"mw-{$message}\">\n{$warning}\n</div>\n" );
1531                 }
1532         }
1533
1534         /**
1535          * Add a wikitext-formatted message to the output.
1536          * This is equivalent to:
1537          *
1538          *    $wgOut->addWikiText( wfMsgNoTrans( ... ) )
1539          */
1540         public function addWikiMsg( /*...*/ ) {
1541                 $args = func_get_args();
1542                 $name = array_shift( $args );
1543                 $this->addWikiMsgArray( $name, $args );
1544         }
1545
1546         /**
1547          * Add a wikitext-formatted message to the output.
1548          * Like addWikiMsg() except the parameters are taken as an array
1549          * instead of a variable argument list.
1550          *
1551          * $options is passed through to wfMsgExt(), see that function for details.
1552          */
1553         public function addWikiMsgArray( $name, $args, $options = array() ) {
1554                 $options[] = 'parse';
1555                 $text = wfMsgExt( $name, $options, $args );
1556                 $this->addHTML( $text );
1557         }
1558
1559         /**
1560          * This function takes a number of message/argument specifications, wraps them in
1561          * some overall structure, and then parses the result and adds it to the output.
1562          *
1563          * In the $wrap, $1 is replaced with the first message, $2 with the second, and so
1564          * on. The subsequent arguments may either be strings, in which case they are the
1565          * message names, or an arrays, in which case the first element is the message name,
1566          * and subsequent elements are the parameters to that message.
1567          *
1568          * The special named parameter 'options' in a message specification array is passed
1569          * through to the $options parameter of wfMsgExt().
1570          *
1571          * Don't use this for messages that are not in users interface language.
1572          *
1573          * For example:
1574          *
1575          *    $wgOut->wrapWikiMsg( '<div class="error">$1</div>', 'some-error' );
1576          *
1577          * Is equivalent to:
1578          *
1579          *    $wgOut->addWikiText( '<div class="error">' . wfMsgNoTrans( 'some-error' ) . '</div>' );
1580          */
1581         public function wrapWikiMsg( $wrap /*, ...*/ ) {
1582                 $msgSpecs = func_get_args();
1583                 array_shift( $msgSpecs );
1584                 $msgSpecs = array_values( $msgSpecs );
1585                 $s = $wrap;
1586                 foreach ( $msgSpecs as $n => $spec ) {
1587                         $options = array();
1588                         if ( is_array( $spec ) ) {
1589                                 $args = $spec;
1590                                 $name = array_shift( $args );
1591                                 if ( isset( $args['options'] ) ) {
1592                                         $options = $args['options'];
1593                                         unset( $args['options'] );
1594                                 }
1595                         }  else {
1596                                 $args = array();
1597                                 $name = $spec;
1598                         }
1599                         $s = str_replace( '$' . ($n+1), wfMsgExt( $name, $options, $args ), $s );
1600                 }
1601                 $this->addHTML( $this->parse( $s, /*linestart*/true, /*uilang*/true ) );
1602         }
1603 }