includes/OutputPage.php

   1 <?php
   2 /**
   3  * @package MediaWiki
   4  */
   5
   6 /**
   7  * This is not a valid entry point, perform no further processing unless MEDIAWIKI is defined
   8  */
   9 if( defined( 'MEDIAWIKI' ) ) {
  10
  11 # See design.doc
  12
  13 if($wgUseTeX) require_once( 'Math.php' );
  14
  15 /**
  16  * @todo document
  17  * @package MediaWiki
  18  */
  19 class OutputPage {
  20         var $mHeaders, $mCookies, $mMetatags, $mKeywords;
  21         var $mLinktags, $mPagetitle, $mBodytext, $mDebugtext;
  22         var $mHTMLtitle, $mRobotpolicy, $mIsarticle, $mPrintable;
  23         var $mSubtitle, $mRedirect;
  24         var $mLastModified, $mCategoryLinks;
  25         var $mScripts, $mLinkColours;
  26
  27         var $mSuppressQuickbar;
  28         var $mOnloadHandler;
  29         var $mDoNothing;
  30         var $mContainsOldMagic, $mContainsNewMagic;
  31         var $mIsArticleRelated;
  32         var $mParserOptions;
  33         var $mShowFeedLinks = false;
  34         var $mEnableClientCache = true;
  35
  36         /**
  37          * Constructor
  38          * Initialise private variables
  39          */
  40         function OutputPage() {
  41                 $this->mHeaders = $this->mCookies = $this->mMetatags =
  42                 $this->mKeywords = $this->mLinktags = array();
  43                 $this->mHTMLtitle = $this->mPagetitle = $this->mBodytext =
  44                 $this->mRedirect = $this->mLastModified =
  45                 $this->mSubtitle = $this->mDebugtext = $this->mRobotpolicy =
  46                 $this->mOnloadHandler = '';
  47                 $this->mIsArticleRelated = $this->mIsarticle = $this->mPrintable = true;
  48                 $this->mSuppressQuickbar = $this->mPrintable = false;
  49                 $this->mLanguageLinks = array();
  50                 $this->mCategoryLinks = array() ;
  51                 $this->mDoNothing = false;
  52                 $this->mContainsOldMagic = $this->mContainsNewMagic = 0;
  53                 $this->mParserOptions = ParserOptions::newFromUser( $temp = NULL );
  54                 $this->mSquidMaxage = 0;
  55                 $this->mScripts = '';
  56         }
  57
  58         function addHeader( $name, $val ) { array_push( $this->mHeaders, $name.': '.$val ) ; }
  59         function addCookie( $name, $val ) { array_push( $this->mCookies, array( $name, $val ) ); }
  60         function redirect( $url, $responsecode = '302' ) { $this->mRedirect = $url; $this->mRedirectCode = $responsecode; }
  61
  62         # To add an http-equiv meta tag, precede the name with "http:"
  63         function addMeta( $name, $val ) { array_push( $this->mMetatags, array( $name, $val ) ); }
  64         function addKeyword( $text ) { array_push( $this->mKeywords, $text ); }
  65         function addScript( $script ) { $this->mScripts .= $script; }
  66         function getScript() { return $this->mScripts; }
  67
  68         function addLink( $linkarr ) {
  69                 # $linkarr should be an associative array of attributes. We'll escape on output.
  70                 array_push( $this->mLinktags, $linkarr );
  71         }
  72
  73         function addMetadataLink( $linkarr ) {
  74                 # note: buggy CC software only reads first "meta" link
  75                 static $haveMeta = false;
  76                 $linkarr['rel'] = ($haveMeta) ? 'alternate meta' : 'meta';
  77                 $this->addLink( $linkarr );
  78                 $haveMeta = true;
  79         }
  80
  81         /**
  82          * checkLastModified tells the client to use the client-cached page if
  83          * possible. If sucessful, the OutputPage is disabled so that
  84          * any future call to OutputPage->output() have no effect. The method
  85          * returns true iff cache-ok headers was sent.
  86          */
  87         function checkLastModified ( $timestamp ) {
  88                 global $wgLang, $wgCachePages, $wgUser;
  89                 if ( !$timestamp || $timestamp == '19700101000000' ) {
  90                         wfDebug( "CACHE DISABLED, NO TIMESTAMP\n" );
  91                         return;
  92                 }
  93                 if( !$wgCachePages ) {
  94                         wfDebug( "CACHE DISABLED\n", false );
  95                         return;
  96                 }
  97                 if( $wgUser->getOption( 'nocache' ) ) {
  98                         wfDebug( "USER DISABLED CACHE\n", false );
  99                         return;
 100                 }
 101
 102                 $timestamp=wfTimestamp(TS_MW,$timestamp);
 103                 $lastmod = wfTimestamp( TS_RFC2822, max( $timestamp, $wgUser->mTouched ) );
 104
 105                 if( !empty( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) ) {
 106                         # IE sends sizes after the date like this:
 107                         # Wed, 20 Aug 2003 06:51:19 GMT; length=5202
 108                         # this breaks strtotime().
 109                         $modsince = preg_replace( '/;.*$/', '', $_SERVER["HTTP_IF_MODIFIED_SINCE"] );
 110                         $ismodsince = wfTimestamp( TS_MW, strtotime( $modsince ) );
 111                         wfDebug( "-- client send If-Modified-Since: " . $modsince . "\n", false );
 112                         wfDebug( "--  we might send Last-Modified : $lastmod\n", false );
 113                         if( ($ismodsince >= $timestamp ) && $wgUser->validateCache( $ismodsince ) ) {
 114                                 # Make sure you're in a place you can leave when you call us!
 115                                 header( "HTTP/1.0 304 Not Modified" );
 116                                 $this->mLastModified = $lastmod;
 117                                 $this->sendCacheControl();
 118                                 wfDebug( "CACHED client: $ismodsince ; user: $wgUser->mTouched ; page: $timestamp\n", false );
 119                                 $this->disable();
 120                                 return true;
 121                         } else {
 122                                 wfDebug( "READY  client: $ismodsince ; user: $wgUser->mTouched ; page: $timestamp\n", false );
 123                                 $this->mLastModified = $lastmod;
 124                         }
 125                 } else {
 126                         wfDebug( "client did not send If-Modified-Since header\n", false );
 127                         $this->mLastModified = $lastmod;
 128                 }
 129         }
 130
 131         function getPageTitleActionText () {
 132                 global $action;
 133                 switch($action) {
 134                         case 'edit':
 135                                 return wfMsg('edit');
 136                         case 'history':
 137                                 return wfMsg('history_short');
 138                         case 'protect':
 139                                 return wfMsg('protect');
 140                         case 'unprotect':
 141                                 return wfMsg('unprotect');
 142                         case 'delete':
 143                                 return wfMsg('delete');
 144                         case 'watch':
 145                                 return wfMsg('watch');
 146                         case 'unwatch':
 147                                 return wfMsg('unwatch');
 148                         case 'submit':
 149                                 return wfMsg('preview');
 150                         case 'info':
 151                                 return wfMsg('info_short');
 152                         default:
 153                                 return '';
 154                 }
 155         }
 156
 157         function setRobotpolicy( $str ) { $this->mRobotpolicy = $str; }
 158         function setHTMLTitle( $name ) {$this->mHTMLtitle = $name; }
 159         function setPageTitle( $name ) {
 160                 global $action, $wgContLang;
 161                 $name = $wgContLang->convert($name, true);
 162                 $this->mPagetitle = $name;
 163                 if(!empty($action)) {
 164                         $taction =  $this->getPageTitleActionText();
 165                         if( !empty( $taction ) ) {
 166                                 $name .= ' - '.$taction;
 167                         }
 168                 }
 169                 $this->setHTMLTitle( $name . ' - ' . wfMsg( 'wikititlesuffix' ) );
 170         }
 171         function getHTMLTitle() { return $this->mHTMLtitle; }
 172         function getPageTitle() { return $this->mPagetitle; }
 173         function setSubtitle( $str ) { $this->mSubtitle = $str; }
 174         function getSubtitle() { return $this->mSubtitle; }
 175         function isArticle() { return $this->mIsarticle; }
 176         function setPrintable() { $this->mPrintable = true; }
 177         function isPrintable() { return $this->mPrintable; }
 178         function setSyndicated( $show = true ) { $this->mShowFeedLinks = $show; }
 179         function isSyndicated() { return $this->mShowFeedLinks; }
 180         function setOnloadHandler( $js ) { $this->mOnloadHandler = $js; }
 181         function getOnloadHandler() { return $this->mOnloadHandler; }
 182         function disable() { $this->mDoNothing = true; }
 183
 184         function setArticleRelated( $v ) {
 185                 $this->mIsArticleRelated = $v;
 186                 if ( !$v ) {
 187                         $this->mIsarticle = false;
 188                 }
 189         }
 190         function setArticleFlag( $v ) {
 191                 $this->mIsarticle = $v;
 192                 if ( $v ) {
 193                         $this->mIsArticleRelated = $v;
 194                 }
 195         }
 196
 197         function isArticleRelated() { return $this->mIsArticleRelated; }
 198
 199         function getLanguageLinks() { return $this->mLanguageLinks; }
 200         function addLanguageLinks($newLinkArray) {
 201                 $this->mLanguageLinks += $newLinkArray;
 202         }
 203         function setLanguageLinks($newLinkArray) {
 204                 $this->mLanguageLinks = $newLinkArray;
 205         }
 206
 207         function getCategoryLinks() {
 208                 return $this->mCategoryLinks;
 209         }
 210         function addCategoryLinks($newLinkArray) {
 211                 $this->mCategoryLinks += $newLinkArray;
 212         }
 213         function setCategoryLinks($newLinkArray) {
 214                 $this->mCategoryLinks += $newLinkArray;
 215         }
 216
 217         function suppressQuickbar() { $this->mSuppressQuickbar = true; }
 218         function isQuickbarSuppressed() { return $this->mSuppressQuickbar; }
 219
 220         function addHTML( $text ) { $this->mBodytext .= $text; }
 221         function clearHTML() { $this->mBodytext = ''; }
 222         function debug( $text ) { $this->mDebugtext .= $text; }
 223
 224         function setParserOptions( $options ) {
 225                 return wfSetVar( $this->mParserOptions, $options );
 226         }
 227
 228         /**
 229          * Convert wikitext to HTML and add it to the buffer
 230          */
 231         function addWikiText( $text, $linestart = true ) {
 232                 global $wgParser, $wgTitle, $wgUseTidy;
 233
 234                 $parserOutput = $wgParser->parse( $text, $wgTitle, $this->mParserOptions, $linestart );
 235                 $this->mLanguageLinks += $parserOutput->getLanguageLinks();
 236                 $this->mCategoryLinks += $parserOutput->getCategoryLinks();
 237                 $this->addHTML( $parserOutput->getText() );
 238         }
 239
 240         /**
 241          * Add wikitext to the buffer, assuming that this is the primary text for a page view
 242          * Saves the text into the parser cache if possible
 243          */
 244         function addPrimaryWikiText( $text, $cacheArticle ) {
 245                 global $wgParser, $wgParserCache, $wgUser, $wgTitle, $wgUseTidy;
 246
 247                 $parserOutput = $wgParser->parse( $text, $wgTitle, $this->mParserOptions, true );
 248
 249                 $text = $parserOutput->getText();
 250
 251                 if ( $cacheArticle ) {
 252                         $wgParserCache->save( $parserOutput, $cacheArticle, $wgUser );
 253                 }
 254
 255                 $this->mLanguageLinks += $parserOutput->getLanguageLinks();
 256                 $this->mCategoryLinks += $parserOutput->getCategoryLinks();
 257                 $this->addHTML( $text );
 258         }
 259
 260         /**
 261          * Add the output of a QuickTemplate to the output buffer
 262          * @param QuickTemplate $template
 263          */
 264         function addTemplate( &$template ) {
 265                 ob_start();
 266                 $template->execute();
 267                 $this->addHtml( ob_get_contents() );
 268                 ob_end_clean();
 269         }
 270
 271         /**
 272          * Parse wikitext and return the HTML. This is for special pages that add the text later
 273          */
 274         function parse( $text, $linestart = true ) {
 275                 global $wgParser, $wgTitle;
 276                 $parserOutput = $wgParser->parse( $text, $wgTitle, $this->mParserOptions, $linestart );
 277                 return $parserOutput->getText();
 278         }
 279
 280         /**
 281          * @param $article
 282          * @param $user
 283          */
 284         function tryParserCache( $article, $user ) {
 285                 global $wgParserCache;
 286                 $parserOutput = $wgParserCache->get( $article, $user );
 287                 if ( $parserOutput !== false ) {
 288                         $this->mLanguageLinks += $parserOutput->getLanguageLinks();
 289                         $this->mCategoryLinks += $parserOutput->getCategoryLinks();
 290                         $this->addHTML( $parserOutput->getText() );
 291                         return true;
 292                 } else {
 293                         return false;
 294                 }
 295         }
 296
 297         /**
 298          * Set the maximum cache time on the Squid in seconds
 299          * @param $maxage
 300          */
 301         function setSquidMaxage( $maxage ) {
 302                 $this->mSquidMaxage = $maxage;
 303         }
 304
 305         /**
 306          * Use enableClientCache(false) to force it to send nocache headers
 307          * @param $state
 308          */
 309         function enableClientCache( $state ) {
 310                 return wfSetVar( $this->mEnableClientCache, $state );
 311         }
 312
 313         function sendCacheControl() {
 314                 global $wgUseSquid, $wgUseESI;
 315                 # don't serve compressed data to clients who can't handle it
 316                 # maintain different caches for logged-in users and non-logged in ones
 317                 header( 'Vary: Accept-Encoding, Cookie' );
 318                 if( $this->mEnableClientCache ) {
 319                         if( $wgUseSquid && ! isset( $_COOKIE[ini_get( 'session.name') ] ) &&
 320                           ! $this->isPrintable() && $this->mSquidMaxage != 0 )
 321                         {
 322                                 if ( $wgUseESI ) {
 323                                         # We'll purge the proxy cache explicitly, but require end user agents
 324                                         # to revalidate against the proxy on each visit.
 325                                         # Surrogate-Control controls our Squid, Cache-Control downstream caches
 326                                         wfDebug( "** proxy caching with ESI; {$this->mLastModified} **\n", false );
 327                                         # start with a shorter timeout for initial testing
 328                                         # header( 'Surrogate-Control: max-age=2678400+2678400, content="ESI/1.0"');
 329                                         header( 'Surrogate-Control: max-age='.$wgSquidMaxage.'+'.$this->mSquidMaxage.', content="ESI/1.0"');
 330                                         header( 'Cache-Control: s-maxage=0, must-revalidate, max-age=0' );
 331                                 } else {
 332                                         # We'll purge the proxy cache for anons explicitly, but require end user agents
 333                                         # to revalidate against the proxy on each visit.
 334                                         # IMPORTANT! The Squid needs to replace the Cache-Control header with
 335                                         # Cache-Control: s-maxage=0, must-revalidate, max-age=0
 336                                         wfDebug( "** local proxy caching; {$this->mLastModified} **\n", false );
 337                                         # start with a shorter timeout for initial testing
 338                                         # header( "Cache-Control: s-maxage=2678400, must-revalidate, max-age=0" );
 339                                         header( 'Cache-Control: s-maxage='.$this->mSquidMaxage.', must-revalidate, max-age=0' );
 340                                 }
 341                         } else {
 342                                 # We do want clients to cache if they can, but they *must* check for updates
 343                                 # on revisiting the page.
 344                                 wfDebug( "** private caching; {$this->mLastModified} **\n", false );
 345                                 header( "Expires: -1" );
 346                                 header( "Cache-Control: private, must-revalidate, max-age=0" );
 347                         }
 348                         if($this->mLastModified) header( "Last-modified: {$this->mLastModified}" );
 349                 } else {
 350                         wfDebug( "** no caching **\n", false );
 351
 352                         # In general, the absence of a last modified header should be enough to prevent
 353                         # the client from using its cache. We send a few other things just to make sure.
 354                         header( 'Expires: -1' );
 355                         header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
 356                         header( 'Pragma: no-cache' );
 357                 }
 358         }
 359
 360         /**
 361          * Finally, all the text has been munged and accumulated into
 362          * the object, let's actually output it:
 363          */
 364         function output() {
 365                 global $wgUser, $wgLang, $wgDebugComments, $wgCookieExpiration;
 366                 global $wgInputEncoding, $wgOutputEncoding, $wgContLanguageCode;
 367                 global $wgDebugRedirects, $wgMimeType, $wgProfiler;
 368
 369                 if( $this->mDoNothing ){
 370                         return;
 371                 }
 372                 $fname = 'OutputPage::output';
 373                 wfProfileIn( $fname );
 374                 $sk = $wgUser->getSkin();
 375
 376                 if ( '' != $this->mRedirect ) {
 377                         if( substr( $this->mRedirect, 0, 4 ) != 'http' ) {
 378                                 # Standards require redirect URLs to be absolute
 379                                 global $wgServer;
 380                                 $this->mRedirect = $wgServer . $this->mRedirect;
 381                         }
 382                         if( $this->mRedirectCode == '301') {
 383                                 if( !$wgDebugRedirects ) {
 384                                         header("HTTP/1.1 {$this->mRedirectCode} Moved Permanently");
 385                                 }
 386                                 $this->mLastModified = wfTimestamp( TS_RFC2822 );
 387                         }
 388
 389                         $this->sendCacheControl();
 390
 391                         if( $wgDebugRedirects ) {
 392                                 $url = htmlspecialchars( $this->mRedirect );
 393                                 print "<html>\n<head>\n<title>Redirect</title>\n</head>\n<body>\n";
 394                                 print "<p>Location: <a href=\"$url\">$url</a></p>\n";
 395                                 print "</body>\n</html>\n";
 396                         } else {
 397                                 header( 'Location: '.$this->mRedirect );
 398                         }
 399                         if ( isset( $wgProfiler ) ) { wfDebug( $wgProfiler->getOutput() ); }
 400                         return;
 401                 }
 402
 403
 404                 # Buffer output; final headers may depend on later processing
 405                 ob_start();
 406
 407                 $this->transformBuffer();
 408
 409                 # Disable temporary placeholders, so that the skin produces HTML
 410                 $sk->postParseLinkColour( false );
 411
 412                 header( "Content-type: $wgMimeType; charset={$wgOutputEncoding}" );
 413                 header( 'Content-language: '.$wgContLanguageCode );
 414
 415                 $exp = time() + $wgCookieExpiration;
 416                 foreach( $this->mCookies as $name => $val ) {
 417                         setcookie( $name, $val, $exp, '/' );
 418                 }
 419
 420                 wfProfileIn( 'Output-skin' );
 421                 $sk->outputPage( $this );
 422                 wfProfileOut( 'Output-skin' );
 423
 424                 $this->sendCacheControl();
 425                 ob_end_flush();
 426         }
 427
 428         function out( $ins ) {
 429                 global $wgInputEncoding, $wgOutputEncoding, $wgContLang;
 430                 if ( 0 == strcmp( $wgInputEncoding, $wgOutputEncoding ) ) {
 431                         $outs = $ins;
 432                 } else {
 433                         $outs = $wgContLang->iconv( $wgInputEncoding, $wgOutputEncoding, $ins );
 434                         if ( false === $outs ) { $outs = $ins; }
 435                 }
 436                 print $outs;
 437         }
 438
 439         function setEncodings() {
 440                 global $wgInputEncoding, $wgOutputEncoding;
 441                 global $wgUser, $wgContLang;
 442
 443                 $wgInputEncoding = strtolower( $wgInputEncoding );
 444
 445                 if( $wgUser->getOption( 'altencoding' ) ) {
 446                         $wgContLang->setAltEncoding();
 447                         return;
 448                 }
 449
 450                 if ( empty( $_SERVER['HTTP_ACCEPT_CHARSET'] ) ) {
 451                         $wgOutputEncoding = strtolower( $wgOutputEncoding );
 452                         return;
 453                 }
 454
 455                 /*
 456                 # This code is unused anyway!
 457                 # Commenting out. --bv 2003-11-15
 458
 459                 $a = explode( ",", $_SERVER['HTTP_ACCEPT_CHARSET'] );
 460                 $best = 0.0;
 461                 $bestset = "*";
 462
 463                 foreach ( $a as $s ) {
 464                         if ( preg_match( "/(.*);q=(.*)/", $s, $m ) ) {
 465                                 $set = $m[1];
 466                                 $q = (float)($m[2]);
 467                         } else {
 468                                 $set = $s;
 469                                 $q = 1.0;
 470                         }
 471                         if ( $q > $best ) {
 472                                 $bestset = $set;
 473                                 $best = $q;
 474                         }
 475                 }
 476                 #if ( "*" == $bestset ) { $bestset = "iso-8859-1"; }
 477                 if ( "*" == $bestset ) { $bestset = $wgOutputEncoding; }
 478                 $wgOutputEncoding = strtolower( $bestset );
 479
 480 # Disable for now
 481 #
 482                 */
 483                 $wgOutputEncoding = $wgInputEncoding;
 484         }
 485
 486         /**
 487          * Returns a HTML comment with the elapsed time since request.
 488          * This method has no side effects.
 489          */
 490         function reportTime() {
 491                 global $wgRequestTime;
 492
 493                 $now = wfTime();
 494                 list( $usec, $sec ) = explode( ' ', $wgRequestTime );
 495                 $start = (float)$sec + (float)$usec;
 496                 $elapsed = $now - $start;
 497
 498                 # Use real server name if available, so we know which machine
 499                 # in a server farm generated the current page.
 500                 if ( function_exists( 'posix_uname' ) ) {
 501                         $uname = @posix_uname();
 502                 } else {
 503                         $uname = false;
 504                 }
 505                 if( is_array( $uname ) && isset( $uname['nodename'] ) ) {
 506                         $hostname = $uname['nodename'];
 507                 } else {
 508                         # This may be a virtual server.
 509                         $hostname = $_SERVER['SERVER_NAME'];
 510                 }
 511                 $com = sprintf( "<!-- Served by %s in %01.2f secs. -->",
 512                   $hostname, $elapsed );
 513                 return $com;
 514         }
 515
 516         /**
 517          * Note: these arguments are keys into wfMsg(), not text!
 518          */
 519         function errorpage( $title, $msg ) {
 520                 global $wgTitle;
 521
 522                 $this->mDebugtext .= 'Original title: ' .
 523                   $wgTitle->getPrefixedText() . "\n";
 524                 $this->setPageTitle( wfMsg( $title ) );
 525                 $this->setHTMLTitle( wfMsg( 'errorpagetitle' ) );
 526                 $this->setRobotpolicy( 'noindex,nofollow' );
 527                 $this->setArticleRelated( false );
 528                 $this->enableClientCache( false );
 529                 $this->mRedirect = '';
 530
 531                 $this->mBodytext = '';
 532                 $this->addHTML( '<p>' . wfMsg( $msg ) . "</p>\n" );
 533                 $this->returnToMain( false );
 534
 535                 $this->output();
 536                 wfErrorExit();
 537         }
 538
 539         function sysopRequired() {
 540                 global $wgUser;
 541
 542                 $this->setPageTitle( wfMsg( 'sysoptitle' ) );
 543                 $this->setHTMLTitle( wfMsg( 'errorpagetitle' ) );
 544                 $this->setRobotpolicy( 'noindex,nofollow' );
 545                 $this->setArticleRelated( false );
 546                 $this->mBodytext = '';
 547
 548                 $sk = $wgUser->getSkin();
 549                 $ap = $sk->makeKnownLink( wfMsgForContent( 'administrators' ), '' );
 550                 $this->addHTML( wfMsg( 'sysoptext', $ap ) );
 551                 $this->returnToMain();
 552         }
 553
 554         function developerRequired() {
 555                 global $wgUser;
 556
 557                 $this->setPageTitle( wfMsg( 'developertitle' ) );
 558                 $this->setHTMLTitle( wfMsg( 'errorpagetitle' ) );
 559                 $this->setRobotpolicy( 'noindex,nofollow' );
 560                 $this->setArticleRelated( false );
 561                 $this->mBodytext = '';
 562
 563                 $sk = $wgUser->getSkin();
 564                 $ap = $sk->makeKnownLink( wfMsgForContent( 'administrators' ), '' );
 565                 $this->addHTML( wfMsg( 'developertext', $ap ) );
 566                 $this->returnToMain();
 567         }
 568
 569         function loginToUse() {
 570                 global $wgUser, $wgTitle, $wgContLang;
 571
 572                 $this->setPageTitle( wfMsg( 'loginreqtitle' ) );
 573                 $this->setHTMLTitle( wfMsg( 'errorpagetitle' ) );
 574                 $this->setRobotpolicy( 'noindex,nofollow' );
 575                 $this->setArticleFlag( false );
 576                 $this->mBodytext = '';
 577                 $this->addWikiText( wfMsg( 'loginreqtext' ) );
 578
 579                 # We put a comment in the .html file so a Sysop can diagnose the page the
 580                 # user can't see.
 581                 $this->addHTML( "\n<!--" .
 582                                                 $wgContLang->getNsText( $wgTitle->getNamespace() ) .
 583                                                 ':' .
 584                                                 $wgTitle->getDBkey() . '-->' );
 585                 $this->returnToMain();          # Flip back to the main page after 10 seconds.
 586         }
 587
 588         function databaseError( $fname, $sql, $error, $errno ) {
 589                 global $wgUser, $wgCommandLineMode, $wgShowSQLErrors;
 590
 591                 $this->setPageTitle( wfMsgNoDB( 'databaseerror' ) );
 592                 $this->setRobotpolicy( 'noindex,nofollow' );
 593                 $this->setArticleRelated( false );
 594                 $this->enableClientCache( false );
 595                 $this->mRedirect = '';
 596
 597                 if( $wgShowSQLErrors ) {
 598                         if ( $wgCommandLineMode ) {
 599                                 $msg = wfMsgNoDB( 'dberrortextcl', htmlspecialchars( $sql ),
 600                                                         htmlspecialchars( $fname ), $errno, htmlspecialchars( $error ) );
 601                         } else {
 602                                 $msg = wfMsgNoDB( 'dberrortext', htmlspecialchars( $sql ),
 603                                                         htmlspecialchars( $fname ), $errno, htmlspecialchars( $error ) );
 604                         }
 605                 } else {
 606                         if( $wgCommandLineMode ) {
 607                                 $msg = wfMsg( 'internalerror' );
 608                         } else {
 609                                 $msg = htmlspecialchars( wfMsg( 'internalerror' ) );
 610                         }
 611                 }
 612
 613                 if ( $wgCommandLineMode || !is_object( $wgUser )) {
 614                         print $msg."\n";
 615                         wfErrorExit();
 616                 }
 617                 $this->mBodytext = $msg;
 618                 $this->output();
 619                 wfErrorExit();
 620         }
 621
 622         function readOnlyPage( $source = null, $protected = false ) {
 623                 global $wgUser, $wgReadOnlyFile;
 624
 625                 $this->setRobotpolicy( 'noindex,nofollow' );
 626                 $this->setArticleRelated( false );
 627
 628                 if( $protected ) {
 629                         $this->setPageTitle( wfMsg( 'viewsource' ) );
 630                         $this->addWikiText( wfMsg( 'protectedtext' ) );
 631                 } else {
 632                         $this->setPageTitle( wfMsg( 'readonly' ) );
 633                         $reason = file_get_contents( $wgReadOnlyFile );
 634                         $this->addWikiText( wfMsg( 'readonlytext', $reason ) );
 635                 }
 636
 637                 if( is_string( $source ) ) {
 638                         if( strcmp( $source, '' ) == 0 ) {
 639                                 $source = wfMsg( 'noarticletext' );
 640                         }
 641                         $rows = $wgUser->getOption( 'rows' );
 642                         $cols = $wgUser->getOption( 'cols' );
 643                         $text = "\n<textarea cols='$cols' rows='$rows' readonly='readonly'>" .
 644                                 htmlspecialchars( $source ) . "\n</textarea>";
 645                         $this->addHTML( $text );
 646                 }
 647
 648                 $this->returnToMain( false );
 649         }
 650
 651         function fatalError( $message ) {
 652                 $this->setPageTitle( wfMsg( "internalerror" ) );
 653                 $this->setRobotpolicy( "noindex,nofollow" );
 654                 $this->setArticleRelated( false );
 655                 $this->enableClientCache( false );
 656                 $this->mRedirect = '';
 657
 658                 $this->mBodytext = $message;
 659                 $this->output();
 660                 wfErrorExit();
 661         }
 662
 663         function unexpectedValueError( $name, $val ) {
 664                 $this->fatalError( wfMsg( 'unexpected', $name, $val ) );
 665         }
 666
 667         function fileCopyError( $old, $new ) {
 668                 $this->fatalError( wfMsg( 'filecopyerror', $old, $new ) );
 669         }
 670
 671         function fileRenameError( $old, $new ) {
 672                 $this->fatalError( wfMsg( 'filerenameerror', $old, $new ) );
 673         }
 674
 675         function fileDeleteError( $name ) {
 676                 $this->fatalError( wfMsg( 'filedeleteerror', $name ) );
 677         }
 678
 679         function fileNotFoundError( $name ) {
 680                 $this->fatalError( wfMsg( 'filenotfound', $name ) );
 681         }
 682
 683         /**
 684          * return from error messages or notes
 685          * @param $auto automatically redirect the user after 10 seconds
 686          * @param $returnto page title to return to. Default is Main Page.
 687          */
 688         function returnToMain( $auto = true, $returnto = NULL ) {
 689                 global $wgUser, $wgOut, $wgRequest;
 690
 691                 if ( $returnto == NULL ) {
 692                         $returnto = $wgRequest->getText( 'returnto' );
 693                 }
 694                 $returnto = htmlspecialchars( $returnto );
 695
 696                 $sk = $wgUser->getSkin();
 697                 if ( '' == $returnto ) {
 698                         $returnto = wfMsgForContent( 'mainpage' );
 699                 }
 700                 $link = $sk->makeKnownLink( $returnto, '' );
 701
 702                 $r = wfMsg( 'returnto', $link );
 703                 if ( $auto ) {
 704                         $titleObj = Title::newFromText( $returnto );
 705                         $wgOut->addMeta( 'http:Refresh', '10;url=' . $titleObj->escapeFullURL() );
 706                 }
 707                 $wgOut->addHTML( "\n<p>$r</p>\n" );
 708         }
 709
 710         /**
 711          * This function takes the existing and broken links for the page
 712          * and uses the first 10 of them for META keywords
 713          */
 714         function addMetaTags () {
 715                 global $wgLinkCache , $wgOut ;
 716                 $good = array_keys ( $wgLinkCache->mGoodLinks ) ;
 717                 $bad = array_keys ( $wgLinkCache->mBadLinks ) ;
 718                 $a = array_merge ( $good , $bad ) ;
 719                 $a = array_slice ( $a , 0 , 10 ) ; # 10 keywords max
 720                 $a = implode ( ',' , $a ) ;
 721                 $strip = array(
 722                         "/<.*?" . ">/" => '',
 723                         "/[_]/" => ' '
 724                 );
 725                 $a = htmlspecialchars(preg_replace(array_keys($strip), array_values($strip),$a ));
 726
 727                 $wgOut->addMeta ( 'KEYWORDS' , $a ) ;
 728         }
 729
 730         /**
 731          * @private
 732          */
 733         function headElement() {
 734                 global $wgDocType, $wgDTD, $wgContLanguageCode, $wgOutputEncoding, $wgMimeType;
 735                 global $wgUser, $wgContLang, $wgRequest;
 736
 737                 if( $wgMimeType == 'text/xml' || $wgMimeType == 'application/xhtml+xml' || $wgMimeType == 'application/xml' ) {
 738                         $ret = "<" . "?xml version=\"1.0\" encoding=\"$wgOutputEncoding\" ?" . ">\n";
 739                 } else {
 740                         $ret = '';
 741                 }
 742
 743                 $ret .= "<!DOCTYPE html PUBLIC \"$wgDocType\"\n        \"$wgDTD\">\n";
 744
 745                 if ( "" == $this->mHTMLtitle ) {
 746                         $this->mHTMLtitle = wfMsg( "pagetitle", $this->mPagetitle );
 747                 }
 748
 749                 $rtl = $wgContLang->isRTL() ? " dir='RTL'" : '';
 750                 $ret .= "<html xmlns=\"http://www.w3.org/1999/xhtml\" xml:lang=\"$wgContLanguageCode\" lang=\"$wgContLanguageCode\" $rtl>\n";
 751                 $ret .= "<head>\n<title>" . htmlspecialchars( $this->mHTMLtitle ) . "</title>\n";
 752                 array_push( $this->mMetatags, array( "http:Content-type", "$wgMimeType; charset={$wgOutputEncoding}" ) );
 753
 754                 $ret .= $this->getHeadLinks();
 755                 global $wgStylePath;
 756                 if( $this->isPrintable() ) {
 757                         $media = '';
 758                 } else {
 759                         $media = "media='print'";
 760                 }
 761                 $printsheet = htmlspecialchars( "$wgStylePath/common/wikiprintable.css" );
 762                 $ret .= "<link rel='stylesheet' type='text/css' $media href='$printsheet' />\n";
 763
 764                 $sk = $wgUser->getSkin();
 765                 $ret .= $sk->getHeadScripts();
 766                 $ret .= $this->mScripts;
 767                 $ret .= $sk->getUserStyles();
 768
 769                 $ret .= "</head>\n";
 770                 return $ret;
 771         }
 772
 773         function getHeadLinks() {
 774                 global $wgRequest, $wgStylePath;
 775                 $ret = '';
 776                 foreach ( $this->mMetatags as $tag ) {
 777                         if ( 0 == strcasecmp( 'http:', substr( $tag[0], 0, 5 ) ) ) {
 778                                 $a = 'http-equiv';
 779                                 $tag[0] = substr( $tag[0], 5 );
 780                         } else {
 781                                 $a = 'name';
 782                         }
 783                         $ret .= "<meta $a=\"{$tag[0]}\" content=\"{$tag[1]}\" />\n";
 784                 }
 785                 $p = $this->mRobotpolicy;
 786                 if ( '' == $p ) { $p = 'index,follow'; }
 787                 $ret .= "<meta name=\"robots\" content=\"$p\" />\n";
 788
 789                 if ( count( $this->mKeywords ) > 0 ) {
 790                         $strip = array(
 791                                 "/<.*?" . ">/" => '',
 792                                 "/[_]/" => ' '
 793                         );
 794                         $ret .= "<meta name=\"keywords\" content=\"" .
 795                           htmlspecialchars(preg_replace(array_keys($strip), array_values($strip),implode( ",", $this->mKeywords ))) . "\" />\n";
 796                 }
 797                 foreach ( $this->mLinktags as $tag ) {
 798                         $ret .= '<link';
 799                         foreach( $tag as $attr => $val ) {
 800                                 $ret .= " $attr=\"" . htmlspecialchars( $val ) . "\"";
 801                         }
 802                         $ret .= " />\n";
 803                 }
 804                 if( $this->isSyndicated() ) {
 805                         # FIXME: centralize the mime-type and name information in Feed.php
 806                         $link = $wgRequest->escapeAppendQuery( 'feed=rss' );
 807                         $ret .= "<link rel='alternate' type='application/rss+xml' title='RSS 2.0' href='$link' />\n";
 808                         $link = $wgRequest->escapeAppendQuery( 'feed=atom' );
 809                         $ret .= "<link rel='alternate' type='application/rss+atom' title='Atom 0.3' href='$link' />\n";
 810                 }
 811
 812                 return $ret;
 813         }
 814
 815         /**
 816          * Run any necessary pre-output transformations on the buffer text
 817          */
 818         function transformBuffer( $options = 0 ) {
 819         }
 820
 821
 822 }
 823
 824 }
 825
 826 ?>