includes/OutputPage.php

   1 <?php
   2 /**
   3  * @version $Id$
   4  * @package MediaWiki
   5  */
   6
   7 /**
   8  * This is not a valid entry point, perform no further processing unless MEDIAWIKI is defined
   9  */
  10 if( defined( 'MEDIAWIKI' ) ) {
  11
  12 # See design.doc
  13
  14 if($wgUseTeX) require_once( 'Math.php' );
  15
  16 define( 'RLH_FOR_UPDATE', 1 );
  17
  18 /**
  19  * @todo document
  20  * @package MediaWiki
  21  */
  22 class OutputPage {
  23         var $mHeaders, $mCookies, $mMetatags, $mKeywords;
  24         var $mLinktags, $mPagetitle, $mBodytext, $mDebugtext;
  25         var $mHTMLtitle, $mRobotpolicy, $mIsarticle, $mPrintable;
  26         var $mSubtitle, $mRedirect;
  27         var $mLastModified, $mCategoryLinks;
  28         var $mScripts, $mLinkColours;
  29
  30         var $mSuppressQuickbar;
  31         var $mOnloadHandler;
  32         var $mDoNothing;
  33         var $mContainsOldMagic, $mContainsNewMagic;
  34         var $mIsArticleRelated;
  35         var $mParserOptions;
  36         var $mShowFeedLinks = false;
  37         var $mEnableClientCache = true;
  38
  39         /**
  40          * Constructor
  41          * Initialise private variables
  42          */
  43         function OutputPage() {
  44                 $this->mHeaders = $this->mCookies = $this->mMetatags =
  45                 $this->mKeywords = $this->mLinktags = array();
  46                 $this->mHTMLtitle = $this->mPagetitle = $this->mBodytext =
  47                 $this->mRedirect = $this->mLastModified =
  48                 $this->mSubtitle = $this->mDebugtext = $this->mRobotpolicy =
  49                 $this->mOnloadHandler = '';
  50                 $this->mIsArticleRelated = $this->mIsarticle = $this->mPrintable = true;
  51                 $this->mSuppressQuickbar = $this->mPrintable = false;
  52                 $this->mLanguageLinks = array();
  53                 $this->mCategoryLinks = array() ;
  54                 $this->mDoNothing = false;
  55                 $this->mContainsOldMagic = $this->mContainsNewMagic = 0;
  56                 $this->mParserOptions = ParserOptions::newFromUser( $temp = NULL );
  57                 $this->mSquidMaxage = 0;
  58                 $this->mScripts = '';
  59         }
  60
  61         function addHeader( $name, $val ) { array_push( $this->mHeaders, $name.': '.$val ) ; }
  62         function addCookie( $name, $val ) { array_push( $this->mCookies, array( $name, $val ) ); }
  63         function redirect( $url, $responsecode = '302' ) { $this->mRedirect = $url; $this->mRedirectCode = $responsecode; }
  64
  65         # To add an http-equiv meta tag, precede the name with "http:"
  66         function addMeta( $name, $val ) { array_push( $this->mMetatags, array( $name, $val ) ); }
  67         function addKeyword( $text ) { array_push( $this->mKeywords, $text ); }
  68         function addScript( $script ) { $this->mScripts .= $script; }
  69         function getScript() { return $this->mScripts; }
  70
  71         function addLink( $linkarr ) {
  72                 # $linkarr should be an associative array of attributes. We'll escape on output.
  73                 array_push( $this->mLinktags, $linkarr );
  74         }
  75
  76         function addMetadataLink( $linkarr ) {
  77                 # note: buggy CC software only reads first "meta" link
  78                 static $haveMeta = false;
  79                 $linkarr['rel'] = ($haveMeta) ? 'alternate meta' : 'meta';
  80                 $this->addLink( $linkarr );
  81                 $haveMeta = true;
  82         }
  83
  84         /**
  85          * checkLastModified tells the client to use the client-cached page if
  86          * possible. If sucessful, the OutputPage is disabled so that
  87          * any future call to OutputPage->output() have no effect. The method
  88          * returns true iff cache-ok headers was sent.
  89          */
  90         function checkLastModified ( $timestamp ) {
  91                 global $wgLang, $wgCachePages, $wgUser;
  92                 $timestamp=wfTimestamp(TS_MW,$timestamp);
  93                 if( !$wgCachePages ) {
  94                         wfDebug( "CACHE DISABLED\n", false );
  95                         return;
  96                 }
  97                 if( preg_match( '/MSIE ([1-4]|5\.0)/', $_SERVER["HTTP_USER_AGENT"] ) ) {
  98                         # IE 5.0 has probs with our caching
  99                         wfDebug( "-- bad client, not caching\n", false );
 100                         return;
 101                 }
 102                 if( $wgUser->getOption( 'nocache' ) ) {
 103                         wfDebug( "USER DISABLED CACHE\n", false );
 104                         return;
 105                 }
 106
 107                 $lastmod = gmdate( 'D, j M Y H:i:s', wfTimestamp(TS_UNIX, max( $timestamp, $wgUser->mTouched ) ) ) . ' GMT';
 108
 109                 if( !empty( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) ) {
 110                         # IE sends sizes after the date like this:
 111                         # Wed, 20 Aug 2003 06:51:19 GMT; length=5202
 112                         # this breaks strtotime().
 113                         $modsince = preg_replace( '/;.*$/', '', $_SERVER["HTTP_IF_MODIFIED_SINCE"] );
 114                         $ismodsince = wfTimestamp( TS_MW, strtotime( $modsince ) );
 115                         wfDebug( "-- client send If-Modified-Since: " . $modsince . "\n", false );
 116                         wfDebug( "--  we might send Last-Modified : $lastmod\n", false );
 117                         if( ($ismodsince >= $timestamp ) and $wgUser->validateCache( $ismodsince ) ) {
 118                                 # Make sure you're in a place you can leave when you call us!
 119                                 header( "HTTP/1.0 304 Not Modified" );
 120                                 $this->mLastModified = $lastmod;
 121                                 $this->sendCacheControl();
 122                                 wfDebug( "CACHED client: $ismodsince ; user: $wgUser->mTouched ; page: $timestamp\n", false );
 123                                 $this->disable();
 124                                 return true;
 125                         } else {
 126                                 wfDebug( "READY  client: $ismodsince ; user: $wgUser->mTouched ; page: $timestamp\n", false );
 127                                 $this->mLastModified = $lastmod;
 128                         }
 129                 } else {
 130                         wfDebug( "We're confused.\n", false );
 131                         $this->mLastModified = $lastmod;
 132                 }
 133         }
 134
 135         function getPageTitleActionText () {
 136                 global $action;
 137                 switch($action) {
 138                         case 'edit':
 139                                 return wfMsg('edit');
 140                         case 'history':
 141                                 return wfMsg('history_short');
 142                         case 'protect':
 143                                 return wfMsg('protect');
 144                         case 'unprotect':
 145                                 return wfMsg('unprotect');
 146                         case 'delete':
 147                                 return wfMsg('delete');
 148                         case 'watch':
 149                                 return wfMsg('watch');
 150                         case 'unwatch':
 151                                 return wfMsg('unwatch');
 152                         case 'submit':
 153                                 return wfMsg('preview');
 154                         case 'info':
 155                                 return wfMsg('info_short');
 156                         default:
 157                                 return '';
 158                 }
 159         }
 160
 161         function setRobotpolicy( $str ) { $this->mRobotpolicy = $str; }
 162         function setHTMLTitle( $name ) {$this->mHTMLtitle = $name; }
 163         function setPageTitle( $name ) {
 164                 global $action;
 165                 $this->mPagetitle = $name;
 166                 if(!empty($action)) {
 167                         $taction =  $this->getPageTitleActionText();
 168                         if( !empty( $taction ) ) {
 169                                 $name .= ' - '.$taction;
 170                         }
 171                 }
 172                 $this->setHTMLTitle( $name . ' - ' . wfMsg( 'wikititlesuffix' ) );
 173         }
 174         function getHTMLTitle() { return $this->mHTMLtitle; }
 175         function getPageTitle() { return $this->mPagetitle; }
 176         function setSubtitle( $str ) { $this->mSubtitle = $str; }
 177         function getSubtitle() { return $this->mSubtitle; }
 178         function isArticle() { return $this->mIsarticle; }
 179         function setPrintable() { $this->mPrintable = true; }
 180         function isPrintable() { return $this->mPrintable; }
 181         function setSyndicated( $show = true ) { $this->mShowFeedLinks = $show; }
 182         function isSyndicated() { return $this->mShowFeedLinks; }
 183         function setOnloadHandler( $js ) { $this->mOnloadHandler = $js; }
 184         function getOnloadHandler() { return $this->mOnloadHandler; }
 185         function disable() { $this->mDoNothing = true; }
 186
 187         function setArticleRelated( $v ) {
 188                 $this->mIsArticleRelated = $v;
 189                 if ( !$v ) {
 190                         $this->mIsarticle = false;
 191                 }
 192         }
 193         function setArticleFlag( $v ) {
 194                 $this->mIsarticle = $v;
 195                 if ( $v ) {
 196                         $this->mIsArticleRelated = $v;
 197                 }
 198         }
 199
 200         function isArticleRelated() { return $this->mIsArticleRelated; }
 201
 202         function getLanguageLinks() { return $this->mLanguageLinks; }
 203         function addLanguageLinks($newLinkArray) {
 204                 $this->mLanguageLinks += $newLinkArray;
 205         }
 206         function setLanguageLinks($newLinkArray) {
 207                 $this->mLanguageLinks = $newLinkArray;
 208         }
 209
 210         function getCategoryLinks() {
 211                 return $this->mCategoryLinks;
 212         }
 213         function addCategoryLinks($newLinkArray) {
 214                 $this->mCategoryLinks += $newLinkArray;
 215         }
 216         function setCategoryLinks($newLinkArray) {
 217                 $this->mCategoryLinks += $newLinkArray;
 218         }
 219
 220         function suppressQuickbar() { $this->mSuppressQuickbar = true; }
 221         function isQuickbarSuppressed() { return $this->mSuppressQuickbar; }
 222
 223         function addHTML( $text ) { $this->mBodytext .= $text; }
 224         function clearHTML() { $this->mBodytext = ''; }
 225         function debug( $text ) { $this->mDebugtext .= $text; }
 226
 227         function setParserOptions( $options ) {
 228                 return wfSetVar( $this->mParserOptions, $options );
 229         }
 230
 231         /**
 232          * Convert wikitext to HTML and add it to the buffer
 233          */
 234         function addWikiText( $text, $linestart = true ) {
 235                 global $wgParser, $wgTitle;
 236
 237                 $parserOutput = $wgParser->parse( $text, $wgTitle, $this->mParserOptions, $linestart );
 238                 $this->mLanguageLinks += $parserOutput->getLanguageLinks();
 239                 $this->mCategoryLinks += $parserOutput->getCategoryLinks();
 240                 $this->addHTML( $parserOutput->getText() );
 241         }
 242
 243         /**
 244          * Add wikitext to the buffer, assuming that this is the primary text for a page view
 245          * Saves the text into the parser cache if possible
 246          */
 247         function addPrimaryWikiText( $text, $cacheArticle ) {
 248                 global $wgParser, $wgParserCache, $wgUser, $wgTitle;
 249
 250                 $parserOutput = $wgParser->parse( $text, $wgTitle, $this->mParserOptions, true );
 251
 252                 # Replace link holders
 253                 $text = $parserOutput->getText();
 254                 $this->replaceLinkHolders( $text );
 255                 $parserOutput->setText( $text );
 256
 257                 if ( $cacheArticle ) {
 258                         $wgParserCache->save( $parserOutput, $cacheArticle, $wgUser );
 259                 }
 260
 261                 $this->mLanguageLinks += $parserOutput->getLanguageLinks();
 262                 $this->mCategoryLinks += $parserOutput->getCategoryLinks();
 263                 $this->addHTML( $text );
 264         }
 265
 266         /**
 267          * @param $article
 268          * @param $user
 269          */
 270         function tryParserCache( $article, $user ) {
 271                 global $wgParserCache;
 272                 $parserOutput = $wgParserCache->get( $article, $user );
 273                 if ( $parserOutput !== false ) {
 274                         $this->mLanguageLinks += $parserOutput->getLanguageLinks();
 275                         $this->mCategoryLinks += $parserOutput->getCategoryLinks();
 276                         $this->addHTML( $parserOutput->getText() );
 277                         return true;
 278                 } else {
 279                         return false;
 280                 }
 281         }
 282
 283         /**
 284          * Set the maximum cache time on the Squid in seconds
 285          * @param $maxage
 286          */
 287         function setSquidMaxage( $maxage ) {
 288                 $this->mSquidMaxage = $maxage;
 289         }
 290
 291         /**
 292          * Use enableClientCache(false) to force it to send nocache headers
 293          * @param $state
 294          */
 295         function enableClientCache( $state ) {
 296                 return wfSetVar( $this->mEnableClientCache, $state );
 297         }
 298
 299         function sendCacheControl() {
 300                 global $wgUseSquid, $wgUseESI;
 301                 # FIXME: This header may cause trouble with some versions of Internet Explorer
 302                 header( 'Vary: Accept-Encoding, Cookie' );
 303                 if( $this->mEnableClientCache ) {
 304                         if( $wgUseSquid && ! isset( $_COOKIE[ini_get( 'session.name') ] ) &&
 305                           ! $this->isPrintable() && $this->mSquidMaxage != 0 )
 306                         {
 307                                 if ( $wgUseESI ) {
 308                                         # We'll purge the proxy cache explicitly, but require end user agents
 309                                         # to revalidate against the proxy on each visit.
 310                                         # Surrogate-Control controls our Squid, Cache-Control downstream caches
 311                                         wfDebug( "** proxy caching with ESI; {$this->mLastModified} **\n", false );
 312                                         # start with a shorter timeout for initial testing
 313                                         # header( 'Surrogate-Control: max-age=2678400+2678400, content="ESI/1.0"');
 314                                         header( 'Surrogate-Control: max-age='.$wgSquidMaxage.'+'.$this->mSquidMaxage.', content="ESI/1.0"');
 315                                         header( 'Cache-Control: s-maxage=0, must-revalidate, max-age=0' );
 316                                 } else {
 317                                         # We'll purge the proxy cache for anons explicitly, but require end user agents
 318                                         # to revalidate against the proxy on each visit.
 319                                         # IMPORTANT! The Squid needs to replace the Cache-Control header with
 320                                         # Cache-Control: s-maxage=0, must-revalidate, max-age=0
 321                                         wfDebug( "** local proxy caching; {$this->mLastModified} **\n", false );
 322                                         # start with a shorter timeout for initial testing
 323                                         # header( "Cache-Control: s-maxage=2678400, must-revalidate, max-age=0" );
 324                                         header( 'Cache-Control: s-maxage='.$this->mSquidMaxage.', must-revalidate, max-age=0' );
 325                                 }
 326                         } else {
 327                                 # We do want clients to cache if they can, but they *must* check for updates
 328                                 # on revisiting the page.
 329                                 wfDebug( "** private caching; {$this->mLastModified} **\n", false );
 330                                 header( "Expires: -1" );
 331                                 header( "Cache-Control: private, must-revalidate, max-age=0" );
 332                         }
 333                         if($this->mLastModified) header( "Last-modified: {$this->mLastModified}" );
 334                 } else {
 335                         wfDebug( "** no caching **\n", false );
 336
 337                         # In general, the absence of a last modified header should be enough to prevent
 338                         # the client from using its cache. We send a few other things just to make sure.
 339                         header( 'Expires: -1' );
 340                         header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
 341                         header( 'Pragma: no-cache' );
 342                 }
 343         }
 344
 345         /**
 346          * Finally, all the text has been munged and accumulated into
 347          * the object, let's actually output it:
 348          */
 349         function output() {
 350                 global $wgUser, $wgLang, $wgDebugComments, $wgCookieExpiration;
 351                 global $wgInputEncoding, $wgOutputEncoding, $wgContLanguageCode;
 352                 global $wgDebugRedirects, $wgMimeType, $wgProfiler;
 353                 if( $this->mDoNothing ){
 354                         return;
 355                 }
 356                 $fname = 'OutputPage::output';
 357                 wfProfileIn( $fname );
 358
 359                 $sk = $wgUser->getSkin();
 360
 361                 if ( '' != $this->mRedirect ) {
 362                         if( substr( $this->mRedirect, 0, 4 ) != 'http' ) {
 363                                 # Standards require redirect URLs to be absolute
 364                                 global $wgServer;
 365                                 $this->mRedirect = $wgServer . $this->mRedirect;
 366                         }
 367                         if( $this->mRedirectCode == '301') {
 368                                 if( !$wgDebugRedirects ) {
 369                                         header("HTTP/1.1 {$this->mRedirectCode} Moved Permanently");
 370                                 }
 371                                 $this->mLastModified = gmdate( 'D, j M Y H:i:s' ) . ' GMT';
 372                         }
 373
 374                         $this->sendCacheControl();
 375
 376                         if( $wgDebugRedirects ) {
 377                                 $url = htmlspecialchars( $this->mRedirect );
 378                                 print "<html>\n<head>\n<title>Redirect</title>\n</head>\n<body>\n";
 379                                 print "<p>Location: <a href=\"$url\">$url</a></p>\n";
 380                                 print "</body>\n</html>\n";
 381                         } else {
 382                                 header( 'Location: '.$this->mRedirect );
 383                         }
 384                         if ( isset( $wgProfiler ) ) { wfDebug( $wgProfiler->getOutput() ); }
 385                         return;
 386                 }
 387
 388
 389                 $this->sendCacheControl();
 390                 # Perform link colouring
 391                 $this->transformBuffer();
 392                 $this->replaceLinkHolders( $this->mSubtitle );
 393
 394                 # Disable temporary placeholders, so that the skin produces HTML
 395                 $sk->postParseLinkColour( false );
 396
 397                 header( "Content-type: $wgMimeType; charset={$wgOutputEncoding}" );
 398                 header( 'Content-language: '.$wgContLanguageCode );
 399
 400                 $exp = time() + $wgCookieExpiration;
 401                 foreach( $this->mCookies as $name => $val ) {
 402                         setcookie( $name, $val, $exp, '/' );
 403                 }
 404
 405                 $sk->outputPage( $this );
 406                 # flush();
 407         }
 408
 409         function out( $ins ) {
 410                 global $wgInputEncoding, $wgOutputEncoding, $wgLang;
 411                 if ( 0 == strcmp( $wgInputEncoding, $wgOutputEncoding ) ) {
 412                         $outs = $ins;
 413                 } else {
 414                         $outs = $wgLang->iconv( $wgInputEncoding, $wgOutputEncoding, $ins );
 415                         if ( false === $outs ) { $outs = $ins; }
 416                 }
 417                 print $outs;
 418         }
 419
 420         function setEncodings() {
 421                 global $wgInputEncoding, $wgOutputEncoding;
 422                 global $wgUser, $wgLang;
 423
 424                 $wgInputEncoding = strtolower( $wgInputEncoding );
 425
 426                 if( $wgUser->getOption( 'altencoding' ) ) {
 427                         $wgLang->setAltEncoding();
 428                         return;
 429                 }
 430
 431                 if ( empty( $_SERVER['HTTP_ACCEPT_CHARSET'] ) ) {
 432                         $wgOutputEncoding = strtolower( $wgOutputEncoding );
 433                         return;
 434                 }
 435
 436                 /*
 437                 # This code is unused anyway!
 438                 # Commenting out. --bv 2003-11-15
 439
 440                 $a = explode( ",", $_SERVER['HTTP_ACCEPT_CHARSET'] );
 441                 $best = 0.0;
 442                 $bestset = "*";
 443
 444                 foreach ( $a as $s ) {
 445                         if ( preg_match( "/(.*);q=(.*)/", $s, $m ) ) {
 446                                 $set = $m[1];
 447                                 $q = (float)($m[2]);
 448                         } else {
 449                                 $set = $s;
 450                                 $q = 1.0;
 451                         }
 452                         if ( $q > $best ) {
 453                                 $bestset = $set;
 454                                 $best = $q;
 455                         }
 456                 }
 457                 #if ( "*" == $bestset ) { $bestset = "iso-8859-1"; }
 458                 if ( "*" == $bestset ) { $bestset = $wgOutputEncoding; }
 459                 $wgOutputEncoding = strtolower( $bestset );
 460
 461 # Disable for now
 462 #
 463                 */
 464                 $wgOutputEncoding = $wgInputEncoding;
 465         }
 466
 467         /**
 468          * Returns a HTML comment with the elapsed time since request.
 469          * This method has no side effects.
 470          */
 471         function reportTime() {
 472                 global $wgRequestTime;
 473
 474                 $now = wfTime();
 475                 list( $usec, $sec ) = explode( ' ', $wgRequestTime );
 476                 $start = (float)$sec + (float)$usec;
 477                 $elapsed = $now - $start;
 478
 479                 # Use real server name if available, so we know which machine
 480                 # in a server farm generated the current page.
 481                 if ( function_exists( 'posix_uname' ) ) {
 482                         $uname = @posix_uname();
 483                 } else {
 484                         $uname = false;
 485                 }
 486                 if( is_array( $uname ) && isset( $uname['nodename'] ) ) {
 487                         $hostname = $uname['nodename'];
 488                 } else {
 489                         # This may be a virtual server.
 490                         $hostname = $_SERVER['SERVER_NAME'];
 491                 }
 492                 $com = sprintf( "<!-- Served by %s in %01.2f secs. -->",
 493                   $hostname, $elapsed );
 494                 return $com;
 495         }
 496
 497         /**
 498          * Note: these arguments are keys into wfMsg(), not text!
 499          */
 500         function errorpage( $title, $msg ) {
 501                 global $wgTitle;
 502
 503                 $this->mDebugtext .= 'Original title: ' .
 504                   $wgTitle->getPrefixedText() . "\n";
 505                 $this->setPageTitle( wfMsg( $title ) );
 506                 $this->setHTMLTitle( wfMsg( 'errorpagetitle' ) );
 507                 $this->setRobotpolicy( 'noindex,nofollow' );
 508                 $this->setArticleRelated( false );
 509                 $this->suppressQuickbar();
 510
 511                 $this->enableClientCache( false );
 512                 $this->mRedirect = '';
 513
 514                 $this->mBodytext = '';
 515                 $this->addHTML( '<p>' . wfMsg( $msg ) . "</p>\n" );
 516                 $this->returnToMain( false );
 517
 518                 $this->output();
 519                 wfErrorExit();
 520         }
 521
 522         function sysopRequired() {
 523                 global $wgUser;
 524
 525                 $this->setPageTitle( wfMsg( 'sysoptitle' ) );
 526                 $this->setHTMLTitle( wfMsg( 'errorpagetitle' ) );
 527                 $this->setRobotpolicy( 'noindex,nofollow' );
 528                 $this->setArticleRelated( false );
 529                 $this->mBodytext = '';
 530
 531                 $sk = $wgUser->getSkin();
 532                 $ap = $sk->makeKnownLink( wfMsg( 'administrators' ), '' );
 533                 $this->addHTML( wfMsg( 'sysoptext', $ap ) );
 534                 $this->returnToMain();
 535         }
 536
 537         function developerRequired() {
 538                 global $wgUser;
 539
 540                 $this->setPageTitle( wfMsg( 'developertitle' ) );
 541                 $this->setHTMLTitle( wfMsg( 'errorpagetitle' ) );
 542                 $this->setRobotpolicy( 'noindex,nofollow' );
 543                 $this->setArticleRelated( false );
 544                 $this->mBodytext = '';
 545
 546                 $sk = $wgUser->getSkin();
 547                 $ap = $sk->makeKnownLink( wfMsg( 'administrators' ), '' );
 548                 $this->addHTML( wfMsg( 'developertext', $ap ) );
 549                 $this->returnToMain();
 550         }
 551
 552         function loginToUse() {
 553                 global $wgUser, $wgTitle, $wgLang;
 554
 555                 $this->setPageTitle( wfMsg( 'loginreqtitle' ) );
 556                 $this->setHTMLTitle( wfMsg( 'errorpagetitle' ) );
 557                 $this->setRobotpolicy( 'noindex,nofollow' );
 558                 $this->setArticleFlag( false );
 559                 $this->mBodytext = '';
 560                 $this->addWikiText( wfMsg( 'loginreqtext' ) );
 561
 562                 # We put a comment in the .html file so a Sysop can diagnose the page the
 563                 # user can't see.
 564                 $this->addHTML( "\n<!--" .
 565                                                 $wgLang->getNsText( $wgTitle->getNamespace() ) .
 566                                                 ':' .
 567                                                 $wgTitle->getDBkey() . '-->' );
 568                 $this->returnToMain();          # Flip back to the main page after 10 seconds.
 569         }
 570
 571         function databaseError( $fname, $sql, $error, $errno ) {
 572                 global $wgUser, $wgCommandLineMode;
 573
 574                 $this->setPageTitle( wfMsgNoDB( 'databaseerror' ) );
 575                 $this->setRobotpolicy( 'noindex,nofollow' );
 576                 $this->setArticleRelated( false );
 577                 $this->enableClientCache( false );
 578                 $this->mRedirect = '';
 579
 580                 if ( $wgCommandLineMode ) {
 581                         $msg = wfMsgNoDB( 'dberrortextcl', htmlspecialchars( $sql ),
 582                                                 htmlspecialchars( $fname ), $errno, htmlspecialchars( $error ) );
 583                 } else {
 584                         $msg = wfMsgNoDB( 'dberrortext', htmlspecialchars( $sql ),
 585                                                 htmlspecialchars( $fname ), $errno, htmlspecialchars( $error ) );
 586                 }
 587
 588                 if ( $wgCommandLineMode || !is_object( $wgUser )) {
 589                         print $msg."\n";
 590                         wfErrorExit();
 591                 }
 592                 $this->mBodytext = $msg;
 593                 $this->output();
 594                 wfErrorExit();
 595         }
 596
 597         function readOnlyPage( $source = null, $protected = false ) {
 598                 global $wgUser, $wgReadOnlyFile;
 599
 600                 $this->setRobotpolicy( 'noindex,nofollow' );
 601                 $this->setArticleRelated( false );
 602
 603                 if( $protected ) {
 604                         $this->setPageTitle( wfMsg( 'viewsource' ) );
 605                         $this->addWikiText( wfMsg( 'protectedtext' ) );
 606                 } else {
 607                         $this->setPageTitle( wfMsg( 'readonly' ) );
 608                         $reason = file_get_contents( $wgReadOnlyFile );
 609                         $this->addWikiText( wfMsg( 'readonlytext', $reason ) );
 610                 }
 611
 612                 if( is_string( $source ) ) {
 613                         if( strcmp( $source, '' ) == 0 ) {
 614                                 $source = wfMsg( 'noarticletext' );
 615                         }
 616                         $rows = $wgUser->getOption( 'rows' );
 617                         $cols = $wgUser->getOption( 'cols' );
 618                         $text = "\n<textarea cols='$cols' rows='$rows' readonly='readonly'>" .
 619                                 htmlspecialchars( $source ) . "\n</textarea>";
 620                         $this->addHTML( $text );
 621                 }
 622
 623                 $this->returnToMain( false );
 624         }
 625
 626         function fatalError( $message ) {
 627                 $this->setPageTitle( wfMsg( "internalerror" ) );
 628                 $this->setRobotpolicy( "noindex,nofollow" );
 629                 $this->setArticleRelated( false );
 630                 $this->enableClientCache( false );
 631                 $this->mRedirect = '';
 632
 633                 $this->mBodytext = $message;
 634                 $this->output();
 635                 wfErrorExit();
 636         }
 637
 638         function unexpectedValueError( $name, $val ) {
 639                 $this->fatalError( wfMsg( 'unexpected', $name, $val ) );
 640         }
 641
 642         function fileCopyError( $old, $new ) {
 643                 $this->fatalError( wfMsg( 'filecopyerror', $old, $new ) );
 644         }
 645
 646         function fileRenameError( $old, $new ) {
 647                 $this->fatalError( wfMsg( 'filerenameerror', $old, $new ) );
 648         }
 649
 650         function fileDeleteError( $name ) {
 651                 $this->fatalError( wfMsg( 'filedeleteerror', $name ) );
 652         }
 653
 654         function fileNotFoundError( $name ) {
 655                 $this->fatalError( wfMsg( 'filenotfound', $name ) );
 656         }
 657
 658         /**
 659          * return from error messages or notes
 660          * @param $auto automatically redirect the user after 10 seconds
 661          * @param $returnto page title to return to. Default is Main Page.
 662          */
 663         function returnToMain( $auto = true, $returnto = NULL ) {
 664                 global $wgUser, $wgOut, $wgRequest;
 665
 666                 if ( $returnto == NULL ) {
 667                         $returnto = $wgRequest->getText( 'returnto' );
 668                 }
 669
 670                 $sk = $wgUser->getSkin();
 671                 if ( '' == $returnto ) {
 672                         $returnto = wfMsg( 'mainpage' );
 673                 }
 674                 $link = $sk->makeKnownLink( $returnto, '' );
 675
 676                 $r = wfMsg( 'returnto', $link );
 677                 if ( $auto ) {
 678                         $titleObj = Title::newFromText( $returnto );
 679                         $wgOut->addMeta( 'http:Refresh', '10;url=' . $titleObj->escapeFullURL() );
 680                 }
 681                 $wgOut->addHTML( "\n<p>$r</p>\n" );
 682         }
 683
 684         /**
 685          * This function takes the existing and broken links for the page
 686          * and uses the first 10 of them for META keywords
 687          */
 688         function addMetaTags () {
 689                 global $wgLinkCache , $wgOut ;
 690                 $good = array_keys ( $wgLinkCache->mGoodLinks ) ;
 691                 $bad = array_keys ( $wgLinkCache->mBadLinks ) ;
 692                 $a = array_merge ( $good , $bad ) ;
 693                 $a = array_slice ( $a , 0 , 10 ) ; # 10 keywords max
 694                 $a = implode ( ',' , $a ) ;
 695                 $strip = array(
 696                         "/<.*?" . ">/" => '',
 697                         "/[_]/" => ' '
 698                 );
 699                 $a = htmlspecialchars(preg_replace(array_keys($strip), array_values($strip),$a ));
 700
 701                 $wgOut->addMeta ( 'KEYWORDS' , $a ) ;
 702         }
 703
 704         /**
 705          * @private
 706          */
 707         function headElement() {
 708                 global $wgDocType, $wgDTD, $wgLanguageCode, $wgOutputEncoding, $wgMimeType;
 709                 global $wgUser, $wgLang, $wgRequest;
 710
 711                 $xml = ($wgMimeType == 'text/xml');
 712                 if( $xml ) {
 713                         $ret = "<" . "?xml version=\"1.0\" encoding=\"$wgOutputEncoding\" ?" . ">\n";
 714                 } else {
 715                         $ret = '';
 716                 }
 717
 718                 $ret .= "<!DOCTYPE html PUBLIC \"$wgDocType\"\n        \"$wgDTD\">\n";
 719
 720                 if ( "" == $this->mHTMLtitle ) {
 721                         $this->mHTMLtitle = wfMsg( "pagetitle", $this->mPagetitle );
 722                 }
 723                 if( $xml ) {
 724                         $xmlbits = "xmlns=\"http://www.w3.org/1999/xhtml\" xml:lang=\"en\"";
 725                 } else {
 726                         $xmlbits = '';
 727                 }
 728                 $rtl = $wgLang->isRTL() ? " dir='RTL'" : '';
 729                 $ret .= "<html $xmlbits lang=\"$wgLanguageCode\" $rtl>\n";
 730                 $ret .= "<head>\n<title>" . htmlspecialchars( $this->mHTMLtitle ) . "</title>\n";
 731                 array_push( $this->mMetatags, array( "http:Content-type", "$wgMimeType; charset={$wgOutputEncoding}" ) );
 732
 733                 $ret .= $this->getHeadLinks();
 734                 global $wgStylePath;
 735                 if( $this->isPrintable() ) {
 736                         $media = '';
 737                 } else {
 738                         $media = "media='print'";
 739                 }
 740                 $printsheet = htmlspecialchars( "$wgStylePath/common/wikiprintable.css" );
 741                 $ret .= "<link rel='stylesheet' type='text/css' $media href='$printsheet' />\n";
 742
 743                 $sk = $wgUser->getSkin();
 744                 $ret .= $sk->getHeadScripts();
 745                 $ret .= $this->mScripts;
 746                 $ret .= $sk->getUserStyles();
 747
 748                 $ret .= "</head>\n";
 749                 return $ret;
 750         }
 751
 752         function getHeadLinks() {
 753                 global $wgRequest, $wgStylePath;
 754                 $ret = '';
 755                 foreach ( $this->mMetatags as $tag ) {
 756                         if ( 0 == strcasecmp( 'http:', substr( $tag[0], 0, 5 ) ) ) {
 757                                 $a = 'http-equiv';
 758                                 $tag[0] = substr( $tag[0], 5 );
 759                         } else {
 760                                 $a = 'name';
 761                         }
 762                         $ret .= "<meta $a=\"{$tag[0]}\" content=\"{$tag[1]}\" />\n";
 763                 }
 764                 $p = $this->mRobotpolicy;
 765                 if ( '' == $p ) { $p = 'index,follow'; }
 766                 $ret .= "<meta name=\"robots\" content=\"$p\" />\n";
 767
 768                 if ( count( $this->mKeywords ) > 0 ) {
 769                         $strip = array(
 770                                 "/<.*?" . ">/" => '',
 771                                 "/[_]/" => ' '
 772                         );
 773                         $ret .= "<meta name=\"keywords\" content=\"" .
 774                           htmlspecialchars(preg_replace(array_keys($strip), array_values($strip),implode( ",", $this->mKeywords ))) . "\" />\n";
 775                 }
 776                 foreach ( $this->mLinktags as $tag ) {
 777                         $ret .= '<link';
 778                         foreach( $tag as $attr => $val ) {
 779                                 $ret .= " $attr=\"" . htmlspecialchars( $val ) . "\"";
 780                         }
 781                         $ret .= " />\n";
 782                 }
 783                 if( $this->isSyndicated() ) {
 784                         # FIXME: centralize the mime-type and name information in Feed.php
 785                         $link = $wgRequest->escapeAppendQuery( 'feed=rss' );
 786                         $ret .= "<link rel='alternate' type='application/rss+xml' title='RSS 2.0' href='$link' />\n";
 787                         $link = $wgRequest->escapeAppendQuery( 'feed=atom' );
 788                         $ret .= "<link rel='alternate' type='application/rss+atom' title='Atom 0.3' href='$link' />\n";
 789                 }
 790                 # FIXME: get these working
 791                 # $fix = htmlspecialchars( $wgStylePath . "/ie-png-fix.js" );
 792                 # $ret .= "<!--[if gte IE 5.5000]><script type='text/javascript' src='$fix'>< /script><![endif]-->";
 793                 return $ret;
 794         }
 795
 796         /**
 797          * Run any necessary pre-output transformations on the buffer text
 798          */
 799         function transformBuffer( $options = 0 ) {
 800                 $this->replaceLinkHolders( $this->mBodytext, $options );
 801         }
 802
 803         /**
 804          * Replace <!--LINK--> link placeholders with actual links, in the buffer
 805          * Placeholders created in Skin::makeLinkObj()
 806          * Returns an array of links found, indexed by PDBK:
 807          *  0 - broken
 808          *  1 - normal link
 809          *  2 - stub
 810          * $options is a bit field, RLH_FOR_UPDATE to select for update
 811          */
 812         function replaceLinkHolders( &$text, $options = 0 ) {
 813                 global $wgUser, $wgLinkCache, $wgUseOldExistenceCheck, $wgLinkHolders;
 814
 815                 if ( $wgUseOldExistenceCheck ) {
 816                         return array();
 817                 }
 818
 819                 $fname = 'OutputPage::replaceLinkHolders';
 820                 wfProfileIn( $fname );
 821
 822                 $pdbks = array();
 823                 $colours = array();
 824
 825                 #if ( !empty( $tmpLinks[0] ) ) { #TODO
 826                 if ( !empty( $wgLinkHolders['namespaces'] ) ) {
 827                         wfProfileIn( $fname.'-check' );
 828                         $dbr =& wfGetDB( DB_SLAVE );
 829                         $cur = $dbr->tableName( 'cur' );
 830                         $sk = $wgUser->getSkin();
 831                         $threshold = $wgUser->getOption('stubthreshold');
 832
 833                         # Sort by namespace
 834                         asort( $wgLinkHolders['namespaces'] );
 835
 836                         # Generate query
 837                         $query = false;
 838                         foreach ( $wgLinkHolders['namespaces'] as $key => $val ) {
 839                                 # Make title object
 840                                 $title = $wgLinkHolders['titles'][$key];
 841
 842                                 # Skip invalid entries.
 843                                 # Result will be ugly, but prevents crash.
 844                                 if ( is_null( $title ) ) {
 845                                         continue;
 846                                 }
 847                                 $pdbk = $pdbks[$key] = $title->getPrefixedDBkey();
 848
 849                                 # Check if it's in the link cache already
 850                                 if ( $wgLinkCache->getGoodLinkID( $pdbk ) ) {
 851                                         $colours[$pdbk] = 1;
 852                                 } elseif ( $wgLinkCache->isBadLink( $pdbk ) ) {
 853                                         $colours[$pdbk] = 0;
 854                                 } else {
 855                                         # Not in the link cache, add it to the query
 856                                         if ( !isset( $current ) ) {
 857                                                 $current = $val;
 858                                                 $query =  "SELECT cur_id, cur_namespace, cur_title";
 859                                                 if ( $threshold > 0 ) {
 860                                                         $query .= ", LENGTH(cur_text) AS cur_len, cur_is_redirect";
 861                                                 }
 862                                                 $query .= " FROM $cur WHERE (cur_namespace=$val AND cur_title IN(";
 863                                         } elseif ( $current != $val ) {
 864                                                 $current = $val;
 865                                                 $query .= ")) OR (cur_namespace=$val AND cur_title IN(";
 866                                         } else {
 867                                                 $query .= ', ';
 868                                         }
 869
 870                                         $query .= $dbr->addQuotes( $wgLinkHolders['dbkeys'][$key] );
 871                                 }
 872                         }
 873                         if ( $query ) {
 874                                 $query .= '))';
 875                                 if ( $options & RLH_FOR_UPDATE ) {
 876                                         $query .= ' FOR UPDATE';
 877                                 }
 878
 879                                 $res = $dbr->query( $query, $fname );
 880
 881                                 # Fetch data and form into an associative array
 882                                 # non-existent = broken
 883                                 # 1 = known
 884                                 # 2 = stub
 885                                 while ( $s = $dbr->fetchObject($res) ) {
 886                                         $title = Title::makeTitle( $s->cur_namespace, $s->cur_title );
 887                                         $pdbk = $title->getPrefixedDBkey();
 888                                         $wgLinkCache->addGoodLink( $s->cur_id, $pdbk );
 889
 890                                         if ( $threshold >  0 ) {
 891                                                 $size = $s->cur_len;
 892                                                 if ( $s->cur_is_redirect || $s->cur_namespace != 0 || $length < $threshold ) {
 893                                                         $colours[$pdbk] = 1;
 894                                                 } else {
 895                                                         $colours[$pdbk] = 2;
 896                                                 }
 897                                         } else {
 898                                                 $colours[$pdbk] = 1;
 899                                         }
 900                                 }
 901                         }
 902                         wfProfileOut( $fname.'-check' );
 903
 904                         # Construct search and replace arrays
 905                         wfProfileIn( $fname.'-construct' );
 906                         global $outputReplace;
 907                         $outputReplace = array();
 908                         foreach ( $wgLinkHolders['namespaces'] as $key => $ns ) {
 909                                 $pdbk = $pdbks[$key];
 910                                 $searchkey = '<!--LINK '.$key.'-->';
 911                                 $title = $wgLinkHolders['titles'][$key];
 912                                 if ( empty( $colours[$pdbk] ) ) {
 913                                         $wgLinkCache->addBadLink( $pdbk );
 914                                         $colours[$pdbk] = 0;
 915                                         $outputReplace[$searchkey] = $sk->makeBrokenLinkObj( $title,
 916                                                                         $wgLinkHolders['texts'][$key],
 917                                                                         $wgLinkHolders['queries'][$key] );
 918                                 } elseif ( $colours[$pdbk] == 1 ) {
 919                                         $outputReplace[$searchkey] = $sk->makeKnownLinkObj( $title,
 920                                                                         $wgLinkHolders['texts'][$key],
 921                                                                         $wgLinkHolders['queries'][$key] );
 922                                 } elseif ( $colours[$pdbk] == 2 ) {
 923                                         $outputReplace[$searchkey] = $sk->makeStubLinkObj( $title,
 924                                                                         $wgLinkHolders['texts'][$key],
 925                                                                         $wgLinkHolders['queries'][$key] );
 926                                 }
 927                         }
 928                         wfProfileOut( $fname.'-construct' );
 929
 930                         # Do the thing
 931                         wfProfileIn( $fname.'-replace' );
 932
 933                         $text = preg_replace_callback(
 934                                 '/(<!--LINK .*?-->)/',
 935                                 "outputReplaceMatches",
 936                                 $text);
 937                         wfProfileOut( $fname.'-replace' );
 938                 }
 939                 wfProfileOut( $fname );
 940                 return $colours;
 941         }
 942 }
 943
 944 function &outputReplaceMatches($matches) {
 945         global $outputReplace;
 946         return $outputReplace[$matches[1]];
 947 }
 948
 949 }
 950 ?>