includes/OutputPage.php

   1 <?php
   2 if ( ! defined( 'MEDIAWIKI' ) )
   3         die( 1 );
   4
   5 /**
   6  * @todo document
   7  */
   8 class OutputPage {
   9         var $mMetatags = array(), $mKeywords = array(), $mLinktags = array();
  10         var $mExtStyles = array();
  11         var $mPagetitle = '', $mBodytext = '', $mDebugtext = '';
  12         var $mHTMLtitle = '', $mIsarticle = true, $mPrintable = false;
  13         var $mSubtitle = '', $mRedirect = '', $mStatusCode;
  14         var $mLastModified = '', $mETag = false;
  15         var $mCategoryLinks = array(), $mLanguageLinks = array();
  16         var $mScripts = '', $mLinkColours, $mPageLinkTitle = '', $mHeadItems = array();
  17         var $mTemplateIds = array();
  18
  19         var $mAllowUserJs;
  20         var $mSuppressQuickbar = false;
  21         var $mOnloadHandler = '';
  22         var $mDoNothing = false;
  23         var $mContainsOldMagic = 0, $mContainsNewMagic = 0;
  24         var $mIsArticleRelated = true;
  25         protected $mParserOptions = null; // lazy initialised, use parserOptions()
  26         var $mShowFeedLinks = false;
  27         var $mFeedLinksAppendQuery = false;
  28         var $mEnableClientCache = true;
  29         var $mArticleBodyOnly = false;
  30
  31         var $mNewSectionLink = false;
  32         var $mHideNewSectionLink = false;
  33         var $mNoGallery = false;
  34         var $mPageTitleActionText = '';
  35         var $mParseWarnings = array();
  36         var $mSquidMaxage = 0;
  37         var $mRevisionId = null;
  38         protected $mTitle = null;
  39
  40         /**
  41          * An array of stylesheet filenames (relative from skins path), with options
  42          * for CSS media, IE conditions, and RTL/LTR direction.
  43          * For internal use; add settings in the skin via $this->addStyle()
  44          */
  45         var $styles = array();
  46
  47         private $mIndexPolicy = 'index';
  48         private $mFollowPolicy = 'follow';
  49
  50         /**
  51          * Constructor
  52          * Initialise private variables
  53          */
  54         function __construct() {
  55                 global $wgAllowUserJs;
  56                 $this->mAllowUserJs = $wgAllowUserJs;
  57         }
  58
  59         public function redirect( $url, $responsecode = '302' ) {
  60                 # Strip newlines as a paranoia check for header injection in PHP<5.1.2
  61                 $this->mRedirect = str_replace( "\n", '', $url );
  62                 $this->mRedirectCode = $responsecode;
  63         }
  64
  65         public function getRedirect() {
  66                 return $this->mRedirect;
  67         }
  68
  69         /**
  70          * Set the HTTP status code to send with the output.
  71          *
  72          * @param int $statusCode
  73          * @return nothing
  74          */
  75         function setStatusCode( $statusCode ) { $this->mStatusCode = $statusCode; }
  76
  77         /**
  78          * Add a new <meta> tag
  79          * To add an http-equiv meta tag, precede the name with "http:"
  80          *
  81          * @param $name tag name
  82          * @param $val tag value
  83          */
  84         function addMeta( $name, $val ) {
  85                 array_push( $this->mMetatags, array( $name, $val ) );
  86         }
  87
  88         function addKeyword( $text ) { array_push( $this->mKeywords, $text ); }
  89         function addScript( $script ) { $this->mScripts .= "\t\t".$script; }
  90
  91         function addExtensionStyle( $url ) {
  92                 $linkarr = array( 'rel' => 'stylesheet', 'href' => $url, 'type' => 'text/css' );
  93                 array_push( $this->mExtStyles, $linkarr );
  94         }
  95
  96         /**
  97          * Add a JavaScript file out of skins/common, or a given relative path.
  98          * @param string $file filename in skins/common or complete on-server path (/foo/bar.js)
  99          */
 100         function addScriptFile( $file ) {
 101                 global $wgStylePath, $wgStyleVersion, $wgJsMimeType;
 102                 if( substr( $file, 0, 1 ) == '/' ) {
 103                         $path = $file;
 104                 } else {
 105                         $path =  "{$wgStylePath}/common/{$file}";
 106                 }
 107                 $this->addScript(
 108                         Xml::element( 'script',
 109                                 array(
 110                                         'type' => $wgJsMimeType,
 111                                         'src' => "$path?$wgStyleVersion",
 112                                 ),
 113                                 '', false
 114                         )
 115                 );
 116         }
 117
 118         /**
 119          * Add a self-contained script tag with the given contents
 120          * @param string $script JavaScript text, no <script> tags
 121          */
 122         function addInlineScript( $script ) {
 123                 global $wgJsMimeType;
 124                 $this->mScripts .= "<script type=\"$wgJsMimeType\">/*<![CDATA[*/\n$script\n/*]]>*/</script>";
 125         }
 126
 127         function getScript() {
 128                 return $this->mScripts . $this->getHeadItems();
 129         }
 130
 131         function getHeadItems() {
 132                 $s = '';
 133                 foreach ( $this->mHeadItems as $item ) {
 134                         $s .= $item;
 135                 }
 136                 return $s;
 137         }
 138
 139         function addHeadItem( $name, $value ) {
 140                 $this->mHeadItems[$name] = $value;
 141         }
 142
 143         function hasHeadItem( $name ) {
 144                 return isset( $this->mHeadItems[$name] );
 145         }
 146
 147         function setETag($tag) { $this->mETag = $tag; }
 148         function setArticleBodyOnly($only) { $this->mArticleBodyOnly = $only; }
 149         function getArticleBodyOnly($only) { return $this->mArticleBodyOnly; }
 150
 151         function addLink( $linkarr ) {
 152                 # $linkarr should be an associative array of attributes. We'll escape on output.
 153                 array_push( $this->mLinktags, $linkarr );
 154         }
 155
 156         # Get all links added by extensions
 157         function getExtStyle() {
 158                 return $this->mExtStyles;
 159         }
 160
 161         function addMetadataLink( $linkarr ) {
 162                 # note: buggy CC software only reads first "meta" link
 163                 static $haveMeta = false;
 164                 $linkarr['rel'] = ($haveMeta) ? 'alternate meta' : 'meta';
 165                 $this->addLink( $linkarr );
 166                 $haveMeta = true;
 167         }
 168
 169         /**
 170          * checkLastModified tells the client to use the client-cached page if
 171          * possible. If sucessful, the OutputPage is disabled so that
 172          * any future call to OutputPage->output() have no effect.
 173          *
 174          * Side effect: sets mLastModified for Last-Modified header
 175          *
 176          * @return bool True iff cache-ok headers was sent.
 177          */
 178         function checkLastModified( $timestamp ) {
 179                 global $wgCachePages, $wgCacheEpoch, $wgUser, $wgRequest;
 180
 181                 if ( !$timestamp || $timestamp == '19700101000000' ) {
 182                         wfDebug( __METHOD__ . ": CACHE DISABLED, NO TIMESTAMP\n" );
 183                         return false;
 184                 }
 185                 if( !$wgCachePages ) {
 186                         wfDebug( __METHOD__ . ": CACHE DISABLED\n", false );
 187                         return false;
 188                 }
 189                 if( $wgUser->getOption( 'nocache' ) ) {
 190                         wfDebug( __METHOD__ . ": USER DISABLED CACHE\n", false );
 191                         return false;
 192                 }
 193
 194                 $timestamp = wfTimestamp( TS_MW, $timestamp );
 195                 $modifiedTimes = array(
 196                         'page' => $timestamp,
 197                         'user' => $wgUser->getTouched(),
 198                         'epoch' => $wgCacheEpoch
 199                 );
 200                 wfRunHooks( 'OutputPageCheckLastModified', array( &$modifiedTimes ) );
 201
 202                 $maxModified = max( $modifiedTimes );
 203                 $this->mLastModified = wfTimestamp( TS_RFC2822, $maxModified );
 204
 205                 if( empty( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) ) {
 206                         wfDebug( __METHOD__ . ": client did not send If-Modified-Since header\n", false );
 207                         return false;
 208                 }
 209
 210                 # Make debug info
 211                 $info = '';
 212                 foreach ( $modifiedTimes as $name => $value ) {
 213                         if ( $info !== '' ) {
 214                                 $info .= ', ';
 215                         }
 216                         $info .= "$name=" . wfTimestamp( TS_ISO_8601, $value );
 217                 }
 218
 219                 # IE sends sizes after the date like this:
 220                 # Wed, 20 Aug 2003 06:51:19 GMT; length=5202
 221                 # this breaks strtotime().
 222                 $clientHeader = preg_replace( '/;.*$/', '', $_SERVER["HTTP_IF_MODIFIED_SINCE"] );
 223
 224                 wfSuppressWarnings(); // E_STRICT system time bitching
 225                 $clientHeaderTime = strtotime( $clientHeader );
 226                 wfRestoreWarnings();
 227                 if ( !$clientHeaderTime ) {
 228                         wfDebug( __METHOD__ . ": unable to parse the client's If-Modified-Since header: $clientHeader\n" );
 229                         return false;
 230                 }
 231                 $clientHeaderTime = wfTimestamp( TS_MW, $clientHeaderTime );
 232
 233                 wfDebug( __METHOD__ . ": client sent If-Modified-Since: " .
 234                         wfTimestamp( TS_ISO_8601, $clientHeaderTime ) . "\n", false );
 235                 wfDebug( __METHOD__ . ": effective Last-Modified: " .
 236                         wfTimestamp( TS_ISO_8601, $maxModified ) . "\n", false );
 237                 if( $clientHeaderTime < $maxModified ) {
 238                         wfDebug( __METHOD__ . ": STALE, $info\n", false );
 239                         return false;
 240                 }
 241
 242                 # Not modified
 243                 # Give a 304 response code and disable body output
 244                 wfDebug( __METHOD__ . ": NOT MODIFIED, $info\n", false );
 245                 ini_set('zlib.output_compression', 0);
 246                 $wgRequest->response()->header( "HTTP/1.1 304 Not Modified" );
 247                 $this->sendCacheControl();
 248                 $this->disable();
 249
 250                 // Don't output a compressed blob when using ob_gzhandler;
 251                 // it's technically against HTTP spec and seems to confuse
 252                 // Firefox when the response gets split over two packets.
 253                 wfClearOutputBuffers();
 254
 255                 return true;
 256         }
 257
 258         function setPageTitleActionText( $text ) {
 259                 $this->mPageTitleActionText = $text;
 260         }
 261
 262         function getPageTitleActionText () {
 263                 if ( isset( $this->mPageTitleActionText ) ) {
 264                         return $this->mPageTitleActionText;
 265                 }
 266         }
 267
 268         /**
 269          * Set the robot policy for the page: <http://www.robotstxt.org/meta.html>
 270          *
 271          * @param $policy string The literal string to output as the contents of
 272          *   the meta tag.  Will be parsed according to the spec and output in
 273          *   standardized form.
 274          * @return null
 275          */
 276         public function setRobotPolicy( $policy ) {
 277                 $policy = explode( ',', $policy );
 278                 $policy = array_map( 'trim', $policy );
 279
 280                 # The default policy is follow, so if nothing is said explicitly, we
 281                 # do that.
 282                 if( in_array( 'nofollow', $policy ) ) {
 283                         $this->mFollowPolicy = 'nofollow';
 284                 } else {
 285                         $this->mFollowPolicy = 'follow';
 286                 }
 287
 288                 if( in_array( 'noindex', $policy ) ) {
 289                         $this->mIndexPolicy = 'noindex';
 290                 } else {
 291                         $this->mIndexPolicy = 'index';
 292                 }
 293         }
 294
 295         /**
 296          * Set the index policy for the page, but leave the follow policy un-
 297          * touched.
 298          *
 299          * @param $policy string Either 'index' or 'noindex'.
 300          * @return null
 301          */
 302         public function setIndexPolicy( $policy ) {
 303                 $policy = trim( $policy );
 304                 if( in_array( $policy, array( 'index', 'noindex' ) ) ) {
 305                         $this->mIndexPolicy = $policy;
 306                 }
 307         }
 308
 309         /**
 310          * Set the follow policy for the page, but leave the index policy un-
 311          * touched.
 312          *
 313          * @param $policy string Either 'follow' or 'nofollow'.
 314          * @return null
 315          */
 316         public function setFollowPolicy( $policy ) {
 317                 $policy = trim( $policy );
 318                 if( in_array( $policy, array( 'follow', 'nofollow' ) ) ) {
 319                         $this->mFollowPolicy = $policy;
 320                 }
 321         }
 322
 323         public function setHTMLTitle( $name ) { $this->mHTMLtitle = $name; }
 324         public function setPageTitle( $name ) {
 325                 global $wgContLang;
 326                 $name = $wgContLang->convert( $name, true );
 327                 $this->mPagetitle = $name;
 328
 329                 $taction =  $this->getPageTitleActionText();
 330                 if( !empty( $taction ) ) {
 331                         $name .= ' - '.$taction;
 332                 }
 333
 334                 $this->setHTMLTitle( wfMsg( 'pagetitle', $name ) );
 335         }
 336
 337         public function setTitle( $t ) {
 338                 $this->mTitle = $t;
 339         }
 340
 341         public function getTitle() {
 342                 if ( $this->mTitle instanceof Title ) {
 343                         return $this->mTitle;
 344                 }
 345                 else {
 346                         wfDebug( __METHOD__ . ' called and $mTitle is null. Return $wgTitle for sanity' );
 347                         global $wgTitle;
 348                         return $wgTitle;
 349                 }
 350         }
 351
 352         public function getHTMLTitle() { return $this->mHTMLtitle; }
 353         public function getPageTitle() { return $this->mPagetitle; }
 354         public function setSubtitle( $str ) { $this->mSubtitle = /*$this->parse(*/$str/*)*/; } // @bug 2514
 355         public function appendSubtitle( $str ) { $this->mSubtitle .= /*$this->parse(*/$str/*)*/; } // @bug 2514
 356         public function getSubtitle() { return $this->mSubtitle; }
 357         public function isArticle() { return $this->mIsarticle; }
 358         public function setPrintable() { $this->mPrintable = true; }
 359         public function isPrintable() { return $this->mPrintable; }
 360         public function setSyndicated( $show = true ) { $this->mShowFeedLinks = $show; }
 361         public function isSyndicated() { return $this->mShowFeedLinks; }
 362         public function setFeedAppendQuery( $val ) { $this->mFeedLinksAppendQuery = $val; }
 363         public function getFeedAppendQuery() { return $this->mFeedLinksAppendQuery; }
 364         public function setOnloadHandler( $js ) { $this->mOnloadHandler = $js; }
 365         public function getOnloadHandler() { return $this->mOnloadHandler; }
 366         public function disable() { $this->mDoNothing = true; }
 367         public function isDisabled() { return $this->mDoNothing; }
 368
 369         public function setArticleRelated( $v ) {
 370                 $this->mIsArticleRelated = $v;
 371                 if ( !$v ) {
 372                         $this->mIsarticle = false;
 373                 }
 374         }
 375         public function setArticleFlag( $v ) {
 376                 $this->mIsarticle = $v;
 377                 if ( $v ) {
 378                         $this->mIsArticleRelated = $v;
 379                 }
 380         }
 381
 382         public function isArticleRelated() { return $this->mIsArticleRelated; }
 383
 384         public function getLanguageLinks() { return $this->mLanguageLinks; }
 385         public function addLanguageLinks($newLinkArray) {
 386                 $this->mLanguageLinks += $newLinkArray;
 387         }
 388         public function setLanguageLinks($newLinkArray) {
 389                 $this->mLanguageLinks = $newLinkArray;
 390         }
 391
 392         public function getCategoryLinks() {
 393                 return $this->mCategoryLinks;
 394         }
 395
 396         /**
 397          * Add an array of categories, with names in the keys
 398          */
 399         public function addCategoryLinks( $categories ) {
 400                 global $wgUser, $wgContLang;
 401
 402                 if ( !is_array( $categories ) || count( $categories ) == 0 ) {
 403                         return;
 404                 }
 405
 406                 # Add the links to a LinkBatch
 407                 $arr = array( NS_CATEGORY => $categories );
 408                 $lb = new LinkBatch;
 409                 $lb->setArray( $arr );
 410
 411                 # Fetch existence plus the hiddencat property
 412                 $dbr = wfGetDB( DB_SLAVE );
 413                 $pageTable = $dbr->tableName( 'page' );
 414                 $where = $lb->constructSet( 'page', $dbr );
 415                 $propsTable = $dbr->tableName( 'page_props' );
 416                 $sql = "SELECT page_id, page_namespace, page_title, page_len, page_is_redirect, pp_value
 417                         FROM $pageTable LEFT JOIN $propsTable ON pp_propname='hiddencat' AND pp_page=page_id WHERE $where";
 418                 $res = $dbr->query( $sql, __METHOD__ );
 419
 420                 # Add the results to the link cache
 421                 $lb->addResultToCache( LinkCache::singleton(), $res );
 422
 423                 # Set all the values to 'normal'. This can be done with array_fill_keys in PHP 5.2.0+
 424                 $categories = array_combine( array_keys( $categories ),
 425                         array_fill( 0, count( $categories ), 'normal' ) );
 426
 427                 # Mark hidden categories
 428                 foreach ( $res as $row ) {
 429                         if ( isset( $row->pp_value ) ) {
 430                                 $categories[$row->page_title] = 'hidden';
 431                         }
 432                 }
 433
 434                 # Add the remaining categories to the skin
 435                 if ( wfRunHooks( 'OutputPageMakeCategoryLinks', array( &$this, $categories, &$this->mCategoryLinks ) ) ) {
 436                         $sk = $wgUser->getSkin();
 437                         foreach ( $categories as $category => $type ) {
 438                                 $origcategory = $category;
 439                                 $title = Title::makeTitleSafe( NS_CATEGORY, $category );
 440                                 $wgContLang->findVariantLink( $category, $title, true );
 441                                 if ( $category != $origcategory )
 442                                         if ( array_key_exists( $category, $categories ) )
 443                                                 continue;
 444                                 $text = $wgContLang->convertHtml( $title->getText() );
 445                                 $this->mCategoryLinks[$type][] = $sk->makeLinkObj( $title, $text );
 446                         }
 447                 }
 448         }
 449
 450         public function setCategoryLinks($categories) {
 451                 $this->mCategoryLinks = array();
 452                 $this->addCategoryLinks($categories);
 453         }
 454
 455         public function suppressQuickbar() { $this->mSuppressQuickbar = true; }
 456         public function isQuickbarSuppressed() { return $this->mSuppressQuickbar; }
 457
 458         public function disallowUserJs() { $this->mAllowUserJs = false; }
 459         public function isUserJsAllowed() { return $this->mAllowUserJs; }
 460
 461         public function prependHTML( $text ) { $this->mBodytext = $text . $this->mBodytext; }
 462         public function addHTML( $text ) { $this->mBodytext .= $text; }
 463         public function clearHTML() { $this->mBodytext = ''; }
 464         public function getHTML() { return $this->mBodytext; }
 465         public function debug( $text ) { $this->mDebugtext .= $text; }
 466
 467         /* @deprecated */
 468         public function setParserOptions( $options ) {
 469                 wfDeprecated( __METHOD__ );
 470                 return $this->parserOptions( $options );
 471         }
 472
 473         public function parserOptions( $options = null ) {
 474                 if ( !$this->mParserOptions ) {
 475                         $this->mParserOptions = new ParserOptions;
 476                 }
 477                 return wfSetVar( $this->mParserOptions, $options );
 478         }
 479
 480         /**
 481          * Set the revision ID which will be seen by the wiki text parser
 482          * for things such as embedded {{REVISIONID}} variable use.
 483          * @param mixed $revid an integer, or NULL
 484          * @return mixed previous value
 485          */
 486         public function setRevisionId( $revid ) {
 487                 $val = is_null( $revid ) ? null : intval( $revid );
 488                 return wfSetVar( $this->mRevisionId, $val );
 489         }
 490
 491         public function getRevisionId() {
 492                 return $this->mRevisionId;
 493         }
 494
 495         /**
 496          * Convert wikitext to HTML and add it to the buffer
 497          * Default assumes that the current page title will
 498          * be used.
 499          *
 500          * @param string $text
 501          * @param bool   $linestart
 502          */
 503         public function addWikiText( $text, $linestart = true ) {
 504                 $this->addWikiTextTitle( $text, $this->getTitle(), $linestart );
 505         }
 506
 507         public function addWikiTextWithTitle($text, &$title, $linestart = true) {
 508                 $this->addWikiTextTitle($text, $title, $linestart);
 509         }
 510
 511         function addWikiTextTitleTidy($text, &$title, $linestart = true) {
 512                 $this->addWikiTextTitle( $text, $title, $linestart, true );
 513         }
 514
 515         public function addWikiTextTitle($text, &$title, $linestart, $tidy = false) {
 516                 global $wgParser;
 517
 518                 wfProfileIn( __METHOD__ );
 519
 520                 wfIncrStats( 'pcache_not_possible' );
 521
 522                 $popts = $this->parserOptions();
 523                 $oldTidy = $popts->setTidy( $tidy );
 524
 525                 $parserOutput = $wgParser->parse( $text, $title, $popts,
 526                         $linestart, true, $this->mRevisionId );
 527
 528                 $popts->setTidy( $oldTidy );
 529
 530                 $this->addParserOutput( $parserOutput );
 531
 532                 wfProfileOut( __METHOD__ );
 533         }
 534
 535         /**
 536          * @todo document
 537          * @param ParserOutput object &$parserOutput
 538          */
 539         public function addParserOutputNoText( &$parserOutput ) {
 540                 global $wgExemptFromUserRobotsControl, $wgContentNamespaces;
 541
 542                 $this->mLanguageLinks += $parserOutput->getLanguageLinks();
 543                 $this->addCategoryLinks( $parserOutput->getCategories() );
 544                 $this->mNewSectionLink = $parserOutput->getNewSection();
 545                 $this->mHideNewSectionLink = $parserOutput->getHideNewSection();
 546
 547                 if( is_null( $wgExemptFromUserRobotsControl ) ) {
 548                         $bannedNamespaces = $wgContentNamespaces;
 549                 } else {
 550                         $bannedNamespaces = $wgExemptFromUserRobotsControl;
 551                 }
 552                 if( !in_array( $this->getTitle()->getNamespace(), $bannedNamespaces ) ) {
 553                         # FIXME (bug 14900): This overrides $wgArticleRobotPolicies, and it
 554                         # shouldn't
 555                         $this->setIndexPolicy( $parserOutput->getIndexPolicy() );
 556                 }
 557
 558                 $this->addKeywords( $parserOutput );
 559                 $this->mParseWarnings = $parserOutput->getWarnings();
 560                 if ( $parserOutput->getCacheTime() == -1 ) {
 561                         $this->enableClientCache( false );
 562                 }
 563                 $this->mNoGallery = $parserOutput->getNoGallery();
 564                 $this->mHeadItems = array_merge( $this->mHeadItems, (array)$parserOutput->mHeadItems );
 565                 // Versioning...
 566                 foreach ( (array)$parserOutput->mTemplateIds as $ns => $dbks ) {
 567                         if ( isset( $this->mTemplateIds[$ns] ) ) {
 568                                 $this->mTemplateIds[$ns] = $dbks + $this->mTemplateIds[$ns];
 569                         } else {
 570                                 $this->mTemplateIds[$ns] = $dbks;
 571                         }
 572                 }
 573                 // Page title
 574                 if( ( $dt = $parserOutput->getDisplayTitle() ) !== false )
 575                         $this->setPageTitle( $dt );
 576                 else if ( ( $title = $parserOutput->getTitleText() ) != '' )
 577                         $this->setPageTitle( $title );
 578
 579                 // Hooks registered in the object
 580                 global $wgParserOutputHooks;
 581                 foreach ( $parserOutput->getOutputHooks() as $hookInfo ) {
 582                         list( $hookName, $data ) = $hookInfo;
 583                         if ( isset( $wgParserOutputHooks[$hookName] ) ) {
 584                                 call_user_func( $wgParserOutputHooks[$hookName], $this, $parserOutput, $data );
 585                         }
 586                 }
 587
 588                 wfRunHooks( 'OutputPageParserOutput', array( &$this, $parserOutput ) );
 589         }
 590
 591         /**
 592          * @todo document
 593          * @param ParserOutput &$parserOutput
 594          */
 595         function addParserOutput( &$parserOutput ) {
 596                 $this->addParserOutputNoText( $parserOutput );
 597                 $text = $parserOutput->getText();
 598                 wfRunHooks( 'OutputPageBeforeHTML',array( &$this, &$text ) );
 599                 $this->addHTML( $text );
 600         }
 601
 602         /**
 603          * Add wikitext to the buffer, assuming that this is the primary text for a page view
 604          * Saves the text into the parser cache if possible.
 605          *
 606          * @param string  $text
 607          * @param Article $article
 608          * @param bool    $cache
 609          * @deprecated Use Article::outputWikitext
 610          */
 611         public function addPrimaryWikiText( $text, $article, $cache = true ) {
 612                 global $wgParser, $wgUser;
 613
 614                 wfDeprecated( __METHOD__ );
 615
 616                 $popts = $this->parserOptions();
 617                 $popts->setTidy(true);
 618                 $parserOutput = $wgParser->parse( $text, $article->mTitle,
 619                         $popts, true, true, $this->mRevisionId );
 620                 $popts->setTidy(false);
 621                 if ( $cache && $article && $parserOutput->getCacheTime() != -1 ) {
 622                         $parserCache = ParserCache::singleton();
 623                         $parserCache->save( $parserOutput, $article, $popts);
 624                 }
 625
 626                 $this->addParserOutput( $parserOutput );
 627         }
 628
 629         /**
 630          * @deprecated use addWikiTextTidy()
 631          */
 632         public function addSecondaryWikiText( $text, $linestart = true ) {
 633                 wfDeprecated( __METHOD__ );
 634                 $this->addWikiTextTitleTidy($text, $this->getTitle(), $linestart);
 635         }
 636
 637         /**
 638          * Add wikitext with tidy enabled
 639          */
 640         public function addWikiTextTidy(  $text, $linestart = true ) {
 641                 $this->addWikiTextTitleTidy($text, $this->getTitle(), $linestart);
 642         }
 643
 644
 645         /**
 646          * Add the output of a QuickTemplate to the output buffer
 647          *
 648          * @param QuickTemplate $template
 649          */
 650         public function addTemplate( &$template ) {
 651                 ob_start();
 652                 $template->execute();
 653                 $this->addHTML( ob_get_contents() );
 654                 ob_end_clean();
 655         }
 656
 657         /**
 658          * Parse wikitext and return the HTML.
 659          *
 660          * @param string $text
 661          * @param bool   $linestart Is this the start of a line?
 662          * @param bool   $interface ??
 663          */
 664         public function parse( $text, $linestart = true, $interface = false ) {
 665                 global $wgParser;
 666                 if( is_null( $this->getTitle() ) ) {
 667                         throw new MWException( 'Empty $mTitle in ' . __METHOD__ );
 668                 }
 669                 $popts = $this->parserOptions();
 670                 if ( $interface) { $popts->setInterfaceMessage(true); }
 671                 $parserOutput = $wgParser->parse( $text, $this->getTitle(), $popts,
 672                         $linestart, true, $this->mRevisionId );
 673                 if ( $interface) { $popts->setInterfaceMessage(false); }
 674                 return $parserOutput->getText();
 675         }
 676
 677         /** Parse wikitext, strip paragraphs, and return the HTML. */
 678         public function parseInline( $text, $linestart = true, $interface = false ) {
 679                 $parsed = $this->parse( $text, $linestart, $interface );
 680
 681                 $m = array();
 682                 if ( preg_match( '/^<p>(.*)\n?<\/p>\n?/sU', $parsed, $m ) ) {
 683                         $parsed = $m[1];
 684                 }
 685
 686                 return $parsed;
 687         }
 688
 689         /**
 690          * @param Article $article
 691          * @param User    $user
 692          *
 693          * @return bool True if successful, else false.
 694          */
 695         public function tryParserCache( &$article ) {
 696                 $parserCache = ParserCache::singleton();
 697                 $parserOutput = $parserCache->get( $article, $this->parserOptions() );
 698                 if ( $parserOutput !== false ) {
 699                         $this->addParserOutput( $parserOutput );
 700                         return true;
 701                 } else {
 702                         return false;
 703                 }
 704         }
 705
 706         /**
 707          * @param int $maxage Maximum cache time on the Squid, in seconds.
 708          */
 709         public function setSquidMaxage( $maxage ) {
 710                 $this->mSquidMaxage = $maxage;
 711         }
 712
 713         /**
 714          * Use enableClientCache(false) to force it to send nocache headers
 715          * @param $state ??
 716          */
 717         public function enableClientCache( $state ) {
 718                 return wfSetVar( $this->mEnableClientCache, $state );
 719         }
 720
 721         function getCacheVaryCookies() {
 722                 global $wgCookiePrefix, $wgCacheVaryCookies;
 723                 static $cookies;
 724                 if ( $cookies === null ) {
 725                         $cookies = array_merge(
 726                                 array(
 727                                         "{$wgCookiePrefix}Token",
 728                                         "{$wgCookiePrefix}LoggedOut",
 729                                         session_name()
 730                                 ),
 731                                 $wgCacheVaryCookies
 732                         );
 733                         wfRunHooks('GetCacheVaryCookies', array( $this, &$cookies ) );
 734                 }
 735                 return $cookies;
 736         }
 737
 738         function uncacheableBecauseRequestVars() {
 739                 global $wgRequest;
 740                 return  $wgRequest->getText('useskin', false) === false
 741                         && $wgRequest->getText('uselang', false) === false;
 742         }
 743
 744         /**
 745          * Check if the request has a cache-varying cookie header
 746          * If it does, it's very important that we don't allow public caching
 747          */
 748         function haveCacheVaryCookies() {
 749                 global $wgRequest;
 750                 $cookieHeader = $wgRequest->getHeader( 'cookie' );
 751                 if ( $cookieHeader === false ) {
 752                         return false;
 753                 }
 754                 $cvCookies = $this->getCacheVaryCookies();
 755                 foreach ( $cvCookies as $cookieName ) {
 756                         # Check for a simple string match, like the way squid does it
 757                         if ( strpos( $cookieHeader, $cookieName ) ) {
 758                                 wfDebug( __METHOD__.": found $cookieName\n" );
 759                                 return true;
 760                         }
 761                 }
 762                 wfDebug( __METHOD__.": no cache-varying cookies found\n" );
 763                 return false;
 764         }
 765
 766         /** Get a complete X-Vary-Options header */
 767         public function getXVO() {
 768                 $cvCookies = $this->getCacheVaryCookies();
 769                 $xvo = 'X-Vary-Options: Accept-Encoding;list-contains=gzip,Cookie;';
 770                 $first = true;
 771                 foreach ( $cvCookies as $cookieName ) {
 772                         if ( $first ) {
 773                                 $first = false;
 774                         } else {
 775                                 $xvo .= ';';
 776                         }
 777                         $xvo .= 'string-contains=' . $cookieName;
 778                 }
 779                 return $xvo;
 780         }
 781
 782         public function sendCacheControl() {
 783                 global $wgUseSquid, $wgUseESI, $wgUseETag, $wgSquidMaxage, $wgRequest;
 784
 785                 $response = $wgRequest->response();
 786                 if ($wgUseETag && $this->mETag)
 787                         $response->header("ETag: $this->mETag");
 788
 789                 # don't serve compressed data to clients who can't handle it
 790                 # maintain different caches for logged-in users and non-logged in ones
 791                 $response->header( 'Vary: Accept-Encoding, Cookie' );
 792
 793                 # Add an X-Vary-Options header for Squid with Wikimedia patches
 794                 $response->header( $this->getXVO() );
 795
 796                 if( !$this->uncacheableBecauseRequestVars() && $this->mEnableClientCache ) {
 797                         if( $wgUseSquid && session_id() == '' &&
 798                           ! $this->isPrintable() && $this->mSquidMaxage != 0 && !$this->haveCacheVaryCookies() )
 799                         {
 800                                 if ( $wgUseESI ) {
 801                                         # We'll purge the proxy cache explicitly, but require end user agents
 802                                         # to revalidate against the proxy on each visit.
 803                                         # Surrogate-Control controls our Squid, Cache-Control downstream caches
 804                                         wfDebug( __METHOD__ . ": proxy caching with ESI; {$this->mLastModified} **\n", false );
 805                                         # start with a shorter timeout for initial testing
 806                                         # header( 'Surrogate-Control: max-age=2678400+2678400, content="ESI/1.0"');
 807                                         $response->header( 'Surrogate-Control: max-age='.$wgSquidMaxage.'+'.$this->mSquidMaxage.', content="ESI/1.0"');
 808                                         $response->header( 'Cache-Control: s-maxage=0, must-revalidate, max-age=0' );
 809                                 } else {
 810                                         # We'll purge the proxy cache for anons explicitly, but require end user agents
 811                                         # to revalidate against the proxy on each visit.
 812                                         # IMPORTANT! The Squid needs to replace the Cache-Control header with
 813                                         # Cache-Control: s-maxage=0, must-revalidate, max-age=0
 814                                         wfDebug( __METHOD__ . ": local proxy caching; {$this->mLastModified} **\n", false );
 815                                         # start with a shorter timeout for initial testing
 816                                         # header( "Cache-Control: s-maxage=2678400, must-revalidate, max-age=0" );
 817                                         $response->header( 'Cache-Control: s-maxage='.$this->mSquidMaxage.', must-revalidate, max-age=0' );
 818                                 }
 819                         } else {
 820                                 # We do want clients to cache if they can, but they *must* check for updates
 821                                 # on revisiting the page.
 822                                 wfDebug( __METHOD__ . ": private caching; {$this->mLastModified} **\n", false );
 823                                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
 824                                 $response->header( "Cache-Control: private, must-revalidate, max-age=0" );
 825                         }
 826                         if($this->mLastModified) {
 827                                 $response->header( "Last-Modified: {$this->mLastModified}" );
 828                         }
 829                 } else {
 830                         wfDebug( __METHOD__ . ": no caching **\n", false );
 831
 832                         # In general, the absence of a last modified header should be enough to prevent
 833                         # the client from using its cache. We send a few other things just to make sure.
 834                         $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
 835                         $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
 836                         $response->header( 'Pragma: no-cache' );
 837                 }
 838         }
 839
 840         /**
 841          * Finally, all the text has been munged and accumulated into
 842          * the object, let's actually output it:
 843          */
 844         public function output() {
 845                 global $wgUser, $wgOutputEncoding, $wgRequest;
 846                 global $wgContLanguageCode, $wgDebugRedirects, $wgMimeType;
 847                 global $wgJsMimeType, $wgUseAjax, $wgAjaxWatch;
 848                 global $wgEnableMWSuggest, $wgUniversalEditButton;
 849                 global $wgArticle;
 850
 851                 if( $this->mDoNothing ){
 852                         return;
 853                 }
 854
 855                 wfProfileIn( __METHOD__ );
 856
 857                 if ( '' != $this->mRedirect ) {
 858                         # Standards require redirect URLs to be absolute
 859                         $this->mRedirect = wfExpandUrl( $this->mRedirect );
 860                         if( $this->mRedirectCode == '301') {
 861                                 if( !$wgDebugRedirects ) {
 862                                         $wgRequest->response()->header("HTTP/1.1 {$this->mRedirectCode} Moved Permanently");
 863                                 }
 864                                 $this->mLastModified = wfTimestamp( TS_RFC2822 );
 865                         }
 866
 867                         $this->sendCacheControl();
 868
 869                         $wgRequest->response()->header("Content-Type: text/html; charset=utf-8");
 870                         if( $wgDebugRedirects ) {
 871                                 $url = htmlspecialchars( $this->mRedirect );
 872                                 print "<html>\n<head>\n<title>Redirect</title>\n</head>\n<body>\n";
 873                                 print "<p>Location: <a href=\"$url\">$url</a></p>\n";
 874                                 print "</body>\n</html>\n";
 875                         } else {
 876                                 $wgRequest->response()->header( 'Location: '.$this->mRedirect );
 877                         }
 878                         wfProfileOut( __METHOD__ );
 879                         return;
 880                 }
 881                 elseif ( $this->mStatusCode )
 882                 {
 883                         $statusMessage = array(
 884                                 100 => 'Continue',
 885                                 101 => 'Switching Protocols',
 886                                 102 => 'Processing',
 887                                 200 => 'OK',
 888                                 201 => 'Created',
 889                                 202 => 'Accepted',
 890                                 203 => 'Non-Authoritative Information',
 891                                 204 => 'No Content',
 892                                 205 => 'Reset Content',
 893                                 206 => 'Partial Content',
 894                                 207 => 'Multi-Status',
 895                                 300 => 'Multiple Choices',
 896                                 301 => 'Moved Permanently',
 897                                 302 => 'Found',
 898                                 303 => 'See Other',
 899                                 304 => 'Not Modified',
 900                                 305 => 'Use Proxy',
 901                                 307 => 'Temporary Redirect',
 902                                 400 => 'Bad Request',
 903                                 401 => 'Unauthorized',
 904                                 402 => 'Payment Required',
 905                                 403 => 'Forbidden',
 906                                 404 => 'Not Found',
 907                                 405 => 'Method Not Allowed',
 908                                 406 => 'Not Acceptable',
 909                                 407 => 'Proxy Authentication Required',
 910                                 408 => 'Request Timeout',
 911                                 409 => 'Conflict',
 912                                 410 => 'Gone',
 913                                 411 => 'Length Required',
 914                                 412 => 'Precondition Failed',
 915                                 413 => 'Request Entity Too Large',
 916                                 414 => 'Request-URI Too Large',
 917                                 415 => 'Unsupported Media Type',
 918                                 416 => 'Request Range Not Satisfiable',
 919                                 417 => 'Expectation Failed',
 920                                 422 => 'Unprocessable Entity',
 921                                 423 => 'Locked',
 922                                 424 => 'Failed Dependency',
 923                                 500 => 'Internal Server Error',
 924                                 501 => 'Not Implemented',
 925                                 502 => 'Bad Gateway',
 926                                 503 => 'Service Unavailable',
 927                                 504 => 'Gateway Timeout',
 928                                 505 => 'HTTP Version Not Supported',
 929                                 507 => 'Insufficient Storage'
 930                         );
 931
 932                         if ( $statusMessage[$this->mStatusCode] )
 933                                 $wgRequest->response()->header( 'HTTP/1.1 ' . $this->mStatusCode . ' ' . $statusMessage[$this->mStatusCode] );
 934                 }
 935
 936                 $sk = $wgUser->getSkin();
 937
 938                 if ( $wgUseAjax ) {
 939                         $this->addScriptFile( 'ajax.js' );
 940
 941                         wfRunHooks( 'AjaxAddScript', array( &$this ) );
 942
 943                         if( $wgAjaxWatch && $wgUser->isLoggedIn() ) {
 944                                 $this->addScriptFile( 'ajaxwatch.js' );
 945                         }
 946
 947                         if ( $wgEnableMWSuggest && !$wgUser->getOption( 'disablesuggest', false ) ){
 948                                 $this->addScriptFile( 'mwsuggest.js' );
 949                         }
 950                 }
 951
 952                 if( $wgUser->getBoolOption( 'editsectiononrightclick' ) ) {
 953                         $this->addScriptFile( 'rightclickedit.js' );
 954                 }
 955
 956                 if( $wgUniversalEditButton ) {
 957                         if( isset( $wgArticle ) && $this->getTitle() && $this->getTitle()->quickUserCan( 'edit' )
 958                                 && ( $this->getTitle()->exists() || $this->getTitle()->quickUserCan( 'create' ) ) ) {
 959                                 // Original UniversalEditButton
 960                                 $this->addLink( array(
 961                                         'rel' => 'alternate',
 962                                         'type' => 'application/x-wiki',
 963                                         'title' => wfMsg( 'edit' ),
 964                                         'href' => $this->getTitle()->getLocalURL( 'action=edit' )
 965                                 ) );
 966                                 // Alternate edit link
 967                                 $this->addLink( array(
 968                                         'rel' => 'edit',
 969                                         'title' => wfMsg( 'edit' ),
 970                                         'href' => $this->getTitle()->getLocalURL( 'action=edit' )
 971                                 ) );
 972                         }
 973                 }
 974
 975                 # Buffer output; final headers may depend on later processing
 976                 ob_start();
 977
 978                 $wgRequest->response()->header( "Content-type: $wgMimeType; charset={$wgOutputEncoding}" );
 979                 $wgRequest->response()->header( 'Content-language: '.$wgContLanguageCode );
 980
 981                 if ($this->mArticleBodyOnly) {
 982                         $this->out($this->mBodytext);
 983                 } else {
 984                         // Hook that allows last minute changes to the output page, e.g.
 985                         // adding of CSS or Javascript by extensions.
 986                         wfRunHooks( 'BeforePageDisplay', array( &$this, &$sk ) );
 987
 988                         wfProfileIn( 'Output-skin' );
 989                         $sk->outputPage( $this );
 990                         wfProfileOut( 'Output-skin' );
 991                 }
 992
 993                 $this->sendCacheControl();
 994                 ob_end_flush();
 995                 wfProfileOut( __METHOD__ );
 996         }
 997
 998         /**
 999          * Actually output something with print(). Performs an iconv to the
1000          * output encoding, if needed.
1001          * @param string $ins The string to output
1002          */
1003         public function out( $ins ) {
1004                 global $wgInputEncoding, $wgOutputEncoding, $wgContLang;
1005                 if ( 0 == strcmp( $wgInputEncoding, $wgOutputEncoding ) ) {
1006                         $outs = $ins;
1007                 } else {
1008                         $outs = $wgContLang->iconv( $wgInputEncoding, $wgOutputEncoding, $ins );
1009                         if ( false === $outs ) { $outs = $ins; }
1010                 }
1011                 print $outs;
1012         }
1013
1014         /**
1015          * @todo document
1016          */
1017         public static function setEncodings() {
1018                 global $wgInputEncoding, $wgOutputEncoding;
1019                 global $wgUser, $wgContLang;
1020
1021                 $wgInputEncoding = strtolower( $wgInputEncoding );
1022
1023                 if ( empty( $_SERVER['HTTP_ACCEPT_CHARSET'] ) ) {
1024                         $wgOutputEncoding = strtolower( $wgOutputEncoding );
1025                         return;
1026                 }
1027                 $wgOutputEncoding = $wgInputEncoding;
1028         }
1029
1030         /**
1031          * Deprecated, use wfReportTime() instead.
1032          * @return string
1033          * @deprecated
1034          */
1035         public function reportTime() {
1036                 wfDeprecated( __METHOD__ );
1037                 $time = wfReportTime();
1038                 return $time;
1039         }
1040
1041         /**
1042          * Produce a "user is blocked" page.
1043          *
1044          * @param bool $return Whether to have a "return to $wgTitle" message or not.
1045          * @return nothing
1046          */
1047         function blockedPage( $return = true ) {
1048                 global $wgUser, $wgContLang, $wgLang;
1049
1050                 $this->setPageTitle( wfMsg( 'blockedtitle' ) );
1051                 $this->setRobotPolicy( 'noindex,nofollow' );
1052                 $this->setArticleRelated( false );
1053
1054                 $name = User::whoIs( $wgUser->blockedBy() );
1055                 $reason = $wgUser->blockedFor();
1056                 if( $reason == '' ) {
1057                         $reason = wfMsg( 'blockednoreason' );
1058                 }
1059                 $blockTimestamp = $wgLang->timeanddate( wfTimestamp( TS_MW, $wgUser->mBlock->mTimestamp ), true );
1060                 $ip = wfGetIP();
1061
1062                 $link = '[[' . $wgContLang->getNsText( NS_USER ) . ":{$name}|{$name}]]";
1063
1064                 $blockid = $wgUser->mBlock->mId;
1065
1066                 $blockExpiry = $wgUser->mBlock->mExpiry;
1067                 if ( $blockExpiry == 'infinity' ) {
1068                         // Entry in database (table ipblocks) is 'infinity' but 'ipboptions' uses 'infinite' or 'indefinite'
1069                         // Search for localization in 'ipboptions'
1070                         $scBlockExpiryOptions = wfMsg( 'ipboptions' );
1071                         foreach ( explode( ',', $scBlockExpiryOptions ) as $option ) {
1072                                 if ( strpos( $option, ":" ) === false )
1073                                         continue;
1074                                 list( $show, $value ) = explode( ":", $option );
1075                                 if ( $value == 'infinite' || $value == 'indefinite' ) {
1076                                         $blockExpiry = $show;
1077                                         break;
1078                                 }
1079                         }
1080                 } else {
1081                         $blockExpiry = $wgLang->timeanddate( wfTimestamp( TS_MW, $blockExpiry ), true );
1082                 }
1083
1084                 if ( $wgUser->mBlock->mAuto ) {
1085                         $msg = 'autoblockedtext';
1086                 } else {
1087                         $msg = 'blockedtext';
1088                 }
1089
1090                 /* $ip returns who *is* being blocked, $intended contains who was meant to be blocked.
1091                  * This could be a username, an ip range, or a single ip. */
1092                 $intended = $wgUser->mBlock->mAddress;
1093
1094                 $this->addWikiMsg( $msg, $link, $reason, $ip, $name, $blockid, $blockExpiry, $intended, $blockTimestamp );
1095
1096                 # Don't auto-return to special pages
1097                 if( $return ) {
1098                         $return = $this->getTitle()->getNamespace() > -1 ? $this->getTitle() : null;
1099                         $this->returnToMain( null, $return );
1100                 }
1101         }
1102
1103         /**
1104          * Output a standard error page
1105          *
1106          * @param string $title Message key for page title
1107          * @param string $msg Message key for page text
1108          * @param array $params Message parameters
1109          */
1110         public function showErrorPage( $title, $msg, $params = array() ) {
1111                 if ( $this->getTitle() ) {
1112                         $this->mDebugtext .= 'Original title: ' . $this->getTitle()->getPrefixedText() . "\n";
1113                 }
1114                 $this->setPageTitle( wfMsg( $title ) );
1115                 $this->setHTMLTitle( wfMsg( 'errorpagetitle' ) );
1116                 $this->setRobotPolicy( 'noindex,nofollow' );
1117                 $this->setArticleRelated( false );
1118                 $this->enableClientCache( false );
1119                 $this->mRedirect = '';
1120                 $this->mBodytext = '';
1121
1122                 array_unshift( $params, 'parse' );
1123                 array_unshift( $params, $msg );
1124                 $this->addHTML( call_user_func_array( 'wfMsgExt', $params ) );
1125
1126                 $this->returnToMain();
1127         }
1128
1129         /**
1130          * Output a standard permission error page
1131          *
1132          * @param array $errors Error message keys
1133          */
1134         public function showPermissionsErrorPage( $errors, $action = null )
1135         {
1136                 $this->mDebugtext .= 'Original title: ' .
1137                 $this->getTitle()->getPrefixedText() . "\n";
1138                 $this->setPageTitle( wfMsg( 'permissionserrors' ) );
1139                 $this->setHTMLTitle( wfMsg( 'permissionserrors' ) );
1140                 $this->setRobotPolicy( 'noindex,nofollow' );
1141                 $this->setArticleRelated( false );
1142                 $this->enableClientCache( false );
1143                 $this->mRedirect = '';
1144                 $this->mBodytext = '';
1145                 $this->addWikiText( $this->formatPermissionsErrorMessage( $errors, $action ) );
1146         }
1147
1148         /** @deprecated */
1149         public function errorpage( $title, $msg ) {
1150                 wfDeprecated( __METHOD__ );
1151                 throw new ErrorPageError( $title, $msg );
1152         }
1153
1154         /**
1155          * Display an error page indicating that a given version of MediaWiki is
1156          * required to use it
1157          *
1158          * @param mixed $version The version of MediaWiki needed to use the page
1159          */
1160         public function versionRequired( $version ) {
1161                 $this->setPageTitle( wfMsg( 'versionrequired', $version ) );
1162                 $this->setHTMLTitle( wfMsg( 'versionrequired', $version ) );
1163                 $this->setRobotPolicy( 'noindex,nofollow' );
1164                 $this->setArticleRelated( false );
1165                 $this->mBodytext = '';
1166
1167                 $this->addWikiMsg( 'versionrequiredtext', $version );
1168                 $this->returnToMain();
1169         }
1170
1171         /**
1172          * Display an error page noting that a given permission bit is required.
1173          *
1174          * @param string $permission key required
1175          */
1176         public function permissionRequired( $permission ) {
1177                 global $wgUser, $wgLang;
1178
1179                 $this->setPageTitle( wfMsg( 'badaccess' ) );
1180                 $this->setHTMLTitle( wfMsg( 'errorpagetitle' ) );
1181                 $this->setRobotPolicy( 'noindex,nofollow' );
1182                 $this->setArticleRelated( false );
1183                 $this->mBodytext = '';
1184
1185                 $groups = array_map( array( 'User', 'makeGroupLinkWiki' ),
1186                         User::getGroupsWithPermission( $permission ) );
1187                 if( $groups ) {
1188                         $this->addWikiMsg( 'badaccess-groups',
1189                                 $wgLang->commaList( $groups ),
1190                                 count( $groups) );
1191                 } else {
1192                         $this->addWikiMsg( 'badaccess-group0' );
1193                 }
1194                 $this->returnToMain();
1195         }
1196
1197         /**
1198          * Use permissionRequired.
1199          * @deprecated
1200          */
1201         public function sysopRequired() {
1202                 throw new MWException( "Call to deprecated OutputPage::sysopRequired() method\n" );
1203         }
1204
1205         /**
1206          * Use permissionRequired.
1207          * @deprecated
1208          */
1209         public function developerRequired() {
1210                 throw new MWException( "Call to deprecated OutputPage::developerRequired() method\n" );
1211         }
1212
1213         /**
1214          * Produce the stock "please login to use the wiki" page
1215          */
1216         public function loginToUse() {
1217                 global $wgUser, $wgContLang;
1218
1219                 if( $wgUser->isLoggedIn() ) {
1220                         $this->permissionRequired( 'read' );
1221                         return;
1222                 }
1223
1224                 $skin = $wgUser->getSkin();
1225
1226                 $this->setPageTitle( wfMsg( 'loginreqtitle' ) );
1227                 $this->setHtmlTitle( wfMsg( 'errorpagetitle' ) );
1228                 $this->setRobotPolicy( 'noindex,nofollow' );
1229                 $this->setArticleFlag( false );
1230
1231                 $loginTitle = SpecialPage::getTitleFor( 'Userlogin' );
1232                 $loginLink = $skin->makeKnownLinkObj( $loginTitle, wfMsgHtml( 'loginreqlink' ), 'returnto=' . $this->getTitle()->getPrefixedUrl() );
1233                 $this->addHTML( wfMsgWikiHtml( 'loginreqpagetext', $loginLink ) );
1234                 $this->addHTML( "\n<!--" . $this->getTitle()->getPrefixedUrl() . "-->" );
1235
1236                 # Don't return to the main page if the user can't read it
1237                 # otherwise we'll end up in a pointless loop
1238                 $mainPage = Title::newMainPage();
1239                 if( $mainPage->userCanRead() )
1240                         $this->returnToMain( null, $mainPage );
1241         }
1242
1243         /** @deprecated */
1244         public function databaseError( $fname, $sql, $error, $errno ) {
1245                 throw new MWException( "OutputPage::databaseError is obsolete\n" );
1246         }
1247
1248         /**
1249          * @param array $errors An array of arrays returned by Title::getUserPermissionsErrors
1250          * @return string The wikitext error-messages, formatted into a list.
1251          */
1252         public function formatPermissionsErrorMessage( $errors, $action = null ) {
1253                 if ($action == null) {
1254                         $text = wfMsgNoTrans( 'permissionserrorstext', count($errors)). "\n\n";
1255                 } else {
1256                         global $wgLang;
1257                         $action_desc = wfMsg( "action-$action" );
1258                         $text = wfMsgNoTrans( 'permissionserrorstext-withaction', count($errors), $action_desc ) . "\n\n";
1259                 }
1260
1261                 if (count( $errors ) > 1) {
1262                         $text .= '<ul class="permissions-errors">' . "\n";
1263
1264                         foreach( $errors as $error )
1265                         {
1266                                 $text .= '<li>';
1267                                 $text .= call_user_func_array( 'wfMsgNoTrans', $error );
1268                                 $text .= "</li>\n";
1269                         }
1270                         $text .= '</ul>';
1271                 } else {
1272                         $text .= '<div class="permissions-errors">' . call_user_func_array( 'wfMsgNoTrans', reset( $errors ) ) . '</div>';
1273                 }
1274
1275                 return $text;
1276         }
1277
1278         /**
1279          * Display a page stating that the Wiki is in read-only mode,
1280          * and optionally show the source of the page that the user
1281          * was trying to edit.  Should only be called (for this
1282          * purpose) after wfReadOnly() has returned true.
1283          *
1284          * For historical reasons, this function is _also_ used to
1285          * show the error message when a user tries to edit a page
1286          * they are not allowed to edit.  (Unless it's because they're
1287          * blocked, then we show blockedPage() instead.)  In this
1288          * case, the second parameter should be set to true and a list
1289          * of reasons supplied as the third parameter.
1290          *
1291          * @todo Needs to be split into multiple functions.
1292          *
1293          * @param string $source    Source code to show (or null).
1294          * @param bool   $protected Is this a permissions error?
1295          * @param array  $reasons   List of reasons for this error, as returned by Title::getUserPermissionsErrors().
1296          */
1297         public function readOnlyPage( $source = null, $protected = false, $reasons = array(), $action = null ) {
1298                 global $wgUser;
1299                 $skin = $wgUser->getSkin();
1300
1301                 $this->setRobotPolicy( 'noindex,nofollow' );
1302                 $this->setArticleRelated( false );
1303
1304                 // If no reason is given, just supply a default "I can't let you do
1305                 // that, Dave" message.  Should only occur if called by legacy code.
1306                 if ( $protected && empty($reasons) ) {
1307                         $reasons[] = array( 'badaccess-group0' );
1308                 }
1309
1310                 if ( !empty($reasons) ) {
1311                         // Permissions error
1312                         if( $source ) {
1313                                 $this->setPageTitle( wfMsg( 'viewsource' ) );
1314                                 $this->setSubtitle( wfMsg( 'viewsourcefor', $skin->makeKnownLinkObj( $this->getTitle() ) ) );
1315                         } else {
1316                                 $this->setPageTitle( wfMsg( 'badaccess' ) );
1317                         }
1318                         $this->addWikiText( $this->formatPermissionsErrorMessage( $reasons, $action ) );
1319                 } else {
1320                         // Wiki is read only
1321                         $this->setPageTitle( wfMsg( 'readonly' ) );
1322                         $reason = wfReadOnlyReason();
1323                         $this->wrapWikiMsg( '<div class="mw-readonly-error">$1</div>', array( 'readonlytext', $reason ) );
1324                 }
1325
1326                 // Show source, if supplied
1327                 if( is_string( $source ) ) {
1328                         $this->addWikiMsg( 'viewsourcetext' );
1329                         $text = Xml::openElement( 'textarea',
1330                                                 array( 'id'   => 'wpTextbox1',
1331                                                        'name' => 'wpTextbox1',
1332                                                        'cols' => $wgUser->getOption( 'cols' ),
1333                                                        'rows' => $wgUser->getOption( 'rows' ),
1334                                                        'readonly' => 'readonly' ) );
1335                         $text .= htmlspecialchars( $source );
1336                         $text .= Xml::closeElement( 'textarea' );
1337                         $this->addHTML( $text );
1338
1339                         // Show templates used by this article
1340                         $skin = $wgUser->getSkin();
1341                         $article = new Article( $this->getTitle() );
1342                         $this->addHTML( "<div class='templatesUsed'>
1343 {$skin->formatTemplates( $article->getUsedTemplates() )}
1344 </div>
1345 " );
1346                 }
1347
1348                 # If the title doesn't exist, it's fairly pointless to print a return
1349                 # link to it.  After all, you just tried editing it and couldn't, so
1350                 # what's there to do there?
1351                 if( $this->getTitle()->exists() ) {
1352                         $this->returnToMain( null, $this->getTitle() );
1353                 }
1354         }
1355
1356         /** @deprecated */
1357         public function fatalError( $message ) {
1358                 wfDeprecated( __METHOD__ );
1359                 throw new FatalError( $message );
1360         }
1361
1362         /** @deprecated */
1363         public function unexpectedValueError( $name, $val ) {
1364                 wfDeprecated( __METHOD__ );
1365                 throw new FatalError( wfMsg( 'unexpected', $name, $val ) );
1366         }
1367
1368         /** @deprecated */
1369         public function fileCopyError( $old, $new ) {
1370                 wfDeprecated( __METHOD__ );
1371                 throw new FatalError( wfMsg( 'filecopyerror', $old, $new ) );
1372         }
1373
1374         /** @deprecated */
1375         public function fileRenameError( $old, $new ) {
1376                 wfDeprecated( __METHOD__ );
1377                 throw new FatalError( wfMsg( 'filerenameerror', $old, $new ) );
1378         }
1379
1380         /** @deprecated */
1381         public function fileDeleteError( $name ) {
1382                 wfDeprecated( __METHOD__ );
1383                 throw new FatalError( wfMsg( 'filedeleteerror', $name ) );
1384         }
1385
1386         /** @deprecated */
1387         public function fileNotFoundError( $name ) {
1388                 wfDeprecated( __METHOD__ );
1389                 throw new FatalError( wfMsg( 'filenotfound', $name ) );
1390         }
1391
1392         public function showFatalError( $message ) {
1393                 $this->setPageTitle( wfMsg( "internalerror" ) );
1394                 $this->setRobotPolicy( "noindex,nofollow" );
1395                 $this->setArticleRelated( false );
1396                 $this->enableClientCache( false );
1397                 $this->mRedirect = '';
1398                 $this->mBodytext = $message;
1399         }
1400
1401         public function showUnexpectedValueError( $name, $val ) {
1402                 $this->showFatalError( wfMsg( 'unexpected', $name, $val ) );
1403         }
1404
1405         public function showFileCopyError( $old, $new ) {
1406                 $this->showFatalError( wfMsg( 'filecopyerror', $old, $new ) );
1407         }
1408
1409         public function showFileRenameError( $old, $new ) {
1410                 $this->showFatalError( wfMsg( 'filerenameerror', $old, $new ) );
1411         }
1412
1413         public function showFileDeleteError( $name ) {
1414                 $this->showFatalError( wfMsg( 'filedeleteerror', $name ) );
1415         }
1416
1417         public function showFileNotFoundError( $name ) {
1418                 $this->showFatalError( wfMsg( 'filenotfound', $name ) );
1419         }
1420
1421         /**
1422          * Add a "return to" link pointing to a specified title
1423          *
1424          * @param Title $title Title to link
1425          */
1426         public function addReturnTo( $title ) {
1427                 global $wgUser;
1428                 $this->addLink( array( 'rel' => 'next', 'href' => $title->getFullUrl() ) );
1429                 $link = wfMsg( 'returnto', $wgUser->getSkin()->makeLinkObj( $title ) );
1430                 $this->addHTML( "<p>{$link}</p>\n" );
1431         }
1432
1433         /**
1434          * Add a "return to" link pointing to a specified title,
1435          * or the title indicated in the request, or else the main page
1436          *
1437          * @param null $unused No longer used
1438          * @param Title $returnto Title to return to
1439          */
1440         public function returnToMain( $unused = null, $returnto = NULL ) {
1441                 global $wgRequest;
1442
1443                 if ( $returnto == NULL ) {
1444                         $returnto = $wgRequest->getText( 'returnto' );
1445                 }
1446
1447                 if ( '' === $returnto ) {
1448                         $returnto = Title::newMainPage();
1449                 }
1450
1451                 if ( is_object( $returnto ) ) {
1452                         $titleObj = $returnto;
1453                 } else {
1454                         $titleObj = Title::newFromText( $returnto );
1455                 }
1456                 if ( !is_object( $titleObj ) ) {
1457                         $titleObj = Title::newMainPage();
1458                 }
1459
1460                 $this->addReturnTo( $titleObj );
1461         }
1462
1463         /**
1464          * This function takes the title (first item of mGoodLinks), categories, existing and broken links for the page
1465          * and uses the first 10 of them for META keywords
1466          *
1467          * @param ParserOutput &$parserOutput
1468          */
1469         private function addKeywords( &$parserOutput ) {
1470                 $this->addKeyword( $this->getTitle()->getPrefixedText() );
1471                 $count = 1;
1472                 $links2d =& $parserOutput->getLinks();
1473                 if ( !is_array( $links2d ) ) {
1474                         return;
1475                 }
1476                 foreach ( $links2d as $dbkeys ) {
1477                         foreach( $dbkeys as $dbkey => $unused ) {
1478                                 $this->addKeyword( $dbkey );
1479                                 if ( ++$count > 10 ) {
1480                                         break 2;
1481                                 }
1482                         }
1483                 }
1484         }
1485
1486         /**
1487          * @return string The doctype, opening <html>, and head element.
1488          */
1489         public function headElement( Skin $sk ) {
1490                 global $wgDocType, $wgDTD, $wgContLanguageCode, $wgOutputEncoding, $wgMimeType;
1491                 global $wgXhtmlDefaultNamespace, $wgXhtmlNamespaces;
1492                 global $wgUser, $wgContLang, $wgUseTrackbacks, $wgStyleVersion;
1493
1494                 $this->addMeta( "http:Content-type", "$wgMimeType; charset={$wgOutputEncoding}" );
1495                 $this->addStyle( 'common/wikiprintable.css', 'print' );
1496                 $sk->setupUserCss( $this );
1497
1498                 $ret = '';
1499
1500                 if( $wgMimeType == 'text/xml' || $wgMimeType == 'application/xhtml+xml' || $wgMimeType == 'application/xml' ) {
1501                         $ret .= "<?xml version=\"1.0\" encoding=\"$wgOutputEncoding\" ?" . ">\n";
1502                 }
1503
1504                 $ret .= "<!DOCTYPE html PUBLIC \"$wgDocType\"\n        \"$wgDTD\">\n";
1505
1506                 if ( '' == $this->getHTMLTitle() ) {
1507                         $this->setHTMLTitle(  wfMsg( 'pagetitle', $this->getPageTitle() ));
1508                 }
1509
1510                 $rtl = $wgContLang->isRTL() ? " dir='RTL'" : '';
1511                 $ret .= "<html xmlns=\"{$wgXhtmlDefaultNamespace}\" ";
1512                 foreach($wgXhtmlNamespaces as $tag => $ns) {
1513                         $ret .= "xmlns:{$tag}=\"{$ns}\" ";
1514                 }
1515                 $ret .= "xml:lang=\"$wgContLanguageCode\" lang=\"$wgContLanguageCode\" $rtl>\n";
1516                 $ret .= "<head>\n<title>" . htmlspecialchars( $this->getHTMLTitle() ) . "</title>\n\t\t";
1517                 $ret .= implode( "\t\t", array(
1518                         $this->getHeadLinks(),
1519                         $this->buildCssLinks(),
1520                         $sk->getHeadScripts( $this->mAllowUserJs ),
1521                         $this->mScripts,
1522                         $this->getHeadItems(),
1523                 ));
1524                 if( $sk->usercss ){
1525                         $ret .= "<style type='text/css'>{$sk->usercss}</style>";
1526                 }
1527
1528                 if ($wgUseTrackbacks && $this->isArticleRelated())
1529                         $ret .= $this->getTitle()->trackbackRDF();
1530
1531                 $ret .= "</head>\n";
1532                 return $ret;
1533         }
1534
1535         protected function addDefaultMeta() {
1536                 global $wgVersion;
1537                 $this->addMeta( 'http:Content-Style-Type', 'text/css' ); //bug 15835
1538                 $this->addMeta( 'generator', "MediaWiki $wgVersion" );
1539
1540                 $p = "{$this->mIndexPolicy},{$this->mFollowPolicy}";
1541                 if( $p !== 'index,follow' ) {
1542                         // http://www.robotstxt.org/wc/meta-user.html
1543                         // Only show if it's different from the default robots policy
1544                         $this->addMeta( 'robots', $p );
1545                 }
1546
1547                 if ( count( $this->mKeywords ) > 0 ) {
1548                         $strip = array(
1549                                 "/<.*?" . ">/" => '',
1550                                 "/_/" => ' '
1551                         );
1552                         $this->addMeta( 'keywords', preg_replace(array_keys($strip), array_values($strip),implode( ",", $this->mKeywords ) ) );
1553                 }
1554         }
1555
1556         /**
1557          * @return string HTML tag links to be put in the header.
1558          */
1559         public function getHeadLinks() {
1560                 global $wgRequest, $wgFeed;
1561
1562                 // Ideally this should happen earlier, somewhere. :P
1563                 $this->addDefaultMeta();
1564
1565                 $tags = array();
1566
1567                 foreach ( $this->mMetatags as $tag ) {
1568                         if ( 0 == strcasecmp( 'http:', substr( $tag[0], 0, 5 ) ) ) {
1569                                 $a = 'http-equiv';
1570                                 $tag[0] = substr( $tag[0], 5 );
1571                         } else {
1572                                 $a = 'name';
1573                         }
1574                         $tags[] = Xml::element( 'meta',
1575                                 array(
1576                                         $a => $tag[0],
1577                                         'content' => $tag[1] ) );
1578                 }
1579                 foreach ( $this->mLinktags as $tag ) {
1580                         $tags[] = Xml::element( 'link', $tag );
1581                 }
1582
1583                 if( $wgFeed ) {
1584                         foreach( $this->getSyndicationLinks() as $format => $link ) {
1585                                 # Use the page name for the title (accessed through $wgTitle since
1586                                 # there's no other way).  In principle, this could lead to issues
1587                                 # with having the same name for different feeds corresponding to
1588                                 # the same page, but we can't avoid that at this low a level.
1589
1590                                 $tags[] = $this->feedLink(
1591                                         $format,
1592                                         $link,
1593                                         wfMsg( "page-{$format}-feed", $this->getTitle()->getPrefixedText() ) ); # Used messages: 'page-rss-feed' and 'page-atom-feed' (for an easier grep)
1594                         }
1595
1596                         # Recent changes feed should appear on every page (except recentchanges,
1597                         # that would be redundant). Put it after the per-page feed to avoid
1598                         # changing existing behavior. It's still available, probably via a
1599                         # menu in your browser. Some sites might have a different feed they'd
1600                         # like to promote instead of the RC feed (maybe like a "Recent New Articles"
1601                         # or "Breaking news" one). For this, we see if $wgOverrideSiteFeed is defined.
1602                         # If so, use it instead.
1603
1604                         global $wgOverrideSiteFeed, $wgSitename, $wgFeedClasses;
1605                         $rctitle = SpecialPage::getTitleFor( 'Recentchanges' );
1606
1607                         if ( $wgOverrideSiteFeed ) {
1608                                 foreach ( $wgOverrideSiteFeed as $type => $feedUrl ) {
1609                                         $tags[] = $this->feedLink (
1610                                                 $type,
1611                                                 htmlspecialchars( $feedUrl ),
1612                                                 wfMsg( "site-{$type}-feed", $wgSitename ) );
1613                                 }
1614                         }
1615                         else if ( $this->getTitle()->getPrefixedText() != $rctitle->getPrefixedText() ) {
1616                                 foreach( $wgFeedClasses as $format => $class ) {
1617                                         $tags[] = $this->feedLink(
1618                                                 $format,
1619                                                 $rctitle->getLocalURL( "feed={$format}" ),
1620                                                 wfMsg( "site-{$format}-feed", $wgSitename ) ); # For grep: 'site-rss-feed', 'site-atom-feed'.
1621                                 }
1622                         }
1623                 }
1624
1625                 return implode( "\n\t\t", $tags ) . "\n";
1626         }
1627
1628         /**
1629          * Return URLs for each supported syndication format for this page.
1630          * @return array associating format keys with URLs
1631          */
1632         public function getSyndicationLinks() {
1633                 global $wgFeedClasses;
1634                 $links = array();
1635
1636                 if( $this->isSyndicated() ) {
1637                         if( is_string( $this->getFeedAppendQuery() ) ) {
1638                                 $appendQuery = "&" . $this->getFeedAppendQuery();
1639                         } else {
1640                                 $appendQuery = "";
1641                         }
1642
1643                         foreach( $wgFeedClasses as $format => $class ) {
1644                                 $links[$format] = $this->getTitle()->getLocalUrl( "feed=$format{$appendQuery}" );
1645                         }
1646                 }
1647                 return $links;
1648         }
1649
1650         /**
1651          * Generate a <link rel/> for an RSS feed.
1652          */
1653         private function feedLink( $type, $url, $text ) {
1654                 return Xml::element( 'link', array(
1655                         'rel' => 'alternate',
1656                         'type' => "application/$type+xml",
1657                         'title' => $text,
1658                         'href' => $url ) );
1659         }
1660
1661         /**
1662          * Add a local or specified stylesheet, with the given media options.
1663          * Meant primarily for internal use...
1664          *
1665          * @param $media -- to specify a media type, 'screen', 'printable', 'handheld' or any.
1666          * @param $conditional -- for IE conditional comments, specifying an IE version
1667          * @param $dir -- set to 'rtl' or 'ltr' for direction-specific sheets
1668          */
1669         public function addStyle( $style, $media='', $condition='', $dir='' ) {
1670                 $options = array();
1671                 if( $media )
1672                         $options['media'] = $media;
1673                 if( $condition )
1674                         $options['condition'] = $condition;
1675                 if( $dir )
1676                         $options['dir'] = $dir;
1677                 $this->styles[$style] = $options;
1678         }
1679
1680         /**
1681          * Build a set of <link>s for the stylesheets specified in the $this->styles array.
1682          * These will be applied to various media & IE conditionals.
1683          */
1684         public function buildCssLinks() {
1685                 $links = array();
1686                 foreach( $this->styles as $file => $options ) {
1687                         $link = $this->styleLink( $file, $options );
1688                         if( $link )
1689                                 $links[] = $link;
1690                 }
1691
1692                 return implode( "\n\t\t", $links );
1693         }
1694
1695         protected function styleLink( $style, $options ) {
1696                 global $wgRequest;
1697
1698                 if( isset( $options['dir'] ) ) {
1699                         global $wgContLang;
1700                         $siteDir = $wgContLang->isRTL() ? 'rtl' : 'ltr';
1701                         if( $siteDir != $options['dir'] )
1702                                 return '';
1703                 }
1704
1705                 if( isset( $options['media'] ) ) {
1706                         $media = $this->transformCssMedia( $options['media'] );
1707                         if( is_null( $media ) ) {
1708                                 return '';
1709                         }
1710                 } else {
1711                         $media = '';
1712                 }
1713
1714                 if( substr( $style, 0, 1 ) == '/' ||
1715                         substr( $style, 0, 5 ) == 'http:' ||
1716                         substr( $style, 0, 6 ) == 'https:' ) {
1717                         $url = $style;
1718                 } else {
1719                         global $wgStylePath, $wgStyleVersion;
1720                         $url = $wgStylePath . '/' . $style . '?' . $wgStyleVersion;
1721                 }
1722
1723                 $attribs = array(
1724                         'rel' => 'stylesheet',
1725                         'href' => $url,
1726                         'type' => 'text/css' );
1727                 if( $media ) {
1728                         $attribs['media'] = $media;
1729                 }
1730
1731                 $link = Xml::element( 'link', $attribs );
1732
1733                 if( isset( $options['condition'] ) ) {
1734                         $condition = htmlspecialchars( $options['condition'] );
1735                         $link = "<!--[if $condition]>$link<![endif]-->";
1736                 }
1737                 return $link;
1738         }
1739
1740         function transformCssMedia( $media ) {
1741                 global $wgRequest, $wgHandheldForIPhone;
1742
1743                 // Switch in on-screen display for media testing
1744                 $switches = array(
1745                         'printable' => 'print',
1746                         'handheld' => 'handheld',
1747                 );
1748                 foreach( $switches as $switch => $targetMedia ) {
1749                         if( $wgRequest->getBool( $switch ) ) {
1750                                 if( $media == $targetMedia ) {
1751                                         $media = '';
1752                                 } elseif( $media == 'screen' ) {
1753                                         return null;
1754                                 }
1755                         }
1756                 }
1757
1758                 // Expand longer media queries as iPhone doesn't grok 'handheld'
1759                 if( $wgHandheldForIPhone ) {
1760                         $mediaAliases = array(
1761                                 'screen' => 'screen and (min-device-width: 481px)',
1762                                 'handheld' => 'handheld, only screen and (max-device-width: 480px)',
1763                         );
1764
1765                         if( isset( $mediaAliases[$media] ) ) {
1766                                 $media = $mediaAliases[$media];
1767                         }
1768                 }
1769
1770                 return $media;
1771         }
1772
1773         /**
1774          * Turn off regular page output and return an error reponse
1775          * for when rate limiting has triggered.
1776          */
1777         public function rateLimited() {
1778
1779                 $this->setPageTitle(wfMsg('actionthrottled'));
1780                 $this->setRobotPolicy( 'noindex,follow' );
1781                 $this->setArticleRelated( false );
1782                 $this->enableClientCache( false );
1783                 $this->mRedirect = '';
1784                 $this->clearHTML();
1785                 $this->setStatusCode(503);
1786                 $this->addWikiMsg( 'actionthrottledtext' );
1787
1788                 $this->returnToMain( null, $this->getTitle() );
1789         }
1790
1791         /**
1792          * Show an "add new section" link?
1793          *
1794          * @return bool
1795          */
1796         public function showNewSectionLink() {
1797                 return $this->mNewSectionLink;
1798         }
1799
1800         /**
1801         * Forcibly hide the new section link?
1802         *
1803         * @return bool
1804         */
1805         public function forceHideNewSectionLink() {
1806                 return $this->mHideNewSectionLink;
1807         }
1808
1809         /**
1810          * Show a warning about slave lag
1811          *
1812          * If the lag is higher than $wgSlaveLagCritical seconds,
1813          * then the warning is a bit more obvious. If the lag is
1814          * lower than $wgSlaveLagWarning, then no warning is shown.
1815          *
1816          * @param int $lag Slave lag
1817          */
1818         public function showLagWarning( $lag ) {
1819                 global $wgSlaveLagWarning, $wgSlaveLagCritical;
1820                 if( $lag >= $wgSlaveLagWarning ) {
1821                         $message = $lag < $wgSlaveLagCritical
1822                                 ? 'lag-warn-normal'
1823                                 : 'lag-warn-high';
1824                         $warning = wfMsgExt( $message, 'parse', $lag );
1825                         $this->addHTML( "<div class=\"mw-{$message}\">\n{$warning}\n</div>\n" );
1826                 }
1827         }
1828
1829         /**
1830          * Add a wikitext-formatted message to the output.
1831          * This is equivalent to:
1832          *
1833          *    $wgOut->addWikiText( wfMsgNoTrans( ... ) )
1834          */
1835         public function addWikiMsg( /*...*/ ) {
1836                 $args = func_get_args();
1837                 $name = array_shift( $args );
1838                 $this->addWikiMsgArray( $name, $args );
1839         }
1840
1841         /**
1842          * Add a wikitext-formatted message to the output.
1843          * Like addWikiMsg() except the parameters are taken as an array
1844          * instead of a variable argument list.
1845          *
1846          * $options is passed through to wfMsgExt(), see that function for details.
1847          */
1848         public function addWikiMsgArray( $name, $args, $options = array() ) {
1849                 $options[] = 'parse';
1850                 $text = wfMsgExt( $name, $options, $args );
1851                 $this->addHTML( $text );
1852         }
1853
1854         /**
1855          * This function takes a number of message/argument specifications, wraps them in
1856          * some overall structure, and then parses the result and adds it to the output.
1857          *
1858          * In the $wrap, $1 is replaced with the first message, $2 with the second, and so
1859          * on. The subsequent arguments may either be strings, in which case they are the
1860          * message names, or an arrays, in which case the first element is the message name,
1861          * and subsequent elements are the parameters to that message.
1862          *
1863          * The special named parameter 'options' in a message specification array is passed
1864          * through to the $options parameter of wfMsgExt().
1865          *
1866          * Don't use this for messages that are not in users interface language.
1867          *
1868          * For example:
1869          *
1870          *    $wgOut->wrapWikiMsg( '<div class="error">$1</div>', 'some-error' );
1871          *
1872          * Is equivalent to:
1873          *
1874          *    $wgOut->addWikiText( '<div class="error">' . wfMsgNoTrans( 'some-error' ) . '</div>' );
1875          */
1876         public function wrapWikiMsg( $wrap /*, ...*/ ) {
1877                 $msgSpecs = func_get_args();
1878                 array_shift( $msgSpecs );
1879                 $msgSpecs = array_values( $msgSpecs );
1880                 $s = $wrap;
1881                 foreach ( $msgSpecs as $n => $spec ) {
1882                         $options = array();
1883                         if ( is_array( $spec ) ) {
1884                                 $args = $spec;
1885                                 $name = array_shift( $args );
1886                                 if ( isset( $args['options'] ) ) {
1887                                         $options = $args['options'];
1888                                         unset( $args['options'] );
1889                                 }
1890                         }  else {
1891                                 $args = array();
1892                                 $name = $spec;
1893                         }
1894                         $s = str_replace( '$' . ( $n + 1 ), wfMsgExt( $name, $options, $args ), $s );
1895                 }
1896                 $this->addHTML( $this->parse( $s, /*linestart*/true, /*uilang*/true ) );
1897         }
1898 }