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(), $mCategories = array(), $mLanguageLinks = array();
  16
  17         var $mScripts = '', $mLinkColours, $mPageLinkTitle = '', $mHeadItems = array();
  18         var $mInlineMsg = array();
  19
  20         var $mTemplateIds = array();
  21
  22         var $mAllowUserJs;
  23         var $mSuppressQuickbar = false;
  24         var $mDoNothing = false;
  25         var $mContainsOldMagic = 0, $mContainsNewMagic = 0;
  26         var $mIsArticleRelated = true;
  27         protected $mParserOptions = null; // lazy initialised, use parserOptions()
  28
  29         var $mFeedLinks = array();
  30
  31         var $mEnableClientCache = true;
  32         var $mArticleBodyOnly = false;
  33
  34         var $mNewSectionLink = false;
  35         var $mHideNewSectionLink = false;
  36         var $mNoGallery = false;
  37         var $mPageTitleActionText = '';
  38         var $mParseWarnings = array();
  39         var $mSquidMaxage = 0;
  40         var $mRevisionId = null;
  41         protected $mTitle = null;
  42
  43         /**
  44          * An array of stylesheet filenames (relative from skins path), with options
  45          * for CSS media, IE conditions, and RTL/LTR direction.
  46          * For internal use; add settings in the skin via $this->addStyle()
  47          */
  48         var $styles = array();
  49
  50         /**
  51          * Whether to load jQuery core.
  52          */
  53         protected $mJQueryDone = false;
  54
  55         private $mIndexPolicy = 'index';
  56         private $mFollowPolicy = 'follow';
  57         private $mVaryHeader = array( 'Accept-Encoding' => array('list-contains=gzip'),
  58                                                                   'Cookie' => null );
  59
  60
  61         /**
  62          * Constructor
  63          * Initialise private variables
  64          */
  65         function __construct() {
  66                 global $wgAllowUserJs;
  67                 $this->mAllowUserJs = $wgAllowUserJs;
  68         }
  69
  70         /**
  71          * Redirect to $url rather than displaying the normal page
  72          *
  73          * @param $url String: URL
  74          * @param $responsecode String: HTTP status code
  75          */
  76         public function redirect( $url, $responsecode = '302' ) {
  77                 # Strip newlines as a paranoia check for header injection in PHP<5.1.2
  78                 $this->mRedirect = str_replace( "\n", '', $url );
  79                 $this->mRedirectCode = $responsecode;
  80         }
  81
  82         /**
  83          * Get the URL to redirect to, or an empty string if not redirect URL set
  84          *
  85          * @return String
  86          */
  87         public function getRedirect() {
  88                 return $this->mRedirect;
  89         }
  90
  91         /**
  92          * Set the HTTP status code to send with the output.
  93          *
  94          * @param $statusCode Integer
  95          * @return nothing
  96          */
  97         public function setStatusCode( $statusCode ) {
  98                 $this->mStatusCode = $statusCode;
  99         }
 100
 101
 102         /**
 103          * Add a new <meta> tag
 104          * To add an http-equiv meta tag, precede the name with "http:"
 105          *
 106          * @param $name tag name
 107          * @param $val tag value
 108          */
 109         function addMeta( $name, $val ) {
 110                 array_push( $this->mMetatags, array( $name, $val ) );
 111         }
 112
 113         /**
 114          * Add a keyword or a list of keywords in the page header
 115          *
 116          * @param $text String or array of strings
 117          */
 118         function addKeyword( $text ) {
 119                 if( is_array( $text ) ) {
 120                         $this->mKeywords = array_merge( $this->mKeywords, $text );
 121                 } else {
 122                         array_push( $this->mKeywords, $text );
 123                 }
 124         }
 125
 126         /**
 127          * Add a new \<link\> tag to the page header
 128          *
 129          * @param $linkarr Array: associative array of attributes.
 130          */
 131         function addLink( $linkarr ) {
 132                 array_push( $this->mLinktags, $linkarr );
 133         }
 134
 135         /**
 136          * Add a new \<link\> with "rel" attribute set to "meta"
 137          *
 138          * @param $linkarr Array: associative array mapping attribute names to their
 139          *                 values, both keys and values will be escaped, and the
 140          *                 "rel" attribute will be automatically added
 141          */
 142         function addMetadataLink( $linkarr ) {
 143                 # note: buggy CC software only reads first "meta" link
 144                 static $haveMeta = false;
 145                 $linkarr['rel'] = $haveMeta ? 'alternate meta' : 'meta';
 146                 $this->addLink( $linkarr );
 147                 $haveMeta = true;
 148         }
 149
 150
 151         /**
 152          * Add raw HTML to the list of scripts (including \<script\> tag, etc.)
 153          *
 154          * @param $script String: raw HTML
 155          */
 156         function addScript( $script ) {
 157                 $this->mScripts .= $script . "\n";
 158         }
 159
 160         /**
 161          * Register and add a stylesheet from an extension directory.
 162          *
 163          * @param $url String path to sheet.  Provide either a full url (beginning
 164          *             with 'http', etc) or a relative path from the document root
 165          *             (beginning with '/').  Otherwise it behaves identically to
 166          *             addStyle() and draws from the /skins folder.
 167          */
 168         public function addExtensionStyle( $url ) {
 169                 array_push( $this->mExtStyles, $url );
 170         }
 171
 172         /**
 173          * Get all links added by extensions
 174          *
 175          * @return Array
 176          */
 177         function getExtStyle() {
 178                 return $this->mExtStyles;
 179         }
 180
 181         /**
 182          * Add a JavaScript file out of skins/common, or a given relative path.
 183          *
 184          * @param $file String: filename in skins/common or complete on-server path
 185          *              (/foo/bar.js)
 186          */
 187         public function addScriptFile( $file ) {
 188                 global $wgStylePath, $wgStyleVersion;
 189                 if( substr( $file, 0, 1 ) == '/' || substr( $file, 0, 7 ) == 'http://' ) {
 190                         $path = $file;
 191                 } else {
 192                         $path =  "{$wgStylePath}/common/{$file}";
 193                 }
 194                 $this->addScript( Html::linkedScript( wfAppendQuery( $path, $wgStyleVersion ) ) );
 195         }
 196
 197         /**
 198          * Add a self-contained script tag with the given contents
 199          *
 200          * @param $script String: JavaScript text, no <script> tags
 201          */
 202         public function addInlineScript( $script ) {
 203                 $this->mScripts .= Html::inlineScript( "\n$script\n" ) . "\n";
 204         }
 205
 206         /**
 207          * Get all registered JS and CSS tags for the header.
 208          *
 209          * @return String
 210          */
 211         function getScript() {
 212                 return $this->mScripts . $this->getHeadItems();
 213         }
 214
 215         /**
 216          * Get all header items in a string
 217          *
 218          * @return String
 219          */
 220         function getHeadItems() {
 221                 $s = '';
 222                 foreach ( $this->mHeadItems as $item ) {
 223                         $s .= $item;
 224                 }
 225                 return $s;
 226         }
 227
 228         /**
 229          * Add or replace an header item to the output
 230          *
 231          * @param $name String: item name
 232          * @param $value String: raw HTML
 233          */
 234         public function addHeadItem( $name, $value ) {
 235                 $this->mHeadItems[$name] = $value;
 236         }
 237
 238         /**
 239          * Check if the header item $name is already set
 240          *
 241          * @param $name String: item name
 242          * @return Boolean
 243          */
 244         public function hasHeadItem( $name ) {
 245                 return isset( $this->mHeadItems[$name] );
 246         }
 247
 248         /**
 249          * Set the value of the ETag HTTP header, only used if $wgUseETag is true
 250          *
 251          * @param $tag String: value of "ETag" header
 252          */
 253         function setETag( $tag ) {
 254                 $this->mETag = $tag;
 255         }
 256
 257         /**
 258          * Set whether the output should only contain the body of the article,
 259          * without any skin, sidebar, etc.
 260          * Used e.g. when calling with "action=render".
 261          *
 262          * @param $only Boolean: whether to output only the body of the article
 263          */
 264         public function setArticleBodyOnly( $only ) {
 265                 $this->mArticleBodyOnly = $only;
 266         }
 267
 268         /**
 269          * Return whether the output will contain only the body of the article
 270          *
 271          * @return Boolean
 272          */
 273         public function getArticleBodyOnly() {
 274                 return $this->mArticleBodyOnly;
 275         }
 276
 277
 278         /**
 279          * checkLastModified tells the client to use the client-cached page if
 280          * possible. If sucessful, the OutputPage is disabled so that
 281          * any future call to OutputPage->output() have no effect.
 282          *
 283          * Side effect: sets mLastModified for Last-Modified header
 284          *
 285          * @return Boolean: true iff cache-ok headers was sent.
 286          */
 287         public function checkLastModified( $timestamp ) {
 288                 global $wgCachePages, $wgCacheEpoch, $wgUser, $wgRequest;
 289
 290                 if ( !$timestamp || $timestamp == '19700101000000' ) {
 291                         wfDebug( __METHOD__ . ": CACHE DISABLED, NO TIMESTAMP\n" );
 292                         return false;
 293                 }
 294                 if( !$wgCachePages ) {
 295                         wfDebug( __METHOD__ . ": CACHE DISABLED\n", false );
 296                         return false;
 297                 }
 298                 if( $wgUser->getOption( 'nocache' ) ) {
 299                         wfDebug( __METHOD__ . ": USER DISABLED CACHE\n", false );
 300                         return false;
 301                 }
 302
 303                 $timestamp = wfTimestamp( TS_MW, $timestamp );
 304                 $modifiedTimes = array(
 305                         'page' => $timestamp,
 306                         'user' => $wgUser->getTouched(),
 307                         'epoch' => $wgCacheEpoch
 308                 );
 309                 wfRunHooks( 'OutputPageCheckLastModified', array( &$modifiedTimes ) );
 310
 311                 $maxModified = max( $modifiedTimes );
 312                 $this->mLastModified = wfTimestamp( TS_RFC2822, $maxModified );
 313
 314                 if( empty( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) ) {
 315                         wfDebug( __METHOD__ . ": client did not send If-Modified-Since header\n", false );
 316                         return false;
 317                 }
 318
 319                 # Make debug info
 320                 $info = '';
 321                 foreach ( $modifiedTimes as $name => $value ) {
 322                         if ( $info !== '' ) {
 323                                 $info .= ', ';
 324                         }
 325                         $info .= "$name=" . wfTimestamp( TS_ISO_8601, $value );
 326                 }
 327
 328                 # IE sends sizes after the date like this:
 329                 # Wed, 20 Aug 2003 06:51:19 GMT; length=5202
 330                 # this breaks strtotime().
 331                 $clientHeader = preg_replace( '/;.*$/', '', $_SERVER["HTTP_IF_MODIFIED_SINCE"] );
 332
 333                 wfSuppressWarnings(); // E_STRICT system time bitching
 334                 $clientHeaderTime = strtotime( $clientHeader );
 335                 wfRestoreWarnings();
 336                 if ( !$clientHeaderTime ) {
 337                         wfDebug( __METHOD__ . ": unable to parse the client's If-Modified-Since header: $clientHeader\n" );
 338                         return false;
 339                 }
 340                 $clientHeaderTime = wfTimestamp( TS_MW, $clientHeaderTime );
 341
 342                 wfDebug( __METHOD__ . ": client sent If-Modified-Since: " .
 343                         wfTimestamp( TS_ISO_8601, $clientHeaderTime ) . "\n", false );
 344                 wfDebug( __METHOD__ . ": effective Last-Modified: " .
 345                         wfTimestamp( TS_ISO_8601, $maxModified ) . "\n", false );
 346                 if( $clientHeaderTime < $maxModified ) {
 347                         wfDebug( __METHOD__ . ": STALE, $info\n", false );
 348                         return false;
 349                 }
 350
 351                 # Not modified
 352                 # Give a 304 response code and disable body output
 353                 wfDebug( __METHOD__ . ": NOT MODIFIED, $info\n", false );
 354                 ini_set('zlib.output_compression', 0);
 355                 $wgRequest->response()->header( "HTTP/1.1 304 Not Modified" );
 356                 $this->sendCacheControl();
 357                 $this->disable();
 358
 359                 // Don't output a compressed blob when using ob_gzhandler;
 360                 // it's technically against HTTP spec and seems to confuse
 361                 // Firefox when the response gets split over two packets.
 362                 wfClearOutputBuffers();
 363
 364                 return true;
 365         }
 366
 367
 368         /**
 369          * Set the robot policy for the page: <http://www.robotstxt.org/meta.html>
 370          *
 371          * @param $policy String: the literal string to output as the contents of
 372          *   the meta tag.  Will be parsed according to the spec and output in
 373          *   standardized form.
 374          * @return null
 375          */
 376         public function setRobotPolicy( $policy ) {
 377                 $policy = Article::formatRobotPolicy( $policy );
 378
 379                 if( isset( $policy['index'] ) ){
 380                         $this->setIndexPolicy( $policy['index'] );
 381                 }
 382                 if( isset( $policy['follow'] ) ){
 383                         $this->setFollowPolicy( $policy['follow'] );
 384                 }
 385         }
 386
 387         /**
 388          * Set the index policy for the page, but leave the follow policy un-
 389          * touched.
 390          *
 391          * @param $policy string Either 'index' or 'noindex'.
 392          * @return null
 393          */
 394         public function setIndexPolicy( $policy ) {
 395                 $policy = trim( $policy );
 396                 if( in_array( $policy, array( 'index', 'noindex' ) ) ) {
 397                         $this->mIndexPolicy = $policy;
 398                 }
 399         }
 400
 401         /**
 402          * Set the follow policy for the page, but leave the index policy un-
 403          * touched.
 404          *
 405          * @param $policy String: either 'follow' or 'nofollow'.
 406          * @return null
 407          */
 408         public function setFollowPolicy( $policy ) {
 409                 $policy = trim( $policy );
 410                 if( in_array( $policy, array( 'follow', 'nofollow' ) ) ) {
 411                         $this->mFollowPolicy = $policy;
 412                 }
 413         }
 414
 415
 416         /**
 417          * Set the new value of the "action text", this will be added to the
 418          * "HTML title", separated from it with " - ".
 419          *
 420          * @param $text String: new value of the "action text"
 421          */
 422         public function setPageTitleActionText( $text ) {
 423                 $this->mPageTitleActionText = $text;
 424         }
 425
 426         /**
 427          * Get the value of the "action text"
 428          *
 429          * @return String
 430          */
 431         public function getPageTitleActionText() {
 432                 if ( isset( $this->mPageTitleActionText ) ) {
 433                         return $this->mPageTitleActionText;
 434                 }
 435         }
 436
 437         /**
 438          * "HTML title" means the contents of <title>. It is stored as plain, unescaped text and will be run through htmlspecialchars in the skin file.
 439          */
 440         public function setHTMLTitle( $name ) {
 441                 $this->mHTMLtitle = $name;
 442         }
 443
 444         /**
 445          * Return the "HTML title", i.e. the content of the <title> tag.
 446          *
 447          * @return String
 448          */
 449         public function getHTMLTitle() {
 450                 return $this->mHTMLtitle;
 451         }
 452
 453         /**
 454          * "Page title" means the contents of \<h1\>. It is stored as a valid HTML fragment.
 455          * This function allows good tags like \<sup\> in the \<h1\> tag, but not bad tags like \<script\>.
 456          * This function automatically sets \<title\> to the same content as \<h1\> but with all tags removed.
 457          * Bad tags that were escaped in \<h1\> will still be escaped in \<title\>, and good tags like \<i\> will be dropped entirely.
 458          */
 459         public function setPageTitle( $name ) {
 460                 # change "<script>foo&bar</script>" to "&lt;script&gt;foo&amp;bar&lt;/script&gt;"
 461                 # but leave "<i>foobar</i>" alone
 462                 $nameWithTags = Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags( $name ) );
 463                 $this->mPagetitle = $nameWithTags;
 464
 465                 $taction =  $this->getPageTitleActionText();
 466                 if( !empty( $taction ) ) {
 467                         $name .= ' - '.$taction;
 468                 }
 469
 470                 # change "<i>foo&amp;bar</i>" to "foo&bar"
 471                 $this->setHTMLTitle( wfMsg( 'pagetitle', Sanitizer::stripAllTags( $nameWithTags ) ) );
 472         }
 473
 474         /**
 475          * Return the "page title", i.e. the content of the \<h1\> tag.
 476          *
 477          * @return String
 478          */
 479         public function getPageTitle() {
 480                 return $this->mPagetitle;
 481         }
 482
 483         /**
 484          * Set the Title object to use
 485          *
 486          * @param $t Title object
 487          */
 488         public function setTitle( $t ) {
 489                 $this->mTitle = $t;
 490         }
 491
 492         /**
 493          * Get the Title object used in this instance
 494          *
 495          * @return Title
 496          */
 497         public function getTitle() {
 498                 if ( $this->mTitle instanceof Title ) {
 499                         return $this->mTitle;
 500                 } else {
 501                         wfDebug( __METHOD__ . ' called and $mTitle is null. Return $wgTitle for sanity' );
 502                         global $wgTitle;
 503                         return $wgTitle;
 504                 }
 505         }
 506
 507         /**
 508          * Replace the subtile with $str
 509          *
 510          * @param $str String: new value of the subtitle
 511          */
 512         public function setSubtitle( $str ) {
 513                 $this->mSubtitle = /*$this->parse(*/ $str /*)*/; // @bug 2514
 514         }
 515
 516         /**
 517          * Add $str to the subtitle
 518          *
 519          * @param $str String to add to the subtitle
 520          */
 521         public function appendSubtitle( $str ) {
 522                 $this->mSubtitle .= /*$this->parse(*/ $str /*)*/; // @bug 2514
 523         }
 524
 525         /**
 526          * Get the subtitle
 527          *
 528          * @return String
 529          */
 530         public function getSubtitle() {
 531                 return $this->mSubtitle;
 532         }
 533
 534
 535         /**
 536          * Set the page as printable, i.e. it'll be displayed with with all
 537          * print styles included
 538          */
 539         public function setPrintable() {
 540                 $this->mPrintable = true;
 541         }
 542
 543         /**
 544          * Return whether the page is "printable"
 545          *
 546          * @return Boolean
 547          */
 548         public function isPrintable() {
 549                 return $this->mPrintable;
 550         }
 551
 552
 553         /**
 554          * Disable output completely, i.e. calling output() will have no effect
 555          */
 556         public function disable() {
 557                 $this->mDoNothing = true;
 558         }
 559
 560         /**
 561          * Return whether the output will be completely disabled
 562          *
 563          * @return Boolean
 564          */
 565         public function isDisabled() {
 566                 return $this->mDoNothing;
 567         }
 568
 569
 570         /**
 571          * Show an "add new section" link?
 572          *
 573          * @return Boolean
 574          */
 575         public function showNewSectionLink() {
 576                 return $this->mNewSectionLink;
 577         }
 578
 579         /**
 580          * Forcibly hide the new section link?
 581          *
 582          * @return Boolean
 583          */
 584         public function forceHideNewSectionLink() {
 585                 return $this->mHideNewSectionLink;
 586         }
 587
 588
 589         /**
 590          * Add or remove feed links in the page header
 591          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
 592          * for the new version
 593          * @see addFeedLink()
 594          *
 595          * @param $show Boolean: true: add default feeds, false: remove all feeds
 596          */
 597         public function setSyndicated( $show = true ) {
 598                 if ( $show ) {
 599                         $this->setFeedAppendQuery( false );
 600                 } else {
 601                         $this->mFeedLinks = array();
 602                 }
 603         }
 604
 605         /**
 606          * Add default feeds to the page header
 607          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
 608          * for the new version
 609          * @see addFeedLink()
 610          *
 611          * @param $val String: query to append to feed links or false to output
 612          *        default links
 613          */
 614         public function setFeedAppendQuery( $val ) {
 615                 global $wgAdvertisedFeedTypes;
 616
 617                 $this->mFeedLinks = array();
 618
 619                 foreach ( $wgAdvertisedFeedTypes as $type ) {
 620                         $query = "feed=$type";
 621                         if ( is_string( $val ) ) {
 622                                 $query .= '&' . $val;
 623                         }
 624                         $this->mFeedLinks[$type] = $this->getTitle()->getLocalURL( $query );
 625                 }
 626         }
 627
 628         /**
 629          * Add a feed link to the page header
 630          *
 631          * @param $format String: feed type, should be a key of $wgFeedClasses
 632          * @param $href String: URL
 633          */
 634         public function addFeedLink( $format, $href ) {
 635                 $this->mFeedLinks[$format] = $href;
 636         }
 637
 638         /**
 639          * Should we output feed links for this page?
 640          * @return Boolean
 641          */
 642         public function isSyndicated() {
 643                 return count( $this->mFeedLinks ) > 0;
 644         }
 645
 646         /**
 647          * Return URLs for each supported syndication format for this page.
 648          * @return array associating format keys with URLs
 649          */
 650         public function getSyndicationLinks() {
 651                 return $this->mFeedLinks;
 652         }
 653
 654         /**
 655          * Will currently always return null
 656          *
 657          * @return null
 658          */
 659         public function getFeedAppendQuery() {
 660                 return $this->mFeedLinksAppendQuery;
 661         }
 662
 663         /**
 664          * Set whether the displayed content is related to the source of the
 665          * corresponding article on the wiki
 666          * Setting true will cause the change "article related" toggle to true
 667          *
 668          * @param $v Boolean
 669          */
 670         public function setArticleFlag( $v ) {
 671                 $this->mIsarticle = $v;
 672                 if ( $v ) {
 673                         $this->mIsArticleRelated = $v;
 674                 }
 675         }
 676
 677         /**
 678          * Return whether the content displayed page is related to the source of
 679          * the corresponding article on the wiki
 680          *
 681          * @return Boolean
 682          */
 683         public function isArticle() {
 684                 return $this->mIsarticle;
 685         }
 686
 687         /**
 688          * Set whether this page is related an article on the wiki
 689          * Setting false will cause the change of "article flag" toggle to false
 690          *
 691          * @param $v Boolean
 692          */
 693         public function setArticleRelated( $v ) {
 694                 $this->mIsArticleRelated = $v;
 695                 if ( !$v ) {
 696                         $this->mIsarticle = false;
 697                 }
 698         }
 699
 700         /**
 701          * Return whether this page is related an article on the wiki
 702          *
 703          * @return Boolean
 704          */
 705         public function isArticleRelated() {
 706                 return $this->mIsArticleRelated;
 707         }
 708
 709
 710         /**
 711          * Add new language links
 712          *
 713          * @param $newLinkArray Associative array mapping language code to the page
 714          *                      name
 715          */
 716         public function addLanguageLinks( $newLinkArray ) {
 717                 $this->mLanguageLinks += $newLinkArray;
 718         }
 719
 720         /**
 721          * Reset the language links and add new language links
 722          *
 723          * @param $newLinkArray Associative array mapping language code to the page
 724          *                      name
 725          */
 726         public function setLanguageLinks( $newLinkArray ) {
 727                 $this->mLanguageLinks = $newLinkArray;
 728         }
 729
 730         /**
 731          * Get the list of language links
 732          *
 733          * @return Associative array mapping language code to the page name
 734          */
 735         public function getLanguageLinks() {
 736                 return $this->mLanguageLinks;
 737         }
 738
 739
 740         /**
 741          * Add an array of categories, with names in the keys
 742          *
 743          * @param $categories Associative array mapping category name to its sort key
 744          */
 745         public function addCategoryLinks( $categories ) {
 746                 global $wgUser, $wgContLang;
 747
 748                 if ( !is_array( $categories ) || count( $categories ) == 0 ) {
 749                         return;
 750                 }
 751
 752                 # Add the links to a LinkBatch
 753                 $arr = array( NS_CATEGORY => $categories );
 754                 $lb = new LinkBatch;
 755                 $lb->setArray( $arr );
 756
 757                 # Fetch existence plus the hiddencat property
 758                 $dbr = wfGetDB( DB_SLAVE );
 759                 $pageTable = $dbr->tableName( 'page' );
 760                 $where = $lb->constructSet( 'page', $dbr );
 761                 $propsTable = $dbr->tableName( 'page_props' );
 762                 $sql = "SELECT page_id, page_namespace, page_title, page_len, page_is_redirect, pp_value
 763                         FROM $pageTable LEFT JOIN $propsTable ON pp_propname='hiddencat' AND pp_page=page_id WHERE $where";
 764                 $res = $dbr->query( $sql, __METHOD__ );
 765
 766                 # Add the results to the link cache
 767                 $lb->addResultToCache( LinkCache::singleton(), $res );
 768
 769                 # Set all the values to 'normal'. This can be done with array_fill_keys in PHP 5.2.0+
 770                 $categories = array_combine( array_keys( $categories ),
 771                         array_fill( 0, count( $categories ), 'normal' ) );
 772
 773                 # Mark hidden categories
 774                 foreach ( $res as $row ) {
 775                         if ( isset( $row->pp_value ) ) {
 776                                 $categories[$row->page_title] = 'hidden';
 777                         }
 778                 }
 779
 780                 # Add the remaining categories to the skin
 781                 if ( wfRunHooks( 'OutputPageMakeCategoryLinks', array( &$this, $categories, &$this->mCategoryLinks ) ) ) {
 782                         $sk = $wgUser->getSkin();
 783                         foreach ( $categories as $category => $type ) {
 784                                 $origcategory = $category;
 785                                 $title = Title::makeTitleSafe( NS_CATEGORY, $category );
 786                                 $wgContLang->findVariantLink( $category, $title, true );
 787                                 if ( $category != $origcategory )
 788                                         if ( array_key_exists( $category, $categories ) )
 789                                                 continue;
 790                                 $text = $wgContLang->convertHtml( $title->getText() );
 791                                 $this->mCategories[] = $title->getText();
 792                                 $this->mCategoryLinks[$type][] = $sk->link( $title, $text );
 793                         }
 794                 }
 795         }
 796
 797         /**
 798          * Reset the category links (but not the category list) and add $categories
 799          *
 800          * @param $categories Associative array mapping category name to its sort key
 801          */
 802         public function setCategoryLinks( $categories ) {
 803                 $this->mCategoryLinks = array();
 804                 $this->addCategoryLinks( $categories );
 805         }
 806
 807         /**
 808          * Get the list of category links, in a 2-D array with the following format:
 809          * $arr[$type][] = $link, where $type is either "normal" or "hidden" (for
 810          * hidden categories) and $link a HTML fragment with a link to the category
 811          * page
 812          *
 813          * @return Array
 814          */
 815         public function getCategoryLinks() {
 816                 return $this->mCategoryLinks;
 817         }
 818
 819         /**
 820          * Get the list of category names this page belongs to
 821          *
 822          * @return Array of strings
 823          */
 824         public function getCategories() {
 825                 return $this->mCategories;
 826         }
 827
 828
 829         /**
 830          * Suppress the quickbar from the output, only for skin supporting
 831          * the quickbar
 832          */
 833         public function suppressQuickbar() {
 834                 $this->mSuppressQuickbar = true;
 835         }
 836
 837         /**
 838          * Return whether the quickbar should be suppressed from the output
 839          *
 840          * @return Boolean
 841          */
 842         public function isQuickbarSuppressed() {
 843                 return $this->mSuppressQuickbar;
 844         }
 845
 846
 847         /**
 848          * Remove user JavaScript from scripts to load
 849          */
 850         public function disallowUserJs() {
 851                 $this->mAllowUserJs = false;
 852         }
 853
 854         /**
 855          * Return whether user JavaScript is allowed for this page
 856          *
 857          * @return Boolean
 858          */
 859         public function isUserJsAllowed() {
 860                 return $this->mAllowUserJs;
 861         }
 862
 863
 864         /**
 865          * Prepend $text to the body HTML
 866          *
 867          * @param $text String: HTML
 868          */
 869         public function prependHTML( $text ) {
 870                 $this->mBodytext = $text . $this->mBodytext;
 871         }
 872
 873         /**
 874          * Append $text to the body HTML
 875          *
 876          * @param $text String: HTML
 877          */
 878         public function addHTML( $text ) {
 879                 $this->mBodytext .= $text;
 880         }
 881
 882         /**
 883          * Clear the body HTML
 884          */
 885         public function clearHTML() {
 886                 $this->mBodytext = '';
 887         }
 888
 889         /**
 890          * Get the body HTML
 891          *
 892          * @return String: HTML
 893          */
 894         public function getHTML() {
 895                 return $this->mBodytext;
 896         }
 897
 898
 899         /**
 900          * Add $text to the debug output
 901          *
 902          * @param $text String: debug text
 903          */
 904         public function debug( $text ) {
 905                 $this->mDebugtext .= $text;
 906         }
 907
 908
 909         /**
 910          * @deprecated use parserOptions() instead
 911          */
 912         public function setParserOptions( $options ) {
 913                 wfDeprecated( __METHOD__ );
 914                 return $this->parserOptions( $options );
 915         }
 916
 917         /**
 918          * Get/set the ParserOptions object to use for wikitext parsing
 919          *
 920          * @param $options either the ParserOption to use or null to only get the
 921          *                 current ParserOption object
 922          * @return current ParserOption object
 923          */
 924         public function parserOptions( $options = null ) {
 925                 if ( !$this->mParserOptions ) {
 926                         $this->mParserOptions = new ParserOptions;
 927                 }
 928                 return wfSetVar( $this->mParserOptions, $options );
 929         }
 930
 931         /**
 932          * Set the revision ID which will be seen by the wiki text parser
 933          * for things such as embedded {{REVISIONID}} variable use.
 934          *
 935          * @param $revid Mixed: an positive integer, or null
 936          * @return Mixed: previous value
 937          */
 938         public function setRevisionId( $revid ) {
 939                 $val = is_null( $revid ) ? null : intval( $revid );
 940                 return wfSetVar( $this->mRevisionId, $val );
 941         }
 942
 943         /**
 944          * Get the current revision ID
 945          *
 946          * @return Integer
 947          */
 948         public function getRevisionId() {
 949                 return $this->mRevisionId;
 950         }
 951
 952         /**
 953          * Convert wikitext to HTML and add it to the buffer
 954          * Default assumes that the current page title will be used.
 955          *
 956          * @param $text String
 957          * @param $linestart Boolean: is this the start of a line?
 958          */
 959         public function addWikiText( $text, $linestart = true ) {
 960                 $title = $this->getTitle(); // Work arround E_STRICT
 961                 $this->addWikiTextTitle( $text, $title, $linestart );
 962         }
 963
 964         /**
 965          * Add wikitext with a custom Title object
 966          *
 967          * @param $text String: wikitext
 968          * @param $title Title object
 969          * @param $linestart Boolean: is this the start of a line?
 970          */
 971         public function addWikiTextWithTitle( $text, &$title, $linestart = true ) {
 972                 $this->addWikiTextTitle( $text, $title, $linestart );
 973         }
 974
 975         /**
 976          * Add wikitext with a custom Title object and
 977          *
 978          * @param $text String: wikitext
 979          * @param $title Title object
 980          * @param $linestart Boolean: is this the start of a line?
 981          */
 982         function addWikiTextTitleTidy( $text, &$title, $linestart = true ) {
 983                 $this->addWikiTextTitle( $text, $title, $linestart, true );
 984         }
 985
 986         /**
 987          * Add wikitext with tidy enabled
 988          *
 989          * @param $text String: wikitext
 990          * @param $linestart Boolean: is this the start of a line?
 991          */
 992         public function addWikiTextTidy( $text, $linestart = true ) {
 993                 $title = $this->getTitle();
 994                 $this->addWikiTextTitleTidy($text, $title, $linestart);
 995         }
 996
 997         /**
 998          * Add wikitext with a custom Title object
 999          *
1000          * @param $text String: wikitext
1001          * @param $title Title object
1002          * @param $linestart Boolean: is this the start of a line?
1003          * @param $tidy Boolean: whether to use tidy
1004          */
1005         public function addWikiTextTitle( $text, &$title, $linestart, $tidy = false ) {
1006                 global $wgParser;
1007
1008                 wfProfileIn( __METHOD__ );
1009
1010                 wfIncrStats( 'pcache_not_possible' );
1011
1012                 $popts = $this->parserOptions();
1013                 $oldTidy = $popts->setTidy( $tidy );
1014
1015                 $parserOutput = $wgParser->parse( $text, $title, $popts,
1016                         $linestart, true, $this->mRevisionId );
1017
1018                 $popts->setTidy( $oldTidy );
1019
1020                 $this->addParserOutput( $parserOutput );
1021
1022                 wfProfileOut( __METHOD__ );
1023         }
1024
1025         /**
1026          * Add wikitext to the buffer, assuming that this is the primary text for a page view
1027          * Saves the text into the parser cache if possible.
1028          *
1029          * @param $text String: wikitext
1030          * @param $article Article object
1031          * @param $cache Boolean
1032          * @deprecated Use Article::outputWikitext
1033          */
1034         public function addPrimaryWikiText( $text, $article, $cache = true ) {
1035                 global $wgParser;
1036
1037                 wfDeprecated( __METHOD__ );
1038
1039                 $popts = $this->parserOptions();
1040                 $popts->setTidy(true);
1041                 $parserOutput = $wgParser->parse( $text, $article->mTitle,
1042                         $popts, true, true, $this->mRevisionId );
1043                 $popts->setTidy(false);
1044                 if ( $cache && $article && $parserOutput->getCacheTime() != -1 ) {
1045                         $parserCache = ParserCache::singleton();
1046                         $parserCache->save( $parserOutput, $article, $popts);
1047                 }
1048
1049                 $this->addParserOutput( $parserOutput );
1050         }
1051
1052         /**
1053          * @deprecated use addWikiTextTidy()
1054          */
1055         public function addSecondaryWikiText( $text, $linestart = true ) {
1056                 wfDeprecated( __METHOD__ );
1057                 $this->addWikiTextTitleTidy($text, $this->getTitle(), $linestart);
1058         }
1059
1060
1061         /**
1062          * Add a ParserOutput object, but without Html
1063          *
1064          * @param $parserOutput ParserOutput object
1065          */
1066         public function addParserOutputNoText( &$parserOutput ) {
1067                 global $wgExemptFromUserRobotsControl, $wgContentNamespaces;
1068
1069                 $this->mLanguageLinks += $parserOutput->getLanguageLinks();
1070                 $this->addCategoryLinks( $parserOutput->getCategories() );
1071                 $this->mNewSectionLink = $parserOutput->getNewSection();
1072                 $this->mHideNewSectionLink = $parserOutput->getHideNewSection();
1073
1074                 $this->mParseWarnings = $parserOutput->getWarnings();
1075                 if ( $parserOutput->getCacheTime() == -1 ) {
1076                         $this->enableClientCache( false );
1077                 }
1078                 $this->mNoGallery = $parserOutput->getNoGallery();
1079                 $this->mHeadItems = array_merge( $this->mHeadItems, $parserOutput->getHeadItems() );
1080                 // Versioning...
1081                 foreach ( (array)$parserOutput->mTemplateIds as $ns => $dbks ) {
1082                         if ( isset( $this->mTemplateIds[$ns] ) ) {
1083                                 $this->mTemplateIds[$ns] = $dbks + $this->mTemplateIds[$ns];
1084                         } else {
1085                                 $this->mTemplateIds[$ns] = $dbks;
1086                         }
1087                 }
1088                 // Page title
1089                 $title = $parserOutput->getTitleText();
1090                 if ( $title != '' ) {
1091                         $this->setPageTitle( $title );
1092                 }
1093
1094                 // Hooks registered in the object
1095                 global $wgParserOutputHooks;
1096                 foreach ( $parserOutput->getOutputHooks() as $hookInfo ) {
1097                         list( $hookName, $data ) = $hookInfo;
1098                         if ( isset( $wgParserOutputHooks[$hookName] ) ) {
1099                                 call_user_func( $wgParserOutputHooks[$hookName], $this, $parserOutput, $data );
1100                         }
1101                 }
1102
1103                 wfRunHooks( 'OutputPageParserOutput', array( &$this, $parserOutput ) );
1104         }
1105
1106         /**
1107          * Add a ParserOutput object
1108          *
1109          * @param $parserOutput ParserOutput
1110          */
1111         function addParserOutput( &$parserOutput ) {
1112                 $this->addParserOutputNoText( $parserOutput );
1113                 $text = $parserOutput->getText();
1114                 wfRunHooks( 'OutputPageBeforeHTML',array( &$this, &$text ) );
1115                 $this->addHTML( $text );
1116         }
1117
1118
1119         /**
1120          * Add the output of a QuickTemplate to the output buffer
1121          *
1122          * @param $template QuickTemplate
1123          */
1124         public function addTemplate( &$template ) {
1125                 ob_start();
1126                 $template->execute();
1127                 $this->addHTML( ob_get_contents() );
1128                 ob_end_clean();
1129         }
1130
1131         /**
1132          * Parse wikitext and return the HTML.
1133          *
1134          * @param $text String
1135          * @param $linestart Boolean: is this the start of a line?
1136          * @param $interface Boolean: use interface language ($wgLang instead of
1137          *                   $wgContLang) while parsing language sensitive magic
1138          *                   words like GRAMMAR and PLURAL
1139          * @return String: HTML
1140          */
1141         public function parse( $text, $linestart = true, $interface = false ) {
1142                 global $wgParser;
1143                 if( is_null( $this->getTitle() ) ) {
1144                         throw new MWException( 'Empty $mTitle in ' . __METHOD__ );
1145                 }
1146                 $popts = $this->parserOptions();
1147                 if ( $interface) { $popts->setInterfaceMessage(true); }
1148                 $parserOutput = $wgParser->parse( $text, $this->getTitle(), $popts,
1149                         $linestart, true, $this->mRevisionId );
1150                 if ( $interface) { $popts->setInterfaceMessage(false); }
1151                 return $parserOutput->getText();
1152         }
1153
1154         /**
1155          * Parse wikitext, strip paragraphs, and return the HTML.
1156          *
1157          * @param $text String
1158          * @param $linestart Boolean: is this the start of a line?
1159          * @param $interface Boolean: use interface language ($wgLang instead of
1160          *                   $wgContLang) while parsing language sensitive magic
1161          *                   words like GRAMMAR and PLURAL
1162          * @return String: HTML
1163          */
1164         public function parseInline( $text, $linestart = true, $interface = false ) {
1165                 $parsed = $this->parse( $text, $linestart, $interface );
1166
1167                 $m = array();
1168                 if ( preg_match( '/^<p>(.*)\n?<\/p>\n?/sU', $parsed, $m ) ) {
1169                         $parsed = $m[1];
1170                 }
1171
1172                 return $parsed;
1173         }
1174
1175         /**
1176          * @deprecated
1177          *
1178          * @param $article Article
1179          * @return Boolean: true if successful, else false.
1180          */
1181         public function tryParserCache( &$article ) {
1182                 wfDeprecated( __METHOD__ );
1183                 $parserOutput = ParserCache::singleton()->get( $article, $article->getParserOptions() );
1184
1185                 if ($parserOutput !== false) {
1186                         $this->addParserOutput( $parserOutput );
1187                         return true;
1188                 } else {
1189                         return false;
1190                 }
1191         }
1192
1193         /**
1194          * Set the value of the "s-maxage" part of the "Cache-control" HTTP header
1195          *
1196          * @param $maxage Integer: maximum cache time on the Squid, in seconds.
1197          */
1198         public function setSquidMaxage( $maxage ) {
1199                 $this->mSquidMaxage = $maxage;
1200         }
1201
1202         /**
1203          * Use enableClientCache(false) to force it to send nocache headers
1204          *
1205          * @param $state ??
1206          */
1207         public function enableClientCache( $state ) {
1208                 return wfSetVar( $this->mEnableClientCache, $state );
1209         }
1210
1211         /**
1212          * Get the list of cookies that will influence on the cache
1213          *
1214          * @return Array
1215          */
1216         function getCacheVaryCookies() {
1217                 global $wgCookiePrefix, $wgCacheVaryCookies;
1218                 static $cookies;
1219                 if ( $cookies === null ) {
1220                         $cookies = array_merge(
1221                                 array(
1222                                         "{$wgCookiePrefix}Token",
1223                                         "{$wgCookiePrefix}LoggedOut",
1224                                         session_name()
1225                                 ),
1226                                 $wgCacheVaryCookies
1227                         );
1228                         wfRunHooks('GetCacheVaryCookies', array( $this, &$cookies ) );
1229                 }
1230                 return $cookies;
1231         }
1232
1233         /**
1234          * Return whether this page is not cacheable because "useskin" or "uselang"
1235          * url parameters were passed
1236          *
1237          * @return Boolean
1238          */
1239         function uncacheableBecauseRequestVars() {
1240                 global $wgRequest;
1241                 return $wgRequest->getText('useskin', false) === false
1242                         && $wgRequest->getText('uselang', false) === false;
1243         }
1244
1245         /**
1246          * Check if the request has a cache-varying cookie header
1247          * If it does, it's very important that we don't allow public caching
1248          *
1249          * @return Boolean
1250          */
1251         function haveCacheVaryCookies() {
1252                 global $wgRequest;
1253                 $cookieHeader = $wgRequest->getHeader( 'cookie' );
1254                 if ( $cookieHeader === false ) {
1255                         return false;
1256                 }
1257                 $cvCookies = $this->getCacheVaryCookies();
1258                 foreach ( $cvCookies as $cookieName ) {
1259                         # Check for a simple string match, like the way squid does it
1260                         if ( strpos( $cookieHeader, $cookieName ) ) {
1261                                 wfDebug( __METHOD__.": found $cookieName\n" );
1262                                 return true;
1263                         }
1264                 }
1265                 wfDebug( __METHOD__.": no cache-varying cookies found\n" );
1266                 return false;
1267         }
1268
1269         /**
1270          * Add an HTTP header that will influence on the cache
1271          *
1272          * @param $header String: header name
1273          * @param $option either an Array or null
1274          */
1275         public function addVaryHeader( $header, $option = null ) {
1276                 if ( !array_key_exists( $header, $this->mVaryHeader ) ) {
1277                         $this->mVaryHeader[$header] = $option;
1278                 }
1279                 elseif( is_array( $option ) ) {
1280                         if( is_array( $this->mVaryHeader[$header] ) ) {
1281                                 $this->mVaryHeader[$header] = array_merge( $this->mVaryHeader[$header], $option );
1282                         }
1283                         else {
1284                                 $this->mVaryHeader[$header] = $option;
1285                         }
1286                 }
1287                 $this->mVaryHeader[$header] = array_unique( $this->mVaryHeader[$header] );
1288         }
1289
1290         /**
1291          * Get a complete X-Vary-Options header
1292          *
1293          * @return String
1294          */
1295         public function getXVO() {
1296                 $cvCookies = $this->getCacheVaryCookies();
1297
1298                 $cookiesOption = array();
1299                 foreach ( $cvCookies as $cookieName ) {
1300                         $cookiesOption[] = 'string-contains=' . $cookieName;
1301                 }
1302                 $this->addVaryHeader( 'Cookie', $cookiesOption );
1303
1304                 $headers = array();
1305                 foreach( $this->mVaryHeader as $header => $option ) {
1306                         $newheader = $header;
1307                         if( is_array( $option ) )
1308                                 $newheader .= ';' . implode( ';', $option );
1309                         $headers[] = $newheader;
1310                 }
1311                 $xvo = 'X-Vary-Options: ' . implode( ',', $headers );
1312
1313                 return $xvo;
1314         }
1315
1316         /**
1317          * bug 21672: Add Accept-Language to Vary and XVO headers
1318          * if there's no 'variant' parameter existed in GET.
1319          *
1320          * For example:
1321          *   /w/index.php?title=Main_page should always be served; but
1322          *   /w/index.php?title=Main_page&variant=zh-cn should never be served.
1323          *
1324          * patched by Liangent and Philip
1325          */
1326         function addAcceptLanguage() {
1327                 global $wgRequest, $wgContLang;
1328                 if( !$wgRequest->getCheck('variant') && $wgContLang->hasVariants() ) {
1329                         $variants = $wgContLang->getVariants();
1330                         $aloption = array();
1331                         foreach ( $variants as $variant ) {
1332                                 if( $variant === $wgContLang->getCode() )
1333                                         continue;
1334                                 else
1335                                         $aloption[] = "string-contains=$variant";
1336                         }
1337                         $this->addVaryHeader( 'Accept-Language', $aloption );
1338                 }
1339         }
1340
1341         /**
1342          * Send cache control HTTP headers
1343          */
1344         public function sendCacheControl() {
1345                 global $wgUseSquid, $wgUseESI, $wgUseETag, $wgSquidMaxage, $wgRequest, $wgUseXVO;
1346
1347                 $response = $wgRequest->response();
1348                 if ($wgUseETag && $this->mETag)
1349                         $response->header("ETag: $this->mETag");
1350
1351                 $this->addAcceptLanguage();
1352
1353                 # don't serve compressed data to clients who can't handle it
1354                 # maintain different caches for logged-in users and non-logged in ones
1355                 $response->header( 'Vary: ' . join( ', ', array_keys( $this->mVaryHeader ) ) );
1356
1357                 if ( $wgUseXVO ) {
1358                         # Add an X-Vary-Options header for Squid with Wikimedia patches
1359                         $response->header( $this->getXVO() );
1360                 }
1361
1362                 if( !$this->uncacheableBecauseRequestVars() && $this->mEnableClientCache ) {
1363                         if( $wgUseSquid && session_id() == '' &&
1364                           ! $this->isPrintable() && $this->mSquidMaxage != 0 && !$this->haveCacheVaryCookies() )
1365                         {
1366                                 if ( $wgUseESI ) {
1367                                         # We'll purge the proxy cache explicitly, but require end user agents
1368                                         # to revalidate against the proxy on each visit.
1369                                         # Surrogate-Control controls our Squid, Cache-Control downstream caches
1370                                         wfDebug( __METHOD__ . ": proxy caching with ESI; {$this->mLastModified} **\n", false );
1371                                         # start with a shorter timeout for initial testing
1372                                         # header( 'Surrogate-Control: max-age=2678400+2678400, content="ESI/1.0"');
1373                                         $response->header( 'Surrogate-Control: max-age='.$wgSquidMaxage.'+'.$this->mSquidMaxage.', content="ESI/1.0"');
1374                                         $response->header( 'Cache-Control: s-maxage=0, must-revalidate, max-age=0' );
1375                                 } else {
1376                                         # We'll purge the proxy cache for anons explicitly, but require end user agents
1377                                         # to revalidate against the proxy on each visit.
1378                                         # IMPORTANT! The Squid needs to replace the Cache-Control header with
1379                                         # Cache-Control: s-maxage=0, must-revalidate, max-age=0
1380                                         wfDebug( __METHOD__ . ": local proxy caching; {$this->mLastModified} **\n", false );
1381                                         # start with a shorter timeout for initial testing
1382                                         # header( "Cache-Control: s-maxage=2678400, must-revalidate, max-age=0" );
1383                                         $response->header( 'Cache-Control: s-maxage='.$this->mSquidMaxage.', must-revalidate, max-age=0' );
1384                                 }
1385                         } else {
1386                                 # We do want clients to cache if they can, but they *must* check for updates
1387                                 # on revisiting the page.
1388                                 wfDebug( __METHOD__ . ": private caching; {$this->mLastModified} **\n", false );
1389                                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1390                                 $response->header( "Cache-Control: private, must-revalidate, max-age=0" );
1391                         }
1392                         if($this->mLastModified) {
1393                                 $response->header( "Last-Modified: {$this->mLastModified}" );
1394                         }
1395                 } else {
1396                         wfDebug( __METHOD__ . ": no caching **\n", false );
1397
1398                         # In general, the absence of a last modified header should be enough to prevent
1399                         # the client from using its cache. We send a few other things just to make sure.
1400                         $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1401                         $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
1402                         $response->header( 'Pragma: no-cache' );
1403                 }
1404         }
1405
1406         /**
1407          * Get the message associed with the HTTP response code $code
1408          *
1409          * @param $code Integer: status code
1410          * @return String or null: message or null if $code is not in the list of
1411          *         messages
1412          */
1413         public static function getStatusMessage( $code ) {
1414                 static $statusMessage = array(
1415                         100 => 'Continue',
1416                         101 => 'Switching Protocols',
1417                         102 => 'Processing',
1418                         200 => 'OK',
1419                         201 => 'Created',
1420                         202 => 'Accepted',
1421                         203 => 'Non-Authoritative Information',
1422                         204 => 'No Content',
1423                         205 => 'Reset Content',
1424                         206 => 'Partial Content',
1425                         207 => 'Multi-Status',
1426                         300 => 'Multiple Choices',
1427                         301 => 'Moved Permanently',
1428                         302 => 'Found',
1429                         303 => 'See Other',
1430                         304 => 'Not Modified',
1431                         305 => 'Use Proxy',
1432                         307 => 'Temporary Redirect',
1433                         400 => 'Bad Request',
1434                         401 => 'Unauthorized',
1435                         402 => 'Payment Required',
1436                         403 => 'Forbidden',
1437                         404 => 'Not Found',
1438                         405 => 'Method Not Allowed',
1439                         406 => 'Not Acceptable',
1440                         407 => 'Proxy Authentication Required',
1441                         408 => 'Request Timeout',
1442                         409 => 'Conflict',
1443                         410 => 'Gone',
1444                         411 => 'Length Required',
1445                         412 => 'Precondition Failed',
1446                         413 => 'Request Entity Too Large',
1447                         414 => 'Request-URI Too Large',
1448                         415 => 'Unsupported Media Type',
1449                         416 => 'Request Range Not Satisfiable',
1450                         417 => 'Expectation Failed',
1451                         422 => 'Unprocessable Entity',
1452                         423 => 'Locked',
1453                         424 => 'Failed Dependency',
1454                         500 => 'Internal Server Error',
1455                         501 => 'Not Implemented',
1456                         502 => 'Bad Gateway',
1457                         503 => 'Service Unavailable',
1458                         504 => 'Gateway Timeout',
1459                         505 => 'HTTP Version Not Supported',
1460                         507 => 'Insufficient Storage'
1461                 );
1462                 return isset( $statusMessage[$code] ) ? $statusMessage[$code] : null;
1463         }
1464
1465         /**
1466          * Finally, all the text has been munged and accumulated into
1467          * the object, let's actually output it:
1468          */
1469         public function output() {
1470                 global $wgUser, $wgOutputEncoding, $wgRequest;
1471                 global $wgContLanguageCode, $wgDebugRedirects, $wgMimeType;
1472                 global $wgUseAjax, $wgAjaxWatch;
1473                 global $wgEnableMWSuggest, $wgUniversalEditButton;
1474                 global $wgArticle;
1475
1476                 if( $this->mDoNothing ){
1477                         return;
1478                 }
1479                 wfProfileIn( __METHOD__ );
1480                 if ( $this->mRedirect != '' ) {
1481                         # Standards require redirect URLs to be absolute
1482                         $this->mRedirect = wfExpandUrl( $this->mRedirect );
1483                         if( $this->mRedirectCode == '301' || $this->mRedirectCode == '303' ) {
1484                                 if( !$wgDebugRedirects ) {
1485                                         $message = self::getStatusMessage( $this->mRedirectCode );
1486                                         $wgRequest->response()->header( "HTTP/1.1 {$this->mRedirectCode} $message" );
1487                                 }
1488                                 $this->mLastModified = wfTimestamp( TS_RFC2822 );
1489                         }
1490                         $this->sendCacheControl();
1491
1492                         $wgRequest->response()->header( "Content-Type: text/html; charset=utf-8" );
1493                         if( $wgDebugRedirects ) {
1494                                 $url = htmlspecialchars( $this->mRedirect );
1495                                 print "<html>\n<head>\n<title>Redirect</title>\n</head>\n<body>\n";
1496                                 print "<p>Location: <a href=\"$url\">$url</a></p>\n";
1497                                 print "</body>\n</html>\n";
1498                         } else {
1499                                 $wgRequest->response()->header( 'Location: ' . $this->mRedirect );
1500                         }
1501                         wfProfileOut( __METHOD__ );
1502                         return;
1503                 } elseif ( $this->mStatusCode ) {
1504                         $message = self::getStatusMessage( $this->mStatusCode );
1505                         if ( $message )
1506                                 $wgRequest->response()->header( 'HTTP/1.1 ' . $this->mStatusCode . ' ' . $message );
1507                 }
1508
1509                 $sk = $wgUser->getSkin();
1510
1511                 if ( $wgUseAjax ) {
1512                         $this->addScriptFile( 'ajax.js' );
1513
1514                         wfRunHooks( 'AjaxAddScript', array( &$this ) );
1515
1516                         if( $wgAjaxWatch && $wgUser->isLoggedIn() ) {
1517                                 $this->addScriptFile( 'ajaxwatch.js' );
1518                         }
1519
1520                         if ( $wgEnableMWSuggest && !$wgUser->getOption( 'disablesuggest', false ) ){
1521                                 $this->addScriptFile( 'mwsuggest.js' );
1522                         }
1523                 }
1524
1525                 if( $wgUser->getBoolOption( 'editsectiononrightclick' ) ) {
1526                         $this->addScriptFile( 'rightclickedit.js' );
1527                 }
1528
1529                 if( $wgUniversalEditButton ) {
1530                         if( isset( $wgArticle ) && $this->getTitle() && $this->getTitle()->quickUserCan( 'edit' )
1531                                 && ( $this->getTitle()->exists() || $this->getTitle()->quickUserCan( 'create' ) ) ) {
1532                                 // Original UniversalEditButton
1533                                 $msg = wfMsg('edit');
1534                                 $this->addLink( array(
1535                                         'rel' => 'alternate',
1536                                         'type' => 'application/x-wiki',
1537                                         'title' => $msg,
1538                                         'href' => $this->getTitle()->getLocalURL( 'action=edit' )
1539                                 ) );
1540                                 // Alternate edit link
1541                                 $this->addLink( array(
1542                                         'rel' => 'edit',
1543                                         'title' => $msg,
1544                                         'href' => $this->getTitle()->getLocalURL( 'action=edit' )
1545                                 ) );
1546                         }
1547                 }
1548
1549                 # Buffer output; final headers may depend on later processing
1550                 ob_start();
1551
1552                 $wgRequest->response()->header( "Content-type: $wgMimeType; charset={$wgOutputEncoding}" );
1553                 $wgRequest->response()->header( 'Content-language: '.$wgContLanguageCode );
1554
1555                 if ($this->mArticleBodyOnly) {
1556                         $this->out($this->mBodytext);
1557                 } else {
1558                         // Hook that allows last minute changes to the output page, e.g.
1559                         // adding of CSS or Javascript by extensions.
1560                         wfRunHooks( 'BeforePageDisplay', array( &$this, &$sk ) );
1561
1562                         wfProfileIn( 'Output-skin' );
1563                         $sk->outputPage( $this );
1564                         wfProfileOut( 'Output-skin' );
1565                 }
1566
1567                 $this->sendCacheControl();
1568                 ob_end_flush();
1569                 wfProfileOut( __METHOD__ );
1570         }
1571
1572         /**
1573          * Actually output something with print(). Performs an iconv to the
1574          * output encoding, if needed.
1575          *
1576          * @param $ins String: the string to output
1577          */
1578         public function out( $ins ) {
1579                 global $wgInputEncoding, $wgOutputEncoding, $wgContLang;
1580                 if ( 0 == strcmp( $wgInputEncoding, $wgOutputEncoding ) ) {
1581                         $outs = $ins;
1582                 } else {
1583                         $outs = $wgContLang->iconv( $wgInputEncoding, $wgOutputEncoding, $ins );
1584                         if ( false === $outs ) { $outs = $ins; }
1585                 }
1586                 print $outs;
1587         }
1588
1589         /**
1590          * @todo document
1591          */
1592         public static function setEncodings() {
1593                 global $wgInputEncoding, $wgOutputEncoding;
1594                 global $wgContLang;
1595
1596                 $wgInputEncoding = strtolower( $wgInputEncoding );
1597
1598                 if ( empty( $_SERVER['HTTP_ACCEPT_CHARSET'] ) ) {
1599                         $wgOutputEncoding = strtolower( $wgOutputEncoding );
1600                         return;
1601                 }
1602                 $wgOutputEncoding = $wgInputEncoding;
1603         }
1604
1605         /**
1606          * @deprecated use wfReportTime() instead.
1607          *
1608          * @return String
1609          */
1610         public function reportTime() {
1611                 wfDeprecated( __METHOD__ );
1612                 $time = wfReportTime();
1613                 return $time;
1614         }
1615
1616         /**
1617          * Produce a "user is blocked" page.
1618          *
1619          * @param $return Boolean: whether to have a "return to $wgTitle" message or not.
1620          * @return nothing
1621          */
1622         function blockedPage( $return = true ) {
1623                 global $wgUser, $wgContLang, $wgLang;
1624
1625                 $this->setPageTitle( wfMsg( 'blockedtitle' ) );
1626                 $this->setRobotPolicy( 'noindex,nofollow' );
1627                 $this->setArticleRelated( false );
1628
1629                 $name = User::whoIs( $wgUser->blockedBy() );
1630                 $reason = $wgUser->blockedFor();
1631                 if( $reason == '' ) {
1632                         $reason = wfMsg( 'blockednoreason' );
1633                 }
1634                 $blockTimestamp = $wgLang->timeanddate( wfTimestamp( TS_MW, $wgUser->mBlock->mTimestamp ), true );
1635                 $ip = wfGetIP();
1636
1637                 $link = '[[' . $wgContLang->getNsText( NS_USER ) . ":{$name}|{$name}]]";
1638
1639                 $blockid = $wgUser->mBlock->mId;
1640
1641                 $blockExpiry = $wgUser->mBlock->mExpiry;
1642                 if ( $blockExpiry == 'infinity' ) {
1643                         // Entry in database (table ipblocks) is 'infinity' but 'ipboptions' uses 'infinite' or 'indefinite'
1644                         // Search for localization in 'ipboptions'
1645                         $scBlockExpiryOptions = wfMsg( 'ipboptions' );
1646                         foreach ( explode( ',', $scBlockExpiryOptions ) as $option ) {
1647                                 if ( strpos( $option, ":" ) === false )
1648                                         continue;
1649                                 list( $show, $value ) = explode( ":", $option );
1650                                 if ( $value == 'infinite' || $value == 'indefinite' ) {
1651                                         $blockExpiry = $show;
1652                                         break;
1653                                 }
1654                         }
1655                 } else {
1656                         $blockExpiry = $wgLang->timeanddate( wfTimestamp( TS_MW, $blockExpiry ), true );
1657                 }
1658
1659                 if ( $wgUser->mBlock->mAuto ) {
1660                         $msg = 'autoblockedtext';
1661                 } else {
1662                         $msg = 'blockedtext';
1663                 }
1664
1665                 /* $ip returns who *is* being blocked, $intended contains who was meant to be blocked.
1666                  * This could be a username, an ip range, or a single ip. */
1667                 $intended = $wgUser->mBlock->mAddress;
1668
1669                 $this->addWikiMsg( $msg, $link, $reason, $ip, $name, $blockid, $blockExpiry, $intended, $blockTimestamp );
1670
1671                 # Don't auto-return to special pages
1672                 if( $return ) {
1673                         $return = $this->getTitle()->getNamespace() > -1 ? $this->getTitle() : null;
1674                         $this->returnToMain( null, $return );
1675                 }
1676         }
1677
1678         /**
1679          * Output a standard error page
1680          *
1681          * @param $title String: message key for page title
1682          * @param $msg String: message key for page text
1683          * @param $params Array: message parameters
1684          */
1685         public function showErrorPage( $title, $msg, $params = array() ) {
1686                 if ( $this->getTitle() ) {
1687                         $this->mDebugtext .= 'Original title: ' . $this->getTitle()->getPrefixedText() . "\n";
1688                 }
1689                 $this->setPageTitle( wfMsg( $title ) );
1690                 $this->setHTMLTitle( wfMsg( 'errorpagetitle' ) );
1691                 $this->setRobotPolicy( 'noindex,nofollow' );
1692                 $this->setArticleRelated( false );
1693                 $this->enableClientCache( false );
1694                 $this->mRedirect = '';
1695                 $this->mBodytext = '';
1696
1697                 array_unshift( $params, 'parse' );
1698                 array_unshift( $params, $msg );
1699                 $this->addHTML( call_user_func_array( 'wfMsgExt', $params ) );
1700
1701                 $this->returnToMain();
1702         }
1703
1704         /**
1705          * Output a standard permission error page
1706          *
1707          * @param $errors Array: error message keys
1708          * @param $action String: action that was denied or null if unknown
1709          */
1710         public function showPermissionsErrorPage( $errors, $action = null ) {
1711                 $this->mDebugtext .= 'Original title: ' .
1712                 $this->getTitle()->getPrefixedText() . "\n";
1713                 $this->setPageTitle( wfMsg( 'permissionserrors' ) );
1714                 $this->setHTMLTitle( wfMsg( 'permissionserrors' ) );
1715                 $this->setRobotPolicy( 'noindex,nofollow' );
1716                 $this->setArticleRelated( false );
1717                 $this->enableClientCache( false );
1718                 $this->mRedirect = '';
1719                 $this->mBodytext = '';
1720                 $this->addWikiText( $this->formatPermissionsErrorMessage( $errors, $action ) );
1721         }
1722
1723         /**
1724          * Display an error page indicating that a given version of MediaWiki is
1725          * required to use it
1726          *
1727          * @param $version Mixed: the version of MediaWiki needed to use the page
1728          */
1729         public function versionRequired( $version ) {
1730                 $this->setPageTitle( wfMsg( 'versionrequired', $version ) );
1731                 $this->setHTMLTitle( wfMsg( 'versionrequired', $version ) );
1732                 $this->setRobotPolicy( 'noindex,nofollow' );
1733                 $this->setArticleRelated( false );
1734                 $this->mBodytext = '';
1735
1736                 $this->addWikiMsg( 'versionrequiredtext', $version );
1737                 $this->returnToMain();
1738         }
1739
1740         /**
1741          * Display an error page noting that a given permission bit is required.
1742          *
1743          * @param $permission String: key required
1744          */
1745         public function permissionRequired( $permission ) {
1746                 global $wgLang;
1747
1748                 $this->setPageTitle( wfMsg( 'badaccess' ) );
1749                 $this->setHTMLTitle( wfMsg( 'errorpagetitle' ) );
1750                 $this->setRobotPolicy( 'noindex,nofollow' );
1751                 $this->setArticleRelated( false );
1752                 $this->mBodytext = '';
1753
1754                 $groups = array_map( array( 'User', 'makeGroupLinkWiki' ),
1755                         User::getGroupsWithPermission( $permission ) );
1756                 if( $groups ) {
1757                         $this->addWikiMsg( 'badaccess-groups',
1758                                 $wgLang->commaList( $groups ),
1759                                 count( $groups) );
1760                 } else {
1761                         $this->addWikiMsg( 'badaccess-group0' );
1762                 }
1763                 $this->returnToMain();
1764         }
1765
1766         /**
1767          * @deprecated use permissionRequired()
1768          */
1769         public function sysopRequired() {
1770                 throw new MWException( "Call to deprecated OutputPage::sysopRequired() method\n" );
1771         }
1772
1773         /**
1774          * @deprecated use permissionRequired()
1775          */
1776         public function developerRequired() {
1777                 throw new MWException( "Call to deprecated OutputPage::developerRequired() method\n" );
1778         }
1779
1780         /**
1781          * Produce the stock "please login to use the wiki" page
1782          */
1783         public function loginToUse() {
1784                 global $wgUser, $wgContLang;
1785
1786                 if( $wgUser->isLoggedIn() ) {
1787                         $this->permissionRequired( 'read' );
1788                         return;
1789                 }
1790
1791                 $skin = $wgUser->getSkin();
1792
1793                 $this->setPageTitle( wfMsg( 'loginreqtitle' ) );
1794                 $this->setHtmlTitle( wfMsg( 'errorpagetitle' ) );
1795                 $this->setRobotPolicy( 'noindex,nofollow' );
1796                 $this->setArticleFlag( false );
1797
1798                 $loginTitle = SpecialPage::getTitleFor( 'Userlogin' );
1799                 $loginLink = $skin->link(
1800                         $loginTitle,
1801                         wfMsgHtml( 'loginreqlink' ),
1802                         array(),
1803                         array( 'returnto' => $this->getTitle()->getPrefixedText() ),
1804                         array( 'known', 'noclasses' )
1805                 );
1806                 $this->addHTML( wfMsgWikiHtml( 'loginreqpagetext', $loginLink ) );
1807                 $this->addHTML( "\n<!--" . $this->getTitle()->getPrefixedUrl() . "-->" );
1808
1809                 # Don't return to the main page if the user can't read it
1810                 # otherwise we'll end up in a pointless loop
1811                 $mainPage = Title::newMainPage();
1812                 if( $mainPage->userCanRead() )
1813                         $this->returnToMain( null, $mainPage );
1814         }
1815
1816         /**
1817          * Format a list of error messages
1818          *
1819          * @param $errors An array of arrays returned by Title::getUserPermissionsErrors
1820          * @param $action String: action that was denied or null if unknown
1821          * @return String: the wikitext error-messages, formatted into a list.
1822          */
1823         public function formatPermissionsErrorMessage( $errors, $action = null ) {
1824                 if ($action == null) {
1825                         $text = wfMsgNoTrans( 'permissionserrorstext', count($errors)). "\n\n";
1826                 } else {
1827                         global $wgLang;
1828                         $action_desc = wfMsgNoTrans( "action-$action" );
1829                         $text = wfMsgNoTrans( 'permissionserrorstext-withaction', count($errors), $action_desc ) . "\n\n";
1830                 }
1831
1832                 if (count( $errors ) > 1) {
1833                         $text .= '<ul class="permissions-errors">' . "\n";
1834
1835                         foreach( $errors as $error )
1836                         {
1837                                 $text .= '<li>';
1838                                 $text .= call_user_func_array( 'wfMsgNoTrans', $error );
1839                                 $text .= "</li>\n";
1840                         }
1841                         $text .= '</ul>';
1842                 } else {
1843                         $text .= "<div class=\"permissions-errors\">\n" . call_user_func_array( 'wfMsgNoTrans', reset( $errors ) ) . "\n</div>";
1844                 }
1845
1846                 return $text;
1847         }
1848
1849         /**
1850          * Display a page stating that the Wiki is in read-only mode,
1851          * and optionally show the source of the page that the user
1852          * was trying to edit.  Should only be called (for this
1853          * purpose) after wfReadOnly() has returned true.
1854          *
1855          * For historical reasons, this function is _also_ used to
1856          * show the error message when a user tries to edit a page
1857          * they are not allowed to edit.  (Unless it's because they're
1858          * blocked, then we show blockedPage() instead.)  In this
1859          * case, the second parameter should be set to true and a list
1860          * of reasons supplied as the third parameter.
1861          *
1862          * @todo Needs to be split into multiple functions.
1863          *
1864          * @param $source    String: source code to show (or null).
1865          * @param $protected Boolean: is this a permissions error?
1866          * @param $reasons   Array: list of reasons for this error, as returned by Title::getUserPermissionsErrors().
1867          * @param $action    String: action that was denied or null if unknown
1868          */
1869         public function readOnlyPage( $source = null, $protected = false, $reasons = array(), $action = null ) {
1870                 global $wgUser;
1871                 $skin = $wgUser->getSkin();
1872
1873                 $this->setRobotPolicy( 'noindex,nofollow' );
1874                 $this->setArticleRelated( false );
1875
1876                 // If no reason is given, just supply a default "I can't let you do
1877                 // that, Dave" message.  Should only occur if called by legacy code.
1878                 if ( $protected && empty($reasons) ) {
1879                         $reasons[] = array( 'badaccess-group0' );
1880                 }
1881
1882                 if ( !empty($reasons) ) {
1883                         // Permissions error
1884                         if( $source ) {
1885                                 $this->setPageTitle( wfMsg( 'viewsource' ) );
1886                                 $this->setSubtitle(
1887                                         wfMsg(
1888                                                 'viewsourcefor',
1889                                                 $skin->link(
1890                                                         $this->getTitle(),
1891                                                         null,
1892                                                         array(),
1893                                                         array(),
1894                                                         array( 'known', 'noclasses' )
1895                                                 )
1896                                         )
1897                                 );
1898                         } else {
1899                                 $this->setPageTitle( wfMsg( 'badaccess' ) );
1900                         }
1901                         $this->addWikiText( $this->formatPermissionsErrorMessage( $reasons, $action ) );
1902                 } else {
1903                         // Wiki is read only
1904                         $this->setPageTitle( wfMsg( 'readonly' ) );
1905                         $reason = wfReadOnlyReason();
1906                         $this->wrapWikiMsg( '<div class="mw-readonly-error">\n$1</div>', array( 'readonlytext', $reason ) );
1907                 }
1908
1909                 // Show source, if supplied
1910                 if( is_string( $source ) ) {
1911                         $this->addWikiMsg( 'viewsourcetext' );
1912
1913                         $params = array(
1914                                 'id'   => 'wpTextbox1',
1915                                 'name' => 'wpTextbox1',
1916                                 'cols' => $wgUser->getOption( 'cols' ),
1917                                 'rows' => $wgUser->getOption( 'rows' ),
1918                                 'readonly' => 'readonly'
1919                         );
1920                         $this->addHTML( Html::element( 'textarea', $params, $source ) );
1921
1922                         // Show templates used by this article
1923                         $skin = $wgUser->getSkin();
1924                         $article = new Article( $this->getTitle() );
1925                         $this->addHTML( "<div class='templatesUsed'>
1926 {$skin->formatTemplates( $article->getUsedTemplates() )}
1927 </div>
1928 " );
1929                 }
1930
1931                 # If the title doesn't exist, it's fairly pointless to print a return
1932                 # link to it.  After all, you just tried editing it and couldn't, so
1933                 # what's there to do there?
1934                 if( $this->getTitle()->exists() ) {
1935                         $this->returnToMain( null, $this->getTitle() );
1936                 }
1937         }
1938
1939         /** @deprecated */
1940         public function errorpage( $title, $msg ) {
1941                 wfDeprecated( __METHOD__ );
1942                 throw new ErrorPageError( $title, $msg );
1943         }
1944
1945         /** @deprecated */
1946         public function databaseError( $fname, $sql, $error, $errno ) {
1947                 throw new MWException( "OutputPage::databaseError is obsolete\n" );
1948         }
1949
1950         /** @deprecated */
1951         public function fatalError( $message ) {
1952                 wfDeprecated( __METHOD__ );
1953                 throw new FatalError( $message );
1954         }
1955
1956         /** @deprecated */
1957         public function unexpectedValueError( $name, $val ) {
1958                 wfDeprecated( __METHOD__ );
1959                 throw new FatalError( wfMsg( 'unexpected', $name, $val ) );
1960         }
1961
1962         /** @deprecated */
1963         public function fileCopyError( $old, $new ) {
1964                 wfDeprecated( __METHOD__ );
1965                 throw new FatalError( wfMsg( 'filecopyerror', $old, $new ) );
1966         }
1967
1968         /** @deprecated */
1969         public function fileRenameError( $old, $new ) {
1970                 wfDeprecated( __METHOD__ );
1971                 throw new FatalError( wfMsg( 'filerenameerror', $old, $new ) );
1972         }
1973
1974         /** @deprecated */
1975         public function fileDeleteError( $name ) {
1976                 wfDeprecated( __METHOD__ );
1977                 throw new FatalError( wfMsg( 'filedeleteerror', $name ) );
1978         }
1979
1980         /** @deprecated */
1981         public function fileNotFoundError( $name ) {
1982                 wfDeprecated( __METHOD__ );
1983                 throw new FatalError( wfMsg( 'filenotfound', $name ) );
1984         }
1985
1986         public function showFatalError( $message ) {
1987                 $this->setPageTitle( wfMsg( "internalerror" ) );
1988                 $this->setRobotPolicy( "noindex,nofollow" );
1989                 $this->setArticleRelated( false );
1990                 $this->enableClientCache( false );
1991                 $this->mRedirect = '';
1992                 $this->mBodytext = $message;
1993         }
1994
1995         public function showUnexpectedValueError( $name, $val ) {
1996                 $this->showFatalError( wfMsg( 'unexpected', $name, $val ) );
1997         }
1998
1999         public function showFileCopyError( $old, $new ) {
2000                 $this->showFatalError( wfMsg( 'filecopyerror', $old, $new ) );
2001         }
2002
2003         public function showFileRenameError( $old, $new ) {
2004                 $this->showFatalError( wfMsg( 'filerenameerror', $old, $new ) );
2005         }
2006
2007         public function showFileDeleteError( $name ) {
2008                 $this->showFatalError( wfMsg( 'filedeleteerror', $name ) );
2009         }
2010
2011         public function showFileNotFoundError( $name ) {
2012                 $this->showFatalError( wfMsg( 'filenotfound', $name ) );
2013         }
2014
2015         /**
2016          * Add a "return to" link pointing to a specified title
2017          *
2018          * @param $title Title to link
2019          * @param $query String: query string
2020          */
2021         public function addReturnTo( $title, $query = array() ) {
2022                 global $wgUser;
2023                 $this->addLink( array( 'rel' => 'next', 'href' => $title->getFullUrl() ) );
2024                 $link = wfMsgHtml( 'returnto', $wgUser->getSkin()->link(
2025                         $title, null, array(), $query ) );
2026                 $this->addHTML( "<p id=\"mw-returnto\">{$link}</p>\n" );
2027         }
2028
2029         /**
2030          * Add a "return to" link pointing to a specified title,
2031          * or the title indicated in the request, or else the main page
2032          *
2033          * @param $unused No longer used
2034          * @param $returnto Title or String to return to
2035          * @param $returntoquery String: query string for the return to link
2036          */
2037         public function returnToMain( $unused = null, $returnto = null, $returntoquery = null ) {
2038                 global $wgRequest;
2039
2040                 if ( $returnto == null ) {
2041                         $returnto = $wgRequest->getText( 'returnto' );
2042                 }
2043
2044                 if ( $returntoquery == null ) {
2045                         $returntoquery = $wgRequest->getText( 'returntoquery' );
2046                 }
2047
2048                 if ( $returnto === '' ) {
2049                         $returnto = Title::newMainPage();
2050                 }
2051
2052                 if ( is_object( $returnto ) ) {
2053                         $titleObj = $returnto;
2054                 } else {
2055                         $titleObj = Title::newFromText( $returnto );
2056                 }
2057                 if ( !is_object( $titleObj ) ) {
2058                         $titleObj = Title::newMainPage();
2059                 }
2060
2061                 $this->addReturnTo( $titleObj, $returntoquery );
2062         }
2063
2064         /**
2065          * @param $sk Skin The given Skin
2066          * @param $includeStyle Unused (?)
2067          * @return String: The doctype, opening <html>, and head element.
2068          */
2069         public function headElement( Skin $sk, $includeStyle = true ) {
2070                 global $wgDocType, $wgDTD, $wgContLanguageCode, $wgOutputEncoding, $wgMimeType;
2071                 global $wgXhtmlDefaultNamespace, $wgXhtmlNamespaces, $wgHtml5Version;
2072                 global $wgContLang, $wgUseTrackbacks, $wgStyleVersion, $wgHtml5, $wgWellFormedXml;
2073                 global $wgUser, $wgRequest, $wgLang;
2074
2075                 $this->addMeta( "http:Content-Type", "$wgMimeType; charset={$wgOutputEncoding}" );
2076                 if ( $sk->commonPrintStylesheet() ) {
2077                         $this->addStyle( 'common/wikiprintable.css', 'print' );
2078                 }
2079                 $sk->setupUserCss( $this );
2080
2081                 $ret = '';
2082
2083                 if( $wgMimeType == 'text/xml' || $wgMimeType == 'application/xhtml+xml' || $wgMimeType == 'application/xml' ) {
2084                         $ret .= "<?xml version=\"1.0\" encoding=\"$wgOutputEncoding\" ?" . ">\n";
2085                 }
2086
2087                 if ( $this->getHTMLTitle() == '' ) {
2088                         $this->setHTMLTitle(  wfMsg( 'pagetitle', $this->getPageTitle() ));
2089                 }
2090
2091                 $dir = $wgContLang->getDir();
2092
2093                 if ( $wgHtml5 ) {
2094                         if ( $wgWellFormedXml ) {
2095                                 # Unknown elements and attributes are okay in XML, but unknown
2096                                 # named entities are well-formedness errors and will break XML
2097                                 # parsers.  Thus we need a doctype that gives us appropriate
2098                                 # entity definitions.  The HTML5 spec permits four legacy
2099                                 # doctypes as obsolete but conforming, so let's pick one of
2100                                 # those, although it makes our pages look like XHTML1 Strict.
2101                                 # Isn't compatibility great?
2102                                 $ret .= "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Strict//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd\">\n";
2103                         } else {
2104                                 # Much saner.
2105                                 $ret .= "<!doctype html>\n";
2106                         }
2107                         $ret .= "<html lang=\"$wgContLanguageCode\" dir=\"$dir\"";
2108                         if ( $wgHtml5Version ) $ret .= " version=\"$wgHtml5Version\"";
2109                         $ret .= ">\n";
2110                 } else {
2111                         $ret .= "<!DOCTYPE html PUBLIC \"$wgDocType\" \"$wgDTD\">\n";
2112                         $ret .= "<html xmlns=\"{$wgXhtmlDefaultNamespace}\" ";
2113                         foreach($wgXhtmlNamespaces as $tag => $ns) {
2114                                 $ret .= "xmlns:{$tag}=\"{$ns}\" ";
2115                         }
2116                         $ret .= "lang=\"$wgContLanguageCode\" dir=\"$dir\">\n";
2117                 }
2118
2119                 $ret .= "<head>\n";
2120                 $ret .= "<title>" . htmlspecialchars( $this->getHTMLTitle() ) . "</title>\n";
2121                 $ret .= implode( "\n", array(
2122                         $this->getHeadLinks(),
2123                         $this->buildCssLinks(),
2124                         $this->getHeadScripts( $sk ),
2125                         $this->getHeadItems(),
2126                 ));
2127                 if( $sk->usercss ){
2128                         $ret .= Html::inlineStyle( $sk->usercss );
2129                 }
2130
2131                 if ($wgUseTrackbacks && $this->isArticleRelated())
2132                         $ret .= $this->getTitle()->trackbackRDF();
2133
2134                 $ret .= "</head>\n";
2135
2136                 $bodyAttrs = array();
2137
2138                 # Crazy edit-on-double-click stuff
2139                 $action = $wgRequest->getVal( 'action', 'view' );
2140
2141                 if ( $this->getTitle()->getNamespace() != NS_SPECIAL
2142                 && !in_array( $action, array( 'edit', 'submit' ) )
2143                 && $wgUser->getOption( 'editondblclick' ) ) {
2144                         $bodyAttrs['ondblclick'] = "document.location = '" . Xml::escapeJsString( $this->getTitle()->getEditURL() ) . "'";
2145                 }
2146
2147                 # Class bloat
2148                 $bodyAttrs['class'] = "mediawiki $dir";
2149
2150                 if ( $wgLang->capitalizeAllNouns() ) {
2151                         # A <body> class is probably not the best way to do this . . .
2152                         $bodyAttrs['class'] .= ' capitalize-all-nouns';
2153                 }
2154                 $bodyAttrs['class'] .= ' ns-' . $this->getTitle()->getNamespace();
2155                 if ( $this->getTitle()->getNamespace() == NS_SPECIAL ) {
2156                         $bodyAttrs['class'] .= ' ns-special';
2157                 } elseif ( $this->getTitle()->isTalkPage() ) {
2158                         $bodyAttrs['class'] .= ' ns-talk';
2159                 } else {
2160                         $bodyAttrs['class'] .= ' ns-subject';
2161                 }
2162                 $bodyAttrs['class'] .= ' ' . Sanitizer::escapeClass( 'page-' . $this->getTitle()->getPrefixedText() );
2163                 $bodyAttrs['class'] .= ' skin-' . Sanitizer::escapeClass( $wgUser->getSkin()->getSkinName() );
2164
2165                 $ret .= Html::openElement( 'body', $bodyAttrs ) . "\n";
2166
2167                 return $ret;
2168         }
2169
2170         /**
2171          * Gets the global variables and mScripts; also adds userjs to the end if
2172          * enabled
2173          *
2174          * @param $sk Skin object to use
2175          * @return String: HTML fragment
2176          */
2177         function getHeadScripts( Skin $sk ) {
2178                 global $wgUser, $wgRequest, $wgJsMimeType, $wgUseSiteJs;
2179                 global $wgStylePath, $wgStyleVersion;
2180
2181                 $scripts = Skin::makeGlobalVariablesScript( $sk->getSkinName() );
2182                 $scripts .= Html::linkedScript( "{$wgStylePath}/common/wikibits.js?$wgStyleVersion" );
2183
2184                 //add site JS if enabled:
2185                 if( $wgUseSiteJs ) {
2186                         $jsCache = $wgUser->isLoggedIn() ? '&smaxage=0' : '';
2187                         $this->addScriptFile(  Skin::makeUrl( '-',
2188                                         "action=raw$jsCache&gen=js&useskin=" .
2189                                         urlencode( $sk->getSkinName() )
2190                                         )
2191                                 );
2192                 }
2193
2194                 //add user js if enabled:
2195                 if( $this->isUserJsAllowed() && $wgUser->isLoggedIn() ) {
2196                         $action = $wgRequest->getVal( 'action', 'view' );
2197                         if( $this->mTitle && $this->mTitle->isJsSubpage() and $sk->userCanPreview( $action ) ) {
2198                                 # XXX: additional security check/prompt?
2199                                 $this->addInlineScript( $wgRequest->getText( 'wpTextbox1' ) );
2200                         } else {
2201                                 $userpage = $wgUser->getUserPage();
2202                                 $scriptpage = Title::makeTitleSafe(
2203                                         NS_USER,
2204                                         $userpage->getDBkey() . '/' . $sk->getSkinName() . '.js'
2205                                 );
2206                                 if ( $scriptpage && $scriptpage->exists() ) {
2207                                         $userjs = Skin::makeUrl( $scriptpage->getPrefixedText(), 'action=raw&ctype=' . $wgJsMimeType );
2208                                         $this->addScriptFile( $userjs );
2209                                 }
2210                         }
2211                 }
2212
2213                 $scripts .= "\n" . $this->mScripts;
2214                 return $scripts;
2215         }
2216
2217         /**
2218          * Add default \<meta\> tags
2219          */
2220         protected function addDefaultMeta() {
2221                 global $wgVersion, $wgHtml5;
2222
2223                 static $called = false;
2224                 if ( $called ) {
2225                         # Don't run this twice
2226                         return;
2227                 }
2228                 $called = true;
2229
2230                 if ( !$wgHtml5 ) {
2231                         $this->addMeta( 'http:Content-Style-Type', 'text/css' ); //bug 15835
2232                 }
2233                 $this->addMeta( 'generator', "MediaWiki $wgVersion" );
2234
2235                 $p = "{$this->mIndexPolicy},{$this->mFollowPolicy}";
2236                 if( $p !== 'index,follow' ) {
2237                         // http://www.robotstxt.org/wc/meta-user.html
2238                         // Only show if it's different from the default robots policy
2239                         $this->addMeta( 'robots', $p );
2240                 }
2241
2242                 if ( count( $this->mKeywords ) > 0 ) {
2243                         $strip = array(
2244                                 "/<.*?" . ">/" => '',
2245                                 "/_/" => ' '
2246                         );
2247                         $this->addMeta( 'keywords', preg_replace(array_keys($strip), array_values($strip),implode( ",", $this->mKeywords ) ) );
2248                 }
2249         }
2250
2251         /**
2252          * @return string HTML tag links to be put in the header.
2253          */
2254         public function getHeadLinks() {
2255                 global $wgRequest, $wgFeed;
2256
2257                 // Ideally this should happen earlier, somewhere. :P
2258                 $this->addDefaultMeta();
2259
2260                 $tags = array();
2261
2262                 foreach ( $this->mMetatags as $tag ) {
2263                         if ( 0 == strcasecmp( 'http:', substr( $tag[0], 0, 5 ) ) ) {
2264                                 $a = 'http-equiv';
2265                                 $tag[0] = substr( $tag[0], 5 );
2266                         } else {
2267                                 $a = 'name';
2268                         }
2269                         $tags[] = Html::element( 'meta',
2270                                 array(
2271                                         $a => $tag[0],
2272                                         'content' => $tag[1] ) );
2273                 }
2274                 foreach ( $this->mLinktags as $tag ) {
2275                         $tags[] = Html::element( 'link', $tag );
2276                 }
2277
2278                 if( $wgFeed ) {
2279                         foreach( $this->getSyndicationLinks() as $format => $link ) {
2280                                 # Use the page name for the title (accessed through $wgTitle since
2281                                 # there's no other way).  In principle, this could lead to issues
2282                                 # with having the same name for different feeds corresponding to
2283                                 # the same page, but we can't avoid that at this low a level.
2284
2285                                 $tags[] = $this->feedLink(
2286                                         $format,
2287                                         $link,
2288                                         # Used messages: 'page-rss-feed' and 'page-atom-feed' (for an easier grep)
2289                                         wfMsg( "page-{$format}-feed", $this->getTitle()->getPrefixedText() ) );
2290                         }
2291
2292                         # Recent changes feed should appear on every page (except recentchanges,
2293                         # that would be redundant). Put it after the per-page feed to avoid
2294                         # changing existing behavior. It's still available, probably via a
2295                         # menu in your browser. Some sites might have a different feed they'd
2296                         # like to promote instead of the RC feed (maybe like a "Recent New Articles"
2297                         # or "Breaking news" one). For this, we see if $wgOverrideSiteFeed is defined.
2298                         # If so, use it instead.
2299
2300                         global $wgOverrideSiteFeed, $wgSitename, $wgAdvertisedFeedTypes;
2301                         $rctitle = SpecialPage::getTitleFor( 'Recentchanges' );
2302
2303                         if ( $wgOverrideSiteFeed ) {
2304                                 foreach ( $wgOverrideSiteFeed as $type => $feedUrl ) {
2305                                         $tags[] = $this->feedLink (
2306                                                 $type,
2307                                                 htmlspecialchars( $feedUrl ),
2308                                                 wfMsg( "site-{$type}-feed", $wgSitename ) );
2309                                 }
2310                         } elseif ( $this->getTitle()->getPrefixedText() != $rctitle->getPrefixedText() ) {
2311                                 foreach ( $wgAdvertisedFeedTypes as $format ) {
2312                                         $tags[] = $this->feedLink(
2313                                                 $format,
2314                                                 $rctitle->getLocalURL( "feed={$format}" ),
2315                                                 wfMsg( "site-{$format}-feed", $wgSitename ) ); # For grep: 'site-rss-feed', 'site-atom-feed'.
2316                                 }
2317                         }
2318                 }
2319
2320                 return implode( "\n", $tags );
2321         }
2322
2323         /**
2324          * Generate a <link rel/> for a feed.
2325          *
2326          * @param $type String: feed type
2327          * @param $url String: URL to the feed
2328          * @param $text String: value of the "title" attribute
2329          * @return String: HTML fragment
2330          */
2331         private function feedLink( $type, $url, $text ) {
2332                 return Html::element( 'link', array(
2333                         'rel' => 'alternate',
2334                         'type' => "application/$type+xml",
2335                         'title' => $text,
2336                         'href' => $url ) );
2337         }
2338
2339         /**
2340          * Add a local or specified stylesheet, with the given media options.
2341          * Meant primarily for internal use...
2342          *
2343          * @param $style String: URL to the file
2344          * @param $media String: to specify a media type, 'screen', 'printable', 'handheld' or any.
2345          * @param $condition String: for IE conditional comments, specifying an IE version
2346          * @param $dir String: set to 'rtl' or 'ltr' for direction-specific sheets
2347          */
2348         public function addStyle( $style, $media='', $condition='', $dir='' ) {
2349                 $options = array();
2350                 // Even though we expect the media type to be lowercase, but here we
2351                 // force it to lowercase to be safe.
2352                 if( $media )
2353                         $options['media'] = $media;
2354                 if( $condition )
2355                         $options['condition'] = $condition;
2356                 if( $dir )
2357                         $options['dir'] = $dir;
2358                 $this->styles[$style] = $options;
2359         }
2360
2361         /**
2362          * Adds inline CSS styles
2363          * @param $style_css Mixed: inline CSS
2364          */
2365         public function addInlineStyle( $style_css ){
2366                 $this->mScripts .= Html::inlineStyle( $style_css );
2367         }
2368
2369         /**
2370          * Build a set of <link>s for the stylesheets specified in the $this->styles array.
2371          * These will be applied to various media & IE conditionals.
2372          */
2373         public function buildCssLinks() {
2374                 $links = array();
2375                 foreach( $this->styles as $file => $options ) {
2376                         $link = $this->styleLink( $file, $options );
2377                         if( $link )
2378                                 $links[] = $link;
2379                 }
2380
2381                 return implode( "\n", $links );
2382         }
2383
2384         /**
2385          * Generate \<link\> tags for stylesheets
2386          *
2387          * @param $style String: URL to the file
2388          * @param $options Array: option, can contain 'condition', 'dir', 'media'
2389          *                 keys
2390          * @return String: HTML fragment
2391          */
2392         protected function styleLink( $style, $options ) {
2393                 global $wgRequest;
2394
2395                 if( isset( $options['dir'] ) ) {
2396                         global $wgContLang;
2397                         $siteDir = $wgContLang->getDir();
2398                         if( $siteDir != $options['dir'] )
2399                                 return '';
2400                 }
2401
2402                 if( isset( $options['media'] ) ) {
2403                         $media = $this->transformCssMedia( $options['media'] );
2404                         if( is_null( $media ) ) {
2405                                 return '';
2406                         }
2407                 } else {
2408                         $media = 'all';
2409                 }
2410
2411                 if( substr( $style, 0, 1 ) == '/' ||
2412                         substr( $style, 0, 5 ) == 'http:' ||
2413                         substr( $style, 0, 6 ) == 'https:' ) {
2414                         $url = $style;
2415                 } else {
2416                         global $wgStylePath, $wgStyleVersion;
2417                         $url = $wgStylePath . '/' . $style . '?' . $wgStyleVersion;
2418                 }
2419
2420                 $link = Html::linkedStyle( $url, $media );
2421
2422                 if( isset( $options['condition'] ) ) {
2423                         $condition = htmlspecialchars( $options['condition'] );
2424                         $link = "<!--[if $condition]>$link<![endif]-->";
2425                 }
2426                 return $link;
2427         }
2428
2429         /**
2430          * Transform "media" attribute based on request parameters
2431          *
2432          * @param $media String: current value of the "media" attribute
2433          * @return String: modified value of the "media" attribute
2434          */
2435         function transformCssMedia( $media ) {
2436                 global $wgRequest, $wgHandheldForIPhone;
2437
2438                 // Switch in on-screen display for media testing
2439                 $switches = array(
2440                         'printable' => 'print',
2441                         'handheld' => 'handheld',
2442                 );
2443                 foreach( $switches as $switch => $targetMedia ) {
2444                         if( $wgRequest->getBool( $switch ) ) {
2445                                 if( $media == $targetMedia ) {
2446                                         $media = '';
2447                                 } elseif( $media == 'screen' ) {
2448                                         return null;
2449                                 }
2450                         }
2451                 }
2452
2453                 // Expand longer media queries as iPhone doesn't grok 'handheld'
2454                 if( $wgHandheldForIPhone ) {
2455                         $mediaAliases = array(
2456                                 'screen' => 'screen and (min-device-width: 481px)',
2457                                 'handheld' => 'handheld, only screen and (max-device-width: 480px)',
2458                         );
2459
2460                         if( isset( $mediaAliases[$media] ) ) {
2461                                 $media = $mediaAliases[$media];
2462                         }
2463                 }
2464
2465                 return $media;
2466         }
2467
2468         /**
2469          * Turn off regular page output and return an error reponse
2470          * for when rate limiting has triggered.
2471          */
2472         public function rateLimited() {
2473                 $this->setPageTitle(wfMsg('actionthrottled'));
2474                 $this->setRobotPolicy( 'noindex,follow' );
2475                 $this->setArticleRelated( false );
2476                 $this->enableClientCache( false );
2477                 $this->mRedirect = '';
2478                 $this->clearHTML();
2479                 $this->setStatusCode(503);
2480                 $this->addWikiMsg( 'actionthrottledtext' );
2481
2482                 $this->returnToMain( null, $this->getTitle() );
2483         }
2484
2485         /**
2486          * Show a warning about slave lag
2487          *
2488          * If the lag is higher than $wgSlaveLagCritical seconds,
2489          * then the warning is a bit more obvious. If the lag is
2490          * lower than $wgSlaveLagWarning, then no warning is shown.
2491          *
2492          * @param $lag Integer: slave lag
2493          */
2494         public function showLagWarning( $lag ) {
2495                 global $wgSlaveLagWarning, $wgSlaveLagCritical, $wgLang;
2496                 if( $lag >= $wgSlaveLagWarning ) {
2497                         $message = $lag < $wgSlaveLagCritical
2498                                 ? 'lag-warn-normal'
2499                                 : 'lag-warn-high';
2500                         $wrap = Html::rawElement( 'div', array( 'class' => "mw-{$message}" ), "\n$1\n" );
2501                         $this->wrapWikiMsg( "$wrap\n", array( $message, $wgLang->formatNum( $lag ) ) );
2502                 }
2503         }
2504
2505         /**
2506          * Add a wikitext-formatted message to the output.
2507          * This is equivalent to:
2508          *
2509          *    $wgOut->addWikiText( wfMsgNoTrans( ... ) )
2510          */
2511         public function addWikiMsg( /*...*/ ) {
2512                 $args = func_get_args();
2513                 $name = array_shift( $args );
2514                 $this->addWikiMsgArray( $name, $args );
2515         }
2516
2517         /**
2518          * Add a wikitext-formatted message to the output.
2519          * Like addWikiMsg() except the parameters are taken as an array
2520          * instead of a variable argument list.
2521          *
2522          * $options is passed through to wfMsgExt(), see that function for details.
2523          */
2524         public function addWikiMsgArray( $name, $args, $options = array() ) {
2525                 $options[] = 'parse';
2526                 $text = wfMsgExt( $name, $options, $args );
2527                 $this->addHTML( $text );
2528         }
2529
2530         /**
2531          * This function takes a number of message/argument specifications, wraps them in
2532          * some overall structure, and then parses the result and adds it to the output.
2533          *
2534          * In the $wrap, $1 is replaced with the first message, $2 with the second, and so
2535          * on. The subsequent arguments may either be strings, in which case they are the
2536          * message names, or arrays, in which case the first element is the message name,
2537          * and subsequent elements are the parameters to that message.
2538          *
2539          * The special named parameter 'options' in a message specification array is passed
2540          * through to the $options parameter of wfMsgExt().
2541          *
2542          * Don't use this for messages that are not in users interface language.
2543          *
2544          * For example:
2545          *
2546          *    $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>", 'some-error' );
2547          *
2548          * Is equivalent to:
2549          *
2550          *    $wgOut->addWikiText( "<div class='error'>\n" . wfMsgNoTrans( 'some-error' ) . "</div>" );
2551          *
2552          * The newline after opening div is needed in some wikitext. See bug 19226.
2553          */
2554         public function wrapWikiMsg( $wrap /*, ...*/ ) {
2555                 $msgSpecs = func_get_args();
2556                 array_shift( $msgSpecs );
2557                 $msgSpecs = array_values( $msgSpecs );
2558                 $s = $wrap;
2559                 foreach ( $msgSpecs as $n => $spec ) {
2560                         $options = array();
2561                         if ( is_array( $spec ) ) {
2562                                 $args = $spec;
2563                                 $name = array_shift( $args );
2564                                 if ( isset( $args['options'] ) ) {
2565                                         $options = $args['options'];
2566                                         unset( $args['options'] );
2567                                 }
2568                         }  else {
2569                                 $args = array();
2570                                 $name = $spec;
2571                         }
2572                         $s = str_replace( '$' . ( $n + 1 ), wfMsgExt( $name, $options, $args ), $s );
2573                 }
2574                 $this->addHTML( $this->parse( $s, /*linestart*/true, /*uilang*/true ) );
2575         }
2576
2577         /**
2578          * Include jQuery core. Use this to avoid loading it multiple times
2579          * before we get a usable script loader.
2580          *
2581          * @param $modules Array: list of jQuery modules which should be loaded
2582          * @return Array: the list of modules which were not loaded.
2583          */
2584         public function includeJQuery( $modules = array() ) {
2585                 global $wgStylePath, $wgStyleVersion, $wgJsMimeType;
2586
2587                 $supportedModules = array( /** TODO: add things here */ );
2588                 $unsupported = array_diff( $modules, $supportedModules );
2589
2590                 $params = array(
2591                         'type' => $wgJsMimeType,
2592                         'src' => "$wgStylePath/common/jquery.min.js?$wgStyleVersion",
2593                 );
2594                 if ( !$this->mJQueryDone ) {
2595                         $this->mJQueryDone = true;
2596                         $this->mScripts = Html::element( 'script', $params ) . "\n" . $this->mScripts;
2597                 }
2598                 return $unsupported;
2599         }
2600
2601 }