includes/OutputPage.php

   1 <?php
   2 if ( !defined( 'MEDIAWIKI' ) ) {
   3         die( 1 );
   4 }
   5
   6 /**
   7  * This class should be covered by a general architecture document which does
   8  * not exist as of January 2011.  This is one of the Core classes and should
   9  * be read at least once by any new developers.
  10  *
  11  * This class is used to prepare the final rendering. A skin is then
  12  * applied to the output parameters (links, javascript, html, categories ...).
  13  *
  14  * @todo FIXME: Another class handles sending the whole page to the client.
  15  *
  16  * Some comments comes from a pairing session between Zak Greant and Antoine Musso
  17  * in November 2010.
  18  *
  19  * @todo document
  20  */
  21 class OutputPage extends ContextSource {
  22         /// Should be private. Used with addMeta() which adds <meta>
  23         var $mMetatags = array();
  24
  25         /// <meta keyworkds="stuff"> most of the time the first 10 links to an article
  26         var $mKeywords = array();
  27
  28         var $mLinktags = array();
  29
  30         /// Additional stylesheets. Looks like this is for extensions. Might be replaced by resource loader.
  31         var $mExtStyles = array();
  32
  33         /// Should be private - has getter and setter. Contains the HTML title
  34         var $mPagetitle = '';
  35
  36         /// Contains all of the <body> content. Should be private we got set/get accessors and the append() method.
  37         var $mBodytext = '';
  38
  39         /**
  40          * Holds the debug lines that will be output as comments in page source if
  41          * $wgDebugComments is enabled. See also $wgShowDebug.
  42          * TODO: make a getter method for this
  43          */
  44         public $mDebugtext = ''; // TODO: we might want to replace it by wfDebug() wfDebugLog()
  45
  46         /// Should be private. Stores contents of <title> tag
  47         var $mHTMLtitle = '';
  48
  49         /// Should be private. Is the displayed content related to the source of the corresponding wiki article.
  50         var $mIsarticle = false;
  51
  52         /**
  53          * Should be private. Has get/set methods properly documented.
  54          * Stores "article flag" toggle.
  55          */
  56         var $mIsArticleRelated = true;
  57
  58         /**
  59          * Should be private. We have to set isPrintable(). Some pages should
  60          * never be printed (ex: redirections).
  61          */
  62         var $mPrintable = false;
  63
  64         /**
  65          * Should be private. We have set/get/append methods.
  66          *
  67          * Contains the page subtitle. Special pages usually have some links here.
  68          * Don't confuse with site subtitle added by skins.
  69          */
  70         private $mSubtitle = array();
  71
  72         var $mRedirect = '';
  73         var $mStatusCode;
  74
  75         /**
  76          * mLastModified and mEtag are used for sending cache control.
  77          * The whole caching system should probably be moved into its own class.
  78          */
  79         var $mLastModified = '';
  80
  81         /**
  82          * Should be private. No getter but used in sendCacheControl();
  83          * Contains an HTTP Entity Tags (see RFC 2616 section 3.13) which is used
  84          * as a unique identifier for the content. It is later used by the client
  85          * to compare its cached version with the server version. Client sends
  86          * headers If-Match and If-None-Match containing its locally cached ETAG value.
  87          *
  88          * To get more information, you will have to look at HTTP/1.1 protocol which
  89          * is properly described in RFC 2616 : http://tools.ietf.org/html/rfc2616
  90          */
  91         var $mETag = false;
  92
  93         var $mCategoryLinks = array();
  94         var $mCategories = array();
  95
  96         /// Should be private. Array of Interwiki Prefixed (non DB key) Titles (e.g. 'fr:Test page')
  97         var $mLanguageLinks = array();
  98
  99         /**
 100          * Should be private. Used for JavaScript (pre resource loader)
 101          * We should split js / css.
 102          * mScripts content is inserted as is in <head> by Skin. This might contains
 103          * either a link to a stylesheet or inline css.
 104          */
 105         var $mScripts = '';
 106
 107         /**
 108          * Inline CSS styles. Use addInlineStyle() sparsingly
 109          */
 110         var $mInlineStyles = '';
 111
 112         //
 113         var $mLinkColours;
 114
 115         /**
 116          * Used by skin template.
 117          * Example: $tpl->set( 'displaytitle', $out->mPageLinkTitle );
 118          */
 119         var $mPageLinkTitle = '';
 120
 121         /// Array of elements in <head>. Parser might add its own headers!
 122         var $mHeadItems = array();
 123
 124         // @todo FIXME: Next variables probably comes from the resource loader
 125         var $mModules = array(), $mModuleScripts = array(), $mModuleStyles = array(), $mModuleMessages = array();
 126         var $mResourceLoader;
 127         var $mJsConfigVars = array();
 128
 129         /** @todo FIXME: Is this still used ?*/
 130         var $mInlineMsg = array();
 131
 132         var $mTemplateIds = array();
 133         var $mImageTimeKeys = array();
 134
 135         var $mRedirectCode = '';
 136
 137         var $mFeedLinksAppendQuery = null;
 138
 139         # What level of 'untrustworthiness' is allowed in CSS/JS modules loaded on this page?
 140         # @see ResourceLoaderModule::$origin
 141         # ResourceLoaderModule::ORIGIN_ALL is assumed unless overridden;
 142         protected $mAllowedModules = array(
 143                 ResourceLoaderModule::TYPE_COMBINED => ResourceLoaderModule::ORIGIN_ALL,
 144         );
 145
 146         /**
 147          * @EasterEgg I just love the name for this self documenting variable.
 148          * @todo document
 149          */
 150         var $mDoNothing = false;
 151
 152         // Parser related.
 153         var $mContainsOldMagic = 0, $mContainsNewMagic = 0;
 154
 155         /**
 156          * lazy initialised, use parserOptions()
 157          * @var ParserOptions
 158          */
 159         protected $mParserOptions = null;
 160
 161         /**
 162          * Handles the atom / rss links.
 163          * We probably only support atom in 2011.
 164          * Looks like a private variable.
 165          * @see $wgAdvertisedFeedTypes
 166          */
 167         var $mFeedLinks = array();
 168
 169         // Gwicke work on squid caching? Roughly from 2003.
 170         var $mEnableClientCache = true;
 171
 172         /**
 173          * Flag if output should only contain the body of the article.
 174          * Should be private.
 175          */
 176         var $mArticleBodyOnly = false;
 177
 178         var $mNewSectionLink = false;
 179         var $mHideNewSectionLink = false;
 180
 181         /**
 182          * Comes from the parser. This was probably made to load CSS/JS only
 183          * if we had <gallery>. Used directly in CategoryPage.php
 184          * Looks like resource loader can replace this.
 185          */
 186         var $mNoGallery = false;
 187
 188         // should be private.
 189         var $mPageTitleActionText = '';
 190         var $mParseWarnings = array();
 191
 192         // Cache stuff. Looks like mEnableClientCache
 193         var $mSquidMaxage = 0;
 194
 195         // @todo document
 196         var $mPreventClickjacking = true;
 197
 198         /// should be private. To include the variable {{REVISIONID}}
 199         var $mRevisionId = null;
 200
 201         var $mFileVersion = null;
 202
 203         /**
 204          * An array of stylesheet filenames (relative from skins path), with options
 205          * for CSS media, IE conditions, and RTL/LTR direction.
 206          * For internal use; add settings in the skin via $this->addStyle()
 207          *
 208          * Style again! This seems like a code duplication since we already have
 209          * mStyles. This is what makes OpenSource amazing.
 210          */
 211         var $styles = array();
 212
 213         /**
 214          * Whether jQuery is already handled.
 215          */
 216         protected $mJQueryDone = false;
 217
 218         private $mIndexPolicy = 'index';
 219         private $mFollowPolicy = 'follow';
 220         private $mVaryHeader = array(
 221                 'Accept-Encoding' => array( 'list-contains=gzip' ),
 222                 'Cookie' => null
 223         );
 224
 225         /**
 226          * Constructor for OutputPage. This should not be called directly.
 227          * Instead a new RequestContext should be created and it will implicitly create
 228          * a OutputPage tied to that context.
 229          */
 230         function __construct( IContextSource $context = null ) {
 231                 if ( $context === null ) {
 232                         # Extensions should use `new RequestContext` instead of `new OutputPage` now.
 233                         wfDeprecated( __METHOD__ );
 234                 } else {
 235                         $this->setContext( $context );
 236                 }
 237         }
 238
 239         /**
 240          * Redirect to $url rather than displaying the normal page
 241          *
 242          * @param $url String: URL
 243          * @param $responsecode String: HTTP status code
 244          */
 245         public function redirect( $url, $responsecode = '302' ) {
 246                 # Strip newlines as a paranoia check for header injection in PHP<5.1.2
 247                 $this->mRedirect = str_replace( "\n", '', $url );
 248                 $this->mRedirectCode = $responsecode;
 249         }
 250
 251         /**
 252          * Get the URL to redirect to, or an empty string if not redirect URL set
 253          *
 254          * @return String
 255          */
 256         public function getRedirect() {
 257                 return $this->mRedirect;
 258         }
 259
 260         /**
 261          * Set the HTTP status code to send with the output.
 262          *
 263          * @param $statusCode Integer
 264          */
 265         public function setStatusCode( $statusCode ) {
 266                 $this->mStatusCode = $statusCode;
 267         }
 268
 269         /**
 270          * Add a new <meta> tag
 271          * To add an http-equiv meta tag, precede the name with "http:"
 272          *
 273          * @param $name String tag name
 274          * @param $val String tag value
 275          */
 276         function addMeta( $name, $val ) {
 277                 array_push( $this->mMetatags, array( $name, $val ) );
 278         }
 279
 280         /**
 281          * Add a keyword or a list of keywords in the page header
 282          *
 283          * @param $text String or array of strings
 284          */
 285         function addKeyword( $text ) {
 286                 if( is_array( $text ) ) {
 287                         $this->mKeywords = array_merge( $this->mKeywords, $text );
 288                 } else {
 289                         array_push( $this->mKeywords, $text );
 290                 }
 291         }
 292
 293         /**
 294          * Add a new \<link\> tag to the page header
 295          *
 296          * @param $linkarr Array: associative array of attributes.
 297          */
 298         function addLink( $linkarr ) {
 299                 array_push( $this->mLinktags, $linkarr );
 300         }
 301
 302         /**
 303          * Add a new \<link\> with "rel" attribute set to "meta"
 304          *
 305          * @param $linkarr Array: associative array mapping attribute names to their
 306          *                 values, both keys and values will be escaped, and the
 307          *                 "rel" attribute will be automatically added
 308          */
 309         function addMetadataLink( $linkarr ) {
 310                 $linkarr['rel'] = $this->getMetadataAttribute();
 311                 $this->addLink( $linkarr );
 312         }
 313
 314         /**
 315          * Get the value of the "rel" attribute for metadata links
 316          *
 317          * @return String
 318          */
 319         public function getMetadataAttribute() {
 320                 # note: buggy CC software only reads first "meta" link
 321                 static $haveMeta = false;
 322                 if ( $haveMeta ) {
 323                         return 'alternate meta';
 324                 } else {
 325                         $haveMeta = true;
 326                         return 'meta';
 327                 }
 328         }
 329
 330         /**
 331          * Add raw HTML to the list of scripts (including \<script\> tag, etc.)
 332          *
 333          * @param $script String: raw HTML
 334          */
 335         function addScript( $script ) {
 336                 $this->mScripts .= $script . "\n";
 337         }
 338
 339         /**
 340          * Register and add a stylesheet from an extension directory.
 341          *
 342          * @param $url String path to sheet.  Provide either a full url (beginning
 343          *             with 'http', etc) or a relative path from the document root
 344          *             (beginning with '/').  Otherwise it behaves identically to
 345          *             addStyle() and draws from the /skins folder.
 346          */
 347         public function addExtensionStyle( $url ) {
 348                 array_push( $this->mExtStyles, $url );
 349         }
 350
 351         /**
 352          * Get all styles added by extensions
 353          *
 354          * @return Array
 355          */
 356         function getExtStyle() {
 357                 return $this->mExtStyles;
 358         }
 359
 360         /**
 361          * Add a JavaScript file out of skins/common, or a given relative path.
 362          *
 363          * @param $file String: filename in skins/common or complete on-server path
 364          *              (/foo/bar.js)
 365          * @param $version String: style version of the file. Defaults to $wgStyleVersion
 366          */
 367         public function addScriptFile( $file, $version = null ) {
 368                 global $wgStylePath, $wgStyleVersion;
 369                 // See if $file parameter is an absolute URL or begins with a slash
 370                 if( substr( $file, 0, 1 ) == '/' || preg_match( '#^[a-z]*://#i', $file ) ) {
 371                         $path = $file;
 372                 } else {
 373                         $path = "{$wgStylePath}/common/{$file}";
 374                 }
 375                 if ( is_null( $version ) )
 376                         $version = $wgStyleVersion;
 377                 $this->addScript( Html::linkedScript( wfAppendQuery( $path, $version ) ) );
 378         }
 379
 380         /**
 381          * Add a self-contained script tag with the given contents
 382          *
 383          * @param $script String: JavaScript text, no <script> tags
 384          */
 385         public function addInlineScript( $script ) {
 386                 $this->mScripts .= Html::inlineScript( "\n$script\n" ) . "\n";
 387         }
 388
 389         /**
 390          * Get all registered JS and CSS tags for the header.
 391          *
 392          * @return String
 393          */
 394         function getScript() {
 395                 return $this->mScripts . $this->getHeadItems();
 396         }
 397
 398         /**
 399          * Filter an array of modules to remove insufficiently trustworthy members, and modules
 400          * which are no longer registered (eg a page is cached before an extension is disabled)
 401          * @param $modules Array
 402          * @param $position String if not null, only return modules with this position
 403          * @param $type string
 404          * @return Array
 405          */
 406         protected function filterModules( $modules, $position = null, $type = ResourceLoaderModule::TYPE_COMBINED ){
 407                 $resourceLoader = $this->getResourceLoader();
 408                 $filteredModules = array();
 409                 foreach( $modules as $val ){
 410                         $module = $resourceLoader->getModule( $val );
 411                         if( $module instanceof ResourceLoaderModule
 412                                 && $module->getOrigin() <= $this->getAllowedModules( $type )
 413                                 && ( is_null( $position ) || $module->getPosition() == $position ) )
 414                         {
 415                                 $filteredModules[] = $val;
 416                         }
 417                 }
 418                 return $filteredModules;
 419         }
 420
 421         /**
 422          * Get the list of modules to include on this page
 423          *
 424          * @param $filter Bool whether to filter out insufficiently trustworthy modules
 425          * @param $position String if not null, only return modules with this position
 426          * @param $param string
 427          * @return Array of module names
 428          */
 429         public function getModules( $filter = false, $position = null, $param = 'mModules' ) {
 430                 $modules = array_values( array_unique( $this->$param ) );
 431                 return $filter
 432                         ? $this->filterModules( $modules, $position )
 433                         : $modules;
 434         }
 435
 436         /**
 437          * Add one or more modules recognized by the resource loader. Modules added
 438          * through this function will be loaded by the resource loader when the
 439          * page loads.
 440          *
 441          * @param $modules Mixed: module name (string) or array of module names
 442          */
 443         public function addModules( $modules ) {
 444                 $this->mModules = array_merge( $this->mModules, (array)$modules );
 445         }
 446
 447         /**
 448          * Get the list of module JS to include on this page
 449          *
 450          * @param $filter
 451          * @param $position
 452          *
 453          * @return array of module names
 454          */
 455         public function getModuleScripts( $filter = false, $position = null ) {
 456                 return $this->getModules( $filter, $position, 'mModuleScripts' );
 457         }
 458
 459         /**
 460          * Add only JS of one or more modules recognized by the resource loader. Module
 461          * scripts added through this function will be loaded by the resource loader when
 462          * the page loads.
 463          *
 464          * @param $modules Mixed: module name (string) or array of module names
 465          */
 466         public function addModuleScripts( $modules ) {
 467                 $this->mModuleScripts = array_merge( $this->mModuleScripts, (array)$modules );
 468         }
 469
 470         /**
 471          * Get the list of module CSS to include on this page
 472          *
 473          * @param $filter
 474          * @param $position
 475          *
 476          * @return Array of module names
 477          */
 478         public function getModuleStyles( $filter = false, $position = null ) {
 479                 return $this->getModules( $filter,  $position, 'mModuleStyles' );
 480         }
 481
 482         /**
 483          * Add only CSS of one or more modules recognized by the resource loader. Module
 484          * styles added through this function will be loaded by the resource loader when
 485          * the page loads.
 486          *
 487          * @param $modules Mixed: module name (string) or array of module names
 488          */
 489         public function addModuleStyles( $modules ) {
 490                 $this->mModuleStyles = array_merge( $this->mModuleStyles, (array)$modules );
 491         }
 492
 493         /**
 494          * Get the list of module messages to include on this page
 495          *
 496          * @param $filter
 497          * @param $position
 498          *
 499          * @return Array of module names
 500          */
 501         public function getModuleMessages( $filter = false, $position = null ) {
 502                 return $this->getModules( $filter, $position, 'mModuleMessages' );
 503         }
 504
 505         /**
 506          * Add only messages of one or more modules recognized by the resource loader.
 507          * Module messages added through this function will be loaded by the resource
 508          * loader when the page loads.
 509          *
 510          * @param $modules Mixed: module name (string) or array of module names
 511          */
 512         public function addModuleMessages( $modules ) {
 513                 $this->mModuleMessages = array_merge( $this->mModuleMessages, (array)$modules );
 514         }
 515
 516         /**
 517          * Get an array of head items
 518          *
 519          * @return Array
 520          */
 521         function getHeadItemsArray() {
 522                 return $this->mHeadItems;
 523         }
 524
 525         /**
 526          * Get all header items in a string
 527          *
 528          * @return String
 529          */
 530         function getHeadItems() {
 531                 $s = '';
 532                 foreach ( $this->mHeadItems as $item ) {
 533                         $s .= $item;
 534                 }
 535                 return $s;
 536         }
 537
 538         /**
 539          * Add or replace an header item to the output
 540          *
 541          * @param $name String: item name
 542          * @param $value String: raw HTML
 543          */
 544         public function addHeadItem( $name, $value ) {
 545                 $this->mHeadItems[$name] = $value;
 546         }
 547
 548         /**
 549          * Check if the header item $name is already set
 550          *
 551          * @param $name String: item name
 552          * @return Boolean
 553          */
 554         public function hasHeadItem( $name ) {
 555                 return isset( $this->mHeadItems[$name] );
 556         }
 557
 558         /**
 559          * Set the value of the ETag HTTP header, only used if $wgUseETag is true
 560          *
 561          * @param $tag String: value of "ETag" header
 562          */
 563         function setETag( $tag ) {
 564                 $this->mETag = $tag;
 565         }
 566
 567         /**
 568          * Set whether the output should only contain the body of the article,
 569          * without any skin, sidebar, etc.
 570          * Used e.g. when calling with "action=render".
 571          *
 572          * @param $only Boolean: whether to output only the body of the article
 573          */
 574         public function setArticleBodyOnly( $only ) {
 575                 $this->mArticleBodyOnly = $only;
 576         }
 577
 578         /**
 579          * Return whether the output will contain only the body of the article
 580          *
 581          * @return Boolean
 582          */
 583         public function getArticleBodyOnly() {
 584                 return $this->mArticleBodyOnly;
 585         }
 586
 587         /**
 588          * checkLastModified tells the client to use the client-cached page if
 589          * possible. If sucessful, the OutputPage is disabled so that
 590          * any future call to OutputPage->output() have no effect.
 591          *
 592          * Side effect: sets mLastModified for Last-Modified header
 593          *
 594          * @param $timestamp string
 595          *
 596          * @return Boolean: true iff cache-ok headers was sent.
 597          */
 598         public function checkLastModified( $timestamp ) {
 599                 global $wgCachePages, $wgCacheEpoch;
 600
 601                 if ( !$timestamp || $timestamp == '19700101000000' ) {
 602                         wfDebug( __METHOD__ . ": CACHE DISABLED, NO TIMESTAMP\n" );
 603                         return false;
 604                 }
 605                 if( !$wgCachePages ) {
 606                         wfDebug( __METHOD__ . ": CACHE DISABLED\n", false );
 607                         return false;
 608                 }
 609                 if( $this->getUser()->getOption( 'nocache' ) ) {
 610                         wfDebug( __METHOD__ . ": USER DISABLED CACHE\n", false );
 611                         return false;
 612                 }
 613
 614                 $timestamp = wfTimestamp( TS_MW, $timestamp );
 615                 $modifiedTimes = array(
 616                         'page' => $timestamp,
 617                         'user' => $this->getUser()->getTouched(),
 618                         'epoch' => $wgCacheEpoch
 619                 );
 620                 wfRunHooks( 'OutputPageCheckLastModified', array( &$modifiedTimes ) );
 621
 622                 $maxModified = max( $modifiedTimes );
 623                 $this->mLastModified = wfTimestamp( TS_RFC2822, $maxModified );
 624
 625                 if( empty( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) ) {
 626                         wfDebug( __METHOD__ . ": client did not send If-Modified-Since header\n", false );
 627                         return false;
 628                 }
 629
 630                 # Make debug info
 631                 $info = '';
 632                 foreach ( $modifiedTimes as $name => $value ) {
 633                         if ( $info !== '' ) {
 634                                 $info .= ', ';
 635                         }
 636                         $info .= "$name=" . wfTimestamp( TS_ISO_8601, $value );
 637                 }
 638
 639                 # IE sends sizes after the date like this:
 640                 # Wed, 20 Aug 2003 06:51:19 GMT; length=5202
 641                 # this breaks strtotime().
 642                 $clientHeader = preg_replace( '/;.*$/', '', $_SERVER["HTTP_IF_MODIFIED_SINCE"] );
 643
 644                 wfSuppressWarnings(); // E_STRICT system time bitching
 645                 $clientHeaderTime = strtotime( $clientHeader );
 646                 wfRestoreWarnings();
 647                 if ( !$clientHeaderTime ) {
 648                         wfDebug( __METHOD__ . ": unable to parse the client's If-Modified-Since header: $clientHeader\n" );
 649                         return false;
 650                 }
 651                 $clientHeaderTime = wfTimestamp( TS_MW, $clientHeaderTime );
 652
 653                 wfDebug( __METHOD__ . ": client sent If-Modified-Since: " .
 654                         wfTimestamp( TS_ISO_8601, $clientHeaderTime ) . "\n", false );
 655                 wfDebug( __METHOD__ . ": effective Last-Modified: " .
 656                         wfTimestamp( TS_ISO_8601, $maxModified ) . "\n", false );
 657                 if( $clientHeaderTime < $maxModified ) {
 658                         wfDebug( __METHOD__ . ": STALE, $info\n", false );
 659                         return false;
 660                 }
 661
 662                 # Not modified
 663                 # Give a 304 response code and disable body output
 664                 wfDebug( __METHOD__ . ": NOT MODIFIED, $info\n", false );
 665                 ini_set( 'zlib.output_compression', 0 );
 666                 $this->getRequest()->response()->header( "HTTP/1.1 304 Not Modified" );
 667                 $this->sendCacheControl();
 668                 $this->disable();
 669
 670                 // Don't output a compressed blob when using ob_gzhandler;
 671                 // it's technically against HTTP spec and seems to confuse
 672                 // Firefox when the response gets split over two packets.
 673                 wfClearOutputBuffers();
 674
 675                 return true;
 676         }
 677
 678         /**
 679          * Override the last modified timestamp
 680          *
 681          * @param $timestamp String: new timestamp, in a format readable by
 682          *        wfTimestamp()
 683          */
 684         public function setLastModified( $timestamp ) {
 685                 $this->mLastModified = wfTimestamp( TS_RFC2822, $timestamp );
 686         }
 687
 688         /**
 689          * Set the robot policy for the page: <http://www.robotstxt.org/meta.html>
 690          *
 691          * @param $policy String: the literal string to output as the contents of
 692          *   the meta tag.  Will be parsed according to the spec and output in
 693          *   standardized form.
 694          * @return null
 695          */
 696         public function setRobotPolicy( $policy ) {
 697                 $policy = Article::formatRobotPolicy( $policy );
 698
 699                 if( isset( $policy['index'] ) ) {
 700                         $this->setIndexPolicy( $policy['index'] );
 701                 }
 702                 if( isset( $policy['follow'] ) ) {
 703                         $this->setFollowPolicy( $policy['follow'] );
 704                 }
 705         }
 706
 707         /**
 708          * Set the index policy for the page, but leave the follow policy un-
 709          * touched.
 710          *
 711          * @param $policy string Either 'index' or 'noindex'.
 712          * @return null
 713          */
 714         public function setIndexPolicy( $policy ) {
 715                 $policy = trim( $policy );
 716                 if( in_array( $policy, array( 'index', 'noindex' ) ) ) {
 717                         $this->mIndexPolicy = $policy;
 718                 }
 719         }
 720
 721         /**
 722          * Set the follow policy for the page, but leave the index policy un-
 723          * touched.
 724          *
 725          * @param $policy String: either 'follow' or 'nofollow'.
 726          * @return null
 727          */
 728         public function setFollowPolicy( $policy ) {
 729                 $policy = trim( $policy );
 730                 if( in_array( $policy, array( 'follow', 'nofollow' ) ) ) {
 731                         $this->mFollowPolicy = $policy;
 732                 }
 733         }
 734
 735         /**
 736          * Set the new value of the "action text", this will be added to the
 737          * "HTML title", separated from it with " - ".
 738          *
 739          * @param $text String: new value of the "action text"
 740          */
 741         public function setPageTitleActionText( $text ) {
 742                 $this->mPageTitleActionText = $text;
 743         }
 744
 745         /**
 746          * Get the value of the "action text"
 747          *
 748          * @return String
 749          */
 750         public function getPageTitleActionText() {
 751                 if ( isset( $this->mPageTitleActionText ) ) {
 752                         return $this->mPageTitleActionText;
 753                 }
 754         }
 755
 756         /**
 757          * "HTML title" means the contents of <title>.
 758          * It is stored as plain, unescaped text and will be run through htmlspecialchars in the skin file.
 759          *
 760          * @param $name string
 761          */
 762         public function setHTMLTitle( $name ) {
 763                 if ( $name instanceof Message ) {
 764                         $this->mHTMLtitle = $name->setContext( $this->getContext() )->text();
 765                 } else {
 766                         $this->mHTMLtitle = $name;
 767                 }
 768         }
 769
 770         /**
 771          * Return the "HTML title", i.e. the content of the <title> tag.
 772          *
 773          * @return String
 774          */
 775         public function getHTMLTitle() {
 776                 return $this->mHTMLtitle;
 777         }
 778
 779         /**
 780          * "Page title" means the contents of \<h1\>. It is stored as a valid HTML fragment.
 781          * This function allows good tags like \<sup\> in the \<h1\> tag, but not bad tags like \<script\>.
 782          * This function automatically sets \<title\> to the same content as \<h1\> but with all tags removed.
 783          * Bad tags that were escaped in \<h1\> will still be escaped in \<title\>, and good tags like \<i\> will be dropped entirely.
 784          *
 785          * @param $name string|Message
 786          */
 787         public function setPageTitle( $name ) {
 788                 if ( $name instanceof Message ) {
 789                         $name = $name->setContext( $this->getContext() )->text();
 790                 }
 791
 792                 # change "<script>foo&bar</script>" to "&lt;script&gt;foo&amp;bar&lt;/script&gt;"
 793                 # but leave "<i>foobar</i>" alone
 794                 $nameWithTags = Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags( $name ) );
 795                 $this->mPagetitle = $nameWithTags;
 796
 797                 # change "<i>foo&amp;bar</i>" to "foo&bar"
 798                 $this->setHTMLTitle( $this->msg( 'pagetitle', Sanitizer::stripAllTags( $nameWithTags ) ) );
 799         }
 800
 801         /**
 802          * Return the "page title", i.e. the content of the \<h1\> tag.
 803          *
 804          * @return String
 805          */
 806         public function getPageTitle() {
 807                 return $this->mPagetitle;
 808         }
 809
 810         /**
 811          * Set the Title object to use
 812          *
 813          * @param $t Title object
 814          */
 815         public function setTitle( Title $t ) {
 816                 $this->getContext()->setTitle( $t );
 817         }
 818
 819
 820         /**
 821          * Replace the subtile with $str
 822          *
 823          * @param $str String|Message: new value of the subtitle
 824          */
 825         public function setSubtitle( $str ) {
 826                 $this->clearSubtitle();
 827                 $this->addSubtitle( $str );
 828         }
 829
 830         /**
 831          * Add $str to the subtitle
 832          *
 833          * @deprecated in 1.19; use addSubtitle() instead
 834          * @param $str String|Message to add to the subtitle
 835          */
 836         public function appendSubtitle( $str ) {
 837                 $this->addSubtitle( $str );
 838         }
 839
 840         /**
 841          * Add $str to the subtitle
 842          *
 843          * @param $str String|Message to add to the subtitle
 844          */
 845         public function addSubtitle( $str ) {
 846                 if ( $str instanceof Message ) {
 847                         $this->mSubtitle[] = $str->setContext( $this->getContext() )->parse();
 848                 } else {
 849                         $this->mSubtitle[] = $str;
 850                 }
 851         }
 852
 853         /**
 854          * Add a subtitle containing a backlink to a page
 855          *
 856          * @param $title Title to link to
 857          */
 858         public function addBacklinkSubtitle( Title $title ) {
 859                 $query = array();
 860                 if ( $title->isRedirect() ) {
 861                         $query['redirect'] = 'no';
 862                 }
 863                 $this->addSubtitle( $this->msg( 'backlinksubtitle' )->rawParams( Linker::link( $title, null, array(), $query ) ) );
 864         }
 865
 866         /**
 867          * Clear the subtitles
 868          */
 869         public function clearSubtitle() {
 870                 $this->mSubtitle = array();
 871         }
 872
 873         /**
 874          * Get the subtitle
 875          *
 876          * @return String
 877          */
 878         public function getSubtitle() {
 879                 return implode( "<br />\n\t\t\t\t", $this->mSubtitle );
 880         }
 881
 882         /**
 883          * Set the page as printable, i.e. it'll be displayed with with all
 884          * print styles included
 885          */
 886         public function setPrintable() {
 887                 $this->mPrintable = true;
 888         }
 889
 890         /**
 891          * Return whether the page is "printable"
 892          *
 893          * @return Boolean
 894          */
 895         public function isPrintable() {
 896                 return $this->mPrintable;
 897         }
 898
 899         /**
 900          * Disable output completely, i.e. calling output() will have no effect
 901          */
 902         public function disable() {
 903                 $this->mDoNothing = true;
 904         }
 905
 906         /**
 907          * Return whether the output will be completely disabled
 908          *
 909          * @return Boolean
 910          */
 911         public function isDisabled() {
 912                 return $this->mDoNothing;
 913         }
 914
 915         /**
 916          * Show an "add new section" link?
 917          *
 918          * @return Boolean
 919          */
 920         public function showNewSectionLink() {
 921                 return $this->mNewSectionLink;
 922         }
 923
 924         /**
 925          * Forcibly hide the new section link?
 926          *
 927          * @return Boolean
 928          */
 929         public function forceHideNewSectionLink() {
 930                 return $this->mHideNewSectionLink;
 931         }
 932
 933         /**
 934          * Add or remove feed links in the page header
 935          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
 936          * for the new version
 937          * @see addFeedLink()
 938          *
 939          * @param $show Boolean: true: add default feeds, false: remove all feeds
 940          */
 941         public function setSyndicated( $show = true ) {
 942                 if ( $show ) {
 943                         $this->setFeedAppendQuery( false );
 944                 } else {
 945                         $this->mFeedLinks = array();
 946                 }
 947         }
 948
 949         /**
 950          * Add default feeds to the page header
 951          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
 952          * for the new version
 953          * @see addFeedLink()
 954          *
 955          * @param $val String: query to append to feed links or false to output
 956          *        default links
 957          */
 958         public function setFeedAppendQuery( $val ) {
 959                 global $wgAdvertisedFeedTypes;
 960
 961                 $this->mFeedLinks = array();
 962
 963                 foreach ( $wgAdvertisedFeedTypes as $type ) {
 964                         $query = "feed=$type";
 965                         if ( is_string( $val ) ) {
 966                                 $query .= '&' . $val;
 967                         }
 968                         $this->mFeedLinks[$type] = $this->getTitle()->getLocalURL( $query );
 969                 }
 970         }
 971
 972         /**
 973          * Add a feed link to the page header
 974          *
 975          * @param $format String: feed type, should be a key of $wgFeedClasses
 976          * @param $href String: URL
 977          */
 978         public function addFeedLink( $format, $href ) {
 979                 global $wgAdvertisedFeedTypes;
 980
 981                 if ( in_array( $format, $wgAdvertisedFeedTypes ) ) {
 982                         $this->mFeedLinks[$format] = $href;
 983                 }
 984         }
 985
 986         /**
 987          * Should we output feed links for this page?
 988          * @return Boolean
 989          */
 990         public function isSyndicated() {
 991                 return count( $this->mFeedLinks ) > 0;
 992         }
 993
 994         /**
 995          * Return URLs for each supported syndication format for this page.
 996          * @return array associating format keys with URLs
 997          */
 998         public function getSyndicationLinks() {
 999                 return $this->mFeedLinks;
1000         }
1001
1002         /**
1003          * Will currently always return null
1004          *
1005          * @return null
1006          */
1007         public function getFeedAppendQuery() {
1008                 return $this->mFeedLinksAppendQuery;
1009         }
1010
1011         /**
1012          * Set whether the displayed content is related to the source of the
1013          * corresponding article on the wiki
1014          * Setting true will cause the change "article related" toggle to true
1015          *
1016          * @param $v Boolean
1017          */
1018         public function setArticleFlag( $v ) {
1019                 $this->mIsarticle = $v;
1020                 if ( $v ) {
1021                         $this->mIsArticleRelated = $v;
1022                 }
1023         }
1024
1025         /**
1026          * Return whether the content displayed page is related to the source of
1027          * the corresponding article on the wiki
1028          *
1029          * @return Boolean
1030          */
1031         public function isArticle() {
1032                 return $this->mIsarticle;
1033         }
1034
1035         /**
1036          * Set whether this page is related an article on the wiki
1037          * Setting false will cause the change of "article flag" toggle to false
1038          *
1039          * @param $v Boolean
1040          */
1041         public function setArticleRelated( $v ) {
1042                 $this->mIsArticleRelated = $v;
1043                 if ( !$v ) {
1044                         $this->mIsarticle = false;
1045                 }
1046         }
1047
1048         /**
1049          * Return whether this page is related an article on the wiki
1050          *
1051          * @return Boolean
1052          */
1053         public function isArticleRelated() {
1054                 return $this->mIsArticleRelated;
1055         }
1056
1057         /**
1058          * Add new language links
1059          *
1060          * @param $newLinkArray Associative array mapping language code to the page
1061          *                      name
1062          */
1063         public function addLanguageLinks( $newLinkArray ) {
1064                 $this->mLanguageLinks += $newLinkArray;
1065         }
1066
1067         /**
1068          * Reset the language links and add new language links
1069          *
1070          * @param $newLinkArray Associative array mapping language code to the page
1071          *                      name
1072          */
1073         public function setLanguageLinks( $newLinkArray ) {
1074                 $this->mLanguageLinks = $newLinkArray;
1075         }
1076
1077         /**
1078          * Get the list of language links
1079          *
1080          * @return Array of Interwiki Prefixed (non DB key) Titles (e.g. 'fr:Test page')
1081          */
1082         public function getLanguageLinks() {
1083                 return $this->mLanguageLinks;
1084         }
1085
1086         /**
1087          * Add an array of categories, with names in the keys
1088          *
1089          * @param $categories Array mapping category name => sort key
1090          */
1091         public function addCategoryLinks( $categories ) {
1092                 global $wgContLang;
1093
1094                 if ( !is_array( $categories ) || count( $categories ) == 0 ) {
1095                         return;
1096                 }
1097
1098                 # Add the links to a LinkBatch
1099                 $arr = array( NS_CATEGORY => $categories );
1100                 $lb = new LinkBatch;
1101                 $lb->setArray( $arr );
1102
1103                 # Fetch existence plus the hiddencat property
1104                 $dbr = wfGetDB( DB_SLAVE );
1105                 $res = $dbr->select( array( 'page', 'page_props' ),
1106                         array( 'page_id', 'page_namespace', 'page_title', 'page_len', 'page_is_redirect', 'page_latest', 'pp_value' ),
1107                         $lb->constructSet( 'page', $dbr ),
1108                         __METHOD__,
1109                         array(),
1110                         array( 'page_props' => array( 'LEFT JOIN', array( 'pp_propname' => 'hiddencat', 'pp_page = page_id' ) ) )
1111                 );
1112
1113                 # Add the results to the link cache
1114                 $lb->addResultToCache( LinkCache::singleton(), $res );
1115
1116                 # Set all the values to 'normal'. This can be done with array_fill_keys in PHP 5.2.0+
1117                 $categories = array_combine(
1118                         array_keys( $categories ),
1119                         array_fill( 0, count( $categories ), 'normal' )
1120                 );
1121
1122                 # Mark hidden categories
1123                 foreach ( $res as $row ) {
1124                         if ( isset( $row->pp_value ) ) {
1125                                 $categories[$row->page_title] = 'hidden';
1126                         }
1127                 }
1128
1129                 # Add the remaining categories to the skin
1130                 if ( wfRunHooks( 'OutputPageMakeCategoryLinks', array( &$this, $categories, &$this->mCategoryLinks ) ) ) {
1131                         foreach ( $categories as $category => $type ) {
1132                                 $origcategory = $category;
1133                                 $title = Title::makeTitleSafe( NS_CATEGORY, $category );
1134                                 $wgContLang->findVariantLink( $category, $title, true );
1135                                 if ( $category != $origcategory ) {
1136                                         if ( array_key_exists( $category, $categories ) ) {
1137                                                 continue;
1138                                         }
1139                                 }
1140                                 $text = $wgContLang->convertHtml( $title->getText() );
1141                                 $this->mCategories[] = $title->getText();
1142                                 $this->mCategoryLinks[$type][] = Linker::link( $title, $text );
1143                         }
1144                 }
1145         }
1146
1147         /**
1148          * Reset the category links (but not the category list) and add $categories
1149          *
1150          * @param $categories Array mapping category name => sort key
1151          */
1152         public function setCategoryLinks( $categories ) {
1153                 $this->mCategoryLinks = array();
1154                 $this->addCategoryLinks( $categories );
1155         }
1156
1157         /**
1158          * Get the list of category links, in a 2-D array with the following format:
1159          * $arr[$type][] = $link, where $type is either "normal" or "hidden" (for
1160          * hidden categories) and $link a HTML fragment with a link to the category
1161          * page
1162          *
1163          * @return Array
1164          */
1165         public function getCategoryLinks() {
1166                 return $this->mCategoryLinks;
1167         }
1168
1169         /**
1170          * Get the list of category names this page belongs to
1171          *
1172          * @return Array of strings
1173          */
1174         public function getCategories() {
1175                 return $this->mCategories;
1176         }
1177
1178         /**
1179          * Do not allow scripts which can be modified by wiki users to load on this page;
1180          * only allow scripts bundled with, or generated by, the software.
1181          */
1182         public function disallowUserJs() {
1183                 $this->reduceAllowedModules(
1184                         ResourceLoaderModule::TYPE_SCRIPTS,
1185                         ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL
1186                 );
1187         }
1188
1189         /**
1190          * Return whether user JavaScript is allowed for this page
1191          * @deprecated since 1.18 Load modules with ResourceLoader, and origin and
1192          *     trustworthiness is identified and enforced automagically.
1193          * @return Boolean
1194          */
1195         public function isUserJsAllowed() {
1196                 return $this->getAllowedModules( ResourceLoaderModule::TYPE_SCRIPTS ) >= ResourceLoaderModule::ORIGIN_USER_INDIVIDUAL;
1197         }
1198
1199         /**
1200          * Show what level of JavaScript / CSS untrustworthiness is allowed on this page
1201          * @see ResourceLoaderModule::$origin
1202          * @param $type String ResourceLoaderModule TYPE_ constant
1203          * @return Int ResourceLoaderModule ORIGIN_ class constant
1204          */
1205         public function getAllowedModules( $type ){
1206                 if( $type == ResourceLoaderModule::TYPE_COMBINED ){
1207                         return min( array_values( $this->mAllowedModules ) );
1208                 } else {
1209                         return isset( $this->mAllowedModules[$type] )
1210                                 ? $this->mAllowedModules[$type]
1211                                 : ResourceLoaderModule::ORIGIN_ALL;
1212                 }
1213         }
1214
1215         /**
1216          * Set the highest level of CSS/JS untrustworthiness allowed
1217          * @param  $type String ResourceLoaderModule TYPE_ constant
1218          * @param  $level Int ResourceLoaderModule class constant
1219          */
1220         public function setAllowedModules( $type, $level ){
1221                 $this->mAllowedModules[$type] = $level;
1222         }
1223
1224         /**
1225          * As for setAllowedModules(), but don't inadvertantly make the page more accessible
1226          * @param  $type String
1227          * @param  $level Int ResourceLoaderModule class constant
1228          */
1229         public function reduceAllowedModules( $type, $level ){
1230                 $this->mAllowedModules[$type] = min( $this->getAllowedModules($type), $level );
1231         }
1232
1233         /**
1234          * Prepend $text to the body HTML
1235          *
1236          * @param $text String: HTML
1237          */
1238         public function prependHTML( $text ) {
1239                 $this->mBodytext = $text . $this->mBodytext;
1240         }
1241
1242         /**
1243          * Append $text to the body HTML
1244          *
1245          * @param $text String: HTML
1246          */
1247         public function addHTML( $text ) {
1248                 $this->mBodytext .= $text;
1249         }
1250
1251         /**
1252          * Shortcut for adding an Html::element via addHTML.
1253          *
1254          * @since 1.19
1255          *
1256          * @param $element string
1257          * @param $attribs array
1258          * @param $contents string
1259          */
1260         public function addElement( $element, $attribs = array(), $contents = '' ) {
1261                 $this->addHTML( Html::element( $element, $attribs, $contents ) );
1262         }
1263
1264         /**
1265          * Clear the body HTML
1266          */
1267         public function clearHTML() {
1268                 $this->mBodytext = '';
1269         }
1270
1271         /**
1272          * Get the body HTML
1273          *
1274          * @return String: HTML
1275          */
1276         public function getHTML() {
1277                 return $this->mBodytext;
1278         }
1279
1280         /**
1281          * Add $text to the debug output
1282          *
1283          * @param $text String: debug text
1284          */
1285         public function debug( $text ) {
1286                 $this->mDebugtext .= $text;
1287         }
1288
1289         /**
1290          * Get/set the ParserOptions object to use for wikitext parsing
1291          *
1292          * @param $options either the ParserOption to use or null to only get the
1293          *                 current ParserOption object
1294          * @return ParserOptions object
1295          */
1296         public function parserOptions( $options = null ) {
1297                 if ( !$this->mParserOptions ) {
1298                         $this->mParserOptions = ParserOptions::newFromContext( $this->getContext() );
1299                         $this->mParserOptions->setEditSection( false );
1300                 }
1301                 return wfSetVar( $this->mParserOptions, $options );
1302         }
1303
1304         /**
1305          * Set the revision ID which will be seen by the wiki text parser
1306          * for things such as embedded {{REVISIONID}} variable use.
1307          *
1308          * @param $revid Mixed: an positive integer, or null
1309          * @return Mixed: previous value
1310          */
1311         public function setRevisionId( $revid ) {
1312                 $val = is_null( $revid ) ? null : intval( $revid );
1313                 return wfSetVar( $this->mRevisionId, $val );
1314         }
1315
1316         /**
1317          * Get the displayed revision ID
1318          *
1319          * @return Integer
1320          */
1321         public function getRevisionId() {
1322                 return $this->mRevisionId;
1323         }
1324
1325         /**
1326          * Set the displayed file version
1327          *
1328          * @param $file File|false
1329          * @return Mixed: previous value
1330          */
1331         public function setFileVersion( $file ) {
1332                 $val = null;
1333                 if ( $file instanceof File && $file->exists() ) {
1334                         $val = array( 'time' => $file->getTimestamp(), 'sha1' => $file->getSha1() );
1335                 }
1336                 return wfSetVar( $this->mFileVersion, $val, true );
1337         }
1338
1339         /**
1340          * Get the displayed file version
1341          *
1342          * @return Array|null ('time' => MW timestamp, 'sha1' => sha1)
1343          */
1344         public function getFileVersion() {
1345                 return $this->mFileVersion;
1346         }
1347
1348         /**
1349          * Get the templates used on this page
1350          *
1351          * @return Array (namespace => dbKey => revId)
1352          * @since 1.18
1353          */
1354         public function getTemplateIds() {
1355                 return $this->mTemplateIds;
1356         }
1357
1358         /**
1359          * Get the files used on this page
1360          *
1361          * @return Array (dbKey => array('time' => MW timestamp or null, 'sha1' => sha1 or ''))
1362          * @since 1.18
1363          */
1364         public function getFileSearchOptions() {
1365                 return $this->mImageTimeKeys;
1366         }
1367
1368         /**
1369          * Convert wikitext to HTML and add it to the buffer
1370          * Default assumes that the current page title will be used.
1371          *
1372          * @param $text String
1373          * @param $linestart Boolean: is this the start of a line?
1374          * @param $interface Boolean: is this text in the user interface language?
1375          */
1376         public function addWikiText( $text, $linestart = true, $interface = true ) {
1377                 $title = $this->getTitle(); // Work arround E_STRICT
1378                 $this->addWikiTextTitle( $text, $title, $linestart, /*tidy*/false, $interface );
1379         }
1380
1381         /**
1382          * Add wikitext with a custom Title object
1383          *
1384          * @param $text String: wikitext
1385          * @param $title Title object
1386          * @param $linestart Boolean: is this the start of a line?
1387          */
1388         public function addWikiTextWithTitle( $text, &$title, $linestart = true ) {
1389                 $this->addWikiTextTitle( $text, $title, $linestart );
1390         }
1391
1392         /**
1393          * Add wikitext with a custom Title object and tidy enabled.
1394          *
1395          * @param $text String: wikitext
1396          * @param $title Title object
1397          * @param $linestart Boolean: is this the start of a line?
1398          */
1399         function addWikiTextTitleTidy( $text, &$title, $linestart = true ) {
1400                 $this->addWikiTextTitle( $text, $title, $linestart, true );
1401         }
1402
1403         /**
1404          * Add wikitext with tidy enabled
1405          *
1406          * @param $text String: wikitext
1407          * @param $linestart Boolean: is this the start of a line?
1408          */
1409         public function addWikiTextTidy( $text, $linestart = true ) {
1410                 $title = $this->getTitle();
1411                 $this->addWikiTextTitleTidy( $text, $title, $linestart );
1412         }
1413
1414         /**
1415          * Add wikitext with a custom Title object
1416          *
1417          * @param $text String: wikitext
1418          * @param $title Title object
1419          * @param $linestart Boolean: is this the start of a line?
1420          * @param $tidy Boolean: whether to use tidy
1421          * @param $interface Boolean: whether it is an interface message
1422          *                                                              (for example disables conversion)
1423          */
1424         public function addWikiTextTitle( $text, &$title, $linestart, $tidy = false, $interface = false ) {
1425                 global $wgParser;
1426
1427                 wfProfileIn( __METHOD__ );
1428
1429                 wfIncrStats( 'pcache_not_possible' );
1430
1431                 $popts = $this->parserOptions();
1432                 $oldTidy = $popts->setTidy( $tidy );
1433                 $popts->setInterfaceMessage( (bool) $interface );
1434
1435                 $parserOutput = $wgParser->parse(
1436                         $text, $title, $popts,
1437                         $linestart, true, $this->mRevisionId
1438                 );
1439
1440                 $popts->setTidy( $oldTidy );
1441
1442                 $this->addParserOutput( $parserOutput );
1443
1444                 wfProfileOut( __METHOD__ );
1445         }
1446
1447         /**
1448          * Add a ParserOutput object, but without Html
1449          *
1450          * @param $parserOutput ParserOutput object
1451          */
1452         public function addParserOutputNoText( &$parserOutput ) {
1453                 $this->mLanguageLinks += $parserOutput->getLanguageLinks();
1454                 $this->addCategoryLinks( $parserOutput->getCategories() );
1455                 $this->mNewSectionLink = $parserOutput->getNewSection();
1456                 $this->mHideNewSectionLink = $parserOutput->getHideNewSection();
1457
1458                 $this->mParseWarnings = $parserOutput->getWarnings();
1459                 if ( !$parserOutput->isCacheable() ) {
1460                         $this->enableClientCache( false );
1461                 }
1462                 $this->mNoGallery = $parserOutput->getNoGallery();
1463                 $this->mHeadItems = array_merge( $this->mHeadItems, $parserOutput->getHeadItems() );
1464                 $this->addModules( $parserOutput->getModules() );
1465                 $this->addModuleScripts( $parserOutput->getModuleScripts() );
1466                 $this->addModuleStyles( $parserOutput->getModuleStyles() );
1467                 $this->addModuleMessages( $parserOutput->getModuleMessages() );
1468
1469                 // Template versioning...
1470                 foreach ( (array)$parserOutput->getTemplateIds() as $ns => $dbks ) {
1471                         if ( isset( $this->mTemplateIds[$ns] ) ) {
1472                                 $this->mTemplateIds[$ns] = $dbks + $this->mTemplateIds[$ns];
1473                         } else {
1474                                 $this->mTemplateIds[$ns] = $dbks;
1475                         }
1476                 }
1477                 // File versioning...
1478                 foreach ( (array)$parserOutput->getFileSearchOptions() as $dbk => $data ) {
1479                         $this->mImageTimeKeys[$dbk] = $data;
1480                 }
1481
1482                 // Hooks registered in the object
1483                 global $wgParserOutputHooks;
1484                 foreach ( $parserOutput->getOutputHooks() as $hookInfo ) {
1485                         list( $hookName, $data ) = $hookInfo;
1486                         if ( isset( $wgParserOutputHooks[$hookName] ) ) {
1487                                 call_user_func( $wgParserOutputHooks[$hookName], $this, $parserOutput, $data );
1488                         }
1489                 }
1490
1491                 wfRunHooks( 'OutputPageParserOutput', array( &$this, $parserOutput ) );
1492         }
1493
1494         /**
1495          * Add a ParserOutput object
1496          *
1497          * @param $parserOutput ParserOutput
1498          */
1499         function addParserOutput( &$parserOutput ) {
1500                 $this->addParserOutputNoText( $parserOutput );
1501                 $text = $parserOutput->getText();
1502                 wfRunHooks( 'OutputPageBeforeHTML', array( &$this, &$text ) );
1503                 $this->addHTML( $text );
1504         }
1505
1506
1507         /**
1508          * Add the output of a QuickTemplate to the output buffer
1509          *
1510          * @param $template QuickTemplate
1511          */
1512         public function addTemplate( &$template ) {
1513                 ob_start();
1514                 $template->execute();
1515                 $this->addHTML( ob_get_contents() );
1516                 ob_end_clean();
1517         }
1518
1519         /**
1520          * Parse wikitext and return the HTML.
1521          *
1522          * @param $text String
1523          * @param $linestart Boolean: is this the start of a line?
1524          * @param $interface Boolean: use interface language ($wgLang instead of
1525          *                   $wgContLang) while parsing language sensitive magic
1526          *                   words like GRAMMAR and PLURAL. This also disables
1527          *                                       LanguageConverter.
1528          * @param $language  Language object: target language object, will override
1529          *                   $interface
1530          * @return String: HTML
1531          */
1532         public function parse( $text, $linestart = true, $interface = false, $language = null ) {
1533                 global $wgParser;
1534
1535                 if( is_null( $this->getTitle() ) ) {
1536                         throw new MWException( 'Empty $mTitle in ' . __METHOD__ );
1537                 }
1538
1539                 $popts = $this->parserOptions();
1540                 if ( $interface ) {
1541                         $popts->setInterfaceMessage( true );
1542                 }
1543                 if ( $language !== null ) {
1544                         $oldLang = $popts->setTargetLanguage( $language );
1545                 }
1546
1547                 $parserOutput = $wgParser->parse(
1548                         $text, $this->getTitle(), $popts,
1549                         $linestart, true, $this->mRevisionId
1550                 );
1551
1552                 if ( $interface ) {
1553                         $popts->setInterfaceMessage( false );
1554                 }
1555                 if ( $language !== null ) {
1556                         $popts->setTargetLanguage( $oldLang );
1557                 }
1558
1559                 return $parserOutput->getText();
1560         }
1561
1562         /**
1563          * Parse wikitext, strip paragraphs, and return the HTML.
1564          *
1565          * @param $text String
1566          * @param $linestart Boolean: is this the start of a line?
1567          * @param $interface Boolean: use interface language ($wgLang instead of
1568          *                   $wgContLang) while parsing language sensitive magic
1569          *                   words like GRAMMAR and PLURAL
1570          * @return String: HTML
1571          */
1572         public function parseInline( $text, $linestart = true, $interface = false ) {
1573                 $parsed = $this->parse( $text, $linestart, $interface );
1574
1575                 $m = array();
1576                 if ( preg_match( '/^<p>(.*)\n?<\/p>\n?/sU', $parsed, $m ) ) {
1577                         $parsed = $m[1];
1578                 }
1579
1580                 return $parsed;
1581         }
1582
1583         /**
1584          * Set the value of the "s-maxage" part of the "Cache-control" HTTP header
1585          *
1586          * @param $maxage Integer: maximum cache time on the Squid, in seconds.
1587          */
1588         public function setSquidMaxage( $maxage ) {
1589                 $this->mSquidMaxage = $maxage;
1590         }
1591
1592         /**
1593          * Use enableClientCache(false) to force it to send nocache headers
1594          *
1595          * @param $state bool
1596          *
1597          * @return bool
1598          */
1599         public function enableClientCache( $state ) {
1600                 return wfSetVar( $this->mEnableClientCache, $state );
1601         }
1602
1603         /**
1604          * Get the list of cookies that will influence on the cache
1605          *
1606          * @return Array
1607          */
1608         function getCacheVaryCookies() {
1609                 global $wgCookiePrefix, $wgCacheVaryCookies;
1610                 static $cookies;
1611                 if ( $cookies === null ) {
1612                         $cookies = array_merge(
1613                                 array(
1614                                         "{$wgCookiePrefix}Token",
1615                                         "{$wgCookiePrefix}LoggedOut",
1616                                         session_name()
1617                                 ),
1618                                 $wgCacheVaryCookies
1619                         );
1620                         wfRunHooks( 'GetCacheVaryCookies', array( $this, &$cookies ) );
1621                 }
1622                 return $cookies;
1623         }
1624
1625         /**
1626          * Return whether this page is not cacheable because "useskin" or "uselang"
1627          * URL parameters were passed.
1628          *
1629          * @return Boolean
1630          */
1631         function uncacheableBecauseRequestVars() {
1632                 $request = $this->getRequest();
1633                 return $request->getText( 'useskin', false ) === false
1634                         && $request->getText( 'uselang', false ) === false;
1635         }
1636
1637         /**
1638          * Check if the request has a cache-varying cookie header
1639          * If it does, it's very important that we don't allow public caching
1640          *
1641          * @return Boolean
1642          */
1643         function haveCacheVaryCookies() {
1644                 $cookieHeader = $this->getRequest()->getHeader( 'cookie' );
1645                 if ( $cookieHeader === false ) {
1646                         return false;
1647                 }
1648                 $cvCookies = $this->getCacheVaryCookies();
1649                 foreach ( $cvCookies as $cookieName ) {
1650                         # Check for a simple string match, like the way squid does it
1651                         if ( strpos( $cookieHeader, $cookieName ) !== false ) {
1652                                 wfDebug( __METHOD__ . ": found $cookieName\n" );
1653                                 return true;
1654                         }
1655                 }
1656                 wfDebug( __METHOD__ . ": no cache-varying cookies found\n" );
1657                 return false;
1658         }
1659
1660         /**
1661          * Add an HTTP header that will influence on the cache
1662          *
1663          * @param $header String: header name
1664          * @param $option Array|null
1665          * @todo FIXME: Document the $option parameter; it appears to be for
1666          *        X-Vary-Options but what format is acceptable?
1667          */
1668         public function addVaryHeader( $header, $option = null ) {
1669                 if ( !array_key_exists( $header, $this->mVaryHeader ) ) {
1670                         $this->mVaryHeader[$header] = (array)$option;
1671                 } elseif( is_array( $option ) ) {
1672                         if( is_array( $this->mVaryHeader[$header] ) ) {
1673                                 $this->mVaryHeader[$header] = array_merge( $this->mVaryHeader[$header], $option );
1674                         } else {
1675                                 $this->mVaryHeader[$header] = $option;
1676                         }
1677                 }
1678                 $this->mVaryHeader[$header] = array_unique( (array)$this->mVaryHeader[$header] );
1679         }
1680
1681         /**
1682          * Get a complete X-Vary-Options header
1683          *
1684          * @return String
1685          */
1686         public function getXVO() {
1687                 $cvCookies = $this->getCacheVaryCookies();
1688
1689                 $cookiesOption = array();
1690                 foreach ( $cvCookies as $cookieName ) {
1691                         $cookiesOption[] = 'string-contains=' . $cookieName;
1692                 }
1693                 $this->addVaryHeader( 'Cookie', $cookiesOption );
1694
1695                 $headers = array();
1696                 foreach( $this->mVaryHeader as $header => $option ) {
1697                         $newheader = $header;
1698                         if( is_array( $option ) ) {
1699                                 $newheader .= ';' . implode( ';', $option );
1700                         }
1701                         $headers[] = $newheader;
1702                 }
1703                 $xvo = 'X-Vary-Options: ' . implode( ',', $headers );
1704
1705                 return $xvo;
1706         }
1707
1708         /**
1709          * bug 21672: Add Accept-Language to Vary and XVO headers
1710          * if there's no 'variant' parameter existed in GET.
1711          *
1712          * For example:
1713          *   /w/index.php?title=Main_page should always be served; but
1714          *   /w/index.php?title=Main_page&variant=zh-cn should never be served.
1715          */
1716         function addAcceptLanguage() {
1717                 $lang = $this->getTitle()->getPageLanguage();
1718                 if( !$this->getRequest()->getCheck( 'variant' ) && $lang->hasVariants() ) {
1719                         $variants = $lang->getVariants();
1720                         $aloption = array();
1721                         foreach ( $variants as $variant ) {
1722                                 if( $variant === $lang->getCode() ) {
1723                                         continue;
1724                                 } else {
1725                                         $aloption[] = 'string-contains=' . $variant;
1726
1727                                         // IE and some other browsers use another form of language code
1728                                         // in their Accept-Language header, like "zh-CN" or "zh-TW".
1729                                         // We should handle these too.
1730                                         $ievariant = explode( '-', $variant );
1731                                         if ( count( $ievariant ) == 2 ) {
1732                                                 $ievariant[1] = strtoupper( $ievariant[1] );
1733                                                 $ievariant = implode( '-', $ievariant );
1734                                                 $aloption[] = 'string-contains=' . $ievariant;
1735                                         }
1736                                 }
1737                         }
1738                         $this->addVaryHeader( 'Accept-Language', $aloption );
1739                 }
1740         }
1741
1742         /**
1743          * Set a flag which will cause an X-Frame-Options header appropriate for
1744          * edit pages to be sent. The header value is controlled by
1745          * $wgEditPageFrameOptions.
1746          *
1747          * This is the default for special pages. If you display a CSRF-protected
1748          * form on an ordinary view page, then you need to call this function.
1749          *
1750          * @param $enable bool
1751          */
1752         public function preventClickjacking( $enable = true ) {
1753                 $this->mPreventClickjacking = $enable;
1754         }
1755
1756         /**
1757          * Turn off frame-breaking. Alias for $this->preventClickjacking(false).
1758          * This can be called from pages which do not contain any CSRF-protected
1759          * HTML form.
1760          */
1761         public function allowClickjacking() {
1762                 $this->mPreventClickjacking = false;
1763         }
1764
1765         /**
1766          * Get the X-Frame-Options header value (without the name part), or false
1767          * if there isn't one. This is used by Skin to determine whether to enable
1768          * JavaScript frame-breaking, for clients that don't support X-Frame-Options.
1769          *
1770          * @return string
1771          */
1772         public function getFrameOptions() {
1773                 global $wgBreakFrames, $wgEditPageFrameOptions;
1774                 if ( $wgBreakFrames ) {
1775                         return 'DENY';
1776                 } elseif ( $this->mPreventClickjacking && $wgEditPageFrameOptions ) {
1777                         return $wgEditPageFrameOptions;
1778                 }
1779                 return false;
1780         }
1781
1782         /**
1783          * Send cache control HTTP headers
1784          */
1785         public function sendCacheControl() {
1786                 global $wgUseSquid, $wgUseESI, $wgUseETag, $wgSquidMaxage, $wgUseXVO;
1787
1788                 $response = $this->getRequest()->response();
1789                 if ( $wgUseETag && $this->mETag ) {
1790                         $response->header( "ETag: $this->mETag" );
1791                 }
1792
1793                 $this->addAcceptLanguage();
1794
1795                 # don't serve compressed data to clients who can't handle it
1796                 # maintain different caches for logged-in users and non-logged in ones
1797                 $response->header( 'Vary: ' . join( ', ', array_keys( $this->mVaryHeader ) ) );
1798
1799                 if ( $wgUseXVO ) {
1800                         # Add an X-Vary-Options header for Squid with Wikimedia patches
1801                         $response->header( $this->getXVO() );
1802                 }
1803
1804                 if( !$this->uncacheableBecauseRequestVars() && $this->mEnableClientCache ) {
1805                         if(
1806                                 $wgUseSquid && session_id() == '' && !$this->isPrintable() &&
1807                                 $this->mSquidMaxage != 0 && !$this->haveCacheVaryCookies()
1808                         )
1809                         {
1810                                 if ( $wgUseESI ) {
1811                                         # We'll purge the proxy cache explicitly, but require end user agents
1812                                         # to revalidate against the proxy on each visit.
1813                                         # Surrogate-Control controls our Squid, Cache-Control downstream caches
1814                                         wfDebug( __METHOD__ . ": proxy caching with ESI; {$this->mLastModified} **\n", false );
1815                                         # start with a shorter timeout for initial testing
1816                                         # header( 'Surrogate-Control: max-age=2678400+2678400, content="ESI/1.0"');
1817                                         $response->header( 'Surrogate-Control: max-age='.$wgSquidMaxage.'+'.$this->mSquidMaxage.', content="ESI/1.0"');
1818                                         $response->header( 'Cache-Control: s-maxage=0, must-revalidate, max-age=0' );
1819                                 } else {
1820                                         # We'll purge the proxy cache for anons explicitly, but require end user agents
1821                                         # to revalidate against the proxy on each visit.
1822                                         # IMPORTANT! The Squid needs to replace the Cache-Control header with
1823                                         # Cache-Control: s-maxage=0, must-revalidate, max-age=0
1824                                         wfDebug( __METHOD__ . ": local proxy caching; {$this->mLastModified} **\n", false );
1825                                         # start with a shorter timeout for initial testing
1826                                         # header( "Cache-Control: s-maxage=2678400, must-revalidate, max-age=0" );
1827                                         $response->header( 'Cache-Control: s-maxage='.$this->mSquidMaxage.', must-revalidate, max-age=0' );
1828                                 }
1829                         } else {
1830                                 # We do want clients to cache if they can, but they *must* check for updates
1831                                 # on revisiting the page.
1832                                 wfDebug( __METHOD__ . ": private caching; {$this->mLastModified} **\n", false );
1833                                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1834                                 $response->header( "Cache-Control: private, must-revalidate, max-age=0" );
1835                         }
1836                         if($this->mLastModified) {
1837                                 $response->header( "Last-Modified: {$this->mLastModified}" );
1838                         }
1839                 } else {
1840                         wfDebug( __METHOD__ . ": no caching **\n", false );
1841
1842                         # In general, the absence of a last modified header should be enough to prevent
1843                         # the client from using its cache. We send a few other things just to make sure.
1844                         $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1845                         $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
1846                         $response->header( 'Pragma: no-cache' );
1847                 }
1848         }
1849
1850         /**
1851          * Get the message associed with the HTTP response code $code
1852          *
1853          * @param $code Integer: status code
1854          * @return String or null: message or null if $code is not in the list of
1855          *         messages
1856          *
1857          * @deprecated since 1.18 Use HttpStatus::getMessage() instead.
1858          */
1859         public static function getStatusMessage( $code ) {
1860                 wfDeprecated( __METHOD__ );
1861                 return HttpStatus::getMessage( $code );
1862         }
1863
1864         /**
1865          * Finally, all the text has been munged and accumulated into
1866          * the object, let's actually output it:
1867          */
1868         public function output() {
1869                 global $wgLanguageCode, $wgDebugRedirects, $wgMimeType, $wgVaryOnXFP;
1870
1871                 if( $this->mDoNothing ) {
1872                         return;
1873                 }
1874
1875                 wfProfileIn( __METHOD__ );
1876
1877                 $response = $this->getRequest()->response();
1878
1879                 if ( $this->mRedirect != '' ) {
1880                         # Standards require redirect URLs to be absolute
1881                         $this->mRedirect = wfExpandUrl( $this->mRedirect, PROTO_CURRENT );
1882                         if( $this->mRedirectCode == '301' || $this->mRedirectCode == '303' ) {
1883                                 if( !$wgDebugRedirects ) {
1884                                         $message = HttpStatus::getMessage( $this->mRedirectCode );
1885                                         $response->header( "HTTP/1.1 {$this->mRedirectCode} $message" );
1886                                 }
1887                                 $this->mLastModified = wfTimestamp( TS_RFC2822 );
1888                         }
1889                         if ( $wgVaryOnXFP ) {
1890                                 $this->addVaryHeader( 'X-Forwarded-Proto' );
1891                         }
1892                         $this->sendCacheControl();
1893
1894                         $response->header( "Content-Type: text/html; charset=utf-8" );
1895                         if( $wgDebugRedirects ) {
1896                                 $url = htmlspecialchars( $this->mRedirect );
1897                                 print "<html>\n<head>\n<title>Redirect</title>\n</head>\n<body>\n";
1898                                 print "<p>Location: <a href=\"$url\">$url</a></p>\n";
1899                                 print "</body>\n</html>\n";
1900                         } else {
1901                                 $response->header( 'Location: ' . $this->mRedirect );
1902                         }
1903                         wfProfileOut( __METHOD__ );
1904                         return;
1905                 } elseif ( $this->mStatusCode ) {
1906                         $message = HttpStatus::getMessage( $this->mStatusCode );
1907                         if ( $message ) {
1908                                 $response->header( 'HTTP/1.1 ' . $this->mStatusCode . ' ' . $message );
1909                         }
1910                 }
1911
1912                 # Buffer output; final headers may depend on later processing
1913                 ob_start();
1914
1915                 $response->header( "Content-type: $wgMimeType; charset=UTF-8" );
1916                 $response->header( 'Content-language: ' . $wgLanguageCode );
1917
1918                 // Prevent framing, if requested
1919                 $frameOptions = $this->getFrameOptions();
1920                 if ( $frameOptions ) {
1921                         $response->header( "X-Frame-Options: $frameOptions" );
1922                 }
1923
1924                 if ( $this->mArticleBodyOnly ) {
1925                         $this->out( $this->mBodytext );
1926                 } else {
1927                         $this->addDefaultModules();
1928
1929                         $sk = $this->getSkin();
1930
1931                         // Hook that allows last minute changes to the output page, e.g.
1932                         // adding of CSS or Javascript by extensions.
1933                         wfRunHooks( 'BeforePageDisplay', array( &$this, &$sk ) );
1934
1935                         wfProfileIn( 'Output-skin' );
1936                         $sk->outputPage();
1937                         wfProfileOut( 'Output-skin' );
1938                 }
1939
1940                 $this->sendCacheControl();
1941                 ob_end_flush();
1942                 wfProfileOut( __METHOD__ );
1943         }
1944
1945         /**
1946          * Actually output something with print().
1947          *
1948          * @param $ins String: the string to output
1949          */
1950         public function out( $ins ) {
1951                 print $ins;
1952         }
1953
1954         /**
1955          * Produce a "user is blocked" page.
1956          * @deprecated since 1.18
1957          */
1958         function blockedPage() {
1959                 throw new UserBlockedError( $this->getUser()->mBlock );
1960         }
1961
1962         /**
1963          * Prepare this object to display an error page; disable caching and
1964          * indexing, clear the current text and redirect, set the page's title
1965          * and optionally an custom HTML title (content of the <title> tag).
1966          *
1967          * @param $pageTitle String|Message will be passed directly to setPageTitle()
1968          * @param $htmlTitle String|Message will be passed directly to setHTMLTitle();
1969          *                   optional, if not passed the <title> attribute will be
1970          *                   based on $pageTitle
1971          */
1972         public function prepareErrorPage( $pageTitle, $htmlTitle = false ) {
1973                 if ( $this->getTitle() ) {
1974                         $this->mDebugtext .= 'Original title: ' . $this->getTitle()->getPrefixedText() . "\n";
1975                 }
1976
1977                 $this->setPageTitle( $pageTitle );
1978                 if ( $htmlTitle !== false ) {
1979                         $this->setHTMLTitle( $htmlTitle );
1980                 }
1981                 $this->setRobotPolicy( 'noindex,nofollow' );
1982                 $this->setArticleRelated( false );
1983                 $this->enableClientCache( false );
1984                 $this->mRedirect = '';
1985                 $this->clearSubtitle();
1986                 $this->clearHTML();
1987         }
1988
1989         /**
1990          * Output a standard error page
1991          *
1992          * showErrorPage( 'titlemsg', 'pagetextmsg', array( 'param1', 'param2' ) );
1993          * showErrorPage( 'titlemsg', $messageObject );
1994          *
1995          * @param $title String: message key for page title
1996          * @param $msg Mixed: message key (string) for page text, or a Message object
1997          * @param $params Array: message parameters; ignored if $msg is a Message object
1998          */
1999         public function showErrorPage( $title, $msg, $params = array() ) {
2000                 $this->prepareErrorPage( $this->msg( $title ), $this->msg( 'errorpagetitle' ) );
2001
2002                 if ( $msg instanceof Message ){
2003                         $this->addHTML( $msg->parse() );
2004                 } else {
2005                         $this->addWikiMsgArray( $msg, $params );
2006                 }
2007
2008                 $this->returnToMain();
2009         }
2010
2011         /**
2012          * Output a standard permission error page
2013          *
2014          * @param $errors Array: error message keys
2015          * @param $action String: action that was denied or null if unknown
2016          */
2017         public function showPermissionsErrorPage( $errors, $action = null ) {
2018                 global $wgGroupPermissions;
2019
2020                 // For some action (read, edit, create and upload), display a "login to do this action"
2021                 // error if all of the following conditions are met:
2022                 // 1. the user is not logged in
2023                 // 2. the only error is insufficient permissions (i.e. no block or something else)
2024                 // 3. the error can be avoided simply by logging in
2025                 if ( in_array( $action, array( 'read', 'edit', 'createpage', 'createtalk', 'upload' ) )
2026                         && $this->getUser()->isAnon() && count( $errors ) == 1 && isset( $errors[0][0] )
2027                         && ( $errors[0][0] == 'badaccess-groups' || $errors[0][0] == 'badaccess-group0' )
2028                         && ( ( isset( $wgGroupPermissions['user'][$action] ) && $wgGroupPermissions['user'][$action] )
2029                         || ( isset( $wgGroupPermissions['autoconfirmed'][$action] ) && $wgGroupPermissions['autoconfirmed'][$action] ) )
2030                 ) {
2031                         $displayReturnto = null;
2032                         $returnto = $this->getTitle();
2033                         if ( $action == 'edit' ) {
2034                                 $msg = 'whitelistedittext';
2035                                 $displayReturnto = $returnto;
2036                         } elseif ( $action == 'createpage' || $action == 'createtalk' ) {
2037                                 $msg = 'nocreatetext';
2038                         } elseif ( $action == 'upload' ) {
2039                                 $msg = 'uploadnologintext';
2040                         } else { # Read
2041                                 $msg = 'loginreqpagetext';
2042                                 $displayReturnto = Title::newMainPage();
2043                         }
2044
2045                         $query = array();
2046                         if ( $returnto ) {
2047                                 $query['returnto'] = $returnto->getPrefixedText();
2048                                 $request = $this->getRequest();
2049                                 if ( !$request->wasPosted() ) {
2050                                         $returntoquery = $request->getValues();
2051                                         unset( $returntoquery['title'] );
2052                                         unset( $returntoquery['returnto'] );
2053                                         unset( $returntoquery['returntoquery'] );
2054                                         $query['returntoquery'] = wfArrayToCGI( $returntoquery );
2055                                 }
2056                         }
2057                         $loginLink = Linker::linkKnown(
2058                                 SpecialPage::getTitleFor( 'Userlogin' ),
2059                                 $this->msg( 'loginreqlink' )->escaped(),
2060                                 array(),
2061                                 $query
2062                         );
2063
2064                         $this->prepareErrorPage( $this->msg( 'loginreqtitle' ) );
2065                         $this->addHTML( $this->msg( $msg )->rawParams( $loginLink )->parse() );
2066
2067                         # Don't return to a page the user can't read otherwise
2068                         # we'll end up in a pointless loop
2069                         if ( $displayReturnto && $displayReturnto->userCanRead() ) {
2070                                 $this->returnToMain( null, $displayReturnto );
2071                         }
2072                 } else {
2073                         $this->prepareErrorPage( $this->msg( 'permissionserrors' ) );
2074                         $this->addWikiText( $this->formatPermissionsErrorMessage( $errors, $action ) );
2075                 }
2076         }
2077
2078         /**
2079          * Display an error page indicating that a given version of MediaWiki is
2080          * required to use it
2081          *
2082          * @param $version Mixed: the version of MediaWiki needed to use the page
2083          */
2084         public function versionRequired( $version ) {
2085                 $this->prepareErrorPage( $this->msg( 'versionrequired', $version ) );
2086
2087                 $this->addWikiMsg( 'versionrequiredtext', $version );
2088                 $this->returnToMain();
2089         }
2090
2091         /**
2092          * Display an error page noting that a given permission bit is required.
2093          * @deprecated since 1.18, just throw the exception directly
2094          * @param $permission String: key required
2095          */
2096         public function permissionRequired( $permission ) {
2097                 throw new PermissionsError( $permission );
2098         }
2099
2100         /**
2101          * Produce the stock "please login to use the wiki" page
2102          *
2103          * @deprecated in 1.19; throw the exception directly
2104          */
2105         public function loginToUse() {
2106                 throw new PermissionsError( 'read' );
2107         }
2108
2109         /**
2110          * Format a list of error messages
2111          *
2112          * @param $errors Array of arrays returned by Title::getUserPermissionsErrors
2113          * @param $action String: action that was denied or null if unknown
2114          * @return String: the wikitext error-messages, formatted into a list.
2115          */
2116         public function formatPermissionsErrorMessage( $errors, $action = null ) {
2117                 if ( $action == null ) {
2118                         $text = $this->msg( 'permissionserrorstext', count( $errors ) )->plain() . "\n\n";
2119                 } else {
2120                         $action_desc = $this->msg( "action-$action" )->plain();
2121                         $text = $this->msg(
2122                                 'permissionserrorstext-withaction',
2123                                 count( $errors ),
2124                                 $action_desc
2125                         )->plain() . "\n\n";
2126                 }
2127
2128                 if ( count( $errors ) > 1 ) {
2129                         $text .= '<ul class="permissions-errors">' . "\n";
2130
2131                         foreach( $errors as $error ) {
2132                                 $text .= '<li>';
2133                                 $text .= call_user_func_array( array( $this, 'msg' ), $error )->plain();
2134                                 $text .= "</li>\n";
2135                         }
2136                         $text .= '</ul>';
2137                 } else {
2138                         $text .= "<div class=\"permissions-errors\">\n" .
2139                                         call_user_func_array( array( $this, 'msg' ), reset( $errors ) )->plain() .
2140                                         "\n</div>";
2141                 }
2142
2143                 return $text;
2144         }
2145
2146         /**
2147          * Display a page stating that the Wiki is in read-only mode,
2148          * and optionally show the source of the page that the user
2149          * was trying to edit.  Should only be called (for this
2150          * purpose) after wfReadOnly() has returned true.
2151          *
2152          * For historical reasons, this function is _also_ used to
2153          * show the error message when a user tries to edit a page
2154          * they are not allowed to edit.  (Unless it's because they're
2155          * blocked, then we show blockedPage() instead.)  In this
2156          * case, the second parameter should be set to true and a list
2157          * of reasons supplied as the third parameter.
2158          *
2159          * @todo Needs to be split into multiple functions.
2160          *
2161          * @param $source    String: source code to show (or null).
2162          * @param $protected Boolean: is this a permissions error?
2163          * @param $reasons   Array: list of reasons for this error, as returned by Title::getUserPermissionsErrors().
2164          * @param $action    String: action that was denied or null if unknown
2165          */
2166         public function readOnlyPage( $source = null, $protected = false, $reasons = array(), $action = null ) {
2167                 $this->setRobotPolicy( 'noindex,nofollow' );
2168                 $this->setArticleRelated( false );
2169
2170                 // If no reason is given, just supply a default "I can't let you do
2171                 // that, Dave" message.  Should only occur if called by legacy code.
2172                 if ( $protected && empty( $reasons ) ) {
2173                         $reasons[] = array( 'badaccess-group0' );
2174                 }
2175
2176                 if ( !empty( $reasons ) ) {
2177                         // Permissions error
2178                         if( $source ) {
2179                                 $this->setPageTitle( $this->msg( 'viewsource-title', $this->getTitle()->getPrefixedText() ) );
2180                                 $this->addBacklinkSubtitle( $this->getTitle() );
2181                         } else {
2182                                 $this->setPageTitle( $this->msg( 'badaccess' ) );
2183                         }
2184                         $this->addWikiText( $this->formatPermissionsErrorMessage( $reasons, $action ) );
2185                 } else {
2186                         // Wiki is read only
2187                         throw new ReadOnlyError;
2188                 }
2189
2190                 // Show source, if supplied
2191                 if( is_string( $source ) ) {
2192                         $this->addWikiMsg( 'viewsourcetext' );
2193
2194                         $pageLang = $this->getTitle()->getPageLanguage();
2195                         $params = array(
2196                                 'id'   => 'wpTextbox1',
2197                                 'name' => 'wpTextbox1',
2198                                 'cols' => $this->getUser()->getOption( 'cols' ),
2199                                 'rows' => $this->getUser()->getOption( 'rows' ),
2200                                 'readonly' => 'readonly',
2201                                 'lang' => $pageLang->getCode(),
2202                                 'dir' => $pageLang->getDir(),
2203                         );
2204                         $this->addHTML( Html::element( 'textarea', $params, $source ) );
2205
2206                         // Show templates used by this article
2207                         $page = WikiPage::factory( $this->getTitle() );
2208                         $templates = Linker::formatTemplates( $page->getUsedTemplates() );
2209                         $this->addHTML( "<div class='templatesUsed'>
2210 $templates
2211 </div>
2212 " );
2213                 }
2214
2215                 # If the title doesn't exist, it's fairly pointless to print a return
2216                 # link to it.  After all, you just tried editing it and couldn't, so
2217                 # what's there to do there?
2218                 if( $this->getTitle()->exists() ) {
2219                         $this->returnToMain( null, $this->getTitle() );
2220                 }
2221         }
2222
2223         /**
2224          * Turn off regular page output and return an error reponse
2225          * for when rate limiting has triggered.
2226          */
2227         public function rateLimited() {
2228                 throw new ThrottledError;
2229         }
2230
2231         /**
2232          * Show a warning about slave lag
2233          *
2234          * If the lag is higher than $wgSlaveLagCritical seconds,
2235          * then the warning is a bit more obvious. If the lag is
2236          * lower than $wgSlaveLagWarning, then no warning is shown.
2237          *
2238          * @param $lag Integer: slave lag
2239          */
2240         public function showLagWarning( $lag ) {
2241                 global $wgSlaveLagWarning, $wgSlaveLagCritical;
2242                 if( $lag >= $wgSlaveLagWarning ) {
2243                         $message = $lag < $wgSlaveLagCritical
2244                                 ? 'lag-warn-normal'
2245                                 : 'lag-warn-high';
2246                         $wrap = Html::rawElement( 'div', array( 'class' => "mw-{$message}" ), "\n$1\n" );
2247                         $this->wrapWikiMsg( "$wrap\n", array( $message, $this->getLanguage()->formatNum( $lag ) ) );
2248                 }
2249         }
2250
2251         public function showFatalError( $message ) {
2252                 $this->prepareErrorPage( $this->msg( 'internalerror' ) );
2253
2254                 $this->addHTML( $message );
2255         }
2256
2257         public function showUnexpectedValueError( $name, $val ) {
2258                 $this->showFatalError( $this->msg( 'unexpected', $name, $val )->text() );
2259         }
2260
2261         public function showFileCopyError( $old, $new ) {
2262                 $this->showFatalError( $this->msg( 'filecopyerror', $old, $new )->text() );
2263         }
2264
2265         public function showFileRenameError( $old, $new ) {
2266                 $this->showFatalError( $this->msg( 'filerenameerror', $old, $new )->text() );
2267         }
2268
2269         public function showFileDeleteError( $name ) {
2270                 $this->showFatalError( $this->msg( 'filedeleteerror', $name )->text() );
2271         }
2272
2273         public function showFileNotFoundError( $name ) {
2274                 $this->showFatalError( $this->msg( 'filenotfound', $name )->text() );
2275         }
2276
2277         /**
2278          * Add a "return to" link pointing to a specified title
2279          *
2280          * @param $title Title to link
2281          * @param $query String query string
2282          * @param $text String text of the link (input is not escaped)
2283          */
2284         public function addReturnTo( $title, $query = array(), $text = null ) {
2285                 $this->addLink( array( 'rel' => 'next', 'href' => $title->getFullURL() ) );
2286                 $link = $this->msg( 'returnto' )->rawParams(
2287                         Linker::link( $title, $text, array(), $query ) )->escaped();
2288                 $this->addHTML( "<p id=\"mw-returnto\">{$link}</p>\n" );
2289         }
2290
2291         /**
2292          * Add a "return to" link pointing to a specified title,
2293          * or the title indicated in the request, or else the main page
2294          *
2295          * @param $unused No longer used
2296          * @param $returnto Title or String to return to
2297          * @param $returntoquery String: query string for the return to link
2298          */
2299         public function returnToMain( $unused = null, $returnto = null, $returntoquery = null ) {
2300                 if ( $returnto == null ) {
2301                         $returnto = $this->getRequest()->getText( 'returnto' );
2302                 }
2303
2304                 if ( $returntoquery == null ) {
2305                         $returntoquery = $this->getRequest()->getText( 'returntoquery' );
2306                 }
2307
2308                 if ( $returnto === '' ) {
2309                         $returnto = Title::newMainPage();
2310                 }
2311
2312                 if ( is_object( $returnto ) ) {
2313                         $titleObj = $returnto;
2314                 } else {
2315                         $titleObj = Title::newFromText( $returnto );
2316                 }
2317                 if ( !is_object( $titleObj ) ) {
2318                         $titleObj = Title::newMainPage();
2319                 }
2320
2321                 $this->addReturnTo( $titleObj, $returntoquery );
2322         }
2323
2324         /**
2325          * @param $sk Skin The given Skin
2326          * @param $includeStyle Boolean: unused
2327          * @return String: The doctype, opening <html>, and head element.
2328          */
2329         public function headElement( Skin $sk, $includeStyle = true ) {
2330                 global $wgContLang;
2331                 $userdir = $this->getLanguage()->getDir();
2332                 $sitedir = $wgContLang->getDir();
2333
2334                 if ( $sk->commonPrintStylesheet() ) {
2335                         $this->addModuleStyles( 'mediawiki.legacy.wikiprintable' );
2336                 }
2337
2338                 $ret = Html::htmlHeader( array( 'lang' => $this->getLanguage()->getCode(), 'dir' => $userdir, 'class' => 'client-nojs' ) );
2339
2340                 if ( $this->getHTMLTitle() == '' ) {
2341                         $this->setHTMLTitle( $this->msg( 'pagetitle', $this->getPageTitle() ) );
2342                 }
2343
2344                 $openHead = Html::openElement( 'head' );
2345                 if ( $openHead ) {
2346                         # Don't bother with the newline if $head == ''
2347                         $ret .= "$openHead\n";
2348                 }
2349
2350                 $ret .= Html::element( 'title', null, $this->getHTMLTitle() ) . "\n";
2351
2352                 $ret .= implode( "\n", array(
2353                         $this->getHeadLinks( null, true ),
2354                         $this->buildCssLinks(),
2355                         $this->getHeadScripts(),
2356                         $this->getHeadItems()
2357                 ) );
2358
2359                 $closeHead = Html::closeElement( 'head' );
2360                 if ( $closeHead ) {
2361                         $ret .= "$closeHead\n";
2362                 }
2363
2364                 $bodyAttrs = array();
2365
2366                 # Classes for LTR/RTL directionality support
2367                 $bodyAttrs['class'] = "mediawiki $userdir sitedir-$sitedir";
2368
2369                 if ( $this->getLanguage()->capitalizeAllNouns() ) {
2370                         # A <body> class is probably not the best way to do this . . .
2371                         $bodyAttrs['class'] .= ' capitalize-all-nouns';
2372                 }
2373                 $bodyAttrs['class'] .= ' ' . $sk->getPageClasses( $this->getTitle() );
2374                 $bodyAttrs['class'] .= ' skin-' . Sanitizer::escapeClass( $sk->getSkinName() );
2375
2376                 $sk->addToBodyAttributes( $this, $bodyAttrs ); // Allow skins to add body attributes they need
2377                 wfRunHooks( 'OutputPageBodyAttributes', array( $this, $sk, &$bodyAttrs ) );
2378
2379                 $ret .= Html::openElement( 'body', $bodyAttrs ) . "\n";
2380
2381                 return $ret;
2382         }
2383
2384         /**
2385          * Add the default ResourceLoader modules to this object
2386          */
2387         private function addDefaultModules() {
2388                 global $wgIncludeLegacyJavaScript, $wgUseAjax, $wgAjaxWatch, $wgEnableMWSuggest;
2389
2390                 // Add base resources
2391                 $this->addModules( array(
2392                         'mediawiki.user',
2393                         'mediawiki.util',
2394                         'mediawiki.page.startup',
2395                         'mediawiki.page.ready',
2396                 ) );
2397                 if ( $wgIncludeLegacyJavaScript ){
2398                         $this->addModules( 'mediawiki.legacy.wikibits' );
2399                 }
2400
2401                 // Add various resources if required
2402                 if ( $wgUseAjax ) {
2403                         $this->addModules( 'mediawiki.legacy.ajax' );
2404
2405                         wfRunHooks( 'AjaxAddScript', array( &$this ) );
2406
2407                         if( $wgAjaxWatch && $this->getUser()->isLoggedIn() ) {
2408                                 $this->addModules( 'mediawiki.action.watch.ajax' );
2409                         }
2410
2411                         if ( $wgEnableMWSuggest && !$this->getUser()->getOption( 'disablesuggest', false ) ) {
2412                                 $this->addModules( 'mediawiki.legacy.mwsuggest' );
2413                         }
2414                 }
2415
2416                 if ( $this->getUser()->getBoolOption( 'editsectiononrightclick' ) ) {
2417                         $this->addModules( 'mediawiki.action.view.rightClickEdit' );
2418                 }
2419
2420                 # Crazy edit-on-double-click stuff
2421                 if ( $this->isArticle() && $this->getUser()->getOption( 'editondblclick' ) ) {
2422                         $this->addModules( 'mediawiki.action.view.dblClickEdit' );
2423                 }
2424         }
2425
2426         /**
2427          * Get a ResourceLoader object associated with this OutputPage
2428          *
2429          * @return ResourceLoader
2430          */
2431         public function getResourceLoader() {
2432                 if ( is_null( $this->mResourceLoader ) ) {
2433                         $this->mResourceLoader = new ResourceLoader();
2434                 }
2435                 return $this->mResourceLoader;
2436         }
2437
2438         /**
2439          * TODO: Document
2440          * @param $modules Array/string with the module name(s)
2441          * @param $only String ResourceLoaderModule TYPE_ class constant
2442          * @param $useESI boolean
2443          * @param $extraQuery Array with extra query parameters to add to each request. array( param => value )
2444          * @return string html <script> and <style> tags
2445          */
2446         protected function makeResourceLoaderLink( $modules, $only, $useESI = false, array $extraQuery = array() ) {
2447                 global $wgResourceLoaderUseESI, $wgResourceLoaderInlinePrivateModules;
2448
2449                 if ( !count( $modules ) ) {
2450                         return '';
2451                 }
2452
2453                 if ( count( $modules ) > 1 ) {
2454                         // Remove duplicate module requests
2455                         $modules = array_unique( (array) $modules );
2456                         // Sort module names so requests are more uniform
2457                         sort( $modules );
2458
2459                         if ( ResourceLoader::inDebugMode() ) {
2460                                 // Recursively call us for every item
2461                                 $links = '';
2462                                 foreach ( $modules as $name ) {
2463                                         $links .= $this->makeResourceLoaderLink( $name, $only, $useESI );
2464                                 }
2465                                 return $links;
2466                         }
2467                 }
2468
2469                 // Create keyed-by-group list of module objects from modules list
2470                 $groups = array();
2471                 $resourceLoader = $this->getResourceLoader();
2472                 foreach ( (array) $modules as $name ) {
2473                         $module = $resourceLoader->getModule( $name );
2474                         # Check that we're allowed to include this module on this page
2475                         if ( !$module
2476                                 || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_SCRIPTS )
2477                                         && $only == ResourceLoaderModule::TYPE_SCRIPTS )
2478                                 || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_STYLES )
2479                                         && $only == ResourceLoaderModule::TYPE_STYLES )
2480                                 )
2481                         {
2482                                 continue;
2483                         }
2484
2485                         $group = $module->getGroup();
2486                         if ( !isset( $groups[$group] ) ) {
2487                                 $groups[$group] = array();
2488                         }
2489                         $groups[$group][$name] = $module;
2490                 }
2491
2492                 $links = '';
2493                 foreach ( $groups as $group => $modules ) {
2494                         // Special handling for user-specific groups
2495                         $user = null;
2496                         if ( ( $group === 'user' || $group === 'private' ) && $this->getUser()->isLoggedIn() ) {
2497                                 $user = $this->getUser()->getName();
2498                         }
2499
2500                         // Create a fake request based on the one we are about to make so modules return
2501                         // correct timestamp and emptiness data
2502                         $query = ResourceLoader::makeLoaderQuery(
2503                                 array(), // modules; not determined yet
2504                                 $this->getLanguage()->getCode(),
2505                                 $this->getSkin()->getSkinName(),
2506                                 $user,
2507                                 null, // version; not determined yet
2508                                 ResourceLoader::inDebugMode(),
2509                                 $only === ResourceLoaderModule::TYPE_COMBINED ? null : $only,
2510                                 $this->isPrintable(),
2511                                 $this->getRequest()->getBool( 'handheld' ),
2512                                 $extraQuery
2513                         );
2514                         $context = new ResourceLoaderContext( $resourceLoader, new FauxRequest( $query ) );
2515                         // Drop modules that know they're empty
2516                         foreach ( $modules as $key => $module ) {
2517                                 if ( $module->isKnownEmpty( $context ) ) {
2518                                         unset( $modules[$key] );
2519                                 }
2520                         }
2521                         // If there are no modules left, skip this group
2522                         if ( $modules === array() ) {
2523                                 continue;
2524                         }
2525
2526                         // Support inlining of private modules if configured as such
2527                         if ( $group === 'private' && $wgResourceLoaderInlinePrivateModules ) {
2528                                 if ( $only == ResourceLoaderModule::TYPE_STYLES ) {
2529                                         $links .= Html::inlineStyle(
2530                                                 $resourceLoader->makeModuleResponse( $context, $modules )
2531                                         );
2532                                 } else {
2533                                         $links .= Html::inlineScript(
2534                                                 ResourceLoader::makeLoaderConditionalScript(
2535                                                         $resourceLoader->makeModuleResponse( $context, $modules )
2536                                                 )
2537                                         );
2538                                 }
2539                                 $links .= "\n";
2540                                 continue;
2541                         }
2542                         // Special handling for the user group; because users might change their stuff
2543                         // on-wiki like user pages, or user preferences; we need to find the highest
2544                         // timestamp of these user-changable modules so we can ensure cache misses on change
2545                         // This should NOT be done for the site group (bug 27564) because anons get that too
2546                         // and we shouldn't be putting timestamps in Squid-cached HTML
2547                         $version = null;
2548                         if ( $group === 'user' ) {
2549                                 // Get the maximum timestamp
2550                                 $timestamp = 1;
2551                                 foreach ( $modules as $module ) {
2552                                         $timestamp = max( $timestamp, $module->getModifiedTime( $context ) );
2553                                 }
2554                                 // Add a version parameter so cache will break when things change
2555                                 $version = wfTimestamp( TS_ISO_8601_BASIC, $timestamp );
2556                         }
2557
2558                         $url = ResourceLoader::makeLoaderURL(
2559                                 array_keys( $modules ),
2560                                 $this->getLanguage()->getCode(),
2561                                 $this->getSkin()->getSkinName(),
2562                                 $user,
2563                                 $version,
2564                                 ResourceLoader::inDebugMode(),
2565                                 $only === ResourceLoaderModule::TYPE_COMBINED ? null : $only,
2566                                 $this->isPrintable(),
2567                                 $this->getRequest()->getBool( 'handheld' ),
2568                                 $extraQuery
2569                         );
2570                         if ( $useESI && $wgResourceLoaderUseESI ) {
2571                                 $esi = Xml::element( 'esi:include', array( 'src' => $url ) );
2572                                 if ( $only == ResourceLoaderModule::TYPE_STYLES ) {
2573                                         $link = Html::inlineStyle( $esi );
2574                                 } else {
2575                                         $link = Html::inlineScript( $esi );
2576                                 }
2577                         } else {
2578                                 // Automatically select style/script elements
2579                                 if ( $only === ResourceLoaderModule::TYPE_STYLES ) {
2580                                         $link = Html::linkedStyle( $url );
2581                                 } else {
2582                                         $link = Html::linkedScript( $url );
2583                                 }
2584                         }
2585
2586                         if( $group == 'noscript' ){
2587                                 $links .= Html::rawElement( 'noscript', array(), $link ) . "\n";
2588                         } else {
2589                                 $links .= $link . "\n";
2590                         }
2591                 }
2592                 return $links;
2593         }
2594
2595         /**
2596          * JS stuff to put in the <head>. This is the startup module, config
2597          * vars and modules marked with position 'top'
2598          *
2599          * @return String: HTML fragment
2600          */
2601         function getHeadScripts() {
2602                 // Startup - this will immediately load jquery and mediawiki modules
2603                 $scripts = $this->makeResourceLoaderLink( 'startup', ResourceLoaderModule::TYPE_SCRIPTS, true );
2604
2605                 // Load config before anything else
2606                 $scripts .= Html::inlineScript(
2607                         ResourceLoader::makeLoaderConditionalScript(
2608                                 ResourceLoader::makeConfigSetScript( $this->getJSVars() )
2609                         )
2610                 );
2611
2612                 // Script and Messages "only" requests marked for top inclusion
2613                 // Messages should go first
2614                 $scripts .= $this->makeResourceLoaderLink( $this->getModuleMessages( true, 'top' ), ResourceLoaderModule::TYPE_MESSAGES );
2615                 $scripts .= $this->makeResourceLoaderLink( $this->getModuleScripts( true, 'top' ), ResourceLoaderModule::TYPE_SCRIPTS );
2616
2617                 // Modules requests - let the client calculate dependencies and batch requests as it likes
2618                 // Only load modules that have marked themselves for loading at the top
2619                 $modules = $this->getModules( true, 'top' );
2620                 if ( $modules ) {
2621                         $scripts .= Html::inlineScript(
2622                                 ResourceLoader::makeLoaderConditionalScript(
2623                                         Xml::encodeJsCall( 'mw.loader.load', array( $modules ) )
2624                                 )
2625                         );
2626                 }
2627
2628                 return $scripts;
2629         }
2630
2631         /**
2632          * JS stuff to put at the bottom of the <body>: modules marked with position 'bottom',
2633          * legacy scripts ($this->mScripts), user preferences, site JS and user JS
2634          *
2635          * @return string
2636          */
2637         function getBottomScripts() {
2638                 global $wgUseSiteJs, $wgAllowUserJs;
2639
2640                 // Script and Messages "only" requests marked for bottom inclusion
2641                 // Messages should go first
2642                 $scripts = $this->makeResourceLoaderLink( $this->getModuleMessages( true, 'bottom' ), ResourceLoaderModule::TYPE_MESSAGES );
2643                 $scripts .= $this->makeResourceLoaderLink( $this->getModuleScripts( true, 'bottom' ), ResourceLoaderModule::TYPE_SCRIPTS );
2644
2645                 // Modules requests - let the client calculate dependencies and batch requests as it likes
2646                 // Only load modules that have marked themselves for loading at the bottom
2647                 $modules = $this->getModules( true, 'bottom' );
2648                 if ( $modules ) {
2649                         $scripts .= Html::inlineScript(
2650                                 ResourceLoader::makeLoaderConditionalScript(
2651                                         Xml::encodeJsCall( 'mw.loader.load', array( $modules ) )
2652                                 )
2653                         );
2654                 }
2655
2656                 // Legacy Scripts
2657                 $scripts .= "\n" . $this->mScripts;
2658
2659                 $userScripts = array( 'user.options', 'user.tokens' );
2660
2661                 // Add site JS if enabled
2662                 if ( $wgUseSiteJs ) {
2663                         $scripts .= $this->makeResourceLoaderLink( 'site', ResourceLoaderModule::TYPE_SCRIPTS );
2664                         if( $this->getUser()->isLoggedIn() ){
2665                                 $userScripts[] = 'user.groups';
2666                         }
2667                 }
2668
2669                 // Add user JS if enabled
2670                 if ( $wgAllowUserJs && $this->getUser()->isLoggedIn() ) {
2671                         if( $this->getTitle() && $this->getTitle()->isJsSubpage() && $this->userCanPreview() ) {
2672                                 # XXX: additional security check/prompt?
2673                                 // We're on a preview of a JS subpage
2674                                 // Exclude this page from the user module in case it's in there (bug 26283)
2675                                 $scripts .= $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_SCRIPTS, false,
2676                                         array( 'excludepage' => $this->getTitle()->getPrefixedDBkey() )
2677                                 );
2678                                 // Load the previewed JS
2679                                 $scripts .= Html::inlineScript( "\n" . $this->getRequest()->getText( 'wpTextbox1' ) . "\n" ) . "\n";
2680                         } else {
2681                                 // Include the user module normally
2682                                 // We can't do $userScripts[] = 'user'; because the user module would end up
2683                                 // being wrapped in a closure, so load it raw like 'site'
2684                                 $scripts .= $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_SCRIPTS );
2685                         }
2686                 }
2687                 $scripts .= $this->makeResourceLoaderLink( $userScripts, ResourceLoaderModule::TYPE_COMBINED );
2688
2689                 return $scripts;
2690         }
2691
2692         /**
2693          * Add one or more variables to be set in mw.config in JavaScript.
2694          *
2695          * @param $key {String|Array} Key or array of key/value pars.
2696          * @param $value {Mixed} Value of the configuration variable.
2697          */
2698         public function addJsConfigVars( $keys, $value ) {
2699                 if ( is_array( $keys ) ) {
2700                         foreach ( $keys as $key => $value ) {
2701                                 $this->mJsConfigVars[$key] = $value;
2702                         }
2703                         return;
2704                 }
2705
2706                 $this->mJsConfigVars[$keys] = $value;
2707         }
2708
2709
2710         /**
2711          * Get an array containing the variables to be set in mw.config in JavaScript.
2712          *
2713          * Do not add things here which can be evaluated in ResourceLoaderStartupScript
2714          * - in other words, page-independent/site-wide variables (without state).
2715          * You will only be adding bloat to the html page and causing page caches to
2716          * have to be purged on configuration changes.
2717          */
2718         protected function getJSVars() {
2719                 global $wgUseAjax, $wgEnableMWSuggest;
2720
2721                 $title = $this->getTitle();
2722                 $ns = $title->getNamespace();
2723                 $nsname = MWNamespace::exists( $ns ) ? MWNamespace::getCanonicalName( $ns ) : $title->getNsText();
2724                 if ( $ns == NS_SPECIAL ) {
2725                         list( $canonicalName, /*...*/ ) = SpecialPageFactory::resolveAlias( $title->getDBkey() );
2726                 } else {
2727                         $canonicalName = false; # bug 21115
2728                 }
2729
2730                 $vars = array(
2731                         'wgCanonicalNamespace' => $nsname,
2732                         'wgCanonicalSpecialPageName' => $canonicalName,
2733                         'wgNamespaceNumber' => $title->getNamespace(),
2734                         'wgPageName' => $title->getPrefixedDBKey(),
2735                         'wgTitle' => $title->getText(),
2736                         'wgCurRevisionId' => $title->getLatestRevID(),
2737                         'wgArticleId' => $title->getArticleId(),
2738                         'wgIsArticle' => $this->isArticle(),
2739                         'wgAction' => $this->getRequest()->getText( 'action', 'view' ),
2740                         'wgUserName' => $this->getUser()->isAnon() ? null : $this->getUser()->getName(),
2741                         'wgUserGroups' => $this->getUser()->getEffectiveGroups(),
2742                         'wgCategories' => $this->getCategories(),
2743                         'wgBreakFrames' => $this->getFrameOptions() == 'DENY',
2744                 );
2745                 $lang = $this->getTitle()->getPageLanguage();
2746                 if ( $lang->hasVariants() ) {
2747                         $vars['wgUserVariant'] = $lang->getPreferredVariant();
2748                 }
2749                 foreach ( $title->getRestrictionTypes() as $type ) {
2750                         $vars['wgRestriction' . ucfirst( $type )] = $title->getRestrictions( $type );
2751                 }
2752                 if ( $wgUseAjax && $wgEnableMWSuggest && !$this->getUser()->getOption( 'disablesuggest', false ) ) {
2753                         $vars['wgSearchNamespaces'] = SearchEngine::userNamespaces( $this->getUser() );
2754                 }
2755                 if ( $title->isMainPage() ) {
2756                         $vars['wgIsMainPage'] = true;
2757                 }
2758
2759                 // Allow extensions to add their custom variables to the mw.config map.
2760                 // Use the 'ResourceLoaderGetConfigVars' hook if the variable is not
2761                 // page-dependant but site-wide (without state).
2762                 // Alternatively, you may want to use OutputPage->addJsConfigVars() instead.
2763                 wfRunHooks( 'MakeGlobalVariablesScript', array( &$vars, $this ) );
2764
2765                 // Merge in variables from addJsConfigVars last
2766                 return array_merge( $vars, $this->mJsConfigVars );
2767         }
2768
2769         /**
2770          * To make it harder for someone to slip a user a fake
2771          * user-JavaScript or user-CSS preview, a random token
2772          * is associated with the login session. If it's not
2773          * passed back with the preview request, we won't render
2774          * the code.
2775          *
2776          * @return bool
2777          */
2778         public function userCanPreview() {
2779                 if ( $this->getRequest()->getVal( 'action' ) != 'submit'
2780                         || !$this->getRequest()->wasPosted()
2781                         || !$this->getUser()->matchEditToken(
2782                                 $this->getRequest()->getVal( 'wpEditToken' ) )
2783                 ) {
2784                         return false;
2785                 }
2786                 if ( !$this->getTitle()->isJsSubpage() && !$this->getTitle()->isCssSubpage() ) {
2787                         return false;
2788                 }
2789
2790                 return !count( $this->getTitle()->getUserPermissionsErrors( 'edit', $this->getUser() ) );
2791         }
2792
2793         /**
2794          * @param $unused Unused
2795          * @param $addContentType bool
2796          *
2797          * @return string HTML tag links to be put in the header.
2798          */
2799         public function getHeadLinks( $unused = null, $addContentType = false ) {
2800                 global $wgUniversalEditButton, $wgFavicon, $wgAppleTouchIcon, $wgEnableAPI,
2801                         $wgSitename, $wgVersion, $wgHtml5, $wgMimeType,
2802                         $wgFeed, $wgOverrideSiteFeed, $wgAdvertisedFeedTypes,
2803                         $wgDisableLangConversion, $wgCanonicalLanguageLinks,
2804                         $wgRightsPage, $wgRightsUrl;
2805
2806                 $tags = array();
2807
2808                 if ( $addContentType ) {
2809                         if ( $wgHtml5 ) {
2810                                 # More succinct than <meta http-equiv=Content-Type>, has the
2811                                 # same effect
2812                                 $tags[] = Html::element( 'meta', array( 'charset' => 'UTF-8' ) );
2813                         } else {
2814                                 $tags[] = Html::element( 'meta', array(
2815                                         'http-equiv' => 'Content-Type',
2816                                         'content' => "$wgMimeType; charset=UTF-8"
2817                                 ) );
2818                                 $tags[] = Html::element( 'meta', array(  // bug 15835
2819                                         'http-equiv' => 'Content-Style-Type',
2820                                         'content' => 'text/css'
2821                                 ) );
2822                         }
2823                 }
2824
2825                 $tags[] = Html::element( 'meta', array(
2826                         'name' => 'generator',
2827                         'content' => "MediaWiki $wgVersion",
2828                 ) );
2829
2830                 $p = "{$this->mIndexPolicy},{$this->mFollowPolicy}";
2831                 if( $p !== 'index,follow' ) {
2832                         // http://www.robotstxt.org/wc/meta-user.html
2833                         // Only show if it's different from the default robots policy
2834                         $tags[] = Html::element( 'meta', array(
2835                                 'name' => 'robots',
2836                                 'content' => $p,
2837                         ) );
2838                 }
2839
2840                 if ( count( $this->mKeywords ) > 0 ) {
2841                         $strip = array(
2842                                 "/<.*?" . ">/" => '',
2843                                 "/_/" => ' '
2844                         );
2845                         $tags[] = Html::element( 'meta', array(
2846                                 'name' => 'keywords',
2847                                 'content' =>  preg_replace(
2848                                         array_keys( $strip ),
2849                                         array_values( $strip ),
2850                                         implode( ',', $this->mKeywords )
2851                                 )
2852                         ) );
2853                 }
2854
2855                 foreach ( $this->mMetatags as $tag ) {
2856                         if ( 0 == strcasecmp( 'http:', substr( $tag[0], 0, 5 ) ) ) {
2857                                 $a = 'http-equiv';
2858                                 $tag[0] = substr( $tag[0], 5 );
2859                         } else {
2860                                 $a = 'name';
2861                         }
2862                         $tags[] = Html::element( 'meta',
2863                                 array(
2864                                         $a => $tag[0],
2865                                         'content' => $tag[1]
2866                                 )
2867                         );
2868                 }
2869
2870                 foreach ( $this->mLinktags as $tag ) {
2871                         $tags[] = Html::element( 'link', $tag );
2872                 }
2873
2874                 # Universal edit button
2875                 if ( $wgUniversalEditButton && $this->isArticleRelated() ) {
2876                         $user = $this->getUser();
2877                         if ( $this->getTitle()->quickUserCan( 'edit', $user )
2878                                 && ( $this->getTitle()->exists() || $this->getTitle()->quickUserCan( 'create', $user ) ) ) {
2879                                 // Original UniversalEditButton
2880                                 $msg = $this->msg( 'edit' )->text();
2881                                 $tags[] = Html::element( 'link', array(
2882                                         'rel' => 'alternate',
2883                                         'type' => 'application/x-wiki',
2884                                         'title' => $msg,
2885                                         'href' => $this->getTitle()->getLocalURL( 'action=edit' )
2886                                 ) );
2887                                 // Alternate edit link
2888                                 $tags[] = Html::element( 'link', array(
2889                                         'rel' => 'edit',
2890                                         'title' => $msg,
2891                                         'href' => $this->getTitle()->getLocalURL( 'action=edit' )
2892                                 ) );
2893                         }
2894                 }
2895
2896                 # Generally the order of the favicon and apple-touch-icon links
2897                 # should not matter, but Konqueror (3.5.9 at least) incorrectly
2898                 # uses whichever one appears later in the HTML source. Make sure
2899                 # apple-touch-icon is specified first to avoid this.
2900                 if ( $wgAppleTouchIcon !== false ) {
2901                         $tags[] = Html::element( 'link', array( 'rel' => 'apple-touch-icon', 'href' => $wgAppleTouchIcon ) );
2902                 }
2903
2904                 if ( $wgFavicon !== false ) {
2905                         $tags[] = Html::element( 'link', array( 'rel' => 'shortcut icon', 'href' => $wgFavicon ) );
2906                 }
2907
2908                 # OpenSearch description link
2909                 $tags[] = Html::element( 'link', array(
2910                         'rel' => 'search',
2911                         'type' => 'application/opensearchdescription+xml',
2912                         'href' => wfScript( 'opensearch_desc' ),
2913                         'title' => $this->msg( 'opensearch-desc' )->inContentLanguage()->text(),
2914                 ) );
2915
2916                 if ( $wgEnableAPI ) {
2917                         # Real Simple Discovery link, provides auto-discovery information
2918                         # for the MediaWiki API (and potentially additional custom API
2919                         # support such as WordPress or Twitter-compatible APIs for a
2920                         # blogging extension, etc)
2921                         $tags[] = Html::element( 'link', array(
2922                                 'rel' => 'EditURI',
2923                                 'type' => 'application/rsd+xml',
2924                                 // Output a protocol-relative URL here if $wgServer is protocol-relative
2925                                 // Whether RSD accepts relative or protocol-relative URLs is completely undocumented, though
2926                                 'href' => wfExpandUrl( wfAppendQuery( wfScript( 'api' ), array( 'action' => 'rsd' ) ), PROTO_RELATIVE ),
2927                         ) );
2928                 }
2929
2930
2931                 # Language variants
2932                 if ( !$wgDisableLangConversion && $wgCanonicalLanguageLinks ) {
2933                         $lang = $this->getTitle()->getPageLanguage();
2934                         if ( $lang->hasVariants() ) {
2935
2936                                 $urlvar = $lang->getURLVariant();
2937
2938                                 if ( !$urlvar ) {
2939                                         $variants = $lang->getVariants();
2940                                         foreach ( $variants as $_v ) {
2941                                                 $tags[] = Html::element( 'link', array(
2942                                                         'rel' => 'alternate',
2943                                                         'hreflang' => $_v,
2944                                                         'href' => $this->getTitle()->getLocalURL( '', $_v ) )
2945                                                 );
2946                                         }
2947                                 } else {
2948                                         $tags[] = Html::element( 'link', array(
2949                                                 'rel' => 'canonical',
2950                                                 'href' => $this->getTitle()->getCanonicalUrl()
2951                                         ) );
2952                                 }
2953                         }
2954                 }
2955
2956                 # Copyright
2957                 $copyright = '';
2958                 if ( $wgRightsPage ) {
2959                         $copy = Title::newFromText( $wgRightsPage );
2960
2961                         if ( $copy ) {
2962                                 $copyright = $copy->getLocalURL();
2963                         }
2964                 }
2965
2966                 if ( !$copyright && $wgRightsUrl ) {
2967                         $copyright = $wgRightsUrl;
2968                 }
2969
2970                 if ( $copyright ) {
2971                         $tags[] = Html::element( 'link', array(
2972                                 'rel' => 'copyright',
2973                                 'href' => $copyright )
2974                         );
2975                 }
2976
2977                 # Feeds
2978                 if ( $wgFeed ) {
2979                         foreach( $this->getSyndicationLinks() as $format => $link ) {
2980                                 # Use the page name for the title.  In principle, this could
2981                                 # lead to issues with having the same name for different feeds
2982                                 # corresponding to the same page, but we can't avoid that at
2983                                 # this low a level.
2984
2985                                 $tags[] = $this->feedLink(
2986                                         $format,
2987                                         $link,
2988                                         # Used messages: 'page-rss-feed' and 'page-atom-feed' (for an easier grep)
2989                                         $this->msg( "page-{$format}-feed", $this->getTitle()->getPrefixedText() )->text()
2990                                 );
2991                         }
2992
2993                         # Recent changes feed should appear on every page (except recentchanges,
2994                         # that would be redundant). Put it after the per-page feed to avoid
2995                         # changing existing behavior. It's still available, probably via a
2996                         # menu in your browser. Some sites might have a different feed they'd
2997                         # like to promote instead of the RC feed (maybe like a "Recent New Articles"
2998                         # or "Breaking news" one). For this, we see if $wgOverrideSiteFeed is defined.
2999                         # If so, use it instead.
3000                         if ( $wgOverrideSiteFeed ) {
3001                                 foreach ( $wgOverrideSiteFeed as $type => $feedUrl ) {
3002                                         // Note, this->feedLink escapes the url.
3003                                         $tags[] = $this->feedLink(
3004                                                 $type,
3005                                                 $feedUrl,
3006                                                 $this->msg( "site-{$type}-feed", $wgSitename )->text()
3007                                         );
3008                                 }
3009                         } elseif ( !$this->getTitle()->isSpecial( 'Recentchanges' ) ) {
3010                                 foreach ( $wgAdvertisedFeedTypes as $format ) {
3011                                         $tags[] = $this->feedLink(
3012                                                 $format,
3013                                                 $this->getTitle()->getLocalURL( "feed={$format}" ),
3014                                                 $this->msg( "site-{$format}-feed", $wgSitename )->text() # For grep: 'site-rss-feed', 'site-atom-feed'.
3015                                         );
3016                                 }
3017                         }
3018                 }
3019                 return implode( "\n", $tags );
3020         }
3021
3022         /**
3023          * Generate a <link rel/> for a feed.
3024          *
3025          * @param $type String: feed type
3026          * @param $url String: URL to the feed
3027          * @param $text String: value of the "title" attribute
3028          * @return String: HTML fragment
3029          */
3030         private function feedLink( $type, $url, $text ) {
3031                 return Html::element( 'link', array(
3032                         'rel' => 'alternate',
3033                         'type' => "application/$type+xml",
3034                         'title' => $text,
3035                         'href' => $url )
3036                 );
3037         }
3038
3039         /**
3040          * Add a local or specified stylesheet, with the given media options.
3041          * Meant primarily for internal use...
3042          *
3043          * @param $style String: URL to the file
3044          * @param $media String: to specify a media type, 'screen', 'printable', 'handheld' or any.
3045          * @param $condition String: for IE conditional comments, specifying an IE version
3046          * @param $dir String: set to 'rtl' or 'ltr' for direction-specific sheets
3047          */
3048         public function addStyle( $style, $media = '', $condition = '', $dir = '' ) {
3049                 $options = array();
3050                 // Even though we expect the media type to be lowercase, but here we
3051                 // force it to lowercase to be safe.
3052                 if( $media ) {
3053                         $options['media'] = $media;
3054                 }
3055                 if( $condition ) {
3056                         $options['condition'] = $condition;
3057                 }
3058                 if( $dir ) {
3059                         $options['dir'] = $dir;
3060                 }
3061                 $this->styles[$style] = $options;
3062         }
3063
3064         /**
3065          * Adds inline CSS styles
3066          * @param $style_css Mixed: inline CSS
3067          * @param $flip String: Set to 'flip' to flip the CSS if needed
3068          */
3069         public function addInlineStyle( $style_css, $flip = 'noflip' ) {
3070                 if( $flip === 'flip' && $this->getLanguage()->isRTL() ) {
3071                         # If wanted, and the interface is right-to-left, flip the CSS
3072                         $style_css = CSSJanus::transform( $style_css, true, false );
3073                 }
3074                 $this->mInlineStyles .= Html::inlineStyle( $style_css );
3075         }
3076
3077         /**
3078          * Build a set of <link>s for the stylesheets specified in the $this->styles array.
3079          * These will be applied to various media & IE conditionals.
3080          *
3081          * @return string
3082          */
3083         public function buildCssLinks() {
3084                 global $wgUseSiteCss, $wgAllowUserCss, $wgAllowUserCssPrefs;
3085
3086                 $this->getSkin()->setupSkinUserCss( $this );
3087
3088                 // Add ResourceLoader styles
3089                 // Split the styles into four groups
3090                 $styles = array( 'other' => array(), 'user' => array(), 'site' => array(), 'private' => array(), 'noscript' => array() );
3091                 $otherTags = ''; // Tags to append after the normal <link> tags
3092                 $resourceLoader = $this->getResourceLoader();
3093
3094                 $moduleStyles = $this->getModuleStyles();
3095
3096                 // Per-site custom styles
3097                 if ( $wgUseSiteCss ) {
3098                         $moduleStyles[] = 'site';
3099                         $moduleStyles[] = 'noscript';
3100                         if( $this->getUser()->isLoggedIn() ){
3101                                 $moduleStyles[] = 'user.groups';
3102                         }
3103                 }
3104
3105                 // Per-user custom styles
3106                 if ( $wgAllowUserCss ) {
3107                         if ( $this->getTitle()->isCssSubpage() && $this->userCanPreview() ) {
3108                                 // We're on a preview of a CSS subpage
3109                                 // Exclude this page from the user module in case it's in there (bug 26283)
3110                                 $otherTags .= $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_STYLES, false,
3111                                         array( 'excludepage' => $this->getTitle()->getPrefixedDBkey() )
3112                                 );
3113                                 // Load the previewed CSS
3114                                 $otherTags .= Html::inlineStyle( $this->getRequest()->getText( 'wpTextbox1' ) );
3115                         } else {
3116                                 // Load the user styles normally
3117                                 $moduleStyles[] = 'user';
3118                         }
3119                 }
3120
3121                 // Per-user preference styles
3122                 if ( $wgAllowUserCssPrefs ) {
3123                         $moduleStyles[] = 'user.options';
3124                 }
3125
3126                 foreach ( $moduleStyles as $name ) {
3127                         $module = $resourceLoader->getModule( $name );
3128                         if ( !$module ) {
3129                                 continue;
3130                         }
3131                         $group = $module->getGroup();
3132                         // Modules in groups named "other" or anything different than "user", "site" or "private"
3133                         // will be placed in the "other" group
3134                         $styles[isset( $styles[$group] ) ? $group : 'other'][] = $name;
3135                 }
3136
3137                 // We want site, private and user styles to override dynamically added styles from modules, but we want
3138                 // dynamically added styles to override statically added styles from other modules. So the order
3139                 // has to be other, dynamic, site, private, user
3140                 // Add statically added styles for other modules
3141                 $ret = $this->makeResourceLoaderLink( $styles['other'], ResourceLoaderModule::TYPE_STYLES );
3142                 // Add normal styles added through addStyle()/addInlineStyle() here
3143                 $ret .= implode( "\n", $this->buildCssLinksArray() ) . $this->mInlineStyles;
3144                 // Add marker tag to mark the place where the client-side loader should inject dynamic styles
3145                 // We use a <meta> tag with a made-up name for this because that's valid HTML
3146                 $ret .= Html::element( 'meta', array( 'name' => 'ResourceLoaderDynamicStyles', 'content' => '' ) ) . "\n";
3147
3148                 // Add site, private and user styles
3149                 // 'private' at present only contains user.options, so put that before 'user'
3150                 // Any future private modules will likely have a similar user-specific character
3151                 foreach ( array( 'site', 'noscript', 'private', 'user' ) as $group ) {
3152                         $ret .= $this->makeResourceLoaderLink( $styles[$group],
3153                                         ResourceLoaderModule::TYPE_STYLES
3154                         );
3155                 }
3156
3157                 // Add stuff in $otherTags (previewed user CSS if applicable)
3158                 $ret .= $otherTags;
3159                 return $ret;
3160         }
3161
3162         /**
3163          * @return Array
3164          */
3165         public function buildCssLinksArray() {
3166                 $links = array();
3167
3168                 // Add any extension CSS
3169                 foreach ( $this->mExtStyles as $url ) {
3170                         $this->addStyle( $url );
3171                 }
3172                 $this->mExtStyles = array();
3173
3174                 foreach( $this->styles as $file => $options ) {
3175                         $link = $this->styleLink( $file, $options );
3176                         if( $link ) {
3177                                 $links[$file] = $link;
3178                         }
3179                 }
3180                 return $links;
3181         }
3182
3183         /**
3184          * Generate \<link\> tags for stylesheets
3185          *
3186          * @param $style String: URL to the file
3187          * @param $options Array: option, can contain 'condition', 'dir', 'media'
3188          *                 keys
3189          * @return String: HTML fragment
3190          */
3191         protected function styleLink( $style, $options ) {
3192                 if( isset( $options['dir'] ) ) {
3193                         if( $this->getLanguage()->getDir() != $options['dir'] ) {
3194                                 return '';
3195                         }
3196                 }
3197
3198                 if( isset( $options['media'] ) ) {
3199                         $media = self::transformCssMedia( $options['media'] );
3200                         if( is_null( $media ) ) {
3201                                 return '';
3202                         }
3203                 } else {
3204                         $media = 'all';
3205                 }
3206
3207                 if( substr( $style, 0, 1 ) == '/' ||
3208                         substr( $style, 0, 5 ) == 'http:' ||
3209                         substr( $style, 0, 6 ) == 'https:' ) {
3210                         $url = $style;
3211                 } else {
3212                         global $wgStylePath, $wgStyleVersion;
3213                         $url = $wgStylePath . '/' . $style . '?' . $wgStyleVersion;
3214                 }
3215
3216                 $link = Html::linkedStyle( $url, $media );
3217
3218                 if( isset( $options['condition'] ) ) {
3219                         $condition = htmlspecialchars( $options['condition'] );
3220                         $link = "<!--[if $condition]>$link<![endif]-->";
3221                 }
3222                 return $link;
3223         }
3224
3225         /**
3226          * Transform "media" attribute based on request parameters
3227          *
3228          * @param $media String: current value of the "media" attribute
3229          * @return String: modified value of the "media" attribute
3230          */
3231         public static function transformCssMedia( $media ) {
3232                 global $wgRequest, $wgHandheldForIPhone;
3233
3234                 // Switch in on-screen display for media testing
3235                 $switches = array(
3236                         'printable' => 'print',
3237                         'handheld' => 'handheld',
3238                 );
3239                 foreach( $switches as $switch => $targetMedia ) {
3240                         if( $wgRequest->getBool( $switch ) ) {
3241                                 if( $media == $targetMedia ) {
3242                                         $media = '';
3243                                 } elseif( $media == 'screen' ) {
3244                                         return null;
3245                                 }
3246                         }
3247                 }
3248
3249                 // Expand longer media queries as iPhone doesn't grok 'handheld'
3250                 if( $wgHandheldForIPhone ) {
3251                         $mediaAliases = array(
3252                                 'screen' => 'screen and (min-device-width: 481px)',
3253                                 'handheld' => 'handheld, only screen and (max-device-width: 480px)',
3254                         );
3255
3256                         if( isset( $mediaAliases[$media] ) ) {
3257                                 $media = $mediaAliases[$media];
3258                         }
3259                 }
3260
3261                 return $media;
3262         }
3263
3264         /**
3265          * Add a wikitext-formatted message to the output.
3266          * This is equivalent to:
3267          *
3268          *    $wgOut->addWikiText( wfMsgNoTrans( ... ) )
3269          */
3270         public function addWikiMsg( /*...*/ ) {
3271                 $args = func_get_args();
3272                 $name = array_shift( $args );
3273                 $this->addWikiMsgArray( $name, $args );
3274         }
3275
3276         /**
3277          * Add a wikitext-formatted message to the output.
3278          * Like addWikiMsg() except the parameters are taken as an array
3279          * instead of a variable argument list.
3280          *
3281          * @param $name string
3282          * @param $args array
3283          */
3284         public function addWikiMsgArray( $name, $args ) {
3285                 $this->addWikiText( $this->msg( $name, $args )->plain() );
3286         }
3287
3288         /**
3289          * This function takes a number of message/argument specifications, wraps them in
3290          * some overall structure, and then parses the result and adds it to the output.
3291          *
3292          * In the $wrap, $1 is replaced with the first message, $2 with the second, and so
3293          * on. The subsequent arguments may either be strings, in which case they are the
3294          * message names, or arrays, in which case the first element is the message name,
3295          * and subsequent elements are the parameters to that message.
3296          *
3297          * The special named parameter 'options' in a message specification array is passed
3298          * through to the $options parameter of wfMsgExt().
3299          *
3300          * Don't use this for messages that are not in users interface language.
3301          *
3302          * For example:
3303          *
3304          *    $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>", 'some-error' );
3305          *
3306          * Is equivalent to:
3307          *
3308          *    $wgOut->addWikiText( "<div class='error'>\n" . wfMsgNoTrans( 'some-error' ) . "\n</div>" );
3309          *
3310          * The newline after opening div is needed in some wikitext. See bug 19226.
3311          *
3312          * @param $wrap string
3313          */
3314         public function wrapWikiMsg( $wrap /*, ...*/ ) {
3315                 $msgSpecs = func_get_args();
3316                 array_shift( $msgSpecs );
3317                 $msgSpecs = array_values( $msgSpecs );
3318                 $s = $wrap;
3319                 foreach ( $msgSpecs as $n => $spec ) {
3320                         $options = array();
3321                         if ( is_array( $spec ) ) {
3322                                 $args = $spec;
3323                                 $name = array_shift( $args );
3324                                 if ( isset( $args['options'] ) ) {
3325                                         $options = $args['options'];
3326                                         unset( $args['options'] );
3327                                 }
3328                         }  else {
3329                                 $args = array();
3330                                 $name = $spec;
3331                         }
3332                         $s = str_replace( '$' . ( $n + 1 ), wfMsgExt( $name, $options, $args ), $s );
3333                 }
3334                 $this->addWikiText( $s );
3335         }
3336
3337         /**
3338          * Include jQuery core. Use this to avoid loading it multiple times
3339          * before we get a usable script loader.
3340          *
3341          * @param $modules Array: list of jQuery modules which should be loaded
3342          * @return Array: the list of modules which were not loaded.
3343          * @since 1.16
3344          * @deprecated since 1.17
3345          */
3346         public function includeJQuery( $modules = array() ) {
3347                 return array();
3348         }
3349
3350 }