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 class 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  * Another class (fixme) handle sending the whole page to the client.
  15  *
  16  * Some comments comes from a pairing session between Zak Greant and Ashar Voultoiz
  17  * in november 2010.
  18  *
  19  * @todo document
  20  */
  21 class OutputPage {
  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 outputted 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 = true;
  51
  52         /**
  53          * Should be private. We have to set isPrintable(). Some pages should
  54          * never be printed (ex: redirections).
  55          */
  56         var $mPrintable = false;
  57
  58         /**
  59          * Should be private. We have set/get/append methods.
  60          *
  61          * Contains the page subtitle. Special pages usually have some links here.
  62          * Don't confuse with site subtitle added by skins.
  63          */
  64         var $mSubtitle = '';
  65
  66         var $mRedirect = '';
  67         var $mStatusCode;
  68
  69         /**
  70          * mLastModified and mEtag are used for sending cache control.
  71          * The whole caching system should probably be moved in its own class.
  72          */
  73         var $mLastModified = '';
  74
  75         /**
  76          * Should be private. No getter but used in sendCacheControl();
  77          * Contains an HTTP Entity Tags (see RFC 2616 section 3.13) which is used
  78          * as a unique identifier for the content. It is later used by the client
  79          * to compare its cache version with the server version. Client sends
  80          * headers If-Match and If-None-Match containing its local cache ETAG value.
  81          *
  82          * To get more information, you will have to look at HTTP1/1 protocols which
  83          * is properly described in RFC 2616 : http://tools.ietf.org/html/rfc2616
  84          */
  85         var $mETag = false;
  86
  87         var $mCategoryLinks = array();
  88         var $mCategories = array();
  89
  90         /// Should be private. Array of Interwiki Prefixed (non DB key) Titles (e.g. 'fr:Test page')
  91         var $mLanguageLinks = array();
  92
  93         /**
  94          * Should be private. Used for JavaScript (pre resource loader)
  95          * We should split js / css.
  96          * mScripts content is inserted as is in <head> by Skin. This might contains
  97          * either a link to a stylesheet or inline css.
  98          */
  99         var $mScripts = '';
 100
 101         /**
 102          * Inline CSS styles. Use addInlineStyle() sparsingly
 103          */
 104         var $mInlineStyles = '';
 105
 106         //
 107         var $mLinkColours;
 108
 109         /**
 110          * Used by skin template.
 111          * Example: $tpl->set( 'displaytitle', $out->mPageLinkTitle );
 112          */
 113         var $mPageLinkTitle = '';
 114
 115         /// Array of elements in <head>. Parser might add its own headers!
 116         var $mHeadItems = array();
 117
 118         // Next variables probably comes from the resource loader @todo FIXME
 119         var $mModules = array(), $mModuleScripts = array(), $mModuleStyles = array(), $mModuleMessages = array();
 120         var $mResourceLoader;
 121
 122         /** @fixme is this still used ?*/
 123         var $mInlineMsg = array();
 124
 125         var $mTemplateIds = array();
 126
 127         # What level of 'untrustworthiness' is allowed in CSS/JS modules loaded on this page?
 128         # @see ResourceLoaderModule::$origin
 129         # ResourceLoaderModule::ORIGIN_ALL is assumed unless overridden;
 130         protected $mAllowedModules = array(
 131                 ResourceLoaderModule::TYPE_COMBINED => ResourceLoaderModule::ORIGIN_ALL,
 132         );
 133
 134         /**
 135          * @EasterEgg I just love the name for this self documenting variable.
 136          * @todo document
 137          */
 138         var $mDoNothing = false;
 139
 140         // Parser related.
 141         var $mContainsOldMagic = 0, $mContainsNewMagic = 0;
 142
 143         /**
 144          * Should be private. Has get/set methods properly documented.
 145          * Stores "article flag" toggle.
 146          */
 147         var $mIsArticleRelated = true;
 148
 149         /// lazy initialised, use parserOptions()
 150         protected $mParserOptions = null;
 151
 152         /**
 153          * Handles the atom / rss links.
 154          * We probably only support atom in 2011.
 155          * Looks like a private variable.
 156          * @see $wgAdvertisedFeedTypes
 157          */
 158         var $mFeedLinks = array();
 159
 160         // Gwicke work on squid caching? Roughly from 2003.
 161         var $mEnableClientCache = true;
 162
 163         /**
 164          * Flag if output should only contain the body of the article.
 165          * Should be private.
 166          */
 167         var $mArticleBodyOnly = false;
 168
 169         var $mNewSectionLink = false;
 170         var $mHideNewSectionLink = false;
 171
 172         /**
 173          * Comes from the parser. This was probably made to load CSS/JS only
 174          * if we had <gallery>. Used directly in CategoryPage.php
 175          * Looks like resource loader can replace this.
 176          */
 177         var $mNoGallery = false;
 178
 179         // should be private.
 180         var $mPageTitleActionText = '';
 181         var $mParseWarnings = array();
 182
 183         // Cache stuff. Looks like mEnableClientCache
 184         var $mSquidMaxage = 0;
 185
 186         // @todo document
 187         var $mPreventClickjacking = true;
 188
 189         /// should be private. To include the variable {{REVISIONID}}
 190         var $mRevisionId = null;
 191
 192         /// Stores a Title object (of the current page).
 193         protected $mTitle = null;
 194
 195         /**
 196          * An array of stylesheet filenames (relative from skins path), with options
 197          * for CSS media, IE conditions, and RTL/LTR direction.
 198          * For internal use; add settings in the skin via $this->addStyle()
 199          *
 200          * Style again! This seems like a code duplication since we already have
 201          * mStyles. This is what makes OpenSource amazing.
 202          */
 203         var $styles = array();
 204
 205         /**
 206          * Whether jQuery is already handled.
 207          */
 208         protected $mJQueryDone = false;
 209
 210         private $mIndexPolicy = 'index';
 211         private $mFollowPolicy = 'follow';
 212         private $mVaryHeader = array(
 213                 'Accept-Encoding' => array( 'list-contains=gzip' ),
 214                 'Cookie' => null
 215         );
 216
 217         /**
 218          * Redirect to $url rather than displaying the normal page
 219          *
 220          * @param $url String: URL
 221          * @param $responsecode String: HTTP status code
 222          */
 223         public function redirect( $url, $responsecode = '302' ) {
 224                 # Strip newlines as a paranoia check for header injection in PHP<5.1.2
 225                 $this->mRedirect = str_replace( "\n", '', $url );
 226                 $this->mRedirectCode = $responsecode;
 227         }
 228
 229         /**
 230          * Get the URL to redirect to, or an empty string if not redirect URL set
 231          *
 232          * @return String
 233          */
 234         public function getRedirect() {
 235                 return $this->mRedirect;
 236         }
 237
 238         /**
 239          * Set the HTTP status code to send with the output.
 240          *
 241          * @param $statusCode Integer
 242          */
 243         public function setStatusCode( $statusCode ) {
 244                 $this->mStatusCode = $statusCode;
 245         }
 246
 247         /**
 248          * Add a new <meta> tag
 249          * To add an http-equiv meta tag, precede the name with "http:"
 250          *
 251          * @param $name String tag name
 252          * @param $val String tag value
 253          */
 254         function addMeta( $name, $val ) {
 255                 array_push( $this->mMetatags, array( $name, $val ) );
 256         }
 257
 258         /**
 259          * Add a keyword or a list of keywords in the page header
 260          *
 261          * @param $text String or array of strings
 262          */
 263         function addKeyword( $text ) {
 264                 if( is_array( $text ) ) {
 265                         $this->mKeywords = array_merge( $this->mKeywords, $text );
 266                 } else {
 267                         array_push( $this->mKeywords, $text );
 268                 }
 269         }
 270
 271         /**
 272          * Add a new \<link\> tag to the page header
 273          *
 274          * @param $linkarr Array: associative array of attributes.
 275          */
 276         function addLink( $linkarr ) {
 277                 array_push( $this->mLinktags, $linkarr );
 278         }
 279
 280         /**
 281          * Add a new \<link\> with "rel" attribute set to "meta"
 282          *
 283          * @param $linkarr Array: associative array mapping attribute names to their
 284          *                 values, both keys and values will be escaped, and the
 285          *                 "rel" attribute will be automatically added
 286          */
 287         function addMetadataLink( $linkarr ) {
 288                 # note: buggy CC software only reads first "meta" link
 289                 static $haveMeta = false;
 290                 $linkarr['rel'] = $haveMeta ? 'alternate meta' : 'meta';
 291                 $this->addLink( $linkarr );
 292                 $haveMeta = true;
 293         }
 294
 295         /**
 296          * Add raw HTML to the list of scripts (including \<script\> tag, etc.)
 297          *
 298          * @param $script String: raw HTML
 299          */
 300         function addScript( $script ) {
 301                 $this->mScripts .= $script . "\n";
 302         }
 303
 304         /**
 305          * Register and add a stylesheet from an extension directory.
 306          *
 307          * @param $url String path to sheet.  Provide either a full url (beginning
 308          *             with 'http', etc) or a relative path from the document root
 309          *             (beginning with '/').  Otherwise it behaves identically to
 310          *             addStyle() and draws from the /skins folder.
 311          */
 312         public function addExtensionStyle( $url ) {
 313                 array_push( $this->mExtStyles, $url );
 314         }
 315
 316         /**
 317          * Get all styles added by extensions
 318          *
 319          * @return Array
 320          */
 321         function getExtStyle() {
 322                 return $this->mExtStyles;
 323         }
 324
 325         /**
 326          * Add a JavaScript file out of skins/common, or a given relative path.
 327          *
 328          * @param $file String: filename in skins/common or complete on-server path
 329          *              (/foo/bar.js)
 330          * @param $version String: style version of the file. Defaults to $wgStyleVersion
 331          */
 332         public function addScriptFile( $file, $version = null ) {
 333                 global $wgStylePath, $wgStyleVersion;
 334                 // See if $file parameter is an absolute URL or begins with a slash
 335                 if( substr( $file, 0, 1 ) == '/' || preg_match( '#^[a-z]*://#i', $file ) ) {
 336                         $path = $file;
 337                 } else {
 338                         $path = "{$wgStylePath}/common/{$file}";
 339                 }
 340                 if ( is_null( $version ) )
 341                         $version = $wgStyleVersion;
 342                 $this->addScript( Html::linkedScript( wfAppendQuery( $path, $version ) ) );
 343         }
 344
 345         /**
 346          * Add a self-contained script tag with the given contents
 347          *
 348          * @param $script String: JavaScript text, no <script> tags
 349          */
 350         public function addInlineScript( $script ) {
 351                 $this->mScripts .= Html::inlineScript( "\n$script\n" ) . "\n";
 352         }
 353
 354         /**
 355          * Get all registered JS and CSS tags for the header.
 356          *
 357          * @return String
 358          */
 359         function getScript() {
 360                 return $this->mScripts . $this->getHeadItems();
 361         }
 362
 363         /**
 364          * Filter an array of modules to remove insufficiently trustworthy members
 365          * @param $modules Array
 366          * @return Array
 367          */
 368         protected function filterModules( $modules, $type = ResourceLoaderModule::TYPE_COMBINED ){
 369                 $resourceLoader = $this->getResourceLoader();
 370                 $filteredModules = array();
 371                 foreach( $modules as $val ){
 372                         $module = $resourceLoader->getModule( $val );
 373                         if( $module->getOrigin() <= $this->getAllowedModules( $type ) ) {
 374                                 $filteredModules[] = $val;
 375                         }
 376                 }
 377                 return $filteredModules;
 378         }
 379
 380         /**
 381          * Get the list of modules to include on this page
 382          *
 383          * @param $filter Bool whether to filter out insufficiently trustworthy modules
 384          * @return Array of module names
 385          */
 386         public function getModules( $filter = false, $param = 'mModules' ) {
 387                 $modules = array_values( array_unique( $this->$param ) );
 388                 return $filter
 389                         ? $this->filterModules( $modules )
 390                         : $modules;
 391         }
 392
 393         /**
 394          * Add one or more modules recognized by the resource loader. Modules added
 395          * through this function will be loaded by the resource loader when the
 396          * page loads.
 397          *
 398          * @param $modules Mixed: module name (string) or array of module names
 399          */
 400         public function addModules( $modules ) {
 401                 $this->mModules = array_merge( $this->mModules, (array)$modules );
 402         }
 403
 404         /**
 405          * Get the list of module JS to include on this page
 406          * @return array of module names
 407          */
 408         public function getModuleScripts( $filter = false ) {
 409                 return $this->getModules( $filter, 'mModuleScripts' );
 410         }
 411
 412         /**
 413          * Add only JS of one or more modules recognized by the resource loader. Module
 414          * scripts added through this function will be loaded by the resource loader when
 415          * the page loads.
 416          *
 417          * @param $modules Mixed: module name (string) or array of module names
 418          */
 419         public function addModuleScripts( $modules ) {
 420                 $this->mModuleScripts = array_merge( $this->mModuleScripts, (array)$modules );
 421         }
 422
 423         /**
 424          * Get the list of module CSS to include on this page
 425          *
 426          * @return Array of module names
 427          */
 428         public function getModuleStyles( $filter = false ) {
 429                 return $this->getModules( $filter, 'mModuleStyles' );
 430         }
 431
 432         /**
 433          * Add only CSS of one or more modules recognized by the resource loader. Module
 434          * styles added through this function will be loaded by the resource loader when
 435          * the page loads.
 436          *
 437          * @param $modules Mixed: module name (string) or array of module names
 438          */
 439         public function addModuleStyles( $modules ) {
 440                 $this->mModuleStyles = array_merge( $this->mModuleStyles, (array)$modules );
 441         }
 442
 443         /**
 444          * Get the list of module messages to include on this page
 445          *
 446          * @return Array of module names
 447          */
 448         public function getModuleMessages( $filter = false ) {
 449                 return $this->getModules( $filter, 'mModuleMessages' );
 450         }
 451
 452         /**
 453          * Add only messages of one or more modules recognized by the resource loader.
 454          * Module messages added through this function will be loaded by the resource
 455          * loader when the page loads.
 456          *
 457          * @param $modules Mixed: module name (string) or array of module names
 458          */
 459         public function addModuleMessages( $modules ) {
 460                 $this->mModuleMessages = array_merge( $this->mModuleMessages, (array)$modules );
 461         }
 462
 463         /**
 464          * Get all header items in a string
 465          *
 466          * @return String
 467          */
 468         function getHeadItems() {
 469                 $s = '';
 470                 foreach ( $this->mHeadItems as $item ) {
 471                         $s .= $item;
 472                 }
 473                 return $s;
 474         }
 475
 476         /**
 477          * Add or replace an header item to the output
 478          *
 479          * @param $name String: item name
 480          * @param $value String: raw HTML
 481          */
 482         public function addHeadItem( $name, $value ) {
 483                 $this->mHeadItems[$name] = $value;
 484         }
 485
 486         /**
 487          * Check if the header item $name is already set
 488          *
 489          * @param $name String: item name
 490          * @return Boolean
 491          */
 492         public function hasHeadItem( $name ) {
 493                 return isset( $this->mHeadItems[$name] );
 494         }
 495
 496         /**
 497          * Set the value of the ETag HTTP header, only used if $wgUseETag is true
 498          *
 499          * @param $tag String: value of "ETag" header
 500          */
 501         function setETag( $tag ) {
 502                 $this->mETag = $tag;
 503         }
 504
 505         /**
 506          * Set whether the output should only contain the body of the article,
 507          * without any skin, sidebar, etc.
 508          * Used e.g. when calling with "action=render".
 509          *
 510          * @param $only Boolean: whether to output only the body of the article
 511          */
 512         public function setArticleBodyOnly( $only ) {
 513                 $this->mArticleBodyOnly = $only;
 514         }
 515
 516         /**
 517          * Return whether the output will contain only the body of the article
 518          *
 519          * @return Boolean
 520          */
 521         public function getArticleBodyOnly() {
 522                 return $this->mArticleBodyOnly;
 523         }
 524
 525         /**
 526          * checkLastModified tells the client to use the client-cached page if
 527          * possible. If sucessful, the OutputPage is disabled so that
 528          * any future call to OutputPage->output() have no effect.
 529          *
 530          * Side effect: sets mLastModified for Last-Modified header
 531          *
 532          * @return Boolean: true iff cache-ok headers was sent.
 533          */
 534         public function checkLastModified( $timestamp ) {
 535                 global $wgCachePages, $wgCacheEpoch, $wgUser, $wgRequest;
 536
 537                 if ( !$timestamp || $timestamp == '19700101000000' ) {
 538                         wfDebug( __METHOD__ . ": CACHE DISABLED, NO TIMESTAMP\n" );
 539                         return false;
 540                 }
 541                 if( !$wgCachePages ) {
 542                         wfDebug( __METHOD__ . ": CACHE DISABLED\n", false );
 543                         return false;
 544                 }
 545                 if( $wgUser->getOption( 'nocache' ) ) {
 546                         wfDebug( __METHOD__ . ": USER DISABLED CACHE\n", false );
 547                         return false;
 548                 }
 549
 550                 $timestamp = wfTimestamp( TS_MW, $timestamp );
 551                 $modifiedTimes = array(
 552                         'page' => $timestamp,
 553                         'user' => $wgUser->getTouched(),
 554                         'epoch' => $wgCacheEpoch
 555                 );
 556                 wfRunHooks( 'OutputPageCheckLastModified', array( &$modifiedTimes ) );
 557
 558                 $maxModified = max( $modifiedTimes );
 559                 $this->mLastModified = wfTimestamp( TS_RFC2822, $maxModified );
 560
 561                 if( empty( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) ) {
 562                         wfDebug( __METHOD__ . ": client did not send If-Modified-Since header\n", false );
 563                         return false;
 564                 }
 565
 566                 # Make debug info
 567                 $info = '';
 568                 foreach ( $modifiedTimes as $name => $value ) {
 569                         if ( $info !== '' ) {
 570                                 $info .= ', ';
 571                         }
 572                         $info .= "$name=" . wfTimestamp( TS_ISO_8601, $value );
 573                 }
 574
 575                 # IE sends sizes after the date like this:
 576                 # Wed, 20 Aug 2003 06:51:19 GMT; length=5202
 577                 # this breaks strtotime().
 578                 $clientHeader = preg_replace( '/;.*$/', '', $_SERVER["HTTP_IF_MODIFIED_SINCE"] );
 579
 580                 wfSuppressWarnings(); // E_STRICT system time bitching
 581                 $clientHeaderTime = strtotime( $clientHeader );
 582                 wfRestoreWarnings();
 583                 if ( !$clientHeaderTime ) {
 584                         wfDebug( __METHOD__ . ": unable to parse the client's If-Modified-Since header: $clientHeader\n" );
 585                         return false;
 586                 }
 587                 $clientHeaderTime = wfTimestamp( TS_MW, $clientHeaderTime );
 588
 589                 wfDebug( __METHOD__ . ": client sent If-Modified-Since: " .
 590                         wfTimestamp( TS_ISO_8601, $clientHeaderTime ) . "\n", false );
 591                 wfDebug( __METHOD__ . ": effective Last-Modified: " .
 592                         wfTimestamp( TS_ISO_8601, $maxModified ) . "\n", false );
 593                 if( $clientHeaderTime < $maxModified ) {
 594                         wfDebug( __METHOD__ . ": STALE, $info\n", false );
 595                         return false;
 596                 }
 597
 598                 # Not modified
 599                 # Give a 304 response code and disable body output
 600                 wfDebug( __METHOD__ . ": NOT MODIFIED, $info\n", false );
 601                 ini_set( 'zlib.output_compression', 0 );
 602                 $wgRequest->response()->header( "HTTP/1.1 304 Not Modified" );
 603                 $this->sendCacheControl();
 604                 $this->disable();
 605
 606                 // Don't output a compressed blob when using ob_gzhandler;
 607                 // it's technically against HTTP spec and seems to confuse
 608                 // Firefox when the response gets split over two packets.
 609                 wfClearOutputBuffers();
 610
 611                 return true;
 612         }
 613
 614         /**
 615          * Override the last modified timestamp
 616          *
 617          * @param $timestamp String: new timestamp, in a format readable by
 618          *        wfTimestamp()
 619          */
 620         public function setLastModified( $timestamp ) {
 621                 $this->mLastModified = wfTimestamp( TS_RFC2822, $timestamp );
 622         }
 623
 624         /**
 625          * Set the robot policy for the page: <http://www.robotstxt.org/meta.html>
 626          *
 627          * @param $policy String: the literal string to output as the contents of
 628          *   the meta tag.  Will be parsed according to the spec and output in
 629          *   standardized form.
 630          * @return null
 631          */
 632         public function setRobotPolicy( $policy ) {
 633                 $policy = Article::formatRobotPolicy( $policy );
 634
 635                 if( isset( $policy['index'] ) ) {
 636                         $this->setIndexPolicy( $policy['index'] );
 637                 }
 638                 if( isset( $policy['follow'] ) ) {
 639                         $this->setFollowPolicy( $policy['follow'] );
 640                 }
 641         }
 642
 643         /**
 644          * Set the index policy for the page, but leave the follow policy un-
 645          * touched.
 646          *
 647          * @param $policy string Either 'index' or 'noindex'.
 648          * @return null
 649          */
 650         public function setIndexPolicy( $policy ) {
 651                 $policy = trim( $policy );
 652                 if( in_array( $policy, array( 'index', 'noindex' ) ) ) {
 653                         $this->mIndexPolicy = $policy;
 654                 }
 655         }
 656
 657         /**
 658          * Set the follow policy for the page, but leave the index policy un-
 659          * touched.
 660          *
 661          * @param $policy String: either 'follow' or 'nofollow'.
 662          * @return null
 663          */
 664         public function setFollowPolicy( $policy ) {
 665                 $policy = trim( $policy );
 666                 if( in_array( $policy, array( 'follow', 'nofollow' ) ) ) {
 667                         $this->mFollowPolicy = $policy;
 668                 }
 669         }
 670
 671         /**
 672          * Set the new value of the "action text", this will be added to the
 673          * "HTML title", separated from it with " - ".
 674          *
 675          * @param $text String: new value of the "action text"
 676          */
 677         public function setPageTitleActionText( $text ) {
 678                 $this->mPageTitleActionText = $text;
 679         }
 680
 681         /**
 682          * Get the value of the "action text"
 683          *
 684          * @return String
 685          */
 686         public function getPageTitleActionText() {
 687                 if ( isset( $this->mPageTitleActionText ) ) {
 688                         return $this->mPageTitleActionText;
 689                 }
 690         }
 691
 692         /**
 693          * "HTML title" means the contents of <title>.
 694          * It is stored as plain, unescaped text and will be run through htmlspecialchars in the skin file.
 695          */
 696         public function setHTMLTitle( $name ) {
 697                 $this->mHTMLtitle = $name;
 698         }
 699
 700         /**
 701          * Return the "HTML title", i.e. the content of the <title> tag.
 702          *
 703          * @return String
 704          */
 705         public function getHTMLTitle() {
 706                 return $this->mHTMLtitle;
 707         }
 708
 709         /**
 710          * "Page title" means the contents of \<h1\>. It is stored as a valid HTML fragment.
 711          * This function allows good tags like \<sup\> in the \<h1\> tag, but not bad tags like \<script\>.
 712          * This function automatically sets \<title\> to the same content as \<h1\> but with all tags removed.
 713          * Bad tags that were escaped in \<h1\> will still be escaped in \<title\>, and good tags like \<i\> will be dropped entirely.
 714          */
 715         public function setPageTitle( $name ) {
 716                 # change "<script>foo&bar</script>" to "&lt;script&gt;foo&amp;bar&lt;/script&gt;"
 717                 # but leave "<i>foobar</i>" alone
 718                 $nameWithTags = Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags( $name ) );
 719                 $this->mPagetitle = $nameWithTags;
 720
 721                 # change "<i>foo&amp;bar</i>" to "foo&bar"
 722                 $this->setHTMLTitle( wfMsg( 'pagetitle', Sanitizer::stripAllTags( $nameWithTags ) ) );
 723         }
 724
 725         /**
 726          * Return the "page title", i.e. the content of the \<h1\> tag.
 727          *
 728          * @return String
 729          */
 730         public function getPageTitle() {
 731                 return $this->mPagetitle;
 732         }
 733
 734         /**
 735          * Set the Title object to use
 736          *
 737          * @param $t Title object
 738          */
 739         public function setTitle( $t ) {
 740                 $this->mTitle = $t;
 741         }
 742
 743         /**
 744          * Get the Title object used in this instance
 745          *
 746          * @return Title
 747          */
 748         public function getTitle() {
 749                 if ( $this->mTitle instanceof Title ) {
 750                         return $this->mTitle;
 751                 } else {
 752                         wfDebug( __METHOD__ . " called and \$mTitle is null. Return \$wgTitle for sanity\n" );
 753                         global $wgTitle;
 754                         return $wgTitle;
 755                 }
 756         }
 757
 758         /**
 759          * Replace the subtile with $str
 760          *
 761          * @param $str String: new value of the subtitle
 762          */
 763         public function setSubtitle( $str ) {
 764                 $this->mSubtitle = /*$this->parse(*/ $str /*)*/; // @bug 2514
 765         }
 766
 767         /**
 768          * Add $str to the subtitle
 769          *
 770          * @param $str String to add to the subtitle
 771          */
 772         public function appendSubtitle( $str ) {
 773                 $this->mSubtitle .= /*$this->parse(*/ $str /*)*/; // @bug 2514
 774         }
 775
 776         /**
 777          * Get the subtitle
 778          *
 779          * @return String
 780          */
 781         public function getSubtitle() {
 782                 return $this->mSubtitle;
 783         }
 784
 785         /**
 786          * Set the page as printable, i.e. it'll be displayed with with all
 787          * print styles included
 788          */
 789         public function setPrintable() {
 790                 $this->mPrintable = true;
 791         }
 792
 793         /**
 794          * Return whether the page is "printable"
 795          *
 796          * @return Boolean
 797          */
 798         public function isPrintable() {
 799                 return $this->mPrintable;
 800         }
 801
 802         /**
 803          * Disable output completely, i.e. calling output() will have no effect
 804          */
 805         public function disable() {
 806                 $this->mDoNothing = true;
 807         }
 808
 809         /**
 810          * Return whether the output will be completely disabled
 811          *
 812          * @return Boolean
 813          */
 814         public function isDisabled() {
 815                 return $this->mDoNothing;
 816         }
 817
 818         /**
 819          * Show an "add new section" link?
 820          *
 821          * @return Boolean
 822          */
 823         public function showNewSectionLink() {
 824                 return $this->mNewSectionLink;
 825         }
 826
 827         /**
 828          * Forcibly hide the new section link?
 829          *
 830          * @return Boolean
 831          */
 832         public function forceHideNewSectionLink() {
 833                 return $this->mHideNewSectionLink;
 834         }
 835
 836         /**
 837          * Add or remove feed links in the page header
 838          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
 839          * for the new version
 840          * @see addFeedLink()
 841          *
 842          * @param $show Boolean: true: add default feeds, false: remove all feeds
 843          */
 844         public function setSyndicated( $show = true ) {
 845                 if ( $show ) {
 846                         $this->setFeedAppendQuery( false );
 847                 } else {
 848                         $this->mFeedLinks = array();
 849                 }
 850         }
 851
 852         /**
 853          * Add default feeds to the page header
 854          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
 855          * for the new version
 856          * @see addFeedLink()
 857          *
 858          * @param $val String: query to append to feed links or false to output
 859          *        default links
 860          */
 861         public function setFeedAppendQuery( $val ) {
 862                 global $wgAdvertisedFeedTypes;
 863
 864                 $this->mFeedLinks = array();
 865
 866                 foreach ( $wgAdvertisedFeedTypes as $type ) {
 867                         $query = "feed=$type";
 868                         if ( is_string( $val ) ) {
 869                                 $query .= '&' . $val;
 870                         }
 871                         $this->mFeedLinks[$type] = $this->getTitle()->getLocalURL( $query );
 872                 }
 873         }
 874
 875         /**
 876          * Add a feed link to the page header
 877          *
 878          * @param $format String: feed type, should be a key of $wgFeedClasses
 879          * @param $href String: URL
 880          */
 881         public function addFeedLink( $format, $href ) {
 882                 global $wgAdvertisedFeedTypes;
 883
 884                 if ( in_array( $format, $wgAdvertisedFeedTypes ) ) {
 885                         $this->mFeedLinks[$format] = $href;
 886                 }
 887         }
 888
 889         /**
 890          * Should we output feed links for this page?
 891          * @return Boolean
 892          */
 893         public function isSyndicated() {
 894                 return count( $this->mFeedLinks ) > 0;
 895         }
 896
 897         /**
 898          * Return URLs for each supported syndication format for this page.
 899          * @return array associating format keys with URLs
 900          */
 901         public function getSyndicationLinks() {
 902                 return $this->mFeedLinks;
 903         }
 904
 905         /**
 906          * Will currently always return null
 907          *
 908          * @return null
 909          */
 910         public function getFeedAppendQuery() {
 911                 return $this->mFeedLinksAppendQuery;
 912         }
 913
 914         /**
 915          * Set whether the displayed content is related to the source of the
 916          * corresponding article on the wiki
 917          * Setting true will cause the change "article related" toggle to true
 918          *
 919          * @param $v Boolean
 920          */
 921         public function setArticleFlag( $v ) {
 922                 $this->mIsarticle = $v;
 923                 if ( $v ) {
 924                         $this->mIsArticleRelated = $v;
 925                 }
 926         }
 927
 928         /**
 929          * Return whether the content displayed page is related to the source of
 930          * the corresponding article on the wiki
 931          *
 932          * @return Boolean
 933          */
 934         public function isArticle() {
 935                 return $this->mIsarticle;
 936         }
 937
 938         /**
 939          * Set whether this page is related an article on the wiki
 940          * Setting false will cause the change of "article flag" toggle to false
 941          *
 942          * @param $v Boolean
 943          */
 944         public function setArticleRelated( $v ) {
 945                 $this->mIsArticleRelated = $v;
 946                 if ( !$v ) {
 947                         $this->mIsarticle = false;
 948                 }
 949         }
 950
 951         /**
 952          * Return whether this page is related an article on the wiki
 953          *
 954          * @return Boolean
 955          */
 956         public function isArticleRelated() {
 957                 return $this->mIsArticleRelated;
 958         }
 959
 960         /**
 961          * Add new language links
 962          *
 963          * @param $newLinkArray Associative array mapping language code to the page
 964          *                      name
 965          */
 966         public function addLanguageLinks( $newLinkArray ) {
 967                 $this->mLanguageLinks += $newLinkArray;
 968         }
 969
 970         /**
 971          * Reset the language links and add new language links
 972          *
 973          * @param $newLinkArray Associative array mapping language code to the page
 974          *                      name
 975          */
 976         public function setLanguageLinks( $newLinkArray ) {
 977                 $this->mLanguageLinks = $newLinkArray;
 978         }
 979
 980         /**
 981          * Get the list of language links
 982          *
 983          * @return Array of Interwiki Prefixed (non DB key) Titles (e.g. 'fr:Test page')
 984          */
 985         public function getLanguageLinks() {
 986                 return $this->mLanguageLinks;
 987         }
 988
 989         /**
 990          * Add an array of categories, with names in the keys
 991          *
 992          * @param $categories Array mapping category name => sort key
 993          */
 994         public function addCategoryLinks( $categories ) {
 995                 global $wgUser, $wgContLang;
 996
 997                 if ( !is_array( $categories ) || count( $categories ) == 0 ) {
 998                         return;
 999                 }
1000
1001                 # Add the links to a LinkBatch
1002                 $arr = array( NS_CATEGORY => $categories );
1003                 $lb = new LinkBatch;
1004                 $lb->setArray( $arr );
1005
1006                 # Fetch existence plus the hiddencat property
1007                 $dbr = wfGetDB( DB_SLAVE );
1008                 $res = $dbr->select( array( 'page', 'page_props' ),
1009                         array( 'page_id', 'page_namespace', 'page_title', 'page_len', 'page_is_redirect', 'page_latest', 'pp_value' ),
1010                         $lb->constructSet( 'page', $dbr ),
1011                         __METHOD__,
1012                         array(),
1013                         array( 'page_props' => array( 'LEFT JOIN', array( 'pp_propname' => 'hiddencat', 'pp_page = page_id' ) ) )
1014                 );
1015
1016                 # Add the results to the link cache
1017                 $lb->addResultToCache( LinkCache::singleton(), $res );
1018
1019                 # Set all the values to 'normal'. This can be done with array_fill_keys in PHP 5.2.0+
1020                 $categories = array_combine(
1021                         array_keys( $categories ),
1022                         array_fill( 0, count( $categories ), 'normal' )
1023                 );
1024
1025                 # Mark hidden categories
1026                 foreach ( $res as $row ) {
1027                         if ( isset( $row->pp_value ) ) {
1028                                 $categories[$row->page_title] = 'hidden';
1029                         }
1030                 }
1031
1032                 # Add the remaining categories to the skin
1033                 if ( wfRunHooks( 'OutputPageMakeCategoryLinks', array( &$this, $categories, &$this->mCategoryLinks ) ) ) {
1034                         $sk = $wgUser->getSkin();
1035                         foreach ( $categories as $category => $type ) {
1036                                 $origcategory = $category;
1037                                 $title = Title::makeTitleSafe( NS_CATEGORY, $category );
1038                                 $wgContLang->findVariantLink( $category, $title, true );
1039                                 if ( $category != $origcategory ) {
1040                                         if ( array_key_exists( $category, $categories ) ) {
1041                                                 continue;
1042                                         }
1043                                 }
1044                                 $text = $wgContLang->convertHtml( $title->getText() );
1045                                 $this->mCategories[] = $title->getText();
1046                                 $this->mCategoryLinks[$type][] = $sk->link( $title, $text );
1047                         }
1048                 }
1049         }
1050
1051         /**
1052          * Reset the category links (but not the category list) and add $categories
1053          *
1054          * @param $categories Array mapping category name => sort key
1055          */
1056         public function setCategoryLinks( $categories ) {
1057                 $this->mCategoryLinks = array();
1058                 $this->addCategoryLinks( $categories );
1059         }
1060
1061         /**
1062          * Get the list of category links, in a 2-D array with the following format:
1063          * $arr[$type][] = $link, where $type is either "normal" or "hidden" (for
1064          * hidden categories) and $link a HTML fragment with a link to the category
1065          * page
1066          *
1067          * @return Array
1068          */
1069         public function getCategoryLinks() {
1070                 return $this->mCategoryLinks;
1071         }
1072
1073         /**
1074          * Get the list of category names this page belongs to
1075          *
1076          * @return Array of strings
1077          */
1078         public function getCategories() {
1079                 return $this->mCategories;
1080         }
1081
1082         /**
1083          * Do not allow scripts which can be modified by wiki users to load on this page;
1084          * only allow scripts bundled with, or generated by, the software.
1085          */
1086         public function disallowUserJs() {
1087                 $this->reduceAllowedModules(
1088                         ResourceLoaderModule::TYPE_SCRIPTS,
1089                         ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL
1090                 );
1091         }
1092
1093         /**
1094          * Return whether user JavaScript is allowed for this page
1095          * @deprecated @since 1.18 Load modules with ResourceLoader, and origin and
1096          *     trustworthiness is identified and enforced automagically.
1097          * @return Boolean
1098          */
1099         public function isUserJsAllowed() {
1100                 return $this->getAllowedModules( ResourceLoaderModule::TYPE_SCRIPTS ) >= ResourceLoaderModule::ORIGIN_USER_INDIVIDUAL;
1101         }
1102
1103         /**
1104          * Show what level of JavaScript / CSS untrustworthiness is allowed on this page
1105          * @see ResourceLoaderModule::$origin
1106          * @param $type String ResourceLoaderModule TYPE_ constant
1107          * @return Int ResourceLoaderModule ORIGIN_ class constant
1108          */
1109         public function getAllowedModules( $type ){
1110                 if( $type == ResourceLoaderModule::TYPE_COMBINED ){
1111                         return min( array_values( $this->mAllowedModules ) );
1112                 } else {
1113                         return isset( $this->mAllowedModules[$type] )
1114                                 ? $this->mAllowedModules[$type]
1115                                 : ResourceLoaderModule::ORIGIN_ALL;
1116                 }
1117         }
1118
1119         /**
1120          * Set the highest level of CSS/JS untrustworthiness allowed
1121          * @param  $type String ResourceLoaderModule TYPE_ constant
1122          * @param  $level Int ResourceLoaderModule class constant
1123          */
1124         public function setAllowedModules( $type, $level ){
1125                 $this->mAllowedModules[$type] = $level;
1126         }
1127
1128         /**
1129          * As for setAllowedModules(), but don't inadvertantly make the page more accessible
1130          * @param  $type String
1131          * @param  $level Int ResourceLoaderModule class constant
1132          */
1133         public function reduceAllowedModules( $type, $level ){
1134                 $this->mAllowedModules[$type] = min( $this->getAllowedModules($type), $level );
1135         }
1136
1137         /**
1138          * Prepend $text to the body HTML
1139          *
1140          * @param $text String: HTML
1141          */
1142         public function prependHTML( $text ) {
1143                 $this->mBodytext = $text . $this->mBodytext;
1144         }
1145
1146         /**
1147          * Append $text to the body HTML
1148          *
1149          * @param $text String: HTML
1150          */
1151         public function addHTML( $text ) {
1152                 $this->mBodytext .= $text;
1153         }
1154
1155         /**
1156          * Clear the body HTML
1157          */
1158         public function clearHTML() {
1159                 $this->mBodytext = '';
1160         }
1161
1162         /**
1163          * Get the body HTML
1164          *
1165          * @return String: HTML
1166          */
1167         public function getHTML() {
1168                 return $this->mBodytext;
1169         }
1170
1171         /**
1172          * Add $text to the debug output
1173          *
1174          * @param $text String: debug text
1175          */
1176         public function debug( $text ) {
1177                 $this->mDebugtext .= $text;
1178         }
1179
1180         /**
1181          * Get/set the ParserOptions object to use for wikitext parsing
1182          *
1183          * @param $options either the ParserOption to use or null to only get the
1184          *                 current ParserOption object
1185          * @return ParserOptions object
1186          */
1187         public function parserOptions( $options = null ) {
1188                 if ( !$this->mParserOptions ) {
1189                         $this->mParserOptions = new ParserOptions;
1190                 }
1191                 return wfSetVar( $this->mParserOptions, $options );
1192         }
1193
1194         /**
1195          * Set the revision ID which will be seen by the wiki text parser
1196          * for things such as embedded {{REVISIONID}} variable use.
1197          *
1198          * @param $revid Mixed: an positive integer, or null
1199          * @return Mixed: previous value
1200          */
1201         public function setRevisionId( $revid ) {
1202                 $val = is_null( $revid ) ? null : intval( $revid );
1203                 return wfSetVar( $this->mRevisionId, $val );
1204         }
1205
1206         /**
1207          * Get the current revision ID
1208          *
1209          * @return Integer
1210          */
1211         public function getRevisionId() {
1212                 return $this->mRevisionId;
1213         }
1214
1215         /**
1216          * Convert wikitext to HTML and add it to the buffer
1217          * Default assumes that the current page title will be used.
1218          *
1219          * @param $text String
1220          * @param $linestart Boolean: is this the start of a line?
1221          */
1222         public function addWikiText( $text, $linestart = true ) {
1223                 $title = $this->getTitle(); // Work arround E_STRICT
1224                 $this->addWikiTextTitle( $text, $title, $linestart );
1225         }
1226
1227         /**
1228          * Add wikitext with a custom Title object
1229          *
1230          * @param $text String: wikitext
1231          * @param $title Title object
1232          * @param $linestart Boolean: is this the start of a line?
1233          */
1234         public function addWikiTextWithTitle( $text, &$title, $linestart = true ) {
1235                 $this->addWikiTextTitle( $text, $title, $linestart );
1236         }
1237
1238         /**
1239          * Add wikitext with a custom Title object and
1240          *
1241          * @param $text String: wikitext
1242          * @param $title Title object
1243          * @param $linestart Boolean: is this the start of a line?
1244          */
1245         function addWikiTextTitleTidy( $text, &$title, $linestart = true ) {
1246                 $this->addWikiTextTitle( $text, $title, $linestart, true );
1247         }
1248
1249         /**
1250          * Add wikitext with tidy enabled
1251          *
1252          * @param $text String: wikitext
1253          * @param $linestart Boolean: is this the start of a line?
1254          */
1255         public function addWikiTextTidy( $text, $linestart = true ) {
1256                 $title = $this->getTitle();
1257                 $this->addWikiTextTitleTidy( $text, $title, $linestart );
1258         }
1259
1260         /**
1261          * Add wikitext with a custom Title object
1262          *
1263          * @param $text String: wikitext
1264          * @param $title Title object
1265          * @param $linestart Boolean: is this the start of a line?
1266          * @param $tidy Boolean: whether to use tidy
1267          */
1268         public function addWikiTextTitle( $text, &$title, $linestart, $tidy = false ) {
1269                 global $wgParser;
1270
1271                 wfProfileIn( __METHOD__ );
1272
1273                 wfIncrStats( 'pcache_not_possible' );
1274
1275                 $popts = $this->parserOptions();
1276                 $oldTidy = $popts->setTidy( $tidy );
1277
1278                 $parserOutput = $wgParser->parse(
1279                         $text, $title, $popts,
1280                         $linestart, true, $this->mRevisionId
1281                 );
1282
1283                 $popts->setTidy( $oldTidy );
1284
1285                 $this->addParserOutput( $parserOutput );
1286
1287                 wfProfileOut( __METHOD__ );
1288         }
1289
1290         /**
1291          * Add a ParserOutput object, but without Html
1292          *
1293          * @param $parserOutput ParserOutput object
1294          */
1295         public function addParserOutputNoText( &$parserOutput ) {
1296                 $this->mLanguageLinks += $parserOutput->getLanguageLinks();
1297                 $this->addCategoryLinks( $parserOutput->getCategories() );
1298                 $this->mNewSectionLink = $parserOutput->getNewSection();
1299                 $this->mHideNewSectionLink = $parserOutput->getHideNewSection();
1300
1301                 $this->mParseWarnings = $parserOutput->getWarnings();
1302                 if ( !$parserOutput->isCacheable() ) {
1303                         $this->enableClientCache( false );
1304                 }
1305                 $this->mNoGallery = $parserOutput->getNoGallery();
1306                 $this->mHeadItems = array_merge( $this->mHeadItems, $parserOutput->getHeadItems() );
1307                 $this->addModules( $parserOutput->getModules() );
1308                 // Versioning...
1309                 foreach ( (array)$parserOutput->mTemplateIds as $ns => $dbks ) {
1310                         if ( isset( $this->mTemplateIds[$ns] ) ) {
1311                                 $this->mTemplateIds[$ns] = $dbks + $this->mTemplateIds[$ns];
1312                         } else {
1313                                 $this->mTemplateIds[$ns] = $dbks;
1314                         }
1315                 }
1316
1317                 // Hooks registered in the object
1318                 global $wgParserOutputHooks;
1319                 foreach ( $parserOutput->getOutputHooks() as $hookInfo ) {
1320                         list( $hookName, $data ) = $hookInfo;
1321                         if ( isset( $wgParserOutputHooks[$hookName] ) ) {
1322                                 call_user_func( $wgParserOutputHooks[$hookName], $this, $parserOutput, $data );
1323                         }
1324                 }
1325
1326                 wfRunHooks( 'OutputPageParserOutput', array( &$this, $parserOutput ) );
1327         }
1328
1329         /**
1330          * Add a ParserOutput object
1331          *
1332          * @param $parserOutput ParserOutput
1333          */
1334         function addParserOutput( &$parserOutput ) {
1335                 $this->addParserOutputNoText( $parserOutput );
1336                 $text = $parserOutput->getText();
1337                 wfRunHooks( 'OutputPageBeforeHTML', array( &$this, &$text ) );
1338                 $this->addHTML( $text );
1339         }
1340
1341
1342         /**
1343          * Add the output of a QuickTemplate to the output buffer
1344          *
1345          * @param $template QuickTemplate
1346          */
1347         public function addTemplate( &$template ) {
1348                 ob_start();
1349                 $template->execute();
1350                 $this->addHTML( ob_get_contents() );
1351                 ob_end_clean();
1352         }
1353
1354         /**
1355          * Parse wikitext and return the HTML.
1356          *
1357          * @param $text String
1358          * @param $linestart Boolean: is this the start of a line?
1359          * @param $interface Boolean: use interface language ($wgLang instead of
1360          *                   $wgContLang) while parsing language sensitive magic
1361          *                   words like GRAMMAR and PLURAL
1362          * @param $language  Language object: target language object, will override
1363          *                   $interface
1364          * @return String: HTML
1365          */
1366         public function parse( $text, $linestart = true, $interface = false, $language = null ) {
1367                 // Check one for one common cause for parser state resetting
1368                 $callers = wfGetAllCallers( 10 );
1369                 if ( strpos( $callers, 'Parser::extensionSubstitution' ) !== false ) {
1370                         throw new MWException( "wfMsg* function with parsing cannot be used " .
1371                                 "inside a tag hook. Should use parser->recursiveTagParse() instead" );
1372                 }
1373
1374                 global $wgParser;
1375
1376                 if( is_null( $this->getTitle() ) ) {
1377                         throw new MWException( 'Empty $mTitle in ' . __METHOD__ );
1378                 }
1379
1380                 $popts = $this->parserOptions();
1381                 if ( $interface ) {
1382                         $popts->setInterfaceMessage( true );
1383                 }
1384                 if ( $language !== null ) {
1385                         $oldLang = $popts->setTargetLanguage( $language );
1386                 }
1387
1388                 $parserOutput = $wgParser->parse(
1389                         $text, $this->getTitle(), $popts,
1390                         $linestart, true, $this->mRevisionId
1391                 );
1392
1393                 if ( $interface ) {
1394                         $popts->setInterfaceMessage( false );
1395                 }
1396                 if ( $language !== null ) {
1397                         $popts->setTargetLanguage( $oldLang );
1398                 }
1399
1400                 return $parserOutput->getText();
1401         }
1402
1403         /**
1404          * Parse wikitext, strip paragraphs, and return the HTML.
1405          *
1406          * @param $text String
1407          * @param $linestart Boolean: is this the start of a line?
1408          * @param $interface Boolean: use interface language ($wgLang instead of
1409          *                   $wgContLang) while parsing language sensitive magic
1410          *                   words like GRAMMAR and PLURAL
1411          * @return String: HTML
1412          */
1413         public function parseInline( $text, $linestart = true, $interface = false ) {
1414                 $parsed = $this->parse( $text, $linestart, $interface );
1415
1416                 $m = array();
1417                 if ( preg_match( '/^<p>(.*)\n?<\/p>\n?/sU', $parsed, $m ) ) {
1418                         $parsed = $m[1];
1419                 }
1420
1421                 return $parsed;
1422         }
1423
1424         /**
1425          * Set the value of the "s-maxage" part of the "Cache-control" HTTP header
1426          *
1427          * @param $maxage Integer: maximum cache time on the Squid, in seconds.
1428          */
1429         public function setSquidMaxage( $maxage ) {
1430                 $this->mSquidMaxage = $maxage;
1431         }
1432
1433         /**
1434          * Use enableClientCache(false) to force it to send nocache headers
1435          *
1436          * @param $state ??
1437          */
1438         public function enableClientCache( $state ) {
1439                 return wfSetVar( $this->mEnableClientCache, $state );
1440         }
1441
1442         /**
1443          * Get the list of cookies that will influence on the cache
1444          *
1445          * @return Array
1446          */
1447         function getCacheVaryCookies() {
1448                 global $wgCookiePrefix, $wgCacheVaryCookies;
1449                 static $cookies;
1450                 if ( $cookies === null ) {
1451                         $cookies = array_merge(
1452                                 array(
1453                                         "{$wgCookiePrefix}Token",
1454                                         "{$wgCookiePrefix}LoggedOut",
1455                                         session_name()
1456                                 ),
1457                                 $wgCacheVaryCookies
1458                         );
1459                         wfRunHooks( 'GetCacheVaryCookies', array( $this, &$cookies ) );
1460                 }
1461                 return $cookies;
1462         }
1463
1464         /**
1465          * Return whether this page is not cacheable because "useskin" or "uselang"
1466          * URL parameters were passed.
1467          *
1468          * @return Boolean
1469          */
1470         function uncacheableBecauseRequestVars() {
1471                 global $wgRequest;
1472                 return $wgRequest->getText( 'useskin', false ) === false
1473                         && $wgRequest->getText( 'uselang', false ) === false;
1474         }
1475
1476         /**
1477          * Check if the request has a cache-varying cookie header
1478          * If it does, it's very important that we don't allow public caching
1479          *
1480          * @return Boolean
1481          */
1482         function haveCacheVaryCookies() {
1483                 global $wgRequest;
1484                 $cookieHeader = $wgRequest->getHeader( 'cookie' );
1485                 if ( $cookieHeader === false ) {
1486                         return false;
1487                 }
1488                 $cvCookies = $this->getCacheVaryCookies();
1489                 foreach ( $cvCookies as $cookieName ) {
1490                         # Check for a simple string match, like the way squid does it
1491                         if ( strpos( $cookieHeader, $cookieName ) !== false ) {
1492                                 wfDebug( __METHOD__ . ": found $cookieName\n" );
1493                                 return true;
1494                         }
1495                 }
1496                 wfDebug( __METHOD__ . ": no cache-varying cookies found\n" );
1497                 return false;
1498         }
1499
1500         /**
1501          * Add an HTTP header that will influence on the cache
1502          *
1503          * @param $header String: header name
1504          * @param $option Array|null
1505          * @fixme Document the $option parameter; it appears to be for
1506          *        X-Vary-Options but what format is acceptable?
1507          */
1508         public function addVaryHeader( $header, $option = null ) {
1509                 if ( !array_key_exists( $header, $this->mVaryHeader ) ) {
1510                         $this->mVaryHeader[$header] = (array)$option;
1511                 } elseif( is_array( $option ) ) {
1512                         if( is_array( $this->mVaryHeader[$header] ) ) {
1513                                 $this->mVaryHeader[$header] = array_merge( $this->mVaryHeader[$header], $option );
1514                         } else {
1515                                 $this->mVaryHeader[$header] = $option;
1516                         }
1517                 }
1518                 $this->mVaryHeader[$header] = array_unique( $this->mVaryHeader[$header] );
1519         }
1520
1521         /**
1522          * Get a complete X-Vary-Options header
1523          *
1524          * @return String
1525          */
1526         public function getXVO() {
1527                 $cvCookies = $this->getCacheVaryCookies();
1528
1529                 $cookiesOption = array();
1530                 foreach ( $cvCookies as $cookieName ) {
1531                         $cookiesOption[] = 'string-contains=' . $cookieName;
1532                 }
1533                 $this->addVaryHeader( 'Cookie', $cookiesOption );
1534
1535                 $headers = array();
1536                 foreach( $this->mVaryHeader as $header => $option ) {
1537                         $newheader = $header;
1538                         if( is_array( $option ) ) {
1539                                 $newheader .= ';' . implode( ';', $option );
1540                         }
1541                         $headers[] = $newheader;
1542                 }
1543                 $xvo = 'X-Vary-Options: ' . implode( ',', $headers );
1544
1545                 return $xvo;
1546         }
1547
1548         /**
1549          * bug 21672: Add Accept-Language to Vary and XVO headers
1550          * if there's no 'variant' parameter existed in GET.
1551          *
1552          * For example:
1553          *   /w/index.php?title=Main_page should always be served; but
1554          *   /w/index.php?title=Main_page&variant=zh-cn should never be served.
1555          */
1556         function addAcceptLanguage() {
1557                 global $wgRequest, $wgContLang;
1558                 if( !$wgRequest->getCheck( 'variant' ) && $wgContLang->hasVariants() ) {
1559                         $variants = $wgContLang->getVariants();
1560                         $aloption = array();
1561                         foreach ( $variants as $variant ) {
1562                                 if( $variant === $wgContLang->getCode() ) {
1563                                         continue;
1564                                 } else {
1565                                         $aloption[] = 'string-contains=' . $variant;
1566
1567                                         // IE and some other browsers use another form of language code
1568                                         // in their Accept-Language header, like "zh-CN" or "zh-TW".
1569                                         // We should handle these too.
1570                                         $ievariant = explode( '-', $variant );
1571                                         if ( count( $ievariant ) == 2 ) {
1572                                                 $ievariant[1] = strtoupper( $ievariant[1] );
1573                                                 $ievariant = implode( '-', $ievariant );
1574                                                 $aloption[] = 'string-contains=' . $ievariant;
1575                                         }
1576                                 }
1577                         }
1578                         $this->addVaryHeader( 'Accept-Language', $aloption );
1579                 }
1580         }
1581
1582         /**
1583          * Set a flag which will cause an X-Frame-Options header appropriate for
1584          * edit pages to be sent. The header value is controlled by
1585          * $wgEditPageFrameOptions.
1586          *
1587          * This is the default for special pages. If you display a CSRF-protected
1588          * form on an ordinary view page, then you need to call this function.
1589          */
1590         public function preventClickjacking( $enable = true ) {
1591                 $this->mPreventClickjacking = $enable;
1592         }
1593
1594         /**
1595          * Turn off frame-breaking. Alias for $this->preventClickjacking(false).
1596          * This can be called from pages which do not contain any CSRF-protected
1597          * HTML form.
1598          */
1599         public function allowClickjacking() {
1600                 $this->mPreventClickjacking = false;
1601         }
1602
1603         /**
1604          * Get the X-Frame-Options header value (without the name part), or false
1605          * if there isn't one. This is used by Skin to determine whether to enable
1606          * JavaScript frame-breaking, for clients that don't support X-Frame-Options.
1607          */
1608         public function getFrameOptions() {
1609                 global $wgBreakFrames, $wgEditPageFrameOptions;
1610                 if ( $wgBreakFrames ) {
1611                         return 'DENY';
1612                 } elseif ( $this->mPreventClickjacking && $wgEditPageFrameOptions ) {
1613                         return $wgEditPageFrameOptions;
1614                 }
1615         }
1616
1617         /**
1618          * Send cache control HTTP headers
1619          */
1620         public function sendCacheControl() {
1621                 global $wgUseSquid, $wgUseESI, $wgUseETag, $wgSquidMaxage, $wgRequest, $wgUseXVO;
1622
1623                 $response = $wgRequest->response();
1624                 if ( $wgUseETag && $this->mETag ) {
1625                         $response->header( "ETag: $this->mETag" );
1626                 }
1627
1628                 $this->addAcceptLanguage();
1629
1630                 # don't serve compressed data to clients who can't handle it
1631                 # maintain different caches for logged-in users and non-logged in ones
1632                 $response->header( 'Vary: ' . join( ', ', array_keys( $this->mVaryHeader ) ) );
1633
1634                 if ( $wgUseXVO ) {
1635                         # Add an X-Vary-Options header for Squid with Wikimedia patches
1636                         $response->header( $this->getXVO() );
1637                 }
1638
1639                 if( !$this->uncacheableBecauseRequestVars() && $this->mEnableClientCache ) {
1640                         if(
1641                                 $wgUseSquid && session_id() == '' && !$this->isPrintable() &&
1642                                 $this->mSquidMaxage != 0 && !$this->haveCacheVaryCookies()
1643                         )
1644                         {
1645                                 if ( $wgUseESI ) {
1646                                         # We'll purge the proxy cache explicitly, but require end user agents
1647                                         # to revalidate against the proxy on each visit.
1648                                         # Surrogate-Control controls our Squid, Cache-Control downstream caches
1649                                         wfDebug( __METHOD__ . ": proxy caching with ESI; {$this->mLastModified} **\n", false );
1650                                         # start with a shorter timeout for initial testing
1651                                         # header( 'Surrogate-Control: max-age=2678400+2678400, content="ESI/1.0"');
1652                                         $response->header( 'Surrogate-Control: max-age='.$wgSquidMaxage.'+'.$this->mSquidMaxage.', content="ESI/1.0"');
1653                                         $response->header( 'Cache-Control: s-maxage=0, must-revalidate, max-age=0' );
1654                                 } else {
1655                                         # We'll purge the proxy cache for anons explicitly, but require end user agents
1656                                         # to revalidate against the proxy on each visit.
1657                                         # IMPORTANT! The Squid needs to replace the Cache-Control header with
1658                                         # Cache-Control: s-maxage=0, must-revalidate, max-age=0
1659                                         wfDebug( __METHOD__ . ": local proxy caching; {$this->mLastModified} **\n", false );
1660                                         # start with a shorter timeout for initial testing
1661                                         # header( "Cache-Control: s-maxage=2678400, must-revalidate, max-age=0" );
1662                                         $response->header( 'Cache-Control: s-maxage='.$this->mSquidMaxage.', must-revalidate, max-age=0' );
1663                                 }
1664                         } else {
1665                                 # We do want clients to cache if they can, but they *must* check for updates
1666                                 # on revisiting the page.
1667                                 wfDebug( __METHOD__ . ": private caching; {$this->mLastModified} **\n", false );
1668                                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1669                                 $response->header( "Cache-Control: private, must-revalidate, max-age=0" );
1670                         }
1671                         if($this->mLastModified) {
1672                                 $response->header( "Last-Modified: {$this->mLastModified}" );
1673                         }
1674                 } else {
1675                         wfDebug( __METHOD__ . ": no caching **\n", false );
1676
1677                         # In general, the absence of a last modified header should be enough to prevent
1678                         # the client from using its cache. We send a few other things just to make sure.
1679                         $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1680                         $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
1681                         $response->header( 'Pragma: no-cache' );
1682                 }
1683         }
1684
1685         /**
1686          * Get the message associed with the HTTP response code $code
1687          *
1688          * @param $code Integer: status code
1689          * @return String or null: message or null if $code is not in the list of
1690          *         messages
1691          */
1692         public static function getStatusMessage( $code ) {
1693                 static $statusMessage = array(
1694                         100 => 'Continue',
1695                         101 => 'Switching Protocols',
1696                         102 => 'Processing',
1697                         200 => 'OK',
1698                         201 => 'Created',
1699                         202 => 'Accepted',
1700                         203 => 'Non-Authoritative Information',
1701                         204 => 'No Content',
1702                         205 => 'Reset Content',
1703                         206 => 'Partial Content',
1704                         207 => 'Multi-Status',
1705                         300 => 'Multiple Choices',
1706                         301 => 'Moved Permanently',
1707                         302 => 'Found',
1708                         303 => 'See Other',
1709                         304 => 'Not Modified',
1710                         305 => 'Use Proxy',
1711                         307 => 'Temporary Redirect',
1712                         400 => 'Bad Request',
1713                         401 => 'Unauthorized',
1714                         402 => 'Payment Required',
1715                         403 => 'Forbidden',
1716                         404 => 'Not Found',
1717                         405 => 'Method Not Allowed',
1718                         406 => 'Not Acceptable',
1719                         407 => 'Proxy Authentication Required',
1720                         408 => 'Request Timeout',
1721                         409 => 'Conflict',
1722                         410 => 'Gone',
1723                         411 => 'Length Required',
1724                         412 => 'Precondition Failed',
1725                         413 => 'Request Entity Too Large',
1726                         414 => 'Request-URI Too Large',
1727                         415 => 'Unsupported Media Type',
1728                         416 => 'Request Range Not Satisfiable',
1729                         417 => 'Expectation Failed',
1730                         422 => 'Unprocessable Entity',
1731                         423 => 'Locked',
1732                         424 => 'Failed Dependency',
1733                         500 => 'Internal Server Error',
1734                         501 => 'Not Implemented',
1735                         502 => 'Bad Gateway',
1736                         503 => 'Service Unavailable',
1737                         504 => 'Gateway Timeout',
1738                         505 => 'HTTP Version Not Supported',
1739                         507 => 'Insufficient Storage'
1740                 );
1741                 return isset( $statusMessage[$code] ) ? $statusMessage[$code] : null;
1742         }
1743
1744         /**
1745          * Finally, all the text has been munged and accumulated into
1746          * the object, let's actually output it:
1747          */
1748         public function output() {
1749                 global $wgUser, $wgOutputEncoding, $wgRequest;
1750                 global $wgLanguageCode, $wgDebugRedirects, $wgMimeType;
1751                 global $wgUseAjax, $wgAjaxWatch;
1752                 global $wgEnableMWSuggest, $wgUniversalEditButton;
1753
1754                 if( $this->mDoNothing ) {
1755                         return;
1756                 }
1757                 wfProfileIn( __METHOD__ );
1758                 if ( $this->mRedirect != '' ) {
1759                         # Standards require redirect URLs to be absolute
1760                         $this->mRedirect = wfExpandUrl( $this->mRedirect );
1761                         if( $this->mRedirectCode == '301' || $this->mRedirectCode == '303' ) {
1762                                 if( !$wgDebugRedirects ) {
1763                                         $message = self::getStatusMessage( $this->mRedirectCode );
1764                                         $wgRequest->response()->header( "HTTP/1.1 {$this->mRedirectCode} $message" );
1765                                 }
1766                                 $this->mLastModified = wfTimestamp( TS_RFC2822 );
1767                         }
1768                         $this->sendCacheControl();
1769
1770                         $wgRequest->response()->header( "Content-Type: text/html; charset=utf-8" );
1771                         if( $wgDebugRedirects ) {
1772                                 $url = htmlspecialchars( $this->mRedirect );
1773                                 print "<html>\n<head>\n<title>Redirect</title>\n</head>\n<body>\n";
1774                                 print "<p>Location: <a href=\"$url\">$url</a></p>\n";
1775                                 print "</body>\n</html>\n";
1776                         } else {
1777                                 $wgRequest->response()->header( 'Location: ' . $this->mRedirect );
1778                         }
1779                         wfProfileOut( __METHOD__ );
1780                         return;
1781                 } elseif ( $this->mStatusCode ) {
1782                         $message = self::getStatusMessage( $this->mStatusCode );
1783                         if ( $message ) {
1784                                 $wgRequest->response()->header( 'HTTP/1.1 ' . $this->mStatusCode . ' ' . $message );
1785                         }
1786                 }
1787
1788                 // Add base resources
1789                 $this->addModules( 'mediawiki.util' );
1790                 global $wgIncludeLegacyJavaScript;
1791                 if( $wgIncludeLegacyJavaScript ){
1792                         $this->addModules( 'mediawiki.legacy.wikibits' );
1793                 }
1794
1795                 // Add various resources if required
1796                 if ( $wgUseAjax ) {
1797                         $this->addModules( 'mediawiki.legacy.ajax' );
1798
1799                         wfRunHooks( 'AjaxAddScript', array( &$this ) );
1800
1801                         if( $wgAjaxWatch && $wgUser->isLoggedIn() ) {
1802                                 $this->addModules( 'mediawiki.action.watch.ajax' );
1803                         }
1804
1805                         if ( $wgEnableMWSuggest && !$wgUser->getOption( 'disablesuggest', false ) ) {
1806                                 $this->addModules( 'mediawiki.legacy.mwsuggest' );
1807                         }
1808                 }
1809
1810                 if( $wgUser->getBoolOption( 'editsectiononrightclick' ) ) {
1811                         $this->addModules( 'mediawiki.action.view.rightClickEdit' );
1812                 }
1813
1814                 if( $wgUniversalEditButton ) {
1815                         if( $this->isArticleRelated() && $this->getTitle() && $this->getTitle()->quickUserCan( 'edit' )
1816                                 && ( $this->getTitle()->exists() || $this->getTitle()->quickUserCan( 'create' ) ) ) {
1817                                 // Original UniversalEditButton
1818                                 $msg = wfMsg( 'edit' );
1819                                 $this->addLink( array(
1820                                         'rel' => 'alternate',
1821                                         'type' => 'application/x-wiki',
1822                                         'title' => $msg,
1823                                         'href' => $this->getTitle()->getLocalURL( 'action=edit' )
1824                                 ) );
1825                                 // Alternate edit link
1826                                 $this->addLink( array(
1827                                         'rel' => 'edit',
1828                                         'title' => $msg,
1829                                         'href' => $this->getTitle()->getLocalURL( 'action=edit' )
1830                                 ) );
1831                         }
1832                 }
1833
1834
1835                 # Buffer output; final headers may depend on later processing
1836                 ob_start();
1837
1838                 $wgRequest->response()->header( "Content-type: $wgMimeType; charset={$wgOutputEncoding}" );
1839                 $wgRequest->response()->header( 'Content-language: ' . $wgLanguageCode );
1840
1841                 // Prevent framing, if requested
1842                 $frameOptions = $this->getFrameOptions();
1843                 if ( $frameOptions ) {
1844                         $wgRequest->response()->header( "X-Frame-Options: $frameOptions" );
1845                 }
1846
1847                 if ( $this->mArticleBodyOnly ) {
1848                         $this->out( $this->mBodytext );
1849                 } else {
1850                         $sk = $wgUser->getSkin();
1851
1852                         // Hook that allows last minute changes to the output page, e.g.
1853                         // adding of CSS or Javascript by extensions.
1854                         wfRunHooks( 'BeforePageDisplay', array( &$this, &$sk ) );
1855
1856                         wfProfileIn( 'Output-skin' );
1857                         $sk->outputPage( $this );
1858                         wfProfileOut( 'Output-skin' );
1859                 }
1860
1861                 $this->sendCacheControl();
1862                 ob_end_flush();
1863                 wfProfileOut( __METHOD__ );
1864         }
1865
1866         /**
1867          * Actually output something with print(). Performs an iconv to the
1868          * output encoding, if needed.
1869          *
1870          * @param $ins String: the string to output
1871          */
1872         public function out( $ins ) {
1873                 global $wgInputEncoding, $wgOutputEncoding, $wgContLang;
1874                 if ( 0 == strcmp( $wgInputEncoding, $wgOutputEncoding ) ) {
1875                         $outs = $ins;
1876                 } else {
1877                         $outs = $wgContLang->iconv( $wgInputEncoding, $wgOutputEncoding, $ins );
1878                         if ( false === $outs ) {
1879                                 $outs = $ins;
1880                         }
1881                 }
1882                 print $outs;
1883         }
1884
1885         /**
1886          * Produce a "user is blocked" page.
1887          *
1888          * @param $return Boolean: whether to have a "return to $wgTitle" message or not.
1889          * @return nothing
1890          */
1891         function blockedPage( $return = true ) {
1892                 global $wgUser, $wgContLang, $wgLang;
1893
1894                 $this->setPageTitle( wfMsg( 'blockedtitle' ) );
1895                 $this->setRobotPolicy( 'noindex,nofollow' );
1896                 $this->setArticleRelated( false );
1897
1898                 $name = User::whoIs( $wgUser->blockedBy() );
1899                 $reason = $wgUser->blockedFor();
1900                 if( $reason == '' ) {
1901                         $reason = wfMsg( 'blockednoreason' );
1902                 }
1903                 $blockTimestamp = $wgLang->timeanddate(
1904                         wfTimestamp( TS_MW, $wgUser->mBlock->mTimestamp ), true
1905                 );
1906                 $ip = wfGetIP();
1907
1908                 $link = '[[' . $wgContLang->getNsText( NS_USER ) . ":{$name}|{$name}]]";
1909
1910                 $blockid = $wgUser->mBlock->mId;
1911
1912                 $blockExpiry = $wgUser->mBlock->mExpiry;
1913                 if ( $blockExpiry == 'infinity' ) {
1914                         // Entry in database (table ipblocks) is 'infinity' but 'ipboptions' uses 'infinite' or 'indefinite'
1915                         // Search for localization in 'ipboptions'
1916                         $scBlockExpiryOptions = wfMsg( 'ipboptions' );
1917                         foreach ( explode( ',', $scBlockExpiryOptions ) as $option ) {
1918                                 if ( strpos( $option, ':' ) === false ) {
1919                                         continue;
1920                                 }
1921                                 list( $show, $value ) = explode( ':', $option );
1922                                 if ( $value == 'infinite' || $value == 'indefinite' ) {
1923                                         $blockExpiry = $show;
1924                                         break;
1925                                 }
1926                         }
1927                 } else {
1928                         $blockExpiry = $wgLang->timeanddate(
1929                                 wfTimestamp( TS_MW, $blockExpiry ),
1930                                 true
1931                         );
1932                 }
1933
1934                 if ( $wgUser->mBlock->mAuto ) {
1935                         $msg = 'autoblockedtext';
1936                 } else {
1937                         $msg = 'blockedtext';
1938                 }
1939
1940                 /* $ip returns who *is* being blocked, $intended contains who was meant to be blocked.
1941                  * This could be a username, an IP range, or a single IP. */
1942                 $intended = $wgUser->mBlock->mAddress;
1943
1944                 $this->addWikiMsg(
1945                         $msg, $link, $reason, $ip, $name, $blockid, $blockExpiry,
1946                         $intended, $blockTimestamp
1947                 );
1948
1949                 # Don't auto-return to special pages
1950                 if( $return ) {
1951                         $return = $this->getTitle()->getNamespace() > -1 ? $this->getTitle() : null;
1952                         $this->returnToMain( null, $return );
1953                 }
1954         }
1955
1956         /**
1957          * Output a standard error page
1958          *
1959          * @param $title String: message key for page title
1960          * @param $msg String: message key for page text
1961          * @param $params Array: message parameters
1962          */
1963         public function showErrorPage( $title, $msg, $params = array() ) {
1964                 if ( $this->getTitle() ) {
1965                         $this->mDebugtext .= 'Original title: ' . $this->getTitle()->getPrefixedText() . "\n";
1966                 }
1967                 $this->setPageTitle( wfMsg( $title ) );
1968                 $this->setHTMLTitle( wfMsg( 'errorpagetitle' ) );
1969                 $this->setRobotPolicy( 'noindex,nofollow' );
1970                 $this->setArticleRelated( false );
1971                 $this->enableClientCache( false );
1972                 $this->mRedirect = '';
1973                 $this->mBodytext = '';
1974
1975                 $this->addWikiMsgArray( $msg, $params );
1976
1977                 $this->returnToMain();
1978         }
1979
1980         /**
1981          * Output a standard permission error page
1982          *
1983          * @param $errors Array: error message keys
1984          * @param $action String: action that was denied or null if unknown
1985          */
1986         public function showPermissionsErrorPage( $errors, $action = null ) {
1987                 $this->mDebugtext .= 'Original title: ' .
1988                 $this->getTitle()->getPrefixedText() . "\n";
1989                 $this->setPageTitle( wfMsg( 'permissionserrors' ) );
1990                 $this->setHTMLTitle( wfMsg( 'permissionserrors' ) );
1991                 $this->setRobotPolicy( 'noindex,nofollow' );
1992                 $this->setArticleRelated( false );
1993                 $this->enableClientCache( false );
1994                 $this->mRedirect = '';
1995                 $this->mBodytext = '';
1996                 $this->addWikiText( $this->formatPermissionsErrorMessage( $errors, $action ) );
1997         }
1998
1999         /**
2000          * Display an error page indicating that a given version of MediaWiki is
2001          * required to use it
2002          *
2003          * @param $version Mixed: the version of MediaWiki needed to use the page
2004          */
2005         public function versionRequired( $version ) {
2006                 $this->setPageTitle( wfMsg( 'versionrequired', $version ) );
2007                 $this->setHTMLTitle( wfMsg( 'versionrequired', $version ) );
2008                 $this->setRobotPolicy( 'noindex,nofollow' );
2009                 $this->setArticleRelated( false );
2010                 $this->mBodytext = '';
2011
2012                 $this->addWikiMsg( 'versionrequiredtext', $version );
2013                 $this->returnToMain();
2014         }
2015
2016         /**
2017          * Display an error page noting that a given permission bit is required.
2018          *
2019          * @param $permission String: key required
2020          */
2021         public function permissionRequired( $permission ) {
2022                 global $wgLang;
2023
2024                 $this->setPageTitle( wfMsg( 'badaccess' ) );
2025                 $this->setHTMLTitle( wfMsg( 'errorpagetitle' ) );
2026                 $this->setRobotPolicy( 'noindex,nofollow' );
2027                 $this->setArticleRelated( false );
2028                 $this->mBodytext = '';
2029
2030                 $groups = array_map( array( 'User', 'makeGroupLinkWiki' ),
2031                         User::getGroupsWithPermission( $permission ) );
2032                 if( $groups ) {
2033                         $this->addWikiMsg(
2034                                 'badaccess-groups',
2035                                 $wgLang->commaList( $groups ),
2036                                 count( $groups )
2037                         );
2038                 } else {
2039                         $this->addWikiMsg( 'badaccess-group0' );
2040                 }
2041                 $this->returnToMain();
2042         }
2043
2044         /**
2045          * Produce the stock "please login to use the wiki" page
2046          */
2047         public function loginToUse() {
2048                 global $wgUser;
2049
2050                 if( $wgUser->isLoggedIn() ) {
2051                         $this->permissionRequired( 'read' );
2052                         return;
2053                 }
2054
2055                 $skin = $wgUser->getSkin();
2056
2057                 $this->setPageTitle( wfMsg( 'loginreqtitle' ) );
2058                 $this->setHtmlTitle( wfMsg( 'errorpagetitle' ) );
2059                 $this->setRobotPolicy( 'noindex,nofollow' );
2060                 $this->setArticleRelated( false );
2061
2062                 $loginTitle = SpecialPage::getTitleFor( 'Userlogin' );
2063                 $loginLink = $skin->link(
2064                         $loginTitle,
2065                         wfMsgHtml( 'loginreqlink' ),
2066                         array(),
2067                         array( 'returnto' => $this->getTitle()->getPrefixedText() ),
2068                         array( 'known', 'noclasses' )
2069                 );
2070                 $this->addWikiMsgArray( 'loginreqpagetext', array( $loginLink ), array( 'replaceafter' ) );
2071                 $this->addHTML( "\n<!--" . $this->getTitle()->getPrefixedUrl() . '-->' );
2072
2073                 # Don't return to the main page if the user can't read it
2074                 # otherwise we'll end up in a pointless loop
2075                 $mainPage = Title::newMainPage();
2076                 if( $mainPage->userCanRead() ) {
2077                         $this->returnToMain( null, $mainPage );
2078                 }
2079         }
2080
2081         /**
2082          * Format a list of error messages
2083          *
2084          * @param $errors Array of arrays returned by Title::getUserPermissionsErrors
2085          * @param $action String: action that was denied or null if unknown
2086          * @return String: the wikitext error-messages, formatted into a list.
2087          */
2088         public function formatPermissionsErrorMessage( $errors, $action = null ) {
2089                 if ( $action == null ) {
2090                         $text = wfMsgNoTrans( 'permissionserrorstext', count( $errors ) ) . "\n\n";
2091                 } else {
2092                         $action_desc = wfMsgNoTrans( "action-$action" );
2093                         $text = wfMsgNoTrans(
2094                                 'permissionserrorstext-withaction',
2095                                 count( $errors ),
2096                                 $action_desc
2097                         ) . "\n\n";
2098                 }
2099
2100                 if ( count( $errors ) > 1 ) {
2101                         $text .= '<ul class="permissions-errors">' . "\n";
2102
2103                         foreach( $errors as $error ) {
2104                                 $text .= '<li>';
2105                                 $text .= call_user_func_array( 'wfMsgNoTrans', $error );
2106                                 $text .= "</li>\n";
2107                         }
2108                         $text .= '</ul>';
2109                 } else {
2110                         $text .= "<div class=\"permissions-errors\">\n" .
2111                                         call_user_func_array( 'wfMsgNoTrans', reset( $errors ) ) .
2112                                         "\n</div>";
2113                 }
2114
2115                 return $text;
2116         }
2117
2118         /**
2119          * Display a page stating that the Wiki is in read-only mode,
2120          * and optionally show the source of the page that the user
2121          * was trying to edit.  Should only be called (for this
2122          * purpose) after wfReadOnly() has returned true.
2123          *
2124          * For historical reasons, this function is _also_ used to
2125          * show the error message when a user tries to edit a page
2126          * they are not allowed to edit.  (Unless it's because they're
2127          * blocked, then we show blockedPage() instead.)  In this
2128          * case, the second parameter should be set to true and a list
2129          * of reasons supplied as the third parameter.
2130          *
2131          * @todo Needs to be split into multiple functions.
2132          *
2133          * @param $source    String: source code to show (or null).
2134          * @param $protected Boolean: is this a permissions error?
2135          * @param $reasons   Array: list of reasons for this error, as returned by Title::getUserPermissionsErrors().
2136          * @param $action    String: action that was denied or null if unknown
2137          */
2138         public function readOnlyPage( $source = null, $protected = false, $reasons = array(), $action = null ) {
2139                 global $wgUser;
2140                 $skin = $wgUser->getSkin();
2141
2142                 $this->setRobotPolicy( 'noindex,nofollow' );
2143                 $this->setArticleRelated( false );
2144
2145                 // If no reason is given, just supply a default "I can't let you do
2146                 // that, Dave" message.  Should only occur if called by legacy code.
2147                 if ( $protected && empty( $reasons ) ) {
2148                         $reasons[] = array( 'badaccess-group0' );
2149                 }
2150
2151                 if ( !empty( $reasons ) ) {
2152                         // Permissions error
2153                         if( $source ) {
2154                                 $this->setPageTitle( wfMsg( 'viewsource' ) );
2155                                 $this->setSubtitle(
2156                                         wfMsg( 'viewsourcefor', $skin->linkKnown( $this->getTitle() ) )
2157                                 );
2158                         } else {
2159                                 $this->setPageTitle( wfMsg( 'badaccess' ) );
2160                         }
2161                         $this->addWikiText( $this->formatPermissionsErrorMessage( $reasons, $action ) );
2162                 } else {
2163                         // Wiki is read only
2164                         $this->setPageTitle( wfMsg( 'readonly' ) );
2165                         $reason = wfReadOnlyReason();
2166                         $this->wrapWikiMsg( "<div class='mw-readonly-error'>\n$1\n</div>", array( 'readonlytext', $reason ) );
2167                 }
2168
2169                 // Show source, if supplied
2170                 if( is_string( $source ) ) {
2171                         $this->addWikiMsg( 'viewsourcetext' );
2172
2173                         $params = array(
2174                                 'id'   => 'wpTextbox1',
2175                                 'name' => 'wpTextbox1',
2176                                 'cols' => $wgUser->getOption( 'cols' ),
2177                                 'rows' => $wgUser->getOption( 'rows' ),
2178                                 'readonly' => 'readonly'
2179                         );
2180                         $this->addHTML( Html::element( 'textarea', $params, $source ) );
2181
2182                         // Show templates used by this article
2183                         $skin = $wgUser->getSkin();
2184                         $article = new Article( $this->getTitle() );
2185                         $this->addHTML( "<div class='templatesUsed'>
2186 {$skin->formatTemplates( $article->getUsedTemplates() )}
2187 </div>
2188 " );
2189                 }
2190
2191                 # If the title doesn't exist, it's fairly pointless to print a return
2192                 # link to it.  After all, you just tried editing it and couldn't, so
2193                 # what's there to do there?
2194                 if( $this->getTitle()->exists() ) {
2195                         $this->returnToMain( null, $this->getTitle() );
2196                 }
2197         }
2198
2199         /**
2200          * Adds JS-based password security checker
2201          * @param $passwordId String ID of input box containing password
2202          * @param $retypeId String ID of input box containing retyped password
2203          * @return none
2204          */
2205         public function addPasswordSecurity( $passwordId, $retypeId ) {
2206                 $data = array(
2207                         'password' => '#' . $passwordId,
2208                         'retype' => '#' . $retypeId,
2209                         'messages' => array(),
2210                 );
2211                 foreach ( array( 'password-strength', 'password-strength-bad', 'password-strength-mediocre',
2212                                 'password-strength-acceptable', 'password-strength-good', 'password-retype', 'password-retype-mismatch'
2213                         ) as $message ) {
2214                         $data['messages'][$message] = wfMsg( $message );
2215                 }
2216                 $this->addScript( Html::inlineScript( 'var passwordSecurity=' . FormatJson::encode( $data ) ) );
2217                 $this->addModules( 'mediawiki.legacy.password' );
2218         }
2219
2220         public function showFatalError( $message ) {
2221                 $this->setPageTitle( wfMsg( 'internalerror' ) );
2222                 $this->setRobotPolicy( 'noindex,nofollow' );
2223                 $this->setArticleRelated( false );
2224                 $this->enableClientCache( false );
2225                 $this->mRedirect = '';
2226                 $this->mBodytext = $message;
2227         }
2228
2229         public function showUnexpectedValueError( $name, $val ) {
2230                 $this->showFatalError( wfMsg( 'unexpected', $name, $val ) );
2231         }
2232
2233         public function showFileCopyError( $old, $new ) {
2234                 $this->showFatalError( wfMsg( 'filecopyerror', $old, $new ) );
2235         }
2236
2237         public function showFileRenameError( $old, $new ) {
2238                 $this->showFatalError( wfMsg( 'filerenameerror', $old, $new ) );
2239         }
2240
2241         public function showFileDeleteError( $name ) {
2242                 $this->showFatalError( wfMsg( 'filedeleteerror', $name ) );
2243         }
2244
2245         public function showFileNotFoundError( $name ) {
2246                 $this->showFatalError( wfMsg( 'filenotfound', $name ) );
2247         }
2248
2249         /**
2250          * Add a "return to" link pointing to a specified title
2251          *
2252          * @param $title Title to link
2253          * @param $query String: query string
2254          * @param $text String text of the link (input is not escaped)
2255          */
2256         public function addReturnTo( $title, $query = array(), $text = null ) {
2257                 global $wgUser;
2258                 $this->addLink( array( 'rel' => 'next', 'href' => $title->getFullURL() ) );
2259                 $link = wfMsgHtml(
2260                         'returnto',
2261                         $wgUser->getSkin()->link( $title, $text, array(), $query )
2262                 );
2263                 $this->addHTML( "<p id=\"mw-returnto\">{$link}</p>\n" );
2264         }
2265
2266         /**
2267          * Add a "return to" link pointing to a specified title,
2268          * or the title indicated in the request, or else the main page
2269          *
2270          * @param $unused No longer used
2271          * @param $returnto Title or String to return to
2272          * @param $returntoquery String: query string for the return to link
2273          */
2274         public function returnToMain( $unused = null, $returnto = null, $returntoquery = null ) {
2275                 global $wgRequest;
2276
2277                 if ( $returnto == null ) {
2278                         $returnto = $wgRequest->getText( 'returnto' );
2279                 }
2280
2281                 if ( $returntoquery == null ) {
2282                         $returntoquery = $wgRequest->getText( 'returntoquery' );
2283                 }
2284
2285                 if ( $returnto === '' ) {
2286                         $returnto = Title::newMainPage();
2287                 }
2288
2289                 if ( is_object( $returnto ) ) {
2290                         $titleObj = $returnto;
2291                 } else {
2292                         $titleObj = Title::newFromText( $returnto );
2293                 }
2294                 if ( !is_object( $titleObj ) ) {
2295                         $titleObj = Title::newMainPage();
2296                 }
2297
2298                 $this->addReturnTo( $titleObj, $returntoquery );
2299         }
2300
2301         /**
2302          * @param $sk Skin The given Skin
2303          * @param $includeStyle Boolean: unused
2304          * @return String: The doctype, opening <html>, and head element.
2305          */
2306         public function headElement( Skin $sk, $includeStyle = true ) {
2307                 global $wgOutputEncoding, $wgMimeType;
2308                 global $wgUseTrackbacks, $wgHtml5;
2309                 global $wgUser, $wgRequest, $wgLang;
2310
2311                 if ( $sk->commonPrintStylesheet() ) {
2312                         $this->addModuleStyles( 'mediawiki.legacy.wikiprintable' );
2313                 }
2314                 $sk->setupUserCss( $this );
2315
2316                 $lang = wfUILang();
2317                 $ret = Html::htmlHeader( array( 'lang' => $lang->getCode(), 'dir' => $lang->getDir() ) );
2318
2319                 if ( $this->getHTMLTitle() == '' ) {
2320                         $this->setHTMLTitle( wfMsg( 'pagetitle', $this->getPageTitle() ) );
2321                 }
2322
2323                 $openHead = Html::openElement( 'head' );
2324                 if ( $openHead ) {
2325                         # Don't bother with the newline if $head == ''
2326                         $ret .= "$openHead\n";
2327                 }
2328
2329                 if ( $wgHtml5 ) {
2330                         # More succinct than <meta http-equiv=Content-Type>, has the
2331                         # same effect
2332                         $ret .= Html::element( 'meta', array( 'charset' => $wgOutputEncoding ) ) . "\n";
2333                 } else {
2334                         $this->addMeta( 'http:Content-Type', "$wgMimeType; charset=$wgOutputEncoding" );
2335                 }
2336
2337                 $ret .= Html::element( 'title', null, $this->getHTMLTitle() ) . "\n";
2338
2339                 $ret .= implode( "\n", array(
2340                         $this->getHeadLinks( $sk ),
2341                         $this->buildCssLinks( $sk ),
2342                         $this->getHeadItems()
2343                 ) );
2344
2345                 if ( $wgUseTrackbacks && $this->isArticleRelated() ) {
2346                         $ret .= $this->getTitle()->trackbackRDF();
2347                 }
2348
2349                 $closeHead = Html::closeElement( 'head' );
2350                 if ( $closeHead ) {
2351                         $ret .= "$closeHead\n";
2352                 }
2353
2354                 $bodyAttrs = array();
2355
2356                 # Crazy edit-on-double-click stuff
2357                 $action = $wgRequest->getVal( 'action', 'view' );
2358
2359                 if (
2360                         $this->getTitle()->getNamespace() != NS_SPECIAL &&
2361                         !in_array( $action, array( 'edit', 'submit' ) ) &&
2362                         $wgUser->getOption( 'editondblclick' )
2363                 )
2364                 {
2365                         $bodyAttrs['ondblclick'] = "document.location = '" . Xml::escapeJsString( $this->getTitle()->getEditURL() ) . "'";
2366                 }
2367
2368                 # Class bloat
2369                 $dir = wfUILang()->getDir();
2370                 $bodyAttrs['class'] = "mediawiki $dir";
2371
2372                 if ( $wgLang->capitalizeAllNouns() ) {
2373                         # A <body> class is probably not the best way to do this . . .
2374                         $bodyAttrs['class'] .= ' capitalize-all-nouns';
2375                 }
2376                 $bodyAttrs['class'] .= ' ' . $sk->getPageClasses( $this->getTitle() );
2377                 $bodyAttrs['class'] .= ' skin-' . Sanitizer::escapeClass( $sk->getSkinName() );
2378
2379                 $sk->addToBodyAttributes( $this, $bodyAttrs ); // Allow skins to add body attributes they need
2380                 wfRunHooks( 'OutputPageBodyAttributes', array( $this, $sk, &$bodyAttrs ) );
2381
2382                 $ret .= Html::openElement( 'body', $bodyAttrs ) . "\n";
2383
2384                 return $ret;
2385         }
2386
2387         /**
2388          * Get a ResourceLoader object associated with this OutputPage
2389          *
2390          * @return ResourceLoader
2391          */
2392         public function getResourceLoader() {
2393                 if ( is_null( $this->mResourceLoader ) ) {
2394                         $this->mResourceLoader = new ResourceLoader();
2395                 }
2396                 return $this->mResourceLoader;
2397         }
2398
2399         /**
2400          * TODO: Document
2401          * @param $skin Skin
2402          * @param $modules Array/string with the module name
2403          * @param $only String ResourceLoaderModule TYPE_ class constant
2404          * @param $useESI boolean
2405          * @return string html <script> and <style> tags
2406          */
2407         protected function makeResourceLoaderLink( Skin $skin, $modules, $only, $useESI = false ) {
2408                 global $wgUser, $wgLang, $wgLoadScript, $wgResourceLoaderUseESI,
2409                         $wgResourceLoaderInlinePrivateModules, $wgRequest;
2410                 // Lazy-load ResourceLoader
2411                 // TODO: Should this be a static function of ResourceLoader instead?
2412                 // TODO: Divide off modules starting with "user", and add the user parameter to them
2413                 $baseQuery = array(
2414                         'lang' => $wgLang->getCode(),
2415                         'debug' => ResourceLoader::inDebugMode() ? 'true' : 'false',
2416                         'skin' => $skin->getSkinName(),
2417                         'only' => $only,
2418                 );
2419                 // Propagate printable and handheld parameters if present
2420                 if ( $this->isPrintable() ) {
2421                         $baseQuery['printable'] = 1;
2422                 }
2423                 if ( $wgRequest->getBool( 'handheld' ) ) {
2424                         $baseQuery['handheld'] = 1;
2425                 }
2426
2427                 if ( !count( $modules ) ) {
2428                         return '';
2429                 }
2430
2431                 if ( count( $modules ) > 1 ) {
2432                         // Remove duplicate module requests
2433                         $modules = array_unique( (array) $modules );
2434                         // Sort module names so requests are more uniform
2435                         sort( $modules );
2436
2437                         if ( ResourceLoader::inDebugMode() ) {
2438                                 // Recursively call us for every item
2439                                 $links = '';
2440                                 foreach ( $modules as $name ) {
2441                                         $links .= $this->makeResourceLoaderLink( $skin, $name, $only, $useESI );
2442                                 }
2443                                 return $links;
2444                         }
2445                 }
2446
2447                 // Create keyed-by-group list of module objects from modules list
2448                 $groups = array();
2449                 $resourceLoader = $this->getResourceLoader();
2450                 foreach ( (array) $modules as $name ) {
2451                         $module = $resourceLoader->getModule( $name );
2452                         # Check that we're allowed to include this module on this page
2453                         if ( ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_SCRIPTS )
2454                                         && $only == ResourceLoaderModule::TYPE_SCRIPTS )
2455                                 || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_STYLES )
2456                                         && $only == ResourceLoaderModule::TYPE_STYLES )
2457                                 )
2458                         {
2459                                 continue;
2460                         }
2461
2462                         $group = $module->getGroup();
2463                         if ( !isset( $groups[$group] ) ) {
2464                                 $groups[$group] = array();
2465                         }
2466                         $groups[$group][$name] = $module;
2467                 }
2468
2469                 $links = '';
2470                 foreach ( $groups as $group => $modules ) {
2471                         $query = $baseQuery;
2472                         // Special handling for user-specific groups
2473                         if ( ( $group === 'user' || $group === 'private' ) && $wgUser->isLoggedIn() ) {
2474                                 $query['user'] = $wgUser->getName();
2475                         }
2476
2477                         // Create a fake request based on the one we are about to make so modules return
2478                         // correct timestamp and emptiness data
2479                         $context = new ResourceLoaderContext( $resourceLoader, new FauxRequest( $query ) );
2480                         // Drop modules that know they're empty
2481                         foreach ( $modules as $key => $module ) {
2482                                 if ( $module->isKnownEmpty( $context ) ) {
2483                                         unset( $modules[$key] );
2484                                 }
2485                         }
2486                         // If there are no modules left, skip this group
2487                         if ( $modules === array() ) {
2488                                 continue;
2489                         }
2490
2491                         $query['modules'] = implode( '|', array_keys( $modules ) );
2492
2493                         // Support inlining of private modules if configured as such
2494                         if ( $group === 'private' && $wgResourceLoaderInlinePrivateModules ) {
2495                                 if ( $only == ResourceLoaderModule::TYPE_STYLES ) {
2496                                         $links .= Html::inlineStyle(
2497                                                 $resourceLoader->makeModuleResponse( $context, $modules )
2498                                         );
2499                                 } else {
2500                                         $links .= Html::inlineScript(
2501                                                 ResourceLoader::makeLoaderConditionalScript(
2502                                                         $resourceLoader->makeModuleResponse( $context, $modules )
2503                                                 )
2504                                         );
2505                                 }
2506                                 continue;
2507                         }
2508                         // Special handling for user and site groups; because users might change their stuff
2509                         // on-wiki like site or user pages, or user preferences; we need to find the highest
2510                         // timestamp of these user-changable modules so we can ensure cache misses on change
2511                         if ( $group === 'user' || $group === 'site' ) {
2512                                 // Get the maximum timestamp
2513                                 $timestamp = 1;
2514                                 foreach ( $modules as $module ) {
2515                                         $timestamp = max( $timestamp, $module->getModifiedTime( $context ) );
2516                                 }
2517                                 // Add a version parameter so cache will break when things change
2518                                 $query['version'] = wfTimestamp( TS_ISO_8601_BASIC, $timestamp );
2519                         }
2520                         // Make queries uniform in order
2521                         ksort( $query );
2522
2523                         $url = wfAppendQuery( $wgLoadScript, $query );
2524                         if ( $useESI && $wgResourceLoaderUseESI ) {
2525                                 $esi = Xml::element( 'esi:include', array( 'src' => $url ) );
2526                                 if ( $only == ResourceLoaderModule::TYPE_STYLES ) {
2527                                         $link = Html::inlineStyle( $esi );
2528                                 } else {
2529                                         $link = Html::inlineScript( $esi );
2530                                 }
2531                         } else {
2532                                 // Automatically select style/script elements
2533                                 if ( $only === ResourceLoaderModule::TYPE_STYLES ) {
2534                                         $link = Html::linkedStyle( wfAppendQuery( $wgLoadScript, $query ) );
2535                                 } else {
2536                                         $link = Html::linkedScript( wfAppendQuery( $wgLoadScript, $query ) );
2537                                 }
2538                         }
2539
2540                         if( $group == 'noscript' ){
2541                                 $links .= Html::rawElement( 'noscript', array(), $link ) . "\n";
2542                         } else {
2543                                 $links .= $link . "\n";
2544                         }
2545                 }
2546                 return $links;
2547         }
2548
2549         /**
2550          * Gets the global variables and mScripts; also adds userjs to the end if
2551          * enabled. Despite the name, these scripts are no longer put in the
2552          * <head> but at the bottom of the <body>
2553          *
2554          * @param $sk Skin object to use
2555          * @return String: HTML fragment
2556          */
2557         function getHeadScripts( Skin $sk ) {
2558                 global $wgUser, $wgRequest, $wgUseSiteJs, $wgAllowUserJs;
2559
2560                 // Startup - this will immediately load jquery and mediawiki modules
2561                 $scripts = $this->makeResourceLoaderLink( $sk, 'startup', ResourceLoaderModule::TYPE_SCRIPTS, true );
2562
2563                 // Script and Messages "only" requests
2564                 $scripts .= $this->makeResourceLoaderLink( $sk, $this->getModuleScripts( true ), ResourceLoaderModule::TYPE_SCRIPTS );
2565                 $scripts .= $this->makeResourceLoaderLink( $sk, $this->getModuleMessages( true ), ResourceLoaderModule::TYPE_MESSAGES );
2566
2567                 // Modules requests - let the client calculate dependencies and batch requests as it likes
2568                 $loader = '';
2569                 if ( $this->getModules( true ) ) {
2570                         $loader = Xml::encodeJsCall( 'mw.loader.load', array( $this->getModules( true ) ) ) .
2571                                 Xml::encodeJsCall( 'mw.loader.go', array() );
2572                 }
2573
2574                 $scripts .= Html::inlineScript(
2575                         ResourceLoader::makeLoaderConditionalScript(
2576                                 ResourceLoader::makeConfigSetScript( $this->getJSVars() ) . $loader
2577                         )
2578                 );
2579
2580                 // Legacy Scripts
2581                 $scripts .= "\n" . $this->mScripts;
2582
2583                 $userScripts = array( 'user.options' );
2584
2585                 // Add site JS if enabled
2586                 if ( $wgUseSiteJs ) {
2587                         $scripts .= $this->makeResourceLoaderLink( $sk, 'site', ResourceLoaderModule::TYPE_SCRIPTS );
2588                         if( $wgUser->isLoggedIn() ){
2589                                 $userScripts[] = 'user.groups';
2590                         }
2591                 }
2592
2593                 // Add user JS if enabled
2594                 if ( $wgAllowUserJs && $wgUser->isLoggedIn() ) {
2595                         $action = $wgRequest->getVal( 'action', 'view' );
2596                         if( $this->mTitle && $this->mTitle->isJsSubpage() && $sk->userCanPreview( $action ) ) {
2597                                 # XXX: additional security check/prompt?
2598                                 $scripts .= Html::inlineScript( "\n" . $wgRequest->getText( 'wpTextbox1' ) . "\n" ) . "\n";
2599                         } else {
2600                                 # FIXME: this means that User:Me/Common.js doesn't load when previewing
2601                                 # User:Me/Vector.js, and vice versa (bug26283)
2602                                 $userScripts[] = 'user';
2603                         }
2604                 }
2605                 $scripts .= $this->makeResourceLoaderLink( $sk, $userScripts, ResourceLoaderModule::TYPE_SCRIPTS );
2606
2607                 return $scripts;
2608         }
2609
2610         /**
2611          * Get an array containing global JS variables
2612          *
2613          * Do not add things here which can be evaluated in
2614          * ResourceLoaderStartupScript - in other words, without state.
2615          * You will only be adding bloat to the page and causing page caches to
2616          * have to be purged on configuration changes.
2617          */
2618         protected function getJSVars() {
2619                 global $wgUser, $wgRequest, $wgUseAjax, $wgEnableMWSuggest, $wgContLang;
2620
2621                 $title = $this->getTitle();
2622                 $ns = $title->getNamespace();
2623                 $nsname = MWNamespace::exists( $ns ) ? MWNamespace::getCanonicalName( $ns ) : $title->getNsText();
2624                 if ( $ns == NS_SPECIAL ) {
2625                         $parts = SpecialPage::resolveAliasWithSubpage( $title->getDBkey() );
2626                         $canonicalName = $parts[0];
2627                 } else {
2628                         $canonicalName = false; # bug 21115
2629                 }
2630
2631                 $vars = array(
2632                         'wgCanonicalNamespace' => $nsname,
2633                         'wgCanonicalSpecialPageName' => $canonicalName,
2634                         'wgNamespaceNumber' => $title->getNamespace(),
2635                         'wgPageName' => $title->getPrefixedDBKey(),
2636                         'wgTitle' => $title->getText(),
2637                         'wgCurRevisionId' => $title->getLatestRevID(),
2638                         'wgArticleId' => $title->getArticleId(),
2639                         'wgIsArticle' => $this->isArticle(),
2640                         'wgAction' => $wgRequest->getText( 'action', 'view' ),
2641                         'wgUserName' => $wgUser->isAnon() ? null : $wgUser->getName(),
2642                         'wgUserGroups' => $wgUser->getEffectiveGroups(),
2643                         'wgCategories' => $this->getCategories(),
2644                         'wgBreakFrames' => $this->getFrameOptions() == 'DENY',
2645                 );
2646                 if ( $wgContLang->hasVariants() ) {
2647                         $vars['wgUserVariant'] = $wgContLang->getPreferredVariant();
2648                 }
2649                 foreach ( $title->getRestrictionTypes() as $type ) {
2650                         $vars['wgRestriction' . ucfirst( $type )] = $title->getRestrictions( $type );
2651                 }
2652                 if ( $wgUseAjax && $wgEnableMWSuggest && !$wgUser->getOption( 'disablesuggest', false ) ) {
2653                         $vars['wgSearchNamespaces'] = SearchEngine::userNamespaces( $wgUser );
2654                 }
2655
2656                 // Allow extensions to add their custom variables to the global JS variables
2657                 wfRunHooks( 'MakeGlobalVariablesScript', array( &$vars ) );
2658
2659                 return $vars;
2660         }
2661
2662         /**
2663          * Add default \<meta\> tags
2664          */
2665         protected function addDefaultMeta() {
2666                 global $wgVersion, $wgHtml5;
2667
2668                 static $called = false;
2669                 if ( $called ) {
2670                         # Don't run this twice
2671                         return;
2672                 }
2673                 $called = true;
2674
2675                 if ( !$wgHtml5 ) {
2676                         $this->addMeta( 'http:Content-Style-Type', 'text/css' ); // bug 15835
2677                 }
2678                 $this->addMeta( 'generator', "MediaWiki $wgVersion" );
2679
2680                 $p = "{$this->mIndexPolicy},{$this->mFollowPolicy}";
2681                 if( $p !== 'index,follow' ) {
2682                         // http://www.robotstxt.org/wc/meta-user.html
2683                         // Only show if it's different from the default robots policy
2684                         $this->addMeta( 'robots', $p );
2685                 }
2686
2687                 if ( count( $this->mKeywords ) > 0 ) {
2688                         $strip = array(
2689                                 "/<.*?" . ">/" => '',
2690                                 "/_/" => ' '
2691                         );
2692                         $this->addMeta(
2693                                 'keywords',
2694                                 preg_replace(
2695                                         array_keys( $strip ),
2696                                         array_values( $strip ),
2697                                         implode( ',', $this->mKeywords )
2698                                 )
2699                         );
2700                 }
2701         }
2702
2703         /**
2704          * @return string HTML tag links to be put in the header.
2705          */
2706         public function getHeadLinks( Skin $sk ) {
2707                 global $wgFeed;
2708
2709                 // Ideally this should happen earlier, somewhere. :P
2710                 $this->addDefaultMeta();
2711
2712                 $tags = array();
2713
2714                 foreach ( $this->mMetatags as $tag ) {
2715                         if ( 0 == strcasecmp( 'http:', substr( $tag[0], 0, 5 ) ) ) {
2716                                 $a = 'http-equiv';
2717                                 $tag[0] = substr( $tag[0], 5 );
2718                         } else {
2719                                 $a = 'name';
2720                         }
2721                         $tags[] = Html::element( 'meta',
2722                                 array(
2723                                         $a => $tag[0],
2724                                         'content' => $tag[1]
2725                                 )
2726                         );
2727                 }
2728                 foreach ( $this->mLinktags as $tag ) {
2729                         $tags[] = Html::element( 'link', $tag );
2730                 }
2731
2732                 if( $wgFeed ) {
2733                         foreach( $this->getSyndicationLinks() as $format => $link ) {
2734                                 # Use the page name for the title (accessed through $wgTitle since
2735                                 # there's no other way).  In principle, this could lead to issues
2736                                 # with having the same name for different feeds corresponding to
2737                                 # the same page, but we can't avoid that at this low a level.
2738
2739                                 $tags[] = $this->feedLink(
2740                                         $format,
2741                                         $link,
2742                                         # Used messages: 'page-rss-feed' and 'page-atom-feed' (for an easier grep)
2743                                         wfMsg( "page-{$format}-feed", $this->getTitle()->getPrefixedText() )
2744                                 );
2745                         }
2746
2747                         # Recent changes feed should appear on every page (except recentchanges,
2748                         # that would be redundant). Put it after the per-page feed to avoid
2749                         # changing existing behavior. It's still available, probably via a
2750                         # menu in your browser. Some sites might have a different feed they'd
2751                         # like to promote instead of the RC feed (maybe like a "Recent New Articles"
2752                         # or "Breaking news" one). For this, we see if $wgOverrideSiteFeed is defined.
2753                         # If so, use it instead.
2754
2755                         global $wgOverrideSiteFeed, $wgSitename, $wgAdvertisedFeedTypes;
2756                         $rctitle = SpecialPage::getTitleFor( 'Recentchanges' );
2757
2758                         if ( $wgOverrideSiteFeed ) {
2759                                 foreach ( $wgOverrideSiteFeed as $type => $feedUrl ) {
2760                                         $tags[] = $this->feedLink(
2761                                                 $type,
2762                                                 htmlspecialchars( $feedUrl ),
2763                                                 wfMsg( "site-{$type}-feed", $wgSitename )
2764                                         );
2765                                 }
2766                         } elseif ( $this->getTitle()->getPrefixedText() != $rctitle->getPrefixedText() ) {
2767                                 foreach ( $wgAdvertisedFeedTypes as $format ) {
2768                                         $tags[] = $this->feedLink(
2769                                                 $format,
2770                                                 $rctitle->getLocalURL( "feed={$format}" ),
2771                                                 wfMsg( "site-{$format}-feed", $wgSitename ) # For grep: 'site-rss-feed', 'site-atom-feed'.
2772                                         );
2773                                 }
2774                         }
2775                 }
2776                 return implode( "\n", $tags );
2777         }
2778
2779         /**
2780          * Generate a <link rel/> for a feed.
2781          *
2782          * @param $type String: feed type
2783          * @param $url String: URL to the feed
2784          * @param $text String: value of the "title" attribute
2785          * @return String: HTML fragment
2786          */
2787         private function feedLink( $type, $url, $text ) {
2788                 return Html::element( 'link', array(
2789                         'rel' => 'alternate',
2790                         'type' => "application/$type+xml",
2791                         'title' => $text,
2792                         'href' => $url )
2793                 );
2794         }
2795
2796         /**
2797          * Add a local or specified stylesheet, with the given media options.
2798          * Meant primarily for internal use...
2799          *
2800          * @param $style String: URL to the file
2801          * @param $media String: to specify a media type, 'screen', 'printable', 'handheld' or any.
2802          * @param $condition String: for IE conditional comments, specifying an IE version
2803          * @param $dir String: set to 'rtl' or 'ltr' for direction-specific sheets
2804          */
2805         public function addStyle( $style, $media = '', $condition = '', $dir = '' ) {
2806                 $options = array();
2807                 // Even though we expect the media type to be lowercase, but here we
2808                 // force it to lowercase to be safe.
2809                 if( $media ) {
2810                         $options['media'] = $media;
2811                 }
2812                 if( $condition ) {
2813                         $options['condition'] = $condition;
2814                 }
2815                 if( $dir ) {
2816                         $options['dir'] = $dir;
2817                 }
2818                 $this->styles[$style] = $options;
2819         }
2820
2821         /**
2822          * Adds inline CSS styles
2823          * @param $style_css Mixed: inline CSS
2824          */
2825         public function addInlineStyle( $style_css ){
2826                 $this->mInlineStyles .= Html::inlineStyle( $style_css );
2827         }
2828
2829         /**
2830          * Build a set of <link>s for the stylesheets specified in the $this->styles array.
2831          * These will be applied to various media & IE conditionals.
2832          * @param $sk Skin object
2833          */
2834         public function buildCssLinks( $sk ) {
2835                 $ret = '';
2836                 // Add ResourceLoader styles
2837                 // Split the styles into four groups
2838                 $styles = array( 'other' => array(), 'user' => array(), 'site' => array(), 'private' => array(), 'noscript' => array() );
2839                 $resourceLoader = $this->getResourceLoader();
2840                 foreach ( $this->getModuleStyles() as $name ) {
2841                         $group = $resourceLoader->getModule( $name )->getGroup();
2842                         // Modules in groups named "other" or anything different than "user", "site" or "private"
2843                         // will be placed in the "other" group
2844                         $styles[isset( $styles[$group] ) ? $group : 'other'][] = $name;
2845                 }
2846
2847                 // We want site, private and user styles to override dynamically added styles from modules, but we want
2848                 // dynamically added styles to override statically added styles from other modules. So the order
2849                 // has to be other, dynamic, site, private, user
2850                 // Add statically added styles for other modules
2851                 $ret .= $this->makeResourceLoaderLink( $sk, $styles['other'], ResourceLoaderModule::TYPE_STYLES );
2852                 // Add normal styles added through addStyle()/addInlineStyle() here
2853                 $ret .= implode( "\n", $this->buildCssLinksArray() ) . $this->mInlineStyles;
2854                 // Add marker tag to mark the place where the client-side loader should inject dynamic styles
2855                 // We use a <meta> tag with a made-up name for this because that's valid HTML
2856                 $ret .= Html::element( 'meta', array( 'name' => 'ResourceLoaderDynamicStyles', 'content' => '' ) ) . "\n";
2857
2858                 // Add site, private and user styles
2859                 // 'private' at present only contains user.options, so put that before 'user'
2860                 // Any future private modules will likely have a similar user-specific character
2861                 foreach ( array( 'site', 'noscript', 'private', 'user' ) as $group ) {
2862                         $ret .= $this->makeResourceLoaderLink( $sk, $styles[$group],
2863                                         ResourceLoaderModule::TYPE_STYLES
2864                         );
2865                 }
2866                 return $ret;
2867         }
2868
2869         public function buildCssLinksArray() {
2870                 $links = array();
2871                 foreach( $this->styles as $file => $options ) {
2872                         $link = $this->styleLink( $file, $options );
2873                         if( $link ) {
2874                                 $links[$file] = $link;
2875                         }
2876                 }
2877                 return $links;
2878         }
2879
2880         /**
2881          * Generate \<link\> tags for stylesheets
2882          *
2883          * @param $style String: URL to the file
2884          * @param $options Array: option, can contain 'condition', 'dir', 'media'
2885          *                 keys
2886          * @return String: HTML fragment
2887          */
2888         protected function styleLink( $style, $options ) {
2889                 if( isset( $options['dir'] ) ) {
2890                         $siteDir = wfUILang()->getDir();
2891                         if( $siteDir != $options['dir'] ) {
2892                                 return '';
2893                         }
2894                 }
2895
2896                 if( isset( $options['media'] ) ) {
2897                         $media = self::transformCssMedia( $options['media'] );
2898                         if( is_null( $media ) ) {
2899                                 return '';
2900                         }
2901                 } else {
2902                         $media = 'all';
2903                 }
2904
2905                 if( substr( $style, 0, 1 ) == '/' ||
2906                         substr( $style, 0, 5 ) == 'http:' ||
2907                         substr( $style, 0, 6 ) == 'https:' ) {
2908                         $url = $style;
2909                 } else {
2910                         global $wgStylePath, $wgStyleVersion;
2911                         $url = $wgStylePath . '/' . $style . '?' . $wgStyleVersion;
2912                 }
2913
2914                 $link = Html::linkedStyle( $url, $media );
2915
2916                 if( isset( $options['condition'] ) ) {
2917                         $condition = htmlspecialchars( $options['condition'] );
2918                         $link = "<!--[if $condition]>$link<![endif]-->";
2919                 }
2920                 return $link;
2921         }
2922
2923         /**
2924          * Transform "media" attribute based on request parameters
2925          *
2926          * @param $media String: current value of the "media" attribute
2927          * @return String: modified value of the "media" attribute
2928          */
2929         public static function transformCssMedia( $media ) {
2930                 global $wgRequest, $wgHandheldForIPhone;
2931
2932                 // Switch in on-screen display for media testing
2933                 $switches = array(
2934                         'printable' => 'print',
2935                         'handheld' => 'handheld',
2936                 );
2937                 foreach( $switches as $switch => $targetMedia ) {
2938                         if( $wgRequest->getBool( $switch ) ) {
2939                                 if( $media == $targetMedia ) {
2940                                         $media = '';
2941                                 } elseif( $media == 'screen' ) {
2942                                         return null;
2943                                 }
2944                         }
2945                 }
2946
2947                 // Expand longer media queries as iPhone doesn't grok 'handheld'
2948                 if( $wgHandheldForIPhone ) {
2949                         $mediaAliases = array(
2950                                 'screen' => 'screen and (min-device-width: 481px)',
2951                                 'handheld' => 'handheld, only screen and (max-device-width: 480px)',
2952                         );
2953
2954                         if( isset( $mediaAliases[$media] ) ) {
2955                                 $media = $mediaAliases[$media];
2956                         }
2957                 }
2958
2959                 return $media;
2960         }
2961
2962         /**
2963          * Turn off regular page output and return an error reponse
2964          * for when rate limiting has triggered.
2965          */
2966         public function rateLimited() {
2967                 $this->setPageTitle( wfMsg( 'actionthrottled' ) );
2968                 $this->setRobotPolicy( 'noindex,follow' );
2969                 $this->setArticleRelated( false );
2970                 $this->enableClientCache( false );
2971                 $this->mRedirect = '';
2972                 $this->clearHTML();
2973                 $this->setStatusCode( 503 );
2974                 $this->addWikiMsg( 'actionthrottledtext' );
2975
2976                 $this->returnToMain( null, $this->getTitle() );
2977         }
2978
2979         /**
2980          * Show a warning about slave lag
2981          *
2982          * If the lag is higher than $wgSlaveLagCritical seconds,
2983          * then the warning is a bit more obvious. If the lag is
2984          * lower than $wgSlaveLagWarning, then no warning is shown.
2985          *
2986          * @param $lag Integer: slave lag
2987          */
2988         public function showLagWarning( $lag ) {
2989                 global $wgSlaveLagWarning, $wgSlaveLagCritical, $wgLang;
2990                 if( $lag >= $wgSlaveLagWarning ) {
2991                         $message = $lag < $wgSlaveLagCritical
2992                                 ? 'lag-warn-normal'
2993                                 : 'lag-warn-high';
2994                         $wrap = Html::rawElement( 'div', array( 'class' => "mw-{$message}" ), "\n$1\n" );
2995                         $this->wrapWikiMsg( "$wrap\n", array( $message, $wgLang->formatNum( $lag ) ) );
2996                 }
2997         }
2998
2999         /**
3000          * Add a wikitext-formatted message to the output.
3001          * This is equivalent to:
3002          *
3003          *    $wgOut->addWikiText( wfMsgNoTrans( ... ) )
3004          */
3005         public function addWikiMsg( /*...*/ ) {
3006                 $args = func_get_args();
3007                 $name = array_shift( $args );
3008                 $this->addWikiMsgArray( $name, $args );
3009         }
3010
3011         /**
3012          * Add a wikitext-formatted message to the output.
3013          * Like addWikiMsg() except the parameters are taken as an array
3014          * instead of a variable argument list.
3015          *
3016          * $options is passed through to wfMsgExt(), see that function for details.
3017          */
3018         public function addWikiMsgArray( $name, $args, $options = array() ) {
3019                 $options[] = 'parse';
3020                 $text = wfMsgExt( $name, $options, $args );
3021                 $this->addHTML( $text );
3022         }
3023
3024         /**
3025          * This function takes a number of message/argument specifications, wraps them in
3026          * some overall structure, and then parses the result and adds it to the output.
3027          *
3028          * In the $wrap, $1 is replaced with the first message, $2 with the second, and so
3029          * on. The subsequent arguments may either be strings, in which case they are the
3030          * message names, or arrays, in which case the first element is the message name,
3031          * and subsequent elements are the parameters to that message.
3032          *
3033          * The special named parameter 'options' in a message specification array is passed
3034          * through to the $options parameter of wfMsgExt().
3035          *
3036          * Don't use this for messages that are not in users interface language.
3037          *
3038          * For example:
3039          *
3040          *    $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>", 'some-error' );
3041          *
3042          * Is equivalent to:
3043          *
3044          *    $wgOut->addWikiText( "<div class='error'>\n" . wfMsgNoTrans( 'some-error' ) . "\n</div>" );
3045          *
3046          * The newline after opening div is needed in some wikitext. See bug 19226.
3047          */
3048         public function wrapWikiMsg( $wrap /*, ...*/ ) {
3049                 $msgSpecs = func_get_args();
3050                 array_shift( $msgSpecs );
3051                 $msgSpecs = array_values( $msgSpecs );
3052                 $s = $wrap;
3053                 foreach ( $msgSpecs as $n => $spec ) {
3054                         $options = array();
3055                         if ( is_array( $spec ) ) {
3056                                 $args = $spec;
3057                                 $name = array_shift( $args );
3058                                 if ( isset( $args['options'] ) ) {
3059                                         $options = $args['options'];
3060                                         unset( $args['options'] );
3061                                 }
3062                         }  else {
3063                                 $args = array();
3064                                 $name = $spec;
3065                         }
3066                         $s = str_replace( '$' . ( $n + 1 ), wfMsgExt( $name, $options, $args ), $s );
3067                 }
3068                 $this->addWikiText( $s );
3069         }
3070
3071         /**
3072          * Include jQuery core. Use this to avoid loading it multiple times
3073          * before we get a usable script loader.
3074          *
3075          * @param $modules Array: list of jQuery modules which should be loaded
3076          * @return Array: the list of modules which were not loaded.
3077          * @since 1.16
3078          * @deprecated @since 1.17
3079          */
3080         public function includeJQuery( $modules = array() ) {
3081                 return array();
3082         }
3083
3084 }