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. Associative array mapping language code to the page name
  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         /** Initialized with a global value. Let us override it.
 128          *  Should probably get deleted / rewritten ... */
 129         var $mAllowUserJs;
 130
 131         /**
 132          * This was for the old skins and for users with 640x480 screen.
 133          * Please note old skins are still used and might prove useful for
 134          * users having old computers or visually impaired.
 135          */
 136         var $mSuppressQuickbar = false;
 137
 138         /**
 139          * @EasterEgg I just love the name for this self documenting variable.
 140          * @todo document
 141          */
 142         var $mDoNothing = false;
 143
 144         // Parser related.
 145         var $mContainsOldMagic = 0, $mContainsNewMagic = 0;
 146
 147         /**
 148          * Should be private. Has get/set methods properly documented.
 149          * Stores "article flag" toggle.
 150          */
 151         var $mIsArticleRelated = true;
 152
 153         /// lazy initialised, use parserOptions()
 154         protected $mParserOptions = null;
 155
 156         /**
 157          * Handles the atom / rss links.
 158          * We probably only support atom in 2011.
 159          * Looks like a private variable.
 160          * @see $wgAdvertisedFeedTypes
 161          */
 162         var $mFeedLinks = array();
 163
 164         // Gwicke work on squid caching? Roughly from 2003.
 165         var $mEnableClientCache = true;
 166
 167         /**
 168          * Flag if output should only contain the body of the article.
 169          * Should be private.
 170          */
 171         var $mArticleBodyOnly = false;
 172
 173         var $mNewSectionLink = false;
 174         var $mHideNewSectionLink = false;
 175
 176         /**
 177          * Comes from the parser. This was probably made to load CSS/JS only
 178          * if we had <gallery>. Used directly in CategoryPage.php
 179          * Looks like resource loader can replace this.
 180          */
 181         var $mNoGallery = false;
 182
 183         // should be private.
 184         var $mPageTitleActionText = '';
 185         var $mParseWarnings = array();
 186
 187         // Cache stuff. Looks like mEnableClientCache
 188         var $mSquidMaxage = 0;
 189
 190         // @todo document
 191         var $mPreventClickjacking = true;
 192
 193         /// should be private. To include the variable {{REVISIONID}}
 194         var $mRevisionId = null;
 195
 196         /// Stores a Title object (of the current page).
 197         protected $mTitle = null;
 198
 199         /**
 200          * An array of stylesheet filenames (relative from skins path), with options
 201          * for CSS media, IE conditions, and RTL/LTR direction.
 202          * For internal use; add settings in the skin via $this->addStyle()
 203          *
 204          * Style again! This seems like a code duplication since we already have
 205          * mStyles. This is what makes OpenSource amazing.
 206          */
 207         var $styles = array();
 208
 209         /**
 210          * Whether jQuery is already handled.
 211          */
 212         protected $mJQueryDone = false;
 213
 214         private $mIndexPolicy = 'index';
 215         private $mFollowPolicy = 'follow';
 216         private $mVaryHeader = array(
 217                 'Accept-Encoding' => array( 'list-contains=gzip' ),
 218                 'Cookie' => null
 219         );
 220
 221         /**
 222          * Constructor
 223          * Initialise private variables
 224          */
 225         function __construct() {
 226                 global $wgAllowUserJs;
 227                 $this->mAllowUserJs = $wgAllowUserJs;
 228         }
 229
 230         /**
 231          * Redirect to $url rather than displaying the normal page
 232          *
 233          * @param $url String: URL
 234          * @param $responsecode String: HTTP status code
 235          */
 236         public function redirect( $url, $responsecode = '302' ) {
 237                 # Strip newlines as a paranoia check for header injection in PHP<5.1.2
 238                 $this->mRedirect = str_replace( "\n", '', $url );
 239                 $this->mRedirectCode = $responsecode;
 240         }
 241
 242         /**
 243          * Get the URL to redirect to, or an empty string if not redirect URL set
 244          *
 245          * @return String
 246          */
 247         public function getRedirect() {
 248                 return $this->mRedirect;
 249         }
 250
 251         /**
 252          * Set the HTTP status code to send with the output.
 253          *
 254          * @param $statusCode Integer
 255          */
 256         public function setStatusCode( $statusCode ) {
 257                 $this->mStatusCode = $statusCode;
 258         }
 259
 260         /**
 261          * Add a new <meta> tag
 262          * To add an http-equiv meta tag, precede the name with "http:"
 263          *
 264          * @param $name String tag name
 265          * @param $val String tag value
 266          */
 267         function addMeta( $name, $val ) {
 268                 array_push( $this->mMetatags, array( $name, $val ) );
 269         }
 270
 271         /**
 272          * Add a keyword or a list of keywords in the page header
 273          *
 274          * @param $text String or array of strings
 275          */
 276         function addKeyword( $text ) {
 277                 if( is_array( $text ) ) {
 278                         $this->mKeywords = array_merge( $this->mKeywords, $text );
 279                 } else {
 280                         array_push( $this->mKeywords, $text );
 281                 }
 282         }
 283
 284         /**
 285          * Add a new \<link\> tag to the page header
 286          *
 287          * @param $linkarr Array: associative array of attributes.
 288          */
 289         function addLink( $linkarr ) {
 290                 array_push( $this->mLinktags, $linkarr );
 291         }
 292
 293         /**
 294          * Add a new \<link\> with "rel" attribute set to "meta"
 295          *
 296          * @param $linkarr Array: associative array mapping attribute names to their
 297          *                 values, both keys and values will be escaped, and the
 298          *                 "rel" attribute will be automatically added
 299          */
 300         function addMetadataLink( $linkarr ) {
 301                 # note: buggy CC software only reads first "meta" link
 302                 static $haveMeta = false;
 303                 $linkarr['rel'] = $haveMeta ? 'alternate meta' : 'meta';
 304                 $this->addLink( $linkarr );
 305                 $haveMeta = true;
 306         }
 307
 308         /**
 309          * Add raw HTML to the list of scripts (including \<script\> tag, etc.)
 310          *
 311          * @param $script String: raw HTML
 312          */
 313         function addScript( $script ) {
 314                 $this->mScripts .= $script . "\n";
 315         }
 316
 317         /**
 318          * Register and add a stylesheet from an extension directory.
 319          *
 320          * @param $url String path to sheet.  Provide either a full url (beginning
 321          *             with 'http', etc) or a relative path from the document root
 322          *             (beginning with '/').  Otherwise it behaves identically to
 323          *             addStyle() and draws from the /skins folder.
 324          */
 325         public function addExtensionStyle( $url ) {
 326                 array_push( $this->mExtStyles, $url );
 327         }
 328
 329         /**
 330          * Get all styles added by extensions
 331          *
 332          * @return Array
 333          */
 334         function getExtStyle() {
 335                 return $this->mExtStyles;
 336         }
 337
 338         /**
 339          * Add a JavaScript file out of skins/common, or a given relative path.
 340          *
 341          * @param $file String: filename in skins/common or complete on-server path
 342          *              (/foo/bar.js)
 343          * @param $version String: style version of the file. Defaults to $wgStyleVersion
 344          */
 345         public function addScriptFile( $file, $version = null ) {
 346                 global $wgStylePath, $wgStyleVersion;
 347                 // See if $file parameter is an absolute URL or begins with a slash
 348                 if( substr( $file, 0, 1 ) == '/' || preg_match( '#^[a-z]*://#i', $file ) ) {
 349                         $path = $file;
 350                 } else {
 351                         $path = "{$wgStylePath}/common/{$file}";
 352                 }
 353                 if ( is_null( $version ) )
 354                         $version = $wgStyleVersion;
 355                 $this->addScript( Html::linkedScript( wfAppendQuery( $path, $version ) ) );
 356         }
 357
 358         /**
 359          * Add a self-contained script tag with the given contents
 360          *
 361          * @param $script String: JavaScript text, no <script> tags
 362          */
 363         public function addInlineScript( $script ) {
 364                 $this->mScripts .= Html::inlineScript( "\n$script\n" ) . "\n";
 365         }
 366
 367         /**
 368          * Get all registered JS and CSS tags for the header.
 369          *
 370          * @return String
 371          */
 372         function getScript() {
 373                 return $this->mScripts . $this->getHeadItems();
 374         }
 375
 376         /**
 377          * Get the list of modules to include on this page
 378          *
 379          * @return Array of module names
 380          */
 381         public function getModules() {
 382                 return array_values( array_unique( $this->mModules ) );
 383         }
 384
 385         /**
 386          * Add one or more modules recognized by the resource loader. Modules added
 387          * through this function will be loaded by the resource loader when the
 388          * page loads.
 389          *
 390          * @param $modules Mixed: module name (string) or array of module names
 391          */
 392         public function addModules( $modules ) {
 393                 $this->mModules = array_merge( $this->mModules, (array)$modules );
 394         }
 395
 396         /**
 397          * Get the list of module JS to include on this page
 398          * @return array of module names
 399          */
 400         public function getModuleScripts() {
 401                 return array_values( array_unique( $this->mModuleScripts ) );
 402         }
 403
 404         /**
 405          * Add only JS of one or more modules recognized by the resource loader. Module
 406          * scripts added through this function will be loaded by the resource loader when
 407          * the page loads.
 408          *
 409          * @param $modules Mixed: module name (string) or array of module names
 410          */
 411         public function addModuleScripts( $modules ) {
 412                 $this->mModuleScripts = array_merge( $this->mModuleScripts, (array)$modules );
 413         }
 414
 415         /**
 416          * Get the list of module CSS to include on this page
 417          *
 418          * @return Array of module names
 419          */
 420         public function getModuleStyles() {
 421                 return array_values( array_unique( $this->mModuleStyles ) );
 422         }
 423
 424         /**
 425          * Add only CSS of one or more modules recognized by the resource loader. Module
 426          * styles added through this function will be loaded by the resource loader when
 427          * the page loads.
 428          *
 429          * @param $modules Mixed: module name (string) or array of module names
 430          */
 431         public function addModuleStyles( $modules ) {
 432                 $this->mModuleStyles = array_merge( $this->mModuleStyles, (array)$modules );
 433         }
 434
 435         /**
 436          * Get the list of module messages to include on this page
 437          *
 438          * @return Array of module names
 439          */
 440         public function getModuleMessages() {
 441                 return array_values( array_unique( $this->mModuleMessages ) );
 442         }
 443
 444         /**
 445          * Add only messages of one or more modules recognized by the resource loader.
 446          * Module messages added through this function will be loaded by the resource
 447          * loader when the page loads.
 448          *
 449          * @param $modules Mixed: module name (string) or array of module names
 450          */
 451         public function addModuleMessages( $modules ) {
 452                 $this->mModuleMessages = array_merge( $this->mModuleMessages, (array)$modules );
 453         }
 454
 455         /**
 456          * Get all header items in a string
 457          *
 458          * @return String
 459          */
 460         function getHeadItems() {
 461                 $s = '';
 462                 foreach ( $this->mHeadItems as $item ) {
 463                         $s .= $item;
 464                 }
 465                 return $s;
 466         }
 467
 468         /**
 469          * Add or replace an header item to the output
 470          *
 471          * @param $name String: item name
 472          * @param $value String: raw HTML
 473          */
 474         public function addHeadItem( $name, $value ) {
 475                 $this->mHeadItems[$name] = $value;
 476         }
 477
 478         /**
 479          * Check if the header item $name is already set
 480          *
 481          * @param $name String: item name
 482          * @return Boolean
 483          */
 484         public function hasHeadItem( $name ) {
 485                 return isset( $this->mHeadItems[$name] );
 486         }
 487
 488         /**
 489          * Set the value of the ETag HTTP header, only used if $wgUseETag is true
 490          *
 491          * @param $tag String: value of "ETag" header
 492          */
 493         function setETag( $tag ) {
 494                 $this->mETag = $tag;
 495         }
 496
 497         /**
 498          * Set whether the output should only contain the body of the article,
 499          * without any skin, sidebar, etc.
 500          * Used e.g. when calling with "action=render".
 501          *
 502          * @param $only Boolean: whether to output only the body of the article
 503          */
 504         public function setArticleBodyOnly( $only ) {
 505                 $this->mArticleBodyOnly = $only;
 506         }
 507
 508         /**
 509          * Return whether the output will contain only the body of the article
 510          *
 511          * @return Boolean
 512          */
 513         public function getArticleBodyOnly() {
 514                 return $this->mArticleBodyOnly;
 515         }
 516
 517         /**
 518          * checkLastModified tells the client to use the client-cached page if
 519          * possible. If sucessful, the OutputPage is disabled so that
 520          * any future call to OutputPage->output() have no effect.
 521          *
 522          * Side effect: sets mLastModified for Last-Modified header
 523          *
 524          * @return Boolean: true iff cache-ok headers was sent.
 525          */
 526         public function checkLastModified( $timestamp ) {
 527                 global $wgCachePages, $wgCacheEpoch, $wgUser, $wgRequest;
 528
 529                 if ( !$timestamp || $timestamp == '19700101000000' ) {
 530                         wfDebug( __METHOD__ . ": CACHE DISABLED, NO TIMESTAMP\n" );
 531                         return false;
 532                 }
 533                 if( !$wgCachePages ) {
 534                         wfDebug( __METHOD__ . ": CACHE DISABLED\n", false );
 535                         return false;
 536                 }
 537                 if( $wgUser->getOption( 'nocache' ) ) {
 538                         wfDebug( __METHOD__ . ": USER DISABLED CACHE\n", false );
 539                         return false;
 540                 }
 541
 542                 $timestamp = wfTimestamp( TS_MW, $timestamp );
 543                 $modifiedTimes = array(
 544                         'page' => $timestamp,
 545                         'user' => $wgUser->getTouched(),
 546                         'epoch' => $wgCacheEpoch
 547                 );
 548                 wfRunHooks( 'OutputPageCheckLastModified', array( &$modifiedTimes ) );
 549
 550                 $maxModified = max( $modifiedTimes );
 551                 $this->mLastModified = wfTimestamp( TS_RFC2822, $maxModified );
 552
 553                 if( empty( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) ) {
 554                         wfDebug( __METHOD__ . ": client did not send If-Modified-Since header\n", false );
 555                         return false;
 556                 }
 557
 558                 # Make debug info
 559                 $info = '';
 560                 foreach ( $modifiedTimes as $name => $value ) {
 561                         if ( $info !== '' ) {
 562                                 $info .= ', ';
 563                         }
 564                         $info .= "$name=" . wfTimestamp( TS_ISO_8601, $value );
 565                 }
 566
 567                 # IE sends sizes after the date like this:
 568                 # Wed, 20 Aug 2003 06:51:19 GMT; length=5202
 569                 # this breaks strtotime().
 570                 $clientHeader = preg_replace( '/;.*$/', '', $_SERVER["HTTP_IF_MODIFIED_SINCE"] );
 571
 572                 wfSuppressWarnings(); // E_STRICT system time bitching
 573                 $clientHeaderTime = strtotime( $clientHeader );
 574                 wfRestoreWarnings();
 575                 if ( !$clientHeaderTime ) {
 576                         wfDebug( __METHOD__ . ": unable to parse the client's If-Modified-Since header: $clientHeader\n" );
 577                         return false;
 578                 }
 579                 $clientHeaderTime = wfTimestamp( TS_MW, $clientHeaderTime );
 580
 581                 wfDebug( __METHOD__ . ": client sent If-Modified-Since: " .
 582                         wfTimestamp( TS_ISO_8601, $clientHeaderTime ) . "\n", false );
 583                 wfDebug( __METHOD__ . ": effective Last-Modified: " .
 584                         wfTimestamp( TS_ISO_8601, $maxModified ) . "\n", false );
 585                 if( $clientHeaderTime < $maxModified ) {
 586                         wfDebug( __METHOD__ . ": STALE, $info\n", false );
 587                         return false;
 588                 }
 589
 590                 # Not modified
 591                 # Give a 304 response code and disable body output
 592                 wfDebug( __METHOD__ . ": NOT MODIFIED, $info\n", false );
 593                 ini_set( 'zlib.output_compression', 0 );
 594                 $wgRequest->response()->header( "HTTP/1.1 304 Not Modified" );
 595                 $this->sendCacheControl();
 596                 $this->disable();
 597
 598                 // Don't output a compressed blob when using ob_gzhandler;
 599                 // it's technically against HTTP spec and seems to confuse
 600                 // Firefox when the response gets split over two packets.
 601                 wfClearOutputBuffers();
 602
 603                 return true;
 604         }
 605
 606         /**
 607          * Override the last modified timestamp
 608          *
 609          * @param $timestamp String: new timestamp, in a format readable by
 610          *        wfTimestamp()
 611          */
 612         public function setLastModified( $timestamp ) {
 613                 $this->mLastModified = wfTimestamp( TS_RFC2822, $timestamp );
 614         }
 615
 616         /**
 617          * Set the robot policy for the page: <http://www.robotstxt.org/meta.html>
 618          *
 619          * @param $policy String: the literal string to output as the contents of
 620          *   the meta tag.  Will be parsed according to the spec and output in
 621          *   standardized form.
 622          * @return null
 623          */
 624         public function setRobotPolicy( $policy ) {
 625                 $policy = Article::formatRobotPolicy( $policy );
 626
 627                 if( isset( $policy['index'] ) ) {
 628                         $this->setIndexPolicy( $policy['index'] );
 629                 }
 630                 if( isset( $policy['follow'] ) ) {
 631                         $this->setFollowPolicy( $policy['follow'] );
 632                 }
 633         }
 634
 635         /**
 636          * Set the index policy for the page, but leave the follow policy un-
 637          * touched.
 638          *
 639          * @param $policy string Either 'index' or 'noindex'.
 640          * @return null
 641          */
 642         public function setIndexPolicy( $policy ) {
 643                 $policy = trim( $policy );
 644                 if( in_array( $policy, array( 'index', 'noindex' ) ) ) {
 645                         $this->mIndexPolicy = $policy;
 646                 }
 647         }
 648
 649         /**
 650          * Set the follow policy for the page, but leave the index policy un-
 651          * touched.
 652          *
 653          * @param $policy String: either 'follow' or 'nofollow'.
 654          * @return null
 655          */
 656         public function setFollowPolicy( $policy ) {
 657                 $policy = trim( $policy );
 658                 if( in_array( $policy, array( 'follow', 'nofollow' ) ) ) {
 659                         $this->mFollowPolicy = $policy;
 660                 }
 661         }
 662
 663         /**
 664          * Set the new value of the "action text", this will be added to the
 665          * "HTML title", separated from it with " - ".
 666          *
 667          * @param $text String: new value of the "action text"
 668          */
 669         public function setPageTitleActionText( $text ) {
 670                 $this->mPageTitleActionText = $text;
 671         }
 672
 673         /**
 674          * Get the value of the "action text"
 675          *
 676          * @return String
 677          */
 678         public function getPageTitleActionText() {
 679                 if ( isset( $this->mPageTitleActionText ) ) {
 680                         return $this->mPageTitleActionText;
 681                 }
 682         }
 683
 684         /**
 685          * "HTML title" means the contents of <title>.
 686          * It is stored as plain, unescaped text and will be run through htmlspecialchars in the skin file.
 687          */
 688         public function setHTMLTitle( $name ) {
 689                 $this->mHTMLtitle = $name;
 690         }
 691
 692         /**
 693          * Return the "HTML title", i.e. the content of the <title> tag.
 694          *
 695          * @return String
 696          */
 697         public function getHTMLTitle() {
 698                 return $this->mHTMLtitle;
 699         }
 700
 701         /**
 702          * "Page title" means the contents of \<h1\>. It is stored as a valid HTML fragment.
 703          * This function allows good tags like \<sup\> in the \<h1\> tag, but not bad tags like \<script\>.
 704          * This function automatically sets \<title\> to the same content as \<h1\> but with all tags removed.
 705          * Bad tags that were escaped in \<h1\> will still be escaped in \<title\>, and good tags like \<i\> will be dropped entirely.
 706          */
 707         public function setPageTitle( $name ) {
 708                 # change "<script>foo&bar</script>" to "&lt;script&gt;foo&amp;bar&lt;/script&gt;"
 709                 # but leave "<i>foobar</i>" alone
 710                 $nameWithTags = Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags( $name ) );
 711                 $this->mPagetitle = $nameWithTags;
 712
 713                 # change "<i>foo&amp;bar</i>" to "foo&bar"
 714                 $this->setHTMLTitle( wfMsg( 'pagetitle', Sanitizer::stripAllTags( $nameWithTags ) ) );
 715         }
 716
 717         /**
 718          * Return the "page title", i.e. the content of the \<h1\> tag.
 719          *
 720          * @return String
 721          */
 722         public function getPageTitle() {
 723                 return $this->mPagetitle;
 724         }
 725
 726         /**
 727          * Set the Title object to use
 728          *
 729          * @param $t Title object
 730          */
 731         public function setTitle( $t ) {
 732                 $this->mTitle = $t;
 733         }
 734
 735         /**
 736          * Get the Title object used in this instance
 737          *
 738          * @return Title
 739          */
 740         public function getTitle() {
 741                 if ( $this->mTitle instanceof Title ) {
 742                         return $this->mTitle;
 743                 } else {
 744                         wfDebug( __METHOD__ . " called and \$mTitle is null. Return \$wgTitle for sanity\n" );
 745                         global $wgTitle;
 746                         return $wgTitle;
 747                 }
 748         }
 749
 750         /**
 751          * Replace the subtile with $str
 752          *
 753          * @param $str String: new value of the subtitle
 754          */
 755         public function setSubtitle( $str ) {
 756                 $this->mSubtitle = /*$this->parse(*/ $str /*)*/; // @bug 2514
 757         }
 758
 759         /**
 760          * Add $str to the subtitle
 761          *
 762          * @param $str String to add to the subtitle
 763          */
 764         public function appendSubtitle( $str ) {
 765                 $this->mSubtitle .= /*$this->parse(*/ $str /*)*/; // @bug 2514
 766         }
 767
 768         /**
 769          * Get the subtitle
 770          *
 771          * @return String
 772          */
 773         public function getSubtitle() {
 774                 return $this->mSubtitle;
 775         }
 776
 777         /**
 778          * Set the page as printable, i.e. it'll be displayed with with all
 779          * print styles included
 780          */
 781         public function setPrintable() {
 782                 $this->mPrintable = true;
 783         }
 784
 785         /**
 786          * Return whether the page is "printable"
 787          *
 788          * @return Boolean
 789          */
 790         public function isPrintable() {
 791                 return $this->mPrintable;
 792         }
 793
 794         /**
 795          * Disable output completely, i.e. calling output() will have no effect
 796          */
 797         public function disable() {
 798                 $this->mDoNothing = true;
 799         }
 800
 801         /**
 802          * Return whether the output will be completely disabled
 803          *
 804          * @return Boolean
 805          */
 806         public function isDisabled() {
 807                 return $this->mDoNothing;
 808         }
 809
 810         /**
 811          * Show an "add new section" link?
 812          *
 813          * @return Boolean
 814          */
 815         public function showNewSectionLink() {
 816                 return $this->mNewSectionLink;
 817         }
 818
 819         /**
 820          * Forcibly hide the new section link?
 821          *
 822          * @return Boolean
 823          */
 824         public function forceHideNewSectionLink() {
 825                 return $this->mHideNewSectionLink;
 826         }
 827
 828         /**
 829          * Add or remove feed links in the page header
 830          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
 831          * for the new version
 832          * @see addFeedLink()
 833          *
 834          * @param $show Boolean: true: add default feeds, false: remove all feeds
 835          */
 836         public function setSyndicated( $show = true ) {
 837                 if ( $show ) {
 838                         $this->setFeedAppendQuery( false );
 839                 } else {
 840                         $this->mFeedLinks = array();
 841                 }
 842         }
 843
 844         /**
 845          * Add default feeds to the page header
 846          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
 847          * for the new version
 848          * @see addFeedLink()
 849          *
 850          * @param $val String: query to append to feed links or false to output
 851          *        default links
 852          */
 853         public function setFeedAppendQuery( $val ) {
 854                 global $wgAdvertisedFeedTypes;
 855
 856                 $this->mFeedLinks = array();
 857
 858                 foreach ( $wgAdvertisedFeedTypes as $type ) {
 859                         $query = "feed=$type";
 860                         if ( is_string( $val ) ) {
 861                                 $query .= '&' . $val;
 862                         }
 863                         $this->mFeedLinks[$type] = $this->getTitle()->getLocalURL( $query );
 864                 }
 865         }
 866
 867         /**
 868          * Add a feed link to the page header
 869          *
 870          * @param $format String: feed type, should be a key of $wgFeedClasses
 871          * @param $href String: URL
 872          */
 873         public function addFeedLink( $format, $href ) {
 874                 global $wgAdvertisedFeedTypes;
 875
 876                 if ( in_array( $format, $wgAdvertisedFeedTypes ) ) {
 877                         $this->mFeedLinks[$format] = $href;
 878                 }
 879         }
 880
 881         /**
 882          * Should we output feed links for this page?
 883          * @return Boolean
 884          */
 885         public function isSyndicated() {
 886                 return count( $this->mFeedLinks ) > 0;
 887         }
 888
 889         /**
 890          * Return URLs for each supported syndication format for this page.
 891          * @return array associating format keys with URLs
 892          */
 893         public function getSyndicationLinks() {
 894                 return $this->mFeedLinks;
 895         }
 896
 897         /**
 898          * Will currently always return null
 899          *
 900          * @return null
 901          */
 902         public function getFeedAppendQuery() {
 903                 return $this->mFeedLinksAppendQuery;
 904         }
 905
 906         /**
 907          * Set whether the displayed content is related to the source of the
 908          * corresponding article on the wiki
 909          * Setting true will cause the change "article related" toggle to true
 910          *
 911          * @param $v Boolean
 912          */
 913         public function setArticleFlag( $v ) {
 914                 $this->mIsarticle = $v;
 915                 if ( $v ) {
 916                         $this->mIsArticleRelated = $v;
 917                 }
 918         }
 919
 920         /**
 921          * Return whether the content displayed page is related to the source of
 922          * the corresponding article on the wiki
 923          *
 924          * @return Boolean
 925          */
 926         public function isArticle() {
 927                 return $this->mIsarticle;
 928         }
 929
 930         /**
 931          * Set whether this page is related an article on the wiki
 932          * Setting false will cause the change of "article flag" toggle to false
 933          *
 934          * @param $v Boolean
 935          */
 936         public function setArticleRelated( $v ) {
 937                 $this->mIsArticleRelated = $v;
 938                 if ( !$v ) {
 939                         $this->mIsarticle = false;
 940                 }
 941         }
 942
 943         /**
 944          * Return whether this page is related an article on the wiki
 945          *
 946          * @return Boolean
 947          */
 948         public function isArticleRelated() {
 949                 return $this->mIsArticleRelated;
 950         }
 951
 952         /**
 953          * Add new language links
 954          *
 955          * @param $newLinkArray Associative array mapping language code to the page
 956          *                      name
 957          */
 958         public function addLanguageLinks( $newLinkArray ) {
 959                 $this->mLanguageLinks += $newLinkArray;
 960         }
 961
 962         /**
 963          * Reset the language links and add new language links
 964          *
 965          * @param $newLinkArray Associative array mapping language code to the page
 966          *                      name
 967          */
 968         public function setLanguageLinks( $newLinkArray ) {
 969                 $this->mLanguageLinks = $newLinkArray;
 970         }
 971
 972         /**
 973          * Get the list of language links
 974          *
 975          * @return Associative array mapping language code to the page name
 976          */
 977         public function getLanguageLinks() {
 978                 return $this->mLanguageLinks;
 979         }
 980
 981         /**
 982          * Add an array of categories, with names in the keys
 983          *
 984          * @param $categories Associative array mapping category name to its sort key
 985          */
 986         public function addCategoryLinks( $categories ) {
 987                 global $wgUser, $wgContLang;
 988
 989                 if ( !is_array( $categories ) || count( $categories ) == 0 ) {
 990                         return;
 991                 }
 992
 993                 # Add the links to a LinkBatch
 994                 $arr = array( NS_CATEGORY => $categories );
 995                 $lb = new LinkBatch;
 996                 $lb->setArray( $arr );
 997
 998                 # Fetch existence plus the hiddencat property
 999                 $dbr = wfGetDB( DB_SLAVE );
1000                 $pageTable = $dbr->tableName( 'page' );
1001                 $where = $lb->constructSet( 'page', $dbr );
1002                 $propsTable = $dbr->tableName( 'page_props' );
1003                 $sql = "SELECT page_id, page_namespace, page_title, page_len, page_is_redirect, page_latest, pp_value
1004                         FROM $pageTable LEFT JOIN $propsTable ON pp_propname='hiddencat' AND pp_page=page_id WHERE $where";
1005                 $res = $dbr->query( $sql, __METHOD__ );
1006
1007                 # Add the results to the link cache
1008                 $lb->addResultToCache( LinkCache::singleton(), $res );
1009
1010                 # Set all the values to 'normal'. This can be done with array_fill_keys in PHP 5.2.0+
1011                 $categories = array_combine(
1012                         array_keys( $categories ),
1013                         array_fill( 0, count( $categories ), 'normal' )
1014                 );
1015
1016                 # Mark hidden categories
1017                 foreach ( $res as $row ) {
1018                         if ( isset( $row->pp_value ) ) {
1019                                 $categories[$row->page_title] = 'hidden';
1020                         }
1021                 }
1022
1023                 # Add the remaining categories to the skin
1024                 if ( wfRunHooks( 'OutputPageMakeCategoryLinks', array( &$this, $categories, &$this->mCategoryLinks ) ) ) {
1025                         $sk = $wgUser->getSkin();
1026                         foreach ( $categories as $category => $type ) {
1027                                 $origcategory = $category;
1028                                 $title = Title::makeTitleSafe( NS_CATEGORY, $category );
1029                                 $wgContLang->findVariantLink( $category, $title, true );
1030                                 if ( $category != $origcategory ) {
1031                                         if ( array_key_exists( $category, $categories ) ) {
1032                                                 continue;
1033                                         }
1034                                 }
1035                                 $text = $wgContLang->convertHtml( $title->getText() );
1036                                 $this->mCategories[] = $title->getText();
1037                                 $this->mCategoryLinks[$type][] = $sk->link( $title, $text );
1038                         }
1039                 }
1040         }
1041
1042         /**
1043          * Reset the category links (but not the category list) and add $categories
1044          *
1045          * @param $categories Associative array mapping category name to its sort key
1046          */
1047         public function setCategoryLinks( $categories ) {
1048                 $this->mCategoryLinks = array();
1049                 $this->addCategoryLinks( $categories );
1050         }
1051
1052         /**
1053          * Get the list of category links, in a 2-D array with the following format:
1054          * $arr[$type][] = $link, where $type is either "normal" or "hidden" (for
1055          * hidden categories) and $link a HTML fragment with a link to the category
1056          * page
1057          *
1058          * @return Array
1059          */
1060         public function getCategoryLinks() {
1061                 return $this->mCategoryLinks;
1062         }
1063
1064         /**
1065          * Get the list of category names this page belongs to
1066          *
1067          * @return Array of strings
1068          */
1069         public function getCategories() {
1070                 return $this->mCategories;
1071         }
1072
1073         /**
1074          * Suppress the quickbar from the output, only for skin supporting
1075          * the quickbar
1076          */
1077         public function suppressQuickbar() {
1078                 $this->mSuppressQuickbar = true;
1079         }
1080
1081         /**
1082          * Return whether the quickbar should be suppressed from the output
1083          *
1084          * @return Boolean
1085          */
1086         public function isQuickbarSuppressed() {
1087                 return $this->mSuppressQuickbar;
1088         }
1089
1090         /**
1091          * Remove user JavaScript from scripts to load
1092          */
1093         public function disallowUserJs() {
1094                 $this->mAllowUserJs = false;
1095         }
1096
1097         /**
1098          * Return whether user JavaScript is allowed for this page
1099          *
1100          * @return Boolean
1101          */
1102         public function isUserJsAllowed() {
1103                 return $this->mAllowUserJs;
1104         }
1105
1106         /**
1107          * Prepend $text to the body HTML
1108          *
1109          * @param $text String: HTML
1110          */
1111         public function prependHTML( $text ) {
1112                 $this->mBodytext = $text . $this->mBodytext;
1113         }
1114
1115         /**
1116          * Append $text to the body HTML
1117          *
1118          * @param $text String: HTML
1119          */
1120         public function addHTML( $text ) {
1121                 $this->mBodytext .= $text;
1122         }
1123
1124         /**
1125          * Clear the body HTML
1126          */
1127         public function clearHTML() {
1128                 $this->mBodytext = '';
1129         }
1130
1131         /**
1132          * Get the body HTML
1133          *
1134          * @return String: HTML
1135          */
1136         public function getHTML() {
1137                 return $this->mBodytext;
1138         }
1139
1140         /**
1141          * Add $text to the debug output
1142          *
1143          * @param $text String: debug text
1144          */
1145         public function debug( $text ) {
1146                 $this->mDebugtext .= $text;
1147         }
1148
1149         /**
1150          * Get/set the ParserOptions object to use for wikitext parsing
1151          *
1152          * @param $options either the ParserOption to use or null to only get the
1153          *                 current ParserOption object
1154          * @return current ParserOption object
1155          */
1156         public function parserOptions( $options = null ) {
1157                 if ( !$this->mParserOptions ) {
1158                         $this->mParserOptions = new ParserOptions;
1159                 }
1160                 return wfSetVar( $this->mParserOptions, $options );
1161         }
1162
1163         /**
1164          * Set the revision ID which will be seen by the wiki text parser
1165          * for things such as embedded {{REVISIONID}} variable use.
1166          *
1167          * @param $revid Mixed: an positive integer, or null
1168          * @return Mixed: previous value
1169          */
1170         public function setRevisionId( $revid ) {
1171                 $val = is_null( $revid ) ? null : intval( $revid );
1172                 return wfSetVar( $this->mRevisionId, $val );
1173         }
1174
1175         /**
1176          * Get the current revision ID
1177          *
1178          * @return Integer
1179          */
1180         public function getRevisionId() {
1181                 return $this->mRevisionId;
1182         }
1183
1184         /**
1185          * Convert wikitext to HTML and add it to the buffer
1186          * Default assumes that the current page title will be used.
1187          *
1188          * @param $text String
1189          * @param $linestart Boolean: is this the start of a line?
1190          */
1191         public function addWikiText( $text, $linestart = true ) {
1192                 $title = $this->getTitle(); // Work arround E_STRICT
1193                 $this->addWikiTextTitle( $text, $title, $linestart );
1194         }
1195
1196         /**
1197          * Add wikitext with a custom Title object
1198          *
1199          * @param $text String: wikitext
1200          * @param $title Title object
1201          * @param $linestart Boolean: is this the start of a line?
1202          */
1203         public function addWikiTextWithTitle( $text, &$title, $linestart = true ) {
1204                 $this->addWikiTextTitle( $text, $title, $linestart );
1205         }
1206
1207         /**
1208          * Add wikitext with a custom Title object and
1209          *
1210          * @param $text String: wikitext
1211          * @param $title Title object
1212          * @param $linestart Boolean: is this the start of a line?
1213          */
1214         function addWikiTextTitleTidy( $text, &$title, $linestart = true ) {
1215                 $this->addWikiTextTitle( $text, $title, $linestart, true );
1216         }
1217
1218         /**
1219          * Add wikitext with tidy enabled
1220          *
1221          * @param $text String: wikitext
1222          * @param $linestart Boolean: is this the start of a line?
1223          */
1224         public function addWikiTextTidy( $text, $linestart = true ) {
1225                 $title = $this->getTitle();
1226                 $this->addWikiTextTitleTidy( $text, $title, $linestart );
1227         }
1228
1229         /**
1230          * Add wikitext with a custom Title object
1231          *
1232          * @param $text String: wikitext
1233          * @param $title Title object
1234          * @param $linestart Boolean: is this the start of a line?
1235          * @param $tidy Boolean: whether to use tidy
1236          */
1237         public function addWikiTextTitle( $text, &$title, $linestart, $tidy = false ) {
1238                 global $wgParser;
1239
1240                 wfProfileIn( __METHOD__ );
1241
1242                 wfIncrStats( 'pcache_not_possible' );
1243
1244                 $popts = $this->parserOptions();
1245                 $oldTidy = $popts->setTidy( $tidy );
1246
1247                 $parserOutput = $wgParser->parse(
1248                         $text, $title, $popts,
1249                         $linestart, true, $this->mRevisionId
1250                 );
1251
1252                 $popts->setTidy( $oldTidy );
1253
1254                 $this->addParserOutput( $parserOutput );
1255
1256                 wfProfileOut( __METHOD__ );
1257         }
1258
1259         /**
1260          * Add a ParserOutput object, but without Html
1261          *
1262          * @param $parserOutput ParserOutput object
1263          */
1264         public function addParserOutputNoText( &$parserOutput ) {
1265                 $this->mLanguageLinks += $parserOutput->getLanguageLinks();
1266                 $this->addCategoryLinks( $parserOutput->getCategories() );
1267                 $this->mNewSectionLink = $parserOutput->getNewSection();
1268                 $this->mHideNewSectionLink = $parserOutput->getHideNewSection();
1269
1270                 $this->mParseWarnings = $parserOutput->getWarnings();
1271                 if ( !$parserOutput->isCacheable() ) {
1272                         $this->enableClientCache( false );
1273                 }
1274                 $this->mNoGallery = $parserOutput->getNoGallery();
1275                 $this->mHeadItems = array_merge( $this->mHeadItems, $parserOutput->getHeadItems() );
1276                 $this->addModules( $parserOutput->getModules() );
1277                 // Versioning...
1278                 foreach ( (array)$parserOutput->mTemplateIds as $ns => $dbks ) {
1279                         if ( isset( $this->mTemplateIds[$ns] ) ) {
1280                                 $this->mTemplateIds[$ns] = $dbks + $this->mTemplateIds[$ns];
1281                         } else {
1282                                 $this->mTemplateIds[$ns] = $dbks;
1283                         }
1284                 }
1285
1286                 // Hooks registered in the object
1287                 global $wgParserOutputHooks;
1288                 foreach ( $parserOutput->getOutputHooks() as $hookInfo ) {
1289                         list( $hookName, $data ) = $hookInfo;
1290                         if ( isset( $wgParserOutputHooks[$hookName] ) ) {
1291                                 call_user_func( $wgParserOutputHooks[$hookName], $this, $parserOutput, $data );
1292                         }
1293                 }
1294
1295                 wfRunHooks( 'OutputPageParserOutput', array( &$this, $parserOutput ) );
1296         }
1297
1298         /**
1299          * Add a ParserOutput object
1300          *
1301          * @param $parserOutput ParserOutput
1302          */
1303         function addParserOutput( &$parserOutput ) {
1304                 $this->addParserOutputNoText( $parserOutput );
1305                 $text = $parserOutput->getText();
1306                 wfRunHooks( 'OutputPageBeforeHTML', array( &$this, &$text ) );
1307                 $this->addHTML( $text );
1308         }
1309
1310
1311         /**
1312          * Add the output of a QuickTemplate to the output buffer
1313          *
1314          * @param $template QuickTemplate
1315          */
1316         public function addTemplate( &$template ) {
1317                 ob_start();
1318                 $template->execute();
1319                 $this->addHTML( ob_get_contents() );
1320                 ob_end_clean();
1321         }
1322
1323         /**
1324          * Parse wikitext and return the HTML.
1325          *
1326          * @param $text String
1327          * @param $linestart Boolean: is this the start of a line?
1328          * @param $interface Boolean: use interface language ($wgLang instead of
1329          *                   $wgContLang) while parsing language sensitive magic
1330          *                   words like GRAMMAR and PLURAL
1331          * @param $language  Language object: target language object, will override
1332          *                   $interface
1333          * @return String: HTML
1334          */
1335         public function parse( $text, $linestart = true, $interface = false, $language = null ) {
1336                 // Check one for one common cause for parser state resetting
1337                 $callers = wfGetAllCallers( 10 );
1338                 if ( strpos( $callers, 'Parser::extensionSubstitution' ) !== false ) {
1339                         throw new MWException( "wfMsg* function with parsing cannot be used " .
1340                                 "inside a tag hook. Should use parser->recursiveTagParse() instead" );
1341                 }
1342
1343                 global $wgParser;
1344
1345                 if( is_null( $this->getTitle() ) ) {
1346                         throw new MWException( 'Empty $mTitle in ' . __METHOD__ );
1347                 }
1348
1349                 $popts = $this->parserOptions();
1350                 if ( $interface ) {
1351                         $popts->setInterfaceMessage( true );
1352                 }
1353                 if ( $language !== null ) {
1354                         $oldLang = $popts->setTargetLanguage( $language );
1355                 }
1356
1357                 $parserOutput = $wgParser->parse(
1358                         $text, $this->getTitle(), $popts,
1359                         $linestart, true, $this->mRevisionId
1360                 );
1361
1362                 if ( $interface ) {
1363                         $popts->setInterfaceMessage( false );
1364                 }
1365                 if ( $language !== null ) {
1366                         $popts->setTargetLanguage( $oldLang );
1367                 }
1368
1369                 return $parserOutput->getText();
1370         }
1371
1372         /**
1373          * Parse wikitext, strip paragraphs, and return the HTML.
1374          *
1375          * @param $text String
1376          * @param $linestart Boolean: is this the start of a line?
1377          * @param $interface Boolean: use interface language ($wgLang instead of
1378          *                   $wgContLang) while parsing language sensitive magic
1379          *                   words like GRAMMAR and PLURAL
1380          * @return String: HTML
1381          */
1382         public function parseInline( $text, $linestart = true, $interface = false ) {
1383                 $parsed = $this->parse( $text, $linestart, $interface );
1384
1385                 $m = array();
1386                 if ( preg_match( '/^<p>(.*)\n?<\/p>\n?/sU', $parsed, $m ) ) {
1387                         $parsed = $m[1];
1388                 }
1389
1390                 return $parsed;
1391         }
1392
1393         /**
1394          * Set the value of the "s-maxage" part of the "Cache-control" HTTP header
1395          *
1396          * @param $maxage Integer: maximum cache time on the Squid, in seconds.
1397          */
1398         public function setSquidMaxage( $maxage ) {
1399                 $this->mSquidMaxage = $maxage;
1400         }
1401
1402         /**
1403          * Use enableClientCache(false) to force it to send nocache headers
1404          *
1405          * @param $state ??
1406          */
1407         public function enableClientCache( $state ) {
1408                 return wfSetVar( $this->mEnableClientCache, $state );
1409         }
1410
1411         /**
1412          * Get the list of cookies that will influence on the cache
1413          *
1414          * @return Array
1415          */
1416         function getCacheVaryCookies() {
1417                 global $wgCookiePrefix, $wgCacheVaryCookies;
1418                 static $cookies;
1419                 if ( $cookies === null ) {
1420                         $cookies = array_merge(
1421                                 array(
1422                                         "{$wgCookiePrefix}Token",
1423                                         "{$wgCookiePrefix}LoggedOut",
1424                                         session_name()
1425                                 ),
1426                                 $wgCacheVaryCookies
1427                         );
1428                         wfRunHooks( 'GetCacheVaryCookies', array( $this, &$cookies ) );
1429                 }
1430                 return $cookies;
1431         }
1432
1433         /**
1434          * Return whether this page is not cacheable because "useskin" or "uselang"
1435          * URL parameters were passed.
1436          *
1437          * @return Boolean
1438          */
1439         function uncacheableBecauseRequestVars() {
1440                 global $wgRequest;
1441                 return $wgRequest->getText( 'useskin', false ) === false
1442                         && $wgRequest->getText( 'uselang', false ) === false;
1443         }
1444
1445         /**
1446          * Check if the request has a cache-varying cookie header
1447          * If it does, it's very important that we don't allow public caching
1448          *
1449          * @return Boolean
1450          */
1451         function haveCacheVaryCookies() {
1452                 global $wgRequest;
1453                 $cookieHeader = $wgRequest->getHeader( 'cookie' );
1454                 if ( $cookieHeader === false ) {
1455                         return false;
1456                 }
1457                 $cvCookies = $this->getCacheVaryCookies();
1458                 foreach ( $cvCookies as $cookieName ) {
1459                         # Check for a simple string match, like the way squid does it
1460                         if ( strpos( $cookieHeader, $cookieName ) !== false ) {
1461                                 wfDebug( __METHOD__ . ": found $cookieName\n" );
1462                                 return true;
1463                         }
1464                 }
1465                 wfDebug( __METHOD__ . ": no cache-varying cookies found\n" );
1466                 return false;
1467         }
1468
1469         /**
1470          * Add an HTTP header that will influence on the cache
1471          *
1472          * @param $header String: header name
1473          * @param $option either an Array or null
1474          */
1475         public function addVaryHeader( $header, $option = null ) {
1476                 if ( !array_key_exists( $header, $this->mVaryHeader ) ) {
1477                         $this->mVaryHeader[$header] = $option;
1478                 } elseif( is_array( $option ) ) {
1479                         if( is_array( $this->mVaryHeader[$header] ) ) {
1480                                 $this->mVaryHeader[$header] = array_merge( $this->mVaryHeader[$header], $option );
1481                         } else {
1482                                 $this->mVaryHeader[$header] = $option;
1483                         }
1484                 }
1485                 $this->mVaryHeader[$header] = array_unique( $this->mVaryHeader[$header] );
1486         }
1487
1488         /**
1489          * Get a complete X-Vary-Options header
1490          *
1491          * @return String
1492          */
1493         public function getXVO() {
1494                 $cvCookies = $this->getCacheVaryCookies();
1495
1496                 $cookiesOption = array();
1497                 foreach ( $cvCookies as $cookieName ) {
1498                         $cookiesOption[] = 'string-contains=' . $cookieName;
1499                 }
1500                 $this->addVaryHeader( 'Cookie', $cookiesOption );
1501
1502                 $headers = array();
1503                 foreach( $this->mVaryHeader as $header => $option ) {
1504                         $newheader = $header;
1505                         if( is_array( $option ) ) {
1506                                 $newheader .= ';' . implode( ';', $option );
1507                         }
1508                         $headers[] = $newheader;
1509                 }
1510                 $xvo = 'X-Vary-Options: ' . implode( ',', $headers );
1511
1512                 return $xvo;
1513         }
1514
1515         /**
1516          * bug 21672: Add Accept-Language to Vary and XVO headers
1517          * if there's no 'variant' parameter existed in GET.
1518          *
1519          * For example:
1520          *   /w/index.php?title=Main_page should always be served; but
1521          *   /w/index.php?title=Main_page&variant=zh-cn should never be served.
1522          */
1523         function addAcceptLanguage() {
1524                 global $wgRequest, $wgContLang;
1525                 if( !$wgRequest->getCheck( 'variant' ) && $wgContLang->hasVariants() ) {
1526                         $variants = $wgContLang->getVariants();
1527                         $aloption = array();
1528                         foreach ( $variants as $variant ) {
1529                                 if( $variant === $wgContLang->getCode() ) {
1530                                         continue;
1531                                 } else {
1532                                         $aloption[] = 'string-contains=' . $variant;
1533
1534                                         // IE and some other browsers use another form of language code
1535                                         // in their Accept-Language header, like "zh-CN" or "zh-TW".
1536                                         // We should handle these too.
1537                                         $ievariant = explode( '-', $variant );
1538                                         if ( count( $ievariant ) == 2 ) {
1539                                                 $ievariant[1] = strtoupper( $ievariant[1] );
1540                                                 $ievariant = implode( '-', $ievariant );
1541                                                 $aloption[] = 'string-contains=' . $ievariant;
1542                                         }
1543                                 }
1544                         }
1545                         $this->addVaryHeader( 'Accept-Language', $aloption );
1546                 }
1547         }
1548
1549         /**
1550          * Set a flag which will cause an X-Frame-Options header appropriate for
1551          * edit pages to be sent. The header value is controlled by
1552          * $wgEditPageFrameOptions.
1553          *
1554          * This is the default for special pages. If you display a CSRF-protected
1555          * form on an ordinary view page, then you need to call this function.
1556          */
1557         public function preventClickjacking( $enable = true ) {
1558                 $this->mPreventClickjacking = $enable;
1559         }
1560
1561         /**
1562          * Turn off frame-breaking. Alias for $this->preventClickjacking(false).
1563          * This can be called from pages which do not contain any CSRF-protected
1564          * HTML form.
1565          */
1566         public function allowClickjacking() {
1567                 $this->mPreventClickjacking = false;
1568         }
1569
1570         /**
1571          * Get the X-Frame-Options header value (without the name part), or false
1572          * if there isn't one. This is used by Skin to determine whether to enable
1573          * JavaScript frame-breaking, for clients that don't support X-Frame-Options.
1574          */
1575         public function getFrameOptions() {
1576                 global $wgBreakFrames, $wgEditPageFrameOptions;
1577                 if ( $wgBreakFrames ) {
1578                         return 'DENY';
1579                 } elseif ( $this->mPreventClickjacking && $wgEditPageFrameOptions ) {
1580                         return $wgEditPageFrameOptions;
1581                 }
1582         }
1583
1584         /**
1585          * Send cache control HTTP headers
1586          */
1587         public function sendCacheControl() {
1588                 global $wgUseSquid, $wgUseESI, $wgUseETag, $wgSquidMaxage, $wgRequest, $wgUseXVO;
1589
1590                 $response = $wgRequest->response();
1591                 if ( $wgUseETag && $this->mETag ) {
1592                         $response->header( "ETag: $this->mETag" );
1593                 }
1594
1595                 $this->addAcceptLanguage();
1596
1597                 # don't serve compressed data to clients who can't handle it
1598                 # maintain different caches for logged-in users and non-logged in ones
1599                 $response->header( 'Vary: ' . join( ', ', array_keys( $this->mVaryHeader ) ) );
1600
1601                 if ( $wgUseXVO ) {
1602                         # Add an X-Vary-Options header for Squid with Wikimedia patches
1603                         $response->header( $this->getXVO() );
1604                 }
1605
1606                 if( !$this->uncacheableBecauseRequestVars() && $this->mEnableClientCache ) {
1607                         if(
1608                                 $wgUseSquid && session_id() == '' && !$this->isPrintable() &&
1609                                 $this->mSquidMaxage != 0 && !$this->haveCacheVaryCookies()
1610                         )
1611                         {
1612                                 if ( $wgUseESI ) {
1613                                         # We'll purge the proxy cache explicitly, but require end user agents
1614                                         # to revalidate against the proxy on each visit.
1615                                         # Surrogate-Control controls our Squid, Cache-Control downstream caches
1616                                         wfDebug( __METHOD__ . ": proxy caching with ESI; {$this->mLastModified} **\n", false );
1617                                         # start with a shorter timeout for initial testing
1618                                         # header( 'Surrogate-Control: max-age=2678400+2678400, content="ESI/1.0"');
1619                                         $response->header( 'Surrogate-Control: max-age='.$wgSquidMaxage.'+'.$this->mSquidMaxage.', content="ESI/1.0"');
1620                                         $response->header( 'Cache-Control: s-maxage=0, must-revalidate, max-age=0' );
1621                                 } else {
1622                                         # We'll purge the proxy cache for anons explicitly, but require end user agents
1623                                         # to revalidate against the proxy on each visit.
1624                                         # IMPORTANT! The Squid needs to replace the Cache-Control header with
1625                                         # Cache-Control: s-maxage=0, must-revalidate, max-age=0
1626                                         wfDebug( __METHOD__ . ": local proxy caching; {$this->mLastModified} **\n", false );
1627                                         # start with a shorter timeout for initial testing
1628                                         # header( "Cache-Control: s-maxage=2678400, must-revalidate, max-age=0" );
1629                                         $response->header( 'Cache-Control: s-maxage='.$this->mSquidMaxage.', must-revalidate, max-age=0' );
1630                                 }
1631                         } else {
1632                                 # We do want clients to cache if they can, but they *must* check for updates
1633                                 # on revisiting the page.
1634                                 wfDebug( __METHOD__ . ": private caching; {$this->mLastModified} **\n", false );
1635                                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1636                                 $response->header( "Cache-Control: private, must-revalidate, max-age=0" );
1637                         }
1638                         if($this->mLastModified) {
1639                                 $response->header( "Last-Modified: {$this->mLastModified}" );
1640                         }
1641                 } else {
1642                         wfDebug( __METHOD__ . ": no caching **\n", false );
1643
1644                         # In general, the absence of a last modified header should be enough to prevent
1645                         # the client from using its cache. We send a few other things just to make sure.
1646                         $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1647                         $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
1648                         $response->header( 'Pragma: no-cache' );
1649                 }
1650         }
1651
1652         /**
1653          * Get the message associed with the HTTP response code $code
1654          *
1655          * @param $code Integer: status code
1656          * @return String or null: message or null if $code is not in the list of
1657          *         messages
1658          */
1659         public static function getStatusMessage( $code ) {
1660                 static $statusMessage = array(
1661                         100 => 'Continue',
1662                         101 => 'Switching Protocols',
1663                         102 => 'Processing',
1664                         200 => 'OK',
1665                         201 => 'Created',
1666                         202 => 'Accepted',
1667                         203 => 'Non-Authoritative Information',
1668                         204 => 'No Content',
1669                         205 => 'Reset Content',
1670                         206 => 'Partial Content',
1671                         207 => 'Multi-Status',
1672                         300 => 'Multiple Choices',
1673                         301 => 'Moved Permanently',
1674                         302 => 'Found',
1675                         303 => 'See Other',
1676                         304 => 'Not Modified',
1677                         305 => 'Use Proxy',
1678                         307 => 'Temporary Redirect',
1679                         400 => 'Bad Request',
1680                         401 => 'Unauthorized',
1681                         402 => 'Payment Required',
1682                         403 => 'Forbidden',
1683                         404 => 'Not Found',
1684                         405 => 'Method Not Allowed',
1685                         406 => 'Not Acceptable',
1686                         407 => 'Proxy Authentication Required',
1687                         408 => 'Request Timeout',
1688                         409 => 'Conflict',
1689                         410 => 'Gone',
1690                         411 => 'Length Required',
1691                         412 => 'Precondition Failed',
1692                         413 => 'Request Entity Too Large',
1693                         414 => 'Request-URI Too Large',
1694                         415 => 'Unsupported Media Type',
1695                         416 => 'Request Range Not Satisfiable',
1696                         417 => 'Expectation Failed',
1697                         422 => 'Unprocessable Entity',
1698                         423 => 'Locked',
1699                         424 => 'Failed Dependency',
1700                         500 => 'Internal Server Error',
1701                         501 => 'Not Implemented',
1702                         502 => 'Bad Gateway',
1703                         503 => 'Service Unavailable',
1704                         504 => 'Gateway Timeout',
1705                         505 => 'HTTP Version Not Supported',
1706                         507 => 'Insufficient Storage'
1707                 );
1708                 return isset( $statusMessage[$code] ) ? $statusMessage[$code] : null;
1709         }
1710
1711         /**
1712          * Finally, all the text has been munged and accumulated into
1713          * the object, let's actually output it:
1714          */
1715         public function output() {
1716                 global $wgUser, $wgOutputEncoding, $wgRequest;
1717                 global $wgLanguageCode, $wgDebugRedirects, $wgMimeType;
1718                 global $wgUseAjax, $wgAjaxWatch;
1719                 global $wgEnableMWSuggest, $wgUniversalEditButton;
1720
1721                 if( $this->mDoNothing ) {
1722                         return;
1723                 }
1724                 wfProfileIn( __METHOD__ );
1725                 if ( $this->mRedirect != '' ) {
1726                         # Standards require redirect URLs to be absolute
1727                         $this->mRedirect = wfExpandUrl( $this->mRedirect );
1728                         if( $this->mRedirectCode == '301' || $this->mRedirectCode == '303' ) {
1729                                 if( !$wgDebugRedirects ) {
1730                                         $message = self::getStatusMessage( $this->mRedirectCode );
1731                                         $wgRequest->response()->header( "HTTP/1.1 {$this->mRedirectCode} $message" );
1732                                 }
1733                                 $this->mLastModified = wfTimestamp( TS_RFC2822 );
1734                         }
1735                         $this->sendCacheControl();
1736
1737                         $wgRequest->response()->header( "Content-Type: text/html; charset=utf-8" );
1738                         if( $wgDebugRedirects ) {
1739                                 $url = htmlspecialchars( $this->mRedirect );
1740                                 print "<html>\n<head>\n<title>Redirect</title>\n</head>\n<body>\n";
1741                                 print "<p>Location: <a href=\"$url\">$url</a></p>\n";
1742                                 print "</body>\n</html>\n";
1743                         } else {
1744                                 $wgRequest->response()->header( 'Location: ' . $this->mRedirect );
1745                         }
1746                         wfProfileOut( __METHOD__ );
1747                         return;
1748                 } elseif ( $this->mStatusCode ) {
1749                         $message = self::getStatusMessage( $this->mStatusCode );
1750                         if ( $message ) {
1751                                 $wgRequest->response()->header( 'HTTP/1.1 ' . $this->mStatusCode . ' ' . $message );
1752                         }
1753                 }
1754
1755                 $sk = $wgUser->getSkin();
1756
1757                 // Add base resources
1758                 $this->addModules( array( 'mediawiki.legacy.wikibits', 'mediawiki.util' ) );
1759
1760                 // Add various resources if required
1761                 if ( $wgUseAjax ) {
1762                         $this->addModules( 'mediawiki.legacy.ajax' );
1763
1764                         wfRunHooks( 'AjaxAddScript', array( &$this ) );
1765
1766                         if( $wgAjaxWatch && $wgUser->isLoggedIn() ) {
1767                                 $this->addModules( 'mediawiki.action.watch.ajax' );
1768                         }
1769
1770                         if ( $wgEnableMWSuggest && !$wgUser->getOption( 'disablesuggest', false ) ) {
1771                                 $this->addModules( 'mediawiki.legacy.mwsuggest' );
1772                         }
1773                 }
1774
1775                 if( $wgUser->getBoolOption( 'editsectiononrightclick' ) ) {
1776                         $this->addModules( 'mediawiki.action.view.rightClickEdit' );
1777                 }
1778
1779                 if( $wgUniversalEditButton ) {
1780                         if( $this->isArticleRelated() && $this->getTitle() && $this->getTitle()->quickUserCan( 'edit' )
1781                                 && ( $this->getTitle()->exists() || $this->getTitle()->quickUserCan( 'create' ) ) ) {
1782                                 // Original UniversalEditButton
1783                                 $msg = wfMsg( 'edit' );
1784                                 $this->addLink( array(
1785                                         'rel' => 'alternate',
1786                                         'type' => 'application/x-wiki',
1787                                         'title' => $msg,
1788                                         'href' => $this->getTitle()->getLocalURL( 'action=edit' )
1789                                 ) );
1790                                 // Alternate edit link
1791                                 $this->addLink( array(
1792                                         'rel' => 'edit',
1793                                         'title' => $msg,
1794                                         'href' => $this->getTitle()->getLocalURL( 'action=edit' )
1795                                 ) );
1796                         }
1797                 }
1798
1799
1800                 # Buffer output; final headers may depend on later processing
1801                 ob_start();
1802
1803                 $wgRequest->response()->header( "Content-type: $wgMimeType; charset={$wgOutputEncoding}" );
1804                 $wgRequest->response()->header( 'Content-language: ' . $wgLanguageCode );
1805
1806                 // Prevent framing, if requested
1807                 $frameOptions = $this->getFrameOptions();
1808                 if ( $frameOptions ) {
1809                         $wgRequest->response()->header( "X-Frame-Options: $frameOptions" );
1810                 }
1811
1812                 if ( $this->mArticleBodyOnly ) {
1813                         $this->out( $this->mBodytext );
1814                 } else {
1815                         // Hook that allows last minute changes to the output page, e.g.
1816                         // adding of CSS or Javascript by extensions.
1817                         wfRunHooks( 'BeforePageDisplay', array( &$this, &$sk ) );
1818
1819                         wfProfileIn( 'Output-skin' );
1820                         $sk->outputPage( $this );
1821                         wfProfileOut( 'Output-skin' );
1822                 }
1823
1824                 $this->sendCacheControl();
1825                 ob_end_flush();
1826                 wfProfileOut( __METHOD__ );
1827         }
1828
1829         /**
1830          * Actually output something with print(). Performs an iconv to the
1831          * output encoding, if needed.
1832          *
1833          * @param $ins String: the string to output
1834          */
1835         public function out( $ins ) {
1836                 global $wgInputEncoding, $wgOutputEncoding, $wgContLang;
1837                 if ( 0 == strcmp( $wgInputEncoding, $wgOutputEncoding ) ) {
1838                         $outs = $ins;
1839                 } else {
1840                         $outs = $wgContLang->iconv( $wgInputEncoding, $wgOutputEncoding, $ins );
1841                         if ( false === $outs ) {
1842                                 $outs = $ins;
1843                         }
1844                 }
1845                 print $outs;
1846         }
1847
1848         /**
1849          * Produce a "user is blocked" page.
1850          *
1851          * @param $return Boolean: whether to have a "return to $wgTitle" message or not.
1852          * @return nothing
1853          */
1854         function blockedPage( $return = true ) {
1855                 global $wgUser, $wgContLang, $wgLang;
1856
1857                 $this->setPageTitle( wfMsg( 'blockedtitle' ) );
1858                 $this->setRobotPolicy( 'noindex,nofollow' );
1859                 $this->setArticleRelated( false );
1860
1861                 $name = User::whoIs( $wgUser->blockedBy() );
1862                 $reason = $wgUser->blockedFor();
1863                 if( $reason == '' ) {
1864                         $reason = wfMsg( 'blockednoreason' );
1865                 }
1866                 $blockTimestamp = $wgLang->timeanddate(
1867                         wfTimestamp( TS_MW, $wgUser->mBlock->mTimestamp ), true
1868                 );
1869                 $ip = wfGetIP();
1870
1871                 $link = '[[' . $wgContLang->getNsText( NS_USER ) . ":{$name}|{$name}]]";
1872
1873                 $blockid = $wgUser->mBlock->mId;
1874
1875                 $blockExpiry = $wgUser->mBlock->mExpiry;
1876                 if ( $blockExpiry == 'infinity' ) {
1877                         // Entry in database (table ipblocks) is 'infinity' but 'ipboptions' uses 'infinite' or 'indefinite'
1878                         // Search for localization in 'ipboptions'
1879                         $scBlockExpiryOptions = wfMsg( 'ipboptions' );
1880                         foreach ( explode( ',', $scBlockExpiryOptions ) as $option ) {
1881                                 if ( strpos( $option, ':' ) === false ) {
1882                                         continue;
1883                                 }
1884                                 list( $show, $value ) = explode( ':', $option );
1885                                 if ( $value == 'infinite' || $value == 'indefinite' ) {
1886                                         $blockExpiry = $show;
1887                                         break;
1888                                 }
1889                         }
1890                 } else {
1891                         $blockExpiry = $wgLang->timeanddate(
1892                                 wfTimestamp( TS_MW, $blockExpiry ),
1893                                 true
1894                         );
1895                 }
1896
1897                 if ( $wgUser->mBlock->mAuto ) {
1898                         $msg = 'autoblockedtext';
1899                 } else {
1900                         $msg = 'blockedtext';
1901                 }
1902
1903                 /* $ip returns who *is* being blocked, $intended contains who was meant to be blocked.
1904                  * This could be a username, an IP range, or a single IP. */
1905                 $intended = $wgUser->mBlock->mAddress;
1906
1907                 $this->addWikiMsg(
1908                         $msg, $link, $reason, $ip, $name, $blockid, $blockExpiry,
1909                         $intended, $blockTimestamp
1910                 );
1911
1912                 # Don't auto-return to special pages
1913                 if( $return ) {
1914                         $return = $this->getTitle()->getNamespace() > -1 ? $this->getTitle() : null;
1915                         $this->returnToMain( null, $return );
1916                 }
1917         }
1918
1919         /**
1920          * Output a standard error page
1921          *
1922          * @param $title String: message key for page title
1923          * @param $msg String: message key for page text
1924          * @param $params Array: message parameters
1925          */
1926         public function showErrorPage( $title, $msg, $params = array() ) {
1927                 if ( $this->getTitle() ) {
1928                         $this->mDebugtext .= 'Original title: ' . $this->getTitle()->getPrefixedText() . "\n";
1929                 }
1930                 $this->setPageTitle( wfMsg( $title ) );
1931                 $this->setHTMLTitle( wfMsg( 'errorpagetitle' ) );
1932                 $this->setRobotPolicy( 'noindex,nofollow' );
1933                 $this->setArticleRelated( false );
1934                 $this->enableClientCache( false );
1935                 $this->mRedirect = '';
1936                 $this->mBodytext = '';
1937
1938                 $this->addWikiMsgArray( $msg, $params );
1939
1940                 $this->returnToMain();
1941         }
1942
1943         /**
1944          * Output a standard permission error page
1945          *
1946          * @param $errors Array: error message keys
1947          * @param $action String: action that was denied or null if unknown
1948          */
1949         public function showPermissionsErrorPage( $errors, $action = null ) {
1950                 $this->mDebugtext .= 'Original title: ' .
1951                 $this->getTitle()->getPrefixedText() . "\n";
1952                 $this->setPageTitle( wfMsg( 'permissionserrors' ) );
1953                 $this->setHTMLTitle( wfMsg( 'permissionserrors' ) );
1954                 $this->setRobotPolicy( 'noindex,nofollow' );
1955                 $this->setArticleRelated( false );
1956                 $this->enableClientCache( false );
1957                 $this->mRedirect = '';
1958                 $this->mBodytext = '';
1959                 $this->addWikiText( $this->formatPermissionsErrorMessage( $errors, $action ) );
1960         }
1961
1962         /**
1963          * Display an error page indicating that a given version of MediaWiki is
1964          * required to use it
1965          *
1966          * @param $version Mixed: the version of MediaWiki needed to use the page
1967          */
1968         public function versionRequired( $version ) {
1969                 $this->setPageTitle( wfMsg( 'versionrequired', $version ) );
1970                 $this->setHTMLTitle( wfMsg( 'versionrequired', $version ) );
1971                 $this->setRobotPolicy( 'noindex,nofollow' );
1972                 $this->setArticleRelated( false );
1973                 $this->mBodytext = '';
1974
1975                 $this->addWikiMsg( 'versionrequiredtext', $version );
1976                 $this->returnToMain();
1977         }
1978
1979         /**
1980          * Display an error page noting that a given permission bit is required.
1981          *
1982          * @param $permission String: key required
1983          */
1984         public function permissionRequired( $permission ) {
1985                 global $wgLang;
1986
1987                 $this->setPageTitle( wfMsg( 'badaccess' ) );
1988                 $this->setHTMLTitle( wfMsg( 'errorpagetitle' ) );
1989                 $this->setRobotPolicy( 'noindex,nofollow' );
1990                 $this->setArticleRelated( false );
1991                 $this->mBodytext = '';
1992
1993                 $groups = array_map( array( 'User', 'makeGroupLinkWiki' ),
1994                         User::getGroupsWithPermission( $permission ) );
1995                 if( $groups ) {
1996                         $this->addWikiMsg(
1997                                 'badaccess-groups',
1998                                 $wgLang->commaList( $groups ),
1999                                 count( $groups )
2000                         );
2001                 } else {
2002                         $this->addWikiMsg( 'badaccess-group0' );
2003                 }
2004                 $this->returnToMain();
2005         }
2006
2007         /**
2008          * Produce the stock "please login to use the wiki" page
2009          */
2010         public function loginToUse() {
2011                 global $wgUser;
2012
2013                 if( $wgUser->isLoggedIn() ) {
2014                         $this->permissionRequired( 'read' );
2015                         return;
2016                 }
2017
2018                 $skin = $wgUser->getSkin();
2019
2020                 $this->setPageTitle( wfMsg( 'loginreqtitle' ) );
2021                 $this->setHtmlTitle( wfMsg( 'errorpagetitle' ) );
2022                 $this->setRobotPolicy( 'noindex,nofollow' );
2023                 $this->setArticleRelated( false );
2024
2025                 $loginTitle = SpecialPage::getTitleFor( 'Userlogin' );
2026                 $loginLink = $skin->link(
2027                         $loginTitle,
2028                         wfMsgHtml( 'loginreqlink' ),
2029                         array(),
2030                         array( 'returnto' => $this->getTitle()->getPrefixedText() ),
2031                         array( 'known', 'noclasses' )
2032                 );
2033                 $this->addHTML( wfMsgWikiHtml( 'loginreqpagetext', $loginLink ) );
2034                 $this->addHTML( "\n<!--" . $this->getTitle()->getPrefixedUrl() . '-->' );
2035
2036                 # Don't return to the main page if the user can't read it
2037                 # otherwise we'll end up in a pointless loop
2038                 $mainPage = Title::newMainPage();
2039                 if( $mainPage->userCanRead() ) {
2040                         $this->returnToMain( null, $mainPage );
2041                 }
2042         }
2043
2044         /**
2045          * Format a list of error messages
2046          *
2047          * @param $errors An array of arrays returned by Title::getUserPermissionsErrors
2048          * @param $action String: action that was denied or null if unknown
2049          * @return String: the wikitext error-messages, formatted into a list.
2050          */
2051         public function formatPermissionsErrorMessage( $errors, $action = null ) {
2052                 if ( $action == null ) {
2053                         $text = wfMsgNoTrans( 'permissionserrorstext', count( $errors ) ) . "\n\n";
2054                 } else {
2055                         $action_desc = wfMsgNoTrans( "action-$action" );
2056                         $text = wfMsgNoTrans(
2057                                 'permissionserrorstext-withaction',
2058                                 count( $errors ),
2059                                 $action_desc
2060                         ) . "\n\n";
2061                 }
2062
2063                 if ( count( $errors ) > 1 ) {
2064                         $text .= '<ul class="permissions-errors">' . "\n";
2065
2066                         foreach( $errors as $error ) {
2067                                 $text .= '<li>';
2068                                 $text .= call_user_func_array( 'wfMsgNoTrans', $error );
2069                                 $text .= "</li>\n";
2070                         }
2071                         $text .= '</ul>';
2072                 } else {
2073                         $text .= "<div class=\"permissions-errors\">\n" .
2074                                         call_user_func_array( 'wfMsgNoTrans', reset( $errors ) ) .
2075                                         "\n</div>";
2076                 }
2077
2078                 return $text;
2079         }
2080
2081         /**
2082          * Display a page stating that the Wiki is in read-only mode,
2083          * and optionally show the source of the page that the user
2084          * was trying to edit.  Should only be called (for this
2085          * purpose) after wfReadOnly() has returned true.
2086          *
2087          * For historical reasons, this function is _also_ used to
2088          * show the error message when a user tries to edit a page
2089          * they are not allowed to edit.  (Unless it's because they're
2090          * blocked, then we show blockedPage() instead.)  In this
2091          * case, the second parameter should be set to true and a list
2092          * of reasons supplied as the third parameter.
2093          *
2094          * @todo Needs to be split into multiple functions.
2095          *
2096          * @param $source    String: source code to show (or null).
2097          * @param $protected Boolean: is this a permissions error?
2098          * @param $reasons   Array: list of reasons for this error, as returned by Title::getUserPermissionsErrors().
2099          * @param $action    String: action that was denied or null if unknown
2100          */
2101         public function readOnlyPage( $source = null, $protected = false, $reasons = array(), $action = null ) {
2102                 global $wgUser;
2103                 $skin = $wgUser->getSkin();
2104
2105                 $this->setRobotPolicy( 'noindex,nofollow' );
2106                 $this->setArticleRelated( false );
2107
2108                 // If no reason is given, just supply a default "I can't let you do
2109                 // that, Dave" message.  Should only occur if called by legacy code.
2110                 if ( $protected && empty( $reasons ) ) {
2111                         $reasons[] = array( 'badaccess-group0' );
2112                 }
2113
2114                 if ( !empty( $reasons ) ) {
2115                         // Permissions error
2116                         if( $source ) {
2117                                 $this->setPageTitle( wfMsg( 'viewsource' ) );
2118                                 $this->setSubtitle(
2119                                         wfMsg( 'viewsourcefor', $skin->linkKnown( $this->getTitle() ) )
2120                                 );
2121                         } else {
2122                                 $this->setPageTitle( wfMsg( 'badaccess' ) );
2123                         }
2124                         $this->addWikiText( $this->formatPermissionsErrorMessage( $reasons, $action ) );
2125                 } else {
2126                         // Wiki is read only
2127                         $this->setPageTitle( wfMsg( 'readonly' ) );
2128                         $reason = wfReadOnlyReason();
2129                         $this->wrapWikiMsg( "<div class='mw-readonly-error'>\n$1\n</div>", array( 'readonlytext', $reason ) );
2130                 }
2131
2132                 // Show source, if supplied
2133                 if( is_string( $source ) ) {
2134                         $this->addWikiMsg( 'viewsourcetext' );
2135
2136                         $params = array(
2137                                 'id'   => 'wpTextbox1',
2138                                 'name' => 'wpTextbox1',
2139                                 'cols' => $wgUser->getOption( 'cols' ),
2140                                 'rows' => $wgUser->getOption( 'rows' ),
2141                                 'readonly' => 'readonly'
2142                         );
2143                         $this->addHTML( Html::element( 'textarea', $params, $source ) );
2144
2145                         // Show templates used by this article
2146                         $skin = $wgUser->getSkin();
2147                         $article = new Article( $this->getTitle() );
2148                         $this->addHTML( "<div class='templatesUsed'>
2149 {$skin->formatTemplates( $article->getUsedTemplates() )}
2150 </div>
2151 " );
2152                 }
2153
2154                 # If the title doesn't exist, it's fairly pointless to print a return
2155                 # link to it.  After all, you just tried editing it and couldn't, so
2156                 # what's there to do there?
2157                 if( $this->getTitle()->exists() ) {
2158                         $this->returnToMain( null, $this->getTitle() );
2159                 }
2160         }
2161
2162         /**
2163          * Adds JS-based password security checker
2164          * @param $passwordId String ID of input box containing password
2165          * @param $retypeId String ID of input box containing retyped password
2166          * @return none
2167          */
2168         public function addPasswordSecurity( $passwordId, $retypeId ) {
2169                 $data = array(
2170                         'password' => '#' . $passwordId,
2171                         'retype' => '#' . $retypeId,
2172                         'messages' => array(),
2173                 );
2174                 foreach ( array( 'password-strength', 'password-strength-bad', 'password-strength-mediocre',
2175                                 'password-strength-acceptable', 'password-strength-good', 'password-retype', 'password-retype-mismatch'
2176                         ) as $message ) {
2177                         $data['messages'][$message] = wfMsg( $message );
2178                 }
2179                 $this->addScript( Html::inlineScript( 'var passwordSecurity=' . FormatJson::encode( $data ) ) );
2180                 $this->addModules( 'mediawiki.legacy.password' );
2181         }
2182
2183         public function showFatalError( $message ) {
2184                 $this->setPageTitle( wfMsg( 'internalerror' ) );
2185                 $this->setRobotPolicy( 'noindex,nofollow' );
2186                 $this->setArticleRelated( false );
2187                 $this->enableClientCache( false );
2188                 $this->mRedirect = '';
2189                 $this->mBodytext = $message;
2190         }
2191
2192         public function showUnexpectedValueError( $name, $val ) {
2193                 $this->showFatalError( wfMsg( 'unexpected', $name, $val ) );
2194         }
2195
2196         public function showFileCopyError( $old, $new ) {
2197                 $this->showFatalError( wfMsg( 'filecopyerror', $old, $new ) );
2198         }
2199
2200         public function showFileRenameError( $old, $new ) {
2201                 $this->showFatalError( wfMsg( 'filerenameerror', $old, $new ) );
2202         }
2203
2204         public function showFileDeleteError( $name ) {
2205                 $this->showFatalError( wfMsg( 'filedeleteerror', $name ) );
2206         }
2207
2208         public function showFileNotFoundError( $name ) {
2209                 $this->showFatalError( wfMsg( 'filenotfound', $name ) );
2210         }
2211
2212         /**
2213          * Add a "return to" link pointing to a specified title
2214          *
2215          * @param $title Title to link
2216          * @param $query String: query string
2217          * @param $text String text of the link (input is not escaped)
2218          */
2219         public function addReturnTo( $title, $query = array(), $text = null ) {
2220                 global $wgUser;
2221                 $this->addLink( array( 'rel' => 'next', 'href' => $title->getFullURL() ) );
2222                 $link = wfMsgHtml(
2223                         'returnto',
2224                         $wgUser->getSkin()->link( $title, $text, array(), $query )
2225                 );
2226                 $this->addHTML( "<p id=\"mw-returnto\">{$link}</p>\n" );
2227         }
2228
2229         /**
2230          * Add a "return to" link pointing to a specified title,
2231          * or the title indicated in the request, or else the main page
2232          *
2233          * @param $unused No longer used
2234          * @param $returnto Title or String to return to
2235          * @param $returntoquery String: query string for the return to link
2236          */
2237         public function returnToMain( $unused = null, $returnto = null, $returntoquery = null ) {
2238                 global $wgRequest;
2239
2240                 if ( $returnto == null ) {
2241                         $returnto = $wgRequest->getText( 'returnto' );
2242                 }
2243
2244                 if ( $returntoquery == null ) {
2245                         $returntoquery = $wgRequest->getText( 'returntoquery' );
2246                 }
2247
2248                 if ( $returnto === '' ) {
2249                         $returnto = Title::newMainPage();
2250                 }
2251
2252                 if ( is_object( $returnto ) ) {
2253                         $titleObj = $returnto;
2254                 } else {
2255                         $titleObj = Title::newFromText( $returnto );
2256                 }
2257                 if ( !is_object( $titleObj ) ) {
2258                         $titleObj = Title::newMainPage();
2259                 }
2260
2261                 $this->addReturnTo( $titleObj, $returntoquery );
2262         }
2263
2264         /**
2265          * @param $sk Skin The given Skin
2266          * @param $includeStyle Boolean: unused
2267          * @return String: The doctype, opening <html>, and head element.
2268          */
2269         public function headElement( Skin $sk, $includeStyle = true ) {
2270                 global $wgOutputEncoding, $wgMimeType;
2271                 global $wgUseTrackbacks, $wgHtml5;
2272                 global $wgUser, $wgRequest, $wgLang;
2273
2274                 if ( $sk->commonPrintStylesheet() ) {
2275                         $this->addModuleStyles( 'mediawiki.legacy.wikiprintable' );
2276                 }
2277                 $sk->setupUserCss( $this );
2278
2279                 $ret = Html::htmlHeader( array( 'lang' => wfUILang()->getCode() ) );
2280
2281                 if ( $this->getHTMLTitle() == '' ) {
2282                         $this->setHTMLTitle( wfMsg( 'pagetitle', $this->getPageTitle() ) );
2283                 }
2284
2285                 $openHead = Html::openElement( 'head' );
2286                 if ( $openHead ) {
2287                         # Don't bother with the newline if $head == ''
2288                         $ret .= "$openHead\n";
2289                 }
2290
2291                 if ( $wgHtml5 ) {
2292                         # More succinct than <meta http-equiv=Content-Type>, has the
2293                         # same effect
2294                         $ret .= Html::element( 'meta', array( 'charset' => $wgOutputEncoding ) ) . "\n";
2295                 } else {
2296                         $this->addMeta( 'http:Content-Type', "$wgMimeType; charset=$wgOutputEncoding" );
2297                 }
2298
2299                 $ret .= Html::element( 'title', null, $this->getHTMLTitle() ) . "\n";
2300
2301                 $ret .= implode( "\n", array(
2302                         $this->getHeadLinks( $sk ),
2303                         $this->buildCssLinks( $sk ),
2304                         $this->getHeadItems()
2305                 ) );
2306
2307                 if ( $wgUseTrackbacks && $this->isArticleRelated() ) {
2308                         $ret .= $this->getTitle()->trackbackRDF();
2309                 }
2310
2311                 $closeHead = Html::closeElement( 'head' );
2312                 if ( $closeHead ) {
2313                         $ret .= "$closeHead\n";
2314                 }
2315
2316                 $bodyAttrs = array();
2317
2318                 # Crazy edit-on-double-click stuff
2319                 $action = $wgRequest->getVal( 'action', 'view' );
2320
2321                 if (
2322                         $this->getTitle()->getNamespace() != NS_SPECIAL &&
2323                         !in_array( $action, array( 'edit', 'submit' ) ) &&
2324                         $wgUser->getOption( 'editondblclick' )
2325                 )
2326                 {
2327                         $bodyAttrs['ondblclick'] = "document.location = '" . Xml::escapeJsString( $this->getTitle()->getEditURL() ) . "'";
2328                 }
2329
2330                 # Class bloat
2331                 $dir = wfUILang()->getDir();
2332                 $bodyAttrs['class'] = "mediawiki $dir";
2333
2334                 if ( $wgLang->capitalizeAllNouns() ) {
2335                         # A <body> class is probably not the best way to do this . . .
2336                         $bodyAttrs['class'] .= ' capitalize-all-nouns';
2337                 }
2338                 $bodyAttrs['class'] .= ' ns-' . $this->getTitle()->getNamespace();
2339                 if ( $this->getTitle()->getNamespace() == NS_SPECIAL ) {
2340                         $bodyAttrs['class'] .= ' ns-special';
2341                 } elseif ( $this->getTitle()->isTalkPage() ) {
2342                         $bodyAttrs['class'] .= ' ns-talk';
2343                 } else {
2344                         $bodyAttrs['class'] .= ' ns-subject';
2345                 }
2346                 $bodyAttrs['class'] .= ' ' . Sanitizer::escapeClass( 'page-' . $this->getTitle()->getPrefixedText() );
2347                 $bodyAttrs['class'] .= ' skin-' . Sanitizer::escapeClass( $wgUser->getSkin()->getSkinName() );
2348
2349                 $sk->addToBodyAttributes( $this, $bodyAttrs ); // Allow skins to add body attributes they need
2350                 wfRunHooks( 'OutputPageBodyAttributes', array( $this, $sk, &$bodyAttrs ) );
2351
2352                 $ret .= Html::openElement( 'body', $bodyAttrs ) . "\n";
2353
2354                 return $ret;
2355         }
2356
2357         /**
2358          * Get a ResourceLoader object associated with this OutputPage
2359          */
2360         public function getResourceLoader() {
2361                 if ( is_null( $this->mResourceLoader ) ) {
2362                         $this->mResourceLoader = new ResourceLoader();
2363                 }
2364                 return $this->mResourceLoader;
2365         }
2366
2367         /**
2368          * TODO: Document
2369          * @param $skin Skin
2370          * @param $modules Array/string with the module name
2371          * @param $only string May be styles, messages or scripts
2372          * @param $useESI boolean
2373          * @return string html <script> and <style> tags
2374          */
2375         protected function makeResourceLoaderLink( Skin $skin, $modules, $only, $useESI = false ) {
2376                 global $wgUser, $wgLang, $wgLoadScript, $wgResourceLoaderUseESI,
2377                         $wgResourceLoaderInlinePrivateModules, $wgRequest;
2378                 // Lazy-load ResourceLoader
2379                 // TODO: Should this be a static function of ResourceLoader instead?
2380                 // TODO: Divide off modules starting with "user", and add the user parameter to them
2381                 $query = array(
2382                         'lang' => $wgLang->getCode(),
2383                         'debug' => ResourceLoader::inDebugMode() ? 'true' : 'false',
2384                         'skin' => $skin->getSkinName(),
2385                         'only' => $only,
2386                 );
2387                 // Propagate printable and handheld parameters if present
2388                 if ( $wgRequest->getBool( 'printable' ) ) {
2389                         $query['printable'] = 1;
2390                 }
2391                 if ( $wgRequest->getBool( 'handheld' ) ) {
2392                         $query['handheld'] = 1;
2393                 }
2394
2395                 if ( !count( $modules ) ) {
2396                         return '';
2397                 }
2398
2399                 if ( count( $modules ) > 1 ) {
2400                         // Remove duplicate module requests
2401                         $modules = array_unique( (array) $modules );
2402                         // Sort module names so requests are more uniform
2403                         sort( $modules );
2404
2405                         if ( ResourceLoader::inDebugMode() ) {
2406                                 // Recursively call us for every item
2407                                 $links = '';
2408                                 foreach ( $modules as $name ) {
2409                                         $links .= $this->makeResourceLoaderLink( $skin, $name, $only, $useESI );
2410                                 }
2411                                 return $links;
2412                         }
2413                 }
2414
2415                 // Create keyed-by-group list of module objects from modules list
2416                 $groups = array();
2417                 $resourceLoader = $this->getResourceLoader();
2418                 foreach ( (array) $modules as $name ) {
2419                         $module = $resourceLoader->getModule( $name );
2420                         $group = $module->getGroup();
2421                         if ( !isset( $groups[$group] ) ) {
2422                                 $groups[$group] = array();
2423                         }
2424                         $groups[$group][$name] = $module;
2425                 }
2426                 $links = '';
2427                 foreach ( $groups as $group => $modules ) {
2428                         $query['modules'] = implode( '|', array_keys( $modules ) );
2429                         // Special handling for user-specific groups
2430                         if ( ( $group === 'user' || $group === 'private' ) && $wgUser->isLoggedIn() ) {
2431                                 $query['user'] = $wgUser->getName();
2432                         }
2433                         // Support inlining of private modules if configured as such
2434                         if ( $group === 'private' && $wgResourceLoaderInlinePrivateModules ) {
2435                                 $context = new ResourceLoaderContext( $resourceLoader, new FauxRequest( $query ) );
2436                                 if ( $only == 'styles' ) {
2437                                         $links .= Html::inlineStyle(
2438                                                 $resourceLoader->makeModuleResponse( $context, $modules )
2439                                         );
2440                                 } else {
2441                                         $links .= Html::inlineScript(
2442                                                 ResourceLoader::makeLoaderConditionalScript(
2443                                                         $resourceLoader->makeModuleResponse( $context, $modules )
2444                                                 )
2445                                         );
2446                                 }
2447                                 continue;
2448                         }
2449                         // Special handling for user and site groups; because users might change their stuff
2450                         // on-wiki like site or user pages, or user preferences; we need to find the highest
2451                         // timestamp of these user-changable modules so we can ensure cache misses on change
2452                         if ( $group === 'user' || $group === 'site' ) {
2453                                 // Create a fake request based on the one we are about to make so modules return
2454                                 // correct times
2455                                 $context = new ResourceLoaderContext( $resourceLoader, new FauxRequest( $query ) );
2456                                 // Get the maximum timestamp
2457                                 $timestamp = 1;
2458                                 foreach ( $modules as $module ) {
2459                                         $timestamp = max( $timestamp, $module->getModifiedTime( $context ) );
2460                                 }
2461                                 // Add a version parameter so cache will break when things change
2462                                 $query['version'] = wfTimestamp( TS_ISO_8601_BASIC, round( $timestamp, -2 ) );
2463                         }
2464                         // Make queries uniform in order
2465                         ksort( $query );
2466
2467                         $url = wfAppendQuery( $wgLoadScript, $query );
2468                         if ( $useESI && $wgResourceLoaderUseESI ) {
2469                                 $esi = Xml::element( 'esi:include', array( 'src' => $url ) );
2470                                 if ( $only == 'styles' ) {
2471                                         $links .= Html::inlineStyle( $esi );
2472                                 } else {
2473                                         $links .= Html::inlineScript( $esi );
2474                                 }
2475                         } else {
2476                                 // Automatically select style/script elements
2477                                 if ( $only === 'styles' ) {
2478                                         $links .= Html::linkedStyle( wfAppendQuery( $wgLoadScript, $query ) ) . "\n";
2479                                 } else {
2480                                         $links .= Html::linkedScript( wfAppendQuery( $wgLoadScript, $query ) ) . "\n";
2481                                 }
2482                         }
2483                 }
2484                 return $links;
2485         }
2486
2487         /**
2488          * Gets the global variables and mScripts; also adds userjs to the end if
2489          * enabled. Despite the name, these scripts are no longer put in the
2490          * <head> but at the bottom of the <body>
2491          *
2492          * @param $sk Skin object to use
2493          * @return String: HTML fragment
2494          */
2495         function getHeadScripts( Skin $sk ) {
2496                 global $wgUser, $wgRequest, $wgUseSiteJs;
2497
2498                 // Startup - this will immediately load jquery and mediawiki modules
2499                 $scripts = $this->makeResourceLoaderLink( $sk, 'startup', 'scripts', true );
2500
2501                 // Configuration -- This could be merged together with the load and go, but
2502                 // makeGlobalVariablesScript returns a whole script tag -- grumble grumble...
2503                 $scripts .= Skin::makeGlobalVariablesScript( $sk->getSkinName() ) . "\n";
2504
2505                 // Script and Messages "only" requests
2506                 $scripts .= $this->makeResourceLoaderLink( $sk, $this->getModuleScripts(), 'scripts' );
2507                 $scripts .= $this->makeResourceLoaderLink( $sk, $this->getModuleMessages(), 'messages' );
2508
2509                 // Modules requests - let the client calculate dependencies and batch requests as it likes
2510                 if ( $this->getModules() ) {
2511                         $scripts .= Html::inlineScript(
2512                                 ResourceLoader::makeLoaderConditionalScript(
2513                                         Xml::encodeJsCall( 'mediaWiki.loader.load', array( $this->getModules() ) ) .
2514                                         Xml::encodeJsCall( 'mediaWiki.loader.go', array() )
2515                                 )
2516                         ) . "\n";
2517                 }
2518
2519                 // Legacy Scripts
2520                 $scripts .= "\n" . $this->mScripts;
2521
2522                 // Add site JS if enabled
2523                 if ( $wgUseSiteJs ) {
2524                         $scripts .= $this->makeResourceLoaderLink( $sk, 'site', 'scripts' );
2525                 }
2526
2527                 // Add user JS if enabled - trying to load user.options as a bundle if possible
2528                 $userOptionsAdded = false;
2529                 if ( $this->isUserJsAllowed() && $wgUser->isLoggedIn() ) {
2530                         $action = $wgRequest->getVal( 'action', 'view' );
2531                         if( $this->mTitle && $this->mTitle->isJsSubpage() && $sk->userCanPreview( $action ) ) {
2532                                 # XXX: additional security check/prompt?
2533                                 $scripts .= Html::inlineScript( "\n" . $wgRequest->getText( 'wpTextbox1' ) . "\n" ) . "\n";
2534                         } else {
2535                                 $scripts .= $this->makeResourceLoaderLink(
2536                                         $sk, array( 'user', 'user.options' ), 'scripts'
2537                                 );
2538                                 $userOptionsAdded = true;
2539                         }
2540                 }
2541                 if ( !$userOptionsAdded ) {
2542                         $scripts .= $this->makeResourceLoaderLink( $sk, 'user.options', 'scripts' );
2543                 }
2544
2545                 return $scripts;
2546         }
2547
2548         /**
2549          * Add default \<meta\> tags
2550          */
2551         protected function addDefaultMeta() {
2552                 global $wgVersion, $wgHtml5;
2553
2554                 static $called = false;
2555                 if ( $called ) {
2556                         # Don't run this twice
2557                         return;
2558                 }
2559                 $called = true;
2560
2561                 if ( !$wgHtml5 ) {
2562                         $this->addMeta( 'http:Content-Style-Type', 'text/css' ); // bug 15835
2563                 }
2564                 $this->addMeta( 'generator', "MediaWiki $wgVersion" );
2565
2566                 $p = "{$this->mIndexPolicy},{$this->mFollowPolicy}";
2567                 if( $p !== 'index,follow' ) {
2568                         // http://www.robotstxt.org/wc/meta-user.html
2569                         // Only show if it's different from the default robots policy
2570                         $this->addMeta( 'robots', $p );
2571                 }
2572
2573                 if ( count( $this->mKeywords ) > 0 ) {
2574                         $strip = array(
2575                                 "/<.*?" . ">/" => '',
2576                                 "/_/" => ' '
2577                         );
2578                         $this->addMeta(
2579                                 'keywords',
2580                                 preg_replace(
2581                                         array_keys( $strip ),
2582                                         array_values( $strip ),
2583                                         implode( ',', $this->mKeywords )
2584                                 )
2585                         );
2586                 }
2587         }
2588
2589         /**
2590          * @return string HTML tag links to be put in the header.
2591          */
2592         public function getHeadLinks( Skin $sk ) {
2593                 global $wgFeed;
2594
2595                 // Ideally this should happen earlier, somewhere. :P
2596                 $this->addDefaultMeta();
2597
2598                 $tags = array();
2599
2600                 foreach ( $this->mMetatags as $tag ) {
2601                         if ( 0 == strcasecmp( 'http:', substr( $tag[0], 0, 5 ) ) ) {
2602                                 $a = 'http-equiv';
2603                                 $tag[0] = substr( $tag[0], 5 );
2604                         } else {
2605                                 $a = 'name';
2606                         }
2607                         $tags[] = Html::element( 'meta',
2608                                 array(
2609                                         $a => $tag[0],
2610                                         'content' => $tag[1]
2611                                 )
2612                         );
2613                 }
2614                 foreach ( $this->mLinktags as $tag ) {
2615                         $tags[] = Html::element( 'link', $tag );
2616                 }
2617
2618                 if( $wgFeed ) {
2619                         foreach( $this->getSyndicationLinks() as $format => $link ) {
2620                                 # Use the page name for the title (accessed through $wgTitle since
2621                                 # there's no other way).  In principle, this could lead to issues
2622                                 # with having the same name for different feeds corresponding to
2623                                 # the same page, but we can't avoid that at this low a level.
2624
2625                                 $tags[] = $this->feedLink(
2626                                         $format,
2627                                         $link,
2628                                         # Used messages: 'page-rss-feed' and 'page-atom-feed' (for an easier grep)
2629                                         wfMsg( "page-{$format}-feed", $this->getTitle()->getPrefixedText() )
2630                                 );
2631                         }
2632
2633                         # Recent changes feed should appear on every page (except recentchanges,
2634                         # that would be redundant). Put it after the per-page feed to avoid
2635                         # changing existing behavior. It's still available, probably via a
2636                         # menu in your browser. Some sites might have a different feed they'd
2637                         # like to promote instead of the RC feed (maybe like a "Recent New Articles"
2638                         # or "Breaking news" one). For this, we see if $wgOverrideSiteFeed is defined.
2639                         # If so, use it instead.
2640
2641                         global $wgOverrideSiteFeed, $wgSitename, $wgAdvertisedFeedTypes;
2642                         $rctitle = SpecialPage::getTitleFor( 'Recentchanges' );
2643
2644                         if ( $wgOverrideSiteFeed ) {
2645                                 foreach ( $wgOverrideSiteFeed as $type => $feedUrl ) {
2646                                         $tags[] = $this->feedLink(
2647                                                 $type,
2648                                                 htmlspecialchars( $feedUrl ),
2649                                                 wfMsg( "site-{$type}-feed", $wgSitename )
2650                                         );
2651                                 }
2652                         } elseif ( $this->getTitle()->getPrefixedText() != $rctitle->getPrefixedText() ) {
2653                                 foreach ( $wgAdvertisedFeedTypes as $format ) {
2654                                         $tags[] = $this->feedLink(
2655                                                 $format,
2656                                                 $rctitle->getLocalURL( "feed={$format}" ),
2657                                                 wfMsg( "site-{$format}-feed", $wgSitename ) # For grep: 'site-rss-feed', 'site-atom-feed'.
2658                                         );
2659                                 }
2660                         }
2661                 }
2662                 return implode( "\n", $tags );
2663         }
2664
2665         /**
2666          * Generate a <link rel/> for a feed.
2667          *
2668          * @param $type String: feed type
2669          * @param $url String: URL to the feed
2670          * @param $text String: value of the "title" attribute
2671          * @return String: HTML fragment
2672          */
2673         private function feedLink( $type, $url, $text ) {
2674                 return Html::element( 'link', array(
2675                         'rel' => 'alternate',
2676                         'type' => "application/$type+xml",
2677                         'title' => $text,
2678                         'href' => $url )
2679                 );
2680         }
2681
2682         /**
2683          * Add a local or specified stylesheet, with the given media options.
2684          * Meant primarily for internal use...
2685          *
2686          * @param $style String: URL to the file
2687          * @param $media String: to specify a media type, 'screen', 'printable', 'handheld' or any.
2688          * @param $condition String: for IE conditional comments, specifying an IE version
2689          * @param $dir String: set to 'rtl' or 'ltr' for direction-specific sheets
2690          */
2691         public function addStyle( $style, $media = '', $condition = '', $dir = '' ) {
2692                 $options = array();
2693                 // Even though we expect the media type to be lowercase, but here we
2694                 // force it to lowercase to be safe.
2695                 if( $media ) {
2696                         $options['media'] = $media;
2697                 }
2698                 if( $condition ) {
2699                         $options['condition'] = $condition;
2700                 }
2701                 if( $dir ) {
2702                         $options['dir'] = $dir;
2703                 }
2704                 $this->styles[$style] = $options;
2705         }
2706
2707         /**
2708          * Adds inline CSS styles
2709          * @param $style_css Mixed: inline CSS
2710          */
2711         public function addInlineStyle( $style_css ){
2712                 $this->mInlineStyles .= Html::inlineStyle( $style_css );
2713         }
2714
2715         /**
2716          * Build a set of <link>s for the stylesheets specified in the $this->styles array.
2717          * These will be applied to various media & IE conditionals.
2718          * @param $sk Skin object
2719          */
2720         public function buildCssLinks( $sk ) {
2721                 $ret = '';
2722                 // Add ResourceLoader styles
2723                 // Split the styles into three groups
2724                 $styles = array( 'other' => array(), 'user' => array(), 'site' => array() );
2725                 $resourceLoader = $this->getResourceLoader();
2726                 foreach ( $this->getModuleStyles() as $name ) {
2727                         $group = $resourceLoader->getModule( $name )->getGroup();
2728                         // Modules in groups named "other" or anything different than "user" or "site" will
2729                         // be placed in the "other" group
2730                         $styles[isset( $styles[$group] ) ? $group : 'other'][] = $name;
2731                 }
2732
2733                 // We want site and user styles to override dynamically added styles from modules, but we want
2734                 // dynamically added styles to override statically added styles from other modules. So the order
2735                 // has to be other, dynamic, site, user
2736                 // Add statically added styles for other modules
2737                 $ret .= $this->makeResourceLoaderLink( $sk, $styles['other'], 'styles' );
2738                 // Add normal styles added through addStyle()/addInlineStyle() here
2739                 $ret .= implode( "\n", $this->buildCssLinksArray() ) . $this->mInlineStyles;
2740                 // Add marker tag to mark the place where the client-side loader should inject dynamic styles
2741                 // We use a <meta> tag with a made-up name for this because that's valid HTML
2742                 $ret .= Html::element( 'meta', array( 'name' => 'ResourceLoaderDynamicStyles', 'content' => '' ) );
2743                 // Add site and user styles
2744                 $ret .= $this->makeResourceLoaderLink(
2745                         $sk, array_merge( $styles['site'], $styles['user'] ), 'styles'
2746                 );
2747                 return $ret;
2748         }
2749
2750         public function buildCssLinksArray() {
2751                 $links = array();
2752                 foreach( $this->styles as $file => $options ) {
2753                         $link = $this->styleLink( $file, $options );
2754                         if( $link ) {
2755                                 $links[$file] = $link;
2756                         }
2757                 }
2758                 return $links;
2759         }
2760
2761         /**
2762          * Generate \<link\> tags for stylesheets
2763          *
2764          * @param $style String: URL to the file
2765          * @param $options Array: option, can contain 'condition', 'dir', 'media'
2766          *                 keys
2767          * @return String: HTML fragment
2768          */
2769         protected function styleLink( $style, $options ) {
2770                 if( isset( $options['dir'] ) ) {
2771                         $siteDir = wfUILang()->getDir();
2772                         if( $siteDir != $options['dir'] ) {
2773                                 return '';
2774                         }
2775                 }
2776
2777                 if( isset( $options['media'] ) ) {
2778                         $media = self::transformCssMedia( $options['media'] );
2779                         if( is_null( $media ) ) {
2780                                 return '';
2781                         }
2782                 } else {
2783                         $media = 'all';
2784                 }
2785
2786                 if( substr( $style, 0, 1 ) == '/' ||
2787                         substr( $style, 0, 5 ) == 'http:' ||
2788                         substr( $style, 0, 6 ) == 'https:' ) {
2789                         $url = $style;
2790                 } else {
2791                         global $wgStylePath, $wgStyleVersion;
2792                         $url = $wgStylePath . '/' . $style . '?' . $wgStyleVersion;
2793                 }
2794
2795                 $link = Html::linkedStyle( $url, $media );
2796
2797                 if( isset( $options['condition'] ) ) {
2798                         $condition = htmlspecialchars( $options['condition'] );
2799                         $link = "<!--[if $condition]>$link<![endif]-->";
2800                 }
2801                 return $link;
2802         }
2803
2804         /**
2805          * Transform "media" attribute based on request parameters
2806          *
2807          * @param $media String: current value of the "media" attribute
2808          * @return String: modified value of the "media" attribute
2809          */
2810         public static function transformCssMedia( $media ) {
2811                 global $wgRequest, $wgHandheldForIPhone;
2812
2813                 // Switch in on-screen display for media testing
2814                 $switches = array(
2815                         'printable' => 'print',
2816                         'handheld' => 'handheld',
2817                 );
2818                 foreach( $switches as $switch => $targetMedia ) {
2819                         if( $wgRequest->getBool( $switch ) ) {
2820                                 if( $media == $targetMedia ) {
2821                                         $media = '';
2822                                 } elseif( $media == 'screen' ) {
2823                                         return null;
2824                                 }
2825                         }
2826                 }
2827
2828                 // Expand longer media queries as iPhone doesn't grok 'handheld'
2829                 if( $wgHandheldForIPhone ) {
2830                         $mediaAliases = array(
2831                                 'screen' => 'screen and (min-device-width: 481px)',
2832                                 'handheld' => 'handheld, only screen and (max-device-width: 480px)',
2833                         );
2834
2835                         if( isset( $mediaAliases[$media] ) ) {
2836                                 $media = $mediaAliases[$media];
2837                         }
2838                 }
2839
2840                 return $media;
2841         }
2842
2843         /**
2844          * Turn off regular page output and return an error reponse
2845          * for when rate limiting has triggered.
2846          */
2847         public function rateLimited() {
2848                 $this->setPageTitle( wfMsg( 'actionthrottled' ) );
2849                 $this->setRobotPolicy( 'noindex,follow' );
2850                 $this->setArticleRelated( false );
2851                 $this->enableClientCache( false );
2852                 $this->mRedirect = '';
2853                 $this->clearHTML();
2854                 $this->setStatusCode( 503 );
2855                 $this->addWikiMsg( 'actionthrottledtext' );
2856
2857                 $this->returnToMain( null, $this->getTitle() );
2858         }
2859
2860         /**
2861          * Show a warning about slave lag
2862          *
2863          * If the lag is higher than $wgSlaveLagCritical seconds,
2864          * then the warning is a bit more obvious. If the lag is
2865          * lower than $wgSlaveLagWarning, then no warning is shown.
2866          *
2867          * @param $lag Integer: slave lag
2868          */
2869         public function showLagWarning( $lag ) {
2870                 global $wgSlaveLagWarning, $wgSlaveLagCritical, $wgLang;
2871                 if( $lag >= $wgSlaveLagWarning ) {
2872                         $message = $lag < $wgSlaveLagCritical
2873                                 ? 'lag-warn-normal'
2874                                 : 'lag-warn-high';
2875                         $wrap = Html::rawElement( 'div', array( 'class' => "mw-{$message}" ), "\n$1\n" );
2876                         $this->wrapWikiMsg( "$wrap\n", array( $message, $wgLang->formatNum( $lag ) ) );
2877                 }
2878         }
2879
2880         /**
2881          * Add a wikitext-formatted message to the output.
2882          * This is equivalent to:
2883          *
2884          *    $wgOut->addWikiText( wfMsgNoTrans( ... ) )
2885          */
2886         public function addWikiMsg( /*...*/ ) {
2887                 $args = func_get_args();
2888                 $name = array_shift( $args );
2889                 $this->addWikiMsgArray( $name, $args );
2890         }
2891
2892         /**
2893          * Add a wikitext-formatted message to the output.
2894          * Like addWikiMsg() except the parameters are taken as an array
2895          * instead of a variable argument list.
2896          *
2897          * $options is passed through to wfMsgExt(), see that function for details.
2898          */
2899         public function addWikiMsgArray( $name, $args, $options = array() ) {
2900                 $options[] = 'parse';
2901                 $text = wfMsgExt( $name, $options, $args );
2902                 $this->addHTML( $text );
2903         }
2904
2905         /**
2906          * This function takes a number of message/argument specifications, wraps them in
2907          * some overall structure, and then parses the result and adds it to the output.
2908          *
2909          * In the $wrap, $1 is replaced with the first message, $2 with the second, and so
2910          * on. The subsequent arguments may either be strings, in which case they are the
2911          * message names, or arrays, in which case the first element is the message name,
2912          * and subsequent elements are the parameters to that message.
2913          *
2914          * The special named parameter 'options' in a message specification array is passed
2915          * through to the $options parameter of wfMsgExt().
2916          *
2917          * Don't use this for messages that are not in users interface language.
2918          *
2919          * For example:
2920          *
2921          *    $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>", 'some-error' );
2922          *
2923          * Is equivalent to:
2924          *
2925          *    $wgOut->addWikiText( "<div class='error'>\n" . wfMsgNoTrans( 'some-error' ) . "\n</div>" );
2926          *
2927          * The newline after opening div is needed in some wikitext. See bug 19226.
2928          */
2929         public function wrapWikiMsg( $wrap /*, ...*/ ) {
2930                 $msgSpecs = func_get_args();
2931                 array_shift( $msgSpecs );
2932                 $msgSpecs = array_values( $msgSpecs );
2933                 $s = $wrap;
2934                 foreach ( $msgSpecs as $n => $spec ) {
2935                         $options = array();
2936                         if ( is_array( $spec ) ) {
2937                                 $args = $spec;
2938                                 $name = array_shift( $args );
2939                                 if ( isset( $args['options'] ) ) {
2940                                         $options = $args['options'];
2941                                         unset( $args['options'] );
2942                                 }
2943                         }  else {
2944                                 $args = array();
2945                                 $name = $spec;
2946                         }
2947                         $s = str_replace( '$' . ( $n + 1 ), wfMsgExt( $name, $options, $args ), $s );
2948                 }
2949                 $this->addHTML( $this->parse( $s, /*linestart*/true, /*uilang*/true ) );
2950         }
2951
2952         /**
2953          * Include jQuery core. Use this to avoid loading it multiple times
2954          * before we get a usable script loader.
2955          *
2956          * @param $modules Array: list of jQuery modules which should be loaded
2957          * @return Array: the list of modules which were not loaded.
2958          * @since 1.16
2959          * @deprecated @since 1.17
2960          */
2961         public function includeJQuery( $modules = array() ) {
2962                 return array();
2963         }
2964
2965 }