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 add <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 ressource loader.
  31         var $mExtStyles = array();
  32
  33         // should be private. We got set/get accessors. Set 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> tg
  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 article subtitle.
  62          *
  63          * Example: 'From Wikipedia, the free encyclopedia'
  64         var $mSubtitle = '';
  65
  66         var $mRedirect = '';
  67         var $mStatusCode;
  68
  69         // mLastModified and mEtag are used for sending cache control.
  70         // The whole caching system should probably be moved in its own class.
  71         var $mLastModified = '';
  72
  73         /*
  74          * Should be private. No getter but used in sendCacheControl();
  75          * Contains an HTTP Entity Tags (see RFC 2616 section 3.13) which is used
  76          * as a unique identifier for the content. It is later used by the client
  77          * to compare its cache version with the server version. Client sends
  78          * headers If-Match and If-None-Match containing its local cache ETAG value.
  79          *
  80          * To get more information, you will have to look at HTTP1/1 protocols which
  81          * is properly described in RFC 2616 : http://tools.ietf.org/html/rfc2616
  82          */
  83         var $mETag = false;
  84
  85         var $mCategoryLinks = array();
  86         var $mCategories = array();
  87
  88         // Should be private. Associative array mapping language code to the page name
  89         var $mLanguageLinks = array();
  90
  91         /*
  92          * Should be private. Used for javascript (or VB?)
  93          * We should split js / css.
  94          * mScripts content is inserted as is in <head> by Skin. This might contains
  95          * either a link to a stylesheet or inline css.
  96          */
  97         var $mScripts = '';
  98         var $mInlineStyles = ''; // ???
  99
 100         //
 101         var $mLinkColours;
 102
 103         /**
 104          * Used by skin template.
 105          * Example: $tpl->set( 'displaytitle', $out->mPageLinkTitle );
 106          */
 107         var $mPageLinkTitle = '';
 108
 109         // Array of <head> elements. Parser might add its own headers!
 110         var $mHeadItems = array();
 111
 112         // Next variables probably comes from the ressource loader @todo FIXME
 113         var $mModules = array(), $mModuleScripts = array(), $mModuleStyles = array(), $mModuleMessages = array();
 114         var $mResourceLoader;
 115
 116         /** @fixme is this still used ?*/
 117         var $mInlineMsg = array();
 118
 119         var $mTemplateIds = array();
 120
 121         // Initialized with a global value. Let us override it.
 122         // Should probably get deleted / rewritten ...
 123         var $mAllowUserJs;
 124
 125         /*
 126          * This was for the old skins and for users with 640x480 screen.
 127          * Please note old sckins are still used and might prove useful for
 128          * users having old computers or visually impaired.
 129          */
 130         var $mSuppressQuickbar = false;
 131
 132         /**
 133          * @EasterEgg I just love the name for this self documenting variable.
 134          * @todo document
 135          */
 136         var $mDoNothing = false;
 137
 138         // Parser related.
 139         var $mContainsOldMagic = 0, $mContainsNewMagic = 0;
 140
 141         /*
 142          * should be private. Has get/set methods properly documented.
 143          * Stores "article flag" toggle.
 144          */
 145         var $mIsArticleRelated = true;
 146
 147         // lazy initialised, use parserOptions()
 148         protected $mParserOptions = null;
 149
 150         /*
 151          * Handles the atom / rss links.
 152          * We probably only support atom in 2011.
 153          * Looks like a private variable.
 154          */
 155         var $mFeedLinks = array();
 156
 157         // Gwicke work on squid caching? Roughly from 2003.
 158         var $mEnableClientCache = true;
 159
 160         /*
 161          * Flag if output should only contain the body of the article.
 162          * Should be private.
 163          */
 164         var $mArticleBodyOnly = false;
 165
 166         var $mNewSectionLink = false;
 167         var $mHideNewSectionLink = false;
 168
 169         /*
 170          * Comes from the parser. This was probably made to laod CSS/JS only
 171          * if we had <gallery>. Used directly in CategoryPage.php
 172          * Looks like resource loader can replace this.
 173          */
 174         var $mNoGallery = false;
 175
 176         // should be private.
 177         var $mPageTitleActionText = '';
 178         var $mParseWarnings = array();
 179
 180         // Cache stuff. Looks like mEnableClientCache
 181         var $mSquidMaxage = 0;
 182
 183         // @todo document
 184         var $mPreventClickjacking = true;
 185
 186         // should be private. To include the variable {{REVISIONID}}
 187         var $mRevisionId = null;
 188
 189         // Stores a Title object.
 190         protected $mTitle = null;
 191
 192         /**
 193          * An array of stylesheet filenames (relative from skins path), with options
 194          * for CSS media, IE conditions, and RTL/LTR direction.
 195          * For internal use; add settings in the skin via $this->addStyle()
 196          *
 197          * Style again! This seems like a code duplication since we already have
 198          * mStyles. This is what makes OpenSource amazing.
 199          */
 200         var $styles = array();
 201
 202         /**
 203          * Whether to load jQuery core.
 204          */
 205         protected $mJQueryDone = false;
 206
 207         private $mIndexPolicy = 'index';
 208         private $mFollowPolicy = 'follow';
 209         private $mVaryHeader = array(
 210                 'Accept-Encoding' => array( 'list-contains=gzip' ),
 211                 'Cookie' => null
 212         );
 213
 214         /**
 215          * Constructor
 216          * Initialise private variables
 217          */
 218         function __construct() {
 219                 global $wgAllowUserJs;
 220                 $this->mAllowUserJs = $wgAllowUserJs;
 221         }
 222
 223         /**
 224          * Redirect to $url rather than displaying the normal page
 225          *
 226          * @param $url String: URL
 227          * @param $responsecode String: HTTP status code
 228          */
 229         public function redirect( $url, $responsecode = '302' ) {
 230                 # Strip newlines as a paranoia check for header injection in PHP<5.1.2
 231                 $this->mRedirect = str_replace( "\n", '', $url );
 232                 $this->mRedirectCode = $responsecode;
 233         }
 234
 235         /**
 236          * Get the URL to redirect to, or an empty string if not redirect URL set
 237          *
 238          * @return String
 239          */
 240         public function getRedirect() {
 241                 return $this->mRedirect;
 242         }
 243
 244         /**
 245          * Set the HTTP status code to send with the output.
 246          *
 247          * @param $statusCode Integer
 248          * @return nothing
 249          */
 250         public function setStatusCode( $statusCode ) {
 251                 $this->mStatusCode = $statusCode;
 252         }
 253
 254         /**
 255          * Add a new <meta> tag
 256          * To add an http-equiv meta tag, precede the name with "http:"
 257          *
 258          * @param $name tag name
 259          * @param $val tag value
 260          */
 261         function addMeta( $name, $val ) {
 262                 array_push( $this->mMetatags, array( $name, $val ) );
 263         }
 264
 265         /**
 266          * Add a keyword or a list of keywords in the page header
 267          *
 268          * @param $text String or array of strings
 269          */
 270         function addKeyword( $text ) {
 271                 if( is_array( $text ) ) {
 272                         $this->mKeywords = array_merge( $this->mKeywords, $text );
 273                 } else {
 274                         array_push( $this->mKeywords, $text );
 275                 }
 276         }
 277
 278         /**
 279          * Add a new \<link\> tag to the page header
 280          *
 281          * @param $linkarr Array: associative array of attributes.
 282          */
 283         function addLink( $linkarr ) {
 284                 array_push( $this->mLinktags, $linkarr );
 285         }
 286
 287         /**
 288          * Add a new \<link\> with "rel" attribute set to "meta"
 289          *
 290          * @param $linkarr Array: associative array mapping attribute names to their
 291          *                 values, both keys and values will be escaped, and the
 292          *                 "rel" attribute will be automatically added
 293          */
 294         function addMetadataLink( $linkarr ) {
 295                 # note: buggy CC software only reads first "meta" link
 296                 static $haveMeta = false;
 297                 $linkarr['rel'] = $haveMeta ? 'alternate meta' : 'meta';
 298                 $this->addLink( $linkarr );
 299                 $haveMeta = true;
 300         }
 301
 302         /**
 303          * Add raw HTML to the list of scripts (including \<script\> tag, etc.)
 304          *
 305          * @param $script String: raw HTML
 306          */
 307         function addScript( $script ) {
 308                 $this->mScripts .= $script . "\n";
 309         }
 310
 311         /**
 312          * Register and add a stylesheet from an extension directory.
 313          *
 314          * @param $url String path to sheet.  Provide either a full url (beginning
 315          *             with 'http', etc) or a relative path from the document root
 316          *             (beginning with '/').  Otherwise it behaves identically to
 317          *             addStyle() and draws from the /skins folder.
 318          */
 319         public function addExtensionStyle( $url ) {
 320                 array_push( $this->mExtStyles, $url );
 321         }
 322
 323         /**
 324          * Get all links added by extensions
 325          *
 326          * @return Array
 327          */
 328         function getExtStyle() {
 329                 return $this->mExtStyles;
 330         }
 331
 332         /**
 333          * Add a JavaScript file out of skins/common, or a given relative path.
 334          *
 335          * @param $file String: filename in skins/common or complete on-server path
 336          *              (/foo/bar.js)
 337          * @param $version String: style version of the file. Defaults to $wgStyleVersion
 338          */
 339         public function addScriptFile( $file, $version = null ) {
 340                 global $wgStylePath, $wgStyleVersion;
 341                 // See if $file parameter is an absolute URL or begins with a slash
 342                 if( substr( $file, 0, 1 ) == '/' || preg_match( '#^[a-z]*://#i', $file ) ) {
 343                         $path = $file;
 344                 } else {
 345                         $path = "{$wgStylePath}/common/{$file}";
 346                 }
 347                 if ( is_null( $version ) )
 348                         $version = $wgStyleVersion;
 349                 $this->addScript( Html::linkedScript( wfAppendQuery( $path, $version ) ) );
 350         }
 351
 352         /**
 353          * Add a self-contained script tag with the given contents
 354          *
 355          * @param $script String: JavaScript text, no <script> tags
 356          */
 357         public function addInlineScript( $script ) {
 358                 $this->mScripts .= Html::inlineScript( "\n$script\n" ) . "\n";
 359         }
 360
 361         /**
 362          * Get all registered JS and CSS tags for the header.
 363          *
 364          * @return String
 365          */
 366         function getScript() {
 367                 return $this->mScripts . $this->getHeadItems();
 368         }
 369
 370         /**
 371          * Get the list of modules to include on this page
 372          *
 373          * @return Array of module names
 374          */
 375         public function getModules() {
 376                 return array_values( array_unique( $this->mModules ) );
 377         }
 378
 379         /**
 380          * Add one or more modules recognized by the resource loader. Modules added
 381          * through this function will be loaded by the resource loader when the
 382          * page loads.
 383          *
 384          * @param $modules Mixed: module name (string) or array of module names
 385          */
 386         public function addModules( $modules ) {
 387                 $this->mModules = array_merge( $this->mModules, (array)$modules );
 388         }
 389
 390         /**
 391          * Get the list of module JS to include on this page
 392          * @return array of module names
 393          */
 394         public function getModuleScripts() {
 395                 return array_values( array_unique( $this->mModuleScripts ) );
 396         }
 397
 398         /**
 399          * Add only JS of one or more modules recognized by the resource loader. Module
 400          * scripts added through this function will be loaded by the resource loader when
 401          * the page loads.
 402          *
 403          * @param $modules Mixed: module name (string) or array of module names
 404          */
 405         public function addModuleScripts( $modules ) {
 406                 $this->mModuleScripts = array_merge( $this->mModuleScripts, (array)$modules );
 407         }
 408
 409         /**
 410          * Get the list of module CSS to include on this page
 411          *
 412          * @return Array of module names
 413          */
 414         public function getModuleStyles() {
 415                 return array_values( array_unique( $this->mModuleStyles ) );
 416         }
 417
 418         /**
 419          * Add only CSS of one or more modules recognized by the resource loader. Module
 420          * styles added through this function will be loaded by the resource loader when
 421          * the page loads.
 422          *
 423          * @param $modules Mixed: module name (string) or array of module names
 424          */
 425         public function addModuleStyles( $modules ) {
 426                 $this->mModuleStyles = array_merge( $this->mModuleStyles, (array)$modules );
 427         }
 428
 429         /**
 430          * Get the list of module messages to include on this page
 431          *
 432          * @return Array of module names
 433          */
 434         public function getModuleMessages() {
 435                 return array_values( array_unique( $this->mModuleMessages ) );
 436         }
 437
 438         /**
 439          * Add only messages of one or more modules recognized by the resource loader.
 440          * Module messages added through this function will be loaded by the resource
 441          * loader when the page loads.
 442          *
 443          * @param $modules Mixed: module name (string) or array of module names
 444          */
 445         public function addModuleMessages( $modules ) {
 446                 $this->mModuleMessages = array_merge( $this->mModuleMessages, (array)$modules );
 447         }
 448
 449         /**
 450          * Get all header items in a string
 451          *
 452          * @return String
 453          */
 454         function getHeadItems() {
 455                 $s = '';
 456                 foreach ( $this->mHeadItems as $item ) {
 457                         $s .= $item;
 458                 }
 459                 return $s;
 460         }
 461
 462         /**
 463          * Add or replace an header item to the output
 464          *
 465          * @param $name String: item name
 466          * @param $value String: raw HTML
 467          */
 468         public function addHeadItem( $name, $value ) {
 469                 $this->mHeadItems[$name] = $value;
 470         }
 471
 472         /**
 473          * Check if the header item $name is already set
 474          *
 475          * @param $name String: item name
 476          * @return Boolean
 477          */
 478         public function hasHeadItem( $name ) {
 479                 return isset( $this->mHeadItems[$name] );
 480         }
 481
 482         /**
 483          * Set the value of the ETag HTTP header, only used if $wgUseETag is true
 484          *
 485          * @param $tag String: value of "ETag" header
 486          */
 487         function setETag( $tag ) {
 488                 $this->mETag = $tag;
 489         }
 490
 491         /**
 492          * Set whether the output should only contain the body of the article,
 493          * without any skin, sidebar, etc.
 494          * Used e.g. when calling with "action=render".
 495          *
 496          * @param $only Boolean: whether to output only the body of the article
 497          */
 498         public function setArticleBodyOnly( $only ) {
 499                 $this->mArticleBodyOnly = $only;
 500         }
 501
 502         /**
 503          * Return whether the output will contain only the body of the article
 504          *
 505          * @return Boolean
 506          */
 507         public function getArticleBodyOnly() {
 508                 return $this->mArticleBodyOnly;
 509         }
 510
 511         /**
 512          * checkLastModified tells the client to use the client-cached page if
 513          * possible. If sucessful, the OutputPage is disabled so that
 514          * any future call to OutputPage->output() have no effect.
 515          *
 516          * Side effect: sets mLastModified for Last-Modified header
 517          *
 518          * @return Boolean: true iff cache-ok headers was sent.
 519          */
 520         public function checkLastModified( $timestamp ) {
 521                 global $wgCachePages, $wgCacheEpoch, $wgUser, $wgRequest;
 522
 523                 if ( !$timestamp || $timestamp == '19700101000000' ) {
 524                         wfDebug( __METHOD__ . ": CACHE DISABLED, NO TIMESTAMP\n" );
 525                         return false;
 526                 }
 527                 if( !$wgCachePages ) {
 528                         wfDebug( __METHOD__ . ": CACHE DISABLED\n", false );
 529                         return false;
 530                 }
 531                 if( $wgUser->getOption( 'nocache' ) ) {
 532                         wfDebug( __METHOD__ . ": USER DISABLED CACHE\n", false );
 533                         return false;
 534                 }
 535
 536                 $timestamp = wfTimestamp( TS_MW, $timestamp );
 537                 $modifiedTimes = array(
 538                         'page' => $timestamp,
 539                         'user' => $wgUser->getTouched(),
 540                         'epoch' => $wgCacheEpoch
 541                 );
 542                 wfRunHooks( 'OutputPageCheckLastModified', array( &$modifiedTimes ) );
 543
 544                 $maxModified = max( $modifiedTimes );
 545                 $this->mLastModified = wfTimestamp( TS_RFC2822, $maxModified );
 546
 547                 if( empty( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) ) {
 548                         wfDebug( __METHOD__ . ": client did not send If-Modified-Since header\n", false );
 549                         return false;
 550                 }
 551
 552                 # Make debug info
 553                 $info = '';
 554                 foreach ( $modifiedTimes as $name => $value ) {
 555                         if ( $info !== '' ) {
 556                                 $info .= ', ';
 557                         }
 558                         $info .= "$name=" . wfTimestamp( TS_ISO_8601, $value );
 559                 }
 560
 561                 # IE sends sizes after the date like this:
 562                 # Wed, 20 Aug 2003 06:51:19 GMT; length=5202
 563                 # this breaks strtotime().
 564                 $clientHeader = preg_replace( '/;.*$/', '', $_SERVER["HTTP_IF_MODIFIED_SINCE"] );
 565
 566                 wfSuppressWarnings(); // E_STRICT system time bitching
 567                 $clientHeaderTime = strtotime( $clientHeader );
 568                 wfRestoreWarnings();
 569                 if ( !$clientHeaderTime ) {
 570                         wfDebug( __METHOD__ . ": unable to parse the client's If-Modified-Since header: $clientHeader\n" );
 571                         return false;
 572                 }
 573                 $clientHeaderTime = wfTimestamp( TS_MW, $clientHeaderTime );
 574
 575                 wfDebug( __METHOD__ . ": client sent If-Modified-Since: " .
 576                         wfTimestamp( TS_ISO_8601, $clientHeaderTime ) . "\n", false );
 577                 wfDebug( __METHOD__ . ": effective Last-Modified: " .
 578                         wfTimestamp( TS_ISO_8601, $maxModified ) . "\n", false );
 579                 if( $clientHeaderTime < $maxModified ) {
 580                         wfDebug( __METHOD__ . ": STALE, $info\n", false );
 581                         return false;
 582                 }
 583
 584                 # Not modified
 585                 # Give a 304 response code and disable body output
 586                 wfDebug( __METHOD__ . ": NOT MODIFIED, $info\n", false );
 587                 ini_set( 'zlib.output_compression', 0 );
 588                 $wgRequest->response()->header( "HTTP/1.1 304 Not Modified" );
 589                 $this->sendCacheControl();
 590                 $this->disable();
 591
 592                 // Don't output a compressed blob when using ob_gzhandler;
 593                 // it's technically against HTTP spec and seems to confuse
 594                 // Firefox when the response gets split over two packets.
 595                 wfClearOutputBuffers();
 596
 597                 return true;
 598         }
 599
 600         /**
 601          * Override the last modified timestamp
 602          *
 603          * @param $timestamp String: new timestamp, in a format readable by
 604          *        wfTimestamp()
 605          */
 606         public function setLastModified( $timestamp ) {
 607                 $this->mLastModified = wfTimestamp( TS_RFC2822, $timestamp );
 608         }
 609
 610         /**
 611          * Set the robot policy for the page: <http://www.robotstxt.org/meta.html>
 612          *
 613          * @param $policy String: the literal string to output as the contents of
 614          *   the meta tag.  Will be parsed according to the spec and output in
 615          *   standardized form.
 616          * @return null
 617          */
 618         public function setRobotPolicy( $policy ) {
 619                 $policy = Article::formatRobotPolicy( $policy );
 620
 621                 if( isset( $policy['index'] ) ) {
 622                         $this->setIndexPolicy( $policy['index'] );
 623                 }
 624                 if( isset( $policy['follow'] ) ) {
 625                         $this->setFollowPolicy( $policy['follow'] );
 626                 }
 627         }
 628
 629         /**
 630          * Set the index policy for the page, but leave the follow policy un-
 631          * touched.
 632          *
 633          * @param $policy string Either 'index' or 'noindex'.
 634          * @return null
 635          */
 636         public function setIndexPolicy( $policy ) {
 637                 $policy = trim( $policy );
 638                 if( in_array( $policy, array( 'index', 'noindex' ) ) ) {
 639                         $this->mIndexPolicy = $policy;
 640                 }
 641         }
 642
 643         /**
 644          * Set the follow policy for the page, but leave the index policy un-
 645          * touched.
 646          *
 647          * @param $policy String: either 'follow' or 'nofollow'.
 648          * @return null
 649          */
 650         public function setFollowPolicy( $policy ) {
 651                 $policy = trim( $policy );
 652                 if( in_array( $policy, array( 'follow', 'nofollow' ) ) ) {
 653                         $this->mFollowPolicy = $policy;
 654                 }
 655         }
 656
 657         /**
 658          * Set the new value of the "action text", this will be added to the
 659          * "HTML title", separated from it with " - ".
 660          *
 661          * @param $text String: new value of the "action text"
 662          */
 663         public function setPageTitleActionText( $text ) {
 664                 $this->mPageTitleActionText = $text;
 665         }
 666
 667         /**
 668          * Get the value of the "action text"
 669          *
 670          * @return String
 671          */
 672         public function getPageTitleActionText() {
 673                 if ( isset( $this->mPageTitleActionText ) ) {
 674                         return $this->mPageTitleActionText;
 675                 }
 676         }
 677
 678         /**
 679          * "HTML title" means the contents of <title>.
 680          * It is stored as plain, unescaped text and will be run through htmlspecialchars in the skin file.
 681          */
 682         public function setHTMLTitle( $name ) {
 683                 $this->mHTMLtitle = $name;
 684         }
 685
 686         /**
 687          * Return the "HTML title", i.e. the content of the <title> tag.
 688          *
 689          * @return String
 690          */
 691         public function getHTMLTitle() {
 692                 return $this->mHTMLtitle;
 693         }
 694
 695         /**
 696          * "Page title" means the contents of \<h1\>. It is stored as a valid HTML fragment.
 697          * This function allows good tags like \<sup\> in the \<h1\> tag, but not bad tags like \<script\>.
 698          * This function automatically sets \<title\> to the same content as \<h1\> but with all tags removed.
 699          * Bad tags that were escaped in \<h1\> will still be escaped in \<title\>, and good tags like \<i\> will be dropped entirely.
 700          */
 701         public function setPageTitle( $name ) {
 702                 # change "<script>foo&bar</script>" to "&lt;script&gt;foo&amp;bar&lt;/script&gt;"
 703                 # but leave "<i>foobar</i>" alone
 704                 $nameWithTags = Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags( $name ) );
 705                 $this->mPagetitle = $nameWithTags;
 706
 707                 # change "<i>foo&amp;bar</i>" to "foo&bar"
 708                 $this->setHTMLTitle( wfMsg( 'pagetitle', Sanitizer::stripAllTags( $nameWithTags ) ) );
 709         }
 710
 711         /**
 712          * Return the "page title", i.e. the content of the \<h1\> tag.
 713          *
 714          * @return String
 715          */
 716         public function getPageTitle() {
 717                 return $this->mPagetitle;
 718         }
 719
 720         /**
 721          * Set the Title object to use
 722          *
 723          * @param $t Title object
 724          */
 725         public function setTitle( $t ) {
 726                 $this->mTitle = $t;
 727         }
 728
 729         /**
 730          * Get the Title object used in this instance
 731          *
 732          * @return Title
 733          */
 734         public function getTitle() {
 735                 if ( $this->mTitle instanceof Title ) {
 736                         return $this->mTitle;
 737                 } else {
 738                         wfDebug( __METHOD__ . " called and \$mTitle is null. Return \$wgTitle for sanity\n" );
 739                         global $wgTitle;
 740                         return $wgTitle;
 741                 }
 742         }
 743
 744         /**
 745          * Replace the subtile with $str
 746          *
 747          * @param $str String: new value of the subtitle
 748          */
 749         public function setSubtitle( $str ) {
 750                 $this->mSubtitle = /*$this->parse(*/ $str /*)*/; // @bug 2514
 751         }
 752
 753         /**
 754          * Add $str to the subtitle
 755          *
 756          * @param $str String to add to the subtitle
 757          */
 758         public function appendSubtitle( $str ) {
 759                 $this->mSubtitle .= /*$this->parse(*/ $str /*)*/; // @bug 2514
 760         }
 761
 762         /**
 763          * Get the subtitle
 764          *
 765          * @return String
 766          */
 767         public function getSubtitle() {
 768                 return $this->mSubtitle;
 769         }
 770
 771         /**
 772          * Set the page as printable, i.e. it'll be displayed with with all
 773          * print styles included
 774          */
 775         public function setPrintable() {
 776                 $this->mPrintable = true;
 777         }
 778
 779         /**
 780          * Return whether the page is "printable"
 781          *
 782          * @return Boolean
 783          */
 784         public function isPrintable() {
 785                 return $this->mPrintable;
 786         }
 787
 788         /**
 789          * Disable output completely, i.e. calling output() will have no effect
 790          */
 791         public function disable() {
 792                 $this->mDoNothing = true;
 793         }
 794
 795         /**
 796          * Return whether the output will be completely disabled
 797          *
 798          * @return Boolean
 799          */
 800         public function isDisabled() {
 801                 return $this->mDoNothing;
 802         }
 803
 804         /**
 805          * Show an "add new section" link?
 806          *
 807          * @return Boolean
 808          */
 809         public function showNewSectionLink() {
 810                 return $this->mNewSectionLink;
 811         }
 812
 813         /**
 814          * Forcibly hide the new section link?
 815          *
 816          * @return Boolean
 817          */
 818         public function forceHideNewSectionLink() {
 819                 return $this->mHideNewSectionLink;
 820         }
 821
 822         /**
 823          * Add or remove feed links in the page header
 824          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
 825          * for the new version
 826          * @see addFeedLink()
 827          *
 828          * @param $show Boolean: true: add default feeds, false: remove all feeds
 829          */
 830         public function setSyndicated( $show = true ) {
 831                 if ( $show ) {
 832                         $this->setFeedAppendQuery( false );
 833                 } else {
 834                         $this->mFeedLinks = array();
 835                 }
 836         }
 837
 838         /**
 839          * Add default feeds to the page header
 840          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
 841          * for the new version
 842          * @see addFeedLink()
 843          *
 844          * @param $val String: query to append to feed links or false to output
 845          *        default links
 846          */
 847         public function setFeedAppendQuery( $val ) {
 848                 global $wgAdvertisedFeedTypes;
 849
 850                 $this->mFeedLinks = array();
 851
 852                 foreach ( $wgAdvertisedFeedTypes as $type ) {
 853                         $query = "feed=$type";
 854                         if ( is_string( $val ) ) {
 855                                 $query .= '&' . $val;
 856                         }
 857                         $this->mFeedLinks[$type] = $this->getTitle()->getLocalURL( $query );
 858                 }
 859         }
 860
 861         /**
 862          * Add a feed link to the page header
 863          *
 864          * @param $format String: feed type, should be a key of $wgFeedClasses
 865          * @param $href String: URL
 866          */
 867         public function addFeedLink( $format, $href ) {
 868                 global $wgAdvertisedFeedTypes;
 869
 870                 if ( in_array( $format, $wgAdvertisedFeedTypes ) ) {
 871                         $this->mFeedLinks[$format] = $href;
 872                 }
 873         }
 874
 875         /**
 876          * Should we output feed links for this page?
 877          * @return Boolean
 878          */
 879         public function isSyndicated() {
 880                 return count( $this->mFeedLinks ) > 0;
 881         }
 882
 883         /**
 884          * Return URLs for each supported syndication format for this page.
 885          * @return array associating format keys with URLs
 886          */
 887         public function getSyndicationLinks() {
 888                 return $this->mFeedLinks;
 889         }
 890
 891         /**
 892          * Will currently always return null
 893          *
 894          * @return null
 895          */
 896         public function getFeedAppendQuery() {
 897                 return $this->mFeedLinksAppendQuery;
 898         }
 899
 900         /**
 901          * Set whether the displayed content is related to the source of the
 902          * corresponding article on the wiki
 903          * Setting true will cause the change "article related" toggle to true
 904          *
 905          * @param $v Boolean
 906          */
 907         public function setArticleFlag( $v ) {
 908                 $this->mIsarticle = $v;
 909                 if ( $v ) {
 910                         $this->mIsArticleRelated = $v;
 911                 }
 912         }
 913
 914         /**
 915          * Return whether the content displayed page is related to the source of
 916          * the corresponding article on the wiki
 917          *
 918          * @return Boolean
 919          */
 920         public function isArticle() {
 921                 return $this->mIsarticle;
 922         }
 923
 924         /**
 925          * Set whether this page is related an article on the wiki
 926          * Setting false will cause the change of "article flag" toggle to false
 927          *
 928          * @param $v Boolean
 929          */
 930         public function setArticleRelated( $v ) {
 931                 $this->mIsArticleRelated = $v;
 932                 if ( !$v ) {
 933                         $this->mIsarticle = false;
 934                 }
 935         }
 936
 937         /**
 938          * Return whether this page is related an article on the wiki
 939          *
 940          * @return Boolean
 941          */
 942         public function isArticleRelated() {
 943                 return $this->mIsArticleRelated;
 944         }
 945
 946         /**
 947          * Add new language links
 948          *
 949          * @param $newLinkArray Associative array mapping language code to the page
 950          *                      name
 951          */
 952         public function addLanguageLinks( $newLinkArray ) {
 953                 $this->mLanguageLinks += $newLinkArray;
 954         }
 955
 956         /**
 957          * Reset the language links and add new language links
 958          *
 959          * @param $newLinkArray Associative array mapping language code to the page
 960          *                      name
 961          */
 962         public function setLanguageLinks( $newLinkArray ) {
 963                 $this->mLanguageLinks = $newLinkArray;
 964         }
 965
 966         /**
 967          * Get the list of language links
 968          *
 969          * @return Associative array mapping language code to the page name
 970          */
 971         public function getLanguageLinks() {
 972                 return $this->mLanguageLinks;
 973         }
 974
 975         /**
 976          * Add an array of categories, with names in the keys
 977          *
 978          * @param $categories Associative array mapping category name to its sort key
 979          */
 980         public function addCategoryLinks( $categories ) {
 981                 global $wgUser, $wgContLang;
 982
 983                 if ( !is_array( $categories ) || count( $categories ) == 0 ) {
 984                         return;
 985                 }
 986
 987                 # Add the links to a LinkBatch
 988                 $arr = array( NS_CATEGORY => $categories );
 989                 $lb = new LinkBatch;
 990                 $lb->setArray( $arr );
 991
 992                 # Fetch existence plus the hiddencat property
 993                 $dbr = wfGetDB( DB_SLAVE );
 994                 $pageTable = $dbr->tableName( 'page' );
 995                 $where = $lb->constructSet( 'page', $dbr );
 996                 $propsTable = $dbr->tableName( 'page_props' );
 997                 $sql = "SELECT page_id, page_namespace, page_title, page_len, page_is_redirect, page_latest, pp_value
 998                         FROM $pageTable LEFT JOIN $propsTable ON pp_propname='hiddencat' AND pp_page=page_id WHERE $where";
 999                 $res = $dbr->query( $sql, __METHOD__ );
1000
1001                 # Add the results to the link cache
1002                 $lb->addResultToCache( LinkCache::singleton(), $res );
1003
1004                 # Set all the values to 'normal'. This can be done with array_fill_keys in PHP 5.2.0+
1005                 $categories = array_combine(
1006                         array_keys( $categories ),
1007                         array_fill( 0, count( $categories ), 'normal' )
1008                 );
1009
1010                 # Mark hidden categories
1011                 foreach ( $res as $row ) {
1012                         if ( isset( $row->pp_value ) ) {
1013                                 $categories[$row->page_title] = 'hidden';
1014                         }
1015                 }
1016
1017                 # Add the remaining categories to the skin
1018                 if ( wfRunHooks( 'OutputPageMakeCategoryLinks', array( &$this, $categories, &$this->mCategoryLinks ) ) ) {
1019                         $sk = $wgUser->getSkin();
1020                         foreach ( $categories as $category => $type ) {
1021                                 $origcategory = $category;
1022                                 $title = Title::makeTitleSafe( NS_CATEGORY, $category );
1023                                 $wgContLang->findVariantLink( $category, $title, true );
1024                                 if ( $category != $origcategory ) {
1025                                         if ( array_key_exists( $category, $categories ) ) {
1026                                                 continue;
1027                                         }
1028                                 }
1029                                 $text = $wgContLang->convertHtml( $title->getText() );
1030                                 $this->mCategories[] = $title->getText();
1031                                 $this->mCategoryLinks[$type][] = $sk->link( $title, $text );
1032                         }
1033                 }
1034         }
1035
1036         /**
1037          * Reset the category links (but not the category list) and add $categories
1038          *
1039          * @param $categories Associative array mapping category name to its sort key
1040          */
1041         public function setCategoryLinks( $categories ) {
1042                 $this->mCategoryLinks = array();
1043                 $this->addCategoryLinks( $categories );
1044         }
1045
1046         /**
1047          * Get the list of category links, in a 2-D array with the following format:
1048          * $arr[$type][] = $link, where $type is either "normal" or "hidden" (for
1049          * hidden categories) and $link a HTML fragment with a link to the category
1050          * page
1051          *
1052          * @return Array
1053          */
1054         public function getCategoryLinks() {
1055                 return $this->mCategoryLinks;
1056         }
1057
1058         /**
1059          * Get the list of category names this page belongs to
1060          *
1061          * @return Array of strings
1062          */
1063         public function getCategories() {
1064                 return $this->mCategories;
1065         }
1066
1067         /**
1068          * Suppress the quickbar from the output, only for skin supporting
1069          * the quickbar
1070          */
1071         public function suppressQuickbar() {
1072                 $this->mSuppressQuickbar = true;
1073         }
1074
1075         /**
1076          * Return whether the quickbar should be suppressed from the output
1077          *
1078          * @return Boolean
1079          */
1080         public function isQuickbarSuppressed() {
1081                 return $this->mSuppressQuickbar;
1082         }
1083
1084         /**
1085          * Remove user JavaScript from scripts to load
1086          */
1087         public function disallowUserJs() {
1088                 $this->mAllowUserJs = false;
1089         }
1090
1091         /**
1092          * Return whether user JavaScript is allowed for this page
1093          *
1094          * @return Boolean
1095          */
1096         public function isUserJsAllowed() {
1097                 return $this->mAllowUserJs;
1098         }
1099
1100         /**
1101          * Prepend $text to the body HTML
1102          *
1103          * @param $text String: HTML
1104          */
1105         public function prependHTML( $text ) {
1106                 $this->mBodytext = $text . $this->mBodytext;
1107         }
1108
1109         /**
1110          * Append $text to the body HTML
1111          *
1112          * @param $text String: HTML
1113          */
1114         public function addHTML( $text ) {
1115                 $this->mBodytext .= $text;
1116         }
1117
1118         /**
1119          * Clear the body HTML
1120          */
1121         public function clearHTML() {
1122                 $this->mBodytext = '';
1123         }
1124
1125         /**
1126          * Get the body HTML
1127          *
1128          * @return String: HTML
1129          */
1130         public function getHTML() {
1131                 return $this->mBodytext;
1132         }
1133
1134         /**
1135          * Add $text to the debug output
1136          *
1137          * @param $text String: debug text
1138          */
1139         public function debug( $text ) {
1140                 $this->mDebugtext .= $text;
1141         }
1142
1143         /**
1144          * Get/set the ParserOptions object to use for wikitext parsing
1145          *
1146          * @param $options either the ParserOption to use or null to only get the
1147          *                 current ParserOption object
1148          * @return current ParserOption object
1149          */
1150         public function parserOptions( $options = null ) {
1151                 if ( !$this->mParserOptions ) {
1152                         $this->mParserOptions = new ParserOptions;
1153                 }
1154                 return wfSetVar( $this->mParserOptions, $options );
1155         }
1156
1157         /**
1158          * Set the revision ID which will be seen by the wiki text parser
1159          * for things such as embedded {{REVISIONID}} variable use.
1160          *
1161          * @param $revid Mixed: an positive integer, or null
1162          * @return Mixed: previous value
1163          */
1164         public function setRevisionId( $revid ) {
1165                 $val = is_null( $revid ) ? null : intval( $revid );
1166                 return wfSetVar( $this->mRevisionId, $val );
1167         }
1168
1169         /**
1170          * Get the current revision ID
1171          *
1172          * @return Integer
1173          */
1174         public function getRevisionId() {
1175                 return $this->mRevisionId;
1176         }
1177
1178         /**
1179          * Convert wikitext to HTML and add it to the buffer
1180          * Default assumes that the current page title will be used.
1181          *
1182          * @param $text String
1183          * @param $linestart Boolean: is this the start of a line?
1184          */
1185         public function addWikiText( $text, $linestart = true ) {
1186                 $title = $this->getTitle(); // Work arround E_STRICT
1187                 $this->addWikiTextTitle( $text, $title, $linestart );
1188         }
1189
1190         /**
1191          * Add wikitext with a custom Title object
1192          *
1193          * @param $text String: wikitext
1194          * @param $title Title object
1195          * @param $linestart Boolean: is this the start of a line?
1196          */
1197         public function addWikiTextWithTitle( $text, &$title, $linestart = true ) {
1198                 $this->addWikiTextTitle( $text, $title, $linestart );
1199         }
1200
1201         /**
1202          * Add wikitext with a custom Title object and
1203          *
1204          * @param $text String: wikitext
1205          * @param $title Title object
1206          * @param $linestart Boolean: is this the start of a line?
1207          */
1208         function addWikiTextTitleTidy( $text, &$title, $linestart = true ) {
1209                 $this->addWikiTextTitle( $text, $title, $linestart, true );
1210         }
1211
1212         /**
1213          * Add wikitext with tidy enabled
1214          *
1215          * @param $text String: wikitext
1216          * @param $linestart Boolean: is this the start of a line?
1217          */
1218         public function addWikiTextTidy( $text, $linestart = true ) {
1219                 $title = $this->getTitle();
1220                 $this->addWikiTextTitleTidy( $text, $title, $linestart );
1221         }
1222
1223         /**
1224          * Add wikitext with a custom Title object
1225          *
1226          * @param $text String: wikitext
1227          * @param $title Title object
1228          * @param $linestart Boolean: is this the start of a line?
1229          * @param $tidy Boolean: whether to use tidy
1230          */
1231         public function addWikiTextTitle( $text, &$title, $linestart, $tidy = false ) {
1232                 global $wgParser;
1233
1234                 wfProfileIn( __METHOD__ );
1235
1236                 wfIncrStats( 'pcache_not_possible' );
1237
1238                 $popts = $this->parserOptions();
1239                 $oldTidy = $popts->setTidy( $tidy );
1240
1241                 $parserOutput = $wgParser->parse(
1242                         $text, $title, $popts,
1243                         $linestart, true, $this->mRevisionId
1244                 );
1245
1246                 $popts->setTidy( $oldTidy );
1247
1248                 $this->addParserOutput( $parserOutput );
1249
1250                 wfProfileOut( __METHOD__ );
1251         }
1252
1253         /**
1254          * Add a ParserOutput object, but without Html
1255          *
1256          * @param $parserOutput ParserOutput object
1257          */
1258         public function addParserOutputNoText( &$parserOutput ) {
1259                 $this->mLanguageLinks += $parserOutput->getLanguageLinks();
1260                 $this->addCategoryLinks( $parserOutput->getCategories() );
1261                 $this->mNewSectionLink = $parserOutput->getNewSection();
1262                 $this->mHideNewSectionLink = $parserOutput->getHideNewSection();
1263
1264                 $this->mParseWarnings = $parserOutput->getWarnings();
1265                 if ( !$parserOutput->isCacheable() ) {
1266                         $this->enableClientCache( false );
1267                 }
1268                 $this->mNoGallery = $parserOutput->getNoGallery();
1269                 $this->mHeadItems = array_merge( $this->mHeadItems, $parserOutput->getHeadItems() );
1270                 $this->addModules( $parserOutput->getModules() );
1271                 // Versioning...
1272                 foreach ( (array)$parserOutput->mTemplateIds as $ns => $dbks ) {
1273                         if ( isset( $this->mTemplateIds[$ns] ) ) {
1274                                 $this->mTemplateIds[$ns] = $dbks + $this->mTemplateIds[$ns];
1275                         } else {
1276                                 $this->mTemplateIds[$ns] = $dbks;
1277                         }
1278                 }
1279
1280                 // Hooks registered in the object
1281                 global $wgParserOutputHooks;
1282                 foreach ( $parserOutput->getOutputHooks() as $hookInfo ) {
1283                         list( $hookName, $data ) = $hookInfo;
1284                         if ( isset( $wgParserOutputHooks[$hookName] ) ) {
1285                                 call_user_func( $wgParserOutputHooks[$hookName], $this, $parserOutput, $data );
1286                         }
1287                 }
1288
1289                 wfRunHooks( 'OutputPageParserOutput', array( &$this, $parserOutput ) );
1290         }
1291
1292         /**
1293          * Add a ParserOutput object
1294          *
1295          * @param $parserOutput ParserOutput
1296          */
1297         function addParserOutput( &$parserOutput ) {
1298                 $this->addParserOutputNoText( $parserOutput );
1299                 $text = $parserOutput->getText();
1300                 wfRunHooks( 'OutputPageBeforeHTML', array( &$this, &$text ) );
1301                 $this->addHTML( $text );
1302         }
1303
1304
1305         /**
1306          * Add the output of a QuickTemplate to the output buffer
1307          *
1308          * @param $template QuickTemplate
1309          */
1310         public function addTemplate( &$template ) {
1311                 ob_start();
1312                 $template->execute();
1313                 $this->addHTML( ob_get_contents() );
1314                 ob_end_clean();
1315         }
1316
1317         /**
1318          * Parse wikitext and return the HTML.
1319          *
1320          * @param $text String
1321          * @param $linestart Boolean: is this the start of a line?
1322          * @param $interface Boolean: use interface language ($wgLang instead of
1323          *                   $wgContLang) while parsing language sensitive magic
1324          *                   words like GRAMMAR and PLURAL
1325          * @param $language  Language object: target language object, will override
1326          *                   $interface
1327          * @return String: HTML
1328          */
1329         public function parse( $text, $linestart = true, $interface = false, $language = null ) {
1330                 // Check one for one common cause for parser state resetting
1331                 $callers = wfGetAllCallers( 10 );
1332                 if ( strpos( $callers, 'Parser::extensionSubstitution' ) !== false ) {
1333                         throw new MWException( "wfMsg* function with parsing cannot be used " .
1334                                 "inside a tag hook. Should use parser->recursiveTagParse() instead" );
1335                 }
1336
1337                 global $wgParser;
1338
1339                 if( is_null( $this->getTitle() ) ) {
1340                         throw new MWException( 'Empty $mTitle in ' . __METHOD__ );
1341                 }
1342
1343                 $popts = $this->parserOptions();
1344                 if ( $interface ) {
1345                         $popts->setInterfaceMessage( true );
1346                 }
1347                 if ( $language !== null ) {
1348                         $oldLang = $popts->setTargetLanguage( $language );
1349                 }
1350
1351                 $parserOutput = $wgParser->parse(
1352                         $text, $this->getTitle(), $popts,
1353                         $linestart, true, $this->mRevisionId
1354                 );
1355
1356                 if ( $interface ) {
1357                         $popts->setInterfaceMessage( false );
1358                 }
1359                 if ( $language !== null ) {
1360                         $popts->setTargetLanguage( $oldLang );
1361                 }
1362
1363                 return $parserOutput->getText();
1364         }
1365
1366         /**
1367          * Parse wikitext, strip paragraphs, and return the HTML.
1368          *
1369          * @param $text String
1370          * @param $linestart Boolean: is this the start of a line?
1371          * @param $interface Boolean: use interface language ($wgLang instead of
1372          *                   $wgContLang) while parsing language sensitive magic
1373          *                   words like GRAMMAR and PLURAL
1374          * @return String: HTML
1375          */
1376         public function parseInline( $text, $linestart = true, $interface = false ) {
1377                 $parsed = $this->parse( $text, $linestart, $interface );
1378
1379                 $m = array();
1380                 if ( preg_match( '/^<p>(.*)\n?<\/p>\n?/sU', $parsed, $m ) ) {
1381                         $parsed = $m[1];
1382                 }
1383
1384                 return $parsed;
1385         }
1386
1387         /**
1388          * Set the value of the "s-maxage" part of the "Cache-control" HTTP header
1389          *
1390          * @param $maxage Integer: maximum cache time on the Squid, in seconds.
1391          */
1392         public function setSquidMaxage( $maxage ) {
1393                 $this->mSquidMaxage = $maxage;
1394         }
1395
1396         /**
1397          * Use enableClientCache(false) to force it to send nocache headers
1398          *
1399          * @param $state ??
1400          */
1401         public function enableClientCache( $state ) {
1402                 return wfSetVar( $this->mEnableClientCache, $state );
1403         }
1404
1405         /**
1406          * Get the list of cookies that will influence on the cache
1407          *
1408          * @return Array
1409          */
1410         function getCacheVaryCookies() {
1411                 global $wgCookiePrefix, $wgCacheVaryCookies;
1412                 static $cookies;
1413                 if ( $cookies === null ) {
1414                         $cookies = array_merge(
1415                                 array(
1416                                         "{$wgCookiePrefix}Token",
1417                                         "{$wgCookiePrefix}LoggedOut",
1418                                         session_name()
1419                                 ),
1420                                 $wgCacheVaryCookies
1421                         );
1422                         wfRunHooks( 'GetCacheVaryCookies', array( $this, &$cookies ) );
1423                 }
1424                 return $cookies;
1425         }
1426
1427         /**
1428          * Return whether this page is not cacheable because "useskin" or "uselang"
1429          * URL parameters were passed.
1430          *
1431          * @return Boolean
1432          */
1433         function uncacheableBecauseRequestVars() {
1434                 global $wgRequest;
1435                 return $wgRequest->getText( 'useskin', false ) === false
1436                         && $wgRequest->getText( 'uselang', false ) === false;
1437         }
1438
1439         /**
1440          * Check if the request has a cache-varying cookie header
1441          * If it does, it's very important that we don't allow public caching
1442          *
1443          * @return Boolean
1444          */
1445         function haveCacheVaryCookies() {
1446                 global $wgRequest;
1447                 $cookieHeader = $wgRequest->getHeader( 'cookie' );
1448                 if ( $cookieHeader === false ) {
1449                         return false;
1450                 }
1451                 $cvCookies = $this->getCacheVaryCookies();
1452                 foreach ( $cvCookies as $cookieName ) {
1453                         # Check for a simple string match, like the way squid does it
1454                         if ( strpos( $cookieHeader, $cookieName ) !== false ) {
1455                                 wfDebug( __METHOD__ . ": found $cookieName\n" );
1456                                 return true;
1457                         }
1458                 }
1459                 wfDebug( __METHOD__ . ": no cache-varying cookies found\n" );
1460                 return false;
1461         }
1462
1463         /**
1464          * Add an HTTP header that will influence on the cache
1465          *
1466          * @param $header String: header name
1467          * @param $option either an Array or null
1468          */
1469         public function addVaryHeader( $header, $option = null ) {
1470                 if ( !array_key_exists( $header, $this->mVaryHeader ) ) {
1471                         $this->mVaryHeader[$header] = $option;
1472                 } elseif( is_array( $option ) ) {
1473                         if( is_array( $this->mVaryHeader[$header] ) ) {
1474                                 $this->mVaryHeader[$header] = array_merge( $this->mVaryHeader[$header], $option );
1475                         } else {
1476                                 $this->mVaryHeader[$header] = $option;
1477                         }
1478                 }
1479                 $this->mVaryHeader[$header] = array_unique( $this->mVaryHeader[$header] );
1480         }
1481
1482         /**
1483          * Get a complete X-Vary-Options header
1484          *
1485          * @return String
1486          */
1487         public function getXVO() {
1488                 $cvCookies = $this->getCacheVaryCookies();
1489
1490                 $cookiesOption = array();
1491                 foreach ( $cvCookies as $cookieName ) {
1492                         $cookiesOption[] = 'string-contains=' . $cookieName;
1493                 }
1494                 $this->addVaryHeader( 'Cookie', $cookiesOption );
1495
1496                 $headers = array();
1497                 foreach( $this->mVaryHeader as $header => $option ) {
1498                         $newheader = $header;
1499                         if( is_array( $option ) ) {
1500                                 $newheader .= ';' . implode( ';', $option );
1501                         }
1502                         $headers[] = $newheader;
1503                 }
1504                 $xvo = 'X-Vary-Options: ' . implode( ',', $headers );
1505
1506                 return $xvo;
1507         }
1508
1509         /**
1510          * bug 21672: Add Accept-Language to Vary and XVO headers
1511          * if there's no 'variant' parameter existed in GET.
1512          *
1513          * For example:
1514          *   /w/index.php?title=Main_page should always be served; but
1515          *   /w/index.php?title=Main_page&variant=zh-cn should never be served.
1516          */
1517         function addAcceptLanguage() {
1518                 global $wgRequest, $wgContLang;
1519                 if( !$wgRequest->getCheck( 'variant' ) && $wgContLang->hasVariants() ) {
1520                         $variants = $wgContLang->getVariants();
1521                         $aloption = array();
1522                         foreach ( $variants as $variant ) {
1523                                 if( $variant === $wgContLang->getCode() ) {
1524                                         continue;
1525                                 } else {
1526                                         $aloption[] = 'string-contains=' . $variant;
1527
1528                                         // IE and some other browsers use another form of language code
1529                                         // in their Accept-Language header, like "zh-CN" or "zh-TW".
1530                                         // We should handle these too.
1531                                         $ievariant = explode( '-', $variant );
1532                                         if ( count( $ievariant ) == 2 ) {
1533                                                 $ievariant[1] = strtoupper( $ievariant[1] );
1534                                                 $ievariant = implode( '-', $ievariant );
1535                                                 $aloption[] = 'string-contains=' . $ievariant;
1536                                         }
1537                                 }
1538                         }
1539                         $this->addVaryHeader( 'Accept-Language', $aloption );
1540                 }
1541         }
1542
1543         /**
1544          * Set a flag which will cause an X-Frame-Options header appropriate for
1545          * edit pages to be sent. The header value is controlled by
1546          * $wgEditPageFrameOptions.
1547          *
1548          * This is the default for special pages. If you display a CSRF-protected
1549          * form on an ordinary view page, then you need to call this function.
1550          */
1551         public function preventClickjacking( $enable = true ) {
1552                 $this->mPreventClickjacking = $enable;
1553         }
1554
1555         /**
1556          * Turn off frame-breaking. Alias for $this->preventClickjacking(false).
1557          * This can be called from pages which do not contain any CSRF-protected
1558          * HTML form.
1559          */
1560         public function allowClickjacking() {
1561                 $this->mPreventClickjacking = false;
1562         }
1563
1564         /**
1565          * Get the X-Frame-Options header value (without the name part), or false
1566          * if there isn't one. This is used by Skin to determine whether to enable
1567          * JavaScript frame-breaking, for clients that don't support X-Frame-Options.
1568          */
1569         public function getFrameOptions() {
1570                 global $wgBreakFrames, $wgEditPageFrameOptions;
1571                 if ( $wgBreakFrames ) {
1572                         return 'DENY';
1573                 } elseif ( $this->mPreventClickjacking && $wgEditPageFrameOptions ) {
1574                         return $wgEditPageFrameOptions;
1575                 }
1576         }
1577
1578         /**
1579          * Send cache control HTTP headers
1580          */
1581         public function sendCacheControl() {
1582                 global $wgUseSquid, $wgUseESI, $wgUseETag, $wgSquidMaxage, $wgRequest, $wgUseXVO;
1583
1584                 $response = $wgRequest->response();
1585                 if ( $wgUseETag && $this->mETag ) {
1586                         $response->header( "ETag: $this->mETag" );
1587                 }
1588
1589                 $this->addAcceptLanguage();
1590
1591                 # don't serve compressed data to clients who can't handle it
1592                 # maintain different caches for logged-in users and non-logged in ones
1593                 $response->header( 'Vary: ' . join( ', ', array_keys( $this->mVaryHeader ) ) );
1594
1595                 if ( $wgUseXVO ) {
1596                         # Add an X-Vary-Options header for Squid with Wikimedia patches
1597                         $response->header( $this->getXVO() );
1598                 }
1599
1600                 if( !$this->uncacheableBecauseRequestVars() && $this->mEnableClientCache ) {
1601                         if(
1602                                 $wgUseSquid && session_id() == '' && !$this->isPrintable() &&
1603                                 $this->mSquidMaxage != 0 && !$this->haveCacheVaryCookies()
1604                         )
1605                         {
1606                                 if ( $wgUseESI ) {
1607                                         # We'll purge the proxy cache explicitly, but require end user agents
1608                                         # to revalidate against the proxy on each visit.
1609                                         # Surrogate-Control controls our Squid, Cache-Control downstream caches
1610                                         wfDebug( __METHOD__ . ": proxy caching with ESI; {$this->mLastModified} **\n", false );
1611                                         # start with a shorter timeout for initial testing
1612                                         # header( 'Surrogate-Control: max-age=2678400+2678400, content="ESI/1.0"');
1613                                         $response->header( 'Surrogate-Control: max-age='.$wgSquidMaxage.'+'.$this->mSquidMaxage.', content="ESI/1.0"');
1614                                         $response->header( 'Cache-Control: s-maxage=0, must-revalidate, max-age=0' );
1615                                 } else {
1616                                         # We'll purge the proxy cache for anons explicitly, but require end user agents
1617                                         # to revalidate against the proxy on each visit.
1618                                         # IMPORTANT! The Squid needs to replace the Cache-Control header with
1619                                         # Cache-Control: s-maxage=0, must-revalidate, max-age=0
1620                                         wfDebug( __METHOD__ . ": local proxy caching; {$this->mLastModified} **\n", false );
1621                                         # start with a shorter timeout for initial testing
1622                                         # header( "Cache-Control: s-maxage=2678400, must-revalidate, max-age=0" );
1623                                         $response->header( 'Cache-Control: s-maxage='.$this->mSquidMaxage.', must-revalidate, max-age=0' );
1624                                 }
1625                         } else {
1626                                 # We do want clients to cache if they can, but they *must* check for updates
1627                                 # on revisiting the page.
1628                                 wfDebug( __METHOD__ . ": private caching; {$this->mLastModified} **\n", false );
1629                                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1630                                 $response->header( "Cache-Control: private, must-revalidate, max-age=0" );
1631                         }
1632                         if($this->mLastModified) {
1633                                 $response->header( "Last-Modified: {$this->mLastModified}" );
1634                         }
1635                 } else {
1636                         wfDebug( __METHOD__ . ": no caching **\n", false );
1637
1638                         # In general, the absence of a last modified header should be enough to prevent
1639                         # the client from using its cache. We send a few other things just to make sure.
1640                         $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1641                         $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
1642                         $response->header( 'Pragma: no-cache' );
1643                 }
1644         }
1645
1646         /**
1647          * Get the message associed with the HTTP response code $code
1648          *
1649          * @param $code Integer: status code
1650          * @return String or null: message or null if $code is not in the list of
1651          *         messages
1652          */
1653         public static function getStatusMessage( $code ) {
1654                 static $statusMessage = array(
1655                         100 => 'Continue',
1656                         101 => 'Switching Protocols',
1657                         102 => 'Processing',
1658                         200 => 'OK',
1659                         201 => 'Created',
1660                         202 => 'Accepted',
1661                         203 => 'Non-Authoritative Information',
1662                         204 => 'No Content',
1663                         205 => 'Reset Content',
1664                         206 => 'Partial Content',
1665                         207 => 'Multi-Status',
1666                         300 => 'Multiple Choices',
1667                         301 => 'Moved Permanently',
1668                         302 => 'Found',
1669                         303 => 'See Other',
1670                         304 => 'Not Modified',
1671                         305 => 'Use Proxy',
1672                         307 => 'Temporary Redirect',
1673                         400 => 'Bad Request',
1674                         401 => 'Unauthorized',
1675                         402 => 'Payment Required',
1676                         403 => 'Forbidden',
1677                         404 => 'Not Found',
1678                         405 => 'Method Not Allowed',
1679                         406 => 'Not Acceptable',
1680                         407 => 'Proxy Authentication Required',
1681                         408 => 'Request Timeout',
1682                         409 => 'Conflict',
1683                         410 => 'Gone',
1684                         411 => 'Length Required',
1685                         412 => 'Precondition Failed',
1686                         413 => 'Request Entity Too Large',
1687                         414 => 'Request-URI Too Large',
1688                         415 => 'Unsupported Media Type',
1689                         416 => 'Request Range Not Satisfiable',
1690                         417 => 'Expectation Failed',
1691                         422 => 'Unprocessable Entity',
1692                         423 => 'Locked',
1693                         424 => 'Failed Dependency',
1694                         500 => 'Internal Server Error',
1695                         501 => 'Not Implemented',
1696                         502 => 'Bad Gateway',
1697                         503 => 'Service Unavailable',
1698                         504 => 'Gateway Timeout',
1699                         505 => 'HTTP Version Not Supported',
1700                         507 => 'Insufficient Storage'
1701                 );
1702                 return isset( $statusMessage[$code] ) ? $statusMessage[$code] : null;
1703         }
1704
1705         /**
1706          * Finally, all the text has been munged and accumulated into
1707          * the object, let's actually output it:
1708          */
1709         public function output() {
1710                 global $wgUser, $wgOutputEncoding, $wgRequest;
1711                 global $wgLanguageCode, $wgDebugRedirects, $wgMimeType;
1712                 global $wgUseAjax, $wgAjaxWatch;
1713                 global $wgEnableMWSuggest, $wgUniversalEditButton;
1714
1715                 if( $this->mDoNothing ) {
1716                         return;
1717                 }
1718                 wfProfileIn( __METHOD__ );
1719                 if ( $this->mRedirect != '' ) {
1720                         # Standards require redirect URLs to be absolute
1721                         $this->mRedirect = wfExpandUrl( $this->mRedirect );
1722                         if( $this->mRedirectCode == '301' || $this->mRedirectCode == '303' ) {
1723                                 if( !$wgDebugRedirects ) {
1724                                         $message = self::getStatusMessage( $this->mRedirectCode );
1725                                         $wgRequest->response()->header( "HTTP/1.1 {$this->mRedirectCode} $message" );
1726                                 }
1727                                 $this->mLastModified = wfTimestamp( TS_RFC2822 );
1728                         }
1729                         $this->sendCacheControl();
1730
1731                         $wgRequest->response()->header( "Content-Type: text/html; charset=utf-8" );
1732                         if( $wgDebugRedirects ) {
1733                                 $url = htmlspecialchars( $this->mRedirect );
1734                                 print "<html>\n<head>\n<title>Redirect</title>\n</head>\n<body>\n";
1735                                 print "<p>Location: <a href=\"$url\">$url</a></p>\n";
1736                                 print "</body>\n</html>\n";
1737                         } else {
1738                                 $wgRequest->response()->header( 'Location: ' . $this->mRedirect );
1739                         }
1740                         wfProfileOut( __METHOD__ );
1741                         return;
1742                 } elseif ( $this->mStatusCode ) {
1743                         $message = self::getStatusMessage( $this->mStatusCode );
1744                         if ( $message ) {
1745                                 $wgRequest->response()->header( 'HTTP/1.1 ' . $this->mStatusCode . ' ' . $message );
1746                         }
1747                 }
1748
1749                 $sk = $wgUser->getSkin();
1750
1751                 // Add base resources
1752                 $this->addModules( array( 'mediawiki.legacy.wikibits', 'mediawiki.util' ) );
1753
1754                 // Add various resources if required
1755                 if ( $wgUseAjax ) {
1756                         $this->addModules( 'mediawiki.legacy.ajax' );
1757
1758                         wfRunHooks( 'AjaxAddScript', array( &$this ) );
1759
1760                         if( $wgAjaxWatch && $wgUser->isLoggedIn() ) {
1761                                 $this->addModules( 'mediawiki.action.watch.ajax' );
1762                         }
1763
1764                         if ( $wgEnableMWSuggest && !$wgUser->getOption( 'disablesuggest', false ) ) {
1765                                 $this->addModules( 'mediawiki.legacy.mwsuggest' );
1766                         }
1767                 }
1768
1769                 if( $wgUser->getBoolOption( 'editsectiononrightclick' ) ) {
1770                         $this->addModules( 'mediawiki.action.view.rightClickEdit' );
1771                 }
1772
1773                 if( $wgUniversalEditButton ) {
1774                         if( $this->isArticleRelated() && $this->getTitle() && $this->getTitle()->quickUserCan( 'edit' )
1775                                 && ( $this->getTitle()->exists() || $this->getTitle()->quickUserCan( 'create' ) ) ) {
1776                                 // Original UniversalEditButton
1777                                 $msg = wfMsg( 'edit' );
1778                                 $this->addLink( array(
1779                                         'rel' => 'alternate',
1780                                         'type' => 'application/x-wiki',
1781                                         'title' => $msg,
1782                                         'href' => $this->getTitle()->getLocalURL( 'action=edit' )
1783                                 ) );
1784                                 // Alternate edit link
1785                                 $this->addLink( array(
1786                                         'rel' => 'edit',
1787                                         'title' => $msg,
1788                                         'href' => $this->getTitle()->getLocalURL( 'action=edit' )
1789                                 ) );
1790                         }
1791                 }
1792
1793
1794                 # Buffer output; final headers may depend on later processing
1795                 ob_start();
1796
1797                 $wgRequest->response()->header( "Content-type: $wgMimeType; charset={$wgOutputEncoding}" );
1798                 $wgRequest->response()->header( 'Content-language: ' . $wgLanguageCode );
1799
1800                 // Prevent framing, if requested
1801                 $frameOptions = $this->getFrameOptions();
1802                 if ( $frameOptions ) {
1803                         $wgRequest->response()->header( "X-Frame-Options: $frameOptions" );
1804                 }
1805
1806                 if ( $this->mArticleBodyOnly ) {
1807                         $this->out( $this->mBodytext );
1808                 } else {
1809                         // Hook that allows last minute changes to the output page, e.g.
1810                         // adding of CSS or Javascript by extensions.
1811                         wfRunHooks( 'BeforePageDisplay', array( &$this, &$sk ) );
1812
1813                         wfProfileIn( 'Output-skin' );
1814                         $sk->outputPage( $this );
1815                         wfProfileOut( 'Output-skin' );
1816                 }
1817
1818                 $this->sendCacheControl();
1819                 ob_end_flush();
1820                 wfProfileOut( __METHOD__ );
1821         }
1822
1823         /**
1824          * Actually output something with print(). Performs an iconv to the
1825          * output encoding, if needed.
1826          *
1827          * @param $ins String: the string to output
1828          */
1829         public function out( $ins ) {
1830                 global $wgInputEncoding, $wgOutputEncoding, $wgContLang;
1831                 if ( 0 == strcmp( $wgInputEncoding, $wgOutputEncoding ) ) {
1832                         $outs = $ins;
1833                 } else {
1834                         $outs = $wgContLang->iconv( $wgInputEncoding, $wgOutputEncoding, $ins );
1835                         if ( false === $outs ) {
1836                                 $outs = $ins;
1837                         }
1838                 }
1839                 print $outs;
1840         }
1841
1842         /**
1843          * Produce a "user is blocked" page.
1844          *
1845          * @param $return Boolean: whether to have a "return to $wgTitle" message or not.
1846          * @return nothing
1847          */
1848         function blockedPage( $return = true ) {
1849                 global $wgUser, $wgContLang, $wgLang;
1850
1851                 $this->setPageTitle( wfMsg( 'blockedtitle' ) );
1852                 $this->setRobotPolicy( 'noindex,nofollow' );
1853                 $this->setArticleRelated( false );
1854
1855                 $name = User::whoIs( $wgUser->blockedBy() );
1856                 $reason = $wgUser->blockedFor();
1857                 if( $reason == '' ) {
1858                         $reason = wfMsg( 'blockednoreason' );
1859                 }
1860                 $blockTimestamp = $wgLang->timeanddate(
1861                         wfTimestamp( TS_MW, $wgUser->mBlock->mTimestamp ), true
1862                 );
1863                 $ip = wfGetIP();
1864
1865                 $link = '[[' . $wgContLang->getNsText( NS_USER ) . ":{$name}|{$name}]]";
1866
1867                 $blockid = $wgUser->mBlock->mId;
1868
1869                 $blockExpiry = $wgUser->mBlock->mExpiry;
1870                 if ( $blockExpiry == 'infinity' ) {
1871                         // Entry in database (table ipblocks) is 'infinity' but 'ipboptions' uses 'infinite' or 'indefinite'
1872                         // Search for localization in 'ipboptions'
1873                         $scBlockExpiryOptions = wfMsg( 'ipboptions' );
1874                         foreach ( explode( ',', $scBlockExpiryOptions ) as $option ) {
1875                                 if ( strpos( $option, ':' ) === false ) {
1876                                         continue;
1877                                 }
1878                                 list( $show, $value ) = explode( ':', $option );
1879                                 if ( $value == 'infinite' || $value == 'indefinite' ) {
1880                                         $blockExpiry = $show;
1881                                         break;
1882                                 }
1883                         }
1884                 } else {
1885                         $blockExpiry = $wgLang->timeanddate(
1886                                 wfTimestamp( TS_MW, $blockExpiry ),
1887                                 true
1888                         );
1889                 }
1890
1891                 if ( $wgUser->mBlock->mAuto ) {
1892                         $msg = 'autoblockedtext';
1893                 } else {
1894                         $msg = 'blockedtext';
1895                 }
1896
1897                 /* $ip returns who *is* being blocked, $intended contains who was meant to be blocked.
1898                  * This could be a username, an IP range, or a single IP. */
1899                 $intended = $wgUser->mBlock->mAddress;
1900
1901                 $this->addWikiMsg(
1902                         $msg, $link, $reason, $ip, $name, $blockid, $blockExpiry,
1903                         $intended, $blockTimestamp
1904                 );
1905
1906                 # Don't auto-return to special pages
1907                 if( $return ) {
1908                         $return = $this->getTitle()->getNamespace() > -1 ? $this->getTitle() : null;
1909                         $this->returnToMain( null, $return );
1910                 }
1911         }
1912
1913         /**
1914          * Output a standard error page
1915          *
1916          * @param $title String: message key for page title
1917          * @param $msg String: message key for page text
1918          * @param $params Array: message parameters
1919          */
1920         public function showErrorPage( $title, $msg, $params = array() ) {
1921                 if ( $this->getTitle() ) {
1922                         $this->mDebugtext .= 'Original title: ' . $this->getTitle()->getPrefixedText() . "\n";
1923                 }
1924                 $this->setPageTitle( wfMsg( $title ) );
1925                 $this->setHTMLTitle( wfMsg( 'errorpagetitle' ) );
1926                 $this->setRobotPolicy( 'noindex,nofollow' );
1927                 $this->setArticleRelated( false );
1928                 $this->enableClientCache( false );
1929                 $this->mRedirect = '';
1930                 $this->mBodytext = '';
1931
1932                 $this->addWikiMsgArray( $msg, $params );
1933
1934                 $this->returnToMain();
1935         }
1936
1937         /**
1938          * Output a standard permission error page
1939          *
1940          * @param $errors Array: error message keys
1941          * @param $action String: action that was denied or null if unknown
1942          */
1943         public function showPermissionsErrorPage( $errors, $action = null ) {
1944                 $this->mDebugtext .= 'Original title: ' .
1945                 $this->getTitle()->getPrefixedText() . "\n";
1946                 $this->setPageTitle( wfMsg( 'permissionserrors' ) );
1947                 $this->setHTMLTitle( wfMsg( 'permissionserrors' ) );
1948                 $this->setRobotPolicy( 'noindex,nofollow' );
1949                 $this->setArticleRelated( false );
1950                 $this->enableClientCache( false );
1951                 $this->mRedirect = '';
1952                 $this->mBodytext = '';
1953                 $this->addWikiText( $this->formatPermissionsErrorMessage( $errors, $action ) );
1954         }
1955
1956         /**
1957          * Display an error page indicating that a given version of MediaWiki is
1958          * required to use it
1959          *
1960          * @param $version Mixed: the version of MediaWiki needed to use the page
1961          */
1962         public function versionRequired( $version ) {
1963                 $this->setPageTitle( wfMsg( 'versionrequired', $version ) );
1964                 $this->setHTMLTitle( wfMsg( 'versionrequired', $version ) );
1965                 $this->setRobotPolicy( 'noindex,nofollow' );
1966                 $this->setArticleRelated( false );
1967                 $this->mBodytext = '';
1968
1969                 $this->addWikiMsg( 'versionrequiredtext', $version );
1970                 $this->returnToMain();
1971         }
1972
1973         /**
1974          * Display an error page noting that a given permission bit is required.
1975          *
1976          * @param $permission String: key required
1977          */
1978         public function permissionRequired( $permission ) {
1979                 global $wgLang;
1980
1981                 $this->setPageTitle( wfMsg( 'badaccess' ) );
1982                 $this->setHTMLTitle( wfMsg( 'errorpagetitle' ) );
1983                 $this->setRobotPolicy( 'noindex,nofollow' );
1984                 $this->setArticleRelated( false );
1985                 $this->mBodytext = '';
1986
1987                 $groups = array_map( array( 'User', 'makeGroupLinkWiki' ),
1988                         User::getGroupsWithPermission( $permission ) );
1989                 if( $groups ) {
1990                         $this->addWikiMsg(
1991                                 'badaccess-groups',
1992                                 $wgLang->commaList( $groups ),
1993                                 count( $groups )
1994                         );
1995                 } else {
1996                         $this->addWikiMsg( 'badaccess-group0' );
1997                 }
1998                 $this->returnToMain();
1999         }
2000
2001         /**
2002          * Produce the stock "please login to use the wiki" page
2003          */
2004         public function loginToUse() {
2005                 global $wgUser;
2006
2007                 if( $wgUser->isLoggedIn() ) {
2008                         $this->permissionRequired( 'read' );
2009                         return;
2010                 }
2011
2012                 $skin = $wgUser->getSkin();
2013
2014                 $this->setPageTitle( wfMsg( 'loginreqtitle' ) );
2015                 $this->setHtmlTitle( wfMsg( 'errorpagetitle' ) );
2016                 $this->setRobotPolicy( 'noindex,nofollow' );
2017                 $this->setArticleRelated( false );
2018
2019                 $loginTitle = SpecialPage::getTitleFor( 'Userlogin' );
2020                 $loginLink = $skin->link(
2021                         $loginTitle,
2022                         wfMsgHtml( 'loginreqlink' ),
2023                         array(),
2024                         array( 'returnto' => $this->getTitle()->getPrefixedText() ),
2025                         array( 'known', 'noclasses' )
2026                 );
2027                 $this->addHTML( wfMsgWikiHtml( 'loginreqpagetext', $loginLink ) );
2028                 $this->addHTML( "\n<!--" . $this->getTitle()->getPrefixedUrl() . '-->' );
2029
2030                 # Don't return to the main page if the user can't read it
2031                 # otherwise we'll end up in a pointless loop
2032                 $mainPage = Title::newMainPage();
2033                 if( $mainPage->userCanRead() ) {
2034                         $this->returnToMain( null, $mainPage );
2035                 }
2036         }
2037
2038         /**
2039          * Format a list of error messages
2040          *
2041          * @param $errors An array of arrays returned by Title::getUserPermissionsErrors
2042          * @param $action String: action that was denied or null if unknown
2043          * @return String: the wikitext error-messages, formatted into a list.
2044          */
2045         public function formatPermissionsErrorMessage( $errors, $action = null ) {
2046                 if ( $action == null ) {
2047                         $text = wfMsgNoTrans( 'permissionserrorstext', count( $errors ) ) . "\n\n";
2048                 } else {
2049                         $action_desc = wfMsgNoTrans( "action-$action" );
2050                         $text = wfMsgNoTrans(
2051                                 'permissionserrorstext-withaction',
2052                                 count( $errors ),
2053                                 $action_desc
2054                         ) . "\n\n";
2055                 }
2056
2057                 if ( count( $errors ) > 1 ) {
2058                         $text .= '<ul class="permissions-errors">' . "\n";
2059
2060                         foreach( $errors as $error ) {
2061                                 $text .= '<li>';
2062                                 $text .= call_user_func_array( 'wfMsgNoTrans', $error );
2063                                 $text .= "</li>\n";
2064                         }
2065                         $text .= '</ul>';
2066                 } else {
2067                         $text .= "<div class=\"permissions-errors\">\n" .
2068                                         call_user_func_array( 'wfMsgNoTrans', reset( $errors ) ) .
2069                                         "\n</div>";
2070                 }
2071
2072                 return $text;
2073         }
2074
2075         /**
2076          * Display a page stating that the Wiki is in read-only mode,
2077          * and optionally show the source of the page that the user
2078          * was trying to edit.  Should only be called (for this
2079          * purpose) after wfReadOnly() has returned true.
2080          *
2081          * For historical reasons, this function is _also_ used to
2082          * show the error message when a user tries to edit a page
2083          * they are not allowed to edit.  (Unless it's because they're
2084          * blocked, then we show blockedPage() instead.)  In this
2085          * case, the second parameter should be set to true and a list
2086          * of reasons supplied as the third parameter.
2087          *
2088          * @todo Needs to be split into multiple functions.
2089          *
2090          * @param $source    String: source code to show (or null).
2091          * @param $protected Boolean: is this a permissions error?
2092          * @param $reasons   Array: list of reasons for this error, as returned by Title::getUserPermissionsErrors().
2093          * @param $action    String: action that was denied or null if unknown
2094          */
2095         public function readOnlyPage( $source = null, $protected = false, $reasons = array(), $action = null ) {
2096                 global $wgUser;
2097                 $skin = $wgUser->getSkin();
2098
2099                 $this->setRobotPolicy( 'noindex,nofollow' );
2100                 $this->setArticleRelated( false );
2101
2102                 // If no reason is given, just supply a default "I can't let you do
2103                 // that, Dave" message.  Should only occur if called by legacy code.
2104                 if ( $protected && empty( $reasons ) ) {
2105                         $reasons[] = array( 'badaccess-group0' );
2106                 }
2107
2108                 if ( !empty( $reasons ) ) {
2109                         // Permissions error
2110                         if( $source ) {
2111                                 $this->setPageTitle( wfMsg( 'viewsource' ) );
2112                                 $this->setSubtitle(
2113                                         wfMsg( 'viewsourcefor', $skin->linkKnown( $this->getTitle() ) )
2114                                 );
2115                         } else {
2116                                 $this->setPageTitle( wfMsg( 'badaccess' ) );
2117                         }
2118                         $this->addWikiText( $this->formatPermissionsErrorMessage( $reasons, $action ) );
2119                 } else {
2120                         // Wiki is read only
2121                         $this->setPageTitle( wfMsg( 'readonly' ) );
2122                         $reason = wfReadOnlyReason();
2123                         $this->wrapWikiMsg( "<div class='mw-readonly-error'>\n$1\n</div>", array( 'readonlytext', $reason ) );
2124                 }
2125
2126                 // Show source, if supplied
2127                 if( is_string( $source ) ) {
2128                         $this->addWikiMsg( 'viewsourcetext' );
2129
2130                         $params = array(
2131                                 'id'   => 'wpTextbox1',
2132                                 'name' => 'wpTextbox1',
2133                                 'cols' => $wgUser->getOption( 'cols' ),
2134                                 'rows' => $wgUser->getOption( 'rows' ),
2135                                 'readonly' => 'readonly'
2136                         );
2137                         $this->addHTML( Html::element( 'textarea', $params, $source ) );
2138
2139                         // Show templates used by this article
2140                         $skin = $wgUser->getSkin();
2141                         $article = new Article( $this->getTitle() );
2142                         $this->addHTML( "<div class='templatesUsed'>
2143 {$skin->formatTemplates( $article->getUsedTemplates() )}
2144 </div>
2145 " );
2146                 }
2147
2148                 # If the title doesn't exist, it's fairly pointless to print a return
2149                 # link to it.  After all, you just tried editing it and couldn't, so
2150                 # what's there to do there?
2151                 if( $this->getTitle()->exists() ) {
2152                         $this->returnToMain( null, $this->getTitle() );
2153                 }
2154         }
2155
2156         /**
2157          * Adds JS-based password security checker
2158          * @param $passwordId String ID of input box containing password
2159          * @param $retypeId String ID of input box containing retyped password
2160          * @return none
2161          */
2162         public function addPasswordSecurity( $passwordId, $retypeId ) {
2163                 $data = array(
2164                         'password' => '#' . $passwordId,
2165                         'retype' => '#' . $retypeId,
2166                         'messages' => array(),
2167                 );
2168                 foreach ( array( 'password-strength', 'password-strength-bad', 'password-strength-mediocre',
2169                                 'password-strength-acceptable', 'password-strength-good', 'password-retype', 'password-retype-mismatch'
2170                         ) as $message ) {
2171                         $data['messages'][$message] = wfMsg( $message );
2172                 }
2173                 $this->addScript( Html::inlineScript( 'var passwordSecurity=' . FormatJson::encode( $data ) ) );
2174                 $this->addModules( 'mediawiki.legacy.password' );
2175         }
2176
2177         public function showFatalError( $message ) {
2178                 $this->setPageTitle( wfMsg( 'internalerror' ) );
2179                 $this->setRobotPolicy( 'noindex,nofollow' );
2180                 $this->setArticleRelated( false );
2181                 $this->enableClientCache( false );
2182                 $this->mRedirect = '';
2183                 $this->mBodytext = $message;
2184         }
2185
2186         public function showUnexpectedValueError( $name, $val ) {
2187                 $this->showFatalError( wfMsg( 'unexpected', $name, $val ) );
2188         }
2189
2190         public function showFileCopyError( $old, $new ) {
2191                 $this->showFatalError( wfMsg( 'filecopyerror', $old, $new ) );
2192         }
2193
2194         public function showFileRenameError( $old, $new ) {
2195                 $this->showFatalError( wfMsg( 'filerenameerror', $old, $new ) );
2196         }
2197
2198         public function showFileDeleteError( $name ) {
2199                 $this->showFatalError( wfMsg( 'filedeleteerror', $name ) );
2200         }
2201
2202         public function showFileNotFoundError( $name ) {
2203                 $this->showFatalError( wfMsg( 'filenotfound', $name ) );
2204         }
2205
2206         /**
2207          * Add a "return to" link pointing to a specified title
2208          *
2209          * @param $title Title to link
2210          * @param $query String: query string
2211          * @param $text String text of the link (input is not escaped)
2212          */
2213         public function addReturnTo( $title, $query = array(), $text = null ) {
2214                 global $wgUser;
2215                 $this->addLink( array( 'rel' => 'next', 'href' => $title->getFullURL() ) );
2216                 $link = wfMsgHtml(
2217                         'returnto',
2218                         $wgUser->getSkin()->link( $title, $text, array(), $query )
2219                 );
2220                 $this->addHTML( "<p id=\"mw-returnto\">{$link}</p>\n" );
2221         }
2222
2223         /**
2224          * Add a "return to" link pointing to a specified title,
2225          * or the title indicated in the request, or else the main page
2226          *
2227          * @param $unused No longer used
2228          * @param $returnto Title or String to return to
2229          * @param $returntoquery String: query string for the return to link
2230          */
2231         public function returnToMain( $unused = null, $returnto = null, $returntoquery = null ) {
2232                 global $wgRequest;
2233
2234                 if ( $returnto == null ) {
2235                         $returnto = $wgRequest->getText( 'returnto' );
2236                 }
2237
2238                 if ( $returntoquery == null ) {
2239                         $returntoquery = $wgRequest->getText( 'returntoquery' );
2240                 }
2241
2242                 if ( $returnto === '' ) {
2243                         $returnto = Title::newMainPage();
2244                 }
2245
2246                 if ( is_object( $returnto ) ) {
2247                         $titleObj = $returnto;
2248                 } else {
2249                         $titleObj = Title::newFromText( $returnto );
2250                 }
2251                 if ( !is_object( $titleObj ) ) {
2252                         $titleObj = Title::newMainPage();
2253                 }
2254
2255                 $this->addReturnTo( $titleObj, $returntoquery );
2256         }
2257
2258         /**
2259          * @param $sk Skin The given Skin
2260          * @param $includeStyle Boolean: unused
2261          * @return String: The doctype, opening <html>, and head element.
2262          */
2263         public function headElement( Skin $sk, $includeStyle = true ) {
2264                 global $wgOutputEncoding, $wgMimeType;
2265                 global $wgUseTrackbacks, $wgHtml5;
2266                 global $wgUser, $wgRequest, $wgLang;
2267
2268                 if ( $sk->commonPrintStylesheet() ) {
2269                         $this->addModuleStyles( 'mediawiki.legacy.wikiprintable' );
2270                 }
2271                 $sk->setupUserCss( $this );
2272
2273                 $ret = Html::htmlHeader( array( 'lang' => wfUILang()->getCode() ) );
2274
2275                 if ( $this->getHTMLTitle() == '' ) {
2276                         $this->setHTMLTitle( wfMsg( 'pagetitle', $this->getPageTitle() ) );
2277                 }
2278
2279                 $openHead = Html::openElement( 'head' );
2280                 if ( $openHead ) {
2281                         # Don't bother with the newline if $head == ''
2282                         $ret .= "$openHead\n";
2283                 }
2284
2285                 if ( $wgHtml5 ) {
2286                         # More succinct than <meta http-equiv=Content-Type>, has the
2287                         # same effect
2288                         $ret .= Html::element( 'meta', array( 'charset' => $wgOutputEncoding ) ) . "\n";
2289                 } else {
2290                         $this->addMeta( 'http:Content-Type', "$wgMimeType; charset=$wgOutputEncoding" );
2291                 }
2292
2293                 $ret .= Html::element( 'title', null, $this->getHTMLTitle() ) . "\n";
2294
2295                 $ret .= implode( "\n", array(
2296                         $this->getHeadLinks( $sk ),
2297                         $this->buildCssLinks( $sk ),
2298                         $this->getHeadItems()
2299                 ) );
2300
2301                 if ( $wgUseTrackbacks && $this->isArticleRelated() ) {
2302                         $ret .= $this->getTitle()->trackbackRDF();
2303                 }
2304
2305                 $closeHead = Html::closeElement( 'head' );
2306                 if ( $closeHead ) {
2307                         $ret .= "$closeHead\n";
2308                 }
2309
2310                 $bodyAttrs = array();
2311
2312                 # Crazy edit-on-double-click stuff
2313                 $action = $wgRequest->getVal( 'action', 'view' );
2314
2315                 if (
2316                         $this->getTitle()->getNamespace() != NS_SPECIAL &&
2317                         !in_array( $action, array( 'edit', 'submit' ) ) &&
2318                         $wgUser->getOption( 'editondblclick' )
2319                 )
2320                 {
2321                         $bodyAttrs['ondblclick'] = "document.location = '" . Xml::escapeJsString( $this->getTitle()->getEditURL() ) . "'";
2322                 }
2323
2324                 # Class bloat
2325                 $dir = wfUILang()->getDir();
2326                 $bodyAttrs['class'] = "mediawiki $dir";
2327
2328                 if ( $wgLang->capitalizeAllNouns() ) {
2329                         # A <body> class is probably not the best way to do this . . .
2330                         $bodyAttrs['class'] .= ' capitalize-all-nouns';
2331                 }
2332                 $bodyAttrs['class'] .= ' ns-' . $this->getTitle()->getNamespace();
2333                 if ( $this->getTitle()->getNamespace() == NS_SPECIAL ) {
2334                         $bodyAttrs['class'] .= ' ns-special';
2335                 } elseif ( $this->getTitle()->isTalkPage() ) {
2336                         $bodyAttrs['class'] .= ' ns-talk';
2337                 } else {
2338                         $bodyAttrs['class'] .= ' ns-subject';
2339                 }
2340                 $bodyAttrs['class'] .= ' ' . Sanitizer::escapeClass( 'page-' . $this->getTitle()->getPrefixedText() );
2341                 $bodyAttrs['class'] .= ' skin-' . Sanitizer::escapeClass( $wgUser->getSkin()->getSkinName() );
2342
2343                 $sk->addToBodyAttributes( $this, $bodyAttrs ); // Allow skins to add body attributes they need
2344                 wfRunHooks( 'OutputPageBodyAttributes', array( $this, $sk, &$bodyAttrs ) );
2345
2346                 $ret .= Html::openElement( 'body', $bodyAttrs ) . "\n";
2347
2348                 return $ret;
2349         }
2350
2351         /**
2352          * Get a ResourceLoader object associated with this OutputPage
2353          */
2354         public function getResourceLoader() {
2355                 if ( is_null( $this->mResourceLoader ) ) {
2356                         $this->mResourceLoader = new ResourceLoader();
2357                 }
2358                 return $this->mResourceLoader;
2359         }
2360
2361         /**
2362          * TODO: Document
2363          * @param $skin Skin
2364          * @param $modules Array/string with the module name
2365          * @param $only string May be styles, messages or scripts
2366          * @param $useESI boolean
2367          * @return string html <script> and <style> tags
2368          */
2369         protected function makeResourceLoaderLink( Skin $skin, $modules, $only, $useESI = false ) {
2370                 global $wgUser, $wgLang, $wgLoadScript, $wgResourceLoaderUseESI,
2371                         $wgResourceLoaderInlinePrivateModules, $wgRequest;
2372                 // Lazy-load ResourceLoader
2373                 // TODO: Should this be a static function of ResourceLoader instead?
2374                 // TODO: Divide off modules starting with "user", and add the user parameter to them
2375                 $query = array(
2376                         'lang' => $wgLang->getCode(),
2377                         'debug' => ResourceLoader::inDebugMode() ? 'true' : 'false',
2378                         'skin' => $skin->getSkinName(),
2379                         'only' => $only,
2380                 );
2381                 // Propagate printable and handheld parameters if present
2382                 if ( $wgRequest->getBool( 'printable' ) ) {
2383                         $query['printable'] = 1;
2384                 }
2385                 if ( $wgRequest->getBool( 'handheld' ) ) {
2386                         $query['handheld'] = 1;
2387                 }
2388
2389                 if ( !count( $modules ) ) {
2390                         return '';
2391                 }
2392
2393                 if ( count( $modules ) > 1 ) {
2394                         // Remove duplicate module requests
2395                         $modules = array_unique( (array) $modules );
2396                         // Sort module names so requests are more uniform
2397                         sort( $modules );
2398
2399                         if ( ResourceLoader::inDebugMode() ) {
2400                                 // Recursively call us for every item
2401                                 $links = '';
2402                                 foreach ( $modules as $name ) {
2403                                         $links .= $this->makeResourceLoaderLink( $skin, $name, $only, $useESI );
2404                                 }
2405                                 return $links;
2406                         }
2407                 }
2408
2409                 // Create keyed-by-group list of module objects from modules list
2410                 $groups = array();
2411                 $resourceLoader = $this->getResourceLoader();
2412                 foreach ( (array) $modules as $name ) {
2413                         $module = $resourceLoader->getModule( $name );
2414                         $group = $module->getGroup();
2415                         if ( !isset( $groups[$group] ) ) {
2416                                 $groups[$group] = array();
2417                         }
2418                         $groups[$group][$name] = $module;
2419                 }
2420                 $links = '';
2421                 foreach ( $groups as $group => $modules ) {
2422                         $query['modules'] = implode( '|', array_keys( $modules ) );
2423                         // Special handling for user-specific groups
2424                         if ( ( $group === 'user' || $group === 'private' ) && $wgUser->isLoggedIn() ) {
2425                                 $query['user'] = $wgUser->getName();
2426                         }
2427                         // Support inlining of private modules if configured as such
2428                         if ( $group === 'private' && $wgResourceLoaderInlinePrivateModules ) {
2429                                 $context = new ResourceLoaderContext( $resourceLoader, new FauxRequest( $query ) );
2430                                 if ( $only == 'styles' ) {
2431                                         $links .= Html::inlineStyle(
2432                                                 $resourceLoader->makeModuleResponse( $context, $modules )
2433                                         );
2434                                 } else {
2435                                         $links .= Html::inlineScript(
2436                                                 ResourceLoader::makeLoaderConditionalScript(
2437                                                         $resourceLoader->makeModuleResponse( $context, $modules )
2438                                                 )
2439                                         );
2440                                 }
2441                                 continue;
2442                         }
2443                         // Special handling for user and site groups; because users might change their stuff
2444                         // on-wiki like site or user pages, or user preferences; we need to find the highest
2445                         // timestamp of these user-changable modules so we can ensure cache misses on change
2446                         if ( $group === 'user' || $group === 'site' ) {
2447                                 // Create a fake request based on the one we are about to make so modules return
2448                                 // correct times
2449                                 $context = new ResourceLoaderContext( $resourceLoader, new FauxRequest( $query ) );
2450                                 // Get the maximum timestamp
2451                                 $timestamp = 1;
2452                                 foreach ( $modules as $module ) {
2453                                         $timestamp = max( $timestamp, $module->getModifiedTime( $context ) );
2454                                 }
2455                                 // Add a version parameter so cache will break when things change
2456                                 $query['version'] = wfTimestamp( TS_ISO_8601_BASIC, round( $timestamp, -2 ) );
2457                         }
2458                         // Make queries uniform in order
2459                         ksort( $query );
2460
2461                         $url = wfAppendQuery( $wgLoadScript, $query );
2462                         if ( $useESI && $wgResourceLoaderUseESI ) {
2463                                 $esi = Xml::element( 'esi:include', array( 'src' => $url ) );
2464                                 if ( $only == 'styles' ) {
2465                                         $links .= Html::inlineStyle( $esi );
2466                                 } else {
2467                                         $links .= Html::inlineScript( $esi );
2468                                 }
2469                         } else {
2470                                 // Automatically select style/script elements
2471                                 if ( $only === 'styles' ) {
2472                                         $links .= Html::linkedStyle( wfAppendQuery( $wgLoadScript, $query ) ) . "\n";
2473                                 } else {
2474                                         $links .= Html::linkedScript( wfAppendQuery( $wgLoadScript, $query ) ) . "\n";
2475                                 }
2476                         }
2477                 }
2478                 return $links;
2479         }
2480
2481         /**
2482          * Gets the global variables and mScripts; also adds userjs to the end if
2483          * enabled. Despite the name, these scripts are no longer put in the
2484          * <head> but at the bottom of the <body>
2485          *
2486          * @param $sk Skin object to use
2487          * @return String: HTML fragment
2488          */
2489         function getHeadScripts( Skin $sk ) {
2490                 global $wgUser, $wgRequest, $wgUseSiteJs;
2491
2492                 // Startup - this will immediately load jquery and mediawiki modules
2493                 $scripts = $this->makeResourceLoaderLink( $sk, 'startup', 'scripts', true );
2494
2495                 // Configuration -- This could be merged together with the load and go, but
2496                 // makeGlobalVariablesScript returns a whole script tag -- grumble grumble...
2497                 $scripts .= Skin::makeGlobalVariablesScript( $sk->getSkinName() ) . "\n";
2498
2499                 // Script and Messages "only" requests
2500                 $scripts .= $this->makeResourceLoaderLink( $sk, $this->getModuleScripts(), 'scripts' );
2501                 $scripts .= $this->makeResourceLoaderLink( $sk, $this->getModuleMessages(), 'messages' );
2502
2503                 // Modules requests - let the client calculate dependencies and batch requests as it likes
2504                 if ( $this->getModules() ) {
2505                         $scripts .= Html::inlineScript(
2506                                 ResourceLoader::makeLoaderConditionalScript(
2507                                         Xml::encodeJsCall( 'mediaWiki.loader.load', array( $this->getModules() ) ) .
2508                                         Xml::encodeJsCall( 'mediaWiki.loader.go', array() )
2509                                 )
2510                         ) . "\n";
2511                 }
2512
2513                 // Legacy Scripts
2514                 $scripts .= "\n" . $this->mScripts;
2515
2516                 // Add site JS if enabled
2517                 if ( $wgUseSiteJs ) {
2518                         $scripts .= $this->makeResourceLoaderLink( $sk, 'site', 'scripts' );
2519                 }
2520
2521                 // Add user JS if enabled - trying to load user.options as a bundle if possible
2522                 $userOptionsAdded = false;
2523                 if ( $this->isUserJsAllowed() && $wgUser->isLoggedIn() ) {
2524                         $action = $wgRequest->getVal( 'action', 'view' );
2525                         if( $this->mTitle && $this->mTitle->isJsSubpage() && $sk->userCanPreview( $action ) ) {
2526                                 # XXX: additional security check/prompt?
2527                                 $scripts .= Html::inlineScript( "\n" . $wgRequest->getText( 'wpTextbox1' ) . "\n" ) . "\n";
2528                         } else {
2529                                 $scripts .= $this->makeResourceLoaderLink(
2530                                         $sk, array( 'user', 'user.options' ), 'scripts'
2531                                 );
2532                                 $userOptionsAdded = true;
2533                         }
2534                 }
2535                 if ( !$userOptionsAdded ) {
2536                         $scripts .= $this->makeResourceLoaderLink( $sk, 'user.options', 'scripts' );
2537                 }
2538
2539                 return $scripts;
2540         }
2541
2542         /**
2543          * Add default \<meta\> tags
2544          */
2545         protected function addDefaultMeta() {
2546                 global $wgVersion, $wgHtml5;
2547
2548                 static $called = false;
2549                 if ( $called ) {
2550                         # Don't run this twice
2551                         return;
2552                 }
2553                 $called = true;
2554
2555                 if ( !$wgHtml5 ) {
2556                         $this->addMeta( 'http:Content-Style-Type', 'text/css' ); // bug 15835
2557                 }
2558                 $this->addMeta( 'generator', "MediaWiki $wgVersion" );
2559
2560                 $p = "{$this->mIndexPolicy},{$this->mFollowPolicy}";
2561                 if( $p !== 'index,follow' ) {
2562                         // http://www.robotstxt.org/wc/meta-user.html
2563                         // Only show if it's different from the default robots policy
2564                         $this->addMeta( 'robots', $p );
2565                 }
2566
2567                 if ( count( $this->mKeywords ) > 0 ) {
2568                         $strip = array(
2569                                 "/<.*?" . ">/" => '',
2570                                 "/_/" => ' '
2571                         );
2572                         $this->addMeta(
2573                                 'keywords',
2574                                 preg_replace(
2575                                         array_keys( $strip ),
2576                                         array_values( $strip ),
2577                                         implode( ',', $this->mKeywords )
2578                                 )
2579                         );
2580                 }
2581         }
2582
2583         /**
2584          * @return string HTML tag links to be put in the header.
2585          */
2586         public function getHeadLinks( Skin $sk ) {
2587                 global $wgFeed;
2588
2589                 // Ideally this should happen earlier, somewhere. :P
2590                 $this->addDefaultMeta();
2591
2592                 $tags = array();
2593
2594                 foreach ( $this->mMetatags as $tag ) {
2595                         if ( 0 == strcasecmp( 'http:', substr( $tag[0], 0, 5 ) ) ) {
2596                                 $a = 'http-equiv';
2597                                 $tag[0] = substr( $tag[0], 5 );
2598                         } else {
2599                                 $a = 'name';
2600                         }
2601                         $tags[] = Html::element( 'meta',
2602                                 array(
2603                                         $a => $tag[0],
2604                                         'content' => $tag[1]
2605                                 )
2606                         );
2607                 }
2608                 foreach ( $this->mLinktags as $tag ) {
2609                         $tags[] = Html::element( 'link', $tag );
2610                 }
2611
2612                 if( $wgFeed ) {
2613                         foreach( $this->getSyndicationLinks() as $format => $link ) {
2614                                 # Use the page name for the title (accessed through $wgTitle since
2615                                 # there's no other way).  In principle, this could lead to issues
2616                                 # with having the same name for different feeds corresponding to
2617                                 # the same page, but we can't avoid that at this low a level.
2618
2619                                 $tags[] = $this->feedLink(
2620                                         $format,
2621                                         $link,
2622                                         # Used messages: 'page-rss-feed' and 'page-atom-feed' (for an easier grep)
2623                                         wfMsg( "page-{$format}-feed", $this->getTitle()->getPrefixedText() )
2624                                 );
2625                         }
2626
2627                         # Recent changes feed should appear on every page (except recentchanges,
2628                         # that would be redundant). Put it after the per-page feed to avoid
2629                         # changing existing behavior. It's still available, probably via a
2630                         # menu in your browser. Some sites might have a different feed they'd
2631                         # like to promote instead of the RC feed (maybe like a "Recent New Articles"
2632                         # or "Breaking news" one). For this, we see if $wgOverrideSiteFeed is defined.
2633                         # If so, use it instead.
2634
2635                         global $wgOverrideSiteFeed, $wgSitename, $wgAdvertisedFeedTypes;
2636                         $rctitle = SpecialPage::getTitleFor( 'Recentchanges' );
2637
2638                         if ( $wgOverrideSiteFeed ) {
2639                                 foreach ( $wgOverrideSiteFeed as $type => $feedUrl ) {
2640                                         $tags[] = $this->feedLink(
2641                                                 $type,
2642                                                 htmlspecialchars( $feedUrl ),
2643                                                 wfMsg( "site-{$type}-feed", $wgSitename )
2644                                         );
2645                                 }
2646                         } elseif ( $this->getTitle()->getPrefixedText() != $rctitle->getPrefixedText() ) {
2647                                 foreach ( $wgAdvertisedFeedTypes as $format ) {
2648                                         $tags[] = $this->feedLink(
2649                                                 $format,
2650                                                 $rctitle->getLocalURL( "feed={$format}" ),
2651                                                 wfMsg( "site-{$format}-feed", $wgSitename ) # For grep: 'site-rss-feed', 'site-atom-feed'.
2652                                         );
2653                                 }
2654                         }
2655                 }
2656                 return implode( "\n", $tags );
2657         }
2658
2659         /**
2660          * Generate a <link rel/> for a feed.
2661          *
2662          * @param $type String: feed type
2663          * @param $url String: URL to the feed
2664          * @param $text String: value of the "title" attribute
2665          * @return String: HTML fragment
2666          */
2667         private function feedLink( $type, $url, $text ) {
2668                 return Html::element( 'link', array(
2669                         'rel' => 'alternate',
2670                         'type' => "application/$type+xml",
2671                         'title' => $text,
2672                         'href' => $url )
2673                 );
2674         }
2675
2676         /**
2677          * Add a local or specified stylesheet, with the given media options.
2678          * Meant primarily for internal use...
2679          *
2680          * @param $style String: URL to the file
2681          * @param $media String: to specify a media type, 'screen', 'printable', 'handheld' or any.
2682          * @param $condition String: for IE conditional comments, specifying an IE version
2683          * @param $dir String: set to 'rtl' or 'ltr' for direction-specific sheets
2684          */
2685         public function addStyle( $style, $media = '', $condition = '', $dir = '' ) {
2686                 $options = array();
2687                 // Even though we expect the media type to be lowercase, but here we
2688                 // force it to lowercase to be safe.
2689                 if( $media ) {
2690                         $options['media'] = $media;
2691                 }
2692                 if( $condition ) {
2693                         $options['condition'] = $condition;
2694                 }
2695                 if( $dir ) {
2696                         $options['dir'] = $dir;
2697                 }
2698                 $this->styles[$style] = $options;
2699         }
2700
2701         /**
2702          * Adds inline CSS styles
2703          * @param $style_css Mixed: inline CSS
2704          */
2705         public function addInlineStyle( $style_css ){
2706                 $this->mInlineStyles .= Html::inlineStyle( $style_css );
2707         }
2708
2709         /**
2710          * Build a set of <link>s for the stylesheets specified in the $this->styles array.
2711          * These will be applied to various media & IE conditionals.
2712          * @param $sk Skin object
2713          */
2714         public function buildCssLinks( $sk ) {
2715                 $ret = '';
2716                 // Add ResourceLoader styles
2717                 // Split the styles into three groups
2718                 $styles = array( 'other' => array(), 'user' => array(), 'site' => array() );
2719                 $resourceLoader = $this->getResourceLoader();
2720                 foreach ( $this->getModuleStyles() as $name ) {
2721                         $group = $resourceLoader->getModule( $name )->getGroup();
2722                         // Modules in groups named "other" or anything different than "user" or "site" will
2723                         // be placed in the "other" group
2724                         $styles[isset( $styles[$group] ) ? $group : 'other'][] = $name;
2725                 }
2726
2727                 // We want site and user styles to override dynamically added styles from modules, but we want
2728                 // dynamically added styles to override statically added styles from other modules. So the order
2729                 // has to be other, dynamic, site, user
2730                 // Add statically added styles for other modules
2731                 $ret .= $this->makeResourceLoaderLink( $sk, $styles['other'], 'styles' );
2732                 // Add normal styles added through addStyle()/addInlineStyle() here
2733                 $ret .= implode( "\n", $this->buildCssLinksArray() ) . $this->mInlineStyles;
2734                 // Add marker tag to mark the place where the client-side loader should inject dynamic styles
2735                 // We use a <meta> tag with a made-up name for this because that's valid HTML
2736                 $ret .= Html::element( 'meta', array( 'name' => 'ResourceLoaderDynamicStyles', 'content' => '' ) );
2737                 // Add site and user styles
2738                 $ret .= $this->makeResourceLoaderLink(
2739                         $sk, array_merge( $styles['site'], $styles['user'] ), 'styles'
2740                 );
2741                 return $ret;
2742         }
2743
2744         public function buildCssLinksArray() {
2745                 $links = array();
2746                 foreach( $this->styles as $file => $options ) {
2747                         $link = $this->styleLink( $file, $options );
2748                         if( $link ) {
2749                                 $links[$file] = $link;
2750                         }
2751                 }
2752                 return $links;
2753         }
2754
2755         /**
2756          * Generate \<link\> tags for stylesheets
2757          *
2758          * @param $style String: URL to the file
2759          * @param $options Array: option, can contain 'condition', 'dir', 'media'
2760          *                 keys
2761          * @return String: HTML fragment
2762          */
2763         protected function styleLink( $style, $options ) {
2764                 if( isset( $options['dir'] ) ) {
2765                         $siteDir = wfUILang()->getDir();
2766                         if( $siteDir != $options['dir'] ) {
2767                                 return '';
2768                         }
2769                 }
2770
2771                 if( isset( $options['media'] ) ) {
2772                         $media = self::transformCssMedia( $options['media'] );
2773                         if( is_null( $media ) ) {
2774                                 return '';
2775                         }
2776                 } else {
2777                         $media = 'all';
2778                 }
2779
2780                 if( substr( $style, 0, 1 ) == '/' ||
2781                         substr( $style, 0, 5 ) == 'http:' ||
2782                         substr( $style, 0, 6 ) == 'https:' ) {
2783                         $url = $style;
2784                 } else {
2785                         global $wgStylePath, $wgStyleVersion;
2786                         $url = $wgStylePath . '/' . $style . '?' . $wgStyleVersion;
2787                 }
2788
2789                 $link = Html::linkedStyle( $url, $media );
2790
2791                 if( isset( $options['condition'] ) ) {
2792                         $condition = htmlspecialchars( $options['condition'] );
2793                         $link = "<!--[if $condition]>$link<![endif]-->";
2794                 }
2795                 return $link;
2796         }
2797
2798         /**
2799          * Transform "media" attribute based on request parameters
2800          *
2801          * @param $media String: current value of the "media" attribute
2802          * @return String: modified value of the "media" attribute
2803          */
2804         public static function transformCssMedia( $media ) {
2805                 global $wgRequest, $wgHandheldForIPhone;
2806
2807                 // Switch in on-screen display for media testing
2808                 $switches = array(
2809                         'printable' => 'print',
2810                         'handheld' => 'handheld',
2811                 );
2812                 foreach( $switches as $switch => $targetMedia ) {
2813                         if( $wgRequest->getBool( $switch ) ) {
2814                                 if( $media == $targetMedia ) {
2815                                         $media = '';
2816                                 } elseif( $media == 'screen' ) {
2817                                         return null;
2818                                 }
2819                         }
2820                 }
2821
2822                 // Expand longer media queries as iPhone doesn't grok 'handheld'
2823                 if( $wgHandheldForIPhone ) {
2824                         $mediaAliases = array(
2825                                 'screen' => 'screen and (min-device-width: 481px)',
2826                                 'handheld' => 'handheld, only screen and (max-device-width: 480px)',
2827                         );
2828
2829                         if( isset( $mediaAliases[$media] ) ) {
2830                                 $media = $mediaAliases[$media];
2831                         }
2832                 }
2833
2834                 return $media;
2835         }
2836
2837         /**
2838          * Turn off regular page output and return an error reponse
2839          * for when rate limiting has triggered.
2840          */
2841         public function rateLimited() {
2842                 $this->setPageTitle( wfMsg( 'actionthrottled' ) );
2843                 $this->setRobotPolicy( 'noindex,follow' );
2844                 $this->setArticleRelated( false );
2845                 $this->enableClientCache( false );
2846                 $this->mRedirect = '';
2847                 $this->clearHTML();
2848                 $this->setStatusCode( 503 );
2849                 $this->addWikiMsg( 'actionthrottledtext' );
2850
2851                 $this->returnToMain( null, $this->getTitle() );
2852         }
2853
2854         /**
2855          * Show a warning about slave lag
2856          *
2857          * If the lag is higher than $wgSlaveLagCritical seconds,
2858          * then the warning is a bit more obvious. If the lag is
2859          * lower than $wgSlaveLagWarning, then no warning is shown.
2860          *
2861          * @param $lag Integer: slave lag
2862          */
2863         public function showLagWarning( $lag ) {
2864                 global $wgSlaveLagWarning, $wgSlaveLagCritical, $wgLang;
2865                 if( $lag >= $wgSlaveLagWarning ) {
2866                         $message = $lag < $wgSlaveLagCritical
2867                                 ? 'lag-warn-normal'
2868                                 : 'lag-warn-high';
2869                         $wrap = Html::rawElement( 'div', array( 'class' => "mw-{$message}" ), "\n$1\n" );
2870                         $this->wrapWikiMsg( "$wrap\n", array( $message, $wgLang->formatNum( $lag ) ) );
2871                 }
2872         }
2873
2874         /**
2875          * Add a wikitext-formatted message to the output.
2876          * This is equivalent to:
2877          *
2878          *    $wgOut->addWikiText( wfMsgNoTrans( ... ) )
2879          */
2880         public function addWikiMsg( /*...*/ ) {
2881                 $args = func_get_args();
2882                 $name = array_shift( $args );
2883                 $this->addWikiMsgArray( $name, $args );
2884         }
2885
2886         /**
2887          * Add a wikitext-formatted message to the output.
2888          * Like addWikiMsg() except the parameters are taken as an array
2889          * instead of a variable argument list.
2890          *
2891          * $options is passed through to wfMsgExt(), see that function for details.
2892          */
2893         public function addWikiMsgArray( $name, $args, $options = array() ) {
2894                 $options[] = 'parse';
2895                 $text = wfMsgExt( $name, $options, $args );
2896                 $this->addHTML( $text );
2897         }
2898
2899         /**
2900          * This function takes a number of message/argument specifications, wraps them in
2901          * some overall structure, and then parses the result and adds it to the output.
2902          *
2903          * In the $wrap, $1 is replaced with the first message, $2 with the second, and so
2904          * on. The subsequent arguments may either be strings, in which case they are the
2905          * message names, or arrays, in which case the first element is the message name,
2906          * and subsequent elements are the parameters to that message.
2907          *
2908          * The special named parameter 'options' in a message specification array is passed
2909          * through to the $options parameter of wfMsgExt().
2910          *
2911          * Don't use this for messages that are not in users interface language.
2912          *
2913          * For example:
2914          *
2915          *    $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>", 'some-error' );
2916          *
2917          * Is equivalent to:
2918          *
2919          *    $wgOut->addWikiText( "<div class='error'>\n" . wfMsgNoTrans( 'some-error' ) . "\n</div>" );
2920          *
2921          * The newline after opening div is needed in some wikitext. See bug 19226.
2922          */
2923         public function wrapWikiMsg( $wrap /*, ...*/ ) {
2924                 $msgSpecs = func_get_args();
2925                 array_shift( $msgSpecs );
2926                 $msgSpecs = array_values( $msgSpecs );
2927                 $s = $wrap;
2928                 foreach ( $msgSpecs as $n => $spec ) {
2929                         $options = array();
2930                         if ( is_array( $spec ) ) {
2931                                 $args = $spec;
2932                                 $name = array_shift( $args );
2933                                 if ( isset( $args['options'] ) ) {
2934                                         $options = $args['options'];
2935                                         unset( $args['options'] );
2936                                 }
2937                         }  else {
2938                                 $args = array();
2939                                 $name = $spec;
2940                         }
2941                         $s = str_replace( '$' . ( $n + 1 ), wfMsgExt( $name, $options, $args ), $s );
2942                 }
2943                 $this->addHTML( $this->parse( $s, /*linestart*/true, /*uilang*/true ) );
2944         }
2945
2946         /**
2947          * Include jQuery core. Use this to avoid loading it multiple times
2948          * before we get a usable script loader.
2949          *
2950          * @param $modules Array: list of jQuery modules which should be loaded
2951          * @return Array: the list of modules which were not loaded.
2952          * @since 1.16
2953          * @deprecated @since 1.17
2954          */
2955         public function includeJQuery( $modules = array() ) {
2956                 return array();
2957         }
2958
2959 }