includes/OutputPage.php

   1 <?php
   2 if ( !defined( 'MEDIAWIKI' ) ) {
   3         die( 1 );
   4 }
   5
   6 /**
   7  * This class should be covered by a general architecture document which does
   8  * not exist as of January 2011.  This is one of the Core classes and should
   9  * be read at least once by any new developers.
  10  *
  11  * This class is used to prepare the final rendering. A skin is then
  12  * applied to the output parameters (links, javascript, html, categories ...).
  13  *
  14  * @todo FIXME: Another class handles sending the whole page to the client.
  15  *
  16  * Some comments comes from a pairing session between Zak Greant and Antoine Musso
  17  * in November 2010.
  18  *
  19  * @todo document
  20  */
  21 class OutputPage extends ContextSource {
  22         /// Should be private. Used with addMeta() which adds <meta>
  23         var $mMetatags = array();
  24
  25         /// <meta keyworkds="stuff"> most of the time the first 10 links to an article
  26         var $mKeywords = array();
  27
  28         var $mLinktags = array();
  29
  30         /// Additional stylesheets. Looks like this is for extensions. Might be replaced by resource loader.
  31         var $mExtStyles = array();
  32
  33         /// Should be private - has getter and setter. Contains the HTML title
  34         var $mPagetitle = '';
  35
  36         /// Contains all of the <body> content. Should be private we got set/get accessors and the append() method.
  37         var $mBodytext = '';
  38
  39         /**
  40          * Holds the debug lines that will be output as comments in page source if
  41          * $wgDebugComments is enabled. See also $wgShowDebug.
  42          * TODO: make a getter method for this
  43          */
  44         public $mDebugtext = ''; // TODO: we might want to replace it by wfDebug() wfDebugLog()
  45
  46         /// Should be private. Stores contents of <title> tag
  47         var $mHTMLtitle = '';
  48
  49         /// Should be private. Is the displayed content related to the source of the corresponding wiki article.
  50         var $mIsarticle = false;
  51
  52         /**
  53          * Should be private. Has get/set methods properly documented.
  54          * Stores "article flag" toggle.
  55          */
  56         var $mIsArticleRelated = true;
  57
  58         /**
  59          * Should be private. We have to set isPrintable(). Some pages should
  60          * never be printed (ex: redirections).
  61          */
  62         var $mPrintable = false;
  63
  64         /**
  65          * Should be private. We have set/get/append methods.
  66          *
  67          * Contains the page subtitle. Special pages usually have some links here.
  68          * Don't confuse with site subtitle added by skins.
  69          */
  70         private $mSubtitle = array();
  71
  72         var $mRedirect = '';
  73         var $mStatusCode;
  74
  75         /**
  76          * mLastModified and mEtag are used for sending cache control.
  77          * The whole caching system should probably be moved into its own class.
  78          */
  79         var $mLastModified = '';
  80
  81         /**
  82          * Should be private. No getter but used in sendCacheControl();
  83          * Contains an HTTP Entity Tags (see RFC 2616 section 3.13) which is used
  84          * as a unique identifier for the content. It is later used by the client
  85          * to compare its cached version with the server version. Client sends
  86          * headers If-Match and If-None-Match containing its locally cached ETAG value.
  87          *
  88          * To get more information, you will have to look at HTTP/1.1 protocol which
  89          * is properly described in RFC 2616 : http://tools.ietf.org/html/rfc2616
  90          */
  91         var $mETag = false;
  92
  93         var $mCategoryLinks = array();
  94         var $mCategories = array();
  95
  96         /// Should be private. Array of Interwiki Prefixed (non DB key) Titles (e.g. 'fr:Test page')
  97         var $mLanguageLinks = array();
  98
  99         /**
 100          * Should be private. Used for JavaScript (pre resource loader)
 101          * We should split js / css.
 102          * mScripts content is inserted as is in <head> by Skin. This might contains
 103          * either a link to a stylesheet or inline css.
 104          */
 105         var $mScripts = '';
 106
 107         /**
 108          * Inline CSS styles. Use addInlineStyle() sparsingly
 109          */
 110         var $mInlineStyles = '';
 111
 112         //
 113         var $mLinkColours;
 114
 115         /**
 116          * Used by skin template.
 117          * Example: $tpl->set( 'displaytitle', $out->mPageLinkTitle );
 118          */
 119         var $mPageLinkTitle = '';
 120
 121         /// Array of elements in <head>. Parser might add its own headers!
 122         var $mHeadItems = array();
 123
 124         // @todo FIXME: Next variables probably comes from the resource loader
 125         var $mModules = array(), $mModuleScripts = array(), $mModuleStyles = array(), $mModuleMessages = array();
 126         var $mResourceLoader;
 127         var $mJsConfigVars = array();
 128
 129         /** @todo FIXME: Is this still used ?*/
 130         var $mInlineMsg = array();
 131
 132         var $mTemplateIds = array();
 133         var $mImageTimeKeys = array();
 134
 135         var $mRedirectCode = '';
 136
 137         var $mFeedLinksAppendQuery = null;
 138
 139         # What level of 'untrustworthiness' is allowed in CSS/JS modules loaded on this page?
 140         # @see ResourceLoaderModule::$origin
 141         # ResourceLoaderModule::ORIGIN_ALL is assumed unless overridden;
 142         protected $mAllowedModules = array(
 143                 ResourceLoaderModule::TYPE_COMBINED => ResourceLoaderModule::ORIGIN_ALL,
 144         );
 145
 146         /**
 147          * @EasterEgg I just love the name for this self documenting variable.
 148          * @todo document
 149          */
 150         var $mDoNothing = false;
 151
 152         // Parser related.
 153         var $mContainsOldMagic = 0, $mContainsNewMagic = 0;
 154
 155         /**
 156          * lazy initialised, use parserOptions()
 157          * @var ParserOptions
 158          */
 159         protected $mParserOptions = null;
 160
 161         /**
 162          * Handles the atom / rss links.
 163          * We probably only support atom in 2011.
 164          * Looks like a private variable.
 165          * @see $wgAdvertisedFeedTypes
 166          */
 167         var $mFeedLinks = array();
 168
 169         // Gwicke work on squid caching? Roughly from 2003.
 170         var $mEnableClientCache = true;
 171
 172         /**
 173          * Flag if output should only contain the body of the article.
 174          * Should be private.
 175          */
 176         var $mArticleBodyOnly = false;
 177
 178         var $mNewSectionLink = false;
 179         var $mHideNewSectionLink = false;
 180
 181         /**
 182          * Comes from the parser. This was probably made to load CSS/JS only
 183          * if we had <gallery>. Used directly in CategoryPage.php
 184          * Looks like resource loader can replace this.
 185          */
 186         var $mNoGallery = false;
 187
 188         // should be private.
 189         var $mPageTitleActionText = '';
 190         var $mParseWarnings = array();
 191
 192         // Cache stuff. Looks like mEnableClientCache
 193         var $mSquidMaxage = 0;
 194
 195         // @todo document
 196         var $mPreventClickjacking = true;
 197
 198         /// should be private. To include the variable {{REVISIONID}}
 199         var $mRevisionId = null;
 200         private $mRevisionTimestamp = null;
 201
 202         var $mFileVersion = null;
 203
 204         /**
 205          * An array of stylesheet filenames (relative from skins path), with options
 206          * for CSS media, IE conditions, and RTL/LTR direction.
 207          * For internal use; add settings in the skin via $this->addStyle()
 208          *
 209          * Style again! This seems like a code duplication since we already have
 210          * mStyles. This is what makes OpenSource amazing.
 211          */
 212         var $styles = array();
 213
 214         /**
 215          * Whether jQuery is already handled.
 216          */
 217         protected $mJQueryDone = false;
 218
 219         private $mIndexPolicy = 'index';
 220         private $mFollowPolicy = 'follow';
 221         private $mVaryHeader = array(
 222                 'Accept-Encoding' => array( 'list-contains=gzip' ),
 223                 'Cookie' => null
 224         );
 225
 226         /**
 227          * If the current page was reached through a redirect, $mRedirectedFrom contains the Title
 228          * of the redirect.
 229          *
 230          * @var Title
 231          */
 232         private $mRedirectedFrom = null;
 233
 234         /**
 235          * Constructor for OutputPage. This should not be called directly.
 236          * Instead a new RequestContext should be created and it will implicitly create
 237          * a OutputPage tied to that context.
 238          */
 239         function __construct( IContextSource $context = null ) {
 240                 if ( $context === null ) {
 241                         # Extensions should use `new RequestContext` instead of `new OutputPage` now.
 242                         wfDeprecated( __METHOD__ );
 243                 } else {
 244                         $this->setContext( $context );
 245                 }
 246         }
 247
 248         /**
 249          * Redirect to $url rather than displaying the normal page
 250          *
 251          * @param $url String: URL
 252          * @param $responsecode String: HTTP status code
 253          */
 254         public function redirect( $url, $responsecode = '302' ) {
 255                 # Strip newlines as a paranoia check for header injection in PHP<5.1.2
 256                 $this->mRedirect = str_replace( "\n", '', $url );
 257                 $this->mRedirectCode = $responsecode;
 258         }
 259
 260         /**
 261          * Get the URL to redirect to, or an empty string if not redirect URL set
 262          *
 263          * @return String
 264          */
 265         public function getRedirect() {
 266                 return $this->mRedirect;
 267         }
 268
 269         /**
 270          * Set the HTTP status code to send with the output.
 271          *
 272          * @param $statusCode Integer
 273          */
 274         public function setStatusCode( $statusCode ) {
 275                 $this->mStatusCode = $statusCode;
 276         }
 277
 278         /**
 279          * Add a new <meta> tag
 280          * To add an http-equiv meta tag, precede the name with "http:"
 281          *
 282          * @param $name String tag name
 283          * @param $val String tag value
 284          */
 285         function addMeta( $name, $val ) {
 286                 array_push( $this->mMetatags, array( $name, $val ) );
 287         }
 288
 289         /**
 290          * Add a keyword or a list of keywords in the page header
 291          *
 292          * @param $text String or array of strings
 293          */
 294         function addKeyword( $text ) {
 295                 if( is_array( $text ) ) {
 296                         $this->mKeywords = array_merge( $this->mKeywords, $text );
 297                 } else {
 298                         array_push( $this->mKeywords, $text );
 299                 }
 300         }
 301
 302         /**
 303          * Add a new \<link\> tag to the page header
 304          *
 305          * @param $linkarr Array: associative array of attributes.
 306          */
 307         function addLink( $linkarr ) {
 308                 array_push( $this->mLinktags, $linkarr );
 309         }
 310
 311         /**
 312          * Add a new \<link\> with "rel" attribute set to "meta"
 313          *
 314          * @param $linkarr Array: associative array mapping attribute names to their
 315          *                 values, both keys and values will be escaped, and the
 316          *                 "rel" attribute will be automatically added
 317          */
 318         function addMetadataLink( $linkarr ) {
 319                 $linkarr['rel'] = $this->getMetadataAttribute();
 320                 $this->addLink( $linkarr );
 321         }
 322
 323         /**
 324          * Get the value of the "rel" attribute for metadata links
 325          *
 326          * @return String
 327          */
 328         public function getMetadataAttribute() {
 329                 # note: buggy CC software only reads first "meta" link
 330                 static $haveMeta = false;
 331                 if ( $haveMeta ) {
 332                         return 'alternate meta';
 333                 } else {
 334                         $haveMeta = true;
 335                         return 'meta';
 336                 }
 337         }
 338
 339         /**
 340          * Add raw HTML to the list of scripts (including \<script\> tag, etc.)
 341          *
 342          * @param $script String: raw HTML
 343          */
 344         function addScript( $script ) {
 345                 $this->mScripts .= $script . "\n";
 346         }
 347
 348         /**
 349          * Register and add a stylesheet from an extension directory.
 350          *
 351          * @param $url String path to sheet.  Provide either a full url (beginning
 352          *             with 'http', etc) or a relative path from the document root
 353          *             (beginning with '/').  Otherwise it behaves identically to
 354          *             addStyle() and draws from the /skins folder.
 355          */
 356         public function addExtensionStyle( $url ) {
 357                 array_push( $this->mExtStyles, $url );
 358         }
 359
 360         /**
 361          * Get all styles added by extensions
 362          *
 363          * @return Array
 364          */
 365         function getExtStyle() {
 366                 return $this->mExtStyles;
 367         }
 368
 369         /**
 370          * Add a JavaScript file out of skins/common, or a given relative path.
 371          *
 372          * @param $file String: filename in skins/common or complete on-server path
 373          *              (/foo/bar.js)
 374          * @param $version String: style version of the file. Defaults to $wgStyleVersion
 375          */
 376         public function addScriptFile( $file, $version = null ) {
 377                 global $wgStylePath, $wgStyleVersion;
 378                 // See if $file parameter is an absolute URL or begins with a slash
 379                 if( substr( $file, 0, 1 ) == '/' || preg_match( '#^[a-z]*://#i', $file ) ) {
 380                         $path = $file;
 381                 } else {
 382                         $path = "{$wgStylePath}/common/{$file}";
 383                 }
 384                 if ( is_null( $version ) )
 385                         $version = $wgStyleVersion;
 386                 $this->addScript( Html::linkedScript( wfAppendQuery( $path, $version ) ) );
 387         }
 388
 389         /**
 390          * Add a self-contained script tag with the given contents
 391          *
 392          * @param $script String: JavaScript text, no <script> tags
 393          */
 394         public function addInlineScript( $script ) {
 395                 $this->mScripts .= Html::inlineScript( "\n$script\n" ) . "\n";
 396         }
 397
 398         /**
 399          * Get all registered JS and CSS tags for the header.
 400          *
 401          * @return String
 402          */
 403         function getScript() {
 404                 return $this->mScripts . $this->getHeadItems();
 405         }
 406
 407         /**
 408          * Filter an array of modules to remove insufficiently trustworthy members, and modules
 409          * which are no longer registered (eg a page is cached before an extension is disabled)
 410          * @param $modules Array
 411          * @param $position String if not null, only return modules with this position
 412          * @param $type string
 413          * @return Array
 414          */
 415         protected function filterModules( $modules, $position = null, $type = ResourceLoaderModule::TYPE_COMBINED ){
 416                 $resourceLoader = $this->getResourceLoader();
 417                 $filteredModules = array();
 418                 foreach( $modules as $val ){
 419                         $module = $resourceLoader->getModule( $val );
 420                         if( $module instanceof ResourceLoaderModule
 421                                 && $module->getOrigin() <= $this->getAllowedModules( $type )
 422                                 && ( is_null( $position ) || $module->getPosition() == $position ) )
 423                         {
 424                                 $filteredModules[] = $val;
 425                         }
 426                 }
 427                 return $filteredModules;
 428         }
 429
 430         /**
 431          * Get the list of modules to include on this page
 432          *
 433          * @param $filter Bool whether to filter out insufficiently trustworthy modules
 434          * @param $position String if not null, only return modules with this position
 435          * @param $param string
 436          * @return Array of module names
 437          */
 438         public function getModules( $filter = false, $position = null, $param = 'mModules' ) {
 439                 $modules = array_values( array_unique( $this->$param ) );
 440                 return $filter
 441                         ? $this->filterModules( $modules, $position )
 442                         : $modules;
 443         }
 444
 445         /**
 446          * Add one or more modules recognized by the resource loader. Modules added
 447          * through this function will be loaded by the resource loader when the
 448          * page loads.
 449          *
 450          * @param $modules Mixed: module name (string) or array of module names
 451          */
 452         public function addModules( $modules ) {
 453                 $this->mModules = array_merge( $this->mModules, (array)$modules );
 454         }
 455
 456         /**
 457          * Get the list of module JS to include on this page
 458          *
 459          * @param $filter
 460          * @param $position
 461          *
 462          * @return array of module names
 463          */
 464         public function getModuleScripts( $filter = false, $position = null ) {
 465                 return $this->getModules( $filter, $position, 'mModuleScripts' );
 466         }
 467
 468         /**
 469          * Add only JS of one or more modules recognized by the resource loader. Module
 470          * scripts added through this function will be loaded by the resource loader when
 471          * the page loads.
 472          *
 473          * @param $modules Mixed: module name (string) or array of module names
 474          */
 475         public function addModuleScripts( $modules ) {
 476                 $this->mModuleScripts = array_merge( $this->mModuleScripts, (array)$modules );
 477         }
 478
 479         /**
 480          * Get the list of module CSS to include on this page
 481          *
 482          * @param $filter
 483          * @param $position
 484          *
 485          * @return Array of module names
 486          */
 487         public function getModuleStyles( $filter = false, $position = null ) {
 488                 return $this->getModules( $filter,  $position, 'mModuleStyles' );
 489         }
 490
 491         /**
 492          * Add only CSS of one or more modules recognized by the resource loader. Module
 493          * styles added through this function will be loaded by the resource loader when
 494          * the page loads.
 495          *
 496          * @param $modules Mixed: module name (string) or array of module names
 497          */
 498         public function addModuleStyles( $modules ) {
 499                 $this->mModuleStyles = array_merge( $this->mModuleStyles, (array)$modules );
 500         }
 501
 502         /**
 503          * Get the list of module messages to include on this page
 504          *
 505          * @param $filter
 506          * @param $position
 507          *
 508          * @return Array of module names
 509          */
 510         public function getModuleMessages( $filter = false, $position = null ) {
 511                 return $this->getModules( $filter, $position, 'mModuleMessages' );
 512         }
 513
 514         /**
 515          * Add only messages of one or more modules recognized by the resource loader.
 516          * Module messages added through this function will be loaded by the resource
 517          * loader when the page loads.
 518          *
 519          * @param $modules Mixed: module name (string) or array of module names
 520          */
 521         public function addModuleMessages( $modules ) {
 522                 $this->mModuleMessages = array_merge( $this->mModuleMessages, (array)$modules );
 523         }
 524
 525         /**
 526          * Get an array of head items
 527          *
 528          * @return Array
 529          */
 530         function getHeadItemsArray() {
 531                 return $this->mHeadItems;
 532         }
 533
 534         /**
 535          * Get all header items in a string
 536          *
 537          * @return String
 538          */
 539         function getHeadItems() {
 540                 $s = '';
 541                 foreach ( $this->mHeadItems as $item ) {
 542                         $s .= $item;
 543                 }
 544                 return $s;
 545         }
 546
 547         /**
 548          * Add or replace an header item to the output
 549          *
 550          * @param $name String: item name
 551          * @param $value String: raw HTML
 552          */
 553         public function addHeadItem( $name, $value ) {
 554                 $this->mHeadItems[$name] = $value;
 555         }
 556
 557         /**
 558          * Check if the header item $name is already set
 559          *
 560          * @param $name String: item name
 561          * @return Boolean
 562          */
 563         public function hasHeadItem( $name ) {
 564                 return isset( $this->mHeadItems[$name] );
 565         }
 566
 567         /**
 568          * Set the value of the ETag HTTP header, only used if $wgUseETag is true
 569          *
 570          * @param $tag String: value of "ETag" header
 571          */
 572         function setETag( $tag ) {
 573                 $this->mETag = $tag;
 574         }
 575
 576         /**
 577          * Set whether the output should only contain the body of the article,
 578          * without any skin, sidebar, etc.
 579          * Used e.g. when calling with "action=render".
 580          *
 581          * @param $only Boolean: whether to output only the body of the article
 582          */
 583         public function setArticleBodyOnly( $only ) {
 584                 $this->mArticleBodyOnly = $only;
 585         }
 586
 587         /**
 588          * Return whether the output will contain only the body of the article
 589          *
 590          * @return Boolean
 591          */
 592         public function getArticleBodyOnly() {
 593                 return $this->mArticleBodyOnly;
 594         }
 595
 596         /**
 597          * checkLastModified tells the client to use the client-cached page if
 598          * possible. If sucessful, the OutputPage is disabled so that
 599          * any future call to OutputPage->output() have no effect.
 600          *
 601          * Side effect: sets mLastModified for Last-Modified header
 602          *
 603          * @param $timestamp string
 604          *
 605          * @return Boolean: true iff cache-ok headers was sent.
 606          */
 607         public function checkLastModified( $timestamp ) {
 608                 global $wgCachePages, $wgCacheEpoch;
 609
 610                 if ( !$timestamp || $timestamp == '19700101000000' ) {
 611                         wfDebug( __METHOD__ . ": CACHE DISABLED, NO TIMESTAMP\n" );
 612                         return false;
 613                 }
 614                 if( !$wgCachePages ) {
 615                         wfDebug( __METHOD__ . ": CACHE DISABLED\n", false );
 616                         return false;
 617                 }
 618                 if( $this->getUser()->getOption( 'nocache' ) ) {
 619                         wfDebug( __METHOD__ . ": USER DISABLED CACHE\n", false );
 620                         return false;
 621                 }
 622
 623                 $timestamp = wfTimestamp( TS_MW, $timestamp );
 624                 $modifiedTimes = array(
 625                         'page' => $timestamp,
 626                         'user' => $this->getUser()->getTouched(),
 627                         'epoch' => $wgCacheEpoch
 628                 );
 629                 wfRunHooks( 'OutputPageCheckLastModified', array( &$modifiedTimes ) );
 630
 631                 $maxModified = max( $modifiedTimes );
 632                 $this->mLastModified = wfTimestamp( TS_RFC2822, $maxModified );
 633
 634                 if( empty( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) ) {
 635                         wfDebug( __METHOD__ . ": client did not send If-Modified-Since header\n", false );
 636                         return false;
 637                 }
 638
 639                 # Make debug info
 640                 $info = '';
 641                 foreach ( $modifiedTimes as $name => $value ) {
 642                         if ( $info !== '' ) {
 643                                 $info .= ', ';
 644                         }
 645                         $info .= "$name=" . wfTimestamp( TS_ISO_8601, $value );
 646                 }
 647
 648                 # IE sends sizes after the date like this:
 649                 # Wed, 20 Aug 2003 06:51:19 GMT; length=5202
 650                 # this breaks strtotime().
 651                 $clientHeader = preg_replace( '/;.*$/', '', $_SERVER["HTTP_IF_MODIFIED_SINCE"] );
 652
 653                 wfSuppressWarnings(); // E_STRICT system time bitching
 654                 $clientHeaderTime = strtotime( $clientHeader );
 655                 wfRestoreWarnings();
 656                 if ( !$clientHeaderTime ) {
 657                         wfDebug( __METHOD__ . ": unable to parse the client's If-Modified-Since header: $clientHeader\n" );
 658                         return false;
 659                 }
 660                 $clientHeaderTime = wfTimestamp( TS_MW, $clientHeaderTime );
 661
 662                 wfDebug( __METHOD__ . ": client sent If-Modified-Since: " .
 663                         wfTimestamp( TS_ISO_8601, $clientHeaderTime ) . "\n", false );
 664                 wfDebug( __METHOD__ . ": effective Last-Modified: " .
 665                         wfTimestamp( TS_ISO_8601, $maxModified ) . "\n", false );
 666                 if( $clientHeaderTime < $maxModified ) {
 667                         wfDebug( __METHOD__ . ": STALE, $info\n", false );
 668                         return false;
 669                 }
 670
 671                 # Not modified
 672                 # Give a 304 response code and disable body output
 673                 wfDebug( __METHOD__ . ": NOT MODIFIED, $info\n", false );
 674                 ini_set( 'zlib.output_compression', 0 );
 675                 $this->getRequest()->response()->header( "HTTP/1.1 304 Not Modified" );
 676                 $this->sendCacheControl();
 677                 $this->disable();
 678
 679                 // Don't output a compressed blob when using ob_gzhandler;
 680                 // it's technically against HTTP spec and seems to confuse
 681                 // Firefox when the response gets split over two packets.
 682                 wfClearOutputBuffers();
 683
 684                 return true;
 685         }
 686
 687         /**
 688          * Override the last modified timestamp
 689          *
 690          * @param $timestamp String: new timestamp, in a format readable by
 691          *        wfTimestamp()
 692          */
 693         public function setLastModified( $timestamp ) {
 694                 $this->mLastModified = wfTimestamp( TS_RFC2822, $timestamp );
 695         }
 696
 697         /**
 698          * Set the robot policy for the page: <http://www.robotstxt.org/meta.html>
 699          *
 700          * @param $policy String: the literal string to output as the contents of
 701          *   the meta tag.  Will be parsed according to the spec and output in
 702          *   standardized form.
 703          * @return null
 704          */
 705         public function setRobotPolicy( $policy ) {
 706                 $policy = Article::formatRobotPolicy( $policy );
 707
 708                 if( isset( $policy['index'] ) ) {
 709                         $this->setIndexPolicy( $policy['index'] );
 710                 }
 711                 if( isset( $policy['follow'] ) ) {
 712                         $this->setFollowPolicy( $policy['follow'] );
 713                 }
 714         }
 715
 716         /**
 717          * Set the index policy for the page, but leave the follow policy un-
 718          * touched.
 719          *
 720          * @param $policy string Either 'index' or 'noindex'.
 721          * @return null
 722          */
 723         public function setIndexPolicy( $policy ) {
 724                 $policy = trim( $policy );
 725                 if( in_array( $policy, array( 'index', 'noindex' ) ) ) {
 726                         $this->mIndexPolicy = $policy;
 727                 }
 728         }
 729
 730         /**
 731          * Set the follow policy for the page, but leave the index policy un-
 732          * touched.
 733          *
 734          * @param $policy String: either 'follow' or 'nofollow'.
 735          * @return null
 736          */
 737         public function setFollowPolicy( $policy ) {
 738                 $policy = trim( $policy );
 739                 if( in_array( $policy, array( 'follow', 'nofollow' ) ) ) {
 740                         $this->mFollowPolicy = $policy;
 741                 }
 742         }
 743
 744         /**
 745          * Set the new value of the "action text", this will be added to the
 746          * "HTML title", separated from it with " - ".
 747          *
 748          * @param $text String: new value of the "action text"
 749          */
 750         public function setPageTitleActionText( $text ) {
 751                 $this->mPageTitleActionText = $text;
 752         }
 753
 754         /**
 755          * Get the value of the "action text"
 756          *
 757          * @return String
 758          */
 759         public function getPageTitleActionText() {
 760                 if ( isset( $this->mPageTitleActionText ) ) {
 761                         return $this->mPageTitleActionText;
 762                 }
 763         }
 764
 765         /**
 766          * "HTML title" means the contents of <title>.
 767          * It is stored as plain, unescaped text and will be run through htmlspecialchars in the skin file.
 768          *
 769          * @param $name string
 770          */
 771         public function setHTMLTitle( $name ) {
 772                 if ( $name instanceof Message ) {
 773                         $this->mHTMLtitle = $name->setContext( $this->getContext() )->text();
 774                 } else {
 775                         $this->mHTMLtitle = $name;
 776                 }
 777         }
 778
 779         /**
 780          * Return the "HTML title", i.e. the content of the <title> tag.
 781          *
 782          * @return String
 783          */
 784         public function getHTMLTitle() {
 785                 return $this->mHTMLtitle;
 786         }
 787
 788         /**
 789          * Set $mRedirectedFrom, the Title of the page which redirected us to the current page.
 790          *
 791          * param @t Title
 792          */
 793         public function setRedirectedFrom( $t ) {
 794                 $this->mRedirectedFrom = $t;
 795         }
 796
 797         /**
 798          * "Page title" means the contents of \<h1\>. It is stored as a valid HTML fragment.
 799          * This function allows good tags like \<sup\> in the \<h1\> tag, but not bad tags like \<script\>.
 800          * This function automatically sets \<title\> to the same content as \<h1\> but with all tags removed.
 801          * Bad tags that were escaped in \<h1\> will still be escaped in \<title\>, and good tags like \<i\> will be dropped entirely.
 802          *
 803          * @param $name string|Message
 804          */
 805         public function setPageTitle( $name ) {
 806                 if ( $name instanceof Message ) {
 807                         $name = $name->setContext( $this->getContext() )->text();
 808                 }
 809
 810                 # change "<script>foo&bar</script>" to "&lt;script&gt;foo&amp;bar&lt;/script&gt;"
 811                 # but leave "<i>foobar</i>" alone
 812                 $nameWithTags = Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags( $name ) );
 813                 $this->mPagetitle = $nameWithTags;
 814
 815                 # change "<i>foo&amp;bar</i>" to "foo&bar"
 816                 $this->setHTMLTitle( $this->msg( 'pagetitle', Sanitizer::stripAllTags( $nameWithTags ) ) );
 817         }
 818
 819         /**
 820          * Return the "page title", i.e. the content of the \<h1\> tag.
 821          *
 822          * @return String
 823          */
 824         public function getPageTitle() {
 825                 return $this->mPagetitle;
 826         }
 827
 828         /**
 829          * Set the Title object to use
 830          *
 831          * @param $t Title object
 832          */
 833         public function setTitle( Title $t ) {
 834                 $this->getContext()->setTitle( $t );
 835         }
 836
 837
 838         /**
 839          * Replace the subtile with $str
 840          *
 841          * @param $str String|Message: new value of the subtitle
 842          */
 843         public function setSubtitle( $str ) {
 844                 $this->clearSubtitle();
 845                 $this->addSubtitle( $str );
 846         }
 847
 848         /**
 849          * Add $str to the subtitle
 850          *
 851          * @deprecated in 1.19; use addSubtitle() instead
 852          * @param $str String|Message to add to the subtitle
 853          */
 854         public function appendSubtitle( $str ) {
 855                 $this->addSubtitle( $str );
 856         }
 857
 858         /**
 859          * Add $str to the subtitle
 860          *
 861          * @param $str String|Message to add to the subtitle
 862          */
 863         public function addSubtitle( $str ) {
 864                 if ( $str instanceof Message ) {
 865                         $this->mSubtitle[] = $str->setContext( $this->getContext() )->parse();
 866                 } else {
 867                         $this->mSubtitle[] = $str;
 868                 }
 869         }
 870
 871         /**
 872          * Add a subtitle containing a backlink to a page
 873          *
 874          * @param $title Title to link to
 875          */
 876         public function addBacklinkSubtitle( Title $title ) {
 877                 $query = array();
 878                 if ( $title->isRedirect() ) {
 879                         $query['redirect'] = 'no';
 880                 }
 881                 $this->addSubtitle( $this->msg( 'backlinksubtitle' )->rawParams( Linker::link( $title, null, array(), $query ) ) );
 882         }
 883
 884         /**
 885          * Clear the subtitles
 886          */
 887         public function clearSubtitle() {
 888                 $this->mSubtitle = array();
 889         }
 890
 891         /**
 892          * Get the subtitle
 893          *
 894          * @return String
 895          */
 896         public function getSubtitle() {
 897                 return implode( "<br />\n\t\t\t\t", $this->mSubtitle );
 898         }
 899
 900         /**
 901          * Set the page as printable, i.e. it'll be displayed with with all
 902          * print styles included
 903          */
 904         public function setPrintable() {
 905                 $this->mPrintable = true;
 906         }
 907
 908         /**
 909          * Return whether the page is "printable"
 910          *
 911          * @return Boolean
 912          */
 913         public function isPrintable() {
 914                 return $this->mPrintable;
 915         }
 916
 917         /**
 918          * Disable output completely, i.e. calling output() will have no effect
 919          */
 920         public function disable() {
 921                 $this->mDoNothing = true;
 922         }
 923
 924         /**
 925          * Return whether the output will be completely disabled
 926          *
 927          * @return Boolean
 928          */
 929         public function isDisabled() {
 930                 return $this->mDoNothing;
 931         }
 932
 933         /**
 934          * Show an "add new section" link?
 935          *
 936          * @return Boolean
 937          */
 938         public function showNewSectionLink() {
 939                 return $this->mNewSectionLink;
 940         }
 941
 942         /**
 943          * Forcibly hide the new section link?
 944          *
 945          * @return Boolean
 946          */
 947         public function forceHideNewSectionLink() {
 948                 return $this->mHideNewSectionLink;
 949         }
 950
 951         /**
 952          * Add or remove feed links in the page header
 953          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
 954          * for the new version
 955          * @see addFeedLink()
 956          *
 957          * @param $show Boolean: true: add default feeds, false: remove all feeds
 958          */
 959         public function setSyndicated( $show = true ) {
 960                 if ( $show ) {
 961                         $this->setFeedAppendQuery( false );
 962                 } else {
 963                         $this->mFeedLinks = array();
 964                 }
 965         }
 966
 967         /**
 968          * Add default feeds to the page header
 969          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
 970          * for the new version
 971          * @see addFeedLink()
 972          *
 973          * @param $val String: query to append to feed links or false to output
 974          *        default links
 975          */
 976         public function setFeedAppendQuery( $val ) {
 977                 global $wgAdvertisedFeedTypes;
 978
 979                 $this->mFeedLinks = array();
 980
 981                 foreach ( $wgAdvertisedFeedTypes as $type ) {
 982                         $query = "feed=$type";
 983                         if ( is_string( $val ) ) {
 984                                 $query .= '&' . $val;
 985                         }
 986                         $this->mFeedLinks[$type] = $this->getTitle()->getLocalURL( $query );
 987                 }
 988         }
 989
 990         /**
 991          * Add a feed link to the page header
 992          *
 993          * @param $format String: feed type, should be a key of $wgFeedClasses
 994          * @param $href String: URL
 995          */
 996         public function addFeedLink( $format, $href ) {
 997                 global $wgAdvertisedFeedTypes;
 998
 999                 if ( in_array( $format, $wgAdvertisedFeedTypes ) ) {
1000                         $this->mFeedLinks[$format] = $href;
1001                 }
1002         }
1003
1004         /**
1005          * Should we output feed links for this page?
1006          * @return Boolean
1007          */
1008         public function isSyndicated() {
1009                 return count( $this->mFeedLinks ) > 0;
1010         }
1011
1012         /**
1013          * Return URLs for each supported syndication format for this page.
1014          * @return array associating format keys with URLs
1015          */
1016         public function getSyndicationLinks() {
1017                 return $this->mFeedLinks;
1018         }
1019
1020         /**
1021          * Will currently always return null
1022          *
1023          * @return null
1024          */
1025         public function getFeedAppendQuery() {
1026                 return $this->mFeedLinksAppendQuery;
1027         }
1028
1029         /**
1030          * Set whether the displayed content is related to the source of the
1031          * corresponding article on the wiki
1032          * Setting true will cause the change "article related" toggle to true
1033          *
1034          * @param $v Boolean
1035          */
1036         public function setArticleFlag( $v ) {
1037                 $this->mIsarticle = $v;
1038                 if ( $v ) {
1039                         $this->mIsArticleRelated = $v;
1040                 }
1041         }
1042
1043         /**
1044          * Return whether the content displayed page is related to the source of
1045          * the corresponding article on the wiki
1046          *
1047          * @return Boolean
1048          */
1049         public function isArticle() {
1050                 return $this->mIsarticle;
1051         }
1052
1053         /**
1054          * Set whether this page is related an article on the wiki
1055          * Setting false will cause the change of "article flag" toggle to false
1056          *
1057          * @param $v Boolean
1058          */
1059         public function setArticleRelated( $v ) {
1060                 $this->mIsArticleRelated = $v;
1061                 if ( !$v ) {
1062                         $this->mIsarticle = false;
1063                 }
1064         }
1065
1066         /**
1067          * Return whether this page is related an article on the wiki
1068          *
1069          * @return Boolean
1070          */
1071         public function isArticleRelated() {
1072                 return $this->mIsArticleRelated;
1073         }
1074
1075         /**
1076          * Add new language links
1077          *
1078          * @param $newLinkArray Associative array mapping language code to the page
1079          *                      name
1080          */
1081         public function addLanguageLinks( $newLinkArray ) {
1082                 $this->mLanguageLinks += $newLinkArray;
1083         }
1084
1085         /**
1086          * Reset the language links and add new language links
1087          *
1088          * @param $newLinkArray Associative array mapping language code to the page
1089          *                      name
1090          */
1091         public function setLanguageLinks( $newLinkArray ) {
1092                 $this->mLanguageLinks = $newLinkArray;
1093         }
1094
1095         /**
1096          * Get the list of language links
1097          *
1098          * @return Array of Interwiki Prefixed (non DB key) Titles (e.g. 'fr:Test page')
1099          */
1100         public function getLanguageLinks() {
1101                 return $this->mLanguageLinks;
1102         }
1103
1104         /**
1105          * Add an array of categories, with names in the keys
1106          *
1107          * @param $categories Array mapping category name => sort key
1108          */
1109         public function addCategoryLinks( $categories ) {
1110                 global $wgContLang;
1111
1112                 if ( !is_array( $categories ) || count( $categories ) == 0 ) {
1113                         return;
1114                 }
1115
1116                 # Add the links to a LinkBatch
1117                 $arr = array( NS_CATEGORY => $categories );
1118                 $lb = new LinkBatch;
1119                 $lb->setArray( $arr );
1120
1121                 # Fetch existence plus the hiddencat property
1122                 $dbr = wfGetDB( DB_SLAVE );
1123                 $res = $dbr->select( array( 'page', 'page_props' ),
1124                         array( 'page_id', 'page_namespace', 'page_title', 'page_len', 'page_is_redirect', 'page_latest', 'pp_value' ),
1125                         $lb->constructSet( 'page', $dbr ),
1126                         __METHOD__,
1127                         array(),
1128                         array( 'page_props' => array( 'LEFT JOIN', array( 'pp_propname' => 'hiddencat', 'pp_page = page_id' ) ) )
1129                 );
1130
1131                 # Add the results to the link cache
1132                 $lb->addResultToCache( LinkCache::singleton(), $res );
1133
1134                 # Set all the values to 'normal'. This can be done with array_fill_keys in PHP 5.2.0+
1135                 $categories = array_combine(
1136                         array_keys( $categories ),
1137                         array_fill( 0, count( $categories ), 'normal' )
1138                 );
1139
1140                 # Mark hidden categories
1141                 foreach ( $res as $row ) {
1142                         if ( isset( $row->pp_value ) ) {
1143                                 $categories[$row->page_title] = 'hidden';
1144                         }
1145                 }
1146
1147                 # Add the remaining categories to the skin
1148                 if ( wfRunHooks( 'OutputPageMakeCategoryLinks', array( &$this, $categories, &$this->mCategoryLinks ) ) ) {
1149                         foreach ( $categories as $category => $type ) {
1150                                 $origcategory = $category;
1151                                 $title = Title::makeTitleSafe( NS_CATEGORY, $category );
1152                                 $wgContLang->findVariantLink( $category, $title, true );
1153                                 if ( $category != $origcategory ) {
1154                                         if ( array_key_exists( $category, $categories ) ) {
1155                                                 continue;
1156                                         }
1157                                 }
1158                                 $text = $wgContLang->convertHtml( $title->getText() );
1159                                 $this->mCategories[] = $title->getText();
1160                                 $this->mCategoryLinks[$type][] = Linker::link( $title, $text );
1161                         }
1162                 }
1163         }
1164
1165         /**
1166          * Reset the category links (but not the category list) and add $categories
1167          *
1168          * @param $categories Array mapping category name => sort key
1169          */
1170         public function setCategoryLinks( $categories ) {
1171                 $this->mCategoryLinks = array();
1172                 $this->addCategoryLinks( $categories );
1173         }
1174
1175         /**
1176          * Get the list of category links, in a 2-D array with the following format:
1177          * $arr[$type][] = $link, where $type is either "normal" or "hidden" (for
1178          * hidden categories) and $link a HTML fragment with a link to the category
1179          * page
1180          *
1181          * @return Array
1182          */
1183         public function getCategoryLinks() {
1184                 return $this->mCategoryLinks;
1185         }
1186
1187         /**
1188          * Get the list of category names this page belongs to
1189          *
1190          * @return Array of strings
1191          */
1192         public function getCategories() {
1193                 return $this->mCategories;
1194         }
1195
1196         /**
1197          * Do not allow scripts which can be modified by wiki users to load on this page;
1198          * only allow scripts bundled with, or generated by, the software.
1199          */
1200         public function disallowUserJs() {
1201                 $this->reduceAllowedModules(
1202                         ResourceLoaderModule::TYPE_SCRIPTS,
1203                         ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL
1204                 );
1205         }
1206
1207         /**
1208          * Return whether user JavaScript is allowed for this page
1209          * @deprecated since 1.18 Load modules with ResourceLoader, and origin and
1210          *     trustworthiness is identified and enforced automagically.
1211          * @return Boolean
1212          */
1213         public function isUserJsAllowed() {
1214                 return $this->getAllowedModules( ResourceLoaderModule::TYPE_SCRIPTS ) >= ResourceLoaderModule::ORIGIN_USER_INDIVIDUAL;
1215         }
1216
1217         /**
1218          * Show what level of JavaScript / CSS untrustworthiness is allowed on this page
1219          * @see ResourceLoaderModule::$origin
1220          * @param $type String ResourceLoaderModule TYPE_ constant
1221          * @return Int ResourceLoaderModule ORIGIN_ class constant
1222          */
1223         public function getAllowedModules( $type ){
1224                 if( $type == ResourceLoaderModule::TYPE_COMBINED ){
1225                         return min( array_values( $this->mAllowedModules ) );
1226                 } else {
1227                         return isset( $this->mAllowedModules[$type] )
1228                                 ? $this->mAllowedModules[$type]
1229                                 : ResourceLoaderModule::ORIGIN_ALL;
1230                 }
1231         }
1232
1233         /**
1234          * Set the highest level of CSS/JS untrustworthiness allowed
1235          * @param  $type String ResourceLoaderModule TYPE_ constant
1236          * @param  $level Int ResourceLoaderModule class constant
1237          */
1238         public function setAllowedModules( $type, $level ){
1239                 $this->mAllowedModules[$type] = $level;
1240         }
1241
1242         /**
1243          * As for setAllowedModules(), but don't inadvertantly make the page more accessible
1244          * @param  $type String
1245          * @param  $level Int ResourceLoaderModule class constant
1246          */
1247         public function reduceAllowedModules( $type, $level ){
1248                 $this->mAllowedModules[$type] = min( $this->getAllowedModules($type), $level );
1249         }
1250
1251         /**
1252          * Prepend $text to the body HTML
1253          *
1254          * @param $text String: HTML
1255          */
1256         public function prependHTML( $text ) {
1257                 $this->mBodytext = $text . $this->mBodytext;
1258         }
1259
1260         /**
1261          * Append $text to the body HTML
1262          *
1263          * @param $text String: HTML
1264          */
1265         public function addHTML( $text ) {
1266                 $this->mBodytext .= $text;
1267         }
1268
1269         /**
1270          * Shortcut for adding an Html::element via addHTML.
1271          *
1272          * @since 1.19
1273          *
1274          * @param $element string
1275          * @param $attribs array
1276          * @param $contents string
1277          */
1278         public function addElement( $element, $attribs = array(), $contents = '' ) {
1279                 $this->addHTML( Html::element( $element, $attribs, $contents ) );
1280         }
1281
1282         /**
1283          * Clear the body HTML
1284          */
1285         public function clearHTML() {
1286                 $this->mBodytext = '';
1287         }
1288
1289         /**
1290          * Get the body HTML
1291          *
1292          * @return String: HTML
1293          */
1294         public function getHTML() {
1295                 return $this->mBodytext;
1296         }
1297
1298         /**
1299          * Add $text to the debug output
1300          *
1301          * @param $text String: debug text
1302          */
1303         public function debug( $text ) {
1304                 $this->mDebugtext .= $text;
1305         }
1306
1307         /**
1308          * Get/set the ParserOptions object to use for wikitext parsing
1309          *
1310          * @param $options either the ParserOption to use or null to only get the
1311          *                 current ParserOption object
1312          * @return ParserOptions object
1313          */
1314         public function parserOptions( $options = null ) {
1315                 if ( !$this->mParserOptions ) {
1316                         $this->mParserOptions = ParserOptions::newFromContext( $this->getContext() );
1317                         $this->mParserOptions->setEditSection( false );
1318                 }
1319                 return wfSetVar( $this->mParserOptions, $options );
1320         }
1321
1322         /**
1323          * Set the revision ID which will be seen by the wiki text parser
1324          * for things such as embedded {{REVISIONID}} variable use.
1325          *
1326          * @param $revid Mixed: an positive integer, or null
1327          * @return Mixed: previous value
1328          */
1329         public function setRevisionId( $revid ) {
1330                 $val = is_null( $revid ) ? null : intval( $revid );
1331                 return wfSetVar( $this->mRevisionId, $val );
1332         }
1333
1334         /**
1335          * Get the displayed revision ID
1336          *
1337          * @return Integer
1338          */
1339         public function getRevisionId() {
1340                 return $this->mRevisionId;
1341         }
1342
1343         /**
1344          * Set the timestamp of the revision which will be displayed. This is used
1345          * to avoid a extra DB call in Skin::lastModified().
1346          *
1347          * @param $revid Mixed: string, or null
1348          * @return Mixed: previous value
1349          */
1350         public function setRevisionTimestamp( $timestmap ) {
1351                 return wfSetVar( $this->mRevisionTimestamp, $timestmap );
1352         }
1353
1354         /**
1355          * Get the timestamp of displayed revision.
1356          * This will be null if not filled by setRevisionTimestamp().
1357          *
1358          * @return String or null
1359          */
1360         public function getRevisionTimestamp() {
1361                 return $this->mRevisionTimestamp;
1362         }
1363
1364         /**
1365          * Set the displayed file version
1366          *
1367          * @param $file File|false
1368          * @return Mixed: previous value
1369          */
1370         public function setFileVersion( $file ) {
1371                 $val = null;
1372                 if ( $file instanceof File && $file->exists() ) {
1373                         $val = array( 'time' => $file->getTimestamp(), 'sha1' => $file->getSha1() );
1374                 }
1375                 return wfSetVar( $this->mFileVersion, $val, true );
1376         }
1377
1378         /**
1379          * Get the displayed file version
1380          *
1381          * @return Array|null ('time' => MW timestamp, 'sha1' => sha1)
1382          */
1383         public function getFileVersion() {
1384                 return $this->mFileVersion;
1385         }
1386
1387         /**
1388          * Get the templates used on this page
1389          *
1390          * @return Array (namespace => dbKey => revId)
1391          * @since 1.18
1392          */
1393         public function getTemplateIds() {
1394                 return $this->mTemplateIds;
1395         }
1396
1397         /**
1398          * Get the files used on this page
1399          *
1400          * @return Array (dbKey => array('time' => MW timestamp or null, 'sha1' => sha1 or ''))
1401          * @since 1.18
1402          */
1403         public function getFileSearchOptions() {
1404                 return $this->mImageTimeKeys;
1405         }
1406
1407         /**
1408          * Convert wikitext to HTML and add it to the buffer
1409          * Default assumes that the current page title will be used.
1410          *
1411          * @param $text String
1412          * @param $linestart Boolean: is this the start of a line?
1413          * @param $interface Boolean: is this text in the user interface language?
1414          */
1415         public function addWikiText( $text, $linestart = true, $interface = true ) {
1416                 $title = $this->getTitle(); // Work arround E_STRICT
1417                 $this->addWikiTextTitle( $text, $title, $linestart, /*tidy*/false, $interface );
1418         }
1419
1420         /**
1421          * Add wikitext with a custom Title object
1422          *
1423          * @param $text String: wikitext
1424          * @param $title Title object
1425          * @param $linestart Boolean: is this the start of a line?
1426          */
1427         public function addWikiTextWithTitle( $text, &$title, $linestart = true ) {
1428                 $this->addWikiTextTitle( $text, $title, $linestart );
1429         }
1430
1431         /**
1432          * Add wikitext with a custom Title object and tidy enabled.
1433          *
1434          * @param $text String: wikitext
1435          * @param $title Title object
1436          * @param $linestart Boolean: is this the start of a line?
1437          */
1438         function addWikiTextTitleTidy( $text, &$title, $linestart = true ) {
1439                 $this->addWikiTextTitle( $text, $title, $linestart, true );
1440         }
1441
1442         /**
1443          * Add wikitext with tidy enabled
1444          *
1445          * @param $text String: wikitext
1446          * @param $linestart Boolean: is this the start of a line?
1447          */
1448         public function addWikiTextTidy( $text, $linestart = true ) {
1449                 $title = $this->getTitle();
1450                 $this->addWikiTextTitleTidy( $text, $title, $linestart );
1451         }
1452
1453         /**
1454          * Add wikitext with a custom Title object
1455          *
1456          * @param $text String: wikitext
1457          * @param $title Title object
1458          * @param $linestart Boolean: is this the start of a line?
1459          * @param $tidy Boolean: whether to use tidy
1460          * @param $interface Boolean: whether it is an interface message
1461          *                                                              (for example disables conversion)
1462          */
1463         public function addWikiTextTitle( $text, &$title, $linestart, $tidy = false, $interface = false ) {
1464                 global $wgParser;
1465
1466                 wfProfileIn( __METHOD__ );
1467
1468                 wfIncrStats( 'pcache_not_possible' );
1469
1470                 $popts = $this->parserOptions();
1471                 $oldTidy = $popts->setTidy( $tidy );
1472                 $popts->setInterfaceMessage( (bool) $interface );
1473
1474                 $parserOutput = $wgParser->parse(
1475                         $text, $title, $popts,
1476                         $linestart, true, $this->mRevisionId
1477                 );
1478
1479                 $popts->setTidy( $oldTidy );
1480
1481                 $this->addParserOutput( $parserOutput );
1482
1483                 wfProfileOut( __METHOD__ );
1484         }
1485
1486         /**
1487          * Add a ParserOutput object, but without Html
1488          *
1489          * @param $parserOutput ParserOutput object
1490          */
1491         public function addParserOutputNoText( &$parserOutput ) {
1492                 $this->mLanguageLinks += $parserOutput->getLanguageLinks();
1493                 $this->addCategoryLinks( $parserOutput->getCategories() );
1494                 $this->mNewSectionLink = $parserOutput->getNewSection();
1495                 $this->mHideNewSectionLink = $parserOutput->getHideNewSection();
1496
1497                 $this->mParseWarnings = $parserOutput->getWarnings();
1498                 if ( !$parserOutput->isCacheable() ) {
1499                         $this->enableClientCache( false );
1500                 }
1501                 $this->mNoGallery = $parserOutput->getNoGallery();
1502                 $this->mHeadItems = array_merge( $this->mHeadItems, $parserOutput->getHeadItems() );
1503                 $this->addModules( $parserOutput->getModules() );
1504                 $this->addModuleScripts( $parserOutput->getModuleScripts() );
1505                 $this->addModuleStyles( $parserOutput->getModuleStyles() );
1506                 $this->addModuleMessages( $parserOutput->getModuleMessages() );
1507
1508                 // Template versioning...
1509                 foreach ( (array)$parserOutput->getTemplateIds() as $ns => $dbks ) {
1510                         if ( isset( $this->mTemplateIds[$ns] ) ) {
1511                                 $this->mTemplateIds[$ns] = $dbks + $this->mTemplateIds[$ns];
1512                         } else {
1513                                 $this->mTemplateIds[$ns] = $dbks;
1514                         }
1515                 }
1516                 // File versioning...
1517                 foreach ( (array)$parserOutput->getFileSearchOptions() as $dbk => $data ) {
1518                         $this->mImageTimeKeys[$dbk] = $data;
1519                 }
1520
1521                 // Hooks registered in the object
1522                 global $wgParserOutputHooks;
1523                 foreach ( $parserOutput->getOutputHooks() as $hookInfo ) {
1524                         list( $hookName, $data ) = $hookInfo;
1525                         if ( isset( $wgParserOutputHooks[$hookName] ) ) {
1526                                 call_user_func( $wgParserOutputHooks[$hookName], $this, $parserOutput, $data );
1527                         }
1528                 }
1529
1530                 wfRunHooks( 'OutputPageParserOutput', array( &$this, $parserOutput ) );
1531         }
1532
1533         /**
1534          * Add a ParserOutput object
1535          *
1536          * @param $parserOutput ParserOutput
1537          */
1538         function addParserOutput( &$parserOutput ) {
1539                 $this->addParserOutputNoText( $parserOutput );
1540                 $text = $parserOutput->getText();
1541                 wfRunHooks( 'OutputPageBeforeHTML', array( &$this, &$text ) );
1542                 $this->addHTML( $text );
1543         }
1544
1545
1546         /**
1547          * Add the output of a QuickTemplate to the output buffer
1548          *
1549          * @param $template QuickTemplate
1550          */
1551         public function addTemplate( &$template ) {
1552                 ob_start();
1553                 $template->execute();
1554                 $this->addHTML( ob_get_contents() );
1555                 ob_end_clean();
1556         }
1557
1558         /**
1559          * Parse wikitext and return the HTML.
1560          *
1561          * @param $text String
1562          * @param $linestart Boolean: is this the start of a line?
1563          * @param $interface Boolean: use interface language ($wgLang instead of
1564          *                   $wgContLang) while parsing language sensitive magic
1565          *                   words like GRAMMAR and PLURAL. This also disables
1566          *                                       LanguageConverter.
1567          * @param $language  Language object: target language object, will override
1568          *                   $interface
1569          * @return String: HTML
1570          */
1571         public function parse( $text, $linestart = true, $interface = false, $language = null ) {
1572                 global $wgParser;
1573
1574                 if( is_null( $this->getTitle() ) ) {
1575                         throw new MWException( 'Empty $mTitle in ' . __METHOD__ );
1576                 }
1577
1578                 $popts = $this->parserOptions();
1579                 if ( $interface ) {
1580                         $popts->setInterfaceMessage( true );
1581                 }
1582                 if ( $language !== null ) {
1583                         $oldLang = $popts->setTargetLanguage( $language );
1584                 }
1585
1586                 $parserOutput = $wgParser->parse(
1587                         $text, $this->getTitle(), $popts,
1588                         $linestart, true, $this->mRevisionId
1589                 );
1590
1591                 if ( $interface ) {
1592                         $popts->setInterfaceMessage( false );
1593                 }
1594                 if ( $language !== null ) {
1595                         $popts->setTargetLanguage( $oldLang );
1596                 }
1597
1598                 return $parserOutput->getText();
1599         }
1600
1601         /**
1602          * Parse wikitext, strip paragraphs, and return the HTML.
1603          *
1604          * @param $text String
1605          * @param $linestart Boolean: is this the start of a line?
1606          * @param $interface Boolean: use interface language ($wgLang instead of
1607          *                   $wgContLang) while parsing language sensitive magic
1608          *                   words like GRAMMAR and PLURAL
1609          * @return String: HTML
1610          */
1611         public function parseInline( $text, $linestart = true, $interface = false ) {
1612                 $parsed = $this->parse( $text, $linestart, $interface );
1613
1614                 $m = array();
1615                 if ( preg_match( '/^<p>(.*)\n?<\/p>\n?/sU', $parsed, $m ) ) {
1616                         $parsed = $m[1];
1617                 }
1618
1619                 return $parsed;
1620         }
1621
1622         /**
1623          * Set the value of the "s-maxage" part of the "Cache-control" HTTP header
1624          *
1625          * @param $maxage Integer: maximum cache time on the Squid, in seconds.
1626          */
1627         public function setSquidMaxage( $maxage ) {
1628                 $this->mSquidMaxage = $maxage;
1629         }
1630
1631         /**
1632          * Use enableClientCache(false) to force it to send nocache headers
1633          *
1634          * @param $state bool
1635          *
1636          * @return bool
1637          */
1638         public function enableClientCache( $state ) {
1639                 return wfSetVar( $this->mEnableClientCache, $state );
1640         }
1641
1642         /**
1643          * Get the list of cookies that will influence on the cache
1644          *
1645          * @return Array
1646          */
1647         function getCacheVaryCookies() {
1648                 global $wgCookiePrefix, $wgCacheVaryCookies;
1649                 static $cookies;
1650                 if ( $cookies === null ) {
1651                         $cookies = array_merge(
1652                                 array(
1653                                         "{$wgCookiePrefix}Token",
1654                                         "{$wgCookiePrefix}LoggedOut",
1655                                         session_name()
1656                                 ),
1657                                 $wgCacheVaryCookies
1658                         );
1659                         wfRunHooks( 'GetCacheVaryCookies', array( $this, &$cookies ) );
1660                 }
1661                 return $cookies;
1662         }
1663
1664         /**
1665          * Return whether this page is not cacheable because "useskin" or "uselang"
1666          * URL parameters were passed.
1667          *
1668          * @return Boolean
1669          */
1670         function uncacheableBecauseRequestVars() {
1671                 $request = $this->getRequest();
1672                 return $request->getText( 'useskin', false ) === false
1673                         && $request->getText( 'uselang', false ) === false;
1674         }
1675
1676         /**
1677          * Check if the request has a cache-varying cookie header
1678          * If it does, it's very important that we don't allow public caching
1679          *
1680          * @return Boolean
1681          */
1682         function haveCacheVaryCookies() {
1683                 $cookieHeader = $this->getRequest()->getHeader( 'cookie' );
1684                 if ( $cookieHeader === false ) {
1685                         return false;
1686                 }
1687                 $cvCookies = $this->getCacheVaryCookies();
1688                 foreach ( $cvCookies as $cookieName ) {
1689                         # Check for a simple string match, like the way squid does it
1690                         if ( strpos( $cookieHeader, $cookieName ) !== false ) {
1691                                 wfDebug( __METHOD__ . ": found $cookieName\n" );
1692                                 return true;
1693                         }
1694                 }
1695                 wfDebug( __METHOD__ . ": no cache-varying cookies found\n" );
1696                 return false;
1697         }
1698
1699         /**
1700          * Add an HTTP header that will influence on the cache
1701          *
1702          * @param $header String: header name
1703          * @param $option Array|null
1704          * @todo FIXME: Document the $option parameter; it appears to be for
1705          *        X-Vary-Options but what format is acceptable?
1706          */
1707         public function addVaryHeader( $header, $option = null ) {
1708                 if ( !array_key_exists( $header, $this->mVaryHeader ) ) {
1709                         $this->mVaryHeader[$header] = (array)$option;
1710                 } elseif( is_array( $option ) ) {
1711                         if( is_array( $this->mVaryHeader[$header] ) ) {
1712                                 $this->mVaryHeader[$header] = array_merge( $this->mVaryHeader[$header], $option );
1713                         } else {
1714                                 $this->mVaryHeader[$header] = $option;
1715                         }
1716                 }
1717                 $this->mVaryHeader[$header] = array_unique( (array)$this->mVaryHeader[$header] );
1718         }
1719
1720         /**
1721          * Get a complete X-Vary-Options header
1722          *
1723          * @return String
1724          */
1725         public function getXVO() {
1726                 $cvCookies = $this->getCacheVaryCookies();
1727
1728                 $cookiesOption = array();
1729                 foreach ( $cvCookies as $cookieName ) {
1730                         $cookiesOption[] = 'string-contains=' . $cookieName;
1731                 }
1732                 $this->addVaryHeader( 'Cookie', $cookiesOption );
1733
1734                 $headers = array();
1735                 foreach( $this->mVaryHeader as $header => $option ) {
1736                         $newheader = $header;
1737                         if( is_array( $option ) ) {
1738                                 $newheader .= ';' . implode( ';', $option );
1739                         }
1740                         $headers[] = $newheader;
1741                 }
1742                 $xvo = 'X-Vary-Options: ' . implode( ',', $headers );
1743
1744                 return $xvo;
1745         }
1746
1747         /**
1748          * bug 21672: Add Accept-Language to Vary and XVO headers
1749          * if there's no 'variant' parameter existed in GET.
1750          *
1751          * For example:
1752          *   /w/index.php?title=Main_page should always be served; but
1753          *   /w/index.php?title=Main_page&variant=zh-cn should never be served.
1754          */
1755         function addAcceptLanguage() {
1756                 $lang = $this->getTitle()->getPageLanguage();
1757                 if( !$this->getRequest()->getCheck( 'variant' ) && $lang->hasVariants() ) {
1758                         $variants = $lang->getVariants();
1759                         $aloption = array();
1760                         foreach ( $variants as $variant ) {
1761                                 if( $variant === $lang->getCode() ) {
1762                                         continue;
1763                                 } else {
1764                                         $aloption[] = 'string-contains=' . $variant;
1765
1766                                         // IE and some other browsers use another form of language code
1767                                         // in their Accept-Language header, like "zh-CN" or "zh-TW".
1768                                         // We should handle these too.
1769                                         $ievariant = explode( '-', $variant );
1770                                         if ( count( $ievariant ) == 2 ) {
1771                                                 $ievariant[1] = strtoupper( $ievariant[1] );
1772                                                 $ievariant = implode( '-', $ievariant );
1773                                                 $aloption[] = 'string-contains=' . $ievariant;
1774                                         }
1775                                 }
1776                         }
1777                         $this->addVaryHeader( 'Accept-Language', $aloption );
1778                 }
1779         }
1780
1781         /**
1782          * Set a flag which will cause an X-Frame-Options header appropriate for
1783          * edit pages to be sent. The header value is controlled by
1784          * $wgEditPageFrameOptions.
1785          *
1786          * This is the default for special pages. If you display a CSRF-protected
1787          * form on an ordinary view page, then you need to call this function.
1788          *
1789          * @param $enable bool
1790          */
1791         public function preventClickjacking( $enable = true ) {
1792                 $this->mPreventClickjacking = $enable;
1793         }
1794
1795         /**
1796          * Turn off frame-breaking. Alias for $this->preventClickjacking(false).
1797          * This can be called from pages which do not contain any CSRF-protected
1798          * HTML form.
1799          */
1800         public function allowClickjacking() {
1801                 $this->mPreventClickjacking = false;
1802         }
1803
1804         /**
1805          * Get the X-Frame-Options header value (without the name part), or false
1806          * if there isn't one. This is used by Skin to determine whether to enable
1807          * JavaScript frame-breaking, for clients that don't support X-Frame-Options.
1808          *
1809          * @return string
1810          */
1811         public function getFrameOptions() {
1812                 global $wgBreakFrames, $wgEditPageFrameOptions;
1813                 if ( $wgBreakFrames ) {
1814                         return 'DENY';
1815                 } elseif ( $this->mPreventClickjacking && $wgEditPageFrameOptions ) {
1816                         return $wgEditPageFrameOptions;
1817                 }
1818                 return false;
1819         }
1820
1821         /**
1822          * Send cache control HTTP headers
1823          */
1824         public function sendCacheControl() {
1825                 global $wgUseSquid, $wgUseESI, $wgUseETag, $wgSquidMaxage, $wgUseXVO;
1826
1827                 $response = $this->getRequest()->response();
1828                 if ( $wgUseETag && $this->mETag ) {
1829                         $response->header( "ETag: $this->mETag" );
1830                 }
1831
1832                 $this->addAcceptLanguage();
1833
1834                 # don't serve compressed data to clients who can't handle it
1835                 # maintain different caches for logged-in users and non-logged in ones
1836                 $response->header( 'Vary: ' . join( ', ', array_keys( $this->mVaryHeader ) ) );
1837
1838                 if ( $wgUseXVO ) {
1839                         # Add an X-Vary-Options header for Squid with Wikimedia patches
1840                         $response->header( $this->getXVO() );
1841                 }
1842
1843                 if( !$this->uncacheableBecauseRequestVars() && $this->mEnableClientCache ) {
1844                         if(
1845                                 $wgUseSquid && session_id() == '' && !$this->isPrintable() &&
1846                                 $this->mSquidMaxage != 0 && !$this->haveCacheVaryCookies()
1847                         )
1848                         {
1849                                 if ( $wgUseESI ) {
1850                                         # We'll purge the proxy cache explicitly, but require end user agents
1851                                         # to revalidate against the proxy on each visit.
1852                                         # Surrogate-Control controls our Squid, Cache-Control downstream caches
1853                                         wfDebug( __METHOD__ . ": proxy caching with ESI; {$this->mLastModified} **\n", false );
1854                                         # start with a shorter timeout for initial testing
1855                                         # header( 'Surrogate-Control: max-age=2678400+2678400, content="ESI/1.0"');
1856                                         $response->header( 'Surrogate-Control: max-age='.$wgSquidMaxage.'+'.$this->mSquidMaxage.', content="ESI/1.0"');
1857                                         $response->header( 'Cache-Control: s-maxage=0, must-revalidate, max-age=0' );
1858                                 } else {
1859                                         # We'll purge the proxy cache for anons explicitly, but require end user agents
1860                                         # to revalidate against the proxy on each visit.
1861                                         # IMPORTANT! The Squid needs to replace the Cache-Control header with
1862                                         # Cache-Control: s-maxage=0, must-revalidate, max-age=0
1863                                         wfDebug( __METHOD__ . ": local proxy caching; {$this->mLastModified} **\n", false );
1864                                         # start with a shorter timeout for initial testing
1865                                         # header( "Cache-Control: s-maxage=2678400, must-revalidate, max-age=0" );
1866                                         $response->header( 'Cache-Control: s-maxage='.$this->mSquidMaxage.', must-revalidate, max-age=0' );
1867                                 }
1868                         } else {
1869                                 # We do want clients to cache if they can, but they *must* check for updates
1870                                 # on revisiting the page.
1871                                 wfDebug( __METHOD__ . ": private caching; {$this->mLastModified} **\n", false );
1872                                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1873                                 $response->header( "Cache-Control: private, must-revalidate, max-age=0" );
1874                         }
1875                         if($this->mLastModified) {
1876                                 $response->header( "Last-Modified: {$this->mLastModified}" );
1877                         }
1878                 } else {
1879                         wfDebug( __METHOD__ . ": no caching **\n", false );
1880
1881                         # In general, the absence of a last modified header should be enough to prevent
1882                         # the client from using its cache. We send a few other things just to make sure.
1883                         $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1884                         $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
1885                         $response->header( 'Pragma: no-cache' );
1886                 }
1887         }
1888
1889         /**
1890          * Get the message associed with the HTTP response code $code
1891          *
1892          * @param $code Integer: status code
1893          * @return String or null: message or null if $code is not in the list of
1894          *         messages
1895          *
1896          * @deprecated since 1.18 Use HttpStatus::getMessage() instead.
1897          */
1898         public static function getStatusMessage( $code ) {
1899                 wfDeprecated( __METHOD__ );
1900                 return HttpStatus::getMessage( $code );
1901         }
1902
1903         /**
1904          * Finally, all the text has been munged and accumulated into
1905          * the object, let's actually output it:
1906          */
1907         public function output() {
1908                 global $wgLanguageCode, $wgDebugRedirects, $wgMimeType, $wgVaryOnXFP;
1909
1910                 if( $this->mDoNothing ) {
1911                         return;
1912                 }
1913
1914                 wfProfileIn( __METHOD__ );
1915
1916                 $response = $this->getRequest()->response();
1917
1918                 if ( $this->mRedirect != '' ) {
1919                         # Standards require redirect URLs to be absolute
1920                         $this->mRedirect = wfExpandUrl( $this->mRedirect, PROTO_CURRENT );
1921                         if( $this->mRedirectCode == '301' || $this->mRedirectCode == '303' ) {
1922                                 if( !$wgDebugRedirects ) {
1923                                         $message = HttpStatus::getMessage( $this->mRedirectCode );
1924                                         $response->header( "HTTP/1.1 {$this->mRedirectCode} $message" );
1925                                 }
1926                                 $this->mLastModified = wfTimestamp( TS_RFC2822 );
1927                         }
1928                         if ( $wgVaryOnXFP ) {
1929                                 $this->addVaryHeader( 'X-Forwarded-Proto' );
1930                         }
1931                         $this->sendCacheControl();
1932
1933                         $response->header( "Content-Type: text/html; charset=utf-8" );
1934                         if( $wgDebugRedirects ) {
1935                                 $url = htmlspecialchars( $this->mRedirect );
1936                                 print "<html>\n<head>\n<title>Redirect</title>\n</head>\n<body>\n";
1937                                 print "<p>Location: <a href=\"$url\">$url</a></p>\n";
1938                                 print "</body>\n</html>\n";
1939                         } else {
1940                                 $response->header( 'Location: ' . $this->mRedirect );
1941                         }
1942                         wfProfileOut( __METHOD__ );
1943                         return;
1944                 } elseif ( $this->mStatusCode ) {
1945                         $message = HttpStatus::getMessage( $this->mStatusCode );
1946                         if ( $message ) {
1947                                 $response->header( 'HTTP/1.1 ' . $this->mStatusCode . ' ' . $message );
1948                         }
1949                 }
1950
1951                 # Buffer output; final headers may depend on later processing
1952                 ob_start();
1953
1954                 $response->header( "Content-type: $wgMimeType; charset=UTF-8" );
1955                 $response->header( 'Content-language: ' . $wgLanguageCode );
1956
1957                 // Prevent framing, if requested
1958                 $frameOptions = $this->getFrameOptions();
1959                 if ( $frameOptions ) {
1960                         $response->header( "X-Frame-Options: $frameOptions" );
1961                 }
1962
1963                 if ( $this->mArticleBodyOnly ) {
1964                         $this->out( $this->mBodytext );
1965                 } else {
1966                         $this->addDefaultModules();
1967
1968                         $sk = $this->getSkin();
1969
1970                         // Hook that allows last minute changes to the output page, e.g.
1971                         // adding of CSS or Javascript by extensions.
1972                         wfRunHooks( 'BeforePageDisplay', array( &$this, &$sk ) );
1973
1974                         wfProfileIn( 'Output-skin' );
1975                         $sk->outputPage();
1976                         wfProfileOut( 'Output-skin' );
1977                 }
1978
1979                 $this->sendCacheControl();
1980                 ob_end_flush();
1981                 wfProfileOut( __METHOD__ );
1982         }
1983
1984         /**
1985          * Actually output something with print().
1986          *
1987          * @param $ins String: the string to output
1988          */
1989         public function out( $ins ) {
1990                 print $ins;
1991         }
1992
1993         /**
1994          * Produce a "user is blocked" page.
1995          * @deprecated since 1.18
1996          */
1997         function blockedPage() {
1998                 throw new UserBlockedError( $this->getUser()->mBlock );
1999         }
2000
2001         /**
2002          * Prepare this object to display an error page; disable caching and
2003          * indexing, clear the current text and redirect, set the page's title
2004          * and optionally an custom HTML title (content of the <title> tag).
2005          *
2006          * @param $pageTitle String|Message will be passed directly to setPageTitle()
2007          * @param $htmlTitle String|Message will be passed directly to setHTMLTitle();
2008          *                   optional, if not passed the <title> attribute will be
2009          *                   based on $pageTitle
2010          */
2011         public function prepareErrorPage( $pageTitle, $htmlTitle = false ) {
2012                 if ( $this->getTitle() ) {
2013                         $this->mDebugtext .= 'Original title: ' . $this->getTitle()->getPrefixedText() . "\n";
2014                 }
2015
2016                 $this->setPageTitle( $pageTitle );
2017                 if ( $htmlTitle !== false ) {
2018                         $this->setHTMLTitle( $htmlTitle );
2019                 }
2020                 $this->setRobotPolicy( 'noindex,nofollow' );
2021                 $this->setArticleRelated( false );
2022                 $this->enableClientCache( false );
2023                 $this->mRedirect = '';
2024                 $this->clearSubtitle();
2025                 $this->clearHTML();
2026         }
2027
2028         /**
2029          * Output a standard error page
2030          *
2031          * showErrorPage( 'titlemsg', 'pagetextmsg', array( 'param1', 'param2' ) );
2032          * showErrorPage( 'titlemsg', $messageObject );
2033          *
2034          * @param $title String: message key for page title
2035          * @param $msg Mixed: message key (string) for page text, or a Message object
2036          * @param $params Array: message parameters; ignored if $msg is a Message object
2037          */
2038         public function showErrorPage( $title, $msg, $params = array() ) {
2039                 $this->prepareErrorPage( $this->msg( $title ), $this->msg( 'errorpagetitle' ) );
2040
2041                 if ( $msg instanceof Message ){
2042                         $this->addHTML( $msg->parse() );
2043                 } else {
2044                         $this->addWikiMsgArray( $msg, $params );
2045                 }
2046
2047                 $this->returnToMain();
2048         }
2049
2050         /**
2051          * Output a standard permission error page
2052          *
2053          * @param $errors Array: error message keys
2054          * @param $action String: action that was denied or null if unknown
2055          */
2056         public function showPermissionsErrorPage( $errors, $action = null ) {
2057                 global $wgGroupPermissions;
2058
2059                 // For some action (read, edit, create and upload), display a "login to do this action"
2060                 // error if all of the following conditions are met:
2061                 // 1. the user is not logged in
2062                 // 2. the only error is insufficient permissions (i.e. no block or something else)
2063                 // 3. the error can be avoided simply by logging in
2064                 if ( in_array( $action, array( 'read', 'edit', 'createpage', 'createtalk', 'upload' ) )
2065                         && $this->getUser()->isAnon() && count( $errors ) == 1 && isset( $errors[0][0] )
2066                         && ( $errors[0][0] == 'badaccess-groups' || $errors[0][0] == 'badaccess-group0' )
2067                         && ( ( isset( $wgGroupPermissions['user'][$action] ) && $wgGroupPermissions['user'][$action] )
2068                         || ( isset( $wgGroupPermissions['autoconfirmed'][$action] ) && $wgGroupPermissions['autoconfirmed'][$action] ) )
2069                 ) {
2070                         $displayReturnto = null;
2071
2072                         # Due to bug 32276, if a user does not have read permissions,
2073                         # $this->getTitle() will just give Special:Badtitle, which is
2074                         # not especially useful as a returnto parameter. Use the title
2075                         # from the request instead, if there was one.
2076                         $request = $this->getRequest();
2077                         $returnto = Title::newFromURL( $request->getVal( 'title', '' ) );
2078                         if ( $action == 'edit' ) {
2079                                 $msg = 'whitelistedittext';
2080                                 $displayReturnto = $returnto;
2081                         } elseif ( $action == 'createpage' || $action == 'createtalk' ) {
2082                                 $msg = 'nocreatetext';
2083                         } elseif ( $action == 'upload' ) {
2084                                 $msg = 'uploadnologintext';
2085                         } else { # Read
2086                                 $msg = 'loginreqpagetext';
2087                                 $displayReturnto = Title::newMainPage();
2088                         }
2089
2090                         $query = array();
2091
2092                         if ( $returnto ) {
2093                                 $query['returnto'] = $returnto->getPrefixedText();
2094
2095                                 if ( !$request->wasPosted() ) {
2096                                         $returntoquery = $request->getValues();
2097                                         unset( $returntoquery['title'] );
2098                                         unset( $returntoquery['returnto'] );
2099                                         unset( $returntoquery['returntoquery'] );
2100                                         $query['returntoquery'] = wfArrayToCGI( $returntoquery );
2101                                 }
2102                         }
2103                         $loginLink = Linker::linkKnown(
2104                                 SpecialPage::getTitleFor( 'Userlogin' ),
2105                                 $this->msg( 'loginreqlink' )->escaped(),
2106                                 array(),
2107                                 $query
2108                         );
2109
2110                         $this->prepareErrorPage( $this->msg( 'loginreqtitle' ) );
2111                         $this->addHTML( $this->msg( $msg )->rawParams( $loginLink )->parse() );
2112
2113                         # Don't return to a page the user can't read otherwise
2114                         # we'll end up in a pointless loop
2115                         if ( $displayReturnto && $displayReturnto->userCan( 'read' ) ) {
2116                                 $this->returnToMain( null, $displayReturnto );
2117                         }
2118                 } else {
2119                         $this->prepareErrorPage( $this->msg( 'permissionserrors' ) );
2120                         $this->addWikiText( $this->formatPermissionsErrorMessage( $errors, $action ) );
2121                 }
2122         }
2123
2124         /**
2125          * Display an error page indicating that a given version of MediaWiki is
2126          * required to use it
2127          *
2128          * @param $version Mixed: the version of MediaWiki needed to use the page
2129          */
2130         public function versionRequired( $version ) {
2131                 $this->prepareErrorPage( $this->msg( 'versionrequired', $version ) );
2132
2133                 $this->addWikiMsg( 'versionrequiredtext', $version );
2134                 $this->returnToMain();
2135         }
2136
2137         /**
2138          * Display an error page noting that a given permission bit is required.
2139          * @deprecated since 1.18, just throw the exception directly
2140          * @param $permission String: key required
2141          */
2142         public function permissionRequired( $permission ) {
2143                 throw new PermissionsError( $permission );
2144         }
2145
2146         /**
2147          * Produce the stock "please login to use the wiki" page
2148          *
2149          * @deprecated in 1.19; throw the exception directly
2150          */
2151         public function loginToUse() {
2152                 throw new PermissionsError( 'read' );
2153         }
2154
2155         /**
2156          * Format a list of error messages
2157          *
2158          * @param $errors Array of arrays returned by Title::getUserPermissionsErrors
2159          * @param $action String: action that was denied or null if unknown
2160          * @return String: the wikitext error-messages, formatted into a list.
2161          */
2162         public function formatPermissionsErrorMessage( $errors, $action = null ) {
2163                 if ( $action == null ) {
2164                         $text = $this->msg( 'permissionserrorstext', count( $errors ) )->plain() . "\n\n";
2165                 } else {
2166                         $action_desc = $this->msg( "action-$action" )->plain();
2167                         $text = $this->msg(
2168                                 'permissionserrorstext-withaction',
2169                                 count( $errors ),
2170                                 $action_desc
2171                         )->plain() . "\n\n";
2172                 }
2173
2174                 if ( count( $errors ) > 1 ) {
2175                         $text .= '<ul class="permissions-errors">' . "\n";
2176
2177                         foreach( $errors as $error ) {
2178                                 $text .= '<li>';
2179                                 $text .= call_user_func_array( array( $this, 'msg' ), $error )->plain();
2180                                 $text .= "</li>\n";
2181                         }
2182                         $text .= '</ul>';
2183                 } else {
2184                         $text .= "<div class=\"permissions-errors\">\n" .
2185                                         call_user_func_array( array( $this, 'msg' ), reset( $errors ) )->plain() .
2186                                         "\n</div>";
2187                 }
2188
2189                 return $text;
2190         }
2191
2192         /**
2193          * Display a page stating that the Wiki is in read-only mode,
2194          * and optionally show the source of the page that the user
2195          * was trying to edit.  Should only be called (for this
2196          * purpose) after wfReadOnly() has returned true.
2197          *
2198          * For historical reasons, this function is _also_ used to
2199          * show the error message when a user tries to edit a page
2200          * they are not allowed to edit.  (Unless it's because they're
2201          * blocked, then we show blockedPage() instead.)  In this
2202          * case, the second parameter should be set to true and a list
2203          * of reasons supplied as the third parameter.
2204          *
2205          * @todo Needs to be split into multiple functions.
2206          *
2207          * @param $source    String: source code to show (or null).
2208          * @param $protected Boolean: is this a permissions error?
2209          * @param $reasons   Array: list of reasons for this error, as returned by Title::getUserPermissionsErrors().
2210          * @param $action    String: action that was denied or null if unknown
2211          */
2212         public function readOnlyPage( $source = null, $protected = false, $reasons = array(), $action = null ) {
2213                 $this->setRobotPolicy( 'noindex,nofollow' );
2214                 $this->setArticleRelated( false );
2215
2216                 // If no reason is given, just supply a default "I can't let you do
2217                 // that, Dave" message.  Should only occur if called by legacy code.
2218                 if ( $protected && empty( $reasons ) ) {
2219                         $reasons[] = array( 'badaccess-group0' );
2220                 }
2221
2222                 if ( !empty( $reasons ) ) {
2223                         // Permissions error
2224                         if( $source ) {
2225                                 $this->setPageTitle( $this->msg( 'viewsource-title', $this->getTitle()->getPrefixedText() ) );
2226                                 $this->addBacklinkSubtitle( $this->getTitle() );
2227                         } else {
2228                                 $this->setPageTitle( $this->msg( 'badaccess' ) );
2229                         }
2230                         $this->addWikiText( $this->formatPermissionsErrorMessage( $reasons, $action ) );
2231                 } else {
2232                         // Wiki is read only
2233                         throw new ReadOnlyError;
2234                 }
2235
2236                 // Show source, if supplied
2237                 if( is_string( $source ) ) {
2238                         $this->addWikiMsg( 'viewsourcetext' );
2239
2240                         $pageLang = $this->getTitle()->getPageLanguage();
2241                         $params = array(
2242                                 'id'   => 'wpTextbox1',
2243                                 'name' => 'wpTextbox1',
2244                                 'cols' => $this->getUser()->getOption( 'cols' ),
2245                                 'rows' => $this->getUser()->getOption( 'rows' ),
2246                                 'readonly' => 'readonly',
2247                                 'lang' => $pageLang->getHtmlCode(),
2248                                 'dir' => $pageLang->getDir(),
2249                         );
2250                         $this->addHTML( Html::element( 'textarea', $params, $source ) );
2251
2252                         // Show templates used by this article
2253                         $page = WikiPage::factory( $this->getTitle() );
2254                         $templates = Linker::formatTemplates( $page->getUsedTemplates() );
2255                         $this->addHTML( "<div class='templatesUsed'>
2256 $templates
2257 </div>
2258 " );
2259                 }
2260
2261                 # If the title doesn't exist, it's fairly pointless to print a return
2262                 # link to it.  After all, you just tried editing it and couldn't, so
2263                 # what's there to do there?
2264                 if( $this->getTitle()->exists() ) {
2265                         $this->returnToMain( null, $this->getTitle() );
2266                 }
2267         }
2268
2269         /**
2270          * Turn off regular page output and return an error reponse
2271          * for when rate limiting has triggered.
2272          */
2273         public function rateLimited() {
2274                 throw new ThrottledError;
2275         }
2276
2277         /**
2278          * Show a warning about slave lag
2279          *
2280          * If the lag is higher than $wgSlaveLagCritical seconds,
2281          * then the warning is a bit more obvious. If the lag is
2282          * lower than $wgSlaveLagWarning, then no warning is shown.
2283          *
2284          * @param $lag Integer: slave lag
2285          */
2286         public function showLagWarning( $lag ) {
2287                 global $wgSlaveLagWarning, $wgSlaveLagCritical;
2288                 if( $lag >= $wgSlaveLagWarning ) {
2289                         $message = $lag < $wgSlaveLagCritical
2290                                 ? 'lag-warn-normal'
2291                                 : 'lag-warn-high';
2292                         $wrap = Html::rawElement( 'div', array( 'class' => "mw-{$message}" ), "\n$1\n" );
2293                         $this->wrapWikiMsg( "$wrap\n", array( $message, $this->getLanguage()->formatNum( $lag ) ) );
2294                 }
2295         }
2296
2297         public function showFatalError( $message ) {
2298                 $this->prepareErrorPage( $this->msg( 'internalerror' ) );
2299
2300                 $this->addHTML( $message );
2301         }
2302
2303         public function showUnexpectedValueError( $name, $val ) {
2304                 $this->showFatalError( $this->msg( 'unexpected', $name, $val )->text() );
2305         }
2306
2307         public function showFileCopyError( $old, $new ) {
2308                 $this->showFatalError( $this->msg( 'filecopyerror', $old, $new )->text() );
2309         }
2310
2311         public function showFileRenameError( $old, $new ) {
2312                 $this->showFatalError( $this->msg( 'filerenameerror', $old, $new )->text() );
2313         }
2314
2315         public function showFileDeleteError( $name ) {
2316                 $this->showFatalError( $this->msg( 'filedeleteerror', $name )->text() );
2317         }
2318
2319         public function showFileNotFoundError( $name ) {
2320                 $this->showFatalError( $this->msg( 'filenotfound', $name )->text() );
2321         }
2322
2323         /**
2324          * Add a "return to" link pointing to a specified title
2325          *
2326          * @param $title Title to link
2327          * @param $query String query string
2328          * @param $text String text of the link (input is not escaped)
2329          */
2330         public function addReturnTo( $title, $query = array(), $text = null ) {
2331                 $this->addLink( array( 'rel' => 'next', 'href' => $title->getFullURL() ) );
2332                 $link = $this->msg( 'returnto' )->rawParams(
2333                         Linker::link( $title, $text, array(), $query ) )->escaped();
2334                 $this->addHTML( "<p id=\"mw-returnto\">{$link}</p>\n" );
2335         }
2336
2337         /**
2338          * Add a "return to" link pointing to a specified title,
2339          * or the title indicated in the request, or else the main page
2340          *
2341          * @param $unused No longer used
2342          * @param $returnto Title or String to return to
2343          * @param $returntoquery String: query string for the return to link
2344          */
2345         public function returnToMain( $unused = null, $returnto = null, $returntoquery = null ) {
2346                 if ( $returnto == null ) {
2347                         $returnto = $this->getRequest()->getText( 'returnto' );
2348                 }
2349
2350                 if ( $returntoquery == null ) {
2351                         $returntoquery = $this->getRequest()->getText( 'returntoquery' );
2352                 }
2353
2354                 if ( $returnto === '' ) {
2355                         $returnto = Title::newMainPage();
2356                 }
2357
2358                 if ( is_object( $returnto ) ) {
2359                         $titleObj = $returnto;
2360                 } else {
2361                         $titleObj = Title::newFromText( $returnto );
2362                 }
2363                 if ( !is_object( $titleObj ) ) {
2364                         $titleObj = Title::newMainPage();
2365                 }
2366
2367                 $this->addReturnTo( $titleObj, $returntoquery );
2368         }
2369
2370         /**
2371          * @param $sk Skin The given Skin
2372          * @param $includeStyle Boolean: unused
2373          * @return String: The doctype, opening <html>, and head element.
2374          */
2375         public function headElement( Skin $sk, $includeStyle = true ) {
2376                 global $wgContLang;
2377                 $userdir = $this->getLanguage()->getDir();
2378                 $sitedir = $wgContLang->getDir();
2379
2380                 if ( $sk->commonPrintStylesheet() ) {
2381                         $this->addModuleStyles( 'mediawiki.legacy.wikiprintable' );
2382                 }
2383
2384                 $ret = Html::htmlHeader( array( 'lang' => $this->getLanguage()->getHtmlCode(), 'dir' => $userdir, 'class' => 'client-nojs' ) );
2385
2386                 if ( $this->getHTMLTitle() == '' ) {
2387                         $this->setHTMLTitle( $this->msg( 'pagetitle', $this->getPageTitle() ) );
2388                 }
2389
2390                 $openHead = Html::openElement( 'head' );
2391                 if ( $openHead ) {
2392                         # Don't bother with the newline if $head == ''
2393                         $ret .= "$openHead\n";
2394                 }
2395
2396                 $ret .= Html::element( 'title', null, $this->getHTMLTitle() ) . "\n";
2397
2398                 $ret .= implode( "\n", array(
2399                         $this->getHeadLinks( null, true ),
2400                         $this->buildCssLinks(),
2401                         $this->getHeadScripts(),
2402                         $this->getHeadItems()
2403                 ) );
2404
2405                 $closeHead = Html::closeElement( 'head' );
2406                 if ( $closeHead ) {
2407                         $ret .= "$closeHead\n";
2408                 }
2409
2410                 $bodyAttrs = array();
2411
2412                 # Classes for LTR/RTL directionality support
2413                 $bodyAttrs['class'] = "mediawiki $userdir sitedir-$sitedir";
2414
2415                 if ( $this->getLanguage()->capitalizeAllNouns() ) {
2416                         # A <body> class is probably not the best way to do this . . .
2417                         $bodyAttrs['class'] .= ' capitalize-all-nouns';
2418                 }
2419                 $bodyAttrs['class'] .= ' ' . $sk->getPageClasses( $this->getTitle() );
2420                 $bodyAttrs['class'] .= ' skin-' . Sanitizer::escapeClass( $sk->getSkinName() );
2421
2422                 $sk->addToBodyAttributes( $this, $bodyAttrs ); // Allow skins to add body attributes they need
2423                 wfRunHooks( 'OutputPageBodyAttributes', array( $this, $sk, &$bodyAttrs ) );
2424
2425                 $ret .= Html::openElement( 'body', $bodyAttrs ) . "\n";
2426
2427                 return $ret;
2428         }
2429
2430         /**
2431          * Add the default ResourceLoader modules to this object
2432          */
2433         private function addDefaultModules() {
2434                 global $wgIncludeLegacyJavaScript, $wgUseAjax, $wgAjaxWatch, $wgEnableMWSuggest;
2435
2436                 // Add base resources
2437                 $this->addModules( array(
2438                         'mediawiki.user',
2439                         'mediawiki.util',
2440                         'mediawiki.page.startup',
2441                         'mediawiki.page.ready',
2442                 ) );
2443                 if ( $wgIncludeLegacyJavaScript ){
2444                         $this->addModules( 'mediawiki.legacy.wikibits' );
2445                 }
2446
2447                 // Add various resources if required
2448                 if ( $wgUseAjax ) {
2449                         $this->addModules( 'mediawiki.legacy.ajax' );
2450
2451                         wfRunHooks( 'AjaxAddScript', array( &$this ) );
2452
2453                         if( $wgAjaxWatch && $this->getUser()->isLoggedIn() ) {
2454                                 $this->addModules( 'mediawiki.action.watch.ajax' );
2455                         }
2456
2457                         if ( $wgEnableMWSuggest && !$this->getUser()->getOption( 'disablesuggest', false ) ) {
2458                                 $this->addModules( 'mediawiki.legacy.mwsuggest' );
2459                         }
2460                 }
2461
2462                 if ( $this->getUser()->getBoolOption( 'editsectiononrightclick' ) ) {
2463                         $this->addModules( 'mediawiki.action.view.rightClickEdit' );
2464                 }
2465
2466                 # Crazy edit-on-double-click stuff
2467                 if ( $this->isArticle() && $this->getUser()->getOption( 'editondblclick' ) ) {
2468                         $this->addModules( 'mediawiki.action.view.dblClickEdit' );
2469                 }
2470         }
2471
2472         /**
2473          * Get a ResourceLoader object associated with this OutputPage
2474          *
2475          * @return ResourceLoader
2476          */
2477         public function getResourceLoader() {
2478                 if ( is_null( $this->mResourceLoader ) ) {
2479                         $this->mResourceLoader = new ResourceLoader();
2480                 }
2481                 return $this->mResourceLoader;
2482         }
2483
2484         /**
2485          * TODO: Document
2486          * @param $modules Array/string with the module name(s)
2487          * @param $only String ResourceLoaderModule TYPE_ class constant
2488          * @param $useESI boolean
2489          * @param $extraQuery Array with extra query parameters to add to each request. array( param => value )
2490          * @return string html <script> and <style> tags
2491          */
2492         protected function makeResourceLoaderLink( $modules, $only, $useESI = false, array $extraQuery = array() ) {
2493                 global $wgResourceLoaderUseESI, $wgResourceLoaderInlinePrivateModules;
2494
2495                 if ( !count( $modules ) ) {
2496                         return '';
2497                 }
2498
2499                 if ( count( $modules ) > 1 ) {
2500                         // Remove duplicate module requests
2501                         $modules = array_unique( (array) $modules );
2502                         // Sort module names so requests are more uniform
2503                         sort( $modules );
2504
2505                         if ( ResourceLoader::inDebugMode() ) {
2506                                 // Recursively call us for every item
2507                                 $links = '';
2508                                 foreach ( $modules as $name ) {
2509                                         $links .= $this->makeResourceLoaderLink( $name, $only, $useESI );
2510                                 }
2511                                 return $links;
2512                         }
2513                 }
2514
2515                 // Create keyed-by-group list of module objects from modules list
2516                 $groups = array();
2517                 $resourceLoader = $this->getResourceLoader();
2518                 foreach ( (array) $modules as $name ) {
2519                         $module = $resourceLoader->getModule( $name );
2520                         # Check that we're allowed to include this module on this page
2521                         if ( !$module
2522                                 || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_SCRIPTS )
2523                                         && $only == ResourceLoaderModule::TYPE_SCRIPTS )
2524                                 || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_STYLES )
2525                                         && $only == ResourceLoaderModule::TYPE_STYLES )
2526                                 )
2527                         {
2528                                 continue;
2529                         }
2530
2531                         $group = $module->getGroup();
2532                         if ( !isset( $groups[$group] ) ) {
2533                                 $groups[$group] = array();
2534                         }
2535                         $groups[$group][$name] = $module;
2536                 }
2537
2538                 $links = '';
2539                 foreach ( $groups as $group => $modules ) {
2540                         // Special handling for user-specific groups
2541                         $user = null;
2542                         if ( ( $group === 'user' || $group === 'private' ) && $this->getUser()->isLoggedIn() ) {
2543                                 $user = $this->getUser()->getName();
2544                         }
2545
2546                         // Create a fake request based on the one we are about to make so modules return
2547                         // correct timestamp and emptiness data
2548                         $query = ResourceLoader::makeLoaderQuery(
2549                                 array(), // modules; not determined yet
2550                                 $this->getLanguage()->getCode(),
2551                                 $this->getSkin()->getSkinName(),
2552                                 $user,
2553                                 null, // version; not determined yet
2554                                 ResourceLoader::inDebugMode(),
2555                                 $only === ResourceLoaderModule::TYPE_COMBINED ? null : $only,
2556                                 $this->isPrintable(),
2557                                 $this->getRequest()->getBool( 'handheld' ),
2558                                 $extraQuery
2559                         );
2560                         $context = new ResourceLoaderContext( $resourceLoader, new FauxRequest( $query ) );
2561                         // Drop modules that know they're empty
2562                         foreach ( $modules as $key => $module ) {
2563                                 if ( $module->isKnownEmpty( $context ) ) {
2564                                         unset( $modules[$key] );
2565                                 }
2566                         }
2567                         // If there are no modules left, skip this group
2568                         if ( $modules === array() ) {
2569                                 continue;
2570                         }
2571
2572                         // Support inlining of private modules if configured as such
2573                         if ( $group === 'private' && $wgResourceLoaderInlinePrivateModules ) {
2574                                 if ( $only == ResourceLoaderModule::TYPE_STYLES ) {
2575                                         $links .= Html::inlineStyle(
2576                                                 $resourceLoader->makeModuleResponse( $context, $modules )
2577                                         );
2578                                 } else {
2579                                         $links .= Html::inlineScript(
2580                                                 ResourceLoader::makeLoaderConditionalScript(
2581                                                         $resourceLoader->makeModuleResponse( $context, $modules )
2582                                                 )
2583                                         );
2584                                 }
2585                                 $links .= "\n";
2586                                 continue;
2587                         }
2588                         // Special handling for the user group; because users might change their stuff
2589                         // on-wiki like user pages, or user preferences; we need to find the highest
2590                         // timestamp of these user-changable modules so we can ensure cache misses on change
2591                         // This should NOT be done for the site group (bug 27564) because anons get that too
2592                         // and we shouldn't be putting timestamps in Squid-cached HTML
2593                         $version = null;
2594                         if ( $group === 'user' ) {
2595                                 // Get the maximum timestamp
2596                                 $timestamp = 1;
2597                                 foreach ( $modules as $module ) {
2598                                         $timestamp = max( $timestamp, $module->getModifiedTime( $context ) );
2599                                 }
2600                                 // Add a version parameter so cache will break when things change
2601                                 $version = wfTimestamp( TS_ISO_8601_BASIC, $timestamp );
2602                         }
2603
2604                         $url = ResourceLoader::makeLoaderURL(
2605                                 array_keys( $modules ),
2606                                 $this->getLanguage()->getCode(),
2607                                 $this->getSkin()->getSkinName(),
2608                                 $user,
2609                                 $version,
2610                                 ResourceLoader::inDebugMode(),
2611                                 $only === ResourceLoaderModule::TYPE_COMBINED ? null : $only,
2612                                 $this->isPrintable(),
2613                                 $this->getRequest()->getBool( 'handheld' ),
2614                                 $extraQuery
2615                         );
2616                         if ( $useESI && $wgResourceLoaderUseESI ) {
2617                                 $esi = Xml::element( 'esi:include', array( 'src' => $url ) );
2618                                 if ( $only == ResourceLoaderModule::TYPE_STYLES ) {
2619                                         $link = Html::inlineStyle( $esi );
2620                                 } else {
2621                                         $link = Html::inlineScript( $esi );
2622                                 }
2623                         } else {
2624                                 // Automatically select style/script elements
2625                                 if ( $only === ResourceLoaderModule::TYPE_STYLES ) {
2626                                         $link = Html::linkedStyle( $url );
2627                                 } else {
2628                                         $link = Html::linkedScript( $url );
2629                                 }
2630                         }
2631
2632                         if( $group == 'noscript' ){
2633                                 $links .= Html::rawElement( 'noscript', array(), $link ) . "\n";
2634                         } else {
2635                                 $links .= $link . "\n";
2636                         }
2637                 }
2638                 return $links;
2639         }
2640
2641         /**
2642          * JS stuff to put in the <head>. This is the startup module, config
2643          * vars and modules marked with position 'top'
2644          *
2645          * @return String: HTML fragment
2646          */
2647         function getHeadScripts() {
2648                 // Startup - this will immediately load jquery and mediawiki modules
2649                 $scripts = $this->makeResourceLoaderLink( 'startup', ResourceLoaderModule::TYPE_SCRIPTS, true );
2650
2651                 // Load config before anything else
2652                 $scripts .= Html::inlineScript(
2653                         ResourceLoader::makeLoaderConditionalScript(
2654                                 ResourceLoader::makeConfigSetScript( $this->getJSVars() )
2655                         )
2656                 );
2657
2658                 // Script and Messages "only" requests marked for top inclusion
2659                 // Messages should go first
2660                 $scripts .= $this->makeResourceLoaderLink( $this->getModuleMessages( true, 'top' ), ResourceLoaderModule::TYPE_MESSAGES );
2661                 $scripts .= $this->makeResourceLoaderLink( $this->getModuleScripts( true, 'top' ), ResourceLoaderModule::TYPE_SCRIPTS );
2662
2663                 // Modules requests - let the client calculate dependencies and batch requests as it likes
2664                 // Only load modules that have marked themselves for loading at the top
2665                 $modules = $this->getModules( true, 'top' );
2666                 if ( $modules ) {
2667                         $scripts .= Html::inlineScript(
2668                                 ResourceLoader::makeLoaderConditionalScript(
2669                                         Xml::encodeJsCall( 'mw.loader.load', array( $modules ) )
2670                                 )
2671                         );
2672                 }
2673
2674                 return $scripts;
2675         }
2676
2677         /**
2678          * JS stuff to put at the bottom of the <body>: modules marked with position 'bottom',
2679          * legacy scripts ($this->mScripts), user preferences, site JS and user JS
2680          *
2681          * @return string
2682          */
2683         function getBottomScripts() {
2684                 global $wgUseSiteJs, $wgAllowUserJs;
2685
2686                 // Script and Messages "only" requests marked for bottom inclusion
2687                 // Messages should go first
2688                 $scripts = $this->makeResourceLoaderLink( $this->getModuleMessages( true, 'bottom' ), ResourceLoaderModule::TYPE_MESSAGES );
2689                 $scripts .= $this->makeResourceLoaderLink( $this->getModuleScripts( true, 'bottom' ), ResourceLoaderModule::TYPE_SCRIPTS );
2690
2691                 // Modules requests - let the client calculate dependencies and batch requests as it likes
2692                 // Only load modules that have marked themselves for loading at the bottom
2693                 $modules = $this->getModules( true, 'bottom' );
2694                 if ( $modules ) {
2695                         $scripts .= Html::inlineScript(
2696                                 ResourceLoader::makeLoaderConditionalScript(
2697                                         Xml::encodeJsCall( 'mw.loader.load', array( $modules ) )
2698                                 )
2699                         );
2700                 }
2701
2702                 // Legacy Scripts
2703                 $scripts .= "\n" . $this->mScripts;
2704
2705                 $userScripts = array( 'user.options', 'user.tokens' );
2706
2707                 // Add site JS if enabled
2708                 if ( $wgUseSiteJs ) {
2709                         $scripts .= $this->makeResourceLoaderLink( 'site', ResourceLoaderModule::TYPE_SCRIPTS );
2710                         if( $this->getUser()->isLoggedIn() ){
2711                                 $userScripts[] = 'user.groups';
2712                         }
2713                 }
2714
2715                 // Add user JS if enabled
2716                 if ( $wgAllowUserJs && $this->getUser()->isLoggedIn() ) {
2717                         if( $this->getTitle() && $this->getTitle()->isJsSubpage() && $this->userCanPreview() ) {
2718                                 # XXX: additional security check/prompt?
2719                                 // We're on a preview of a JS subpage
2720                                 // Exclude this page from the user module in case it's in there (bug 26283)
2721                                 $scripts .= $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_SCRIPTS, false,
2722                                         array( 'excludepage' => $this->getTitle()->getPrefixedDBkey() )
2723                                 );
2724                                 // Load the previewed JS
2725                                 $scripts .= Html::inlineScript( "\n" . $this->getRequest()->getText( 'wpTextbox1' ) . "\n" ) . "\n";
2726                         } else {
2727                                 // Include the user module normally
2728                                 // We can't do $userScripts[] = 'user'; because the user module would end up
2729                                 // being wrapped in a closure, so load it raw like 'site'
2730                                 $scripts .= $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_SCRIPTS );
2731                         }
2732                 }
2733                 $scripts .= $this->makeResourceLoaderLink( $userScripts, ResourceLoaderModule::TYPE_COMBINED );
2734
2735                 return $scripts;
2736         }
2737
2738         /**
2739          * Add one or more variables to be set in mw.config in JavaScript.
2740          *
2741          * @param $key {String|Array} Key or array of key/value pars.
2742          * @param $value {Mixed} Value of the configuration variable.
2743          */
2744         public function addJsConfigVars( $keys, $value ) {
2745                 if ( is_array( $keys ) ) {
2746                         foreach ( $keys as $key => $value ) {
2747                                 $this->mJsConfigVars[$key] = $value;
2748                         }
2749                         return;
2750                 }
2751
2752                 $this->mJsConfigVars[$keys] = $value;
2753         }
2754
2755
2756         /**
2757          * Get an array containing the variables to be set in mw.config in JavaScript.
2758          *
2759          * Do not add things here which can be evaluated in ResourceLoaderStartupScript
2760          * - in other words, page-independent/site-wide variables (without state).
2761          * You will only be adding bloat to the html page and causing page caches to
2762          * have to be purged on configuration changes.
2763          * @return array
2764          */
2765         protected function getJSVars() {
2766                 global $wgUseAjax, $wgEnableMWSuggest;
2767
2768                 $title = $this->getTitle();
2769                 $ns = $title->getNamespace();
2770                 $nsname = MWNamespace::exists( $ns ) ? MWNamespace::getCanonicalName( $ns ) : $title->getNsText();
2771                 if ( $ns == NS_SPECIAL ) {
2772                         list( $canonicalName, /*...*/ ) = SpecialPageFactory::resolveAlias( $title->getDBkey() );
2773                 } else {
2774                         $canonicalName = false; # bug 21115
2775                 }
2776
2777                 $lang = $title->getPageLanguage();
2778
2779                 // Pre-process information
2780                 $separatorTransTable = $lang->separatorTransformTable();
2781                 $separatorTransTable = $separatorTransTable ? $separatorTransTable : array();
2782                 $compactSeparatorTransTable = array(
2783                         implode( "\t", array_keys( $separatorTransTable ) ),
2784                         implode( "\t", $separatorTransTable ),
2785                 );
2786                 $digitTransTable = $lang->digitTransformTable();
2787                 $digitTransTable = $digitTransTable ? $digitTransTable : array();
2788                 $compactDigitTransTable = array(
2789                         implode( "\t", array_keys( $digitTransTable ) ),
2790                         implode( "\t", $digitTransTable ),
2791                 );
2792
2793                 $vars = array(
2794                         'wgCanonicalNamespace' => $nsname,
2795                         'wgCanonicalSpecialPageName' => $canonicalName,
2796                         'wgNamespaceNumber' => $title->getNamespace(),
2797                         'wgPageName' => $title->getPrefixedDBKey(),
2798                         'wgTitle' => $title->getText(),
2799                         'wgCurRevisionId' => $title->getLatestRevID(),
2800                         'wgArticleId' => $title->getArticleId(),
2801                         'wgIsArticle' => $this->isArticle(),
2802                         'wgAction' => $this->getRequest()->getText( 'action', 'view' ),
2803                         'wgUserName' => $this->getUser()->isAnon() ? null : $this->getUser()->getName(),
2804                         'wgUserGroups' => $this->getUser()->getEffectiveGroups(),
2805                         'wgCategories' => $this->getCategories(),
2806                         'wgBreakFrames' => $this->getFrameOptions() == 'DENY',
2807                         'wgPageContentLanguage' => $lang->getCode(),
2808                         'wgSeparatorTransformTable' => $compactSeparatorTransTable,
2809                         'wgDigitTransformTable' => $compactDigitTransTable,
2810                 );
2811                 if ( $lang->hasVariants() ) {
2812                         $vars['wgUserVariant'] = $lang->getPreferredVariant();
2813                 }
2814                 foreach ( $title->getRestrictionTypes() as $type ) {
2815                         $vars['wgRestriction' . ucfirst( $type )] = $title->getRestrictions( $type );
2816                 }
2817                 if ( $wgUseAjax && $wgEnableMWSuggest && !$this->getUser()->getOption( 'disablesuggest', false ) ) {
2818                         $vars['wgSearchNamespaces'] = SearchEngine::userNamespaces( $this->getUser() );
2819                 }
2820                 if ( $title->isMainPage() ) {
2821                         $vars['wgIsMainPage'] = true;
2822                 }
2823                 if ( $this->mRedirectedFrom ) {
2824                         $vars['wgRedirectedFrom'] = $this->mRedirectedFrom->getPrefixedDBKey();
2825                 }
2826
2827                 // Allow extensions to add their custom variables to the mw.config map.
2828                 // Use the 'ResourceLoaderGetConfigVars' hook if the variable is not
2829                 // page-dependant but site-wide (without state).
2830                 // Alternatively, you may want to use OutputPage->addJsConfigVars() instead.
2831                 wfRunHooks( 'MakeGlobalVariablesScript', array( &$vars, $this ) );
2832
2833                 // Merge in variables from addJsConfigVars last
2834                 return array_merge( $vars, $this->mJsConfigVars );
2835         }
2836
2837         /**
2838          * To make it harder for someone to slip a user a fake
2839          * user-JavaScript or user-CSS preview, a random token
2840          * is associated with the login session. If it's not
2841          * passed back with the preview request, we won't render
2842          * the code.
2843          *
2844          * @return bool
2845          */
2846         public function userCanPreview() {
2847                 if ( $this->getRequest()->getVal( 'action' ) != 'submit'
2848                         || !$this->getRequest()->wasPosted()
2849                         || !$this->getUser()->matchEditToken(
2850                                 $this->getRequest()->getVal( 'wpEditToken' ) )
2851                 ) {
2852                         return false;
2853                 }
2854                 if ( !$this->getTitle()->isJsSubpage() && !$this->getTitle()->isCssSubpage() ) {
2855                         return false;
2856                 }
2857
2858                 return !count( $this->getTitle()->getUserPermissionsErrors( 'edit', $this->getUser() ) );
2859         }
2860
2861         /**
2862          * @param $unused Unused
2863          * @param $addContentType bool
2864          *
2865          * @return string HTML tag links to be put in the header.
2866          */
2867         public function getHeadLinks( $unused = null, $addContentType = false ) {
2868                 global $wgUniversalEditButton, $wgFavicon, $wgAppleTouchIcon, $wgEnableAPI,
2869                         $wgSitename, $wgVersion, $wgHtml5, $wgMimeType,
2870                         $wgFeed, $wgOverrideSiteFeed, $wgAdvertisedFeedTypes,
2871                         $wgDisableLangConversion, $wgCanonicalLanguageLinks,
2872                         $wgRightsPage, $wgRightsUrl;
2873
2874                 $tags = array();
2875
2876                 if ( $addContentType ) {
2877                         if ( $wgHtml5 ) {
2878                                 # More succinct than <meta http-equiv=Content-Type>, has the
2879                                 # same effect
2880                                 $tags[] = Html::element( 'meta', array( 'charset' => 'UTF-8' ) );
2881                         } else {
2882                                 $tags[] = Html::element( 'meta', array(
2883                                         'http-equiv' => 'Content-Type',
2884                                         'content' => "$wgMimeType; charset=UTF-8"
2885                                 ) );
2886                                 $tags[] = Html::element( 'meta', array(  // bug 15835
2887                                         'http-equiv' => 'Content-Style-Type',
2888                                         'content' => 'text/css'
2889                                 ) );
2890                         }
2891                 }
2892
2893                 $tags[] = Html::element( 'meta', array(
2894                         'name' => 'generator',
2895                         'content' => "MediaWiki $wgVersion",
2896                 ) );
2897
2898                 $p = "{$this->mIndexPolicy},{$this->mFollowPolicy}";
2899                 if( $p !== 'index,follow' ) {
2900                         // http://www.robotstxt.org/wc/meta-user.html
2901                         // Only show if it's different from the default robots policy
2902                         $tags[] = Html::element( 'meta', array(
2903                                 'name' => 'robots',
2904                                 'content' => $p,
2905                         ) );
2906                 }
2907
2908                 if ( count( $this->mKeywords ) > 0 ) {
2909                         $strip = array(
2910                                 "/<.*?" . ">/" => '',
2911                                 "/_/" => ' '
2912                         );
2913                         $tags[] = Html::element( 'meta', array(
2914                                 'name' => 'keywords',
2915                                 'content' =>  preg_replace(
2916                                         array_keys( $strip ),
2917                                         array_values( $strip ),
2918                                         implode( ',', $this->mKeywords )
2919                                 )
2920                         ) );
2921                 }
2922
2923                 foreach ( $this->mMetatags as $tag ) {
2924                         if ( 0 == strcasecmp( 'http:', substr( $tag[0], 0, 5 ) ) ) {
2925                                 $a = 'http-equiv';
2926                                 $tag[0] = substr( $tag[0], 5 );
2927                         } else {
2928                                 $a = 'name';
2929                         }
2930                         $tags[] = Html::element( 'meta',
2931                                 array(
2932                                         $a => $tag[0],
2933                                         'content' => $tag[1]
2934                                 )
2935                         );
2936                 }
2937
2938                 foreach ( $this->mLinktags as $tag ) {
2939                         $tags[] = Html::element( 'link', $tag );
2940                 }
2941
2942                 # Universal edit button
2943                 if ( $wgUniversalEditButton && $this->isArticleRelated() ) {
2944                         $user = $this->getUser();
2945                         if ( $this->getTitle()->quickUserCan( 'edit', $user )
2946                                 && ( $this->getTitle()->exists() || $this->getTitle()->quickUserCan( 'create', $user ) ) ) {
2947                                 // Original UniversalEditButton
2948                                 $msg = $this->msg( 'edit' )->text();
2949                                 $tags[] = Html::element( 'link', array(
2950                                         'rel' => 'alternate',
2951                                         'type' => 'application/x-wiki',
2952                                         'title' => $msg,
2953                                         'href' => $this->getTitle()->getLocalURL( 'action=edit' )
2954                                 ) );
2955                                 // Alternate edit link
2956                                 $tags[] = Html::element( 'link', array(
2957                                         'rel' => 'edit',
2958                                         'title' => $msg,
2959                                         'href' => $this->getTitle()->getLocalURL( 'action=edit' )
2960                                 ) );
2961                         }
2962                 }
2963
2964                 # Generally the order of the favicon and apple-touch-icon links
2965                 # should not matter, but Konqueror (3.5.9 at least) incorrectly
2966                 # uses whichever one appears later in the HTML source. Make sure
2967                 # apple-touch-icon is specified first to avoid this.
2968                 if ( $wgAppleTouchIcon !== false ) {
2969                         $tags[] = Html::element( 'link', array( 'rel' => 'apple-touch-icon', 'href' => $wgAppleTouchIcon ) );
2970                 }
2971
2972                 if ( $wgFavicon !== false ) {
2973                         $tags[] = Html::element( 'link', array( 'rel' => 'shortcut icon', 'href' => $wgFavicon ) );
2974                 }
2975
2976                 # OpenSearch description link
2977                 $tags[] = Html::element( 'link', array(
2978                         'rel' => 'search',
2979                         'type' => 'application/opensearchdescription+xml',
2980                         'href' => wfScript( 'opensearch_desc' ),
2981                         'title' => $this->msg( 'opensearch-desc' )->inContentLanguage()->text(),
2982                 ) );
2983
2984                 if ( $wgEnableAPI ) {
2985                         # Real Simple Discovery link, provides auto-discovery information
2986                         # for the MediaWiki API (and potentially additional custom API
2987                         # support such as WordPress or Twitter-compatible APIs for a
2988                         # blogging extension, etc)
2989                         $tags[] = Html::element( 'link', array(
2990                                 'rel' => 'EditURI',
2991                                 'type' => 'application/rsd+xml',
2992                                 // Output a protocol-relative URL here if $wgServer is protocol-relative
2993                                 // Whether RSD accepts relative or protocol-relative URLs is completely undocumented, though
2994                                 'href' => wfExpandUrl( wfAppendQuery( wfScript( 'api' ), array( 'action' => 'rsd' ) ), PROTO_RELATIVE ),
2995                         ) );
2996                 }
2997
2998
2999                 # Language variants
3000                 if ( !$wgDisableLangConversion && $wgCanonicalLanguageLinks ) {
3001                         $lang = $this->getTitle()->getPageLanguage();
3002                         if ( $lang->hasVariants() ) {
3003
3004                                 $urlvar = $lang->getURLVariant();
3005
3006                                 if ( !$urlvar ) {
3007                                         $variants = $lang->getVariants();
3008                                         foreach ( $variants as $_v ) {
3009                                                 $tags[] = Html::element( 'link', array(
3010                                                         'rel' => 'alternate',
3011                                                         'hreflang' => $_v,
3012                                                         'href' => $this->getTitle()->getLocalURL( array( 'variant' => $_v ) ) )
3013                                                 );
3014                                         }
3015                                 } else {
3016                                         $tags[] = Html::element( 'link', array(
3017                                                 'rel' => 'canonical',
3018                                                 'href' => $this->getTitle()->getCanonicalUrl()
3019                                         ) );
3020                                 }
3021                         }
3022                 }
3023
3024                 # Copyright
3025                 $copyright = '';
3026                 if ( $wgRightsPage ) {
3027                         $copy = Title::newFromText( $wgRightsPage );
3028
3029                         if ( $copy ) {
3030                                 $copyright = $copy->getLocalURL();
3031                         }
3032                 }
3033
3034                 if ( !$copyright && $wgRightsUrl ) {
3035                         $copyright = $wgRightsUrl;
3036                 }
3037
3038                 if ( $copyright ) {
3039                         $tags[] = Html::element( 'link', array(
3040                                 'rel' => 'copyright',
3041                                 'href' => $copyright )
3042                         );
3043                 }
3044
3045                 # Feeds
3046                 if ( $wgFeed ) {
3047                         foreach( $this->getSyndicationLinks() as $format => $link ) {
3048                                 # Use the page name for the title.  In principle, this could
3049                                 # lead to issues with having the same name for different feeds
3050                                 # corresponding to the same page, but we can't avoid that at
3051                                 # this low a level.
3052
3053                                 $tags[] = $this->feedLink(
3054                                         $format,
3055                                         $link,
3056                                         # Used messages: 'page-rss-feed' and 'page-atom-feed' (for an easier grep)
3057                                         $this->msg( "page-{$format}-feed", $this->getTitle()->getPrefixedText() )->text()
3058                                 );
3059                         }
3060
3061                         # Recent changes feed should appear on every page (except recentchanges,
3062                         # that would be redundant). Put it after the per-page feed to avoid
3063                         # changing existing behavior. It's still available, probably via a
3064                         # menu in your browser. Some sites might have a different feed they'd
3065                         # like to promote instead of the RC feed (maybe like a "Recent New Articles"
3066                         # or "Breaking news" one). For this, we see if $wgOverrideSiteFeed is defined.
3067                         # If so, use it instead.
3068                         if ( $wgOverrideSiteFeed ) {
3069                                 foreach ( $wgOverrideSiteFeed as $type => $feedUrl ) {
3070                                         // Note, this->feedLink escapes the url.
3071                                         $tags[] = $this->feedLink(
3072                                                 $type,
3073                                                 $feedUrl,
3074                                                 $this->msg( "site-{$type}-feed", $wgSitename )->text()
3075                                         );
3076                                 }
3077                         } elseif ( !$this->getTitle()->isSpecial( 'Recentchanges' ) ) {
3078                                 foreach ( $wgAdvertisedFeedTypes as $format ) {
3079                                         $tags[] = $this->feedLink(
3080                                                 $format,
3081                                                 $this->getTitle()->getLocalURL( "feed={$format}" ),
3082                                                 $this->msg( "site-{$format}-feed", $wgSitename )->text() # For grep: 'site-rss-feed', 'site-atom-feed'.
3083                                         );
3084                                 }
3085                         }
3086                 }
3087                 return implode( "\n", $tags );
3088         }
3089
3090         /**
3091          * Generate a <link rel/> for a feed.
3092          *
3093          * @param $type String: feed type
3094          * @param $url String: URL to the feed
3095          * @param $text String: value of the "title" attribute
3096          * @return String: HTML fragment
3097          */
3098         private function feedLink( $type, $url, $text ) {
3099                 return Html::element( 'link', array(
3100                         'rel' => 'alternate',
3101                         'type' => "application/$type+xml",
3102                         'title' => $text,
3103                         'href' => $url )
3104                 );
3105         }
3106
3107         /**
3108          * Add a local or specified stylesheet, with the given media options.
3109          * Meant primarily for internal use...
3110          *
3111          * @param $style String: URL to the file
3112          * @param $media String: to specify a media type, 'screen', 'printable', 'handheld' or any.
3113          * @param $condition String: for IE conditional comments, specifying an IE version
3114          * @param $dir String: set to 'rtl' or 'ltr' for direction-specific sheets
3115          */
3116         public function addStyle( $style, $media = '', $condition = '', $dir = '' ) {
3117                 $options = array();
3118                 // Even though we expect the media type to be lowercase, but here we
3119                 // force it to lowercase to be safe.
3120                 if( $media ) {
3121                         $options['media'] = $media;
3122                 }
3123                 if( $condition ) {
3124                         $options['condition'] = $condition;
3125                 }
3126                 if( $dir ) {
3127                         $options['dir'] = $dir;
3128                 }
3129                 $this->styles[$style] = $options;
3130         }
3131
3132         /**
3133          * Adds inline CSS styles
3134          * @param $style_css Mixed: inline CSS
3135          * @param $flip String: Set to 'flip' to flip the CSS if needed
3136          */
3137         public function addInlineStyle( $style_css, $flip = 'noflip' ) {
3138                 if( $flip === 'flip' && $this->getLanguage()->isRTL() ) {
3139                         # If wanted, and the interface is right-to-left, flip the CSS
3140                         $style_css = CSSJanus::transform( $style_css, true, false );
3141                 }
3142                 $this->mInlineStyles .= Html::inlineStyle( $style_css );
3143         }
3144
3145         /**
3146          * Build a set of <link>s for the stylesheets specified in the $this->styles array.
3147          * These will be applied to various media & IE conditionals.
3148          *
3149          * @return string
3150          */
3151         public function buildCssLinks() {
3152                 global $wgUseSiteCss, $wgAllowUserCss, $wgAllowUserCssPrefs;
3153
3154                 $this->getSkin()->setupSkinUserCss( $this );
3155
3156                 // Add ResourceLoader styles
3157                 // Split the styles into four groups
3158                 $styles = array( 'other' => array(), 'user' => array(), 'site' => array(), 'private' => array(), 'noscript' => array() );
3159                 $otherTags = ''; // Tags to append after the normal <link> tags
3160                 $resourceLoader = $this->getResourceLoader();
3161
3162                 $moduleStyles = $this->getModuleStyles();
3163
3164                 // Per-site custom styles
3165                 if ( $wgUseSiteCss ) {
3166                         $moduleStyles[] = 'site';
3167                         $moduleStyles[] = 'noscript';
3168                         if( $this->getUser()->isLoggedIn() ){
3169                                 $moduleStyles[] = 'user.groups';
3170                         }
3171                 }
3172
3173                 // Per-user custom styles
3174                 if ( $wgAllowUserCss ) {
3175                         if ( $this->getTitle()->isCssSubpage() && $this->userCanPreview() ) {
3176                                 // We're on a preview of a CSS subpage
3177                                 // Exclude this page from the user module in case it's in there (bug 26283)
3178                                 $otherTags .= $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_STYLES, false,
3179                                         array( 'excludepage' => $this->getTitle()->getPrefixedDBkey() )
3180                                 );
3181                                 // Load the previewed CSS
3182                                 $otherTags .= Html::inlineStyle( $this->getRequest()->getText( 'wpTextbox1' ) );
3183                         } else {
3184                                 // Load the user styles normally
3185                                 $moduleStyles[] = 'user';
3186                         }
3187                 }
3188
3189                 // Per-user preference styles
3190                 if ( $wgAllowUserCssPrefs ) {
3191                         $moduleStyles[] = 'user.options';
3192                 }
3193
3194                 foreach ( $moduleStyles as $name ) {
3195                         $module = $resourceLoader->getModule( $name );
3196                         if ( !$module ) {
3197                                 continue;
3198                         }
3199                         $group = $module->getGroup();
3200                         // Modules in groups named "other" or anything different than "user", "site" or "private"
3201                         // will be placed in the "other" group
3202                         $styles[isset( $styles[$group] ) ? $group : 'other'][] = $name;
3203                 }
3204
3205                 // We want site, private and user styles to override dynamically added styles from modules, but we want
3206                 // dynamically added styles to override statically added styles from other modules. So the order
3207                 // has to be other, dynamic, site, private, user
3208                 // Add statically added styles for other modules
3209                 $ret = $this->makeResourceLoaderLink( $styles['other'], ResourceLoaderModule::TYPE_STYLES );
3210                 // Add normal styles added through addStyle()/addInlineStyle() here
3211                 $ret .= implode( "\n", $this->buildCssLinksArray() ) . $this->mInlineStyles;
3212                 // Add marker tag to mark the place where the client-side loader should inject dynamic styles
3213                 // We use a <meta> tag with a made-up name for this because that's valid HTML
3214                 $ret .= Html::element( 'meta', array( 'name' => 'ResourceLoaderDynamicStyles', 'content' => '' ) ) . "\n";
3215
3216                 // Add site, private and user styles
3217                 // 'private' at present only contains user.options, so put that before 'user'
3218                 // Any future private modules will likely have a similar user-specific character
3219                 foreach ( array( 'site', 'noscript', 'private', 'user' ) as $group ) {
3220                         $ret .= $this->makeResourceLoaderLink( $styles[$group],
3221                                         ResourceLoaderModule::TYPE_STYLES
3222                         );
3223                 }
3224
3225                 // Add stuff in $otherTags (previewed user CSS if applicable)
3226                 $ret .= $otherTags;
3227                 return $ret;
3228         }
3229
3230         /**
3231          * @return Array
3232          */
3233         public function buildCssLinksArray() {
3234                 $links = array();
3235
3236                 // Add any extension CSS
3237                 foreach ( $this->mExtStyles as $url ) {
3238                         $this->addStyle( $url );
3239                 }
3240                 $this->mExtStyles = array();
3241
3242                 foreach( $this->styles as $file => $options ) {
3243                         $link = $this->styleLink( $file, $options );
3244                         if( $link ) {
3245                                 $links[$file] = $link;
3246                         }
3247                 }
3248                 return $links;
3249         }
3250
3251         /**
3252          * Generate \<link\> tags for stylesheets
3253          *
3254          * @param $style String: URL to the file
3255          * @param $options Array: option, can contain 'condition', 'dir', 'media'
3256          *                 keys
3257          * @return String: HTML fragment
3258          */
3259         protected function styleLink( $style, $options ) {
3260                 if( isset( $options['dir'] ) ) {
3261                         if( $this->getLanguage()->getDir() != $options['dir'] ) {
3262                                 return '';
3263                         }
3264                 }
3265
3266                 if( isset( $options['media'] ) ) {
3267                         $media = self::transformCssMedia( $options['media'] );
3268                         if( is_null( $media ) ) {
3269                                 return '';
3270                         }
3271                 } else {
3272                         $media = 'all';
3273                 }
3274
3275                 if( substr( $style, 0, 1 ) == '/' ||
3276                         substr( $style, 0, 5 ) == 'http:' ||
3277                         substr( $style, 0, 6 ) == 'https:' ) {
3278                         $url = $style;
3279                 } else {
3280                         global $wgStylePath, $wgStyleVersion;
3281                         $url = $wgStylePath . '/' . $style . '?' . $wgStyleVersion;
3282                 }
3283
3284                 $link = Html::linkedStyle( $url, $media );
3285
3286                 if( isset( $options['condition'] ) ) {
3287                         $condition = htmlspecialchars( $options['condition'] );
3288                         $link = "<!--[if $condition]>$link<![endif]-->";
3289                 }
3290                 return $link;
3291         }
3292
3293         /**
3294          * Transform "media" attribute based on request parameters
3295          *
3296          * @param $media String: current value of the "media" attribute
3297          * @return String: modified value of the "media" attribute
3298          */
3299         public static function transformCssMedia( $media ) {
3300                 global $wgRequest, $wgHandheldForIPhone;
3301
3302                 // Switch in on-screen display for media testing
3303                 $switches = array(
3304                         'printable' => 'print',
3305                         'handheld' => 'handheld',
3306                 );
3307                 foreach( $switches as $switch => $targetMedia ) {
3308                         if( $wgRequest->getBool( $switch ) ) {
3309                                 if( $media == $targetMedia ) {
3310                                         $media = '';
3311                                 } elseif( $media == 'screen' ) {
3312                                         return null;
3313                                 }
3314                         }
3315                 }
3316
3317                 // Expand longer media queries as iPhone doesn't grok 'handheld'
3318                 if( $wgHandheldForIPhone ) {
3319                         $mediaAliases = array(
3320                                 'screen' => 'screen and (min-device-width: 481px)',
3321                                 'handheld' => 'handheld, only screen and (max-device-width: 480px)',
3322                         );
3323
3324                         if( isset( $mediaAliases[$media] ) ) {
3325                                 $media = $mediaAliases[$media];
3326                         }
3327                 }
3328
3329                 return $media;
3330         }
3331
3332         /**
3333          * Add a wikitext-formatted message to the output.
3334          * This is equivalent to:
3335          *
3336          *    $wgOut->addWikiText( wfMsgNoTrans( ... ) )
3337          */
3338         public function addWikiMsg( /*...*/ ) {
3339                 $args = func_get_args();
3340                 $name = array_shift( $args );
3341                 $this->addWikiMsgArray( $name, $args );
3342         }
3343
3344         /**
3345          * Add a wikitext-formatted message to the output.
3346          * Like addWikiMsg() except the parameters are taken as an array
3347          * instead of a variable argument list.
3348          *
3349          * @param $name string
3350          * @param $args array
3351          */
3352         public function addWikiMsgArray( $name, $args ) {
3353                 $this->addWikiText( $this->msg( $name, $args )->plain() );
3354         }
3355
3356         /**
3357          * This function takes a number of message/argument specifications, wraps them in
3358          * some overall structure, and then parses the result and adds it to the output.
3359          *
3360          * In the $wrap, $1 is replaced with the first message, $2 with the second, and so
3361          * on. The subsequent arguments may either be strings, in which case they are the
3362          * message names, or arrays, in which case the first element is the message name,
3363          * and subsequent elements are the parameters to that message.
3364          *
3365          * The special named parameter 'options' in a message specification array is passed
3366          * through to the $options parameter of wfMsgExt().
3367          *
3368          * Don't use this for messages that are not in users interface language.
3369          *
3370          * For example:
3371          *
3372          *    $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>", 'some-error' );
3373          *
3374          * Is equivalent to:
3375          *
3376          *    $wgOut->addWikiText( "<div class='error'>\n" . wfMsgNoTrans( 'some-error' ) . "\n</div>" );
3377          *
3378          * The newline after opening div is needed in some wikitext. See bug 19226.
3379          *
3380          * @param $wrap string
3381          */
3382         public function wrapWikiMsg( $wrap /*, ...*/ ) {
3383                 $msgSpecs = func_get_args();
3384                 array_shift( $msgSpecs );
3385                 $msgSpecs = array_values( $msgSpecs );
3386                 $s = $wrap;
3387                 foreach ( $msgSpecs as $n => $spec ) {
3388                         $options = array();
3389                         if ( is_array( $spec ) ) {
3390                                 $args = $spec;
3391                                 $name = array_shift( $args );
3392                                 if ( isset( $args['options'] ) ) {
3393                                         $options = $args['options'];
3394                                         unset( $args['options'] );
3395                                 }
3396                         }  else {
3397                                 $args = array();
3398                                 $name = $spec;
3399                         }
3400                         $s = str_replace( '$' . ( $n + 1 ), wfMsgExt( $name, $options, $args ), $s );
3401                 }
3402                 $this->addWikiText( $s );
3403         }
3404
3405         /**
3406          * Include jQuery core. Use this to avoid loading it multiple times
3407          * before we get a usable script loader.
3408          *
3409          * @param $modules Array: list of jQuery modules which should be loaded
3410          * @return Array: the list of modules which were not loaded.
3411          * @since 1.16
3412          * @deprecated since 1.17
3413          */
3414         public function includeJQuery( $modules = array() ) {
3415                 return array();
3416         }
3417
3418 }