includes/OutputPage.php

   1 <?php
   2 /**
   3  * Preparation for the final page rendering.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 use MediaWiki\Logger\LoggerFactory;
  24 use WrappedString\WrappedString;
  25
  26 /**
  27  * This class should be covered by a general architecture document which does
  28  * not exist as of January 2011.  This is one of the Core classes and should
  29  * be read at least once by any new developers.
  30  *
  31  * This class is used to prepare the final rendering. A skin is then
  32  * applied to the output parameters (links, javascript, html, categories ...).
  33  *
  34  * @todo FIXME: Another class handles sending the whole page to the client.
  35  *
  36  * Some comments comes from a pairing session between Zak Greant and Antoine Musso
  37  * in November 2010.
  38  *
  39  * @todo document
  40  */
  41 class OutputPage extends ContextSource {
  42         /** @var array Should be private. Used with addMeta() which adds "<meta>" */
  43         protected $mMetatags = array();
  44
  45         /** @var array */
  46         protected $mLinktags = array();
  47
  48         /** @var bool */
  49         protected $mCanonicalUrl = false;
  50
  51         /**
  52          * @var array Additional stylesheets. Looks like this is for extensions.
  53          *   Might be replaced by ResourceLoader.
  54          */
  55         protected $mExtStyles = array();
  56
  57         /**
  58          * @var string Should be private - has getter and setter. Contains
  59          *   the HTML title */
  60         public $mPagetitle = '';
  61
  62         /**
  63          * @var string Contains all of the "<body>" content. Should be private we
  64          *   got set/get accessors and the append() method.
  65          */
  66         public $mBodytext = '';
  67
  68         /**
  69          * Holds the debug lines that will be output as comments in page source if
  70          * $wgDebugComments is enabled. See also $wgShowDebug.
  71          * @deprecated since 1.20; use MWDebug class instead.
  72          */
  73         public $mDebugtext = '';
  74
  75         /** @var string Stores contents of "<title>" tag */
  76         private $mHTMLtitle = '';
  77
  78         /**
  79          * @var bool Is the displayed content related to the source of the
  80          *   corresponding wiki article.
  81          */
  82         private $mIsarticle = false;
  83
  84         /** @var bool Stores "article flag" toggle. */
  85         private $mIsArticleRelated = true;
  86
  87         /**
  88          * @var bool We have to set isPrintable(). Some pages should
  89          * never be printed (ex: redirections).
  90          */
  91         private $mPrintable = false;
  92
  93         /**
  94          * @var array Contains the page subtitle. Special pages usually have some
  95          *   links here. Don't confuse with site subtitle added by skins.
  96          */
  97         private $mSubtitle = array();
  98
  99         /** @var string */
 100         public $mRedirect = '';
 101
 102         /** @var int */
 103         protected $mStatusCode;
 104
 105         /**
 106          * @var string Variable mLastModified and mEtag are used for sending cache control.
 107          *   The whole caching system should probably be moved into its own class.
 108          */
 109         protected $mLastModified = '';
 110
 111         /**
 112          * Contains an HTTP Entity Tags (see RFC 2616 section 3.13) which is used
 113          * as a unique identifier for the content. It is later used by the client
 114          * to compare its cached version with the server version. Client sends
 115          * headers If-Match and If-None-Match containing its locally cached ETAG value.
 116          *
 117          * To get more information, you will have to look at HTTP/1.1 protocol which
 118          * is properly described in RFC 2616 : http://tools.ietf.org/html/rfc2616
 119          */
 120         private $mETag = false;
 121
 122         /** @var array */
 123         protected $mCategoryLinks = array();
 124
 125         /** @var array */
 126         protected $mCategories = array();
 127
 128         /** @var array */
 129         protected $mIndicators = array();
 130
 131         /** @var array Array of Interwiki Prefixed (non DB key) Titles (e.g. 'fr:Test page') */
 132         private $mLanguageLinks = array();
 133
 134         /**
 135          * Used for JavaScript (predates ResourceLoader)
 136          * @todo We should split JS / CSS.
 137          * mScripts content is inserted as is in "<head>" by Skin. This might
 138          * contain either a link to a stylesheet or inline CSS.
 139          */
 140         private $mScripts = '';
 141
 142         /** @var string Inline CSS styles. Use addInlineStyle() sparingly */
 143         protected $mInlineStyles = '';
 144
 145         /**
 146          * @var string Used by skin template.
 147          * Example: $tpl->set( 'displaytitle', $out->mPageLinkTitle );
 148          */
 149         public $mPageLinkTitle = '';
 150
 151         /** @var array Array of elements in "<head>". Parser might add its own headers! */
 152         protected $mHeadItems = array();
 153
 154         /** @var array */
 155         protected $mModules = array();
 156
 157         /** @var array */
 158         protected $mModuleScripts = array();
 159
 160         /** @var array */
 161         protected $mModuleStyles = array();
 162
 163         /** @var ResourceLoader */
 164         protected $mResourceLoader;
 165
 166         /** @var array */
 167         protected $mJsConfigVars = array();
 168
 169         /** @var array */
 170         protected $mTemplateIds = array();
 171
 172         /** @var array */
 173         protected $mImageTimeKeys = array();
 174
 175         /** @var string */
 176         public $mRedirectCode = '';
 177
 178         protected $mFeedLinksAppendQuery = null;
 179
 180         /** @var array
 181          * What level of 'untrustworthiness' is allowed in CSS/JS modules loaded on this page?
 182          * @see ResourceLoaderModule::$origin
 183          * ResourceLoaderModule::ORIGIN_ALL is assumed unless overridden;
 184          */
 185         protected $mAllowedModules = array(
 186                 ResourceLoaderModule::TYPE_COMBINED => ResourceLoaderModule::ORIGIN_ALL,
 187         );
 188
 189         /** @var bool Whether output is disabled.  If this is true, the 'output' method will do nothing. */
 190         protected $mDoNothing = false;
 191
 192         // Parser related.
 193
 194         /** @var int */
 195         protected $mContainsNewMagic = 0;
 196
 197         /**
 198          * lazy initialised, use parserOptions()
 199          * @var ParserOptions
 200          */
 201         protected $mParserOptions = null;
 202
 203         /**
 204          * Handles the Atom / RSS links.
 205          * We probably only support Atom in 2011.
 206          * @see $wgAdvertisedFeedTypes
 207          */
 208         private $mFeedLinks = array();
 209
 210         // Gwicke work on squid caching? Roughly from 2003.
 211         protected $mEnableClientCache = true;
 212
 213         /** @var bool Flag if output should only contain the body of the article. */
 214         private $mArticleBodyOnly = false;
 215
 216         /** @var bool */
 217         protected $mNewSectionLink = false;
 218
 219         /** @var bool */
 220         protected $mHideNewSectionLink = false;
 221
 222         /**
 223          * @var bool Comes from the parser. This was probably made to load CSS/JS
 224          * only if we had "<gallery>". Used directly in CategoryPage.php.
 225          * Looks like ResourceLoader can replace this.
 226          */
 227         public $mNoGallery = false;
 228
 229         /** @var string */
 230         private $mPageTitleActionText = '';
 231
 232         /** @var array */
 233         private $mParseWarnings = array();
 234
 235         /** @var int Cache stuff. Looks like mEnableClientCache */
 236         protected $mCdnMaxage = 0;
 237         /** @var int Upper limit on mCdnMaxage */
 238         protected $mCdnMaxageLimit = INF;
 239
 240         /**
 241          * @var bool Controls if anti-clickjacking / frame-breaking headers will
 242          * be sent. This should be done for pages where edit actions are possible.
 243          * Setters: $this->preventClickjacking() and $this->allowClickjacking().
 244          */
 245         protected $mPreventClickjacking = true;
 246
 247         /** @var int To include the variable {{REVISIONID}} */
 248         private $mRevisionId = null;
 249
 250         /** @var string */
 251         private $mRevisionTimestamp = null;
 252
 253         /** @var array */
 254         protected $mFileVersion = null;
 255
 256         /**
 257          * @var array An array of stylesheet filenames (relative from skins path),
 258          * with options for CSS media, IE conditions, and RTL/LTR direction.
 259          * For internal use; add settings in the skin via $this->addStyle()
 260          *
 261          * Style again! This seems like a code duplication since we already have
 262          * mStyles. This is what makes Open Source amazing.
 263          */
 264         protected $styles = array();
 265
 266         /**
 267          * Whether jQuery is already handled.
 268          */
 269         protected $mJQueryDone = false;
 270
 271         private $mIndexPolicy = 'index';
 272         private $mFollowPolicy = 'follow';
 273         private $mVaryHeader = array(
 274                 'Accept-Encoding' => array( 'match=gzip' ),
 275         );
 276
 277         /**
 278          * If the current page was reached through a redirect, $mRedirectedFrom contains the Title
 279          * of the redirect.
 280          *
 281          * @var Title
 282          */
 283         private $mRedirectedFrom = null;
 284
 285         /**
 286          * Additional key => value data
 287          */
 288         private $mProperties = array();
 289
 290         /**
 291          * @var string|null ResourceLoader target for load.php links. If null, will be omitted
 292          */
 293         private $mTarget = null;
 294
 295         /**
 296          * @var bool Whether parser output should contain table of contents
 297          */
 298         private $mEnableTOC = true;
 299
 300         /**
 301          * @var bool Whether parser output should contain section edit links
 302          */
 303         private $mEnableSectionEditLinks = true;
 304
 305         /**
 306          * @var string|null The URL to send in a <link> element with rel=copyright
 307          */
 308         private $copyrightUrl;
 309
 310         /**
 311          * Constructor for OutputPage. This should not be called directly.
 312          * Instead a new RequestContext should be created and it will implicitly create
 313          * a OutputPage tied to that context.
 314          * @param IContextSource|null $context
 315          */
 316         function __construct( IContextSource $context = null ) {
 317                 if ( $context === null ) {
 318                         # Extensions should use `new RequestContext` instead of `new OutputPage` now.
 319                         wfDeprecated( __METHOD__, '1.18' );
 320                 } else {
 321                         $this->setContext( $context );
 322                 }
 323         }
 324
 325         /**
 326          * Redirect to $url rather than displaying the normal page
 327          *
 328          * @param string $url URL
 329          * @param string $responsecode HTTP status code
 330          */
 331         public function redirect( $url, $responsecode = '302' ) {
 332                 # Strip newlines as a paranoia check for header injection in PHP<5.1.2
 333                 $this->mRedirect = str_replace( "\n", '', $url );
 334                 $this->mRedirectCode = $responsecode;
 335         }
 336
 337         /**
 338          * Get the URL to redirect to, or an empty string if not redirect URL set
 339          *
 340          * @return string
 341          */
 342         public function getRedirect() {
 343                 return $this->mRedirect;
 344         }
 345
 346         /**
 347          * Set the copyright URL to send with the output.
 348          * Empty string to omit, null to reset.
 349          *
 350          * @since 1.26
 351          *
 352          * @param string|null $url
 353          */
 354         public function setCopyrightUrl( $url ) {
 355                 $this->copyrightUrl = $url;
 356         }
 357
 358         /**
 359          * Set the HTTP status code to send with the output.
 360          *
 361          * @param int $statusCode
 362          */
 363         public function setStatusCode( $statusCode ) {
 364                 $this->mStatusCode = $statusCode;
 365         }
 366
 367         /**
 368          * Add a new "<meta>" tag
 369          * To add an http-equiv meta tag, precede the name with "http:"
 370          *
 371          * @param string $name Tag name
 372          * @param string $val Tag value
 373          */
 374         function addMeta( $name, $val ) {
 375                 array_push( $this->mMetatags, array( $name, $val ) );
 376         }
 377
 378         /**
 379          * Returns the current <meta> tags
 380          *
 381          * @since 1.25
 382          * @return array
 383          */
 384         public function getMetaTags() {
 385                 return $this->mMetatags;
 386         }
 387
 388         /**
 389          * Add a new \<link\> tag to the page header.
 390          *
 391          * Note: use setCanonicalUrl() for rel=canonical.
 392          *
 393          * @param array $linkarr Associative array of attributes.
 394          */
 395         function addLink( array $linkarr ) {
 396                 array_push( $this->mLinktags, $linkarr );
 397         }
 398
 399         /**
 400          * Returns the current <link> tags
 401          *
 402          * @since 1.25
 403          * @return array
 404          */
 405         public function getLinkTags() {
 406                 return $this->mLinktags;
 407         }
 408
 409         /**
 410          * Add a new \<link\> with "rel" attribute set to "meta"
 411          *
 412          * @param array $linkarr Associative array mapping attribute names to their
 413          *                 values, both keys and values will be escaped, and the
 414          *                 "rel" attribute will be automatically added
 415          */
 416         function addMetadataLink( array $linkarr ) {
 417                 $linkarr['rel'] = $this->getMetadataAttribute();
 418                 $this->addLink( $linkarr );
 419         }
 420
 421         /**
 422          * Set the URL to be used for the <link rel=canonical>. This should be used
 423          * in preference to addLink(), to avoid duplicate link tags.
 424          * @param string $url
 425          */
 426         function setCanonicalUrl( $url ) {
 427                 $this->mCanonicalUrl = $url;
 428         }
 429
 430         /**
 431          * Returns the URL to be used for the <link rel=canonical> if
 432          * one is set.
 433          *
 434          * @since 1.25
 435          * @return bool|string
 436          */
 437         public function getCanonicalUrl() {
 438                 return $this->mCanonicalUrl;
 439         }
 440
 441         /**
 442          * Get the value of the "rel" attribute for metadata links
 443          *
 444          * @return string
 445          */
 446         public function getMetadataAttribute() {
 447                 # note: buggy CC software only reads first "meta" link
 448                 static $haveMeta = false;
 449                 if ( $haveMeta ) {
 450                         return 'alternate meta';
 451                 } else {
 452                         $haveMeta = true;
 453                         return 'meta';
 454                 }
 455         }
 456
 457         /**
 458          * Add raw HTML to the list of scripts (including \<script\> tag, etc.)
 459          * Internal use only. Use OutputPage::addModules() or OutputPage::addJsConfigVars()
 460          * if possible.
 461          *
 462          * @param string $script Raw HTML
 463          */
 464         function addScript( $script ) {
 465                 $this->mScripts .= $script . "\n";
 466         }
 467
 468         /**
 469          * Register and add a stylesheet from an extension directory.
 470          *
 471          * @deprecated since 1.27 use addModuleStyles() or addStyle() instead
 472          * @param string $url Path to sheet.  Provide either a full url (beginning
 473          *             with 'http', etc) or a relative path from the document root
 474          *             (beginning with '/').  Otherwise it behaves identically to
 475          *             addStyle() and draws from the /skins folder.
 476          */
 477         public function addExtensionStyle( $url ) {
 478                 wfDeprecated( __METHOD__, '1.27' );
 479                 array_push( $this->mExtStyles, $url );
 480         }
 481
 482         /**
 483          * Get all styles added by extensions
 484          *
 485          * @deprecated since 1.27
 486          * @return array
 487          */
 488         function getExtStyle() {
 489                 wfDeprecated( __METHOD__, '1.27' );
 490                 return $this->mExtStyles;
 491         }
 492
 493         /**
 494          * Add a JavaScript file out of skins/common, or a given relative path.
 495          * Internal use only. Use OutputPage::addModules() if possible.
 496          *
 497          * @param string $file Filename in skins/common or complete on-server path
 498          *              (/foo/bar.js)
 499          * @param string $version Style version of the file. Defaults to $wgStyleVersion
 500          */
 501         public function addScriptFile( $file, $version = null ) {
 502                 // See if $file parameter is an absolute URL or begins with a slash
 503                 if ( substr( $file, 0, 1 ) == '/' || preg_match( '#^[a-z]*://#i', $file ) ) {
 504                         $path = $file;
 505                 } else {
 506                         $path = $this->getConfig()->get( 'StylePath' ) . "/common/{$file}";
 507                 }
 508                 if ( is_null( $version ) ) {
 509                         $version = $this->getConfig()->get( 'StyleVersion' );
 510                 }
 511                 $this->addScript( Html::linkedScript( wfAppendQuery( $path, $version ) ) );
 512         }
 513
 514         /**
 515          * Add a self-contained script tag with the given contents
 516          * Internal use only. Use OutputPage::addModules() if possible.
 517          *
 518          * @param string $script JavaScript text, no "<script>" tags
 519          */
 520         public function addInlineScript( $script ) {
 521                 $this->mScripts .= Html::inlineScript( "\n$script\n" ) . "\n";
 522         }
 523
 524         /**
 525          * Get all registered JS and CSS tags for the header.
 526          *
 527          * @return string
 528          * @deprecated since 1.24 Use OutputPage::headElement to build the full header.
 529          */
 530         function getScript() {
 531                 wfDeprecated( __METHOD__, '1.24' );
 532                 return $this->mScripts . $this->getHeadItems();
 533         }
 534
 535         /**
 536          * Filter an array of modules to remove insufficiently trustworthy members, and modules
 537          * which are no longer registered (eg a page is cached before an extension is disabled)
 538          * @param array $modules
 539          * @param string|null $position If not null, only return modules with this position
 540          * @param string $type
 541          * @return array
 542          */
 543         protected function filterModules( array $modules, $position = null,
 544                 $type = ResourceLoaderModule::TYPE_COMBINED
 545         ) {
 546                 $resourceLoader = $this->getResourceLoader();
 547                 $filteredModules = array();
 548                 foreach ( $modules as $val ) {
 549                         $module = $resourceLoader->getModule( $val );
 550                         if ( $module instanceof ResourceLoaderModule
 551                                 && $module->getOrigin() <= $this->getAllowedModules( $type )
 552                                 && ( is_null( $position ) || $module->getPosition() == $position )
 553                                 && ( !$this->mTarget || in_array( $this->mTarget, $module->getTargets() ) )
 554                         ) {
 555                                 $filteredModules[] = $val;
 556                         }
 557                 }
 558                 return $filteredModules;
 559         }
 560
 561         /**
 562          * Get the list of modules to include on this page
 563          *
 564          * @param bool $filter Whether to filter out insufficiently trustworthy modules
 565          * @param string|null $position If not null, only return modules with this position
 566          * @param string $param
 567          * @return array Array of module names
 568          */
 569         public function getModules( $filter = false, $position = null, $param = 'mModules' ) {
 570                 $modules = array_values( array_unique( $this->$param ) );
 571                 return $filter
 572                         ? $this->filterModules( $modules, $position )
 573                         : $modules;
 574         }
 575
 576         /**
 577          * Add one or more modules recognized by ResourceLoader. Modules added
 578          * through this function will be loaded by ResourceLoader when the
 579          * page loads.
 580          *
 581          * @param string|array $modules Module name (string) or array of module names
 582          */
 583         public function addModules( $modules ) {
 584                 $this->mModules = array_merge( $this->mModules, (array)$modules );
 585         }
 586
 587         /**
 588          * Get the list of module JS to include on this page
 589          *
 590          * @param bool $filter
 591          * @param string|null $position
 592          *
 593          * @return array Array of module names
 594          */
 595         public function getModuleScripts( $filter = false, $position = null ) {
 596                 return $this->getModules( $filter, $position, 'mModuleScripts' );
 597         }
 598
 599         /**
 600          * Add only JS of one or more modules recognized by ResourceLoader. Module
 601          * scripts added through this function will be loaded by ResourceLoader when
 602          * the page loads.
 603          *
 604          * @param string|array $modules Module name (string) or array of module names
 605          */
 606         public function addModuleScripts( $modules ) {
 607                 $this->mModuleScripts = array_merge( $this->mModuleScripts, (array)$modules );
 608         }
 609
 610         /**
 611          * Get the list of module CSS to include on this page
 612          *
 613          * @param bool $filter
 614          * @param string|null $position
 615          *
 616          * @return array Array of module names
 617          */
 618         public function getModuleStyles( $filter = false, $position = null ) {
 619                 return $this->getModules( $filter, $position, 'mModuleStyles' );
 620         }
 621
 622         /**
 623          * Add only CSS of one or more modules recognized by ResourceLoader.
 624          *
 625          * Module styles added through this function will be added using standard link CSS
 626          * tags, rather than as a combined Javascript and CSS package. Thus, they will
 627          * load when JavaScript is disabled (unless CSS also happens to be disabled).
 628          *
 629          * @param string|array $modules Module name (string) or array of module names
 630          */
 631         public function addModuleStyles( $modules ) {
 632                 $this->mModuleStyles = array_merge( $this->mModuleStyles, (array)$modules );
 633         }
 634
 635         /**
 636          * Get the list of module messages to include on this page
 637          *
 638          * @deprecated since 1.26 Obsolete
 639          * @param bool $filter
 640          * @param string|null $position
 641          * @return array Array of module names
 642          */
 643         public function getModuleMessages( $filter = false, $position = null ) {
 644                 wfDeprecated( __METHOD__, '1.26' );
 645                 return array();
 646         }
 647
 648         /**
 649          * Load messages of one or more ResourceLoader modules.
 650          *
 651          * @deprecated since 1.26 Use addModules() instead
 652          * @param string|array $modules Module name (string) or array of module names
 653          */
 654         public function addModuleMessages( $modules ) {
 655                 wfDeprecated( __METHOD__, '1.26' );
 656         }
 657
 658         /**
 659          * @return null|string ResourceLoader target
 660          */
 661         public function getTarget() {
 662                 return $this->mTarget;
 663         }
 664
 665         /**
 666          * Sets ResourceLoader target for load.php links. If null, will be omitted
 667          *
 668          * @param string|null $target
 669          */
 670         public function setTarget( $target ) {
 671                 $this->mTarget = $target;
 672         }
 673
 674         /**
 675          * Get an array of head items
 676          *
 677          * @return array
 678          */
 679         function getHeadItemsArray() {
 680                 return $this->mHeadItems;
 681         }
 682
 683         /**
 684          * Get all header items in a string
 685          *
 686          * @return string
 687          * @deprecated since 1.24 Use OutputPage::headElement or
 688          *   if absolutely necessary use OutputPage::getHeadItemsArray
 689          */
 690         function getHeadItems() {
 691                 wfDeprecated( __METHOD__, '1.24' );
 692                 $s = '';
 693                 foreach ( $this->mHeadItems as $item ) {
 694                         $s .= $item;
 695                 }
 696                 return $s;
 697         }
 698
 699         /**
 700          * Add or replace an header item to the output
 701          *
 702          * Whenever possible, use more specific options like ResourceLoader modules,
 703          * OutputPage::addLink(), OutputPage::addMetaLink() and OutputPage::addFeedLink()
 704          * Fallback options for those are: OutputPage::addStyle, OutputPage::addScript(),
 705          * OutputPage::addInlineScript() and OutputPage::addInlineStyle()
 706          * This would be your very LAST fallback.
 707          *
 708          * @param string $name Item name
 709          * @param string $value Raw HTML
 710          */
 711         public function addHeadItem( $name, $value ) {
 712                 $this->mHeadItems[$name] = $value;
 713         }
 714
 715         /**
 716          * Check if the header item $name is already set
 717          *
 718          * @param string $name Item name
 719          * @return bool
 720          */
 721         public function hasHeadItem( $name ) {
 722                 return isset( $this->mHeadItems[$name] );
 723         }
 724
 725         /**
 726          * Set the value of the ETag HTTP header, only used if $wgUseETag is true
 727          *
 728          * @param string $tag Value of "ETag" header
 729          */
 730         function setETag( $tag ) {
 731                 $this->mETag = $tag;
 732         }
 733
 734         /**
 735          * Set whether the output should only contain the body of the article,
 736          * without any skin, sidebar, etc.
 737          * Used e.g. when calling with "action=render".
 738          *
 739          * @param bool $only Whether to output only the body of the article
 740          */
 741         public function setArticleBodyOnly( $only ) {
 742                 $this->mArticleBodyOnly = $only;
 743         }
 744
 745         /**
 746          * Return whether the output will contain only the body of the article
 747          *
 748          * @return bool
 749          */
 750         public function getArticleBodyOnly() {
 751                 return $this->mArticleBodyOnly;
 752         }
 753
 754         /**
 755          * Set an additional output property
 756          * @since 1.21
 757          *
 758          * @param string $name
 759          * @param mixed $value
 760          */
 761         public function setProperty( $name, $value ) {
 762                 $this->mProperties[$name] = $value;
 763         }
 764
 765         /**
 766          * Get an additional output property
 767          * @since 1.21
 768          *
 769          * @param string $name
 770          * @return mixed Property value or null if not found
 771          */
 772         public function getProperty( $name ) {
 773                 if ( isset( $this->mProperties[$name] ) ) {
 774                         return $this->mProperties[$name];
 775                 } else {
 776                         return null;
 777                 }
 778         }
 779
 780         /**
 781          * checkLastModified tells the client to use the client-cached page if
 782          * possible. If successful, the OutputPage is disabled so that
 783          * any future call to OutputPage->output() have no effect.
 784          *
 785          * Side effect: sets mLastModified for Last-Modified header
 786          *
 787          * @param string $timestamp
 788          *
 789          * @return bool True if cache-ok headers was sent.
 790          */
 791         public function checkLastModified( $timestamp ) {
 792                 if ( !$timestamp || $timestamp == '19700101000000' ) {
 793                         wfDebug( __METHOD__ . ": CACHE DISABLED, NO TIMESTAMP\n" );
 794                         return false;
 795                 }
 796                 $config = $this->getConfig();
 797                 if ( !$config->get( 'CachePages' ) ) {
 798                         wfDebug( __METHOD__ . ": CACHE DISABLED\n" );
 799                         return false;
 800                 }
 801
 802                 $timestamp = wfTimestamp( TS_MW, $timestamp );
 803                 $modifiedTimes = array(
 804                         'page' => $timestamp,
 805                         'user' => $this->getUser()->getTouched(),
 806                         'epoch' => $config->get( 'CacheEpoch' )
 807                 );
 808                 if ( $config->get( 'UseSquid' ) ) {
 809                         // bug 44570: the core page itself may not change, but resources might
 810                         $modifiedTimes['sepoch'] = wfTimestamp( TS_MW, time() - $config->get( 'SquidMaxage' ) );
 811                 }
 812                 Hooks::run( 'OutputPageCheckLastModified', array( &$modifiedTimes ) );
 813
 814                 $maxModified = max( $modifiedTimes );
 815                 $this->mLastModified = wfTimestamp( TS_RFC2822, $maxModified );
 816
 817                 $clientHeader = $this->getRequest()->getHeader( 'If-Modified-Since' );
 818                 if ( $clientHeader === false ) {
 819                         wfDebug( __METHOD__ . ": client did not send If-Modified-Since header\n", 'log' );
 820                         return false;
 821                 }
 822
 823                 # IE sends sizes after the date like this:
 824                 # Wed, 20 Aug 2003 06:51:19 GMT; length=5202
 825                 # this breaks strtotime().
 826                 $clientHeader = preg_replace( '/;.*$/', '', $clientHeader );
 827
 828                 MediaWiki\suppressWarnings(); // E_STRICT system time bitching
 829                 $clientHeaderTime = strtotime( $clientHeader );
 830                 MediaWiki\restoreWarnings();
 831                 if ( !$clientHeaderTime ) {
 832                         wfDebug( __METHOD__
 833                                 . ": unable to parse the client's If-Modified-Since header: $clientHeader\n" );
 834                         return false;
 835                 }
 836                 $clientHeaderTime = wfTimestamp( TS_MW, $clientHeaderTime );
 837
 838                 # Make debug info
 839                 $info = '';
 840                 foreach ( $modifiedTimes as $name => $value ) {
 841                         if ( $info !== '' ) {
 842                                 $info .= ', ';
 843                         }
 844                         $info .= "$name=" . wfTimestamp( TS_ISO_8601, $value );
 845                 }
 846
 847                 wfDebug( __METHOD__ . ": client sent If-Modified-Since: " .
 848                         wfTimestamp( TS_ISO_8601, $clientHeaderTime ) . "\n", 'log' );
 849                 wfDebug( __METHOD__ . ": effective Last-Modified: " .
 850                         wfTimestamp( TS_ISO_8601, $maxModified ) . "\n", 'log' );
 851                 if ( $clientHeaderTime < $maxModified ) {
 852                         wfDebug( __METHOD__ . ": STALE, $info\n", 'log' );
 853                         return false;
 854                 }
 855
 856                 # Not modified
 857                 # Give a 304 Not Modified response code and disable body output
 858                 wfDebug( __METHOD__ . ": NOT MODIFIED, $info\n", 'log' );
 859                 ini_set( 'zlib.output_compression', 0 );
 860                 $this->getRequest()->response()->statusHeader( 304 );
 861                 $this->sendCacheControl();
 862                 $this->disable();
 863
 864                 // Don't output a compressed blob when using ob_gzhandler;
 865                 // it's technically against HTTP spec and seems to confuse
 866                 // Firefox when the response gets split over two packets.
 867                 wfClearOutputBuffers();
 868
 869                 return true;
 870         }
 871
 872         /**
 873          * Override the last modified timestamp
 874          *
 875          * @param string $timestamp New timestamp, in a format readable by
 876          *        wfTimestamp()
 877          */
 878         public function setLastModified( $timestamp ) {
 879                 $this->mLastModified = wfTimestamp( TS_RFC2822, $timestamp );
 880         }
 881
 882         /**
 883          * Set the robot policy for the page: <http://www.robotstxt.org/meta.html>
 884          *
 885          * @param string $policy The literal string to output as the contents of
 886          *   the meta tag.  Will be parsed according to the spec and output in
 887          *   standardized form.
 888          * @return null
 889          */
 890         public function setRobotPolicy( $policy ) {
 891                 $policy = Article::formatRobotPolicy( $policy );
 892
 893                 if ( isset( $policy['index'] ) ) {
 894                         $this->setIndexPolicy( $policy['index'] );
 895                 }
 896                 if ( isset( $policy['follow'] ) ) {
 897                         $this->setFollowPolicy( $policy['follow'] );
 898                 }
 899         }
 900
 901         /**
 902          * Set the index policy for the page, but leave the follow policy un-
 903          * touched.
 904          *
 905          * @param string $policy Either 'index' or 'noindex'.
 906          * @return null
 907          */
 908         public function setIndexPolicy( $policy ) {
 909                 $policy = trim( $policy );
 910                 if ( in_array( $policy, array( 'index', 'noindex' ) ) ) {
 911                         $this->mIndexPolicy = $policy;
 912                 }
 913         }
 914
 915         /**
 916          * Set the follow policy for the page, but leave the index policy un-
 917          * touched.
 918          *
 919          * @param string $policy Either 'follow' or 'nofollow'.
 920          * @return null
 921          */
 922         public function setFollowPolicy( $policy ) {
 923                 $policy = trim( $policy );
 924                 if ( in_array( $policy, array( 'follow', 'nofollow' ) ) ) {
 925                         $this->mFollowPolicy = $policy;
 926                 }
 927         }
 928
 929         /**
 930          * Set the new value of the "action text", this will be added to the
 931          * "HTML title", separated from it with " - ".
 932          *
 933          * @param string $text New value of the "action text"
 934          */
 935         public function setPageTitleActionText( $text ) {
 936                 $this->mPageTitleActionText = $text;
 937         }
 938
 939         /**
 940          * Get the value of the "action text"
 941          *
 942          * @return string
 943          */
 944         public function getPageTitleActionText() {
 945                 return $this->mPageTitleActionText;
 946         }
 947
 948         /**
 949          * "HTML title" means the contents of "<title>".
 950          * It is stored as plain, unescaped text and will be run through htmlspecialchars in the skin file.
 951          *
 952          * @param string|Message $name
 953          */
 954         public function setHTMLTitle( $name ) {
 955                 if ( $name instanceof Message ) {
 956                         $this->mHTMLtitle = $name->setContext( $this->getContext() )->text();
 957                 } else {
 958                         $this->mHTMLtitle = $name;
 959                 }
 960         }
 961
 962         /**
 963          * Return the "HTML title", i.e. the content of the "<title>" tag.
 964          *
 965          * @return string
 966          */
 967         public function getHTMLTitle() {
 968                 return $this->mHTMLtitle;
 969         }
 970
 971         /**
 972          * Set $mRedirectedFrom, the Title of the page which redirected us to the current page.
 973          *
 974          * @param Title $t
 975          */
 976         public function setRedirectedFrom( $t ) {
 977                 $this->mRedirectedFrom = $t;
 978         }
 979
 980         /**
 981          * "Page title" means the contents of \<h1\>. It is stored as a valid HTML
 982          * fragment. This function allows good tags like \<sup\> in the \<h1\> tag,
 983          * but not bad tags like \<script\>. This function automatically sets
 984          * \<title\> to the same content as \<h1\> but with all tags removed. Bad
 985          * tags that were escaped in \<h1\> will still be escaped in \<title\>, and
 986          * good tags like \<i\> will be dropped entirely.
 987          *
 988          * @param string|Message $name
 989          */
 990         public function setPageTitle( $name ) {
 991                 if ( $name instanceof Message ) {
 992                         $name = $name->setContext( $this->getContext() )->text();
 993                 }
 994
 995                 # change "<script>foo&bar</script>" to "&lt;script&gt;foo&amp;bar&lt;/script&gt;"
 996                 # but leave "<i>foobar</i>" alone
 997                 $nameWithTags = Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags( $name ) );
 998                 $this->mPagetitle = $nameWithTags;
 999
1000                 # change "<i>foo&amp;bar</i>" to "foo&bar"
1001                 $this->setHTMLTitle(
1002                         $this->msg( 'pagetitle' )->rawParams( Sanitizer::stripAllTags( $nameWithTags ) )
1003                                 ->inContentLanguage()
1004                 );
1005         }
1006
1007         /**
1008          * Return the "page title", i.e. the content of the \<h1\> tag.
1009          *
1010          * @return string
1011          */
1012         public function getPageTitle() {
1013                 return $this->mPagetitle;
1014         }
1015
1016         /**
1017          * Set the Title object to use
1018          *
1019          * @param Title $t
1020          */
1021         public function setTitle( Title $t ) {
1022                 $this->getContext()->setTitle( $t );
1023         }
1024
1025         /**
1026          * Replace the subtitle with $str
1027          *
1028          * @param string|Message $str New value of the subtitle. String should be safe HTML.
1029          */
1030         public function setSubtitle( $str ) {
1031                 $this->clearSubtitle();
1032                 $this->addSubtitle( $str );
1033         }
1034
1035         /**
1036          * Add $str to the subtitle
1037          *
1038          * @param string|Message $str String or Message to add to the subtitle. String should be safe HTML.
1039          */
1040         public function addSubtitle( $str ) {
1041                 if ( $str instanceof Message ) {
1042                         $this->mSubtitle[] = $str->setContext( $this->getContext() )->parse();
1043                 } else {
1044                         $this->mSubtitle[] = $str;
1045                 }
1046         }
1047
1048         /**
1049          * Build message object for a subtitle containing a backlink to a page
1050          *
1051          * @param Title $title Title to link to
1052          * @param array $query Array of additional parameters to include in the link
1053          * @return Message
1054          * @since 1.25
1055          */
1056         public static function buildBacklinkSubtitle( Title $title, $query = array() ) {
1057                 if ( $title->isRedirect() ) {
1058                         $query['redirect'] = 'no';
1059                 }
1060                 return wfMessage( 'backlinksubtitle' )
1061                         ->rawParams( Linker::link( $title, null, array(), $query ) );
1062         }
1063
1064         /**
1065          * Add a subtitle containing a backlink to a page
1066          *
1067          * @param Title $title Title to link to
1068          * @param array $query Array of additional parameters to include in the link
1069          */
1070         public function addBacklinkSubtitle( Title $title, $query = array() ) {
1071                 $this->addSubtitle( self::buildBacklinkSubtitle( $title, $query ) );
1072         }
1073
1074         /**
1075          * Clear the subtitles
1076          */
1077         public function clearSubtitle() {
1078                 $this->mSubtitle = array();
1079         }
1080
1081         /**
1082          * Get the subtitle
1083          *
1084          * @return string
1085          */
1086         public function getSubtitle() {
1087                 return implode( "<br />\n\t\t\t\t", $this->mSubtitle );
1088         }
1089
1090         /**
1091          * Set the page as printable, i.e. it'll be displayed with all
1092          * print styles included
1093          */
1094         public function setPrintable() {
1095                 $this->mPrintable = true;
1096         }
1097
1098         /**
1099          * Return whether the page is "printable"
1100          *
1101          * @return bool
1102          */
1103         public function isPrintable() {
1104                 return $this->mPrintable;
1105         }
1106
1107         /**
1108          * Disable output completely, i.e. calling output() will have no effect
1109          */
1110         public function disable() {
1111                 $this->mDoNothing = true;
1112         }
1113
1114         /**
1115          * Return whether the output will be completely disabled
1116          *
1117          * @return bool
1118          */
1119         public function isDisabled() {
1120                 return $this->mDoNothing;
1121         }
1122
1123         /**
1124          * Show an "add new section" link?
1125          *
1126          * @return bool
1127          */
1128         public function showNewSectionLink() {
1129                 return $this->mNewSectionLink;
1130         }
1131
1132         /**
1133          * Forcibly hide the new section link?
1134          *
1135          * @return bool
1136          */
1137         public function forceHideNewSectionLink() {
1138                 return $this->mHideNewSectionLink;
1139         }
1140
1141         /**
1142          * Add or remove feed links in the page header
1143          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
1144          * for the new version
1145          * @see addFeedLink()
1146          *
1147          * @param bool $show True: add default feeds, false: remove all feeds
1148          */
1149         public function setSyndicated( $show = true ) {
1150                 if ( $show ) {
1151                         $this->setFeedAppendQuery( false );
1152                 } else {
1153                         $this->mFeedLinks = array();
1154                 }
1155         }
1156
1157         /**
1158          * Add default feeds to the page header
1159          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
1160          * for the new version
1161          * @see addFeedLink()
1162          *
1163          * @param string $val Query to append to feed links or false to output
1164          *        default links
1165          */
1166         public function setFeedAppendQuery( $val ) {
1167                 $this->mFeedLinks = array();
1168
1169                 foreach ( $this->getConfig()->get( 'AdvertisedFeedTypes' ) as $type ) {
1170                         $query = "feed=$type";
1171                         if ( is_string( $val ) ) {
1172                                 $query .= '&' . $val;
1173                         }
1174                         $this->mFeedLinks[$type] = $this->getTitle()->getLocalURL( $query );
1175                 }
1176         }
1177
1178         /**
1179          * Add a feed link to the page header
1180          *
1181          * @param string $format Feed type, should be a key of $wgFeedClasses
1182          * @param string $href URL
1183          */
1184         public function addFeedLink( $format, $href ) {
1185                 if ( in_array( $format, $this->getConfig()->get( 'AdvertisedFeedTypes' ) ) ) {
1186                         $this->mFeedLinks[$format] = $href;
1187                 }
1188         }
1189
1190         /**
1191          * Should we output feed links for this page?
1192          * @return bool
1193          */
1194         public function isSyndicated() {
1195                 return count( $this->mFeedLinks ) > 0;
1196         }
1197
1198         /**
1199          * Return URLs for each supported syndication format for this page.
1200          * @return array Associating format keys with URLs
1201          */
1202         public function getSyndicationLinks() {
1203                 return $this->mFeedLinks;
1204         }
1205
1206         /**
1207          * Will currently always return null
1208          *
1209          * @return null
1210          */
1211         public function getFeedAppendQuery() {
1212                 return $this->mFeedLinksAppendQuery;
1213         }
1214
1215         /**
1216          * Set whether the displayed content is related to the source of the
1217          * corresponding article on the wiki
1218          * Setting true will cause the change "article related" toggle to true
1219          *
1220          * @param bool $v
1221          */
1222         public function setArticleFlag( $v ) {
1223                 $this->mIsarticle = $v;
1224                 if ( $v ) {
1225                         $this->mIsArticleRelated = $v;
1226                 }
1227         }
1228
1229         /**
1230          * Return whether the content displayed page is related to the source of
1231          * the corresponding article on the wiki
1232          *
1233          * @return bool
1234          */
1235         public function isArticle() {
1236                 return $this->mIsarticle;
1237         }
1238
1239         /**
1240          * Set whether this page is related an article on the wiki
1241          * Setting false will cause the change of "article flag" toggle to false
1242          *
1243          * @param bool $v
1244          */
1245         public function setArticleRelated( $v ) {
1246                 $this->mIsArticleRelated = $v;
1247                 if ( !$v ) {
1248                         $this->mIsarticle = false;
1249                 }
1250         }
1251
1252         /**
1253          * Return whether this page is related an article on the wiki
1254          *
1255          * @return bool
1256          */
1257         public function isArticleRelated() {
1258                 return $this->mIsArticleRelated;
1259         }
1260
1261         /**
1262          * Add new language links
1263          *
1264          * @param array $newLinkArray Associative array mapping language code to the page
1265          *                      name
1266          */
1267         public function addLanguageLinks( array $newLinkArray ) {
1268                 $this->mLanguageLinks += $newLinkArray;
1269         }
1270
1271         /**
1272          * Reset the language links and add new language links
1273          *
1274          * @param array $newLinkArray Associative array mapping language code to the page
1275          *                      name
1276          */
1277         public function setLanguageLinks( array $newLinkArray ) {
1278                 $this->mLanguageLinks = $newLinkArray;
1279         }
1280
1281         /**
1282          * Get the list of language links
1283          *
1284          * @return array Array of Interwiki Prefixed (non DB key) Titles (e.g. 'fr:Test page')
1285          */
1286         public function getLanguageLinks() {
1287                 return $this->mLanguageLinks;
1288         }
1289
1290         /**
1291          * Add an array of categories, with names in the keys
1292          *
1293          * @param array $categories Mapping category name => sort key
1294          */
1295         public function addCategoryLinks( array $categories ) {
1296                 global $wgContLang;
1297
1298                 if ( !is_array( $categories ) || count( $categories ) == 0 ) {
1299                         return;
1300                 }
1301
1302                 # Add the links to a LinkBatch
1303                 $arr = array( NS_CATEGORY => $categories );
1304                 $lb = new LinkBatch;
1305                 $lb->setArray( $arr );
1306
1307                 # Fetch existence plus the hiddencat property
1308                 $dbr = wfGetDB( DB_SLAVE );
1309                 $fields = array( 'page_id', 'page_namespace', 'page_title', 'page_len',
1310                         'page_is_redirect', 'page_latest', 'pp_value' );
1311
1312                 if ( $this->getConfig()->get( 'ContentHandlerUseDB' ) ) {
1313                         $fields[] = 'page_content_model';
1314                 }
1315
1316                 $res = $dbr->select( array( 'page', 'page_props' ),
1317                         $fields,
1318                         $lb->constructSet( 'page', $dbr ),
1319                         __METHOD__,
1320                         array(),
1321                         array( 'page_props' => array( 'LEFT JOIN', array(
1322                                 'pp_propname' => 'hiddencat',
1323                                 'pp_page = page_id'
1324                         ) ) )
1325                 );
1326
1327                 # Add the results to the link cache
1328                 $lb->addResultToCache( LinkCache::singleton(), $res );
1329
1330                 # Set all the values to 'normal'.
1331                 $categories = array_fill_keys( array_keys( $categories ), 'normal' );
1332
1333                 # Mark hidden categories
1334                 foreach ( $res as $row ) {
1335                         if ( isset( $row->pp_value ) ) {
1336                                 $categories[$row->page_title] = 'hidden';
1337                         }
1338                 }
1339
1340                 # Add the remaining categories to the skin
1341                 if ( Hooks::run(
1342                         'OutputPageMakeCategoryLinks',
1343                         array( &$this, $categories, &$this->mCategoryLinks ) )
1344                 ) {
1345                         foreach ( $categories as $category => $type ) {
1346                                 // array keys will cast numeric category names to ints, so cast back to string
1347                                 $category = (string)$category;
1348                                 $origcategory = $category;
1349                                 $title = Title::makeTitleSafe( NS_CATEGORY, $category );
1350                                 if ( !$title ) {
1351                                         continue;
1352                                 }
1353                                 $wgContLang->findVariantLink( $category, $title, true );
1354                                 if ( $category != $origcategory && array_key_exists( $category, $categories ) ) {
1355                                         continue;
1356                                 }
1357                                 $text = $wgContLang->convertHtml( $title->getText() );
1358                                 $this->mCategories[] = $title->getText();
1359                                 $this->mCategoryLinks[$type][] = Linker::link( $title, $text );
1360                         }
1361                 }
1362         }
1363
1364         /**
1365          * Reset the category links (but not the category list) and add $categories
1366          *
1367          * @param array $categories Mapping category name => sort key
1368          */
1369         public function setCategoryLinks( array $categories ) {
1370                 $this->mCategoryLinks = array();
1371                 $this->addCategoryLinks( $categories );
1372         }
1373
1374         /**
1375          * Get the list of category links, in a 2-D array with the following format:
1376          * $arr[$type][] = $link, where $type is either "normal" or "hidden" (for
1377          * hidden categories) and $link a HTML fragment with a link to the category
1378          * page
1379          *
1380          * @return array
1381          */
1382         public function getCategoryLinks() {
1383                 return $this->mCategoryLinks;
1384         }
1385
1386         /**
1387          * Get the list of category names this page belongs to
1388          *
1389          * @return array Array of strings
1390          */
1391         public function getCategories() {
1392                 return $this->mCategories;
1393         }
1394
1395         /**
1396          * Add an array of indicators, with their identifiers as array
1397          * keys and HTML contents as values.
1398          *
1399          * In case of duplicate keys, existing values are overwritten.
1400          *
1401          * @param array $indicators
1402          * @since 1.25
1403          */
1404         public function setIndicators( array $indicators ) {
1405                 $this->mIndicators = $indicators + $this->mIndicators;
1406                 // Keep ordered by key
1407                 ksort( $this->mIndicators );
1408         }
1409
1410         /**
1411          * Get the indicators associated with this page.
1412          *
1413          * The array will be internally ordered by item keys.
1414          *
1415          * @return array Keys: identifiers, values: HTML contents
1416          * @since 1.25
1417          */
1418         public function getIndicators() {
1419                 return $this->mIndicators;
1420         }
1421
1422         /**
1423          * Adds help link with an icon via page indicators.
1424          * Link target can be overridden by a local message containing a wikilink:
1425          * the message key is: lowercase action or special page name + '-helppage'.
1426          * @param string $to Target MediaWiki.org page title or encoded URL.
1427          * @param bool $overrideBaseUrl Whether $url is a full URL, to avoid MW.o.
1428          * @since 1.25
1429          */
1430         public function addHelpLink( $to, $overrideBaseUrl = false ) {
1431                 $this->addModuleStyles( 'mediawiki.helplink' );
1432                 $text = $this->msg( 'helppage-top-gethelp' )->escaped();
1433
1434                 if ( $overrideBaseUrl ) {
1435                         $helpUrl = $to;
1436                 } else {
1437                         $toUrlencoded = wfUrlencode( str_replace( ' ', '_', $to ) );
1438                         $helpUrl = "//www.mediawiki.org/wiki/Special:MyLanguage/$toUrlencoded";
1439                 }
1440
1441                 $link = Html::rawElement(
1442                         'a',
1443                         array(
1444                                 'href' => $helpUrl,
1445                                 'target' => '_blank',
1446                                 'class' => 'mw-helplink',
1447                         ),
1448                         $text
1449                 );
1450
1451                 $this->setIndicators( array( 'mw-helplink' => $link ) );
1452         }
1453
1454         /**
1455          * Do not allow scripts which can be modified by wiki users to load on this page;
1456          * only allow scripts bundled with, or generated by, the software.
1457          * Site-wide styles are controlled by a config setting, since they can be
1458          * used to create a custom skin/theme, but not user-specific ones.
1459          *
1460          * @todo this should be given a more accurate name
1461          */
1462         public function disallowUserJs() {
1463                 $this->reduceAllowedModules(
1464                         ResourceLoaderModule::TYPE_SCRIPTS,
1465                         ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL
1466                 );
1467
1468                 // Site-wide styles are controlled by a config setting, see bug 71621
1469                 // for background on why. User styles are never allowed.
1470                 if ( $this->getConfig()->get( 'AllowSiteCSSOnRestrictedPages' ) ) {
1471                         $styleOrigin = ResourceLoaderModule::ORIGIN_USER_SITEWIDE;
1472                 } else {
1473                         $styleOrigin = ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL;
1474                 }
1475                 $this->reduceAllowedModules(
1476                         ResourceLoaderModule::TYPE_STYLES,
1477                         $styleOrigin
1478                 );
1479         }
1480
1481         /**
1482          * Show what level of JavaScript / CSS untrustworthiness is allowed on this page
1483          * @see ResourceLoaderModule::$origin
1484          * @param string $type ResourceLoaderModule TYPE_ constant
1485          * @return int ResourceLoaderModule ORIGIN_ class constant
1486          */
1487         public function getAllowedModules( $type ) {
1488                 if ( $type == ResourceLoaderModule::TYPE_COMBINED ) {
1489                         return min( array_values( $this->mAllowedModules ) );
1490                 } else {
1491                         return isset( $this->mAllowedModules[$type] )
1492                                 ? $this->mAllowedModules[$type]
1493                                 : ResourceLoaderModule::ORIGIN_ALL;
1494                 }
1495         }
1496
1497         /**
1498          * Set the highest level of CSS/JS untrustworthiness allowed
1499          *
1500          * @deprecated since 1.24 Raising level of allowed untrusted content is no longer supported.
1501          *  Use reduceAllowedModules() instead
1502          * @param string $type ResourceLoaderModule TYPE_ constant
1503          * @param int $level ResourceLoaderModule class constant
1504          */
1505         public function setAllowedModules( $type, $level ) {
1506                 wfDeprecated( __METHOD__, '1.24' );
1507                 $this->reduceAllowedModules( $type, $level );
1508         }
1509
1510         /**
1511          * Limit the highest level of CSS/JS untrustworthiness allowed.
1512          *
1513          * If passed the same or a higher level than the current level of untrustworthiness set, the
1514          * level will remain unchanged.
1515          *
1516          * @param string $type
1517          * @param int $level ResourceLoaderModule class constant
1518          */
1519         public function reduceAllowedModules( $type, $level ) {
1520                 $this->mAllowedModules[$type] = min( $this->getAllowedModules( $type ), $level );
1521         }
1522
1523         /**
1524          * Prepend $text to the body HTML
1525          *
1526          * @param string $text HTML
1527          */
1528         public function prependHTML( $text ) {
1529                 $this->mBodytext = $text . $this->mBodytext;
1530         }
1531
1532         /**
1533          * Append $text to the body HTML
1534          *
1535          * @param string $text HTML
1536          */
1537         public function addHTML( $text ) {
1538                 $this->mBodytext .= $text;
1539         }
1540
1541         /**
1542          * Shortcut for adding an Html::element via addHTML.
1543          *
1544          * @since 1.19
1545          *
1546          * @param string $element
1547          * @param array $attribs
1548          * @param string $contents
1549          */
1550         public function addElement( $element, array $attribs = array(), $contents = '' ) {
1551                 $this->addHTML( Html::element( $element, $attribs, $contents ) );
1552         }
1553
1554         /**
1555          * Clear the body HTML
1556          */
1557         public function clearHTML() {
1558                 $this->mBodytext = '';
1559         }
1560
1561         /**
1562          * Get the body HTML
1563          *
1564          * @return string HTML
1565          */
1566         public function getHTML() {
1567                 return $this->mBodytext;
1568         }
1569
1570         /**
1571          * Get/set the ParserOptions object to use for wikitext parsing
1572          *
1573          * @param ParserOptions|null $options Either the ParserOption to use or null to only get the
1574          *   current ParserOption object
1575          * @return ParserOptions
1576          */
1577         public function parserOptions( $options = null ) {
1578                 if ( !$this->mParserOptions ) {
1579                         $this->mParserOptions = ParserOptions::newFromContext( $this->getContext() );
1580                         $this->mParserOptions->setEditSection( false );
1581                 }
1582                 return wfSetVar( $this->mParserOptions, $options );
1583         }
1584
1585         /**
1586          * Set the revision ID which will be seen by the wiki text parser
1587          * for things such as embedded {{REVISIONID}} variable use.
1588          *
1589          * @param int|null $revid An positive integer, or null
1590          * @return mixed Previous value
1591          */
1592         public function setRevisionId( $revid ) {
1593                 $val = is_null( $revid ) ? null : intval( $revid );
1594                 return wfSetVar( $this->mRevisionId, $val );
1595         }
1596
1597         /**
1598          * Get the displayed revision ID
1599          *
1600          * @return int
1601          */
1602         public function getRevisionId() {
1603                 return $this->mRevisionId;
1604         }
1605
1606         /**
1607          * Set the timestamp of the revision which will be displayed. This is used
1608          * to avoid a extra DB call in Skin::lastModified().
1609          *
1610          * @param string|null $timestamp
1611          * @return mixed Previous value
1612          */
1613         public function setRevisionTimestamp( $timestamp ) {
1614                 return wfSetVar( $this->mRevisionTimestamp, $timestamp );
1615         }
1616
1617         /**
1618          * Get the timestamp of displayed revision.
1619          * This will be null if not filled by setRevisionTimestamp().
1620          *
1621          * @return string|null
1622          */
1623         public function getRevisionTimestamp() {
1624                 return $this->mRevisionTimestamp;
1625         }
1626
1627         /**
1628          * Set the displayed file version
1629          *
1630          * @param File|bool $file
1631          * @return mixed Previous value
1632          */
1633         public function setFileVersion( $file ) {
1634                 $val = null;
1635                 if ( $file instanceof File && $file->exists() ) {
1636                         $val = array( 'time' => $file->getTimestamp(), 'sha1' => $file->getSha1() );
1637                 }
1638                 return wfSetVar( $this->mFileVersion, $val, true );
1639         }
1640
1641         /**
1642          * Get the displayed file version
1643          *
1644          * @return array|null ('time' => MW timestamp, 'sha1' => sha1)
1645          */
1646         public function getFileVersion() {
1647                 return $this->mFileVersion;
1648         }
1649
1650         /**
1651          * Get the templates used on this page
1652          *
1653          * @return array (namespace => dbKey => revId)
1654          * @since 1.18
1655          */
1656         public function getTemplateIds() {
1657                 return $this->mTemplateIds;
1658         }
1659
1660         /**
1661          * Get the files used on this page
1662          *
1663          * @return array (dbKey => array('time' => MW timestamp or null, 'sha1' => sha1 or ''))
1664          * @since 1.18
1665          */
1666         public function getFileSearchOptions() {
1667                 return $this->mImageTimeKeys;
1668         }
1669
1670         /**
1671          * Convert wikitext to HTML and add it to the buffer
1672          * Default assumes that the current page title will be used.
1673          *
1674          * @param string $text
1675          * @param bool $linestart Is this the start of a line?
1676          * @param bool $interface Is this text in the user interface language?
1677          * @throws MWException
1678          */
1679         public function addWikiText( $text, $linestart = true, $interface = true ) {
1680                 $title = $this->getTitle(); // Work around E_STRICT
1681                 if ( !$title ) {
1682                         throw new MWException( 'Title is null' );
1683                 }
1684                 $this->addWikiTextTitle( $text, $title, $linestart, /*tidy*/false, $interface );
1685         }
1686
1687         /**
1688          * Add wikitext with a custom Title object
1689          *
1690          * @param string $text Wikitext
1691          * @param Title $title
1692          * @param bool $linestart Is this the start of a line?
1693          */
1694         public function addWikiTextWithTitle( $text, &$title, $linestart = true ) {
1695                 $this->addWikiTextTitle( $text, $title, $linestart );
1696         }
1697
1698         /**
1699          * Add wikitext with a custom Title object and tidy enabled.
1700          *
1701          * @param string $text Wikitext
1702          * @param Title $title
1703          * @param bool $linestart Is this the start of a line?
1704          */
1705         function addWikiTextTitleTidy( $text, &$title, $linestart = true ) {
1706                 $this->addWikiTextTitle( $text, $title, $linestart, true );
1707         }
1708
1709         /**
1710          * Add wikitext with tidy enabled
1711          *
1712          * @param string $text Wikitext
1713          * @param bool $linestart Is this the start of a line?
1714          */
1715         public function addWikiTextTidy( $text, $linestart = true ) {
1716                 $title = $this->getTitle();
1717                 $this->addWikiTextTitleTidy( $text, $title, $linestart );
1718         }
1719
1720         /**
1721          * Add wikitext with a custom Title object
1722          *
1723          * @param string $text Wikitext
1724          * @param Title $title
1725          * @param bool $linestart Is this the start of a line?
1726          * @param bool $tidy Whether to use tidy
1727          * @param bool $interface Whether it is an interface message
1728          *   (for example disables conversion)
1729          */
1730         public function addWikiTextTitle( $text, Title $title, $linestart,
1731                 $tidy = false, $interface = false
1732         ) {
1733                 global $wgParser;
1734
1735                 $popts = $this->parserOptions();
1736                 $oldTidy = $popts->setTidy( $tidy );
1737                 $popts->setInterfaceMessage( (bool)$interface );
1738
1739                 $parserOutput = $wgParser->getFreshParser()->parse(
1740                         $text, $title, $popts,
1741                         $linestart, true, $this->mRevisionId
1742                 );
1743
1744                 $popts->setTidy( $oldTidy );
1745
1746                 $this->addParserOutput( $parserOutput );
1747
1748         }
1749
1750         /**
1751          * Add a ParserOutput object, but without Html.
1752          *
1753          * @deprecated since 1.24, use addParserOutputMetadata() instead.
1754          * @param ParserOutput $parserOutput
1755          */
1756         public function addParserOutputNoText( $parserOutput ) {
1757                 wfDeprecated( __METHOD__, '1.24' );
1758                 $this->addParserOutputMetadata( $parserOutput );
1759         }
1760
1761         /**
1762          * Add all metadata associated with a ParserOutput object, but without the actual HTML. This
1763          * includes categories, language links, ResourceLoader modules, effects of certain magic words,
1764          * and so on.
1765          *
1766          * @since 1.24
1767          * @param ParserOutput $parserOutput
1768          */
1769         public function addParserOutputMetadata( $parserOutput ) {
1770                 $this->mLanguageLinks += $parserOutput->getLanguageLinks();
1771                 $this->addCategoryLinks( $parserOutput->getCategories() );
1772                 $this->setIndicators( $parserOutput->getIndicators() );
1773                 $this->mNewSectionLink = $parserOutput->getNewSection();
1774                 $this->mHideNewSectionLink = $parserOutput->getHideNewSection();
1775
1776                 $this->mParseWarnings = $parserOutput->getWarnings();
1777                 if ( !$parserOutput->isCacheable() ) {
1778                         $this->enableClientCache( false );
1779                 }
1780                 $this->mNoGallery = $parserOutput->getNoGallery();
1781                 $this->mHeadItems = array_merge( $this->mHeadItems, $parserOutput->getHeadItems() );
1782                 $this->addModules( $parserOutput->getModules() );
1783                 $this->addModuleScripts( $parserOutput->getModuleScripts() );
1784                 $this->addModuleStyles( $parserOutput->getModuleStyles() );
1785                 $this->addJsConfigVars( $parserOutput->getJsConfigVars() );
1786                 $this->mPreventClickjacking = $this->mPreventClickjacking
1787                         || $parserOutput->preventClickjacking();
1788
1789                 // Template versioning...
1790                 foreach ( (array)$parserOutput->getTemplateIds() as $ns => $dbks ) {
1791                         if ( isset( $this->mTemplateIds[$ns] ) ) {
1792                                 $this->mTemplateIds[$ns] = $dbks + $this->mTemplateIds[$ns];
1793                         } else {
1794                                 $this->mTemplateIds[$ns] = $dbks;
1795                         }
1796                 }
1797                 // File versioning...
1798                 foreach ( (array)$parserOutput->getFileSearchOptions() as $dbk => $data ) {
1799                         $this->mImageTimeKeys[$dbk] = $data;
1800                 }
1801
1802                 // Hooks registered in the object
1803                 $parserOutputHooks = $this->getConfig()->get( 'ParserOutputHooks' );
1804                 foreach ( $parserOutput->getOutputHooks() as $hookInfo ) {
1805                         list( $hookName, $data ) = $hookInfo;
1806                         if ( isset( $parserOutputHooks[$hookName] ) ) {
1807                                 call_user_func( $parserOutputHooks[$hookName], $this, $parserOutput, $data );
1808                         }
1809                 }
1810
1811                 // enable OOUI if requested via ParserOutput
1812                 if ( $parserOutput->getEnableOOUI() ) {
1813                         $this->enableOOUI();
1814                 }
1815
1816                 // Link flags are ignored for now, but may in the future be
1817                 // used to mark individual language links.
1818                 $linkFlags = array();
1819                 Hooks::run( 'LanguageLinks', array( $this->getTitle(), &$this->mLanguageLinks, &$linkFlags ) );
1820                 Hooks::run( 'OutputPageParserOutput', array( &$this, $parserOutput ) );
1821         }
1822
1823         /**
1824          * Add the HTML and enhancements for it (like ResourceLoader modules) associated with a
1825          * ParserOutput object, without any other metadata.
1826          *
1827          * @since 1.24
1828          * @param ParserOutput $parserOutput
1829          */
1830         public function addParserOutputContent( $parserOutput ) {
1831                 $this->addParserOutputText( $parserOutput );
1832
1833                 $this->addModules( $parserOutput->getModules() );
1834                 $this->addModuleScripts( $parserOutput->getModuleScripts() );
1835                 $this->addModuleStyles( $parserOutput->getModuleStyles() );
1836
1837                 $this->addJsConfigVars( $parserOutput->getJsConfigVars() );
1838         }
1839
1840         /**
1841          * Add the HTML associated with a ParserOutput object, without any metadata.
1842          *
1843          * @since 1.24
1844          * @param ParserOutput $parserOutput
1845          */
1846         public function addParserOutputText( $parserOutput ) {
1847                 $text = $parserOutput->getText();
1848                 Hooks::run( 'OutputPageBeforeHTML', array( &$this, &$text ) );
1849                 $this->addHTML( $text );
1850         }
1851
1852         /**
1853          * Add everything from a ParserOutput object.
1854          *
1855          * @param ParserOutput $parserOutput
1856          */
1857         function addParserOutput( $parserOutput ) {
1858                 $this->addParserOutputMetadata( $parserOutput );
1859                 $parserOutput->setTOCEnabled( $this->mEnableTOC );
1860
1861                 // Touch section edit links only if not previously disabled
1862                 if ( $parserOutput->getEditSectionTokens() ) {
1863                         $parserOutput->setEditSectionTokens( $this->mEnableSectionEditLinks );
1864                 }
1865
1866                 $this->addParserOutputText( $parserOutput );
1867         }
1868
1869         /**
1870          * Add the output of a QuickTemplate to the output buffer
1871          *
1872          * @param QuickTemplate $template
1873          */
1874         public function addTemplate( &$template ) {
1875                 $this->addHTML( $template->getHTML() );
1876         }
1877
1878         /**
1879          * Parse wikitext and return the HTML.
1880          *
1881          * @param string $text
1882          * @param bool $linestart Is this the start of a line?
1883          * @param bool $interface Use interface language ($wgLang instead of
1884          *   $wgContLang) while parsing language sensitive magic words like GRAMMAR and PLURAL.
1885          *   This also disables LanguageConverter.
1886          * @param Language $language Target language object, will override $interface
1887          * @throws MWException
1888          * @return string HTML
1889          */
1890         public function parse( $text, $linestart = true, $interface = false, $language = null ) {
1891                 global $wgParser;
1892
1893                 if ( is_null( $this->getTitle() ) ) {
1894                         throw new MWException( 'Empty $mTitle in ' . __METHOD__ );
1895                 }
1896
1897                 $popts = $this->parserOptions();
1898                 if ( $interface ) {
1899                         $popts->setInterfaceMessage( true );
1900                 }
1901                 if ( $language !== null ) {
1902                         $oldLang = $popts->setTargetLanguage( $language );
1903                 }
1904
1905                 $parserOutput = $wgParser->getFreshParser()->parse(
1906                         $text, $this->getTitle(), $popts,
1907                         $linestart, true, $this->mRevisionId
1908                 );
1909
1910                 if ( $interface ) {
1911                         $popts->setInterfaceMessage( false );
1912                 }
1913                 if ( $language !== null ) {
1914                         $popts->setTargetLanguage( $oldLang );
1915                 }
1916
1917                 return $parserOutput->getText();
1918         }
1919
1920         /**
1921          * Parse wikitext, strip paragraphs, and return the HTML.
1922          *
1923          * @param string $text
1924          * @param bool $linestart Is this the start of a line?
1925          * @param bool $interface Use interface language ($wgLang instead of
1926          *   $wgContLang) while parsing language sensitive magic
1927          *   words like GRAMMAR and PLURAL
1928          * @return string HTML
1929          */
1930         public function parseInline( $text, $linestart = true, $interface = false ) {
1931                 $parsed = $this->parse( $text, $linestart, $interface );
1932                 return Parser::stripOuterParagraph( $parsed );
1933         }
1934
1935         /**
1936          * @param $maxage
1937          * @deprecated since 1.27 Use setCdnMaxage() instead
1938          */
1939         public function setSquidMaxage( $maxage ) {
1940                 $this->setCdnMaxage( $maxage );
1941         }
1942
1943         /**
1944          * Set the value of the "s-maxage" part of the "Cache-control" HTTP header
1945          *
1946          * @param int $maxage Maximum cache time on the CDN, in seconds.
1947          */
1948         public function setCdnMaxage( $maxage ) {
1949                 $this->mCdnMaxage = min( $maxage, $this->mCdnMaxageLimit );
1950         }
1951
1952         /**
1953          * Lower the value of the "s-maxage" part of the "Cache-control" HTTP header
1954          *
1955          * @param int $maxage Maximum cache time on the CDN, in seconds
1956          * @since 1.27
1957          */
1958         public function lowerCdnMaxage( $maxage ) {
1959                 $this->mCdnMaxageLimit = min( $maxage, $this->mCdnMaxageLimit );
1960                 $this->setCdnMaxage( $this->mCdnMaxage );
1961         }
1962
1963         /**
1964          * Use enableClientCache(false) to force it to send nocache headers
1965          *
1966          * @param bool $state
1967          *
1968          * @return bool
1969          */
1970         public function enableClientCache( $state ) {
1971                 return wfSetVar( $this->mEnableClientCache, $state );
1972         }
1973
1974         /**
1975          * Get the list of cookies that will influence on the cache
1976          *
1977          * @return array
1978          */
1979         function getCacheVaryCookies() {
1980                 static $cookies;
1981                 if ( $cookies === null ) {
1982                         $config = $this->getConfig();
1983                         $cookies = array_merge(
1984                                 array(
1985                                         $config->get( 'CookiePrefix' ) . 'Token',
1986                                         $config->get( 'CookiePrefix' ) . 'LoggedOut',
1987                                         "forceHTTPS",
1988                                         session_name()
1989                                 ),
1990                                 $config->get( 'CacheVaryCookies' )
1991                         );
1992                         Hooks::run( 'GetCacheVaryCookies', array( $this, &$cookies ) );
1993                 }
1994                 return $cookies;
1995         }
1996
1997         /**
1998          * Check if the request has a cache-varying cookie header
1999          * If it does, it's very important that we don't allow public caching
2000          *
2001          * @return bool
2002          */
2003         function haveCacheVaryCookies() {
2004                 $request = $this->getRequest();
2005                 foreach ( $this->getCacheVaryCookies() as $cookieName ) {
2006                         if ( $request->getCookie( $cookieName, '', '' ) !== '' ) {
2007                                 wfDebug( __METHOD__ . ": found $cookieName\n" );
2008                                 return true;
2009                         }
2010                 }
2011                 wfDebug( __METHOD__ . ": no cache-varying cookies found\n" );
2012                 return false;
2013         }
2014
2015         /**
2016          * Add an HTTP header that will influence on the cache
2017          *
2018          * @param string $header Header name
2019          * @param string[]|null $option Options for the Key header. See
2020          * https://datatracker.ietf.org/doc/draft-fielding-http-key/
2021          * for the list of valid options.
2022          */
2023         public function addVaryHeader( $header, array $option = null ) {
2024                 if ( !array_key_exists( $header, $this->mVaryHeader ) ) {
2025                         $this->mVaryHeader[$header] = array();
2026                 }
2027                 if ( !is_array( $option ) ) {
2028                         $option = array();
2029                 }
2030                 $this->mVaryHeader[$header] = array_unique( array_merge( $this->mVaryHeader[$header], $option ) );
2031         }
2032
2033         /**
2034          * Return a Vary: header on which to vary caches. Based on the keys of $mVaryHeader,
2035          * such as Accept-Encoding or Cookie
2036          *
2037          * @return string
2038          */
2039         public function getVaryHeader() {
2040                 return 'Vary: ' . join( ', ', array_keys( $this->mVaryHeader ) );
2041         }
2042
2043         /**
2044          * Get a complete Key header
2045          *
2046          * @return string
2047          */
2048         public function getKeyHeader() {
2049                 $cvCookies = $this->getCacheVaryCookies();
2050
2051                 $cookiesOption = array();
2052                 foreach ( $cvCookies as $cookieName ) {
2053                         $cookiesOption[] = 'param=' . $cookieName;
2054                 }
2055                 $this->addVaryHeader( 'Cookie', $cookiesOption );
2056
2057                 $headers = array();
2058                 foreach ( $this->mVaryHeader as $header => $option ) {
2059                         $newheader = $header;
2060                         if ( is_array( $option ) && count( $option ) > 0 ) {
2061                                 $newheader .= ';' . implode( ';', $option );
2062                         }
2063                         $headers[] = $newheader;
2064                 }
2065                 $key = 'Key: ' . implode( ',', $headers );
2066
2067                 return $key;
2068         }
2069
2070         /**
2071          * T23672: Add Accept-Language to Vary and Key headers
2072          * if there's no 'variant' parameter existed in GET.
2073          *
2074          * For example:
2075          *   /w/index.php?title=Main_page should always be served; but
2076          *   /w/index.php?title=Main_page&variant=zh-cn should never be served.
2077          */
2078         function addAcceptLanguage() {
2079                 $title = $this->getTitle();
2080                 if ( !$title instanceof Title ) {
2081                         return;
2082                 }
2083
2084                 $lang = $title->getPageLanguage();
2085                 if ( !$this->getRequest()->getCheck( 'variant' ) && $lang->hasVariants() ) {
2086                         $variants = $lang->getVariants();
2087                         $aloption = array();
2088                         foreach ( $variants as $variant ) {
2089                                 if ( $variant === $lang->getCode() ) {
2090                                         continue;
2091                                 } else {
2092                                         $aloption[] = 'substr=' . $variant;
2093
2094                                         // IE and some other browsers use BCP 47 standards in
2095                                         // their Accept-Language header, like "zh-CN" or "zh-Hant".
2096                                         // We should handle these too.
2097                                         $variantBCP47 = wfBCP47( $variant );
2098                                         if ( $variantBCP47 !== $variant ) {
2099                                                 $aloption[] = 'substr=' . $variantBCP47;
2100                                         }
2101                                 }
2102                         }
2103                         $this->addVaryHeader( 'Accept-Language', $aloption );
2104                 }
2105         }
2106
2107         /**
2108          * Set a flag which will cause an X-Frame-Options header appropriate for
2109          * edit pages to be sent. The header value is controlled by
2110          * $wgEditPageFrameOptions.
2111          *
2112          * This is the default for special pages. If you display a CSRF-protected
2113          * form on an ordinary view page, then you need to call this function.
2114          *
2115          * @param bool $enable
2116          */
2117         public function preventClickjacking( $enable = true ) {
2118                 $this->mPreventClickjacking = $enable;
2119         }
2120
2121         /**
2122          * Turn off frame-breaking. Alias for $this->preventClickjacking(false).
2123          * This can be called from pages which do not contain any CSRF-protected
2124          * HTML form.
2125          */
2126         public function allowClickjacking() {
2127                 $this->mPreventClickjacking = false;
2128         }
2129
2130         /**
2131          * Get the prevent-clickjacking flag
2132          *
2133          * @since 1.24
2134          * @return bool
2135          */
2136         public function getPreventClickjacking() {
2137                 return $this->mPreventClickjacking;
2138         }
2139
2140         /**
2141          * Get the X-Frame-Options header value (without the name part), or false
2142          * if there isn't one. This is used by Skin to determine whether to enable
2143          * JavaScript frame-breaking, for clients that don't support X-Frame-Options.
2144          *
2145          * @return string
2146          */
2147         public function getFrameOptions() {
2148                 $config = $this->getConfig();
2149                 if ( $config->get( 'BreakFrames' ) ) {
2150                         return 'DENY';
2151                 } elseif ( $this->mPreventClickjacking && $config->get( 'EditPageFrameOptions' ) ) {
2152                         return $config->get( 'EditPageFrameOptions' );
2153                 }
2154                 return false;
2155         }
2156
2157         /**
2158          * Send cache control HTTP headers
2159          */
2160         public function sendCacheControl() {
2161                 $response = $this->getRequest()->response();
2162                 $config = $this->getConfig();
2163                 if ( $config->get( 'UseETag' ) && $this->mETag ) {
2164                         $response->header( "ETag: $this->mETag" );
2165                 }
2166
2167                 $this->addVaryHeader( 'Cookie' );
2168                 $this->addAcceptLanguage();
2169
2170                 # don't serve compressed data to clients who can't handle it
2171                 # maintain different caches for logged-in users and non-logged in ones
2172                 $response->header( $this->getVaryHeader() );
2173
2174                 if ( $config->get( 'UseKeyHeader' ) ) {
2175                         $response->header( $this->getKeyHeader() );
2176                 }
2177
2178                 if ( $this->mEnableClientCache ) {
2179                         if (
2180                                 $config->get( 'UseSquid' ) && session_id() == '' && !$this->isPrintable() &&
2181                                 $this->mCdnMaxage != 0 && !$this->haveCacheVaryCookies()
2182                         ) {
2183                                 if ( $config->get( 'UseESI' ) ) {
2184                                         # We'll purge the proxy cache explicitly, but require end user agents
2185                                         # to revalidate against the proxy on each visit.
2186                                         # Surrogate-Control controls our CDN, Cache-Control downstream caches
2187                                         wfDebug( __METHOD__ . ": proxy caching with ESI; {$this->mLastModified} **\n", 'log' );
2188                                         # start with a shorter timeout for initial testing
2189                                         # header( 'Surrogate-Control: max-age=2678400+2678400, content="ESI/1.0"');
2190                                         $response->header( 'Surrogate-Control: max-age=' . $config->get( 'SquidMaxage' )
2191                                                 . '+' . $this->mCdnMaxage . ', content="ESI/1.0"' );
2192                                         $response->header( 'Cache-Control: s-maxage=0, must-revalidate, max-age=0' );
2193                                 } else {
2194                                         # We'll purge the proxy cache for anons explicitly, but require end user agents
2195                                         # to revalidate against the proxy on each visit.
2196                                         # IMPORTANT! The CDN needs to replace the Cache-Control header with
2197                                         # Cache-Control: s-maxage=0, must-revalidate, max-age=0
2198                                         wfDebug( __METHOD__ . ": local proxy caching; {$this->mLastModified} **\n", 'log' );
2199                                         # start with a shorter timeout for initial testing
2200                                         # header( "Cache-Control: s-maxage=2678400, must-revalidate, max-age=0" );
2201                                         $response->header( 'Cache-Control: s-maxage=' . $this->mCdnMaxage
2202                                                 . ', must-revalidate, max-age=0' );
2203                                 }
2204                         } else {
2205                                 # We do want clients to cache if they can, but they *must* check for updates
2206                                 # on revisiting the page.
2207                                 wfDebug( __METHOD__ . ": private caching; {$this->mLastModified} **\n", 'log' );
2208                                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
2209                                 $response->header( "Cache-Control: private, must-revalidate, max-age=0" );
2210                         }
2211                         if ( $this->mLastModified ) {
2212                                 $response->header( "Last-Modified: {$this->mLastModified}" );
2213                         }
2214                 } else {
2215                         wfDebug( __METHOD__ . ": no caching **\n", 'log' );
2216
2217                         # In general, the absence of a last modified header should be enough to prevent
2218                         # the client from using its cache. We send a few other things just to make sure.
2219                         $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
2220                         $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
2221                         $response->header( 'Pragma: no-cache' );
2222                 }
2223         }
2224
2225         /**
2226          * Finally, all the text has been munged and accumulated into
2227          * the object, let's actually output it:
2228          */
2229         public function output() {
2230                 if ( $this->mDoNothing ) {
2231                         return;
2232                 }
2233
2234                 $response = $this->getRequest()->response();
2235                 $config = $this->getConfig();
2236
2237                 if ( $this->mRedirect != '' ) {
2238                         # Standards require redirect URLs to be absolute
2239                         $this->mRedirect = wfExpandUrl( $this->mRedirect, PROTO_CURRENT );
2240
2241                         $redirect = $this->mRedirect;
2242                         $code = $this->mRedirectCode;
2243
2244                         if ( Hooks::run( "BeforePageRedirect", array( $this, &$redirect, &$code ) ) ) {
2245                                 if ( $code == '301' || $code == '303' ) {
2246                                         if ( !$config->get( 'DebugRedirects' ) ) {
2247                                                 $response->statusHeader( $code );
2248                                         }
2249                                         $this->mLastModified = wfTimestamp( TS_RFC2822 );
2250                                 }
2251                                 if ( $config->get( 'VaryOnXFP' ) ) {
2252                                         $this->addVaryHeader( 'X-Forwarded-Proto' );
2253                                 }
2254                                 $this->sendCacheControl();
2255
2256                                 $response->header( "Content-Type: text/html; charset=utf-8" );
2257                                 if ( $config->get( 'DebugRedirects' ) ) {
2258                                         $url = htmlspecialchars( $redirect );
2259                                         print "<html>\n<head>\n<title>Redirect</title>\n</head>\n<body>\n";
2260                                         print "<p>Location: <a href=\"$url\">$url</a></p>\n";
2261                                         print "</body>\n</html>\n";
2262                                 } else {
2263                                         $response->header( 'Location: ' . $redirect );
2264                                 }
2265                         }
2266
2267                         return;
2268                 } elseif ( $this->mStatusCode ) {
2269                         $response->statusHeader( $this->mStatusCode );
2270                 }
2271
2272                 # Buffer output; final headers may depend on later processing
2273                 ob_start();
2274
2275                 $response->header( 'Content-type: ' . $config->get( 'MimeType' ) . '; charset=UTF-8' );
2276                 $response->header( 'Content-language: ' . $config->get( 'LanguageCode' ) );
2277
2278                 // Avoid Internet Explorer "compatibility view" in IE 8-10, so that
2279                 // jQuery etc. can work correctly.
2280                 $response->header( 'X-UA-Compatible: IE=Edge' );
2281
2282                 // Prevent framing, if requested
2283                 $frameOptions = $this->getFrameOptions();
2284                 if ( $frameOptions ) {
2285                         $response->header( "X-Frame-Options: $frameOptions" );
2286                 }
2287
2288                 if ( $this->mArticleBodyOnly ) {
2289                         echo $this->mBodytext;
2290                 } else {
2291                         $sk = $this->getSkin();
2292                         // add skin specific modules
2293                         $modules = $sk->getDefaultModules();
2294
2295                         // Enforce various default modules for all skins
2296                         $coreModules = array(
2297                                 // Keep this list as small as possible
2298                                 'site',
2299                                 'mediawiki.page.startup',
2300                                 'mediawiki.user',
2301                         );
2302
2303                         // Support for high-density display images if enabled
2304                         if ( $config->get( 'ResponsiveImages' ) ) {
2305                                 $coreModules[] = 'mediawiki.hidpi';
2306                         }
2307
2308                         $this->addModules( $coreModules );
2309                         foreach ( $modules as $group ) {
2310                                 $this->addModules( $group );
2311                         }
2312                         MWDebug::addModules( $this );
2313
2314                         // Hook that allows last minute changes to the output page, e.g.
2315                         // adding of CSS or Javascript by extensions.
2316                         Hooks::run( 'BeforePageDisplay', array( &$this, &$sk ) );
2317
2318                         $sk->outputPage();
2319                 }
2320
2321                 // This hook allows last minute changes to final overall output by modifying output buffer
2322                 Hooks::run( 'AfterFinalPageOutput', array( $this ) );
2323
2324                 $this->sendCacheControl();
2325
2326                 ob_end_flush();
2327
2328         }
2329
2330         /**
2331          * Actually output something with print.
2332          *
2333          * @param string $ins The string to output
2334          * @deprecated since 1.22 Use echo yourself.
2335          */
2336         public function out( $ins ) {
2337                 wfDeprecated( __METHOD__, '1.22' );
2338                 print $ins;
2339         }
2340
2341         /**
2342          * Produce a "user is blocked" page.
2343          * @deprecated since 1.18
2344          */
2345         function blockedPage() {
2346                 wfDeprecated( __METHOD__, '1.18' );
2347                 throw new UserBlockedError( $this->getUser()->mBlock );
2348         }
2349
2350         /**
2351          * Prepare this object to display an error page; disable caching and
2352          * indexing, clear the current text and redirect, set the page's title
2353          * and optionally an custom HTML title (content of the "<title>" tag).
2354          *
2355          * @param string|Message $pageTitle Will be passed directly to setPageTitle()
2356          * @param string|Message $htmlTitle Will be passed directly to setHTMLTitle();
2357          *                   optional, if not passed the "<title>" attribute will be
2358          *                   based on $pageTitle
2359          */
2360         public function prepareErrorPage( $pageTitle, $htmlTitle = false ) {
2361                 $this->setPageTitle( $pageTitle );
2362                 if ( $htmlTitle !== false ) {
2363                         $this->setHTMLTitle( $htmlTitle );
2364                 }
2365                 $this->setRobotPolicy( 'noindex,nofollow' );
2366                 $this->setArticleRelated( false );
2367                 $this->enableClientCache( false );
2368                 $this->mRedirect = '';
2369                 $this->clearSubtitle();
2370                 $this->clearHTML();
2371         }
2372
2373         /**
2374          * Output a standard error page
2375          *
2376          * showErrorPage( 'titlemsg', 'pagetextmsg' );
2377          * showErrorPage( 'titlemsg', 'pagetextmsg', array( 'param1', 'param2' ) );
2378          * showErrorPage( 'titlemsg', $messageObject );
2379          * showErrorPage( $titleMessageObject, $messageObject );
2380          *
2381          * @param string|Message $title Message key (string) for page title, or a Message object
2382          * @param string|Message $msg Message key (string) for page text, or a Message object
2383          * @param array $params Message parameters; ignored if $msg is a Message object
2384          */
2385         public function showErrorPage( $title, $msg, $params = array() ) {
2386                 if ( !$title instanceof Message ) {
2387                         $title = $this->msg( $title );
2388                 }
2389
2390                 $this->prepareErrorPage( $title );
2391
2392                 if ( $msg instanceof Message ) {
2393                         if ( $params !== array() ) {
2394                                 trigger_error( 'Argument ignored: $params. The message parameters argument '
2395                                         . 'is discarded when the $msg argument is a Message object instead of '
2396                                         . 'a string.', E_USER_NOTICE );
2397                         }
2398                         $this->addHTML( $msg->parseAsBlock() );
2399                 } else {
2400                         $this->addWikiMsgArray( $msg, $params );
2401                 }
2402
2403                 $this->returnToMain();
2404         }
2405
2406         /**
2407          * Output a standard permission error page
2408          *
2409          * @param array $errors Error message keys
2410          * @param string $action Action that was denied or null if unknown
2411          */
2412         public function showPermissionsErrorPage( array $errors, $action = null ) {
2413                 // For some action (read, edit, create and upload), display a "login to do this action"
2414                 // error if all of the following conditions are met:
2415                 // 1. the user is not logged in
2416                 // 2. the only error is insufficient permissions (i.e. no block or something else)
2417                 // 3. the error can be avoided simply by logging in
2418                 if ( in_array( $action, array( 'read', 'edit', 'createpage', 'createtalk', 'upload' ) )
2419                         && $this->getUser()->isAnon() && count( $errors ) == 1 && isset( $errors[0][0] )
2420                         && ( $errors[0][0] == 'badaccess-groups' || $errors[0][0] == 'badaccess-group0' )
2421                         && ( User::groupHasPermission( 'user', $action )
2422                         || User::groupHasPermission( 'autoconfirmed', $action ) )
2423                 ) {
2424                         $displayReturnto = null;
2425
2426                         # Due to bug 32276, if a user does not have read permissions,
2427                         # $this->getTitle() will just give Special:Badtitle, which is
2428                         # not especially useful as a returnto parameter. Use the title
2429                         # from the request instead, if there was one.
2430                         $request = $this->getRequest();
2431                         $returnto = Title::newFromText( $request->getVal( 'title', '' ) );
2432                         if ( $action == 'edit' ) {
2433                                 $msg = 'whitelistedittext';
2434                                 $displayReturnto = $returnto;
2435                         } elseif ( $action == 'createpage' || $action == 'createtalk' ) {
2436                                 $msg = 'nocreatetext';
2437                         } elseif ( $action == 'upload' ) {
2438                                 $msg = 'uploadnologintext';
2439                         } else { # Read
2440                                 $msg = 'loginreqpagetext';
2441                                 $displayReturnto = Title::newMainPage();
2442                         }
2443
2444                         $query = array();
2445
2446                         if ( $returnto ) {
2447                                 $query['returnto'] = $returnto->getPrefixedText();
2448
2449                                 if ( !$request->wasPosted() ) {
2450                                         $returntoquery = $request->getValues();
2451                                         unset( $returntoquery['title'] );
2452                                         unset( $returntoquery['returnto'] );
2453                                         unset( $returntoquery['returntoquery'] );
2454                                         $query['returntoquery'] = wfArrayToCgi( $returntoquery );
2455                                 }
2456                         }
2457                         $loginLink = Linker::linkKnown(
2458                                 SpecialPage::getTitleFor( 'Userlogin' ),
2459                                 $this->msg( 'loginreqlink' )->escaped(),
2460                                 array(),
2461                                 $query
2462                         );
2463
2464                         $this->prepareErrorPage( $this->msg( 'loginreqtitle' ) );
2465                         $this->addHTML( $this->msg( $msg )->rawParams( $loginLink )->parse() );
2466
2467                         # Don't return to a page the user can't read otherwise
2468                         # we'll end up in a pointless loop
2469                         if ( $displayReturnto && $displayReturnto->userCan( 'read', $this->getUser() ) ) {
2470                                 $this->returnToMain( null, $displayReturnto );
2471                         }
2472                 } else {
2473                         $this->prepareErrorPage( $this->msg( 'permissionserrors' ) );
2474                         $this->addWikiText( $this->formatPermissionsErrorMessage( $errors, $action ) );
2475                 }
2476         }
2477
2478         /**
2479          * Display an error page indicating that a given version of MediaWiki is
2480          * required to use it
2481          *
2482          * @param mixed $version The version of MediaWiki needed to use the page
2483          */
2484         public function versionRequired( $version ) {
2485                 $this->prepareErrorPage( $this->msg( 'versionrequired', $version ) );
2486
2487                 $this->addWikiMsg( 'versionrequiredtext', $version );
2488                 $this->returnToMain();
2489         }
2490
2491         /**
2492          * Display an error page noting that a given permission bit is required.
2493          * @deprecated since 1.18, just throw the exception directly
2494          * @param string $permission Key required
2495          * @throws PermissionsError
2496          */
2497         public function permissionRequired( $permission ) {
2498                 wfDeprecated( __METHOD__, '1.18' );
2499                 throw new PermissionsError( $permission );
2500         }
2501
2502         /**
2503          * Produce the stock "please login to use the wiki" page
2504          *
2505          * @deprecated since 1.19; throw the exception directly
2506          */
2507         public function loginToUse() {
2508                 wfDeprecated( __METHOD__, '1.19' );
2509                 throw new PermissionsError( 'read' );
2510         }
2511
2512         /**
2513          * Format a list of error messages
2514          *
2515          * @param array $errors Array of arrays returned by Title::getUserPermissionsErrors
2516          * @param string $action Action that was denied or null if unknown
2517          * @return string The wikitext error-messages, formatted into a list.
2518          */
2519         public function formatPermissionsErrorMessage( array $errors, $action = null ) {
2520                 if ( $action == null ) {
2521                         $text = $this->msg( 'permissionserrorstext', count( $errors ) )->plain() . "\n\n";
2522                 } else {
2523                         $action_desc = $this->msg( "action-$action" )->plain();
2524                         $text = $this->msg(
2525                                 'permissionserrorstext-withaction',
2526                                 count( $errors ),
2527                                 $action_desc
2528                         )->plain() . "\n\n";
2529                 }
2530
2531                 if ( count( $errors ) > 1 ) {
2532                         $text .= '<ul class="permissions-errors">' . "\n";
2533
2534                         foreach ( $errors as $error ) {
2535                                 $text .= '<li>';
2536                                 $text .= call_user_func_array( array( $this, 'msg' ), $error )->plain();
2537                                 $text .= "</li>\n";
2538                         }
2539                         $text .= '</ul>';
2540                 } else {
2541                         $text .= "<div class=\"permissions-errors\">\n" .
2542                                         call_user_func_array( array( $this, 'msg' ), reset( $errors ) )->plain() .
2543                                         "\n</div>";
2544                 }
2545
2546                 return $text;
2547         }
2548
2549         /**
2550          * Display a page stating that the Wiki is in read-only mode.
2551          * Should only be called after wfReadOnly() has returned true.
2552          *
2553          * Historically, this function was used to show the source of the page that the user
2554          * was trying to edit and _also_ permissions error messages. The relevant code was
2555          * moved into EditPage in 1.19 (r102024 / d83c2a431c2a) and removed here in 1.25.
2556          *
2557          * @deprecated since 1.25; throw the exception directly
2558          * @throws ReadOnlyError
2559          */
2560         public function readOnlyPage() {
2561                 if ( func_num_args() > 0 ) {
2562                         throw new MWException( __METHOD__ . ' no longer accepts arguments since 1.25.' );
2563                 }
2564
2565                 throw new ReadOnlyError;
2566         }
2567
2568         /**
2569          * Turn off regular page output and return an error response
2570          * for when rate limiting has triggered.
2571          *
2572          * @deprecated since 1.25; throw the exception directly
2573          */
2574         public function rateLimited() {
2575                 wfDeprecated( __METHOD__, '1.25' );
2576                 throw new ThrottledError;
2577         }
2578
2579         /**
2580          * Show a warning about slave lag
2581          *
2582          * If the lag is higher than $wgSlaveLagCritical seconds,
2583          * then the warning is a bit more obvious. If the lag is
2584          * lower than $wgSlaveLagWarning, then no warning is shown.
2585          *
2586          * @param int $lag Slave lag
2587          */
2588         public function showLagWarning( $lag ) {
2589                 $config = $this->getConfig();
2590                 if ( $lag >= $config->get( 'SlaveLagWarning' ) ) {
2591                         $message = $lag < $config->get( 'SlaveLagCritical' )
2592                                 ? 'lag-warn-normal'
2593                                 : 'lag-warn-high';
2594                         $wrap = Html::rawElement( 'div', array( 'class' => "mw-{$message}" ), "\n$1\n" );
2595                         $this->wrapWikiMsg( "$wrap\n", array( $message, $this->getLanguage()->formatNum( $lag ) ) );
2596                 }
2597         }
2598
2599         public function showFatalError( $message ) {
2600                 $this->prepareErrorPage( $this->msg( 'internalerror' ) );
2601
2602                 $this->addHTML( $message );
2603         }
2604
2605         public function showUnexpectedValueError( $name, $val ) {
2606                 $this->showFatalError( $this->msg( 'unexpected', $name, $val )->text() );
2607         }
2608
2609         public function showFileCopyError( $old, $new ) {
2610                 $this->showFatalError( $this->msg( 'filecopyerror', $old, $new )->text() );
2611         }
2612
2613         public function showFileRenameError( $old, $new ) {
2614                 $this->showFatalError( $this->msg( 'filerenameerror', $old, $new )->text() );
2615         }
2616
2617         public function showFileDeleteError( $name ) {
2618                 $this->showFatalError( $this->msg( 'filedeleteerror', $name )->text() );
2619         }
2620
2621         public function showFileNotFoundError( $name ) {
2622                 $this->showFatalError( $this->msg( 'filenotfound', $name )->text() );
2623         }
2624
2625         /**
2626          * Add a "return to" link pointing to a specified title
2627          *
2628          * @param Title $title Title to link
2629          * @param array $query Query string parameters
2630          * @param string $text Text of the link (input is not escaped)
2631          * @param array $options Options array to pass to Linker
2632          */
2633         public function addReturnTo( $title, array $query = array(), $text = null, $options = array() ) {
2634                 $link = $this->msg( 'returnto' )->rawParams(
2635                         Linker::link( $title, $text, array(), $query, $options ) )->escaped();
2636                 $this->addHTML( "<p id=\"mw-returnto\">{$link}</p>\n" );
2637         }
2638
2639         /**
2640          * Add a "return to" link pointing to a specified title,
2641          * or the title indicated in the request, or else the main page
2642          *
2643          * @param mixed $unused
2644          * @param Title|string $returnto Title or String to return to
2645          * @param string $returntoquery Query string for the return to link
2646          */
2647         public function returnToMain( $unused = null, $returnto = null, $returntoquery = null ) {
2648                 if ( $returnto == null ) {
2649                         $returnto = $this->getRequest()->getText( 'returnto' );
2650                 }
2651
2652                 if ( $returntoquery == null ) {
2653                         $returntoquery = $this->getRequest()->getText( 'returntoquery' );
2654                 }
2655
2656                 if ( $returnto === '' ) {
2657                         $returnto = Title::newMainPage();
2658                 }
2659
2660                 if ( is_object( $returnto ) ) {
2661                         $titleObj = $returnto;
2662                 } else {
2663                         $titleObj = Title::newFromText( $returnto );
2664                 }
2665                 if ( !is_object( $titleObj ) ) {
2666                         $titleObj = Title::newMainPage();
2667                 }
2668
2669                 $this->addReturnTo( $titleObj, wfCgiToArray( $returntoquery ) );
2670         }
2671
2672         /**
2673          * @param Skin $sk The given Skin
2674          * @param bool $includeStyle Unused
2675          * @return string The doctype, opening "<html>", and head element.
2676          */
2677         public function headElement( Skin $sk, $includeStyle = true ) {
2678                 global $wgContLang;
2679
2680                 $userdir = $this->getLanguage()->getDir();
2681                 $sitedir = $wgContLang->getDir();
2682
2683                 $ret = Html::htmlHeader( $sk->getHtmlElementAttributes() );
2684
2685                 if ( $this->getHTMLTitle() == '' ) {
2686                         $this->setHTMLTitle( $this->msg( 'pagetitle', $this->getPageTitle() )->inContentLanguage() );
2687                 }
2688
2689                 $openHead = Html::openElement( 'head' );
2690                 if ( $openHead ) {
2691                         # Don't bother with the newline if $head == ''
2692                         $ret .= "$openHead\n";
2693                 }
2694
2695                 if ( !Html::isXmlMimeType( $this->getConfig()->get( 'MimeType' ) ) ) {
2696                         // Add <meta charset="UTF-8">
2697                         // This should be before <title> since it defines the charset used by
2698                         // text including the text inside <title>.
2699                         // The spec recommends defining XHTML5's charset using the XML declaration
2700                         // instead of meta.
2701                         // Our XML declaration is output by Html::htmlHeader.
2702                         // http://www.whatwg.org/html/semantics.html#attr-meta-http-equiv-content-type
2703                         // http://www.whatwg.org/html/semantics.html#charset
2704                         $ret .= Html::element( 'meta', array( 'charset' => 'UTF-8' ) ) . "\n";
2705                 }
2706
2707                 $ret .= Html::element( 'title', null, $this->getHTMLTitle() ) . "\n";
2708                 $ret .= $this->getInlineHeadScripts() . "\n";
2709                 $ret .= $this->buildCssLinks() . "\n";
2710                 $ret .= $this->getExternalHeadScripts() . "\n";
2711
2712                 foreach ( $this->getHeadLinksArray() as $item ) {
2713                         $ret .= $item . "\n";
2714                 }
2715
2716                 foreach ( $this->mHeadItems as $item ) {
2717                         $ret .= $item . "\n";
2718                 }
2719
2720                 $closeHead = Html::closeElement( 'head' );
2721                 if ( $closeHead ) {
2722                         $ret .= "$closeHead\n";
2723                 }
2724
2725                 $bodyClasses = array();
2726                 $bodyClasses[] = 'mediawiki';
2727
2728                 # Classes for LTR/RTL directionality support
2729                 $bodyClasses[] = $userdir;
2730                 $bodyClasses[] = "sitedir-$sitedir";
2731
2732                 if ( $this->getLanguage()->capitalizeAllNouns() ) {
2733                         # A <body> class is probably not the best way to do this . . .
2734                         $bodyClasses[] = 'capitalize-all-nouns';
2735                 }
2736
2737                 $bodyClasses[] = $sk->getPageClasses( $this->getTitle() );
2738                 $bodyClasses[] = 'skin-' . Sanitizer::escapeClass( $sk->getSkinName() );
2739                 $bodyClasses[] =
2740                         'action-' . Sanitizer::escapeClass( Action::getActionName( $this->getContext() ) );
2741
2742                 $bodyAttrs = array();
2743                 // While the implode() is not strictly needed, it's used for backwards compatibility
2744                 // (this used to be built as a string and hooks likely still expect that).
2745                 $bodyAttrs['class'] = implode( ' ', $bodyClasses );
2746
2747                 // Allow skins and extensions to add body attributes they need
2748                 $sk->addToBodyAttributes( $this, $bodyAttrs );
2749                 Hooks::run( 'OutputPageBodyAttributes', array( $this, $sk, &$bodyAttrs ) );
2750
2751                 $ret .= Html::openElement( 'body', $bodyAttrs ) . "\n";
2752
2753                 return $ret;
2754         }
2755
2756         /**
2757          * Get a ResourceLoader object associated with this OutputPage
2758          *
2759          * @return ResourceLoader
2760          */
2761         public function getResourceLoader() {
2762                 if ( is_null( $this->mResourceLoader ) ) {
2763                         $this->mResourceLoader = new ResourceLoader(
2764                                 $this->getConfig(),
2765                                 LoggerFactory::getInstance( 'resourceloader' )
2766                         );
2767                 }
2768                 return $this->mResourceLoader;
2769         }
2770
2771         /**
2772          * Construct neccecary html and loader preset states to load modules on a page.
2773          *
2774          * Use getHtmlFromLoaderLinks() to convert this array to HTML.
2775          *
2776          * @param array|string $modules One or more module names
2777          * @param string $only ResourceLoaderModule TYPE_ class constant
2778          * @param array $extraQuery [optional] Array with extra query parameters for the request
2779          * @return array A list of HTML strings and array of client loader preset states
2780          */
2781         public function makeResourceLoaderLink( $modules, $only, array $extraQuery = array() ) {
2782                 $modules = (array)$modules;
2783
2784                 $links = array(
2785                         // List of html strings
2786                         'html' => array(),
2787                         // Associative array of module names and their states
2788                         'states' => array(),
2789                 );
2790
2791                 if ( !count( $modules ) ) {
2792                         return $links;
2793                 }
2794
2795                 if ( count( $modules ) > 1 ) {
2796                         // Remove duplicate module requests
2797                         $modules = array_unique( $modules );
2798                         // Sort module names so requests are more uniform
2799                         sort( $modules );
2800
2801                         if ( ResourceLoader::inDebugMode() ) {
2802                                 // Recursively call us for every item
2803                                 foreach ( $modules as $name ) {
2804                                         $link = $this->makeResourceLoaderLink( $name, $only, $extraQuery );
2805                                         $links['html'] = array_merge( $links['html'], $link['html'] );
2806                                         $links['states'] += $link['states'];
2807                                 }
2808                                 return $links;
2809                         }
2810                 }
2811
2812                 if ( !is_null( $this->mTarget ) ) {
2813                         $extraQuery['target'] = $this->mTarget;
2814                 }
2815
2816                 // Create keyed-by-source and then keyed-by-group list of module objects from modules list
2817                 $sortedModules = array();
2818                 $resourceLoader = $this->getResourceLoader();
2819                 foreach ( $modules as $name ) {
2820                         $module = $resourceLoader->getModule( $name );
2821                         # Check that we're allowed to include this module on this page
2822                         if ( !$module
2823                                 || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_SCRIPTS )
2824                                         && $only == ResourceLoaderModule::TYPE_SCRIPTS )
2825                                 || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_STYLES )
2826                                         && $only == ResourceLoaderModule::TYPE_STYLES )
2827                                 || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_COMBINED )
2828                                         && $only == ResourceLoaderModule::TYPE_COMBINED )
2829                                 || ( $this->mTarget && !in_array( $this->mTarget, $module->getTargets() ) )
2830                         ) {
2831                                 continue;
2832                         }
2833
2834                         $sortedModules[$module->getSource()][$module->getGroup()][$name] = $module;
2835                 }
2836
2837                 foreach ( $sortedModules as $source => $groups ) {
2838                         foreach ( $groups as $group => $grpModules ) {
2839                                 // Special handling for user-specific groups
2840                                 $user = null;
2841                                 if ( ( $group === 'user' || $group === 'private' ) && $this->getUser()->isLoggedIn() ) {
2842                                         $user = $this->getUser()->getName();
2843                                 }
2844
2845                                 // Create a fake request based on the one we are about to make so modules return
2846                                 // correct timestamp and emptiness data
2847                                 $query = ResourceLoader::makeLoaderQuery(
2848                                         array(), // modules; not determined yet
2849                                         $this->getLanguage()->getCode(),
2850                                         $this->getSkin()->getSkinName(),
2851                                         $user,
2852                                         null, // version; not determined yet
2853                                         ResourceLoader::inDebugMode(),
2854                                         $only === ResourceLoaderModule::TYPE_COMBINED ? null : $only,
2855                                         $this->isPrintable(),
2856                                         $this->getRequest()->getBool( 'handheld' ),
2857                                         $extraQuery
2858                                 );
2859                                 $context = new ResourceLoaderContext( $resourceLoader, new FauxRequest( $query ) );
2860
2861                                 // Extract modules that know they're empty and see if we have one or more
2862                                 // raw modules
2863                                 $isRaw = false;
2864                                 foreach ( $grpModules as $key => $module ) {
2865                                         // Inline empty modules: since they're empty, just mark them as 'ready' (bug 46857)
2866                                         // If we're only getting the styles, we don't need to do anything for empty modules.
2867                                         if ( $module->isKnownEmpty( $context ) ) {
2868                                                 unset( $grpModules[$key] );
2869                                                 if ( $only !== ResourceLoaderModule::TYPE_STYLES ) {
2870                                                         $links['states'][$key] = 'ready';
2871                                                 }
2872                                         }
2873
2874                                         $isRaw |= $module->isRaw();
2875                                 }
2876
2877                                 // If there are no non-empty modules, skip this group
2878                                 if ( count( $grpModules ) === 0 ) {
2879                                         continue;
2880                                 }
2881
2882                                 // Inline private modules. These can't be loaded through load.php for security
2883                                 // reasons, see bug 34907. Note that these modules should be loaded from
2884                                 // getExternalHeadScripts() before the first loader call. Otherwise other modules can't
2885                                 // properly use them as dependencies (bug 30914)
2886                                 if ( $group === 'private' ) {
2887                                         if ( $only == ResourceLoaderModule::TYPE_STYLES ) {
2888                                                 $links['html'][] = Html::inlineStyle(
2889                                                         $resourceLoader->makeModuleResponse( $context, $grpModules )
2890                                                 );
2891                                         } else {
2892                                                 $links['html'][] = ResourceLoader::makeInlineScript(
2893                                                         $resourceLoader->makeModuleResponse( $context, $grpModules )
2894                                                 );
2895                                         }
2896                                         continue;
2897                                 }
2898
2899                                 // Special handling for the user group; because users might change their stuff
2900                                 // on-wiki like user pages, or user preferences; we need to find the highest
2901                                 // timestamp of these user-changeable modules so we can ensure cache misses on change
2902                                 // This should NOT be done for the site group (bug 27564) because anons get that too
2903                                 // and we shouldn't be putting timestamps in CDN-cached HTML
2904                                 $version = null;
2905                                 if ( $group === 'user' ) {
2906                                         $query['version'] = $resourceLoader->getCombinedVersion( $context, array_keys( $grpModules ) );
2907                                 }
2908
2909                                 $query['modules'] = ResourceLoader::makePackedModulesString( array_keys( $grpModules ) );
2910                                 $moduleContext = new ResourceLoaderContext( $resourceLoader, new FauxRequest( $query ) );
2911                                 $url = $resourceLoader->createLoaderURL( $source, $moduleContext, $extraQuery );
2912
2913                                 // Automatically select style/script elements
2914                                 if ( $only === ResourceLoaderModule::TYPE_STYLES ) {
2915                                         $link = Html::linkedStyle( $url );
2916                                 } else {
2917                                         if ( $context->getRaw() || $isRaw ) {
2918                                                 // Startup module can't load itself, needs to use <script> instead of mw.loader.load
2919                                                 $link = Html::element( 'script', array(
2920                                                         // In SpecialJavaScriptTest, QUnit must load synchronous
2921                                                         'async' => !isset( $extraQuery['sync'] ),
2922                                                         'src' => $url
2923                                                 ) );
2924                                         } else {
2925                                                 $link = ResourceLoader::makeInlineScript(
2926                                                         Xml::encodeJsCall( 'mw.loader.load', array( $url ) )
2927                                                 );
2928                                         }
2929
2930                                         // For modules requested directly in the html via <script> or mw.loader.load
2931                                         // tell mw.loader they are being loading to prevent duplicate requests.
2932                                         foreach ( $grpModules as $key => $module ) {
2933                                                 // Don't output state=loading for the startup module.
2934                                                 if ( $key !== 'startup' ) {
2935                                                         $links['states'][$key] = 'loading';
2936                                                 }
2937                                         }
2938                                 }
2939
2940                                 if ( $group == 'noscript' ) {
2941                                         $links['html'][] = Html::rawElement( 'noscript', array(), $link );
2942                                 } else {
2943                                         $links['html'][] = $link;
2944                                 }
2945                         }
2946                 }
2947
2948                 return $links;
2949         }
2950
2951         /**
2952          * Build html output from an array of links from makeResourceLoaderLink.
2953          * @param array $links
2954          * @return string HTML
2955          */
2956         protected static function getHtmlFromLoaderLinks( array $links ) {
2957                 $html = array();
2958                 $states = array();
2959                 foreach ( $links as $link ) {
2960                         if ( !is_array( $link ) ) {
2961                                 $html[] = $link;
2962                         } else {
2963                                 $html = array_merge( $html, $link['html'] );
2964                                 $states += $link['states'];
2965                         }
2966                 }
2967                 // Filter out empty values
2968                 $html = array_filter( $html, 'strlen' );
2969
2970                 if ( count( $states ) ) {
2971                         array_unshift( $html, ResourceLoader::makeInlineScript(
2972                                 ResourceLoader::makeLoaderStateScript( $states )
2973                         ) );
2974                 }
2975
2976                 return WrappedString::join( "\n", $html );
2977         }
2978
2979         /**
2980          * JS stuff to put in the "<head>". This is the startup module, config
2981          * vars and modules marked with position 'top'
2982          *
2983          * @return string HTML fragment
2984          */
2985         function getHeadScripts() {
2986                 return $this->getInlineHeadScripts() . "\n" . $this->getExternalHeadScripts();
2987         }
2988
2989         /**
2990          * <script src="..."> tags for "<head>". This is the startup module
2991          * and other modules marked with position 'top'.
2992          *
2993          * @return string HTML fragment
2994          */
2995         function getExternalHeadScripts() {
2996                 $links = array();
2997
2998                 // Startup - this provides the client with the module
2999                 // manifest and loads jquery and mediawiki base modules
3000                 $links[] = $this->makeResourceLoaderLink( 'startup', ResourceLoaderModule::TYPE_SCRIPTS );
3001
3002                 return self::getHtmlFromLoaderLinks( $links );
3003         }
3004
3005         /**
3006          * <script>...</script> tags to put in "<head>".
3007          *
3008          * @return string HTML fragment
3009          */
3010         function getInlineHeadScripts() {
3011                 $links = array();
3012
3013                 // Client profile classes for <html>. Allows for easy hiding/showing of UI components.
3014                 // Must be done synchronously on every page to avoid flashes of wrong content.
3015                 // Note: This class distinguishes MediaWiki-supported JavaScript from the rest.
3016                 // The "rest" includes browsers that support JavaScript but not supported by our runtime.
3017                 // For the performance benefit of the majority, this is added unconditionally here and is
3018                 // then fixed up by the startup module for unsupported browsers.
3019                 $links[] = Html::inlineScript(
3020                         'document.documentElement.className = document.documentElement.className'
3021                         . '.replace( /(^|\s)client-nojs(\s|$)/, "$1client-js$2" );'
3022                 );
3023
3024                 // Load config before anything else
3025                 $links[] = ResourceLoader::makeInlineScript(
3026                         ResourceLoader::makeConfigSetScript( $this->getJSVars() )
3027                 );
3028
3029                 // Load embeddable private modules before any loader links
3030                 // This needs to be TYPE_COMBINED so these modules are properly wrapped
3031                 // in mw.loader.implement() calls and deferred until mw.user is available
3032                 $embedScripts = array( 'user.options' );
3033                 $links[] = $this->makeResourceLoaderLink(
3034                         $embedScripts,
3035                         ResourceLoaderModule::TYPE_COMBINED
3036                 );
3037                 // Separate user.tokens as otherwise caching will be allowed (T84960)
3038                 $links[] = $this->makeResourceLoaderLink(
3039                         'user.tokens',
3040                         ResourceLoaderModule::TYPE_COMBINED
3041                 );
3042
3043                 // Modules requests - let the client calculate dependencies and batch requests as it likes
3044                 // Only load modules that have marked themselves for loading at the top
3045                 $modules = $this->getModules( true, 'top' );
3046                 if ( $modules ) {
3047                         $links[] = ResourceLoader::makeInlineScript(
3048                                 Xml::encodeJsCall( 'mw.loader.load', array( $modules ) )
3049                         );
3050                 }
3051
3052                 // "Scripts only" modules marked for top inclusion
3053                 $links[] = $this->makeResourceLoaderLink(
3054                         $this->getModuleScripts( true, 'top' ),
3055                         ResourceLoaderModule::TYPE_SCRIPTS
3056                 );
3057
3058                 return self::getHtmlFromLoaderLinks( $links );
3059         }
3060
3061         /**
3062          * JS stuff to put at the 'bottom', which goes at the bottom of the `<body>`.
3063          * These are modules marked with position 'bottom', legacy scripts ($this->mScripts),
3064          * site JS, and user JS.
3065          *
3066          * @param bool $unused Previously used to let this method change its output based
3067          *  on whether it was called by getExternalHeadScripts() or getBottomScripts().
3068          * @return string
3069          */
3070         function getScriptsForBottomQueue( $unused = null ) {
3071                 // Scripts "only" requests marked for bottom inclusion
3072                 // If we're in the <head>, use load() calls rather than <script src="..."> tags
3073                 $links = array();
3074
3075                 $links[] = $this->makeResourceLoaderLink( $this->getModuleScripts( true, 'bottom' ),
3076                         ResourceLoaderModule::TYPE_SCRIPTS
3077                 );
3078
3079                 // Modules requests - let the client calculate dependencies and batch requests as it likes
3080                 // Only load modules that have marked themselves for loading at the bottom
3081                 $modules = $this->getModules( true, 'bottom' );
3082                 if ( $modules ) {
3083                         $links[] = ResourceLoader::makeInlineScript(
3084                                 Xml::encodeJsCall( 'mw.loader.load', array( $modules ) )
3085                         );
3086                 }
3087
3088                 // Legacy Scripts
3089                 $links[] = $this->mScripts;
3090
3091                 // Add user JS if enabled
3092                 // This must use TYPE_COMBINED instead of only=scripts so that its request is handled by
3093                 // mw.loader.implement() which ensures that execution is scheduled after the "site" module.
3094                 if ( $this->getConfig()->get( 'AllowUserJs' )
3095                         && $this->getUser()->isLoggedIn()
3096                         && $this->getTitle()
3097                         && $this->getTitle()->isJsSubpage()
3098                         && $this->userCanPreview()
3099                 ) {
3100                         // We're on a preview of a JS subpage. Exclude this page from the user module (T28283)
3101                         // and include the draft contents as a raw script instead.
3102                         $links[] = $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_COMBINED,
3103                                 array( 'excludepage' => $this->getTitle()->getPrefixedDBkey() )
3104                         );
3105                         // Load the previewed JS
3106                         $links[] = ResourceLoader::makeInlineScript(
3107                                 Xml::encodeJsCall( 'mw.loader.using', array(
3108                                         array( 'user', 'site' ),
3109                                         new XmlJsCode(
3110                                                 'function () {'
3111                                                         . Xml::encodeJsCall( '$.globalEval', array(
3112                                                                 $this->getRequest()->getText( 'wpTextbox1' )
3113                                                         ) )
3114                                                         . '}'
3115                                         )
3116                                 ) )
3117                         );
3118
3119                         // FIXME: If the user is previewing, say, ./vector.js, his ./common.js will be loaded
3120                         // asynchronously and may arrive *after* the inline script here. So the previewed code
3121                         // may execute before ./common.js runs. Normally, ./common.js runs before ./vector.js.
3122                         // Similarly, when previewing ./common.js and the user module does arrive first,
3123                         // it will arrive without common.js and the inline script runs after.
3124                         // Thus running common after the excluded subpage.
3125                 } else {
3126                         // Include the user module normally, i.e., raw to avoid it being wrapped in a closure.
3127                         $links[] = $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_COMBINED );
3128                 }
3129
3130                 // Group JS is only enabled if site JS is enabled.
3131                 $links[] = $this->makeResourceLoaderLink(
3132                         'user.groups',
3133                         ResourceLoaderModule::TYPE_COMBINED
3134                 );
3135
3136                 return self::getHtmlFromLoaderLinks( $links );
3137         }
3138
3139         /**
3140          * JS stuff to put at the bottom of the "<body>"
3141          * @return string
3142          */
3143         function getBottomScripts() {
3144                 return $this->getScriptsForBottomQueue();
3145         }
3146
3147         /**
3148          * Get the javascript config vars to include on this page
3149          *
3150          * @return array Array of javascript config vars
3151          * @since 1.23
3152          */
3153         public function getJsConfigVars() {
3154                 return $this->mJsConfigVars;
3155         }
3156
3157         /**
3158          * Add one or more variables to be set in mw.config in JavaScript
3159          *
3160          * @param string|array $keys Key or array of key/value pairs
3161          * @param mixed $value [optional] Value of the configuration variable
3162          */
3163         public function addJsConfigVars( $keys, $value = null ) {
3164                 if ( is_array( $keys ) ) {
3165                         foreach ( $keys as $key => $value ) {
3166                                 $this->mJsConfigVars[$key] = $value;
3167                         }
3168                         return;
3169                 }
3170
3171                 $this->mJsConfigVars[$keys] = $value;
3172         }
3173
3174         /**
3175          * Get an array containing the variables to be set in mw.config in JavaScript.
3176          *
3177          * Do not add things here which can be evaluated in ResourceLoaderStartUpModule
3178          * - in other words, page-independent/site-wide variables (without state).
3179          * You will only be adding bloat to the html page and causing page caches to
3180          * have to be purged on configuration changes.
3181          * @return array
3182          */
3183         public function getJSVars() {
3184                 global $wgContLang;
3185
3186                 $curRevisionId = 0;
3187                 $articleId = 0;
3188                 $canonicalSpecialPageName = false; # bug 21115
3189
3190                 $title = $this->getTitle();
3191                 $ns = $title->getNamespace();
3192                 $canonicalNamespace = MWNamespace::exists( $ns )
3193                         ? MWNamespace::getCanonicalName( $ns )
3194                         : $title->getNsText();
3195
3196                 $sk = $this->getSkin();
3197                 // Get the relevant title so that AJAX features can use the correct page name
3198                 // when making API requests from certain special pages (bug 34972).
3199                 $relevantTitle = $sk->getRelevantTitle();
3200                 $relevantUser = $sk->getRelevantUser();
3201
3202                 if ( $ns == NS_SPECIAL ) {
3203                         list( $canonicalSpecialPageName, /*...*/ ) =
3204                                 SpecialPageFactory::resolveAlias( $title->getDBkey() );
3205                 } elseif ( $this->canUseWikiPage() ) {
3206                         $wikiPage = $this->getWikiPage();
3207                         $curRevisionId = $wikiPage->getLatest();
3208                         $articleId = $wikiPage->getId();
3209                 }
3210
3211                 $lang = $title->getPageLanguage();
3212
3213                 // Pre-process information
3214                 $separatorTransTable = $lang->separatorTransformTable();
3215                 $separatorTransTable = $separatorTransTable ? $separatorTransTable : array();
3216                 $compactSeparatorTransTable = array(
3217                         implode( "\t", array_keys( $separatorTransTable ) ),
3218                         implode( "\t", $separatorTransTable ),
3219                 );
3220                 $digitTransTable = $lang->digitTransformTable();
3221                 $digitTransTable = $digitTransTable ? $digitTransTable : array();
3222                 $compactDigitTransTable = array(
3223                         implode( "\t", array_keys( $digitTransTable ) ),
3224                         implode( "\t", $digitTransTable ),
3225                 );
3226
3227                 $user = $this->getUser();
3228
3229                 $vars = array(
3230                         'wgCanonicalNamespace' => $canonicalNamespace,
3231                         'wgCanonicalSpecialPageName' => $canonicalSpecialPageName,
3232                         'wgNamespaceNumber' => $title->getNamespace(),
3233                         'wgPageName' => $title->getPrefixedDBkey(),
3234                         'wgTitle' => $title->getText(),
3235                         'wgCurRevisionId' => $curRevisionId,
3236                         'wgRevisionId' => (int)$this->getRevisionId(),
3237                         'wgArticleId' => $articleId,
3238                         'wgIsArticle' => $this->isArticle(),
3239                         'wgIsRedirect' => $title->isRedirect(),
3240                         'wgAction' => Action::getActionName( $this->getContext() ),
3241                         'wgUserName' => $user->isAnon() ? null : $user->getName(),
3242                         'wgUserGroups' => $user->getEffectiveGroups(),
3243                         'wgCategories' => $this->getCategories(),
3244                         'wgBreakFrames' => $this->getFrameOptions() == 'DENY',
3245                         'wgPageContentLanguage' => $lang->getCode(),
3246                         'wgPageContentModel' => $title->getContentModel(),
3247                         'wgSeparatorTransformTable' => $compactSeparatorTransTable,
3248                         'wgDigitTransformTable' => $compactDigitTransTable,
3249                         'wgDefaultDateFormat' => $lang->getDefaultDateFormat(),
3250                         'wgMonthNames' => $lang->getMonthNamesArray(),
3251                         'wgMonthNamesShort' => $lang->getMonthAbbreviationsArray(),
3252                         'wgRelevantPageName' => $relevantTitle->getPrefixedDBkey(),
3253                         'wgRelevantArticleId' => $relevantTitle->getArticleId(),
3254                 );
3255
3256                 if ( $user->isLoggedIn() ) {
3257                         $vars['wgUserId'] = $user->getId();
3258                         $vars['wgUserEditCount'] = $user->getEditCount();
3259                         $userReg = wfTimestampOrNull( TS_UNIX, $user->getRegistration() );
3260                         $vars['wgUserRegistration'] = $userReg !== null ? ( $userReg * 1000 ) : null;
3261                         // Get the revision ID of the oldest new message on the user's talk
3262                         // page. This can be used for constructing new message alerts on
3263                         // the client side.
3264                         $vars['wgUserNewMsgRevisionId'] = $user->getNewMessageRevisionId();
3265                 }
3266
3267                 if ( $wgContLang->hasVariants() ) {
3268                         $vars['wgUserVariant'] = $wgContLang->getPreferredVariant();
3269                 }
3270                 // Same test as SkinTemplate
3271                 $vars['wgIsProbablyEditable'] = $title->quickUserCan( 'edit', $user )
3272                         && ( $title->exists() || $title->quickUserCan( 'create', $user ) );
3273
3274                 foreach ( $title->getRestrictionTypes() as $type ) {
3275                         $vars['wgRestriction' . ucfirst( $type )] = $title->getRestrictions( $type );
3276                 }
3277
3278                 if ( $title->isMainPage() ) {
3279                         $vars['wgIsMainPage'] = true;
3280                 }
3281
3282                 if ( $this->mRedirectedFrom ) {
3283                         $vars['wgRedirectedFrom'] = $this->mRedirectedFrom->getPrefixedDBkey();
3284                 }
3285
3286                 if ( $relevantUser ) {
3287                         $vars['wgRelevantUserName'] = $relevantUser->getName();
3288                 }
3289
3290                 // Allow extensions to add their custom variables to the mw.config map.
3291                 // Use the 'ResourceLoaderGetConfigVars' hook if the variable is not
3292                 // page-dependant but site-wide (without state).
3293                 // Alternatively, you may want to use OutputPage->addJsConfigVars() instead.
3294                 Hooks::run( 'MakeGlobalVariablesScript', array( &$vars, $this ) );
3295
3296                 // Merge in variables from addJsConfigVars last
3297                 return array_merge( $vars, $this->getJsConfigVars() );
3298         }
3299
3300         /**
3301          * To make it harder for someone to slip a user a fake
3302          * user-JavaScript or user-CSS preview, a random token
3303          * is associated with the login session. If it's not
3304          * passed back with the preview request, we won't render
3305          * the code.
3306          *
3307          * @return bool
3308          */
3309         public function userCanPreview() {
3310                 $request = $this->getRequest();
3311                 if (
3312                         $request->getVal( 'action' ) !== 'submit' ||
3313                         !$request->getCheck( 'wpPreview' ) ||
3314                         !$request->wasPosted()
3315                 ) {
3316                         return false;
3317                 }
3318
3319                 $user = $this->getUser();
3320                 if ( !$user->matchEditToken( $request->getVal( 'wpEditToken' ) ) ) {
3321                         return false;
3322                 }
3323
3324                 $title = $this->getTitle();
3325                 if ( !$title->isJsSubpage() && !$title->isCssSubpage() ) {
3326                         return false;
3327                 }
3328                 if ( !$title->isSubpageOf( $user->getUserPage() ) ) {
3329                         // Don't execute another user's CSS or JS on preview (T85855)
3330                         return false;
3331                 }
3332
3333                 $errors = $title->getUserPermissionsErrors( 'edit', $user );
3334                 if ( count( $errors ) !== 0 ) {
3335                         return false;
3336                 }
3337
3338                 return true;
3339         }
3340
3341         /**
3342          * @return array Array in format "link name or number => 'link html'".
3343          */
3344         public function getHeadLinksArray() {
3345                 global $wgVersion;
3346
3347                 $tags = array();
3348                 $config = $this->getConfig();
3349
3350                 $canonicalUrl = $this->mCanonicalUrl;
3351
3352                 $tags['meta-generator'] = Html::element( 'meta', array(
3353                         'name' => 'generator',
3354                         'content' => "MediaWiki $wgVersion",
3355                 ) );
3356
3357                 if ( $config->get( 'ReferrerPolicy' ) !== false ) {
3358                         $tags['meta-referrer'] = Html::element( 'meta', array(
3359                                 'name' => 'referrer',
3360                                 'content' => $config->get( 'ReferrerPolicy' )
3361                         ) );
3362                 }
3363
3364                 $p = "{$this->mIndexPolicy},{$this->mFollowPolicy}";
3365                 if ( $p !== 'index,follow' ) {
3366                         // http://www.robotstxt.org/wc/meta-user.html
3367                         // Only show if it's different from the default robots policy
3368                         $tags['meta-robots'] = Html::element( 'meta', array(
3369                                 'name' => 'robots',
3370                                 'content' => $p,
3371                         ) );
3372                 }
3373
3374                 foreach ( $this->mMetatags as $tag ) {
3375                         if ( 0 == strcasecmp( 'http:', substr( $tag[0], 0, 5 ) ) ) {
3376                                 $a = 'http-equiv';
3377                                 $tag[0] = substr( $tag[0], 5 );
3378                         } else {
3379                                 $a = 'name';
3380                         }
3381                         $tagName = "meta-{$tag[0]}";
3382                         if ( isset( $tags[$tagName] ) ) {
3383                                 $tagName .= $tag[1];
3384                         }
3385                         $tags[$tagName] = Html::element( 'meta',
3386                                 array(
3387                                         $a => $tag[0],
3388                                         'content' => $tag[1]
3389                                 )
3390                         );
3391                 }
3392
3393                 foreach ( $this->mLinktags as $tag ) {
3394                         $tags[] = Html::element( 'link', $tag );
3395                 }
3396
3397                 # Universal edit button
3398                 if ( $config->get( 'UniversalEditButton' ) && $this->isArticleRelated() ) {
3399                         $user = $this->getUser();
3400                         if ( $this->getTitle()->quickUserCan( 'edit', $user )
3401                                 && ( $this->getTitle()->exists() ||
3402                                         $this->getTitle()->quickUserCan( 'create', $user ) )
3403                         ) {
3404                                 // Original UniversalEditButton
3405                                 $msg = $this->msg( 'edit' )->text();
3406                                 $tags['universal-edit-button'] = Html::element( 'link', array(
3407                                         'rel' => 'alternate',
3408                                         'type' => 'application/x-wiki',
3409                                         'title' => $msg,
3410                                         'href' => $this->getTitle()->getEditURL(),
3411                                 ) );
3412                                 // Alternate edit link
3413                                 $tags['alternative-edit'] = Html::element( 'link', array(
3414                                         'rel' => 'edit',
3415                                         'title' => $msg,
3416                                         'href' => $this->getTitle()->getEditURL(),
3417                                 ) );
3418                         }
3419                 }
3420
3421                 # Generally the order of the favicon and apple-touch-icon links
3422                 # should not matter, but Konqueror (3.5.9 at least) incorrectly
3423                 # uses whichever one appears later in the HTML source. Make sure
3424                 # apple-touch-icon is specified first to avoid this.
3425                 if ( $config->get( 'AppleTouchIcon' ) !== false ) {
3426                         $tags['apple-touch-icon'] = Html::element( 'link', array(
3427                                 'rel' => 'apple-touch-icon',
3428                                 'href' => $config->get( 'AppleTouchIcon' )
3429                         ) );
3430                 }
3431
3432                 if ( $config->get( 'Favicon' ) !== false ) {
3433                         $tags['favicon'] = Html::element( 'link', array(
3434                                 'rel' => 'shortcut icon',
3435                                 'href' => $config->get( 'Favicon' )
3436                         ) );
3437                 }
3438
3439                 # OpenSearch description link
3440                 $tags['opensearch'] = Html::element( 'link', array(
3441                         'rel' => 'search',
3442                         'type' => 'application/opensearchdescription+xml',
3443                         'href' => wfScript( 'opensearch_desc' ),
3444                         'title' => $this->msg( 'opensearch-desc' )->inContentLanguage()->text(),
3445                 ) );
3446
3447                 if ( $config->get( 'EnableAPI' ) ) {
3448                         # Real Simple Discovery link, provides auto-discovery information
3449                         # for the MediaWiki API (and potentially additional custom API
3450                         # support such as WordPress or Twitter-compatible APIs for a
3451                         # blogging extension, etc)
3452                         $tags['rsd'] = Html::element( 'link', array(
3453                                 'rel' => 'EditURI',
3454                                 'type' => 'application/rsd+xml',
3455                                 // Output a protocol-relative URL here if $wgServer is protocol-relative.
3456                                 // Whether RSD accepts relative or protocol-relative URLs is completely
3457                                 // undocumented, though.
3458                                 'href' => wfExpandUrl( wfAppendQuery(
3459                                         wfScript( 'api' ),
3460                                         array( 'action' => 'rsd' ) ),
3461                                         PROTO_RELATIVE
3462                                 ),
3463                         ) );
3464                 }
3465
3466                 # Language variants
3467                 if ( !$config->get( 'DisableLangConversion' ) ) {
3468                         $lang = $this->getTitle()->getPageLanguage();
3469                         if ( $lang->hasVariants() ) {
3470                                 $variants = $lang->getVariants();
3471                                 foreach ( $variants as $variant ) {
3472                                         $tags["variant-$variant"] = Html::element( 'link', array(
3473                                                 'rel' => 'alternate',
3474                                                 'hreflang' => wfBCP47( $variant ),
3475                                                 'href' => $this->getTitle()->getLocalURL(
3476                                                         array( 'variant' => $variant ) )
3477                                                 )
3478                                         );
3479                                 }
3480                                 # x-default link per https://support.google.com/webmasters/answer/189077?hl=en
3481                                 $tags["variant-x-default"] = Html::element( 'link', array(
3482                                         'rel' => 'alternate',
3483                                         'hreflang' => 'x-default',
3484                                         'href' => $this->getTitle()->getLocalURL() ) );
3485                         }
3486                 }
3487
3488                 # Copyright
3489                 if ( $this->copyrightUrl !== null ) {
3490                         $copyright = $this->copyrightUrl;
3491                 } else {
3492                         $copyright = '';
3493                         if ( $config->get( 'RightsPage' ) ) {
3494                                 $copy = Title::newFromText( $config->get( 'RightsPage' ) );
3495
3496                                 if ( $copy ) {
3497                                         $copyright = $copy->getLocalURL();
3498                                 }
3499                         }
3500
3501                         if ( !$copyright && $config->get( 'RightsUrl' ) ) {
3502                                 $copyright = $config->get( 'RightsUrl' );
3503                         }
3504                 }
3505
3506                 if ( $copyright ) {
3507                         $tags['copyright'] = Html::element( 'link', array(
3508                                 'rel' => 'copyright',
3509                                 'href' => $copyright )
3510                         );
3511                 }
3512
3513                 # Feeds
3514                 if ( $config->get( 'Feed' ) ) {
3515                         foreach ( $this->getSyndicationLinks() as $format => $link ) {
3516                                 # Use the page name for the title.  In principle, this could
3517                                 # lead to issues with having the same name for different feeds
3518                                 # corresponding to the same page, but we can't avoid that at
3519                                 # this low a level.
3520
3521                                 $tags[] = $this->feedLink(
3522                                         $format,
3523                                         $link,
3524                                         # Used messages: 'page-rss-feed' and 'page-atom-feed' (for an easier grep)
3525                                         $this->msg(
3526                                                 "page-{$format}-feed", $this->getTitle()->getPrefixedText()
3527                                         )->text()
3528                                 );
3529                         }
3530
3531                         # Recent changes feed should appear on every page (except recentchanges,
3532                         # that would be redundant). Put it after the per-page feed to avoid
3533                         # changing existing behavior. It's still available, probably via a
3534                         # menu in your browser. Some sites might have a different feed they'd
3535                         # like to promote instead of the RC feed (maybe like a "Recent New Articles"
3536                         # or "Breaking news" one). For this, we see if $wgOverrideSiteFeed is defined.
3537                         # If so, use it instead.
3538                         $sitename = $config->get( 'Sitename' );
3539                         if ( $config->get( 'OverrideSiteFeed' ) ) {
3540                                 foreach ( $config->get( 'OverrideSiteFeed' ) as $type => $feedUrl ) {
3541                                         // Note, this->feedLink escapes the url.
3542                                         $tags[] = $this->feedLink(
3543                                                 $type,
3544                                                 $feedUrl,
3545                                                 $this->msg( "site-{$type}-feed", $sitename )->text()
3546                                         );
3547                                 }
3548                         } elseif ( !$this->getTitle()->isSpecial( 'Recentchanges' ) ) {
3549                                 $rctitle = SpecialPage::getTitleFor( 'Recentchanges' );
3550                                 foreach ( $config->get( 'AdvertisedFeedTypes' ) as $format ) {
3551                                         $tags[] = $this->feedLink(
3552                                                 $format,
3553                                                 $rctitle->getLocalURL( array( 'feed' => $format ) ),
3554                                                 # For grep: 'site-rss-feed', 'site-atom-feed'
3555                                                 $this->msg( "site-{$format}-feed", $sitename )->text()
3556                                         );
3557                                 }
3558                         }
3559                 }
3560
3561                 # Canonical URL
3562                 if ( $config->get( 'EnableCanonicalServerLink' ) ) {
3563                         if ( $canonicalUrl !== false ) {
3564                                 $canonicalUrl = wfExpandUrl( $canonicalUrl, PROTO_CANONICAL );
3565                         } else {
3566                                 if ( $this->isArticleRelated() ) {
3567                                         // This affects all requests where "setArticleRelated" is true. This is
3568                                         // typically all requests that show content (query title, curid, oldid, diff),
3569                                         // and all wikipage actions (edit, delete, purge, info, history etc.).
3570                                         // It does not apply to File pages and Special pages.
3571                                         // 'history' and 'info' actions address page metadata rather than the page
3572                                         // content itself, so they may not be canonicalized to the view page url.
3573                                         // TODO: this ought to be better encapsulated in the Action class.
3574                                         $action = Action::getActionName( $this->getContext() );
3575                                         if ( in_array( $action, array( 'history', 'info' ) ) ) {
3576                                                 $query = "action={$action}";
3577                                         } else {
3578                                                 $query = '';
3579                                         }
3580                                         $canonicalUrl = $this->getTitle()->getCanonicalURL( $query );
3581                                 } else {
3582                                         $reqUrl = $this->getRequest()->getRequestURL();
3583                                         $canonicalUrl = wfExpandUrl( $reqUrl, PROTO_CANONICAL );
3584                                 }
3585                         }
3586                 }
3587                 if ( $canonicalUrl !== false ) {
3588                         $tags[] = Html::element( 'link', array(
3589                                 'rel' => 'canonical',
3590                                 'href' => $canonicalUrl
3591                         ) );
3592                 }
3593
3594                 return $tags;
3595         }
3596
3597         /**
3598          * @return string HTML tag links to be put in the header.
3599          * @deprecated since 1.24 Use OutputPage::headElement or if you have to,
3600          *   OutputPage::getHeadLinksArray directly.
3601          */
3602         public function getHeadLinks() {
3603                 wfDeprecated( __METHOD__, '1.24' );
3604                 return implode( "\n", $this->getHeadLinksArray() );
3605         }
3606
3607         /**
3608          * Generate a "<link rel/>" for a feed.
3609          *
3610          * @param string $type Feed type
3611          * @param string $url URL to the feed
3612          * @param string $text Value of the "title" attribute
3613          * @return string HTML fragment
3614          */
3615         private function feedLink( $type, $url, $text ) {
3616                 return Html::element( 'link', array(
3617                         'rel' => 'alternate',
3618                         'type' => "application/$type+xml",
3619                         'title' => $text,
3620                         'href' => $url )
3621                 );
3622         }
3623
3624         /**
3625          * Add a local or specified stylesheet, with the given media options.
3626          * Internal use only. Use OutputPage::addModuleStyles() if possible.
3627          *
3628          * @param string $style URL to the file
3629          * @param string $media To specify a media type, 'screen', 'printable', 'handheld' or any.
3630          * @param string $condition For IE conditional comments, specifying an IE version
3631          * @param string $dir Set to 'rtl' or 'ltr' for direction-specific sheets
3632          */
3633         public function addStyle( $style, $media = '', $condition = '', $dir = '' ) {
3634                 $options = array();
3635                 // Even though we expect the media type to be lowercase, but here we
3636                 // force it to lowercase to be safe.
3637                 if ( $media ) {
3638                         $options['media'] = $media;
3639                 }
3640                 if ( $condition ) {
3641                         $options['condition'] = $condition;
3642                 }
3643                 if ( $dir ) {
3644                         $options['dir'] = $dir;
3645                 }
3646                 $this->styles[$style] = $options;
3647         }
3648
3649         /**
3650          * Adds inline CSS styles
3651          * Internal use only. Use OutputPage::addModuleStyles() if possible.
3652          *
3653          * @param mixed $style_css Inline CSS
3654          * @param string $flip Set to 'flip' to flip the CSS if needed
3655          */
3656         public function addInlineStyle( $style_css, $flip = 'noflip' ) {
3657                 if ( $flip === 'flip' && $this->getLanguage()->isRTL() ) {
3658                         # If wanted, and the interface is right-to-left, flip the CSS
3659                         $style_css = CSSJanus::transform( $style_css, true, false );
3660                 }
3661                 $this->mInlineStyles .= Html::inlineStyle( $style_css ) . "\n";
3662         }
3663
3664         /**
3665          * Build a set of "<link>" elements for the stylesheets specified in the $this->styles array.
3666          * These will be applied to various media & IE conditionals.
3667          *
3668          * @return string
3669          */
3670         public function buildCssLinks() {
3671                 global $wgContLang;
3672
3673                 $this->getSkin()->setupSkinUserCss( $this );
3674
3675                 // Add ResourceLoader styles
3676                 // Split the styles into these groups
3677                 $styles = array(
3678                         'other' => array(),
3679                         'user' => array(),
3680                         'site' => array(),
3681                         'private' => array(),
3682                         'noscript' => array()
3683                 );
3684                 $links = array();
3685                 $otherTags = array(); // Tags to append after the normal <link> tags
3686                 $resourceLoader = $this->getResourceLoader();
3687
3688                 $moduleStyles = $this->getModuleStyles();
3689
3690                 // Per-site custom styles
3691                 $moduleStyles[] = 'site';
3692                 $moduleStyles[] = 'noscript';
3693                 $moduleStyles[] = 'user.groups';
3694
3695                 // Per-user custom styles
3696                 if ( $this->getConfig()->get( 'AllowUserCss' ) && $this->getTitle()->isCssSubpage()
3697                         && $this->userCanPreview()
3698                 ) {
3699                         // We're on a preview of a CSS subpage
3700                         // Exclude this page from the user module in case it's in there (bug 26283)
3701                         $link = $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_STYLES,
3702                                 array( 'excludepage' => $this->getTitle()->getPrefixedDBkey() )
3703                         );
3704                         $otherTags = array_merge( $otherTags, $link['html'] );
3705
3706                         // Load the previewed CSS
3707                         // If needed, Janus it first. This is user-supplied CSS, so it's
3708                         // assumed to be right for the content language directionality.
3709                         $previewedCSS = $this->getRequest()->getText( 'wpTextbox1' );
3710                         if ( $this->getLanguage()->getDir() !== $wgContLang->getDir() ) {
3711                                 $previewedCSS = CSSJanus::transform( $previewedCSS, true, false );
3712                         }
3713                         $otherTags[] = Html::inlineStyle( $previewedCSS ) . "\n";
3714                 } else {
3715                         // Load the user styles normally
3716                         $moduleStyles[] = 'user';
3717                 }
3718
3719                 // Per-user preference styles
3720                 $moduleStyles[] = 'user.cssprefs';
3721
3722                 foreach ( $moduleStyles as $name ) {
3723                         $module = $resourceLoader->getModule( $name );
3724                         if ( !$module ) {
3725                                 continue;
3726                         }
3727                         if ( $name === 'site' ) {
3728                                 // HACK: The site module shouldn't be fragmented with a cache group and
3729                                 // http request. But in order to ensure its styles are separated and after the
3730                                 // ResourceLoaderDynamicStyles marker, pretend it is in a group called 'site'.
3731                                 // The scripts remain ungrouped and rides the bottom queue.
3732                                 $styles['site'][] = $name;
3733                                 continue;
3734                         }
3735                         $group = $module->getGroup();
3736                         // Modules in groups other than the ones needing special treatment
3737                         // (see $styles assignment)
3738                         // will be placed in the "other" style category.
3739                         $styles[isset( $styles[$group] ) ? $group : 'other'][] = $name;
3740                 }
3741
3742                 // We want site, private and user styles to override dynamically added
3743                 // styles from modules, but we want dynamically added styles to override
3744                 // statically added styles from other modules. So the order has to be
3745                 // other, dynamic, site, private, user. Add statically added styles for
3746                 // other modules
3747                 $links[] = $this->makeResourceLoaderLink(
3748                         $styles['other'],
3749                         ResourceLoaderModule::TYPE_STYLES
3750                 );
3751                 // Add normal styles added through addStyle()/addInlineStyle() here
3752                 $links[] = implode( "\n", $this->buildCssLinksArray() ) . $this->mInlineStyles;
3753                 // Add marker tag to mark the place where the client-side
3754                 // loader should inject dynamic styles
3755                 // We use a <meta> tag with a made-up name for this because that's valid HTML
3756                 $links[] = Html::element(
3757                         'meta',
3758                         array( 'name' => 'ResourceLoaderDynamicStyles', 'content' => '' )
3759                 );
3760
3761                 // Add site-specific and user-specific styles
3762                 // 'private' at present only contains user.options, so put that before 'user'
3763                 // Any future private modules will likely have a similar user-specific character
3764                 foreach ( array( 'site', 'noscript', 'private', 'user' ) as $group ) {
3765                         $links[] = $this->makeResourceLoaderLink( $styles[$group],
3766                                 ResourceLoaderModule::TYPE_STYLES
3767                         );
3768                 }
3769
3770                 // Add stuff in $otherTags (previewed user CSS if applicable)
3771                 return self::getHtmlFromLoaderLinks( $links ) . implode( '', $otherTags );
3772         }
3773
3774         /**
3775          * @return array
3776          */
3777         public function buildCssLinksArray() {
3778                 $links = array();
3779
3780                 // Add any extension CSS
3781                 foreach ( $this->mExtStyles as $url ) {
3782                         $this->addStyle( $url );
3783                 }
3784                 $this->mExtStyles = array();
3785
3786                 foreach ( $this->styles as $file => $options ) {
3787                         $link = $this->styleLink( $file, $options );
3788                         if ( $link ) {
3789                                 $links[$file] = $link;
3790                         }
3791                 }
3792                 return $links;
3793         }
3794
3795         /**
3796          * Generate \<link\> tags for stylesheets
3797          *
3798          * @param string $style URL to the file
3799          * @param array $options Option, can contain 'condition', 'dir', 'media' keys
3800          * @return string HTML fragment
3801          */
3802         protected function styleLink( $style, array $options ) {
3803                 if ( isset( $options['dir'] ) ) {
3804                         if ( $this->getLanguage()->getDir() != $options['dir'] ) {
3805                                 return '';
3806                         }
3807                 }
3808
3809                 if ( isset( $options['media'] ) ) {
3810                         $media = self::transformCssMedia( $options['media'] );
3811                         if ( is_null( $media ) ) {
3812                                 return '';
3813                         }
3814                 } else {
3815                         $media = 'all';
3816                 }
3817
3818                 if ( substr( $style, 0, 1 ) == '/' ||
3819                         substr( $style, 0, 5 ) == 'http:' ||
3820                         substr( $style, 0, 6 ) == 'https:' ) {
3821                         $url = $style;
3822                 } else {
3823                         $config = $this->getConfig();
3824                         $url = $config->get( 'StylePath' ) . '/' . $style . '?' .
3825                                 $config->get( 'StyleVersion' );
3826                 }
3827
3828                 $link = Html::linkedStyle( $url, $media );
3829
3830                 if ( isset( $options['condition'] ) ) {
3831                         $condition = htmlspecialchars( $options['condition'] );
3832                         $link = "<!--[if $condition]>$link<![endif]-->";
3833                 }
3834                 return $link;
3835         }
3836
3837         /**
3838          * Transform "media" attribute based on request parameters
3839          *
3840          * @param string $media Current value of the "media" attribute
3841          * @return string Modified value of the "media" attribute, or null to skip
3842          * this stylesheet
3843          */
3844         public static function transformCssMedia( $media ) {
3845                 global $wgRequest;
3846
3847                 // http://www.w3.org/TR/css3-mediaqueries/#syntax
3848                 $screenMediaQueryRegex = '/^(?:only\s+)?screen\b/i';
3849
3850                 // Switch in on-screen display for media testing
3851                 $switches = array(
3852                         'printable' => 'print',
3853                         'handheld' => 'handheld',
3854                 );
3855                 foreach ( $switches as $switch => $targetMedia ) {
3856                         if ( $wgRequest->getBool( $switch ) ) {
3857                                 if ( $media == $targetMedia ) {
3858                                         $media = '';
3859                                 } elseif ( preg_match( $screenMediaQueryRegex, $media ) === 1 ) {
3860                                         /* This regex will not attempt to understand a comma-separated media_query_list
3861                                          *
3862                                          * Example supported values for $media:
3863                                          * 'screen', 'only screen', 'screen and (min-width: 982px)' ),
3864                                          * Example NOT supported value for $media:
3865                                          * '3d-glasses, screen, print and resolution > 90dpi'
3866                                          *
3867                                          * If it's a print request, we never want any kind of screen stylesheets
3868                                          * If it's a handheld request (currently the only other choice with a switch),
3869                                          * we don't want simple 'screen' but we might want screen queries that
3870                                          * have a max-width or something, so we'll pass all others on and let the
3871                                          * client do the query.
3872                                          */
3873                                         if ( $targetMedia == 'print' || $media == 'screen' ) {
3874                                                 return null;
3875                                         }
3876                                 }
3877                         }
3878                 }
3879
3880                 return $media;
3881         }
3882
3883         /**
3884          * Add a wikitext-formatted message to the output.
3885          * This is equivalent to:
3886          *
3887          *    $wgOut->addWikiText( wfMessage( ... )->plain() )
3888          */
3889         public function addWikiMsg( /*...*/ ) {
3890                 $args = func_get_args();
3891                 $name = array_shift( $args );
3892                 $this->addWikiMsgArray( $name, $args );
3893         }
3894
3895         /**
3896          * Add a wikitext-formatted message to the output.
3897          * Like addWikiMsg() except the parameters are taken as an array
3898          * instead of a variable argument list.
3899          *
3900          * @param string $name
3901          * @param array $args
3902          */
3903         public function addWikiMsgArray( $name, $args ) {
3904                 $this->addHTML( $this->msg( $name, $args )->parseAsBlock() );
3905         }
3906
3907         /**
3908          * This function takes a number of message/argument specifications, wraps them in
3909          * some overall structure, and then parses the result and adds it to the output.
3910          *
3911          * In the $wrap, $1 is replaced with the first message, $2 with the second,
3912          * and so on. The subsequent arguments may be either
3913          * 1) strings, in which case they are message names, or
3914          * 2) arrays, in which case, within each array, the first element is the message
3915          *    name, and subsequent elements are the parameters to that message.
3916          *
3917          * Don't use this for messages that are not in the user's interface language.
3918          *
3919          * For example:
3920          *
3921          *    $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>", 'some-error' );
3922          *
3923          * Is equivalent to:
3924          *
3925          *    $wgOut->addWikiText( "<div class='error'>\n"
3926          *        . wfMessage( 'some-error' )->plain() . "\n</div>" );
3927          *
3928          * The newline after the opening div is needed in some wikitext. See bug 19226.
3929          *
3930          * @param string $wrap
3931          */
3932         public function wrapWikiMsg( $wrap /*, ...*/ ) {
3933                 $msgSpecs = func_get_args();
3934                 array_shift( $msgSpecs );
3935                 $msgSpecs = array_values( $msgSpecs );
3936                 $s = $wrap;
3937                 foreach ( $msgSpecs as $n => $spec ) {
3938                         if ( is_array( $spec ) ) {
3939                                 $args = $spec;
3940                                 $name = array_shift( $args );
3941                                 if ( isset( $args['options'] ) ) {
3942                                         unset( $args['options'] );
3943                                         wfDeprecated(
3944                                                 'Adding "options" to ' . __METHOD__ . ' is no longer supported',
3945                                                 '1.20'
3946                                         );
3947                                 }
3948                         } else {
3949                                 $args = array();
3950                                 $name = $spec;
3951                         }
3952                         $s = str_replace( '$' . ( $n + 1 ), $this->msg( $name, $args )->plain(), $s );
3953                 }
3954                 $this->addWikiText( $s );
3955         }
3956
3957         /**
3958          * Include jQuery core. Use this to avoid loading it multiple times
3959          * before we get a usable script loader.
3960          *
3961          * @param array $modules List of jQuery modules which should be loaded
3962          * @return array The list of modules which were not loaded.
3963          * @since 1.16
3964          * @deprecated since 1.17
3965          */
3966         public function includeJQuery( array $modules = array() ) {
3967                 wfDeprecated( __METHOD__, '1.17' );
3968                 return array();
3969         }
3970
3971         /**
3972          * Enables/disables TOC, doesn't override __NOTOC__
3973          * @param bool $flag
3974          * @since 1.22
3975          */
3976         public function enableTOC( $flag = true ) {
3977                 $this->mEnableTOC = $flag;
3978         }
3979
3980         /**
3981          * @return bool
3982          * @since 1.22
3983          */
3984         public function isTOCEnabled() {
3985                 return $this->mEnableTOC;
3986         }
3987
3988         /**
3989          * Enables/disables section edit links, doesn't override __NOEDITSECTION__
3990          * @param bool $flag
3991          * @since 1.23
3992          */
3993         public function enableSectionEditLinks( $flag = true ) {
3994                 $this->mEnableSectionEditLinks = $flag;
3995         }
3996
3997         /**
3998          * @return bool
3999          * @since 1.23
4000          */
4001         public function sectionEditLinksEnabled() {
4002                 return $this->mEnableSectionEditLinks;
4003         }
4004
4005         /**
4006          * Helper function to setup the PHP implementation of OOUI to use in this request.
4007          *
4008          * @since 1.26
4009          * @param String $skinName The Skin name to determine the correct OOUI theme
4010          * @param String $dir Language direction
4011          */
4012         public static function setupOOUI( $skinName = '', $dir = 'ltr' ) {
4013                 $themes = ExtensionRegistry::getInstance()->getAttribute( 'SkinOOUIThemes' );
4014                 // Make keys (skin names) lowercase for case-insensitive matching.
4015                 $themes = array_change_key_case( $themes, CASE_LOWER );
4016                 $theme = isset( $themes[$skinName] ) ? $themes[$skinName] : 'MediaWiki';
4017                 // For example, 'OOUI\MediaWikiTheme'.
4018                 $themeClass = "OOUI\\{$theme}Theme";
4019                 OOUI\Theme::setSingleton( new $themeClass() );
4020                 OOUI\Element::setDefaultDir( $dir );
4021         }
4022
4023         /**
4024          * Add ResourceLoader module styles for OOUI and set up the PHP implementation of it for use with
4025          * MediaWiki and this OutputPage instance.
4026          *
4027          * @since 1.25
4028          */
4029         public function enableOOUI() {
4030                 self::setupOOUI(
4031                         strtolower( $this->getSkin()->getSkinName() ),
4032                         $this->getLanguage()->getDir()
4033                 );
4034                 $this->addModuleStyles( array(
4035                         'oojs-ui.styles',
4036                         'oojs-ui.styles.icons',
4037                         'oojs-ui.styles.indicators',
4038                         'oojs-ui.styles.textures',
4039                         'mediawiki.widgets.styles',
4040                 ) );
4041         }
4042 }