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 MediaWiki\MediaWikiServices;
  25 use MediaWiki\Session\SessionManager;
  26 use WrappedString\WrappedString;
  27 use WrappedString\WrappedStringList;
  28
  29 /**
  30  * This class should be covered by a general architecture document which does
  31  * not exist as of January 2011.  This is one of the Core classes and should
  32  * be read at least once by any new developers.
  33  *
  34  * This class is used to prepare the final rendering. A skin is then
  35  * applied to the output parameters (links, javascript, html, categories ...).
  36  *
  37  * @todo FIXME: Another class handles sending the whole page to the client.
  38  *
  39  * Some comments comes from a pairing session between Zak Greant and Antoine Musso
  40  * in November 2010.
  41  *
  42  * @todo document
  43  */
  44 class OutputPage extends ContextSource {
  45         /** @var array Should be private. Used with addMeta() which adds "<meta>" */
  46         protected $mMetatags = [];
  47
  48         /** @var array */
  49         protected $mLinktags = [];
  50
  51         /** @var bool */
  52         protected $mCanonicalUrl = false;
  53
  54         /**
  55          * @var array Additional stylesheets. Looks like this is for extensions.
  56          *   Might be replaced by ResourceLoader.
  57          */
  58         protected $mExtStyles = [];
  59
  60         /**
  61          * @var string Should be private - has getter and setter. Contains
  62          *   the HTML title */
  63         public $mPagetitle = '';
  64
  65         /**
  66          * @var string Contains all of the "<body>" content. Should be private we
  67          *   got set/get accessors and the append() method.
  68          */
  69         public $mBodytext = '';
  70
  71         /** @var string Stores contents of "<title>" tag */
  72         private $mHTMLtitle = '';
  73
  74         /**
  75          * @var bool Is the displayed content related to the source of the
  76          *   corresponding wiki article.
  77          */
  78         private $mIsarticle = false;
  79
  80         /** @var bool Stores "article flag" toggle. */
  81         private $mIsArticleRelated = true;
  82
  83         /**
  84          * @var bool We have to set isPrintable(). Some pages should
  85          * never be printed (ex: redirections).
  86          */
  87         private $mPrintable = false;
  88
  89         /**
  90          * @var array Contains the page subtitle. Special pages usually have some
  91          *   links here. Don't confuse with site subtitle added by skins.
  92          */
  93         private $mSubtitle = [];
  94
  95         /** @var string */
  96         public $mRedirect = '';
  97
  98         /** @var int */
  99         protected $mStatusCode;
 100
 101         /**
 102          * @var string Used for sending cache control.
 103          *   The whole caching system should probably be moved into its own class.
 104          */
 105         protected $mLastModified = '';
 106
 107         /** @var array */
 108         protected $mCategoryLinks = [];
 109
 110         /** @var array */
 111         protected $mCategories = [
 112                 'hidden' => [],
 113                 'normal' => [],
 114         ];
 115
 116         /** @var array */
 117         protected $mIndicators = [];
 118
 119         /** @var array Array of Interwiki Prefixed (non DB key) Titles (e.g. 'fr:Test page') */
 120         private $mLanguageLinks = [];
 121
 122         /**
 123          * Used for JavaScript (predates ResourceLoader)
 124          * @todo We should split JS / CSS.
 125          * mScripts content is inserted as is in "<head>" by Skin. This might
 126          * contain either a link to a stylesheet or inline CSS.
 127          */
 128         private $mScripts = '';
 129
 130         /** @var string Inline CSS styles. Use addInlineStyle() sparingly */
 131         protected $mInlineStyles = '';
 132
 133         /**
 134          * @var string Used by skin template.
 135          * Example: $tpl->set( 'displaytitle', $out->mPageLinkTitle );
 136          */
 137         public $mPageLinkTitle = '';
 138
 139         /** @var array Array of elements in "<head>". Parser might add its own headers! */
 140         protected $mHeadItems = [];
 141
 142         /** @var array */
 143         protected $mModules = [];
 144
 145         /** @var array */
 146         protected $mModuleScripts = [];
 147
 148         /** @var array */
 149         protected $mModuleStyles = [];
 150
 151         /** @var ResourceLoader */
 152         protected $mResourceLoader;
 153
 154         /** @var ResourceLoaderClientHtml */
 155         private $rlClient;
 156
 157         /** @var ResourceLoaderContext */
 158         private $rlClientContext;
 159
 160         /** @var string */
 161         private $rlUserModuleState;
 162
 163         /** @var array */
 164         private $rlExemptStyleModules;
 165
 166         /** @var array */
 167         protected $mJsConfigVars = [];
 168
 169         /** @var array */
 170         protected $mTemplateIds = [];
 171
 172         /** @var array */
 173         protected $mImageTimeKeys = [];
 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 = [
 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 = [];
 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 int Cache stuff. Looks like mEnableClientCache */
 233         protected $mCdnMaxage = 0;
 234         /** @var int Upper limit on mCdnMaxage */
 235         protected $mCdnMaxageLimit = INF;
 236
 237         /**
 238          * @var bool Controls if anti-clickjacking / frame-breaking headers will
 239          * be sent. This should be done for pages where edit actions are possible.
 240          * Setters: $this->preventClickjacking() and $this->allowClickjacking().
 241          */
 242         protected $mPreventClickjacking = true;
 243
 244         /** @var int To include the variable {{REVISIONID}} */
 245         private $mRevisionId = null;
 246
 247         /** @var string */
 248         private $mRevisionTimestamp = null;
 249
 250         /** @var array */
 251         protected $mFileVersion = null;
 252
 253         /**
 254          * @var array An array of stylesheet filenames (relative from skins path),
 255          * with options for CSS media, IE conditions, and RTL/LTR direction.
 256          * For internal use; add settings in the skin via $this->addStyle()
 257          *
 258          * Style again! This seems like a code duplication since we already have
 259          * mStyles. This is what makes Open Source amazing.
 260          */
 261         protected $styles = [];
 262
 263         private $mIndexPolicy = 'index';
 264         private $mFollowPolicy = 'follow';
 265         private $mVaryHeader = [
 266                 'Accept-Encoding' => [ 'match=gzip' ],
 267         ];
 268
 269         /**
 270          * If the current page was reached through a redirect, $mRedirectedFrom contains the Title
 271          * of the redirect.
 272          *
 273          * @var Title
 274          */
 275         private $mRedirectedFrom = null;
 276
 277         /**
 278          * Additional key => value data
 279          */
 280         private $mProperties = [];
 281
 282         /**
 283          * @var string|null ResourceLoader target for load.php links. If null, will be omitted
 284          */
 285         private $mTarget = null;
 286
 287         /**
 288          * @var bool Whether parser output should contain table of contents
 289          */
 290         private $mEnableTOC = true;
 291
 292         /**
 293          * @var bool Whether parser output should contain section edit links
 294          */
 295         private $mEnableSectionEditLinks = true;
 296
 297         /**
 298          * @var string|null The URL to send in a <link> element with rel=copyright
 299          */
 300         private $copyrightUrl;
 301
 302         /**
 303          * Constructor for OutputPage. This should not be called directly.
 304          * Instead a new RequestContext should be created and it will implicitly create
 305          * a OutputPage tied to that context.
 306          * @param IContextSource|null $context
 307          */
 308         function __construct( IContextSource $context = null ) {
 309                 if ( $context === null ) {
 310                         # Extensions should use `new RequestContext` instead of `new OutputPage` now.
 311                         wfDeprecated( __METHOD__, '1.18' );
 312                 } else {
 313                         $this->setContext( $context );
 314                 }
 315         }
 316
 317         /**
 318          * Redirect to $url rather than displaying the normal page
 319          *
 320          * @param string $url URL
 321          * @param string $responsecode HTTP status code
 322          */
 323         public function redirect( $url, $responsecode = '302' ) {
 324                 # Strip newlines as a paranoia check for header injection in PHP<5.1.2
 325                 $this->mRedirect = str_replace( "\n", '', $url );
 326                 $this->mRedirectCode = $responsecode;
 327         }
 328
 329         /**
 330          * Get the URL to redirect to, or an empty string if not redirect URL set
 331          *
 332          * @return string
 333          */
 334         public function getRedirect() {
 335                 return $this->mRedirect;
 336         }
 337
 338         /**
 339          * Set the copyright URL to send with the output.
 340          * Empty string to omit, null to reset.
 341          *
 342          * @since 1.26
 343          *
 344          * @param string|null $url
 345          */
 346         public function setCopyrightUrl( $url ) {
 347                 $this->copyrightUrl = $url;
 348         }
 349
 350         /**
 351          * Set the HTTP status code to send with the output.
 352          *
 353          * @param int $statusCode
 354          */
 355         public function setStatusCode( $statusCode ) {
 356                 $this->mStatusCode = $statusCode;
 357         }
 358
 359         /**
 360          * Add a new "<meta>" tag
 361          * To add an http-equiv meta tag, precede the name with "http:"
 362          *
 363          * @param string $name Tag name
 364          * @param string $val Tag value
 365          */
 366         function addMeta( $name, $val ) {
 367                 array_push( $this->mMetatags, [ $name, $val ] );
 368         }
 369
 370         /**
 371          * Returns the current <meta> tags
 372          *
 373          * @since 1.25
 374          * @return array
 375          */
 376         public function getMetaTags() {
 377                 return $this->mMetatags;
 378         }
 379
 380         /**
 381          * Add a new \<link\> tag to the page header.
 382          *
 383          * Note: use setCanonicalUrl() for rel=canonical.
 384          *
 385          * @param array $linkarr Associative array of attributes.
 386          */
 387         function addLink( array $linkarr ) {
 388                 array_push( $this->mLinktags, $linkarr );
 389         }
 390
 391         /**
 392          * Returns the current <link> tags
 393          *
 394          * @since 1.25
 395          * @return array
 396          */
 397         public function getLinkTags() {
 398                 return $this->mLinktags;
 399         }
 400
 401         /**
 402          * Add a new \<link\> with "rel" attribute set to "meta"
 403          *
 404          * @param array $linkarr Associative array mapping attribute names to their
 405          *                 values, both keys and values will be escaped, and the
 406          *                 "rel" attribute will be automatically added
 407          */
 408         function addMetadataLink( array $linkarr ) {
 409                 $linkarr['rel'] = $this->getMetadataAttribute();
 410                 $this->addLink( $linkarr );
 411         }
 412
 413         /**
 414          * Set the URL to be used for the <link rel=canonical>. This should be used
 415          * in preference to addLink(), to avoid duplicate link tags.
 416          * @param string $url
 417          */
 418         function setCanonicalUrl( $url ) {
 419                 $this->mCanonicalUrl = $url;
 420         }
 421
 422         /**
 423          * Returns the URL to be used for the <link rel=canonical> if
 424          * one is set.
 425          *
 426          * @since 1.25
 427          * @return bool|string
 428          */
 429         public function getCanonicalUrl() {
 430                 return $this->mCanonicalUrl;
 431         }
 432
 433         /**
 434          * Get the value of the "rel" attribute for metadata links
 435          *
 436          * @return string
 437          */
 438         public function getMetadataAttribute() {
 439                 # note: buggy CC software only reads first "meta" link
 440                 static $haveMeta = false;
 441                 if ( $haveMeta ) {
 442                         return 'alternate meta';
 443                 } else {
 444                         $haveMeta = true;
 445                         return 'meta';
 446                 }
 447         }
 448
 449         /**
 450          * Add raw HTML to the list of scripts (including \<script\> tag, etc.)
 451          * Internal use only. Use OutputPage::addModules() or OutputPage::addJsConfigVars()
 452          * if possible.
 453          *
 454          * @param string $script Raw HTML
 455          */
 456         function addScript( $script ) {
 457                 $this->mScripts .= $script;
 458         }
 459
 460         /**
 461          * Register and add a stylesheet from an extension directory.
 462          *
 463          * @deprecated since 1.27 use addModuleStyles() or addStyle() instead
 464          * @param string $url Path to sheet.  Provide either a full url (beginning
 465          *             with 'http', etc) or a relative path from the document root
 466          *             (beginning with '/').  Otherwise it behaves identically to
 467          *             addStyle() and draws from the /skins folder.
 468          */
 469         public function addExtensionStyle( $url ) {
 470                 wfDeprecated( __METHOD__, '1.27' );
 471                 array_push( $this->mExtStyles, $url );
 472         }
 473
 474         /**
 475          * Get all styles added by extensions
 476          *
 477          * @deprecated since 1.27
 478          * @return array
 479          */
 480         function getExtStyle() {
 481                 wfDeprecated( __METHOD__, '1.27' );
 482                 return $this->mExtStyles;
 483         }
 484
 485         /**
 486          * Add a JavaScript file out of skins/common, or a given relative path.
 487          * Internal use only. Use OutputPage::addModules() if possible.
 488          *
 489          * @param string $file Filename in skins/common or complete on-server path
 490          *              (/foo/bar.js)
 491          * @param string $version Style version of the file. Defaults to $wgStyleVersion
 492          */
 493         public function addScriptFile( $file, $version = null ) {
 494                 // See if $file parameter is an absolute URL or begins with a slash
 495                 if ( substr( $file, 0, 1 ) == '/' || preg_match( '#^[a-z]*://#i', $file ) ) {
 496                         $path = $file;
 497                 } else {
 498                         $path = $this->getConfig()->get( 'StylePath' ) . "/common/{$file}";
 499                 }
 500                 if ( is_null( $version ) ) {
 501                         $version = $this->getConfig()->get( 'StyleVersion' );
 502                 }
 503                 $this->addScript( Html::linkedScript( wfAppendQuery( $path, $version ) ) );
 504         }
 505
 506         /**
 507          * Add a self-contained script tag with the given contents
 508          * Internal use only. Use OutputPage::addModules() if possible.
 509          *
 510          * @param string $script JavaScript text, no script tags
 511          */
 512         public function addInlineScript( $script ) {
 513                 $this->mScripts .= Html::inlineScript( $script );
 514         }
 515
 516         /**
 517          * Filter an array of modules to remove insufficiently trustworthy members, and modules
 518          * which are no longer registered (eg a page is cached before an extension is disabled)
 519          * @param array $modules
 520          * @param string|null $position If not null, only return modules with this position
 521          * @param string $type
 522          * @return array
 523          */
 524         protected function filterModules( array $modules, $position = null,
 525                 $type = ResourceLoaderModule::TYPE_COMBINED
 526         ) {
 527                 $resourceLoader = $this->getResourceLoader();
 528                 $filteredModules = [];
 529                 foreach ( $modules as $val ) {
 530                         $module = $resourceLoader->getModule( $val );
 531                         if ( $module instanceof ResourceLoaderModule
 532                                 && $module->getOrigin() <= $this->getAllowedModules( $type )
 533                                 && ( is_null( $position ) || $module->getPosition() == $position )
 534                                 && ( !$this->mTarget || in_array( $this->mTarget, $module->getTargets() ) )
 535                         ) {
 536                                 $filteredModules[] = $val;
 537                         }
 538                 }
 539                 return $filteredModules;
 540         }
 541
 542         /**
 543          * Get the list of modules to include on this page
 544          *
 545          * @param bool $filter Whether to filter out insufficiently trustworthy modules
 546          * @param string|null $position If not null, only return modules with this position
 547          * @param string $param
 548          * @return array Array of module names
 549          */
 550         public function getModules( $filter = false, $position = null, $param = 'mModules',
 551                 $type = ResourceLoaderModule::TYPE_COMBINED
 552         ) {
 553                 $modules = array_values( array_unique( $this->$param ) );
 554                 return $filter
 555                         ? $this->filterModules( $modules, $position, $type )
 556                         : $modules;
 557         }
 558
 559         /**
 560          * Add one or more modules recognized by ResourceLoader. Modules added
 561          * through this function will be loaded by ResourceLoader when the
 562          * page loads.
 563          *
 564          * @param string|array $modules Module name (string) or array of module names
 565          */
 566         public function addModules( $modules ) {
 567                 $this->mModules = array_merge( $this->mModules, (array)$modules );
 568         }
 569
 570         /**
 571          * Get the list of module JS to include on this page
 572          *
 573          * @param bool $filter
 574          * @param string|null $position
 575          * @return array Array of module names
 576          */
 577         public function getModuleScripts( $filter = false, $position = null ) {
 578                 return $this->getModules( $filter, $position, 'mModuleScripts',
 579                         ResourceLoaderModule::TYPE_SCRIPTS
 580                 );
 581         }
 582
 583         /**
 584          * Add only JS of one or more modules recognized by ResourceLoader. Module
 585          * scripts added through this function will be loaded by ResourceLoader when
 586          * the page loads.
 587          *
 588          * @param string|array $modules Module name (string) or array of module names
 589          */
 590         public function addModuleScripts( $modules ) {
 591                 $this->mModuleScripts = array_merge( $this->mModuleScripts, (array)$modules );
 592         }
 593
 594         /**
 595          * Get the list of module CSS to include on this page
 596          *
 597          * @param bool $filter
 598          * @param string|null $position
 599          * @return array Array of module names
 600          */
 601         public function getModuleStyles( $filter = false, $position = null ) {
 602                 return $this->getModules( $filter, $position, 'mModuleStyles',
 603                         ResourceLoaderModule::TYPE_STYLES
 604                 );
 605         }
 606
 607         /**
 608          * Add only CSS of one or more modules recognized by ResourceLoader.
 609          *
 610          * Module styles added through this function will be added using standard link CSS
 611          * tags, rather than as a combined Javascript and CSS package. Thus, they will
 612          * load when JavaScript is disabled (unless CSS also happens to be disabled).
 613          *
 614          * @param string|array $modules Module name (string) or array of module names
 615          */
 616         public function addModuleStyles( $modules ) {
 617                 $this->mModuleStyles = array_merge( $this->mModuleStyles, (array)$modules );
 618         }
 619
 620         /**
 621          * @return null|string ResourceLoader target
 622          */
 623         public function getTarget() {
 624                 return $this->mTarget;
 625         }
 626
 627         /**
 628          * Sets ResourceLoader target for load.php links. If null, will be omitted
 629          *
 630          * @param string|null $target
 631          */
 632         public function setTarget( $target ) {
 633                 $this->mTarget = $target;
 634         }
 635
 636         /**
 637          * Get an array of head items
 638          *
 639          * @return array
 640          */
 641         function getHeadItemsArray() {
 642                 return $this->mHeadItems;
 643         }
 644
 645         /**
 646          * Add or replace a head item to the output
 647          *
 648          * Whenever possible, use more specific options like ResourceLoader modules,
 649          * OutputPage::addLink(), OutputPage::addMetaLink() and OutputPage::addFeedLink()
 650          * Fallback options for those are: OutputPage::addStyle, OutputPage::addScript(),
 651          * OutputPage::addInlineScript() and OutputPage::addInlineStyle()
 652          * This would be your very LAST fallback.
 653          *
 654          * @param string $name Item name
 655          * @param string $value Raw HTML
 656          */
 657         public function addHeadItem( $name, $value ) {
 658                 $this->mHeadItems[$name] = $value;
 659         }
 660
 661         /**
 662          * Add one or more head items to the output
 663          *
 664          * @since 1.28
 665          * @param string|string[] $value Raw HTML
 666          */
 667         public function addHeadItems( $values ) {
 668                 $this->mHeadItems = array_merge( $this->mHeadItems, (array)$values );
 669         }
 670
 671         /**
 672          * Check if the header item $name is already set
 673          *
 674          * @param string $name Item name
 675          * @return bool
 676          */
 677         public function hasHeadItem( $name ) {
 678                 return isset( $this->mHeadItems[$name] );
 679         }
 680
 681         /**
 682          * @deprecated since 1.28 Obsolete - wgUseETag experiment was removed.
 683          * @param string $tag
 684          */
 685         public function setETag( $tag ) {
 686         }
 687
 688         /**
 689          * Set whether the output should only contain the body of the article,
 690          * without any skin, sidebar, etc.
 691          * Used e.g. when calling with "action=render".
 692          *
 693          * @param bool $only Whether to output only the body of the article
 694          */
 695         public function setArticleBodyOnly( $only ) {
 696                 $this->mArticleBodyOnly = $only;
 697         }
 698
 699         /**
 700          * Return whether the output will contain only the body of the article
 701          *
 702          * @return bool
 703          */
 704         public function getArticleBodyOnly() {
 705                 return $this->mArticleBodyOnly;
 706         }
 707
 708         /**
 709          * Set an additional output property
 710          * @since 1.21
 711          *
 712          * @param string $name
 713          * @param mixed $value
 714          */
 715         public function setProperty( $name, $value ) {
 716                 $this->mProperties[$name] = $value;
 717         }
 718
 719         /**
 720          * Get an additional output property
 721          * @since 1.21
 722          *
 723          * @param string $name
 724          * @return mixed Property value or null if not found
 725          */
 726         public function getProperty( $name ) {
 727                 if ( isset( $this->mProperties[$name] ) ) {
 728                         return $this->mProperties[$name];
 729                 } else {
 730                         return null;
 731                 }
 732         }
 733
 734         /**
 735          * checkLastModified tells the client to use the client-cached page if
 736          * possible. If successful, the OutputPage is disabled so that
 737          * any future call to OutputPage->output() have no effect.
 738          *
 739          * Side effect: sets mLastModified for Last-Modified header
 740          *
 741          * @param string $timestamp
 742          *
 743          * @return bool True if cache-ok headers was sent.
 744          */
 745         public function checkLastModified( $timestamp ) {
 746                 if ( !$timestamp || $timestamp == '19700101000000' ) {
 747                         wfDebug( __METHOD__ . ": CACHE DISABLED, NO TIMESTAMP\n" );
 748                         return false;
 749                 }
 750                 $config = $this->getConfig();
 751                 if ( !$config->get( 'CachePages' ) ) {
 752                         wfDebug( __METHOD__ . ": CACHE DISABLED\n" );
 753                         return false;
 754                 }
 755
 756                 $timestamp = wfTimestamp( TS_MW, $timestamp );
 757                 $modifiedTimes = [
 758                         'page' => $timestamp,
 759                         'user' => $this->getUser()->getTouched(),
 760                         'epoch' => $config->get( 'CacheEpoch' )
 761                 ];
 762                 if ( $config->get( 'UseSquid' ) ) {
 763                         // bug 44570: the core page itself may not change, but resources might
 764                         $modifiedTimes['sepoch'] = wfTimestamp( TS_MW, time() - $config->get( 'SquidMaxage' ) );
 765                 }
 766                 Hooks::run( 'OutputPageCheckLastModified', [ &$modifiedTimes, $this ] );
 767
 768                 $maxModified = max( $modifiedTimes );
 769                 $this->mLastModified = wfTimestamp( TS_RFC2822, $maxModified );
 770
 771                 $clientHeader = $this->getRequest()->getHeader( 'If-Modified-Since' );
 772                 if ( $clientHeader === false ) {
 773                         wfDebug( __METHOD__ . ": client did not send If-Modified-Since header", 'private' );
 774                         return false;
 775                 }
 776
 777                 # IE sends sizes after the date like this:
 778                 # Wed, 20 Aug 2003 06:51:19 GMT; length=5202
 779                 # this breaks strtotime().
 780                 $clientHeader = preg_replace( '/;.*$/', '', $clientHeader );
 781
 782                 MediaWiki\suppressWarnings(); // E_STRICT system time bitching
 783                 $clientHeaderTime = strtotime( $clientHeader );
 784                 MediaWiki\restoreWarnings();
 785                 if ( !$clientHeaderTime ) {
 786                         wfDebug( __METHOD__
 787                                 . ": unable to parse the client's If-Modified-Since header: $clientHeader\n" );
 788                         return false;
 789                 }
 790                 $clientHeaderTime = wfTimestamp( TS_MW, $clientHeaderTime );
 791
 792                 # Make debug info
 793                 $info = '';
 794                 foreach ( $modifiedTimes as $name => $value ) {
 795                         if ( $info !== '' ) {
 796                                 $info .= ', ';
 797                         }
 798                         $info .= "$name=" . wfTimestamp( TS_ISO_8601, $value );
 799                 }
 800
 801                 wfDebug( __METHOD__ . ": client sent If-Modified-Since: " .
 802                         wfTimestamp( TS_ISO_8601, $clientHeaderTime ), 'private' );
 803                 wfDebug( __METHOD__ . ": effective Last-Modified: " .
 804                         wfTimestamp( TS_ISO_8601, $maxModified ), 'private' );
 805                 if ( $clientHeaderTime < $maxModified ) {
 806                         wfDebug( __METHOD__ . ": STALE, $info", 'private' );
 807                         return false;
 808                 }
 809
 810                 # Not modified
 811                 # Give a 304 Not Modified response code and disable body output
 812                 wfDebug( __METHOD__ . ": NOT MODIFIED, $info", 'private' );
 813                 ini_set( 'zlib.output_compression', 0 );
 814                 $this->getRequest()->response()->statusHeader( 304 );
 815                 $this->sendCacheControl();
 816                 $this->disable();
 817
 818                 // Don't output a compressed blob when using ob_gzhandler;
 819                 // it's technically against HTTP spec and seems to confuse
 820                 // Firefox when the response gets split over two packets.
 821                 wfClearOutputBuffers();
 822
 823                 return true;
 824         }
 825
 826         /**
 827          * Override the last modified timestamp
 828          *
 829          * @param string $timestamp New timestamp, in a format readable by
 830          *        wfTimestamp()
 831          */
 832         public function setLastModified( $timestamp ) {
 833                 $this->mLastModified = wfTimestamp( TS_RFC2822, $timestamp );
 834         }
 835
 836         /**
 837          * Set the robot policy for the page: <http://www.robotstxt.org/meta.html>
 838          *
 839          * @param string $policy The literal string to output as the contents of
 840          *   the meta tag.  Will be parsed according to the spec and output in
 841          *   standardized form.
 842          * @return null
 843          */
 844         public function setRobotPolicy( $policy ) {
 845                 $policy = Article::formatRobotPolicy( $policy );
 846
 847                 if ( isset( $policy['index'] ) ) {
 848                         $this->setIndexPolicy( $policy['index'] );
 849                 }
 850                 if ( isset( $policy['follow'] ) ) {
 851                         $this->setFollowPolicy( $policy['follow'] );
 852                 }
 853         }
 854
 855         /**
 856          * Set the index policy for the page, but leave the follow policy un-
 857          * touched.
 858          *
 859          * @param string $policy Either 'index' or 'noindex'.
 860          * @return null
 861          */
 862         public function setIndexPolicy( $policy ) {
 863                 $policy = trim( $policy );
 864                 if ( in_array( $policy, [ 'index', 'noindex' ] ) ) {
 865                         $this->mIndexPolicy = $policy;
 866                 }
 867         }
 868
 869         /**
 870          * Set the follow policy for the page, but leave the index policy un-
 871          * touched.
 872          *
 873          * @param string $policy Either 'follow' or 'nofollow'.
 874          * @return null
 875          */
 876         public function setFollowPolicy( $policy ) {
 877                 $policy = trim( $policy );
 878                 if ( in_array( $policy, [ 'follow', 'nofollow' ] ) ) {
 879                         $this->mFollowPolicy = $policy;
 880                 }
 881         }
 882
 883         /**
 884          * Set the new value of the "action text", this will be added to the
 885          * "HTML title", separated from it with " - ".
 886          *
 887          * @param string $text New value of the "action text"
 888          */
 889         public function setPageTitleActionText( $text ) {
 890                 $this->mPageTitleActionText = $text;
 891         }
 892
 893         /**
 894          * Get the value of the "action text"
 895          *
 896          * @return string
 897          */
 898         public function getPageTitleActionText() {
 899                 return $this->mPageTitleActionText;
 900         }
 901
 902         /**
 903          * "HTML title" means the contents of "<title>".
 904          * It is stored as plain, unescaped text and will be run through htmlspecialchars in the skin file.
 905          *
 906          * @param string|Message $name
 907          */
 908         public function setHTMLTitle( $name ) {
 909                 if ( $name instanceof Message ) {
 910                         $this->mHTMLtitle = $name->setContext( $this->getContext() )->text();
 911                 } else {
 912                         $this->mHTMLtitle = $name;
 913                 }
 914         }
 915
 916         /**
 917          * Return the "HTML title", i.e. the content of the "<title>" tag.
 918          *
 919          * @return string
 920          */
 921         public function getHTMLTitle() {
 922                 return $this->mHTMLtitle;
 923         }
 924
 925         /**
 926          * Set $mRedirectedFrom, the Title of the page which redirected us to the current page.
 927          *
 928          * @param Title $t
 929          */
 930         public function setRedirectedFrom( $t ) {
 931                 $this->mRedirectedFrom = $t;
 932         }
 933
 934         /**
 935          * "Page title" means the contents of \<h1\>. It is stored as a valid HTML
 936          * fragment. This function allows good tags like \<sup\> in the \<h1\> tag,
 937          * but not bad tags like \<script\>. This function automatically sets
 938          * \<title\> to the same content as \<h1\> but with all tags removed. Bad
 939          * tags that were escaped in \<h1\> will still be escaped in \<title\>, and
 940          * good tags like \<i\> will be dropped entirely.
 941          *
 942          * @param string|Message $name
 943          */
 944         public function setPageTitle( $name ) {
 945                 if ( $name instanceof Message ) {
 946                         $name = $name->setContext( $this->getContext() )->text();
 947                 }
 948
 949                 # change "<script>foo&bar</script>" to "&lt;script&gt;foo&amp;bar&lt;/script&gt;"
 950                 # but leave "<i>foobar</i>" alone
 951                 $nameWithTags = Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags( $name ) );
 952                 $this->mPagetitle = $nameWithTags;
 953
 954                 # change "<i>foo&amp;bar</i>" to "foo&bar"
 955                 $this->setHTMLTitle(
 956                         $this->msg( 'pagetitle' )->rawParams( Sanitizer::stripAllTags( $nameWithTags ) )
 957                                 ->inContentLanguage()
 958                 );
 959         }
 960
 961         /**
 962          * Return the "page title", i.e. the content of the \<h1\> tag.
 963          *
 964          * @return string
 965          */
 966         public function getPageTitle() {
 967                 return $this->mPagetitle;
 968         }
 969
 970         /**
 971          * Set the Title object to use
 972          *
 973          * @param Title $t
 974          */
 975         public function setTitle( Title $t ) {
 976                 $this->getContext()->setTitle( $t );
 977         }
 978
 979         /**
 980          * Replace the subtitle with $str
 981          *
 982          * @param string|Message $str New value of the subtitle. String should be safe HTML.
 983          */
 984         public function setSubtitle( $str ) {
 985                 $this->clearSubtitle();
 986                 $this->addSubtitle( $str );
 987         }
 988
 989         /**
 990          * Add $str to the subtitle
 991          *
 992          * @param string|Message $str String or Message to add to the subtitle. String should be safe HTML.
 993          */
 994         public function addSubtitle( $str ) {
 995                 if ( $str instanceof Message ) {
 996                         $this->mSubtitle[] = $str->setContext( $this->getContext() )->parse();
 997                 } else {
 998                         $this->mSubtitle[] = $str;
 999                 }
1000         }
1001
1002         /**
1003          * Build message object for a subtitle containing a backlink to a page
1004          *
1005          * @param Title $title Title to link to
1006          * @param array $query Array of additional parameters to include in the link
1007          * @return Message
1008          * @since 1.25
1009          */
1010         public static function buildBacklinkSubtitle( Title $title, $query = [] ) {
1011                 if ( $title->isRedirect() ) {
1012                         $query['redirect'] = 'no';
1013                 }
1014                 $linkRenderer = MediaWikiServices::getInstance()->getLinkRenderer();
1015                 return wfMessage( 'backlinksubtitle' )
1016                         ->rawParams( $linkRenderer->makeLink( $title, null, [], $query ) );
1017         }
1018
1019         /**
1020          * Add a subtitle containing a backlink to a page
1021          *
1022          * @param Title $title Title to link to
1023          * @param array $query Array of additional parameters to include in the link
1024          */
1025         public function addBacklinkSubtitle( Title $title, $query = [] ) {
1026                 $this->addSubtitle( self::buildBacklinkSubtitle( $title, $query ) );
1027         }
1028
1029         /**
1030          * Clear the subtitles
1031          */
1032         public function clearSubtitle() {
1033                 $this->mSubtitle = [];
1034         }
1035
1036         /**
1037          * Get the subtitle
1038          *
1039          * @return string
1040          */
1041         public function getSubtitle() {
1042                 return implode( "<br />\n\t\t\t\t", $this->mSubtitle );
1043         }
1044
1045         /**
1046          * Set the page as printable, i.e. it'll be displayed with all
1047          * print styles included
1048          */
1049         public function setPrintable() {
1050                 $this->mPrintable = true;
1051         }
1052
1053         /**
1054          * Return whether the page is "printable"
1055          *
1056          * @return bool
1057          */
1058         public function isPrintable() {
1059                 return $this->mPrintable;
1060         }
1061
1062         /**
1063          * Disable output completely, i.e. calling output() will have no effect
1064          */
1065         public function disable() {
1066                 $this->mDoNothing = true;
1067         }
1068
1069         /**
1070          * Return whether the output will be completely disabled
1071          *
1072          * @return bool
1073          */
1074         public function isDisabled() {
1075                 return $this->mDoNothing;
1076         }
1077
1078         /**
1079          * Show an "add new section" link?
1080          *
1081          * @return bool
1082          */
1083         public function showNewSectionLink() {
1084                 return $this->mNewSectionLink;
1085         }
1086
1087         /**
1088          * Forcibly hide the new section link?
1089          *
1090          * @return bool
1091          */
1092         public function forceHideNewSectionLink() {
1093                 return $this->mHideNewSectionLink;
1094         }
1095
1096         /**
1097          * Add or remove feed links in the page header
1098          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
1099          * for the new version
1100          * @see addFeedLink()
1101          *
1102          * @param bool $show True: add default feeds, false: remove all feeds
1103          */
1104         public function setSyndicated( $show = true ) {
1105                 if ( $show ) {
1106                         $this->setFeedAppendQuery( false );
1107                 } else {
1108                         $this->mFeedLinks = [];
1109                 }
1110         }
1111
1112         /**
1113          * Add default feeds to the page header
1114          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
1115          * for the new version
1116          * @see addFeedLink()
1117          *
1118          * @param string $val Query to append to feed links or false to output
1119          *        default links
1120          */
1121         public function setFeedAppendQuery( $val ) {
1122                 $this->mFeedLinks = [];
1123
1124                 foreach ( $this->getConfig()->get( 'AdvertisedFeedTypes' ) as $type ) {
1125                         $query = "feed=$type";
1126                         if ( is_string( $val ) ) {
1127                                 $query .= '&' . $val;
1128                         }
1129                         $this->mFeedLinks[$type] = $this->getTitle()->getLocalURL( $query );
1130                 }
1131         }
1132
1133         /**
1134          * Add a feed link to the page header
1135          *
1136          * @param string $format Feed type, should be a key of $wgFeedClasses
1137          * @param string $href URL
1138          */
1139         public function addFeedLink( $format, $href ) {
1140                 if ( in_array( $format, $this->getConfig()->get( 'AdvertisedFeedTypes' ) ) ) {
1141                         $this->mFeedLinks[$format] = $href;
1142                 }
1143         }
1144
1145         /**
1146          * Should we output feed links for this page?
1147          * @return bool
1148          */
1149         public function isSyndicated() {
1150                 return count( $this->mFeedLinks ) > 0;
1151         }
1152
1153         /**
1154          * Return URLs for each supported syndication format for this page.
1155          * @return array Associating format keys with URLs
1156          */
1157         public function getSyndicationLinks() {
1158                 return $this->mFeedLinks;
1159         }
1160
1161         /**
1162          * Will currently always return null
1163          *
1164          * @return null
1165          */
1166         public function getFeedAppendQuery() {
1167                 return $this->mFeedLinksAppendQuery;
1168         }
1169
1170         /**
1171          * Set whether the displayed content is related to the source of the
1172          * corresponding article on the wiki
1173          * Setting true will cause the change "article related" toggle to true
1174          *
1175          * @param bool $v
1176          */
1177         public function setArticleFlag( $v ) {
1178                 $this->mIsarticle = $v;
1179                 if ( $v ) {
1180                         $this->mIsArticleRelated = $v;
1181                 }
1182         }
1183
1184         /**
1185          * Return whether the content displayed page is related to the source of
1186          * the corresponding article on the wiki
1187          *
1188          * @return bool
1189          */
1190         public function isArticle() {
1191                 return $this->mIsarticle;
1192         }
1193
1194         /**
1195          * Set whether this page is related an article on the wiki
1196          * Setting false will cause the change of "article flag" toggle to false
1197          *
1198          * @param bool $v
1199          */
1200         public function setArticleRelated( $v ) {
1201                 $this->mIsArticleRelated = $v;
1202                 if ( !$v ) {
1203                         $this->mIsarticle = false;
1204                 }
1205         }
1206
1207         /**
1208          * Return whether this page is related an article on the wiki
1209          *
1210          * @return bool
1211          */
1212         public function isArticleRelated() {
1213                 return $this->mIsArticleRelated;
1214         }
1215
1216         /**
1217          * Add new language links
1218          *
1219          * @param string[] $newLinkArray Array of interwiki-prefixed (non DB key) titles
1220          *                               (e.g. 'fr:Test page')
1221          */
1222         public function addLanguageLinks( array $newLinkArray ) {
1223                 $this->mLanguageLinks += $newLinkArray;
1224         }
1225
1226         /**
1227          * Reset the language links and add new language links
1228          *
1229          * @param string[] $newLinkArray Array of interwiki-prefixed (non DB key) titles
1230          *                               (e.g. 'fr:Test page')
1231          */
1232         public function setLanguageLinks( array $newLinkArray ) {
1233                 $this->mLanguageLinks = $newLinkArray;
1234         }
1235
1236         /**
1237          * Get the list of language links
1238          *
1239          * @return string[] Array of interwiki-prefixed (non DB key) titles (e.g. 'fr:Test page')
1240          */
1241         public function getLanguageLinks() {
1242                 return $this->mLanguageLinks;
1243         }
1244
1245         /**
1246          * Add an array of categories, with names in the keys
1247          *
1248          * @param array $categories Mapping category name => sort key
1249          */
1250         public function addCategoryLinks( array $categories ) {
1251                 global $wgContLang;
1252
1253                 if ( !is_array( $categories ) || count( $categories ) == 0 ) {
1254                         return;
1255                 }
1256
1257                 $res = $this->addCategoryLinksToLBAndGetResult( $categories );
1258
1259                 # Set all the values to 'normal'.
1260                 $categories = array_fill_keys( array_keys( $categories ), 'normal' );
1261
1262                 # Mark hidden categories
1263                 foreach ( $res as $row ) {
1264                         if ( isset( $row->pp_value ) ) {
1265                                 $categories[$row->page_title] = 'hidden';
1266                         }
1267                 }
1268
1269                 // Avoid PHP 7.1 warning of passing $this by reference
1270                 $outputPage = $this;
1271                 # Add the remaining categories to the skin
1272                 if ( Hooks::run(
1273                         'OutputPageMakeCategoryLinks',
1274                         [ &$outputPage, $categories, &$this->mCategoryLinks ] )
1275                 ) {
1276                         $linkRenderer = MediaWikiServices::getInstance()->getLinkRenderer();
1277                         foreach ( $categories as $category => $type ) {
1278                                 // array keys will cast numeric category names to ints, so cast back to string
1279                                 $category = (string)$category;
1280                                 $origcategory = $category;
1281                                 $title = Title::makeTitleSafe( NS_CATEGORY, $category );
1282                                 if ( !$title ) {
1283                                         continue;
1284                                 }
1285                                 $wgContLang->findVariantLink( $category, $title, true );
1286                                 if ( $category != $origcategory && array_key_exists( $category, $categories ) ) {
1287                                         continue;
1288                                 }
1289                                 $text = $wgContLang->convertHtml( $title->getText() );
1290                                 $this->mCategories[$type][] = $title->getText();
1291                                 $this->mCategoryLinks[$type][] = $linkRenderer->makeLink( $title, new HtmlArmor( $text ) );
1292                         }
1293                 }
1294         }
1295
1296         /**
1297          * @param array $categories
1298          * @return bool|ResultWrapper
1299          */
1300         protected function addCategoryLinksToLBAndGetResult( array $categories ) {
1301                 # Add the links to a LinkBatch
1302                 $arr = [ NS_CATEGORY => $categories ];
1303                 $lb = new LinkBatch;
1304                 $lb->setArray( $arr );
1305
1306                 # Fetch existence plus the hiddencat property
1307                 $dbr = wfGetDB( DB_REPLICA );
1308                 $fields = array_merge(
1309                         LinkCache::getSelectFields(),
1310                         [ 'page_namespace', 'page_title', 'pp_value' ]
1311                 );
1312
1313                 $res = $dbr->select( [ 'page', 'page_props' ],
1314                         $fields,
1315                         $lb->constructSet( 'page', $dbr ),
1316                         __METHOD__,
1317                         [],
1318                         [ 'page_props' => [ 'LEFT JOIN', [
1319                                 'pp_propname' => 'hiddencat',
1320                                 'pp_page = page_id'
1321                         ] ] ]
1322                 );
1323
1324                 # Add the results to the link cache
1325                 $lb->addResultToCache( LinkCache::singleton(), $res );
1326
1327                 return $res;
1328         }
1329
1330         /**
1331          * Reset the category links (but not the category list) and add $categories
1332          *
1333          * @param array $categories Mapping category name => sort key
1334          */
1335         public function setCategoryLinks( array $categories ) {
1336                 $this->mCategoryLinks = [];
1337                 $this->addCategoryLinks( $categories );
1338         }
1339
1340         /**
1341          * Get the list of category links, in a 2-D array with the following format:
1342          * $arr[$type][] = $link, where $type is either "normal" or "hidden" (for
1343          * hidden categories) and $link a HTML fragment with a link to the category
1344          * page
1345          *
1346          * @return array
1347          */
1348         public function getCategoryLinks() {
1349                 return $this->mCategoryLinks;
1350         }
1351
1352         /**
1353          * Get the list of category names this page belongs to.
1354          *
1355          * @param string $type The type of categories which should be returned. Possible values:
1356          *  * all: all categories of all types
1357          *  * hidden: only the hidden categories
1358          *  * normal: all categories, except hidden categories
1359          * @return array Array of strings
1360          */
1361         public function getCategories( $type = 'all' ) {
1362                 if ( $type === 'all' ) {
1363                         $allCategories = [];
1364                         foreach ( $this->mCategories as $categories ) {
1365                                 $allCategories = array_merge( $allCategories, $categories );
1366                         }
1367                         return $allCategories;
1368                 }
1369                 if ( !isset( $this->mCategories[$type] ) ) {
1370                         throw new InvalidArgumentException( 'Invalid category type given: ' . $type );
1371                 }
1372                 return $this->mCategories[$type];
1373         }
1374
1375         /**
1376          * Add an array of indicators, with their identifiers as array
1377          * keys and HTML contents as values.
1378          *
1379          * In case of duplicate keys, existing values are overwritten.
1380          *
1381          * @param array $indicators
1382          * @since 1.25
1383          */
1384         public function setIndicators( array $indicators ) {
1385                 $this->mIndicators = $indicators + $this->mIndicators;
1386                 // Keep ordered by key
1387                 ksort( $this->mIndicators );
1388         }
1389
1390         /**
1391          * Get the indicators associated with this page.
1392          *
1393          * The array will be internally ordered by item keys.
1394          *
1395          * @return array Keys: identifiers, values: HTML contents
1396          * @since 1.25
1397          */
1398         public function getIndicators() {
1399                 return $this->mIndicators;
1400         }
1401
1402         /**
1403          * Adds help link with an icon via page indicators.
1404          * Link target can be overridden by a local message containing a wikilink:
1405          * the message key is: lowercase action or special page name + '-helppage'.
1406          * @param string $to Target MediaWiki.org page title or encoded URL.
1407          * @param bool $overrideBaseUrl Whether $url is a full URL, to avoid MW.o.
1408          * @since 1.25
1409          */
1410         public function addHelpLink( $to, $overrideBaseUrl = false ) {
1411                 $this->addModuleStyles( 'mediawiki.helplink' );
1412                 $text = $this->msg( 'helppage-top-gethelp' )->escaped();
1413
1414                 if ( $overrideBaseUrl ) {
1415                         $helpUrl = $to;
1416                 } else {
1417                         $toUrlencoded = wfUrlencode( str_replace( ' ', '_', $to ) );
1418                         $helpUrl = "//www.mediawiki.org/wiki/Special:MyLanguage/$toUrlencoded";
1419                 }
1420
1421                 $link = Html::rawElement(
1422                         'a',
1423                         [
1424                                 'href' => $helpUrl,
1425                                 'target' => '_blank',
1426                                 'class' => 'mw-helplink',
1427                         ],
1428                         $text
1429                 );
1430
1431                 $this->setIndicators( [ 'mw-helplink' => $link ] );
1432         }
1433
1434         /**
1435          * Do not allow scripts which can be modified by wiki users to load on this page;
1436          * only allow scripts bundled with, or generated by, the software.
1437          * Site-wide styles are controlled by a config setting, since they can be
1438          * used to create a custom skin/theme, but not user-specific ones.
1439          *
1440          * @todo this should be given a more accurate name
1441          */
1442         public function disallowUserJs() {
1443                 $this->reduceAllowedModules(
1444                         ResourceLoaderModule::TYPE_SCRIPTS,
1445                         ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL
1446                 );
1447
1448                 // Site-wide styles are controlled by a config setting, see bug 71621
1449                 // for background on why. User styles are never allowed.
1450                 if ( $this->getConfig()->get( 'AllowSiteCSSOnRestrictedPages' ) ) {
1451                         $styleOrigin = ResourceLoaderModule::ORIGIN_USER_SITEWIDE;
1452                 } else {
1453                         $styleOrigin = ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL;
1454                 }
1455                 $this->reduceAllowedModules(
1456                         ResourceLoaderModule::TYPE_STYLES,
1457                         $styleOrigin
1458                 );
1459         }
1460
1461         /**
1462          * Show what level of JavaScript / CSS untrustworthiness is allowed on this page
1463          * @see ResourceLoaderModule::$origin
1464          * @param string $type ResourceLoaderModule TYPE_ constant
1465          * @return int ResourceLoaderModule ORIGIN_ class constant
1466          */
1467         public function getAllowedModules( $type ) {
1468                 if ( $type == ResourceLoaderModule::TYPE_COMBINED ) {
1469                         return min( array_values( $this->mAllowedModules ) );
1470                 } else {
1471                         return isset( $this->mAllowedModules[$type] )
1472                                 ? $this->mAllowedModules[$type]
1473                                 : ResourceLoaderModule::ORIGIN_ALL;
1474                 }
1475         }
1476
1477         /**
1478          * Limit the highest level of CSS/JS untrustworthiness allowed.
1479          *
1480          * If passed the same or a higher level than the current level of untrustworthiness set, the
1481          * level will remain unchanged.
1482          *
1483          * @param string $type
1484          * @param int $level ResourceLoaderModule class constant
1485          */
1486         public function reduceAllowedModules( $type, $level ) {
1487                 $this->mAllowedModules[$type] = min( $this->getAllowedModules( $type ), $level );
1488         }
1489
1490         /**
1491          * Prepend $text to the body HTML
1492          *
1493          * @param string $text HTML
1494          */
1495         public function prependHTML( $text ) {
1496                 $this->mBodytext = $text . $this->mBodytext;
1497         }
1498
1499         /**
1500          * Append $text to the body HTML
1501          *
1502          * @param string $text HTML
1503          */
1504         public function addHTML( $text ) {
1505                 $this->mBodytext .= $text;
1506         }
1507
1508         /**
1509          * Shortcut for adding an Html::element via addHTML.
1510          *
1511          * @since 1.19
1512          *
1513          * @param string $element
1514          * @param array $attribs
1515          * @param string $contents
1516          */
1517         public function addElement( $element, array $attribs = [], $contents = '' ) {
1518                 $this->addHTML( Html::element( $element, $attribs, $contents ) );
1519         }
1520
1521         /**
1522          * Clear the body HTML
1523          */
1524         public function clearHTML() {
1525                 $this->mBodytext = '';
1526         }
1527
1528         /**
1529          * Get the body HTML
1530          *
1531          * @return string HTML
1532          */
1533         public function getHTML() {
1534                 return $this->mBodytext;
1535         }
1536
1537         /**
1538          * Get/set the ParserOptions object to use for wikitext parsing
1539          *
1540          * @param ParserOptions|null $options Either the ParserOption to use or null to only get the
1541          *   current ParserOption object
1542          * @return ParserOptions
1543          */
1544         public function parserOptions( $options = null ) {
1545                 if ( $options !== null && !empty( $options->isBogus ) ) {
1546                         // Someone is trying to set a bogus pre-$wgUser PO. Check if it has
1547                         // been changed somehow, and keep it if so.
1548                         $anonPO = ParserOptions::newFromAnon();
1549                         $anonPO->setEditSection( false );
1550                         if ( !$options->matches( $anonPO ) ) {
1551                                 wfLogWarning( __METHOD__ . ': Setting a changed bogus ParserOptions: ' . wfGetAllCallers( 5 ) );
1552                                 $options->isBogus = false;
1553                         }
1554                 }
1555
1556                 if ( !$this->mParserOptions ) {
1557                         if ( !$this->getContext()->getUser()->isSafeToLoad() ) {
1558                                 // $wgUser isn't unstubbable yet, so don't try to get a
1559                                 // ParserOptions for it. And don't cache this ParserOptions
1560                                 // either.
1561                                 $po = ParserOptions::newFromAnon();
1562                                 $po->setEditSection( false );
1563                                 $po->isBogus = true;
1564                                 if ( $options !== null ) {
1565                                         $this->mParserOptions = empty( $options->isBogus ) ? $options : null;
1566                                 }
1567                                 return $po;
1568                         }
1569
1570                         $this->mParserOptions = ParserOptions::newFromContext( $this->getContext() );
1571                         $this->mParserOptions->setEditSection( false );
1572                 }
1573
1574                 if ( $options !== null && !empty( $options->isBogus ) ) {
1575                         // They're trying to restore the bogus pre-$wgUser PO. Do the right
1576                         // thing.
1577                         return wfSetVar( $this->mParserOptions, null, true );
1578                 } else {
1579                         return wfSetVar( $this->mParserOptions, $options );
1580                 }
1581         }
1582
1583         /**
1584          * Set the revision ID which will be seen by the wiki text parser
1585          * for things such as embedded {{REVISIONID}} variable use.
1586          *
1587          * @param int|null $revid An positive integer, or null
1588          * @return mixed Previous value
1589          */
1590         public function setRevisionId( $revid ) {
1591                 $val = is_null( $revid ) ? null : intval( $revid );
1592                 return wfSetVar( $this->mRevisionId, $val );
1593         }
1594
1595         /**
1596          * Get the displayed revision ID
1597          *
1598          * @return int
1599          */
1600         public function getRevisionId() {
1601                 return $this->mRevisionId;
1602         }
1603
1604         /**
1605          * Set the timestamp of the revision which will be displayed. This is used
1606          * to avoid a extra DB call in Skin::lastModified().
1607          *
1608          * @param string|null $timestamp
1609          * @return mixed Previous value
1610          */
1611         public function setRevisionTimestamp( $timestamp ) {
1612                 return wfSetVar( $this->mRevisionTimestamp, $timestamp );
1613         }
1614
1615         /**
1616          * Get the timestamp of displayed revision.
1617          * This will be null if not filled by setRevisionTimestamp().
1618          *
1619          * @return string|null
1620          */
1621         public function getRevisionTimestamp() {
1622                 return $this->mRevisionTimestamp;
1623         }
1624
1625         /**
1626          * Set the displayed file version
1627          *
1628          * @param File|bool $file
1629          * @return mixed Previous value
1630          */
1631         public function setFileVersion( $file ) {
1632                 $val = null;
1633                 if ( $file instanceof File && $file->exists() ) {
1634                         $val = [ 'time' => $file->getTimestamp(), 'sha1' => $file->getSha1() ];
1635                 }
1636                 return wfSetVar( $this->mFileVersion, $val, true );
1637         }
1638
1639         /**
1640          * Get the displayed file version
1641          *
1642          * @return array|null ('time' => MW timestamp, 'sha1' => sha1)
1643          */
1644         public function getFileVersion() {
1645                 return $this->mFileVersion;
1646         }
1647
1648         /**
1649          * Get the templates used on this page
1650          *
1651          * @return array (namespace => dbKey => revId)
1652          * @since 1.18
1653          */
1654         public function getTemplateIds() {
1655                 return $this->mTemplateIds;
1656         }
1657
1658         /**
1659          * Get the files used on this page
1660          *
1661          * @return array (dbKey => array('time' => MW timestamp or null, 'sha1' => sha1 or ''))
1662          * @since 1.18
1663          */
1664         public function getFileSearchOptions() {
1665                 return $this->mImageTimeKeys;
1666         }
1667
1668         /**
1669          * Convert wikitext to HTML and add it to the buffer
1670          * Default assumes that the current page title will be used.
1671          *
1672          * @param string $text
1673          * @param bool $linestart Is this the start of a line?
1674          * @param bool $interface Is this text in the user interface language?
1675          * @throws MWException
1676          */
1677         public function addWikiText( $text, $linestart = true, $interface = true ) {
1678                 $title = $this->getTitle(); // Work around E_STRICT
1679                 if ( !$title ) {
1680                         throw new MWException( 'Title is null' );
1681                 }
1682                 $this->addWikiTextTitle( $text, $title, $linestart, /*tidy*/false, $interface );
1683         }
1684
1685         /**
1686          * Add wikitext with a custom Title object
1687          *
1688          * @param string $text Wikitext
1689          * @param Title $title
1690          * @param bool $linestart Is this the start of a line?
1691          */
1692         public function addWikiTextWithTitle( $text, &$title, $linestart = true ) {
1693                 $this->addWikiTextTitle( $text, $title, $linestart );
1694         }
1695
1696         /**
1697          * Add wikitext with a custom Title object and tidy enabled.
1698          *
1699          * @param string $text Wikitext
1700          * @param Title $title
1701          * @param bool $linestart Is this the start of a line?
1702          */
1703         function addWikiTextTitleTidy( $text, &$title, $linestart = true ) {
1704                 $this->addWikiTextTitle( $text, $title, $linestart, true );
1705         }
1706
1707         /**
1708          * Add wikitext with tidy enabled
1709          *
1710          * @param string $text Wikitext
1711          * @param bool $linestart Is this the start of a line?
1712          */
1713         public function addWikiTextTidy( $text, $linestart = true ) {
1714                 $title = $this->getTitle();
1715                 $this->addWikiTextTitleTidy( $text, $title, $linestart );
1716         }
1717
1718         /**
1719          * Add wikitext with a custom Title object
1720          *
1721          * @param string $text Wikitext
1722          * @param Title $title
1723          * @param bool $linestart Is this the start of a line?
1724          * @param bool $tidy Whether to use tidy
1725          * @param bool $interface Whether it is an interface message
1726          *   (for example disables conversion)
1727          */
1728         public function addWikiTextTitle( $text, Title $title, $linestart,
1729                 $tidy = false, $interface = false
1730         ) {
1731                 global $wgParser;
1732
1733                 $popts = $this->parserOptions();
1734                 $oldTidy = $popts->setTidy( $tidy );
1735                 $popts->setInterfaceMessage( (bool)$interface );
1736
1737                 $parserOutput = $wgParser->getFreshParser()->parse(
1738                         $text, $title, $popts,
1739                         $linestart, true, $this->mRevisionId
1740                 );
1741
1742                 $popts->setTidy( $oldTidy );
1743
1744                 $this->addParserOutput( $parserOutput );
1745         }
1746
1747         /**
1748          * Add a ParserOutput object, but without Html.
1749          *
1750          * @deprecated since 1.24, use addParserOutputMetadata() instead.
1751          * @param ParserOutput $parserOutput
1752          */
1753         public function addParserOutputNoText( $parserOutput ) {
1754                 wfDeprecated( __METHOD__, '1.24' );
1755                 $this->addParserOutputMetadata( $parserOutput );
1756         }
1757
1758         /**
1759          * Add all metadata associated with a ParserOutput object, but without the actual HTML. This
1760          * includes categories, language links, ResourceLoader modules, effects of certain magic words,
1761          * and so on.
1762          *
1763          * @since 1.24
1764          * @param ParserOutput $parserOutput
1765          */
1766         public function addParserOutputMetadata( $parserOutput ) {
1767                 $this->mLanguageLinks += $parserOutput->getLanguageLinks();
1768                 $this->addCategoryLinks( $parserOutput->getCategories() );
1769                 $this->setIndicators( $parserOutput->getIndicators() );
1770                 $this->mNewSectionLink = $parserOutput->getNewSection();
1771                 $this->mHideNewSectionLink = $parserOutput->getHideNewSection();
1772
1773                 if ( !$parserOutput->isCacheable() ) {
1774                         $this->enableClientCache( false );
1775                 }
1776                 $this->mNoGallery = $parserOutput->getNoGallery();
1777                 $this->mHeadItems = array_merge( $this->mHeadItems, $parserOutput->getHeadItems() );
1778                 $this->addModules( $parserOutput->getModules() );
1779                 $this->addModuleScripts( $parserOutput->getModuleScripts() );
1780                 $this->addModuleStyles( $parserOutput->getModuleStyles() );
1781                 $this->addJsConfigVars( $parserOutput->getJsConfigVars() );
1782                 $this->mPreventClickjacking = $this->mPreventClickjacking
1783                         || $parserOutput->preventClickjacking();
1784
1785                 // Template versioning...
1786                 foreach ( (array)$parserOutput->getTemplateIds() as $ns => $dbks ) {
1787                         if ( isset( $this->mTemplateIds[$ns] ) ) {
1788                                 $this->mTemplateIds[$ns] = $dbks + $this->mTemplateIds[$ns];
1789                         } else {
1790                                 $this->mTemplateIds[$ns] = $dbks;
1791                         }
1792                 }
1793                 // File versioning...
1794                 foreach ( (array)$parserOutput->getFileSearchOptions() as $dbk => $data ) {
1795                         $this->mImageTimeKeys[$dbk] = $data;
1796                 }
1797
1798                 // Hooks registered in the object
1799                 $parserOutputHooks = $this->getConfig()->get( 'ParserOutputHooks' );
1800                 foreach ( $parserOutput->getOutputHooks() as $hookInfo ) {
1801                         list( $hookName, $data ) = $hookInfo;
1802                         if ( isset( $parserOutputHooks[$hookName] ) ) {
1803                                 call_user_func( $parserOutputHooks[$hookName], $this, $parserOutput, $data );
1804                         }
1805                 }
1806
1807                 // enable OOUI if requested via ParserOutput
1808                 if ( $parserOutput->getEnableOOUI() ) {
1809                         $this->enableOOUI();
1810                 }
1811
1812                 // Link flags are ignored for now, but may in the future be
1813                 // used to mark individual language links.
1814                 $linkFlags = [];
1815                 // Avoid PHP 7.1 warning of passing $this by reference
1816                 $outputPage = $this;
1817                 Hooks::run( 'LanguageLinks', [ $this->getTitle(), &$this->mLanguageLinks, &$linkFlags ] );
1818                 Hooks::run( 'OutputPageParserOutput', [ &$outputPage, $parserOutput ] );
1819         }
1820
1821         /**
1822          * Add the HTML and enhancements for it (like ResourceLoader modules) associated with a
1823          * ParserOutput object, without any other metadata.
1824          *
1825          * @since 1.24
1826          * @param ParserOutput $parserOutput
1827          */
1828         public function addParserOutputContent( $parserOutput ) {
1829                 $this->addParserOutputText( $parserOutput );
1830
1831                 $this->addModules( $parserOutput->getModules() );
1832                 $this->addModuleScripts( $parserOutput->getModuleScripts() );
1833                 $this->addModuleStyles( $parserOutput->getModuleStyles() );
1834
1835                 $this->addJsConfigVars( $parserOutput->getJsConfigVars() );
1836         }
1837
1838         /**
1839          * Add the HTML associated with a ParserOutput object, without any metadata.
1840          *
1841          * @since 1.24
1842          * @param ParserOutput $parserOutput
1843          */
1844         public function addParserOutputText( $parserOutput ) {
1845                 $text = $parserOutput->getText();
1846                 // Avoid PHP 7.1 warning of passing $this by reference
1847                 $outputPage = $this;
1848                 Hooks::run( 'OutputPageBeforeHTML', [ &$outputPage, &$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( $this->mCdnMaxage );
1961         }
1962
1963         /**
1964          * Get TTL in [$minTTL,$maxTTL] in pass it to lowerCdnMaxage()
1965          *
1966          * This sets and returns $minTTL if $mtime is false or null. Otherwise,
1967          * the TTL is higher the older the $mtime timestamp is. Essentially, the
1968          * TTL is 90% of the age of the object, subject to the min and max.
1969          *
1970          * @param string|integer|float|bool|null $mtime Last-Modified timestamp
1971          * @param integer $minTTL Mimimum TTL in seconds [default: 1 minute]
1972          * @param integer $maxTTL Maximum TTL in seconds [default: $wgSquidMaxage]
1973          * @return integer TTL in seconds
1974          * @since 1.28
1975          */
1976         public function adaptCdnTTL( $mtime, $minTTL = 0, $maxTTL = 0 ) {
1977                 $minTTL = $minTTL ?: IExpiringStore::TTL_MINUTE;
1978                 $maxTTL = $maxTTL ?: $this->getConfig()->get( 'SquidMaxage' );
1979
1980                 if ( $mtime === null || $mtime === false ) {
1981                         return $minTTL; // entity does not exist
1982                 }
1983
1984                 $age = time() - wfTimestamp( TS_UNIX, $mtime );
1985                 $adaptiveTTL = max( .9 * $age, $minTTL );
1986                 $adaptiveTTL = min( $adaptiveTTL, $maxTTL );
1987
1988                 $this->lowerCdnMaxage( (int)$adaptiveTTL );
1989
1990                 return $adaptiveTTL;
1991         }
1992
1993         /**
1994          * Use enableClientCache(false) to force it to send nocache headers
1995          *
1996          * @param bool $state
1997          *
1998          * @return bool
1999          */
2000         public function enableClientCache( $state ) {
2001                 return wfSetVar( $this->mEnableClientCache, $state );
2002         }
2003
2004         /**
2005          * Get the list of cookies that will influence on the cache
2006          *
2007          * @return array
2008          */
2009         function getCacheVaryCookies() {
2010                 static $cookies;
2011                 if ( $cookies === null ) {
2012                         $config = $this->getConfig();
2013                         $cookies = array_merge(
2014                                 SessionManager::singleton()->getVaryCookies(),
2015                                 [
2016                                         'forceHTTPS',
2017                                 ],
2018                                 $config->get( 'CacheVaryCookies' )
2019                         );
2020                         Hooks::run( 'GetCacheVaryCookies', [ $this, &$cookies ] );
2021                 }
2022                 return $cookies;
2023         }
2024
2025         /**
2026          * Check if the request has a cache-varying cookie header
2027          * If it does, it's very important that we don't allow public caching
2028          *
2029          * @return bool
2030          */
2031         function haveCacheVaryCookies() {
2032                 $request = $this->getRequest();
2033                 foreach ( $this->getCacheVaryCookies() as $cookieName ) {
2034                         if ( $request->getCookie( $cookieName, '', '' ) !== '' ) {
2035                                 wfDebug( __METHOD__ . ": found $cookieName\n" );
2036                                 return true;
2037                         }
2038                 }
2039                 wfDebug( __METHOD__ . ": no cache-varying cookies found\n" );
2040                 return false;
2041         }
2042
2043         /**
2044          * Add an HTTP header that will influence on the cache
2045          *
2046          * @param string $header Header name
2047          * @param string[]|null $option Options for the Key header. See
2048          * https://datatracker.ietf.org/doc/draft-fielding-http-key/
2049          * for the list of valid options.
2050          */
2051         public function addVaryHeader( $header, array $option = null ) {
2052                 if ( !array_key_exists( $header, $this->mVaryHeader ) ) {
2053                         $this->mVaryHeader[$header] = [];
2054                 }
2055                 if ( !is_array( $option ) ) {
2056                         $option = [];
2057                 }
2058                 $this->mVaryHeader[$header] = array_unique( array_merge( $this->mVaryHeader[$header], $option ) );
2059         }
2060
2061         /**
2062          * Return a Vary: header on which to vary caches. Based on the keys of $mVaryHeader,
2063          * such as Accept-Encoding or Cookie
2064          *
2065          * @return string
2066          */
2067         public function getVaryHeader() {
2068                 // If we vary on cookies, let's make sure it's always included here too.
2069                 if ( $this->getCacheVaryCookies() ) {
2070                         $this->addVaryHeader( 'Cookie' );
2071                 }
2072
2073                 foreach ( SessionManager::singleton()->getVaryHeaders() as $header => $options ) {
2074                         $this->addVaryHeader( $header, $options );
2075                 }
2076                 return 'Vary: ' . implode( ', ', array_keys( $this->mVaryHeader ) );
2077         }
2078
2079         /**
2080          * Get a complete Key header
2081          *
2082          * @return string
2083          */
2084         public function getKeyHeader() {
2085                 $cvCookies = $this->getCacheVaryCookies();
2086
2087                 $cookiesOption = [];
2088                 foreach ( $cvCookies as $cookieName ) {
2089                         $cookiesOption[] = 'param=' . $cookieName;
2090                 }
2091                 $this->addVaryHeader( 'Cookie', $cookiesOption );
2092
2093                 foreach ( SessionManager::singleton()->getVaryHeaders() as $header => $options ) {
2094                         $this->addVaryHeader( $header, $options );
2095                 }
2096
2097                 $headers = [];
2098                 foreach ( $this->mVaryHeader as $header => $option ) {
2099                         $newheader = $header;
2100                         if ( is_array( $option ) && count( $option ) > 0 ) {
2101                                 $newheader .= ';' . implode( ';', $option );
2102                         }
2103                         $headers[] = $newheader;
2104                 }
2105                 $key = 'Key: ' . implode( ',', $headers );
2106
2107                 return $key;
2108         }
2109
2110         /**
2111          * T23672: Add Accept-Language to Vary and Key headers
2112          * if there's no 'variant' parameter existed in GET.
2113          *
2114          * For example:
2115          *   /w/index.php?title=Main_page should always be served; but
2116          *   /w/index.php?title=Main_page&variant=zh-cn should never be served.
2117          */
2118         function addAcceptLanguage() {
2119                 $title = $this->getTitle();
2120                 if ( !$title instanceof Title ) {
2121                         return;
2122                 }
2123
2124                 $lang = $title->getPageLanguage();
2125                 if ( !$this->getRequest()->getCheck( 'variant' ) && $lang->hasVariants() ) {
2126                         $variants = $lang->getVariants();
2127                         $aloption = [];
2128                         foreach ( $variants as $variant ) {
2129                                 if ( $variant === $lang->getCode() ) {
2130                                         continue;
2131                                 } else {
2132                                         $aloption[] = 'substr=' . $variant;
2133
2134                                         // IE and some other browsers use BCP 47 standards in
2135                                         // their Accept-Language header, like "zh-CN" or "zh-Hant".
2136                                         // We should handle these too.
2137                                         $variantBCP47 = wfBCP47( $variant );
2138                                         if ( $variantBCP47 !== $variant ) {
2139                                                 $aloption[] = 'substr=' . $variantBCP47;
2140                                         }
2141                                 }
2142                         }
2143                         $this->addVaryHeader( 'Accept-Language', $aloption );
2144                 }
2145         }
2146
2147         /**
2148          * Set a flag which will cause an X-Frame-Options header appropriate for
2149          * edit pages to be sent. The header value is controlled by
2150          * $wgEditPageFrameOptions.
2151          *
2152          * This is the default for special pages. If you display a CSRF-protected
2153          * form on an ordinary view page, then you need to call this function.
2154          *
2155          * @param bool $enable
2156          */
2157         public function preventClickjacking( $enable = true ) {
2158                 $this->mPreventClickjacking = $enable;
2159         }
2160
2161         /**
2162          * Turn off frame-breaking. Alias for $this->preventClickjacking(false).
2163          * This can be called from pages which do not contain any CSRF-protected
2164          * HTML form.
2165          */
2166         public function allowClickjacking() {
2167                 $this->mPreventClickjacking = false;
2168         }
2169
2170         /**
2171          * Get the prevent-clickjacking flag
2172          *
2173          * @since 1.24
2174          * @return bool
2175          */
2176         public function getPreventClickjacking() {
2177                 return $this->mPreventClickjacking;
2178         }
2179
2180         /**
2181          * Get the X-Frame-Options header value (without the name part), or false
2182          * if there isn't one. This is used by Skin to determine whether to enable
2183          * JavaScript frame-breaking, for clients that don't support X-Frame-Options.
2184          *
2185          * @return string|false
2186          */
2187         public function getFrameOptions() {
2188                 $config = $this->getConfig();
2189                 if ( $config->get( 'BreakFrames' ) ) {
2190                         return 'DENY';
2191                 } elseif ( $this->mPreventClickjacking && $config->get( 'EditPageFrameOptions' ) ) {
2192                         return $config->get( 'EditPageFrameOptions' );
2193                 }
2194                 return false;
2195         }
2196
2197         /**
2198          * Send cache control HTTP headers
2199          */
2200         public function sendCacheControl() {
2201                 $response = $this->getRequest()->response();
2202                 $config = $this->getConfig();
2203
2204                 $this->addVaryHeader( 'Cookie' );
2205                 $this->addAcceptLanguage();
2206
2207                 # don't serve compressed data to clients who can't handle it
2208                 # maintain different caches for logged-in users and non-logged in ones
2209                 $response->header( $this->getVaryHeader() );
2210
2211                 if ( $config->get( 'UseKeyHeader' ) ) {
2212                         $response->header( $this->getKeyHeader() );
2213                 }
2214
2215                 if ( $this->mEnableClientCache ) {
2216                         if (
2217                                 $config->get( 'UseSquid' ) &&
2218                                 !$response->hasCookies() &&
2219                                 !SessionManager::getGlobalSession()->isPersistent() &&
2220                                 !$this->isPrintable() &&
2221                                 $this->mCdnMaxage != 0 &&
2222                                 !$this->haveCacheVaryCookies()
2223                         ) {
2224                                 if ( $config->get( 'UseESI' ) ) {
2225                                         # We'll purge the proxy cache explicitly, but require end user agents
2226                                         # to revalidate against the proxy on each visit.
2227                                         # Surrogate-Control controls our CDN, Cache-Control downstream caches
2228                                         wfDebug( __METHOD__ .
2229                                                 ": proxy caching with ESI; {$this->mLastModified} **", 'private' );
2230                                         # start with a shorter timeout for initial testing
2231                                         # header( 'Surrogate-Control: max-age=2678400+2678400, content="ESI/1.0"');
2232                                         $response->header(
2233                                                 "Surrogate-Control: max-age={$config->get( 'SquidMaxage' )}" .
2234                                                 "+{$this->mCdnMaxage}, content=\"ESI/1.0\""
2235                                         );
2236                                         $response->header( 'Cache-Control: s-maxage=0, must-revalidate, max-age=0' );
2237                                 } else {
2238                                         # We'll purge the proxy cache for anons explicitly, but require end user agents
2239                                         # to revalidate against the proxy on each visit.
2240                                         # IMPORTANT! The CDN needs to replace the Cache-Control header with
2241                                         # Cache-Control: s-maxage=0, must-revalidate, max-age=0
2242                                         wfDebug( __METHOD__ .
2243                                                 ": local proxy caching; {$this->mLastModified} **", 'private' );
2244                                         # start with a shorter timeout for initial testing
2245                                         # header( "Cache-Control: s-maxage=2678400, must-revalidate, max-age=0" );
2246                                         $response->header( "Cache-Control: " .
2247                                                 "s-maxage={$this->mCdnMaxage}, must-revalidate, max-age=0" );
2248                                 }
2249                         } else {
2250                                 # We do want clients to cache if they can, but they *must* check for updates
2251                                 # on revisiting the page.
2252                                 wfDebug( __METHOD__ . ": private caching; {$this->mLastModified} **", 'private' );
2253                                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
2254                                 $response->header( "Cache-Control: private, must-revalidate, max-age=0" );
2255                         }
2256                         if ( $this->mLastModified ) {
2257                                 $response->header( "Last-Modified: {$this->mLastModified}" );
2258                         }
2259                 } else {
2260                         wfDebug( __METHOD__ . ": no caching **", 'private' );
2261
2262                         # In general, the absence of a last modified header should be enough to prevent
2263                         # the client from using its cache. We send a few other things just to make sure.
2264                         $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
2265                         $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
2266                         $response->header( 'Pragma: no-cache' );
2267                 }
2268         }
2269
2270         /**
2271          * Finally, all the text has been munged and accumulated into
2272          * the object, let's actually output it:
2273          *
2274          * @param bool $return Set to true to get the result as a string rather than sending it
2275          * @return string|null
2276          * @throws Exception
2277          * @throws FatalError
2278          * @throws MWException
2279          */
2280         public function output( $return = false ) {
2281                 global $wgContLang;
2282
2283                 if ( $this->mDoNothing ) {
2284                         return $return ? '' : null;
2285                 }
2286
2287                 $response = $this->getRequest()->response();
2288                 $config = $this->getConfig();
2289
2290                 if ( $this->mRedirect != '' ) {
2291                         # Standards require redirect URLs to be absolute
2292                         $this->mRedirect = wfExpandUrl( $this->mRedirect, PROTO_CURRENT );
2293
2294                         $redirect = $this->mRedirect;
2295                         $code = $this->mRedirectCode;
2296
2297                         if ( Hooks::run( "BeforePageRedirect", [ $this, &$redirect, &$code ] ) ) {
2298                                 if ( $code == '301' || $code == '303' ) {
2299                                         if ( !$config->get( 'DebugRedirects' ) ) {
2300                                                 $response->statusHeader( $code );
2301                                         }
2302                                         $this->mLastModified = wfTimestamp( TS_RFC2822 );
2303                                 }
2304                                 if ( $config->get( 'VaryOnXFP' ) ) {
2305                                         $this->addVaryHeader( 'X-Forwarded-Proto' );
2306                                 }
2307                                 $this->sendCacheControl();
2308
2309                                 $response->header( "Content-Type: text/html; charset=utf-8" );
2310                                 if ( $config->get( 'DebugRedirects' ) ) {
2311                                         $url = htmlspecialchars( $redirect );
2312                                         print "<!DOCTYPE html>\n<html>\n<head>\n<title>Redirect</title>\n</head>\n<body>\n";
2313                                         print "<p>Location: <a href=\"$url\">$url</a></p>\n";
2314                                         print "</body>\n</html>\n";
2315                                 } else {
2316                                         $response->header( 'Location: ' . $redirect );
2317                                 }
2318                         }
2319
2320                         return $return ? '' : null;
2321                 } elseif ( $this->mStatusCode ) {
2322                         $response->statusHeader( $this->mStatusCode );
2323                 }
2324
2325                 # Buffer output; final headers may depend on later processing
2326                 ob_start();
2327
2328                 $response->header( 'Content-type: ' . $config->get( 'MimeType' ) . '; charset=UTF-8' );
2329                 $response->header( 'Content-language: ' . $wgContLang->getHtmlCode() );
2330
2331                 // Avoid Internet Explorer "compatibility view" in IE 8-10, so that
2332                 // jQuery etc. can work correctly.
2333                 $response->header( 'X-UA-Compatible: IE=Edge' );
2334
2335                 // Prevent framing, if requested
2336                 $frameOptions = $this->getFrameOptions();
2337                 if ( $frameOptions ) {
2338                         $response->header( "X-Frame-Options: $frameOptions" );
2339                 }
2340
2341                 if ( $this->mArticleBodyOnly ) {
2342                         echo $this->mBodytext;
2343                 } else {
2344                         $sk = $this->getSkin();
2345                         // add skin specific modules
2346                         $modules = $sk->getDefaultModules();
2347
2348                         // Enforce various default modules for all pages and all skins
2349                         $coreModules = [
2350                                 // Keep this list as small as possible
2351                                 'site',
2352                                 'mediawiki.page.startup',
2353                                 'mediawiki.user',
2354                         ];
2355
2356                         // Support for high-density display images if enabled
2357                         if ( $config->get( 'ResponsiveImages' ) ) {
2358                                 $coreModules[] = 'mediawiki.hidpi';
2359                         }
2360
2361                         $this->addModules( $coreModules );
2362                         foreach ( $modules as $group ) {
2363                                 $this->addModules( $group );
2364                         }
2365                         MWDebug::addModules( $this );
2366
2367                         // Avoid PHP 7.1 warning of passing $this by reference
2368                         $outputPage = $this;
2369                         // Hook that allows last minute changes to the output page, e.g.
2370                         // adding of CSS or Javascript by extensions.
2371                         Hooks::run( 'BeforePageDisplay', [ &$outputPage, &$sk ] );
2372
2373                         try {
2374                                 $sk->outputPage();
2375                         } catch ( Exception $e ) {
2376                                 ob_end_clean(); // bug T129657
2377                                 throw $e;
2378                         }
2379                 }
2380
2381                 try {
2382                         // This hook allows last minute changes to final overall output by modifying output buffer
2383                         Hooks::run( 'AfterFinalPageOutput', [ $this ] );
2384                 } catch ( Exception $e ) {
2385                         ob_end_clean(); // bug T129657
2386                         throw $e;
2387                 }
2388
2389                 $this->sendCacheControl();
2390
2391                 if ( $return ) {
2392                         return ob_get_clean();
2393                 } else {
2394                         ob_end_flush();
2395                         return null;
2396                 }
2397         }
2398
2399         /**
2400          * Prepare this object to display an error page; disable caching and
2401          * indexing, clear the current text and redirect, set the page's title
2402          * and optionally an custom HTML title (content of the "<title>" tag).
2403          *
2404          * @param string|Message $pageTitle Will be passed directly to setPageTitle()
2405          * @param string|Message $htmlTitle Will be passed directly to setHTMLTitle();
2406          *                   optional, if not passed the "<title>" attribute will be
2407          *                   based on $pageTitle
2408          */
2409         public function prepareErrorPage( $pageTitle, $htmlTitle = false ) {
2410                 $this->setPageTitle( $pageTitle );
2411                 if ( $htmlTitle !== false ) {
2412                         $this->setHTMLTitle( $htmlTitle );
2413                 }
2414                 $this->setRobotPolicy( 'noindex,nofollow' );
2415                 $this->setArticleRelated( false );
2416                 $this->enableClientCache( false );
2417                 $this->mRedirect = '';
2418                 $this->clearSubtitle();
2419                 $this->clearHTML();
2420         }
2421
2422         /**
2423          * Output a standard error page
2424          *
2425          * showErrorPage( 'titlemsg', 'pagetextmsg' );
2426          * showErrorPage( 'titlemsg', 'pagetextmsg', [ 'param1', 'param2' ] );
2427          * showErrorPage( 'titlemsg', $messageObject );
2428          * showErrorPage( $titleMessageObject, $messageObject );
2429          *
2430          * @param string|Message $title Message key (string) for page title, or a Message object
2431          * @param string|Message $msg Message key (string) for page text, or a Message object
2432          * @param array $params Message parameters; ignored if $msg is a Message object
2433          */
2434         public function showErrorPage( $title, $msg, $params = [] ) {
2435                 if ( !$title instanceof Message ) {
2436                         $title = $this->msg( $title );
2437                 }
2438
2439                 $this->prepareErrorPage( $title );
2440
2441                 if ( $msg instanceof Message ) {
2442                         if ( $params !== [] ) {
2443                                 trigger_error( 'Argument ignored: $params. The message parameters argument '
2444                                         . 'is discarded when the $msg argument is a Message object instead of '
2445                                         . 'a string.', E_USER_NOTICE );
2446                         }
2447                         $this->addHTML( $msg->parseAsBlock() );
2448                 } else {
2449                         $this->addWikiMsgArray( $msg, $params );
2450                 }
2451
2452                 $this->returnToMain();
2453         }
2454
2455         /**
2456          * Output a standard permission error page
2457          *
2458          * @param array $errors Error message keys or [key, param...] arrays
2459          * @param string $action Action that was denied or null if unknown
2460          */
2461         public function showPermissionsErrorPage( array $errors, $action = null ) {
2462                 foreach ( $errors as $key => $error ) {
2463                         $errors[$key] = (array)$error;
2464                 }
2465
2466                 // For some action (read, edit, create and upload), display a "login to do this action"
2467                 // error if all of the following conditions are met:
2468                 // 1. the user is not logged in
2469                 // 2. the only error is insufficient permissions (i.e. no block or something else)
2470                 // 3. the error can be avoided simply by logging in
2471                 if ( in_array( $action, [ 'read', 'edit', 'createpage', 'createtalk', 'upload' ] )
2472                         && $this->getUser()->isAnon() && count( $errors ) == 1 && isset( $errors[0][0] )
2473                         && ( $errors[0][0] == 'badaccess-groups' || $errors[0][0] == 'badaccess-group0' )
2474                         && ( User::groupHasPermission( 'user', $action )
2475                         || User::groupHasPermission( 'autoconfirmed', $action ) )
2476                 ) {
2477                         $displayReturnto = null;
2478
2479                         # Due to bug 32276, if a user does not have read permissions,
2480                         # $this->getTitle() will just give Special:Badtitle, which is
2481                         # not especially useful as a returnto parameter. Use the title
2482                         # from the request instead, if there was one.
2483                         $request = $this->getRequest();
2484                         $returnto = Title::newFromText( $request->getVal( 'title', '' ) );
2485                         if ( $action == 'edit' ) {
2486                                 $msg = 'whitelistedittext';
2487                                 $displayReturnto = $returnto;
2488                         } elseif ( $action == 'createpage' || $action == 'createtalk' ) {
2489                                 $msg = 'nocreatetext';
2490                         } elseif ( $action == 'upload' ) {
2491                                 $msg = 'uploadnologintext';
2492                         } else { # Read
2493                                 $msg = 'loginreqpagetext';
2494                                 $displayReturnto = Title::newMainPage();
2495                         }
2496
2497                         $query = [];
2498
2499                         if ( $returnto ) {
2500                                 $query['returnto'] = $returnto->getPrefixedText();
2501
2502                                 if ( !$request->wasPosted() ) {
2503                                         $returntoquery = $request->getValues();
2504                                         unset( $returntoquery['title'] );
2505                                         unset( $returntoquery['returnto'] );
2506                                         unset( $returntoquery['returntoquery'] );
2507                                         $query['returntoquery'] = wfArrayToCgi( $returntoquery );
2508                                 }
2509                         }
2510                         $loginLink = Linker::linkKnown(
2511                                 SpecialPage::getTitleFor( 'Userlogin' ),
2512                                 $this->msg( 'loginreqlink' )->escaped(),
2513                                 [],
2514                                 $query
2515                         );
2516
2517                         $this->prepareErrorPage( $this->msg( 'loginreqtitle' ) );
2518                         $this->addHTML( $this->msg( $msg )->rawParams( $loginLink )->parse() );
2519
2520                         # Don't return to a page the user can't read otherwise
2521                         # we'll end up in a pointless loop
2522                         if ( $displayReturnto && $displayReturnto->userCan( 'read', $this->getUser() ) ) {
2523                                 $this->returnToMain( null, $displayReturnto );
2524                         }
2525                 } else {
2526                         $this->prepareErrorPage( $this->msg( 'permissionserrors' ) );
2527                         $this->addWikiText( $this->formatPermissionsErrorMessage( $errors, $action ) );
2528                 }
2529         }
2530
2531         /**
2532          * Display an error page indicating that a given version of MediaWiki is
2533          * required to use it
2534          *
2535          * @param mixed $version The version of MediaWiki needed to use the page
2536          */
2537         public function versionRequired( $version ) {
2538                 $this->prepareErrorPage( $this->msg( 'versionrequired', $version ) );
2539
2540                 $this->addWikiMsg( 'versionrequiredtext', $version );
2541                 $this->returnToMain();
2542         }
2543
2544         /**
2545          * Format a list of error messages
2546          *
2547          * @param array $errors Array of arrays returned by Title::getUserPermissionsErrors
2548          * @param string $action Action that was denied or null if unknown
2549          * @return string The wikitext error-messages, formatted into a list.
2550          */
2551         public function formatPermissionsErrorMessage( array $errors, $action = null ) {
2552                 if ( $action == null ) {
2553                         $text = $this->msg( 'permissionserrorstext', count( $errors ) )->plain() . "\n\n";
2554                 } else {
2555                         $action_desc = $this->msg( "action-$action" )->plain();
2556                         $text = $this->msg(
2557                                 'permissionserrorstext-withaction',
2558                                 count( $errors ),
2559                                 $action_desc
2560                         )->plain() . "\n\n";
2561                 }
2562
2563                 if ( count( $errors ) > 1 ) {
2564                         $text .= '<ul class="permissions-errors">' . "\n";
2565
2566                         foreach ( $errors as $error ) {
2567                                 $text .= '<li>';
2568                                 $text .= call_user_func_array( [ $this, 'msg' ], $error )->plain();
2569                                 $text .= "</li>\n";
2570                         }
2571                         $text .= '</ul>';
2572                 } else {
2573                         $text .= "<div class=\"permissions-errors\">\n" .
2574                                         call_user_func_array( [ $this, 'msg' ], reset( $errors ) )->plain() .
2575                                         "\n</div>";
2576                 }
2577
2578                 return $text;
2579         }
2580
2581         /**
2582          * Display a page stating that the Wiki is in read-only mode.
2583          * Should only be called after wfReadOnly() has returned true.
2584          *
2585          * Historically, this function was used to show the source of the page that the user
2586          * was trying to edit and _also_ permissions error messages. The relevant code was
2587          * moved into EditPage in 1.19 (r102024 / d83c2a431c2a) and removed here in 1.25.
2588          *
2589          * @deprecated since 1.25; throw the exception directly
2590          * @throws ReadOnlyError
2591          */
2592         public function readOnlyPage() {
2593                 if ( func_num_args() > 0 ) {
2594                         throw new MWException( __METHOD__ . ' no longer accepts arguments since 1.25.' );
2595                 }
2596
2597                 throw new ReadOnlyError;
2598         }
2599
2600         /**
2601          * Turn off regular page output and return an error response
2602          * for when rate limiting has triggered.
2603          *
2604          * @deprecated since 1.25; throw the exception directly
2605          */
2606         public function rateLimited() {
2607                 wfDeprecated( __METHOD__, '1.25' );
2608                 throw new ThrottledError;
2609         }
2610
2611         /**
2612          * Show a warning about replica DB lag
2613          *
2614          * If the lag is higher than $wgSlaveLagCritical seconds,
2615          * then the warning is a bit more obvious. If the lag is
2616          * lower than $wgSlaveLagWarning, then no warning is shown.
2617          *
2618          * @param int $lag Slave lag
2619          */
2620         public function showLagWarning( $lag ) {
2621                 $config = $this->getConfig();
2622                 if ( $lag >= $config->get( 'SlaveLagWarning' ) ) {
2623                         $lag = floor( $lag ); // floor to avoid nano seconds to display
2624                         $message = $lag < $config->get( 'SlaveLagCritical' )
2625                                 ? 'lag-warn-normal'
2626                                 : 'lag-warn-high';
2627                         $wrap = Html::rawElement( 'div', [ 'class' => "mw-{$message}" ], "\n$1\n" );
2628                         $this->wrapWikiMsg( "$wrap\n", [ $message, $this->getLanguage()->formatNum( $lag ) ] );
2629                 }
2630         }
2631
2632         public function showFatalError( $message ) {
2633                 $this->prepareErrorPage( $this->msg( 'internalerror' ) );
2634
2635                 $this->addHTML( $message );
2636         }
2637
2638         public function showUnexpectedValueError( $name, $val ) {
2639                 $this->showFatalError( $this->msg( 'unexpected', $name, $val )->text() );
2640         }
2641
2642         public function showFileCopyError( $old, $new ) {
2643                 $this->showFatalError( $this->msg( 'filecopyerror', $old, $new )->text() );
2644         }
2645
2646         public function showFileRenameError( $old, $new ) {
2647                 $this->showFatalError( $this->msg( 'filerenameerror', $old, $new )->text() );
2648         }
2649
2650         public function showFileDeleteError( $name ) {
2651                 $this->showFatalError( $this->msg( 'filedeleteerror', $name )->text() );
2652         }
2653
2654         public function showFileNotFoundError( $name ) {
2655                 $this->showFatalError( $this->msg( 'filenotfound', $name )->text() );
2656         }
2657
2658         /**
2659          * Add a "return to" link pointing to a specified title
2660          *
2661          * @param Title $title Title to link
2662          * @param array $query Query string parameters
2663          * @param string $text Text of the link (input is not escaped)
2664          * @param array $options Options array to pass to Linker
2665          */
2666         public function addReturnTo( $title, array $query = [], $text = null, $options = [] ) {
2667                 $linkRenderer = MediaWikiServices::getInstance()
2668                         ->getLinkRendererFactory()->createFromLegacyOptions( $options );
2669                 $link = $this->msg( 'returnto' )->rawParams(
2670                         $linkRenderer->makeLink( $title, $text, [], $query ) )->escaped();
2671                 $this->addHTML( "<p id=\"mw-returnto\">{$link}</p>\n" );
2672         }
2673
2674         /**
2675          * Add a "return to" link pointing to a specified title,
2676          * or the title indicated in the request, or else the main page
2677          *
2678          * @param mixed $unused
2679          * @param Title|string $returnto Title or String to return to
2680          * @param string $returntoquery Query string for the return to link
2681          */
2682         public function returnToMain( $unused = null, $returnto = null, $returntoquery = null ) {
2683                 if ( $returnto == null ) {
2684                         $returnto = $this->getRequest()->getText( 'returnto' );
2685                 }
2686
2687                 if ( $returntoquery == null ) {
2688                         $returntoquery = $this->getRequest()->getText( 'returntoquery' );
2689                 }
2690
2691                 if ( $returnto === '' ) {
2692                         $returnto = Title::newMainPage();
2693                 }
2694
2695                 if ( is_object( $returnto ) ) {
2696                         $titleObj = $returnto;
2697                 } else {
2698                         $titleObj = Title::newFromText( $returnto );
2699                 }
2700                 if ( !is_object( $titleObj ) ) {
2701                         $titleObj = Title::newMainPage();
2702                 }
2703
2704                 $this->addReturnTo( $titleObj, wfCgiToArray( $returntoquery ) );
2705         }
2706
2707         private function getRlClientContext() {
2708                 if ( !$this->rlClientContext ) {
2709                         $query = ResourceLoader::makeLoaderQuery(
2710                                 [], // modules; not relevant
2711                                 $this->getLanguage()->getCode(),
2712                                 $this->getSkin()->getSkinName(),
2713                                 $this->getUser()->isLoggedIn() ? $this->getUser()->getName() : null,
2714                                 null, // version; not relevant
2715                                 ResourceLoader::inDebugMode(),
2716                                 null, // only; not relevant
2717                                 $this->isPrintable(),
2718                                 $this->getRequest()->getBool( 'handheld' )
2719                         );
2720                         $this->rlClientContext = new ResourceLoaderContext(
2721                                 $this->getResourceLoader(),
2722                                 new FauxRequest( $query )
2723                         );
2724                 }
2725                 return $this->rlClientContext;
2726         }
2727
2728         /**
2729          * Call this to freeze the module queue and JS config and create a formatter.
2730          *
2731          * Depending on the Skin, this may get lazy-initialised in either headElement() or
2732          * getBottomScripts(). See SkinTemplate::prepareQuickTemplate(). Calling this too early may
2733          * cause unexpected side-effects since disallowUserJs() may be called at any time to change
2734          * the module filters retroactively. Skins and extension hooks may also add modules until very
2735          * late in the request lifecycle.
2736          *
2737          * @return ResourceLoaderClientHtml
2738          */
2739         public function getRlClient() {
2740                 if ( !$this->rlClient ) {
2741                         $context = $this->getRlClientContext();
2742                         $rl = $this->getResourceLoader();
2743                         $this->addModules( [
2744                                 'user.options',
2745                                 'user.tokens',
2746                         ] );
2747                         $this->addModuleStyles( [
2748                                 'site.styles',
2749                                 'noscript',
2750                                 'user.styles',
2751                         ] );
2752                         $this->getSkin()->setupSkinUserCss( $this );
2753
2754                         // Prepare exempt modules for buildExemptModules()
2755                         $exemptGroups = [ 'site' => [], 'noscript' => [], 'private' => [], 'user' => [] ];
2756                         $exemptStates = [];
2757                         $moduleStyles = $this->getModuleStyles( /*filter*/ true );
2758
2759                         // Preload getTitleInfo for isKnownEmpty calls below and in ResourceLoaderClientHtml
2760                         // Separate user-specific batch for improved cache-hit ratio.
2761                         $userBatch = [ 'user.styles', 'user' ];
2762                         $siteBatch = array_diff( $moduleStyles, $userBatch );
2763                         $dbr = wfGetDB( DB_REPLICA );
2764                         ResourceLoaderWikiModule::preloadTitleInfo( $context, $dbr, $siteBatch );
2765                         ResourceLoaderWikiModule::preloadTitleInfo( $context, $dbr, $userBatch );
2766
2767                         // Filter out modules handled by buildExemptModules()
2768                         $moduleStyles = array_filter( $moduleStyles,
2769                                 function ( $name ) use ( $rl, $context, &$exemptGroups, &$exemptStates ) {
2770                                         $module = $rl->getModule( $name );
2771                                         if ( $module ) {
2772                                                 if ( $name === 'user.styles' && $this->isUserCssPreview() ) {
2773                                                         $exemptStates[$name] = 'ready';
2774                                                         // Special case in buildExemptModules()
2775                                                         return false;
2776                                                 }
2777                                                 $group = $module->getGroup();
2778                                                 if ( isset( $exemptGroups[$group] ) ) {
2779                                                         $exemptStates[$name] = 'ready';
2780                                                         if ( !$module->isKnownEmpty( $context ) ) {
2781                                                                 // E.g. Don't output empty <styles>
2782                                                                 $exemptGroups[$group][] = $name;
2783                                                         }
2784                                                         return false;
2785                                                 }
2786                                         }
2787                                         return true;
2788                                 }
2789                         );
2790                         $this->rlExemptStyleModules = $exemptGroups;
2791
2792                         $isUserModuleFiltered = !$this->filterModules( [ 'user' ] );
2793                         // If this page filters out 'user', makeResourceLoaderLink will drop it.
2794                         // Avoid indefinite "loading" state or untrue "ready" state (T145368).
2795                         if ( !$isUserModuleFiltered ) {
2796                                 // Manually handled by getBottomScripts()
2797                                 $userModule = $rl->getModule( 'user' );
2798                                 $userState = $userModule->isKnownEmpty( $context ) && !$this->isUserJsPreview()
2799                                         ? 'ready'
2800                                         : 'loading';
2801                                 $this->rlUserModuleState = $exemptStates['user'] = $userState;
2802                         }
2803
2804                         $rlClient = new ResourceLoaderClientHtml( $context, $this->getTarget() );
2805                         $rlClient->setConfig( $this->getJSVars() );
2806                         $rlClient->setModules( $this->getModules( /*filter*/ true ) );
2807                         $rlClient->setModuleStyles( $moduleStyles );
2808                         $rlClient->setModuleScripts( $this->getModuleScripts( /*filter*/ true ) );
2809                         $rlClient->setExemptStates( $exemptStates );
2810                         $this->rlClient = $rlClient;
2811                 }
2812                 return $this->rlClient;
2813         }
2814
2815         /**
2816          * @param Skin $sk The given Skin
2817          * @param bool $includeStyle Unused
2818          * @return string The doctype, opening "<html>", and head element.
2819          */
2820         public function headElement( Skin $sk, $includeStyle = true ) {
2821                 global $wgContLang;
2822
2823                 $userdir = $this->getLanguage()->getDir();
2824                 $sitedir = $wgContLang->getDir();
2825
2826                 $pieces = [];
2827                 $pieces[] = Html::htmlHeader( Sanitizer::mergeAttributes(
2828                         $this->getRlClient()->getDocumentAttributes(),
2829                         $sk->getHtmlElementAttributes()
2830                 ) );
2831                 $pieces[] = Html::openElement( 'head' );
2832
2833                 if ( $this->getHTMLTitle() == '' ) {
2834                         $this->setHTMLTitle( $this->msg( 'pagetitle', $this->getPageTitle() )->inContentLanguage() );
2835                 }
2836
2837                 if ( !Html::isXmlMimeType( $this->getConfig()->get( 'MimeType' ) ) ) {
2838                         // Add <meta charset="UTF-8">
2839                         // This should be before <title> since it defines the charset used by
2840                         // text including the text inside <title>.
2841                         // The spec recommends defining XHTML5's charset using the XML declaration
2842                         // instead of meta.
2843                         // Our XML declaration is output by Html::htmlHeader.
2844                         // https://html.spec.whatwg.org/multipage/semantics.html#attr-meta-http-equiv-content-type
2845                         // https://html.spec.whatwg.org/multipage/semantics.html#charset
2846                         $pieces[] = Html::element( 'meta', [ 'charset' => 'UTF-8' ] );
2847                 }
2848
2849                 $pieces[] = Html::element( 'title', null, $this->getHTMLTitle() );
2850                 $pieces[] = $this->getRlClient()->getHeadHtml();
2851                 $pieces[] = $this->buildExemptModules();
2852                 $pieces = array_merge( $pieces, array_values( $this->getHeadLinksArray() ) );
2853                 $pieces = array_merge( $pieces, array_values( $this->mHeadItems ) );
2854                 $pieces[] = Html::closeElement( 'head' );
2855
2856                 $bodyClasses = [];
2857                 $bodyClasses[] = 'mediawiki';
2858
2859                 # Classes for LTR/RTL directionality support
2860                 $bodyClasses[] = $userdir;
2861                 $bodyClasses[] = "sitedir-$sitedir";
2862
2863                 $underline = $this->getUser()->getOption( 'underline' );
2864                 if ( $underline < 2 ) {
2865                         // The following classes can be used here:
2866                         // * mw-underline-always
2867                         // * mw-underline-never
2868                         $bodyClasses[] = 'mw-underline-' . ( $underline ? 'always' : 'never' );
2869                 }
2870
2871                 if ( $this->getLanguage()->capitalizeAllNouns() ) {
2872                         # A <body> class is probably not the best way to do this . . .
2873                         $bodyClasses[] = 'capitalize-all-nouns';
2874                 }
2875
2876                 // Parser feature migration class
2877                 // The idea is that this will eventually be removed, after the wikitext
2878                 // which requires it is cleaned up.
2879                 $bodyClasses[] = 'mw-hide-empty-elt';
2880
2881                 $bodyClasses[] = $sk->getPageClasses( $this->getTitle() );
2882                 $bodyClasses[] = 'skin-' . Sanitizer::escapeClass( $sk->getSkinName() );
2883                 $bodyClasses[] =
2884                         'action-' . Sanitizer::escapeClass( Action::getActionName( $this->getContext() ) );
2885
2886                 $bodyAttrs = [];
2887                 // While the implode() is not strictly needed, it's used for backwards compatibility
2888                 // (this used to be built as a string and hooks likely still expect that).
2889                 $bodyAttrs['class'] = implode( ' ', $bodyClasses );
2890
2891                 // Allow skins and extensions to add body attributes they need
2892                 $sk->addToBodyAttributes( $this, $bodyAttrs );
2893                 Hooks::run( 'OutputPageBodyAttributes', [ $this, $sk, &$bodyAttrs ] );
2894
2895                 $pieces[] = Html::openElement( 'body', $bodyAttrs );
2896
2897                 return self::combineWrappedStrings( $pieces );
2898         }
2899
2900         /**
2901          * Get a ResourceLoader object associated with this OutputPage
2902          *
2903          * @return ResourceLoader
2904          */
2905         public function getResourceLoader() {
2906                 if ( is_null( $this->mResourceLoader ) ) {
2907                         $this->mResourceLoader = new ResourceLoader(
2908                                 $this->getConfig(),
2909                                 LoggerFactory::getInstance( 'resourceloader' )
2910                         );
2911                 }
2912                 return $this->mResourceLoader;
2913         }
2914
2915         /**
2916          * Explicily load or embed modules on a page.
2917          *
2918          * @param array|string $modules One or more module names
2919          * @param string $only ResourceLoaderModule TYPE_ class constant
2920          * @param array $extraQuery [optional] Array with extra query parameters for the request
2921          * @return string|WrappedStringList HTML
2922          */
2923         public function makeResourceLoaderLink( $modules, $only, array $extraQuery = [] ) {
2924                 // Apply 'target' and 'origin' filters
2925                 $modules = $this->filterModules( (array)$modules, null, $only );
2926
2927                 return ResourceLoaderClientHtml::makeLoad(
2928                         $this->getRlClientContext(),
2929                         $modules,
2930                         $only,
2931                         $extraQuery
2932                 );
2933         }
2934
2935         /**
2936          * Combine WrappedString chunks and filter out empty ones
2937          *
2938          * @param array $chunks
2939          * @return string|WrappedStringList HTML
2940          */
2941         protected static function combineWrappedStrings( array $chunks ) {
2942                 // Filter out empty values
2943                 $chunks = array_filter( $chunks, 'strlen' );
2944                 return WrappedString::join( "\n", $chunks );
2945         }
2946
2947         private function isUserJsPreview() {
2948                 return $this->getConfig()->get( 'AllowUserJs' )
2949                         && $this->getTitle()
2950                         && $this->getTitle()->isJsSubpage()
2951                         && $this->userCanPreview();
2952         }
2953
2954         private function isUserCssPreview() {
2955                 return $this->getConfig()->get( 'AllowUserCss' )
2956                         && $this->getTitle()
2957                         && $this->getTitle()->isCssSubpage()
2958                         && $this->userCanPreview();
2959         }
2960
2961         /**
2962          * JS stuff to put at the bottom of the `<body>`. These are modules with position 'bottom',
2963          * legacy scripts ($this->mScripts), and user JS.
2964          *
2965          * @return string|WrappedStringList HTML
2966          */
2967         public function getBottomScripts() {
2968                 $chunks = [];
2969                 $chunks[] = $this->getRlClient()->getBodyHtml();
2970
2971                 // Legacy non-ResourceLoader scripts
2972                 $chunks[] = $this->mScripts;
2973
2974                 // Exempt 'user' module
2975                 // - May need excludepages for live preview. (T28283)
2976                 // - Must use TYPE_COMBINED so its response is handled by mw.loader.implement() which
2977                 //   ensures execution is scheduled after the "site" module.
2978                 // - Don't load if module state is already resolved as "ready".
2979                 if ( $this->rlUserModuleState === 'loading' ) {
2980                         if ( $this->isUserJsPreview() ) {
2981                                 $chunks[] = $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_COMBINED,
2982                                         [ 'excludepage' => $this->getTitle()->getPrefixedDBkey() ]
2983                                 );
2984                                 $chunks[] = ResourceLoader::makeInlineScript(
2985                                         Xml::encodeJsCall( 'mw.loader.using', [
2986                                                 [ 'user', 'site' ],
2987                                                 new XmlJsCode(
2988                                                         'function () {'
2989                                                                 . Xml::encodeJsCall( '$.globalEval', [
2990                                                                         $this->getRequest()->getText( 'wpTextbox1' )
2991                                                                 ] )
2992                                                                 . '}'
2993                                                 )
2994                                         ] )
2995                                 );
2996                                 // FIXME: If the user is previewing, say, ./vector.js, his ./common.js will be loaded
2997                                 // asynchronously and may arrive *after* the inline script here. So the previewed code
2998                                 // may execute before ./common.js runs. Normally, ./common.js runs before ./vector.js.
2999                                 // Similarly, when previewing ./common.js and the user module does arrive first,
3000                                 // it will arrive without common.js and the inline script runs after.
3001                                 // Thus running common after the excluded subpage.
3002                         } else {
3003                                 // Load normally
3004                                 $chunks[] = $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_COMBINED );
3005                         }
3006                 }
3007
3008                 return self::combineWrappedStrings( $chunks );
3009         }
3010
3011         /**
3012          * Get the javascript config vars to include on this page
3013          *
3014          * @return array Array of javascript config vars
3015          * @since 1.23
3016          */
3017         public function getJsConfigVars() {
3018                 return $this->mJsConfigVars;
3019         }
3020
3021         /**
3022          * Add one or more variables to be set in mw.config in JavaScript
3023          *
3024          * @param string|array $keys Key or array of key/value pairs
3025          * @param mixed $value [optional] Value of the configuration variable
3026          */
3027         public function addJsConfigVars( $keys, $value = null ) {
3028                 if ( is_array( $keys ) ) {
3029                         foreach ( $keys as $key => $value ) {
3030                                 $this->mJsConfigVars[$key] = $value;
3031                         }
3032                         return;
3033                 }
3034
3035                 $this->mJsConfigVars[$keys] = $value;
3036         }
3037
3038         /**
3039          * Get an array containing the variables to be set in mw.config in JavaScript.
3040          *
3041          * Do not add things here which can be evaluated in ResourceLoaderStartUpModule
3042          * - in other words, page-independent/site-wide variables (without state).
3043          * You will only be adding bloat to the html page and causing page caches to
3044          * have to be purged on configuration changes.
3045          * @return array
3046          */
3047         public function getJSVars() {
3048                 global $wgContLang;
3049
3050                 $curRevisionId = 0;
3051                 $articleId = 0;
3052                 $canonicalSpecialPageName = false; # bug 21115
3053
3054                 $title = $this->getTitle();
3055                 $ns = $title->getNamespace();
3056                 $canonicalNamespace = MWNamespace::exists( $ns )
3057                         ? MWNamespace::getCanonicalName( $ns )
3058                         : $title->getNsText();
3059
3060                 $sk = $this->getSkin();
3061                 // Get the relevant title so that AJAX features can use the correct page name
3062                 // when making API requests from certain special pages (bug 34972).
3063                 $relevantTitle = $sk->getRelevantTitle();
3064                 $relevantUser = $sk->getRelevantUser();
3065
3066                 if ( $ns == NS_SPECIAL ) {
3067                         list( $canonicalSpecialPageName, /*...*/ ) =
3068                                 SpecialPageFactory::resolveAlias( $title->getDBkey() );
3069                 } elseif ( $this->canUseWikiPage() ) {
3070                         $wikiPage = $this->getWikiPage();
3071                         $curRevisionId = $wikiPage->getLatest();
3072                         $articleId = $wikiPage->getId();
3073                 }
3074
3075                 $lang = $title->getPageViewLanguage();
3076
3077                 // Pre-process information
3078                 $separatorTransTable = $lang->separatorTransformTable();
3079                 $separatorTransTable = $separatorTransTable ? $separatorTransTable : [];
3080                 $compactSeparatorTransTable = [
3081                         implode( "\t", array_keys( $separatorTransTable ) ),
3082                         implode( "\t", $separatorTransTable ),
3083                 ];
3084                 $digitTransTable = $lang->digitTransformTable();
3085                 $digitTransTable = $digitTransTable ? $digitTransTable : [];
3086                 $compactDigitTransTable = [
3087                         implode( "\t", array_keys( $digitTransTable ) ),
3088                         implode( "\t", $digitTransTable ),
3089                 ];
3090
3091                 $user = $this->getUser();
3092
3093                 $vars = [
3094                         'wgCanonicalNamespace' => $canonicalNamespace,
3095                         'wgCanonicalSpecialPageName' => $canonicalSpecialPageName,
3096                         'wgNamespaceNumber' => $title->getNamespace(),
3097                         'wgPageName' => $title->getPrefixedDBkey(),
3098                         'wgTitle' => $title->getText(),
3099                         'wgCurRevisionId' => $curRevisionId,
3100                         'wgRevisionId' => (int)$this->getRevisionId(),
3101                         'wgArticleId' => $articleId,
3102                         'wgIsArticle' => $this->isArticle(),
3103                         'wgIsRedirect' => $title->isRedirect(),
3104                         'wgAction' => Action::getActionName( $this->getContext() ),
3105                         'wgUserName' => $user->isAnon() ? null : $user->getName(),
3106                         'wgUserGroups' => $user->getEffectiveGroups(),
3107                         'wgCategories' => $this->getCategories(),
3108                         'wgBreakFrames' => $this->getFrameOptions() == 'DENY',
3109                         'wgPageContentLanguage' => $lang->getCode(),
3110                         'wgPageContentModel' => $title->getContentModel(),
3111                         'wgSeparatorTransformTable' => $compactSeparatorTransTable,
3112                         'wgDigitTransformTable' => $compactDigitTransTable,
3113                         'wgDefaultDateFormat' => $lang->getDefaultDateFormat(),
3114                         'wgMonthNames' => $lang->getMonthNamesArray(),
3115                         'wgMonthNamesShort' => $lang->getMonthAbbreviationsArray(),
3116                         'wgRelevantPageName' => $relevantTitle->getPrefixedDBkey(),
3117                         'wgRelevantArticleId' => $relevantTitle->getArticleID(),
3118                         'wgRequestId' => WebRequest::getRequestId(),
3119                 ];
3120
3121                 if ( $user->isLoggedIn() ) {
3122                         $vars['wgUserId'] = $user->getId();
3123                         $vars['wgUserEditCount'] = $user->getEditCount();
3124                         $userReg = $user->getRegistration();
3125                         $vars['wgUserRegistration'] = $userReg ? wfTimestamp( TS_UNIX, $userReg ) * 1000 : null;
3126                         // Get the revision ID of the oldest new message on the user's talk
3127                         // page. This can be used for constructing new message alerts on
3128                         // the client side.
3129                         $vars['wgUserNewMsgRevisionId'] = $user->getNewMessageRevisionId();
3130                 }
3131
3132                 if ( $wgContLang->hasVariants() ) {
3133                         $vars['wgUserVariant'] = $wgContLang->getPreferredVariant();
3134                 }
3135                 // Same test as SkinTemplate
3136                 $vars['wgIsProbablyEditable'] = $title->quickUserCan( 'edit', $user )
3137                         && ( $title->exists() || $title->quickUserCan( 'create', $user ) );
3138
3139                 foreach ( $title->getRestrictionTypes() as $type ) {
3140                         $vars['wgRestriction' . ucfirst( $type )] = $title->getRestrictions( $type );
3141                 }
3142
3143                 if ( $title->isMainPage() ) {
3144                         $vars['wgIsMainPage'] = true;
3145                 }
3146
3147                 if ( $this->mRedirectedFrom ) {
3148                         $vars['wgRedirectedFrom'] = $this->mRedirectedFrom->getPrefixedDBkey();
3149                 }
3150
3151                 if ( $relevantUser ) {
3152                         $vars['wgRelevantUserName'] = $relevantUser->getName();
3153                 }
3154
3155                 // Allow extensions to add their custom variables to the mw.config map.
3156                 // Use the 'ResourceLoaderGetConfigVars' hook if the variable is not
3157                 // page-dependant but site-wide (without state).
3158                 // Alternatively, you may want to use OutputPage->addJsConfigVars() instead.
3159                 Hooks::run( 'MakeGlobalVariablesScript', [ &$vars, $this ] );
3160
3161                 // Merge in variables from addJsConfigVars last
3162                 return array_merge( $vars, $this->getJsConfigVars() );
3163         }
3164
3165         /**
3166          * To make it harder for someone to slip a user a fake
3167          * user-JavaScript or user-CSS preview, a random token
3168          * is associated with the login session. If it's not
3169          * passed back with the preview request, we won't render
3170          * the code.
3171          *
3172          * @return bool
3173          */
3174         public function userCanPreview() {
3175                 $request = $this->getRequest();
3176                 if (
3177                         $request->getVal( 'action' ) !== 'submit' ||
3178                         !$request->getCheck( 'wpPreview' ) ||
3179                         !$request->wasPosted()
3180                 ) {
3181                         return false;
3182                 }
3183
3184                 $user = $this->getUser();
3185
3186                 if ( !$user->isLoggedIn() ) {
3187                         // Anons have predictable edit tokens
3188                         return false;
3189                 }
3190                 if ( !$user->matchEditToken( $request->getVal( 'wpEditToken' ) ) ) {
3191                         return false;
3192                 }
3193
3194                 $title = $this->getTitle();
3195                 if ( !$title->isJsSubpage() && !$title->isCssSubpage() ) {
3196                         return false;
3197                 }
3198                 if ( !$title->isSubpageOf( $user->getUserPage() ) ) {
3199                         // Don't execute another user's CSS or JS on preview (T85855)
3200                         return false;
3201                 }
3202
3203                 $errors = $title->getUserPermissionsErrors( 'edit', $user );
3204                 if ( count( $errors ) !== 0 ) {
3205                         return false;
3206                 }
3207
3208                 return true;
3209         }
3210
3211         /**
3212          * @return array Array in format "link name or number => 'link html'".
3213          */
3214         public function getHeadLinksArray() {
3215                 global $wgVersion;
3216
3217                 $tags = [];
3218                 $config = $this->getConfig();
3219
3220                 $canonicalUrl = $this->mCanonicalUrl;
3221
3222                 $tags['meta-generator'] = Html::element( 'meta', [
3223                         'name' => 'generator',
3224                         'content' => "MediaWiki $wgVersion",
3225                 ] );
3226
3227                 if ( $config->get( 'ReferrerPolicy' ) !== false ) {
3228                         $tags['meta-referrer'] = Html::element( 'meta', [
3229                                 'name' => 'referrer',
3230                                 'content' => $config->get( 'ReferrerPolicy' )
3231                         ] );
3232                 }
3233
3234                 $p = "{$this->mIndexPolicy},{$this->mFollowPolicy}";
3235                 if ( $p !== 'index,follow' ) {
3236                         // http://www.robotstxt.org/wc/meta-user.html
3237                         // Only show if it's different from the default robots policy
3238                         $tags['meta-robots'] = Html::element( 'meta', [
3239                                 'name' => 'robots',
3240                                 'content' => $p,
3241                         ] );
3242                 }
3243
3244                 foreach ( $this->mMetatags as $tag ) {
3245                         if ( 0 == strcasecmp( 'http:', substr( $tag[0], 0, 5 ) ) ) {
3246                                 $a = 'http-equiv';
3247                                 $tag[0] = substr( $tag[0], 5 );
3248                         } else {
3249                                 $a = 'name';
3250                         }
3251                         $tagName = "meta-{$tag[0]}";
3252                         if ( isset( $tags[$tagName] ) ) {
3253                                 $tagName .= $tag[1];
3254                         }
3255                         $tags[$tagName] = Html::element( 'meta',
3256                                 [
3257                                         $a => $tag[0],
3258                                         'content' => $tag[1]
3259                                 ]
3260                         );
3261                 }
3262
3263                 foreach ( $this->mLinktags as $tag ) {
3264                         $tags[] = Html::element( 'link', $tag );
3265                 }
3266
3267                 # Universal edit button
3268                 if ( $config->get( 'UniversalEditButton' ) && $this->isArticleRelated() ) {
3269                         $user = $this->getUser();
3270                         if ( $this->getTitle()->quickUserCan( 'edit', $user )
3271                                 && ( $this->getTitle()->exists() ||
3272                                         $this->getTitle()->quickUserCan( 'create', $user ) )
3273                         ) {
3274                                 // Original UniversalEditButton
3275                                 $msg = $this->msg( 'edit' )->text();
3276                                 $tags['universal-edit-button'] = Html::element( 'link', [
3277                                         'rel' => 'alternate',
3278                                         'type' => 'application/x-wiki',
3279                                         'title' => $msg,
3280                                         'href' => $this->getTitle()->getEditURL(),
3281                                 ] );
3282                                 // Alternate edit link
3283                                 $tags['alternative-edit'] = Html::element( 'link', [
3284                                         'rel' => 'edit',
3285                                         'title' => $msg,
3286                                         'href' => $this->getTitle()->getEditURL(),
3287                                 ] );
3288                         }
3289                 }
3290
3291                 # Generally the order of the favicon and apple-touch-icon links
3292                 # should not matter, but Konqueror (3.5.9 at least) incorrectly
3293                 # uses whichever one appears later in the HTML source. Make sure
3294                 # apple-touch-icon is specified first to avoid this.
3295                 if ( $config->get( 'AppleTouchIcon' ) !== false ) {
3296                         $tags['apple-touch-icon'] = Html::element( 'link', [
3297                                 'rel' => 'apple-touch-icon',
3298                                 'href' => $config->get( 'AppleTouchIcon' )
3299                         ] );
3300                 }
3301
3302                 if ( $config->get( 'Favicon' ) !== false ) {
3303                         $tags['favicon'] = Html::element( 'link', [
3304                                 'rel' => 'shortcut icon',
3305                                 'href' => $config->get( 'Favicon' )
3306                         ] );
3307                 }
3308
3309                 # OpenSearch description link
3310                 $tags['opensearch'] = Html::element( 'link', [
3311                         'rel' => 'search',
3312                         'type' => 'application/opensearchdescription+xml',
3313                         'href' => wfScript( 'opensearch_desc' ),
3314                         'title' => $this->msg( 'opensearch-desc' )->inContentLanguage()->text(),
3315                 ] );
3316
3317                 if ( $config->get( 'EnableAPI' ) ) {
3318                         # Real Simple Discovery link, provides auto-discovery information
3319                         # for the MediaWiki API (and potentially additional custom API
3320                         # support such as WordPress or Twitter-compatible APIs for a
3321                         # blogging extension, etc)
3322                         $tags['rsd'] = Html::element( 'link', [
3323                                 'rel' => 'EditURI',
3324                                 'type' => 'application/rsd+xml',
3325                                 // Output a protocol-relative URL here if $wgServer is protocol-relative.
3326                                 // Whether RSD accepts relative or protocol-relative URLs is completely
3327                                 // undocumented, though.
3328                                 'href' => wfExpandUrl( wfAppendQuery(
3329                                         wfScript( 'api' ),
3330                                         [ 'action' => 'rsd' ] ),
3331                                         PROTO_RELATIVE
3332                                 ),
3333                         ] );
3334                 }
3335
3336                 # Language variants
3337                 if ( !$config->get( 'DisableLangConversion' ) ) {
3338                         $lang = $this->getTitle()->getPageLanguage();
3339                         if ( $lang->hasVariants() ) {
3340                                 $variants = $lang->getVariants();
3341                                 foreach ( $variants as $variant ) {
3342                                         $tags["variant-$variant"] = Html::element( 'link', [
3343                                                 'rel' => 'alternate',
3344                                                 'hreflang' => wfBCP47( $variant ),
3345                                                 'href' => $this->getTitle()->getLocalURL(
3346                                                         [ 'variant' => $variant ] )
3347                                                 ]
3348                                         );
3349                                 }
3350                                 # x-default link per https://support.google.com/webmasters/answer/189077?hl=en
3351                                 $tags["variant-x-default"] = Html::element( 'link', [
3352                                         'rel' => 'alternate',
3353                                         'hreflang' => 'x-default',
3354                                         'href' => $this->getTitle()->getLocalURL() ] );
3355                         }
3356                 }
3357
3358                 # Copyright
3359                 if ( $this->copyrightUrl !== null ) {
3360                         $copyright = $this->copyrightUrl;
3361                 } else {
3362                         $copyright = '';
3363                         if ( $config->get( 'RightsPage' ) ) {
3364                                 $copy = Title::newFromText( $config->get( 'RightsPage' ) );
3365
3366                                 if ( $copy ) {
3367                                         $copyright = $copy->getLocalURL();
3368                                 }
3369                         }
3370
3371                         if ( !$copyright && $config->get( 'RightsUrl' ) ) {
3372                                 $copyright = $config->get( 'RightsUrl' );
3373                         }
3374                 }
3375
3376                 if ( $copyright ) {
3377                         $tags['copyright'] = Html::element( 'link', [
3378                                 'rel' => 'copyright',
3379                                 'href' => $copyright ]
3380                         );
3381                 }
3382
3383                 # Feeds
3384                 if ( $config->get( 'Feed' ) ) {
3385                         $feedLinks = [];
3386
3387                         foreach ( $this->getSyndicationLinks() as $format => $link ) {
3388                                 # Use the page name for the title.  In principle, this could
3389                                 # lead to issues with having the same name for different feeds
3390                                 # corresponding to the same page, but we can't avoid that at
3391                                 # this low a level.
3392
3393                                 $feedLinks[] = $this->feedLink(
3394                                         $format,
3395                                         $link,
3396                                         # Used messages: 'page-rss-feed' and 'page-atom-feed' (for an easier grep)
3397                                         $this->msg(
3398                                                 "page-{$format}-feed", $this->getTitle()->getPrefixedText()
3399                                         )->text()
3400                                 );
3401                         }
3402
3403                         # Recent changes feed should appear on every page (except recentchanges,
3404                         # that would be redundant). Put it after the per-page feed to avoid
3405                         # changing existing behavior. It's still available, probably via a
3406                         # menu in your browser. Some sites might have a different feed they'd
3407                         # like to promote instead of the RC feed (maybe like a "Recent New Articles"
3408                         # or "Breaking news" one). For this, we see if $wgOverrideSiteFeed is defined.
3409                         # If so, use it instead.
3410                         $sitename = $config->get( 'Sitename' );
3411                         if ( $config->get( 'OverrideSiteFeed' ) ) {
3412                                 foreach ( $config->get( 'OverrideSiteFeed' ) as $type => $feedUrl ) {
3413                                         // Note, this->feedLink escapes the url.
3414                                         $feedLinks[] = $this->feedLink(
3415                                                 $type,
3416                                                 $feedUrl,
3417                                                 $this->msg( "site-{$type}-feed", $sitename )->text()
3418                                         );
3419                                 }
3420                         } elseif ( !$this->getTitle()->isSpecial( 'Recentchanges' ) ) {
3421                                 $rctitle = SpecialPage::getTitleFor( 'Recentchanges' );
3422                                 foreach ( $config->get( 'AdvertisedFeedTypes' ) as $format ) {
3423                                         $feedLinks[] = $this->feedLink(
3424                                                 $format,
3425                                                 $rctitle->getLocalURL( [ 'feed' => $format ] ),
3426                                                 # For grep: 'site-rss-feed', 'site-atom-feed'
3427                                                 $this->msg( "site-{$format}-feed", $sitename )->text()
3428                                         );
3429                                 }
3430                         }
3431
3432                         # Allow extensions to change the list pf feeds. This hook is primarily for changing,
3433                         # manipulating or removing existing feed tags. If you want to add new feeds, you should
3434                         # use OutputPage::addFeedLink() instead.
3435                         Hooks::run( 'AfterBuildFeedLinks', [ &$feedLinks ] );
3436
3437                         $tags += $feedLinks;
3438                 }
3439
3440                 # Canonical URL
3441                 if ( $config->get( 'EnableCanonicalServerLink' ) ) {
3442                         if ( $canonicalUrl !== false ) {
3443                                 $canonicalUrl = wfExpandUrl( $canonicalUrl, PROTO_CANONICAL );
3444                         } else {
3445                                 if ( $this->isArticleRelated() ) {
3446                                         // This affects all requests where "setArticleRelated" is true. This is
3447                                         // typically all requests that show content (query title, curid, oldid, diff),
3448                                         // and all wikipage actions (edit, delete, purge, info, history etc.).
3449                                         // It does not apply to File pages and Special pages.
3450                                         // 'history' and 'info' actions address page metadata rather than the page
3451                                         // content itself, so they may not be canonicalized to the view page url.
3452                                         // TODO: this ought to be better encapsulated in the Action class.
3453                                         $action = Action::getActionName( $this->getContext() );
3454                                         if ( in_array( $action, [ 'history', 'info' ] ) ) {
3455                                                 $query = "action={$action}";
3456                                         } else {
3457                                                 $query = '';
3458                                         }
3459                                         $canonicalUrl = $this->getTitle()->getCanonicalURL( $query );
3460                                 } else {
3461                                         $reqUrl = $this->getRequest()->getRequestURL();
3462                                         $canonicalUrl = wfExpandUrl( $reqUrl, PROTO_CANONICAL );
3463                                 }
3464                         }
3465                 }
3466                 if ( $canonicalUrl !== false ) {
3467                         $tags[] = Html::element( 'link', [
3468                                 'rel' => 'canonical',
3469                                 'href' => $canonicalUrl
3470                         ] );
3471                 }
3472
3473                 return $tags;
3474         }
3475
3476         /**
3477          * @return string HTML tag links to be put in the header.
3478          * @deprecated since 1.24 Use OutputPage::headElement or if you have to,
3479          *   OutputPage::getHeadLinksArray directly.
3480          */
3481         public function getHeadLinks() {
3482                 wfDeprecated( __METHOD__, '1.24' );
3483                 return implode( "\n", $this->getHeadLinksArray() );
3484         }
3485
3486         /**
3487          * Generate a "<link rel/>" for a feed.
3488          *
3489          * @param string $type Feed type
3490          * @param string $url URL to the feed
3491          * @param string $text Value of the "title" attribute
3492          * @return string HTML fragment
3493          */
3494         private function feedLink( $type, $url, $text ) {
3495                 return Html::element( 'link', [
3496                         'rel' => 'alternate',
3497                         'type' => "application/$type+xml",
3498                         'title' => $text,
3499                         'href' => $url ]
3500                 );
3501         }
3502
3503         /**
3504          * Add a local or specified stylesheet, with the given media options.
3505          * Internal use only. Use OutputPage::addModuleStyles() if possible.
3506          *
3507          * @param string $style URL to the file
3508          * @param string $media To specify a media type, 'screen', 'printable', 'handheld' or any.
3509          * @param string $condition For IE conditional comments, specifying an IE version
3510          * @param string $dir Set to 'rtl' or 'ltr' for direction-specific sheets
3511          */
3512         public function addStyle( $style, $media = '', $condition = '', $dir = '' ) {
3513                 $options = [];
3514                 if ( $media ) {
3515                         $options['media'] = $media;
3516                 }
3517                 if ( $condition ) {
3518                         $options['condition'] = $condition;
3519                 }
3520                 if ( $dir ) {
3521                         $options['dir'] = $dir;
3522                 }
3523                 $this->styles[$style] = $options;
3524         }
3525
3526         /**
3527          * Adds inline CSS styles
3528          * Internal use only. Use OutputPage::addModuleStyles() if possible.
3529          *
3530          * @param mixed $style_css Inline CSS
3531          * @param string $flip Set to 'flip' to flip the CSS if needed
3532          */
3533         public function addInlineStyle( $style_css, $flip = 'noflip' ) {
3534                 if ( $flip === 'flip' && $this->getLanguage()->isRTL() ) {
3535                         # If wanted, and the interface is right-to-left, flip the CSS
3536                         $style_css = CSSJanus::transform( $style_css, true, false );
3537                 }
3538                 $this->mInlineStyles .= Html::inlineStyle( $style_css );
3539         }
3540
3541         /**
3542          * Build exempt modules and legacy non-ResourceLoader styles.
3543          *
3544          * @return string|WrappedStringList HTML
3545          */
3546         protected function buildExemptModules() {
3547                 global $wgContLang;
3548
3549                 $resourceLoader = $this->getResourceLoader();
3550                 $chunks = [];
3551                 // Things that go after the ResourceLoaderDynamicStyles marker
3552                 $append = [];
3553
3554                 // Exempt 'user' styles module (may need 'excludepages' for live preview)
3555                 if ( $this->isUserCssPreview() ) {
3556                         $append[] = $this->makeResourceLoaderLink(
3557                                 'user.styles',
3558                                 ResourceLoaderModule::TYPE_STYLES,
3559                                 [ 'excludepage' => $this->getTitle()->getPrefixedDBkey() ]
3560                         );
3561
3562                         // Load the previewed CSS. Janus it if needed.
3563                         // User-supplied CSS is assumed to in the wiki's content language.
3564                         $previewedCSS = $this->getRequest()->getText( 'wpTextbox1' );
3565                         if ( $this->getLanguage()->getDir() !== $wgContLang->getDir() ) {
3566                                 $previewedCSS = CSSJanus::transform( $previewedCSS, true, false );
3567                         }
3568                         $append[] = Html::inlineStyle( $previewedCSS );
3569                 }
3570
3571                 // We want site, private and user styles to override dynamically added styles from
3572                 // general modules, but we want dynamically added styles to override statically added
3573                 // style modules. So the order has to be:
3574                 // - page style modules (formatted by ResourceLoaderClientHtml::getHeadHtml())
3575                 // - dynamically loaded styles (added by mw.loader before ResourceLoaderDynamicStyles)
3576                 // - ResourceLoaderDynamicStyles marker
3577                 // - site/private/user styles
3578
3579                 // Add legacy styles added through addStyle()/addInlineStyle() here
3580                 $chunks[] = implode( '', $this->buildCssLinksArray() ) . $this->mInlineStyles;
3581
3582                 $chunks[] = Html::element(
3583                         'meta',
3584                         [ 'name' => 'ResourceLoaderDynamicStyles', 'content' => '' ]
3585                 );
3586
3587                 foreach ( $this->rlExemptStyleModules as $group => $moduleNames ) {
3588                         $chunks[] = $this->makeResourceLoaderLink( $moduleNames,
3589                                 ResourceLoaderModule::TYPE_STYLES
3590                         );
3591                 }
3592
3593                 return self::combineWrappedStrings( array_merge( $chunks, $append ) );
3594         }
3595
3596         /**
3597          * @return array
3598          */
3599         public function buildCssLinksArray() {
3600                 $links = [];
3601
3602                 // Add any extension CSS
3603                 foreach ( $this->mExtStyles as $url ) {
3604                         $this->addStyle( $url );
3605                 }
3606                 $this->mExtStyles = [];
3607
3608                 foreach ( $this->styles as $file => $options ) {
3609                         $link = $this->styleLink( $file, $options );
3610                         if ( $link ) {
3611                                 $links[$file] = $link;
3612                         }
3613                 }
3614                 return $links;
3615         }
3616
3617         /**
3618          * Generate \<link\> tags for stylesheets
3619          *
3620          * @param string $style URL to the file
3621          * @param array $options Option, can contain 'condition', 'dir', 'media' keys
3622          * @return string HTML fragment
3623          */
3624         protected function styleLink( $style, array $options ) {
3625                 if ( isset( $options['dir'] ) ) {
3626                         if ( $this->getLanguage()->getDir() != $options['dir'] ) {
3627                                 return '';
3628                         }
3629                 }
3630
3631                 if ( isset( $options['media'] ) ) {
3632                         $media = self::transformCssMedia( $options['media'] );
3633                         if ( is_null( $media ) ) {
3634                                 return '';
3635                         }
3636                 } else {
3637                         $media = 'all';
3638                 }
3639
3640                 if ( substr( $style, 0, 1 ) == '/' ||
3641                         substr( $style, 0, 5 ) == 'http:' ||
3642                         substr( $style, 0, 6 ) == 'https:' ) {
3643                         $url = $style;
3644                 } else {
3645                         $config = $this->getConfig();
3646                         $url = $config->get( 'StylePath' ) . '/' . $style . '?' .
3647                                 $config->get( 'StyleVersion' );
3648                 }
3649
3650                 $link = Html::linkedStyle( $url, $media );
3651
3652                 if ( isset( $options['condition'] ) ) {
3653                         $condition = htmlspecialchars( $options['condition'] );
3654                         $link = "<!--[if $condition]>$link<![endif]-->";
3655                 }
3656                 return $link;
3657         }
3658
3659         /**
3660          * Transform path to web-accessible static resource.
3661          *
3662          * This is used to add a validation hash as query string.
3663          * This aids various behaviors:
3664          *
3665          * - Put long Cache-Control max-age headers on responses for improved
3666          *   cache performance.
3667          * - Get the correct version of a file as expected by the current page.
3668          * - Instantly get the updated version of a file after deployment.
3669          *
3670          * Avoid using this for urls included in HTML as otherwise clients may get different
3671          * versions of a resource when navigating the site depending on when the page was cached.
3672          * If changes to the url propagate, this is not a problem (e.g. if the url is in
3673          * an external stylesheet).
3674          *
3675          * @since 1.27
3676          * @param Config $config
3677          * @param string $path Path-absolute URL to file (from document root, must start with "/")
3678          * @return string URL
3679          */
3680         public static function transformResourcePath( Config $config, $path ) {
3681                 global $IP;
3682                 $remotePathPrefix = $config->get( 'ResourceBasePath' );
3683                 if ( $remotePathPrefix === '' ) {
3684                         // The configured base path is required to be empty string for
3685                         // wikis in the domain root
3686                         $remotePath = '/';
3687                 } else {
3688                         $remotePath = $remotePathPrefix;
3689                 }
3690                 if ( strpos( $path, $remotePath ) !== 0 ) {
3691                         // Path is outside wgResourceBasePath, ignore.
3692                         return $path;
3693                 }
3694                 $path = RelPath\getRelativePath( $path, $remotePath );
3695                 return self::transformFilePath( $remotePathPrefix, $IP, $path );
3696         }
3697
3698         /**
3699          * Utility method for transformResourceFilePath().
3700          *
3701          * Caller is responsible for ensuring the file exists. Emits a PHP warning otherwise.
3702          *
3703          * @since 1.27
3704          * @param string $remotePath URL path prefix that points to $localPath
3705          * @param string $localPath File directory exposed at $remotePath
3706          * @param string $file Path to target file relative to $localPath
3707          * @return string URL
3708          */
3709         public static function transformFilePath( $remotePathPrefix, $localPath, $file ) {
3710                 $hash = md5_file( "$localPath/$file" );
3711                 if ( $hash === false ) {
3712                         wfLogWarning( __METHOD__ . ": Failed to hash $localPath/$file" );
3713                         $hash = '';
3714                 }
3715                 return "$remotePathPrefix/$file?" . substr( $hash, 0, 5 );
3716         }
3717
3718         /**
3719          * Transform "media" attribute based on request parameters
3720          *
3721          * @param string $media Current value of the "media" attribute
3722          * @return string Modified value of the "media" attribute, or null to skip
3723          * this stylesheet
3724          */
3725         public static function transformCssMedia( $media ) {
3726                 global $wgRequest;
3727
3728                 // https://www.w3.org/TR/css3-mediaqueries/#syntax
3729                 $screenMediaQueryRegex = '/^(?:only\s+)?screen\b/i';
3730
3731                 // Switch in on-screen display for media testing
3732                 $switches = [
3733                         'printable' => 'print',
3734                         'handheld' => 'handheld',
3735                 ];
3736                 foreach ( $switches as $switch => $targetMedia ) {
3737                         if ( $wgRequest->getBool( $switch ) ) {
3738                                 if ( $media == $targetMedia ) {
3739                                         $media = '';
3740                                 } elseif ( preg_match( $screenMediaQueryRegex, $media ) === 1 ) {
3741                                         /* This regex will not attempt to understand a comma-separated media_query_list
3742                                          *
3743                                          * Example supported values for $media:
3744                                          * 'screen', 'only screen', 'screen and (min-width: 982px)' ),
3745                                          * Example NOT supported value for $media:
3746                                          * '3d-glasses, screen, print and resolution > 90dpi'
3747                                          *
3748                                          * If it's a print request, we never want any kind of screen stylesheets
3749                                          * If it's a handheld request (currently the only other choice with a switch),
3750                                          * we don't want simple 'screen' but we might want screen queries that
3751                                          * have a max-width or something, so we'll pass all others on and let the
3752                                          * client do the query.
3753                                          */
3754                                         if ( $targetMedia == 'print' || $media == 'screen' ) {
3755                                                 return null;
3756                                         }
3757                                 }
3758                         }
3759                 }
3760
3761                 return $media;
3762         }
3763
3764         /**
3765          * Add a wikitext-formatted message to the output.
3766          * This is equivalent to:
3767          *
3768          *    $wgOut->addWikiText( wfMessage( ... )->plain() )
3769          */
3770         public function addWikiMsg( /*...*/ ) {
3771                 $args = func_get_args();
3772                 $name = array_shift( $args );
3773                 $this->addWikiMsgArray( $name, $args );
3774         }
3775
3776         /**
3777          * Add a wikitext-formatted message to the output.
3778          * Like addWikiMsg() except the parameters are taken as an array
3779          * instead of a variable argument list.
3780          *
3781          * @param string $name
3782          * @param array $args
3783          */
3784         public function addWikiMsgArray( $name, $args ) {
3785                 $this->addHTML( $this->msg( $name, $args )->parseAsBlock() );
3786         }
3787
3788         /**
3789          * This function takes a number of message/argument specifications, wraps them in
3790          * some overall structure, and then parses the result and adds it to the output.
3791          *
3792          * In the $wrap, $1 is replaced with the first message, $2 with the second,
3793          * and so on. The subsequent arguments may be either
3794          * 1) strings, in which case they are message names, or
3795          * 2) arrays, in which case, within each array, the first element is the message
3796          *    name, and subsequent elements are the parameters to that message.
3797          *
3798          * Don't use this for messages that are not in the user's interface language.
3799          *
3800          * For example:
3801          *
3802          *    $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>", 'some-error' );
3803          *
3804          * Is equivalent to:
3805          *
3806          *    $wgOut->addWikiText( "<div class='error'>\n"
3807          *        . wfMessage( 'some-error' )->plain() . "\n</div>" );
3808          *
3809          * The newline after the opening div is needed in some wikitext. See bug 19226.
3810          *
3811          * @param string $wrap
3812          */
3813         public function wrapWikiMsg( $wrap /*, ...*/ ) {
3814                 $msgSpecs = func_get_args();
3815                 array_shift( $msgSpecs );
3816                 $msgSpecs = array_values( $msgSpecs );
3817                 $s = $wrap;
3818                 foreach ( $msgSpecs as $n => $spec ) {
3819                         if ( is_array( $spec ) ) {
3820                                 $args = $spec;
3821                                 $name = array_shift( $args );
3822                                 if ( isset( $args['options'] ) ) {
3823                                         unset( $args['options'] );
3824                                         wfDeprecated(
3825                                                 'Adding "options" to ' . __METHOD__ . ' is no longer supported',
3826                                                 '1.20'
3827                                         );
3828                                 }
3829                         } else {
3830                                 $args = [];
3831                                 $name = $spec;
3832                         }
3833                         $s = str_replace( '$' . ( $n + 1 ), $this->msg( $name, $args )->plain(), $s );
3834                 }
3835                 $this->addWikiText( $s );
3836         }
3837
3838         /**
3839          * Enables/disables TOC, doesn't override __NOTOC__
3840          * @param bool $flag
3841          * @since 1.22
3842          */
3843         public function enableTOC( $flag = true ) {
3844                 $this->mEnableTOC = $flag;
3845         }
3846
3847         /**
3848          * @return bool
3849          * @since 1.22
3850          */
3851         public function isTOCEnabled() {
3852                 return $this->mEnableTOC;
3853         }
3854
3855         /**
3856          * Enables/disables section edit links, doesn't override __NOEDITSECTION__
3857          * @param bool $flag
3858          * @since 1.23
3859          */
3860         public function enableSectionEditLinks( $flag = true ) {
3861                 $this->mEnableSectionEditLinks = $flag;
3862         }
3863
3864         /**
3865          * @return bool
3866          * @since 1.23
3867          */
3868         public function sectionEditLinksEnabled() {
3869                 return $this->mEnableSectionEditLinks;
3870         }
3871
3872         /**
3873          * Helper function to setup the PHP implementation of OOUI to use in this request.
3874          *
3875          * @since 1.26
3876          * @param String $skinName The Skin name to determine the correct OOUI theme
3877          * @param String $dir Language direction
3878          */
3879         public static function setupOOUI( $skinName = '', $dir = 'ltr' ) {
3880                 $themes = ExtensionRegistry::getInstance()->getAttribute( 'SkinOOUIThemes' );
3881                 // Make keys (skin names) lowercase for case-insensitive matching.
3882                 $themes = array_change_key_case( $themes, CASE_LOWER );
3883                 $theme = isset( $themes[$skinName] ) ? $themes[$skinName] : 'MediaWiki';
3884                 // For example, 'OOUI\MediaWikiTheme'.
3885                 $themeClass = "OOUI\\{$theme}Theme";
3886                 OOUI\Theme::setSingleton( new $themeClass() );
3887                 OOUI\Element::setDefaultDir( $dir );
3888         }
3889
3890         /**
3891          * Add ResourceLoader module styles for OOUI and set up the PHP implementation of it for use with
3892          * MediaWiki and this OutputPage instance.
3893          *
3894          * @since 1.25
3895          */
3896         public function enableOOUI() {
3897                 self::setupOOUI(
3898                         strtolower( $this->getSkin()->getSkinName() ),
3899                         $this->getLanguage()->getDir()
3900                 );
3901                 $this->addModuleStyles( [
3902                         'oojs-ui-core.styles',
3903                         'oojs-ui.styles.icons',
3904                         'oojs-ui.styles.indicators',
3905                         'oojs-ui.styles.textures',
3906                         'mediawiki.widgets.styles',
3907                 ] );
3908         }
3909 }