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         /** @var array Profiling data */
 303         private $limitReportJSData = [];
 304
 305         /**
 306          * Constructor for OutputPage. This should not be called directly.
 307          * Instead a new RequestContext should be created and it will implicitly create
 308          * a OutputPage tied to that context.
 309          * @param IContextSource|null $context
 310          */
 311         function __construct( IContextSource $context = null ) {
 312                 if ( $context === null ) {
 313                         # Extensions should use `new RequestContext` instead of `new OutputPage` now.
 314                         wfDeprecated( __METHOD__, '1.18' );
 315                 } else {
 316                         $this->setContext( $context );
 317                 }
 318         }
 319
 320         /**
 321          * Redirect to $url rather than displaying the normal page
 322          *
 323          * @param string $url URL
 324          * @param string $responsecode HTTP status code
 325          */
 326         public function redirect( $url, $responsecode = '302' ) {
 327                 # Strip newlines as a paranoia check for header injection in PHP<5.1.2
 328                 $this->mRedirect = str_replace( "\n", '', $url );
 329                 $this->mRedirectCode = $responsecode;
 330         }
 331
 332         /**
 333          * Get the URL to redirect to, or an empty string if not redirect URL set
 334          *
 335          * @return string
 336          */
 337         public function getRedirect() {
 338                 return $this->mRedirect;
 339         }
 340
 341         /**
 342          * Set the copyright URL to send with the output.
 343          * Empty string to omit, null to reset.
 344          *
 345          * @since 1.26
 346          *
 347          * @param string|null $url
 348          */
 349         public function setCopyrightUrl( $url ) {
 350                 $this->copyrightUrl = $url;
 351         }
 352
 353         /**
 354          * Set the HTTP status code to send with the output.
 355          *
 356          * @param int $statusCode
 357          */
 358         public function setStatusCode( $statusCode ) {
 359                 $this->mStatusCode = $statusCode;
 360         }
 361
 362         /**
 363          * Add a new "<meta>" tag
 364          * To add an http-equiv meta tag, precede the name with "http:"
 365          *
 366          * @param string $name Tag name
 367          * @param string $val Tag value
 368          */
 369         function addMeta( $name, $val ) {
 370                 array_push( $this->mMetatags, [ $name, $val ] );
 371         }
 372
 373         /**
 374          * Returns the current <meta> tags
 375          *
 376          * @since 1.25
 377          * @return array
 378          */
 379         public function getMetaTags() {
 380                 return $this->mMetatags;
 381         }
 382
 383         /**
 384          * Add a new \<link\> tag to the page header.
 385          *
 386          * Note: use setCanonicalUrl() for rel=canonical.
 387          *
 388          * @param array $linkarr Associative array of attributes.
 389          */
 390         function addLink( array $linkarr ) {
 391                 array_push( $this->mLinktags, $linkarr );
 392         }
 393
 394         /**
 395          * Returns the current <link> tags
 396          *
 397          * @since 1.25
 398          * @return array
 399          */
 400         public function getLinkTags() {
 401                 return $this->mLinktags;
 402         }
 403
 404         /**
 405          * Add a new \<link\> with "rel" attribute set to "meta"
 406          *
 407          * @param array $linkarr Associative array mapping attribute names to their
 408          *                 values, both keys and values will be escaped, and the
 409          *                 "rel" attribute will be automatically added
 410          */
 411         function addMetadataLink( array $linkarr ) {
 412                 $linkarr['rel'] = $this->getMetadataAttribute();
 413                 $this->addLink( $linkarr );
 414         }
 415
 416         /**
 417          * Set the URL to be used for the <link rel=canonical>. This should be used
 418          * in preference to addLink(), to avoid duplicate link tags.
 419          * @param string $url
 420          */
 421         function setCanonicalUrl( $url ) {
 422                 $this->mCanonicalUrl = $url;
 423         }
 424
 425         /**
 426          * Returns the URL to be used for the <link rel=canonical> if
 427          * one is set.
 428          *
 429          * @since 1.25
 430          * @return bool|string
 431          */
 432         public function getCanonicalUrl() {
 433                 return $this->mCanonicalUrl;
 434         }
 435
 436         /**
 437          * Get the value of the "rel" attribute for metadata links
 438          *
 439          * @return string
 440          */
 441         public function getMetadataAttribute() {
 442                 # note: buggy CC software only reads first "meta" link
 443                 static $haveMeta = false;
 444                 if ( $haveMeta ) {
 445                         return 'alternate meta';
 446                 } else {
 447                         $haveMeta = true;
 448                         return 'meta';
 449                 }
 450         }
 451
 452         /**
 453          * Add raw HTML to the list of scripts (including \<script\> tag, etc.)
 454          * Internal use only. Use OutputPage::addModules() or OutputPage::addJsConfigVars()
 455          * if possible.
 456          *
 457          * @param string $script Raw HTML
 458          */
 459         function addScript( $script ) {
 460                 $this->mScripts .= $script;
 461         }
 462
 463         /**
 464          * Register and add a stylesheet from an extension directory.
 465          *
 466          * @deprecated since 1.27 use addModuleStyles() or addStyle() instead
 467          * @param string $url Path to sheet.  Provide either a full url (beginning
 468          *             with 'http', etc) or a relative path from the document root
 469          *             (beginning with '/').  Otherwise it behaves identically to
 470          *             addStyle() and draws from the /skins folder.
 471          */
 472         public function addExtensionStyle( $url ) {
 473                 wfDeprecated( __METHOD__, '1.27' );
 474                 array_push( $this->mExtStyles, $url );
 475         }
 476
 477         /**
 478          * Get all styles added by extensions
 479          *
 480          * @deprecated since 1.27
 481          * @return array
 482          */
 483         function getExtStyle() {
 484                 wfDeprecated( __METHOD__, '1.27' );
 485                 return $this->mExtStyles;
 486         }
 487
 488         /**
 489          * Add a JavaScript file out of skins/common, or a given relative path.
 490          * Internal use only. Use OutputPage::addModules() if possible.
 491          *
 492          * @param string $file Filename in skins/common or complete on-server path
 493          *              (/foo/bar.js)
 494          * @param string $version Style version of the file. Defaults to $wgStyleVersion
 495          */
 496         public function addScriptFile( $file, $version = null ) {
 497                 // See if $file parameter is an absolute URL or begins with a slash
 498                 if ( substr( $file, 0, 1 ) == '/' || preg_match( '#^[a-z]*://#i', $file ) ) {
 499                         $path = $file;
 500                 } else {
 501                         $path = $this->getConfig()->get( 'StylePath' ) . "/common/{$file}";
 502                 }
 503                 if ( is_null( $version ) ) {
 504                         $version = $this->getConfig()->get( 'StyleVersion' );
 505                 }
 506                 $this->addScript( Html::linkedScript( wfAppendQuery( $path, $version ) ) );
 507         }
 508
 509         /**
 510          * Add a self-contained script tag with the given contents
 511          * Internal use only. Use OutputPage::addModules() if possible.
 512          *
 513          * @param string $script JavaScript text, no script tags
 514          */
 515         public function addInlineScript( $script ) {
 516                 $this->mScripts .= Html::inlineScript( $script );
 517         }
 518
 519         /**
 520          * Filter an array of modules to remove insufficiently trustworthy members, and modules
 521          * which are no longer registered (eg a page is cached before an extension is disabled)
 522          * @param array $modules
 523          * @param string|null $position If not null, only return modules with this position
 524          * @param string $type
 525          * @return array
 526          */
 527         protected function filterModules( array $modules, $position = null,
 528                 $type = ResourceLoaderModule::TYPE_COMBINED
 529         ) {
 530                 $resourceLoader = $this->getResourceLoader();
 531                 $filteredModules = [];
 532                 foreach ( $modules as $val ) {
 533                         $module = $resourceLoader->getModule( $val );
 534                         if ( $module instanceof ResourceLoaderModule
 535                                 && $module->getOrigin() <= $this->getAllowedModules( $type )
 536                                 && ( is_null( $position ) || $module->getPosition() == $position )
 537                         ) {
 538                                 if ( $this->mTarget && !in_array( $this->mTarget, $module->getTargets() ) ) {
 539                                         $this->warnModuleTargetFilter( $module->getName() );
 540                                         continue;
 541                                 }
 542                                 $filteredModules[] = $val;
 543                         }
 544                 }
 545                 return $filteredModules;
 546         }
 547
 548         private function warnModuleTargetFilter( $moduleName ) {
 549                 static $warnings = [];
 550                 if ( isset( $warnings[$this->mTarget][$moduleName] ) ) {
 551                         return;
 552                 }
 553                 $warnings[$this->mTarget][$moduleName] = true;
 554                 $this->getResourceLoader()->getLogger()->debug(
 555                         'Module "{module}" not loadable on target "{target}".',
 556                         [
 557                                 'module' => $moduleName,
 558                                 'target' => $this->mTarget,
 559                         ]
 560                 );
 561         }
 562
 563         /**
 564          * Get the list of modules to include on this page
 565          *
 566          * @param bool $filter Whether to filter out insufficiently trustworthy modules
 567          * @param string|null $position If not null, only return modules with this position
 568          * @param string $param
 569          * @return array Array of module names
 570          */
 571         public function getModules( $filter = false, $position = null, $param = 'mModules',
 572                 $type = ResourceLoaderModule::TYPE_COMBINED
 573         ) {
 574                 $modules = array_values( array_unique( $this->$param ) );
 575                 return $filter
 576                         ? $this->filterModules( $modules, $position, $type )
 577                         : $modules;
 578         }
 579
 580         /**
 581          * Add one or more modules recognized by ResourceLoader. Modules added
 582          * through this function will be loaded by ResourceLoader when the
 583          * page loads.
 584          *
 585          * @param string|array $modules Module name (string) or array of module names
 586          */
 587         public function addModules( $modules ) {
 588                 $this->mModules = array_merge( $this->mModules, (array)$modules );
 589         }
 590
 591         /**
 592          * Get the list of module JS to include on this page
 593          *
 594          * @param bool $filter
 595          * @param string|null $position
 596          * @return array Array of module names
 597          */
 598         public function getModuleScripts( $filter = false, $position = null ) {
 599                 return $this->getModules( $filter, $position, 'mModuleScripts',
 600                         ResourceLoaderModule::TYPE_SCRIPTS
 601                 );
 602         }
 603
 604         /**
 605          * Add only JS of one or more modules recognized by ResourceLoader. Module
 606          * scripts added through this function will be loaded by ResourceLoader when
 607          * the page loads.
 608          *
 609          * @param string|array $modules Module name (string) or array of module names
 610          */
 611         public function addModuleScripts( $modules ) {
 612                 $this->mModuleScripts = array_merge( $this->mModuleScripts, (array)$modules );
 613         }
 614
 615         /**
 616          * Get the list of module CSS to include on this page
 617          *
 618          * @param bool $filter
 619          * @param string|null $position
 620          * @return array Array of module names
 621          */
 622         public function getModuleStyles( $filter = false, $position = null ) {
 623                 return $this->getModules( $filter, $position, 'mModuleStyles',
 624                         ResourceLoaderModule::TYPE_STYLES
 625                 );
 626         }
 627
 628         /**
 629          * Add only CSS of one or more modules recognized by ResourceLoader.
 630          *
 631          * Module styles added through this function will be added using standard link CSS
 632          * tags, rather than as a combined Javascript and CSS package. Thus, they will
 633          * load when JavaScript is disabled (unless CSS also happens to be disabled).
 634          *
 635          * @param string|array $modules Module name (string) or array of module names
 636          */
 637         public function addModuleStyles( $modules ) {
 638                 $this->mModuleStyles = array_merge( $this->mModuleStyles, (array)$modules );
 639         }
 640
 641         /**
 642          * @return null|string ResourceLoader target
 643          */
 644         public function getTarget() {
 645                 return $this->mTarget;
 646         }
 647
 648         /**
 649          * Sets ResourceLoader target for load.php links. If null, will be omitted
 650          *
 651          * @param string|null $target
 652          */
 653         public function setTarget( $target ) {
 654                 $this->mTarget = $target;
 655         }
 656
 657         /**
 658          * Get an array of head items
 659          *
 660          * @return array
 661          */
 662         function getHeadItemsArray() {
 663                 return $this->mHeadItems;
 664         }
 665
 666         /**
 667          * Add or replace a head item to the output
 668          *
 669          * Whenever possible, use more specific options like ResourceLoader modules,
 670          * OutputPage::addLink(), OutputPage::addMetaLink() and OutputPage::addFeedLink()
 671          * Fallback options for those are: OutputPage::addStyle, OutputPage::addScript(),
 672          * OutputPage::addInlineScript() and OutputPage::addInlineStyle()
 673          * This would be your very LAST fallback.
 674          *
 675          * @param string $name Item name
 676          * @param string $value Raw HTML
 677          */
 678         public function addHeadItem( $name, $value ) {
 679                 $this->mHeadItems[$name] = $value;
 680         }
 681
 682         /**
 683          * Add one or more head items to the output
 684          *
 685          * @since 1.28
 686          * @param string|string[] $value Raw HTML
 687          */
 688         public function addHeadItems( $values ) {
 689                 $this->mHeadItems = array_merge( $this->mHeadItems, (array)$values );
 690         }
 691
 692         /**
 693          * Check if the header item $name is already set
 694          *
 695          * @param string $name Item name
 696          * @return bool
 697          */
 698         public function hasHeadItem( $name ) {
 699                 return isset( $this->mHeadItems[$name] );
 700         }
 701
 702         /**
 703          * @deprecated since 1.28 Obsolete - wgUseETag experiment was removed.
 704          * @param string $tag
 705          */
 706         public function setETag( $tag ) {
 707         }
 708
 709         /**
 710          * Set whether the output should only contain the body of the article,
 711          * without any skin, sidebar, etc.
 712          * Used e.g. when calling with "action=render".
 713          *
 714          * @param bool $only Whether to output only the body of the article
 715          */
 716         public function setArticleBodyOnly( $only ) {
 717                 $this->mArticleBodyOnly = $only;
 718         }
 719
 720         /**
 721          * Return whether the output will contain only the body of the article
 722          *
 723          * @return bool
 724          */
 725         public function getArticleBodyOnly() {
 726                 return $this->mArticleBodyOnly;
 727         }
 728
 729         /**
 730          * Set an additional output property
 731          * @since 1.21
 732          *
 733          * @param string $name
 734          * @param mixed $value
 735          */
 736         public function setProperty( $name, $value ) {
 737                 $this->mProperties[$name] = $value;
 738         }
 739
 740         /**
 741          * Get an additional output property
 742          * @since 1.21
 743          *
 744          * @param string $name
 745          * @return mixed Property value or null if not found
 746          */
 747         public function getProperty( $name ) {
 748                 if ( isset( $this->mProperties[$name] ) ) {
 749                         return $this->mProperties[$name];
 750                 } else {
 751                         return null;
 752                 }
 753         }
 754
 755         /**
 756          * checkLastModified tells the client to use the client-cached page if
 757          * possible. If successful, the OutputPage is disabled so that
 758          * any future call to OutputPage->output() have no effect.
 759          *
 760          * Side effect: sets mLastModified for Last-Modified header
 761          *
 762          * @param string $timestamp
 763          *
 764          * @return bool True if cache-ok headers was sent.
 765          */
 766         public function checkLastModified( $timestamp ) {
 767                 if ( !$timestamp || $timestamp == '19700101000000' ) {
 768                         wfDebug( __METHOD__ . ": CACHE DISABLED, NO TIMESTAMP\n" );
 769                         return false;
 770                 }
 771                 $config = $this->getConfig();
 772                 if ( !$config->get( 'CachePages' ) ) {
 773                         wfDebug( __METHOD__ . ": CACHE DISABLED\n" );
 774                         return false;
 775                 }
 776
 777                 $timestamp = wfTimestamp( TS_MW, $timestamp );
 778                 $modifiedTimes = [
 779                         'page' => $timestamp,
 780                         'user' => $this->getUser()->getTouched(),
 781                         'epoch' => $config->get( 'CacheEpoch' )
 782                 ];
 783                 if ( $config->get( 'UseSquid' ) ) {
 784                         // T46570: the core page itself may not change, but resources might
 785                         $modifiedTimes['sepoch'] = wfTimestamp( TS_MW, time() - $config->get( 'SquidMaxage' ) );
 786                 }
 787                 Hooks::run( 'OutputPageCheckLastModified', [ &$modifiedTimes, $this ] );
 788
 789                 $maxModified = max( $modifiedTimes );
 790                 $this->mLastModified = wfTimestamp( TS_RFC2822, $maxModified );
 791
 792                 $clientHeader = $this->getRequest()->getHeader( 'If-Modified-Since' );
 793                 if ( $clientHeader === false ) {
 794                         wfDebug( __METHOD__ . ": client did not send If-Modified-Since header", 'private' );
 795                         return false;
 796                 }
 797
 798                 # IE sends sizes after the date like this:
 799                 # Wed, 20 Aug 2003 06:51:19 GMT; length=5202
 800                 # this breaks strtotime().
 801                 $clientHeader = preg_replace( '/;.*$/', '', $clientHeader );
 802
 803                 MediaWiki\suppressWarnings(); // E_STRICT system time bitching
 804                 $clientHeaderTime = strtotime( $clientHeader );
 805                 MediaWiki\restoreWarnings();
 806                 if ( !$clientHeaderTime ) {
 807                         wfDebug( __METHOD__
 808                                 . ": unable to parse the client's If-Modified-Since header: $clientHeader\n" );
 809                         return false;
 810                 }
 811                 $clientHeaderTime = wfTimestamp( TS_MW, $clientHeaderTime );
 812
 813                 # Make debug info
 814                 $info = '';
 815                 foreach ( $modifiedTimes as $name => $value ) {
 816                         if ( $info !== '' ) {
 817                                 $info .= ', ';
 818                         }
 819                         $info .= "$name=" . wfTimestamp( TS_ISO_8601, $value );
 820                 }
 821
 822                 wfDebug( __METHOD__ . ": client sent If-Modified-Since: " .
 823                         wfTimestamp( TS_ISO_8601, $clientHeaderTime ), 'private' );
 824                 wfDebug( __METHOD__ . ": effective Last-Modified: " .
 825                         wfTimestamp( TS_ISO_8601, $maxModified ), 'private' );
 826                 if ( $clientHeaderTime < $maxModified ) {
 827                         wfDebug( __METHOD__ . ": STALE, $info", 'private' );
 828                         return false;
 829                 }
 830
 831                 # Not modified
 832                 # Give a 304 Not Modified response code and disable body output
 833                 wfDebug( __METHOD__ . ": NOT MODIFIED, $info", 'private' );
 834                 ini_set( 'zlib.output_compression', 0 );
 835                 $this->getRequest()->response()->statusHeader( 304 );
 836                 $this->sendCacheControl();
 837                 $this->disable();
 838
 839                 // Don't output a compressed blob when using ob_gzhandler;
 840                 // it's technically against HTTP spec and seems to confuse
 841                 // Firefox when the response gets split over two packets.
 842                 wfClearOutputBuffers();
 843
 844                 return true;
 845         }
 846
 847         /**
 848          * Override the last modified timestamp
 849          *
 850          * @param string $timestamp New timestamp, in a format readable by
 851          *        wfTimestamp()
 852          */
 853         public function setLastModified( $timestamp ) {
 854                 $this->mLastModified = wfTimestamp( TS_RFC2822, $timestamp );
 855         }
 856
 857         /**
 858          * Set the robot policy for the page: <http://www.robotstxt.org/meta.html>
 859          *
 860          * @param string $policy The literal string to output as the contents of
 861          *   the meta tag.  Will be parsed according to the spec and output in
 862          *   standardized form.
 863          * @return null
 864          */
 865         public function setRobotPolicy( $policy ) {
 866                 $policy = Article::formatRobotPolicy( $policy );
 867
 868                 if ( isset( $policy['index'] ) ) {
 869                         $this->setIndexPolicy( $policy['index'] );
 870                 }
 871                 if ( isset( $policy['follow'] ) ) {
 872                         $this->setFollowPolicy( $policy['follow'] );
 873                 }
 874         }
 875
 876         /**
 877          * Set the index policy for the page, but leave the follow policy un-
 878          * touched.
 879          *
 880          * @param string $policy Either 'index' or 'noindex'.
 881          * @return null
 882          */
 883         public function setIndexPolicy( $policy ) {
 884                 $policy = trim( $policy );
 885                 if ( in_array( $policy, [ 'index', 'noindex' ] ) ) {
 886                         $this->mIndexPolicy = $policy;
 887                 }
 888         }
 889
 890         /**
 891          * Set the follow policy for the page, but leave the index policy un-
 892          * touched.
 893          *
 894          * @param string $policy Either 'follow' or 'nofollow'.
 895          * @return null
 896          */
 897         public function setFollowPolicy( $policy ) {
 898                 $policy = trim( $policy );
 899                 if ( in_array( $policy, [ 'follow', 'nofollow' ] ) ) {
 900                         $this->mFollowPolicy = $policy;
 901                 }
 902         }
 903
 904         /**
 905          * Set the new value of the "action text", this will be added to the
 906          * "HTML title", separated from it with " - ".
 907          *
 908          * @param string $text New value of the "action text"
 909          */
 910         public function setPageTitleActionText( $text ) {
 911                 $this->mPageTitleActionText = $text;
 912         }
 913
 914         /**
 915          * Get the value of the "action text"
 916          *
 917          * @return string
 918          */
 919         public function getPageTitleActionText() {
 920                 return $this->mPageTitleActionText;
 921         }
 922
 923         /**
 924          * "HTML title" means the contents of "<title>".
 925          * It is stored as plain, unescaped text and will be run through htmlspecialchars in the skin file.
 926          *
 927          * @param string|Message $name
 928          */
 929         public function setHTMLTitle( $name ) {
 930                 if ( $name instanceof Message ) {
 931                         $this->mHTMLtitle = $name->setContext( $this->getContext() )->text();
 932                 } else {
 933                         $this->mHTMLtitle = $name;
 934                 }
 935         }
 936
 937         /**
 938          * Return the "HTML title", i.e. the content of the "<title>" tag.
 939          *
 940          * @return string
 941          */
 942         public function getHTMLTitle() {
 943                 return $this->mHTMLtitle;
 944         }
 945
 946         /**
 947          * Set $mRedirectedFrom, the Title of the page which redirected us to the current page.
 948          *
 949          * @param Title $t
 950          */
 951         public function setRedirectedFrom( $t ) {
 952                 $this->mRedirectedFrom = $t;
 953         }
 954
 955         /**
 956          * "Page title" means the contents of \<h1\>. It is stored as a valid HTML
 957          * fragment. This function allows good tags like \<sup\> in the \<h1\> tag,
 958          * but not bad tags like \<script\>. This function automatically sets
 959          * \<title\> to the same content as \<h1\> but with all tags removed. Bad
 960          * tags that were escaped in \<h1\> will still be escaped in \<title\>, and
 961          * good tags like \<i\> will be dropped entirely.
 962          *
 963          * @param string|Message $name
 964          */
 965         public function setPageTitle( $name ) {
 966                 if ( $name instanceof Message ) {
 967                         $name = $name->setContext( $this->getContext() )->text();
 968                 }
 969
 970                 # change "<script>foo&bar</script>" to "&lt;script&gt;foo&amp;bar&lt;/script&gt;"
 971                 # but leave "<i>foobar</i>" alone
 972                 $nameWithTags = Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags( $name ) );
 973                 $this->mPagetitle = $nameWithTags;
 974
 975                 # change "<i>foo&amp;bar</i>" to "foo&bar"
 976                 $this->setHTMLTitle(
 977                         $this->msg( 'pagetitle' )->rawParams( Sanitizer::stripAllTags( $nameWithTags ) )
 978                                 ->inContentLanguage()
 979                 );
 980         }
 981
 982         /**
 983          * Return the "page title", i.e. the content of the \<h1\> tag.
 984          *
 985          * @return string
 986          */
 987         public function getPageTitle() {
 988                 return $this->mPagetitle;
 989         }
 990
 991         /**
 992          * Set the Title object to use
 993          *
 994          * @param Title $t
 995          */
 996         public function setTitle( Title $t ) {
 997                 $this->getContext()->setTitle( $t );
 998         }
 999
1000         /**
1001          * Replace the subtitle with $str
1002          *
1003          * @param string|Message $str New value of the subtitle. String should be safe HTML.
1004          */
1005         public function setSubtitle( $str ) {
1006                 $this->clearSubtitle();
1007                 $this->addSubtitle( $str );
1008         }
1009
1010         /**
1011          * Add $str to the subtitle
1012          *
1013          * @param string|Message $str String or Message to add to the subtitle. String should be safe HTML.
1014          */
1015         public function addSubtitle( $str ) {
1016                 if ( $str instanceof Message ) {
1017                         $this->mSubtitle[] = $str->setContext( $this->getContext() )->parse();
1018                 } else {
1019                         $this->mSubtitle[] = $str;
1020                 }
1021         }
1022
1023         /**
1024          * Build message object for a subtitle containing a backlink to a page
1025          *
1026          * @param Title $title Title to link to
1027          * @param array $query Array of additional parameters to include in the link
1028          * @return Message
1029          * @since 1.25
1030          */
1031         public static function buildBacklinkSubtitle( Title $title, $query = [] ) {
1032                 if ( $title->isRedirect() ) {
1033                         $query['redirect'] = 'no';
1034                 }
1035                 $linkRenderer = MediaWikiServices::getInstance()->getLinkRenderer();
1036                 return wfMessage( 'backlinksubtitle' )
1037                         ->rawParams( $linkRenderer->makeLink( $title, null, [], $query ) );
1038         }
1039
1040         /**
1041          * Add a subtitle containing a backlink to a page
1042          *
1043          * @param Title $title Title to link to
1044          * @param array $query Array of additional parameters to include in the link
1045          */
1046         public function addBacklinkSubtitle( Title $title, $query = [] ) {
1047                 $this->addSubtitle( self::buildBacklinkSubtitle( $title, $query ) );
1048         }
1049
1050         /**
1051          * Clear the subtitles
1052          */
1053         public function clearSubtitle() {
1054                 $this->mSubtitle = [];
1055         }
1056
1057         /**
1058          * Get the subtitle
1059          *
1060          * @return string
1061          */
1062         public function getSubtitle() {
1063                 return implode( "<br />\n\t\t\t\t", $this->mSubtitle );
1064         }
1065
1066         /**
1067          * Set the page as printable, i.e. it'll be displayed with all
1068          * print styles included
1069          */
1070         public function setPrintable() {
1071                 $this->mPrintable = true;
1072         }
1073
1074         /**
1075          * Return whether the page is "printable"
1076          *
1077          * @return bool
1078          */
1079         public function isPrintable() {
1080                 return $this->mPrintable;
1081         }
1082
1083         /**
1084          * Disable output completely, i.e. calling output() will have no effect
1085          */
1086         public function disable() {
1087                 $this->mDoNothing = true;
1088         }
1089
1090         /**
1091          * Return whether the output will be completely disabled
1092          *
1093          * @return bool
1094          */
1095         public function isDisabled() {
1096                 return $this->mDoNothing;
1097         }
1098
1099         /**
1100          * Show an "add new section" link?
1101          *
1102          * @return bool
1103          */
1104         public function showNewSectionLink() {
1105                 return $this->mNewSectionLink;
1106         }
1107
1108         /**
1109          * Forcibly hide the new section link?
1110          *
1111          * @return bool
1112          */
1113         public function forceHideNewSectionLink() {
1114                 return $this->mHideNewSectionLink;
1115         }
1116
1117         /**
1118          * Add or remove feed links in the page header
1119          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
1120          * for the new version
1121          * @see addFeedLink()
1122          *
1123          * @param bool $show True: add default feeds, false: remove all feeds
1124          */
1125         public function setSyndicated( $show = true ) {
1126                 if ( $show ) {
1127                         $this->setFeedAppendQuery( false );
1128                 } else {
1129                         $this->mFeedLinks = [];
1130                 }
1131         }
1132
1133         /**
1134          * Add default feeds to the page header
1135          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
1136          * for the new version
1137          * @see addFeedLink()
1138          *
1139          * @param string $val Query to append to feed links or false to output
1140          *        default links
1141          */
1142         public function setFeedAppendQuery( $val ) {
1143                 $this->mFeedLinks = [];
1144
1145                 foreach ( $this->getConfig()->get( 'AdvertisedFeedTypes' ) as $type ) {
1146                         $query = "feed=$type";
1147                         if ( is_string( $val ) ) {
1148                                 $query .= '&' . $val;
1149                         }
1150                         $this->mFeedLinks[$type] = $this->getTitle()->getLocalURL( $query );
1151                 }
1152         }
1153
1154         /**
1155          * Add a feed link to the page header
1156          *
1157          * @param string $format Feed type, should be a key of $wgFeedClasses
1158          * @param string $href URL
1159          */
1160         public function addFeedLink( $format, $href ) {
1161                 if ( in_array( $format, $this->getConfig()->get( 'AdvertisedFeedTypes' ) ) ) {
1162                         $this->mFeedLinks[$format] = $href;
1163                 }
1164         }
1165
1166         /**
1167          * Should we output feed links for this page?
1168          * @return bool
1169          */
1170         public function isSyndicated() {
1171                 return count( $this->mFeedLinks ) > 0;
1172         }
1173
1174         /**
1175          * Return URLs for each supported syndication format for this page.
1176          * @return array Associating format keys with URLs
1177          */
1178         public function getSyndicationLinks() {
1179                 return $this->mFeedLinks;
1180         }
1181
1182         /**
1183          * Will currently always return null
1184          *
1185          * @return null
1186          */
1187         public function getFeedAppendQuery() {
1188                 return $this->mFeedLinksAppendQuery;
1189         }
1190
1191         /**
1192          * Set whether the displayed content is related to the source of the
1193          * corresponding article on the wiki
1194          * Setting true will cause the change "article related" toggle to true
1195          *
1196          * @param bool $v
1197          */
1198         public function setArticleFlag( $v ) {
1199                 $this->mIsarticle = $v;
1200                 if ( $v ) {
1201                         $this->mIsArticleRelated = $v;
1202                 }
1203         }
1204
1205         /**
1206          * Return whether the content displayed page is related to the source of
1207          * the corresponding article on the wiki
1208          *
1209          * @return bool
1210          */
1211         public function isArticle() {
1212                 return $this->mIsarticle;
1213         }
1214
1215         /**
1216          * Set whether this page is related an article on the wiki
1217          * Setting false will cause the change of "article flag" toggle to false
1218          *
1219          * @param bool $v
1220          */
1221         public function setArticleRelated( $v ) {
1222                 $this->mIsArticleRelated = $v;
1223                 if ( !$v ) {
1224                         $this->mIsarticle = false;
1225                 }
1226         }
1227
1228         /**
1229          * Return whether this page is related an article on the wiki
1230          *
1231          * @return bool
1232          */
1233         public function isArticleRelated() {
1234                 return $this->mIsArticleRelated;
1235         }
1236
1237         /**
1238          * Add new language links
1239          *
1240          * @param string[] $newLinkArray Array of interwiki-prefixed (non DB key) titles
1241          *                               (e.g. 'fr:Test page')
1242          */
1243         public function addLanguageLinks( array $newLinkArray ) {
1244                 $this->mLanguageLinks += $newLinkArray;
1245         }
1246
1247         /**
1248          * Reset the language links and add new language links
1249          *
1250          * @param string[] $newLinkArray Array of interwiki-prefixed (non DB key) titles
1251          *                               (e.g. 'fr:Test page')
1252          */
1253         public function setLanguageLinks( array $newLinkArray ) {
1254                 $this->mLanguageLinks = $newLinkArray;
1255         }
1256
1257         /**
1258          * Get the list of language links
1259          *
1260          * @return string[] Array of interwiki-prefixed (non DB key) titles (e.g. 'fr:Test page')
1261          */
1262         public function getLanguageLinks() {
1263                 return $this->mLanguageLinks;
1264         }
1265
1266         /**
1267          * Add an array of categories, with names in the keys
1268          *
1269          * @param array $categories Mapping category name => sort key
1270          */
1271         public function addCategoryLinks( array $categories ) {
1272                 global $wgContLang;
1273
1274                 if ( !is_array( $categories ) || count( $categories ) == 0 ) {
1275                         return;
1276                 }
1277
1278                 $res = $this->addCategoryLinksToLBAndGetResult( $categories );
1279
1280                 # Set all the values to 'normal'.
1281                 $categories = array_fill_keys( array_keys( $categories ), 'normal' );
1282
1283                 # Mark hidden categories
1284                 foreach ( $res as $row ) {
1285                         if ( isset( $row->pp_value ) ) {
1286                                 $categories[$row->page_title] = 'hidden';
1287                         }
1288                 }
1289
1290                 // Avoid PHP 7.1 warning of passing $this by reference
1291                 $outputPage = $this;
1292                 # Add the remaining categories to the skin
1293                 if ( Hooks::run(
1294                         'OutputPageMakeCategoryLinks',
1295                         [ &$outputPage, $categories, &$this->mCategoryLinks ] )
1296                 ) {
1297                         $linkRenderer = MediaWikiServices::getInstance()->getLinkRenderer();
1298                         foreach ( $categories as $category => $type ) {
1299                                 // array keys will cast numeric category names to ints, so cast back to string
1300                                 $category = (string)$category;
1301                                 $origcategory = $category;
1302                                 $title = Title::makeTitleSafe( NS_CATEGORY, $category );
1303                                 if ( !$title ) {
1304                                         continue;
1305                                 }
1306                                 $wgContLang->findVariantLink( $category, $title, true );
1307                                 if ( $category != $origcategory && array_key_exists( $category, $categories ) ) {
1308                                         continue;
1309                                 }
1310                                 $text = $wgContLang->convertHtml( $title->getText() );
1311                                 $this->mCategories[$type][] = $title->getText();
1312                                 $this->mCategoryLinks[$type][] = $linkRenderer->makeLink( $title, new HtmlArmor( $text ) );
1313                         }
1314                 }
1315         }
1316
1317         /**
1318          * @param array $categories
1319          * @return bool|ResultWrapper
1320          */
1321         protected function addCategoryLinksToLBAndGetResult( array $categories ) {
1322                 # Add the links to a LinkBatch
1323                 $arr = [ NS_CATEGORY => $categories ];
1324                 $lb = new LinkBatch;
1325                 $lb->setArray( $arr );
1326
1327                 # Fetch existence plus the hiddencat property
1328                 $dbr = wfGetDB( DB_REPLICA );
1329                 $fields = array_merge(
1330                         LinkCache::getSelectFields(),
1331                         [ 'page_namespace', 'page_title', 'pp_value' ]
1332                 );
1333
1334                 $res = $dbr->select( [ 'page', 'page_props' ],
1335                         $fields,
1336                         $lb->constructSet( 'page', $dbr ),
1337                         __METHOD__,
1338                         [],
1339                         [ 'page_props' => [ 'LEFT JOIN', [
1340                                 'pp_propname' => 'hiddencat',
1341                                 'pp_page = page_id'
1342                         ] ] ]
1343                 );
1344
1345                 # Add the results to the link cache
1346                 $lb->addResultToCache( LinkCache::singleton(), $res );
1347
1348                 return $res;
1349         }
1350
1351         /**
1352          * Reset the category links (but not the category list) and add $categories
1353          *
1354          * @param array $categories Mapping category name => sort key
1355          */
1356         public function setCategoryLinks( array $categories ) {
1357                 $this->mCategoryLinks = [];
1358                 $this->addCategoryLinks( $categories );
1359         }
1360
1361         /**
1362          * Get the list of category links, in a 2-D array with the following format:
1363          * $arr[$type][] = $link, where $type is either "normal" or "hidden" (for
1364          * hidden categories) and $link a HTML fragment with a link to the category
1365          * page
1366          *
1367          * @return array
1368          */
1369         public function getCategoryLinks() {
1370                 return $this->mCategoryLinks;
1371         }
1372
1373         /**
1374          * Get the list of category names this page belongs to.
1375          *
1376          * @param string $type The type of categories which should be returned. Possible values:
1377          *  * all: all categories of all types
1378          *  * hidden: only the hidden categories
1379          *  * normal: all categories, except hidden categories
1380          * @return array Array of strings
1381          */
1382         public function getCategories( $type = 'all' ) {
1383                 if ( $type === 'all' ) {
1384                         $allCategories = [];
1385                         foreach ( $this->mCategories as $categories ) {
1386                                 $allCategories = array_merge( $allCategories, $categories );
1387                         }
1388                         return $allCategories;
1389                 }
1390                 if ( !isset( $this->mCategories[$type] ) ) {
1391                         throw new InvalidArgumentException( 'Invalid category type given: ' . $type );
1392                 }
1393                 return $this->mCategories[$type];
1394         }
1395
1396         /**
1397          * Add an array of indicators, with their identifiers as array
1398          * keys and HTML contents as values.
1399          *
1400          * In case of duplicate keys, existing values are overwritten.
1401          *
1402          * @param array $indicators
1403          * @since 1.25
1404          */
1405         public function setIndicators( array $indicators ) {
1406                 $this->mIndicators = $indicators + $this->mIndicators;
1407                 // Keep ordered by key
1408                 ksort( $this->mIndicators );
1409         }
1410
1411         /**
1412          * Get the indicators associated with this page.
1413          *
1414          * The array will be internally ordered by item keys.
1415          *
1416          * @return array Keys: identifiers, values: HTML contents
1417          * @since 1.25
1418          */
1419         public function getIndicators() {
1420                 return $this->mIndicators;
1421         }
1422
1423         /**
1424          * Adds help link with an icon via page indicators.
1425          * Link target can be overridden by a local message containing a wikilink:
1426          * the message key is: lowercase action or special page name + '-helppage'.
1427          * @param string $to Target MediaWiki.org page title or encoded URL.
1428          * @param bool $overrideBaseUrl Whether $url is a full URL, to avoid MW.o.
1429          * @since 1.25
1430          */
1431         public function addHelpLink( $to, $overrideBaseUrl = false ) {
1432                 $this->addModuleStyles( 'mediawiki.helplink' );
1433                 $text = $this->msg( 'helppage-top-gethelp' )->escaped();
1434
1435                 if ( $overrideBaseUrl ) {
1436                         $helpUrl = $to;
1437                 } else {
1438                         $toUrlencoded = wfUrlencode( str_replace( ' ', '_', $to ) );
1439                         $helpUrl = "//www.mediawiki.org/wiki/Special:MyLanguage/$toUrlencoded";
1440                 }
1441
1442                 $link = Html::rawElement(
1443                         'a',
1444                         [
1445                                 'href' => $helpUrl,
1446                                 'target' => '_blank',
1447                                 'class' => 'mw-helplink',
1448                         ],
1449                         $text
1450                 );
1451
1452                 $this->setIndicators( [ 'mw-helplink' => $link ] );
1453         }
1454
1455         /**
1456          * Do not allow scripts which can be modified by wiki users to load on this page;
1457          * only allow scripts bundled with, or generated by, the software.
1458          * Site-wide styles are controlled by a config setting, since they can be
1459          * used to create a custom skin/theme, but not user-specific ones.
1460          *
1461          * @todo this should be given a more accurate name
1462          */
1463         public function disallowUserJs() {
1464                 $this->reduceAllowedModules(
1465                         ResourceLoaderModule::TYPE_SCRIPTS,
1466                         ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL
1467                 );
1468
1469                 // Site-wide styles are controlled by a config setting, see T73621
1470                 // for background on why. User styles are never allowed.
1471                 if ( $this->getConfig()->get( 'AllowSiteCSSOnRestrictedPages' ) ) {
1472                         $styleOrigin = ResourceLoaderModule::ORIGIN_USER_SITEWIDE;
1473                 } else {
1474                         $styleOrigin = ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL;
1475                 }
1476                 $this->reduceAllowedModules(
1477                         ResourceLoaderModule::TYPE_STYLES,
1478                         $styleOrigin
1479                 );
1480         }
1481
1482         /**
1483          * Show what level of JavaScript / CSS untrustworthiness is allowed on this page
1484          * @see ResourceLoaderModule::$origin
1485          * @param string $type ResourceLoaderModule TYPE_ constant
1486          * @return int ResourceLoaderModule ORIGIN_ class constant
1487          */
1488         public function getAllowedModules( $type ) {
1489                 if ( $type == ResourceLoaderModule::TYPE_COMBINED ) {
1490                         return min( array_values( $this->mAllowedModules ) );
1491                 } else {
1492                         return isset( $this->mAllowedModules[$type] )
1493                                 ? $this->mAllowedModules[$type]
1494                                 : ResourceLoaderModule::ORIGIN_ALL;
1495                 }
1496         }
1497
1498         /**
1499          * Limit the highest level of CSS/JS untrustworthiness allowed.
1500          *
1501          * If passed the same or a higher level than the current level of untrustworthiness set, the
1502          * level will remain unchanged.
1503          *
1504          * @param string $type
1505          * @param int $level ResourceLoaderModule class constant
1506          */
1507         public function reduceAllowedModules( $type, $level ) {
1508                 $this->mAllowedModules[$type] = min( $this->getAllowedModules( $type ), $level );
1509         }
1510
1511         /**
1512          * Prepend $text to the body HTML
1513          *
1514          * @param string $text HTML
1515          */
1516         public function prependHTML( $text ) {
1517                 $this->mBodytext = $text . $this->mBodytext;
1518         }
1519
1520         /**
1521          * Append $text to the body HTML
1522          *
1523          * @param string $text HTML
1524          */
1525         public function addHTML( $text ) {
1526                 $this->mBodytext .= $text;
1527         }
1528
1529         /**
1530          * Shortcut for adding an Html::element via addHTML.
1531          *
1532          * @since 1.19
1533          *
1534          * @param string $element
1535          * @param array $attribs
1536          * @param string $contents
1537          */
1538         public function addElement( $element, array $attribs = [], $contents = '' ) {
1539                 $this->addHTML( Html::element( $element, $attribs, $contents ) );
1540         }
1541
1542         /**
1543          * Clear the body HTML
1544          */
1545         public function clearHTML() {
1546                 $this->mBodytext = '';
1547         }
1548
1549         /**
1550          * Get the body HTML
1551          *
1552          * @return string HTML
1553          */
1554         public function getHTML() {
1555                 return $this->mBodytext;
1556         }
1557
1558         /**
1559          * Get/set the ParserOptions object to use for wikitext parsing
1560          *
1561          * @param ParserOptions|null $options Either the ParserOption to use or null to only get the
1562          *   current ParserOption object
1563          * @return ParserOptions
1564          */
1565         public function parserOptions( $options = null ) {
1566                 if ( $options !== null && !empty( $options->isBogus ) ) {
1567                         // Someone is trying to set a bogus pre-$wgUser PO. Check if it has
1568                         // been changed somehow, and keep it if so.
1569                         $anonPO = ParserOptions::newFromAnon();
1570                         $anonPO->setEditSection( false );
1571                         $anonPO->setAllowUnsafeRawHtml( false );
1572                         if ( !$options->matches( $anonPO ) ) {
1573                                 wfLogWarning( __METHOD__ . ': Setting a changed bogus ParserOptions: ' . wfGetAllCallers( 5 ) );
1574                                 $options->isBogus = false;
1575                         }
1576                 }
1577
1578                 if ( !$this->mParserOptions ) {
1579                         if ( !$this->getContext()->getUser()->isSafeToLoad() ) {
1580                                 // $wgUser isn't unstubbable yet, so don't try to get a
1581                                 // ParserOptions for it. And don't cache this ParserOptions
1582                                 // either.
1583                                 $po = ParserOptions::newFromAnon();
1584                                 $po->setEditSection( false );
1585                                 $po->setAllowUnsafeRawHtml( false );
1586                                 $po->isBogus = true;
1587                                 if ( $options !== null ) {
1588                                         $this->mParserOptions = empty( $options->isBogus ) ? $options : null;
1589                                 }
1590                                 return $po;
1591                         }
1592
1593                         $this->mParserOptions = ParserOptions::newFromContext( $this->getContext() );
1594                         $this->mParserOptions->setEditSection( false );
1595                         $this->mParserOptions->setAllowUnsafeRawHtml( false );
1596                 }
1597
1598                 if ( $options !== null && !empty( $options->isBogus ) ) {
1599                         // They're trying to restore the bogus pre-$wgUser PO. Do the right
1600                         // thing.
1601                         return wfSetVar( $this->mParserOptions, null, true );
1602                 } else {
1603                         return wfSetVar( $this->mParserOptions, $options );
1604                 }
1605         }
1606
1607         /**
1608          * Set the revision ID which will be seen by the wiki text parser
1609          * for things such as embedded {{REVISIONID}} variable use.
1610          *
1611          * @param int|null $revid An positive integer, or null
1612          * @return mixed Previous value
1613          */
1614         public function setRevisionId( $revid ) {
1615                 $val = is_null( $revid ) ? null : intval( $revid );
1616                 return wfSetVar( $this->mRevisionId, $val );
1617         }
1618
1619         /**
1620          * Get the displayed revision ID
1621          *
1622          * @return int
1623          */
1624         public function getRevisionId() {
1625                 return $this->mRevisionId;
1626         }
1627
1628         /**
1629          * Set the timestamp of the revision which will be displayed. This is used
1630          * to avoid a extra DB call in Skin::lastModified().
1631          *
1632          * @param string|null $timestamp
1633          * @return mixed Previous value
1634          */
1635         public function setRevisionTimestamp( $timestamp ) {
1636                 return wfSetVar( $this->mRevisionTimestamp, $timestamp );
1637         }
1638
1639         /**
1640          * Get the timestamp of displayed revision.
1641          * This will be null if not filled by setRevisionTimestamp().
1642          *
1643          * @return string|null
1644          */
1645         public function getRevisionTimestamp() {
1646                 return $this->mRevisionTimestamp;
1647         }
1648
1649         /**
1650          * Set the displayed file version
1651          *
1652          * @param File|bool $file
1653          * @return mixed Previous value
1654          */
1655         public function setFileVersion( $file ) {
1656                 $val = null;
1657                 if ( $file instanceof File && $file->exists() ) {
1658                         $val = [ 'time' => $file->getTimestamp(), 'sha1' => $file->getSha1() ];
1659                 }
1660                 return wfSetVar( $this->mFileVersion, $val, true );
1661         }
1662
1663         /**
1664          * Get the displayed file version
1665          *
1666          * @return array|null ('time' => MW timestamp, 'sha1' => sha1)
1667          */
1668         public function getFileVersion() {
1669                 return $this->mFileVersion;
1670         }
1671
1672         /**
1673          * Get the templates used on this page
1674          *
1675          * @return array (namespace => dbKey => revId)
1676          * @since 1.18
1677          */
1678         public function getTemplateIds() {
1679                 return $this->mTemplateIds;
1680         }
1681
1682         /**
1683          * Get the files used on this page
1684          *
1685          * @return array (dbKey => array('time' => MW timestamp or null, 'sha1' => sha1 or ''))
1686          * @since 1.18
1687          */
1688         public function getFileSearchOptions() {
1689                 return $this->mImageTimeKeys;
1690         }
1691
1692         /**
1693          * Convert wikitext to HTML and add it to the buffer
1694          * Default assumes that the current page title will be used.
1695          *
1696          * @param string $text
1697          * @param bool $linestart Is this the start of a line?
1698          * @param bool $interface Is this text in the user interface language?
1699          * @throws MWException
1700          */
1701         public function addWikiText( $text, $linestart = true, $interface = true ) {
1702                 $title = $this->getTitle(); // Work around E_STRICT
1703                 if ( !$title ) {
1704                         throw new MWException( 'Title is null' );
1705                 }
1706                 $this->addWikiTextTitle( $text, $title, $linestart, /*tidy*/false, $interface );
1707         }
1708
1709         /**
1710          * Add wikitext with a custom Title object
1711          *
1712          * @param string $text Wikitext
1713          * @param Title $title
1714          * @param bool $linestart Is this the start of a line?
1715          */
1716         public function addWikiTextWithTitle( $text, &$title, $linestart = true ) {
1717                 $this->addWikiTextTitle( $text, $title, $linestart );
1718         }
1719
1720         /**
1721          * Add wikitext with a custom Title object and tidy enabled.
1722          *
1723          * @param string $text Wikitext
1724          * @param Title $title
1725          * @param bool $linestart Is this the start of a line?
1726          */
1727         function addWikiTextTitleTidy( $text, &$title, $linestart = true ) {
1728                 $this->addWikiTextTitle( $text, $title, $linestart, true );
1729         }
1730
1731         /**
1732          * Add wikitext with tidy enabled
1733          *
1734          * @param string $text Wikitext
1735          * @param bool $linestart Is this the start of a line?
1736          */
1737         public function addWikiTextTidy( $text, $linestart = true ) {
1738                 $title = $this->getTitle();
1739                 $this->addWikiTextTitleTidy( $text, $title, $linestart );
1740         }
1741
1742         /**
1743          * Add wikitext with a custom Title object
1744          *
1745          * @param string $text Wikitext
1746          * @param Title $title
1747          * @param bool $linestart Is this the start of a line?
1748          * @param bool $tidy Whether to use tidy
1749          * @param bool $interface Whether it is an interface message
1750          *   (for example disables conversion)
1751          */
1752         public function addWikiTextTitle( $text, Title $title, $linestart,
1753                 $tidy = false, $interface = false
1754         ) {
1755                 global $wgParser;
1756
1757                 $popts = $this->parserOptions();
1758                 $oldTidy = $popts->setTidy( $tidy );
1759                 $popts->setInterfaceMessage( (bool)$interface );
1760
1761                 $parserOutput = $wgParser->getFreshParser()->parse(
1762                         $text, $title, $popts,
1763                         $linestart, true, $this->mRevisionId
1764                 );
1765
1766                 $popts->setTidy( $oldTidy );
1767
1768                 $this->addParserOutput( $parserOutput );
1769         }
1770
1771         /**
1772          * Add a ParserOutput object, but without Html.
1773          *
1774          * @deprecated since 1.24, use addParserOutputMetadata() instead.
1775          * @param ParserOutput $parserOutput
1776          */
1777         public function addParserOutputNoText( $parserOutput ) {
1778                 wfDeprecated( __METHOD__, '1.24' );
1779                 $this->addParserOutputMetadata( $parserOutput );
1780         }
1781
1782         /**
1783          * Add all metadata associated with a ParserOutput object, but without the actual HTML. This
1784          * includes categories, language links, ResourceLoader modules, effects of certain magic words,
1785          * and so on.
1786          *
1787          * @since 1.24
1788          * @param ParserOutput $parserOutput
1789          */
1790         public function addParserOutputMetadata( $parserOutput ) {
1791                 $this->mLanguageLinks += $parserOutput->getLanguageLinks();
1792                 $this->addCategoryLinks( $parserOutput->getCategories() );
1793                 $this->setIndicators( $parserOutput->getIndicators() );
1794                 $this->mNewSectionLink = $parserOutput->getNewSection();
1795                 $this->mHideNewSectionLink = $parserOutput->getHideNewSection();
1796
1797                 if ( !$parserOutput->isCacheable() ) {
1798                         $this->enableClientCache( false );
1799                 }
1800                 $this->mNoGallery = $parserOutput->getNoGallery();
1801                 $this->mHeadItems = array_merge( $this->mHeadItems, $parserOutput->getHeadItems() );
1802                 $this->addModules( $parserOutput->getModules() );
1803                 $this->addModuleScripts( $parserOutput->getModuleScripts() );
1804                 $this->addModuleStyles( $parserOutput->getModuleStyles() );
1805                 $this->addJsConfigVars( $parserOutput->getJsConfigVars() );
1806                 $this->mPreventClickjacking = $this->mPreventClickjacking
1807                         || $parserOutput->preventClickjacking();
1808
1809                 // Template versioning...
1810                 foreach ( (array)$parserOutput->getTemplateIds() as $ns => $dbks ) {
1811                         if ( isset( $this->mTemplateIds[$ns] ) ) {
1812                                 $this->mTemplateIds[$ns] = $dbks + $this->mTemplateIds[$ns];
1813                         } else {
1814                                 $this->mTemplateIds[$ns] = $dbks;
1815                         }
1816                 }
1817                 // File versioning...
1818                 foreach ( (array)$parserOutput->getFileSearchOptions() as $dbk => $data ) {
1819                         $this->mImageTimeKeys[$dbk] = $data;
1820                 }
1821
1822                 // Hooks registered in the object
1823                 $parserOutputHooks = $this->getConfig()->get( 'ParserOutputHooks' );
1824                 foreach ( $parserOutput->getOutputHooks() as $hookInfo ) {
1825                         list( $hookName, $data ) = $hookInfo;
1826                         if ( isset( $parserOutputHooks[$hookName] ) ) {
1827                                 call_user_func( $parserOutputHooks[$hookName], $this, $parserOutput, $data );
1828                         }
1829                 }
1830
1831                 // Enable OOUI if requested via ParserOutput
1832                 if ( $parserOutput->getEnableOOUI() ) {
1833                         $this->enableOOUI();
1834                 }
1835
1836                 // Include parser limit report
1837                 if ( !$this->limitReportJSData ) {
1838                         $this->limitReportJSData = $parserOutput->getLimitReportJSData();
1839                 }
1840
1841                 // Link flags are ignored for now, but may in the future be
1842                 // used to mark individual language links.
1843                 $linkFlags = [];
1844                 // Avoid PHP 7.1 warning of passing $this by reference
1845                 $outputPage = $this;
1846                 Hooks::run( 'LanguageLinks', [ $this->getTitle(), &$this->mLanguageLinks, &$linkFlags ] );
1847                 Hooks::run( 'OutputPageParserOutput', [ &$outputPage, $parserOutput ] );
1848         }
1849
1850         /**
1851          * Add the HTML and enhancements for it (like ResourceLoader modules) associated with a
1852          * ParserOutput object, without any other metadata.
1853          *
1854          * @since 1.24
1855          * @param ParserOutput $parserOutput
1856          */
1857         public function addParserOutputContent( $parserOutput ) {
1858                 $this->addParserOutputText( $parserOutput );
1859
1860                 $this->addModules( $parserOutput->getModules() );
1861                 $this->addModuleScripts( $parserOutput->getModuleScripts() );
1862                 $this->addModuleStyles( $parserOutput->getModuleStyles() );
1863
1864                 $this->addJsConfigVars( $parserOutput->getJsConfigVars() );
1865         }
1866
1867         /**
1868          * Add the HTML associated with a ParserOutput object, without any metadata.
1869          *
1870          * @since 1.24
1871          * @param ParserOutput $parserOutput
1872          */
1873         public function addParserOutputText( $parserOutput ) {
1874                 $text = $parserOutput->getText();
1875                 // Avoid PHP 7.1 warning of passing $this by reference
1876                 $outputPage = $this;
1877                 Hooks::run( 'OutputPageBeforeHTML', [ &$outputPage, &$text ] );
1878                 $this->addHTML( $text );
1879         }
1880
1881         /**
1882          * Add everything from a ParserOutput object.
1883          *
1884          * @param ParserOutput $parserOutput
1885          */
1886         function addParserOutput( $parserOutput ) {
1887                 $this->addParserOutputMetadata( $parserOutput );
1888                 $parserOutput->setTOCEnabled( $this->mEnableTOC );
1889
1890                 // Touch section edit links only if not previously disabled
1891                 if ( $parserOutput->getEditSectionTokens() ) {
1892                         $parserOutput->setEditSectionTokens( $this->mEnableSectionEditLinks );
1893                 }
1894
1895                 $this->addParserOutputText( $parserOutput );
1896         }
1897
1898         /**
1899          * Add the output of a QuickTemplate to the output buffer
1900          *
1901          * @param QuickTemplate $template
1902          */
1903         public function addTemplate( &$template ) {
1904                 $this->addHTML( $template->getHTML() );
1905         }
1906
1907         /**
1908          * Parse wikitext and return the HTML.
1909          *
1910          * @param string $text
1911          * @param bool $linestart Is this the start of a line?
1912          * @param bool $interface Use interface language ($wgLang instead of
1913          *   $wgContLang) while parsing language sensitive magic words like GRAMMAR and PLURAL.
1914          *   This also disables LanguageConverter.
1915          * @param Language $language Target language object, will override $interface
1916          * @throws MWException
1917          * @return string HTML
1918          */
1919         public function parse( $text, $linestart = true, $interface = false, $language = null ) {
1920                 global $wgParser;
1921
1922                 if ( is_null( $this->getTitle() ) ) {
1923                         throw new MWException( 'Empty $mTitle in ' . __METHOD__ );
1924                 }
1925
1926                 $popts = $this->parserOptions();
1927                 if ( $interface ) {
1928                         $popts->setInterfaceMessage( true );
1929                 }
1930                 if ( $language !== null ) {
1931                         $oldLang = $popts->setTargetLanguage( $language );
1932                 }
1933
1934                 $parserOutput = $wgParser->getFreshParser()->parse(
1935                         $text, $this->getTitle(), $popts,
1936                         $linestart, true, $this->mRevisionId
1937                 );
1938
1939                 if ( $interface ) {
1940                         $popts->setInterfaceMessage( false );
1941                 }
1942                 if ( $language !== null ) {
1943                         $popts->setTargetLanguage( $oldLang );
1944                 }
1945
1946                 return $parserOutput->getText();
1947         }
1948
1949         /**
1950          * Parse wikitext, strip paragraphs, and return the HTML.
1951          *
1952          * @param string $text
1953          * @param bool $linestart Is this the start of a line?
1954          * @param bool $interface Use interface language ($wgLang instead of
1955          *   $wgContLang) while parsing language sensitive magic
1956          *   words like GRAMMAR and PLURAL
1957          * @return string HTML
1958          */
1959         public function parseInline( $text, $linestart = true, $interface = false ) {
1960                 $parsed = $this->parse( $text, $linestart, $interface );
1961                 return Parser::stripOuterParagraph( $parsed );
1962         }
1963
1964         /**
1965          * @param $maxage
1966          * @deprecated since 1.27 Use setCdnMaxage() instead
1967          */
1968         public function setSquidMaxage( $maxage ) {
1969                 $this->setCdnMaxage( $maxage );
1970         }
1971
1972         /**
1973          * Set the value of the "s-maxage" part of the "Cache-control" HTTP header
1974          *
1975          * @param int $maxage Maximum cache time on the CDN, in seconds.
1976          */
1977         public function setCdnMaxage( $maxage ) {
1978                 $this->mCdnMaxage = min( $maxage, $this->mCdnMaxageLimit );
1979         }
1980
1981         /**
1982          * Lower the value of the "s-maxage" part of the "Cache-control" HTTP header
1983          *
1984          * @param int $maxage Maximum cache time on the CDN, in seconds
1985          * @since 1.27
1986          */
1987         public function lowerCdnMaxage( $maxage ) {
1988                 $this->mCdnMaxageLimit = min( $maxage, $this->mCdnMaxageLimit );
1989                 $this->setCdnMaxage( $this->mCdnMaxage );
1990         }
1991
1992         /**
1993          * Get TTL in [$minTTL,$maxTTL] in pass it to lowerCdnMaxage()
1994          *
1995          * This sets and returns $minTTL if $mtime is false or null. Otherwise,
1996          * the TTL is higher the older the $mtime timestamp is. Essentially, the
1997          * TTL is 90% of the age of the object, subject to the min and max.
1998          *
1999          * @param string|integer|float|bool|null $mtime Last-Modified timestamp
2000          * @param integer $minTTL Mimimum TTL in seconds [default: 1 minute]
2001          * @param integer $maxTTL Maximum TTL in seconds [default: $wgSquidMaxage]
2002          * @return integer TTL in seconds
2003          * @since 1.28
2004          */
2005         public function adaptCdnTTL( $mtime, $minTTL = 0, $maxTTL = 0 ) {
2006                 $minTTL = $minTTL ?: IExpiringStore::TTL_MINUTE;
2007                 $maxTTL = $maxTTL ?: $this->getConfig()->get( 'SquidMaxage' );
2008
2009                 if ( $mtime === null || $mtime === false ) {
2010                         return $minTTL; // entity does not exist
2011                 }
2012
2013                 $age = time() - wfTimestamp( TS_UNIX, $mtime );
2014                 $adaptiveTTL = max( .9 * $age, $minTTL );
2015                 $adaptiveTTL = min( $adaptiveTTL, $maxTTL );
2016
2017                 $this->lowerCdnMaxage( (int)$adaptiveTTL );
2018
2019                 return $adaptiveTTL;
2020         }
2021
2022         /**
2023          * Use enableClientCache(false) to force it to send nocache headers
2024          *
2025          * @param bool $state
2026          *
2027          * @return bool
2028          */
2029         public function enableClientCache( $state ) {
2030                 return wfSetVar( $this->mEnableClientCache, $state );
2031         }
2032
2033         /**
2034          * Get the list of cookies that will influence on the cache
2035          *
2036          * @return array
2037          */
2038         function getCacheVaryCookies() {
2039                 static $cookies;
2040                 if ( $cookies === null ) {
2041                         $config = $this->getConfig();
2042                         $cookies = array_merge(
2043                                 SessionManager::singleton()->getVaryCookies(),
2044                                 [
2045                                         'forceHTTPS',
2046                                 ],
2047                                 $config->get( 'CacheVaryCookies' )
2048                         );
2049                         Hooks::run( 'GetCacheVaryCookies', [ $this, &$cookies ] );
2050                 }
2051                 return $cookies;
2052         }
2053
2054         /**
2055          * Check if the request has a cache-varying cookie header
2056          * If it does, it's very important that we don't allow public caching
2057          *
2058          * @return bool
2059          */
2060         function haveCacheVaryCookies() {
2061                 $request = $this->getRequest();
2062                 foreach ( $this->getCacheVaryCookies() as $cookieName ) {
2063                         if ( $request->getCookie( $cookieName, '', '' ) !== '' ) {
2064                                 wfDebug( __METHOD__ . ": found $cookieName\n" );
2065                                 return true;
2066                         }
2067                 }
2068                 wfDebug( __METHOD__ . ": no cache-varying cookies found\n" );
2069                 return false;
2070         }
2071
2072         /**
2073          * Add an HTTP header that will influence on the cache
2074          *
2075          * @param string $header Header name
2076          * @param string[]|null $option Options for the Key header. See
2077          * https://datatracker.ietf.org/doc/draft-fielding-http-key/
2078          * for the list of valid options.
2079          */
2080         public function addVaryHeader( $header, array $option = null ) {
2081                 if ( !array_key_exists( $header, $this->mVaryHeader ) ) {
2082                         $this->mVaryHeader[$header] = [];
2083                 }
2084                 if ( !is_array( $option ) ) {
2085                         $option = [];
2086                 }
2087                 $this->mVaryHeader[$header] = array_unique( array_merge( $this->mVaryHeader[$header], $option ) );
2088         }
2089
2090         /**
2091          * Return a Vary: header on which to vary caches. Based on the keys of $mVaryHeader,
2092          * such as Accept-Encoding or Cookie
2093          *
2094          * @return string
2095          */
2096         public function getVaryHeader() {
2097                 // If we vary on cookies, let's make sure it's always included here too.
2098                 if ( $this->getCacheVaryCookies() ) {
2099                         $this->addVaryHeader( 'Cookie' );
2100                 }
2101
2102                 foreach ( SessionManager::singleton()->getVaryHeaders() as $header => $options ) {
2103                         $this->addVaryHeader( $header, $options );
2104                 }
2105                 return 'Vary: ' . implode( ', ', array_keys( $this->mVaryHeader ) );
2106         }
2107
2108         /**
2109          * Get a complete Key header
2110          *
2111          * @return string
2112          */
2113         public function getKeyHeader() {
2114                 $cvCookies = $this->getCacheVaryCookies();
2115
2116                 $cookiesOption = [];
2117                 foreach ( $cvCookies as $cookieName ) {
2118                         $cookiesOption[] = 'param=' . $cookieName;
2119                 }
2120                 $this->addVaryHeader( 'Cookie', $cookiesOption );
2121
2122                 foreach ( SessionManager::singleton()->getVaryHeaders() as $header => $options ) {
2123                         $this->addVaryHeader( $header, $options );
2124                 }
2125
2126                 $headers = [];
2127                 foreach ( $this->mVaryHeader as $header => $option ) {
2128                         $newheader = $header;
2129                         if ( is_array( $option ) && count( $option ) > 0 ) {
2130                                 $newheader .= ';' . implode( ';', $option );
2131                         }
2132                         $headers[] = $newheader;
2133                 }
2134                 $key = 'Key: ' . implode( ',', $headers );
2135
2136                 return $key;
2137         }
2138
2139         /**
2140          * T23672: Add Accept-Language to Vary and Key headers
2141          * if there's no 'variant' parameter existed in GET.
2142          *
2143          * For example:
2144          *   /w/index.php?title=Main_page should always be served; but
2145          *   /w/index.php?title=Main_page&variant=zh-cn should never be served.
2146          */
2147         function addAcceptLanguage() {
2148                 $title = $this->getTitle();
2149                 if ( !$title instanceof Title ) {
2150                         return;
2151                 }
2152
2153                 $lang = $title->getPageLanguage();
2154                 if ( !$this->getRequest()->getCheck( 'variant' ) && $lang->hasVariants() ) {
2155                         $variants = $lang->getVariants();
2156                         $aloption = [];
2157                         foreach ( $variants as $variant ) {
2158                                 if ( $variant === $lang->getCode() ) {
2159                                         continue;
2160                                 } else {
2161                                         $aloption[] = 'substr=' . $variant;
2162
2163                                         // IE and some other browsers use BCP 47 standards in
2164                                         // their Accept-Language header, like "zh-CN" or "zh-Hant".
2165                                         // We should handle these too.
2166                                         $variantBCP47 = wfBCP47( $variant );
2167                                         if ( $variantBCP47 !== $variant ) {
2168                                                 $aloption[] = 'substr=' . $variantBCP47;
2169                                         }
2170                                 }
2171                         }
2172                         $this->addVaryHeader( 'Accept-Language', $aloption );
2173                 }
2174         }
2175
2176         /**
2177          * Set a flag which will cause an X-Frame-Options header appropriate for
2178          * edit pages to be sent. The header value is controlled by
2179          * $wgEditPageFrameOptions.
2180          *
2181          * This is the default for special pages. If you display a CSRF-protected
2182          * form on an ordinary view page, then you need to call this function.
2183          *
2184          * @param bool $enable
2185          */
2186         public function preventClickjacking( $enable = true ) {
2187                 $this->mPreventClickjacking = $enable;
2188         }
2189
2190         /**
2191          * Turn off frame-breaking. Alias for $this->preventClickjacking(false).
2192          * This can be called from pages which do not contain any CSRF-protected
2193          * HTML form.
2194          */
2195         public function allowClickjacking() {
2196                 $this->mPreventClickjacking = false;
2197         }
2198
2199         /**
2200          * Get the prevent-clickjacking flag
2201          *
2202          * @since 1.24
2203          * @return bool
2204          */
2205         public function getPreventClickjacking() {
2206                 return $this->mPreventClickjacking;
2207         }
2208
2209         /**
2210          * Get the X-Frame-Options header value (without the name part), or false
2211          * if there isn't one. This is used by Skin to determine whether to enable
2212          * JavaScript frame-breaking, for clients that don't support X-Frame-Options.
2213          *
2214          * @return string|false
2215          */
2216         public function getFrameOptions() {
2217                 $config = $this->getConfig();
2218                 if ( $config->get( 'BreakFrames' ) ) {
2219                         return 'DENY';
2220                 } elseif ( $this->mPreventClickjacking && $config->get( 'EditPageFrameOptions' ) ) {
2221                         return $config->get( 'EditPageFrameOptions' );
2222                 }
2223                 return false;
2224         }
2225
2226         /**
2227          * Send cache control HTTP headers
2228          */
2229         public function sendCacheControl() {
2230                 $response = $this->getRequest()->response();
2231                 $config = $this->getConfig();
2232
2233                 $this->addVaryHeader( 'Cookie' );
2234                 $this->addAcceptLanguage();
2235
2236                 # don't serve compressed data to clients who can't handle it
2237                 # maintain different caches for logged-in users and non-logged in ones
2238                 $response->header( $this->getVaryHeader() );
2239
2240                 if ( $config->get( 'UseKeyHeader' ) ) {
2241                         $response->header( $this->getKeyHeader() );
2242                 }
2243
2244                 if ( $this->mEnableClientCache ) {
2245                         if (
2246                                 $config->get( 'UseSquid' ) &&
2247                                 !$response->hasCookies() &&
2248                                 !SessionManager::getGlobalSession()->isPersistent() &&
2249                                 !$this->isPrintable() &&
2250                                 $this->mCdnMaxage != 0 &&
2251                                 !$this->haveCacheVaryCookies()
2252                         ) {
2253                                 if ( $config->get( 'UseESI' ) ) {
2254                                         # We'll purge the proxy cache explicitly, but require end user agents
2255                                         # to revalidate against the proxy on each visit.
2256                                         # Surrogate-Control controls our CDN, Cache-Control downstream caches
2257                                         wfDebug( __METHOD__ .
2258                                                 ": proxy caching with ESI; {$this->mLastModified} **", 'private' );
2259                                         # start with a shorter timeout for initial testing
2260                                         # header( 'Surrogate-Control: max-age=2678400+2678400, content="ESI/1.0"');
2261                                         $response->header(
2262                                                 "Surrogate-Control: max-age={$config->get( 'SquidMaxage' )}" .
2263                                                 "+{$this->mCdnMaxage}, content=\"ESI/1.0\""
2264                                         );
2265                                         $response->header( 'Cache-Control: s-maxage=0, must-revalidate, max-age=0' );
2266                                 } else {
2267                                         # We'll purge the proxy cache for anons explicitly, but require end user agents
2268                                         # to revalidate against the proxy on each visit.
2269                                         # IMPORTANT! The CDN needs to replace the Cache-Control header with
2270                                         # Cache-Control: s-maxage=0, must-revalidate, max-age=0
2271                                         wfDebug( __METHOD__ .
2272                                                 ": local proxy caching; {$this->mLastModified} **", 'private' );
2273                                         # start with a shorter timeout for initial testing
2274                                         # header( "Cache-Control: s-maxage=2678400, must-revalidate, max-age=0" );
2275                                         $response->header( "Cache-Control: " .
2276                                                 "s-maxage={$this->mCdnMaxage}, must-revalidate, max-age=0" );
2277                                 }
2278                         } else {
2279                                 # We do want clients to cache if they can, but they *must* check for updates
2280                                 # on revisiting the page.
2281                                 wfDebug( __METHOD__ . ": private caching; {$this->mLastModified} **", 'private' );
2282                                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
2283                                 $response->header( "Cache-Control: private, must-revalidate, max-age=0" );
2284                         }
2285                         if ( $this->mLastModified ) {
2286                                 $response->header( "Last-Modified: {$this->mLastModified}" );
2287                         }
2288                 } else {
2289                         wfDebug( __METHOD__ . ": no caching **", 'private' );
2290
2291                         # In general, the absence of a last modified header should be enough to prevent
2292                         # the client from using its cache. We send a few other things just to make sure.
2293                         $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
2294                         $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
2295                         $response->header( 'Pragma: no-cache' );
2296                 }
2297         }
2298
2299         /**
2300          * Finally, all the text has been munged and accumulated into
2301          * the object, let's actually output it:
2302          *
2303          * @param bool $return Set to true to get the result as a string rather than sending it
2304          * @return string|null
2305          * @throws Exception
2306          * @throws FatalError
2307          * @throws MWException
2308          */
2309         public function output( $return = false ) {
2310                 global $wgContLang;
2311
2312                 if ( $this->mDoNothing ) {
2313                         return $return ? '' : null;
2314                 }
2315
2316                 $response = $this->getRequest()->response();
2317                 $config = $this->getConfig();
2318
2319                 if ( $this->mRedirect != '' ) {
2320                         # Standards require redirect URLs to be absolute
2321                         $this->mRedirect = wfExpandUrl( $this->mRedirect, PROTO_CURRENT );
2322
2323                         $redirect = $this->mRedirect;
2324                         $code = $this->mRedirectCode;
2325
2326                         if ( Hooks::run( "BeforePageRedirect", [ $this, &$redirect, &$code ] ) ) {
2327                                 if ( $code == '301' || $code == '303' ) {
2328                                         if ( !$config->get( 'DebugRedirects' ) ) {
2329                                                 $response->statusHeader( $code );
2330                                         }
2331                                         $this->mLastModified = wfTimestamp( TS_RFC2822 );
2332                                 }
2333                                 if ( $config->get( 'VaryOnXFP' ) ) {
2334                                         $this->addVaryHeader( 'X-Forwarded-Proto' );
2335                                 }
2336                                 $this->sendCacheControl();
2337
2338                                 $response->header( "Content-Type: text/html; charset=utf-8" );
2339                                 if ( $config->get( 'DebugRedirects' ) ) {
2340                                         $url = htmlspecialchars( $redirect );
2341                                         print "<!DOCTYPE html>\n<html>\n<head>\n<title>Redirect</title>\n</head>\n<body>\n";
2342                                         print "<p>Location: <a href=\"$url\">$url</a></p>\n";
2343                                         print "</body>\n</html>\n";
2344                                 } else {
2345                                         $response->header( 'Location: ' . $redirect );
2346                                 }
2347                         }
2348
2349                         return $return ? '' : null;
2350                 } elseif ( $this->mStatusCode ) {
2351                         $response->statusHeader( $this->mStatusCode );
2352                 }
2353
2354                 # Buffer output; final headers may depend on later processing
2355                 ob_start();
2356
2357                 $response->header( 'Content-type: ' . $config->get( 'MimeType' ) . '; charset=UTF-8' );
2358                 $response->header( 'Content-language: ' . $wgContLang->getHtmlCode() );
2359
2360                 // Avoid Internet Explorer "compatibility view" in IE 8-10, so that
2361                 // jQuery etc. can work correctly.
2362                 $response->header( 'X-UA-Compatible: IE=Edge' );
2363
2364                 // Prevent framing, if requested
2365                 $frameOptions = $this->getFrameOptions();
2366                 if ( $frameOptions ) {
2367                         $response->header( "X-Frame-Options: $frameOptions" );
2368                 }
2369
2370                 if ( $this->mArticleBodyOnly ) {
2371                         echo $this->mBodytext;
2372                 } else {
2373                         $sk = $this->getSkin();
2374                         // add skin specific modules
2375                         $modules = $sk->getDefaultModules();
2376
2377                         // Enforce various default modules for all pages and all skins
2378                         $coreModules = [
2379                                 // Keep this list as small as possible
2380                                 'site',
2381                                 'mediawiki.page.startup',
2382                                 'mediawiki.user',
2383                         ];
2384
2385                         // Support for high-density display images if enabled
2386                         if ( $config->get( 'ResponsiveImages' ) ) {
2387                                 $coreModules[] = 'mediawiki.hidpi';
2388                         }
2389
2390                         $this->addModules( $coreModules );
2391                         foreach ( $modules as $group ) {
2392                                 $this->addModules( $group );
2393                         }
2394                         MWDebug::addModules( $this );
2395
2396                         // Avoid PHP 7.1 warning of passing $this by reference
2397                         $outputPage = $this;
2398                         // Hook that allows last minute changes to the output page, e.g.
2399                         // adding of CSS or Javascript by extensions.
2400                         Hooks::run( 'BeforePageDisplay', [ &$outputPage, &$sk ] );
2401
2402                         try {
2403                                 $sk->outputPage();
2404                         } catch ( Exception $e ) {
2405                                 ob_end_clean(); // bug T129657
2406                                 throw $e;
2407                         }
2408                 }
2409
2410                 try {
2411                         // This hook allows last minute changes to final overall output by modifying output buffer
2412                         Hooks::run( 'AfterFinalPageOutput', [ $this ] );
2413                 } catch ( Exception $e ) {
2414                         ob_end_clean(); // bug T129657
2415                         throw $e;
2416                 }
2417
2418                 $this->sendCacheControl();
2419
2420                 if ( $return ) {
2421                         return ob_get_clean();
2422                 } else {
2423                         ob_end_flush();
2424                         return null;
2425                 }
2426         }
2427
2428         /**
2429          * Prepare this object to display an error page; disable caching and
2430          * indexing, clear the current text and redirect, set the page's title
2431          * and optionally an custom HTML title (content of the "<title>" tag).
2432          *
2433          * @param string|Message $pageTitle Will be passed directly to setPageTitle()
2434          * @param string|Message $htmlTitle Will be passed directly to setHTMLTitle();
2435          *                   optional, if not passed the "<title>" attribute will be
2436          *                   based on $pageTitle
2437          */
2438         public function prepareErrorPage( $pageTitle, $htmlTitle = false ) {
2439                 $this->setPageTitle( $pageTitle );
2440                 if ( $htmlTitle !== false ) {
2441                         $this->setHTMLTitle( $htmlTitle );
2442                 }
2443                 $this->setRobotPolicy( 'noindex,nofollow' );
2444                 $this->setArticleRelated( false );
2445                 $this->enableClientCache( false );
2446                 $this->mRedirect = '';
2447                 $this->clearSubtitle();
2448                 $this->clearHTML();
2449         }
2450
2451         /**
2452          * Output a standard error page
2453          *
2454          * showErrorPage( 'titlemsg', 'pagetextmsg' );
2455          * showErrorPage( 'titlemsg', 'pagetextmsg', [ 'param1', 'param2' ] );
2456          * showErrorPage( 'titlemsg', $messageObject );
2457          * showErrorPage( $titleMessageObject, $messageObject );
2458          *
2459          * @param string|Message $title Message key (string) for page title, or a Message object
2460          * @param string|Message $msg Message key (string) for page text, or a Message object
2461          * @param array $params Message parameters; ignored if $msg is a Message object
2462          */
2463         public function showErrorPage( $title, $msg, $params = [] ) {
2464                 if ( !$title instanceof Message ) {
2465                         $title = $this->msg( $title );
2466                 }
2467
2468                 $this->prepareErrorPage( $title );
2469
2470                 if ( $msg instanceof Message ) {
2471                         if ( $params !== [] ) {
2472                                 trigger_error( 'Argument ignored: $params. The message parameters argument '
2473                                         . 'is discarded when the $msg argument is a Message object instead of '
2474                                         . 'a string.', E_USER_NOTICE );
2475                         }
2476                         $this->addHTML( $msg->parseAsBlock() );
2477                 } else {
2478                         $this->addWikiMsgArray( $msg, $params );
2479                 }
2480
2481                 $this->returnToMain();
2482         }
2483
2484         /**
2485          * Output a standard permission error page
2486          *
2487          * @param array $errors Error message keys or [key, param...] arrays
2488          * @param string $action Action that was denied or null if unknown
2489          */
2490         public function showPermissionsErrorPage( array $errors, $action = null ) {
2491                 foreach ( $errors as $key => $error ) {
2492                         $errors[$key] = (array)$error;
2493                 }
2494
2495                 // For some action (read, edit, create and upload), display a "login to do this action"
2496                 // error if all of the following conditions are met:
2497                 // 1. the user is not logged in
2498                 // 2. the only error is insufficient permissions (i.e. no block or something else)
2499                 // 3. the error can be avoided simply by logging in
2500                 if ( in_array( $action, [ 'read', 'edit', 'createpage', 'createtalk', 'upload' ] )
2501                         && $this->getUser()->isAnon() && count( $errors ) == 1 && isset( $errors[0][0] )
2502                         && ( $errors[0][0] == 'badaccess-groups' || $errors[0][0] == 'badaccess-group0' )
2503                         && ( User::groupHasPermission( 'user', $action )
2504                         || User::groupHasPermission( 'autoconfirmed', $action ) )
2505                 ) {
2506                         $displayReturnto = null;
2507
2508                         # Due to T34276, if a user does not have read permissions,
2509                         # $this->getTitle() will just give Special:Badtitle, which is
2510                         # not especially useful as a returnto parameter. Use the title
2511                         # from the request instead, if there was one.
2512                         $request = $this->getRequest();
2513                         $returnto = Title::newFromText( $request->getVal( 'title', '' ) );
2514                         if ( $action == 'edit' ) {
2515                                 $msg = 'whitelistedittext';
2516                                 $displayReturnto = $returnto;
2517                         } elseif ( $action == 'createpage' || $action == 'createtalk' ) {
2518                                 $msg = 'nocreatetext';
2519                         } elseif ( $action == 'upload' ) {
2520                                 $msg = 'uploadnologintext';
2521                         } else { # Read
2522                                 $msg = 'loginreqpagetext';
2523                                 $displayReturnto = Title::newMainPage();
2524                         }
2525
2526                         $query = [];
2527
2528                         if ( $returnto ) {
2529                                 $query['returnto'] = $returnto->getPrefixedText();
2530
2531                                 if ( !$request->wasPosted() ) {
2532                                         $returntoquery = $request->getValues();
2533                                         unset( $returntoquery['title'] );
2534                                         unset( $returntoquery['returnto'] );
2535                                         unset( $returntoquery['returntoquery'] );
2536                                         $query['returntoquery'] = wfArrayToCgi( $returntoquery );
2537                                 }
2538                         }
2539                         $linkRenderer = MediaWikiServices::getInstance()->getLinkRenderer();
2540                         $loginLink = $linkRenderer->makeKnownLink(
2541                                 SpecialPage::getTitleFor( 'Userlogin' ),
2542                                 $this->msg( 'loginreqlink' )->text(),
2543                                 [],
2544                                 $query
2545                         );
2546
2547                         $this->prepareErrorPage( $this->msg( 'loginreqtitle' ) );
2548                         $this->addHTML( $this->msg( $msg )->rawParams( $loginLink )->parse() );
2549
2550                         # Don't return to a page the user can't read otherwise
2551                         # we'll end up in a pointless loop
2552                         if ( $displayReturnto && $displayReturnto->userCan( 'read', $this->getUser() ) ) {
2553                                 $this->returnToMain( null, $displayReturnto );
2554                         }
2555                 } else {
2556                         $this->prepareErrorPage( $this->msg( 'permissionserrors' ) );
2557                         $this->addWikiText( $this->formatPermissionsErrorMessage( $errors, $action ) );
2558                 }
2559         }
2560
2561         /**
2562          * Display an error page indicating that a given version of MediaWiki is
2563          * required to use it
2564          *
2565          * @param mixed $version The version of MediaWiki needed to use the page
2566          */
2567         public function versionRequired( $version ) {
2568                 $this->prepareErrorPage( $this->msg( 'versionrequired', $version ) );
2569
2570                 $this->addWikiMsg( 'versionrequiredtext', $version );
2571                 $this->returnToMain();
2572         }
2573
2574         /**
2575          * Format a list of error messages
2576          *
2577          * @param array $errors Array of arrays returned by Title::getUserPermissionsErrors
2578          * @param string $action Action that was denied or null if unknown
2579          * @return string The wikitext error-messages, formatted into a list.
2580          */
2581         public function formatPermissionsErrorMessage( array $errors, $action = null ) {
2582                 if ( $action == null ) {
2583                         $text = $this->msg( 'permissionserrorstext', count( $errors ) )->plain() . "\n\n";
2584                 } else {
2585                         $action_desc = $this->msg( "action-$action" )->plain();
2586                         $text = $this->msg(
2587                                 'permissionserrorstext-withaction',
2588                                 count( $errors ),
2589                                 $action_desc
2590                         )->plain() . "\n\n";
2591                 }
2592
2593                 if ( count( $errors ) > 1 ) {
2594                         $text .= '<ul class="permissions-errors">' . "\n";
2595
2596                         foreach ( $errors as $error ) {
2597                                 $text .= '<li>';
2598                                 $text .= call_user_func_array( [ $this, 'msg' ], $error )->plain();
2599                                 $text .= "</li>\n";
2600                         }
2601                         $text .= '</ul>';
2602                 } else {
2603                         $text .= "<div class=\"permissions-errors\">\n" .
2604                                         call_user_func_array( [ $this, 'msg' ], reset( $errors ) )->plain() .
2605                                         "\n</div>";
2606                 }
2607
2608                 return $text;
2609         }
2610
2611         /**
2612          * Display a page stating that the Wiki is in read-only mode.
2613          * Should only be called after wfReadOnly() has returned true.
2614          *
2615          * Historically, this function was used to show the source of the page that the user
2616          * was trying to edit and _also_ permissions error messages. The relevant code was
2617          * moved into EditPage in 1.19 (r102024 / d83c2a431c2a) and removed here in 1.25.
2618          *
2619          * @deprecated since 1.25; throw the exception directly
2620          * @throws ReadOnlyError
2621          */
2622         public function readOnlyPage() {
2623                 if ( func_num_args() > 0 ) {
2624                         throw new MWException( __METHOD__ . ' no longer accepts arguments since 1.25.' );
2625                 }
2626
2627                 throw new ReadOnlyError;
2628         }
2629
2630         /**
2631          * Turn off regular page output and return an error response
2632          * for when rate limiting has triggered.
2633          *
2634          * @deprecated since 1.25; throw the exception directly
2635          */
2636         public function rateLimited() {
2637                 wfDeprecated( __METHOD__, '1.25' );
2638                 throw new ThrottledError;
2639         }
2640
2641         /**
2642          * Show a warning about replica DB lag
2643          *
2644          * If the lag is higher than $wgSlaveLagCritical seconds,
2645          * then the warning is a bit more obvious. If the lag is
2646          * lower than $wgSlaveLagWarning, then no warning is shown.
2647          *
2648          * @param int $lag Slave lag
2649          */
2650         public function showLagWarning( $lag ) {
2651                 $config = $this->getConfig();
2652                 if ( $lag >= $config->get( 'SlaveLagWarning' ) ) {
2653                         $lag = floor( $lag ); // floor to avoid nano seconds to display
2654                         $message = $lag < $config->get( 'SlaveLagCritical' )
2655                                 ? 'lag-warn-normal'
2656                                 : 'lag-warn-high';
2657                         $wrap = Html::rawElement( 'div', [ 'class' => "mw-{$message}" ], "\n$1\n" );
2658                         $this->wrapWikiMsg( "$wrap\n", [ $message, $this->getLanguage()->formatNum( $lag ) ] );
2659                 }
2660         }
2661
2662         public function showFatalError( $message ) {
2663                 $this->prepareErrorPage( $this->msg( 'internalerror' ) );
2664
2665                 $this->addHTML( $message );
2666         }
2667
2668         public function showUnexpectedValueError( $name, $val ) {
2669                 $this->showFatalError( $this->msg( 'unexpected', $name, $val )->text() );
2670         }
2671
2672         public function showFileCopyError( $old, $new ) {
2673                 $this->showFatalError( $this->msg( 'filecopyerror', $old, $new )->text() );
2674         }
2675
2676         public function showFileRenameError( $old, $new ) {
2677                 $this->showFatalError( $this->msg( 'filerenameerror', $old, $new )->text() );
2678         }
2679
2680         public function showFileDeleteError( $name ) {
2681                 $this->showFatalError( $this->msg( 'filedeleteerror', $name )->text() );
2682         }
2683
2684         public function showFileNotFoundError( $name ) {
2685                 $this->showFatalError( $this->msg( 'filenotfound', $name )->text() );
2686         }
2687
2688         /**
2689          * Add a "return to" link pointing to a specified title
2690          *
2691          * @param Title $title Title to link
2692          * @param array $query Query string parameters
2693          * @param string $text Text of the link (input is not escaped)
2694          * @param array $options Options array to pass to Linker
2695          */
2696         public function addReturnTo( $title, array $query = [], $text = null, $options = [] ) {
2697                 $linkRenderer = MediaWikiServices::getInstance()
2698                         ->getLinkRendererFactory()->createFromLegacyOptions( $options );
2699                 $link = $this->msg( 'returnto' )->rawParams(
2700                         $linkRenderer->makeLink( $title, $text, [], $query ) )->escaped();
2701                 $this->addHTML( "<p id=\"mw-returnto\">{$link}</p>\n" );
2702         }
2703
2704         /**
2705          * Add a "return to" link pointing to a specified title,
2706          * or the title indicated in the request, or else the main page
2707          *
2708          * @param mixed $unused
2709          * @param Title|string $returnto Title or String to return to
2710          * @param string $returntoquery Query string for the return to link
2711          */
2712         public function returnToMain( $unused = null, $returnto = null, $returntoquery = null ) {
2713                 if ( $returnto == null ) {
2714                         $returnto = $this->getRequest()->getText( 'returnto' );
2715                 }
2716
2717                 if ( $returntoquery == null ) {
2718                         $returntoquery = $this->getRequest()->getText( 'returntoquery' );
2719                 }
2720
2721                 if ( $returnto === '' ) {
2722                         $returnto = Title::newMainPage();
2723                 }
2724
2725                 if ( is_object( $returnto ) ) {
2726                         $titleObj = $returnto;
2727                 } else {
2728                         $titleObj = Title::newFromText( $returnto );
2729                 }
2730                 if ( !is_object( $titleObj ) ) {
2731                         $titleObj = Title::newMainPage();
2732                 }
2733
2734                 $this->addReturnTo( $titleObj, wfCgiToArray( $returntoquery ) );
2735         }
2736
2737         private function getRlClientContext() {
2738                 if ( !$this->rlClientContext ) {
2739                         $query = ResourceLoader::makeLoaderQuery(
2740                                 [], // modules; not relevant
2741                                 $this->getLanguage()->getCode(),
2742                                 $this->getSkin()->getSkinName(),
2743                                 $this->getUser()->isLoggedIn() ? $this->getUser()->getName() : null,
2744                                 null, // version; not relevant
2745                                 ResourceLoader::inDebugMode(),
2746                                 null, // only; not relevant
2747                                 $this->isPrintable(),
2748                                 $this->getRequest()->getBool( 'handheld' )
2749                         );
2750                         $this->rlClientContext = new ResourceLoaderContext(
2751                                 $this->getResourceLoader(),
2752                                 new FauxRequest( $query )
2753                         );
2754                 }
2755                 return $this->rlClientContext;
2756         }
2757
2758         /**
2759          * Call this to freeze the module queue and JS config and create a formatter.
2760          *
2761          * Depending on the Skin, this may get lazy-initialised in either headElement() or
2762          * getBottomScripts(). See SkinTemplate::prepareQuickTemplate(). Calling this too early may
2763          * cause unexpected side-effects since disallowUserJs() may be called at any time to change
2764          * the module filters retroactively. Skins and extension hooks may also add modules until very
2765          * late in the request lifecycle.
2766          *
2767          * @return ResourceLoaderClientHtml
2768          */
2769         public function getRlClient() {
2770                 if ( !$this->rlClient ) {
2771                         $context = $this->getRlClientContext();
2772                         $rl = $this->getResourceLoader();
2773                         $this->addModules( [
2774                                 'user.options',
2775                                 'user.tokens',
2776                         ] );
2777                         $this->addModuleStyles( [
2778                                 'site.styles',
2779                                 'noscript',
2780                                 'user.styles',
2781                         ] );
2782                         $this->getSkin()->setupSkinUserCss( $this );
2783
2784                         // Prepare exempt modules for buildExemptModules()
2785                         $exemptGroups = [ 'site' => [], 'noscript' => [], 'private' => [], 'user' => [] ];
2786                         $exemptStates = [];
2787                         $moduleStyles = $this->getModuleStyles( /*filter*/ true );
2788
2789                         // Preload getTitleInfo for isKnownEmpty calls below and in ResourceLoaderClientHtml
2790                         // Separate user-specific batch for improved cache-hit ratio.
2791                         $userBatch = [ 'user.styles', 'user' ];
2792                         $siteBatch = array_diff( $moduleStyles, $userBatch );
2793                         $dbr = wfGetDB( DB_REPLICA );
2794                         ResourceLoaderWikiModule::preloadTitleInfo( $context, $dbr, $siteBatch );
2795                         ResourceLoaderWikiModule::preloadTitleInfo( $context, $dbr, $userBatch );
2796
2797                         // Filter out modules handled by buildExemptModules()
2798                         $moduleStyles = array_filter( $moduleStyles,
2799                                 function ( $name ) use ( $rl, $context, &$exemptGroups, &$exemptStates ) {
2800                                         $module = $rl->getModule( $name );
2801                                         if ( $module ) {
2802                                                 if ( $name === 'user.styles' && $this->isUserCssPreview() ) {
2803                                                         $exemptStates[$name] = 'ready';
2804                                                         // Special case in buildExemptModules()
2805                                                         return false;
2806                                                 }
2807                                                 $group = $module->getGroup();
2808                                                 if ( isset( $exemptGroups[$group] ) ) {
2809                                                         $exemptStates[$name] = 'ready';
2810                                                         if ( !$module->isKnownEmpty( $context ) ) {
2811                                                                 // E.g. Don't output empty <styles>
2812                                                                 $exemptGroups[$group][] = $name;
2813                                                         }
2814                                                         return false;
2815                                                 }
2816                                         }
2817                                         return true;
2818                                 }
2819                         );
2820                         $this->rlExemptStyleModules = $exemptGroups;
2821
2822                         $isUserModuleFiltered = !$this->filterModules( [ 'user' ] );
2823                         // If this page filters out 'user', makeResourceLoaderLink will drop it.
2824                         // Avoid indefinite "loading" state or untrue "ready" state (T145368).
2825                         if ( !$isUserModuleFiltered ) {
2826                                 // Manually handled by getBottomScripts()
2827                                 $userModule = $rl->getModule( 'user' );
2828                                 $userState = $userModule->isKnownEmpty( $context ) && !$this->isUserJsPreview()
2829                                         ? 'ready'
2830                                         : 'loading';
2831                                 $this->rlUserModuleState = $exemptStates['user'] = $userState;
2832                         }
2833
2834                         $rlClient = new ResourceLoaderClientHtml( $context, $this->getTarget() );
2835                         $rlClient->setConfig( $this->getJSVars() );
2836                         $rlClient->setModules( $this->getModules( /*filter*/ true ) );
2837                         $rlClient->setModuleStyles( $moduleStyles );
2838                         $rlClient->setModuleScripts( $this->getModuleScripts( /*filter*/ true ) );
2839                         $rlClient->setExemptStates( $exemptStates );
2840                         $this->rlClient = $rlClient;
2841                 }
2842                 return $this->rlClient;
2843         }
2844
2845         /**
2846          * @param Skin $sk The given Skin
2847          * @param bool $includeStyle Unused
2848          * @return string The doctype, opening "<html>", and head element.
2849          */
2850         public function headElement( Skin $sk, $includeStyle = true ) {
2851                 global $wgContLang;
2852
2853                 $userdir = $this->getLanguage()->getDir();
2854                 $sitedir = $wgContLang->getDir();
2855
2856                 $pieces = [];
2857                 $pieces[] = Html::htmlHeader( Sanitizer::mergeAttributes(
2858                         $this->getRlClient()->getDocumentAttributes(),
2859                         $sk->getHtmlElementAttributes()
2860                 ) );
2861                 $pieces[] = Html::openElement( 'head' );
2862
2863                 if ( $this->getHTMLTitle() == '' ) {
2864                         $this->setHTMLTitle( $this->msg( 'pagetitle', $this->getPageTitle() )->inContentLanguage() );
2865                 }
2866
2867                 if ( !Html::isXmlMimeType( $this->getConfig()->get( 'MimeType' ) ) ) {
2868                         // Add <meta charset="UTF-8">
2869                         // This should be before <title> since it defines the charset used by
2870                         // text including the text inside <title>.
2871                         // The spec recommends defining XHTML5's charset using the XML declaration
2872                         // instead of meta.
2873                         // Our XML declaration is output by Html::htmlHeader.
2874                         // https://html.spec.whatwg.org/multipage/semantics.html#attr-meta-http-equiv-content-type
2875                         // https://html.spec.whatwg.org/multipage/semantics.html#charset
2876                         $pieces[] = Html::element( 'meta', [ 'charset' => 'UTF-8' ] );
2877                 }
2878
2879                 $pieces[] = Html::element( 'title', null, $this->getHTMLTitle() );
2880                 $pieces[] = $this->getRlClient()->getHeadHtml();
2881                 $pieces[] = $this->buildExemptModules();
2882                 $pieces = array_merge( $pieces, array_values( $this->getHeadLinksArray() ) );
2883                 $pieces = array_merge( $pieces, array_values( $this->mHeadItems ) );
2884                 $pieces[] = Html::closeElement( 'head' );
2885
2886                 $bodyClasses = [];
2887                 $bodyClasses[] = 'mediawiki';
2888
2889                 # Classes for LTR/RTL directionality support
2890                 $bodyClasses[] = $userdir;
2891                 $bodyClasses[] = "sitedir-$sitedir";
2892
2893                 $underline = $this->getUser()->getOption( 'underline' );
2894                 if ( $underline < 2 ) {
2895                         // The following classes can be used here:
2896                         // * mw-underline-always
2897                         // * mw-underline-never
2898                         $bodyClasses[] = 'mw-underline-' . ( $underline ? 'always' : 'never' );
2899                 }
2900
2901                 if ( $this->getLanguage()->capitalizeAllNouns() ) {
2902                         # A <body> class is probably not the best way to do this . . .
2903                         $bodyClasses[] = 'capitalize-all-nouns';
2904                 }
2905
2906                 // Parser feature migration class
2907                 // The idea is that this will eventually be removed, after the wikitext
2908                 // which requires it is cleaned up.
2909                 $bodyClasses[] = 'mw-hide-empty-elt';
2910
2911                 $bodyClasses[] = $sk->getPageClasses( $this->getTitle() );
2912                 $bodyClasses[] = 'skin-' . Sanitizer::escapeClass( $sk->getSkinName() );
2913                 $bodyClasses[] =
2914                         'action-' . Sanitizer::escapeClass( Action::getActionName( $this->getContext() ) );
2915
2916                 $bodyAttrs = [];
2917                 // While the implode() is not strictly needed, it's used for backwards compatibility
2918                 // (this used to be built as a string and hooks likely still expect that).
2919                 $bodyAttrs['class'] = implode( ' ', $bodyClasses );
2920
2921                 // Allow skins and extensions to add body attributes they need
2922                 $sk->addToBodyAttributes( $this, $bodyAttrs );
2923                 Hooks::run( 'OutputPageBodyAttributes', [ $this, $sk, &$bodyAttrs ] );
2924
2925                 $pieces[] = Html::openElement( 'body', $bodyAttrs );
2926
2927                 return self::combineWrappedStrings( $pieces );
2928         }
2929
2930         /**
2931          * Get a ResourceLoader object associated with this OutputPage
2932          *
2933          * @return ResourceLoader
2934          */
2935         public function getResourceLoader() {
2936                 if ( is_null( $this->mResourceLoader ) ) {
2937                         $this->mResourceLoader = new ResourceLoader(
2938                                 $this->getConfig(),
2939                                 LoggerFactory::getInstance( 'resourceloader' )
2940                         );
2941                 }
2942                 return $this->mResourceLoader;
2943         }
2944
2945         /**
2946          * Explicily load or embed modules on a page.
2947          *
2948          * @param array|string $modules One or more module names
2949          * @param string $only ResourceLoaderModule TYPE_ class constant
2950          * @param array $extraQuery [optional] Array with extra query parameters for the request
2951          * @return string|WrappedStringList HTML
2952          */
2953         public function makeResourceLoaderLink( $modules, $only, array $extraQuery = [] ) {
2954                 // Apply 'target' and 'origin' filters
2955                 $modules = $this->filterModules( (array)$modules, null, $only );
2956
2957                 return ResourceLoaderClientHtml::makeLoad(
2958                         $this->getRlClientContext(),
2959                         $modules,
2960                         $only,
2961                         $extraQuery
2962                 );
2963         }
2964
2965         /**
2966          * Combine WrappedString chunks and filter out empty ones
2967          *
2968          * @param array $chunks
2969          * @return string|WrappedStringList HTML
2970          */
2971         protected static function combineWrappedStrings( array $chunks ) {
2972                 // Filter out empty values
2973                 $chunks = array_filter( $chunks, 'strlen' );
2974                 return WrappedString::join( "\n", $chunks );
2975         }
2976
2977         private function isUserJsPreview() {
2978                 return $this->getConfig()->get( 'AllowUserJs' )
2979                         && $this->getTitle()
2980                         && $this->getTitle()->isJsSubpage()
2981                         && $this->userCanPreview();
2982         }
2983
2984         private function isUserCssPreview() {
2985                 return $this->getConfig()->get( 'AllowUserCss' )
2986                         && $this->getTitle()
2987                         && $this->getTitle()->isCssSubpage()
2988                         && $this->userCanPreview();
2989         }
2990
2991         /**
2992          * JS stuff to put at the bottom of the `<body>`. These are modules with position 'bottom',
2993          * legacy scripts ($this->mScripts), and user JS.
2994          *
2995          * @return string|WrappedStringList HTML
2996          */
2997         public function getBottomScripts() {
2998                 $chunks = [];
2999                 $chunks[] = $this->getRlClient()->getBodyHtml();
3000
3001                 // Legacy non-ResourceLoader scripts
3002                 $chunks[] = $this->mScripts;
3003
3004                 // Exempt 'user' module
3005                 // - May need excludepages for live preview. (T28283)
3006                 // - Must use TYPE_COMBINED so its response is handled by mw.loader.implement() which
3007                 //   ensures execution is scheduled after the "site" module.
3008                 // - Don't load if module state is already resolved as "ready".
3009                 if ( $this->rlUserModuleState === 'loading' ) {
3010                         if ( $this->isUserJsPreview() ) {
3011                                 $chunks[] = $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_COMBINED,
3012                                         [ 'excludepage' => $this->getTitle()->getPrefixedDBkey() ]
3013                                 );
3014                                 $chunks[] = ResourceLoader::makeInlineScript(
3015                                         Xml::encodeJsCall( 'mw.loader.using', [
3016                                                 [ 'user', 'site' ],
3017                                                 new XmlJsCode(
3018                                                         'function () {'
3019                                                                 . Xml::encodeJsCall( '$.globalEval', [
3020                                                                         $this->getRequest()->getText( 'wpTextbox1' )
3021                                                                 ] )
3022                                                                 . '}'
3023                                                 )
3024                                         ] )
3025                                 );
3026                                 // FIXME: If the user is previewing, say, ./vector.js, his ./common.js will be loaded
3027                                 // asynchronously and may arrive *after* the inline script here. So the previewed code
3028                                 // may execute before ./common.js runs. Normally, ./common.js runs before ./vector.js.
3029                                 // Similarly, when previewing ./common.js and the user module does arrive first,
3030                                 // it will arrive without common.js and the inline script runs after.
3031                                 // Thus running common after the excluded subpage.
3032                         } else {
3033                                 // Load normally
3034                                 $chunks[] = $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_COMBINED );
3035                         }
3036                 }
3037
3038                 if ( $this->limitReportJSData ) {
3039                         $chunks[] = ResourceLoader::makeInlineScript(
3040                                 ResourceLoader::makeConfigSetScript(
3041                                         [ 'wgPageParseReport' => $this->limitReportJSData ]
3042                                 )
3043                         );
3044                 }
3045
3046                 return self::combineWrappedStrings( $chunks );
3047         }
3048
3049         /**
3050          * Get the javascript config vars to include on this page
3051          *
3052          * @return array Array of javascript config vars
3053          * @since 1.23
3054          */
3055         public function getJsConfigVars() {
3056                 return $this->mJsConfigVars;
3057         }
3058
3059         /**
3060          * Add one or more variables to be set in mw.config in JavaScript
3061          *
3062          * @param string|array $keys Key or array of key/value pairs
3063          * @param mixed $value [optional] Value of the configuration variable
3064          */
3065         public function addJsConfigVars( $keys, $value = null ) {
3066                 if ( is_array( $keys ) ) {
3067                         foreach ( $keys as $key => $value ) {
3068                                 $this->mJsConfigVars[$key] = $value;
3069                         }
3070                         return;
3071                 }
3072
3073                 $this->mJsConfigVars[$keys] = $value;
3074         }
3075
3076         /**
3077          * Get an array containing the variables to be set in mw.config in JavaScript.
3078          *
3079          * Do not add things here which can be evaluated in ResourceLoaderStartUpModule
3080          * - in other words, page-independent/site-wide variables (without state).
3081          * You will only be adding bloat to the html page and causing page caches to
3082          * have to be purged on configuration changes.
3083          * @return array
3084          */
3085         public function getJSVars() {
3086                 global $wgContLang;
3087
3088                 $curRevisionId = 0;
3089                 $articleId = 0;
3090                 $canonicalSpecialPageName = false; # T23115
3091
3092                 $title = $this->getTitle();
3093                 $ns = $title->getNamespace();
3094                 $canonicalNamespace = MWNamespace::exists( $ns )
3095                         ? MWNamespace::getCanonicalName( $ns )
3096                         : $title->getNsText();
3097
3098                 $sk = $this->getSkin();
3099                 // Get the relevant title so that AJAX features can use the correct page name
3100                 // when making API requests from certain special pages (T36972).
3101                 $relevantTitle = $sk->getRelevantTitle();
3102                 $relevantUser = $sk->getRelevantUser();
3103
3104                 if ( $ns == NS_SPECIAL ) {
3105                         list( $canonicalSpecialPageName, /*...*/ ) =
3106                                 SpecialPageFactory::resolveAlias( $title->getDBkey() );
3107                 } elseif ( $this->canUseWikiPage() ) {
3108                         $wikiPage = $this->getWikiPage();
3109                         $curRevisionId = $wikiPage->getLatest();
3110                         $articleId = $wikiPage->getId();
3111                 }
3112
3113                 $lang = $title->getPageViewLanguage();
3114
3115                 // Pre-process information
3116                 $separatorTransTable = $lang->separatorTransformTable();
3117                 $separatorTransTable = $separatorTransTable ? $separatorTransTable : [];
3118                 $compactSeparatorTransTable = [
3119                         implode( "\t", array_keys( $separatorTransTable ) ),
3120                         implode( "\t", $separatorTransTable ),
3121                 ];
3122                 $digitTransTable = $lang->digitTransformTable();
3123                 $digitTransTable = $digitTransTable ? $digitTransTable : [];
3124                 $compactDigitTransTable = [
3125                         implode( "\t", array_keys( $digitTransTable ) ),
3126                         implode( "\t", $digitTransTable ),
3127                 ];
3128
3129                 $user = $this->getUser();
3130
3131                 $vars = [
3132                         'wgCanonicalNamespace' => $canonicalNamespace,
3133                         'wgCanonicalSpecialPageName' => $canonicalSpecialPageName,
3134                         'wgNamespaceNumber' => $title->getNamespace(),
3135                         'wgPageName' => $title->getPrefixedDBkey(),
3136                         'wgTitle' => $title->getText(),
3137                         'wgCurRevisionId' => $curRevisionId,
3138                         'wgRevisionId' => (int)$this->getRevisionId(),
3139                         'wgArticleId' => $articleId,
3140                         'wgIsArticle' => $this->isArticle(),
3141                         'wgIsRedirect' => $title->isRedirect(),
3142                         'wgAction' => Action::getActionName( $this->getContext() ),
3143                         'wgUserName' => $user->isAnon() ? null : $user->getName(),
3144                         'wgUserGroups' => $user->getEffectiveGroups(),
3145                         'wgCategories' => $this->getCategories(),
3146                         'wgBreakFrames' => $this->getFrameOptions() == 'DENY',
3147                         'wgPageContentLanguage' => $lang->getCode(),
3148                         'wgPageContentModel' => $title->getContentModel(),
3149                         'wgSeparatorTransformTable' => $compactSeparatorTransTable,
3150                         'wgDigitTransformTable' => $compactDigitTransTable,
3151                         'wgDefaultDateFormat' => $lang->getDefaultDateFormat(),
3152                         'wgMonthNames' => $lang->getMonthNamesArray(),
3153                         'wgMonthNamesShort' => $lang->getMonthAbbreviationsArray(),
3154                         'wgRelevantPageName' => $relevantTitle->getPrefixedDBkey(),
3155                         'wgRelevantArticleId' => $relevantTitle->getArticleID(),
3156                         'wgRequestId' => WebRequest::getRequestId(),
3157                 ];
3158
3159                 if ( $user->isLoggedIn() ) {
3160                         $vars['wgUserId'] = $user->getId();
3161                         $vars['wgUserEditCount'] = $user->getEditCount();
3162                         $userReg = $user->getRegistration();
3163                         $vars['wgUserRegistration'] = $userReg ? wfTimestamp( TS_UNIX, $userReg ) * 1000 : null;
3164                         // Get the revision ID of the oldest new message on the user's talk
3165                         // page. This can be used for constructing new message alerts on
3166                         // the client side.
3167                         $vars['wgUserNewMsgRevisionId'] = $user->getNewMessageRevisionId();
3168                 }
3169
3170                 if ( $wgContLang->hasVariants() ) {
3171                         $vars['wgUserVariant'] = $wgContLang->getPreferredVariant();
3172                 }
3173                 // Same test as SkinTemplate
3174                 $vars['wgIsProbablyEditable'] = $title->quickUserCan( 'edit', $user )
3175                         && ( $title->exists() || $title->quickUserCan( 'create', $user ) );
3176
3177                 foreach ( $title->getRestrictionTypes() as $type ) {
3178                         $vars['wgRestriction' . ucfirst( $type )] = $title->getRestrictions( $type );
3179                 }
3180
3181                 if ( $title->isMainPage() ) {
3182                         $vars['wgIsMainPage'] = true;
3183                 }
3184
3185                 if ( $this->mRedirectedFrom ) {
3186                         $vars['wgRedirectedFrom'] = $this->mRedirectedFrom->getPrefixedDBkey();
3187                 }
3188
3189                 if ( $relevantUser ) {
3190                         $vars['wgRelevantUserName'] = $relevantUser->getName();
3191                 }
3192
3193                 // Allow extensions to add their custom variables to the mw.config map.
3194                 // Use the 'ResourceLoaderGetConfigVars' hook if the variable is not
3195                 // page-dependant but site-wide (without state).
3196                 // Alternatively, you may want to use OutputPage->addJsConfigVars() instead.
3197                 Hooks::run( 'MakeGlobalVariablesScript', [ &$vars, $this ] );
3198
3199                 // Merge in variables from addJsConfigVars last
3200                 return array_merge( $vars, $this->getJsConfigVars() );
3201         }
3202
3203         /**
3204          * To make it harder for someone to slip a user a fake
3205          * user-JavaScript or user-CSS preview, a random token
3206          * is associated with the login session. If it's not
3207          * passed back with the preview request, we won't render
3208          * the code.
3209          *
3210          * @return bool
3211          */
3212         public function userCanPreview() {
3213                 $request = $this->getRequest();
3214                 if (
3215                         $request->getVal( 'action' ) !== 'submit' ||
3216                         !$request->getCheck( 'wpPreview' ) ||
3217                         !$request->wasPosted()
3218                 ) {
3219                         return false;
3220                 }
3221
3222                 $user = $this->getUser();
3223
3224                 if ( !$user->isLoggedIn() ) {
3225                         // Anons have predictable edit tokens
3226                         return false;
3227                 }
3228                 if ( !$user->matchEditToken( $request->getVal( 'wpEditToken' ) ) ) {
3229                         return false;
3230                 }
3231
3232                 $title = $this->getTitle();
3233                 if ( !$title->isJsSubpage() && !$title->isCssSubpage() ) {
3234                         return false;
3235                 }
3236                 if ( !$title->isSubpageOf( $user->getUserPage() ) ) {
3237                         // Don't execute another user's CSS or JS on preview (T85855)
3238                         return false;
3239                 }
3240
3241                 $errors = $title->getUserPermissionsErrors( 'edit', $user );
3242                 if ( count( $errors ) !== 0 ) {
3243                         return false;
3244                 }
3245
3246                 return true;
3247         }
3248
3249         /**
3250          * @return array Array in format "link name or number => 'link html'".
3251          */
3252         public function getHeadLinksArray() {
3253                 global $wgVersion;
3254
3255                 $tags = [];
3256                 $config = $this->getConfig();
3257
3258                 $canonicalUrl = $this->mCanonicalUrl;
3259
3260                 $tags['meta-generator'] = Html::element( 'meta', [
3261                         'name' => 'generator',
3262                         'content' => "MediaWiki $wgVersion",
3263                 ] );
3264
3265                 if ( $config->get( 'ReferrerPolicy' ) !== false ) {
3266                         $tags['meta-referrer'] = Html::element( 'meta', [
3267                                 'name' => 'referrer',
3268                                 'content' => $config->get( 'ReferrerPolicy' )
3269                         ] );
3270                 }
3271
3272                 $p = "{$this->mIndexPolicy},{$this->mFollowPolicy}";
3273                 if ( $p !== 'index,follow' ) {
3274                         // http://www.robotstxt.org/wc/meta-user.html
3275                         // Only show if it's different from the default robots policy
3276                         $tags['meta-robots'] = Html::element( 'meta', [
3277                                 'name' => 'robots',
3278                                 'content' => $p,
3279                         ] );
3280                 }
3281
3282                 foreach ( $this->mMetatags as $tag ) {
3283                         if ( strncasecmp( $tag[0], 'http:', 5 ) === 0 ) {
3284                                 $a = 'http-equiv';
3285                                 $tag[0] = substr( $tag[0], 5 );
3286                         } elseif ( strncasecmp( $tag[0], 'og:', 3 ) === 0 ) {
3287                                 $a = 'property';
3288                         } else {
3289                                 $a = 'name';
3290                         }
3291                         $tagName = "meta-{$tag[0]}";
3292                         if ( isset( $tags[$tagName] ) ) {
3293                                 $tagName .= $tag[1];
3294                         }
3295                         $tags[$tagName] = Html::element( 'meta',
3296                                 [
3297                                         $a => $tag[0],
3298                                         'content' => $tag[1]
3299                                 ]
3300                         );
3301                 }
3302
3303                 foreach ( $this->mLinktags as $tag ) {
3304                         $tags[] = Html::element( 'link', $tag );
3305                 }
3306
3307                 # Universal edit button
3308                 if ( $config->get( 'UniversalEditButton' ) && $this->isArticleRelated() ) {
3309                         $user = $this->getUser();
3310                         if ( $this->getTitle()->quickUserCan( 'edit', $user )
3311                                 && ( $this->getTitle()->exists() ||
3312                                         $this->getTitle()->quickUserCan( 'create', $user ) )
3313                         ) {
3314                                 // Original UniversalEditButton
3315                                 $msg = $this->msg( 'edit' )->text();
3316                                 $tags['universal-edit-button'] = Html::element( 'link', [
3317                                         'rel' => 'alternate',
3318                                         'type' => 'application/x-wiki',
3319                                         'title' => $msg,
3320                                         'href' => $this->getTitle()->getEditURL(),
3321                                 ] );
3322                                 // Alternate edit link
3323                                 $tags['alternative-edit'] = Html::element( 'link', [
3324                                         'rel' => 'edit',
3325                                         'title' => $msg,
3326                                         'href' => $this->getTitle()->getEditURL(),
3327                                 ] );
3328                         }
3329                 }
3330
3331                 # Generally the order of the favicon and apple-touch-icon links
3332                 # should not matter, but Konqueror (3.5.9 at least) incorrectly
3333                 # uses whichever one appears later in the HTML source. Make sure
3334                 # apple-touch-icon is specified first to avoid this.
3335                 if ( $config->get( 'AppleTouchIcon' ) !== false ) {
3336                         $tags['apple-touch-icon'] = Html::element( 'link', [
3337                                 'rel' => 'apple-touch-icon',
3338                                 'href' => $config->get( 'AppleTouchIcon' )
3339                         ] );
3340                 }
3341
3342                 if ( $config->get( 'Favicon' ) !== false ) {
3343                         $tags['favicon'] = Html::element( 'link', [
3344                                 'rel' => 'shortcut icon',
3345                                 'href' => $config->get( 'Favicon' )
3346                         ] );
3347                 }
3348
3349                 # OpenSearch description link
3350                 $tags['opensearch'] = Html::element( 'link', [
3351                         'rel' => 'search',
3352                         'type' => 'application/opensearchdescription+xml',
3353                         'href' => wfScript( 'opensearch_desc' ),
3354                         'title' => $this->msg( 'opensearch-desc' )->inContentLanguage()->text(),
3355                 ] );
3356
3357                 if ( $config->get( 'EnableAPI' ) ) {
3358                         # Real Simple Discovery link, provides auto-discovery information
3359                         # for the MediaWiki API (and potentially additional custom API
3360                         # support such as WordPress or Twitter-compatible APIs for a
3361                         # blogging extension, etc)
3362                         $tags['rsd'] = Html::element( 'link', [
3363                                 'rel' => 'EditURI',
3364                                 'type' => 'application/rsd+xml',
3365                                 // Output a protocol-relative URL here if $wgServer is protocol-relative.
3366                                 // Whether RSD accepts relative or protocol-relative URLs is completely
3367                                 // undocumented, though.
3368                                 'href' => wfExpandUrl( wfAppendQuery(
3369                                         wfScript( 'api' ),
3370                                         [ 'action' => 'rsd' ] ),
3371                                         PROTO_RELATIVE
3372                                 ),
3373                         ] );
3374                 }
3375
3376                 # Language variants
3377                 if ( !$config->get( 'DisableLangConversion' ) ) {
3378                         $lang = $this->getTitle()->getPageLanguage();
3379                         if ( $lang->hasVariants() ) {
3380                                 $variants = $lang->getVariants();
3381                                 foreach ( $variants as $variant ) {
3382                                         $tags["variant-$variant"] = Html::element( 'link', [
3383                                                 'rel' => 'alternate',
3384                                                 'hreflang' => wfBCP47( $variant ),
3385                                                 'href' => $this->getTitle()->getLocalURL(
3386                                                         [ 'variant' => $variant ] )
3387                                                 ]
3388                                         );
3389                                 }
3390                                 # x-default link per https://support.google.com/webmasters/answer/189077?hl=en
3391                                 $tags["variant-x-default"] = Html::element( 'link', [
3392                                         'rel' => 'alternate',
3393                                         'hreflang' => 'x-default',
3394                                         'href' => $this->getTitle()->getLocalURL() ] );
3395                         }
3396                 }
3397
3398                 # Copyright
3399                 if ( $this->copyrightUrl !== null ) {
3400                         $copyright = $this->copyrightUrl;
3401                 } else {
3402                         $copyright = '';
3403                         if ( $config->get( 'RightsPage' ) ) {
3404                                 $copy = Title::newFromText( $config->get( 'RightsPage' ) );
3405
3406                                 if ( $copy ) {
3407                                         $copyright = $copy->getLocalURL();
3408                                 }
3409                         }
3410
3411                         if ( !$copyright && $config->get( 'RightsUrl' ) ) {
3412                                 $copyright = $config->get( 'RightsUrl' );
3413                         }
3414                 }
3415
3416                 if ( $copyright ) {
3417                         $tags['copyright'] = Html::element( 'link', [
3418                                 'rel' => 'copyright',
3419                                 'href' => $copyright ]
3420                         );
3421                 }
3422
3423                 # Feeds
3424                 if ( $config->get( 'Feed' ) ) {
3425                         $feedLinks = [];
3426
3427                         foreach ( $this->getSyndicationLinks() as $format => $link ) {
3428                                 # Use the page name for the title.  In principle, this could
3429                                 # lead to issues with having the same name for different feeds
3430                                 # corresponding to the same page, but we can't avoid that at
3431                                 # this low a level.
3432
3433                                 $feedLinks[] = $this->feedLink(
3434                                         $format,
3435                                         $link,
3436                                         # Used messages: 'page-rss-feed' and 'page-atom-feed' (for an easier grep)
3437                                         $this->msg(
3438                                                 "page-{$format}-feed", $this->getTitle()->getPrefixedText()
3439                                         )->text()
3440                                 );
3441                         }
3442
3443                         # Recent changes feed should appear on every page (except recentchanges,
3444                         # that would be redundant). Put it after the per-page feed to avoid
3445                         # changing existing behavior. It's still available, probably via a
3446                         # menu in your browser. Some sites might have a different feed they'd
3447                         # like to promote instead of the RC feed (maybe like a "Recent New Articles"
3448                         # or "Breaking news" one). For this, we see if $wgOverrideSiteFeed is defined.
3449                         # If so, use it instead.
3450                         $sitename = $config->get( 'Sitename' );
3451                         if ( $config->get( 'OverrideSiteFeed' ) ) {
3452                                 foreach ( $config->get( 'OverrideSiteFeed' ) as $type => $feedUrl ) {
3453                                         // Note, this->feedLink escapes the url.
3454                                         $feedLinks[] = $this->feedLink(
3455                                                 $type,
3456                                                 $feedUrl,
3457                                                 $this->msg( "site-{$type}-feed", $sitename )->text()
3458                                         );
3459                                 }
3460                         } elseif ( !$this->getTitle()->isSpecial( 'Recentchanges' ) ) {
3461                                 $rctitle = SpecialPage::getTitleFor( 'Recentchanges' );
3462                                 foreach ( $config->get( 'AdvertisedFeedTypes' ) as $format ) {
3463                                         $feedLinks[] = $this->feedLink(
3464                                                 $format,
3465                                                 $rctitle->getLocalURL( [ 'feed' => $format ] ),
3466                                                 # For grep: 'site-rss-feed', 'site-atom-feed'
3467                                                 $this->msg( "site-{$format}-feed", $sitename )->text()
3468                                         );
3469                                 }
3470                         }
3471
3472                         # Allow extensions to change the list pf feeds. This hook is primarily for changing,
3473                         # manipulating or removing existing feed tags. If you want to add new feeds, you should
3474                         # use OutputPage::addFeedLink() instead.
3475                         Hooks::run( 'AfterBuildFeedLinks', [ &$feedLinks ] );
3476
3477                         $tags += $feedLinks;
3478                 }
3479
3480                 # Canonical URL
3481                 if ( $config->get( 'EnableCanonicalServerLink' ) ) {
3482                         if ( $canonicalUrl !== false ) {
3483                                 $canonicalUrl = wfExpandUrl( $canonicalUrl, PROTO_CANONICAL );
3484                         } else {
3485                                 if ( $this->isArticleRelated() ) {
3486                                         // This affects all requests where "setArticleRelated" is true. This is
3487                                         // typically all requests that show content (query title, curid, oldid, diff),
3488                                         // and all wikipage actions (edit, delete, purge, info, history etc.).
3489                                         // It does not apply to File pages and Special pages.
3490                                         // 'history' and 'info' actions address page metadata rather than the page
3491                                         // content itself, so they may not be canonicalized to the view page url.
3492                                         // TODO: this ought to be better encapsulated in the Action class.
3493                                         $action = Action::getActionName( $this->getContext() );
3494                                         if ( in_array( $action, [ 'history', 'info' ] ) ) {
3495                                                 $query = "action={$action}";
3496                                         } else {
3497                                                 $query = '';
3498                                         }
3499                                         $canonicalUrl = $this->getTitle()->getCanonicalURL( $query );
3500                                 } else {
3501                                         $reqUrl = $this->getRequest()->getRequestURL();
3502                                         $canonicalUrl = wfExpandUrl( $reqUrl, PROTO_CANONICAL );
3503                                 }
3504                         }
3505                 }
3506                 if ( $canonicalUrl !== false ) {
3507                         $tags[] = Html::element( 'link', [
3508                                 'rel' => 'canonical',
3509                                 'href' => $canonicalUrl
3510                         ] );
3511                 }
3512
3513                 return $tags;
3514         }
3515
3516         /**
3517          * @return string HTML tag links to be put in the header.
3518          * @deprecated since 1.24 Use OutputPage::headElement or if you have to,
3519          *   OutputPage::getHeadLinksArray directly.
3520          */
3521         public function getHeadLinks() {
3522                 wfDeprecated( __METHOD__, '1.24' );
3523                 return implode( "\n", $this->getHeadLinksArray() );
3524         }
3525
3526         /**
3527          * Generate a "<link rel/>" for a feed.
3528          *
3529          * @param string $type Feed type
3530          * @param string $url URL to the feed
3531          * @param string $text Value of the "title" attribute
3532          * @return string HTML fragment
3533          */
3534         private function feedLink( $type, $url, $text ) {
3535                 return Html::element( 'link', [
3536                         'rel' => 'alternate',
3537                         'type' => "application/$type+xml",
3538                         'title' => $text,
3539                         'href' => $url ]
3540                 );
3541         }
3542
3543         /**
3544          * Add a local or specified stylesheet, with the given media options.
3545          * Internal use only. Use OutputPage::addModuleStyles() if possible.
3546          *
3547          * @param string $style URL to the file
3548          * @param string $media To specify a media type, 'screen', 'printable', 'handheld' or any.
3549          * @param string $condition For IE conditional comments, specifying an IE version
3550          * @param string $dir Set to 'rtl' or 'ltr' for direction-specific sheets
3551          */
3552         public function addStyle( $style, $media = '', $condition = '', $dir = '' ) {
3553                 $options = [];
3554                 if ( $media ) {
3555                         $options['media'] = $media;
3556                 }
3557                 if ( $condition ) {
3558                         $options['condition'] = $condition;
3559                 }
3560                 if ( $dir ) {
3561                         $options['dir'] = $dir;
3562                 }
3563                 $this->styles[$style] = $options;
3564         }
3565
3566         /**
3567          * Adds inline CSS styles
3568          * Internal use only. Use OutputPage::addModuleStyles() if possible.
3569          *
3570          * @param mixed $style_css Inline CSS
3571          * @param string $flip Set to 'flip' to flip the CSS if needed
3572          */
3573         public function addInlineStyle( $style_css, $flip = 'noflip' ) {
3574                 if ( $flip === 'flip' && $this->getLanguage()->isRTL() ) {
3575                         # If wanted, and the interface is right-to-left, flip the CSS
3576                         $style_css = CSSJanus::transform( $style_css, true, false );
3577                 }
3578                 $this->mInlineStyles .= Html::inlineStyle( $style_css );
3579         }
3580
3581         /**
3582          * Build exempt modules and legacy non-ResourceLoader styles.
3583          *
3584          * @return string|WrappedStringList HTML
3585          */
3586         protected function buildExemptModules() {
3587                 global $wgContLang;
3588
3589                 $chunks = [];
3590                 // Things that go after the ResourceLoaderDynamicStyles marker
3591                 $append = [];
3592
3593                 // Exempt 'user' styles module (may need 'excludepages' for live preview)
3594                 if ( $this->isUserCssPreview() ) {
3595                         $append[] = $this->makeResourceLoaderLink(
3596                                 'user.styles',
3597                                 ResourceLoaderModule::TYPE_STYLES,
3598                                 [ 'excludepage' => $this->getTitle()->getPrefixedDBkey() ]
3599                         );
3600
3601                         // Load the previewed CSS. Janus it if needed.
3602                         // User-supplied CSS is assumed to in the wiki's content language.
3603                         $previewedCSS = $this->getRequest()->getText( 'wpTextbox1' );
3604                         if ( $this->getLanguage()->getDir() !== $wgContLang->getDir() ) {
3605                                 $previewedCSS = CSSJanus::transform( $previewedCSS, true, false );
3606                         }
3607                         $append[] = Html::inlineStyle( $previewedCSS );
3608                 }
3609
3610                 // We want site, private and user styles to override dynamically added styles from
3611                 // general modules, but we want dynamically added styles to override statically added
3612                 // style modules. So the order has to be:
3613                 // - page style modules (formatted by ResourceLoaderClientHtml::getHeadHtml())
3614                 // - dynamically loaded styles (added by mw.loader before ResourceLoaderDynamicStyles)
3615                 // - ResourceLoaderDynamicStyles marker
3616                 // - site/private/user styles
3617
3618                 // Add legacy styles added through addStyle()/addInlineStyle() here
3619                 $chunks[] = implode( '', $this->buildCssLinksArray() ) . $this->mInlineStyles;
3620
3621                 $chunks[] = Html::element(
3622                         'meta',
3623                         [ 'name' => 'ResourceLoaderDynamicStyles', 'content' => '' ]
3624                 );
3625
3626                 foreach ( $this->rlExemptStyleModules as $group => $moduleNames ) {
3627                         $chunks[] = $this->makeResourceLoaderLink( $moduleNames,
3628                                 ResourceLoaderModule::TYPE_STYLES
3629                         );
3630                 }
3631
3632                 return self::combineWrappedStrings( array_merge( $chunks, $append ) );
3633         }
3634
3635         /**
3636          * @return array
3637          */
3638         public function buildCssLinksArray() {
3639                 $links = [];
3640
3641                 // Add any extension CSS
3642                 foreach ( $this->mExtStyles as $url ) {
3643                         $this->addStyle( $url );
3644                 }
3645                 $this->mExtStyles = [];
3646
3647                 foreach ( $this->styles as $file => $options ) {
3648                         $link = $this->styleLink( $file, $options );
3649                         if ( $link ) {
3650                                 $links[$file] = $link;
3651                         }
3652                 }
3653                 return $links;
3654         }
3655
3656         /**
3657          * Generate \<link\> tags for stylesheets
3658          *
3659          * @param string $style URL to the file
3660          * @param array $options Option, can contain 'condition', 'dir', 'media' keys
3661          * @return string HTML fragment
3662          */
3663         protected function styleLink( $style, array $options ) {
3664                 if ( isset( $options['dir'] ) ) {
3665                         if ( $this->getLanguage()->getDir() != $options['dir'] ) {
3666                                 return '';
3667                         }
3668                 }
3669
3670                 if ( isset( $options['media'] ) ) {
3671                         $media = self::transformCssMedia( $options['media'] );
3672                         if ( is_null( $media ) ) {
3673                                 return '';
3674                         }
3675                 } else {
3676                         $media = 'all';
3677                 }
3678
3679                 if ( substr( $style, 0, 1 ) == '/' ||
3680                         substr( $style, 0, 5 ) == 'http:' ||
3681                         substr( $style, 0, 6 ) == 'https:' ) {
3682                         $url = $style;
3683                 } else {
3684                         $config = $this->getConfig();
3685                         $url = $config->get( 'StylePath' ) . '/' . $style . '?' .
3686                                 $config->get( 'StyleVersion' );
3687                 }
3688
3689                 $link = Html::linkedStyle( $url, $media );
3690
3691                 if ( isset( $options['condition'] ) ) {
3692                         $condition = htmlspecialchars( $options['condition'] );
3693                         $link = "<!--[if $condition]>$link<![endif]-->";
3694                 }
3695                 return $link;
3696         }
3697
3698         /**
3699          * Transform path to web-accessible static resource.
3700          *
3701          * This is used to add a validation hash as query string.
3702          * This aids various behaviors:
3703          *
3704          * - Put long Cache-Control max-age headers on responses for improved
3705          *   cache performance.
3706          * - Get the correct version of a file as expected by the current page.
3707          * - Instantly get the updated version of a file after deployment.
3708          *
3709          * Avoid using this for urls included in HTML as otherwise clients may get different
3710          * versions of a resource when navigating the site depending on when the page was cached.
3711          * If changes to the url propagate, this is not a problem (e.g. if the url is in
3712          * an external stylesheet).
3713          *
3714          * @since 1.27
3715          * @param Config $config
3716          * @param string $path Path-absolute URL to file (from document root, must start with "/")
3717          * @return string URL
3718          */
3719         public static function transformResourcePath( Config $config, $path ) {
3720                 global $IP;
3721
3722                 $localDir = $IP;
3723                 $remotePathPrefix = $config->get( 'ResourceBasePath' );
3724                 if ( $remotePathPrefix === '' ) {
3725                         // The configured base path is required to be empty string for
3726                         // wikis in the domain root
3727                         $remotePath = '/';
3728                 } else {
3729                         $remotePath = $remotePathPrefix;
3730                 }
3731                 if ( strpos( $path, $remotePath ) !== 0 || substr( $path, 0, 2 ) === '//' ) {
3732                         // - Path is outside wgResourceBasePath, ignore.
3733                         // - Path is protocol-relative. Fixes T155310. Not supported by RelPath lib.
3734                         return $path;
3735                 }
3736                 // For files in resources, extensions/ or skins/, ResourceBasePath is preferred here.
3737                 // For other misc files in $IP, we'll fallback to that as well. There is, however, a fourth
3738                 // supported dir/path pair in the configuration (wgUploadDirectory, wgUploadPath)
3739                 // which is not expected to be in wgResourceBasePath on CDNs. (T155146)
3740                 $uploadPath = $config->get( 'UploadPath' );
3741                 if ( strpos( $path, $uploadPath ) === 0 ) {
3742                         $localDir = $config->get( 'UploadDirectory' );
3743                         $remotePathPrefix = $remotePath = $uploadPath;
3744                 }
3745
3746                 $path = RelPath\getRelativePath( $path, $remotePath );
3747                 return self::transformFilePath( $remotePathPrefix, $localDir, $path );
3748         }
3749
3750         /**
3751          * Utility method for transformResourceFilePath().
3752          *
3753          * Caller is responsible for ensuring the file exists. Emits a PHP warning otherwise.
3754          *
3755          * @since 1.27
3756          * @param string $remotePath URL path prefix that points to $localPath
3757          * @param string $localPath File directory exposed at $remotePath
3758          * @param string $file Path to target file relative to $localPath
3759          * @return string URL
3760          */
3761         public static function transformFilePath( $remotePathPrefix, $localPath, $file ) {
3762                 $hash = md5_file( "$localPath/$file" );
3763                 if ( $hash === false ) {
3764                         wfLogWarning( __METHOD__ . ": Failed to hash $localPath/$file" );
3765                         $hash = '';
3766                 }
3767                 return "$remotePathPrefix/$file?" . substr( $hash, 0, 5 );
3768         }
3769
3770         /**
3771          * Transform "media" attribute based on request parameters
3772          *
3773          * @param string $media Current value of the "media" attribute
3774          * @return string Modified value of the "media" attribute, or null to skip
3775          * this stylesheet
3776          */
3777         public static function transformCssMedia( $media ) {
3778                 global $wgRequest;
3779
3780                 // https://www.w3.org/TR/css3-mediaqueries/#syntax
3781                 $screenMediaQueryRegex = '/^(?:only\s+)?screen\b/i';
3782
3783                 // Switch in on-screen display for media testing
3784                 $switches = [
3785                         'printable' => 'print',
3786                         'handheld' => 'handheld',
3787                 ];
3788                 foreach ( $switches as $switch => $targetMedia ) {
3789                         if ( $wgRequest->getBool( $switch ) ) {
3790                                 if ( $media == $targetMedia ) {
3791                                         $media = '';
3792                                 } elseif ( preg_match( $screenMediaQueryRegex, $media ) === 1 ) {
3793                                         /* This regex will not attempt to understand a comma-separated media_query_list
3794                                          *
3795                                          * Example supported values for $media:
3796                                          * 'screen', 'only screen', 'screen and (min-width: 982px)' ),
3797                                          * Example NOT supported value for $media:
3798                                          * '3d-glasses, screen, print and resolution > 90dpi'
3799                                          *
3800                                          * If it's a print request, we never want any kind of screen stylesheets
3801                                          * If it's a handheld request (currently the only other choice with a switch),
3802                                          * we don't want simple 'screen' but we might want screen queries that
3803                                          * have a max-width or something, so we'll pass all others on and let the
3804                                          * client do the query.
3805                                          */
3806                                         if ( $targetMedia == 'print' || $media == 'screen' ) {
3807                                                 return null;
3808                                         }
3809                                 }
3810                         }
3811                 }
3812
3813                 return $media;
3814         }
3815
3816         /**
3817          * Add a wikitext-formatted message to the output.
3818          * This is equivalent to:
3819          *
3820          *    $wgOut->addWikiText( wfMessage( ... )->plain() )
3821          */
3822         public function addWikiMsg( /*...*/ ) {
3823                 $args = func_get_args();
3824                 $name = array_shift( $args );
3825                 $this->addWikiMsgArray( $name, $args );
3826         }
3827
3828         /**
3829          * Add a wikitext-formatted message to the output.
3830          * Like addWikiMsg() except the parameters are taken as an array
3831          * instead of a variable argument list.
3832          *
3833          * @param string $name
3834          * @param array $args
3835          */
3836         public function addWikiMsgArray( $name, $args ) {
3837                 $this->addHTML( $this->msg( $name, $args )->parseAsBlock() );
3838         }
3839
3840         /**
3841          * This function takes a number of message/argument specifications, wraps them in
3842          * some overall structure, and then parses the result and adds it to the output.
3843          *
3844          * In the $wrap, $1 is replaced with the first message, $2 with the second,
3845          * and so on. The subsequent arguments may be either
3846          * 1) strings, in which case they are message names, or
3847          * 2) arrays, in which case, within each array, the first element is the message
3848          *    name, and subsequent elements are the parameters to that message.
3849          *
3850          * Don't use this for messages that are not in the user's interface language.
3851          *
3852          * For example:
3853          *
3854          *    $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>", 'some-error' );
3855          *
3856          * Is equivalent to:
3857          *
3858          *    $wgOut->addWikiText( "<div class='error'>\n"
3859          *        . wfMessage( 'some-error' )->plain() . "\n</div>" );
3860          *
3861          * The newline after the opening div is needed in some wikitext. See T21226.
3862          *
3863          * @param string $wrap
3864          */
3865         public function wrapWikiMsg( $wrap /*, ...*/ ) {
3866                 $msgSpecs = func_get_args();
3867                 array_shift( $msgSpecs );
3868                 $msgSpecs = array_values( $msgSpecs );
3869                 $s = $wrap;
3870                 foreach ( $msgSpecs as $n => $spec ) {
3871                         if ( is_array( $spec ) ) {
3872                                 $args = $spec;
3873                                 $name = array_shift( $args );
3874                                 if ( isset( $args['options'] ) ) {
3875                                         unset( $args['options'] );
3876                                         wfDeprecated(
3877                                                 'Adding "options" to ' . __METHOD__ . ' is no longer supported',
3878                                                 '1.20'
3879                                         );
3880                                 }
3881                         } else {
3882                                 $args = [];
3883                                 $name = $spec;
3884                         }
3885                         $s = str_replace( '$' . ( $n + 1 ), $this->msg( $name, $args )->plain(), $s );
3886                 }
3887                 $this->addWikiText( $s );
3888         }
3889
3890         /**
3891          * Enables/disables TOC, doesn't override __NOTOC__
3892          * @param bool $flag
3893          * @since 1.22
3894          */
3895         public function enableTOC( $flag = true ) {
3896                 $this->mEnableTOC = $flag;
3897         }
3898
3899         /**
3900          * @return bool
3901          * @since 1.22
3902          */
3903         public function isTOCEnabled() {
3904                 return $this->mEnableTOC;
3905         }
3906
3907         /**
3908          * Enables/disables section edit links, doesn't override __NOEDITSECTION__
3909          * @param bool $flag
3910          * @since 1.23
3911          */
3912         public function enableSectionEditLinks( $flag = true ) {
3913                 $this->mEnableSectionEditLinks = $flag;
3914         }
3915
3916         /**
3917          * @return bool
3918          * @since 1.23
3919          */
3920         public function sectionEditLinksEnabled() {
3921                 return $this->mEnableSectionEditLinks;
3922         }
3923
3924         /**
3925          * Helper function to setup the PHP implementation of OOUI to use in this request.
3926          *
3927          * @since 1.26
3928          * @param String $skinName The Skin name to determine the correct OOUI theme
3929          * @param String $dir Language direction
3930          */
3931         public static function setupOOUI( $skinName = '', $dir = 'ltr' ) {
3932                 $themes = ExtensionRegistry::getInstance()->getAttribute( 'SkinOOUIThemes' );
3933                 // Make keys (skin names) lowercase for case-insensitive matching.
3934                 $themes = array_change_key_case( $themes, CASE_LOWER );
3935                 $theme = isset( $themes[$skinName] ) ? $themes[$skinName] : 'MediaWiki';
3936                 // For example, 'OOUI\MediaWikiTheme'.
3937                 $themeClass = "OOUI\\{$theme}Theme";
3938                 OOUI\Theme::setSingleton( new $themeClass() );
3939                 OOUI\Element::setDefaultDir( $dir );
3940         }
3941
3942         /**
3943          * Add ResourceLoader module styles for OOUI and set up the PHP implementation of it for use with
3944          * MediaWiki and this OutputPage instance.
3945          *
3946          * @since 1.25
3947          */
3948         public function enableOOUI() {
3949                 self::setupOOUI(
3950                         strtolower( $this->getSkin()->getSkinName() ),
3951                         $this->getLanguage()->getDir()
3952                 );
3953                 $this->addModuleStyles( [
3954                         'oojs-ui-core.styles',
3955                         'oojs-ui.styles.icons',
3956                         'oojs-ui.styles.indicators',
3957                         'oojs-ui.styles.textures',
3958                         'mediawiki.widgets.styles',
3959                 ] );
3960         }
3961 }