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\Session\SessionManager;
  25 use WrappedString\WrappedString;
  26 use WrappedString\WrappedStringList;
  27
  28 /**
  29  * This class should be covered by a general architecture document which does
  30  * not exist as of January 2011.  This is one of the Core classes and should
  31  * be read at least once by any new developers.
  32  *
  33  * This class is used to prepare the final rendering. A skin is then
  34  * applied to the output parameters (links, javascript, html, categories ...).
  35  *
  36  * @todo FIXME: Another class handles sending the whole page to the client.
  37  *
  38  * Some comments comes from a pairing session between Zak Greant and Antoine Musso
  39  * in November 2010.
  40  *
  41  * @todo document
  42  */
  43 class OutputPage extends ContextSource {
  44         /** @var array Should be private. Used with addMeta() which adds "<meta>" */
  45         protected $mMetatags = [];
  46
  47         /** @var array */
  48         protected $mLinktags = [];
  49
  50         /** @var bool */
  51         protected $mCanonicalUrl = false;
  52
  53         /**
  54          * @var array Additional stylesheets. Looks like this is for extensions.
  55          *   Might be replaced by ResourceLoader.
  56          */
  57         protected $mExtStyles = [];
  58
  59         /**
  60          * @var string Should be private - has getter and setter. Contains
  61          *   the HTML title */
  62         public $mPagetitle = '';
  63
  64         /**
  65          * @var string Contains all of the "<body>" content. Should be private we
  66          *   got set/get accessors and the append() method.
  67          */
  68         public $mBodytext = '';
  69
  70         /**
  71          * Holds the debug lines that will be output as comments in page source if
  72          * $wgDebugComments is enabled. See also $wgShowDebug.
  73          * @deprecated since 1.20; use MWDebug class instead.
  74          */
  75         public $mDebugtext = '';
  76
  77         /** @var string Stores contents of "<title>" tag */
  78         private $mHTMLtitle = '';
  79
  80         /**
  81          * @var bool Is the displayed content related to the source of the
  82          *   corresponding wiki article.
  83          */
  84         private $mIsarticle = false;
  85
  86         /** @var bool Stores "article flag" toggle. */
  87         private $mIsArticleRelated = true;
  88
  89         /**
  90          * @var bool We have to set isPrintable(). Some pages should
  91          * never be printed (ex: redirections).
  92          */
  93         private $mPrintable = false;
  94
  95         /**
  96          * @var array Contains the page subtitle. Special pages usually have some
  97          *   links here. Don't confuse with site subtitle added by skins.
  98          */
  99         private $mSubtitle = [];
 100
 101         /** @var string */
 102         public $mRedirect = '';
 103
 104         /** @var int */
 105         protected $mStatusCode;
 106
 107         /**
 108          * @var string Used for sending cache control.
 109          *   The whole caching system should probably be moved into its own class.
 110          */
 111         protected $mLastModified = '';
 112
 113         /** @var array */
 114         protected $mCategoryLinks = [];
 115
 116         /** @var array */
 117         protected $mCategories = [];
 118
 119         /** @var array */
 120         protected $mIndicators = [];
 121
 122         /** @var array Array of Interwiki Prefixed (non DB key) Titles (e.g. 'fr:Test page') */
 123         private $mLanguageLinks = [];
 124
 125         /**
 126          * Used for JavaScript (predates ResourceLoader)
 127          * @todo We should split JS / CSS.
 128          * mScripts content is inserted as is in "<head>" by Skin. This might
 129          * contain either a link to a stylesheet or inline CSS.
 130          */
 131         private $mScripts = '';
 132
 133         /** @var string Inline CSS styles. Use addInlineStyle() sparingly */
 134         protected $mInlineStyles = '';
 135
 136         /**
 137          * @var string Used by skin template.
 138          * Example: $tpl->set( 'displaytitle', $out->mPageLinkTitle );
 139          */
 140         public $mPageLinkTitle = '';
 141
 142         /** @var array Array of elements in "<head>". Parser might add its own headers! */
 143         protected $mHeadItems = [];
 144
 145         /** @var array */
 146         protected $mModules = [];
 147
 148         /** @var array */
 149         protected $mModuleScripts = [];
 150
 151         /** @var array */
 152         protected $mModuleStyles = [];
 153
 154         /** @var ResourceLoader */
 155         protected $mResourceLoader;
 156
 157         /** @var array */
 158         protected $mJsConfigVars = [];
 159
 160         /** @var array */
 161         protected $mTemplateIds = [];
 162
 163         /** @var array */
 164         protected $mImageTimeKeys = [];
 165
 166         /** @var string */
 167         public $mRedirectCode = '';
 168
 169         protected $mFeedLinksAppendQuery = null;
 170
 171         /** @var array
 172          * What level of 'untrustworthiness' is allowed in CSS/JS modules loaded on this page?
 173          * @see ResourceLoaderModule::$origin
 174          * ResourceLoaderModule::ORIGIN_ALL is assumed unless overridden;
 175          */
 176         protected $mAllowedModules = [
 177                 ResourceLoaderModule::TYPE_COMBINED => ResourceLoaderModule::ORIGIN_ALL,
 178         ];
 179
 180         /** @var bool Whether output is disabled.  If this is true, the 'output' method will do nothing. */
 181         protected $mDoNothing = false;
 182
 183         // Parser related.
 184
 185         /** @var int */
 186         protected $mContainsNewMagic = 0;
 187
 188         /**
 189          * lazy initialised, use parserOptions()
 190          * @var ParserOptions
 191          */
 192         protected $mParserOptions = null;
 193
 194         /**
 195          * Handles the Atom / RSS links.
 196          * We probably only support Atom in 2011.
 197          * @see $wgAdvertisedFeedTypes
 198          */
 199         private $mFeedLinks = [];
 200
 201         // Gwicke work on squid caching? Roughly from 2003.
 202         protected $mEnableClientCache = true;
 203
 204         /** @var bool Flag if output should only contain the body of the article. */
 205         private $mArticleBodyOnly = false;
 206
 207         /** @var bool */
 208         protected $mNewSectionLink = false;
 209
 210         /** @var bool */
 211         protected $mHideNewSectionLink = false;
 212
 213         /**
 214          * @var bool Comes from the parser. This was probably made to load CSS/JS
 215          * only if we had "<gallery>". Used directly in CategoryPage.php.
 216          * Looks like ResourceLoader can replace this.
 217          */
 218         public $mNoGallery = false;
 219
 220         /** @var string */
 221         private $mPageTitleActionText = '';
 222
 223         /** @var int Cache stuff. Looks like mEnableClientCache */
 224         protected $mCdnMaxage = 0;
 225         /** @var int Upper limit on mCdnMaxage */
 226         protected $mCdnMaxageLimit = INF;
 227
 228         /**
 229          * @var bool Controls if anti-clickjacking / frame-breaking headers will
 230          * be sent. This should be done for pages where edit actions are possible.
 231          * Setters: $this->preventClickjacking() and $this->allowClickjacking().
 232          */
 233         protected $mPreventClickjacking = true;
 234
 235         /** @var int To include the variable {{REVISIONID}} */
 236         private $mRevisionId = null;
 237
 238         /** @var string */
 239         private $mRevisionTimestamp = null;
 240
 241         /** @var array */
 242         protected $mFileVersion = null;
 243
 244         /**
 245          * @var array An array of stylesheet filenames (relative from skins path),
 246          * with options for CSS media, IE conditions, and RTL/LTR direction.
 247          * For internal use; add settings in the skin via $this->addStyle()
 248          *
 249          * Style again! This seems like a code duplication since we already have
 250          * mStyles. This is what makes Open Source amazing.
 251          */
 252         protected $styles = [];
 253
 254         /**
 255          * Whether jQuery is already handled.
 256          */
 257         protected $mJQueryDone = false;
 258
 259         private $mIndexPolicy = 'index';
 260         private $mFollowPolicy = 'follow';
 261         private $mVaryHeader = [
 262                 'Accept-Encoding' => [ 'match=gzip' ],
 263         ];
 264
 265         /**
 266          * If the current page was reached through a redirect, $mRedirectedFrom contains the Title
 267          * of the redirect.
 268          *
 269          * @var Title
 270          */
 271         private $mRedirectedFrom = null;
 272
 273         /**
 274          * Additional key => value data
 275          */
 276         private $mProperties = [];
 277
 278         /**
 279          * @var string|null ResourceLoader target for load.php links. If null, will be omitted
 280          */
 281         private $mTarget = null;
 282
 283         /**
 284          * @var bool Whether parser output should contain table of contents
 285          */
 286         private $mEnableTOC = true;
 287
 288         /**
 289          * @var bool Whether parser output should contain section edit links
 290          */
 291         private $mEnableSectionEditLinks = true;
 292
 293         /**
 294          * @var string|null The URL to send in a <link> element with rel=copyright
 295          */
 296         private $copyrightUrl;
 297
 298         /**
 299          * Constructor for OutputPage. This should not be called directly.
 300          * Instead a new RequestContext should be created and it will implicitly create
 301          * a OutputPage tied to that context.
 302          * @param IContextSource|null $context
 303          */
 304         function __construct( IContextSource $context = null ) {
 305                 if ( $context === null ) {
 306                         # Extensions should use `new RequestContext` instead of `new OutputPage` now.
 307                         wfDeprecated( __METHOD__, '1.18' );
 308                 } else {
 309                         $this->setContext( $context );
 310                 }
 311         }
 312
 313         /**
 314          * Redirect to $url rather than displaying the normal page
 315          *
 316          * @param string $url URL
 317          * @param string $responsecode HTTP status code
 318          */
 319         public function redirect( $url, $responsecode = '302' ) {
 320                 # Strip newlines as a paranoia check for header injection in PHP<5.1.2
 321                 $this->mRedirect = str_replace( "\n", '', $url );
 322                 $this->mRedirectCode = $responsecode;
 323         }
 324
 325         /**
 326          * Get the URL to redirect to, or an empty string if not redirect URL set
 327          *
 328          * @return string
 329          */
 330         public function getRedirect() {
 331                 return $this->mRedirect;
 332         }
 333
 334         /**
 335          * Set the copyright URL to send with the output.
 336          * Empty string to omit, null to reset.
 337          *
 338          * @since 1.26
 339          *
 340          * @param string|null $url
 341          */
 342         public function setCopyrightUrl( $url ) {
 343                 $this->copyrightUrl = $url;
 344         }
 345
 346         /**
 347          * Set the HTTP status code to send with the output.
 348          *
 349          * @param int $statusCode
 350          */
 351         public function setStatusCode( $statusCode ) {
 352                 $this->mStatusCode = $statusCode;
 353         }
 354
 355         /**
 356          * Add a new "<meta>" tag
 357          * To add an http-equiv meta tag, precede the name with "http:"
 358          *
 359          * @param string $name Tag name
 360          * @param string $val Tag value
 361          */
 362         function addMeta( $name, $val ) {
 363                 array_push( $this->mMetatags, [ $name, $val ] );
 364         }
 365
 366         /**
 367          * Returns the current <meta> tags
 368          *
 369          * @since 1.25
 370          * @return array
 371          */
 372         public function getMetaTags() {
 373                 return $this->mMetatags;
 374         }
 375
 376         /**
 377          * Add a new \<link\> tag to the page header.
 378          *
 379          * Note: use setCanonicalUrl() for rel=canonical.
 380          *
 381          * @param array $linkarr Associative array of attributes.
 382          */
 383         function addLink( array $linkarr ) {
 384                 array_push( $this->mLinktags, $linkarr );
 385         }
 386
 387         /**
 388          * Returns the current <link> tags
 389          *
 390          * @since 1.25
 391          * @return array
 392          */
 393         public function getLinkTags() {
 394                 return $this->mLinktags;
 395         }
 396
 397         /**
 398          * Add a new \<link\> with "rel" attribute set to "meta"
 399          *
 400          * @param array $linkarr Associative array mapping attribute names to their
 401          *                 values, both keys and values will be escaped, and the
 402          *                 "rel" attribute will be automatically added
 403          */
 404         function addMetadataLink( array $linkarr ) {
 405                 $linkarr['rel'] = $this->getMetadataAttribute();
 406                 $this->addLink( $linkarr );
 407         }
 408
 409         /**
 410          * Set the URL to be used for the <link rel=canonical>. This should be used
 411          * in preference to addLink(), to avoid duplicate link tags.
 412          * @param string $url
 413          */
 414         function setCanonicalUrl( $url ) {
 415                 $this->mCanonicalUrl = $url;
 416         }
 417
 418         /**
 419          * Returns the URL to be used for the <link rel=canonical> if
 420          * one is set.
 421          *
 422          * @since 1.25
 423          * @return bool|string
 424          */
 425         public function getCanonicalUrl() {
 426                 return $this->mCanonicalUrl;
 427         }
 428
 429         /**
 430          * Get the value of the "rel" attribute for metadata links
 431          *
 432          * @return string
 433          */
 434         public function getMetadataAttribute() {
 435                 # note: buggy CC software only reads first "meta" link
 436                 static $haveMeta = false;
 437                 if ( $haveMeta ) {
 438                         return 'alternate meta';
 439                 } else {
 440                         $haveMeta = true;
 441                         return 'meta';
 442                 }
 443         }
 444
 445         /**
 446          * Add raw HTML to the list of scripts (including \<script\> tag, etc.)
 447          * Internal use only. Use OutputPage::addModules() or OutputPage::addJsConfigVars()
 448          * if possible.
 449          *
 450          * @param string $script Raw HTML
 451          */
 452         function addScript( $script ) {
 453                 $this->mScripts .= $script;
 454         }
 455
 456         /**
 457          * Register and add a stylesheet from an extension directory.
 458          *
 459          * @deprecated since 1.27 use addModuleStyles() or addStyle() instead
 460          * @param string $url Path to sheet.  Provide either a full url (beginning
 461          *             with 'http', etc) or a relative path from the document root
 462          *             (beginning with '/').  Otherwise it behaves identically to
 463          *             addStyle() and draws from the /skins folder.
 464          */
 465         public function addExtensionStyle( $url ) {
 466                 wfDeprecated( __METHOD__, '1.27' );
 467                 array_push( $this->mExtStyles, $url );
 468         }
 469
 470         /**
 471          * Get all styles added by extensions
 472          *
 473          * @deprecated since 1.27
 474          * @return array
 475          */
 476         function getExtStyle() {
 477                 wfDeprecated( __METHOD__, '1.27' );
 478                 return $this->mExtStyles;
 479         }
 480
 481         /**
 482          * Add a JavaScript file out of skins/common, or a given relative path.
 483          * Internal use only. Use OutputPage::addModules() if possible.
 484          *
 485          * @param string $file Filename in skins/common or complete on-server path
 486          *              (/foo/bar.js)
 487          * @param string $version Style version of the file. Defaults to $wgStyleVersion
 488          */
 489         public function addScriptFile( $file, $version = null ) {
 490                 // See if $file parameter is an absolute URL or begins with a slash
 491                 if ( substr( $file, 0, 1 ) == '/' || preg_match( '#^[a-z]*://#i', $file ) ) {
 492                         $path = $file;
 493                 } else {
 494                         $path = $this->getConfig()->get( 'StylePath' ) . "/common/{$file}";
 495                 }
 496                 if ( is_null( $version ) ) {
 497                         $version = $this->getConfig()->get( 'StyleVersion' );
 498                 }
 499                 $this->addScript( Html::linkedScript( wfAppendQuery( $path, $version ) ) );
 500         }
 501
 502         /**
 503          * Add a self-contained script tag with the given contents
 504          * Internal use only. Use OutputPage::addModules() if possible.
 505          *
 506          * @param string $script JavaScript text, no "<script>" tags
 507          */
 508         public function addInlineScript( $script ) {
 509                 $this->mScripts .= Html::inlineScript( $script );
 510         }
 511
 512         /**
 513          * Filter an array of modules to remove insufficiently trustworthy members, and modules
 514          * which are no longer registered (eg a page is cached before an extension is disabled)
 515          * @param array $modules
 516          * @param string|null $position If not null, only return modules with this position
 517          * @param string $type
 518          * @return array
 519          */
 520         protected function filterModules( array $modules, $position = null,
 521                 $type = ResourceLoaderModule::TYPE_COMBINED
 522         ) {
 523                 $resourceLoader = $this->getResourceLoader();
 524                 $filteredModules = [];
 525                 foreach ( $modules as $val ) {
 526                         $module = $resourceLoader->getModule( $val );
 527                         if ( $module instanceof ResourceLoaderModule
 528                                 && $module->getOrigin() <= $this->getAllowedModules( $type )
 529                                 && ( is_null( $position ) || $module->getPosition() == $position )
 530                                 && ( !$this->mTarget || in_array( $this->mTarget, $module->getTargets() ) )
 531                         ) {
 532                                 $filteredModules[] = $val;
 533                         }
 534                 }
 535                 return $filteredModules;
 536         }
 537
 538         /**
 539          * Get the list of modules to include on this page
 540          *
 541          * @param bool $filter Whether to filter out insufficiently trustworthy modules
 542          * @param string|null $position If not null, only return modules with this position
 543          * @param string $param
 544          * @return array Array of module names
 545          */
 546         public function getModules( $filter = false, $position = null, $param = 'mModules' ) {
 547                 $modules = array_values( array_unique( $this->$param ) );
 548                 return $filter
 549                         ? $this->filterModules( $modules, $position )
 550                         : $modules;
 551         }
 552
 553         /**
 554          * Add one or more modules recognized by ResourceLoader. Modules added
 555          * through this function will be loaded by ResourceLoader when the
 556          * page loads.
 557          *
 558          * @param string|array $modules Module name (string) or array of module names
 559          */
 560         public function addModules( $modules ) {
 561                 $this->mModules = array_merge( $this->mModules, (array)$modules );
 562         }
 563
 564         /**
 565          * Get the list of module JS to include on this page
 566          *
 567          * @param bool $filter
 568          * @param string|null $position
 569          *
 570          * @return array Array of module names
 571          */
 572         public function getModuleScripts( $filter = false, $position = null ) {
 573                 return $this->getModules( $filter, $position, 'mModuleScripts' );
 574         }
 575
 576         /**
 577          * Add only JS of one or more modules recognized by ResourceLoader. Module
 578          * scripts added through this function will be loaded by ResourceLoader when
 579          * the page loads.
 580          *
 581          * @param string|array $modules Module name (string) or array of module names
 582          */
 583         public function addModuleScripts( $modules ) {
 584                 $this->mModuleScripts = array_merge( $this->mModuleScripts, (array)$modules );
 585         }
 586
 587         /**
 588          * Get the list of module CSS to include on this page
 589          *
 590          * @param bool $filter
 591          * @param string|null $position
 592          *
 593          * @return array Array of module names
 594          */
 595         public function getModuleStyles( $filter = false, $position = null ) {
 596                 return $this->getModules( $filter, $position, 'mModuleStyles' );
 597         }
 598
 599         /**
 600          * Add only CSS of one or more modules recognized by ResourceLoader.
 601          *
 602          * Module styles added through this function will be added using standard link CSS
 603          * tags, rather than as a combined Javascript and CSS package. Thus, they will
 604          * load when JavaScript is disabled (unless CSS also happens to be disabled).
 605          *
 606          * @param string|array $modules Module name (string) or array of module names
 607          */
 608         public function addModuleStyles( $modules ) {
 609                 $this->mModuleStyles = array_merge( $this->mModuleStyles, (array)$modules );
 610         }
 611
 612         /**
 613          * Get the list of module messages to include on this page
 614          *
 615          * @deprecated since 1.26 Obsolete
 616          * @param bool $filter
 617          * @param string|null $position
 618          * @return array Array of module names
 619          */
 620         public function getModuleMessages( $filter = false, $position = null ) {
 621                 wfDeprecated( __METHOD__, '1.26' );
 622                 return [];
 623         }
 624
 625         /**
 626          * Load messages of one or more ResourceLoader modules.
 627          *
 628          * @deprecated since 1.26 Use addModules() instead
 629          * @param string|array $modules Module name (string) or array of module names
 630          */
 631         public function addModuleMessages( $modules ) {
 632                 wfDeprecated( __METHOD__, '1.26' );
 633         }
 634
 635         /**
 636          * @return null|string ResourceLoader target
 637          */
 638         public function getTarget() {
 639                 return $this->mTarget;
 640         }
 641
 642         /**
 643          * Sets ResourceLoader target for load.php links. If null, will be omitted
 644          *
 645          * @param string|null $target
 646          */
 647         public function setTarget( $target ) {
 648                 $this->mTarget = $target;
 649         }
 650
 651         /**
 652          * Get an array of head items
 653          *
 654          * @return array
 655          */
 656         function getHeadItemsArray() {
 657                 return $this->mHeadItems;
 658         }
 659
 660         /**
 661          * Add or replace an header item to the output
 662          *
 663          * Whenever possible, use more specific options like ResourceLoader modules,
 664          * OutputPage::addLink(), OutputPage::addMetaLink() and OutputPage::addFeedLink()
 665          * Fallback options for those are: OutputPage::addStyle, OutputPage::addScript(),
 666          * OutputPage::addInlineScript() and OutputPage::addInlineStyle()
 667          * This would be your very LAST fallback.
 668          *
 669          * @param string $name Item name
 670          * @param string $value Raw HTML
 671          */
 672         public function addHeadItem( $name, $value ) {
 673                 $this->mHeadItems[$name] = $value;
 674         }
 675
 676         /**
 677          * Check if the header item $name is already set
 678          *
 679          * @param string $name Item name
 680          * @return bool
 681          */
 682         public function hasHeadItem( $name ) {
 683                 return isset( $this->mHeadItems[$name] );
 684         }
 685
 686         /**
 687          * @deprecated since 1.28 Obsolete - wgUseETag experiment was removed.
 688          * @param string $tag
 689          */
 690         public function setETag( $tag ) {
 691         }
 692
 693         /**
 694          * Set whether the output should only contain the body of the article,
 695          * without any skin, sidebar, etc.
 696          * Used e.g. when calling with "action=render".
 697          *
 698          * @param bool $only Whether to output only the body of the article
 699          */
 700         public function setArticleBodyOnly( $only ) {
 701                 $this->mArticleBodyOnly = $only;
 702         }
 703
 704         /**
 705          * Return whether the output will contain only the body of the article
 706          *
 707          * @return bool
 708          */
 709         public function getArticleBodyOnly() {
 710                 return $this->mArticleBodyOnly;
 711         }
 712
 713         /**
 714          * Set an additional output property
 715          * @since 1.21
 716          *
 717          * @param string $name
 718          * @param mixed $value
 719          */
 720         public function setProperty( $name, $value ) {
 721                 $this->mProperties[$name] = $value;
 722         }
 723
 724         /**
 725          * Get an additional output property
 726          * @since 1.21
 727          *
 728          * @param string $name
 729          * @return mixed Property value or null if not found
 730          */
 731         public function getProperty( $name ) {
 732                 if ( isset( $this->mProperties[$name] ) ) {
 733                         return $this->mProperties[$name];
 734                 } else {
 735                         return null;
 736                 }
 737         }
 738
 739         /**
 740          * checkLastModified tells the client to use the client-cached page if
 741          * possible. If successful, the OutputPage is disabled so that
 742          * any future call to OutputPage->output() have no effect.
 743          *
 744          * Side effect: sets mLastModified for Last-Modified header
 745          *
 746          * @param string $timestamp
 747          *
 748          * @return bool True if cache-ok headers was sent.
 749          */
 750         public function checkLastModified( $timestamp ) {
 751                 if ( !$timestamp || $timestamp == '19700101000000' ) {
 752                         wfDebug( __METHOD__ . ": CACHE DISABLED, NO TIMESTAMP\n" );
 753                         return false;
 754                 }
 755                 $config = $this->getConfig();
 756                 if ( !$config->get( 'CachePages' ) ) {
 757                         wfDebug( __METHOD__ . ": CACHE DISABLED\n" );
 758                         return false;
 759                 }
 760
 761                 $timestamp = wfTimestamp( TS_MW, $timestamp );
 762                 $modifiedTimes = [
 763                         'page' => $timestamp,
 764                         'user' => $this->getUser()->getTouched(),
 765                         'epoch' => $config->get( 'CacheEpoch' )
 766                 ];
 767                 if ( $config->get( 'UseSquid' ) ) {
 768                         // bug 44570: the core page itself may not change, but resources might
 769                         $modifiedTimes['sepoch'] = wfTimestamp( TS_MW, time() - $config->get( 'SquidMaxage' ) );
 770                 }
 771                 Hooks::run( 'OutputPageCheckLastModified', [ &$modifiedTimes, $this ] );
 772
 773                 $maxModified = max( $modifiedTimes );
 774                 $this->mLastModified = wfTimestamp( TS_RFC2822, $maxModified );
 775
 776                 $clientHeader = $this->getRequest()->getHeader( 'If-Modified-Since' );
 777                 if ( $clientHeader === false ) {
 778                         wfDebug( __METHOD__ . ": client did not send If-Modified-Since header", 'private' );
 779                         return false;
 780                 }
 781
 782                 # IE sends sizes after the date like this:
 783                 # Wed, 20 Aug 2003 06:51:19 GMT; length=5202
 784                 # this breaks strtotime().
 785                 $clientHeader = preg_replace( '/;.*$/', '', $clientHeader );
 786
 787                 MediaWiki\suppressWarnings(); // E_STRICT system time bitching
 788                 $clientHeaderTime = strtotime( $clientHeader );
 789                 MediaWiki\restoreWarnings();
 790                 if ( !$clientHeaderTime ) {
 791                         wfDebug( __METHOD__
 792                                 . ": unable to parse the client's If-Modified-Since header: $clientHeader\n" );
 793                         return false;
 794                 }
 795                 $clientHeaderTime = wfTimestamp( TS_MW, $clientHeaderTime );
 796
 797                 # Make debug info
 798                 $info = '';
 799                 foreach ( $modifiedTimes as $name => $value ) {
 800                         if ( $info !== '' ) {
 801                                 $info .= ', ';
 802                         }
 803                         $info .= "$name=" . wfTimestamp( TS_ISO_8601, $value );
 804                 }
 805
 806                 wfDebug( __METHOD__ . ": client sent If-Modified-Since: " .
 807                         wfTimestamp( TS_ISO_8601, $clientHeaderTime ), 'private' );
 808                 wfDebug( __METHOD__ . ": effective Last-Modified: " .
 809                         wfTimestamp( TS_ISO_8601, $maxModified ), 'private' );
 810                 if ( $clientHeaderTime < $maxModified ) {
 811                         wfDebug( __METHOD__ . ": STALE, $info", 'private' );
 812                         return false;
 813                 }
 814
 815                 # Not modified
 816                 # Give a 304 Not Modified response code and disable body output
 817                 wfDebug( __METHOD__ . ": NOT MODIFIED, $info", 'private' );
 818                 ini_set( 'zlib.output_compression', 0 );
 819                 $this->getRequest()->response()->statusHeader( 304 );
 820                 $this->sendCacheControl();
 821                 $this->disable();
 822
 823                 // Don't output a compressed blob when using ob_gzhandler;
 824                 // it's technically against HTTP spec and seems to confuse
 825                 // Firefox when the response gets split over two packets.
 826                 wfClearOutputBuffers();
 827
 828                 return true;
 829         }
 830
 831         /**
 832          * Override the last modified timestamp
 833          *
 834          * @param string $timestamp New timestamp, in a format readable by
 835          *        wfTimestamp()
 836          */
 837         public function setLastModified( $timestamp ) {
 838                 $this->mLastModified = wfTimestamp( TS_RFC2822, $timestamp );
 839         }
 840
 841         /**
 842          * Set the robot policy for the page: <http://www.robotstxt.org/meta.html>
 843          *
 844          * @param string $policy The literal string to output as the contents of
 845          *   the meta tag.  Will be parsed according to the spec and output in
 846          *   standardized form.
 847          * @return null
 848          */
 849         public function setRobotPolicy( $policy ) {
 850                 $policy = Article::formatRobotPolicy( $policy );
 851
 852                 if ( isset( $policy['index'] ) ) {
 853                         $this->setIndexPolicy( $policy['index'] );
 854                 }
 855                 if ( isset( $policy['follow'] ) ) {
 856                         $this->setFollowPolicy( $policy['follow'] );
 857                 }
 858         }
 859
 860         /**
 861          * Set the index policy for the page, but leave the follow policy un-
 862          * touched.
 863          *
 864          * @param string $policy Either 'index' or 'noindex'.
 865          * @return null
 866          */
 867         public function setIndexPolicy( $policy ) {
 868                 $policy = trim( $policy );
 869                 if ( in_array( $policy, [ 'index', 'noindex' ] ) ) {
 870                         $this->mIndexPolicy = $policy;
 871                 }
 872         }
 873
 874         /**
 875          * Set the follow policy for the page, but leave the index policy un-
 876          * touched.
 877          *
 878          * @param string $policy Either 'follow' or 'nofollow'.
 879          * @return null
 880          */
 881         public function setFollowPolicy( $policy ) {
 882                 $policy = trim( $policy );
 883                 if ( in_array( $policy, [ 'follow', 'nofollow' ] ) ) {
 884                         $this->mFollowPolicy = $policy;
 885                 }
 886         }
 887
 888         /**
 889          * Set the new value of the "action text", this will be added to the
 890          * "HTML title", separated from it with " - ".
 891          *
 892          * @param string $text New value of the "action text"
 893          */
 894         public function setPageTitleActionText( $text ) {
 895                 $this->mPageTitleActionText = $text;
 896         }
 897
 898         /**
 899          * Get the value of the "action text"
 900          *
 901          * @return string
 902          */
 903         public function getPageTitleActionText() {
 904                 return $this->mPageTitleActionText;
 905         }
 906
 907         /**
 908          * "HTML title" means the contents of "<title>".
 909          * It is stored as plain, unescaped text and will be run through htmlspecialchars in the skin file.
 910          *
 911          * @param string|Message $name
 912          */
 913         public function setHTMLTitle( $name ) {
 914                 if ( $name instanceof Message ) {
 915                         $this->mHTMLtitle = $name->setContext( $this->getContext() )->text();
 916                 } else {
 917                         $this->mHTMLtitle = $name;
 918                 }
 919         }
 920
 921         /**
 922          * Return the "HTML title", i.e. the content of the "<title>" tag.
 923          *
 924          * @return string
 925          */
 926         public function getHTMLTitle() {
 927                 return $this->mHTMLtitle;
 928         }
 929
 930         /**
 931          * Set $mRedirectedFrom, the Title of the page which redirected us to the current page.
 932          *
 933          * @param Title $t
 934          */
 935         public function setRedirectedFrom( $t ) {
 936                 $this->mRedirectedFrom = $t;
 937         }
 938
 939         /**
 940          * "Page title" means the contents of \<h1\>. It is stored as a valid HTML
 941          * fragment. This function allows good tags like \<sup\> in the \<h1\> tag,
 942          * but not bad tags like \<script\>. This function automatically sets
 943          * \<title\> to the same content as \<h1\> but with all tags removed. Bad
 944          * tags that were escaped in \<h1\> will still be escaped in \<title\>, and
 945          * good tags like \<i\> will be dropped entirely.
 946          *
 947          * @param string|Message $name
 948          */
 949         public function setPageTitle( $name ) {
 950                 if ( $name instanceof Message ) {
 951                         $name = $name->setContext( $this->getContext() )->text();
 952                 }
 953
 954                 # change "<script>foo&bar</script>" to "&lt;script&gt;foo&amp;bar&lt;/script&gt;"
 955                 # but leave "<i>foobar</i>" alone
 956                 $nameWithTags = Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags( $name ) );
 957                 $this->mPagetitle = $nameWithTags;
 958
 959                 # change "<i>foo&amp;bar</i>" to "foo&bar"
 960                 $this->setHTMLTitle(
 961                         $this->msg( 'pagetitle' )->rawParams( Sanitizer::stripAllTags( $nameWithTags ) )
 962                                 ->inContentLanguage()
 963                 );
 964         }
 965
 966         /**
 967          * Return the "page title", i.e. the content of the \<h1\> tag.
 968          *
 969          * @return string
 970          */
 971         public function getPageTitle() {
 972                 return $this->mPagetitle;
 973         }
 974
 975         /**
 976          * Set the Title object to use
 977          *
 978          * @param Title $t
 979          */
 980         public function setTitle( Title $t ) {
 981                 $this->getContext()->setTitle( $t );
 982         }
 983
 984         /**
 985          * Replace the subtitle with $str
 986          *
 987          * @param string|Message $str New value of the subtitle. String should be safe HTML.
 988          */
 989         public function setSubtitle( $str ) {
 990                 $this->clearSubtitle();
 991                 $this->addSubtitle( $str );
 992         }
 993
 994         /**
 995          * Add $str to the subtitle
 996          *
 997          * @param string|Message $str String or Message to add to the subtitle. String should be safe HTML.
 998          */
 999         public function addSubtitle( $str ) {
1000                 if ( $str instanceof Message ) {
1001                         $this->mSubtitle[] = $str->setContext( $this->getContext() )->parse();
1002                 } else {
1003                         $this->mSubtitle[] = $str;
1004                 }
1005         }
1006
1007         /**
1008          * Build message object for a subtitle containing a backlink to a page
1009          *
1010          * @param Title $title Title to link to
1011          * @param array $query Array of additional parameters to include in the link
1012          * @return Message
1013          * @since 1.25
1014          */
1015         public static function buildBacklinkSubtitle( Title $title, $query = [] ) {
1016                 if ( $title->isRedirect() ) {
1017                         $query['redirect'] = 'no';
1018                 }
1019                 return wfMessage( 'backlinksubtitle' )
1020                         ->rawParams( Linker::link( $title, null, [], $query ) );
1021         }
1022
1023         /**
1024          * Add 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          */
1029         public function addBacklinkSubtitle( Title $title, $query = [] ) {
1030                 $this->addSubtitle( self::buildBacklinkSubtitle( $title, $query ) );
1031         }
1032
1033         /**
1034          * Clear the subtitles
1035          */
1036         public function clearSubtitle() {
1037                 $this->mSubtitle = [];
1038         }
1039
1040         /**
1041          * Get the subtitle
1042          *
1043          * @return string
1044          */
1045         public function getSubtitle() {
1046                 return implode( "<br />\n\t\t\t\t", $this->mSubtitle );
1047         }
1048
1049         /**
1050          * Set the page as printable, i.e. it'll be displayed with all
1051          * print styles included
1052          */
1053         public function setPrintable() {
1054                 $this->mPrintable = true;
1055         }
1056
1057         /**
1058          * Return whether the page is "printable"
1059          *
1060          * @return bool
1061          */
1062         public function isPrintable() {
1063                 return $this->mPrintable;
1064         }
1065
1066         /**
1067          * Disable output completely, i.e. calling output() will have no effect
1068          */
1069         public function disable() {
1070                 $this->mDoNothing = true;
1071         }
1072
1073         /**
1074          * Return whether the output will be completely disabled
1075          *
1076          * @return bool
1077          */
1078         public function isDisabled() {
1079                 return $this->mDoNothing;
1080         }
1081
1082         /**
1083          * Show an "add new section" link?
1084          *
1085          * @return bool
1086          */
1087         public function showNewSectionLink() {
1088                 return $this->mNewSectionLink;
1089         }
1090
1091         /**
1092          * Forcibly hide the new section link?
1093          *
1094          * @return bool
1095          */
1096         public function forceHideNewSectionLink() {
1097                 return $this->mHideNewSectionLink;
1098         }
1099
1100         /**
1101          * Add or remove feed links in the page header
1102          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
1103          * for the new version
1104          * @see addFeedLink()
1105          *
1106          * @param bool $show True: add default feeds, false: remove all feeds
1107          */
1108         public function setSyndicated( $show = true ) {
1109                 if ( $show ) {
1110                         $this->setFeedAppendQuery( false );
1111                 } else {
1112                         $this->mFeedLinks = [];
1113                 }
1114         }
1115
1116         /**
1117          * Add default feeds to the page header
1118          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
1119          * for the new version
1120          * @see addFeedLink()
1121          *
1122          * @param string $val Query to append to feed links or false to output
1123          *        default links
1124          */
1125         public function setFeedAppendQuery( $val ) {
1126                 $this->mFeedLinks = [];
1127
1128                 foreach ( $this->getConfig()->get( 'AdvertisedFeedTypes' ) as $type ) {
1129                         $query = "feed=$type";
1130                         if ( is_string( $val ) ) {
1131                                 $query .= '&' . $val;
1132                         }
1133                         $this->mFeedLinks[$type] = $this->getTitle()->getLocalURL( $query );
1134                 }
1135         }
1136
1137         /**
1138          * Add a feed link to the page header
1139          *
1140          * @param string $format Feed type, should be a key of $wgFeedClasses
1141          * @param string $href URL
1142          */
1143         public function addFeedLink( $format, $href ) {
1144                 if ( in_array( $format, $this->getConfig()->get( 'AdvertisedFeedTypes' ) ) ) {
1145                         $this->mFeedLinks[$format] = $href;
1146                 }
1147         }
1148
1149         /**
1150          * Should we output feed links for this page?
1151          * @return bool
1152          */
1153         public function isSyndicated() {
1154                 return count( $this->mFeedLinks ) > 0;
1155         }
1156
1157         /**
1158          * Return URLs for each supported syndication format for this page.
1159          * @return array Associating format keys with URLs
1160          */
1161         public function getSyndicationLinks() {
1162                 return $this->mFeedLinks;
1163         }
1164
1165         /**
1166          * Will currently always return null
1167          *
1168          * @return null
1169          */
1170         public function getFeedAppendQuery() {
1171                 return $this->mFeedLinksAppendQuery;
1172         }
1173
1174         /**
1175          * Set whether the displayed content is related to the source of the
1176          * corresponding article on the wiki
1177          * Setting true will cause the change "article related" toggle to true
1178          *
1179          * @param bool $v
1180          */
1181         public function setArticleFlag( $v ) {
1182                 $this->mIsarticle = $v;
1183                 if ( $v ) {
1184                         $this->mIsArticleRelated = $v;
1185                 }
1186         }
1187
1188         /**
1189          * Return whether the content displayed page is related to the source of
1190          * the corresponding article on the wiki
1191          *
1192          * @return bool
1193          */
1194         public function isArticle() {
1195                 return $this->mIsarticle;
1196         }
1197
1198         /**
1199          * Set whether this page is related an article on the wiki
1200          * Setting false will cause the change of "article flag" toggle to false
1201          *
1202          * @param bool $v
1203          */
1204         public function setArticleRelated( $v ) {
1205                 $this->mIsArticleRelated = $v;
1206                 if ( !$v ) {
1207                         $this->mIsarticle = false;
1208                 }
1209         }
1210
1211         /**
1212          * Return whether this page is related an article on the wiki
1213          *
1214          * @return bool
1215          */
1216         public function isArticleRelated() {
1217                 return $this->mIsArticleRelated;
1218         }
1219
1220         /**
1221          * Add new language links
1222          *
1223          * @param array $newLinkArray Associative array mapping language code to the page
1224          *                      name
1225          */
1226         public function addLanguageLinks( array $newLinkArray ) {
1227                 $this->mLanguageLinks += $newLinkArray;
1228         }
1229
1230         /**
1231          * Reset the language links and add new language links
1232          *
1233          * @param array $newLinkArray Associative array mapping language code to the page
1234          *                      name
1235          */
1236         public function setLanguageLinks( array $newLinkArray ) {
1237                 $this->mLanguageLinks = $newLinkArray;
1238         }
1239
1240         /**
1241          * Get the list of language links
1242          *
1243          * @return array Array of Interwiki Prefixed (non DB key) Titles (e.g. 'fr:Test page')
1244          */
1245         public function getLanguageLinks() {
1246                 return $this->mLanguageLinks;
1247         }
1248
1249         /**
1250          * Add an array of categories, with names in the keys
1251          *
1252          * @param array $categories Mapping category name => sort key
1253          */
1254         public function addCategoryLinks( array $categories ) {
1255                 global $wgContLang;
1256
1257                 if ( !is_array( $categories ) || count( $categories ) == 0 ) {
1258                         return;
1259                 }
1260
1261                 # Add the links to a LinkBatch
1262                 $arr = [ NS_CATEGORY => $categories ];
1263                 $lb = new LinkBatch;
1264                 $lb->setArray( $arr );
1265
1266                 # Fetch existence plus the hiddencat property
1267                 $dbr = wfGetDB( DB_SLAVE );
1268                 $fields = array_merge(
1269                         LinkCache::getSelectFields(),
1270                         [ 'page_namespace', 'page_title', 'pp_value' ]
1271                 );
1272
1273                 $res = $dbr->select( [ 'page', 'page_props' ],
1274                         $fields,
1275                         $lb->constructSet( 'page', $dbr ),
1276                         __METHOD__,
1277                         [],
1278                         [ 'page_props' => [ 'LEFT JOIN', [
1279                                 'pp_propname' => 'hiddencat',
1280                                 'pp_page = page_id'
1281                         ] ] ]
1282                 );
1283
1284                 # Add the results to the link cache
1285                 $lb->addResultToCache( LinkCache::singleton(), $res );
1286
1287                 # Set all the values to 'normal'.
1288                 $categories = array_fill_keys( array_keys( $categories ), 'normal' );
1289
1290                 # Mark hidden categories
1291                 foreach ( $res as $row ) {
1292                         if ( isset( $row->pp_value ) ) {
1293                                 $categories[$row->page_title] = 'hidden';
1294                         }
1295                 }
1296
1297                 # Add the remaining categories to the skin
1298                 if ( Hooks::run(
1299                         'OutputPageMakeCategoryLinks',
1300                         [ &$this, $categories, &$this->mCategoryLinks ] )
1301                 ) {
1302                         foreach ( $categories as $category => $type ) {
1303                                 // array keys will cast numeric category names to ints, so cast back to string
1304                                 $category = (string)$category;
1305                                 $origcategory = $category;
1306                                 $title = Title::makeTitleSafe( NS_CATEGORY, $category );
1307                                 if ( !$title ) {
1308                                         continue;
1309                                 }
1310                                 $wgContLang->findVariantLink( $category, $title, true );
1311                                 if ( $category != $origcategory && array_key_exists( $category, $categories ) ) {
1312                                         continue;
1313                                 }
1314                                 $text = $wgContLang->convertHtml( $title->getText() );
1315                                 $this->mCategories[] = $title->getText();
1316                                 $this->mCategoryLinks[$type][] = Linker::link( $title, $text );
1317                         }
1318                 }
1319         }
1320
1321         /**
1322          * Reset the category links (but not the category list) and add $categories
1323          *
1324          * @param array $categories Mapping category name => sort key
1325          */
1326         public function setCategoryLinks( array $categories ) {
1327                 $this->mCategoryLinks = [];
1328                 $this->addCategoryLinks( $categories );
1329         }
1330
1331         /**
1332          * Get the list of category links, in a 2-D array with the following format:
1333          * $arr[$type][] = $link, where $type is either "normal" or "hidden" (for
1334          * hidden categories) and $link a HTML fragment with a link to the category
1335          * page
1336          *
1337          * @return array
1338          */
1339         public function getCategoryLinks() {
1340                 return $this->mCategoryLinks;
1341         }
1342
1343         /**
1344          * Get the list of category names this page belongs to
1345          *
1346          * @return array Array of strings
1347          */
1348         public function getCategories() {
1349                 return $this->mCategories;
1350         }
1351
1352         /**
1353          * Add an array of indicators, with their identifiers as array
1354          * keys and HTML contents as values.
1355          *
1356          * In case of duplicate keys, existing values are overwritten.
1357          *
1358          * @param array $indicators
1359          * @since 1.25
1360          */
1361         public function setIndicators( array $indicators ) {
1362                 $this->mIndicators = $indicators + $this->mIndicators;
1363                 // Keep ordered by key
1364                 ksort( $this->mIndicators );
1365         }
1366
1367         /**
1368          * Get the indicators associated with this page.
1369          *
1370          * The array will be internally ordered by item keys.
1371          *
1372          * @return array Keys: identifiers, values: HTML contents
1373          * @since 1.25
1374          */
1375         public function getIndicators() {
1376                 return $this->mIndicators;
1377         }
1378
1379         /**
1380          * Adds help link with an icon via page indicators.
1381          * Link target can be overridden by a local message containing a wikilink:
1382          * the message key is: lowercase action or special page name + '-helppage'.
1383          * @param string $to Target MediaWiki.org page title or encoded URL.
1384          * @param bool $overrideBaseUrl Whether $url is a full URL, to avoid MW.o.
1385          * @since 1.25
1386          */
1387         public function addHelpLink( $to, $overrideBaseUrl = false ) {
1388                 $this->addModuleStyles( 'mediawiki.helplink' );
1389                 $text = $this->msg( 'helppage-top-gethelp' )->escaped();
1390
1391                 if ( $overrideBaseUrl ) {
1392                         $helpUrl = $to;
1393                 } else {
1394                         $toUrlencoded = wfUrlencode( str_replace( ' ', '_', $to ) );
1395                         $helpUrl = "//www.mediawiki.org/wiki/Special:MyLanguage/$toUrlencoded";
1396                 }
1397
1398                 $link = Html::rawElement(
1399                         'a',
1400                         [
1401                                 'href' => $helpUrl,
1402                                 'target' => '_blank',
1403                                 'class' => 'mw-helplink',
1404                         ],
1405                         $text
1406                 );
1407
1408                 $this->setIndicators( [ 'mw-helplink' => $link ] );
1409         }
1410
1411         /**
1412          * Do not allow scripts which can be modified by wiki users to load on this page;
1413          * only allow scripts bundled with, or generated by, the software.
1414          * Site-wide styles are controlled by a config setting, since they can be
1415          * used to create a custom skin/theme, but not user-specific ones.
1416          *
1417          * @todo this should be given a more accurate name
1418          */
1419         public function disallowUserJs() {
1420                 $this->reduceAllowedModules(
1421                         ResourceLoaderModule::TYPE_SCRIPTS,
1422                         ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL
1423                 );
1424
1425                 // Site-wide styles are controlled by a config setting, see bug 71621
1426                 // for background on why. User styles are never allowed.
1427                 if ( $this->getConfig()->get( 'AllowSiteCSSOnRestrictedPages' ) ) {
1428                         $styleOrigin = ResourceLoaderModule::ORIGIN_USER_SITEWIDE;
1429                 } else {
1430                         $styleOrigin = ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL;
1431                 }
1432                 $this->reduceAllowedModules(
1433                         ResourceLoaderModule::TYPE_STYLES,
1434                         $styleOrigin
1435                 );
1436         }
1437
1438         /**
1439          * Show what level of JavaScript / CSS untrustworthiness is allowed on this page
1440          * @see ResourceLoaderModule::$origin
1441          * @param string $type ResourceLoaderModule TYPE_ constant
1442          * @return int ResourceLoaderModule ORIGIN_ class constant
1443          */
1444         public function getAllowedModules( $type ) {
1445                 if ( $type == ResourceLoaderModule::TYPE_COMBINED ) {
1446                         return min( array_values( $this->mAllowedModules ) );
1447                 } else {
1448                         return isset( $this->mAllowedModules[$type] )
1449                                 ? $this->mAllowedModules[$type]
1450                                 : ResourceLoaderModule::ORIGIN_ALL;
1451                 }
1452         }
1453
1454         /**
1455          * Limit the highest level of CSS/JS untrustworthiness allowed.
1456          *
1457          * If passed the same or a higher level than the current level of untrustworthiness set, the
1458          * level will remain unchanged.
1459          *
1460          * @param string $type
1461          * @param int $level ResourceLoaderModule class constant
1462          */
1463         public function reduceAllowedModules( $type, $level ) {
1464                 $this->mAllowedModules[$type] = min( $this->getAllowedModules( $type ), $level );
1465         }
1466
1467         /**
1468          * Prepend $text to the body HTML
1469          *
1470          * @param string $text HTML
1471          */
1472         public function prependHTML( $text ) {
1473                 $this->mBodytext = $text . $this->mBodytext;
1474         }
1475
1476         /**
1477          * Append $text to the body HTML
1478          *
1479          * @param string $text HTML
1480          */
1481         public function addHTML( $text ) {
1482                 $this->mBodytext .= $text;
1483         }
1484
1485         /**
1486          * Shortcut for adding an Html::element via addHTML.
1487          *
1488          * @since 1.19
1489          *
1490          * @param string $element
1491          * @param array $attribs
1492          * @param string $contents
1493          */
1494         public function addElement( $element, array $attribs = [], $contents = '' ) {
1495                 $this->addHTML( Html::element( $element, $attribs, $contents ) );
1496         }
1497
1498         /**
1499          * Clear the body HTML
1500          */
1501         public function clearHTML() {
1502                 $this->mBodytext = '';
1503         }
1504
1505         /**
1506          * Get the body HTML
1507          *
1508          * @return string HTML
1509          */
1510         public function getHTML() {
1511                 return $this->mBodytext;
1512         }
1513
1514         /**
1515          * Get/set the ParserOptions object to use for wikitext parsing
1516          *
1517          * @param ParserOptions|null $options Either the ParserOption to use or null to only get the
1518          *   current ParserOption object
1519          * @return ParserOptions
1520          */
1521         public function parserOptions( $options = null ) {
1522                 if ( $options !== null && !empty( $options->isBogus ) ) {
1523                         // Someone is trying to set a bogus pre-$wgUser PO. Check if it has
1524                         // been changed somehow, and keep it if so.
1525                         $anonPO = ParserOptions::newFromAnon();
1526                         $anonPO->setEditSection( false );
1527                         if ( !$options->matches( $anonPO ) ) {
1528                                 wfLogWarning( __METHOD__ . ': Setting a changed bogus ParserOptions: ' . wfGetAllCallers( 5 ) );
1529                                 $options->isBogus = false;
1530                         }
1531                 }
1532
1533                 if ( !$this->mParserOptions ) {
1534                         if ( !$this->getContext()->getUser()->isSafeToLoad() ) {
1535                                 // $wgUser isn't unstubbable yet, so don't try to get a
1536                                 // ParserOptions for it. And don't cache this ParserOptions
1537                                 // either.
1538                                 $po = ParserOptions::newFromAnon();
1539                                 $po->setEditSection( false );
1540                                 $po->isBogus = true;
1541                                 if ( $options !== null ) {
1542                                         $this->mParserOptions = empty( $options->isBogus ) ? $options : null;
1543                                 }
1544                                 return $po;
1545                         }
1546
1547                         $this->mParserOptions = ParserOptions::newFromContext( $this->getContext() );
1548                         $this->mParserOptions->setEditSection( false );
1549                 }
1550
1551                 if ( $options !== null && !empty( $options->isBogus ) ) {
1552                         // They're trying to restore the bogus pre-$wgUser PO. Do the right
1553                         // thing.
1554                         return wfSetVar( $this->mParserOptions, null, true );
1555                 } else {
1556                         return wfSetVar( $this->mParserOptions, $options );
1557                 }
1558         }
1559
1560         /**
1561          * Set the revision ID which will be seen by the wiki text parser
1562          * for things such as embedded {{REVISIONID}} variable use.
1563          *
1564          * @param int|null $revid An positive integer, or null
1565          * @return mixed Previous value
1566          */
1567         public function setRevisionId( $revid ) {
1568                 $val = is_null( $revid ) ? null : intval( $revid );
1569                 return wfSetVar( $this->mRevisionId, $val );
1570         }
1571
1572         /**
1573          * Get the displayed revision ID
1574          *
1575          * @return int
1576          */
1577         public function getRevisionId() {
1578                 return $this->mRevisionId;
1579         }
1580
1581         /**
1582          * Set the timestamp of the revision which will be displayed. This is used
1583          * to avoid a extra DB call in Skin::lastModified().
1584          *
1585          * @param string|null $timestamp
1586          * @return mixed Previous value
1587          */
1588         public function setRevisionTimestamp( $timestamp ) {
1589                 return wfSetVar( $this->mRevisionTimestamp, $timestamp );
1590         }
1591
1592         /**
1593          * Get the timestamp of displayed revision.
1594          * This will be null if not filled by setRevisionTimestamp().
1595          *
1596          * @return string|null
1597          */
1598         public function getRevisionTimestamp() {
1599                 return $this->mRevisionTimestamp;
1600         }
1601
1602         /**
1603          * Set the displayed file version
1604          *
1605          * @param File|bool $file
1606          * @return mixed Previous value
1607          */
1608         public function setFileVersion( $file ) {
1609                 $val = null;
1610                 if ( $file instanceof File && $file->exists() ) {
1611                         $val = [ 'time' => $file->getTimestamp(), 'sha1' => $file->getSha1() ];
1612                 }
1613                 return wfSetVar( $this->mFileVersion, $val, true );
1614         }
1615
1616         /**
1617          * Get the displayed file version
1618          *
1619          * @return array|null ('time' => MW timestamp, 'sha1' => sha1)
1620          */
1621         public function getFileVersion() {
1622                 return $this->mFileVersion;
1623         }
1624
1625         /**
1626          * Get the templates used on this page
1627          *
1628          * @return array (namespace => dbKey => revId)
1629          * @since 1.18
1630          */
1631         public function getTemplateIds() {
1632                 return $this->mTemplateIds;
1633         }
1634
1635         /**
1636          * Get the files used on this page
1637          *
1638          * @return array (dbKey => array('time' => MW timestamp or null, 'sha1' => sha1 or ''))
1639          * @since 1.18
1640          */
1641         public function getFileSearchOptions() {
1642                 return $this->mImageTimeKeys;
1643         }
1644
1645         /**
1646          * Convert wikitext to HTML and add it to the buffer
1647          * Default assumes that the current page title will be used.
1648          *
1649          * @param string $text
1650          * @param bool $linestart Is this the start of a line?
1651          * @param bool $interface Is this text in the user interface language?
1652          * @throws MWException
1653          */
1654         public function addWikiText( $text, $linestart = true, $interface = true ) {
1655                 $title = $this->getTitle(); // Work around E_STRICT
1656                 if ( !$title ) {
1657                         throw new MWException( 'Title is null' );
1658                 }
1659                 $this->addWikiTextTitle( $text, $title, $linestart, /*tidy*/false, $interface );
1660         }
1661
1662         /**
1663          * Add wikitext with a custom Title object
1664          *
1665          * @param string $text Wikitext
1666          * @param Title $title
1667          * @param bool $linestart Is this the start of a line?
1668          */
1669         public function addWikiTextWithTitle( $text, &$title, $linestart = true ) {
1670                 $this->addWikiTextTitle( $text, $title, $linestart );
1671         }
1672
1673         /**
1674          * Add wikitext with a custom Title object and tidy enabled.
1675          *
1676          * @param string $text Wikitext
1677          * @param Title $title
1678          * @param bool $linestart Is this the start of a line?
1679          */
1680         function addWikiTextTitleTidy( $text, &$title, $linestart = true ) {
1681                 $this->addWikiTextTitle( $text, $title, $linestart, true );
1682         }
1683
1684         /**
1685          * Add wikitext with tidy enabled
1686          *
1687          * @param string $text Wikitext
1688          * @param bool $linestart Is this the start of a line?
1689          */
1690         public function addWikiTextTidy( $text, $linestart = true ) {
1691                 $title = $this->getTitle();
1692                 $this->addWikiTextTitleTidy( $text, $title, $linestart );
1693         }
1694
1695         /**
1696          * Add wikitext with a custom Title object
1697          *
1698          * @param string $text Wikitext
1699          * @param Title $title
1700          * @param bool $linestart Is this the start of a line?
1701          * @param bool $tidy Whether to use tidy
1702          * @param bool $interface Whether it is an interface message
1703          *   (for example disables conversion)
1704          */
1705         public function addWikiTextTitle( $text, Title $title, $linestart,
1706                 $tidy = false, $interface = false
1707         ) {
1708                 global $wgParser;
1709
1710                 $popts = $this->parserOptions();
1711                 $oldTidy = $popts->setTidy( $tidy );
1712                 $popts->setInterfaceMessage( (bool)$interface );
1713
1714                 $parserOutput = $wgParser->getFreshParser()->parse(
1715                         $text, $title, $popts,
1716                         $linestart, true, $this->mRevisionId
1717                 );
1718
1719                 $popts->setTidy( $oldTidy );
1720
1721                 $this->addParserOutput( $parserOutput );
1722
1723         }
1724
1725         /**
1726          * Add a ParserOutput object, but without Html.
1727          *
1728          * @deprecated since 1.24, use addParserOutputMetadata() instead.
1729          * @param ParserOutput $parserOutput
1730          */
1731         public function addParserOutputNoText( $parserOutput ) {
1732                 wfDeprecated( __METHOD__, '1.24' );
1733                 $this->addParserOutputMetadata( $parserOutput );
1734         }
1735
1736         /**
1737          * Add all metadata associated with a ParserOutput object, but without the actual HTML. This
1738          * includes categories, language links, ResourceLoader modules, effects of certain magic words,
1739          * and so on.
1740          *
1741          * @since 1.24
1742          * @param ParserOutput $parserOutput
1743          */
1744         public function addParserOutputMetadata( $parserOutput ) {
1745                 $this->mLanguageLinks += $parserOutput->getLanguageLinks();
1746                 $this->addCategoryLinks( $parserOutput->getCategories() );
1747                 $this->setIndicators( $parserOutput->getIndicators() );
1748                 $this->mNewSectionLink = $parserOutput->getNewSection();
1749                 $this->mHideNewSectionLink = $parserOutput->getHideNewSection();
1750
1751                 if ( !$parserOutput->isCacheable() ) {
1752                         $this->enableClientCache( false );
1753                 }
1754                 $this->mNoGallery = $parserOutput->getNoGallery();
1755                 $this->mHeadItems = array_merge( $this->mHeadItems, $parserOutput->getHeadItems() );
1756                 $this->addModules( $parserOutput->getModules() );
1757                 $this->addModuleScripts( $parserOutput->getModuleScripts() );
1758                 $this->addModuleStyles( $parserOutput->getModuleStyles() );
1759                 $this->addJsConfigVars( $parserOutput->getJsConfigVars() );
1760                 $this->mPreventClickjacking = $this->mPreventClickjacking
1761                         || $parserOutput->preventClickjacking();
1762
1763                 // Template versioning...
1764                 foreach ( (array)$parserOutput->getTemplateIds() as $ns => $dbks ) {
1765                         if ( isset( $this->mTemplateIds[$ns] ) ) {
1766                                 $this->mTemplateIds[$ns] = $dbks + $this->mTemplateIds[$ns];
1767                         } else {
1768                                 $this->mTemplateIds[$ns] = $dbks;
1769                         }
1770                 }
1771                 // File versioning...
1772                 foreach ( (array)$parserOutput->getFileSearchOptions() as $dbk => $data ) {
1773                         $this->mImageTimeKeys[$dbk] = $data;
1774                 }
1775
1776                 // Hooks registered in the object
1777                 $parserOutputHooks = $this->getConfig()->get( 'ParserOutputHooks' );
1778                 foreach ( $parserOutput->getOutputHooks() as $hookInfo ) {
1779                         list( $hookName, $data ) = $hookInfo;
1780                         if ( isset( $parserOutputHooks[$hookName] ) ) {
1781                                 call_user_func( $parserOutputHooks[$hookName], $this, $parserOutput, $data );
1782                         }
1783                 }
1784
1785                 // enable OOUI if requested via ParserOutput
1786                 if ( $parserOutput->getEnableOOUI() ) {
1787                         $this->enableOOUI();
1788                 }
1789
1790                 // Link flags are ignored for now, but may in the future be
1791                 // used to mark individual language links.
1792                 $linkFlags = [];
1793                 Hooks::run( 'LanguageLinks', [ $this->getTitle(), &$this->mLanguageLinks, &$linkFlags ] );
1794                 Hooks::run( 'OutputPageParserOutput', [ &$this, $parserOutput ] );
1795         }
1796
1797         /**
1798          * Add the HTML and enhancements for it (like ResourceLoader modules) associated with a
1799          * ParserOutput object, without any other metadata.
1800          *
1801          * @since 1.24
1802          * @param ParserOutput $parserOutput
1803          */
1804         public function addParserOutputContent( $parserOutput ) {
1805                 $this->addParserOutputText( $parserOutput );
1806
1807                 $this->addModules( $parserOutput->getModules() );
1808                 $this->addModuleScripts( $parserOutput->getModuleScripts() );
1809                 $this->addModuleStyles( $parserOutput->getModuleStyles() );
1810
1811                 $this->addJsConfigVars( $parserOutput->getJsConfigVars() );
1812         }
1813
1814         /**
1815          * Add the HTML associated with a ParserOutput object, without any metadata.
1816          *
1817          * @since 1.24
1818          * @param ParserOutput $parserOutput
1819          */
1820         public function addParserOutputText( $parserOutput ) {
1821                 $text = $parserOutput->getText();
1822                 Hooks::run( 'OutputPageBeforeHTML', [ &$this, &$text ] );
1823                 $this->addHTML( $text );
1824         }
1825
1826         /**
1827          * Add everything from a ParserOutput object.
1828          *
1829          * @param ParserOutput $parserOutput
1830          */
1831         function addParserOutput( $parserOutput ) {
1832                 $this->addParserOutputMetadata( $parserOutput );
1833                 $parserOutput->setTOCEnabled( $this->mEnableTOC );
1834
1835                 // Touch section edit links only if not previously disabled
1836                 if ( $parserOutput->getEditSectionTokens() ) {
1837                         $parserOutput->setEditSectionTokens( $this->mEnableSectionEditLinks );
1838                 }
1839
1840                 $this->addParserOutputText( $parserOutput );
1841         }
1842
1843         /**
1844          * Add the output of a QuickTemplate to the output buffer
1845          *
1846          * @param QuickTemplate $template
1847          */
1848         public function addTemplate( &$template ) {
1849                 $this->addHTML( $template->getHTML() );
1850         }
1851
1852         /**
1853          * Parse wikitext and return the HTML.
1854          *
1855          * @param string $text
1856          * @param bool $linestart Is this the start of a line?
1857          * @param bool $interface Use interface language ($wgLang instead of
1858          *   $wgContLang) while parsing language sensitive magic words like GRAMMAR and PLURAL.
1859          *   This also disables LanguageConverter.
1860          * @param Language $language Target language object, will override $interface
1861          * @throws MWException
1862          * @return string HTML
1863          */
1864         public function parse( $text, $linestart = true, $interface = false, $language = null ) {
1865                 global $wgParser;
1866
1867                 if ( is_null( $this->getTitle() ) ) {
1868                         throw new MWException( 'Empty $mTitle in ' . __METHOD__ );
1869                 }
1870
1871                 $popts = $this->parserOptions();
1872                 if ( $interface ) {
1873                         $popts->setInterfaceMessage( true );
1874                 }
1875                 if ( $language !== null ) {
1876                         $oldLang = $popts->setTargetLanguage( $language );
1877                 }
1878
1879                 $parserOutput = $wgParser->getFreshParser()->parse(
1880                         $text, $this->getTitle(), $popts,
1881                         $linestart, true, $this->mRevisionId
1882                 );
1883
1884                 if ( $interface ) {
1885                         $popts->setInterfaceMessage( false );
1886                 }
1887                 if ( $language !== null ) {
1888                         $popts->setTargetLanguage( $oldLang );
1889                 }
1890
1891                 return $parserOutput->getText();
1892         }
1893
1894         /**
1895          * Parse wikitext, strip paragraphs, and return the HTML.
1896          *
1897          * @param string $text
1898          * @param bool $linestart Is this the start of a line?
1899          * @param bool $interface Use interface language ($wgLang instead of
1900          *   $wgContLang) while parsing language sensitive magic
1901          *   words like GRAMMAR and PLURAL
1902          * @return string HTML
1903          */
1904         public function parseInline( $text, $linestart = true, $interface = false ) {
1905                 $parsed = $this->parse( $text, $linestart, $interface );
1906                 return Parser::stripOuterParagraph( $parsed );
1907         }
1908
1909         /**
1910          * @param $maxage
1911          * @deprecated since 1.27 Use setCdnMaxage() instead
1912          */
1913         public function setSquidMaxage( $maxage ) {
1914                 $this->setCdnMaxage( $maxage );
1915         }
1916
1917         /**
1918          * Set the value of the "s-maxage" part of the "Cache-control" HTTP header
1919          *
1920          * @param int $maxage Maximum cache time on the CDN, in seconds.
1921          */
1922         public function setCdnMaxage( $maxage ) {
1923                 $this->mCdnMaxage = min( $maxage, $this->mCdnMaxageLimit );
1924         }
1925
1926         /**
1927          * Lower the value of the "s-maxage" part of the "Cache-control" HTTP header
1928          *
1929          * @param int $maxage Maximum cache time on the CDN, in seconds
1930          * @since 1.27
1931          */
1932         public function lowerCdnMaxage( $maxage ) {
1933                 $this->mCdnMaxageLimit = min( $maxage, $this->mCdnMaxageLimit );
1934                 $this->setCdnMaxage( $this->mCdnMaxage );
1935         }
1936
1937         /**
1938          * Use enableClientCache(false) to force it to send nocache headers
1939          *
1940          * @param bool $state
1941          *
1942          * @return bool
1943          */
1944         public function enableClientCache( $state ) {
1945                 return wfSetVar( $this->mEnableClientCache, $state );
1946         }
1947
1948         /**
1949          * Get the list of cookies that will influence on the cache
1950          *
1951          * @return array
1952          */
1953         function getCacheVaryCookies() {
1954                 static $cookies;
1955                 if ( $cookies === null ) {
1956                         $config = $this->getConfig();
1957                         $cookies = array_merge(
1958                                 SessionManager::singleton()->getVaryCookies(),
1959                                 [
1960                                         'forceHTTPS',
1961                                 ],
1962                                 $config->get( 'CacheVaryCookies' )
1963                         );
1964                         Hooks::run( 'GetCacheVaryCookies', [ $this, &$cookies ] );
1965                 }
1966                 return $cookies;
1967         }
1968
1969         /**
1970          * Check if the request has a cache-varying cookie header
1971          * If it does, it's very important that we don't allow public caching
1972          *
1973          * @return bool
1974          */
1975         function haveCacheVaryCookies() {
1976                 $request = $this->getRequest();
1977                 foreach ( $this->getCacheVaryCookies() as $cookieName ) {
1978                         if ( $request->getCookie( $cookieName, '', '' ) !== '' ) {
1979                                 wfDebug( __METHOD__ . ": found $cookieName\n" );
1980                                 return true;
1981                         }
1982                 }
1983                 wfDebug( __METHOD__ . ": no cache-varying cookies found\n" );
1984                 return false;
1985         }
1986
1987         /**
1988          * Add an HTTP header that will influence on the cache
1989          *
1990          * @param string $header Header name
1991          * @param string[]|null $option Options for the Key header. See
1992          * https://datatracker.ietf.org/doc/draft-fielding-http-key/
1993          * for the list of valid options.
1994          */
1995         public function addVaryHeader( $header, array $option = null ) {
1996                 if ( !array_key_exists( $header, $this->mVaryHeader ) ) {
1997                         $this->mVaryHeader[$header] = [];
1998                 }
1999                 if ( !is_array( $option ) ) {
2000                         $option = [];
2001                 }
2002                 $this->mVaryHeader[$header] = array_unique( array_merge( $this->mVaryHeader[$header], $option ) );
2003         }
2004
2005         /**
2006          * Return a Vary: header on which to vary caches. Based on the keys of $mVaryHeader,
2007          * such as Accept-Encoding or Cookie
2008          *
2009          * @return string
2010          */
2011         public function getVaryHeader() {
2012                 // If we vary on cookies, let's make sure it's always included here too.
2013                 if ( $this->getCacheVaryCookies() ) {
2014                         $this->addVaryHeader( 'Cookie' );
2015                 }
2016
2017                 foreach ( SessionManager::singleton()->getVaryHeaders() as $header => $options ) {
2018                         $this->addVaryHeader( $header, $options );
2019                 }
2020                 return 'Vary: ' . implode( ', ', array_keys( $this->mVaryHeader ) );
2021         }
2022
2023         /**
2024          * Get a complete Key header
2025          *
2026          * @return string
2027          */
2028         public function getKeyHeader() {
2029                 $cvCookies = $this->getCacheVaryCookies();
2030
2031                 $cookiesOption = [];
2032                 foreach ( $cvCookies as $cookieName ) {
2033                         $cookiesOption[] = 'param=' . $cookieName;
2034                 }
2035                 $this->addVaryHeader( 'Cookie', $cookiesOption );
2036
2037                 foreach ( SessionManager::singleton()->getVaryHeaders() as $header => $options ) {
2038                         $this->addVaryHeader( $header, $options );
2039                 }
2040
2041                 $headers = [];
2042                 foreach ( $this->mVaryHeader as $header => $option ) {
2043                         $newheader = $header;
2044                         if ( is_array( $option ) && count( $option ) > 0 ) {
2045                                 $newheader .= ';' . implode( ';', $option );
2046                         }
2047                         $headers[] = $newheader;
2048                 }
2049                 $key = 'Key: ' . implode( ',', $headers );
2050
2051                 return $key;
2052         }
2053
2054         /**
2055          * T23672: Add Accept-Language to Vary and Key headers
2056          * if there's no 'variant' parameter existed in GET.
2057          *
2058          * For example:
2059          *   /w/index.php?title=Main_page should always be served; but
2060          *   /w/index.php?title=Main_page&variant=zh-cn should never be served.
2061          */
2062         function addAcceptLanguage() {
2063                 $title = $this->getTitle();
2064                 if ( !$title instanceof Title ) {
2065                         return;
2066                 }
2067
2068                 $lang = $title->getPageLanguage();
2069                 if ( !$this->getRequest()->getCheck( 'variant' ) && $lang->hasVariants() ) {
2070                         $variants = $lang->getVariants();
2071                         $aloption = [];
2072                         foreach ( $variants as $variant ) {
2073                                 if ( $variant === $lang->getCode() ) {
2074                                         continue;
2075                                 } else {
2076                                         $aloption[] = 'substr=' . $variant;
2077
2078                                         // IE and some other browsers use BCP 47 standards in
2079                                         // their Accept-Language header, like "zh-CN" or "zh-Hant".
2080                                         // We should handle these too.
2081                                         $variantBCP47 = wfBCP47( $variant );
2082                                         if ( $variantBCP47 !== $variant ) {
2083                                                 $aloption[] = 'substr=' . $variantBCP47;
2084                                         }
2085                                 }
2086                         }
2087                         $this->addVaryHeader( 'Accept-Language', $aloption );
2088                 }
2089         }
2090
2091         /**
2092          * Set a flag which will cause an X-Frame-Options header appropriate for
2093          * edit pages to be sent. The header value is controlled by
2094          * $wgEditPageFrameOptions.
2095          *
2096          * This is the default for special pages. If you display a CSRF-protected
2097          * form on an ordinary view page, then you need to call this function.
2098          *
2099          * @param bool $enable
2100          */
2101         public function preventClickjacking( $enable = true ) {
2102                 $this->mPreventClickjacking = $enable;
2103         }
2104
2105         /**
2106          * Turn off frame-breaking. Alias for $this->preventClickjacking(false).
2107          * This can be called from pages which do not contain any CSRF-protected
2108          * HTML form.
2109          */
2110         public function allowClickjacking() {
2111                 $this->mPreventClickjacking = false;
2112         }
2113
2114         /**
2115          * Get the prevent-clickjacking flag
2116          *
2117          * @since 1.24
2118          * @return bool
2119          */
2120         public function getPreventClickjacking() {
2121                 return $this->mPreventClickjacking;
2122         }
2123
2124         /**
2125          * Get the X-Frame-Options header value (without the name part), or false
2126          * if there isn't one. This is used by Skin to determine whether to enable
2127          * JavaScript frame-breaking, for clients that don't support X-Frame-Options.
2128          *
2129          * @return string
2130          */
2131         public function getFrameOptions() {
2132                 $config = $this->getConfig();
2133                 if ( $config->get( 'BreakFrames' ) ) {
2134                         return 'DENY';
2135                 } elseif ( $this->mPreventClickjacking && $config->get( 'EditPageFrameOptions' ) ) {
2136                         return $config->get( 'EditPageFrameOptions' );
2137                 }
2138                 return false;
2139         }
2140
2141         /**
2142          * Send cache control HTTP headers
2143          */
2144         public function sendCacheControl() {
2145                 $response = $this->getRequest()->response();
2146                 $config = $this->getConfig();
2147
2148                 $this->addVaryHeader( 'Cookie' );
2149                 $this->addAcceptLanguage();
2150
2151                 # don't serve compressed data to clients who can't handle it
2152                 # maintain different caches for logged-in users and non-logged in ones
2153                 $response->header( $this->getVaryHeader() );
2154
2155                 if ( $config->get( 'UseKeyHeader' ) ) {
2156                         $response->header( $this->getKeyHeader() );
2157                 }
2158
2159                 if ( $this->mEnableClientCache ) {
2160                         if (
2161                                 $config->get( 'UseSquid' ) &&
2162                                 !$response->hasCookies() &&
2163                                 !SessionManager::getGlobalSession()->isPersistent() &&
2164                                 !$this->isPrintable() &&
2165                                 $this->mCdnMaxage != 0 &&
2166                                 !$this->haveCacheVaryCookies()
2167                         ) {
2168                                 if ( $config->get( 'UseESI' ) ) {
2169                                         # We'll purge the proxy cache explicitly, but require end user agents
2170                                         # to revalidate against the proxy on each visit.
2171                                         # Surrogate-Control controls our CDN, Cache-Control downstream caches
2172                                         wfDebug( __METHOD__ . ": proxy caching with ESI; {$this->mLastModified} **", 'private' );
2173                                         # start with a shorter timeout for initial testing
2174                                         # header( 'Surrogate-Control: max-age=2678400+2678400, content="ESI/1.0"');
2175                                         $response->header( 'Surrogate-Control: max-age=' . $config->get( 'SquidMaxage' )
2176                                                 . '+' . $this->mCdnMaxage . ', content="ESI/1.0"' );
2177                                         $response->header( 'Cache-Control: s-maxage=0, must-revalidate, max-age=0' );
2178                                 } else {
2179                                         # We'll purge the proxy cache for anons explicitly, but require end user agents
2180                                         # to revalidate against the proxy on each visit.
2181                                         # IMPORTANT! The CDN needs to replace the Cache-Control header with
2182                                         # Cache-Control: s-maxage=0, must-revalidate, max-age=0
2183                                         wfDebug( __METHOD__ . ": local proxy caching; {$this->mLastModified} **", 'private' );
2184                                         # start with a shorter timeout for initial testing
2185                                         # header( "Cache-Control: s-maxage=2678400, must-revalidate, max-age=0" );
2186                                         $response->header( 'Cache-Control: s-maxage=' . $this->mCdnMaxage
2187                                                 . ', must-revalidate, max-age=0' );
2188                                 }
2189                         } else {
2190                                 # We do want clients to cache if they can, but they *must* check for updates
2191                                 # on revisiting the page.
2192                                 wfDebug( __METHOD__ . ": private caching; {$this->mLastModified} **", 'private' );
2193                                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
2194                                 $response->header( "Cache-Control: private, must-revalidate, max-age=0" );
2195                         }
2196                         if ( $this->mLastModified ) {
2197                                 $response->header( "Last-Modified: {$this->mLastModified}" );
2198                         }
2199                 } else {
2200                         wfDebug( __METHOD__ . ": no caching **", 'private' );
2201
2202                         # In general, the absence of a last modified header should be enough to prevent
2203                         # the client from using its cache. We send a few other things just to make sure.
2204                         $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
2205                         $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
2206                         $response->header( 'Pragma: no-cache' );
2207                 }
2208         }
2209
2210         /**
2211          * Finally, all the text has been munged and accumulated into
2212          * the object, let's actually output it:
2213          */
2214         public function output() {
2215                 if ( $this->mDoNothing ) {
2216                         return;
2217                 }
2218
2219                 $response = $this->getRequest()->response();
2220                 $config = $this->getConfig();
2221
2222                 if ( $this->mRedirect != '' ) {
2223                         # Standards require redirect URLs to be absolute
2224                         $this->mRedirect = wfExpandUrl( $this->mRedirect, PROTO_CURRENT );
2225
2226                         $redirect = $this->mRedirect;
2227                         $code = $this->mRedirectCode;
2228
2229                         if ( Hooks::run( "BeforePageRedirect", [ $this, &$redirect, &$code ] ) ) {
2230                                 if ( $code == '301' || $code == '303' ) {
2231                                         if ( !$config->get( 'DebugRedirects' ) ) {
2232                                                 $response->statusHeader( $code );
2233                                         }
2234                                         $this->mLastModified = wfTimestamp( TS_RFC2822 );
2235                                 }
2236                                 if ( $config->get( 'VaryOnXFP' ) ) {
2237                                         $this->addVaryHeader( 'X-Forwarded-Proto' );
2238                                 }
2239                                 $this->sendCacheControl();
2240
2241                                 $response->header( "Content-Type: text/html; charset=utf-8" );
2242                                 if ( $config->get( 'DebugRedirects' ) ) {
2243                                         $url = htmlspecialchars( $redirect );
2244                                         print "<html>\n<head>\n<title>Redirect</title>\n</head>\n<body>\n";
2245                                         print "<p>Location: <a href=\"$url\">$url</a></p>\n";
2246                                         print "</body>\n</html>\n";
2247                                 } else {
2248                                         $response->header( 'Location: ' . $redirect );
2249                                 }
2250                         }
2251
2252                         return;
2253                 } elseif ( $this->mStatusCode ) {
2254                         $response->statusHeader( $this->mStatusCode );
2255                 }
2256
2257                 # Buffer output; final headers may depend on later processing
2258                 ob_start();
2259
2260                 $response->header( 'Content-type: ' . $config->get( 'MimeType' ) . '; charset=UTF-8' );
2261                 $response->header( 'Content-language: ' . $config->get( 'LanguageCode' ) );
2262
2263                 // Avoid Internet Explorer "compatibility view" in IE 8-10, so that
2264                 // jQuery etc. can work correctly.
2265                 $response->header( 'X-UA-Compatible: IE=Edge' );
2266
2267                 // Prevent framing, if requested
2268                 $frameOptions = $this->getFrameOptions();
2269                 if ( $frameOptions ) {
2270                         $response->header( "X-Frame-Options: $frameOptions" );
2271                 }
2272
2273                 if ( $this->mArticleBodyOnly ) {
2274                         echo $this->mBodytext;
2275                 } else {
2276                         $sk = $this->getSkin();
2277                         // add skin specific modules
2278                         $modules = $sk->getDefaultModules();
2279
2280                         // Enforce various default modules for all skins
2281                         $coreModules = [
2282                                 // Keep this list as small as possible
2283                                 'site',
2284                                 'mediawiki.page.startup',
2285                                 'mediawiki.user',
2286                         ];
2287
2288                         // Support for high-density display images if enabled
2289                         if ( $config->get( 'ResponsiveImages' ) ) {
2290                                 $coreModules[] = 'mediawiki.hidpi';
2291                         }
2292
2293                         $this->addModules( $coreModules );
2294                         foreach ( $modules as $group ) {
2295                                 $this->addModules( $group );
2296                         }
2297                         MWDebug::addModules( $this );
2298
2299                         // Hook that allows last minute changes to the output page, e.g.
2300                         // adding of CSS or Javascript by extensions.
2301                         Hooks::run( 'BeforePageDisplay', [ &$this, &$sk ] );
2302
2303                         try {
2304                                 $sk->outputPage();
2305                         } catch ( Exception $e ) {
2306                                 ob_end_clean(); // bug T129657
2307                                 throw $e;
2308                         }
2309                 }
2310
2311                 try {
2312                         // This hook allows last minute changes to final overall output by modifying output buffer
2313                         Hooks::run( 'AfterFinalPageOutput', [ $this ] );
2314                 } catch ( Exception $e ) {
2315                         ob_end_clean(); // bug T129657
2316                         throw $e;
2317                 }
2318
2319                 $this->sendCacheControl();
2320
2321                 ob_end_flush();
2322
2323         }
2324
2325         /**
2326          * Prepare this object to display an error page; disable caching and
2327          * indexing, clear the current text and redirect, set the page's title
2328          * and optionally an custom HTML title (content of the "<title>" tag).
2329          *
2330          * @param string|Message $pageTitle Will be passed directly to setPageTitle()
2331          * @param string|Message $htmlTitle Will be passed directly to setHTMLTitle();
2332          *                   optional, if not passed the "<title>" attribute will be
2333          *                   based on $pageTitle
2334          */
2335         public function prepareErrorPage( $pageTitle, $htmlTitle = false ) {
2336                 $this->setPageTitle( $pageTitle );
2337                 if ( $htmlTitle !== false ) {
2338                         $this->setHTMLTitle( $htmlTitle );
2339                 }
2340                 $this->setRobotPolicy( 'noindex,nofollow' );
2341                 $this->setArticleRelated( false );
2342                 $this->enableClientCache( false );
2343                 $this->mRedirect = '';
2344                 $this->clearSubtitle();
2345                 $this->clearHTML();
2346         }
2347
2348         /**
2349          * Output a standard error page
2350          *
2351          * showErrorPage( 'titlemsg', 'pagetextmsg' );
2352          * showErrorPage( 'titlemsg', 'pagetextmsg', array( 'param1', 'param2' ) );
2353          * showErrorPage( 'titlemsg', $messageObject );
2354          * showErrorPage( $titleMessageObject, $messageObject );
2355          *
2356          * @param string|Message $title Message key (string) for page title, or a Message object
2357          * @param string|Message $msg Message key (string) for page text, or a Message object
2358          * @param array $params Message parameters; ignored if $msg is a Message object
2359          */
2360         public function showErrorPage( $title, $msg, $params = [] ) {
2361                 if ( !$title instanceof Message ) {
2362                         $title = $this->msg( $title );
2363                 }
2364
2365                 $this->prepareErrorPage( $title );
2366
2367                 if ( $msg instanceof Message ) {
2368                         if ( $params !== [] ) {
2369                                 trigger_error( 'Argument ignored: $params. The message parameters argument '
2370                                         . 'is discarded when the $msg argument is a Message object instead of '
2371                                         . 'a string.', E_USER_NOTICE );
2372                         }
2373                         $this->addHTML( $msg->parseAsBlock() );
2374                 } else {
2375                         $this->addWikiMsgArray( $msg, $params );
2376                 }
2377
2378                 $this->returnToMain();
2379         }
2380
2381         /**
2382          * Output a standard permission error page
2383          *
2384          * @param array $errors Error message keys
2385          * @param string $action Action that was denied or null if unknown
2386          */
2387         public function showPermissionsErrorPage( array $errors, $action = null ) {
2388                 // For some action (read, edit, create and upload), display a "login to do this action"
2389                 // error if all of the following conditions are met:
2390                 // 1. the user is not logged in
2391                 // 2. the only error is insufficient permissions (i.e. no block or something else)
2392                 // 3. the error can be avoided simply by logging in
2393                 if ( in_array( $action, [ 'read', 'edit', 'createpage', 'createtalk', 'upload' ] )
2394                         && $this->getUser()->isAnon() && count( $errors ) == 1 && isset( $errors[0][0] )
2395                         && ( $errors[0][0] == 'badaccess-groups' || $errors[0][0] == 'badaccess-group0' )
2396                         && ( User::groupHasPermission( 'user', $action )
2397                         || User::groupHasPermission( 'autoconfirmed', $action ) )
2398                 ) {
2399                         $displayReturnto = null;
2400
2401                         # Due to bug 32276, if a user does not have read permissions,
2402                         # $this->getTitle() will just give Special:Badtitle, which is
2403                         # not especially useful as a returnto parameter. Use the title
2404                         # from the request instead, if there was one.
2405                         $request = $this->getRequest();
2406                         $returnto = Title::newFromText( $request->getVal( 'title', '' ) );
2407                         if ( $action == 'edit' ) {
2408                                 $msg = 'whitelistedittext';
2409                                 $displayReturnto = $returnto;
2410                         } elseif ( $action == 'createpage' || $action == 'createtalk' ) {
2411                                 $msg = 'nocreatetext';
2412                         } elseif ( $action == 'upload' ) {
2413                                 $msg = 'uploadnologintext';
2414                         } else { # Read
2415                                 $msg = 'loginreqpagetext';
2416                                 $displayReturnto = Title::newMainPage();
2417                         }
2418
2419                         $query = [];
2420
2421                         if ( $returnto ) {
2422                                 $query['returnto'] = $returnto->getPrefixedText();
2423
2424                                 if ( !$request->wasPosted() ) {
2425                                         $returntoquery = $request->getValues();
2426                                         unset( $returntoquery['title'] );
2427                                         unset( $returntoquery['returnto'] );
2428                                         unset( $returntoquery['returntoquery'] );
2429                                         $query['returntoquery'] = wfArrayToCgi( $returntoquery );
2430                                 }
2431                         }
2432                         $loginLink = Linker::linkKnown(
2433                                 SpecialPage::getTitleFor( 'Userlogin' ),
2434                                 $this->msg( 'loginreqlink' )->escaped(),
2435                                 [],
2436                                 $query
2437                         );
2438
2439                         $this->prepareErrorPage( $this->msg( 'loginreqtitle' ) );
2440                         $this->addHTML( $this->msg( $msg )->rawParams( $loginLink )->parse() );
2441
2442                         # Don't return to a page the user can't read otherwise
2443                         # we'll end up in a pointless loop
2444                         if ( $displayReturnto && $displayReturnto->userCan( 'read', $this->getUser() ) ) {
2445                                 $this->returnToMain( null, $displayReturnto );
2446                         }
2447                 } else {
2448                         $this->prepareErrorPage( $this->msg( 'permissionserrors' ) );
2449                         $this->addWikiText( $this->formatPermissionsErrorMessage( $errors, $action ) );
2450                 }
2451         }
2452
2453         /**
2454          * Display an error page indicating that a given version of MediaWiki is
2455          * required to use it
2456          *
2457          * @param mixed $version The version of MediaWiki needed to use the page
2458          */
2459         public function versionRequired( $version ) {
2460                 $this->prepareErrorPage( $this->msg( 'versionrequired', $version ) );
2461
2462                 $this->addWikiMsg( 'versionrequiredtext', $version );
2463                 $this->returnToMain();
2464         }
2465
2466         /**
2467          * Format a list of error messages
2468          *
2469          * @param array $errors Array of arrays returned by Title::getUserPermissionsErrors
2470          * @param string $action Action that was denied or null if unknown
2471          * @return string The wikitext error-messages, formatted into a list.
2472          */
2473         public function formatPermissionsErrorMessage( array $errors, $action = null ) {
2474                 if ( $action == null ) {
2475                         $text = $this->msg( 'permissionserrorstext', count( $errors ) )->plain() . "\n\n";
2476                 } else {
2477                         $action_desc = $this->msg( "action-$action" )->plain();
2478                         $text = $this->msg(
2479                                 'permissionserrorstext-withaction',
2480                                 count( $errors ),
2481                                 $action_desc
2482                         )->plain() . "\n\n";
2483                 }
2484
2485                 if ( count( $errors ) > 1 ) {
2486                         $text .= '<ul class="permissions-errors">' . "\n";
2487
2488                         foreach ( $errors as $error ) {
2489                                 $text .= '<li>';
2490                                 $text .= call_user_func_array( [ $this, 'msg' ], $error )->plain();
2491                                 $text .= "</li>\n";
2492                         }
2493                         $text .= '</ul>';
2494                 } else {
2495                         $text .= "<div class=\"permissions-errors\">\n" .
2496                                         call_user_func_array( [ $this, 'msg' ], reset( $errors ) )->plain() .
2497                                         "\n</div>";
2498                 }
2499
2500                 return $text;
2501         }
2502
2503         /**
2504          * Display a page stating that the Wiki is in read-only mode.
2505          * Should only be called after wfReadOnly() has returned true.
2506          *
2507          * Historically, this function was used to show the source of the page that the user
2508          * was trying to edit and _also_ permissions error messages. The relevant code was
2509          * moved into EditPage in 1.19 (r102024 / d83c2a431c2a) and removed here in 1.25.
2510          *
2511          * @deprecated since 1.25; throw the exception directly
2512          * @throws ReadOnlyError
2513          */
2514         public function readOnlyPage() {
2515                 if ( func_num_args() > 0 ) {
2516                         throw new MWException( __METHOD__ . ' no longer accepts arguments since 1.25.' );
2517                 }
2518
2519                 throw new ReadOnlyError;
2520         }
2521
2522         /**
2523          * Turn off regular page output and return an error response
2524          * for when rate limiting has triggered.
2525          *
2526          * @deprecated since 1.25; throw the exception directly
2527          */
2528         public function rateLimited() {
2529                 wfDeprecated( __METHOD__, '1.25' );
2530                 throw new ThrottledError;
2531         }
2532
2533         /**
2534          * Show a warning about slave lag
2535          *
2536          * If the lag is higher than $wgSlaveLagCritical seconds,
2537          * then the warning is a bit more obvious. If the lag is
2538          * lower than $wgSlaveLagWarning, then no warning is shown.
2539          *
2540          * @param int $lag Slave lag
2541          */
2542         public function showLagWarning( $lag ) {
2543                 $config = $this->getConfig();
2544                 if ( $lag >= $config->get( 'SlaveLagWarning' ) ) {
2545                         $message = $lag < $config->get( 'SlaveLagCritical' )
2546                                 ? 'lag-warn-normal'
2547                                 : 'lag-warn-high';
2548                         $wrap = Html::rawElement( 'div', [ 'class' => "mw-{$message}" ], "\n$1\n" );
2549                         $this->wrapWikiMsg( "$wrap\n", [ $message, $this->getLanguage()->formatNum( $lag ) ] );
2550                 }
2551         }
2552
2553         public function showFatalError( $message ) {
2554                 $this->prepareErrorPage( $this->msg( 'internalerror' ) );
2555
2556                 $this->addHTML( $message );
2557         }
2558
2559         public function showUnexpectedValueError( $name, $val ) {
2560                 $this->showFatalError( $this->msg( 'unexpected', $name, $val )->text() );
2561         }
2562
2563         public function showFileCopyError( $old, $new ) {
2564                 $this->showFatalError( $this->msg( 'filecopyerror', $old, $new )->text() );
2565         }
2566
2567         public function showFileRenameError( $old, $new ) {
2568                 $this->showFatalError( $this->msg( 'filerenameerror', $old, $new )->text() );
2569         }
2570
2571         public function showFileDeleteError( $name ) {
2572                 $this->showFatalError( $this->msg( 'filedeleteerror', $name )->text() );
2573         }
2574
2575         public function showFileNotFoundError( $name ) {
2576                 $this->showFatalError( $this->msg( 'filenotfound', $name )->text() );
2577         }
2578
2579         /**
2580          * Add a "return to" link pointing to a specified title
2581          *
2582          * @param Title $title Title to link
2583          * @param array $query Query string parameters
2584          * @param string $text Text of the link (input is not escaped)
2585          * @param array $options Options array to pass to Linker
2586          */
2587         public function addReturnTo( $title, array $query = [], $text = null, $options = [] ) {
2588                 $link = $this->msg( 'returnto' )->rawParams(
2589                         Linker::link( $title, $text, [], $query, $options ) )->escaped();
2590                 $this->addHTML( "<p id=\"mw-returnto\">{$link}</p>\n" );
2591         }
2592
2593         /**
2594          * Add a "return to" link pointing to a specified title,
2595          * or the title indicated in the request, or else the main page
2596          *
2597          * @param mixed $unused
2598          * @param Title|string $returnto Title or String to return to
2599          * @param string $returntoquery Query string for the return to link
2600          */
2601         public function returnToMain( $unused = null, $returnto = null, $returntoquery = null ) {
2602                 if ( $returnto == null ) {
2603                         $returnto = $this->getRequest()->getText( 'returnto' );
2604                 }
2605
2606                 if ( $returntoquery == null ) {
2607                         $returntoquery = $this->getRequest()->getText( 'returntoquery' );
2608                 }
2609
2610                 if ( $returnto === '' ) {
2611                         $returnto = Title::newMainPage();
2612                 }
2613
2614                 if ( is_object( $returnto ) ) {
2615                         $titleObj = $returnto;
2616                 } else {
2617                         $titleObj = Title::newFromText( $returnto );
2618                 }
2619                 if ( !is_object( $titleObj ) ) {
2620                         $titleObj = Title::newMainPage();
2621                 }
2622
2623                 $this->addReturnTo( $titleObj, wfCgiToArray( $returntoquery ) );
2624         }
2625
2626         /**
2627          * @param Skin $sk The given Skin
2628          * @param bool $includeStyle Unused
2629          * @return string The doctype, opening "<html>", and head element.
2630          */
2631         public function headElement( Skin $sk, $includeStyle = true ) {
2632                 global $wgContLang;
2633
2634                 $userdir = $this->getLanguage()->getDir();
2635                 $sitedir = $wgContLang->getDir();
2636
2637                 $pieces = [];
2638                 $pieces[] = Html::htmlHeader( $sk->getHtmlElementAttributes() );
2639
2640                 if ( $this->getHTMLTitle() == '' ) {
2641                         $this->setHTMLTitle( $this->msg( 'pagetitle', $this->getPageTitle() )->inContentLanguage() );
2642                 }
2643
2644                 $openHead = Html::openElement( 'head' );
2645                 if ( $openHead ) {
2646                         $pieces[] = $openHead;
2647                 }
2648
2649                 if ( !Html::isXmlMimeType( $this->getConfig()->get( 'MimeType' ) ) ) {
2650                         // Add <meta charset="UTF-8">
2651                         // This should be before <title> since it defines the charset used by
2652                         // text including the text inside <title>.
2653                         // The spec recommends defining XHTML5's charset using the XML declaration
2654                         // instead of meta.
2655                         // Our XML declaration is output by Html::htmlHeader.
2656                         // http://www.whatwg.org/html/semantics.html#attr-meta-http-equiv-content-type
2657                         // http://www.whatwg.org/html/semantics.html#charset
2658                         $pieces[] = Html::element( 'meta', [ 'charset' => 'UTF-8' ] );
2659                 }
2660
2661                 $pieces[] = Html::element( 'title', null, $this->getHTMLTitle() );
2662                 $pieces[] = $this->getInlineHeadScripts();
2663                 $pieces[] = $this->buildCssLinks();
2664                 $pieces[] = $this->getExternalHeadScripts();
2665
2666                 foreach ( $this->getHeadLinksArray() as $item ) {
2667                         $pieces[] = $item;
2668                 }
2669
2670                 foreach ( $this->mHeadItems as $item ) {
2671                         $pieces[] = $item;
2672                 }
2673
2674                 $closeHead = Html::closeElement( 'head' );
2675                 if ( $closeHead ) {
2676                         $pieces[] = $closeHead;
2677                 }
2678
2679                 $bodyClasses = [];
2680                 $bodyClasses[] = 'mediawiki';
2681
2682                 # Classes for LTR/RTL directionality support
2683                 $bodyClasses[] = $userdir;
2684                 $bodyClasses[] = "sitedir-$sitedir";
2685
2686                 if ( $this->getLanguage()->capitalizeAllNouns() ) {
2687                         # A <body> class is probably not the best way to do this . . .
2688                         $bodyClasses[] = 'capitalize-all-nouns';
2689                 }
2690
2691                 $bodyClasses[] = $sk->getPageClasses( $this->getTitle() );
2692                 $bodyClasses[] = 'skin-' . Sanitizer::escapeClass( $sk->getSkinName() );
2693                 $bodyClasses[] =
2694                         'action-' . Sanitizer::escapeClass( Action::getActionName( $this->getContext() ) );
2695
2696                 $bodyAttrs = [];
2697                 // While the implode() is not strictly needed, it's used for backwards compatibility
2698                 // (this used to be built as a string and hooks likely still expect that).
2699                 $bodyAttrs['class'] = implode( ' ', $bodyClasses );
2700
2701                 // Allow skins and extensions to add body attributes they need
2702                 $sk->addToBodyAttributes( $this, $bodyAttrs );
2703                 Hooks::run( 'OutputPageBodyAttributes', [ $this, $sk, &$bodyAttrs ] );
2704
2705                 $pieces[] = Html::openElement( 'body', $bodyAttrs );
2706
2707                 return WrappedStringList::join( "\n", $pieces );
2708         }
2709
2710         /**
2711          * Get a ResourceLoader object associated with this OutputPage
2712          *
2713          * @return ResourceLoader
2714          */
2715         public function getResourceLoader() {
2716                 if ( is_null( $this->mResourceLoader ) ) {
2717                         $this->mResourceLoader = new ResourceLoader(
2718                                 $this->getConfig(),
2719                                 LoggerFactory::getInstance( 'resourceloader' )
2720                         );
2721                 }
2722                 return $this->mResourceLoader;
2723         }
2724
2725         /**
2726          * Construct neccecary html and loader preset states to load modules on a page.
2727          *
2728          * Use getHtmlFromLoaderLinks() to convert this array to HTML.
2729          *
2730          * @param array|string $modules One or more module names
2731          * @param string $only ResourceLoaderModule TYPE_ class constant
2732          * @param array $extraQuery [optional] Array with extra query parameters for the request
2733          * @return array A list of HTML strings and array of client loader preset states
2734          */
2735         public function makeResourceLoaderLink( $modules, $only, array $extraQuery = [] ) {
2736                 $modules = (array)$modules;
2737
2738                 $links = [
2739                         // List of html strings
2740                         'html' => [],
2741                         // Associative array of module names and their states
2742                         'states' => [],
2743                 ];
2744
2745                 if ( !count( $modules ) ) {
2746                         return $links;
2747                 }
2748
2749                 if ( count( $modules ) > 1 ) {
2750                         // Remove duplicate module requests
2751                         $modules = array_unique( $modules );
2752                         // Sort module names so requests are more uniform
2753                         sort( $modules );
2754
2755                         if ( ResourceLoader::inDebugMode() ) {
2756                                 // Recursively call us for every item
2757                                 foreach ( $modules as $name ) {
2758                                         $link = $this->makeResourceLoaderLink( $name, $only, $extraQuery );
2759                                         $links['html'] = array_merge( $links['html'], $link['html'] );
2760                                         $links['states'] += $link['states'];
2761                                 }
2762                                 return $links;
2763                         }
2764                 }
2765
2766                 if ( !is_null( $this->mTarget ) ) {
2767                         $extraQuery['target'] = $this->mTarget;
2768                 }
2769
2770                 // Create keyed-by-source and then keyed-by-group list of module objects from modules list
2771                 $sortedModules = [];
2772                 $resourceLoader = $this->getResourceLoader();
2773                 foreach ( $modules as $name ) {
2774                         $module = $resourceLoader->getModule( $name );
2775                         # Check that we're allowed to include this module on this page
2776                         if ( !$module
2777                                 || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_SCRIPTS )
2778                                         && $only == ResourceLoaderModule::TYPE_SCRIPTS )
2779                                 || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_STYLES )
2780                                         && $only == ResourceLoaderModule::TYPE_STYLES )
2781                                 || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_COMBINED )
2782                                         && $only == ResourceLoaderModule::TYPE_COMBINED )
2783                                 || ( $this->mTarget && !in_array( $this->mTarget, $module->getTargets() ) )
2784                         ) {
2785                                 continue;
2786                         }
2787
2788                         if ( $only === ResourceLoaderModule::TYPE_STYLES ) {
2789                                 if ( $module->getType() !== ResourceLoaderModule::LOAD_STYLES ) {
2790                                         $logger = $resourceLoader->getLogger();
2791                                         $logger->debug( 'Unexpected general module "{module}" in styles queue.', [
2792                                                 'module' => $name,
2793                                         ] );
2794                                 } else {
2795                                         $links['states'][$name] = 'ready';
2796                                 }
2797                         }
2798
2799                         $sortedModules[$module->getSource()][$module->getGroup()][$name] = $module;
2800                 }
2801
2802                 foreach ( $sortedModules as $source => $groups ) {
2803                         foreach ( $groups as $group => $grpModules ) {
2804                                 // Special handling for user-specific groups
2805                                 $user = null;
2806                                 if ( ( $group === 'user' || $group === 'private' ) && $this->getUser()->isLoggedIn() ) {
2807                                         $user = $this->getUser()->getName();
2808                                 }
2809
2810                                 // Create a fake request based on the one we are about to make so modules return
2811                                 // correct timestamp and emptiness data
2812                                 $query = ResourceLoader::makeLoaderQuery(
2813                                         [], // modules; not determined yet
2814                                         $this->getLanguage()->getCode(),
2815                                         $this->getSkin()->getSkinName(),
2816                                         $user,
2817                                         null, // version; not determined yet
2818                                         ResourceLoader::inDebugMode(),
2819                                         $only === ResourceLoaderModule::TYPE_COMBINED ? null : $only,
2820                                         $this->isPrintable(),
2821                                         $this->getRequest()->getBool( 'handheld' ),
2822                                         $extraQuery
2823                                 );
2824                                 $context = new ResourceLoaderContext( $resourceLoader, new FauxRequest( $query ) );
2825
2826                                 // Extract modules that know they're empty and see if we have one or more
2827                                 // raw modules
2828                                 $isRaw = false;
2829                                 foreach ( $grpModules as $key => $module ) {
2830                                         // Inline empty modules: since they're empty, just mark them as 'ready' (bug 46857)
2831                                         // If we're only getting the styles, we don't need to do anything for empty modules.
2832                                         if ( $module->isKnownEmpty( $context ) ) {
2833                                                 unset( $grpModules[$key] );
2834                                                 if ( $only !== ResourceLoaderModule::TYPE_STYLES ) {
2835                                                         $links['states'][$key] = 'ready';
2836                                                 }
2837                                         }
2838
2839                                         $isRaw |= $module->isRaw();
2840                                 }
2841
2842                                 // If there are no non-empty modules, skip this group
2843                                 if ( count( $grpModules ) === 0 ) {
2844                                         continue;
2845                                 }
2846
2847                                 // Inline private modules. These can't be loaded through load.php for security
2848                                 // reasons, see bug 34907. Note that these modules should be loaded from
2849                                 // getExternalHeadScripts() before the first loader call. Otherwise other modules can't
2850                                 // properly use them as dependencies (bug 30914)
2851                                 if ( $group === 'private' ) {
2852                                         if ( $only == ResourceLoaderModule::TYPE_STYLES ) {
2853                                                 $links['html'][] = Html::inlineStyle(
2854                                                         $resourceLoader->makeModuleResponse( $context, $grpModules )
2855                                                 );
2856                                         } else {
2857                                                 $links['html'][] = ResourceLoader::makeInlineScript(
2858                                                         $resourceLoader->makeModuleResponse( $context, $grpModules )
2859                                                 );
2860                                         }
2861                                         continue;
2862                                 }
2863
2864                                 // Special handling for the user group; because users might change their stuff
2865                                 // on-wiki like user pages, or user preferences; we need to find the highest
2866                                 // timestamp of these user-changeable modules so we can ensure cache misses on change
2867                                 // This should NOT be done for the site group (bug 27564) because anons get that too
2868                                 // and we shouldn't be putting timestamps in CDN-cached HTML
2869                                 $version = null;
2870                                 if ( $group === 'user' ) {
2871                                         $query['version'] = $resourceLoader->getCombinedVersion( $context, array_keys( $grpModules ) );
2872                                 }
2873
2874                                 $query['modules'] = ResourceLoader::makePackedModulesString( array_keys( $grpModules ) );
2875                                 $moduleContext = new ResourceLoaderContext( $resourceLoader, new FauxRequest( $query ) );
2876                                 $url = $resourceLoader->createLoaderURL( $source, $moduleContext, $extraQuery );
2877
2878                                 // Automatically select style/script elements
2879                                 if ( $only === ResourceLoaderModule::TYPE_STYLES ) {
2880                                         $link = Html::linkedStyle( $url );
2881                                 } else {
2882                                         if ( $context->getRaw() || $isRaw ) {
2883                                                 // Startup module can't load itself, needs to use <script> instead of mw.loader.load
2884                                                 $link = Html::element( 'script', [
2885                                                         // In SpecialJavaScriptTest, QUnit must load synchronous
2886                                                         'async' => !isset( $extraQuery['sync'] ),
2887                                                         'src' => $url
2888                                                 ] );
2889                                         } else {
2890                                                 $link = ResourceLoader::makeInlineScript(
2891                                                         Xml::encodeJsCall( 'mw.loader.load', [ $url ] )
2892                                                 );
2893                                         }
2894
2895                                         // For modules requested directly in the html via <script> or mw.loader.load
2896                                         // tell mw.loader they are being loading to prevent duplicate requests.
2897                                         foreach ( $grpModules as $key => $module ) {
2898                                                 // Don't output state=loading for the startup module.
2899                                                 if ( $key !== 'startup' ) {
2900                                                         $links['states'][$key] = 'loading';
2901                                                 }
2902                                         }
2903                                 }
2904
2905                                 if ( $group == 'noscript' ) {
2906                                         $links['html'][] = Html::rawElement( 'noscript', [], $link );
2907                                 } else {
2908                                         $links['html'][] = $link;
2909                                 }
2910                         }
2911                 }
2912
2913                 return $links;
2914         }
2915
2916         /**
2917          * Build html output from an array of links from makeResourceLoaderLink.
2918          * @param array $links
2919          * @return string|WrappedStringList HTML
2920          */
2921         protected static function getHtmlFromLoaderLinks( array $links ) {
2922                 $html = [];
2923                 $states = [];
2924                 foreach ( $links as $link ) {
2925                         if ( !is_array( $link ) ) {
2926                                 $html[] = $link;
2927                         } else {
2928                                 $html = array_merge( $html, $link['html'] );
2929                                 $states += $link['states'];
2930                         }
2931                 }
2932                 // Filter out empty values
2933                 $html = array_filter( $html, 'strlen' );
2934
2935                 if ( $states ) {
2936                         array_unshift( $html, ResourceLoader::makeInlineScript(
2937                                 ResourceLoader::makeLoaderStateScript( $states )
2938                         ) );
2939                 }
2940
2941                 return WrappedString::join( "\n", $html );
2942         }
2943
2944         /**
2945          * JS stuff to put in the "<head>". This is the startup module, config
2946          * vars and modules marked with position 'top'
2947          *
2948          * @return string HTML fragment
2949          */
2950         function getHeadScripts() {
2951                 return $this->getInlineHeadScripts() . $this->getExternalHeadScripts();
2952         }
2953
2954         /**
2955          * <script src="..."> tags for "<head>".This is the startup module
2956          * and other modules marked with position 'top'.
2957          *
2958          * @return string|WrappedStringList HTML
2959          */
2960         function getExternalHeadScripts() {
2961                 // Startup - this provides the client with the module
2962                 // manifest and loads jquery and mediawiki base modules
2963                 $links = [];
2964                 $links[] = $this->makeResourceLoaderLink( 'startup', ResourceLoaderModule::TYPE_SCRIPTS );
2965                 return self::getHtmlFromLoaderLinks( $links );
2966         }
2967
2968         /**
2969          * Inline "<script>" tags to put in "<head>".
2970          *
2971          * @return string|WrappedStringList HTML
2972          */
2973         function getInlineHeadScripts() {
2974                 $links = [];
2975
2976                 // Client profile classes for <html>. Allows for easy hiding/showing of UI components.
2977                 // Must be done synchronously on every page to avoid flashes of wrong content.
2978                 // Note: This class distinguishes MediaWiki-supported JavaScript from the rest.
2979                 // The "rest" includes browsers that support JavaScript but not supported by our runtime.
2980                 // For the performance benefit of the majority, this is added unconditionally here and is
2981                 // then fixed up by the startup module for unsupported browsers.
2982                 $links[] = Html::inlineScript(
2983                         'document.documentElement.className = document.documentElement.className'
2984                         . '.replace( /(^|\s)client-nojs(\s|$)/, "$1client-js$2" );'
2985                 );
2986
2987                 // Load config before anything else
2988                 $links[] = ResourceLoader::makeInlineScript(
2989                         ResourceLoader::makeConfigSetScript( $this->getJSVars() )
2990                 );
2991
2992                 // Load embeddable private modules before any loader links
2993                 // This needs to be TYPE_COMBINED so these modules are properly wrapped
2994                 // in mw.loader.implement() calls and deferred until mw.user is available
2995                 $embedScripts = [ 'user.options' ];
2996                 $links[] = $this->makeResourceLoaderLink(
2997                         $embedScripts,
2998                         ResourceLoaderModule::TYPE_COMBINED
2999                 );
3000                 // Separate user.tokens as otherwise caching will be allowed (T84960)
3001                 $links[] = $this->makeResourceLoaderLink(
3002                         'user.tokens',
3003                         ResourceLoaderModule::TYPE_COMBINED
3004                 );
3005
3006                 // Modules requests - let the client calculate dependencies and batch requests as it likes
3007                 // Only load modules that have marked themselves for loading at the top
3008                 $modules = $this->getModules( true, 'top' );
3009                 if ( $modules ) {
3010                         $links[] = ResourceLoader::makeInlineScript(
3011                                 Xml::encodeJsCall( 'mw.loader.load', [ $modules ] )
3012                         );
3013                 }
3014
3015                 // "Scripts only" modules marked for top inclusion
3016                 $links[] = $this->makeResourceLoaderLink(
3017                         $this->getModuleScripts( true, 'top' ),
3018                         ResourceLoaderModule::TYPE_SCRIPTS
3019                 );
3020
3021                 return self::getHtmlFromLoaderLinks( $links );
3022         }
3023
3024         /**
3025          * JS stuff to put at the 'bottom', which goes at the bottom of the `<body>`.
3026          * These are modules marked with position 'bottom', legacy scripts ($this->mScripts),
3027          * site JS, and user JS.
3028          *
3029          * @param bool $unused Previously used to let this method change its output based
3030          *  on whether it was called by getExternalHeadScripts() or getBottomScripts().
3031          * @return string|WrappedStringList HTML
3032          */
3033         function getScriptsForBottomQueue( $unused = null ) {
3034                 // Scripts "only" requests marked for bottom inclusion
3035                 // If we're in the <head>, use load() calls rather than <script src="..."> tags
3036                 $links = [];
3037
3038                 $links[] = $this->makeResourceLoaderLink( $this->getModuleScripts( true, 'bottom' ),
3039                         ResourceLoaderModule::TYPE_SCRIPTS
3040                 );
3041
3042                 // Modules requests - let the client calculate dependencies and batch requests as it likes
3043                 // Only load modules that have marked themselves for loading at the bottom
3044                 $modules = $this->getModules( true, 'bottom' );
3045                 if ( $modules ) {
3046                         $links[] = ResourceLoader::makeInlineScript(
3047                                 Xml::encodeJsCall( 'mw.loader.load', [ $modules ] )
3048                         );
3049                 }
3050
3051                 // Legacy Scripts
3052                 $links[] = $this->mScripts;
3053
3054                 // Add user JS if enabled
3055                 // This must use TYPE_COMBINED instead of only=scripts so that its request is handled by
3056                 // mw.loader.implement() which ensures that execution is scheduled after the "site" module.
3057                 if ( $this->getConfig()->get( 'AllowUserJs' )
3058                         && $this->getUser()->isLoggedIn()
3059                         && $this->getTitle()
3060                         && $this->getTitle()->isJsSubpage()
3061                         && $this->userCanPreview()
3062                 ) {
3063                         // We're on a preview of a JS subpage. Exclude this page from the user module (T28283)
3064                         // and include the draft contents as a raw script instead.
3065                         $links[] = $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_COMBINED,
3066                                 [ 'excludepage' => $this->getTitle()->getPrefixedDBkey() ]
3067                         );
3068                         // Load the previewed JS
3069                         $links[] = ResourceLoader::makeInlineScript(
3070                                 Xml::encodeJsCall( 'mw.loader.using', [
3071                                         [ 'user', 'site' ],
3072                                         new XmlJsCode(
3073                                                 'function () {'
3074                                                         . Xml::encodeJsCall( '$.globalEval', [
3075                                                                 $this->getRequest()->getText( 'wpTextbox1' )
3076                                                         ] )
3077                                                         . '}'
3078                                         )
3079                                 ] )
3080                         );
3081
3082                         // FIXME: If the user is previewing, say, ./vector.js, his ./common.js will be loaded
3083                         // asynchronously and may arrive *after* the inline script here. So the previewed code
3084                         // may execute before ./common.js runs. Normally, ./common.js runs before ./vector.js.
3085                         // Similarly, when previewing ./common.js and the user module does arrive first,
3086                         // it will arrive without common.js and the inline script runs after.
3087                         // Thus running common after the excluded subpage.
3088                 } else {
3089                         // Include the user module normally, i.e., raw to avoid it being wrapped in a closure.
3090                         $links[] = $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_COMBINED );
3091                 }
3092
3093                 return self::getHtmlFromLoaderLinks( $links );
3094         }
3095
3096         /**
3097          * JS stuff to put at the bottom of the "<body>"
3098          * @return string
3099          */
3100         function getBottomScripts() {
3101                 return $this->getScriptsForBottomQueue();
3102         }
3103
3104         /**
3105          * Get the javascript config vars to include on this page
3106          *
3107          * @return array Array of javascript config vars
3108          * @since 1.23
3109          */
3110         public function getJsConfigVars() {
3111                 return $this->mJsConfigVars;
3112         }
3113
3114         /**
3115          * Add one or more variables to be set in mw.config in JavaScript
3116          *
3117          * @param string|array $keys Key or array of key/value pairs
3118          * @param mixed $value [optional] Value of the configuration variable
3119          */
3120         public function addJsConfigVars( $keys, $value = null ) {
3121                 if ( is_array( $keys ) ) {
3122                         foreach ( $keys as $key => $value ) {
3123                                 $this->mJsConfigVars[$key] = $value;
3124                         }
3125                         return;
3126                 }
3127
3128                 $this->mJsConfigVars[$keys] = $value;
3129         }
3130
3131         /**
3132          * Get an array containing the variables to be set in mw.config in JavaScript.
3133          *
3134          * Do not add things here which can be evaluated in ResourceLoaderStartUpModule
3135          * - in other words, page-independent/site-wide variables (without state).
3136          * You will only be adding bloat to the html page and causing page caches to
3137          * have to be purged on configuration changes.
3138          * @return array
3139          */
3140         public function getJSVars() {
3141                 global $wgContLang;
3142
3143                 $curRevisionId = 0;
3144                 $articleId = 0;
3145                 $canonicalSpecialPageName = false; # bug 21115
3146
3147                 $title = $this->getTitle();
3148                 $ns = $title->getNamespace();
3149                 $canonicalNamespace = MWNamespace::exists( $ns )
3150                         ? MWNamespace::getCanonicalName( $ns )
3151                         : $title->getNsText();
3152
3153                 $sk = $this->getSkin();
3154                 // Get the relevant title so that AJAX features can use the correct page name
3155                 // when making API requests from certain special pages (bug 34972).
3156                 $relevantTitle = $sk->getRelevantTitle();
3157                 $relevantUser = $sk->getRelevantUser();
3158
3159                 if ( $ns == NS_SPECIAL ) {
3160                         list( $canonicalSpecialPageName, /*...*/ ) =
3161                                 SpecialPageFactory::resolveAlias( $title->getDBkey() );
3162                 } elseif ( $this->canUseWikiPage() ) {
3163                         $wikiPage = $this->getWikiPage();
3164                         $curRevisionId = $wikiPage->getLatest();
3165                         $articleId = $wikiPage->getId();
3166                 }
3167
3168                 $lang = $title->getPageViewLanguage();
3169
3170                 // Pre-process information
3171                 $separatorTransTable = $lang->separatorTransformTable();
3172                 $separatorTransTable = $separatorTransTable ? $separatorTransTable : [];
3173                 $compactSeparatorTransTable = [
3174                         implode( "\t", array_keys( $separatorTransTable ) ),
3175                         implode( "\t", $separatorTransTable ),
3176                 ];
3177                 $digitTransTable = $lang->digitTransformTable();
3178                 $digitTransTable = $digitTransTable ? $digitTransTable : [];
3179                 $compactDigitTransTable = [
3180                         implode( "\t", array_keys( $digitTransTable ) ),
3181                         implode( "\t", $digitTransTable ),
3182                 ];
3183
3184                 $user = $this->getUser();
3185
3186                 $vars = [
3187                         'wgCanonicalNamespace' => $canonicalNamespace,
3188                         'wgCanonicalSpecialPageName' => $canonicalSpecialPageName,
3189                         'wgNamespaceNumber' => $title->getNamespace(),
3190                         'wgPageName' => $title->getPrefixedDBkey(),
3191                         'wgTitle' => $title->getText(),
3192                         'wgCurRevisionId' => $curRevisionId,
3193                         'wgRevisionId' => (int)$this->getRevisionId(),
3194                         'wgArticleId' => $articleId,
3195                         'wgIsArticle' => $this->isArticle(),
3196                         'wgIsRedirect' => $title->isRedirect(),
3197                         'wgAction' => Action::getActionName( $this->getContext() ),
3198                         'wgUserName' => $user->isAnon() ? null : $user->getName(),
3199                         'wgUserGroups' => $user->getEffectiveGroups(),
3200                         'wgCategories' => $this->getCategories(),
3201                         'wgBreakFrames' => $this->getFrameOptions() == 'DENY',
3202                         'wgPageContentLanguage' => $lang->getCode(),
3203                         'wgPageContentModel' => $title->getContentModel(),
3204                         'wgSeparatorTransformTable' => $compactSeparatorTransTable,
3205                         'wgDigitTransformTable' => $compactDigitTransTable,
3206                         'wgDefaultDateFormat' => $lang->getDefaultDateFormat(),
3207                         'wgMonthNames' => $lang->getMonthNamesArray(),
3208                         'wgMonthNamesShort' => $lang->getMonthAbbreviationsArray(),
3209                         'wgRelevantPageName' => $relevantTitle->getPrefixedDBkey(),
3210                         'wgRelevantArticleId' => $relevantTitle->getArticleID(),
3211                         'wgRequestId' => WebRequest::getRequestId(),
3212                 ];
3213
3214                 if ( $user->isLoggedIn() ) {
3215                         $vars['wgUserId'] = $user->getId();
3216                         $vars['wgUserEditCount'] = $user->getEditCount();
3217                         $userReg = wfTimestampOrNull( TS_UNIX, $user->getRegistration() );
3218                         $vars['wgUserRegistration'] = $userReg !== null ? ( $userReg * 1000 ) : null;
3219                         // Get the revision ID of the oldest new message on the user's talk
3220                         // page. This can be used for constructing new message alerts on
3221                         // the client side.
3222                         $vars['wgUserNewMsgRevisionId'] = $user->getNewMessageRevisionId();
3223                 }
3224
3225                 if ( $wgContLang->hasVariants() ) {
3226                         $vars['wgUserVariant'] = $wgContLang->getPreferredVariant();
3227                 }
3228                 // Same test as SkinTemplate
3229                 $vars['wgIsProbablyEditable'] = $title->quickUserCan( 'edit', $user )
3230                         && ( $title->exists() || $title->quickUserCan( 'create', $user ) );
3231
3232                 foreach ( $title->getRestrictionTypes() as $type ) {
3233                         $vars['wgRestriction' . ucfirst( $type )] = $title->getRestrictions( $type );
3234                 }
3235
3236                 if ( $title->isMainPage() ) {
3237                         $vars['wgIsMainPage'] = true;
3238                 }
3239
3240                 if ( $this->mRedirectedFrom ) {
3241                         $vars['wgRedirectedFrom'] = $this->mRedirectedFrom->getPrefixedDBkey();
3242                 }
3243
3244                 if ( $relevantUser ) {
3245                         $vars['wgRelevantUserName'] = $relevantUser->getName();
3246                 }
3247
3248                 // Allow extensions to add their custom variables to the mw.config map.
3249                 // Use the 'ResourceLoaderGetConfigVars' hook if the variable is not
3250                 // page-dependant but site-wide (without state).
3251                 // Alternatively, you may want to use OutputPage->addJsConfigVars() instead.
3252                 Hooks::run( 'MakeGlobalVariablesScript', [ &$vars, $this ] );
3253
3254                 // Merge in variables from addJsConfigVars last
3255                 return array_merge( $vars, $this->getJsConfigVars() );
3256         }
3257
3258         /**
3259          * To make it harder for someone to slip a user a fake
3260          * user-JavaScript or user-CSS preview, a random token
3261          * is associated with the login session. If it's not
3262          * passed back with the preview request, we won't render
3263          * the code.
3264          *
3265          * @return bool
3266          */
3267         public function userCanPreview() {
3268                 $request = $this->getRequest();
3269                 if (
3270                         $request->getVal( 'action' ) !== 'submit' ||
3271                         !$request->getCheck( 'wpPreview' ) ||
3272                         !$request->wasPosted()
3273                 ) {
3274                         return false;
3275                 }
3276
3277                 $user = $this->getUser();
3278                 if ( !$user->matchEditToken( $request->getVal( 'wpEditToken' ) ) ) {
3279                         return false;
3280                 }
3281
3282                 $title = $this->getTitle();
3283                 if ( !$title->isJsSubpage() && !$title->isCssSubpage() ) {
3284                         return false;
3285                 }
3286                 if ( !$title->isSubpageOf( $user->getUserPage() ) ) {
3287                         // Don't execute another user's CSS or JS on preview (T85855)
3288                         return false;
3289                 }
3290
3291                 $errors = $title->getUserPermissionsErrors( 'edit', $user );
3292                 if ( count( $errors ) !== 0 ) {
3293                         return false;
3294                 }
3295
3296                 return true;
3297         }
3298
3299         /**
3300          * @return array Array in format "link name or number => 'link html'".
3301          */
3302         public function getHeadLinksArray() {
3303                 global $wgVersion;
3304
3305                 $tags = [];
3306                 $config = $this->getConfig();
3307
3308                 $canonicalUrl = $this->mCanonicalUrl;
3309
3310                 $tags['meta-generator'] = Html::element( 'meta', [
3311                         'name' => 'generator',
3312                         'content' => "MediaWiki $wgVersion",
3313                 ] );
3314
3315                 if ( $config->get( 'ReferrerPolicy' ) !== false ) {
3316                         $tags['meta-referrer'] = Html::element( 'meta', [
3317                                 'name' => 'referrer',
3318                                 'content' => $config->get( 'ReferrerPolicy' )
3319                         ] );
3320                 }
3321
3322                 $p = "{$this->mIndexPolicy},{$this->mFollowPolicy}";
3323                 if ( $p !== 'index,follow' ) {
3324                         // http://www.robotstxt.org/wc/meta-user.html
3325                         // Only show if it's different from the default robots policy
3326                         $tags['meta-robots'] = Html::element( 'meta', [
3327                                 'name' => 'robots',
3328                                 'content' => $p,
3329                         ] );
3330                 }
3331
3332                 foreach ( $this->mMetatags as $tag ) {
3333                         if ( 0 == strcasecmp( 'http:', substr( $tag[0], 0, 5 ) ) ) {
3334                                 $a = 'http-equiv';
3335                                 $tag[0] = substr( $tag[0], 5 );
3336                         } else {
3337                                 $a = 'name';
3338                         }
3339                         $tagName = "meta-{$tag[0]}";
3340                         if ( isset( $tags[$tagName] ) ) {
3341                                 $tagName .= $tag[1];
3342                         }
3343                         $tags[$tagName] = Html::element( 'meta',
3344                                 [
3345                                         $a => $tag[0],
3346                                         'content' => $tag[1]
3347                                 ]
3348                         );
3349                 }
3350
3351                 foreach ( $this->mLinktags as $tag ) {
3352                         $tags[] = Html::element( 'link', $tag );
3353                 }
3354
3355                 # Universal edit button
3356                 if ( $config->get( 'UniversalEditButton' ) && $this->isArticleRelated() ) {
3357                         $user = $this->getUser();
3358                         if ( $this->getTitle()->quickUserCan( 'edit', $user )
3359                                 && ( $this->getTitle()->exists() ||
3360                                         $this->getTitle()->quickUserCan( 'create', $user ) )
3361                         ) {
3362                                 // Original UniversalEditButton
3363                                 $msg = $this->msg( 'edit' )->text();
3364                                 $tags['universal-edit-button'] = Html::element( 'link', [
3365                                         'rel' => 'alternate',
3366                                         'type' => 'application/x-wiki',
3367                                         'title' => $msg,
3368                                         'href' => $this->getTitle()->getEditURL(),
3369                                 ] );
3370                                 // Alternate edit link
3371                                 $tags['alternative-edit'] = Html::element( 'link', [
3372                                         'rel' => 'edit',
3373                                         'title' => $msg,
3374                                         'href' => $this->getTitle()->getEditURL(),
3375                                 ] );
3376                         }
3377                 }
3378
3379                 # Generally the order of the favicon and apple-touch-icon links
3380                 # should not matter, but Konqueror (3.5.9 at least) incorrectly
3381                 # uses whichever one appears later in the HTML source. Make sure
3382                 # apple-touch-icon is specified first to avoid this.
3383                 if ( $config->get( 'AppleTouchIcon' ) !== false ) {
3384                         $tags['apple-touch-icon'] = Html::element( 'link', [
3385                                 'rel' => 'apple-touch-icon',
3386                                 'href' => $config->get( 'AppleTouchIcon' )
3387                         ] );
3388                 }
3389
3390                 if ( $config->get( 'Favicon' ) !== false ) {
3391                         $tags['favicon'] = Html::element( 'link', [
3392                                 'rel' => 'shortcut icon',
3393                                 'href' => $config->get( 'Favicon' )
3394                         ] );
3395                 }
3396
3397                 # OpenSearch description link
3398                 $tags['opensearch'] = Html::element( 'link', [
3399                         'rel' => 'search',
3400                         'type' => 'application/opensearchdescription+xml',
3401                         'href' => wfScript( 'opensearch_desc' ),
3402                         'title' => $this->msg( 'opensearch-desc' )->inContentLanguage()->text(),
3403                 ] );
3404
3405                 if ( $config->get( 'EnableAPI' ) ) {
3406                         # Real Simple Discovery link, provides auto-discovery information
3407                         # for the MediaWiki API (and potentially additional custom API
3408                         # support such as WordPress or Twitter-compatible APIs for a
3409                         # blogging extension, etc)
3410                         $tags['rsd'] = Html::element( 'link', [
3411                                 'rel' => 'EditURI',
3412                                 'type' => 'application/rsd+xml',
3413                                 // Output a protocol-relative URL here if $wgServer is protocol-relative.
3414                                 // Whether RSD accepts relative or protocol-relative URLs is completely
3415                                 // undocumented, though.
3416                                 'href' => wfExpandUrl( wfAppendQuery(
3417                                         wfScript( 'api' ),
3418                                         [ 'action' => 'rsd' ] ),
3419                                         PROTO_RELATIVE
3420                                 ),
3421                         ] );
3422                 }
3423
3424                 # Language variants
3425                 if ( !$config->get( 'DisableLangConversion' ) ) {
3426                         $lang = $this->getTitle()->getPageLanguage();
3427                         if ( $lang->hasVariants() ) {
3428                                 $variants = $lang->getVariants();
3429                                 foreach ( $variants as $variant ) {
3430                                         $tags["variant-$variant"] = Html::element( 'link', [
3431                                                 'rel' => 'alternate',
3432                                                 'hreflang' => wfBCP47( $variant ),
3433                                                 'href' => $this->getTitle()->getLocalURL(
3434                                                         [ 'variant' => $variant ] )
3435                                                 ]
3436                                         );
3437                                 }
3438                                 # x-default link per https://support.google.com/webmasters/answer/189077?hl=en
3439                                 $tags["variant-x-default"] = Html::element( 'link', [
3440                                         'rel' => 'alternate',
3441                                         'hreflang' => 'x-default',
3442                                         'href' => $this->getTitle()->getLocalURL() ] );
3443                         }
3444                 }
3445
3446                 # Copyright
3447                 if ( $this->copyrightUrl !== null ) {
3448                         $copyright = $this->copyrightUrl;
3449                 } else {
3450                         $copyright = '';
3451                         if ( $config->get( 'RightsPage' ) ) {
3452                                 $copy = Title::newFromText( $config->get( 'RightsPage' ) );
3453
3454                                 if ( $copy ) {
3455                                         $copyright = $copy->getLocalURL();
3456                                 }
3457                         }
3458
3459                         if ( !$copyright && $config->get( 'RightsUrl' ) ) {
3460                                 $copyright = $config->get( 'RightsUrl' );
3461                         }
3462                 }
3463
3464                 if ( $copyright ) {
3465                         $tags['copyright'] = Html::element( 'link', [
3466                                 'rel' => 'copyright',
3467                                 'href' => $copyright ]
3468                         );
3469                 }
3470
3471                 # Feeds
3472                 if ( $config->get( 'Feed' ) ) {
3473                         $feedLinks = [];
3474
3475                         foreach ( $this->getSyndicationLinks() as $format => $link ) {
3476                                 # Use the page name for the title.  In principle, this could
3477                                 # lead to issues with having the same name for different feeds
3478                                 # corresponding to the same page, but we can't avoid that at
3479                                 # this low a level.
3480
3481                                 $feedLinks[] = $this->feedLink(
3482                                         $format,
3483                                         $link,
3484                                         # Used messages: 'page-rss-feed' and 'page-atom-feed' (for an easier grep)
3485                                         $this->msg(
3486                                                 "page-{$format}-feed", $this->getTitle()->getPrefixedText()
3487                                         )->text()
3488                                 );
3489                         }
3490
3491                         # Recent changes feed should appear on every page (except recentchanges,
3492                         # that would be redundant). Put it after the per-page feed to avoid
3493                         # changing existing behavior. It's still available, probably via a
3494                         # menu in your browser. Some sites might have a different feed they'd
3495                         # like to promote instead of the RC feed (maybe like a "Recent New Articles"
3496                         # or "Breaking news" one). For this, we see if $wgOverrideSiteFeed is defined.
3497                         # If so, use it instead.
3498                         $sitename = $config->get( 'Sitename' );
3499                         if ( $config->get( 'OverrideSiteFeed' ) ) {
3500                                 foreach ( $config->get( 'OverrideSiteFeed' ) as $type => $feedUrl ) {
3501                                         // Note, this->feedLink escapes the url.
3502                                         $feedLinks[] = $this->feedLink(
3503                                                 $type,
3504                                                 $feedUrl,
3505                                                 $this->msg( "site-{$type}-feed", $sitename )->text()
3506                                         );
3507                                 }
3508                         } elseif ( !$this->getTitle()->isSpecial( 'Recentchanges' ) ) {
3509                                 $rctitle = SpecialPage::getTitleFor( 'Recentchanges' );
3510                                 foreach ( $config->get( 'AdvertisedFeedTypes' ) as $format ) {
3511                                         $feedLinks[] = $this->feedLink(
3512                                                 $format,
3513                                                 $rctitle->getLocalURL( [ 'feed' => $format ] ),
3514                                                 # For grep: 'site-rss-feed', 'site-atom-feed'
3515                                                 $this->msg( "site-{$format}-feed", $sitename )->text()
3516                                         );
3517                                 }
3518                         }
3519
3520                         # Allow extensions to change the list pf feeds. This hook is primarily for changing,
3521                         # manipulating or removing existing feed tags. If you want to add new feeds, you should
3522                         # use OutputPage::addFeedLink() instead.
3523                         Hooks::run( 'AfterBuildFeedLinks', [ &$feedLinks ] );
3524
3525                         $tags += $feedLinks;
3526                 }
3527
3528                 # Canonical URL
3529                 if ( $config->get( 'EnableCanonicalServerLink' ) ) {
3530                         if ( $canonicalUrl !== false ) {
3531                                 $canonicalUrl = wfExpandUrl( $canonicalUrl, PROTO_CANONICAL );
3532                         } else {
3533                                 if ( $this->isArticleRelated() ) {
3534                                         // This affects all requests where "setArticleRelated" is true. This is
3535                                         // typically all requests that show content (query title, curid, oldid, diff),
3536                                         // and all wikipage actions (edit, delete, purge, info, history etc.).
3537                                         // It does not apply to File pages and Special pages.
3538                                         // 'history' and 'info' actions address page metadata rather than the page
3539                                         // content itself, so they may not be canonicalized to the view page url.
3540                                         // TODO: this ought to be better encapsulated in the Action class.
3541                                         $action = Action::getActionName( $this->getContext() );
3542                                         if ( in_array( $action, [ 'history', 'info' ] ) ) {
3543                                                 $query = "action={$action}";
3544                                         } else {
3545                                                 $query = '';
3546                                         }
3547                                         $canonicalUrl = $this->getTitle()->getCanonicalURL( $query );
3548                                 } else {
3549                                         $reqUrl = $this->getRequest()->getRequestURL();
3550                                         $canonicalUrl = wfExpandUrl( $reqUrl, PROTO_CANONICAL );
3551                                 }
3552                         }
3553                 }
3554                 if ( $canonicalUrl !== false ) {
3555                         $tags[] = Html::element( 'link', [
3556                                 'rel' => 'canonical',
3557                                 'href' => $canonicalUrl
3558                         ] );
3559                 }
3560
3561                 return $tags;
3562         }
3563
3564         /**
3565          * @return string HTML tag links to be put in the header.
3566          * @deprecated since 1.24 Use OutputPage::headElement or if you have to,
3567          *   OutputPage::getHeadLinksArray directly.
3568          */
3569         public function getHeadLinks() {
3570                 wfDeprecated( __METHOD__, '1.24' );
3571                 return implode( "\n", $this->getHeadLinksArray() );
3572         }
3573
3574         /**
3575          * Generate a "<link rel/>" for a feed.
3576          *
3577          * @param string $type Feed type
3578          * @param string $url URL to the feed
3579          * @param string $text Value of the "title" attribute
3580          * @return string HTML fragment
3581          */
3582         private function feedLink( $type, $url, $text ) {
3583                 return Html::element( 'link', [
3584                         'rel' => 'alternate',
3585                         'type' => "application/$type+xml",
3586                         'title' => $text,
3587                         'href' => $url ]
3588                 );
3589         }
3590
3591         /**
3592          * Add a local or specified stylesheet, with the given media options.
3593          * Internal use only. Use OutputPage::addModuleStyles() if possible.
3594          *
3595          * @param string $style URL to the file
3596          * @param string $media To specify a media type, 'screen', 'printable', 'handheld' or any.
3597          * @param string $condition For IE conditional comments, specifying an IE version
3598          * @param string $dir Set to 'rtl' or 'ltr' for direction-specific sheets
3599          */
3600         public function addStyle( $style, $media = '', $condition = '', $dir = '' ) {
3601                 $options = [];
3602                 if ( $media ) {
3603                         $options['media'] = $media;
3604                 }
3605                 if ( $condition ) {
3606                         $options['condition'] = $condition;
3607                 }
3608                 if ( $dir ) {
3609                         $options['dir'] = $dir;
3610                 }
3611                 $this->styles[$style] = $options;
3612         }
3613
3614         /**
3615          * Adds inline CSS styles
3616          * Internal use only. Use OutputPage::addModuleStyles() if possible.
3617          *
3618          * @param mixed $style_css Inline CSS
3619          * @param string $flip Set to 'flip' to flip the CSS if needed
3620          */
3621         public function addInlineStyle( $style_css, $flip = 'noflip' ) {
3622                 if ( $flip === 'flip' && $this->getLanguage()->isRTL() ) {
3623                         # If wanted, and the interface is right-to-left, flip the CSS
3624                         $style_css = CSSJanus::transform( $style_css, true, false );
3625                 }
3626                 $this->mInlineStyles .= Html::inlineStyle( $style_css );
3627         }
3628
3629         /**
3630          * Build a set of "<link>" elements for stylesheets specified in the $this->styles array.
3631          *
3632          * @return string|WrappedStringList HTML
3633          */
3634         public function buildCssLinks() {
3635                 global $wgContLang;
3636
3637                 $this->getSkin()->setupSkinUserCss( $this );
3638
3639                 // Add ResourceLoader styles
3640                 // Split the styles into these groups
3641                 $styles = [
3642                         'other' => [],
3643                         'user' => [],
3644                         'site' => [],
3645                         'private' => [],
3646                         'noscript' => []
3647                 ];
3648                 $links = [];
3649                 $otherTags = []; // Tags to append after the normal <link> tags
3650                 $resourceLoader = $this->getResourceLoader();
3651
3652                 $moduleStyles = $this->getModuleStyles();
3653
3654                 // Per-site custom styles
3655                 $moduleStyles[] = 'site.styles';
3656                 $moduleStyles[] = 'noscript';
3657
3658                 // Per-user custom styles
3659                 if ( $this->getConfig()->get( 'AllowUserCss' ) && $this->getTitle()->isCssSubpage()
3660                         && $this->userCanPreview()
3661                 ) {
3662                         // We're on a preview of a CSS subpage
3663                         // Exclude this page from the user module in case it's in there (bug 26283)
3664                         $link = $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_STYLES,
3665                                 [ 'excludepage' => $this->getTitle()->getPrefixedDBkey() ]
3666                         );
3667                         $otherTags = array_merge( $otherTags, $link['html'] );
3668
3669                         // Load the previewed CSS
3670                         // If needed, Janus it first. This is user-supplied CSS, so it's
3671                         // assumed to be right for the content language directionality.
3672                         $previewedCSS = $this->getRequest()->getText( 'wpTextbox1' );
3673                         if ( $this->getLanguage()->getDir() !== $wgContLang->getDir() ) {
3674                                 $previewedCSS = CSSJanus::transform( $previewedCSS, true, false );
3675                         }
3676                         $otherTags[] = Html::inlineStyle( $previewedCSS );
3677                 } else {
3678                         // Load the user styles normally
3679                         $moduleStyles[] = 'user';
3680                 }
3681
3682                 // Per-user preference styles
3683                 $moduleStyles[] = 'user.cssprefs';
3684
3685                 foreach ( $moduleStyles as $name ) {
3686                         $module = $resourceLoader->getModule( $name );
3687                         if ( !$module ) {
3688                                 continue;
3689                         }
3690                         if ( $name === 'site.styles' ) {
3691                                 // HACK: The site module shouldn't be fragmented with a cache group and
3692                                 // http request. But in order to ensure its styles are separated and after the
3693                                 // ResourceLoaderDynamicStyles marker, pretend it is in a group called 'site'.
3694                                 // The scripts remain ungrouped and rides the bottom queue.
3695                                 $styles['site'][] = $name;
3696                                 continue;
3697                         }
3698                         $group = $module->getGroup();
3699                         // Modules in groups other than the ones needing special treatment
3700                         // (see $styles assignment)
3701                         // will be placed in the "other" style category.
3702                         $styles[isset( $styles[$group] ) ? $group : 'other'][] = $name;
3703                 }
3704
3705                 // We want site, private and user styles to override dynamically added
3706                 // styles from modules, but we want dynamically added styles to override
3707                 // statically added styles from other modules. So the order has to be
3708                 // other, dynamic, site, private, user. Add statically added styles for
3709                 // other modules
3710                 $links[] = $this->makeResourceLoaderLink(
3711                         $styles['other'],
3712                         ResourceLoaderModule::TYPE_STYLES
3713                 );
3714                 // Add normal styles added through addStyle()/addInlineStyle() here
3715                 $links[] = implode( '', $this->buildCssLinksArray() ) . $this->mInlineStyles;
3716                 // Add marker tag to mark the place where the client-side
3717                 // loader should inject dynamic styles
3718                 // We use a <meta> tag with a made-up name for this because that's valid HTML
3719                 $links[] = Html::element(
3720                         'meta',
3721                         [ 'name' => 'ResourceLoaderDynamicStyles', 'content' => '' ]
3722                 );
3723
3724                 // Add site-specific and user-specific styles
3725                 // 'private' at present only contains user.options, so put that before 'user'
3726                 // Any future private modules will likely have a similar user-specific character
3727                 foreach ( [ 'site', 'noscript', 'private', 'user' ] as $group ) {
3728                         $links[] = $this->makeResourceLoaderLink( $styles[$group],
3729                                 ResourceLoaderModule::TYPE_STYLES
3730                         );
3731                 }
3732
3733                 // Add stuff in $otherTags (previewed user CSS if applicable)
3734                 $links[] = implode( '', $otherTags );
3735
3736                 return self::getHtmlFromLoaderLinks( $links );
3737         }
3738
3739         /**
3740          * @return array
3741          */
3742         public function buildCssLinksArray() {
3743                 $links = [];
3744
3745                 // Add any extension CSS
3746                 foreach ( $this->mExtStyles as $url ) {
3747                         $this->addStyle( $url );
3748                 }
3749                 $this->mExtStyles = [];
3750
3751                 foreach ( $this->styles as $file => $options ) {
3752                         $link = $this->styleLink( $file, $options );
3753                         if ( $link ) {
3754                                 $links[$file] = $link;
3755                         }
3756                 }
3757                 return $links;
3758         }
3759
3760         /**
3761          * Generate \<link\> tags for stylesheets
3762          *
3763          * @param string $style URL to the file
3764          * @param array $options Option, can contain 'condition', 'dir', 'media' keys
3765          * @return string HTML fragment
3766          */
3767         protected function styleLink( $style, array $options ) {
3768                 if ( isset( $options['dir'] ) ) {
3769                         if ( $this->getLanguage()->getDir() != $options['dir'] ) {
3770                                 return '';
3771                         }
3772                 }
3773
3774                 if ( isset( $options['media'] ) ) {
3775                         $media = self::transformCssMedia( $options['media'] );
3776                         if ( is_null( $media ) ) {
3777                                 return '';
3778                         }
3779                 } else {
3780                         $media = 'all';
3781                 }
3782
3783                 if ( substr( $style, 0, 1 ) == '/' ||
3784                         substr( $style, 0, 5 ) == 'http:' ||
3785                         substr( $style, 0, 6 ) == 'https:' ) {
3786                         $url = $style;
3787                 } else {
3788                         $config = $this->getConfig();
3789                         $url = $config->get( 'StylePath' ) . '/' . $style . '?' .
3790                                 $config->get( 'StyleVersion' );
3791                 }
3792
3793                 $link = Html::linkedStyle( $url, $media );
3794
3795                 if ( isset( $options['condition'] ) ) {
3796                         $condition = htmlspecialchars( $options['condition'] );
3797                         $link = "<!--[if $condition]>$link<![endif]-->";
3798                 }
3799                 return $link;
3800         }
3801
3802         /**
3803          * Transform path to web-accessible static resource.
3804          *
3805          * This is used to add a validation hash as query string.
3806          * This aids various behaviors:
3807          *
3808          * - Put long Cache-Control max-age headers on responses for improved
3809          *   cache performance.
3810          * - Get the correct version of a file as expected by the current page.
3811          * - Instantly get the updated version of a file after deployment.
3812          *
3813          * Avoid using this for urls included in HTML as otherwise clients may get different
3814          * versions of a resource when navigating the site depending on when the page was cached.
3815          * If changes to the url propagate, this is not a problem (e.g. if the url is in
3816          * an external stylesheet).
3817          *
3818          * @since 1.27
3819          * @param Config $config
3820          * @param string $path Path-absolute URL to file (from document root, must start with "/")
3821          * @return string URL
3822          */
3823         public static function transformResourcePath( Config $config, $path ) {
3824                 global $IP;
3825                 $remotePathPrefix = $config->get( 'ResourceBasePath' );
3826                 if ( $remotePathPrefix === '' ) {
3827                         // The configured base path is required to be empty string for
3828                         // wikis in the domain root
3829                         $remotePath = '/';
3830                 } else {
3831                         $remotePath = $remotePathPrefix;
3832                 }
3833                 if ( strpos( $path, $remotePath ) !== 0 ) {
3834                         // Path is outside wgResourceBasePath, ignore.
3835                         return $path;
3836                 }
3837                 $path = RelPath\getRelativePath( $path, $remotePath );
3838                 return self::transformFilePath( $remotePathPrefix, $IP, $path );
3839         }
3840
3841         /**
3842          * Utility method for transformResourceFilePath().
3843          *
3844          * Caller is responsible for ensuring the file exists. Emits a PHP warning otherwise.
3845          *
3846          * @since 1.27
3847          * @param string $remotePath URL path prefix that points to $localPath
3848          * @param string $localPath File directory exposed at $remotePath
3849          * @param string $file Path to target file relative to $localPath
3850          * @return string URL
3851          */
3852         public static function transformFilePath( $remotePathPrefix, $localPath, $file ) {
3853                 $hash = md5_file( "$localPath/$file" );
3854                 if ( $hash === false ) {
3855                         wfLogWarning( __METHOD__ . ": Failed to hash $localPath/$file" );
3856                         $hash = '';
3857                 }
3858                 return "$remotePathPrefix/$file?" . substr( $hash, 0, 5 );
3859         }
3860
3861         /**
3862          * Transform "media" attribute based on request parameters
3863          *
3864          * @param string $media Current value of the "media" attribute
3865          * @return string Modified value of the "media" attribute, or null to skip
3866          * this stylesheet
3867          */
3868         public static function transformCssMedia( $media ) {
3869                 global $wgRequest;
3870
3871                 // http://www.w3.org/TR/css3-mediaqueries/#syntax
3872                 $screenMediaQueryRegex = '/^(?:only\s+)?screen\b/i';
3873
3874                 // Switch in on-screen display for media testing
3875                 $switches = [
3876                         'printable' => 'print',
3877                         'handheld' => 'handheld',
3878                 ];
3879                 foreach ( $switches as $switch => $targetMedia ) {
3880                         if ( $wgRequest->getBool( $switch ) ) {
3881                                 if ( $media == $targetMedia ) {
3882                                         $media = '';
3883                                 } elseif ( preg_match( $screenMediaQueryRegex, $media ) === 1 ) {
3884                                         /* This regex will not attempt to understand a comma-separated media_query_list
3885                                          *
3886                                          * Example supported values for $media:
3887                                          * 'screen', 'only screen', 'screen and (min-width: 982px)' ),
3888                                          * Example NOT supported value for $media:
3889                                          * '3d-glasses, screen, print and resolution > 90dpi'
3890                                          *
3891                                          * If it's a print request, we never want any kind of screen stylesheets
3892                                          * If it's a handheld request (currently the only other choice with a switch),
3893                                          * we don't want simple 'screen' but we might want screen queries that
3894                                          * have a max-width or something, so we'll pass all others on and let the
3895                                          * client do the query.
3896                                          */
3897                                         if ( $targetMedia == 'print' || $media == 'screen' ) {
3898                                                 return null;
3899                                         }
3900                                 }
3901                         }
3902                 }
3903
3904                 return $media;
3905         }
3906
3907         /**
3908          * Add a wikitext-formatted message to the output.
3909          * This is equivalent to:
3910          *
3911          *    $wgOut->addWikiText( wfMessage( ... )->plain() )
3912          */
3913         public function addWikiMsg( /*...*/ ) {
3914                 $args = func_get_args();
3915                 $name = array_shift( $args );
3916                 $this->addWikiMsgArray( $name, $args );
3917         }
3918
3919         /**
3920          * Add a wikitext-formatted message to the output.
3921          * Like addWikiMsg() except the parameters are taken as an array
3922          * instead of a variable argument list.
3923          *
3924          * @param string $name
3925          * @param array $args
3926          */
3927         public function addWikiMsgArray( $name, $args ) {
3928                 $this->addHTML( $this->msg( $name, $args )->parseAsBlock() );
3929         }
3930
3931         /**
3932          * This function takes a number of message/argument specifications, wraps them in
3933          * some overall structure, and then parses the result and adds it to the output.
3934          *
3935          * In the $wrap, $1 is replaced with the first message, $2 with the second,
3936          * and so on. The subsequent arguments may be either
3937          * 1) strings, in which case they are message names, or
3938          * 2) arrays, in which case, within each array, the first element is the message
3939          *    name, and subsequent elements are the parameters to that message.
3940          *
3941          * Don't use this for messages that are not in the user's interface language.
3942          *
3943          * For example:
3944          *
3945          *    $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>", 'some-error' );
3946          *
3947          * Is equivalent to:
3948          *
3949          *    $wgOut->addWikiText( "<div class='error'>\n"
3950          *        . wfMessage( 'some-error' )->plain() . "\n</div>" );
3951          *
3952          * The newline after the opening div is needed in some wikitext. See bug 19226.
3953          *
3954          * @param string $wrap
3955          */
3956         public function wrapWikiMsg( $wrap /*, ...*/ ) {
3957                 $msgSpecs = func_get_args();
3958                 array_shift( $msgSpecs );
3959                 $msgSpecs = array_values( $msgSpecs );
3960                 $s = $wrap;
3961                 foreach ( $msgSpecs as $n => $spec ) {
3962                         if ( is_array( $spec ) ) {
3963                                 $args = $spec;
3964                                 $name = array_shift( $args );
3965                                 if ( isset( $args['options'] ) ) {
3966                                         unset( $args['options'] );
3967                                         wfDeprecated(
3968                                                 'Adding "options" to ' . __METHOD__ . ' is no longer supported',
3969                                                 '1.20'
3970                                         );
3971                                 }
3972                         } else {
3973                                 $args = [];
3974                                 $name = $spec;
3975                         }
3976                         $s = str_replace( '$' . ( $n + 1 ), $this->msg( $name, $args )->plain(), $s );
3977                 }
3978                 $this->addWikiText( $s );
3979         }
3980
3981         /**
3982          * Enables/disables TOC, doesn't override __NOTOC__
3983          * @param bool $flag
3984          * @since 1.22
3985          */
3986         public function enableTOC( $flag = true ) {
3987                 $this->mEnableTOC = $flag;
3988         }
3989
3990         /**
3991          * @return bool
3992          * @since 1.22
3993          */
3994         public function isTOCEnabled() {
3995                 return $this->mEnableTOC;
3996         }
3997
3998         /**
3999          * Enables/disables section edit links, doesn't override __NOEDITSECTION__
4000          * @param bool $flag
4001          * @since 1.23
4002          */
4003         public function enableSectionEditLinks( $flag = true ) {
4004                 $this->mEnableSectionEditLinks = $flag;
4005         }
4006
4007         /**
4008          * @return bool
4009          * @since 1.23
4010          */
4011         public function sectionEditLinksEnabled() {
4012                 return $this->mEnableSectionEditLinks;
4013         }
4014
4015         /**
4016          * Helper function to setup the PHP implementation of OOUI to use in this request.
4017          *
4018          * @since 1.26
4019          * @param String $skinName The Skin name to determine the correct OOUI theme
4020          * @param String $dir Language direction
4021          */
4022         public static function setupOOUI( $skinName = '', $dir = 'ltr' ) {
4023                 $themes = ExtensionRegistry::getInstance()->getAttribute( 'SkinOOUIThemes' );
4024                 // Make keys (skin names) lowercase for case-insensitive matching.
4025                 $themes = array_change_key_case( $themes, CASE_LOWER );
4026                 $theme = isset( $themes[$skinName] ) ? $themes[$skinName] : 'MediaWiki';
4027                 // For example, 'OOUI\MediaWikiTheme'.
4028                 $themeClass = "OOUI\\{$theme}Theme";
4029                 OOUI\Theme::setSingleton( new $themeClass() );
4030                 OOUI\Element::setDefaultDir( $dir );
4031         }
4032
4033         /**
4034          * Add ResourceLoader module styles for OOUI and set up the PHP implementation of it for use with
4035          * MediaWiki and this OutputPage instance.
4036          *
4037          * @since 1.25
4038          */
4039         public function enableOOUI() {
4040                 self::setupOOUI(
4041                         strtolower( $this->getSkin()->getSkinName() ),
4042                         $this->getLanguage()->getDir()
4043                 );
4044                 $this->addModuleStyles( [
4045                         'oojs-ui-core.styles',
4046                         'oojs-ui.styles.icons',
4047                         'oojs-ui.styles.indicators',
4048                         'oojs-ui.styles.textures',
4049                         'mediawiki.widgets.styles',
4050                 ] );
4051                 // Used by 'skipFunction' of the four 'oojs-ui.styles.*' modules. Please don't treat this as a
4052                 // public API or you'll be severely disappointed when T87871 is fixed and it disappears.
4053                 $this->addMeta( 'X-OOUI-PHP', '1' );
4054         }
4055 }