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\Linker\LinkTarget;
  24 use MediaWiki\MediaWikiServices;
  25 use MediaWiki\Session\SessionManager;
  26 use Wikimedia\Rdbms\IResultWrapper;
  27 use Wikimedia\RelPath;
  28 use Wikimedia\WrappedString;
  29 use Wikimedia\WrappedStringList;
  30
  31 /**
  32  * This is one of the Core classes and should
  33  * be read at least once by any new developers. Also documented at
  34  * https://www.mediawiki.org/wiki/Manual:Architectural_modules/OutputPage
  35  *
  36  * This class is used to prepare the final rendering. A skin is then
  37  * applied to the output parameters (links, javascript, html, categories ...).
  38  *
  39  * @todo FIXME: Another class handles sending the whole page to the client.
  40  *
  41  * Some comments comes from a pairing session between Zak Greant and Antoine Musso
  42  * in November 2010.
  43  *
  44  * @todo document
  45  */
  46 class OutputPage extends ContextSource {
  47         /** @var string[][] Should be private. Used with addMeta() which adds "<meta>" */
  48         protected $mMetatags = [];
  49
  50         /** @var array */
  51         protected $mLinktags = [];
  52
  53         /** @var bool */
  54         protected $mCanonicalUrl = false;
  55
  56         /**
  57          * @var string The contents of <h1>
  58          */
  59         private $mPageTitle = '';
  60
  61         /**
  62          * @var string The displayed title of the page. Different from page title
  63          * if overridden by display title magic word or hooks. Can contain safe
  64          * HTML. Different from page title which may contain messages such as
  65          * "Editing X" which is displayed in h1. This can be used for other places
  66          * where the page name is referred on the page.
  67          */
  68         private $displayTitle;
  69
  70         /**
  71          * @var string Contains all of the "<body>" content. Should be private we
  72          *   got set/get accessors and the append() method.
  73          */
  74         public $mBodytext = '';
  75
  76         /** @var string Stores contents of "<title>" tag */
  77         private $mHTMLtitle = '';
  78
  79         /**
  80          * @var bool Is the displayed content related to the source of the
  81          *   corresponding wiki article.
  82          */
  83         private $mIsArticle = false;
  84
  85         /** @var bool Stores "article flag" toggle. */
  86         private $mIsArticleRelated = true;
  87
  88         /** @var bool Is the content subject to copyright */
  89         private $mHasCopyright = false;
  90
  91         /**
  92          * @var bool We have to set isPrintable(). Some pages should
  93          * never be printed (ex: redirections).
  94          */
  95         private $mPrintable = false;
  96
  97         /**
  98          * @var array Contains the page subtitle. Special pages usually have some
  99          *   links here. Don't confuse with site subtitle added by skins.
 100          */
 101         private $mSubtitle = [];
 102
 103         /** @var string */
 104         public $mRedirect = '';
 105
 106         /** @var int */
 107         protected $mStatusCode;
 108
 109         /**
 110          * @var string Used for sending cache control.
 111          *   The whole caching system should probably be moved into its own class.
 112          */
 113         protected $mLastModified = '';
 114
 115         /** @var array */
 116         protected $mCategoryLinks = [];
 117
 118         /** @var array */
 119         protected $mCategories = [
 120                 'hidden' => [],
 121                 'normal' => [],
 122         ];
 123
 124         /** @var array */
 125         protected $mIndicators = [];
 126
 127         /** @var array Array of Interwiki Prefixed (non DB key) Titles (e.g. 'fr:Test page') */
 128         private $mLanguageLinks = [];
 129
 130         /**
 131          * Used for JavaScript (predates ResourceLoader)
 132          * @todo We should split JS / CSS.
 133          * mScripts content is inserted as is in "<head>" by Skin. This might
 134          * contain either a link to a stylesheet or inline CSS.
 135          */
 136         private $mScripts = '';
 137
 138         /** @var string Inline CSS styles. Use addInlineStyle() sparingly */
 139         protected $mInlineStyles = '';
 140
 141         /**
 142          * @var string Used by skin template.
 143          * Example: $tpl->set( 'displaytitle', $out->mPageLinkTitle );
 144          */
 145         public $mPageLinkTitle = '';
 146
 147         /** @var array Array of elements in "<head>". Parser might add its own headers! */
 148         protected $mHeadItems = [];
 149
 150         /** @var array Additional <body> classes; there are also <body> classes from other sources */
 151         protected $mAdditionalBodyClasses = [];
 152
 153         /** @var array */
 154         protected $mModules = [];
 155
 156         /** @var array */
 157         protected $mModuleStyles = [];
 158
 159         /** @var ResourceLoader */
 160         protected $mResourceLoader;
 161
 162         /** @var ResourceLoaderClientHtml */
 163         private $rlClient;
 164
 165         /** @var ResourceLoaderContext */
 166         private $rlClientContext;
 167
 168         /** @var array */
 169         private $rlExemptStyleModules;
 170
 171         /** @var array */
 172         protected $mJsConfigVars = [];
 173
 174         /** @var array */
 175         protected $mTemplateIds = [];
 176
 177         /** @var array */
 178         protected $mImageTimeKeys = [];
 179
 180         /** @var string */
 181         public $mRedirectCode = '';
 182
 183         protected $mFeedLinksAppendQuery = null;
 184
 185         /** @var array
 186          * What level of 'untrustworthiness' is allowed in CSS/JS modules loaded on this page?
 187          * @see ResourceLoaderModule::$origin
 188          * ResourceLoaderModule::ORIGIN_ALL is assumed unless overridden;
 189          */
 190         protected $mAllowedModules = [
 191                 ResourceLoaderModule::TYPE_COMBINED => ResourceLoaderModule::ORIGIN_ALL,
 192         ];
 193
 194         /** @var bool Whether output is disabled.  If this is true, the 'output' method will do nothing. */
 195         protected $mDoNothing = false;
 196
 197         // Parser related.
 198
 199         /** @var int */
 200         protected $mContainsNewMagic = 0;
 201
 202         /**
 203          * lazy initialised, use parserOptions()
 204          * @var ParserOptions
 205          */
 206         protected $mParserOptions = null;
 207
 208         /**
 209          * Handles the Atom / RSS links.
 210          * We probably only support Atom in 2011.
 211          * @see $wgAdvertisedFeedTypes
 212          */
 213         private $mFeedLinks = [];
 214
 215         // Gwicke work on squid caching? Roughly from 2003.
 216         protected $mEnableClientCache = true;
 217
 218         /** @var bool Flag if output should only contain the body of the article. */
 219         private $mArticleBodyOnly = false;
 220
 221         /** @var bool */
 222         protected $mNewSectionLink = false;
 223
 224         /** @var bool */
 225         protected $mHideNewSectionLink = false;
 226
 227         /**
 228          * @var bool Comes from the parser. This was probably made to load CSS/JS
 229          * only if we had "<gallery>". Used directly in CategoryPage.php.
 230          * Looks like ResourceLoader can replace this.
 231          */
 232         public $mNoGallery = false;
 233
 234         /** @var int Cache stuff. Looks like mEnableClientCache */
 235         protected $mCdnMaxage = 0;
 236         /** @var int Upper limit on mCdnMaxage */
 237         protected $mCdnMaxageLimit = INF;
 238
 239         /**
 240          * @var bool Controls if anti-clickjacking / frame-breaking headers will
 241          * be sent. This should be done for pages where edit actions are possible.
 242          * Setters: $this->preventClickjacking() and $this->allowClickjacking().
 243          */
 244         protected $mPreventClickjacking = true;
 245
 246         /** @var int To include the variable {{REVISIONID}} */
 247         private $mRevisionId = null;
 248
 249         /** @var string */
 250         private $mRevisionTimestamp = null;
 251
 252         /** @var array */
 253         protected $mFileVersion = null;
 254
 255         /**
 256          * @var array An array of stylesheet filenames (relative from skins path),
 257          * with options for CSS media, IE conditions, and RTL/LTR direction.
 258          * For internal use; add settings in the skin via $this->addStyle()
 259          *
 260          * Style again! This seems like a code duplication since we already have
 261          * mStyles. This is what makes Open Source amazing.
 262          */
 263         protected $styles = [];
 264
 265         private $mIndexPolicy = 'index';
 266         private $mFollowPolicy = 'follow';
 267
 268         /**
 269          * @var array Headers that cause the cache to vary.  Key is header name,
 270          * value should always be null.  (Value was an array of options for
 271          * the `Key` header, which was deprecated in 1.32 and removed in 1.34.)
 272          */
 273         private $mVaryHeader = [
 274                 'Accept-Encoding' => null,
 275         ];
 276
 277         /**
 278          * If the current page was reached through a redirect, $mRedirectedFrom contains the Title
 279          * of the redirect.
 280          *
 281          * @var Title
 282          */
 283         private $mRedirectedFrom = null;
 284
 285         /**
 286          * Additional key => value data
 287          */
 288         private $mProperties = [];
 289
 290         /**
 291          * @var string|null ResourceLoader target for load.php links. If null, will be omitted
 292          */
 293         private $mTarget = null;
 294
 295         /**
 296          * @var bool Whether parser output contains a table of contents
 297          */
 298         private $mEnableTOC = false;
 299
 300         /**
 301          * @var string|null The URL to send in a <link> element with rel=license
 302          */
 303         private $copyrightUrl;
 304
 305         /** @var array Profiling data */
 306         private $limitReportJSData = [];
 307
 308         /** @var array Map Title to Content */
 309         private $contentOverrides = [];
 310
 311         /** @var callable[] */
 312         private $contentOverrideCallbacks = [];
 313
 314         /**
 315          * Link: header contents
 316          */
 317         private $mLinkHeader = [];
 318
 319         /**
 320          * @var string The nonce for Content-Security-Policy
 321          */
 322         private $CSPNonce;
 323
 324         /**
 325          * @var array A cache of the names of the cookies that will influence the cache
 326          */
 327         private static $cacheVaryCookies = null;
 328
 329         /**
 330          * Constructor for OutputPage. This should not be called directly.
 331          * Instead a new RequestContext should be created and it will implicitly create
 332          * a OutputPage tied to that context.
 333          * @param IContextSource $context
 334          */
 335         function __construct( IContextSource $context ) {
 336                 $this->setContext( $context );
 337         }
 338
 339         /**
 340          * Redirect to $url rather than displaying the normal page
 341          *
 342          * @param string $url
 343          * @param string $responsecode HTTP status code
 344          */
 345         public function redirect( $url, $responsecode = '302' ) {
 346                 # Strip newlines as a paranoia check for header injection in PHP<5.1.2
 347                 $this->mRedirect = str_replace( "\n", '', $url );
 348                 $this->mRedirectCode = $responsecode;
 349         }
 350
 351         /**
 352          * Get the URL to redirect to, or an empty string if not redirect URL set
 353          *
 354          * @return string
 355          */
 356         public function getRedirect() {
 357                 return $this->mRedirect;
 358         }
 359
 360         /**
 361          * Set the copyright URL to send with the output.
 362          * Empty string to omit, null to reset.
 363          *
 364          * @since 1.26
 365          *
 366          * @param string|null $url
 367          */
 368         public function setCopyrightUrl( $url ) {
 369                 $this->copyrightUrl = $url;
 370         }
 371
 372         /**
 373          * Set the HTTP status code to send with the output.
 374          *
 375          * @param int $statusCode
 376          */
 377         public function setStatusCode( $statusCode ) {
 378                 $this->mStatusCode = $statusCode;
 379         }
 380
 381         /**
 382          * Add a new "<meta>" tag
 383          * To add an http-equiv meta tag, precede the name with "http:"
 384          *
 385          * @param string $name Name of the meta tag
 386          * @param string $val Value of the meta tag
 387          */
 388         function addMeta( $name, $val ) {
 389                 array_push( $this->mMetatags, [ $name, $val ] );
 390         }
 391
 392         /**
 393          * Returns the current <meta> tags
 394          *
 395          * @since 1.25
 396          * @return array
 397          */
 398         public function getMetaTags() {
 399                 return $this->mMetatags;
 400         }
 401
 402         /**
 403          * Add a new \<link\> tag to the page header.
 404          *
 405          * Note: use setCanonicalUrl() for rel=canonical.
 406          *
 407          * @param array $linkarr Associative array of attributes.
 408          */
 409         function addLink( array $linkarr ) {
 410                 array_push( $this->mLinktags, $linkarr );
 411         }
 412
 413         /**
 414          * Returns the current <link> tags
 415          *
 416          * @since 1.25
 417          * @return array
 418          */
 419         public function getLinkTags() {
 420                 return $this->mLinktags;
 421         }
 422
 423         /**
 424          * Set the URL to be used for the <link rel=canonical>. This should be used
 425          * in preference to addLink(), to avoid duplicate link tags.
 426          * @param string $url
 427          */
 428         function setCanonicalUrl( $url ) {
 429                 $this->mCanonicalUrl = $url;
 430         }
 431
 432         /**
 433          * Returns the URL to be used for the <link rel=canonical> if
 434          * one is set.
 435          *
 436          * @since 1.25
 437          * @return bool|string
 438          */
 439         public function getCanonicalUrl() {
 440                 return $this->mCanonicalUrl;
 441         }
 442
 443         /**
 444          * Add raw HTML to the list of scripts (including \<script\> tag, etc.)
 445          * Internal use only. Use OutputPage::addModules() or OutputPage::addJsConfigVars()
 446          * if possible.
 447          *
 448          * @param string $script Raw HTML
 449          */
 450         function addScript( $script ) {
 451                 $this->mScripts .= $script;
 452         }
 453
 454         /**
 455          * Add a JavaScript file to be loaded as `<script>` on this page.
 456          *
 457          * Internal use only. Use OutputPage::addModules() if possible.
 458          *
 459          * @param string $file URL to file (absolute path, protocol-relative, or full url)
 460          * @param string|null $unused Previously used to change the cache-busting query parameter
 461          */
 462         public function addScriptFile( $file, $unused = null ) {
 463                 $this->addScript( Html::linkedScript( $file, $this->getCSPNonce() ) );
 464         }
 465
 466         /**
 467          * Add a self-contained script tag with the given contents
 468          * Internal use only. Use OutputPage::addModules() if possible.
 469          *
 470          * @param string $script JavaScript text, no script tags
 471          */
 472         public function addInlineScript( $script ) {
 473                 $this->mScripts .= Html::inlineScript( "\n$script\n", $this->getCSPNonce() ) . "\n";
 474         }
 475
 476         /**
 477          * Filter an array of modules to remove insufficiently trustworthy members, and modules
 478          * which are no longer registered (eg a page is cached before an extension is disabled)
 479          * @param array $modules
 480          * @param string|null $position Unused
 481          * @param string $type
 482          * @return array
 483          */
 484         protected function filterModules( array $modules, $position = null,
 485                 $type = ResourceLoaderModule::TYPE_COMBINED
 486         ) {
 487                 $resourceLoader = $this->getResourceLoader();
 488                 $filteredModules = [];
 489                 foreach ( $modules as $val ) {
 490                         $module = $resourceLoader->getModule( $val );
 491                         if ( $module instanceof ResourceLoaderModule
 492                                 && $module->getOrigin() <= $this->getAllowedModules( $type )
 493                         ) {
 494                                 if ( $this->mTarget && !in_array( $this->mTarget, $module->getTargets() ) ) {
 495                                         $this->warnModuleTargetFilter( $module->getName() );
 496                                         continue;
 497                                 }
 498                                 $filteredModules[] = $val;
 499                         }
 500                 }
 501                 return $filteredModules;
 502         }
 503
 504         private function warnModuleTargetFilter( $moduleName ) {
 505                 static $warnings = [];
 506                 if ( isset( $warnings[$this->mTarget][$moduleName] ) ) {
 507                         return;
 508                 }
 509                 $warnings[$this->mTarget][$moduleName] = true;
 510                 $this->getResourceLoader()->getLogger()->debug(
 511                         'Module "{module}" not loadable on target "{target}".',
 512                         [
 513                                 'module' => $moduleName,
 514                                 'target' => $this->mTarget,
 515                         ]
 516                 );
 517         }
 518
 519         /**
 520          * Get the list of modules to include on this page
 521          *
 522          * @param bool $filter Whether to filter out insufficiently trustworthy modules
 523          * @param string|null $position Unused
 524          * @param string $param
 525          * @param string $type
 526          * @return array Array of module names
 527          */
 528         public function getModules( $filter = false, $position = null, $param = 'mModules',
 529                 $type = ResourceLoaderModule::TYPE_COMBINED
 530         ) {
 531                 $modules = array_values( array_unique( $this->$param ) );
 532                 return $filter
 533                         ? $this->filterModules( $modules, null, $type )
 534                         : $modules;
 535         }
 536
 537         /**
 538          * Load one or more ResourceLoader modules on this page.
 539          *
 540          * @param string|array $modules Module name (string) or array of module names
 541          */
 542         public function addModules( $modules ) {
 543                 $this->mModules = array_merge( $this->mModules, (array)$modules );
 544         }
 545
 546         /**
 547          * Get the list of style-only modules to load on this page.
 548          *
 549          * @param bool $filter
 550          * @param string|null $position Unused
 551          * @return array Array of module names
 552          */
 553         public function getModuleStyles( $filter = false, $position = null ) {
 554                 return $this->getModules( $filter, null, 'mModuleStyles',
 555                         ResourceLoaderModule::TYPE_STYLES
 556                 );
 557         }
 558
 559         /**
 560          * Load the styles of one or more ResourceLoader modules on this page.
 561          *
 562          * Module styles added through this function will be loaded as a stylesheet,
 563          * using a standard `<link rel=stylesheet>` HTML tag, rather than as a combined
 564          * Javascript and CSS package. Thus, they will even load when JavaScript is disabled.
 565          *
 566          * @param string|array $modules Module name (string) or array of module names
 567          */
 568         public function addModuleStyles( $modules ) {
 569                 $this->mModuleStyles = array_merge( $this->mModuleStyles, (array)$modules );
 570         }
 571
 572         /**
 573          * @return null|string ResourceLoader target
 574          */
 575         public function getTarget() {
 576                 return $this->mTarget;
 577         }
 578
 579         /**
 580          * Sets ResourceLoader target for load.php links. If null, will be omitted
 581          *
 582          * @param string|null $target
 583          */
 584         public function setTarget( $target ) {
 585                 $this->mTarget = $target;
 586         }
 587
 588         /**
 589          * Add a mapping from a LinkTarget to a Content, for things like page preview.
 590          * @see self::addContentOverrideCallback()
 591          * @since 1.32
 592          * @param LinkTarget $target
 593          * @param Content $content
 594          */
 595         public function addContentOverride( LinkTarget $target, Content $content ) {
 596                 if ( !$this->contentOverrides ) {
 597                         // Register a callback for $this->contentOverrides on the first call
 598                         $this->addContentOverrideCallback( function ( LinkTarget $target ) {
 599                                 $key = $target->getNamespace() . ':' . $target->getDBkey();
 600                                 return $this->contentOverrides[$key] ?? null;
 601                         } );
 602                 }
 603
 604                 $key = $target->getNamespace() . ':' . $target->getDBkey();
 605                 $this->contentOverrides[$key] = $content;
 606         }
 607
 608         /**
 609          * Add a callback for mapping from a Title to a Content object, for things
 610          * like page preview.
 611          * @see ResourceLoaderContext::getContentOverrideCallback()
 612          * @since 1.32
 613          * @param callable $callback
 614          */
 615         public function addContentOverrideCallback( callable $callback ) {
 616                 $this->contentOverrideCallbacks[] = $callback;
 617         }
 618
 619         /**
 620          * Get an array of head items
 621          *
 622          * @return array
 623          */
 624         function getHeadItemsArray() {
 625                 return $this->mHeadItems;
 626         }
 627
 628         /**
 629          * Add or replace a head item to the output
 630          *
 631          * Whenever possible, use more specific options like ResourceLoader modules,
 632          * OutputPage::addLink(), OutputPage::addMetaLink() and OutputPage::addFeedLink()
 633          * Fallback options for those are: OutputPage::addStyle, OutputPage::addScript(),
 634          * OutputPage::addInlineScript() and OutputPage::addInlineStyle()
 635          * This would be your very LAST fallback.
 636          *
 637          * @param string $name Item name
 638          * @param string $value Raw HTML
 639          */
 640         public function addHeadItem( $name, $value ) {
 641                 $this->mHeadItems[$name] = $value;
 642         }
 643
 644         /**
 645          * Add one or more head items to the output
 646          *
 647          * @since 1.28
 648          * @param string|string[] $values Raw HTML
 649          */
 650         public function addHeadItems( $values ) {
 651                 $this->mHeadItems = array_merge( $this->mHeadItems, (array)$values );
 652         }
 653
 654         /**
 655          * Check if the header item $name is already set
 656          *
 657          * @param string $name Item name
 658          * @return bool
 659          */
 660         public function hasHeadItem( $name ) {
 661                 return isset( $this->mHeadItems[$name] );
 662         }
 663
 664         /**
 665          * Add a class to the <body> element
 666          *
 667          * @since 1.30
 668          * @param string|string[] $classes One or more classes to add
 669          */
 670         public function addBodyClasses( $classes ) {
 671                 $this->mAdditionalBodyClasses = array_merge( $this->mAdditionalBodyClasses, (array)$classes );
 672         }
 673
 674         /**
 675          * Set whether the output should only contain the body of the article,
 676          * without any skin, sidebar, etc.
 677          * Used e.g. when calling with "action=render".
 678          *
 679          * @param bool $only Whether to output only the body of the article
 680          */
 681         public function setArticleBodyOnly( $only ) {
 682                 $this->mArticleBodyOnly = $only;
 683         }
 684
 685         /**
 686          * Return whether the output will contain only the body of the article
 687          *
 688          * @return bool
 689          */
 690         public function getArticleBodyOnly() {
 691                 return $this->mArticleBodyOnly;
 692         }
 693
 694         /**
 695          * Set an additional output property
 696          * @since 1.21
 697          *
 698          * @param string $name
 699          * @param mixed $value
 700          */
 701         public function setProperty( $name, $value ) {
 702                 $this->mProperties[$name] = $value;
 703         }
 704
 705         /**
 706          * Get an additional output property
 707          * @since 1.21
 708          *
 709          * @param string $name
 710          * @return mixed Property value or null if not found
 711          */
 712         public function getProperty( $name ) {
 713                 return $this->mProperties[$name] ?? null;
 714         }
 715
 716         /**
 717          * checkLastModified tells the client to use the client-cached page if
 718          * possible. If successful, the OutputPage is disabled so that
 719          * any future call to OutputPage->output() have no effect.
 720          *
 721          * Side effect: sets mLastModified for Last-Modified header
 722          *
 723          * @param string $timestamp
 724          *
 725          * @return bool True if cache-ok headers was sent.
 726          */
 727         public function checkLastModified( $timestamp ) {
 728                 if ( !$timestamp || $timestamp == '19700101000000' ) {
 729                         wfDebug( __METHOD__ . ": CACHE DISABLED, NO TIMESTAMP\n" );
 730                         return false;
 731                 }
 732                 $config = $this->getConfig();
 733                 if ( !$config->get( 'CachePages' ) ) {
 734                         wfDebug( __METHOD__ . ": CACHE DISABLED\n" );
 735                         return false;
 736                 }
 737
 738                 $timestamp = wfTimestamp( TS_MW, $timestamp );
 739                 $modifiedTimes = [
 740                         'page' => $timestamp,
 741                         'user' => $this->getUser()->getTouched(),
 742                         'epoch' => $config->get( 'CacheEpoch' )
 743                 ];
 744                 if ( $config->get( 'UseCdn' ) ) {
 745                         $modifiedTimes['sepoch'] = wfTimestamp( TS_MW, $this->getCdnCacheEpoch(
 746                                 time(),
 747                                 $config->get( 'CdnMaxAge' )
 748                         ) );
 749                 }
 750                 Hooks::run( 'OutputPageCheckLastModified', [ &$modifiedTimes, $this ] );
 751
 752                 $maxModified = max( $modifiedTimes );
 753                 $this->mLastModified = wfTimestamp( TS_RFC2822, $maxModified );
 754
 755                 $clientHeader = $this->getRequest()->getHeader( 'If-Modified-Since' );
 756                 if ( $clientHeader === false ) {
 757                         wfDebug( __METHOD__ . ": client did not send If-Modified-Since header", 'private' );
 758                         return false;
 759                 }
 760
 761                 # IE sends sizes after the date like this:
 762                 # Wed, 20 Aug 2003 06:51:19 GMT; length=5202
 763                 # this breaks strtotime().
 764                 $clientHeader = preg_replace( '/;.*$/', '', $clientHeader );
 765
 766                 Wikimedia\suppressWarnings(); // E_STRICT system time warnings
 767                 $clientHeaderTime = strtotime( $clientHeader );
 768                 Wikimedia\restoreWarnings();
 769                 if ( !$clientHeaderTime ) {
 770                         wfDebug( __METHOD__
 771                                 . ": unable to parse the client's If-Modified-Since header: $clientHeader\n" );
 772                         return false;
 773                 }
 774                 $clientHeaderTime = wfTimestamp( TS_MW, $clientHeaderTime );
 775
 776                 # Make debug info
 777                 $info = '';
 778                 foreach ( $modifiedTimes as $name => $value ) {
 779                         if ( $info !== '' ) {
 780                                 $info .= ', ';
 781                         }
 782                         $info .= "$name=" . wfTimestamp( TS_ISO_8601, $value );
 783                 }
 784
 785                 wfDebug( __METHOD__ . ": client sent If-Modified-Since: " .
 786                         wfTimestamp( TS_ISO_8601, $clientHeaderTime ), 'private' );
 787                 wfDebug( __METHOD__ . ": effective Last-Modified: " .
 788                         wfTimestamp( TS_ISO_8601, $maxModified ), 'private' );
 789                 if ( $clientHeaderTime < $maxModified ) {
 790                         wfDebug( __METHOD__ . ": STALE, $info", 'private' );
 791                         return false;
 792                 }
 793
 794                 # Not modified
 795                 # Give a 304 Not Modified response code and disable body output
 796                 wfDebug( __METHOD__ . ": NOT MODIFIED, $info", 'private' );
 797                 ini_set( 'zlib.output_compression', 0 );
 798                 $this->getRequest()->response()->statusHeader( 304 );
 799                 $this->sendCacheControl();
 800                 $this->disable();
 801
 802                 // Don't output a compressed blob when using ob_gzhandler;
 803                 // it's technically against HTTP spec and seems to confuse
 804                 // Firefox when the response gets split over two packets.
 805                 wfClearOutputBuffers();
 806
 807                 return true;
 808         }
 809
 810         /**
 811          * @param int $reqTime Time of request (eg. now)
 812          * @param int $maxAge Cache TTL in seconds
 813          * @return int Timestamp
 814          */
 815         private function getCdnCacheEpoch( $reqTime, $maxAge ) {
 816                 // Ensure Last-Modified is never more than $wgCdnMaxAge in the past,
 817                 // because even if the wiki page content hasn't changed since, static
 818                 // resources may have changed (skin HTML, interface messages, urls, etc.)
 819                 // and must roll-over in a timely manner (T46570)
 820                 return $reqTime - $maxAge;
 821         }
 822
 823         /**
 824          * Override the last modified timestamp
 825          *
 826          * @param string $timestamp New timestamp, in a format readable by
 827          *        wfTimestamp()
 828          */
 829         public function setLastModified( $timestamp ) {
 830                 $this->mLastModified = wfTimestamp( TS_RFC2822, $timestamp );
 831         }
 832
 833         /**
 834          * Set the robot policy for the page: <http://www.robotstxt.org/meta.html>
 835          *
 836          * @param string $policy The literal string to output as the contents of
 837          *   the meta tag.  Will be parsed according to the spec and output in
 838          *   standardized form.
 839          * @return null
 840          */
 841         public function setRobotPolicy( $policy ) {
 842                 $policy = Article::formatRobotPolicy( $policy );
 843
 844                 if ( isset( $policy['index'] ) ) {
 845                         $this->setIndexPolicy( $policy['index'] );
 846                 }
 847                 if ( isset( $policy['follow'] ) ) {
 848                         $this->setFollowPolicy( $policy['follow'] );
 849                 }
 850         }
 851
 852         /**
 853          * Set the index policy for the page, but leave the follow policy un-
 854          * touched.
 855          *
 856          * @param string $policy Either 'index' or 'noindex'.
 857          * @return null
 858          */
 859         public function setIndexPolicy( $policy ) {
 860                 $policy = trim( $policy );
 861                 if ( in_array( $policy, [ 'index', 'noindex' ] ) ) {
 862                         $this->mIndexPolicy = $policy;
 863                 }
 864         }
 865
 866         /**
 867          * Set the follow policy for the page, but leave the index policy un-
 868          * touched.
 869          *
 870          * @param string $policy Either 'follow' or 'nofollow'.
 871          * @return null
 872          */
 873         public function setFollowPolicy( $policy ) {
 874                 $policy = trim( $policy );
 875                 if ( in_array( $policy, [ 'follow', 'nofollow' ] ) ) {
 876                         $this->mFollowPolicy = $policy;
 877                 }
 878         }
 879
 880         /**
 881          * "HTML title" means the contents of "<title>".
 882          * It is stored as plain, unescaped text and will be run through htmlspecialchars in the skin file.
 883          *
 884          * @param string|Message $name
 885          */
 886         public function setHTMLTitle( $name ) {
 887                 if ( $name instanceof Message ) {
 888                         $this->mHTMLtitle = $name->setContext( $this->getContext() )->text();
 889                 } else {
 890                         $this->mHTMLtitle = $name;
 891                 }
 892         }
 893
 894         /**
 895          * Return the "HTML title", i.e. the content of the "<title>" tag.
 896          *
 897          * @return string
 898          */
 899         public function getHTMLTitle() {
 900                 return $this->mHTMLtitle;
 901         }
 902
 903         /**
 904          * Set $mRedirectedFrom, the Title of the page which redirected us to the current page.
 905          *
 906          * @param Title $t
 907          */
 908         public function setRedirectedFrom( $t ) {
 909                 $this->mRedirectedFrom = $t;
 910         }
 911
 912         /**
 913          * "Page title" means the contents of \<h1\>. It is stored as a valid HTML
 914          * fragment. This function allows good tags like \<sup\> in the \<h1\> tag,
 915          * but not bad tags like \<script\>. This function automatically sets
 916          * \<title\> to the same content as \<h1\> but with all tags removed. Bad
 917          * tags that were escaped in \<h1\> will still be escaped in \<title\>, and
 918          * good tags like \<i\> will be dropped entirely.
 919          *
 920          * @param string|Message $name
 921          * @param-taint $name tainted
 922          * Phan-taint-check gets very confused by $name being either a string or a Message
 923          */
 924         public function setPageTitle( $name ) {
 925                 if ( $name instanceof Message ) {
 926                         $name = $name->setContext( $this->getContext() )->text();
 927                 }
 928
 929                 # change "<script>foo&bar</script>" to "&lt;script&gt;foo&amp;bar&lt;/script&gt;"
 930                 # but leave "<i>foobar</i>" alone
 931                 $nameWithTags = Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags( $name ) );
 932                 $this->mPageTitle = $nameWithTags;
 933
 934                 # change "<i>foo&amp;bar</i>" to "foo&bar"
 935                 $this->setHTMLTitle(
 936                         $this->msg( 'pagetitle' )->plaintextParams( Sanitizer::stripAllTags( $nameWithTags ) )
 937                                 ->inContentLanguage()
 938                 );
 939         }
 940
 941         /**
 942          * Return the "page title", i.e. the content of the \<h1\> tag.
 943          *
 944          * @return string
 945          */
 946         public function getPageTitle() {
 947                 return $this->mPageTitle;
 948         }
 949
 950         /**
 951          * Same as page title but only contains name of the page, not any other text.
 952          *
 953          * @since 1.32
 954          * @param string $html Page title text.
 955          * @see OutputPage::setPageTitle
 956          */
 957         public function setDisplayTitle( $html ) {
 958                 $this->displayTitle = $html;
 959         }
 960
 961         /**
 962          * Returns page display title.
 963          *
 964          * Performs some normalization, but this not as strict the magic word.
 965          *
 966          * @since 1.32
 967          * @return string HTML
 968          */
 969         public function getDisplayTitle() {
 970                 $html = $this->displayTitle;
 971                 if ( $html === null ) {
 972                         $html = $this->getTitle()->getPrefixedText();
 973                 }
 974
 975                 return Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags( $html ) );
 976         }
 977
 978         /**
 979          * Returns page display title without namespace prefix if possible.
 980          *
 981          * @since 1.32
 982          * @return string HTML
 983          */
 984         public function getUnprefixedDisplayTitle() {
 985                 $text = $this->getDisplayTitle();
 986                 $nsPrefix = $this->getTitle()->getNsText() . ':';
 987                 $prefix = preg_quote( $nsPrefix, '/' );
 988
 989                 return preg_replace( "/^$prefix/i", '', $text );
 990         }
 991
 992         /**
 993          * Set the Title object to use
 994          *
 995          * @param Title $t
 996          */
 997         public function setTitle( Title $t ) {
 998                 // @phan-suppress-next-next-line PhanUndeclaredMethod
 999                 // @fixme Not all implementations of IContextSource have this method!
1000                 $this->getContext()->setTitle( $t );
1001         }
1002
1003         /**
1004          * Replace the subtitle with $str
1005          *
1006          * @param string|Message $str New value of the subtitle. String should be safe HTML.
1007          */
1008         public function setSubtitle( $str ) {
1009                 $this->clearSubtitle();
1010                 $this->addSubtitle( $str );
1011         }
1012
1013         /**
1014          * Add $str to the subtitle
1015          *
1016          * @param string|Message $str String or Message to add to the subtitle. String should be safe HTML.
1017          */
1018         public function addSubtitle( $str ) {
1019                 if ( $str instanceof Message ) {
1020                         $this->mSubtitle[] = $str->setContext( $this->getContext() )->parse();
1021                 } else {
1022                         $this->mSubtitle[] = $str;
1023                 }
1024         }
1025
1026         /**
1027          * Build message object for a subtitle containing a backlink to a page
1028          *
1029          * @param Title $title Title to link to
1030          * @param array $query Array of additional parameters to include in the link
1031          * @return Message
1032          * @since 1.25
1033          */
1034         public static function buildBacklinkSubtitle( Title $title, $query = [] ) {
1035                 if ( $title->isRedirect() ) {
1036                         $query['redirect'] = 'no';
1037                 }
1038                 $linkRenderer = MediaWikiServices::getInstance()->getLinkRenderer();
1039                 return wfMessage( 'backlinksubtitle' )
1040                         ->rawParams( $linkRenderer->makeLink( $title, null, [], $query ) );
1041         }
1042
1043         /**
1044          * Add a subtitle containing a backlink to a page
1045          *
1046          * @param Title $title Title to link to
1047          * @param array $query Array of additional parameters to include in the link
1048          */
1049         public function addBacklinkSubtitle( Title $title, $query = [] ) {
1050                 $this->addSubtitle( self::buildBacklinkSubtitle( $title, $query ) );
1051         }
1052
1053         /**
1054          * Clear the subtitles
1055          */
1056         public function clearSubtitle() {
1057                 $this->mSubtitle = [];
1058         }
1059
1060         /**
1061          * Get the subtitle
1062          *
1063          * @return string
1064          */
1065         public function getSubtitle() {
1066                 return implode( "<br />\n\t\t\t\t", $this->mSubtitle );
1067         }
1068
1069         /**
1070          * Set the page as printable, i.e. it'll be displayed with all
1071          * print styles included
1072          */
1073         public function setPrintable() {
1074                 $this->mPrintable = true;
1075         }
1076
1077         /**
1078          * Return whether the page is "printable"
1079          *
1080          * @return bool
1081          */
1082         public function isPrintable() {
1083                 return $this->mPrintable;
1084         }
1085
1086         /**
1087          * Disable output completely, i.e. calling output() will have no effect
1088          */
1089         public function disable() {
1090                 $this->mDoNothing = true;
1091         }
1092
1093         /**
1094          * Return whether the output will be completely disabled
1095          *
1096          * @return bool
1097          */
1098         public function isDisabled() {
1099                 return $this->mDoNothing;
1100         }
1101
1102         /**
1103          * Show an "add new section" link?
1104          *
1105          * @return bool
1106          */
1107         public function showNewSectionLink() {
1108                 return $this->mNewSectionLink;
1109         }
1110
1111         /**
1112          * Forcibly hide the new section link?
1113          *
1114          * @return bool
1115          */
1116         public function forceHideNewSectionLink() {
1117                 return $this->mHideNewSectionLink;
1118         }
1119
1120         /**
1121          * Add or remove feed links in the page header
1122          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
1123          * for the new version
1124          * @see addFeedLink()
1125          *
1126          * @param bool $show True: add default feeds, false: remove all feeds
1127          */
1128         public function setSyndicated( $show = true ) {
1129                 if ( $show ) {
1130                         $this->setFeedAppendQuery( false );
1131                 } else {
1132                         $this->mFeedLinks = [];
1133                 }
1134         }
1135
1136         /**
1137          * Return effective list of advertised feed types
1138          * @see addFeedLink()
1139          *
1140          * @return array Array of feed type names ( 'rss', 'atom' )
1141          */
1142         protected function getAdvertisedFeedTypes() {
1143                 if ( $this->getConfig()->get( 'Feed' ) ) {
1144                         return $this->getConfig()->get( 'AdvertisedFeedTypes' );
1145                 } else {
1146                         return [];
1147                 }
1148         }
1149
1150         /**
1151          * Add default feeds to the page header
1152          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
1153          * for the new version
1154          * @see addFeedLink()
1155          *
1156          * @param string $val Query to append to feed links or false to output
1157          *        default links
1158          */
1159         public function setFeedAppendQuery( $val ) {
1160                 $this->mFeedLinks = [];
1161
1162                 foreach ( $this->getAdvertisedFeedTypes() as $type ) {
1163                         $query = "feed=$type";
1164                         if ( is_string( $val ) ) {
1165                                 $query .= '&' . $val;
1166                         }
1167                         $this->mFeedLinks[$type] = $this->getTitle()->getLocalURL( $query );
1168                 }
1169         }
1170
1171         /**
1172          * Add a feed link to the page header
1173          *
1174          * @param string $format Feed type, should be a key of $wgFeedClasses
1175          * @param string $href URL
1176          */
1177         public function addFeedLink( $format, $href ) {
1178                 if ( in_array( $format, $this->getAdvertisedFeedTypes() ) ) {
1179                         $this->mFeedLinks[$format] = $href;
1180                 }
1181         }
1182
1183         /**
1184          * Should we output feed links for this page?
1185          * @return bool
1186          */
1187         public function isSyndicated() {
1188                 return count( $this->mFeedLinks ) > 0;
1189         }
1190
1191         /**
1192          * Return URLs for each supported syndication format for this page.
1193          * @return array Associating format keys with URLs
1194          */
1195         public function getSyndicationLinks() {
1196                 return $this->mFeedLinks;
1197         }
1198
1199         /**
1200          * Will currently always return null
1201          *
1202          * @return null
1203          */
1204         public function getFeedAppendQuery() {
1205                 return $this->mFeedLinksAppendQuery;
1206         }
1207
1208         /**
1209          * Set whether the displayed content is related to the source of the
1210          * corresponding article on the wiki
1211          * Setting true will cause the change "article related" toggle to true
1212          *
1213          * @param bool $newVal
1214          */
1215         public function setArticleFlag( $newVal ) {
1216                 $this->mIsArticle = $newVal;
1217                 if ( $newVal ) {
1218                         $this->mIsArticleRelated = $newVal;
1219                 }
1220         }
1221
1222         /**
1223          * Return whether the content displayed page is related to the source of
1224          * the corresponding article on the wiki
1225          *
1226          * @return bool
1227          */
1228         public function isArticle() {
1229                 return $this->mIsArticle;
1230         }
1231
1232         /**
1233          * Set whether this page is related an article on the wiki
1234          * Setting false will cause the change of "article flag" toggle to false
1235          *
1236          * @param bool $newVal
1237          */
1238         public function setArticleRelated( $newVal ) {
1239                 $this->mIsArticleRelated = $newVal;
1240                 if ( !$newVal ) {
1241                         $this->mIsArticle = false;
1242                 }
1243         }
1244
1245         /**
1246          * Return whether this page is related an article on the wiki
1247          *
1248          * @return bool
1249          */
1250         public function isArticleRelated() {
1251                 return $this->mIsArticleRelated;
1252         }
1253
1254         /**
1255          * Set whether the standard copyright should be shown for the current page.
1256          *
1257          * @param bool $hasCopyright
1258          */
1259         public function setCopyright( $hasCopyright ) {
1260                 $this->mHasCopyright = $hasCopyright;
1261         }
1262
1263         /**
1264          * Return whether the standard copyright should be shown for the current page.
1265          * By default, it is true for all articles but other pages
1266          * can signal it by using setCopyright( true ).
1267          *
1268          * Used by SkinTemplate to decided whether to show the copyright.
1269          *
1270          * @return bool
1271          */
1272         public function showsCopyright() {
1273                 return $this->isArticle() || $this->mHasCopyright;
1274         }
1275
1276         /**
1277          * Add new language links
1278          *
1279          * @param string[] $newLinkArray Array of interwiki-prefixed (non DB key) titles
1280          *                               (e.g. 'fr:Test page')
1281          */
1282         public function addLanguageLinks( array $newLinkArray ) {
1283                 $this->mLanguageLinks = array_merge( $this->mLanguageLinks, $newLinkArray );
1284         }
1285
1286         /**
1287          * Reset the language links and add new language links
1288          *
1289          * @param string[] $newLinkArray Array of interwiki-prefixed (non DB key) titles
1290          *                               (e.g. 'fr:Test page')
1291          */
1292         public function setLanguageLinks( array $newLinkArray ) {
1293                 $this->mLanguageLinks = $newLinkArray;
1294         }
1295
1296         /**
1297          * Get the list of language links
1298          *
1299          * @return string[] Array of interwiki-prefixed (non DB key) titles (e.g. 'fr:Test page')
1300          */
1301         public function getLanguageLinks() {
1302                 return $this->mLanguageLinks;
1303         }
1304
1305         /**
1306          * Add an array of categories, with names in the keys
1307          *
1308          * @param array $categories Mapping category name => sort key
1309          */
1310         public function addCategoryLinks( array $categories ) {
1311                 if ( !$categories ) {
1312                         return;
1313                 }
1314
1315                 $res = $this->addCategoryLinksToLBAndGetResult( $categories );
1316
1317                 # Set all the values to 'normal'.
1318                 $categories = array_fill_keys( array_keys( $categories ), 'normal' );
1319
1320                 # Mark hidden categories
1321                 foreach ( $res as $row ) {
1322                         if ( isset( $row->pp_value ) ) {
1323                                 $categories[$row->page_title] = 'hidden';
1324                         }
1325                 }
1326
1327                 // Avoid PHP 7.1 warning of passing $this by reference
1328                 $outputPage = $this;
1329                 # Add the remaining categories to the skin
1330                 if ( Hooks::run(
1331                         'OutputPageMakeCategoryLinks',
1332                         [ &$outputPage, $categories, &$this->mCategoryLinks ] )
1333                 ) {
1334                         $services = MediaWikiServices::getInstance();
1335                         $linkRenderer = $services->getLinkRenderer();
1336                         foreach ( $categories as $category => $type ) {
1337                                 // array keys will cast numeric category names to ints, so cast back to string
1338                                 $category = (string)$category;
1339                                 $origcategory = $category;
1340                                 $title = Title::makeTitleSafe( NS_CATEGORY, $category );
1341                                 if ( !$title ) {
1342                                         continue;
1343                                 }
1344                                 $services->getContentLanguage()->findVariantLink( $category, $title, true );
1345                                 if ( $category != $origcategory && array_key_exists( $category, $categories ) ) {
1346                                         continue;
1347                                 }
1348                                 $text = $services->getContentLanguage()->convertHtml( $title->getText() );
1349                                 $this->mCategories[$type][] = $title->getText();
1350                                 $this->mCategoryLinks[$type][] = $linkRenderer->makeLink( $title, new HtmlArmor( $text ) );
1351                         }
1352                 }
1353         }
1354
1355         /**
1356          * @param array $categories
1357          * @return bool|IResultWrapper
1358          */
1359         protected function addCategoryLinksToLBAndGetResult( array $categories ) {
1360                 # Add the links to a LinkBatch
1361                 $arr = [ NS_CATEGORY => $categories ];
1362                 $lb = new LinkBatch;
1363                 $lb->setArray( $arr );
1364
1365                 # Fetch existence plus the hiddencat property
1366                 $dbr = wfGetDB( DB_REPLICA );
1367                 $fields = array_merge(
1368                         LinkCache::getSelectFields(),
1369                         [ 'page_namespace', 'page_title', 'pp_value' ]
1370                 );
1371
1372                 $res = $dbr->select( [ 'page', 'page_props' ],
1373                         $fields,
1374                         $lb->constructSet( 'page', $dbr ),
1375                         __METHOD__,
1376                         [],
1377                         [ 'page_props' => [ 'LEFT JOIN', [
1378                                 'pp_propname' => 'hiddencat',
1379                                 'pp_page = page_id'
1380                         ] ] ]
1381                 );
1382
1383                 # Add the results to the link cache
1384                 $linkCache = MediaWikiServices::getInstance()->getLinkCache();
1385                 $lb->addResultToCache( $linkCache, $res );
1386
1387                 return $res;
1388         }
1389
1390         /**
1391          * Reset the category links (but not the category list) and add $categories
1392          *
1393          * @param array $categories Mapping category name => sort key
1394          */
1395         public function setCategoryLinks( array $categories ) {
1396                 $this->mCategoryLinks = [];
1397                 $this->addCategoryLinks( $categories );
1398         }
1399
1400         /**
1401          * Get the list of category links, in a 2-D array with the following format:
1402          * $arr[$type][] = $link, where $type is either "normal" or "hidden" (for
1403          * hidden categories) and $link a HTML fragment with a link to the category
1404          * page
1405          *
1406          * @return array
1407          */
1408         public function getCategoryLinks() {
1409                 return $this->mCategoryLinks;
1410         }
1411
1412         /**
1413          * Get the list of category names this page belongs to.
1414          *
1415          * @param string $type The type of categories which should be returned. Possible values:
1416          *  * all: all categories of all types
1417          *  * hidden: only the hidden categories
1418          *  * normal: all categories, except hidden categories
1419          * @return array Array of strings
1420          */
1421         public function getCategories( $type = 'all' ) {
1422                 if ( $type === 'all' ) {
1423                         $allCategories = [];
1424                         foreach ( $this->mCategories as $categories ) {
1425                                 $allCategories = array_merge( $allCategories, $categories );
1426                         }
1427                         return $allCategories;
1428                 }
1429                 if ( !isset( $this->mCategories[$type] ) ) {
1430                         throw new InvalidArgumentException( 'Invalid category type given: ' . $type );
1431                 }
1432                 return $this->mCategories[$type];
1433         }
1434
1435         /**
1436          * Add an array of indicators, with their identifiers as array
1437          * keys and HTML contents as values.
1438          *
1439          * In case of duplicate keys, existing values are overwritten.
1440          *
1441          * @param array $indicators
1442          * @since 1.25
1443          */
1444         public function setIndicators( array $indicators ) {
1445                 $this->mIndicators = $indicators + $this->mIndicators;
1446                 // Keep ordered by key
1447                 ksort( $this->mIndicators );
1448         }
1449
1450         /**
1451          * Get the indicators associated with this page.
1452          *
1453          * The array will be internally ordered by item keys.
1454          *
1455          * @return array Keys: identifiers, values: HTML contents
1456          * @since 1.25
1457          */
1458         public function getIndicators() {
1459                 return $this->mIndicators;
1460         }
1461
1462         /**
1463          * Adds help link with an icon via page indicators.
1464          * Link target can be overridden by a local message containing a wikilink:
1465          * the message key is: lowercase action or special page name + '-helppage'.
1466          * @param string $to Target MediaWiki.org page title or encoded URL.
1467          * @param bool $overrideBaseUrl Whether $url is a full URL, to avoid MW.o.
1468          * @since 1.25
1469          */
1470         public function addHelpLink( $to, $overrideBaseUrl = false ) {
1471                 $this->addModuleStyles( 'mediawiki.helplink' );
1472                 $text = $this->msg( 'helppage-top-gethelp' )->escaped();
1473
1474                 if ( $overrideBaseUrl ) {
1475                         $helpUrl = $to;
1476                 } else {
1477                         $toUrlencoded = wfUrlencode( str_replace( ' ', '_', $to ) );
1478                         $helpUrl = "https://www.mediawiki.org/wiki/Special:MyLanguage/$toUrlencoded";
1479                 }
1480
1481                 $link = Html::rawElement(
1482                         'a',
1483                         [
1484                                 'href' => $helpUrl,
1485                                 'target' => '_blank',
1486                                 'class' => 'mw-helplink',
1487                         ],
1488                         $text
1489                 );
1490
1491                 $this->setIndicators( [ 'mw-helplink' => $link ] );
1492         }
1493
1494         /**
1495          * Do not allow scripts which can be modified by wiki users to load on this page;
1496          * only allow scripts bundled with, or generated by, the software.
1497          * Site-wide styles are controlled by a config setting, since they can be
1498          * used to create a custom skin/theme, but not user-specific ones.
1499          *
1500          * @todo this should be given a more accurate name
1501          */
1502         public function disallowUserJs() {
1503                 $this->reduceAllowedModules(
1504                         ResourceLoaderModule::TYPE_SCRIPTS,
1505                         ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL
1506                 );
1507
1508                 // Site-wide styles are controlled by a config setting, see T73621
1509                 // for background on why. User styles are never allowed.
1510                 if ( $this->getConfig()->get( 'AllowSiteCSSOnRestrictedPages' ) ) {
1511                         $styleOrigin = ResourceLoaderModule::ORIGIN_USER_SITEWIDE;
1512                 } else {
1513                         $styleOrigin = ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL;
1514                 }
1515                 $this->reduceAllowedModules(
1516                         ResourceLoaderModule::TYPE_STYLES,
1517                         $styleOrigin
1518                 );
1519         }
1520
1521         /**
1522          * Show what level of JavaScript / CSS untrustworthiness is allowed on this page
1523          * @see ResourceLoaderModule::$origin
1524          * @param string $type ResourceLoaderModule TYPE_ constant
1525          * @return int ResourceLoaderModule ORIGIN_ class constant
1526          */
1527         public function getAllowedModules( $type ) {
1528                 if ( $type == ResourceLoaderModule::TYPE_COMBINED ) {
1529                         return min( array_values( $this->mAllowedModules ) );
1530                 } else {
1531                         return $this->mAllowedModules[$type] ?? ResourceLoaderModule::ORIGIN_ALL;
1532                 }
1533         }
1534
1535         /**
1536          * Limit the highest level of CSS/JS untrustworthiness allowed.
1537          *
1538          * If passed the same or a higher level than the current level of untrustworthiness set, the
1539          * level will remain unchanged.
1540          *
1541          * @param string $type
1542          * @param int $level ResourceLoaderModule class constant
1543          */
1544         public function reduceAllowedModules( $type, $level ) {
1545                 $this->mAllowedModules[$type] = min( $this->getAllowedModules( $type ), $level );
1546         }
1547
1548         /**
1549          * Prepend $text to the body HTML
1550          *
1551          * @param string $text HTML
1552          */
1553         public function prependHTML( $text ) {
1554                 $this->mBodytext = $text . $this->mBodytext;
1555         }
1556
1557         /**
1558          * Append $text to the body HTML
1559          *
1560          * @param string $text HTML
1561          */
1562         public function addHTML( $text ) {
1563                 $this->mBodytext .= $text;
1564         }
1565
1566         /**
1567          * Shortcut for adding an Html::element via addHTML.
1568          *
1569          * @since 1.19
1570          *
1571          * @param string $element
1572          * @param array $attribs
1573          * @param string $contents
1574          */
1575         public function addElement( $element, array $attribs = [], $contents = '' ) {
1576                 $this->addHTML( Html::element( $element, $attribs, $contents ) );
1577         }
1578
1579         /**
1580          * Clear the body HTML
1581          */
1582         public function clearHTML() {
1583                 $this->mBodytext = '';
1584         }
1585
1586         /**
1587          * Get the body HTML
1588          *
1589          * @return string HTML
1590          */
1591         public function getHTML() {
1592                 return $this->mBodytext;
1593         }
1594
1595         /**
1596          * Get/set the ParserOptions object to use for wikitext parsing
1597          *
1598          * @param ParserOptions|null $options Either the ParserOption to use or null to only get the
1599          *   current ParserOption object. This parameter is deprecated since 1.31.
1600          * @return ParserOptions
1601          */
1602         public function parserOptions( $options = null ) {
1603                 if ( $options !== null ) {
1604                         wfDeprecated( __METHOD__ . ' with non-null $options', '1.31' );
1605                 }
1606
1607                 if ( $options !== null && !empty( $options->isBogus ) ) {
1608                         // Someone is trying to set a bogus pre-$wgUser PO. Check if it has
1609                         // been changed somehow, and keep it if so.
1610                         $anonPO = ParserOptions::newFromAnon();
1611                         $anonPO->setAllowUnsafeRawHtml( false );
1612                         if ( !$options->matches( $anonPO ) ) {
1613                                 wfLogWarning( __METHOD__ . ': Setting a changed bogus ParserOptions: ' . wfGetAllCallers( 5 ) );
1614                                 $options->isBogus = false;
1615                         }
1616                 }
1617
1618                 if ( !$this->mParserOptions ) {
1619                         if ( !$this->getUser()->isSafeToLoad() ) {
1620                                 // $wgUser isn't unstubbable yet, so don't try to get a
1621                                 // ParserOptions for it. And don't cache this ParserOptions
1622                                 // either.
1623                                 $po = ParserOptions::newFromAnon();
1624                                 $po->setAllowUnsafeRawHtml( false );
1625                                 $po->isBogus = true;
1626                                 if ( $options !== null ) {
1627                                         $this->mParserOptions = empty( $options->isBogus ) ? $options : null;
1628                                 }
1629                                 return $po;
1630                         }
1631
1632                         $this->mParserOptions = ParserOptions::newFromContext( $this->getContext() );
1633                         $this->mParserOptions->setAllowUnsafeRawHtml( false );
1634                 }
1635
1636                 if ( $options !== null && !empty( $options->isBogus ) ) {
1637                         // They're trying to restore the bogus pre-$wgUser PO. Do the right
1638                         // thing.
1639                         return wfSetVar( $this->mParserOptions, null, true );
1640                 } else {
1641                         return wfSetVar( $this->mParserOptions, $options );
1642                 }
1643         }
1644
1645         /**
1646          * Set the revision ID which will be seen by the wiki text parser
1647          * for things such as embedded {{REVISIONID}} variable use.
1648          *
1649          * @param int|null $revid A positive integer, or null
1650          * @return mixed Previous value
1651          */
1652         public function setRevisionId( $revid ) {
1653                 $val = is_null( $revid ) ? null : intval( $revid );
1654                 return wfSetVar( $this->mRevisionId, $val, true );
1655         }
1656
1657         /**
1658          * Get the displayed revision ID
1659          *
1660          * @return int
1661          */
1662         public function getRevisionId() {
1663                 return $this->mRevisionId;
1664         }
1665
1666         /**
1667          * Whether the revision displayed is the latest revision of the page
1668          *
1669          * @since 1.34
1670          * @return bool
1671          */
1672         public function isRevisionCurrent() {
1673                 return $this->mRevisionId == 0 || $this->mRevisionId == $this->getTitle()->getLatestRevID();
1674         }
1675
1676         /**
1677          * Set the timestamp of the revision which will be displayed. This is used
1678          * to avoid a extra DB call in Skin::lastModified().
1679          *
1680          * @param string|null $timestamp
1681          * @return mixed Previous value
1682          */
1683         public function setRevisionTimestamp( $timestamp ) {
1684                 return wfSetVar( $this->mRevisionTimestamp, $timestamp, true );
1685         }
1686
1687         /**
1688          * Get the timestamp of displayed revision.
1689          * This will be null if not filled by setRevisionTimestamp().
1690          *
1691          * @return string|null
1692          */
1693         public function getRevisionTimestamp() {
1694                 return $this->mRevisionTimestamp;
1695         }
1696
1697         /**
1698          * Set the displayed file version
1699          *
1700          * @param File|null $file
1701          * @return mixed Previous value
1702          */
1703         public function setFileVersion( $file ) {
1704                 $val = null;
1705                 if ( $file instanceof File && $file->exists() ) {
1706                         $val = [ 'time' => $file->getTimestamp(), 'sha1' => $file->getSha1() ];
1707                 }
1708                 return wfSetVar( $this->mFileVersion, $val, true );
1709         }
1710
1711         /**
1712          * Get the displayed file version
1713          *
1714          * @return array|null ('time' => MW timestamp, 'sha1' => sha1)
1715          */
1716         public function getFileVersion() {
1717                 return $this->mFileVersion;
1718         }
1719
1720         /**
1721          * Get the templates used on this page
1722          *
1723          * @return array (namespace => dbKey => revId)
1724          * @since 1.18
1725          */
1726         public function getTemplateIds() {
1727                 return $this->mTemplateIds;
1728         }
1729
1730         /**
1731          * Get the files used on this page
1732          *
1733          * @return array [ dbKey => [ 'time' => MW timestamp or null, 'sha1' => sha1 or '' ] ]
1734          * @since 1.18
1735          */
1736         public function getFileSearchOptions() {
1737                 return $this->mImageTimeKeys;
1738         }
1739
1740         /**
1741          * Convert wikitext *in the user interface language* to HTML and
1742          * add it to the buffer. The result will not be
1743          * language-converted, as user interface messages are already
1744          * localized into a specific variant.  Assumes that the current
1745          * page title will be used if optional $title is not
1746          * provided. Output will be tidy.
1747          *
1748          * @param string $text Wikitext in the user interface language
1749          * @param bool $linestart Is this the start of a line? (Defaults to true)
1750          * @param Title|null $title Optional title to use; default of `null`
1751          *   means use current page title.
1752          * @throws MWException if $title is not provided and OutputPage::getTitle()
1753          *   is null
1754          * @since 1.32
1755          */
1756         public function addWikiTextAsInterface(
1757                 $text, $linestart = true, Title $title = null
1758         ) {
1759                 if ( $title === null ) {
1760                         $title = $this->getTitle();
1761                 }
1762                 if ( !$title ) {
1763                         throw new MWException( 'Title is null' );
1764                 }
1765                 $this->addWikiTextTitleInternal( $text, $title, $linestart, /*interface*/true );
1766         }
1767
1768         /**
1769          * Convert wikitext *in the user interface language* to HTML and
1770          * add it to the buffer with a `<div class="$wrapperClass">`
1771          * wrapper.  The result will not be language-converted, as user
1772          * interface messages as already localized into a specific
1773          * variant.  The $text will be parsed in start-of-line context.
1774          * Output will be tidy.
1775          *
1776          * @param string $wrapperClass The class attribute value for the <div>
1777          *   wrapper in the output HTML
1778          * @param string $text Wikitext in the user interface language
1779          * @since 1.32
1780          */
1781         public function wrapWikiTextAsInterface(
1782                 $wrapperClass, $text
1783         ) {
1784                 $this->addWikiTextTitleInternal(
1785                         $text, $this->getTitle(),
1786                         /*linestart*/true, /*interface*/true,
1787                         $wrapperClass
1788                 );
1789         }
1790
1791         /**
1792          * Convert wikitext *in the page content language* to HTML and add
1793          * it to the buffer.  The result with be language-converted to the
1794          * user's preferred variant.  Assumes that the current page title
1795          * will be used if optional $title is not provided. Output will be
1796          * tidy.
1797          *
1798          * @param string $text Wikitext in the page content language
1799          * @param bool $linestart Is this the start of a line? (Defaults to true)
1800          * @param Title|null $title Optional title to use; default of `null`
1801          *   means use current page title.
1802          * @throws MWException if $title is not provided and OutputPage::getTitle()
1803          *   is null
1804          * @since 1.32
1805          */
1806         public function addWikiTextAsContent(
1807                 $text, $linestart = true, Title $title = null
1808         ) {
1809                 if ( $title === null ) {
1810                         $title = $this->getTitle();
1811                 }
1812                 if ( !$title ) {
1813                         throw new MWException( 'Title is null' );
1814                 }
1815                 $this->addWikiTextTitleInternal( $text, $title, $linestart, /*interface*/false );
1816         }
1817
1818         /**
1819          * Add wikitext with a custom Title object.
1820          * Output is unwrapped.
1821          *
1822          * @param string $text Wikitext
1823          * @param Title $title
1824          * @param bool $linestart Is this the start of a line?
1825          * @param bool $interface Whether it is an interface message
1826          *   (for example disables conversion)
1827          * @param string $wrapperClass if not empty, wraps the output in
1828          *   a `<div class="$wrapperClass">`
1829          */
1830         private function addWikiTextTitleInternal(
1831                 $text, Title $title, $linestart, $interface, $wrapperClass = null
1832         ) {
1833                 $parserOutput = $this->parseInternal(
1834                         $text, $title, $linestart, true, $interface, /*language*/null
1835                 );
1836
1837                 $this->addParserOutput( $parserOutput, [
1838                         'enableSectionEditLinks' => false,
1839                         'wrapperDivClass' => $wrapperClass ?? '',
1840                 ] );
1841         }
1842
1843         /**
1844          * Add all metadata associated with a ParserOutput object, but without the actual HTML. This
1845          * includes categories, language links, ResourceLoader modules, effects of certain magic words,
1846          * and so on.
1847          *
1848          * @since 1.24
1849          * @param ParserOutput $parserOutput
1850          */
1851         public function addParserOutputMetadata( ParserOutput $parserOutput ) {
1852                 $this->mLanguageLinks =
1853                         array_merge( $this->mLanguageLinks, $parserOutput->getLanguageLinks() );
1854                 $this->addCategoryLinks( $parserOutput->getCategories() );
1855                 $this->setIndicators( $parserOutput->getIndicators() );
1856                 $this->mNewSectionLink = $parserOutput->getNewSection();
1857                 $this->mHideNewSectionLink = $parserOutput->getHideNewSection();
1858
1859                 if ( !$parserOutput->isCacheable() ) {
1860                         $this->enableClientCache( false );
1861                 }
1862                 $this->mNoGallery = $parserOutput->getNoGallery();
1863                 $this->mHeadItems = array_merge( $this->mHeadItems, $parserOutput->getHeadItems() );
1864                 $this->addModules( $parserOutput->getModules() );
1865                 $this->addModuleStyles( $parserOutput->getModuleStyles() );
1866                 $this->addJsConfigVars( $parserOutput->getJsConfigVars() );
1867                 $this->mPreventClickjacking = $this->mPreventClickjacking
1868                         || $parserOutput->preventClickjacking();
1869
1870                 // Template versioning...
1871                 foreach ( (array)$parserOutput->getTemplateIds() as $ns => $dbks ) {
1872                         if ( isset( $this->mTemplateIds[$ns] ) ) {
1873                                 $this->mTemplateIds[$ns] = $dbks + $this->mTemplateIds[$ns];
1874                         } else {
1875                                 $this->mTemplateIds[$ns] = $dbks;
1876                         }
1877                 }
1878                 // File versioning...
1879                 foreach ( (array)$parserOutput->getFileSearchOptions() as $dbk => $data ) {
1880                         $this->mImageTimeKeys[$dbk] = $data;
1881                 }
1882
1883                 // Hooks registered in the object
1884                 $parserOutputHooks = $this->getConfig()->get( 'ParserOutputHooks' );
1885                 foreach ( $parserOutput->getOutputHooks() as $hookInfo ) {
1886                         list( $hookName, $data ) = $hookInfo;
1887                         if ( isset( $parserOutputHooks[$hookName] ) ) {
1888                                 $parserOutputHooks[$hookName]( $this, $parserOutput, $data );
1889                         }
1890                 }
1891
1892                 // Enable OOUI if requested via ParserOutput
1893                 if ( $parserOutput->getEnableOOUI() ) {
1894                         $this->enableOOUI();
1895                 }
1896
1897                 // Include parser limit report
1898                 if ( !$this->limitReportJSData ) {
1899                         $this->limitReportJSData = $parserOutput->getLimitReportJSData();
1900                 }
1901
1902                 // Link flags are ignored for now, but may in the future be
1903                 // used to mark individual language links.
1904                 $linkFlags = [];
1905                 // Avoid PHP 7.1 warning of passing $this by reference
1906                 $outputPage = $this;
1907                 Hooks::run( 'LanguageLinks', [ $this->getTitle(), &$this->mLanguageLinks, &$linkFlags ] );
1908                 Hooks::runWithoutAbort( 'OutputPageParserOutput', [ &$outputPage, $parserOutput ] );
1909
1910                 // This check must be after 'OutputPageParserOutput' runs in addParserOutputMetadata
1911                 // so that extensions may modify ParserOutput to toggle TOC.
1912                 // This cannot be moved to addParserOutputText because that is not
1913                 // called by EditPage for Preview.
1914                 if ( $parserOutput->getTOCHTML() ) {
1915                         $this->mEnableTOC = true;
1916                 }
1917         }
1918
1919         /**
1920          * Add the HTML and enhancements for it (like ResourceLoader modules) associated with a
1921          * ParserOutput object, without any other metadata.
1922          *
1923          * @since 1.24
1924          * @param ParserOutput $parserOutput
1925          * @param array $poOptions Options to ParserOutput::getText()
1926          */
1927         public function addParserOutputContent( ParserOutput $parserOutput, $poOptions = [] ) {
1928                 $this->addParserOutputText( $parserOutput, $poOptions );
1929
1930                 $this->addModules( $parserOutput->getModules() );
1931                 $this->addModuleStyles( $parserOutput->getModuleStyles() );
1932
1933                 $this->addJsConfigVars( $parserOutput->getJsConfigVars() );
1934         }
1935
1936         /**
1937          * Add the HTML associated with a ParserOutput object, without any metadata.
1938          *
1939          * @since 1.24
1940          * @param ParserOutput $parserOutput
1941          * @param array $poOptions Options to ParserOutput::getText()
1942          */
1943         public function addParserOutputText( ParserOutput $parserOutput, $poOptions = [] ) {
1944                 $text = $parserOutput->getText( $poOptions );
1945                 // Avoid PHP 7.1 warning of passing $this by reference
1946                 $outputPage = $this;
1947                 Hooks::runWithoutAbort( 'OutputPageBeforeHTML', [ &$outputPage, &$text ] );
1948                 $this->addHTML( $text );
1949         }
1950
1951         /**
1952          * Add everything from a ParserOutput object.
1953          *
1954          * @param ParserOutput $parserOutput
1955          * @param array $poOptions Options to ParserOutput::getText()
1956          */
1957         function addParserOutput( ParserOutput $parserOutput, $poOptions = [] ) {
1958                 $this->addParserOutputMetadata( $parserOutput );
1959                 $this->addParserOutputText( $parserOutput, $poOptions );
1960         }
1961
1962         /**
1963          * Add the output of a QuickTemplate to the output buffer
1964          *
1965          * @param QuickTemplate &$template
1966          */
1967         public function addTemplate( &$template ) {
1968                 $this->addHTML( $template->getHTML() );
1969         }
1970
1971         /**
1972          * Parse wikitext and return the HTML.
1973          *
1974          * @todo The output is wrapped in a <div> iff $interface is false; it's
1975          * probably best to always strip the wrapper.
1976          *
1977          * @param string $text
1978          * @param bool $linestart Is this the start of a line?
1979          * @param bool $interface Use interface language (instead of content language) while parsing
1980          *   language sensitive magic words like GRAMMAR and PLURAL.  This also disables
1981          *   LanguageConverter.
1982          * @param Language|null $language Target language object, will override $interface
1983          * @throws MWException
1984          * @return string HTML
1985          * @deprecated since 1.32, due to untidy output and inconsistent wrapper;
1986          *  use parseAsContent() if $interface is default value or false, or else
1987          *  parseAsInterface() if $interface is true.
1988          */
1989         public function parse( $text, $linestart = true, $interface = false, $language = null ) {
1990                 wfDeprecated( __METHOD__, '1.33' );
1991                 return $this->parseInternal(
1992                         $text, $this->getTitle(), $linestart, /*tidy*/false, $interface, $language
1993                 )->getText( [
1994                         'enableSectionEditLinks' => false,
1995                 ] );
1996         }
1997
1998         /**
1999          * Parse wikitext *in the page content language* and return the HTML.
2000          * The result will be language-converted to the user's preferred variant.
2001          * Output will be tidy.
2002          *
2003          * @param string $text Wikitext in the page content language
2004          * @param bool $linestart Is this the start of a line? (Defaults to true)
2005          * @throws MWException
2006          * @return string HTML
2007          * @since 1.32
2008          */
2009         public function parseAsContent( $text, $linestart = true ) {
2010                 return $this->parseInternal(
2011                         $text, $this->getTitle(), $linestart, /*tidy*/true, /*interface*/false, /*language*/null
2012                 )->getText( [
2013                         'enableSectionEditLinks' => false,
2014                         'wrapperDivClass' => ''
2015                 ] );
2016         }
2017
2018         /**
2019          * Parse wikitext *in the user interface language* and return the HTML.
2020          * The result will not be language-converted, as user interface messages
2021          * are already localized into a specific variant.
2022          * Output will be tidy.
2023          *
2024          * @param string $text Wikitext in the user interface language
2025          * @param bool $linestart Is this the start of a line? (Defaults to true)
2026          * @throws MWException
2027          * @return string HTML
2028          * @since 1.32
2029          */
2030         public function parseAsInterface( $text, $linestart = true ) {
2031                 return $this->parseInternal(
2032                         $text, $this->getTitle(), $linestart, /*tidy*/true, /*interface*/true, /*language*/null
2033                 )->getText( [
2034                         'enableSectionEditLinks' => false,
2035                         'wrapperDivClass' => ''
2036                 ] );
2037         }
2038
2039         /**
2040          * Parse wikitext *in the user interface language*, strip
2041          * paragraph wrapper, and return the HTML.
2042          * The result will not be language-converted, as user interface messages
2043          * are already localized into a specific variant.
2044          * Output will be tidy.  Outer paragraph wrapper will only be stripped
2045          * if the result is a single paragraph.
2046          *
2047          * @param string $text Wikitext in the user interface language
2048          * @param bool $linestart Is this the start of a line? (Defaults to true)
2049          * @throws MWException
2050          * @return string HTML
2051          * @since 1.32
2052          */
2053         public function parseInlineAsInterface( $text, $linestart = true ) {
2054                 return Parser::stripOuterParagraph(
2055                         $this->parseAsInterface( $text, $linestart )
2056                 );
2057         }
2058
2059         /**
2060          * Parse wikitext, strip paragraph wrapper, and return the HTML.
2061          *
2062          * @param string $text
2063          * @param bool $linestart Is this the start of a line?
2064          * @param bool $interface Use interface language (instead of content language) while parsing
2065          *   language sensitive magic words like GRAMMAR and PLURAL
2066          * @return string HTML
2067          * @deprecated since 1.32, due to untidy output and confusing default
2068          *   for $interface.  Use parseInlineAsInterface() if $interface is
2069          *   the default value or false, or else use
2070          *   Parser::stripOuterParagraph($outputPage->parseAsContent(...)).
2071          */
2072         public function parseInline( $text, $linestart = true, $interface = false ) {
2073                 wfDeprecated( __METHOD__, '1.33' );
2074                 $parsed = $this->parseInternal(
2075                         $text, $this->getTitle(), $linestart, /*tidy*/false, $interface, /*language*/null
2076                 )->getText( [
2077                         'enableSectionEditLinks' => false,
2078                         'wrapperDivClass' => '', /* no wrapper div */
2079                 ] );
2080                 return Parser::stripOuterParagraph( $parsed );
2081         }
2082
2083         /**
2084          * Parse wikitext and return the HTML (internal implementation helper)
2085          *
2086          * @param string $text
2087          * @param Title $title The title to use
2088          * @param bool $linestart Is this the start of a line?
2089          * @param bool $tidy Whether the output should be tidied
2090          * @param bool $interface Use interface language (instead of content language) while parsing
2091          *   language sensitive magic words like GRAMMAR and PLURAL.  This also disables
2092          *   LanguageConverter.
2093          * @param Language|null $language Target language object, will override $interface
2094          * @throws MWException
2095          * @return ParserOutput
2096          */
2097         private function parseInternal( $text, $title, $linestart, $tidy, $interface, $language ) {
2098                 if ( is_null( $title ) ) {
2099                         throw new MWException( 'Empty $mTitle in ' . __METHOD__ );
2100                 }
2101
2102                 $popts = $this->parserOptions();
2103                 $oldTidy = $popts->setTidy( $tidy );
2104                 $oldInterface = $popts->setInterfaceMessage( (bool)$interface );
2105
2106                 if ( $language !== null ) {
2107                         $oldLang = $popts->setTargetLanguage( $language );
2108                 }
2109
2110                 $parserOutput = MediaWikiServices::getInstance()->getParser()->getFreshParser()->parse(
2111                         $text, $title, $popts,
2112                         $linestart, true, $this->mRevisionId
2113                 );
2114
2115                 $popts->setTidy( $oldTidy );
2116                 $popts->setInterfaceMessage( $oldInterface );
2117
2118                 if ( $language !== null ) {
2119                         $popts->setTargetLanguage( $oldLang );
2120                 }
2121
2122                 return $parserOutput;
2123         }
2124
2125         /**
2126          * Set the value of the "s-maxage" part of the "Cache-control" HTTP header
2127          *
2128          * @param int $maxage Maximum cache time on the CDN, in seconds.
2129          */
2130         public function setCdnMaxage( $maxage ) {
2131                 $this->mCdnMaxage = min( $maxage, $this->mCdnMaxageLimit );
2132         }
2133
2134         /**
2135          * Set the value of the "s-maxage" part of the "Cache-control" HTTP header to $maxage if that is
2136          * lower than the current s-maxage.  Either way, $maxage is now an upper limit on s-maxage, so
2137          * that future calls to setCdnMaxage() will no longer be able to raise the s-maxage above
2138          * $maxage.
2139          *
2140          * @param int $maxage Maximum cache time on the CDN, in seconds
2141          * @since 1.27
2142          */
2143         public function lowerCdnMaxage( $maxage ) {
2144                 $this->mCdnMaxageLimit = min( $maxage, $this->mCdnMaxageLimit );
2145                 $this->setCdnMaxage( $this->mCdnMaxage );
2146         }
2147
2148         /**
2149          * Get TTL in [$minTTL,$maxTTL] in pass it to lowerCdnMaxage()
2150          *
2151          * This sets and returns $minTTL if $mtime is false or null. Otherwise,
2152          * the TTL is higher the older the $mtime timestamp is. Essentially, the
2153          * TTL is 90% of the age of the object, subject to the min and max.
2154          *
2155          * @param string|int|float|bool|null $mtime Last-Modified timestamp
2156          * @param int $minTTL Minimum TTL in seconds [default: 1 minute]
2157          * @param int $maxTTL Maximum TTL in seconds [default: $wgCdnMaxAge]
2158          * @since 1.28
2159          */
2160         public function adaptCdnTTL( $mtime, $minTTL = 0, $maxTTL = 0 ) {
2161                 $minTTL = $minTTL ?: IExpiringStore::TTL_MINUTE;
2162                 $maxTTL = $maxTTL ?: $this->getConfig()->get( 'CdnMaxAge' );
2163
2164                 if ( $mtime === null || $mtime === false ) {
2165                         return $minTTL; // entity does not exist
2166                 }
2167
2168                 $age = MWTimestamp::time() - wfTimestamp( TS_UNIX, $mtime );
2169                 $adaptiveTTL = max( 0.9 * $age, $minTTL );
2170                 $adaptiveTTL = min( $adaptiveTTL, $maxTTL );
2171
2172                 $this->lowerCdnMaxage( (int)$adaptiveTTL );
2173         }
2174
2175         /**
2176          * Use enableClientCache(false) to force it to send nocache headers
2177          *
2178          * @param bool|null $state New value, or null to not set the value
2179          *
2180          * @return bool Old value
2181          */
2182         public function enableClientCache( $state ) {
2183                 return wfSetVar( $this->mEnableClientCache, $state );
2184         }
2185
2186         /**
2187          * Get the list of cookie names that will influence the cache
2188          *
2189          * @return array
2190          */
2191         function getCacheVaryCookies() {
2192                 if ( self::$cacheVaryCookies === null ) {
2193                         $config = $this->getConfig();
2194                         self::$cacheVaryCookies = array_values( array_unique( array_merge(
2195                                 SessionManager::singleton()->getVaryCookies(),
2196                                 [
2197                                         'forceHTTPS',
2198                                 ],
2199                                 $config->get( 'CacheVaryCookies' )
2200                         ) ) );
2201                         Hooks::run( 'GetCacheVaryCookies', [ $this, &self::$cacheVaryCookies ] );
2202                 }
2203                 return self::$cacheVaryCookies;
2204         }
2205
2206         /**
2207          * Check if the request has a cache-varying cookie header
2208          * If it does, it's very important that we don't allow public caching
2209          *
2210          * @return bool
2211          */
2212         function haveCacheVaryCookies() {
2213                 $request = $this->getRequest();
2214                 foreach ( $this->getCacheVaryCookies() as $cookieName ) {
2215                         if ( $request->getCookie( $cookieName, '', '' ) !== '' ) {
2216                                 wfDebug( __METHOD__ . ": found $cookieName\n" );
2217                                 return true;
2218                         }
2219                 }
2220                 wfDebug( __METHOD__ . ": no cache-varying cookies found\n" );
2221                 return false;
2222         }
2223
2224         /**
2225          * Add an HTTP header that will influence on the cache
2226          *
2227          * @param string $header Header name
2228          * @param string[]|null $option Deprecated; formerly options for the
2229          *  Key header, deprecated in 1.32 and removed in 1.34. See
2230          *   https://datatracker.ietf.org/doc/draft-fielding-http-key/
2231          *   for the list of formerly-valid options.
2232          */
2233         public function addVaryHeader( $header, array $option = null ) {
2234                 if ( $option !== null && count( $option ) > 0 ) {
2235                         wfDeprecated( 'addVaryHeader $option is ignored', '1.34' );
2236                 }
2237                 if ( !array_key_exists( $header, $this->mVaryHeader ) ) {
2238                         $this->mVaryHeader[$header] = null;
2239                 }
2240         }
2241
2242         /**
2243          * Return a Vary: header on which to vary caches. Based on the keys of $mVaryHeader,
2244          * such as Accept-Encoding or Cookie
2245          *
2246          * @return string
2247          */
2248         public function getVaryHeader() {
2249                 // If we vary on cookies, let's make sure it's always included here too.
2250                 if ( $this->getCacheVaryCookies() ) {
2251                         $this->addVaryHeader( 'Cookie' );
2252                 }
2253
2254                 foreach ( SessionManager::singleton()->getVaryHeaders() as $header => $options ) {
2255                         $this->addVaryHeader( $header, $options );
2256                 }
2257                 return 'Vary: ' . implode( ', ', array_keys( $this->mVaryHeader ) );
2258         }
2259
2260         /**
2261          * Add an HTTP Link: header
2262          *
2263          * @param string $header Header value
2264          */
2265         public function addLinkHeader( $header ) {
2266                 $this->mLinkHeader[] = $header;
2267         }
2268
2269         /**
2270          * Return a Link: header. Based on the values of $mLinkHeader.
2271          *
2272          * @return string
2273          */
2274         public function getLinkHeader() {
2275                 if ( !$this->mLinkHeader ) {
2276                         return false;
2277                 }
2278
2279                 return 'Link: ' . implode( ',', $this->mLinkHeader );
2280         }
2281
2282         /**
2283          * T23672: Add Accept-Language to Vary header if there's no 'variant' parameter in GET.
2284          *
2285          * For example:
2286          *   /w/index.php?title=Main_page will vary based on Accept-Language; but
2287          *   /w/index.php?title=Main_page&variant=zh-cn will not.
2288          */
2289         private function addAcceptLanguage() {
2290                 $title = $this->getTitle();
2291                 if ( !$title instanceof Title ) {
2292                         return;
2293                 }
2294
2295                 $lang = $title->getPageLanguage();
2296                 if ( !$this->getRequest()->getCheck( 'variant' ) && $lang->hasVariants() ) {
2297                         $this->addVaryHeader( 'Accept-Language' );
2298                 }
2299         }
2300
2301         /**
2302          * Set a flag which will cause an X-Frame-Options header appropriate for
2303          * edit pages to be sent. The header value is controlled by
2304          * $wgEditPageFrameOptions.
2305          *
2306          * This is the default for special pages. If you display a CSRF-protected
2307          * form on an ordinary view page, then you need to call this function.
2308          *
2309          * @param bool $enable
2310          */
2311         public function preventClickjacking( $enable = true ) {
2312                 $this->mPreventClickjacking = $enable;
2313         }
2314
2315         /**
2316          * Turn off frame-breaking. Alias for $this->preventClickjacking(false).
2317          * This can be called from pages which do not contain any CSRF-protected
2318          * HTML form.
2319          */
2320         public function allowClickjacking() {
2321                 $this->mPreventClickjacking = false;
2322         }
2323
2324         /**
2325          * Get the prevent-clickjacking flag
2326          *
2327          * @since 1.24
2328          * @return bool
2329          */
2330         public function getPreventClickjacking() {
2331                 return $this->mPreventClickjacking;
2332         }
2333
2334         /**
2335          * Get the X-Frame-Options header value (without the name part), or false
2336          * if there isn't one. This is used by Skin to determine whether to enable
2337          * JavaScript frame-breaking, for clients that don't support X-Frame-Options.
2338          *
2339          * @return string|false
2340          */
2341         public function getFrameOptions() {
2342                 $config = $this->getConfig();
2343                 if ( $config->get( 'BreakFrames' ) ) {
2344                         return 'DENY';
2345                 } elseif ( $this->mPreventClickjacking && $config->get( 'EditPageFrameOptions' ) ) {
2346                         return $config->get( 'EditPageFrameOptions' );
2347                 }
2348                 return false;
2349         }
2350
2351         /**
2352          * Get the Origin-Trial header values. This is used to enable Chrome Origin
2353          * Trials: https://github.com/GoogleChrome/OriginTrials
2354          *
2355          * @return array
2356          */
2357         private function getOriginTrials() {
2358                 $config = $this->getConfig();
2359
2360                 return $config->get( 'OriginTrials' );
2361         }
2362
2363         private function getReportTo() {
2364                 $config = $this->getConfig();
2365
2366                 $expiry = $config->get( 'ReportToExpiry' );
2367
2368                 if ( !$expiry ) {
2369                         return false;
2370                 }
2371
2372                 $endpoints = $config->get( 'ReportToEndpoints' );
2373
2374                 if ( !$endpoints ) {
2375                         return false;
2376                 }
2377
2378                 $output = [ 'max_age' => $expiry, 'endpoints' => [] ];
2379
2380                 foreach ( $endpoints as $endpoint ) {
2381                         $output['endpoints'][] = [ 'url' => $endpoint ];
2382                 }
2383
2384                 return json_encode( $output, JSON_UNESCAPED_SLASHES );
2385         }
2386
2387         private function getFeaturePolicyReportOnly() {
2388                 $config = $this->getConfig();
2389
2390                 $features = $config->get( 'FeaturePolicyReportOnly' );
2391                 return implode( ';', $features );
2392         }
2393
2394         /**
2395          * Send cache control HTTP headers
2396          */
2397         public function sendCacheControl() {
2398                 $response = $this->getRequest()->response();
2399                 $config = $this->getConfig();
2400
2401                 $this->addVaryHeader( 'Cookie' );
2402                 $this->addAcceptLanguage();
2403
2404                 # don't serve compressed data to clients who can't handle it
2405                 # maintain different caches for logged-in users and non-logged in ones
2406                 $response->header( $this->getVaryHeader() );
2407
2408                 if ( $this->mEnableClientCache ) {
2409                         if (
2410                                 $config->get( 'UseCdn' ) &&
2411                                 !$response->hasCookies() &&
2412                                 !SessionManager::getGlobalSession()->isPersistent() &&
2413                                 !$this->isPrintable() &&
2414                                 $this->mCdnMaxage != 0 &&
2415                                 !$this->haveCacheVaryCookies()
2416                         ) {
2417                                 if ( $config->get( 'UseESI' ) ) {
2418                                         wfDeprecated( '$wgUseESI = true', '1.33' );
2419                                         # We'll purge the proxy cache explicitly, but require end user agents
2420                                         # to revalidate against the proxy on each visit.
2421                                         # Surrogate-Control controls our CDN, Cache-Control downstream caches
2422                                         wfDebug( __METHOD__ .
2423                                                 ": proxy caching with ESI; {$this->mLastModified} **", 'private' );
2424                                         # start with a shorter timeout for initial testing
2425                                         # header( 'Surrogate-Control: max-age=2678400+2678400, content="ESI/1.0"');
2426                                         $response->header(
2427                                                 "Surrogate-Control: max-age={$config->get( 'CdnMaxAge' )}" .
2428                                                 "+{$this->mCdnMaxage}, content=\"ESI/1.0\""
2429                                         );
2430                                         $response->header( 'Cache-Control: s-maxage=0, must-revalidate, max-age=0' );
2431                                 } else {
2432                                         # We'll purge the proxy cache for anons explicitly, but require end user agents
2433                                         # to revalidate against the proxy on each visit.
2434                                         # IMPORTANT! The CDN needs to replace the Cache-Control header with
2435                                         # Cache-Control: s-maxage=0, must-revalidate, max-age=0
2436                                         wfDebug( __METHOD__ .
2437                                                 ": local proxy caching; {$this->mLastModified} **", 'private' );
2438                                         # start with a shorter timeout for initial testing
2439                                         # header( "Cache-Control: s-maxage=2678400, must-revalidate, max-age=0" );
2440                                         $response->header( "Cache-Control: " .
2441                                                 "s-maxage={$this->mCdnMaxage}, must-revalidate, max-age=0" );
2442                                 }
2443                         } else {
2444                                 # We do want clients to cache if they can, but they *must* check for updates
2445                                 # on revisiting the page.
2446                                 wfDebug( __METHOD__ . ": private caching; {$this->mLastModified} **", 'private' );
2447                                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
2448                                 $response->header( "Cache-Control: private, must-revalidate, max-age=0" );
2449                         }
2450                         if ( $this->mLastModified ) {
2451                                 $response->header( "Last-Modified: {$this->mLastModified}" );
2452                         }
2453                 } else {
2454                         wfDebug( __METHOD__ . ": no caching **", 'private' );
2455
2456                         # In general, the absence of a last modified header should be enough to prevent
2457                         # the client from using its cache. We send a few other things just to make sure.
2458                         $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
2459                         $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
2460                         $response->header( 'Pragma: no-cache' );
2461                 }
2462         }
2463
2464         /**
2465          * Transfer styles and JavaScript modules from skin.
2466          *
2467          * @param Skin $sk to load modules for
2468          */
2469         public function loadSkinModules( $sk ) {
2470                 foreach ( $sk->getDefaultModules() as $group => $modules ) {
2471                         if ( $group === 'styles' ) {
2472                                 foreach ( $modules as $key => $moduleMembers ) {
2473                                         $this->addModuleStyles( $moduleMembers );
2474                                 }
2475                         } else {
2476                                 $this->addModules( $modules );
2477                         }
2478                 }
2479         }
2480
2481         /**
2482          * Finally, all the text has been munged and accumulated into
2483          * the object, let's actually output it:
2484          *
2485          * @param bool $return Set to true to get the result as a string rather than sending it
2486          * @return string|null
2487          * @throws Exception
2488          * @throws FatalError
2489          * @throws MWException
2490          */
2491         public function output( $return = false ) {
2492                 if ( $this->mDoNothing ) {
2493                         return $return ? '' : null;
2494                 }
2495
2496                 $response = $this->getRequest()->response();
2497                 $config = $this->getConfig();
2498
2499                 if ( $this->mRedirect != '' ) {
2500                         # Standards require redirect URLs to be absolute
2501                         $this->mRedirect = wfExpandUrl( $this->mRedirect, PROTO_CURRENT );
2502
2503                         $redirect = $this->mRedirect;
2504                         $code = $this->mRedirectCode;
2505
2506                         if ( Hooks::run( "BeforePageRedirect", [ $this, &$redirect, &$code ] ) ) {
2507                                 if ( $code == '301' || $code == '303' ) {
2508                                         if ( !$config->get( 'DebugRedirects' ) ) {
2509                                                 $response->statusHeader( $code );
2510                                         }
2511                                         $this->mLastModified = wfTimestamp( TS_RFC2822 );
2512                                 }
2513                                 if ( $config->get( 'VaryOnXFP' ) ) {
2514                                         $this->addVaryHeader( 'X-Forwarded-Proto' );
2515                                 }
2516                                 $this->sendCacheControl();
2517
2518                                 $response->header( "Content-Type: text/html; charset=utf-8" );
2519                                 if ( $config->get( 'DebugRedirects' ) ) {
2520                                         $url = htmlspecialchars( $redirect );
2521                                         print "<!DOCTYPE html>\n<html>\n<head>\n<title>Redirect</title>\n</head>\n<body>\n";
2522                                         print "<p>Location: <a href=\"$url\">$url</a></p>\n";
2523                                         print "</body>\n</html>\n";
2524                                 } else {
2525                                         $response->header( 'Location: ' . $redirect );
2526                                 }
2527                         }
2528
2529                         return $return ? '' : null;
2530                 } elseif ( $this->mStatusCode ) {
2531                         $response->statusHeader( $this->mStatusCode );
2532                 }
2533
2534                 # Buffer output; final headers may depend on later processing
2535                 ob_start();
2536
2537                 $response->header( 'Content-type: ' . $config->get( 'MimeType' ) . '; charset=UTF-8' );
2538                 $response->header( 'Content-language: ' .
2539                         MediaWikiServices::getInstance()->getContentLanguage()->getHtmlCode() );
2540
2541                 $linkHeader = $this->getLinkHeader();
2542                 if ( $linkHeader ) {
2543                         $response->header( $linkHeader );
2544                 }
2545
2546                 // Prevent framing, if requested
2547                 $frameOptions = $this->getFrameOptions();
2548                 if ( $frameOptions ) {
2549                         $response->header( "X-Frame-Options: $frameOptions" );
2550                 }
2551
2552                 $originTrials = $this->getOriginTrials();
2553                 foreach ( $originTrials as $originTrial ) {
2554                         $response->header( "Origin-Trial: $originTrial", false );
2555                 }
2556
2557                 $reportTo = $this->getReportTo();
2558                 if ( $reportTo ) {
2559                         $response->header( "Report-To: $reportTo" );
2560                 }
2561
2562                 $featurePolicyReportOnly = $this->getFeaturePolicyReportOnly();
2563                 if ( $featurePolicyReportOnly ) {
2564                         $response->header( "Feature-Policy-Report-Only: $featurePolicyReportOnly" );
2565                 }
2566
2567                 ContentSecurityPolicy::sendHeaders( $this );
2568
2569                 if ( $this->mArticleBodyOnly ) {
2570                         echo $this->mBodytext;
2571                 } else {
2572                         // Enable safe mode if requested (T152169)
2573                         if ( $this->getRequest()->getBool( 'safemode' ) ) {
2574                                 $this->disallowUserJs();
2575                         }
2576
2577                         $sk = $this->getSkin();
2578                         $this->loadSkinModules( $sk );
2579
2580                         MWDebug::addModules( $this );
2581
2582                         // Avoid PHP 7.1 warning of passing $this by reference
2583                         $outputPage = $this;
2584                         // Hook that allows last minute changes to the output page, e.g.
2585                         // adding of CSS or Javascript by extensions.
2586                         Hooks::runWithoutAbort( 'BeforePageDisplay', [ &$outputPage, &$sk ] );
2587
2588                         try {
2589                                 $sk->outputPage();
2590                         } catch ( Exception $e ) {
2591                                 ob_end_clean(); // bug T129657
2592                                 throw $e;
2593                         }
2594                 }
2595
2596                 try {
2597                         // This hook allows last minute changes to final overall output by modifying output buffer
2598                         Hooks::runWithoutAbort( 'AfterFinalPageOutput', [ $this ] );
2599                 } catch ( Exception $e ) {
2600                         ob_end_clean(); // bug T129657
2601                         throw $e;
2602                 }
2603
2604                 $this->sendCacheControl();
2605
2606                 if ( $return ) {
2607                         return ob_get_clean();
2608                 } else {
2609                         ob_end_flush();
2610                         return null;
2611                 }
2612         }
2613
2614         /**
2615          * Prepare this object to display an error page; disable caching and
2616          * indexing, clear the current text and redirect, set the page's title
2617          * and optionally an custom HTML title (content of the "<title>" tag).
2618          *
2619          * @param string|Message $pageTitle Will be passed directly to setPageTitle()
2620          * @param string|Message $htmlTitle Will be passed directly to setHTMLTitle();
2621          *                   optional, if not passed the "<title>" attribute will be
2622          *                   based on $pageTitle
2623          */
2624         public function prepareErrorPage( $pageTitle, $htmlTitle = false ) {
2625                 $this->setPageTitle( $pageTitle );
2626                 if ( $htmlTitle !== false ) {
2627                         $this->setHTMLTitle( $htmlTitle );
2628                 }
2629                 $this->setRobotPolicy( 'noindex,nofollow' );
2630                 $this->setArticleRelated( false );
2631                 $this->enableClientCache( false );
2632                 $this->mRedirect = '';
2633                 $this->clearSubtitle();
2634                 $this->clearHTML();
2635         }
2636
2637         /**
2638          * Output a standard error page
2639          *
2640          * showErrorPage( 'titlemsg', 'pagetextmsg' );
2641          * showErrorPage( 'titlemsg', 'pagetextmsg', [ 'param1', 'param2' ] );
2642          * showErrorPage( 'titlemsg', $messageObject );
2643          * showErrorPage( $titleMessageObject, $messageObject );
2644          *
2645          * @param string|Message $title Message key (string) for page title, or a Message object
2646          * @param string|Message $msg Message key (string) for page text, or a Message object
2647          * @param array $params Message parameters; ignored if $msg is a Message object
2648          */
2649         public function showErrorPage( $title, $msg, $params = [] ) {
2650                 if ( !$title instanceof Message ) {
2651                         $title = $this->msg( $title );
2652                 }
2653
2654                 $this->prepareErrorPage( $title );
2655
2656                 if ( $msg instanceof Message ) {
2657                         if ( $params !== [] ) {
2658                                 trigger_error( 'Argument ignored: $params. The message parameters argument '
2659                                         . 'is discarded when the $msg argument is a Message object instead of '
2660                                         . 'a string.', E_USER_NOTICE );
2661                         }
2662                         $this->addHTML( $msg->parseAsBlock() );
2663                 } else {
2664                         $this->addWikiMsgArray( $msg, $params );
2665                 }
2666
2667                 $this->returnToMain();
2668         }
2669
2670         /**
2671          * Output a standard permission error page
2672          *
2673          * @param array $errors Error message keys or [key, param...] arrays
2674          * @param string|null $action Action that was denied or null if unknown
2675          */
2676         public function showPermissionsErrorPage( array $errors, $action = null ) {
2677                 $services = MediaWikiServices::getInstance();
2678                 $permissionManager = $services->getPermissionManager();
2679                 foreach ( $errors as $key => $error ) {
2680                         $errors[$key] = (array)$error;
2681                 }
2682
2683                 // For some action (read, edit, create and upload), display a "login to do this action"
2684                 // error if all of the following conditions are met:
2685                 // 1. the user is not logged in
2686                 // 2. the only error is insufficient permissions (i.e. no block or something else)
2687                 // 3. the error can be avoided simply by logging in
2688
2689                 if ( in_array( $action, [ 'read', 'edit', 'createpage', 'createtalk', 'upload' ] )
2690                         && $this->getUser()->isAnon() && count( $errors ) == 1 && isset( $errors[0][0] )
2691                         && ( $errors[0][0] == 'badaccess-groups' || $errors[0][0] == 'badaccess-group0' )
2692                         && ( $permissionManager->groupHasPermission( 'user', $action )
2693                                 || $permissionManager->groupHasPermission( 'autoconfirmed', $action ) )
2694                 ) {
2695                         $displayReturnto = null;
2696
2697                         # Due to T34276, if a user does not have read permissions,
2698                         # $this->getTitle() will just give Special:Badtitle, which is
2699                         # not especially useful as a returnto parameter. Use the title
2700                         # from the request instead, if there was one.
2701                         $request = $this->getRequest();
2702                         $returnto = Title::newFromText( $request->getVal( 'title', '' ) );
2703                         if ( $action == 'edit' ) {
2704                                 $msg = 'whitelistedittext';
2705                                 $displayReturnto = $returnto;
2706                         } elseif ( $action == 'createpage' || $action == 'createtalk' ) {
2707                                 $msg = 'nocreatetext';
2708                         } elseif ( $action == 'upload' ) {
2709                                 $msg = 'uploadnologintext';
2710                         } else { # Read
2711                                 $msg = 'loginreqpagetext';
2712                                 $displayReturnto = Title::newMainPage();
2713                         }
2714
2715                         $query = [];
2716
2717                         if ( $returnto ) {
2718                                 $query['returnto'] = $returnto->getPrefixedText();
2719
2720                                 if ( !$request->wasPosted() ) {
2721                                         $returntoquery = $request->getValues();
2722                                         unset( $returntoquery['title'] );
2723                                         unset( $returntoquery['returnto'] );
2724                                         unset( $returntoquery['returntoquery'] );
2725                                         $query['returntoquery'] = wfArrayToCgi( $returntoquery );
2726                                 }
2727                         }
2728
2729                         $title = SpecialPage::getTitleFor( 'Userlogin' );
2730                         $linkRenderer = $services->getLinkRenderer();
2731                         $loginUrl = $title->getLinkURL( $query, false, PROTO_RELATIVE );
2732                         $loginLink = $linkRenderer->makeKnownLink(
2733                                 $title,
2734                                 $this->msg( 'loginreqlink' )->text(),
2735                                 [],
2736                                 $query
2737                         );
2738
2739                         $this->prepareErrorPage( $this->msg( 'loginreqtitle' ) );
2740                         $this->addHTML( $this->msg( $msg )->rawParams( $loginLink )->params( $loginUrl )->parse() );
2741
2742                         # Don't return to a page the user can't read otherwise
2743                         # we'll end up in a pointless loop
2744                         if ( $displayReturnto && $permissionManager->userCan(
2745                                 'read', $this->getUser(), $displayReturnto
2746                         ) ) {
2747                                 $this->returnToMain( null, $displayReturnto );
2748                         }
2749                 } else {
2750                         $this->prepareErrorPage( $this->msg( 'permissionserrors' ) );
2751                         $this->addWikiTextAsInterface( $this->formatPermissionsErrorMessage( $errors, $action ) );
2752                 }
2753         }
2754
2755         /**
2756          * Display an error page indicating that a given version of MediaWiki is
2757          * required to use it
2758          *
2759          * @param mixed $version The version of MediaWiki needed to use the page
2760          */
2761         public function versionRequired( $version ) {
2762                 $this->prepareErrorPage( $this->msg( 'versionrequired', $version ) );
2763
2764                 $this->addWikiMsg( 'versionrequiredtext', $version );
2765                 $this->returnToMain();
2766         }
2767
2768         /**
2769          * Format a list of error messages
2770          *
2771          * @param array $errors Array of arrays returned by Title::getUserPermissionsErrors
2772          * @param string|null $action Action that was denied or null if unknown
2773          * @return string The wikitext error-messages, formatted into a list.
2774          */
2775         public function formatPermissionsErrorMessage( array $errors, $action = null ) {
2776                 if ( $action == null ) {
2777                         $text = $this->msg( 'permissionserrorstext', count( $errors ) )->plain() . "\n\n";
2778                 } else {
2779                         $action_desc = $this->msg( "action-$action" )->plain();
2780                         $text = $this->msg(
2781                                 'permissionserrorstext-withaction',
2782                                 count( $errors ),
2783                                 $action_desc
2784                         )->plain() . "\n\n";
2785                 }
2786
2787                 if ( count( $errors ) > 1 ) {
2788                         $text .= '<ul class="permissions-errors">' . "\n";
2789
2790                         foreach ( $errors as $error ) {
2791                                 $text .= '<li>';
2792                                 $text .= $this->msg( ...$error )->plain();
2793                                 $text .= "</li>\n";
2794                         }
2795                         $text .= '</ul>';
2796                 } else {
2797                         $text .= "<div class=\"permissions-errors\">\n" .
2798                                         $this->msg( ...reset( $errors ) )->plain() .
2799                                         "\n</div>";
2800                 }
2801
2802                 return $text;
2803         }
2804
2805         /**
2806          * Show a warning about replica DB lag
2807          *
2808          * If the lag is higher than $wgSlaveLagCritical seconds,
2809          * then the warning is a bit more obvious. If the lag is
2810          * lower than $wgSlaveLagWarning, then no warning is shown.
2811          *
2812          * @param int $lag Replica lag
2813          */
2814         public function showLagWarning( $lag ) {
2815                 $config = $this->getConfig();
2816                 if ( $lag >= $config->get( 'SlaveLagWarning' ) ) {
2817                         $lag = floor( $lag ); // floor to avoid nano seconds to display
2818                         $message = $lag < $config->get( 'SlaveLagCritical' )
2819                                 ? 'lag-warn-normal'
2820                                 : 'lag-warn-high';
2821                         $wrap = Html::rawElement( 'div', [ 'class' => "mw-{$message}" ], "\n$1\n" );
2822                         $this->wrapWikiMsg( "$wrap\n", [ $message, $this->getLanguage()->formatNum( $lag ) ] );
2823                 }
2824         }
2825
2826         /**
2827          * Output an error page
2828          *
2829          * @note FatalError exception class provides an alternative.
2830          * @param string $message Error to output. Must be escaped for HTML.
2831          */
2832         public function showFatalError( $message ) {
2833                 $this->prepareErrorPage( $this->msg( 'internalerror' ) );
2834
2835                 $this->addHTML( $message );
2836         }
2837
2838         /**
2839          * Add a "return to" link pointing to a specified title
2840          *
2841          * @param Title $title Title to link
2842          * @param array $query Query string parameters
2843          * @param string|null $text Text of the link (input is not escaped)
2844          * @param array $options Options array to pass to Linker
2845          */
2846         public function addReturnTo( $title, array $query = [], $text = null, $options = [] ) {
2847                 $linkRenderer = MediaWikiServices::getInstance()
2848                         ->getLinkRendererFactory()->createFromLegacyOptions( $options );
2849                 $link = $this->msg( 'returnto' )->rawParams(
2850                         $linkRenderer->makeLink( $title, $text, [], $query ) )->escaped();
2851                 $this->addHTML( "<p id=\"mw-returnto\">{$link}</p>\n" );
2852         }
2853
2854         /**
2855          * Add a "return to" link pointing to a specified title,
2856          * or the title indicated in the request, or else the main page
2857          *
2858          * @param mixed|null $unused
2859          * @param Title|string|null $returnto Title or String to return to
2860          * @param string|null $returntoquery Query string for the return to link
2861          */
2862         public function returnToMain( $unused = null, $returnto = null, $returntoquery = null ) {
2863                 if ( $returnto == null ) {
2864                         $returnto = $this->getRequest()->getText( 'returnto' );
2865                 }
2866
2867                 if ( $returntoquery == null ) {
2868                         $returntoquery = $this->getRequest()->getText( 'returntoquery' );
2869                 }
2870
2871                 if ( $returnto === '' ) {
2872                         $returnto = Title::newMainPage();
2873                 }
2874
2875                 if ( is_object( $returnto ) ) {
2876                         $titleObj = $returnto;
2877                 } else {
2878                         $titleObj = Title::newFromText( $returnto );
2879                 }
2880                 // We don't want people to return to external interwiki. That
2881                 // might potentially be used as part of a phishing scheme
2882                 if ( !is_object( $titleObj ) || $titleObj->isExternal() ) {
2883                         $titleObj = Title::newMainPage();
2884                 }
2885
2886                 $this->addReturnTo( $titleObj, wfCgiToArray( $returntoquery ) );
2887         }
2888
2889         private function getRlClientContext() {
2890                 if ( !$this->rlClientContext ) {
2891                         $query = ResourceLoader::makeLoaderQuery(
2892                                 [], // modules; not relevant
2893                                 $this->getLanguage()->getCode(),
2894                                 $this->getSkin()->getSkinName(),
2895                                 $this->getUser()->isLoggedIn() ? $this->getUser()->getName() : null,
2896                                 null, // version; not relevant
2897                                 ResourceLoader::inDebugMode(),
2898                                 null, // only; not relevant
2899                                 $this->isPrintable(),
2900                                 $this->getRequest()->getBool( 'handheld' )
2901                         );
2902                         $this->rlClientContext = new ResourceLoaderContext(
2903                                 $this->getResourceLoader(),
2904                                 new FauxRequest( $query )
2905                         );
2906                         if ( $this->contentOverrideCallbacks ) {
2907                                 $this->rlClientContext = new DerivativeResourceLoaderContext( $this->rlClientContext );
2908                                 $this->rlClientContext->setContentOverrideCallback( function ( Title $title ) {
2909                                         foreach ( $this->contentOverrideCallbacks as $callback ) {
2910                                                 $content = $callback( $title );
2911                                                 if ( $content !== null ) {
2912                                                         $text = ContentHandler::getContentText( $content );
2913                                                         if ( strpos( $text, '</script>' ) !== false ) {
2914                                                                 // Proactively replace this so that we can display a message
2915                                                                 // to the user, instead of letting it go to Html::inlineScript(),
2916                                                                 // where it would be considered a server-side issue.
2917                                                                 $titleFormatted = $title->getPrefixedText();
2918                                                                 $content = new JavaScriptContent(
2919                                                                         Xml::encodeJsCall( 'mw.log.error', [
2920                                                                                 "Cannot preview $titleFormatted due to script-closing tag."
2921                                                                         ] )
2922                                                                 );
2923                                                         }
2924                                                         return $content;
2925                                                 }
2926                                         }
2927                                         return null;
2928                                 } );
2929                         }
2930                 }
2931                 return $this->rlClientContext;
2932         }
2933
2934         /**
2935          * Call this to freeze the module queue and JS config and create a formatter.
2936          *
2937          * Depending on the Skin, this may get lazy-initialised in either headElement() or
2938          * getBottomScripts(). See SkinTemplate::prepareQuickTemplate(). Calling this too early may
2939          * cause unexpected side-effects since disallowUserJs() may be called at any time to change
2940          * the module filters retroactively. Skins and extension hooks may also add modules until very
2941          * late in the request lifecycle.
2942          *
2943          * @return ResourceLoaderClientHtml
2944          */
2945         public function getRlClient() {
2946                 if ( !$this->rlClient ) {
2947                         $context = $this->getRlClientContext();
2948                         $rl = $this->getResourceLoader();
2949                         $this->addModules( [
2950                                 'user',
2951                                 'user.options',
2952                                 'user.tokens',
2953                         ] );
2954                         $this->addModuleStyles( [
2955                                 'site.styles',
2956                                 'noscript',
2957                                 'user.styles',
2958                         ] );
2959                         $this->getSkin()->setupSkinUserCss( $this );
2960
2961                         // Prepare exempt modules for buildExemptModules()
2962                         $exemptGroups = [ 'site' => [], 'noscript' => [], 'private' => [], 'user' => [] ];
2963                         $exemptStates = [];
2964                         $moduleStyles = $this->getModuleStyles( /*filter*/ true );
2965
2966                         // Preload getTitleInfo for isKnownEmpty calls below and in ResourceLoaderClientHtml
2967                         // Separate user-specific batch for improved cache-hit ratio.
2968                         $userBatch = [ 'user.styles', 'user' ];
2969                         $siteBatch = array_diff( $moduleStyles, $userBatch );
2970                         $dbr = wfGetDB( DB_REPLICA );
2971                         ResourceLoaderWikiModule::preloadTitleInfo( $context, $dbr, $siteBatch );
2972                         ResourceLoaderWikiModule::preloadTitleInfo( $context, $dbr, $userBatch );
2973
2974                         // Filter out modules handled by buildExemptModules()
2975                         $moduleStyles = array_filter( $moduleStyles,
2976                                 function ( $name ) use ( $rl, $context, &$exemptGroups, &$exemptStates ) {
2977                                         $module = $rl->getModule( $name );
2978                                         if ( $module ) {
2979                                                 $group = $module->getGroup();
2980                                                 if ( isset( $exemptGroups[$group] ) ) {
2981                                                         $exemptStates[$name] = 'ready';
2982                                                         if ( !$module->isKnownEmpty( $context ) ) {
2983                                                                 // E.g. Don't output empty <styles>
2984                                                                 $exemptGroups[$group][] = $name;
2985                                                         }
2986                                                         return false;
2987                                                 }
2988                                         }
2989                                         return true;
2990                                 }
2991                         );
2992                         $this->rlExemptStyleModules = $exemptGroups;
2993
2994                         $rlClient = new ResourceLoaderClientHtml( $context, [
2995                                 'target' => $this->getTarget(),
2996                                 'nonce' => $this->getCSPNonce(),
2997                                 // When 'safemode', disallowUserJs(), or reduceAllowedModules() is used
2998                                 // to only restrict modules to ORIGIN_CORE (ie. disallow ORIGIN_USER), the list of
2999                                 // modules enqueud for loading on this page is filtered to just those.
3000                                 // However, to make sure we also apply the restriction to dynamic dependencies and
3001                                 // lazy-loaded modules at run-time on the client-side, pass 'safemode' down to the
3002                                 // StartupModule so that the client-side registry will not contain any restricted
3003                                 // modules either. (T152169, T185303)
3004                                 'safemode' => ( $this->getAllowedModules( ResourceLoaderModule::TYPE_COMBINED )
3005                                         <= ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL
3006                                 ) ? '1' : null,
3007                         ] );
3008                         $rlClient->setConfig( $this->getJSVars() );
3009                         $rlClient->setModules( $this->getModules( /*filter*/ true ) );
3010                         $rlClient->setModuleStyles( $moduleStyles );
3011                         $rlClient->setExemptStates( $exemptStates );
3012                         $this->rlClient = $rlClient;
3013                 }
3014                 return $this->rlClient;
3015         }
3016
3017         /**
3018          * @param Skin $sk The given Skin
3019          * @param bool $includeStyle Unused
3020          * @return string The doctype, opening "<html>", and head element.
3021          */
3022         public function headElement( Skin $sk, $includeStyle = true ) {
3023                 $config = $this->getConfig();
3024                 $userdir = $this->getLanguage()->getDir();
3025                 $sitedir = MediaWikiServices::getInstance()->getContentLanguage()->getDir();
3026
3027                 $pieces = [];
3028                 $htmlAttribs = Sanitizer::mergeAttributes(
3029                         $this->getRlClient()->getDocumentAttributes(),
3030                         $sk->getHtmlElementAttributes()
3031                 );
3032                 $pieces[] = Html::htmlHeader( $htmlAttribs );
3033                 $pieces[] = Html::openElement( 'head' );
3034
3035                 if ( $this->getHTMLTitle() == '' ) {
3036                         $this->setHTMLTitle( $this->msg( 'pagetitle', $this->getPageTitle() )->inContentLanguage() );
3037                 }
3038
3039                 if ( !Html::isXmlMimeType( $config->get( 'MimeType' ) ) ) {
3040                         // Add <meta charset="UTF-8">
3041                         // This should be before <title> since it defines the charset used by
3042                         // text including the text inside <title>.
3043                         // The spec recommends defining XHTML5's charset using the XML declaration
3044                         // instead of meta.
3045                         // Our XML declaration is output by Html::htmlHeader.
3046                         // https://html.spec.whatwg.org/multipage/semantics.html#attr-meta-http-equiv-content-type
3047                         // https://html.spec.whatwg.org/multipage/semantics.html#charset
3048                         $pieces[] = Html::element( 'meta', [ 'charset' => 'UTF-8' ] );
3049                 }
3050
3051                 $pieces[] = Html::element( 'title', null, $this->getHTMLTitle() );
3052                 $pieces[] = $this->getRlClient()->getHeadHtml( $htmlAttribs['class'] ?? null );
3053                 $pieces[] = $this->buildExemptModules();
3054                 $pieces = array_merge( $pieces, array_values( $this->getHeadLinksArray() ) );
3055                 $pieces = array_merge( $pieces, array_values( $this->mHeadItems ) );
3056
3057                 // This library is intended to run on older browsers that MediaWiki no longer
3058                 // supports as Grade A. For these Grade C browsers, we provide an experience
3059                 // using only HTML and CSS. But, where standards-compliant browsers are able to
3060                 // style unknown HTML elements without issue, old IE ignores these styles.
3061                 // The html5shiv library fixes that.
3062                 // Use an IE conditional comment to serve the script only to old IE
3063                 $shivUrl = $config->get( 'ResourceBasePath' ) . '/resources/lib/html5shiv/html5shiv.js';
3064                 $pieces[] = '<!--[if lt IE 9]>' .
3065                         Html::linkedScript( $shivUrl, $this->getCSPNonce() ) .
3066                         '<![endif]-->';
3067
3068                 $pieces[] = Html::closeElement( 'head' );
3069
3070                 $bodyClasses = $this->mAdditionalBodyClasses;
3071                 $bodyClasses[] = 'mediawiki';
3072
3073                 # Classes for LTR/RTL directionality support
3074                 $bodyClasses[] = $userdir;
3075                 $bodyClasses[] = "sitedir-$sitedir";
3076
3077                 $underline = $this->getUser()->getOption( 'underline' );
3078                 if ( $underline < 2 ) {
3079                         // The following classes can be used here:
3080                         // * mw-underline-always
3081                         // * mw-underline-never
3082                         $bodyClasses[] = 'mw-underline-' . ( $underline ? 'always' : 'never' );
3083                 }
3084
3085                 if ( $this->getLanguage()->capitalizeAllNouns() ) {
3086                         # A <body> class is probably not the best way to do this . . .
3087                         $bodyClasses[] = 'capitalize-all-nouns';
3088                 }
3089
3090                 // Parser feature migration class
3091                 // The idea is that this will eventually be removed, after the wikitext
3092                 // which requires it is cleaned up.
3093                 $bodyClasses[] = 'mw-hide-empty-elt';
3094
3095                 $bodyClasses[] = $sk->getPageClasses( $this->getTitle() );
3096                 $bodyClasses[] = 'skin-' . Sanitizer::escapeClass( $sk->getSkinName() );
3097                 $bodyClasses[] =
3098                         'action-' . Sanitizer::escapeClass( Action::getActionName( $this->getContext() ) );
3099
3100                 $bodyAttrs = [];
3101                 // While the implode() is not strictly needed, it's used for backwards compatibility
3102                 // (this used to be built as a string and hooks likely still expect that).
3103                 $bodyAttrs['class'] = implode( ' ', $bodyClasses );
3104
3105                 // Allow skins and extensions to add body attributes they need
3106                 $sk->addToBodyAttributes( $this, $bodyAttrs );
3107                 Hooks::run( 'OutputPageBodyAttributes', [ $this, $sk, &$bodyAttrs ] );
3108
3109                 $pieces[] = Html::openElement( 'body', $bodyAttrs );
3110
3111                 return self::combineWrappedStrings( $pieces );
3112         }
3113
3114         /**
3115          * Get a ResourceLoader object associated with this OutputPage
3116          *
3117          * @return ResourceLoader
3118          */
3119         public function getResourceLoader() {
3120                 if ( is_null( $this->mResourceLoader ) ) {
3121                         // Lazy-initialise as needed
3122                         $this->mResourceLoader = MediaWikiServices::getInstance()->getResourceLoader();
3123                 }
3124                 return $this->mResourceLoader;
3125         }
3126
3127         /**
3128          * Explicily load or embed modules on a page.
3129          *
3130          * @param array|string $modules One or more module names
3131          * @param string $only ResourceLoaderModule TYPE_ class constant
3132          * @param array $extraQuery [optional] Array with extra query parameters for the request
3133          * @return string|WrappedStringList HTML
3134          */
3135         public function makeResourceLoaderLink( $modules, $only, array $extraQuery = [] ) {
3136                 // Apply 'target' and 'origin' filters
3137                 $modules = $this->filterModules( (array)$modules, null, $only );
3138
3139                 return ResourceLoaderClientHtml::makeLoad(
3140                         $this->getRlClientContext(),
3141                         $modules,
3142                         $only,
3143                         $extraQuery,
3144                         $this->getCSPNonce()
3145                 );
3146         }
3147
3148         /**
3149          * Combine WrappedString chunks and filter out empty ones
3150          *
3151          * @param array $chunks
3152          * @return string|WrappedStringList HTML
3153          */
3154         protected static function combineWrappedStrings( array $chunks ) {
3155                 // Filter out empty values
3156                 $chunks = array_filter( $chunks, 'strlen' );
3157                 return WrappedString::join( "\n", $chunks );
3158         }
3159
3160         /**
3161          * JS stuff to put at the bottom of the `<body>`.
3162          * These are legacy scripts ($this->mScripts), and user JS.
3163          *
3164          * @return string|WrappedStringList HTML
3165          */
3166         public function getBottomScripts() {
3167                 $chunks = [];
3168                 $chunks[] = $this->getRlClient()->getBodyHtml();
3169
3170                 // Legacy non-ResourceLoader scripts
3171                 $chunks[] = $this->mScripts;
3172
3173                 if ( $this->limitReportJSData ) {
3174                         $chunks[] = ResourceLoader::makeInlineScript(
3175                                 ResourceLoader::makeConfigSetScript(
3176                                         [ 'wgPageParseReport' => $this->limitReportJSData ]
3177                                 ),
3178                                 $this->getCSPNonce()
3179                         );
3180                 }
3181
3182                 return self::combineWrappedStrings( $chunks );
3183         }
3184
3185         /**
3186          * Get the javascript config vars to include on this page
3187          *
3188          * @return array Array of javascript config vars
3189          * @since 1.23
3190          */
3191         public function getJsConfigVars() {
3192                 return $this->mJsConfigVars;
3193         }
3194
3195         /**
3196          * Add one or more variables to be set in mw.config in JavaScript
3197          *
3198          * @param string|array $keys Key or array of key/value pairs
3199          * @param mixed|null $value [optional] Value of the configuration variable
3200          */
3201         public function addJsConfigVars( $keys, $value = null ) {
3202                 if ( is_array( $keys ) ) {
3203                         foreach ( $keys as $key => $value ) {
3204                                 $this->mJsConfigVars[$key] = $value;
3205                         }
3206                         return;
3207                 }
3208
3209                 $this->mJsConfigVars[$keys] = $value;
3210         }
3211
3212         /**
3213          * Get an array containing the variables to be set in mw.config in JavaScript.
3214          *
3215          * Do not add things here which can be evaluated in ResourceLoaderStartUpModule
3216          * - in other words, page-independent/site-wide variables (without state).
3217          * You will only be adding bloat to the html page and causing page caches to
3218          * have to be purged on configuration changes.
3219          * @return array
3220          */
3221         public function getJSVars() {
3222                 $curRevisionId = 0;
3223                 $articleId = 0;
3224                 $canonicalSpecialPageName = false; # T23115
3225                 $services = MediaWikiServices::getInstance();
3226
3227                 $title = $this->getTitle();
3228                 $ns = $title->getNamespace();
3229                 $nsInfo = $services->getNamespaceInfo();
3230                 $canonicalNamespace = $nsInfo->exists( $ns )
3231                         ? $nsInfo->getCanonicalName( $ns )
3232                         : $title->getNsText();
3233
3234                 $sk = $this->getSkin();
3235                 // Get the relevant title so that AJAX features can use the correct page name
3236                 // when making API requests from certain special pages (T36972).
3237                 $relevantTitle = $sk->getRelevantTitle();
3238                 $relevantUser = $sk->getRelevantUser();
3239
3240                 if ( $ns == NS_SPECIAL ) {
3241                         list( $canonicalSpecialPageName, /*...*/ ) =
3242                                 $services->getSpecialPageFactory()->
3243                                         resolveAlias( $title->getDBkey() );
3244                 } elseif ( $this->canUseWikiPage() ) {
3245                         $wikiPage = $this->getWikiPage();
3246                         $curRevisionId = $wikiPage->getLatest();
3247                         $articleId = $wikiPage->getId();
3248                 }
3249
3250                 $lang = $title->getPageViewLanguage();
3251
3252                 // Pre-process information
3253                 $separatorTransTable = $lang->separatorTransformTable();
3254                 $separatorTransTable = $separatorTransTable ?: [];
3255                 $compactSeparatorTransTable = [
3256                         implode( "\t", array_keys( $separatorTransTable ) ),
3257                         implode( "\t", $separatorTransTable ),
3258                 ];
3259                 $digitTransTable = $lang->digitTransformTable();
3260                 $digitTransTable = $digitTransTable ?: [];
3261                 $compactDigitTransTable = [
3262                         implode( "\t", array_keys( $digitTransTable ) ),
3263                         implode( "\t", $digitTransTable ),
3264                 ];
3265
3266                 $user = $this->getUser();
3267
3268                 $vars = [
3269                         'wgCanonicalNamespace' => $canonicalNamespace,
3270                         'wgCanonicalSpecialPageName' => $canonicalSpecialPageName,
3271                         'wgNamespaceNumber' => $title->getNamespace(),
3272                         'wgPageName' => $title->getPrefixedDBkey(),
3273                         'wgTitle' => $title->getText(),
3274                         'wgCurRevisionId' => $curRevisionId,
3275                         'wgRevisionId' => (int)$this->getRevisionId(),
3276                         'wgArticleId' => $articleId,
3277                         'wgIsArticle' => $this->isArticle(),
3278                         'wgIsRedirect' => $title->isRedirect(),
3279                         'wgAction' => Action::getActionName( $this->getContext() ),
3280                         'wgUserName' => $user->isAnon() ? null : $user->getName(),
3281                         'wgUserGroups' => $user->getEffectiveGroups(),
3282                         'wgCategories' => $this->getCategories(),
3283                         'wgBreakFrames' => $this->getFrameOptions() == 'DENY',
3284                         'wgPageContentLanguage' => $lang->getCode(),
3285                         'wgPageContentModel' => $title->getContentModel(),
3286                         'wgSeparatorTransformTable' => $compactSeparatorTransTable,
3287                         'wgDigitTransformTable' => $compactDigitTransTable,
3288                         'wgDefaultDateFormat' => $lang->getDefaultDateFormat(),
3289                         'wgMonthNames' => $lang->getMonthNamesArray(),
3290                         'wgMonthNamesShort' => $lang->getMonthAbbreviationsArray(),
3291                         'wgRelevantPageName' => $relevantTitle->getPrefixedDBkey(),
3292                         'wgRelevantArticleId' => $relevantTitle->getArticleID(),
3293                         'wgRequestId' => WebRequest::getRequestId(),
3294                         'wgCSPNonce' => $this->getCSPNonce(),
3295                 ];
3296
3297                 if ( $user->isLoggedIn() ) {
3298                         $vars['wgUserId'] = $user->getId();
3299                         $vars['wgUserEditCount'] = $user->getEditCount();
3300                         $userReg = $user->getRegistration();
3301                         $vars['wgUserRegistration'] = $userReg ? wfTimestamp( TS_UNIX, $userReg ) * 1000 : null;
3302                         // Get the revision ID of the oldest new message on the user's talk
3303                         // page. This can be used for constructing new message alerts on
3304                         // the client side.
3305                         $vars['wgUserNewMsgRevisionId'] = $user->getNewMessageRevisionId();
3306                 }
3307
3308                 $contLang = $services->getContentLanguage();
3309                 if ( $contLang->hasVariants() ) {
3310                         $vars['wgUserVariant'] = $contLang->getPreferredVariant();
3311                 }
3312                 // Same test as SkinTemplate
3313                 $vars['wgIsProbablyEditable'] = $this->userCanEditOrCreate( $user, $title );
3314
3315                 $vars['wgRelevantPageIsProbablyEditable'] = $relevantTitle &&
3316                         $this->userCanEditOrCreate( $user, $relevantTitle );
3317
3318                 foreach ( $title->getRestrictionTypes() as $type ) {
3319                         // Following keys are set in $vars:
3320                         // wgRestrictionCreate, wgRestrictionEdit, wgRestrictionMove, wgRestrictionUpload
3321                         $vars['wgRestriction' . ucfirst( $type )] = $title->getRestrictions( $type );
3322                 }
3323
3324                 if ( $title->isMainPage() ) {
3325                         $vars['wgIsMainPage'] = true;
3326                 }
3327
3328                 if ( $this->mRedirectedFrom ) {
3329                         $vars['wgRedirectedFrom'] = $this->mRedirectedFrom->getPrefixedDBkey();
3330                 }
3331
3332                 if ( $relevantUser ) {
3333                         $vars['wgRelevantUserName'] = $relevantUser->getName();
3334                 }
3335
3336                 // Allow extensions to add their custom variables to the mw.config map.
3337                 // Use the 'ResourceLoaderGetConfigVars' hook if the variable is not
3338                 // page-dependant but site-wide (without state).
3339                 // Alternatively, you may want to use OutputPage->addJsConfigVars() instead.
3340                 Hooks::run( 'MakeGlobalVariablesScript', [ &$vars, $this ] );
3341
3342                 // Merge in variables from addJsConfigVars last
3343                 return array_merge( $vars, $this->getJsConfigVars() );
3344         }
3345
3346         /**
3347          * To make it harder for someone to slip a user a fake
3348          * JavaScript or CSS preview, a random token
3349          * is associated with the login session. If it's not
3350          * passed back with the preview request, we won't render
3351          * the code.
3352          *
3353          * @return bool
3354          */
3355         public function userCanPreview() {
3356                 $request = $this->getRequest();
3357                 if (
3358                         $request->getVal( 'action' ) !== 'submit' ||
3359                         !$request->wasPosted()
3360                 ) {
3361                         return false;
3362                 }
3363
3364                 $user = $this->getUser();
3365
3366                 if ( !$user->isLoggedIn() ) {
3367                         // Anons have predictable edit tokens
3368                         return false;
3369                 }
3370                 if ( !$user->matchEditToken( $request->getVal( 'wpEditToken' ) ) ) {
3371                         return false;
3372                 }
3373
3374                 $title = $this->getTitle();
3375                 $errors = $title->getUserPermissionsErrors( 'edit', $user );
3376                 if ( count( $errors ) !== 0 ) {
3377                         return false;
3378                 }
3379
3380                 return true;
3381         }
3382
3383         /**
3384          * @param User $user
3385          * @param LinkTarget $title
3386          * @return bool
3387          */
3388         private function userCanEditOrCreate(
3389                 User $user,
3390                 LinkTarget $title
3391         ) {
3392                 $pm = MediaWikiServices::getInstance()->getPermissionManager();
3393                 return $pm->quickUserCan( 'edit', $user, $title )
3394                 && ( $this->getTitle()->exists() ||
3395                          $pm->quickUserCan( 'create', $user, $title ) );
3396         }
3397
3398         /**
3399          * @return array Array in format "link name or number => 'link html'".
3400          */
3401         public function getHeadLinksArray() {
3402                 global $wgVersion;
3403
3404                 $tags = [];
3405                 $config = $this->getConfig();
3406
3407                 $canonicalUrl = $this->mCanonicalUrl;
3408
3409                 $tags['meta-generator'] = Html::element( 'meta', [
3410                         'name' => 'generator',
3411                         'content' => "MediaWiki $wgVersion",
3412                 ] );
3413
3414                 if ( $config->get( 'ReferrerPolicy' ) !== false ) {
3415                         // Per https://w3c.github.io/webappsec-referrer-policy/#unknown-policy-values
3416                         // fallbacks should come before the primary value so we need to reverse the array.
3417                         foreach ( array_reverse( (array)$config->get( 'ReferrerPolicy' ) ) as $i => $policy ) {
3418                                 $tags["meta-referrer-$i"] = Html::element( 'meta', [
3419                                         'name' => 'referrer',
3420                                         'content' => $policy,
3421                                 ] );
3422                         }
3423                 }
3424
3425                 $p = "{$this->mIndexPolicy},{$this->mFollowPolicy}";
3426                 if ( $p !== 'index,follow' ) {
3427                         // http://www.robotstxt.org/wc/meta-user.html
3428                         // Only show if it's different from the default robots policy
3429                         $tags['meta-robots'] = Html::element( 'meta', [
3430                                 'name' => 'robots',
3431                                 'content' => $p,
3432                         ] );
3433                 }
3434
3435                 foreach ( $this->mMetatags as $tag ) {
3436                         if ( strncasecmp( $tag[0], 'http:', 5 ) === 0 ) {
3437                                 $a = 'http-equiv';
3438                                 $tag[0] = substr( $tag[0], 5 );
3439                         } elseif ( strncasecmp( $tag[0], 'og:', 3 ) === 0 ) {
3440                                 $a = 'property';
3441                         } else {
3442                                 $a = 'name';
3443                         }
3444                         $tagName = "meta-{$tag[0]}";
3445                         if ( isset( $tags[$tagName] ) ) {
3446                                 $tagName .= $tag[1];
3447                         }
3448                         $tags[$tagName] = Html::element( 'meta',
3449                                 [
3450                                         $a => $tag[0],
3451                                         'content' => $tag[1]
3452                                 ]
3453                         );
3454                 }
3455
3456                 foreach ( $this->mLinktags as $tag ) {
3457                         $tags[] = Html::element( 'link', $tag );
3458                 }
3459
3460                 # Universal edit button
3461                 if ( $config->get( 'UniversalEditButton' ) && $this->isArticleRelated() ) {
3462                         if ( $this->userCanEditOrCreate( $this->getUser(), $this->getTitle() ) ) {
3463                                 // Original UniversalEditButton
3464                                 $msg = $this->msg( 'edit' )->text();
3465                                 $tags['universal-edit-button'] = Html::element( 'link', [
3466                                         'rel' => 'alternate',
3467                                         'type' => 'application/x-wiki',
3468                                         'title' => $msg,
3469                                         'href' => $this->getTitle()->getEditURL(),
3470                                 ] );
3471                                 // Alternate edit link
3472                                 $tags['alternative-edit'] = Html::element( 'link', [
3473                                         'rel' => 'edit',
3474                                         'title' => $msg,
3475                                         'href' => $this->getTitle()->getEditURL(),
3476                                 ] );
3477                         }
3478                 }
3479
3480                 # Generally the order of the favicon and apple-touch-icon links
3481                 # should not matter, but Konqueror (3.5.9 at least) incorrectly
3482                 # uses whichever one appears later in the HTML source. Make sure
3483                 # apple-touch-icon is specified first to avoid this.
3484                 if ( $config->get( 'AppleTouchIcon' ) !== false ) {
3485                         $tags['apple-touch-icon'] = Html::element( 'link', [
3486                                 'rel' => 'apple-touch-icon',
3487                                 'href' => $config->get( 'AppleTouchIcon' )
3488                         ] );
3489                 }
3490
3491                 if ( $config->get( 'Favicon' ) !== false ) {
3492                         $tags['favicon'] = Html::element( 'link', [
3493                                 'rel' => 'shortcut icon',
3494                                 'href' => $config->get( 'Favicon' )
3495                         ] );
3496                 }
3497
3498                 # OpenSearch description link
3499                 $tags['opensearch'] = Html::element( 'link', [
3500                         'rel' => 'search',
3501                         'type' => 'application/opensearchdescription+xml',
3502                         'href' => wfScript( 'opensearch_desc' ),
3503                         'title' => $this->msg( 'opensearch-desc' )->inContentLanguage()->text(),
3504                 ] );
3505
3506                 # Real Simple Discovery link, provides auto-discovery information
3507                 # for the MediaWiki API (and potentially additional custom API
3508                 # support such as WordPress or Twitter-compatible APIs for a
3509                 # blogging extension, etc)
3510                 $tags['rsd'] = Html::element( 'link', [
3511                         'rel' => 'EditURI',
3512                         'type' => 'application/rsd+xml',
3513                         // Output a protocol-relative URL here if $wgServer is protocol-relative.
3514                         // Whether RSD accepts relative or protocol-relative URLs is completely
3515                         // undocumented, though.
3516                         'href' => wfExpandUrl( wfAppendQuery(
3517                                 wfScript( 'api' ),
3518                                 [ 'action' => 'rsd' ] ),
3519                                 PROTO_RELATIVE
3520                         ),
3521                 ] );
3522
3523                 # Language variants
3524                 if ( !$config->get( 'DisableLangConversion' ) ) {
3525                         $lang = $this->getTitle()->getPageLanguage();
3526                         if ( $lang->hasVariants() ) {
3527                                 $variants = $lang->getVariants();
3528                                 foreach ( $variants as $variant ) {
3529                                         $tags["variant-$variant"] = Html::element( 'link', [
3530                                                 'rel' => 'alternate',
3531                                                 'hreflang' => LanguageCode::bcp47( $variant ),
3532                                                 'href' => $this->getTitle()->getLocalURL(
3533                                                         [ 'variant' => $variant ] )
3534                                                 ]
3535                                         );
3536                                 }
3537                                 # x-default link per https://support.google.com/webmasters/answer/189077?hl=en
3538                                 $tags["variant-x-default"] = Html::element( 'link', [
3539                                         'rel' => 'alternate',
3540                                         'hreflang' => 'x-default',
3541                                         'href' => $this->getTitle()->getLocalURL() ] );
3542                         }
3543                 }
3544
3545                 # Copyright
3546                 if ( $this->copyrightUrl !== null ) {
3547                         $copyright = $this->copyrightUrl;
3548                 } else {
3549                         $copyright = '';
3550                         if ( $config->get( 'RightsPage' ) ) {
3551                                 $copy = Title::newFromText( $config->get( 'RightsPage' ) );
3552
3553                                 if ( $copy ) {
3554                                         $copyright = $copy->getLocalURL();
3555                                 }
3556                         }
3557
3558                         if ( !$copyright && $config->get( 'RightsUrl' ) ) {
3559                                 $copyright = $config->get( 'RightsUrl' );
3560                         }
3561                 }
3562
3563                 if ( $copyright ) {
3564                         $tags['copyright'] = Html::element( 'link', [
3565                                 'rel' => 'license',
3566                                 'href' => $copyright ]
3567                         );
3568                 }
3569
3570                 # Feeds
3571                 if ( $config->get( 'Feed' ) ) {
3572                         $feedLinks = [];
3573
3574                         foreach ( $this->getSyndicationLinks() as $format => $link ) {
3575                                 # Use the page name for the title.  In principle, this could
3576                                 # lead to issues with having the same name for different feeds
3577                                 # corresponding to the same page, but we can't avoid that at
3578                                 # this low a level.
3579
3580                                 $feedLinks[] = $this->feedLink(
3581                                         $format,
3582                                         $link,
3583                                         # Used messages: 'page-rss-feed' and 'page-atom-feed' (for an easier grep)
3584                                         $this->msg(
3585                                                 "page-{$format}-feed", $this->getTitle()->getPrefixedText()
3586                                         )->text()
3587                                 );
3588                         }
3589
3590                         # Recent changes feed should appear on every page (except recentchanges,
3591                         # that would be redundant). Put it after the per-page feed to avoid
3592                         # changing existing behavior. It's still available, probably via a
3593                         # menu in your browser. Some sites might have a different feed they'd
3594                         # like to promote instead of the RC feed (maybe like a "Recent New Articles"
3595                         # or "Breaking news" one). For this, we see if $wgOverrideSiteFeed is defined.
3596                         # If so, use it instead.
3597                         $sitename = $config->get( 'Sitename' );
3598                         $overrideSiteFeed = $config->get( 'OverrideSiteFeed' );
3599                         if ( $overrideSiteFeed ) {
3600                                 foreach ( $overrideSiteFeed as $type => $feedUrl ) {
3601                                         // Note, this->feedLink escapes the url.
3602                                         $feedLinks[] = $this->feedLink(
3603                                                 $type,
3604                                                 $feedUrl,
3605                                                 $this->msg( "site-{$type}-feed", $sitename )->text()
3606                                         );
3607                                 }
3608                         } elseif ( !$this->getTitle()->isSpecial( 'Recentchanges' ) ) {
3609                                 $rctitle = SpecialPage::getTitleFor( 'Recentchanges' );
3610                                 foreach ( $this->getAdvertisedFeedTypes() as $format ) {
3611                                         $feedLinks[] = $this->feedLink(
3612                                                 $format,
3613                                                 $rctitle->getLocalURL( [ 'feed' => $format ] ),
3614                                                 # For grep: 'site-rss-feed', 'site-atom-feed'
3615                                                 $this->msg( "site-{$format}-feed", $sitename )->text()
3616                                         );
3617                                 }
3618                         }
3619
3620                         # Allow extensions to change the list pf feeds. This hook is primarily for changing,
3621                         # manipulating or removing existing feed tags. If you want to add new feeds, you should
3622                         # use OutputPage::addFeedLink() instead.
3623                         Hooks::run( 'AfterBuildFeedLinks', [ &$feedLinks ] );
3624
3625                         $tags += $feedLinks;
3626                 }
3627
3628                 # Canonical URL
3629                 if ( $config->get( 'EnableCanonicalServerLink' ) ) {
3630                         if ( $canonicalUrl !== false ) {
3631                                 $canonicalUrl = wfExpandUrl( $canonicalUrl, PROTO_CANONICAL );
3632                         } elseif ( $this->isArticleRelated() ) {
3633                                 // This affects all requests where "setArticleRelated" is true. This is
3634                                 // typically all requests that show content (query title, curid, oldid, diff),
3635                                 // and all wikipage actions (edit, delete, purge, info, history etc.).
3636                                 // It does not apply to File pages and Special pages.
3637                                 // 'history' and 'info' actions address page metadata rather than the page
3638                                 // content itself, so they may not be canonicalized to the view page url.
3639                                 // TODO: this ought to be better encapsulated in the Action class.
3640                                 $action = Action::getActionName( $this->getContext() );
3641                                 if ( in_array( $action, [ 'history', 'info' ] ) ) {
3642                                         $query = "action={$action}";
3643                                 } else {
3644                                         $query = '';
3645                                 }
3646                                 $canonicalUrl = $this->getTitle()->getCanonicalURL( $query );
3647                         } else {
3648                                 $reqUrl = $this->getRequest()->getRequestURL();
3649                                 $canonicalUrl = wfExpandUrl( $reqUrl, PROTO_CANONICAL );
3650                         }
3651                 }
3652                 if ( $canonicalUrl !== false ) {
3653                         $tags[] = Html::element( 'link', [
3654                                 'rel' => 'canonical',
3655                                 'href' => $canonicalUrl
3656                         ] );
3657                 }
3658
3659                 // Allow extensions to add, remove and/or otherwise manipulate these links
3660                 // If you want only to *add* <head> links, please use the addHeadItem()
3661                 // (or addHeadItems() for multiple items) method instead.
3662                 // This hook is provided as a last resort for extensions to modify these
3663                 // links before the output is sent to client.
3664                 Hooks::run( 'OutputPageAfterGetHeadLinksArray', [ &$tags, $this ] );
3665
3666                 return $tags;
3667         }
3668
3669         /**
3670          * Generate a "<link rel/>" for a feed.
3671          *
3672          * @param string $type Feed type
3673          * @param string $url URL to the feed
3674          * @param string $text Value of the "title" attribute
3675          * @return string HTML fragment
3676          */
3677         private function feedLink( $type, $url, $text ) {
3678                 return Html::element( 'link', [
3679                         'rel' => 'alternate',
3680                         'type' => "application/$type+xml",
3681                         'title' => $text,
3682                         'href' => $url ]
3683                 );
3684         }
3685
3686         /**
3687          * Add a local or specified stylesheet, with the given media options.
3688          * Internal use only. Use OutputPage::addModuleStyles() if possible.
3689          *
3690          * @param string $style URL to the file
3691          * @param string $media To specify a media type, 'screen', 'printable', 'handheld' or any.
3692          * @param string $condition For IE conditional comments, specifying an IE version
3693          * @param string $dir Set to 'rtl' or 'ltr' for direction-specific sheets
3694          */
3695         public function addStyle( $style, $media = '', $condition = '', $dir = '' ) {
3696                 $options = [];
3697                 if ( $media ) {
3698                         $options['media'] = $media;
3699                 }
3700                 if ( $condition ) {
3701                         $options['condition'] = $condition;
3702                 }
3703                 if ( $dir ) {
3704                         $options['dir'] = $dir;
3705                 }
3706                 $this->styles[$style] = $options;
3707         }
3708
3709         /**
3710          * Adds inline CSS styles
3711          * Internal use only. Use OutputPage::addModuleStyles() if possible.
3712          *
3713          * @param mixed $style_css Inline CSS
3714          * @param string $flip Set to 'flip' to flip the CSS if needed
3715          */
3716         public function addInlineStyle( $style_css, $flip = 'noflip' ) {
3717                 if ( $flip === 'flip' && $this->getLanguage()->isRTL() ) {
3718                         # If wanted, and the interface is right-to-left, flip the CSS
3719                         $style_css = CSSJanus::transform( $style_css, true, false );
3720                 }
3721                 $this->mInlineStyles .= Html::inlineStyle( $style_css );
3722         }
3723
3724         /**
3725          * Build exempt modules and legacy non-ResourceLoader styles.
3726          *
3727          * @return string|WrappedStringList HTML
3728          */
3729         protected function buildExemptModules() {
3730                 $chunks = [];
3731
3732                 // Requirements:
3733                 // - Within modules provided by the software (core, skin, extensions),
3734                 //   styles from skin stylesheets should be overridden by styles
3735                 //   from modules dynamically loaded with JavaScript.
3736                 // - Styles from site-specific, private, and user modules should override
3737                 //   both of the above.
3738                 //
3739                 // The effective order for stylesheets must thus be:
3740                 // 1. Page style modules, formatted server-side by ResourceLoaderClientHtml.
3741                 // 2. Dynamically-loaded styles, inserted client-side by mw.loader.
3742                 // 3. Styles that are site-specific, private or from the user, formatted
3743                 //    server-side by this function.
3744                 //
3745                 // The 'ResourceLoaderDynamicStyles' marker helps JavaScript know where
3746                 // point #2 is.
3747
3748                 // Add legacy styles added through addStyle()/addInlineStyle() here
3749                 $chunks[] = implode( '', $this->buildCssLinksArray() ) . $this->mInlineStyles;
3750
3751                 // Things that go after the ResourceLoaderDynamicStyles marker
3752                 $append = [];
3753                 $separateReq = [ 'site.styles', 'user.styles' ];
3754                 foreach ( $this->rlExemptStyleModules as $group => $moduleNames ) {
3755                         if ( $moduleNames ) {
3756                                 $append[] = $this->makeResourceLoaderLink(
3757                                         array_diff( $moduleNames, $separateReq ),
3758                                         ResourceLoaderModule::TYPE_STYLES
3759                                 );
3760
3761                                 foreach ( array_intersect( $moduleNames, $separateReq ) as $name ) {
3762                                         // These require their own dedicated request in order to support "@import"
3763                                         // syntax, which is incompatible with concatenation. (T147667, T37562)
3764                                         $append[] = $this->makeResourceLoaderLink( $name,
3765                                                 ResourceLoaderModule::TYPE_STYLES
3766                                         );
3767                                 }
3768                         }
3769                 }
3770                 if ( $append ) {
3771                         $chunks[] = Html::element(
3772                                 'meta',
3773                                 [ 'name' => 'ResourceLoaderDynamicStyles', 'content' => '' ]
3774                         );
3775                         $chunks = array_merge( $chunks, $append );
3776                 }
3777
3778                 return self::combineWrappedStrings( $chunks );
3779         }
3780
3781         /**
3782          * @return array
3783          */
3784         public function buildCssLinksArray() {
3785                 $links = [];
3786
3787                 foreach ( $this->styles as $file => $options ) {
3788                         $link = $this->styleLink( $file, $options );
3789                         if ( $link ) {
3790                                 $links[$file] = $link;
3791                         }
3792                 }
3793                 return $links;
3794         }
3795
3796         /**
3797          * Generate \<link\> tags for stylesheets
3798          *
3799          * @param string $style URL to the file
3800          * @param array $options Option, can contain 'condition', 'dir', 'media' keys
3801          * @return string HTML fragment
3802          */
3803         protected function styleLink( $style, array $options ) {
3804                 if ( isset( $options['dir'] ) && $this->getLanguage()->getDir() != $options['dir'] ) {
3805                         return '';
3806                 }
3807
3808                 if ( isset( $options['media'] ) ) {
3809                         $media = self::transformCssMedia( $options['media'] );
3810                         if ( is_null( $media ) ) {
3811                                 return '';
3812                         }
3813                 } else {
3814                         $media = 'all';
3815                 }
3816
3817                 if ( substr( $style, 0, 1 ) == '/' ||
3818                         substr( $style, 0, 5 ) == 'http:' ||
3819                         substr( $style, 0, 6 ) == 'https:' ) {
3820                         $url = $style;
3821                 } else {
3822                         $config = $this->getConfig();
3823                         // Append file hash as query parameter
3824                         $url = self::transformResourcePath(
3825                                 $config,
3826                                 $config->get( 'StylePath' ) . '/' . $style
3827                         );
3828                 }
3829
3830                 $link = Html::linkedStyle( $url, $media );
3831
3832                 if ( isset( $options['condition'] ) ) {
3833                         $condition = htmlspecialchars( $options['condition'] );
3834                         $link = "<!--[if $condition]>$link<![endif]-->";
3835                 }
3836                 return $link;
3837         }
3838
3839         /**
3840          * Transform path to web-accessible static resource.
3841          *
3842          * This is used to add a validation hash as query string.
3843          * This aids various behaviors:
3844          *
3845          * - Put long Cache-Control max-age headers on responses for improved
3846          *   cache performance.
3847          * - Get the correct version of a file as expected by the current page.
3848          * - Instantly get the updated version of a file after deployment.
3849          *
3850          * Avoid using this for urls included in HTML as otherwise clients may get different
3851          * versions of a resource when navigating the site depending on when the page was cached.
3852          * If changes to the url propagate, this is not a problem (e.g. if the url is in
3853          * an external stylesheet).
3854          *
3855          * @since 1.27
3856          * @param Config $config
3857          * @param string $path Path-absolute URL to file (from document root, must start with "/")
3858          * @return string URL
3859          */
3860         public static function transformResourcePath( Config $config, $path ) {
3861                 global $IP;
3862
3863                 $localDir = $IP;
3864                 $remotePathPrefix = $config->get( 'ResourceBasePath' );
3865                 if ( $remotePathPrefix === '' ) {
3866                         // The configured base path is required to be empty string for
3867                         // wikis in the domain root
3868                         $remotePath = '/';
3869                 } else {
3870                         $remotePath = $remotePathPrefix;
3871                 }
3872                 if ( strpos( $path, $remotePath ) !== 0 || substr( $path, 0, 2 ) === '//' ) {
3873                         // - Path is outside wgResourceBasePath, ignore.
3874                         // - Path is protocol-relative. Fixes T155310. Not supported by RelPath lib.
3875                         return $path;
3876                 }
3877                 // For files in resources, extensions/ or skins/, ResourceBasePath is preferred here.
3878                 // For other misc files in $IP, we'll fallback to that as well. There is, however, a fourth
3879                 // supported dir/path pair in the configuration (wgUploadDirectory, wgUploadPath)
3880                 // which is not expected to be in wgResourceBasePath on CDNs. (T155146)
3881                 $uploadPath = $config->get( 'UploadPath' );
3882                 if ( strpos( $path, $uploadPath ) === 0 ) {
3883                         $localDir = $config->get( 'UploadDirectory' );
3884                         $remotePathPrefix = $remotePath = $uploadPath;
3885                 }
3886
3887                 $path = RelPath::getRelativePath( $path, $remotePath );
3888                 return self::transformFilePath( $remotePathPrefix, $localDir, $path );
3889         }
3890
3891         /**
3892          * Utility method for transformResourceFilePath().
3893          *
3894          * Caller is responsible for ensuring the file exists. Emits a PHP warning otherwise.
3895          *
3896          * @since 1.27
3897          * @param string $remotePathPrefix URL path prefix that points to $localPath
3898          * @param string $localPath File directory exposed at $remotePath
3899          * @param string $file Path to target file relative to $localPath
3900          * @return string URL
3901          */
3902         public static function transformFilePath( $remotePathPrefix, $localPath, $file ) {
3903                 $hash = md5_file( "$localPath/$file" );
3904                 if ( $hash === false ) {
3905                         wfLogWarning( __METHOD__ . ": Failed to hash $localPath/$file" );
3906                         $hash = '';
3907                 }
3908                 return "$remotePathPrefix/$file?" . substr( $hash, 0, 5 );
3909         }
3910
3911         /**
3912          * Transform "media" attribute based on request parameters
3913          *
3914          * @param string $media Current value of the "media" attribute
3915          * @return string Modified value of the "media" attribute, or null to skip
3916          * this stylesheet
3917          */
3918         public static function transformCssMedia( $media ) {
3919                 global $wgRequest;
3920
3921                 // https://www.w3.org/TR/css3-mediaqueries/#syntax
3922                 $screenMediaQueryRegex = '/^(?:only\s+)?screen\b/i';
3923
3924                 // Switch in on-screen display for media testing
3925                 $switches = [
3926                         'printable' => 'print',
3927                         'handheld' => 'handheld',
3928                 ];
3929                 foreach ( $switches as $switch => $targetMedia ) {
3930                         if ( $wgRequest->getBool( $switch ) ) {
3931                                 if ( $media == $targetMedia ) {
3932                                         $media = '';
3933                                 } elseif ( preg_match( $screenMediaQueryRegex, $media ) === 1 ) {
3934                                         /* This regex will not attempt to understand a comma-separated media_query_list
3935                                          *
3936                                          * Example supported values for $media:
3937                                          * 'screen', 'only screen', 'screen and (min-width: 982px)' ),
3938                                          * Example NOT supported value for $media:
3939                                          * '3d-glasses, screen, print and resolution > 90dpi'
3940                                          *
3941                                          * If it's a print request, we never want any kind of screen stylesheets
3942                                          * If it's a handheld request (currently the only other choice with a switch),
3943                                          * we don't want simple 'screen' but we might want screen queries that
3944                                          * have a max-width or something, so we'll pass all others on and let the
3945                                          * client do the query.
3946                                          */
3947                                         if ( $targetMedia == 'print' || $media == 'screen' ) {
3948                                                 return null;
3949                                         }
3950                                 }
3951                         }
3952                 }
3953
3954                 return $media;
3955         }
3956
3957         /**
3958          * Add a wikitext-formatted message to the output.
3959          * This is equivalent to:
3960          *
3961          *    $wgOut->addWikiText( wfMessage( ... )->plain() )
3962          */
3963         public function addWikiMsg( /*...*/ ) {
3964                 $args = func_get_args();
3965                 $name = array_shift( $args );
3966                 $this->addWikiMsgArray( $name, $args );
3967         }
3968
3969         /**
3970          * Add a wikitext-formatted message to the output.
3971          * Like addWikiMsg() except the parameters are taken as an array
3972          * instead of a variable argument list.
3973          *
3974          * @param string $name
3975          * @param array $args
3976          */
3977         public function addWikiMsgArray( $name, $args ) {
3978                 $this->addHTML( $this->msg( $name, $args )->parseAsBlock() );
3979         }
3980
3981         /**
3982          * This function takes a number of message/argument specifications, wraps them in
3983          * some overall structure, and then parses the result and adds it to the output.
3984          *
3985          * In the $wrap, $1 is replaced with the first message, $2 with the second,
3986          * and so on. The subsequent arguments may be either
3987          * 1) strings, in which case they are message names, or
3988          * 2) arrays, in which case, within each array, the first element is the message
3989          *    name, and subsequent elements are the parameters to that message.
3990          *
3991          * Don't use this for messages that are not in the user's interface language.
3992          *
3993          * For example:
3994          *
3995          *     $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>", 'some-error' );
3996          *
3997          * Is equivalent to:
3998          *
3999          *     $wgOut->addWikiTextAsInterface( "<div class='error'>\n"
4000          *         . wfMessage( 'some-error' )->plain() . "\n</div>" );
4001          *
4002          * The newline after the opening div is needed in some wikitext. See T21226.
4003          *
4004          * @param string $wrap
4005          */
4006         public function wrapWikiMsg( $wrap /*, ...*/ ) {
4007                 $msgSpecs = func_get_args();
4008                 array_shift( $msgSpecs );
4009                 $msgSpecs = array_values( $msgSpecs );
4010                 $s = $wrap;
4011                 foreach ( $msgSpecs as $n => $spec ) {
4012                         if ( is_array( $spec ) ) {
4013                                 $args = $spec;
4014                                 $name = array_shift( $args );
4015                         } else {
4016                                 $args = [];
4017                                 $name = $spec;
4018                         }
4019                         $s = str_replace( '$' . ( $n + 1 ), $this->msg( $name, $args )->plain(), $s );
4020                 }
4021                 $this->addWikiTextAsInterface( $s );
4022         }
4023
4024         /**
4025          * Whether the output has a table of contents
4026          * @return bool
4027          * @since 1.22
4028          */
4029         public function isTOCEnabled() {
4030                 return $this->mEnableTOC;
4031         }
4032
4033         /**
4034          * Helper function to setup the PHP implementation of OOUI to use in this request.
4035          *
4036          * @since 1.26
4037          * @param string $skinName The Skin name to determine the correct OOUI theme
4038          * @param string $dir Language direction
4039          */
4040         public static function setupOOUI( $skinName = 'default', $dir = 'ltr' ) {
4041                 $themes = ResourceLoaderOOUIModule::getSkinThemeMap();
4042                 $theme = $themes[$skinName] ?? $themes['default'];
4043                 // For example, 'OOUI\WikimediaUITheme'.
4044                 $themeClass = "OOUI\\{$theme}Theme";
4045                 OOUI\Theme::setSingleton( new $themeClass() );
4046                 OOUI\Element::setDefaultDir( $dir );
4047         }
4048
4049         /**
4050          * Add ResourceLoader module styles for OOUI and set up the PHP implementation of it for use with
4051          * MediaWiki and this OutputPage instance.
4052          *
4053          * @since 1.25
4054          */
4055         public function enableOOUI() {
4056                 self::setupOOUI(
4057                         strtolower( $this->getSkin()->getSkinName() ),
4058                         $this->getLanguage()->getDir()
4059                 );
4060                 $this->addModuleStyles( [
4061                         'oojs-ui-core.styles',
4062                         'oojs-ui.styles.indicators',
4063                         'mediawiki.widgets.styles',
4064                         'oojs-ui-core.icons',
4065                 ] );
4066         }
4067
4068         /**
4069          * Get (and set if not yet set) the CSP nonce.
4070          *
4071          * This value needs to be included in any <script> tags on the
4072          * page.
4073          *
4074          * @return string|bool Nonce or false to mean don't output nonce
4075          * @since 1.32
4076          */
4077         public function getCSPNonce() {
4078                 if ( !ContentSecurityPolicy::isNonceRequired( $this->getConfig() ) ) {
4079                         return false;
4080                 }
4081                 if ( $this->CSPNonce === null ) {
4082                         // XXX It might be expensive to generate randomness
4083                         // on every request, on Windows.
4084                         $rand = random_bytes( 15 );
4085                         $this->CSPNonce = base64_encode( $rand );
4086                 }
4087                 return $this->CSPNonce;
4088         }
4089
4090 }