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          * @suppress PhanUndeclaredProperty For isBogus
1602          */
1603         public function parserOptions( $options = null ) {
1604                 if ( $options !== null ) {
1605                         wfDeprecated( __METHOD__ . ' with non-null $options', '1.31' );
1606                 }
1607
1608                 if ( $options !== null && !empty( $options->isBogus ) ) {
1609                         // Someone is trying to set a bogus pre-$wgUser PO. Check if it has
1610                         // been changed somehow, and keep it if so.
1611                         $anonPO = ParserOptions::newFromAnon();
1612                         $anonPO->setAllowUnsafeRawHtml( false );
1613                         if ( !$options->matches( $anonPO ) ) {
1614                                 wfLogWarning( __METHOD__ . ': Setting a changed bogus ParserOptions: ' . wfGetAllCallers( 5 ) );
1615                                 $options->isBogus = false;
1616                         }
1617                 }
1618
1619                 if ( !$this->mParserOptions ) {
1620                         if ( !$this->getUser()->isSafeToLoad() ) {
1621                                 // $wgUser isn't unstubbable yet, so don't try to get a
1622                                 // ParserOptions for it. And don't cache this ParserOptions
1623                                 // either.
1624                                 $po = ParserOptions::newFromAnon();
1625                                 $po->setAllowUnsafeRawHtml( false );
1626                                 $po->isBogus = true;
1627                                 if ( $options !== null ) {
1628                                         $this->mParserOptions = empty( $options->isBogus ) ? $options : null;
1629                                 }
1630                                 return $po;
1631                         }
1632
1633                         $this->mParserOptions = ParserOptions::newFromContext( $this->getContext() );
1634                         $this->mParserOptions->setAllowUnsafeRawHtml( false );
1635                 }
1636
1637                 if ( $options !== null && !empty( $options->isBogus ) ) {
1638                         // They're trying to restore the bogus pre-$wgUser PO. Do the right
1639                         // thing.
1640                         return wfSetVar( $this->mParserOptions, null, true );
1641                 } else {
1642                         return wfSetVar( $this->mParserOptions, $options );
1643                 }
1644         }
1645
1646         /**
1647          * Set the revision ID which will be seen by the wiki text parser
1648          * for things such as embedded {{REVISIONID}} variable use.
1649          *
1650          * @param int|null $revid A positive integer, or null
1651          * @return mixed Previous value
1652          */
1653         public function setRevisionId( $revid ) {
1654                 $val = is_null( $revid ) ? null : intval( $revid );
1655                 return wfSetVar( $this->mRevisionId, $val, true );
1656         }
1657
1658         /**
1659          * Get the displayed revision ID
1660          *
1661          * @return int
1662          */
1663         public function getRevisionId() {
1664                 return $this->mRevisionId;
1665         }
1666
1667         /**
1668          * Whether the revision displayed is the latest revision of the page
1669          *
1670          * @since 1.34
1671          * @return bool
1672          */
1673         public function isRevisionCurrent() {
1674                 return $this->mRevisionId == 0 || $this->mRevisionId == $this->getTitle()->getLatestRevID();
1675         }
1676
1677         /**
1678          * Set the timestamp of the revision which will be displayed. This is used
1679          * to avoid a extra DB call in Skin::lastModified().
1680          *
1681          * @param string|null $timestamp
1682          * @return mixed Previous value
1683          */
1684         public function setRevisionTimestamp( $timestamp ) {
1685                 return wfSetVar( $this->mRevisionTimestamp, $timestamp, true );
1686         }
1687
1688         /**
1689          * Get the timestamp of displayed revision.
1690          * This will be null if not filled by setRevisionTimestamp().
1691          *
1692          * @return string|null
1693          */
1694         public function getRevisionTimestamp() {
1695                 return $this->mRevisionTimestamp;
1696         }
1697
1698         /**
1699          * Set the displayed file version
1700          *
1701          * @param File|null $file
1702          * @return mixed Previous value
1703          */
1704         public function setFileVersion( $file ) {
1705                 $val = null;
1706                 if ( $file instanceof File && $file->exists() ) {
1707                         $val = [ 'time' => $file->getTimestamp(), 'sha1' => $file->getSha1() ];
1708                 }
1709                 return wfSetVar( $this->mFileVersion, $val, true );
1710         }
1711
1712         /**
1713          * Get the displayed file version
1714          *
1715          * @return array|null ('time' => MW timestamp, 'sha1' => sha1)
1716          */
1717         public function getFileVersion() {
1718                 return $this->mFileVersion;
1719         }
1720
1721         /**
1722          * Get the templates used on this page
1723          *
1724          * @return array (namespace => dbKey => revId)
1725          * @since 1.18
1726          */
1727         public function getTemplateIds() {
1728                 return $this->mTemplateIds;
1729         }
1730
1731         /**
1732          * Get the files used on this page
1733          *
1734          * @return array [ dbKey => [ 'time' => MW timestamp or null, 'sha1' => sha1 or '' ] ]
1735          * @since 1.18
1736          */
1737         public function getFileSearchOptions() {
1738                 return $this->mImageTimeKeys;
1739         }
1740
1741         /**
1742          * Convert wikitext *in the user interface language* to HTML and
1743          * add it to the buffer. The result will not be
1744          * language-converted, as user interface messages are already
1745          * localized into a specific variant.  Assumes that the current
1746          * page title will be used if optional $title is not
1747          * provided. Output will be tidy.
1748          *
1749          * @param string $text Wikitext in the user interface language
1750          * @param bool $linestart Is this the start of a line? (Defaults to true)
1751          * @param Title|null $title Optional title to use; default of `null`
1752          *   means use current page title.
1753          * @throws MWException if $title is not provided and OutputPage::getTitle()
1754          *   is null
1755          * @since 1.32
1756          */
1757         public function addWikiTextAsInterface(
1758                 $text, $linestart = true, Title $title = null
1759         ) {
1760                 if ( $title === null ) {
1761                         $title = $this->getTitle();
1762                 }
1763                 if ( !$title ) {
1764                         throw new MWException( 'Title is null' );
1765                 }
1766                 $this->addWikiTextTitleInternal( $text, $title, $linestart, /*interface*/true );
1767         }
1768
1769         /**
1770          * Convert wikitext *in the user interface language* to HTML and
1771          * add it to the buffer with a `<div class="$wrapperClass">`
1772          * wrapper.  The result will not be language-converted, as user
1773          * interface messages as already localized into a specific
1774          * variant.  The $text will be parsed in start-of-line context.
1775          * Output will be tidy.
1776          *
1777          * @param string $wrapperClass The class attribute value for the <div>
1778          *   wrapper in the output HTML
1779          * @param string $text Wikitext in the user interface language
1780          * @since 1.32
1781          */
1782         public function wrapWikiTextAsInterface(
1783                 $wrapperClass, $text
1784         ) {
1785                 $this->addWikiTextTitleInternal(
1786                         $text, $this->getTitle(),
1787                         /*linestart*/true, /*interface*/true,
1788                         $wrapperClass
1789                 );
1790         }
1791
1792         /**
1793          * Convert wikitext *in the page content language* to HTML and add
1794          * it to the buffer.  The result with be language-converted to the
1795          * user's preferred variant.  Assumes that the current page title
1796          * will be used if optional $title is not provided. Output will be
1797          * tidy.
1798          *
1799          * @param string $text Wikitext in the page content language
1800          * @param bool $linestart Is this the start of a line? (Defaults to true)
1801          * @param Title|null $title Optional title to use; default of `null`
1802          *   means use current page title.
1803          * @throws MWException if $title is not provided and OutputPage::getTitle()
1804          *   is null
1805          * @since 1.32
1806          */
1807         public function addWikiTextAsContent(
1808                 $text, $linestart = true, Title $title = null
1809         ) {
1810                 if ( $title === null ) {
1811                         $title = $this->getTitle();
1812                 }
1813                 if ( !$title ) {
1814                         throw new MWException( 'Title is null' );
1815                 }
1816                 $this->addWikiTextTitleInternal( $text, $title, $linestart, /*interface*/false );
1817         }
1818
1819         /**
1820          * Add wikitext with a custom Title object.
1821          * Output is unwrapped.
1822          *
1823          * @param string $text Wikitext
1824          * @param Title $title
1825          * @param bool $linestart Is this the start of a line?
1826          * @param bool $interface Whether it is an interface message
1827          *   (for example disables conversion)
1828          * @param string $wrapperClass if not empty, wraps the output in
1829          *   a `<div class="$wrapperClass">`
1830          */
1831         private function addWikiTextTitleInternal(
1832                 $text, Title $title, $linestart, $interface, $wrapperClass = null
1833         ) {
1834                 $parserOutput = $this->parseInternal(
1835                         $text, $title, $linestart, true, $interface, /*language*/null
1836                 );
1837
1838                 $this->addParserOutput( $parserOutput, [
1839                         'enableSectionEditLinks' => false,
1840                         'wrapperDivClass' => $wrapperClass ?? '',
1841                 ] );
1842         }
1843
1844         /**
1845          * Add all metadata associated with a ParserOutput object, but without the actual HTML. This
1846          * includes categories, language links, ResourceLoader modules, effects of certain magic words,
1847          * and so on.
1848          *
1849          * @since 1.24
1850          * @param ParserOutput $parserOutput
1851          */
1852         public function addParserOutputMetadata( ParserOutput $parserOutput ) {
1853                 $this->mLanguageLinks =
1854                         array_merge( $this->mLanguageLinks, $parserOutput->getLanguageLinks() );
1855                 $this->addCategoryLinks( $parserOutput->getCategories() );
1856                 $this->setIndicators( $parserOutput->getIndicators() );
1857                 $this->mNewSectionLink = $parserOutput->getNewSection();
1858                 $this->mHideNewSectionLink = $parserOutput->getHideNewSection();
1859
1860                 if ( !$parserOutput->isCacheable() ) {
1861                         $this->enableClientCache( false );
1862                 }
1863                 $this->mNoGallery = $parserOutput->getNoGallery();
1864                 $this->mHeadItems = array_merge( $this->mHeadItems, $parserOutput->getHeadItems() );
1865                 $this->addModules( $parserOutput->getModules() );
1866                 $this->addModuleStyles( $parserOutput->getModuleStyles() );
1867                 $this->addJsConfigVars( $parserOutput->getJsConfigVars() );
1868                 $this->mPreventClickjacking = $this->mPreventClickjacking
1869                         || $parserOutput->preventClickjacking();
1870
1871                 // Template versioning...
1872                 foreach ( (array)$parserOutput->getTemplateIds() as $ns => $dbks ) {
1873                         if ( isset( $this->mTemplateIds[$ns] ) ) {
1874                                 $this->mTemplateIds[$ns] = $dbks + $this->mTemplateIds[$ns];
1875                         } else {
1876                                 $this->mTemplateIds[$ns] = $dbks;
1877                         }
1878                 }
1879                 // File versioning...
1880                 foreach ( (array)$parserOutput->getFileSearchOptions() as $dbk => $data ) {
1881                         $this->mImageTimeKeys[$dbk] = $data;
1882                 }
1883
1884                 // Hooks registered in the object
1885                 $parserOutputHooks = $this->getConfig()->get( 'ParserOutputHooks' );
1886                 foreach ( $parserOutput->getOutputHooks() as $hookInfo ) {
1887                         list( $hookName, $data ) = $hookInfo;
1888                         if ( isset( $parserOutputHooks[$hookName] ) ) {
1889                                 $parserOutputHooks[$hookName]( $this, $parserOutput, $data );
1890                         }
1891                 }
1892
1893                 // Enable OOUI if requested via ParserOutput
1894                 if ( $parserOutput->getEnableOOUI() ) {
1895                         $this->enableOOUI();
1896                 }
1897
1898                 // Include parser limit report
1899                 if ( !$this->limitReportJSData ) {
1900                         $this->limitReportJSData = $parserOutput->getLimitReportJSData();
1901                 }
1902
1903                 // Link flags are ignored for now, but may in the future be
1904                 // used to mark individual language links.
1905                 $linkFlags = [];
1906                 // Avoid PHP 7.1 warning of passing $this by reference
1907                 $outputPage = $this;
1908                 Hooks::run( 'LanguageLinks', [ $this->getTitle(), &$this->mLanguageLinks, &$linkFlags ] );
1909                 Hooks::runWithoutAbort( 'OutputPageParserOutput', [ &$outputPage, $parserOutput ] );
1910
1911                 // This check must be after 'OutputPageParserOutput' runs in addParserOutputMetadata
1912                 // so that extensions may modify ParserOutput to toggle TOC.
1913                 // This cannot be moved to addParserOutputText because that is not
1914                 // called by EditPage for Preview.
1915                 if ( $parserOutput->getTOCHTML() ) {
1916                         $this->mEnableTOC = true;
1917                 }
1918         }
1919
1920         /**
1921          * Add the HTML and enhancements for it (like ResourceLoader modules) associated with a
1922          * ParserOutput object, without any other metadata.
1923          *
1924          * @since 1.24
1925          * @param ParserOutput $parserOutput
1926          * @param array $poOptions Options to ParserOutput::getText()
1927          */
1928         public function addParserOutputContent( ParserOutput $parserOutput, $poOptions = [] ) {
1929                 $this->addParserOutputText( $parserOutput, $poOptions );
1930
1931                 $this->addModules( $parserOutput->getModules() );
1932                 $this->addModuleStyles( $parserOutput->getModuleStyles() );
1933
1934                 $this->addJsConfigVars( $parserOutput->getJsConfigVars() );
1935         }
1936
1937         /**
1938          * Add the HTML associated with a ParserOutput object, without any metadata.
1939          *
1940          * @since 1.24
1941          * @param ParserOutput $parserOutput
1942          * @param array $poOptions Options to ParserOutput::getText()
1943          */
1944         public function addParserOutputText( ParserOutput $parserOutput, $poOptions = [] ) {
1945                 $text = $parserOutput->getText( $poOptions );
1946                 // Avoid PHP 7.1 warning of passing $this by reference
1947                 $outputPage = $this;
1948                 Hooks::runWithoutAbort( 'OutputPageBeforeHTML', [ &$outputPage, &$text ] );
1949                 $this->addHTML( $text );
1950         }
1951
1952         /**
1953          * Add everything from a ParserOutput object.
1954          *
1955          * @param ParserOutput $parserOutput
1956          * @param array $poOptions Options to ParserOutput::getText()
1957          */
1958         function addParserOutput( ParserOutput $parserOutput, $poOptions = [] ) {
1959                 $this->addParserOutputMetadata( $parserOutput );
1960                 $this->addParserOutputText( $parserOutput, $poOptions );
1961         }
1962
1963         /**
1964          * Add the output of a QuickTemplate to the output buffer
1965          *
1966          * @param QuickTemplate &$template
1967          */
1968         public function addTemplate( &$template ) {
1969                 $this->addHTML( $template->getHTML() );
1970         }
1971
1972         /**
1973          * Parse wikitext and return the HTML.
1974          *
1975          * @todo The output is wrapped in a <div> iff $interface is false; it's
1976          * probably best to always strip the wrapper.
1977          *
1978          * @param string $text
1979          * @param bool $linestart Is this the start of a line?
1980          * @param bool $interface Use interface language (instead of content language) while parsing
1981          *   language sensitive magic words like GRAMMAR and PLURAL.  This also disables
1982          *   LanguageConverter.
1983          * @param Language|null $language Target language object, will override $interface
1984          * @throws MWException
1985          * @return string HTML
1986          * @deprecated since 1.32, due to untidy output and inconsistent wrapper;
1987          *  use parseAsContent() if $interface is default value or false, or else
1988          *  parseAsInterface() if $interface is true.
1989          */
1990         public function parse( $text, $linestart = true, $interface = false, $language = null ) {
1991                 wfDeprecated( __METHOD__, '1.33' );
1992                 return $this->parseInternal(
1993                         $text, $this->getTitle(), $linestart, /*tidy*/false, $interface, $language
1994                 )->getText( [
1995                         'enableSectionEditLinks' => false,
1996                 ] );
1997         }
1998
1999         /**
2000          * Parse wikitext *in the page content language* and return the HTML.
2001          * The result will be language-converted to the user's preferred variant.
2002          * Output will be tidy.
2003          *
2004          * @param string $text Wikitext in the page content language
2005          * @param bool $linestart Is this the start of a line? (Defaults to true)
2006          * @throws MWException
2007          * @return string HTML
2008          * @since 1.32
2009          */
2010         public function parseAsContent( $text, $linestart = true ) {
2011                 return $this->parseInternal(
2012                         $text, $this->getTitle(), $linestart, /*tidy*/true, /*interface*/false, /*language*/null
2013                 )->getText( [
2014                         'enableSectionEditLinks' => false,
2015                         'wrapperDivClass' => ''
2016                 ] );
2017         }
2018
2019         /**
2020          * Parse wikitext *in the user interface language* and return the HTML.
2021          * The result will not be language-converted, as user interface messages
2022          * are already localized into a specific variant.
2023          * Output will be tidy.
2024          *
2025          * @param string $text Wikitext in the user interface language
2026          * @param bool $linestart Is this the start of a line? (Defaults to true)
2027          * @throws MWException
2028          * @return string HTML
2029          * @since 1.32
2030          */
2031         public function parseAsInterface( $text, $linestart = true ) {
2032                 return $this->parseInternal(
2033                         $text, $this->getTitle(), $linestart, /*tidy*/true, /*interface*/true, /*language*/null
2034                 )->getText( [
2035                         'enableSectionEditLinks' => false,
2036                         'wrapperDivClass' => ''
2037                 ] );
2038         }
2039
2040         /**
2041          * Parse wikitext *in the user interface language*, strip
2042          * paragraph wrapper, and return the HTML.
2043          * The result will not be language-converted, as user interface messages
2044          * are already localized into a specific variant.
2045          * Output will be tidy.  Outer paragraph wrapper will only be stripped
2046          * if the result is a single paragraph.
2047          *
2048          * @param string $text Wikitext in the user interface language
2049          * @param bool $linestart Is this the start of a line? (Defaults to true)
2050          * @throws MWException
2051          * @return string HTML
2052          * @since 1.32
2053          */
2054         public function parseInlineAsInterface( $text, $linestart = true ) {
2055                 return Parser::stripOuterParagraph(
2056                         $this->parseAsInterface( $text, $linestart )
2057                 );
2058         }
2059
2060         /**
2061          * Parse wikitext, strip paragraph wrapper, and return the HTML.
2062          *
2063          * @param string $text
2064          * @param bool $linestart Is this the start of a line?
2065          * @param bool $interface Use interface language (instead of content language) while parsing
2066          *   language sensitive magic words like GRAMMAR and PLURAL
2067          * @return string HTML
2068          * @deprecated since 1.32, due to untidy output and confusing default
2069          *   for $interface.  Use parseInlineAsInterface() if $interface is
2070          *   the default value or false, or else use
2071          *   Parser::stripOuterParagraph($outputPage->parseAsContent(...)).
2072          */
2073         public function parseInline( $text, $linestart = true, $interface = false ) {
2074                 wfDeprecated( __METHOD__, '1.33' );
2075                 $parsed = $this->parseInternal(
2076                         $text, $this->getTitle(), $linestart, /*tidy*/false, $interface, /*language*/null
2077                 )->getText( [
2078                         'enableSectionEditLinks' => false,
2079                         'wrapperDivClass' => '', /* no wrapper div */
2080                 ] );
2081                 return Parser::stripOuterParagraph( $parsed );
2082         }
2083
2084         /**
2085          * Parse wikitext and return the HTML (internal implementation helper)
2086          *
2087          * @param string $text
2088          * @param Title $title The title to use
2089          * @param bool $linestart Is this the start of a line?
2090          * @param bool $tidy Whether the output should be tidied
2091          * @param bool $interface Use interface language (instead of content language) while parsing
2092          *   language sensitive magic words like GRAMMAR and PLURAL.  This also disables
2093          *   LanguageConverter.
2094          * @param Language|null $language Target language object, will override $interface
2095          * @throws MWException
2096          * @return ParserOutput
2097          */
2098         private function parseInternal( $text, $title, $linestart, $tidy, $interface, $language ) {
2099                 if ( is_null( $title ) ) {
2100                         throw new MWException( 'Empty $mTitle in ' . __METHOD__ );
2101                 }
2102
2103                 $popts = $this->parserOptions();
2104                 $oldTidy = $popts->setTidy( $tidy );
2105                 $oldInterface = $popts->setInterfaceMessage( (bool)$interface );
2106
2107                 if ( $language !== null ) {
2108                         $oldLang = $popts->setTargetLanguage( $language );
2109                 }
2110
2111                 $parserOutput = MediaWikiServices::getInstance()->getParser()->getFreshParser()->parse(
2112                         $text, $title, $popts,
2113                         $linestart, true, $this->mRevisionId
2114                 );
2115
2116                 $popts->setTidy( $oldTidy );
2117                 $popts->setInterfaceMessage( $oldInterface );
2118
2119                 if ( $language !== null ) {
2120                         $popts->setTargetLanguage( $oldLang );
2121                 }
2122
2123                 return $parserOutput;
2124         }
2125
2126         /**
2127          * Set the value of the "s-maxage" part of the "Cache-control" HTTP header
2128          *
2129          * @param int $maxage Maximum cache time on the CDN, in seconds.
2130          */
2131         public function setCdnMaxage( $maxage ) {
2132                 $this->mCdnMaxage = min( $maxage, $this->mCdnMaxageLimit );
2133         }
2134
2135         /**
2136          * Set the value of the "s-maxage" part of the "Cache-control" HTTP header to $maxage if that is
2137          * lower than the current s-maxage.  Either way, $maxage is now an upper limit on s-maxage, so
2138          * that future calls to setCdnMaxage() will no longer be able to raise the s-maxage above
2139          * $maxage.
2140          *
2141          * @param int $maxage Maximum cache time on the CDN, in seconds
2142          * @since 1.27
2143          */
2144         public function lowerCdnMaxage( $maxage ) {
2145                 $this->mCdnMaxageLimit = min( $maxage, $this->mCdnMaxageLimit );
2146                 $this->setCdnMaxage( $this->mCdnMaxage );
2147         }
2148
2149         /**
2150          * Get TTL in [$minTTL,$maxTTL] in pass it to lowerCdnMaxage()
2151          *
2152          * This sets and returns $minTTL if $mtime is false or null. Otherwise,
2153          * the TTL is higher the older the $mtime timestamp is. Essentially, the
2154          * TTL is 90% of the age of the object, subject to the min and max.
2155          *
2156          * @param string|int|float|bool|null $mtime Last-Modified timestamp
2157          * @param int $minTTL Minimum TTL in seconds [default: 1 minute]
2158          * @param int $maxTTL Maximum TTL in seconds [default: $wgCdnMaxAge]
2159          * @since 1.28
2160          */
2161         public function adaptCdnTTL( $mtime, $minTTL = 0, $maxTTL = 0 ) {
2162                 $minTTL = $minTTL ?: IExpiringStore::TTL_MINUTE;
2163                 $maxTTL = $maxTTL ?: $this->getConfig()->get( 'CdnMaxAge' );
2164
2165                 if ( $mtime === null || $mtime === false ) {
2166                         return $minTTL; // entity does not exist
2167                 }
2168
2169                 $age = MWTimestamp::time() - wfTimestamp( TS_UNIX, $mtime );
2170                 $adaptiveTTL = max( 0.9 * $age, $minTTL );
2171                 $adaptiveTTL = min( $adaptiveTTL, $maxTTL );
2172
2173                 $this->lowerCdnMaxage( (int)$adaptiveTTL );
2174         }
2175
2176         /**
2177          * Use enableClientCache(false) to force it to send nocache headers
2178          *
2179          * @param bool|null $state New value, or null to not set the value
2180          *
2181          * @return bool Old value
2182          */
2183         public function enableClientCache( $state ) {
2184                 return wfSetVar( $this->mEnableClientCache, $state );
2185         }
2186
2187         /**
2188          * Get the list of cookie names that will influence the cache
2189          *
2190          * @return array
2191          */
2192         function getCacheVaryCookies() {
2193                 if ( self::$cacheVaryCookies === null ) {
2194                         $config = $this->getConfig();
2195                         self::$cacheVaryCookies = array_values( array_unique( array_merge(
2196                                 SessionManager::singleton()->getVaryCookies(),
2197                                 [
2198                                         'forceHTTPS',
2199                                 ],
2200                                 $config->get( 'CacheVaryCookies' )
2201                         ) ) );
2202                         Hooks::run( 'GetCacheVaryCookies', [ $this, &self::$cacheVaryCookies ] );
2203                 }
2204                 return self::$cacheVaryCookies;
2205         }
2206
2207         /**
2208          * Check if the request has a cache-varying cookie header
2209          * If it does, it's very important that we don't allow public caching
2210          *
2211          * @return bool
2212          */
2213         function haveCacheVaryCookies() {
2214                 $request = $this->getRequest();
2215                 foreach ( $this->getCacheVaryCookies() as $cookieName ) {
2216                         if ( $request->getCookie( $cookieName, '', '' ) !== '' ) {
2217                                 wfDebug( __METHOD__ . ": found $cookieName\n" );
2218                                 return true;
2219                         }
2220                 }
2221                 wfDebug( __METHOD__ . ": no cache-varying cookies found\n" );
2222                 return false;
2223         }
2224
2225         /**
2226          * Add an HTTP header that will influence on the cache
2227          *
2228          * @param string $header Header name
2229          * @param string[]|null $option Deprecated; formerly options for the
2230          *  Key header, deprecated in 1.32 and removed in 1.34. See
2231          *   https://datatracker.ietf.org/doc/draft-fielding-http-key/
2232          *   for the list of formerly-valid options.
2233          */
2234         public function addVaryHeader( $header, array $option = null ) {
2235                 if ( $option !== null && count( $option ) > 0 ) {
2236                         wfDeprecated( 'addVaryHeader $option is ignored', '1.34' );
2237                 }
2238                 if ( !array_key_exists( $header, $this->mVaryHeader ) ) {
2239                         $this->mVaryHeader[$header] = null;
2240                 }
2241         }
2242
2243         /**
2244          * Return a Vary: header on which to vary caches. Based on the keys of $mVaryHeader,
2245          * such as Accept-Encoding or Cookie
2246          *
2247          * @return string
2248          */
2249         public function getVaryHeader() {
2250                 // If we vary on cookies, let's make sure it's always included here too.
2251                 if ( $this->getCacheVaryCookies() ) {
2252                         $this->addVaryHeader( 'Cookie' );
2253                 }
2254
2255                 foreach ( SessionManager::singleton()->getVaryHeaders() as $header => $options ) {
2256                         $this->addVaryHeader( $header, $options );
2257                 }
2258                 return 'Vary: ' . implode( ', ', array_keys( $this->mVaryHeader ) );
2259         }
2260
2261         /**
2262          * Add an HTTP Link: header
2263          *
2264          * @param string $header Header value
2265          */
2266         public function addLinkHeader( $header ) {
2267                 $this->mLinkHeader[] = $header;
2268         }
2269
2270         /**
2271          * Return a Link: header. Based on the values of $mLinkHeader.
2272          *
2273          * @return string
2274          */
2275         public function getLinkHeader() {
2276                 if ( !$this->mLinkHeader ) {
2277                         return false;
2278                 }
2279
2280                 return 'Link: ' . implode( ',', $this->mLinkHeader );
2281         }
2282
2283         /**
2284          * T23672: Add Accept-Language to Vary header if there's no 'variant' parameter in GET.
2285          *
2286          * For example:
2287          *   /w/index.php?title=Main_page will vary based on Accept-Language; but
2288          *   /w/index.php?title=Main_page&variant=zh-cn will not.
2289          */
2290         private function addAcceptLanguage() {
2291                 $title = $this->getTitle();
2292                 if ( !$title instanceof Title ) {
2293                         return;
2294                 }
2295
2296                 $lang = $title->getPageLanguage();
2297                 if ( !$this->getRequest()->getCheck( 'variant' ) && $lang->hasVariants() ) {
2298                         $this->addVaryHeader( 'Accept-Language' );
2299                 }
2300         }
2301
2302         /**
2303          * Set a flag which will cause an X-Frame-Options header appropriate for
2304          * edit pages to be sent. The header value is controlled by
2305          * $wgEditPageFrameOptions.
2306          *
2307          * This is the default for special pages. If you display a CSRF-protected
2308          * form on an ordinary view page, then you need to call this function.
2309          *
2310          * @param bool $enable
2311          */
2312         public function preventClickjacking( $enable = true ) {
2313                 $this->mPreventClickjacking = $enable;
2314         }
2315
2316         /**
2317          * Turn off frame-breaking. Alias for $this->preventClickjacking(false).
2318          * This can be called from pages which do not contain any CSRF-protected
2319          * HTML form.
2320          */
2321         public function allowClickjacking() {
2322                 $this->mPreventClickjacking = false;
2323         }
2324
2325         /**
2326          * Get the prevent-clickjacking flag
2327          *
2328          * @since 1.24
2329          * @return bool
2330          */
2331         public function getPreventClickjacking() {
2332                 return $this->mPreventClickjacking;
2333         }
2334
2335         /**
2336          * Get the X-Frame-Options header value (without the name part), or false
2337          * if there isn't one. This is used by Skin to determine whether to enable
2338          * JavaScript frame-breaking, for clients that don't support X-Frame-Options.
2339          *
2340          * @return string|false
2341          */
2342         public function getFrameOptions() {
2343                 $config = $this->getConfig();
2344                 if ( $config->get( 'BreakFrames' ) ) {
2345                         return 'DENY';
2346                 } elseif ( $this->mPreventClickjacking && $config->get( 'EditPageFrameOptions' ) ) {
2347                         return $config->get( 'EditPageFrameOptions' );
2348                 }
2349                 return false;
2350         }
2351
2352         /**
2353          * Get the Origin-Trial header values. This is used to enable Chrome Origin
2354          * Trials: https://github.com/GoogleChrome/OriginTrials
2355          *
2356          * @return array
2357          */
2358         private function getOriginTrials() {
2359                 $config = $this->getConfig();
2360
2361                 return $config->get( 'OriginTrials' );
2362         }
2363
2364         private function getReportTo() {
2365                 $config = $this->getConfig();
2366
2367                 $expiry = $config->get( 'ReportToExpiry' );
2368
2369                 if ( !$expiry ) {
2370                         return false;
2371                 }
2372
2373                 $endpoints = $config->get( 'ReportToEndpoints' );
2374
2375                 if ( !$endpoints ) {
2376                         return false;
2377                 }
2378
2379                 $output = [ 'max_age' => $expiry, 'endpoints' => [] ];
2380
2381                 foreach ( $endpoints as $endpoint ) {
2382                         $output['endpoints'][] = [ 'url' => $endpoint ];
2383                 }
2384
2385                 return json_encode( $output, JSON_UNESCAPED_SLASHES );
2386         }
2387
2388         private function getFeaturePolicyReportOnly() {
2389                 $config = $this->getConfig();
2390
2391                 $features = $config->get( 'FeaturePolicyReportOnly' );
2392                 return implode( ';', $features );
2393         }
2394
2395         /**
2396          * Send cache control HTTP headers
2397          */
2398         public function sendCacheControl() {
2399                 $response = $this->getRequest()->response();
2400                 $config = $this->getConfig();
2401
2402                 $this->addVaryHeader( 'Cookie' );
2403                 $this->addAcceptLanguage();
2404
2405                 # don't serve compressed data to clients who can't handle it
2406                 # maintain different caches for logged-in users and non-logged in ones
2407                 $response->header( $this->getVaryHeader() );
2408
2409                 if ( $this->mEnableClientCache ) {
2410                         if (
2411                                 $config->get( 'UseCdn' ) &&
2412                                 !$response->hasCookies() &&
2413                                 !SessionManager::getGlobalSession()->isPersistent() &&
2414                                 !$this->isPrintable() &&
2415                                 $this->mCdnMaxage != 0 &&
2416                                 !$this->haveCacheVaryCookies()
2417                         ) {
2418                                 # We'll purge the proxy cache for anons explicitly, but require end user agents
2419                                 # to revalidate against the proxy on each visit.
2420                                 # IMPORTANT! The CDN needs to replace the Cache-Control header with
2421                                 # Cache-Control: s-maxage=0, must-revalidate, max-age=0
2422                                 wfDebug( __METHOD__ .
2423                                         ": local proxy caching; {$this->mLastModified} **", 'private' );
2424                                 # start with a shorter timeout for initial testing
2425                                 # header( "Cache-Control: s-maxage=2678400, must-revalidate, max-age=0" );
2426                                 $response->header( "Cache-Control: " .
2427                                         "s-maxage={$this->mCdnMaxage}, must-revalidate, max-age=0" );
2428                         } else {
2429                                 # We do want clients to cache if they can, but they *must* check for updates
2430                                 # on revisiting the page.
2431                                 wfDebug( __METHOD__ . ": private caching; {$this->mLastModified} **", 'private' );
2432                                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
2433                                 $response->header( "Cache-Control: private, must-revalidate, max-age=0" );
2434                         }
2435                         if ( $this->mLastModified ) {
2436                                 $response->header( "Last-Modified: {$this->mLastModified}" );
2437                         }
2438                 } else {
2439                         wfDebug( __METHOD__ . ": no caching **", 'private' );
2440
2441                         # In general, the absence of a last modified header should be enough to prevent
2442                         # the client from using its cache. We send a few other things just to make sure.
2443                         $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
2444                         $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
2445                         $response->header( 'Pragma: no-cache' );
2446                 }
2447         }
2448
2449         /**
2450          * Transfer styles and JavaScript modules from skin.
2451          *
2452          * @param Skin $sk to load modules for
2453          */
2454         public function loadSkinModules( $sk ) {
2455                 foreach ( $sk->getDefaultModules() as $group => $modules ) {
2456                         if ( $group === 'styles' ) {
2457                                 foreach ( $modules as $key => $moduleMembers ) {
2458                                         $this->addModuleStyles( $moduleMembers );
2459                                 }
2460                         } else {
2461                                 $this->addModules( $modules );
2462                         }
2463                 }
2464         }
2465
2466         /**
2467          * Finally, all the text has been munged and accumulated into
2468          * the object, let's actually output it:
2469          *
2470          * @param bool $return Set to true to get the result as a string rather than sending it
2471          * @return string|null
2472          * @throws Exception
2473          * @throws FatalError
2474          * @throws MWException
2475          */
2476         public function output( $return = false ) {
2477                 if ( $this->mDoNothing ) {
2478                         return $return ? '' : null;
2479                 }
2480
2481                 $response = $this->getRequest()->response();
2482                 $config = $this->getConfig();
2483
2484                 if ( $this->mRedirect != '' ) {
2485                         # Standards require redirect URLs to be absolute
2486                         $this->mRedirect = wfExpandUrl( $this->mRedirect, PROTO_CURRENT );
2487
2488                         $redirect = $this->mRedirect;
2489                         $code = $this->mRedirectCode;
2490
2491                         if ( Hooks::run( "BeforePageRedirect", [ $this, &$redirect, &$code ] ) ) {
2492                                 if ( $code == '301' || $code == '303' ) {
2493                                         if ( !$config->get( 'DebugRedirects' ) ) {
2494                                                 $response->statusHeader( $code );
2495                                         }
2496                                         $this->mLastModified = wfTimestamp( TS_RFC2822 );
2497                                 }
2498                                 if ( $config->get( 'VaryOnXFP' ) ) {
2499                                         $this->addVaryHeader( 'X-Forwarded-Proto' );
2500                                 }
2501                                 $this->sendCacheControl();
2502
2503                                 $response->header( "Content-Type: text/html; charset=utf-8" );
2504                                 if ( $config->get( 'DebugRedirects' ) ) {
2505                                         $url = htmlspecialchars( $redirect );
2506                                         print "<!DOCTYPE html>\n<html>\n<head>\n<title>Redirect</title>\n</head>\n<body>\n";
2507                                         print "<p>Location: <a href=\"$url\">$url</a></p>\n";
2508                                         print "</body>\n</html>\n";
2509                                 } else {
2510                                         $response->header( 'Location: ' . $redirect );
2511                                 }
2512                         }
2513
2514                         return $return ? '' : null;
2515                 } elseif ( $this->mStatusCode ) {
2516                         $response->statusHeader( $this->mStatusCode );
2517                 }
2518
2519                 # Buffer output; final headers may depend on later processing
2520                 ob_start();
2521
2522                 $response->header( 'Content-type: ' . $config->get( 'MimeType' ) . '; charset=UTF-8' );
2523                 $response->header( 'Content-language: ' .
2524                         MediaWikiServices::getInstance()->getContentLanguage()->getHtmlCode() );
2525
2526                 $linkHeader = $this->getLinkHeader();
2527                 if ( $linkHeader ) {
2528                         $response->header( $linkHeader );
2529                 }
2530
2531                 // Prevent framing, if requested
2532                 $frameOptions = $this->getFrameOptions();
2533                 if ( $frameOptions ) {
2534                         $response->header( "X-Frame-Options: $frameOptions" );
2535                 }
2536
2537                 $originTrials = $this->getOriginTrials();
2538                 foreach ( $originTrials as $originTrial ) {
2539                         $response->header( "Origin-Trial: $originTrial", false );
2540                 }
2541
2542                 $reportTo = $this->getReportTo();
2543                 if ( $reportTo ) {
2544                         $response->header( "Report-To: $reportTo" );
2545                 }
2546
2547                 $featurePolicyReportOnly = $this->getFeaturePolicyReportOnly();
2548                 if ( $featurePolicyReportOnly ) {
2549                         $response->header( "Feature-Policy-Report-Only: $featurePolicyReportOnly" );
2550                 }
2551
2552                 ContentSecurityPolicy::sendHeaders( $this );
2553
2554                 if ( $this->mArticleBodyOnly ) {
2555                         echo $this->mBodytext;
2556                 } else {
2557                         // Enable safe mode if requested (T152169)
2558                         if ( $this->getRequest()->getBool( 'safemode' ) ) {
2559                                 $this->disallowUserJs();
2560                         }
2561
2562                         $sk = $this->getSkin();
2563                         $this->loadSkinModules( $sk );
2564
2565                         MWDebug::addModules( $this );
2566
2567                         // Avoid PHP 7.1 warning of passing $this by reference
2568                         $outputPage = $this;
2569                         // Hook that allows last minute changes to the output page, e.g.
2570                         // adding of CSS or Javascript by extensions.
2571                         Hooks::runWithoutAbort( 'BeforePageDisplay', [ &$outputPage, &$sk ] );
2572
2573                         try {
2574                                 $sk->outputPage();
2575                         } catch ( Exception $e ) {
2576                                 ob_end_clean(); // bug T129657
2577                                 throw $e;
2578                         }
2579                 }
2580
2581                 try {
2582                         // This hook allows last minute changes to final overall output by modifying output buffer
2583                         Hooks::runWithoutAbort( 'AfterFinalPageOutput', [ $this ] );
2584                 } catch ( Exception $e ) {
2585                         ob_end_clean(); // bug T129657
2586                         throw $e;
2587                 }
2588
2589                 $this->sendCacheControl();
2590
2591                 if ( $return ) {
2592                         return ob_get_clean();
2593                 } else {
2594                         ob_end_flush();
2595                         return null;
2596                 }
2597         }
2598
2599         /**
2600          * Prepare this object to display an error page; disable caching and
2601          * indexing, clear the current text and redirect, set the page's title
2602          * and optionally an custom HTML title (content of the "<title>" tag).
2603          *
2604          * @param string|Message $pageTitle Will be passed directly to setPageTitle()
2605          * @param string|Message $htmlTitle Will be passed directly to setHTMLTitle();
2606          *                   optional, if not passed the "<title>" attribute will be
2607          *                   based on $pageTitle
2608          */
2609         public function prepareErrorPage( $pageTitle, $htmlTitle = false ) {
2610                 $this->setPageTitle( $pageTitle );
2611                 if ( $htmlTitle !== false ) {
2612                         $this->setHTMLTitle( $htmlTitle );
2613                 }
2614                 $this->setRobotPolicy( 'noindex,nofollow' );
2615                 $this->setArticleRelated( false );
2616                 $this->enableClientCache( false );
2617                 $this->mRedirect = '';
2618                 $this->clearSubtitle();
2619                 $this->clearHTML();
2620         }
2621
2622         /**
2623          * Output a standard error page
2624          *
2625          * showErrorPage( 'titlemsg', 'pagetextmsg' );
2626          * showErrorPage( 'titlemsg', 'pagetextmsg', [ 'param1', 'param2' ] );
2627          * showErrorPage( 'titlemsg', $messageObject );
2628          * showErrorPage( $titleMessageObject, $messageObject );
2629          *
2630          * @param string|Message $title Message key (string) for page title, or a Message object
2631          * @param string|Message $msg Message key (string) for page text, or a Message object
2632          * @param array $params Message parameters; ignored if $msg is a Message object
2633          */
2634         public function showErrorPage( $title, $msg, $params = [] ) {
2635                 if ( !$title instanceof Message ) {
2636                         $title = $this->msg( $title );
2637                 }
2638
2639                 $this->prepareErrorPage( $title );
2640
2641                 if ( $msg instanceof Message ) {
2642                         if ( $params !== [] ) {
2643                                 trigger_error( 'Argument ignored: $params. The message parameters argument '
2644                                         . 'is discarded when the $msg argument is a Message object instead of '
2645                                         . 'a string.', E_USER_NOTICE );
2646                         }
2647                         $this->addHTML( $msg->parseAsBlock() );
2648                 } else {
2649                         $this->addWikiMsgArray( $msg, $params );
2650                 }
2651
2652                 $this->returnToMain();
2653         }
2654
2655         /**
2656          * Output a standard permission error page
2657          *
2658          * @param array $errors Error message keys or [key, param...] arrays
2659          * @param string|null $action Action that was denied or null if unknown
2660          */
2661         public function showPermissionsErrorPage( array $errors, $action = null ) {
2662                 $services = MediaWikiServices::getInstance();
2663                 $permissionManager = $services->getPermissionManager();
2664                 foreach ( $errors as $key => $error ) {
2665                         $errors[$key] = (array)$error;
2666                 }
2667
2668                 // For some action (read, edit, create and upload), display a "login to do this action"
2669                 // error if all of the following conditions are met:
2670                 // 1. the user is not logged in
2671                 // 2. the only error is insufficient permissions (i.e. no block or something else)
2672                 // 3. the error can be avoided simply by logging in
2673
2674                 if ( in_array( $action, [ 'read', 'edit', 'createpage', 'createtalk', 'upload' ] )
2675                         && $this->getUser()->isAnon() && count( $errors ) == 1 && isset( $errors[0][0] )
2676                         && ( $errors[0][0] == 'badaccess-groups' || $errors[0][0] == 'badaccess-group0' )
2677                         && ( $permissionManager->groupHasPermission( 'user', $action )
2678                                 || $permissionManager->groupHasPermission( 'autoconfirmed', $action ) )
2679                 ) {
2680                         $displayReturnto = null;
2681
2682                         # Due to T34276, if a user does not have read permissions,
2683                         # $this->getTitle() will just give Special:Badtitle, which is
2684                         # not especially useful as a returnto parameter. Use the title
2685                         # from the request instead, if there was one.
2686                         $request = $this->getRequest();
2687                         $returnto = Title::newFromText( $request->getVal( 'title', '' ) );
2688                         if ( $action == 'edit' ) {
2689                                 $msg = 'whitelistedittext';
2690                                 $displayReturnto = $returnto;
2691                         } elseif ( $action == 'createpage' || $action == 'createtalk' ) {
2692                                 $msg = 'nocreatetext';
2693                         } elseif ( $action == 'upload' ) {
2694                                 $msg = 'uploadnologintext';
2695                         } else { # Read
2696                                 $msg = 'loginreqpagetext';
2697                                 $displayReturnto = Title::newMainPage();
2698                         }
2699
2700                         $query = [];
2701
2702                         if ( $returnto ) {
2703                                 $query['returnto'] = $returnto->getPrefixedText();
2704
2705                                 if ( !$request->wasPosted() ) {
2706                                         $returntoquery = $request->getValues();
2707                                         unset( $returntoquery['title'] );
2708                                         unset( $returntoquery['returnto'] );
2709                                         unset( $returntoquery['returntoquery'] );
2710                                         $query['returntoquery'] = wfArrayToCgi( $returntoquery );
2711                                 }
2712                         }
2713
2714                         $title = SpecialPage::getTitleFor( 'Userlogin' );
2715                         $linkRenderer = $services->getLinkRenderer();
2716                         $loginUrl = $title->getLinkURL( $query, false, PROTO_RELATIVE );
2717                         $loginLink = $linkRenderer->makeKnownLink(
2718                                 $title,
2719                                 $this->msg( 'loginreqlink' )->text(),
2720                                 [],
2721                                 $query
2722                         );
2723
2724                         $this->prepareErrorPage( $this->msg( 'loginreqtitle' ) );
2725                         $this->addHTML( $this->msg( $msg )->rawParams( $loginLink )->params( $loginUrl )->parse() );
2726
2727                         # Don't return to a page the user can't read otherwise
2728                         # we'll end up in a pointless loop
2729                         if ( $displayReturnto && $permissionManager->userCan(
2730                                 'read', $this->getUser(), $displayReturnto
2731                         ) ) {
2732                                 $this->returnToMain( null, $displayReturnto );
2733                         }
2734                 } else {
2735                         $this->prepareErrorPage( $this->msg( 'permissionserrors' ) );
2736                         $this->addWikiTextAsInterface( $this->formatPermissionsErrorMessage( $errors, $action ) );
2737                 }
2738         }
2739
2740         /**
2741          * Display an error page indicating that a given version of MediaWiki is
2742          * required to use it
2743          *
2744          * @param mixed $version The version of MediaWiki needed to use the page
2745          */
2746         public function versionRequired( $version ) {
2747                 $this->prepareErrorPage( $this->msg( 'versionrequired', $version ) );
2748
2749                 $this->addWikiMsg( 'versionrequiredtext', $version );
2750                 $this->returnToMain();
2751         }
2752
2753         /**
2754          * Format a list of error messages
2755          *
2756          * @param array $errors Array of arrays returned by Title::getUserPermissionsErrors
2757          * @param string|null $action Action that was denied or null if unknown
2758          * @return string The wikitext error-messages, formatted into a list.
2759          */
2760         public function formatPermissionsErrorMessage( array $errors, $action = null ) {
2761                 if ( $action == null ) {
2762                         $text = $this->msg( 'permissionserrorstext', count( $errors ) )->plain() . "\n\n";
2763                 } else {
2764                         $action_desc = $this->msg( "action-$action" )->plain();
2765                         $text = $this->msg(
2766                                 'permissionserrorstext-withaction',
2767                                 count( $errors ),
2768                                 $action_desc
2769                         )->plain() . "\n\n";
2770                 }
2771
2772                 if ( count( $errors ) > 1 ) {
2773                         $text .= '<ul class="permissions-errors">' . "\n";
2774
2775                         foreach ( $errors as $error ) {
2776                                 $text .= '<li>';
2777                                 $text .= $this->msg( ...$error )->plain();
2778                                 $text .= "</li>\n";
2779                         }
2780                         $text .= '</ul>';
2781                 } else {
2782                         $text .= "<div class=\"permissions-errors\">\n" .
2783                                         $this->msg( ...reset( $errors ) )->plain() .
2784                                         "\n</div>";
2785                 }
2786
2787                 return $text;
2788         }
2789
2790         /**
2791          * Show a warning about replica DB lag
2792          *
2793          * If the lag is higher than $wgSlaveLagCritical seconds,
2794          * then the warning is a bit more obvious. If the lag is
2795          * lower than $wgSlaveLagWarning, then no warning is shown.
2796          *
2797          * @param int $lag Replica lag
2798          */
2799         public function showLagWarning( $lag ) {
2800                 $config = $this->getConfig();
2801                 if ( $lag >= $config->get( 'SlaveLagWarning' ) ) {
2802                         $lag = floor( $lag ); // floor to avoid nano seconds to display
2803                         $message = $lag < $config->get( 'SlaveLagCritical' )
2804                                 ? 'lag-warn-normal'
2805                                 : 'lag-warn-high';
2806                         $wrap = Html::rawElement( 'div', [ 'class' => "mw-{$message}" ], "\n$1\n" );
2807                         $this->wrapWikiMsg( "$wrap\n", [ $message, $this->getLanguage()->formatNum( $lag ) ] );
2808                 }
2809         }
2810
2811         /**
2812          * Output an error page
2813          *
2814          * @note FatalError exception class provides an alternative.
2815          * @param string $message Error to output. Must be escaped for HTML.
2816          */
2817         public function showFatalError( $message ) {
2818                 $this->prepareErrorPage( $this->msg( 'internalerror' ) );
2819
2820                 $this->addHTML( $message );
2821         }
2822
2823         /**
2824          * Add a "return to" link pointing to a specified title
2825          *
2826          * @param LinkTarget $title Title to link
2827          * @param array $query Query string parameters
2828          * @param string|null $text Text of the link (input is not escaped)
2829          * @param array $options Options array to pass to Linker
2830          */
2831         public function addReturnTo( $title, array $query = [], $text = null, $options = [] ) {
2832                 $linkRenderer = MediaWikiServices::getInstance()
2833                         ->getLinkRendererFactory()->createFromLegacyOptions( $options );
2834                 $link = $this->msg( 'returnto' )->rawParams(
2835                         $linkRenderer->makeLink( $title, $text, [], $query ) )->escaped();
2836                 $this->addHTML( "<p id=\"mw-returnto\">{$link}</p>\n" );
2837         }
2838
2839         /**
2840          * Add a "return to" link pointing to a specified title,
2841          * or the title indicated in the request, or else the main page
2842          *
2843          * @param mixed|null $unused
2844          * @param Title|string|null $returnto Title or String to return to
2845          * @param string|null $returntoquery Query string for the return to link
2846          */
2847         public function returnToMain( $unused = null, $returnto = null, $returntoquery = null ) {
2848                 if ( $returnto == null ) {
2849                         $returnto = $this->getRequest()->getText( 'returnto' );
2850                 }
2851
2852                 if ( $returntoquery == null ) {
2853                         $returntoquery = $this->getRequest()->getText( 'returntoquery' );
2854                 }
2855
2856                 if ( $returnto === '' ) {
2857                         $returnto = Title::newMainPage();
2858                 }
2859
2860                 if ( is_object( $returnto ) ) {
2861                         $titleObj = $returnto;
2862                 } else {
2863                         $titleObj = Title::newFromText( $returnto );
2864                 }
2865                 // We don't want people to return to external interwiki. That
2866                 // might potentially be used as part of a phishing scheme
2867                 if ( !is_object( $titleObj ) || $titleObj->isExternal() ) {
2868                         $titleObj = Title::newMainPage();
2869                 }
2870
2871                 $this->addReturnTo( $titleObj, wfCgiToArray( $returntoquery ) );
2872         }
2873
2874         private function getRlClientContext() {
2875                 if ( !$this->rlClientContext ) {
2876                         $query = ResourceLoader::makeLoaderQuery(
2877                                 [], // modules; not relevant
2878                                 $this->getLanguage()->getCode(),
2879                                 $this->getSkin()->getSkinName(),
2880                                 $this->getUser()->isLoggedIn() ? $this->getUser()->getName() : null,
2881                                 null, // version; not relevant
2882                                 ResourceLoader::inDebugMode(),
2883                                 null, // only; not relevant
2884                                 $this->isPrintable(),
2885                                 $this->getRequest()->getBool( 'handheld' )
2886                         );
2887                         $this->rlClientContext = new ResourceLoaderContext(
2888                                 $this->getResourceLoader(),
2889                                 new FauxRequest( $query )
2890                         );
2891                         if ( $this->contentOverrideCallbacks ) {
2892                                 $this->rlClientContext = new DerivativeResourceLoaderContext( $this->rlClientContext );
2893                                 $this->rlClientContext->setContentOverrideCallback( function ( Title $title ) {
2894                                         foreach ( $this->contentOverrideCallbacks as $callback ) {
2895                                                 $content = $callback( $title );
2896                                                 if ( $content !== null ) {
2897                                                         $text = ContentHandler::getContentText( $content );
2898                                                         if ( strpos( $text, '</script>' ) !== false ) {
2899                                                                 // Proactively replace this so that we can display a message
2900                                                                 // to the user, instead of letting it go to Html::inlineScript(),
2901                                                                 // where it would be considered a server-side issue.
2902                                                                 $titleFormatted = $title->getPrefixedText();
2903                                                                 $content = new JavaScriptContent(
2904                                                                         Xml::encodeJsCall( 'mw.log.error', [
2905                                                                                 "Cannot preview $titleFormatted due to script-closing tag."
2906                                                                         ] )
2907                                                                 );
2908                                                         }
2909                                                         return $content;
2910                                                 }
2911                                         }
2912                                         return null;
2913                                 } );
2914                         }
2915                 }
2916                 return $this->rlClientContext;
2917         }
2918
2919         /**
2920          * Call this to freeze the module queue and JS config and create a formatter.
2921          *
2922          * Depending on the Skin, this may get lazy-initialised in either headElement() or
2923          * getBottomScripts(). See SkinTemplate::prepareQuickTemplate(). Calling this too early may
2924          * cause unexpected side-effects since disallowUserJs() may be called at any time to change
2925          * the module filters retroactively. Skins and extension hooks may also add modules until very
2926          * late in the request lifecycle.
2927          *
2928          * @return ResourceLoaderClientHtml
2929          */
2930         public function getRlClient() {
2931                 if ( !$this->rlClient ) {
2932                         $context = $this->getRlClientContext();
2933                         $rl = $this->getResourceLoader();
2934                         $this->addModules( [
2935                                 'user',
2936                                 'user.options',
2937                                 'user.tokens',
2938                         ] );
2939                         $this->addModuleStyles( [
2940                                 'site.styles',
2941                                 'noscript',
2942                                 'user.styles',
2943                         ] );
2944                         $this->getSkin()->setupSkinUserCss( $this );
2945
2946                         // Prepare exempt modules for buildExemptModules()
2947                         $exemptGroups = [ 'site' => [], 'noscript' => [], 'private' => [], 'user' => [] ];
2948                         $exemptStates = [];
2949                         $moduleStyles = $this->getModuleStyles( /*filter*/ true );
2950
2951                         // Preload getTitleInfo for isKnownEmpty calls below and in ResourceLoaderClientHtml
2952                         // Separate user-specific batch for improved cache-hit ratio.
2953                         $userBatch = [ 'user.styles', 'user' ];
2954                         $siteBatch = array_diff( $moduleStyles, $userBatch );
2955                         $dbr = wfGetDB( DB_REPLICA );
2956                         ResourceLoaderWikiModule::preloadTitleInfo( $context, $dbr, $siteBatch );
2957                         ResourceLoaderWikiModule::preloadTitleInfo( $context, $dbr, $userBatch );
2958
2959                         // Filter out modules handled by buildExemptModules()
2960                         $moduleStyles = array_filter( $moduleStyles,
2961                                 function ( $name ) use ( $rl, $context, &$exemptGroups, &$exemptStates ) {
2962                                         $module = $rl->getModule( $name );
2963                                         if ( $module ) {
2964                                                 $group = $module->getGroup();
2965                                                 if ( isset( $exemptGroups[$group] ) ) {
2966                                                         $exemptStates[$name] = 'ready';
2967                                                         if ( !$module->isKnownEmpty( $context ) ) {
2968                                                                 // E.g. Don't output empty <styles>
2969                                                                 $exemptGroups[$group][] = $name;
2970                                                         }
2971                                                         return false;
2972                                                 }
2973                                         }
2974                                         return true;
2975                                 }
2976                         );
2977                         $this->rlExemptStyleModules = $exemptGroups;
2978
2979                         $rlClient = new ResourceLoaderClientHtml( $context, [
2980                                 'target' => $this->getTarget(),
2981                                 'nonce' => $this->getCSPNonce(),
2982                                 // When 'safemode', disallowUserJs(), or reduceAllowedModules() is used
2983                                 // to only restrict modules to ORIGIN_CORE (ie. disallow ORIGIN_USER), the list of
2984                                 // modules enqueud for loading on this page is filtered to just those.
2985                                 // However, to make sure we also apply the restriction to dynamic dependencies and
2986                                 // lazy-loaded modules at run-time on the client-side, pass 'safemode' down to the
2987                                 // StartupModule so that the client-side registry will not contain any restricted
2988                                 // modules either. (T152169, T185303)
2989                                 'safemode' => ( $this->getAllowedModules( ResourceLoaderModule::TYPE_COMBINED )
2990                                         <= ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL
2991                                 ) ? '1' : null,
2992                         ] );
2993                         $rlClient->setConfig( $this->getJSVars() );
2994                         $rlClient->setModules( $this->getModules( /*filter*/ true ) );
2995                         $rlClient->setModuleStyles( $moduleStyles );
2996                         $rlClient->setExemptStates( $exemptStates );
2997                         $this->rlClient = $rlClient;
2998                 }
2999                 return $this->rlClient;
3000         }
3001
3002         /**
3003          * @param Skin $sk The given Skin
3004          * @param bool $includeStyle Unused
3005          * @return string The doctype, opening "<html>", and head element.
3006          */
3007         public function headElement( Skin $sk, $includeStyle = true ) {
3008                 $config = $this->getConfig();
3009                 $userdir = $this->getLanguage()->getDir();
3010                 $sitedir = MediaWikiServices::getInstance()->getContentLanguage()->getDir();
3011
3012                 $pieces = [];
3013                 $htmlAttribs = Sanitizer::mergeAttributes(
3014                         $this->getRlClient()->getDocumentAttributes(),
3015                         $sk->getHtmlElementAttributes()
3016                 );
3017                 $pieces[] = Html::htmlHeader( $htmlAttribs );
3018                 $pieces[] = Html::openElement( 'head' );
3019
3020                 if ( $this->getHTMLTitle() == '' ) {
3021                         $this->setHTMLTitle( $this->msg( 'pagetitle', $this->getPageTitle() )->inContentLanguage() );
3022                 }
3023
3024                 if ( !Html::isXmlMimeType( $config->get( 'MimeType' ) ) ) {
3025                         // Add <meta charset="UTF-8">
3026                         // This should be before <title> since it defines the charset used by
3027                         // text including the text inside <title>.
3028                         // The spec recommends defining XHTML5's charset using the XML declaration
3029                         // instead of meta.
3030                         // Our XML declaration is output by Html::htmlHeader.
3031                         // https://html.spec.whatwg.org/multipage/semantics.html#attr-meta-http-equiv-content-type
3032                         // https://html.spec.whatwg.org/multipage/semantics.html#charset
3033                         $pieces[] = Html::element( 'meta', [ 'charset' => 'UTF-8' ] );
3034                 }
3035
3036                 $pieces[] = Html::element( 'title', null, $this->getHTMLTitle() );
3037                 $pieces[] = $this->getRlClient()->getHeadHtml( $htmlAttribs['class'] ?? null );
3038                 $pieces[] = $this->buildExemptModules();
3039                 $pieces = array_merge( $pieces, array_values( $this->getHeadLinksArray() ) );
3040                 $pieces = array_merge( $pieces, array_values( $this->mHeadItems ) );
3041
3042                 // This library is intended to run on older browsers that MediaWiki no longer
3043                 // supports as Grade A. For these Grade C browsers, we provide an experience
3044                 // using only HTML and CSS. But, where standards-compliant browsers are able to
3045                 // style unknown HTML elements without issue, old IE ignores these styles.
3046                 // The html5shiv library fixes that.
3047                 // Use an IE conditional comment to serve the script only to old IE
3048                 $shivUrl = $config->get( 'ResourceBasePath' ) . '/resources/lib/html5shiv/html5shiv.js';
3049                 $pieces[] = '<!--[if lt IE 9]>' .
3050                         Html::linkedScript( $shivUrl, $this->getCSPNonce() ) .
3051                         '<![endif]-->';
3052
3053                 $pieces[] = Html::closeElement( 'head' );
3054
3055                 $bodyClasses = $this->mAdditionalBodyClasses;
3056                 $bodyClasses[] = 'mediawiki';
3057
3058                 # Classes for LTR/RTL directionality support
3059                 $bodyClasses[] = $userdir;
3060                 $bodyClasses[] = "sitedir-$sitedir";
3061
3062                 $underline = $this->getUser()->getOption( 'underline' );
3063                 if ( $underline < 2 ) {
3064                         // The following classes can be used here:
3065                         // * mw-underline-always
3066                         // * mw-underline-never
3067                         $bodyClasses[] = 'mw-underline-' . ( $underline ? 'always' : 'never' );
3068                 }
3069
3070                 if ( $this->getLanguage()->capitalizeAllNouns() ) {
3071                         # A <body> class is probably not the best way to do this . . .
3072                         $bodyClasses[] = 'capitalize-all-nouns';
3073                 }
3074
3075                 // Parser feature migration class
3076                 // The idea is that this will eventually be removed, after the wikitext
3077                 // which requires it is cleaned up.
3078                 $bodyClasses[] = 'mw-hide-empty-elt';
3079
3080                 $bodyClasses[] = $sk->getPageClasses( $this->getTitle() );
3081                 $bodyClasses[] = 'skin-' . Sanitizer::escapeClass( $sk->getSkinName() );
3082                 $bodyClasses[] =
3083                         'action-' . Sanitizer::escapeClass( Action::getActionName( $this->getContext() ) );
3084
3085                 $bodyAttrs = [];
3086                 // While the implode() is not strictly needed, it's used for backwards compatibility
3087                 // (this used to be built as a string and hooks likely still expect that).
3088                 $bodyAttrs['class'] = implode( ' ', $bodyClasses );
3089
3090                 // Allow skins and extensions to add body attributes they need
3091                 $sk->addToBodyAttributes( $this, $bodyAttrs );
3092                 Hooks::run( 'OutputPageBodyAttributes', [ $this, $sk, &$bodyAttrs ] );
3093
3094                 $pieces[] = Html::openElement( 'body', $bodyAttrs );
3095
3096                 return self::combineWrappedStrings( $pieces );
3097         }
3098
3099         /**
3100          * Get a ResourceLoader object associated with this OutputPage
3101          *
3102          * @return ResourceLoader
3103          */
3104         public function getResourceLoader() {
3105                 if ( is_null( $this->mResourceLoader ) ) {
3106                         // Lazy-initialise as needed
3107                         $this->mResourceLoader = MediaWikiServices::getInstance()->getResourceLoader();
3108                 }
3109                 return $this->mResourceLoader;
3110         }
3111
3112         /**
3113          * Explicily load or embed modules on a page.
3114          *
3115          * @param array|string $modules One or more module names
3116          * @param string $only ResourceLoaderModule TYPE_ class constant
3117          * @param array $extraQuery [optional] Array with extra query parameters for the request
3118          * @return string|WrappedStringList HTML
3119          */
3120         public function makeResourceLoaderLink( $modules, $only, array $extraQuery = [] ) {
3121                 // Apply 'target' and 'origin' filters
3122                 $modules = $this->filterModules( (array)$modules, null, $only );
3123
3124                 return ResourceLoaderClientHtml::makeLoad(
3125                         $this->getRlClientContext(),
3126                         $modules,
3127                         $only,
3128                         $extraQuery,
3129                         $this->getCSPNonce()
3130                 );
3131         }
3132
3133         /**
3134          * Combine WrappedString chunks and filter out empty ones
3135          *
3136          * @param array $chunks
3137          * @return string|WrappedStringList HTML
3138          */
3139         protected static function combineWrappedStrings( array $chunks ) {
3140                 // Filter out empty values
3141                 $chunks = array_filter( $chunks, 'strlen' );
3142                 return WrappedString::join( "\n", $chunks );
3143         }
3144
3145         /**
3146          * JS stuff to put at the bottom of the `<body>`.
3147          * These are legacy scripts ($this->mScripts), and user JS.
3148          *
3149          * @return string|WrappedStringList HTML
3150          */
3151         public function getBottomScripts() {
3152                 $chunks = [];
3153                 $chunks[] = $this->getRlClient()->getBodyHtml();
3154
3155                 // Legacy non-ResourceLoader scripts
3156                 $chunks[] = $this->mScripts;
3157
3158                 if ( $this->limitReportJSData ) {
3159                         $chunks[] = ResourceLoader::makeInlineScript(
3160                                 ResourceLoader::makeConfigSetScript(
3161                                         [ 'wgPageParseReport' => $this->limitReportJSData ]
3162                                 ),
3163                                 $this->getCSPNonce()
3164                         );
3165                 }
3166
3167                 return self::combineWrappedStrings( $chunks );
3168         }
3169
3170         /**
3171          * Get the javascript config vars to include on this page
3172          *
3173          * @return array Array of javascript config vars
3174          * @since 1.23
3175          */
3176         public function getJsConfigVars() {
3177                 return $this->mJsConfigVars;
3178         }
3179
3180         /**
3181          * Add one or more variables to be set in mw.config in JavaScript
3182          *
3183          * @param string|array $keys Key or array of key/value pairs
3184          * @param mixed|null $value [optional] Value of the configuration variable
3185          */
3186         public function addJsConfigVars( $keys, $value = null ) {
3187                 if ( is_array( $keys ) ) {
3188                         foreach ( $keys as $key => $value ) {
3189                                 $this->mJsConfigVars[$key] = $value;
3190                         }
3191                         return;
3192                 }
3193
3194                 $this->mJsConfigVars[$keys] = $value;
3195         }
3196
3197         /**
3198          * Get an array containing the variables to be set in mw.config in JavaScript.
3199          *
3200          * Do not add things here which can be evaluated in ResourceLoaderStartUpModule
3201          * - in other words, page-independent/site-wide variables (without state).
3202          * You will only be adding bloat to the html page and causing page caches to
3203          * have to be purged on configuration changes.
3204          * @return array
3205          */
3206         public function getJSVars() {
3207                 $curRevisionId = 0;
3208                 $articleId = 0;
3209                 $canonicalSpecialPageName = false; # T23115
3210                 $services = MediaWikiServices::getInstance();
3211
3212                 $title = $this->getTitle();
3213                 $ns = $title->getNamespace();
3214                 $nsInfo = $services->getNamespaceInfo();
3215                 $canonicalNamespace = $nsInfo->exists( $ns )
3216                         ? $nsInfo->getCanonicalName( $ns )
3217                         : $title->getNsText();
3218
3219                 $sk = $this->getSkin();
3220                 // Get the relevant title so that AJAX features can use the correct page name
3221                 // when making API requests from certain special pages (T36972).
3222                 $relevantTitle = $sk->getRelevantTitle();
3223                 $relevantUser = $sk->getRelevantUser();
3224
3225                 if ( $ns == NS_SPECIAL ) {
3226                         list( $canonicalSpecialPageName, /*...*/ ) =
3227                                 $services->getSpecialPageFactory()->
3228                                         resolveAlias( $title->getDBkey() );
3229                 } elseif ( $this->canUseWikiPage() ) {
3230                         $wikiPage = $this->getWikiPage();
3231                         $curRevisionId = $wikiPage->getLatest();
3232                         $articleId = $wikiPage->getId();
3233                 }
3234
3235                 $lang = $title->getPageViewLanguage();
3236
3237                 // Pre-process information
3238                 $separatorTransTable = $lang->separatorTransformTable();
3239                 $separatorTransTable = $separatorTransTable ?: [];
3240                 $compactSeparatorTransTable = [
3241                         implode( "\t", array_keys( $separatorTransTable ) ),
3242                         implode( "\t", $separatorTransTable ),
3243                 ];
3244                 $digitTransTable = $lang->digitTransformTable();
3245                 $digitTransTable = $digitTransTable ?: [];
3246                 $compactDigitTransTable = [
3247                         implode( "\t", array_keys( $digitTransTable ) ),
3248                         implode( "\t", $digitTransTable ),
3249                 ];
3250
3251                 $user = $this->getUser();
3252
3253                 $vars = [
3254                         'wgCanonicalNamespace' => $canonicalNamespace,
3255                         'wgCanonicalSpecialPageName' => $canonicalSpecialPageName,
3256                         'wgNamespaceNumber' => $title->getNamespace(),
3257                         'wgPageName' => $title->getPrefixedDBkey(),
3258                         'wgTitle' => $title->getText(),
3259                         'wgCurRevisionId' => $curRevisionId,
3260                         'wgRevisionId' => (int)$this->getRevisionId(),
3261                         'wgArticleId' => $articleId,
3262                         'wgIsArticle' => $this->isArticle(),
3263                         'wgIsRedirect' => $title->isRedirect(),
3264                         'wgAction' => Action::getActionName( $this->getContext() ),
3265                         'wgUserName' => $user->isAnon() ? null : $user->getName(),
3266                         'wgUserGroups' => $user->getEffectiveGroups(),
3267                         'wgCategories' => $this->getCategories(),
3268                         'wgBreakFrames' => $this->getFrameOptions() == 'DENY',
3269                         'wgPageContentLanguage' => $lang->getCode(),
3270                         'wgPageContentModel' => $title->getContentModel(),
3271                         'wgSeparatorTransformTable' => $compactSeparatorTransTable,
3272                         'wgDigitTransformTable' => $compactDigitTransTable,
3273                         'wgDefaultDateFormat' => $lang->getDefaultDateFormat(),
3274                         'wgMonthNames' => $lang->getMonthNamesArray(),
3275                         'wgMonthNamesShort' => $lang->getMonthAbbreviationsArray(),
3276                         'wgRelevantPageName' => $relevantTitle->getPrefixedDBkey(),
3277                         'wgRelevantArticleId' => $relevantTitle->getArticleID(),
3278                         'wgRequestId' => WebRequest::getRequestId(),
3279                         'wgCSPNonce' => $this->getCSPNonce(),
3280                 ];
3281
3282                 if ( $user->isLoggedIn() ) {
3283                         $vars['wgUserId'] = $user->getId();
3284                         $vars['wgUserEditCount'] = $user->getEditCount();
3285                         $userReg = $user->getRegistration();
3286                         $vars['wgUserRegistration'] = $userReg ? wfTimestamp( TS_UNIX, $userReg ) * 1000 : null;
3287                         // Get the revision ID of the oldest new message on the user's talk
3288                         // page. This can be used for constructing new message alerts on
3289                         // the client side.
3290                         $vars['wgUserNewMsgRevisionId'] = $user->getNewMessageRevisionId();
3291                 }
3292
3293                 $contLang = $services->getContentLanguage();
3294                 if ( $contLang->hasVariants() ) {
3295                         $vars['wgUserVariant'] = $contLang->getPreferredVariant();
3296                 }
3297                 // Same test as SkinTemplate
3298                 $vars['wgIsProbablyEditable'] = $this->userCanEditOrCreate( $user, $title );
3299
3300                 $vars['wgRelevantPageIsProbablyEditable'] = $relevantTitle &&
3301                         $this->userCanEditOrCreate( $user, $relevantTitle );
3302
3303                 foreach ( $title->getRestrictionTypes() as $type ) {
3304                         // Following keys are set in $vars:
3305                         // wgRestrictionCreate, wgRestrictionEdit, wgRestrictionMove, wgRestrictionUpload
3306                         $vars['wgRestriction' . ucfirst( $type )] = $title->getRestrictions( $type );
3307                 }
3308
3309                 if ( $title->isMainPage() ) {
3310                         $vars['wgIsMainPage'] = true;
3311                 }
3312
3313                 if ( $this->mRedirectedFrom ) {
3314                         $vars['wgRedirectedFrom'] = $this->mRedirectedFrom->getPrefixedDBkey();
3315                 }
3316
3317                 if ( $relevantUser ) {
3318                         $vars['wgRelevantUserName'] = $relevantUser->getName();
3319                 }
3320
3321                 // Allow extensions to add their custom variables to the mw.config map.
3322                 // Use the 'ResourceLoaderGetConfigVars' hook if the variable is not
3323                 // page-dependant but site-wide (without state).
3324                 // Alternatively, you may want to use OutputPage->addJsConfigVars() instead.
3325                 Hooks::run( 'MakeGlobalVariablesScript', [ &$vars, $this ] );
3326
3327                 // Merge in variables from addJsConfigVars last
3328                 return array_merge( $vars, $this->getJsConfigVars() );
3329         }
3330
3331         /**
3332          * To make it harder for someone to slip a user a fake
3333          * JavaScript or CSS preview, a random token
3334          * is associated with the login session. If it's not
3335          * passed back with the preview request, we won't render
3336          * the code.
3337          *
3338          * @return bool
3339          */
3340         public function userCanPreview() {
3341                 $request = $this->getRequest();
3342                 if (
3343                         $request->getVal( 'action' ) !== 'submit' ||
3344                         !$request->wasPosted()
3345                 ) {
3346                         return false;
3347                 }
3348
3349                 $user = $this->getUser();
3350
3351                 if ( !$user->isLoggedIn() ) {
3352                         // Anons have predictable edit tokens
3353                         return false;
3354                 }
3355                 if ( !$user->matchEditToken( $request->getVal( 'wpEditToken' ) ) ) {
3356                         return false;
3357                 }
3358
3359                 $title = $this->getTitle();
3360                 $errors = $title->getUserPermissionsErrors( 'edit', $user );
3361                 if ( count( $errors ) !== 0 ) {
3362                         return false;
3363                 }
3364
3365                 return true;
3366         }
3367
3368         /**
3369          * @param User $user
3370          * @param LinkTarget $title
3371          * @return bool
3372          */
3373         private function userCanEditOrCreate(
3374                 User $user,
3375                 LinkTarget $title
3376         ) {
3377                 $pm = MediaWikiServices::getInstance()->getPermissionManager();
3378                 return $pm->quickUserCan( 'edit', $user, $title )
3379                 && ( $this->getTitle()->exists() ||
3380                          $pm->quickUserCan( 'create', $user, $title ) );
3381         }
3382
3383         /**
3384          * @return array Array in format "link name or number => 'link html'".
3385          */
3386         public function getHeadLinksArray() {
3387                 global $wgVersion;
3388
3389                 $tags = [];
3390                 $config = $this->getConfig();
3391
3392                 $canonicalUrl = $this->mCanonicalUrl;
3393
3394                 $tags['meta-generator'] = Html::element( 'meta', [
3395                         'name' => 'generator',
3396                         'content' => "MediaWiki $wgVersion",
3397                 ] );
3398
3399                 if ( $config->get( 'ReferrerPolicy' ) !== false ) {
3400                         // Per https://w3c.github.io/webappsec-referrer-policy/#unknown-policy-values
3401                         // fallbacks should come before the primary value so we need to reverse the array.
3402                         foreach ( array_reverse( (array)$config->get( 'ReferrerPolicy' ) ) as $i => $policy ) {
3403                                 $tags["meta-referrer-$i"] = Html::element( 'meta', [
3404                                         'name' => 'referrer',
3405                                         'content' => $policy,
3406                                 ] );
3407                         }
3408                 }
3409
3410                 $p = "{$this->mIndexPolicy},{$this->mFollowPolicy}";
3411                 if ( $p !== 'index,follow' ) {
3412                         // http://www.robotstxt.org/wc/meta-user.html
3413                         // Only show if it's different from the default robots policy
3414                         $tags['meta-robots'] = Html::element( 'meta', [
3415                                 'name' => 'robots',
3416                                 'content' => $p,
3417                         ] );
3418                 }
3419
3420                 foreach ( $this->mMetatags as $tag ) {
3421                         if ( strncasecmp( $tag[0], 'http:', 5 ) === 0 ) {
3422                                 $a = 'http-equiv';
3423                                 $tag[0] = substr( $tag[0], 5 );
3424                         } elseif ( strncasecmp( $tag[0], 'og:', 3 ) === 0 ) {
3425                                 $a = 'property';
3426                         } else {
3427                                 $a = 'name';
3428                         }
3429                         $tagName = "meta-{$tag[0]}";
3430                         if ( isset( $tags[$tagName] ) ) {
3431                                 $tagName .= $tag[1];
3432                         }
3433                         $tags[$tagName] = Html::element( 'meta',
3434                                 [
3435                                         $a => $tag[0],
3436                                         'content' => $tag[1]
3437                                 ]
3438                         );
3439                 }
3440
3441                 foreach ( $this->mLinktags as $tag ) {
3442                         $tags[] = Html::element( 'link', $tag );
3443                 }
3444
3445                 # Universal edit button
3446                 if ( $config->get( 'UniversalEditButton' ) && $this->isArticleRelated() ) {
3447                         if ( $this->userCanEditOrCreate( $this->getUser(), $this->getTitle() ) ) {
3448                                 // Original UniversalEditButton
3449                                 $msg = $this->msg( 'edit' )->text();
3450                                 $tags['universal-edit-button'] = Html::element( 'link', [
3451                                         'rel' => 'alternate',
3452                                         'type' => 'application/x-wiki',
3453                                         'title' => $msg,
3454                                         'href' => $this->getTitle()->getEditURL(),
3455                                 ] );
3456                                 // Alternate edit link
3457                                 $tags['alternative-edit'] = Html::element( 'link', [
3458                                         'rel' => 'edit',
3459                                         'title' => $msg,
3460                                         'href' => $this->getTitle()->getEditURL(),
3461                                 ] );
3462                         }
3463                 }
3464
3465                 # Generally the order of the favicon and apple-touch-icon links
3466                 # should not matter, but Konqueror (3.5.9 at least) incorrectly
3467                 # uses whichever one appears later in the HTML source. Make sure
3468                 # apple-touch-icon is specified first to avoid this.
3469                 if ( $config->get( 'AppleTouchIcon' ) !== false ) {
3470                         $tags['apple-touch-icon'] = Html::element( 'link', [
3471                                 'rel' => 'apple-touch-icon',
3472                                 'href' => $config->get( 'AppleTouchIcon' )
3473                         ] );
3474                 }
3475
3476                 if ( $config->get( 'Favicon' ) !== false ) {
3477                         $tags['favicon'] = Html::element( 'link', [
3478                                 'rel' => 'shortcut icon',
3479                                 'href' => $config->get( 'Favicon' )
3480                         ] );
3481                 }
3482
3483                 # OpenSearch description link
3484                 $tags['opensearch'] = Html::element( 'link', [
3485                         'rel' => 'search',
3486                         'type' => 'application/opensearchdescription+xml',
3487                         'href' => wfScript( 'opensearch_desc' ),
3488                         'title' => $this->msg( 'opensearch-desc' )->inContentLanguage()->text(),
3489                 ] );
3490
3491                 # Real Simple Discovery link, provides auto-discovery information
3492                 # for the MediaWiki API (and potentially additional custom API
3493                 # support such as WordPress or Twitter-compatible APIs for a
3494                 # blogging extension, etc)
3495                 $tags['rsd'] = Html::element( 'link', [
3496                         'rel' => 'EditURI',
3497                         'type' => 'application/rsd+xml',
3498                         // Output a protocol-relative URL here if $wgServer is protocol-relative.
3499                         // Whether RSD accepts relative or protocol-relative URLs is completely
3500                         // undocumented, though.
3501                         'href' => wfExpandUrl( wfAppendQuery(
3502                                 wfScript( 'api' ),
3503                                 [ 'action' => 'rsd' ] ),
3504                                 PROTO_RELATIVE
3505                         ),
3506                 ] );
3507
3508                 # Language variants
3509                 if ( !$config->get( 'DisableLangConversion' ) ) {
3510                         $lang = $this->getTitle()->getPageLanguage();
3511                         if ( $lang->hasVariants() ) {
3512                                 $variants = $lang->getVariants();
3513                                 foreach ( $variants as $variant ) {
3514                                         $tags["variant-$variant"] = Html::element( 'link', [
3515                                                 'rel' => 'alternate',
3516                                                 'hreflang' => LanguageCode::bcp47( $variant ),
3517                                                 'href' => $this->getTitle()->getLocalURL(
3518                                                         [ 'variant' => $variant ] )
3519                                                 ]
3520                                         );
3521                                 }
3522                                 # x-default link per https://support.google.com/webmasters/answer/189077?hl=en
3523                                 $tags["variant-x-default"] = Html::element( 'link', [
3524                                         'rel' => 'alternate',
3525                                         'hreflang' => 'x-default',
3526                                         'href' => $this->getTitle()->getLocalURL() ] );
3527                         }
3528                 }
3529
3530                 # Copyright
3531                 if ( $this->copyrightUrl !== null ) {
3532                         $copyright = $this->copyrightUrl;
3533                 } else {
3534                         $copyright = '';
3535                         if ( $config->get( 'RightsPage' ) ) {
3536                                 $copy = Title::newFromText( $config->get( 'RightsPage' ) );
3537
3538                                 if ( $copy ) {
3539                                         $copyright = $copy->getLocalURL();
3540                                 }
3541                         }
3542
3543                         if ( !$copyright && $config->get( 'RightsUrl' ) ) {
3544                                 $copyright = $config->get( 'RightsUrl' );
3545                         }
3546                 }
3547
3548                 if ( $copyright ) {
3549                         $tags['copyright'] = Html::element( 'link', [
3550                                 'rel' => 'license',
3551                                 'href' => $copyright ]
3552                         );
3553                 }
3554
3555                 # Feeds
3556                 if ( $config->get( 'Feed' ) ) {
3557                         $feedLinks = [];
3558
3559                         foreach ( $this->getSyndicationLinks() as $format => $link ) {
3560                                 # Use the page name for the title.  In principle, this could
3561                                 # lead to issues with having the same name for different feeds
3562                                 # corresponding to the same page, but we can't avoid that at
3563                                 # this low a level.
3564
3565                                 $feedLinks[] = $this->feedLink(
3566                                         $format,
3567                                         $link,
3568                                         # Used messages: 'page-rss-feed' and 'page-atom-feed' (for an easier grep)
3569                                         $this->msg(
3570                                                 "page-{$format}-feed", $this->getTitle()->getPrefixedText()
3571                                         )->text()
3572                                 );
3573                         }
3574
3575                         # Recent changes feed should appear on every page (except recentchanges,
3576                         # that would be redundant). Put it after the per-page feed to avoid
3577                         # changing existing behavior. It's still available, probably via a
3578                         # menu in your browser. Some sites might have a different feed they'd
3579                         # like to promote instead of the RC feed (maybe like a "Recent New Articles"
3580                         # or "Breaking news" one). For this, we see if $wgOverrideSiteFeed is defined.
3581                         # If so, use it instead.
3582                         $sitename = $config->get( 'Sitename' );
3583                         $overrideSiteFeed = $config->get( 'OverrideSiteFeed' );
3584                         if ( $overrideSiteFeed ) {
3585                                 foreach ( $overrideSiteFeed as $type => $feedUrl ) {
3586                                         // Note, this->feedLink escapes the url.
3587                                         $feedLinks[] = $this->feedLink(
3588                                                 $type,
3589                                                 $feedUrl,
3590                                                 $this->msg( "site-{$type}-feed", $sitename )->text()
3591                                         );
3592                                 }
3593                         } elseif ( !$this->getTitle()->isSpecial( 'Recentchanges' ) ) {
3594                                 $rctitle = SpecialPage::getTitleFor( 'Recentchanges' );
3595                                 foreach ( $this->getAdvertisedFeedTypes() as $format ) {
3596                                         $feedLinks[] = $this->feedLink(
3597                                                 $format,
3598                                                 $rctitle->getLocalURL( [ 'feed' => $format ] ),
3599                                                 # For grep: 'site-rss-feed', 'site-atom-feed'
3600                                                 $this->msg( "site-{$format}-feed", $sitename )->text()
3601                                         );
3602                                 }
3603                         }
3604
3605                         # Allow extensions to change the list pf feeds. This hook is primarily for changing,
3606                         # manipulating or removing existing feed tags. If you want to add new feeds, you should
3607                         # use OutputPage::addFeedLink() instead.
3608                         Hooks::run( 'AfterBuildFeedLinks', [ &$feedLinks ] );
3609
3610                         $tags += $feedLinks;
3611                 }
3612
3613                 # Canonical URL
3614                 if ( $config->get( 'EnableCanonicalServerLink' ) ) {
3615                         if ( $canonicalUrl !== false ) {
3616                                 $canonicalUrl = wfExpandUrl( $canonicalUrl, PROTO_CANONICAL );
3617                         } elseif ( $this->isArticleRelated() ) {
3618                                 // This affects all requests where "setArticleRelated" is true. This is
3619                                 // typically all requests that show content (query title, curid, oldid, diff),
3620                                 // and all wikipage actions (edit, delete, purge, info, history etc.).
3621                                 // It does not apply to File pages and Special pages.
3622                                 // 'history' and 'info' actions address page metadata rather than the page
3623                                 // content itself, so they may not be canonicalized to the view page url.
3624                                 // TODO: this ought to be better encapsulated in the Action class.
3625                                 $action = Action::getActionName( $this->getContext() );
3626                                 if ( in_array( $action, [ 'history', 'info' ] ) ) {
3627                                         $query = "action={$action}";
3628                                 } else {
3629                                         $query = '';
3630                                 }
3631                                 $canonicalUrl = $this->getTitle()->getCanonicalURL( $query );
3632                         } else {
3633                                 $reqUrl = $this->getRequest()->getRequestURL();
3634                                 $canonicalUrl = wfExpandUrl( $reqUrl, PROTO_CANONICAL );
3635                         }
3636                 }
3637                 if ( $canonicalUrl !== false ) {
3638                         $tags[] = Html::element( 'link', [
3639                                 'rel' => 'canonical',
3640                                 'href' => $canonicalUrl
3641                         ] );
3642                 }
3643
3644                 // Allow extensions to add, remove and/or otherwise manipulate these links
3645                 // If you want only to *add* <head> links, please use the addHeadItem()
3646                 // (or addHeadItems() for multiple items) method instead.
3647                 // This hook is provided as a last resort for extensions to modify these
3648                 // links before the output is sent to client.
3649                 Hooks::run( 'OutputPageAfterGetHeadLinksArray', [ &$tags, $this ] );
3650
3651                 return $tags;
3652         }
3653
3654         /**
3655          * Generate a "<link rel/>" for a feed.
3656          *
3657          * @param string $type Feed type
3658          * @param string $url URL to the feed
3659          * @param string $text Value of the "title" attribute
3660          * @return string HTML fragment
3661          */
3662         private function feedLink( $type, $url, $text ) {
3663                 return Html::element( 'link', [
3664                         'rel' => 'alternate',
3665                         'type' => "application/$type+xml",
3666                         'title' => $text,
3667                         'href' => $url ]
3668                 );
3669         }
3670
3671         /**
3672          * Add a local or specified stylesheet, with the given media options.
3673          * Internal use only. Use OutputPage::addModuleStyles() if possible.
3674          *
3675          * @param string $style URL to the file
3676          * @param string $media To specify a media type, 'screen', 'printable', 'handheld' or any.
3677          * @param string $condition For IE conditional comments, specifying an IE version
3678          * @param string $dir Set to 'rtl' or 'ltr' for direction-specific sheets
3679          */
3680         public function addStyle( $style, $media = '', $condition = '', $dir = '' ) {
3681                 $options = [];
3682                 if ( $media ) {
3683                         $options['media'] = $media;
3684                 }
3685                 if ( $condition ) {
3686                         $options['condition'] = $condition;
3687                 }
3688                 if ( $dir ) {
3689                         $options['dir'] = $dir;
3690                 }
3691                 $this->styles[$style] = $options;
3692         }
3693
3694         /**
3695          * Adds inline CSS styles
3696          * Internal use only. Use OutputPage::addModuleStyles() if possible.
3697          *
3698          * @param mixed $style_css Inline CSS
3699          * @param string $flip Set to 'flip' to flip the CSS if needed
3700          */
3701         public function addInlineStyle( $style_css, $flip = 'noflip' ) {
3702                 if ( $flip === 'flip' && $this->getLanguage()->isRTL() ) {
3703                         # If wanted, and the interface is right-to-left, flip the CSS
3704                         $style_css = CSSJanus::transform( $style_css, true, false );
3705                 }
3706                 $this->mInlineStyles .= Html::inlineStyle( $style_css );
3707         }
3708
3709         /**
3710          * Build exempt modules and legacy non-ResourceLoader styles.
3711          *
3712          * @return string|WrappedStringList HTML
3713          */
3714         protected function buildExemptModules() {
3715                 $chunks = [];
3716
3717                 // Requirements:
3718                 // - Within modules provided by the software (core, skin, extensions),
3719                 //   styles from skin stylesheets should be overridden by styles
3720                 //   from modules dynamically loaded with JavaScript.
3721                 // - Styles from site-specific, private, and user modules should override
3722                 //   both of the above.
3723                 //
3724                 // The effective order for stylesheets must thus be:
3725                 // 1. Page style modules, formatted server-side by ResourceLoaderClientHtml.
3726                 // 2. Dynamically-loaded styles, inserted client-side by mw.loader.
3727                 // 3. Styles that are site-specific, private or from the user, formatted
3728                 //    server-side by this function.
3729                 //
3730                 // The 'ResourceLoaderDynamicStyles' marker helps JavaScript know where
3731                 // point #2 is.
3732
3733                 // Add legacy styles added through addStyle()/addInlineStyle() here
3734                 $chunks[] = implode( '', $this->buildCssLinksArray() ) . $this->mInlineStyles;
3735
3736                 // Things that go after the ResourceLoaderDynamicStyles marker
3737                 $append = [];
3738                 $separateReq = [ 'site.styles', 'user.styles' ];
3739                 foreach ( $this->rlExemptStyleModules as $group => $moduleNames ) {
3740                         if ( $moduleNames ) {
3741                                 $append[] = $this->makeResourceLoaderLink(
3742                                         array_diff( $moduleNames, $separateReq ),
3743                                         ResourceLoaderModule::TYPE_STYLES
3744                                 );
3745
3746                                 foreach ( array_intersect( $moduleNames, $separateReq ) as $name ) {
3747                                         // These require their own dedicated request in order to support "@import"
3748                                         // syntax, which is incompatible with concatenation. (T147667, T37562)
3749                                         $append[] = $this->makeResourceLoaderLink( $name,
3750                                                 ResourceLoaderModule::TYPE_STYLES
3751                                         );
3752                                 }
3753                         }
3754                 }
3755                 if ( $append ) {
3756                         $chunks[] = Html::element(
3757                                 'meta',
3758                                 [ 'name' => 'ResourceLoaderDynamicStyles', 'content' => '' ]
3759                         );
3760                         $chunks = array_merge( $chunks, $append );
3761                 }
3762
3763                 return self::combineWrappedStrings( $chunks );
3764         }
3765
3766         /**
3767          * @return array
3768          */
3769         public function buildCssLinksArray() {
3770                 $links = [];
3771
3772                 foreach ( $this->styles as $file => $options ) {
3773                         $link = $this->styleLink( $file, $options );
3774                         if ( $link ) {
3775                                 $links[$file] = $link;
3776                         }
3777                 }
3778                 return $links;
3779         }
3780
3781         /**
3782          * Generate \<link\> tags for stylesheets
3783          *
3784          * @param string $style URL to the file
3785          * @param array $options Option, can contain 'condition', 'dir', 'media' keys
3786          * @return string HTML fragment
3787          */
3788         protected function styleLink( $style, array $options ) {
3789                 if ( isset( $options['dir'] ) && $this->getLanguage()->getDir() != $options['dir'] ) {
3790                         return '';
3791                 }
3792
3793                 if ( isset( $options['media'] ) ) {
3794                         $media = self::transformCssMedia( $options['media'] );
3795                         if ( is_null( $media ) ) {
3796                                 return '';
3797                         }
3798                 } else {
3799                         $media = 'all';
3800                 }
3801
3802                 if ( substr( $style, 0, 1 ) == '/' ||
3803                         substr( $style, 0, 5 ) == 'http:' ||
3804                         substr( $style, 0, 6 ) == 'https:' ) {
3805                         $url = $style;
3806                 } else {
3807                         $config = $this->getConfig();
3808                         // Append file hash as query parameter
3809                         $url = self::transformResourcePath(
3810                                 $config,
3811                                 $config->get( 'StylePath' ) . '/' . $style
3812                         );
3813                 }
3814
3815                 $link = Html::linkedStyle( $url, $media );
3816
3817                 if ( isset( $options['condition'] ) ) {
3818                         $condition = htmlspecialchars( $options['condition'] );
3819                         $link = "<!--[if $condition]>$link<![endif]-->";
3820                 }
3821                 return $link;
3822         }
3823
3824         /**
3825          * Transform path to web-accessible static resource.
3826          *
3827          * This is used to add a validation hash as query string.
3828          * This aids various behaviors:
3829          *
3830          * - Put long Cache-Control max-age headers on responses for improved
3831          *   cache performance.
3832          * - Get the correct version of a file as expected by the current page.
3833          * - Instantly get the updated version of a file after deployment.
3834          *
3835          * Avoid using this for urls included in HTML as otherwise clients may get different
3836          * versions of a resource when navigating the site depending on when the page was cached.
3837          * If changes to the url propagate, this is not a problem (e.g. if the url is in
3838          * an external stylesheet).
3839          *
3840          * @since 1.27
3841          * @param Config $config
3842          * @param string $path Path-absolute URL to file (from document root, must start with "/")
3843          * @return string URL
3844          */
3845         public static function transformResourcePath( Config $config, $path ) {
3846                 global $IP;
3847
3848                 $localDir = $IP;
3849                 $remotePathPrefix = $config->get( 'ResourceBasePath' );
3850                 if ( $remotePathPrefix === '' ) {
3851                         // The configured base path is required to be empty string for
3852                         // wikis in the domain root
3853                         $remotePath = '/';
3854                 } else {
3855                         $remotePath = $remotePathPrefix;
3856                 }
3857                 if ( strpos( $path, $remotePath ) !== 0 || substr( $path, 0, 2 ) === '//' ) {
3858                         // - Path is outside wgResourceBasePath, ignore.
3859                         // - Path is protocol-relative. Fixes T155310. Not supported by RelPath lib.
3860                         return $path;
3861                 }
3862                 // For files in resources, extensions/ or skins/, ResourceBasePath is preferred here.
3863                 // For other misc files in $IP, we'll fallback to that as well. There is, however, a fourth
3864                 // supported dir/path pair in the configuration (wgUploadDirectory, wgUploadPath)
3865                 // which is not expected to be in wgResourceBasePath on CDNs. (T155146)
3866                 $uploadPath = $config->get( 'UploadPath' );
3867                 if ( strpos( $path, $uploadPath ) === 0 ) {
3868                         $localDir = $config->get( 'UploadDirectory' );
3869                         $remotePathPrefix = $remotePath = $uploadPath;
3870                 }
3871
3872                 $path = RelPath::getRelativePath( $path, $remotePath );
3873                 return self::transformFilePath( $remotePathPrefix, $localDir, $path );
3874         }
3875
3876         /**
3877          * Utility method for transformResourceFilePath().
3878          *
3879          * Caller is responsible for ensuring the file exists. Emits a PHP warning otherwise.
3880          *
3881          * @since 1.27
3882          * @param string $remotePathPrefix URL path prefix that points to $localPath
3883          * @param string $localPath File directory exposed at $remotePath
3884          * @param string $file Path to target file relative to $localPath
3885          * @return string URL
3886          */
3887         public static function transformFilePath( $remotePathPrefix, $localPath, $file ) {
3888                 $hash = md5_file( "$localPath/$file" );
3889                 if ( $hash === false ) {
3890                         wfLogWarning( __METHOD__ . ": Failed to hash $localPath/$file" );
3891                         $hash = '';
3892                 }
3893                 return "$remotePathPrefix/$file?" . substr( $hash, 0, 5 );
3894         }
3895
3896         /**
3897          * Transform "media" attribute based on request parameters
3898          *
3899          * @param string $media Current value of the "media" attribute
3900          * @return string Modified value of the "media" attribute, or null to skip
3901          * this stylesheet
3902          */
3903         public static function transformCssMedia( $media ) {
3904                 global $wgRequest;
3905
3906                 // https://www.w3.org/TR/css3-mediaqueries/#syntax
3907                 $screenMediaQueryRegex = '/^(?:only\s+)?screen\b/i';
3908
3909                 // Switch in on-screen display for media testing
3910                 $switches = [
3911                         'printable' => 'print',
3912                         'handheld' => 'handheld',
3913                 ];
3914                 foreach ( $switches as $switch => $targetMedia ) {
3915                         if ( $wgRequest->getBool( $switch ) ) {
3916                                 if ( $media == $targetMedia ) {
3917                                         $media = '';
3918                                 } elseif ( preg_match( $screenMediaQueryRegex, $media ) === 1 ) {
3919                                         /* This regex will not attempt to understand a comma-separated media_query_list
3920                                          *
3921                                          * Example supported values for $media:
3922                                          * 'screen', 'only screen', 'screen and (min-width: 982px)' ),
3923                                          * Example NOT supported value for $media:
3924                                          * '3d-glasses, screen, print and resolution > 90dpi'
3925                                          *
3926                                          * If it's a print request, we never want any kind of screen stylesheets
3927                                          * If it's a handheld request (currently the only other choice with a switch),
3928                                          * we don't want simple 'screen' but we might want screen queries that
3929                                          * have a max-width or something, so we'll pass all others on and let the
3930                                          * client do the query.
3931                                          */
3932                                         if ( $targetMedia == 'print' || $media == 'screen' ) {
3933                                                 return null;
3934                                         }
3935                                 }
3936                         }
3937                 }
3938
3939                 return $media;
3940         }
3941
3942         /**
3943          * Add a wikitext-formatted message to the output.
3944          * This is equivalent to:
3945          *
3946          *    $wgOut->addWikiText( wfMessage( ... )->plain() )
3947          */
3948         public function addWikiMsg( /*...*/ ) {
3949                 $args = func_get_args();
3950                 $name = array_shift( $args );
3951                 $this->addWikiMsgArray( $name, $args );
3952         }
3953
3954         /**
3955          * Add a wikitext-formatted message to the output.
3956          * Like addWikiMsg() except the parameters are taken as an array
3957          * instead of a variable argument list.
3958          *
3959          * @param string $name
3960          * @param array $args
3961          */
3962         public function addWikiMsgArray( $name, $args ) {
3963                 $this->addHTML( $this->msg( $name, $args )->parseAsBlock() );
3964         }
3965
3966         /**
3967          * This function takes a number of message/argument specifications, wraps them in
3968          * some overall structure, and then parses the result and adds it to the output.
3969          *
3970          * In the $wrap, $1 is replaced with the first message, $2 with the second,
3971          * and so on. The subsequent arguments may be either
3972          * 1) strings, in which case they are message names, or
3973          * 2) arrays, in which case, within each array, the first element is the message
3974          *    name, and subsequent elements are the parameters to that message.
3975          *
3976          * Don't use this for messages that are not in the user's interface language.
3977          *
3978          * For example:
3979          *
3980          *     $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>", 'some-error' );
3981          *
3982          * Is equivalent to:
3983          *
3984          *     $wgOut->addWikiTextAsInterface( "<div class='error'>\n"
3985          *         . wfMessage( 'some-error' )->plain() . "\n</div>" );
3986          *
3987          * The newline after the opening div is needed in some wikitext. See T21226.
3988          *
3989          * @param string $wrap
3990          */
3991         public function wrapWikiMsg( $wrap /*, ...*/ ) {
3992                 $msgSpecs = func_get_args();
3993                 array_shift( $msgSpecs );
3994                 $msgSpecs = array_values( $msgSpecs );
3995                 $s = $wrap;
3996                 foreach ( $msgSpecs as $n => $spec ) {
3997                         if ( is_array( $spec ) ) {
3998                                 $args = $spec;
3999                                 $name = array_shift( $args );
4000                         } else {
4001                                 $args = [];
4002                                 $name = $spec;
4003                         }
4004                         $s = str_replace( '$' . ( $n + 1 ), $this->msg( $name, $args )->plain(), $s );
4005                 }
4006                 $this->addWikiTextAsInterface( $s );
4007         }
4008
4009         /**
4010          * Whether the output has a table of contents
4011          * @return bool
4012          * @since 1.22
4013          */
4014         public function isTOCEnabled() {
4015                 return $this->mEnableTOC;
4016         }
4017
4018         /**
4019          * Helper function to setup the PHP implementation of OOUI to use in this request.
4020          *
4021          * @since 1.26
4022          * @param string $skinName The Skin name to determine the correct OOUI theme
4023          * @param string $dir Language direction
4024          */
4025         public static function setupOOUI( $skinName = 'default', $dir = 'ltr' ) {
4026                 $themes = ResourceLoaderOOUIModule::getSkinThemeMap();
4027                 $theme = $themes[$skinName] ?? $themes['default'];
4028                 // For example, 'OOUI\WikimediaUITheme'.
4029                 $themeClass = "OOUI\\{$theme}Theme";
4030                 OOUI\Theme::setSingleton( new $themeClass() );
4031                 OOUI\Element::setDefaultDir( $dir );
4032         }
4033
4034         /**
4035          * Add ResourceLoader module styles for OOUI and set up the PHP implementation of it for use with
4036          * MediaWiki and this OutputPage instance.
4037          *
4038          * @since 1.25
4039          */
4040         public function enableOOUI() {
4041                 self::setupOOUI(
4042                         strtolower( $this->getSkin()->getSkinName() ),
4043                         $this->getLanguage()->getDir()
4044                 );
4045                 $this->addModuleStyles( [
4046                         'oojs-ui-core.styles',
4047                         'oojs-ui.styles.indicators',
4048                         'mediawiki.widgets.styles',
4049                         'oojs-ui-core.icons',
4050                 ] );
4051         }
4052
4053         /**
4054          * Get (and set if not yet set) the CSP nonce.
4055          *
4056          * This value needs to be included in any <script> tags on the
4057          * page.
4058          *
4059          * @return string|bool Nonce or false to mean don't output nonce
4060          * @since 1.32
4061          */
4062         public function getCSPNonce() {
4063                 if ( !ContentSecurityPolicy::isNonceRequired( $this->getConfig() ) ) {
4064                         return false;
4065                 }
4066                 if ( $this->CSPNonce === null ) {
4067                         // XXX It might be expensive to generate randomness
4068                         // on every request, on Windows.
4069                         $rand = random_bytes( 15 );
4070                         $this->CSPNonce = base64_encode( $rand );
4071                 }
4072                 return $this->CSPNonce;
4073         }
4074
4075 }