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\Logger\LoggerFactory;
  25 use MediaWiki\MediaWikiServices;
  26 use MediaWiki\Session\SessionManager;
  27 use Wikimedia\Rdbms\IResultWrapper;
  28 use Wikimedia\RelPath;
  29 use Wikimedia\WrappedString;
  30 use Wikimedia\WrappedStringList;
  31
  32 /**
  33  * This class should be covered by a general architecture document which does
  34  * not exist as of January 2011.  This is one of the Core classes and should
  35  * be read at least once by any new developers.
  36  *
  37  * This class is used to prepare the final rendering. A skin is then
  38  * applied to the output parameters (links, javascript, html, categories ...).
  39  *
  40  * @todo FIXME: Another class handles sending the whole page to the client.
  41  *
  42  * Some comments comes from a pairing session between Zak Greant and Antoine Musso
  43  * in November 2010.
  44  *
  45  * @todo document
  46  */
  47 class OutputPage extends ContextSource {
  48         /** @var array Should be private. Used with addMeta() which adds "<meta>" */
  49         protected $mMetatags = [];
  50
  51         /** @var array */
  52         protected $mLinktags = [];
  53
  54         /** @var bool */
  55         protected $mCanonicalUrl = false;
  56
  57         /**
  58          * @var string The contents of <h1> */
  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 $mModuleScripts = [];
 158
 159         /** @var array */
 160         protected $mModuleStyles = [];
 161
 162         /** @var ResourceLoader */
 163         protected $mResourceLoader;
 164
 165         /** @var ResourceLoaderClientHtml */
 166         private $rlClient;
 167
 168         /** @var ResourceLoaderContext */
 169         private $rlClientContext;
 170
 171         /** @var array */
 172         private $rlExemptStyleModules;
 173
 174         /** @var array */
 175         protected $mJsConfigVars = [];
 176
 177         /** @var array */
 178         protected $mTemplateIds = [];
 179
 180         /** @var array */
 181         protected $mImageTimeKeys = [];
 182
 183         /** @var string */
 184         public $mRedirectCode = '';
 185
 186         protected $mFeedLinksAppendQuery = null;
 187
 188         /** @var array
 189          * What level of 'untrustworthiness' is allowed in CSS/JS modules loaded on this page?
 190          * @see ResourceLoaderModule::$origin
 191          * ResourceLoaderModule::ORIGIN_ALL is assumed unless overridden;
 192          */
 193         protected $mAllowedModules = [
 194                 ResourceLoaderModule::TYPE_COMBINED => ResourceLoaderModule::ORIGIN_ALL,
 195         ];
 196
 197         /** @var bool Whether output is disabled.  If this is true, the 'output' method will do nothing. */
 198         protected $mDoNothing = false;
 199
 200         // Parser related.
 201
 202         /** @var int */
 203         protected $mContainsNewMagic = 0;
 204
 205         /**
 206          * lazy initialised, use parserOptions()
 207          * @var ParserOptions
 208          */
 209         protected $mParserOptions = null;
 210
 211         /**
 212          * Handles the Atom / RSS links.
 213          * We probably only support Atom in 2011.
 214          * @see $wgAdvertisedFeedTypes
 215          */
 216         private $mFeedLinks = [];
 217
 218         // Gwicke work on squid caching? Roughly from 2003.
 219         protected $mEnableClientCache = true;
 220
 221         /** @var bool Flag if output should only contain the body of the article. */
 222         private $mArticleBodyOnly = false;
 223
 224         /** @var bool */
 225         protected $mNewSectionLink = false;
 226
 227         /** @var bool */
 228         protected $mHideNewSectionLink = false;
 229
 230         /**
 231          * @var bool Comes from the parser. This was probably made to load CSS/JS
 232          * only if we had "<gallery>". Used directly in CategoryPage.php.
 233          * Looks like ResourceLoader can replace this.
 234          */
 235         public $mNoGallery = false;
 236
 237         /** @var int Cache stuff. Looks like mEnableClientCache */
 238         protected $mCdnMaxage = 0;
 239         /** @var int Upper limit on mCdnMaxage */
 240         protected $mCdnMaxageLimit = INF;
 241
 242         /**
 243          * @var bool Controls if anti-clickjacking / frame-breaking headers will
 244          * be sent. This should be done for pages where edit actions are possible.
 245          * Setters: $this->preventClickjacking() and $this->allowClickjacking().
 246          */
 247         protected $mPreventClickjacking = true;
 248
 249         /** @var int To include the variable {{REVISIONID}} */
 250         private $mRevisionId = null;
 251
 252         /** @var string */
 253         private $mRevisionTimestamp = null;
 254
 255         /** @var array */
 256         protected $mFileVersion = null;
 257
 258         /**
 259          * @var array An array of stylesheet filenames (relative from skins path),
 260          * with options for CSS media, IE conditions, and RTL/LTR direction.
 261          * For internal use; add settings in the skin via $this->addStyle()
 262          *
 263          * Style again! This seems like a code duplication since we already have
 264          * mStyles. This is what makes Open Source amazing.
 265          */
 266         protected $styles = [];
 267
 268         private $mIndexPolicy = 'index';
 269         private $mFollowPolicy = 'follow';
 270
 271         /**
 272          * @var array Headers that cause the cache to vary.  Key is header name, value is an array of
 273          * options for the Key header.
 274          */
 275         private $mVaryHeader = [
 276                 'Accept-Encoding' => [ 'match=gzip' ],
 277         ];
 278
 279         /**
 280          * If the current page was reached through a redirect, $mRedirectedFrom contains the Title
 281          * of the redirect.
 282          *
 283          * @var Title
 284          */
 285         private $mRedirectedFrom = null;
 286
 287         /**
 288          * Additional key => value data
 289          */
 290         private $mProperties = [];
 291
 292         /**
 293          * @var string|null ResourceLoader target for load.php links. If null, will be omitted
 294          */
 295         private $mTarget = null;
 296
 297         /**
 298          * @var bool Whether parser output contains a table of contents
 299          */
 300         private $mEnableTOC = false;
 301
 302         /**
 303          * @var string|null The URL to send in a <link> element with rel=license
 304          */
 305         private $copyrightUrl;
 306
 307         /** @var array Profiling data */
 308         private $limitReportJSData = [];
 309
 310         /** @var array Map Title to Content */
 311         private $contentOverrides = [];
 312
 313         /** @var callable[] */
 314         private $contentOverrideCallbacks = [];
 315
 316         /**
 317          * Link: header contents
 318          */
 319         private $mLinkHeader = [];
 320
 321         /**
 322          * @var string The nonce for Content-Security-Policy
 323          */
 324         private $CSPNonce;
 325
 326         /**
 327          * Constructor for OutputPage. This should not be called directly.
 328          * Instead a new RequestContext should be created and it will implicitly create
 329          * a OutputPage tied to that context.
 330          * @param IContextSource $context
 331          */
 332         function __construct( IContextSource $context ) {
 333                 $this->setContext( $context );
 334         }
 335
 336         /**
 337          * Redirect to $url rather than displaying the normal page
 338          *
 339          * @param string $url
 340          * @param string $responsecode HTTP status code
 341          */
 342         public function redirect( $url, $responsecode = '302' ) {
 343                 # Strip newlines as a paranoia check for header injection in PHP<5.1.2
 344                 $this->mRedirect = str_replace( "\n", '', $url );
 345                 $this->mRedirectCode = $responsecode;
 346         }
 347
 348         /**
 349          * Get the URL to redirect to, or an empty string if not redirect URL set
 350          *
 351          * @return string
 352          */
 353         public function getRedirect() {
 354                 return $this->mRedirect;
 355         }
 356
 357         /**
 358          * Set the copyright URL to send with the output.
 359          * Empty string to omit, null to reset.
 360          *
 361          * @since 1.26
 362          *
 363          * @param string|null $url
 364          */
 365         public function setCopyrightUrl( $url ) {
 366                 $this->copyrightUrl = $url;
 367         }
 368
 369         /**
 370          * Set the HTTP status code to send with the output.
 371          *
 372          * @param int $statusCode
 373          */
 374         public function setStatusCode( $statusCode ) {
 375                 $this->mStatusCode = $statusCode;
 376         }
 377
 378         /**
 379          * Add a new "<meta>" tag
 380          * To add an http-equiv meta tag, precede the name with "http:"
 381          *
 382          * @param string $name Name of the meta tag
 383          * @param string $val Value of the meta tag
 384          */
 385         function addMeta( $name, $val ) {
 386                 array_push( $this->mMetatags, [ $name, $val ] );
 387         }
 388
 389         /**
 390          * Returns the current <meta> tags
 391          *
 392          * @since 1.25
 393          * @return array
 394          */
 395         public function getMetaTags() {
 396                 return $this->mMetatags;
 397         }
 398
 399         /**
 400          * Add a new \<link\> tag to the page header.
 401          *
 402          * Note: use setCanonicalUrl() for rel=canonical.
 403          *
 404          * @param array $linkarr Associative array of attributes.
 405          */
 406         function addLink( array $linkarr ) {
 407                 array_push( $this->mLinktags, $linkarr );
 408         }
 409
 410         /**
 411          * Returns the current <link> tags
 412          *
 413          * @since 1.25
 414          * @return array
 415          */
 416         public function getLinkTags() {
 417                 return $this->mLinktags;
 418         }
 419
 420         /**
 421          * Set the URL to be used for the <link rel=canonical>. This should be used
 422          * in preference to addLink(), to avoid duplicate link tags.
 423          * @param string $url
 424          */
 425         function setCanonicalUrl( $url ) {
 426                 $this->mCanonicalUrl = $url;
 427         }
 428
 429         /**
 430          * Returns the URL to be used for the <link rel=canonical> if
 431          * one is set.
 432          *
 433          * @since 1.25
 434          * @return bool|string
 435          */
 436         public function getCanonicalUrl() {
 437                 return $this->mCanonicalUrl;
 438         }
 439
 440         /**
 441          * Add raw HTML to the list of scripts (including \<script\> tag, etc.)
 442          * Internal use only. Use OutputPage::addModules() or OutputPage::addJsConfigVars()
 443          * if possible.
 444          *
 445          * @param string $script Raw HTML
 446          */
 447         function addScript( $script ) {
 448                 $this->mScripts .= $script;
 449         }
 450
 451         /**
 452          * Add a JavaScript file to be loaded as `<script>` on this page.
 453          *
 454          * Internal use only. Use OutputPage::addModules() if possible.
 455          *
 456          * @param string $file URL to file (absolute path, protocol-relative, or full url)
 457          * @param string|null $unused Previously used to change the cache-busting query parameter
 458          */
 459         public function addScriptFile( $file, $unused = null ) {
 460                 if ( substr( $file, 0, 1 ) !== '/' && !preg_match( '#^[a-z]*://#i', $file ) ) {
 461                         // This is not an absolute path, protocol-relative url, or full scheme url,
 462                         // presumed to be an old call intended to include a file from /w/skins/common,
 463                         // which doesn't exist anymore as of MediaWiki 1.24 per T71277. Ignore.
 464                         wfDeprecated( __METHOD__, '1.24' );
 465                         return;
 466                 }
 467                 $this->addScript( Html::linkedScript( $file, $this->getCSPNonce() ) );
 468         }
 469
 470         /**
 471          * Add a self-contained script tag with the given contents
 472          * Internal use only. Use OutputPage::addModules() if possible.
 473          *
 474          * @param string $script JavaScript text, no script tags
 475          */
 476         public function addInlineScript( $script ) {
 477                 $this->mScripts .= Html::inlineScript( "\n$script\n", $this->getCSPNonce() ) . "\n";
 478         }
 479
 480         /**
 481          * Filter an array of modules to remove insufficiently trustworthy members, and modules
 482          * which are no longer registered (eg a page is cached before an extension is disabled)
 483          * @param array $modules
 484          * @param string|null $position Unused
 485          * @param string $type
 486          * @return array
 487          */
 488         protected function filterModules( array $modules, $position = null,
 489                 $type = ResourceLoaderModule::TYPE_COMBINED
 490         ) {
 491                 $resourceLoader = $this->getResourceLoader();
 492                 $filteredModules = [];
 493                 foreach ( $modules as $val ) {
 494                         $module = $resourceLoader->getModule( $val );
 495                         if ( $module instanceof ResourceLoaderModule
 496                                 && $module->getOrigin() <= $this->getAllowedModules( $type )
 497                         ) {
 498                                 if ( $this->mTarget && !in_array( $this->mTarget, $module->getTargets() ) ) {
 499                                         $this->warnModuleTargetFilter( $module->getName() );
 500                                         continue;
 501                                 }
 502                                 $filteredModules[] = $val;
 503                         }
 504                 }
 505                 return $filteredModules;
 506         }
 507
 508         private function warnModuleTargetFilter( $moduleName ) {
 509                 static $warnings = [];
 510                 if ( isset( $warnings[$this->mTarget][$moduleName] ) ) {
 511                         return;
 512                 }
 513                 $warnings[$this->mTarget][$moduleName] = true;
 514                 $this->getResourceLoader()->getLogger()->debug(
 515                         'Module "{module}" not loadable on target "{target}".',
 516                         [
 517                                 'module' => $moduleName,
 518                                 'target' => $this->mTarget,
 519                         ]
 520                 );
 521         }
 522
 523         /**
 524          * Get the list of modules to include on this page
 525          *
 526          * @param bool $filter Whether to filter out insufficiently trustworthy modules
 527          * @param string|null $position Unused
 528          * @param string $param
 529          * @param string $type
 530          * @return array Array of module names
 531          */
 532         public function getModules( $filter = false, $position = null, $param = 'mModules',
 533                 $type = ResourceLoaderModule::TYPE_COMBINED
 534         ) {
 535                 $modules = array_values( array_unique( $this->$param ) );
 536                 return $filter
 537                         ? $this->filterModules( $modules, null, $type )
 538                         : $modules;
 539         }
 540
 541         /**
 542          * Load one or more ResourceLoader modules on this page.
 543          *
 544          * @param string|array $modules Module name (string) or array of module names
 545          */
 546         public function addModules( $modules ) {
 547                 $this->mModules = array_merge( $this->mModules, (array)$modules );
 548         }
 549
 550         /**
 551          * Get the list of script-only modules to load on this page.
 552          *
 553          * @param bool $filter
 554          * @param string|null $position Unused
 555          * @return array Array of module names
 556          */
 557         public function getModuleScripts( $filter = false, $position = null ) {
 558                 return $this->getModules( $filter, null, 'mModuleScripts',
 559                         ResourceLoaderModule::TYPE_SCRIPTS
 560                 );
 561         }
 562
 563         /**
 564          * Load the scripts of one or more ResourceLoader modules, on this page.
 565          *
 566          * This method exists purely to provide the legacy behaviour of loading
 567          * a module's scripts in the global scope, and without dependency resolution.
 568          * See <https://phabricator.wikimedia.org/T188689>.
 569          *
 570          * @deprecated since 1.31 Use addModules() instead.
 571          * @param string|array $modules Module name (string) or array of module names
 572          */
 573         public function addModuleScripts( $modules ) {
 574                 $this->mModuleScripts = array_merge( $this->mModuleScripts, (array)$modules );
 575         }
 576
 577         /**
 578          * Get the list of style-only modules to load on this page.
 579          *
 580          * @param bool $filter
 581          * @param string|null $position Unused
 582          * @return array Array of module names
 583          */
 584         public function getModuleStyles( $filter = false, $position = null ) {
 585                 return $this->getModules( $filter, null, 'mModuleStyles',
 586                         ResourceLoaderModule::TYPE_STYLES
 587                 );
 588         }
 589
 590         /**
 591          * Load the styles of one or more ResourceLoader modules on this page.
 592          *
 593          * Module styles added through this function will be loaded as a stylesheet,
 594          * using a standard `<link rel=stylesheet>` HTML tag, rather than as a combined
 595          * Javascript and CSS package. Thus, they will even load when JavaScript is disabled.
 596          *
 597          * @param string|array $modules Module name (string) or array of module names
 598          */
 599         public function addModuleStyles( $modules ) {
 600                 $this->mModuleStyles = array_merge( $this->mModuleStyles, (array)$modules );
 601         }
 602
 603         /**
 604          * @return null|string ResourceLoader target
 605          */
 606         public function getTarget() {
 607                 return $this->mTarget;
 608         }
 609
 610         /**
 611          * Sets ResourceLoader target for load.php links. If null, will be omitted
 612          *
 613          * @param string|null $target
 614          */
 615         public function setTarget( $target ) {
 616                 $this->mTarget = $target;
 617         }
 618
 619         /**
 620          * Add a mapping from a LinkTarget to a Content, for things like page preview.
 621          * @see self::addContentOverrideCallback()
 622          * @since 1.32
 623          * @param LinkTarget $target
 624          * @param Content $content
 625          */
 626         public function addContentOverride( LinkTarget $target, Content $content ) {
 627                 if ( !$this->contentOverrides ) {
 628                         // Register a callback for $this->contentOverrides on the first call
 629                         $this->addContentOverrideCallback( function ( LinkTarget $target ) {
 630                                 $key = $target->getNamespace() . ':' . $target->getDBkey();
 631                                 return $this->contentOverrides[$key] ?? null;
 632                         } );
 633                 }
 634
 635                 $key = $target->getNamespace() . ':' . $target->getDBkey();
 636                 $this->contentOverrides[$key] = $content;
 637         }
 638
 639         /**
 640          * Add a callback for mapping from a Title to a Content object, for things
 641          * like page preview.
 642          * @see ResourceLoaderContext::getContentOverrideCallback()
 643          * @since 1.32
 644          * @param callable $callback
 645          */
 646         public function addContentOverrideCallback( callable $callback ) {
 647                 $this->contentOverrideCallbacks[] = $callback;
 648         }
 649
 650         /**
 651          * Get an array of head items
 652          *
 653          * @return array
 654          */
 655         function getHeadItemsArray() {
 656                 return $this->mHeadItems;
 657         }
 658
 659         /**
 660          * Add or replace a head item to the output
 661          *
 662          * Whenever possible, use more specific options like ResourceLoader modules,
 663          * OutputPage::addLink(), OutputPage::addMetaLink() and OutputPage::addFeedLink()
 664          * Fallback options for those are: OutputPage::addStyle, OutputPage::addScript(),
 665          * OutputPage::addInlineScript() and OutputPage::addInlineStyle()
 666          * This would be your very LAST fallback.
 667          *
 668          * @param string $name Item name
 669          * @param string $value Raw HTML
 670          */
 671         public function addHeadItem( $name, $value ) {
 672                 $this->mHeadItems[$name] = $value;
 673         }
 674
 675         /**
 676          * Add one or more head items to the output
 677          *
 678          * @since 1.28
 679          * @param string|string[] $values Raw HTML
 680          */
 681         public function addHeadItems( $values ) {
 682                 $this->mHeadItems = array_merge( $this->mHeadItems, (array)$values );
 683         }
 684
 685         /**
 686          * Check if the header item $name is already set
 687          *
 688          * @param string $name Item name
 689          * @return bool
 690          */
 691         public function hasHeadItem( $name ) {
 692                 return isset( $this->mHeadItems[$name] );
 693         }
 694
 695         /**
 696          * Add a class to the <body> element
 697          *
 698          * @since 1.30
 699          * @param string|string[] $classes One or more classes to add
 700          */
 701         public function addBodyClasses( $classes ) {
 702                 $this->mAdditionalBodyClasses = array_merge( $this->mAdditionalBodyClasses, (array)$classes );
 703         }
 704
 705         /**
 706          * Set whether the output should only contain the body of the article,
 707          * without any skin, sidebar, etc.
 708          * Used e.g. when calling with "action=render".
 709          *
 710          * @param bool $only Whether to output only the body of the article
 711          */
 712         public function setArticleBodyOnly( $only ) {
 713                 $this->mArticleBodyOnly = $only;
 714         }
 715
 716         /**
 717          * Return whether the output will contain only the body of the article
 718          *
 719          * @return bool
 720          */
 721         public function getArticleBodyOnly() {
 722                 return $this->mArticleBodyOnly;
 723         }
 724
 725         /**
 726          * Set an additional output property
 727          * @since 1.21
 728          *
 729          * @param string $name
 730          * @param mixed $value
 731          */
 732         public function setProperty( $name, $value ) {
 733                 $this->mProperties[$name] = $value;
 734         }
 735
 736         /**
 737          * Get an additional output property
 738          * @since 1.21
 739          *
 740          * @param string $name
 741          * @return mixed Property value or null if not found
 742          */
 743         public function getProperty( $name ) {
 744                 return $this->mProperties[$name] ?? null;
 745         }
 746
 747         /**
 748          * checkLastModified tells the client to use the client-cached page if
 749          * possible. If successful, the OutputPage is disabled so that
 750          * any future call to OutputPage->output() have no effect.
 751          *
 752          * Side effect: sets mLastModified for Last-Modified header
 753          *
 754          * @param string $timestamp
 755          *
 756          * @return bool True if cache-ok headers was sent.
 757          */
 758         public function checkLastModified( $timestamp ) {
 759                 if ( !$timestamp || $timestamp == '19700101000000' ) {
 760                         wfDebug( __METHOD__ . ": CACHE DISABLED, NO TIMESTAMP\n" );
 761                         return false;
 762                 }
 763                 $config = $this->getConfig();
 764                 if ( !$config->get( 'CachePages' ) ) {
 765                         wfDebug( __METHOD__ . ": CACHE DISABLED\n" );
 766                         return false;
 767                 }
 768
 769                 $timestamp = wfTimestamp( TS_MW, $timestamp );
 770                 $modifiedTimes = [
 771                         'page' => $timestamp,
 772                         'user' => $this->getUser()->getTouched(),
 773                         'epoch' => $config->get( 'CacheEpoch' )
 774                 ];
 775                 if ( $config->get( 'UseSquid' ) ) {
 776                         $modifiedTimes['sepoch'] = wfTimestamp( TS_MW, $this->getCdnCacheEpoch(
 777                                 time(),
 778                                 $config->get( 'SquidMaxage' )
 779                         ) );
 780                 }
 781                 Hooks::run( 'OutputPageCheckLastModified', [ &$modifiedTimes, $this ] );
 782
 783                 $maxModified = max( $modifiedTimes );
 784                 $this->mLastModified = wfTimestamp( TS_RFC2822, $maxModified );
 785
 786                 $clientHeader = $this->getRequest()->getHeader( 'If-Modified-Since' );
 787                 if ( $clientHeader === false ) {
 788                         wfDebug( __METHOD__ . ": client did not send If-Modified-Since header", 'private' );
 789                         return false;
 790                 }
 791
 792                 # IE sends sizes after the date like this:
 793                 # Wed, 20 Aug 2003 06:51:19 GMT; length=5202
 794                 # this breaks strtotime().
 795                 $clientHeader = preg_replace( '/;.*$/', '', $clientHeader );
 796
 797                 Wikimedia\suppressWarnings(); // E_STRICT system time warnings
 798                 $clientHeaderTime = strtotime( $clientHeader );
 799                 Wikimedia\restoreWarnings();
 800                 if ( !$clientHeaderTime ) {
 801                         wfDebug( __METHOD__
 802                                 . ": unable to parse the client's If-Modified-Since header: $clientHeader\n" );
 803                         return false;
 804                 }
 805                 $clientHeaderTime = wfTimestamp( TS_MW, $clientHeaderTime );
 806
 807                 # Make debug info
 808                 $info = '';
 809                 foreach ( $modifiedTimes as $name => $value ) {
 810                         if ( $info !== '' ) {
 811                                 $info .= ', ';
 812                         }
 813                         $info .= "$name=" . wfTimestamp( TS_ISO_8601, $value );
 814                 }
 815
 816                 wfDebug( __METHOD__ . ": client sent If-Modified-Since: " .
 817                         wfTimestamp( TS_ISO_8601, $clientHeaderTime ), 'private' );
 818                 wfDebug( __METHOD__ . ": effective Last-Modified: " .
 819                         wfTimestamp( TS_ISO_8601, $maxModified ), 'private' );
 820                 if ( $clientHeaderTime < $maxModified ) {
 821                         wfDebug( __METHOD__ . ": STALE, $info", 'private' );
 822                         return false;
 823                 }
 824
 825                 # Not modified
 826                 # Give a 304 Not Modified response code and disable body output
 827                 wfDebug( __METHOD__ . ": NOT MODIFIED, $info", 'private' );
 828                 ini_set( 'zlib.output_compression', 0 );
 829                 $this->getRequest()->response()->statusHeader( 304 );
 830                 $this->sendCacheControl();
 831                 $this->disable();
 832
 833                 // Don't output a compressed blob when using ob_gzhandler;
 834                 // it's technically against HTTP spec and seems to confuse
 835                 // Firefox when the response gets split over two packets.
 836                 wfClearOutputBuffers();
 837
 838                 return true;
 839         }
 840
 841         /**
 842          * @param int $reqTime Time of request (eg. now)
 843          * @param int $maxAge Cache TTL in seconds
 844          * @return int Timestamp
 845          */
 846         private function getCdnCacheEpoch( $reqTime, $maxAge ) {
 847                 // Ensure Last-Modified is never more than (wgSquidMaxage) in the past,
 848                 // because even if the wiki page content hasn't changed since, static
 849                 // resources may have changed (skin HTML, interface messages, urls, etc.)
 850                 // and must roll-over in a timely manner (T46570)
 851                 return $reqTime - $maxAge;
 852         }
 853
 854         /**
 855          * Override the last modified timestamp
 856          *
 857          * @param string $timestamp New timestamp, in a format readable by
 858          *        wfTimestamp()
 859          */
 860         public function setLastModified( $timestamp ) {
 861                 $this->mLastModified = wfTimestamp( TS_RFC2822, $timestamp );
 862         }
 863
 864         /**
 865          * Set the robot policy for the page: <http://www.robotstxt.org/meta.html>
 866          *
 867          * @param string $policy The literal string to output as the contents of
 868          *   the meta tag.  Will be parsed according to the spec and output in
 869          *   standardized form.
 870          * @return null
 871          */
 872         public function setRobotPolicy( $policy ) {
 873                 $policy = Article::formatRobotPolicy( $policy );
 874
 875                 if ( isset( $policy['index'] ) ) {
 876                         $this->setIndexPolicy( $policy['index'] );
 877                 }
 878                 if ( isset( $policy['follow'] ) ) {
 879                         $this->setFollowPolicy( $policy['follow'] );
 880                 }
 881         }
 882
 883         /**
 884          * Set the index policy for the page, but leave the follow policy un-
 885          * touched.
 886          *
 887          * @param string $policy Either 'index' or 'noindex'.
 888          * @return null
 889          */
 890         public function setIndexPolicy( $policy ) {
 891                 $policy = trim( $policy );
 892                 if ( in_array( $policy, [ 'index', 'noindex' ] ) ) {
 893                         $this->mIndexPolicy = $policy;
 894                 }
 895         }
 896
 897         /**
 898          * Set the follow policy for the page, but leave the index policy un-
 899          * touched.
 900          *
 901          * @param string $policy Either 'follow' or 'nofollow'.
 902          * @return null
 903          */
 904         public function setFollowPolicy( $policy ) {
 905                 $policy = trim( $policy );
 906                 if ( in_array( $policy, [ 'follow', 'nofollow' ] ) ) {
 907                         $this->mFollowPolicy = $policy;
 908                 }
 909         }
 910
 911         /**
 912          * "HTML title" means the contents of "<title>".
 913          * It is stored as plain, unescaped text and will be run through htmlspecialchars in the skin file.
 914          *
 915          * @param string|Message $name
 916          */
 917         public function setHTMLTitle( $name ) {
 918                 if ( $name instanceof Message ) {
 919                         $this->mHTMLtitle = $name->setContext( $this->getContext() )->text();
 920                 } else {
 921                         $this->mHTMLtitle = $name;
 922                 }
 923         }
 924
 925         /**
 926          * Return the "HTML title", i.e. the content of the "<title>" tag.
 927          *
 928          * @return string
 929          */
 930         public function getHTMLTitle() {
 931                 return $this->mHTMLtitle;
 932         }
 933
 934         /**
 935          * Set $mRedirectedFrom, the Title of the page which redirected us to the current page.
 936          *
 937          * @param Title $t
 938          */
 939         public function setRedirectedFrom( $t ) {
 940                 $this->mRedirectedFrom = $t;
 941         }
 942
 943         /**
 944          * "Page title" means the contents of \<h1\>. It is stored as a valid HTML
 945          * fragment. This function allows good tags like \<sup\> in the \<h1\> tag,
 946          * but not bad tags like \<script\>. This function automatically sets
 947          * \<title\> to the same content as \<h1\> but with all tags removed. Bad
 948          * tags that were escaped in \<h1\> will still be escaped in \<title\>, and
 949          * good tags like \<i\> will be dropped entirely.
 950          *
 951          * @param string|Message $name
 952          */
 953         public function setPageTitle( $name ) {
 954                 if ( $name instanceof Message ) {
 955                         $name = $name->setContext( $this->getContext() )->text();
 956                 }
 957
 958                 # change "<script>foo&bar</script>" to "&lt;script&gt;foo&amp;bar&lt;/script&gt;"
 959                 # but leave "<i>foobar</i>" alone
 960                 $nameWithTags = Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags( $name ) );
 961                 $this->mPageTitle = $nameWithTags;
 962
 963                 # change "<i>foo&amp;bar</i>" to "foo&bar"
 964                 $this->setHTMLTitle(
 965                         $this->msg( 'pagetitle' )->rawParams( Sanitizer::stripAllTags( $nameWithTags ) )
 966                                 ->inContentLanguage()
 967                 );
 968         }
 969
 970         /**
 971          * Return the "page title", i.e. the content of the \<h1\> tag.
 972          *
 973          * @return string
 974          */
 975         public function getPageTitle() {
 976                 return $this->mPageTitle;
 977         }
 978
 979         /**
 980          * Same as page title but only contains name of the page, not any other text.
 981          *
 982          * @since 1.32
 983          * @param string $html Page title text.
 984          * @see OutputPage::setPageTitle
 985          */
 986         public function setDisplayTitle( $html ) {
 987                 $this->displayTitle = $html;
 988         }
 989
 990         /**
 991          * Returns page display title.
 992          *
 993          * Performs some normalization, but this not as strict the magic word.
 994          *
 995          * @since 1.32
 996          * @return string HTML
 997          */
 998         public function getDisplayTitle() {
 999                 $html = $this->displayTitle;
1000                 if ( $html === null ) {
1001                         $html = $this->getTitle()->getPrefixedText();
1002                 }
1003
1004                 return Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags( $html ) );
1005         }
1006
1007         /**
1008          * Returns page display title without namespace prefix if possible.
1009          *
1010          * @since 1.32
1011          * @return string HTML
1012          */
1013         public function getUnprefixedDisplayTitle() {
1014                 $text = $this->getDisplayTitle();
1015                 $nsPrefix = $this->getTitle()->getNsText() . ':';
1016                 $prefix = preg_quote( $nsPrefix, '/' );
1017
1018                 return preg_replace( "/^$prefix/i", '', $text );
1019         }
1020
1021         /**
1022          * Set the Title object to use
1023          *
1024          * @param Title $t
1025          */
1026         public function setTitle( Title $t ) {
1027                 $this->getContext()->setTitle( $t );
1028         }
1029
1030         /**
1031          * Replace the subtitle with $str
1032          *
1033          * @param string|Message $str New value of the subtitle. String should be safe HTML.
1034          */
1035         public function setSubtitle( $str ) {
1036                 $this->clearSubtitle();
1037                 $this->addSubtitle( $str );
1038         }
1039
1040         /**
1041          * Add $str to the subtitle
1042          *
1043          * @param string|Message $str String or Message to add to the subtitle. String should be safe HTML.
1044          */
1045         public function addSubtitle( $str ) {
1046                 if ( $str instanceof Message ) {
1047                         $this->mSubtitle[] = $str->setContext( $this->getContext() )->parse();
1048                 } else {
1049                         $this->mSubtitle[] = $str;
1050                 }
1051         }
1052
1053         /**
1054          * Build message object for a subtitle containing a backlink to a page
1055          *
1056          * @param Title $title Title to link to
1057          * @param array $query Array of additional parameters to include in the link
1058          * @return Message
1059          * @since 1.25
1060          */
1061         public static function buildBacklinkSubtitle( Title $title, $query = [] ) {
1062                 if ( $title->isRedirect() ) {
1063                         $query['redirect'] = 'no';
1064                 }
1065                 $linkRenderer = MediaWikiServices::getInstance()->getLinkRenderer();
1066                 return wfMessage( 'backlinksubtitle' )
1067                         ->rawParams( $linkRenderer->makeLink( $title, null, [], $query ) );
1068         }
1069
1070         /**
1071          * Add a subtitle containing a backlink to a page
1072          *
1073          * @param Title $title Title to link to
1074          * @param array $query Array of additional parameters to include in the link
1075          */
1076         public function addBacklinkSubtitle( Title $title, $query = [] ) {
1077                 $this->addSubtitle( self::buildBacklinkSubtitle( $title, $query ) );
1078         }
1079
1080         /**
1081          * Clear the subtitles
1082          */
1083         public function clearSubtitle() {
1084                 $this->mSubtitle = [];
1085         }
1086
1087         /**
1088          * Get the subtitle
1089          *
1090          * @return string
1091          */
1092         public function getSubtitle() {
1093                 return implode( "<br />\n\t\t\t\t", $this->mSubtitle );
1094         }
1095
1096         /**
1097          * Set the page as printable, i.e. it'll be displayed with all
1098          * print styles included
1099          */
1100         public function setPrintable() {
1101                 $this->mPrintable = true;
1102         }
1103
1104         /**
1105          * Return whether the page is "printable"
1106          *
1107          * @return bool
1108          */
1109         public function isPrintable() {
1110                 return $this->mPrintable;
1111         }
1112
1113         /**
1114          * Disable output completely, i.e. calling output() will have no effect
1115          */
1116         public function disable() {
1117                 $this->mDoNothing = true;
1118         }
1119
1120         /**
1121          * Return whether the output will be completely disabled
1122          *
1123          * @return bool
1124          */
1125         public function isDisabled() {
1126                 return $this->mDoNothing;
1127         }
1128
1129         /**
1130          * Show an "add new section" link?
1131          *
1132          * @return bool
1133          */
1134         public function showNewSectionLink() {
1135                 return $this->mNewSectionLink;
1136         }
1137
1138         /**
1139          * Forcibly hide the new section link?
1140          *
1141          * @return bool
1142          */
1143         public function forceHideNewSectionLink() {
1144                 return $this->mHideNewSectionLink;
1145         }
1146
1147         /**
1148          * Add or remove feed links in the page header
1149          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
1150          * for the new version
1151          * @see addFeedLink()
1152          *
1153          * @param bool $show True: add default feeds, false: remove all feeds
1154          */
1155         public function setSyndicated( $show = true ) {
1156                 if ( $show ) {
1157                         $this->setFeedAppendQuery( false );
1158                 } else {
1159                         $this->mFeedLinks = [];
1160                 }
1161         }
1162
1163         /**
1164          * Add default feeds to the page header
1165          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
1166          * for the new version
1167          * @see addFeedLink()
1168          *
1169          * @param string $val Query to append to feed links or false to output
1170          *        default links
1171          */
1172         public function setFeedAppendQuery( $val ) {
1173                 $this->mFeedLinks = [];
1174
1175                 foreach ( $this->getConfig()->get( 'AdvertisedFeedTypes' ) as $type ) {
1176                         $query = "feed=$type";
1177                         if ( is_string( $val ) ) {
1178                                 $query .= '&' . $val;
1179                         }
1180                         $this->mFeedLinks[$type] = $this->getTitle()->getLocalURL( $query );
1181                 }
1182         }
1183
1184         /**
1185          * Add a feed link to the page header
1186          *
1187          * @param string $format Feed type, should be a key of $wgFeedClasses
1188          * @param string $href URL
1189          */
1190         public function addFeedLink( $format, $href ) {
1191                 if ( in_array( $format, $this->getConfig()->get( 'AdvertisedFeedTypes' ) ) ) {
1192                         $this->mFeedLinks[$format] = $href;
1193                 }
1194         }
1195
1196         /**
1197          * Should we output feed links for this page?
1198          * @return bool
1199          */
1200         public function isSyndicated() {
1201                 return count( $this->mFeedLinks ) > 0;
1202         }
1203
1204         /**
1205          * Return URLs for each supported syndication format for this page.
1206          * @return array Associating format keys with URLs
1207          */
1208         public function getSyndicationLinks() {
1209                 return $this->mFeedLinks;
1210         }
1211
1212         /**
1213          * Will currently always return null
1214          *
1215          * @return null
1216          */
1217         public function getFeedAppendQuery() {
1218                 return $this->mFeedLinksAppendQuery;
1219         }
1220
1221         /**
1222          * Set whether the displayed content is related to the source of the
1223          * corresponding article on the wiki
1224          * Setting true will cause the change "article related" toggle to true
1225          *
1226          * @param bool $newVal
1227          */
1228         public function setArticleFlag( $newVal ) {
1229                 $this->mIsArticle = $newVal;
1230                 if ( $newVal ) {
1231                         $this->mIsArticleRelated = $newVal;
1232                 }
1233         }
1234
1235         /**
1236          * Return whether the content displayed page is related to the source of
1237          * the corresponding article on the wiki
1238          *
1239          * @return bool
1240          */
1241         public function isArticle() {
1242                 return $this->mIsArticle;
1243         }
1244
1245         /**
1246          * Set whether this page is related an article on the wiki
1247          * Setting false will cause the change of "article flag" toggle to false
1248          *
1249          * @param bool $newVal
1250          */
1251         public function setArticleRelated( $newVal ) {
1252                 $this->mIsArticleRelated = $newVal;
1253                 if ( !$newVal ) {
1254                         $this->mIsArticle = false;
1255                 }
1256         }
1257
1258         /**
1259          * Return whether this page is related an article on the wiki
1260          *
1261          * @return bool
1262          */
1263         public function isArticleRelated() {
1264                 return $this->mIsArticleRelated;
1265         }
1266
1267         /**
1268          * Set whether the standard copyright should be shown for the current page.
1269          *
1270          * @param bool $hasCopyright
1271          */
1272         public function setCopyright( $hasCopyright ) {
1273                 $this->mHasCopyright = $hasCopyright;
1274         }
1275
1276         /**
1277          * Return whether the standard copyright should be shown for the current page.
1278          * By default, it is true for all articles but other pages
1279          * can signal it by using setCopyright( true ).
1280          *
1281          * Used by SkinTemplate to decided whether to show the copyright.
1282          *
1283          * @return bool
1284          */
1285         public function showsCopyright() {
1286                 return $this->isArticle() || $this->mHasCopyright;
1287         }
1288
1289         /**
1290          * Add new language links
1291          *
1292          * @param string[] $newLinkArray Array of interwiki-prefixed (non DB key) titles
1293          *                               (e.g. 'fr:Test page')
1294          */
1295         public function addLanguageLinks( array $newLinkArray ) {
1296                 $this->mLanguageLinks = array_merge( $this->mLanguageLinks, $newLinkArray );
1297         }
1298
1299         /**
1300          * Reset the language links and add new language links
1301          *
1302          * @param string[] $newLinkArray Array of interwiki-prefixed (non DB key) titles
1303          *                               (e.g. 'fr:Test page')
1304          */
1305         public function setLanguageLinks( array $newLinkArray ) {
1306                 $this->mLanguageLinks = $newLinkArray;
1307         }
1308
1309         /**
1310          * Get the list of language links
1311          *
1312          * @return string[] Array of interwiki-prefixed (non DB key) titles (e.g. 'fr:Test page')
1313          */
1314         public function getLanguageLinks() {
1315                 return $this->mLanguageLinks;
1316         }
1317
1318         /**
1319          * Add an array of categories, with names in the keys
1320          *
1321          * @param array $categories Mapping category name => sort key
1322          */
1323         public function addCategoryLinks( array $categories ) {
1324                 if ( !$categories ) {
1325                         return;
1326                 }
1327
1328                 $res = $this->addCategoryLinksToLBAndGetResult( $categories );
1329
1330                 # Set all the values to 'normal'.
1331                 $categories = array_fill_keys( array_keys( $categories ), 'normal' );
1332
1333                 # Mark hidden categories
1334                 foreach ( $res as $row ) {
1335                         if ( isset( $row->pp_value ) ) {
1336                                 $categories[$row->page_title] = 'hidden';
1337                         }
1338                 }
1339
1340                 // Avoid PHP 7.1 warning of passing $this by reference
1341                 $outputPage = $this;
1342                 # Add the remaining categories to the skin
1343                 if ( Hooks::run(
1344                         'OutputPageMakeCategoryLinks',
1345                         [ &$outputPage, $categories, &$this->mCategoryLinks ] )
1346                 ) {
1347                         $services = MediaWikiServices::getInstance();
1348                         $linkRenderer = $services->getLinkRenderer();
1349                         foreach ( $categories as $category => $type ) {
1350                                 // array keys will cast numeric category names to ints, so cast back to string
1351                                 $category = (string)$category;
1352                                 $origcategory = $category;
1353                                 $title = Title::makeTitleSafe( NS_CATEGORY, $category );
1354                                 if ( !$title ) {
1355                                         continue;
1356                                 }
1357                                 $services->getContentLanguage()->findVariantLink( $category, $title, true );
1358                                 if ( $category != $origcategory && array_key_exists( $category, $categories ) ) {
1359                                         continue;
1360                                 }
1361                                 $text = $services->getContentLanguage()->convertHtml( $title->getText() );
1362                                 $this->mCategories[$type][] = $title->getText();
1363                                 $this->mCategoryLinks[$type][] = $linkRenderer->makeLink( $title, new HtmlArmor( $text ) );
1364                         }
1365                 }
1366         }
1367
1368         /**
1369          * @param array $categories
1370          * @return bool|IResultWrapper
1371          */
1372         protected function addCategoryLinksToLBAndGetResult( array $categories ) {
1373                 # Add the links to a LinkBatch
1374                 $arr = [ NS_CATEGORY => $categories ];
1375                 $lb = new LinkBatch;
1376                 $lb->setArray( $arr );
1377
1378                 # Fetch existence plus the hiddencat property
1379                 $dbr = wfGetDB( DB_REPLICA );
1380                 $fields = array_merge(
1381                         LinkCache::getSelectFields(),
1382                         [ 'page_namespace', 'page_title', 'pp_value' ]
1383                 );
1384
1385                 $res = $dbr->select( [ 'page', 'page_props' ],
1386                         $fields,
1387                         $lb->constructSet( 'page', $dbr ),
1388                         __METHOD__,
1389                         [],
1390                         [ 'page_props' => [ 'LEFT JOIN', [
1391                                 'pp_propname' => 'hiddencat',
1392                                 'pp_page = page_id'
1393                         ] ] ]
1394                 );
1395
1396                 # Add the results to the link cache
1397                 $linkCache = MediaWikiServices::getInstance()->getLinkCache();
1398                 $lb->addResultToCache( $linkCache, $res );
1399
1400                 return $res;
1401         }
1402
1403         /**
1404          * Reset the category links (but not the category list) and add $categories
1405          *
1406          * @param array $categories Mapping category name => sort key
1407          */
1408         public function setCategoryLinks( array $categories ) {
1409                 $this->mCategoryLinks = [];
1410                 $this->addCategoryLinks( $categories );
1411         }
1412
1413         /**
1414          * Get the list of category links, in a 2-D array with the following format:
1415          * $arr[$type][] = $link, where $type is either "normal" or "hidden" (for
1416          * hidden categories) and $link a HTML fragment with a link to the category
1417          * page
1418          *
1419          * @return array
1420          */
1421         public function getCategoryLinks() {
1422                 return $this->mCategoryLinks;
1423         }
1424
1425         /**
1426          * Get the list of category names this page belongs to.
1427          *
1428          * @param string $type The type of categories which should be returned. Possible values:
1429          *  * all: all categories of all types
1430          *  * hidden: only the hidden categories
1431          *  * normal: all categories, except hidden categories
1432          * @return array Array of strings
1433          */
1434         public function getCategories( $type = 'all' ) {
1435                 if ( $type === 'all' ) {
1436                         $allCategories = [];
1437                         foreach ( $this->mCategories as $categories ) {
1438                                 $allCategories = array_merge( $allCategories, $categories );
1439                         }
1440                         return $allCategories;
1441                 }
1442                 if ( !isset( $this->mCategories[$type] ) ) {
1443                         throw new InvalidArgumentException( 'Invalid category type given: ' . $type );
1444                 }
1445                 return $this->mCategories[$type];
1446         }
1447
1448         /**
1449          * Add an array of indicators, with their identifiers as array
1450          * keys and HTML contents as values.
1451          *
1452          * In case of duplicate keys, existing values are overwritten.
1453          *
1454          * @param array $indicators
1455          * @since 1.25
1456          */
1457         public function setIndicators( array $indicators ) {
1458                 $this->mIndicators = $indicators + $this->mIndicators;
1459                 // Keep ordered by key
1460                 ksort( $this->mIndicators );
1461         }
1462
1463         /**
1464          * Get the indicators associated with this page.
1465          *
1466          * The array will be internally ordered by item keys.
1467          *
1468          * @return array Keys: identifiers, values: HTML contents
1469          * @since 1.25
1470          */
1471         public function getIndicators() {
1472                 return $this->mIndicators;
1473         }
1474
1475         /**
1476          * Adds help link with an icon via page indicators.
1477          * Link target can be overridden by a local message containing a wikilink:
1478          * the message key is: lowercase action or special page name + '-helppage'.
1479          * @param string $to Target MediaWiki.org page title or encoded URL.
1480          * @param bool $overrideBaseUrl Whether $url is a full URL, to avoid MW.o.
1481          * @since 1.25
1482          */
1483         public function addHelpLink( $to, $overrideBaseUrl = false ) {
1484                 $this->addModuleStyles( 'mediawiki.helplink' );
1485                 $text = $this->msg( 'helppage-top-gethelp' )->escaped();
1486
1487                 if ( $overrideBaseUrl ) {
1488                         $helpUrl = $to;
1489                 } else {
1490                         $toUrlencoded = wfUrlencode( str_replace( ' ', '_', $to ) );
1491                         $helpUrl = "//www.mediawiki.org/wiki/Special:MyLanguage/$toUrlencoded";
1492                 }
1493
1494                 $link = Html::rawElement(
1495                         'a',
1496                         [
1497                                 'href' => $helpUrl,
1498                                 'target' => '_blank',
1499                                 'class' => 'mw-helplink',
1500                         ],
1501                         $text
1502                 );
1503
1504                 $this->setIndicators( [ 'mw-helplink' => $link ] );
1505         }
1506
1507         /**
1508          * Do not allow scripts which can be modified by wiki users to load on this page;
1509          * only allow scripts bundled with, or generated by, the software.
1510          * Site-wide styles are controlled by a config setting, since they can be
1511          * used to create a custom skin/theme, but not user-specific ones.
1512          *
1513          * @todo this should be given a more accurate name
1514          */
1515         public function disallowUserJs() {
1516                 $this->reduceAllowedModules(
1517                         ResourceLoaderModule::TYPE_SCRIPTS,
1518                         ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL
1519                 );
1520
1521                 // Site-wide styles are controlled by a config setting, see T73621
1522                 // for background on why. User styles are never allowed.
1523                 if ( $this->getConfig()->get( 'AllowSiteCSSOnRestrictedPages' ) ) {
1524                         $styleOrigin = ResourceLoaderModule::ORIGIN_USER_SITEWIDE;
1525                 } else {
1526                         $styleOrigin = ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL;
1527                 }
1528                 $this->reduceAllowedModules(
1529                         ResourceLoaderModule::TYPE_STYLES,
1530                         $styleOrigin
1531                 );
1532         }
1533
1534         /**
1535          * Show what level of JavaScript / CSS untrustworthiness is allowed on this page
1536          * @see ResourceLoaderModule::$origin
1537          * @param string $type ResourceLoaderModule TYPE_ constant
1538          * @return int ResourceLoaderModule ORIGIN_ class constant
1539          */
1540         public function getAllowedModules( $type ) {
1541                 if ( $type == ResourceLoaderModule::TYPE_COMBINED ) {
1542                         return min( array_values( $this->mAllowedModules ) );
1543                 } else {
1544                         return $this->mAllowedModules[$type] ?? ResourceLoaderModule::ORIGIN_ALL;
1545                 }
1546         }
1547
1548         /**
1549          * Limit the highest level of CSS/JS untrustworthiness allowed.
1550          *
1551          * If passed the same or a higher level than the current level of untrustworthiness set, the
1552          * level will remain unchanged.
1553          *
1554          * @param string $type
1555          * @param int $level ResourceLoaderModule class constant
1556          */
1557         public function reduceAllowedModules( $type, $level ) {
1558                 $this->mAllowedModules[$type] = min( $this->getAllowedModules( $type ), $level );
1559         }
1560
1561         /**
1562          * Prepend $text to the body HTML
1563          *
1564          * @param string $text HTML
1565          */
1566         public function prependHTML( $text ) {
1567                 $this->mBodytext = $text . $this->mBodytext;
1568         }
1569
1570         /**
1571          * Append $text to the body HTML
1572          *
1573          * @param string $text HTML
1574          */
1575         public function addHTML( $text ) {
1576                 $this->mBodytext .= $text;
1577         }
1578
1579         /**
1580          * Shortcut for adding an Html::element via addHTML.
1581          *
1582          * @since 1.19
1583          *
1584          * @param string $element
1585          * @param array $attribs
1586          * @param string $contents
1587          */
1588         public function addElement( $element, array $attribs = [], $contents = '' ) {
1589                 $this->addHTML( Html::element( $element, $attribs, $contents ) );
1590         }
1591
1592         /**
1593          * Clear the body HTML
1594          */
1595         public function clearHTML() {
1596                 $this->mBodytext = '';
1597         }
1598
1599         /**
1600          * Get the body HTML
1601          *
1602          * @return string HTML
1603          */
1604         public function getHTML() {
1605                 return $this->mBodytext;
1606         }
1607
1608         /**
1609          * Get/set the ParserOptions object to use for wikitext parsing
1610          *
1611          * @param ParserOptions|null $options Either the ParserOption to use or null to only get the
1612          *   current ParserOption object. This parameter is deprecated since 1.31.
1613          * @return ParserOptions
1614          */
1615         public function parserOptions( $options = null ) {
1616                 if ( $options !== null ) {
1617                         wfDeprecated( __METHOD__ . ' with non-null $options', '1.31' );
1618                 }
1619
1620                 if ( $options !== null && !empty( $options->isBogus ) ) {
1621                         // Someone is trying to set a bogus pre-$wgUser PO. Check if it has
1622                         // been changed somehow, and keep it if so.
1623                         $anonPO = ParserOptions::newFromAnon();
1624                         $anonPO->setAllowUnsafeRawHtml( false );
1625                         if ( !$options->matches( $anonPO ) ) {
1626                                 wfLogWarning( __METHOD__ . ': Setting a changed bogus ParserOptions: ' . wfGetAllCallers( 5 ) );
1627                                 $options->isBogus = false;
1628                         }
1629                 }
1630
1631                 if ( !$this->mParserOptions ) {
1632                         if ( !$this->getContext()->getUser()->isSafeToLoad() ) {
1633                                 // $wgUser isn't unstubbable yet, so don't try to get a
1634                                 // ParserOptions for it. And don't cache this ParserOptions
1635                                 // either.
1636                                 $po = ParserOptions::newFromAnon();
1637                                 $po->setAllowUnsafeRawHtml( false );
1638                                 $po->isBogus = true;
1639                                 if ( $options !== null ) {
1640                                         $this->mParserOptions = empty( $options->isBogus ) ? $options : null;
1641                                 }
1642                                 return $po;
1643                         }
1644
1645                         $this->mParserOptions = ParserOptions::newFromContext( $this->getContext() );
1646                         $this->mParserOptions->setAllowUnsafeRawHtml( false );
1647                 }
1648
1649                 if ( $options !== null && !empty( $options->isBogus ) ) {
1650                         // They're trying to restore the bogus pre-$wgUser PO. Do the right
1651                         // thing.
1652                         return wfSetVar( $this->mParserOptions, null, true );
1653                 } else {
1654                         return wfSetVar( $this->mParserOptions, $options );
1655                 }
1656         }
1657
1658         /**
1659          * Set the revision ID which will be seen by the wiki text parser
1660          * for things such as embedded {{REVISIONID}} variable use.
1661          *
1662          * @param int|null $revid A positive integer, or null
1663          * @return mixed Previous value
1664          */
1665         public function setRevisionId( $revid ) {
1666                 $val = is_null( $revid ) ? null : intval( $revid );
1667                 return wfSetVar( $this->mRevisionId, $val, true );
1668         }
1669
1670         /**
1671          * Get the displayed revision ID
1672          *
1673          * @return int
1674          */
1675         public function getRevisionId() {
1676                 return $this->mRevisionId;
1677         }
1678
1679         /**
1680          * Set the timestamp of the revision which will be displayed. This is used
1681          * to avoid a extra DB call in Skin::lastModified().
1682          *
1683          * @param string|null $timestamp
1684          * @return mixed Previous value
1685          */
1686         public function setRevisionTimestamp( $timestamp ) {
1687                 return wfSetVar( $this->mRevisionTimestamp, $timestamp, true );
1688         }
1689
1690         /**
1691          * Get the timestamp of displayed revision.
1692          * This will be null if not filled by setRevisionTimestamp().
1693          *
1694          * @return string|null
1695          */
1696         public function getRevisionTimestamp() {
1697                 return $this->mRevisionTimestamp;
1698         }
1699
1700         /**
1701          * Set the displayed file version
1702          *
1703          * @param File|null $file
1704          * @return mixed Previous value
1705          */
1706         public function setFileVersion( $file ) {
1707                 $val = null;
1708                 if ( $file instanceof File && $file->exists() ) {
1709                         $val = [ 'time' => $file->getTimestamp(), 'sha1' => $file->getSha1() ];
1710                 }
1711                 return wfSetVar( $this->mFileVersion, $val, true );
1712         }
1713
1714         /**
1715          * Get the displayed file version
1716          *
1717          * @return array|null ('time' => MW timestamp, 'sha1' => sha1)
1718          */
1719         public function getFileVersion() {
1720                 return $this->mFileVersion;
1721         }
1722
1723         /**
1724          * Get the templates used on this page
1725          *
1726          * @return array (namespace => dbKey => revId)
1727          * @since 1.18
1728          */
1729         public function getTemplateIds() {
1730                 return $this->mTemplateIds;
1731         }
1732
1733         /**
1734          * Get the files used on this page
1735          *
1736          * @return array (dbKey => array('time' => MW timestamp or null, 'sha1' => sha1 or ''))
1737          * @since 1.18
1738          */
1739         public function getFileSearchOptions() {
1740                 return $this->mImageTimeKeys;
1741         }
1742
1743         /**
1744          * Convert wikitext to HTML and add it to the buffer
1745          * Default assumes that the current page title will be used.
1746          *
1747          * @param string $text
1748          * @param bool $linestart Is this the start of a line?
1749          * @param bool $interface Is this text in the user interface language?
1750          * @throws MWException
1751          */
1752         public function addWikiText( $text, $linestart = true, $interface = true ) {
1753                 $title = $this->getTitle(); // Work around E_STRICT
1754                 if ( !$title ) {
1755                         throw new MWException( 'Title is null' );
1756                 }
1757                 $this->addWikiTextTitle( $text, $title, $linestart, /*tidy*/false, $interface );
1758         }
1759
1760         /**
1761          * Add wikitext with a custom Title object
1762          *
1763          * @param string $text Wikitext
1764          * @param Title $title
1765          * @param bool $linestart Is this the start of a line?
1766          */
1767         public function addWikiTextWithTitle( $text, Title $title, $linestart = true ) {
1768                 $this->addWikiTextTitle( $text, $title, $linestart );
1769         }
1770
1771         /**
1772          * Add wikitext with a custom Title object and tidy enabled.
1773          *
1774          * @param string $text Wikitext
1775          * @param Title $title
1776          * @param bool $linestart Is this the start of a line?
1777          */
1778         function addWikiTextTitleTidy( $text, Title $title, $linestart = true ) {
1779                 $this->addWikiTextTitle( $text, $title, $linestart, true );
1780         }
1781
1782         /**
1783          * Add wikitext with tidy enabled
1784          *
1785          * @param string $text Wikitext
1786          * @param bool $linestart Is this the start of a line?
1787          */
1788         public function addWikiTextTidy( $text, $linestart = true ) {
1789                 $title = $this->getTitle();
1790                 $this->addWikiTextTitleTidy( $text, $title, $linestart );
1791         }
1792
1793         /**
1794          * Add wikitext with a custom Title object.
1795          * Output is unwrapped.
1796          *
1797          * @param string $text Wikitext
1798          * @param Title $title
1799          * @param bool $linestart Is this the start of a line?
1800          * @param bool $tidy Whether to use tidy
1801          * @param bool $interface Whether it is an interface message
1802          *   (for example disables conversion)
1803          */
1804         public function addWikiTextTitle( $text, Title $title, $linestart,
1805                 $tidy = false, $interface = false
1806         ) {
1807                 global $wgParser;
1808
1809                 $popts = $this->parserOptions();
1810                 $oldTidy = $popts->setTidy( $tidy );
1811                 $popts->setInterfaceMessage( (bool)$interface );
1812
1813                 $parserOutput = $wgParser->getFreshParser()->parse(
1814                         $text, $title, $popts,
1815                         $linestart, true, $this->mRevisionId
1816                 );
1817
1818                 $popts->setTidy( $oldTidy );
1819
1820                 $this->addParserOutput( $parserOutput, [
1821                         'enableSectionEditLinks' => false,
1822                         'wrapperDivClass' => '',
1823                 ] );
1824         }
1825
1826         /**
1827          * Add all metadata associated with a ParserOutput object, but without the actual HTML. This
1828          * includes categories, language links, ResourceLoader modules, effects of certain magic words,
1829          * and so on.
1830          *
1831          * @since 1.24
1832          * @param ParserOutput $parserOutput
1833          */
1834         public function addParserOutputMetadata( ParserOutput $parserOutput ) {
1835                 $this->mLanguageLinks =
1836                         array_merge( $this->mLanguageLinks, $parserOutput->getLanguageLinks() );
1837                 $this->addCategoryLinks( $parserOutput->getCategories() );
1838                 $this->setIndicators( $parserOutput->getIndicators() );
1839                 $this->mNewSectionLink = $parserOutput->getNewSection();
1840                 $this->mHideNewSectionLink = $parserOutput->getHideNewSection();
1841
1842                 if ( !$parserOutput->isCacheable() ) {
1843                         $this->enableClientCache( false );
1844                 }
1845                 $this->mNoGallery = $parserOutput->getNoGallery();
1846                 $this->mHeadItems = array_merge( $this->mHeadItems, $parserOutput->getHeadItems() );
1847                 $this->addModules( $parserOutput->getModules() );
1848                 $this->addModuleScripts( $parserOutput->getModuleScripts() );
1849                 $this->addModuleStyles( $parserOutput->getModuleStyles() );
1850                 $this->addJsConfigVars( $parserOutput->getJsConfigVars() );
1851                 $this->mPreventClickjacking = $this->mPreventClickjacking
1852                         || $parserOutput->preventClickjacking();
1853
1854                 // Template versioning...
1855                 foreach ( (array)$parserOutput->getTemplateIds() as $ns => $dbks ) {
1856                         if ( isset( $this->mTemplateIds[$ns] ) ) {
1857                                 $this->mTemplateIds[$ns] = $dbks + $this->mTemplateIds[$ns];
1858                         } else {
1859                                 $this->mTemplateIds[$ns] = $dbks;
1860                         }
1861                 }
1862                 // File versioning...
1863                 foreach ( (array)$parserOutput->getFileSearchOptions() as $dbk => $data ) {
1864                         $this->mImageTimeKeys[$dbk] = $data;
1865                 }
1866
1867                 // Hooks registered in the object
1868                 $parserOutputHooks = $this->getConfig()->get( 'ParserOutputHooks' );
1869                 foreach ( $parserOutput->getOutputHooks() as $hookInfo ) {
1870                         list( $hookName, $data ) = $hookInfo;
1871                         if ( isset( $parserOutputHooks[$hookName] ) ) {
1872                                 $parserOutputHooks[$hookName]( $this, $parserOutput, $data );
1873                         }
1874                 }
1875
1876                 // Enable OOUI if requested via ParserOutput
1877                 if ( $parserOutput->getEnableOOUI() ) {
1878                         $this->enableOOUI();
1879                 }
1880
1881                 // Include parser limit report
1882                 if ( !$this->limitReportJSData ) {
1883                         $this->limitReportJSData = $parserOutput->getLimitReportJSData();
1884                 }
1885
1886                 // Link flags are ignored for now, but may in the future be
1887                 // used to mark individual language links.
1888                 $linkFlags = [];
1889                 // Avoid PHP 7.1 warning of passing $this by reference
1890                 $outputPage = $this;
1891                 Hooks::run( 'LanguageLinks', [ $this->getTitle(), &$this->mLanguageLinks, &$linkFlags ] );
1892                 Hooks::runWithoutAbort( 'OutputPageParserOutput', [ &$outputPage, $parserOutput ] );
1893
1894                 // This check must be after 'OutputPageParserOutput' runs in addParserOutputMetadata
1895                 // so that extensions may modify ParserOutput to toggle TOC.
1896                 // This cannot be moved to addParserOutputText because that is not
1897                 // called by EditPage for Preview.
1898                 if ( $parserOutput->getTOCHTML() ) {
1899                         $this->mEnableTOC = true;
1900                 }
1901         }
1902
1903         /**
1904          * Add the HTML and enhancements for it (like ResourceLoader modules) associated with a
1905          * ParserOutput object, without any other metadata.
1906          *
1907          * @since 1.24
1908          * @param ParserOutput $parserOutput
1909          * @param array $poOptions Options to ParserOutput::getText()
1910          */
1911         public function addParserOutputContent( ParserOutput $parserOutput, $poOptions = [] ) {
1912                 $this->addParserOutputText( $parserOutput, $poOptions );
1913
1914                 $this->addModules( $parserOutput->getModules() );
1915                 $this->addModuleScripts( $parserOutput->getModuleScripts() );
1916                 $this->addModuleStyles( $parserOutput->getModuleStyles() );
1917
1918                 $this->addJsConfigVars( $parserOutput->getJsConfigVars() );
1919         }
1920
1921         /**
1922          * Add the HTML associated with a ParserOutput object, without any metadata.
1923          *
1924          * @since 1.24
1925          * @param ParserOutput $parserOutput
1926          * @param array $poOptions Options to ParserOutput::getText()
1927          */
1928         public function addParserOutputText( ParserOutput $parserOutput, $poOptions = [] ) {
1929                 $text = $parserOutput->getText( $poOptions );
1930                 // Avoid PHP 7.1 warning of passing $this by reference
1931                 $outputPage = $this;
1932                 Hooks::runWithoutAbort( 'OutputPageBeforeHTML', [ &$outputPage, &$text ] );
1933                 $this->addHTML( $text );
1934         }
1935
1936         /**
1937          * Add everything from a ParserOutput object.
1938          *
1939          * @param ParserOutput $parserOutput
1940          * @param array $poOptions Options to ParserOutput::getText()
1941          */
1942         function addParserOutput( ParserOutput $parserOutput, $poOptions = [] ) {
1943                 $this->addParserOutputMetadata( $parserOutput );
1944                 $this->addParserOutputText( $parserOutput, $poOptions );
1945         }
1946
1947         /**
1948          * Add the output of a QuickTemplate to the output buffer
1949          *
1950          * @param QuickTemplate &$template
1951          */
1952         public function addTemplate( &$template ) {
1953                 $this->addHTML( $template->getHTML() );
1954         }
1955
1956         /**
1957          * Parse wikitext and return the HTML.
1958          *
1959          * @param string $text
1960          * @param bool $linestart Is this the start of a line?
1961          * @param bool $interface Use interface language (instead of content language) while parsing
1962          *   language sensitive magic words like GRAMMAR and PLURAL.  This also disables
1963          *   LanguageConverter.
1964          * @param Language|null $language Target language object, will override $interface
1965          * @throws MWException
1966          * @return string HTML
1967          */
1968         public function parse( $text, $linestart = true, $interface = false, $language = null ) {
1969                 global $wgParser;
1970
1971                 if ( is_null( $this->getTitle() ) ) {
1972                         throw new MWException( 'Empty $mTitle in ' . __METHOD__ );
1973                 }
1974
1975                 $popts = $this->parserOptions();
1976                 if ( $interface ) {
1977                         $popts->setInterfaceMessage( true );
1978                 }
1979                 if ( $language !== null ) {
1980                         $oldLang = $popts->setTargetLanguage( $language );
1981                 }
1982
1983                 $parserOutput = $wgParser->getFreshParser()->parse(
1984                         $text, $this->getTitle(), $popts,
1985                         $linestart, true, $this->mRevisionId
1986                 );
1987
1988                 if ( $interface ) {
1989                         $popts->setInterfaceMessage( false );
1990                 }
1991                 if ( $language !== null ) {
1992                         $popts->setTargetLanguage( $oldLang );
1993                 }
1994
1995                 return $parserOutput->getText( [
1996                         'enableSectionEditLinks' => false,
1997                 ] );
1998         }
1999
2000         /**
2001          * Parse wikitext, strip paragraphs, and return the HTML.
2002          *
2003          * @param string $text
2004          * @param bool $linestart Is this the start of a line?
2005          * @param bool $interface Use interface language (instead of content language) while parsing
2006          *   language sensitive magic words like GRAMMAR and PLURAL
2007          * @return string HTML
2008          */
2009         public function parseInline( $text, $linestart = true, $interface = false ) {
2010                 $parsed = $this->parse( $text, $linestart, $interface );
2011                 return Parser::stripOuterParagraph( $parsed );
2012         }
2013
2014         /**
2015          * Set the value of the "s-maxage" part of the "Cache-control" HTTP header
2016          *
2017          * @param int $maxage Maximum cache time on the CDN, in seconds.
2018          */
2019         public function setCdnMaxage( $maxage ) {
2020                 $this->mCdnMaxage = min( $maxage, $this->mCdnMaxageLimit );
2021         }
2022
2023         /**
2024          * Set the value of the "s-maxage" part of the "Cache-control" HTTP header to $maxage if that is
2025          * lower than the current s-maxage.  Either way, $maxage is now an upper limit on s-maxage, so
2026          * that future calls to setCdnMaxage() will no longer be able to raise the s-maxage above
2027          * $maxage.
2028          *
2029          * @param int $maxage Maximum cache time on the CDN, in seconds
2030          * @since 1.27
2031          */
2032         public function lowerCdnMaxage( $maxage ) {
2033                 $this->mCdnMaxageLimit = min( $maxage, $this->mCdnMaxageLimit );
2034                 $this->setCdnMaxage( $this->mCdnMaxage );
2035         }
2036
2037         /**
2038          * Get TTL in [$minTTL,$maxTTL] in pass it to lowerCdnMaxage()
2039          *
2040          * This sets and returns $minTTL if $mtime is false or null. Otherwise,
2041          * the TTL is higher the older the $mtime timestamp is. Essentially, the
2042          * TTL is 90% of the age of the object, subject to the min and max.
2043          *
2044          * @param string|int|float|bool|null $mtime Last-Modified timestamp
2045          * @param int $minTTL Minimum TTL in seconds [default: 1 minute]
2046          * @param int $maxTTL Maximum TTL in seconds [default: $wgSquidMaxage]
2047          * @return int TTL in seconds passed to lowerCdnMaxage() (may not be the same as the new
2048          *  s-maxage)
2049          * @since 1.28
2050          */
2051         public function adaptCdnTTL( $mtime, $minTTL = 0, $maxTTL = 0 ) {
2052                 $minTTL = $minTTL ?: IExpiringStore::TTL_MINUTE;
2053                 $maxTTL = $maxTTL ?: $this->getConfig()->get( 'SquidMaxage' );
2054
2055                 if ( $mtime === null || $mtime === false ) {
2056                         return $minTTL; // entity does not exist
2057                 }
2058
2059                 $age = time() - wfTimestamp( TS_UNIX, $mtime );
2060                 $adaptiveTTL = max( 0.9 * $age, $minTTL );
2061                 $adaptiveTTL = min( $adaptiveTTL, $maxTTL );
2062
2063                 $this->lowerCdnMaxage( (int)$adaptiveTTL );
2064
2065                 return $adaptiveTTL;
2066         }
2067
2068         /**
2069          * Use enableClientCache(false) to force it to send nocache headers
2070          *
2071          * @param bool|null $state New value, or null to not set the value
2072          *
2073          * @return bool Old value
2074          */
2075         public function enableClientCache( $state ) {
2076                 return wfSetVar( $this->mEnableClientCache, $state );
2077         }
2078
2079         /**
2080          * Get the list of cookie names that will influence the cache
2081          *
2082          * @return array
2083          */
2084         function getCacheVaryCookies() {
2085                 static $cookies;
2086                 if ( $cookies === null ) {
2087                         $config = $this->getConfig();
2088                         $cookies = array_merge(
2089                                 SessionManager::singleton()->getVaryCookies(),
2090                                 [
2091                                         'forceHTTPS',
2092                                 ],
2093                                 $config->get( 'CacheVaryCookies' )
2094                         );
2095                         Hooks::run( 'GetCacheVaryCookies', [ $this, &$cookies ] );
2096                 }
2097                 return $cookies;
2098         }
2099
2100         /**
2101          * Check if the request has a cache-varying cookie header
2102          * If it does, it's very important that we don't allow public caching
2103          *
2104          * @return bool
2105          */
2106         function haveCacheVaryCookies() {
2107                 $request = $this->getRequest();
2108                 foreach ( $this->getCacheVaryCookies() as $cookieName ) {
2109                         if ( $request->getCookie( $cookieName, '', '' ) !== '' ) {
2110                                 wfDebug( __METHOD__ . ": found $cookieName\n" );
2111                                 return true;
2112                         }
2113                 }
2114                 wfDebug( __METHOD__ . ": no cache-varying cookies found\n" );
2115                 return false;
2116         }
2117
2118         /**
2119          * Add an HTTP header that will influence on the cache
2120          *
2121          * @param string $header Header name
2122          * @param string[]|null $option Options for the Key header. See
2123          * https://datatracker.ietf.org/doc/draft-fielding-http-key/
2124          * for the list of valid options.
2125          */
2126         public function addVaryHeader( $header, array $option = null ) {
2127                 if ( !array_key_exists( $header, $this->mVaryHeader ) ) {
2128                         $this->mVaryHeader[$header] = [];
2129                 }
2130                 if ( !is_array( $option ) ) {
2131                         $option = [];
2132                 }
2133                 $this->mVaryHeader[$header] =
2134                         array_unique( array_merge( $this->mVaryHeader[$header], $option ) );
2135         }
2136
2137         /**
2138          * Return a Vary: header on which to vary caches. Based on the keys of $mVaryHeader,
2139          * such as Accept-Encoding or Cookie
2140          *
2141          * @return string
2142          */
2143         public function getVaryHeader() {
2144                 // If we vary on cookies, let's make sure it's always included here too.
2145                 if ( $this->getCacheVaryCookies() ) {
2146                         $this->addVaryHeader( 'Cookie' );
2147                 }
2148
2149                 foreach ( SessionManager::singleton()->getVaryHeaders() as $header => $options ) {
2150                         $this->addVaryHeader( $header, $options );
2151                 }
2152                 return 'Vary: ' . implode( ', ', array_keys( $this->mVaryHeader ) );
2153         }
2154
2155         /**
2156          * Add an HTTP Link: header
2157          *
2158          * @param string $header Header value
2159          */
2160         public function addLinkHeader( $header ) {
2161                 $this->mLinkHeader[] = $header;
2162         }
2163
2164         /**
2165          * Return a Link: header. Based on the values of $mLinkHeader.
2166          *
2167          * @return string
2168          */
2169         public function getLinkHeader() {
2170                 if ( !$this->mLinkHeader ) {
2171                         return false;
2172                 }
2173
2174                 return 'Link: ' . implode( ',', $this->mLinkHeader );
2175         }
2176
2177         /**
2178          * Get a complete Key header
2179          *
2180          * @return string
2181          */
2182         public function getKeyHeader() {
2183                 $cvCookies = $this->getCacheVaryCookies();
2184
2185                 $cookiesOption = [];
2186                 foreach ( $cvCookies as $cookieName ) {
2187                         $cookiesOption[] = 'param=' . $cookieName;
2188                 }
2189                 $this->addVaryHeader( 'Cookie', $cookiesOption );
2190
2191                 foreach ( SessionManager::singleton()->getVaryHeaders() as $header => $options ) {
2192                         $this->addVaryHeader( $header, $options );
2193                 }
2194
2195                 $headers = [];
2196                 foreach ( $this->mVaryHeader as $header => $option ) {
2197                         $newheader = $header;
2198                         if ( is_array( $option ) && count( $option ) > 0 ) {
2199                                 $newheader .= ';' . implode( ';', $option );
2200                         }
2201                         $headers[] = $newheader;
2202                 }
2203                 $key = 'Key: ' . implode( ',', $headers );
2204
2205                 return $key;
2206         }
2207
2208         /**
2209          * T23672: Add Accept-Language to Vary and Key headers if there's no 'variant' parameter in GET.
2210          *
2211          * For example:
2212          *   /w/index.php?title=Main_page will vary based on Accept-Language; but
2213          *   /w/index.php?title=Main_page&variant=zh-cn will not.
2214          */
2215         private function addAcceptLanguage() {
2216                 $title = $this->getTitle();
2217                 if ( !$title instanceof Title ) {
2218                         return;
2219                 }
2220
2221                 $lang = $title->getPageLanguage();
2222                 if ( !$this->getRequest()->getCheck( 'variant' ) && $lang->hasVariants() ) {
2223                         $variants = $lang->getVariants();
2224                         $aloption = [];
2225                         foreach ( $variants as $variant ) {
2226                                 if ( $variant === $lang->getCode() ) {
2227                                         continue;
2228                                 }
2229
2230                                 $aloption[] = "substr=$variant";
2231
2232                                 // IE and some other browsers use BCP 47 standards in their Accept-Language header,
2233                                 // like "zh-CN" or "zh-Hant".  We should handle these too.
2234                                 $variantBCP47 = LanguageCode::bcp47( $variant );
2235                                 if ( $variantBCP47 !== $variant ) {
2236                                         $aloption[] = "substr=$variantBCP47";
2237                                 }
2238                         }
2239                         $this->addVaryHeader( 'Accept-Language', $aloption );
2240                 }
2241         }
2242
2243         /**
2244          * Set a flag which will cause an X-Frame-Options header appropriate for
2245          * edit pages to be sent. The header value is controlled by
2246          * $wgEditPageFrameOptions.
2247          *
2248          * This is the default for special pages. If you display a CSRF-protected
2249          * form on an ordinary view page, then you need to call this function.
2250          *
2251          * @param bool $enable
2252          */
2253         public function preventClickjacking( $enable = true ) {
2254                 $this->mPreventClickjacking = $enable;
2255         }
2256
2257         /**
2258          * Turn off frame-breaking. Alias for $this->preventClickjacking(false).
2259          * This can be called from pages which do not contain any CSRF-protected
2260          * HTML form.
2261          */
2262         public function allowClickjacking() {
2263                 $this->mPreventClickjacking = false;
2264         }
2265
2266         /**
2267          * Get the prevent-clickjacking flag
2268          *
2269          * @since 1.24
2270          * @return bool
2271          */
2272         public function getPreventClickjacking() {
2273                 return $this->mPreventClickjacking;
2274         }
2275
2276         /**
2277          * Get the X-Frame-Options header value (without the name part), or false
2278          * if there isn't one. This is used by Skin to determine whether to enable
2279          * JavaScript frame-breaking, for clients that don't support X-Frame-Options.
2280          *
2281          * @return string|false
2282          */
2283         public function getFrameOptions() {
2284                 $config = $this->getConfig();
2285                 if ( $config->get( 'BreakFrames' ) ) {
2286                         return 'DENY';
2287                 } elseif ( $this->mPreventClickjacking && $config->get( 'EditPageFrameOptions' ) ) {
2288                         return $config->get( 'EditPageFrameOptions' );
2289                 }
2290                 return false;
2291         }
2292
2293         /**
2294          * Send cache control HTTP headers
2295          */
2296         public function sendCacheControl() {
2297                 $response = $this->getRequest()->response();
2298                 $config = $this->getConfig();
2299
2300                 $this->addVaryHeader( 'Cookie' );
2301                 $this->addAcceptLanguage();
2302
2303                 # don't serve compressed data to clients who can't handle it
2304                 # maintain different caches for logged-in users and non-logged in ones
2305                 $response->header( $this->getVaryHeader() );
2306
2307                 if ( $config->get( 'UseKeyHeader' ) ) {
2308                         $response->header( $this->getKeyHeader() );
2309                 }
2310
2311                 if ( $this->mEnableClientCache ) {
2312                         if (
2313                                 $config->get( 'UseSquid' ) &&
2314                                 !$response->hasCookies() &&
2315                                 !SessionManager::getGlobalSession()->isPersistent() &&
2316                                 !$this->isPrintable() &&
2317                                 $this->mCdnMaxage != 0 &&
2318                                 !$this->haveCacheVaryCookies()
2319                         ) {
2320                                 if ( $config->get( 'UseESI' ) ) {
2321                                         # We'll purge the proxy cache explicitly, but require end user agents
2322                                         # to revalidate against the proxy on each visit.
2323                                         # Surrogate-Control controls our CDN, Cache-Control downstream caches
2324                                         wfDebug( __METHOD__ .
2325                                                 ": proxy caching with ESI; {$this->mLastModified} **", 'private' );
2326                                         # start with a shorter timeout for initial testing
2327                                         # header( 'Surrogate-Control: max-age=2678400+2678400, content="ESI/1.0"');
2328                                         $response->header(
2329                                                 "Surrogate-Control: max-age={$config->get( 'SquidMaxage' )}" .
2330                                                 "+{$this->mCdnMaxage}, content=\"ESI/1.0\""
2331                                         );
2332                                         $response->header( 'Cache-Control: s-maxage=0, must-revalidate, max-age=0' );
2333                                 } else {
2334                                         # We'll purge the proxy cache for anons explicitly, but require end user agents
2335                                         # to revalidate against the proxy on each visit.
2336                                         # IMPORTANT! The CDN needs to replace the Cache-Control header with
2337                                         # Cache-Control: s-maxage=0, must-revalidate, max-age=0
2338                                         wfDebug( __METHOD__ .
2339                                                 ": local proxy caching; {$this->mLastModified} **", 'private' );
2340                                         # start with a shorter timeout for initial testing
2341                                         # header( "Cache-Control: s-maxage=2678400, must-revalidate, max-age=0" );
2342                                         $response->header( "Cache-Control: " .
2343                                                 "s-maxage={$this->mCdnMaxage}, must-revalidate, max-age=0" );
2344                                 }
2345                         } else {
2346                                 # We do want clients to cache if they can, but they *must* check for updates
2347                                 # on revisiting the page.
2348                                 wfDebug( __METHOD__ . ": private caching; {$this->mLastModified} **", 'private' );
2349                                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
2350                                 $response->header( "Cache-Control: private, must-revalidate, max-age=0" );
2351                         }
2352                         if ( $this->mLastModified ) {
2353                                 $response->header( "Last-Modified: {$this->mLastModified}" );
2354                         }
2355                 } else {
2356                         wfDebug( __METHOD__ . ": no caching **", 'private' );
2357
2358                         # In general, the absence of a last modified header should be enough to prevent
2359                         # the client from using its cache. We send a few other things just to make sure.
2360                         $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
2361                         $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
2362                         $response->header( 'Pragma: no-cache' );
2363                 }
2364         }
2365
2366         /**
2367          * Transfer styles and JavaScript modules from skin.
2368          *
2369          * @param Skin $sk to load modules for
2370          */
2371         public function loadSkinModules( $sk ) {
2372                 foreach ( $sk->getDefaultModules() as $group => $modules ) {
2373                         if ( $group === 'styles' ) {
2374                                 foreach ( $modules as $key => $moduleMembers ) {
2375                                         $this->addModuleStyles( $moduleMembers );
2376                                 }
2377                         } else {
2378                                 $this->addModules( $modules );
2379                         }
2380                 }
2381         }
2382
2383         /**
2384          * Finally, all the text has been munged and accumulated into
2385          * the object, let's actually output it:
2386          *
2387          * @param bool $return Set to true to get the result as a string rather than sending it
2388          * @return string|null
2389          * @throws Exception
2390          * @throws FatalError
2391          * @throws MWException
2392          */
2393         public function output( $return = false ) {
2394                 if ( $this->mDoNothing ) {
2395                         return $return ? '' : null;
2396                 }
2397
2398                 $response = $this->getRequest()->response();
2399                 $config = $this->getConfig();
2400
2401                 if ( $this->mRedirect != '' ) {
2402                         # Standards require redirect URLs to be absolute
2403                         $this->mRedirect = wfExpandUrl( $this->mRedirect, PROTO_CURRENT );
2404
2405                         $redirect = $this->mRedirect;
2406                         $code = $this->mRedirectCode;
2407
2408                         if ( Hooks::run( "BeforePageRedirect", [ $this, &$redirect, &$code ] ) ) {
2409                                 if ( $code == '301' || $code == '303' ) {
2410                                         if ( !$config->get( 'DebugRedirects' ) ) {
2411                                                 $response->statusHeader( $code );
2412                                         }
2413                                         $this->mLastModified = wfTimestamp( TS_RFC2822 );
2414                                 }
2415                                 if ( $config->get( 'VaryOnXFP' ) ) {
2416                                         $this->addVaryHeader( 'X-Forwarded-Proto' );
2417                                 }
2418                                 $this->sendCacheControl();
2419
2420                                 $response->header( "Content-Type: text/html; charset=utf-8" );
2421                                 if ( $config->get( 'DebugRedirects' ) ) {
2422                                         $url = htmlspecialchars( $redirect );
2423                                         print "<!DOCTYPE html>\n<html>\n<head>\n<title>Redirect</title>\n</head>\n<body>\n";
2424                                         print "<p>Location: <a href=\"$url\">$url</a></p>\n";
2425                                         print "</body>\n</html>\n";
2426                                 } else {
2427                                         $response->header( 'Location: ' . $redirect );
2428                                 }
2429                         }
2430
2431                         return $return ? '' : null;
2432                 } elseif ( $this->mStatusCode ) {
2433                         $response->statusHeader( $this->mStatusCode );
2434                 }
2435
2436                 # Buffer output; final headers may depend on later processing
2437                 ob_start();
2438
2439                 $response->header( 'Content-type: ' . $config->get( 'MimeType' ) . '; charset=UTF-8' );
2440                 $response->header( 'Content-language: ' .
2441                         MediaWikiServices::getInstance()->getContentLanguage()->getHtmlCode() );
2442
2443                 if ( !$this->mArticleBodyOnly ) {
2444                         $sk = $this->getSkin();
2445                 }
2446
2447                 $linkHeader = $this->getLinkHeader();
2448                 if ( $linkHeader ) {
2449                         $response->header( $linkHeader );
2450                 }
2451
2452                 // Prevent framing, if requested
2453                 $frameOptions = $this->getFrameOptions();
2454                 if ( $frameOptions ) {
2455                         $response->header( "X-Frame-Options: $frameOptions" );
2456                 }
2457
2458                 ContentSecurityPolicy::sendHeaders( $this );
2459
2460                 if ( $this->mArticleBodyOnly ) {
2461                         echo $this->mBodytext;
2462                 } else {
2463                         // Enable safe mode if requested (T152169)
2464                         if ( $this->getRequest()->getBool( 'safemode' ) ) {
2465                                 $this->disallowUserJs();
2466                         }
2467
2468                         $sk = $this->getSkin();
2469                         $this->loadSkinModules( $sk );
2470
2471                         MWDebug::addModules( $this );
2472
2473                         // Avoid PHP 7.1 warning of passing $this by reference
2474                         $outputPage = $this;
2475                         // Hook that allows last minute changes to the output page, e.g.
2476                         // adding of CSS or Javascript by extensions.
2477                         Hooks::runWithoutAbort( 'BeforePageDisplay', [ &$outputPage, &$sk ] );
2478
2479                         try {
2480                                 $sk->outputPage();
2481                         } catch ( Exception $e ) {
2482                                 ob_end_clean(); // bug T129657
2483                                 throw $e;
2484                         }
2485                 }
2486
2487                 try {
2488                         // This hook allows last minute changes to final overall output by modifying output buffer
2489                         Hooks::runWithoutAbort( 'AfterFinalPageOutput', [ $this ] );
2490                 } catch ( Exception $e ) {
2491                         ob_end_clean(); // bug T129657
2492                         throw $e;
2493                 }
2494
2495                 $this->sendCacheControl();
2496
2497                 if ( $return ) {
2498                         return ob_get_clean();
2499                 } else {
2500                         ob_end_flush();
2501                         return null;
2502                 }
2503         }
2504
2505         /**
2506          * Prepare this object to display an error page; disable caching and
2507          * indexing, clear the current text and redirect, set the page's title
2508          * and optionally an custom HTML title (content of the "<title>" tag).
2509          *
2510          * @param string|Message $pageTitle Will be passed directly to setPageTitle()
2511          * @param string|Message $htmlTitle Will be passed directly to setHTMLTitle();
2512          *                   optional, if not passed the "<title>" attribute will be
2513          *                   based on $pageTitle
2514          */
2515         public function prepareErrorPage( $pageTitle, $htmlTitle = false ) {
2516                 $this->setPageTitle( $pageTitle );
2517                 if ( $htmlTitle !== false ) {
2518                         $this->setHTMLTitle( $htmlTitle );
2519                 }
2520                 $this->setRobotPolicy( 'noindex,nofollow' );
2521                 $this->setArticleRelated( false );
2522                 $this->enableClientCache( false );
2523                 $this->mRedirect = '';
2524                 $this->clearSubtitle();
2525                 $this->clearHTML();
2526         }
2527
2528         /**
2529          * Output a standard error page
2530          *
2531          * showErrorPage( 'titlemsg', 'pagetextmsg' );
2532          * showErrorPage( 'titlemsg', 'pagetextmsg', [ 'param1', 'param2' ] );
2533          * showErrorPage( 'titlemsg', $messageObject );
2534          * showErrorPage( $titleMessageObject, $messageObject );
2535          *
2536          * @param string|Message $title Message key (string) for page title, or a Message object
2537          * @param string|Message $msg Message key (string) for page text, or a Message object
2538          * @param array $params Message parameters; ignored if $msg is a Message object
2539          */
2540         public function showErrorPage( $title, $msg, $params = [] ) {
2541                 if ( !$title instanceof Message ) {
2542                         $title = $this->msg( $title );
2543                 }
2544
2545                 $this->prepareErrorPage( $title );
2546
2547                 if ( $msg instanceof Message ) {
2548                         if ( $params !== [] ) {
2549                                 trigger_error( 'Argument ignored: $params. The message parameters argument '
2550                                         . 'is discarded when the $msg argument is a Message object instead of '
2551                                         . 'a string.', E_USER_NOTICE );
2552                         }
2553                         $this->addHTML( $msg->parseAsBlock() );
2554                 } else {
2555                         $this->addWikiMsgArray( $msg, $params );
2556                 }
2557
2558                 $this->returnToMain();
2559         }
2560
2561         /**
2562          * Output a standard permission error page
2563          *
2564          * @param array $errors Error message keys or [key, param...] arrays
2565          * @param string|null $action Action that was denied or null if unknown
2566          */
2567         public function showPermissionsErrorPage( array $errors, $action = null ) {
2568                 foreach ( $errors as $key => $error ) {
2569                         $errors[$key] = (array)$error;
2570                 }
2571
2572                 // For some action (read, edit, create and upload), display a "login to do this action"
2573                 // error if all of the following conditions are met:
2574                 // 1. the user is not logged in
2575                 // 2. the only error is insufficient permissions (i.e. no block or something else)
2576                 // 3. the error can be avoided simply by logging in
2577                 if ( in_array( $action, [ 'read', 'edit', 'createpage', 'createtalk', 'upload' ] )
2578                         && $this->getUser()->isAnon() && count( $errors ) == 1 && isset( $errors[0][0] )
2579                         && ( $errors[0][0] == 'badaccess-groups' || $errors[0][0] == 'badaccess-group0' )
2580                         && ( User::groupHasPermission( 'user', $action )
2581                         || User::groupHasPermission( 'autoconfirmed', $action ) )
2582                 ) {
2583                         $displayReturnto = null;
2584
2585                         # Due to T34276, if a user does not have read permissions,
2586                         # $this->getTitle() will just give Special:Badtitle, which is
2587                         # not especially useful as a returnto parameter. Use the title
2588                         # from the request instead, if there was one.
2589                         $request = $this->getRequest();
2590                         $returnto = Title::newFromText( $request->getVal( 'title', '' ) );
2591                         if ( $action == 'edit' ) {
2592                                 $msg = 'whitelistedittext';
2593                                 $displayReturnto = $returnto;
2594                         } elseif ( $action == 'createpage' || $action == 'createtalk' ) {
2595                                 $msg = 'nocreatetext';
2596                         } elseif ( $action == 'upload' ) {
2597                                 $msg = 'uploadnologintext';
2598                         } else { # Read
2599                                 $msg = 'loginreqpagetext';
2600                                 $displayReturnto = Title::newMainPage();
2601                         }
2602
2603                         $query = [];
2604
2605                         if ( $returnto ) {
2606                                 $query['returnto'] = $returnto->getPrefixedText();
2607
2608                                 if ( !$request->wasPosted() ) {
2609                                         $returntoquery = $request->getValues();
2610                                         unset( $returntoquery['title'] );
2611                                         unset( $returntoquery['returnto'] );
2612                                         unset( $returntoquery['returntoquery'] );
2613                                         $query['returntoquery'] = wfArrayToCgi( $returntoquery );
2614                                 }
2615                         }
2616                         $linkRenderer = MediaWikiServices::getInstance()->getLinkRenderer();
2617                         $loginLink = $linkRenderer->makeKnownLink(
2618                                 SpecialPage::getTitleFor( 'Userlogin' ),
2619                                 $this->msg( 'loginreqlink' )->text(),
2620                                 [],
2621                                 $query
2622                         );
2623
2624                         $this->prepareErrorPage( $this->msg( 'loginreqtitle' ) );
2625                         $this->addHTML( $this->msg( $msg )->rawParams( $loginLink )->parse() );
2626
2627                         # Don't return to a page the user can't read otherwise
2628                         # we'll end up in a pointless loop
2629                         if ( $displayReturnto && $displayReturnto->userCan( 'read', $this->getUser() ) ) {
2630                                 $this->returnToMain( null, $displayReturnto );
2631                         }
2632                 } else {
2633                         $this->prepareErrorPage( $this->msg( 'permissionserrors' ) );
2634                         $this->addWikiText( $this->formatPermissionsErrorMessage( $errors, $action ) );
2635                 }
2636         }
2637
2638         /**
2639          * Display an error page indicating that a given version of MediaWiki is
2640          * required to use it
2641          *
2642          * @param mixed $version The version of MediaWiki needed to use the page
2643          */
2644         public function versionRequired( $version ) {
2645                 $this->prepareErrorPage( $this->msg( 'versionrequired', $version ) );
2646
2647                 $this->addWikiMsg( 'versionrequiredtext', $version );
2648                 $this->returnToMain();
2649         }
2650
2651         /**
2652          * Format a list of error messages
2653          *
2654          * @param array $errors Array of arrays returned by Title::getUserPermissionsErrors
2655          * @param string|null $action Action that was denied or null if unknown
2656          * @return string The wikitext error-messages, formatted into a list.
2657          */
2658         public function formatPermissionsErrorMessage( array $errors, $action = null ) {
2659                 if ( $action == null ) {
2660                         $text = $this->msg( 'permissionserrorstext', count( $errors ) )->plain() . "\n\n";
2661                 } else {
2662                         $action_desc = $this->msg( "action-$action" )->plain();
2663                         $text = $this->msg(
2664                                 'permissionserrorstext-withaction',
2665                                 count( $errors ),
2666                                 $action_desc
2667                         )->plain() . "\n\n";
2668                 }
2669
2670                 if ( count( $errors ) > 1 ) {
2671                         $text .= '<ul class="permissions-errors">' . "\n";
2672
2673                         foreach ( $errors as $error ) {
2674                                 $text .= '<li>';
2675                                 $text .= $this->msg( ...$error )->plain();
2676                                 $text .= "</li>\n";
2677                         }
2678                         $text .= '</ul>';
2679                 } else {
2680                         $text .= "<div class=\"permissions-errors\">\n" .
2681                                         $this->msg( ...reset( $errors ) )->plain() .
2682                                         "\n</div>";
2683                 }
2684
2685                 return $text;
2686         }
2687
2688         /**
2689          * Show a warning about replica DB lag
2690          *
2691          * If the lag is higher than $wgSlaveLagCritical seconds,
2692          * then the warning is a bit more obvious. If the lag is
2693          * lower than $wgSlaveLagWarning, then no warning is shown.
2694          *
2695          * @param int $lag Slave lag
2696          */
2697         public function showLagWarning( $lag ) {
2698                 $config = $this->getConfig();
2699                 if ( $lag >= $config->get( 'SlaveLagWarning' ) ) {
2700                         $lag = floor( $lag ); // floor to avoid nano seconds to display
2701                         $message = $lag < $config->get( 'SlaveLagCritical' )
2702                                 ? 'lag-warn-normal'
2703                                 : 'lag-warn-high';
2704                         $wrap = Html::rawElement( 'div', [ 'class' => "mw-{$message}" ], "\n$1\n" );
2705                         $this->wrapWikiMsg( "$wrap\n", [ $message, $this->getLanguage()->formatNum( $lag ) ] );
2706                 }
2707         }
2708
2709         /**
2710          * Output an error page
2711          *
2712          * @note FatalError exception class provides an alternative.
2713          * @param string $message Error to output. Must be escaped for HTML.
2714          */
2715         public function showFatalError( $message ) {
2716                 $this->prepareErrorPage( $this->msg( 'internalerror' ) );
2717
2718                 $this->addHTML( $message );
2719         }
2720
2721         /**
2722          * @deprecated 1.32 Use OutputPage::showFatalError or throw FatalError instead.
2723          */
2724         public function showUnexpectedValueError( $name, $val ) {
2725                 wfDeprecated( __METHOD__, '1.32' );
2726                 $this->showFatalError( $this->msg( 'unexpected', $name, $val )->escaped() );
2727         }
2728
2729         /**
2730          * @deprecated 1.32 Use OutputPage::showFatalError or throw FatalError instead.
2731          */
2732         public function showFileCopyError( $old, $new ) {
2733                 wfDeprecated( __METHOD__, '1.32' );
2734                 $this->showFatalError( $this->msg( 'filecopyerror', $old, $new )->escaped() );
2735         }
2736
2737         /**
2738          * @deprecated 1.32 Use OutputPage::showFatalError or throw FatalError instead.
2739          */
2740         public function showFileRenameError( $old, $new ) {
2741                 wfDeprecated( __METHOD__, '1.32' );
2742                 $this->showFatalError( $this->msg( 'filerenameerror', $old, $new )->escpaed() );
2743         }
2744
2745         /**
2746          * @deprecated 1.32 Use OutputPage::showFatalError or throw FatalError instead.
2747          */
2748         public function showFileDeleteError( $name ) {
2749                 wfDeprecated( __METHOD__, '1.32' );
2750                 $this->showFatalError( $this->msg( 'filedeleteerror', $name )->escaped() );
2751         }
2752
2753         /**
2754          * @deprecated 1.32 Use OutputPage::showFatalError or throw FatalError instead.
2755          */
2756         public function showFileNotFoundError( $name ) {
2757                 wfDeprecated( __METHOD__, '1.32' );
2758                 $this->showFatalError( $this->msg( 'filenotfound', $name )->escaped() );
2759         }
2760
2761         /**
2762          * Add a "return to" link pointing to a specified title
2763          *
2764          * @param Title $title Title to link
2765          * @param array $query Query string parameters
2766          * @param string|null $text Text of the link (input is not escaped)
2767          * @param array $options Options array to pass to Linker
2768          */
2769         public function addReturnTo( $title, array $query = [], $text = null, $options = [] ) {
2770                 $linkRenderer = MediaWikiServices::getInstance()
2771                         ->getLinkRendererFactory()->createFromLegacyOptions( $options );
2772                 $link = $this->msg( 'returnto' )->rawParams(
2773                         $linkRenderer->makeLink( $title, $text, [], $query ) )->escaped();
2774                 $this->addHTML( "<p id=\"mw-returnto\">{$link}</p>\n" );
2775         }
2776
2777         /**
2778          * Add a "return to" link pointing to a specified title,
2779          * or the title indicated in the request, or else the main page
2780          *
2781          * @param mixed|null $unused
2782          * @param Title|string|null $returnto Title or String to return to
2783          * @param string|null $returntoquery Query string for the return to link
2784          */
2785         public function returnToMain( $unused = null, $returnto = null, $returntoquery = null ) {
2786                 if ( $returnto == null ) {
2787                         $returnto = $this->getRequest()->getText( 'returnto' );
2788                 }
2789
2790                 if ( $returntoquery == null ) {
2791                         $returntoquery = $this->getRequest()->getText( 'returntoquery' );
2792                 }
2793
2794                 if ( $returnto === '' ) {
2795                         $returnto = Title::newMainPage();
2796                 }
2797
2798                 if ( is_object( $returnto ) ) {
2799                         $titleObj = $returnto;
2800                 } else {
2801                         $titleObj = Title::newFromText( $returnto );
2802                 }
2803                 // We don't want people to return to external interwiki. That
2804                 // might potentially be used as part of a phishing scheme
2805                 if ( !is_object( $titleObj ) || $titleObj->isExternal() ) {
2806                         $titleObj = Title::newMainPage();
2807                 }
2808
2809                 $this->addReturnTo( $titleObj, wfCgiToArray( $returntoquery ) );
2810         }
2811
2812         private function getRlClientContext() {
2813                 if ( !$this->rlClientContext ) {
2814                         $query = ResourceLoader::makeLoaderQuery(
2815                                 [], // modules; not relevant
2816                                 $this->getLanguage()->getCode(),
2817                                 $this->getSkin()->getSkinName(),
2818                                 $this->getUser()->isLoggedIn() ? $this->getUser()->getName() : null,
2819                                 null, // version; not relevant
2820                                 ResourceLoader::inDebugMode(),
2821                                 null, // only; not relevant
2822                                 $this->isPrintable(),
2823                                 $this->getRequest()->getBool( 'handheld' )
2824                         );
2825                         $this->rlClientContext = new ResourceLoaderContext(
2826                                 $this->getResourceLoader(),
2827                                 new FauxRequest( $query )
2828                         );
2829                         if ( $this->contentOverrideCallbacks ) {
2830                                 $this->rlClientContext = new DerivativeResourceLoaderContext( $this->rlClientContext );
2831                                 $this->rlClientContext->setContentOverrideCallback( function ( Title $title ) {
2832                                         foreach ( $this->contentOverrideCallbacks as $callback ) {
2833                                                 $content = $callback( $title );
2834                                                 if ( $content !== null ) {
2835                                                         $text = ContentHandler::getContentText( $content );
2836                                                         if ( strpos( $text, '</script>' ) !== false ) {
2837                                                                 // Proactively replace this so that we can display a message
2838                                                                 // to the user, instead of letting it go to Html::inlineScript(),
2839                                                                 // where it would be considered a server-side issue.
2840                                                                 $titleFormatted = $title->getPrefixedText();
2841                                                                 $content = new JavaScriptContent(
2842                                                                         Xml::encodeJsCall( 'mw.log.error', [
2843                                                                                 "Cannot preview $titleFormatted due to script-closing tag."
2844                                                                         ] )
2845                                                                 );
2846                                                         }
2847                                                         return $content;
2848                                                 }
2849                                         }
2850                                         return null;
2851                                 } );
2852                         }
2853                 }
2854                 return $this->rlClientContext;
2855         }
2856
2857         /**
2858          * Call this to freeze the module queue and JS config and create a formatter.
2859          *
2860          * Depending on the Skin, this may get lazy-initialised in either headElement() or
2861          * getBottomScripts(). See SkinTemplate::prepareQuickTemplate(). Calling this too early may
2862          * cause unexpected side-effects since disallowUserJs() may be called at any time to change
2863          * the module filters retroactively. Skins and extension hooks may also add modules until very
2864          * late in the request lifecycle.
2865          *
2866          * @return ResourceLoaderClientHtml
2867          */
2868         public function getRlClient() {
2869                 if ( !$this->rlClient ) {
2870                         $context = $this->getRlClientContext();
2871                         $rl = $this->getResourceLoader();
2872                         $this->addModules( [
2873                                 'user',
2874                                 'user.options',
2875                                 'user.tokens',
2876                         ] );
2877                         $this->addModuleStyles( [
2878                                 'site.styles',
2879                                 'noscript',
2880                                 'user.styles',
2881                         ] );
2882                         $this->getSkin()->setupSkinUserCss( $this );
2883
2884                         // Prepare exempt modules for buildExemptModules()
2885                         $exemptGroups = [ 'site' => [], 'noscript' => [], 'private' => [], 'user' => [] ];
2886                         $exemptStates = [];
2887                         $moduleStyles = $this->getModuleStyles( /*filter*/ true );
2888
2889                         // Preload getTitleInfo for isKnownEmpty calls below and in ResourceLoaderClientHtml
2890                         // Separate user-specific batch for improved cache-hit ratio.
2891                         $userBatch = [ 'user.styles', 'user' ];
2892                         $siteBatch = array_diff( $moduleStyles, $userBatch );
2893                         $dbr = wfGetDB( DB_REPLICA );
2894                         ResourceLoaderWikiModule::preloadTitleInfo( $context, $dbr, $siteBatch );
2895                         ResourceLoaderWikiModule::preloadTitleInfo( $context, $dbr, $userBatch );
2896
2897                         // Filter out modules handled by buildExemptModules()
2898                         $moduleStyles = array_filter( $moduleStyles,
2899                                 function ( $name ) use ( $rl, $context, &$exemptGroups, &$exemptStates ) {
2900                                         $module = $rl->getModule( $name );
2901                                         if ( $module ) {
2902                                                 $group = $module->getGroup();
2903                                                 if ( isset( $exemptGroups[$group] ) ) {
2904                                                         $exemptStates[$name] = 'ready';
2905                                                         if ( !$module->isKnownEmpty( $context ) ) {
2906                                                                 // E.g. Don't output empty <styles>
2907                                                                 $exemptGroups[$group][] = $name;
2908                                                         }
2909                                                         return false;
2910                                                 }
2911                                         }
2912                                         return true;
2913                                 }
2914                         );
2915                         $this->rlExemptStyleModules = $exemptGroups;
2916
2917                         $rlClient = new ResourceLoaderClientHtml( $context, [
2918                                 'target' => $this->getTarget(),
2919                                 'nonce' => $this->getCSPNonce(),
2920                                 // When 'safemode', disallowUserJs(), or reduceAllowedModules() is used
2921                                 // to only restrict modules to ORIGIN_CORE (ie. disallow ORIGIN_USER), the list of
2922                                 // modules enqueud for loading on this page is filtered to just those.
2923                                 // However, to make sure we also apply the restriction to dynamic dependencies and
2924                                 // lazy-loaded modules at run-time on the client-side, pass 'safemode' down to the
2925                                 // StartupModule so that the client-side registry will not contain any restricted
2926                                 // modules either. (T152169, T185303)
2927                                 'safemode' => ( $this->getAllowedModules( ResourceLoaderModule::TYPE_COMBINED )
2928                                         <= ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL
2929                                 ) ? '1' : null,
2930                         ] );
2931                         $rlClient->setConfig( $this->getJSVars() );
2932                         $rlClient->setModules( $this->getModules( /*filter*/ true ) );
2933                         $rlClient->setModuleStyles( $moduleStyles );
2934                         $rlClient->setModuleScripts( $this->getModuleScripts( /*filter*/ true ) );
2935                         $rlClient->setExemptStates( $exemptStates );
2936                         $this->rlClient = $rlClient;
2937                 }
2938                 return $this->rlClient;
2939         }
2940
2941         /**
2942          * @param Skin $sk The given Skin
2943          * @param bool $includeStyle Unused
2944          * @return string The doctype, opening "<html>", and head element.
2945          */
2946         public function headElement( Skin $sk, $includeStyle = true ) {
2947                 $userdir = $this->getLanguage()->getDir();
2948                 $sitedir = MediaWikiServices::getInstance()->getContentLanguage()->getDir();
2949
2950                 $pieces = [];
2951                 $pieces[] = Html::htmlHeader( Sanitizer::mergeAttributes(
2952                         $this->getRlClient()->getDocumentAttributes(),
2953                         $sk->getHtmlElementAttributes()
2954                 ) );
2955                 $pieces[] = Html::openElement( 'head' );
2956
2957                 if ( $this->getHTMLTitle() == '' ) {
2958                         $this->setHTMLTitle( $this->msg( 'pagetitle', $this->getPageTitle() )->inContentLanguage() );
2959                 }
2960
2961                 if ( !Html::isXmlMimeType( $this->getConfig()->get( 'MimeType' ) ) ) {
2962                         // Add <meta charset="UTF-8">
2963                         // This should be before <title> since it defines the charset used by
2964                         // text including the text inside <title>.
2965                         // The spec recommends defining XHTML5's charset using the XML declaration
2966                         // instead of meta.
2967                         // Our XML declaration is output by Html::htmlHeader.
2968                         // https://html.spec.whatwg.org/multipage/semantics.html#attr-meta-http-equiv-content-type
2969                         // https://html.spec.whatwg.org/multipage/semantics.html#charset
2970                         $pieces[] = Html::element( 'meta', [ 'charset' => 'UTF-8' ] );
2971                 }
2972
2973                 $pieces[] = Html::element( 'title', null, $this->getHTMLTitle() );
2974                 $pieces[] = $this->getRlClient()->getHeadHtml();
2975                 $pieces[] = $this->buildExemptModules();
2976                 $pieces = array_merge( $pieces, array_values( $this->getHeadLinksArray() ) );
2977                 $pieces = array_merge( $pieces, array_values( $this->mHeadItems ) );
2978
2979                 // Use an IE conditional comment to serve the script only to old IE
2980                 $pieces[] = '<!--[if lt IE 9]>' .
2981                         ResourceLoaderClientHtml::makeLoad(
2982                                 ResourceLoaderContext::newDummyContext(),
2983                                 [ 'html5shiv' ],
2984                                 ResourceLoaderModule::TYPE_SCRIPTS,
2985                                 [ 'sync' => true ],
2986                                 $this->getCSPNonce()
2987                         ) .
2988                         '<![endif]-->';
2989
2990                 $pieces[] = Html::closeElement( 'head' );
2991
2992                 $bodyClasses = $this->mAdditionalBodyClasses;
2993                 $bodyClasses[] = 'mediawiki';
2994
2995                 # Classes for LTR/RTL directionality support
2996                 $bodyClasses[] = $userdir;
2997                 $bodyClasses[] = "sitedir-$sitedir";
2998
2999                 $underline = $this->getUser()->getOption( 'underline' );
3000                 if ( $underline < 2 ) {
3001                         // The following classes can be used here:
3002                         // * mw-underline-always
3003                         // * mw-underline-never
3004                         $bodyClasses[] = 'mw-underline-' . ( $underline ? 'always' : 'never' );
3005                 }
3006
3007                 if ( $this->getLanguage()->capitalizeAllNouns() ) {
3008                         # A <body> class is probably not the best way to do this . . .
3009                         $bodyClasses[] = 'capitalize-all-nouns';
3010                 }
3011
3012                 // Parser feature migration class
3013                 // The idea is that this will eventually be removed, after the wikitext
3014                 // which requires it is cleaned up.
3015                 $bodyClasses[] = 'mw-hide-empty-elt';
3016
3017                 $bodyClasses[] = $sk->getPageClasses( $this->getTitle() );
3018                 $bodyClasses[] = 'skin-' . Sanitizer::escapeClass( $sk->getSkinName() );
3019                 $bodyClasses[] =
3020                         'action-' . Sanitizer::escapeClass( Action::getActionName( $this->getContext() ) );
3021
3022                 $bodyAttrs = [];
3023                 // While the implode() is not strictly needed, it's used for backwards compatibility
3024                 // (this used to be built as a string and hooks likely still expect that).
3025                 $bodyAttrs['class'] = implode( ' ', $bodyClasses );
3026
3027                 // Allow skins and extensions to add body attributes they need
3028                 $sk->addToBodyAttributes( $this, $bodyAttrs );
3029                 Hooks::run( 'OutputPageBodyAttributes', [ $this, $sk, &$bodyAttrs ] );
3030
3031                 $pieces[] = Html::openElement( 'body', $bodyAttrs );
3032
3033                 return self::combineWrappedStrings( $pieces );
3034         }
3035
3036         /**
3037          * Get a ResourceLoader object associated with this OutputPage
3038          *
3039          * @return ResourceLoader
3040          */
3041         public function getResourceLoader() {
3042                 if ( is_null( $this->mResourceLoader ) ) {
3043                         $this->mResourceLoader = new ResourceLoader(
3044                                 $this->getConfig(),
3045                                 LoggerFactory::getInstance( 'resourceloader' )
3046                         );
3047                 }
3048                 return $this->mResourceLoader;
3049         }
3050
3051         /**
3052          * Explicily load or embed modules on a page.
3053          *
3054          * @param array|string $modules One or more module names
3055          * @param string $only ResourceLoaderModule TYPE_ class constant
3056          * @param array $extraQuery [optional] Array with extra query parameters for the request
3057          * @return string|WrappedStringList HTML
3058          */
3059         public function makeResourceLoaderLink( $modules, $only, array $extraQuery = [] ) {
3060                 // Apply 'target' and 'origin' filters
3061                 $modules = $this->filterModules( (array)$modules, null, $only );
3062
3063                 return ResourceLoaderClientHtml::makeLoad(
3064                         $this->getRlClientContext(),
3065                         $modules,
3066                         $only,
3067                         $extraQuery,
3068                         $this->getCSPNonce()
3069                 );
3070         }
3071
3072         /**
3073          * Combine WrappedString chunks and filter out empty ones
3074          *
3075          * @param array $chunks
3076          * @return string|WrappedStringList HTML
3077          */
3078         protected static function combineWrappedStrings( array $chunks ) {
3079                 // Filter out empty values
3080                 $chunks = array_filter( $chunks, 'strlen' );
3081                 return WrappedString::join( "\n", $chunks );
3082         }
3083
3084         /**
3085          * JS stuff to put at the bottom of the `<body>`.
3086          * These are legacy scripts ($this->mScripts), and user JS.
3087          *
3088          * @return string|WrappedStringList HTML
3089          */
3090         public function getBottomScripts() {
3091                 $chunks = [];
3092                 $chunks[] = $this->getRlClient()->getBodyHtml();
3093
3094                 // Legacy non-ResourceLoader scripts
3095                 $chunks[] = $this->mScripts;
3096
3097                 if ( $this->limitReportJSData ) {
3098                         $chunks[] = ResourceLoader::makeInlineScript(
3099                                 ResourceLoader::makeConfigSetScript(
3100                                         [ 'wgPageParseReport' => $this->limitReportJSData ]
3101                                 ),
3102                                 $this->getCSPNonce()
3103                         );
3104                 }
3105
3106                 return self::combineWrappedStrings( $chunks );
3107         }
3108
3109         /**
3110          * Get the javascript config vars to include on this page
3111          *
3112          * @return array Array of javascript config vars
3113          * @since 1.23
3114          */
3115         public function getJsConfigVars() {
3116                 return $this->mJsConfigVars;
3117         }
3118
3119         /**
3120          * Add one or more variables to be set in mw.config in JavaScript
3121          *
3122          * @param string|array $keys Key or array of key/value pairs
3123          * @param mixed|null $value [optional] Value of the configuration variable
3124          */
3125         public function addJsConfigVars( $keys, $value = null ) {
3126                 if ( is_array( $keys ) ) {
3127                         foreach ( $keys as $key => $value ) {
3128                                 $this->mJsConfigVars[$key] = $value;
3129                         }
3130                         return;
3131                 }
3132
3133                 $this->mJsConfigVars[$keys] = $value;
3134         }
3135
3136         /**
3137          * Get an array containing the variables to be set in mw.config in JavaScript.
3138          *
3139          * Do not add things here which can be evaluated in ResourceLoaderStartUpModule
3140          * - in other words, page-independent/site-wide variables (without state).
3141          * You will only be adding bloat to the html page and causing page caches to
3142          * have to be purged on configuration changes.
3143          * @return array
3144          */
3145         public function getJSVars() {
3146                 $curRevisionId = 0;
3147                 $articleId = 0;
3148                 $canonicalSpecialPageName = false; # T23115
3149                 $services = MediaWikiServices::getInstance();
3150
3151                 $title = $this->getTitle();
3152                 $ns = $title->getNamespace();
3153                 $canonicalNamespace = MWNamespace::exists( $ns )
3154                         ? MWNamespace::getCanonicalName( $ns )
3155                         : $title->getNsText();
3156
3157                 $sk = $this->getSkin();
3158                 // Get the relevant title so that AJAX features can use the correct page name
3159                 // when making API requests from certain special pages (T36972).
3160                 $relevantTitle = $sk->getRelevantTitle();
3161                 $relevantUser = $sk->getRelevantUser();
3162
3163                 if ( $ns == NS_SPECIAL ) {
3164                         list( $canonicalSpecialPageName, /*...*/ ) =
3165                                 $services->getSpecialPageFactory()->
3166                                         resolveAlias( $title->getDBkey() );
3167                 } elseif ( $this->canUseWikiPage() ) {
3168                         $wikiPage = $this->getWikiPage();
3169                         $curRevisionId = $wikiPage->getLatest();
3170                         $articleId = $wikiPage->getId();
3171                 }
3172
3173                 $lang = $title->getPageViewLanguage();
3174
3175                 // Pre-process information
3176                 $separatorTransTable = $lang->separatorTransformTable();
3177                 $separatorTransTable = $separatorTransTable ?: [];
3178                 $compactSeparatorTransTable = [
3179                         implode( "\t", array_keys( $separatorTransTable ) ),
3180                         implode( "\t", $separatorTransTable ),
3181                 ];
3182                 $digitTransTable = $lang->digitTransformTable();
3183                 $digitTransTable = $digitTransTable ?: [];
3184                 $compactDigitTransTable = [
3185                         implode( "\t", array_keys( $digitTransTable ) ),
3186                         implode( "\t", $digitTransTable ),
3187                 ];
3188
3189                 $user = $this->getUser();
3190
3191                 $vars = [
3192                         'wgCanonicalNamespace' => $canonicalNamespace,
3193                         'wgCanonicalSpecialPageName' => $canonicalSpecialPageName,
3194                         'wgNamespaceNumber' => $title->getNamespace(),
3195                         'wgPageName' => $title->getPrefixedDBkey(),
3196                         'wgTitle' => $title->getText(),
3197                         'wgCurRevisionId' => $curRevisionId,
3198                         'wgRevisionId' => (int)$this->getRevisionId(),
3199                         'wgArticleId' => $articleId,
3200                         'wgIsArticle' => $this->isArticle(),
3201                         'wgIsRedirect' => $title->isRedirect(),
3202                         'wgAction' => Action::getActionName( $this->getContext() ),
3203                         'wgUserName' => $user->isAnon() ? null : $user->getName(),
3204                         'wgUserGroups' => $user->getEffectiveGroups(),
3205                         'wgCategories' => $this->getCategories(),
3206                         'wgBreakFrames' => $this->getFrameOptions() == 'DENY',
3207                         'wgPageContentLanguage' => $lang->getCode(),
3208                         'wgPageContentModel' => $title->getContentModel(),
3209                         'wgSeparatorTransformTable' => $compactSeparatorTransTable,
3210                         'wgDigitTransformTable' => $compactDigitTransTable,
3211                         'wgDefaultDateFormat' => $lang->getDefaultDateFormat(),
3212                         'wgMonthNames' => $lang->getMonthNamesArray(),
3213                         'wgMonthNamesShort' => $lang->getMonthAbbreviationsArray(),
3214                         'wgRelevantPageName' => $relevantTitle->getPrefixedDBkey(),
3215                         'wgRelevantArticleId' => $relevantTitle->getArticleID(),
3216                         'wgRequestId' => WebRequest::getRequestId(),
3217                         'wgCSPNonce' => $this->getCSPNonce(),
3218                 ];
3219
3220                 if ( $user->isLoggedIn() ) {
3221                         $vars['wgUserId'] = $user->getId();
3222                         $vars['wgUserEditCount'] = $user->getEditCount();
3223                         $userReg = $user->getRegistration();
3224                         $vars['wgUserRegistration'] = $userReg ? wfTimestamp( TS_UNIX, $userReg ) * 1000 : null;
3225                         // Get the revision ID of the oldest new message on the user's talk
3226                         // page. This can be used for constructing new message alerts on
3227                         // the client side.
3228                         $vars['wgUserNewMsgRevisionId'] = $user->getNewMessageRevisionId();
3229                 }
3230
3231                 $contLang = $services->getContentLanguage();
3232                 if ( $contLang->hasVariants() ) {
3233                         $vars['wgUserVariant'] = $contLang->getPreferredVariant();
3234                 }
3235                 // Same test as SkinTemplate
3236                 $vars['wgIsProbablyEditable'] = $title->quickUserCan( 'edit', $user )
3237                         && ( $title->exists() || $title->quickUserCan( 'create', $user ) );
3238
3239                 $vars['wgRelevantPageIsProbablyEditable'] = $relevantTitle
3240                         && $relevantTitle->quickUserCan( 'edit', $user )
3241                         && ( $relevantTitle->exists() || $relevantTitle->quickUserCan( 'create', $user ) );
3242
3243                 foreach ( $title->getRestrictionTypes() as $type ) {
3244                         // Following keys are set in $vars:
3245                         // wgRestrictionCreate, wgRestrictionEdit, wgRestrictionMove, wgRestrictionUpload
3246                         $vars['wgRestriction' . ucfirst( $type )] = $title->getRestrictions( $type );
3247                 }
3248
3249                 if ( $title->isMainPage() ) {
3250                         $vars['wgIsMainPage'] = true;
3251                 }
3252
3253                 if ( $this->mRedirectedFrom ) {
3254                         $vars['wgRedirectedFrom'] = $this->mRedirectedFrom->getPrefixedDBkey();
3255                 }
3256
3257                 if ( $relevantUser ) {
3258                         $vars['wgRelevantUserName'] = $relevantUser->getName();
3259                 }
3260
3261                 // Allow extensions to add their custom variables to the mw.config map.
3262                 // Use the 'ResourceLoaderGetConfigVars' hook if the variable is not
3263                 // page-dependant but site-wide (without state).
3264                 // Alternatively, you may want to use OutputPage->addJsConfigVars() instead.
3265                 Hooks::run( 'MakeGlobalVariablesScript', [ &$vars, $this ] );
3266
3267                 // Merge in variables from addJsConfigVars last
3268                 return array_merge( $vars, $this->getJsConfigVars() );
3269         }
3270
3271         /**
3272          * To make it harder for someone to slip a user a fake
3273          * JavaScript or CSS preview, a random token
3274          * is associated with the login session. If it's not
3275          * passed back with the preview request, we won't render
3276          * the code.
3277          *
3278          * @return bool
3279          */
3280         public function userCanPreview() {
3281                 $request = $this->getRequest();
3282                 if (
3283                         $request->getVal( 'action' ) !== 'submit' ||
3284                         !$request->wasPosted()
3285                 ) {
3286                         return false;
3287                 }
3288
3289                 $user = $this->getUser();
3290
3291                 if ( !$user->isLoggedIn() ) {
3292                         // Anons have predictable edit tokens
3293                         return false;
3294                 }
3295                 if ( !$user->matchEditToken( $request->getVal( 'wpEditToken' ) ) ) {
3296                         return false;
3297                 }
3298
3299                 $title = $this->getTitle();
3300                 $errors = $title->getUserPermissionsErrors( 'edit', $user );
3301                 if ( count( $errors ) !== 0 ) {
3302                         return false;
3303                 }
3304
3305                 return true;
3306         }
3307
3308         /**
3309          * @return array Array in format "link name or number => 'link html'".
3310          */
3311         public function getHeadLinksArray() {
3312                 global $wgVersion;
3313
3314                 $tags = [];
3315                 $config = $this->getConfig();
3316
3317                 $canonicalUrl = $this->mCanonicalUrl;
3318
3319                 $tags['meta-generator'] = Html::element( 'meta', [
3320                         'name' => 'generator',
3321                         'content' => "MediaWiki $wgVersion",
3322                 ] );
3323
3324                 if ( $config->get( 'ReferrerPolicy' ) !== false ) {
3325                         // Per https://w3c.github.io/webappsec-referrer-policy/#unknown-policy-values
3326                         // fallbacks should come before the primary value so we need to reverse the array.
3327                         foreach ( array_reverse( (array)$config->get( 'ReferrerPolicy' ) ) as $i => $policy ) {
3328                                 $tags["meta-referrer-$i"] = Html::element( 'meta', [
3329                                         'name' => 'referrer',
3330                                         'content' => $policy,
3331                                 ] );
3332                         }
3333                 }
3334
3335                 $p = "{$this->mIndexPolicy},{$this->mFollowPolicy}";
3336                 if ( $p !== 'index,follow' ) {
3337                         // http://www.robotstxt.org/wc/meta-user.html
3338                         // Only show if it's different from the default robots policy
3339                         $tags['meta-robots'] = Html::element( 'meta', [
3340                                 'name' => 'robots',
3341                                 'content' => $p,
3342                         ] );
3343                 }
3344
3345                 foreach ( $this->mMetatags as $tag ) {
3346                         if ( strncasecmp( $tag[0], 'http:', 5 ) === 0 ) {
3347                                 $a = 'http-equiv';
3348                                 $tag[0] = substr( $tag[0], 5 );
3349                         } elseif ( strncasecmp( $tag[0], 'og:', 3 ) === 0 ) {
3350                                 $a = 'property';
3351                         } else {
3352                                 $a = 'name';
3353                         }
3354                         $tagName = "meta-{$tag[0]}";
3355                         if ( isset( $tags[$tagName] ) ) {
3356                                 $tagName .= $tag[1];
3357                         }
3358                         $tags[$tagName] = Html::element( 'meta',
3359                                 [
3360                                         $a => $tag[0],
3361                                         'content' => $tag[1]
3362                                 ]
3363                         );
3364                 }
3365
3366                 foreach ( $this->mLinktags as $tag ) {
3367                         $tags[] = Html::element( 'link', $tag );
3368                 }
3369
3370                 # Universal edit button
3371                 if ( $config->get( 'UniversalEditButton' ) && $this->isArticleRelated() ) {
3372                         $user = $this->getUser();
3373                         if ( $this->getTitle()->quickUserCan( 'edit', $user )
3374                                 && ( $this->getTitle()->exists() ||
3375                                         $this->getTitle()->quickUserCan( 'create', $user ) )
3376                         ) {
3377                                 // Original UniversalEditButton
3378                                 $msg = $this->msg( 'edit' )->text();
3379                                 $tags['universal-edit-button'] = Html::element( 'link', [
3380                                         'rel' => 'alternate',
3381                                         'type' => 'application/x-wiki',
3382                                         'title' => $msg,
3383                                         'href' => $this->getTitle()->getEditURL(),
3384                                 ] );
3385                                 // Alternate edit link
3386                                 $tags['alternative-edit'] = Html::element( 'link', [
3387                                         'rel' => 'edit',
3388                                         'title' => $msg,
3389                                         'href' => $this->getTitle()->getEditURL(),
3390                                 ] );
3391                         }
3392                 }
3393
3394                 # Generally the order of the favicon and apple-touch-icon links
3395                 # should not matter, but Konqueror (3.5.9 at least) incorrectly
3396                 # uses whichever one appears later in the HTML source. Make sure
3397                 # apple-touch-icon is specified first to avoid this.
3398                 if ( $config->get( 'AppleTouchIcon' ) !== false ) {
3399                         $tags['apple-touch-icon'] = Html::element( 'link', [
3400                                 'rel' => 'apple-touch-icon',
3401                                 'href' => $config->get( 'AppleTouchIcon' )
3402                         ] );
3403                 }
3404
3405                 if ( $config->get( 'Favicon' ) !== false ) {
3406                         $tags['favicon'] = Html::element( 'link', [
3407                                 'rel' => 'shortcut icon',
3408                                 'href' => $config->get( 'Favicon' )
3409                         ] );
3410                 }
3411
3412                 # OpenSearch description link
3413                 $tags['opensearch'] = Html::element( 'link', [
3414                         'rel' => 'search',
3415                         'type' => 'application/opensearchdescription+xml',
3416                         'href' => wfScript( 'opensearch_desc' ),
3417                         'title' => $this->msg( 'opensearch-desc' )->inContentLanguage()->text(),
3418                 ] );
3419
3420                 # Real Simple Discovery link, provides auto-discovery information
3421                 # for the MediaWiki API (and potentially additional custom API
3422                 # support such as WordPress or Twitter-compatible APIs for a
3423                 # blogging extension, etc)
3424                 $tags['rsd'] = Html::element( 'link', [
3425                         'rel' => 'EditURI',
3426                         'type' => 'application/rsd+xml',
3427                         // Output a protocol-relative URL here if $wgServer is protocol-relative.
3428                         // Whether RSD accepts relative or protocol-relative URLs is completely
3429                         // undocumented, though.
3430                         'href' => wfExpandUrl( wfAppendQuery(
3431                                 wfScript( 'api' ),
3432                                 [ 'action' => 'rsd' ] ),
3433                                 PROTO_RELATIVE
3434                         ),
3435                 ] );
3436
3437                 # Language variants
3438                 if ( !$config->get( 'DisableLangConversion' ) ) {
3439                         $lang = $this->getTitle()->getPageLanguage();
3440                         if ( $lang->hasVariants() ) {
3441                                 $variants = $lang->getVariants();
3442                                 foreach ( $variants as $variant ) {
3443                                         $tags["variant-$variant"] = Html::element( 'link', [
3444                                                 'rel' => 'alternate',
3445                                                 'hreflang' => LanguageCode::bcp47( $variant ),
3446                                                 'href' => $this->getTitle()->getLocalURL(
3447                                                         [ 'variant' => $variant ] )
3448                                                 ]
3449                                         );
3450                                 }
3451                                 # x-default link per https://support.google.com/webmasters/answer/189077?hl=en
3452                                 $tags["variant-x-default"] = Html::element( 'link', [
3453                                         'rel' => 'alternate',
3454                                         'hreflang' => 'x-default',
3455                                         'href' => $this->getTitle()->getLocalURL() ] );
3456                         }
3457                 }
3458
3459                 # Copyright
3460                 if ( $this->copyrightUrl !== null ) {
3461                         $copyright = $this->copyrightUrl;
3462                 } else {
3463                         $copyright = '';
3464                         if ( $config->get( 'RightsPage' ) ) {
3465                                 $copy = Title::newFromText( $config->get( 'RightsPage' ) );
3466
3467                                 if ( $copy ) {
3468                                         $copyright = $copy->getLocalURL();
3469                                 }
3470                         }
3471
3472                         if ( !$copyright && $config->get( 'RightsUrl' ) ) {
3473                                 $copyright = $config->get( 'RightsUrl' );
3474                         }
3475                 }
3476
3477                 if ( $copyright ) {
3478                         $tags['copyright'] = Html::element( 'link', [
3479                                 'rel' => 'license',
3480                                 'href' => $copyright ]
3481                         );
3482                 }
3483
3484                 # Feeds
3485                 if ( $config->get( 'Feed' ) ) {
3486                         $feedLinks = [];
3487
3488                         foreach ( $this->getSyndicationLinks() as $format => $link ) {
3489                                 # Use the page name for the title.  In principle, this could
3490                                 # lead to issues with having the same name for different feeds
3491                                 # corresponding to the same page, but we can't avoid that at
3492                                 # this low a level.
3493
3494                                 $feedLinks[] = $this->feedLink(
3495                                         $format,
3496                                         $link,
3497                                         # Used messages: 'page-rss-feed' and 'page-atom-feed' (for an easier grep)
3498                                         $this->msg(
3499                                                 "page-{$format}-feed", $this->getTitle()->getPrefixedText()
3500                                         )->text()
3501                                 );
3502                         }
3503
3504                         # Recent changes feed should appear on every page (except recentchanges,
3505                         # that would be redundant). Put it after the per-page feed to avoid
3506                         # changing existing behavior. It's still available, probably via a
3507                         # menu in your browser. Some sites might have a different feed they'd
3508                         # like to promote instead of the RC feed (maybe like a "Recent New Articles"
3509                         # or "Breaking news" one). For this, we see if $wgOverrideSiteFeed is defined.
3510                         # If so, use it instead.
3511                         $sitename = $config->get( 'Sitename' );
3512                         if ( $config->get( 'OverrideSiteFeed' ) ) {
3513                                 foreach ( $config->get( 'OverrideSiteFeed' ) as $type => $feedUrl ) {
3514                                         // Note, this->feedLink escapes the url.
3515                                         $feedLinks[] = $this->feedLink(
3516                                                 $type,
3517                                                 $feedUrl,
3518                                                 $this->msg( "site-{$type}-feed", $sitename )->text()
3519                                         );
3520                                 }
3521                         } elseif ( !$this->getTitle()->isSpecial( 'Recentchanges' ) ) {
3522                                 $rctitle = SpecialPage::getTitleFor( 'Recentchanges' );
3523                                 foreach ( $config->get( 'AdvertisedFeedTypes' ) as $format ) {
3524                                         $feedLinks[] = $this->feedLink(
3525                                                 $format,
3526                                                 $rctitle->getLocalURL( [ 'feed' => $format ] ),
3527                                                 # For grep: 'site-rss-feed', 'site-atom-feed'
3528                                                 $this->msg( "site-{$format}-feed", $sitename )->text()
3529                                         );
3530                                 }
3531                         }
3532
3533                         # Allow extensions to change the list pf feeds. This hook is primarily for changing,
3534                         # manipulating or removing existing feed tags. If you want to add new feeds, you should
3535                         # use OutputPage::addFeedLink() instead.
3536                         Hooks::run( 'AfterBuildFeedLinks', [ &$feedLinks ] );
3537
3538                         $tags += $feedLinks;
3539                 }
3540
3541                 # Canonical URL
3542                 if ( $config->get( 'EnableCanonicalServerLink' ) ) {
3543                         if ( $canonicalUrl !== false ) {
3544                                 $canonicalUrl = wfExpandUrl( $canonicalUrl, PROTO_CANONICAL );
3545                         } else {
3546                                 if ( $this->isArticleRelated() ) {
3547                                         // This affects all requests where "setArticleRelated" is true. This is
3548                                         // typically all requests that show content (query title, curid, oldid, diff),
3549                                         // and all wikipage actions (edit, delete, purge, info, history etc.).
3550                                         // It does not apply to File pages and Special pages.
3551                                         // 'history' and 'info' actions address page metadata rather than the page
3552                                         // content itself, so they may not be canonicalized to the view page url.
3553                                         // TODO: this ought to be better encapsulated in the Action class.
3554                                         $action = Action::getActionName( $this->getContext() );
3555                                         if ( in_array( $action, [ 'history', 'info' ] ) ) {
3556                                                 $query = "action={$action}";
3557                                         } else {
3558                                                 $query = '';
3559                                         }
3560                                         $canonicalUrl = $this->getTitle()->getCanonicalURL( $query );
3561                                 } else {
3562                                         $reqUrl = $this->getRequest()->getRequestURL();
3563                                         $canonicalUrl = wfExpandUrl( $reqUrl, PROTO_CANONICAL );
3564                                 }
3565                         }
3566                 }
3567                 if ( $canonicalUrl !== false ) {
3568                         $tags[] = Html::element( 'link', [
3569                                 'rel' => 'canonical',
3570                                 'href' => $canonicalUrl
3571                         ] );
3572                 }
3573
3574                 // Allow extensions to add, remove and/or otherwise manipulate these links
3575                 // If you want only to *add* <head> links, please use the addHeadItem()
3576                 // (or addHeadItems() for multiple items) method instead.
3577                 // This hook is provided as a last resort for extensions to modify these
3578                 // links before the output is sent to client.
3579                 Hooks::run( 'OutputPageAfterGetHeadLinksArray', [ &$tags, $this ] );
3580
3581                 return $tags;
3582         }
3583
3584         /**
3585          * Generate a "<link rel/>" for a feed.
3586          *
3587          * @param string $type Feed type
3588          * @param string $url URL to the feed
3589          * @param string $text Value of the "title" attribute
3590          * @return string HTML fragment
3591          */
3592         private function feedLink( $type, $url, $text ) {
3593                 return Html::element( 'link', [
3594                         'rel' => 'alternate',
3595                         'type' => "application/$type+xml",
3596                         'title' => $text,
3597                         'href' => $url ]
3598                 );
3599         }
3600
3601         /**
3602          * Add a local or specified stylesheet, with the given media options.
3603          * Internal use only. Use OutputPage::addModuleStyles() if possible.
3604          *
3605          * @param string $style URL to the file
3606          * @param string $media To specify a media type, 'screen', 'printable', 'handheld' or any.
3607          * @param string $condition For IE conditional comments, specifying an IE version
3608          * @param string $dir Set to 'rtl' or 'ltr' for direction-specific sheets
3609          */
3610         public function addStyle( $style, $media = '', $condition = '', $dir = '' ) {
3611                 $options = [];
3612                 if ( $media ) {
3613                         $options['media'] = $media;
3614                 }
3615                 if ( $condition ) {
3616                         $options['condition'] = $condition;
3617                 }
3618                 if ( $dir ) {
3619                         $options['dir'] = $dir;
3620                 }
3621                 $this->styles[$style] = $options;
3622         }
3623
3624         /**
3625          * Adds inline CSS styles
3626          * Internal use only. Use OutputPage::addModuleStyles() if possible.
3627          *
3628          * @param mixed $style_css Inline CSS
3629          * @param string $flip Set to 'flip' to flip the CSS if needed
3630          */
3631         public function addInlineStyle( $style_css, $flip = 'noflip' ) {
3632                 if ( $flip === 'flip' && $this->getLanguage()->isRTL() ) {
3633                         # If wanted, and the interface is right-to-left, flip the CSS
3634                         $style_css = CSSJanus::transform( $style_css, true, false );
3635                 }
3636                 $this->mInlineStyles .= Html::inlineStyle( $style_css );
3637         }
3638
3639         /**
3640          * Build exempt modules and legacy non-ResourceLoader styles.
3641          *
3642          * @return string|WrappedStringList HTML
3643          */
3644         protected function buildExemptModules() {
3645                 $chunks = [];
3646                 // Things that go after the ResourceLoaderDynamicStyles marker
3647                 $append = [];
3648
3649                 // We want site, private and user styles to override dynamically added styles from
3650                 // general modules, but we want dynamically added styles to override statically added
3651                 // style modules. So the order has to be:
3652                 // - page style modules (formatted by ResourceLoaderClientHtml::getHeadHtml())
3653                 // - dynamically loaded styles (added by mw.loader before ResourceLoaderDynamicStyles)
3654                 // - ResourceLoaderDynamicStyles marker
3655                 // - site/private/user styles
3656
3657                 // Add legacy styles added through addStyle()/addInlineStyle() here
3658                 $chunks[] = implode( '', $this->buildCssLinksArray() ) . $this->mInlineStyles;
3659
3660                 $chunks[] = Html::element(
3661                         'meta',
3662                         [ 'name' => 'ResourceLoaderDynamicStyles', 'content' => '' ]
3663                 );
3664
3665                 $separateReq = [ 'site.styles', 'user.styles' ];
3666                 foreach ( $this->rlExemptStyleModules as $group => $moduleNames ) {
3667                         // Combinable modules
3668                         $chunks[] = $this->makeResourceLoaderLink(
3669                                 array_diff( $moduleNames, $separateReq ),
3670                                 ResourceLoaderModule::TYPE_STYLES
3671                         );
3672
3673                         foreach ( array_intersect( $moduleNames, $separateReq ) as $name ) {
3674                                 // These require their own dedicated request in order to support "@import"
3675                                 // syntax, which is incompatible with concatenation. (T147667, T37562)
3676                                 $chunks[] = $this->makeResourceLoaderLink( $name,
3677                                         ResourceLoaderModule::TYPE_STYLES
3678                                 );
3679                         }
3680                 }
3681
3682                 return self::combineWrappedStrings( array_merge( $chunks, $append ) );
3683         }
3684
3685         /**
3686          * @return array
3687          */
3688         public function buildCssLinksArray() {
3689                 $links = [];
3690
3691                 foreach ( $this->styles as $file => $options ) {
3692                         $link = $this->styleLink( $file, $options );
3693                         if ( $link ) {
3694                                 $links[$file] = $link;
3695                         }
3696                 }
3697                 return $links;
3698         }
3699
3700         /**
3701          * Generate \<link\> tags for stylesheets
3702          *
3703          * @param string $style URL to the file
3704          * @param array $options Option, can contain 'condition', 'dir', 'media' keys
3705          * @return string HTML fragment
3706          */
3707         protected function styleLink( $style, array $options ) {
3708                 if ( isset( $options['dir'] ) ) {
3709                         if ( $this->getLanguage()->getDir() != $options['dir'] ) {
3710                                 return '';
3711                         }
3712                 }
3713
3714                 if ( isset( $options['media'] ) ) {
3715                         $media = self::transformCssMedia( $options['media'] );
3716                         if ( is_null( $media ) ) {
3717                                 return '';
3718                         }
3719                 } else {
3720                         $media = 'all';
3721                 }
3722
3723                 if ( substr( $style, 0, 1 ) == '/' ||
3724                         substr( $style, 0, 5 ) == 'http:' ||
3725                         substr( $style, 0, 6 ) == 'https:' ) {
3726                         $url = $style;
3727                 } else {
3728                         $config = $this->getConfig();
3729                         // Append file hash as query parameter
3730                         $url = self::transformResourcePath(
3731                                 $config,
3732                                 $config->get( 'StylePath' ) . '/' . $style
3733                         );
3734                 }
3735
3736                 $link = Html::linkedStyle( $url, $media );
3737
3738                 if ( isset( $options['condition'] ) ) {
3739                         $condition = htmlspecialchars( $options['condition'] );
3740                         $link = "<!--[if $condition]>$link<![endif]-->";
3741                 }
3742                 return $link;
3743         }
3744
3745         /**
3746          * Transform path to web-accessible static resource.
3747          *
3748          * This is used to add a validation hash as query string.
3749          * This aids various behaviors:
3750          *
3751          * - Put long Cache-Control max-age headers on responses for improved
3752          *   cache performance.
3753          * - Get the correct version of a file as expected by the current page.
3754          * - Instantly get the updated version of a file after deployment.
3755          *
3756          * Avoid using this for urls included in HTML as otherwise clients may get different
3757          * versions of a resource when navigating the site depending on when the page was cached.
3758          * If changes to the url propagate, this is not a problem (e.g. if the url is in
3759          * an external stylesheet).
3760          *
3761          * @since 1.27
3762          * @param Config $config
3763          * @param string $path Path-absolute URL to file (from document root, must start with "/")
3764          * @return string URL
3765          */
3766         public static function transformResourcePath( Config $config, $path ) {
3767                 global $IP;
3768
3769                 $localDir = $IP;
3770                 $remotePathPrefix = $config->get( 'ResourceBasePath' );
3771                 if ( $remotePathPrefix === '' ) {
3772                         // The configured base path is required to be empty string for
3773                         // wikis in the domain root
3774                         $remotePath = '/';
3775                 } else {
3776                         $remotePath = $remotePathPrefix;
3777                 }
3778                 if ( strpos( $path, $remotePath ) !== 0 || substr( $path, 0, 2 ) === '//' ) {
3779                         // - Path is outside wgResourceBasePath, ignore.
3780                         // - Path is protocol-relative. Fixes T155310. Not supported by RelPath lib.
3781                         return $path;
3782                 }
3783                 // For files in resources, extensions/ or skins/, ResourceBasePath is preferred here.
3784                 // For other misc files in $IP, we'll fallback to that as well. There is, however, a fourth
3785                 // supported dir/path pair in the configuration (wgUploadDirectory, wgUploadPath)
3786                 // which is not expected to be in wgResourceBasePath on CDNs. (T155146)
3787                 $uploadPath = $config->get( 'UploadPath' );
3788                 if ( strpos( $path, $uploadPath ) === 0 ) {
3789                         $localDir = $config->get( 'UploadDirectory' );
3790                         $remotePathPrefix = $remotePath = $uploadPath;
3791                 }
3792
3793                 $path = RelPath::getRelativePath( $path, $remotePath );
3794                 return self::transformFilePath( $remotePathPrefix, $localDir, $path );
3795         }
3796
3797         /**
3798          * Utility method for transformResourceFilePath().
3799          *
3800          * Caller is responsible for ensuring the file exists. Emits a PHP warning otherwise.
3801          *
3802          * @since 1.27
3803          * @param string $remotePathPrefix URL path prefix that points to $localPath
3804          * @param string $localPath File directory exposed at $remotePath
3805          * @param string $file Path to target file relative to $localPath
3806          * @return string URL
3807          */
3808         public static function transformFilePath( $remotePathPrefix, $localPath, $file ) {
3809                 $hash = md5_file( "$localPath/$file" );
3810                 if ( $hash === false ) {
3811                         wfLogWarning( __METHOD__ . ": Failed to hash $localPath/$file" );
3812                         $hash = '';
3813                 }
3814                 return "$remotePathPrefix/$file?" . substr( $hash, 0, 5 );
3815         }
3816
3817         /**
3818          * Transform "media" attribute based on request parameters
3819          *
3820          * @param string $media Current value of the "media" attribute
3821          * @return string Modified value of the "media" attribute, or null to skip
3822          * this stylesheet
3823          */
3824         public static function transformCssMedia( $media ) {
3825                 global $wgRequest;
3826
3827                 // https://www.w3.org/TR/css3-mediaqueries/#syntax
3828                 $screenMediaQueryRegex = '/^(?:only\s+)?screen\b/i';
3829
3830                 // Switch in on-screen display for media testing
3831                 $switches = [
3832                         'printable' => 'print',
3833                         'handheld' => 'handheld',
3834                 ];
3835                 foreach ( $switches as $switch => $targetMedia ) {
3836                         if ( $wgRequest->getBool( $switch ) ) {
3837                                 if ( $media == $targetMedia ) {
3838                                         $media = '';
3839                                 } elseif ( preg_match( $screenMediaQueryRegex, $media ) === 1 ) {
3840                                         /* This regex will not attempt to understand a comma-separated media_query_list
3841                                          *
3842                                          * Example supported values for $media:
3843                                          * 'screen', 'only screen', 'screen and (min-width: 982px)' ),
3844                                          * Example NOT supported value for $media:
3845                                          * '3d-glasses, screen, print and resolution > 90dpi'
3846                                          *
3847                                          * If it's a print request, we never want any kind of screen stylesheets
3848                                          * If it's a handheld request (currently the only other choice with a switch),
3849                                          * we don't want simple 'screen' but we might want screen queries that
3850                                          * have a max-width or something, so we'll pass all others on and let the
3851                                          * client do the query.
3852                                          */
3853                                         if ( $targetMedia == 'print' || $media == 'screen' ) {
3854                                                 return null;
3855                                         }
3856                                 }
3857                         }
3858                 }
3859
3860                 return $media;
3861         }
3862
3863         /**
3864          * Add a wikitext-formatted message to the output.
3865          * This is equivalent to:
3866          *
3867          *    $wgOut->addWikiText( wfMessage( ... )->plain() )
3868          */
3869         public function addWikiMsg( /*...*/ ) {
3870                 $args = func_get_args();
3871                 $name = array_shift( $args );
3872                 $this->addWikiMsgArray( $name, $args );
3873         }
3874
3875         /**
3876          * Add a wikitext-formatted message to the output.
3877          * Like addWikiMsg() except the parameters are taken as an array
3878          * instead of a variable argument list.
3879          *
3880          * @param string $name
3881          * @param array $args
3882          */
3883         public function addWikiMsgArray( $name, $args ) {
3884                 $this->addHTML( $this->msg( $name, $args )->parseAsBlock() );
3885         }
3886
3887         /**
3888          * This function takes a number of message/argument specifications, wraps them in
3889          * some overall structure, and then parses the result and adds it to the output.
3890          *
3891          * In the $wrap, $1 is replaced with the first message, $2 with the second,
3892          * and so on. The subsequent arguments may be either
3893          * 1) strings, in which case they are message names, or
3894          * 2) arrays, in which case, within each array, the first element is the message
3895          *    name, and subsequent elements are the parameters to that message.
3896          *
3897          * Don't use this for messages that are not in the user's interface language.
3898          *
3899          * For example:
3900          *
3901          *    $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>", 'some-error' );
3902          *
3903          * Is equivalent to:
3904          *
3905          *    $wgOut->addWikiText( "<div class='error'>\n"
3906          *        . wfMessage( 'some-error' )->plain() . "\n</div>" );
3907          *
3908          * The newline after the opening div is needed in some wikitext. See T21226.
3909          *
3910          * @param string $wrap
3911          */
3912         public function wrapWikiMsg( $wrap /*, ...*/ ) {
3913                 $msgSpecs = func_get_args();
3914                 array_shift( $msgSpecs );
3915                 $msgSpecs = array_values( $msgSpecs );
3916                 $s = $wrap;
3917                 foreach ( $msgSpecs as $n => $spec ) {
3918                         if ( is_array( $spec ) ) {
3919                                 $args = $spec;
3920                                 $name = array_shift( $args );
3921                                 if ( isset( $args['options'] ) ) {
3922                                         unset( $args['options'] );
3923                                         wfDeprecated(
3924                                                 'Adding "options" to ' . __METHOD__ . ' is no longer supported',
3925                                                 '1.20'
3926                                         );
3927                                 }
3928                         } else {
3929                                 $args = [];
3930                                 $name = $spec;
3931                         }
3932                         $s = str_replace( '$' . ( $n + 1 ), $this->msg( $name, $args )->plain(), $s );
3933                 }
3934                 $this->addWikiText( $s );
3935         }
3936
3937         /**
3938          * Whether the output has a table of contents
3939          * @return bool
3940          * @since 1.22
3941          */
3942         public function isTOCEnabled() {
3943                 return $this->mEnableTOC;
3944         }
3945
3946         /**
3947          * Enables/disables section edit links, doesn't override __NOEDITSECTION__
3948          * @param bool $flag
3949          * @since 1.23
3950          * @deprecated since 1.31, use $poOptions to addParserOutput() instead.
3951          */
3952         public function enableSectionEditLinks( $flag = true ) {
3953                 wfDeprecated( __METHOD__, '1.31' );
3954         }
3955
3956         /**
3957          * @return bool
3958          * @since 1.23
3959          * @deprecated since 1.31, use $poOptions to addParserOutput() instead.
3960          */
3961         public function sectionEditLinksEnabled() {
3962                 wfDeprecated( __METHOD__, '1.31' );
3963                 return true;
3964         }
3965
3966         /**
3967          * Helper function to setup the PHP implementation of OOUI to use in this request.
3968          *
3969          * @since 1.26
3970          * @param String $skinName The Skin name to determine the correct OOUI theme
3971          * @param String $dir Language direction
3972          */
3973         public static function setupOOUI( $skinName = 'default', $dir = 'ltr' ) {
3974                 $themes = ResourceLoaderOOUIModule::getSkinThemeMap();
3975                 $theme = $themes[$skinName] ?? $themes['default'];
3976                 // For example, 'OOUI\WikimediaUITheme'.
3977                 $themeClass = "OOUI\\{$theme}Theme";
3978                 OOUI\Theme::setSingleton( new $themeClass() );
3979                 OOUI\Element::setDefaultDir( $dir );
3980         }
3981
3982         /**
3983          * Add ResourceLoader module styles for OOUI and set up the PHP implementation of it for use with
3984          * MediaWiki and this OutputPage instance.
3985          *
3986          * @since 1.25
3987          */
3988         public function enableOOUI() {
3989                 self::setupOOUI(
3990                         strtolower( $this->getSkin()->getSkinName() ),
3991                         $this->getLanguage()->getDir()
3992                 );
3993                 $this->addModuleStyles( [
3994                         'oojs-ui-core.styles',
3995                         'oojs-ui.styles.indicators',
3996                         'oojs-ui.styles.textures',
3997                         'mediawiki.widgets.styles',
3998                         'oojs-ui.styles.icons-content',
3999                         'oojs-ui.styles.icons-alerts',
4000                         'oojs-ui.styles.icons-interactions',
4001                 ] );
4002         }
4003
4004         /**
4005          * Get (and set if not yet set) the CSP nonce.
4006          *
4007          * This value needs to be included in any <script> tags on the
4008          * page.
4009          *
4010          * @return string|bool Nonce or false to mean don't output nonce
4011          * @since 1.32
4012          */
4013         public function getCSPNonce() {
4014                 if ( !ContentSecurityPolicy::isNonceRequired( $this->getConfig() ) ) {
4015                         return false;
4016                 }
4017                 if ( $this->CSPNonce === null ) {
4018                         // XXX It might be expensive to generate randomness
4019                         // on every request, on Windows.
4020                         $rand = random_bytes( 15 );
4021                         $this->CSPNonce = base64_encode( $rand );
4022                 }
4023                 return $this->CSPNonce;
4024         }
4025
4026 }