includes/OutputPage.php

   1 <?php
   2 /**
   3  * Preparation for the final page rendering.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 use MediaWiki\Linker\LinkTarget;
  24 use MediaWiki\MediaWikiServices;
  25 use MediaWiki\Session\SessionManager;
  26 use Wikimedia\Rdbms\IResultWrapper;
  27 use Wikimedia\RelPath;
  28 use Wikimedia\WrappedString;
  29 use Wikimedia\WrappedStringList;
  30
  31 /**
  32  * This class should be covered by a general architecture document which does
  33  * not exist as of January 2011.  This is one of the Core classes and should
  34  * be read at least once by any new developers.
  35  *
  36  * This class is used to prepare the final rendering. A skin is then
  37  * applied to the output parameters (links, javascript, html, categories ...).
  38  *
  39  * @todo FIXME: Another class handles sending the whole page to the client.
  40  *
  41  * Some comments comes from a pairing session between Zak Greant and Antoine Musso
  42  * in November 2010.
  43  *
  44  * @todo document
  45  */
  46 class OutputPage extends ContextSource {
  47         /** @var array Should be private. Used with addMeta() which adds "<meta>" */
  48         protected $mMetatags = [];
  49
  50         /** @var array */
  51         protected $mLinktags = [];
  52
  53         /** @var bool */
  54         protected $mCanonicalUrl = false;
  55
  56         /**
  57          * @var string The contents of <h1> */
  58         private $mPageTitle = '';
  59
  60         /**
  61          * @var string The displayed title of the page. Different from page title
  62          * if overridden by display title magic word or hooks. Can contain safe
  63          * HTML. Different from page title which may contain messages such as
  64          * "Editing X" which is displayed in h1. This can be used for other places
  65          * where the page name is referred on the page.
  66          */
  67         private $displayTitle;
  68
  69         /**
  70          * @var string Contains all of the "<body>" content. Should be private we
  71          *   got set/get accessors and the append() method.
  72          */
  73         public $mBodytext = '';
  74
  75         /** @var string Stores contents of "<title>" tag */
  76         private $mHTMLtitle = '';
  77
  78         /**
  79          * @var bool Is the displayed content related to the source of the
  80          *   corresponding wiki article.
  81          */
  82         private $mIsArticle = false;
  83
  84         /** @var bool Stores "article flag" toggle. */
  85         private $mIsArticleRelated = true;
  86
  87         /** @var bool Is the content subject to copyright */
  88         private $mHasCopyright = false;
  89
  90         /**
  91          * @var bool We have to set isPrintable(). Some pages should
  92          * never be printed (ex: redirections).
  93          */
  94         private $mPrintable = false;
  95
  96         /**
  97          * @var array Contains the page subtitle. Special pages usually have some
  98          *   links here. Don't confuse with site subtitle added by skins.
  99          */
 100         private $mSubtitle = [];
 101
 102         /** @var string */
 103         public $mRedirect = '';
 104
 105         /** @var int */
 106         protected $mStatusCode;
 107
 108         /**
 109          * @var string Used for sending cache control.
 110          *   The whole caching system should probably be moved into its own class.
 111          */
 112         protected $mLastModified = '';
 113
 114         /** @var array */
 115         protected $mCategoryLinks = [];
 116
 117         /** @var array */
 118         protected $mCategories = [
 119                 'hidden' => [],
 120                 'normal' => [],
 121         ];
 122
 123         /** @var array */
 124         protected $mIndicators = [];
 125
 126         /** @var array Array of Interwiki Prefixed (non DB key) Titles (e.g. 'fr:Test page') */
 127         private $mLanguageLinks = [];
 128
 129         /**
 130          * Used for JavaScript (predates ResourceLoader)
 131          * @todo We should split JS / CSS.
 132          * mScripts content is inserted as is in "<head>" by Skin. This might
 133          * contain either a link to a stylesheet or inline CSS.
 134          */
 135         private $mScripts = '';
 136
 137         /** @var string Inline CSS styles. Use addInlineStyle() sparingly */
 138         protected $mInlineStyles = '';
 139
 140         /**
 141          * @var string Used by skin template.
 142          * Example: $tpl->set( 'displaytitle', $out->mPageLinkTitle );
 143          */
 144         public $mPageLinkTitle = '';
 145
 146         /** @var array Array of elements in "<head>". Parser might add its own headers! */
 147         protected $mHeadItems = [];
 148
 149         /** @var array Additional <body> classes; there are also <body> classes from other sources */
 150         protected $mAdditionalBodyClasses = [];
 151
 152         /** @var array */
 153         protected $mModules = [];
 154
 155         /** @var array */
 156         protected $mModuleStyles = [];
 157
 158         /** @var ResourceLoader */
 159         protected $mResourceLoader;
 160
 161         /** @var ResourceLoaderClientHtml */
 162         private $rlClient;
 163
 164         /** @var ResourceLoaderContext */
 165         private $rlClientContext;
 166
 167         /** @var array */
 168         private $rlExemptStyleModules;
 169
 170         /** @var array */
 171         protected $mJsConfigVars = [];
 172
 173         /** @var array */
 174         protected $mTemplateIds = [];
 175
 176         /** @var array */
 177         protected $mImageTimeKeys = [];
 178
 179         /** @var string */
 180         public $mRedirectCode = '';
 181
 182         protected $mFeedLinksAppendQuery = null;
 183
 184         /** @var array
 185          * What level of 'untrustworthiness' is allowed in CSS/JS modules loaded on this page?
 186          * @see ResourceLoaderModule::$origin
 187          * ResourceLoaderModule::ORIGIN_ALL is assumed unless overridden;
 188          */
 189         protected $mAllowedModules = [
 190                 ResourceLoaderModule::TYPE_COMBINED => ResourceLoaderModule::ORIGIN_ALL,
 191         ];
 192
 193         /** @var bool Whether output is disabled.  If this is true, the 'output' method will do nothing. */
 194         protected $mDoNothing = false;
 195
 196         // Parser related.
 197
 198         /** @var int */
 199         protected $mContainsNewMagic = 0;
 200
 201         /**
 202          * lazy initialised, use parserOptions()
 203          * @var ParserOptions
 204          */
 205         protected $mParserOptions = null;
 206
 207         /**
 208          * Handles the Atom / RSS links.
 209          * We probably only support Atom in 2011.
 210          * @see $wgAdvertisedFeedTypes
 211          */
 212         private $mFeedLinks = [];
 213
 214         // Gwicke work on squid caching? Roughly from 2003.
 215         protected $mEnableClientCache = true;
 216
 217         /** @var bool Flag if output should only contain the body of the article. */
 218         private $mArticleBodyOnly = false;
 219
 220         /** @var bool */
 221         protected $mNewSectionLink = false;
 222
 223         /** @var bool */
 224         protected $mHideNewSectionLink = false;
 225
 226         /**
 227          * @var bool Comes from the parser. This was probably made to load CSS/JS
 228          * only if we had "<gallery>". Used directly in CategoryPage.php.
 229          * Looks like ResourceLoader can replace this.
 230          */
 231         public $mNoGallery = false;
 232
 233         /** @var int Cache stuff. Looks like mEnableClientCache */
 234         protected $mCdnMaxage = 0;
 235         /** @var int Upper limit on mCdnMaxage */
 236         protected $mCdnMaxageLimit = INF;
 237
 238         /**
 239          * @var bool Controls if anti-clickjacking / frame-breaking headers will
 240          * be sent. This should be done for pages where edit actions are possible.
 241          * Setters: $this->preventClickjacking() and $this->allowClickjacking().
 242          */
 243         protected $mPreventClickjacking = true;
 244
 245         /** @var int To include the variable {{REVISIONID}} */
 246         private $mRevisionId = null;
 247
 248         /** @var string */
 249         private $mRevisionTimestamp = null;
 250
 251         /** @var array */
 252         protected $mFileVersion = null;
 253
 254         /**
 255          * @var array An array of stylesheet filenames (relative from skins path),
 256          * with options for CSS media, IE conditions, and RTL/LTR direction.
 257          * For internal use; add settings in the skin via $this->addStyle()
 258          *
 259          * Style again! This seems like a code duplication since we already have
 260          * mStyles. This is what makes Open Source amazing.
 261          */
 262         protected $styles = [];
 263
 264         private $mIndexPolicy = 'index';
 265         private $mFollowPolicy = 'follow';
 266
 267         /**
 268          * @var array Headers that cause the cache to vary.  Key is header name,
 269          * value should always be null.  (Value was an array of options for
 270          * the `Key` header, which was deprecated in 1.32 and removed in 1.34.)
 271          */
 272         private $mVaryHeader = [
 273                 'Accept-Encoding' => null,
 274         ];
 275
 276         /**
 277          * If the current page was reached through a redirect, $mRedirectedFrom contains the Title
 278          * of the redirect.
 279          *
 280          * @var Title
 281          */
 282         private $mRedirectedFrom = null;
 283
 284         /**
 285          * Additional key => value data
 286          */
 287         private $mProperties = [];
 288
 289         /**
 290          * @var string|null ResourceLoader target for load.php links. If null, will be omitted
 291          */
 292         private $mTarget = null;
 293
 294         /**
 295          * @var bool Whether parser output contains a table of contents
 296          */
 297         private $mEnableTOC = false;
 298
 299         /**
 300          * @var string|null The URL to send in a <link> element with rel=license
 301          */
 302         private $copyrightUrl;
 303
 304         /** @var array Profiling data */
 305         private $limitReportJSData = [];
 306
 307         /** @var array Map Title to Content */
 308         private $contentOverrides = [];
 309
 310         /** @var callable[] */
 311         private $contentOverrideCallbacks = [];
 312
 313         /**
 314          * Link: header contents
 315          */
 316         private $mLinkHeader = [];
 317
 318         /**
 319          * @var string The nonce for Content-Security-Policy
 320          */
 321         private $CSPNonce;
 322
 323         /**
 324          * @var array A cache of the names of the cookies that will influence the cache
 325          */
 326         private static $cacheVaryCookies = null;
 327
 328         /**
 329          * Constructor for OutputPage. This should not be called directly.
 330          * Instead a new RequestContext should be created and it will implicitly create
 331          * a OutputPage tied to that context.
 332          * @param IContextSource $context
 333          */
 334         function __construct( IContextSource $context ) {
 335                 $this->setContext( $context );
 336         }
 337
 338         /**
 339          * Redirect to $url rather than displaying the normal page
 340          *
 341          * @param string $url
 342          * @param string $responsecode HTTP status code
 343          */
 344         public function redirect( $url, $responsecode = '302' ) {
 345                 # Strip newlines as a paranoia check for header injection in PHP<5.1.2
 346                 $this->mRedirect = str_replace( "\n", '', $url );
 347                 $this->mRedirectCode = $responsecode;
 348         }
 349
 350         /**
 351          * Get the URL to redirect to, or an empty string if not redirect URL set
 352          *
 353          * @return string
 354          */
 355         public function getRedirect() {
 356                 return $this->mRedirect;
 357         }
 358
 359         /**
 360          * Set the copyright URL to send with the output.
 361          * Empty string to omit, null to reset.
 362          *
 363          * @since 1.26
 364          *
 365          * @param string|null $url
 366          */
 367         public function setCopyrightUrl( $url ) {
 368                 $this->copyrightUrl = $url;
 369         }
 370
 371         /**
 372          * Set the HTTP status code to send with the output.
 373          *
 374          * @param int $statusCode
 375          */
 376         public function setStatusCode( $statusCode ) {
 377                 $this->mStatusCode = $statusCode;
 378         }
 379
 380         /**
 381          * Add a new "<meta>" tag
 382          * To add an http-equiv meta tag, precede the name with "http:"
 383          *
 384          * @param string $name Name of the meta tag
 385          * @param string $val Value of the meta tag
 386          */
 387         function addMeta( $name, $val ) {
 388                 array_push( $this->mMetatags, [ $name, $val ] );
 389         }
 390
 391         /**
 392          * Returns the current <meta> tags
 393          *
 394          * @since 1.25
 395          * @return array
 396          */
 397         public function getMetaTags() {
 398                 return $this->mMetatags;
 399         }
 400
 401         /**
 402          * Add a new \<link\> tag to the page header.
 403          *
 404          * Note: use setCanonicalUrl() for rel=canonical.
 405          *
 406          * @param array $linkarr Associative array of attributes.
 407          */
 408         function addLink( array $linkarr ) {
 409                 array_push( $this->mLinktags, $linkarr );
 410         }
 411
 412         /**
 413          * Returns the current <link> tags
 414          *
 415          * @since 1.25
 416          * @return array
 417          */
 418         public function getLinkTags() {
 419                 return $this->mLinktags;
 420         }
 421
 422         /**
 423          * Set the URL to be used for the <link rel=canonical>. This should be used
 424          * in preference to addLink(), to avoid duplicate link tags.
 425          * @param string $url
 426          */
 427         function setCanonicalUrl( $url ) {
 428                 $this->mCanonicalUrl = $url;
 429         }
 430
 431         /**
 432          * Returns the URL to be used for the <link rel=canonical> if
 433          * one is set.
 434          *
 435          * @since 1.25
 436          * @return bool|string
 437          */
 438         public function getCanonicalUrl() {
 439                 return $this->mCanonicalUrl;
 440         }
 441
 442         /**
 443          * Add raw HTML to the list of scripts (including \<script\> tag, etc.)
 444          * Internal use only. Use OutputPage::addModules() or OutputPage::addJsConfigVars()
 445          * if possible.
 446          *
 447          * @param string $script Raw HTML
 448          */
 449         function addScript( $script ) {
 450                 $this->mScripts .= $script;
 451         }
 452
 453         /**
 454          * Add a JavaScript file to be loaded as `<script>` on this page.
 455          *
 456          * Internal use only. Use OutputPage::addModules() if possible.
 457          *
 458          * @param string $file URL to file (absolute path, protocol-relative, or full url)
 459          * @param string|null $unused Previously used to change the cache-busting query parameter
 460          */
 461         public function addScriptFile( $file, $unused = null ) {
 462                 $this->addScript( Html::linkedScript( $file, $this->getCSPNonce() ) );
 463         }
 464
 465         /**
 466          * Add a self-contained script tag with the given contents
 467          * Internal use only. Use OutputPage::addModules() if possible.
 468          *
 469          * @param string $script JavaScript text, no script tags
 470          */
 471         public function addInlineScript( $script ) {
 472                 $this->mScripts .= Html::inlineScript( "\n$script\n", $this->getCSPNonce() ) . "\n";
 473         }
 474
 475         /**
 476          * Filter an array of modules to remove insufficiently trustworthy members, and modules
 477          * which are no longer registered (eg a page is cached before an extension is disabled)
 478          * @param array $modules
 479          * @param string|null $position Unused
 480          * @param string $type
 481          * @return array
 482          */
 483         protected function filterModules( array $modules, $position = null,
 484                 $type = ResourceLoaderModule::TYPE_COMBINED
 485         ) {
 486                 $resourceLoader = $this->getResourceLoader();
 487                 $filteredModules = [];
 488                 foreach ( $modules as $val ) {
 489                         $module = $resourceLoader->getModule( $val );
 490                         if ( $module instanceof ResourceLoaderModule
 491                                 && $module->getOrigin() <= $this->getAllowedModules( $type )
 492                         ) {
 493                                 if ( $this->mTarget && !in_array( $this->mTarget, $module->getTargets() ) ) {
 494                                         $this->warnModuleTargetFilter( $module->getName() );
 495                                         continue;
 496                                 }
 497                                 $filteredModules[] = $val;
 498                         }
 499                 }
 500                 return $filteredModules;
 501         }
 502
 503         private function warnModuleTargetFilter( $moduleName ) {
 504                 static $warnings = [];
 505                 if ( isset( $warnings[$this->mTarget][$moduleName] ) ) {
 506                         return;
 507                 }
 508                 $warnings[$this->mTarget][$moduleName] = true;
 509                 $this->getResourceLoader()->getLogger()->debug(
 510                         'Module "{module}" not loadable on target "{target}".',
 511                         [
 512                                 'module' => $moduleName,
 513                                 'target' => $this->mTarget,
 514                         ]
 515                 );
 516         }
 517
 518         /**
 519          * Get the list of modules to include on this page
 520          *
 521          * @param bool $filter Whether to filter out insufficiently trustworthy modules
 522          * @param string|null $position Unused
 523          * @param string $param
 524          * @param string $type
 525          * @return array Array of module names
 526          */
 527         public function getModules( $filter = false, $position = null, $param = 'mModules',
 528                 $type = ResourceLoaderModule::TYPE_COMBINED
 529         ) {
 530                 $modules = array_values( array_unique( $this->$param ) );
 531                 return $filter
 532                         ? $this->filterModules( $modules, null, $type )
 533                         : $modules;
 534         }
 535
 536         /**
 537          * Load one or more ResourceLoader modules on this page.
 538          *
 539          * @param string|array $modules Module name (string) or array of module names
 540          */
 541         public function addModules( $modules ) {
 542                 $this->mModules = array_merge( $this->mModules, (array)$modules );
 543         }
 544
 545         /**
 546          * Get the list of style-only modules to load on this page.
 547          *
 548          * @param bool $filter
 549          * @param string|null $position Unused
 550          * @return array Array of module names
 551          */
 552         public function getModuleStyles( $filter = false, $position = null ) {
 553                 return $this->getModules( $filter, null, 'mModuleStyles',
 554                         ResourceLoaderModule::TYPE_STYLES
 555                 );
 556         }
 557
 558         /**
 559          * Load the styles of one or more ResourceLoader modules on this page.
 560          *
 561          * Module styles added through this function will be loaded as a stylesheet,
 562          * using a standard `<link rel=stylesheet>` HTML tag, rather than as a combined
 563          * Javascript and CSS package. Thus, they will even load when JavaScript is disabled.
 564          *
 565          * @param string|array $modules Module name (string) or array of module names
 566          */
 567         public function addModuleStyles( $modules ) {
 568                 $this->mModuleStyles = array_merge( $this->mModuleStyles, (array)$modules );
 569         }
 570
 571         /**
 572          * @return null|string ResourceLoader target
 573          */
 574         public function getTarget() {
 575                 return $this->mTarget;
 576         }
 577
 578         /**
 579          * Sets ResourceLoader target for load.php links. If null, will be omitted
 580          *
 581          * @param string|null $target
 582          */
 583         public function setTarget( $target ) {
 584                 $this->mTarget = $target;
 585         }
 586
 587         /**
 588          * Add a mapping from a LinkTarget to a Content, for things like page preview.
 589          * @see self::addContentOverrideCallback()
 590          * @since 1.32
 591          * @param LinkTarget $target
 592          * @param Content $content
 593          */
 594         public function addContentOverride( LinkTarget $target, Content $content ) {
 595                 if ( !$this->contentOverrides ) {
 596                         // Register a callback for $this->contentOverrides on the first call
 597                         $this->addContentOverrideCallback( function ( LinkTarget $target ) {
 598                                 $key = $target->getNamespace() . ':' . $target->getDBkey();
 599                                 return $this->contentOverrides[$key] ?? null;
 600                         } );
 601                 }
 602
 603                 $key = $target->getNamespace() . ':' . $target->getDBkey();
 604                 $this->contentOverrides[$key] = $content;
 605         }
 606
 607         /**
 608          * Add a callback for mapping from a Title to a Content object, for things
 609          * like page preview.
 610          * @see ResourceLoaderContext::getContentOverrideCallback()
 611          * @since 1.32
 612          * @param callable $callback
 613          */
 614         public function addContentOverrideCallback( callable $callback ) {
 615                 $this->contentOverrideCallbacks[] = $callback;
 616         }
 617
 618         /**
 619          * Get an array of head items
 620          *
 621          * @return array
 622          */
 623         function getHeadItemsArray() {
 624                 return $this->mHeadItems;
 625         }
 626
 627         /**
 628          * Add or replace a head item to the output
 629          *
 630          * Whenever possible, use more specific options like ResourceLoader modules,
 631          * OutputPage::addLink(), OutputPage::addMetaLink() and OutputPage::addFeedLink()
 632          * Fallback options for those are: OutputPage::addStyle, OutputPage::addScript(),
 633          * OutputPage::addInlineScript() and OutputPage::addInlineStyle()
 634          * This would be your very LAST fallback.
 635          *
 636          * @param string $name Item name
 637          * @param string $value Raw HTML
 638          */
 639         public function addHeadItem( $name, $value ) {
 640                 $this->mHeadItems[$name] = $value;
 641         }
 642
 643         /**
 644          * Add one or more head items to the output
 645          *
 646          * @since 1.28
 647          * @param string|string[] $values Raw HTML
 648          */
 649         public function addHeadItems( $values ) {
 650                 $this->mHeadItems = array_merge( $this->mHeadItems, (array)$values );
 651         }
 652
 653         /**
 654          * Check if the header item $name is already set
 655          *
 656          * @param string $name Item name
 657          * @return bool
 658          */
 659         public function hasHeadItem( $name ) {
 660                 return isset( $this->mHeadItems[$name] );
 661         }
 662
 663         /**
 664          * Add a class to the <body> element
 665          *
 666          * @since 1.30
 667          * @param string|string[] $classes One or more classes to add
 668          */
 669         public function addBodyClasses( $classes ) {
 670                 $this->mAdditionalBodyClasses = array_merge( $this->mAdditionalBodyClasses, (array)$classes );
 671         }
 672
 673         /**
 674          * Set whether the output should only contain the body of the article,
 675          * without any skin, sidebar, etc.
 676          * Used e.g. when calling with "action=render".
 677          *
 678          * @param bool $only Whether to output only the body of the article
 679          */
 680         public function setArticleBodyOnly( $only ) {
 681                 $this->mArticleBodyOnly = $only;
 682         }
 683
 684         /**
 685          * Return whether the output will contain only the body of the article
 686          *
 687          * @return bool
 688          */
 689         public function getArticleBodyOnly() {
 690                 return $this->mArticleBodyOnly;
 691         }
 692
 693         /**
 694          * Set an additional output property
 695          * @since 1.21
 696          *
 697          * @param string $name
 698          * @param mixed $value
 699          */
 700         public function setProperty( $name, $value ) {
 701                 $this->mProperties[$name] = $value;
 702         }
 703
 704         /**
 705          * Get an additional output property
 706          * @since 1.21
 707          *
 708          * @param string $name
 709          * @return mixed Property value or null if not found
 710          */
 711         public function getProperty( $name ) {
 712                 return $this->mProperties[$name] ?? null;
 713         }
 714
 715         /**
 716          * checkLastModified tells the client to use the client-cached page if
 717          * possible. If successful, the OutputPage is disabled so that
 718          * any future call to OutputPage->output() have no effect.
 719          *
 720          * Side effect: sets mLastModified for Last-Modified header
 721          *
 722          * @param string $timestamp
 723          *
 724          * @return bool True if cache-ok headers was sent.
 725          */
 726         public function checkLastModified( $timestamp ) {
 727                 if ( !$timestamp || $timestamp == '19700101000000' ) {
 728                         wfDebug( __METHOD__ . ": CACHE DISABLED, NO TIMESTAMP\n" );
 729                         return false;
 730                 }
 731                 $config = $this->getConfig();
 732                 if ( !$config->get( 'CachePages' ) ) {
 733                         wfDebug( __METHOD__ . ": CACHE DISABLED\n" );
 734                         return false;
 735                 }
 736
 737                 $timestamp = wfTimestamp( TS_MW, $timestamp );
 738                 $modifiedTimes = [
 739                         'page' => $timestamp,
 740                         'user' => $this->getUser()->getTouched(),
 741                         'epoch' => $config->get( 'CacheEpoch' )
 742                 ];
 743                 if ( $config->get( 'UseCdn' ) ) {
 744                         $modifiedTimes['sepoch'] = wfTimestamp( TS_MW, $this->getCdnCacheEpoch(
 745                                 time(),
 746                                 $config->get( 'CdnMaxAge' )
 747                         ) );
 748                 }
 749                 Hooks::run( 'OutputPageCheckLastModified', [ &$modifiedTimes, $this ] );
 750
 751                 $maxModified = max( $modifiedTimes );
 752                 $this->mLastModified = wfTimestamp( TS_RFC2822, $maxModified );
 753
 754                 $clientHeader = $this->getRequest()->getHeader( 'If-Modified-Since' );
 755                 if ( $clientHeader === false ) {
 756                         wfDebug( __METHOD__ . ": client did not send If-Modified-Since header", 'private' );
 757                         return false;
 758                 }
 759
 760                 # IE sends sizes after the date like this:
 761                 # Wed, 20 Aug 2003 06:51:19 GMT; length=5202
 762                 # this breaks strtotime().
 763                 $clientHeader = preg_replace( '/;.*$/', '', $clientHeader );
 764
 765                 Wikimedia\suppressWarnings(); // E_STRICT system time warnings
 766                 $clientHeaderTime = strtotime( $clientHeader );
 767                 Wikimedia\restoreWarnings();
 768                 if ( !$clientHeaderTime ) {
 769                         wfDebug( __METHOD__
 770                                 . ": unable to parse the client's If-Modified-Since header: $clientHeader\n" );
 771                         return false;
 772                 }
 773                 $clientHeaderTime = wfTimestamp( TS_MW, $clientHeaderTime );
 774
 775                 # Make debug info
 776                 $info = '';
 777                 foreach ( $modifiedTimes as $name => $value ) {
 778                         if ( $info !== '' ) {
 779                                 $info .= ', ';
 780                         }
 781                         $info .= "$name=" . wfTimestamp( TS_ISO_8601, $value );
 782                 }
 783
 784                 wfDebug( __METHOD__ . ": client sent If-Modified-Since: " .
 785                         wfTimestamp( TS_ISO_8601, $clientHeaderTime ), 'private' );
 786                 wfDebug( __METHOD__ . ": effective Last-Modified: " .
 787                         wfTimestamp( TS_ISO_8601, $maxModified ), 'private' );
 788                 if ( $clientHeaderTime < $maxModified ) {
 789                         wfDebug( __METHOD__ . ": STALE, $info", 'private' );
 790                         return false;
 791                 }
 792
 793                 # Not modified
 794                 # Give a 304 Not Modified response code and disable body output
 795                 wfDebug( __METHOD__ . ": NOT MODIFIED, $info", 'private' );
 796                 ini_set( 'zlib.output_compression', 0 );
 797                 $this->getRequest()->response()->statusHeader( 304 );
 798                 $this->sendCacheControl();
 799                 $this->disable();
 800
 801                 // Don't output a compressed blob when using ob_gzhandler;
 802                 // it's technically against HTTP spec and seems to confuse
 803                 // Firefox when the response gets split over two packets.
 804                 wfClearOutputBuffers();
 805
 806                 return true;
 807         }
 808
 809         /**
 810          * @param int $reqTime Time of request (eg. now)
 811          * @param int $maxAge Cache TTL in seconds
 812          * @return int Timestamp
 813          */
 814         private function getCdnCacheEpoch( $reqTime, $maxAge ) {
 815                 // Ensure Last-Modified is never more than $wgCdnMaxAge in the past,
 816                 // because even if the wiki page content hasn't changed since, static
 817                 // resources may have changed (skin HTML, interface messages, urls, etc.)
 818                 // and must roll-over in a timely manner (T46570)
 819                 return $reqTime - $maxAge;
 820         }
 821
 822         /**
 823          * Override the last modified timestamp
 824          *
 825          * @param string $timestamp New timestamp, in a format readable by
 826          *        wfTimestamp()
 827          */
 828         public function setLastModified( $timestamp ) {
 829                 $this->mLastModified = wfTimestamp( TS_RFC2822, $timestamp );
 830         }
 831
 832         /**
 833          * Set the robot policy for the page: <http://www.robotstxt.org/meta.html>
 834          *
 835          * @param string $policy The literal string to output as the contents of
 836          *   the meta tag.  Will be parsed according to the spec and output in
 837          *   standardized form.
 838          * @return null
 839          */
 840         public function setRobotPolicy( $policy ) {
 841                 $policy = Article::formatRobotPolicy( $policy );
 842
 843                 if ( isset( $policy['index'] ) ) {
 844                         $this->setIndexPolicy( $policy['index'] );
 845                 }
 846                 if ( isset( $policy['follow'] ) ) {
 847                         $this->setFollowPolicy( $policy['follow'] );
 848                 }
 849         }
 850
 851         /**
 852          * Set the index policy for the page, but leave the follow policy un-
 853          * touched.
 854          *
 855          * @param string $policy Either 'index' or 'noindex'.
 856          * @return null
 857          */
 858         public function setIndexPolicy( $policy ) {
 859                 $policy = trim( $policy );
 860                 if ( in_array( $policy, [ 'index', 'noindex' ] ) ) {
 861                         $this->mIndexPolicy = $policy;
 862                 }
 863         }
 864
 865         /**
 866          * Set the follow policy for the page, but leave the index policy un-
 867          * touched.
 868          *
 869          * @param string $policy Either 'follow' or 'nofollow'.
 870          * @return null
 871          */
 872         public function setFollowPolicy( $policy ) {
 873                 $policy = trim( $policy );
 874                 if ( in_array( $policy, [ 'follow', 'nofollow' ] ) ) {
 875                         $this->mFollowPolicy = $policy;
 876                 }
 877         }
 878
 879         /**
 880          * "HTML title" means the contents of "<title>".
 881          * It is stored as plain, unescaped text and will be run through htmlspecialchars in the skin file.
 882          *
 883          * @param string|Message $name
 884          */
 885         public function setHTMLTitle( $name ) {
 886                 if ( $name instanceof Message ) {
 887                         $this->mHTMLtitle = $name->setContext( $this->getContext() )->text();
 888                 } else {
 889                         $this->mHTMLtitle = $name;
 890                 }
 891         }
 892
 893         /**
 894          * Return the "HTML title", i.e. the content of the "<title>" tag.
 895          *
 896          * @return string
 897          */
 898         public function getHTMLTitle() {
 899                 return $this->mHTMLtitle;
 900         }
 901
 902         /**
 903          * Set $mRedirectedFrom, the Title of the page which redirected us to the current page.
 904          *
 905          * @param Title $t
 906          */
 907         public function setRedirectedFrom( $t ) {
 908                 $this->mRedirectedFrom = $t;
 909         }
 910
 911         /**
 912          * "Page title" means the contents of \<h1\>. It is stored as a valid HTML
 913          * fragment. This function allows good tags like \<sup\> in the \<h1\> tag,
 914          * but not bad tags like \<script\>. This function automatically sets
 915          * \<title\> to the same content as \<h1\> but with all tags removed. Bad
 916          * tags that were escaped in \<h1\> will still be escaped in \<title\>, and
 917          * good tags like \<i\> will be dropped entirely.
 918          *
 919          * @param string|Message $name
 920          * @param-taint $name tainted
 921          * Phan-taint-check gets very confused by $name being either a string or a Message
 922          */
 923         public function setPageTitle( $name ) {
 924                 if ( $name instanceof Message ) {
 925                         $name = $name->setContext( $this->getContext() )->text();
 926                 }
 927
 928                 # change "<script>foo&bar</script>" to "&lt;script&gt;foo&amp;bar&lt;/script&gt;"
 929                 # but leave "<i>foobar</i>" alone
 930                 $nameWithTags = Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags( $name ) );
 931                 $this->mPageTitle = $nameWithTags;
 932
 933                 # change "<i>foo&amp;bar</i>" to "foo&bar"
 934                 $this->setHTMLTitle(
 935                         $this->msg( 'pagetitle' )->plaintextParams( Sanitizer::stripAllTags( $nameWithTags ) )
 936                                 ->inContentLanguage()
 937                 );
 938         }
 939
 940         /**
 941          * Return the "page title", i.e. the content of the \<h1\> tag.
 942          *
 943          * @return string
 944          */
 945         public function getPageTitle() {
 946                 return $this->mPageTitle;
 947         }
 948
 949         /**
 950          * Same as page title but only contains name of the page, not any other text.
 951          *
 952          * @since 1.32
 953          * @param string $html Page title text.
 954          * @see OutputPage::setPageTitle
 955          */
 956         public function setDisplayTitle( $html ) {
 957                 $this->displayTitle = $html;
 958         }
 959
 960         /**
 961          * Returns page display title.
 962          *
 963          * Performs some normalization, but this not as strict the magic word.
 964          *
 965          * @since 1.32
 966          * @return string HTML
 967          */
 968         public function getDisplayTitle() {
 969                 $html = $this->displayTitle;
 970                 if ( $html === null ) {
 971                         $html = $this->getTitle()->getPrefixedText();
 972                 }
 973
 974                 return Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags( $html ) );
 975         }
 976
 977         /**
 978          * Returns page display title without namespace prefix if possible.
 979          *
 980          * @since 1.32
 981          * @return string HTML
 982          */
 983         public function getUnprefixedDisplayTitle() {
 984                 $text = $this->getDisplayTitle();
 985                 $nsPrefix = $this->getTitle()->getNsText() . ':';
 986                 $prefix = preg_quote( $nsPrefix, '/' );
 987
 988                 return preg_replace( "/^$prefix/i", '', $text );
 989         }
 990
 991         /**
 992          * Set the Title object to use
 993          *
 994          * @param Title $t
 995          */
 996         public function setTitle( Title $t ) {
 997                 $this->getContext()->setTitle( $t );
 998         }
 999
1000         /**
1001          * Replace the subtitle with $str
1002          *
1003          * @param string|Message $str New value of the subtitle. String should be safe HTML.
1004          */
1005         public function setSubtitle( $str ) {
1006                 $this->clearSubtitle();
1007                 $this->addSubtitle( $str );
1008         }
1009
1010         /**
1011          * Add $str to the subtitle
1012          *
1013          * @param string|Message $str String or Message to add to the subtitle. String should be safe HTML.
1014          */
1015         public function addSubtitle( $str ) {
1016                 if ( $str instanceof Message ) {
1017                         $this->mSubtitle[] = $str->setContext( $this->getContext() )->parse();
1018                 } else {
1019                         $this->mSubtitle[] = $str;
1020                 }
1021         }
1022
1023         /**
1024          * Build message object for a subtitle containing a backlink to a page
1025          *
1026          * @param Title $title Title to link to
1027          * @param array $query Array of additional parameters to include in the link
1028          * @return Message
1029          * @since 1.25
1030          */
1031         public static function buildBacklinkSubtitle( Title $title, $query = [] ) {
1032                 if ( $title->isRedirect() ) {
1033                         $query['redirect'] = 'no';
1034                 }
1035                 $linkRenderer = MediaWikiServices::getInstance()->getLinkRenderer();
1036                 return wfMessage( 'backlinksubtitle' )
1037                         ->rawParams( $linkRenderer->makeLink( $title, null, [], $query ) );
1038         }
1039
1040         /**
1041          * Add a subtitle containing a backlink to a page
1042          *
1043          * @param Title $title Title to link to
1044          * @param array $query Array of additional parameters to include in the link
1045          */
1046         public function addBacklinkSubtitle( Title $title, $query = [] ) {
1047                 $this->addSubtitle( self::buildBacklinkSubtitle( $title, $query ) );
1048         }
1049
1050         /**
1051          * Clear the subtitles
1052          */
1053         public function clearSubtitle() {
1054                 $this->mSubtitle = [];
1055         }
1056
1057         /**
1058          * Get the subtitle
1059          *
1060          * @return string
1061          */
1062         public function getSubtitle() {
1063                 return implode( "<br />\n\t\t\t\t", $this->mSubtitle );
1064         }
1065
1066         /**
1067          * Set the page as printable, i.e. it'll be displayed with all
1068          * print styles included
1069          */
1070         public function setPrintable() {
1071                 $this->mPrintable = true;
1072         }
1073
1074         /**
1075          * Return whether the page is "printable"
1076          *
1077          * @return bool
1078          */
1079         public function isPrintable() {
1080                 return $this->mPrintable;
1081         }
1082
1083         /**
1084          * Disable output completely, i.e. calling output() will have no effect
1085          */
1086         public function disable() {
1087                 $this->mDoNothing = true;
1088         }
1089
1090         /**
1091          * Return whether the output will be completely disabled
1092          *
1093          * @return bool
1094          */
1095         public function isDisabled() {
1096                 return $this->mDoNothing;
1097         }
1098
1099         /**
1100          * Show an "add new section" link?
1101          *
1102          * @return bool
1103          */
1104         public function showNewSectionLink() {
1105                 return $this->mNewSectionLink;
1106         }
1107
1108         /**
1109          * Forcibly hide the new section link?
1110          *
1111          * @return bool
1112          */
1113         public function forceHideNewSectionLink() {
1114                 return $this->mHideNewSectionLink;
1115         }
1116
1117         /**
1118          * Add or remove feed links in the page header
1119          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
1120          * for the new version
1121          * @see addFeedLink()
1122          *
1123          * @param bool $show True: add default feeds, false: remove all feeds
1124          */
1125         public function setSyndicated( $show = true ) {
1126                 if ( $show ) {
1127                         $this->setFeedAppendQuery( false );
1128                 } else {
1129                         $this->mFeedLinks = [];
1130                 }
1131         }
1132
1133         /**
1134          * Return effective list of advertised feed types
1135          * @see addFeedLink()
1136          *
1137          * @return array Array of feed type names ( 'rss', 'atom' )
1138          */
1139         protected function getAdvertisedFeedTypes() {
1140                 if ( $this->getConfig()->get( 'Feed' ) ) {
1141                         return $this->getConfig()->get( 'AdvertisedFeedTypes' );
1142                 } else {
1143                         return [];
1144                 }
1145         }
1146
1147         /**
1148          * Add default feeds to 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 string $val Query to append to feed links or false to output
1154          *        default links
1155          */
1156         public function setFeedAppendQuery( $val ) {
1157                 $this->mFeedLinks = [];
1158
1159                 foreach ( $this->getAdvertisedFeedTypes() as $type ) {
1160                         $query = "feed=$type";
1161                         if ( is_string( $val ) ) {
1162                                 $query .= '&' . $val;
1163                         }
1164                         $this->mFeedLinks[$type] = $this->getTitle()->getLocalURL( $query );
1165                 }
1166         }
1167
1168         /**
1169          * Add a feed link to the page header
1170          *
1171          * @param string $format Feed type, should be a key of $wgFeedClasses
1172          * @param string $href URL
1173          */
1174         public function addFeedLink( $format, $href ) {
1175                 if ( in_array( $format, $this->getAdvertisedFeedTypes() ) ) {
1176                         $this->mFeedLinks[$format] = $href;
1177                 }
1178         }
1179
1180         /**
1181          * Should we output feed links for this page?
1182          * @return bool
1183          */
1184         public function isSyndicated() {
1185                 return count( $this->mFeedLinks ) > 0;
1186         }
1187
1188         /**
1189          * Return URLs for each supported syndication format for this page.
1190          * @return array Associating format keys with URLs
1191          */
1192         public function getSyndicationLinks() {
1193                 return $this->mFeedLinks;
1194         }
1195
1196         /**
1197          * Will currently always return null
1198          *
1199          * @return null
1200          */
1201         public function getFeedAppendQuery() {
1202                 return $this->mFeedLinksAppendQuery;
1203         }
1204
1205         /**
1206          * Set whether the displayed content is related to the source of the
1207          * corresponding article on the wiki
1208          * Setting true will cause the change "article related" toggle to true
1209          *
1210          * @param bool $newVal
1211          */
1212         public function setArticleFlag( $newVal ) {
1213                 $this->mIsArticle = $newVal;
1214                 if ( $newVal ) {
1215                         $this->mIsArticleRelated = $newVal;
1216                 }
1217         }
1218
1219         /**
1220          * Return whether the content displayed page is related to the source of
1221          * the corresponding article on the wiki
1222          *
1223          * @return bool
1224          */
1225         public function isArticle() {
1226                 return $this->mIsArticle;
1227         }
1228
1229         /**
1230          * Set whether this page is related an article on the wiki
1231          * Setting false will cause the change of "article flag" toggle to false
1232          *
1233          * @param bool $newVal
1234          */
1235         public function setArticleRelated( $newVal ) {
1236                 $this->mIsArticleRelated = $newVal;
1237                 if ( !$newVal ) {
1238                         $this->mIsArticle = false;
1239                 }
1240         }
1241
1242         /**
1243          * Return whether this page is related an article on the wiki
1244          *
1245          * @return bool
1246          */
1247         public function isArticleRelated() {
1248                 return $this->mIsArticleRelated;
1249         }
1250
1251         /**
1252          * Set whether the standard copyright should be shown for the current page.
1253          *
1254          * @param bool $hasCopyright
1255          */
1256         public function setCopyright( $hasCopyright ) {
1257                 $this->mHasCopyright = $hasCopyright;
1258         }
1259
1260         /**
1261          * Return whether the standard copyright should be shown for the current page.
1262          * By default, it is true for all articles but other pages
1263          * can signal it by using setCopyright( true ).
1264          *
1265          * Used by SkinTemplate to decided whether to show the copyright.
1266          *
1267          * @return bool
1268          */
1269         public function showsCopyright() {
1270                 return $this->isArticle() || $this->mHasCopyright;
1271         }
1272
1273         /**
1274          * Add new language links
1275          *
1276          * @param string[] $newLinkArray Array of interwiki-prefixed (non DB key) titles
1277          *                               (e.g. 'fr:Test page')
1278          */
1279         public function addLanguageLinks( array $newLinkArray ) {
1280                 $this->mLanguageLinks = array_merge( $this->mLanguageLinks, $newLinkArray );
1281         }
1282
1283         /**
1284          * Reset the language links and add new language links
1285          *
1286          * @param string[] $newLinkArray Array of interwiki-prefixed (non DB key) titles
1287          *                               (e.g. 'fr:Test page')
1288          */
1289         public function setLanguageLinks( array $newLinkArray ) {
1290                 $this->mLanguageLinks = $newLinkArray;
1291         }
1292
1293         /**
1294          * Get the list of language links
1295          *
1296          * @return string[] Array of interwiki-prefixed (non DB key) titles (e.g. 'fr:Test page')
1297          */
1298         public function getLanguageLinks() {
1299                 return $this->mLanguageLinks;
1300         }
1301
1302         /**
1303          * Add an array of categories, with names in the keys
1304          *
1305          * @param array $categories Mapping category name => sort key
1306          */
1307         public function addCategoryLinks( array $categories ) {
1308                 if ( !$categories ) {
1309                         return;
1310                 }
1311
1312                 $res = $this->addCategoryLinksToLBAndGetResult( $categories );
1313
1314                 # Set all the values to 'normal'.
1315                 $categories = array_fill_keys( array_keys( $categories ), 'normal' );
1316
1317                 # Mark hidden categories
1318                 foreach ( $res as $row ) {
1319                         if ( isset( $row->pp_value ) ) {
1320                                 $categories[$row->page_title] = 'hidden';
1321                         }
1322                 }
1323
1324                 // Avoid PHP 7.1 warning of passing $this by reference
1325                 $outputPage = $this;
1326                 # Add the remaining categories to the skin
1327                 if ( Hooks::run(
1328                         'OutputPageMakeCategoryLinks',
1329                         [ &$outputPage, $categories, &$this->mCategoryLinks ] )
1330                 ) {
1331                         $services = MediaWikiServices::getInstance();
1332                         $linkRenderer = $services->getLinkRenderer();
1333                         foreach ( $categories as $category => $type ) {
1334                                 // array keys will cast numeric category names to ints, so cast back to string
1335                                 $category = (string)$category;
1336                                 $origcategory = $category;
1337                                 $title = Title::makeTitleSafe( NS_CATEGORY, $category );
1338                                 if ( !$title ) {
1339                                         continue;
1340                                 }
1341                                 $services->getContentLanguage()->findVariantLink( $category, $title, true );
1342                                 if ( $category != $origcategory && array_key_exists( $category, $categories ) ) {
1343                                         continue;
1344                                 }
1345                                 $text = $services->getContentLanguage()->convertHtml( $title->getText() );
1346                                 $this->mCategories[$type][] = $title->getText();
1347                                 $this->mCategoryLinks[$type][] = $linkRenderer->makeLink( $title, new HtmlArmor( $text ) );
1348                         }
1349                 }
1350         }
1351
1352         /**
1353          * @param array $categories
1354          * @return bool|IResultWrapper
1355          */
1356         protected function addCategoryLinksToLBAndGetResult( array $categories ) {
1357                 # Add the links to a LinkBatch
1358                 $arr = [ NS_CATEGORY => $categories ];
1359                 $lb = new LinkBatch;
1360                 $lb->setArray( $arr );
1361
1362                 # Fetch existence plus the hiddencat property
1363                 $dbr = wfGetDB( DB_REPLICA );
1364                 $fields = array_merge(
1365                         LinkCache::getSelectFields(),
1366                         [ 'page_namespace', 'page_title', 'pp_value' ]
1367                 );
1368
1369                 $res = $dbr->select( [ 'page', 'page_props' ],
1370                         $fields,
1371                         $lb->constructSet( 'page', $dbr ),
1372                         __METHOD__,
1373                         [],
1374                         [ 'page_props' => [ 'LEFT JOIN', [
1375                                 'pp_propname' => 'hiddencat',
1376                                 'pp_page = page_id'
1377                         ] ] ]
1378                 );
1379
1380                 # Add the results to the link cache
1381                 $linkCache = MediaWikiServices::getInstance()->getLinkCache();
1382                 $lb->addResultToCache( $linkCache, $res );
1383
1384                 return $res;
1385         }
1386
1387         /**
1388          * Reset the category links (but not the category list) and add $categories
1389          *
1390          * @param array $categories Mapping category name => sort key
1391          */
1392         public function setCategoryLinks( array $categories ) {
1393                 $this->mCategoryLinks = [];
1394                 $this->addCategoryLinks( $categories );
1395         }
1396
1397         /**
1398          * Get the list of category links, in a 2-D array with the following format:
1399          * $arr[$type][] = $link, where $type is either "normal" or "hidden" (for
1400          * hidden categories) and $link a HTML fragment with a link to the category
1401          * page
1402          *
1403          * @return array
1404          */
1405         public function getCategoryLinks() {
1406                 return $this->mCategoryLinks;
1407         }
1408
1409         /**
1410          * Get the list of category names this page belongs to.
1411          *
1412          * @param string $type The type of categories which should be returned. Possible values:
1413          *  * all: all categories of all types
1414          *  * hidden: only the hidden categories
1415          *  * normal: all categories, except hidden categories
1416          * @return array Array of strings
1417          */
1418         public function getCategories( $type = 'all' ) {
1419                 if ( $type === 'all' ) {
1420                         $allCategories = [];
1421                         foreach ( $this->mCategories as $categories ) {
1422                                 $allCategories = array_merge( $allCategories, $categories );
1423                         }
1424                         return $allCategories;
1425                 }
1426                 if ( !isset( $this->mCategories[$type] ) ) {
1427                         throw new InvalidArgumentException( 'Invalid category type given: ' . $type );
1428                 }
1429                 return $this->mCategories[$type];
1430         }
1431
1432         /**
1433          * Add an array of indicators, with their identifiers as array
1434          * keys and HTML contents as values.
1435          *
1436          * In case of duplicate keys, existing values are overwritten.
1437          *
1438          * @param array $indicators
1439          * @since 1.25
1440          */
1441         public function setIndicators( array $indicators ) {
1442                 $this->mIndicators = $indicators + $this->mIndicators;
1443                 // Keep ordered by key
1444                 ksort( $this->mIndicators );
1445         }
1446
1447         /**
1448          * Get the indicators associated with this page.
1449          *
1450          * The array will be internally ordered by item keys.
1451          *
1452          * @return array Keys: identifiers, values: HTML contents
1453          * @since 1.25
1454          */
1455         public function getIndicators() {
1456                 return $this->mIndicators;
1457         }
1458
1459         /**
1460          * Adds help link with an icon via page indicators.
1461          * Link target can be overridden by a local message containing a wikilink:
1462          * the message key is: lowercase action or special page name + '-helppage'.
1463          * @param string $to Target MediaWiki.org page title or encoded URL.
1464          * @param bool $overrideBaseUrl Whether $url is a full URL, to avoid MW.o.
1465          * @since 1.25
1466          */
1467         public function addHelpLink( $to, $overrideBaseUrl = false ) {
1468                 $this->addModuleStyles( 'mediawiki.helplink' );
1469                 $text = $this->msg( 'helppage-top-gethelp' )->escaped();
1470
1471                 if ( $overrideBaseUrl ) {
1472                         $helpUrl = $to;
1473                 } else {
1474                         $toUrlencoded = wfUrlencode( str_replace( ' ', '_', $to ) );
1475                         $helpUrl = "https://www.mediawiki.org/wiki/Special:MyLanguage/$toUrlencoded";
1476                 }
1477
1478                 $link = Html::rawElement(
1479                         'a',
1480                         [
1481                                 'href' => $helpUrl,
1482                                 'target' => '_blank',
1483                                 'class' => 'mw-helplink',
1484                         ],
1485                         $text
1486                 );
1487
1488                 $this->setIndicators( [ 'mw-helplink' => $link ] );
1489         }
1490
1491         /**
1492          * Do not allow scripts which can be modified by wiki users to load on this page;
1493          * only allow scripts bundled with, or generated by, the software.
1494          * Site-wide styles are controlled by a config setting, since they can be
1495          * used to create a custom skin/theme, but not user-specific ones.
1496          *
1497          * @todo this should be given a more accurate name
1498          */
1499         public function disallowUserJs() {
1500                 $this->reduceAllowedModules(
1501                         ResourceLoaderModule::TYPE_SCRIPTS,
1502                         ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL
1503                 );
1504
1505                 // Site-wide styles are controlled by a config setting, see T73621
1506                 // for background on why. User styles are never allowed.
1507                 if ( $this->getConfig()->get( 'AllowSiteCSSOnRestrictedPages' ) ) {
1508                         $styleOrigin = ResourceLoaderModule::ORIGIN_USER_SITEWIDE;
1509                 } else {
1510                         $styleOrigin = ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL;
1511                 }
1512                 $this->reduceAllowedModules(
1513                         ResourceLoaderModule::TYPE_STYLES,
1514                         $styleOrigin
1515                 );
1516         }
1517
1518         /**
1519          * Show what level of JavaScript / CSS untrustworthiness is allowed on this page
1520          * @see ResourceLoaderModule::$origin
1521          * @param string $type ResourceLoaderModule TYPE_ constant
1522          * @return int ResourceLoaderModule ORIGIN_ class constant
1523          */
1524         public function getAllowedModules( $type ) {
1525                 if ( $type == ResourceLoaderModule::TYPE_COMBINED ) {
1526                         return min( array_values( $this->mAllowedModules ) );
1527                 } else {
1528                         return $this->mAllowedModules[$type] ?? ResourceLoaderModule::ORIGIN_ALL;
1529                 }
1530         }
1531
1532         /**
1533          * Limit the highest level of CSS/JS untrustworthiness allowed.
1534          *
1535          * If passed the same or a higher level than the current level of untrustworthiness set, the
1536          * level will remain unchanged.
1537          *
1538          * @param string $type
1539          * @param int $level ResourceLoaderModule class constant
1540          */
1541         public function reduceAllowedModules( $type, $level ) {
1542                 $this->mAllowedModules[$type] = min( $this->getAllowedModules( $type ), $level );
1543         }
1544
1545         /**
1546          * Prepend $text to the body HTML
1547          *
1548          * @param string $text HTML
1549          */
1550         public function prependHTML( $text ) {
1551                 $this->mBodytext = $text . $this->mBodytext;
1552         }
1553
1554         /**
1555          * Append $text to the body HTML
1556          *
1557          * @param string $text HTML
1558          */
1559         public function addHTML( $text ) {
1560                 $this->mBodytext .= $text;
1561         }
1562
1563         /**
1564          * Shortcut for adding an Html::element via addHTML.
1565          *
1566          * @since 1.19
1567          *
1568          * @param string $element
1569          * @param array $attribs
1570          * @param string $contents
1571          */
1572         public function addElement( $element, array $attribs = [], $contents = '' ) {
1573                 $this->addHTML( Html::element( $element, $attribs, $contents ) );
1574         }
1575
1576         /**
1577          * Clear the body HTML
1578          */
1579         public function clearHTML() {
1580                 $this->mBodytext = '';
1581         }
1582
1583         /**
1584          * Get the body HTML
1585          *
1586          * @return string HTML
1587          */
1588         public function getHTML() {
1589                 return $this->mBodytext;
1590         }
1591
1592         /**
1593          * Get/set the ParserOptions object to use for wikitext parsing
1594          *
1595          * @param ParserOptions|null $options Either the ParserOption to use or null to only get the
1596          *   current ParserOption object. This parameter is deprecated since 1.31.
1597          * @return ParserOptions
1598          */
1599         public function parserOptions( $options = null ) {
1600                 if ( $options !== null ) {
1601                         wfDeprecated( __METHOD__ . ' with non-null $options', '1.31' );
1602                 }
1603
1604                 if ( $options !== null && !empty( $options->isBogus ) ) {
1605                         // Someone is trying to set a bogus pre-$wgUser PO. Check if it has
1606                         // been changed somehow, and keep it if so.
1607                         $anonPO = ParserOptions::newFromAnon();
1608                         $anonPO->setAllowUnsafeRawHtml( false );
1609                         if ( !$options->matches( $anonPO ) ) {
1610                                 wfLogWarning( __METHOD__ . ': Setting a changed bogus ParserOptions: ' . wfGetAllCallers( 5 ) );
1611                                 $options->isBogus = false;
1612                         }
1613                 }
1614
1615                 if ( !$this->mParserOptions ) {
1616                         if ( !$this->getUser()->isSafeToLoad() ) {
1617                                 // $wgUser isn't unstubbable yet, so don't try to get a
1618                                 // ParserOptions for it. And don't cache this ParserOptions
1619                                 // either.
1620                                 $po = ParserOptions::newFromAnon();
1621                                 $po->setAllowUnsafeRawHtml( false );
1622                                 $po->isBogus = true;
1623                                 if ( $options !== null ) {
1624                                         $this->mParserOptions = empty( $options->isBogus ) ? $options : null;
1625                                 }
1626                                 return $po;
1627                         }
1628
1629                         $this->mParserOptions = ParserOptions::newFromContext( $this->getContext() );
1630                         $this->mParserOptions->setAllowUnsafeRawHtml( false );
1631                 }
1632
1633                 if ( $options !== null && !empty( $options->isBogus ) ) {
1634                         // They're trying to restore the bogus pre-$wgUser PO. Do the right
1635                         // thing.
1636                         return wfSetVar( $this->mParserOptions, null, true );
1637                 } else {
1638                         return wfSetVar( $this->mParserOptions, $options );
1639                 }
1640         }
1641
1642         /**
1643          * Set the revision ID which will be seen by the wiki text parser
1644          * for things such as embedded {{REVISIONID}} variable use.
1645          *
1646          * @param int|null $revid A positive integer, or null
1647          * @return mixed Previous value
1648          */
1649         public function setRevisionId( $revid ) {
1650                 $val = is_null( $revid ) ? null : intval( $revid );
1651                 return wfSetVar( $this->mRevisionId, $val, true );
1652         }
1653
1654         /**
1655          * Get the displayed revision ID
1656          *
1657          * @return int
1658          */
1659         public function getRevisionId() {
1660                 return $this->mRevisionId;
1661         }
1662
1663         /**
1664          * Set the timestamp of the revision which will be displayed. This is used
1665          * to avoid a extra DB call in Skin::lastModified().
1666          *
1667          * @param string|null $timestamp
1668          * @return mixed Previous value
1669          */
1670         public function setRevisionTimestamp( $timestamp ) {
1671                 return wfSetVar( $this->mRevisionTimestamp, $timestamp, true );
1672         }
1673
1674         /**
1675          * Get the timestamp of displayed revision.
1676          * This will be null if not filled by setRevisionTimestamp().
1677          *
1678          * @return string|null
1679          */
1680         public function getRevisionTimestamp() {
1681                 return $this->mRevisionTimestamp;
1682         }
1683
1684         /**
1685          * Set the displayed file version
1686          *
1687          * @param File|null $file
1688          * @return mixed Previous value
1689          */
1690         public function setFileVersion( $file ) {
1691                 $val = null;
1692                 if ( $file instanceof File && $file->exists() ) {
1693                         $val = [ 'time' => $file->getTimestamp(), 'sha1' => $file->getSha1() ];
1694                 }
1695                 return wfSetVar( $this->mFileVersion, $val, true );
1696         }
1697
1698         /**
1699          * Get the displayed file version
1700          *
1701          * @return array|null ('time' => MW timestamp, 'sha1' => sha1)
1702          */
1703         public function getFileVersion() {
1704                 return $this->mFileVersion;
1705         }
1706
1707         /**
1708          * Get the templates used on this page
1709          *
1710          * @return array (namespace => dbKey => revId)
1711          * @since 1.18
1712          */
1713         public function getTemplateIds() {
1714                 return $this->mTemplateIds;
1715         }
1716
1717         /**
1718          * Get the files used on this page
1719          *
1720          * @return array [ dbKey => [ 'time' => MW timestamp or null, 'sha1' => sha1 or '' ] ]
1721          * @since 1.18
1722          */
1723         public function getFileSearchOptions() {
1724                 return $this->mImageTimeKeys;
1725         }
1726
1727         /**
1728          * Convert wikitext *in the user interface language* to HTML and
1729          * add it to the buffer. The result will not be
1730          * language-converted, as user interface messages are already
1731          * localized into a specific variant.  Assumes that the current
1732          * page title will be used if optional $title is not
1733          * provided. Output will be tidy.
1734          *
1735          * @param string $text Wikitext in the user interface language
1736          * @param bool $linestart Is this the start of a line? (Defaults to true)
1737          * @param Title|null $title Optional title to use; default of `null`
1738          *   means use current page title.
1739          * @throws MWException if $title is not provided and OutputPage::getTitle()
1740          *   is null
1741          * @since 1.32
1742          */
1743         public function addWikiTextAsInterface(
1744                 $text, $linestart = true, Title $title = null
1745         ) {
1746                 if ( $title === null ) {
1747                         $title = $this->getTitle();
1748                 }
1749                 if ( !$title ) {
1750                         throw new MWException( 'Title is null' );
1751                 }
1752                 $this->addWikiTextTitleInternal( $text, $title, $linestart, /*interface*/true );
1753         }
1754
1755         /**
1756          * Convert wikitext *in the user interface language* to HTML and
1757          * add it to the buffer with a `<div class="$wrapperClass">`
1758          * wrapper.  The result will not be language-converted, as user
1759          * interface messages as already localized into a specific
1760          * variant.  The $text will be parsed in start-of-line context.
1761          * Output will be tidy.
1762          *
1763          * @param string $wrapperClass The class attribute value for the <div>
1764          *   wrapper in the output HTML
1765          * @param string $text Wikitext in the user interface language
1766          * @since 1.32
1767          */
1768         public function wrapWikiTextAsInterface(
1769                 $wrapperClass, $text
1770         ) {
1771                 $this->addWikiTextTitleInternal(
1772                         $text, $this->getTitle(),
1773                         /*linestart*/true, /*interface*/true,
1774                         $wrapperClass
1775                 );
1776         }
1777
1778         /**
1779          * Convert wikitext *in the page content language* to HTML and add
1780          * it to the buffer.  The result with be language-converted to the
1781          * user's preferred variant.  Assumes that the current page title
1782          * will be used if optional $title is not provided. Output will be
1783          * tidy.
1784          *
1785          * @param string $text Wikitext in the page content language
1786          * @param bool $linestart Is this the start of a line? (Defaults to true)
1787          * @param Title|null $title Optional title to use; default of `null`
1788          *   means use current page title.
1789          * @throws MWException if $title is not provided and OutputPage::getTitle()
1790          *   is null
1791          * @since 1.32
1792          */
1793         public function addWikiTextAsContent(
1794                 $text, $linestart = true, Title $title = null
1795         ) {
1796                 if ( $title === null ) {
1797                         $title = $this->getTitle();
1798                 }
1799                 if ( !$title ) {
1800                         throw new MWException( 'Title is null' );
1801                 }
1802                 $this->addWikiTextTitleInternal( $text, $title, $linestart, /*interface*/false );
1803         }
1804
1805         /**
1806          * Add wikitext with a custom Title object.
1807          * Output is unwrapped.
1808          *
1809          * @param string $text Wikitext
1810          * @param Title $title
1811          * @param bool $linestart Is this the start of a line?
1812          * @param bool $tidy Whether to use tidy.
1813          *             Setting this to false (or omitting it) is deprecated
1814          *             since 1.32; all wikitext should be tidied.
1815          * @param bool $interface Whether it is an interface message
1816          *   (for example disables conversion)
1817          * @param string $wrapperClass if not empty, wraps the output in
1818          *   a `<div class="$wrapperClass">`
1819          * @private
1820          */
1821         private function addWikiTextTitleInternal(
1822                 $text, Title $title, $linestart, $interface, $wrapperClass = null
1823         ) {
1824                 $parserOutput = $this->parseInternal(
1825                         $text, $title, $linestart, true, $interface, /*language*/null
1826                 );
1827
1828                 $this->addParserOutput( $parserOutput, [
1829                         'enableSectionEditLinks' => false,
1830                         'wrapperDivClass' => $wrapperClass ?? '',
1831                 ] );
1832         }
1833
1834         /**
1835          * Add all metadata associated with a ParserOutput object, but without the actual HTML. This
1836          * includes categories, language links, ResourceLoader modules, effects of certain magic words,
1837          * and so on.
1838          *
1839          * @since 1.24
1840          * @param ParserOutput $parserOutput
1841          */
1842         public function addParserOutputMetadata( ParserOutput $parserOutput ) {
1843                 $this->mLanguageLinks =
1844                         array_merge( $this->mLanguageLinks, $parserOutput->getLanguageLinks() );
1845                 $this->addCategoryLinks( $parserOutput->getCategories() );
1846                 $this->setIndicators( $parserOutput->getIndicators() );
1847                 $this->mNewSectionLink = $parserOutput->getNewSection();
1848                 $this->mHideNewSectionLink = $parserOutput->getHideNewSection();
1849
1850                 if ( !$parserOutput->isCacheable() ) {
1851                         $this->enableClientCache( false );
1852                 }
1853                 $this->mNoGallery = $parserOutput->getNoGallery();
1854                 $this->mHeadItems = array_merge( $this->mHeadItems, $parserOutput->getHeadItems() );
1855                 $this->addModules( $parserOutput->getModules() );
1856                 $this->addModuleStyles( $parserOutput->getModuleStyles() );
1857                 $this->addJsConfigVars( $parserOutput->getJsConfigVars() );
1858                 $this->mPreventClickjacking = $this->mPreventClickjacking
1859                         || $parserOutput->preventClickjacking();
1860
1861                 // Template versioning...
1862                 foreach ( (array)$parserOutput->getTemplateIds() as $ns => $dbks ) {
1863                         if ( isset( $this->mTemplateIds[$ns] ) ) {
1864                                 $this->mTemplateIds[$ns] = $dbks + $this->mTemplateIds[$ns];
1865                         } else {
1866                                 $this->mTemplateIds[$ns] = $dbks;
1867                         }
1868                 }
1869                 // File versioning...
1870                 foreach ( (array)$parserOutput->getFileSearchOptions() as $dbk => $data ) {
1871                         $this->mImageTimeKeys[$dbk] = $data;
1872                 }
1873
1874                 // Hooks registered in the object
1875                 $parserOutputHooks = $this->getConfig()->get( 'ParserOutputHooks' );
1876                 foreach ( $parserOutput->getOutputHooks() as $hookInfo ) {
1877                         list( $hookName, $data ) = $hookInfo;
1878                         if ( isset( $parserOutputHooks[$hookName] ) ) {
1879                                 $parserOutputHooks[$hookName]( $this, $parserOutput, $data );
1880                         }
1881                 }
1882
1883                 // Enable OOUI if requested via ParserOutput
1884                 if ( $parserOutput->getEnableOOUI() ) {
1885                         $this->enableOOUI();
1886                 }
1887
1888                 // Include parser limit report
1889                 if ( !$this->limitReportJSData ) {
1890                         $this->limitReportJSData = $parserOutput->getLimitReportJSData();
1891                 }
1892
1893                 // Link flags are ignored for now, but may in the future be
1894                 // used to mark individual language links.
1895                 $linkFlags = [];
1896                 // Avoid PHP 7.1 warning of passing $this by reference
1897                 $outputPage = $this;
1898                 Hooks::run( 'LanguageLinks', [ $this->getTitle(), &$this->mLanguageLinks, &$linkFlags ] );
1899                 Hooks::runWithoutAbort( 'OutputPageParserOutput', [ &$outputPage, $parserOutput ] );
1900
1901                 // This check must be after 'OutputPageParserOutput' runs in addParserOutputMetadata
1902                 // so that extensions may modify ParserOutput to toggle TOC.
1903                 // This cannot be moved to addParserOutputText because that is not
1904                 // called by EditPage for Preview.
1905                 if ( $parserOutput->getTOCHTML() ) {
1906                         $this->mEnableTOC = true;
1907                 }
1908         }
1909
1910         /**
1911          * Add the HTML and enhancements for it (like ResourceLoader modules) associated with a
1912          * ParserOutput object, without any other metadata.
1913          *
1914          * @since 1.24
1915          * @param ParserOutput $parserOutput
1916          * @param array $poOptions Options to ParserOutput::getText()
1917          */
1918         public function addParserOutputContent( ParserOutput $parserOutput, $poOptions = [] ) {
1919                 $this->addParserOutputText( $parserOutput, $poOptions );
1920
1921                 $this->addModules( $parserOutput->getModules() );
1922                 $this->addModuleStyles( $parserOutput->getModuleStyles() );
1923
1924                 $this->addJsConfigVars( $parserOutput->getJsConfigVars() );
1925         }
1926
1927         /**
1928          * Add the HTML associated with a ParserOutput object, without any metadata.
1929          *
1930          * @since 1.24
1931          * @param ParserOutput $parserOutput
1932          * @param array $poOptions Options to ParserOutput::getText()
1933          */
1934         public function addParserOutputText( ParserOutput $parserOutput, $poOptions = [] ) {
1935                 $text = $parserOutput->getText( $poOptions );
1936                 // Avoid PHP 7.1 warning of passing $this by reference
1937                 $outputPage = $this;
1938                 Hooks::runWithoutAbort( 'OutputPageBeforeHTML', [ &$outputPage, &$text ] );
1939                 $this->addHTML( $text );
1940         }
1941
1942         /**
1943          * Add everything from a ParserOutput object.
1944          *
1945          * @param ParserOutput $parserOutput
1946          * @param array $poOptions Options to ParserOutput::getText()
1947          */
1948         function addParserOutput( ParserOutput $parserOutput, $poOptions = [] ) {
1949                 $this->addParserOutputMetadata( $parserOutput );
1950                 $this->addParserOutputText( $parserOutput, $poOptions );
1951         }
1952
1953         /**
1954          * Add the output of a QuickTemplate to the output buffer
1955          *
1956          * @param QuickTemplate &$template
1957          */
1958         public function addTemplate( &$template ) {
1959                 $this->addHTML( $template->getHTML() );
1960         }
1961
1962         /**
1963          * Parse wikitext and return the HTML.
1964          *
1965          * @todo The output is wrapped in a <div> iff $interface is false; it's
1966          * probably best to always strip the wrapper.
1967          *
1968          * @param string $text
1969          * @param bool $linestart Is this the start of a line?
1970          * @param bool $interface Use interface language (instead of content language) while parsing
1971          *   language sensitive magic words like GRAMMAR and PLURAL.  This also disables
1972          *   LanguageConverter.
1973          * @param Language|null $language Target language object, will override $interface
1974          * @throws MWException
1975          * @return string HTML
1976          * @deprecated since 1.32, due to untidy output and inconsistent wrapper;
1977          *  use parseAsContent() if $interface is default value or false, or else
1978          *  parseAsInterface() if $interface is true.
1979          */
1980         public function parse( $text, $linestart = true, $interface = false, $language = null ) {
1981                 wfDeprecated( __METHOD__, '1.33' );
1982                 return $this->parseInternal(
1983                         $text, $this->getTitle(), $linestart, /*tidy*/false, $interface, $language
1984                 )->getText( [
1985                         'enableSectionEditLinks' => false,
1986                 ] );
1987         }
1988
1989         /**
1990          * Parse wikitext *in the page content language* and return the HTML.
1991          * The result will be language-converted to the user's preferred variant.
1992          * Output will be tidy.
1993          *
1994          * @param string $text Wikitext in the page content language
1995          * @param bool $linestart Is this the start of a line? (Defaults to true)
1996          * @throws MWException
1997          * @return string HTML
1998          * @since 1.32
1999          */
2000         public function parseAsContent( $text, $linestart = true ) {
2001                 return $this->parseInternal(
2002                         $text, $this->getTitle(), $linestart, /*tidy*/true, /*interface*/false, /*language*/null
2003                 )->getText( [
2004                         'enableSectionEditLinks' => false,
2005                         'wrapperDivClass' => ''
2006                 ] );
2007         }
2008
2009         /**
2010          * Parse wikitext *in the user interface language* and return the HTML.
2011          * The result will not be language-converted, as user interface messages
2012          * are already localized into a specific variant.
2013          * Output will be tidy.
2014          *
2015          * @param string $text Wikitext in the user interface language
2016          * @param bool $linestart Is this the start of a line? (Defaults to true)
2017          * @throws MWException
2018          * @return string HTML
2019          * @since 1.32
2020          */
2021         public function parseAsInterface( $text, $linestart = true ) {
2022                 return $this->parseInternal(
2023                         $text, $this->getTitle(), $linestart, /*tidy*/true, /*interface*/true, /*language*/null
2024                 )->getText( [
2025                         'enableSectionEditLinks' => false,
2026                         'wrapperDivClass' => ''
2027                 ] );
2028         }
2029
2030         /**
2031          * Parse wikitext *in the user interface language*, strip
2032          * paragraph wrapper, and return the HTML.
2033          * The result will not be language-converted, as user interface messages
2034          * are already localized into a specific variant.
2035          * Output will be tidy.  Outer paragraph wrapper will only be stripped
2036          * if the result is a single paragraph.
2037          *
2038          * @param string $text Wikitext in the user interface language
2039          * @param bool $linestart Is this the start of a line? (Defaults to true)
2040          * @throws MWException
2041          * @return string HTML
2042          * @since 1.32
2043          */
2044         public function parseInlineAsInterface( $text, $linestart = true ) {
2045                 return Parser::stripOuterParagraph(
2046                         $this->parseAsInterface( $text, $linestart )
2047                 );
2048         }
2049
2050         /**
2051          * Parse wikitext, strip paragraph wrapper, and return the HTML.
2052          *
2053          * @param string $text
2054          * @param bool $linestart Is this the start of a line?
2055          * @param bool $interface Use interface language (instead of content language) while parsing
2056          *   language sensitive magic words like GRAMMAR and PLURAL
2057          * @return string HTML
2058          * @deprecated since 1.32, due to untidy output and confusing default
2059          *   for $interface.  Use parseInlineAsInterface() if $interface is
2060          *   the default value or false, or else use
2061          *   Parser::stripOuterParagraph($outputPage->parseAsContent(...)).
2062          */
2063         public function parseInline( $text, $linestart = true, $interface = false ) {
2064                 wfDeprecated( __METHOD__, '1.33' );
2065                 $parsed = $this->parseInternal(
2066                         $text, $this->getTitle(), $linestart, /*tidy*/false, $interface, /*language*/null
2067                 )->getText( [
2068                         'enableSectionEditLinks' => false,
2069                         'wrapperDivClass' => '', /* no wrapper div */
2070                 ] );
2071                 return Parser::stripOuterParagraph( $parsed );
2072         }
2073
2074         /**
2075          * Parse wikitext and return the HTML (internal implementation helper)
2076          *
2077          * @param string $text
2078          * @param Title $title The title to use
2079          * @param bool $linestart Is this the start of a line?
2080          * @param bool $tidy Whether the output should be tidied
2081          * @param bool $interface Use interface language (instead of content language) while parsing
2082          *   language sensitive magic words like GRAMMAR and PLURAL.  This also disables
2083          *   LanguageConverter.
2084          * @param Language|null $language Target language object, will override $interface
2085          * @throws MWException
2086          * @return ParserOutput
2087          */
2088         private function parseInternal( $text, $title, $linestart, $tidy, $interface, $language ) {
2089                 if ( is_null( $title ) ) {
2090                         throw new MWException( 'Empty $mTitle in ' . __METHOD__ );
2091                 }
2092
2093                 $popts = $this->parserOptions();
2094                 $oldTidy = $popts->setTidy( $tidy );
2095                 $oldInterface = $popts->setInterfaceMessage( (bool)$interface );
2096
2097                 if ( $language !== null ) {
2098                         $oldLang = $popts->setTargetLanguage( $language );
2099                 }
2100
2101                 $parserOutput = MediaWikiServices::getInstance()->getParser()->getFreshParser()->parse(
2102                         $text, $title, $popts,
2103                         $linestart, true, $this->mRevisionId
2104                 );
2105
2106                 $popts->setTidy( $oldTidy );
2107                 $popts->setInterfaceMessage( $oldInterface );
2108
2109                 if ( $language !== null ) {
2110                         $popts->setTargetLanguage( $oldLang );
2111                 }
2112
2113                 return $parserOutput;
2114         }
2115
2116         /**
2117          * Set the value of the "s-maxage" part of the "Cache-control" HTTP header
2118          *
2119          * @param int $maxage Maximum cache time on the CDN, in seconds.
2120          */
2121         public function setCdnMaxage( $maxage ) {
2122                 $this->mCdnMaxage = min( $maxage, $this->mCdnMaxageLimit );
2123         }
2124
2125         /**
2126          * Set the value of the "s-maxage" part of the "Cache-control" HTTP header to $maxage if that is
2127          * lower than the current s-maxage.  Either way, $maxage is now an upper limit on s-maxage, so
2128          * that future calls to setCdnMaxage() will no longer be able to raise the s-maxage above
2129          * $maxage.
2130          *
2131          * @param int $maxage Maximum cache time on the CDN, in seconds
2132          * @since 1.27
2133          */
2134         public function lowerCdnMaxage( $maxage ) {
2135                 $this->mCdnMaxageLimit = min( $maxage, $this->mCdnMaxageLimit );
2136                 $this->setCdnMaxage( $this->mCdnMaxage );
2137         }
2138
2139         /**
2140          * Get TTL in [$minTTL,$maxTTL] in pass it to lowerCdnMaxage()
2141          *
2142          * This sets and returns $minTTL if $mtime is false or null. Otherwise,
2143          * the TTL is higher the older the $mtime timestamp is. Essentially, the
2144          * TTL is 90% of the age of the object, subject to the min and max.
2145          *
2146          * @param string|int|float|bool|null $mtime Last-Modified timestamp
2147          * @param int $minTTL Minimum TTL in seconds [default: 1 minute]
2148          * @param int $maxTTL Maximum TTL in seconds [default: $wgCdnMaxAge]
2149          * @since 1.28
2150          */
2151         public function adaptCdnTTL( $mtime, $minTTL = 0, $maxTTL = 0 ) {
2152                 $minTTL = $minTTL ?: IExpiringStore::TTL_MINUTE;
2153                 $maxTTL = $maxTTL ?: $this->getConfig()->get( 'CdnMaxAge' );
2154
2155                 if ( $mtime === null || $mtime === false ) {
2156                         return $minTTL; // entity does not exist
2157                 }
2158
2159                 $age = MWTimestamp::time() - wfTimestamp( TS_UNIX, $mtime );
2160                 $adaptiveTTL = max( 0.9 * $age, $minTTL );
2161                 $adaptiveTTL = min( $adaptiveTTL, $maxTTL );
2162
2163                 $this->lowerCdnMaxage( (int)$adaptiveTTL );
2164         }
2165
2166         /**
2167          * Use enableClientCache(false) to force it to send nocache headers
2168          *
2169          * @param bool|null $state New value, or null to not set the value
2170          *
2171          * @return bool Old value
2172          */
2173         public function enableClientCache( $state ) {
2174                 return wfSetVar( $this->mEnableClientCache, $state );
2175         }
2176
2177         /**
2178          * Get the list of cookie names that will influence the cache
2179          *
2180          * @return array
2181          */
2182         function getCacheVaryCookies() {
2183                 if ( self::$cacheVaryCookies === null ) {
2184                         $config = $this->getConfig();
2185                         self::$cacheVaryCookies = array_values( array_unique( array_merge(
2186                                 SessionManager::singleton()->getVaryCookies(),
2187                                 [
2188                                         'forceHTTPS',
2189                                 ],
2190                                 $config->get( 'CacheVaryCookies' )
2191                         ) ) );
2192                         Hooks::run( 'GetCacheVaryCookies', [ $this, &self::$cacheVaryCookies ] );
2193                 }
2194                 return self::$cacheVaryCookies;
2195         }
2196
2197         /**
2198          * Check if the request has a cache-varying cookie header
2199          * If it does, it's very important that we don't allow public caching
2200          *
2201          * @return bool
2202          */
2203         function haveCacheVaryCookies() {
2204                 $request = $this->getRequest();
2205                 foreach ( $this->getCacheVaryCookies() as $cookieName ) {
2206                         if ( $request->getCookie( $cookieName, '', '' ) !== '' ) {
2207                                 wfDebug( __METHOD__ . ": found $cookieName\n" );
2208                                 return true;
2209                         }
2210                 }
2211                 wfDebug( __METHOD__ . ": no cache-varying cookies found\n" );
2212                 return false;
2213         }
2214
2215         /**
2216          * Add an HTTP header that will influence on the cache
2217          *
2218          * @param string $header Header name
2219          * @param string[]|null $option Deprecated; formerly options for the
2220          *  Key header, deprecated in 1.32 and removed in 1.34. See
2221          *   https://datatracker.ietf.org/doc/draft-fielding-http-key/
2222          *   for the list of formerly-valid options.
2223          */
2224         public function addVaryHeader( $header, array $option = null ) {
2225                 if ( $option !== null && count( $option ) > 0 ) {
2226                         wfDeprecated( 'addVaryHeader $option is ignored', '1.34' );
2227                 }
2228                 if ( !array_key_exists( $header, $this->mVaryHeader ) ) {
2229                         $this->mVaryHeader[$header] = null;
2230                 }
2231         }
2232
2233         /**
2234          * Return a Vary: header on which to vary caches. Based on the keys of $mVaryHeader,
2235          * such as Accept-Encoding or Cookie
2236          *
2237          * @return string
2238          */
2239         public function getVaryHeader() {
2240                 // If we vary on cookies, let's make sure it's always included here too.
2241                 if ( $this->getCacheVaryCookies() ) {
2242                         $this->addVaryHeader( 'Cookie' );
2243                 }
2244
2245                 foreach ( SessionManager::singleton()->getVaryHeaders() as $header => $options ) {
2246                         $this->addVaryHeader( $header, $options );
2247                 }
2248                 return 'Vary: ' . implode( ', ', array_keys( $this->mVaryHeader ) );
2249         }
2250
2251         /**
2252          * Add an HTTP Link: header
2253          *
2254          * @param string $header Header value
2255          */
2256         public function addLinkHeader( $header ) {
2257                 $this->mLinkHeader[] = $header;
2258         }
2259
2260         /**
2261          * Return a Link: header. Based on the values of $mLinkHeader.
2262          *
2263          * @return string
2264          */
2265         public function getLinkHeader() {
2266                 if ( !$this->mLinkHeader ) {
2267                         return false;
2268                 }
2269
2270                 return 'Link: ' . implode( ',', $this->mLinkHeader );
2271         }
2272
2273         /**
2274          * T23672: Add Accept-Language to Vary header if there's no 'variant' parameter in GET.
2275          *
2276          * For example:
2277          *   /w/index.php?title=Main_page will vary based on Accept-Language; but
2278          *   /w/index.php?title=Main_page&variant=zh-cn will not.
2279          */
2280         private function addAcceptLanguage() {
2281                 $title = $this->getTitle();
2282                 if ( !$title instanceof Title ) {
2283                         return;
2284                 }
2285
2286                 $lang = $title->getPageLanguage();
2287                 if ( !$this->getRequest()->getCheck( 'variant' ) && $lang->hasVariants() ) {
2288                         $this->addVaryHeader( 'Accept-Language' );
2289                 }
2290         }
2291
2292         /**
2293          * Set a flag which will cause an X-Frame-Options header appropriate for
2294          * edit pages to be sent. The header value is controlled by
2295          * $wgEditPageFrameOptions.
2296          *
2297          * This is the default for special pages. If you display a CSRF-protected
2298          * form on an ordinary view page, then you need to call this function.
2299          *
2300          * @param bool $enable
2301          */
2302         public function preventClickjacking( $enable = true ) {
2303                 $this->mPreventClickjacking = $enable;
2304         }
2305
2306         /**
2307          * Turn off frame-breaking. Alias for $this->preventClickjacking(false).
2308          * This can be called from pages which do not contain any CSRF-protected
2309          * HTML form.
2310          */
2311         public function allowClickjacking() {
2312                 $this->mPreventClickjacking = false;
2313         }
2314
2315         /**
2316          * Get the prevent-clickjacking flag
2317          *
2318          * @since 1.24
2319          * @return bool
2320          */
2321         public function getPreventClickjacking() {
2322                 return $this->mPreventClickjacking;
2323         }
2324
2325         /**
2326          * Get the X-Frame-Options header value (without the name part), or false
2327          * if there isn't one. This is used by Skin to determine whether to enable
2328          * JavaScript frame-breaking, for clients that don't support X-Frame-Options.
2329          *
2330          * @return string|false
2331          */
2332         public function getFrameOptions() {
2333                 $config = $this->getConfig();
2334                 if ( $config->get( 'BreakFrames' ) ) {
2335                         return 'DENY';
2336                 } elseif ( $this->mPreventClickjacking && $config->get( 'EditPageFrameOptions' ) ) {
2337                         return $config->get( 'EditPageFrameOptions' );
2338                 }
2339                 return false;
2340         }
2341
2342         /**
2343          * Get the Origin-Trial header values. This is used to enable Chrome Origin
2344          * Trials: https://github.com/GoogleChrome/OriginTrials
2345          *
2346          * @return array
2347          */
2348         private function getOriginTrials() {
2349                 $config = $this->getConfig();
2350
2351                 return $config->get( 'OriginTrials' );
2352         }
2353
2354         private function getReportTo() {
2355                 $config = $this->getConfig();
2356
2357                 $expiry = $config->get( 'ReportToExpiry' );
2358
2359                 if ( !$expiry ) {
2360                         return false;
2361                 }
2362
2363                 $endpoints = $config->get( 'ReportToEndpoints' );
2364
2365                 if ( !$endpoints ) {
2366                         return false;
2367                 }
2368
2369                 $output = [ 'max_age' => $expiry, 'endpoints' => [] ];
2370
2371                 foreach ( $endpoints as $endpoint ) {
2372                         $output['endpoints'][] = [ 'url' => $endpoint ];
2373                 }
2374
2375                 return json_encode( $output, JSON_UNESCAPED_SLASHES );
2376         }
2377
2378         private function getFeaturePolicyReportOnly() {
2379                 $config = $this->getConfig();
2380
2381                 $features = $config->get( 'FeaturePolicyReportOnly' );
2382                 return implode( ';', $features );
2383         }
2384
2385         /**
2386          * Send cache control HTTP headers
2387          */
2388         public function sendCacheControl() {
2389                 $response = $this->getRequest()->response();
2390                 $config = $this->getConfig();
2391
2392                 $this->addVaryHeader( 'Cookie' );
2393                 $this->addAcceptLanguage();
2394
2395                 # don't serve compressed data to clients who can't handle it
2396                 # maintain different caches for logged-in users and non-logged in ones
2397                 $response->header( $this->getVaryHeader() );
2398
2399                 if ( $this->mEnableClientCache ) {
2400                         if (
2401                                 $config->get( 'UseCdn' ) &&
2402                                 !$response->hasCookies() &&
2403                                 !SessionManager::getGlobalSession()->isPersistent() &&
2404                                 !$this->isPrintable() &&
2405                                 $this->mCdnMaxage != 0 &&
2406                                 !$this->haveCacheVaryCookies()
2407                         ) {
2408                                 if ( $config->get( 'UseESI' ) ) {
2409                                         wfDeprecated( '$wgUseESI = true', '1.33' );
2410                                         # We'll purge the proxy cache explicitly, but require end user agents
2411                                         # to revalidate against the proxy on each visit.
2412                                         # Surrogate-Control controls our CDN, Cache-Control downstream caches
2413                                         wfDebug( __METHOD__ .
2414                                                 ": proxy caching with ESI; {$this->mLastModified} **", 'private' );
2415                                         # start with a shorter timeout for initial testing
2416                                         # header( 'Surrogate-Control: max-age=2678400+2678400, content="ESI/1.0"');
2417                                         $response->header(
2418                                                 "Surrogate-Control: max-age={$config->get( 'CdnMaxAge' )}" .
2419                                                 "+{$this->mCdnMaxage}, content=\"ESI/1.0\""
2420                                         );
2421                                         $response->header( 'Cache-Control: s-maxage=0, must-revalidate, max-age=0' );
2422                                 } else {
2423                                         # We'll purge the proxy cache for anons explicitly, but require end user agents
2424                                         # to revalidate against the proxy on each visit.
2425                                         # IMPORTANT! The CDN needs to replace the Cache-Control header with
2426                                         # Cache-Control: s-maxage=0, must-revalidate, max-age=0
2427                                         wfDebug( __METHOD__ .
2428                                                 ": local proxy caching; {$this->mLastModified} **", 'private' );
2429                                         # start with a shorter timeout for initial testing
2430                                         # header( "Cache-Control: s-maxage=2678400, must-revalidate, max-age=0" );
2431                                         $response->header( "Cache-Control: " .
2432                                                 "s-maxage={$this->mCdnMaxage}, must-revalidate, max-age=0" );
2433                                 }
2434                         } else {
2435                                 # We do want clients to cache if they can, but they *must* check for updates
2436                                 # on revisiting the page.
2437                                 wfDebug( __METHOD__ . ": private caching; {$this->mLastModified} **", 'private' );
2438                                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
2439                                 $response->header( "Cache-Control: private, must-revalidate, max-age=0" );
2440                         }
2441                         if ( $this->mLastModified ) {
2442                                 $response->header( "Last-Modified: {$this->mLastModified}" );
2443                         }
2444                 } else {
2445                         wfDebug( __METHOD__ . ": no caching **", 'private' );
2446
2447                         # In general, the absence of a last modified header should be enough to prevent
2448                         # the client from using its cache. We send a few other things just to make sure.
2449                         $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
2450                         $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
2451                         $response->header( 'Pragma: no-cache' );
2452                 }
2453         }
2454
2455         /**
2456          * Transfer styles and JavaScript modules from skin.
2457          *
2458          * @param Skin $sk to load modules for
2459          */
2460         public function loadSkinModules( $sk ) {
2461                 foreach ( $sk->getDefaultModules() as $group => $modules ) {
2462                         if ( $group === 'styles' ) {
2463                                 foreach ( $modules as $key => $moduleMembers ) {
2464                                         $this->addModuleStyles( $moduleMembers );
2465                                 }
2466                         } else {
2467                                 $this->addModules( $modules );
2468                         }
2469                 }
2470         }
2471
2472         /**
2473          * Finally, all the text has been munged and accumulated into
2474          * the object, let's actually output it:
2475          *
2476          * @param bool $return Set to true to get the result as a string rather than sending it
2477          * @return string|null
2478          * @throws Exception
2479          * @throws FatalError
2480          * @throws MWException
2481          */
2482         public function output( $return = false ) {
2483                 if ( $this->mDoNothing ) {
2484                         return $return ? '' : null;
2485                 }
2486
2487                 $response = $this->getRequest()->response();
2488                 $config = $this->getConfig();
2489
2490                 if ( $this->mRedirect != '' ) {
2491                         # Standards require redirect URLs to be absolute
2492                         $this->mRedirect = wfExpandUrl( $this->mRedirect, PROTO_CURRENT );
2493
2494                         $redirect = $this->mRedirect;
2495                         $code = $this->mRedirectCode;
2496
2497                         if ( Hooks::run( "BeforePageRedirect", [ $this, &$redirect, &$code ] ) ) {
2498                                 if ( $code == '301' || $code == '303' ) {
2499                                         if ( !$config->get( 'DebugRedirects' ) ) {
2500                                                 $response->statusHeader( $code );
2501                                         }
2502                                         $this->mLastModified = wfTimestamp( TS_RFC2822 );
2503                                 }
2504                                 if ( $config->get( 'VaryOnXFP' ) ) {
2505                                         $this->addVaryHeader( 'X-Forwarded-Proto' );
2506                                 }
2507                                 $this->sendCacheControl();
2508
2509                                 $response->header( "Content-Type: text/html; charset=utf-8" );
2510                                 if ( $config->get( 'DebugRedirects' ) ) {
2511                                         $url = htmlspecialchars( $redirect );
2512                                         print "<!DOCTYPE html>\n<html>\n<head>\n<title>Redirect</title>\n</head>\n<body>\n";
2513                                         print "<p>Location: <a href=\"$url\">$url</a></p>\n";
2514                                         print "</body>\n</html>\n";
2515                                 } else {
2516                                         $response->header( 'Location: ' . $redirect );
2517                                 }
2518                         }
2519
2520                         return $return ? '' : null;
2521                 } elseif ( $this->mStatusCode ) {
2522                         $response->statusHeader( $this->mStatusCode );
2523                 }
2524
2525                 # Buffer output; final headers may depend on later processing
2526                 ob_start();
2527
2528                 $response->header( 'Content-type: ' . $config->get( 'MimeType' ) . '; charset=UTF-8' );
2529                 $response->header( 'Content-language: ' .
2530                         MediaWikiServices::getInstance()->getContentLanguage()->getHtmlCode() );
2531
2532                 $linkHeader = $this->getLinkHeader();
2533                 if ( $linkHeader ) {
2534                         $response->header( $linkHeader );
2535                 }
2536
2537                 // Prevent framing, if requested
2538                 $frameOptions = $this->getFrameOptions();
2539                 if ( $frameOptions ) {
2540                         $response->header( "X-Frame-Options: $frameOptions" );
2541                 }
2542
2543                 $originTrials = $this->getOriginTrials();
2544                 foreach ( $originTrials as $originTrial ) {
2545                         $response->header( "Origin-Trial: $originTrial", false );
2546                 }
2547
2548                 $reportTo = $this->getReportTo();
2549                 if ( $reportTo ) {
2550                         $response->header( "Report-To: $reportTo" );
2551                 }
2552
2553                 $featurePolicyReportOnly = $this->getFeaturePolicyReportOnly();
2554                 if ( $featurePolicyReportOnly ) {
2555                         $response->header( "Feature-Policy-Report-Only: $featurePolicyReportOnly" );
2556                 }
2557
2558                 ContentSecurityPolicy::sendHeaders( $this );
2559
2560                 if ( $this->mArticleBodyOnly ) {
2561                         echo $this->mBodytext;
2562                 } else {
2563                         // Enable safe mode if requested (T152169)
2564                         if ( $this->getRequest()->getBool( 'safemode' ) ) {
2565                                 $this->disallowUserJs();
2566                         }
2567
2568                         $sk = $this->getSkin();
2569                         $this->loadSkinModules( $sk );
2570
2571                         MWDebug::addModules( $this );
2572
2573                         // Avoid PHP 7.1 warning of passing $this by reference
2574                         $outputPage = $this;
2575                         // Hook that allows last minute changes to the output page, e.g.
2576                         // adding of CSS or Javascript by extensions.
2577                         Hooks::runWithoutAbort( 'BeforePageDisplay', [ &$outputPage, &$sk ] );
2578
2579                         try {
2580                                 $sk->outputPage();
2581                         } catch ( Exception $e ) {
2582                                 ob_end_clean(); // bug T129657
2583                                 throw $e;
2584                         }
2585                 }
2586
2587                 try {
2588                         // This hook allows last minute changes to final overall output by modifying output buffer
2589                         Hooks::runWithoutAbort( 'AfterFinalPageOutput', [ $this ] );
2590                 } catch ( Exception $e ) {
2591                         ob_end_clean(); // bug T129657
2592                         throw $e;
2593                 }
2594
2595                 $this->sendCacheControl();
2596
2597                 if ( $return ) {
2598                         return ob_get_clean();
2599                 } else {
2600                         ob_end_flush();
2601                         return null;
2602                 }
2603         }
2604
2605         /**
2606          * Prepare this object to display an error page; disable caching and
2607          * indexing, clear the current text and redirect, set the page's title
2608          * and optionally an custom HTML title (content of the "<title>" tag).
2609          *
2610          * @param string|Message $pageTitle Will be passed directly to setPageTitle()
2611          * @param string|Message $htmlTitle Will be passed directly to setHTMLTitle();
2612          *                   optional, if not passed the "<title>" attribute will be
2613          *                   based on $pageTitle
2614          */
2615         public function prepareErrorPage( $pageTitle, $htmlTitle = false ) {
2616                 $this->setPageTitle( $pageTitle );
2617                 if ( $htmlTitle !== false ) {
2618                         $this->setHTMLTitle( $htmlTitle );
2619                 }
2620                 $this->setRobotPolicy( 'noindex,nofollow' );
2621                 $this->setArticleRelated( false );
2622                 $this->enableClientCache( false );
2623                 $this->mRedirect = '';
2624                 $this->clearSubtitle();
2625                 $this->clearHTML();
2626         }
2627
2628         /**
2629          * Output a standard error page
2630          *
2631          * showErrorPage( 'titlemsg', 'pagetextmsg' );
2632          * showErrorPage( 'titlemsg', 'pagetextmsg', [ 'param1', 'param2' ] );
2633          * showErrorPage( 'titlemsg', $messageObject );
2634          * showErrorPage( $titleMessageObject, $messageObject );
2635          *
2636          * @param string|Message $title Message key (string) for page title, or a Message object
2637          * @param string|Message $msg Message key (string) for page text, or a Message object
2638          * @param array $params Message parameters; ignored if $msg is a Message object
2639          */
2640         public function showErrorPage( $title, $msg, $params = [] ) {
2641                 if ( !$title instanceof Message ) {
2642                         $title = $this->msg( $title );
2643                 }
2644
2645                 $this->prepareErrorPage( $title );
2646
2647                 if ( $msg instanceof Message ) {
2648                         if ( $params !== [] ) {
2649                                 trigger_error( 'Argument ignored: $params. The message parameters argument '
2650                                         . 'is discarded when the $msg argument is a Message object instead of '
2651                                         . 'a string.', E_USER_NOTICE );
2652                         }
2653                         $this->addHTML( $msg->parseAsBlock() );
2654                 } else {
2655                         $this->addWikiMsgArray( $msg, $params );
2656                 }
2657
2658                 $this->returnToMain();
2659         }
2660
2661         /**
2662          * Output a standard permission error page
2663          *
2664          * @param array $errors Error message keys or [key, param...] arrays
2665          * @param string|null $action Action that was denied or null if unknown
2666          */
2667         public function showPermissionsErrorPage( array $errors, $action = null ) {
2668                 foreach ( $errors as $key => $error ) {
2669                         $errors[$key] = (array)$error;
2670                 }
2671
2672                 // For some action (read, edit, create and upload), display a "login to do this action"
2673                 // error if all of the following conditions are met:
2674                 // 1. the user is not logged in
2675                 // 2. the only error is insufficient permissions (i.e. no block or something else)
2676                 // 3. the error can be avoided simply by logging in
2677                 if ( in_array( $action, [ 'read', 'edit', 'createpage', 'createtalk', 'upload' ] )
2678                         && $this->getUser()->isAnon() && count( $errors ) == 1 && isset( $errors[0][0] )
2679                         && ( $errors[0][0] == 'badaccess-groups' || $errors[0][0] == 'badaccess-group0' )
2680                         && ( User::groupHasPermission( 'user', $action )
2681                         || User::groupHasPermission( 'autoconfirmed', $action ) )
2682                 ) {
2683                         $displayReturnto = null;
2684
2685                         # Due to T34276, if a user does not have read permissions,
2686                         # $this->getTitle() will just give Special:Badtitle, which is
2687                         # not especially useful as a returnto parameter. Use the title
2688                         # from the request instead, if there was one.
2689                         $request = $this->getRequest();
2690                         $returnto = Title::newFromText( $request->getVal( 'title', '' ) );
2691                         if ( $action == 'edit' ) {
2692                                 $msg = 'whitelistedittext';
2693                                 $displayReturnto = $returnto;
2694                         } elseif ( $action == 'createpage' || $action == 'createtalk' ) {
2695                                 $msg = 'nocreatetext';
2696                         } elseif ( $action == 'upload' ) {
2697                                 $msg = 'uploadnologintext';
2698                         } else { # Read
2699                                 $msg = 'loginreqpagetext';
2700                                 $displayReturnto = Title::newMainPage();
2701                         }
2702
2703                         $query = [];
2704
2705                         if ( $returnto ) {
2706                                 $query['returnto'] = $returnto->getPrefixedText();
2707
2708                                 if ( !$request->wasPosted() ) {
2709                                         $returntoquery = $request->getValues();
2710                                         unset( $returntoquery['title'] );
2711                                         unset( $returntoquery['returnto'] );
2712                                         unset( $returntoquery['returntoquery'] );
2713                                         $query['returntoquery'] = wfArrayToCgi( $returntoquery );
2714                                 }
2715                         }
2716
2717                         $services = MediaWikiServices::getInstance();
2718
2719                         $title = SpecialPage::getTitleFor( 'Userlogin' );
2720                         $linkRenderer = $services->getLinkRenderer();
2721                         $loginUrl = $title->getLinkURL( $query, false, PROTO_RELATIVE );
2722                         $loginLink = $linkRenderer->makeKnownLink(
2723                                 $title,
2724                                 $this->msg( 'loginreqlink' )->text(),
2725                                 [],
2726                                 $query
2727                         );
2728
2729                         $this->prepareErrorPage( $this->msg( 'loginreqtitle' ) );
2730                         $this->addHTML( $this->msg( $msg )->rawParams( $loginLink )->params( $loginUrl )->parse() );
2731
2732                         $permissionManager = $services->getPermissionManager();
2733
2734                         # Don't return to a page the user can't read otherwise
2735                         # we'll end up in a pointless loop
2736                         if ( $displayReturnto && $permissionManager->userCan(
2737                                 'read', $this->getUser(), $displayReturnto
2738                         ) ) {
2739                                 $this->returnToMain( null, $displayReturnto );
2740                         }
2741                 } else {
2742                         $this->prepareErrorPage( $this->msg( 'permissionserrors' ) );
2743                         $this->addWikiTextAsInterface( $this->formatPermissionsErrorMessage( $errors, $action ) );
2744                 }
2745         }
2746
2747         /**
2748          * Display an error page indicating that a given version of MediaWiki is
2749          * required to use it
2750          *
2751          * @param mixed $version The version of MediaWiki needed to use the page
2752          */
2753         public function versionRequired( $version ) {
2754                 $this->prepareErrorPage( $this->msg( 'versionrequired', $version ) );
2755
2756                 $this->addWikiMsg( 'versionrequiredtext', $version );
2757                 $this->returnToMain();
2758         }
2759
2760         /**
2761          * Format a list of error messages
2762          *
2763          * @param array $errors Array of arrays returned by Title::getUserPermissionsErrors
2764          * @param string|null $action Action that was denied or null if unknown
2765          * @return string The wikitext error-messages, formatted into a list.
2766          */
2767         public function formatPermissionsErrorMessage( array $errors, $action = null ) {
2768                 if ( $action == null ) {
2769                         $text = $this->msg( 'permissionserrorstext', count( $errors ) )->plain() . "\n\n";
2770                 } else {
2771                         $action_desc = $this->msg( "action-$action" )->plain();
2772                         $text = $this->msg(
2773                                 'permissionserrorstext-withaction',
2774                                 count( $errors ),
2775                                 $action_desc
2776                         )->plain() . "\n\n";
2777                 }
2778
2779                 if ( count( $errors ) > 1 ) {
2780                         $text .= '<ul class="permissions-errors">' . "\n";
2781
2782                         foreach ( $errors as $error ) {
2783                                 $text .= '<li>';
2784                                 $text .= $this->msg( ...$error )->plain();
2785                                 $text .= "</li>\n";
2786                         }
2787                         $text .= '</ul>';
2788                 } else {
2789                         $text .= "<div class=\"permissions-errors\">\n" .
2790                                         $this->msg( ...reset( $errors ) )->plain() .
2791                                         "\n</div>";
2792                 }
2793
2794                 return $text;
2795         }
2796
2797         /**
2798          * Show a warning about replica DB lag
2799          *
2800          * If the lag is higher than $wgSlaveLagCritical seconds,
2801          * then the warning is a bit more obvious. If the lag is
2802          * lower than $wgSlaveLagWarning, then no warning is shown.
2803          *
2804          * @param int $lag Replica lag
2805          */
2806         public function showLagWarning( $lag ) {
2807                 $config = $this->getConfig();
2808                 if ( $lag >= $config->get( 'SlaveLagWarning' ) ) {
2809                         $lag = floor( $lag ); // floor to avoid nano seconds to display
2810                         $message = $lag < $config->get( 'SlaveLagCritical' )
2811                                 ? 'lag-warn-normal'
2812                                 : 'lag-warn-high';
2813                         $wrap = Html::rawElement( 'div', [ 'class' => "mw-{$message}" ], "\n$1\n" );
2814                         $this->wrapWikiMsg( "$wrap\n", [ $message, $this->getLanguage()->formatNum( $lag ) ] );
2815                 }
2816         }
2817
2818         /**
2819          * Output an error page
2820          *
2821          * @note FatalError exception class provides an alternative.
2822          * @param string $message Error to output. Must be escaped for HTML.
2823          */
2824         public function showFatalError( $message ) {
2825                 $this->prepareErrorPage( $this->msg( 'internalerror' ) );
2826
2827                 $this->addHTML( $message );
2828         }
2829
2830         /**
2831          * Add a "return to" link pointing to a specified title
2832          *
2833          * @param Title $title Title to link
2834          * @param array $query Query string parameters
2835          * @param string|null $text Text of the link (input is not escaped)
2836          * @param array $options Options array to pass to Linker
2837          */
2838         public function addReturnTo( $title, array $query = [], $text = null, $options = [] ) {
2839                 $linkRenderer = MediaWikiServices::getInstance()
2840                         ->getLinkRendererFactory()->createFromLegacyOptions( $options );
2841                 $link = $this->msg( 'returnto' )->rawParams(
2842                         $linkRenderer->makeLink( $title, $text, [], $query ) )->escaped();
2843                 $this->addHTML( "<p id=\"mw-returnto\">{$link}</p>\n" );
2844         }
2845
2846         /**
2847          * Add a "return to" link pointing to a specified title,
2848          * or the title indicated in the request, or else the main page
2849          *
2850          * @param mixed|null $unused
2851          * @param Title|string|null $returnto Title or String to return to
2852          * @param string|null $returntoquery Query string for the return to link
2853          */
2854         public function returnToMain( $unused = null, $returnto = null, $returntoquery = null ) {
2855                 if ( $returnto == null ) {
2856                         $returnto = $this->getRequest()->getText( 'returnto' );
2857                 }
2858
2859                 if ( $returntoquery == null ) {
2860                         $returntoquery = $this->getRequest()->getText( 'returntoquery' );
2861                 }
2862
2863                 if ( $returnto === '' ) {
2864                         $returnto = Title::newMainPage();
2865                 }
2866
2867                 if ( is_object( $returnto ) ) {
2868                         $titleObj = $returnto;
2869                 } else {
2870                         $titleObj = Title::newFromText( $returnto );
2871                 }
2872                 // We don't want people to return to external interwiki. That
2873                 // might potentially be used as part of a phishing scheme
2874                 if ( !is_object( $titleObj ) || $titleObj->isExternal() ) {
2875                         $titleObj = Title::newMainPage();
2876                 }
2877
2878                 $this->addReturnTo( $titleObj, wfCgiToArray( $returntoquery ) );
2879         }
2880
2881         private function getRlClientContext() {
2882                 if ( !$this->rlClientContext ) {
2883                         $query = ResourceLoader::makeLoaderQuery(
2884                                 [], // modules; not relevant
2885                                 $this->getLanguage()->getCode(),
2886                                 $this->getSkin()->getSkinName(),
2887                                 $this->getUser()->isLoggedIn() ? $this->getUser()->getName() : null,
2888                                 null, // version; not relevant
2889                                 ResourceLoader::inDebugMode(),
2890                                 null, // only; not relevant
2891                                 $this->isPrintable(),
2892                                 $this->getRequest()->getBool( 'handheld' )
2893                         );
2894                         $this->rlClientContext = new ResourceLoaderContext(
2895                                 $this->getResourceLoader(),
2896                                 new FauxRequest( $query )
2897                         );
2898                         if ( $this->contentOverrideCallbacks ) {
2899                                 $this->rlClientContext = new DerivativeResourceLoaderContext( $this->rlClientContext );
2900                                 $this->rlClientContext->setContentOverrideCallback( function ( Title $title ) {
2901                                         foreach ( $this->contentOverrideCallbacks as $callback ) {
2902                                                 $content = $callback( $title );
2903                                                 if ( $content !== null ) {
2904                                                         $text = ContentHandler::getContentText( $content );
2905                                                         if ( strpos( $text, '</script>' ) !== false ) {
2906                                                                 // Proactively replace this so that we can display a message
2907                                                                 // to the user, instead of letting it go to Html::inlineScript(),
2908                                                                 // where it would be considered a server-side issue.
2909                                                                 $titleFormatted = $title->getPrefixedText();
2910                                                                 $content = new JavaScriptContent(
2911                                                                         Xml::encodeJsCall( 'mw.log.error', [
2912                                                                                 "Cannot preview $titleFormatted due to script-closing tag."
2913                                                                         ] )
2914                                                                 );
2915                                                         }
2916                                                         return $content;
2917                                                 }
2918                                         }
2919                                         return null;
2920                                 } );
2921                         }
2922                 }
2923                 return $this->rlClientContext;
2924         }
2925
2926         /**
2927          * Call this to freeze the module queue and JS config and create a formatter.
2928          *
2929          * Depending on the Skin, this may get lazy-initialised in either headElement() or
2930          * getBottomScripts(). See SkinTemplate::prepareQuickTemplate(). Calling this too early may
2931          * cause unexpected side-effects since disallowUserJs() may be called at any time to change
2932          * the module filters retroactively. Skins and extension hooks may also add modules until very
2933          * late in the request lifecycle.
2934          *
2935          * @return ResourceLoaderClientHtml
2936          */
2937         public function getRlClient() {
2938                 if ( !$this->rlClient ) {
2939                         $context = $this->getRlClientContext();
2940                         $rl = $this->getResourceLoader();
2941                         $this->addModules( [
2942                                 'user',
2943                                 'user.options',
2944                                 'user.tokens',
2945                         ] );
2946                         $this->addModuleStyles( [
2947                                 'site.styles',
2948                                 'noscript',
2949                                 'user.styles',
2950                         ] );
2951                         $this->getSkin()->setupSkinUserCss( $this );
2952
2953                         // Prepare exempt modules for buildExemptModules()
2954                         $exemptGroups = [ 'site' => [], 'noscript' => [], 'private' => [], 'user' => [] ];
2955                         $exemptStates = [];
2956                         $moduleStyles = $this->getModuleStyles( /*filter*/ true );
2957
2958                         // Preload getTitleInfo for isKnownEmpty calls below and in ResourceLoaderClientHtml
2959                         // Separate user-specific batch for improved cache-hit ratio.
2960                         $userBatch = [ 'user.styles', 'user' ];
2961                         $siteBatch = array_diff( $moduleStyles, $userBatch );
2962                         $dbr = wfGetDB( DB_REPLICA );
2963                         ResourceLoaderWikiModule::preloadTitleInfo( $context, $dbr, $siteBatch );
2964                         ResourceLoaderWikiModule::preloadTitleInfo( $context, $dbr, $userBatch );
2965
2966                         // Filter out modules handled by buildExemptModules()
2967                         $moduleStyles = array_filter( $moduleStyles,
2968                                 function ( $name ) use ( $rl, $context, &$exemptGroups, &$exemptStates ) {
2969                                         $module = $rl->getModule( $name );
2970                                         if ( $module ) {
2971                                                 $group = $module->getGroup();
2972                                                 if ( isset( $exemptGroups[$group] ) ) {
2973                                                         $exemptStates[$name] = 'ready';
2974                                                         if ( !$module->isKnownEmpty( $context ) ) {
2975                                                                 // E.g. Don't output empty <styles>
2976                                                                 $exemptGroups[$group][] = $name;
2977                                                         }
2978                                                         return false;
2979                                                 }
2980                                         }
2981                                         return true;
2982                                 }
2983                         );
2984                         $this->rlExemptStyleModules = $exemptGroups;
2985
2986                         $rlClient = new ResourceLoaderClientHtml( $context, [
2987                                 'target' => $this->getTarget(),
2988                                 'nonce' => $this->getCSPNonce(),
2989                                 // When 'safemode', disallowUserJs(), or reduceAllowedModules() is used
2990                                 // to only restrict modules to ORIGIN_CORE (ie. disallow ORIGIN_USER), the list of
2991                                 // modules enqueud for loading on this page is filtered to just those.
2992                                 // However, to make sure we also apply the restriction to dynamic dependencies and
2993                                 // lazy-loaded modules at run-time on the client-side, pass 'safemode' down to the
2994                                 // StartupModule so that the client-side registry will not contain any restricted
2995                                 // modules either. (T152169, T185303)
2996                                 'safemode' => ( $this->getAllowedModules( ResourceLoaderModule::TYPE_COMBINED )
2997                                         <= ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL
2998                                 ) ? '1' : null,
2999                         ] );
3000                         $rlClient->setConfig( $this->getJSVars() );
3001                         $rlClient->setModules( $this->getModules( /*filter*/ true ) );
3002                         $rlClient->setModuleStyles( $moduleStyles );
3003                         $rlClient->setExemptStates( $exemptStates );
3004                         $this->rlClient = $rlClient;
3005                 }
3006                 return $this->rlClient;
3007         }
3008
3009         /**
3010          * @param Skin $sk The given Skin
3011          * @param bool $includeStyle Unused
3012          * @return string The doctype, opening "<html>", and head element.
3013          */
3014         public function headElement( Skin $sk, $includeStyle = true ) {
3015                 $userdir = $this->getLanguage()->getDir();
3016                 $sitedir = MediaWikiServices::getInstance()->getContentLanguage()->getDir();
3017
3018                 $pieces = [];
3019                 $pieces[] = Html::htmlHeader( Sanitizer::mergeAttributes(
3020                         $this->getRlClient()->getDocumentAttributes(),
3021                         $sk->getHtmlElementAttributes()
3022                 ) );
3023                 $pieces[] = Html::openElement( 'head' );
3024
3025                 if ( $this->getHTMLTitle() == '' ) {
3026                         $this->setHTMLTitle( $this->msg( 'pagetitle', $this->getPageTitle() )->inContentLanguage() );
3027                 }
3028
3029                 if ( !Html::isXmlMimeType( $this->getConfig()->get( 'MimeType' ) ) ) {
3030                         // Add <meta charset="UTF-8">
3031                         // This should be before <title> since it defines the charset used by
3032                         // text including the text inside <title>.
3033                         // The spec recommends defining XHTML5's charset using the XML declaration
3034                         // instead of meta.
3035                         // Our XML declaration is output by Html::htmlHeader.
3036                         // https://html.spec.whatwg.org/multipage/semantics.html#attr-meta-http-equiv-content-type
3037                         // https://html.spec.whatwg.org/multipage/semantics.html#charset
3038                         $pieces[] = Html::element( 'meta', [ 'charset' => 'UTF-8' ] );
3039                 }
3040
3041                 $pieces[] = Html::element( 'title', null, $this->getHTMLTitle() );
3042                 $pieces[] = $this->getRlClient()->getHeadHtml();
3043                 $pieces[] = $this->buildExemptModules();
3044                 $pieces = array_merge( $pieces, array_values( $this->getHeadLinksArray() ) );
3045                 $pieces = array_merge( $pieces, array_values( $this->mHeadItems ) );
3046
3047                 // Use an IE conditional comment to serve the script only to old IE
3048                 $pieces[] = '<!--[if lt IE 9]>' .
3049                         ResourceLoaderClientHtml::makeLoad(
3050                                 new ResourceLoaderContext(
3051                                         $this->getResourceLoader(),
3052                                         new FauxRequest( [] )
3053                                 ),
3054                                 [ 'html5shiv' ],
3055                                 ResourceLoaderModule::TYPE_SCRIPTS,
3056                                 [ 'raw' => '1', 'sync' => '1' ],
3057                                 $this->getCSPNonce()
3058                         ) .
3059                         '<![endif]-->';
3060
3061                 $pieces[] = Html::closeElement( 'head' );
3062
3063                 $bodyClasses = $this->mAdditionalBodyClasses;
3064                 $bodyClasses[] = 'mediawiki';
3065
3066                 # Classes for LTR/RTL directionality support
3067                 $bodyClasses[] = $userdir;
3068                 $bodyClasses[] = "sitedir-$sitedir";
3069
3070                 $underline = $this->getUser()->getOption( 'underline' );
3071                 if ( $underline < 2 ) {
3072                         // The following classes can be used here:
3073                         // * mw-underline-always
3074                         // * mw-underline-never
3075                         $bodyClasses[] = 'mw-underline-' . ( $underline ? 'always' : 'never' );
3076                 }
3077
3078                 if ( $this->getLanguage()->capitalizeAllNouns() ) {
3079                         # A <body> class is probably not the best way to do this . . .
3080                         $bodyClasses[] = 'capitalize-all-nouns';
3081                 }
3082
3083                 // Parser feature migration class
3084                 // The idea is that this will eventually be removed, after the wikitext
3085                 // which requires it is cleaned up.
3086                 $bodyClasses[] = 'mw-hide-empty-elt';
3087
3088                 $bodyClasses[] = $sk->getPageClasses( $this->getTitle() );
3089                 $bodyClasses[] = 'skin-' . Sanitizer::escapeClass( $sk->getSkinName() );
3090                 $bodyClasses[] =
3091                         'action-' . Sanitizer::escapeClass( Action::getActionName( $this->getContext() ) );
3092
3093                 $bodyAttrs = [];
3094                 // While the implode() is not strictly needed, it's used for backwards compatibility
3095                 // (this used to be built as a string and hooks likely still expect that).
3096                 $bodyAttrs['class'] = implode( ' ', $bodyClasses );
3097
3098                 // Allow skins and extensions to add body attributes they need
3099                 $sk->addToBodyAttributes( $this, $bodyAttrs );
3100                 Hooks::run( 'OutputPageBodyAttributes', [ $this, $sk, &$bodyAttrs ] );
3101
3102                 $pieces[] = Html::openElement( 'body', $bodyAttrs );
3103
3104                 return self::combineWrappedStrings( $pieces );
3105         }
3106
3107         /**
3108          * Get a ResourceLoader object associated with this OutputPage
3109          *
3110          * @return ResourceLoader
3111          */
3112         public function getResourceLoader() {
3113                 if ( is_null( $this->mResourceLoader ) ) {
3114                         // Lazy-initialise as needed
3115                         $this->mResourceLoader = MediaWikiServices::getInstance()->getResourceLoader();
3116                 }
3117                 return $this->mResourceLoader;
3118         }
3119
3120         /**
3121          * Explicily load or embed modules on a page.
3122          *
3123          * @param array|string $modules One or more module names
3124          * @param string $only ResourceLoaderModule TYPE_ class constant
3125          * @param array $extraQuery [optional] Array with extra query parameters for the request
3126          * @return string|WrappedStringList HTML
3127          */
3128         public function makeResourceLoaderLink( $modules, $only, array $extraQuery = [] ) {
3129                 // Apply 'target' and 'origin' filters
3130                 $modules = $this->filterModules( (array)$modules, null, $only );
3131
3132                 return ResourceLoaderClientHtml::makeLoad(
3133                         $this->getRlClientContext(),
3134                         $modules,
3135                         $only,
3136                         $extraQuery,
3137                         $this->getCSPNonce()
3138                 );
3139         }
3140
3141         /**
3142          * Combine WrappedString chunks and filter out empty ones
3143          *
3144          * @param array $chunks
3145          * @return string|WrappedStringList HTML
3146          */
3147         protected static function combineWrappedStrings( array $chunks ) {
3148                 // Filter out empty values
3149                 $chunks = array_filter( $chunks, 'strlen' );
3150                 return WrappedString::join( "\n", $chunks );
3151         }
3152
3153         /**
3154          * JS stuff to put at the bottom of the `<body>`.
3155          * These are legacy scripts ($this->mScripts), and user JS.
3156          *
3157          * @return string|WrappedStringList HTML
3158          */
3159         public function getBottomScripts() {
3160                 $chunks = [];
3161                 $chunks[] = $this->getRlClient()->getBodyHtml();
3162
3163                 // Legacy non-ResourceLoader scripts
3164                 $chunks[] = $this->mScripts;
3165
3166                 if ( $this->limitReportJSData ) {
3167                         $chunks[] = ResourceLoader::makeInlineScript(
3168                                 ResourceLoader::makeConfigSetScript(
3169                                         [ 'wgPageParseReport' => $this->limitReportJSData ]
3170                                 ),
3171                                 $this->getCSPNonce()
3172                         );
3173                 }
3174
3175                 return self::combineWrappedStrings( $chunks );
3176         }
3177
3178         /**
3179          * Get the javascript config vars to include on this page
3180          *
3181          * @return array Array of javascript config vars
3182          * @since 1.23
3183          */
3184         public function getJsConfigVars() {
3185                 return $this->mJsConfigVars;
3186         }
3187
3188         /**
3189          * Add one or more variables to be set in mw.config in JavaScript
3190          *
3191          * @param string|array $keys Key or array of key/value pairs
3192          * @param mixed|null $value [optional] Value of the configuration variable
3193          */
3194         public function addJsConfigVars( $keys, $value = null ) {
3195                 if ( is_array( $keys ) ) {
3196                         foreach ( $keys as $key => $value ) {
3197                                 $this->mJsConfigVars[$key] = $value;
3198                         }
3199                         return;
3200                 }
3201
3202                 $this->mJsConfigVars[$keys] = $value;
3203         }
3204
3205         /**
3206          * Get an array containing the variables to be set in mw.config in JavaScript.
3207          *
3208          * Do not add things here which can be evaluated in ResourceLoaderStartUpModule
3209          * - in other words, page-independent/site-wide variables (without state).
3210          * You will only be adding bloat to the html page and causing page caches to
3211          * have to be purged on configuration changes.
3212          * @return array
3213          */
3214         public function getJSVars() {
3215                 $curRevisionId = 0;
3216                 $articleId = 0;
3217                 $canonicalSpecialPageName = false; # T23115
3218                 $services = MediaWikiServices::getInstance();
3219
3220                 $title = $this->getTitle();
3221                 $ns = $title->getNamespace();
3222                 $nsInfo = MediaWikiServices::getInstance()->getNamespaceInfo();
3223                 $canonicalNamespace = $nsInfo->exists( $ns )
3224                         ? $nsInfo->getCanonicalName( $ns )
3225                         : $title->getNsText();
3226
3227                 $sk = $this->getSkin();
3228                 // Get the relevant title so that AJAX features can use the correct page name
3229                 // when making API requests from certain special pages (T36972).
3230                 $relevantTitle = $sk->getRelevantTitle();
3231                 $relevantUser = $sk->getRelevantUser();
3232
3233                 if ( $ns == NS_SPECIAL ) {
3234                         list( $canonicalSpecialPageName, /*...*/ ) =
3235                                 $services->getSpecialPageFactory()->
3236                                         resolveAlias( $title->getDBkey() );
3237                 } elseif ( $this->canUseWikiPage() ) {
3238                         $wikiPage = $this->getWikiPage();
3239                         $curRevisionId = $wikiPage->getLatest();
3240                         $articleId = $wikiPage->getId();
3241                 }
3242
3243                 $lang = $title->getPageViewLanguage();
3244
3245                 // Pre-process information
3246                 $separatorTransTable = $lang->separatorTransformTable();
3247                 $separatorTransTable = $separatorTransTable ?: [];
3248                 $compactSeparatorTransTable = [
3249                         implode( "\t", array_keys( $separatorTransTable ) ),
3250                         implode( "\t", $separatorTransTable ),
3251                 ];
3252                 $digitTransTable = $lang->digitTransformTable();
3253                 $digitTransTable = $digitTransTable ?: [];
3254                 $compactDigitTransTable = [
3255                         implode( "\t", array_keys( $digitTransTable ) ),
3256                         implode( "\t", $digitTransTable ),
3257                 ];
3258
3259                 $user = $this->getUser();
3260
3261                 $vars = [
3262                         'wgCanonicalNamespace' => $canonicalNamespace,
3263                         'wgCanonicalSpecialPageName' => $canonicalSpecialPageName,
3264                         'wgNamespaceNumber' => $title->getNamespace(),
3265                         'wgPageName' => $title->getPrefixedDBkey(),
3266                         'wgTitle' => $title->getText(),
3267                         'wgCurRevisionId' => $curRevisionId,
3268                         'wgRevisionId' => (int)$this->getRevisionId(),
3269                         'wgArticleId' => $articleId,
3270                         'wgIsArticle' => $this->isArticle(),
3271                         'wgIsRedirect' => $title->isRedirect(),
3272                         'wgAction' => Action::getActionName( $this->getContext() ),
3273                         'wgUserName' => $user->isAnon() ? null : $user->getName(),
3274                         'wgUserGroups' => $user->getEffectiveGroups(),
3275                         'wgCategories' => $this->getCategories(),
3276                         'wgBreakFrames' => $this->getFrameOptions() == 'DENY',
3277                         'wgPageContentLanguage' => $lang->getCode(),
3278                         'wgPageContentModel' => $title->getContentModel(),
3279                         'wgSeparatorTransformTable' => $compactSeparatorTransTable,
3280                         'wgDigitTransformTable' => $compactDigitTransTable,
3281                         'wgDefaultDateFormat' => $lang->getDefaultDateFormat(),
3282                         'wgMonthNames' => $lang->getMonthNamesArray(),
3283                         'wgMonthNamesShort' => $lang->getMonthAbbreviationsArray(),
3284                         'wgRelevantPageName' => $relevantTitle->getPrefixedDBkey(),
3285                         'wgRelevantArticleId' => $relevantTitle->getArticleID(),
3286                         'wgRequestId' => WebRequest::getRequestId(),
3287                         'wgCSPNonce' => $this->getCSPNonce(),
3288                 ];
3289
3290                 if ( $user->isLoggedIn() ) {
3291                         $vars['wgUserId'] = $user->getId();
3292                         $vars['wgUserEditCount'] = $user->getEditCount();
3293                         $userReg = $user->getRegistration();
3294                         $vars['wgUserRegistration'] = $userReg ? wfTimestamp( TS_UNIX, $userReg ) * 1000 : null;
3295                         // Get the revision ID of the oldest new message on the user's talk
3296                         // page. This can be used for constructing new message alerts on
3297                         // the client side.
3298                         $vars['wgUserNewMsgRevisionId'] = $user->getNewMessageRevisionId();
3299                 }
3300
3301                 $contLang = $services->getContentLanguage();
3302                 if ( $contLang->hasVariants() ) {
3303                         $vars['wgUserVariant'] = $contLang->getPreferredVariant();
3304                 }
3305                 // Same test as SkinTemplate
3306                 $vars['wgIsProbablyEditable'] = $title->quickUserCan( 'edit', $user )
3307                         && ( $title->exists() || $title->quickUserCan( 'create', $user ) );
3308
3309                 $vars['wgRelevantPageIsProbablyEditable'] = $relevantTitle
3310                         && $relevantTitle->quickUserCan( 'edit', $user )
3311                         && ( $relevantTitle->exists() || $relevantTitle->quickUserCan( 'create', $user ) );
3312
3313                 foreach ( $title->getRestrictionTypes() as $type ) {
3314                         // Following keys are set in $vars:
3315                         // wgRestrictionCreate, wgRestrictionEdit, wgRestrictionMove, wgRestrictionUpload
3316                         $vars['wgRestriction' . ucfirst( $type )] = $title->getRestrictions( $type );
3317                 }
3318
3319                 if ( $title->isMainPage() ) {
3320                         $vars['wgIsMainPage'] = true;
3321                 }
3322
3323                 if ( $this->mRedirectedFrom ) {
3324                         $vars['wgRedirectedFrom'] = $this->mRedirectedFrom->getPrefixedDBkey();
3325                 }
3326
3327                 if ( $relevantUser ) {
3328                         $vars['wgRelevantUserName'] = $relevantUser->getName();
3329                 }
3330
3331                 // Allow extensions to add their custom variables to the mw.config map.
3332                 // Use the 'ResourceLoaderGetConfigVars' hook if the variable is not
3333                 // page-dependant but site-wide (without state).
3334                 // Alternatively, you may want to use OutputPage->addJsConfigVars() instead.
3335                 Hooks::run( 'MakeGlobalVariablesScript', [ &$vars, $this ] );
3336
3337                 // Merge in variables from addJsConfigVars last
3338                 return array_merge( $vars, $this->getJsConfigVars() );
3339         }
3340
3341         /**
3342          * To make it harder for someone to slip a user a fake
3343          * JavaScript or CSS preview, a random token
3344          * is associated with the login session. If it's not
3345          * passed back with the preview request, we won't render
3346          * the code.
3347          *
3348          * @return bool
3349          */
3350         public function userCanPreview() {
3351                 $request = $this->getRequest();
3352                 if (
3353                         $request->getVal( 'action' ) !== 'submit' ||
3354                         !$request->wasPosted()
3355                 ) {
3356                         return false;
3357                 }
3358
3359                 $user = $this->getUser();
3360
3361                 if ( !$user->isLoggedIn() ) {
3362                         // Anons have predictable edit tokens
3363                         return false;
3364                 }
3365                 if ( !$user->matchEditToken( $request->getVal( 'wpEditToken' ) ) ) {
3366                         return false;
3367                 }
3368
3369                 $title = $this->getTitle();
3370                 $errors = $title->getUserPermissionsErrors( 'edit', $user );
3371                 if ( count( $errors ) !== 0 ) {
3372                         return false;
3373                 }
3374
3375                 return true;
3376         }
3377
3378         /**
3379          * @return array Array in format "link name or number => 'link html'".
3380          */
3381         public function getHeadLinksArray() {
3382                 global $wgVersion;
3383
3384                 $tags = [];
3385                 $config = $this->getConfig();
3386
3387                 $canonicalUrl = $this->mCanonicalUrl;
3388
3389                 $tags['meta-generator'] = Html::element( 'meta', [
3390                         'name' => 'generator',
3391                         'content' => "MediaWiki $wgVersion",
3392                 ] );
3393
3394                 if ( $config->get( 'ReferrerPolicy' ) !== false ) {
3395                         // Per https://w3c.github.io/webappsec-referrer-policy/#unknown-policy-values
3396                         // fallbacks should come before the primary value so we need to reverse the array.
3397                         foreach ( array_reverse( (array)$config->get( 'ReferrerPolicy' ) ) as $i => $policy ) {
3398                                 $tags["meta-referrer-$i"] = Html::element( 'meta', [
3399                                         'name' => 'referrer',
3400                                         'content' => $policy,
3401                                 ] );
3402                         }
3403                 }
3404
3405                 $p = "{$this->mIndexPolicy},{$this->mFollowPolicy}";
3406                 if ( $p !== 'index,follow' ) {
3407                         // http://www.robotstxt.org/wc/meta-user.html
3408                         // Only show if it's different from the default robots policy
3409                         $tags['meta-robots'] = Html::element( 'meta', [
3410                                 'name' => 'robots',
3411                                 'content' => $p,
3412                         ] );
3413                 }
3414
3415                 foreach ( $this->mMetatags as $tag ) {
3416                         if ( strncasecmp( $tag[0], 'http:', 5 ) === 0 ) {
3417                                 $a = 'http-equiv';
3418                                 $tag[0] = substr( $tag[0], 5 );
3419                         } elseif ( strncasecmp( $tag[0], 'og:', 3 ) === 0 ) {
3420                                 $a = 'property';
3421                         } else {
3422                                 $a = 'name';
3423                         }
3424                         $tagName = "meta-{$tag[0]}";
3425                         if ( isset( $tags[$tagName] ) ) {
3426                                 $tagName .= $tag[1];
3427                         }
3428                         $tags[$tagName] = Html::element( 'meta',
3429                                 [
3430                                         $a => $tag[0],
3431                                         'content' => $tag[1]
3432                                 ]
3433                         );
3434                 }
3435
3436                 foreach ( $this->mLinktags as $tag ) {
3437                         $tags[] = Html::element( 'link', $tag );
3438                 }
3439
3440                 # Universal edit button
3441                 if ( $config->get( 'UniversalEditButton' ) && $this->isArticleRelated() ) {
3442                         $user = $this->getUser();
3443                         if ( $this->getTitle()->quickUserCan( 'edit', $user )
3444                                 && ( $this->getTitle()->exists() ||
3445                                         $this->getTitle()->quickUserCan( 'create', $user ) )
3446                         ) {
3447                                 // Original UniversalEditButton
3448                                 $msg = $this->msg( 'edit' )->text();
3449                                 $tags['universal-edit-button'] = Html::element( 'link', [
3450                                         'rel' => 'alternate',
3451                                         'type' => 'application/x-wiki',
3452                                         'title' => $msg,
3453                                         'href' => $this->getTitle()->getEditURL(),
3454                                 ] );
3455                                 // Alternate edit link
3456                                 $tags['alternative-edit'] = Html::element( 'link', [
3457                                         'rel' => 'edit',
3458                                         'title' => $msg,
3459                                         'href' => $this->getTitle()->getEditURL(),
3460                                 ] );
3461                         }
3462                 }
3463
3464                 # Generally the order of the favicon and apple-touch-icon links
3465                 # should not matter, but Konqueror (3.5.9 at least) incorrectly
3466                 # uses whichever one appears later in the HTML source. Make sure
3467                 # apple-touch-icon is specified first to avoid this.
3468                 if ( $config->get( 'AppleTouchIcon' ) !== false ) {
3469                         $tags['apple-touch-icon'] = Html::element( 'link', [
3470                                 'rel' => 'apple-touch-icon',
3471                                 'href' => $config->get( 'AppleTouchIcon' )
3472                         ] );
3473                 }
3474
3475                 if ( $config->get( 'Favicon' ) !== false ) {
3476                         $tags['favicon'] = Html::element( 'link', [
3477                                 'rel' => 'shortcut icon',
3478                                 'href' => $config->get( 'Favicon' )
3479                         ] );
3480                 }
3481
3482                 # OpenSearch description link
3483                 $tags['opensearch'] = Html::element( 'link', [
3484                         'rel' => 'search',
3485                         'type' => 'application/opensearchdescription+xml',
3486                         'href' => wfScript( 'opensearch_desc' ),
3487                         'title' => $this->msg( 'opensearch-desc' )->inContentLanguage()->text(),
3488                 ] );
3489
3490                 # Real Simple Discovery link, provides auto-discovery information
3491                 # for the MediaWiki API (and potentially additional custom API
3492                 # support such as WordPress or Twitter-compatible APIs for a
3493                 # blogging extension, etc)
3494                 $tags['rsd'] = Html::element( 'link', [
3495                         'rel' => 'EditURI',
3496                         'type' => 'application/rsd+xml',
3497                         // Output a protocol-relative URL here if $wgServer is protocol-relative.
3498                         // Whether RSD accepts relative or protocol-relative URLs is completely
3499                         // undocumented, though.
3500                         'href' => wfExpandUrl( wfAppendQuery(
3501                                 wfScript( 'api' ),
3502                                 [ 'action' => 'rsd' ] ),
3503                                 PROTO_RELATIVE
3504                         ),
3505                 ] );
3506
3507                 # Language variants
3508                 if ( !$config->get( 'DisableLangConversion' ) ) {
3509                         $lang = $this->getTitle()->getPageLanguage();
3510                         if ( $lang->hasVariants() ) {
3511                                 $variants = $lang->getVariants();
3512                                 foreach ( $variants as $variant ) {
3513                                         $tags["variant-$variant"] = Html::element( 'link', [
3514                                                 'rel' => 'alternate',
3515                                                 'hreflang' => LanguageCode::bcp47( $variant ),
3516                                                 'href' => $this->getTitle()->getLocalURL(
3517                                                         [ 'variant' => $variant ] )
3518                                                 ]
3519                                         );
3520                                 }
3521                                 # x-default link per https://support.google.com/webmasters/answer/189077?hl=en
3522                                 $tags["variant-x-default"] = Html::element( 'link', [
3523                                         'rel' => 'alternate',
3524                                         'hreflang' => 'x-default',
3525                                         'href' => $this->getTitle()->getLocalURL() ] );
3526                         }
3527                 }
3528
3529                 # Copyright
3530                 if ( $this->copyrightUrl !== null ) {
3531                         $copyright = $this->copyrightUrl;
3532                 } else {
3533                         $copyright = '';
3534                         if ( $config->get( 'RightsPage' ) ) {
3535                                 $copy = Title::newFromText( $config->get( 'RightsPage' ) );
3536
3537                                 if ( $copy ) {
3538                                         $copyright = $copy->getLocalURL();
3539                                 }
3540                         }
3541
3542                         if ( !$copyright && $config->get( 'RightsUrl' ) ) {
3543                                 $copyright = $config->get( 'RightsUrl' );
3544                         }
3545                 }
3546
3547                 if ( $copyright ) {
3548                         $tags['copyright'] = Html::element( 'link', [
3549                                 'rel' => 'license',
3550                                 'href' => $copyright ]
3551                         );
3552                 }
3553
3554                 # Feeds
3555                 if ( $config->get( 'Feed' ) ) {
3556                         $feedLinks = [];
3557
3558                         foreach ( $this->getSyndicationLinks() as $format => $link ) {
3559                                 # Use the page name for the title.  In principle, this could
3560                                 # lead to issues with having the same name for different feeds
3561                                 # corresponding to the same page, but we can't avoid that at
3562                                 # this low a level.
3563
3564                                 $feedLinks[] = $this->feedLink(
3565                                         $format,
3566                                         $link,
3567                                         # Used messages: 'page-rss-feed' and 'page-atom-feed' (for an easier grep)
3568                                         $this->msg(
3569                                                 "page-{$format}-feed", $this->getTitle()->getPrefixedText()
3570                                         )->text()
3571                                 );
3572                         }
3573
3574                         # Recent changes feed should appear on every page (except recentchanges,
3575                         # that would be redundant). Put it after the per-page feed to avoid
3576                         # changing existing behavior. It's still available, probably via a
3577                         # menu in your browser. Some sites might have a different feed they'd
3578                         # like to promote instead of the RC feed (maybe like a "Recent New Articles"
3579                         # or "Breaking news" one). For this, we see if $wgOverrideSiteFeed is defined.
3580                         # If so, use it instead.
3581                         $sitename = $config->get( 'Sitename' );
3582                         $overrideSiteFeed = $config->get( 'OverrideSiteFeed' );
3583                         if ( $overrideSiteFeed ) {
3584                                 foreach ( $overrideSiteFeed as $type => $feedUrl ) {
3585                                         // Note, this->feedLink escapes the url.
3586                                         $feedLinks[] = $this->feedLink(
3587                                                 $type,
3588                                                 $feedUrl,
3589                                                 $this->msg( "site-{$type}-feed", $sitename )->text()
3590                                         );
3591                                 }
3592                         } elseif ( !$this->getTitle()->isSpecial( 'Recentchanges' ) ) {
3593                                 $rctitle = SpecialPage::getTitleFor( 'Recentchanges' );
3594                                 foreach ( $this->getAdvertisedFeedTypes() as $format ) {
3595                                         $feedLinks[] = $this->feedLink(
3596                                                 $format,
3597                                                 $rctitle->getLocalURL( [ 'feed' => $format ] ),
3598                                                 # For grep: 'site-rss-feed', 'site-atom-feed'
3599                                                 $this->msg( "site-{$format}-feed", $sitename )->text()
3600                                         );
3601                                 }
3602                         }
3603
3604                         # Allow extensions to change the list pf feeds. This hook is primarily for changing,
3605                         # manipulating or removing existing feed tags. If you want to add new feeds, you should
3606                         # use OutputPage::addFeedLink() instead.
3607                         Hooks::run( 'AfterBuildFeedLinks', [ &$feedLinks ] );
3608
3609                         $tags += $feedLinks;
3610                 }
3611
3612                 # Canonical URL
3613                 if ( $config->get( 'EnableCanonicalServerLink' ) ) {
3614                         if ( $canonicalUrl !== false ) {
3615                                 $canonicalUrl = wfExpandUrl( $canonicalUrl, PROTO_CANONICAL );
3616                         } elseif ( $this->isArticleRelated() ) {
3617                                 // This affects all requests where "setArticleRelated" is true. This is
3618                                 // typically all requests that show content (query title, curid, oldid, diff),
3619                                 // and all wikipage actions (edit, delete, purge, info, history etc.).
3620                                 // It does not apply to File pages and Special pages.
3621                                 // 'history' and 'info' actions address page metadata rather than the page
3622                                 // content itself, so they may not be canonicalized to the view page url.
3623                                 // TODO: this ought to be better encapsulated in the Action class.
3624                                 $action = Action::getActionName( $this->getContext() );
3625                                 if ( in_array( $action, [ 'history', 'info' ] ) ) {
3626                                         $query = "action={$action}";
3627                                 } else {
3628                                         $query = '';
3629                                 }
3630                                 $canonicalUrl = $this->getTitle()->getCanonicalURL( $query );
3631                         } else {
3632                                 $reqUrl = $this->getRequest()->getRequestURL();
3633                                 $canonicalUrl = wfExpandUrl( $reqUrl, PROTO_CANONICAL );
3634                         }
3635                 }
3636                 if ( $canonicalUrl !== false ) {
3637                         $tags[] = Html::element( 'link', [
3638                                 'rel' => 'canonical',
3639                                 'href' => $canonicalUrl
3640                         ] );
3641                 }
3642
3643                 // Allow extensions to add, remove and/or otherwise manipulate these links
3644                 // If you want only to *add* <head> links, please use the addHeadItem()
3645                 // (or addHeadItems() for multiple items) method instead.
3646                 // This hook is provided as a last resort for extensions to modify these
3647                 // links before the output is sent to client.
3648                 Hooks::run( 'OutputPageAfterGetHeadLinksArray', [ &$tags, $this ] );
3649
3650                 return $tags;
3651         }
3652
3653         /**
3654          * Generate a "<link rel/>" for a feed.
3655          *
3656          * @param string $type Feed type
3657          * @param string $url URL to the feed
3658          * @param string $text Value of the "title" attribute
3659          * @return string HTML fragment
3660          */
3661         private function feedLink( $type, $url, $text ) {
3662                 return Html::element( 'link', [
3663                         'rel' => 'alternate',
3664                         'type' => "application/$type+xml",
3665                         'title' => $text,
3666                         'href' => $url ]
3667                 );
3668         }
3669
3670         /**
3671          * Add a local or specified stylesheet, with the given media options.
3672          * Internal use only. Use OutputPage::addModuleStyles() if possible.
3673          *
3674          * @param string $style URL to the file
3675          * @param string $media To specify a media type, 'screen', 'printable', 'handheld' or any.
3676          * @param string $condition For IE conditional comments, specifying an IE version
3677          * @param string $dir Set to 'rtl' or 'ltr' for direction-specific sheets
3678          */
3679         public function addStyle( $style, $media = '', $condition = '', $dir = '' ) {
3680                 $options = [];
3681                 if ( $media ) {
3682                         $options['media'] = $media;
3683                 }
3684                 if ( $condition ) {
3685                         $options['condition'] = $condition;
3686                 }
3687                 if ( $dir ) {
3688                         $options['dir'] = $dir;
3689                 }
3690                 $this->styles[$style] = $options;
3691         }
3692
3693         /**
3694          * Adds inline CSS styles
3695          * Internal use only. Use OutputPage::addModuleStyles() if possible.
3696          *
3697          * @param mixed $style_css Inline CSS
3698          * @param string $flip Set to 'flip' to flip the CSS if needed
3699          */
3700         public function addInlineStyle( $style_css, $flip = 'noflip' ) {
3701                 if ( $flip === 'flip' && $this->getLanguage()->isRTL() ) {
3702                         # If wanted, and the interface is right-to-left, flip the CSS
3703                         $style_css = CSSJanus::transform( $style_css, true, false );
3704                 }
3705                 $this->mInlineStyles .= Html::inlineStyle( $style_css );
3706         }
3707
3708         /**
3709          * Build exempt modules and legacy non-ResourceLoader styles.
3710          *
3711          * @return string|WrappedStringList HTML
3712          */
3713         protected function buildExemptModules() {
3714                 $chunks = [];
3715                 // Things that go after the ResourceLoaderDynamicStyles marker
3716                 $append = [];
3717
3718                 // We want site, private and user styles to override dynamically added styles from
3719                 // general modules, but we want dynamically added styles to override statically added
3720                 // style modules. So the order has to be:
3721                 // - page style modules (formatted by ResourceLoaderClientHtml::getHeadHtml())
3722                 // - dynamically loaded styles (added by mw.loader before ResourceLoaderDynamicStyles)
3723                 // - ResourceLoaderDynamicStyles marker
3724                 // - site/private/user styles
3725
3726                 // Add legacy styles added through addStyle()/addInlineStyle() here
3727                 $chunks[] = implode( '', $this->buildCssLinksArray() ) . $this->mInlineStyles;
3728
3729                 $chunks[] = Html::element(
3730                         'meta',
3731                         [ 'name' => 'ResourceLoaderDynamicStyles', 'content' => '' ]
3732                 );
3733
3734                 $separateReq = [ 'site.styles', 'user.styles' ];
3735                 foreach ( $this->rlExemptStyleModules as $group => $moduleNames ) {
3736                         // Combinable modules
3737                         $chunks[] = $this->makeResourceLoaderLink(
3738                                 array_diff( $moduleNames, $separateReq ),
3739                                 ResourceLoaderModule::TYPE_STYLES
3740                         );
3741
3742                         foreach ( array_intersect( $moduleNames, $separateReq ) as $name ) {
3743                                 // These require their own dedicated request in order to support "@import"
3744                                 // syntax, which is incompatible with concatenation. (T147667, T37562)
3745                                 $chunks[] = $this->makeResourceLoaderLink( $name,
3746                                         ResourceLoaderModule::TYPE_STYLES
3747                                 );
3748                         }
3749                 }
3750
3751                 return self::combineWrappedStrings( array_merge( $chunks, $append ) );
3752         }
3753
3754         /**
3755          * @return array
3756          */
3757         public function buildCssLinksArray() {
3758                 $links = [];
3759
3760                 foreach ( $this->styles as $file => $options ) {
3761                         $link = $this->styleLink( $file, $options );
3762                         if ( $link ) {
3763                                 $links[$file] = $link;
3764                         }
3765                 }
3766                 return $links;
3767         }
3768
3769         /**
3770          * Generate \<link\> tags for stylesheets
3771          *
3772          * @param string $style URL to the file
3773          * @param array $options Option, can contain 'condition', 'dir', 'media' keys
3774          * @return string HTML fragment
3775          */
3776         protected function styleLink( $style, array $options ) {
3777                 if ( isset( $options['dir'] ) && $this->getLanguage()->getDir() != $options['dir'] ) {
3778                         return '';
3779                 }
3780
3781                 if ( isset( $options['media'] ) ) {
3782                         $media = self::transformCssMedia( $options['media'] );
3783                         if ( is_null( $media ) ) {
3784                                 return '';
3785                         }
3786                 } else {
3787                         $media = 'all';
3788                 }
3789
3790                 if ( substr( $style, 0, 1 ) == '/' ||
3791                         substr( $style, 0, 5 ) == 'http:' ||
3792                         substr( $style, 0, 6 ) == 'https:' ) {
3793                         $url = $style;
3794                 } else {
3795                         $config = $this->getConfig();
3796                         // Append file hash as query parameter
3797                         $url = self::transformResourcePath(
3798                                 $config,
3799                                 $config->get( 'StylePath' ) . '/' . $style
3800                         );
3801                 }
3802
3803                 $link = Html::linkedStyle( $url, $media );
3804
3805                 if ( isset( $options['condition'] ) ) {
3806                         $condition = htmlspecialchars( $options['condition'] );
3807                         $link = "<!--[if $condition]>$link<![endif]-->";
3808                 }
3809                 return $link;
3810         }
3811
3812         /**
3813          * Transform path to web-accessible static resource.
3814          *
3815          * This is used to add a validation hash as query string.
3816          * This aids various behaviors:
3817          *
3818          * - Put long Cache-Control max-age headers on responses for improved
3819          *   cache performance.
3820          * - Get the correct version of a file as expected by the current page.
3821          * - Instantly get the updated version of a file after deployment.
3822          *
3823          * Avoid using this for urls included in HTML as otherwise clients may get different
3824          * versions of a resource when navigating the site depending on when the page was cached.
3825          * If changes to the url propagate, this is not a problem (e.g. if the url is in
3826          * an external stylesheet).
3827          *
3828          * @since 1.27
3829          * @param Config $config
3830          * @param string $path Path-absolute URL to file (from document root, must start with "/")
3831          * @return string URL
3832          */
3833         public static function transformResourcePath( Config $config, $path ) {
3834                 global $IP;
3835
3836                 $localDir = $IP;
3837                 $remotePathPrefix = $config->get( 'ResourceBasePath' );
3838                 if ( $remotePathPrefix === '' ) {
3839                         // The configured base path is required to be empty string for
3840                         // wikis in the domain root
3841                         $remotePath = '/';
3842                 } else {
3843                         $remotePath = $remotePathPrefix;
3844                 }
3845                 if ( strpos( $path, $remotePath ) !== 0 || substr( $path, 0, 2 ) === '//' ) {
3846                         // - Path is outside wgResourceBasePath, ignore.
3847                         // - Path is protocol-relative. Fixes T155310. Not supported by RelPath lib.
3848                         return $path;
3849                 }
3850                 // For files in resources, extensions/ or skins/, ResourceBasePath is preferred here.
3851                 // For other misc files in $IP, we'll fallback to that as well. There is, however, a fourth
3852                 // supported dir/path pair in the configuration (wgUploadDirectory, wgUploadPath)
3853                 // which is not expected to be in wgResourceBasePath on CDNs. (T155146)
3854                 $uploadPath = $config->get( 'UploadPath' );
3855                 if ( strpos( $path, $uploadPath ) === 0 ) {
3856                         $localDir = $config->get( 'UploadDirectory' );
3857                         $remotePathPrefix = $remotePath = $uploadPath;
3858                 }
3859
3860                 $path = RelPath::getRelativePath( $path, $remotePath );
3861                 return self::transformFilePath( $remotePathPrefix, $localDir, $path );
3862         }
3863
3864         /**
3865          * Utility method for transformResourceFilePath().
3866          *
3867          * Caller is responsible for ensuring the file exists. Emits a PHP warning otherwise.
3868          *
3869          * @since 1.27
3870          * @param string $remotePathPrefix URL path prefix that points to $localPath
3871          * @param string $localPath File directory exposed at $remotePath
3872          * @param string $file Path to target file relative to $localPath
3873          * @return string URL
3874          */
3875         public static function transformFilePath( $remotePathPrefix, $localPath, $file ) {
3876                 $hash = md5_file( "$localPath/$file" );
3877                 if ( $hash === false ) {
3878                         wfLogWarning( __METHOD__ . ": Failed to hash $localPath/$file" );
3879                         $hash = '';
3880                 }
3881                 return "$remotePathPrefix/$file?" . substr( $hash, 0, 5 );
3882         }
3883
3884         /**
3885          * Transform "media" attribute based on request parameters
3886          *
3887          * @param string $media Current value of the "media" attribute
3888          * @return string Modified value of the "media" attribute, or null to skip
3889          * this stylesheet
3890          */
3891         public static function transformCssMedia( $media ) {
3892                 global $wgRequest;
3893
3894                 // https://www.w3.org/TR/css3-mediaqueries/#syntax
3895                 $screenMediaQueryRegex = '/^(?:only\s+)?screen\b/i';
3896
3897                 // Switch in on-screen display for media testing
3898                 $switches = [
3899                         'printable' => 'print',
3900                         'handheld' => 'handheld',
3901                 ];
3902                 foreach ( $switches as $switch => $targetMedia ) {
3903                         if ( $wgRequest->getBool( $switch ) ) {
3904                                 if ( $media == $targetMedia ) {
3905                                         $media = '';
3906                                 } elseif ( preg_match( $screenMediaQueryRegex, $media ) === 1 ) {
3907                                         /* This regex will not attempt to understand a comma-separated media_query_list
3908                                          *
3909                                          * Example supported values for $media:
3910                                          * 'screen', 'only screen', 'screen and (min-width: 982px)' ),
3911                                          * Example NOT supported value for $media:
3912                                          * '3d-glasses, screen, print and resolution > 90dpi'
3913                                          *
3914                                          * If it's a print request, we never want any kind of screen stylesheets
3915                                          * If it's a handheld request (currently the only other choice with a switch),
3916                                          * we don't want simple 'screen' but we might want screen queries that
3917                                          * have a max-width or something, so we'll pass all others on and let the
3918                                          * client do the query.
3919                                          */
3920                                         if ( $targetMedia == 'print' || $media == 'screen' ) {
3921                                                 return null;
3922                                         }
3923                                 }
3924                         }
3925                 }
3926
3927                 return $media;
3928         }
3929
3930         /**
3931          * Add a wikitext-formatted message to the output.
3932          * This is equivalent to:
3933          *
3934          *    $wgOut->addWikiText( wfMessage( ... )->plain() )
3935          */
3936         public function addWikiMsg( /*...*/ ) {
3937                 $args = func_get_args();
3938                 $name = array_shift( $args );
3939                 $this->addWikiMsgArray( $name, $args );
3940         }
3941
3942         /**
3943          * Add a wikitext-formatted message to the output.
3944          * Like addWikiMsg() except the parameters are taken as an array
3945          * instead of a variable argument list.
3946          *
3947          * @param string $name
3948          * @param array $args
3949          */
3950         public function addWikiMsgArray( $name, $args ) {
3951                 $this->addHTML( $this->msg( $name, $args )->parseAsBlock() );
3952         }
3953
3954         /**
3955          * This function takes a number of message/argument specifications, wraps them in
3956          * some overall structure, and then parses the result and adds it to the output.
3957          *
3958          * In the $wrap, $1 is replaced with the first message, $2 with the second,
3959          * and so on. The subsequent arguments may be either
3960          * 1) strings, in which case they are message names, or
3961          * 2) arrays, in which case, within each array, the first element is the message
3962          *    name, and subsequent elements are the parameters to that message.
3963          *
3964          * Don't use this for messages that are not in the user's interface language.
3965          *
3966          * For example:
3967          *
3968          *     $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>", 'some-error' );
3969          *
3970          * Is equivalent to:
3971          *
3972          *     $wgOut->addWikiTextAsInterface( "<div class='error'>\n"
3973          *         . wfMessage( 'some-error' )->plain() . "\n</div>" );
3974          *
3975          * The newline after the opening div is needed in some wikitext. See T21226.
3976          *
3977          * @param string $wrap
3978          */
3979         public function wrapWikiMsg( $wrap /*, ...*/ ) {
3980                 $msgSpecs = func_get_args();
3981                 array_shift( $msgSpecs );
3982                 $msgSpecs = array_values( $msgSpecs );
3983                 $s = $wrap;
3984                 foreach ( $msgSpecs as $n => $spec ) {
3985                         if ( is_array( $spec ) ) {
3986                                 $args = $spec;
3987                                 $name = array_shift( $args );
3988                         } else {
3989                                 $args = [];
3990                                 $name = $spec;
3991                         }
3992                         $s = str_replace( '$' . ( $n + 1 ), $this->msg( $name, $args )->plain(), $s );
3993                 }
3994                 $this->addWikiTextAsInterface( $s );
3995         }
3996
3997         /**
3998          * Whether the output has a table of contents
3999          * @return bool
4000          * @since 1.22
4001          */
4002         public function isTOCEnabled() {
4003                 return $this->mEnableTOC;
4004         }
4005
4006         /**
4007          * Helper function to setup the PHP implementation of OOUI to use in this request.
4008          *
4009          * @since 1.26
4010          * @param string $skinName The Skin name to determine the correct OOUI theme
4011          * @param string $dir Language direction
4012          */
4013         public static function setupOOUI( $skinName = 'default', $dir = 'ltr' ) {
4014                 $themes = ResourceLoaderOOUIModule::getSkinThemeMap();
4015                 $theme = $themes[$skinName] ?? $themes['default'];
4016                 // For example, 'OOUI\WikimediaUITheme'.
4017                 $themeClass = "OOUI\\{$theme}Theme";
4018                 OOUI\Theme::setSingleton( new $themeClass() );
4019                 OOUI\Element::setDefaultDir( $dir );
4020         }
4021
4022         /**
4023          * Add ResourceLoader module styles for OOUI and set up the PHP implementation of it for use with
4024          * MediaWiki and this OutputPage instance.
4025          *
4026          * @since 1.25
4027          */
4028         public function enableOOUI() {
4029                 self::setupOOUI(
4030                         strtolower( $this->getSkin()->getSkinName() ),
4031                         $this->getLanguage()->getDir()
4032                 );
4033                 $this->addModuleStyles( [
4034                         'oojs-ui-core.styles',
4035                         'oojs-ui.styles.indicators',
4036                         'oojs-ui.styles.textures',
4037                         'mediawiki.widgets.styles',
4038                         'oojs-ui-core.icons',
4039                 ] );
4040         }
4041
4042         /**
4043          * Get (and set if not yet set) the CSP nonce.
4044          *
4045          * This value needs to be included in any <script> tags on the
4046          * page.
4047          *
4048          * @return string|bool Nonce or false to mean don't output nonce
4049          * @since 1.32
4050          */
4051         public function getCSPNonce() {
4052                 if ( !ContentSecurityPolicy::isNonceRequired( $this->getConfig() ) ) {
4053                         return false;
4054                 }
4055                 if ( $this->CSPNonce === null ) {
4056                         // XXX It might be expensive to generate randomness
4057                         // on every request, on Windows.
4058                         $rand = random_bytes( 15 );
4059                         $this->CSPNonce = base64_encode( $rand );
4060                 }
4061                 return $this->CSPNonce;
4062         }
4063
4064 }