includes/OutputPage.php

   1 <?php
   2 /**
   3  * Preparation for the final page rendering.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 use MediaWiki\Linker\LinkTarget;
  24 use MediaWiki\Logger\LoggerFactory;
  25 use MediaWiki\MediaWikiServices;
  26 use MediaWiki\Session\SessionManager;
  27 use Wikimedia\Rdbms\IResultWrapper;
  28 use Wikimedia\RelPath;
  29 use Wikimedia\WrappedString;
  30 use Wikimedia\WrappedStringList;
  31
  32 /**
  33  * This class should be covered by a general architecture document which does
  34  * not exist as of January 2011.  This is one of the Core classes and should
  35  * be read at least once by any new developers.
  36  *
  37  * This class is used to prepare the final rendering. A skin is then
  38  * applied to the output parameters (links, javascript, html, categories ...).
  39  *
  40  * @todo FIXME: Another class handles sending the whole page to the client.
  41  *
  42  * Some comments comes from a pairing session between Zak Greant and Antoine Musso
  43  * in November 2010.
  44  *
  45  * @todo document
  46  */
  47 class OutputPage extends ContextSource {
  48         /** @var array Should be private. Used with addMeta() which adds "<meta>" */
  49         protected $mMetatags = [];
  50
  51         /** @var array */
  52         protected $mLinktags = [];
  53
  54         /** @var bool */
  55         protected $mCanonicalUrl = false;
  56
  57         /**
  58          * @var string The contents of <h1> */
  59         private $mPageTitle = '';
  60
  61         /**
  62          * @var string The displayed title of the page. Different from page title
  63          * if overridden by display title magic word or hooks. Can contain safe
  64          * HTML. Different from page title which may contain messages such as
  65          * "Editing X" which is displayed in h1. This can be used for other places
  66          * where the page name is referred on the page.
  67          */
  68         private $displayTitle;
  69
  70         /**
  71          * @var string Contains all of the "<body>" content. Should be private we
  72          *   got set/get accessors and the append() method.
  73          */
  74         public $mBodytext = '';
  75
  76         /** @var string Stores contents of "<title>" tag */
  77         private $mHTMLtitle = '';
  78
  79         /**
  80          * @var bool Is the displayed content related to the source of the
  81          *   corresponding wiki article.
  82          */
  83         private $mIsArticle = false;
  84
  85         /** @var bool Stores "article flag" toggle. */
  86         private $mIsArticleRelated = true;
  87
  88         /** @var bool Is the content subject to copyright */
  89         private $mHasCopyright = false;
  90
  91         /**
  92          * @var bool We have to set isPrintable(). Some pages should
  93          * never be printed (ex: redirections).
  94          */
  95         private $mPrintable = false;
  96
  97         /**
  98          * @var array Contains the page subtitle. Special pages usually have some
  99          *   links here. Don't confuse with site subtitle added by skins.
 100          */
 101         private $mSubtitle = [];
 102
 103         /** @var string */
 104         public $mRedirect = '';
 105
 106         /** @var int */
 107         protected $mStatusCode;
 108
 109         /**
 110          * @var string Used for sending cache control.
 111          *   The whole caching system should probably be moved into its own class.
 112          */
 113         protected $mLastModified = '';
 114
 115         /** @var array */
 116         protected $mCategoryLinks = [];
 117
 118         /** @var array */
 119         protected $mCategories = [
 120                 'hidden' => [],
 121                 'normal' => [],
 122         ];
 123
 124         /** @var array */
 125         protected $mIndicators = [];
 126
 127         /** @var array Array of Interwiki Prefixed (non DB key) Titles (e.g. 'fr:Test page') */
 128         private $mLanguageLinks = [];
 129
 130         /**
 131          * Used for JavaScript (predates ResourceLoader)
 132          * @todo We should split JS / CSS.
 133          * mScripts content is inserted as is in "<head>" by Skin. This might
 134          * contain either a link to a stylesheet or inline CSS.
 135          */
 136         private $mScripts = '';
 137
 138         /** @var string Inline CSS styles. Use addInlineStyle() sparingly */
 139         protected $mInlineStyles = '';
 140
 141         /**
 142          * @var string Used by skin template.
 143          * Example: $tpl->set( 'displaytitle', $out->mPageLinkTitle );
 144          */
 145         public $mPageLinkTitle = '';
 146
 147         /** @var array Array of elements in "<head>". Parser might add its own headers! */
 148         protected $mHeadItems = [];
 149
 150         /** @var array Additional <body> classes; there are also <body> classes from other sources */
 151         protected $mAdditionalBodyClasses = [];
 152
 153         /** @var array */
 154         protected $mModules = [];
 155
 156         /** @var array */
 157         protected $mModuleScripts = [];
 158
 159         /** @var array */
 160         protected $mModuleStyles = [];
 161
 162         /** @var ResourceLoader */
 163         protected $mResourceLoader;
 164
 165         /** @var ResourceLoaderClientHtml */
 166         private $rlClient;
 167
 168         /** @var ResourceLoaderContext */
 169         private $rlClientContext;
 170
 171         /** @var array */
 172         private $rlExemptStyleModules;
 173
 174         /** @var array */
 175         protected $mJsConfigVars = [];
 176
 177         /** @var array */
 178         protected $mTemplateIds = [];
 179
 180         /** @var array */
 181         protected $mImageTimeKeys = [];
 182
 183         /** @var string */
 184         public $mRedirectCode = '';
 185
 186         protected $mFeedLinksAppendQuery = null;
 187
 188         /** @var array
 189          * What level of 'untrustworthiness' is allowed in CSS/JS modules loaded on this page?
 190          * @see ResourceLoaderModule::$origin
 191          * ResourceLoaderModule::ORIGIN_ALL is assumed unless overridden;
 192          */
 193         protected $mAllowedModules = [
 194                 ResourceLoaderModule::TYPE_COMBINED => ResourceLoaderModule::ORIGIN_ALL,
 195         ];
 196
 197         /** @var bool Whether output is disabled.  If this is true, the 'output' method will do nothing. */
 198         protected $mDoNothing = false;
 199
 200         // Parser related.
 201
 202         /** @var int */
 203         protected $mContainsNewMagic = 0;
 204
 205         /**
 206          * lazy initialised, use parserOptions()
 207          * @var ParserOptions
 208          */
 209         protected $mParserOptions = null;
 210
 211         /**
 212          * Handles the Atom / RSS links.
 213          * We probably only support Atom in 2011.
 214          * @see $wgAdvertisedFeedTypes
 215          */
 216         private $mFeedLinks = [];
 217
 218         // Gwicke work on squid caching? Roughly from 2003.
 219         protected $mEnableClientCache = true;
 220
 221         /** @var bool Flag if output should only contain the body of the article. */
 222         private $mArticleBodyOnly = false;
 223
 224         /** @var bool */
 225         protected $mNewSectionLink = false;
 226
 227         /** @var bool */
 228         protected $mHideNewSectionLink = false;
 229
 230         /**
 231          * @var bool Comes from the parser. This was probably made to load CSS/JS
 232          * only if we had "<gallery>". Used directly in CategoryPage.php.
 233          * Looks like ResourceLoader can replace this.
 234          */
 235         public $mNoGallery = false;
 236
 237         /** @var int Cache stuff. Looks like mEnableClientCache */
 238         protected $mCdnMaxage = 0;
 239         /** @var int Upper limit on mCdnMaxage */
 240         protected $mCdnMaxageLimit = INF;
 241
 242         /**
 243          * @var bool Controls if anti-clickjacking / frame-breaking headers will
 244          * be sent. This should be done for pages where edit actions are possible.
 245          * Setters: $this->preventClickjacking() and $this->allowClickjacking().
 246          */
 247         protected $mPreventClickjacking = true;
 248
 249         /** @var int To include the variable {{REVISIONID}} */
 250         private $mRevisionId = null;
 251
 252         /** @var string */
 253         private $mRevisionTimestamp = null;
 254
 255         /** @var array */
 256         protected $mFileVersion = null;
 257
 258         /**
 259          * @var array An array of stylesheet filenames (relative from skins path),
 260          * with options for CSS media, IE conditions, and RTL/LTR direction.
 261          * For internal use; add settings in the skin via $this->addStyle()
 262          *
 263          * Style again! This seems like a code duplication since we already have
 264          * mStyles. This is what makes Open Source amazing.
 265          */
 266         protected $styles = [];
 267
 268         private $mIndexPolicy = 'index';
 269         private $mFollowPolicy = 'follow';
 270
 271         /**
 272          * @var array Headers that cause the cache to vary.  Key is header name, value is an array of
 273          * options for the Key header.
 274          */
 275         private $mVaryHeader = [
 276                 'Accept-Encoding' => [ 'match=gzip' ],
 277         ];
 278
 279         /**
 280          * If the current page was reached through a redirect, $mRedirectedFrom contains the Title
 281          * of the redirect.
 282          *
 283          * @var Title
 284          */
 285         private $mRedirectedFrom = null;
 286
 287         /**
 288          * Additional key => value data
 289          */
 290         private $mProperties = [];
 291
 292         /**
 293          * @var string|null ResourceLoader target for load.php links. If null, will be omitted
 294          */
 295         private $mTarget = null;
 296
 297         /**
 298          * @var bool Whether parser output contains a table of contents
 299          */
 300         private $mEnableTOC = false;
 301
 302         /**
 303          * @var string|null The URL to send in a <link> element with rel=license
 304          */
 305         private $copyrightUrl;
 306
 307         /** @var array Profiling data */
 308         private $limitReportJSData = [];
 309
 310         /** @var array Map Title to Content */
 311         private $contentOverrides = [];
 312
 313         /** @var callable[] */
 314         private $contentOverrideCallbacks = [];
 315
 316         /**
 317          * Link: header contents
 318          */
 319         private $mLinkHeader = [];
 320
 321         /**
 322          * @var string The nonce for Content-Security-Policy
 323          */
 324         private $CSPNonce;
 325
 326         /**
 327          * @var array A cache of the names of the cookies that will influence the cache
 328          */
 329         private static $cacheVaryCookies = null;
 330
 331         /**
 332          * Constructor for OutputPage. This should not be called directly.
 333          * Instead a new RequestContext should be created and it will implicitly create
 334          * a OutputPage tied to that context.
 335          * @param IContextSource $context
 336          */
 337         function __construct( IContextSource $context ) {
 338                 $this->setContext( $context );
 339         }
 340
 341         /**
 342          * Redirect to $url rather than displaying the normal page
 343          *
 344          * @param string $url
 345          * @param string $responsecode HTTP status code
 346          */
 347         public function redirect( $url, $responsecode = '302' ) {
 348                 # Strip newlines as a paranoia check for header injection in PHP<5.1.2
 349                 $this->mRedirect = str_replace( "\n", '', $url );
 350                 $this->mRedirectCode = $responsecode;
 351         }
 352
 353         /**
 354          * Get the URL to redirect to, or an empty string if not redirect URL set
 355          *
 356          * @return string
 357          */
 358         public function getRedirect() {
 359                 return $this->mRedirect;
 360         }
 361
 362         /**
 363          * Set the copyright URL to send with the output.
 364          * Empty string to omit, null to reset.
 365          *
 366          * @since 1.26
 367          *
 368          * @param string|null $url
 369          */
 370         public function setCopyrightUrl( $url ) {
 371                 $this->copyrightUrl = $url;
 372         }
 373
 374         /**
 375          * Set the HTTP status code to send with the output.
 376          *
 377          * @param int $statusCode
 378          */
 379         public function setStatusCode( $statusCode ) {
 380                 $this->mStatusCode = $statusCode;
 381         }
 382
 383         /**
 384          * Add a new "<meta>" tag
 385          * To add an http-equiv meta tag, precede the name with "http:"
 386          *
 387          * @param string $name Name of the meta tag
 388          * @param string $val Value of the meta tag
 389          */
 390         function addMeta( $name, $val ) {
 391                 array_push( $this->mMetatags, [ $name, $val ] );
 392         }
 393
 394         /**
 395          * Returns the current <meta> tags
 396          *
 397          * @since 1.25
 398          * @return array
 399          */
 400         public function getMetaTags() {
 401                 return $this->mMetatags;
 402         }
 403
 404         /**
 405          * Add a new \<link\> tag to the page header.
 406          *
 407          * Note: use setCanonicalUrl() for rel=canonical.
 408          *
 409          * @param array $linkarr Associative array of attributes.
 410          */
 411         function addLink( array $linkarr ) {
 412                 array_push( $this->mLinktags, $linkarr );
 413         }
 414
 415         /**
 416          * Returns the current <link> tags
 417          *
 418          * @since 1.25
 419          * @return array
 420          */
 421         public function getLinkTags() {
 422                 return $this->mLinktags;
 423         }
 424
 425         /**
 426          * Set the URL to be used for the <link rel=canonical>. This should be used
 427          * in preference to addLink(), to avoid duplicate link tags.
 428          * @param string $url
 429          */
 430         function setCanonicalUrl( $url ) {
 431                 $this->mCanonicalUrl = $url;
 432         }
 433
 434         /**
 435          * Returns the URL to be used for the <link rel=canonical> if
 436          * one is set.
 437          *
 438          * @since 1.25
 439          * @return bool|string
 440          */
 441         public function getCanonicalUrl() {
 442                 return $this->mCanonicalUrl;
 443         }
 444
 445         /**
 446          * Add raw HTML to the list of scripts (including \<script\> tag, etc.)
 447          * Internal use only. Use OutputPage::addModules() or OutputPage::addJsConfigVars()
 448          * if possible.
 449          *
 450          * @param string $script Raw HTML
 451          */
 452         function addScript( $script ) {
 453                 $this->mScripts .= $script;
 454         }
 455
 456         /**
 457          * Add a JavaScript file to be loaded as `<script>` on this page.
 458          *
 459          * Internal use only. Use OutputPage::addModules() if possible.
 460          *
 461          * @param string $file URL to file (absolute path, protocol-relative, or full url)
 462          * @param string|null $unused Previously used to change the cache-busting query parameter
 463          */
 464         public function addScriptFile( $file, $unused = null ) {
 465                 if ( substr( $file, 0, 1 ) !== '/' && !preg_match( '#^[a-z]*://#i', $file ) ) {
 466                         // This is not an absolute path, protocol-relative url, or full scheme url,
 467                         // presumed to be an old call intended to include a file from /w/skins/common,
 468                         // which doesn't exist anymore as of MediaWiki 1.24 per T71277. Ignore.
 469                         wfDeprecated( __METHOD__, '1.24' );
 470                         return;
 471                 }
 472                 $this->addScript( Html::linkedScript( $file, $this->getCSPNonce() ) );
 473         }
 474
 475         /**
 476          * Add a self-contained script tag with the given contents
 477          * Internal use only. Use OutputPage::addModules() if possible.
 478          *
 479          * @param string $script JavaScript text, no script tags
 480          */
 481         public function addInlineScript( $script ) {
 482                 $this->mScripts .= Html::inlineScript( "\n$script\n", $this->getCSPNonce() ) . "\n";
 483         }
 484
 485         /**
 486          * Filter an array of modules to remove insufficiently trustworthy members, and modules
 487          * which are no longer registered (eg a page is cached before an extension is disabled)
 488          * @param array $modules
 489          * @param string|null $position Unused
 490          * @param string $type
 491          * @return array
 492          */
 493         protected function filterModules( array $modules, $position = null,
 494                 $type = ResourceLoaderModule::TYPE_COMBINED
 495         ) {
 496                 $resourceLoader = $this->getResourceLoader();
 497                 $filteredModules = [];
 498                 foreach ( $modules as $val ) {
 499                         $module = $resourceLoader->getModule( $val );
 500                         if ( $module instanceof ResourceLoaderModule
 501                                 && $module->getOrigin() <= $this->getAllowedModules( $type )
 502                         ) {
 503                                 if ( $this->mTarget && !in_array( $this->mTarget, $module->getTargets() ) ) {
 504                                         $this->warnModuleTargetFilter( $module->getName() );
 505                                         continue;
 506                                 }
 507                                 $filteredModules[] = $val;
 508                         }
 509                 }
 510                 return $filteredModules;
 511         }
 512
 513         private function warnModuleTargetFilter( $moduleName ) {
 514                 static $warnings = [];
 515                 if ( isset( $warnings[$this->mTarget][$moduleName] ) ) {
 516                         return;
 517                 }
 518                 $warnings[$this->mTarget][$moduleName] = true;
 519                 $this->getResourceLoader()->getLogger()->debug(
 520                         'Module "{module}" not loadable on target "{target}".',
 521                         [
 522                                 'module' => $moduleName,
 523                                 'target' => $this->mTarget,
 524                         ]
 525                 );
 526         }
 527
 528         /**
 529          * Get the list of modules to include on this page
 530          *
 531          * @param bool $filter Whether to filter out insufficiently trustworthy modules
 532          * @param string|null $position Unused
 533          * @param string $param
 534          * @param string $type
 535          * @return array Array of module names
 536          */
 537         public function getModules( $filter = false, $position = null, $param = 'mModules',
 538                 $type = ResourceLoaderModule::TYPE_COMBINED
 539         ) {
 540                 $modules = array_values( array_unique( $this->$param ) );
 541                 return $filter
 542                         ? $this->filterModules( $modules, null, $type )
 543                         : $modules;
 544         }
 545
 546         /**
 547          * Load one or more ResourceLoader modules on this page.
 548          *
 549          * @param string|array $modules Module name (string) or array of module names
 550          */
 551         public function addModules( $modules ) {
 552                 $this->mModules = array_merge( $this->mModules, (array)$modules );
 553         }
 554
 555         /**
 556          * Get the list of script-only modules to load on this page.
 557          *
 558          * @param bool $filter
 559          * @param string|null $position Unused
 560          * @return array Array of module names
 561          */
 562         public function getModuleScripts( $filter = false, $position = null ) {
 563                 return $this->getModules( $filter, null, 'mModuleScripts',
 564                         ResourceLoaderModule::TYPE_SCRIPTS
 565                 );
 566         }
 567
 568         /**
 569          * Load the scripts of one or more ResourceLoader modules, on this page.
 570          *
 571          * This method exists purely to provide the legacy behaviour of loading
 572          * a module's scripts in the global scope, and without dependency resolution.
 573          * See <https://phabricator.wikimedia.org/T188689>.
 574          *
 575          * @deprecated since 1.31 Use addModules() instead.
 576          * @param string|array $modules Module name (string) or array of module names
 577          */
 578         public function addModuleScripts( $modules ) {
 579                 $this->mModuleScripts = array_merge( $this->mModuleScripts, (array)$modules );
 580         }
 581
 582         /**
 583          * Get the list of style-only modules to load on this page.
 584          *
 585          * @param bool $filter
 586          * @param string|null $position Unused
 587          * @return array Array of module names
 588          */
 589         public function getModuleStyles( $filter = false, $position = null ) {
 590                 return $this->getModules( $filter, null, 'mModuleStyles',
 591                         ResourceLoaderModule::TYPE_STYLES
 592                 );
 593         }
 594
 595         /**
 596          * Load the styles of one or more ResourceLoader modules on this page.
 597          *
 598          * Module styles added through this function will be loaded as a stylesheet,
 599          * using a standard `<link rel=stylesheet>` HTML tag, rather than as a combined
 600          * Javascript and CSS package. Thus, they will even load when JavaScript is disabled.
 601          *
 602          * @param string|array $modules Module name (string) or array of module names
 603          */
 604         public function addModuleStyles( $modules ) {
 605                 $this->mModuleStyles = array_merge( $this->mModuleStyles, (array)$modules );
 606         }
 607
 608         /**
 609          * @return null|string ResourceLoader target
 610          */
 611         public function getTarget() {
 612                 return $this->mTarget;
 613         }
 614
 615         /**
 616          * Sets ResourceLoader target for load.php links. If null, will be omitted
 617          *
 618          * @param string|null $target
 619          */
 620         public function setTarget( $target ) {
 621                 $this->mTarget = $target;
 622         }
 623
 624         /**
 625          * Add a mapping from a LinkTarget to a Content, for things like page preview.
 626          * @see self::addContentOverrideCallback()
 627          * @since 1.32
 628          * @param LinkTarget $target
 629          * @param Content $content
 630          */
 631         public function addContentOverride( LinkTarget $target, Content $content ) {
 632                 if ( !$this->contentOverrides ) {
 633                         // Register a callback for $this->contentOverrides on the first call
 634                         $this->addContentOverrideCallback( function ( LinkTarget $target ) {
 635                                 $key = $target->getNamespace() . ':' . $target->getDBkey();
 636                                 return $this->contentOverrides[$key] ?? null;
 637                         } );
 638                 }
 639
 640                 $key = $target->getNamespace() . ':' . $target->getDBkey();
 641                 $this->contentOverrides[$key] = $content;
 642         }
 643
 644         /**
 645          * Add a callback for mapping from a Title to a Content object, for things
 646          * like page preview.
 647          * @see ResourceLoaderContext::getContentOverrideCallback()
 648          * @since 1.32
 649          * @param callable $callback
 650          */
 651         public function addContentOverrideCallback( callable $callback ) {
 652                 $this->contentOverrideCallbacks[] = $callback;
 653         }
 654
 655         /**
 656          * Get an array of head items
 657          *
 658          * @return array
 659          */
 660         function getHeadItemsArray() {
 661                 return $this->mHeadItems;
 662         }
 663
 664         /**
 665          * Add or replace a head item to the output
 666          *
 667          * Whenever possible, use more specific options like ResourceLoader modules,
 668          * OutputPage::addLink(), OutputPage::addMetaLink() and OutputPage::addFeedLink()
 669          * Fallback options for those are: OutputPage::addStyle, OutputPage::addScript(),
 670          * OutputPage::addInlineScript() and OutputPage::addInlineStyle()
 671          * This would be your very LAST fallback.
 672          *
 673          * @param string $name Item name
 674          * @param string $value Raw HTML
 675          */
 676         public function addHeadItem( $name, $value ) {
 677                 $this->mHeadItems[$name] = $value;
 678         }
 679
 680         /**
 681          * Add one or more head items to the output
 682          *
 683          * @since 1.28
 684          * @param string|string[] $values Raw HTML
 685          */
 686         public function addHeadItems( $values ) {
 687                 $this->mHeadItems = array_merge( $this->mHeadItems, (array)$values );
 688         }
 689
 690         /**
 691          * Check if the header item $name is already set
 692          *
 693          * @param string $name Item name
 694          * @return bool
 695          */
 696         public function hasHeadItem( $name ) {
 697                 return isset( $this->mHeadItems[$name] );
 698         }
 699
 700         /**
 701          * Add a class to the <body> element
 702          *
 703          * @since 1.30
 704          * @param string|string[] $classes One or more classes to add
 705          */
 706         public function addBodyClasses( $classes ) {
 707                 $this->mAdditionalBodyClasses = array_merge( $this->mAdditionalBodyClasses, (array)$classes );
 708         }
 709
 710         /**
 711          * Set whether the output should only contain the body of the article,
 712          * without any skin, sidebar, etc.
 713          * Used e.g. when calling with "action=render".
 714          *
 715          * @param bool $only Whether to output only the body of the article
 716          */
 717         public function setArticleBodyOnly( $only ) {
 718                 $this->mArticleBodyOnly = $only;
 719         }
 720
 721         /**
 722          * Return whether the output will contain only the body of the article
 723          *
 724          * @return bool
 725          */
 726         public function getArticleBodyOnly() {
 727                 return $this->mArticleBodyOnly;
 728         }
 729
 730         /**
 731          * Set an additional output property
 732          * @since 1.21
 733          *
 734          * @param string $name
 735          * @param mixed $value
 736          */
 737         public function setProperty( $name, $value ) {
 738                 $this->mProperties[$name] = $value;
 739         }
 740
 741         /**
 742          * Get an additional output property
 743          * @since 1.21
 744          *
 745          * @param string $name
 746          * @return mixed Property value or null if not found
 747          */
 748         public function getProperty( $name ) {
 749                 return $this->mProperties[$name] ?? null;
 750         }
 751
 752         /**
 753          * checkLastModified tells the client to use the client-cached page if
 754          * possible. If successful, the OutputPage is disabled so that
 755          * any future call to OutputPage->output() have no effect.
 756          *
 757          * Side effect: sets mLastModified for Last-Modified header
 758          *
 759          * @param string $timestamp
 760          *
 761          * @return bool True if cache-ok headers was sent.
 762          */
 763         public function checkLastModified( $timestamp ) {
 764                 if ( !$timestamp || $timestamp == '19700101000000' ) {
 765                         wfDebug( __METHOD__ . ": CACHE DISABLED, NO TIMESTAMP\n" );
 766                         return false;
 767                 }
 768                 $config = $this->getConfig();
 769                 if ( !$config->get( 'CachePages' ) ) {
 770                         wfDebug( __METHOD__ . ": CACHE DISABLED\n" );
 771                         return false;
 772                 }
 773
 774                 $timestamp = wfTimestamp( TS_MW, $timestamp );
 775                 $modifiedTimes = [
 776                         'page' => $timestamp,
 777                         'user' => $this->getUser()->getTouched(),
 778                         'epoch' => $config->get( 'CacheEpoch' )
 779                 ];
 780                 if ( $config->get( 'UseSquid' ) ) {
 781                         $modifiedTimes['sepoch'] = wfTimestamp( TS_MW, $this->getCdnCacheEpoch(
 782                                 time(),
 783                                 $config->get( 'SquidMaxage' )
 784                         ) );
 785                 }
 786                 Hooks::run( 'OutputPageCheckLastModified', [ &$modifiedTimes, $this ] );
 787
 788                 $maxModified = max( $modifiedTimes );
 789                 $this->mLastModified = wfTimestamp( TS_RFC2822, $maxModified );
 790
 791                 $clientHeader = $this->getRequest()->getHeader( 'If-Modified-Since' );
 792                 if ( $clientHeader === false ) {
 793                         wfDebug( __METHOD__ . ": client did not send If-Modified-Since header", 'private' );
 794                         return false;
 795                 }
 796
 797                 # IE sends sizes after the date like this:
 798                 # Wed, 20 Aug 2003 06:51:19 GMT; length=5202
 799                 # this breaks strtotime().
 800                 $clientHeader = preg_replace( '/;.*$/', '', $clientHeader );
 801
 802                 Wikimedia\suppressWarnings(); // E_STRICT system time warnings
 803                 $clientHeaderTime = strtotime( $clientHeader );
 804                 Wikimedia\restoreWarnings();
 805                 if ( !$clientHeaderTime ) {
 806                         wfDebug( __METHOD__
 807                                 . ": unable to parse the client's If-Modified-Since header: $clientHeader\n" );
 808                         return false;
 809                 }
 810                 $clientHeaderTime = wfTimestamp( TS_MW, $clientHeaderTime );
 811
 812                 # Make debug info
 813                 $info = '';
 814                 foreach ( $modifiedTimes as $name => $value ) {
 815                         if ( $info !== '' ) {
 816                                 $info .= ', ';
 817                         }
 818                         $info .= "$name=" . wfTimestamp( TS_ISO_8601, $value );
 819                 }
 820
 821                 wfDebug( __METHOD__ . ": client sent If-Modified-Since: " .
 822                         wfTimestamp( TS_ISO_8601, $clientHeaderTime ), 'private' );
 823                 wfDebug( __METHOD__ . ": effective Last-Modified: " .
 824                         wfTimestamp( TS_ISO_8601, $maxModified ), 'private' );
 825                 if ( $clientHeaderTime < $maxModified ) {
 826                         wfDebug( __METHOD__ . ": STALE, $info", 'private' );
 827                         return false;
 828                 }
 829
 830                 # Not modified
 831                 # Give a 304 Not Modified response code and disable body output
 832                 wfDebug( __METHOD__ . ": NOT MODIFIED, $info", 'private' );
 833                 ini_set( 'zlib.output_compression', 0 );
 834                 $this->getRequest()->response()->statusHeader( 304 );
 835                 $this->sendCacheControl();
 836                 $this->disable();
 837
 838                 // Don't output a compressed blob when using ob_gzhandler;
 839                 // it's technically against HTTP spec and seems to confuse
 840                 // Firefox when the response gets split over two packets.
 841                 wfClearOutputBuffers();
 842
 843                 return true;
 844         }
 845
 846         /**
 847          * @param int $reqTime Time of request (eg. now)
 848          * @param int $maxAge Cache TTL in seconds
 849          * @return int Timestamp
 850          */
 851         private function getCdnCacheEpoch( $reqTime, $maxAge ) {
 852                 // Ensure Last-Modified is never more than (wgSquidMaxage) in the past,
 853                 // because even if the wiki page content hasn't changed since, static
 854                 // resources may have changed (skin HTML, interface messages, urls, etc.)
 855                 // and must roll-over in a timely manner (T46570)
 856                 return $reqTime - $maxAge;
 857         }
 858
 859         /**
 860          * Override the last modified timestamp
 861          *
 862          * @param string $timestamp New timestamp, in a format readable by
 863          *        wfTimestamp()
 864          */
 865         public function setLastModified( $timestamp ) {
 866                 $this->mLastModified = wfTimestamp( TS_RFC2822, $timestamp );
 867         }
 868
 869         /**
 870          * Set the robot policy for the page: <http://www.robotstxt.org/meta.html>
 871          *
 872          * @param string $policy The literal string to output as the contents of
 873          *   the meta tag.  Will be parsed according to the spec and output in
 874          *   standardized form.
 875          * @return null
 876          */
 877         public function setRobotPolicy( $policy ) {
 878                 $policy = Article::formatRobotPolicy( $policy );
 879
 880                 if ( isset( $policy['index'] ) ) {
 881                         $this->setIndexPolicy( $policy['index'] );
 882                 }
 883                 if ( isset( $policy['follow'] ) ) {
 884                         $this->setFollowPolicy( $policy['follow'] );
 885                 }
 886         }
 887
 888         /**
 889          * Set the index policy for the page, but leave the follow policy un-
 890          * touched.
 891          *
 892          * @param string $policy Either 'index' or 'noindex'.
 893          * @return null
 894          */
 895         public function setIndexPolicy( $policy ) {
 896                 $policy = trim( $policy );
 897                 if ( in_array( $policy, [ 'index', 'noindex' ] ) ) {
 898                         $this->mIndexPolicy = $policy;
 899                 }
 900         }
 901
 902         /**
 903          * Set the follow policy for the page, but leave the index policy un-
 904          * touched.
 905          *
 906          * @param string $policy Either 'follow' or 'nofollow'.
 907          * @return null
 908          */
 909         public function setFollowPolicy( $policy ) {
 910                 $policy = trim( $policy );
 911                 if ( in_array( $policy, [ 'follow', 'nofollow' ] ) ) {
 912                         $this->mFollowPolicy = $policy;
 913                 }
 914         }
 915
 916         /**
 917          * "HTML title" means the contents of "<title>".
 918          * It is stored as plain, unescaped text and will be run through htmlspecialchars in the skin file.
 919          *
 920          * @param string|Message $name
 921          */
 922         public function setHTMLTitle( $name ) {
 923                 if ( $name instanceof Message ) {
 924                         $this->mHTMLtitle = $name->setContext( $this->getContext() )->text();
 925                 } else {
 926                         $this->mHTMLtitle = $name;
 927                 }
 928         }
 929
 930         /**
 931          * Return the "HTML title", i.e. the content of the "<title>" tag.
 932          *
 933          * @return string
 934          */
 935         public function getHTMLTitle() {
 936                 return $this->mHTMLtitle;
 937         }
 938
 939         /**
 940          * Set $mRedirectedFrom, the Title of the page which redirected us to the current page.
 941          *
 942          * @param Title $t
 943          */
 944         public function setRedirectedFrom( $t ) {
 945                 $this->mRedirectedFrom = $t;
 946         }
 947
 948         /**
 949          * "Page title" means the contents of \<h1\>. It is stored as a valid HTML
 950          * fragment. This function allows good tags like \<sup\> in the \<h1\> tag,
 951          * but not bad tags like \<script\>. This function automatically sets
 952          * \<title\> to the same content as \<h1\> but with all tags removed. Bad
 953          * tags that were escaped in \<h1\> will still be escaped in \<title\>, and
 954          * good tags like \<i\> will be dropped entirely.
 955          *
 956          * @param string|Message $name
 957          */
 958         public function setPageTitle( $name ) {
 959                 if ( $name instanceof Message ) {
 960                         $name = $name->setContext( $this->getContext() )->text();
 961                 }
 962
 963                 # change "<script>foo&bar</script>" to "&lt;script&gt;foo&amp;bar&lt;/script&gt;"
 964                 # but leave "<i>foobar</i>" alone
 965                 $nameWithTags = Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags( $name ) );
 966                 $this->mPageTitle = $nameWithTags;
 967
 968                 # change "<i>foo&amp;bar</i>" to "foo&bar"
 969                 $this->setHTMLTitle(
 970                         $this->msg( 'pagetitle' )->rawParams( Sanitizer::stripAllTags( $nameWithTags ) )
 971                                 ->inContentLanguage()
 972                 );
 973         }
 974
 975         /**
 976          * Return the "page title", i.e. the content of the \<h1\> tag.
 977          *
 978          * @return string
 979          */
 980         public function getPageTitle() {
 981                 return $this->mPageTitle;
 982         }
 983
 984         /**
 985          * Same as page title but only contains name of the page, not any other text.
 986          *
 987          * @since 1.32
 988          * @param string $html Page title text.
 989          * @see OutputPage::setPageTitle
 990          */
 991         public function setDisplayTitle( $html ) {
 992                 $this->displayTitle = $html;
 993         }
 994
 995         /**
 996          * Returns page display title.
 997          *
 998          * Performs some normalization, but this not as strict the magic word.
 999          *
1000          * @since 1.32
1001          * @return string HTML
1002          */
1003         public function getDisplayTitle() {
1004                 $html = $this->displayTitle;
1005                 if ( $html === null ) {
1006                         $html = $this->getTitle()->getPrefixedText();
1007                 }
1008
1009                 return Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags( $html ) );
1010         }
1011
1012         /**
1013          * Returns page display title without namespace prefix if possible.
1014          *
1015          * @since 1.32
1016          * @return string HTML
1017          */
1018         public function getUnprefixedDisplayTitle() {
1019                 $text = $this->getDisplayTitle();
1020                 $nsPrefix = $this->getTitle()->getNsText() . ':';
1021                 $prefix = preg_quote( $nsPrefix, '/' );
1022
1023                 return preg_replace( "/^$prefix/i", '', $text );
1024         }
1025
1026         /**
1027          * Set the Title object to use
1028          *
1029          * @param Title $t
1030          */
1031         public function setTitle( Title $t ) {
1032                 $this->getContext()->setTitle( $t );
1033         }
1034
1035         /**
1036          * Replace the subtitle with $str
1037          *
1038          * @param string|Message $str New value of the subtitle. String should be safe HTML.
1039          */
1040         public function setSubtitle( $str ) {
1041                 $this->clearSubtitle();
1042                 $this->addSubtitle( $str );
1043         }
1044
1045         /**
1046          * Add $str to the subtitle
1047          *
1048          * @param string|Message $str String or Message to add to the subtitle. String should be safe HTML.
1049          */
1050         public function addSubtitle( $str ) {
1051                 if ( $str instanceof Message ) {
1052                         $this->mSubtitle[] = $str->setContext( $this->getContext() )->parse();
1053                 } else {
1054                         $this->mSubtitle[] = $str;
1055                 }
1056         }
1057
1058         /**
1059          * Build message object for a subtitle containing a backlink to a page
1060          *
1061          * @param Title $title Title to link to
1062          * @param array $query Array of additional parameters to include in the link
1063          * @return Message
1064          * @since 1.25
1065          */
1066         public static function buildBacklinkSubtitle( Title $title, $query = [] ) {
1067                 if ( $title->isRedirect() ) {
1068                         $query['redirect'] = 'no';
1069                 }
1070                 $linkRenderer = MediaWikiServices::getInstance()->getLinkRenderer();
1071                 return wfMessage( 'backlinksubtitle' )
1072                         ->rawParams( $linkRenderer->makeLink( $title, null, [], $query ) );
1073         }
1074
1075         /**
1076          * Add a subtitle containing a backlink to a page
1077          *
1078          * @param Title $title Title to link to
1079          * @param array $query Array of additional parameters to include in the link
1080          */
1081         public function addBacklinkSubtitle( Title $title, $query = [] ) {
1082                 $this->addSubtitle( self::buildBacklinkSubtitle( $title, $query ) );
1083         }
1084
1085         /**
1086          * Clear the subtitles
1087          */
1088         public function clearSubtitle() {
1089                 $this->mSubtitle = [];
1090         }
1091
1092         /**
1093          * Get the subtitle
1094          *
1095          * @return string
1096          */
1097         public function getSubtitle() {
1098                 return implode( "<br />\n\t\t\t\t", $this->mSubtitle );
1099         }
1100
1101         /**
1102          * Set the page as printable, i.e. it'll be displayed with all
1103          * print styles included
1104          */
1105         public function setPrintable() {
1106                 $this->mPrintable = true;
1107         }
1108
1109         /**
1110          * Return whether the page is "printable"
1111          *
1112          * @return bool
1113          */
1114         public function isPrintable() {
1115                 return $this->mPrintable;
1116         }
1117
1118         /**
1119          * Disable output completely, i.e. calling output() will have no effect
1120          */
1121         public function disable() {
1122                 $this->mDoNothing = true;
1123         }
1124
1125         /**
1126          * Return whether the output will be completely disabled
1127          *
1128          * @return bool
1129          */
1130         public function isDisabled() {
1131                 return $this->mDoNothing;
1132         }
1133
1134         /**
1135          * Show an "add new section" link?
1136          *
1137          * @return bool
1138          */
1139         public function showNewSectionLink() {
1140                 return $this->mNewSectionLink;
1141         }
1142
1143         /**
1144          * Forcibly hide the new section link?
1145          *
1146          * @return bool
1147          */
1148         public function forceHideNewSectionLink() {
1149                 return $this->mHideNewSectionLink;
1150         }
1151
1152         /**
1153          * Add or remove feed links in the page header
1154          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
1155          * for the new version
1156          * @see addFeedLink()
1157          *
1158          * @param bool $show True: add default feeds, false: remove all feeds
1159          */
1160         public function setSyndicated( $show = true ) {
1161                 if ( $show ) {
1162                         $this->setFeedAppendQuery( false );
1163                 } else {
1164                         $this->mFeedLinks = [];
1165                 }
1166         }
1167
1168         /**
1169          * Add default feeds to the page header
1170          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
1171          * for the new version
1172          * @see addFeedLink()
1173          *
1174          * @param string $val Query to append to feed links or false to output
1175          *        default links
1176          */
1177         public function setFeedAppendQuery( $val ) {
1178                 $this->mFeedLinks = [];
1179
1180                 foreach ( $this->getConfig()->get( 'AdvertisedFeedTypes' ) as $type ) {
1181                         $query = "feed=$type";
1182                         if ( is_string( $val ) ) {
1183                                 $query .= '&' . $val;
1184                         }
1185                         $this->mFeedLinks[$type] = $this->getTitle()->getLocalURL( $query );
1186                 }
1187         }
1188
1189         /**
1190          * Add a feed link to the page header
1191          *
1192          * @param string $format Feed type, should be a key of $wgFeedClasses
1193          * @param string $href URL
1194          */
1195         public function addFeedLink( $format, $href ) {
1196                 if ( in_array( $format, $this->getConfig()->get( 'AdvertisedFeedTypes' ) ) ) {
1197                         $this->mFeedLinks[$format] = $href;
1198                 }
1199         }
1200
1201         /**
1202          * Should we output feed links for this page?
1203          * @return bool
1204          */
1205         public function isSyndicated() {
1206                 return count( $this->mFeedLinks ) > 0;
1207         }
1208
1209         /**
1210          * Return URLs for each supported syndication format for this page.
1211          * @return array Associating format keys with URLs
1212          */
1213         public function getSyndicationLinks() {
1214                 return $this->mFeedLinks;
1215         }
1216
1217         /**
1218          * Will currently always return null
1219          *
1220          * @return null
1221          */
1222         public function getFeedAppendQuery() {
1223                 return $this->mFeedLinksAppendQuery;
1224         }
1225
1226         /**
1227          * Set whether the displayed content is related to the source of the
1228          * corresponding article on the wiki
1229          * Setting true will cause the change "article related" toggle to true
1230          *
1231          * @param bool $newVal
1232          */
1233         public function setArticleFlag( $newVal ) {
1234                 $this->mIsArticle = $newVal;
1235                 if ( $newVal ) {
1236                         $this->mIsArticleRelated = $newVal;
1237                 }
1238         }
1239
1240         /**
1241          * Return whether the content displayed page is related to the source of
1242          * the corresponding article on the wiki
1243          *
1244          * @return bool
1245          */
1246         public function isArticle() {
1247                 return $this->mIsArticle;
1248         }
1249
1250         /**
1251          * Set whether this page is related an article on the wiki
1252          * Setting false will cause the change of "article flag" toggle to false
1253          *
1254          * @param bool $newVal
1255          */
1256         public function setArticleRelated( $newVal ) {
1257                 $this->mIsArticleRelated = $newVal;
1258                 if ( !$newVal ) {
1259                         $this->mIsArticle = false;
1260                 }
1261         }
1262
1263         /**
1264          * Return whether this page is related an article on the wiki
1265          *
1266          * @return bool
1267          */
1268         public function isArticleRelated() {
1269                 return $this->mIsArticleRelated;
1270         }
1271
1272         /**
1273          * Set whether the standard copyright should be shown for the current page.
1274          *
1275          * @param bool $hasCopyright
1276          */
1277         public function setCopyright( $hasCopyright ) {
1278                 $this->mHasCopyright = $hasCopyright;
1279         }
1280
1281         /**
1282          * Return whether the standard copyright should be shown for the current page.
1283          * By default, it is true for all articles but other pages
1284          * can signal it by using setCopyright( true ).
1285          *
1286          * Used by SkinTemplate to decided whether to show the copyright.
1287          *
1288          * @return bool
1289          */
1290         public function showsCopyright() {
1291                 return $this->isArticle() || $this->mHasCopyright;
1292         }
1293
1294         /**
1295          * Add new language links
1296          *
1297          * @param string[] $newLinkArray Array of interwiki-prefixed (non DB key) titles
1298          *                               (e.g. 'fr:Test page')
1299          */
1300         public function addLanguageLinks( array $newLinkArray ) {
1301                 $this->mLanguageLinks = array_merge( $this->mLanguageLinks, $newLinkArray );
1302         }
1303
1304         /**
1305          * Reset the language links and add new language links
1306          *
1307          * @param string[] $newLinkArray Array of interwiki-prefixed (non DB key) titles
1308          *                               (e.g. 'fr:Test page')
1309          */
1310         public function setLanguageLinks( array $newLinkArray ) {
1311                 $this->mLanguageLinks = $newLinkArray;
1312         }
1313
1314         /**
1315          * Get the list of language links
1316          *
1317          * @return string[] Array of interwiki-prefixed (non DB key) titles (e.g. 'fr:Test page')
1318          */
1319         public function getLanguageLinks() {
1320                 return $this->mLanguageLinks;
1321         }
1322
1323         /**
1324          * Add an array of categories, with names in the keys
1325          *
1326          * @param array $categories Mapping category name => sort key
1327          */
1328         public function addCategoryLinks( array $categories ) {
1329                 if ( !$categories ) {
1330                         return;
1331                 }
1332
1333                 $res = $this->addCategoryLinksToLBAndGetResult( $categories );
1334
1335                 # Set all the values to 'normal'.
1336                 $categories = array_fill_keys( array_keys( $categories ), 'normal' );
1337
1338                 # Mark hidden categories
1339                 foreach ( $res as $row ) {
1340                         if ( isset( $row->pp_value ) ) {
1341                                 $categories[$row->page_title] = 'hidden';
1342                         }
1343                 }
1344
1345                 // Avoid PHP 7.1 warning of passing $this by reference
1346                 $outputPage = $this;
1347                 # Add the remaining categories to the skin
1348                 if ( Hooks::run(
1349                         'OutputPageMakeCategoryLinks',
1350                         [ &$outputPage, $categories, &$this->mCategoryLinks ] )
1351                 ) {
1352                         $services = MediaWikiServices::getInstance();
1353                         $linkRenderer = $services->getLinkRenderer();
1354                         foreach ( $categories as $category => $type ) {
1355                                 // array keys will cast numeric category names to ints, so cast back to string
1356                                 $category = (string)$category;
1357                                 $origcategory = $category;
1358                                 $title = Title::makeTitleSafe( NS_CATEGORY, $category );
1359                                 if ( !$title ) {
1360                                         continue;
1361                                 }
1362                                 $services->getContentLanguage()->findVariantLink( $category, $title, true );
1363                                 if ( $category != $origcategory && array_key_exists( $category, $categories ) ) {
1364                                         continue;
1365                                 }
1366                                 $text = $services->getContentLanguage()->convertHtml( $title->getText() );
1367                                 $this->mCategories[$type][] = $title->getText();
1368                                 $this->mCategoryLinks[$type][] = $linkRenderer->makeLink( $title, new HtmlArmor( $text ) );
1369                         }
1370                 }
1371         }
1372
1373         /**
1374          * @param array $categories
1375          * @return bool|IResultWrapper
1376          */
1377         protected function addCategoryLinksToLBAndGetResult( array $categories ) {
1378                 # Add the links to a LinkBatch
1379                 $arr = [ NS_CATEGORY => $categories ];
1380                 $lb = new LinkBatch;
1381                 $lb->setArray( $arr );
1382
1383                 # Fetch existence plus the hiddencat property
1384                 $dbr = wfGetDB( DB_REPLICA );
1385                 $fields = array_merge(
1386                         LinkCache::getSelectFields(),
1387                         [ 'page_namespace', 'page_title', 'pp_value' ]
1388                 );
1389
1390                 $res = $dbr->select( [ 'page', 'page_props' ],
1391                         $fields,
1392                         $lb->constructSet( 'page', $dbr ),
1393                         __METHOD__,
1394                         [],
1395                         [ 'page_props' => [ 'LEFT JOIN', [
1396                                 'pp_propname' => 'hiddencat',
1397                                 'pp_page = page_id'
1398                         ] ] ]
1399                 );
1400
1401                 # Add the results to the link cache
1402                 $linkCache = MediaWikiServices::getInstance()->getLinkCache();
1403                 $lb->addResultToCache( $linkCache, $res );
1404
1405                 return $res;
1406         }
1407
1408         /**
1409          * Reset the category links (but not the category list) and add $categories
1410          *
1411          * @param array $categories Mapping category name => sort key
1412          */
1413         public function setCategoryLinks( array $categories ) {
1414                 $this->mCategoryLinks = [];
1415                 $this->addCategoryLinks( $categories );
1416         }
1417
1418         /**
1419          * Get the list of category links, in a 2-D array with the following format:
1420          * $arr[$type][] = $link, where $type is either "normal" or "hidden" (for
1421          * hidden categories) and $link a HTML fragment with a link to the category
1422          * page
1423          *
1424          * @return array
1425          */
1426         public function getCategoryLinks() {
1427                 return $this->mCategoryLinks;
1428         }
1429
1430         /**
1431          * Get the list of category names this page belongs to.
1432          *
1433          * @param string $type The type of categories which should be returned. Possible values:
1434          *  * all: all categories of all types
1435          *  * hidden: only the hidden categories
1436          *  * normal: all categories, except hidden categories
1437          * @return array Array of strings
1438          */
1439         public function getCategories( $type = 'all' ) {
1440                 if ( $type === 'all' ) {
1441                         $allCategories = [];
1442                         foreach ( $this->mCategories as $categories ) {
1443                                 $allCategories = array_merge( $allCategories, $categories );
1444                         }
1445                         return $allCategories;
1446                 }
1447                 if ( !isset( $this->mCategories[$type] ) ) {
1448                         throw new InvalidArgumentException( 'Invalid category type given: ' . $type );
1449                 }
1450                 return $this->mCategories[$type];
1451         }
1452
1453         /**
1454          * Add an array of indicators, with their identifiers as array
1455          * keys and HTML contents as values.
1456          *
1457          * In case of duplicate keys, existing values are overwritten.
1458          *
1459          * @param array $indicators
1460          * @since 1.25
1461          */
1462         public function setIndicators( array $indicators ) {
1463                 $this->mIndicators = $indicators + $this->mIndicators;
1464                 // Keep ordered by key
1465                 ksort( $this->mIndicators );
1466         }
1467
1468         /**
1469          * Get the indicators associated with this page.
1470          *
1471          * The array will be internally ordered by item keys.
1472          *
1473          * @return array Keys: identifiers, values: HTML contents
1474          * @since 1.25
1475          */
1476         public function getIndicators() {
1477                 return $this->mIndicators;
1478         }
1479
1480         /**
1481          * Adds help link with an icon via page indicators.
1482          * Link target can be overridden by a local message containing a wikilink:
1483          * the message key is: lowercase action or special page name + '-helppage'.
1484          * @param string $to Target MediaWiki.org page title or encoded URL.
1485          * @param bool $overrideBaseUrl Whether $url is a full URL, to avoid MW.o.
1486          * @since 1.25
1487          */
1488         public function addHelpLink( $to, $overrideBaseUrl = false ) {
1489                 $this->addModuleStyles( 'mediawiki.helplink' );
1490                 $text = $this->msg( 'helppage-top-gethelp' )->escaped();
1491
1492                 if ( $overrideBaseUrl ) {
1493                         $helpUrl = $to;
1494                 } else {
1495                         $toUrlencoded = wfUrlencode( str_replace( ' ', '_', $to ) );
1496                         $helpUrl = "//www.mediawiki.org/wiki/Special:MyLanguage/$toUrlencoded";
1497                 }
1498
1499                 $link = Html::rawElement(
1500                         'a',
1501                         [
1502                                 'href' => $helpUrl,
1503                                 'target' => '_blank',
1504                                 'class' => 'mw-helplink',
1505                         ],
1506                         $text
1507                 );
1508
1509                 $this->setIndicators( [ 'mw-helplink' => $link ] );
1510         }
1511
1512         /**
1513          * Do not allow scripts which can be modified by wiki users to load on this page;
1514          * only allow scripts bundled with, or generated by, the software.
1515          * Site-wide styles are controlled by a config setting, since they can be
1516          * used to create a custom skin/theme, but not user-specific ones.
1517          *
1518          * @todo this should be given a more accurate name
1519          */
1520         public function disallowUserJs() {
1521                 $this->reduceAllowedModules(
1522                         ResourceLoaderModule::TYPE_SCRIPTS,
1523                         ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL
1524                 );
1525
1526                 // Site-wide styles are controlled by a config setting, see T73621
1527                 // for background on why. User styles are never allowed.
1528                 if ( $this->getConfig()->get( 'AllowSiteCSSOnRestrictedPages' ) ) {
1529                         $styleOrigin = ResourceLoaderModule::ORIGIN_USER_SITEWIDE;
1530                 } else {
1531                         $styleOrigin = ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL;
1532                 }
1533                 $this->reduceAllowedModules(
1534                         ResourceLoaderModule::TYPE_STYLES,
1535                         $styleOrigin
1536                 );
1537         }
1538
1539         /**
1540          * Show what level of JavaScript / CSS untrustworthiness is allowed on this page
1541          * @see ResourceLoaderModule::$origin
1542          * @param string $type ResourceLoaderModule TYPE_ constant
1543          * @return int ResourceLoaderModule ORIGIN_ class constant
1544          */
1545         public function getAllowedModules( $type ) {
1546                 if ( $type == ResourceLoaderModule::TYPE_COMBINED ) {
1547                         return min( array_values( $this->mAllowedModules ) );
1548                 } else {
1549                         return $this->mAllowedModules[$type] ?? ResourceLoaderModule::ORIGIN_ALL;
1550                 }
1551         }
1552
1553         /**
1554          * Limit the highest level of CSS/JS untrustworthiness allowed.
1555          *
1556          * If passed the same or a higher level than the current level of untrustworthiness set, the
1557          * level will remain unchanged.
1558          *
1559          * @param string $type
1560          * @param int $level ResourceLoaderModule class constant
1561          */
1562         public function reduceAllowedModules( $type, $level ) {
1563                 $this->mAllowedModules[$type] = min( $this->getAllowedModules( $type ), $level );
1564         }
1565
1566         /**
1567          * Prepend $text to the body HTML
1568          *
1569          * @param string $text HTML
1570          */
1571         public function prependHTML( $text ) {
1572                 $this->mBodytext = $text . $this->mBodytext;
1573         }
1574
1575         /**
1576          * Append $text to the body HTML
1577          *
1578          * @param string $text HTML
1579          */
1580         public function addHTML( $text ) {
1581                 $this->mBodytext .= $text;
1582         }
1583
1584         /**
1585          * Shortcut for adding an Html::element via addHTML.
1586          *
1587          * @since 1.19
1588          *
1589          * @param string $element
1590          * @param array $attribs
1591          * @param string $contents
1592          */
1593         public function addElement( $element, array $attribs = [], $contents = '' ) {
1594                 $this->addHTML( Html::element( $element, $attribs, $contents ) );
1595         }
1596
1597         /**
1598          * Clear the body HTML
1599          */
1600         public function clearHTML() {
1601                 $this->mBodytext = '';
1602         }
1603
1604         /**
1605          * Get the body HTML
1606          *
1607          * @return string HTML
1608          */
1609         public function getHTML() {
1610                 return $this->mBodytext;
1611         }
1612
1613         /**
1614          * Get/set the ParserOptions object to use for wikitext parsing
1615          *
1616          * @param ParserOptions|null $options Either the ParserOption to use or null to only get the
1617          *   current ParserOption object. This parameter is deprecated since 1.31.
1618          * @return ParserOptions
1619          */
1620         public function parserOptions( $options = null ) {
1621                 if ( $options !== null ) {
1622                         wfDeprecated( __METHOD__ . ' with non-null $options', '1.31' );
1623                 }
1624
1625                 if ( $options !== null && !empty( $options->isBogus ) ) {
1626                         // Someone is trying to set a bogus pre-$wgUser PO. Check if it has
1627                         // been changed somehow, and keep it if so.
1628                         $anonPO = ParserOptions::newFromAnon();
1629                         $anonPO->setAllowUnsafeRawHtml( false );
1630                         if ( !$options->matches( $anonPO ) ) {
1631                                 wfLogWarning( __METHOD__ . ': Setting a changed bogus ParserOptions: ' . wfGetAllCallers( 5 ) );
1632                                 $options->isBogus = false;
1633                         }
1634                 }
1635
1636                 if ( !$this->mParserOptions ) {
1637                         if ( !$this->getContext()->getUser()->isSafeToLoad() ) {
1638                                 // $wgUser isn't unstubbable yet, so don't try to get a
1639                                 // ParserOptions for it. And don't cache this ParserOptions
1640                                 // either.
1641                                 $po = ParserOptions::newFromAnon();
1642                                 $po->setAllowUnsafeRawHtml( false );
1643                                 $po->isBogus = true;
1644                                 if ( $options !== null ) {
1645                                         $this->mParserOptions = empty( $options->isBogus ) ? $options : null;
1646                                 }
1647                                 return $po;
1648                         }
1649
1650                         $this->mParserOptions = ParserOptions::newFromContext( $this->getContext() );
1651                         $this->mParserOptions->setAllowUnsafeRawHtml( false );
1652                 }
1653
1654                 if ( $options !== null && !empty( $options->isBogus ) ) {
1655                         // They're trying to restore the bogus pre-$wgUser PO. Do the right
1656                         // thing.
1657                         return wfSetVar( $this->mParserOptions, null, true );
1658                 } else {
1659                         return wfSetVar( $this->mParserOptions, $options );
1660                 }
1661         }
1662
1663         /**
1664          * Set the revision ID which will be seen by the wiki text parser
1665          * for things such as embedded {{REVISIONID}} variable use.
1666          *
1667          * @param int|null $revid A positive integer, or null
1668          * @return mixed Previous value
1669          */
1670         public function setRevisionId( $revid ) {
1671                 $val = is_null( $revid ) ? null : intval( $revid );
1672                 return wfSetVar( $this->mRevisionId, $val, true );
1673         }
1674
1675         /**
1676          * Get the displayed revision ID
1677          *
1678          * @return int
1679          */
1680         public function getRevisionId() {
1681                 return $this->mRevisionId;
1682         }
1683
1684         /**
1685          * Set the timestamp of the revision which will be displayed. This is used
1686          * to avoid a extra DB call in Skin::lastModified().
1687          *
1688          * @param string|null $timestamp
1689          * @return mixed Previous value
1690          */
1691         public function setRevisionTimestamp( $timestamp ) {
1692                 return wfSetVar( $this->mRevisionTimestamp, $timestamp, true );
1693         }
1694
1695         /**
1696          * Get the timestamp of displayed revision.
1697          * This will be null if not filled by setRevisionTimestamp().
1698          *
1699          * @return string|null
1700          */
1701         public function getRevisionTimestamp() {
1702                 return $this->mRevisionTimestamp;
1703         }
1704
1705         /**
1706          * Set the displayed file version
1707          *
1708          * @param File|null $file
1709          * @return mixed Previous value
1710          */
1711         public function setFileVersion( $file ) {
1712                 $val = null;
1713                 if ( $file instanceof File && $file->exists() ) {
1714                         $val = [ 'time' => $file->getTimestamp(), 'sha1' => $file->getSha1() ];
1715                 }
1716                 return wfSetVar( $this->mFileVersion, $val, true );
1717         }
1718
1719         /**
1720          * Get the displayed file version
1721          *
1722          * @return array|null ('time' => MW timestamp, 'sha1' => sha1)
1723          */
1724         public function getFileVersion() {
1725                 return $this->mFileVersion;
1726         }
1727
1728         /**
1729          * Get the templates used on this page
1730          *
1731          * @return array (namespace => dbKey => revId)
1732          * @since 1.18
1733          */
1734         public function getTemplateIds() {
1735                 return $this->mTemplateIds;
1736         }
1737
1738         /**
1739          * Get the files used on this page
1740          *
1741          * @return array (dbKey => array('time' => MW timestamp or null, 'sha1' => sha1 or ''))
1742          * @since 1.18
1743          */
1744         public function getFileSearchOptions() {
1745                 return $this->mImageTimeKeys;
1746         }
1747
1748         /**
1749          * Convert wikitext to HTML and add it to the buffer
1750          * Default assumes that the current page title will be used.
1751          *
1752          * @param string $text
1753          * @param bool $linestart Is this the start of a line?
1754          * @param bool $interface Is this text in the user interface language?
1755          * @throws MWException
1756          * @deprecated since 1.32 due to untidy output; use
1757          *    addWikiTextAsInterface() if $interface is default value or true,
1758          *    or else addWikiTextAsContent() if $interface is false.
1759          */
1760         public function addWikiText( $text, $linestart = true, $interface = true ) {
1761                 wfDeprecated( __METHOD__, '1.32' );
1762                 $title = $this->getTitle();
1763                 if ( !$title ) {
1764                         throw new MWException( 'Title is null' );
1765                 }
1766                 $this->addWikiTextTitleInternal( $text, $title, $linestart, /*tidy*/false, $interface );
1767         }
1768
1769         /**
1770          * Convert wikitext *in the user interface language* to HTML and
1771          * add it to the buffer. The result will not be
1772          * language-converted, as user interface messages are already
1773          * localized into a specific variant.  Assumes that the current
1774          * page title will be used if optional $title is not
1775          * provided. Output will be tidy.
1776          *
1777          * @param string $text Wikitext in the user interface language
1778          * @param bool $linestart Is this the start of a line? (Defaults to true)
1779          * @param Title|null $title Optional title to use; default of `null`
1780          *   means use current page title.
1781          * @throws MWException if $title is not provided and OutputPage::getTitle()
1782          *   is null
1783          * @since 1.32
1784          */
1785         public function addWikiTextAsInterface(
1786                 $text, $linestart = true, Title $title = null
1787         ) {
1788                 if ( $title === null ) {
1789                         $title = $this->getTitle();
1790                 }
1791                 if ( !$title ) {
1792                         throw new MWException( 'Title is null' );
1793                 }
1794                 $this->addWikiTextTitleInternal( $text, $title, $linestart, /*tidy*/true, /*interface*/true );
1795         }
1796
1797         /**
1798          * Convert wikitext *in the user interface language* to HTML and
1799          * add it to the buffer with a `<div class="$wrapperClass">`
1800          * wrapper.  The result will not be language-converted, as user
1801          * interface messages as already localized into a specific
1802          * variant.  The $text will be parsed in start-of-line context.
1803          * Output will be tidy.
1804          *
1805          * @param string $wrapperClass The class attribute value for the <div>
1806          *   wrapper in the output HTML
1807          * @param string $text Wikitext in the user interface language
1808          * @since 1.32
1809          */
1810         public function wrapWikiTextAsInterface(
1811                 $wrapperClass, $text
1812         ) {
1813                 $this->addWikiTextTitleInternal(
1814                         $text, $this->getTitle(),
1815                         /*linestart*/true, /*tidy*/true, /*interface*/true,
1816                         $wrapperClass
1817                 );
1818         }
1819
1820         /**
1821          * Convert wikitext *in the page content language* to HTML and add
1822          * it to the buffer.  The result with be language-converted to the
1823          * user's preferred variant.  Assumes that the current page title
1824          * will be used if optional $title is not provided. Output will be
1825          * tidy.
1826          *
1827          * @param string $text Wikitext in the page content language
1828          * @param bool $linestart Is this the start of a line? (Defaults to true)
1829          * @param Title|null $title Optional title to use; default of `null`
1830          *   means use current page title.
1831          * @throws MWException if $title is not provided and OutputPage::getTitle()
1832          *   is null
1833          * @since 1.32
1834          */
1835         public function addWikiTextAsContent(
1836                 $text, $linestart = true, Title $title = null
1837         ) {
1838                 if ( $title === null ) {
1839                         $title = $this->getTitle();
1840                 }
1841                 if ( !$title ) {
1842                         throw new MWException( 'Title is null' );
1843                 }
1844                 $this->addWikiTextTitleInternal( $text, $title, $linestart, /*tidy*/true, /*interface*/false );
1845         }
1846
1847         /**
1848          * Add wikitext with a custom Title object
1849          *
1850          * @param string $text Wikitext
1851          * @param Title $title
1852          * @param bool $linestart Is this the start of a line?
1853          * @deprecated since 1.32 due to untidy output; use
1854          *   addWikiTextAsInterface()
1855          */
1856         public function addWikiTextWithTitle( $text, Title $title, $linestart = true ) {
1857                 wfDeprecated( __METHOD__, '1.32' );
1858                 $this->addWikiTextTitleInternal( $text, $title, $linestart, /*tidy*/false, /*interface*/false );
1859         }
1860
1861         /**
1862          * Add wikitext *in content language* with a custom Title object.
1863          * Output will be tidy.
1864          *
1865          * @param string $text Wikitext in content language
1866          * @param Title $title
1867          * @param bool $linestart Is this the start of a line?
1868          * @deprecated since 1.32 to rename methods consistently; use
1869          *   addWikiTextAsContent()
1870          */
1871         function addWikiTextTitleTidy( $text, Title $title, $linestart = true ) {
1872                 wfDeprecated( __METHOD__, '1.32' );
1873                 $this->addWikiTextTitleInternal( $text, $title, $linestart, /*tidy*/true, /*interface*/false );
1874         }
1875
1876         /**
1877          * Add wikitext *in content language*. Output will be tidy.
1878          *
1879          * @param string $text Wikitext in content language
1880          * @param bool $linestart Is this the start of a line?
1881          * @deprecated since 1.32 to rename methods consistently; use
1882          *   addWikiTextAsContent()
1883          */
1884         public function addWikiTextTidy( $text, $linestart = true ) {
1885                 wfDeprecated( __METHOD__, '1.32' );
1886                 $title = $this->getTitle();
1887                 if ( !$title ) {
1888                         throw new MWException( 'Title is null' );
1889                 }
1890                 $this->addWikiTextTitleInternal( $text, $title, $linestart, /*tidy*/true, /*interface*/false );
1891         }
1892
1893         /**
1894          * Add wikitext with a custom Title object.
1895          * Output is unwrapped.
1896          *
1897          * @param string $text Wikitext
1898          * @param Title $title
1899          * @param bool $linestart Is this the start of a line?
1900          * @param bool $tidy Whether to use tidy.
1901          *             Setting this to false (or omitting it) is deprecated
1902          *             since 1.32; all wikitext should be tidied.
1903          *             For backwards-compatibility with prior MW releases,
1904          *             you may wish to invoke this method but set $tidy=true;
1905          *             this will result in equivalent output to the non-deprecated
1906          *             addWikiTextAsContent()/addWikiTextAsInterface() methods.
1907          * @param bool $interface Whether it is an interface message
1908          *   (for example disables conversion)
1909          * @deprecated since 1.32, use addWikiTextAsContent() or
1910          *   addWikiTextAsInterface() (depending on $interface)
1911          */
1912         public function addWikiTextTitle( $text, Title $title, $linestart,
1913                 $tidy = false, $interface = false
1914         ) {
1915                 wfDeprecated( __METHOD__, '1.32' );
1916                 return $this->addWikiTextTitleInternal( $text, $title, $linestart, $tidy, $interface );
1917         }
1918
1919         /**
1920          * Add wikitext with a custom Title object.
1921          * Output is unwrapped.
1922          *
1923          * @param string $text Wikitext
1924          * @param Title $title
1925          * @param bool $linestart Is this the start of a line?
1926          * @param bool $tidy Whether to use tidy.
1927          *             Setting this to false (or omitting it) is deprecated
1928          *             since 1.32; all wikitext should be tidied.
1929          * @param bool $interface Whether it is an interface message
1930          *   (for example disables conversion)
1931          * @param string $wrapperClass if not empty, wraps the output in
1932          *   a `<div class="$wrapperClass">`
1933          * @private
1934          */
1935         private function addWikiTextTitleInternal(
1936                 $text, Title $title, $linestart, $tidy, $interface, $wrapperClass = null
1937         ) {
1938                 if ( !$tidy ) {
1939                         wfDeprecated( 'disabling tidy', '1.32' );
1940                 }
1941
1942                 $parserOutput = $this->parseInternal(
1943                         $text, $title, $linestart, $tidy, $interface, /*language*/null
1944                 );
1945
1946                 $this->addParserOutput( $parserOutput, [
1947                         'enableSectionEditLinks' => false,
1948                         'wrapperDivClass' => $wrapperClass ?? '',
1949                 ] );
1950         }
1951
1952         /**
1953          * Add all metadata associated with a ParserOutput object, but without the actual HTML. This
1954          * includes categories, language links, ResourceLoader modules, effects of certain magic words,
1955          * and so on.
1956          *
1957          * @since 1.24
1958          * @param ParserOutput $parserOutput
1959          */
1960         public function addParserOutputMetadata( ParserOutput $parserOutput ) {
1961                 $this->mLanguageLinks =
1962                         array_merge( $this->mLanguageLinks, $parserOutput->getLanguageLinks() );
1963                 $this->addCategoryLinks( $parserOutput->getCategories() );
1964                 $this->setIndicators( $parserOutput->getIndicators() );
1965                 $this->mNewSectionLink = $parserOutput->getNewSection();
1966                 $this->mHideNewSectionLink = $parserOutput->getHideNewSection();
1967
1968                 if ( !$parserOutput->isCacheable() ) {
1969                         $this->enableClientCache( false );
1970                 }
1971                 $this->mNoGallery = $parserOutput->getNoGallery();
1972                 $this->mHeadItems = array_merge( $this->mHeadItems, $parserOutput->getHeadItems() );
1973                 $this->addModules( $parserOutput->getModules() );
1974                 $this->addModuleScripts( $parserOutput->getModuleScripts() );
1975                 $this->addModuleStyles( $parserOutput->getModuleStyles() );
1976                 $this->addJsConfigVars( $parserOutput->getJsConfigVars() );
1977                 $this->mPreventClickjacking = $this->mPreventClickjacking
1978                         || $parserOutput->preventClickjacking();
1979
1980                 // Template versioning...
1981                 foreach ( (array)$parserOutput->getTemplateIds() as $ns => $dbks ) {
1982                         if ( isset( $this->mTemplateIds[$ns] ) ) {
1983                                 $this->mTemplateIds[$ns] = $dbks + $this->mTemplateIds[$ns];
1984                         } else {
1985                                 $this->mTemplateIds[$ns] = $dbks;
1986                         }
1987                 }
1988                 // File versioning...
1989                 foreach ( (array)$parserOutput->getFileSearchOptions() as $dbk => $data ) {
1990                         $this->mImageTimeKeys[$dbk] = $data;
1991                 }
1992
1993                 // Hooks registered in the object
1994                 $parserOutputHooks = $this->getConfig()->get( 'ParserOutputHooks' );
1995                 foreach ( $parserOutput->getOutputHooks() as $hookInfo ) {
1996                         list( $hookName, $data ) = $hookInfo;
1997                         if ( isset( $parserOutputHooks[$hookName] ) ) {
1998                                 $parserOutputHooks[$hookName]( $this, $parserOutput, $data );
1999                         }
2000                 }
2001
2002                 // Enable OOUI if requested via ParserOutput
2003                 if ( $parserOutput->getEnableOOUI() ) {
2004                         $this->enableOOUI();
2005                 }
2006
2007                 // Include parser limit report
2008                 if ( !$this->limitReportJSData ) {
2009                         $this->limitReportJSData = $parserOutput->getLimitReportJSData();
2010                 }
2011
2012                 // Link flags are ignored for now, but may in the future be
2013                 // used to mark individual language links.
2014                 $linkFlags = [];
2015                 // Avoid PHP 7.1 warning of passing $this by reference
2016                 $outputPage = $this;
2017                 Hooks::run( 'LanguageLinks', [ $this->getTitle(), &$this->mLanguageLinks, &$linkFlags ] );
2018                 Hooks::runWithoutAbort( 'OutputPageParserOutput', [ &$outputPage, $parserOutput ] );
2019
2020                 // This check must be after 'OutputPageParserOutput' runs in addParserOutputMetadata
2021                 // so that extensions may modify ParserOutput to toggle TOC.
2022                 // This cannot be moved to addParserOutputText because that is not
2023                 // called by EditPage for Preview.
2024                 if ( $parserOutput->getTOCHTML() ) {
2025                         $this->mEnableTOC = true;
2026                 }
2027         }
2028
2029         /**
2030          * Add the HTML and enhancements for it (like ResourceLoader modules) associated with a
2031          * ParserOutput object, without any other metadata.
2032          *
2033          * @since 1.24
2034          * @param ParserOutput $parserOutput
2035          * @param array $poOptions Options to ParserOutput::getText()
2036          */
2037         public function addParserOutputContent( ParserOutput $parserOutput, $poOptions = [] ) {
2038                 $this->addParserOutputText( $parserOutput, $poOptions );
2039
2040                 $this->addModules( $parserOutput->getModules() );
2041                 $this->addModuleScripts( $parserOutput->getModuleScripts() );
2042                 $this->addModuleStyles( $parserOutput->getModuleStyles() );
2043
2044                 $this->addJsConfigVars( $parserOutput->getJsConfigVars() );
2045         }
2046
2047         /**
2048          * Add the HTML associated with a ParserOutput object, without any metadata.
2049          *
2050          * @since 1.24
2051          * @param ParserOutput $parserOutput
2052          * @param array $poOptions Options to ParserOutput::getText()
2053          */
2054         public function addParserOutputText( ParserOutput $parserOutput, $poOptions = [] ) {
2055                 $text = $parserOutput->getText( $poOptions );
2056                 // Avoid PHP 7.1 warning of passing $this by reference
2057                 $outputPage = $this;
2058                 Hooks::runWithoutAbort( 'OutputPageBeforeHTML', [ &$outputPage, &$text ] );
2059                 $this->addHTML( $text );
2060         }
2061
2062         /**
2063          * Add everything from a ParserOutput object.
2064          *
2065          * @param ParserOutput $parserOutput
2066          * @param array $poOptions Options to ParserOutput::getText()
2067          */
2068         function addParserOutput( ParserOutput $parserOutput, $poOptions = [] ) {
2069                 $this->addParserOutputMetadata( $parserOutput );
2070                 $this->addParserOutputText( $parserOutput, $poOptions );
2071         }
2072
2073         /**
2074          * Add the output of a QuickTemplate to the output buffer
2075          *
2076          * @param QuickTemplate &$template
2077          */
2078         public function addTemplate( &$template ) {
2079                 $this->addHTML( $template->getHTML() );
2080         }
2081
2082         /**
2083          * Parse wikitext and return the HTML.
2084          *
2085          * @todo The output is wrapped in a <div> iff $interface is false; it's
2086          * probably best to always strip the wrapper.
2087          *
2088          * @param string $text
2089          * @param bool $linestart Is this the start of a line?
2090          * @param bool $interface Use interface language (instead of content language) while parsing
2091          *   language sensitive magic words like GRAMMAR and PLURAL.  This also disables
2092          *   LanguageConverter.
2093          * @param Language|null $language Target language object, will override $interface
2094          * @throws MWException
2095          * @return string HTML
2096          * @deprecated since 1.33, due to untidy output and inconsistent wrapper;
2097          *  use parseAsContent() if $interface is default value or false, or else
2098          *  parseAsInterface() if $interface is true.
2099          */
2100         public function parse( $text, $linestart = true, $interface = false, $language = null ) {
2101                 return $this->parseInternal(
2102                         $text, $this->getTitle(), $linestart, /*tidy*/false, $interface, $language
2103                 )->getText( [
2104                         'enableSectionEditLinks' => false,
2105                 ] );
2106         }
2107
2108         /**
2109          * Parse wikitext *in the page content language* and return the HTML.
2110          * The result will be language-converted to the user's preferred variant.
2111          * Output will be tidy.
2112          *
2113          * @param string $text Wikitext in the page content language
2114          * @param bool $linestart Is this the start of a line? (Defaults to true)
2115          * @throws MWException
2116          * @return string HTML
2117          * @since 1.33
2118          */
2119         public function parseAsContent( $text, $linestart = true ) {
2120                 return $this->parseInternal(
2121                         $text, $this->getTitle(), $linestart, /*tidy*/true, /*interface*/false, /*language*/null
2122                 )->getText( [
2123                         'enableSectionEditLinks' => false,
2124                         'wrapperDivClass' => ''
2125                 ] );
2126         }
2127
2128         /**
2129          * Parse wikitext *in the user interface language* and return the HTML.
2130          * The result will not be language-converted, as user interface messages
2131          * are already localized into a specific variant.
2132          * Output will be tidy.
2133          *
2134          * @param string $text Wikitext in the user interface language
2135          * @param bool $linestart Is this the start of a line? (Defaults to true)
2136          * @throws MWException
2137          * @return string HTML
2138          * @since 1.33
2139          */
2140         public function parseAsInterface( $text, $linestart = true ) {
2141                 return $this->parseInternal(
2142                         $text, $this->getTitle(), $linestart, /*tidy*/true, /*interface*/true, /*language*/null
2143                 )->getText( [
2144                         'enableSectionEditLinks' => false,
2145                         'wrapperDivClass' => ''
2146                 ] );
2147         }
2148
2149         /**
2150          * Parse wikitext *in the user interface language*, strip
2151          * paragraph wrapper, and return the HTML.
2152          * The result will not be language-converted, as user interface messages
2153          * are already localized into a specific variant.
2154          * Output will be tidy.  Outer paragraph wrapper will only be stripped
2155          * if the result is a single paragraph.
2156          *
2157          * @param string $text Wikitext in the user interface language
2158          * @param bool $linestart Is this the start of a line? (Defaults to true)
2159          * @throws MWException
2160          * @return string HTML
2161          * @since 1.33
2162          */
2163         public function parseInlineAsInterface( $text, $linestart = true ) {
2164                 return Parser::stripOuterParagraph(
2165                         $this->parseAsInterface( $text, $linestart )
2166                 );
2167         }
2168
2169         /**
2170          * Parse wikitext, strip paragraph wrapper, and return the HTML.
2171          *
2172          * @param string $text
2173          * @param bool $linestart Is this the start of a line?
2174          * @param bool $interface Use interface language (instead of content language) while parsing
2175          *   language sensitive magic words like GRAMMAR and PLURAL
2176          * @return string HTML
2177          * @deprecated since 1.33, due to untidy output and confusing default
2178          *   for $interface.  Use parseInlineAsInterface() if $interface is
2179          *   the default value or false, or else use
2180          *   Parser::stripOuterParagraph($outputPage->parseAsContent(...)).
2181          */
2182         public function parseInline( $text, $linestart = true, $interface = false ) {
2183                 $parsed = $this->parseInternal(
2184                         $text, $this->getTitle(), $linestart, /*tidy*/false, $interface, /*language*/null
2185                 )->getText( [
2186                         'enableSectionEditLinks' => false,
2187                         'wrapperDivClass' => '', /* no wrapper div */
2188                 ] );
2189                 return Parser::stripOuterParagraph( $parsed );
2190         }
2191
2192         /**
2193          * Parse wikitext and return the HTML (internal implementation helper)
2194          *
2195          * @param string $text
2196          * @param Title The title to use
2197          * @param bool $linestart Is this the start of a line?
2198          * @param bool $tidy Whether the output should be tidied
2199          * @param bool $interface Use interface language (instead of content language) while parsing
2200          *   language sensitive magic words like GRAMMAR and PLURAL.  This also disables
2201          *   LanguageConverter.
2202          * @param Language|null $language Target language object, will override $interface
2203          * @throws MWException
2204          * @return ParserOutput
2205          */
2206         private function parseInternal( $text, $title, $linestart, $tidy, $interface, $language ) {
2207                 global $wgParser;
2208
2209                 if ( is_null( $title ) ) {
2210                         throw new MWException( 'Empty $mTitle in ' . __METHOD__ );
2211                 }
2212
2213                 $popts = $this->parserOptions();
2214                 $oldTidy = $popts->setTidy( $tidy );
2215                 $oldInterface = $popts->setInterfaceMessage( (bool)$interface );
2216
2217                 if ( $language !== null ) {
2218                         $oldLang = $popts->setTargetLanguage( $language );
2219                 }
2220
2221                 $parserOutput = $wgParser->getFreshParser()->parse(
2222                         $text, $title, $popts,
2223                         $linestart, true, $this->mRevisionId
2224                 );
2225
2226                 $popts->setTidy( $oldTidy );
2227                 $popts->setInterfaceMessage( $oldInterface );
2228
2229                 if ( $language !== null ) {
2230                         $popts->setTargetLanguage( $oldLang );
2231                 }
2232
2233                 return $parserOutput;
2234         }
2235
2236         /**
2237          * Set the value of the "s-maxage" part of the "Cache-control" HTTP header
2238          *
2239          * @param int $maxage Maximum cache time on the CDN, in seconds.
2240          */
2241         public function setCdnMaxage( $maxage ) {
2242                 $this->mCdnMaxage = min( $maxage, $this->mCdnMaxageLimit );
2243         }
2244
2245         /**
2246          * Set the value of the "s-maxage" part of the "Cache-control" HTTP header to $maxage if that is
2247          * lower than the current s-maxage.  Either way, $maxage is now an upper limit on s-maxage, so
2248          * that future calls to setCdnMaxage() will no longer be able to raise the s-maxage above
2249          * $maxage.
2250          *
2251          * @param int $maxage Maximum cache time on the CDN, in seconds
2252          * @since 1.27
2253          */
2254         public function lowerCdnMaxage( $maxage ) {
2255                 $this->mCdnMaxageLimit = min( $maxage, $this->mCdnMaxageLimit );
2256                 $this->setCdnMaxage( $this->mCdnMaxage );
2257         }
2258
2259         /**
2260          * Get TTL in [$minTTL,$maxTTL] in pass it to lowerCdnMaxage()
2261          *
2262          * This sets and returns $minTTL if $mtime is false or null. Otherwise,
2263          * the TTL is higher the older the $mtime timestamp is. Essentially, the
2264          * TTL is 90% of the age of the object, subject to the min and max.
2265          *
2266          * @param string|int|float|bool|null $mtime Last-Modified timestamp
2267          * @param int $minTTL Minimum TTL in seconds [default: 1 minute]
2268          * @param int $maxTTL Maximum TTL in seconds [default: $wgSquidMaxage]
2269          * @since 1.28
2270          */
2271         public function adaptCdnTTL( $mtime, $minTTL = 0, $maxTTL = 0 ) {
2272                 $minTTL = $minTTL ?: IExpiringStore::TTL_MINUTE;
2273                 $maxTTL = $maxTTL ?: $this->getConfig()->get( 'SquidMaxage' );
2274
2275                 if ( $mtime === null || $mtime === false ) {
2276                         return $minTTL; // entity does not exist
2277                 }
2278
2279                 $age = MWTimestamp::time() - wfTimestamp( TS_UNIX, $mtime );
2280                 $adaptiveTTL = max( 0.9 * $age, $minTTL );
2281                 $adaptiveTTL = min( $adaptiveTTL, $maxTTL );
2282
2283                 $this->lowerCdnMaxage( (int)$adaptiveTTL );
2284         }
2285
2286         /**
2287          * Use enableClientCache(false) to force it to send nocache headers
2288          *
2289          * @param bool|null $state New value, or null to not set the value
2290          *
2291          * @return bool Old value
2292          */
2293         public function enableClientCache( $state ) {
2294                 return wfSetVar( $this->mEnableClientCache, $state );
2295         }
2296
2297         /**
2298          * Get the list of cookie names that will influence the cache
2299          *
2300          * @return array
2301          */
2302         function getCacheVaryCookies() {
2303                 if ( self::$cacheVaryCookies === null ) {
2304                         $config = $this->getConfig();
2305                         self::$cacheVaryCookies = array_values( array_unique( array_merge(
2306                                 SessionManager::singleton()->getVaryCookies(),
2307                                 [
2308                                         'forceHTTPS',
2309                                 ],
2310                                 $config->get( 'CacheVaryCookies' )
2311                         ) ) );
2312                         Hooks::run( 'GetCacheVaryCookies', [ $this, &self::$cacheVaryCookies ] );
2313                 }
2314                 return self::$cacheVaryCookies;
2315         }
2316
2317         /**
2318          * Check if the request has a cache-varying cookie header
2319          * If it does, it's very important that we don't allow public caching
2320          *
2321          * @return bool
2322          */
2323         function haveCacheVaryCookies() {
2324                 $request = $this->getRequest();
2325                 foreach ( $this->getCacheVaryCookies() as $cookieName ) {
2326                         if ( $request->getCookie( $cookieName, '', '' ) !== '' ) {
2327                                 wfDebug( __METHOD__ . ": found $cookieName\n" );
2328                                 return true;
2329                         }
2330                 }
2331                 wfDebug( __METHOD__ . ": no cache-varying cookies found\n" );
2332                 return false;
2333         }
2334
2335         /**
2336          * Add an HTTP header that will influence on the cache
2337          *
2338          * @param string $header Header name
2339          * @param string[]|null $option Options for the Key header. See
2340          * https://datatracker.ietf.org/doc/draft-fielding-http-key/
2341          * for the list of valid options.
2342          */
2343         public function addVaryHeader( $header, array $option = null ) {
2344                 if ( !array_key_exists( $header, $this->mVaryHeader ) ) {
2345                         $this->mVaryHeader[$header] = [];
2346                 }
2347                 if ( !is_array( $option ) ) {
2348                         $option = [];
2349                 }
2350                 $this->mVaryHeader[$header] =
2351                         array_unique( array_merge( $this->mVaryHeader[$header], $option ) );
2352         }
2353
2354         /**
2355          * Return a Vary: header on which to vary caches. Based on the keys of $mVaryHeader,
2356          * such as Accept-Encoding or Cookie
2357          *
2358          * @return string
2359          */
2360         public function getVaryHeader() {
2361                 // If we vary on cookies, let's make sure it's always included here too.
2362                 if ( $this->getCacheVaryCookies() ) {
2363                         $this->addVaryHeader( 'Cookie' );
2364                 }
2365
2366                 foreach ( SessionManager::singleton()->getVaryHeaders() as $header => $options ) {
2367                         $this->addVaryHeader( $header, $options );
2368                 }
2369                 return 'Vary: ' . implode( ', ', array_keys( $this->mVaryHeader ) );
2370         }
2371
2372         /**
2373          * Add an HTTP Link: header
2374          *
2375          * @param string $header Header value
2376          */
2377         public function addLinkHeader( $header ) {
2378                 $this->mLinkHeader[] = $header;
2379         }
2380
2381         /**
2382          * Return a Link: header. Based on the values of $mLinkHeader.
2383          *
2384          * @return string
2385          */
2386         public function getLinkHeader() {
2387                 if ( !$this->mLinkHeader ) {
2388                         return false;
2389                 }
2390
2391                 return 'Link: ' . implode( ',', $this->mLinkHeader );
2392         }
2393
2394         /**
2395          * Get a complete Key header
2396          *
2397          * @return string
2398          * @deprecated in 1.32; the IETF spec for this header expired w/o becoming
2399          *   a standard.
2400          */
2401         public function getKeyHeader() {
2402                 wfDeprecated( '$wgUseKeyHeader', '1.32' );
2403
2404                 $cvCookies = $this->getCacheVaryCookies();
2405
2406                 $cookiesOption = [];
2407                 foreach ( $cvCookies as $cookieName ) {
2408                         $cookiesOption[] = 'param=' . $cookieName;
2409                 }
2410                 $this->addVaryHeader( 'Cookie', $cookiesOption );
2411
2412                 foreach ( SessionManager::singleton()->getVaryHeaders() as $header => $options ) {
2413                         $this->addVaryHeader( $header, $options );
2414                 }
2415
2416                 $headers = [];
2417                 foreach ( $this->mVaryHeader as $header => $option ) {
2418                         $newheader = $header;
2419                         if ( is_array( $option ) && count( $option ) > 0 ) {
2420                                 $newheader .= ';' . implode( ';', $option );
2421                         }
2422                         $headers[] = $newheader;
2423                 }
2424                 $key = 'Key: ' . implode( ',', $headers );
2425
2426                 return $key;
2427         }
2428
2429         /**
2430          * T23672: Add Accept-Language to Vary and Key headers if there's no 'variant' parameter in GET.
2431          *
2432          * For example:
2433          *   /w/index.php?title=Main_page will vary based on Accept-Language; but
2434          *   /w/index.php?title=Main_page&variant=zh-cn will not.
2435          */
2436         private function addAcceptLanguage() {
2437                 $title = $this->getTitle();
2438                 if ( !$title instanceof Title ) {
2439                         return;
2440                 }
2441
2442                 $lang = $title->getPageLanguage();
2443                 if ( !$this->getRequest()->getCheck( 'variant' ) && $lang->hasVariants() ) {
2444                         $variants = $lang->getVariants();
2445                         $aloption = [];
2446                         foreach ( $variants as $variant ) {
2447                                 if ( $variant === $lang->getCode() ) {
2448                                         continue;
2449                                 }
2450
2451                                 // XXX Note that this code is not strictly correct: we
2452                                 // do a case-insensitive match in
2453                                 // LanguageConverter::getHeaderVariant() while the
2454                                 // (abandoned, draft) spec for the `Key` header only
2455                                 // allows case-sensitive matches.  To match the logic
2456                                 // in LanguageConverter::getHeaderVariant() we should
2457                                 // also be looking at fallback variants and deprecated
2458                                 // mediawiki-internal codes, as well as BCP 47
2459                                 // normalized forms.
2460
2461                                 $aloption[] = "substr=$variant";
2462
2463                                 // IE and some other browsers use BCP 47 standards in their Accept-Language header,
2464                                 // like "zh-CN" or "zh-Hant".  We should handle these too.
2465                                 $variantBCP47 = LanguageCode::bcp47( $variant );
2466                                 if ( $variantBCP47 !== $variant ) {
2467                                         $aloption[] = "substr=$variantBCP47";
2468                                 }
2469                         }
2470                         $this->addVaryHeader( 'Accept-Language', $aloption );
2471                 }
2472         }
2473
2474         /**
2475          * Set a flag which will cause an X-Frame-Options header appropriate for
2476          * edit pages to be sent. The header value is controlled by
2477          * $wgEditPageFrameOptions.
2478          *
2479          * This is the default for special pages. If you display a CSRF-protected
2480          * form on an ordinary view page, then you need to call this function.
2481          *
2482          * @param bool $enable
2483          */
2484         public function preventClickjacking( $enable = true ) {
2485                 $this->mPreventClickjacking = $enable;
2486         }
2487
2488         /**
2489          * Turn off frame-breaking. Alias for $this->preventClickjacking(false).
2490          * This can be called from pages which do not contain any CSRF-protected
2491          * HTML form.
2492          */
2493         public function allowClickjacking() {
2494                 $this->mPreventClickjacking = false;
2495         }
2496
2497         /**
2498          * Get the prevent-clickjacking flag
2499          *
2500          * @since 1.24
2501          * @return bool
2502          */
2503         public function getPreventClickjacking() {
2504                 return $this->mPreventClickjacking;
2505         }
2506
2507         /**
2508          * Get the X-Frame-Options header value (without the name part), or false
2509          * if there isn't one. This is used by Skin to determine whether to enable
2510          * JavaScript frame-breaking, for clients that don't support X-Frame-Options.
2511          *
2512          * @return string|false
2513          */
2514         public function getFrameOptions() {
2515                 $config = $this->getConfig();
2516                 if ( $config->get( 'BreakFrames' ) ) {
2517                         return 'DENY';
2518                 } elseif ( $this->mPreventClickjacking && $config->get( 'EditPageFrameOptions' ) ) {
2519                         return $config->get( 'EditPageFrameOptions' );
2520                 }
2521                 return false;
2522         }
2523
2524         /**
2525          * Send cache control HTTP headers
2526          */
2527         public function sendCacheControl() {
2528                 $response = $this->getRequest()->response();
2529                 $config = $this->getConfig();
2530
2531                 $this->addVaryHeader( 'Cookie' );
2532                 $this->addAcceptLanguage();
2533
2534                 # don't serve compressed data to clients who can't handle it
2535                 # maintain different caches for logged-in users and non-logged in ones
2536                 $response->header( $this->getVaryHeader() );
2537
2538                 if ( $config->get( 'UseKeyHeader' ) ) {
2539                         $response->header( $this->getKeyHeader() );
2540                 }
2541
2542                 if ( $this->mEnableClientCache ) {
2543                         if (
2544                                 $config->get( 'UseSquid' ) &&
2545                                 !$response->hasCookies() &&
2546                                 !SessionManager::getGlobalSession()->isPersistent() &&
2547                                 !$this->isPrintable() &&
2548                                 $this->mCdnMaxage != 0 &&
2549                                 !$this->haveCacheVaryCookies()
2550                         ) {
2551                                 if ( $config->get( 'UseESI' ) ) {
2552                                         wfDeprecated( '$wgUseESI = true', '1.33' );
2553                                         # We'll purge the proxy cache explicitly, but require end user agents
2554                                         # to revalidate against the proxy on each visit.
2555                                         # Surrogate-Control controls our CDN, Cache-Control downstream caches
2556                                         wfDebug( __METHOD__ .
2557                                                 ": proxy caching with ESI; {$this->mLastModified} **", 'private' );
2558                                         # start with a shorter timeout for initial testing
2559                                         # header( 'Surrogate-Control: max-age=2678400+2678400, content="ESI/1.0"');
2560                                         $response->header(
2561                                                 "Surrogate-Control: max-age={$config->get( 'SquidMaxage' )}" .
2562                                                 "+{$this->mCdnMaxage}, content=\"ESI/1.0\""
2563                                         );
2564                                         $response->header( 'Cache-Control: s-maxage=0, must-revalidate, max-age=0' );
2565                                 } else {
2566                                         # We'll purge the proxy cache for anons explicitly, but require end user agents
2567                                         # to revalidate against the proxy on each visit.
2568                                         # IMPORTANT! The CDN needs to replace the Cache-Control header with
2569                                         # Cache-Control: s-maxage=0, must-revalidate, max-age=0
2570                                         wfDebug( __METHOD__ .
2571                                                 ": local proxy caching; {$this->mLastModified} **", 'private' );
2572                                         # start with a shorter timeout for initial testing
2573                                         # header( "Cache-Control: s-maxage=2678400, must-revalidate, max-age=0" );
2574                                         $response->header( "Cache-Control: " .
2575                                                 "s-maxage={$this->mCdnMaxage}, must-revalidate, max-age=0" );
2576                                 }
2577                         } else {
2578                                 # We do want clients to cache if they can, but they *must* check for updates
2579                                 # on revisiting the page.
2580                                 wfDebug( __METHOD__ . ": private caching; {$this->mLastModified} **", 'private' );
2581                                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
2582                                 $response->header( "Cache-Control: private, must-revalidate, max-age=0" );
2583                         }
2584                         if ( $this->mLastModified ) {
2585                                 $response->header( "Last-Modified: {$this->mLastModified}" );
2586                         }
2587                 } else {
2588                         wfDebug( __METHOD__ . ": no caching **", 'private' );
2589
2590                         # In general, the absence of a last modified header should be enough to prevent
2591                         # the client from using its cache. We send a few other things just to make sure.
2592                         $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
2593                         $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
2594                         $response->header( 'Pragma: no-cache' );
2595                 }
2596         }
2597
2598         /**
2599          * Transfer styles and JavaScript modules from skin.
2600          *
2601          * @param Skin $sk to load modules for
2602          */
2603         public function loadSkinModules( $sk ) {
2604                 foreach ( $sk->getDefaultModules() as $group => $modules ) {
2605                         if ( $group === 'styles' ) {
2606                                 foreach ( $modules as $key => $moduleMembers ) {
2607                                         $this->addModuleStyles( $moduleMembers );
2608                                 }
2609                         } else {
2610                                 $this->addModules( $modules );
2611                         }
2612                 }
2613         }
2614
2615         /**
2616          * Finally, all the text has been munged and accumulated into
2617          * the object, let's actually output it:
2618          *
2619          * @param bool $return Set to true to get the result as a string rather than sending it
2620          * @return string|null
2621          * @throws Exception
2622          * @throws FatalError
2623          * @throws MWException
2624          */
2625         public function output( $return = false ) {
2626                 if ( $this->mDoNothing ) {
2627                         return $return ? '' : null;
2628                 }
2629
2630                 $response = $this->getRequest()->response();
2631                 $config = $this->getConfig();
2632
2633                 if ( $this->mRedirect != '' ) {
2634                         # Standards require redirect URLs to be absolute
2635                         $this->mRedirect = wfExpandUrl( $this->mRedirect, PROTO_CURRENT );
2636
2637                         $redirect = $this->mRedirect;
2638                         $code = $this->mRedirectCode;
2639
2640                         if ( Hooks::run( "BeforePageRedirect", [ $this, &$redirect, &$code ] ) ) {
2641                                 if ( $code == '301' || $code == '303' ) {
2642                                         if ( !$config->get( 'DebugRedirects' ) ) {
2643                                                 $response->statusHeader( $code );
2644                                         }
2645                                         $this->mLastModified = wfTimestamp( TS_RFC2822 );
2646                                 }
2647                                 if ( $config->get( 'VaryOnXFP' ) ) {
2648                                         $this->addVaryHeader( 'X-Forwarded-Proto' );
2649                                 }
2650                                 $this->sendCacheControl();
2651
2652                                 $response->header( "Content-Type: text/html; charset=utf-8" );
2653                                 if ( $config->get( 'DebugRedirects' ) ) {
2654                                         $url = htmlspecialchars( $redirect );
2655                                         print "<!DOCTYPE html>\n<html>\n<head>\n<title>Redirect</title>\n</head>\n<body>\n";
2656                                         print "<p>Location: <a href=\"$url\">$url</a></p>\n";
2657                                         print "</body>\n</html>\n";
2658                                 } else {
2659                                         $response->header( 'Location: ' . $redirect );
2660                                 }
2661                         }
2662
2663                         return $return ? '' : null;
2664                 } elseif ( $this->mStatusCode ) {
2665                         $response->statusHeader( $this->mStatusCode );
2666                 }
2667
2668                 # Buffer output; final headers may depend on later processing
2669                 ob_start();
2670
2671                 $response->header( 'Content-type: ' . $config->get( 'MimeType' ) . '; charset=UTF-8' );
2672                 $response->header( 'Content-language: ' .
2673                         MediaWikiServices::getInstance()->getContentLanguage()->getHtmlCode() );
2674
2675                 if ( !$this->mArticleBodyOnly ) {
2676                         $sk = $this->getSkin();
2677                 }
2678
2679                 $linkHeader = $this->getLinkHeader();
2680                 if ( $linkHeader ) {
2681                         $response->header( $linkHeader );
2682                 }
2683
2684                 // Prevent framing, if requested
2685                 $frameOptions = $this->getFrameOptions();
2686                 if ( $frameOptions ) {
2687                         $response->header( "X-Frame-Options: $frameOptions" );
2688                 }
2689
2690                 ContentSecurityPolicy::sendHeaders( $this );
2691
2692                 if ( $this->mArticleBodyOnly ) {
2693                         echo $this->mBodytext;
2694                 } else {
2695                         // Enable safe mode if requested (T152169)
2696                         if ( $this->getRequest()->getBool( 'safemode' ) ) {
2697                                 $this->disallowUserJs();
2698                         }
2699
2700                         $sk = $this->getSkin();
2701                         $this->loadSkinModules( $sk );
2702
2703                         MWDebug::addModules( $this );
2704
2705                         // Avoid PHP 7.1 warning of passing $this by reference
2706                         $outputPage = $this;
2707                         // Hook that allows last minute changes to the output page, e.g.
2708                         // adding of CSS or Javascript by extensions.
2709                         Hooks::runWithoutAbort( 'BeforePageDisplay', [ &$outputPage, &$sk ] );
2710
2711                         try {
2712                                 $sk->outputPage();
2713                         } catch ( Exception $e ) {
2714                                 ob_end_clean(); // bug T129657
2715                                 throw $e;
2716                         }
2717                 }
2718
2719                 try {
2720                         // This hook allows last minute changes to final overall output by modifying output buffer
2721                         Hooks::runWithoutAbort( 'AfterFinalPageOutput', [ $this ] );
2722                 } catch ( Exception $e ) {
2723                         ob_end_clean(); // bug T129657
2724                         throw $e;
2725                 }
2726
2727                 $this->sendCacheControl();
2728
2729                 if ( $return ) {
2730                         return ob_get_clean();
2731                 } else {
2732                         ob_end_flush();
2733                         return null;
2734                 }
2735         }
2736
2737         /**
2738          * Prepare this object to display an error page; disable caching and
2739          * indexing, clear the current text and redirect, set the page's title
2740          * and optionally an custom HTML title (content of the "<title>" tag).
2741          *
2742          * @param string|Message $pageTitle Will be passed directly to setPageTitle()
2743          * @param string|Message $htmlTitle Will be passed directly to setHTMLTitle();
2744          *                   optional, if not passed the "<title>" attribute will be
2745          *                   based on $pageTitle
2746          */
2747         public function prepareErrorPage( $pageTitle, $htmlTitle = false ) {
2748                 $this->setPageTitle( $pageTitle );
2749                 if ( $htmlTitle !== false ) {
2750                         $this->setHTMLTitle( $htmlTitle );
2751                 }
2752                 $this->setRobotPolicy( 'noindex,nofollow' );
2753                 $this->setArticleRelated( false );
2754                 $this->enableClientCache( false );
2755                 $this->mRedirect = '';
2756                 $this->clearSubtitle();
2757                 $this->clearHTML();
2758         }
2759
2760         /**
2761          * Output a standard error page
2762          *
2763          * showErrorPage( 'titlemsg', 'pagetextmsg' );
2764          * showErrorPage( 'titlemsg', 'pagetextmsg', [ 'param1', 'param2' ] );
2765          * showErrorPage( 'titlemsg', $messageObject );
2766          * showErrorPage( $titleMessageObject, $messageObject );
2767          *
2768          * @param string|Message $title Message key (string) for page title, or a Message object
2769          * @param string|Message $msg Message key (string) for page text, or a Message object
2770          * @param array $params Message parameters; ignored if $msg is a Message object
2771          */
2772         public function showErrorPage( $title, $msg, $params = [] ) {
2773                 if ( !$title instanceof Message ) {
2774                         $title = $this->msg( $title );
2775                 }
2776
2777                 $this->prepareErrorPage( $title );
2778
2779                 if ( $msg instanceof Message ) {
2780                         if ( $params !== [] ) {
2781                                 trigger_error( 'Argument ignored: $params. The message parameters argument '
2782                                         . 'is discarded when the $msg argument is a Message object instead of '
2783                                         . 'a string.', E_USER_NOTICE );
2784                         }
2785                         $this->addHTML( $msg->parseAsBlock() );
2786                 } else {
2787                         $this->addWikiMsgArray( $msg, $params );
2788                 }
2789
2790                 $this->returnToMain();
2791         }
2792
2793         /**
2794          * Output a standard permission error page
2795          *
2796          * @param array $errors Error message keys or [key, param...] arrays
2797          * @param string|null $action Action that was denied or null if unknown
2798          */
2799         public function showPermissionsErrorPage( array $errors, $action = null ) {
2800                 foreach ( $errors as $key => $error ) {
2801                         $errors[$key] = (array)$error;
2802                 }
2803
2804                 // For some action (read, edit, create and upload), display a "login to do this action"
2805                 // error if all of the following conditions are met:
2806                 // 1. the user is not logged in
2807                 // 2. the only error is insufficient permissions (i.e. no block or something else)
2808                 // 3. the error can be avoided simply by logging in
2809                 if ( in_array( $action, [ 'read', 'edit', 'createpage', 'createtalk', 'upload' ] )
2810                         && $this->getUser()->isAnon() && count( $errors ) == 1 && isset( $errors[0][0] )
2811                         && ( $errors[0][0] == 'badaccess-groups' || $errors[0][0] == 'badaccess-group0' )
2812                         && ( User::groupHasPermission( 'user', $action )
2813                         || User::groupHasPermission( 'autoconfirmed', $action ) )
2814                 ) {
2815                         $displayReturnto = null;
2816
2817                         # Due to T34276, if a user does not have read permissions,
2818                         # $this->getTitle() will just give Special:Badtitle, which is
2819                         # not especially useful as a returnto parameter. Use the title
2820                         # from the request instead, if there was one.
2821                         $request = $this->getRequest();
2822                         $returnto = Title::newFromText( $request->getVal( 'title', '' ) );
2823                         if ( $action == 'edit' ) {
2824                                 $msg = 'whitelistedittext';
2825                                 $displayReturnto = $returnto;
2826                         } elseif ( $action == 'createpage' || $action == 'createtalk' ) {
2827                                 $msg = 'nocreatetext';
2828                         } elseif ( $action == 'upload' ) {
2829                                 $msg = 'uploadnologintext';
2830                         } else { # Read
2831                                 $msg = 'loginreqpagetext';
2832                                 $displayReturnto = Title::newMainPage();
2833                         }
2834
2835                         $query = [];
2836
2837                         if ( $returnto ) {
2838                                 $query['returnto'] = $returnto->getPrefixedText();
2839
2840                                 if ( !$request->wasPosted() ) {
2841                                         $returntoquery = $request->getValues();
2842                                         unset( $returntoquery['title'] );
2843                                         unset( $returntoquery['returnto'] );
2844                                         unset( $returntoquery['returntoquery'] );
2845                                         $query['returntoquery'] = wfArrayToCgi( $returntoquery );
2846                                 }
2847                         }
2848                         $linkRenderer = MediaWikiServices::getInstance()->getLinkRenderer();
2849                         $loginLink = $linkRenderer->makeKnownLink(
2850                                 SpecialPage::getTitleFor( 'Userlogin' ),
2851                                 $this->msg( 'loginreqlink' )->text(),
2852                                 [],
2853                                 $query
2854                         );
2855
2856                         $this->prepareErrorPage( $this->msg( 'loginreqtitle' ) );
2857                         $this->addHTML( $this->msg( $msg )->rawParams( $loginLink )->parse() );
2858
2859                         # Don't return to a page the user can't read otherwise
2860                         # we'll end up in a pointless loop
2861                         if ( $displayReturnto && $displayReturnto->userCan( 'read', $this->getUser() ) ) {
2862                                 $this->returnToMain( null, $displayReturnto );
2863                         }
2864                 } else {
2865                         $this->prepareErrorPage( $this->msg( 'permissionserrors' ) );
2866                         $this->addWikiTextAsInterface( $this->formatPermissionsErrorMessage( $errors, $action ) );
2867                 }
2868         }
2869
2870         /**
2871          * Display an error page indicating that a given version of MediaWiki is
2872          * required to use it
2873          *
2874          * @param mixed $version The version of MediaWiki needed to use the page
2875          */
2876         public function versionRequired( $version ) {
2877                 $this->prepareErrorPage( $this->msg( 'versionrequired', $version ) );
2878
2879                 $this->addWikiMsg( 'versionrequiredtext', $version );
2880                 $this->returnToMain();
2881         }
2882
2883         /**
2884          * Format a list of error messages
2885          *
2886          * @param array $errors Array of arrays returned by Title::getUserPermissionsErrors
2887          * @param string|null $action Action that was denied or null if unknown
2888          * @return string The wikitext error-messages, formatted into a list.
2889          */
2890         public function formatPermissionsErrorMessage( array $errors, $action = null ) {
2891                 if ( $action == null ) {
2892                         $text = $this->msg( 'permissionserrorstext', count( $errors ) )->plain() . "\n\n";
2893                 } else {
2894                         $action_desc = $this->msg( "action-$action" )->plain();
2895                         $text = $this->msg(
2896                                 'permissionserrorstext-withaction',
2897                                 count( $errors ),
2898                                 $action_desc
2899                         )->plain() . "\n\n";
2900                 }
2901
2902                 if ( count( $errors ) > 1 ) {
2903                         $text .= '<ul class="permissions-errors">' . "\n";
2904
2905                         foreach ( $errors as $error ) {
2906                                 $text .= '<li>';
2907                                 $text .= $this->msg( ...$error )->plain();
2908                                 $text .= "</li>\n";
2909                         }
2910                         $text .= '</ul>';
2911                 } else {
2912                         $text .= "<div class=\"permissions-errors\">\n" .
2913                                         $this->msg( ...reset( $errors ) )->plain() .
2914                                         "\n</div>";
2915                 }
2916
2917                 return $text;
2918         }
2919
2920         /**
2921          * Show a warning about replica DB lag
2922          *
2923          * If the lag is higher than $wgSlaveLagCritical seconds,
2924          * then the warning is a bit more obvious. If the lag is
2925          * lower than $wgSlaveLagWarning, then no warning is shown.
2926          *
2927          * @param int $lag Slave lag
2928          */
2929         public function showLagWarning( $lag ) {
2930                 $config = $this->getConfig();
2931                 if ( $lag >= $config->get( 'SlaveLagWarning' ) ) {
2932                         $lag = floor( $lag ); // floor to avoid nano seconds to display
2933                         $message = $lag < $config->get( 'SlaveLagCritical' )
2934                                 ? 'lag-warn-normal'
2935                                 : 'lag-warn-high';
2936                         $wrap = Html::rawElement( 'div', [ 'class' => "mw-{$message}" ], "\n$1\n" );
2937                         $this->wrapWikiMsg( "$wrap\n", [ $message, $this->getLanguage()->formatNum( $lag ) ] );
2938                 }
2939         }
2940
2941         /**
2942          * Output an error page
2943          *
2944          * @note FatalError exception class provides an alternative.
2945          * @param string $message Error to output. Must be escaped for HTML.
2946          */
2947         public function showFatalError( $message ) {
2948                 $this->prepareErrorPage( $this->msg( 'internalerror' ) );
2949
2950                 $this->addHTML( $message );
2951         }
2952
2953         /**
2954          * @deprecated 1.32 Use OutputPage::showFatalError or throw FatalError instead.
2955          */
2956         public function showUnexpectedValueError( $name, $val ) {
2957                 wfDeprecated( __METHOD__, '1.32' );
2958                 $this->showFatalError( $this->msg( 'unexpected', $name, $val )->escaped() );
2959         }
2960
2961         /**
2962          * @deprecated 1.32 Use OutputPage::showFatalError or throw FatalError instead.
2963          */
2964         public function showFileCopyError( $old, $new ) {
2965                 wfDeprecated( __METHOD__, '1.32' );
2966                 $this->showFatalError( $this->msg( 'filecopyerror', $old, $new )->escaped() );
2967         }
2968
2969         /**
2970          * @deprecated 1.32 Use OutputPage::showFatalError or throw FatalError instead.
2971          */
2972         public function showFileRenameError( $old, $new ) {
2973                 wfDeprecated( __METHOD__, '1.32' );
2974                 $this->showFatalError( $this->msg( 'filerenameerror', $old, $new )->escpaed() );
2975         }
2976
2977         /**
2978          * @deprecated 1.32 Use OutputPage::showFatalError or throw FatalError instead.
2979          */
2980         public function showFileDeleteError( $name ) {
2981                 wfDeprecated( __METHOD__, '1.32' );
2982                 $this->showFatalError( $this->msg( 'filedeleteerror', $name )->escaped() );
2983         }
2984
2985         /**
2986          * @deprecated 1.32 Use OutputPage::showFatalError or throw FatalError instead.
2987          */
2988         public function showFileNotFoundError( $name ) {
2989                 wfDeprecated( __METHOD__, '1.32' );
2990                 $this->showFatalError( $this->msg( 'filenotfound', $name )->escaped() );
2991         }
2992
2993         /**
2994          * Add a "return to" link pointing to a specified title
2995          *
2996          * @param Title $title Title to link
2997          * @param array $query Query string parameters
2998          * @param string|null $text Text of the link (input is not escaped)
2999          * @param array $options Options array to pass to Linker
3000          */
3001         public function addReturnTo( $title, array $query = [], $text = null, $options = [] ) {
3002                 $linkRenderer = MediaWikiServices::getInstance()
3003                         ->getLinkRendererFactory()->createFromLegacyOptions( $options );
3004                 $link = $this->msg( 'returnto' )->rawParams(
3005                         $linkRenderer->makeLink( $title, $text, [], $query ) )->escaped();
3006                 $this->addHTML( "<p id=\"mw-returnto\">{$link}</p>\n" );
3007         }
3008
3009         /**
3010          * Add a "return to" link pointing to a specified title,
3011          * or the title indicated in the request, or else the main page
3012          *
3013          * @param mixed|null $unused
3014          * @param Title|string|null $returnto Title or String to return to
3015          * @param string|null $returntoquery Query string for the return to link
3016          */
3017         public function returnToMain( $unused = null, $returnto = null, $returntoquery = null ) {
3018                 if ( $returnto == null ) {
3019                         $returnto = $this->getRequest()->getText( 'returnto' );
3020                 }
3021
3022                 if ( $returntoquery == null ) {
3023                         $returntoquery = $this->getRequest()->getText( 'returntoquery' );
3024                 }
3025
3026                 if ( $returnto === '' ) {
3027                         $returnto = Title::newMainPage();
3028                 }
3029
3030                 if ( is_object( $returnto ) ) {
3031                         $titleObj = $returnto;
3032                 } else {
3033                         $titleObj = Title::newFromText( $returnto );
3034                 }
3035                 // We don't want people to return to external interwiki. That
3036                 // might potentially be used as part of a phishing scheme
3037                 if ( !is_object( $titleObj ) || $titleObj->isExternal() ) {
3038                         $titleObj = Title::newMainPage();
3039                 }
3040
3041                 $this->addReturnTo( $titleObj, wfCgiToArray( $returntoquery ) );
3042         }
3043
3044         private function getRlClientContext() {
3045                 if ( !$this->rlClientContext ) {
3046                         $query = ResourceLoader::makeLoaderQuery(
3047                                 [], // modules; not relevant
3048                                 $this->getLanguage()->getCode(),
3049                                 $this->getSkin()->getSkinName(),
3050                                 $this->getUser()->isLoggedIn() ? $this->getUser()->getName() : null,
3051                                 null, // version; not relevant
3052                                 ResourceLoader::inDebugMode(),
3053                                 null, // only; not relevant
3054                                 $this->isPrintable(),
3055                                 $this->getRequest()->getBool( 'handheld' )
3056                         );
3057                         $this->rlClientContext = new ResourceLoaderContext(
3058                                 $this->getResourceLoader(),
3059                                 new FauxRequest( $query )
3060                         );
3061                         if ( $this->contentOverrideCallbacks ) {
3062                                 $this->rlClientContext = new DerivativeResourceLoaderContext( $this->rlClientContext );
3063                                 $this->rlClientContext->setContentOverrideCallback( function ( Title $title ) {
3064                                         foreach ( $this->contentOverrideCallbacks as $callback ) {
3065                                                 $content = $callback( $title );
3066                                                 if ( $content !== null ) {
3067                                                         $text = ContentHandler::getContentText( $content );
3068                                                         if ( strpos( $text, '</script>' ) !== false ) {
3069                                                                 // Proactively replace this so that we can display a message
3070                                                                 // to the user, instead of letting it go to Html::inlineScript(),
3071                                                                 // where it would be considered a server-side issue.
3072                                                                 $titleFormatted = $title->getPrefixedText();
3073                                                                 $content = new JavaScriptContent(
3074                                                                         Xml::encodeJsCall( 'mw.log.error', [
3075                                                                                 "Cannot preview $titleFormatted due to script-closing tag."
3076                                                                         ] )
3077                                                                 );
3078                                                         }
3079                                                         return $content;
3080                                                 }
3081                                         }
3082                                         return null;
3083                                 } );
3084                         }
3085                 }
3086                 return $this->rlClientContext;
3087         }
3088
3089         /**
3090          * Call this to freeze the module queue and JS config and create a formatter.
3091          *
3092          * Depending on the Skin, this may get lazy-initialised in either headElement() or
3093          * getBottomScripts(). See SkinTemplate::prepareQuickTemplate(). Calling this too early may
3094          * cause unexpected side-effects since disallowUserJs() may be called at any time to change
3095          * the module filters retroactively. Skins and extension hooks may also add modules until very
3096          * late in the request lifecycle.
3097          *
3098          * @return ResourceLoaderClientHtml
3099          */
3100         public function getRlClient() {
3101                 if ( !$this->rlClient ) {
3102                         $context = $this->getRlClientContext();
3103                         $rl = $this->getResourceLoader();
3104                         $this->addModules( [
3105                                 'user',
3106                                 'user.options',
3107                                 'user.tokens',
3108                         ] );
3109                         $this->addModuleStyles( [
3110                                 'site.styles',
3111                                 'noscript',
3112                                 'user.styles',
3113                         ] );
3114                         $this->getSkin()->setupSkinUserCss( $this );
3115
3116                         // Prepare exempt modules for buildExemptModules()
3117                         $exemptGroups = [ 'site' => [], 'noscript' => [], 'private' => [], 'user' => [] ];
3118                         $exemptStates = [];
3119                         $moduleStyles = $this->getModuleStyles( /*filter*/ true );
3120
3121                         // Preload getTitleInfo for isKnownEmpty calls below and in ResourceLoaderClientHtml
3122                         // Separate user-specific batch for improved cache-hit ratio.
3123                         $userBatch = [ 'user.styles', 'user' ];
3124                         $siteBatch = array_diff( $moduleStyles, $userBatch );
3125                         $dbr = wfGetDB( DB_REPLICA );
3126                         ResourceLoaderWikiModule::preloadTitleInfo( $context, $dbr, $siteBatch );
3127                         ResourceLoaderWikiModule::preloadTitleInfo( $context, $dbr, $userBatch );
3128
3129                         // Filter out modules handled by buildExemptModules()
3130                         $moduleStyles = array_filter( $moduleStyles,
3131                                 function ( $name ) use ( $rl, $context, &$exemptGroups, &$exemptStates ) {
3132                                         $module = $rl->getModule( $name );
3133                                         if ( $module ) {
3134                                                 $group = $module->getGroup();
3135                                                 if ( isset( $exemptGroups[$group] ) ) {
3136                                                         $exemptStates[$name] = 'ready';
3137                                                         if ( !$module->isKnownEmpty( $context ) ) {
3138                                                                 // E.g. Don't output empty <styles>
3139                                                                 $exemptGroups[$group][] = $name;
3140                                                         }
3141                                                         return false;
3142                                                 }
3143                                         }
3144                                         return true;
3145                                 }
3146                         );
3147                         $this->rlExemptStyleModules = $exemptGroups;
3148
3149                         $rlClient = new ResourceLoaderClientHtml( $context, [
3150                                 'target' => $this->getTarget(),
3151                                 'nonce' => $this->getCSPNonce(),
3152                                 // When 'safemode', disallowUserJs(), or reduceAllowedModules() is used
3153                                 // to only restrict modules to ORIGIN_CORE (ie. disallow ORIGIN_USER), the list of
3154                                 // modules enqueud for loading on this page is filtered to just those.
3155                                 // However, to make sure we also apply the restriction to dynamic dependencies and
3156                                 // lazy-loaded modules at run-time on the client-side, pass 'safemode' down to the
3157                                 // StartupModule so that the client-side registry will not contain any restricted
3158                                 // modules either. (T152169, T185303)
3159                                 'safemode' => ( $this->getAllowedModules( ResourceLoaderModule::TYPE_COMBINED )
3160                                         <= ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL
3161                                 ) ? '1' : null,
3162                         ] );
3163                         $rlClient->setConfig( $this->getJSVars() );
3164                         $rlClient->setModules( $this->getModules( /*filter*/ true ) );
3165                         $rlClient->setModuleStyles( $moduleStyles );
3166                         $rlClient->setModuleScripts( $this->getModuleScripts( /*filter*/ true ) );
3167                         $rlClient->setExemptStates( $exemptStates );
3168                         $this->rlClient = $rlClient;
3169                 }
3170                 return $this->rlClient;
3171         }
3172
3173         /**
3174          * @param Skin $sk The given Skin
3175          * @param bool $includeStyle Unused
3176          * @return string The doctype, opening "<html>", and head element.
3177          */
3178         public function headElement( Skin $sk, $includeStyle = true ) {
3179                 $userdir = $this->getLanguage()->getDir();
3180                 $sitedir = MediaWikiServices::getInstance()->getContentLanguage()->getDir();
3181
3182                 $pieces = [];
3183                 $pieces[] = Html::htmlHeader( Sanitizer::mergeAttributes(
3184                         $this->getRlClient()->getDocumentAttributes(),
3185                         $sk->getHtmlElementAttributes()
3186                 ) );
3187                 $pieces[] = Html::openElement( 'head' );
3188
3189                 if ( $this->getHTMLTitle() == '' ) {
3190                         $this->setHTMLTitle( $this->msg( 'pagetitle', $this->getPageTitle() )->inContentLanguage() );
3191                 }
3192
3193                 if ( !Html::isXmlMimeType( $this->getConfig()->get( 'MimeType' ) ) ) {
3194                         // Add <meta charset="UTF-8">
3195                         // This should be before <title> since it defines the charset used by
3196                         // text including the text inside <title>.
3197                         // The spec recommends defining XHTML5's charset using the XML declaration
3198                         // instead of meta.
3199                         // Our XML declaration is output by Html::htmlHeader.
3200                         // https://html.spec.whatwg.org/multipage/semantics.html#attr-meta-http-equiv-content-type
3201                         // https://html.spec.whatwg.org/multipage/semantics.html#charset
3202                         $pieces[] = Html::element( 'meta', [ 'charset' => 'UTF-8' ] );
3203                 }
3204
3205                 $pieces[] = Html::element( 'title', null, $this->getHTMLTitle() );
3206                 $pieces[] = $this->getRlClient()->getHeadHtml();
3207                 $pieces[] = $this->buildExemptModules();
3208                 $pieces = array_merge( $pieces, array_values( $this->getHeadLinksArray() ) );
3209                 $pieces = array_merge( $pieces, array_values( $this->mHeadItems ) );
3210
3211                 // Use an IE conditional comment to serve the script only to old IE
3212                 $pieces[] = '<!--[if lt IE 9]>' .
3213                         ResourceLoaderClientHtml::makeLoad(
3214                                 ResourceLoaderContext::newDummyContext(),
3215                                 [ 'html5shiv' ],
3216                                 ResourceLoaderModule::TYPE_SCRIPTS,
3217                                 [ 'sync' => true ],
3218                                 $this->getCSPNonce()
3219                         ) .
3220                         '<![endif]-->';
3221
3222                 $pieces[] = Html::closeElement( 'head' );
3223
3224                 $bodyClasses = $this->mAdditionalBodyClasses;
3225                 $bodyClasses[] = 'mediawiki';
3226
3227                 # Classes for LTR/RTL directionality support
3228                 $bodyClasses[] = $userdir;
3229                 $bodyClasses[] = "sitedir-$sitedir";
3230
3231                 $underline = $this->getUser()->getOption( 'underline' );
3232                 if ( $underline < 2 ) {
3233                         // The following classes can be used here:
3234                         // * mw-underline-always
3235                         // * mw-underline-never
3236                         $bodyClasses[] = 'mw-underline-' . ( $underline ? 'always' : 'never' );
3237                 }
3238
3239                 if ( $this->getLanguage()->capitalizeAllNouns() ) {
3240                         # A <body> class is probably not the best way to do this . . .
3241                         $bodyClasses[] = 'capitalize-all-nouns';
3242                 }
3243
3244                 // Parser feature migration class
3245                 // The idea is that this will eventually be removed, after the wikitext
3246                 // which requires it is cleaned up.
3247                 $bodyClasses[] = 'mw-hide-empty-elt';
3248
3249                 $bodyClasses[] = $sk->getPageClasses( $this->getTitle() );
3250                 $bodyClasses[] = 'skin-' . Sanitizer::escapeClass( $sk->getSkinName() );
3251                 $bodyClasses[] =
3252                         'action-' . Sanitizer::escapeClass( Action::getActionName( $this->getContext() ) );
3253
3254                 $bodyAttrs = [];
3255                 // While the implode() is not strictly needed, it's used for backwards compatibility
3256                 // (this used to be built as a string and hooks likely still expect that).
3257                 $bodyAttrs['class'] = implode( ' ', $bodyClasses );
3258
3259                 // Allow skins and extensions to add body attributes they need
3260                 $sk->addToBodyAttributes( $this, $bodyAttrs );
3261                 Hooks::run( 'OutputPageBodyAttributes', [ $this, $sk, &$bodyAttrs ] );
3262
3263                 $pieces[] = Html::openElement( 'body', $bodyAttrs );
3264
3265                 return self::combineWrappedStrings( $pieces );
3266         }
3267
3268         /**
3269          * Get a ResourceLoader object associated with this OutputPage
3270          *
3271          * @return ResourceLoader
3272          */
3273         public function getResourceLoader() {
3274                 if ( is_null( $this->mResourceLoader ) ) {
3275                         $this->mResourceLoader = new ResourceLoader(
3276                                 $this->getConfig(),
3277                                 LoggerFactory::getInstance( 'resourceloader' )
3278                         );
3279                 }
3280                 return $this->mResourceLoader;
3281         }
3282
3283         /**
3284          * Explicily load or embed modules on a page.
3285          *
3286          * @param array|string $modules One or more module names
3287          * @param string $only ResourceLoaderModule TYPE_ class constant
3288          * @param array $extraQuery [optional] Array with extra query parameters for the request
3289          * @return string|WrappedStringList HTML
3290          */
3291         public function makeResourceLoaderLink( $modules, $only, array $extraQuery = [] ) {
3292                 // Apply 'target' and 'origin' filters
3293                 $modules = $this->filterModules( (array)$modules, null, $only );
3294
3295                 return ResourceLoaderClientHtml::makeLoad(
3296                         $this->getRlClientContext(),
3297                         $modules,
3298                         $only,
3299                         $extraQuery,
3300                         $this->getCSPNonce()
3301                 );
3302         }
3303
3304         /**
3305          * Combine WrappedString chunks and filter out empty ones
3306          *
3307          * @param array $chunks
3308          * @return string|WrappedStringList HTML
3309          */
3310         protected static function combineWrappedStrings( array $chunks ) {
3311                 // Filter out empty values
3312                 $chunks = array_filter( $chunks, 'strlen' );
3313                 return WrappedString::join( "\n", $chunks );
3314         }
3315
3316         /**
3317          * JS stuff to put at the bottom of the `<body>`.
3318          * These are legacy scripts ($this->mScripts), and user JS.
3319          *
3320          * @return string|WrappedStringList HTML
3321          */
3322         public function getBottomScripts() {
3323                 $chunks = [];
3324                 $chunks[] = $this->getRlClient()->getBodyHtml();
3325
3326                 // Legacy non-ResourceLoader scripts
3327                 $chunks[] = $this->mScripts;
3328
3329                 if ( $this->limitReportJSData ) {
3330                         $chunks[] = ResourceLoader::makeInlineScript(
3331                                 ResourceLoader::makeConfigSetScript(
3332                                         [ 'wgPageParseReport' => $this->limitReportJSData ]
3333                                 ),
3334                                 $this->getCSPNonce()
3335                         );
3336                 }
3337
3338                 return self::combineWrappedStrings( $chunks );
3339         }
3340
3341         /**
3342          * Get the javascript config vars to include on this page
3343          *
3344          * @return array Array of javascript config vars
3345          * @since 1.23
3346          */
3347         public function getJsConfigVars() {
3348                 return $this->mJsConfigVars;
3349         }
3350
3351         /**
3352          * Add one or more variables to be set in mw.config in JavaScript
3353          *
3354          * @param string|array $keys Key or array of key/value pairs
3355          * @param mixed|null $value [optional] Value of the configuration variable
3356          */
3357         public function addJsConfigVars( $keys, $value = null ) {
3358                 if ( is_array( $keys ) ) {
3359                         foreach ( $keys as $key => $value ) {
3360                                 $this->mJsConfigVars[$key] = $value;
3361                         }
3362                         return;
3363                 }
3364
3365                 $this->mJsConfigVars[$keys] = $value;
3366         }
3367
3368         /**
3369          * Get an array containing the variables to be set in mw.config in JavaScript.
3370          *
3371          * Do not add things here which can be evaluated in ResourceLoaderStartUpModule
3372          * - in other words, page-independent/site-wide variables (without state).
3373          * You will only be adding bloat to the html page and causing page caches to
3374          * have to be purged on configuration changes.
3375          * @return array
3376          */
3377         public function getJSVars() {
3378                 $curRevisionId = 0;
3379                 $articleId = 0;
3380                 $canonicalSpecialPageName = false; # T23115
3381                 $services = MediaWikiServices::getInstance();
3382
3383                 $title = $this->getTitle();
3384                 $ns = $title->getNamespace();
3385                 $canonicalNamespace = MWNamespace::exists( $ns )
3386                         ? MWNamespace::getCanonicalName( $ns )
3387                         : $title->getNsText();
3388
3389                 $sk = $this->getSkin();
3390                 // Get the relevant title so that AJAX features can use the correct page name
3391                 // when making API requests from certain special pages (T36972).
3392                 $relevantTitle = $sk->getRelevantTitle();
3393                 $relevantUser = $sk->getRelevantUser();
3394
3395                 if ( $ns == NS_SPECIAL ) {
3396                         list( $canonicalSpecialPageName, /*...*/ ) =
3397                                 $services->getSpecialPageFactory()->
3398                                         resolveAlias( $title->getDBkey() );
3399                 } elseif ( $this->canUseWikiPage() ) {
3400                         $wikiPage = $this->getWikiPage();
3401                         $curRevisionId = $wikiPage->getLatest();
3402                         $articleId = $wikiPage->getId();
3403                 }
3404
3405                 $lang = $title->getPageViewLanguage();
3406
3407                 // Pre-process information
3408                 $separatorTransTable = $lang->separatorTransformTable();
3409                 $separatorTransTable = $separatorTransTable ?: [];
3410                 $compactSeparatorTransTable = [
3411                         implode( "\t", array_keys( $separatorTransTable ) ),
3412                         implode( "\t", $separatorTransTable ),
3413                 ];
3414                 $digitTransTable = $lang->digitTransformTable();
3415                 $digitTransTable = $digitTransTable ?: [];
3416                 $compactDigitTransTable = [
3417                         implode( "\t", array_keys( $digitTransTable ) ),
3418                         implode( "\t", $digitTransTable ),
3419                 ];
3420
3421                 $user = $this->getUser();
3422
3423                 $vars = [
3424                         'wgCanonicalNamespace' => $canonicalNamespace,
3425                         'wgCanonicalSpecialPageName' => $canonicalSpecialPageName,
3426                         'wgNamespaceNumber' => $title->getNamespace(),
3427                         'wgPageName' => $title->getPrefixedDBkey(),
3428                         'wgTitle' => $title->getText(),
3429                         'wgCurRevisionId' => $curRevisionId,
3430                         'wgRevisionId' => (int)$this->getRevisionId(),
3431                         'wgArticleId' => $articleId,
3432                         'wgIsArticle' => $this->isArticle(),
3433                         'wgIsRedirect' => $title->isRedirect(),
3434                         'wgAction' => Action::getActionName( $this->getContext() ),
3435                         'wgUserName' => $user->isAnon() ? null : $user->getName(),
3436                         'wgUserGroups' => $user->getEffectiveGroups(),
3437                         'wgCategories' => $this->getCategories(),
3438                         'wgBreakFrames' => $this->getFrameOptions() == 'DENY',
3439                         'wgPageContentLanguage' => $lang->getCode(),
3440                         'wgPageContentModel' => $title->getContentModel(),
3441                         'wgSeparatorTransformTable' => $compactSeparatorTransTable,
3442                         'wgDigitTransformTable' => $compactDigitTransTable,
3443                         'wgDefaultDateFormat' => $lang->getDefaultDateFormat(),
3444                         'wgMonthNames' => $lang->getMonthNamesArray(),
3445                         'wgMonthNamesShort' => $lang->getMonthAbbreviationsArray(),
3446                         'wgRelevantPageName' => $relevantTitle->getPrefixedDBkey(),
3447                         'wgRelevantArticleId' => $relevantTitle->getArticleID(),
3448                         'wgRequestId' => WebRequest::getRequestId(),
3449                         'wgCSPNonce' => $this->getCSPNonce(),
3450                 ];
3451
3452                 if ( $user->isLoggedIn() ) {
3453                         $vars['wgUserId'] = $user->getId();
3454                         $vars['wgUserEditCount'] = $user->getEditCount();
3455                         $userReg = $user->getRegistration();
3456                         $vars['wgUserRegistration'] = $userReg ? wfTimestamp( TS_UNIX, $userReg ) * 1000 : null;
3457                         // Get the revision ID of the oldest new message on the user's talk
3458                         // page. This can be used for constructing new message alerts on
3459                         // the client side.
3460                         $vars['wgUserNewMsgRevisionId'] = $user->getNewMessageRevisionId();
3461                 }
3462
3463                 $contLang = $services->getContentLanguage();
3464                 if ( $contLang->hasVariants() ) {
3465                         $vars['wgUserVariant'] = $contLang->getPreferredVariant();
3466                 }
3467                 // Same test as SkinTemplate
3468                 $vars['wgIsProbablyEditable'] = $title->quickUserCan( 'edit', $user )
3469                         && ( $title->exists() || $title->quickUserCan( 'create', $user ) );
3470
3471                 $vars['wgRelevantPageIsProbablyEditable'] = $relevantTitle
3472                         && $relevantTitle->quickUserCan( 'edit', $user )
3473                         && ( $relevantTitle->exists() || $relevantTitle->quickUserCan( 'create', $user ) );
3474
3475                 foreach ( $title->getRestrictionTypes() as $type ) {
3476                         // Following keys are set in $vars:
3477                         // wgRestrictionCreate, wgRestrictionEdit, wgRestrictionMove, wgRestrictionUpload
3478                         $vars['wgRestriction' . ucfirst( $type )] = $title->getRestrictions( $type );
3479                 }
3480
3481                 if ( $title->isMainPage() ) {
3482                         $vars['wgIsMainPage'] = true;
3483                 }
3484
3485                 if ( $this->mRedirectedFrom ) {
3486                         $vars['wgRedirectedFrom'] = $this->mRedirectedFrom->getPrefixedDBkey();
3487                 }
3488
3489                 if ( $relevantUser ) {
3490                         $vars['wgRelevantUserName'] = $relevantUser->getName();
3491                 }
3492
3493                 // Allow extensions to add their custom variables to the mw.config map.
3494                 // Use the 'ResourceLoaderGetConfigVars' hook if the variable is not
3495                 // page-dependant but site-wide (without state).
3496                 // Alternatively, you may want to use OutputPage->addJsConfigVars() instead.
3497                 Hooks::run( 'MakeGlobalVariablesScript', [ &$vars, $this ] );
3498
3499                 // Merge in variables from addJsConfigVars last
3500                 return array_merge( $vars, $this->getJsConfigVars() );
3501         }
3502
3503         /**
3504          * To make it harder for someone to slip a user a fake
3505          * JavaScript or CSS preview, a random token
3506          * is associated with the login session. If it's not
3507          * passed back with the preview request, we won't render
3508          * the code.
3509          *
3510          * @return bool
3511          */
3512         public function userCanPreview() {
3513                 $request = $this->getRequest();
3514                 if (
3515                         $request->getVal( 'action' ) !== 'submit' ||
3516                         !$request->wasPosted()
3517                 ) {
3518                         return false;
3519                 }
3520
3521                 $user = $this->getUser();
3522
3523                 if ( !$user->isLoggedIn() ) {
3524                         // Anons have predictable edit tokens
3525                         return false;
3526                 }
3527                 if ( !$user->matchEditToken( $request->getVal( 'wpEditToken' ) ) ) {
3528                         return false;
3529                 }
3530
3531                 $title = $this->getTitle();
3532                 $errors = $title->getUserPermissionsErrors( 'edit', $user );
3533                 if ( count( $errors ) !== 0 ) {
3534                         return false;
3535                 }
3536
3537                 return true;
3538         }
3539
3540         /**
3541          * @return array Array in format "link name or number => 'link html'".
3542          */
3543         public function getHeadLinksArray() {
3544                 global $wgVersion;
3545
3546                 $tags = [];
3547                 $config = $this->getConfig();
3548
3549                 $canonicalUrl = $this->mCanonicalUrl;
3550
3551                 $tags['meta-generator'] = Html::element( 'meta', [
3552                         'name' => 'generator',
3553                         'content' => "MediaWiki $wgVersion",
3554                 ] );
3555
3556                 if ( $config->get( 'ReferrerPolicy' ) !== false ) {
3557                         // Per https://w3c.github.io/webappsec-referrer-policy/#unknown-policy-values
3558                         // fallbacks should come before the primary value so we need to reverse the array.
3559                         foreach ( array_reverse( (array)$config->get( 'ReferrerPolicy' ) ) as $i => $policy ) {
3560                                 $tags["meta-referrer-$i"] = Html::element( 'meta', [
3561                                         'name' => 'referrer',
3562                                         'content' => $policy,
3563                                 ] );
3564                         }
3565                 }
3566
3567                 $p = "{$this->mIndexPolicy},{$this->mFollowPolicy}";
3568                 if ( $p !== 'index,follow' ) {
3569                         // http://www.robotstxt.org/wc/meta-user.html
3570                         // Only show if it's different from the default robots policy
3571                         $tags['meta-robots'] = Html::element( 'meta', [
3572                                 'name' => 'robots',
3573                                 'content' => $p,
3574                         ] );
3575                 }
3576
3577                 foreach ( $this->mMetatags as $tag ) {
3578                         if ( strncasecmp( $tag[0], 'http:', 5 ) === 0 ) {
3579                                 $a = 'http-equiv';
3580                                 $tag[0] = substr( $tag[0], 5 );
3581                         } elseif ( strncasecmp( $tag[0], 'og:', 3 ) === 0 ) {
3582                                 $a = 'property';
3583                         } else {
3584                                 $a = 'name';
3585                         }
3586                         $tagName = "meta-{$tag[0]}";
3587                         if ( isset( $tags[$tagName] ) ) {
3588                                 $tagName .= $tag[1];
3589                         }
3590                         $tags[$tagName] = Html::element( 'meta',
3591                                 [
3592                                         $a => $tag[0],
3593                                         'content' => $tag[1]
3594                                 ]
3595                         );
3596                 }
3597
3598                 foreach ( $this->mLinktags as $tag ) {
3599                         $tags[] = Html::element( 'link', $tag );
3600                 }
3601
3602                 # Universal edit button
3603                 if ( $config->get( 'UniversalEditButton' ) && $this->isArticleRelated() ) {
3604                         $user = $this->getUser();
3605                         if ( $this->getTitle()->quickUserCan( 'edit', $user )
3606                                 && ( $this->getTitle()->exists() ||
3607                                         $this->getTitle()->quickUserCan( 'create', $user ) )
3608                         ) {
3609                                 // Original UniversalEditButton
3610                                 $msg = $this->msg( 'edit' )->text();
3611                                 $tags['universal-edit-button'] = Html::element( 'link', [
3612                                         'rel' => 'alternate',
3613                                         'type' => 'application/x-wiki',
3614                                         'title' => $msg,
3615                                         'href' => $this->getTitle()->getEditURL(),
3616                                 ] );
3617                                 // Alternate edit link
3618                                 $tags['alternative-edit'] = Html::element( 'link', [
3619                                         'rel' => 'edit',
3620                                         'title' => $msg,
3621                                         'href' => $this->getTitle()->getEditURL(),
3622                                 ] );
3623                         }
3624                 }
3625
3626                 # Generally the order of the favicon and apple-touch-icon links
3627                 # should not matter, but Konqueror (3.5.9 at least) incorrectly
3628                 # uses whichever one appears later in the HTML source. Make sure
3629                 # apple-touch-icon is specified first to avoid this.
3630                 if ( $config->get( 'AppleTouchIcon' ) !== false ) {
3631                         $tags['apple-touch-icon'] = Html::element( 'link', [
3632                                 'rel' => 'apple-touch-icon',
3633                                 'href' => $config->get( 'AppleTouchIcon' )
3634                         ] );
3635                 }
3636
3637                 if ( $config->get( 'Favicon' ) !== false ) {
3638                         $tags['favicon'] = Html::element( 'link', [
3639                                 'rel' => 'shortcut icon',
3640                                 'href' => $config->get( 'Favicon' )
3641                         ] );
3642                 }
3643
3644                 # OpenSearch description link
3645                 $tags['opensearch'] = Html::element( 'link', [
3646                         'rel' => 'search',
3647                         'type' => 'application/opensearchdescription+xml',
3648                         'href' => wfScript( 'opensearch_desc' ),
3649                         'title' => $this->msg( 'opensearch-desc' )->inContentLanguage()->text(),
3650                 ] );
3651
3652                 # Real Simple Discovery link, provides auto-discovery information
3653                 # for the MediaWiki API (and potentially additional custom API
3654                 # support such as WordPress or Twitter-compatible APIs for a
3655                 # blogging extension, etc)
3656                 $tags['rsd'] = Html::element( 'link', [
3657                         'rel' => 'EditURI',
3658                         'type' => 'application/rsd+xml',
3659                         // Output a protocol-relative URL here if $wgServer is protocol-relative.
3660                         // Whether RSD accepts relative or protocol-relative URLs is completely
3661                         // undocumented, though.
3662                         'href' => wfExpandUrl( wfAppendQuery(
3663                                 wfScript( 'api' ),
3664                                 [ 'action' => 'rsd' ] ),
3665                                 PROTO_RELATIVE
3666                         ),
3667                 ] );
3668
3669                 # Language variants
3670                 if ( !$config->get( 'DisableLangConversion' ) ) {
3671                         $lang = $this->getTitle()->getPageLanguage();
3672                         if ( $lang->hasVariants() ) {
3673                                 $variants = $lang->getVariants();
3674                                 foreach ( $variants as $variant ) {
3675                                         $tags["variant-$variant"] = Html::element( 'link', [
3676                                                 'rel' => 'alternate',
3677                                                 'hreflang' => LanguageCode::bcp47( $variant ),
3678                                                 'href' => $this->getTitle()->getLocalURL(
3679                                                         [ 'variant' => $variant ] )
3680                                                 ]
3681                                         );
3682                                 }
3683                                 # x-default link per https://support.google.com/webmasters/answer/189077?hl=en
3684                                 $tags["variant-x-default"] = Html::element( 'link', [
3685                                         'rel' => 'alternate',
3686                                         'hreflang' => 'x-default',
3687                                         'href' => $this->getTitle()->getLocalURL() ] );
3688                         }
3689                 }
3690
3691                 # Copyright
3692                 if ( $this->copyrightUrl !== null ) {
3693                         $copyright = $this->copyrightUrl;
3694                 } else {
3695                         $copyright = '';
3696                         if ( $config->get( 'RightsPage' ) ) {
3697                                 $copy = Title::newFromText( $config->get( 'RightsPage' ) );
3698
3699                                 if ( $copy ) {
3700                                         $copyright = $copy->getLocalURL();
3701                                 }
3702                         }
3703
3704                         if ( !$copyright && $config->get( 'RightsUrl' ) ) {
3705                                 $copyright = $config->get( 'RightsUrl' );
3706                         }
3707                 }
3708
3709                 if ( $copyright ) {
3710                         $tags['copyright'] = Html::element( 'link', [
3711                                 'rel' => 'license',
3712                                 'href' => $copyright ]
3713                         );
3714                 }
3715
3716                 # Feeds
3717                 if ( $config->get( 'Feed' ) ) {
3718                         $feedLinks = [];
3719
3720                         foreach ( $this->getSyndicationLinks() as $format => $link ) {
3721                                 # Use the page name for the title.  In principle, this could
3722                                 # lead to issues with having the same name for different feeds
3723                                 # corresponding to the same page, but we can't avoid that at
3724                                 # this low a level.
3725
3726                                 $feedLinks[] = $this->feedLink(
3727                                         $format,
3728                                         $link,
3729                                         # Used messages: 'page-rss-feed' and 'page-atom-feed' (for an easier grep)
3730                                         $this->msg(
3731                                                 "page-{$format}-feed", $this->getTitle()->getPrefixedText()
3732                                         )->text()
3733                                 );
3734                         }
3735
3736                         # Recent changes feed should appear on every page (except recentchanges,
3737                         # that would be redundant). Put it after the per-page feed to avoid
3738                         # changing existing behavior. It's still available, probably via a
3739                         # menu in your browser. Some sites might have a different feed they'd
3740                         # like to promote instead of the RC feed (maybe like a "Recent New Articles"
3741                         # or "Breaking news" one). For this, we see if $wgOverrideSiteFeed is defined.
3742                         # If so, use it instead.
3743                         $sitename = $config->get( 'Sitename' );
3744                         if ( $config->get( 'OverrideSiteFeed' ) ) {
3745                                 foreach ( $config->get( 'OverrideSiteFeed' ) as $type => $feedUrl ) {
3746                                         // Note, this->feedLink escapes the url.
3747                                         $feedLinks[] = $this->feedLink(
3748                                                 $type,
3749                                                 $feedUrl,
3750                                                 $this->msg( "site-{$type}-feed", $sitename )->text()
3751                                         );
3752                                 }
3753                         } elseif ( !$this->getTitle()->isSpecial( 'Recentchanges' ) ) {
3754                                 $rctitle = SpecialPage::getTitleFor( 'Recentchanges' );
3755                                 foreach ( $config->get( 'AdvertisedFeedTypes' ) as $format ) {
3756                                         $feedLinks[] = $this->feedLink(
3757                                                 $format,
3758                                                 $rctitle->getLocalURL( [ 'feed' => $format ] ),
3759                                                 # For grep: 'site-rss-feed', 'site-atom-feed'
3760                                                 $this->msg( "site-{$format}-feed", $sitename )->text()
3761                                         );
3762                                 }
3763                         }
3764
3765                         # Allow extensions to change the list pf feeds. This hook is primarily for changing,
3766                         # manipulating or removing existing feed tags. If you want to add new feeds, you should
3767                         # use OutputPage::addFeedLink() instead.
3768                         Hooks::run( 'AfterBuildFeedLinks', [ &$feedLinks ] );
3769
3770                         $tags += $feedLinks;
3771                 }
3772
3773                 # Canonical URL
3774                 if ( $config->get( 'EnableCanonicalServerLink' ) ) {
3775                         if ( $canonicalUrl !== false ) {
3776                                 $canonicalUrl = wfExpandUrl( $canonicalUrl, PROTO_CANONICAL );
3777                         } else {
3778                                 if ( $this->isArticleRelated() ) {
3779                                         // This affects all requests where "setArticleRelated" is true. This is
3780                                         // typically all requests that show content (query title, curid, oldid, diff),
3781                                         // and all wikipage actions (edit, delete, purge, info, history etc.).
3782                                         // It does not apply to File pages and Special pages.
3783                                         // 'history' and 'info' actions address page metadata rather than the page
3784                                         // content itself, so they may not be canonicalized to the view page url.
3785                                         // TODO: this ought to be better encapsulated in the Action class.
3786                                         $action = Action::getActionName( $this->getContext() );
3787                                         if ( in_array( $action, [ 'history', 'info' ] ) ) {
3788                                                 $query = "action={$action}";
3789                                         } else {
3790                                                 $query = '';
3791                                         }
3792                                         $canonicalUrl = $this->getTitle()->getCanonicalURL( $query );
3793                                 } else {
3794                                         $reqUrl = $this->getRequest()->getRequestURL();
3795                                         $canonicalUrl = wfExpandUrl( $reqUrl, PROTO_CANONICAL );
3796                                 }
3797                         }
3798                 }
3799                 if ( $canonicalUrl !== false ) {
3800                         $tags[] = Html::element( 'link', [
3801                                 'rel' => 'canonical',
3802                                 'href' => $canonicalUrl
3803                         ] );
3804                 }
3805
3806                 // Allow extensions to add, remove and/or otherwise manipulate these links
3807                 // If you want only to *add* <head> links, please use the addHeadItem()
3808                 // (or addHeadItems() for multiple items) method instead.
3809                 // This hook is provided as a last resort for extensions to modify these
3810                 // links before the output is sent to client.
3811                 Hooks::run( 'OutputPageAfterGetHeadLinksArray', [ &$tags, $this ] );
3812
3813                 return $tags;
3814         }
3815
3816         /**
3817          * Generate a "<link rel/>" for a feed.
3818          *
3819          * @param string $type Feed type
3820          * @param string $url URL to the feed
3821          * @param string $text Value of the "title" attribute
3822          * @return string HTML fragment
3823          */
3824         private function feedLink( $type, $url, $text ) {
3825                 return Html::element( 'link', [
3826                         'rel' => 'alternate',
3827                         'type' => "application/$type+xml",
3828                         'title' => $text,
3829                         'href' => $url ]
3830                 );
3831         }
3832
3833         /**
3834          * Add a local or specified stylesheet, with the given media options.
3835          * Internal use only. Use OutputPage::addModuleStyles() if possible.
3836          *
3837          * @param string $style URL to the file
3838          * @param string $media To specify a media type, 'screen', 'printable', 'handheld' or any.
3839          * @param string $condition For IE conditional comments, specifying an IE version
3840          * @param string $dir Set to 'rtl' or 'ltr' for direction-specific sheets
3841          */
3842         public function addStyle( $style, $media = '', $condition = '', $dir = '' ) {
3843                 $options = [];
3844                 if ( $media ) {
3845                         $options['media'] = $media;
3846                 }
3847                 if ( $condition ) {
3848                         $options['condition'] = $condition;
3849                 }
3850                 if ( $dir ) {
3851                         $options['dir'] = $dir;
3852                 }
3853                 $this->styles[$style] = $options;
3854         }
3855
3856         /**
3857          * Adds inline CSS styles
3858          * Internal use only. Use OutputPage::addModuleStyles() if possible.
3859          *
3860          * @param mixed $style_css Inline CSS
3861          * @param string $flip Set to 'flip' to flip the CSS if needed
3862          */
3863         public function addInlineStyle( $style_css, $flip = 'noflip' ) {
3864                 if ( $flip === 'flip' && $this->getLanguage()->isRTL() ) {
3865                         # If wanted, and the interface is right-to-left, flip the CSS
3866                         $style_css = CSSJanus::transform( $style_css, true, false );
3867                 }
3868                 $this->mInlineStyles .= Html::inlineStyle( $style_css );
3869         }
3870
3871         /**
3872          * Build exempt modules and legacy non-ResourceLoader styles.
3873          *
3874          * @return string|WrappedStringList HTML
3875          */
3876         protected function buildExemptModules() {
3877                 $chunks = [];
3878                 // Things that go after the ResourceLoaderDynamicStyles marker
3879                 $append = [];
3880
3881                 // We want site, private and user styles to override dynamically added styles from
3882                 // general modules, but we want dynamically added styles to override statically added
3883                 // style modules. So the order has to be:
3884                 // - page style modules (formatted by ResourceLoaderClientHtml::getHeadHtml())
3885                 // - dynamically loaded styles (added by mw.loader before ResourceLoaderDynamicStyles)
3886                 // - ResourceLoaderDynamicStyles marker
3887                 // - site/private/user styles
3888
3889                 // Add legacy styles added through addStyle()/addInlineStyle() here
3890                 $chunks[] = implode( '', $this->buildCssLinksArray() ) . $this->mInlineStyles;
3891
3892                 $chunks[] = Html::element(
3893                         'meta',
3894                         [ 'name' => 'ResourceLoaderDynamicStyles', 'content' => '' ]
3895                 );
3896
3897                 $separateReq = [ 'site.styles', 'user.styles' ];
3898                 foreach ( $this->rlExemptStyleModules as $group => $moduleNames ) {
3899                         // Combinable modules
3900                         $chunks[] = $this->makeResourceLoaderLink(
3901                                 array_diff( $moduleNames, $separateReq ),
3902                                 ResourceLoaderModule::TYPE_STYLES
3903                         );
3904
3905                         foreach ( array_intersect( $moduleNames, $separateReq ) as $name ) {
3906                                 // These require their own dedicated request in order to support "@import"
3907                                 // syntax, which is incompatible with concatenation. (T147667, T37562)
3908                                 $chunks[] = $this->makeResourceLoaderLink( $name,
3909                                         ResourceLoaderModule::TYPE_STYLES
3910                                 );
3911                         }
3912                 }
3913
3914                 return self::combineWrappedStrings( array_merge( $chunks, $append ) );
3915         }
3916
3917         /**
3918          * @return array
3919          */
3920         public function buildCssLinksArray() {
3921                 $links = [];
3922
3923                 foreach ( $this->styles as $file => $options ) {
3924                         $link = $this->styleLink( $file, $options );
3925                         if ( $link ) {
3926                                 $links[$file] = $link;
3927                         }
3928                 }
3929                 return $links;
3930         }
3931
3932         /**
3933          * Generate \<link\> tags for stylesheets
3934          *
3935          * @param string $style URL to the file
3936          * @param array $options Option, can contain 'condition', 'dir', 'media' keys
3937          * @return string HTML fragment
3938          */
3939         protected function styleLink( $style, array $options ) {
3940                 if ( isset( $options['dir'] ) ) {
3941                         if ( $this->getLanguage()->getDir() != $options['dir'] ) {
3942                                 return '';
3943                         }
3944                 }
3945
3946                 if ( isset( $options['media'] ) ) {
3947                         $media = self::transformCssMedia( $options['media'] );
3948                         if ( is_null( $media ) ) {
3949                                 return '';
3950                         }
3951                 } else {
3952                         $media = 'all';
3953                 }
3954
3955                 if ( substr( $style, 0, 1 ) == '/' ||
3956                         substr( $style, 0, 5 ) == 'http:' ||
3957                         substr( $style, 0, 6 ) == 'https:' ) {
3958                         $url = $style;
3959                 } else {
3960                         $config = $this->getConfig();
3961                         // Append file hash as query parameter
3962                         $url = self::transformResourcePath(
3963                                 $config,
3964                                 $config->get( 'StylePath' ) . '/' . $style
3965                         );
3966                 }
3967
3968                 $link = Html::linkedStyle( $url, $media );
3969
3970                 if ( isset( $options['condition'] ) ) {
3971                         $condition = htmlspecialchars( $options['condition'] );
3972                         $link = "<!--[if $condition]>$link<![endif]-->";
3973                 }
3974                 return $link;
3975         }
3976
3977         /**
3978          * Transform path to web-accessible static resource.
3979          *
3980          * This is used to add a validation hash as query string.
3981          * This aids various behaviors:
3982          *
3983          * - Put long Cache-Control max-age headers on responses for improved
3984          *   cache performance.
3985          * - Get the correct version of a file as expected by the current page.
3986          * - Instantly get the updated version of a file after deployment.
3987          *
3988          * Avoid using this for urls included in HTML as otherwise clients may get different
3989          * versions of a resource when navigating the site depending on when the page was cached.
3990          * If changes to the url propagate, this is not a problem (e.g. if the url is in
3991          * an external stylesheet).
3992          *
3993          * @since 1.27
3994          * @param Config $config
3995          * @param string $path Path-absolute URL to file (from document root, must start with "/")
3996          * @return string URL
3997          */
3998         public static function transformResourcePath( Config $config, $path ) {
3999                 global $IP;
4000
4001                 $localDir = $IP;
4002                 $remotePathPrefix = $config->get( 'ResourceBasePath' );
4003                 if ( $remotePathPrefix === '' ) {
4004                         // The configured base path is required to be empty string for
4005                         // wikis in the domain root
4006                         $remotePath = '/';
4007                 } else {
4008                         $remotePath = $remotePathPrefix;
4009                 }
4010                 if ( strpos( $path, $remotePath ) !== 0 || substr( $path, 0, 2 ) === '//' ) {
4011                         // - Path is outside wgResourceBasePath, ignore.
4012                         // - Path is protocol-relative. Fixes T155310. Not supported by RelPath lib.
4013                         return $path;
4014                 }
4015                 // For files in resources, extensions/ or skins/, ResourceBasePath is preferred here.
4016                 // For other misc files in $IP, we'll fallback to that as well. There is, however, a fourth
4017                 // supported dir/path pair in the configuration (wgUploadDirectory, wgUploadPath)
4018                 // which is not expected to be in wgResourceBasePath on CDNs. (T155146)
4019                 $uploadPath = $config->get( 'UploadPath' );
4020                 if ( strpos( $path, $uploadPath ) === 0 ) {
4021                         $localDir = $config->get( 'UploadDirectory' );
4022                         $remotePathPrefix = $remotePath = $uploadPath;
4023                 }
4024
4025                 $path = RelPath::getRelativePath( $path, $remotePath );
4026                 return self::transformFilePath( $remotePathPrefix, $localDir, $path );
4027         }
4028
4029         /**
4030          * Utility method for transformResourceFilePath().
4031          *
4032          * Caller is responsible for ensuring the file exists. Emits a PHP warning otherwise.
4033          *
4034          * @since 1.27
4035          * @param string $remotePathPrefix URL path prefix that points to $localPath
4036          * @param string $localPath File directory exposed at $remotePath
4037          * @param string $file Path to target file relative to $localPath
4038          * @return string URL
4039          */
4040         public static function transformFilePath( $remotePathPrefix, $localPath, $file ) {
4041                 $hash = md5_file( "$localPath/$file" );
4042                 if ( $hash === false ) {
4043                         wfLogWarning( __METHOD__ . ": Failed to hash $localPath/$file" );
4044                         $hash = '';
4045                 }
4046                 return "$remotePathPrefix/$file?" . substr( $hash, 0, 5 );
4047         }
4048
4049         /**
4050          * Transform "media" attribute based on request parameters
4051          *
4052          * @param string $media Current value of the "media" attribute
4053          * @return string Modified value of the "media" attribute, or null to skip
4054          * this stylesheet
4055          */
4056         public static function transformCssMedia( $media ) {
4057                 global $wgRequest;
4058
4059                 // https://www.w3.org/TR/css3-mediaqueries/#syntax
4060                 $screenMediaQueryRegex = '/^(?:only\s+)?screen\b/i';
4061
4062                 // Switch in on-screen display for media testing
4063                 $switches = [
4064                         'printable' => 'print',
4065                         'handheld' => 'handheld',
4066                 ];
4067                 foreach ( $switches as $switch => $targetMedia ) {
4068                         if ( $wgRequest->getBool( $switch ) ) {
4069                                 if ( $media == $targetMedia ) {
4070                                         $media = '';
4071                                 } elseif ( preg_match( $screenMediaQueryRegex, $media ) === 1 ) {
4072                                         /* This regex will not attempt to understand a comma-separated media_query_list
4073                                          *
4074                                          * Example supported values for $media:
4075                                          * 'screen', 'only screen', 'screen and (min-width: 982px)' ),
4076                                          * Example NOT supported value for $media:
4077                                          * '3d-glasses, screen, print and resolution > 90dpi'
4078                                          *
4079                                          * If it's a print request, we never want any kind of screen stylesheets
4080                                          * If it's a handheld request (currently the only other choice with a switch),
4081                                          * we don't want simple 'screen' but we might want screen queries that
4082                                          * have a max-width or something, so we'll pass all others on and let the
4083                                          * client do the query.
4084                                          */
4085                                         if ( $targetMedia == 'print' || $media == 'screen' ) {
4086                                                 return null;
4087                                         }
4088                                 }
4089                         }
4090                 }
4091
4092                 return $media;
4093         }
4094
4095         /**
4096          * Add a wikitext-formatted message to the output.
4097          * This is equivalent to:
4098          *
4099          *    $wgOut->addWikiText( wfMessage( ... )->plain() )
4100          */
4101         public function addWikiMsg( /*...*/ ) {
4102                 $args = func_get_args();
4103                 $name = array_shift( $args );
4104                 $this->addWikiMsgArray( $name, $args );
4105         }
4106
4107         /**
4108          * Add a wikitext-formatted message to the output.
4109          * Like addWikiMsg() except the parameters are taken as an array
4110          * instead of a variable argument list.
4111          *
4112          * @param string $name
4113          * @param array $args
4114          */
4115         public function addWikiMsgArray( $name, $args ) {
4116                 $this->addHTML( $this->msg( $name, $args )->parseAsBlock() );
4117         }
4118
4119         /**
4120          * This function takes a number of message/argument specifications, wraps them in
4121          * some overall structure, and then parses the result and adds it to the output.
4122          *
4123          * In the $wrap, $1 is replaced with the first message, $2 with the second,
4124          * and so on. The subsequent arguments may be either
4125          * 1) strings, in which case they are message names, or
4126          * 2) arrays, in which case, within each array, the first element is the message
4127          *    name, and subsequent elements are the parameters to that message.
4128          *
4129          * Don't use this for messages that are not in the user's interface language.
4130          *
4131          * For example:
4132          *
4133          *    $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>", 'some-error' );
4134          *
4135          * Is equivalent to:
4136          *
4137          *    $wgOut->addWikiTextAsInterface( "<div class='error'>\n"
4138          *        . wfMessage( 'some-error' )->plain() . "\n</div>" );
4139          *
4140          * The newline after the opening div is needed in some wikitext. See T21226.
4141          *
4142          * @param string $wrap
4143          */
4144         public function wrapWikiMsg( $wrap /*, ...*/ ) {
4145                 $msgSpecs = func_get_args();
4146                 array_shift( $msgSpecs );
4147                 $msgSpecs = array_values( $msgSpecs );
4148                 $s = $wrap;
4149                 foreach ( $msgSpecs as $n => $spec ) {
4150                         if ( is_array( $spec ) ) {
4151                                 $args = $spec;
4152                                 $name = array_shift( $args );
4153                                 if ( isset( $args['options'] ) ) {
4154                                         unset( $args['options'] );
4155                                         wfDeprecated(
4156                                                 'Adding "options" to ' . __METHOD__ . ' is no longer supported',
4157                                                 '1.20'
4158                                         );
4159                                 }
4160                         } else {
4161                                 $args = [];
4162                                 $name = $spec;
4163                         }
4164                         $s = str_replace( '$' . ( $n + 1 ), $this->msg( $name, $args )->plain(), $s );
4165                 }
4166                 $this->addWikiTextAsInterface( $s );
4167         }
4168
4169         /**
4170          * Whether the output has a table of contents
4171          * @return bool
4172          * @since 1.22
4173          */
4174         public function isTOCEnabled() {
4175                 return $this->mEnableTOC;
4176         }
4177
4178         /**
4179          * Enables/disables section edit links, doesn't override __NOEDITSECTION__
4180          * @param bool $flag
4181          * @since 1.23
4182          * @deprecated since 1.31, use $poOptions to addParserOutput() instead.
4183          */
4184         public function enableSectionEditLinks( $flag = true ) {
4185                 wfDeprecated( __METHOD__, '1.31' );
4186         }
4187
4188         /**
4189          * @return bool
4190          * @since 1.23
4191          * @deprecated since 1.31, use $poOptions to addParserOutput() instead.
4192          */
4193         public function sectionEditLinksEnabled() {
4194                 wfDeprecated( __METHOD__, '1.31' );
4195                 return true;
4196         }
4197
4198         /**
4199          * Helper function to setup the PHP implementation of OOUI to use in this request.
4200          *
4201          * @since 1.26
4202          * @param string $skinName The Skin name to determine the correct OOUI theme
4203          * @param string $dir Language direction
4204          */
4205         public static function setupOOUI( $skinName = 'default', $dir = 'ltr' ) {
4206                 $themes = ResourceLoaderOOUIModule::getSkinThemeMap();
4207                 $theme = $themes[$skinName] ?? $themes['default'];
4208                 // For example, 'OOUI\WikimediaUITheme'.
4209                 $themeClass = "OOUI\\{$theme}Theme";
4210                 OOUI\Theme::setSingleton( new $themeClass() );
4211                 OOUI\Element::setDefaultDir( $dir );
4212         }
4213
4214         /**
4215          * Add ResourceLoader module styles for OOUI and set up the PHP implementation of it for use with
4216          * MediaWiki and this OutputPage instance.
4217          *
4218          * @since 1.25
4219          */
4220         public function enableOOUI() {
4221                 self::setupOOUI(
4222                         strtolower( $this->getSkin()->getSkinName() ),
4223                         $this->getLanguage()->getDir()
4224                 );
4225                 $this->addModuleStyles( [
4226                         'oojs-ui-core.styles',
4227                         'oojs-ui.styles.indicators',
4228                         'oojs-ui.styles.textures',
4229                         'mediawiki.widgets.styles',
4230                         'oojs-ui.styles.icons-content',
4231                         'oojs-ui.styles.icons-alerts',
4232                         'oojs-ui.styles.icons-interactions',
4233                 ] );
4234         }
4235
4236         /**
4237          * Get (and set if not yet set) the CSP nonce.
4238          *
4239          * This value needs to be included in any <script> tags on the
4240          * page.
4241          *
4242          * @return string|bool Nonce or false to mean don't output nonce
4243          * @since 1.32
4244          */
4245         public function getCSPNonce() {
4246                 if ( !ContentSecurityPolicy::isNonceRequired( $this->getConfig() ) ) {
4247                         return false;
4248                 }
4249                 if ( $this->CSPNonce === null ) {
4250                         // XXX It might be expensive to generate randomness
4251                         // on every request, on Windows.
4252                         $rand = random_bytes( 15 );
4253                         $this->CSPNonce = base64_encode( $rand );
4254                 }
4255                 return $this->CSPNonce;
4256         }
4257
4258 }