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\Logger\LoggerFactory;
  24 use MediaWiki\Session\SessionManager;
  25 use WrappedString\WrappedString;
  26
  27 /**
  28  * This class should be covered by a general architecture document which does
  29  * not exist as of January 2011.  This is one of the Core classes and should
  30  * be read at least once by any new developers.
  31  *
  32  * This class is used to prepare the final rendering. A skin is then
  33  * applied to the output parameters (links, javascript, html, categories ...).
  34  *
  35  * @todo FIXME: Another class handles sending the whole page to the client.
  36  *
  37  * Some comments comes from a pairing session between Zak Greant and Antoine Musso
  38  * in November 2010.
  39  *
  40  * @todo document
  41  */
  42 class OutputPage extends ContextSource {
  43         /** @var array Should be private. Used with addMeta() which adds "<meta>" */
  44         protected $mMetatags = [];
  45
  46         /** @var array */
  47         protected $mLinktags = [];
  48
  49         /** @var bool */
  50         protected $mCanonicalUrl = false;
  51
  52         /**
  53          * @var array Additional stylesheets. Looks like this is for extensions.
  54          *   Might be replaced by ResourceLoader.
  55          */
  56         protected $mExtStyles = [];
  57
  58         /**
  59          * @var string Should be private - has getter and setter. Contains
  60          *   the HTML title */
  61         public $mPagetitle = '';
  62
  63         /**
  64          * @var string Contains all of the "<body>" content. Should be private we
  65          *   got set/get accessors and the append() method.
  66          */
  67         public $mBodytext = '';
  68
  69         /**
  70          * Holds the debug lines that will be output as comments in page source if
  71          * $wgDebugComments is enabled. See also $wgShowDebug.
  72          * @deprecated since 1.20; use MWDebug class instead.
  73          */
  74         public $mDebugtext = '';
  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         /**
  89          * @var bool We have to set isPrintable(). Some pages should
  90          * never be printed (ex: redirections).
  91          */
  92         private $mPrintable = false;
  93
  94         /**
  95          * @var array Contains the page subtitle. Special pages usually have some
  96          *   links here. Don't confuse with site subtitle added by skins.
  97          */
  98         private $mSubtitle = [];
  99
 100         /** @var string */
 101         public $mRedirect = '';
 102
 103         /** @var int */
 104         protected $mStatusCode;
 105
 106         /**
 107          * @var string Variable mLastModified and mEtag are used for sending cache control.
 108          *   The whole caching system should probably be moved into its own class.
 109          */
 110         protected $mLastModified = '';
 111
 112         /**
 113          * Contains an HTTP Entity Tags (see RFC 2616 section 3.13) which is used
 114          * as a unique identifier for the content. It is later used by the client
 115          * to compare its cached version with the server version. Client sends
 116          * headers If-Match and If-None-Match containing its locally cached ETAG value.
 117          *
 118          * To get more information, you will have to look at HTTP/1.1 protocol which
 119          * is properly described in RFC 2616 : http://tools.ietf.org/html/rfc2616
 120          */
 121         private $mETag = false;
 122
 123         /** @var array */
 124         protected $mCategoryLinks = [];
 125
 126         /** @var array */
 127         protected $mCategories = [];
 128
 129         /** @var array */
 130         protected $mIndicators = [];
 131
 132         /** @var array Array of Interwiki Prefixed (non DB key) Titles (e.g. 'fr:Test page') */
 133         private $mLanguageLinks = [];
 134
 135         /**
 136          * Used for JavaScript (predates ResourceLoader)
 137          * @todo We should split JS / CSS.
 138          * mScripts content is inserted as is in "<head>" by Skin. This might
 139          * contain either a link to a stylesheet or inline CSS.
 140          */
 141         private $mScripts = '';
 142
 143         /** @var string Inline CSS styles. Use addInlineStyle() sparingly */
 144         protected $mInlineStyles = '';
 145
 146         /**
 147          * @var string Used by skin template.
 148          * Example: $tpl->set( 'displaytitle', $out->mPageLinkTitle );
 149          */
 150         public $mPageLinkTitle = '';
 151
 152         /** @var array Array of elements in "<head>". Parser might add its own headers! */
 153         protected $mHeadItems = [];
 154
 155         /** @var array */
 156         protected $mModules = [];
 157
 158         /** @var array */
 159         protected $mModuleScripts = [];
 160
 161         /** @var array */
 162         protected $mModuleStyles = [];
 163
 164         /** @var ResourceLoader */
 165         protected $mResourceLoader;
 166
 167         /** @var array */
 168         protected $mJsConfigVars = [];
 169
 170         /** @var array */
 171         protected $mTemplateIds = [];
 172
 173         /** @var array */
 174         protected $mImageTimeKeys = [];
 175
 176         /** @var string */
 177         public $mRedirectCode = '';
 178
 179         protected $mFeedLinksAppendQuery = null;
 180
 181         /** @var array
 182          * What level of 'untrustworthiness' is allowed in CSS/JS modules loaded on this page?
 183          * @see ResourceLoaderModule::$origin
 184          * ResourceLoaderModule::ORIGIN_ALL is assumed unless overridden;
 185          */
 186         protected $mAllowedModules = [
 187                 ResourceLoaderModule::TYPE_COMBINED => ResourceLoaderModule::ORIGIN_ALL,
 188         ];
 189
 190         /** @var bool Whether output is disabled.  If this is true, the 'output' method will do nothing. */
 191         protected $mDoNothing = false;
 192
 193         // Parser related.
 194
 195         /** @var int */
 196         protected $mContainsNewMagic = 0;
 197
 198         /**
 199          * lazy initialised, use parserOptions()
 200          * @var ParserOptions
 201          */
 202         protected $mParserOptions = null;
 203
 204         /**
 205          * Handles the Atom / RSS links.
 206          * We probably only support Atom in 2011.
 207          * @see $wgAdvertisedFeedTypes
 208          */
 209         private $mFeedLinks = [];
 210
 211         // Gwicke work on squid caching? Roughly from 2003.
 212         protected $mEnableClientCache = true;
 213
 214         /** @var bool Flag if output should only contain the body of the article. */
 215         private $mArticleBodyOnly = false;
 216
 217         /** @var bool */
 218         protected $mNewSectionLink = false;
 219
 220         /** @var bool */
 221         protected $mHideNewSectionLink = false;
 222
 223         /**
 224          * @var bool Comes from the parser. This was probably made to load CSS/JS
 225          * only if we had "<gallery>". Used directly in CategoryPage.php.
 226          * Looks like ResourceLoader can replace this.
 227          */
 228         public $mNoGallery = false;
 229
 230         /** @var string */
 231         private $mPageTitleActionText = '';
 232
 233         /** @var int Cache stuff. Looks like mEnableClientCache */
 234         protected $mCdnMaxage = 0;
 235         /** @var int Upper limit on mCdnMaxage */
 236         protected $mCdnMaxageLimit = INF;
 237
 238         /**
 239          * @var bool Controls if anti-clickjacking / frame-breaking headers will
 240          * be sent. This should be done for pages where edit actions are possible.
 241          * Setters: $this->preventClickjacking() and $this->allowClickjacking().
 242          */
 243         protected $mPreventClickjacking = true;
 244
 245         /** @var int To include the variable {{REVISIONID}} */
 246         private $mRevisionId = null;
 247
 248         /** @var string */
 249         private $mRevisionTimestamp = null;
 250
 251         /** @var array */
 252         protected $mFileVersion = null;
 253
 254         /**
 255          * @var array An array of stylesheet filenames (relative from skins path),
 256          * with options for CSS media, IE conditions, and RTL/LTR direction.
 257          * For internal use; add settings in the skin via $this->addStyle()
 258          *
 259          * Style again! This seems like a code duplication since we already have
 260          * mStyles. This is what makes Open Source amazing.
 261          */
 262         protected $styles = [];
 263
 264         /**
 265          * Whether jQuery is already handled.
 266          */
 267         protected $mJQueryDone = false;
 268
 269         private $mIndexPolicy = 'index';
 270         private $mFollowPolicy = 'follow';
 271         private $mVaryHeader = [
 272                 'Accept-Encoding' => [ 'match=gzip' ],
 273         ];
 274
 275         /**
 276          * If the current page was reached through a redirect, $mRedirectedFrom contains the Title
 277          * of the redirect.
 278          *
 279          * @var Title
 280          */
 281         private $mRedirectedFrom = null;
 282
 283         /**
 284          * Additional key => value data
 285          */
 286         private $mProperties = [];
 287
 288         /**
 289          * @var string|null ResourceLoader target for load.php links. If null, will be omitted
 290          */
 291         private $mTarget = null;
 292
 293         /**
 294          * @var bool Whether parser output should contain table of contents
 295          */
 296         private $mEnableTOC = true;
 297
 298         /**
 299          * @var bool Whether parser output should contain section edit links
 300          */
 301         private $mEnableSectionEditLinks = true;
 302
 303         /**
 304          * @var string|null The URL to send in a <link> element with rel=copyright
 305          */
 306         private $copyrightUrl;
 307
 308         /**
 309          * Constructor for OutputPage. This should not be called directly.
 310          * Instead a new RequestContext should be created and it will implicitly create
 311          * a OutputPage tied to that context.
 312          * @param IContextSource|null $context
 313          */
 314         function __construct( IContextSource $context = null ) {
 315                 if ( $context === null ) {
 316                         # Extensions should use `new RequestContext` instead of `new OutputPage` now.
 317                         wfDeprecated( __METHOD__, '1.18' );
 318                 } else {
 319                         $this->setContext( $context );
 320                 }
 321         }
 322
 323         /**
 324          * Redirect to $url rather than displaying the normal page
 325          *
 326          * @param string $url URL
 327          * @param string $responsecode HTTP status code
 328          */
 329         public function redirect( $url, $responsecode = '302' ) {
 330                 # Strip newlines as a paranoia check for header injection in PHP<5.1.2
 331                 $this->mRedirect = str_replace( "\n", '', $url );
 332                 $this->mRedirectCode = $responsecode;
 333         }
 334
 335         /**
 336          * Get the URL to redirect to, or an empty string if not redirect URL set
 337          *
 338          * @return string
 339          */
 340         public function getRedirect() {
 341                 return $this->mRedirect;
 342         }
 343
 344         /**
 345          * Set the copyright URL to send with the output.
 346          * Empty string to omit, null to reset.
 347          *
 348          * @since 1.26
 349          *
 350          * @param string|null $url
 351          */
 352         public function setCopyrightUrl( $url ) {
 353                 $this->copyrightUrl = $url;
 354         }
 355
 356         /**
 357          * Set the HTTP status code to send with the output.
 358          *
 359          * @param int $statusCode
 360          */
 361         public function setStatusCode( $statusCode ) {
 362                 $this->mStatusCode = $statusCode;
 363         }
 364
 365         /**
 366          * Add a new "<meta>" tag
 367          * To add an http-equiv meta tag, precede the name with "http:"
 368          *
 369          * @param string $name Tag name
 370          * @param string $val Tag value
 371          */
 372         function addMeta( $name, $val ) {
 373                 array_push( $this->mMetatags, [ $name, $val ] );
 374         }
 375
 376         /**
 377          * Returns the current <meta> tags
 378          *
 379          * @since 1.25
 380          * @return array
 381          */
 382         public function getMetaTags() {
 383                 return $this->mMetatags;
 384         }
 385
 386         /**
 387          * Add a new \<link\> tag to the page header.
 388          *
 389          * Note: use setCanonicalUrl() for rel=canonical.
 390          *
 391          * @param array $linkarr Associative array of attributes.
 392          */
 393         function addLink( array $linkarr ) {
 394                 array_push( $this->mLinktags, $linkarr );
 395         }
 396
 397         /**
 398          * Returns the current <link> tags
 399          *
 400          * @since 1.25
 401          * @return array
 402          */
 403         public function getLinkTags() {
 404                 return $this->mLinktags;
 405         }
 406
 407         /**
 408          * Add a new \<link\> with "rel" attribute set to "meta"
 409          *
 410          * @param array $linkarr Associative array mapping attribute names to their
 411          *                 values, both keys and values will be escaped, and the
 412          *                 "rel" attribute will be automatically added
 413          */
 414         function addMetadataLink( array $linkarr ) {
 415                 $linkarr['rel'] = $this->getMetadataAttribute();
 416                 $this->addLink( $linkarr );
 417         }
 418
 419         /**
 420          * Set the URL to be used for the <link rel=canonical>. This should be used
 421          * in preference to addLink(), to avoid duplicate link tags.
 422          * @param string $url
 423          */
 424         function setCanonicalUrl( $url ) {
 425                 $this->mCanonicalUrl = $url;
 426         }
 427
 428         /**
 429          * Returns the URL to be used for the <link rel=canonical> if
 430          * one is set.
 431          *
 432          * @since 1.25
 433          * @return bool|string
 434          */
 435         public function getCanonicalUrl() {
 436                 return $this->mCanonicalUrl;
 437         }
 438
 439         /**
 440          * Get the value of the "rel" attribute for metadata links
 441          *
 442          * @return string
 443          */
 444         public function getMetadataAttribute() {
 445                 # note: buggy CC software only reads first "meta" link
 446                 static $haveMeta = false;
 447                 if ( $haveMeta ) {
 448                         return 'alternate meta';
 449                 } else {
 450                         $haveMeta = true;
 451                         return 'meta';
 452                 }
 453         }
 454
 455         /**
 456          * Add raw HTML to the list of scripts (including \<script\> tag, etc.)
 457          * Internal use only. Use OutputPage::addModules() or OutputPage::addJsConfigVars()
 458          * if possible.
 459          *
 460          * @param string $script Raw HTML
 461          */
 462         function addScript( $script ) {
 463                 $this->mScripts .= $script . "\n";
 464         }
 465
 466         /**
 467          * Register and add a stylesheet from an extension directory.
 468          *
 469          * @deprecated since 1.27 use addModuleStyles() or addStyle() instead
 470          * @param string $url Path to sheet.  Provide either a full url (beginning
 471          *             with 'http', etc) or a relative path from the document root
 472          *             (beginning with '/').  Otherwise it behaves identically to
 473          *             addStyle() and draws from the /skins folder.
 474          */
 475         public function addExtensionStyle( $url ) {
 476                 wfDeprecated( __METHOD__, '1.27' );
 477                 array_push( $this->mExtStyles, $url );
 478         }
 479
 480         /**
 481          * Get all styles added by extensions
 482          *
 483          * @deprecated since 1.27
 484          * @return array
 485          */
 486         function getExtStyle() {
 487                 wfDeprecated( __METHOD__, '1.27' );
 488                 return $this->mExtStyles;
 489         }
 490
 491         /**
 492          * Add a JavaScript file out of skins/common, or a given relative path.
 493          * Internal use only. Use OutputPage::addModules() if possible.
 494          *
 495          * @param string $file Filename in skins/common or complete on-server path
 496          *              (/foo/bar.js)
 497          * @param string $version Style version of the file. Defaults to $wgStyleVersion
 498          */
 499         public function addScriptFile( $file, $version = null ) {
 500                 // See if $file parameter is an absolute URL or begins with a slash
 501                 if ( substr( $file, 0, 1 ) == '/' || preg_match( '#^[a-z]*://#i', $file ) ) {
 502                         $path = $file;
 503                 } else {
 504                         $path = $this->getConfig()->get( 'StylePath' ) . "/common/{$file}";
 505                 }
 506                 if ( is_null( $version ) ) {
 507                         $version = $this->getConfig()->get( 'StyleVersion' );
 508                 }
 509                 $this->addScript( Html::linkedScript( wfAppendQuery( $path, $version ) ) );
 510         }
 511
 512         /**
 513          * Add a self-contained script tag with the given contents
 514          * Internal use only. Use OutputPage::addModules() if possible.
 515          *
 516          * @param string $script JavaScript text, no "<script>" tags
 517          */
 518         public function addInlineScript( $script ) {
 519                 $this->mScripts .= Html::inlineScript( "\n$script\n" ) . "\n";
 520         }
 521
 522         /**
 523          * Get all registered JS and CSS tags for the header.
 524          *
 525          * @return string
 526          * @deprecated since 1.24 Use OutputPage::headElement to build the full header.
 527          */
 528         function getScript() {
 529                 wfDeprecated( __METHOD__, '1.24' );
 530                 return $this->mScripts . $this->getHeadItems();
 531         }
 532
 533         /**
 534          * Filter an array of modules to remove insufficiently trustworthy members, and modules
 535          * which are no longer registered (eg a page is cached before an extension is disabled)
 536          * @param array $modules
 537          * @param string|null $position If not null, only return modules with this position
 538          * @param string $type
 539          * @return array
 540          */
 541         protected function filterModules( array $modules, $position = null,
 542                 $type = ResourceLoaderModule::TYPE_COMBINED
 543         ) {
 544                 $resourceLoader = $this->getResourceLoader();
 545                 $filteredModules = [];
 546                 foreach ( $modules as $val ) {
 547                         $module = $resourceLoader->getModule( $val );
 548                         if ( $module instanceof ResourceLoaderModule
 549                                 && $module->getOrigin() <= $this->getAllowedModules( $type )
 550                                 && ( is_null( $position ) || $module->getPosition() == $position )
 551                                 && ( !$this->mTarget || in_array( $this->mTarget, $module->getTargets() ) )
 552                         ) {
 553                                 $filteredModules[] = $val;
 554                         }
 555                 }
 556                 return $filteredModules;
 557         }
 558
 559         /**
 560          * Get the list of modules to include on this page
 561          *
 562          * @param bool $filter Whether to filter out insufficiently trustworthy modules
 563          * @param string|null $position If not null, only return modules with this position
 564          * @param string $param
 565          * @return array Array of module names
 566          */
 567         public function getModules( $filter = false, $position = null, $param = 'mModules' ) {
 568                 $modules = array_values( array_unique( $this->$param ) );
 569                 return $filter
 570                         ? $this->filterModules( $modules, $position )
 571                         : $modules;
 572         }
 573
 574         /**
 575          * Add one or more modules recognized by ResourceLoader. Modules added
 576          * through this function will be loaded by ResourceLoader when the
 577          * page loads.
 578          *
 579          * @param string|array $modules Module name (string) or array of module names
 580          */
 581         public function addModules( $modules ) {
 582                 $this->mModules = array_merge( $this->mModules, (array)$modules );
 583         }
 584
 585         /**
 586          * Get the list of module JS to include on this page
 587          *
 588          * @param bool $filter
 589          * @param string|null $position
 590          *
 591          * @return array Array of module names
 592          */
 593         public function getModuleScripts( $filter = false, $position = null ) {
 594                 return $this->getModules( $filter, $position, 'mModuleScripts' );
 595         }
 596
 597         /**
 598          * Add only JS of one or more modules recognized by ResourceLoader. Module
 599          * scripts added through this function will be loaded by ResourceLoader when
 600          * the page loads.
 601          *
 602          * @param string|array $modules Module name (string) or array of module names
 603          */
 604         public function addModuleScripts( $modules ) {
 605                 $this->mModuleScripts = array_merge( $this->mModuleScripts, (array)$modules );
 606         }
 607
 608         /**
 609          * Get the list of module CSS to include on this page
 610          *
 611          * @param bool $filter
 612          * @param string|null $position
 613          *
 614          * @return array Array of module names
 615          */
 616         public function getModuleStyles( $filter = false, $position = null ) {
 617                 return $this->getModules( $filter, $position, 'mModuleStyles' );
 618         }
 619
 620         /**
 621          * Add only CSS of one or more modules recognized by ResourceLoader.
 622          *
 623          * Module styles added through this function will be added using standard link CSS
 624          * tags, rather than as a combined Javascript and CSS package. Thus, they will
 625          * load when JavaScript is disabled (unless CSS also happens to be disabled).
 626          *
 627          * @param string|array $modules Module name (string) or array of module names
 628          */
 629         public function addModuleStyles( $modules ) {
 630                 $this->mModuleStyles = array_merge( $this->mModuleStyles, (array)$modules );
 631         }
 632
 633         /**
 634          * Get the list of module messages to include on this page
 635          *
 636          * @deprecated since 1.26 Obsolete
 637          * @param bool $filter
 638          * @param string|null $position
 639          * @return array Array of module names
 640          */
 641         public function getModuleMessages( $filter = false, $position = null ) {
 642                 wfDeprecated( __METHOD__, '1.26' );
 643                 return [];
 644         }
 645
 646         /**
 647          * Load messages of one or more ResourceLoader modules.
 648          *
 649          * @deprecated since 1.26 Use addModules() instead
 650          * @param string|array $modules Module name (string) or array of module names
 651          */
 652         public function addModuleMessages( $modules ) {
 653                 wfDeprecated( __METHOD__, '1.26' );
 654         }
 655
 656         /**
 657          * @return null|string ResourceLoader target
 658          */
 659         public function getTarget() {
 660                 return $this->mTarget;
 661         }
 662
 663         /**
 664          * Sets ResourceLoader target for load.php links. If null, will be omitted
 665          *
 666          * @param string|null $target
 667          */
 668         public function setTarget( $target ) {
 669                 $this->mTarget = $target;
 670         }
 671
 672         /**
 673          * Get an array of head items
 674          *
 675          * @return array
 676          */
 677         function getHeadItemsArray() {
 678                 return $this->mHeadItems;
 679         }
 680
 681         /**
 682          * Get all header items in a string
 683          *
 684          * @return string
 685          * @deprecated since 1.24 Use OutputPage::headElement or
 686          *   if absolutely necessary use OutputPage::getHeadItemsArray
 687          */
 688         function getHeadItems() {
 689                 wfDeprecated( __METHOD__, '1.24' );
 690                 $s = '';
 691                 foreach ( $this->mHeadItems as $item ) {
 692                         $s .= $item;
 693                 }
 694                 return $s;
 695         }
 696
 697         /**
 698          * Add or replace an header item to the output
 699          *
 700          * Whenever possible, use more specific options like ResourceLoader modules,
 701          * OutputPage::addLink(), OutputPage::addMetaLink() and OutputPage::addFeedLink()
 702          * Fallback options for those are: OutputPage::addStyle, OutputPage::addScript(),
 703          * OutputPage::addInlineScript() and OutputPage::addInlineStyle()
 704          * This would be your very LAST fallback.
 705          *
 706          * @param string $name Item name
 707          * @param string $value Raw HTML
 708          */
 709         public function addHeadItem( $name, $value ) {
 710                 $this->mHeadItems[$name] = $value;
 711         }
 712
 713         /**
 714          * Check if the header item $name is already set
 715          *
 716          * @param string $name Item name
 717          * @return bool
 718          */
 719         public function hasHeadItem( $name ) {
 720                 return isset( $this->mHeadItems[$name] );
 721         }
 722
 723         /**
 724          * Set the value of the ETag HTTP header, only used if $wgUseETag is true
 725          *
 726          * @param string $tag Value of "ETag" header
 727          */
 728         function setETag( $tag ) {
 729                 $this->mETag = $tag;
 730         }
 731
 732         /**
 733          * Set whether the output should only contain the body of the article,
 734          * without any skin, sidebar, etc.
 735          * Used e.g. when calling with "action=render".
 736          *
 737          * @param bool $only Whether to output only the body of the article
 738          */
 739         public function setArticleBodyOnly( $only ) {
 740                 $this->mArticleBodyOnly = $only;
 741         }
 742
 743         /**
 744          * Return whether the output will contain only the body of the article
 745          *
 746          * @return bool
 747          */
 748         public function getArticleBodyOnly() {
 749                 return $this->mArticleBodyOnly;
 750         }
 751
 752         /**
 753          * Set an additional output property
 754          * @since 1.21
 755          *
 756          * @param string $name
 757          * @param mixed $value
 758          */
 759         public function setProperty( $name, $value ) {
 760                 $this->mProperties[$name] = $value;
 761         }
 762
 763         /**
 764          * Get an additional output property
 765          * @since 1.21
 766          *
 767          * @param string $name
 768          * @return mixed Property value or null if not found
 769          */
 770         public function getProperty( $name ) {
 771                 if ( isset( $this->mProperties[$name] ) ) {
 772                         return $this->mProperties[$name];
 773                 } else {
 774                         return null;
 775                 }
 776         }
 777
 778         /**
 779          * checkLastModified tells the client to use the client-cached page if
 780          * possible. If successful, the OutputPage is disabled so that
 781          * any future call to OutputPage->output() have no effect.
 782          *
 783          * Side effect: sets mLastModified for Last-Modified header
 784          *
 785          * @param string $timestamp
 786          *
 787          * @return bool True if cache-ok headers was sent.
 788          */
 789         public function checkLastModified( $timestamp ) {
 790                 if ( !$timestamp || $timestamp == '19700101000000' ) {
 791                         wfDebug( __METHOD__ . ": CACHE DISABLED, NO TIMESTAMP\n" );
 792                         return false;
 793                 }
 794                 $config = $this->getConfig();
 795                 if ( !$config->get( 'CachePages' ) ) {
 796                         wfDebug( __METHOD__ . ": CACHE DISABLED\n" );
 797                         return false;
 798                 }
 799
 800                 $timestamp = wfTimestamp( TS_MW, $timestamp );
 801                 $modifiedTimes = [
 802                         'page' => $timestamp,
 803                         'user' => $this->getUser()->getTouched(),
 804                         'epoch' => $config->get( 'CacheEpoch' )
 805                 ];
 806                 if ( $config->get( 'UseSquid' ) ) {
 807                         // bug 44570: the core page itself may not change, but resources might
 808                         $modifiedTimes['sepoch'] = wfTimestamp( TS_MW, time() - $config->get( 'SquidMaxage' ) );
 809                 }
 810                 Hooks::run( 'OutputPageCheckLastModified', [ &$modifiedTimes ] );
 811
 812                 $maxModified = max( $modifiedTimes );
 813                 $this->mLastModified = wfTimestamp( TS_RFC2822, $maxModified );
 814
 815                 $clientHeader = $this->getRequest()->getHeader( 'If-Modified-Since' );
 816                 if ( $clientHeader === false ) {
 817                         wfDebug( __METHOD__ . ": client did not send If-Modified-Since header", 'private' );
 818                         return false;
 819                 }
 820
 821                 # IE sends sizes after the date like this:
 822                 # Wed, 20 Aug 2003 06:51:19 GMT; length=5202
 823                 # this breaks strtotime().
 824                 $clientHeader = preg_replace( '/;.*$/', '', $clientHeader );
 825
 826                 MediaWiki\suppressWarnings(); // E_STRICT system time bitching
 827                 $clientHeaderTime = strtotime( $clientHeader );
 828                 MediaWiki\restoreWarnings();
 829                 if ( !$clientHeaderTime ) {
 830                         wfDebug( __METHOD__
 831                                 . ": unable to parse the client's If-Modified-Since header: $clientHeader\n" );
 832                         return false;
 833                 }
 834                 $clientHeaderTime = wfTimestamp( TS_MW, $clientHeaderTime );
 835
 836                 # Make debug info
 837                 $info = '';
 838                 foreach ( $modifiedTimes as $name => $value ) {
 839                         if ( $info !== '' ) {
 840                                 $info .= ', ';
 841                         }
 842                         $info .= "$name=" . wfTimestamp( TS_ISO_8601, $value );
 843                 }
 844
 845                 wfDebug( __METHOD__ . ": client sent If-Modified-Since: " .
 846                         wfTimestamp( TS_ISO_8601, $clientHeaderTime ), 'private' );
 847                 wfDebug( __METHOD__ . ": effective Last-Modified: " .
 848                         wfTimestamp( TS_ISO_8601, $maxModified ), 'private' );
 849                 if ( $clientHeaderTime < $maxModified ) {
 850                         wfDebug( __METHOD__ . ": STALE, $info", 'private' );
 851                         return false;
 852                 }
 853
 854                 # Not modified
 855                 # Give a 304 Not Modified response code and disable body output
 856                 wfDebug( __METHOD__ . ": NOT MODIFIED, $info", 'private' );
 857                 ini_set( 'zlib.output_compression', 0 );
 858                 $this->getRequest()->response()->statusHeader( 304 );
 859                 $this->sendCacheControl();
 860                 $this->disable();
 861
 862                 // Don't output a compressed blob when using ob_gzhandler;
 863                 // it's technically against HTTP spec and seems to confuse
 864                 // Firefox when the response gets split over two packets.
 865                 wfClearOutputBuffers();
 866
 867                 return true;
 868         }
 869
 870         /**
 871          * Override the last modified timestamp
 872          *
 873          * @param string $timestamp New timestamp, in a format readable by
 874          *        wfTimestamp()
 875          */
 876         public function setLastModified( $timestamp ) {
 877                 $this->mLastModified = wfTimestamp( TS_RFC2822, $timestamp );
 878         }
 879
 880         /**
 881          * Set the robot policy for the page: <http://www.robotstxt.org/meta.html>
 882          *
 883          * @param string $policy The literal string to output as the contents of
 884          *   the meta tag.  Will be parsed according to the spec and output in
 885          *   standardized form.
 886          * @return null
 887          */
 888         public function setRobotPolicy( $policy ) {
 889                 $policy = Article::formatRobotPolicy( $policy );
 890
 891                 if ( isset( $policy['index'] ) ) {
 892                         $this->setIndexPolicy( $policy['index'] );
 893                 }
 894                 if ( isset( $policy['follow'] ) ) {
 895                         $this->setFollowPolicy( $policy['follow'] );
 896                 }
 897         }
 898
 899         /**
 900          * Set the index policy for the page, but leave the follow policy un-
 901          * touched.
 902          *
 903          * @param string $policy Either 'index' or 'noindex'.
 904          * @return null
 905          */
 906         public function setIndexPolicy( $policy ) {
 907                 $policy = trim( $policy );
 908                 if ( in_array( $policy, [ 'index', 'noindex' ] ) ) {
 909                         $this->mIndexPolicy = $policy;
 910                 }
 911         }
 912
 913         /**
 914          * Set the follow policy for the page, but leave the index policy un-
 915          * touched.
 916          *
 917          * @param string $policy Either 'follow' or 'nofollow'.
 918          * @return null
 919          */
 920         public function setFollowPolicy( $policy ) {
 921                 $policy = trim( $policy );
 922                 if ( in_array( $policy, [ 'follow', 'nofollow' ] ) ) {
 923                         $this->mFollowPolicy = $policy;
 924                 }
 925         }
 926
 927         /**
 928          * Set the new value of the "action text", this will be added to the
 929          * "HTML title", separated from it with " - ".
 930          *
 931          * @param string $text New value of the "action text"
 932          */
 933         public function setPageTitleActionText( $text ) {
 934                 $this->mPageTitleActionText = $text;
 935         }
 936
 937         /**
 938          * Get the value of the "action text"
 939          *
 940          * @return string
 941          */
 942         public function getPageTitleActionText() {
 943                 return $this->mPageTitleActionText;
 944         }
 945
 946         /**
 947          * "HTML title" means the contents of "<title>".
 948          * It is stored as plain, unescaped text and will be run through htmlspecialchars in the skin file.
 949          *
 950          * @param string|Message $name
 951          */
 952         public function setHTMLTitle( $name ) {
 953                 if ( $name instanceof Message ) {
 954                         $this->mHTMLtitle = $name->setContext( $this->getContext() )->text();
 955                 } else {
 956                         $this->mHTMLtitle = $name;
 957                 }
 958         }
 959
 960         /**
 961          * Return the "HTML title", i.e. the content of the "<title>" tag.
 962          *
 963          * @return string
 964          */
 965         public function getHTMLTitle() {
 966                 return $this->mHTMLtitle;
 967         }
 968
 969         /**
 970          * Set $mRedirectedFrom, the Title of the page which redirected us to the current page.
 971          *
 972          * @param Title $t
 973          */
 974         public function setRedirectedFrom( $t ) {
 975                 $this->mRedirectedFrom = $t;
 976         }
 977
 978         /**
 979          * "Page title" means the contents of \<h1\>. It is stored as a valid HTML
 980          * fragment. This function allows good tags like \<sup\> in the \<h1\> tag,
 981          * but not bad tags like \<script\>. This function automatically sets
 982          * \<title\> to the same content as \<h1\> but with all tags removed. Bad
 983          * tags that were escaped in \<h1\> will still be escaped in \<title\>, and
 984          * good tags like \<i\> will be dropped entirely.
 985          *
 986          * @param string|Message $name
 987          */
 988         public function setPageTitle( $name ) {
 989                 if ( $name instanceof Message ) {
 990                         $name = $name->setContext( $this->getContext() )->text();
 991                 }
 992
 993                 # change "<script>foo&bar</script>" to "&lt;script&gt;foo&amp;bar&lt;/script&gt;"
 994                 # but leave "<i>foobar</i>" alone
 995                 $nameWithTags = Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags( $name ) );
 996                 $this->mPagetitle = $nameWithTags;
 997
 998                 # change "<i>foo&amp;bar</i>" to "foo&bar"
 999                 $this->setHTMLTitle(
1000                         $this->msg( 'pagetitle' )->rawParams( Sanitizer::stripAllTags( $nameWithTags ) )
1001                                 ->inContentLanguage()
1002                 );
1003         }
1004
1005         /**
1006          * Return the "page title", i.e. the content of the \<h1\> tag.
1007          *
1008          * @return string
1009          */
1010         public function getPageTitle() {
1011                 return $this->mPagetitle;
1012         }
1013
1014         /**
1015          * Set the Title object to use
1016          *
1017          * @param Title $t
1018          */
1019         public function setTitle( Title $t ) {
1020                 $this->getContext()->setTitle( $t );
1021         }
1022
1023         /**
1024          * Replace the subtitle with $str
1025          *
1026          * @param string|Message $str New value of the subtitle. String should be safe HTML.
1027          */
1028         public function setSubtitle( $str ) {
1029                 $this->clearSubtitle();
1030                 $this->addSubtitle( $str );
1031         }
1032
1033         /**
1034          * Add $str to the subtitle
1035          *
1036          * @param string|Message $str String or Message to add to the subtitle. String should be safe HTML.
1037          */
1038         public function addSubtitle( $str ) {
1039                 if ( $str instanceof Message ) {
1040                         $this->mSubtitle[] = $str->setContext( $this->getContext() )->parse();
1041                 } else {
1042                         $this->mSubtitle[] = $str;
1043                 }
1044         }
1045
1046         /**
1047          * Build message object for a subtitle containing a backlink to a page
1048          *
1049          * @param Title $title Title to link to
1050          * @param array $query Array of additional parameters to include in the link
1051          * @return Message
1052          * @since 1.25
1053          */
1054         public static function buildBacklinkSubtitle( Title $title, $query = [] ) {
1055                 if ( $title->isRedirect() ) {
1056                         $query['redirect'] = 'no';
1057                 }
1058                 return wfMessage( 'backlinksubtitle' )
1059                         ->rawParams( Linker::link( $title, null, [], $query ) );
1060         }
1061
1062         /**
1063          * Add a subtitle containing a backlink to a page
1064          *
1065          * @param Title $title Title to link to
1066          * @param array $query Array of additional parameters to include in the link
1067          */
1068         public function addBacklinkSubtitle( Title $title, $query = [] ) {
1069                 $this->addSubtitle( self::buildBacklinkSubtitle( $title, $query ) );
1070         }
1071
1072         /**
1073          * Clear the subtitles
1074          */
1075         public function clearSubtitle() {
1076                 $this->mSubtitle = [];
1077         }
1078
1079         /**
1080          * Get the subtitle
1081          *
1082          * @return string
1083          */
1084         public function getSubtitle() {
1085                 return implode( "<br />\n\t\t\t\t", $this->mSubtitle );
1086         }
1087
1088         /**
1089          * Set the page as printable, i.e. it'll be displayed with all
1090          * print styles included
1091          */
1092         public function setPrintable() {
1093                 $this->mPrintable = true;
1094         }
1095
1096         /**
1097          * Return whether the page is "printable"
1098          *
1099          * @return bool
1100          */
1101         public function isPrintable() {
1102                 return $this->mPrintable;
1103         }
1104
1105         /**
1106          * Disable output completely, i.e. calling output() will have no effect
1107          */
1108         public function disable() {
1109                 $this->mDoNothing = true;
1110         }
1111
1112         /**
1113          * Return whether the output will be completely disabled
1114          *
1115          * @return bool
1116          */
1117         public function isDisabled() {
1118                 return $this->mDoNothing;
1119         }
1120
1121         /**
1122          * Show an "add new section" link?
1123          *
1124          * @return bool
1125          */
1126         public function showNewSectionLink() {
1127                 return $this->mNewSectionLink;
1128         }
1129
1130         /**
1131          * Forcibly hide the new section link?
1132          *
1133          * @return bool
1134          */
1135         public function forceHideNewSectionLink() {
1136                 return $this->mHideNewSectionLink;
1137         }
1138
1139         /**
1140          * Add or remove feed links in the page header
1141          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
1142          * for the new version
1143          * @see addFeedLink()
1144          *
1145          * @param bool $show True: add default feeds, false: remove all feeds
1146          */
1147         public function setSyndicated( $show = true ) {
1148                 if ( $show ) {
1149                         $this->setFeedAppendQuery( false );
1150                 } else {
1151                         $this->mFeedLinks = [];
1152                 }
1153         }
1154
1155         /**
1156          * Add default feeds to the page header
1157          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
1158          * for the new version
1159          * @see addFeedLink()
1160          *
1161          * @param string $val Query to append to feed links or false to output
1162          *        default links
1163          */
1164         public function setFeedAppendQuery( $val ) {
1165                 $this->mFeedLinks = [];
1166
1167                 foreach ( $this->getConfig()->get( 'AdvertisedFeedTypes' ) as $type ) {
1168                         $query = "feed=$type";
1169                         if ( is_string( $val ) ) {
1170                                 $query .= '&' . $val;
1171                         }
1172                         $this->mFeedLinks[$type] = $this->getTitle()->getLocalURL( $query );
1173                 }
1174         }
1175
1176         /**
1177          * Add a feed link to the page header
1178          *
1179          * @param string $format Feed type, should be a key of $wgFeedClasses
1180          * @param string $href URL
1181          */
1182         public function addFeedLink( $format, $href ) {
1183                 if ( in_array( $format, $this->getConfig()->get( 'AdvertisedFeedTypes' ) ) ) {
1184                         $this->mFeedLinks[$format] = $href;
1185                 }
1186         }
1187
1188         /**
1189          * Should we output feed links for this page?
1190          * @return bool
1191          */
1192         public function isSyndicated() {
1193                 return count( $this->mFeedLinks ) > 0;
1194         }
1195
1196         /**
1197          * Return URLs for each supported syndication format for this page.
1198          * @return array Associating format keys with URLs
1199          */
1200         public function getSyndicationLinks() {
1201                 return $this->mFeedLinks;
1202         }
1203
1204         /**
1205          * Will currently always return null
1206          *
1207          * @return null
1208          */
1209         public function getFeedAppendQuery() {
1210                 return $this->mFeedLinksAppendQuery;
1211         }
1212
1213         /**
1214          * Set whether the displayed content is related to the source of the
1215          * corresponding article on the wiki
1216          * Setting true will cause the change "article related" toggle to true
1217          *
1218          * @param bool $v
1219          */
1220         public function setArticleFlag( $v ) {
1221                 $this->mIsarticle = $v;
1222                 if ( $v ) {
1223                         $this->mIsArticleRelated = $v;
1224                 }
1225         }
1226
1227         /**
1228          * Return whether the content displayed page is related to the source of
1229          * the corresponding article on the wiki
1230          *
1231          * @return bool
1232          */
1233         public function isArticle() {
1234                 return $this->mIsarticle;
1235         }
1236
1237         /**
1238          * Set whether this page is related an article on the wiki
1239          * Setting false will cause the change of "article flag" toggle to false
1240          *
1241          * @param bool $v
1242          */
1243         public function setArticleRelated( $v ) {
1244                 $this->mIsArticleRelated = $v;
1245                 if ( !$v ) {
1246                         $this->mIsarticle = false;
1247                 }
1248         }
1249
1250         /**
1251          * Return whether this page is related an article on the wiki
1252          *
1253          * @return bool
1254          */
1255         public function isArticleRelated() {
1256                 return $this->mIsArticleRelated;
1257         }
1258
1259         /**
1260          * Add new language links
1261          *
1262          * @param array $newLinkArray Associative array mapping language code to the page
1263          *                      name
1264          */
1265         public function addLanguageLinks( array $newLinkArray ) {
1266                 $this->mLanguageLinks += $newLinkArray;
1267         }
1268
1269         /**
1270          * Reset the language links and add new language links
1271          *
1272          * @param array $newLinkArray Associative array mapping language code to the page
1273          *                      name
1274          */
1275         public function setLanguageLinks( array $newLinkArray ) {
1276                 $this->mLanguageLinks = $newLinkArray;
1277         }
1278
1279         /**
1280          * Get the list of language links
1281          *
1282          * @return array Array of Interwiki Prefixed (non DB key) Titles (e.g. 'fr:Test page')
1283          */
1284         public function getLanguageLinks() {
1285                 return $this->mLanguageLinks;
1286         }
1287
1288         /**
1289          * Add an array of categories, with names in the keys
1290          *
1291          * @param array $categories Mapping category name => sort key
1292          */
1293         public function addCategoryLinks( array $categories ) {
1294                 global $wgContLang;
1295
1296                 if ( !is_array( $categories ) || count( $categories ) == 0 ) {
1297                         return;
1298                 }
1299
1300                 # Add the links to a LinkBatch
1301                 $arr = [ NS_CATEGORY => $categories ];
1302                 $lb = new LinkBatch;
1303                 $lb->setArray( $arr );
1304
1305                 # Fetch existence plus the hiddencat property
1306                 $dbr = wfGetDB( DB_SLAVE );
1307                 $fields = [ 'page_id', 'page_namespace', 'page_title', 'page_len',
1308                         'page_is_redirect', 'page_latest', 'pp_value' ];
1309
1310                 if ( $this->getConfig()->get( 'ContentHandlerUseDB' ) ) {
1311                         $fields[] = 'page_content_model';
1312                 }
1313                 if ( $this->getConfig()->get( 'PageLanguageUseDB' ) ) {
1314                         $fields[] = 'page_lang';
1315                 }
1316
1317                 $res = $dbr->select( [ 'page', 'page_props' ],
1318                         $fields,
1319                         $lb->constructSet( 'page', $dbr ),
1320                         __METHOD__,
1321                         [],
1322                         [ 'page_props' => [ 'LEFT JOIN', [
1323                                 'pp_propname' => 'hiddencat',
1324                                 'pp_page = page_id'
1325                         ] ] ]
1326                 );
1327
1328                 # Add the results to the link cache
1329                 $lb->addResultToCache( LinkCache::singleton(), $res );
1330
1331                 # Set all the values to 'normal'.
1332                 $categories = array_fill_keys( array_keys( $categories ), 'normal' );
1333
1334                 # Mark hidden categories
1335                 foreach ( $res as $row ) {
1336                         if ( isset( $row->pp_value ) ) {
1337                                 $categories[$row->page_title] = 'hidden';
1338                         }
1339                 }
1340
1341                 # Add the remaining categories to the skin
1342                 if ( Hooks::run(
1343                         'OutputPageMakeCategoryLinks',
1344                         [ &$this, $categories, &$this->mCategoryLinks ] )
1345                 ) {
1346                         foreach ( $categories as $category => $type ) {
1347                                 // array keys will cast numeric category names to ints, so cast back to string
1348                                 $category = (string)$category;
1349                                 $origcategory = $category;
1350                                 $title = Title::makeTitleSafe( NS_CATEGORY, $category );
1351                                 if ( !$title ) {
1352                                         continue;
1353                                 }
1354                                 $wgContLang->findVariantLink( $category, $title, true );
1355                                 if ( $category != $origcategory && array_key_exists( $category, $categories ) ) {
1356                                         continue;
1357                                 }
1358                                 $text = $wgContLang->convertHtml( $title->getText() );
1359                                 $this->mCategories[] = $title->getText();
1360                                 $this->mCategoryLinks[$type][] = Linker::link( $title, $text );
1361                         }
1362                 }
1363         }
1364
1365         /**
1366          * Reset the category links (but not the category list) and add $categories
1367          *
1368          * @param array $categories Mapping category name => sort key
1369          */
1370         public function setCategoryLinks( array $categories ) {
1371                 $this->mCategoryLinks = [];
1372                 $this->addCategoryLinks( $categories );
1373         }
1374
1375         /**
1376          * Get the list of category links, in a 2-D array with the following format:
1377          * $arr[$type][] = $link, where $type is either "normal" or "hidden" (for
1378          * hidden categories) and $link a HTML fragment with a link to the category
1379          * page
1380          *
1381          * @return array
1382          */
1383         public function getCategoryLinks() {
1384                 return $this->mCategoryLinks;
1385         }
1386
1387         /**
1388          * Get the list of category names this page belongs to
1389          *
1390          * @return array Array of strings
1391          */
1392         public function getCategories() {
1393                 return $this->mCategories;
1394         }
1395
1396         /**
1397          * Add an array of indicators, with their identifiers as array
1398          * keys and HTML contents as values.
1399          *
1400          * In case of duplicate keys, existing values are overwritten.
1401          *
1402          * @param array $indicators
1403          * @since 1.25
1404          */
1405         public function setIndicators( array $indicators ) {
1406                 $this->mIndicators = $indicators + $this->mIndicators;
1407                 // Keep ordered by key
1408                 ksort( $this->mIndicators );
1409         }
1410
1411         /**
1412          * Get the indicators associated with this page.
1413          *
1414          * The array will be internally ordered by item keys.
1415          *
1416          * @return array Keys: identifiers, values: HTML contents
1417          * @since 1.25
1418          */
1419         public function getIndicators() {
1420                 return $this->mIndicators;
1421         }
1422
1423         /**
1424          * Adds help link with an icon via page indicators.
1425          * Link target can be overridden by a local message containing a wikilink:
1426          * the message key is: lowercase action or special page name + '-helppage'.
1427          * @param string $to Target MediaWiki.org page title or encoded URL.
1428          * @param bool $overrideBaseUrl Whether $url is a full URL, to avoid MW.o.
1429          * @since 1.25
1430          */
1431         public function addHelpLink( $to, $overrideBaseUrl = false ) {
1432                 $this->addModuleStyles( 'mediawiki.helplink' );
1433                 $text = $this->msg( 'helppage-top-gethelp' )->escaped();
1434
1435                 if ( $overrideBaseUrl ) {
1436                         $helpUrl = $to;
1437                 } else {
1438                         $toUrlencoded = wfUrlencode( str_replace( ' ', '_', $to ) );
1439                         $helpUrl = "//www.mediawiki.org/wiki/Special:MyLanguage/$toUrlencoded";
1440                 }
1441
1442                 $link = Html::rawElement(
1443                         'a',
1444                         [
1445                                 'href' => $helpUrl,
1446                                 'target' => '_blank',
1447                                 'class' => 'mw-helplink',
1448                         ],
1449                         $text
1450                 );
1451
1452                 $this->setIndicators( [ 'mw-helplink' => $link ] );
1453         }
1454
1455         /**
1456          * Do not allow scripts which can be modified by wiki users to load on this page;
1457          * only allow scripts bundled with, or generated by, the software.
1458          * Site-wide styles are controlled by a config setting, since they can be
1459          * used to create a custom skin/theme, but not user-specific ones.
1460          *
1461          * @todo this should be given a more accurate name
1462          */
1463         public function disallowUserJs() {
1464                 $this->reduceAllowedModules(
1465                         ResourceLoaderModule::TYPE_SCRIPTS,
1466                         ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL
1467                 );
1468
1469                 // Site-wide styles are controlled by a config setting, see bug 71621
1470                 // for background on why. User styles are never allowed.
1471                 if ( $this->getConfig()->get( 'AllowSiteCSSOnRestrictedPages' ) ) {
1472                         $styleOrigin = ResourceLoaderModule::ORIGIN_USER_SITEWIDE;
1473                 } else {
1474                         $styleOrigin = ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL;
1475                 }
1476                 $this->reduceAllowedModules(
1477                         ResourceLoaderModule::TYPE_STYLES,
1478                         $styleOrigin
1479                 );
1480         }
1481
1482         /**
1483          * Show what level of JavaScript / CSS untrustworthiness is allowed on this page
1484          * @see ResourceLoaderModule::$origin
1485          * @param string $type ResourceLoaderModule TYPE_ constant
1486          * @return int ResourceLoaderModule ORIGIN_ class constant
1487          */
1488         public function getAllowedModules( $type ) {
1489                 if ( $type == ResourceLoaderModule::TYPE_COMBINED ) {
1490                         return min( array_values( $this->mAllowedModules ) );
1491                 } else {
1492                         return isset( $this->mAllowedModules[$type] )
1493                                 ? $this->mAllowedModules[$type]
1494                                 : ResourceLoaderModule::ORIGIN_ALL;
1495                 }
1496         }
1497
1498         /**
1499          * Set the highest level of CSS/JS untrustworthiness allowed
1500          *
1501          * @deprecated since 1.24 Raising level of allowed untrusted content is no longer supported.
1502          *  Use reduceAllowedModules() instead
1503          * @param string $type ResourceLoaderModule TYPE_ constant
1504          * @param int $level ResourceLoaderModule class constant
1505          */
1506         public function setAllowedModules( $type, $level ) {
1507                 wfDeprecated( __METHOD__, '1.24' );
1508                 $this->reduceAllowedModules( $type, $level );
1509         }
1510
1511         /**
1512          * Limit the highest level of CSS/JS untrustworthiness allowed.
1513          *
1514          * If passed the same or a higher level than the current level of untrustworthiness set, the
1515          * level will remain unchanged.
1516          *
1517          * @param string $type
1518          * @param int $level ResourceLoaderModule class constant
1519          */
1520         public function reduceAllowedModules( $type, $level ) {
1521                 $this->mAllowedModules[$type] = min( $this->getAllowedModules( $type ), $level );
1522         }
1523
1524         /**
1525          * Prepend $text to the body HTML
1526          *
1527          * @param string $text HTML
1528          */
1529         public function prependHTML( $text ) {
1530                 $this->mBodytext = $text . $this->mBodytext;
1531         }
1532
1533         /**
1534          * Append $text to the body HTML
1535          *
1536          * @param string $text HTML
1537          */
1538         public function addHTML( $text ) {
1539                 $this->mBodytext .= $text;
1540         }
1541
1542         /**
1543          * Shortcut for adding an Html::element via addHTML.
1544          *
1545          * @since 1.19
1546          *
1547          * @param string $element
1548          * @param array $attribs
1549          * @param string $contents
1550          */
1551         public function addElement( $element, array $attribs = [], $contents = '' ) {
1552                 $this->addHTML( Html::element( $element, $attribs, $contents ) );
1553         }
1554
1555         /**
1556          * Clear the body HTML
1557          */
1558         public function clearHTML() {
1559                 $this->mBodytext = '';
1560         }
1561
1562         /**
1563          * Get the body HTML
1564          *
1565          * @return string HTML
1566          */
1567         public function getHTML() {
1568                 return $this->mBodytext;
1569         }
1570
1571         /**
1572          * Get/set the ParserOptions object to use for wikitext parsing
1573          *
1574          * @param ParserOptions|null $options Either the ParserOption to use or null to only get the
1575          *   current ParserOption object
1576          * @return ParserOptions
1577          */
1578         public function parserOptions( $options = null ) {
1579                 if ( $options !== null && !empty( $options->isBogus ) ) {
1580                         // Someone is trying to set a bogus pre-$wgUser PO. Check if it has
1581                         // been changed somehow, and keep it if so.
1582                         $anonPO = ParserOptions::newFromAnon();
1583                         $anonPO->setEditSection( false );
1584                         if ( !$options->matches( $anonPO ) ) {
1585                                 wfLogWarning( __METHOD__ . ': Setting a changed bogus ParserOptions: ' . wfGetAllCallers( 5 ) );
1586                                 $options->isBogus = false;
1587                         }
1588                 }
1589
1590                 if ( !$this->mParserOptions ) {
1591                         if ( !$this->getContext()->getUser()->isSafeToLoad() ) {
1592                                 // $wgUser isn't unstubbable yet, so don't try to get a
1593                                 // ParserOptions for it. And don't cache this ParserOptions
1594                                 // either.
1595                                 $po = ParserOptions::newFromAnon();
1596                                 $po->setEditSection( false );
1597                                 $po->isBogus = true;
1598                                 if ( $options !== null ) {
1599                                         $this->mParserOptions = empty( $options->isBogus ) ? $options : null;
1600                                 }
1601                                 return $po;
1602                         }
1603
1604                         $this->mParserOptions = ParserOptions::newFromContext( $this->getContext() );
1605                         $this->mParserOptions->setEditSection( false );
1606                 }
1607
1608                 if ( $options !== null && !empty( $options->isBogus ) ) {
1609                         // They're trying to restore the bogus pre-$wgUser PO. Do the right
1610                         // thing.
1611                         return wfSetVar( $this->mParserOptions, null, true );
1612                 } else {
1613                         return wfSetVar( $this->mParserOptions, $options );
1614                 }
1615         }
1616
1617         /**
1618          * Set the revision ID which will be seen by the wiki text parser
1619          * for things such as embedded {{REVISIONID}} variable use.
1620          *
1621          * @param int|null $revid An positive integer, or null
1622          * @return mixed Previous value
1623          */
1624         public function setRevisionId( $revid ) {
1625                 $val = is_null( $revid ) ? null : intval( $revid );
1626                 return wfSetVar( $this->mRevisionId, $val );
1627         }
1628
1629         /**
1630          * Get the displayed revision ID
1631          *
1632          * @return int
1633          */
1634         public function getRevisionId() {
1635                 return $this->mRevisionId;
1636         }
1637
1638         /**
1639          * Set the timestamp of the revision which will be displayed. This is used
1640          * to avoid a extra DB call in Skin::lastModified().
1641          *
1642          * @param string|null $timestamp
1643          * @return mixed Previous value
1644          */
1645         public function setRevisionTimestamp( $timestamp ) {
1646                 return wfSetVar( $this->mRevisionTimestamp, $timestamp );
1647         }
1648
1649         /**
1650          * Get the timestamp of displayed revision.
1651          * This will be null if not filled by setRevisionTimestamp().
1652          *
1653          * @return string|null
1654          */
1655         public function getRevisionTimestamp() {
1656                 return $this->mRevisionTimestamp;
1657         }
1658
1659         /**
1660          * Set the displayed file version
1661          *
1662          * @param File|bool $file
1663          * @return mixed Previous value
1664          */
1665         public function setFileVersion( $file ) {
1666                 $val = null;
1667                 if ( $file instanceof File && $file->exists() ) {
1668                         $val = [ 'time' => $file->getTimestamp(), 'sha1' => $file->getSha1() ];
1669                 }
1670                 return wfSetVar( $this->mFileVersion, $val, true );
1671         }
1672
1673         /**
1674          * Get the displayed file version
1675          *
1676          * @return array|null ('time' => MW timestamp, 'sha1' => sha1)
1677          */
1678         public function getFileVersion() {
1679                 return $this->mFileVersion;
1680         }
1681
1682         /**
1683          * Get the templates used on this page
1684          *
1685          * @return array (namespace => dbKey => revId)
1686          * @since 1.18
1687          */
1688         public function getTemplateIds() {
1689                 return $this->mTemplateIds;
1690         }
1691
1692         /**
1693          * Get the files used on this page
1694          *
1695          * @return array (dbKey => array('time' => MW timestamp or null, 'sha1' => sha1 or ''))
1696          * @since 1.18
1697          */
1698         public function getFileSearchOptions() {
1699                 return $this->mImageTimeKeys;
1700         }
1701
1702         /**
1703          * Convert wikitext to HTML and add it to the buffer
1704          * Default assumes that the current page title will be used.
1705          *
1706          * @param string $text
1707          * @param bool $linestart Is this the start of a line?
1708          * @param bool $interface Is this text in the user interface language?
1709          * @throws MWException
1710          */
1711         public function addWikiText( $text, $linestart = true, $interface = true ) {
1712                 $title = $this->getTitle(); // Work around E_STRICT
1713                 if ( !$title ) {
1714                         throw new MWException( 'Title is null' );
1715                 }
1716                 $this->addWikiTextTitle( $text, $title, $linestart, /*tidy*/false, $interface );
1717         }
1718
1719         /**
1720          * Add wikitext with a custom Title object
1721          *
1722          * @param string $text Wikitext
1723          * @param Title $title
1724          * @param bool $linestart Is this the start of a line?
1725          */
1726         public function addWikiTextWithTitle( $text, &$title, $linestart = true ) {
1727                 $this->addWikiTextTitle( $text, $title, $linestart );
1728         }
1729
1730         /**
1731          * Add wikitext with a custom Title object and tidy enabled.
1732          *
1733          * @param string $text Wikitext
1734          * @param Title $title
1735          * @param bool $linestart Is this the start of a line?
1736          */
1737         function addWikiTextTitleTidy( $text, &$title, $linestart = true ) {
1738                 $this->addWikiTextTitle( $text, $title, $linestart, true );
1739         }
1740
1741         /**
1742          * Add wikitext with tidy enabled
1743          *
1744          * @param string $text Wikitext
1745          * @param bool $linestart Is this the start of a line?
1746          */
1747         public function addWikiTextTidy( $text, $linestart = true ) {
1748                 $title = $this->getTitle();
1749                 $this->addWikiTextTitleTidy( $text, $title, $linestart );
1750         }
1751
1752         /**
1753          * Add wikitext with a custom Title object
1754          *
1755          * @param string $text Wikitext
1756          * @param Title $title
1757          * @param bool $linestart Is this the start of a line?
1758          * @param bool $tidy Whether to use tidy
1759          * @param bool $interface Whether it is an interface message
1760          *   (for example disables conversion)
1761          */
1762         public function addWikiTextTitle( $text, Title $title, $linestart,
1763                 $tidy = false, $interface = false
1764         ) {
1765                 global $wgParser;
1766
1767                 $popts = $this->parserOptions();
1768                 $oldTidy = $popts->setTidy( $tidy );
1769                 $popts->setInterfaceMessage( (bool)$interface );
1770
1771                 $parserOutput = $wgParser->getFreshParser()->parse(
1772                         $text, $title, $popts,
1773                         $linestart, true, $this->mRevisionId
1774                 );
1775
1776                 $popts->setTidy( $oldTidy );
1777
1778                 $this->addParserOutput( $parserOutput );
1779
1780         }
1781
1782         /**
1783          * Add a ParserOutput object, but without Html.
1784          *
1785          * @deprecated since 1.24, use addParserOutputMetadata() instead.
1786          * @param ParserOutput $parserOutput
1787          */
1788         public function addParserOutputNoText( $parserOutput ) {
1789                 wfDeprecated( __METHOD__, '1.24' );
1790                 $this->addParserOutputMetadata( $parserOutput );
1791         }
1792
1793         /**
1794          * Add all metadata associated with a ParserOutput object, but without the actual HTML. This
1795          * includes categories, language links, ResourceLoader modules, effects of certain magic words,
1796          * and so on.
1797          *
1798          * @since 1.24
1799          * @param ParserOutput $parserOutput
1800          */
1801         public function addParserOutputMetadata( $parserOutput ) {
1802                 $this->mLanguageLinks += $parserOutput->getLanguageLinks();
1803                 $this->addCategoryLinks( $parserOutput->getCategories() );
1804                 $this->setIndicators( $parserOutput->getIndicators() );
1805                 $this->mNewSectionLink = $parserOutput->getNewSection();
1806                 $this->mHideNewSectionLink = $parserOutput->getHideNewSection();
1807
1808                 if ( !$parserOutput->isCacheable() ) {
1809                         $this->enableClientCache( false );
1810                 }
1811                 $this->mNoGallery = $parserOutput->getNoGallery();
1812                 $this->mHeadItems = array_merge( $this->mHeadItems, $parserOutput->getHeadItems() );
1813                 $this->addModules( $parserOutput->getModules() );
1814                 $this->addModuleScripts( $parserOutput->getModuleScripts() );
1815                 $this->addModuleStyles( $parserOutput->getModuleStyles() );
1816                 $this->addJsConfigVars( $parserOutput->getJsConfigVars() );
1817                 $this->mPreventClickjacking = $this->mPreventClickjacking
1818                         || $parserOutput->preventClickjacking();
1819
1820                 // Template versioning...
1821                 foreach ( (array)$parserOutput->getTemplateIds() as $ns => $dbks ) {
1822                         if ( isset( $this->mTemplateIds[$ns] ) ) {
1823                                 $this->mTemplateIds[$ns] = $dbks + $this->mTemplateIds[$ns];
1824                         } else {
1825                                 $this->mTemplateIds[$ns] = $dbks;
1826                         }
1827                 }
1828                 // File versioning...
1829                 foreach ( (array)$parserOutput->getFileSearchOptions() as $dbk => $data ) {
1830                         $this->mImageTimeKeys[$dbk] = $data;
1831                 }
1832
1833                 // Hooks registered in the object
1834                 $parserOutputHooks = $this->getConfig()->get( 'ParserOutputHooks' );
1835                 foreach ( $parserOutput->getOutputHooks() as $hookInfo ) {
1836                         list( $hookName, $data ) = $hookInfo;
1837                         if ( isset( $parserOutputHooks[$hookName] ) ) {
1838                                 call_user_func( $parserOutputHooks[$hookName], $this, $parserOutput, $data );
1839                         }
1840                 }
1841
1842                 // enable OOUI if requested via ParserOutput
1843                 if ( $parserOutput->getEnableOOUI() ) {
1844                         $this->enableOOUI();
1845                 }
1846
1847                 // Link flags are ignored for now, but may in the future be
1848                 // used to mark individual language links.
1849                 $linkFlags = [];
1850                 Hooks::run( 'LanguageLinks', [ $this->getTitle(), &$this->mLanguageLinks, &$linkFlags ] );
1851                 Hooks::run( 'OutputPageParserOutput', [ &$this, $parserOutput ] );
1852         }
1853
1854         /**
1855          * Add the HTML and enhancements for it (like ResourceLoader modules) associated with a
1856          * ParserOutput object, without any other metadata.
1857          *
1858          * @since 1.24
1859          * @param ParserOutput $parserOutput
1860          */
1861         public function addParserOutputContent( $parserOutput ) {
1862                 $this->addParserOutputText( $parserOutput );
1863
1864                 $this->addModules( $parserOutput->getModules() );
1865                 $this->addModuleScripts( $parserOutput->getModuleScripts() );
1866                 $this->addModuleStyles( $parserOutput->getModuleStyles() );
1867
1868                 $this->addJsConfigVars( $parserOutput->getJsConfigVars() );
1869         }
1870
1871         /**
1872          * Add the HTML associated with a ParserOutput object, without any metadata.
1873          *
1874          * @since 1.24
1875          * @param ParserOutput $parserOutput
1876          */
1877         public function addParserOutputText( $parserOutput ) {
1878                 $text = $parserOutput->getText();
1879                 Hooks::run( 'OutputPageBeforeHTML', [ &$this, &$text ] );
1880                 $this->addHTML( $text );
1881         }
1882
1883         /**
1884          * Add everything from a ParserOutput object.
1885          *
1886          * @param ParserOutput $parserOutput
1887          */
1888         function addParserOutput( $parserOutput ) {
1889                 $this->addParserOutputMetadata( $parserOutput );
1890                 $parserOutput->setTOCEnabled( $this->mEnableTOC );
1891
1892                 // Touch section edit links only if not previously disabled
1893                 if ( $parserOutput->getEditSectionTokens() ) {
1894                         $parserOutput->setEditSectionTokens( $this->mEnableSectionEditLinks );
1895                 }
1896
1897                 $this->addParserOutputText( $parserOutput );
1898         }
1899
1900         /**
1901          * Add the output of a QuickTemplate to the output buffer
1902          *
1903          * @param QuickTemplate $template
1904          */
1905         public function addTemplate( &$template ) {
1906                 $this->addHTML( $template->getHTML() );
1907         }
1908
1909         /**
1910          * Parse wikitext and return the HTML.
1911          *
1912          * @param string $text
1913          * @param bool $linestart Is this the start of a line?
1914          * @param bool $interface Use interface language ($wgLang instead of
1915          *   $wgContLang) while parsing language sensitive magic words like GRAMMAR and PLURAL.
1916          *   This also disables LanguageConverter.
1917          * @param Language $language Target language object, will override $interface
1918          * @throws MWException
1919          * @return string HTML
1920          */
1921         public function parse( $text, $linestart = true, $interface = false, $language = null ) {
1922                 global $wgParser;
1923
1924                 if ( is_null( $this->getTitle() ) ) {
1925                         throw new MWException( 'Empty $mTitle in ' . __METHOD__ );
1926                 }
1927
1928                 $popts = $this->parserOptions();
1929                 if ( $interface ) {
1930                         $popts->setInterfaceMessage( true );
1931                 }
1932                 if ( $language !== null ) {
1933                         $oldLang = $popts->setTargetLanguage( $language );
1934                 }
1935
1936                 $parserOutput = $wgParser->getFreshParser()->parse(
1937                         $text, $this->getTitle(), $popts,
1938                         $linestart, true, $this->mRevisionId
1939                 );
1940
1941                 if ( $interface ) {
1942                         $popts->setInterfaceMessage( false );
1943                 }
1944                 if ( $language !== null ) {
1945                         $popts->setTargetLanguage( $oldLang );
1946                 }
1947
1948                 return $parserOutput->getText();
1949         }
1950
1951         /**
1952          * Parse wikitext, strip paragraphs, and return the HTML.
1953          *
1954          * @param string $text
1955          * @param bool $linestart Is this the start of a line?
1956          * @param bool $interface Use interface language ($wgLang instead of
1957          *   $wgContLang) while parsing language sensitive magic
1958          *   words like GRAMMAR and PLURAL
1959          * @return string HTML
1960          */
1961         public function parseInline( $text, $linestart = true, $interface = false ) {
1962                 $parsed = $this->parse( $text, $linestart, $interface );
1963                 return Parser::stripOuterParagraph( $parsed );
1964         }
1965
1966         /**
1967          * @param $maxage
1968          * @deprecated since 1.27 Use setCdnMaxage() instead
1969          */
1970         public function setSquidMaxage( $maxage ) {
1971                 $this->setCdnMaxage( $maxage );
1972         }
1973
1974         /**
1975          * Set the value of the "s-maxage" part of the "Cache-control" HTTP header
1976          *
1977          * @param int $maxage Maximum cache time on the CDN, in seconds.
1978          */
1979         public function setCdnMaxage( $maxage ) {
1980                 $this->mCdnMaxage = min( $maxage, $this->mCdnMaxageLimit );
1981         }
1982
1983         /**
1984          * Lower the value of the "s-maxage" part of the "Cache-control" HTTP header
1985          *
1986          * @param int $maxage Maximum cache time on the CDN, in seconds
1987          * @since 1.27
1988          */
1989         public function lowerCdnMaxage( $maxage ) {
1990                 $this->mCdnMaxageLimit = min( $maxage, $this->mCdnMaxageLimit );
1991                 $this->setCdnMaxage( $this->mCdnMaxage );
1992         }
1993
1994         /**
1995          * Use enableClientCache(false) to force it to send nocache headers
1996          *
1997          * @param bool $state
1998          *
1999          * @return bool
2000          */
2001         public function enableClientCache( $state ) {
2002                 return wfSetVar( $this->mEnableClientCache, $state );
2003         }
2004
2005         /**
2006          * Get the list of cookies that will influence on the cache
2007          *
2008          * @return array
2009          */
2010         function getCacheVaryCookies() {
2011                 static $cookies;
2012                 if ( $cookies === null ) {
2013                         $config = $this->getConfig();
2014                         $cookies = array_merge(
2015                                 SessionManager::singleton()->getVaryCookies(),
2016                                 [
2017                                         'forceHTTPS',
2018                                 ],
2019                                 $config->get( 'CacheVaryCookies' )
2020                         );
2021                         Hooks::run( 'GetCacheVaryCookies', [ $this, &$cookies ] );
2022                 }
2023                 return $cookies;
2024         }
2025
2026         /**
2027          * Check if the request has a cache-varying cookie header
2028          * If it does, it's very important that we don't allow public caching
2029          *
2030          * @return bool
2031          */
2032         function haveCacheVaryCookies() {
2033                 $request = $this->getRequest();
2034                 foreach ( $this->getCacheVaryCookies() as $cookieName ) {
2035                         if ( $request->getCookie( $cookieName, '', '' ) !== '' ) {
2036                                 wfDebug( __METHOD__ . ": found $cookieName\n" );
2037                                 return true;
2038                         }
2039                 }
2040                 wfDebug( __METHOD__ . ": no cache-varying cookies found\n" );
2041                 return false;
2042         }
2043
2044         /**
2045          * Add an HTTP header that will influence on the cache
2046          *
2047          * @param string $header Header name
2048          * @param string[]|null $option Options for the Key header. See
2049          * https://datatracker.ietf.org/doc/draft-fielding-http-key/
2050          * for the list of valid options.
2051          */
2052         public function addVaryHeader( $header, array $option = null ) {
2053                 if ( !array_key_exists( $header, $this->mVaryHeader ) ) {
2054                         $this->mVaryHeader[$header] = [];
2055                 }
2056                 if ( !is_array( $option ) ) {
2057                         $option = [];
2058                 }
2059                 $this->mVaryHeader[$header] = array_unique( array_merge( $this->mVaryHeader[$header], $option ) );
2060         }
2061
2062         /**
2063          * Return a Vary: header on which to vary caches. Based on the keys of $mVaryHeader,
2064          * such as Accept-Encoding or Cookie
2065          *
2066          * @return string
2067          */
2068         public function getVaryHeader() {
2069                 foreach ( SessionManager::singleton()->getVaryHeaders() as $header => $options ) {
2070                         $this->addVaryHeader( $header, $options );
2071                 }
2072                 return 'Vary: ' . implode( ', ', array_keys( $this->mVaryHeader ) );
2073         }
2074
2075         /**
2076          * Get a complete Key header
2077          *
2078          * @return string
2079          */
2080         public function getKeyHeader() {
2081                 $cvCookies = $this->getCacheVaryCookies();
2082
2083                 $cookiesOption = [];
2084                 foreach ( $cvCookies as $cookieName ) {
2085                         $cookiesOption[] = 'param=' . $cookieName;
2086                 }
2087                 $this->addVaryHeader( 'Cookie', $cookiesOption );
2088
2089                 foreach ( SessionManager::singleton()->getVaryHeaders() as $header => $options ) {
2090                         $this->addVaryHeader( $header, $options );
2091                 }
2092
2093                 $headers = [];
2094                 foreach ( $this->mVaryHeader as $header => $option ) {
2095                         $newheader = $header;
2096                         if ( is_array( $option ) && count( $option ) > 0 ) {
2097                                 $newheader .= ';' . implode( ';', $option );
2098                         }
2099                         $headers[] = $newheader;
2100                 }
2101                 $key = 'Key: ' . implode( ',', $headers );
2102
2103                 return $key;
2104         }
2105
2106         /**
2107          * T23672: Add Accept-Language to Vary and Key headers
2108          * if there's no 'variant' parameter existed in GET.
2109          *
2110          * For example:
2111          *   /w/index.php?title=Main_page should always be served; but
2112          *   /w/index.php?title=Main_page&variant=zh-cn should never be served.
2113          */
2114         function addAcceptLanguage() {
2115                 $title = $this->getTitle();
2116                 if ( !$title instanceof Title ) {
2117                         return;
2118                 }
2119
2120                 $lang = $title->getPageLanguage();
2121                 if ( !$this->getRequest()->getCheck( 'variant' ) && $lang->hasVariants() ) {
2122                         $variants = $lang->getVariants();
2123                         $aloption = [];
2124                         foreach ( $variants as $variant ) {
2125                                 if ( $variant === $lang->getCode() ) {
2126                                         continue;
2127                                 } else {
2128                                         $aloption[] = 'substr=' . $variant;
2129
2130                                         // IE and some other browsers use BCP 47 standards in
2131                                         // their Accept-Language header, like "zh-CN" or "zh-Hant".
2132                                         // We should handle these too.
2133                                         $variantBCP47 = wfBCP47( $variant );
2134                                         if ( $variantBCP47 !== $variant ) {
2135                                                 $aloption[] = 'substr=' . $variantBCP47;
2136                                         }
2137                                 }
2138                         }
2139                         $this->addVaryHeader( 'Accept-Language', $aloption );
2140                 }
2141         }
2142
2143         /**
2144          * Set a flag which will cause an X-Frame-Options header appropriate for
2145          * edit pages to be sent. The header value is controlled by
2146          * $wgEditPageFrameOptions.
2147          *
2148          * This is the default for special pages. If you display a CSRF-protected
2149          * form on an ordinary view page, then you need to call this function.
2150          *
2151          * @param bool $enable
2152          */
2153         public function preventClickjacking( $enable = true ) {
2154                 $this->mPreventClickjacking = $enable;
2155         }
2156
2157         /**
2158          * Turn off frame-breaking. Alias for $this->preventClickjacking(false).
2159          * This can be called from pages which do not contain any CSRF-protected
2160          * HTML form.
2161          */
2162         public function allowClickjacking() {
2163                 $this->mPreventClickjacking = false;
2164         }
2165
2166         /**
2167          * Get the prevent-clickjacking flag
2168          *
2169          * @since 1.24
2170          * @return bool
2171          */
2172         public function getPreventClickjacking() {
2173                 return $this->mPreventClickjacking;
2174         }
2175
2176         /**
2177          * Get the X-Frame-Options header value (without the name part), or false
2178          * if there isn't one. This is used by Skin to determine whether to enable
2179          * JavaScript frame-breaking, for clients that don't support X-Frame-Options.
2180          *
2181          * @return string
2182          */
2183         public function getFrameOptions() {
2184                 $config = $this->getConfig();
2185                 if ( $config->get( 'BreakFrames' ) ) {
2186                         return 'DENY';
2187                 } elseif ( $this->mPreventClickjacking && $config->get( 'EditPageFrameOptions' ) ) {
2188                         return $config->get( 'EditPageFrameOptions' );
2189                 }
2190                 return false;
2191         }
2192
2193         /**
2194          * Send cache control HTTP headers
2195          */
2196         public function sendCacheControl() {
2197                 $response = $this->getRequest()->response();
2198                 $config = $this->getConfig();
2199                 if ( $config->get( 'UseETag' ) && $this->mETag ) {
2200                         $response->header( "ETag: $this->mETag" );
2201                 }
2202
2203                 $this->addVaryHeader( 'Cookie' );
2204                 $this->addAcceptLanguage();
2205
2206                 # don't serve compressed data to clients who can't handle it
2207                 # maintain different caches for logged-in users and non-logged in ones
2208                 $response->header( $this->getVaryHeader() );
2209
2210                 if ( $config->get( 'UseKeyHeader' ) ) {
2211                         $response->header( $this->getKeyHeader() );
2212                 }
2213
2214                 if ( $this->mEnableClientCache ) {
2215                         if (
2216                                 $config->get( 'UseSquid' ) &&
2217                                 !$response->hasCookies() &&
2218                                 !SessionManager::getGlobalSession()->isPersistent() &&
2219                                 !$this->isPrintable() &&
2220                                 $this->mCdnMaxage != 0 &&
2221                                 !$this->haveCacheVaryCookies()
2222                         ) {
2223                                 if ( $config->get( 'UseESI' ) ) {
2224                                         # We'll purge the proxy cache explicitly, but require end user agents
2225                                         # to revalidate against the proxy on each visit.
2226                                         # Surrogate-Control controls our CDN, Cache-Control downstream caches
2227                                         wfDebug( __METHOD__ . ": proxy caching with ESI; {$this->mLastModified} **", 'private' );
2228                                         # start with a shorter timeout for initial testing
2229                                         # header( 'Surrogate-Control: max-age=2678400+2678400, content="ESI/1.0"');
2230                                         $response->header( 'Surrogate-Control: max-age=' . $config->get( 'SquidMaxage' )
2231                                                 . '+' . $this->mCdnMaxage . ', content="ESI/1.0"' );
2232                                         $response->header( 'Cache-Control: s-maxage=0, must-revalidate, max-age=0' );
2233                                 } else {
2234                                         # We'll purge the proxy cache for anons explicitly, but require end user agents
2235                                         # to revalidate against the proxy on each visit.
2236                                         # IMPORTANT! The CDN needs to replace the Cache-Control header with
2237                                         # Cache-Control: s-maxage=0, must-revalidate, max-age=0
2238                                         wfDebug( __METHOD__ . ": local proxy caching; {$this->mLastModified} **", 'private' );
2239                                         # start with a shorter timeout for initial testing
2240                                         # header( "Cache-Control: s-maxage=2678400, must-revalidate, max-age=0" );
2241                                         $response->header( 'Cache-Control: s-maxage=' . $this->mCdnMaxage
2242                                                 . ', must-revalidate, max-age=0' );
2243                                 }
2244                         } else {
2245                                 # We do want clients to cache if they can, but they *must* check for updates
2246                                 # on revisiting the page.
2247                                 wfDebug( __METHOD__ . ": private caching; {$this->mLastModified} **", 'private' );
2248                                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
2249                                 $response->header( "Cache-Control: private, must-revalidate, max-age=0" );
2250                         }
2251                         if ( $this->mLastModified ) {
2252                                 $response->header( "Last-Modified: {$this->mLastModified}" );
2253                         }
2254                 } else {
2255                         wfDebug( __METHOD__ . ": no caching **", 'private' );
2256
2257                         # In general, the absence of a last modified header should be enough to prevent
2258                         # the client from using its cache. We send a few other things just to make sure.
2259                         $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
2260                         $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
2261                         $response->header( 'Pragma: no-cache' );
2262                 }
2263         }
2264
2265         /**
2266          * Finally, all the text has been munged and accumulated into
2267          * the object, let's actually output it:
2268          */
2269         public function output() {
2270                 if ( $this->mDoNothing ) {
2271                         return;
2272                 }
2273
2274                 $response = $this->getRequest()->response();
2275                 $config = $this->getConfig();
2276
2277                 if ( $this->mRedirect != '' ) {
2278                         # Standards require redirect URLs to be absolute
2279                         $this->mRedirect = wfExpandUrl( $this->mRedirect, PROTO_CURRENT );
2280
2281                         $redirect = $this->mRedirect;
2282                         $code = $this->mRedirectCode;
2283
2284                         if ( Hooks::run( "BeforePageRedirect", [ $this, &$redirect, &$code ] ) ) {
2285                                 if ( $code == '301' || $code == '303' ) {
2286                                         if ( !$config->get( 'DebugRedirects' ) ) {
2287                                                 $response->statusHeader( $code );
2288                                         }
2289                                         $this->mLastModified = wfTimestamp( TS_RFC2822 );
2290                                 }
2291                                 if ( $config->get( 'VaryOnXFP' ) ) {
2292                                         $this->addVaryHeader( 'X-Forwarded-Proto' );
2293                                 }
2294                                 $this->sendCacheControl();
2295
2296                                 $response->header( "Content-Type: text/html; charset=utf-8" );
2297                                 if ( $config->get( 'DebugRedirects' ) ) {
2298                                         $url = htmlspecialchars( $redirect );
2299                                         print "<html>\n<head>\n<title>Redirect</title>\n</head>\n<body>\n";
2300                                         print "<p>Location: <a href=\"$url\">$url</a></p>\n";
2301                                         print "</body>\n</html>\n";
2302                                 } else {
2303                                         $response->header( 'Location: ' . $redirect );
2304                                 }
2305                         }
2306
2307                         return;
2308                 } elseif ( $this->mStatusCode ) {
2309                         $response->statusHeader( $this->mStatusCode );
2310                 }
2311
2312                 # Buffer output; final headers may depend on later processing
2313                 ob_start();
2314
2315                 $response->header( 'Content-type: ' . $config->get( 'MimeType' ) . '; charset=UTF-8' );
2316                 $response->header( 'Content-language: ' . $config->get( 'LanguageCode' ) );
2317
2318                 // Avoid Internet Explorer "compatibility view" in IE 8-10, so that
2319                 // jQuery etc. can work correctly.
2320                 $response->header( 'X-UA-Compatible: IE=Edge' );
2321
2322                 // Prevent framing, if requested
2323                 $frameOptions = $this->getFrameOptions();
2324                 if ( $frameOptions ) {
2325                         $response->header( "X-Frame-Options: $frameOptions" );
2326                 }
2327
2328                 if ( $this->mArticleBodyOnly ) {
2329                         echo $this->mBodytext;
2330                 } else {
2331                         $sk = $this->getSkin();
2332                         // add skin specific modules
2333                         $modules = $sk->getDefaultModules();
2334
2335                         // Enforce various default modules for all skins
2336                         $coreModules = [
2337                                 // Keep this list as small as possible
2338                                 'site',
2339                                 'mediawiki.page.startup',
2340                                 'mediawiki.user',
2341                         ];
2342
2343                         // Support for high-density display images if enabled
2344                         if ( $config->get( 'ResponsiveImages' ) ) {
2345                                 $coreModules[] = 'mediawiki.hidpi';
2346                         }
2347
2348                         $this->addModules( $coreModules );
2349                         foreach ( $modules as $group ) {
2350                                 $this->addModules( $group );
2351                         }
2352                         MWDebug::addModules( $this );
2353
2354                         // Hook that allows last minute changes to the output page, e.g.
2355                         // adding of CSS or Javascript by extensions.
2356                         Hooks::run( 'BeforePageDisplay', [ &$this, &$sk ] );
2357
2358                         $sk->outputPage();
2359                 }
2360
2361                 // This hook allows last minute changes to final overall output by modifying output buffer
2362                 Hooks::run( 'AfterFinalPageOutput', [ $this ] );
2363
2364                 $this->sendCacheControl();
2365
2366                 ob_end_flush();
2367
2368         }
2369
2370         /**
2371          * Actually output something with print.
2372          *
2373          * @param string $ins The string to output
2374          * @deprecated since 1.22 Use echo yourself.
2375          */
2376         public function out( $ins ) {
2377                 wfDeprecated( __METHOD__, '1.22' );
2378                 print $ins;
2379         }
2380
2381         /**
2382          * Prepare this object to display an error page; disable caching and
2383          * indexing, clear the current text and redirect, set the page's title
2384          * and optionally an custom HTML title (content of the "<title>" tag).
2385          *
2386          * @param string|Message $pageTitle Will be passed directly to setPageTitle()
2387          * @param string|Message $htmlTitle Will be passed directly to setHTMLTitle();
2388          *                   optional, if not passed the "<title>" attribute will be
2389          *                   based on $pageTitle
2390          */
2391         public function prepareErrorPage( $pageTitle, $htmlTitle = false ) {
2392                 $this->setPageTitle( $pageTitle );
2393                 if ( $htmlTitle !== false ) {
2394                         $this->setHTMLTitle( $htmlTitle );
2395                 }
2396                 $this->setRobotPolicy( 'noindex,nofollow' );
2397                 $this->setArticleRelated( false );
2398                 $this->enableClientCache( false );
2399                 $this->mRedirect = '';
2400                 $this->clearSubtitle();
2401                 $this->clearHTML();
2402         }
2403
2404         /**
2405          * Output a standard error page
2406          *
2407          * showErrorPage( 'titlemsg', 'pagetextmsg' );
2408          * showErrorPage( 'titlemsg', 'pagetextmsg', array( 'param1', 'param2' ) );
2409          * showErrorPage( 'titlemsg', $messageObject );
2410          * showErrorPage( $titleMessageObject, $messageObject );
2411          *
2412          * @param string|Message $title Message key (string) for page title, or a Message object
2413          * @param string|Message $msg Message key (string) for page text, or a Message object
2414          * @param array $params Message parameters; ignored if $msg is a Message object
2415          */
2416         public function showErrorPage( $title, $msg, $params = [] ) {
2417                 if ( !$title instanceof Message ) {
2418                         $title = $this->msg( $title );
2419                 }
2420
2421                 $this->prepareErrorPage( $title );
2422
2423                 if ( $msg instanceof Message ) {
2424                         if ( $params !== [] ) {
2425                                 trigger_error( 'Argument ignored: $params. The message parameters argument '
2426                                         . 'is discarded when the $msg argument is a Message object instead of '
2427                                         . 'a string.', E_USER_NOTICE );
2428                         }
2429                         $this->addHTML( $msg->parseAsBlock() );
2430                 } else {
2431                         $this->addWikiMsgArray( $msg, $params );
2432                 }
2433
2434                 $this->returnToMain();
2435         }
2436
2437         /**
2438          * Output a standard permission error page
2439          *
2440          * @param array $errors Error message keys
2441          * @param string $action Action that was denied or null if unknown
2442          */
2443         public function showPermissionsErrorPage( array $errors, $action = null ) {
2444                 // For some action (read, edit, create and upload), display a "login to do this action"
2445                 // error if all of the following conditions are met:
2446                 // 1. the user is not logged in
2447                 // 2. the only error is insufficient permissions (i.e. no block or something else)
2448                 // 3. the error can be avoided simply by logging in
2449                 if ( in_array( $action, [ 'read', 'edit', 'createpage', 'createtalk', 'upload' ] )
2450                         && $this->getUser()->isAnon() && count( $errors ) == 1 && isset( $errors[0][0] )
2451                         && ( $errors[0][0] == 'badaccess-groups' || $errors[0][0] == 'badaccess-group0' )
2452                         && ( User::groupHasPermission( 'user', $action )
2453                         || User::groupHasPermission( 'autoconfirmed', $action ) )
2454                 ) {
2455                         $displayReturnto = null;
2456
2457                         # Due to bug 32276, if a user does not have read permissions,
2458                         # $this->getTitle() will just give Special:Badtitle, which is
2459                         # not especially useful as a returnto parameter. Use the title
2460                         # from the request instead, if there was one.
2461                         $request = $this->getRequest();
2462                         $returnto = Title::newFromText( $request->getVal( 'title', '' ) );
2463                         if ( $action == 'edit' ) {
2464                                 $msg = 'whitelistedittext';
2465                                 $displayReturnto = $returnto;
2466                         } elseif ( $action == 'createpage' || $action == 'createtalk' ) {
2467                                 $msg = 'nocreatetext';
2468                         } elseif ( $action == 'upload' ) {
2469                                 $msg = 'uploadnologintext';
2470                         } else { # Read
2471                                 $msg = 'loginreqpagetext';
2472                                 $displayReturnto = Title::newMainPage();
2473                         }
2474
2475                         $query = [];
2476
2477                         if ( $returnto ) {
2478                                 $query['returnto'] = $returnto->getPrefixedText();
2479
2480                                 if ( !$request->wasPosted() ) {
2481                                         $returntoquery = $request->getValues();
2482                                         unset( $returntoquery['title'] );
2483                                         unset( $returntoquery['returnto'] );
2484                                         unset( $returntoquery['returntoquery'] );
2485                                         $query['returntoquery'] = wfArrayToCgi( $returntoquery );
2486                                 }
2487                         }
2488                         $loginLink = Linker::linkKnown(
2489                                 SpecialPage::getTitleFor( 'Userlogin' ),
2490                                 $this->msg( 'loginreqlink' )->escaped(),
2491                                 [],
2492                                 $query
2493                         );
2494
2495                         $this->prepareErrorPage( $this->msg( 'loginreqtitle' ) );
2496                         $this->addHTML( $this->msg( $msg )->rawParams( $loginLink )->parse() );
2497
2498                         # Don't return to a page the user can't read otherwise
2499                         # we'll end up in a pointless loop
2500                         if ( $displayReturnto && $displayReturnto->userCan( 'read', $this->getUser() ) ) {
2501                                 $this->returnToMain( null, $displayReturnto );
2502                         }
2503                 } else {
2504                         $this->prepareErrorPage( $this->msg( 'permissionserrors' ) );
2505                         $this->addWikiText( $this->formatPermissionsErrorMessage( $errors, $action ) );
2506                 }
2507         }
2508
2509         /**
2510          * Display an error page indicating that a given version of MediaWiki is
2511          * required to use it
2512          *
2513          * @param mixed $version The version of MediaWiki needed to use the page
2514          */
2515         public function versionRequired( $version ) {
2516                 $this->prepareErrorPage( $this->msg( 'versionrequired', $version ) );
2517
2518                 $this->addWikiMsg( 'versionrequiredtext', $version );
2519                 $this->returnToMain();
2520         }
2521
2522         /**
2523          * Format a list of error messages
2524          *
2525          * @param array $errors Array of arrays returned by Title::getUserPermissionsErrors
2526          * @param string $action Action that was denied or null if unknown
2527          * @return string The wikitext error-messages, formatted into a list.
2528          */
2529         public function formatPermissionsErrorMessage( array $errors, $action = null ) {
2530                 if ( $action == null ) {
2531                         $text = $this->msg( 'permissionserrorstext', count( $errors ) )->plain() . "\n\n";
2532                 } else {
2533                         $action_desc = $this->msg( "action-$action" )->plain();
2534                         $text = $this->msg(
2535                                 'permissionserrorstext-withaction',
2536                                 count( $errors ),
2537                                 $action_desc
2538                         )->plain() . "\n\n";
2539                 }
2540
2541                 if ( count( $errors ) > 1 ) {
2542                         $text .= '<ul class="permissions-errors">' . "\n";
2543
2544                         foreach ( $errors as $error ) {
2545                                 $text .= '<li>';
2546                                 $text .= call_user_func_array( [ $this, 'msg' ], $error )->plain();
2547                                 $text .= "</li>\n";
2548                         }
2549                         $text .= '</ul>';
2550                 } else {
2551                         $text .= "<div class=\"permissions-errors\">\n" .
2552                                         call_user_func_array( [ $this, 'msg' ], reset( $errors ) )->plain() .
2553                                         "\n</div>";
2554                 }
2555
2556                 return $text;
2557         }
2558
2559         /**
2560          * Display a page stating that the Wiki is in read-only mode.
2561          * Should only be called after wfReadOnly() has returned true.
2562          *
2563          * Historically, this function was used to show the source of the page that the user
2564          * was trying to edit and _also_ permissions error messages. The relevant code was
2565          * moved into EditPage in 1.19 (r102024 / d83c2a431c2a) and removed here in 1.25.
2566          *
2567          * @deprecated since 1.25; throw the exception directly
2568          * @throws ReadOnlyError
2569          */
2570         public function readOnlyPage() {
2571                 if ( func_num_args() > 0 ) {
2572                         throw new MWException( __METHOD__ . ' no longer accepts arguments since 1.25.' );
2573                 }
2574
2575                 throw new ReadOnlyError;
2576         }
2577
2578         /**
2579          * Turn off regular page output and return an error response
2580          * for when rate limiting has triggered.
2581          *
2582          * @deprecated since 1.25; throw the exception directly
2583          */
2584         public function rateLimited() {
2585                 wfDeprecated( __METHOD__, '1.25' );
2586                 throw new ThrottledError;
2587         }
2588
2589         /**
2590          * Show a warning about slave lag
2591          *
2592          * If the lag is higher than $wgSlaveLagCritical seconds,
2593          * then the warning is a bit more obvious. If the lag is
2594          * lower than $wgSlaveLagWarning, then no warning is shown.
2595          *
2596          * @param int $lag Slave lag
2597          */
2598         public function showLagWarning( $lag ) {
2599                 $config = $this->getConfig();
2600                 if ( $lag >= $config->get( 'SlaveLagWarning' ) ) {
2601                         $message = $lag < $config->get( 'SlaveLagCritical' )
2602                                 ? 'lag-warn-normal'
2603                                 : 'lag-warn-high';
2604                         $wrap = Html::rawElement( 'div', [ 'class' => "mw-{$message}" ], "\n$1\n" );
2605                         $this->wrapWikiMsg( "$wrap\n", [ $message, $this->getLanguage()->formatNum( $lag ) ] );
2606                 }
2607         }
2608
2609         public function showFatalError( $message ) {
2610                 $this->prepareErrorPage( $this->msg( 'internalerror' ) );
2611
2612                 $this->addHTML( $message );
2613         }
2614
2615         public function showUnexpectedValueError( $name, $val ) {
2616                 $this->showFatalError( $this->msg( 'unexpected', $name, $val )->text() );
2617         }
2618
2619         public function showFileCopyError( $old, $new ) {
2620                 $this->showFatalError( $this->msg( 'filecopyerror', $old, $new )->text() );
2621         }
2622
2623         public function showFileRenameError( $old, $new ) {
2624                 $this->showFatalError( $this->msg( 'filerenameerror', $old, $new )->text() );
2625         }
2626
2627         public function showFileDeleteError( $name ) {
2628                 $this->showFatalError( $this->msg( 'filedeleteerror', $name )->text() );
2629         }
2630
2631         public function showFileNotFoundError( $name ) {
2632                 $this->showFatalError( $this->msg( 'filenotfound', $name )->text() );
2633         }
2634
2635         /**
2636          * Add a "return to" link pointing to a specified title
2637          *
2638          * @param Title $title Title to link
2639          * @param array $query Query string parameters
2640          * @param string $text Text of the link (input is not escaped)
2641          * @param array $options Options array to pass to Linker
2642          */
2643         public function addReturnTo( $title, array $query = [], $text = null, $options = [] ) {
2644                 $link = $this->msg( 'returnto' )->rawParams(
2645                         Linker::link( $title, $text, [], $query, $options ) )->escaped();
2646                 $this->addHTML( "<p id=\"mw-returnto\">{$link}</p>\n" );
2647         }
2648
2649         /**
2650          * Add a "return to" link pointing to a specified title,
2651          * or the title indicated in the request, or else the main page
2652          *
2653          * @param mixed $unused
2654          * @param Title|string $returnto Title or String to return to
2655          * @param string $returntoquery Query string for the return to link
2656          */
2657         public function returnToMain( $unused = null, $returnto = null, $returntoquery = null ) {
2658                 if ( $returnto == null ) {
2659                         $returnto = $this->getRequest()->getText( 'returnto' );
2660                 }
2661
2662                 if ( $returntoquery == null ) {
2663                         $returntoquery = $this->getRequest()->getText( 'returntoquery' );
2664                 }
2665
2666                 if ( $returnto === '' ) {
2667                         $returnto = Title::newMainPage();
2668                 }
2669
2670                 if ( is_object( $returnto ) ) {
2671                         $titleObj = $returnto;
2672                 } else {
2673                         $titleObj = Title::newFromText( $returnto );
2674                 }
2675                 if ( !is_object( $titleObj ) ) {
2676                         $titleObj = Title::newMainPage();
2677                 }
2678
2679                 $this->addReturnTo( $titleObj, wfCgiToArray( $returntoquery ) );
2680         }
2681
2682         /**
2683          * @param Skin $sk The given Skin
2684          * @param bool $includeStyle Unused
2685          * @return string The doctype, opening "<html>", and head element.
2686          */
2687         public function headElement( Skin $sk, $includeStyle = true ) {
2688                 global $wgContLang;
2689
2690                 $userdir = $this->getLanguage()->getDir();
2691                 $sitedir = $wgContLang->getDir();
2692
2693                 $ret = Html::htmlHeader( $sk->getHtmlElementAttributes() );
2694
2695                 if ( $this->getHTMLTitle() == '' ) {
2696                         $this->setHTMLTitle( $this->msg( 'pagetitle', $this->getPageTitle() )->inContentLanguage() );
2697                 }
2698
2699                 $openHead = Html::openElement( 'head' );
2700                 if ( $openHead ) {
2701                         # Don't bother with the newline if $head == ''
2702                         $ret .= "$openHead\n";
2703                 }
2704
2705                 if ( !Html::isXmlMimeType( $this->getConfig()->get( 'MimeType' ) ) ) {
2706                         // Add <meta charset="UTF-8">
2707                         // This should be before <title> since it defines the charset used by
2708                         // text including the text inside <title>.
2709                         // The spec recommends defining XHTML5's charset using the XML declaration
2710                         // instead of meta.
2711                         // Our XML declaration is output by Html::htmlHeader.
2712                         // http://www.whatwg.org/html/semantics.html#attr-meta-http-equiv-content-type
2713                         // http://www.whatwg.org/html/semantics.html#charset
2714                         $ret .= Html::element( 'meta', [ 'charset' => 'UTF-8' ] ) . "\n";
2715                 }
2716
2717                 $ret .= Html::element( 'title', null, $this->getHTMLTitle() ) . "\n";
2718                 $ret .= $this->getInlineHeadScripts() . "\n";
2719                 $ret .= $this->buildCssLinks() . "\n";
2720                 $ret .= $this->getExternalHeadScripts() . "\n";
2721
2722                 foreach ( $this->getHeadLinksArray() as $item ) {
2723                         $ret .= $item . "\n";
2724                 }
2725
2726                 foreach ( $this->mHeadItems as $item ) {
2727                         $ret .= $item . "\n";
2728                 }
2729
2730                 $closeHead = Html::closeElement( 'head' );
2731                 if ( $closeHead ) {
2732                         $ret .= "$closeHead\n";
2733                 }
2734
2735                 $bodyClasses = [];
2736                 $bodyClasses[] = 'mediawiki';
2737
2738                 # Classes for LTR/RTL directionality support
2739                 $bodyClasses[] = $userdir;
2740                 $bodyClasses[] = "sitedir-$sitedir";
2741
2742                 if ( $this->getLanguage()->capitalizeAllNouns() ) {
2743                         # A <body> class is probably not the best way to do this . . .
2744                         $bodyClasses[] = 'capitalize-all-nouns';
2745                 }
2746
2747                 $bodyClasses[] = $sk->getPageClasses( $this->getTitle() );
2748                 $bodyClasses[] = 'skin-' . Sanitizer::escapeClass( $sk->getSkinName() );
2749                 $bodyClasses[] =
2750                         'action-' . Sanitizer::escapeClass( Action::getActionName( $this->getContext() ) );
2751
2752                 $bodyAttrs = [];
2753                 // While the implode() is not strictly needed, it's used for backwards compatibility
2754                 // (this used to be built as a string and hooks likely still expect that).
2755                 $bodyAttrs['class'] = implode( ' ', $bodyClasses );
2756
2757                 // Allow skins and extensions to add body attributes they need
2758                 $sk->addToBodyAttributes( $this, $bodyAttrs );
2759                 Hooks::run( 'OutputPageBodyAttributes', [ $this, $sk, &$bodyAttrs ] );
2760
2761                 $ret .= Html::openElement( 'body', $bodyAttrs ) . "\n";
2762
2763                 return $ret;
2764         }
2765
2766         /**
2767          * Get a ResourceLoader object associated with this OutputPage
2768          *
2769          * @return ResourceLoader
2770          */
2771         public function getResourceLoader() {
2772                 if ( is_null( $this->mResourceLoader ) ) {
2773                         $this->mResourceLoader = new ResourceLoader(
2774                                 $this->getConfig(),
2775                                 LoggerFactory::getInstance( 'resourceloader' )
2776                         );
2777                 }
2778                 return $this->mResourceLoader;
2779         }
2780
2781         /**
2782          * Construct neccecary html and loader preset states to load modules on a page.
2783          *
2784          * Use getHtmlFromLoaderLinks() to convert this array to HTML.
2785          *
2786          * @param array|string $modules One or more module names
2787          * @param string $only ResourceLoaderModule TYPE_ class constant
2788          * @param array $extraQuery [optional] Array with extra query parameters for the request
2789          * @return array A list of HTML strings and array of client loader preset states
2790          */
2791         public function makeResourceLoaderLink( $modules, $only, array $extraQuery = [] ) {
2792                 $modules = (array)$modules;
2793
2794                 $links = [
2795                         // List of html strings
2796                         'html' => [],
2797                         // Associative array of module names and their states
2798                         'states' => [],
2799                 ];
2800
2801                 if ( !count( $modules ) ) {
2802                         return $links;
2803                 }
2804
2805                 if ( count( $modules ) > 1 ) {
2806                         // Remove duplicate module requests
2807                         $modules = array_unique( $modules );
2808                         // Sort module names so requests are more uniform
2809                         sort( $modules );
2810
2811                         if ( ResourceLoader::inDebugMode() ) {
2812                                 // Recursively call us for every item
2813                                 foreach ( $modules as $name ) {
2814                                         $link = $this->makeResourceLoaderLink( $name, $only, $extraQuery );
2815                                         $links['html'] = array_merge( $links['html'], $link['html'] );
2816                                         $links['states'] += $link['states'];
2817                                 }
2818                                 return $links;
2819                         }
2820                 }
2821
2822                 if ( !is_null( $this->mTarget ) ) {
2823                         $extraQuery['target'] = $this->mTarget;
2824                 }
2825
2826                 // Create keyed-by-source and then keyed-by-group list of module objects from modules list
2827                 $sortedModules = [];
2828                 $resourceLoader = $this->getResourceLoader();
2829                 foreach ( $modules as $name ) {
2830                         $module = $resourceLoader->getModule( $name );
2831                         # Check that we're allowed to include this module on this page
2832                         if ( !$module
2833                                 || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_SCRIPTS )
2834                                         && $only == ResourceLoaderModule::TYPE_SCRIPTS )
2835                                 || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_STYLES )
2836                                         && $only == ResourceLoaderModule::TYPE_STYLES )
2837                                 || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_COMBINED )
2838                                         && $only == ResourceLoaderModule::TYPE_COMBINED )
2839                                 || ( $this->mTarget && !in_array( $this->mTarget, $module->getTargets() ) )
2840                         ) {
2841                                 continue;
2842                         }
2843
2844                         $sortedModules[$module->getSource()][$module->getGroup()][$name] = $module;
2845                 }
2846
2847                 foreach ( $sortedModules as $source => $groups ) {
2848                         foreach ( $groups as $group => $grpModules ) {
2849                                 // Special handling for user-specific groups
2850                                 $user = null;
2851                                 if ( ( $group === 'user' || $group === 'private' ) && $this->getUser()->isLoggedIn() ) {
2852                                         $user = $this->getUser()->getName();
2853                                 }
2854
2855                                 // Create a fake request based on the one we are about to make so modules return
2856                                 // correct timestamp and emptiness data
2857                                 $query = ResourceLoader::makeLoaderQuery(
2858                                         [], // modules; not determined yet
2859                                         $this->getLanguage()->getCode(),
2860                                         $this->getSkin()->getSkinName(),
2861                                         $user,
2862                                         null, // version; not determined yet
2863                                         ResourceLoader::inDebugMode(),
2864                                         $only === ResourceLoaderModule::TYPE_COMBINED ? null : $only,
2865                                         $this->isPrintable(),
2866                                         $this->getRequest()->getBool( 'handheld' ),
2867                                         $extraQuery
2868                                 );
2869                                 $context = new ResourceLoaderContext( $resourceLoader, new FauxRequest( $query ) );
2870
2871                                 // Extract modules that know they're empty and see if we have one or more
2872                                 // raw modules
2873                                 $isRaw = false;
2874                                 foreach ( $grpModules as $key => $module ) {
2875                                         // Inline empty modules: since they're empty, just mark them as 'ready' (bug 46857)
2876                                         // If we're only getting the styles, we don't need to do anything for empty modules.
2877                                         if ( $module->isKnownEmpty( $context ) ) {
2878                                                 unset( $grpModules[$key] );
2879                                                 if ( $only !== ResourceLoaderModule::TYPE_STYLES ) {
2880                                                         $links['states'][$key] = 'ready';
2881                                                 }
2882                                         }
2883
2884                                         $isRaw |= $module->isRaw();
2885                                 }
2886
2887                                 // If there are no non-empty modules, skip this group
2888                                 if ( count( $grpModules ) === 0 ) {
2889                                         continue;
2890                                 }
2891
2892                                 // Inline private modules. These can't be loaded through load.php for security
2893                                 // reasons, see bug 34907. Note that these modules should be loaded from
2894                                 // getExternalHeadScripts() before the first loader call. Otherwise other modules can't
2895                                 // properly use them as dependencies (bug 30914)
2896                                 if ( $group === 'private' ) {
2897                                         if ( $only == ResourceLoaderModule::TYPE_STYLES ) {
2898                                                 $links['html'][] = Html::inlineStyle(
2899                                                         $resourceLoader->makeModuleResponse( $context, $grpModules )
2900                                                 );
2901                                         } else {
2902                                                 $links['html'][] = ResourceLoader::makeInlineScript(
2903                                                         $resourceLoader->makeModuleResponse( $context, $grpModules )
2904                                                 );
2905                                         }
2906                                         continue;
2907                                 }
2908
2909                                 // Special handling for the user group; because users might change their stuff
2910                                 // on-wiki like user pages, or user preferences; we need to find the highest
2911                                 // timestamp of these user-changeable modules so we can ensure cache misses on change
2912                                 // This should NOT be done for the site group (bug 27564) because anons get that too
2913                                 // and we shouldn't be putting timestamps in CDN-cached HTML
2914                                 $version = null;
2915                                 if ( $group === 'user' ) {
2916                                         $query['version'] = $resourceLoader->getCombinedVersion( $context, array_keys( $grpModules ) );
2917                                 }
2918
2919                                 $query['modules'] = ResourceLoader::makePackedModulesString( array_keys( $grpModules ) );
2920                                 $moduleContext = new ResourceLoaderContext( $resourceLoader, new FauxRequest( $query ) );
2921                                 $url = $resourceLoader->createLoaderURL( $source, $moduleContext, $extraQuery );
2922
2923                                 // Automatically select style/script elements
2924                                 if ( $only === ResourceLoaderModule::TYPE_STYLES ) {
2925                                         $link = Html::linkedStyle( $url );
2926                                 } else {
2927                                         if ( $context->getRaw() || $isRaw ) {
2928                                                 // Startup module can't load itself, needs to use <script> instead of mw.loader.load
2929                                                 $link = Html::element( 'script', [
2930                                                         // In SpecialJavaScriptTest, QUnit must load synchronous
2931                                                         'async' => !isset( $extraQuery['sync'] ),
2932                                                         'src' => $url
2933                                                 ] );
2934                                         } else {
2935                                                 $link = ResourceLoader::makeInlineScript(
2936                                                         Xml::encodeJsCall( 'mw.loader.load', [ $url ] )
2937                                                 );
2938                                         }
2939
2940                                         // For modules requested directly in the html via <script> or mw.loader.load
2941                                         // tell mw.loader they are being loading to prevent duplicate requests.
2942                                         foreach ( $grpModules as $key => $module ) {
2943                                                 // Don't output state=loading for the startup module.
2944                                                 if ( $key !== 'startup' ) {
2945                                                         $links['states'][$key] = 'loading';
2946                                                 }
2947                                         }
2948                                 }
2949
2950                                 if ( $group == 'noscript' ) {
2951                                         $links['html'][] = Html::rawElement( 'noscript', [], $link );
2952                                 } else {
2953                                         $links['html'][] = $link;
2954                                 }
2955                         }
2956                 }
2957
2958                 return $links;
2959         }
2960
2961         /**
2962          * Build html output from an array of links from makeResourceLoaderLink.
2963          * @param array $links
2964          * @return string HTML
2965          */
2966         protected static function getHtmlFromLoaderLinks( array $links ) {
2967                 $html = [];
2968                 $states = [];
2969                 foreach ( $links as $link ) {
2970                         if ( !is_array( $link ) ) {
2971                                 $html[] = $link;
2972                         } else {
2973                                 $html = array_merge( $html, $link['html'] );
2974                                 $states += $link['states'];
2975                         }
2976                 }
2977                 // Filter out empty values
2978                 $html = array_filter( $html, 'strlen' );
2979
2980                 if ( count( $states ) ) {
2981                         array_unshift( $html, ResourceLoader::makeInlineScript(
2982                                 ResourceLoader::makeLoaderStateScript( $states )
2983                         ) );
2984                 }
2985
2986                 return WrappedString::join( "\n", $html );
2987         }
2988
2989         /**
2990          * JS stuff to put in the "<head>". This is the startup module, config
2991          * vars and modules marked with position 'top'
2992          *
2993          * @return string HTML fragment
2994          */
2995         function getHeadScripts() {
2996                 return $this->getInlineHeadScripts() . "\n" . $this->getExternalHeadScripts();
2997         }
2998
2999         /**
3000          * <script src="..."> tags for "<head>". This is the startup module
3001          * and other modules marked with position 'top'.
3002          *
3003          * @return string HTML fragment
3004          */
3005         function getExternalHeadScripts() {
3006                 $links = [];
3007
3008                 // Startup - this provides the client with the module
3009                 // manifest and loads jquery and mediawiki base modules
3010                 $links[] = $this->makeResourceLoaderLink( 'startup', ResourceLoaderModule::TYPE_SCRIPTS );
3011
3012                 return self::getHtmlFromLoaderLinks( $links );
3013         }
3014
3015         /**
3016          * <script>...</script> tags to put in "<head>".
3017          *
3018          * @return string HTML fragment
3019          */
3020         function getInlineHeadScripts() {
3021                 $links = [];
3022
3023                 // Client profile classes for <html>. Allows for easy hiding/showing of UI components.
3024                 // Must be done synchronously on every page to avoid flashes of wrong content.
3025                 // Note: This class distinguishes MediaWiki-supported JavaScript from the rest.
3026                 // The "rest" includes browsers that support JavaScript but not supported by our runtime.
3027                 // For the performance benefit of the majority, this is added unconditionally here and is
3028                 // then fixed up by the startup module for unsupported browsers.
3029                 $links[] = Html::inlineScript(
3030                         'document.documentElement.className = document.documentElement.className'
3031                         . '.replace( /(^|\s)client-nojs(\s|$)/, "$1client-js$2" );'
3032                 );
3033
3034                 // Load config before anything else
3035                 $links[] = ResourceLoader::makeInlineScript(
3036                         ResourceLoader::makeConfigSetScript( $this->getJSVars() )
3037                 );
3038
3039                 // Load embeddable private modules before any loader links
3040                 // This needs to be TYPE_COMBINED so these modules are properly wrapped
3041                 // in mw.loader.implement() calls and deferred until mw.user is available
3042                 $embedScripts = [ 'user.options' ];
3043                 $links[] = $this->makeResourceLoaderLink(
3044                         $embedScripts,
3045                         ResourceLoaderModule::TYPE_COMBINED
3046                 );
3047                 // Separate user.tokens as otherwise caching will be allowed (T84960)
3048                 $links[] = $this->makeResourceLoaderLink(
3049                         'user.tokens',
3050                         ResourceLoaderModule::TYPE_COMBINED
3051                 );
3052
3053                 // Modules requests - let the client calculate dependencies and batch requests as it likes
3054                 // Only load modules that have marked themselves for loading at the top
3055                 $modules = $this->getModules( true, 'top' );
3056                 if ( $modules ) {
3057                         $links[] = ResourceLoader::makeInlineScript(
3058                                 Xml::encodeJsCall( 'mw.loader.load', [ $modules ] )
3059                         );
3060                 }
3061
3062                 // "Scripts only" modules marked for top inclusion
3063                 $links[] = $this->makeResourceLoaderLink(
3064                         $this->getModuleScripts( true, 'top' ),
3065                         ResourceLoaderModule::TYPE_SCRIPTS
3066                 );
3067
3068                 return self::getHtmlFromLoaderLinks( $links );
3069         }
3070
3071         /**
3072          * JS stuff to put at the 'bottom', which goes at the bottom of the `<body>`.
3073          * These are modules marked with position 'bottom', legacy scripts ($this->mScripts),
3074          * site JS, and user JS.
3075          *
3076          * @param bool $unused Previously used to let this method change its output based
3077          *  on whether it was called by getExternalHeadScripts() or getBottomScripts().
3078          * @return string
3079          */
3080         function getScriptsForBottomQueue( $unused = null ) {
3081                 // Scripts "only" requests marked for bottom inclusion
3082                 // If we're in the <head>, use load() calls rather than <script src="..."> tags
3083                 $links = [];
3084
3085                 $links[] = $this->makeResourceLoaderLink( $this->getModuleScripts( true, 'bottom' ),
3086                         ResourceLoaderModule::TYPE_SCRIPTS
3087                 );
3088
3089                 // Modules requests - let the client calculate dependencies and batch requests as it likes
3090                 // Only load modules that have marked themselves for loading at the bottom
3091                 $modules = $this->getModules( true, 'bottom' );
3092                 if ( $modules ) {
3093                         $links[] = ResourceLoader::makeInlineScript(
3094                                 Xml::encodeJsCall( 'mw.loader.load', [ $modules ] )
3095                         );
3096                 }
3097
3098                 // Legacy Scripts
3099                 $links[] = $this->mScripts;
3100
3101                 // Add user JS if enabled
3102                 // This must use TYPE_COMBINED instead of only=scripts so that its request is handled by
3103                 // mw.loader.implement() which ensures that execution is scheduled after the "site" module.
3104                 if ( $this->getConfig()->get( 'AllowUserJs' )
3105                         && $this->getUser()->isLoggedIn()
3106                         && $this->getTitle()
3107                         && $this->getTitle()->isJsSubpage()
3108                         && $this->userCanPreview()
3109                 ) {
3110                         // We're on a preview of a JS subpage. Exclude this page from the user module (T28283)
3111                         // and include the draft contents as a raw script instead.
3112                         $links[] = $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_COMBINED,
3113                                 [ 'excludepage' => $this->getTitle()->getPrefixedDBkey() ]
3114                         );
3115                         // Load the previewed JS
3116                         $links[] = ResourceLoader::makeInlineScript(
3117                                 Xml::encodeJsCall( 'mw.loader.using', [
3118                                         [ 'user', 'site' ],
3119                                         new XmlJsCode(
3120                                                 'function () {'
3121                                                         . Xml::encodeJsCall( '$.globalEval', [
3122                                                                 $this->getRequest()->getText( 'wpTextbox1' )
3123                                                         ] )
3124                                                         . '}'
3125                                         )
3126                                 ] )
3127                         );
3128
3129                         // FIXME: If the user is previewing, say, ./vector.js, his ./common.js will be loaded
3130                         // asynchronously and may arrive *after* the inline script here. So the previewed code
3131                         // may execute before ./common.js runs. Normally, ./common.js runs before ./vector.js.
3132                         // Similarly, when previewing ./common.js and the user module does arrive first,
3133                         // it will arrive without common.js and the inline script runs after.
3134                         // Thus running common after the excluded subpage.
3135                 } else {
3136                         // Include the user module normally, i.e., raw to avoid it being wrapped in a closure.
3137                         $links[] = $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_COMBINED );
3138                 }
3139
3140                 // Group JS is only enabled if site JS is enabled.
3141                 $links[] = $this->makeResourceLoaderLink(
3142                         'user.groups',
3143                         ResourceLoaderModule::TYPE_COMBINED
3144                 );
3145
3146                 return self::getHtmlFromLoaderLinks( $links );
3147         }
3148
3149         /**
3150          * JS stuff to put at the bottom of the "<body>"
3151          * @return string
3152          */
3153         function getBottomScripts() {
3154                 return $this->getScriptsForBottomQueue();
3155         }
3156
3157         /**
3158          * Get the javascript config vars to include on this page
3159          *
3160          * @return array Array of javascript config vars
3161          * @since 1.23
3162          */
3163         public function getJsConfigVars() {
3164                 return $this->mJsConfigVars;
3165         }
3166
3167         /**
3168          * Add one or more variables to be set in mw.config in JavaScript
3169          *
3170          * @param string|array $keys Key or array of key/value pairs
3171          * @param mixed $value [optional] Value of the configuration variable
3172          */
3173         public function addJsConfigVars( $keys, $value = null ) {
3174                 if ( is_array( $keys ) ) {
3175                         foreach ( $keys as $key => $value ) {
3176                                 $this->mJsConfigVars[$key] = $value;
3177                         }
3178                         return;
3179                 }
3180
3181                 $this->mJsConfigVars[$keys] = $value;
3182         }
3183
3184         /**
3185          * Get an array containing the variables to be set in mw.config in JavaScript.
3186          *
3187          * Do not add things here which can be evaluated in ResourceLoaderStartUpModule
3188          * - in other words, page-independent/site-wide variables (without state).
3189          * You will only be adding bloat to the html page and causing page caches to
3190          * have to be purged on configuration changes.
3191          * @return array
3192          */
3193         public function getJSVars() {
3194                 global $wgContLang;
3195
3196                 $curRevisionId = 0;
3197                 $articleId = 0;
3198                 $canonicalSpecialPageName = false; # bug 21115
3199
3200                 $title = $this->getTitle();
3201                 $ns = $title->getNamespace();
3202                 $canonicalNamespace = MWNamespace::exists( $ns )
3203                         ? MWNamespace::getCanonicalName( $ns )
3204                         : $title->getNsText();
3205
3206                 $sk = $this->getSkin();
3207                 // Get the relevant title so that AJAX features can use the correct page name
3208                 // when making API requests from certain special pages (bug 34972).
3209                 $relevantTitle = $sk->getRelevantTitle();
3210                 $relevantUser = $sk->getRelevantUser();
3211
3212                 if ( $ns == NS_SPECIAL ) {
3213                         list( $canonicalSpecialPageName, /*...*/ ) =
3214                                 SpecialPageFactory::resolveAlias( $title->getDBkey() );
3215                 } elseif ( $this->canUseWikiPage() ) {
3216                         $wikiPage = $this->getWikiPage();
3217                         $curRevisionId = $wikiPage->getLatest();
3218                         $articleId = $wikiPage->getId();
3219                 }
3220
3221                 $lang = $title->getPageLanguage();
3222
3223                 // Pre-process information
3224                 $separatorTransTable = $lang->separatorTransformTable();
3225                 $separatorTransTable = $separatorTransTable ? $separatorTransTable : [];
3226                 $compactSeparatorTransTable = [
3227                         implode( "\t", array_keys( $separatorTransTable ) ),
3228                         implode( "\t", $separatorTransTable ),
3229                 ];
3230                 $digitTransTable = $lang->digitTransformTable();
3231                 $digitTransTable = $digitTransTable ? $digitTransTable : [];
3232                 $compactDigitTransTable = [
3233                         implode( "\t", array_keys( $digitTransTable ) ),
3234                         implode( "\t", $digitTransTable ),
3235                 ];
3236
3237                 $user = $this->getUser();
3238
3239                 $vars = [
3240                         'wgCanonicalNamespace' => $canonicalNamespace,
3241                         'wgCanonicalSpecialPageName' => $canonicalSpecialPageName,
3242                         'wgNamespaceNumber' => $title->getNamespace(),
3243                         'wgPageName' => $title->getPrefixedDBkey(),
3244                         'wgTitle' => $title->getText(),
3245                         'wgCurRevisionId' => $curRevisionId,
3246                         'wgRevisionId' => (int)$this->getRevisionId(),
3247                         'wgArticleId' => $articleId,
3248                         'wgIsArticle' => $this->isArticle(),
3249                         'wgIsRedirect' => $title->isRedirect(),
3250                         'wgAction' => Action::getActionName( $this->getContext() ),
3251                         'wgUserName' => $user->isAnon() ? null : $user->getName(),
3252                         'wgUserGroups' => $user->getEffectiveGroups(),
3253                         'wgCategories' => $this->getCategories(),
3254                         'wgBreakFrames' => $this->getFrameOptions() == 'DENY',
3255                         'wgPageContentLanguage' => $lang->getCode(),
3256                         'wgPageContentModel' => $title->getContentModel(),
3257                         'wgSeparatorTransformTable' => $compactSeparatorTransTable,
3258                         'wgDigitTransformTable' => $compactDigitTransTable,
3259                         'wgDefaultDateFormat' => $lang->getDefaultDateFormat(),
3260                         'wgMonthNames' => $lang->getMonthNamesArray(),
3261                         'wgMonthNamesShort' => $lang->getMonthAbbreviationsArray(),
3262                         'wgRelevantPageName' => $relevantTitle->getPrefixedDBkey(),
3263                         'wgRelevantArticleId' => $relevantTitle->getArticleId(),
3264                 ];
3265
3266                 if ( $user->isLoggedIn() ) {
3267                         $vars['wgUserId'] = $user->getId();
3268                         $vars['wgUserEditCount'] = $user->getEditCount();
3269                         $userReg = wfTimestampOrNull( TS_UNIX, $user->getRegistration() );
3270                         $vars['wgUserRegistration'] = $userReg !== null ? ( $userReg * 1000 ) : null;
3271                         // Get the revision ID of the oldest new message on the user's talk
3272                         // page. This can be used for constructing new message alerts on
3273                         // the client side.
3274                         $vars['wgUserNewMsgRevisionId'] = $user->getNewMessageRevisionId();
3275                 }
3276
3277                 if ( $wgContLang->hasVariants() ) {
3278                         $vars['wgUserVariant'] = $wgContLang->getPreferredVariant();
3279                 }
3280                 // Same test as SkinTemplate
3281                 $vars['wgIsProbablyEditable'] = $title->quickUserCan( 'edit', $user )
3282                         && ( $title->exists() || $title->quickUserCan( 'create', $user ) );
3283
3284                 foreach ( $title->getRestrictionTypes() as $type ) {
3285                         $vars['wgRestriction' . ucfirst( $type )] = $title->getRestrictions( $type );
3286                 }
3287
3288                 if ( $title->isMainPage() ) {
3289                         $vars['wgIsMainPage'] = true;
3290                 }
3291
3292                 if ( $this->mRedirectedFrom ) {
3293                         $vars['wgRedirectedFrom'] = $this->mRedirectedFrom->getPrefixedDBkey();
3294                 }
3295
3296                 if ( $relevantUser ) {
3297                         $vars['wgRelevantUserName'] = $relevantUser->getName();
3298                 }
3299
3300                 // Allow extensions to add their custom variables to the mw.config map.
3301                 // Use the 'ResourceLoaderGetConfigVars' hook if the variable is not
3302                 // page-dependant but site-wide (without state).
3303                 // Alternatively, you may want to use OutputPage->addJsConfigVars() instead.
3304                 Hooks::run( 'MakeGlobalVariablesScript', [ &$vars, $this ] );
3305
3306                 // Merge in variables from addJsConfigVars last
3307                 return array_merge( $vars, $this->getJsConfigVars() );
3308         }
3309
3310         /**
3311          * To make it harder for someone to slip a user a fake
3312          * user-JavaScript or user-CSS preview, a random token
3313          * is associated with the login session. If it's not
3314          * passed back with the preview request, we won't render
3315          * the code.
3316          *
3317          * @return bool
3318          */
3319         public function userCanPreview() {
3320                 $request = $this->getRequest();
3321                 if (
3322                         $request->getVal( 'action' ) !== 'submit' ||
3323                         !$request->getCheck( 'wpPreview' ) ||
3324                         !$request->wasPosted()
3325                 ) {
3326                         return false;
3327                 }
3328
3329                 $user = $this->getUser();
3330                 if ( !$user->matchEditToken( $request->getVal( 'wpEditToken' ) ) ) {
3331                         return false;
3332                 }
3333
3334                 $title = $this->getTitle();
3335                 if ( !$title->isJsSubpage() && !$title->isCssSubpage() ) {
3336                         return false;
3337                 }
3338                 if ( !$title->isSubpageOf( $user->getUserPage() ) ) {
3339                         // Don't execute another user's CSS or JS on preview (T85855)
3340                         return false;
3341                 }
3342
3343                 $errors = $title->getUserPermissionsErrors( 'edit', $user );
3344                 if ( count( $errors ) !== 0 ) {
3345                         return false;
3346                 }
3347
3348                 return true;
3349         }
3350
3351         /**
3352          * @return array Array in format "link name or number => 'link html'".
3353          */
3354         public function getHeadLinksArray() {
3355                 global $wgVersion;
3356
3357                 $tags = [];
3358                 $config = $this->getConfig();
3359
3360                 $canonicalUrl = $this->mCanonicalUrl;
3361
3362                 $tags['meta-generator'] = Html::element( 'meta', [
3363                         'name' => 'generator',
3364                         'content' => "MediaWiki $wgVersion",
3365                 ] );
3366
3367                 if ( $config->get( 'ReferrerPolicy' ) !== false ) {
3368                         $tags['meta-referrer'] = Html::element( 'meta', [
3369                                 'name' => 'referrer',
3370                                 'content' => $config->get( 'ReferrerPolicy' )
3371                         ] );
3372                 }
3373
3374                 $p = "{$this->mIndexPolicy},{$this->mFollowPolicy}";
3375                 if ( $p !== 'index,follow' ) {
3376                         // http://www.robotstxt.org/wc/meta-user.html
3377                         // Only show if it's different from the default robots policy
3378                         $tags['meta-robots'] = Html::element( 'meta', [
3379                                 'name' => 'robots',
3380                                 'content' => $p,
3381                         ] );
3382                 }
3383
3384                 foreach ( $this->mMetatags as $tag ) {
3385                         if ( 0 == strcasecmp( 'http:', substr( $tag[0], 0, 5 ) ) ) {
3386                                 $a = 'http-equiv';
3387                                 $tag[0] = substr( $tag[0], 5 );
3388                         } else {
3389                                 $a = 'name';
3390                         }
3391                         $tagName = "meta-{$tag[0]}";
3392                         if ( isset( $tags[$tagName] ) ) {
3393                                 $tagName .= $tag[1];
3394                         }
3395                         $tags[$tagName] = Html::element( 'meta',
3396                                 [
3397                                         $a => $tag[0],
3398                                         'content' => $tag[1]
3399                                 ]
3400                         );
3401                 }
3402
3403                 foreach ( $this->mLinktags as $tag ) {
3404                         $tags[] = Html::element( 'link', $tag );
3405                 }
3406
3407                 # Universal edit button
3408                 if ( $config->get( 'UniversalEditButton' ) && $this->isArticleRelated() ) {
3409                         $user = $this->getUser();
3410                         if ( $this->getTitle()->quickUserCan( 'edit', $user )
3411                                 && ( $this->getTitle()->exists() ||
3412                                         $this->getTitle()->quickUserCan( 'create', $user ) )
3413                         ) {
3414                                 // Original UniversalEditButton
3415                                 $msg = $this->msg( 'edit' )->text();
3416                                 $tags['universal-edit-button'] = Html::element( 'link', [
3417                                         'rel' => 'alternate',
3418                                         'type' => 'application/x-wiki',
3419                                         'title' => $msg,
3420                                         'href' => $this->getTitle()->getEditURL(),
3421                                 ] );
3422                                 // Alternate edit link
3423                                 $tags['alternative-edit'] = Html::element( 'link', [
3424                                         'rel' => 'edit',
3425                                         'title' => $msg,
3426                                         'href' => $this->getTitle()->getEditURL(),
3427                                 ] );
3428                         }
3429                 }
3430
3431                 # Generally the order of the favicon and apple-touch-icon links
3432                 # should not matter, but Konqueror (3.5.9 at least) incorrectly
3433                 # uses whichever one appears later in the HTML source. Make sure
3434                 # apple-touch-icon is specified first to avoid this.
3435                 if ( $config->get( 'AppleTouchIcon' ) !== false ) {
3436                         $tags['apple-touch-icon'] = Html::element( 'link', [
3437                                 'rel' => 'apple-touch-icon',
3438                                 'href' => $config->get( 'AppleTouchIcon' )
3439                         ] );
3440                 }
3441
3442                 if ( $config->get( 'Favicon' ) !== false ) {
3443                         $tags['favicon'] = Html::element( 'link', [
3444                                 'rel' => 'shortcut icon',
3445                                 'href' => $config->get( 'Favicon' )
3446                         ] );
3447                 }
3448
3449                 # OpenSearch description link
3450                 $tags['opensearch'] = Html::element( 'link', [
3451                         'rel' => 'search',
3452                         'type' => 'application/opensearchdescription+xml',
3453                         'href' => wfScript( 'opensearch_desc' ),
3454                         'title' => $this->msg( 'opensearch-desc' )->inContentLanguage()->text(),
3455                 ] );
3456
3457                 if ( $config->get( 'EnableAPI' ) ) {
3458                         # Real Simple Discovery link, provides auto-discovery information
3459                         # for the MediaWiki API (and potentially additional custom API
3460                         # support such as WordPress or Twitter-compatible APIs for a
3461                         # blogging extension, etc)
3462                         $tags['rsd'] = Html::element( 'link', [
3463                                 'rel' => 'EditURI',
3464                                 'type' => 'application/rsd+xml',
3465                                 // Output a protocol-relative URL here if $wgServer is protocol-relative.
3466                                 // Whether RSD accepts relative or protocol-relative URLs is completely
3467                                 // undocumented, though.
3468                                 'href' => wfExpandUrl( wfAppendQuery(
3469                                         wfScript( 'api' ),
3470                                         [ 'action' => 'rsd' ] ),
3471                                         PROTO_RELATIVE
3472                                 ),
3473                         ] );
3474                 }
3475
3476                 # Language variants
3477                 if ( !$config->get( 'DisableLangConversion' ) ) {
3478                         $lang = $this->getTitle()->getPageLanguage();
3479                         if ( $lang->hasVariants() ) {
3480                                 $variants = $lang->getVariants();
3481                                 foreach ( $variants as $variant ) {
3482                                         $tags["variant-$variant"] = Html::element( 'link', [
3483                                                 'rel' => 'alternate',
3484                                                 'hreflang' => wfBCP47( $variant ),
3485                                                 'href' => $this->getTitle()->getLocalURL(
3486                                                         [ 'variant' => $variant ] )
3487                                                 ]
3488                                         );
3489                                 }
3490                                 # x-default link per https://support.google.com/webmasters/answer/189077?hl=en
3491                                 $tags["variant-x-default"] = Html::element( 'link', [
3492                                         'rel' => 'alternate',
3493                                         'hreflang' => 'x-default',
3494                                         'href' => $this->getTitle()->getLocalURL() ] );
3495                         }
3496                 }
3497
3498                 # Copyright
3499                 if ( $this->copyrightUrl !== null ) {
3500                         $copyright = $this->copyrightUrl;
3501                 } else {
3502                         $copyright = '';
3503                         if ( $config->get( 'RightsPage' ) ) {
3504                                 $copy = Title::newFromText( $config->get( 'RightsPage' ) );
3505
3506                                 if ( $copy ) {
3507                                         $copyright = $copy->getLocalURL();
3508                                 }
3509                         }
3510
3511                         if ( !$copyright && $config->get( 'RightsUrl' ) ) {
3512                                 $copyright = $config->get( 'RightsUrl' );
3513                         }
3514                 }
3515
3516                 if ( $copyright ) {
3517                         $tags['copyright'] = Html::element( 'link', [
3518                                 'rel' => 'copyright',
3519                                 'href' => $copyright ]
3520                         );
3521                 }
3522
3523                 # Feeds
3524                 if ( $config->get( 'Feed' ) ) {
3525                         $feedLinks = [];
3526
3527                         foreach ( $this->getSyndicationLinks() as $format => $link ) {
3528                                 # Use the page name for the title.  In principle, this could
3529                                 # lead to issues with having the same name for different feeds
3530                                 # corresponding to the same page, but we can't avoid that at
3531                                 # this low a level.
3532
3533                                 $feedLinks[] = $this->feedLink(
3534                                         $format,
3535                                         $link,
3536                                         # Used messages: 'page-rss-feed' and 'page-atom-feed' (for an easier grep)
3537                                         $this->msg(
3538                                                 "page-{$format}-feed", $this->getTitle()->getPrefixedText()
3539                                         )->text()
3540                                 );
3541                         }
3542
3543                         # Recent changes feed should appear on every page (except recentchanges,
3544                         # that would be redundant). Put it after the per-page feed to avoid
3545                         # changing existing behavior. It's still available, probably via a
3546                         # menu in your browser. Some sites might have a different feed they'd
3547                         # like to promote instead of the RC feed (maybe like a "Recent New Articles"
3548                         # or "Breaking news" one). For this, we see if $wgOverrideSiteFeed is defined.
3549                         # If so, use it instead.
3550                         $sitename = $config->get( 'Sitename' );
3551                         if ( $config->get( 'OverrideSiteFeed' ) ) {
3552                                 foreach ( $config->get( 'OverrideSiteFeed' ) as $type => $feedUrl ) {
3553                                         // Note, this->feedLink escapes the url.
3554                                         $feedLinks[] = $this->feedLink(
3555                                                 $type,
3556                                                 $feedUrl,
3557                                                 $this->msg( "site-{$type}-feed", $sitename )->text()
3558                                         );
3559                                 }
3560                         } elseif ( !$this->getTitle()->isSpecial( 'Recentchanges' ) ) {
3561                                 $rctitle = SpecialPage::getTitleFor( 'Recentchanges' );
3562                                 foreach ( $config->get( 'AdvertisedFeedTypes' ) as $format ) {
3563                                         $feedLinks[] = $this->feedLink(
3564                                                 $format,
3565                                                 $rctitle->getLocalURL( [ 'feed' => $format ] ),
3566                                                 # For grep: 'site-rss-feed', 'site-atom-feed'
3567                                                 $this->msg( "site-{$format}-feed", $sitename )->text()
3568                                         );
3569                                 }
3570                         }
3571
3572                         # Allow extensions to change the list pf feeds. This hook is primarily for changing,
3573                         # manipulating or removing existing feed tags. If you want to add new feeds, you should
3574                         # use OutputPage::addFeedLink() instead.
3575                         Hooks::run( 'AfterBuildFeedLinks', [ &$feedLinks ] );
3576
3577                         $tags += $feedLinks;
3578                 }
3579
3580                 # Canonical URL
3581                 if ( $config->get( 'EnableCanonicalServerLink' ) ) {
3582                         if ( $canonicalUrl !== false ) {
3583                                 $canonicalUrl = wfExpandUrl( $canonicalUrl, PROTO_CANONICAL );
3584                         } else {
3585                                 if ( $this->isArticleRelated() ) {
3586                                         // This affects all requests where "setArticleRelated" is true. This is
3587                                         // typically all requests that show content (query title, curid, oldid, diff),
3588                                         // and all wikipage actions (edit, delete, purge, info, history etc.).
3589                                         // It does not apply to File pages and Special pages.
3590                                         // 'history' and 'info' actions address page metadata rather than the page
3591                                         // content itself, so they may not be canonicalized to the view page url.
3592                                         // TODO: this ought to be better encapsulated in the Action class.
3593                                         $action = Action::getActionName( $this->getContext() );
3594                                         if ( in_array( $action, [ 'history', 'info' ] ) ) {
3595                                                 $query = "action={$action}";
3596                                         } else {
3597                                                 $query = '';
3598                                         }
3599                                         $canonicalUrl = $this->getTitle()->getCanonicalURL( $query );
3600                                 } else {
3601                                         $reqUrl = $this->getRequest()->getRequestURL();
3602                                         $canonicalUrl = wfExpandUrl( $reqUrl, PROTO_CANONICAL );
3603                                 }
3604                         }
3605                 }
3606                 if ( $canonicalUrl !== false ) {
3607                         $tags[] = Html::element( 'link', [
3608                                 'rel' => 'canonical',
3609                                 'href' => $canonicalUrl
3610                         ] );
3611                 }
3612
3613                 return $tags;
3614         }
3615
3616         /**
3617          * @return string HTML tag links to be put in the header.
3618          * @deprecated since 1.24 Use OutputPage::headElement or if you have to,
3619          *   OutputPage::getHeadLinksArray directly.
3620          */
3621         public function getHeadLinks() {
3622                 wfDeprecated( __METHOD__, '1.24' );
3623                 return implode( "\n", $this->getHeadLinksArray() );
3624         }
3625
3626         /**
3627          * Generate a "<link rel/>" for a feed.
3628          *
3629          * @param string $type Feed type
3630          * @param string $url URL to the feed
3631          * @param string $text Value of the "title" attribute
3632          * @return string HTML fragment
3633          */
3634         private function feedLink( $type, $url, $text ) {
3635                 return Html::element( 'link', [
3636                         'rel' => 'alternate',
3637                         'type' => "application/$type+xml",
3638                         'title' => $text,
3639                         'href' => $url ]
3640                 );
3641         }
3642
3643         /**
3644          * Add a local or specified stylesheet, with the given media options.
3645          * Internal use only. Use OutputPage::addModuleStyles() if possible.
3646          *
3647          * @param string $style URL to the file
3648          * @param string $media To specify a media type, 'screen', 'printable', 'handheld' or any.
3649          * @param string $condition For IE conditional comments, specifying an IE version
3650          * @param string $dir Set to 'rtl' or 'ltr' for direction-specific sheets
3651          */
3652         public function addStyle( $style, $media = '', $condition = '', $dir = '' ) {
3653                 $options = [];
3654                 if ( $media ) {
3655                         $options['media'] = $media;
3656                 }
3657                 if ( $condition ) {
3658                         $options['condition'] = $condition;
3659                 }
3660                 if ( $dir ) {
3661                         $options['dir'] = $dir;
3662                 }
3663                 $this->styles[$style] = $options;
3664         }
3665
3666         /**
3667          * Adds inline CSS styles
3668          * Internal use only. Use OutputPage::addModuleStyles() if possible.
3669          *
3670          * @param mixed $style_css Inline CSS
3671          * @param string $flip Set to 'flip' to flip the CSS if needed
3672          */
3673         public function addInlineStyle( $style_css, $flip = 'noflip' ) {
3674                 if ( $flip === 'flip' && $this->getLanguage()->isRTL() ) {
3675                         # If wanted, and the interface is right-to-left, flip the CSS
3676                         $style_css = CSSJanus::transform( $style_css, true, false );
3677                 }
3678                 $this->mInlineStyles .= Html::inlineStyle( $style_css ) . "\n";
3679         }
3680
3681         /**
3682          * Build a set of "<link>" elements for the stylesheets specified in the $this->styles array.
3683          * These will be applied to various media & IE conditionals.
3684          *
3685          * @return string
3686          */
3687         public function buildCssLinks() {
3688                 global $wgContLang;
3689
3690                 $this->getSkin()->setupSkinUserCss( $this );
3691
3692                 // Add ResourceLoader styles
3693                 // Split the styles into these groups
3694                 $styles = [
3695                         'other' => [],
3696                         'user' => [],
3697                         'site' => [],
3698                         'private' => [],
3699                         'noscript' => []
3700                 ];
3701                 $links = [];
3702                 $otherTags = []; // Tags to append after the normal <link> tags
3703                 $resourceLoader = $this->getResourceLoader();
3704
3705                 $moduleStyles = $this->getModuleStyles();
3706
3707                 // Per-site custom styles
3708                 $moduleStyles[] = 'site';
3709                 $moduleStyles[] = 'noscript';
3710                 $moduleStyles[] = 'user.groups';
3711
3712                 // Per-user custom styles
3713                 if ( $this->getConfig()->get( 'AllowUserCss' ) && $this->getTitle()->isCssSubpage()
3714                         && $this->userCanPreview()
3715                 ) {
3716                         // We're on a preview of a CSS subpage
3717                         // Exclude this page from the user module in case it's in there (bug 26283)
3718                         $link = $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_STYLES,
3719                                 [ 'excludepage' => $this->getTitle()->getPrefixedDBkey() ]
3720                         );
3721                         $otherTags = array_merge( $otherTags, $link['html'] );
3722
3723                         // Load the previewed CSS
3724                         // If needed, Janus it first. This is user-supplied CSS, so it's
3725                         // assumed to be right for the content language directionality.
3726                         $previewedCSS = $this->getRequest()->getText( 'wpTextbox1' );
3727                         if ( $this->getLanguage()->getDir() !== $wgContLang->getDir() ) {
3728                                 $previewedCSS = CSSJanus::transform( $previewedCSS, true, false );
3729                         }
3730                         $otherTags[] = Html::inlineStyle( $previewedCSS ) . "\n";
3731                 } else {
3732                         // Load the user styles normally
3733                         $moduleStyles[] = 'user';
3734                 }
3735
3736                 // Per-user preference styles
3737                 $moduleStyles[] = 'user.cssprefs';
3738
3739                 foreach ( $moduleStyles as $name ) {
3740                         $module = $resourceLoader->getModule( $name );
3741                         if ( !$module ) {
3742                                 continue;
3743                         }
3744                         if ( $name === 'site' ) {
3745                                 // HACK: The site module shouldn't be fragmented with a cache group and
3746                                 // http request. But in order to ensure its styles are separated and after the
3747                                 // ResourceLoaderDynamicStyles marker, pretend it is in a group called 'site'.
3748                                 // The scripts remain ungrouped and rides the bottom queue.
3749                                 $styles['site'][] = $name;
3750                                 continue;
3751                         }
3752                         $group = $module->getGroup();
3753                         // Modules in groups other than the ones needing special treatment
3754                         // (see $styles assignment)
3755                         // will be placed in the "other" style category.
3756                         $styles[isset( $styles[$group] ) ? $group : 'other'][] = $name;
3757                 }
3758
3759                 // We want site, private and user styles to override dynamically added
3760                 // styles from modules, but we want dynamically added styles to override
3761                 // statically added styles from other modules. So the order has to be
3762                 // other, dynamic, site, private, user. Add statically added styles for
3763                 // other modules
3764                 $links[] = $this->makeResourceLoaderLink(
3765                         $styles['other'],
3766                         ResourceLoaderModule::TYPE_STYLES
3767                 );
3768                 // Add normal styles added through addStyle()/addInlineStyle() here
3769                 $links[] = implode( "\n", $this->buildCssLinksArray() ) . $this->mInlineStyles;
3770                 // Add marker tag to mark the place where the client-side
3771                 // loader should inject dynamic styles
3772                 // We use a <meta> tag with a made-up name for this because that's valid HTML
3773                 $links[] = Html::element(
3774                         'meta',
3775                         [ 'name' => 'ResourceLoaderDynamicStyles', 'content' => '' ]
3776                 );
3777
3778                 // Add site-specific and user-specific styles
3779                 // 'private' at present only contains user.options, so put that before 'user'
3780                 // Any future private modules will likely have a similar user-specific character
3781                 foreach ( [ 'site', 'noscript', 'private', 'user' ] as $group ) {
3782                         $links[] = $this->makeResourceLoaderLink( $styles[$group],
3783                                 ResourceLoaderModule::TYPE_STYLES
3784                         );
3785                 }
3786
3787                 // Add stuff in $otherTags (previewed user CSS if applicable)
3788                 return self::getHtmlFromLoaderLinks( $links ) . implode( '', $otherTags );
3789         }
3790
3791         /**
3792          * @return array
3793          */
3794         public function buildCssLinksArray() {
3795                 $links = [];
3796
3797                 // Add any extension CSS
3798                 foreach ( $this->mExtStyles as $url ) {
3799                         $this->addStyle( $url );
3800                 }
3801                 $this->mExtStyles = [];
3802
3803                 foreach ( $this->styles as $file => $options ) {
3804                         $link = $this->styleLink( $file, $options );
3805                         if ( $link ) {
3806                                 $links[$file] = $link;
3807                         }
3808                 }
3809                 return $links;
3810         }
3811
3812         /**
3813          * Generate \<link\> tags for stylesheets
3814          *
3815          * @param string $style URL to the file
3816          * @param array $options Option, can contain 'condition', 'dir', 'media' keys
3817          * @return string HTML fragment
3818          */
3819         protected function styleLink( $style, array $options ) {
3820                 if ( isset( $options['dir'] ) ) {
3821                         if ( $this->getLanguage()->getDir() != $options['dir'] ) {
3822                                 return '';
3823                         }
3824                 }
3825
3826                 if ( isset( $options['media'] ) ) {
3827                         $media = self::transformCssMedia( $options['media'] );
3828                         if ( is_null( $media ) ) {
3829                                 return '';
3830                         }
3831                 } else {
3832                         $media = 'all';
3833                 }
3834
3835                 if ( substr( $style, 0, 1 ) == '/' ||
3836                         substr( $style, 0, 5 ) == 'http:' ||
3837                         substr( $style, 0, 6 ) == 'https:' ) {
3838                         $url = $style;
3839                 } else {
3840                         $config = $this->getConfig();
3841                         $url = $config->get( 'StylePath' ) . '/' . $style . '?' .
3842                                 $config->get( 'StyleVersion' );
3843                 }
3844
3845                 $link = Html::linkedStyle( $url, $media );
3846
3847                 if ( isset( $options['condition'] ) ) {
3848                         $condition = htmlspecialchars( $options['condition'] );
3849                         $link = "<!--[if $condition]>$link<![endif]-->";
3850                 }
3851                 return $link;
3852         }
3853
3854         /**
3855          * Transform path to web-accessible static resource.
3856          *
3857          * This is used to add a validation hash as query string.
3858          * This aids various behaviors:
3859          *
3860          * - Put long Cache-Control max-age headers on responses for improved
3861          *   cache performance.
3862          * - Get the correct version of a file as expected by the current page.
3863          * - Instantly get the updated version of a file after deployment.
3864          *
3865          * Avoid using this for urls included in HTML as otherwise clients may get different
3866          * versions of a resource when navigating the site depending on when the page was cached.
3867          * If changes to the url propagate, this is not a problem (e.g. if the url is in
3868          * an external stylesheet).
3869          *
3870          * @since 1.27
3871          * @param Config $config
3872          * @param string $path Path-absolute URL to file (from document root, must start with "/")
3873          * @return string URL
3874          */
3875         public static function transformResourcePath( Config $config, $path ) {
3876                 global $IP;
3877                 $remotePathPrefix = $config->get( 'ResourceBasePath' );
3878                 if ( $remotePathPrefix === '' ) {
3879                         // The configured base path is required to be empty string for
3880                         // wikis in the domain root
3881                         $remotePath = '/';
3882                 } else {
3883                         $remotePath = $remotePathPrefix;
3884                 }
3885                 if ( strpos( $path, $remotePath ) !== 0 ) {
3886                         // Path is outside wgResourceBasePath, ignore.
3887                         return $path;
3888                 }
3889                 $path = RelPath\getRelativePath( $path, $remotePath );
3890                 return self::transformFilePath( $remotePathPrefix, $IP, $path );
3891         }
3892
3893         /**
3894          * Utility method for transformResourceFilePath().
3895          *
3896          * Caller is responsible for ensuring the file exists. Emits a PHP warning otherwise.
3897          *
3898          * @since 1.27
3899          * @param string $remotePath URL path prefix that points to $localPath
3900          * @param string $localPath File directory exposed at $remotePath
3901          * @param string $file Path to target file relative to $localPath
3902          * @return string URL
3903          */
3904         public static function transformFilePath( $remotePathPrefix, $localPath, $file ) {
3905                 $hash = md5_file( "$localPath/$file" );
3906                 if ( $hash === false ) {
3907                         wfLogWarning( __METHOD__ . ": Failed to hash $localPath/$file" );
3908                         $hash = '';
3909                 }
3910                 return "$remotePathPrefix/$file?" . substr( $hash, 0, 5 );
3911         }
3912
3913         /**
3914          * Transform "media" attribute based on request parameters
3915          *
3916          * @param string $media Current value of the "media" attribute
3917          * @return string Modified value of the "media" attribute, or null to skip
3918          * this stylesheet
3919          */
3920         public static function transformCssMedia( $media ) {
3921                 global $wgRequest;
3922
3923                 // http://www.w3.org/TR/css3-mediaqueries/#syntax
3924                 $screenMediaQueryRegex = '/^(?:only\s+)?screen\b/i';
3925
3926                 // Switch in on-screen display for media testing
3927                 $switches = [
3928                         'printable' => 'print',
3929                         'handheld' => 'handheld',
3930                 ];
3931                 foreach ( $switches as $switch => $targetMedia ) {
3932                         if ( $wgRequest->getBool( $switch ) ) {
3933                                 if ( $media == $targetMedia ) {
3934                                         $media = '';
3935                                 } elseif ( preg_match( $screenMediaQueryRegex, $media ) === 1 ) {
3936                                         /* This regex will not attempt to understand a comma-separated media_query_list
3937                                          *
3938                                          * Example supported values for $media:
3939                                          * 'screen', 'only screen', 'screen and (min-width: 982px)' ),
3940                                          * Example NOT supported value for $media:
3941                                          * '3d-glasses, screen, print and resolution > 90dpi'
3942                                          *
3943                                          * If it's a print request, we never want any kind of screen stylesheets
3944                                          * If it's a handheld request (currently the only other choice with a switch),
3945                                          * we don't want simple 'screen' but we might want screen queries that
3946                                          * have a max-width or something, so we'll pass all others on and let the
3947                                          * client do the query.
3948                                          */
3949                                         if ( $targetMedia == 'print' || $media == 'screen' ) {
3950                                                 return null;
3951                                         }
3952                                 }
3953                         }
3954                 }
3955
3956                 return $media;
3957         }
3958
3959         /**
3960          * Add a wikitext-formatted message to the output.
3961          * This is equivalent to:
3962          *
3963          *    $wgOut->addWikiText( wfMessage( ... )->plain() )
3964          */
3965         public function addWikiMsg( /*...*/ ) {
3966                 $args = func_get_args();
3967                 $name = array_shift( $args );
3968                 $this->addWikiMsgArray( $name, $args );
3969         }
3970
3971         /**
3972          * Add a wikitext-formatted message to the output.
3973          * Like addWikiMsg() except the parameters are taken as an array
3974          * instead of a variable argument list.
3975          *
3976          * @param string $name
3977          * @param array $args
3978          */
3979         public function addWikiMsgArray( $name, $args ) {
3980                 $this->addHTML( $this->msg( $name, $args )->parseAsBlock() );
3981         }
3982
3983         /**
3984          * This function takes a number of message/argument specifications, wraps them in
3985          * some overall structure, and then parses the result and adds it to the output.
3986          *
3987          * In the $wrap, $1 is replaced with the first message, $2 with the second,
3988          * and so on. The subsequent arguments may be either
3989          * 1) strings, in which case they are message names, or
3990          * 2) arrays, in which case, within each array, the first element is the message
3991          *    name, and subsequent elements are the parameters to that message.
3992          *
3993          * Don't use this for messages that are not in the user's interface language.
3994          *
3995          * For example:
3996          *
3997          *    $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>", 'some-error' );
3998          *
3999          * Is equivalent to:
4000          *
4001          *    $wgOut->addWikiText( "<div class='error'>\n"
4002          *        . wfMessage( 'some-error' )->plain() . "\n</div>" );
4003          *
4004          * The newline after the opening div is needed in some wikitext. See bug 19226.
4005          *
4006          * @param string $wrap
4007          */
4008         public function wrapWikiMsg( $wrap /*, ...*/ ) {
4009                 $msgSpecs = func_get_args();
4010                 array_shift( $msgSpecs );
4011                 $msgSpecs = array_values( $msgSpecs );
4012                 $s = $wrap;
4013                 foreach ( $msgSpecs as $n => $spec ) {
4014                         if ( is_array( $spec ) ) {
4015                                 $args = $spec;
4016                                 $name = array_shift( $args );
4017                                 if ( isset( $args['options'] ) ) {
4018                                         unset( $args['options'] );
4019                                         wfDeprecated(
4020                                                 'Adding "options" to ' . __METHOD__ . ' is no longer supported',
4021                                                 '1.20'
4022                                         );
4023                                 }
4024                         } else {
4025                                 $args = [];
4026                                 $name = $spec;
4027                         }
4028                         $s = str_replace( '$' . ( $n + 1 ), $this->msg( $name, $args )->plain(), $s );
4029                 }
4030                 $this->addWikiText( $s );
4031         }
4032
4033         /**
4034          * Enables/disables TOC, doesn't override __NOTOC__
4035          * @param bool $flag
4036          * @since 1.22
4037          */
4038         public function enableTOC( $flag = true ) {
4039                 $this->mEnableTOC = $flag;
4040         }
4041
4042         /**
4043          * @return bool
4044          * @since 1.22
4045          */
4046         public function isTOCEnabled() {
4047                 return $this->mEnableTOC;
4048         }
4049
4050         /**
4051          * Enables/disables section edit links, doesn't override __NOEDITSECTION__
4052          * @param bool $flag
4053          * @since 1.23
4054          */
4055         public function enableSectionEditLinks( $flag = true ) {
4056                 $this->mEnableSectionEditLinks = $flag;
4057         }
4058
4059         /**
4060          * @return bool
4061          * @since 1.23
4062          */
4063         public function sectionEditLinksEnabled() {
4064                 return $this->mEnableSectionEditLinks;
4065         }
4066
4067         /**
4068          * Helper function to setup the PHP implementation of OOUI to use in this request.
4069          *
4070          * @since 1.26
4071          * @param String $skinName The Skin name to determine the correct OOUI theme
4072          * @param String $dir Language direction
4073          */
4074         public static function setupOOUI( $skinName = '', $dir = 'ltr' ) {
4075                 $themes = ExtensionRegistry::getInstance()->getAttribute( 'SkinOOUIThemes' );
4076                 // Make keys (skin names) lowercase for case-insensitive matching.
4077                 $themes = array_change_key_case( $themes, CASE_LOWER );
4078                 $theme = isset( $themes[$skinName] ) ? $themes[$skinName] : 'MediaWiki';
4079                 // For example, 'OOUI\MediaWikiTheme'.
4080                 $themeClass = "OOUI\\{$theme}Theme";
4081                 OOUI\Theme::setSingleton( new $themeClass() );
4082                 OOUI\Element::setDefaultDir( $dir );
4083         }
4084
4085         /**
4086          * Add ResourceLoader module styles for OOUI and set up the PHP implementation of it for use with
4087          * MediaWiki and this OutputPage instance.
4088          *
4089          * @since 1.25
4090          */
4091         public function enableOOUI() {
4092                 self::setupOOUI(
4093                         strtolower( $this->getSkin()->getSkinName() ),
4094                         $this->getLanguage()->getDir()
4095                 );
4096                 $this->addModuleStyles( [
4097                         'oojs-ui-core.styles',
4098                         'oojs-ui.styles.icons',
4099                         'oojs-ui.styles.indicators',
4100                         'oojs-ui.styles.textures',
4101                         'mediawiki.widgets.styles',
4102                 ] );
4103                 // Used by 'skipFunction' of the four 'oojs-ui.styles.*' modules. Please don't treat this as a
4104                 // public API or you'll be severely disappointed when T87871 is fixed and it disappears.
4105                 $this->addMeta( 'X-OOUI-PHP', '1' );
4106         }
4107 }