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 use WrappedString\WrappedStringList;
  27
  28 /**
  29  * This class should be covered by a general architecture document which does
  30  * not exist as of January 2011.  This is one of the Core classes and should
  31  * be read at least once by any new developers.
  32  *
  33  * This class is used to prepare the final rendering. A skin is then
  34  * applied to the output parameters (links, javascript, html, categories ...).
  35  *
  36  * @todo FIXME: Another class handles sending the whole page to the client.
  37  *
  38  * Some comments comes from a pairing session between Zak Greant and Antoine Musso
  39  * in November 2010.
  40  *
  41  * @todo document
  42  */
  43 class OutputPage extends ContextSource {
  44         /** @var array Should be private. Used with addMeta() which adds "<meta>" */
  45         protected $mMetatags = [];
  46
  47         /** @var array */
  48         protected $mLinktags = [];
  49
  50         /** @var bool */
  51         protected $mCanonicalUrl = false;
  52
  53         /**
  54          * @var array Additional stylesheets. Looks like this is for extensions.
  55          *   Might be replaced by ResourceLoader.
  56          */
  57         protected $mExtStyles = [];
  58
  59         /**
  60          * @var string Should be private - has getter and setter. Contains
  61          *   the HTML title */
  62         public $mPagetitle = '';
  63
  64         /**
  65          * @var string Contains all of the "<body>" content. Should be private we
  66          *   got set/get accessors and the append() method.
  67          */
  68         public $mBodytext = '';
  69
  70         /**
  71          * Holds the debug lines that will be output as comments in page source if
  72          * $wgDebugComments is enabled. See also $wgShowDebug.
  73          * @deprecated since 1.20; use MWDebug class instead.
  74          */
  75         public $mDebugtext = '';
  76
  77         /** @var string Stores contents of "<title>" tag */
  78         private $mHTMLtitle = '';
  79
  80         /**
  81          * @var bool Is the displayed content related to the source of the
  82          *   corresponding wiki article.
  83          */
  84         private $mIsarticle = false;
  85
  86         /** @var bool Stores "article flag" toggle. */
  87         private $mIsArticleRelated = true;
  88
  89         /**
  90          * @var bool We have to set isPrintable(). Some pages should
  91          * never be printed (ex: redirections).
  92          */
  93         private $mPrintable = false;
  94
  95         /**
  96          * @var array Contains the page subtitle. Special pages usually have some
  97          *   links here. Don't confuse with site subtitle added by skins.
  98          */
  99         private $mSubtitle = [];
 100
 101         /** @var string */
 102         public $mRedirect = '';
 103
 104         /** @var int */
 105         protected $mStatusCode;
 106
 107         /**
 108          * @var string Used for sending cache control.
 109          *   The whole caching system should probably be moved into its own class.
 110          */
 111         protected $mLastModified = '';
 112
 113         /** @var array */
 114         protected $mCategoryLinks = [];
 115
 116         /** @var array */
 117         protected $mCategories = [];
 118
 119         /** @var array */
 120         protected $mIndicators = [];
 121
 122         /** @var array Array of Interwiki Prefixed (non DB key) Titles (e.g. 'fr:Test page') */
 123         private $mLanguageLinks = [];
 124
 125         /**
 126          * Used for JavaScript (predates ResourceLoader)
 127          * @todo We should split JS / CSS.
 128          * mScripts content is inserted as is in "<head>" by Skin. This might
 129          * contain either a link to a stylesheet or inline CSS.
 130          */
 131         private $mScripts = '';
 132
 133         /** @var string Inline CSS styles. Use addInlineStyle() sparingly */
 134         protected $mInlineStyles = '';
 135
 136         /**
 137          * @var string Used by skin template.
 138          * Example: $tpl->set( 'displaytitle', $out->mPageLinkTitle );
 139          */
 140         public $mPageLinkTitle = '';
 141
 142         /** @var array Array of elements in "<head>". Parser might add its own headers! */
 143         protected $mHeadItems = [];
 144
 145         /** @var array */
 146         protected $mModules = [];
 147
 148         /** @var array */
 149         protected $mModuleScripts = [];
 150
 151         /** @var array */
 152         protected $mModuleStyles = [];
 153
 154         /** @var ResourceLoader */
 155         protected $mResourceLoader;
 156
 157         /** @var ResourceLoaderClientHtml */
 158         private $rlClient;
 159
 160         /** @var ResourceLoaderContext */
 161         private $rlClientContext;
 162
 163         /** @var string */
 164         private $rlUserModuleState;
 165
 166         /** @var array */
 167         private $rlExemptStyleModules;
 168
 169         /** @var array */
 170         protected $mJsConfigVars = [];
 171
 172         /** @var array */
 173         protected $mTemplateIds = [];
 174
 175         /** @var array */
 176         protected $mImageTimeKeys = [];
 177
 178         /** @var string */
 179         public $mRedirectCode = '';
 180
 181         protected $mFeedLinksAppendQuery = null;
 182
 183         /** @var array
 184          * What level of 'untrustworthiness' is allowed in CSS/JS modules loaded on this page?
 185          * @see ResourceLoaderModule::$origin
 186          * ResourceLoaderModule::ORIGIN_ALL is assumed unless overridden;
 187          */
 188         protected $mAllowedModules = [
 189                 ResourceLoaderModule::TYPE_COMBINED => ResourceLoaderModule::ORIGIN_ALL,
 190         ];
 191
 192         /** @var bool Whether output is disabled.  If this is true, the 'output' method will do nothing. */
 193         protected $mDoNothing = false;
 194
 195         // Parser related.
 196
 197         /** @var int */
 198         protected $mContainsNewMagic = 0;
 199
 200         /**
 201          * lazy initialised, use parserOptions()
 202          * @var ParserOptions
 203          */
 204         protected $mParserOptions = null;
 205
 206         /**
 207          * Handles the Atom / RSS links.
 208          * We probably only support Atom in 2011.
 209          * @see $wgAdvertisedFeedTypes
 210          */
 211         private $mFeedLinks = [];
 212
 213         // Gwicke work on squid caching? Roughly from 2003.
 214         protected $mEnableClientCache = true;
 215
 216         /** @var bool Flag if output should only contain the body of the article. */
 217         private $mArticleBodyOnly = false;
 218
 219         /** @var bool */
 220         protected $mNewSectionLink = false;
 221
 222         /** @var bool */
 223         protected $mHideNewSectionLink = false;
 224
 225         /**
 226          * @var bool Comes from the parser. This was probably made to load CSS/JS
 227          * only if we had "<gallery>". Used directly in CategoryPage.php.
 228          * Looks like ResourceLoader can replace this.
 229          */
 230         public $mNoGallery = false;
 231
 232         /** @var string */
 233         private $mPageTitleActionText = '';
 234
 235         /** @var int Cache stuff. Looks like mEnableClientCache */
 236         protected $mCdnMaxage = 0;
 237         /** @var int Upper limit on mCdnMaxage */
 238         protected $mCdnMaxageLimit = INF;
 239
 240         /**
 241          * @var bool Controls if anti-clickjacking / frame-breaking headers will
 242          * be sent. This should be done for pages where edit actions are possible.
 243          * Setters: $this->preventClickjacking() and $this->allowClickjacking().
 244          */
 245         protected $mPreventClickjacking = true;
 246
 247         /** @var int To include the variable {{REVISIONID}} */
 248         private $mRevisionId = null;
 249
 250         /** @var string */
 251         private $mRevisionTimestamp = null;
 252
 253         /** @var array */
 254         protected $mFileVersion = null;
 255
 256         /**
 257          * @var array An array of stylesheet filenames (relative from skins path),
 258          * with options for CSS media, IE conditions, and RTL/LTR direction.
 259          * For internal use; add settings in the skin via $this->addStyle()
 260          *
 261          * Style again! This seems like a code duplication since we already have
 262          * mStyles. This is what makes Open Source amazing.
 263          */
 264         protected $styles = [];
 265
 266         private $mIndexPolicy = 'index';
 267         private $mFollowPolicy = 'follow';
 268         private $mVaryHeader = [
 269                 'Accept-Encoding' => [ 'match=gzip' ],
 270         ];
 271
 272         /**
 273          * If the current page was reached through a redirect, $mRedirectedFrom contains the Title
 274          * of the redirect.
 275          *
 276          * @var Title
 277          */
 278         private $mRedirectedFrom = null;
 279
 280         /**
 281          * Additional key => value data
 282          */
 283         private $mProperties = [];
 284
 285         /**
 286          * @var string|null ResourceLoader target for load.php links. If null, will be omitted
 287          */
 288         private $mTarget = null;
 289
 290         /**
 291          * @var bool Whether parser output should contain table of contents
 292          */
 293         private $mEnableTOC = true;
 294
 295         /**
 296          * @var bool Whether parser output should contain section edit links
 297          */
 298         private $mEnableSectionEditLinks = true;
 299
 300         /**
 301          * @var string|null The URL to send in a <link> element with rel=copyright
 302          */
 303         private $copyrightUrl;
 304
 305         /** @var array Profiling data */
 306         private $limitReportData = [];
 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;
 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( $script );
 520         }
 521
 522         /**
 523          * Filter an array of modules to remove insufficiently trustworthy members, and modules
 524          * which are no longer registered (eg a page is cached before an extension is disabled)
 525          * @param array $modules
 526          * @param string|null $position If not null, only return modules with this position
 527          * @param string $type
 528          * @return array
 529          */
 530         protected function filterModules( array $modules, $position = null,
 531                 $type = ResourceLoaderModule::TYPE_COMBINED
 532         ) {
 533                 $resourceLoader = $this->getResourceLoader();
 534                 $filteredModules = [];
 535                 foreach ( $modules as $val ) {
 536                         $module = $resourceLoader->getModule( $val );
 537                         if ( $module instanceof ResourceLoaderModule
 538                                 && $module->getOrigin() <= $this->getAllowedModules( $type )
 539                                 && ( is_null( $position ) || $module->getPosition() == $position )
 540                                 && ( !$this->mTarget || in_array( $this->mTarget, $module->getTargets() ) )
 541                         ) {
 542                                 $filteredModules[] = $val;
 543                         }
 544                 }
 545                 return $filteredModules;
 546         }
 547
 548         /**
 549          * Get the list of modules to include on this page
 550          *
 551          * @param bool $filter Whether to filter out insufficiently trustworthy modules
 552          * @param string|null $position If not null, only return modules with this position
 553          * @param string $param
 554          * @return array Array of module names
 555          */
 556         public function getModules( $filter = false, $position = null, $param = 'mModules',
 557                 $type = ResourceLoaderModule::TYPE_COMBINED
 558         ) {
 559                 $modules = array_values( array_unique( $this->$param ) );
 560                 return $filter
 561                         ? $this->filterModules( $modules, $position, $type )
 562                         : $modules;
 563         }
 564
 565         /**
 566          * Add one or more modules recognized by ResourceLoader. Modules added
 567          * through this function will be loaded by ResourceLoader when the
 568          * page loads.
 569          *
 570          * @param string|array $modules Module name (string) or array of module names
 571          */
 572         public function addModules( $modules ) {
 573                 $this->mModules = array_merge( $this->mModules, (array)$modules );
 574         }
 575
 576         /**
 577          * Get the list of module JS to include on this page
 578          *
 579          * @param bool $filter
 580          * @param string|null $position
 581          * @return array Array of module names
 582          */
 583         public function getModuleScripts( $filter = false, $position = null ) {
 584                 return $this->getModules( $filter, $position, 'mModuleScripts',
 585                         ResourceLoaderModule::TYPE_SCRIPTS
 586                 );
 587         }
 588
 589         /**
 590          * Add only JS of one or more modules recognized by ResourceLoader. Module
 591          * scripts added through this function will be loaded by ResourceLoader when
 592          * the page loads.
 593          *
 594          * @param string|array $modules Module name (string) or array of module names
 595          */
 596         public function addModuleScripts( $modules ) {
 597                 $this->mModuleScripts = array_merge( $this->mModuleScripts, (array)$modules );
 598         }
 599
 600         /**
 601          * Get the list of module CSS to include on this page
 602          *
 603          * @param bool $filter
 604          * @param string|null $position
 605          * @return array Array of module names
 606          */
 607         public function getModuleStyles( $filter = false, $position = null ) {
 608                 return $this->getModules( $filter, $position, 'mModuleStyles',
 609                         ResourceLoaderModule::TYPE_STYLES
 610                 );
 611         }
 612
 613         /**
 614          * Add only CSS of one or more modules recognized by ResourceLoader.
 615          *
 616          * Module styles added through this function will be added using standard link CSS
 617          * tags, rather than as a combined Javascript and CSS package. Thus, they will
 618          * load when JavaScript is disabled (unless CSS also happens to be disabled).
 619          *
 620          * @param string|array $modules Module name (string) or array of module names
 621          */
 622         public function addModuleStyles( $modules ) {
 623                 $this->mModuleStyles = array_merge( $this->mModuleStyles, (array)$modules );
 624         }
 625
 626         /**
 627          * @return null|string ResourceLoader target
 628          */
 629         public function getTarget() {
 630                 return $this->mTarget;
 631         }
 632
 633         /**
 634          * Sets ResourceLoader target for load.php links. If null, will be omitted
 635          *
 636          * @param string|null $target
 637          */
 638         public function setTarget( $target ) {
 639                 $this->mTarget = $target;
 640         }
 641
 642         /**
 643          * Get an array of head items
 644          *
 645          * @return array
 646          */
 647         function getHeadItemsArray() {
 648                 return $this->mHeadItems;
 649         }
 650
 651         /**
 652          * Add or replace a head item to the output
 653          *
 654          * Whenever possible, use more specific options like ResourceLoader modules,
 655          * OutputPage::addLink(), OutputPage::addMetaLink() and OutputPage::addFeedLink()
 656          * Fallback options for those are: OutputPage::addStyle, OutputPage::addScript(),
 657          * OutputPage::addInlineScript() and OutputPage::addInlineStyle()
 658          * This would be your very LAST fallback.
 659          *
 660          * @param string $name Item name
 661          * @param string $value Raw HTML
 662          */
 663         public function addHeadItem( $name, $value ) {
 664                 $this->mHeadItems[$name] = $value;
 665         }
 666
 667         /**
 668          * Add one or more head items to the output
 669          *
 670          * @since 1.28
 671          * @param string|string[] $value Raw HTML
 672          */
 673         public function addHeadItems( $values ) {
 674                 $this->mHeadItems = array_merge( $this->mHeadItems, (array)$values );
 675         }
 676
 677         /**
 678          * Check if the header item $name is already set
 679          *
 680          * @param string $name Item name
 681          * @return bool
 682          */
 683         public function hasHeadItem( $name ) {
 684                 return isset( $this->mHeadItems[$name] );
 685         }
 686
 687         /**
 688          * @deprecated since 1.28 Obsolete - wgUseETag experiment was removed.
 689          * @param string $tag
 690          */
 691         public function setETag( $tag ) {
 692         }
 693
 694         /**
 695          * Set whether the output should only contain the body of the article,
 696          * without any skin, sidebar, etc.
 697          * Used e.g. when calling with "action=render".
 698          *
 699          * @param bool $only Whether to output only the body of the article
 700          */
 701         public function setArticleBodyOnly( $only ) {
 702                 $this->mArticleBodyOnly = $only;
 703         }
 704
 705         /**
 706          * Return whether the output will contain only the body of the article
 707          *
 708          * @return bool
 709          */
 710         public function getArticleBodyOnly() {
 711                 return $this->mArticleBodyOnly;
 712         }
 713
 714         /**
 715          * Set an additional output property
 716          * @since 1.21
 717          *
 718          * @param string $name
 719          * @param mixed $value
 720          */
 721         public function setProperty( $name, $value ) {
 722                 $this->mProperties[$name] = $value;
 723         }
 724
 725         /**
 726          * Get an additional output property
 727          * @since 1.21
 728          *
 729          * @param string $name
 730          * @return mixed Property value or null if not found
 731          */
 732         public function getProperty( $name ) {
 733                 if ( isset( $this->mProperties[$name] ) ) {
 734                         return $this->mProperties[$name];
 735                 } else {
 736                         return null;
 737                 }
 738         }
 739
 740         /**
 741          * checkLastModified tells the client to use the client-cached page if
 742          * possible. If successful, the OutputPage is disabled so that
 743          * any future call to OutputPage->output() have no effect.
 744          *
 745          * Side effect: sets mLastModified for Last-Modified header
 746          *
 747          * @param string $timestamp
 748          *
 749          * @return bool True if cache-ok headers was sent.
 750          */
 751         public function checkLastModified( $timestamp ) {
 752                 if ( !$timestamp || $timestamp == '19700101000000' ) {
 753                         wfDebug( __METHOD__ . ": CACHE DISABLED, NO TIMESTAMP\n" );
 754                         return false;
 755                 }
 756                 $config = $this->getConfig();
 757                 if ( !$config->get( 'CachePages' ) ) {
 758                         wfDebug( __METHOD__ . ": CACHE DISABLED\n" );
 759                         return false;
 760                 }
 761
 762                 $timestamp = wfTimestamp( TS_MW, $timestamp );
 763                 $modifiedTimes = [
 764                         'page' => $timestamp,
 765                         'user' => $this->getUser()->getTouched(),
 766                         'epoch' => $config->get( 'CacheEpoch' )
 767                 ];
 768                 if ( $config->get( 'UseSquid' ) ) {
 769                         // bug 44570: the core page itself may not change, but resources might
 770                         $modifiedTimes['sepoch'] = wfTimestamp( TS_MW, time() - $config->get( 'SquidMaxage' ) );
 771                 }
 772                 Hooks::run( 'OutputPageCheckLastModified', [ &$modifiedTimes, $this ] );
 773
 774                 $maxModified = max( $modifiedTimes );
 775                 $this->mLastModified = wfTimestamp( TS_RFC2822, $maxModified );
 776
 777                 $clientHeader = $this->getRequest()->getHeader( 'If-Modified-Since' );
 778                 if ( $clientHeader === false ) {
 779                         wfDebug( __METHOD__ . ": client did not send If-Modified-Since header", 'private' );
 780                         return false;
 781                 }
 782
 783                 # IE sends sizes after the date like this:
 784                 # Wed, 20 Aug 2003 06:51:19 GMT; length=5202
 785                 # this breaks strtotime().
 786                 $clientHeader = preg_replace( '/;.*$/', '', $clientHeader );
 787
 788                 MediaWiki\suppressWarnings(); // E_STRICT system time bitching
 789                 $clientHeaderTime = strtotime( $clientHeader );
 790                 MediaWiki\restoreWarnings();
 791                 if ( !$clientHeaderTime ) {
 792                         wfDebug( __METHOD__
 793                                 . ": unable to parse the client's If-Modified-Since header: $clientHeader\n" );
 794                         return false;
 795                 }
 796                 $clientHeaderTime = wfTimestamp( TS_MW, $clientHeaderTime );
 797
 798                 # Make debug info
 799                 $info = '';
 800                 foreach ( $modifiedTimes as $name => $value ) {
 801                         if ( $info !== '' ) {
 802                                 $info .= ', ';
 803                         }
 804                         $info .= "$name=" . wfTimestamp( TS_ISO_8601, $value );
 805                 }
 806
 807                 wfDebug( __METHOD__ . ": client sent If-Modified-Since: " .
 808                         wfTimestamp( TS_ISO_8601, $clientHeaderTime ), 'private' );
 809                 wfDebug( __METHOD__ . ": effective Last-Modified: " .
 810                         wfTimestamp( TS_ISO_8601, $maxModified ), 'private' );
 811                 if ( $clientHeaderTime < $maxModified ) {
 812                         wfDebug( __METHOD__ . ": STALE, $info", 'private' );
 813                         return false;
 814                 }
 815
 816                 # Not modified
 817                 # Give a 304 Not Modified response code and disable body output
 818                 wfDebug( __METHOD__ . ": NOT MODIFIED, $info", 'private' );
 819                 ini_set( 'zlib.output_compression', 0 );
 820                 $this->getRequest()->response()->statusHeader( 304 );
 821                 $this->sendCacheControl();
 822                 $this->disable();
 823
 824                 // Don't output a compressed blob when using ob_gzhandler;
 825                 // it's technically against HTTP spec and seems to confuse
 826                 // Firefox when the response gets split over two packets.
 827                 wfClearOutputBuffers();
 828
 829                 return true;
 830         }
 831
 832         /**
 833          * Override the last modified timestamp
 834          *
 835          * @param string $timestamp New timestamp, in a format readable by
 836          *        wfTimestamp()
 837          */
 838         public function setLastModified( $timestamp ) {
 839                 $this->mLastModified = wfTimestamp( TS_RFC2822, $timestamp );
 840         }
 841
 842         /**
 843          * Set the robot policy for the page: <http://www.robotstxt.org/meta.html>
 844          *
 845          * @param string $policy The literal string to output as the contents of
 846          *   the meta tag.  Will be parsed according to the spec and output in
 847          *   standardized form.
 848          * @return null
 849          */
 850         public function setRobotPolicy( $policy ) {
 851                 $policy = Article::formatRobotPolicy( $policy );
 852
 853                 if ( isset( $policy['index'] ) ) {
 854                         $this->setIndexPolicy( $policy['index'] );
 855                 }
 856                 if ( isset( $policy['follow'] ) ) {
 857                         $this->setFollowPolicy( $policy['follow'] );
 858                 }
 859         }
 860
 861         /**
 862          * Set the index policy for the page, but leave the follow policy un-
 863          * touched.
 864          *
 865          * @param string $policy Either 'index' or 'noindex'.
 866          * @return null
 867          */
 868         public function setIndexPolicy( $policy ) {
 869                 $policy = trim( $policy );
 870                 if ( in_array( $policy, [ 'index', 'noindex' ] ) ) {
 871                         $this->mIndexPolicy = $policy;
 872                 }
 873         }
 874
 875         /**
 876          * Set the follow policy for the page, but leave the index policy un-
 877          * touched.
 878          *
 879          * @param string $policy Either 'follow' or 'nofollow'.
 880          * @return null
 881          */
 882         public function setFollowPolicy( $policy ) {
 883                 $policy = trim( $policy );
 884                 if ( in_array( $policy, [ 'follow', 'nofollow' ] ) ) {
 885                         $this->mFollowPolicy = $policy;
 886                 }
 887         }
 888
 889         /**
 890          * Set the new value of the "action text", this will be added to the
 891          * "HTML title", separated from it with " - ".
 892          *
 893          * @param string $text New value of the "action text"
 894          */
 895         public function setPageTitleActionText( $text ) {
 896                 $this->mPageTitleActionText = $text;
 897         }
 898
 899         /**
 900          * Get the value of the "action text"
 901          *
 902          * @return string
 903          */
 904         public function getPageTitleActionText() {
 905                 return $this->mPageTitleActionText;
 906         }
 907
 908         /**
 909          * "HTML title" means the contents of "<title>".
 910          * It is stored as plain, unescaped text and will be run through htmlspecialchars in the skin file.
 911          *
 912          * @param string|Message $name
 913          */
 914         public function setHTMLTitle( $name ) {
 915                 if ( $name instanceof Message ) {
 916                         $this->mHTMLtitle = $name->setContext( $this->getContext() )->text();
 917                 } else {
 918                         $this->mHTMLtitle = $name;
 919                 }
 920         }
 921
 922         /**
 923          * Return the "HTML title", i.e. the content of the "<title>" tag.
 924          *
 925          * @return string
 926          */
 927         public function getHTMLTitle() {
 928                 return $this->mHTMLtitle;
 929         }
 930
 931         /**
 932          * Set $mRedirectedFrom, the Title of the page which redirected us to the current page.
 933          *
 934          * @param Title $t
 935          */
 936         public function setRedirectedFrom( $t ) {
 937                 $this->mRedirectedFrom = $t;
 938         }
 939
 940         /**
 941          * "Page title" means the contents of \<h1\>. It is stored as a valid HTML
 942          * fragment. This function allows good tags like \<sup\> in the \<h1\> tag,
 943          * but not bad tags like \<script\>. This function automatically sets
 944          * \<title\> to the same content as \<h1\> but with all tags removed. Bad
 945          * tags that were escaped in \<h1\> will still be escaped in \<title\>, and
 946          * good tags like \<i\> will be dropped entirely.
 947          *
 948          * @param string|Message $name
 949          */
 950         public function setPageTitle( $name ) {
 951                 if ( $name instanceof Message ) {
 952                         $name = $name->setContext( $this->getContext() )->text();
 953                 }
 954
 955                 # change "<script>foo&bar</script>" to "&lt;script&gt;foo&amp;bar&lt;/script&gt;"
 956                 # but leave "<i>foobar</i>" alone
 957                 $nameWithTags = Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags( $name ) );
 958                 $this->mPagetitle = $nameWithTags;
 959
 960                 # change "<i>foo&amp;bar</i>" to "foo&bar"
 961                 $this->setHTMLTitle(
 962                         $this->msg( 'pagetitle' )->rawParams( Sanitizer::stripAllTags( $nameWithTags ) )
 963                                 ->inContentLanguage()
 964                 );
 965         }
 966
 967         /**
 968          * Return the "page title", i.e. the content of the \<h1\> tag.
 969          *
 970          * @return string
 971          */
 972         public function getPageTitle() {
 973                 return $this->mPagetitle;
 974         }
 975
 976         /**
 977          * Set the Title object to use
 978          *
 979          * @param Title $t
 980          */
 981         public function setTitle( Title $t ) {
 982                 $this->getContext()->setTitle( $t );
 983         }
 984
 985         /**
 986          * Replace the subtitle with $str
 987          *
 988          * @param string|Message $str New value of the subtitle. String should be safe HTML.
 989          */
 990         public function setSubtitle( $str ) {
 991                 $this->clearSubtitle();
 992                 $this->addSubtitle( $str );
 993         }
 994
 995         /**
 996          * Add $str to the subtitle
 997          *
 998          * @param string|Message $str String or Message to add to the subtitle. String should be safe HTML.
 999          */
1000         public function addSubtitle( $str ) {
1001                 if ( $str instanceof Message ) {
1002                         $this->mSubtitle[] = $str->setContext( $this->getContext() )->parse();
1003                 } else {
1004                         $this->mSubtitle[] = $str;
1005                 }
1006         }
1007
1008         /**
1009          * Build message object for a subtitle containing a backlink to a page
1010          *
1011          * @param Title $title Title to link to
1012          * @param array $query Array of additional parameters to include in the link
1013          * @return Message
1014          * @since 1.25
1015          */
1016         public static function buildBacklinkSubtitle( Title $title, $query = [] ) {
1017                 if ( $title->isRedirect() ) {
1018                         $query['redirect'] = 'no';
1019                 }
1020                 return wfMessage( 'backlinksubtitle' )
1021                         ->rawParams( Linker::link( $title, null, [], $query ) );
1022         }
1023
1024         /**
1025          * Add a subtitle containing a backlink to a page
1026          *
1027          * @param Title $title Title to link to
1028          * @param array $query Array of additional parameters to include in the link
1029          */
1030         public function addBacklinkSubtitle( Title $title, $query = [] ) {
1031                 $this->addSubtitle( self::buildBacklinkSubtitle( $title, $query ) );
1032         }
1033
1034         /**
1035          * Clear the subtitles
1036          */
1037         public function clearSubtitle() {
1038                 $this->mSubtitle = [];
1039         }
1040
1041         /**
1042          * Get the subtitle
1043          *
1044          * @return string
1045          */
1046         public function getSubtitle() {
1047                 return implode( "<br />\n\t\t\t\t", $this->mSubtitle );
1048         }
1049
1050         /**
1051          * Set the page as printable, i.e. it'll be displayed with all
1052          * print styles included
1053          */
1054         public function setPrintable() {
1055                 $this->mPrintable = true;
1056         }
1057
1058         /**
1059          * Return whether the page is "printable"
1060          *
1061          * @return bool
1062          */
1063         public function isPrintable() {
1064                 return $this->mPrintable;
1065         }
1066
1067         /**
1068          * Disable output completely, i.e. calling output() will have no effect
1069          */
1070         public function disable() {
1071                 $this->mDoNothing = true;
1072         }
1073
1074         /**
1075          * Return whether the output will be completely disabled
1076          *
1077          * @return bool
1078          */
1079         public function isDisabled() {
1080                 return $this->mDoNothing;
1081         }
1082
1083         /**
1084          * Show an "add new section" link?
1085          *
1086          * @return bool
1087          */
1088         public function showNewSectionLink() {
1089                 return $this->mNewSectionLink;
1090         }
1091
1092         /**
1093          * Forcibly hide the new section link?
1094          *
1095          * @return bool
1096          */
1097         public function forceHideNewSectionLink() {
1098                 return $this->mHideNewSectionLink;
1099         }
1100
1101         /**
1102          * Add or remove feed links in the page header
1103          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
1104          * for the new version
1105          * @see addFeedLink()
1106          *
1107          * @param bool $show True: add default feeds, false: remove all feeds
1108          */
1109         public function setSyndicated( $show = true ) {
1110                 if ( $show ) {
1111                         $this->setFeedAppendQuery( false );
1112                 } else {
1113                         $this->mFeedLinks = [];
1114                 }
1115         }
1116
1117         /**
1118          * Add default feeds to the page header
1119          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
1120          * for the new version
1121          * @see addFeedLink()
1122          *
1123          * @param string $val Query to append to feed links or false to output
1124          *        default links
1125          */
1126         public function setFeedAppendQuery( $val ) {
1127                 $this->mFeedLinks = [];
1128
1129                 foreach ( $this->getConfig()->get( 'AdvertisedFeedTypes' ) as $type ) {
1130                         $query = "feed=$type";
1131                         if ( is_string( $val ) ) {
1132                                 $query .= '&' . $val;
1133                         }
1134                         $this->mFeedLinks[$type] = $this->getTitle()->getLocalURL( $query );
1135                 }
1136         }
1137
1138         /**
1139          * Add a feed link to the page header
1140          *
1141          * @param string $format Feed type, should be a key of $wgFeedClasses
1142          * @param string $href URL
1143          */
1144         public function addFeedLink( $format, $href ) {
1145                 if ( in_array( $format, $this->getConfig()->get( 'AdvertisedFeedTypes' ) ) ) {
1146                         $this->mFeedLinks[$format] = $href;
1147                 }
1148         }
1149
1150         /**
1151          * Should we output feed links for this page?
1152          * @return bool
1153          */
1154         public function isSyndicated() {
1155                 return count( $this->mFeedLinks ) > 0;
1156         }
1157
1158         /**
1159          * Return URLs for each supported syndication format for this page.
1160          * @return array Associating format keys with URLs
1161          */
1162         public function getSyndicationLinks() {
1163                 return $this->mFeedLinks;
1164         }
1165
1166         /**
1167          * Will currently always return null
1168          *
1169          * @return null
1170          */
1171         public function getFeedAppendQuery() {
1172                 return $this->mFeedLinksAppendQuery;
1173         }
1174
1175         /**
1176          * Set whether the displayed content is related to the source of the
1177          * corresponding article on the wiki
1178          * Setting true will cause the change "article related" toggle to true
1179          *
1180          * @param bool $v
1181          */
1182         public function setArticleFlag( $v ) {
1183                 $this->mIsarticle = $v;
1184                 if ( $v ) {
1185                         $this->mIsArticleRelated = $v;
1186                 }
1187         }
1188
1189         /**
1190          * Return whether the content displayed page is related to the source of
1191          * the corresponding article on the wiki
1192          *
1193          * @return bool
1194          */
1195         public function isArticle() {
1196                 return $this->mIsarticle;
1197         }
1198
1199         /**
1200          * Set whether this page is related an article on the wiki
1201          * Setting false will cause the change of "article flag" toggle to false
1202          *
1203          * @param bool $v
1204          */
1205         public function setArticleRelated( $v ) {
1206                 $this->mIsArticleRelated = $v;
1207                 if ( !$v ) {
1208                         $this->mIsarticle = false;
1209                 }
1210         }
1211
1212         /**
1213          * Return whether this page is related an article on the wiki
1214          *
1215          * @return bool
1216          */
1217         public function isArticleRelated() {
1218                 return $this->mIsArticleRelated;
1219         }
1220
1221         /**
1222          * Add new language links
1223          *
1224          * @param array $newLinkArray Associative array mapping language code to the page
1225          *                      name
1226          */
1227         public function addLanguageLinks( array $newLinkArray ) {
1228                 $this->mLanguageLinks += $newLinkArray;
1229         }
1230
1231         /**
1232          * Reset the language links and add new language links
1233          *
1234          * @param array $newLinkArray Associative array mapping language code to the page
1235          *                      name
1236          */
1237         public function setLanguageLinks( array $newLinkArray ) {
1238                 $this->mLanguageLinks = $newLinkArray;
1239         }
1240
1241         /**
1242          * Get the list of language links
1243          *
1244          * @return array Array of Interwiki Prefixed (non DB key) Titles (e.g. 'fr:Test page')
1245          */
1246         public function getLanguageLinks() {
1247                 return $this->mLanguageLinks;
1248         }
1249
1250         /**
1251          * Add an array of categories, with names in the keys
1252          *
1253          * @param array $categories Mapping category name => sort key
1254          */
1255         public function addCategoryLinks( array $categories ) {
1256                 global $wgContLang;
1257
1258                 if ( !is_array( $categories ) || count( $categories ) == 0 ) {
1259                         return;
1260                 }
1261
1262                 # Add the links to a LinkBatch
1263                 $arr = [ NS_CATEGORY => $categories ];
1264                 $lb = new LinkBatch;
1265                 $lb->setArray( $arr );
1266
1267                 # Fetch existence plus the hiddencat property
1268                 $dbr = wfGetDB( DB_SLAVE );
1269                 $fields = array_merge(
1270                         LinkCache::getSelectFields(),
1271                         [ 'page_namespace', 'page_title', 'pp_value' ]
1272                 );
1273
1274                 $res = $dbr->select( [ 'page', 'page_props' ],
1275                         $fields,
1276                         $lb->constructSet( 'page', $dbr ),
1277                         __METHOD__,
1278                         [],
1279                         [ 'page_props' => [ 'LEFT JOIN', [
1280                                 'pp_propname' => 'hiddencat',
1281                                 'pp_page = page_id'
1282                         ] ] ]
1283                 );
1284
1285                 # Add the results to the link cache
1286                 $lb->addResultToCache( LinkCache::singleton(), $res );
1287
1288                 # Set all the values to 'normal'.
1289                 $categories = array_fill_keys( array_keys( $categories ), 'normal' );
1290
1291                 # Mark hidden categories
1292                 foreach ( $res as $row ) {
1293                         if ( isset( $row->pp_value ) ) {
1294                                 $categories[$row->page_title] = 'hidden';
1295                         }
1296                 }
1297
1298                 # Add the remaining categories to the skin
1299                 if ( Hooks::run(
1300                         'OutputPageMakeCategoryLinks',
1301                         [ &$this, $categories, &$this->mCategoryLinks ] )
1302                 ) {
1303                         foreach ( $categories as $category => $type ) {
1304                                 // array keys will cast numeric category names to ints, so cast back to string
1305                                 $category = (string)$category;
1306                                 $origcategory = $category;
1307                                 $title = Title::makeTitleSafe( NS_CATEGORY, $category );
1308                                 if ( !$title ) {
1309                                         continue;
1310                                 }
1311                                 $wgContLang->findVariantLink( $category, $title, true );
1312                                 if ( $category != $origcategory && array_key_exists( $category, $categories ) ) {
1313                                         continue;
1314                                 }
1315                                 $text = $wgContLang->convertHtml( $title->getText() );
1316                                 $this->mCategories[] = $title->getText();
1317                                 $this->mCategoryLinks[$type][] = Linker::link( $title, $text );
1318                         }
1319                 }
1320         }
1321
1322         /**
1323          * Reset the category links (but not the category list) and add $categories
1324          *
1325          * @param array $categories Mapping category name => sort key
1326          */
1327         public function setCategoryLinks( array $categories ) {
1328                 $this->mCategoryLinks = [];
1329                 $this->addCategoryLinks( $categories );
1330         }
1331
1332         /**
1333          * Get the list of category links, in a 2-D array with the following format:
1334          * $arr[$type][] = $link, where $type is either "normal" or "hidden" (for
1335          * hidden categories) and $link a HTML fragment with a link to the category
1336          * page
1337          *
1338          * @return array
1339          */
1340         public function getCategoryLinks() {
1341                 return $this->mCategoryLinks;
1342         }
1343
1344         /**
1345          * Get the list of category names this page belongs to
1346          *
1347          * @return array Array of strings
1348          */
1349         public function getCategories() {
1350                 return $this->mCategories;
1351         }
1352
1353         /**
1354          * Add an array of indicators, with their identifiers as array
1355          * keys and HTML contents as values.
1356          *
1357          * In case of duplicate keys, existing values are overwritten.
1358          *
1359          * @param array $indicators
1360          * @since 1.25
1361          */
1362         public function setIndicators( array $indicators ) {
1363                 $this->mIndicators = $indicators + $this->mIndicators;
1364                 // Keep ordered by key
1365                 ksort( $this->mIndicators );
1366         }
1367
1368         /**
1369          * Get the indicators associated with this page.
1370          *
1371          * The array will be internally ordered by item keys.
1372          *
1373          * @return array Keys: identifiers, values: HTML contents
1374          * @since 1.25
1375          */
1376         public function getIndicators() {
1377                 return $this->mIndicators;
1378         }
1379
1380         /**
1381          * Adds help link with an icon via page indicators.
1382          * Link target can be overridden by a local message containing a wikilink:
1383          * the message key is: lowercase action or special page name + '-helppage'.
1384          * @param string $to Target MediaWiki.org page title or encoded URL.
1385          * @param bool $overrideBaseUrl Whether $url is a full URL, to avoid MW.o.
1386          * @since 1.25
1387          */
1388         public function addHelpLink( $to, $overrideBaseUrl = false ) {
1389                 $this->addModuleStyles( 'mediawiki.helplink' );
1390                 $text = $this->msg( 'helppage-top-gethelp' )->escaped();
1391
1392                 if ( $overrideBaseUrl ) {
1393                         $helpUrl = $to;
1394                 } else {
1395                         $toUrlencoded = wfUrlencode( str_replace( ' ', '_', $to ) );
1396                         $helpUrl = "//www.mediawiki.org/wiki/Special:MyLanguage/$toUrlencoded";
1397                 }
1398
1399                 $link = Html::rawElement(
1400                         'a',
1401                         [
1402                                 'href' => $helpUrl,
1403                                 'target' => '_blank',
1404                                 'class' => 'mw-helplink',
1405                         ],
1406                         $text
1407                 );
1408
1409                 $this->setIndicators( [ 'mw-helplink' => $link ] );
1410         }
1411
1412         /**
1413          * Do not allow scripts which can be modified by wiki users to load on this page;
1414          * only allow scripts bundled with, or generated by, the software.
1415          * Site-wide styles are controlled by a config setting, since they can be
1416          * used to create a custom skin/theme, but not user-specific ones.
1417          *
1418          * @todo this should be given a more accurate name
1419          */
1420         public function disallowUserJs() {
1421                 $this->reduceAllowedModules(
1422                         ResourceLoaderModule::TYPE_SCRIPTS,
1423                         ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL
1424                 );
1425
1426                 // Site-wide styles are controlled by a config setting, see bug 71621
1427                 // for background on why. User styles are never allowed.
1428                 if ( $this->getConfig()->get( 'AllowSiteCSSOnRestrictedPages' ) ) {
1429                         $styleOrigin = ResourceLoaderModule::ORIGIN_USER_SITEWIDE;
1430                 } else {
1431                         $styleOrigin = ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL;
1432                 }
1433                 $this->reduceAllowedModules(
1434                         ResourceLoaderModule::TYPE_STYLES,
1435                         $styleOrigin
1436                 );
1437         }
1438
1439         /**
1440          * Show what level of JavaScript / CSS untrustworthiness is allowed on this page
1441          * @see ResourceLoaderModule::$origin
1442          * @param string $type ResourceLoaderModule TYPE_ constant
1443          * @return int ResourceLoaderModule ORIGIN_ class constant
1444          */
1445         public function getAllowedModules( $type ) {
1446                 if ( $type == ResourceLoaderModule::TYPE_COMBINED ) {
1447                         return min( array_values( $this->mAllowedModules ) );
1448                 } else {
1449                         return isset( $this->mAllowedModules[$type] )
1450                                 ? $this->mAllowedModules[$type]
1451                                 : ResourceLoaderModule::ORIGIN_ALL;
1452                 }
1453         }
1454
1455         /**
1456          * Limit the highest level of CSS/JS untrustworthiness allowed.
1457          *
1458          * If passed the same or a higher level than the current level of untrustworthiness set, the
1459          * level will remain unchanged.
1460          *
1461          * @param string $type
1462          * @param int $level ResourceLoaderModule class constant
1463          */
1464         public function reduceAllowedModules( $type, $level ) {
1465                 $this->mAllowedModules[$type] = min( $this->getAllowedModules( $type ), $level );
1466         }
1467
1468         /**
1469          * Prepend $text to the body HTML
1470          *
1471          * @param string $text HTML
1472          */
1473         public function prependHTML( $text ) {
1474                 $this->mBodytext = $text . $this->mBodytext;
1475         }
1476
1477         /**
1478          * Append $text to the body HTML
1479          *
1480          * @param string $text HTML
1481          */
1482         public function addHTML( $text ) {
1483                 $this->mBodytext .= $text;
1484         }
1485
1486         /**
1487          * Shortcut for adding an Html::element via addHTML.
1488          *
1489          * @since 1.19
1490          *
1491          * @param string $element
1492          * @param array $attribs
1493          * @param string $contents
1494          */
1495         public function addElement( $element, array $attribs = [], $contents = '' ) {
1496                 $this->addHTML( Html::element( $element, $attribs, $contents ) );
1497         }
1498
1499         /**
1500          * Clear the body HTML
1501          */
1502         public function clearHTML() {
1503                 $this->mBodytext = '';
1504         }
1505
1506         /**
1507          * Get the body HTML
1508          *
1509          * @return string HTML
1510          */
1511         public function getHTML() {
1512                 return $this->mBodytext;
1513         }
1514
1515         /**
1516          * Get/set the ParserOptions object to use for wikitext parsing
1517          *
1518          * @param ParserOptions|null $options Either the ParserOption to use or null to only get the
1519          *   current ParserOption object
1520          * @return ParserOptions
1521          */
1522         public function parserOptions( $options = null ) {
1523                 if ( $options !== null && !empty( $options->isBogus ) ) {
1524                         // Someone is trying to set a bogus pre-$wgUser PO. Check if it has
1525                         // been changed somehow, and keep it if so.
1526                         $anonPO = ParserOptions::newFromAnon();
1527                         $anonPO->setEditSection( false );
1528                         if ( !$options->matches( $anonPO ) ) {
1529                                 wfLogWarning( __METHOD__ . ': Setting a changed bogus ParserOptions: ' . wfGetAllCallers( 5 ) );
1530                                 $options->isBogus = false;
1531                         }
1532                 }
1533
1534                 if ( !$this->mParserOptions ) {
1535                         if ( !$this->getContext()->getUser()->isSafeToLoad() ) {
1536                                 // $wgUser isn't unstubbable yet, so don't try to get a
1537                                 // ParserOptions for it. And don't cache this ParserOptions
1538                                 // either.
1539                                 $po = ParserOptions::newFromAnon();
1540                                 $po->setEditSection( false );
1541                                 $po->isBogus = true;
1542                                 if ( $options !== null ) {
1543                                         $this->mParserOptions = empty( $options->isBogus ) ? $options : null;
1544                                 }
1545                                 return $po;
1546                         }
1547
1548                         $this->mParserOptions = ParserOptions::newFromContext( $this->getContext() );
1549                         $this->mParserOptions->setEditSection( false );
1550                 }
1551
1552                 if ( $options !== null && !empty( $options->isBogus ) ) {
1553                         // They're trying to restore the bogus pre-$wgUser PO. Do the right
1554                         // thing.
1555                         return wfSetVar( $this->mParserOptions, null, true );
1556                 } else {
1557                         return wfSetVar( $this->mParserOptions, $options );
1558                 }
1559         }
1560
1561         /**
1562          * Set the revision ID which will be seen by the wiki text parser
1563          * for things such as embedded {{REVISIONID}} variable use.
1564          *
1565          * @param int|null $revid An positive integer, or null
1566          * @return mixed Previous value
1567          */
1568         public function setRevisionId( $revid ) {
1569                 $val = is_null( $revid ) ? null : intval( $revid );
1570                 return wfSetVar( $this->mRevisionId, $val );
1571         }
1572
1573         /**
1574          * Get the displayed revision ID
1575          *
1576          * @return int
1577          */
1578         public function getRevisionId() {
1579                 return $this->mRevisionId;
1580         }
1581
1582         /**
1583          * Set the timestamp of the revision which will be displayed. This is used
1584          * to avoid a extra DB call in Skin::lastModified().
1585          *
1586          * @param string|null $timestamp
1587          * @return mixed Previous value
1588          */
1589         public function setRevisionTimestamp( $timestamp ) {
1590                 return wfSetVar( $this->mRevisionTimestamp, $timestamp );
1591         }
1592
1593         /**
1594          * Get the timestamp of displayed revision.
1595          * This will be null if not filled by setRevisionTimestamp().
1596          *
1597          * @return string|null
1598          */
1599         public function getRevisionTimestamp() {
1600                 return $this->mRevisionTimestamp;
1601         }
1602
1603         /**
1604          * Set the displayed file version
1605          *
1606          * @param File|bool $file
1607          * @return mixed Previous value
1608          */
1609         public function setFileVersion( $file ) {
1610                 $val = null;
1611                 if ( $file instanceof File && $file->exists() ) {
1612                         $val = [ 'time' => $file->getTimestamp(), 'sha1' => $file->getSha1() ];
1613                 }
1614                 return wfSetVar( $this->mFileVersion, $val, true );
1615         }
1616
1617         /**
1618          * Get the displayed file version
1619          *
1620          * @return array|null ('time' => MW timestamp, 'sha1' => sha1)
1621          */
1622         public function getFileVersion() {
1623                 return $this->mFileVersion;
1624         }
1625
1626         /**
1627          * Get the templates used on this page
1628          *
1629          * @return array (namespace => dbKey => revId)
1630          * @since 1.18
1631          */
1632         public function getTemplateIds() {
1633                 return $this->mTemplateIds;
1634         }
1635
1636         /**
1637          * Get the files used on this page
1638          *
1639          * @return array (dbKey => array('time' => MW timestamp or null, 'sha1' => sha1 or ''))
1640          * @since 1.18
1641          */
1642         public function getFileSearchOptions() {
1643                 return $this->mImageTimeKeys;
1644         }
1645
1646         /**
1647          * Convert wikitext to HTML and add it to the buffer
1648          * Default assumes that the current page title will be used.
1649          *
1650          * @param string $text
1651          * @param bool $linestart Is this the start of a line?
1652          * @param bool $interface Is this text in the user interface language?
1653          * @throws MWException
1654          */
1655         public function addWikiText( $text, $linestart = true, $interface = true ) {
1656                 $title = $this->getTitle(); // Work around E_STRICT
1657                 if ( !$title ) {
1658                         throw new MWException( 'Title is null' );
1659                 }
1660                 $this->addWikiTextTitle( $text, $title, $linestart, /*tidy*/false, $interface );
1661         }
1662
1663         /**
1664          * Add wikitext with a custom Title object
1665          *
1666          * @param string $text Wikitext
1667          * @param Title $title
1668          * @param bool $linestart Is this the start of a line?
1669          */
1670         public function addWikiTextWithTitle( $text, &$title, $linestart = true ) {
1671                 $this->addWikiTextTitle( $text, $title, $linestart );
1672         }
1673
1674         /**
1675          * Add wikitext with a custom Title object and tidy enabled.
1676          *
1677          * @param string $text Wikitext
1678          * @param Title $title
1679          * @param bool $linestart Is this the start of a line?
1680          */
1681         function addWikiTextTitleTidy( $text, &$title, $linestart = true ) {
1682                 $this->addWikiTextTitle( $text, $title, $linestart, true );
1683         }
1684
1685         /**
1686          * Add wikitext with tidy enabled
1687          *
1688          * @param string $text Wikitext
1689          * @param bool $linestart Is this the start of a line?
1690          */
1691         public function addWikiTextTidy( $text, $linestart = true ) {
1692                 $title = $this->getTitle();
1693                 $this->addWikiTextTitleTidy( $text, $title, $linestart );
1694         }
1695
1696         /**
1697          * Add wikitext with a custom Title object
1698          *
1699          * @param string $text Wikitext
1700          * @param Title $title
1701          * @param bool $linestart Is this the start of a line?
1702          * @param bool $tidy Whether to use tidy
1703          * @param bool $interface Whether it is an interface message
1704          *   (for example disables conversion)
1705          */
1706         public function addWikiTextTitle( $text, Title $title, $linestart,
1707                 $tidy = false, $interface = false
1708         ) {
1709                 global $wgParser;
1710
1711                 $popts = $this->parserOptions();
1712                 $oldTidy = $popts->setTidy( $tidy );
1713                 $popts->setInterfaceMessage( (bool)$interface );
1714
1715                 $parserOutput = $wgParser->getFreshParser()->parse(
1716                         $text, $title, $popts,
1717                         $linestart, true, $this->mRevisionId
1718                 );
1719
1720                 $popts->setTidy( $oldTidy );
1721
1722                 $this->addParserOutput( $parserOutput );
1723
1724         }
1725
1726         /**
1727          * Add a ParserOutput object, but without Html.
1728          *
1729          * @deprecated since 1.24, use addParserOutputMetadata() instead.
1730          * @param ParserOutput $parserOutput
1731          */
1732         public function addParserOutputNoText( $parserOutput ) {
1733                 wfDeprecated( __METHOD__, '1.24' );
1734                 $this->addParserOutputMetadata( $parserOutput );
1735         }
1736
1737         /**
1738          * Add all metadata associated with a ParserOutput object, but without the actual HTML. This
1739          * includes categories, language links, ResourceLoader modules, effects of certain magic words,
1740          * and so on.
1741          *
1742          * @since 1.24
1743          * @param ParserOutput $parserOutput
1744          */
1745         public function addParserOutputMetadata( $parserOutput ) {
1746                 $this->mLanguageLinks += $parserOutput->getLanguageLinks();
1747                 $this->addCategoryLinks( $parserOutput->getCategories() );
1748                 $this->setIndicators( $parserOutput->getIndicators() );
1749                 $this->mNewSectionLink = $parserOutput->getNewSection();
1750                 $this->mHideNewSectionLink = $parserOutput->getHideNewSection();
1751
1752                 if ( !$parserOutput->isCacheable() ) {
1753                         $this->enableClientCache( false );
1754                 }
1755                 $this->mNoGallery = $parserOutput->getNoGallery();
1756                 $this->mHeadItems = array_merge( $this->mHeadItems, $parserOutput->getHeadItems() );
1757                 $this->addModules( $parserOutput->getModules() );
1758                 $this->addModuleScripts( $parserOutput->getModuleScripts() );
1759                 $this->addModuleStyles( $parserOutput->getModuleStyles() );
1760                 $this->addJsConfigVars( $parserOutput->getJsConfigVars() );
1761                 $this->mPreventClickjacking = $this->mPreventClickjacking
1762                         || $parserOutput->preventClickjacking();
1763
1764                 // Template versioning...
1765                 foreach ( (array)$parserOutput->getTemplateIds() as $ns => $dbks ) {
1766                         if ( isset( $this->mTemplateIds[$ns] ) ) {
1767                                 $this->mTemplateIds[$ns] = $dbks + $this->mTemplateIds[$ns];
1768                         } else {
1769                                 $this->mTemplateIds[$ns] = $dbks;
1770                         }
1771                 }
1772                 // File versioning...
1773                 foreach ( (array)$parserOutput->getFileSearchOptions() as $dbk => $data ) {
1774                         $this->mImageTimeKeys[$dbk] = $data;
1775                 }
1776
1777                 // Hooks registered in the object
1778                 $parserOutputHooks = $this->getConfig()->get( 'ParserOutputHooks' );
1779                 foreach ( $parserOutput->getOutputHooks() as $hookInfo ) {
1780                         list( $hookName, $data ) = $hookInfo;
1781                         if ( isset( $parserOutputHooks[$hookName] ) ) {
1782                                 call_user_func( $parserOutputHooks[$hookName], $this, $parserOutput, $data );
1783                         }
1784                 }
1785
1786                 // Enable OOUI if requested via ParserOutput
1787                 if ( $parserOutput->getEnableOOUI() ) {
1788                         $this->enableOOUI();
1789                 }
1790
1791                 // Include profiling data
1792                 $this->setLimitReportData( $parserOutput->getLimitReportData() );
1793
1794                 // Link flags are ignored for now, but may in the future be
1795                 // used to mark individual language links.
1796                 $linkFlags = [];
1797                 Hooks::run( 'LanguageLinks', [ $this->getTitle(), &$this->mLanguageLinks, &$linkFlags ] );
1798                 Hooks::run( 'OutputPageParserOutput', [ &$this, $parserOutput ] );
1799         }
1800
1801         /**
1802          * Add the HTML and enhancements for it (like ResourceLoader modules) associated with a
1803          * ParserOutput object, without any other metadata.
1804          *
1805          * @since 1.24
1806          * @param ParserOutput $parserOutput
1807          */
1808         public function addParserOutputContent( $parserOutput ) {
1809                 $this->addParserOutputText( $parserOutput );
1810
1811                 $this->addModules( $parserOutput->getModules() );
1812                 $this->addModuleScripts( $parserOutput->getModuleScripts() );
1813                 $this->addModuleStyles( $parserOutput->getModuleStyles() );
1814
1815                 $this->addJsConfigVars( $parserOutput->getJsConfigVars() );
1816         }
1817
1818         /**
1819          * Add the HTML associated with a ParserOutput object, without any metadata.
1820          *
1821          * @since 1.24
1822          * @param ParserOutput $parserOutput
1823          */
1824         public function addParserOutputText( $parserOutput ) {
1825                 $text = $parserOutput->getText();
1826                 Hooks::run( 'OutputPageBeforeHTML', [ &$this, &$text ] );
1827                 $this->addHTML( $text );
1828         }
1829
1830         /**
1831          * Add everything from a ParserOutput object.
1832          *
1833          * @param ParserOutput $parserOutput
1834          */
1835         function addParserOutput( $parserOutput ) {
1836                 $this->addParserOutputMetadata( $parserOutput );
1837                 $parserOutput->setTOCEnabled( $this->mEnableTOC );
1838
1839                 // Touch section edit links only if not previously disabled
1840                 if ( $parserOutput->getEditSectionTokens() ) {
1841                         $parserOutput->setEditSectionTokens( $this->mEnableSectionEditLinks );
1842                 }
1843
1844                 $this->addParserOutputText( $parserOutput );
1845         }
1846
1847         /**
1848          * Add the output of a QuickTemplate to the output buffer
1849          *
1850          * @param QuickTemplate $template
1851          */
1852         public function addTemplate( &$template ) {
1853                 $this->addHTML( $template->getHTML() );
1854         }
1855
1856         /**
1857          * Parse wikitext and return the HTML.
1858          *
1859          * @param string $text
1860          * @param bool $linestart Is this the start of a line?
1861          * @param bool $interface Use interface language ($wgLang instead of
1862          *   $wgContLang) while parsing language sensitive magic words like GRAMMAR and PLURAL.
1863          *   This also disables LanguageConverter.
1864          * @param Language $language Target language object, will override $interface
1865          * @throws MWException
1866          * @return string HTML
1867          */
1868         public function parse( $text, $linestart = true, $interface = false, $language = null ) {
1869                 global $wgParser;
1870
1871                 if ( is_null( $this->getTitle() ) ) {
1872                         throw new MWException( 'Empty $mTitle in ' . __METHOD__ );
1873                 }
1874
1875                 $popts = $this->parserOptions();
1876                 if ( $interface ) {
1877                         $popts->setInterfaceMessage( true );
1878                 }
1879                 if ( $language !== null ) {
1880                         $oldLang = $popts->setTargetLanguage( $language );
1881                 }
1882
1883                 $parserOutput = $wgParser->getFreshParser()->parse(
1884                         $text, $this->getTitle(), $popts,
1885                         $linestart, true, $this->mRevisionId
1886                 );
1887
1888                 if ( $interface ) {
1889                         $popts->setInterfaceMessage( false );
1890                 }
1891                 if ( $language !== null ) {
1892                         $popts->setTargetLanguage( $oldLang );
1893                 }
1894
1895                 return $parserOutput->getText();
1896         }
1897
1898         /**
1899          * Parse wikitext, strip paragraphs, and return the HTML.
1900          *
1901          * @param string $text
1902          * @param bool $linestart Is this the start of a line?
1903          * @param bool $interface Use interface language ($wgLang instead of
1904          *   $wgContLang) while parsing language sensitive magic
1905          *   words like GRAMMAR and PLURAL
1906          * @return string HTML
1907          */
1908         public function parseInline( $text, $linestart = true, $interface = false ) {
1909                 $parsed = $this->parse( $text, $linestart, $interface );
1910                 return Parser::stripOuterParagraph( $parsed );
1911         }
1912
1913         /**
1914          * @param $maxage
1915          * @deprecated since 1.27 Use setCdnMaxage() instead
1916          */
1917         public function setSquidMaxage( $maxage ) {
1918                 $this->setCdnMaxage( $maxage );
1919         }
1920
1921         /**
1922          * Set the value of the "s-maxage" part of the "Cache-control" HTTP header
1923          *
1924          * @param int $maxage Maximum cache time on the CDN, in seconds.
1925          */
1926         public function setCdnMaxage( $maxage ) {
1927                 $this->mCdnMaxage = min( $maxage, $this->mCdnMaxageLimit );
1928         }
1929
1930         /**
1931          * Lower the value of the "s-maxage" part of the "Cache-control" HTTP header
1932          *
1933          * @param int $maxage Maximum cache time on the CDN, in seconds
1934          * @since 1.27
1935          */
1936         public function lowerCdnMaxage( $maxage ) {
1937                 $this->mCdnMaxageLimit = min( $maxage, $this->mCdnMaxageLimit );
1938                 $this->setCdnMaxage( $this->mCdnMaxage );
1939         }
1940
1941         /**
1942          * Get TTL in [$minTTL,$maxTTL] in pass it to lowerCdnMaxage()
1943          *
1944          * This sets and returns $minTTL if $mtime is false or null. Otherwise,
1945          * the TTL is higher the older the $mtime timestamp is. Essentially, the
1946          * TTL is 90% of the age of the object, subject to the min and max.
1947          *
1948          * @param string|integer|float|bool|null $mtime Last-Modified timestamp
1949          * @param integer $minTTL Mimimum TTL in seconds [default: 1 minute]
1950          * @param integer $maxTTL Maximum TTL in seconds [default: $wgSquidMaxage]
1951          * @return integer TTL in seconds
1952          * @since 1.28
1953          */
1954         public function adaptCdnTTL( $mtime, $minTTL = 0, $maxTTL = 0 ) {
1955                 $minTTL = $minTTL ?: IExpiringStore::TTL_MINUTE;
1956                 $maxTTL = $maxTTL ?: $this->getConfig()->get( 'SquidMaxage' );
1957
1958                 if ( $mtime === null || $mtime === false ) {
1959                         return $minTTL; // entity does not exist
1960                 }
1961
1962                 $age = time() - wfTimestamp( TS_UNIX, $mtime );
1963                 $adaptiveTTL = max( .9 * $age, $minTTL );
1964                 $adaptiveTTL = min( $adaptiveTTL, $maxTTL );
1965
1966                 $this->lowerCdnMaxage( (int)$adaptiveTTL );
1967
1968                 return $adaptiveTTL;
1969         }
1970
1971         /**
1972          * Use enableClientCache(false) to force it to send nocache headers
1973          *
1974          * @param bool $state
1975          *
1976          * @return bool
1977          */
1978         public function enableClientCache( $state ) {
1979                 return wfSetVar( $this->mEnableClientCache, $state );
1980         }
1981
1982         /**
1983          * Get the list of cookies that will influence on the cache
1984          *
1985          * @return array
1986          */
1987         function getCacheVaryCookies() {
1988                 static $cookies;
1989                 if ( $cookies === null ) {
1990                         $config = $this->getConfig();
1991                         $cookies = array_merge(
1992                                 SessionManager::singleton()->getVaryCookies(),
1993                                 [
1994                                         'forceHTTPS',
1995                                 ],
1996                                 $config->get( 'CacheVaryCookies' )
1997                         );
1998                         Hooks::run( 'GetCacheVaryCookies', [ $this, &$cookies ] );
1999                 }
2000                 return $cookies;
2001         }
2002
2003         /**
2004          * Check if the request has a cache-varying cookie header
2005          * If it does, it's very important that we don't allow public caching
2006          *
2007          * @return bool
2008          */
2009         function haveCacheVaryCookies() {
2010                 $request = $this->getRequest();
2011                 foreach ( $this->getCacheVaryCookies() as $cookieName ) {
2012                         if ( $request->getCookie( $cookieName, '', '' ) !== '' ) {
2013                                 wfDebug( __METHOD__ . ": found $cookieName\n" );
2014                                 return true;
2015                         }
2016                 }
2017                 wfDebug( __METHOD__ . ": no cache-varying cookies found\n" );
2018                 return false;
2019         }
2020
2021         /**
2022          * Add an HTTP header that will influence on the cache
2023          *
2024          * @param string $header Header name
2025          * @param string[]|null $option Options for the Key header. See
2026          * https://datatracker.ietf.org/doc/draft-fielding-http-key/
2027          * for the list of valid options.
2028          */
2029         public function addVaryHeader( $header, array $option = null ) {
2030                 if ( !array_key_exists( $header, $this->mVaryHeader ) ) {
2031                         $this->mVaryHeader[$header] = [];
2032                 }
2033                 if ( !is_array( $option ) ) {
2034                         $option = [];
2035                 }
2036                 $this->mVaryHeader[$header] = array_unique( array_merge( $this->mVaryHeader[$header], $option ) );
2037         }
2038
2039         /**
2040          * Return a Vary: header on which to vary caches. Based on the keys of $mVaryHeader,
2041          * such as Accept-Encoding or Cookie
2042          *
2043          * @return string
2044          */
2045         public function getVaryHeader() {
2046                 // If we vary on cookies, let's make sure it's always included here too.
2047                 if ( $this->getCacheVaryCookies() ) {
2048                         $this->addVaryHeader( 'Cookie' );
2049                 }
2050
2051                 foreach ( SessionManager::singleton()->getVaryHeaders() as $header => $options ) {
2052                         $this->addVaryHeader( $header, $options );
2053                 }
2054                 return 'Vary: ' . implode( ', ', array_keys( $this->mVaryHeader ) );
2055         }
2056
2057         /**
2058          * Get a complete Key header
2059          *
2060          * @return string
2061          */
2062         public function getKeyHeader() {
2063                 $cvCookies = $this->getCacheVaryCookies();
2064
2065                 $cookiesOption = [];
2066                 foreach ( $cvCookies as $cookieName ) {
2067                         $cookiesOption[] = 'param=' . $cookieName;
2068                 }
2069                 $this->addVaryHeader( 'Cookie', $cookiesOption );
2070
2071                 foreach ( SessionManager::singleton()->getVaryHeaders() as $header => $options ) {
2072                         $this->addVaryHeader( $header, $options );
2073                 }
2074
2075                 $headers = [];
2076                 foreach ( $this->mVaryHeader as $header => $option ) {
2077                         $newheader = $header;
2078                         if ( is_array( $option ) && count( $option ) > 0 ) {
2079                                 $newheader .= ';' . implode( ';', $option );
2080                         }
2081                         $headers[] = $newheader;
2082                 }
2083                 $key = 'Key: ' . implode( ',', $headers );
2084
2085                 return $key;
2086         }
2087
2088         /**
2089          * T23672: Add Accept-Language to Vary and Key headers
2090          * if there's no 'variant' parameter existed in GET.
2091          *
2092          * For example:
2093          *   /w/index.php?title=Main_page should always be served; but
2094          *   /w/index.php?title=Main_page&variant=zh-cn should never be served.
2095          */
2096         function addAcceptLanguage() {
2097                 $title = $this->getTitle();
2098                 if ( !$title instanceof Title ) {
2099                         return;
2100                 }
2101
2102                 $lang = $title->getPageLanguage();
2103                 if ( !$this->getRequest()->getCheck( 'variant' ) && $lang->hasVariants() ) {
2104                         $variants = $lang->getVariants();
2105                         $aloption = [];
2106                         foreach ( $variants as $variant ) {
2107                                 if ( $variant === $lang->getCode() ) {
2108                                         continue;
2109                                 } else {
2110                                         $aloption[] = 'substr=' . $variant;
2111
2112                                         // IE and some other browsers use BCP 47 standards in
2113                                         // their Accept-Language header, like "zh-CN" or "zh-Hant".
2114                                         // We should handle these too.
2115                                         $variantBCP47 = wfBCP47( $variant );
2116                                         if ( $variantBCP47 !== $variant ) {
2117                                                 $aloption[] = 'substr=' . $variantBCP47;
2118                                         }
2119                                 }
2120                         }
2121                         $this->addVaryHeader( 'Accept-Language', $aloption );
2122                 }
2123         }
2124
2125         /**
2126          * Set a flag which will cause an X-Frame-Options header appropriate for
2127          * edit pages to be sent. The header value is controlled by
2128          * $wgEditPageFrameOptions.
2129          *
2130          * This is the default for special pages. If you display a CSRF-protected
2131          * form on an ordinary view page, then you need to call this function.
2132          *
2133          * @param bool $enable
2134          */
2135         public function preventClickjacking( $enable = true ) {
2136                 $this->mPreventClickjacking = $enable;
2137         }
2138
2139         /**
2140          * Turn off frame-breaking. Alias for $this->preventClickjacking(false).
2141          * This can be called from pages which do not contain any CSRF-protected
2142          * HTML form.
2143          */
2144         public function allowClickjacking() {
2145                 $this->mPreventClickjacking = false;
2146         }
2147
2148         /**
2149          * Get the prevent-clickjacking flag
2150          *
2151          * @since 1.24
2152          * @return bool
2153          */
2154         public function getPreventClickjacking() {
2155                 return $this->mPreventClickjacking;
2156         }
2157
2158         /**
2159          * Get the X-Frame-Options header value (without the name part), or false
2160          * if there isn't one. This is used by Skin to determine whether to enable
2161          * JavaScript frame-breaking, for clients that don't support X-Frame-Options.
2162          *
2163          * @return string
2164          */
2165         public function getFrameOptions() {
2166                 $config = $this->getConfig();
2167                 if ( $config->get( 'BreakFrames' ) ) {
2168                         return 'DENY';
2169                 } elseif ( $this->mPreventClickjacking && $config->get( 'EditPageFrameOptions' ) ) {
2170                         return $config->get( 'EditPageFrameOptions' );
2171                 }
2172                 return false;
2173         }
2174
2175         /**
2176          * Send cache control HTTP headers
2177          */
2178         public function sendCacheControl() {
2179                 $response = $this->getRequest()->response();
2180                 $config = $this->getConfig();
2181
2182                 $this->addVaryHeader( 'Cookie' );
2183                 $this->addAcceptLanguage();
2184
2185                 # don't serve compressed data to clients who can't handle it
2186                 # maintain different caches for logged-in users and non-logged in ones
2187                 $response->header( $this->getVaryHeader() );
2188
2189                 if ( $config->get( 'UseKeyHeader' ) ) {
2190                         $response->header( $this->getKeyHeader() );
2191                 }
2192
2193                 if ( $this->mEnableClientCache ) {
2194                         if (
2195                                 $config->get( 'UseSquid' ) &&
2196                                 !$response->hasCookies() &&
2197                                 !SessionManager::getGlobalSession()->isPersistent() &&
2198                                 !$this->isPrintable() &&
2199                                 $this->mCdnMaxage != 0 &&
2200                                 !$this->haveCacheVaryCookies()
2201                         ) {
2202                                 if ( $config->get( 'UseESI' ) ) {
2203                                         # We'll purge the proxy cache explicitly, but require end user agents
2204                                         # to revalidate against the proxy on each visit.
2205                                         # Surrogate-Control controls our CDN, Cache-Control downstream caches
2206                                         wfDebug( __METHOD__ . ": proxy caching with ESI; {$this->mLastModified} **", 'private' );
2207                                         # start with a shorter timeout for initial testing
2208                                         # header( 'Surrogate-Control: max-age=2678400+2678400, content="ESI/1.0"');
2209                                         $response->header( 'Surrogate-Control: max-age=' . $config->get( 'SquidMaxage' )
2210                                                 . '+' . $this->mCdnMaxage . ', content="ESI/1.0"' );
2211                                         $response->header( 'Cache-Control: s-maxage=0, must-revalidate, max-age=0' );
2212                                 } else {
2213                                         # We'll purge the proxy cache for anons explicitly, but require end user agents
2214                                         # to revalidate against the proxy on each visit.
2215                                         # IMPORTANT! The CDN needs to replace the Cache-Control header with
2216                                         # Cache-Control: s-maxage=0, must-revalidate, max-age=0
2217                                         wfDebug( __METHOD__ . ": local proxy caching; {$this->mLastModified} **", 'private' );
2218                                         # start with a shorter timeout for initial testing
2219                                         # header( "Cache-Control: s-maxage=2678400, must-revalidate, max-age=0" );
2220                                         $response->header( 'Cache-Control: s-maxage=' . $this->mCdnMaxage
2221                                                 . ', must-revalidate, max-age=0' );
2222                                 }
2223                         } else {
2224                                 # We do want clients to cache if they can, but they *must* check for updates
2225                                 # on revisiting the page.
2226                                 wfDebug( __METHOD__ . ": private caching; {$this->mLastModified} **", 'private' );
2227                                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
2228                                 $response->header( "Cache-Control: private, must-revalidate, max-age=0" );
2229                         }
2230                         if ( $this->mLastModified ) {
2231                                 $response->header( "Last-Modified: {$this->mLastModified}" );
2232                         }
2233                 } else {
2234                         wfDebug( __METHOD__ . ": no caching **", 'private' );
2235
2236                         # In general, the absence of a last modified header should be enough to prevent
2237                         # the client from using its cache. We send a few other things just to make sure.
2238                         $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
2239                         $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
2240                         $response->header( 'Pragma: no-cache' );
2241                 }
2242         }
2243
2244         /**
2245          * Finally, all the text has been munged and accumulated into
2246          * the object, let's actually output it:
2247          */
2248         public function output() {
2249                 if ( $this->mDoNothing ) {
2250                         return;
2251                 }
2252
2253                 $response = $this->getRequest()->response();
2254                 $config = $this->getConfig();
2255
2256                 if ( $this->mRedirect != '' ) {
2257                         # Standards require redirect URLs to be absolute
2258                         $this->mRedirect = wfExpandUrl( $this->mRedirect, PROTO_CURRENT );
2259
2260                         $redirect = $this->mRedirect;
2261                         $code = $this->mRedirectCode;
2262
2263                         if ( Hooks::run( "BeforePageRedirect", [ $this, &$redirect, &$code ] ) ) {
2264                                 if ( $code == '301' || $code == '303' ) {
2265                                         if ( !$config->get( 'DebugRedirects' ) ) {
2266                                                 $response->statusHeader( $code );
2267                                         }
2268                                         $this->mLastModified = wfTimestamp( TS_RFC2822 );
2269                                 }
2270                                 if ( $config->get( 'VaryOnXFP' ) ) {
2271                                         $this->addVaryHeader( 'X-Forwarded-Proto' );
2272                                 }
2273                                 $this->sendCacheControl();
2274
2275                                 $response->header( "Content-Type: text/html; charset=utf-8" );
2276                                 if ( $config->get( 'DebugRedirects' ) ) {
2277                                         $url = htmlspecialchars( $redirect );
2278                                         print "<html>\n<head>\n<title>Redirect</title>\n</head>\n<body>\n";
2279                                         print "<p>Location: <a href=\"$url\">$url</a></p>\n";
2280                                         print "</body>\n</html>\n";
2281                                 } else {
2282                                         $response->header( 'Location: ' . $redirect );
2283                                 }
2284                         }
2285
2286                         return;
2287                 } elseif ( $this->mStatusCode ) {
2288                         $response->statusHeader( $this->mStatusCode );
2289                 }
2290
2291                 # Buffer output; final headers may depend on later processing
2292                 ob_start();
2293
2294                 $response->header( 'Content-type: ' . $config->get( 'MimeType' ) . '; charset=UTF-8' );
2295                 $response->header( 'Content-language: ' . $config->get( 'LanguageCode' ) );
2296
2297                 // Avoid Internet Explorer "compatibility view" in IE 8-10, so that
2298                 // jQuery etc. can work correctly.
2299                 $response->header( 'X-UA-Compatible: IE=Edge' );
2300
2301                 // Prevent framing, if requested
2302                 $frameOptions = $this->getFrameOptions();
2303                 if ( $frameOptions ) {
2304                         $response->header( "X-Frame-Options: $frameOptions" );
2305                 }
2306
2307                 if ( $this->mArticleBodyOnly ) {
2308                         echo $this->mBodytext;
2309                 } else {
2310                         $sk = $this->getSkin();
2311                         // add skin specific modules
2312                         $modules = $sk->getDefaultModules();
2313
2314                         // Enforce various default modules for all pages and all skins
2315                         $coreModules = [
2316                                 // Keep this list as small as possible
2317                                 'site',
2318                                 'mediawiki.page.startup',
2319                                 'mediawiki.user',
2320                         ];
2321
2322                         // Support for high-density display images if enabled
2323                         if ( $config->get( 'ResponsiveImages' ) ) {
2324                                 $coreModules[] = 'mediawiki.hidpi';
2325                         }
2326
2327                         $this->addModules( $coreModules );
2328                         foreach ( $modules as $group ) {
2329                                 $this->addModules( $group );
2330                         }
2331                         MWDebug::addModules( $this );
2332
2333                         // Hook that allows last minute changes to the output page, e.g.
2334                         // adding of CSS or Javascript by extensions.
2335                         Hooks::run( 'BeforePageDisplay', [ &$this, &$sk ] );
2336                         $this->getSkin()->setupSkinUserCss( $this );
2337
2338                         try {
2339                                 $sk->outputPage();
2340                         } catch ( Exception $e ) {
2341                                 ob_end_clean(); // bug T129657
2342                                 throw $e;
2343                         }
2344                 }
2345
2346                 try {
2347                         // This hook allows last minute changes to final overall output by modifying output buffer
2348                         Hooks::run( 'AfterFinalPageOutput', [ $this ] );
2349                 } catch ( Exception $e ) {
2350                         ob_end_clean(); // bug T129657
2351                         throw $e;
2352                 }
2353
2354                 $this->sendCacheControl();
2355
2356                 ob_end_flush();
2357
2358         }
2359
2360         /**
2361          * Prepare this object to display an error page; disable caching and
2362          * indexing, clear the current text and redirect, set the page's title
2363          * and optionally an custom HTML title (content of the "<title>" tag).
2364          *
2365          * @param string|Message $pageTitle Will be passed directly to setPageTitle()
2366          * @param string|Message $htmlTitle Will be passed directly to setHTMLTitle();
2367          *                   optional, if not passed the "<title>" attribute will be
2368          *                   based on $pageTitle
2369          */
2370         public function prepareErrorPage( $pageTitle, $htmlTitle = false ) {
2371                 $this->setPageTitle( $pageTitle );
2372                 if ( $htmlTitle !== false ) {
2373                         $this->setHTMLTitle( $htmlTitle );
2374                 }
2375                 $this->setRobotPolicy( 'noindex,nofollow' );
2376                 $this->setArticleRelated( false );
2377                 $this->enableClientCache( false );
2378                 $this->mRedirect = '';
2379                 $this->clearSubtitle();
2380                 $this->clearHTML();
2381         }
2382
2383         /**
2384          * Output a standard error page
2385          *
2386          * showErrorPage( 'titlemsg', 'pagetextmsg' );
2387          * showErrorPage( 'titlemsg', 'pagetextmsg', array( 'param1', 'param2' ) );
2388          * showErrorPage( 'titlemsg', $messageObject );
2389          * showErrorPage( $titleMessageObject, $messageObject );
2390          *
2391          * @param string|Message $title Message key (string) for page title, or a Message object
2392          * @param string|Message $msg Message key (string) for page text, or a Message object
2393          * @param array $params Message parameters; ignored if $msg is a Message object
2394          */
2395         public function showErrorPage( $title, $msg, $params = [] ) {
2396                 if ( !$title instanceof Message ) {
2397                         $title = $this->msg( $title );
2398                 }
2399
2400                 $this->prepareErrorPage( $title );
2401
2402                 if ( $msg instanceof Message ) {
2403                         if ( $params !== [] ) {
2404                                 trigger_error( 'Argument ignored: $params. The message parameters argument '
2405                                         . 'is discarded when the $msg argument is a Message object instead of '
2406                                         . 'a string.', E_USER_NOTICE );
2407                         }
2408                         $this->addHTML( $msg->parseAsBlock() );
2409                 } else {
2410                         $this->addWikiMsgArray( $msg, $params );
2411                 }
2412
2413                 $this->returnToMain();
2414         }
2415
2416         /**
2417          * Output a standard permission error page
2418          *
2419          * @param array $errors Error message keys
2420          * @param string $action Action that was denied or null if unknown
2421          */
2422         public function showPermissionsErrorPage( array $errors, $action = null ) {
2423                 // For some action (read, edit, create and upload), display a "login to do this action"
2424                 // error if all of the following conditions are met:
2425                 // 1. the user is not logged in
2426                 // 2. the only error is insufficient permissions (i.e. no block or something else)
2427                 // 3. the error can be avoided simply by logging in
2428                 if ( in_array( $action, [ 'read', 'edit', 'createpage', 'createtalk', 'upload' ] )
2429                         && $this->getUser()->isAnon() && count( $errors ) == 1 && isset( $errors[0][0] )
2430                         && ( $errors[0][0] == 'badaccess-groups' || $errors[0][0] == 'badaccess-group0' )
2431                         && ( User::groupHasPermission( 'user', $action )
2432                         || User::groupHasPermission( 'autoconfirmed', $action ) )
2433                 ) {
2434                         $displayReturnto = null;
2435
2436                         # Due to bug 32276, if a user does not have read permissions,
2437                         # $this->getTitle() will just give Special:Badtitle, which is
2438                         # not especially useful as a returnto parameter. Use the title
2439                         # from the request instead, if there was one.
2440                         $request = $this->getRequest();
2441                         $returnto = Title::newFromText( $request->getVal( 'title', '' ) );
2442                         if ( $action == 'edit' ) {
2443                                 $msg = 'whitelistedittext';
2444                                 $displayReturnto = $returnto;
2445                         } elseif ( $action == 'createpage' || $action == 'createtalk' ) {
2446                                 $msg = 'nocreatetext';
2447                         } elseif ( $action == 'upload' ) {
2448                                 $msg = 'uploadnologintext';
2449                         } else { # Read
2450                                 $msg = 'loginreqpagetext';
2451                                 $displayReturnto = Title::newMainPage();
2452                         }
2453
2454                         $query = [];
2455
2456                         if ( $returnto ) {
2457                                 $query['returnto'] = $returnto->getPrefixedText();
2458
2459                                 if ( !$request->wasPosted() ) {
2460                                         $returntoquery = $request->getValues();
2461                                         unset( $returntoquery['title'] );
2462                                         unset( $returntoquery['returnto'] );
2463                                         unset( $returntoquery['returntoquery'] );
2464                                         $query['returntoquery'] = wfArrayToCgi( $returntoquery );
2465                                 }
2466                         }
2467                         $loginLink = Linker::linkKnown(
2468                                 SpecialPage::getTitleFor( 'Userlogin' ),
2469                                 $this->msg( 'loginreqlink' )->escaped(),
2470                                 [],
2471                                 $query
2472                         );
2473
2474                         $this->prepareErrorPage( $this->msg( 'loginreqtitle' ) );
2475                         $this->addHTML( $this->msg( $msg )->rawParams( $loginLink )->parse() );
2476
2477                         # Don't return to a page the user can't read otherwise
2478                         # we'll end up in a pointless loop
2479                         if ( $displayReturnto && $displayReturnto->userCan( 'read', $this->getUser() ) ) {
2480                                 $this->returnToMain( null, $displayReturnto );
2481                         }
2482                 } else {
2483                         $this->prepareErrorPage( $this->msg( 'permissionserrors' ) );
2484                         $this->addWikiText( $this->formatPermissionsErrorMessage( $errors, $action ) );
2485                 }
2486         }
2487
2488         /**
2489          * Display an error page indicating that a given version of MediaWiki is
2490          * required to use it
2491          *
2492          * @param mixed $version The version of MediaWiki needed to use the page
2493          */
2494         public function versionRequired( $version ) {
2495                 $this->prepareErrorPage( $this->msg( 'versionrequired', $version ) );
2496
2497                 $this->addWikiMsg( 'versionrequiredtext', $version );
2498                 $this->returnToMain();
2499         }
2500
2501         /**
2502          * Format a list of error messages
2503          *
2504          * @param array $errors Array of arrays returned by Title::getUserPermissionsErrors
2505          * @param string $action Action that was denied or null if unknown
2506          * @return string The wikitext error-messages, formatted into a list.
2507          */
2508         public function formatPermissionsErrorMessage( array $errors, $action = null ) {
2509                 if ( $action == null ) {
2510                         $text = $this->msg( 'permissionserrorstext', count( $errors ) )->plain() . "\n\n";
2511                 } else {
2512                         $action_desc = $this->msg( "action-$action" )->plain();
2513                         $text = $this->msg(
2514                                 'permissionserrorstext-withaction',
2515                                 count( $errors ),
2516                                 $action_desc
2517                         )->plain() . "\n\n";
2518                 }
2519
2520                 if ( count( $errors ) > 1 ) {
2521                         $text .= '<ul class="permissions-errors">' . "\n";
2522
2523                         foreach ( $errors as $error ) {
2524                                 $text .= '<li>';
2525                                 $text .= call_user_func_array( [ $this, 'msg' ], $error )->plain();
2526                                 $text .= "</li>\n";
2527                         }
2528                         $text .= '</ul>';
2529                 } else {
2530                         $text .= "<div class=\"permissions-errors\">\n" .
2531                                         call_user_func_array( [ $this, 'msg' ], reset( $errors ) )->plain() .
2532                                         "\n</div>";
2533                 }
2534
2535                 return $text;
2536         }
2537
2538         /**
2539          * Display a page stating that the Wiki is in read-only mode.
2540          * Should only be called after wfReadOnly() has returned true.
2541          *
2542          * Historically, this function was used to show the source of the page that the user
2543          * was trying to edit and _also_ permissions error messages. The relevant code was
2544          * moved into EditPage in 1.19 (r102024 / d83c2a431c2a) and removed here in 1.25.
2545          *
2546          * @deprecated since 1.25; throw the exception directly
2547          * @throws ReadOnlyError
2548          */
2549         public function readOnlyPage() {
2550                 if ( func_num_args() > 0 ) {
2551                         throw new MWException( __METHOD__ . ' no longer accepts arguments since 1.25.' );
2552                 }
2553
2554                 throw new ReadOnlyError;
2555         }
2556
2557         /**
2558          * Turn off regular page output and return an error response
2559          * for when rate limiting has triggered.
2560          *
2561          * @deprecated since 1.25; throw the exception directly
2562          */
2563         public function rateLimited() {
2564                 wfDeprecated( __METHOD__, '1.25' );
2565                 throw new ThrottledError;
2566         }
2567
2568         /**
2569          * Show a warning about slave lag
2570          *
2571          * If the lag is higher than $wgSlaveLagCritical seconds,
2572          * then the warning is a bit more obvious. If the lag is
2573          * lower than $wgSlaveLagWarning, then no warning is shown.
2574          *
2575          * @param int $lag Slave lag
2576          */
2577         public function showLagWarning( $lag ) {
2578                 $config = $this->getConfig();
2579                 if ( $lag >= $config->get( 'SlaveLagWarning' ) ) {
2580                         $message = $lag < $config->get( 'SlaveLagCritical' )
2581                                 ? 'lag-warn-normal'
2582                                 : 'lag-warn-high';
2583                         $wrap = Html::rawElement( 'div', [ 'class' => "mw-{$message}" ], "\n$1\n" );
2584                         $this->wrapWikiMsg( "$wrap\n", [ $message, $this->getLanguage()->formatNum( $lag ) ] );
2585                 }
2586         }
2587
2588         public function showFatalError( $message ) {
2589                 $this->prepareErrorPage( $this->msg( 'internalerror' ) );
2590
2591                 $this->addHTML( $message );
2592         }
2593
2594         public function showUnexpectedValueError( $name, $val ) {
2595                 $this->showFatalError( $this->msg( 'unexpected', $name, $val )->text() );
2596         }
2597
2598         public function showFileCopyError( $old, $new ) {
2599                 $this->showFatalError( $this->msg( 'filecopyerror', $old, $new )->text() );
2600         }
2601
2602         public function showFileRenameError( $old, $new ) {
2603                 $this->showFatalError( $this->msg( 'filerenameerror', $old, $new )->text() );
2604         }
2605
2606         public function showFileDeleteError( $name ) {
2607                 $this->showFatalError( $this->msg( 'filedeleteerror', $name )->text() );
2608         }
2609
2610         public function showFileNotFoundError( $name ) {
2611                 $this->showFatalError( $this->msg( 'filenotfound', $name )->text() );
2612         }
2613
2614         /**
2615          * Add a "return to" link pointing to a specified title
2616          *
2617          * @param Title $title Title to link
2618          * @param array $query Query string parameters
2619          * @param string $text Text of the link (input is not escaped)
2620          * @param array $options Options array to pass to Linker
2621          */
2622         public function addReturnTo( $title, array $query = [], $text = null, $options = [] ) {
2623                 $link = $this->msg( 'returnto' )->rawParams(
2624                         Linker::link( $title, $text, [], $query, $options ) )->escaped();
2625                 $this->addHTML( "<p id=\"mw-returnto\">{$link}</p>\n" );
2626         }
2627
2628         /**
2629          * Add a "return to" link pointing to a specified title,
2630          * or the title indicated in the request, or else the main page
2631          *
2632          * @param mixed $unused
2633          * @param Title|string $returnto Title or String to return to
2634          * @param string $returntoquery Query string for the return to link
2635          */
2636         public function returnToMain( $unused = null, $returnto = null, $returntoquery = null ) {
2637                 if ( $returnto == null ) {
2638                         $returnto = $this->getRequest()->getText( 'returnto' );
2639                 }
2640
2641                 if ( $returntoquery == null ) {
2642                         $returntoquery = $this->getRequest()->getText( 'returntoquery' );
2643                 }
2644
2645                 if ( $returnto === '' ) {
2646                         $returnto = Title::newMainPage();
2647                 }
2648
2649                 if ( is_object( $returnto ) ) {
2650                         $titleObj = $returnto;
2651                 } else {
2652                         $titleObj = Title::newFromText( $returnto );
2653                 }
2654                 if ( !is_object( $titleObj ) ) {
2655                         $titleObj = Title::newMainPage();
2656                 }
2657
2658                 $this->addReturnTo( $titleObj, wfCgiToArray( $returntoquery ) );
2659         }
2660
2661         private function getRlClientContext() {
2662                 if ( !$this->rlClientContext ) {
2663                         $query = ResourceLoader::makeLoaderQuery(
2664                                 [], // modules; not relevant
2665                                 $this->getLanguage()->getCode(),
2666                                 $this->getSkin()->getSkinName(),
2667                                 $this->getUser()->isLoggedIn() ? $this->getUser()->getName() : null,
2668                                 null, // version; not relevant
2669                                 ResourceLoader::inDebugMode(),
2670                                 null, // only; not relevant
2671                                 $this->isPrintable(),
2672                                 $this->getRequest()->getBool( 'handheld' )
2673                         );
2674                         $this->rlClientContext = new ResourceLoaderContext(
2675                                 $this->getResourceLoader(),
2676                                 new FauxRequest( $query )
2677                         );
2678                 }
2679                 return $this->rlClientContext;
2680         }
2681
2682         /**
2683          * Call this to freeze the module queue and JS config and create a formatter.
2684          *
2685          * Depending on the Skin, this may get lazy-initialised in either headElement() or
2686          * getBottomScripts(). See SkinTemplate::prepareQuickTemplate(). Calling this too early may
2687          * cause unexpected side-effects since disallowUserJs() may be called at any time to change
2688          * the module filters retroactively. Skins and extension hooks may also add modules until very
2689          * late in the request lifecycle.
2690          *
2691          * @return ResourceLoaderClientHtml
2692          */
2693         public function getRlClient() {
2694                 if ( !$this->rlClient ) {
2695                         $context = $this->getRlClientContext();
2696                         $rl = $this->getResourceLoader();
2697                         $this->addModules( [
2698                                 'user.options',
2699                                 'user.tokens',
2700                         ] );
2701                         $this->addModuleStyles( [
2702                                 'site.styles',
2703                                 'noscript',
2704                                 'user.styles',
2705                                 'user.cssprefs',
2706                         ] );
2707
2708                         // Prepare exempt modules for buildExemptModules()
2709                         $exemptGroups = [ 'site' => [], 'noscript' => [], 'private' => [], 'user' => [] ];
2710                         $exemptStates = [];
2711                         $moduleStyles = array_filter( $this->getModuleStyles( /*filter*/ true ),
2712                                 function ( $name ) use ( $rl, $context, &$exemptGroups, &$exemptStates ) {
2713                                         $module = $rl->getModule( $name );
2714                                         if ( $module ) {
2715                                                 $group = $module->getGroup();
2716                                                 if ( $name === 'user.styles' && $this->isUserCssPreview() ) {
2717                                                         $exemptStates[$name] = 'ready';
2718                                                         // Special case in buildExemptModules()
2719                                                         return false;
2720                                                 }
2721                                                 if ( $name === 'site.styles' ) {
2722                                                         // HACK: Technically, 'site.styles' isn't in a separate request group.
2723                                                         // But, in order to ensure its styles are in the right position,
2724                                                         // pretend it's in a group called 'site'.
2725                                                         $group = 'site';
2726                                                 }
2727                                                 if ( isset( $exemptGroups[$group] ) ) {
2728                                                         $exemptStates[$name] = 'ready';
2729                                                         if ( !$module->isKnownEmpty( $context ) ) {
2730                                                                 // E.g. Don't output empty <styles>
2731                                                                 $exemptGroups[$group][] = $name;
2732                                                         }
2733                                                         return false;
2734                                                 }
2735                                         }
2736                                         return true;
2737                                 }
2738                         );
2739                         $this->rlExemptStyleModules = $exemptGroups;
2740
2741                         // Manually handled by getBottomScripts()
2742                         $userModule = $rl->getModule( 'user' );
2743                         $userState = $userModule->isKnownEmpty( $context ) && !$this->isUserJsPreview()
2744                                 ? 'ready'
2745                                 : 'loading';
2746                         $this->rlUserModuleState = $exemptStates['user'] = $userState;
2747
2748                         $rlClient = new ResourceLoaderClientHtml( $context, $this->getTarget() );
2749                         $rlClient->setConfig( $this->getJSVars() );
2750                         $rlClient->setModules( $this->getModules( /*filter*/ true ) );
2751                         $rlClient->setModuleStyles( $moduleStyles );
2752                         $rlClient->setModuleScripts( $this->getModuleScripts( /*filter*/ true ) );
2753                         $rlClient->setExemptStates( $exemptStates );
2754                         $this->rlClient = $rlClient;
2755                 }
2756                 return $this->rlClient;
2757         }
2758
2759         /**
2760          * @param Skin $sk The given Skin
2761          * @param bool $includeStyle Unused
2762          * @return string The doctype, opening "<html>", and head element.
2763          */
2764         public function headElement( Skin $sk, $includeStyle = true ) {
2765                 global $wgContLang;
2766
2767                 $userdir = $this->getLanguage()->getDir();
2768                 $sitedir = $wgContLang->getDir();
2769
2770                 $pieces = [];
2771                 $pieces[] = Html::htmlHeader( Sanitizer::mergeAttributes(
2772                         $this->getRlClient()->getDocumentAttributes(),
2773                         $sk->getHtmlElementAttributes()
2774                 ) );
2775                 $pieces[] = Html::openElement( 'head' );
2776
2777                 if ( $this->getHTMLTitle() == '' ) {
2778                         $this->setHTMLTitle( $this->msg( 'pagetitle', $this->getPageTitle() )->inContentLanguage() );
2779                 }
2780
2781                 if ( !Html::isXmlMimeType( $this->getConfig()->get( 'MimeType' ) ) ) {
2782                         // Add <meta charset="UTF-8">
2783                         // This should be before <title> since it defines the charset used by
2784                         // text including the text inside <title>.
2785                         // The spec recommends defining XHTML5's charset using the XML declaration
2786                         // instead of meta.
2787                         // Our XML declaration is output by Html::htmlHeader.
2788                         // http://www.whatwg.org/html/semantics.html#attr-meta-http-equiv-content-type
2789                         // http://www.whatwg.org/html/semantics.html#charset
2790                         $pieces[] = Html::element( 'meta', [ 'charset' => 'UTF-8' ] );
2791                 }
2792
2793                 $pieces[] = Html::element( 'title', null, $this->getHTMLTitle() );
2794                 $pieces[] = $this->getRlClient()->getHeadHtml();
2795                 $pieces[] = $this->buildExemptModules();
2796                 $pieces = array_merge( $pieces, array_values( $this->getHeadLinksArray() ) );
2797                 $pieces = array_merge( $pieces, array_values( $this->mHeadItems ) );
2798                 $pieces[] = Html::closeElement( 'head' );
2799
2800                 $bodyClasses = [];
2801                 $bodyClasses[] = 'mediawiki';
2802
2803                 # Classes for LTR/RTL directionality support
2804                 $bodyClasses[] = $userdir;
2805                 $bodyClasses[] = "sitedir-$sitedir";
2806
2807                 if ( $this->getLanguage()->capitalizeAllNouns() ) {
2808                         # A <body> class is probably not the best way to do this . . .
2809                         $bodyClasses[] = 'capitalize-all-nouns';
2810                 }
2811
2812                 // Parser feature migration class
2813                 // The idea is that this will eventually be removed, after the wikitext
2814                 // which requires it is cleaned up.
2815                 $bodyClasses[] = 'mw-hide-empty-elt';
2816
2817                 $bodyClasses[] = $sk->getPageClasses( $this->getTitle() );
2818                 $bodyClasses[] = 'skin-' . Sanitizer::escapeClass( $sk->getSkinName() );
2819                 $bodyClasses[] =
2820                         'action-' . Sanitizer::escapeClass( Action::getActionName( $this->getContext() ) );
2821
2822                 $bodyAttrs = [];
2823                 // While the implode() is not strictly needed, it's used for backwards compatibility
2824                 // (this used to be built as a string and hooks likely still expect that).
2825                 $bodyAttrs['class'] = implode( ' ', $bodyClasses );
2826
2827                 // Allow skins and extensions to add body attributes they need
2828                 $sk->addToBodyAttributes( $this, $bodyAttrs );
2829                 Hooks::run( 'OutputPageBodyAttributes', [ $this, $sk, &$bodyAttrs ] );
2830
2831                 $pieces[] = Html::openElement( 'body', $bodyAttrs );
2832
2833                 return self::combineWrappedStrings( $pieces );
2834         }
2835
2836         /**
2837          * Get a ResourceLoader object associated with this OutputPage
2838          *
2839          * @return ResourceLoader
2840          */
2841         public function getResourceLoader() {
2842                 if ( is_null( $this->mResourceLoader ) ) {
2843                         $this->mResourceLoader = new ResourceLoader(
2844                                 $this->getConfig(),
2845                                 LoggerFactory::getInstance( 'resourceloader' )
2846                         );
2847                 }
2848                 return $this->mResourceLoader;
2849         }
2850
2851         /**
2852          * Explicily load or embed modules on a page.
2853          *
2854          * @param array|string $modules One or more module names
2855          * @param string $only ResourceLoaderModule TYPE_ class constant
2856          * @param array $extraQuery [optional] Array with extra query parameters for the request
2857          * @return string|WrappedStringList HTML
2858          */
2859         public function makeResourceLoaderLink( $modules, $only, array $extraQuery = [] ) {
2860                 // Apply 'target' and 'origin' filters
2861                 $modules = $this->filterModules( (array)$modules, null, $only );
2862
2863                 return ResourceLoaderClientHtml::makeLoad(
2864                         $this->getRlClientContext(),
2865                         $modules,
2866                         $only,
2867                         $extraQuery
2868                 );
2869         }
2870
2871         /**
2872          * Combine WrappedString chunks and filter out empty ones
2873          *
2874          * @param array $chunks
2875          * @return string|WrappedStringList HTML
2876          */
2877         protected static function combineWrappedStrings( array $chunks ) {
2878                 // Filter out empty values
2879                 $chunks = array_filter( $chunks, 'strlen' );
2880                 return WrappedString::join( "\n", $chunks );
2881         }
2882
2883         private function isUserJsPreview() {
2884                 return $this->getConfig()->get( 'AllowUserJs' )
2885                         && $this->getTitle()
2886                         && $this->getTitle()->isJsSubpage()
2887                         && $this->userCanPreview();
2888         }
2889
2890         private function isUserCssPreview() {
2891                 return $this->getConfig()->get( 'AllowUserCss' )
2892                         && $this->getTitle()
2893                         && $this->getTitle()->isCssSubpage()
2894                         && $this->userCanPreview();
2895         }
2896
2897         /**
2898          * JS stuff to put at the bottom of the `<body>`. These are modules with position 'bottom',
2899          * legacy scripts ($this->mScripts), and user JS.
2900          *
2901          * @return string|WrappedStringList HTML
2902          */
2903         public function getBottomScripts() {
2904                 $chunks = [];
2905                 $chunks[] = $this->getRlClient()->getBodyHtml();
2906
2907                 // Legacy non-ResourceLoader scripts
2908                 $chunks[] = $this->mScripts;
2909
2910                 // Exempt 'user' module
2911                 // - May need excludepages for live preview. (T28283)
2912                 // - Must use TYPE_COMBINED so its response is handled by mw.loader.implement() which
2913                 //   ensures execution is scheduled after the "site" module.
2914                 // - Don't load if module state is already resolved as "ready".
2915                 if ( $this->rlUserModuleState === 'loading' ) {
2916                         if ( $this->isUserJsPreview() ) {
2917                                 $chunks[] = $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_COMBINED,
2918                                         [ 'excludepage' => $this->getTitle()->getPrefixedDBkey() ]
2919                                 );
2920                                 $chunks[] = ResourceLoader::makeInlineScript(
2921                                         Xml::encodeJsCall( 'mw.loader.using', [
2922                                                 [ 'user', 'site' ],
2923                                                 new XmlJsCode(
2924                                                         'function () {'
2925                                                                 . Xml::encodeJsCall( '$.globalEval', [
2926                                                                         $this->getRequest()->getText( 'wpTextbox1' )
2927                                                                 ] )
2928                                                                 . '}'
2929                                                 )
2930                                         ] )
2931                                 );
2932                                 // FIXME: If the user is previewing, say, ./vector.js, his ./common.js will be loaded
2933                                 // asynchronously and may arrive *after* the inline script here. So the previewed code
2934                                 // may execute before ./common.js runs. Normally, ./common.js runs before ./vector.js.
2935                                 // Similarly, when previewing ./common.js and the user module does arrive first,
2936                                 // it will arrive without common.js and the inline script runs after.
2937                                 // Thus running common after the excluded subpage.
2938                         } else {
2939                                 // Load normally
2940                                 $chunks[] = $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_COMBINED );
2941                         }
2942                 }
2943
2944                 $chunks[] = ResourceLoader::makeInlineScript(
2945                         ResourceLoader::makeConfigSetScript(
2946                                 [ 'wgPageParseReport' => $this->limitReportData ],
2947                                 true
2948                         )
2949                 );
2950
2951                 return self::combineWrappedStrings( $chunks );
2952         }
2953
2954         /**
2955          * Get the javascript config vars to include on this page
2956          *
2957          * @return array Array of javascript config vars
2958          * @since 1.23
2959          */
2960         public function getJsConfigVars() {
2961                 return $this->mJsConfigVars;
2962         }
2963
2964         /**
2965          * Add one or more variables to be set in mw.config in JavaScript
2966          *
2967          * @param string|array $keys Key or array of key/value pairs
2968          * @param mixed $value [optional] Value of the configuration variable
2969          */
2970         public function addJsConfigVars( $keys, $value = null ) {
2971                 if ( is_array( $keys ) ) {
2972                         foreach ( $keys as $key => $value ) {
2973                                 $this->mJsConfigVars[$key] = $value;
2974                         }
2975                         return;
2976                 }
2977
2978                 $this->mJsConfigVars[$keys] = $value;
2979         }
2980
2981         /**
2982          * Get an array containing the variables to be set in mw.config in JavaScript.
2983          *
2984          * Do not add things here which can be evaluated in ResourceLoaderStartUpModule
2985          * - in other words, page-independent/site-wide variables (without state).
2986          * You will only be adding bloat to the html page and causing page caches to
2987          * have to be purged on configuration changes.
2988          * @return array
2989          */
2990         public function getJSVars() {
2991                 global $wgContLang;
2992
2993                 $curRevisionId = 0;
2994                 $articleId = 0;
2995                 $canonicalSpecialPageName = false; # bug 21115
2996
2997                 $title = $this->getTitle();
2998                 $ns = $title->getNamespace();
2999                 $canonicalNamespace = MWNamespace::exists( $ns )
3000                         ? MWNamespace::getCanonicalName( $ns )
3001                         : $title->getNsText();
3002
3003                 $sk = $this->getSkin();
3004                 // Get the relevant title so that AJAX features can use the correct page name
3005                 // when making API requests from certain special pages (bug 34972).
3006                 $relevantTitle = $sk->getRelevantTitle();
3007                 $relevantUser = $sk->getRelevantUser();
3008
3009                 if ( $ns == NS_SPECIAL ) {
3010                         list( $canonicalSpecialPageName, /*...*/ ) =
3011                                 SpecialPageFactory::resolveAlias( $title->getDBkey() );
3012                 } elseif ( $this->canUseWikiPage() ) {
3013                         $wikiPage = $this->getWikiPage();
3014                         $curRevisionId = $wikiPage->getLatest();
3015                         $articleId = $wikiPage->getId();
3016                 }
3017
3018                 $lang = $title->getPageViewLanguage();
3019
3020                 // Pre-process information
3021                 $separatorTransTable = $lang->separatorTransformTable();
3022                 $separatorTransTable = $separatorTransTable ? $separatorTransTable : [];
3023                 $compactSeparatorTransTable = [
3024                         implode( "\t", array_keys( $separatorTransTable ) ),
3025                         implode( "\t", $separatorTransTable ),
3026                 ];
3027                 $digitTransTable = $lang->digitTransformTable();
3028                 $digitTransTable = $digitTransTable ? $digitTransTable : [];
3029                 $compactDigitTransTable = [
3030                         implode( "\t", array_keys( $digitTransTable ) ),
3031                         implode( "\t", $digitTransTable ),
3032                 ];
3033
3034                 $user = $this->getUser();
3035
3036                 $vars = [
3037                         'wgCanonicalNamespace' => $canonicalNamespace,
3038                         'wgCanonicalSpecialPageName' => $canonicalSpecialPageName,
3039                         'wgNamespaceNumber' => $title->getNamespace(),
3040                         'wgPageName' => $title->getPrefixedDBkey(),
3041                         'wgTitle' => $title->getText(),
3042                         'wgCurRevisionId' => $curRevisionId,
3043                         'wgRevisionId' => (int)$this->getRevisionId(),
3044                         'wgArticleId' => $articleId,
3045                         'wgIsArticle' => $this->isArticle(),
3046                         'wgIsRedirect' => $title->isRedirect(),
3047                         'wgAction' => Action::getActionName( $this->getContext() ),
3048                         'wgUserName' => $user->isAnon() ? null : $user->getName(),
3049                         'wgUserGroups' => $user->getEffectiveGroups(),
3050                         'wgCategories' => $this->getCategories(),
3051                         'wgBreakFrames' => $this->getFrameOptions() == 'DENY',
3052                         'wgPageContentLanguage' => $lang->getCode(),
3053                         'wgPageContentModel' => $title->getContentModel(),
3054                         'wgSeparatorTransformTable' => $compactSeparatorTransTable,
3055                         'wgDigitTransformTable' => $compactDigitTransTable,
3056                         'wgDefaultDateFormat' => $lang->getDefaultDateFormat(),
3057                         'wgMonthNames' => $lang->getMonthNamesArray(),
3058                         'wgMonthNamesShort' => $lang->getMonthAbbreviationsArray(),
3059                         'wgRelevantPageName' => $relevantTitle->getPrefixedDBkey(),
3060                         'wgRelevantArticleId' => $relevantTitle->getArticleID(),
3061                         'wgRequestId' => WebRequest::getRequestId(),
3062                 ];
3063
3064                 if ( $user->isLoggedIn() ) {
3065                         $vars['wgUserId'] = $user->getId();
3066                         $vars['wgUserEditCount'] = $user->getEditCount();
3067                         $userReg = wfTimestampOrNull( TS_UNIX, $user->getRegistration() );
3068                         $vars['wgUserRegistration'] = $userReg !== null ? ( $userReg * 1000 ) : null;
3069                         // Get the revision ID of the oldest new message on the user's talk
3070                         // page. This can be used for constructing new message alerts on
3071                         // the client side.
3072                         $vars['wgUserNewMsgRevisionId'] = $user->getNewMessageRevisionId();
3073                 }
3074
3075                 if ( $wgContLang->hasVariants() ) {
3076                         $vars['wgUserVariant'] = $wgContLang->getPreferredVariant();
3077                 }
3078                 // Same test as SkinTemplate
3079                 $vars['wgIsProbablyEditable'] = $title->quickUserCan( 'edit', $user )
3080                         && ( $title->exists() || $title->quickUserCan( 'create', $user ) );
3081
3082                 foreach ( $title->getRestrictionTypes() as $type ) {
3083                         $vars['wgRestriction' . ucfirst( $type )] = $title->getRestrictions( $type );
3084                 }
3085
3086                 if ( $title->isMainPage() ) {
3087                         $vars['wgIsMainPage'] = true;
3088                 }
3089
3090                 if ( $this->mRedirectedFrom ) {
3091                         $vars['wgRedirectedFrom'] = $this->mRedirectedFrom->getPrefixedDBkey();
3092                 }
3093
3094                 if ( $relevantUser ) {
3095                         $vars['wgRelevantUserName'] = $relevantUser->getName();
3096                 }
3097
3098                 // Allow extensions to add their custom variables to the mw.config map.
3099                 // Use the 'ResourceLoaderGetConfigVars' hook if the variable is not
3100                 // page-dependant but site-wide (without state).
3101                 // Alternatively, you may want to use OutputPage->addJsConfigVars() instead.
3102                 Hooks::run( 'MakeGlobalVariablesScript', [ &$vars, $this ] );
3103
3104                 // Merge in variables from addJsConfigVars last
3105                 return array_merge( $vars, $this->getJsConfigVars() );
3106         }
3107
3108         /**
3109          * To make it harder for someone to slip a user a fake
3110          * user-JavaScript or user-CSS preview, a random token
3111          * is associated with the login session. If it's not
3112          * passed back with the preview request, we won't render
3113          * the code.
3114          *
3115          * @return bool
3116          */
3117         public function userCanPreview() {
3118                 $request = $this->getRequest();
3119                 if (
3120                         $request->getVal( 'action' ) !== 'submit' ||
3121                         !$request->getCheck( 'wpPreview' ) ||
3122                         !$request->wasPosted()
3123                 ) {
3124                         return false;
3125                 }
3126
3127                 $user = $this->getUser();
3128
3129                 if ( !$user->isLoggedIn() ) {
3130                         // Anons have predictable edit tokens
3131                         return false;
3132                 }
3133                 if ( !$user->matchEditToken( $request->getVal( 'wpEditToken' ) ) ) {
3134                         return false;
3135                 }
3136
3137                 $title = $this->getTitle();
3138                 if ( !$title->isJsSubpage() && !$title->isCssSubpage() ) {
3139                         return false;
3140                 }
3141                 if ( !$title->isSubpageOf( $user->getUserPage() ) ) {
3142                         // Don't execute another user's CSS or JS on preview (T85855)
3143                         return false;
3144                 }
3145
3146                 $errors = $title->getUserPermissionsErrors( 'edit', $user );
3147                 if ( count( $errors ) !== 0 ) {
3148                         return false;
3149                 }
3150
3151                 return true;
3152         }
3153
3154         /**
3155          * @return array Array in format "link name or number => 'link html'".
3156          */
3157         public function getHeadLinksArray() {
3158                 global $wgVersion;
3159
3160                 $tags = [];
3161                 $config = $this->getConfig();
3162
3163                 $canonicalUrl = $this->mCanonicalUrl;
3164
3165                 $tags['meta-generator'] = Html::element( 'meta', [
3166                         'name' => 'generator',
3167                         'content' => "MediaWiki $wgVersion",
3168                 ] );
3169
3170                 if ( $config->get( 'ReferrerPolicy' ) !== false ) {
3171                         $tags['meta-referrer'] = Html::element( 'meta', [
3172                                 'name' => 'referrer',
3173                                 'content' => $config->get( 'ReferrerPolicy' )
3174                         ] );
3175                 }
3176
3177                 $p = "{$this->mIndexPolicy},{$this->mFollowPolicy}";
3178                 if ( $p !== 'index,follow' ) {
3179                         // http://www.robotstxt.org/wc/meta-user.html
3180                         // Only show if it's different from the default robots policy
3181                         $tags['meta-robots'] = Html::element( 'meta', [
3182                                 'name' => 'robots',
3183                                 'content' => $p,
3184                         ] );
3185                 }
3186
3187                 foreach ( $this->mMetatags as $tag ) {
3188                         if ( 0 == strcasecmp( 'http:', substr( $tag[0], 0, 5 ) ) ) {
3189                                 $a = 'http-equiv';
3190                                 $tag[0] = substr( $tag[0], 5 );
3191                         } else {
3192                                 $a = 'name';
3193                         }
3194                         $tagName = "meta-{$tag[0]}";
3195                         if ( isset( $tags[$tagName] ) ) {
3196                                 $tagName .= $tag[1];
3197                         }
3198                         $tags[$tagName] = Html::element( 'meta',
3199                                 [
3200                                         $a => $tag[0],
3201                                         'content' => $tag[1]
3202                                 ]
3203                         );
3204                 }
3205
3206                 foreach ( $this->mLinktags as $tag ) {
3207                         $tags[] = Html::element( 'link', $tag );
3208                 }
3209
3210                 # Universal edit button
3211                 if ( $config->get( 'UniversalEditButton' ) && $this->isArticleRelated() ) {
3212                         $user = $this->getUser();
3213                         if ( $this->getTitle()->quickUserCan( 'edit', $user )
3214                                 && ( $this->getTitle()->exists() ||
3215                                         $this->getTitle()->quickUserCan( 'create', $user ) )
3216                         ) {
3217                                 // Original UniversalEditButton
3218                                 $msg = $this->msg( 'edit' )->text();
3219                                 $tags['universal-edit-button'] = Html::element( 'link', [
3220                                         'rel' => 'alternate',
3221                                         'type' => 'application/x-wiki',
3222                                         'title' => $msg,
3223                                         'href' => $this->getTitle()->getEditURL(),
3224                                 ] );
3225                                 // Alternate edit link
3226                                 $tags['alternative-edit'] = Html::element( 'link', [
3227                                         'rel' => 'edit',
3228                                         'title' => $msg,
3229                                         'href' => $this->getTitle()->getEditURL(),
3230                                 ] );
3231                         }
3232                 }
3233
3234                 # Generally the order of the favicon and apple-touch-icon links
3235                 # should not matter, but Konqueror (3.5.9 at least) incorrectly
3236                 # uses whichever one appears later in the HTML source. Make sure
3237                 # apple-touch-icon is specified first to avoid this.
3238                 if ( $config->get( 'AppleTouchIcon' ) !== false ) {
3239                         $tags['apple-touch-icon'] = Html::element( 'link', [
3240                                 'rel' => 'apple-touch-icon',
3241                                 'href' => $config->get( 'AppleTouchIcon' )
3242                         ] );
3243                 }
3244
3245                 if ( $config->get( 'Favicon' ) !== false ) {
3246                         $tags['favicon'] = Html::element( 'link', [
3247                                 'rel' => 'shortcut icon',
3248                                 'href' => $config->get( 'Favicon' )
3249                         ] );
3250                 }
3251
3252                 # OpenSearch description link
3253                 $tags['opensearch'] = Html::element( 'link', [
3254                         'rel' => 'search',
3255                         'type' => 'application/opensearchdescription+xml',
3256                         'href' => wfScript( 'opensearch_desc' ),
3257                         'title' => $this->msg( 'opensearch-desc' )->inContentLanguage()->text(),
3258                 ] );
3259
3260                 if ( $config->get( 'EnableAPI' ) ) {
3261                         # Real Simple Discovery link, provides auto-discovery information
3262                         # for the MediaWiki API (and potentially additional custom API
3263                         # support such as WordPress or Twitter-compatible APIs for a
3264                         # blogging extension, etc)
3265                         $tags['rsd'] = Html::element( 'link', [
3266                                 'rel' => 'EditURI',
3267                                 'type' => 'application/rsd+xml',
3268                                 // Output a protocol-relative URL here if $wgServer is protocol-relative.
3269                                 // Whether RSD accepts relative or protocol-relative URLs is completely
3270                                 // undocumented, though.
3271                                 'href' => wfExpandUrl( wfAppendQuery(
3272                                         wfScript( 'api' ),
3273                                         [ 'action' => 'rsd' ] ),
3274                                         PROTO_RELATIVE
3275                                 ),
3276                         ] );
3277                 }
3278
3279                 # Language variants
3280                 if ( !$config->get( 'DisableLangConversion' ) ) {
3281                         $lang = $this->getTitle()->getPageLanguage();
3282                         if ( $lang->hasVariants() ) {
3283                                 $variants = $lang->getVariants();
3284                                 foreach ( $variants as $variant ) {
3285                                         $tags["variant-$variant"] = Html::element( 'link', [
3286                                                 'rel' => 'alternate',
3287                                                 'hreflang' => wfBCP47( $variant ),
3288                                                 'href' => $this->getTitle()->getLocalURL(
3289                                                         [ 'variant' => $variant ] )
3290                                                 ]
3291                                         );
3292                                 }
3293                                 # x-default link per https://support.google.com/webmasters/answer/189077?hl=en
3294                                 $tags["variant-x-default"] = Html::element( 'link', [
3295                                         'rel' => 'alternate',
3296                                         'hreflang' => 'x-default',
3297                                         'href' => $this->getTitle()->getLocalURL() ] );
3298                         }
3299                 }
3300
3301                 # Copyright
3302                 if ( $this->copyrightUrl !== null ) {
3303                         $copyright = $this->copyrightUrl;
3304                 } else {
3305                         $copyright = '';
3306                         if ( $config->get( 'RightsPage' ) ) {
3307                                 $copy = Title::newFromText( $config->get( 'RightsPage' ) );
3308
3309                                 if ( $copy ) {
3310                                         $copyright = $copy->getLocalURL();
3311                                 }
3312                         }
3313
3314                         if ( !$copyright && $config->get( 'RightsUrl' ) ) {
3315                                 $copyright = $config->get( 'RightsUrl' );
3316                         }
3317                 }
3318
3319                 if ( $copyright ) {
3320                         $tags['copyright'] = Html::element( 'link', [
3321                                 'rel' => 'copyright',
3322                                 'href' => $copyright ]
3323                         );
3324                 }
3325
3326                 # Feeds
3327                 if ( $config->get( 'Feed' ) ) {
3328                         $feedLinks = [];
3329
3330                         foreach ( $this->getSyndicationLinks() as $format => $link ) {
3331                                 # Use the page name for the title.  In principle, this could
3332                                 # lead to issues with having the same name for different feeds
3333                                 # corresponding to the same page, but we can't avoid that at
3334                                 # this low a level.
3335
3336                                 $feedLinks[] = $this->feedLink(
3337                                         $format,
3338                                         $link,
3339                                         # Used messages: 'page-rss-feed' and 'page-atom-feed' (for an easier grep)
3340                                         $this->msg(
3341                                                 "page-{$format}-feed", $this->getTitle()->getPrefixedText()
3342                                         )->text()
3343                                 );
3344                         }
3345
3346                         # Recent changes feed should appear on every page (except recentchanges,
3347                         # that would be redundant). Put it after the per-page feed to avoid
3348                         # changing existing behavior. It's still available, probably via a
3349                         # menu in your browser. Some sites might have a different feed they'd
3350                         # like to promote instead of the RC feed (maybe like a "Recent New Articles"
3351                         # or "Breaking news" one). For this, we see if $wgOverrideSiteFeed is defined.
3352                         # If so, use it instead.
3353                         $sitename = $config->get( 'Sitename' );
3354                         if ( $config->get( 'OverrideSiteFeed' ) ) {
3355                                 foreach ( $config->get( 'OverrideSiteFeed' ) as $type => $feedUrl ) {
3356                                         // Note, this->feedLink escapes the url.
3357                                         $feedLinks[] = $this->feedLink(
3358                                                 $type,
3359                                                 $feedUrl,
3360                                                 $this->msg( "site-{$type}-feed", $sitename )->text()
3361                                         );
3362                                 }
3363                         } elseif ( !$this->getTitle()->isSpecial( 'Recentchanges' ) ) {
3364                                 $rctitle = SpecialPage::getTitleFor( 'Recentchanges' );
3365                                 foreach ( $config->get( 'AdvertisedFeedTypes' ) as $format ) {
3366                                         $feedLinks[] = $this->feedLink(
3367                                                 $format,
3368                                                 $rctitle->getLocalURL( [ 'feed' => $format ] ),
3369                                                 # For grep: 'site-rss-feed', 'site-atom-feed'
3370                                                 $this->msg( "site-{$format}-feed", $sitename )->text()
3371                                         );
3372                                 }
3373                         }
3374
3375                         # Allow extensions to change the list pf feeds. This hook is primarily for changing,
3376                         # manipulating or removing existing feed tags. If you want to add new feeds, you should
3377                         # use OutputPage::addFeedLink() instead.
3378                         Hooks::run( 'AfterBuildFeedLinks', [ &$feedLinks ] );
3379
3380                         $tags += $feedLinks;
3381                 }
3382
3383                 # Canonical URL
3384                 if ( $config->get( 'EnableCanonicalServerLink' ) ) {
3385                         if ( $canonicalUrl !== false ) {
3386                                 $canonicalUrl = wfExpandUrl( $canonicalUrl, PROTO_CANONICAL );
3387                         } else {
3388                                 if ( $this->isArticleRelated() ) {
3389                                         // This affects all requests where "setArticleRelated" is true. This is
3390                                         // typically all requests that show content (query title, curid, oldid, diff),
3391                                         // and all wikipage actions (edit, delete, purge, info, history etc.).
3392                                         // It does not apply to File pages and Special pages.
3393                                         // 'history' and 'info' actions address page metadata rather than the page
3394                                         // content itself, so they may not be canonicalized to the view page url.
3395                                         // TODO: this ought to be better encapsulated in the Action class.
3396                                         $action = Action::getActionName( $this->getContext() );
3397                                         if ( in_array( $action, [ 'history', 'info' ] ) ) {
3398                                                 $query = "action={$action}";
3399                                         } else {
3400                                                 $query = '';
3401                                         }
3402                                         $canonicalUrl = $this->getTitle()->getCanonicalURL( $query );
3403                                 } else {
3404                                         $reqUrl = $this->getRequest()->getRequestURL();
3405                                         $canonicalUrl = wfExpandUrl( $reqUrl, PROTO_CANONICAL );
3406                                 }
3407                         }
3408                 }
3409                 if ( $canonicalUrl !== false ) {
3410                         $tags[] = Html::element( 'link', [
3411                                 'rel' => 'canonical',
3412                                 'href' => $canonicalUrl
3413                         ] );
3414                 }
3415
3416                 return $tags;
3417         }
3418
3419         /**
3420          * @return string HTML tag links to be put in the header.
3421          * @deprecated since 1.24 Use OutputPage::headElement or if you have to,
3422          *   OutputPage::getHeadLinksArray directly.
3423          */
3424         public function getHeadLinks() {
3425                 wfDeprecated( __METHOD__, '1.24' );
3426                 return implode( "\n", $this->getHeadLinksArray() );
3427         }
3428
3429         /**
3430          * Generate a "<link rel/>" for a feed.
3431          *
3432          * @param string $type Feed type
3433          * @param string $url URL to the feed
3434          * @param string $text Value of the "title" attribute
3435          * @return string HTML fragment
3436          */
3437         private function feedLink( $type, $url, $text ) {
3438                 return Html::element( 'link', [
3439                         'rel' => 'alternate',
3440                         'type' => "application/$type+xml",
3441                         'title' => $text,
3442                         'href' => $url ]
3443                 );
3444         }
3445
3446         /**
3447          * Add a local or specified stylesheet, with the given media options.
3448          * Internal use only. Use OutputPage::addModuleStyles() if possible.
3449          *
3450          * @param string $style URL to the file
3451          * @param string $media To specify a media type, 'screen', 'printable', 'handheld' or any.
3452          * @param string $condition For IE conditional comments, specifying an IE version
3453          * @param string $dir Set to 'rtl' or 'ltr' for direction-specific sheets
3454          */
3455         public function addStyle( $style, $media = '', $condition = '', $dir = '' ) {
3456                 $options = [];
3457                 if ( $media ) {
3458                         $options['media'] = $media;
3459                 }
3460                 if ( $condition ) {
3461                         $options['condition'] = $condition;
3462                 }
3463                 if ( $dir ) {
3464                         $options['dir'] = $dir;
3465                 }
3466                 $this->styles[$style] = $options;
3467         }
3468
3469         /**
3470          * Adds inline CSS styles
3471          * Internal use only. Use OutputPage::addModuleStyles() if possible.
3472          *
3473          * @param mixed $style_css Inline CSS
3474          * @param string $flip Set to 'flip' to flip the CSS if needed
3475          */
3476         public function addInlineStyle( $style_css, $flip = 'noflip' ) {
3477                 if ( $flip === 'flip' && $this->getLanguage()->isRTL() ) {
3478                         # If wanted, and the interface is right-to-left, flip the CSS
3479                         $style_css = CSSJanus::transform( $style_css, true, false );
3480                 }
3481                 $this->mInlineStyles .= Html::inlineStyle( $style_css );
3482         }
3483
3484         /**
3485          * Build exempt modules and legacy non-ResourceLoader styles.
3486          *
3487          * @return string|WrappedStringList HTML
3488          */
3489         protected function buildExemptModules() {
3490                 global $wgContLang;
3491
3492                 $resourceLoader = $this->getResourceLoader();
3493                 $chunks = [];
3494                 // Things that go after the ResourceLoaderDynamicStyles marker
3495                 $append = [];
3496
3497                 // Exempt 'user' styles module (may need 'excludepages' for live preview)
3498                 if ( $this->isUserCssPreview() ) {
3499                         $append[] = $this->makeResourceLoaderLink(
3500                                 'user.styles',
3501                                 ResourceLoaderModule::TYPE_STYLES,
3502                                 [ 'excludepage' => $this->getTitle()->getPrefixedDBkey() ]
3503                         );
3504
3505                         // Load the previewed CSS. Janus it if needed.
3506                         // User-supplied CSS is assumed to in the wiki's content language.
3507                         $previewedCSS = $this->getRequest()->getText( 'wpTextbox1' );
3508                         if ( $this->getLanguage()->getDir() !== $wgContLang->getDir() ) {
3509                                 $previewedCSS = CSSJanus::transform( $previewedCSS, true, false );
3510                         }
3511                         $append[] = Html::inlineStyle( $previewedCSS );
3512                 }
3513
3514                 // We want site, private and user styles to override dynamically added styles from
3515                 // general modules, but we want dynamically added styles to override statically added
3516                 // style modules. So the order has to be:
3517                 // - page style modules (formatted by ResourceLoaderClientHtml::getHeadHtml())
3518                 // - dynamically loaded styles (added by mw.loader before ResourceLoaderDynamicStyles)
3519                 // - ResourceLoaderDynamicStyles marker
3520                 // - site/private/user styles
3521
3522                 // Add legacy styles added through addStyle()/addInlineStyle() here
3523                 $chunks[] = implode( '', $this->buildCssLinksArray() ) . $this->mInlineStyles;
3524
3525                 $chunks[] = Html::element(
3526                         'meta',
3527                         [ 'name' => 'ResourceLoaderDynamicStyles', 'content' => '' ]
3528                 );
3529
3530                 foreach ( $this->rlExemptStyleModules as $group => $moduleNames ) {
3531                         $chunks[] = $this->makeResourceLoaderLink( $moduleNames,
3532                                 ResourceLoaderModule::TYPE_STYLES
3533                         );
3534                 }
3535
3536                 return self::combineWrappedStrings( array_merge( $chunks, $append ) );
3537         }
3538
3539         /**
3540          * @return array
3541          */
3542         public function buildCssLinksArray() {
3543                 $links = [];
3544
3545                 // Add any extension CSS
3546                 foreach ( $this->mExtStyles as $url ) {
3547                         $this->addStyle( $url );
3548                 }
3549                 $this->mExtStyles = [];
3550
3551                 foreach ( $this->styles as $file => $options ) {
3552                         $link = $this->styleLink( $file, $options );
3553                         if ( $link ) {
3554                                 $links[$file] = $link;
3555                         }
3556                 }
3557                 return $links;
3558         }
3559
3560         /**
3561          * Generate \<link\> tags for stylesheets
3562          *
3563          * @param string $style URL to the file
3564          * @param array $options Option, can contain 'condition', 'dir', 'media' keys
3565          * @return string HTML fragment
3566          */
3567         protected function styleLink( $style, array $options ) {
3568                 if ( isset( $options['dir'] ) ) {
3569                         if ( $this->getLanguage()->getDir() != $options['dir'] ) {
3570                                 return '';
3571                         }
3572                 }
3573
3574                 if ( isset( $options['media'] ) ) {
3575                         $media = self::transformCssMedia( $options['media'] );
3576                         if ( is_null( $media ) ) {
3577                                 return '';
3578                         }
3579                 } else {
3580                         $media = 'all';
3581                 }
3582
3583                 if ( substr( $style, 0, 1 ) == '/' ||
3584                         substr( $style, 0, 5 ) == 'http:' ||
3585                         substr( $style, 0, 6 ) == 'https:' ) {
3586                         $url = $style;
3587                 } else {
3588                         $config = $this->getConfig();
3589                         $url = $config->get( 'StylePath' ) . '/' . $style . '?' .
3590                                 $config->get( 'StyleVersion' );
3591                 }
3592
3593                 $link = Html::linkedStyle( $url, $media );
3594
3595                 if ( isset( $options['condition'] ) ) {
3596                         $condition = htmlspecialchars( $options['condition'] );
3597                         $link = "<!--[if $condition]>$link<![endif]-->";
3598                 }
3599                 return $link;
3600         }
3601
3602         /**
3603          * Transform path to web-accessible static resource.
3604          *
3605          * This is used to add a validation hash as query string.
3606          * This aids various behaviors:
3607          *
3608          * - Put long Cache-Control max-age headers on responses for improved
3609          *   cache performance.
3610          * - Get the correct version of a file as expected by the current page.
3611          * - Instantly get the updated version of a file after deployment.
3612          *
3613          * Avoid using this for urls included in HTML as otherwise clients may get different
3614          * versions of a resource when navigating the site depending on when the page was cached.
3615          * If changes to the url propagate, this is not a problem (e.g. if the url is in
3616          * an external stylesheet).
3617          *
3618          * @since 1.27
3619          * @param Config $config
3620          * @param string $path Path-absolute URL to file (from document root, must start with "/")
3621          * @return string URL
3622          */
3623         public static function transformResourcePath( Config $config, $path ) {
3624                 global $IP;
3625                 $remotePathPrefix = $config->get( 'ResourceBasePath' );
3626                 if ( $remotePathPrefix === '' ) {
3627                         // The configured base path is required to be empty string for
3628                         // wikis in the domain root
3629                         $remotePath = '/';
3630                 } else {
3631                         $remotePath = $remotePathPrefix;
3632                 }
3633                 if ( strpos( $path, $remotePath ) !== 0 ) {
3634                         // Path is outside wgResourceBasePath, ignore.
3635                         return $path;
3636                 }
3637                 $path = RelPath\getRelativePath( $path, $remotePath );
3638                 return self::transformFilePath( $remotePathPrefix, $IP, $path );
3639         }
3640
3641         /**
3642          * Utility method for transformResourceFilePath().
3643          *
3644          * Caller is responsible for ensuring the file exists. Emits a PHP warning otherwise.
3645          *
3646          * @since 1.27
3647          * @param string $remotePath URL path prefix that points to $localPath
3648          * @param string $localPath File directory exposed at $remotePath
3649          * @param string $file Path to target file relative to $localPath
3650          * @return string URL
3651          */
3652         public static function transformFilePath( $remotePathPrefix, $localPath, $file ) {
3653                 $hash = md5_file( "$localPath/$file" );
3654                 if ( $hash === false ) {
3655                         wfLogWarning( __METHOD__ . ": Failed to hash $localPath/$file" );
3656                         $hash = '';
3657                 }
3658                 return "$remotePathPrefix/$file?" . substr( $hash, 0, 5 );
3659         }
3660
3661         /**
3662          * Transform "media" attribute based on request parameters
3663          *
3664          * @param string $media Current value of the "media" attribute
3665          * @return string Modified value of the "media" attribute, or null to skip
3666          * this stylesheet
3667          */
3668         public static function transformCssMedia( $media ) {
3669                 global $wgRequest;
3670
3671                 // http://www.w3.org/TR/css3-mediaqueries/#syntax
3672                 $screenMediaQueryRegex = '/^(?:only\s+)?screen\b/i';
3673
3674                 // Switch in on-screen display for media testing
3675                 $switches = [
3676                         'printable' => 'print',
3677                         'handheld' => 'handheld',
3678                 ];
3679                 foreach ( $switches as $switch => $targetMedia ) {
3680                         if ( $wgRequest->getBool( $switch ) ) {
3681                                 if ( $media == $targetMedia ) {
3682                                         $media = '';
3683                                 } elseif ( preg_match( $screenMediaQueryRegex, $media ) === 1 ) {
3684                                         /* This regex will not attempt to understand a comma-separated media_query_list
3685                                          *
3686                                          * Example supported values for $media:
3687                                          * 'screen', 'only screen', 'screen and (min-width: 982px)' ),
3688                                          * Example NOT supported value for $media:
3689                                          * '3d-glasses, screen, print and resolution > 90dpi'
3690                                          *
3691                                          * If it's a print request, we never want any kind of screen stylesheets
3692                                          * If it's a handheld request (currently the only other choice with a switch),
3693                                          * we don't want simple 'screen' but we might want screen queries that
3694                                          * have a max-width or something, so we'll pass all others on and let the
3695                                          * client do the query.
3696                                          */
3697                                         if ( $targetMedia == 'print' || $media == 'screen' ) {
3698                                                 return null;
3699                                         }
3700                                 }
3701                         }
3702                 }
3703
3704                 return $media;
3705         }
3706
3707         /**
3708          * Add a wikitext-formatted message to the output.
3709          * This is equivalent to:
3710          *
3711          *    $wgOut->addWikiText( wfMessage( ... )->plain() )
3712          */
3713         public function addWikiMsg( /*...*/ ) {
3714                 $args = func_get_args();
3715                 $name = array_shift( $args );
3716                 $this->addWikiMsgArray( $name, $args );
3717         }
3718
3719         /**
3720          * Add a wikitext-formatted message to the output.
3721          * Like addWikiMsg() except the parameters are taken as an array
3722          * instead of a variable argument list.
3723          *
3724          * @param string $name
3725          * @param array $args
3726          */
3727         public function addWikiMsgArray( $name, $args ) {
3728                 $this->addHTML( $this->msg( $name, $args )->parseAsBlock() );
3729         }
3730
3731         /**
3732          * This function takes a number of message/argument specifications, wraps them in
3733          * some overall structure, and then parses the result and adds it to the output.
3734          *
3735          * In the $wrap, $1 is replaced with the first message, $2 with the second,
3736          * and so on. The subsequent arguments may be either
3737          * 1) strings, in which case they are message names, or
3738          * 2) arrays, in which case, within each array, the first element is the message
3739          *    name, and subsequent elements are the parameters to that message.
3740          *
3741          * Don't use this for messages that are not in the user's interface language.
3742          *
3743          * For example:
3744          *
3745          *    $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>", 'some-error' );
3746          *
3747          * Is equivalent to:
3748          *
3749          *    $wgOut->addWikiText( "<div class='error'>\n"
3750          *        . wfMessage( 'some-error' )->plain() . "\n</div>" );
3751          *
3752          * The newline after the opening div is needed in some wikitext. See bug 19226.
3753          *
3754          * @param string $wrap
3755          */
3756         public function wrapWikiMsg( $wrap /*, ...*/ ) {
3757                 $msgSpecs = func_get_args();
3758                 array_shift( $msgSpecs );
3759                 $msgSpecs = array_values( $msgSpecs );
3760                 $s = $wrap;
3761                 foreach ( $msgSpecs as $n => $spec ) {
3762                         if ( is_array( $spec ) ) {
3763                                 $args = $spec;
3764                                 $name = array_shift( $args );
3765                                 if ( isset( $args['options'] ) ) {
3766                                         unset( $args['options'] );
3767                                         wfDeprecated(
3768                                                 'Adding "options" to ' . __METHOD__ . ' is no longer supported',
3769                                                 '1.20'
3770                                         );
3771                                 }
3772                         } else {
3773                                 $args = [];
3774                                 $name = $spec;
3775                         }
3776                         $s = str_replace( '$' . ( $n + 1 ), $this->msg( $name, $args )->plain(), $s );
3777                 }
3778                 $this->addWikiText( $s );
3779         }
3780
3781         /**
3782          * Enables/disables TOC, doesn't override __NOTOC__
3783          * @param bool $flag
3784          * @since 1.22
3785          */
3786         public function enableTOC( $flag = true ) {
3787                 $this->mEnableTOC = $flag;
3788         }
3789
3790         /**
3791          * @return bool
3792          * @since 1.22
3793          */
3794         public function isTOCEnabled() {
3795                 return $this->mEnableTOC;
3796         }
3797
3798         /**
3799          * Enables/disables section edit links, doesn't override __NOEDITSECTION__
3800          * @param bool $flag
3801          * @since 1.23
3802          */
3803         public function enableSectionEditLinks( $flag = true ) {
3804                 $this->mEnableSectionEditLinks = $flag;
3805         }
3806
3807         /**
3808          * @return bool
3809          * @since 1.23
3810          */
3811         public function sectionEditLinksEnabled() {
3812                 return $this->mEnableSectionEditLinks;
3813         }
3814
3815         /**
3816          * Helper function to setup the PHP implementation of OOUI to use in this request.
3817          *
3818          * @since 1.26
3819          * @param String $skinName The Skin name to determine the correct OOUI theme
3820          * @param String $dir Language direction
3821          */
3822         public static function setupOOUI( $skinName = '', $dir = 'ltr' ) {
3823                 $themes = ExtensionRegistry::getInstance()->getAttribute( 'SkinOOUIThemes' );
3824                 // Make keys (skin names) lowercase for case-insensitive matching.
3825                 $themes = array_change_key_case( $themes, CASE_LOWER );
3826                 $theme = isset( $themes[$skinName] ) ? $themes[$skinName] : 'MediaWiki';
3827                 // For example, 'OOUI\MediaWikiTheme'.
3828                 $themeClass = "OOUI\\{$theme}Theme";
3829                 OOUI\Theme::setSingleton( new $themeClass() );
3830                 OOUI\Element::setDefaultDir( $dir );
3831         }
3832
3833         /**
3834          * Add ResourceLoader module styles for OOUI and set up the PHP implementation of it for use with
3835          * MediaWiki and this OutputPage instance.
3836          *
3837          * @since 1.25
3838          */
3839         public function enableOOUI() {
3840                 self::setupOOUI(
3841                         strtolower( $this->getSkin()->getSkinName() ),
3842                         $this->getLanguage()->getDir()
3843                 );
3844                 $this->addModuleStyles( [
3845                         'oojs-ui-core.styles',
3846                         'oojs-ui.styles.icons',
3847                         'oojs-ui.styles.indicators',
3848                         'oojs-ui.styles.textures',
3849                         'mediawiki.widgets.styles',
3850                 ] );
3851         }
3852
3853         /**
3854          * @param array $data Data from ParserOutput::getLimitReportData()
3855          * @since 1.28
3856          */
3857         public function setLimitReportData( array $data ) {
3858                 $this->limitReportData = $data;
3859         }
3860 }