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 WrappedString\WrappedString;
  25
  26 /**
  27  * This class should be covered by a general architecture document which does
  28  * not exist as of January 2011.  This is one of the Core classes and should
  29  * be read at least once by any new developers.
  30  *
  31  * This class is used to prepare the final rendering. A skin is then
  32  * applied to the output parameters (links, javascript, html, categories ...).
  33  *
  34  * @todo FIXME: Another class handles sending the whole page to the client.
  35  *
  36  * Some comments comes from a pairing session between Zak Greant and Antoine Musso
  37  * in November 2010.
  38  *
  39  * @todo document
  40  */
  41 class OutputPage extends ContextSource {
  42         /** @var array Should be private. Used with addMeta() which adds "<meta>" */
  43         protected $mMetatags = array();
  44
  45         /** @var array */
  46         protected $mLinktags = array();
  47
  48         /** @var bool */
  49         protected $mCanonicalUrl = false;
  50
  51         /**
  52          * @var array Additional stylesheets. Looks like this is for extensions.
  53          *   Might be replaced by ResourceLoader.
  54          */
  55         protected $mExtStyles = array();
  56
  57         /**
  58          * @var string Should be private - has getter and setter. Contains
  59          *   the HTML title */
  60         public $mPagetitle = '';
  61
  62         /**
  63          * @var string Contains all of the "<body>" content. Should be private we
  64          *   got set/get accessors and the append() method.
  65          */
  66         public $mBodytext = '';
  67
  68         /**
  69          * Holds the debug lines that will be output as comments in page source if
  70          * $wgDebugComments is enabled. See also $wgShowDebug.
  71          * @deprecated since 1.20; use MWDebug class instead.
  72          */
  73         public $mDebugtext = '';
  74
  75         /** @var string Stores contents of "<title>" tag */
  76         private $mHTMLtitle = '';
  77
  78         /**
  79          * @var bool Is the displayed content related to the source of the
  80          *   corresponding wiki article.
  81          */
  82         private $mIsarticle = false;
  83
  84         /** @var bool Stores "article flag" toggle. */
  85         private $mIsArticleRelated = true;
  86
  87         /**
  88          * @var bool We have to set isPrintable(). Some pages should
  89          * never be printed (ex: redirections).
  90          */
  91         private $mPrintable = false;
  92
  93         /**
  94          * @var array Contains the page subtitle. Special pages usually have some
  95          *   links here. Don't confuse with site subtitle added by skins.
  96          */
  97         private $mSubtitle = array();
  98
  99         /** @var string */
 100         public $mRedirect = '';
 101
 102         /** @var int */
 103         protected $mStatusCode;
 104
 105         /**
 106          * @var string Variable mLastModified and mEtag are used for sending cache control.
 107          *   The whole caching system should probably be moved into its own class.
 108          */
 109         protected $mLastModified = '';
 110
 111         /**
 112          * Contains an HTTP Entity Tags (see RFC 2616 section 3.13) which is used
 113          * as a unique identifier for the content. It is later used by the client
 114          * to compare its cached version with the server version. Client sends
 115          * headers If-Match and If-None-Match containing its locally cached ETAG value.
 116          *
 117          * To get more information, you will have to look at HTTP/1.1 protocol which
 118          * is properly described in RFC 2616 : http://tools.ietf.org/html/rfc2616
 119          */
 120         private $mETag = false;
 121
 122         /** @var array */
 123         protected $mCategoryLinks = array();
 124
 125         /** @var array */
 126         protected $mCategories = array();
 127
 128         /** @var array */
 129         protected $mIndicators = array();
 130
 131         /** @var array Array of Interwiki Prefixed (non DB key) Titles (e.g. 'fr:Test page') */
 132         private $mLanguageLinks = array();
 133
 134         /**
 135          * Used for JavaScript (predates ResourceLoader)
 136          * @todo We should split JS / CSS.
 137          * mScripts content is inserted as is in "<head>" by Skin. This might
 138          * contain either a link to a stylesheet or inline CSS.
 139          */
 140         private $mScripts = '';
 141
 142         /** @var string Inline CSS styles. Use addInlineStyle() sparingly */
 143         protected $mInlineStyles = '';
 144
 145         /**
 146          * @var string Used by skin template.
 147          * Example: $tpl->set( 'displaytitle', $out->mPageLinkTitle );
 148          */
 149         public $mPageLinkTitle = '';
 150
 151         /** @var array Array of elements in "<head>". Parser might add its own headers! */
 152         protected $mHeadItems = array();
 153
 154         /** @var array */
 155         protected $mModules = array();
 156
 157         /** @var array */
 158         protected $mModuleScripts = array();
 159
 160         /** @var array */
 161         protected $mModuleStyles = array();
 162
 163         /** @var ResourceLoader */
 164         protected $mResourceLoader;
 165
 166         /** @var array */
 167         protected $mJsConfigVars = array();
 168
 169         /** @var array */
 170         protected $mTemplateIds = array();
 171
 172         /** @var array */
 173         protected $mImageTimeKeys = array();
 174
 175         /** @var string */
 176         public $mRedirectCode = '';
 177
 178         protected $mFeedLinksAppendQuery = null;
 179
 180         /** @var array
 181          * What level of 'untrustworthiness' is allowed in CSS/JS modules loaded on this page?
 182          * @see ResourceLoaderModule::$origin
 183          * ResourceLoaderModule::ORIGIN_ALL is assumed unless overridden;
 184          */
 185         protected $mAllowedModules = array(
 186                 ResourceLoaderModule::TYPE_COMBINED => ResourceLoaderModule::ORIGIN_ALL,
 187         );
 188
 189         /** @var bool Whether output is disabled.  If this is true, the 'output' method will do nothing. */
 190         protected $mDoNothing = false;
 191
 192         // Parser related.
 193
 194         /** @var int */
 195         protected $mContainsNewMagic = 0;
 196
 197         /**
 198          * lazy initialised, use parserOptions()
 199          * @var ParserOptions
 200          */
 201         protected $mParserOptions = null;
 202
 203         /**
 204          * Handles the Atom / RSS links.
 205          * We probably only support Atom in 2011.
 206          * @see $wgAdvertisedFeedTypes
 207          */
 208         private $mFeedLinks = array();
 209
 210         // Gwicke work on squid caching? Roughly from 2003.
 211         protected $mEnableClientCache = true;
 212
 213         /** @var bool Flag if output should only contain the body of the article. */
 214         private $mArticleBodyOnly = false;
 215
 216         /** @var bool */
 217         protected $mNewSectionLink = false;
 218
 219         /** @var bool */
 220         protected $mHideNewSectionLink = false;
 221
 222         /**
 223          * @var bool Comes from the parser. This was probably made to load CSS/JS
 224          * only if we had "<gallery>". Used directly in CategoryPage.php.
 225          * Looks like ResourceLoader can replace this.
 226          */
 227         public $mNoGallery = false;
 228
 229         /** @var string */
 230         private $mPageTitleActionText = '';
 231
 232         /** @var int Cache stuff. Looks like mEnableClientCache */
 233         protected $mCdnMaxage = 0;
 234         /** @var int Upper limit on mCdnMaxage */
 235         protected $mCdnMaxageLimit = INF;
 236
 237         /**
 238          * @var bool Controls if anti-clickjacking / frame-breaking headers will
 239          * be sent. This should be done for pages where edit actions are possible.
 240          * Setters: $this->preventClickjacking() and $this->allowClickjacking().
 241          */
 242         protected $mPreventClickjacking = true;
 243
 244         /** @var int To include the variable {{REVISIONID}} */
 245         private $mRevisionId = null;
 246
 247         /** @var string */
 248         private $mRevisionTimestamp = null;
 249
 250         /** @var array */
 251         protected $mFileVersion = null;
 252
 253         /**
 254          * @var array An array of stylesheet filenames (relative from skins path),
 255          * with options for CSS media, IE conditions, and RTL/LTR direction.
 256          * For internal use; add settings in the skin via $this->addStyle()
 257          *
 258          * Style again! This seems like a code duplication since we already have
 259          * mStyles. This is what makes Open Source amazing.
 260          */
 261         protected $styles = array();
 262
 263         /**
 264          * Whether jQuery is already handled.
 265          */
 266         protected $mJQueryDone = false;
 267
 268         private $mIndexPolicy = 'index';
 269         private $mFollowPolicy = 'follow';
 270         private $mVaryHeader = array(
 271                 'Accept-Encoding' => array( 'match=gzip' ),
 272         );
 273
 274         /**
 275          * If the current page was reached through a redirect, $mRedirectedFrom contains the Title
 276          * of the redirect.
 277          *
 278          * @var Title
 279          */
 280         private $mRedirectedFrom = null;
 281
 282         /**
 283          * Additional key => value data
 284          */
 285         private $mProperties = array();
 286
 287         /**
 288          * @var string|null ResourceLoader target for load.php links. If null, will be omitted
 289          */
 290         private $mTarget = null;
 291
 292         /**
 293          * @var bool Whether parser output should contain table of contents
 294          */
 295         private $mEnableTOC = true;
 296
 297         /**
 298          * @var bool Whether parser output should contain section edit links
 299          */
 300         private $mEnableSectionEditLinks = true;
 301
 302         /**
 303          * @var string|null The URL to send in a <link> element with rel=copyright
 304          */
 305         private $copyrightUrl;
 306
 307         /**
 308          * Constructor for OutputPage. This should not be called directly.
 309          * Instead a new RequestContext should be created and it will implicitly create
 310          * a OutputPage tied to that context.
 311          * @param IContextSource|null $context
 312          */
 313         function __construct( IContextSource $context = null ) {
 314                 if ( $context === null ) {
 315                         # Extensions should use `new RequestContext` instead of `new OutputPage` now.
 316                         wfDeprecated( __METHOD__, '1.18' );
 317                 } else {
 318                         $this->setContext( $context );
 319                 }
 320         }
 321
 322         /**
 323          * Redirect to $url rather than displaying the normal page
 324          *
 325          * @param string $url URL
 326          * @param string $responsecode HTTP status code
 327          */
 328         public function redirect( $url, $responsecode = '302' ) {
 329                 # Strip newlines as a paranoia check for header injection in PHP<5.1.2
 330                 $this->mRedirect = str_replace( "\n", '', $url );
 331                 $this->mRedirectCode = $responsecode;
 332         }
 333
 334         /**
 335          * Get the URL to redirect to, or an empty string if not redirect URL set
 336          *
 337          * @return string
 338          */
 339         public function getRedirect() {
 340                 return $this->mRedirect;
 341         }
 342
 343         /**
 344          * Set the copyright URL to send with the output.
 345          * Empty string to omit, null to reset.
 346          *
 347          * @since 1.26
 348          *
 349          * @param string|null $url
 350          */
 351         public function setCopyrightUrl( $url ) {
 352                 $this->copyrightUrl = $url;
 353         }
 354
 355         /**
 356          * Set the HTTP status code to send with the output.
 357          *
 358          * @param int $statusCode
 359          */
 360         public function setStatusCode( $statusCode ) {
 361                 $this->mStatusCode = $statusCode;
 362         }
 363
 364         /**
 365          * Add a new "<meta>" tag
 366          * To add an http-equiv meta tag, precede the name with "http:"
 367          *
 368          * @param string $name Tag name
 369          * @param string $val Tag value
 370          */
 371         function addMeta( $name, $val ) {
 372                 array_push( $this->mMetatags, array( $name, $val ) );
 373         }
 374
 375         /**
 376          * Returns the current <meta> tags
 377          *
 378          * @since 1.25
 379          * @return array
 380          */
 381         public function getMetaTags() {
 382                 return $this->mMetatags;
 383         }
 384
 385         /**
 386          * Add a new \<link\> tag to the page header.
 387          *
 388          * Note: use setCanonicalUrl() for rel=canonical.
 389          *
 390          * @param array $linkarr Associative array of attributes.
 391          */
 392         function addLink( array $linkarr ) {
 393                 array_push( $this->mLinktags, $linkarr );
 394         }
 395
 396         /**
 397          * Returns the current <link> tags
 398          *
 399          * @since 1.25
 400          * @return array
 401          */
 402         public function getLinkTags() {
 403                 return $this->mLinktags;
 404         }
 405
 406         /**
 407          * Add a new \<link\> with "rel" attribute set to "meta"
 408          *
 409          * @param array $linkarr Associative array mapping attribute names to their
 410          *                 values, both keys and values will be escaped, and the
 411          *                 "rel" attribute will be automatically added
 412          */
 413         function addMetadataLink( array $linkarr ) {
 414                 $linkarr['rel'] = $this->getMetadataAttribute();
 415                 $this->addLink( $linkarr );
 416         }
 417
 418         /**
 419          * Set the URL to be used for the <link rel=canonical>. This should be used
 420          * in preference to addLink(), to avoid duplicate link tags.
 421          * @param string $url
 422          */
 423         function setCanonicalUrl( $url ) {
 424                 $this->mCanonicalUrl = $url;
 425         }
 426
 427         /**
 428          * Returns the URL to be used for the <link rel=canonical> if
 429          * one is set.
 430          *
 431          * @since 1.25
 432          * @return bool|string
 433          */
 434         public function getCanonicalUrl() {
 435                 return $this->mCanonicalUrl;
 436         }
 437
 438         /**
 439          * Get the value of the "rel" attribute for metadata links
 440          *
 441          * @return string
 442          */
 443         public function getMetadataAttribute() {
 444                 # note: buggy CC software only reads first "meta" link
 445                 static $haveMeta = false;
 446                 if ( $haveMeta ) {
 447                         return 'alternate meta';
 448                 } else {
 449                         $haveMeta = true;
 450                         return 'meta';
 451                 }
 452         }
 453
 454         /**
 455          * Add raw HTML to the list of scripts (including \<script\> tag, etc.)
 456          * Internal use only. Use OutputPage::addModules() or OutputPage::addJsConfigVars()
 457          * if possible.
 458          *
 459          * @param string $script Raw HTML
 460          */
 461         function addScript( $script ) {
 462                 $this->mScripts .= $script . "\n";
 463         }
 464
 465         /**
 466          * Register and add a stylesheet from an extension directory.
 467          *
 468          * @deprecated since 1.27 use addModuleStyles() or addStyle() instead
 469          * @param string $url Path to sheet.  Provide either a full url (beginning
 470          *             with 'http', etc) or a relative path from the document root
 471          *             (beginning with '/').  Otherwise it behaves identically to
 472          *             addStyle() and draws from the /skins folder.
 473          */
 474         public function addExtensionStyle( $url ) {
 475                 wfDeprecated( __METHOD__, '1.27' );
 476                 array_push( $this->mExtStyles, $url );
 477         }
 478
 479         /**
 480          * Get all styles added by extensions
 481          *
 482          * @deprecated since 1.27
 483          * @return array
 484          */
 485         function getExtStyle() {
 486                 wfDeprecated( __METHOD__, '1.27' );
 487                 return $this->mExtStyles;
 488         }
 489
 490         /**
 491          * Add a JavaScript file out of skins/common, or a given relative path.
 492          * Internal use only. Use OutputPage::addModules() if possible.
 493          *
 494          * @param string $file Filename in skins/common or complete on-server path
 495          *              (/foo/bar.js)
 496          * @param string $version Style version of the file. Defaults to $wgStyleVersion
 497          */
 498         public function addScriptFile( $file, $version = null ) {
 499                 // See if $file parameter is an absolute URL or begins with a slash
 500                 if ( substr( $file, 0, 1 ) == '/' || preg_match( '#^[a-z]*://#i', $file ) ) {
 501                         $path = $file;
 502                 } else {
 503                         $path = $this->getConfig()->get( 'StylePath' ) . "/common/{$file}";
 504                 }
 505                 if ( is_null( $version ) ) {
 506                         $version = $this->getConfig()->get( 'StyleVersion' );
 507                 }
 508                 $this->addScript( Html::linkedScript( wfAppendQuery( $path, $version ) ) );
 509         }
 510
 511         /**
 512          * Add a self-contained script tag with the given contents
 513          * Internal use only. Use OutputPage::addModules() if possible.
 514          *
 515          * @param string $script JavaScript text, no "<script>" tags
 516          */
 517         public function addInlineScript( $script ) {
 518                 $this->mScripts .= Html::inlineScript( "\n$script\n" ) . "\n";
 519         }
 520
 521         /**
 522          * Get all registered JS and CSS tags for the header.
 523          *
 524          * @return string
 525          * @deprecated since 1.24 Use OutputPage::headElement to build the full header.
 526          */
 527         function getScript() {
 528                 wfDeprecated( __METHOD__, '1.24' );
 529                 return $this->mScripts . $this->getHeadItems();
 530         }
 531
 532         /**
 533          * Filter an array of modules to remove insufficiently trustworthy members, and modules
 534          * which are no longer registered (eg a page is cached before an extension is disabled)
 535          * @param array $modules
 536          * @param string|null $position If not null, only return modules with this position
 537          * @param string $type
 538          * @return array
 539          */
 540         protected function filterModules( array $modules, $position = null,
 541                 $type = ResourceLoaderModule::TYPE_COMBINED
 542         ) {
 543                 $resourceLoader = $this->getResourceLoader();
 544                 $filteredModules = array();
 545                 foreach ( $modules as $val ) {
 546                         $module = $resourceLoader->getModule( $val );
 547                         if ( $module instanceof ResourceLoaderModule
 548                                 && $module->getOrigin() <= $this->getAllowedModules( $type )
 549                                 && ( is_null( $position ) || $module->getPosition() == $position )
 550                                 && ( !$this->mTarget || in_array( $this->mTarget, $module->getTargets() ) )
 551                         ) {
 552                                 $filteredModules[] = $val;
 553                         }
 554                 }
 555                 return $filteredModules;
 556         }
 557
 558         /**
 559          * Get the list of modules to include on this page
 560          *
 561          * @param bool $filter Whether to filter out insufficiently trustworthy modules
 562          * @param string|null $position If not null, only return modules with this position
 563          * @param string $param
 564          * @return array Array of module names
 565          */
 566         public function getModules( $filter = false, $position = null, $param = 'mModules' ) {
 567                 $modules = array_values( array_unique( $this->$param ) );
 568                 return $filter
 569                         ? $this->filterModules( $modules, $position )
 570                         : $modules;
 571         }
 572
 573         /**
 574          * Add one or more modules recognized by ResourceLoader. Modules added
 575          * through this function will be loaded by ResourceLoader when the
 576          * page loads.
 577          *
 578          * @param string|array $modules Module name (string) or array of module names
 579          */
 580         public function addModules( $modules ) {
 581                 $this->mModules = array_merge( $this->mModules, (array)$modules );
 582         }
 583
 584         /**
 585          * Get the list of module JS to include on this page
 586          *
 587          * @param bool $filter
 588          * @param string|null $position
 589          *
 590          * @return array Array of module names
 591          */
 592         public function getModuleScripts( $filter = false, $position = null ) {
 593                 return $this->getModules( $filter, $position, 'mModuleScripts' );
 594         }
 595
 596         /**
 597          * Add only JS of one or more modules recognized by ResourceLoader. Module
 598          * scripts added through this function will be loaded by ResourceLoader when
 599          * the page loads.
 600          *
 601          * @param string|array $modules Module name (string) or array of module names
 602          */
 603         public function addModuleScripts( $modules ) {
 604                 $this->mModuleScripts = array_merge( $this->mModuleScripts, (array)$modules );
 605         }
 606
 607         /**
 608          * Get the list of module CSS to include on this page
 609          *
 610          * @param bool $filter
 611          * @param string|null $position
 612          *
 613          * @return array Array of module names
 614          */
 615         public function getModuleStyles( $filter = false, $position = null ) {
 616                 return $this->getModules( $filter, $position, 'mModuleStyles' );
 617         }
 618
 619         /**
 620          * Add only CSS of one or more modules recognized by ResourceLoader.
 621          *
 622          * Module styles added through this function will be added using standard link CSS
 623          * tags, rather than as a combined Javascript and CSS package. Thus, they will
 624          * load when JavaScript is disabled (unless CSS also happens to be disabled).
 625          *
 626          * @param string|array $modules Module name (string) or array of module names
 627          */
 628         public function addModuleStyles( $modules ) {
 629                 $this->mModuleStyles = array_merge( $this->mModuleStyles, (array)$modules );
 630         }
 631
 632         /**
 633          * Get the list of module messages to include on this page
 634          *
 635          * @deprecated since 1.26 Obsolete
 636          * @param bool $filter
 637          * @param string|null $position
 638          * @return array Array of module names
 639          */
 640         public function getModuleMessages( $filter = false, $position = null ) {
 641                 wfDeprecated( __METHOD__, '1.26' );
 642                 return array();
 643         }
 644
 645         /**
 646          * Load messages of one or more ResourceLoader modules.
 647          *
 648          * @deprecated since 1.26 Use addModules() instead
 649          * @param string|array $modules Module name (string) or array of module names
 650          */
 651         public function addModuleMessages( $modules ) {
 652                 wfDeprecated( __METHOD__, '1.26' );
 653         }
 654
 655         /**
 656          * @return null|string ResourceLoader target
 657          */
 658         public function getTarget() {
 659                 return $this->mTarget;
 660         }
 661
 662         /**
 663          * Sets ResourceLoader target for load.php links. If null, will be omitted
 664          *
 665          * @param string|null $target
 666          */
 667         public function setTarget( $target ) {
 668                 $this->mTarget = $target;
 669         }
 670
 671         /**
 672          * Get an array of head items
 673          *
 674          * @return array
 675          */
 676         function getHeadItemsArray() {
 677                 return $this->mHeadItems;
 678         }
 679
 680         /**
 681          * Get all header items in a string
 682          *
 683          * @return string
 684          * @deprecated since 1.24 Use OutputPage::headElement or
 685          *   if absolutely necessary use OutputPage::getHeadItemsArray
 686          */
 687         function getHeadItems() {
 688                 wfDeprecated( __METHOD__, '1.24' );
 689                 $s = '';
 690                 foreach ( $this->mHeadItems as $item ) {
 691                         $s .= $item;
 692                 }
 693                 return $s;
 694         }
 695
 696         /**
 697          * Add or replace an header item to the output
 698          *
 699          * Whenever possible, use more specific options like ResourceLoader modules,
 700          * OutputPage::addLink(), OutputPage::addMetaLink() and OutputPage::addFeedLink()
 701          * Fallback options for those are: OutputPage::addStyle, OutputPage::addScript(),
 702          * OutputPage::addInlineScript() and OutputPage::addInlineStyle()
 703          * This would be your very LAST fallback.
 704          *
 705          * @param string $name Item name
 706          * @param string $value Raw HTML
 707          */
 708         public function addHeadItem( $name, $value ) {
 709                 $this->mHeadItems[$name] = $value;
 710         }
 711
 712         /**
 713          * Check if the header item $name is already set
 714          *
 715          * @param string $name Item name
 716          * @return bool
 717          */
 718         public function hasHeadItem( $name ) {
 719                 return isset( $this->mHeadItems[$name] );
 720         }
 721
 722         /**
 723          * Set the value of the ETag HTTP header, only used if $wgUseETag is true
 724          *
 725          * @param string $tag Value of "ETag" header
 726          */
 727         function setETag( $tag ) {
 728                 $this->mETag = $tag;
 729         }
 730
 731         /**
 732          * Set whether the output should only contain the body of the article,
 733          * without any skin, sidebar, etc.
 734          * Used e.g. when calling with "action=render".
 735          *
 736          * @param bool $only Whether to output only the body of the article
 737          */
 738         public function setArticleBodyOnly( $only ) {
 739                 $this->mArticleBodyOnly = $only;
 740         }
 741
 742         /**
 743          * Return whether the output will contain only the body of the article
 744          *
 745          * @return bool
 746          */
 747         public function getArticleBodyOnly() {
 748                 return $this->mArticleBodyOnly;
 749         }
 750
 751         /**
 752          * Set an additional output property
 753          * @since 1.21
 754          *
 755          * @param string $name
 756          * @param mixed $value
 757          */
 758         public function setProperty( $name, $value ) {
 759                 $this->mProperties[$name] = $value;
 760         }
 761
 762         /**
 763          * Get an additional output property
 764          * @since 1.21
 765          *
 766          * @param string $name
 767          * @return mixed Property value or null if not found
 768          */
 769         public function getProperty( $name ) {
 770                 if ( isset( $this->mProperties[$name] ) ) {
 771                         return $this->mProperties[$name];
 772                 } else {
 773                         return null;
 774                 }
 775         }
 776
 777         /**
 778          * checkLastModified tells the client to use the client-cached page if
 779          * possible. If successful, the OutputPage is disabled so that
 780          * any future call to OutputPage->output() have no effect.
 781          *
 782          * Side effect: sets mLastModified for Last-Modified header
 783          *
 784          * @param string $timestamp
 785          *
 786          * @return bool True if cache-ok headers was sent.
 787          */
 788         public function checkLastModified( $timestamp ) {
 789                 if ( !$timestamp || $timestamp == '19700101000000' ) {
 790                         wfDebug( __METHOD__ . ": CACHE DISABLED, NO TIMESTAMP\n" );
 791                         return false;
 792                 }
 793                 $config = $this->getConfig();
 794                 if ( !$config->get( 'CachePages' ) ) {
 795                         wfDebug( __METHOD__ . ": CACHE DISABLED\n" );
 796                         return false;
 797                 }
 798
 799                 $timestamp = wfTimestamp( TS_MW, $timestamp );
 800                 $modifiedTimes = array(
 801                         'page' => $timestamp,
 802                         'user' => $this->getUser()->getTouched(),
 803                         'epoch' => $config->get( 'CacheEpoch' )
 804                 );
 805                 if ( $config->get( 'UseSquid' ) ) {
 806                         // bug 44570: the core page itself may not change, but resources might
 807                         $modifiedTimes['sepoch'] = wfTimestamp( TS_MW, time() - $config->get( 'SquidMaxage' ) );
 808                 }
 809                 Hooks::run( 'OutputPageCheckLastModified', array( &$modifiedTimes ) );
 810
 811                 $maxModified = max( $modifiedTimes );
 812                 $this->mLastModified = wfTimestamp( TS_RFC2822, $maxModified );
 813
 814                 $clientHeader = $this->getRequest()->getHeader( 'If-Modified-Since' );
 815                 if ( $clientHeader === false ) {
 816                         wfDebug( __METHOD__ . ": client did not send If-Modified-Since header", 'private' );
 817                         return false;
 818                 }
 819
 820                 # IE sends sizes after the date like this:
 821                 # Wed, 20 Aug 2003 06:51:19 GMT; length=5202
 822                 # this breaks strtotime().
 823                 $clientHeader = preg_replace( '/;.*$/', '', $clientHeader );
 824
 825                 MediaWiki\suppressWarnings(); // E_STRICT system time bitching
 826                 $clientHeaderTime = strtotime( $clientHeader );
 827                 MediaWiki\restoreWarnings();
 828                 if ( !$clientHeaderTime ) {
 829                         wfDebug( __METHOD__
 830                                 . ": unable to parse the client's If-Modified-Since header: $clientHeader\n" );
 831                         return false;
 832                 }
 833                 $clientHeaderTime = wfTimestamp( TS_MW, $clientHeaderTime );
 834
 835                 # Make debug info
 836                 $info = '';
 837                 foreach ( $modifiedTimes as $name => $value ) {
 838                         if ( $info !== '' ) {
 839                                 $info .= ', ';
 840                         }
 841                         $info .= "$name=" . wfTimestamp( TS_ISO_8601, $value );
 842                 }
 843
 844                 wfDebug( __METHOD__ . ": client sent If-Modified-Since: " .
 845                         wfTimestamp( TS_ISO_8601, $clientHeaderTime ), 'private' );
 846                 wfDebug( __METHOD__ . ": effective Last-Modified: " .
 847                         wfTimestamp( TS_ISO_8601, $maxModified ), 'private' );
 848                 if ( $clientHeaderTime < $maxModified ) {
 849                         wfDebug( __METHOD__ . ": STALE, $info", 'private' );
 850                         return false;
 851                 }
 852
 853                 # Not modified
 854                 # Give a 304 Not Modified response code and disable body output
 855                 wfDebug( __METHOD__ . ": NOT MODIFIED, $info", 'private' );
 856                 ini_set( 'zlib.output_compression', 0 );
 857                 $this->getRequest()->response()->statusHeader( 304 );
 858                 $this->sendCacheControl();
 859                 $this->disable();
 860
 861                 // Don't output a compressed blob when using ob_gzhandler;
 862                 // it's technically against HTTP spec and seems to confuse
 863                 // Firefox when the response gets split over two packets.
 864                 wfClearOutputBuffers();
 865
 866                 return true;
 867         }
 868
 869         /**
 870          * Override the last modified timestamp
 871          *
 872          * @param string $timestamp New timestamp, in a format readable by
 873          *        wfTimestamp()
 874          */
 875         public function setLastModified( $timestamp ) {
 876                 $this->mLastModified = wfTimestamp( TS_RFC2822, $timestamp );
 877         }
 878
 879         /**
 880          * Set the robot policy for the page: <http://www.robotstxt.org/meta.html>
 881          *
 882          * @param string $policy The literal string to output as the contents of
 883          *   the meta tag.  Will be parsed according to the spec and output in
 884          *   standardized form.
 885          * @return null
 886          */
 887         public function setRobotPolicy( $policy ) {
 888                 $policy = Article::formatRobotPolicy( $policy );
 889
 890                 if ( isset( $policy['index'] ) ) {
 891                         $this->setIndexPolicy( $policy['index'] );
 892                 }
 893                 if ( isset( $policy['follow'] ) ) {
 894                         $this->setFollowPolicy( $policy['follow'] );
 895                 }
 896         }
 897
 898         /**
 899          * Set the index policy for the page, but leave the follow policy un-
 900          * touched.
 901          *
 902          * @param string $policy Either 'index' or 'noindex'.
 903          * @return null
 904          */
 905         public function setIndexPolicy( $policy ) {
 906                 $policy = trim( $policy );
 907                 if ( in_array( $policy, array( 'index', 'noindex' ) ) ) {
 908                         $this->mIndexPolicy = $policy;
 909                 }
 910         }
 911
 912         /**
 913          * Set the follow policy for the page, but leave the index policy un-
 914          * touched.
 915          *
 916          * @param string $policy Either 'follow' or 'nofollow'.
 917          * @return null
 918          */
 919         public function setFollowPolicy( $policy ) {
 920                 $policy = trim( $policy );
 921                 if ( in_array( $policy, array( 'follow', 'nofollow' ) ) ) {
 922                         $this->mFollowPolicy = $policy;
 923                 }
 924         }
 925
 926         /**
 927          * Set the new value of the "action text", this will be added to the
 928          * "HTML title", separated from it with " - ".
 929          *
 930          * @param string $text New value of the "action text"
 931          */
 932         public function setPageTitleActionText( $text ) {
 933                 $this->mPageTitleActionText = $text;
 934         }
 935
 936         /**
 937          * Get the value of the "action text"
 938          *
 939          * @return string
 940          */
 941         public function getPageTitleActionText() {
 942                 return $this->mPageTitleActionText;
 943         }
 944
 945         /**
 946          * "HTML title" means the contents of "<title>".
 947          * It is stored as plain, unescaped text and will be run through htmlspecialchars in the skin file.
 948          *
 949          * @param string|Message $name
 950          */
 951         public function setHTMLTitle( $name ) {
 952                 if ( $name instanceof Message ) {
 953                         $this->mHTMLtitle = $name->setContext( $this->getContext() )->text();
 954                 } else {
 955                         $this->mHTMLtitle = $name;
 956                 }
 957         }
 958
 959         /**
 960          * Return the "HTML title", i.e. the content of the "<title>" tag.
 961          *
 962          * @return string
 963          */
 964         public function getHTMLTitle() {
 965                 return $this->mHTMLtitle;
 966         }
 967
 968         /**
 969          * Set $mRedirectedFrom, the Title of the page which redirected us to the current page.
 970          *
 971          * @param Title $t
 972          */
 973         public function setRedirectedFrom( $t ) {
 974                 $this->mRedirectedFrom = $t;
 975         }
 976
 977         /**
 978          * "Page title" means the contents of \<h1\>. It is stored as a valid HTML
 979          * fragment. This function allows good tags like \<sup\> in the \<h1\> tag,
 980          * but not bad tags like \<script\>. This function automatically sets
 981          * \<title\> to the same content as \<h1\> but with all tags removed. Bad
 982          * tags that were escaped in \<h1\> will still be escaped in \<title\>, and
 983          * good tags like \<i\> will be dropped entirely.
 984          *
 985          * @param string|Message $name
 986          */
 987         public function setPageTitle( $name ) {
 988                 if ( $name instanceof Message ) {
 989                         $name = $name->setContext( $this->getContext() )->text();
 990                 }
 991
 992                 # change "<script>foo&bar</script>" to "&lt;script&gt;foo&amp;bar&lt;/script&gt;"
 993                 # but leave "<i>foobar</i>" alone
 994                 $nameWithTags = Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags( $name ) );
 995                 $this->mPagetitle = $nameWithTags;
 996
 997                 # change "<i>foo&amp;bar</i>" to "foo&bar"
 998                 $this->setHTMLTitle(
 999                         $this->msg( 'pagetitle' )->rawParams( Sanitizer::stripAllTags( $nameWithTags ) )
1000                                 ->inContentLanguage()
1001                 );
1002         }
1003
1004         /**
1005          * Return the "page title", i.e. the content of the \<h1\> tag.
1006          *
1007          * @return string
1008          */
1009         public function getPageTitle() {
1010                 return $this->mPagetitle;
1011         }
1012
1013         /**
1014          * Set the Title object to use
1015          *
1016          * @param Title $t
1017          */
1018         public function setTitle( Title $t ) {
1019                 $this->getContext()->setTitle( $t );
1020         }
1021
1022         /**
1023          * Replace the subtitle with $str
1024          *
1025          * @param string|Message $str New value of the subtitle. String should be safe HTML.
1026          */
1027         public function setSubtitle( $str ) {
1028                 $this->clearSubtitle();
1029                 $this->addSubtitle( $str );
1030         }
1031
1032         /**
1033          * Add $str to the subtitle
1034          *
1035          * @param string|Message $str String or Message to add to the subtitle. String should be safe HTML.
1036          */
1037         public function addSubtitle( $str ) {
1038                 if ( $str instanceof Message ) {
1039                         $this->mSubtitle[] = $str->setContext( $this->getContext() )->parse();
1040                 } else {
1041                         $this->mSubtitle[] = $str;
1042                 }
1043         }
1044
1045         /**
1046          * Build message object for a subtitle containing a backlink to a page
1047          *
1048          * @param Title $title Title to link to
1049          * @param array $query Array of additional parameters to include in the link
1050          * @return Message
1051          * @since 1.25
1052          */
1053         public static function buildBacklinkSubtitle( Title $title, $query = array() ) {
1054                 if ( $title->isRedirect() ) {
1055                         $query['redirect'] = 'no';
1056                 }
1057                 return wfMessage( 'backlinksubtitle' )
1058                         ->rawParams( Linker::link( $title, null, array(), $query ) );
1059         }
1060
1061         /**
1062          * Add a subtitle containing a backlink to a page
1063          *
1064          * @param Title $title Title to link to
1065          * @param array $query Array of additional parameters to include in the link
1066          */
1067         public function addBacklinkSubtitle( Title $title, $query = array() ) {
1068                 $this->addSubtitle( self::buildBacklinkSubtitle( $title, $query ) );
1069         }
1070
1071         /**
1072          * Clear the subtitles
1073          */
1074         public function clearSubtitle() {
1075                 $this->mSubtitle = array();
1076         }
1077
1078         /**
1079          * Get the subtitle
1080          *
1081          * @return string
1082          */
1083         public function getSubtitle() {
1084                 return implode( "<br />\n\t\t\t\t", $this->mSubtitle );
1085         }
1086
1087         /**
1088          * Set the page as printable, i.e. it'll be displayed with all
1089          * print styles included
1090          */
1091         public function setPrintable() {
1092                 $this->mPrintable = true;
1093         }
1094
1095         /**
1096          * Return whether the page is "printable"
1097          *
1098          * @return bool
1099          */
1100         public function isPrintable() {
1101                 return $this->mPrintable;
1102         }
1103
1104         /**
1105          * Disable output completely, i.e. calling output() will have no effect
1106          */
1107         public function disable() {
1108                 $this->mDoNothing = true;
1109         }
1110
1111         /**
1112          * Return whether the output will be completely disabled
1113          *
1114          * @return bool
1115          */
1116         public function isDisabled() {
1117                 return $this->mDoNothing;
1118         }
1119
1120         /**
1121          * Show an "add new section" link?
1122          *
1123          * @return bool
1124          */
1125         public function showNewSectionLink() {
1126                 return $this->mNewSectionLink;
1127         }
1128
1129         /**
1130          * Forcibly hide the new section link?
1131          *
1132          * @return bool
1133          */
1134         public function forceHideNewSectionLink() {
1135                 return $this->mHideNewSectionLink;
1136         }
1137
1138         /**
1139          * Add or remove feed links in the page header
1140          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
1141          * for the new version
1142          * @see addFeedLink()
1143          *
1144          * @param bool $show True: add default feeds, false: remove all feeds
1145          */
1146         public function setSyndicated( $show = true ) {
1147                 if ( $show ) {
1148                         $this->setFeedAppendQuery( false );
1149                 } else {
1150                         $this->mFeedLinks = array();
1151                 }
1152         }
1153
1154         /**
1155          * Add default feeds to the page header
1156          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
1157          * for the new version
1158          * @see addFeedLink()
1159          *
1160          * @param string $val Query to append to feed links or false to output
1161          *        default links
1162          */
1163         public function setFeedAppendQuery( $val ) {
1164                 $this->mFeedLinks = array();
1165
1166                 foreach ( $this->getConfig()->get( 'AdvertisedFeedTypes' ) as $type ) {
1167                         $query = "feed=$type";
1168                         if ( is_string( $val ) ) {
1169                                 $query .= '&' . $val;
1170                         }
1171                         $this->mFeedLinks[$type] = $this->getTitle()->getLocalURL( $query );
1172                 }
1173         }
1174
1175         /**
1176          * Add a feed link to the page header
1177          *
1178          * @param string $format Feed type, should be a key of $wgFeedClasses
1179          * @param string $href URL
1180          */
1181         public function addFeedLink( $format, $href ) {
1182                 if ( in_array( $format, $this->getConfig()->get( 'AdvertisedFeedTypes' ) ) ) {
1183                         $this->mFeedLinks[$format] = $href;
1184                 }
1185         }
1186
1187         /**
1188          * Should we output feed links for this page?
1189          * @return bool
1190          */
1191         public function isSyndicated() {
1192                 return count( $this->mFeedLinks ) > 0;
1193         }
1194
1195         /**
1196          * Return URLs for each supported syndication format for this page.
1197          * @return array Associating format keys with URLs
1198          */
1199         public function getSyndicationLinks() {
1200                 return $this->mFeedLinks;
1201         }
1202
1203         /**
1204          * Will currently always return null
1205          *
1206          * @return null
1207          */
1208         public function getFeedAppendQuery() {
1209                 return $this->mFeedLinksAppendQuery;
1210         }
1211
1212         /**
1213          * Set whether the displayed content is related to the source of the
1214          * corresponding article on the wiki
1215          * Setting true will cause the change "article related" toggle to true
1216          *
1217          * @param bool $v
1218          */
1219         public function setArticleFlag( $v ) {
1220                 $this->mIsarticle = $v;
1221                 if ( $v ) {
1222                         $this->mIsArticleRelated = $v;
1223                 }
1224         }
1225
1226         /**
1227          * Return whether the content displayed page is related to the source of
1228          * the corresponding article on the wiki
1229          *
1230          * @return bool
1231          */
1232         public function isArticle() {
1233                 return $this->mIsarticle;
1234         }
1235
1236         /**
1237          * Set whether this page is related an article on the wiki
1238          * Setting false will cause the change of "article flag" toggle to false
1239          *
1240          * @param bool $v
1241          */
1242         public function setArticleRelated( $v ) {
1243                 $this->mIsArticleRelated = $v;
1244                 if ( !$v ) {
1245                         $this->mIsarticle = false;
1246                 }
1247         }
1248
1249         /**
1250          * Return whether this page is related an article on the wiki
1251          *
1252          * @return bool
1253          */
1254         public function isArticleRelated() {
1255                 return $this->mIsArticleRelated;
1256         }
1257
1258         /**
1259          * Add new language links
1260          *
1261          * @param array $newLinkArray Associative array mapping language code to the page
1262          *                      name
1263          */
1264         public function addLanguageLinks( array $newLinkArray ) {
1265                 $this->mLanguageLinks += $newLinkArray;
1266         }
1267
1268         /**
1269          * Reset the language links and add new language links
1270          *
1271          * @param array $newLinkArray Associative array mapping language code to the page
1272          *                      name
1273          */
1274         public function setLanguageLinks( array $newLinkArray ) {
1275                 $this->mLanguageLinks = $newLinkArray;
1276         }
1277
1278         /**
1279          * Get the list of language links
1280          *
1281          * @return array Array of Interwiki Prefixed (non DB key) Titles (e.g. 'fr:Test page')
1282          */
1283         public function getLanguageLinks() {
1284                 return $this->mLanguageLinks;
1285         }
1286
1287         /**
1288          * Add an array of categories, with names in the keys
1289          *
1290          * @param array $categories Mapping category name => sort key
1291          */
1292         public function addCategoryLinks( array $categories ) {
1293                 global $wgContLang;
1294
1295                 if ( !is_array( $categories ) || count( $categories ) == 0 ) {
1296                         return;
1297                 }
1298
1299                 # Add the links to a LinkBatch
1300                 $arr = array( NS_CATEGORY => $categories );
1301                 $lb = new LinkBatch;
1302                 $lb->setArray( $arr );
1303
1304                 # Fetch existence plus the hiddencat property
1305                 $dbr = wfGetDB( DB_SLAVE );
1306                 $fields = array( 'page_id', 'page_namespace', 'page_title', 'page_len',
1307                         'page_is_redirect', 'page_latest', 'pp_value' );
1308
1309                 if ( $this->getConfig()->get( 'ContentHandlerUseDB' ) ) {
1310                         $fields[] = 'page_content_model';
1311                 }
1312
1313                 $res = $dbr->select( array( 'page', 'page_props' ),
1314                         $fields,
1315                         $lb->constructSet( 'page', $dbr ),
1316                         __METHOD__,
1317                         array(),
1318                         array( 'page_props' => array( 'LEFT JOIN', array(
1319                                 'pp_propname' => 'hiddencat',
1320                                 'pp_page = page_id'
1321                         ) ) )
1322                 );
1323
1324                 # Add the results to the link cache
1325                 $lb->addResultToCache( LinkCache::singleton(), $res );
1326
1327                 # Set all the values to 'normal'.
1328                 $categories = array_fill_keys( array_keys( $categories ), 'normal' );
1329
1330                 # Mark hidden categories
1331                 foreach ( $res as $row ) {
1332                         if ( isset( $row->pp_value ) ) {
1333                                 $categories[$row->page_title] = 'hidden';
1334                         }
1335                 }
1336
1337                 # Add the remaining categories to the skin
1338                 if ( Hooks::run(
1339                         'OutputPageMakeCategoryLinks',
1340                         array( &$this, $categories, &$this->mCategoryLinks ) )
1341                 ) {
1342                         foreach ( $categories as $category => $type ) {
1343                                 // array keys will cast numeric category names to ints, so cast back to string
1344                                 $category = (string)$category;
1345                                 $origcategory = $category;
1346                                 $title = Title::makeTitleSafe( NS_CATEGORY, $category );
1347                                 if ( !$title ) {
1348                                         continue;
1349                                 }
1350                                 $wgContLang->findVariantLink( $category, $title, true );
1351                                 if ( $category != $origcategory && array_key_exists( $category, $categories ) ) {
1352                                         continue;
1353                                 }
1354                                 $text = $wgContLang->convertHtml( $title->getText() );
1355                                 $this->mCategories[] = $title->getText();
1356                                 $this->mCategoryLinks[$type][] = Linker::link( $title, $text );
1357                         }
1358                 }
1359         }
1360
1361         /**
1362          * Reset the category links (but not the category list) and add $categories
1363          *
1364          * @param array $categories Mapping category name => sort key
1365          */
1366         public function setCategoryLinks( array $categories ) {
1367                 $this->mCategoryLinks = array();
1368                 $this->addCategoryLinks( $categories );
1369         }
1370
1371         /**
1372          * Get the list of category links, in a 2-D array with the following format:
1373          * $arr[$type][] = $link, where $type is either "normal" or "hidden" (for
1374          * hidden categories) and $link a HTML fragment with a link to the category
1375          * page
1376          *
1377          * @return array
1378          */
1379         public function getCategoryLinks() {
1380                 return $this->mCategoryLinks;
1381         }
1382
1383         /**
1384          * Get the list of category names this page belongs to
1385          *
1386          * @return array Array of strings
1387          */
1388         public function getCategories() {
1389                 return $this->mCategories;
1390         }
1391
1392         /**
1393          * Add an array of indicators, with their identifiers as array
1394          * keys and HTML contents as values.
1395          *
1396          * In case of duplicate keys, existing values are overwritten.
1397          *
1398          * @param array $indicators
1399          * @since 1.25
1400          */
1401         public function setIndicators( array $indicators ) {
1402                 $this->mIndicators = $indicators + $this->mIndicators;
1403                 // Keep ordered by key
1404                 ksort( $this->mIndicators );
1405         }
1406
1407         /**
1408          * Get the indicators associated with this page.
1409          *
1410          * The array will be internally ordered by item keys.
1411          *
1412          * @return array Keys: identifiers, values: HTML contents
1413          * @since 1.25
1414          */
1415         public function getIndicators() {
1416                 return $this->mIndicators;
1417         }
1418
1419         /**
1420          * Adds help link with an icon via page indicators.
1421          * Link target can be overridden by a local message containing a wikilink:
1422          * the message key is: lowercase action or special page name + '-helppage'.
1423          * @param string $to Target MediaWiki.org page title or encoded URL.
1424          * @param bool $overrideBaseUrl Whether $url is a full URL, to avoid MW.o.
1425          * @since 1.25
1426          */
1427         public function addHelpLink( $to, $overrideBaseUrl = false ) {
1428                 $this->addModuleStyles( 'mediawiki.helplink' );
1429                 $text = $this->msg( 'helppage-top-gethelp' )->escaped();
1430
1431                 if ( $overrideBaseUrl ) {
1432                         $helpUrl = $to;
1433                 } else {
1434                         $toUrlencoded = wfUrlencode( str_replace( ' ', '_', $to ) );
1435                         $helpUrl = "//www.mediawiki.org/wiki/Special:MyLanguage/$toUrlencoded";
1436                 }
1437
1438                 $link = Html::rawElement(
1439                         'a',
1440                         array(
1441                                 'href' => $helpUrl,
1442                                 'target' => '_blank',
1443                                 'class' => 'mw-helplink',
1444                         ),
1445                         $text
1446                 );
1447
1448                 $this->setIndicators( array( 'mw-helplink' => $link ) );
1449         }
1450
1451         /**
1452          * Do not allow scripts which can be modified by wiki users to load on this page;
1453          * only allow scripts bundled with, or generated by, the software.
1454          * Site-wide styles are controlled by a config setting, since they can be
1455          * used to create a custom skin/theme, but not user-specific ones.
1456          *
1457          * @todo this should be given a more accurate name
1458          */
1459         public function disallowUserJs() {
1460                 $this->reduceAllowedModules(
1461                         ResourceLoaderModule::TYPE_SCRIPTS,
1462                         ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL
1463                 );
1464
1465                 // Site-wide styles are controlled by a config setting, see bug 71621
1466                 // for background on why. User styles are never allowed.
1467                 if ( $this->getConfig()->get( 'AllowSiteCSSOnRestrictedPages' ) ) {
1468                         $styleOrigin = ResourceLoaderModule::ORIGIN_USER_SITEWIDE;
1469                 } else {
1470                         $styleOrigin = ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL;
1471                 }
1472                 $this->reduceAllowedModules(
1473                         ResourceLoaderModule::TYPE_STYLES,
1474                         $styleOrigin
1475                 );
1476         }
1477
1478         /**
1479          * Show what level of JavaScript / CSS untrustworthiness is allowed on this page
1480          * @see ResourceLoaderModule::$origin
1481          * @param string $type ResourceLoaderModule TYPE_ constant
1482          * @return int ResourceLoaderModule ORIGIN_ class constant
1483          */
1484         public function getAllowedModules( $type ) {
1485                 if ( $type == ResourceLoaderModule::TYPE_COMBINED ) {
1486                         return min( array_values( $this->mAllowedModules ) );
1487                 } else {
1488                         return isset( $this->mAllowedModules[$type] )
1489                                 ? $this->mAllowedModules[$type]
1490                                 : ResourceLoaderModule::ORIGIN_ALL;
1491                 }
1492         }
1493
1494         /**
1495          * Set the highest level of CSS/JS untrustworthiness allowed
1496          *
1497          * @deprecated since 1.24 Raising level of allowed untrusted content is no longer supported.
1498          *  Use reduceAllowedModules() instead
1499          * @param string $type ResourceLoaderModule TYPE_ constant
1500          * @param int $level ResourceLoaderModule class constant
1501          */
1502         public function setAllowedModules( $type, $level ) {
1503                 wfDeprecated( __METHOD__, '1.24' );
1504                 $this->reduceAllowedModules( $type, $level );
1505         }
1506
1507         /**
1508          * Limit the highest level of CSS/JS untrustworthiness allowed.
1509          *
1510          * If passed the same or a higher level than the current level of untrustworthiness set, the
1511          * level will remain unchanged.
1512          *
1513          * @param string $type
1514          * @param int $level ResourceLoaderModule class constant
1515          */
1516         public function reduceAllowedModules( $type, $level ) {
1517                 $this->mAllowedModules[$type] = min( $this->getAllowedModules( $type ), $level );
1518         }
1519
1520         /**
1521          * Prepend $text to the body HTML
1522          *
1523          * @param string $text HTML
1524          */
1525         public function prependHTML( $text ) {
1526                 $this->mBodytext = $text . $this->mBodytext;
1527         }
1528
1529         /**
1530          * Append $text to the body HTML
1531          *
1532          * @param string $text HTML
1533          */
1534         public function addHTML( $text ) {
1535                 $this->mBodytext .= $text;
1536         }
1537
1538         /**
1539          * Shortcut for adding an Html::element via addHTML.
1540          *
1541          * @since 1.19
1542          *
1543          * @param string $element
1544          * @param array $attribs
1545          * @param string $contents
1546          */
1547         public function addElement( $element, array $attribs = array(), $contents = '' ) {
1548                 $this->addHTML( Html::element( $element, $attribs, $contents ) );
1549         }
1550
1551         /**
1552          * Clear the body HTML
1553          */
1554         public function clearHTML() {
1555                 $this->mBodytext = '';
1556         }
1557
1558         /**
1559          * Get the body HTML
1560          *
1561          * @return string HTML
1562          */
1563         public function getHTML() {
1564                 return $this->mBodytext;
1565         }
1566
1567         /**
1568          * Get/set the ParserOptions object to use for wikitext parsing
1569          *
1570          * @param ParserOptions|null $options Either the ParserOption to use or null to only get the
1571          *   current ParserOption object
1572          * @return ParserOptions
1573          */
1574         public function parserOptions( $options = null ) {
1575                 if ( !$this->mParserOptions ) {
1576                         $this->mParserOptions = ParserOptions::newFromContext( $this->getContext() );
1577                         $this->mParserOptions->setEditSection( false );
1578                 }
1579                 return wfSetVar( $this->mParserOptions, $options );
1580         }
1581
1582         /**
1583          * Set the revision ID which will be seen by the wiki text parser
1584          * for things such as embedded {{REVISIONID}} variable use.
1585          *
1586          * @param int|null $revid An positive integer, or null
1587          * @return mixed Previous value
1588          */
1589         public function setRevisionId( $revid ) {
1590                 $val = is_null( $revid ) ? null : intval( $revid );
1591                 return wfSetVar( $this->mRevisionId, $val );
1592         }
1593
1594         /**
1595          * Get the displayed revision ID
1596          *
1597          * @return int
1598          */
1599         public function getRevisionId() {
1600                 return $this->mRevisionId;
1601         }
1602
1603         /**
1604          * Set the timestamp of the revision which will be displayed. This is used
1605          * to avoid a extra DB call in Skin::lastModified().
1606          *
1607          * @param string|null $timestamp
1608          * @return mixed Previous value
1609          */
1610         public function setRevisionTimestamp( $timestamp ) {
1611                 return wfSetVar( $this->mRevisionTimestamp, $timestamp );
1612         }
1613
1614         /**
1615          * Get the timestamp of displayed revision.
1616          * This will be null if not filled by setRevisionTimestamp().
1617          *
1618          * @return string|null
1619          */
1620         public function getRevisionTimestamp() {
1621                 return $this->mRevisionTimestamp;
1622         }
1623
1624         /**
1625          * Set the displayed file version
1626          *
1627          * @param File|bool $file
1628          * @return mixed Previous value
1629          */
1630         public function setFileVersion( $file ) {
1631                 $val = null;
1632                 if ( $file instanceof File && $file->exists() ) {
1633                         $val = array( 'time' => $file->getTimestamp(), 'sha1' => $file->getSha1() );
1634                 }
1635                 return wfSetVar( $this->mFileVersion, $val, true );
1636         }
1637
1638         /**
1639          * Get the displayed file version
1640          *
1641          * @return array|null ('time' => MW timestamp, 'sha1' => sha1)
1642          */
1643         public function getFileVersion() {
1644                 return $this->mFileVersion;
1645         }
1646
1647         /**
1648          * Get the templates used on this page
1649          *
1650          * @return array (namespace => dbKey => revId)
1651          * @since 1.18
1652          */
1653         public function getTemplateIds() {
1654                 return $this->mTemplateIds;
1655         }
1656
1657         /**
1658          * Get the files used on this page
1659          *
1660          * @return array (dbKey => array('time' => MW timestamp or null, 'sha1' => sha1 or ''))
1661          * @since 1.18
1662          */
1663         public function getFileSearchOptions() {
1664                 return $this->mImageTimeKeys;
1665         }
1666
1667         /**
1668          * Convert wikitext to HTML and add it to the buffer
1669          * Default assumes that the current page title will be used.
1670          *
1671          * @param string $text
1672          * @param bool $linestart Is this the start of a line?
1673          * @param bool $interface Is this text in the user interface language?
1674          * @throws MWException
1675          */
1676         public function addWikiText( $text, $linestart = true, $interface = true ) {
1677                 $title = $this->getTitle(); // Work around E_STRICT
1678                 if ( !$title ) {
1679                         throw new MWException( 'Title is null' );
1680                 }
1681                 $this->addWikiTextTitle( $text, $title, $linestart, /*tidy*/false, $interface );
1682         }
1683
1684         /**
1685          * Add wikitext with a custom Title object
1686          *
1687          * @param string $text Wikitext
1688          * @param Title $title
1689          * @param bool $linestart Is this the start of a line?
1690          */
1691         public function addWikiTextWithTitle( $text, &$title, $linestart = true ) {
1692                 $this->addWikiTextTitle( $text, $title, $linestart );
1693         }
1694
1695         /**
1696          * Add wikitext with a custom Title object and tidy enabled.
1697          *
1698          * @param string $text Wikitext
1699          * @param Title $title
1700          * @param bool $linestart Is this the start of a line?
1701          */
1702         function addWikiTextTitleTidy( $text, &$title, $linestart = true ) {
1703                 $this->addWikiTextTitle( $text, $title, $linestart, true );
1704         }
1705
1706         /**
1707          * Add wikitext with tidy enabled
1708          *
1709          * @param string $text Wikitext
1710          * @param bool $linestart Is this the start of a line?
1711          */
1712         public function addWikiTextTidy( $text, $linestart = true ) {
1713                 $title = $this->getTitle();
1714                 $this->addWikiTextTitleTidy( $text, $title, $linestart );
1715         }
1716
1717         /**
1718          * Add wikitext with a custom Title object
1719          *
1720          * @param string $text Wikitext
1721          * @param Title $title
1722          * @param bool $linestart Is this the start of a line?
1723          * @param bool $tidy Whether to use tidy
1724          * @param bool $interface Whether it is an interface message
1725          *   (for example disables conversion)
1726          */
1727         public function addWikiTextTitle( $text, Title $title, $linestart,
1728                 $tidy = false, $interface = false
1729         ) {
1730                 global $wgParser;
1731
1732                 $popts = $this->parserOptions();
1733                 $oldTidy = $popts->setTidy( $tidy );
1734                 $popts->setInterfaceMessage( (bool)$interface );
1735
1736                 $parserOutput = $wgParser->getFreshParser()->parse(
1737                         $text, $title, $popts,
1738                         $linestart, true, $this->mRevisionId
1739                 );
1740
1741                 $popts->setTidy( $oldTidy );
1742
1743                 $this->addParserOutput( $parserOutput );
1744
1745         }
1746
1747         /**
1748          * Add a ParserOutput object, but without Html.
1749          *
1750          * @deprecated since 1.24, use addParserOutputMetadata() instead.
1751          * @param ParserOutput $parserOutput
1752          */
1753         public function addParserOutputNoText( $parserOutput ) {
1754                 wfDeprecated( __METHOD__, '1.24' );
1755                 $this->addParserOutputMetadata( $parserOutput );
1756         }
1757
1758         /**
1759          * Add all metadata associated with a ParserOutput object, but without the actual HTML. This
1760          * includes categories, language links, ResourceLoader modules, effects of certain magic words,
1761          * and so on.
1762          *
1763          * @since 1.24
1764          * @param ParserOutput $parserOutput
1765          */
1766         public function addParserOutputMetadata( $parserOutput ) {
1767                 $this->mLanguageLinks += $parserOutput->getLanguageLinks();
1768                 $this->addCategoryLinks( $parserOutput->getCategories() );
1769                 $this->setIndicators( $parserOutput->getIndicators() );
1770                 $this->mNewSectionLink = $parserOutput->getNewSection();
1771                 $this->mHideNewSectionLink = $parserOutput->getHideNewSection();
1772
1773                 if ( !$parserOutput->isCacheable() ) {
1774                         $this->enableClientCache( false );
1775                 }
1776                 $this->mNoGallery = $parserOutput->getNoGallery();
1777                 $this->mHeadItems = array_merge( $this->mHeadItems, $parserOutput->getHeadItems() );
1778                 $this->addModules( $parserOutput->getModules() );
1779                 $this->addModuleScripts( $parserOutput->getModuleScripts() );
1780                 $this->addModuleStyles( $parserOutput->getModuleStyles() );
1781                 $this->addJsConfigVars( $parserOutput->getJsConfigVars() );
1782                 $this->mPreventClickjacking = $this->mPreventClickjacking
1783                         || $parserOutput->preventClickjacking();
1784
1785                 // Template versioning...
1786                 foreach ( (array)$parserOutput->getTemplateIds() as $ns => $dbks ) {
1787                         if ( isset( $this->mTemplateIds[$ns] ) ) {
1788                                 $this->mTemplateIds[$ns] = $dbks + $this->mTemplateIds[$ns];
1789                         } else {
1790                                 $this->mTemplateIds[$ns] = $dbks;
1791                         }
1792                 }
1793                 // File versioning...
1794                 foreach ( (array)$parserOutput->getFileSearchOptions() as $dbk => $data ) {
1795                         $this->mImageTimeKeys[$dbk] = $data;
1796                 }
1797
1798                 // Hooks registered in the object
1799                 $parserOutputHooks = $this->getConfig()->get( 'ParserOutputHooks' );
1800                 foreach ( $parserOutput->getOutputHooks() as $hookInfo ) {
1801                         list( $hookName, $data ) = $hookInfo;
1802                         if ( isset( $parserOutputHooks[$hookName] ) ) {
1803                                 call_user_func( $parserOutputHooks[$hookName], $this, $parserOutput, $data );
1804                         }
1805                 }
1806
1807                 // enable OOUI if requested via ParserOutput
1808                 if ( $parserOutput->getEnableOOUI() ) {
1809                         $this->enableOOUI();
1810                 }
1811
1812                 // Link flags are ignored for now, but may in the future be
1813                 // used to mark individual language links.
1814                 $linkFlags = array();
1815                 Hooks::run( 'LanguageLinks', array( $this->getTitle(), &$this->mLanguageLinks, &$linkFlags ) );
1816                 Hooks::run( 'OutputPageParserOutput', array( &$this, $parserOutput ) );
1817         }
1818
1819         /**
1820          * Add the HTML and enhancements for it (like ResourceLoader modules) associated with a
1821          * ParserOutput object, without any other metadata.
1822          *
1823          * @since 1.24
1824          * @param ParserOutput $parserOutput
1825          */
1826         public function addParserOutputContent( $parserOutput ) {
1827                 $this->addParserOutputText( $parserOutput );
1828
1829                 $this->addModules( $parserOutput->getModules() );
1830                 $this->addModuleScripts( $parserOutput->getModuleScripts() );
1831                 $this->addModuleStyles( $parserOutput->getModuleStyles() );
1832
1833                 $this->addJsConfigVars( $parserOutput->getJsConfigVars() );
1834         }
1835
1836         /**
1837          * Add the HTML associated with a ParserOutput object, without any metadata.
1838          *
1839          * @since 1.24
1840          * @param ParserOutput $parserOutput
1841          */
1842         public function addParserOutputText( $parserOutput ) {
1843                 $text = $parserOutput->getText();
1844                 Hooks::run( 'OutputPageBeforeHTML', array( &$this, &$text ) );
1845                 $this->addHTML( $text );
1846         }
1847
1848         /**
1849          * Add everything from a ParserOutput object.
1850          *
1851          * @param ParserOutput $parserOutput
1852          */
1853         function addParserOutput( $parserOutput ) {
1854                 $this->addParserOutputMetadata( $parserOutput );
1855                 $parserOutput->setTOCEnabled( $this->mEnableTOC );
1856
1857                 // Touch section edit links only if not previously disabled
1858                 if ( $parserOutput->getEditSectionTokens() ) {
1859                         $parserOutput->setEditSectionTokens( $this->mEnableSectionEditLinks );
1860                 }
1861
1862                 $this->addParserOutputText( $parserOutput );
1863         }
1864
1865         /**
1866          * Add the output of a QuickTemplate to the output buffer
1867          *
1868          * @param QuickTemplate $template
1869          */
1870         public function addTemplate( &$template ) {
1871                 $this->addHTML( $template->getHTML() );
1872         }
1873
1874         /**
1875          * Parse wikitext and return the HTML.
1876          *
1877          * @param string $text
1878          * @param bool $linestart Is this the start of a line?
1879          * @param bool $interface Use interface language ($wgLang instead of
1880          *   $wgContLang) while parsing language sensitive magic words like GRAMMAR and PLURAL.
1881          *   This also disables LanguageConverter.
1882          * @param Language $language Target language object, will override $interface
1883          * @throws MWException
1884          * @return string HTML
1885          */
1886         public function parse( $text, $linestart = true, $interface = false, $language = null ) {
1887                 global $wgParser;
1888
1889                 if ( is_null( $this->getTitle() ) ) {
1890                         throw new MWException( 'Empty $mTitle in ' . __METHOD__ );
1891                 }
1892
1893                 $popts = $this->parserOptions();
1894                 if ( $interface ) {
1895                         $popts->setInterfaceMessage( true );
1896                 }
1897                 if ( $language !== null ) {
1898                         $oldLang = $popts->setTargetLanguage( $language );
1899                 }
1900
1901                 $parserOutput = $wgParser->getFreshParser()->parse(
1902                         $text, $this->getTitle(), $popts,
1903                         $linestart, true, $this->mRevisionId
1904                 );
1905
1906                 if ( $interface ) {
1907                         $popts->setInterfaceMessage( false );
1908                 }
1909                 if ( $language !== null ) {
1910                         $popts->setTargetLanguage( $oldLang );
1911                 }
1912
1913                 return $parserOutput->getText();
1914         }
1915
1916         /**
1917          * Parse wikitext, strip paragraphs, and return the HTML.
1918          *
1919          * @param string $text
1920          * @param bool $linestart Is this the start of a line?
1921          * @param bool $interface Use interface language ($wgLang instead of
1922          *   $wgContLang) while parsing language sensitive magic
1923          *   words like GRAMMAR and PLURAL
1924          * @return string HTML
1925          */
1926         public function parseInline( $text, $linestart = true, $interface = false ) {
1927                 $parsed = $this->parse( $text, $linestart, $interface );
1928                 return Parser::stripOuterParagraph( $parsed );
1929         }
1930
1931         /**
1932          * @param $maxage
1933          * @deprecated since 1.27 Use setCdnMaxage() instead
1934          */
1935         public function setSquidMaxage( $maxage ) {
1936                 $this->setCdnMaxage( $maxage );
1937         }
1938
1939         /**
1940          * Set the value of the "s-maxage" part of the "Cache-control" HTTP header
1941          *
1942          * @param int $maxage Maximum cache time on the CDN, in seconds.
1943          */
1944         public function setCdnMaxage( $maxage ) {
1945                 $this->mCdnMaxage = min( $maxage, $this->mCdnMaxageLimit );
1946         }
1947
1948         /**
1949          * Lower the value of the "s-maxage" part of the "Cache-control" HTTP header
1950          *
1951          * @param int $maxage Maximum cache time on the CDN, in seconds
1952          * @since 1.27
1953          */
1954         public function lowerCdnMaxage( $maxage ) {
1955                 $this->mCdnMaxageLimit = min( $maxage, $this->mCdnMaxageLimit );
1956                 $this->setCdnMaxage( $this->mCdnMaxage );
1957         }
1958
1959         /**
1960          * Use enableClientCache(false) to force it to send nocache headers
1961          *
1962          * @param bool $state
1963          *
1964          * @return bool
1965          */
1966         public function enableClientCache( $state ) {
1967                 return wfSetVar( $this->mEnableClientCache, $state );
1968         }
1969
1970         /**
1971          * Get the list of cookies that will influence on the cache
1972          *
1973          * @return array
1974          */
1975         function getCacheVaryCookies() {
1976                 static $cookies;
1977                 if ( $cookies === null ) {
1978                         $config = $this->getConfig();
1979                         $cookies = array_merge(
1980                                 array(
1981                                         $config->get( 'CookiePrefix' ) . 'Token',
1982                                         $config->get( 'CookiePrefix' ) . 'LoggedOut',
1983                                         "forceHTTPS",
1984                                         session_name()
1985                                 ),
1986                                 $config->get( 'CacheVaryCookies' )
1987                         );
1988                         Hooks::run( 'GetCacheVaryCookies', array( $this, &$cookies ) );
1989                 }
1990                 return $cookies;
1991         }
1992
1993         /**
1994          * Check if the request has a cache-varying cookie header
1995          * If it does, it's very important that we don't allow public caching
1996          *
1997          * @return bool
1998          */
1999         function haveCacheVaryCookies() {
2000                 $request = $this->getRequest();
2001                 foreach ( $this->getCacheVaryCookies() as $cookieName ) {
2002                         if ( $request->getCookie( $cookieName, '', '' ) !== '' ) {
2003                                 wfDebug( __METHOD__ . ": found $cookieName\n" );
2004                                 return true;
2005                         }
2006                 }
2007                 wfDebug( __METHOD__ . ": no cache-varying cookies found\n" );
2008                 return false;
2009         }
2010
2011         /**
2012          * Add an HTTP header that will influence on the cache
2013          *
2014          * @param string $header Header name
2015          * @param string[]|null $option Options for the Key header. See
2016          * https://datatracker.ietf.org/doc/draft-fielding-http-key/
2017          * for the list of valid options.
2018          */
2019         public function addVaryHeader( $header, array $option = null ) {
2020                 if ( !array_key_exists( $header, $this->mVaryHeader ) ) {
2021                         $this->mVaryHeader[$header] = array();
2022                 }
2023                 if ( !is_array( $option ) ) {
2024                         $option = array();
2025                 }
2026                 $this->mVaryHeader[$header] = array_unique( array_merge( $this->mVaryHeader[$header], $option ) );
2027         }
2028
2029         /**
2030          * Return a Vary: header on which to vary caches. Based on the keys of $mVaryHeader,
2031          * such as Accept-Encoding or Cookie
2032          *
2033          * @return string
2034          */
2035         public function getVaryHeader() {
2036                 return 'Vary: ' . join( ', ', array_keys( $this->mVaryHeader ) );
2037         }
2038
2039         /**
2040          * Get a complete Key header
2041          *
2042          * @return string
2043          */
2044         public function getKeyHeader() {
2045                 $cvCookies = $this->getCacheVaryCookies();
2046
2047                 $cookiesOption = array();
2048                 foreach ( $cvCookies as $cookieName ) {
2049                         $cookiesOption[] = 'param=' . $cookieName;
2050                 }
2051                 $this->addVaryHeader( 'Cookie', $cookiesOption );
2052
2053                 $headers = array();
2054                 foreach ( $this->mVaryHeader as $header => $option ) {
2055                         $newheader = $header;
2056                         if ( is_array( $option ) && count( $option ) > 0 ) {
2057                                 $newheader .= ';' . implode( ';', $option );
2058                         }
2059                         $headers[] = $newheader;
2060                 }
2061                 $key = 'Key: ' . implode( ',', $headers );
2062
2063                 return $key;
2064         }
2065
2066         /**
2067          * T23672: Add Accept-Language to Vary and Key headers
2068          * if there's no 'variant' parameter existed in GET.
2069          *
2070          * For example:
2071          *   /w/index.php?title=Main_page should always be served; but
2072          *   /w/index.php?title=Main_page&variant=zh-cn should never be served.
2073          */
2074         function addAcceptLanguage() {
2075                 $title = $this->getTitle();
2076                 if ( !$title instanceof Title ) {
2077                         return;
2078                 }
2079
2080                 $lang = $title->getPageLanguage();
2081                 if ( !$this->getRequest()->getCheck( 'variant' ) && $lang->hasVariants() ) {
2082                         $variants = $lang->getVariants();
2083                         $aloption = array();
2084                         foreach ( $variants as $variant ) {
2085                                 if ( $variant === $lang->getCode() ) {
2086                                         continue;
2087                                 } else {
2088                                         $aloption[] = 'substr=' . $variant;
2089
2090                                         // IE and some other browsers use BCP 47 standards in
2091                                         // their Accept-Language header, like "zh-CN" or "zh-Hant".
2092                                         // We should handle these too.
2093                                         $variantBCP47 = wfBCP47( $variant );
2094                                         if ( $variantBCP47 !== $variant ) {
2095                                                 $aloption[] = 'substr=' . $variantBCP47;
2096                                         }
2097                                 }
2098                         }
2099                         $this->addVaryHeader( 'Accept-Language', $aloption );
2100                 }
2101         }
2102
2103         /**
2104          * Set a flag which will cause an X-Frame-Options header appropriate for
2105          * edit pages to be sent. The header value is controlled by
2106          * $wgEditPageFrameOptions.
2107          *
2108          * This is the default for special pages. If you display a CSRF-protected
2109          * form on an ordinary view page, then you need to call this function.
2110          *
2111          * @param bool $enable
2112          */
2113         public function preventClickjacking( $enable = true ) {
2114                 $this->mPreventClickjacking = $enable;
2115         }
2116
2117         /**
2118          * Turn off frame-breaking. Alias for $this->preventClickjacking(false).
2119          * This can be called from pages which do not contain any CSRF-protected
2120          * HTML form.
2121          */
2122         public function allowClickjacking() {
2123                 $this->mPreventClickjacking = false;
2124         }
2125
2126         /**
2127          * Get the prevent-clickjacking flag
2128          *
2129          * @since 1.24
2130          * @return bool
2131          */
2132         public function getPreventClickjacking() {
2133                 return $this->mPreventClickjacking;
2134         }
2135
2136         /**
2137          * Get the X-Frame-Options header value (without the name part), or false
2138          * if there isn't one. This is used by Skin to determine whether to enable
2139          * JavaScript frame-breaking, for clients that don't support X-Frame-Options.
2140          *
2141          * @return string
2142          */
2143         public function getFrameOptions() {
2144                 $config = $this->getConfig();
2145                 if ( $config->get( 'BreakFrames' ) ) {
2146                         return 'DENY';
2147                 } elseif ( $this->mPreventClickjacking && $config->get( 'EditPageFrameOptions' ) ) {
2148                         return $config->get( 'EditPageFrameOptions' );
2149                 }
2150                 return false;
2151         }
2152
2153         /**
2154          * Send cache control HTTP headers
2155          */
2156         public function sendCacheControl() {
2157                 $response = $this->getRequest()->response();
2158                 $config = $this->getConfig();
2159                 if ( $config->get( 'UseETag' ) && $this->mETag ) {
2160                         $response->header( "ETag: $this->mETag" );
2161                 }
2162
2163                 $this->addVaryHeader( 'Cookie' );
2164                 $this->addAcceptLanguage();
2165
2166                 # don't serve compressed data to clients who can't handle it
2167                 # maintain different caches for logged-in users and non-logged in ones
2168                 $response->header( $this->getVaryHeader() );
2169
2170                 if ( $config->get( 'UseKeyHeader' ) ) {
2171                         $response->header( $this->getKeyHeader() );
2172                 }
2173
2174                 if ( $this->mEnableClientCache ) {
2175                         if (
2176                                 $config->get( 'UseSquid' ) && session_id() == '' && !$this->isPrintable() &&
2177                                 $this->mCdnMaxage != 0 && !$this->haveCacheVaryCookies()
2178                         ) {
2179                                 if ( $config->get( 'UseESI' ) ) {
2180                                         # We'll purge the proxy cache explicitly, but require end user agents
2181                                         # to revalidate against the proxy on each visit.
2182                                         # Surrogate-Control controls our CDN, Cache-Control downstream caches
2183                                         wfDebug( __METHOD__ . ": proxy caching with ESI; {$this->mLastModified} **", 'private' );
2184                                         # start with a shorter timeout for initial testing
2185                                         # header( 'Surrogate-Control: max-age=2678400+2678400, content="ESI/1.0"');
2186                                         $response->header( 'Surrogate-Control: max-age=' . $config->get( 'SquidMaxage' )
2187                                                 . '+' . $this->mCdnMaxage . ', content="ESI/1.0"' );
2188                                         $response->header( 'Cache-Control: s-maxage=0, must-revalidate, max-age=0' );
2189                                 } else {
2190                                         # We'll purge the proxy cache for anons explicitly, but require end user agents
2191                                         # to revalidate against the proxy on each visit.
2192                                         # IMPORTANT! The CDN needs to replace the Cache-Control header with
2193                                         # Cache-Control: s-maxage=0, must-revalidate, max-age=0
2194                                         wfDebug( __METHOD__ . ": local proxy caching; {$this->mLastModified} **", 'private' );
2195                                         # start with a shorter timeout for initial testing
2196                                         # header( "Cache-Control: s-maxage=2678400, must-revalidate, max-age=0" );
2197                                         $response->header( 'Cache-Control: s-maxage=' . $this->mCdnMaxage
2198                                                 . ', must-revalidate, max-age=0' );
2199                                 }
2200                         } else {
2201                                 # We do want clients to cache if they can, but they *must* check for updates
2202                                 # on revisiting the page.
2203                                 wfDebug( __METHOD__ . ": private caching; {$this->mLastModified} **", 'private' );
2204                                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
2205                                 $response->header( "Cache-Control: private, must-revalidate, max-age=0" );
2206                         }
2207                         if ( $this->mLastModified ) {
2208                                 $response->header( "Last-Modified: {$this->mLastModified}" );
2209                         }
2210                 } else {
2211                         wfDebug( __METHOD__ . ": no caching **", 'private' );
2212
2213                         # In general, the absence of a last modified header should be enough to prevent
2214                         # the client from using its cache. We send a few other things just to make sure.
2215                         $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
2216                         $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
2217                         $response->header( 'Pragma: no-cache' );
2218                 }
2219         }
2220
2221         /**
2222          * Finally, all the text has been munged and accumulated into
2223          * the object, let's actually output it:
2224          */
2225         public function output() {
2226                 if ( $this->mDoNothing ) {
2227                         return;
2228                 }
2229
2230                 $response = $this->getRequest()->response();
2231                 $config = $this->getConfig();
2232
2233                 if ( $this->mRedirect != '' ) {
2234                         # Standards require redirect URLs to be absolute
2235                         $this->mRedirect = wfExpandUrl( $this->mRedirect, PROTO_CURRENT );
2236
2237                         $redirect = $this->mRedirect;
2238                         $code = $this->mRedirectCode;
2239
2240                         if ( Hooks::run( "BeforePageRedirect", array( $this, &$redirect, &$code ) ) ) {
2241                                 if ( $code == '301' || $code == '303' ) {
2242                                         if ( !$config->get( 'DebugRedirects' ) ) {
2243                                                 $response->statusHeader( $code );
2244                                         }
2245                                         $this->mLastModified = wfTimestamp( TS_RFC2822 );
2246                                 }
2247                                 if ( $config->get( 'VaryOnXFP' ) ) {
2248                                         $this->addVaryHeader( 'X-Forwarded-Proto' );
2249                                 }
2250                                 $this->sendCacheControl();
2251
2252                                 $response->header( "Content-Type: text/html; charset=utf-8" );
2253                                 if ( $config->get( 'DebugRedirects' ) ) {
2254                                         $url = htmlspecialchars( $redirect );
2255                                         print "<html>\n<head>\n<title>Redirect</title>\n</head>\n<body>\n";
2256                                         print "<p>Location: <a href=\"$url\">$url</a></p>\n";
2257                                         print "</body>\n</html>\n";
2258                                 } else {
2259                                         $response->header( 'Location: ' . $redirect );
2260                                 }
2261                         }
2262
2263                         return;
2264                 } elseif ( $this->mStatusCode ) {
2265                         $response->statusHeader( $this->mStatusCode );
2266                 }
2267
2268                 # Buffer output; final headers may depend on later processing
2269                 ob_start();
2270
2271                 $response->header( 'Content-type: ' . $config->get( 'MimeType' ) . '; charset=UTF-8' );
2272                 $response->header( 'Content-language: ' . $config->get( 'LanguageCode' ) );
2273
2274                 // Avoid Internet Explorer "compatibility view" in IE 8-10, so that
2275                 // jQuery etc. can work correctly.
2276                 $response->header( 'X-UA-Compatible: IE=Edge' );
2277
2278                 // Prevent framing, if requested
2279                 $frameOptions = $this->getFrameOptions();
2280                 if ( $frameOptions ) {
2281                         $response->header( "X-Frame-Options: $frameOptions" );
2282                 }
2283
2284                 if ( $this->mArticleBodyOnly ) {
2285                         echo $this->mBodytext;
2286                 } else {
2287                         $sk = $this->getSkin();
2288                         // add skin specific modules
2289                         $modules = $sk->getDefaultModules();
2290
2291                         // Enforce various default modules for all skins
2292                         $coreModules = array(
2293                                 // Keep this list as small as possible
2294                                 'site',
2295                                 'mediawiki.page.startup',
2296                                 'mediawiki.user',
2297                         );
2298
2299                         // Support for high-density display images if enabled
2300                         if ( $config->get( 'ResponsiveImages' ) ) {
2301                                 $coreModules[] = 'mediawiki.hidpi';
2302                         }
2303
2304                         $this->addModules( $coreModules );
2305                         foreach ( $modules as $group ) {
2306                                 $this->addModules( $group );
2307                         }
2308                         MWDebug::addModules( $this );
2309
2310                         // Hook that allows last minute changes to the output page, e.g.
2311                         // adding of CSS or Javascript by extensions.
2312                         Hooks::run( 'BeforePageDisplay', array( &$this, &$sk ) );
2313
2314                         $sk->outputPage();
2315                 }
2316
2317                 // This hook allows last minute changes to final overall output by modifying output buffer
2318                 Hooks::run( 'AfterFinalPageOutput', array( $this ) );
2319
2320                 $this->sendCacheControl();
2321
2322                 ob_end_flush();
2323
2324         }
2325
2326         /**
2327          * Actually output something with print.
2328          *
2329          * @param string $ins The string to output
2330          * @deprecated since 1.22 Use echo yourself.
2331          */
2332         public function out( $ins ) {
2333                 wfDeprecated( __METHOD__, '1.22' );
2334                 print $ins;
2335         }
2336
2337         /**
2338          * Prepare this object to display an error page; disable caching and
2339          * indexing, clear the current text and redirect, set the page's title
2340          * and optionally an custom HTML title (content of the "<title>" tag).
2341          *
2342          * @param string|Message $pageTitle Will be passed directly to setPageTitle()
2343          * @param string|Message $htmlTitle Will be passed directly to setHTMLTitle();
2344          *                   optional, if not passed the "<title>" attribute will be
2345          *                   based on $pageTitle
2346          */
2347         public function prepareErrorPage( $pageTitle, $htmlTitle = false ) {
2348                 $this->setPageTitle( $pageTitle );
2349                 if ( $htmlTitle !== false ) {
2350                         $this->setHTMLTitle( $htmlTitle );
2351                 }
2352                 $this->setRobotPolicy( 'noindex,nofollow' );
2353                 $this->setArticleRelated( false );
2354                 $this->enableClientCache( false );
2355                 $this->mRedirect = '';
2356                 $this->clearSubtitle();
2357                 $this->clearHTML();
2358         }
2359
2360         /**
2361          * Output a standard error page
2362          *
2363          * showErrorPage( 'titlemsg', 'pagetextmsg' );
2364          * showErrorPage( 'titlemsg', 'pagetextmsg', array( 'param1', 'param2' ) );
2365          * showErrorPage( 'titlemsg', $messageObject );
2366          * showErrorPage( $titleMessageObject, $messageObject );
2367          *
2368          * @param string|Message $title Message key (string) for page title, or a Message object
2369          * @param string|Message $msg Message key (string) for page text, or a Message object
2370          * @param array $params Message parameters; ignored if $msg is a Message object
2371          */
2372         public function showErrorPage( $title, $msg, $params = array() ) {
2373                 if ( !$title instanceof Message ) {
2374                         $title = $this->msg( $title );
2375                 }
2376
2377                 $this->prepareErrorPage( $title );
2378
2379                 if ( $msg instanceof Message ) {
2380                         if ( $params !== array() ) {
2381                                 trigger_error( 'Argument ignored: $params. The message parameters argument '
2382                                         . 'is discarded when the $msg argument is a Message object instead of '
2383                                         . 'a string.', E_USER_NOTICE );
2384                         }
2385                         $this->addHTML( $msg->parseAsBlock() );
2386                 } else {
2387                         $this->addWikiMsgArray( $msg, $params );
2388                 }
2389
2390                 $this->returnToMain();
2391         }
2392
2393         /**
2394          * Output a standard permission error page
2395          *
2396          * @param array $errors Error message keys
2397          * @param string $action Action that was denied or null if unknown
2398          */
2399         public function showPermissionsErrorPage( array $errors, $action = null ) {
2400                 // For some action (read, edit, create and upload), display a "login to do this action"
2401                 // error if all of the following conditions are met:
2402                 // 1. the user is not logged in
2403                 // 2. the only error is insufficient permissions (i.e. no block or something else)
2404                 // 3. the error can be avoided simply by logging in
2405                 if ( in_array( $action, array( 'read', 'edit', 'createpage', 'createtalk', 'upload' ) )
2406                         && $this->getUser()->isAnon() && count( $errors ) == 1 && isset( $errors[0][0] )
2407                         && ( $errors[0][0] == 'badaccess-groups' || $errors[0][0] == 'badaccess-group0' )
2408                         && ( User::groupHasPermission( 'user', $action )
2409                         || User::groupHasPermission( 'autoconfirmed', $action ) )
2410                 ) {
2411                         $displayReturnto = null;
2412
2413                         # Due to bug 32276, if a user does not have read permissions,
2414                         # $this->getTitle() will just give Special:Badtitle, which is
2415                         # not especially useful as a returnto parameter. Use the title
2416                         # from the request instead, if there was one.
2417                         $request = $this->getRequest();
2418                         $returnto = Title::newFromText( $request->getVal( 'title', '' ) );
2419                         if ( $action == 'edit' ) {
2420                                 $msg = 'whitelistedittext';
2421                                 $displayReturnto = $returnto;
2422                         } elseif ( $action == 'createpage' || $action == 'createtalk' ) {
2423                                 $msg = 'nocreatetext';
2424                         } elseif ( $action == 'upload' ) {
2425                                 $msg = 'uploadnologintext';
2426                         } else { # Read
2427                                 $msg = 'loginreqpagetext';
2428                                 $displayReturnto = Title::newMainPage();
2429                         }
2430
2431                         $query = array();
2432
2433                         if ( $returnto ) {
2434                                 $query['returnto'] = $returnto->getPrefixedText();
2435
2436                                 if ( !$request->wasPosted() ) {
2437                                         $returntoquery = $request->getValues();
2438                                         unset( $returntoquery['title'] );
2439                                         unset( $returntoquery['returnto'] );
2440                                         unset( $returntoquery['returntoquery'] );
2441                                         $query['returntoquery'] = wfArrayToCgi( $returntoquery );
2442                                 }
2443                         }
2444                         $loginLink = Linker::linkKnown(
2445                                 SpecialPage::getTitleFor( 'Userlogin' ),
2446                                 $this->msg( 'loginreqlink' )->escaped(),
2447                                 array(),
2448                                 $query
2449                         );
2450
2451                         $this->prepareErrorPage( $this->msg( 'loginreqtitle' ) );
2452                         $this->addHTML( $this->msg( $msg )->rawParams( $loginLink )->parse() );
2453
2454                         # Don't return to a page the user can't read otherwise
2455                         # we'll end up in a pointless loop
2456                         if ( $displayReturnto && $displayReturnto->userCan( 'read', $this->getUser() ) ) {
2457                                 $this->returnToMain( null, $displayReturnto );
2458                         }
2459                 } else {
2460                         $this->prepareErrorPage( $this->msg( 'permissionserrors' ) );
2461                         $this->addWikiText( $this->formatPermissionsErrorMessage( $errors, $action ) );
2462                 }
2463         }
2464
2465         /**
2466          * Display an error page indicating that a given version of MediaWiki is
2467          * required to use it
2468          *
2469          * @param mixed $version The version of MediaWiki needed to use the page
2470          */
2471         public function versionRequired( $version ) {
2472                 $this->prepareErrorPage( $this->msg( 'versionrequired', $version ) );
2473
2474                 $this->addWikiMsg( 'versionrequiredtext', $version );
2475                 $this->returnToMain();
2476         }
2477
2478         /**
2479          * Format a list of error messages
2480          *
2481          * @param array $errors Array of arrays returned by Title::getUserPermissionsErrors
2482          * @param string $action Action that was denied or null if unknown
2483          * @return string The wikitext error-messages, formatted into a list.
2484          */
2485         public function formatPermissionsErrorMessage( array $errors, $action = null ) {
2486                 if ( $action == null ) {
2487                         $text = $this->msg( 'permissionserrorstext', count( $errors ) )->plain() . "\n\n";
2488                 } else {
2489                         $action_desc = $this->msg( "action-$action" )->plain();
2490                         $text = $this->msg(
2491                                 'permissionserrorstext-withaction',
2492                                 count( $errors ),
2493                                 $action_desc
2494                         )->plain() . "\n\n";
2495                 }
2496
2497                 if ( count( $errors ) > 1 ) {
2498                         $text .= '<ul class="permissions-errors">' . "\n";
2499
2500                         foreach ( $errors as $error ) {
2501                                 $text .= '<li>';
2502                                 $text .= call_user_func_array( array( $this, 'msg' ), $error )->plain();
2503                                 $text .= "</li>\n";
2504                         }
2505                         $text .= '</ul>';
2506                 } else {
2507                         $text .= "<div class=\"permissions-errors\">\n" .
2508                                         call_user_func_array( array( $this, 'msg' ), reset( $errors ) )->plain() .
2509                                         "\n</div>";
2510                 }
2511
2512                 return $text;
2513         }
2514
2515         /**
2516          * Display a page stating that the Wiki is in read-only mode.
2517          * Should only be called after wfReadOnly() has returned true.
2518          *
2519          * Historically, this function was used to show the source of the page that the user
2520          * was trying to edit and _also_ permissions error messages. The relevant code was
2521          * moved into EditPage in 1.19 (r102024 / d83c2a431c2a) and removed here in 1.25.
2522          *
2523          * @deprecated since 1.25; throw the exception directly
2524          * @throws ReadOnlyError
2525          */
2526         public function readOnlyPage() {
2527                 if ( func_num_args() > 0 ) {
2528                         throw new MWException( __METHOD__ . ' no longer accepts arguments since 1.25.' );
2529                 }
2530
2531                 throw new ReadOnlyError;
2532         }
2533
2534         /**
2535          * Turn off regular page output and return an error response
2536          * for when rate limiting has triggered.
2537          *
2538          * @deprecated since 1.25; throw the exception directly
2539          */
2540         public function rateLimited() {
2541                 wfDeprecated( __METHOD__, '1.25' );
2542                 throw new ThrottledError;
2543         }
2544
2545         /**
2546          * Show a warning about slave lag
2547          *
2548          * If the lag is higher than $wgSlaveLagCritical seconds,
2549          * then the warning is a bit more obvious. If the lag is
2550          * lower than $wgSlaveLagWarning, then no warning is shown.
2551          *
2552          * @param int $lag Slave lag
2553          */
2554         public function showLagWarning( $lag ) {
2555                 $config = $this->getConfig();
2556                 if ( $lag >= $config->get( 'SlaveLagWarning' ) ) {
2557                         $message = $lag < $config->get( 'SlaveLagCritical' )
2558                                 ? 'lag-warn-normal'
2559                                 : 'lag-warn-high';
2560                         $wrap = Html::rawElement( 'div', array( 'class' => "mw-{$message}" ), "\n$1\n" );
2561                         $this->wrapWikiMsg( "$wrap\n", array( $message, $this->getLanguage()->formatNum( $lag ) ) );
2562                 }
2563         }
2564
2565         public function showFatalError( $message ) {
2566                 $this->prepareErrorPage( $this->msg( 'internalerror' ) );
2567
2568                 $this->addHTML( $message );
2569         }
2570
2571         public function showUnexpectedValueError( $name, $val ) {
2572                 $this->showFatalError( $this->msg( 'unexpected', $name, $val )->text() );
2573         }
2574
2575         public function showFileCopyError( $old, $new ) {
2576                 $this->showFatalError( $this->msg( 'filecopyerror', $old, $new )->text() );
2577         }
2578
2579         public function showFileRenameError( $old, $new ) {
2580                 $this->showFatalError( $this->msg( 'filerenameerror', $old, $new )->text() );
2581         }
2582
2583         public function showFileDeleteError( $name ) {
2584                 $this->showFatalError( $this->msg( 'filedeleteerror', $name )->text() );
2585         }
2586
2587         public function showFileNotFoundError( $name ) {
2588                 $this->showFatalError( $this->msg( 'filenotfound', $name )->text() );
2589         }
2590
2591         /**
2592          * Add a "return to" link pointing to a specified title
2593          *
2594          * @param Title $title Title to link
2595          * @param array $query Query string parameters
2596          * @param string $text Text of the link (input is not escaped)
2597          * @param array $options Options array to pass to Linker
2598          */
2599         public function addReturnTo( $title, array $query = array(), $text = null, $options = array() ) {
2600                 $link = $this->msg( 'returnto' )->rawParams(
2601                         Linker::link( $title, $text, array(), $query, $options ) )->escaped();
2602                 $this->addHTML( "<p id=\"mw-returnto\">{$link}</p>\n" );
2603         }
2604
2605         /**
2606          * Add a "return to" link pointing to a specified title,
2607          * or the title indicated in the request, or else the main page
2608          *
2609          * @param mixed $unused
2610          * @param Title|string $returnto Title or String to return to
2611          * @param string $returntoquery Query string for the return to link
2612          */
2613         public function returnToMain( $unused = null, $returnto = null, $returntoquery = null ) {
2614                 if ( $returnto == null ) {
2615                         $returnto = $this->getRequest()->getText( 'returnto' );
2616                 }
2617
2618                 if ( $returntoquery == null ) {
2619                         $returntoquery = $this->getRequest()->getText( 'returntoquery' );
2620                 }
2621
2622                 if ( $returnto === '' ) {
2623                         $returnto = Title::newMainPage();
2624                 }
2625
2626                 if ( is_object( $returnto ) ) {
2627                         $titleObj = $returnto;
2628                 } else {
2629                         $titleObj = Title::newFromText( $returnto );
2630                 }
2631                 if ( !is_object( $titleObj ) ) {
2632                         $titleObj = Title::newMainPage();
2633                 }
2634
2635                 $this->addReturnTo( $titleObj, wfCgiToArray( $returntoquery ) );
2636         }
2637
2638         /**
2639          * @param Skin $sk The given Skin
2640          * @param bool $includeStyle Unused
2641          * @return string The doctype, opening "<html>", and head element.
2642          */
2643         public function headElement( Skin $sk, $includeStyle = true ) {
2644                 global $wgContLang;
2645
2646                 $userdir = $this->getLanguage()->getDir();
2647                 $sitedir = $wgContLang->getDir();
2648
2649                 $ret = Html::htmlHeader( $sk->getHtmlElementAttributes() );
2650
2651                 if ( $this->getHTMLTitle() == '' ) {
2652                         $this->setHTMLTitle( $this->msg( 'pagetitle', $this->getPageTitle() )->inContentLanguage() );
2653                 }
2654
2655                 $openHead = Html::openElement( 'head' );
2656                 if ( $openHead ) {
2657                         # Don't bother with the newline if $head == ''
2658                         $ret .= "$openHead\n";
2659                 }
2660
2661                 if ( !Html::isXmlMimeType( $this->getConfig()->get( 'MimeType' ) ) ) {
2662                         // Add <meta charset="UTF-8">
2663                         // This should be before <title> since it defines the charset used by
2664                         // text including the text inside <title>.
2665                         // The spec recommends defining XHTML5's charset using the XML declaration
2666                         // instead of meta.
2667                         // Our XML declaration is output by Html::htmlHeader.
2668                         // http://www.whatwg.org/html/semantics.html#attr-meta-http-equiv-content-type
2669                         // http://www.whatwg.org/html/semantics.html#charset
2670                         $ret .= Html::element( 'meta', array( 'charset' => 'UTF-8' ) ) . "\n";
2671                 }
2672
2673                 $ret .= Html::element( 'title', null, $this->getHTMLTitle() ) . "\n";
2674                 $ret .= $this->getInlineHeadScripts() . "\n";
2675                 $ret .= $this->buildCssLinks() . "\n";
2676                 $ret .= $this->getExternalHeadScripts() . "\n";
2677
2678                 foreach ( $this->getHeadLinksArray() as $item ) {
2679                         $ret .= $item . "\n";
2680                 }
2681
2682                 foreach ( $this->mHeadItems as $item ) {
2683                         $ret .= $item . "\n";
2684                 }
2685
2686                 $closeHead = Html::closeElement( 'head' );
2687                 if ( $closeHead ) {
2688                         $ret .= "$closeHead\n";
2689                 }
2690
2691                 $bodyClasses = array();
2692                 $bodyClasses[] = 'mediawiki';
2693
2694                 # Classes for LTR/RTL directionality support
2695                 $bodyClasses[] = $userdir;
2696                 $bodyClasses[] = "sitedir-$sitedir";
2697
2698                 if ( $this->getLanguage()->capitalizeAllNouns() ) {
2699                         # A <body> class is probably not the best way to do this . . .
2700                         $bodyClasses[] = 'capitalize-all-nouns';
2701                 }
2702
2703                 $bodyClasses[] = $sk->getPageClasses( $this->getTitle() );
2704                 $bodyClasses[] = 'skin-' . Sanitizer::escapeClass( $sk->getSkinName() );
2705                 $bodyClasses[] =
2706                         'action-' . Sanitizer::escapeClass( Action::getActionName( $this->getContext() ) );
2707
2708                 $bodyAttrs = array();
2709                 // While the implode() is not strictly needed, it's used for backwards compatibility
2710                 // (this used to be built as a string and hooks likely still expect that).
2711                 $bodyAttrs['class'] = implode( ' ', $bodyClasses );
2712
2713                 // Allow skins and extensions to add body attributes they need
2714                 $sk->addToBodyAttributes( $this, $bodyAttrs );
2715                 Hooks::run( 'OutputPageBodyAttributes', array( $this, $sk, &$bodyAttrs ) );
2716
2717                 $ret .= Html::openElement( 'body', $bodyAttrs ) . "\n";
2718
2719                 return $ret;
2720         }
2721
2722         /**
2723          * Get a ResourceLoader object associated with this OutputPage
2724          *
2725          * @return ResourceLoader
2726          */
2727         public function getResourceLoader() {
2728                 if ( is_null( $this->mResourceLoader ) ) {
2729                         $this->mResourceLoader = new ResourceLoader(
2730                                 $this->getConfig(),
2731                                 LoggerFactory::getInstance( 'resourceloader' )
2732                         );
2733                 }
2734                 return $this->mResourceLoader;
2735         }
2736
2737         /**
2738          * Construct neccecary html and loader preset states to load modules on a page.
2739          *
2740          * Use getHtmlFromLoaderLinks() to convert this array to HTML.
2741          *
2742          * @param array|string $modules One or more module names
2743          * @param string $only ResourceLoaderModule TYPE_ class constant
2744          * @param array $extraQuery [optional] Array with extra query parameters for the request
2745          * @return array A list of HTML strings and array of client loader preset states
2746          */
2747         public function makeResourceLoaderLink( $modules, $only, array $extraQuery = array() ) {
2748                 $modules = (array)$modules;
2749
2750                 $links = array(
2751                         // List of html strings
2752                         'html' => array(),
2753                         // Associative array of module names and their states
2754                         'states' => array(),
2755                 );
2756
2757                 if ( !count( $modules ) ) {
2758                         return $links;
2759                 }
2760
2761                 if ( count( $modules ) > 1 ) {
2762                         // Remove duplicate module requests
2763                         $modules = array_unique( $modules );
2764                         // Sort module names so requests are more uniform
2765                         sort( $modules );
2766
2767                         if ( ResourceLoader::inDebugMode() ) {
2768                                 // Recursively call us for every item
2769                                 foreach ( $modules as $name ) {
2770                                         $link = $this->makeResourceLoaderLink( $name, $only, $extraQuery );
2771                                         $links['html'] = array_merge( $links['html'], $link['html'] );
2772                                         $links['states'] += $link['states'];
2773                                 }
2774                                 return $links;
2775                         }
2776                 }
2777
2778                 if ( !is_null( $this->mTarget ) ) {
2779                         $extraQuery['target'] = $this->mTarget;
2780                 }
2781
2782                 // Create keyed-by-source and then keyed-by-group list of module objects from modules list
2783                 $sortedModules = array();
2784                 $resourceLoader = $this->getResourceLoader();
2785                 foreach ( $modules as $name ) {
2786                         $module = $resourceLoader->getModule( $name );
2787                         # Check that we're allowed to include this module on this page
2788                         if ( !$module
2789                                 || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_SCRIPTS )
2790                                         && $only == ResourceLoaderModule::TYPE_SCRIPTS )
2791                                 || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_STYLES )
2792                                         && $only == ResourceLoaderModule::TYPE_STYLES )
2793                                 || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_COMBINED )
2794                                         && $only == ResourceLoaderModule::TYPE_COMBINED )
2795                                 || ( $this->mTarget && !in_array( $this->mTarget, $module->getTargets() ) )
2796                         ) {
2797                                 continue;
2798                         }
2799
2800                         $sortedModules[$module->getSource()][$module->getGroup()][$name] = $module;
2801                 }
2802
2803                 foreach ( $sortedModules as $source => $groups ) {
2804                         foreach ( $groups as $group => $grpModules ) {
2805                                 // Special handling for user-specific groups
2806                                 $user = null;
2807                                 if ( ( $group === 'user' || $group === 'private' ) && $this->getUser()->isLoggedIn() ) {
2808                                         $user = $this->getUser()->getName();
2809                                 }
2810
2811                                 // Create a fake request based on the one we are about to make so modules return
2812                                 // correct timestamp and emptiness data
2813                                 $query = ResourceLoader::makeLoaderQuery(
2814                                         array(), // modules; not determined yet
2815                                         $this->getLanguage()->getCode(),
2816                                         $this->getSkin()->getSkinName(),
2817                                         $user,
2818                                         null, // version; not determined yet
2819                                         ResourceLoader::inDebugMode(),
2820                                         $only === ResourceLoaderModule::TYPE_COMBINED ? null : $only,
2821                                         $this->isPrintable(),
2822                                         $this->getRequest()->getBool( 'handheld' ),
2823                                         $extraQuery
2824                                 );
2825                                 $context = new ResourceLoaderContext( $resourceLoader, new FauxRequest( $query ) );
2826
2827                                 // Extract modules that know they're empty and see if we have one or more
2828                                 // raw modules
2829                                 $isRaw = false;
2830                                 foreach ( $grpModules as $key => $module ) {
2831                                         // Inline empty modules: since they're empty, just mark them as 'ready' (bug 46857)
2832                                         // If we're only getting the styles, we don't need to do anything for empty modules.
2833                                         if ( $module->isKnownEmpty( $context ) ) {
2834                                                 unset( $grpModules[$key] );
2835                                                 if ( $only !== ResourceLoaderModule::TYPE_STYLES ) {
2836                                                         $links['states'][$key] = 'ready';
2837                                                 }
2838                                         }
2839
2840                                         $isRaw |= $module->isRaw();
2841                                 }
2842
2843                                 // If there are no non-empty modules, skip this group
2844                                 if ( count( $grpModules ) === 0 ) {
2845                                         continue;
2846                                 }
2847
2848                                 // Inline private modules. These can't be loaded through load.php for security
2849                                 // reasons, see bug 34907. Note that these modules should be loaded from
2850                                 // getExternalHeadScripts() before the first loader call. Otherwise other modules can't
2851                                 // properly use them as dependencies (bug 30914)
2852                                 if ( $group === 'private' ) {
2853                                         if ( $only == ResourceLoaderModule::TYPE_STYLES ) {
2854                                                 $links['html'][] = Html::inlineStyle(
2855                                                         $resourceLoader->makeModuleResponse( $context, $grpModules )
2856                                                 );
2857                                         } else {
2858                                                 $links['html'][] = ResourceLoader::makeInlineScript(
2859                                                         $resourceLoader->makeModuleResponse( $context, $grpModules )
2860                                                 );
2861                                         }
2862                                         continue;
2863                                 }
2864
2865                                 // Special handling for the user group; because users might change their stuff
2866                                 // on-wiki like user pages, or user preferences; we need to find the highest
2867                                 // timestamp of these user-changeable modules so we can ensure cache misses on change
2868                                 // This should NOT be done for the site group (bug 27564) because anons get that too
2869                                 // and we shouldn't be putting timestamps in CDN-cached HTML
2870                                 $version = null;
2871                                 if ( $group === 'user' ) {
2872                                         $query['version'] = $resourceLoader->getCombinedVersion( $context, array_keys( $grpModules ) );
2873                                 }
2874
2875                                 $query['modules'] = ResourceLoader::makePackedModulesString( array_keys( $grpModules ) );
2876                                 $moduleContext = new ResourceLoaderContext( $resourceLoader, new FauxRequest( $query ) );
2877                                 $url = $resourceLoader->createLoaderURL( $source, $moduleContext, $extraQuery );
2878
2879                                 // Automatically select style/script elements
2880                                 if ( $only === ResourceLoaderModule::TYPE_STYLES ) {
2881                                         $link = Html::linkedStyle( $url );
2882                                 } else {
2883                                         if ( $context->getRaw() || $isRaw ) {
2884                                                 // Startup module can't load itself, needs to use <script> instead of mw.loader.load
2885                                                 $link = Html::element( 'script', array(
2886                                                         // In SpecialJavaScriptTest, QUnit must load synchronous
2887                                                         'async' => !isset( $extraQuery['sync'] ),
2888                                                         'src' => $url
2889                                                 ) );
2890                                         } else {
2891                                                 $link = ResourceLoader::makeInlineScript(
2892                                                         Xml::encodeJsCall( 'mw.loader.load', array( $url ) )
2893                                                 );
2894                                         }
2895
2896                                         // For modules requested directly in the html via <script> or mw.loader.load
2897                                         // tell mw.loader they are being loading to prevent duplicate requests.
2898                                         foreach ( $grpModules as $key => $module ) {
2899                                                 // Don't output state=loading for the startup module.
2900                                                 if ( $key !== 'startup' ) {
2901                                                         $links['states'][$key] = 'loading';
2902                                                 }
2903                                         }
2904                                 }
2905
2906                                 if ( $group == 'noscript' ) {
2907                                         $links['html'][] = Html::rawElement( 'noscript', array(), $link );
2908                                 } else {
2909                                         $links['html'][] = $link;
2910                                 }
2911                         }
2912                 }
2913
2914                 return $links;
2915         }
2916
2917         /**
2918          * Build html output from an array of links from makeResourceLoaderLink.
2919          * @param array $links
2920          * @return string HTML
2921          */
2922         protected static function getHtmlFromLoaderLinks( array $links ) {
2923                 $html = array();
2924                 $states = array();
2925                 foreach ( $links as $link ) {
2926                         if ( !is_array( $link ) ) {
2927                                 $html[] = $link;
2928                         } else {
2929                                 $html = array_merge( $html, $link['html'] );
2930                                 $states += $link['states'];
2931                         }
2932                 }
2933                 // Filter out empty values
2934                 $html = array_filter( $html, 'strlen' );
2935
2936                 if ( count( $states ) ) {
2937                         array_unshift( $html, ResourceLoader::makeInlineScript(
2938                                 ResourceLoader::makeLoaderStateScript( $states )
2939                         ) );
2940                 }
2941
2942                 return WrappedString::join( "\n", $html );
2943         }
2944
2945         /**
2946          * JS stuff to put in the "<head>". This is the startup module, config
2947          * vars and modules marked with position 'top'
2948          *
2949          * @return string HTML fragment
2950          */
2951         function getHeadScripts() {
2952                 return $this->getInlineHeadScripts() . "\n" . $this->getExternalHeadScripts();
2953         }
2954
2955         /**
2956          * <script src="..."> tags for "<head>". This is the startup module
2957          * and other modules marked with position 'top'.
2958          *
2959          * @return string HTML fragment
2960          */
2961         function getExternalHeadScripts() {
2962                 $links = array();
2963
2964                 // Startup - this provides the client with the module
2965                 // manifest and loads jquery and mediawiki base modules
2966                 $links[] = $this->makeResourceLoaderLink( 'startup', ResourceLoaderModule::TYPE_SCRIPTS );
2967
2968                 return self::getHtmlFromLoaderLinks( $links );
2969         }
2970
2971         /**
2972          * <script>...</script> tags to put in "<head>".
2973          *
2974          * @return string HTML fragment
2975          */
2976         function getInlineHeadScripts() {
2977                 $links = array();
2978
2979                 // Client profile classes for <html>. Allows for easy hiding/showing of UI components.
2980                 // Must be done synchronously on every page to avoid flashes of wrong content.
2981                 // Note: This class distinguishes MediaWiki-supported JavaScript from the rest.
2982                 // The "rest" includes browsers that support JavaScript but not supported by our runtime.
2983                 // For the performance benefit of the majority, this is added unconditionally here and is
2984                 // then fixed up by the startup module for unsupported browsers.
2985                 $links[] = Html::inlineScript(
2986                         'document.documentElement.className = document.documentElement.className'
2987                         . '.replace( /(^|\s)client-nojs(\s|$)/, "$1client-js$2" );'
2988                 );
2989
2990                 // Load config before anything else
2991                 $links[] = ResourceLoader::makeInlineScript(
2992                         ResourceLoader::makeConfigSetScript( $this->getJSVars() )
2993                 );
2994
2995                 // Load embeddable private modules before any loader links
2996                 // This needs to be TYPE_COMBINED so these modules are properly wrapped
2997                 // in mw.loader.implement() calls and deferred until mw.user is available
2998                 $embedScripts = array( 'user.options' );
2999                 $links[] = $this->makeResourceLoaderLink(
3000                         $embedScripts,
3001                         ResourceLoaderModule::TYPE_COMBINED
3002                 );
3003                 // Separate user.tokens as otherwise caching will be allowed (T84960)
3004                 $links[] = $this->makeResourceLoaderLink(
3005                         'user.tokens',
3006                         ResourceLoaderModule::TYPE_COMBINED
3007                 );
3008
3009                 // Modules requests - let the client calculate dependencies and batch requests as it likes
3010                 // Only load modules that have marked themselves for loading at the top
3011                 $modules = $this->getModules( true, 'top' );
3012                 if ( $modules ) {
3013                         $links[] = ResourceLoader::makeInlineScript(
3014                                 Xml::encodeJsCall( 'mw.loader.load', array( $modules ) )
3015                         );
3016                 }
3017
3018                 // "Scripts only" modules marked for top inclusion
3019                 $links[] = $this->makeResourceLoaderLink(
3020                         $this->getModuleScripts( true, 'top' ),
3021                         ResourceLoaderModule::TYPE_SCRIPTS
3022                 );
3023
3024                 return self::getHtmlFromLoaderLinks( $links );
3025         }
3026
3027         /**
3028          * JS stuff to put at the 'bottom', which goes at the bottom of the `<body>`.
3029          * These are modules marked with position 'bottom', legacy scripts ($this->mScripts),
3030          * site JS, and user JS.
3031          *
3032          * @param bool $unused Previously used to let this method change its output based
3033          *  on whether it was called by getExternalHeadScripts() or getBottomScripts().
3034          * @return string
3035          */
3036         function getScriptsForBottomQueue( $unused = null ) {
3037                 // Scripts "only" requests marked for bottom inclusion
3038                 // If we're in the <head>, use load() calls rather than <script src="..."> tags
3039                 $links = array();
3040
3041                 $links[] = $this->makeResourceLoaderLink( $this->getModuleScripts( true, 'bottom' ),
3042                         ResourceLoaderModule::TYPE_SCRIPTS
3043                 );
3044
3045                 // Modules requests - let the client calculate dependencies and batch requests as it likes
3046                 // Only load modules that have marked themselves for loading at the bottom
3047                 $modules = $this->getModules( true, 'bottom' );
3048                 if ( $modules ) {
3049                         $links[] = ResourceLoader::makeInlineScript(
3050                                 Xml::encodeJsCall( 'mw.loader.load', array( $modules ) )
3051                         );
3052                 }
3053
3054                 // Legacy Scripts
3055                 $links[] = $this->mScripts;
3056
3057                 // Add user JS if enabled
3058                 // This must use TYPE_COMBINED instead of only=scripts so that its request is handled by
3059                 // mw.loader.implement() which ensures that execution is scheduled after the "site" module.
3060                 if ( $this->getConfig()->get( 'AllowUserJs' )
3061                         && $this->getUser()->isLoggedIn()
3062                         && $this->getTitle()
3063                         && $this->getTitle()->isJsSubpage()
3064                         && $this->userCanPreview()
3065                 ) {
3066                         // We're on a preview of a JS subpage. Exclude this page from the user module (T28283)
3067                         // and include the draft contents as a raw script instead.
3068                         $links[] = $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_COMBINED,
3069                                 array( 'excludepage' => $this->getTitle()->getPrefixedDBkey() )
3070                         );
3071                         // Load the previewed JS
3072                         $links[] = ResourceLoader::makeInlineScript(
3073                                 Xml::encodeJsCall( 'mw.loader.using', array(
3074                                         array( 'user', 'site' ),
3075                                         new XmlJsCode(
3076                                                 'function () {'
3077                                                         . Xml::encodeJsCall( '$.globalEval', array(
3078                                                                 $this->getRequest()->getText( 'wpTextbox1' )
3079                                                         ) )
3080                                                         . '}'
3081                                         )
3082                                 ) )
3083                         );
3084
3085                         // FIXME: If the user is previewing, say, ./vector.js, his ./common.js will be loaded
3086                         // asynchronously and may arrive *after* the inline script here. So the previewed code
3087                         // may execute before ./common.js runs. Normally, ./common.js runs before ./vector.js.
3088                         // Similarly, when previewing ./common.js and the user module does arrive first,
3089                         // it will arrive without common.js and the inline script runs after.
3090                         // Thus running common after the excluded subpage.
3091                 } else {
3092                         // Include the user module normally, i.e., raw to avoid it being wrapped in a closure.
3093                         $links[] = $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_COMBINED );
3094                 }
3095
3096                 // Group JS is only enabled if site JS is enabled.
3097                 $links[] = $this->makeResourceLoaderLink(
3098                         'user.groups',
3099                         ResourceLoaderModule::TYPE_COMBINED
3100                 );
3101
3102                 return self::getHtmlFromLoaderLinks( $links );
3103         }
3104
3105         /**
3106          * JS stuff to put at the bottom of the "<body>"
3107          * @return string
3108          */
3109         function getBottomScripts() {
3110                 return $this->getScriptsForBottomQueue();
3111         }
3112
3113         /**
3114          * Get the javascript config vars to include on this page
3115          *
3116          * @return array Array of javascript config vars
3117          * @since 1.23
3118          */
3119         public function getJsConfigVars() {
3120                 return $this->mJsConfigVars;
3121         }
3122
3123         /**
3124          * Add one or more variables to be set in mw.config in JavaScript
3125          *
3126          * @param string|array $keys Key or array of key/value pairs
3127          * @param mixed $value [optional] Value of the configuration variable
3128          */
3129         public function addJsConfigVars( $keys, $value = null ) {
3130                 if ( is_array( $keys ) ) {
3131                         foreach ( $keys as $key => $value ) {
3132                                 $this->mJsConfigVars[$key] = $value;
3133                         }
3134                         return;
3135                 }
3136
3137                 $this->mJsConfigVars[$keys] = $value;
3138         }
3139
3140         /**
3141          * Get an array containing the variables to be set in mw.config in JavaScript.
3142          *
3143          * Do not add things here which can be evaluated in ResourceLoaderStartUpModule
3144          * - in other words, page-independent/site-wide variables (without state).
3145          * You will only be adding bloat to the html page and causing page caches to
3146          * have to be purged on configuration changes.
3147          * @return array
3148          */
3149         public function getJSVars() {
3150                 global $wgContLang;
3151
3152                 $curRevisionId = 0;
3153                 $articleId = 0;
3154                 $canonicalSpecialPageName = false; # bug 21115
3155
3156                 $title = $this->getTitle();
3157                 $ns = $title->getNamespace();
3158                 $canonicalNamespace = MWNamespace::exists( $ns )
3159                         ? MWNamespace::getCanonicalName( $ns )
3160                         : $title->getNsText();
3161
3162                 $sk = $this->getSkin();
3163                 // Get the relevant title so that AJAX features can use the correct page name
3164                 // when making API requests from certain special pages (bug 34972).
3165                 $relevantTitle = $sk->getRelevantTitle();
3166                 $relevantUser = $sk->getRelevantUser();
3167
3168                 if ( $ns == NS_SPECIAL ) {
3169                         list( $canonicalSpecialPageName, /*...*/ ) =
3170                                 SpecialPageFactory::resolveAlias( $title->getDBkey() );
3171                 } elseif ( $this->canUseWikiPage() ) {
3172                         $wikiPage = $this->getWikiPage();
3173                         $curRevisionId = $wikiPage->getLatest();
3174                         $articleId = $wikiPage->getId();
3175                 }
3176
3177                 $lang = $title->getPageLanguage();
3178
3179                 // Pre-process information
3180                 $separatorTransTable = $lang->separatorTransformTable();
3181                 $separatorTransTable = $separatorTransTable ? $separatorTransTable : array();
3182                 $compactSeparatorTransTable = array(
3183                         implode( "\t", array_keys( $separatorTransTable ) ),
3184                         implode( "\t", $separatorTransTable ),
3185                 );
3186                 $digitTransTable = $lang->digitTransformTable();
3187                 $digitTransTable = $digitTransTable ? $digitTransTable : array();
3188                 $compactDigitTransTable = array(
3189                         implode( "\t", array_keys( $digitTransTable ) ),
3190                         implode( "\t", $digitTransTable ),
3191                 );
3192
3193                 $user = $this->getUser();
3194
3195                 $vars = array(
3196                         'wgCanonicalNamespace' => $canonicalNamespace,
3197                         'wgCanonicalSpecialPageName' => $canonicalSpecialPageName,
3198                         'wgNamespaceNumber' => $title->getNamespace(),
3199                         'wgPageName' => $title->getPrefixedDBkey(),
3200                         'wgTitle' => $title->getText(),
3201                         'wgCurRevisionId' => $curRevisionId,
3202                         'wgRevisionId' => (int)$this->getRevisionId(),
3203                         'wgArticleId' => $articleId,
3204                         'wgIsArticle' => $this->isArticle(),
3205                         'wgIsRedirect' => $title->isRedirect(),
3206                         'wgAction' => Action::getActionName( $this->getContext() ),
3207                         'wgUserName' => $user->isAnon() ? null : $user->getName(),
3208                         'wgUserGroups' => $user->getEffectiveGroups(),
3209                         'wgCategories' => $this->getCategories(),
3210                         'wgBreakFrames' => $this->getFrameOptions() == 'DENY',
3211                         'wgPageContentLanguage' => $lang->getCode(),
3212                         'wgPageContentModel' => $title->getContentModel(),
3213                         'wgSeparatorTransformTable' => $compactSeparatorTransTable,
3214                         'wgDigitTransformTable' => $compactDigitTransTable,
3215                         'wgDefaultDateFormat' => $lang->getDefaultDateFormat(),
3216                         'wgMonthNames' => $lang->getMonthNamesArray(),
3217                         'wgMonthNamesShort' => $lang->getMonthAbbreviationsArray(),
3218                         'wgRelevantPageName' => $relevantTitle->getPrefixedDBkey(),
3219                         'wgRelevantArticleId' => $relevantTitle->getArticleId(),
3220                 );
3221
3222                 if ( $user->isLoggedIn() ) {
3223                         $vars['wgUserId'] = $user->getId();
3224                         $vars['wgUserEditCount'] = $user->getEditCount();
3225                         $userReg = wfTimestampOrNull( TS_UNIX, $user->getRegistration() );
3226                         $vars['wgUserRegistration'] = $userReg !== null ? ( $userReg * 1000 ) : null;
3227                         // Get the revision ID of the oldest new message on the user's talk
3228                         // page. This can be used for constructing new message alerts on
3229                         // the client side.
3230                         $vars['wgUserNewMsgRevisionId'] = $user->getNewMessageRevisionId();
3231                 }
3232
3233                 if ( $wgContLang->hasVariants() ) {
3234                         $vars['wgUserVariant'] = $wgContLang->getPreferredVariant();
3235                 }
3236                 // Same test as SkinTemplate
3237                 $vars['wgIsProbablyEditable'] = $title->quickUserCan( 'edit', $user )
3238                         && ( $title->exists() || $title->quickUserCan( 'create', $user ) );
3239
3240                 foreach ( $title->getRestrictionTypes() as $type ) {
3241                         $vars['wgRestriction' . ucfirst( $type )] = $title->getRestrictions( $type );
3242                 }
3243
3244                 if ( $title->isMainPage() ) {
3245                         $vars['wgIsMainPage'] = true;
3246                 }
3247
3248                 if ( $this->mRedirectedFrom ) {
3249                         $vars['wgRedirectedFrom'] = $this->mRedirectedFrom->getPrefixedDBkey();
3250                 }
3251
3252                 if ( $relevantUser ) {
3253                         $vars['wgRelevantUserName'] = $relevantUser->getName();
3254                 }
3255
3256                 // Allow extensions to add their custom variables to the mw.config map.
3257                 // Use the 'ResourceLoaderGetConfigVars' hook if the variable is not
3258                 // page-dependant but site-wide (without state).
3259                 // Alternatively, you may want to use OutputPage->addJsConfigVars() instead.
3260                 Hooks::run( 'MakeGlobalVariablesScript', array( &$vars, $this ) );
3261
3262                 // Merge in variables from addJsConfigVars last
3263                 return array_merge( $vars, $this->getJsConfigVars() );
3264         }
3265
3266         /**
3267          * To make it harder for someone to slip a user a fake
3268          * user-JavaScript or user-CSS preview, a random token
3269          * is associated with the login session. If it's not
3270          * passed back with the preview request, we won't render
3271          * the code.
3272          *
3273          * @return bool
3274          */
3275         public function userCanPreview() {
3276                 $request = $this->getRequest();
3277                 if (
3278                         $request->getVal( 'action' ) !== 'submit' ||
3279                         !$request->getCheck( 'wpPreview' ) ||
3280                         !$request->wasPosted()
3281                 ) {
3282                         return false;
3283                 }
3284
3285                 $user = $this->getUser();
3286                 if ( !$user->matchEditToken( $request->getVal( 'wpEditToken' ) ) ) {
3287                         return false;
3288                 }
3289
3290                 $title = $this->getTitle();
3291                 if ( !$title->isJsSubpage() && !$title->isCssSubpage() ) {
3292                         return false;
3293                 }
3294                 if ( !$title->isSubpageOf( $user->getUserPage() ) ) {
3295                         // Don't execute another user's CSS or JS on preview (T85855)
3296                         return false;
3297                 }
3298
3299                 $errors = $title->getUserPermissionsErrors( 'edit', $user );
3300                 if ( count( $errors ) !== 0 ) {
3301                         return false;
3302                 }
3303
3304                 return true;
3305         }
3306
3307         /**
3308          * @return array Array in format "link name or number => 'link html'".
3309          */
3310         public function getHeadLinksArray() {
3311                 global $wgVersion;
3312
3313                 $tags = array();
3314                 $config = $this->getConfig();
3315
3316                 $canonicalUrl = $this->mCanonicalUrl;
3317
3318                 $tags['meta-generator'] = Html::element( 'meta', array(
3319                         'name' => 'generator',
3320                         'content' => "MediaWiki $wgVersion",
3321                 ) );
3322
3323                 if ( $config->get( 'ReferrerPolicy' ) !== false ) {
3324                         $tags['meta-referrer'] = Html::element( 'meta', array(
3325                                 'name' => 'referrer',
3326                                 'content' => $config->get( 'ReferrerPolicy' )
3327                         ) );
3328                 }
3329
3330                 $p = "{$this->mIndexPolicy},{$this->mFollowPolicy}";
3331                 if ( $p !== 'index,follow' ) {
3332                         // http://www.robotstxt.org/wc/meta-user.html
3333                         // Only show if it's different from the default robots policy
3334                         $tags['meta-robots'] = Html::element( 'meta', array(
3335                                 'name' => 'robots',
3336                                 'content' => $p,
3337                         ) );
3338                 }
3339
3340                 foreach ( $this->mMetatags as $tag ) {
3341                         if ( 0 == strcasecmp( 'http:', substr( $tag[0], 0, 5 ) ) ) {
3342                                 $a = 'http-equiv';
3343                                 $tag[0] = substr( $tag[0], 5 );
3344                         } else {
3345                                 $a = 'name';
3346                         }
3347                         $tagName = "meta-{$tag[0]}";
3348                         if ( isset( $tags[$tagName] ) ) {
3349                                 $tagName .= $tag[1];
3350                         }
3351                         $tags[$tagName] = Html::element( 'meta',
3352                                 array(
3353                                         $a => $tag[0],
3354                                         'content' => $tag[1]
3355                                 )
3356                         );
3357                 }
3358
3359                 foreach ( $this->mLinktags as $tag ) {
3360                         $tags[] = Html::element( 'link', $tag );
3361                 }
3362
3363                 # Universal edit button
3364                 if ( $config->get( 'UniversalEditButton' ) && $this->isArticleRelated() ) {
3365                         $user = $this->getUser();
3366                         if ( $this->getTitle()->quickUserCan( 'edit', $user )
3367                                 && ( $this->getTitle()->exists() ||
3368                                         $this->getTitle()->quickUserCan( 'create', $user ) )
3369                         ) {
3370                                 // Original UniversalEditButton
3371                                 $msg = $this->msg( 'edit' )->text();
3372                                 $tags['universal-edit-button'] = Html::element( 'link', array(
3373                                         'rel' => 'alternate',
3374                                         'type' => 'application/x-wiki',
3375                                         'title' => $msg,
3376                                         'href' => $this->getTitle()->getEditURL(),
3377                                 ) );
3378                                 // Alternate edit link
3379                                 $tags['alternative-edit'] = Html::element( 'link', array(
3380                                         'rel' => 'edit',
3381                                         'title' => $msg,
3382                                         'href' => $this->getTitle()->getEditURL(),
3383                                 ) );
3384                         }
3385                 }
3386
3387                 # Generally the order of the favicon and apple-touch-icon links
3388                 # should not matter, but Konqueror (3.5.9 at least) incorrectly
3389                 # uses whichever one appears later in the HTML source. Make sure
3390                 # apple-touch-icon is specified first to avoid this.
3391                 if ( $config->get( 'AppleTouchIcon' ) !== false ) {
3392                         $tags['apple-touch-icon'] = Html::element( 'link', array(
3393                                 'rel' => 'apple-touch-icon',
3394                                 'href' => $config->get( 'AppleTouchIcon' )
3395                         ) );
3396                 }
3397
3398                 if ( $config->get( 'Favicon' ) !== false ) {
3399                         $tags['favicon'] = Html::element( 'link', array(
3400                                 'rel' => 'shortcut icon',
3401                                 'href' => $config->get( 'Favicon' )
3402                         ) );
3403                 }
3404
3405                 # OpenSearch description link
3406                 $tags['opensearch'] = Html::element( 'link', array(
3407                         'rel' => 'search',
3408                         'type' => 'application/opensearchdescription+xml',
3409                         'href' => wfScript( 'opensearch_desc' ),
3410                         'title' => $this->msg( 'opensearch-desc' )->inContentLanguage()->text(),
3411                 ) );
3412
3413                 if ( $config->get( 'EnableAPI' ) ) {
3414                         # Real Simple Discovery link, provides auto-discovery information
3415                         # for the MediaWiki API (and potentially additional custom API
3416                         # support such as WordPress or Twitter-compatible APIs for a
3417                         # blogging extension, etc)
3418                         $tags['rsd'] = Html::element( 'link', array(
3419                                 'rel' => 'EditURI',
3420                                 'type' => 'application/rsd+xml',
3421                                 // Output a protocol-relative URL here if $wgServer is protocol-relative.
3422                                 // Whether RSD accepts relative or protocol-relative URLs is completely
3423                                 // undocumented, though.
3424                                 'href' => wfExpandUrl( wfAppendQuery(
3425                                         wfScript( 'api' ),
3426                                         array( 'action' => 'rsd' ) ),
3427                                         PROTO_RELATIVE
3428                                 ),
3429                         ) );
3430                 }
3431
3432                 # Language variants
3433                 if ( !$config->get( 'DisableLangConversion' ) ) {
3434                         $lang = $this->getTitle()->getPageLanguage();
3435                         if ( $lang->hasVariants() ) {
3436                                 $variants = $lang->getVariants();
3437                                 foreach ( $variants as $variant ) {
3438                                         $tags["variant-$variant"] = Html::element( 'link', array(
3439                                                 'rel' => 'alternate',
3440                                                 'hreflang' => wfBCP47( $variant ),
3441                                                 'href' => $this->getTitle()->getLocalURL(
3442                                                         array( 'variant' => $variant ) )
3443                                                 )
3444                                         );
3445                                 }
3446                                 # x-default link per https://support.google.com/webmasters/answer/189077?hl=en
3447                                 $tags["variant-x-default"] = Html::element( 'link', array(
3448                                         'rel' => 'alternate',
3449                                         'hreflang' => 'x-default',
3450                                         'href' => $this->getTitle()->getLocalURL() ) );
3451                         }
3452                 }
3453
3454                 # Copyright
3455                 if ( $this->copyrightUrl !== null ) {
3456                         $copyright = $this->copyrightUrl;
3457                 } else {
3458                         $copyright = '';
3459                         if ( $config->get( 'RightsPage' ) ) {
3460                                 $copy = Title::newFromText( $config->get( 'RightsPage' ) );
3461
3462                                 if ( $copy ) {
3463                                         $copyright = $copy->getLocalURL();
3464                                 }
3465                         }
3466
3467                         if ( !$copyright && $config->get( 'RightsUrl' ) ) {
3468                                 $copyright = $config->get( 'RightsUrl' );
3469                         }
3470                 }
3471
3472                 if ( $copyright ) {
3473                         $tags['copyright'] = Html::element( 'link', array(
3474                                 'rel' => 'copyright',
3475                                 'href' => $copyright )
3476                         );
3477                 }
3478
3479                 # Feeds
3480                 if ( $config->get( 'Feed' ) ) {
3481                         $feedLinks = array();
3482
3483                         foreach ( $this->getSyndicationLinks() as $format => $link ) {
3484                                 # Use the page name for the title.  In principle, this could
3485                                 # lead to issues with having the same name for different feeds
3486                                 # corresponding to the same page, but we can't avoid that at
3487                                 # this low a level.
3488
3489                                 $feedLinks[] = $this->feedLink(
3490                                         $format,
3491                                         $link,
3492                                         # Used messages: 'page-rss-feed' and 'page-atom-feed' (for an easier grep)
3493                                         $this->msg(
3494                                                 "page-{$format}-feed", $this->getTitle()->getPrefixedText()
3495                                         )->text()
3496                                 );
3497                         }
3498
3499                         # Recent changes feed should appear on every page (except recentchanges,
3500                         # that would be redundant). Put it after the per-page feed to avoid
3501                         # changing existing behavior. It's still available, probably via a
3502                         # menu in your browser. Some sites might have a different feed they'd
3503                         # like to promote instead of the RC feed (maybe like a "Recent New Articles"
3504                         # or "Breaking news" one). For this, we see if $wgOverrideSiteFeed is defined.
3505                         # If so, use it instead.
3506                         $sitename = $config->get( 'Sitename' );
3507                         if ( $config->get( 'OverrideSiteFeed' ) ) {
3508                                 foreach ( $config->get( 'OverrideSiteFeed' ) as $type => $feedUrl ) {
3509                                         // Note, this->feedLink escapes the url.
3510                                         $feedLinks[] = $this->feedLink(
3511                                                 $type,
3512                                                 $feedUrl,
3513                                                 $this->msg( "site-{$type}-feed", $sitename )->text()
3514                                         );
3515                                 }
3516                         } elseif ( !$this->getTitle()->isSpecial( 'Recentchanges' ) ) {
3517                                 $rctitle = SpecialPage::getTitleFor( 'Recentchanges' );
3518                                 foreach ( $config->get( 'AdvertisedFeedTypes' ) as $format ) {
3519                                         $feedLinks[] = $this->feedLink(
3520                                                 $format,
3521                                                 $rctitle->getLocalURL( array( 'feed' => $format ) ),
3522                                                 # For grep: 'site-rss-feed', 'site-atom-feed'
3523                                                 $this->msg( "site-{$format}-feed", $sitename )->text()
3524                                         );
3525                                 }
3526                         }
3527
3528                         # Allow extensions to change the list pf feeds. This hook is primarily for changing,
3529                         # manipulating or removing existing feed tags. If you want to add new feeds, you should
3530                         # use OutputPage::addFeedLink() instead.
3531                         Hooks::run( 'AfterBuildFeedLinks', array( &$feedLinks ) );
3532
3533                         $tags += $feedLinks;
3534                 }
3535
3536                 # Canonical URL
3537                 if ( $config->get( 'EnableCanonicalServerLink' ) ) {
3538                         if ( $canonicalUrl !== false ) {
3539                                 $canonicalUrl = wfExpandUrl( $canonicalUrl, PROTO_CANONICAL );
3540                         } else {
3541                                 if ( $this->isArticleRelated() ) {
3542                                         // This affects all requests where "setArticleRelated" is true. This is
3543                                         // typically all requests that show content (query title, curid, oldid, diff),
3544                                         // and all wikipage actions (edit, delete, purge, info, history etc.).
3545                                         // It does not apply to File pages and Special pages.
3546                                         // 'history' and 'info' actions address page metadata rather than the page
3547                                         // content itself, so they may not be canonicalized to the view page url.
3548                                         // TODO: this ought to be better encapsulated in the Action class.
3549                                         $action = Action::getActionName( $this->getContext() );
3550                                         if ( in_array( $action, array( 'history', 'info' ) ) ) {
3551                                                 $query = "action={$action}";
3552                                         } else {
3553                                                 $query = '';
3554                                         }
3555                                         $canonicalUrl = $this->getTitle()->getCanonicalURL( $query );
3556                                 } else {
3557                                         $reqUrl = $this->getRequest()->getRequestURL();
3558                                         $canonicalUrl = wfExpandUrl( $reqUrl, PROTO_CANONICAL );
3559                                 }
3560                         }
3561                 }
3562                 if ( $canonicalUrl !== false ) {
3563                         $tags[] = Html::element( 'link', array(
3564                                 'rel' => 'canonical',
3565                                 'href' => $canonicalUrl
3566                         ) );
3567                 }
3568
3569                 return $tags;
3570         }
3571
3572         /**
3573          * @return string HTML tag links to be put in the header.
3574          * @deprecated since 1.24 Use OutputPage::headElement or if you have to,
3575          *   OutputPage::getHeadLinksArray directly.
3576          */
3577         public function getHeadLinks() {
3578                 wfDeprecated( __METHOD__, '1.24' );
3579                 return implode( "\n", $this->getHeadLinksArray() );
3580         }
3581
3582         /**
3583          * Generate a "<link rel/>" for a feed.
3584          *
3585          * @param string $type Feed type
3586          * @param string $url URL to the feed
3587          * @param string $text Value of the "title" attribute
3588          * @return string HTML fragment
3589          */
3590         private function feedLink( $type, $url, $text ) {
3591                 return Html::element( 'link', array(
3592                         'rel' => 'alternate',
3593                         'type' => "application/$type+xml",
3594                         'title' => $text,
3595                         'href' => $url )
3596                 );
3597         }
3598
3599         /**
3600          * Add a local or specified stylesheet, with the given media options.
3601          * Internal use only. Use OutputPage::addModuleStyles() if possible.
3602          *
3603          * @param string $style URL to the file
3604          * @param string $media To specify a media type, 'screen', 'printable', 'handheld' or any.
3605          * @param string $condition For IE conditional comments, specifying an IE version
3606          * @param string $dir Set to 'rtl' or 'ltr' for direction-specific sheets
3607          */
3608         public function addStyle( $style, $media = '', $condition = '', $dir = '' ) {
3609                 $options = array();
3610                 // Even though we expect the media type to be lowercase, but here we
3611                 // force it to lowercase to be safe.
3612                 if ( $media ) {
3613                         $options['media'] = $media;
3614                 }
3615                 if ( $condition ) {
3616                         $options['condition'] = $condition;
3617                 }
3618                 if ( $dir ) {
3619                         $options['dir'] = $dir;
3620                 }
3621                 $this->styles[$style] = $options;
3622         }
3623
3624         /**
3625          * Adds inline CSS styles
3626          * Internal use only. Use OutputPage::addModuleStyles() if possible.
3627          *
3628          * @param mixed $style_css Inline CSS
3629          * @param string $flip Set to 'flip' to flip the CSS if needed
3630          */
3631         public function addInlineStyle( $style_css, $flip = 'noflip' ) {
3632                 if ( $flip === 'flip' && $this->getLanguage()->isRTL() ) {
3633                         # If wanted, and the interface is right-to-left, flip the CSS
3634                         $style_css = CSSJanus::transform( $style_css, true, false );
3635                 }
3636                 $this->mInlineStyles .= Html::inlineStyle( $style_css ) . "\n";
3637         }
3638
3639         /**
3640          * Build a set of "<link>" elements for the stylesheets specified in the $this->styles array.
3641          * These will be applied to various media & IE conditionals.
3642          *
3643          * @return string
3644          */
3645         public function buildCssLinks() {
3646                 global $wgContLang;
3647
3648                 $this->getSkin()->setupSkinUserCss( $this );
3649
3650                 // Add ResourceLoader styles
3651                 // Split the styles into these groups
3652                 $styles = array(
3653                         'other' => array(),
3654                         'user' => array(),
3655                         'site' => array(),
3656                         'private' => array(),
3657                         'noscript' => array()
3658                 );
3659                 $links = array();
3660                 $otherTags = array(); // Tags to append after the normal <link> tags
3661                 $resourceLoader = $this->getResourceLoader();
3662
3663                 $moduleStyles = $this->getModuleStyles();
3664
3665                 // Per-site custom styles
3666                 $moduleStyles[] = 'site';
3667                 $moduleStyles[] = 'noscript';
3668                 $moduleStyles[] = 'user.groups';
3669
3670                 // Per-user custom styles
3671                 if ( $this->getConfig()->get( 'AllowUserCss' ) && $this->getTitle()->isCssSubpage()
3672                         && $this->userCanPreview()
3673                 ) {
3674                         // We're on a preview of a CSS subpage
3675                         // Exclude this page from the user module in case it's in there (bug 26283)
3676                         $link = $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_STYLES,
3677                                 array( 'excludepage' => $this->getTitle()->getPrefixedDBkey() )
3678                         );
3679                         $otherTags = array_merge( $otherTags, $link['html'] );
3680
3681                         // Load the previewed CSS
3682                         // If needed, Janus it first. This is user-supplied CSS, so it's
3683                         // assumed to be right for the content language directionality.
3684                         $previewedCSS = $this->getRequest()->getText( 'wpTextbox1' );
3685                         if ( $this->getLanguage()->getDir() !== $wgContLang->getDir() ) {
3686                                 $previewedCSS = CSSJanus::transform( $previewedCSS, true, false );
3687                         }
3688                         $otherTags[] = Html::inlineStyle( $previewedCSS ) . "\n";
3689                 } else {
3690                         // Load the user styles normally
3691                         $moduleStyles[] = 'user';
3692                 }
3693
3694                 // Per-user preference styles
3695                 $moduleStyles[] = 'user.cssprefs';
3696
3697                 foreach ( $moduleStyles as $name ) {
3698                         $module = $resourceLoader->getModule( $name );
3699                         if ( !$module ) {
3700                                 continue;
3701                         }
3702                         if ( $name === 'site' ) {
3703                                 // HACK: The site module shouldn't be fragmented with a cache group and
3704                                 // http request. But in order to ensure its styles are separated and after the
3705                                 // ResourceLoaderDynamicStyles marker, pretend it is in a group called 'site'.
3706                                 // The scripts remain ungrouped and rides the bottom queue.
3707                                 $styles['site'][] = $name;
3708                                 continue;
3709                         }
3710                         $group = $module->getGroup();
3711                         // Modules in groups other than the ones needing special treatment
3712                         // (see $styles assignment)
3713                         // will be placed in the "other" style category.
3714                         $styles[isset( $styles[$group] ) ? $group : 'other'][] = $name;
3715                 }
3716
3717                 // We want site, private and user styles to override dynamically added
3718                 // styles from modules, but we want dynamically added styles to override
3719                 // statically added styles from other modules. So the order has to be
3720                 // other, dynamic, site, private, user. Add statically added styles for
3721                 // other modules
3722                 $links[] = $this->makeResourceLoaderLink(
3723                         $styles['other'],
3724                         ResourceLoaderModule::TYPE_STYLES
3725                 );
3726                 // Add normal styles added through addStyle()/addInlineStyle() here
3727                 $links[] = implode( "\n", $this->buildCssLinksArray() ) . $this->mInlineStyles;
3728                 // Add marker tag to mark the place where the client-side
3729                 // loader should inject dynamic styles
3730                 // We use a <meta> tag with a made-up name for this because that's valid HTML
3731                 $links[] = Html::element(
3732                         'meta',
3733                         array( 'name' => 'ResourceLoaderDynamicStyles', 'content' => '' )
3734                 );
3735
3736                 // Add site-specific and user-specific styles
3737                 // 'private' at present only contains user.options, so put that before 'user'
3738                 // Any future private modules will likely have a similar user-specific character
3739                 foreach ( array( 'site', 'noscript', 'private', 'user' ) as $group ) {
3740                         $links[] = $this->makeResourceLoaderLink( $styles[$group],
3741                                 ResourceLoaderModule::TYPE_STYLES
3742                         );
3743                 }
3744
3745                 // Add stuff in $otherTags (previewed user CSS if applicable)
3746                 return self::getHtmlFromLoaderLinks( $links ) . implode( '', $otherTags );
3747         }
3748
3749         /**
3750          * @return array
3751          */
3752         public function buildCssLinksArray() {
3753                 $links = array();
3754
3755                 // Add any extension CSS
3756                 foreach ( $this->mExtStyles as $url ) {
3757                         $this->addStyle( $url );
3758                 }
3759                 $this->mExtStyles = array();
3760
3761                 foreach ( $this->styles as $file => $options ) {
3762                         $link = $this->styleLink( $file, $options );
3763                         if ( $link ) {
3764                                 $links[$file] = $link;
3765                         }
3766                 }
3767                 return $links;
3768         }
3769
3770         /**
3771          * Generate \<link\> tags for stylesheets
3772          *
3773          * @param string $style URL to the file
3774          * @param array $options Option, can contain 'condition', 'dir', 'media' keys
3775          * @return string HTML fragment
3776          */
3777         protected function styleLink( $style, array $options ) {
3778                 if ( isset( $options['dir'] ) ) {
3779                         if ( $this->getLanguage()->getDir() != $options['dir'] ) {
3780                                 return '';
3781                         }
3782                 }
3783
3784                 if ( isset( $options['media'] ) ) {
3785                         $media = self::transformCssMedia( $options['media'] );
3786                         if ( is_null( $media ) ) {
3787                                 return '';
3788                         }
3789                 } else {
3790                         $media = 'all';
3791                 }
3792
3793                 if ( substr( $style, 0, 1 ) == '/' ||
3794                         substr( $style, 0, 5 ) == 'http:' ||
3795                         substr( $style, 0, 6 ) == 'https:' ) {
3796                         $url = $style;
3797                 } else {
3798                         $config = $this->getConfig();
3799                         $url = $config->get( 'StylePath' ) . '/' . $style . '?' .
3800                                 $config->get( 'StyleVersion' );
3801                 }
3802
3803                 $link = Html::linkedStyle( $url, $media );
3804
3805                 if ( isset( $options['condition'] ) ) {
3806                         $condition = htmlspecialchars( $options['condition'] );
3807                         $link = "<!--[if $condition]>$link<![endif]-->";
3808                 }
3809                 return $link;
3810         }
3811
3812         /**
3813          * Transform "media" attribute based on request parameters
3814          *
3815          * @param string $media Current value of the "media" attribute
3816          * @return string Modified value of the "media" attribute, or null to skip
3817          * this stylesheet
3818          */
3819         public static function transformCssMedia( $media ) {
3820                 global $wgRequest;
3821
3822                 // http://www.w3.org/TR/css3-mediaqueries/#syntax
3823                 $screenMediaQueryRegex = '/^(?:only\s+)?screen\b/i';
3824
3825                 // Switch in on-screen display for media testing
3826                 $switches = array(
3827                         'printable' => 'print',
3828                         'handheld' => 'handheld',
3829                 );
3830                 foreach ( $switches as $switch => $targetMedia ) {
3831                         if ( $wgRequest->getBool( $switch ) ) {
3832                                 if ( $media == $targetMedia ) {
3833                                         $media = '';
3834                                 } elseif ( preg_match( $screenMediaQueryRegex, $media ) === 1 ) {
3835                                         /* This regex will not attempt to understand a comma-separated media_query_list
3836                                          *
3837                                          * Example supported values for $media:
3838                                          * 'screen', 'only screen', 'screen and (min-width: 982px)' ),
3839                                          * Example NOT supported value for $media:
3840                                          * '3d-glasses, screen, print and resolution > 90dpi'
3841                                          *
3842                                          * If it's a print request, we never want any kind of screen stylesheets
3843                                          * If it's a handheld request (currently the only other choice with a switch),
3844                                          * we don't want simple 'screen' but we might want screen queries that
3845                                          * have a max-width or something, so we'll pass all others on and let the
3846                                          * client do the query.
3847                                          */
3848                                         if ( $targetMedia == 'print' || $media == 'screen' ) {
3849                                                 return null;
3850                                         }
3851                                 }
3852                         }
3853                 }
3854
3855                 return $media;
3856         }
3857
3858         /**
3859          * Add a wikitext-formatted message to the output.
3860          * This is equivalent to:
3861          *
3862          *    $wgOut->addWikiText( wfMessage( ... )->plain() )
3863          */
3864         public function addWikiMsg( /*...*/ ) {
3865                 $args = func_get_args();
3866                 $name = array_shift( $args );
3867                 $this->addWikiMsgArray( $name, $args );
3868         }
3869
3870         /**
3871          * Add a wikitext-formatted message to the output.
3872          * Like addWikiMsg() except the parameters are taken as an array
3873          * instead of a variable argument list.
3874          *
3875          * @param string $name
3876          * @param array $args
3877          */
3878         public function addWikiMsgArray( $name, $args ) {
3879                 $this->addHTML( $this->msg( $name, $args )->parseAsBlock() );
3880         }
3881
3882         /**
3883          * This function takes a number of message/argument specifications, wraps them in
3884          * some overall structure, and then parses the result and adds it to the output.
3885          *
3886          * In the $wrap, $1 is replaced with the first message, $2 with the second,
3887          * and so on. The subsequent arguments may be either
3888          * 1) strings, in which case they are message names, or
3889          * 2) arrays, in which case, within each array, the first element is the message
3890          *    name, and subsequent elements are the parameters to that message.
3891          *
3892          * Don't use this for messages that are not in the user's interface language.
3893          *
3894          * For example:
3895          *
3896          *    $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>", 'some-error' );
3897          *
3898          * Is equivalent to:
3899          *
3900          *    $wgOut->addWikiText( "<div class='error'>\n"
3901          *        . wfMessage( 'some-error' )->plain() . "\n</div>" );
3902          *
3903          * The newline after the opening div is needed in some wikitext. See bug 19226.
3904          *
3905          * @param string $wrap
3906          */
3907         public function wrapWikiMsg( $wrap /*, ...*/ ) {
3908                 $msgSpecs = func_get_args();
3909                 array_shift( $msgSpecs );
3910                 $msgSpecs = array_values( $msgSpecs );
3911                 $s = $wrap;
3912                 foreach ( $msgSpecs as $n => $spec ) {
3913                         if ( is_array( $spec ) ) {
3914                                 $args = $spec;
3915                                 $name = array_shift( $args );
3916                                 if ( isset( $args['options'] ) ) {
3917                                         unset( $args['options'] );
3918                                         wfDeprecated(
3919                                                 'Adding "options" to ' . __METHOD__ . ' is no longer supported',
3920                                                 '1.20'
3921                                         );
3922                                 }
3923                         } else {
3924                                 $args = array();
3925                                 $name = $spec;
3926                         }
3927                         $s = str_replace( '$' . ( $n + 1 ), $this->msg( $name, $args )->plain(), $s );
3928                 }
3929                 $this->addWikiText( $s );
3930         }
3931
3932         /**
3933          * Enables/disables TOC, doesn't override __NOTOC__
3934          * @param bool $flag
3935          * @since 1.22
3936          */
3937         public function enableTOC( $flag = true ) {
3938                 $this->mEnableTOC = $flag;
3939         }
3940
3941         /**
3942          * @return bool
3943          * @since 1.22
3944          */
3945         public function isTOCEnabled() {
3946                 return $this->mEnableTOC;
3947         }
3948
3949         /**
3950          * Enables/disables section edit links, doesn't override __NOEDITSECTION__
3951          * @param bool $flag
3952          * @since 1.23
3953          */
3954         public function enableSectionEditLinks( $flag = true ) {
3955                 $this->mEnableSectionEditLinks = $flag;
3956         }
3957
3958         /**
3959          * @return bool
3960          * @since 1.23
3961          */
3962         public function sectionEditLinksEnabled() {
3963                 return $this->mEnableSectionEditLinks;
3964         }
3965
3966         /**
3967          * Helper function to setup the PHP implementation of OOUI to use in this request.
3968          *
3969          * @since 1.26
3970          * @param String $skinName The Skin name to determine the correct OOUI theme
3971          * @param String $dir Language direction
3972          */
3973         public static function setupOOUI( $skinName = '', $dir = 'ltr' ) {
3974                 $themes = ExtensionRegistry::getInstance()->getAttribute( 'SkinOOUIThemes' );
3975                 // Make keys (skin names) lowercase for case-insensitive matching.
3976                 $themes = array_change_key_case( $themes, CASE_LOWER );
3977                 $theme = isset( $themes[$skinName] ) ? $themes[$skinName] : 'MediaWiki';
3978                 // For example, 'OOUI\MediaWikiTheme'.
3979                 $themeClass = "OOUI\\{$theme}Theme";
3980                 OOUI\Theme::setSingleton( new $themeClass() );
3981                 OOUI\Element::setDefaultDir( $dir );
3982         }
3983
3984         /**
3985          * Add ResourceLoader module styles for OOUI and set up the PHP implementation of it for use with
3986          * MediaWiki and this OutputPage instance.
3987          *
3988          * @since 1.25
3989          */
3990         public function enableOOUI() {
3991                 self::setupOOUI(
3992                         strtolower( $this->getSkin()->getSkinName() ),
3993                         $this->getLanguage()->getDir()
3994                 );
3995                 $this->addModuleStyles( array(
3996                         'oojs-ui.styles',
3997                         'oojs-ui.styles.icons',
3998                         'oojs-ui.styles.indicators',
3999                         'oojs-ui.styles.textures',
4000                         'mediawiki.widgets.styles',
4001                 ) );
4002         }
4003 }