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
  25 /**
  26  * This class should be covered by a general architecture document which does
  27  * not exist as of January 2011.  This is one of the Core classes and should
  28  * be read at least once by any new developers.
  29  *
  30  * This class is used to prepare the final rendering. A skin is then
  31  * applied to the output parameters (links, javascript, html, categories ...).
  32  *
  33  * @todo FIXME: Another class handles sending the whole page to the client.
  34  *
  35  * Some comments comes from a pairing session between Zak Greant and Antoine Musso
  36  * in November 2010.
  37  *
  38  * @todo document
  39  */
  40 class OutputPage extends ContextSource {
  41         /** @var array Should be private. Used with addMeta() which adds "<meta>" */
  42         protected $mMetatags = array();
  43
  44         /** @var array */
  45         protected $mLinktags = array();
  46
  47         /** @var bool */
  48         protected $mCanonicalUrl = false;
  49
  50         /**
  51          * @var array Additional stylesheets. Looks like this is for extensions.
  52          *   Might be replaced by resource loader.
  53          */
  54         protected $mExtStyles = array();
  55
  56         /**
  57          * @var string Should be private - has getter and setter. Contains
  58          *   the HTML title */
  59         public $mPagetitle = '';
  60
  61         /**
  62          * @var string Contains all of the "<body>" content. Should be private we
  63          *   got set/get accessors and the append() method.
  64          */
  65         public $mBodytext = '';
  66
  67         /**
  68          * Holds the debug lines that will be output as comments in page source if
  69          * $wgDebugComments is enabled. See also $wgShowDebug.
  70          * @deprecated since 1.20; use MWDebug class instead.
  71          */
  72         public $mDebugtext = '';
  73
  74         /** @var string Stores contents of "<title>" tag */
  75         private $mHTMLtitle = '';
  76
  77         /**
  78          * @var bool Is the displayed content related to the source of the
  79          *   corresponding wiki article.
  80          */
  81         private $mIsarticle = false;
  82
  83         /** @var bool Stores "article flag" toggle. */
  84         private $mIsArticleRelated = true;
  85
  86         /**
  87          * @var bool We have to set isPrintable(). Some pages should
  88          * never be printed (ex: redirections).
  89          */
  90         private $mPrintable = false;
  91
  92         /**
  93          * @var array Contains the page subtitle. Special pages usually have some
  94          *   links here. Don't confuse with site subtitle added by skins.
  95          */
  96         private $mSubtitle = array();
  97
  98         /** @var string */
  99         public $mRedirect = '';
 100
 101         /** @var int */
 102         protected $mStatusCode;
 103
 104         /**
 105          * @var string Variable mLastModified and mEtag are used for sending cache control.
 106          *   The whole caching system should probably be moved into its own class.
 107          */
 108         protected $mLastModified = '';
 109
 110         /**
 111          * Contains an HTTP Entity Tags (see RFC 2616 section 3.13) which is used
 112          * as a unique identifier for the content. It is later used by the client
 113          * to compare its cached version with the server version. Client sends
 114          * headers If-Match and If-None-Match containing its locally cached ETAG value.
 115          *
 116          * To get more information, you will have to look at HTTP/1.1 protocol which
 117          * is properly described in RFC 2616 : http://tools.ietf.org/html/rfc2616
 118          */
 119         private $mETag = false;
 120
 121         /** @var array */
 122         protected $mCategoryLinks = array();
 123
 124         /** @var array */
 125         protected $mCategories = array();
 126
 127         /** @var array */
 128         protected $mIndicators = array();
 129
 130         /** @var array Array of Interwiki Prefixed (non DB key) Titles (e.g. 'fr:Test page') */
 131         private $mLanguageLinks = array();
 132
 133         /**
 134          * Used for JavaScript (pre resource loader)
 135          * @todo We should split JS / CSS.
 136          * mScripts content is inserted as is in "<head>" by Skin. This might
 137          * contain either a link to a stylesheet or inline CSS.
 138          */
 139         private $mScripts = '';
 140
 141         /** @var string Inline CSS styles. Use addInlineStyle() sparingly */
 142         protected $mInlineStyles = '';
 143
 144         /** @todo Unused? */
 145         private $mLinkColours;
 146
 147         /**
 148          * @var string Used by skin template.
 149          * Example: $tpl->set( 'displaytitle', $out->mPageLinkTitle );
 150          */
 151         public $mPageLinkTitle = '';
 152
 153         /** @var array Array of elements in "<head>". Parser might add its own headers! */
 154         protected $mHeadItems = array();
 155
 156         // @todo FIXME: Next 5 variables probably come from the resource loader
 157
 158         /** @var array */
 159         protected $mModules = array();
 160
 161         /** @var array */
 162         protected $mModuleScripts = array();
 163
 164         /** @var array */
 165         protected $mModuleStyles = array();
 166
 167         /** @var ResourceLoader */
 168         protected $mResourceLoader;
 169
 170         /** @var array */
 171         protected $mJsConfigVars = array();
 172
 173         /** @var array */
 174         protected $mTemplateIds = array();
 175
 176         /** @var array */
 177         protected $mImageTimeKeys = array();
 178
 179         /** @var string */
 180         public $mRedirectCode = '';
 181
 182         protected $mFeedLinksAppendQuery = null;
 183
 184         /** @var array
 185          * What level of 'untrustworthiness' is allowed in CSS/JS modules loaded on this page?
 186          * @see ResourceLoaderModule::$origin
 187          * ResourceLoaderModule::ORIGIN_ALL is assumed unless overridden;
 188          */
 189         protected $mAllowedModules = array(
 190                 ResourceLoaderModule::TYPE_COMBINED => ResourceLoaderModule::ORIGIN_ALL,
 191         );
 192
 193         /** @var bool Whether output is disabled.  If this is true, the 'output' method will do nothing. */
 194         protected $mDoNothing = false;
 195
 196         // Parser related.
 197
 198         /** @var int */
 199         protected $mContainsNewMagic = 0;
 200
 201         /**
 202          * lazy initialised, use parserOptions()
 203          * @var ParserOptions
 204          */
 205         protected $mParserOptions = null;
 206
 207         /**
 208          * Handles the Atom / RSS links.
 209          * We probably only support Atom in 2011.
 210          * @see $wgAdvertisedFeedTypes
 211          */
 212         private $mFeedLinks = array();
 213
 214         // Gwicke work on squid caching? Roughly from 2003.
 215         protected $mEnableClientCache = true;
 216
 217         /** @var bool Flag if output should only contain the body of the article. */
 218         private $mArticleBodyOnly = false;
 219
 220         /** @var bool */
 221         protected $mNewSectionLink = false;
 222
 223         /** @var bool */
 224         protected $mHideNewSectionLink = false;
 225
 226         /**
 227          * @var bool Comes from the parser. This was probably made to load CSS/JS
 228          * only if we had "<gallery>". Used directly in CategoryPage.php.
 229          * Looks like resource loader can replace this.
 230          */
 231         public $mNoGallery = false;
 232
 233         /** @var string */
 234         private $mPageTitleActionText = '';
 235
 236         /** @var array */
 237         private $mParseWarnings = array();
 238
 239         /** @var int Cache stuff. Looks like mEnableClientCache */
 240         protected $mSquidMaxage = 0;
 241
 242         /**
 243          * @var bool Controls if anti-clickjacking / frame-breaking headers will
 244          * be sent. This should be done for pages where edit actions are possible.
 245          * Setters: $this->preventClickjacking() and $this->allowClickjacking().
 246          */
 247         protected $mPreventClickjacking = true;
 248
 249         /** @var int To include the variable {{REVISIONID}} */
 250         private $mRevisionId = null;
 251
 252         /** @var string */
 253         private $mRevisionTimestamp = null;
 254
 255         /** @var array */
 256         protected $mFileVersion = null;
 257
 258         /**
 259          * @var array An array of stylesheet filenames (relative from skins path),
 260          * with options for CSS media, IE conditions, and RTL/LTR direction.
 261          * For internal use; add settings in the skin via $this->addStyle()
 262          *
 263          * Style again! This seems like a code duplication since we already have
 264          * mStyles. This is what makes Open Source amazing.
 265          */
 266         protected $styles = array();
 267
 268         /**
 269          * Whether jQuery is already handled.
 270          */
 271         protected $mJQueryDone = false;
 272
 273         private $mIndexPolicy = 'index';
 274         private $mFollowPolicy = 'follow';
 275         private $mVaryHeader = array(
 276                 'Accept-Encoding' => array( 'list-contains=gzip' ),
 277         );
 278
 279         /**
 280          * If the current page was reached through a redirect, $mRedirectedFrom contains the Title
 281          * of the redirect.
 282          *
 283          * @var Title
 284          */
 285         private $mRedirectedFrom = null;
 286
 287         /**
 288          * Additional key => value data
 289          */
 290         private $mProperties = array();
 291
 292         /**
 293          * @var string|null ResourceLoader target for load.php links. If null, will be omitted
 294          */
 295         private $mTarget = null;
 296
 297         /**
 298          * @var bool Whether parser output should contain table of contents
 299          */
 300         private $mEnableTOC = true;
 301
 302         /**
 303          * @var bool Whether parser output should contain section edit links
 304          */
 305         private $mEnableSectionEditLinks = true;
 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 HTTP status code to send with the output.
 345          *
 346          * @param int $statusCode
 347          */
 348         public function setStatusCode( $statusCode ) {
 349                 $this->mStatusCode = $statusCode;
 350         }
 351
 352         /**
 353          * Add a new "<meta>" tag
 354          * To add an http-equiv meta tag, precede the name with "http:"
 355          *
 356          * @param string $name Tag name
 357          * @param string $val Tag value
 358          */
 359         function addMeta( $name, $val ) {
 360                 array_push( $this->mMetatags, array( $name, $val ) );
 361         }
 362
 363         /**
 364          * Returns the current <meta> tags
 365          *
 366          * @since 1.25
 367          * @return array
 368          */
 369         public function getMetaTags() {
 370                 return $this->mMetatags;
 371         }
 372
 373         /**
 374          * Add a new \<link\> tag to the page header.
 375          *
 376          * Note: use setCanonicalUrl() for rel=canonical.
 377          *
 378          * @param array $linkarr Associative array of attributes.
 379          */
 380         function addLink( array $linkarr ) {
 381                 array_push( $this->mLinktags, $linkarr );
 382         }
 383
 384         /**
 385          * Returns the current <link> tags
 386          *
 387          * @since 1.25
 388          * @return array
 389          */
 390         public function getLinkTags() {
 391                 return $this->mLinktags;
 392         }
 393
 394         /**
 395          * Add a new \<link\> with "rel" attribute set to "meta"
 396          *
 397          * @param array $linkarr Associative array mapping attribute names to their
 398          *                 values, both keys and values will be escaped, and the
 399          *                 "rel" attribute will be automatically added
 400          */
 401         function addMetadataLink( array $linkarr ) {
 402                 $linkarr['rel'] = $this->getMetadataAttribute();
 403                 $this->addLink( $linkarr );
 404         }
 405
 406         /**
 407          * Set the URL to be used for the <link rel=canonical>. This should be used
 408          * in preference to addLink(), to avoid duplicate link tags.
 409          * @param string $url
 410          */
 411         function setCanonicalUrl( $url ) {
 412                 $this->mCanonicalUrl = $url;
 413         }
 414
 415         /**
 416          * Returns the URL to be used for the <link rel=canonical> if
 417          * one is set.
 418          *
 419          * @since 1.25
 420          * @return bool|string
 421          */
 422         public function getCanonicalUrl() {
 423                 return $this->mCanonicalUrl;
 424         }
 425
 426         /**
 427          * Get the value of the "rel" attribute for metadata links
 428          *
 429          * @return string
 430          */
 431         public function getMetadataAttribute() {
 432                 # note: buggy CC software only reads first "meta" link
 433                 static $haveMeta = false;
 434                 if ( $haveMeta ) {
 435                         return 'alternate meta';
 436                 } else {
 437                         $haveMeta = true;
 438                         return 'meta';
 439                 }
 440         }
 441
 442         /**
 443          * Add raw HTML to the list of scripts (including \<script\> tag, etc.)
 444          *
 445          * @param string $script Raw HTML
 446          */
 447         function addScript( $script ) {
 448                 $this->mScripts .= $script . "\n";
 449         }
 450
 451         /**
 452          * Register and add a stylesheet from an extension directory.
 453          *
 454          * @param string $url Path to sheet.  Provide either a full url (beginning
 455          *             with 'http', etc) or a relative path from the document root
 456          *             (beginning with '/').  Otherwise it behaves identically to
 457          *             addStyle() and draws from the /skins folder.
 458          */
 459         public function addExtensionStyle( $url ) {
 460                 array_push( $this->mExtStyles, $url );
 461         }
 462
 463         /**
 464          * Get all styles added by extensions
 465          *
 466          * @return array
 467          */
 468         function getExtStyle() {
 469                 return $this->mExtStyles;
 470         }
 471
 472         /**
 473          * Add a JavaScript file out of skins/common, or a given relative path.
 474          *
 475          * @param string $file Filename in skins/common or complete on-server path
 476          *              (/foo/bar.js)
 477          * @param string $version Style version of the file. Defaults to $wgStyleVersion
 478          */
 479         public function addScriptFile( $file, $version = null ) {
 480                 // See if $file parameter is an absolute URL or begins with a slash
 481                 if ( substr( $file, 0, 1 ) == '/' || preg_match( '#^[a-z]*://#i', $file ) ) {
 482                         $path = $file;
 483                 } else {
 484                         $path = $this->getConfig()->get( 'StylePath' ) . "/common/{$file}";
 485                 }
 486                 if ( is_null( $version ) ) {
 487                         $version = $this->getConfig()->get( 'StyleVersion' );
 488                 }
 489                 $this->addScript( Html::linkedScript( wfAppendQuery( $path, $version ) ) );
 490         }
 491
 492         /**
 493          * Add a self-contained script tag with the given contents
 494          *
 495          * @param string $script JavaScript text, no "<script>" tags
 496          */
 497         public function addInlineScript( $script ) {
 498                 $this->mScripts .= Html::inlineScript( "\n$script\n" ) . "\n";
 499         }
 500
 501         /**
 502          * Get all registered JS and CSS tags for the header.
 503          *
 504          * @return string
 505          * @deprecated since 1.24 Use OutputPage::headElement to build the full header.
 506          */
 507         function getScript() {
 508                 wfDeprecated( __METHOD__, '1.24' );
 509                 return $this->mScripts . $this->getHeadItems();
 510         }
 511
 512         /**
 513          * Filter an array of modules to remove insufficiently trustworthy members, and modules
 514          * which are no longer registered (eg a page is cached before an extension is disabled)
 515          * @param array $modules
 516          * @param string|null $position If not null, only return modules with this position
 517          * @param string $type
 518          * @return array
 519          */
 520         protected function filterModules( array $modules, $position = null,
 521                 $type = ResourceLoaderModule::TYPE_COMBINED
 522         ) {
 523                 $resourceLoader = $this->getResourceLoader();
 524                 $filteredModules = array();
 525                 foreach ( $modules as $val ) {
 526                         $module = $resourceLoader->getModule( $val );
 527                         if ( $module instanceof ResourceLoaderModule
 528                                 && $module->getOrigin() <= $this->getAllowedModules( $type )
 529                                 && ( is_null( $position ) || $module->getPosition() == $position )
 530                                 && ( !$this->mTarget || in_array( $this->mTarget, $module->getTargets() ) )
 531                         ) {
 532                                 $filteredModules[] = $val;
 533                         }
 534                 }
 535                 return $filteredModules;
 536         }
 537
 538         /**
 539          * Get the list of modules to include on this page
 540          *
 541          * @param bool $filter Whether to filter out insufficiently trustworthy modules
 542          * @param string|null $position If not null, only return modules with this position
 543          * @param string $param
 544          * @return array Array of module names
 545          */
 546         public function getModules( $filter = false, $position = null, $param = 'mModules' ) {
 547                 $modules = array_values( array_unique( $this->$param ) );
 548                 return $filter
 549                         ? $this->filterModules( $modules, $position )
 550                         : $modules;
 551         }
 552
 553         /**
 554          * Add one or more modules recognized by the resource loader. Modules added
 555          * through this function will be loaded by the resource loader when the
 556          * page loads.
 557          *
 558          * @param string|array $modules Module name (string) or array of module names
 559          */
 560         public function addModules( $modules ) {
 561                 $this->mModules = array_merge( $this->mModules, (array)$modules );
 562         }
 563
 564         /**
 565          * Get the list of module JS to include on this page
 566          *
 567          * @param bool $filter
 568          * @param string|null $position
 569          *
 570          * @return array Array of module names
 571          */
 572         public function getModuleScripts( $filter = false, $position = null ) {
 573                 return $this->getModules( $filter, $position, 'mModuleScripts' );
 574         }
 575
 576         /**
 577          * Add only JS of one or more modules recognized by the resource loader. Module
 578          * scripts added through this function will be loaded by the resource loader when
 579          * the page loads.
 580          *
 581          * @param string|array $modules Module name (string) or array of module names
 582          */
 583         public function addModuleScripts( $modules ) {
 584                 $this->mModuleScripts = array_merge( $this->mModuleScripts, (array)$modules );
 585         }
 586
 587         /**
 588          * Get the list of module CSS to include on this page
 589          *
 590          * @param bool $filter
 591          * @param string|null $position
 592          *
 593          * @return array Array of module names
 594          */
 595         public function getModuleStyles( $filter = false, $position = null ) {
 596                 // T97420
 597                 $resourceLoader = $this->getResourceLoader();
 598
 599                 foreach ( $this->mModuleStyles as $val ) {
 600                         $module = $resourceLoader->getModule( $val );
 601
 602                         if ( $module instanceof ResourceLoaderModule && $module->isPositionDefault() ) {
 603                                 $warning = __METHOD__ . ': style module should define its position explicitly: ' . $val . ' ' . get_class( $module );
 604                                 wfDebugLog( 'resourceloader', $warning );
 605                                 wfLogWarning( $warning );
 606                         }
 607                 }
 608
 609                 return $this->getModules( $filter, $position, 'mModuleStyles' );
 610         }
 611
 612         /**
 613          * Add only CSS of one or more modules recognized by the resource loader.
 614          *
 615          * Module styles added through this function will be added using standard link CSS
 616          * tags, rather than as a combined Javascript and CSS package. Thus, they will
 617          * load when JavaScript is disabled (unless CSS also happens to be disabled).
 618          *
 619          * @param string|array $modules Module name (string) or array of module names
 620          */
 621         public function addModuleStyles( $modules ) {
 622                 $this->mModuleStyles = array_merge( $this->mModuleStyles, (array)$modules );
 623         }
 624
 625         /**
 626          * Get the list of module messages to include on this page
 627          *
 628          * @deprecated since 1.26 Obsolete
 629          * @param bool $filter
 630          * @param string|null $position
 631          * @return array Array of module names
 632          */
 633         public function getModuleMessages( $filter = false, $position = null ) {
 634                 wfDeprecated( __METHOD__, '1.26' );
 635                 return array();
 636         }
 637
 638         /**
 639          * Load messages of one or more ResourceLoader modules.
 640          *
 641          * @deprecated since 1.26 Use addModules() instead
 642          * @param string|array $modules Module name (string) or array of module names
 643          */
 644         public function addModuleMessages( $modules ) {
 645                 wfDeprecated( __METHOD__, '1.26' );
 646         }
 647
 648         /**
 649          * @return null|string ResourceLoader target
 650          */
 651         public function getTarget() {
 652                 return $this->mTarget;
 653         }
 654
 655         /**
 656          * Sets ResourceLoader target for load.php links. If null, will be omitted
 657          *
 658          * @param string|null $target
 659          */
 660         public function setTarget( $target ) {
 661                 $this->mTarget = $target;
 662         }
 663
 664         /**
 665          * Get an array of head items
 666          *
 667          * @return array
 668          */
 669         function getHeadItemsArray() {
 670                 return $this->mHeadItems;
 671         }
 672
 673         /**
 674          * Get all header items in a string
 675          *
 676          * @return string
 677          * @deprecated since 1.24 Use OutputPage::headElement or
 678          *   if absolutely necessary use OutputPage::getHeadItemsArray
 679          */
 680         function getHeadItems() {
 681                 wfDeprecated( __METHOD__, '1.24' );
 682                 $s = '';
 683                 foreach ( $this->mHeadItems as $item ) {
 684                         $s .= $item;
 685                 }
 686                 return $s;
 687         }
 688
 689         /**
 690          * Add or replace an header item to the output
 691          *
 692          * @param string $name Item name
 693          * @param string $value Raw HTML
 694          */
 695         public function addHeadItem( $name, $value ) {
 696                 $this->mHeadItems[$name] = $value;
 697         }
 698
 699         /**
 700          * Check if the header item $name is already set
 701          *
 702          * @param string $name Item name
 703          * @return bool
 704          */
 705         public function hasHeadItem( $name ) {
 706                 return isset( $this->mHeadItems[$name] );
 707         }
 708
 709         /**
 710          * Set the value of the ETag HTTP header, only used if $wgUseETag is true
 711          *
 712          * @param string $tag Value of "ETag" header
 713          */
 714         function setETag( $tag ) {
 715                 $this->mETag = $tag;
 716         }
 717
 718         /**
 719          * Set whether the output should only contain the body of the article,
 720          * without any skin, sidebar, etc.
 721          * Used e.g. when calling with "action=render".
 722          *
 723          * @param bool $only Whether to output only the body of the article
 724          */
 725         public function setArticleBodyOnly( $only ) {
 726                 $this->mArticleBodyOnly = $only;
 727         }
 728
 729         /**
 730          * Return whether the output will contain only the body of the article
 731          *
 732          * @return bool
 733          */
 734         public function getArticleBodyOnly() {
 735                 return $this->mArticleBodyOnly;
 736         }
 737
 738         /**
 739          * Set an additional output property
 740          * @since 1.21
 741          *
 742          * @param string $name
 743          * @param mixed $value
 744          */
 745         public function setProperty( $name, $value ) {
 746                 $this->mProperties[$name] = $value;
 747         }
 748
 749         /**
 750          * Get an additional output property
 751          * @since 1.21
 752          *
 753          * @param string $name
 754          * @return mixed Property value or null if not found
 755          */
 756         public function getProperty( $name ) {
 757                 if ( isset( $this->mProperties[$name] ) ) {
 758                         return $this->mProperties[$name];
 759                 } else {
 760                         return null;
 761                 }
 762         }
 763
 764         /**
 765          * checkLastModified tells the client to use the client-cached page if
 766          * possible. If successful, the OutputPage is disabled so that
 767          * any future call to OutputPage->output() have no effect.
 768          *
 769          * Side effect: sets mLastModified for Last-Modified header
 770          *
 771          * @param string $timestamp
 772          *
 773          * @return bool True if cache-ok headers was sent.
 774          */
 775         public function checkLastModified( $timestamp ) {
 776                 if ( !$timestamp || $timestamp == '19700101000000' ) {
 777                         wfDebug( __METHOD__ . ": CACHE DISABLED, NO TIMESTAMP\n" );
 778                         return false;
 779                 }
 780                 $config = $this->getConfig();
 781                 if ( !$config->get( 'CachePages' ) ) {
 782                         wfDebug( __METHOD__ . ": CACHE DISABLED\n" );
 783                         return false;
 784                 }
 785
 786                 $timestamp = wfTimestamp( TS_MW, $timestamp );
 787                 $modifiedTimes = array(
 788                         'page' => $timestamp,
 789                         'user' => $this->getUser()->getTouched(),
 790                         'epoch' => $config->get( 'CacheEpoch' )
 791                 );
 792                 if ( $config->get( 'UseSquid' ) ) {
 793                         // bug 44570: the core page itself may not change, but resources might
 794                         $modifiedTimes['sepoch'] = wfTimestamp( TS_MW, time() - $config->get( 'SquidMaxage' ) );
 795                 }
 796                 Hooks::run( 'OutputPageCheckLastModified', array( &$modifiedTimes ) );
 797
 798                 $maxModified = max( $modifiedTimes );
 799                 $this->mLastModified = wfTimestamp( TS_RFC2822, $maxModified );
 800
 801                 $clientHeader = $this->getRequest()->getHeader( 'If-Modified-Since' );
 802                 if ( $clientHeader === false ) {
 803                         wfDebug( __METHOD__ . ": client did not send If-Modified-Since header\n", 'log' );
 804                         return false;
 805                 }
 806
 807                 # IE sends sizes after the date like this:
 808                 # Wed, 20 Aug 2003 06:51:19 GMT; length=5202
 809                 # this breaks strtotime().
 810                 $clientHeader = preg_replace( '/;.*$/', '', $clientHeader );
 811
 812                 wfSuppressWarnings(); // E_STRICT system time bitching
 813                 $clientHeaderTime = strtotime( $clientHeader );
 814                 wfRestoreWarnings();
 815                 if ( !$clientHeaderTime ) {
 816                         wfDebug( __METHOD__
 817                                 . ": unable to parse the client's If-Modified-Since header: $clientHeader\n" );
 818                         return false;
 819                 }
 820                 $clientHeaderTime = wfTimestamp( TS_MW, $clientHeaderTime );
 821
 822                 # Make debug info
 823                 $info = '';
 824                 foreach ( $modifiedTimes as $name => $value ) {
 825                         if ( $info !== '' ) {
 826                                 $info .= ', ';
 827                         }
 828                         $info .= "$name=" . wfTimestamp( TS_ISO_8601, $value );
 829                 }
 830
 831                 wfDebug( __METHOD__ . ": client sent If-Modified-Since: " .
 832                         wfTimestamp( TS_ISO_8601, $clientHeaderTime ) . "\n", 'log' );
 833                 wfDebug( __METHOD__ . ": effective Last-Modified: " .
 834                         wfTimestamp( TS_ISO_8601, $maxModified ) . "\n", 'log' );
 835                 if ( $clientHeaderTime < $maxModified ) {
 836                         wfDebug( __METHOD__ . ": STALE, $info\n", 'log' );
 837                         return false;
 838                 }
 839
 840                 # Not modified
 841                 # Give a 304 response code and disable body output
 842                 wfDebug( __METHOD__ . ": NOT MODIFIED, $info\n", 'log' );
 843                 ini_set( 'zlib.output_compression', 0 );
 844                 $this->getRequest()->response()->header( "HTTP/1.1 304 Not Modified" );
 845                 $this->sendCacheControl();
 846                 $this->disable();
 847
 848                 // Don't output a compressed blob when using ob_gzhandler;
 849                 // it's technically against HTTP spec and seems to confuse
 850                 // Firefox when the response gets split over two packets.
 851                 wfClearOutputBuffers();
 852
 853                 return true;
 854         }
 855
 856         /**
 857          * Override the last modified timestamp
 858          *
 859          * @param string $timestamp New timestamp, in a format readable by
 860          *        wfTimestamp()
 861          */
 862         public function setLastModified( $timestamp ) {
 863                 $this->mLastModified = wfTimestamp( TS_RFC2822, $timestamp );
 864         }
 865
 866         /**
 867          * Set the robot policy for the page: <http://www.robotstxt.org/meta.html>
 868          *
 869          * @param string $policy The literal string to output as the contents of
 870          *   the meta tag.  Will be parsed according to the spec and output in
 871          *   standardized form.
 872          * @return null
 873          */
 874         public function setRobotPolicy( $policy ) {
 875                 $policy = Article::formatRobotPolicy( $policy );
 876
 877                 if ( isset( $policy['index'] ) ) {
 878                         $this->setIndexPolicy( $policy['index'] );
 879                 }
 880                 if ( isset( $policy['follow'] ) ) {
 881                         $this->setFollowPolicy( $policy['follow'] );
 882                 }
 883         }
 884
 885         /**
 886          * Set the index policy for the page, but leave the follow policy un-
 887          * touched.
 888          *
 889          * @param string $policy Either 'index' or 'noindex'.
 890          * @return null
 891          */
 892         public function setIndexPolicy( $policy ) {
 893                 $policy = trim( $policy );
 894                 if ( in_array( $policy, array( 'index', 'noindex' ) ) ) {
 895                         $this->mIndexPolicy = $policy;
 896                 }
 897         }
 898
 899         /**
 900          * Set the follow policy for the page, but leave the index policy un-
 901          * touched.
 902          *
 903          * @param string $policy Either 'follow' or 'nofollow'.
 904          * @return null
 905          */
 906         public function setFollowPolicy( $policy ) {
 907                 $policy = trim( $policy );
 908                 if ( in_array( $policy, array( 'follow', 'nofollow' ) ) ) {
 909                         $this->mFollowPolicy = $policy;
 910                 }
 911         }
 912
 913         /**
 914          * Set the new value of the "action text", this will be added to the
 915          * "HTML title", separated from it with " - ".
 916          *
 917          * @param string $text New value of the "action text"
 918          */
 919         public function setPageTitleActionText( $text ) {
 920                 $this->mPageTitleActionText = $text;
 921         }
 922
 923         /**
 924          * Get the value of the "action text"
 925          *
 926          * @return string
 927          */
 928         public function getPageTitleActionText() {
 929                 return $this->mPageTitleActionText;
 930         }
 931
 932         /**
 933          * "HTML title" means the contents of "<title>".
 934          * It is stored as plain, unescaped text and will be run through htmlspecialchars in the skin file.
 935          *
 936          * @param string|Message $name
 937          */
 938         public function setHTMLTitle( $name ) {
 939                 if ( $name instanceof Message ) {
 940                         $this->mHTMLtitle = $name->setContext( $this->getContext() )->text();
 941                 } else {
 942                         $this->mHTMLtitle = $name;
 943                 }
 944         }
 945
 946         /**
 947          * Return the "HTML title", i.e. the content of the "<title>" tag.
 948          *
 949          * @return string
 950          */
 951         public function getHTMLTitle() {
 952                 return $this->mHTMLtitle;
 953         }
 954
 955         /**
 956          * Set $mRedirectedFrom, the Title of the page which redirected us to the current page.
 957          *
 958          * @param Title $t
 959          */
 960         public function setRedirectedFrom( $t ) {
 961                 $this->mRedirectedFrom = $t;
 962         }
 963
 964         /**
 965          * "Page title" means the contents of \<h1\>. It is stored as a valid HTML
 966          * fragment. This function allows good tags like \<sup\> in the \<h1\> tag,
 967          * but not bad tags like \<script\>. This function automatically sets
 968          * \<title\> to the same content as \<h1\> but with all tags removed. Bad
 969          * tags that were escaped in \<h1\> will still be escaped in \<title\>, and
 970          * good tags like \<i\> will be dropped entirely.
 971          *
 972          * @param string|Message $name
 973          */
 974         public function setPageTitle( $name ) {
 975                 if ( $name instanceof Message ) {
 976                         $name = $name->setContext( $this->getContext() )->text();
 977                 }
 978
 979                 # change "<script>foo&bar</script>" to "&lt;script&gt;foo&amp;bar&lt;/script&gt;"
 980                 # but leave "<i>foobar</i>" alone
 981                 $nameWithTags = Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags( $name ) );
 982                 $this->mPagetitle = $nameWithTags;
 983
 984                 # change "<i>foo&amp;bar</i>" to "foo&bar"
 985                 $this->setHTMLTitle(
 986                         $this->msg( 'pagetitle' )->rawParams( Sanitizer::stripAllTags( $nameWithTags ) )
 987                                 ->inContentLanguage()
 988                 );
 989         }
 990
 991         /**
 992          * Return the "page title", i.e. the content of the \<h1\> tag.
 993          *
 994          * @return string
 995          */
 996         public function getPageTitle() {
 997                 return $this->mPagetitle;
 998         }
 999
1000         /**
1001          * Set the Title object to use
1002          *
1003          * @param Title $t
1004          */
1005         public function setTitle( Title $t ) {
1006                 $this->getContext()->setTitle( $t );
1007         }
1008
1009         /**
1010          * Replace the subtitle with $str
1011          *
1012          * @param string|Message $str New value of the subtitle. String should be safe HTML.
1013          */
1014         public function setSubtitle( $str ) {
1015                 $this->clearSubtitle();
1016                 $this->addSubtitle( $str );
1017         }
1018
1019         /**
1020          * Add $str to the subtitle
1021          *
1022          * @deprecated since 1.19; use addSubtitle() instead
1023          * @param string|Message $str String or Message to add to the subtitle
1024          */
1025         public function appendSubtitle( $str ) {
1026                 $this->addSubtitle( $str );
1027         }
1028
1029         /**
1030          * Add $str to the subtitle
1031          *
1032          * @param string|Message $str String or Message to add to the subtitle. String should be safe HTML.
1033          */
1034         public function addSubtitle( $str ) {
1035                 if ( $str instanceof Message ) {
1036                         $this->mSubtitle[] = $str->setContext( $this->getContext() )->parse();
1037                 } else {
1038                         $this->mSubtitle[] = $str;
1039                 }
1040         }
1041
1042         /**
1043          * Build message object for a subtitle containing a backlink to a page
1044          *
1045          * @param Title $title Title to link to
1046          * @param array $query Array of additional parameters to include in the link
1047          * @return Message
1048          * @since 1.25
1049          */
1050         public static function buildBacklinkSubtitle( Title $title, $query = array() ) {
1051                 if ( $title->isRedirect() ) {
1052                         $query['redirect'] = 'no';
1053                 }
1054                 return wfMessage( 'backlinksubtitle' )
1055                         ->rawParams( Linker::link( $title, null, array(), $query ) );
1056         }
1057
1058         /**
1059          * Add a subtitle containing a backlink to a page
1060          *
1061          * @param Title $title Title to link to
1062          * @param array $query Array of additional parameters to include in the link
1063          */
1064         public function addBacklinkSubtitle( Title $title, $query = array() ) {
1065                 $this->addSubtitle( self::buildBacklinkSubtitle( $title, $query ) );
1066         }
1067
1068         /**
1069          * Clear the subtitles
1070          */
1071         public function clearSubtitle() {
1072                 $this->mSubtitle = array();
1073         }
1074
1075         /**
1076          * Get the subtitle
1077          *
1078          * @return string
1079          */
1080         public function getSubtitle() {
1081                 return implode( "<br />\n\t\t\t\t", $this->mSubtitle );
1082         }
1083
1084         /**
1085          * Set the page as printable, i.e. it'll be displayed with all
1086          * print styles included
1087          */
1088         public function setPrintable() {
1089                 $this->mPrintable = true;
1090         }
1091
1092         /**
1093          * Return whether the page is "printable"
1094          *
1095          * @return bool
1096          */
1097         public function isPrintable() {
1098                 return $this->mPrintable;
1099         }
1100
1101         /**
1102          * Disable output completely, i.e. calling output() will have no effect
1103          */
1104         public function disable() {
1105                 $this->mDoNothing = true;
1106         }
1107
1108         /**
1109          * Return whether the output will be completely disabled
1110          *
1111          * @return bool
1112          */
1113         public function isDisabled() {
1114                 return $this->mDoNothing;
1115         }
1116
1117         /**
1118          * Show an "add new section" link?
1119          *
1120          * @return bool
1121          */
1122         public function showNewSectionLink() {
1123                 return $this->mNewSectionLink;
1124         }
1125
1126         /**
1127          * Forcibly hide the new section link?
1128          *
1129          * @return bool
1130          */
1131         public function forceHideNewSectionLink() {
1132                 return $this->mHideNewSectionLink;
1133         }
1134
1135         /**
1136          * Add or remove feed links in the page header
1137          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
1138          * for the new version
1139          * @see addFeedLink()
1140          *
1141          * @param bool $show True: add default feeds, false: remove all feeds
1142          */
1143         public function setSyndicated( $show = true ) {
1144                 if ( $show ) {
1145                         $this->setFeedAppendQuery( false );
1146                 } else {
1147                         $this->mFeedLinks = array();
1148                 }
1149         }
1150
1151         /**
1152          * Add default feeds to the page header
1153          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
1154          * for the new version
1155          * @see addFeedLink()
1156          *
1157          * @param string $val Query to append to feed links or false to output
1158          *        default links
1159          */
1160         public function setFeedAppendQuery( $val ) {
1161                 $this->mFeedLinks = array();
1162
1163                 foreach ( $this->getConfig()->get( 'AdvertisedFeedTypes' ) as $type ) {
1164                         $query = "feed=$type";
1165                         if ( is_string( $val ) ) {
1166                                 $query .= '&' . $val;
1167                         }
1168                         $this->mFeedLinks[$type] = $this->getTitle()->getLocalURL( $query );
1169                 }
1170         }
1171
1172         /**
1173          * Add a feed link to the page header
1174          *
1175          * @param string $format Feed type, should be a key of $wgFeedClasses
1176          * @param string $href URL
1177          */
1178         public function addFeedLink( $format, $href ) {
1179                 if ( in_array( $format, $this->getConfig()->get( 'AdvertisedFeedTypes' ) ) ) {
1180                         $this->mFeedLinks[$format] = $href;
1181                 }
1182         }
1183
1184         /**
1185          * Should we output feed links for this page?
1186          * @return bool
1187          */
1188         public function isSyndicated() {
1189                 return count( $this->mFeedLinks ) > 0;
1190         }
1191
1192         /**
1193          * Return URLs for each supported syndication format for this page.
1194          * @return array Associating format keys with URLs
1195          */
1196         public function getSyndicationLinks() {
1197                 return $this->mFeedLinks;
1198         }
1199
1200         /**
1201          * Will currently always return null
1202          *
1203          * @return null
1204          */
1205         public function getFeedAppendQuery() {
1206                 return $this->mFeedLinksAppendQuery;
1207         }
1208
1209         /**
1210          * Set whether the displayed content is related to the source of the
1211          * corresponding article on the wiki
1212          * Setting true will cause the change "article related" toggle to true
1213          *
1214          * @param bool $v
1215          */
1216         public function setArticleFlag( $v ) {
1217                 $this->mIsarticle = $v;
1218                 if ( $v ) {
1219                         $this->mIsArticleRelated = $v;
1220                 }
1221         }
1222
1223         /**
1224          * Return whether the content displayed page is related to the source of
1225          * the corresponding article on the wiki
1226          *
1227          * @return bool
1228          */
1229         public function isArticle() {
1230                 return $this->mIsarticle;
1231         }
1232
1233         /**
1234          * Set whether this page is related an article on the wiki
1235          * Setting false will cause the change of "article flag" toggle to false
1236          *
1237          * @param bool $v
1238          */
1239         public function setArticleRelated( $v ) {
1240                 $this->mIsArticleRelated = $v;
1241                 if ( !$v ) {
1242                         $this->mIsarticle = false;
1243                 }
1244         }
1245
1246         /**
1247          * Return whether this page is related an article on the wiki
1248          *
1249          * @return bool
1250          */
1251         public function isArticleRelated() {
1252                 return $this->mIsArticleRelated;
1253         }
1254
1255         /**
1256          * Add new language links
1257          *
1258          * @param array $newLinkArray Associative array mapping language code to the page
1259          *                      name
1260          */
1261         public function addLanguageLinks( array $newLinkArray ) {
1262                 $this->mLanguageLinks += $newLinkArray;
1263         }
1264
1265         /**
1266          * Reset the language links and add new language links
1267          *
1268          * @param array $newLinkArray Associative array mapping language code to the page
1269          *                      name
1270          */
1271         public function setLanguageLinks( array $newLinkArray ) {
1272                 $this->mLanguageLinks = $newLinkArray;
1273         }
1274
1275         /**
1276          * Get the list of language links
1277          *
1278          * @return array Array of Interwiki Prefixed (non DB key) Titles (e.g. 'fr:Test page')
1279          */
1280         public function getLanguageLinks() {
1281                 return $this->mLanguageLinks;
1282         }
1283
1284         /**
1285          * Add an array of categories, with names in the keys
1286          *
1287          * @param array $categories Mapping category name => sort key
1288          */
1289         public function addCategoryLinks( array $categories ) {
1290                 global $wgContLang;
1291
1292                 if ( !is_array( $categories ) || count( $categories ) == 0 ) {
1293                         return;
1294                 }
1295
1296                 # Add the links to a LinkBatch
1297                 $arr = array( NS_CATEGORY => $categories );
1298                 $lb = new LinkBatch;
1299                 $lb->setArray( $arr );
1300
1301                 # Fetch existence plus the hiddencat property
1302                 $dbr = wfGetDB( DB_SLAVE );
1303                 $fields = array( 'page_id', 'page_namespace', 'page_title', 'page_len',
1304                         'page_is_redirect', 'page_latest', 'pp_value' );
1305
1306                 if ( $this->getConfig()->get( 'ContentHandlerUseDB' ) ) {
1307                         $fields[] = 'page_content_model';
1308                 }
1309
1310                 $res = $dbr->select( array( 'page', 'page_props' ),
1311                         $fields,
1312                         $lb->constructSet( 'page', $dbr ),
1313                         __METHOD__,
1314                         array(),
1315                         array( 'page_props' => array( 'LEFT JOIN', array(
1316                                 'pp_propname' => 'hiddencat',
1317                                 'pp_page = page_id'
1318                         ) ) )
1319                 );
1320
1321                 # Add the results to the link cache
1322                 $lb->addResultToCache( LinkCache::singleton(), $res );
1323
1324                 # Set all the values to 'normal'.
1325                 $categories = array_fill_keys( array_keys( $categories ), 'normal' );
1326
1327                 # Mark hidden categories
1328                 foreach ( $res as $row ) {
1329                         if ( isset( $row->pp_value ) ) {
1330                                 $categories[$row->page_title] = 'hidden';
1331                         }
1332                 }
1333
1334                 # Add the remaining categories to the skin
1335                 if ( Hooks::run(
1336                         'OutputPageMakeCategoryLinks',
1337                         array( &$this, $categories, &$this->mCategoryLinks ) )
1338                 ) {
1339                         foreach ( $categories as $category => $type ) {
1340                                 $origcategory = $category;
1341                                 $title = Title::makeTitleSafe( NS_CATEGORY, $category );
1342                                 if ( !$title ) {
1343                                         continue;
1344                                 }
1345                                 $wgContLang->findVariantLink( $category, $title, true );
1346                                 if ( $category != $origcategory && array_key_exists( $category, $categories ) ) {
1347                                         continue;
1348                                 }
1349                                 $text = $wgContLang->convertHtml( $title->getText() );
1350                                 $this->mCategories[] = $title->getText();
1351                                 $this->mCategoryLinks[$type][] = Linker::link( $title, $text );
1352                         }
1353                 }
1354         }
1355
1356         /**
1357          * Reset the category links (but not the category list) and add $categories
1358          *
1359          * @param array $categories Mapping category name => sort key
1360          */
1361         public function setCategoryLinks( array $categories ) {
1362                 $this->mCategoryLinks = array();
1363                 $this->addCategoryLinks( $categories );
1364         }
1365
1366         /**
1367          * Get the list of category links, in a 2-D array with the following format:
1368          * $arr[$type][] = $link, where $type is either "normal" or "hidden" (for
1369          * hidden categories) and $link a HTML fragment with a link to the category
1370          * page
1371          *
1372          * @return array
1373          */
1374         public function getCategoryLinks() {
1375                 return $this->mCategoryLinks;
1376         }
1377
1378         /**
1379          * Get the list of category names this page belongs to
1380          *
1381          * @return array Array of strings
1382          */
1383         public function getCategories() {
1384                 return $this->mCategories;
1385         }
1386
1387         /**
1388          * Add an array of indicators, with their identifiers as array
1389          * keys and HTML contents as values.
1390          *
1391          * In case of duplicate keys, existing values are overwritten.
1392          *
1393          * @param array $indicators
1394          * @since 1.25
1395          */
1396         public function setIndicators( array $indicators ) {
1397                 $this->mIndicators = $indicators + $this->mIndicators;
1398                 // Keep ordered by key
1399                 ksort( $this->mIndicators );
1400         }
1401
1402         /**
1403          * Get the indicators associated with this page.
1404          *
1405          * The array will be internally ordered by item keys.
1406          *
1407          * @return array Keys: identifiers, values: HTML contents
1408          * @since 1.25
1409          */
1410         public function getIndicators() {
1411                 return $this->mIndicators;
1412         }
1413
1414         /**
1415          * Adds help link with an icon via page indicators.
1416          * Link target can be overridden by a local message containing a wikilink:
1417          * the message key is: lowercase action or special page name + '-helppage'.
1418          * @param string $to Target MediaWiki.org page title or encoded URL.
1419          * @param bool $overrideBaseUrl Whether $url is a full URL, to avoid MW.o.
1420          * @since 1.25
1421          */
1422         public function addHelpLink( $to, $overrideBaseUrl = false ) {
1423                 $this->addModuleStyles( 'mediawiki.helplink' );
1424                 $text = $this->msg( 'helppage-top-gethelp' )->escaped();
1425
1426                 if ( $overrideBaseUrl ) {
1427                         $helpUrl = $to;
1428                 } else {
1429                         $toUrlencoded = wfUrlencode( str_replace( ' ', '_', $to ) );
1430                         $helpUrl = "//www.mediawiki.org/wiki/Special:MyLanguage/$toUrlencoded";
1431                 }
1432
1433                 $link = Html::rawElement(
1434                         'a',
1435                         array(
1436                                 'href' => $helpUrl,
1437                                 'target' => '_blank',
1438                                 'class' => 'mw-helplink',
1439                         ),
1440                         $text
1441                 );
1442
1443                 $this->setIndicators( array( 'mw-helplink' => $link ) );
1444         }
1445
1446         /**
1447          * Do not allow scripts which can be modified by wiki users to load on this page;
1448          * only allow scripts bundled with, or generated by, the software.
1449          * Site-wide styles are controlled by a config setting, since they can be
1450          * used to create a custom skin/theme, but not user-specific ones.
1451          *
1452          * @todo this should be given a more accurate name
1453          */
1454         public function disallowUserJs() {
1455                 $this->reduceAllowedModules(
1456                         ResourceLoaderModule::TYPE_SCRIPTS,
1457                         ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL
1458                 );
1459
1460                 // Site-wide styles are controlled by a config setting, see bug 71621
1461                 // for background on why. User styles are never allowed.
1462                 if ( $this->getConfig()->get( 'AllowSiteCSSOnRestrictedPages' ) ) {
1463                         $styleOrigin = ResourceLoaderModule::ORIGIN_USER_SITEWIDE;
1464                 } else {
1465                         $styleOrigin = ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL;
1466                 }
1467                 $this->reduceAllowedModules(
1468                         ResourceLoaderModule::TYPE_STYLES,
1469                         $styleOrigin
1470                 );
1471         }
1472
1473         /**
1474          * Show what level of JavaScript / CSS untrustworthiness is allowed on this page
1475          * @see ResourceLoaderModule::$origin
1476          * @param string $type ResourceLoaderModule TYPE_ constant
1477          * @return int ResourceLoaderModule ORIGIN_ class constant
1478          */
1479         public function getAllowedModules( $type ) {
1480                 if ( $type == ResourceLoaderModule::TYPE_COMBINED ) {
1481                         return min( array_values( $this->mAllowedModules ) );
1482                 } else {
1483                         return isset( $this->mAllowedModules[$type] )
1484                                 ? $this->mAllowedModules[$type]
1485                                 : ResourceLoaderModule::ORIGIN_ALL;
1486                 }
1487         }
1488
1489         /**
1490          * Set the highest level of CSS/JS untrustworthiness allowed
1491          *
1492          * @deprecated since 1.24 Raising level of allowed untrusted content is no longer supported.
1493          *  Use reduceAllowedModules() instead
1494          * @param string $type ResourceLoaderModule TYPE_ constant
1495          * @param int $level ResourceLoaderModule class constant
1496          */
1497         public function setAllowedModules( $type, $level ) {
1498                 wfDeprecated( __METHOD__, '1.24' );
1499                 $this->reduceAllowedModules( $type, $level );
1500         }
1501
1502         /**
1503          * Limit the highest level of CSS/JS untrustworthiness allowed.
1504          *
1505          * If passed the same or a higher level than the current level of untrustworthiness set, the
1506          * level will remain unchanged.
1507          *
1508          * @param string $type
1509          * @param int $level ResourceLoaderModule class constant
1510          */
1511         public function reduceAllowedModules( $type, $level ) {
1512                 $this->mAllowedModules[$type] = min( $this->getAllowedModules( $type ), $level );
1513         }
1514
1515         /**
1516          * Prepend $text to the body HTML
1517          *
1518          * @param string $text HTML
1519          */
1520         public function prependHTML( $text ) {
1521                 $this->mBodytext = $text . $this->mBodytext;
1522         }
1523
1524         /**
1525          * Append $text to the body HTML
1526          *
1527          * @param string $text HTML
1528          */
1529         public function addHTML( $text ) {
1530                 $this->mBodytext .= $text;
1531         }
1532
1533         /**
1534          * Shortcut for adding an Html::element via addHTML.
1535          *
1536          * @since 1.19
1537          *
1538          * @param string $element
1539          * @param array $attribs
1540          * @param string $contents
1541          */
1542         public function addElement( $element, array $attribs = array(), $contents = '' ) {
1543                 $this->addHTML( Html::element( $element, $attribs, $contents ) );
1544         }
1545
1546         /**
1547          * Clear the body HTML
1548          */
1549         public function clearHTML() {
1550                 $this->mBodytext = '';
1551         }
1552
1553         /**
1554          * Get the body HTML
1555          *
1556          * @return string HTML
1557          */
1558         public function getHTML() {
1559                 return $this->mBodytext;
1560         }
1561
1562         /**
1563          * Get/set the ParserOptions object to use for wikitext parsing
1564          *
1565          * @param ParserOptions|null $options Either the ParserOption to use or null to only get the
1566          *   current ParserOption object
1567          * @return ParserOptions
1568          */
1569         public function parserOptions( $options = null ) {
1570                 if ( !$this->mParserOptions ) {
1571                         $this->mParserOptions = ParserOptions::newFromContext( $this->getContext() );
1572                         $this->mParserOptions->setEditSection( false );
1573                 }
1574                 return wfSetVar( $this->mParserOptions, $options );
1575         }
1576
1577         /**
1578          * Set the revision ID which will be seen by the wiki text parser
1579          * for things such as embedded {{REVISIONID}} variable use.
1580          *
1581          * @param int|null $revid An positive integer, or null
1582          * @return mixed Previous value
1583          */
1584         public function setRevisionId( $revid ) {
1585                 $val = is_null( $revid ) ? null : intval( $revid );
1586                 return wfSetVar( $this->mRevisionId, $val );
1587         }
1588
1589         /**
1590          * Get the displayed revision ID
1591          *
1592          * @return int
1593          */
1594         public function getRevisionId() {
1595                 return $this->mRevisionId;
1596         }
1597
1598         /**
1599          * Set the timestamp of the revision which will be displayed. This is used
1600          * to avoid a extra DB call in Skin::lastModified().
1601          *
1602          * @param string|null $timestamp
1603          * @return mixed Previous value
1604          */
1605         public function setRevisionTimestamp( $timestamp ) {
1606                 return wfSetVar( $this->mRevisionTimestamp, $timestamp );
1607         }
1608
1609         /**
1610          * Get the timestamp of displayed revision.
1611          * This will be null if not filled by setRevisionTimestamp().
1612          *
1613          * @return string|null
1614          */
1615         public function getRevisionTimestamp() {
1616                 return $this->mRevisionTimestamp;
1617         }
1618
1619         /**
1620          * Set the displayed file version
1621          *
1622          * @param File|bool $file
1623          * @return mixed Previous value
1624          */
1625         public function setFileVersion( $file ) {
1626                 $val = null;
1627                 if ( $file instanceof File && $file->exists() ) {
1628                         $val = array( 'time' => $file->getTimestamp(), 'sha1' => $file->getSha1() );
1629                 }
1630                 return wfSetVar( $this->mFileVersion, $val, true );
1631         }
1632
1633         /**
1634          * Get the displayed file version
1635          *
1636          * @return array|null ('time' => MW timestamp, 'sha1' => sha1)
1637          */
1638         public function getFileVersion() {
1639                 return $this->mFileVersion;
1640         }
1641
1642         /**
1643          * Get the templates used on this page
1644          *
1645          * @return array (namespace => dbKey => revId)
1646          * @since 1.18
1647          */
1648         public function getTemplateIds() {
1649                 return $this->mTemplateIds;
1650         }
1651
1652         /**
1653          * Get the files used on this page
1654          *
1655          * @return array (dbKey => array('time' => MW timestamp or null, 'sha1' => sha1 or ''))
1656          * @since 1.18
1657          */
1658         public function getFileSearchOptions() {
1659                 return $this->mImageTimeKeys;
1660         }
1661
1662         /**
1663          * Convert wikitext to HTML and add it to the buffer
1664          * Default assumes that the current page title will be used.
1665          *
1666          * @param string $text
1667          * @param bool $linestart Is this the start of a line?
1668          * @param bool $interface Is this text in the user interface language?
1669          * @throws MWException
1670          */
1671         public function addWikiText( $text, $linestart = true, $interface = true ) {
1672                 $title = $this->getTitle(); // Work around E_STRICT
1673                 if ( !$title ) {
1674                         throw new MWException( 'Title is null' );
1675                 }
1676                 $this->addWikiTextTitle( $text, $title, $linestart, /*tidy*/false, $interface );
1677         }
1678
1679         /**
1680          * Add wikitext with a custom Title object
1681          *
1682          * @param string $text Wikitext
1683          * @param Title $title
1684          * @param bool $linestart Is this the start of a line?
1685          */
1686         public function addWikiTextWithTitle( $text, &$title, $linestart = true ) {
1687                 $this->addWikiTextTitle( $text, $title, $linestart );
1688         }
1689
1690         /**
1691          * Add wikitext with a custom Title object and tidy enabled.
1692          *
1693          * @param string $text Wikitext
1694          * @param Title $title
1695          * @param bool $linestart Is this the start of a line?
1696          */
1697         function addWikiTextTitleTidy( $text, &$title, $linestart = true ) {
1698                 $this->addWikiTextTitle( $text, $title, $linestart, true );
1699         }
1700
1701         /**
1702          * Add wikitext with tidy enabled
1703          *
1704          * @param string $text Wikitext
1705          * @param bool $linestart Is this the start of a line?
1706          */
1707         public function addWikiTextTidy( $text, $linestart = true ) {
1708                 $title = $this->getTitle();
1709                 $this->addWikiTextTitleTidy( $text, $title, $linestart );
1710         }
1711
1712         /**
1713          * Add wikitext with a custom Title object
1714          *
1715          * @param string $text Wikitext
1716          * @param Title $title
1717          * @param bool $linestart Is this the start of a line?
1718          * @param bool $tidy Whether to use tidy
1719          * @param bool $interface Whether it is an interface message
1720          *   (for example disables conversion)
1721          */
1722         public function addWikiTextTitle( $text, Title $title, $linestart,
1723                 $tidy = false, $interface = false
1724         ) {
1725                 global $wgParser;
1726
1727                 $popts = $this->parserOptions();
1728                 $oldTidy = $popts->setTidy( $tidy );
1729                 $popts->setInterfaceMessage( (bool)$interface );
1730
1731                 $parserOutput = $wgParser->getFreshParser()->parse(
1732                         $text, $title, $popts,
1733                         $linestart, true, $this->mRevisionId
1734                 );
1735
1736                 $popts->setTidy( $oldTidy );
1737
1738                 $this->addParserOutput( $parserOutput );
1739
1740         }
1741
1742         /**
1743          * Add a ParserOutput object, but without Html.
1744          *
1745          * @deprecated since 1.24, use addParserOutputMetadata() instead.
1746          * @param ParserOutput $parserOutput
1747          */
1748         public function addParserOutputNoText( $parserOutput ) {
1749                 $this->addParserOutputMetadata( $parserOutput );
1750         }
1751
1752         /**
1753          * Add all metadata associated with a ParserOutput object, but without the actual HTML. This
1754          * includes categories, language links, ResourceLoader modules, effects of certain magic words,
1755          * and so on.
1756          *
1757          * @since 1.24
1758          * @param ParserOutput $parserOutput
1759          */
1760         public function addParserOutputMetadata( $parserOutput ) {
1761                 $this->mLanguageLinks += $parserOutput->getLanguageLinks();
1762                 $this->addCategoryLinks( $parserOutput->getCategories() );
1763                 $this->setIndicators( $parserOutput->getIndicators() );
1764                 $this->mNewSectionLink = $parserOutput->getNewSection();
1765                 $this->mHideNewSectionLink = $parserOutput->getHideNewSection();
1766
1767                 $this->mParseWarnings = $parserOutput->getWarnings();
1768                 if ( !$parserOutput->isCacheable() ) {
1769                         $this->enableClientCache( false );
1770                 }
1771                 $this->mNoGallery = $parserOutput->getNoGallery();
1772                 $this->mHeadItems = array_merge( $this->mHeadItems, $parserOutput->getHeadItems() );
1773                 $this->addModules( $parserOutput->getModules() );
1774                 $this->addModuleScripts( $parserOutput->getModuleScripts() );
1775                 $this->addModuleStyles( $parserOutput->getModuleStyles() );
1776                 $this->addJsConfigVars( $parserOutput->getJsConfigVars() );
1777                 $this->mPreventClickjacking = $this->mPreventClickjacking
1778                         || $parserOutput->preventClickjacking();
1779
1780                 // Template versioning...
1781                 foreach ( (array)$parserOutput->getTemplateIds() as $ns => $dbks ) {
1782                         if ( isset( $this->mTemplateIds[$ns] ) ) {
1783                                 $this->mTemplateIds[$ns] = $dbks + $this->mTemplateIds[$ns];
1784                         } else {
1785                                 $this->mTemplateIds[$ns] = $dbks;
1786                         }
1787                 }
1788                 // File versioning...
1789                 foreach ( (array)$parserOutput->getFileSearchOptions() as $dbk => $data ) {
1790                         $this->mImageTimeKeys[$dbk] = $data;
1791                 }
1792
1793                 // Hooks registered in the object
1794                 $parserOutputHooks = $this->getConfig()->get( 'ParserOutputHooks' );
1795                 foreach ( $parserOutput->getOutputHooks() as $hookInfo ) {
1796                         list( $hookName, $data ) = $hookInfo;
1797                         if ( isset( $parserOutputHooks[$hookName] ) ) {
1798                                 call_user_func( $parserOutputHooks[$hookName], $this, $parserOutput, $data );
1799                         }
1800                 }
1801
1802                 // Link flags are ignored for now, but may in the future be
1803                 // used to mark individual language links.
1804                 $linkFlags = array();
1805                 Hooks::run( 'LanguageLinks', array( $this->getTitle(), &$this->mLanguageLinks, &$linkFlags ) );
1806                 Hooks::run( 'OutputPageParserOutput', array( &$this, $parserOutput ) );
1807         }
1808
1809         /**
1810          * Add the HTML and enhancements for it (like ResourceLoader modules) associated with a
1811          * ParserOutput object, without any other metadata.
1812          *
1813          * @since 1.24
1814          * @param ParserOutput $parserOutput
1815          */
1816         public function addParserOutputContent( $parserOutput ) {
1817                 $this->addParserOutputText( $parserOutput );
1818
1819                 $this->addModules( $parserOutput->getModules() );
1820                 $this->addModuleScripts( $parserOutput->getModuleScripts() );
1821                 $this->addModuleStyles( $parserOutput->getModuleStyles() );
1822
1823                 $this->addJsConfigVars( $parserOutput->getJsConfigVars() );
1824         }
1825
1826         /**
1827          * Add the HTML associated with a ParserOutput object, without any metadata.
1828          *
1829          * @since 1.24
1830          * @param ParserOutput $parserOutput
1831          */
1832         public function addParserOutputText( $parserOutput ) {
1833                 $text = $parserOutput->getText();
1834                 Hooks::run( 'OutputPageBeforeHTML', array( &$this, &$text ) );
1835                 $this->addHTML( $text );
1836         }
1837
1838         /**
1839          * Add everything from a ParserOutput object.
1840          *
1841          * @param ParserOutput $parserOutput
1842          */
1843         function addParserOutput( $parserOutput ) {
1844                 $this->addParserOutputMetadata( $parserOutput );
1845                 $parserOutput->setTOCEnabled( $this->mEnableTOC );
1846
1847                 // Touch section edit links only if not previously disabled
1848                 if ( $parserOutput->getEditSectionTokens() ) {
1849                         $parserOutput->setEditSectionTokens( $this->mEnableSectionEditLinks );
1850                 }
1851
1852                 $this->addParserOutputText( $parserOutput );
1853         }
1854
1855         /**
1856          * Add the output of a QuickTemplate to the output buffer
1857          *
1858          * @param QuickTemplate $template
1859          */
1860         public function addTemplate( &$template ) {
1861                 $this->addHTML( $template->getHTML() );
1862         }
1863
1864         /**
1865          * Parse wikitext and return the HTML.
1866          *
1867          * @param string $text
1868          * @param bool $linestart Is this the start of a line?
1869          * @param bool $interface Use interface language ($wgLang instead of
1870          *   $wgContLang) while parsing language sensitive magic words like GRAMMAR and PLURAL.
1871          *   This also disables LanguageConverter.
1872          * @param Language $language Target language object, will override $interface
1873          * @throws MWException
1874          * @return string HTML
1875          */
1876         public function parse( $text, $linestart = true, $interface = false, $language = null ) {
1877                 global $wgParser;
1878
1879                 if ( is_null( $this->getTitle() ) ) {
1880                         throw new MWException( 'Empty $mTitle in ' . __METHOD__ );
1881                 }
1882
1883                 $popts = $this->parserOptions();
1884                 if ( $interface ) {
1885                         $popts->setInterfaceMessage( true );
1886                 }
1887                 if ( $language !== null ) {
1888                         $oldLang = $popts->setTargetLanguage( $language );
1889                 }
1890
1891                 $parserOutput = $wgParser->getFreshParser()->parse(
1892                         $text, $this->getTitle(), $popts,
1893                         $linestart, true, $this->mRevisionId
1894                 );
1895
1896                 if ( $interface ) {
1897                         $popts->setInterfaceMessage( false );
1898                 }
1899                 if ( $language !== null ) {
1900                         $popts->setTargetLanguage( $oldLang );
1901                 }
1902
1903                 return $parserOutput->getText();
1904         }
1905
1906         /**
1907          * Parse wikitext, strip paragraphs, and return the HTML.
1908          *
1909          * @param string $text
1910          * @param bool $linestart Is this the start of a line?
1911          * @param bool $interface Use interface language ($wgLang instead of
1912          *   $wgContLang) while parsing language sensitive magic
1913          *   words like GRAMMAR and PLURAL
1914          * @return string HTML
1915          */
1916         public function parseInline( $text, $linestart = true, $interface = false ) {
1917                 $parsed = $this->parse( $text, $linestart, $interface );
1918                 return Parser::stripOuterParagraph( $parsed );
1919         }
1920
1921         /**
1922          * Set the value of the "s-maxage" part of the "Cache-control" HTTP header
1923          *
1924          * @param int $maxage Maximum cache time on the Squid, in seconds.
1925          */
1926         public function setSquidMaxage( $maxage ) {
1927                 $this->mSquidMaxage = $maxage;
1928         }
1929
1930         /**
1931          * Use enableClientCache(false) to force it to send nocache headers
1932          *
1933          * @param bool $state
1934          *
1935          * @return bool
1936          */
1937         public function enableClientCache( $state ) {
1938                 return wfSetVar( $this->mEnableClientCache, $state );
1939         }
1940
1941         /**
1942          * Get the list of cookies that will influence on the cache
1943          *
1944          * @return array
1945          */
1946         function getCacheVaryCookies() {
1947                 static $cookies;
1948                 if ( $cookies === null ) {
1949                         $config = $this->getConfig();
1950                         $cookies = array_merge(
1951                                 array(
1952                                         $config->get( 'CookiePrefix' ) . 'Token',
1953                                         $config->get( 'CookiePrefix' ) . 'LoggedOut',
1954                                         "forceHTTPS",
1955                                         session_name()
1956                                 ),
1957                                 $config->get( 'CacheVaryCookies' )
1958                         );
1959                         Hooks::run( 'GetCacheVaryCookies', array( $this, &$cookies ) );
1960                 }
1961                 return $cookies;
1962         }
1963
1964         /**
1965          * Check if the request has a cache-varying cookie header
1966          * If it does, it's very important that we don't allow public caching
1967          *
1968          * @return bool
1969          */
1970         function haveCacheVaryCookies() {
1971                 $cookieHeader = $this->getRequest()->getHeader( 'cookie' );
1972                 if ( $cookieHeader === false ) {
1973                         return false;
1974                 }
1975                 $cvCookies = $this->getCacheVaryCookies();
1976                 foreach ( $cvCookies as $cookieName ) {
1977                         # Check for a simple string match, like the way squid does it
1978                         if ( strpos( $cookieHeader, $cookieName ) !== false ) {
1979                                 wfDebug( __METHOD__ . ": found $cookieName\n" );
1980                                 return true;
1981                         }
1982                 }
1983                 wfDebug( __METHOD__ . ": no cache-varying cookies found\n" );
1984                 return false;
1985         }
1986
1987         /**
1988          * Add an HTTP header that will influence on the cache
1989          *
1990          * @param string $header Header name
1991          * @param array|null $option
1992          * @todo FIXME: Document the $option parameter; it appears to be for
1993          *        X-Vary-Options but what format is acceptable?
1994          */
1995         public function addVaryHeader( $header, $option = null ) {
1996                 if ( !array_key_exists( $header, $this->mVaryHeader ) ) {
1997                         $this->mVaryHeader[$header] = (array)$option;
1998                 } elseif ( is_array( $option ) ) {
1999                         if ( is_array( $this->mVaryHeader[$header] ) ) {
2000                                 $this->mVaryHeader[$header] = array_merge( $this->mVaryHeader[$header], $option );
2001                         } else {
2002                                 $this->mVaryHeader[$header] = $option;
2003                         }
2004                 }
2005                 $this->mVaryHeader[$header] = array_unique( (array)$this->mVaryHeader[$header] );
2006         }
2007
2008         /**
2009          * Return a Vary: header on which to vary caches. Based on the keys of $mVaryHeader,
2010          * such as Accept-Encoding or Cookie
2011          *
2012          * @return string
2013          */
2014         public function getVaryHeader() {
2015                 return 'Vary: ' . join( ', ', array_keys( $this->mVaryHeader ) );
2016         }
2017
2018         /**
2019          * Get a complete X-Vary-Options header
2020          *
2021          * @return string
2022          */
2023         public function getXVO() {
2024                 $cvCookies = $this->getCacheVaryCookies();
2025
2026                 $cookiesOption = array();
2027                 foreach ( $cvCookies as $cookieName ) {
2028                         $cookiesOption[] = 'string-contains=' . $cookieName;
2029                 }
2030                 $this->addVaryHeader( 'Cookie', $cookiesOption );
2031
2032                 $headers = array();
2033                 foreach ( $this->mVaryHeader as $header => $option ) {
2034                         $newheader = $header;
2035                         if ( is_array( $option ) && count( $option ) > 0 ) {
2036                                 $newheader .= ';' . implode( ';', $option );
2037                         }
2038                         $headers[] = $newheader;
2039                 }
2040                 $xvo = 'X-Vary-Options: ' . implode( ',', $headers );
2041
2042                 return $xvo;
2043         }
2044
2045         /**
2046          * bug 21672: Add Accept-Language to Vary and XVO headers
2047          * if there's no 'variant' parameter existed in GET.
2048          *
2049          * For example:
2050          *   /w/index.php?title=Main_page should always be served; but
2051          *   /w/index.php?title=Main_page&variant=zh-cn should never be served.
2052          */
2053         function addAcceptLanguage() {
2054                 $title = $this->getTitle();
2055                 if ( !$title instanceof Title ) {
2056                         return;
2057                 }
2058
2059                 $lang = $title->getPageLanguage();
2060                 if ( !$this->getRequest()->getCheck( 'variant' ) && $lang->hasVariants() ) {
2061                         $variants = $lang->getVariants();
2062                         $aloption = array();
2063                         foreach ( $variants as $variant ) {
2064                                 if ( $variant === $lang->getCode() ) {
2065                                         continue;
2066                                 } else {
2067                                         $aloption[] = 'string-contains=' . $variant;
2068
2069                                         // IE and some other browsers use BCP 47 standards in
2070                                         // their Accept-Language header, like "zh-CN" or "zh-Hant".
2071                                         // We should handle these too.
2072                                         $variantBCP47 = wfBCP47( $variant );
2073                                         if ( $variantBCP47 !== $variant ) {
2074                                                 $aloption[] = 'string-contains=' . $variantBCP47;
2075                                         }
2076                                 }
2077                         }
2078                         $this->addVaryHeader( 'Accept-Language', $aloption );
2079                 }
2080         }
2081
2082         /**
2083          * Set a flag which will cause an X-Frame-Options header appropriate for
2084          * edit pages to be sent. The header value is controlled by
2085          * $wgEditPageFrameOptions.
2086          *
2087          * This is the default for special pages. If you display a CSRF-protected
2088          * form on an ordinary view page, then you need to call this function.
2089          *
2090          * @param bool $enable
2091          */
2092         public function preventClickjacking( $enable = true ) {
2093                 $this->mPreventClickjacking = $enable;
2094         }
2095
2096         /**
2097          * Turn off frame-breaking. Alias for $this->preventClickjacking(false).
2098          * This can be called from pages which do not contain any CSRF-protected
2099          * HTML form.
2100          */
2101         public function allowClickjacking() {
2102                 $this->mPreventClickjacking = false;
2103         }
2104
2105         /**
2106          * Get the prevent-clickjacking flag
2107          *
2108          * @since 1.24
2109          * @return bool
2110          */
2111         public function getPreventClickjacking() {
2112                 return $this->mPreventClickjacking;
2113         }
2114
2115         /**
2116          * Get the X-Frame-Options header value (without the name part), or false
2117          * if there isn't one. This is used by Skin to determine whether to enable
2118          * JavaScript frame-breaking, for clients that don't support X-Frame-Options.
2119          *
2120          * @return string
2121          */
2122         public function getFrameOptions() {
2123                 $config = $this->getConfig();
2124                 if ( $config->get( 'BreakFrames' ) ) {
2125                         return 'DENY';
2126                 } elseif ( $this->mPreventClickjacking && $config->get( 'EditPageFrameOptions' ) ) {
2127                         return $config->get( 'EditPageFrameOptions' );
2128                 }
2129                 return false;
2130         }
2131
2132         /**
2133          * Send cache control HTTP headers
2134          */
2135         public function sendCacheControl() {
2136                 $response = $this->getRequest()->response();
2137                 $config = $this->getConfig();
2138                 if ( $config->get( 'UseETag' ) && $this->mETag ) {
2139                         $response->header( "ETag: $this->mETag" );
2140                 }
2141
2142                 $this->addVaryHeader( 'Cookie' );
2143                 $this->addAcceptLanguage();
2144
2145                 # don't serve compressed data to clients who can't handle it
2146                 # maintain different caches for logged-in users and non-logged in ones
2147                 $response->header( $this->getVaryHeader() );
2148
2149                 if ( $config->get( 'UseXVO' ) ) {
2150                         # Add an X-Vary-Options header for Squid with Wikimedia patches
2151                         $response->header( $this->getXVO() );
2152                 }
2153
2154                 if ( $this->mEnableClientCache ) {
2155                         if (
2156                                 $config->get( 'UseSquid' ) && session_id() == '' && !$this->isPrintable() &&
2157                                 $this->mSquidMaxage != 0 && !$this->haveCacheVaryCookies()
2158                         ) {
2159                                 if ( $config->get( 'UseESI' ) ) {
2160                                         # We'll purge the proxy cache explicitly, but require end user agents
2161                                         # to revalidate against the proxy on each visit.
2162                                         # Surrogate-Control controls our Squid, Cache-Control downstream caches
2163                                         wfDebug( __METHOD__ . ": proxy caching with ESI; {$this->mLastModified} **\n", 'log' );
2164                                         # start with a shorter timeout for initial testing
2165                                         # header( 'Surrogate-Control: max-age=2678400+2678400, content="ESI/1.0"');
2166                                         $response->header( 'Surrogate-Control: max-age=' . $config->get( 'SquidMaxage' )
2167                                                 . '+' . $this->mSquidMaxage . ', content="ESI/1.0"' );
2168                                         $response->header( 'Cache-Control: s-maxage=0, must-revalidate, max-age=0' );
2169                                 } else {
2170                                         # We'll purge the proxy cache for anons explicitly, but require end user agents
2171                                         # to revalidate against the proxy on each visit.
2172                                         # IMPORTANT! The Squid needs to replace the Cache-Control header with
2173                                         # Cache-Control: s-maxage=0, must-revalidate, max-age=0
2174                                         wfDebug( __METHOD__ . ": local proxy caching; {$this->mLastModified} **\n", 'log' );
2175                                         # start with a shorter timeout for initial testing
2176                                         # header( "Cache-Control: s-maxage=2678400, must-revalidate, max-age=0" );
2177                                         $response->header( 'Cache-Control: s-maxage=' . $this->mSquidMaxage
2178                                                 . ', must-revalidate, max-age=0' );
2179                                 }
2180                         } else {
2181                                 # We do want clients to cache if they can, but they *must* check for updates
2182                                 # on revisiting the page.
2183                                 wfDebug( __METHOD__ . ": private caching; {$this->mLastModified} **\n", 'log' );
2184                                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
2185                                 $response->header( "Cache-Control: private, must-revalidate, max-age=0" );
2186                         }
2187                         if ( $this->mLastModified ) {
2188                                 $response->header( "Last-Modified: {$this->mLastModified}" );
2189                         }
2190                 } else {
2191                         wfDebug( __METHOD__ . ": no caching **\n", 'log' );
2192
2193                         # In general, the absence of a last modified header should be enough to prevent
2194                         # the client from using its cache. We send a few other things just to make sure.
2195                         $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
2196                         $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
2197                         $response->header( 'Pragma: no-cache' );
2198                 }
2199         }
2200
2201         /**
2202          * Finally, all the text has been munged and accumulated into
2203          * the object, let's actually output it:
2204          */
2205         public function output() {
2206                 if ( $this->mDoNothing ) {
2207                         return;
2208                 }
2209
2210                 $response = $this->getRequest()->response();
2211                 $config = $this->getConfig();
2212
2213                 if ( $this->mRedirect != '' ) {
2214                         # Standards require redirect URLs to be absolute
2215                         $this->mRedirect = wfExpandUrl( $this->mRedirect, PROTO_CURRENT );
2216
2217                         $redirect = $this->mRedirect;
2218                         $code = $this->mRedirectCode;
2219
2220                         if ( Hooks::run( "BeforePageRedirect", array( $this, &$redirect, &$code ) ) ) {
2221                                 if ( $code == '301' || $code == '303' ) {
2222                                         if ( !$config->get( 'DebugRedirects' ) ) {
2223                                                 $message = HttpStatus::getMessage( $code );
2224                                                 $response->header( "HTTP/1.1 $code $message" );
2225                                         }
2226                                         $this->mLastModified = wfTimestamp( TS_RFC2822 );
2227                                 }
2228                                 if ( $config->get( 'VaryOnXFP' ) ) {
2229                                         $this->addVaryHeader( 'X-Forwarded-Proto' );
2230                                 }
2231                                 $this->sendCacheControl();
2232
2233                                 $response->header( "Content-Type: text/html; charset=utf-8" );
2234                                 if ( $config->get( 'DebugRedirects' ) ) {
2235                                         $url = htmlspecialchars( $redirect );
2236                                         print "<html>\n<head>\n<title>Redirect</title>\n</head>\n<body>\n";
2237                                         print "<p>Location: <a href=\"$url\">$url</a></p>\n";
2238                                         print "</body>\n</html>\n";
2239                                 } else {
2240                                         $response->header( 'Location: ' . $redirect );
2241                                 }
2242                         }
2243
2244                         return;
2245                 } elseif ( $this->mStatusCode ) {
2246                         $message = HttpStatus::getMessage( $this->mStatusCode );
2247                         if ( $message ) {
2248                                 $response->header( 'HTTP/1.1 ' . $this->mStatusCode . ' ' . $message );
2249                         }
2250                 }
2251
2252                 # Buffer output; final headers may depend on later processing
2253                 ob_start();
2254
2255                 $response->header( 'Content-type: ' . $config->get( 'MimeType' ) . '; charset=UTF-8' );
2256                 $response->header( 'Content-language: ' . $config->get( 'LanguageCode' ) );
2257
2258                 // Avoid Internet Explorer "compatibility view" in IE 8-10, so that
2259                 // jQuery etc. can work correctly.
2260                 $response->header( 'X-UA-Compatible: IE=Edge' );
2261
2262                 // Prevent framing, if requested
2263                 $frameOptions = $this->getFrameOptions();
2264                 if ( $frameOptions ) {
2265                         $response->header( "X-Frame-Options: $frameOptions" );
2266                 }
2267
2268                 if ( $this->mArticleBodyOnly ) {
2269                         echo $this->mBodytext;
2270                 } else {
2271
2272                         $sk = $this->getSkin();
2273                         // add skin specific modules
2274                         $modules = $sk->getDefaultModules();
2275
2276                         // enforce various default modules for all skins
2277                         $coreModules = array(
2278                                 // keep this list as small as possible
2279                                 'mediawiki.page.startup',
2280                                 'mediawiki.user',
2281                         );
2282
2283                         // Support for high-density display images if enabled
2284                         if ( $config->get( 'ResponsiveImages' ) ) {
2285                                 $coreModules[] = 'mediawiki.hidpi';
2286                         }
2287
2288                         $this->addModules( $coreModules );
2289                         foreach ( $modules as $group ) {
2290                                 $this->addModules( $group );
2291                         }
2292                         MWDebug::addModules( $this );
2293
2294                         // Hook that allows last minute changes to the output page, e.g.
2295                         // adding of CSS or Javascript by extensions.
2296                         Hooks::run( 'BeforePageDisplay', array( &$this, &$sk ) );
2297
2298                         $sk->outputPage();
2299                 }
2300
2301                 // This hook allows last minute changes to final overall output by modifying output buffer
2302                 Hooks::run( 'AfterFinalPageOutput', array( $this ) );
2303
2304                 $this->sendCacheControl();
2305
2306                 ob_end_flush();
2307
2308         }
2309
2310         /**
2311          * Actually output something with print.
2312          *
2313          * @param string $ins The string to output
2314          * @deprecated since 1.22 Use echo yourself.
2315          */
2316         public function out( $ins ) {
2317                 wfDeprecated( __METHOD__, '1.22' );
2318                 print $ins;
2319         }
2320
2321         /**
2322          * Produce a "user is blocked" page.
2323          * @deprecated since 1.18
2324          */
2325         function blockedPage() {
2326                 throw new UserBlockedError( $this->getUser()->mBlock );
2327         }
2328
2329         /**
2330          * Prepare this object to display an error page; disable caching and
2331          * indexing, clear the current text and redirect, set the page's title
2332          * and optionally an custom HTML title (content of the "<title>" tag).
2333          *
2334          * @param string|Message $pageTitle Will be passed directly to setPageTitle()
2335          * @param string|Message $htmlTitle Will be passed directly to setHTMLTitle();
2336          *                   optional, if not passed the "<title>" attribute will be
2337          *                   based on $pageTitle
2338          */
2339         public function prepareErrorPage( $pageTitle, $htmlTitle = false ) {
2340                 $this->setPageTitle( $pageTitle );
2341                 if ( $htmlTitle !== false ) {
2342                         $this->setHTMLTitle( $htmlTitle );
2343                 }
2344                 $this->setRobotPolicy( 'noindex,nofollow' );
2345                 $this->setArticleRelated( false );
2346                 $this->enableClientCache( false );
2347                 $this->mRedirect = '';
2348                 $this->clearSubtitle();
2349                 $this->clearHTML();
2350         }
2351
2352         /**
2353          * Output a standard error page
2354          *
2355          * showErrorPage( 'titlemsg', 'pagetextmsg' );
2356          * showErrorPage( 'titlemsg', 'pagetextmsg', array( 'param1', 'param2' ) );
2357          * showErrorPage( 'titlemsg', $messageObject );
2358          * showErrorPage( $titleMessageObject, $messageObject );
2359          *
2360          * @param string|Message $title Message key (string) for page title, or a Message object
2361          * @param string|Message $msg Message key (string) for page text, or a Message object
2362          * @param array $params Message parameters; ignored if $msg is a Message object
2363          */
2364         public function showErrorPage( $title, $msg, $params = array() ) {
2365                 if ( !$title instanceof Message ) {
2366                         $title = $this->msg( $title );
2367                 }
2368
2369                 $this->prepareErrorPage( $title );
2370
2371                 if ( $msg instanceof Message ) {
2372                         if ( $params !== array() ) {
2373                                 trigger_error( 'Argument ignored: $params. The message parameters argument '
2374                                         . 'is discarded when the $msg argument is a Message object instead of '
2375                                         . 'a string.', E_USER_NOTICE );
2376                         }
2377                         $this->addHTML( $msg->parseAsBlock() );
2378                 } else {
2379                         $this->addWikiMsgArray( $msg, $params );
2380                 }
2381
2382                 $this->returnToMain();
2383         }
2384
2385         /**
2386          * Output a standard permission error page
2387          *
2388          * @param array $errors Error message keys
2389          * @param string $action Action that was denied or null if unknown
2390          */
2391         public function showPermissionsErrorPage( array $errors, $action = null ) {
2392                 // For some action (read, edit, create and upload), display a "login to do this action"
2393                 // error if all of the following conditions are met:
2394                 // 1. the user is not logged in
2395                 // 2. the only error is insufficient permissions (i.e. no block or something else)
2396                 // 3. the error can be avoided simply by logging in
2397                 if ( in_array( $action, array( 'read', 'edit', 'createpage', 'createtalk', 'upload' ) )
2398                         && $this->getUser()->isAnon() && count( $errors ) == 1 && isset( $errors[0][0] )
2399                         && ( $errors[0][0] == 'badaccess-groups' || $errors[0][0] == 'badaccess-group0' )
2400                         && ( User::groupHasPermission( 'user', $action )
2401                         || User::groupHasPermission( 'autoconfirmed', $action ) )
2402                 ) {
2403                         $displayReturnto = null;
2404
2405                         # Due to bug 32276, if a user does not have read permissions,
2406                         # $this->getTitle() will just give Special:Badtitle, which is
2407                         # not especially useful as a returnto parameter. Use the title
2408                         # from the request instead, if there was one.
2409                         $request = $this->getRequest();
2410                         $returnto = Title::newFromURL( $request->getVal( 'title', '' ) );
2411                         if ( $action == 'edit' ) {
2412                                 $msg = 'whitelistedittext';
2413                                 $displayReturnto = $returnto;
2414                         } elseif ( $action == 'createpage' || $action == 'createtalk' ) {
2415                                 $msg = 'nocreatetext';
2416                         } elseif ( $action == 'upload' ) {
2417                                 $msg = 'uploadnologintext';
2418                         } else { # Read
2419                                 $msg = 'loginreqpagetext';
2420                                 $displayReturnto = Title::newMainPage();
2421                         }
2422
2423                         $query = array();
2424
2425                         if ( $returnto ) {
2426                                 $query['returnto'] = $returnto->getPrefixedText();
2427
2428                                 if ( !$request->wasPosted() ) {
2429                                         $returntoquery = $request->getValues();
2430                                         unset( $returntoquery['title'] );
2431                                         unset( $returntoquery['returnto'] );
2432                                         unset( $returntoquery['returntoquery'] );
2433                                         $query['returntoquery'] = wfArrayToCgi( $returntoquery );
2434                                 }
2435                         }
2436                         $loginLink = Linker::linkKnown(
2437                                 SpecialPage::getTitleFor( 'Userlogin' ),
2438                                 $this->msg( 'loginreqlink' )->escaped(),
2439                                 array(),
2440                                 $query
2441                         );
2442
2443                         $this->prepareErrorPage( $this->msg( 'loginreqtitle' ) );
2444                         $this->addHTML( $this->msg( $msg )->rawParams( $loginLink )->parse() );
2445
2446                         # Don't return to a page the user can't read otherwise
2447                         # we'll end up in a pointless loop
2448                         if ( $displayReturnto && $displayReturnto->userCan( 'read', $this->getUser() ) ) {
2449                                 $this->returnToMain( null, $displayReturnto );
2450                         }
2451                 } else {
2452                         $this->prepareErrorPage( $this->msg( 'permissionserrors' ) );
2453                         $this->addWikiText( $this->formatPermissionsErrorMessage( $errors, $action ) );
2454                 }
2455         }
2456
2457         /**
2458          * Display an error page indicating that a given version of MediaWiki is
2459          * required to use it
2460          *
2461          * @param mixed $version The version of MediaWiki needed to use the page
2462          */
2463         public function versionRequired( $version ) {
2464                 $this->prepareErrorPage( $this->msg( 'versionrequired', $version ) );
2465
2466                 $this->addWikiMsg( 'versionrequiredtext', $version );
2467                 $this->returnToMain();
2468         }
2469
2470         /**
2471          * Display an error page noting that a given permission bit is required.
2472          * @deprecated since 1.18, just throw the exception directly
2473          * @param string $permission Key required
2474          * @throws PermissionsError
2475          */
2476         public function permissionRequired( $permission ) {
2477                 throw new PermissionsError( $permission );
2478         }
2479
2480         /**
2481          * Produce the stock "please login to use the wiki" page
2482          *
2483          * @deprecated since 1.19; throw the exception directly
2484          */
2485         public function loginToUse() {
2486                 throw new PermissionsError( 'read' );
2487         }
2488
2489         /**
2490          * Format a list of error messages
2491          *
2492          * @param array $errors Array of arrays returned by Title::getUserPermissionsErrors
2493          * @param string $action Action that was denied or null if unknown
2494          * @return string The wikitext error-messages, formatted into a list.
2495          */
2496         public function formatPermissionsErrorMessage( array $errors, $action = null ) {
2497                 if ( $action == null ) {
2498                         $text = $this->msg( 'permissionserrorstext', count( $errors ) )->plain() . "\n\n";
2499                 } else {
2500                         $action_desc = $this->msg( "action-$action" )->plain();
2501                         $text = $this->msg(
2502                                 'permissionserrorstext-withaction',
2503                                 count( $errors ),
2504                                 $action_desc
2505                         )->plain() . "\n\n";
2506                 }
2507
2508                 if ( count( $errors ) > 1 ) {
2509                         $text .= '<ul class="permissions-errors">' . "\n";
2510
2511                         foreach ( $errors as $error ) {
2512                                 $text .= '<li>';
2513                                 $text .= call_user_func_array( array( $this, 'msg' ), $error )->plain();
2514                                 $text .= "</li>\n";
2515                         }
2516                         $text .= '</ul>';
2517                 } else {
2518                         $text .= "<div class=\"permissions-errors\">\n" .
2519                                         call_user_func_array( array( $this, 'msg' ), reset( $errors ) )->plain() .
2520                                         "\n</div>";
2521                 }
2522
2523                 return $text;
2524         }
2525
2526         /**
2527          * Display a page stating that the Wiki is in read-only mode.
2528          * Should only be called after wfReadOnly() has returned true.
2529          *
2530          * Historically, this function was used to show the source of the page that the user
2531          * was trying to edit and _also_ permissions error messages. The relevant code was
2532          * moved into EditPage in 1.19 (r102024 / d83c2a431c2a) and removed here in 1.25.
2533          *
2534          * @deprecated since 1.25; throw the exception directly
2535          * @throws ReadOnlyError
2536          */
2537         public function readOnlyPage() {
2538                 if ( func_num_args() > 0 ) {
2539                         throw new MWException( __METHOD__ . ' no longer accepts arguments since 1.25.' );
2540                 }
2541
2542                 throw new ReadOnlyError;
2543         }
2544
2545         /**
2546          * Turn off regular page output and return an error response
2547          * for when rate limiting has triggered.
2548          *
2549          * @deprecated since 1.25; throw the exception directly
2550          */
2551         public function rateLimited() {
2552                 wfDeprecated( __METHOD__, '1.25' );
2553                 throw new ThrottledError;
2554         }
2555
2556         /**
2557          * Show a warning about slave lag
2558          *
2559          * If the lag is higher than $wgSlaveLagCritical seconds,
2560          * then the warning is a bit more obvious. If the lag is
2561          * lower than $wgSlaveLagWarning, then no warning is shown.
2562          *
2563          * @param int $lag Slave lag
2564          */
2565         public function showLagWarning( $lag ) {
2566                 $config = $this->getConfig();
2567                 if ( $lag >= $config->get( 'SlaveLagWarning' ) ) {
2568                         $message = $lag < $config->get( 'SlaveLagCritical' )
2569                                 ? 'lag-warn-normal'
2570                                 : 'lag-warn-high';
2571                         $wrap = Html::rawElement( 'div', array( 'class' => "mw-{$message}" ), "\n$1\n" );
2572                         $this->wrapWikiMsg( "$wrap\n", array( $message, $this->getLanguage()->formatNum( $lag ) ) );
2573                 }
2574         }
2575
2576         public function showFatalError( $message ) {
2577                 $this->prepareErrorPage( $this->msg( 'internalerror' ) );
2578
2579                 $this->addHTML( $message );
2580         }
2581
2582         public function showUnexpectedValueError( $name, $val ) {
2583                 $this->showFatalError( $this->msg( 'unexpected', $name, $val )->text() );
2584         }
2585
2586         public function showFileCopyError( $old, $new ) {
2587                 $this->showFatalError( $this->msg( 'filecopyerror', $old, $new )->text() );
2588         }
2589
2590         public function showFileRenameError( $old, $new ) {
2591                 $this->showFatalError( $this->msg( 'filerenameerror', $old, $new )->text() );
2592         }
2593
2594         public function showFileDeleteError( $name ) {
2595                 $this->showFatalError( $this->msg( 'filedeleteerror', $name )->text() );
2596         }
2597
2598         public function showFileNotFoundError( $name ) {
2599                 $this->showFatalError( $this->msg( 'filenotfound', $name )->text() );
2600         }
2601
2602         /**
2603          * Add a "return to" link pointing to a specified title
2604          *
2605          * @param Title $title Title to link
2606          * @param array $query Query string parameters
2607          * @param string $text Text of the link (input is not escaped)
2608          * @param array $options Options array to pass to Linker
2609          */
2610         public function addReturnTo( $title, array $query = array(), $text = null, $options = array() ) {
2611                 $link = $this->msg( 'returnto' )->rawParams(
2612                         Linker::link( $title, $text, array(), $query, $options ) )->escaped();
2613                 $this->addHTML( "<p id=\"mw-returnto\">{$link}</p>\n" );
2614         }
2615
2616         /**
2617          * Add a "return to" link pointing to a specified title,
2618          * or the title indicated in the request, or else the main page
2619          *
2620          * @param mixed $unused
2621          * @param Title|string $returnto Title or String to return to
2622          * @param string $returntoquery Query string for the return to link
2623          */
2624         public function returnToMain( $unused = null, $returnto = null, $returntoquery = null ) {
2625                 if ( $returnto == null ) {
2626                         $returnto = $this->getRequest()->getText( 'returnto' );
2627                 }
2628
2629                 if ( $returntoquery == null ) {
2630                         $returntoquery = $this->getRequest()->getText( 'returntoquery' );
2631                 }
2632
2633                 if ( $returnto === '' ) {
2634                         $returnto = Title::newMainPage();
2635                 }
2636
2637                 if ( is_object( $returnto ) ) {
2638                         $titleObj = $returnto;
2639                 } else {
2640                         $titleObj = Title::newFromText( $returnto );
2641                 }
2642                 if ( !is_object( $titleObj ) ) {
2643                         $titleObj = Title::newMainPage();
2644                 }
2645
2646                 $this->addReturnTo( $titleObj, wfCgiToArray( $returntoquery ) );
2647         }
2648
2649         /**
2650          * @param Skin $sk The given Skin
2651          * @param bool $includeStyle Unused
2652          * @return string The doctype, opening "<html>", and head element.
2653          */
2654         public function headElement( Skin $sk, $includeStyle = true ) {
2655                 global $wgContLang;
2656
2657                 $userdir = $this->getLanguage()->getDir();
2658                 $sitedir = $wgContLang->getDir();
2659
2660                 $ret = Html::htmlHeader( $sk->getHtmlElementAttributes() );
2661
2662                 if ( $this->getHTMLTitle() == '' ) {
2663                         $this->setHTMLTitle( $this->msg( 'pagetitle', $this->getPageTitle() )->inContentLanguage() );
2664                 }
2665
2666                 $openHead = Html::openElement( 'head' );
2667                 if ( $openHead ) {
2668                         # Don't bother with the newline if $head == ''
2669                         $ret .= "$openHead\n";
2670                 }
2671
2672                 if ( !Html::isXmlMimeType( $this->getConfig()->get( 'MimeType' ) ) ) {
2673                         // Add <meta charset="UTF-8">
2674                         // This should be before <title> since it defines the charset used by
2675                         // text including the text inside <title>.
2676                         // The spec recommends defining XHTML5's charset using the XML declaration
2677                         // instead of meta.
2678                         // Our XML declaration is output by Html::htmlHeader.
2679                         // http://www.whatwg.org/html/semantics.html#attr-meta-http-equiv-content-type
2680                         // http://www.whatwg.org/html/semantics.html#charset
2681                         $ret .= Html::element( 'meta', array( 'charset' => 'UTF-8' ) ) . "\n";
2682                 }
2683
2684                 $ret .= Html::element( 'title', null, $this->getHTMLTitle() ) . "\n";
2685
2686                 foreach ( $this->getHeadLinksArray() as $item ) {
2687                         $ret .= $item . "\n";
2688                 }
2689
2690                 // No newline after buildCssLinks since makeResourceLoaderLink did that already
2691                 $ret .= $this->buildCssLinks();
2692
2693                 $ret .= $this->getHeadScripts() . "\n";
2694
2695                 foreach ( $this->mHeadItems as $item ) {
2696                         $ret .= $item . "\n";
2697                 }
2698
2699                 $closeHead = Html::closeElement( 'head' );
2700                 if ( $closeHead ) {
2701                         $ret .= "$closeHead\n";
2702                 }
2703
2704                 $bodyClasses = array();
2705                 $bodyClasses[] = 'mediawiki';
2706
2707                 # Classes for LTR/RTL directionality support
2708                 $bodyClasses[] = $userdir;
2709                 $bodyClasses[] = "sitedir-$sitedir";
2710
2711                 if ( $this->getLanguage()->capitalizeAllNouns() ) {
2712                         # A <body> class is probably not the best way to do this . . .
2713                         $bodyClasses[] = 'capitalize-all-nouns';
2714                 }
2715
2716                 $bodyClasses[] = $sk->getPageClasses( $this->getTitle() );
2717                 $bodyClasses[] = 'skin-' . Sanitizer::escapeClass( $sk->getSkinName() );
2718                 $bodyClasses[] =
2719                         'action-' . Sanitizer::escapeClass( Action::getActionName( $this->getContext() ) );
2720
2721                 $bodyAttrs = array();
2722                 // While the implode() is not strictly needed, it's used for backwards compatibility
2723                 // (this used to be built as a string and hooks likely still expect that).
2724                 $bodyAttrs['class'] = implode( ' ', $bodyClasses );
2725
2726                 // Allow skins and extensions to add body attributes they need
2727                 $sk->addToBodyAttributes( $this, $bodyAttrs );
2728                 Hooks::run( 'OutputPageBodyAttributes', array( $this, $sk, &$bodyAttrs ) );
2729
2730                 $ret .= Html::openElement( 'body', $bodyAttrs ) . "\n";
2731
2732                 return $ret;
2733         }
2734
2735         /**
2736          * Get a ResourceLoader object associated with this OutputPage
2737          *
2738          * @return ResourceLoader
2739          */
2740         public function getResourceLoader() {
2741                 if ( is_null( $this->mResourceLoader ) ) {
2742                         $this->mResourceLoader = new ResourceLoader(
2743                                 $this->getConfig(),
2744                                 LoggerFactory::getInstance( 'resourceloader' )
2745                         );
2746                 }
2747                 return $this->mResourceLoader;
2748         }
2749
2750         /**
2751          * @todo Document
2752          * @param array|string $modules One or more module names
2753          * @param string $only ResourceLoaderModule TYPE_ class constant
2754          * @param bool $useESI
2755          * @param array $extraQuery Array with extra query parameters to add to each
2756          *   request. array( param => value ).
2757          * @param bool $loadCall If true, output an (asynchronous) mw.loader.load()
2758          *   call rather than a "<script src='...'>" tag.
2759          * @return string The html "<script>", "<link>" and "<style>" tags
2760          */
2761         public function makeResourceLoaderLink( $modules, $only, $useESI = false,
2762                 array $extraQuery = array(), $loadCall = false
2763         ) {
2764                 $modules = (array)$modules;
2765
2766                 $links = array(
2767                         'html' => '',
2768                         'states' => array(),
2769                 );
2770
2771                 if ( !count( $modules ) ) {
2772                         return $links;
2773                 }
2774
2775                 if ( count( $modules ) > 1 ) {
2776                         // Remove duplicate module requests
2777                         $modules = array_unique( $modules );
2778                         // Sort module names so requests are more uniform
2779                         sort( $modules );
2780
2781                         if ( ResourceLoader::inDebugMode() ) {
2782                                 // Recursively call us for every item
2783                                 foreach ( $modules as $name ) {
2784                                         $link = $this->makeResourceLoaderLink( $name, $only, $useESI );
2785                                         $links['html'] .= $link['html'];
2786                                         $links['states'] += $link['states'];
2787                                 }
2788                                 return $links;
2789                         }
2790                 }
2791
2792                 if ( !is_null( $this->mTarget ) ) {
2793                         $extraQuery['target'] = $this->mTarget;
2794                 }
2795
2796                 // Create keyed-by-source and then keyed-by-group list of module objects from modules list
2797                 $sortedModules = array();
2798                 $resourceLoader = $this->getResourceLoader();
2799                 $resourceLoaderUseESI = $this->getConfig()->get( 'ResourceLoaderUseESI' );
2800                 foreach ( $modules as $name ) {
2801                         $module = $resourceLoader->getModule( $name );
2802                         # Check that we're allowed to include this module on this page
2803                         if ( !$module
2804                                 || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_SCRIPTS )
2805                                         && $only == ResourceLoaderModule::TYPE_SCRIPTS )
2806                                 || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_STYLES )
2807                                         && $only == ResourceLoaderModule::TYPE_STYLES )
2808                                 || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_COMBINED )
2809                                         && $only == ResourceLoaderModule::TYPE_COMBINED )
2810                                 || ( $this->mTarget && !in_array( $this->mTarget, $module->getTargets() ) )
2811                         ) {
2812                                 continue;
2813                         }
2814
2815                         $sortedModules[$module->getSource()][$module->getGroup()][$name] = $module;
2816                 }
2817
2818                 foreach ( $sortedModules as $source => $groups ) {
2819                         foreach ( $groups as $group => $grpModules ) {
2820                                 // Special handling for user-specific groups
2821                                 $user = null;
2822                                 if ( ( $group === 'user' || $group === 'private' ) && $this->getUser()->isLoggedIn() ) {
2823                                         $user = $this->getUser()->getName();
2824                                 }
2825
2826                                 // Create a fake request based on the one we are about to make so modules return
2827                                 // correct timestamp and emptiness data
2828                                 $query = ResourceLoader::makeLoaderQuery(
2829                                         array(), // modules; not determined yet
2830                                         $this->getLanguage()->getCode(),
2831                                         $this->getSkin()->getSkinName(),
2832                                         $user,
2833                                         null, // version; not determined yet
2834                                         ResourceLoader::inDebugMode(),
2835                                         $only === ResourceLoaderModule::TYPE_COMBINED ? null : $only,
2836                                         $this->isPrintable(),
2837                                         $this->getRequest()->getBool( 'handheld' ),
2838                                         $extraQuery
2839                                 );
2840                                 $context = new ResourceLoaderContext( $resourceLoader, new FauxRequest( $query ) );
2841
2842                                 // Extract modules that know they're empty and see if we have one or more
2843                                 // raw modules
2844                                 $isRaw = false;
2845                                 foreach ( $grpModules as $key => $module ) {
2846                                         // Inline empty modules: since they're empty, just mark them as 'ready' (bug 46857)
2847                                         // If we're only getting the styles, we don't need to do anything for empty modules.
2848                                         if ( $module->isKnownEmpty( $context ) ) {
2849                                                 unset( $grpModules[$key] );
2850                                                 if ( $only !== ResourceLoaderModule::TYPE_STYLES ) {
2851                                                         $links['states'][$key] = 'ready';
2852                                                 }
2853                                         }
2854
2855                                         $isRaw |= $module->isRaw();
2856                                 }
2857
2858                                 // If there are no non-empty modules, skip this group
2859                                 if ( count( $grpModules ) === 0 ) {
2860                                         continue;
2861                                 }
2862
2863                                 // Inline private modules. These can't be loaded through load.php for security
2864                                 // reasons, see bug 34907. Note that these modules should be loaded from
2865                                 // getHeadScripts() before the first loader call. Otherwise other modules can't
2866                                 // properly use them as dependencies (bug 30914)
2867                                 if ( $group === 'private' ) {
2868                                         if ( $only == ResourceLoaderModule::TYPE_STYLES ) {
2869                                                 $links['html'] .= Html::inlineStyle(
2870                                                         $resourceLoader->makeModuleResponse( $context, $grpModules )
2871                                                 );
2872                                         } else {
2873                                                 $links['html'] .= ResourceLoader::makeInlineScript(
2874                                                         $resourceLoader->makeModuleResponse( $context, $grpModules )
2875                                                 );
2876                                         }
2877                                         $links['html'] .= "\n";
2878                                         continue;
2879                                 }
2880
2881                                 // Special handling for the user group; because users might change their stuff
2882                                 // on-wiki like user pages, or user preferences; we need to find the highest
2883                                 // timestamp of these user-changeable modules so we can ensure cache misses on change
2884                                 // This should NOT be done for the site group (bug 27564) because anons get that too
2885                                 // and we shouldn't be putting timestamps in Squid-cached HTML
2886                                 $version = null;
2887                                 if ( $group === 'user' ) {
2888                                         $query['version'] = $resourceLoader->getCombinedVersion( $context, array_keys( $grpModules ) );
2889                                 }
2890
2891                                 $query['modules'] = ResourceLoader::makePackedModulesString( array_keys( $grpModules ) );
2892                                 $moduleContext = new ResourceLoaderContext( $resourceLoader, new FauxRequest( $query ) );
2893                                 $url = $resourceLoader->createLoaderURL( $source, $moduleContext, $extraQuery );
2894
2895                                 if ( $useESI && $resourceLoaderUseESI ) {
2896                                         $esi = Xml::element( 'esi:include', array( 'src' => $url ) );
2897                                         if ( $only == ResourceLoaderModule::TYPE_STYLES ) {
2898                                                 $link = Html::inlineStyle( $esi );
2899                                         } else {
2900                                                 $link = Html::inlineScript( $esi );
2901                                         }
2902                                 } else {
2903                                         // Automatically select style/script elements
2904                                         if ( $only === ResourceLoaderModule::TYPE_STYLES ) {
2905                                                 $link = Html::linkedStyle( $url );
2906                                         } elseif ( $loadCall ) {
2907                                                 $link = ResourceLoader::makeInlineScript(
2908                                                         Xml::encodeJsCall( 'mw.loader.load', array( $url, 'text/javascript', true ) )
2909                                                 );
2910                                         } else {
2911                                                 $link = Html::linkedScript( $url );
2912                                                 if ( !$context->getRaw() && !$isRaw ) {
2913                                                         // Wrap only=script / only=combined requests in a conditional as
2914                                                         // browsers not supported by the startup module would unconditionally
2915                                                         // execute this module. Otherwise users will get "ReferenceError: mw is
2916                                                         // undefined" or "jQuery is undefined" from e.g. a "site" module.
2917                                                         $link = ResourceLoader::makeInlineScript(
2918                                                                 Xml::encodeJsCall( 'document.write', array( $link ) )
2919                                                         );
2920                                                 }
2921
2922                                                 // For modules requested directly in the html via <link> or <script>,
2923                                                 // tell mw.loader they are being loading to prevent duplicate requests.
2924                                                 foreach ( $grpModules as $key => $module ) {
2925                                                         // Don't output state=loading for the startup module..
2926                                                         if ( $key !== 'startup' ) {
2927                                                                 $links['states'][$key] = 'loading';
2928                                                         }
2929                                                 }
2930                                         }
2931                                 }
2932
2933                                 if ( $group == 'noscript' ) {
2934                                         $links['html'] .= Html::rawElement( 'noscript', array(), $link ) . "\n";
2935                                 } else {
2936                                         $links['html'] .= $link . "\n";
2937                                 }
2938                         }
2939                 }
2940
2941                 return $links;
2942         }
2943
2944         /**
2945          * Build html output from an array of links from makeResourceLoaderLink.
2946          * @param array $links
2947          * @return string HTML
2948          */
2949         protected static function getHtmlFromLoaderLinks( array $links ) {
2950                 $html = '';
2951                 $states = array();
2952                 foreach ( $links as $link ) {
2953                         if ( !is_array( $link ) ) {
2954                                 $html .= $link;
2955                         } else {
2956                                 $html .= $link['html'];
2957                                 $states += $link['states'];
2958                         }
2959                 }
2960
2961                 if ( count( $states ) ) {
2962                         $html = ResourceLoader::makeInlineScript(
2963                                 ResourceLoader::makeLoaderStateScript( $states )
2964                         ) . "\n" . $html;
2965                 }
2966
2967                 return $html;
2968         }
2969
2970         /**
2971          * JS stuff to put in the "<head>". This is the startup module, config
2972          * vars and modules marked with position 'top'
2973          *
2974          * @return string HTML fragment
2975          */
2976         function getHeadScripts() {
2977                 // Startup - this will immediately load jquery and mediawiki modules
2978                 $links = array();
2979                 $links[] = $this->makeResourceLoaderLink( 'startup', ResourceLoaderModule::TYPE_SCRIPTS, true );
2980
2981                 // Load config before anything else
2982                 $links[] = ResourceLoader::makeInlineScript(
2983                         ResourceLoader::makeConfigSetScript( $this->getJSVars() )
2984                 );
2985
2986                 // Load embeddable private modules before any loader links
2987                 // This needs to be TYPE_COMBINED so these modules are properly wrapped
2988                 // in mw.loader.implement() calls and deferred until mw.user is available
2989                 $embedScripts = array( 'user.options' );
2990                 $links[] = $this->makeResourceLoaderLink( $embedScripts, ResourceLoaderModule::TYPE_COMBINED );
2991                 // Separate user.tokens as otherwise caching will be allowed (T84960)
2992                 $links[] = $this->makeResourceLoaderLink( 'user.tokens', ResourceLoaderModule::TYPE_COMBINED );
2993
2994                 // Scripts and messages "only" requests marked for top inclusion
2995                 $links[] = $this->makeResourceLoaderLink(
2996                         $this->getModuleScripts( true, 'top' ),
2997                         ResourceLoaderModule::TYPE_SCRIPTS
2998                 );
2999
3000                 // Modules requests - let the client calculate dependencies and batch requests as it likes
3001                 // Only load modules that have marked themselves for loading at the top
3002                 $modules = $this->getModules( true, 'top' );
3003                 if ( $modules ) {
3004                         $links[] = ResourceLoader::makeInlineScript(
3005                                 Xml::encodeJsCall( 'mw.loader.load', array( $modules ) )
3006                         );
3007                 }
3008
3009                 if ( $this->getConfig()->get( 'ResourceLoaderExperimentalAsyncLoading' ) ) {
3010                         $links[] = $this->getScriptsForBottomQueue( true );
3011                 }
3012
3013                 return self::getHtmlFromLoaderLinks( $links );
3014         }
3015
3016         /**
3017          * JS stuff to put at the 'bottom', which can either be the bottom of the
3018          * "<body>" or the bottom of the "<head>" depending on
3019          * $wgResourceLoaderExperimentalAsyncLoading: modules marked with position
3020          * 'bottom', legacy scripts ($this->mScripts), user preferences, site JS
3021          * and user JS.
3022          *
3023          * @param bool $inHead If true, this HTML goes into the "<head>",
3024          *   if false it goes into the "<body>".
3025          * @return string
3026          */
3027         function getScriptsForBottomQueue( $inHead ) {
3028                 // Scripts "only" requests marked for bottom inclusion
3029                 // If we're in the <head>, use load() calls rather than <script src="..."> tags
3030                 $links = array();
3031
3032                 $links[] = $this->makeResourceLoaderLink( $this->getModuleScripts( true, 'bottom' ),
3033                         ResourceLoaderModule::TYPE_SCRIPTS, /* $useESI = */ false, /* $extraQuery = */ array(),
3034                         /* $loadCall = */ $inHead
3035                 );
3036
3037                 $links[] = $this->makeResourceLoaderLink( $this->getModuleStyles( true, 'bottom' ),
3038                         ResourceLoaderModule::TYPE_STYLES, /* $useESI = */ false, /* $extraQuery = */ array(),
3039                         /* $loadCall = */ $inHead
3040                 );
3041
3042                 // Modules requests - let the client calculate dependencies and batch requests as it likes
3043                 // Only load modules that have marked themselves for loading at the bottom
3044                 $modules = $this->getModules( true, 'bottom' );
3045                 if ( $modules ) {
3046                         $links[] = ResourceLoader::makeInlineScript(
3047                                 Xml::encodeJsCall( 'mw.loader.load', array( $modules, null, true ) )
3048                         );
3049                 }
3050
3051                 // Legacy Scripts
3052                 $links[] = "\n" . $this->mScripts;
3053
3054                 // Add site JS if enabled
3055                 $links[] = $this->makeResourceLoaderLink( 'site', ResourceLoaderModule::TYPE_SCRIPTS,
3056                         /* $useESI = */ false, /* $extraQuery = */ array(), /* $loadCall = */ $inHead
3057                 );
3058
3059                 // Add user JS if enabled
3060                 if ( $this->getConfig()->get( 'AllowUserJs' )
3061                         && $this->getUser()->isLoggedIn()
3062                         && $this->getTitle()
3063                         && $this->getTitle()->isJsSubpage()
3064                         && $this->userCanPreview()
3065                 ) {
3066                         # XXX: additional security check/prompt?
3067                         // We're on a preview of a JS subpage
3068                         // Exclude this page from the user module in case it's in there (bug 26283)
3069                         $links[] = $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_SCRIPTS, false,
3070                                 array( 'excludepage' => $this->getTitle()->getPrefixedDBkey() ), $inHead
3071                         );
3072                         // Load the previewed JS
3073                         $links[] = Html::inlineScript( "\n"
3074                                         . $this->getRequest()->getText( 'wpTextbox1' ) . "\n" ) . "\n";
3075
3076                         // FIXME: If the user is previewing, say, ./vector.js, his ./common.js will be loaded
3077                         // asynchronously and may arrive *after* the inline script here. So the previewed code
3078                         // may execute before ./common.js runs. Normally, ./common.js runs before ./vector.js...
3079                 } else {
3080                         // Include the user module normally, i.e., raw to avoid it being wrapped in a closure.
3081                         $links[] = $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_SCRIPTS,
3082                                 /* $useESI = */ false, /* $extraQuery = */ array(), /* $loadCall = */ $inHead
3083                         );
3084                 }
3085
3086                 // Group JS is only enabled if site JS is enabled.
3087                 $links[] = $this->makeResourceLoaderLink( 'user.groups', ResourceLoaderModule::TYPE_COMBINED,
3088                         /* $useESI = */ false, /* $extraQuery = */ array(), /* $loadCall = */ $inHead
3089                 );
3090
3091                 return self::getHtmlFromLoaderLinks( $links );
3092         }
3093
3094         /**
3095          * JS stuff to put at the bottom of the "<body>"
3096          * @return string
3097          */
3098         function getBottomScripts() {
3099                 // In case the skin wants to add bottom CSS
3100                 $this->getSkin()->setupSkinUserCss( $this );
3101
3102                 // Optimise jQuery ready event cross-browser.
3103                 // This also enforces $.isReady to be true at </body> which fixes the
3104                 // mw.loader bug in Firefox with using document.write between </body>
3105                 // and the DOMContentReady event (bug 47457).
3106                 $html = Html::inlineScript( 'if(window.jQuery)jQuery.ready();' );
3107
3108                 if ( !$this->getConfig()->get( 'ResourceLoaderExperimentalAsyncLoading' ) ) {
3109                         $html .= $this->getScriptsForBottomQueue( false );
3110                 }
3111
3112                 return $html;
3113         }
3114
3115         /**
3116          * Get the javascript config vars to include on this page
3117          *
3118          * @return array Array of javascript config vars
3119          * @since 1.23
3120          */
3121         public function getJsConfigVars() {
3122                 return $this->mJsConfigVars;
3123         }
3124
3125         /**
3126          * Add one or more variables to be set in mw.config in JavaScript
3127          *
3128          * @param string|array $keys Key or array of key/value pairs
3129          * @param mixed $value [optional] Value of the configuration variable
3130          */
3131         public function addJsConfigVars( $keys, $value = null ) {
3132                 if ( is_array( $keys ) ) {
3133                         foreach ( $keys as $key => $value ) {
3134                                 $this->mJsConfigVars[$key] = $value;
3135                         }
3136                         return;
3137                 }
3138
3139                 $this->mJsConfigVars[$keys] = $value;
3140         }
3141
3142         /**
3143          * Get an array containing the variables to be set in mw.config in JavaScript.
3144          *
3145          * Do not add things here which can be evaluated in ResourceLoaderStartUpModule
3146          * - in other words, page-independent/site-wide variables (without state).
3147          * You will only be adding bloat to the html page and causing page caches to
3148          * have to be purged on configuration changes.
3149          * @return array
3150          */
3151         public function getJSVars() {
3152                 global $wgContLang;
3153
3154                 $curRevisionId = 0;
3155                 $articleId = 0;
3156                 $canonicalSpecialPageName = false; # bug 21115
3157
3158                 $title = $this->getTitle();
3159                 $ns = $title->getNamespace();
3160                 $canonicalNamespace = MWNamespace::exists( $ns )
3161                         ? MWNamespace::getCanonicalName( $ns )
3162                         : $title->getNsText();
3163
3164                 $sk = $this->getSkin();
3165                 // Get the relevant title so that AJAX features can use the correct page name
3166                 // when making API requests from certain special pages (bug 34972).
3167                 $relevantTitle = $sk->getRelevantTitle();
3168                 $relevantUser = $sk->getRelevantUser();
3169
3170                 if ( $ns == NS_SPECIAL ) {
3171                         list( $canonicalSpecialPageName, /*...*/ ) =
3172                                 SpecialPageFactory::resolveAlias( $title->getDBkey() );
3173                 } elseif ( $this->canUseWikiPage() ) {
3174                         $wikiPage = $this->getWikiPage();
3175                         $curRevisionId = $wikiPage->getLatest();
3176                         $articleId = $wikiPage->getId();
3177                 }
3178
3179                 $lang = $title->getPageLanguage();
3180
3181                 // Pre-process information
3182                 $separatorTransTable = $lang->separatorTransformTable();
3183                 $separatorTransTable = $separatorTransTable ? $separatorTransTable : array();
3184                 $compactSeparatorTransTable = array(
3185                         implode( "\t", array_keys( $separatorTransTable ) ),
3186                         implode( "\t", $separatorTransTable ),
3187                 );
3188                 $digitTransTable = $lang->digitTransformTable();
3189                 $digitTransTable = $digitTransTable ? $digitTransTable : array();
3190                 $compactDigitTransTable = array(
3191                         implode( "\t", array_keys( $digitTransTable ) ),
3192                         implode( "\t", $digitTransTable ),
3193                 );
3194
3195                 $user = $this->getUser();
3196
3197                 $vars = array(
3198                         'wgCanonicalNamespace' => $canonicalNamespace,
3199                         'wgCanonicalSpecialPageName' => $canonicalSpecialPageName,
3200                         'wgNamespaceNumber' => $title->getNamespace(),
3201                         'wgPageName' => $title->getPrefixedDBkey(),
3202                         'wgTitle' => $title->getText(),
3203                         'wgCurRevisionId' => $curRevisionId,
3204                         'wgRevisionId' => (int)$this->getRevisionId(),
3205                         'wgArticleId' => $articleId,
3206                         'wgIsArticle' => $this->isArticle(),
3207                         'wgIsRedirect' => $title->isRedirect(),
3208                         'wgAction' => Action::getActionName( $this->getContext() ),
3209                         'wgUserName' => $user->isAnon() ? null : $user->getName(),
3210                         'wgUserGroups' => $user->getEffectiveGroups(),
3211                         'wgCategories' => $this->getCategories(),
3212                         'wgBreakFrames' => $this->getFrameOptions() == 'DENY',
3213                         'wgPageContentLanguage' => $lang->getCode(),
3214                         'wgPageContentModel' => $title->getContentModel(),
3215                         'wgSeparatorTransformTable' => $compactSeparatorTransTable,
3216                         'wgDigitTransformTable' => $compactDigitTransTable,
3217                         'wgDefaultDateFormat' => $lang->getDefaultDateFormat(),
3218                         'wgMonthNames' => $lang->getMonthNamesArray(),
3219                         'wgMonthNamesShort' => $lang->getMonthAbbreviationsArray(),
3220                         'wgRelevantPageName' => $relevantTitle->getPrefixedDBkey(),
3221                         'wgRelevantArticleId' => $relevantTitle->getArticleId(),
3222                 );
3223
3224                 if ( $user->isLoggedIn() ) {
3225                         $vars['wgUserId'] = $user->getId();
3226                         $vars['wgUserEditCount'] = $user->getEditCount();
3227                         $userReg = wfTimestampOrNull( TS_UNIX, $user->getRegistration() );
3228                         $vars['wgUserRegistration'] = $userReg !== null ? ( $userReg * 1000 ) : null;
3229                         // Get the revision ID of the oldest new message on the user's talk
3230                         // page. This can be used for constructing new message alerts on
3231                         // the client side.
3232                         $vars['wgUserNewMsgRevisionId'] = $user->getNewMessageRevisionId();
3233                 }
3234
3235                 if ( $wgContLang->hasVariants() ) {
3236                         $vars['wgUserVariant'] = $wgContLang->getPreferredVariant();
3237                 }
3238                 // Same test as SkinTemplate
3239                 $vars['wgIsProbablyEditable'] = $title->quickUserCan( 'edit', $user )
3240                         && ( $title->exists() || $title->quickUserCan( 'create', $user ) );
3241
3242                 foreach ( $title->getRestrictionTypes() as $type ) {
3243                         $vars['wgRestriction' . ucfirst( $type )] = $title->getRestrictions( $type );
3244                 }
3245
3246                 if ( $title->isMainPage() ) {
3247                         $vars['wgIsMainPage'] = true;
3248                 }
3249
3250                 if ( $this->mRedirectedFrom ) {
3251                         $vars['wgRedirectedFrom'] = $this->mRedirectedFrom->getPrefixedDBkey();
3252                 }
3253
3254                 if ( $relevantUser ) {
3255                         $vars['wgRelevantUserName'] = $relevantUser->getName();
3256                 }
3257
3258                 // Allow extensions to add their custom variables to the mw.config map.
3259                 // Use the 'ResourceLoaderGetConfigVars' hook if the variable is not
3260                 // page-dependant but site-wide (without state).
3261                 // Alternatively, you may want to use OutputPage->addJsConfigVars() instead.
3262                 Hooks::run( 'MakeGlobalVariablesScript', array( &$vars, $this ) );
3263
3264                 // Merge in variables from addJsConfigVars last
3265                 return array_merge( $vars, $this->getJsConfigVars() );
3266         }
3267
3268         /**
3269          * To make it harder for someone to slip a user a fake
3270          * user-JavaScript or user-CSS preview, a random token
3271          * is associated with the login session. If it's not
3272          * passed back with the preview request, we won't render
3273          * the code.
3274          *
3275          * @return bool
3276          */
3277         public function userCanPreview() {
3278                 if ( $this->getRequest()->getVal( 'action' ) != 'submit'
3279                         || !$this->getRequest()->wasPosted()
3280                         || !$this->getUser()->matchEditToken(
3281                                 $this->getRequest()->getVal( 'wpEditToken' ) )
3282                 ) {
3283                         return false;
3284                 }
3285                 if ( !$this->getTitle()->isJsSubpage() && !$this->getTitle()->isCssSubpage() ) {
3286                         return false;
3287                 }
3288                 if ( !$this->getTitle()->isSubpageOf( $this->getUser()->getUserPage() ) ) {
3289                         // Don't execute another user's CSS or JS on preview (T85855)
3290                         return false;
3291                 }
3292
3293                 return !count( $this->getTitle()->getUserPermissionsErrors( 'edit', $this->getUser() ) );
3294         }
3295
3296         /**
3297          * @return array Array in format "link name or number => 'link html'".
3298          */
3299         public function getHeadLinksArray() {
3300                 global $wgVersion;
3301
3302                 $tags = array();
3303                 $config = $this->getConfig();
3304
3305                 $canonicalUrl = $this->mCanonicalUrl;
3306
3307                 $tags['meta-generator'] = Html::element( 'meta', array(
3308                         'name' => 'generator',
3309                         'content' => "MediaWiki $wgVersion",
3310                 ) );
3311
3312                 if ( $config->get( 'ReferrerPolicy' ) !== false ) {
3313                         $tags['meta-referrer'] = Html::element( 'meta', array(
3314                                 'name' => 'referrer',
3315                                 'content' => $config->get( 'ReferrerPolicy' )
3316                         ) );
3317                 }
3318
3319                 $p = "{$this->mIndexPolicy},{$this->mFollowPolicy}";
3320                 if ( $p !== 'index,follow' ) {
3321                         // http://www.robotstxt.org/wc/meta-user.html
3322                         // Only show if it's different from the default robots policy
3323                         $tags['meta-robots'] = Html::element( 'meta', array(
3324                                 'name' => 'robots',
3325                                 'content' => $p,
3326                         ) );
3327                 }
3328
3329                 foreach ( $this->mMetatags as $tag ) {
3330                         if ( 0 == strcasecmp( 'http:', substr( $tag[0], 0, 5 ) ) ) {
3331                                 $a = 'http-equiv';
3332                                 $tag[0] = substr( $tag[0], 5 );
3333                         } else {
3334                                 $a = 'name';
3335                         }
3336                         $tagName = "meta-{$tag[0]}";
3337                         if ( isset( $tags[$tagName] ) ) {
3338                                 $tagName .= $tag[1];
3339                         }
3340                         $tags[$tagName] = Html::element( 'meta',
3341                                 array(
3342                                         $a => $tag[0],
3343                                         'content' => $tag[1]
3344                                 )
3345                         );
3346                 }
3347
3348                 foreach ( $this->mLinktags as $tag ) {
3349                         $tags[] = Html::element( 'link', $tag );
3350                 }
3351
3352                 # Universal edit button
3353                 if ( $config->get( 'UniversalEditButton' ) && $this->isArticleRelated() ) {
3354                         $user = $this->getUser();
3355                         if ( $this->getTitle()->quickUserCan( 'edit', $user )
3356                                 && ( $this->getTitle()->exists() || $this->getTitle()->quickUserCan( 'create', $user ) ) ) {
3357                                 // Original UniversalEditButton
3358                                 $msg = $this->msg( 'edit' )->text();
3359                                 $tags['universal-edit-button'] = Html::element( 'link', array(
3360                                         'rel' => 'alternate',
3361                                         'type' => 'application/x-wiki',
3362                                         'title' => $msg,
3363                                         'href' => $this->getTitle()->getEditURL(),
3364                                 ) );
3365                                 // Alternate edit link
3366                                 $tags['alternative-edit'] = Html::element( 'link', array(
3367                                         'rel' => 'edit',
3368                                         'title' => $msg,
3369                                         'href' => $this->getTitle()->getEditURL(),
3370                                 ) );
3371                         }
3372                 }
3373
3374                 # Generally the order of the favicon and apple-touch-icon links
3375                 # should not matter, but Konqueror (3.5.9 at least) incorrectly
3376                 # uses whichever one appears later in the HTML source. Make sure
3377                 # apple-touch-icon is specified first to avoid this.
3378                 if ( $config->get( 'AppleTouchIcon' ) !== false ) {
3379                         $tags['apple-touch-icon'] = Html::element( 'link', array(
3380                                 'rel' => 'apple-touch-icon',
3381                                 'href' => $config->get( 'AppleTouchIcon' )
3382                         ) );
3383                 }
3384
3385                 if ( $config->get( 'Favicon' ) !== false ) {
3386                         $tags['favicon'] = Html::element( 'link', array(
3387                                 'rel' => 'shortcut icon',
3388                                 'href' => $config->get( 'Favicon' )
3389                         ) );
3390                 }
3391
3392                 # OpenSearch description link
3393                 $tags['opensearch'] = Html::element( 'link', array(
3394                         'rel' => 'search',
3395                         'type' => 'application/opensearchdescription+xml',
3396                         'href' => wfScript( 'opensearch_desc' ),
3397                         'title' => $this->msg( 'opensearch-desc' )->inContentLanguage()->text(),
3398                 ) );
3399
3400                 if ( $config->get( 'EnableAPI' ) ) {
3401                         # Real Simple Discovery link, provides auto-discovery information
3402                         # for the MediaWiki API (and potentially additional custom API
3403                         # support such as WordPress or Twitter-compatible APIs for a
3404                         # blogging extension, etc)
3405                         $tags['rsd'] = Html::element( 'link', array(
3406                                 'rel' => 'EditURI',
3407                                 'type' => 'application/rsd+xml',
3408                                 // Output a protocol-relative URL here if $wgServer is protocol-relative
3409                                 // Whether RSD accepts relative or protocol-relative URLs is completely undocumented, though
3410                                 'href' => wfExpandUrl( wfAppendQuery(
3411                                         wfScript( 'api' ),
3412                                         array( 'action' => 'rsd' ) ),
3413                                         PROTO_RELATIVE
3414                                 ),
3415                         ) );
3416                 }
3417
3418                 # Language variants
3419                 if ( !$config->get( 'DisableLangConversion' ) ) {
3420                         $lang = $this->getTitle()->getPageLanguage();
3421                         if ( $lang->hasVariants() ) {
3422                                 $variants = $lang->getVariants();
3423                                 foreach ( $variants as $_v ) {
3424                                         $tags["variant-$_v"] = Html::element( 'link', array(
3425                                                 'rel' => 'alternate',
3426                                                 'hreflang' => wfBCP47( $_v ),
3427                                                 'href' => $this->getTitle()->getLocalURL( array( 'variant' => $_v ) ) )
3428                                         );
3429                                 }
3430                         }
3431                         # x-default link per https://support.google.com/webmasters/answer/189077?hl=en
3432                         $tags["variant-x-default"] = Html::element( 'link', array(
3433                                 'rel' => 'alternate',
3434                                 'hreflang' => 'x-default',
3435                                 'href' => $this->getTitle()->getLocalURL() ) );
3436                 }
3437
3438                 # Copyright
3439                 $copyright = '';
3440                 if ( $config->get( 'RightsPage' ) ) {
3441                         $copy = Title::newFromText( $config->get( 'RightsPage' ) );
3442
3443                         if ( $copy ) {
3444                                 $copyright = $copy->getLocalURL();
3445                         }
3446                 }
3447
3448                 if ( !$copyright && $config->get( 'RightsUrl' ) ) {
3449                         $copyright = $config->get( 'RightsUrl' );
3450                 }
3451
3452                 if ( $copyright ) {
3453                         $tags['copyright'] = Html::element( 'link', array(
3454                                 'rel' => 'copyright',
3455                                 'href' => $copyright )
3456                         );
3457                 }
3458
3459                 # Feeds
3460                 if ( $config->get( 'Feed' ) ) {
3461                         foreach ( $this->getSyndicationLinks() as $format => $link ) {
3462                                 # Use the page name for the title.  In principle, this could
3463                                 # lead to issues with having the same name for different feeds
3464                                 # corresponding to the same page, but we can't avoid that at
3465                                 # this low a level.
3466
3467                                 $tags[] = $this->feedLink(
3468                                         $format,
3469                                         $link,
3470                                         # Used messages: 'page-rss-feed' and 'page-atom-feed' (for an easier grep)
3471                                         $this->msg( "page-{$format}-feed", $this->getTitle()->getPrefixedText() )->text()
3472                                 );
3473                         }
3474
3475                         # Recent changes feed should appear on every page (except recentchanges,
3476                         # that would be redundant). Put it after the per-page feed to avoid
3477                         # changing existing behavior. It's still available, probably via a
3478                         # menu in your browser. Some sites might have a different feed they'd
3479                         # like to promote instead of the RC feed (maybe like a "Recent New Articles"
3480                         # or "Breaking news" one). For this, we see if $wgOverrideSiteFeed is defined.
3481                         # If so, use it instead.
3482                         $sitename = $config->get( 'Sitename' );
3483                         if ( $config->get( 'OverrideSiteFeed' ) ) {
3484                                 foreach ( $config->get( 'OverrideSiteFeed' ) as $type => $feedUrl ) {
3485                                         // Note, this->feedLink escapes the url.
3486                                         $tags[] = $this->feedLink(
3487                                                 $type,
3488                                                 $feedUrl,
3489                                                 $this->msg( "site-{$type}-feed", $sitename )->text()
3490                                         );
3491                                 }
3492                         } elseif ( !$this->getTitle()->isSpecial( 'Recentchanges' ) ) {
3493                                 $rctitle = SpecialPage::getTitleFor( 'Recentchanges' );
3494                                 foreach ( $config->get( 'AdvertisedFeedTypes' ) as $format ) {
3495                                         $tags[] = $this->feedLink(
3496                                                 $format,
3497                                                 $rctitle->getLocalURL( array( 'feed' => $format ) ),
3498                                                 # For grep: 'site-rss-feed', 'site-atom-feed'
3499                                                 $this->msg( "site-{$format}-feed", $sitename )->text()
3500                                         );
3501                                 }
3502                         }
3503                 }
3504
3505                 # Canonical URL
3506                 if ( $config->get( 'EnableCanonicalServerLink' ) ) {
3507                         if ( $canonicalUrl !== false ) {
3508                                 $canonicalUrl = wfExpandUrl( $canonicalUrl, PROTO_CANONICAL );
3509                         } else {
3510                                 $reqUrl = $this->getRequest()->getRequestURL();
3511                                 $canonicalUrl = wfExpandUrl( $reqUrl, PROTO_CANONICAL );
3512                         }
3513                 }
3514                 if ( $canonicalUrl !== false ) {
3515                         $tags[] = Html::element( 'link', array(
3516                                 'rel' => 'canonical',
3517                                 'href' => $canonicalUrl
3518                         ) );
3519                 }
3520
3521                 return $tags;
3522         }
3523
3524         /**
3525          * @return string HTML tag links to be put in the header.
3526          * @deprecated since 1.24 Use OutputPage::headElement or if you have to,
3527          *   OutputPage::getHeadLinksArray directly.
3528          */
3529         public function getHeadLinks() {
3530                 wfDeprecated( __METHOD__, '1.24' );
3531                 return implode( "\n", $this->getHeadLinksArray() );
3532         }
3533
3534         /**
3535          * Generate a "<link rel/>" for a feed.
3536          *
3537          * @param string $type Feed type
3538          * @param string $url URL to the feed
3539          * @param string $text Value of the "title" attribute
3540          * @return string HTML fragment
3541          */
3542         private function feedLink( $type, $url, $text ) {
3543                 return Html::element( 'link', array(
3544                         'rel' => 'alternate',
3545                         'type' => "application/$type+xml",
3546                         'title' => $text,
3547                         'href' => $url )
3548                 );
3549         }
3550
3551         /**
3552          * Add a local or specified stylesheet, with the given media options.
3553          * Meant primarily for internal use...
3554          *
3555          * @param string $style URL to the file
3556          * @param string $media To specify a media type, 'screen', 'printable', 'handheld' or any.
3557          * @param string $condition For IE conditional comments, specifying an IE version
3558          * @param string $dir Set to 'rtl' or 'ltr' for direction-specific sheets
3559          */
3560         public function addStyle( $style, $media = '', $condition = '', $dir = '' ) {
3561                 $options = array();
3562                 // Even though we expect the media type to be lowercase, but here we
3563                 // force it to lowercase to be safe.
3564                 if ( $media ) {
3565                         $options['media'] = $media;
3566                 }
3567                 if ( $condition ) {
3568                         $options['condition'] = $condition;
3569                 }
3570                 if ( $dir ) {
3571                         $options['dir'] = $dir;
3572                 }
3573                 $this->styles[$style] = $options;
3574         }
3575
3576         /**
3577          * Adds inline CSS styles
3578          * @param mixed $style_css Inline CSS
3579          * @param string $flip Set to 'flip' to flip the CSS if needed
3580          */
3581         public function addInlineStyle( $style_css, $flip = 'noflip' ) {
3582                 if ( $flip === 'flip' && $this->getLanguage()->isRTL() ) {
3583                         # If wanted, and the interface is right-to-left, flip the CSS
3584                         $style_css = CSSJanus::transform( $style_css, true, false );
3585                 }
3586                 $this->mInlineStyles .= Html::inlineStyle( $style_css ) . "\n";
3587         }
3588
3589         /**
3590          * Build a set of "<link>" elements for the stylesheets specified in the $this->styles array.
3591          * These will be applied to various media & IE conditionals.
3592          *
3593          * @return string
3594          */
3595         public function buildCssLinks() {
3596                 global $wgContLang;
3597
3598                 $this->getSkin()->setupSkinUserCss( $this );
3599
3600                 // Add ResourceLoader styles
3601                 // Split the styles into these groups
3602                 $styles = array(
3603                         'other' => array(),
3604                         'user' => array(),
3605                         'site' => array(),
3606                         'private' => array(),
3607                         'noscript' => array()
3608                 );
3609                 $links = array();
3610                 $otherTags = ''; // Tags to append after the normal <link> tags
3611                 $resourceLoader = $this->getResourceLoader();
3612
3613                 $moduleStyles = $this->getModuleStyles( true, 'top' );
3614
3615                 // Per-site custom styles
3616                 $moduleStyles[] = 'site';
3617                 $moduleStyles[] = 'noscript';
3618                 $moduleStyles[] = 'user.groups';
3619
3620                 // Per-user custom styles
3621                 if ( $this->getConfig()->get( 'AllowUserCss' ) && $this->getTitle()->isCssSubpage()
3622                         && $this->userCanPreview()
3623                 ) {
3624                         // We're on a preview of a CSS subpage
3625                         // Exclude this page from the user module in case it's in there (bug 26283)
3626                         $link = $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_STYLES, false,
3627                                 array( 'excludepage' => $this->getTitle()->getPrefixedDBkey() )
3628                         );
3629                         $otherTags .= $link['html'];
3630
3631                         // Load the previewed CSS
3632                         // If needed, Janus it first. This is user-supplied CSS, so it's
3633                         // assumed to be right for the content language directionality.
3634                         $previewedCSS = $this->getRequest()->getText( 'wpTextbox1' );
3635                         if ( $this->getLanguage()->getDir() !== $wgContLang->getDir() ) {
3636                                 $previewedCSS = CSSJanus::transform( $previewedCSS, true, false );
3637                         }
3638                         $otherTags .= Html::inlineStyle( $previewedCSS ) . "\n";
3639                 } else {
3640                         // Load the user styles normally
3641                         $moduleStyles[] = 'user';
3642                 }
3643
3644                 // Per-user preference styles
3645                 $moduleStyles[] = 'user.cssprefs';
3646
3647                 foreach ( $moduleStyles as $name ) {
3648                         $module = $resourceLoader->getModule( $name );
3649                         if ( !$module ) {
3650                                 continue;
3651                         }
3652                         $group = $module->getGroup();
3653                         // Modules in groups different than the ones listed on top (see $styles assignment)
3654                         // will be placed in the "other" group
3655                         $styles[isset( $styles[$group] ) ? $group : 'other'][] = $name;
3656                 }
3657
3658                 // We want site, private and user styles to override dynamically added
3659                 // styles from modules, but we want dynamically added styles to override
3660                 // statically added styles from other modules. So the order has to be
3661                 // other, dynamic, site, private, user. Add statically added styles for
3662                 // other modules
3663                 $links[] = $this->makeResourceLoaderLink( $styles['other'], ResourceLoaderModule::TYPE_STYLES );
3664                 // Add normal styles added through addStyle()/addInlineStyle() here
3665                 $links[] = implode( "\n", $this->buildCssLinksArray() ) . $this->mInlineStyles;
3666                 // Add marker tag to mark the place where the client-side loader should inject dynamic styles
3667                 // We use a <meta> tag with a made-up name for this because that's valid HTML
3668                 $links[] = Html::element(
3669                         'meta',
3670                         array( 'name' => 'ResourceLoaderDynamicStyles', 'content' => '' )
3671                 ) . "\n";
3672
3673                 // Add site, private and user styles
3674                 // 'private' at present only contains user.options, so put that before 'user'
3675                 // Any future private modules will likely have a similar user-specific character
3676                 foreach ( array( 'site', 'noscript', 'private', 'user' ) as $group ) {
3677                         $links[] = $this->makeResourceLoaderLink( $styles[$group],
3678                                 ResourceLoaderModule::TYPE_STYLES
3679                         );
3680                 }
3681
3682                 // Add stuff in $otherTags (previewed user CSS if applicable)
3683                 return self::getHtmlFromLoaderLinks( $links ) . $otherTags;
3684         }
3685
3686         /**
3687          * @return array
3688          */
3689         public function buildCssLinksArray() {
3690                 $links = array();
3691
3692                 // Add any extension CSS
3693                 foreach ( $this->mExtStyles as $url ) {
3694                         $this->addStyle( $url );
3695                 }
3696                 $this->mExtStyles = array();
3697
3698                 foreach ( $this->styles as $file => $options ) {
3699                         $link = $this->styleLink( $file, $options );
3700                         if ( $link ) {
3701                                 $links[$file] = $link;
3702                         }
3703                 }
3704                 return $links;
3705         }
3706
3707         /**
3708          * Generate \<link\> tags for stylesheets
3709          *
3710          * @param string $style URL to the file
3711          * @param array $options Option, can contain 'condition', 'dir', 'media' keys
3712          * @return string HTML fragment
3713          */
3714         protected function styleLink( $style, array $options ) {
3715                 if ( isset( $options['dir'] ) ) {
3716                         if ( $this->getLanguage()->getDir() != $options['dir'] ) {
3717                                 return '';
3718                         }
3719                 }
3720
3721                 if ( isset( $options['media'] ) ) {
3722                         $media = self::transformCssMedia( $options['media'] );
3723                         if ( is_null( $media ) ) {
3724                                 return '';
3725                         }
3726                 } else {
3727                         $media = 'all';
3728                 }
3729
3730                 if ( substr( $style, 0, 1 ) == '/' ||
3731                         substr( $style, 0, 5 ) == 'http:' ||
3732                         substr( $style, 0, 6 ) == 'https:' ) {
3733                         $url = $style;
3734                 } else {
3735                         $config = $this->getConfig();
3736                         $url = $config->get( 'StylePath' ) . '/' . $style . '?' . $config->get( 'StyleVersion' );
3737                 }
3738
3739                 $link = Html::linkedStyle( $url, $media );
3740
3741                 if ( isset( $options['condition'] ) ) {
3742                         $condition = htmlspecialchars( $options['condition'] );
3743                         $link = "<!--[if $condition]>$link<![endif]-->";
3744                 }
3745                 return $link;
3746         }
3747
3748         /**
3749          * Transform "media" attribute based on request parameters
3750          *
3751          * @param string $media Current value of the "media" attribute
3752          * @return string Modified value of the "media" attribute, or null to skip
3753          * this stylesheet
3754          */
3755         public static function transformCssMedia( $media ) {
3756                 global $wgRequest;
3757
3758                 // http://www.w3.org/TR/css3-mediaqueries/#syntax
3759                 $screenMediaQueryRegex = '/^(?:only\s+)?screen\b/i';
3760
3761                 // Switch in on-screen display for media testing
3762                 $switches = array(
3763                         'printable' => 'print',
3764                         'handheld' => 'handheld',
3765                 );
3766                 foreach ( $switches as $switch => $targetMedia ) {
3767                         if ( $wgRequest->getBool( $switch ) ) {
3768                                 if ( $media == $targetMedia ) {
3769                                         $media = '';
3770                                 } elseif ( preg_match( $screenMediaQueryRegex, $media ) === 1 ) {
3771                                         // This regex will not attempt to understand a comma-separated media_query_list
3772                                         //
3773                                         // Example supported values for $media:
3774                                         // 'screen', 'only screen', 'screen and (min-width: 982px)' ),
3775                                         // Example NOT supported value for $media:
3776                                         // '3d-glasses, screen, print and resolution > 90dpi'
3777                                         //
3778                                         // If it's a print request, we never want any kind of screen stylesheets
3779                                         // If it's a handheld request (currently the only other choice with a switch),
3780                                         // we don't want simple 'screen' but we might want screen queries that
3781                                         // have a max-width or something, so we'll pass all others on and let the
3782                                         // client do the query.
3783                                         if ( $targetMedia == 'print' || $media == 'screen' ) {
3784                                                 return null;
3785                                         }
3786                                 }
3787                         }
3788                 }
3789
3790                 return $media;
3791         }
3792
3793         /**
3794          * Add a wikitext-formatted message to the output.
3795          * This is equivalent to:
3796          *
3797          *    $wgOut->addWikiText( wfMessage( ... )->plain() )
3798          */
3799         public function addWikiMsg( /*...*/ ) {
3800                 $args = func_get_args();
3801                 $name = array_shift( $args );
3802                 $this->addWikiMsgArray( $name, $args );
3803         }
3804
3805         /**
3806          * Add a wikitext-formatted message to the output.
3807          * Like addWikiMsg() except the parameters are taken as an array
3808          * instead of a variable argument list.
3809          *
3810          * @param string $name
3811          * @param array $args
3812          */
3813         public function addWikiMsgArray( $name, $args ) {
3814                 $this->addHTML( $this->msg( $name, $args )->parseAsBlock() );
3815         }
3816
3817         /**
3818          * This function takes a number of message/argument specifications, wraps them in
3819          * some overall structure, and then parses the result and adds it to the output.
3820          *
3821          * In the $wrap, $1 is replaced with the first message, $2 with the second,
3822          * and so on. The subsequent arguments may be either
3823          * 1) strings, in which case they are message names, or
3824          * 2) arrays, in which case, within each array, the first element is the message
3825          *    name, and subsequent elements are the parameters to that message.
3826          *
3827          * Don't use this for messages that are not in the user's interface language.
3828          *
3829          * For example:
3830          *
3831          *    $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>", 'some-error' );
3832          *
3833          * Is equivalent to:
3834          *
3835          *    $wgOut->addWikiText( "<div class='error'>\n"
3836          *        . wfMessage( 'some-error' )->plain() . "\n</div>" );
3837          *
3838          * The newline after the opening div is needed in some wikitext. See bug 19226.
3839          *
3840          * @param string $wrap
3841          */
3842         public function wrapWikiMsg( $wrap /*, ...*/ ) {
3843                 $msgSpecs = func_get_args();
3844                 array_shift( $msgSpecs );
3845                 $msgSpecs = array_values( $msgSpecs );
3846                 $s = $wrap;
3847                 foreach ( $msgSpecs as $n => $spec ) {
3848                         if ( is_array( $spec ) ) {
3849                                 $args = $spec;
3850                                 $name = array_shift( $args );
3851                                 if ( isset( $args['options'] ) ) {
3852                                         unset( $args['options'] );
3853                                         wfDeprecated(
3854                                                 'Adding "options" to ' . __METHOD__ . ' is no longer supported',
3855                                                 '1.20'
3856                                         );
3857                                 }
3858                         } else {
3859                                 $args = array();
3860                                 $name = $spec;
3861                         }
3862                         $s = str_replace( '$' . ( $n + 1 ), $this->msg( $name, $args )->plain(), $s );
3863                 }
3864                 $this->addWikiText( $s );
3865         }
3866
3867         /**
3868          * Include jQuery core. Use this to avoid loading it multiple times
3869          * before we get a usable script loader.
3870          *
3871          * @param array $modules List of jQuery modules which should be loaded
3872          * @return array The list of modules which were not loaded.
3873          * @since 1.16
3874          * @deprecated since 1.17
3875          */
3876         public function includeJQuery( array $modules = array() ) {
3877                 return array();
3878         }
3879
3880         /**
3881          * Enables/disables TOC, doesn't override __NOTOC__
3882          * @param bool $flag
3883          * @since 1.22
3884          */
3885         public function enableTOC( $flag = true ) {
3886                 $this->mEnableTOC = $flag;
3887         }
3888
3889         /**
3890          * @return bool
3891          * @since 1.22
3892          */
3893         public function isTOCEnabled() {
3894                 return $this->mEnableTOC;
3895         }
3896
3897         /**
3898          * Enables/disables section edit links, doesn't override __NOEDITSECTION__
3899          * @param bool $flag
3900          * @since 1.23
3901          */
3902         public function enableSectionEditLinks( $flag = true ) {
3903                 $this->mEnableSectionEditLinks = $flag;
3904         }
3905
3906         /**
3907          * @return bool
3908          * @since 1.23
3909          */
3910         public function sectionEditLinksEnabled() {
3911                 return $this->mEnableSectionEditLinks;
3912         }
3913
3914         /**
3915          * Add ResourceLoader module styles for OOUI and set up the PHP implementation of it for use with
3916          * MediaWiki and this OutputPage instance.
3917          *
3918          * @since 1.25
3919          */
3920         public function enableOOUI() {
3921                 OOUI\Theme::setSingleton( new OOUI\MediaWikiTheme() );
3922                 OOUI\Element::setDefaultDir( $this->getLanguage()->getDir() );
3923                 $this->addModuleStyles( array(
3924                         'oojs-ui.styles',
3925                         'oojs-ui.styles.icons',
3926                         'oojs-ui.styles.indicators',
3927                         'oojs-ui.styles.textures',
3928                 ) );
3929         }
3930 }