includes/OutputPage.php

   1 <?php
   2 /**
   3  * Preparation for the final page rendering.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 use MediaWiki\Logger\LoggerFactory;
  24 use WrappedString\WrappedString;
  25
  26 /**
  27  * This class should be covered by a general architecture document which does
  28  * not exist as of January 2011.  This is one of the Core classes and should
  29  * be read at least once by any new developers.
  30  *
  31  * This class is used to prepare the final rendering. A skin is then
  32  * applied to the output parameters (links, javascript, html, categories ...).
  33  *
  34  * @todo FIXME: Another class handles sending the whole page to the client.
  35  *
  36  * Some comments comes from a pairing session between Zak Greant and Antoine Musso
  37  * in November 2010.
  38  *
  39  * @todo document
  40  */
  41 class OutputPage extends ContextSource {
  42         /** @var array Should be private. Used with addMeta() which adds "<meta>" */
  43         protected $mMetatags = array();
  44
  45         /** @var array */
  46         protected $mLinktags = array();
  47
  48         /** @var bool */
  49         protected $mCanonicalUrl = false;
  50
  51         /**
  52          * @var array Additional stylesheets. Looks like this is for extensions.
  53          *   Might be replaced by resource loader.
  54          */
  55         protected $mExtStyles = array();
  56
  57         /**
  58          * @var string Should be private - has getter and setter. Contains
  59          *   the HTML title */
  60         public $mPagetitle = '';
  61
  62         /**
  63          * @var string Contains all of the "<body>" content. Should be private we
  64          *   got set/get accessors and the append() method.
  65          */
  66         public $mBodytext = '';
  67
  68         /**
  69          * Holds the debug lines that will be output as comments in page source if
  70          * $wgDebugComments is enabled. See also $wgShowDebug.
  71          * @deprecated since 1.20; use MWDebug class instead.
  72          */
  73         public $mDebugtext = '';
  74
  75         /** @var string Stores contents of "<title>" tag */
  76         private $mHTMLtitle = '';
  77
  78         /**
  79          * @var bool Is the displayed content related to the source of the
  80          *   corresponding wiki article.
  81          */
  82         private $mIsarticle = false;
  83
  84         /** @var bool Stores "article flag" toggle. */
  85         private $mIsArticleRelated = true;
  86
  87         /**
  88          * @var bool We have to set isPrintable(). Some pages should
  89          * never be printed (ex: redirections).
  90          */
  91         private $mPrintable = false;
  92
  93         /**
  94          * @var array Contains the page subtitle. Special pages usually have some
  95          *   links here. Don't confuse with site subtitle added by skins.
  96          */
  97         private $mSubtitle = array();
  98
  99         /** @var string */
 100         public $mRedirect = '';
 101
 102         /** @var int */
 103         protected $mStatusCode;
 104
 105         /**
 106          * @var string Variable mLastModified and mEtag are used for sending cache control.
 107          *   The whole caching system should probably be moved into its own class.
 108          */
 109         protected $mLastModified = '';
 110
 111         /**
 112          * Contains an HTTP Entity Tags (see RFC 2616 section 3.13) which is used
 113          * as a unique identifier for the content. It is later used by the client
 114          * to compare its cached version with the server version. Client sends
 115          * headers If-Match and If-None-Match containing its locally cached ETAG value.
 116          *
 117          * To get more information, you will have to look at HTTP/1.1 protocol which
 118          * is properly described in RFC 2616 : http://tools.ietf.org/html/rfc2616
 119          */
 120         private $mETag = false;
 121
 122         /** @var array */
 123         protected $mCategoryLinks = array();
 124
 125         /** @var array */
 126         protected $mCategories = array();
 127
 128         /** @var array */
 129         protected $mIndicators = array();
 130
 131         /** @var array Array of Interwiki Prefixed (non DB key) Titles (e.g. 'fr:Test page') */
 132         private $mLanguageLinks = array();
 133
 134         /**
 135          * Used for JavaScript (pre resource loader)
 136          * @todo We should split JS / CSS.
 137          * mScripts content is inserted as is in "<head>" by Skin. This might
 138          * contain either a link to a stylesheet or inline CSS.
 139          */
 140         private $mScripts = '';
 141
 142         /** @var string Inline CSS styles. Use addInlineStyle() sparingly */
 143         protected $mInlineStyles = '';
 144
 145         /** @todo Unused? */
 146         private $mLinkColours;
 147
 148         /**
 149          * @var string Used by skin template.
 150          * Example: $tpl->set( 'displaytitle', $out->mPageLinkTitle );
 151          */
 152         public $mPageLinkTitle = '';
 153
 154         /** @var array Array of elements in "<head>". Parser might add its own headers! */
 155         protected $mHeadItems = array();
 156
 157         // @todo FIXME: Next 5 variables probably come from the resource loader
 158
 159         /** @var array */
 160         protected $mModules = array();
 161
 162         /** @var array */
 163         protected $mModuleScripts = array();
 164
 165         /** @var array */
 166         protected $mModuleStyles = array();
 167
 168         /** @var ResourceLoader */
 169         protected $mResourceLoader;
 170
 171         /** @var array */
 172         protected $mJsConfigVars = array();
 173
 174         /** @var array */
 175         protected $mTemplateIds = array();
 176
 177         /** @var array */
 178         protected $mImageTimeKeys = array();
 179
 180         /** @var string */
 181         public $mRedirectCode = '';
 182
 183         protected $mFeedLinksAppendQuery = null;
 184
 185         /** @var array
 186          * What level of 'untrustworthiness' is allowed in CSS/JS modules loaded on this page?
 187          * @see ResourceLoaderModule::$origin
 188          * ResourceLoaderModule::ORIGIN_ALL is assumed unless overridden;
 189          */
 190         protected $mAllowedModules = array(
 191                 ResourceLoaderModule::TYPE_COMBINED => ResourceLoaderModule::ORIGIN_ALL,
 192         );
 193
 194         /** @var bool Whether output is disabled.  If this is true, the 'output' method will do nothing. */
 195         protected $mDoNothing = false;
 196
 197         // Parser related.
 198
 199         /** @var int */
 200         protected $mContainsNewMagic = 0;
 201
 202         /**
 203          * lazy initialised, use parserOptions()
 204          * @var ParserOptions
 205          */
 206         protected $mParserOptions = null;
 207
 208         /**
 209          * Handles the Atom / RSS links.
 210          * We probably only support Atom in 2011.
 211          * @see $wgAdvertisedFeedTypes
 212          */
 213         private $mFeedLinks = array();
 214
 215         // Gwicke work on squid caching? Roughly from 2003.
 216         protected $mEnableClientCache = true;
 217
 218         /** @var bool Flag if output should only contain the body of the article. */
 219         private $mArticleBodyOnly = false;
 220
 221         /** @var bool */
 222         protected $mNewSectionLink = false;
 223
 224         /** @var bool */
 225         protected $mHideNewSectionLink = false;
 226
 227         /**
 228          * @var bool Comes from the parser. This was probably made to load CSS/JS
 229          * only if we had "<gallery>". Used directly in CategoryPage.php.
 230          * Looks like resource loader can replace this.
 231          */
 232         public $mNoGallery = false;
 233
 234         /** @var string */
 235         private $mPageTitleActionText = '';
 236
 237         /** @var array */
 238         private $mParseWarnings = array();
 239
 240         /** @var int Cache stuff. Looks like mEnableClientCache */
 241         protected $mSquidMaxage = 0;
 242
 243         /**
 244          * @var bool Controls if anti-clickjacking / frame-breaking headers will
 245          * be sent. This should be done for pages where edit actions are possible.
 246          * Setters: $this->preventClickjacking() and $this->allowClickjacking().
 247          */
 248         protected $mPreventClickjacking = true;
 249
 250         /** @var int To include the variable {{REVISIONID}} */
 251         private $mRevisionId = null;
 252
 253         /** @var string */
 254         private $mRevisionTimestamp = null;
 255
 256         /** @var array */
 257         protected $mFileVersion = null;
 258
 259         /**
 260          * @var array An array of stylesheet filenames (relative from skins path),
 261          * with options for CSS media, IE conditions, and RTL/LTR direction.
 262          * For internal use; add settings in the skin via $this->addStyle()
 263          *
 264          * Style again! This seems like a code duplication since we already have
 265          * mStyles. This is what makes Open Source amazing.
 266          */
 267         protected $styles = array();
 268
 269         /**
 270          * Whether jQuery is already handled.
 271          */
 272         protected $mJQueryDone = false;
 273
 274         private $mIndexPolicy = 'index';
 275         private $mFollowPolicy = 'follow';
 276         private $mVaryHeader = array(
 277                 'Accept-Encoding' => array( 'list-contains=gzip' ),
 278         );
 279
 280         /**
 281          * If the current page was reached through a redirect, $mRedirectedFrom contains the Title
 282          * of the redirect.
 283          *
 284          * @var Title
 285          */
 286         private $mRedirectedFrom = null;
 287
 288         /**
 289          * Additional key => value data
 290          */
 291         private $mProperties = array();
 292
 293         /**
 294          * @var string|null ResourceLoader target for load.php links. If null, will be omitted
 295          */
 296         private $mTarget = null;
 297
 298         /**
 299          * @var bool Whether parser output should contain table of contents
 300          */
 301         private $mEnableTOC = true;
 302
 303         /**
 304          * @var bool Whether parser output should contain section edit links
 305          */
 306         private $mEnableSectionEditLinks = true;
 307
 308         /**
 309          * @var string|null The URL to send in a <link> element with rel=copyright
 310          */
 311         private $copyrightUrl;
 312
 313         /**
 314          * Constructor for OutputPage. This should not be called directly.
 315          * Instead a new RequestContext should be created and it will implicitly create
 316          * a OutputPage tied to that context.
 317          * @param IContextSource|null $context
 318          */
 319         function __construct( IContextSource $context = null ) {
 320                 if ( $context === null ) {
 321                         # Extensions should use `new RequestContext` instead of `new OutputPage` now.
 322                         wfDeprecated( __METHOD__, '1.18' );
 323                 } else {
 324                         $this->setContext( $context );
 325                 }
 326         }
 327
 328         /**
 329          * Redirect to $url rather than displaying the normal page
 330          *
 331          * @param string $url URL
 332          * @param string $responsecode HTTP status code
 333          */
 334         public function redirect( $url, $responsecode = '302' ) {
 335                 # Strip newlines as a paranoia check for header injection in PHP<5.1.2
 336                 $this->mRedirect = str_replace( "\n", '', $url );
 337                 $this->mRedirectCode = $responsecode;
 338         }
 339
 340         /**
 341          * Get the URL to redirect to, or an empty string if not redirect URL set
 342          *
 343          * @return string
 344          */
 345         public function getRedirect() {
 346                 return $this->mRedirect;
 347         }
 348
 349         /**
 350          * Set the copyright URL to send with the output.
 351          * Empty string to omit, null to reset.
 352          *
 353          * @since 1.26
 354          *
 355          * @param string|null $url
 356          */
 357         public function setCopyrightUrl( $url ) {
 358                 $this->copyrightUrl = $url;
 359         }
 360
 361         /**
 362          * Set the HTTP status code to send with the output.
 363          *
 364          * @param int $statusCode
 365          */
 366         public function setStatusCode( $statusCode ) {
 367                 $this->mStatusCode = $statusCode;
 368         }
 369
 370         /**
 371          * Add a new "<meta>" tag
 372          * To add an http-equiv meta tag, precede the name with "http:"
 373          *
 374          * @param string $name Tag name
 375          * @param string $val Tag value
 376          */
 377         function addMeta( $name, $val ) {
 378                 array_push( $this->mMetatags, array( $name, $val ) );
 379         }
 380
 381         /**
 382          * Returns the current <meta> tags
 383          *
 384          * @since 1.25
 385          * @return array
 386          */
 387         public function getMetaTags() {
 388                 return $this->mMetatags;
 389         }
 390
 391         /**
 392          * Add a new \<link\> tag to the page header.
 393          *
 394          * Note: use setCanonicalUrl() for rel=canonical.
 395          *
 396          * @param array $linkarr Associative array of attributes.
 397          */
 398         function addLink( array $linkarr ) {
 399                 array_push( $this->mLinktags, $linkarr );
 400         }
 401
 402         /**
 403          * Returns the current <link> tags
 404          *
 405          * @since 1.25
 406          * @return array
 407          */
 408         public function getLinkTags() {
 409                 return $this->mLinktags;
 410         }
 411
 412         /**
 413          * Add a new \<link\> with "rel" attribute set to "meta"
 414          *
 415          * @param array $linkarr Associative array mapping attribute names to their
 416          *                 values, both keys and values will be escaped, and the
 417          *                 "rel" attribute will be automatically added
 418          */
 419         function addMetadataLink( array $linkarr ) {
 420                 $linkarr['rel'] = $this->getMetadataAttribute();
 421                 $this->addLink( $linkarr );
 422         }
 423
 424         /**
 425          * Set the URL to be used for the <link rel=canonical>. This should be used
 426          * in preference to addLink(), to avoid duplicate link tags.
 427          * @param string $url
 428          */
 429         function setCanonicalUrl( $url ) {
 430                 $this->mCanonicalUrl = $url;
 431         }
 432
 433         /**
 434          * Returns the URL to be used for the <link rel=canonical> if
 435          * one is set.
 436          *
 437          * @since 1.25
 438          * @return bool|string
 439          */
 440         public function getCanonicalUrl() {
 441                 return $this->mCanonicalUrl;
 442         }
 443
 444         /**
 445          * Get the value of the "rel" attribute for metadata links
 446          *
 447          * @return string
 448          */
 449         public function getMetadataAttribute() {
 450                 # note: buggy CC software only reads first "meta" link
 451                 static $haveMeta = false;
 452                 if ( $haveMeta ) {
 453                         return 'alternate meta';
 454                 } else {
 455                         $haveMeta = true;
 456                         return 'meta';
 457                 }
 458         }
 459
 460         /**
 461          * Add raw HTML to the list of scripts (including \<script\> tag, etc.)
 462          *
 463          * @param string $script Raw HTML
 464          */
 465         function addScript( $script ) {
 466                 $this->mScripts .= $script . "\n";
 467         }
 468
 469         /**
 470          * Register and add a stylesheet from an extension directory.
 471          *
 472          * @param string $url Path to sheet.  Provide either a full url (beginning
 473          *             with 'http', etc) or a relative path from the document root
 474          *             (beginning with '/').  Otherwise it behaves identically to
 475          *             addStyle() and draws from the /skins folder.
 476          */
 477         public function addExtensionStyle( $url ) {
 478                 array_push( $this->mExtStyles, $url );
 479         }
 480
 481         /**
 482          * Get all styles added by extensions
 483          *
 484          * @return array
 485          */
 486         function getExtStyle() {
 487                 return $this->mExtStyles;
 488         }
 489
 490         /**
 491          * Add a JavaScript file out of skins/common, or a given relative path.
 492          *
 493          * @param string $file Filename in skins/common or complete on-server path
 494          *              (/foo/bar.js)
 495          * @param string $version Style version of the file. Defaults to $wgStyleVersion
 496          */
 497         public function addScriptFile( $file, $version = null ) {
 498                 // See if $file parameter is an absolute URL or begins with a slash
 499                 if ( substr( $file, 0, 1 ) == '/' || preg_match( '#^[a-z]*://#i', $file ) ) {
 500                         $path = $file;
 501                 } else {
 502                         $path = $this->getConfig()->get( 'StylePath' ) . "/common/{$file}";
 503                 }
 504                 if ( is_null( $version ) ) {
 505                         $version = $this->getConfig()->get( 'StyleVersion' );
 506                 }
 507                 $this->addScript( Html::linkedScript( wfAppendQuery( $path, $version ) ) );
 508         }
 509
 510         /**
 511          * Add a self-contained script tag with the given contents
 512          *
 513          * @param string $script JavaScript text, no "<script>" tags
 514          */
 515         public function addInlineScript( $script ) {
 516                 $this->mScripts .= Html::inlineScript( "\n$script\n" ) . "\n";
 517         }
 518
 519         /**
 520          * Get all registered JS and CSS tags for the header.
 521          *
 522          * @return string
 523          * @deprecated since 1.24 Use OutputPage::headElement to build the full header.
 524          */
 525         function getScript() {
 526                 wfDeprecated( __METHOD__, '1.24' );
 527                 return $this->mScripts . $this->getHeadItems();
 528         }
 529
 530         /**
 531          * Filter an array of modules to remove insufficiently trustworthy members, and modules
 532          * which are no longer registered (eg a page is cached before an extension is disabled)
 533          * @param array $modules
 534          * @param string|null $position If not null, only return modules with this position
 535          * @param string $type
 536          * @return array
 537          */
 538         protected function filterModules( array $modules, $position = null,
 539                 $type = ResourceLoaderModule::TYPE_COMBINED
 540         ) {
 541                 $resourceLoader = $this->getResourceLoader();
 542                 $filteredModules = array();
 543                 foreach ( $modules as $val ) {
 544                         $module = $resourceLoader->getModule( $val );
 545                         if ( $module instanceof ResourceLoaderModule
 546                                 && $module->getOrigin() <= $this->getAllowedModules( $type )
 547                                 && ( is_null( $position ) || $module->getPosition() == $position )
 548                                 && ( !$this->mTarget || in_array( $this->mTarget, $module->getTargets() ) )
 549                         ) {
 550                                 $filteredModules[] = $val;
 551                         }
 552                 }
 553                 return $filteredModules;
 554         }
 555
 556         /**
 557          * Get the list of modules to include on this page
 558          *
 559          * @param bool $filter Whether to filter out insufficiently trustworthy modules
 560          * @param string|null $position If not null, only return modules with this position
 561          * @param string $param
 562          * @return array Array of module names
 563          */
 564         public function getModules( $filter = false, $position = null, $param = 'mModules' ) {
 565                 $modules = array_values( array_unique( $this->$param ) );
 566                 return $filter
 567                         ? $this->filterModules( $modules, $position )
 568                         : $modules;
 569         }
 570
 571         /**
 572          * Add one or more modules recognized by the resource loader. Modules added
 573          * through this function will be loaded by the resource loader when the
 574          * page loads.
 575          *
 576          * @param string|array $modules Module name (string) or array of module names
 577          */
 578         public function addModules( $modules ) {
 579                 $this->mModules = array_merge( $this->mModules, (array)$modules );
 580         }
 581
 582         /**
 583          * Get the list of module JS to include on this page
 584          *
 585          * @param bool $filter
 586          * @param string|null $position
 587          *
 588          * @return array Array of module names
 589          */
 590         public function getModuleScripts( $filter = false, $position = null ) {
 591                 return $this->getModules( $filter, $position, 'mModuleScripts' );
 592         }
 593
 594         /**
 595          * Add only JS of one or more modules recognized by the resource loader. Module
 596          * scripts added through this function will be loaded by the resource loader when
 597          * the page loads.
 598          *
 599          * @param string|array $modules Module name (string) or array of module names
 600          */
 601         public function addModuleScripts( $modules ) {
 602                 $this->mModuleScripts = array_merge( $this->mModuleScripts, (array)$modules );
 603         }
 604
 605         /**
 606          * Get the list of module CSS to include on this page
 607          *
 608          * @param bool $filter
 609          * @param string|null $position
 610          *
 611          * @return array Array of module names
 612          */
 613         public function getModuleStyles( $filter = false, $position = null ) {
 614                 // T97420
 615                 $resourceLoader = $this->getResourceLoader();
 616
 617                 foreach ( $this->mModuleStyles as $val ) {
 618                         $module = $resourceLoader->getModule( $val );
 619
 620                         if ( $module instanceof ResourceLoaderModule && $module->isPositionDefault() ) {
 621                                 $warning = __METHOD__ . ': style module should define its position explicitly: ' .
 622                                         $val . ' ' . get_class( $module );
 623                                 wfDebugLog( 'resourceloader', $warning );
 624                                 wfLogWarning( $warning );
 625                         }
 626                 }
 627
 628                 return $this->getModules( $filter, $position, 'mModuleStyles' );
 629         }
 630
 631         /**
 632          * Add only CSS of one or more modules recognized by the resource loader.
 633          *
 634          * Module styles added through this function will be added using standard link CSS
 635          * tags, rather than as a combined Javascript and CSS package. Thus, they will
 636          * load when JavaScript is disabled (unless CSS also happens to be disabled).
 637          *
 638          * @param string|array $modules Module name (string) or array of module names
 639          */
 640         public function addModuleStyles( $modules ) {
 641                 $this->mModuleStyles = array_merge( $this->mModuleStyles, (array)$modules );
 642         }
 643
 644         /**
 645          * Get the list of module messages to include on this page
 646          *
 647          * @deprecated since 1.26 Obsolete
 648          * @param bool $filter
 649          * @param string|null $position
 650          * @return array Array of module names
 651          */
 652         public function getModuleMessages( $filter = false, $position = null ) {
 653                 wfDeprecated( __METHOD__, '1.26' );
 654                 return array();
 655         }
 656
 657         /**
 658          * Load messages of one or more ResourceLoader modules.
 659          *
 660          * @deprecated since 1.26 Use addModules() instead
 661          * @param string|array $modules Module name (string) or array of module names
 662          */
 663         public function addModuleMessages( $modules ) {
 664                 wfDeprecated( __METHOD__, '1.26' );
 665         }
 666
 667         /**
 668          * @return null|string ResourceLoader target
 669          */
 670         public function getTarget() {
 671                 return $this->mTarget;
 672         }
 673
 674         /**
 675          * Sets ResourceLoader target for load.php links. If null, will be omitted
 676          *
 677          * @param string|null $target
 678          */
 679         public function setTarget( $target ) {
 680                 $this->mTarget = $target;
 681         }
 682
 683         /**
 684          * Get an array of head items
 685          *
 686          * @return array
 687          */
 688         function getHeadItemsArray() {
 689                 return $this->mHeadItems;
 690         }
 691
 692         /**
 693          * Get all header items in a string
 694          *
 695          * @return string
 696          * @deprecated since 1.24 Use OutputPage::headElement or
 697          *   if absolutely necessary use OutputPage::getHeadItemsArray
 698          */
 699         function getHeadItems() {
 700                 wfDeprecated( __METHOD__, '1.24' );
 701                 $s = '';
 702                 foreach ( $this->mHeadItems as $item ) {
 703                         $s .= $item;
 704                 }
 705                 return $s;
 706         }
 707
 708         /**
 709          * Add or replace an header item to the output
 710          *
 711          * @param string $name Item name
 712          * @param string $value Raw HTML
 713          */
 714         public function addHeadItem( $name, $value ) {
 715                 $this->mHeadItems[$name] = $value;
 716         }
 717
 718         /**
 719          * Check if the header item $name is already set
 720          *
 721          * @param string $name Item name
 722          * @return bool
 723          */
 724         public function hasHeadItem( $name ) {
 725                 return isset( $this->mHeadItems[$name] );
 726         }
 727
 728         /**
 729          * Set the value of the ETag HTTP header, only used if $wgUseETag is true
 730          *
 731          * @param string $tag Value of "ETag" header
 732          */
 733         function setETag( $tag ) {
 734                 $this->mETag = $tag;
 735         }
 736
 737         /**
 738          * Set whether the output should only contain the body of the article,
 739          * without any skin, sidebar, etc.
 740          * Used e.g. when calling with "action=render".
 741          *
 742          * @param bool $only Whether to output only the body of the article
 743          */
 744         public function setArticleBodyOnly( $only ) {
 745                 $this->mArticleBodyOnly = $only;
 746         }
 747
 748         /**
 749          * Return whether the output will contain only the body of the article
 750          *
 751          * @return bool
 752          */
 753         public function getArticleBodyOnly() {
 754                 return $this->mArticleBodyOnly;
 755         }
 756
 757         /**
 758          * Set an additional output property
 759          * @since 1.21
 760          *
 761          * @param string $name
 762          * @param mixed $value
 763          */
 764         public function setProperty( $name, $value ) {
 765                 $this->mProperties[$name] = $value;
 766         }
 767
 768         /**
 769          * Get an additional output property
 770          * @since 1.21
 771          *
 772          * @param string $name
 773          * @return mixed Property value or null if not found
 774          */
 775         public function getProperty( $name ) {
 776                 if ( isset( $this->mProperties[$name] ) ) {
 777                         return $this->mProperties[$name];
 778                 } else {
 779                         return null;
 780                 }
 781         }
 782
 783         /**
 784          * checkLastModified tells the client to use the client-cached page if
 785          * possible. If successful, the OutputPage is disabled so that
 786          * any future call to OutputPage->output() have no effect.
 787          *
 788          * Side effect: sets mLastModified for Last-Modified header
 789          *
 790          * @param string $timestamp
 791          *
 792          * @return bool True if cache-ok headers was sent.
 793          */
 794         public function checkLastModified( $timestamp ) {
 795                 if ( !$timestamp || $timestamp == '19700101000000' ) {
 796                         wfDebug( __METHOD__ . ": CACHE DISABLED, NO TIMESTAMP\n" );
 797                         return false;
 798                 }
 799                 $config = $this->getConfig();
 800                 if ( !$config->get( 'CachePages' ) ) {
 801                         wfDebug( __METHOD__ . ": CACHE DISABLED\n" );
 802                         return false;
 803                 }
 804
 805                 $timestamp = wfTimestamp( TS_MW, $timestamp );
 806                 $modifiedTimes = array(
 807                         'page' => $timestamp,
 808                         'user' => $this->getUser()->getTouched(),
 809                         'epoch' => $config->get( 'CacheEpoch' )
 810                 );
 811                 if ( $config->get( 'UseSquid' ) ) {
 812                         // bug 44570: the core page itself may not change, but resources might
 813                         $modifiedTimes['sepoch'] = wfTimestamp( TS_MW, time() - $config->get( 'SquidMaxage' ) );
 814                 }
 815                 Hooks::run( 'OutputPageCheckLastModified', array( &$modifiedTimes ) );
 816
 817                 $maxModified = max( $modifiedTimes );
 818                 $this->mLastModified = wfTimestamp( TS_RFC2822, $maxModified );
 819
 820                 $clientHeader = $this->getRequest()->getHeader( 'If-Modified-Since' );
 821                 if ( $clientHeader === false ) {
 822                         wfDebug( __METHOD__ . ": client did not send If-Modified-Since header\n", 'log' );
 823                         return false;
 824                 }
 825
 826                 # IE sends sizes after the date like this:
 827                 # Wed, 20 Aug 2003 06:51:19 GMT; length=5202
 828                 # this breaks strtotime().
 829                 $clientHeader = preg_replace( '/;.*$/', '', $clientHeader );
 830
 831                 MediaWiki\suppressWarnings(); // E_STRICT system time bitching
 832                 $clientHeaderTime = strtotime( $clientHeader );
 833                 MediaWiki\restoreWarnings();
 834                 if ( !$clientHeaderTime ) {
 835                         wfDebug( __METHOD__
 836                                 . ": unable to parse the client's If-Modified-Since header: $clientHeader\n" );
 837                         return false;
 838                 }
 839                 $clientHeaderTime = wfTimestamp( TS_MW, $clientHeaderTime );
 840
 841                 # Make debug info
 842                 $info = '';
 843                 foreach ( $modifiedTimes as $name => $value ) {
 844                         if ( $info !== '' ) {
 845                                 $info .= ', ';
 846                         }
 847                         $info .= "$name=" . wfTimestamp( TS_ISO_8601, $value );
 848                 }
 849
 850                 wfDebug( __METHOD__ . ": client sent If-Modified-Since: " .
 851                         wfTimestamp( TS_ISO_8601, $clientHeaderTime ) . "\n", 'log' );
 852                 wfDebug( __METHOD__ . ": effective Last-Modified: " .
 853                         wfTimestamp( TS_ISO_8601, $maxModified ) . "\n", 'log' );
 854                 if ( $clientHeaderTime < $maxModified ) {
 855                         wfDebug( __METHOD__ . ": STALE, $info\n", 'log' );
 856                         return false;
 857                 }
 858
 859                 # Not modified
 860                 # Give a 304 Not Modified response code and disable body output
 861                 wfDebug( __METHOD__ . ": NOT MODIFIED, $info\n", 'log' );
 862                 ini_set( 'zlib.output_compression', 0 );
 863                 $this->getRequest()->response()->statusHeader( 304 );
 864                 $this->sendCacheControl();
 865                 $this->disable();
 866
 867                 // Don't output a compressed blob when using ob_gzhandler;
 868                 // it's technically against HTTP spec and seems to confuse
 869                 // Firefox when the response gets split over two packets.
 870                 wfClearOutputBuffers();
 871
 872                 return true;
 873         }
 874
 875         /**
 876          * Override the last modified timestamp
 877          *
 878          * @param string $timestamp New timestamp, in a format readable by
 879          *        wfTimestamp()
 880          */
 881         public function setLastModified( $timestamp ) {
 882                 $this->mLastModified = wfTimestamp( TS_RFC2822, $timestamp );
 883         }
 884
 885         /**
 886          * Set the robot policy for the page: <http://www.robotstxt.org/meta.html>
 887          *
 888          * @param string $policy The literal string to output as the contents of
 889          *   the meta tag.  Will be parsed according to the spec and output in
 890          *   standardized form.
 891          * @return null
 892          */
 893         public function setRobotPolicy( $policy ) {
 894                 $policy = Article::formatRobotPolicy( $policy );
 895
 896                 if ( isset( $policy['index'] ) ) {
 897                         $this->setIndexPolicy( $policy['index'] );
 898                 }
 899                 if ( isset( $policy['follow'] ) ) {
 900                         $this->setFollowPolicy( $policy['follow'] );
 901                 }
 902         }
 903
 904         /**
 905          * Set the index policy for the page, but leave the follow policy un-
 906          * touched.
 907          *
 908          * @param string $policy Either 'index' or 'noindex'.
 909          * @return null
 910          */
 911         public function setIndexPolicy( $policy ) {
 912                 $policy = trim( $policy );
 913                 if ( in_array( $policy, array( 'index', 'noindex' ) ) ) {
 914                         $this->mIndexPolicy = $policy;
 915                 }
 916         }
 917
 918         /**
 919          * Set the follow policy for the page, but leave the index policy un-
 920          * touched.
 921          *
 922          * @param string $policy Either 'follow' or 'nofollow'.
 923          * @return null
 924          */
 925         public function setFollowPolicy( $policy ) {
 926                 $policy = trim( $policy );
 927                 if ( in_array( $policy, array( 'follow', 'nofollow' ) ) ) {
 928                         $this->mFollowPolicy = $policy;
 929                 }
 930         }
 931
 932         /**
 933          * Set the new value of the "action text", this will be added to the
 934          * "HTML title", separated from it with " - ".
 935          *
 936          * @param string $text New value of the "action text"
 937          */
 938         public function setPageTitleActionText( $text ) {
 939                 $this->mPageTitleActionText = $text;
 940         }
 941
 942         /**
 943          * Get the value of the "action text"
 944          *
 945          * @return string
 946          */
 947         public function getPageTitleActionText() {
 948                 return $this->mPageTitleActionText;
 949         }
 950
 951         /**
 952          * "HTML title" means the contents of "<title>".
 953          * It is stored as plain, unescaped text and will be run through htmlspecialchars in the skin file.
 954          *
 955          * @param string|Message $name
 956          */
 957         public function setHTMLTitle( $name ) {
 958                 if ( $name instanceof Message ) {
 959                         $this->mHTMLtitle = $name->setContext( $this->getContext() )->text();
 960                 } else {
 961                         $this->mHTMLtitle = $name;
 962                 }
 963         }
 964
 965         /**
 966          * Return the "HTML title", i.e. the content of the "<title>" tag.
 967          *
 968          * @return string
 969          */
 970         public function getHTMLTitle() {
 971                 return $this->mHTMLtitle;
 972         }
 973
 974         /**
 975          * Set $mRedirectedFrom, the Title of the page which redirected us to the current page.
 976          *
 977          * @param Title $t
 978          */
 979         public function setRedirectedFrom( $t ) {
 980                 $this->mRedirectedFrom = $t;
 981         }
 982
 983         /**
 984          * "Page title" means the contents of \<h1\>. It is stored as a valid HTML
 985          * fragment. This function allows good tags like \<sup\> in the \<h1\> tag,
 986          * but not bad tags like \<script\>. This function automatically sets
 987          * \<title\> to the same content as \<h1\> but with all tags removed. Bad
 988          * tags that were escaped in \<h1\> will still be escaped in \<title\>, and
 989          * good tags like \<i\> will be dropped entirely.
 990          *
 991          * @param string|Message $name
 992          */
 993         public function setPageTitle( $name ) {
 994                 if ( $name instanceof Message ) {
 995                         $name = $name->setContext( $this->getContext() )->text();
 996                 }
 997
 998                 # change "<script>foo&bar</script>" to "&lt;script&gt;foo&amp;bar&lt;/script&gt;"
 999                 # but leave "<i>foobar</i>" alone
1000                 $nameWithTags = Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags( $name ) );
1001                 $this->mPagetitle = $nameWithTags;
1002
1003                 # change "<i>foo&amp;bar</i>" to "foo&bar"
1004                 $this->setHTMLTitle(
1005                         $this->msg( 'pagetitle' )->rawParams( Sanitizer::stripAllTags( $nameWithTags ) )
1006                                 ->inContentLanguage()
1007                 );
1008         }
1009
1010         /**
1011          * Return the "page title", i.e. the content of the \<h1\> tag.
1012          *
1013          * @return string
1014          */
1015         public function getPageTitle() {
1016                 return $this->mPagetitle;
1017         }
1018
1019         /**
1020          * Set the Title object to use
1021          *
1022          * @param Title $t
1023          */
1024         public function setTitle( Title $t ) {
1025                 $this->getContext()->setTitle( $t );
1026         }
1027
1028         /**
1029          * Replace the subtitle with $str
1030          *
1031          * @param string|Message $str New value of the subtitle. String should be safe HTML.
1032          */
1033         public function setSubtitle( $str ) {
1034                 $this->clearSubtitle();
1035                 $this->addSubtitle( $str );
1036         }
1037
1038         /**
1039          * Add $str to the subtitle
1040          *
1041          * @deprecated since 1.19; use addSubtitle() instead
1042          * @param string|Message $str String or Message to add to the subtitle
1043          */
1044         public function appendSubtitle( $str ) {
1045                 $this->addSubtitle( $str );
1046         }
1047
1048         /**
1049          * Add $str to the subtitle
1050          *
1051          * @param string|Message $str String or Message to add to the subtitle. String should be safe HTML.
1052          */
1053         public function addSubtitle( $str ) {
1054                 if ( $str instanceof Message ) {
1055                         $this->mSubtitle[] = $str->setContext( $this->getContext() )->parse();
1056                 } else {
1057                         $this->mSubtitle[] = $str;
1058                 }
1059         }
1060
1061         /**
1062          * Build message object for a subtitle containing a backlink to a page
1063          *
1064          * @param Title $title Title to link to
1065          * @param array $query Array of additional parameters to include in the link
1066          * @return Message
1067          * @since 1.25
1068          */
1069         public static function buildBacklinkSubtitle( Title $title, $query = array() ) {
1070                 if ( $title->isRedirect() ) {
1071                         $query['redirect'] = 'no';
1072                 }
1073                 return wfMessage( 'backlinksubtitle' )
1074                         ->rawParams( Linker::link( $title, null, array(), $query ) );
1075         }
1076
1077         /**
1078          * Add a subtitle containing a backlink to a page
1079          *
1080          * @param Title $title Title to link to
1081          * @param array $query Array of additional parameters to include in the link
1082          */
1083         public function addBacklinkSubtitle( Title $title, $query = array() ) {
1084                 $this->addSubtitle( self::buildBacklinkSubtitle( $title, $query ) );
1085         }
1086
1087         /**
1088          * Clear the subtitles
1089          */
1090         public function clearSubtitle() {
1091                 $this->mSubtitle = array();
1092         }
1093
1094         /**
1095          * Get the subtitle
1096          *
1097          * @return string
1098          */
1099         public function getSubtitle() {
1100                 return implode( "<br />\n\t\t\t\t", $this->mSubtitle );
1101         }
1102
1103         /**
1104          * Set the page as printable, i.e. it'll be displayed with all
1105          * print styles included
1106          */
1107         public function setPrintable() {
1108                 $this->mPrintable = true;
1109         }
1110
1111         /**
1112          * Return whether the page is "printable"
1113          *
1114          * @return bool
1115          */
1116         public function isPrintable() {
1117                 return $this->mPrintable;
1118         }
1119
1120         /**
1121          * Disable output completely, i.e. calling output() will have no effect
1122          */
1123         public function disable() {
1124                 $this->mDoNothing = true;
1125         }
1126
1127         /**
1128          * Return whether the output will be completely disabled
1129          *
1130          * @return bool
1131          */
1132         public function isDisabled() {
1133                 return $this->mDoNothing;
1134         }
1135
1136         /**
1137          * Show an "add new section" link?
1138          *
1139          * @return bool
1140          */
1141         public function showNewSectionLink() {
1142                 return $this->mNewSectionLink;
1143         }
1144
1145         /**
1146          * Forcibly hide the new section link?
1147          *
1148          * @return bool
1149          */
1150         public function forceHideNewSectionLink() {
1151                 return $this->mHideNewSectionLink;
1152         }
1153
1154         /**
1155          * Add or remove feed links in the page header
1156          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
1157          * for the new version
1158          * @see addFeedLink()
1159          *
1160          * @param bool $show True: add default feeds, false: remove all feeds
1161          */
1162         public function setSyndicated( $show = true ) {
1163                 if ( $show ) {
1164                         $this->setFeedAppendQuery( false );
1165                 } else {
1166                         $this->mFeedLinks = array();
1167                 }
1168         }
1169
1170         /**
1171          * Add default feeds to the page header
1172          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
1173          * for the new version
1174          * @see addFeedLink()
1175          *
1176          * @param string $val Query to append to feed links or false to output
1177          *        default links
1178          */
1179         public function setFeedAppendQuery( $val ) {
1180                 $this->mFeedLinks = array();
1181
1182                 foreach ( $this->getConfig()->get( 'AdvertisedFeedTypes' ) as $type ) {
1183                         $query = "feed=$type";
1184                         if ( is_string( $val ) ) {
1185                                 $query .= '&' . $val;
1186                         }
1187                         $this->mFeedLinks[$type] = $this->getTitle()->getLocalURL( $query );
1188                 }
1189         }
1190
1191         /**
1192          * Add a feed link to the page header
1193          *
1194          * @param string $format Feed type, should be a key of $wgFeedClasses
1195          * @param string $href URL
1196          */
1197         public function addFeedLink( $format, $href ) {
1198                 if ( in_array( $format, $this->getConfig()->get( 'AdvertisedFeedTypes' ) ) ) {
1199                         $this->mFeedLinks[$format] = $href;
1200                 }
1201         }
1202
1203         /**
1204          * Should we output feed links for this page?
1205          * @return bool
1206          */
1207         public function isSyndicated() {
1208                 return count( $this->mFeedLinks ) > 0;
1209         }
1210
1211         /**
1212          * Return URLs for each supported syndication format for this page.
1213          * @return array Associating format keys with URLs
1214          */
1215         public function getSyndicationLinks() {
1216                 return $this->mFeedLinks;
1217         }
1218
1219         /**
1220          * Will currently always return null
1221          *
1222          * @return null
1223          */
1224         public function getFeedAppendQuery() {
1225                 return $this->mFeedLinksAppendQuery;
1226         }
1227
1228         /**
1229          * Set whether the displayed content is related to the source of the
1230          * corresponding article on the wiki
1231          * Setting true will cause the change "article related" toggle to true
1232          *
1233          * @param bool $v
1234          */
1235         public function setArticleFlag( $v ) {
1236                 $this->mIsarticle = $v;
1237                 if ( $v ) {
1238                         $this->mIsArticleRelated = $v;
1239                 }
1240         }
1241
1242         /**
1243          * Return whether the content displayed page is related to the source of
1244          * the corresponding article on the wiki
1245          *
1246          * @return bool
1247          */
1248         public function isArticle() {
1249                 return $this->mIsarticle;
1250         }
1251
1252         /**
1253          * Set whether this page is related an article on the wiki
1254          * Setting false will cause the change of "article flag" toggle to false
1255          *
1256          * @param bool $v
1257          */
1258         public function setArticleRelated( $v ) {
1259                 $this->mIsArticleRelated = $v;
1260                 if ( !$v ) {
1261                         $this->mIsarticle = false;
1262                 }
1263         }
1264
1265         /**
1266          * Return whether this page is related an article on the wiki
1267          *
1268          * @return bool
1269          */
1270         public function isArticleRelated() {
1271                 return $this->mIsArticleRelated;
1272         }
1273
1274         /**
1275          * Add new language links
1276          *
1277          * @param array $newLinkArray Associative array mapping language code to the page
1278          *                      name
1279          */
1280         public function addLanguageLinks( array $newLinkArray ) {
1281                 $this->mLanguageLinks += $newLinkArray;
1282         }
1283
1284         /**
1285          * Reset the language links and add new language links
1286          *
1287          * @param array $newLinkArray Associative array mapping language code to the page
1288          *                      name
1289          */
1290         public function setLanguageLinks( array $newLinkArray ) {
1291                 $this->mLanguageLinks = $newLinkArray;
1292         }
1293
1294         /**
1295          * Get the list of language links
1296          *
1297          * @return array Array of Interwiki Prefixed (non DB key) Titles (e.g. 'fr:Test page')
1298          */
1299         public function getLanguageLinks() {
1300                 return $this->mLanguageLinks;
1301         }
1302
1303         /**
1304          * Add an array of categories, with names in the keys
1305          *
1306          * @param array $categories Mapping category name => sort key
1307          */
1308         public function addCategoryLinks( array $categories ) {
1309                 global $wgContLang;
1310
1311                 if ( !is_array( $categories ) || count( $categories ) == 0 ) {
1312                         return;
1313                 }
1314
1315                 # Add the links to a LinkBatch
1316                 $arr = array( NS_CATEGORY => $categories );
1317                 $lb = new LinkBatch;
1318                 $lb->setArray( $arr );
1319
1320                 # Fetch existence plus the hiddencat property
1321                 $dbr = wfGetDB( DB_SLAVE );
1322                 $fields = array( 'page_id', 'page_namespace', 'page_title', 'page_len',
1323                         'page_is_redirect', 'page_latest', 'pp_value' );
1324
1325                 if ( $this->getConfig()->get( 'ContentHandlerUseDB' ) ) {
1326                         $fields[] = 'page_content_model';
1327                 }
1328
1329                 $res = $dbr->select( array( 'page', 'page_props' ),
1330                         $fields,
1331                         $lb->constructSet( 'page', $dbr ),
1332                         __METHOD__,
1333                         array(),
1334                         array( 'page_props' => array( 'LEFT JOIN', array(
1335                                 'pp_propname' => 'hiddencat',
1336                                 'pp_page = page_id'
1337                         ) ) )
1338                 );
1339
1340                 # Add the results to the link cache
1341                 $lb->addResultToCache( LinkCache::singleton(), $res );
1342
1343                 # Set all the values to 'normal'.
1344                 $categories = array_fill_keys( array_keys( $categories ), 'normal' );
1345
1346                 # Mark hidden categories
1347                 foreach ( $res as $row ) {
1348                         if ( isset( $row->pp_value ) ) {
1349                                 $categories[$row->page_title] = 'hidden';
1350                         }
1351                 }
1352
1353                 # Add the remaining categories to the skin
1354                 if ( Hooks::run(
1355                         'OutputPageMakeCategoryLinks',
1356                         array( &$this, $categories, &$this->mCategoryLinks ) )
1357                 ) {
1358                         foreach ( $categories as $category => $type ) {
1359                                 $origcategory = $category;
1360                                 $title = Title::makeTitleSafe( NS_CATEGORY, $category );
1361                                 if ( !$title ) {
1362                                         continue;
1363                                 }
1364                                 $wgContLang->findVariantLink( $category, $title, true );
1365                                 if ( $category != $origcategory && array_key_exists( $category, $categories ) ) {
1366                                         continue;
1367                                 }
1368                                 $text = $wgContLang->convertHtml( $title->getText() );
1369                                 $this->mCategories[] = $title->getText();
1370                                 $this->mCategoryLinks[$type][] = Linker::link( $title, $text );
1371                         }
1372                 }
1373         }
1374
1375         /**
1376          * Reset the category links (but not the category list) and add $categories
1377          *
1378          * @param array $categories Mapping category name => sort key
1379          */
1380         public function setCategoryLinks( array $categories ) {
1381                 $this->mCategoryLinks = array();
1382                 $this->addCategoryLinks( $categories );
1383         }
1384
1385         /**
1386          * Get the list of category links, in a 2-D array with the following format:
1387          * $arr[$type][] = $link, where $type is either "normal" or "hidden" (for
1388          * hidden categories) and $link a HTML fragment with a link to the category
1389          * page
1390          *
1391          * @return array
1392          */
1393         public function getCategoryLinks() {
1394                 return $this->mCategoryLinks;
1395         }
1396
1397         /**
1398          * Get the list of category names this page belongs to
1399          *
1400          * @return array Array of strings
1401          */
1402         public function getCategories() {
1403                 return $this->mCategories;
1404         }
1405
1406         /**
1407          * Add an array of indicators, with their identifiers as array
1408          * keys and HTML contents as values.
1409          *
1410          * In case of duplicate keys, existing values are overwritten.
1411          *
1412          * @param array $indicators
1413          * @since 1.25
1414          */
1415         public function setIndicators( array $indicators ) {
1416                 $this->mIndicators = $indicators + $this->mIndicators;
1417                 // Keep ordered by key
1418                 ksort( $this->mIndicators );
1419         }
1420
1421         /**
1422          * Get the indicators associated with this page.
1423          *
1424          * The array will be internally ordered by item keys.
1425          *
1426          * @return array Keys: identifiers, values: HTML contents
1427          * @since 1.25
1428          */
1429         public function getIndicators() {
1430                 return $this->mIndicators;
1431         }
1432
1433         /**
1434          * Adds help link with an icon via page indicators.
1435          * Link target can be overridden by a local message containing a wikilink:
1436          * the message key is: lowercase action or special page name + '-helppage'.
1437          * @param string $to Target MediaWiki.org page title or encoded URL.
1438          * @param bool $overrideBaseUrl Whether $url is a full URL, to avoid MW.o.
1439          * @since 1.25
1440          */
1441         public function addHelpLink( $to, $overrideBaseUrl = false ) {
1442                 $this->addModuleStyles( 'mediawiki.helplink' );
1443                 $text = $this->msg( 'helppage-top-gethelp' )->escaped();
1444
1445                 if ( $overrideBaseUrl ) {
1446                         $helpUrl = $to;
1447                 } else {
1448                         $toUrlencoded = wfUrlencode( str_replace( ' ', '_', $to ) );
1449                         $helpUrl = "//www.mediawiki.org/wiki/Special:MyLanguage/$toUrlencoded";
1450                 }
1451
1452                 $link = Html::rawElement(
1453                         'a',
1454                         array(
1455                                 'href' => $helpUrl,
1456                                 'target' => '_blank',
1457                                 'class' => 'mw-helplink',
1458                         ),
1459                         $text
1460                 );
1461
1462                 $this->setIndicators( array( 'mw-helplink' => $link ) );
1463         }
1464
1465         /**
1466          * Do not allow scripts which can be modified by wiki users to load on this page;
1467          * only allow scripts bundled with, or generated by, the software.
1468          * Site-wide styles are controlled by a config setting, since they can be
1469          * used to create a custom skin/theme, but not user-specific ones.
1470          *
1471          * @todo this should be given a more accurate name
1472          */
1473         public function disallowUserJs() {
1474                 $this->reduceAllowedModules(
1475                         ResourceLoaderModule::TYPE_SCRIPTS,
1476                         ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL
1477                 );
1478
1479                 // Site-wide styles are controlled by a config setting, see bug 71621
1480                 // for background on why. User styles are never allowed.
1481                 if ( $this->getConfig()->get( 'AllowSiteCSSOnRestrictedPages' ) ) {
1482                         $styleOrigin = ResourceLoaderModule::ORIGIN_USER_SITEWIDE;
1483                 } else {
1484                         $styleOrigin = ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL;
1485                 }
1486                 $this->reduceAllowedModules(
1487                         ResourceLoaderModule::TYPE_STYLES,
1488                         $styleOrigin
1489                 );
1490         }
1491
1492         /**
1493          * Show what level of JavaScript / CSS untrustworthiness is allowed on this page
1494          * @see ResourceLoaderModule::$origin
1495          * @param string $type ResourceLoaderModule TYPE_ constant
1496          * @return int ResourceLoaderModule ORIGIN_ class constant
1497          */
1498         public function getAllowedModules( $type ) {
1499                 if ( $type == ResourceLoaderModule::TYPE_COMBINED ) {
1500                         return min( array_values( $this->mAllowedModules ) );
1501                 } else {
1502                         return isset( $this->mAllowedModules[$type] )
1503                                 ? $this->mAllowedModules[$type]
1504                                 : ResourceLoaderModule::ORIGIN_ALL;
1505                 }
1506         }
1507
1508         /**
1509          * Set the highest level of CSS/JS untrustworthiness allowed
1510          *
1511          * @deprecated since 1.24 Raising level of allowed untrusted content is no longer supported.
1512          *  Use reduceAllowedModules() instead
1513          * @param string $type ResourceLoaderModule TYPE_ constant
1514          * @param int $level ResourceLoaderModule class constant
1515          */
1516         public function setAllowedModules( $type, $level ) {
1517                 wfDeprecated( __METHOD__, '1.24' );
1518                 $this->reduceAllowedModules( $type, $level );
1519         }
1520
1521         /**
1522          * Limit the highest level of CSS/JS untrustworthiness allowed.
1523          *
1524          * If passed the same or a higher level than the current level of untrustworthiness set, the
1525          * level will remain unchanged.
1526          *
1527          * @param string $type
1528          * @param int $level ResourceLoaderModule class constant
1529          */
1530         public function reduceAllowedModules( $type, $level ) {
1531                 $this->mAllowedModules[$type] = min( $this->getAllowedModules( $type ), $level );
1532         }
1533
1534         /**
1535          * Prepend $text to the body HTML
1536          *
1537          * @param string $text HTML
1538          */
1539         public function prependHTML( $text ) {
1540                 $this->mBodytext = $text . $this->mBodytext;
1541         }
1542
1543         /**
1544          * Append $text to the body HTML
1545          *
1546          * @param string $text HTML
1547          */
1548         public function addHTML( $text ) {
1549                 $this->mBodytext .= $text;
1550         }
1551
1552         /**
1553          * Shortcut for adding an Html::element via addHTML.
1554          *
1555          * @since 1.19
1556          *
1557          * @param string $element
1558          * @param array $attribs
1559          * @param string $contents
1560          */
1561         public function addElement( $element, array $attribs = array(), $contents = '' ) {
1562                 $this->addHTML( Html::element( $element, $attribs, $contents ) );
1563         }
1564
1565         /**
1566          * Clear the body HTML
1567          */
1568         public function clearHTML() {
1569                 $this->mBodytext = '';
1570         }
1571
1572         /**
1573          * Get the body HTML
1574          *
1575          * @return string HTML
1576          */
1577         public function getHTML() {
1578                 return $this->mBodytext;
1579         }
1580
1581         /**
1582          * Get/set the ParserOptions object to use for wikitext parsing
1583          *
1584          * @param ParserOptions|null $options Either the ParserOption to use or null to only get the
1585          *   current ParserOption object
1586          * @return ParserOptions
1587          */
1588         public function parserOptions( $options = null ) {
1589                 if ( !$this->mParserOptions ) {
1590                         $this->mParserOptions = ParserOptions::newFromContext( $this->getContext() );
1591                         $this->mParserOptions->setEditSection( false );
1592                 }
1593                 return wfSetVar( $this->mParserOptions, $options );
1594         }
1595
1596         /**
1597          * Set the revision ID which will be seen by the wiki text parser
1598          * for things such as embedded {{REVISIONID}} variable use.
1599          *
1600          * @param int|null $revid An positive integer, or null
1601          * @return mixed Previous value
1602          */
1603         public function setRevisionId( $revid ) {
1604                 $val = is_null( $revid ) ? null : intval( $revid );
1605                 return wfSetVar( $this->mRevisionId, $val );
1606         }
1607
1608         /**
1609          * Get the displayed revision ID
1610          *
1611          * @return int
1612          */
1613         public function getRevisionId() {
1614                 return $this->mRevisionId;
1615         }
1616
1617         /**
1618          * Set the timestamp of the revision which will be displayed. This is used
1619          * to avoid a extra DB call in Skin::lastModified().
1620          *
1621          * @param string|null $timestamp
1622          * @return mixed Previous value
1623          */
1624         public function setRevisionTimestamp( $timestamp ) {
1625                 return wfSetVar( $this->mRevisionTimestamp, $timestamp );
1626         }
1627
1628         /**
1629          * Get the timestamp of displayed revision.
1630          * This will be null if not filled by setRevisionTimestamp().
1631          *
1632          * @return string|null
1633          */
1634         public function getRevisionTimestamp() {
1635                 return $this->mRevisionTimestamp;
1636         }
1637
1638         /**
1639          * Set the displayed file version
1640          *
1641          * @param File|bool $file
1642          * @return mixed Previous value
1643          */
1644         public function setFileVersion( $file ) {
1645                 $val = null;
1646                 if ( $file instanceof File && $file->exists() ) {
1647                         $val = array( 'time' => $file->getTimestamp(), 'sha1' => $file->getSha1() );
1648                 }
1649                 return wfSetVar( $this->mFileVersion, $val, true );
1650         }
1651
1652         /**
1653          * Get the displayed file version
1654          *
1655          * @return array|null ('time' => MW timestamp, 'sha1' => sha1)
1656          */
1657         public function getFileVersion() {
1658                 return $this->mFileVersion;
1659         }
1660
1661         /**
1662          * Get the templates used on this page
1663          *
1664          * @return array (namespace => dbKey => revId)
1665          * @since 1.18
1666          */
1667         public function getTemplateIds() {
1668                 return $this->mTemplateIds;
1669         }
1670
1671         /**
1672          * Get the files used on this page
1673          *
1674          * @return array (dbKey => array('time' => MW timestamp or null, 'sha1' => sha1 or ''))
1675          * @since 1.18
1676          */
1677         public function getFileSearchOptions() {
1678                 return $this->mImageTimeKeys;
1679         }
1680
1681         /**
1682          * Convert wikitext to HTML and add it to the buffer
1683          * Default assumes that the current page title will be used.
1684          *
1685          * @param string $text
1686          * @param bool $linestart Is this the start of a line?
1687          * @param bool $interface Is this text in the user interface language?
1688          * @throws MWException
1689          */
1690         public function addWikiText( $text, $linestart = true, $interface = true ) {
1691                 $title = $this->getTitle(); // Work around E_STRICT
1692                 if ( !$title ) {
1693                         throw new MWException( 'Title is null' );
1694                 }
1695                 $this->addWikiTextTitle( $text, $title, $linestart, /*tidy*/false, $interface );
1696         }
1697
1698         /**
1699          * Add wikitext with a custom Title object
1700          *
1701          * @param string $text Wikitext
1702          * @param Title $title
1703          * @param bool $linestart Is this the start of a line?
1704          */
1705         public function addWikiTextWithTitle( $text, &$title, $linestart = true ) {
1706                 $this->addWikiTextTitle( $text, $title, $linestart );
1707         }
1708
1709         /**
1710          * Add wikitext with a custom Title object and tidy enabled.
1711          *
1712          * @param string $text Wikitext
1713          * @param Title $title
1714          * @param bool $linestart Is this the start of a line?
1715          */
1716         function addWikiTextTitleTidy( $text, &$title, $linestart = true ) {
1717                 $this->addWikiTextTitle( $text, $title, $linestart, true );
1718         }
1719
1720         /**
1721          * Add wikitext with tidy enabled
1722          *
1723          * @param string $text Wikitext
1724          * @param bool $linestart Is this the start of a line?
1725          */
1726         public function addWikiTextTidy( $text, $linestart = true ) {
1727                 $title = $this->getTitle();
1728                 $this->addWikiTextTitleTidy( $text, $title, $linestart );
1729         }
1730
1731         /**
1732          * Add wikitext with a custom Title object
1733          *
1734          * @param string $text Wikitext
1735          * @param Title $title
1736          * @param bool $linestart Is this the start of a line?
1737          * @param bool $tidy Whether to use tidy
1738          * @param bool $interface Whether it is an interface message
1739          *   (for example disables conversion)
1740          */
1741         public function addWikiTextTitle( $text, Title $title, $linestart,
1742                 $tidy = false, $interface = false
1743         ) {
1744                 global $wgParser;
1745
1746                 $popts = $this->parserOptions();
1747                 $oldTidy = $popts->setTidy( $tidy );
1748                 $popts->setInterfaceMessage( (bool)$interface );
1749
1750                 $parserOutput = $wgParser->getFreshParser()->parse(
1751                         $text, $title, $popts,
1752                         $linestart, true, $this->mRevisionId
1753                 );
1754
1755                 $popts->setTidy( $oldTidy );
1756
1757                 $this->addParserOutput( $parserOutput );
1758
1759         }
1760
1761         /**
1762          * Add a ParserOutput object, but without Html.
1763          *
1764          * @deprecated since 1.24, use addParserOutputMetadata() instead.
1765          * @param ParserOutput $parserOutput
1766          */
1767         public function addParserOutputNoText( $parserOutput ) {
1768                 $this->addParserOutputMetadata( $parserOutput );
1769         }
1770
1771         /**
1772          * Add all metadata associated with a ParserOutput object, but without the actual HTML. This
1773          * includes categories, language links, ResourceLoader modules, effects of certain magic words,
1774          * and so on.
1775          *
1776          * @since 1.24
1777          * @param ParserOutput $parserOutput
1778          */
1779         public function addParserOutputMetadata( $parserOutput ) {
1780                 $this->mLanguageLinks += $parserOutput->getLanguageLinks();
1781                 $this->addCategoryLinks( $parserOutput->getCategories() );
1782                 $this->setIndicators( $parserOutput->getIndicators() );
1783                 $this->mNewSectionLink = $parserOutput->getNewSection();
1784                 $this->mHideNewSectionLink = $parserOutput->getHideNewSection();
1785
1786                 $this->mParseWarnings = $parserOutput->getWarnings();
1787                 if ( !$parserOutput->isCacheable() ) {
1788                         $this->enableClientCache( false );
1789                 }
1790                 $this->mNoGallery = $parserOutput->getNoGallery();
1791                 $this->mHeadItems = array_merge( $this->mHeadItems, $parserOutput->getHeadItems() );
1792                 $this->addModules( $parserOutput->getModules() );
1793                 $this->addModuleScripts( $parserOutput->getModuleScripts() );
1794                 $this->addModuleStyles( $parserOutput->getModuleStyles() );
1795                 $this->addJsConfigVars( $parserOutput->getJsConfigVars() );
1796                 $this->mPreventClickjacking = $this->mPreventClickjacking
1797                         || $parserOutput->preventClickjacking();
1798
1799                 // Template versioning...
1800                 foreach ( (array)$parserOutput->getTemplateIds() as $ns => $dbks ) {
1801                         if ( isset( $this->mTemplateIds[$ns] ) ) {
1802                                 $this->mTemplateIds[$ns] = $dbks + $this->mTemplateIds[$ns];
1803                         } else {
1804                                 $this->mTemplateIds[$ns] = $dbks;
1805                         }
1806                 }
1807                 // File versioning...
1808                 foreach ( (array)$parserOutput->getFileSearchOptions() as $dbk => $data ) {
1809                         $this->mImageTimeKeys[$dbk] = $data;
1810                 }
1811
1812                 // Hooks registered in the object
1813                 $parserOutputHooks = $this->getConfig()->get( 'ParserOutputHooks' );
1814                 foreach ( $parserOutput->getOutputHooks() as $hookInfo ) {
1815                         list( $hookName, $data ) = $hookInfo;
1816                         if ( isset( $parserOutputHooks[$hookName] ) ) {
1817                                 call_user_func( $parserOutputHooks[$hookName], $this, $parserOutput, $data );
1818                         }
1819                 }
1820
1821                 // Link flags are ignored for now, but may in the future be
1822                 // used to mark individual language links.
1823                 $linkFlags = array();
1824                 Hooks::run( 'LanguageLinks', array( $this->getTitle(), &$this->mLanguageLinks, &$linkFlags ) );
1825                 Hooks::run( 'OutputPageParserOutput', array( &$this, $parserOutput ) );
1826         }
1827
1828         /**
1829          * Add the HTML and enhancements for it (like ResourceLoader modules) associated with a
1830          * ParserOutput object, without any other metadata.
1831          *
1832          * @since 1.24
1833          * @param ParserOutput $parserOutput
1834          */
1835         public function addParserOutputContent( $parserOutput ) {
1836                 $this->addParserOutputText( $parserOutput );
1837
1838                 $this->addModules( $parserOutput->getModules() );
1839                 $this->addModuleScripts( $parserOutput->getModuleScripts() );
1840                 $this->addModuleStyles( $parserOutput->getModuleStyles() );
1841
1842                 $this->addJsConfigVars( $parserOutput->getJsConfigVars() );
1843         }
1844
1845         /**
1846          * Add the HTML associated with a ParserOutput object, without any metadata.
1847          *
1848          * @since 1.24
1849          * @param ParserOutput $parserOutput
1850          */
1851         public function addParserOutputText( $parserOutput ) {
1852                 $text = $parserOutput->getText();
1853                 Hooks::run( 'OutputPageBeforeHTML', array( &$this, &$text ) );
1854                 $this->addHTML( $text );
1855         }
1856
1857         /**
1858          * Add everything from a ParserOutput object.
1859          *
1860          * @param ParserOutput $parserOutput
1861          */
1862         function addParserOutput( $parserOutput ) {
1863                 $this->addParserOutputMetadata( $parserOutput );
1864                 $parserOutput->setTOCEnabled( $this->mEnableTOC );
1865
1866                 // Touch section edit links only if not previously disabled
1867                 if ( $parserOutput->getEditSectionTokens() ) {
1868                         $parserOutput->setEditSectionTokens( $this->mEnableSectionEditLinks );
1869                 }
1870
1871                 $this->addParserOutputText( $parserOutput );
1872         }
1873
1874         /**
1875          * Add the output of a QuickTemplate to the output buffer
1876          *
1877          * @param QuickTemplate $template
1878          */
1879         public function addTemplate( &$template ) {
1880                 $this->addHTML( $template->getHTML() );
1881         }
1882
1883         /**
1884          * Parse wikitext and return the HTML.
1885          *
1886          * @param string $text
1887          * @param bool $linestart Is this the start of a line?
1888          * @param bool $interface Use interface language ($wgLang instead of
1889          *   $wgContLang) while parsing language sensitive magic words like GRAMMAR and PLURAL.
1890          *   This also disables LanguageConverter.
1891          * @param Language $language Target language object, will override $interface
1892          * @throws MWException
1893          * @return string HTML
1894          */
1895         public function parse( $text, $linestart = true, $interface = false, $language = null ) {
1896                 global $wgParser;
1897
1898                 if ( is_null( $this->getTitle() ) ) {
1899                         throw new MWException( 'Empty $mTitle in ' . __METHOD__ );
1900                 }
1901
1902                 $popts = $this->parserOptions();
1903                 if ( $interface ) {
1904                         $popts->setInterfaceMessage( true );
1905                 }
1906                 if ( $language !== null ) {
1907                         $oldLang = $popts->setTargetLanguage( $language );
1908                 }
1909
1910                 $parserOutput = $wgParser->getFreshParser()->parse(
1911                         $text, $this->getTitle(), $popts,
1912                         $linestart, true, $this->mRevisionId
1913                 );
1914
1915                 if ( $interface ) {
1916                         $popts->setInterfaceMessage( false );
1917                 }
1918                 if ( $language !== null ) {
1919                         $popts->setTargetLanguage( $oldLang );
1920                 }
1921
1922                 return $parserOutput->getText();
1923         }
1924
1925         /**
1926          * Parse wikitext, strip paragraphs, and return the HTML.
1927          *
1928          * @param string $text
1929          * @param bool $linestart Is this the start of a line?
1930          * @param bool $interface Use interface language ($wgLang instead of
1931          *   $wgContLang) while parsing language sensitive magic
1932          *   words like GRAMMAR and PLURAL
1933          * @return string HTML
1934          */
1935         public function parseInline( $text, $linestart = true, $interface = false ) {
1936                 $parsed = $this->parse( $text, $linestart, $interface );
1937                 return Parser::stripOuterParagraph( $parsed );
1938         }
1939
1940         /**
1941          * Set the value of the "s-maxage" part of the "Cache-control" HTTP header
1942          *
1943          * @param int $maxage Maximum cache time on the Squid, in seconds.
1944          */
1945         public function setSquidMaxage( $maxage ) {
1946                 $this->mSquidMaxage = $maxage;
1947         }
1948
1949         /**
1950          * Use enableClientCache(false) to force it to send nocache headers
1951          *
1952          * @param bool $state
1953          *
1954          * @return bool
1955          */
1956         public function enableClientCache( $state ) {
1957                 return wfSetVar( $this->mEnableClientCache, $state );
1958         }
1959
1960         /**
1961          * Get the list of cookies that will influence on the cache
1962          *
1963          * @return array
1964          */
1965         function getCacheVaryCookies() {
1966                 static $cookies;
1967                 if ( $cookies === null ) {
1968                         $config = $this->getConfig();
1969                         $cookies = array_merge(
1970                                 array(
1971                                         $config->get( 'CookiePrefix' ) . 'Token',
1972                                         $config->get( 'CookiePrefix' ) . 'LoggedOut',
1973                                         "forceHTTPS",
1974                                         session_name()
1975                                 ),
1976                                 $config->get( 'CacheVaryCookies' )
1977                         );
1978                         Hooks::run( 'GetCacheVaryCookies', array( $this, &$cookies ) );
1979                 }
1980                 return $cookies;
1981         }
1982
1983         /**
1984          * Check if the request has a cache-varying cookie header
1985          * If it does, it's very important that we don't allow public caching
1986          *
1987          * @return bool
1988          */
1989         function haveCacheVaryCookies() {
1990                 $cookieHeader = $this->getRequest()->getHeader( 'cookie' );
1991                 if ( $cookieHeader === false ) {
1992                         return false;
1993                 }
1994                 $cvCookies = $this->getCacheVaryCookies();
1995                 foreach ( $cvCookies as $cookieName ) {
1996                         # Check for a simple string match, like the way squid does it
1997                         if ( strpos( $cookieHeader, $cookieName ) !== false ) {
1998                                 wfDebug( __METHOD__ . ": found $cookieName\n" );
1999                                 return true;
2000                         }
2001                 }
2002                 wfDebug( __METHOD__ . ": no cache-varying cookies found\n" );
2003                 return false;
2004         }
2005
2006         /**
2007          * Add an HTTP header that will influence on the cache
2008          *
2009          * @param string $header Header name
2010          * @param array|null $option
2011          * @todo FIXME: Document the $option parameter; it appears to be for
2012          *        X-Vary-Options but what format is acceptable?
2013          */
2014         public function addVaryHeader( $header, $option = null ) {
2015                 if ( !array_key_exists( $header, $this->mVaryHeader ) ) {
2016                         $this->mVaryHeader[$header] = (array)$option;
2017                 } elseif ( is_array( $option ) ) {
2018                         if ( is_array( $this->mVaryHeader[$header] ) ) {
2019                                 $this->mVaryHeader[$header] = array_merge( $this->mVaryHeader[$header], $option );
2020                         } else {
2021                                 $this->mVaryHeader[$header] = $option;
2022                         }
2023                 }
2024                 $this->mVaryHeader[$header] = array_unique( (array)$this->mVaryHeader[$header] );
2025         }
2026
2027         /**
2028          * Return a Vary: header on which to vary caches. Based on the keys of $mVaryHeader,
2029          * such as Accept-Encoding or Cookie
2030          *
2031          * @return string
2032          */
2033         public function getVaryHeader() {
2034                 return 'Vary: ' . join( ', ', array_keys( $this->mVaryHeader ) );
2035         }
2036
2037         /**
2038          * Get a complete X-Vary-Options header
2039          *
2040          * @return string
2041          */
2042         public function getXVO() {
2043                 $cvCookies = $this->getCacheVaryCookies();
2044
2045                 $cookiesOption = array();
2046                 foreach ( $cvCookies as $cookieName ) {
2047                         $cookiesOption[] = 'string-contains=' . $cookieName;
2048                 }
2049                 $this->addVaryHeader( 'Cookie', $cookiesOption );
2050
2051                 $headers = array();
2052                 foreach ( $this->mVaryHeader as $header => $option ) {
2053                         $newheader = $header;
2054                         if ( is_array( $option ) && count( $option ) > 0 ) {
2055                                 $newheader .= ';' . implode( ';', $option );
2056                         }
2057                         $headers[] = $newheader;
2058                 }
2059                 $xvo = 'X-Vary-Options: ' . implode( ',', $headers );
2060
2061                 return $xvo;
2062         }
2063
2064         /**
2065          * bug 21672: Add Accept-Language to Vary and XVO headers
2066          * if there's no 'variant' parameter existed in GET.
2067          *
2068          * For example:
2069          *   /w/index.php?title=Main_page should always be served; but
2070          *   /w/index.php?title=Main_page&variant=zh-cn should never be served.
2071          */
2072         function addAcceptLanguage() {
2073                 $title = $this->getTitle();
2074                 if ( !$title instanceof Title ) {
2075                         return;
2076                 }
2077
2078                 $lang = $title->getPageLanguage();
2079                 if ( !$this->getRequest()->getCheck( 'variant' ) && $lang->hasVariants() ) {
2080                         $variants = $lang->getVariants();
2081                         $aloption = array();
2082                         foreach ( $variants as $variant ) {
2083                                 if ( $variant === $lang->getCode() ) {
2084                                         continue;
2085                                 } else {
2086                                         $aloption[] = 'string-contains=' . $variant;
2087
2088                                         // IE and some other browsers use BCP 47 standards in
2089                                         // their Accept-Language header, like "zh-CN" or "zh-Hant".
2090                                         // We should handle these too.
2091                                         $variantBCP47 = wfBCP47( $variant );
2092                                         if ( $variantBCP47 !== $variant ) {
2093                                                 $aloption[] = 'string-contains=' . $variantBCP47;
2094                                         }
2095                                 }
2096                         }
2097                         $this->addVaryHeader( 'Accept-Language', $aloption );
2098                 }
2099         }
2100
2101         /**
2102          * Set a flag which will cause an X-Frame-Options header appropriate for
2103          * edit pages to be sent. The header value is controlled by
2104          * $wgEditPageFrameOptions.
2105          *
2106          * This is the default for special pages. If you display a CSRF-protected
2107          * form on an ordinary view page, then you need to call this function.
2108          *
2109          * @param bool $enable
2110          */
2111         public function preventClickjacking( $enable = true ) {
2112                 $this->mPreventClickjacking = $enable;
2113         }
2114
2115         /**
2116          * Turn off frame-breaking. Alias for $this->preventClickjacking(false).
2117          * This can be called from pages which do not contain any CSRF-protected
2118          * HTML form.
2119          */
2120         public function allowClickjacking() {
2121                 $this->mPreventClickjacking = false;
2122         }
2123
2124         /**
2125          * Get the prevent-clickjacking flag
2126          *
2127          * @since 1.24
2128          * @return bool
2129          */
2130         public function getPreventClickjacking() {
2131                 return $this->mPreventClickjacking;
2132         }
2133
2134         /**
2135          * Get the X-Frame-Options header value (without the name part), or false
2136          * if there isn't one. This is used by Skin to determine whether to enable
2137          * JavaScript frame-breaking, for clients that don't support X-Frame-Options.
2138          *
2139          * @return string
2140          */
2141         public function getFrameOptions() {
2142                 $config = $this->getConfig();
2143                 if ( $config->get( 'BreakFrames' ) ) {
2144                         return 'DENY';
2145                 } elseif ( $this->mPreventClickjacking && $config->get( 'EditPageFrameOptions' ) ) {
2146                         return $config->get( 'EditPageFrameOptions' );
2147                 }
2148                 return false;
2149         }
2150
2151         /**
2152          * Send cache control HTTP headers
2153          */
2154         public function sendCacheControl() {
2155                 $response = $this->getRequest()->response();
2156                 $config = $this->getConfig();
2157                 if ( $config->get( 'UseETag' ) && $this->mETag ) {
2158                         $response->header( "ETag: $this->mETag" );
2159                 }
2160
2161                 $this->addVaryHeader( 'Cookie' );
2162                 $this->addAcceptLanguage();
2163
2164                 # don't serve compressed data to clients who can't handle it
2165                 # maintain different caches for logged-in users and non-logged in ones
2166                 $response->header( $this->getVaryHeader() );
2167
2168                 if ( $config->get( 'UseXVO' ) ) {
2169                         # Add an X-Vary-Options header for Squid with Wikimedia patches
2170                         $response->header( $this->getXVO() );
2171                 }
2172
2173                 if ( $this->mEnableClientCache ) {
2174                         if (
2175                                 $config->get( 'UseSquid' ) && session_id() == '' && !$this->isPrintable() &&
2176                                 $this->mSquidMaxage != 0 && !$this->haveCacheVaryCookies()
2177                         ) {
2178                                 if ( $config->get( 'UseESI' ) ) {
2179                                         # We'll purge the proxy cache explicitly, but require end user agents
2180                                         # to revalidate against the proxy on each visit.
2181                                         # Surrogate-Control controls our Squid, Cache-Control downstream caches
2182                                         wfDebug( __METHOD__ . ": proxy caching with ESI; {$this->mLastModified} **\n", 'log' );
2183                                         # start with a shorter timeout for initial testing
2184                                         # header( 'Surrogate-Control: max-age=2678400+2678400, content="ESI/1.0"');
2185                                         $response->header( 'Surrogate-Control: max-age=' . $config->get( 'SquidMaxage' )
2186                                                 . '+' . $this->mSquidMaxage . ', content="ESI/1.0"' );
2187                                         $response->header( 'Cache-Control: s-maxage=0, must-revalidate, max-age=0' );
2188                                 } else {
2189                                         # We'll purge the proxy cache for anons explicitly, but require end user agents
2190                                         # to revalidate against the proxy on each visit.
2191                                         # IMPORTANT! The Squid needs to replace the Cache-Control header with
2192                                         # Cache-Control: s-maxage=0, must-revalidate, max-age=0
2193                                         wfDebug( __METHOD__ . ": local proxy caching; {$this->mLastModified} **\n", 'log' );
2194                                         # start with a shorter timeout for initial testing
2195                                         # header( "Cache-Control: s-maxage=2678400, must-revalidate, max-age=0" );
2196                                         $response->header( 'Cache-Control: s-maxage=' . $this->mSquidMaxage
2197                                                 . ', must-revalidate, max-age=0' );
2198                                 }
2199                         } else {
2200                                 # We do want clients to cache if they can, but they *must* check for updates
2201                                 # on revisiting the page.
2202                                 wfDebug( __METHOD__ . ": private caching; {$this->mLastModified} **\n", 'log' );
2203                                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
2204                                 $response->header( "Cache-Control: private, must-revalidate, max-age=0" );
2205                         }
2206                         if ( $this->mLastModified ) {
2207                                 $response->header( "Last-Modified: {$this->mLastModified}" );
2208                         }
2209                 } else {
2210                         wfDebug( __METHOD__ . ": no caching **\n", 'log' );
2211
2212                         # In general, the absence of a last modified header should be enough to prevent
2213                         # the client from using its cache. We send a few other things just to make sure.
2214                         $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
2215                         $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
2216                         $response->header( 'Pragma: no-cache' );
2217                 }
2218         }
2219
2220         /**
2221          * Finally, all the text has been munged and accumulated into
2222          * the object, let's actually output it:
2223          */
2224         public function output() {
2225                 if ( $this->mDoNothing ) {
2226                         return;
2227                 }
2228
2229                 $response = $this->getRequest()->response();
2230                 $config = $this->getConfig();
2231
2232                 if ( $this->mRedirect != '' ) {
2233                         # Standards require redirect URLs to be absolute
2234                         $this->mRedirect = wfExpandUrl( $this->mRedirect, PROTO_CURRENT );
2235
2236                         $redirect = $this->mRedirect;
2237                         $code = $this->mRedirectCode;
2238
2239                         if ( Hooks::run( "BeforePageRedirect", array( $this, &$redirect, &$code ) ) ) {
2240                                 if ( $code == '301' || $code == '303' ) {
2241                                         if ( !$config->get( 'DebugRedirects' ) ) {
2242                                                 $response->statusHeader( $code );
2243                                         }
2244                                         $this->mLastModified = wfTimestamp( TS_RFC2822 );
2245                                 }
2246                                 if ( $config->get( 'VaryOnXFP' ) ) {
2247                                         $this->addVaryHeader( 'X-Forwarded-Proto' );
2248                                 }
2249                                 $this->sendCacheControl();
2250
2251                                 $response->header( "Content-Type: text/html; charset=utf-8" );
2252                                 if ( $config->get( 'DebugRedirects' ) ) {
2253                                         $url = htmlspecialchars( $redirect );
2254                                         print "<html>\n<head>\n<title>Redirect</title>\n</head>\n<body>\n";
2255                                         print "<p>Location: <a href=\"$url\">$url</a></p>\n";
2256                                         print "</body>\n</html>\n";
2257                                 } else {
2258                                         $response->header( 'Location: ' . $redirect );
2259                                 }
2260                         }
2261
2262                         return;
2263                 } elseif ( $this->mStatusCode ) {
2264                         $response->statusHeader( $this->mStatusCode );
2265                 }
2266
2267                 # Buffer output; final headers may depend on later processing
2268                 ob_start();
2269
2270                 $response->header( 'Content-type: ' . $config->get( 'MimeType' ) . '; charset=UTF-8' );
2271                 $response->header( 'Content-language: ' . $config->get( 'LanguageCode' ) );
2272
2273                 // Avoid Internet Explorer "compatibility view" in IE 8-10, so that
2274                 // jQuery etc. can work correctly.
2275                 $response->header( 'X-UA-Compatible: IE=Edge' );
2276
2277                 // Prevent framing, if requested
2278                 $frameOptions = $this->getFrameOptions();
2279                 if ( $frameOptions ) {
2280                         $response->header( "X-Frame-Options: $frameOptions" );
2281                 }
2282
2283                 if ( $this->mArticleBodyOnly ) {
2284                         echo $this->mBodytext;
2285                 } else {
2286                         $sk = $this->getSkin();
2287                         // add skin specific modules
2288                         $modules = $sk->getDefaultModules();
2289
2290                         // Enforce various default modules for all skins
2291                         $coreModules = array(
2292                                 // Keep this list as small as possible
2293                                 'site',
2294                                 'mediawiki.page.startup',
2295                                 'mediawiki.user',
2296                         );
2297
2298                         // Support for high-density display images if enabled
2299                         if ( $config->get( 'ResponsiveImages' ) ) {
2300                                 $coreModules[] = 'mediawiki.hidpi';
2301                         }
2302
2303                         $this->addModules( $coreModules );
2304                         foreach ( $modules as $group ) {
2305                                 $this->addModules( $group );
2306                         }
2307                         MWDebug::addModules( $this );
2308
2309                         // Hook that allows last minute changes to the output page, e.g.
2310                         // adding of CSS or Javascript by extensions.
2311                         Hooks::run( 'BeforePageDisplay', array( &$this, &$sk ) );
2312
2313                         $sk->outputPage();
2314                 }
2315
2316                 // This hook allows last minute changes to final overall output by modifying output buffer
2317                 Hooks::run( 'AfterFinalPageOutput', array( $this ) );
2318
2319                 $this->sendCacheControl();
2320
2321                 ob_end_flush();
2322
2323         }
2324
2325         /**
2326          * Actually output something with print.
2327          *
2328          * @param string $ins The string to output
2329          * @deprecated since 1.22 Use echo yourself.
2330          */
2331         public function out( $ins ) {
2332                 wfDeprecated( __METHOD__, '1.22' );
2333                 print $ins;
2334         }
2335
2336         /**
2337          * Produce a "user is blocked" page.
2338          * @deprecated since 1.18
2339          */
2340         function blockedPage() {
2341                 throw new UserBlockedError( $this->getUser()->mBlock );
2342         }
2343
2344         /**
2345          * Prepare this object to display an error page; disable caching and
2346          * indexing, clear the current text and redirect, set the page's title
2347          * and optionally an custom HTML title (content of the "<title>" tag).
2348          *
2349          * @param string|Message $pageTitle Will be passed directly to setPageTitle()
2350          * @param string|Message $htmlTitle Will be passed directly to setHTMLTitle();
2351          *                   optional, if not passed the "<title>" attribute will be
2352          *                   based on $pageTitle
2353          */
2354         public function prepareErrorPage( $pageTitle, $htmlTitle = false ) {
2355                 $this->setPageTitle( $pageTitle );
2356                 if ( $htmlTitle !== false ) {
2357                         $this->setHTMLTitle( $htmlTitle );
2358                 }
2359                 $this->setRobotPolicy( 'noindex,nofollow' );
2360                 $this->setArticleRelated( false );
2361                 $this->enableClientCache( false );
2362                 $this->mRedirect = '';
2363                 $this->clearSubtitle();
2364                 $this->clearHTML();
2365         }
2366
2367         /**
2368          * Output a standard error page
2369          *
2370          * showErrorPage( 'titlemsg', 'pagetextmsg' );
2371          * showErrorPage( 'titlemsg', 'pagetextmsg', array( 'param1', 'param2' ) );
2372          * showErrorPage( 'titlemsg', $messageObject );
2373          * showErrorPage( $titleMessageObject, $messageObject );
2374          *
2375          * @param string|Message $title Message key (string) for page title, or a Message object
2376          * @param string|Message $msg Message key (string) for page text, or a Message object
2377          * @param array $params Message parameters; ignored if $msg is a Message object
2378          */
2379         public function showErrorPage( $title, $msg, $params = array() ) {
2380                 if ( !$title instanceof Message ) {
2381                         $title = $this->msg( $title );
2382                 }
2383
2384                 $this->prepareErrorPage( $title );
2385
2386                 if ( $msg instanceof Message ) {
2387                         if ( $params !== array() ) {
2388                                 trigger_error( 'Argument ignored: $params. The message parameters argument '
2389                                         . 'is discarded when the $msg argument is a Message object instead of '
2390                                         . 'a string.', E_USER_NOTICE );
2391                         }
2392                         $this->addHTML( $msg->parseAsBlock() );
2393                 } else {
2394                         $this->addWikiMsgArray( $msg, $params );
2395                 }
2396
2397                 $this->returnToMain();
2398         }
2399
2400         /**
2401          * Output a standard permission error page
2402          *
2403          * @param array $errors Error message keys
2404          * @param string $action Action that was denied or null if unknown
2405          */
2406         public function showPermissionsErrorPage( array $errors, $action = null ) {
2407                 // For some action (read, edit, create and upload), display a "login to do this action"
2408                 // error if all of the following conditions are met:
2409                 // 1. the user is not logged in
2410                 // 2. the only error is insufficient permissions (i.e. no block or something else)
2411                 // 3. the error can be avoided simply by logging in
2412                 if ( in_array( $action, array( 'read', 'edit', 'createpage', 'createtalk', 'upload' ) )
2413                         && $this->getUser()->isAnon() && count( $errors ) == 1 && isset( $errors[0][0] )
2414                         && ( $errors[0][0] == 'badaccess-groups' || $errors[0][0] == 'badaccess-group0' )
2415                         && ( User::groupHasPermission( 'user', $action )
2416                         || User::groupHasPermission( 'autoconfirmed', $action ) )
2417                 ) {
2418                         $displayReturnto = null;
2419
2420                         # Due to bug 32276, if a user does not have read permissions,
2421                         # $this->getTitle() will just give Special:Badtitle, which is
2422                         # not especially useful as a returnto parameter. Use the title
2423                         # from the request instead, if there was one.
2424                         $request = $this->getRequest();
2425                         $returnto = Title::newFromURL( $request->getVal( 'title', '' ) );
2426                         if ( $action == 'edit' ) {
2427                                 $msg = 'whitelistedittext';
2428                                 $displayReturnto = $returnto;
2429                         } elseif ( $action == 'createpage' || $action == 'createtalk' ) {
2430                                 $msg = 'nocreatetext';
2431                         } elseif ( $action == 'upload' ) {
2432                                 $msg = 'uploadnologintext';
2433                         } else { # Read
2434                                 $msg = 'loginreqpagetext';
2435                                 $displayReturnto = Title::newMainPage();
2436                         }
2437
2438                         $query = array();
2439
2440                         if ( $returnto ) {
2441                                 $query['returnto'] = $returnto->getPrefixedText();
2442
2443                                 if ( !$request->wasPosted() ) {
2444                                         $returntoquery = $request->getValues();
2445                                         unset( $returntoquery['title'] );
2446                                         unset( $returntoquery['returnto'] );
2447                                         unset( $returntoquery['returntoquery'] );
2448                                         $query['returntoquery'] = wfArrayToCgi( $returntoquery );
2449                                 }
2450                         }
2451                         $loginLink = Linker::linkKnown(
2452                                 SpecialPage::getTitleFor( 'Userlogin' ),
2453                                 $this->msg( 'loginreqlink' )->escaped(),
2454                                 array(),
2455                                 $query
2456                         );
2457
2458                         $this->prepareErrorPage( $this->msg( 'loginreqtitle' ) );
2459                         $this->addHTML( $this->msg( $msg )->rawParams( $loginLink )->parse() );
2460
2461                         # Don't return to a page the user can't read otherwise
2462                         # we'll end up in a pointless loop
2463                         if ( $displayReturnto && $displayReturnto->userCan( 'read', $this->getUser() ) ) {
2464                                 $this->returnToMain( null, $displayReturnto );
2465                         }
2466                 } else {
2467                         $this->prepareErrorPage( $this->msg( 'permissionserrors' ) );
2468                         $this->addWikiText( $this->formatPermissionsErrorMessage( $errors, $action ) );
2469                 }
2470         }
2471
2472         /**
2473          * Display an error page indicating that a given version of MediaWiki is
2474          * required to use it
2475          *
2476          * @param mixed $version The version of MediaWiki needed to use the page
2477          */
2478         public function versionRequired( $version ) {
2479                 $this->prepareErrorPage( $this->msg( 'versionrequired', $version ) );
2480
2481                 $this->addWikiMsg( 'versionrequiredtext', $version );
2482                 $this->returnToMain();
2483         }
2484
2485         /**
2486          * Display an error page noting that a given permission bit is required.
2487          * @deprecated since 1.18, just throw the exception directly
2488          * @param string $permission Key required
2489          * @throws PermissionsError
2490          */
2491         public function permissionRequired( $permission ) {
2492                 throw new PermissionsError( $permission );
2493         }
2494
2495         /**
2496          * Produce the stock "please login to use the wiki" page
2497          *
2498          * @deprecated since 1.19; throw the exception directly
2499          */
2500         public function loginToUse() {
2501                 throw new PermissionsError( 'read' );
2502         }
2503
2504         /**
2505          * Format a list of error messages
2506          *
2507          * @param array $errors Array of arrays returned by Title::getUserPermissionsErrors
2508          * @param string $action Action that was denied or null if unknown
2509          * @return string The wikitext error-messages, formatted into a list.
2510          */
2511         public function formatPermissionsErrorMessage( array $errors, $action = null ) {
2512                 if ( $action == null ) {
2513                         $text = $this->msg( 'permissionserrorstext', count( $errors ) )->plain() . "\n\n";
2514                 } else {
2515                         $action_desc = $this->msg( "action-$action" )->plain();
2516                         $text = $this->msg(
2517                                 'permissionserrorstext-withaction',
2518                                 count( $errors ),
2519                                 $action_desc
2520                         )->plain() . "\n\n";
2521                 }
2522
2523                 if ( count( $errors ) > 1 ) {
2524                         $text .= '<ul class="permissions-errors">' . "\n";
2525
2526                         foreach ( $errors as $error ) {
2527                                 $text .= '<li>';
2528                                 $text .= call_user_func_array( array( $this, 'msg' ), $error )->plain();
2529                                 $text .= "</li>\n";
2530                         }
2531                         $text .= '</ul>';
2532                 } else {
2533                         $text .= "<div class=\"permissions-errors\">\n" .
2534                                         call_user_func_array( array( $this, 'msg' ), reset( $errors ) )->plain() .
2535                                         "\n</div>";
2536                 }
2537
2538                 return $text;
2539         }
2540
2541         /**
2542          * Display a page stating that the Wiki is in read-only mode.
2543          * Should only be called after wfReadOnly() has returned true.
2544          *
2545          * Historically, this function was used to show the source of the page that the user
2546          * was trying to edit and _also_ permissions error messages. The relevant code was
2547          * moved into EditPage in 1.19 (r102024 / d83c2a431c2a) and removed here in 1.25.
2548          *
2549          * @deprecated since 1.25; throw the exception directly
2550          * @throws ReadOnlyError
2551          */
2552         public function readOnlyPage() {
2553                 if ( func_num_args() > 0 ) {
2554                         throw new MWException( __METHOD__ . ' no longer accepts arguments since 1.25.' );
2555                 }
2556
2557                 throw new ReadOnlyError;
2558         }
2559
2560         /**
2561          * Turn off regular page output and return an error response
2562          * for when rate limiting has triggered.
2563          *
2564          * @deprecated since 1.25; throw the exception directly
2565          */
2566         public function rateLimited() {
2567                 wfDeprecated( __METHOD__, '1.25' );
2568                 throw new ThrottledError;
2569         }
2570
2571         /**
2572          * Show a warning about slave lag
2573          *
2574          * If the lag is higher than $wgSlaveLagCritical seconds,
2575          * then the warning is a bit more obvious. If the lag is
2576          * lower than $wgSlaveLagWarning, then no warning is shown.
2577          *
2578          * @param int $lag Slave lag
2579          */
2580         public function showLagWarning( $lag ) {
2581                 $config = $this->getConfig();
2582                 if ( $lag >= $config->get( 'SlaveLagWarning' ) ) {
2583                         $message = $lag < $config->get( 'SlaveLagCritical' )
2584                                 ? 'lag-warn-normal'
2585                                 : 'lag-warn-high';
2586                         $wrap = Html::rawElement( 'div', array( 'class' => "mw-{$message}" ), "\n$1\n" );
2587                         $this->wrapWikiMsg( "$wrap\n", array( $message, $this->getLanguage()->formatNum( $lag ) ) );
2588                 }
2589         }
2590
2591         public function showFatalError( $message ) {
2592                 $this->prepareErrorPage( $this->msg( 'internalerror' ) );
2593
2594                 $this->addHTML( $message );
2595         }
2596
2597         public function showUnexpectedValueError( $name, $val ) {
2598                 $this->showFatalError( $this->msg( 'unexpected', $name, $val )->text() );
2599         }
2600
2601         public function showFileCopyError( $old, $new ) {
2602                 $this->showFatalError( $this->msg( 'filecopyerror', $old, $new )->text() );
2603         }
2604
2605         public function showFileRenameError( $old, $new ) {
2606                 $this->showFatalError( $this->msg( 'filerenameerror', $old, $new )->text() );
2607         }
2608
2609         public function showFileDeleteError( $name ) {
2610                 $this->showFatalError( $this->msg( 'filedeleteerror', $name )->text() );
2611         }
2612
2613         public function showFileNotFoundError( $name ) {
2614                 $this->showFatalError( $this->msg( 'filenotfound', $name )->text() );
2615         }
2616
2617         /**
2618          * Add a "return to" link pointing to a specified title
2619          *
2620          * @param Title $title Title to link
2621          * @param array $query Query string parameters
2622          * @param string $text Text of the link (input is not escaped)
2623          * @param array $options Options array to pass to Linker
2624          */
2625         public function addReturnTo( $title, array $query = array(), $text = null, $options = array() ) {
2626                 $link = $this->msg( 'returnto' )->rawParams(
2627                         Linker::link( $title, $text, array(), $query, $options ) )->escaped();
2628                 $this->addHTML( "<p id=\"mw-returnto\">{$link}</p>\n" );
2629         }
2630
2631         /**
2632          * Add a "return to" link pointing to a specified title,
2633          * or the title indicated in the request, or else the main page
2634          *
2635          * @param mixed $unused
2636          * @param Title|string $returnto Title or String to return to
2637          * @param string $returntoquery Query string for the return to link
2638          */
2639         public function returnToMain( $unused = null, $returnto = null, $returntoquery = null ) {
2640                 if ( $returnto == null ) {
2641                         $returnto = $this->getRequest()->getText( 'returnto' );
2642                 }
2643
2644                 if ( $returntoquery == null ) {
2645                         $returntoquery = $this->getRequest()->getText( 'returntoquery' );
2646                 }
2647
2648                 if ( $returnto === '' ) {
2649                         $returnto = Title::newMainPage();
2650                 }
2651
2652                 if ( is_object( $returnto ) ) {
2653                         $titleObj = $returnto;
2654                 } else {
2655                         $titleObj = Title::newFromText( $returnto );
2656                 }
2657                 if ( !is_object( $titleObj ) ) {
2658                         $titleObj = Title::newMainPage();
2659                 }
2660
2661                 $this->addReturnTo( $titleObj, wfCgiToArray( $returntoquery ) );
2662         }
2663
2664         /**
2665          * @param Skin $sk The given Skin
2666          * @param bool $includeStyle Unused
2667          * @return string The doctype, opening "<html>", and head element.
2668          */
2669         public function headElement( Skin $sk, $includeStyle = true ) {
2670                 global $wgContLang;
2671
2672                 $userdir = $this->getLanguage()->getDir();
2673                 $sitedir = $wgContLang->getDir();
2674
2675                 $ret = Html::htmlHeader( $sk->getHtmlElementAttributes() );
2676
2677                 if ( $this->getHTMLTitle() == '' ) {
2678                         $this->setHTMLTitle( $this->msg( 'pagetitle', $this->getPageTitle() )->inContentLanguage() );
2679                 }
2680
2681                 $openHead = Html::openElement( 'head' );
2682                 if ( $openHead ) {
2683                         # Don't bother with the newline if $head == ''
2684                         $ret .= "$openHead\n";
2685                 }
2686
2687                 if ( !Html::isXmlMimeType( $this->getConfig()->get( 'MimeType' ) ) ) {
2688                         // Add <meta charset="UTF-8">
2689                         // This should be before <title> since it defines the charset used by
2690                         // text including the text inside <title>.
2691                         // The spec recommends defining XHTML5's charset using the XML declaration
2692                         // instead of meta.
2693                         // Our XML declaration is output by Html::htmlHeader.
2694                         // http://www.whatwg.org/html/semantics.html#attr-meta-http-equiv-content-type
2695                         // http://www.whatwg.org/html/semantics.html#charset
2696                         $ret .= Html::element( 'meta', array( 'charset' => 'UTF-8' ) ) . "\n";
2697                 }
2698
2699                 $ret .= Html::element( 'title', null, $this->getHTMLTitle() ) . "\n";
2700
2701                 foreach ( $this->getHeadLinksArray() as $item ) {
2702                         $ret .= $item . "\n";
2703                 }
2704
2705                 $ret .= $this->buildCssLinks() . "\n";
2706
2707                 $ret .= $this->getHeadScripts() . "\n";
2708
2709                 foreach ( $this->mHeadItems as $item ) {
2710                         $ret .= $item . "\n";
2711                 }
2712
2713                 $closeHead = Html::closeElement( 'head' );
2714                 if ( $closeHead ) {
2715                         $ret .= "$closeHead\n";
2716                 }
2717
2718                 $bodyClasses = array();
2719                 $bodyClasses[] = 'mediawiki';
2720
2721                 # Classes for LTR/RTL directionality support
2722                 $bodyClasses[] = $userdir;
2723                 $bodyClasses[] = "sitedir-$sitedir";
2724
2725                 if ( $this->getLanguage()->capitalizeAllNouns() ) {
2726                         # A <body> class is probably not the best way to do this . . .
2727                         $bodyClasses[] = 'capitalize-all-nouns';
2728                 }
2729
2730                 $bodyClasses[] = $sk->getPageClasses( $this->getTitle() );
2731                 $bodyClasses[] = 'skin-' . Sanitizer::escapeClass( $sk->getSkinName() );
2732                 $bodyClasses[] =
2733                         'action-' . Sanitizer::escapeClass( Action::getActionName( $this->getContext() ) );
2734
2735                 $bodyAttrs = array();
2736                 // While the implode() is not strictly needed, it's used for backwards compatibility
2737                 // (this used to be built as a string and hooks likely still expect that).
2738                 $bodyAttrs['class'] = implode( ' ', $bodyClasses );
2739
2740                 // Allow skins and extensions to add body attributes they need
2741                 $sk->addToBodyAttributes( $this, $bodyAttrs );
2742                 Hooks::run( 'OutputPageBodyAttributes', array( $this, $sk, &$bodyAttrs ) );
2743
2744                 $ret .= Html::openElement( 'body', $bodyAttrs ) . "\n";
2745
2746                 return $ret;
2747         }
2748
2749         /**
2750          * Get a ResourceLoader object associated with this OutputPage
2751          *
2752          * @return ResourceLoader
2753          */
2754         public function getResourceLoader() {
2755                 if ( is_null( $this->mResourceLoader ) ) {
2756                         $this->mResourceLoader = new ResourceLoader(
2757                                 $this->getConfig(),
2758                                 LoggerFactory::getInstance( 'resourceloader' )
2759                         );
2760                 }
2761                 return $this->mResourceLoader;
2762         }
2763
2764         /**
2765          * @todo Document
2766          * @param array|string $modules One or more module names
2767          * @param string $only ResourceLoaderModule TYPE_ class constant
2768          * @param array $extraQuery Array with extra query parameters to add to each
2769          *   request. array( param => value ).
2770          * @param bool $loadCall If true, output an (asynchronous) mw.loader.load()
2771          *   call rather than a "<script src='...'>" tag.
2772          * @return string The html "<script>", "<link>" and "<style>" tags
2773          */
2774         public function makeResourceLoaderLink( $modules, $only, array $extraQuery = array(),
2775                 $loadCall = false
2776         ) {
2777                 $modules = (array)$modules;
2778
2779                 $links = array(
2780                         // List of html strings
2781                         'html' => array(),
2782                         // Associative array of module names and their states
2783                         'states' => array(),
2784                 );
2785
2786                 if ( !count( $modules ) ) {
2787                         return $links;
2788                 }
2789
2790                 if ( count( $modules ) > 1 ) {
2791                         // Remove duplicate module requests
2792                         $modules = array_unique( $modules );
2793                         // Sort module names so requests are more uniform
2794                         sort( $modules );
2795
2796                         if ( ResourceLoader::inDebugMode() ) {
2797                                 // Recursively call us for every item
2798                                 foreach ( $modules as $name ) {
2799                                         $link = $this->makeResourceLoaderLink( $name, $only );
2800                                         $links['html'] = array_merge( $links['html'], $link['html'] );
2801                                         $links['states'] += $link['states'];
2802                                 }
2803                                 return $links;
2804                         }
2805                 }
2806
2807                 if ( !is_null( $this->mTarget ) ) {
2808                         $extraQuery['target'] = $this->mTarget;
2809                 }
2810
2811                 // Create keyed-by-source and then keyed-by-group list of module objects from modules list
2812                 $sortedModules = array();
2813                 $resourceLoader = $this->getResourceLoader();
2814                 foreach ( $modules as $name ) {
2815                         $module = $resourceLoader->getModule( $name );
2816                         # Check that we're allowed to include this module on this page
2817                         if ( !$module
2818                                 || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_SCRIPTS )
2819                                         && $only == ResourceLoaderModule::TYPE_SCRIPTS )
2820                                 || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_STYLES )
2821                                         && $only == ResourceLoaderModule::TYPE_STYLES )
2822                                 || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_COMBINED )
2823                                         && $only == ResourceLoaderModule::TYPE_COMBINED )
2824                                 || ( $this->mTarget && !in_array( $this->mTarget, $module->getTargets() ) )
2825                         ) {
2826                                 continue;
2827                         }
2828
2829                         $sortedModules[$module->getSource()][$module->getGroup()][$name] = $module;
2830                 }
2831
2832                 foreach ( $sortedModules as $source => $groups ) {
2833                         foreach ( $groups as $group => $grpModules ) {
2834                                 // Special handling for user-specific groups
2835                                 $user = null;
2836                                 if ( ( $group === 'user' || $group === 'private' ) && $this->getUser()->isLoggedIn() ) {
2837                                         $user = $this->getUser()->getName();
2838                                 }
2839
2840                                 // Create a fake request based on the one we are about to make so modules return
2841                                 // correct timestamp and emptiness data
2842                                 $query = ResourceLoader::makeLoaderQuery(
2843                                         array(), // modules; not determined yet
2844                                         $this->getLanguage()->getCode(),
2845                                         $this->getSkin()->getSkinName(),
2846                                         $user,
2847                                         null, // version; not determined yet
2848                                         ResourceLoader::inDebugMode(),
2849                                         $only === ResourceLoaderModule::TYPE_COMBINED ? null : $only,
2850                                         $this->isPrintable(),
2851                                         $this->getRequest()->getBool( 'handheld' ),
2852                                         $extraQuery
2853                                 );
2854                                 $context = new ResourceLoaderContext( $resourceLoader, new FauxRequest( $query ) );
2855
2856                                 // Extract modules that know they're empty and see if we have one or more
2857                                 // raw modules
2858                                 $isRaw = false;
2859                                 foreach ( $grpModules as $key => $module ) {
2860                                         // Inline empty modules: since they're empty, just mark them as 'ready' (bug 46857)
2861                                         // If we're only getting the styles, we don't need to do anything for empty modules.
2862                                         if ( $module->isKnownEmpty( $context ) ) {
2863                                                 unset( $grpModules[$key] );
2864                                                 if ( $only !== ResourceLoaderModule::TYPE_STYLES ) {
2865                                                         $links['states'][$key] = 'ready';
2866                                                 }
2867                                         }
2868
2869                                         $isRaw |= $module->isRaw();
2870                                 }
2871
2872                                 // If there are no non-empty modules, skip this group
2873                                 if ( count( $grpModules ) === 0 ) {
2874                                         continue;
2875                                 }
2876
2877                                 // Inline private modules. These can't be loaded through load.php for security
2878                                 // reasons, see bug 34907. Note that these modules should be loaded from
2879                                 // getHeadScripts() before the first loader call. Otherwise other modules can't
2880                                 // properly use them as dependencies (bug 30914)
2881                                 if ( $group === 'private' ) {
2882                                         if ( $only == ResourceLoaderModule::TYPE_STYLES ) {
2883                                                 $links['html'][] = Html::inlineStyle(
2884                                                         $resourceLoader->makeModuleResponse( $context, $grpModules )
2885                                                 );
2886                                         } else {
2887                                                 $links['html'][] = ResourceLoader::makeInlineScript(
2888                                                         $resourceLoader->makeModuleResponse( $context, $grpModules )
2889                                                 );
2890                                         }
2891                                         continue;
2892                                 }
2893
2894                                 // Special handling for the user group; because users might change their stuff
2895                                 // on-wiki like user pages, or user preferences; we need to find the highest
2896                                 // timestamp of these user-changeable modules so we can ensure cache misses on change
2897                                 // This should NOT be done for the site group (bug 27564) because anons get that too
2898                                 // and we shouldn't be putting timestamps in Squid-cached HTML
2899                                 $version = null;
2900                                 if ( $group === 'user' ) {
2901                                         $query['version'] = $resourceLoader->getCombinedVersion( $context, array_keys( $grpModules ) );
2902                                 }
2903
2904                                 $query['modules'] = ResourceLoader::makePackedModulesString( array_keys( $grpModules ) );
2905                                 $moduleContext = new ResourceLoaderContext( $resourceLoader, new FauxRequest( $query ) );
2906                                 $url = $resourceLoader->createLoaderURL( $source, $moduleContext, $extraQuery );
2907
2908                                 // Automatically select style/script elements
2909                                 if ( $only === ResourceLoaderModule::TYPE_STYLES ) {
2910                                         $link = Html::linkedStyle( $url );
2911                                 } elseif ( $loadCall ) {
2912                                         $link = ResourceLoader::makeInlineScript(
2913                                                 Xml::encodeJsCall( 'mw.loader.load', array( $url, 'text/javascript', true ) )
2914                                         );
2915                                 } else {
2916                                         $link = Html::linkedScript( $url );
2917                                         if ( !$context->getRaw() && !$isRaw ) {
2918                                                 // Wrap only=script / only=combined requests in a conditional as
2919                                                 // browsers not supported by the startup module would unconditionally
2920                                                 // execute this module. Otherwise users will get "ReferenceError: mw is
2921                                                 // undefined" or "jQuery is undefined" from e.g. a "site" module.
2922                                                 $link = ResourceLoader::makeInlineScript(
2923                                                         Xml::encodeJsCall( 'document.write', array( $link ) )
2924                                                 );
2925                                         }
2926
2927                                         // For modules requested directly in the html via <link> or <script>,
2928                                         // tell mw.loader they are being loading to prevent duplicate requests.
2929                                         foreach ( $grpModules as $key => $module ) {
2930                                                 // Don't output state=loading for the startup module..
2931                                                 if ( $key !== 'startup' ) {
2932                                                         $links['states'][$key] = 'loading';
2933                                                 }
2934                                         }
2935                                 }
2936
2937                                 if ( $group == 'noscript' ) {
2938                                         $links['html'][] = Html::rawElement( 'noscript', array(), $link );
2939                                 } else {
2940                                         $links['html'][] = $link;
2941                                 }
2942                         }
2943                 }
2944
2945                 return $links;
2946         }
2947
2948         /**
2949          * Build html output from an array of links from makeResourceLoaderLink.
2950          * @param array $links
2951          * @return string HTML
2952          */
2953         protected static function getHtmlFromLoaderLinks( array $links ) {
2954                 $html = array();
2955                 $states = array();
2956                 foreach ( $links as $link ) {
2957                         if ( !is_array( $link ) ) {
2958                                 $html[] = $link;
2959                         } else {
2960                                 $html = array_merge( $html, $link['html'] );
2961                                 $states += $link['states'];
2962                         }
2963                 }
2964                 // Filter out empty values
2965                 $html = array_filter( $html, 'strlen' );
2966
2967                 if ( count( $states ) ) {
2968                         array_unshift( $html, ResourceLoader::makeInlineScript(
2969                                 ResourceLoader::makeLoaderStateScript( $states )
2970                         ) );
2971                 }
2972
2973                 return WrappedString::join( "\n", $html );
2974         }
2975
2976         /**
2977          * JS stuff to put in the "<head>". This is the startup module, config
2978          * vars and modules marked with position 'top'
2979          *
2980          * @return string HTML fragment
2981          */
2982         function getHeadScripts() {
2983                 // Startup - this will immediately load jquery and mediawiki modules
2984                 $links = array();
2985                 $links[] = $this->makeResourceLoaderLink( 'startup', ResourceLoaderModule::TYPE_SCRIPTS );
2986
2987                 // Load config before anything else
2988                 $links[] = ResourceLoader::makeInlineScript(
2989                         ResourceLoader::makeConfigSetScript( $this->getJSVars() )
2990                 );
2991
2992                 // Load embeddable private modules before any loader links
2993                 // This needs to be TYPE_COMBINED so these modules are properly wrapped
2994                 // in mw.loader.implement() calls and deferred until mw.user is available
2995                 $embedScripts = array( 'user.options' );
2996                 $links[] = $this->makeResourceLoaderLink( $embedScripts, ResourceLoaderModule::TYPE_COMBINED );
2997                 // Separate user.tokens as otherwise caching will be allowed (T84960)
2998                 $links[] = $this->makeResourceLoaderLink( 'user.tokens', ResourceLoaderModule::TYPE_COMBINED );
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                 // "Scripts only" modules marked for top inclusion
3010                 $links[] = $this->makeResourceLoaderLink(
3011                         $this->getModuleScripts( true, 'top' ),
3012                         ResourceLoaderModule::TYPE_SCRIPTS
3013                 );
3014
3015                 if ( $this->getConfig()->get( 'ResourceLoaderExperimentalAsyncLoading' ) ) {
3016                         $links[] = $this->getScriptsForBottomQueue( true );
3017                 }
3018
3019                 return self::getHtmlFromLoaderLinks( $links );
3020         }
3021
3022         /**
3023          * JS stuff to put at the 'bottom', which can either be the bottom of the
3024          * "<body>" or the bottom of the "<head>" depending on
3025          * $wgResourceLoaderExperimentalAsyncLoading: modules marked with position
3026          * 'bottom', legacy scripts ($this->mScripts), user preferences, site JS
3027          * and user JS.
3028          *
3029          * @param bool $inHead If true, this HTML goes into the "<head>",
3030          *   if false it goes into the "<body>".
3031          * @return string
3032          */
3033         function getScriptsForBottomQueue( $inHead ) {
3034                 // Scripts "only" requests marked for bottom inclusion
3035                 // If we're in the <head>, use load() calls rather than <script src="..."> tags
3036                 $links = array();
3037
3038                 $links[] = $this->makeResourceLoaderLink( $this->getModuleScripts( true, 'bottom' ),
3039                         ResourceLoaderModule::TYPE_SCRIPTS, /* $extraQuery = */ array(),
3040                         /* $loadCall = */ $inHead
3041                 );
3042
3043                 $links[] = $this->makeResourceLoaderLink( $this->getModuleStyles( true, 'bottom' ),
3044                         ResourceLoaderModule::TYPE_STYLES, /* $extraQuery = */ array(),
3045                         /* $loadCall = */ $inHead
3046                 );
3047
3048                 // Modules requests - let the client calculate dependencies and batch requests as it likes
3049                 // Only load modules that have marked themselves for loading at the bottom
3050                 $modules = $this->getModules( true, 'bottom' );
3051                 if ( $modules ) {
3052                         $links[] = ResourceLoader::makeInlineScript(
3053                                 Xml::encodeJsCall( 'mw.loader.load', array( $modules, null, true ) )
3054                         );
3055                 }
3056
3057                 // Legacy Scripts
3058                 $links[] = $this->mScripts;
3059
3060                 // Add user JS if enabled
3061                 // This must use TYPE_COMBINED instead of only=scripts so that its request is handled by
3062                 // mw.loader.implement() which ensures that execution is scheduled after the "site" module.
3063                 if ( $this->getConfig()->get( 'AllowUserJs' )
3064                         && $this->getUser()->isLoggedIn()
3065                         && $this->getTitle()
3066                         && $this->getTitle()->isJsSubpage()
3067                         && $this->userCanPreview()
3068                 ) {
3069                         // We're on a preview of a JS subpage. Exclude this page from the user module (T28283)
3070                         // and include the draft contents as a raw script instead.
3071                         $links[] = $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_COMBINED,
3072                                 array( 'excludepage' => $this->getTitle()->getPrefixedDBkey() ), $inHead
3073                         );
3074                         // Load the previewed JS
3075                         $links[] = ResourceLoader::makeInlineScript(
3076                                 Xml::encodeJsCall( 'mw.loader.using', array(
3077                                         array( 'user', 'site' ),
3078                                         new XmlJsCode(
3079                                                 'function () {'
3080                                                         . Xml::encodeJsCall( '$.globalEval', array(
3081                                                                 $this->getRequest()->getText( 'wpTextbox1' )
3082                                                         ) )
3083                                                         . '}'
3084                                         )
3085                                 ) )
3086                         );
3087
3088                         // FIXME: If the user is previewing, say, ./vector.js, his ./common.js will be loaded
3089                         // asynchronously and may arrive *after* the inline script here. So the previewed code
3090                         // may execute before ./common.js runs. Normally, ./common.js runs before ./vector.js.
3091                         // Similarly, when previewing ./common.js and the user module does arrive first, it will
3092                         // arrive without common.js and the inline script runs after. Thus running common after
3093                         // the excluded subpage.
3094                 } else {
3095                         // Include the user module normally, i.e., raw to avoid it being wrapped in a closure.
3096                         $links[] = $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_COMBINED,
3097                                 /* $extraQuery = */ array(), /* $loadCall = */ $inHead
3098                         );
3099                 }
3100
3101                 // Group JS is only enabled if site JS is enabled.
3102                 $links[] = $this->makeResourceLoaderLink( 'user.groups', ResourceLoaderModule::TYPE_COMBINED,
3103                         /* $extraQuery = */ array(), /* $loadCall = */ $inHead
3104                 );
3105
3106                 return self::getHtmlFromLoaderLinks( $links );
3107         }
3108
3109         /**
3110          * JS stuff to put at the bottom of the "<body>"
3111          * @return string
3112          */
3113         function getBottomScripts() {
3114                 // In case the skin wants to add bottom CSS
3115                 $this->getSkin()->setupSkinUserCss( $this );
3116
3117                 // Optimise jQuery ready event cross-browser.
3118                 // This also enforces $.isReady to be true at </body> which fixes the
3119                 // mw.loader bug in Firefox with using document.write between </body>
3120                 // and the DOMContentReady event (bug 47457).
3121                 $html = Html::inlineScript( 'if(window.jQuery)jQuery.ready();' );
3122
3123                 if ( !$this->getConfig()->get( 'ResourceLoaderExperimentalAsyncLoading' ) ) {
3124                         $html .= $this->getScriptsForBottomQueue( false );
3125                 }
3126
3127                 return $html;
3128         }
3129
3130         /**
3131          * Get the javascript config vars to include on this page
3132          *
3133          * @return array Array of javascript config vars
3134          * @since 1.23
3135          */
3136         public function getJsConfigVars() {
3137                 return $this->mJsConfigVars;
3138         }
3139
3140         /**
3141          * Add one or more variables to be set in mw.config in JavaScript
3142          *
3143          * @param string|array $keys Key or array of key/value pairs
3144          * @param mixed $value [optional] Value of the configuration variable
3145          */
3146         public function addJsConfigVars( $keys, $value = null ) {
3147                 if ( is_array( $keys ) ) {
3148                         foreach ( $keys as $key => $value ) {
3149                                 $this->mJsConfigVars[$key] = $value;
3150                         }
3151                         return;
3152                 }
3153
3154                 $this->mJsConfigVars[$keys] = $value;
3155         }
3156
3157         /**
3158          * Get an array containing the variables to be set in mw.config in JavaScript.
3159          *
3160          * Do not add things here which can be evaluated in ResourceLoaderStartUpModule
3161          * - in other words, page-independent/site-wide variables (without state).
3162          * You will only be adding bloat to the html page and causing page caches to
3163          * have to be purged on configuration changes.
3164          * @return array
3165          */
3166         public function getJSVars() {
3167                 global $wgContLang;
3168
3169                 $curRevisionId = 0;
3170                 $articleId = 0;
3171                 $canonicalSpecialPageName = false; # bug 21115
3172
3173                 $title = $this->getTitle();
3174                 $ns = $title->getNamespace();
3175                 $canonicalNamespace = MWNamespace::exists( $ns )
3176                         ? MWNamespace::getCanonicalName( $ns )
3177                         : $title->getNsText();
3178
3179                 $sk = $this->getSkin();
3180                 // Get the relevant title so that AJAX features can use the correct page name
3181                 // when making API requests from certain special pages (bug 34972).
3182                 $relevantTitle = $sk->getRelevantTitle();
3183                 $relevantUser = $sk->getRelevantUser();
3184
3185                 if ( $ns == NS_SPECIAL ) {
3186                         list( $canonicalSpecialPageName, /*...*/ ) =
3187                                 SpecialPageFactory::resolveAlias( $title->getDBkey() );
3188                 } elseif ( $this->canUseWikiPage() ) {
3189                         $wikiPage = $this->getWikiPage();
3190                         $curRevisionId = $wikiPage->getLatest();
3191                         $articleId = $wikiPage->getId();
3192                 }
3193
3194                 $lang = $title->getPageLanguage();
3195
3196                 // Pre-process information
3197                 $separatorTransTable = $lang->separatorTransformTable();
3198                 $separatorTransTable = $separatorTransTable ? $separatorTransTable : array();
3199                 $compactSeparatorTransTable = array(
3200                         implode( "\t", array_keys( $separatorTransTable ) ),
3201                         implode( "\t", $separatorTransTable ),
3202                 );
3203                 $digitTransTable = $lang->digitTransformTable();
3204                 $digitTransTable = $digitTransTable ? $digitTransTable : array();
3205                 $compactDigitTransTable = array(
3206                         implode( "\t", array_keys( $digitTransTable ) ),
3207                         implode( "\t", $digitTransTable ),
3208                 );
3209
3210                 $user = $this->getUser();
3211
3212                 $vars = array(
3213                         'wgCanonicalNamespace' => $canonicalNamespace,
3214                         'wgCanonicalSpecialPageName' => $canonicalSpecialPageName,
3215                         'wgNamespaceNumber' => $title->getNamespace(),
3216                         'wgPageName' => $title->getPrefixedDBkey(),
3217                         'wgTitle' => $title->getText(),
3218                         'wgCurRevisionId' => $curRevisionId,
3219                         'wgRevisionId' => (int)$this->getRevisionId(),
3220                         'wgArticleId' => $articleId,
3221                         'wgIsArticle' => $this->isArticle(),
3222                         'wgIsRedirect' => $title->isRedirect(),
3223                         'wgAction' => Action::getActionName( $this->getContext() ),
3224                         'wgUserName' => $user->isAnon() ? null : $user->getName(),
3225                         'wgUserGroups' => $user->getEffectiveGroups(),
3226                         'wgCategories' => $this->getCategories(),
3227                         'wgBreakFrames' => $this->getFrameOptions() == 'DENY',
3228                         'wgPageContentLanguage' => $lang->getCode(),
3229                         'wgPageContentModel' => $title->getContentModel(),
3230                         'wgSeparatorTransformTable' => $compactSeparatorTransTable,
3231                         'wgDigitTransformTable' => $compactDigitTransTable,
3232                         'wgDefaultDateFormat' => $lang->getDefaultDateFormat(),
3233                         'wgMonthNames' => $lang->getMonthNamesArray(),
3234                         'wgMonthNamesShort' => $lang->getMonthAbbreviationsArray(),
3235                         'wgRelevantPageName' => $relevantTitle->getPrefixedDBkey(),
3236                         'wgRelevantArticleId' => $relevantTitle->getArticleId(),
3237                 );
3238
3239                 if ( $user->isLoggedIn() ) {
3240                         $vars['wgUserId'] = $user->getId();
3241                         $vars['wgUserEditCount'] = $user->getEditCount();
3242                         $userReg = wfTimestampOrNull( TS_UNIX, $user->getRegistration() );
3243                         $vars['wgUserRegistration'] = $userReg !== null ? ( $userReg * 1000 ) : null;
3244                         // Get the revision ID of the oldest new message on the user's talk
3245                         // page. This can be used for constructing new message alerts on
3246                         // the client side.
3247                         $vars['wgUserNewMsgRevisionId'] = $user->getNewMessageRevisionId();
3248                 }
3249
3250                 if ( $wgContLang->hasVariants() ) {
3251                         $vars['wgUserVariant'] = $wgContLang->getPreferredVariant();
3252                 }
3253                 // Same test as SkinTemplate
3254                 $vars['wgIsProbablyEditable'] = $title->quickUserCan( 'edit', $user )
3255                         && ( $title->exists() || $title->quickUserCan( 'create', $user ) );
3256
3257                 foreach ( $title->getRestrictionTypes() as $type ) {
3258                         $vars['wgRestriction' . ucfirst( $type )] = $title->getRestrictions( $type );
3259                 }
3260
3261                 if ( $title->isMainPage() ) {
3262                         $vars['wgIsMainPage'] = true;
3263                 }
3264
3265                 if ( $this->mRedirectedFrom ) {
3266                         $vars['wgRedirectedFrom'] = $this->mRedirectedFrom->getPrefixedDBkey();
3267                 }
3268
3269                 if ( $relevantUser ) {
3270                         $vars['wgRelevantUserName'] = $relevantUser->getName();
3271                 }
3272
3273                 // Allow extensions to add their custom variables to the mw.config map.
3274                 // Use the 'ResourceLoaderGetConfigVars' hook if the variable is not
3275                 // page-dependant but site-wide (without state).
3276                 // Alternatively, you may want to use OutputPage->addJsConfigVars() instead.
3277                 Hooks::run( 'MakeGlobalVariablesScript', array( &$vars, $this ) );
3278
3279                 // Merge in variables from addJsConfigVars last
3280                 return array_merge( $vars, $this->getJsConfigVars() );
3281         }
3282
3283         /**
3284          * To make it harder for someone to slip a user a fake
3285          * user-JavaScript or user-CSS preview, a random token
3286          * is associated with the login session. If it's not
3287          * passed back with the preview request, we won't render
3288          * the code.
3289          *
3290          * @return bool
3291          */
3292         public function userCanPreview() {
3293                 if ( $this->getRequest()->getVal( 'action' ) != 'submit'
3294                         || !$this->getRequest()->wasPosted()
3295                         || !$this->getUser()->matchEditToken(
3296                                 $this->getRequest()->getVal( 'wpEditToken' ) )
3297                 ) {
3298                         return false;
3299                 }
3300                 if ( !$this->getTitle()->isJsSubpage() && !$this->getTitle()->isCssSubpage() ) {
3301                         return false;
3302                 }
3303                 if ( !$this->getTitle()->isSubpageOf( $this->getUser()->getUserPage() ) ) {
3304                         // Don't execute another user's CSS or JS on preview (T85855)
3305                         return false;
3306                 }
3307
3308                 return !count( $this->getTitle()->getUserPermissionsErrors( 'edit', $this->getUser() ) );
3309         }
3310
3311         /**
3312          * @return array Array in format "link name or number => 'link html'".
3313          */
3314         public function getHeadLinksArray() {
3315                 global $wgVersion;
3316
3317                 $tags = array();
3318                 $config = $this->getConfig();
3319
3320                 $canonicalUrl = $this->mCanonicalUrl;
3321
3322                 $tags['meta-generator'] = Html::element( 'meta', array(
3323                         'name' => 'generator',
3324                         'content' => "MediaWiki $wgVersion",
3325                 ) );
3326
3327                 if ( $config->get( 'ReferrerPolicy' ) !== false ) {
3328                         $tags['meta-referrer'] = Html::element( 'meta', array(
3329                                 'name' => 'referrer',
3330                                 'content' => $config->get( 'ReferrerPolicy' )
3331                         ) );
3332                 }
3333
3334                 $p = "{$this->mIndexPolicy},{$this->mFollowPolicy}";
3335                 if ( $p !== 'index,follow' ) {
3336                         // http://www.robotstxt.org/wc/meta-user.html
3337                         // Only show if it's different from the default robots policy
3338                         $tags['meta-robots'] = Html::element( 'meta', array(
3339                                 'name' => 'robots',
3340                                 'content' => $p,
3341                         ) );
3342                 }
3343
3344                 foreach ( $this->mMetatags as $tag ) {
3345                         if ( 0 == strcasecmp( 'http:', substr( $tag[0], 0, 5 ) ) ) {
3346                                 $a = 'http-equiv';
3347                                 $tag[0] = substr( $tag[0], 5 );
3348                         } else {
3349                                 $a = 'name';
3350                         }
3351                         $tagName = "meta-{$tag[0]}";
3352                         if ( isset( $tags[$tagName] ) ) {
3353                                 $tagName .= $tag[1];
3354                         }
3355                         $tags[$tagName] = Html::element( 'meta',
3356                                 array(
3357                                         $a => $tag[0],
3358                                         'content' => $tag[1]
3359                                 )
3360                         );
3361                 }
3362
3363                 foreach ( $this->mLinktags as $tag ) {
3364                         $tags[] = Html::element( 'link', $tag );
3365                 }
3366
3367                 # Universal edit button
3368                 if ( $config->get( 'UniversalEditButton' ) && $this->isArticleRelated() ) {
3369                         $user = $this->getUser();
3370                         if ( $this->getTitle()->quickUserCan( 'edit', $user )
3371                                 && ( $this->getTitle()->exists() || $this->getTitle()->quickUserCan( 'create', $user ) ) ) {
3372                                 // Original UniversalEditButton
3373                                 $msg = $this->msg( 'edit' )->text();
3374                                 $tags['universal-edit-button'] = Html::element( 'link', array(
3375                                         'rel' => 'alternate',
3376                                         'type' => 'application/x-wiki',
3377                                         'title' => $msg,
3378                                         'href' => $this->getTitle()->getEditURL(),
3379                                 ) );
3380                                 // Alternate edit link
3381                                 $tags['alternative-edit'] = Html::element( 'link', array(
3382                                         'rel' => 'edit',
3383                                         'title' => $msg,
3384                                         'href' => $this->getTitle()->getEditURL(),
3385                                 ) );
3386                         }
3387                 }
3388
3389                 # Generally the order of the favicon and apple-touch-icon links
3390                 # should not matter, but Konqueror (3.5.9 at least) incorrectly
3391                 # uses whichever one appears later in the HTML source. Make sure
3392                 # apple-touch-icon is specified first to avoid this.
3393                 if ( $config->get( 'AppleTouchIcon' ) !== false ) {
3394                         $tags['apple-touch-icon'] = Html::element( 'link', array(
3395                                 'rel' => 'apple-touch-icon',
3396                                 'href' => $config->get( 'AppleTouchIcon' )
3397                         ) );
3398                 }
3399
3400                 if ( $config->get( 'Favicon' ) !== false ) {
3401                         $tags['favicon'] = Html::element( 'link', array(
3402                                 'rel' => 'shortcut icon',
3403                                 'href' => $config->get( 'Favicon' )
3404                         ) );
3405                 }
3406
3407                 # OpenSearch description link
3408                 $tags['opensearch'] = Html::element( 'link', array(
3409                         'rel' => 'search',
3410                         'type' => 'application/opensearchdescription+xml',
3411                         'href' => wfScript( 'opensearch_desc' ),
3412                         'title' => $this->msg( 'opensearch-desc' )->inContentLanguage()->text(),
3413                 ) );
3414
3415                 if ( $config->get( 'EnableAPI' ) ) {
3416                         # Real Simple Discovery link, provides auto-discovery information
3417                         # for the MediaWiki API (and potentially additional custom API
3418                         # support such as WordPress or Twitter-compatible APIs for a
3419                         # blogging extension, etc)
3420                         $tags['rsd'] = Html::element( 'link', array(
3421                                 'rel' => 'EditURI',
3422                                 'type' => 'application/rsd+xml',
3423                                 // Output a protocol-relative URL here if $wgServer is protocol-relative
3424                                 // Whether RSD accepts relative or protocol-relative URLs is completely undocumented, though
3425                                 'href' => wfExpandUrl( wfAppendQuery(
3426                                         wfScript( 'api' ),
3427                                         array( 'action' => 'rsd' ) ),
3428                                         PROTO_RELATIVE
3429                                 ),
3430                         ) );
3431                 }
3432
3433                 # Language variants
3434                 if ( !$config->get( 'DisableLangConversion' ) ) {
3435                         $lang = $this->getTitle()->getPageLanguage();
3436                         if ( $lang->hasVariants() ) {
3437                                 $variants = $lang->getVariants();
3438                                 foreach ( $variants as $variant ) {
3439                                         $tags["variant-$variant"] = Html::element( 'link', array(
3440                                                 'rel' => 'alternate',
3441                                                 'hreflang' => wfBCP47( $variant ),
3442                                                 'href' => $this->getTitle()->getLocalURL( array( 'variant' => $variant ) ) )
3443                                         );
3444                                 }
3445                                 # x-default link per https://support.google.com/webmasters/answer/189077?hl=en
3446                                 $tags["variant-x-default"] = Html::element( 'link', array(
3447                                         'rel' => 'alternate',
3448                                         'hreflang' => 'x-default',
3449                                         'href' => $this->getTitle()->getLocalURL() ) );
3450                         }
3451                 }
3452
3453                 # Copyright
3454                 if ( $this->copyrightUrl !== null ) {
3455                         $copyright = $this->copyrightUrl;
3456                 } else {
3457                         $copyright = '';
3458                         if ( $config->get( 'RightsPage' ) ) {
3459                                 $copy = Title::newFromText( $config->get( 'RightsPage' ) );
3460
3461                                 if ( $copy ) {
3462                                         $copyright = $copy->getLocalURL();
3463                                 }
3464                         }
3465
3466                         if ( !$copyright && $config->get( 'RightsUrl' ) ) {
3467                                 $copyright = $config->get( 'RightsUrl' );
3468                         }
3469                 }
3470
3471                 if ( $copyright ) {
3472                         $tags['copyright'] = Html::element( 'link', array(
3473                                 'rel' => 'copyright',
3474                                 'href' => $copyright )
3475                         );
3476                 }
3477
3478                 # Feeds
3479                 if ( $config->get( 'Feed' ) ) {
3480                         foreach ( $this->getSyndicationLinks() as $format => $link ) {
3481                                 # Use the page name for the title.  In principle, this could
3482                                 # lead to issues with having the same name for different feeds
3483                                 # corresponding to the same page, but we can't avoid that at
3484                                 # this low a level.
3485
3486                                 $tags[] = $this->feedLink(
3487                                         $format,
3488                                         $link,
3489                                         # Used messages: 'page-rss-feed' and 'page-atom-feed' (for an easier grep)
3490                                         $this->msg( "page-{$format}-feed", $this->getTitle()->getPrefixedText() )->text()
3491                                 );
3492                         }
3493
3494                         # Recent changes feed should appear on every page (except recentchanges,
3495                         # that would be redundant). Put it after the per-page feed to avoid
3496                         # changing existing behavior. It's still available, probably via a
3497                         # menu in your browser. Some sites might have a different feed they'd
3498                         # like to promote instead of the RC feed (maybe like a "Recent New Articles"
3499                         # or "Breaking news" one). For this, we see if $wgOverrideSiteFeed is defined.
3500                         # If so, use it instead.
3501                         $sitename = $config->get( 'Sitename' );
3502                         if ( $config->get( 'OverrideSiteFeed' ) ) {
3503                                 foreach ( $config->get( 'OverrideSiteFeed' ) as $type => $feedUrl ) {
3504                                         // Note, this->feedLink escapes the url.
3505                                         $tags[] = $this->feedLink(
3506                                                 $type,
3507                                                 $feedUrl,
3508                                                 $this->msg( "site-{$type}-feed", $sitename )->text()
3509                                         );
3510                                 }
3511                         } elseif ( !$this->getTitle()->isSpecial( 'Recentchanges' ) ) {
3512                                 $rctitle = SpecialPage::getTitleFor( 'Recentchanges' );
3513                                 foreach ( $config->get( 'AdvertisedFeedTypes' ) as $format ) {
3514                                         $tags[] = $this->feedLink(
3515                                                 $format,
3516                                                 $rctitle->getLocalURL( array( 'feed' => $format ) ),
3517                                                 # For grep: 'site-rss-feed', 'site-atom-feed'
3518                                                 $this->msg( "site-{$format}-feed", $sitename )->text()
3519                                         );
3520                                 }
3521                         }
3522                 }
3523
3524                 # Canonical URL
3525                 if ( $config->get( 'EnableCanonicalServerLink' ) ) {
3526                         if ( $canonicalUrl !== false ) {
3527                                 $canonicalUrl = wfExpandUrl( $canonicalUrl, PROTO_CANONICAL );
3528                         } else {
3529                                 if ( $this->isArticleRelated() ) {
3530                                         // This affects all requests where "setArticleRelated" is true. This is
3531                                         // typically all requests that show content (query title, curid, oldid, diff),
3532                                         // and all wikipage actions (edit, delete, purge, info, history etc.).
3533                                         // It does not apply to File pages and Special pages.
3534                                         // 'history' and 'info' actions address page metadata rather than the page
3535                                         // content itself, so they may not be canonicalized to the view page url.
3536                                         // TODO: this ought to be better encapsulated in the Action class.
3537                                         $action = Action::getActionName( $this->getContext() );
3538                                         if ( in_array( $action, array( 'history', 'info' ) ) ) {
3539                                                 $query = "action={$action}";
3540                                         } else {
3541                                                 $query = '';
3542                                         }
3543                                         $canonicalUrl = $this->getTitle()->getCanonicalURL( $query );
3544                                 } else {
3545                                         $reqUrl = $this->getRequest()->getRequestURL();
3546                                         $canonicalUrl = wfExpandUrl( $reqUrl, PROTO_CANONICAL );
3547                                 }
3548                         }
3549                 }
3550                 if ( $canonicalUrl !== false ) {
3551                         $tags[] = Html::element( 'link', array(
3552                                 'rel' => 'canonical',
3553                                 'href' => $canonicalUrl
3554                         ) );
3555                 }
3556
3557                 return $tags;
3558         }
3559
3560         /**
3561          * @return string HTML tag links to be put in the header.
3562          * @deprecated since 1.24 Use OutputPage::headElement or if you have to,
3563          *   OutputPage::getHeadLinksArray directly.
3564          */
3565         public function getHeadLinks() {
3566                 wfDeprecated( __METHOD__, '1.24' );
3567                 return implode( "\n", $this->getHeadLinksArray() );
3568         }
3569
3570         /**
3571          * Generate a "<link rel/>" for a feed.
3572          *
3573          * @param string $type Feed type
3574          * @param string $url URL to the feed
3575          * @param string $text Value of the "title" attribute
3576          * @return string HTML fragment
3577          */
3578         private function feedLink( $type, $url, $text ) {
3579                 return Html::element( 'link', array(
3580                         'rel' => 'alternate',
3581                         'type' => "application/$type+xml",
3582                         'title' => $text,
3583                         'href' => $url )
3584                 );
3585         }
3586
3587         /**
3588          * Add a local or specified stylesheet, with the given media options.
3589          * Meant primarily for internal use...
3590          *
3591          * @param string $style URL to the file
3592          * @param string $media To specify a media type, 'screen', 'printable', 'handheld' or any.
3593          * @param string $condition For IE conditional comments, specifying an IE version
3594          * @param string $dir Set to 'rtl' or 'ltr' for direction-specific sheets
3595          */
3596         public function addStyle( $style, $media = '', $condition = '', $dir = '' ) {
3597                 $options = array();
3598                 // Even though we expect the media type to be lowercase, but here we
3599                 // force it to lowercase to be safe.
3600                 if ( $media ) {
3601                         $options['media'] = $media;
3602                 }
3603                 if ( $condition ) {
3604                         $options['condition'] = $condition;
3605                 }
3606                 if ( $dir ) {
3607                         $options['dir'] = $dir;
3608                 }
3609                 $this->styles[$style] = $options;
3610         }
3611
3612         /**
3613          * Adds inline CSS styles
3614          * @param mixed $style_css Inline CSS
3615          * @param string $flip Set to 'flip' to flip the CSS if needed
3616          */
3617         public function addInlineStyle( $style_css, $flip = 'noflip' ) {
3618                 if ( $flip === 'flip' && $this->getLanguage()->isRTL() ) {
3619                         # If wanted, and the interface is right-to-left, flip the CSS
3620                         $style_css = CSSJanus::transform( $style_css, true, false );
3621                 }
3622                 $this->mInlineStyles .= Html::inlineStyle( $style_css ) . "\n";
3623         }
3624
3625         /**
3626          * Build a set of "<link>" elements for the stylesheets specified in the $this->styles array.
3627          * These will be applied to various media & IE conditionals.
3628          *
3629          * @return string
3630          */
3631         public function buildCssLinks() {
3632                 global $wgContLang;
3633
3634                 $this->getSkin()->setupSkinUserCss( $this );
3635
3636                 // Add ResourceLoader styles
3637                 // Split the styles into these groups
3638                 $styles = array(
3639                         'other' => array(),
3640                         'user' => array(),
3641                         'site' => array(),
3642                         'private' => array(),
3643                         'noscript' => array()
3644                 );
3645                 $links = array();
3646                 $otherTags = array(); // Tags to append after the normal <link> tags
3647                 $resourceLoader = $this->getResourceLoader();
3648
3649                 $moduleStyles = $this->getModuleStyles( true, 'top' );
3650
3651                 // Per-site custom styles
3652                 $moduleStyles[] = 'site';
3653                 $moduleStyles[] = 'noscript';
3654                 $moduleStyles[] = 'user.groups';
3655
3656                 // Per-user custom styles
3657                 if ( $this->getConfig()->get( 'AllowUserCss' ) && $this->getTitle()->isCssSubpage()
3658                         && $this->userCanPreview()
3659                 ) {
3660                         // We're on a preview of a CSS subpage
3661                         // Exclude this page from the user module in case it's in there (bug 26283)
3662                         $link = $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_STYLES,
3663                                 array( 'excludepage' => $this->getTitle()->getPrefixedDBkey() )
3664                         );
3665                         $otherTags = array_merge( $otherTags, $link['html'] );
3666
3667                         // Load the previewed CSS
3668                         // If needed, Janus it first. This is user-supplied CSS, so it's
3669                         // assumed to be right for the content language directionality.
3670                         $previewedCSS = $this->getRequest()->getText( 'wpTextbox1' );
3671                         if ( $this->getLanguage()->getDir() !== $wgContLang->getDir() ) {
3672                                 $previewedCSS = CSSJanus::transform( $previewedCSS, true, false );
3673                         }
3674                         $otherTags[] = Html::inlineStyle( $previewedCSS ) . "\n";
3675                 } else {
3676                         // Load the user styles normally
3677                         $moduleStyles[] = 'user';
3678                 }
3679
3680                 // Per-user preference styles
3681                 $moduleStyles[] = 'user.cssprefs';
3682
3683                 foreach ( $moduleStyles as $name ) {
3684                         $module = $resourceLoader->getModule( $name );
3685                         if ( !$module ) {
3686                                 continue;
3687                         }
3688                         if ( $name === 'site' ) {
3689                                 // HACK: The site module shouldn't be fragmented with a cache group and
3690                                 // http request. But in order to ensure its styles are separated and after the
3691                                 // ResourceLoaderDynamicStyles marker, pretend it is in a group called 'site'.
3692                                 // The scripts remain ungrouped and rides the bottom queue.
3693                                 $styles['site'][] = $name;
3694                                 continue;
3695                         }
3696                         $group = $module->getGroup();
3697                         // Modules in groups other than the ones needing special treatment (see $styles assignment)
3698                         // will be placed in the "other" style category.
3699                         $styles[isset( $styles[$group] ) ? $group : 'other'][] = $name;
3700                 }
3701
3702                 // We want site, private and user styles to override dynamically added
3703                 // styles from modules, but we want dynamically added styles to override
3704                 // statically added styles from other modules. So the order has to be
3705                 // other, dynamic, site, private, user. Add statically added styles for
3706                 // other modules
3707                 $links[] = $this->makeResourceLoaderLink( $styles['other'], ResourceLoaderModule::TYPE_STYLES );
3708                 // Add normal styles added through addStyle()/addInlineStyle() here
3709                 $links[] = implode( "\n", $this->buildCssLinksArray() ) . $this->mInlineStyles;
3710                 // Add marker tag to mark the place where the client-side loader should inject dynamic styles
3711                 // We use a <meta> tag with a made-up name for this because that's valid HTML
3712                 $links[] = Html::element(
3713                         'meta',
3714                         array( 'name' => 'ResourceLoaderDynamicStyles', 'content' => '' )
3715                 );
3716
3717                 // Add site-specific and user-specific styles
3718                 // 'private' at present only contains user.options, so put that before 'user'
3719                 // Any future private modules will likely have a similar user-specific character
3720                 foreach ( array( 'site', 'noscript', 'private', 'user' ) as $group ) {
3721                         $links[] = $this->makeResourceLoaderLink( $styles[$group],
3722                                 ResourceLoaderModule::TYPE_STYLES
3723                         );
3724                 }
3725
3726                 // Add stuff in $otherTags (previewed user CSS if applicable)
3727                 return self::getHtmlFromLoaderLinks( $links ) . implode( '', $otherTags );
3728         }
3729
3730         /**
3731          * @return array
3732          */
3733         public function buildCssLinksArray() {
3734                 $links = array();
3735
3736                 // Add any extension CSS
3737                 foreach ( $this->mExtStyles as $url ) {
3738                         $this->addStyle( $url );
3739                 }
3740                 $this->mExtStyles = array();
3741
3742                 foreach ( $this->styles as $file => $options ) {
3743                         $link = $this->styleLink( $file, $options );
3744                         if ( $link ) {
3745                                 $links[$file] = $link;
3746                         }
3747                 }
3748                 return $links;
3749         }
3750
3751         /**
3752          * Generate \<link\> tags for stylesheets
3753          *
3754          * @param string $style URL to the file
3755          * @param array $options Option, can contain 'condition', 'dir', 'media' keys
3756          * @return string HTML fragment
3757          */
3758         protected function styleLink( $style, array $options ) {
3759                 if ( isset( $options['dir'] ) ) {
3760                         if ( $this->getLanguage()->getDir() != $options['dir'] ) {
3761                                 return '';
3762                         }
3763                 }
3764
3765                 if ( isset( $options['media'] ) ) {
3766                         $media = self::transformCssMedia( $options['media'] );
3767                         if ( is_null( $media ) ) {
3768                                 return '';
3769                         }
3770                 } else {
3771                         $media = 'all';
3772                 }
3773
3774                 if ( substr( $style, 0, 1 ) == '/' ||
3775                         substr( $style, 0, 5 ) == 'http:' ||
3776                         substr( $style, 0, 6 ) == 'https:' ) {
3777                         $url = $style;
3778                 } else {
3779                         $config = $this->getConfig();
3780                         $url = $config->get( 'StylePath' ) . '/' . $style . '?' . $config->get( 'StyleVersion' );
3781                 }
3782
3783                 $link = Html::linkedStyle( $url, $media );
3784
3785                 if ( isset( $options['condition'] ) ) {
3786                         $condition = htmlspecialchars( $options['condition'] );
3787                         $link = "<!--[if $condition]>$link<![endif]-->";
3788                 }
3789                 return $link;
3790         }
3791
3792         /**
3793          * Transform "media" attribute based on request parameters
3794          *
3795          * @param string $media Current value of the "media" attribute
3796          * @return string Modified value of the "media" attribute, or null to skip
3797          * this stylesheet
3798          */
3799         public static function transformCssMedia( $media ) {
3800                 global $wgRequest;
3801
3802                 // http://www.w3.org/TR/css3-mediaqueries/#syntax
3803                 $screenMediaQueryRegex = '/^(?:only\s+)?screen\b/i';
3804
3805                 // Switch in on-screen display for media testing
3806                 $switches = array(
3807                         'printable' => 'print',
3808                         'handheld' => 'handheld',
3809                 );
3810                 foreach ( $switches as $switch => $targetMedia ) {
3811                         if ( $wgRequest->getBool( $switch ) ) {
3812                                 if ( $media == $targetMedia ) {
3813                                         $media = '';
3814                                 } elseif ( preg_match( $screenMediaQueryRegex, $media ) === 1 ) {
3815                                         // This regex will not attempt to understand a comma-separated media_query_list
3816                                         //
3817                                         // Example supported values for $media:
3818                                         // 'screen', 'only screen', 'screen and (min-width: 982px)' ),
3819                                         // Example NOT supported value for $media:
3820                                         // '3d-glasses, screen, print and resolution > 90dpi'
3821                                         //
3822                                         // If it's a print request, we never want any kind of screen stylesheets
3823                                         // If it's a handheld request (currently the only other choice with a switch),
3824                                         // we don't want simple 'screen' but we might want screen queries that
3825                                         // have a max-width or something, so we'll pass all others on and let the
3826                                         // client do the query.
3827                                         if ( $targetMedia == 'print' || $media == 'screen' ) {
3828                                                 return null;
3829                                         }
3830                                 }
3831                         }
3832                 }
3833
3834                 return $media;
3835         }
3836
3837         /**
3838          * Add a wikitext-formatted message to the output.
3839          * This is equivalent to:
3840          *
3841          *    $wgOut->addWikiText( wfMessage( ... )->plain() )
3842          */
3843         public function addWikiMsg( /*...*/ ) {
3844                 $args = func_get_args();
3845                 $name = array_shift( $args );
3846                 $this->addWikiMsgArray( $name, $args );
3847         }
3848
3849         /**
3850          * Add a wikitext-formatted message to the output.
3851          * Like addWikiMsg() except the parameters are taken as an array
3852          * instead of a variable argument list.
3853          *
3854          * @param string $name
3855          * @param array $args
3856          */
3857         public function addWikiMsgArray( $name, $args ) {
3858                 $this->addHTML( $this->msg( $name, $args )->parseAsBlock() );
3859         }
3860
3861         /**
3862          * This function takes a number of message/argument specifications, wraps them in
3863          * some overall structure, and then parses the result and adds it to the output.
3864          *
3865          * In the $wrap, $1 is replaced with the first message, $2 with the second,
3866          * and so on. The subsequent arguments may be either
3867          * 1) strings, in which case they are message names, or
3868          * 2) arrays, in which case, within each array, the first element is the message
3869          *    name, and subsequent elements are the parameters to that message.
3870          *
3871          * Don't use this for messages that are not in the user's interface language.
3872          *
3873          * For example:
3874          *
3875          *    $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>", 'some-error' );
3876          *
3877          * Is equivalent to:
3878          *
3879          *    $wgOut->addWikiText( "<div class='error'>\n"
3880          *        . wfMessage( 'some-error' )->plain() . "\n</div>" );
3881          *
3882          * The newline after the opening div is needed in some wikitext. See bug 19226.
3883          *
3884          * @param string $wrap
3885          */
3886         public function wrapWikiMsg( $wrap /*, ...*/ ) {
3887                 $msgSpecs = func_get_args();
3888                 array_shift( $msgSpecs );
3889                 $msgSpecs = array_values( $msgSpecs );
3890                 $s = $wrap;
3891                 foreach ( $msgSpecs as $n => $spec ) {
3892                         if ( is_array( $spec ) ) {
3893                                 $args = $spec;
3894                                 $name = array_shift( $args );
3895                                 if ( isset( $args['options'] ) ) {
3896                                         unset( $args['options'] );
3897                                         wfDeprecated(
3898                                                 'Adding "options" to ' . __METHOD__ . ' is no longer supported',
3899                                                 '1.20'
3900                                         );
3901                                 }
3902                         } else {
3903                                 $args = array();
3904                                 $name = $spec;
3905                         }
3906                         $s = str_replace( '$' . ( $n + 1 ), $this->msg( $name, $args )->plain(), $s );
3907                 }
3908                 $this->addWikiText( $s );
3909         }
3910
3911         /**
3912          * Include jQuery core. Use this to avoid loading it multiple times
3913          * before we get a usable script loader.
3914          *
3915          * @param array $modules List of jQuery modules which should be loaded
3916          * @return array The list of modules which were not loaded.
3917          * @since 1.16
3918          * @deprecated since 1.17
3919          */
3920         public function includeJQuery( array $modules = array() ) {
3921                 return array();
3922         }
3923
3924         /**
3925          * Enables/disables TOC, doesn't override __NOTOC__
3926          * @param bool $flag
3927          * @since 1.22
3928          */
3929         public function enableTOC( $flag = true ) {
3930                 $this->mEnableTOC = $flag;
3931         }
3932
3933         /**
3934          * @return bool
3935          * @since 1.22
3936          */
3937         public function isTOCEnabled() {
3938                 return $this->mEnableTOC;
3939         }
3940
3941         /**
3942          * Enables/disables section edit links, doesn't override __NOEDITSECTION__
3943          * @param bool $flag
3944          * @since 1.23
3945          */
3946         public function enableSectionEditLinks( $flag = true ) {
3947                 $this->mEnableSectionEditLinks = $flag;
3948         }
3949
3950         /**
3951          * @return bool
3952          * @since 1.23
3953          */
3954         public function sectionEditLinksEnabled() {
3955                 return $this->mEnableSectionEditLinks;
3956         }
3957
3958         /**
3959          * Add ResourceLoader module styles for OOUI and set up the PHP implementation of it for use with
3960          * MediaWiki and this OutputPage instance.
3961          *
3962          * @since 1.25
3963          */
3964         public function enableOOUI() {
3965                 $themes = ExtensionRegistry::getInstance()->getAttribute( 'SkinOOUIThemes' );
3966                 // Make keys (skin names) lowercase for case-insensitive matching.
3967                 $themes = array_change_key_case( $themes, CASE_LOWER );
3968                 $skinName = strtolower( $this->getSkin()->getSkinName() );
3969                 $theme = isset( $themes[ $skinName ] ) ? $themes[ $skinName ] : 'MediaWiki';
3970                 // For example, 'OOUI\MediaWikiTheme'.
3971                 $themeClass = "OOUI\\{$theme}Theme";
3972                 OOUI\Theme::setSingleton( new $themeClass() );
3973                 OOUI\Element::setDefaultDir( $this->getLanguage()->getDir() );
3974                 $this->addModuleStyles( array(
3975                         'oojs-ui.styles',
3976                         'oojs-ui.styles.icons',
3977                         'oojs-ui.styles.indicators',
3978                         'oojs-ui.styles.textures',
3979                         'mediawiki.widgets.styles',
3980                 ) );
3981         }
3982 }