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 /**
  24  * This class should be covered by a general architecture document which does
  25  * not exist as of January 2011.  This is one of the Core classes and should
  26  * be read at least once by any new developers.
  27  *
  28  * This class is used to prepare the final rendering. A skin is then
  29  * applied to the output parameters (links, javascript, html, categories ...).
  30  *
  31  * @todo FIXME: Another class handles sending the whole page to the client.
  32  *
  33  * Some comments comes from a pairing session between Zak Greant and Antoine Musso
  34  * in November 2010.
  35  *
  36  * @todo document
  37  */
  38 class OutputPage extends ContextSource {
  39         /** @var array Should be private. Used with addMeta() which adds "<meta>" */
  40         protected $mMetatags = array();
  41
  42         /** @var array */
  43         protected $mLinktags = array();
  44
  45         /** @var bool */
  46         protected $mCanonicalUrl = false;
  47
  48         /**
  49          * @var array Additional stylesheets. Looks like this is for extensions.
  50          *   Might be replaced by resource loader.
  51          */
  52         protected $mExtStyles = array();
  53
  54         /**
  55          * @var string Should be private - has getter and setter. Contains
  56          *   the HTML title */
  57         public $mPagetitle = '';
  58
  59         /**
  60          * @var string Contains all of the "<body>" content. Should be private we
  61          *   got set/get accessors and the append() method.
  62          */
  63         public $mBodytext = '';
  64
  65         /**
  66          * Holds the debug lines that will be output as comments in page source if
  67          * $wgDebugComments is enabled. See also $wgShowDebug.
  68          * @deprecated since 1.20; use MWDebug class instead.
  69          */
  70         public $mDebugtext = '';
  71
  72         /** @var string Stores contents of "<title>" tag */
  73         private $mHTMLtitle = '';
  74
  75         /**
  76          * @var bool Is the displayed content related to the source of the
  77          *   corresponding wiki article.
  78          */
  79         private $mIsarticle = false;
  80
  81         /** @var bool Stores "article flag" toggle. */
  82         private $mIsArticleRelated = true;
  83
  84         /**
  85          * @var bool We have to set isPrintable(). Some pages should
  86          * never be printed (ex: redirections).
  87          */
  88         private $mPrintable = false;
  89
  90         /**
  91          * @var array Contains the page subtitle. Special pages usually have some
  92          *   links here. Don't confuse with site subtitle added by skins.
  93          */
  94         private $mSubtitle = array();
  95
  96         /** @var string */
  97         public $mRedirect = '';
  98
  99         /** @var int */
 100         protected $mStatusCode;
 101
 102         /**
 103          * @var string Variable mLastModified and mEtag are used for sending cache control.
 104          *   The whole caching system should probably be moved into its own class.
 105          */
 106         protected $mLastModified = '';
 107
 108         /**
 109          * Contains an HTTP Entity Tags (see RFC 2616 section 3.13) which is used
 110          * as a unique identifier for the content. It is later used by the client
 111          * to compare its cached version with the server version. Client sends
 112          * headers If-Match and If-None-Match containing its locally cached ETAG value.
 113          *
 114          * To get more information, you will have to look at HTTP/1.1 protocol which
 115          * is properly described in RFC 2616 : http://tools.ietf.org/html/rfc2616
 116          */
 117         private $mETag = false;
 118
 119         /** @var array */
 120         protected $mCategoryLinks = array();
 121
 122         /** @var array */
 123         protected $mCategories = array();
 124
 125         /** @var array Array of Interwiki Prefixed (non DB key) Titles (e.g. 'fr:Test page') */
 126         private $mLanguageLinks = array();
 127
 128         /**
 129          * Used for JavaScript (pre resource loader)
 130          * @todo We should split JS / CSS.
 131          * mScripts content is inserted as is in "<head>" by Skin. This might
 132          * contain either a link to a stylesheet or inline CSS.
 133          */
 134         private $mScripts = '';
 135
 136         /** @var string Inline CSS styles. Use addInlineStyle() sparingly */
 137         protected $mInlineStyles = '';
 138
 139         /** @todo Unused? */
 140         private $mLinkColours;
 141
 142         /**
 143          * @var string Used by skin template.
 144          * Example: $tpl->set( 'displaytitle', $out->mPageLinkTitle );
 145          */
 146         public $mPageLinkTitle = '';
 147
 148         /** @var array Array of elements in "<head>". Parser might add its own headers! */
 149         protected $mHeadItems = array();
 150
 151         // @todo FIXME: Next 5 variables probably come from the resource loader
 152
 153         /** @var array */
 154         protected $mModules = array();
 155
 156         /** @var array */
 157         protected $mModuleScripts = array();
 158
 159         /** @var array */
 160         protected $mModuleStyles = array();
 161
 162         /** @var array */
 163         protected $mModuleMessages = array();
 164
 165         /** @var ResourceLoader */
 166         protected $mResourceLoader;
 167
 168         /** @var array */
 169         protected $mJsConfigVars = array();
 170
 171         /** @var array */
 172         protected $mTemplateIds = array();
 173
 174         /** @var array */
 175         protected $mImageTimeKeys = array();
 176
 177         /** @var string */
 178         public $mRedirectCode = '';
 179
 180         protected $mFeedLinksAppendQuery = null;
 181
 182         /** @var array
 183          * What level of 'untrustworthiness' is allowed in CSS/JS modules loaded on this page?
 184          * @see ResourceLoaderModule::$origin
 185          * ResourceLoaderModule::ORIGIN_ALL is assumed unless overridden;
 186          */
 187         protected $mAllowedModules = array(
 188                 ResourceLoaderModule::TYPE_COMBINED => ResourceLoaderModule::ORIGIN_ALL,
 189         );
 190
 191         /** @var bool Whether output is disabled.  If this is true, the 'output' method will do nothing. */
 192         protected $mDoNothing = false;
 193
 194         // Parser related.
 195
 196         /**
 197          * @var int
 198          * @todo Unused?
 199          */
 200         private $mContainsOldMagic = 0;
 201
 202         /** @var int */
 203         protected $mContainsNewMagic = 0;
 204
 205         /**
 206          * lazy initialised, use parserOptions()
 207          * @var ParserOptions
 208          */
 209         protected $mParserOptions = null;
 210
 211         /**
 212          * Handles the Atom / RSS links.
 213          * We probably only support Atom in 2011.
 214          * @see $wgAdvertisedFeedTypes
 215          */
 216         private $mFeedLinks = array();
 217
 218         // Gwicke work on squid caching? Roughly from 2003.
 219         protected $mEnableClientCache = true;
 220
 221         /** @var bool Flag if output should only contain the body of the article. */
 222         private $mArticleBodyOnly = false;
 223
 224         /** @var bool */
 225         protected $mNewSectionLink = false;
 226
 227         /** @var bool */
 228         protected $mHideNewSectionLink = false;
 229
 230         /**
 231          * @var bool Comes from the parser. This was probably made to load CSS/JS
 232          * only if we had "<gallery>". Used directly in CategoryPage.php.
 233          * Looks like resource loader can replace this.
 234          */
 235         public $mNoGallery = false;
 236
 237         /** @var string */
 238         private $mPageTitleActionText = '';
 239
 240         /** @var array */
 241         private $mParseWarnings = array();
 242
 243         /** @var int Cache stuff. Looks like mEnableClientCache */
 244         protected $mSquidMaxage = 0;
 245
 246         /**
 247          * @var bool
 248          * @todo Document
 249          */
 250         protected $mPreventClickjacking = true;
 251
 252         /** @var int To include the variable {{REVISIONID}} */
 253         private $mRevisionId = null;
 254
 255         /** @var string */
 256         private $mRevisionTimestamp = null;
 257
 258         /** @var array */
 259         protected $mFileVersion = null;
 260
 261         /**
 262          * @var array An array of stylesheet filenames (relative from skins path),
 263          * with options for CSS media, IE conditions, and RTL/LTR direction.
 264          * For internal use; add settings in the skin via $this->addStyle()
 265          *
 266          * Style again! This seems like a code duplication since we already have
 267          * mStyles. This is what makes Open Source amazing.
 268          */
 269         protected $styles = array();
 270
 271         /**
 272          * Whether jQuery is already handled.
 273          */
 274         protected $mJQueryDone = false;
 275
 276         private $mIndexPolicy = 'index';
 277         private $mFollowPolicy = 'follow';
 278         private $mVaryHeader = array(
 279                 'Accept-Encoding' => array( 'list-contains=gzip' ),
 280         );
 281
 282         /**
 283          * If the current page was reached through a redirect, $mRedirectedFrom contains the Title
 284          * of the redirect.
 285          *
 286          * @var Title
 287          */
 288         private $mRedirectedFrom = null;
 289
 290         /**
 291          * Additional key => value data
 292          */
 293         private $mProperties = array();
 294
 295         /**
 296          * @var string|null ResourceLoader target for load.php links. If null, will be omitted
 297          */
 298         private $mTarget = null;
 299
 300         /**
 301          * @var bool Whether parser output should contain table of contents
 302          */
 303         private $mEnableTOC = true;
 304
 305         /**
 306          * @var bool Whether parser output should contain section edit links
 307          */
 308         private $mEnableSectionEditLinks = true;
 309
 310         /**
 311          * Constructor for OutputPage. This should not be called directly.
 312          * Instead a new RequestContext should be created and it will implicitly create
 313          * a OutputPage tied to that context.
 314          * @param IContextSource|null $context
 315          */
 316         function __construct( IContextSource $context = null ) {
 317                 if ( $context === null ) {
 318                         # Extensions should use `new RequestContext` instead of `new OutputPage` now.
 319                         wfDeprecated( __METHOD__, '1.18' );
 320                 } else {
 321                         $this->setContext( $context );
 322                 }
 323         }
 324
 325         /**
 326          * Redirect to $url rather than displaying the normal page
 327          *
 328          * @param string $url URL
 329          * @param string $responsecode HTTP status code
 330          */
 331         public function redirect( $url, $responsecode = '302' ) {
 332                 # Strip newlines as a paranoia check for header injection in PHP<5.1.2
 333                 $this->mRedirect = str_replace( "\n", '', $url );
 334                 $this->mRedirectCode = $responsecode;
 335         }
 336
 337         /**
 338          * Get the URL to redirect to, or an empty string if not redirect URL set
 339          *
 340          * @return string
 341          */
 342         public function getRedirect() {
 343                 return $this->mRedirect;
 344         }
 345
 346         /**
 347          * Set the HTTP status code to send with the output.
 348          *
 349          * @param int $statusCode
 350          */
 351         public function setStatusCode( $statusCode ) {
 352                 $this->mStatusCode = $statusCode;
 353         }
 354
 355         /**
 356          * Add a new "<meta>" tag
 357          * To add an http-equiv meta tag, precede the name with "http:"
 358          *
 359          * @param string $name Tag name
 360          * @param string $val Tag value
 361          */
 362         function addMeta( $name, $val ) {
 363                 array_push( $this->mMetatags, array( $name, $val ) );
 364         }
 365
 366         /**
 367          * Add a new \<link\> tag to the page header.
 368          *
 369          * Note: use setCanonicalUrl() for rel=canonical.
 370          *
 371          * @param array $linkarr Associative array of attributes.
 372          */
 373         function addLink( array $linkarr ) {
 374                 array_push( $this->mLinktags, $linkarr );
 375         }
 376
 377         /**
 378          * Add a new \<link\> with "rel" attribute set to "meta"
 379          *
 380          * @param array $linkarr Associative array mapping attribute names to their
 381          *                 values, both keys and values will be escaped, and the
 382          *                 "rel" attribute will be automatically added
 383          */
 384         function addMetadataLink( array $linkarr ) {
 385                 $linkarr['rel'] = $this->getMetadataAttribute();
 386                 $this->addLink( $linkarr );
 387         }
 388
 389         /**
 390          * Set the URL to be used for the <link rel=canonical>. This should be used
 391          * in preference to addLink(), to avoid duplicate link tags.
 392          * @param string $url
 393          */
 394         function setCanonicalUrl( $url ) {
 395                 $this->mCanonicalUrl = $url;
 396         }
 397
 398         /**
 399          * Get the value of the "rel" attribute for metadata links
 400          *
 401          * @return string
 402          */
 403         public function getMetadataAttribute() {
 404                 # note: buggy CC software only reads first "meta" link
 405                 static $haveMeta = false;
 406                 if ( $haveMeta ) {
 407                         return 'alternate meta';
 408                 } else {
 409                         $haveMeta = true;
 410                         return 'meta';
 411                 }
 412         }
 413
 414         /**
 415          * Add raw HTML to the list of scripts (including \<script\> tag, etc.)
 416          *
 417          * @param string $script Raw HTML
 418          */
 419         function addScript( $script ) {
 420                 $this->mScripts .= $script . "\n";
 421         }
 422
 423         /**
 424          * Register and add a stylesheet from an extension directory.
 425          *
 426          * @param string $url Path to sheet.  Provide either a full url (beginning
 427          *             with 'http', etc) or a relative path from the document root
 428          *             (beginning with '/').  Otherwise it behaves identically to
 429          *             addStyle() and draws from the /skins folder.
 430          */
 431         public function addExtensionStyle( $url ) {
 432                 array_push( $this->mExtStyles, $url );
 433         }
 434
 435         /**
 436          * Get all styles added by extensions
 437          *
 438          * @return array
 439          */
 440         function getExtStyle() {
 441                 return $this->mExtStyles;
 442         }
 443
 444         /**
 445          * Add a JavaScript file out of skins/common, or a given relative path.
 446          *
 447          * @param string $file Filename in skins/common or complete on-server path
 448          *              (/foo/bar.js)
 449          * @param string $version Style version of the file. Defaults to $wgStyleVersion
 450          */
 451         public function addScriptFile( $file, $version = null ) {
 452                 global $wgStylePath, $wgStyleVersion;
 453                 // See if $file parameter is an absolute URL or begins with a slash
 454                 if ( substr( $file, 0, 1 ) == '/' || preg_match( '#^[a-z]*://#i', $file ) ) {
 455                         $path = $file;
 456                 } else {
 457                         $path = "{$wgStylePath}/common/{$file}";
 458                 }
 459                 if ( is_null( $version ) ) {
 460                         $version = $wgStyleVersion;
 461                 }
 462                 $this->addScript( Html::linkedScript( wfAppendQuery( $path, $version ) ) );
 463         }
 464
 465         /**
 466          * Add a self-contained script tag with the given contents
 467          *
 468          * @param string $script JavaScript text, no "<script>" tags
 469          */
 470         public function addInlineScript( $script ) {
 471                 $this->mScripts .= Html::inlineScript( "\n$script\n" ) . "\n";
 472         }
 473
 474         /**
 475          * Get all registered JS and CSS tags for the header.
 476          *
 477          * @return string
 478          * @deprecated since 1.24 Use OutputPage::headElement to build the full header.
 479          */
 480         function getScript() {
 481                 wfDeprecated( __METHOD__, '1.24' );
 482                 return $this->mScripts . $this->getHeadItems();
 483         }
 484
 485         /**
 486          * Filter an array of modules to remove insufficiently trustworthy members, and modules
 487          * which are no longer registered (eg a page is cached before an extension is disabled)
 488          * @param array $modules
 489          * @param string|null $position If not null, only return modules with this position
 490          * @param string $type
 491          * @return array
 492          */
 493         protected function filterModules( array $modules, $position = null,
 494                 $type = ResourceLoaderModule::TYPE_COMBINED
 495         ) {
 496                 $resourceLoader = $this->getResourceLoader();
 497                 $filteredModules = array();
 498                 foreach ( $modules as $val ) {
 499                         $module = $resourceLoader->getModule( $val );
 500                         if ( $module instanceof ResourceLoaderModule
 501                                 && $module->getOrigin() <= $this->getAllowedModules( $type )
 502                                 && ( is_null( $position ) || $module->getPosition() == $position )
 503                                 && ( !$this->mTarget || in_array( $this->mTarget, $module->getTargets() ) )
 504                         ) {
 505                                 $filteredModules[] = $val;
 506                         }
 507                 }
 508                 return $filteredModules;
 509         }
 510
 511         /**
 512          * Get the list of modules to include on this page
 513          *
 514          * @param bool $filter Whether to filter out insufficiently trustworthy modules
 515          * @param string|null $position If not null, only return modules with this position
 516          * @param string $param
 517          * @return array Array of module names
 518          */
 519         public function getModules( $filter = false, $position = null, $param = 'mModules' ) {
 520                 $modules = array_values( array_unique( $this->$param ) );
 521                 return $filter
 522                         ? $this->filterModules( $modules, $position )
 523                         : $modules;
 524         }
 525
 526         /**
 527          * Add one or more modules recognized by the resource loader. Modules added
 528          * through this function will be loaded by the resource loader when the
 529          * page loads.
 530          *
 531          * @param string|array $modules Module name (string) or array of module names
 532          */
 533         public function addModules( $modules ) {
 534                 $this->mModules = array_merge( $this->mModules, (array)$modules );
 535         }
 536
 537         /**
 538          * Get the list of module JS to include on this page
 539          *
 540          * @param bool $filter
 541          * @param string|null $position
 542          *
 543          * @return array Array of module names
 544          */
 545         public function getModuleScripts( $filter = false, $position = null ) {
 546                 return $this->getModules( $filter, $position, 'mModuleScripts' );
 547         }
 548
 549         /**
 550          * Add only JS of one or more modules recognized by the resource loader. Module
 551          * scripts added through this function will be loaded by the resource loader when
 552          * the page loads.
 553          *
 554          * @param string|array $modules Module name (string) or array of module names
 555          */
 556         public function addModuleScripts( $modules ) {
 557                 $this->mModuleScripts = array_merge( $this->mModuleScripts, (array)$modules );
 558         }
 559
 560         /**
 561          * Get the list of module CSS to include on this page
 562          *
 563          * @param bool $filter
 564          * @param string|null $position
 565          *
 566          * @return array Array of module names
 567          */
 568         public function getModuleStyles( $filter = false, $position = null ) {
 569                 return $this->getModules( $filter, $position, 'mModuleStyles' );
 570         }
 571
 572         /**
 573          * Add only CSS of one or more modules recognized by the resource loader.
 574          *
 575          * Module styles added through this function will be added using standard link CSS
 576          * tags, rather than as a combined Javascript and CSS package. Thus, they will
 577          * load when JavaScript is disabled (unless CSS also happens to be disabled).
 578          *
 579          * @param string|array $modules Module name (string) or array of module names
 580          */
 581         public function addModuleStyles( $modules ) {
 582                 $this->mModuleStyles = array_merge( $this->mModuleStyles, (array)$modules );
 583         }
 584
 585         /**
 586          * Get the list of module messages to include on this page
 587          *
 588          * @param bool $filter
 589          * @param string|null $position
 590          *
 591          * @return array Array of module names
 592          */
 593         public function getModuleMessages( $filter = false, $position = null ) {
 594                 return $this->getModules( $filter, $position, 'mModuleMessages' );
 595         }
 596
 597         /**
 598          * Add only messages of one or more modules recognized by the resource loader.
 599          * Module messages added through this function will be loaded by the resource
 600          * loader when the page loads.
 601          *
 602          * @param string|array $modules Module name (string) or array of module names
 603          */
 604         public function addModuleMessages( $modules ) {
 605                 $this->mModuleMessages = array_merge( $this->mModuleMessages, (array)$modules );
 606         }
 607
 608         /**
 609          * @return null|string ResourceLoader target
 610          */
 611         public function getTarget() {
 612                 return $this->mTarget;
 613         }
 614
 615         /**
 616          * Sets ResourceLoader target for load.php links. If null, will be omitted
 617          *
 618          * @param string|null $target
 619          */
 620         public function setTarget( $target ) {
 621                 $this->mTarget = $target;
 622         }
 623
 624         /**
 625          * Get an array of head items
 626          *
 627          * @return array
 628          */
 629         function getHeadItemsArray() {
 630                 return $this->mHeadItems;
 631         }
 632
 633         /**
 634          * Get all header items in a string
 635          *
 636          * @return string
 637          * @deprecated since 1.24 Use OutputPage::headElement or
 638          *   if absolutely necessary use OutputPage::getHeadItemsArray
 639          */
 640         function getHeadItems() {
 641                 wfDeprecated( __METHOD__, '1.24' );
 642                 $s = '';
 643                 foreach ( $this->mHeadItems as $item ) {
 644                         $s .= $item;
 645                 }
 646                 return $s;
 647         }
 648
 649         /**
 650          * Add or replace an header item to the output
 651          *
 652          * @param string $name Item name
 653          * @param string $value Raw HTML
 654          */
 655         public function addHeadItem( $name, $value ) {
 656                 $this->mHeadItems[$name] = $value;
 657         }
 658
 659         /**
 660          * Check if the header item $name is already set
 661          *
 662          * @param string $name Item name
 663          * @return bool
 664          */
 665         public function hasHeadItem( $name ) {
 666                 return isset( $this->mHeadItems[$name] );
 667         }
 668
 669         /**
 670          * Set the value of the ETag HTTP header, only used if $wgUseETag is true
 671          *
 672          * @param string $tag Value of "ETag" header
 673          */
 674         function setETag( $tag ) {
 675                 $this->mETag = $tag;
 676         }
 677
 678         /**
 679          * Set whether the output should only contain the body of the article,
 680          * without any skin, sidebar, etc.
 681          * Used e.g. when calling with "action=render".
 682          *
 683          * @param bool $only Whether to output only the body of the article
 684          */
 685         public function setArticleBodyOnly( $only ) {
 686                 $this->mArticleBodyOnly = $only;
 687         }
 688
 689         /**
 690          * Return whether the output will contain only the body of the article
 691          *
 692          * @return bool
 693          */
 694         public function getArticleBodyOnly() {
 695                 return $this->mArticleBodyOnly;
 696         }
 697
 698         /**
 699          * Set an additional output property
 700          * @since 1.21
 701          *
 702          * @param string $name
 703          * @param mixed $value
 704          */
 705         public function setProperty( $name, $value ) {
 706                 $this->mProperties[$name] = $value;
 707         }
 708
 709         /**
 710          * Get an additional output property
 711          * @since 1.21
 712          *
 713          * @param string $name
 714          * @return mixed Property value or null if not found
 715          */
 716         public function getProperty( $name ) {
 717                 if ( isset( $this->mProperties[$name] ) ) {
 718                         return $this->mProperties[$name];
 719                 } else {
 720                         return null;
 721                 }
 722         }
 723
 724         /**
 725          * checkLastModified tells the client to use the client-cached page if
 726          * possible. If successful, the OutputPage is disabled so that
 727          * any future call to OutputPage->output() have no effect.
 728          *
 729          * Side effect: sets mLastModified for Last-Modified header
 730          *
 731          * @param string $timestamp
 732          *
 733          * @return bool True if cache-ok headers was sent.
 734          */
 735         public function checkLastModified( $timestamp ) {
 736                 global $wgCachePages, $wgCacheEpoch, $wgUseSquid, $wgSquidMaxage;
 737
 738                 if ( !$timestamp || $timestamp == '19700101000000' ) {
 739                         wfDebug( __METHOD__ . ": CACHE DISABLED, NO TIMESTAMP\n" );
 740                         return false;
 741                 }
 742                 if ( !$wgCachePages ) {
 743                         wfDebug( __METHOD__ . ": CACHE DISABLED\n" );
 744                         return false;
 745                 }
 746
 747                 $timestamp = wfTimestamp( TS_MW, $timestamp );
 748                 $modifiedTimes = array(
 749                         'page' => $timestamp,
 750                         'user' => $this->getUser()->getTouched(),
 751                         'epoch' => $wgCacheEpoch
 752                 );
 753                 if ( $wgUseSquid ) {
 754                         // bug 44570: the core page itself may not change, but resources might
 755                         $modifiedTimes['sepoch'] = wfTimestamp( TS_MW, time() - $wgSquidMaxage );
 756                 }
 757                 wfRunHooks( 'OutputPageCheckLastModified', array( &$modifiedTimes ) );
 758
 759                 $maxModified = max( $modifiedTimes );
 760                 $this->mLastModified = wfTimestamp( TS_RFC2822, $maxModified );
 761
 762                 $clientHeader = $this->getRequest()->getHeader( 'If-Modified-Since' );
 763                 if ( $clientHeader === false ) {
 764                         wfDebug( __METHOD__ . ": client did not send If-Modified-Since header\n", 'log' );
 765                         return false;
 766                 }
 767
 768                 # IE sends sizes after the date like this:
 769                 # Wed, 20 Aug 2003 06:51:19 GMT; length=5202
 770                 # this breaks strtotime().
 771                 $clientHeader = preg_replace( '/;.*$/', '', $clientHeader );
 772
 773                 wfSuppressWarnings(); // E_STRICT system time bitching
 774                 $clientHeaderTime = strtotime( $clientHeader );
 775                 wfRestoreWarnings();
 776                 if ( !$clientHeaderTime ) {
 777                         wfDebug( __METHOD__
 778                                 . ": unable to parse the client's If-Modified-Since header: $clientHeader\n" );
 779                         return false;
 780                 }
 781                 $clientHeaderTime = wfTimestamp( TS_MW, $clientHeaderTime );
 782
 783                 # Make debug info
 784                 $info = '';
 785                 foreach ( $modifiedTimes as $name => $value ) {
 786                         if ( $info !== '' ) {
 787                                 $info .= ', ';
 788                         }
 789                         $info .= "$name=" . wfTimestamp( TS_ISO_8601, $value );
 790                 }
 791
 792                 wfDebug( __METHOD__ . ": client sent If-Modified-Since: " .
 793                         wfTimestamp( TS_ISO_8601, $clientHeaderTime ) . "\n", 'log' );
 794                 wfDebug( __METHOD__ . ": effective Last-Modified: " .
 795                         wfTimestamp( TS_ISO_8601, $maxModified ) . "\n", 'log' );
 796                 if ( $clientHeaderTime < $maxModified ) {
 797                         wfDebug( __METHOD__ . ": STALE, $info\n", 'log' );
 798                         return false;
 799                 }
 800
 801                 # Not modified
 802                 # Give a 304 response code and disable body output
 803                 wfDebug( __METHOD__ . ": NOT MODIFIED, $info\n", 'log' );
 804                 ini_set( 'zlib.output_compression', 0 );
 805                 $this->getRequest()->response()->header( "HTTP/1.1 304 Not Modified" );
 806                 $this->sendCacheControl();
 807                 $this->disable();
 808
 809                 // Don't output a compressed blob when using ob_gzhandler;
 810                 // it's technically against HTTP spec and seems to confuse
 811                 // Firefox when the response gets split over two packets.
 812                 wfClearOutputBuffers();
 813
 814                 return true;
 815         }
 816
 817         /**
 818          * Override the last modified timestamp
 819          *
 820          * @param string $timestamp New timestamp, in a format readable by
 821          *        wfTimestamp()
 822          */
 823         public function setLastModified( $timestamp ) {
 824                 $this->mLastModified = wfTimestamp( TS_RFC2822, $timestamp );
 825         }
 826
 827         /**
 828          * Set the robot policy for the page: <http://www.robotstxt.org/meta.html>
 829          *
 830          * @param string $policy The literal string to output as the contents of
 831          *   the meta tag.  Will be parsed according to the spec and output in
 832          *   standardized form.
 833          * @return null
 834          */
 835         public function setRobotPolicy( $policy ) {
 836                 $policy = Article::formatRobotPolicy( $policy );
 837
 838                 if ( isset( $policy['index'] ) ) {
 839                         $this->setIndexPolicy( $policy['index'] );
 840                 }
 841                 if ( isset( $policy['follow'] ) ) {
 842                         $this->setFollowPolicy( $policy['follow'] );
 843                 }
 844         }
 845
 846         /**
 847          * Set the index policy for the page, but leave the follow policy un-
 848          * touched.
 849          *
 850          * @param string $policy Either 'index' or 'noindex'.
 851          * @return null
 852          */
 853         public function setIndexPolicy( $policy ) {
 854                 $policy = trim( $policy );
 855                 if ( in_array( $policy, array( 'index', 'noindex' ) ) ) {
 856                         $this->mIndexPolicy = $policy;
 857                 }
 858         }
 859
 860         /**
 861          * Set the follow policy for the page, but leave the index policy un-
 862          * touched.
 863          *
 864          * @param string $policy Either 'follow' or 'nofollow'.
 865          * @return null
 866          */
 867         public function setFollowPolicy( $policy ) {
 868                 $policy = trim( $policy );
 869                 if ( in_array( $policy, array( 'follow', 'nofollow' ) ) ) {
 870                         $this->mFollowPolicy = $policy;
 871                 }
 872         }
 873
 874         /**
 875          * Set the new value of the "action text", this will be added to the
 876          * "HTML title", separated from it with " - ".
 877          *
 878          * @param string $text New value of the "action text"
 879          */
 880         public function setPageTitleActionText( $text ) {
 881                 $this->mPageTitleActionText = $text;
 882         }
 883
 884         /**
 885          * Get the value of the "action text"
 886          *
 887          * @return string
 888          */
 889         public function getPageTitleActionText() {
 890                 return $this->mPageTitleActionText;
 891         }
 892
 893         /**
 894          * "HTML title" means the contents of "<title>".
 895          * It is stored as plain, unescaped text and will be run through htmlspecialchars in the skin file.
 896          *
 897          * @param string|Message $name
 898          */
 899         public function setHTMLTitle( $name ) {
 900                 if ( $name instanceof Message ) {
 901                         $this->mHTMLtitle = $name->setContext( $this->getContext() )->text();
 902                 } else {
 903                         $this->mHTMLtitle = $name;
 904                 }
 905         }
 906
 907         /**
 908          * Return the "HTML title", i.e. the content of the "<title>" tag.
 909          *
 910          * @return string
 911          */
 912         public function getHTMLTitle() {
 913                 return $this->mHTMLtitle;
 914         }
 915
 916         /**
 917          * Set $mRedirectedFrom, the Title of the page which redirected us to the current page.
 918          *
 919          * @param Title $t
 920          */
 921         public function setRedirectedFrom( $t ) {
 922                 $this->mRedirectedFrom = $t;
 923         }
 924
 925         /**
 926          * "Page title" means the contents of \<h1\>. It is stored as a valid HTML
 927          * fragment. This function allows good tags like \<sup\> in the \<h1\> tag,
 928          * but not bad tags like \<script\>. This function automatically sets
 929          * \<title\> to the same content as \<h1\> but with all tags removed. Bad
 930          * tags that were escaped in \<h1\> will still be escaped in \<title\>, and
 931          * good tags like \<i\> will be dropped entirely.
 932          *
 933          * @param string|Message $name
 934          */
 935         public function setPageTitle( $name ) {
 936                 if ( $name instanceof Message ) {
 937                         $name = $name->setContext( $this->getContext() )->text();
 938                 }
 939
 940                 # change "<script>foo&bar</script>" to "&lt;script&gt;foo&amp;bar&lt;/script&gt;"
 941                 # but leave "<i>foobar</i>" alone
 942                 $nameWithTags = Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags( $name ) );
 943                 $this->mPagetitle = $nameWithTags;
 944
 945                 # change "<i>foo&amp;bar</i>" to "foo&bar"
 946                 $this->setHTMLTitle(
 947                         $this->msg( 'pagetitle' )->rawParams( Sanitizer::stripAllTags( $nameWithTags ) )
 948                                 ->inContentLanguage()
 949                 );
 950         }
 951
 952         /**
 953          * Return the "page title", i.e. the content of the \<h1\> tag.
 954          *
 955          * @return string
 956          */
 957         public function getPageTitle() {
 958                 return $this->mPagetitle;
 959         }
 960
 961         /**
 962          * Set the Title object to use
 963          *
 964          * @param Title $t
 965          */
 966         public function setTitle( Title $t ) {
 967                 $this->getContext()->setTitle( $t );
 968         }
 969
 970         /**
 971          * Replace the subtitle with $str
 972          *
 973          * @param string|Message $str New value of the subtitle. String should be safe HTML.
 974          */
 975         public function setSubtitle( $str ) {
 976                 $this->clearSubtitle();
 977                 $this->addSubtitle( $str );
 978         }
 979
 980         /**
 981          * Add $str to the subtitle
 982          *
 983          * @deprecated since 1.19; use addSubtitle() instead
 984          * @param string|Message $str String or Message to add to the subtitle
 985          */
 986         public function appendSubtitle( $str ) {
 987                 $this->addSubtitle( $str );
 988         }
 989
 990         /**
 991          * Add $str to the subtitle
 992          *
 993          * @param string|Message $str String or Message to add to the subtitle. String should be safe HTML.
 994          */
 995         public function addSubtitle( $str ) {
 996                 if ( $str instanceof Message ) {
 997                         $this->mSubtitle[] = $str->setContext( $this->getContext() )->parse();
 998                 } else {
 999                         $this->mSubtitle[] = $str;
1000                 }
1001         }
1002
1003         /**
1004          * Add a subtitle containing a backlink to a page
1005          *
1006          * @param Title $title Title to link to
1007          * @param array $query Array of additional parameters to include in the link
1008          */
1009         public function addBacklinkSubtitle( Title $title, $query = array() ) {
1010                 if ( $title->isRedirect() ) {
1011                         $query['redirect'] = 'no';
1012                 }
1013                 $this->addSubtitle( $this->msg( 'backlinksubtitle' )
1014                         ->rawParams( Linker::link( $title, null, array(), $query ) ) );
1015         }
1016
1017         /**
1018          * Clear the subtitles
1019          */
1020         public function clearSubtitle() {
1021                 $this->mSubtitle = array();
1022         }
1023
1024         /**
1025          * Get the subtitle
1026          *
1027          * @return string
1028          */
1029         public function getSubtitle() {
1030                 return implode( "<br />\n\t\t\t\t", $this->mSubtitle );
1031         }
1032
1033         /**
1034          * Set the page as printable, i.e. it'll be displayed with with all
1035          * print styles included
1036          */
1037         public function setPrintable() {
1038                 $this->mPrintable = true;
1039         }
1040
1041         /**
1042          * Return whether the page is "printable"
1043          *
1044          * @return bool
1045          */
1046         public function isPrintable() {
1047                 return $this->mPrintable;
1048         }
1049
1050         /**
1051          * Disable output completely, i.e. calling output() will have no effect
1052          */
1053         public function disable() {
1054                 $this->mDoNothing = true;
1055         }
1056
1057         /**
1058          * Return whether the output will be completely disabled
1059          *
1060          * @return bool
1061          */
1062         public function isDisabled() {
1063                 return $this->mDoNothing;
1064         }
1065
1066         /**
1067          * Show an "add new section" link?
1068          *
1069          * @return bool
1070          */
1071         public function showNewSectionLink() {
1072                 return $this->mNewSectionLink;
1073         }
1074
1075         /**
1076          * Forcibly hide the new section link?
1077          *
1078          * @return bool
1079          */
1080         public function forceHideNewSectionLink() {
1081                 return $this->mHideNewSectionLink;
1082         }
1083
1084         /**
1085          * Add or remove feed links in the page header
1086          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
1087          * for the new version
1088          * @see addFeedLink()
1089          *
1090          * @param bool $show True: add default feeds, false: remove all feeds
1091          */
1092         public function setSyndicated( $show = true ) {
1093                 if ( $show ) {
1094                         $this->setFeedAppendQuery( false );
1095                 } else {
1096                         $this->mFeedLinks = array();
1097                 }
1098         }
1099
1100         /**
1101          * Add default feeds to the page header
1102          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
1103          * for the new version
1104          * @see addFeedLink()
1105          *
1106          * @param string $val Query to append to feed links or false to output
1107          *        default links
1108          */
1109         public function setFeedAppendQuery( $val ) {
1110                 global $wgAdvertisedFeedTypes;
1111
1112                 $this->mFeedLinks = array();
1113
1114                 foreach ( $wgAdvertisedFeedTypes as $type ) {
1115                         $query = "feed=$type";
1116                         if ( is_string( $val ) ) {
1117                                 $query .= '&' . $val;
1118                         }
1119                         $this->mFeedLinks[$type] = $this->getTitle()->getLocalURL( $query );
1120                 }
1121         }
1122
1123         /**
1124          * Add a feed link to the page header
1125          *
1126          * @param string $format Feed type, should be a key of $wgFeedClasses
1127          * @param string $href URL
1128          */
1129         public function addFeedLink( $format, $href ) {
1130                 global $wgAdvertisedFeedTypes;
1131
1132                 if ( in_array( $format, $wgAdvertisedFeedTypes ) ) {
1133                         $this->mFeedLinks[$format] = $href;
1134                 }
1135         }
1136
1137         /**
1138          * Should we output feed links for this page?
1139          * @return bool
1140          */
1141         public function isSyndicated() {
1142                 return count( $this->mFeedLinks ) > 0;
1143         }
1144
1145         /**
1146          * Return URLs for each supported syndication format for this page.
1147          * @return array Associating format keys with URLs
1148          */
1149         public function getSyndicationLinks() {
1150                 return $this->mFeedLinks;
1151         }
1152
1153         /**
1154          * Will currently always return null
1155          *
1156          * @return null
1157          */
1158         public function getFeedAppendQuery() {
1159                 return $this->mFeedLinksAppendQuery;
1160         }
1161
1162         /**
1163          * Set whether the displayed content is related to the source of the
1164          * corresponding article on the wiki
1165          * Setting true will cause the change "article related" toggle to true
1166          *
1167          * @param bool $v
1168          */
1169         public function setArticleFlag( $v ) {
1170                 $this->mIsarticle = $v;
1171                 if ( $v ) {
1172                         $this->mIsArticleRelated = $v;
1173                 }
1174         }
1175
1176         /**
1177          * Return whether the content displayed page is related to the source of
1178          * the corresponding article on the wiki
1179          *
1180          * @return bool
1181          */
1182         public function isArticle() {
1183                 return $this->mIsarticle;
1184         }
1185
1186         /**
1187          * Set whether this page is related an article on the wiki
1188          * Setting false will cause the change of "article flag" toggle to false
1189          *
1190          * @param bool $v
1191          */
1192         public function setArticleRelated( $v ) {
1193                 $this->mIsArticleRelated = $v;
1194                 if ( !$v ) {
1195                         $this->mIsarticle = false;
1196                 }
1197         }
1198
1199         /**
1200          * Return whether this page is related an article on the wiki
1201          *
1202          * @return bool
1203          */
1204         public function isArticleRelated() {
1205                 return $this->mIsArticleRelated;
1206         }
1207
1208         /**
1209          * Add new language links
1210          *
1211          * @param array $newLinkArray Associative array mapping language code to the page
1212          *                      name
1213          */
1214         public function addLanguageLinks( array $newLinkArray ) {
1215                 $this->mLanguageLinks += $newLinkArray;
1216         }
1217
1218         /**
1219          * Reset the language links and add new language links
1220          *
1221          * @param array $newLinkArray Associative array mapping language code to the page
1222          *                      name
1223          */
1224         public function setLanguageLinks( array $newLinkArray ) {
1225                 $this->mLanguageLinks = $newLinkArray;
1226         }
1227
1228         /**
1229          * Get the list of language links
1230          *
1231          * @return array Array of Interwiki Prefixed (non DB key) Titles (e.g. 'fr:Test page')
1232          */
1233         public function getLanguageLinks() {
1234                 return $this->mLanguageLinks;
1235         }
1236
1237         /**
1238          * Add an array of categories, with names in the keys
1239          *
1240          * @param array $categories Mapping category name => sort key
1241          */
1242         public function addCategoryLinks( array $categories ) {
1243                 global $wgContLang, $wgContentHandlerUseDB;
1244
1245                 if ( !is_array( $categories ) || count( $categories ) == 0 ) {
1246                         return;
1247                 }
1248
1249                 # Add the links to a LinkBatch
1250                 $arr = array( NS_CATEGORY => $categories );
1251                 $lb = new LinkBatch;
1252                 $lb->setArray( $arr );
1253
1254                 # Fetch existence plus the hiddencat property
1255                 $dbr = wfGetDB( DB_SLAVE );
1256                 $fields = array( 'page_id', 'page_namespace', 'page_title', 'page_len',
1257                         'page_is_redirect', 'page_latest', 'pp_value' );
1258
1259                 if ( $wgContentHandlerUseDB ) {
1260                         $fields[] = 'page_content_model';
1261                 }
1262
1263                 $res = $dbr->select( array( 'page', 'page_props' ),
1264                         $fields,
1265                         $lb->constructSet( 'page', $dbr ),
1266                         __METHOD__,
1267                         array(),
1268                         array( 'page_props' => array( 'LEFT JOIN', array(
1269                                 'pp_propname' => 'hiddencat',
1270                                 'pp_page = page_id'
1271                         ) ) )
1272                 );
1273
1274                 # Add the results to the link cache
1275                 $lb->addResultToCache( LinkCache::singleton(), $res );
1276
1277                 # Set all the values to 'normal'.
1278                 $categories = array_fill_keys( array_keys( $categories ), 'normal' );
1279
1280                 # Mark hidden categories
1281                 foreach ( $res as $row ) {
1282                         if ( isset( $row->pp_value ) ) {
1283                                 $categories[$row->page_title] = 'hidden';
1284                         }
1285                 }
1286
1287                 # Add the remaining categories to the skin
1288                 if ( wfRunHooks(
1289                         'OutputPageMakeCategoryLinks',
1290                         array( &$this, $categories, &$this->mCategoryLinks ) )
1291                 ) {
1292                         foreach ( $categories as $category => $type ) {
1293                                 $origcategory = $category;
1294                                 $title = Title::makeTitleSafe( NS_CATEGORY, $category );
1295                                 if ( !$title ) {
1296                                         continue;
1297                                 }
1298                                 $wgContLang->findVariantLink( $category, $title, true );
1299                                 if ( $category != $origcategory && array_key_exists( $category, $categories ) ) {
1300                                         continue;
1301                                 }
1302                                 $text = $wgContLang->convertHtml( $title->getText() );
1303                                 $this->mCategories[] = $title->getText();
1304                                 $this->mCategoryLinks[$type][] = Linker::link( $title, $text );
1305                         }
1306                 }
1307         }
1308
1309         /**
1310          * Reset the category links (but not the category list) and add $categories
1311          *
1312          * @param array $categories Mapping category name => sort key
1313          */
1314         public function setCategoryLinks( array $categories ) {
1315                 $this->mCategoryLinks = array();
1316                 $this->addCategoryLinks( $categories );
1317         }
1318
1319         /**
1320          * Get the list of category links, in a 2-D array with the following format:
1321          * $arr[$type][] = $link, where $type is either "normal" or "hidden" (for
1322          * hidden categories) and $link a HTML fragment with a link to the category
1323          * page
1324          *
1325          * @return array
1326          */
1327         public function getCategoryLinks() {
1328                 return $this->mCategoryLinks;
1329         }
1330
1331         /**
1332          * Get the list of category names this page belongs to
1333          *
1334          * @return array Array of strings
1335          */
1336         public function getCategories() {
1337                 return $this->mCategories;
1338         }
1339
1340         /**
1341          * Do not allow scripts which can be modified by wiki users to load on this page;
1342          * only allow scripts bundled with, or generated by, the software.
1343          */
1344         public function disallowUserJs() {
1345                 $this->reduceAllowedModules(
1346                         ResourceLoaderModule::TYPE_SCRIPTS,
1347                         ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL
1348                 );
1349         }
1350
1351         /**
1352          * Show what level of JavaScript / CSS untrustworthiness is allowed on this page
1353          * @see ResourceLoaderModule::$origin
1354          * @param string $type ResourceLoaderModule TYPE_ constant
1355          * @return int ResourceLoaderModule ORIGIN_ class constant
1356          */
1357         public function getAllowedModules( $type ) {
1358                 if ( $type == ResourceLoaderModule::TYPE_COMBINED ) {
1359                         return min( array_values( $this->mAllowedModules ) );
1360                 } else {
1361                         return isset( $this->mAllowedModules[$type] )
1362                                 ? $this->mAllowedModules[$type]
1363                                 : ResourceLoaderModule::ORIGIN_ALL;
1364                 }
1365         }
1366
1367         /**
1368          * Set the highest level of CSS/JS untrustworthiness allowed
1369          * @param string $type ResourceLoaderModule TYPE_ constant
1370          * @param int $level ResourceLoaderModule class constant
1371          */
1372         public function setAllowedModules( $type, $level ) {
1373                 $this->mAllowedModules[$type] = $level;
1374         }
1375
1376         /**
1377          * As for setAllowedModules(), but don't inadvertently make the page more accessible
1378          * @param string $type
1379          * @param int $level ResourceLoaderModule class constant
1380          */
1381         public function reduceAllowedModules( $type, $level ) {
1382                 $this->mAllowedModules[$type] = min( $this->getAllowedModules( $type ), $level );
1383         }
1384
1385         /**
1386          * Prepend $text to the body HTML
1387          *
1388          * @param string $text HTML
1389          */
1390         public function prependHTML( $text ) {
1391                 $this->mBodytext = $text . $this->mBodytext;
1392         }
1393
1394         /**
1395          * Append $text to the body HTML
1396          *
1397          * @param string $text HTML
1398          */
1399         public function addHTML( $text ) {
1400                 $this->mBodytext .= $text;
1401         }
1402
1403         /**
1404          * Shortcut for adding an Html::element via addHTML.
1405          *
1406          * @since 1.19
1407          *
1408          * @param string $element
1409          * @param array $attribs
1410          * @param string $contents
1411          */
1412         public function addElement( $element, array $attribs = array(), $contents = '' ) {
1413                 $this->addHTML( Html::element( $element, $attribs, $contents ) );
1414         }
1415
1416         /**
1417          * Clear the body HTML
1418          */
1419         public function clearHTML() {
1420                 $this->mBodytext = '';
1421         }
1422
1423         /**
1424          * Get the body HTML
1425          *
1426          * @return string HTML
1427          */
1428         public function getHTML() {
1429                 return $this->mBodytext;
1430         }
1431
1432         /**
1433          * Get/set the ParserOptions object to use for wikitext parsing
1434          *
1435          * @param ParserOptions|null $options Either the ParserOption to use or null to only get the
1436          *   current ParserOption object
1437          * @return ParserOptions
1438          */
1439         public function parserOptions( $options = null ) {
1440                 if ( !$this->mParserOptions ) {
1441                         $this->mParserOptions = ParserOptions::newFromContext( $this->getContext() );
1442                         $this->mParserOptions->setEditSection( false );
1443                 }
1444                 return wfSetVar( $this->mParserOptions, $options );
1445         }
1446
1447         /**
1448          * Set the revision ID which will be seen by the wiki text parser
1449          * for things such as embedded {{REVISIONID}} variable use.
1450          *
1451          * @param int|null $revid An positive integer, or null
1452          * @return mixed Previous value
1453          */
1454         public function setRevisionId( $revid ) {
1455                 $val = is_null( $revid ) ? null : intval( $revid );
1456                 return wfSetVar( $this->mRevisionId, $val );
1457         }
1458
1459         /**
1460          * Get the displayed revision ID
1461          *
1462          * @return int
1463          */
1464         public function getRevisionId() {
1465                 return $this->mRevisionId;
1466         }
1467
1468         /**
1469          * Set the timestamp of the revision which will be displayed. This is used
1470          * to avoid a extra DB call in Skin::lastModified().
1471          *
1472          * @param string|null $timestamp
1473          * @return mixed Previous value
1474          */
1475         public function setRevisionTimestamp( $timestamp ) {
1476                 return wfSetVar( $this->mRevisionTimestamp, $timestamp );
1477         }
1478
1479         /**
1480          * Get the timestamp of displayed revision.
1481          * This will be null if not filled by setRevisionTimestamp().
1482          *
1483          * @return string|null
1484          */
1485         public function getRevisionTimestamp() {
1486                 return $this->mRevisionTimestamp;
1487         }
1488
1489         /**
1490          * Set the displayed file version
1491          *
1492          * @param File|bool $file
1493          * @return mixed Previous value
1494          */
1495         public function setFileVersion( $file ) {
1496                 $val = null;
1497                 if ( $file instanceof File && $file->exists() ) {
1498                         $val = array( 'time' => $file->getTimestamp(), 'sha1' => $file->getSha1() );
1499                 }
1500                 return wfSetVar( $this->mFileVersion, $val, true );
1501         }
1502
1503         /**
1504          * Get the displayed file version
1505          *
1506          * @return array|null ('time' => MW timestamp, 'sha1' => sha1)
1507          */
1508         public function getFileVersion() {
1509                 return $this->mFileVersion;
1510         }
1511
1512         /**
1513          * Get the templates used on this page
1514          *
1515          * @return array (namespace => dbKey => revId)
1516          * @since 1.18
1517          */
1518         public function getTemplateIds() {
1519                 return $this->mTemplateIds;
1520         }
1521
1522         /**
1523          * Get the files used on this page
1524          *
1525          * @return array (dbKey => array('time' => MW timestamp or null, 'sha1' => sha1 or ''))
1526          * @since 1.18
1527          */
1528         public function getFileSearchOptions() {
1529                 return $this->mImageTimeKeys;
1530         }
1531
1532         /**
1533          * Convert wikitext to HTML and add it to the buffer
1534          * Default assumes that the current page title will be used.
1535          *
1536          * @param string $text
1537          * @param bool $linestart Is this the start of a line?
1538          * @param bool $interface Is this text in the user interface language?
1539          */
1540         public function addWikiText( $text, $linestart = true, $interface = true ) {
1541                 $title = $this->getTitle(); // Work around E_STRICT
1542                 if ( !$title ) {
1543                         throw new MWException( 'Title is null' );
1544                 }
1545                 $this->addWikiTextTitle( $text, $title, $linestart, /*tidy*/false, $interface );
1546         }
1547
1548         /**
1549          * Add wikitext with a custom Title object
1550          *
1551          * @param string $text Wikitext
1552          * @param Title $title
1553          * @param bool $linestart Is this the start of a line?
1554          */
1555         public function addWikiTextWithTitle( $text, &$title, $linestart = true ) {
1556                 $this->addWikiTextTitle( $text, $title, $linestart );
1557         }
1558
1559         /**
1560          * Add wikitext with a custom Title object and tidy enabled.
1561          *
1562          * @param string $text Wikitext
1563          * @param Title $title
1564          * @param bool $linestart Is this the start of a line?
1565          */
1566         function addWikiTextTitleTidy( $text, &$title, $linestart = true ) {
1567                 $this->addWikiTextTitle( $text, $title, $linestart, true );
1568         }
1569
1570         /**
1571          * Add wikitext with tidy enabled
1572          *
1573          * @param string $text Wikitext
1574          * @param bool $linestart Is this the start of a line?
1575          */
1576         public function addWikiTextTidy( $text, $linestart = true ) {
1577                 $title = $this->getTitle();
1578                 $this->addWikiTextTitleTidy( $text, $title, $linestart );
1579         }
1580
1581         /**
1582          * Add wikitext with a custom Title object
1583          *
1584          * @param string $text Wikitext
1585          * @param Title $title
1586          * @param bool $linestart Is this the start of a line?
1587          * @param bool $tidy Whether to use tidy
1588          * @param bool $interface Whether it is an interface message
1589          *   (for example disables conversion)
1590          */
1591         public function addWikiTextTitle( $text, Title $title, $linestart,
1592                 $tidy = false, $interface = false
1593         ) {
1594                 global $wgParser;
1595
1596                 wfProfileIn( __METHOD__ );
1597
1598                 $popts = $this->parserOptions();
1599                 $oldTidy = $popts->setTidy( $tidy );
1600                 $popts->setInterfaceMessage( (bool)$interface );
1601
1602                 $parserOutput = $wgParser->getFreshParser()->parse(
1603                         $text, $title, $popts,
1604                         $linestart, true, $this->mRevisionId
1605                 );
1606
1607                 $popts->setTidy( $oldTidy );
1608
1609                 $this->addParserOutput( $parserOutput );
1610
1611                 wfProfileOut( __METHOD__ );
1612         }
1613
1614         /**
1615          * Add a ParserOutput object, but without Html.
1616          *
1617          * @deprecated since 1.24, use addParserOutputMetadata() instead.
1618          * @param ParserOutput $parserOutput
1619          */
1620         public function addParserOutputNoText( &$parserOutput ) {
1621                 $this->addParserOutputMetadata( $parserOutput );
1622         }
1623
1624         /**
1625          * Add all metadata associated with a ParserOutput object, but without the actual HTML. This
1626          * includes categories, language links, ResourceLoader modules, effects of certain magic words,
1627          * and so on.
1628          *
1629          * @since 1.24
1630          * @param ParserOutput $parserOutput
1631          */
1632         public function addParserOutputMetadata( &$parserOutput ) {
1633                 $this->mLanguageLinks += $parserOutput->getLanguageLinks();
1634                 $this->addCategoryLinks( $parserOutput->getCategories() );
1635                 $this->mNewSectionLink = $parserOutput->getNewSection();
1636                 $this->mHideNewSectionLink = $parserOutput->getHideNewSection();
1637
1638                 $this->mParseWarnings = $parserOutput->getWarnings();
1639                 if ( !$parserOutput->isCacheable() ) {
1640                         $this->enableClientCache( false );
1641                 }
1642                 $this->mNoGallery = $parserOutput->getNoGallery();
1643                 $this->mHeadItems = array_merge( $this->mHeadItems, $parserOutput->getHeadItems() );
1644                 $this->addModules( $parserOutput->getModules() );
1645                 $this->addModuleScripts( $parserOutput->getModuleScripts() );
1646                 $this->addModuleStyles( $parserOutput->getModuleStyles() );
1647                 $this->addModuleMessages( $parserOutput->getModuleMessages() );
1648                 $this->addJsConfigVars( $parserOutput->getJsConfigVars() );
1649                 $this->mPreventClickjacking = $this->mPreventClickjacking
1650                         || $parserOutput->preventClickjacking();
1651
1652                 // Template versioning...
1653                 foreach ( (array)$parserOutput->getTemplateIds() as $ns => $dbks ) {
1654                         if ( isset( $this->mTemplateIds[$ns] ) ) {
1655                                 $this->mTemplateIds[$ns] = $dbks + $this->mTemplateIds[$ns];
1656                         } else {
1657                                 $this->mTemplateIds[$ns] = $dbks;
1658                         }
1659                 }
1660                 // File versioning...
1661                 foreach ( (array)$parserOutput->getFileSearchOptions() as $dbk => $data ) {
1662                         $this->mImageTimeKeys[$dbk] = $data;
1663                 }
1664
1665                 // Hooks registered in the object
1666                 global $wgParserOutputHooks;
1667                 foreach ( $parserOutput->getOutputHooks() as $hookInfo ) {
1668                         list( $hookName, $data ) = $hookInfo;
1669                         if ( isset( $wgParserOutputHooks[$hookName] ) ) {
1670                                 call_user_func( $wgParserOutputHooks[$hookName], $this, $parserOutput, $data );
1671                         }
1672                 }
1673
1674                 // Link flags are ignored for now, but may in the future be
1675                 // used to mark individual language links.
1676                 $linkFlags = array();
1677                 wfRunHooks( 'LanguageLinks', array( $this->getTitle(), &$this->mLanguageLinks, &$linkFlags ) );
1678                 wfRunHooks( 'OutputPageParserOutput', array( &$this, $parserOutput ) );
1679         }
1680
1681         /**
1682          * Add the HTML and enhancements for it (like ResourceLoader modules) associated with a
1683          * ParserOutput object, without any other metadata.
1684          *
1685          * @since 1.24
1686          * @param ParserOutput $parserOutput
1687          */
1688         public function addParserOutputContent( &$parserOutput ) {
1689                 $this->addParserOutputText( $parserOutput );
1690
1691                 $this->addModules( $parserOutput->getModules() );
1692                 $this->addModuleScripts( $parserOutput->getModuleScripts() );
1693                 $this->addModuleStyles( $parserOutput->getModuleStyles() );
1694                 $this->addModuleMessages( $parserOutput->getModuleMessages() );
1695
1696                 $this->addJsConfigVars( $parserOutput->getJsConfigVars() );
1697         }
1698
1699         /**
1700          * Add the HTML associated with a ParserOutput object, without any metadata.
1701          *
1702          * @since 1.24
1703          * @param ParserOutput $parserOutput
1704          */
1705         public function addParserOutputText( &$parserOutput ) {
1706                 $text = $parserOutput->getText();
1707                 wfRunHooks( 'OutputPageBeforeHTML', array( &$this, &$text ) );
1708                 $this->addHTML( $text );
1709         }
1710
1711         /**
1712          * Add everything from a ParserOutput object.
1713          *
1714          * @param ParserOutput $parserOutput
1715          */
1716         function addParserOutput( &$parserOutput ) {
1717                 $this->addParserOutputMetadata( $parserOutput );
1718                 $parserOutput->setTOCEnabled( $this->mEnableTOC );
1719
1720                 // Touch section edit links only if not previously disabled
1721                 if ( $parserOutput->getEditSectionTokens() ) {
1722                         $parserOutput->setEditSectionTokens( $this->mEnableSectionEditLinks );
1723                 }
1724
1725                 $this->addParserOutputText( $parserOutput );
1726         }
1727
1728         /**
1729          * Add the output of a QuickTemplate to the output buffer
1730          *
1731          * @param QuickTemplate $template
1732          */
1733         public function addTemplate( &$template ) {
1734                 $this->addHTML( $template->getHTML() );
1735         }
1736
1737         /**
1738          * Parse wikitext and return the HTML.
1739          *
1740          * @param string $text
1741          * @param bool $linestart Is this the start of a line?
1742          * @param bool $interface Use interface language ($wgLang instead of
1743          *   $wgContLang) while parsing language sensitive magic words like GRAMMAR and PLURAL.
1744          *   This also disables LanguageConverter.
1745          * @param Language $language Target language object, will override $interface
1746          * @throws MWException
1747          * @return string HTML
1748          */
1749         public function parse( $text, $linestart = true, $interface = false, $language = null ) {
1750                 global $wgParser;
1751
1752                 if ( is_null( $this->getTitle() ) ) {
1753                         throw new MWException( 'Empty $mTitle in ' . __METHOD__ );
1754                 }
1755
1756                 $popts = $this->parserOptions();
1757                 if ( $interface ) {
1758                         $popts->setInterfaceMessage( true );
1759                 }
1760                 if ( $language !== null ) {
1761                         $oldLang = $popts->setTargetLanguage( $language );
1762                 }
1763
1764                 $parserOutput = $wgParser->getFreshParser()->parse(
1765                         $text, $this->getTitle(), $popts,
1766                         $linestart, true, $this->mRevisionId
1767                 );
1768
1769                 if ( $interface ) {
1770                         $popts->setInterfaceMessage( false );
1771                 }
1772                 if ( $language !== null ) {
1773                         $popts->setTargetLanguage( $oldLang );
1774                 }
1775
1776                 return $parserOutput->getText();
1777         }
1778
1779         /**
1780          * Parse wikitext, strip paragraphs, and return the HTML.
1781          *
1782          * @param string $text
1783          * @param bool $linestart Is this the start of a line?
1784          * @param bool $interface Use interface language ($wgLang instead of
1785          *   $wgContLang) while parsing language sensitive magic
1786          *   words like GRAMMAR and PLURAL
1787          * @return string HTML
1788          */
1789         public function parseInline( $text, $linestart = true, $interface = false ) {
1790                 $parsed = $this->parse( $text, $linestart, $interface );
1791                 return Parser::stripOuterParagraph( $parsed );
1792         }
1793
1794         /**
1795          * Set the value of the "s-maxage" part of the "Cache-control" HTTP header
1796          *
1797          * @param int $maxage Maximum cache time on the Squid, in seconds.
1798          */
1799         public function setSquidMaxage( $maxage ) {
1800                 $this->mSquidMaxage = $maxage;
1801         }
1802
1803         /**
1804          * Use enableClientCache(false) to force it to send nocache headers
1805          *
1806          * @param bool $state
1807          *
1808          * @return bool
1809          */
1810         public function enableClientCache( $state ) {
1811                 return wfSetVar( $this->mEnableClientCache, $state );
1812         }
1813
1814         /**
1815          * Get the list of cookies that will influence on the cache
1816          *
1817          * @return array
1818          */
1819         function getCacheVaryCookies() {
1820                 global $wgCookiePrefix, $wgCacheVaryCookies;
1821                 static $cookies;
1822                 if ( $cookies === null ) {
1823                         $cookies = array_merge(
1824                                 array(
1825                                         "{$wgCookiePrefix}Token",
1826                                         "{$wgCookiePrefix}LoggedOut",
1827                                         "forceHTTPS",
1828                                         session_name()
1829                                 ),
1830                                 $wgCacheVaryCookies
1831                         );
1832                         wfRunHooks( 'GetCacheVaryCookies', array( $this, &$cookies ) );
1833                 }
1834                 return $cookies;
1835         }
1836
1837         /**
1838          * Check if the request has a cache-varying cookie header
1839          * If it does, it's very important that we don't allow public caching
1840          *
1841          * @return bool
1842          */
1843         function haveCacheVaryCookies() {
1844                 $cookieHeader = $this->getRequest()->getHeader( 'cookie' );
1845                 if ( $cookieHeader === false ) {
1846                         return false;
1847                 }
1848                 $cvCookies = $this->getCacheVaryCookies();
1849                 foreach ( $cvCookies as $cookieName ) {
1850                         # Check for a simple string match, like the way squid does it
1851                         if ( strpos( $cookieHeader, $cookieName ) !== false ) {
1852                                 wfDebug( __METHOD__ . ": found $cookieName\n" );
1853                                 return true;
1854                         }
1855                 }
1856                 wfDebug( __METHOD__ . ": no cache-varying cookies found\n" );
1857                 return false;
1858         }
1859
1860         /**
1861          * Add an HTTP header that will influence on the cache
1862          *
1863          * @param string $header Header name
1864          * @param array|null $option
1865          * @todo FIXME: Document the $option parameter; it appears to be for
1866          *        X-Vary-Options but what format is acceptable?
1867          */
1868         public function addVaryHeader( $header, $option = null ) {
1869                 if ( !array_key_exists( $header, $this->mVaryHeader ) ) {
1870                         $this->mVaryHeader[$header] = (array)$option;
1871                 } elseif ( is_array( $option ) ) {
1872                         if ( is_array( $this->mVaryHeader[$header] ) ) {
1873                                 $this->mVaryHeader[$header] = array_merge( $this->mVaryHeader[$header], $option );
1874                         } else {
1875                                 $this->mVaryHeader[$header] = $option;
1876                         }
1877                 }
1878                 $this->mVaryHeader[$header] = array_unique( (array)$this->mVaryHeader[$header] );
1879         }
1880
1881         /**
1882          * Return a Vary: header on which to vary caches. Based on the keys of $mVaryHeader,
1883          * such as Accept-Encoding or Cookie
1884          *
1885          * @return string
1886          */
1887         public function getVaryHeader() {
1888                 return 'Vary: ' . join( ', ', array_keys( $this->mVaryHeader ) );
1889         }
1890
1891         /**
1892          * Get a complete X-Vary-Options header
1893          *
1894          * @return string
1895          */
1896         public function getXVO() {
1897                 $cvCookies = $this->getCacheVaryCookies();
1898
1899                 $cookiesOption = array();
1900                 foreach ( $cvCookies as $cookieName ) {
1901                         $cookiesOption[] = 'string-contains=' . $cookieName;
1902                 }
1903                 $this->addVaryHeader( 'Cookie', $cookiesOption );
1904
1905                 $headers = array();
1906                 foreach ( $this->mVaryHeader as $header => $option ) {
1907                         $newheader = $header;
1908                         if ( is_array( $option ) && count( $option ) > 0 ) {
1909                                 $newheader .= ';' . implode( ';', $option );
1910                         }
1911                         $headers[] = $newheader;
1912                 }
1913                 $xvo = 'X-Vary-Options: ' . implode( ',', $headers );
1914
1915                 return $xvo;
1916         }
1917
1918         /**
1919          * bug 21672: Add Accept-Language to Vary and XVO headers
1920          * if there's no 'variant' parameter existed in GET.
1921          *
1922          * For example:
1923          *   /w/index.php?title=Main_page should always be served; but
1924          *   /w/index.php?title=Main_page&variant=zh-cn should never be served.
1925          */
1926         function addAcceptLanguage() {
1927                 $title = $this->getTitle();
1928                 if ( !$title instanceof Title ) {
1929                         return;
1930                 }
1931
1932                 $lang = $title->getPageLanguage();
1933                 if ( !$this->getRequest()->getCheck( 'variant' ) && $lang->hasVariants() ) {
1934                         $variants = $lang->getVariants();
1935                         $aloption = array();
1936                         foreach ( $variants as $variant ) {
1937                                 if ( $variant === $lang->getCode() ) {
1938                                         continue;
1939                                 } else {
1940                                         $aloption[] = 'string-contains=' . $variant;
1941
1942                                         // IE and some other browsers use BCP 47 standards in
1943                                         // their Accept-Language header, like "zh-CN" or "zh-Hant".
1944                                         // We should handle these too.
1945                                         $variantBCP47 = wfBCP47( $variant );
1946                                         if ( $variantBCP47 !== $variant ) {
1947                                                 $aloption[] = 'string-contains=' . $variantBCP47;
1948                                         }
1949                                 }
1950                         }
1951                         $this->addVaryHeader( 'Accept-Language', $aloption );
1952                 }
1953         }
1954
1955         /**
1956          * Set a flag which will cause an X-Frame-Options header appropriate for
1957          * edit pages to be sent. The header value is controlled by
1958          * $wgEditPageFrameOptions.
1959          *
1960          * This is the default for special pages. If you display a CSRF-protected
1961          * form on an ordinary view page, then you need to call this function.
1962          *
1963          * @param bool $enable
1964          */
1965         public function preventClickjacking( $enable = true ) {
1966                 $this->mPreventClickjacking = $enable;
1967         }
1968
1969         /**
1970          * Turn off frame-breaking. Alias for $this->preventClickjacking(false).
1971          * This can be called from pages which do not contain any CSRF-protected
1972          * HTML form.
1973          */
1974         public function allowClickjacking() {
1975                 $this->mPreventClickjacking = false;
1976         }
1977
1978         /**
1979          * Get the prevent-clickjacking flag
1980          *
1981          * @since 1.24
1982          * @return bool
1983          */
1984         public function getPreventClickjacking() {
1985                 return $this->mPreventClickjacking;
1986         }
1987
1988         /**
1989          * Get the X-Frame-Options header value (without the name part), or false
1990          * if there isn't one. This is used by Skin to determine whether to enable
1991          * JavaScript frame-breaking, for clients that don't support X-Frame-Options.
1992          *
1993          * @return string
1994          */
1995         public function getFrameOptions() {
1996                 global $wgBreakFrames, $wgEditPageFrameOptions;
1997                 if ( $wgBreakFrames ) {
1998                         return 'DENY';
1999                 } elseif ( $this->mPreventClickjacking && $wgEditPageFrameOptions ) {
2000                         return $wgEditPageFrameOptions;
2001                 }
2002                 return false;
2003         }
2004
2005         /**
2006          * Send cache control HTTP headers
2007          */
2008         public function sendCacheControl() {
2009                 global $wgUseSquid, $wgUseESI, $wgUseETag, $wgSquidMaxage, $wgUseXVO;
2010
2011                 $response = $this->getRequest()->response();
2012                 if ( $wgUseETag && $this->mETag ) {
2013                         $response->header( "ETag: $this->mETag" );
2014                 }
2015
2016                 $this->addVaryHeader( 'Cookie' );
2017                 $this->addAcceptLanguage();
2018
2019                 # don't serve compressed data to clients who can't handle it
2020                 # maintain different caches for logged-in users and non-logged in ones
2021                 $response->header( $this->getVaryHeader() );
2022
2023                 if ( $wgUseXVO ) {
2024                         # Add an X-Vary-Options header for Squid with Wikimedia patches
2025                         $response->header( $this->getXVO() );
2026                 }
2027
2028                 if ( $this->mEnableClientCache ) {
2029                         if (
2030                                 $wgUseSquid && session_id() == '' && !$this->isPrintable() &&
2031                                 $this->mSquidMaxage != 0 && !$this->haveCacheVaryCookies()
2032                         ) {
2033                                 if ( $wgUseESI ) {
2034                                         # We'll purge the proxy cache explicitly, but require end user agents
2035                                         # to revalidate against the proxy on each visit.
2036                                         # Surrogate-Control controls our Squid, Cache-Control downstream caches
2037                                         wfDebug( __METHOD__ . ": proxy caching with ESI; {$this->mLastModified} **\n", 'log' );
2038                                         # start with a shorter timeout for initial testing
2039                                         # header( 'Surrogate-Control: max-age=2678400+2678400, content="ESI/1.0"');
2040                                         $response->header( 'Surrogate-Control: max-age=' . $wgSquidMaxage
2041                                                 . '+' . $this->mSquidMaxage . ', content="ESI/1.0"' );
2042                                         $response->header( 'Cache-Control: s-maxage=0, must-revalidate, max-age=0' );
2043                                 } else {
2044                                         # We'll purge the proxy cache for anons explicitly, but require end user agents
2045                                         # to revalidate against the proxy on each visit.
2046                                         # IMPORTANT! The Squid needs to replace the Cache-Control header with
2047                                         # Cache-Control: s-maxage=0, must-revalidate, max-age=0
2048                                         wfDebug( __METHOD__ . ": local proxy caching; {$this->mLastModified} **\n", 'log' );
2049                                         # start with a shorter timeout for initial testing
2050                                         # header( "Cache-Control: s-maxage=2678400, must-revalidate, max-age=0" );
2051                                         $response->header( 'Cache-Control: s-maxage=' . $this->mSquidMaxage
2052                                                 . ', must-revalidate, max-age=0' );
2053                                 }
2054                         } else {
2055                                 # We do want clients to cache if they can, but they *must* check for updates
2056                                 # on revisiting the page.
2057                                 wfDebug( __METHOD__ . ": private caching; {$this->mLastModified} **\n", 'log' );
2058                                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
2059                                 $response->header( "Cache-Control: private, must-revalidate, max-age=0" );
2060                         }
2061                         if ( $this->mLastModified ) {
2062                                 $response->header( "Last-Modified: {$this->mLastModified}" );
2063                         }
2064                 } else {
2065                         wfDebug( __METHOD__ . ": no caching **\n", 'log' );
2066
2067                         # In general, the absence of a last modified header should be enough to prevent
2068                         # the client from using its cache. We send a few other things just to make sure.
2069                         $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
2070                         $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
2071                         $response->header( 'Pragma: no-cache' );
2072                 }
2073         }
2074
2075         /**
2076          * Finally, all the text has been munged and accumulated into
2077          * the object, let's actually output it:
2078          */
2079         public function output() {
2080                 global $wgLanguageCode, $wgDebugRedirects, $wgMimeType, $wgVaryOnXFP,
2081                         $wgResponsiveImages;
2082
2083                 if ( $this->mDoNothing ) {
2084                         return;
2085                 }
2086
2087                 wfProfileIn( __METHOD__ );
2088
2089                 $response = $this->getRequest()->response();
2090
2091                 if ( $this->mRedirect != '' ) {
2092                         # Standards require redirect URLs to be absolute
2093                         $this->mRedirect = wfExpandUrl( $this->mRedirect, PROTO_CURRENT );
2094
2095                         $redirect = $this->mRedirect;
2096                         $code = $this->mRedirectCode;
2097
2098                         if ( wfRunHooks( "BeforePageRedirect", array( $this, &$redirect, &$code ) ) ) {
2099                                 if ( $code == '301' || $code == '303' ) {
2100                                         if ( !$wgDebugRedirects ) {
2101                                                 $message = HttpStatus::getMessage( $code );
2102                                                 $response->header( "HTTP/1.1 $code $message" );
2103                                         }
2104                                         $this->mLastModified = wfTimestamp( TS_RFC2822 );
2105                                 }
2106                                 if ( $wgVaryOnXFP ) {
2107                                         $this->addVaryHeader( 'X-Forwarded-Proto' );
2108                                 }
2109                                 $this->sendCacheControl();
2110
2111                                 $response->header( "Content-Type: text/html; charset=utf-8" );
2112                                 if ( $wgDebugRedirects ) {
2113                                         $url = htmlspecialchars( $redirect );
2114                                         print "<html>\n<head>\n<title>Redirect</title>\n</head>\n<body>\n";
2115                                         print "<p>Location: <a href=\"$url\">$url</a></p>\n";
2116                                         print "</body>\n</html>\n";
2117                                 } else {
2118                                         $response->header( 'Location: ' . $redirect );
2119                                 }
2120                         }
2121
2122                         wfProfileOut( __METHOD__ );
2123                         return;
2124                 } elseif ( $this->mStatusCode ) {
2125                         $message = HttpStatus::getMessage( $this->mStatusCode );
2126                         if ( $message ) {
2127                                 $response->header( 'HTTP/1.1 ' . $this->mStatusCode . ' ' . $message );
2128                         }
2129                 }
2130
2131                 # Buffer output; final headers may depend on later processing
2132                 ob_start();
2133
2134                 $response->header( "Content-type: $wgMimeType; charset=UTF-8" );
2135                 $response->header( 'Content-language: ' . $wgLanguageCode );
2136
2137                 // Avoid Internet Explorer "compatibility view" in IE 8-10, so that
2138                 // jQuery etc. can work correctly.
2139                 $response->header( 'X-UA-Compatible: IE=Edge' );
2140
2141                 // Prevent framing, if requested
2142                 $frameOptions = $this->getFrameOptions();
2143                 if ( $frameOptions ) {
2144                         $response->header( "X-Frame-Options: $frameOptions" );
2145                 }
2146
2147                 if ( $this->mArticleBodyOnly ) {
2148                         echo $this->mBodytext;
2149                 } else {
2150
2151                         $sk = $this->getSkin();
2152                         // add skin specific modules
2153                         $modules = $sk->getDefaultModules();
2154
2155                         // enforce various default modules for all skins
2156                         $coreModules = array(
2157                                 // keep this list as small as possible
2158                                 'mediawiki.page.startup',
2159                                 'mediawiki.user',
2160                         );
2161
2162                         // Support for high-density display images if enabled
2163                         if ( $wgResponsiveImages ) {
2164                                 $coreModules[] = 'mediawiki.hidpi';
2165                         }
2166
2167                         $this->addModules( $coreModules );
2168                         foreach ( $modules as $group ) {
2169                                 $this->addModules( $group );
2170                         }
2171                         MWDebug::addModules( $this );
2172
2173                         // Hook that allows last minute changes to the output page, e.g.
2174                         // adding of CSS or Javascript by extensions.
2175                         wfRunHooks( 'BeforePageDisplay', array( &$this, &$sk ) );
2176
2177                         wfProfileIn( 'Output-skin' );
2178                         $sk->outputPage();
2179                         wfProfileOut( 'Output-skin' );
2180                 }
2181
2182                 // This hook allows last minute changes to final overall output by modifying output buffer
2183                 wfRunHooks( 'AfterFinalPageOutput', array( $this ) );
2184
2185                 $this->sendCacheControl();
2186
2187                 ob_end_flush();
2188
2189                 wfProfileOut( __METHOD__ );
2190         }
2191
2192         /**
2193          * Actually output something with print.
2194          *
2195          * @param string $ins The string to output
2196          * @deprecated since 1.22 Use echo yourself.
2197          */
2198         public function out( $ins ) {
2199                 wfDeprecated( __METHOD__, '1.22' );
2200                 print $ins;
2201         }
2202
2203         /**
2204          * Produce a "user is blocked" page.
2205          * @deprecated since 1.18
2206          */
2207         function blockedPage() {
2208                 throw new UserBlockedError( $this->getUser()->mBlock );
2209         }
2210
2211         /**
2212          * Prepare this object to display an error page; disable caching and
2213          * indexing, clear the current text and redirect, set the page's title
2214          * and optionally an custom HTML title (content of the "<title>" tag).
2215          *
2216          * @param string|Message $pageTitle Will be passed directly to setPageTitle()
2217          * @param string|Message $htmlTitle Will be passed directly to setHTMLTitle();
2218          *                   optional, if not passed the "<title>" attribute will be
2219          *                   based on $pageTitle
2220          */
2221         public function prepareErrorPage( $pageTitle, $htmlTitle = false ) {
2222                 $this->setPageTitle( $pageTitle );
2223                 if ( $htmlTitle !== false ) {
2224                         $this->setHTMLTitle( $htmlTitle );
2225                 }
2226                 $this->setRobotPolicy( 'noindex,nofollow' );
2227                 $this->setArticleRelated( false );
2228                 $this->enableClientCache( false );
2229                 $this->mRedirect = '';
2230                 $this->clearSubtitle();
2231                 $this->clearHTML();
2232         }
2233
2234         /**
2235          * Output a standard error page
2236          *
2237          * showErrorPage( 'titlemsg', 'pagetextmsg' );
2238          * showErrorPage( 'titlemsg', 'pagetextmsg', array( 'param1', 'param2' ) );
2239          * showErrorPage( 'titlemsg', $messageObject );
2240          * showErrorPage( $titleMessageObject, $messageObject );
2241          *
2242          * @param string|Message $title Message key (string) for page title, or a Message object
2243          * @param string|Message $msg Message key (string) for page text, or a Message object
2244          * @param array $params Message parameters; ignored if $msg is a Message object
2245          */
2246         public function showErrorPage( $title, $msg, $params = array() ) {
2247                 if ( !$title instanceof Message ) {
2248                         $title = $this->msg( $title );
2249                 }
2250
2251                 $this->prepareErrorPage( $title );
2252
2253                 if ( $msg instanceof Message ) {
2254                         if ( $params !== array() ) {
2255                                 trigger_error( 'Argument ignored: $params. The message parameters argument '
2256                                         . 'is discarded when the $msg argument is a Message object instead of '
2257                                         . 'a string.', E_USER_NOTICE );
2258                         }
2259                         $this->addHTML( $msg->parseAsBlock() );
2260                 } else {
2261                         $this->addWikiMsgArray( $msg, $params );
2262                 }
2263
2264                 $this->returnToMain();
2265         }
2266
2267         /**
2268          * Output a standard permission error page
2269          *
2270          * @param array $errors Error message keys
2271          * @param string $action Action that was denied or null if unknown
2272          */
2273         public function showPermissionsErrorPage( array $errors, $action = null ) {
2274                 // For some action (read, edit, create and upload), display a "login to do this action"
2275                 // error if all of the following conditions are met:
2276                 // 1. the user is not logged in
2277                 // 2. the only error is insufficient permissions (i.e. no block or something else)
2278                 // 3. the error can be avoided simply by logging in
2279                 if ( in_array( $action, array( 'read', 'edit', 'createpage', 'createtalk', 'upload' ) )
2280                         && $this->getUser()->isAnon() && count( $errors ) == 1 && isset( $errors[0][0] )
2281                         && ( $errors[0][0] == 'badaccess-groups' || $errors[0][0] == 'badaccess-group0' )
2282                         && ( User::groupHasPermission( 'user', $action )
2283                         || User::groupHasPermission( 'autoconfirmed', $action ) )
2284                 ) {
2285                         $displayReturnto = null;
2286
2287                         # Due to bug 32276, if a user does not have read permissions,
2288                         # $this->getTitle() will just give Special:Badtitle, which is
2289                         # not especially useful as a returnto parameter. Use the title
2290                         # from the request instead, if there was one.
2291                         $request = $this->getRequest();
2292                         $returnto = Title::newFromURL( $request->getVal( 'title', '' ) );
2293                         if ( $action == 'edit' ) {
2294                                 $msg = 'whitelistedittext';
2295                                 $displayReturnto = $returnto;
2296                         } elseif ( $action == 'createpage' || $action == 'createtalk' ) {
2297                                 $msg = 'nocreatetext';
2298                         } elseif ( $action == 'upload' ) {
2299                                 $msg = 'uploadnologintext';
2300                         } else { # Read
2301                                 $msg = 'loginreqpagetext';
2302                                 $displayReturnto = Title::newMainPage();
2303                         }
2304
2305                         $query = array();
2306
2307                         if ( $returnto ) {
2308                                 $query['returnto'] = $returnto->getPrefixedText();
2309
2310                                 if ( !$request->wasPosted() ) {
2311                                         $returntoquery = $request->getValues();
2312                                         unset( $returntoquery['title'] );
2313                                         unset( $returntoquery['returnto'] );
2314                                         unset( $returntoquery['returntoquery'] );
2315                                         $query['returntoquery'] = wfArrayToCgi( $returntoquery );
2316                                 }
2317                         }
2318                         $loginLink = Linker::linkKnown(
2319                                 SpecialPage::getTitleFor( 'Userlogin' ),
2320                                 $this->msg( 'loginreqlink' )->escaped(),
2321                                 array(),
2322                                 $query
2323                         );
2324
2325                         $this->prepareErrorPage( $this->msg( 'loginreqtitle' ) );
2326                         $this->addHTML( $this->msg( $msg )->rawParams( $loginLink )->parse() );
2327
2328                         # Don't return to a page the user can't read otherwise
2329                         # we'll end up in a pointless loop
2330                         if ( $displayReturnto && $displayReturnto->userCan( 'read', $this->getUser() ) ) {
2331                                 $this->returnToMain( null, $displayReturnto );
2332                         }
2333                 } else {
2334                         $this->prepareErrorPage( $this->msg( 'permissionserrors' ) );
2335                         $this->addWikiText( $this->formatPermissionsErrorMessage( $errors, $action ) );
2336                 }
2337         }
2338
2339         /**
2340          * Display an error page indicating that a given version of MediaWiki is
2341          * required to use it
2342          *
2343          * @param mixed $version The version of MediaWiki needed to use the page
2344          */
2345         public function versionRequired( $version ) {
2346                 $this->prepareErrorPage( $this->msg( 'versionrequired', $version ) );
2347
2348                 $this->addWikiMsg( 'versionrequiredtext', $version );
2349                 $this->returnToMain();
2350         }
2351
2352         /**
2353          * Display an error page noting that a given permission bit is required.
2354          * @deprecated since 1.18, just throw the exception directly
2355          * @param string $permission Key required
2356          * @throws PermissionsError
2357          */
2358         public function permissionRequired( $permission ) {
2359                 throw new PermissionsError( $permission );
2360         }
2361
2362         /**
2363          * Produce the stock "please login to use the wiki" page
2364          *
2365          * @deprecated since 1.19; throw the exception directly
2366          */
2367         public function loginToUse() {
2368                 throw new PermissionsError( 'read' );
2369         }
2370
2371         /**
2372          * Format a list of error messages
2373          *
2374          * @param array $errors Array of arrays returned by Title::getUserPermissionsErrors
2375          * @param string $action Action that was denied or null if unknown
2376          * @return string The wikitext error-messages, formatted into a list.
2377          */
2378         public function formatPermissionsErrorMessage( array $errors, $action = null ) {
2379                 if ( $action == null ) {
2380                         $text = $this->msg( 'permissionserrorstext', count( $errors ) )->plain() . "\n\n";
2381                 } else {
2382                         $action_desc = $this->msg( "action-$action" )->plain();
2383                         $text = $this->msg(
2384                                 'permissionserrorstext-withaction',
2385                                 count( $errors ),
2386                                 $action_desc
2387                         )->plain() . "\n\n";
2388                 }
2389
2390                 if ( count( $errors ) > 1 ) {
2391                         $text .= '<ul class="permissions-errors">' . "\n";
2392
2393                         foreach ( $errors as $error ) {
2394                                 $text .= '<li>';
2395                                 $text .= call_user_func_array( array( $this, 'msg' ), $error )->plain();
2396                                 $text .= "</li>\n";
2397                         }
2398                         $text .= '</ul>';
2399                 } else {
2400                         $text .= "<div class=\"permissions-errors\">\n" .
2401                                         call_user_func_array( array( $this, 'msg' ), reset( $errors ) )->plain() .
2402                                         "\n</div>";
2403                 }
2404
2405                 return $text;
2406         }
2407
2408         /**
2409          * Display a page stating that the Wiki is in read-only mode,
2410          * and optionally show the source of the page that the user
2411          * was trying to edit.  Should only be called (for this
2412          * purpose) after wfReadOnly() has returned true.
2413          *
2414          * For historical reasons, this function is _also_ used to
2415          * show the error message when a user tries to edit a page
2416          * they are not allowed to edit.  (Unless it's because they're
2417          * blocked, then we show blockedPage() instead.)  In this
2418          * case, the second parameter should be set to true and a list
2419          * of reasons supplied as the third parameter.
2420          *
2421          * @todo Needs to be split into multiple functions.
2422          *
2423          * @param string $source Source code to show (or null).
2424          * @param bool $protected Is this a permissions error?
2425          * @param array $reasons List of reasons for this error, as returned by
2426          *   Title::getUserPermissionsErrors().
2427          * @param string $action Action that was denied or null if unknown
2428          * @throws ReadOnlyError
2429          */
2430         public function readOnlyPage( $source = null, $protected = false,
2431                 array $reasons = array(), $action = null
2432         ) {
2433                 $this->setRobotPolicy( 'noindex,nofollow' );
2434                 $this->setArticleRelated( false );
2435
2436                 // If no reason is given, just supply a default "I can't let you do
2437                 // that, Dave" message.  Should only occur if called by legacy code.
2438                 if ( $protected && empty( $reasons ) ) {
2439                         $reasons[] = array( 'badaccess-group0' );
2440                 }
2441
2442                 if ( !empty( $reasons ) ) {
2443                         // Permissions error
2444                         if ( $source ) {
2445                                 $this->setPageTitle( $this->msg( 'viewsource-title', $this->getTitle()->getPrefixedText() ) );
2446                                 $this->addBacklinkSubtitle( $this->getTitle() );
2447                         } else {
2448                                 $this->setPageTitle( $this->msg( 'badaccess' ) );
2449                         }
2450                         $this->addWikiText( $this->formatPermissionsErrorMessage( $reasons, $action ) );
2451                 } else {
2452                         // Wiki is read only
2453                         throw new ReadOnlyError;
2454                 }
2455
2456                 // Show source, if supplied
2457                 if ( is_string( $source ) ) {
2458                         $this->addWikiMsg( 'viewsourcetext' );
2459
2460                         $pageLang = $this->getTitle()->getPageLanguage();
2461                         $params = array(
2462                                 'id' => 'wpTextbox1',
2463                                 'name' => 'wpTextbox1',
2464                                 'cols' => $this->getUser()->getOption( 'cols' ),
2465                                 'rows' => $this->getUser()->getOption( 'rows' ),
2466                                 'readonly' => 'readonly',
2467                                 'lang' => $pageLang->getHtmlCode(),
2468                                 'dir' => $pageLang->getDir(),
2469                         );
2470                         $this->addHTML( Html::element( 'textarea', $params, $source ) );
2471
2472                         // Show templates used by this article
2473                         $templates = Linker::formatTemplates( $this->getTitle()->getTemplateLinksFrom() );
2474                         $this->addHTML( "<div class='templatesUsed'>
2475 $templates
2476 </div>
2477 " );
2478                 }
2479
2480                 # If the title doesn't exist, it's fairly pointless to print a return
2481                 # link to it.  After all, you just tried editing it and couldn't, so
2482                 # what's there to do there?
2483                 if ( $this->getTitle()->exists() ) {
2484                         $this->returnToMain( null, $this->getTitle() );
2485                 }
2486         }
2487
2488         /**
2489          * Turn off regular page output and return an error response
2490          * for when rate limiting has triggered.
2491          */
2492         public function rateLimited() {
2493                 throw new ThrottledError;
2494         }
2495
2496         /**
2497          * Show a warning about slave lag
2498          *
2499          * If the lag is higher than $wgSlaveLagCritical seconds,
2500          * then the warning is a bit more obvious. If the lag is
2501          * lower than $wgSlaveLagWarning, then no warning is shown.
2502          *
2503          * @param int $lag Slave lag
2504          */
2505         public function showLagWarning( $lag ) {
2506                 global $wgSlaveLagWarning, $wgSlaveLagCritical;
2507                 if ( $lag >= $wgSlaveLagWarning ) {
2508                         $message = $lag < $wgSlaveLagCritical
2509                                 ? 'lag-warn-normal'
2510                                 : 'lag-warn-high';
2511                         $wrap = Html::rawElement( 'div', array( 'class' => "mw-{$message}" ), "\n$1\n" );
2512                         $this->wrapWikiMsg( "$wrap\n", array( $message, $this->getLanguage()->formatNum( $lag ) ) );
2513                 }
2514         }
2515
2516         public function showFatalError( $message ) {
2517                 $this->prepareErrorPage( $this->msg( 'internalerror' ) );
2518
2519                 $this->addHTML( $message );
2520         }
2521
2522         public function showUnexpectedValueError( $name, $val ) {
2523                 $this->showFatalError( $this->msg( 'unexpected', $name, $val )->text() );
2524         }
2525
2526         public function showFileCopyError( $old, $new ) {
2527                 $this->showFatalError( $this->msg( 'filecopyerror', $old, $new )->text() );
2528         }
2529
2530         public function showFileRenameError( $old, $new ) {
2531                 $this->showFatalError( $this->msg( 'filerenameerror', $old, $new )->text() );
2532         }
2533
2534         public function showFileDeleteError( $name ) {
2535                 $this->showFatalError( $this->msg( 'filedeleteerror', $name )->text() );
2536         }
2537
2538         public function showFileNotFoundError( $name ) {
2539                 $this->showFatalError( $this->msg( 'filenotfound', $name )->text() );
2540         }
2541
2542         /**
2543          * Add a "return to" link pointing to a specified title
2544          *
2545          * @param Title $title Title to link
2546          * @param array $query Query string parameters
2547          * @param string $text Text of the link (input is not escaped)
2548          * @param array $options Options array to pass to Linker
2549          */
2550         public function addReturnTo( $title, array $query = array(), $text = null, $options = array() ) {
2551                 $link = $this->msg( 'returnto' )->rawParams(
2552                         Linker::link( $title, $text, array(), $query, $options ) )->escaped();
2553                 $this->addHTML( "<p id=\"mw-returnto\">{$link}</p>\n" );
2554         }
2555
2556         /**
2557          * Add a "return to" link pointing to a specified title,
2558          * or the title indicated in the request, or else the main page
2559          *
2560          * @param mixed $unused
2561          * @param Title|string $returnto Title or String to return to
2562          * @param string $returntoquery Query string for the return to link
2563          */
2564         public function returnToMain( $unused = null, $returnto = null, $returntoquery = null ) {
2565                 if ( $returnto == null ) {
2566                         $returnto = $this->getRequest()->getText( 'returnto' );
2567                 }
2568
2569                 if ( $returntoquery == null ) {
2570                         $returntoquery = $this->getRequest()->getText( 'returntoquery' );
2571                 }
2572
2573                 if ( $returnto === '' ) {
2574                         $returnto = Title::newMainPage();
2575                 }
2576
2577                 if ( is_object( $returnto ) ) {
2578                         $titleObj = $returnto;
2579                 } else {
2580                         $titleObj = Title::newFromText( $returnto );
2581                 }
2582                 if ( !is_object( $titleObj ) ) {
2583                         $titleObj = Title::newMainPage();
2584                 }
2585
2586                 $this->addReturnTo( $titleObj, wfCgiToArray( $returntoquery ) );
2587         }
2588
2589         /**
2590          * @param Skin $sk The given Skin
2591          * @param bool $includeStyle Unused
2592          * @return string The doctype, opening "<html>", and head element.
2593          */
2594         public function headElement( Skin $sk, $includeStyle = true ) {
2595                 global $wgContLang, $wgMimeType;
2596
2597                 $userdir = $this->getLanguage()->getDir();
2598                 $sitedir = $wgContLang->getDir();
2599
2600                 $ret = Html::htmlHeader( $sk->getHtmlElementAttributes() );
2601
2602                 if ( $this->getHTMLTitle() == '' ) {
2603                         $this->setHTMLTitle( $this->msg( 'pagetitle', $this->getPageTitle() )->inContentLanguage() );
2604                 }
2605
2606                 $openHead = Html::openElement( 'head' );
2607                 if ( $openHead ) {
2608                         # Don't bother with the newline if $head == ''
2609                         $ret .= "$openHead\n";
2610                 }
2611
2612                 if ( !Html::isXmlMimeType( $wgMimeType ) ) {
2613                         // Add <meta charset="UTF-8">
2614                         // This should be before <title> since it defines the charset used by
2615                         // text including the text inside <title>.
2616                         // The spec recommends defining XHTML5's charset using the XML declaration
2617                         // instead of meta.
2618                         // Our XML declaration is output by Html::htmlHeader.
2619                         // http://www.whatwg.org/html/semantics.html#attr-meta-http-equiv-content-type
2620                         // http://www.whatwg.org/html/semantics.html#charset
2621                         $ret .= Html::element( 'meta', array( 'charset' => 'UTF-8' ) ) . "\n";
2622                 }
2623
2624                 $ret .= Html::element( 'title', null, $this->getHTMLTitle() ) . "\n";
2625
2626                 foreach ( $this->getHeadLinksArray() as $item ) {
2627                         $ret .= $item . "\n";
2628                 }
2629
2630                 // No newline after buildCssLinks since makeResourceLoaderLink did that already
2631                 $ret .= $this->buildCssLinks();
2632
2633                 $ret .= $this->getHeadScripts() . "\n";
2634
2635                 foreach ( $this->mHeadItems as $item ) {
2636                         $ret .= $item . "\n";
2637                 }
2638
2639                 $closeHead = Html::closeElement( 'head' );
2640                 if ( $closeHead ) {
2641                         $ret .= "$closeHead\n";
2642                 }
2643
2644                 $bodyClasses = array();
2645                 $bodyClasses[] = 'mediawiki';
2646
2647                 # Classes for LTR/RTL directionality support
2648                 $bodyClasses[] = $userdir;
2649                 $bodyClasses[] = "sitedir-$sitedir";
2650
2651                 if ( $this->getLanguage()->capitalizeAllNouns() ) {
2652                         # A <body> class is probably not the best way to do this . . .
2653                         $bodyClasses[] = 'capitalize-all-nouns';
2654                 }
2655
2656                 $bodyClasses[] = $sk->getPageClasses( $this->getTitle() );
2657                 $bodyClasses[] = 'skin-' . Sanitizer::escapeClass( $sk->getSkinName() );
2658                 $bodyClasses[] =
2659                         'action-' . Sanitizer::escapeClass( Action::getActionName( $this->getContext() ) );
2660
2661                 $bodyAttrs = array();
2662                 // While the implode() is not strictly needed, it's used for backwards compatibility
2663                 // (this used to be built as a string and hooks likely still expect that).
2664                 $bodyAttrs['class'] = implode( ' ', $bodyClasses );
2665
2666                 // Allow skins and extensions to add body attributes they need
2667                 $sk->addToBodyAttributes( $this, $bodyAttrs );
2668                 wfRunHooks( 'OutputPageBodyAttributes', array( $this, $sk, &$bodyAttrs ) );
2669
2670                 $ret .= Html::openElement( 'body', $bodyAttrs ) . "\n";
2671
2672                 return $ret;
2673         }
2674
2675         /**
2676          * Get a ResourceLoader object associated with this OutputPage
2677          *
2678          * @return ResourceLoader
2679          */
2680         public function getResourceLoader() {
2681                 if ( is_null( $this->mResourceLoader ) ) {
2682                         $this->mResourceLoader = new ResourceLoader();
2683                 }
2684                 return $this->mResourceLoader;
2685         }
2686
2687         /**
2688          * @todo Document
2689          * @param array|string $modules One or more module names
2690          * @param string $only ResourceLoaderModule TYPE_ class constant
2691          * @param bool $useESI
2692          * @param array $extraQuery Array with extra query parameters to add to each
2693          *   request. array( param => value ).
2694          * @param bool $loadCall If true, output an (asynchronous) mw.loader.load()
2695          *   call rather than a "<script src='...'>" tag.
2696          * @return string The html "<script>", "<link>" and "<style>" tags
2697          */
2698         protected function makeResourceLoaderLink( $modules, $only, $useESI = false,
2699                 array $extraQuery = array(), $loadCall = false
2700         ) {
2701                 global $wgResourceLoaderUseESI;
2702
2703                 $modules = (array)$modules;
2704
2705                 $links = array(
2706                         'html' => '',
2707                         'states' => array(),
2708                 );
2709
2710                 if ( !count( $modules ) ) {
2711                         return $links;
2712                 }
2713
2714                 if ( count( $modules ) > 1 ) {
2715                         // Remove duplicate module requests
2716                         $modules = array_unique( $modules );
2717                         // Sort module names so requests are more uniform
2718                         sort( $modules );
2719
2720                         if ( ResourceLoader::inDebugMode() ) {
2721                                 // Recursively call us for every item
2722                                 foreach ( $modules as $name ) {
2723                                         $link = $this->makeResourceLoaderLink( $name, $only, $useESI );
2724                                         $links['html'] .= $link['html'];
2725                                         $links['states'] += $link['states'];
2726                                 }
2727                                 return $links;
2728                         }
2729                 }
2730
2731                 if ( !is_null( $this->mTarget ) ) {
2732                         $extraQuery['target'] = $this->mTarget;
2733                 }
2734
2735                 // Create keyed-by-source and then keyed-by-group list of module objects from modules list
2736                 $sortedModules = array();
2737                 $resourceLoader = $this->getResourceLoader();
2738                 foreach ( $modules as $name ) {
2739                         $module = $resourceLoader->getModule( $name );
2740                         # Check that we're allowed to include this module on this page
2741                         if ( !$module
2742                                 || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_SCRIPTS )
2743                                         && $only == ResourceLoaderModule::TYPE_SCRIPTS )
2744                                 || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_STYLES )
2745                                         && $only == ResourceLoaderModule::TYPE_STYLES )
2746                                 || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_COMBINED )
2747                                         && $only == ResourceLoaderModule::TYPE_COMBINED )
2748                                 || ( $this->mTarget && !in_array( $this->mTarget, $module->getTargets() ) )
2749                         ) {
2750                                 continue;
2751                         }
2752
2753                         $sortedModules[$module->getSource()][$module->getGroup()][$name] = $module;
2754                 }
2755
2756                 foreach ( $sortedModules as $source => $groups ) {
2757                         foreach ( $groups as $group => $grpModules ) {
2758                                 // Special handling for user-specific groups
2759                                 $user = null;
2760                                 if ( ( $group === 'user' || $group === 'private' ) && $this->getUser()->isLoggedIn() ) {
2761                                         $user = $this->getUser()->getName();
2762                                 }
2763
2764                                 // Create a fake request based on the one we are about to make so modules return
2765                                 // correct timestamp and emptiness data
2766                                 $query = ResourceLoader::makeLoaderQuery(
2767                                         array(), // modules; not determined yet
2768                                         $this->getLanguage()->getCode(),
2769                                         $this->getSkin()->getSkinName(),
2770                                         $user,
2771                                         null, // version; not determined yet
2772                                         ResourceLoader::inDebugMode(),
2773                                         $only === ResourceLoaderModule::TYPE_COMBINED ? null : $only,
2774                                         $this->isPrintable(),
2775                                         $this->getRequest()->getBool( 'handheld' ),
2776                                         $extraQuery
2777                                 );
2778                                 $context = new ResourceLoaderContext( $resourceLoader, new FauxRequest( $query ) );
2779
2780                                 // Extract modules that know they're empty
2781                                 foreach ( $grpModules as $key => $module ) {
2782                                         // Inline empty modules: since they're empty, just mark them as 'ready' (bug 46857)
2783                                         // If we're only getting the styles, we don't need to do anything for empty modules.
2784                                         if ( $module->isKnownEmpty( $context ) ) {
2785                                                 unset( $grpModules[$key] );
2786                                                 if ( $only !== ResourceLoaderModule::TYPE_STYLES ) {
2787                                                         $links['states'][$key] = 'ready';
2788                                                 }
2789                                         }
2790                                 }
2791
2792                                 // If there are no non-empty modules, skip this group
2793                                 if ( count( $grpModules ) === 0 ) {
2794                                         continue;
2795                                 }
2796
2797                                 // Inline private modules. These can't be loaded through load.php for security
2798                                 // reasons, see bug 34907. Note that these modules should be loaded from
2799                                 // getHeadScripts() before the first loader call. Otherwise other modules can't
2800                                 // properly use them as dependencies (bug 30914)
2801                                 if ( $group === 'private' ) {
2802                                         if ( $only == ResourceLoaderModule::TYPE_STYLES ) {
2803                                                 $links['html'] .= Html::inlineStyle(
2804                                                         $resourceLoader->makeModuleResponse( $context, $grpModules )
2805                                                 );
2806                                         } else {
2807                                                 $links['html'] .= Html::inlineScript(
2808                                                         $resourceLoader->makeModuleResponse( $context, $grpModules )
2809                                                 );
2810                                         }
2811                                         $links['html'] .= "\n";
2812                                         continue;
2813                                 }
2814
2815                                 // Special handling for the user group; because users might change their stuff
2816                                 // on-wiki like user pages, or user preferences; we need to find the highest
2817                                 // timestamp of these user-changeable modules so we can ensure cache misses on change
2818                                 // This should NOT be done for the site group (bug 27564) because anons get that too
2819                                 // and we shouldn't be putting timestamps in Squid-cached HTML
2820                                 $version = null;
2821                                 if ( $group === 'user' ) {
2822                                         // Get the maximum timestamp
2823                                         $timestamp = 1;
2824                                         foreach ( $grpModules as $module ) {
2825                                                 $timestamp = max( $timestamp, $module->getModifiedTime( $context ) );
2826                                         }
2827                                         // Add a version parameter so cache will break when things change
2828                                         $query['version'] = wfTimestamp( TS_ISO_8601_BASIC, $timestamp );
2829                                 }
2830
2831                                 $query['modules'] = ResourceLoader::makePackedModulesString( array_keys( $grpModules ) );
2832                                 $moduleContext = new ResourceLoaderContext( $resourceLoader, new FauxRequest( $query ) );
2833                                 $url = $resourceLoader->createLoaderURL( $source, $moduleContext, $extraQuery );
2834
2835                                 if ( $useESI && $wgResourceLoaderUseESI ) {
2836                                         $esi = Xml::element( 'esi:include', array( 'src' => $url ) );
2837                                         if ( $only == ResourceLoaderModule::TYPE_STYLES ) {
2838                                                 $link = Html::inlineStyle( $esi );
2839                                         } else {
2840                                                 $link = Html::inlineScript( $esi );
2841                                         }
2842                                 } else {
2843                                         // Automatically select style/script elements
2844                                         if ( $only === ResourceLoaderModule::TYPE_STYLES ) {
2845                                                 $link = Html::linkedStyle( $url );
2846                                         } elseif ( $loadCall ) {
2847                                                 $link = Html::inlineScript(
2848                                                         ResourceLoader::makeLoaderConditionalScript(
2849                                                                 Xml::encodeJsCall( 'mw.loader.load', array( $url, 'text/javascript', true ) )
2850                                                         )
2851                                                 );
2852                                         } else {
2853                                                 $link = Html::linkedScript( $url );
2854
2855                                                 // For modules requested directly in the html via <link> or <script>,
2856                                                 // tell mw.loader they are being loading to prevent duplicate requests.
2857                                                 foreach ( $grpModules as $key => $module ) {
2858                                                         // Don't output state=loading for the startup module..
2859                                                         if ( $key !== 'startup' ) {
2860                                                                 $links['states'][$key] = 'loading';
2861                                                         }
2862                                                 }
2863                                         }
2864                                 }
2865
2866                                 if ( $group == 'noscript' ) {
2867                                         $links['html'] .= Html::rawElement( 'noscript', array(), $link ) . "\n";
2868                                 } else {
2869                                         $links['html'] .= $link . "\n";
2870                                 }
2871                         }
2872                 }
2873
2874                 return $links;
2875         }
2876
2877         /**
2878          * Build html output from an array of links from makeResourceLoaderLink.
2879          * @param array $links
2880          * @return string HTML
2881          */
2882         protected static function getHtmlFromLoaderLinks( array $links ) {
2883                 $html = '';
2884                 $states = array();
2885                 foreach ( $links as $link ) {
2886                         if ( !is_array( $link ) ) {
2887                                 $html .= $link;
2888                         } else {
2889                                 $html .= $link['html'];
2890                                 $states += $link['states'];
2891                         }
2892                 }
2893
2894                 if ( count( $states ) ) {
2895                         $html = Html::inlineScript(
2896                                 ResourceLoader::makeLoaderConditionalScript(
2897                                         ResourceLoader::makeLoaderStateScript( $states )
2898                                 )
2899                         ) . "\n" . $html;
2900                 }
2901
2902                 return $html;
2903         }
2904
2905         /**
2906          * JS stuff to put in the "<head>". This is the startup module, config
2907          * vars and modules marked with position 'top'
2908          *
2909          * @return string HTML fragment
2910          */
2911         function getHeadScripts() {
2912                 global $wgResourceLoaderExperimentalAsyncLoading;
2913
2914                 // Startup - this will immediately load jquery and mediawiki modules
2915                 $links = array();
2916                 $links[] = $this->makeResourceLoaderLink( 'startup', ResourceLoaderModule::TYPE_SCRIPTS, true );
2917
2918                 // Load config before anything else
2919                 $links[] = Html::inlineScript(
2920                         ResourceLoader::makeLoaderConditionalScript(
2921                                 ResourceLoader::makeConfigSetScript( $this->getJSVars() )
2922                         )
2923                 );
2924
2925                 // Load embeddable private modules before any loader links
2926                 // This needs to be TYPE_COMBINED so these modules are properly wrapped
2927                 // in mw.loader.implement() calls and deferred until mw.user is available
2928                 $embedScripts = array( 'user.options', 'user.tokens' );
2929                 $links[] = $this->makeResourceLoaderLink( $embedScripts, ResourceLoaderModule::TYPE_COMBINED );
2930
2931                 // Scripts and messages "only" requests marked for top inclusion
2932                 // Messages should go first
2933                 $links[] = $this->makeResourceLoaderLink(
2934                         $this->getModuleMessages( true, 'top' ),
2935                         ResourceLoaderModule::TYPE_MESSAGES
2936                 );
2937                 $links[] = $this->makeResourceLoaderLink(
2938                         $this->getModuleScripts( true, 'top' ),
2939                         ResourceLoaderModule::TYPE_SCRIPTS
2940                 );
2941
2942                 // Modules requests - let the client calculate dependencies and batch requests as it likes
2943                 // Only load modules that have marked themselves for loading at the top
2944                 $modules = $this->getModules( true, 'top' );
2945                 if ( $modules ) {
2946                         $links[] = Html::inlineScript(
2947                                 ResourceLoader::makeLoaderConditionalScript(
2948                                         Xml::encodeJsCall( 'mw.loader.load', array( $modules ) )
2949                                 )
2950                         );
2951                 }
2952
2953                 if ( $wgResourceLoaderExperimentalAsyncLoading ) {
2954                         $links[] = $this->getScriptsForBottomQueue( true );
2955                 }
2956
2957                 return self::getHtmlFromLoaderLinks( $links );
2958         }
2959
2960         /**
2961          * JS stuff to put at the 'bottom', which can either be the bottom of the
2962          * "<body>" or the bottom of the "<head>" depending on
2963          * $wgResourceLoaderExperimentalAsyncLoading: modules marked with position
2964          * 'bottom', legacy scripts ($this->mScripts), user preferences, site JS
2965          * and user JS.
2966          *
2967          * @param bool $inHead If true, this HTML goes into the "<head>",
2968          *   if false it goes into the "<body>".
2969          * @return string
2970          */
2971         function getScriptsForBottomQueue( $inHead ) {
2972                 global $wgAllowUserJs;
2973
2974                 // Scripts and messages "only" requests marked for bottom inclusion
2975                 // If we're in the <head>, use load() calls rather than <script src="..."> tags
2976                 // Messages should go first
2977                 $links = array();
2978                 $links[] = $this->makeResourceLoaderLink( $this->getModuleMessages( true, 'bottom' ),
2979                         ResourceLoaderModule::TYPE_MESSAGES, /* $useESI = */ false, /* $extraQuery = */ array(),
2980                         /* $loadCall = */ $inHead
2981                 );
2982                 $links[] = $this->makeResourceLoaderLink( $this->getModuleScripts( true, 'bottom' ),
2983                         ResourceLoaderModule::TYPE_SCRIPTS, /* $useESI = */ false, /* $extraQuery = */ array(),
2984                         /* $loadCall = */ $inHead
2985                 );
2986
2987                 // Modules requests - let the client calculate dependencies and batch requests as it likes
2988                 // Only load modules that have marked themselves for loading at the bottom
2989                 $modules = $this->getModules( true, 'bottom' );
2990                 if ( $modules ) {
2991                         $links[] = Html::inlineScript(
2992                                 ResourceLoader::makeLoaderConditionalScript(
2993                                         Xml::encodeJsCall( 'mw.loader.load', array( $modules, null, true ) )
2994                                 )
2995                         );
2996                 }
2997
2998                 // Legacy Scripts
2999                 $links[] = "\n" . $this->mScripts;
3000
3001                 // Add site JS if enabled
3002                 $links[] = $this->makeResourceLoaderLink( 'site', ResourceLoaderModule::TYPE_SCRIPTS,
3003                         /* $useESI = */ false, /* $extraQuery = */ array(), /* $loadCall = */ $inHead
3004                 );
3005
3006                 // Add user JS if enabled
3007                 if ( $wgAllowUserJs
3008                         && $this->getUser()->isLoggedIn()
3009                         && $this->getTitle()
3010                         && $this->getTitle()->isJsSubpage()
3011                         && $this->userCanPreview()
3012                 ) {
3013                         # XXX: additional security check/prompt?
3014                         // We're on a preview of a JS subpage
3015                         // Exclude this page from the user module in case it's in there (bug 26283)
3016                         $links[] = $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_SCRIPTS, false,
3017                                 array( 'excludepage' => $this->getTitle()->getPrefixedDBkey() ), $inHead
3018                         );
3019                         // Load the previewed JS
3020                         $links[] = Html::inlineScript( "\n"
3021                                         . $this->getRequest()->getText( 'wpTextbox1' ) . "\n" ) . "\n";
3022
3023                         // FIXME: If the user is previewing, say, ./vector.js, his ./common.js will be loaded
3024                         // asynchronously and may arrive *after* the inline script here. So the previewed code
3025                         // may execute before ./common.js runs. Normally, ./common.js runs before ./vector.js...
3026                 } else {
3027                         // Include the user module normally, i.e., raw to avoid it being wrapped in a closure.
3028                         $links[] = $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_SCRIPTS,
3029                                 /* $useESI = */ false, /* $extraQuery = */ array(), /* $loadCall = */ $inHead
3030                         );
3031                 }
3032
3033                 // Group JS is only enabled if site JS is enabled.
3034                 $links[] = $this->makeResourceLoaderLink( 'user.groups', ResourceLoaderModule::TYPE_COMBINED,
3035                         /* $useESI = */ false, /* $extraQuery = */ array(), /* $loadCall = */ $inHead
3036                 );
3037
3038                 return self::getHtmlFromLoaderLinks( $links );
3039         }
3040
3041         /**
3042          * JS stuff to put at the bottom of the "<body>"
3043          * @return string
3044          */
3045         function getBottomScripts() {
3046                 global $wgResourceLoaderExperimentalAsyncLoading;
3047
3048                 // Optimise jQuery ready event cross-browser.
3049                 // This also enforces $.isReady to be true at </body> which fixes the
3050                 // mw.loader bug in Firefox with using document.write between </body>
3051                 // and the DOMContentReady event (bug 47457).
3052                 $html = Html::inlineScript( 'window.jQuery && jQuery.ready();' );
3053
3054                 if ( !$wgResourceLoaderExperimentalAsyncLoading ) {
3055                         $html .= $this->getScriptsForBottomQueue( false );
3056                 }
3057
3058                 return $html;
3059         }
3060
3061         /**
3062          * Get the javascript config vars to include on this page
3063          *
3064          * @return array Array of javascript config vars
3065          * @since 1.23
3066          */
3067         public function getJsConfigVars() {
3068                 return $this->mJsConfigVars;
3069         }
3070
3071         /**
3072          * Add one or more variables to be set in mw.config in JavaScript
3073          *
3074          * @param string|array $keys Key or array of key/value pairs
3075          * @param mixed $value [optional] Value of the configuration variable
3076          */
3077         public function addJsConfigVars( $keys, $value = null ) {
3078                 if ( is_array( $keys ) ) {
3079                         foreach ( $keys as $key => $value ) {
3080                                 $this->mJsConfigVars[$key] = $value;
3081                         }
3082                         return;
3083                 }
3084
3085                 $this->mJsConfigVars[$keys] = $value;
3086         }
3087
3088         /**
3089          * Get an array containing the variables to be set in mw.config in JavaScript.
3090          *
3091          * Do not add things here which can be evaluated in ResourceLoaderStartUpModule
3092          * - in other words, page-independent/site-wide variables (without state).
3093          * You will only be adding bloat to the html page and causing page caches to
3094          * have to be purged on configuration changes.
3095          * @return array
3096          */
3097         private function getJSVars() {
3098                 global $wgContLang;
3099
3100                 $curRevisionId = 0;
3101                 $articleId = 0;
3102                 $canonicalSpecialPageName = false; # bug 21115
3103
3104                 $title = $this->getTitle();
3105                 $ns = $title->getNamespace();
3106                 $canonicalNamespace = MWNamespace::exists( $ns )
3107                         ? MWNamespace::getCanonicalName( $ns )
3108                         : $title->getNsText();
3109
3110                 $sk = $this->getSkin();
3111                 // Get the relevant title so that AJAX features can use the correct page name
3112                 // when making API requests from certain special pages (bug 34972).
3113                 $relevantTitle = $sk->getRelevantTitle();
3114                 $relevantUser = $sk->getRelevantUser();
3115
3116                 if ( $ns == NS_SPECIAL ) {
3117                         list( $canonicalSpecialPageName, /*...*/ ) =
3118                                 SpecialPageFactory::resolveAlias( $title->getDBkey() );
3119                 } elseif ( $this->canUseWikiPage() ) {
3120                         $wikiPage = $this->getWikiPage();
3121                         $curRevisionId = $wikiPage->getLatest();
3122                         $articleId = $wikiPage->getId();
3123                 }
3124
3125                 $lang = $title->getPageLanguage();
3126
3127                 // Pre-process information
3128                 $separatorTransTable = $lang->separatorTransformTable();
3129                 $separatorTransTable = $separatorTransTable ? $separatorTransTable : array();
3130                 $compactSeparatorTransTable = array(
3131                         implode( "\t", array_keys( $separatorTransTable ) ),
3132                         implode( "\t", $separatorTransTable ),
3133                 );
3134                 $digitTransTable = $lang->digitTransformTable();
3135                 $digitTransTable = $digitTransTable ? $digitTransTable : array();
3136                 $compactDigitTransTable = array(
3137                         implode( "\t", array_keys( $digitTransTable ) ),
3138                         implode( "\t", $digitTransTable ),
3139                 );
3140
3141                 $user = $this->getUser();
3142
3143                 $vars = array(
3144                         'wgCanonicalNamespace' => $canonicalNamespace,
3145                         'wgCanonicalSpecialPageName' => $canonicalSpecialPageName,
3146                         'wgNamespaceNumber' => $title->getNamespace(),
3147                         'wgPageName' => $title->getPrefixedDBkey(),
3148                         'wgTitle' => $title->getText(),
3149                         'wgCurRevisionId' => $curRevisionId,
3150                         'wgRevisionId' => (int)$this->getRevisionId(),
3151                         'wgArticleId' => $articleId,
3152                         'wgIsArticle' => $this->isArticle(),
3153                         'wgIsRedirect' => $title->isRedirect(),
3154                         'wgAction' => Action::getActionName( $this->getContext() ),
3155                         'wgUserName' => $user->isAnon() ? null : $user->getName(),
3156                         'wgUserGroups' => $user->getEffectiveGroups(),
3157                         'wgCategories' => $this->getCategories(),
3158                         'wgBreakFrames' => $this->getFrameOptions() == 'DENY',
3159                         'wgPageContentLanguage' => $lang->getCode(),
3160                         'wgPageContentModel' => $title->getContentModel(),
3161                         'wgSeparatorTransformTable' => $compactSeparatorTransTable,
3162                         'wgDigitTransformTable' => $compactDigitTransTable,
3163                         'wgDefaultDateFormat' => $lang->getDefaultDateFormat(),
3164                         'wgMonthNames' => $lang->getMonthNamesArray(),
3165                         'wgMonthNamesShort' => $lang->getMonthAbbreviationsArray(),
3166                         'wgRelevantPageName' => $relevantTitle->getPrefixedDBkey(),
3167                 );
3168
3169                 if ( $user->isLoggedIn() ) {
3170                         $vars['wgUserId'] = $user->getId();
3171                         $vars['wgUserEditCount'] = $user->getEditCount();
3172                         $userReg = wfTimestampOrNull( TS_UNIX, $user->getRegistration() );
3173                         $vars['wgUserRegistration'] = $userReg !== null ? ( $userReg * 1000 ) : null;
3174                         // Get the revision ID of the oldest new message on the user's talk
3175                         // page. This can be used for constructing new message alerts on
3176                         // the client side.
3177                         $vars['wgUserNewMsgRevisionId'] = $user->getNewMessageRevisionId();
3178                 }
3179
3180                 if ( $wgContLang->hasVariants() ) {
3181                         $vars['wgUserVariant'] = $wgContLang->getPreferredVariant();
3182                 }
3183                 // Same test as SkinTemplate
3184                 $vars['wgIsProbablyEditable'] = $title->quickUserCan( 'edit', $user )
3185                         && ( $title->exists() || $title->quickUserCan( 'create', $user ) );
3186
3187                 foreach ( $title->getRestrictionTypes() as $type ) {
3188                         $vars['wgRestriction' . ucfirst( $type )] = $title->getRestrictions( $type );
3189                 }
3190
3191                 if ( $title->isMainPage() ) {
3192                         $vars['wgIsMainPage'] = true;
3193                 }
3194
3195                 if ( $this->mRedirectedFrom ) {
3196                         $vars['wgRedirectedFrom'] = $this->mRedirectedFrom->getPrefixedDBkey();
3197                 }
3198
3199                 if ( $relevantUser ) {
3200                         $vars['wgRelevantUserName'] = $relevantUser->getName();
3201                 }
3202
3203                 // Allow extensions to add their custom variables to the mw.config map.
3204                 // Use the 'ResourceLoaderGetConfigVars' hook if the variable is not
3205                 // page-dependant but site-wide (without state).
3206                 // Alternatively, you may want to use OutputPage->addJsConfigVars() instead.
3207                 wfRunHooks( 'MakeGlobalVariablesScript', array( &$vars, $this ) );
3208
3209                 // Merge in variables from addJsConfigVars last
3210                 return array_merge( $vars, $this->getJsConfigVars() );
3211         }
3212
3213         /**
3214          * To make it harder for someone to slip a user a fake
3215          * user-JavaScript or user-CSS preview, a random token
3216          * is associated with the login session. If it's not
3217          * passed back with the preview request, we won't render
3218          * the code.
3219          *
3220          * @return bool
3221          */
3222         public function userCanPreview() {
3223                 if ( $this->getRequest()->getVal( 'action' ) != 'submit'
3224                         || !$this->getRequest()->wasPosted()
3225                         || !$this->getUser()->matchEditToken(
3226                                 $this->getRequest()->getVal( 'wpEditToken' ) )
3227                 ) {
3228                         return false;
3229                 }
3230                 if ( !$this->getTitle()->isJsSubpage() && !$this->getTitle()->isCssSubpage() ) {
3231                         return false;
3232                 }
3233
3234                 return !count( $this->getTitle()->getUserPermissionsErrors( 'edit', $this->getUser() ) );
3235         }
3236
3237         /**
3238          * @return array Array in format "link name or number => 'link html'".
3239          */
3240         public function getHeadLinksArray() {
3241                 global $wgUniversalEditButton, $wgFavicon, $wgAppleTouchIcon, $wgEnableAPI,
3242                         $wgSitename, $wgVersion,
3243                         $wgFeed, $wgOverrideSiteFeed, $wgAdvertisedFeedTypes,
3244                         $wgDisableLangConversion, $wgCanonicalLanguageLinks,
3245                         $wgRightsPage, $wgRightsUrl;
3246
3247                 $tags = array();
3248
3249                 $canonicalUrl = $this->mCanonicalUrl;
3250
3251                 $tags['meta-generator'] = Html::element( 'meta', array(
3252                         'name' => 'generator',
3253                         'content' => "MediaWiki $wgVersion",
3254                 ) );
3255
3256                 $p = "{$this->mIndexPolicy},{$this->mFollowPolicy}";
3257                 if ( $p !== 'index,follow' ) {
3258                         // http://www.robotstxt.org/wc/meta-user.html
3259                         // Only show if it's different from the default robots policy
3260                         $tags['meta-robots'] = Html::element( 'meta', array(
3261                                 'name' => 'robots',
3262                                 'content' => $p,
3263                         ) );
3264                 }
3265
3266                 foreach ( $this->mMetatags as $tag ) {
3267                         if ( 0 == strcasecmp( 'http:', substr( $tag[0], 0, 5 ) ) ) {
3268                                 $a = 'http-equiv';
3269                                 $tag[0] = substr( $tag[0], 5 );
3270                         } else {
3271                                 $a = 'name';
3272                         }
3273                         $tagName = "meta-{$tag[0]}";
3274                         if ( isset( $tags[$tagName] ) ) {
3275                                 $tagName .= $tag[1];
3276                         }
3277                         $tags[$tagName] = Html::element( 'meta',
3278                                 array(
3279                                         $a => $tag[0],
3280                                         'content' => $tag[1]
3281                                 )
3282                         );
3283                 }
3284
3285                 foreach ( $this->mLinktags as $tag ) {
3286                         $tags[] = Html::element( 'link', $tag );
3287                 }
3288
3289                 # Universal edit button
3290                 if ( $wgUniversalEditButton && $this->isArticleRelated() ) {
3291                         $user = $this->getUser();
3292                         if ( $this->getTitle()->quickUserCan( 'edit', $user )
3293                                 && ( $this->getTitle()->exists() || $this->getTitle()->quickUserCan( 'create', $user ) ) ) {
3294                                 // Original UniversalEditButton
3295                                 $msg = $this->msg( 'edit' )->text();
3296                                 $tags['universal-edit-button'] = Html::element( 'link', array(
3297                                         'rel' => 'alternate',
3298                                         'type' => 'application/x-wiki',
3299                                         'title' => $msg,
3300                                         'href' => $this->getTitle()->getEditURL(),
3301                                 ) );
3302                                 // Alternate edit link
3303                                 $tags['alternative-edit'] = Html::element( 'link', array(
3304                                         'rel' => 'edit',
3305                                         'title' => $msg,
3306                                         'href' => $this->getTitle()->getEditURL(),
3307                                 ) );
3308                         }
3309                 }
3310
3311                 # Generally the order of the favicon and apple-touch-icon links
3312                 # should not matter, but Konqueror (3.5.9 at least) incorrectly
3313                 # uses whichever one appears later in the HTML source. Make sure
3314                 # apple-touch-icon is specified first to avoid this.
3315                 if ( $wgAppleTouchIcon !== false ) {
3316                         $tags['apple-touch-icon'] = Html::element( 'link', array(
3317                                 'rel' => 'apple-touch-icon',
3318                                 'href' => $wgAppleTouchIcon
3319                         ) );
3320                 }
3321
3322                 if ( $wgFavicon !== false ) {
3323                         $tags['favicon'] = Html::element( 'link', array(
3324                                 'rel' => 'shortcut icon',
3325                                 'href' => $wgFavicon
3326                         ) );
3327                 }
3328
3329                 # OpenSearch description link
3330                 $tags['opensearch'] = Html::element( 'link', array(
3331                         'rel' => 'search',
3332                         'type' => 'application/opensearchdescription+xml',
3333                         'href' => wfScript( 'opensearch_desc' ),
3334                         'title' => $this->msg( 'opensearch-desc' )->inContentLanguage()->text(),
3335                 ) );
3336
3337                 if ( $wgEnableAPI ) {
3338                         # Real Simple Discovery link, provides auto-discovery information
3339                         # for the MediaWiki API (and potentially additional custom API
3340                         # support such as WordPress or Twitter-compatible APIs for a
3341                         # blogging extension, etc)
3342                         $tags['rsd'] = Html::element( 'link', array(
3343                                 'rel' => 'EditURI',
3344                                 'type' => 'application/rsd+xml',
3345                                 // Output a protocol-relative URL here if $wgServer is protocol-relative
3346                                 // Whether RSD accepts relative or protocol-relative URLs is completely undocumented, though
3347                                 'href' => wfExpandUrl( wfAppendQuery(
3348                                         wfScript( 'api' ),
3349                                         array( 'action' => 'rsd' ) ),
3350                                         PROTO_RELATIVE
3351                                 ),
3352                         ) );
3353                 }
3354
3355                 # Language variants
3356                 if ( !$wgDisableLangConversion && $wgCanonicalLanguageLinks ) {
3357                         $lang = $this->getTitle()->getPageLanguage();
3358                         if ( $lang->hasVariants() ) {
3359
3360                                 $urlvar = $lang->getURLVariant();
3361
3362                                 if ( !$urlvar ) {
3363                                         $variants = $lang->getVariants();
3364                                         foreach ( $variants as $_v ) {
3365                                                 $tags["variant-$_v"] = Html::element( 'link', array(
3366                                                         'rel' => 'alternate',
3367                                                         'hreflang' => wfBCP47( $_v ),
3368                                                         'href' => $this->getTitle()->getLocalURL( array( 'variant' => $_v ) ) )
3369                                                 );
3370                                         }
3371                                 } else {
3372                                         $canonicalUrl = $this->getTitle()->getLocalURL();
3373                                 }
3374                         }
3375                 }
3376
3377                 # Copyright
3378                 $copyright = '';
3379                 if ( $wgRightsPage ) {
3380                         $copy = Title::newFromText( $wgRightsPage );
3381
3382                         if ( $copy ) {
3383                                 $copyright = $copy->getLocalURL();
3384                         }
3385                 }
3386
3387                 if ( !$copyright && $wgRightsUrl ) {
3388                         $copyright = $wgRightsUrl;
3389                 }
3390
3391                 if ( $copyright ) {
3392                         $tags['copyright'] = Html::element( 'link', array(
3393                                 'rel' => 'copyright',
3394                                 'href' => $copyright )
3395                         );
3396                 }
3397
3398                 # Feeds
3399                 if ( $wgFeed ) {
3400                         foreach ( $this->getSyndicationLinks() as $format => $link ) {
3401                                 # Use the page name for the title.  In principle, this could
3402                                 # lead to issues with having the same name for different feeds
3403                                 # corresponding to the same page, but we can't avoid that at
3404                                 # this low a level.
3405
3406                                 $tags[] = $this->feedLink(
3407                                         $format,
3408                                         $link,
3409                                         # Used messages: 'page-rss-feed' and 'page-atom-feed' (for an easier grep)
3410                                         $this->msg( "page-{$format}-feed", $this->getTitle()->getPrefixedText() )->text()
3411                                 );
3412                         }
3413
3414                         # Recent changes feed should appear on every page (except recentchanges,
3415                         # that would be redundant). Put it after the per-page feed to avoid
3416                         # changing existing behavior. It's still available, probably via a
3417                         # menu in your browser. Some sites might have a different feed they'd
3418                         # like to promote instead of the RC feed (maybe like a "Recent New Articles"
3419                         # or "Breaking news" one). For this, we see if $wgOverrideSiteFeed is defined.
3420                         # If so, use it instead.
3421                         if ( $wgOverrideSiteFeed ) {
3422                                 foreach ( $wgOverrideSiteFeed as $type => $feedUrl ) {
3423                                         // Note, this->feedLink escapes the url.
3424                                         $tags[] = $this->feedLink(
3425                                                 $type,
3426                                                 $feedUrl,
3427                                                 $this->msg( "site-{$type}-feed", $wgSitename )->text()
3428                                         );
3429                                 }
3430                         } elseif ( !$this->getTitle()->isSpecial( 'Recentchanges' ) ) {
3431                                 $rctitle = SpecialPage::getTitleFor( 'Recentchanges' );
3432                                 foreach ( $wgAdvertisedFeedTypes as $format ) {
3433                                         $tags[] = $this->feedLink(
3434                                                 $format,
3435                                                 $rctitle->getLocalURL( array( 'feed' => $format ) ),
3436                                                 # For grep: 'site-rss-feed', 'site-atom-feed'
3437                                                 $this->msg( "site-{$format}-feed", $wgSitename )->text()
3438                                         );
3439                                 }
3440                         }
3441                 }
3442
3443                 # Canonical URL
3444                 global $wgEnableCanonicalServerLink;
3445                 if ( $wgEnableCanonicalServerLink ) {
3446                         if ( $canonicalUrl !== false ) {
3447                                 $canonicalUrl = wfExpandUrl( $canonicalUrl, PROTO_CANONICAL );
3448                         } else {
3449                                 $reqUrl = $this->getRequest()->getRequestURL();
3450                                 $canonicalUrl = wfExpandUrl( $reqUrl, PROTO_CANONICAL );
3451                         }
3452                 }
3453                 if ( $canonicalUrl !== false ) {
3454                         $tags[] = Html::element( 'link', array(
3455                                 'rel' => 'canonical',
3456                                 'href' => $canonicalUrl
3457                         ) );
3458                 }
3459
3460                 return $tags;
3461         }
3462
3463         /**
3464          * @return string HTML tag links to be put in the header.
3465          * @deprecated since 1.24 Use OutputPage::headElement or if you have to,
3466          *   OutputPage::getHeadLinksArray directly.
3467          */
3468         public function getHeadLinks() {
3469                 wfDeprecated( __METHOD__, '1.24' );
3470                 return implode( "\n", $this->getHeadLinksArray() );
3471         }
3472
3473         /**
3474          * Generate a "<link rel/>" for a feed.
3475          *
3476          * @param string $type Feed type
3477          * @param string $url URL to the feed
3478          * @param string $text Value of the "title" attribute
3479          * @return string HTML fragment
3480          */
3481         private function feedLink( $type, $url, $text ) {
3482                 return Html::element( 'link', array(
3483                         'rel' => 'alternate',
3484                         'type' => "application/$type+xml",
3485                         'title' => $text,
3486                         'href' => $url )
3487                 );
3488         }
3489
3490         /**
3491          * Add a local or specified stylesheet, with the given media options.
3492          * Meant primarily for internal use...
3493          *
3494          * @param string $style URL to the file
3495          * @param string $media To specify a media type, 'screen', 'printable', 'handheld' or any.
3496          * @param string $condition For IE conditional comments, specifying an IE version
3497          * @param string $dir Set to 'rtl' or 'ltr' for direction-specific sheets
3498          */
3499         public function addStyle( $style, $media = '', $condition = '', $dir = '' ) {
3500                 $options = array();
3501                 // Even though we expect the media type to be lowercase, but here we
3502                 // force it to lowercase to be safe.
3503                 if ( $media ) {
3504                         $options['media'] = $media;
3505                 }
3506                 if ( $condition ) {
3507                         $options['condition'] = $condition;
3508                 }
3509                 if ( $dir ) {
3510                         $options['dir'] = $dir;
3511                 }
3512                 $this->styles[$style] = $options;
3513         }
3514
3515         /**
3516          * Adds inline CSS styles
3517          * @param mixed $style_css Inline CSS
3518          * @param string $flip Set to 'flip' to flip the CSS if needed
3519          */
3520         public function addInlineStyle( $style_css, $flip = 'noflip' ) {
3521                 if ( $flip === 'flip' && $this->getLanguage()->isRTL() ) {
3522                         # If wanted, and the interface is right-to-left, flip the CSS
3523                         $style_css = CSSJanus::transform( $style_css, true, false );
3524                 }
3525                 $this->mInlineStyles .= Html::inlineStyle( $style_css ) . "\n";
3526         }
3527
3528         /**
3529          * Build a set of "<link>" elements for the stylesheets specified in the $this->styles array.
3530          * These will be applied to various media & IE conditionals.
3531          *
3532          * @return string
3533          */
3534         public function buildCssLinks() {
3535                 global $wgAllowUserCss, $wgContLang;
3536
3537                 $this->getSkin()->setupSkinUserCss( $this );
3538
3539                 // Add ResourceLoader styles
3540                 // Split the styles into these groups
3541                 $styles = array(
3542                         'other' => array(),
3543                         'user' => array(),
3544                         'site' => array(),
3545                         'private' => array(),
3546                         'noscript' => array()
3547                 );
3548                 $links = array();
3549                 $otherTags = ''; // Tags to append after the normal <link> tags
3550                 $resourceLoader = $this->getResourceLoader();
3551
3552                 $moduleStyles = $this->getModuleStyles();
3553
3554                 // Per-site custom styles
3555                 $moduleStyles[] = 'site';
3556                 $moduleStyles[] = 'noscript';
3557                 $moduleStyles[] = 'user.groups';
3558
3559                 // Per-user custom styles
3560                 if ( $wgAllowUserCss && $this->getTitle()->isCssSubpage() && $this->userCanPreview() ) {
3561                         // We're on a preview of a CSS subpage
3562                         // Exclude this page from the user module in case it's in there (bug 26283)
3563                         $link = $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_STYLES, false,
3564                                 array( 'excludepage' => $this->getTitle()->getPrefixedDBkey() )
3565                         );
3566                         $otherTags .= $link['html'];
3567
3568                         // Load the previewed CSS
3569                         // If needed, Janus it first. This is user-supplied CSS, so it's
3570                         // assumed to be right for the content language directionality.
3571                         $previewedCSS = $this->getRequest()->getText( 'wpTextbox1' );
3572                         if ( $this->getLanguage()->getDir() !== $wgContLang->getDir() ) {
3573                                 $previewedCSS = CSSJanus::transform( $previewedCSS, true, false );
3574                         }
3575                         $otherTags .= Html::inlineStyle( $previewedCSS ) . "\n";
3576                 } else {
3577                         // Load the user styles normally
3578                         $moduleStyles[] = 'user';
3579                 }
3580
3581                 // Per-user preference styles
3582                 $moduleStyles[] = 'user.cssprefs';
3583
3584                 foreach ( $moduleStyles as $name ) {
3585                         $module = $resourceLoader->getModule( $name );
3586                         if ( !$module ) {
3587                                 continue;
3588                         }
3589                         $group = $module->getGroup();
3590                         // Modules in groups different than the ones listed on top (see $styles assignment)
3591                         // will be placed in the "other" group
3592                         $styles[isset( $styles[$group] ) ? $group : 'other'][] = $name;
3593                 }
3594
3595                 // We want site, private and user styles to override dynamically added
3596                 // styles from modules, but we want dynamically added styles to override
3597                 // statically added styles from other modules. So the order has to be
3598                 // other, dynamic, site, private, user. Add statically added styles for
3599                 // other modules
3600                 $links[] = $this->makeResourceLoaderLink( $styles['other'], ResourceLoaderModule::TYPE_STYLES );
3601                 // Add normal styles added through addStyle()/addInlineStyle() here
3602                 $links[] = implode( "\n", $this->buildCssLinksArray() ) . $this->mInlineStyles;
3603                 // Add marker tag to mark the place where the client-side loader should inject dynamic styles
3604                 // We use a <meta> tag with a made-up name for this because that's valid HTML
3605                 $links[] = Html::element(
3606                         'meta',
3607                         array( 'name' => 'ResourceLoaderDynamicStyles', 'content' => '' )
3608                 ) . "\n";
3609
3610                 // Add site, private and user styles
3611                 // 'private' at present only contains user.options, so put that before 'user'
3612                 // Any future private modules will likely have a similar user-specific character
3613                 foreach ( array( 'site', 'noscript', 'private', 'user' ) as $group ) {
3614                         $links[] = $this->makeResourceLoaderLink( $styles[$group],
3615                                 ResourceLoaderModule::TYPE_STYLES
3616                         );
3617                 }
3618
3619                 // Add stuff in $otherTags (previewed user CSS if applicable)
3620                 return self::getHtmlFromLoaderLinks( $links ) . $otherTags;
3621         }
3622
3623         /**
3624          * @return array
3625          */
3626         public function buildCssLinksArray() {
3627                 $links = array();
3628
3629                 // Add any extension CSS
3630                 foreach ( $this->mExtStyles as $url ) {
3631                         $this->addStyle( $url );
3632                 }
3633                 $this->mExtStyles = array();
3634
3635                 foreach ( $this->styles as $file => $options ) {
3636                         $link = $this->styleLink( $file, $options );
3637                         if ( $link ) {
3638                                 $links[$file] = $link;
3639                         }
3640                 }
3641                 return $links;
3642         }
3643
3644         /**
3645          * Generate \<link\> tags for stylesheets
3646          *
3647          * @param string $style URL to the file
3648          * @param array $options Option, can contain 'condition', 'dir', 'media' keys
3649          * @return string HTML fragment
3650          */
3651         protected function styleLink( $style, array $options ) {
3652                 if ( isset( $options['dir'] ) ) {
3653                         if ( $this->getLanguage()->getDir() != $options['dir'] ) {
3654                                 return '';
3655                         }
3656                 }
3657
3658                 if ( isset( $options['media'] ) ) {
3659                         $media = self::transformCssMedia( $options['media'] );
3660                         if ( is_null( $media ) ) {
3661                                 return '';
3662                         }
3663                 } else {
3664                         $media = 'all';
3665                 }
3666
3667                 if ( substr( $style, 0, 1 ) == '/' ||
3668                         substr( $style, 0, 5 ) == 'http:' ||
3669                         substr( $style, 0, 6 ) == 'https:' ) {
3670                         $url = $style;
3671                 } else {
3672                         global $wgStylePath, $wgStyleVersion;
3673                         $url = $wgStylePath . '/' . $style . '?' . $wgStyleVersion;
3674                 }
3675
3676                 $link = Html::linkedStyle( $url, $media );
3677
3678                 if ( isset( $options['condition'] ) ) {
3679                         $condition = htmlspecialchars( $options['condition'] );
3680                         $link = "<!--[if $condition]>$link<![endif]-->";
3681                 }
3682                 return $link;
3683         }
3684
3685         /**
3686          * Transform "media" attribute based on request parameters
3687          *
3688          * @param string $media Current value of the "media" attribute
3689          * @return string Modified value of the "media" attribute, or null to skip
3690          * this stylesheet
3691          */
3692         public static function transformCssMedia( $media ) {
3693                 global $wgRequest;
3694
3695                 // http://www.w3.org/TR/css3-mediaqueries/#syntax
3696                 $screenMediaQueryRegex = '/^(?:only\s+)?screen\b/i';
3697
3698                 // Switch in on-screen display for media testing
3699                 $switches = array(
3700                         'printable' => 'print',
3701                         'handheld' => 'handheld',
3702                 );
3703                 foreach ( $switches as $switch => $targetMedia ) {
3704                         if ( $wgRequest->getBool( $switch ) ) {
3705                                 if ( $media == $targetMedia ) {
3706                                         $media = '';
3707                                 } elseif ( preg_match( $screenMediaQueryRegex, $media ) === 1 ) {
3708                                         // This regex will not attempt to understand a comma-separated media_query_list
3709                                         //
3710                                         // Example supported values for $media:
3711                                         // 'screen', 'only screen', 'screen and (min-width: 982px)' ),
3712                                         // Example NOT supported value for $media:
3713                                         // '3d-glasses, screen, print and resolution > 90dpi'
3714                                         //
3715                                         // If it's a print request, we never want any kind of screen stylesheets
3716                                         // If it's a handheld request (currently the only other choice with a switch),
3717                                         // we don't want simple 'screen' but we might want screen queries that
3718                                         // have a max-width or something, so we'll pass all others on and let the
3719                                         // client do the query.
3720                                         if ( $targetMedia == 'print' || $media == 'screen' ) {
3721                                                 return null;
3722                                         }
3723                                 }
3724                         }
3725                 }
3726
3727                 return $media;
3728         }
3729
3730         /**
3731          * Add a wikitext-formatted message to the output.
3732          * This is equivalent to:
3733          *
3734          *    $wgOut->addWikiText( wfMessage( ... )->plain() )
3735          */
3736         public function addWikiMsg( /*...*/ ) {
3737                 $args = func_get_args();
3738                 $name = array_shift( $args );
3739                 $this->addWikiMsgArray( $name, $args );
3740         }
3741
3742         /**
3743          * Add a wikitext-formatted message to the output.
3744          * Like addWikiMsg() except the parameters are taken as an array
3745          * instead of a variable argument list.
3746          *
3747          * @param string $name
3748          * @param array $args
3749          */
3750         public function addWikiMsgArray( $name, $args ) {
3751                 $this->addHTML( $this->msg( $name, $args )->parseAsBlock() );
3752         }
3753
3754         /**
3755          * This function takes a number of message/argument specifications, wraps them in
3756          * some overall structure, and then parses the result and adds it to the output.
3757          *
3758          * In the $wrap, $1 is replaced with the first message, $2 with the second, and so
3759          * on. The subsequent arguments may either be strings, in which case they are the
3760          * message names, or arrays, in which case the first element is the message name,
3761          * and subsequent elements are the parameters to that message.
3762          *
3763          * Don't use this for messages that are not in users interface language.
3764          *
3765          * For example:
3766          *
3767          *    $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>", 'some-error' );
3768          *
3769          * Is equivalent to:
3770          *
3771          *    $wgOut->addWikiText( "<div class='error'>\n"
3772          *        . wfMessage( 'some-error' )->plain() . "\n</div>" );
3773          *
3774          * The newline after opening div is needed in some wikitext. See bug 19226.
3775          *
3776          * @param string $wrap
3777          */
3778         public function wrapWikiMsg( $wrap /*, ...*/ ) {
3779                 $msgSpecs = func_get_args();
3780                 array_shift( $msgSpecs );
3781                 $msgSpecs = array_values( $msgSpecs );
3782                 $s = $wrap;
3783                 foreach ( $msgSpecs as $n => $spec ) {
3784                         if ( is_array( $spec ) ) {
3785                                 $args = $spec;
3786                                 $name = array_shift( $args );
3787                                 if ( isset( $args['options'] ) ) {
3788                                         unset( $args['options'] );
3789                                         wfDeprecated(
3790                                                 'Adding "options" to ' . __METHOD__ . ' is no longer supported',
3791                                                 '1.20'
3792                                         );
3793                                 }
3794                         } else {
3795                                 $args = array();
3796                                 $name = $spec;
3797                         }
3798                         $s = str_replace( '$' . ( $n + 1 ), $this->msg( $name, $args )->plain(), $s );
3799                 }
3800                 $this->addWikiText( $s );
3801         }
3802
3803         /**
3804          * Include jQuery core. Use this to avoid loading it multiple times
3805          * before we get a usable script loader.
3806          *
3807          * @param array $modules List of jQuery modules which should be loaded
3808          * @return array The list of modules which were not loaded.
3809          * @since 1.16
3810          * @deprecated since 1.17
3811          */
3812         public function includeJQuery( array $modules = array() ) {
3813                 return array();
3814         }
3815
3816         /**
3817          * Enables/disables TOC, doesn't override __NOTOC__
3818          * @param bool $flag
3819          * @since 1.22
3820          */
3821         public function enableTOC( $flag = true ) {
3822                 $this->mEnableTOC = $flag;
3823         }
3824
3825         /**
3826          * @return bool
3827          * @since 1.22
3828          */
3829         public function isTOCEnabled() {
3830                 return $this->mEnableTOC;
3831         }
3832
3833         /**
3834          * Enables/disables section edit links, doesn't override __NOEDITSECTION__
3835          * @param bool $flag
3836          * @since 1.23
3837          */
3838         public function enableSectionEditLinks( $flag = true ) {
3839                 $this->mEnableSectionEditLinks = $flag;
3840         }
3841
3842         /**
3843          * @return bool
3844          * @since 1.23
3845          */
3846         public function sectionEditLinksEnabled() {
3847                 return $this->mEnableSectionEditLinks;
3848         }
3849 }