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 */
 126         protected $mIndicators = array();
 127
 128         /** @var array Array of Interwiki Prefixed (non DB key) Titles (e.g. 'fr:Test page') */
 129         private $mLanguageLinks = array();
 130
 131         /**
 132          * Used for JavaScript (pre resource loader)
 133          * @todo We should split JS / CSS.
 134          * mScripts content is inserted as is in "<head>" by Skin. This might
 135          * contain either a link to a stylesheet or inline CSS.
 136          */
 137         private $mScripts = '';
 138
 139         /** @var string Inline CSS styles. Use addInlineStyle() sparingly */
 140         protected $mInlineStyles = '';
 141
 142         /** @todo Unused? */
 143         private $mLinkColours;
 144
 145         /**
 146          * @var string Used by skin template.
 147          * Example: $tpl->set( 'displaytitle', $out->mPageLinkTitle );
 148          */
 149         public $mPageLinkTitle = '';
 150
 151         /** @var array Array of elements in "<head>". Parser might add its own headers! */
 152         protected $mHeadItems = array();
 153
 154         // @todo FIXME: Next 5 variables probably come from the resource loader
 155
 156         /** @var array */
 157         protected $mModules = array();
 158
 159         /** @var array */
 160         protected $mModuleScripts = array();
 161
 162         /** @var array */
 163         protected $mModuleStyles = array();
 164
 165         /** @var array */
 166         protected $mModuleMessages = array();
 167
 168         /** @var ResourceLoader */
 169         protected $mResourceLoader;
 170
 171         /** @var array */
 172         protected $mJsConfigVars = array();
 173
 174         /** @var array */
 175         protected $mTemplateIds = array();
 176
 177         /** @var array */
 178         protected $mImageTimeKeys = array();
 179
 180         /** @var string */
 181         public $mRedirectCode = '';
 182
 183         protected $mFeedLinksAppendQuery = null;
 184
 185         /** @var array
 186          * What level of 'untrustworthiness' is allowed in CSS/JS modules loaded on this page?
 187          * @see ResourceLoaderModule::$origin
 188          * ResourceLoaderModule::ORIGIN_ALL is assumed unless overridden;
 189          */
 190         protected $mAllowedModules = array(
 191                 ResourceLoaderModule::TYPE_COMBINED => ResourceLoaderModule::ORIGIN_ALL,
 192         );
 193
 194         /** @var bool Whether output is disabled.  If this is true, the 'output' method will do nothing. */
 195         protected $mDoNothing = false;
 196
 197         // Parser related.
 198
 199         /**
 200          * @var int
 201          * @todo Unused?
 202          */
 203         private $mContainsOldMagic = 0;
 204
 205         /** @var int */
 206         protected $mContainsNewMagic = 0;
 207
 208         /**
 209          * lazy initialised, use parserOptions()
 210          * @var ParserOptions
 211          */
 212         protected $mParserOptions = null;
 213
 214         /**
 215          * Handles the Atom / RSS links.
 216          * We probably only support Atom in 2011.
 217          * @see $wgAdvertisedFeedTypes
 218          */
 219         private $mFeedLinks = array();
 220
 221         // Gwicke work on squid caching? Roughly from 2003.
 222         protected $mEnableClientCache = true;
 223
 224         /** @var bool Flag if output should only contain the body of the article. */
 225         private $mArticleBodyOnly = false;
 226
 227         /** @var bool */
 228         protected $mNewSectionLink = false;
 229
 230         /** @var bool */
 231         protected $mHideNewSectionLink = false;
 232
 233         /**
 234          * @var bool Comes from the parser. This was probably made to load CSS/JS
 235          * only if we had "<gallery>". Used directly in CategoryPage.php.
 236          * Looks like resource loader can replace this.
 237          */
 238         public $mNoGallery = false;
 239
 240         /** @var string */
 241         private $mPageTitleActionText = '';
 242
 243         /** @var array */
 244         private $mParseWarnings = array();
 245
 246         /** @var int Cache stuff. Looks like mEnableClientCache */
 247         protected $mSquidMaxage = 0;
 248
 249         /**
 250          * @var bool
 251          * @todo Document
 252          */
 253         protected $mPreventClickjacking = true;
 254
 255         /** @var int To include the variable {{REVISIONID}} */
 256         private $mRevisionId = null;
 257
 258         /** @var string */
 259         private $mRevisionTimestamp = null;
 260
 261         /** @var array */
 262         protected $mFileVersion = null;
 263
 264         /**
 265          * @var array An array of stylesheet filenames (relative from skins path),
 266          * with options for CSS media, IE conditions, and RTL/LTR direction.
 267          * For internal use; add settings in the skin via $this->addStyle()
 268          *
 269          * Style again! This seems like a code duplication since we already have
 270          * mStyles. This is what makes Open Source amazing.
 271          */
 272         protected $styles = array();
 273
 274         /**
 275          * Whether jQuery is already handled.
 276          */
 277         protected $mJQueryDone = false;
 278
 279         private $mIndexPolicy = 'index';
 280         private $mFollowPolicy = 'follow';
 281         private $mVaryHeader = array(
 282                 'Accept-Encoding' => array( 'list-contains=gzip' ),
 283         );
 284
 285         /**
 286          * If the current page was reached through a redirect, $mRedirectedFrom contains the Title
 287          * of the redirect.
 288          *
 289          * @var Title
 290          */
 291         private $mRedirectedFrom = null;
 292
 293         /**
 294          * Additional key => value data
 295          */
 296         private $mProperties = array();
 297
 298         /**
 299          * @var string|null ResourceLoader target for load.php links. If null, will be omitted
 300          */
 301         private $mTarget = null;
 302
 303         /**
 304          * @var bool Whether parser output should contain table of contents
 305          */
 306         private $mEnableTOC = true;
 307
 308         /**
 309          * @var bool Whether parser output should contain section edit links
 310          */
 311         private $mEnableSectionEditLinks = true;
 312
 313         /**
 314          * Constructor for OutputPage. This should not be called directly.
 315          * Instead a new RequestContext should be created and it will implicitly create
 316          * a OutputPage tied to that context.
 317          * @param IContextSource|null $context
 318          */
 319         function __construct( IContextSource $context = null ) {
 320                 if ( $context === null ) {
 321                         # Extensions should use `new RequestContext` instead of `new OutputPage` now.
 322                         wfDeprecated( __METHOD__, '1.18' );
 323                 } else {
 324                         $this->setContext( $context );
 325                 }
 326         }
 327
 328         /**
 329          * Redirect to $url rather than displaying the normal page
 330          *
 331          * @param string $url URL
 332          * @param string $responsecode HTTP status code
 333          */
 334         public function redirect( $url, $responsecode = '302' ) {
 335                 # Strip newlines as a paranoia check for header injection in PHP<5.1.2
 336                 $this->mRedirect = str_replace( "\n", '', $url );
 337                 $this->mRedirectCode = $responsecode;
 338         }
 339
 340         /**
 341          * Get the URL to redirect to, or an empty string if not redirect URL set
 342          *
 343          * @return string
 344          */
 345         public function getRedirect() {
 346                 return $this->mRedirect;
 347         }
 348
 349         /**
 350          * Set the HTTP status code to send with the output.
 351          *
 352          * @param int $statusCode
 353          */
 354         public function setStatusCode( $statusCode ) {
 355                 $this->mStatusCode = $statusCode;
 356         }
 357
 358         /**
 359          * Add a new "<meta>" tag
 360          * To add an http-equiv meta tag, precede the name with "http:"
 361          *
 362          * @param string $name Tag name
 363          * @param string $val Tag value
 364          */
 365         function addMeta( $name, $val ) {
 366                 array_push( $this->mMetatags, array( $name, $val ) );
 367         }
 368
 369         /**
 370          * Add a new \<link\> tag to the page header.
 371          *
 372          * Note: use setCanonicalUrl() for rel=canonical.
 373          *
 374          * @param array $linkarr Associative array of attributes.
 375          */
 376         function addLink( array $linkarr ) {
 377                 array_push( $this->mLinktags, $linkarr );
 378         }
 379
 380         /**
 381          * Add a new \<link\> with "rel" attribute set to "meta"
 382          *
 383          * @param array $linkarr Associative array mapping attribute names to their
 384          *                 values, both keys and values will be escaped, and the
 385          *                 "rel" attribute will be automatically added
 386          */
 387         function addMetadataLink( array $linkarr ) {
 388                 $linkarr['rel'] = $this->getMetadataAttribute();
 389                 $this->addLink( $linkarr );
 390         }
 391
 392         /**
 393          * Set the URL to be used for the <link rel=canonical>. This should be used
 394          * in preference to addLink(), to avoid duplicate link tags.
 395          * @param string $url
 396          */
 397         function setCanonicalUrl( $url ) {
 398                 $this->mCanonicalUrl = $url;
 399         }
 400
 401         /**
 402          * Get the value of the "rel" attribute for metadata links
 403          *
 404          * @return string
 405          */
 406         public function getMetadataAttribute() {
 407                 # note: buggy CC software only reads first "meta" link
 408                 static $haveMeta = false;
 409                 if ( $haveMeta ) {
 410                         return 'alternate meta';
 411                 } else {
 412                         $haveMeta = true;
 413                         return 'meta';
 414                 }
 415         }
 416
 417         /**
 418          * Add raw HTML to the list of scripts (including \<script\> tag, etc.)
 419          *
 420          * @param string $script Raw HTML
 421          */
 422         function addScript( $script ) {
 423                 $this->mScripts .= $script . "\n";
 424         }
 425
 426         /**
 427          * Register and add a stylesheet from an extension directory.
 428          *
 429          * @param string $url Path to sheet.  Provide either a full url (beginning
 430          *             with 'http', etc) or a relative path from the document root
 431          *             (beginning with '/').  Otherwise it behaves identically to
 432          *             addStyle() and draws from the /skins folder.
 433          */
 434         public function addExtensionStyle( $url ) {
 435                 array_push( $this->mExtStyles, $url );
 436         }
 437
 438         /**
 439          * Get all styles added by extensions
 440          *
 441          * @return array
 442          */
 443         function getExtStyle() {
 444                 return $this->mExtStyles;
 445         }
 446
 447         /**
 448          * Add a JavaScript file out of skins/common, or a given relative path.
 449          *
 450          * @param string $file Filename in skins/common or complete on-server path
 451          *              (/foo/bar.js)
 452          * @param string $version Style version of the file. Defaults to $wgStyleVersion
 453          */
 454         public function addScriptFile( $file, $version = null ) {
 455                 // See if $file parameter is an absolute URL or begins with a slash
 456                 if ( substr( $file, 0, 1 ) == '/' || preg_match( '#^[a-z]*://#i', $file ) ) {
 457                         $path = $file;
 458                 } else {
 459                         $path = $this->getConfig()->get( 'StylePath' ) . "/common/{$file}";
 460                 }
 461                 if ( is_null( $version ) ) {
 462                         $version = $this->getConfig()->get( 'StyleVersion' );
 463                 }
 464                 $this->addScript( Html::linkedScript( wfAppendQuery( $path, $version ) ) );
 465         }
 466
 467         /**
 468          * Add a self-contained script tag with the given contents
 469          *
 470          * @param string $script JavaScript text, no "<script>" tags
 471          */
 472         public function addInlineScript( $script ) {
 473                 $this->mScripts .= Html::inlineScript( "\n$script\n" ) . "\n";
 474         }
 475
 476         /**
 477          * Get all registered JS and CSS tags for the header.
 478          *
 479          * @return string
 480          * @deprecated since 1.24 Use OutputPage::headElement to build the full header.
 481          */
 482         function getScript() {
 483                 wfDeprecated( __METHOD__, '1.24' );
 484                 return $this->mScripts . $this->getHeadItems();
 485         }
 486
 487         /**
 488          * Filter an array of modules to remove insufficiently trustworthy members, and modules
 489          * which are no longer registered (eg a page is cached before an extension is disabled)
 490          * @param array $modules
 491          * @param string|null $position If not null, only return modules with this position
 492          * @param string $type
 493          * @return array
 494          */
 495         protected function filterModules( array $modules, $position = null,
 496                 $type = ResourceLoaderModule::TYPE_COMBINED
 497         ) {
 498                 $resourceLoader = $this->getResourceLoader();
 499                 $filteredModules = array();
 500                 foreach ( $modules as $val ) {
 501                         $module = $resourceLoader->getModule( $val );
 502                         if ( $module instanceof ResourceLoaderModule
 503                                 && $module->getOrigin() <= $this->getAllowedModules( $type )
 504                                 && ( is_null( $position ) || $module->getPosition() == $position )
 505                                 && ( !$this->mTarget || in_array( $this->mTarget, $module->getTargets() ) )
 506                         ) {
 507                                 $filteredModules[] = $val;
 508                         }
 509                 }
 510                 return $filteredModules;
 511         }
 512
 513         /**
 514          * Get the list of modules to include on this page
 515          *
 516          * @param bool $filter Whether to filter out insufficiently trustworthy modules
 517          * @param string|null $position If not null, only return modules with this position
 518          * @param string $param
 519          * @return array Array of module names
 520          */
 521         public function getModules( $filter = false, $position = null, $param = 'mModules' ) {
 522                 $modules = array_values( array_unique( $this->$param ) );
 523                 return $filter
 524                         ? $this->filterModules( $modules, $position )
 525                         : $modules;
 526         }
 527
 528         /**
 529          * Add one or more modules recognized by the resource loader. Modules added
 530          * through this function will be loaded by the resource loader when the
 531          * page loads.
 532          *
 533          * @param string|array $modules Module name (string) or array of module names
 534          */
 535         public function addModules( $modules ) {
 536                 $this->mModules = array_merge( $this->mModules, (array)$modules );
 537         }
 538
 539         /**
 540          * Get the list of module JS to include on this page
 541          *
 542          * @param bool $filter
 543          * @param string|null $position
 544          *
 545          * @return array Array of module names
 546          */
 547         public function getModuleScripts( $filter = false, $position = null ) {
 548                 return $this->getModules( $filter, $position, 'mModuleScripts' );
 549         }
 550
 551         /**
 552          * Add only JS of one or more modules recognized by the resource loader. Module
 553          * scripts added through this function will be loaded by the resource loader when
 554          * the page loads.
 555          *
 556          * @param string|array $modules Module name (string) or array of module names
 557          */
 558         public function addModuleScripts( $modules ) {
 559                 $this->mModuleScripts = array_merge( $this->mModuleScripts, (array)$modules );
 560         }
 561
 562         /**
 563          * Get the list of module CSS to include on this page
 564          *
 565          * @param bool $filter
 566          * @param string|null $position
 567          *
 568          * @return array Array of module names
 569          */
 570         public function getModuleStyles( $filter = false, $position = null ) {
 571                 return $this->getModules( $filter, $position, 'mModuleStyles' );
 572         }
 573
 574         /**
 575          * Add only CSS of one or more modules recognized by the resource loader.
 576          *
 577          * Module styles added through this function will be added using standard link CSS
 578          * tags, rather than as a combined Javascript and CSS package. Thus, they will
 579          * load when JavaScript is disabled (unless CSS also happens to be disabled).
 580          *
 581          * @param string|array $modules Module name (string) or array of module names
 582          */
 583         public function addModuleStyles( $modules ) {
 584                 $this->mModuleStyles = array_merge( $this->mModuleStyles, (array)$modules );
 585         }
 586
 587         /**
 588          * Get the list of module messages to include on this page
 589          *
 590          * @param bool $filter
 591          * @param string|null $position
 592          *
 593          * @return array Array of module names
 594          */
 595         public function getModuleMessages( $filter = false, $position = null ) {
 596                 return $this->getModules( $filter, $position, 'mModuleMessages' );
 597         }
 598
 599         /**
 600          * Add only messages of one or more modules recognized by the resource loader.
 601          * Module messages added through this function will be loaded by the resource
 602          * loader when the page loads.
 603          *
 604          * @param string|array $modules Module name (string) or array of module names
 605          */
 606         public function addModuleMessages( $modules ) {
 607                 $this->mModuleMessages = array_merge( $this->mModuleMessages, (array)$modules );
 608         }
 609
 610         /**
 611          * @return null|string ResourceLoader target
 612          */
 613         public function getTarget() {
 614                 return $this->mTarget;
 615         }
 616
 617         /**
 618          * Sets ResourceLoader target for load.php links. If null, will be omitted
 619          *
 620          * @param string|null $target
 621          */
 622         public function setTarget( $target ) {
 623                 $this->mTarget = $target;
 624         }
 625
 626         /**
 627          * Get an array of head items
 628          *
 629          * @return array
 630          */
 631         function getHeadItemsArray() {
 632                 return $this->mHeadItems;
 633         }
 634
 635         /**
 636          * Get all header items in a string
 637          *
 638          * @return string
 639          * @deprecated since 1.24 Use OutputPage::headElement or
 640          *   if absolutely necessary use OutputPage::getHeadItemsArray
 641          */
 642         function getHeadItems() {
 643                 wfDeprecated( __METHOD__, '1.24' );
 644                 $s = '';
 645                 foreach ( $this->mHeadItems as $item ) {
 646                         $s .= $item;
 647                 }
 648                 return $s;
 649         }
 650
 651         /**
 652          * Add or replace an header item to the output
 653          *
 654          * @param string $name Item name
 655          * @param string $value Raw HTML
 656          */
 657         public function addHeadItem( $name, $value ) {
 658                 $this->mHeadItems[$name] = $value;
 659         }
 660
 661         /**
 662          * Check if the header item $name is already set
 663          *
 664          * @param string $name Item name
 665          * @return bool
 666          */
 667         public function hasHeadItem( $name ) {
 668                 return isset( $this->mHeadItems[$name] );
 669         }
 670
 671         /**
 672          * Set the value of the ETag HTTP header, only used if $wgUseETag is true
 673          *
 674          * @param string $tag Value of "ETag" header
 675          */
 676         function setETag( $tag ) {
 677                 $this->mETag = $tag;
 678         }
 679
 680         /**
 681          * Set whether the output should only contain the body of the article,
 682          * without any skin, sidebar, etc.
 683          * Used e.g. when calling with "action=render".
 684          *
 685          * @param bool $only Whether to output only the body of the article
 686          */
 687         public function setArticleBodyOnly( $only ) {
 688                 $this->mArticleBodyOnly = $only;
 689         }
 690
 691         /**
 692          * Return whether the output will contain only the body of the article
 693          *
 694          * @return bool
 695          */
 696         public function getArticleBodyOnly() {
 697                 return $this->mArticleBodyOnly;
 698         }
 699
 700         /**
 701          * Set an additional output property
 702          * @since 1.21
 703          *
 704          * @param string $name
 705          * @param mixed $value
 706          */
 707         public function setProperty( $name, $value ) {
 708                 $this->mProperties[$name] = $value;
 709         }
 710
 711         /**
 712          * Get an additional output property
 713          * @since 1.21
 714          *
 715          * @param string $name
 716          * @return mixed Property value or null if not found
 717          */
 718         public function getProperty( $name ) {
 719                 if ( isset( $this->mProperties[$name] ) ) {
 720                         return $this->mProperties[$name];
 721                 } else {
 722                         return null;
 723                 }
 724         }
 725
 726         /**
 727          * checkLastModified tells the client to use the client-cached page if
 728          * possible. If successful, the OutputPage is disabled so that
 729          * any future call to OutputPage->output() have no effect.
 730          *
 731          * Side effect: sets mLastModified for Last-Modified header
 732          *
 733          * @param string $timestamp
 734          *
 735          * @return bool True if cache-ok headers was sent.
 736          */
 737         public function checkLastModified( $timestamp ) {
 738                 if ( !$timestamp || $timestamp == '19700101000000' ) {
 739                         wfDebug( __METHOD__ . ": CACHE DISABLED, NO TIMESTAMP\n" );
 740                         return false;
 741                 }
 742                 $config = $this->getConfig();
 743                 if ( !$config->get( 'CachePages' ) ) {
 744                         wfDebug( __METHOD__ . ": CACHE DISABLED\n" );
 745                         return false;
 746                 }
 747
 748                 $timestamp = wfTimestamp( TS_MW, $timestamp );
 749                 $modifiedTimes = array(
 750                         'page' => $timestamp,
 751                         'user' => $this->getUser()->getTouched(),
 752                         'epoch' => $config->get( 'CacheEpoch' )
 753                 );
 754                 if ( $config->get( 'UseSquid' ) ) {
 755                         // bug 44570: the core page itself may not change, but resources might
 756                         $modifiedTimes['sepoch'] = wfTimestamp( TS_MW, time() - $config->get( 'SquidMaxage' ) );
 757                 }
 758                 wfRunHooks( 'OutputPageCheckLastModified', array( &$modifiedTimes ) );
 759
 760                 $maxModified = max( $modifiedTimes );
 761                 $this->mLastModified = wfTimestamp( TS_RFC2822, $maxModified );
 762
 763                 $clientHeader = $this->getRequest()->getHeader( 'If-Modified-Since' );
 764                 if ( $clientHeader === false ) {
 765                         wfDebug( __METHOD__ . ": client did not send If-Modified-Since header\n", 'log' );
 766                         return false;
 767                 }
 768
 769                 # IE sends sizes after the date like this:
 770                 # Wed, 20 Aug 2003 06:51:19 GMT; length=5202
 771                 # this breaks strtotime().
 772                 $clientHeader = preg_replace( '/;.*$/', '', $clientHeader );
 773
 774                 wfSuppressWarnings(); // E_STRICT system time bitching
 775                 $clientHeaderTime = strtotime( $clientHeader );
 776                 wfRestoreWarnings();
 777                 if ( !$clientHeaderTime ) {
 778                         wfDebug( __METHOD__
 779                                 . ": unable to parse the client's If-Modified-Since header: $clientHeader\n" );
 780                         return false;
 781                 }
 782                 $clientHeaderTime = wfTimestamp( TS_MW, $clientHeaderTime );
 783
 784                 # Make debug info
 785                 $info = '';
 786                 foreach ( $modifiedTimes as $name => $value ) {
 787                         if ( $info !== '' ) {
 788                                 $info .= ', ';
 789                         }
 790                         $info .= "$name=" . wfTimestamp( TS_ISO_8601, $value );
 791                 }
 792
 793                 wfDebug( __METHOD__ . ": client sent If-Modified-Since: " .
 794                         wfTimestamp( TS_ISO_8601, $clientHeaderTime ) . "\n", 'log' );
 795                 wfDebug( __METHOD__ . ": effective Last-Modified: " .
 796                         wfTimestamp( TS_ISO_8601, $maxModified ) . "\n", 'log' );
 797                 if ( $clientHeaderTime < $maxModified ) {
 798                         wfDebug( __METHOD__ . ": STALE, $info\n", 'log' );
 799                         return false;
 800                 }
 801
 802                 # Not modified
 803                 # Give a 304 response code and disable body output
 804                 wfDebug( __METHOD__ . ": NOT MODIFIED, $info\n", 'log' );
 805                 ini_set( 'zlib.output_compression', 0 );
 806                 $this->getRequest()->response()->header( "HTTP/1.1 304 Not Modified" );
 807                 $this->sendCacheControl();
 808                 $this->disable();
 809
 810                 // Don't output a compressed blob when using ob_gzhandler;
 811                 // it's technically against HTTP spec and seems to confuse
 812                 // Firefox when the response gets split over two packets.
 813                 wfClearOutputBuffers();
 814
 815                 return true;
 816         }
 817
 818         /**
 819          * Override the last modified timestamp
 820          *
 821          * @param string $timestamp New timestamp, in a format readable by
 822          *        wfTimestamp()
 823          */
 824         public function setLastModified( $timestamp ) {
 825                 $this->mLastModified = wfTimestamp( TS_RFC2822, $timestamp );
 826         }
 827
 828         /**
 829          * Set the robot policy for the page: <http://www.robotstxt.org/meta.html>
 830          *
 831          * @param string $policy The literal string to output as the contents of
 832          *   the meta tag.  Will be parsed according to the spec and output in
 833          *   standardized form.
 834          * @return null
 835          */
 836         public function setRobotPolicy( $policy ) {
 837                 $policy = Article::formatRobotPolicy( $policy );
 838
 839                 if ( isset( $policy['index'] ) ) {
 840                         $this->setIndexPolicy( $policy['index'] );
 841                 }
 842                 if ( isset( $policy['follow'] ) ) {
 843                         $this->setFollowPolicy( $policy['follow'] );
 844                 }
 845         }
 846
 847         /**
 848          * Set the index policy for the page, but leave the follow policy un-
 849          * touched.
 850          *
 851          * @param string $policy Either 'index' or 'noindex'.
 852          * @return null
 853          */
 854         public function setIndexPolicy( $policy ) {
 855                 $policy = trim( $policy );
 856                 if ( in_array( $policy, array( 'index', 'noindex' ) ) ) {
 857                         $this->mIndexPolicy = $policy;
 858                 }
 859         }
 860
 861         /**
 862          * Set the follow policy for the page, but leave the index policy un-
 863          * touched.
 864          *
 865          * @param string $policy Either 'follow' or 'nofollow'.
 866          * @return null
 867          */
 868         public function setFollowPolicy( $policy ) {
 869                 $policy = trim( $policy );
 870                 if ( in_array( $policy, array( 'follow', 'nofollow' ) ) ) {
 871                         $this->mFollowPolicy = $policy;
 872                 }
 873         }
 874
 875         /**
 876          * Set the new value of the "action text", this will be added to the
 877          * "HTML title", separated from it with " - ".
 878          *
 879          * @param string $text New value of the "action text"
 880          */
 881         public function setPageTitleActionText( $text ) {
 882                 $this->mPageTitleActionText = $text;
 883         }
 884
 885         /**
 886          * Get the value of the "action text"
 887          *
 888          * @return string
 889          */
 890         public function getPageTitleActionText() {
 891                 return $this->mPageTitleActionText;
 892         }
 893
 894         /**
 895          * "HTML title" means the contents of "<title>".
 896          * It is stored as plain, unescaped text and will be run through htmlspecialchars in the skin file.
 897          *
 898          * @param string|Message $name
 899          */
 900         public function setHTMLTitle( $name ) {
 901                 if ( $name instanceof Message ) {
 902                         $this->mHTMLtitle = $name->setContext( $this->getContext() )->text();
 903                 } else {
 904                         $this->mHTMLtitle = $name;
 905                 }
 906         }
 907
 908         /**
 909          * Return the "HTML title", i.e. the content of the "<title>" tag.
 910          *
 911          * @return string
 912          */
 913         public function getHTMLTitle() {
 914                 return $this->mHTMLtitle;
 915         }
 916
 917         /**
 918          * Set $mRedirectedFrom, the Title of the page which redirected us to the current page.
 919          *
 920          * @param Title $t
 921          */
 922         public function setRedirectedFrom( $t ) {
 923                 $this->mRedirectedFrom = $t;
 924         }
 925
 926         /**
 927          * "Page title" means the contents of \<h1\>. It is stored as a valid HTML
 928          * fragment. This function allows good tags like \<sup\> in the \<h1\> tag,
 929          * but not bad tags like \<script\>. This function automatically sets
 930          * \<title\> to the same content as \<h1\> but with all tags removed. Bad
 931          * tags that were escaped in \<h1\> will still be escaped in \<title\>, and
 932          * good tags like \<i\> will be dropped entirely.
 933          *
 934          * @param string|Message $name
 935          */
 936         public function setPageTitle( $name ) {
 937                 if ( $name instanceof Message ) {
 938                         $name = $name->setContext( $this->getContext() )->text();
 939                 }
 940
 941                 # change "<script>foo&bar</script>" to "&lt;script&gt;foo&amp;bar&lt;/script&gt;"
 942                 # but leave "<i>foobar</i>" alone
 943                 $nameWithTags = Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags( $name ) );
 944                 $this->mPagetitle = $nameWithTags;
 945
 946                 # change "<i>foo&amp;bar</i>" to "foo&bar"
 947                 $this->setHTMLTitle(
 948                         $this->msg( 'pagetitle' )->rawParams( Sanitizer::stripAllTags( $nameWithTags ) )
 949                                 ->inContentLanguage()
 950                 );
 951         }
 952
 953         /**
 954          * Return the "page title", i.e. the content of the \<h1\> tag.
 955          *
 956          * @return string
 957          */
 958         public function getPageTitle() {
 959                 return $this->mPagetitle;
 960         }
 961
 962         /**
 963          * Set the Title object to use
 964          *
 965          * @param Title $t
 966          */
 967         public function setTitle( Title $t ) {
 968                 $this->getContext()->setTitle( $t );
 969         }
 970
 971         /**
 972          * Replace the subtitle with $str
 973          *
 974          * @param string|Message $str New value of the subtitle. String should be safe HTML.
 975          */
 976         public function setSubtitle( $str ) {
 977                 $this->clearSubtitle();
 978                 $this->addSubtitle( $str );
 979         }
 980
 981         /**
 982          * Add $str to the subtitle
 983          *
 984          * @deprecated since 1.19; use addSubtitle() instead
 985          * @param string|Message $str String or Message to add to the subtitle
 986          */
 987         public function appendSubtitle( $str ) {
 988                 $this->addSubtitle( $str );
 989         }
 990
 991         /**
 992          * Add $str to the subtitle
 993          *
 994          * @param string|Message $str String or Message to add to the subtitle. String should be safe HTML.
 995          */
 996         public function addSubtitle( $str ) {
 997                 if ( $str instanceof Message ) {
 998                         $this->mSubtitle[] = $str->setContext( $this->getContext() )->parse();
 999                 } else {
1000                         $this->mSubtitle[] = $str;
1001                 }
1002         }
1003
1004         /**
1005          * Add a subtitle containing a backlink to a page
1006          *
1007          * @param Title $title Title to link to
1008          * @param array $query Array of additional parameters to include in the link
1009          */
1010         public function addBacklinkSubtitle( Title $title, $query = array() ) {
1011                 if ( $title->isRedirect() ) {
1012                         $query['redirect'] = 'no';
1013                 }
1014                 $this->addSubtitle( $this->msg( 'backlinksubtitle' )
1015                         ->rawParams( Linker::link( $title, null, array(), $query ) ) );
1016         }
1017
1018         /**
1019          * Clear the subtitles
1020          */
1021         public function clearSubtitle() {
1022                 $this->mSubtitle = array();
1023         }
1024
1025         /**
1026          * Get the subtitle
1027          *
1028          * @return string
1029          */
1030         public function getSubtitle() {
1031                 return implode( "<br />\n\t\t\t\t", $this->mSubtitle );
1032         }
1033
1034         /**
1035          * Set the page as printable, i.e. it'll be displayed with with all
1036          * print styles included
1037          */
1038         public function setPrintable() {
1039                 $this->mPrintable = true;
1040         }
1041
1042         /**
1043          * Return whether the page is "printable"
1044          *
1045          * @return bool
1046          */
1047         public function isPrintable() {
1048                 return $this->mPrintable;
1049         }
1050
1051         /**
1052          * Disable output completely, i.e. calling output() will have no effect
1053          */
1054         public function disable() {
1055                 $this->mDoNothing = true;
1056         }
1057
1058         /**
1059          * Return whether the output will be completely disabled
1060          *
1061          * @return bool
1062          */
1063         public function isDisabled() {
1064                 return $this->mDoNothing;
1065         }
1066
1067         /**
1068          * Show an "add new section" link?
1069          *
1070          * @return bool
1071          */
1072         public function showNewSectionLink() {
1073                 return $this->mNewSectionLink;
1074         }
1075
1076         /**
1077          * Forcibly hide the new section link?
1078          *
1079          * @return bool
1080          */
1081         public function forceHideNewSectionLink() {
1082                 return $this->mHideNewSectionLink;
1083         }
1084
1085         /**
1086          * Add or remove feed links in the page header
1087          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
1088          * for the new version
1089          * @see addFeedLink()
1090          *
1091          * @param bool $show True: add default feeds, false: remove all feeds
1092          */
1093         public function setSyndicated( $show = true ) {
1094                 if ( $show ) {
1095                         $this->setFeedAppendQuery( false );
1096                 } else {
1097                         $this->mFeedLinks = array();
1098                 }
1099         }
1100
1101         /**
1102          * Add default feeds to the page header
1103          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
1104          * for the new version
1105          * @see addFeedLink()
1106          *
1107          * @param string $val Query to append to feed links or false to output
1108          *        default links
1109          */
1110         public function setFeedAppendQuery( $val ) {
1111                 $this->mFeedLinks = array();
1112
1113                 foreach ( $this->getConfig()->get( 'AdvertisedFeedTypes' ) as $type ) {
1114                         $query = "feed=$type";
1115                         if ( is_string( $val ) ) {
1116                                 $query .= '&' . $val;
1117                         }
1118                         $this->mFeedLinks[$type] = $this->getTitle()->getLocalURL( $query );
1119                 }
1120         }
1121
1122         /**
1123          * Add a feed link to the page header
1124          *
1125          * @param string $format Feed type, should be a key of $wgFeedClasses
1126          * @param string $href URL
1127          */
1128         public function addFeedLink( $format, $href ) {
1129                 if ( in_array( $format, $this->getConfig()->get( 'AdvertisedFeedTypes' ) ) ) {
1130                         $this->mFeedLinks[$format] = $href;
1131                 }
1132         }
1133
1134         /**
1135          * Should we output feed links for this page?
1136          * @return bool
1137          */
1138         public function isSyndicated() {
1139                 return count( $this->mFeedLinks ) > 0;
1140         }
1141
1142         /**
1143          * Return URLs for each supported syndication format for this page.
1144          * @return array Associating format keys with URLs
1145          */
1146         public function getSyndicationLinks() {
1147                 return $this->mFeedLinks;
1148         }
1149
1150         /**
1151          * Will currently always return null
1152          *
1153          * @return null
1154          */
1155         public function getFeedAppendQuery() {
1156                 return $this->mFeedLinksAppendQuery;
1157         }
1158
1159         /**
1160          * Set whether the displayed content is related to the source of the
1161          * corresponding article on the wiki
1162          * Setting true will cause the change "article related" toggle to true
1163          *
1164          * @param bool $v
1165          */
1166         public function setArticleFlag( $v ) {
1167                 $this->mIsarticle = $v;
1168                 if ( $v ) {
1169                         $this->mIsArticleRelated = $v;
1170                 }
1171         }
1172
1173         /**
1174          * Return whether the content displayed page is related to the source of
1175          * the corresponding article on the wiki
1176          *
1177          * @return bool
1178          */
1179         public function isArticle() {
1180                 return $this->mIsarticle;
1181         }
1182
1183         /**
1184          * Set whether this page is related an article on the wiki
1185          * Setting false will cause the change of "article flag" toggle to false
1186          *
1187          * @param bool $v
1188          */
1189         public function setArticleRelated( $v ) {
1190                 $this->mIsArticleRelated = $v;
1191                 if ( !$v ) {
1192                         $this->mIsarticle = false;
1193                 }
1194         }
1195
1196         /**
1197          * Return whether this page is related an article on the wiki
1198          *
1199          * @return bool
1200          */
1201         public function isArticleRelated() {
1202                 return $this->mIsArticleRelated;
1203         }
1204
1205         /**
1206          * Add new language links
1207          *
1208          * @param array $newLinkArray Associative array mapping language code to the page
1209          *                      name
1210          */
1211         public function addLanguageLinks( array $newLinkArray ) {
1212                 $this->mLanguageLinks += $newLinkArray;
1213         }
1214
1215         /**
1216          * Reset the language links and add new language links
1217          *
1218          * @param array $newLinkArray Associative array mapping language code to the page
1219          *                      name
1220          */
1221         public function setLanguageLinks( array $newLinkArray ) {
1222                 $this->mLanguageLinks = $newLinkArray;
1223         }
1224
1225         /**
1226          * Get the list of language links
1227          *
1228          * @return array Array of Interwiki Prefixed (non DB key) Titles (e.g. 'fr:Test page')
1229          */
1230         public function getLanguageLinks() {
1231                 return $this->mLanguageLinks;
1232         }
1233
1234         /**
1235          * Add an array of categories, with names in the keys
1236          *
1237          * @param array $categories Mapping category name => sort key
1238          */
1239         public function addCategoryLinks( array $categories ) {
1240                 global $wgContLang;
1241
1242                 if ( !is_array( $categories ) || count( $categories ) == 0 ) {
1243                         return;
1244                 }
1245
1246                 # Add the links to a LinkBatch
1247                 $arr = array( NS_CATEGORY => $categories );
1248                 $lb = new LinkBatch;
1249                 $lb->setArray( $arr );
1250
1251                 # Fetch existence plus the hiddencat property
1252                 $dbr = wfGetDB( DB_SLAVE );
1253                 $fields = array( 'page_id', 'page_namespace', 'page_title', 'page_len',
1254                         'page_is_redirect', 'page_latest', 'pp_value' );
1255
1256                 if ( $this->getConfig()->get( 'ContentHandlerUseDB' ) ) {
1257                         $fields[] = 'page_content_model';
1258                 }
1259
1260                 $res = $dbr->select( array( 'page', 'page_props' ),
1261                         $fields,
1262                         $lb->constructSet( 'page', $dbr ),
1263                         __METHOD__,
1264                         array(),
1265                         array( 'page_props' => array( 'LEFT JOIN', array(
1266                                 'pp_propname' => 'hiddencat',
1267                                 'pp_page = page_id'
1268                         ) ) )
1269                 );
1270
1271                 # Add the results to the link cache
1272                 $lb->addResultToCache( LinkCache::singleton(), $res );
1273
1274                 # Set all the values to 'normal'.
1275                 $categories = array_fill_keys( array_keys( $categories ), 'normal' );
1276
1277                 # Mark hidden categories
1278                 foreach ( $res as $row ) {
1279                         if ( isset( $row->pp_value ) ) {
1280                                 $categories[$row->page_title] = 'hidden';
1281                         }
1282                 }
1283
1284                 # Add the remaining categories to the skin
1285                 if ( wfRunHooks(
1286                         'OutputPageMakeCategoryLinks',
1287                         array( &$this, $categories, &$this->mCategoryLinks ) )
1288                 ) {
1289                         foreach ( $categories as $category => $type ) {
1290                                 $origcategory = $category;
1291                                 $title = Title::makeTitleSafe( NS_CATEGORY, $category );
1292                                 if ( !$title ) {
1293                                         continue;
1294                                 }
1295                                 $wgContLang->findVariantLink( $category, $title, true );
1296                                 if ( $category != $origcategory && array_key_exists( $category, $categories ) ) {
1297                                         continue;
1298                                 }
1299                                 $text = $wgContLang->convertHtml( $title->getText() );
1300                                 $this->mCategories[] = $title->getText();
1301                                 $this->mCategoryLinks[$type][] = Linker::link( $title, $text );
1302                         }
1303                 }
1304         }
1305
1306         /**
1307          * Reset the category links (but not the category list) and add $categories
1308          *
1309          * @param array $categories Mapping category name => sort key
1310          */
1311         public function setCategoryLinks( array $categories ) {
1312                 $this->mCategoryLinks = array();
1313                 $this->addCategoryLinks( $categories );
1314         }
1315
1316         /**
1317          * Get the list of category links, in a 2-D array with the following format:
1318          * $arr[$type][] = $link, where $type is either "normal" or "hidden" (for
1319          * hidden categories) and $link a HTML fragment with a link to the category
1320          * page
1321          *
1322          * @return array
1323          */
1324         public function getCategoryLinks() {
1325                 return $this->mCategoryLinks;
1326         }
1327
1328         /**
1329          * Get the list of category names this page belongs to
1330          *
1331          * @return array Array of strings
1332          */
1333         public function getCategories() {
1334                 return $this->mCategories;
1335         }
1336
1337         /**
1338          * Add an array of indicators, with their identifiers as array keys and HTML contents as values.
1339          *
1340          * In case of duplicate keys, existing values are overwritten.
1341          *
1342          * @param array $indicators
1343          * @since 1.25
1344          */
1345         public function setIndicators( array $indicators ) {
1346                 $this->mIndicators = $indicators + $this->mIndicators;
1347                 // Keep ordered by key
1348                 ksort( $this->mIndicators );
1349         }
1350
1351         /**
1352          * Get the indicators associated with this page.
1353          *
1354          * The array will be internally ordered by item keys.
1355          *
1356          * @return array Keys: identifiers, values: HTML contents
1357          * @since 1.25
1358          */
1359         public function getIndicators() {
1360                 return $this->mIndicators;
1361         }
1362
1363         /**
1364          * Do not allow scripts which can be modified by wiki users to load on this page;
1365          * only allow scripts bundled with, or generated by, the software.
1366          * Site-wide styles are controlled by a config setting, since they can be
1367          * used to create a custom skin/theme, but not user-specific ones.
1368          *
1369          * @todo this should be given a more accurate name
1370          */
1371         public function disallowUserJs() {
1372                 $this->reduceAllowedModules(
1373                         ResourceLoaderModule::TYPE_SCRIPTS,
1374                         ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL
1375                 );
1376
1377                 // Site-wide styles are controlled by a config setting, see bug 71621
1378                 // for background on why. User styles are never allowed.
1379                 if ( $this->getConfig()->get( 'AllowSiteCSSOnRestrictedPages' ) ) {
1380                         $styleOrigin = ResourceLoaderModule::ORIGIN_USER_SITEWIDE;
1381                 } else {
1382                         $styleOrigin = ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL;
1383                 }
1384                 $this->reduceAllowedModules(
1385                         ResourceLoaderModule::TYPE_STYLES,
1386                         $styleOrigin
1387                 );
1388         }
1389
1390         /**
1391          * Show what level of JavaScript / CSS untrustworthiness is allowed on this page
1392          * @see ResourceLoaderModule::$origin
1393          * @param string $type ResourceLoaderModule TYPE_ constant
1394          * @return int ResourceLoaderModule ORIGIN_ class constant
1395          */
1396         public function getAllowedModules( $type ) {
1397                 if ( $type == ResourceLoaderModule::TYPE_COMBINED ) {
1398                         return min( array_values( $this->mAllowedModules ) );
1399                 } else {
1400                         return isset( $this->mAllowedModules[$type] )
1401                                 ? $this->mAllowedModules[$type]
1402                                 : ResourceLoaderModule::ORIGIN_ALL;
1403                 }
1404         }
1405
1406         /**
1407          * Set the highest level of CSS/JS untrustworthiness allowed
1408          *
1409          * @deprecated since 1.24 Raising level of allowed untrusted content is no longer supported.
1410          *  Use reduceAllowedModules() instead
1411          * @param string $type ResourceLoaderModule TYPE_ constant
1412          * @param int $level ResourceLoaderModule class constant
1413          */
1414         public function setAllowedModules( $type, $level ) {
1415                 wfDeprecated( __METHOD__, '1.24' );
1416                 $this->reduceAllowedModules( $type, $level );
1417         }
1418
1419         /**
1420          * Limit the highest level of CSS/JS untrustworthiness allowed.
1421          *
1422          * If passed the same or a higher level than the current level of untrustworthiness set, the
1423          * level will remain unchanged.
1424          *
1425          * @param string $type
1426          * @param int $level ResourceLoaderModule class constant
1427          */
1428         public function reduceAllowedModules( $type, $level ) {
1429                 $this->mAllowedModules[$type] = min( $this->getAllowedModules( $type ), $level );
1430         }
1431
1432         /**
1433          * Prepend $text to the body HTML
1434          *
1435          * @param string $text HTML
1436          */
1437         public function prependHTML( $text ) {
1438                 $this->mBodytext = $text . $this->mBodytext;
1439         }
1440
1441         /**
1442          * Append $text to the body HTML
1443          *
1444          * @param string $text HTML
1445          */
1446         public function addHTML( $text ) {
1447                 $this->mBodytext .= $text;
1448         }
1449
1450         /**
1451          * Shortcut for adding an Html::element via addHTML.
1452          *
1453          * @since 1.19
1454          *
1455          * @param string $element
1456          * @param array $attribs
1457          * @param string $contents
1458          */
1459         public function addElement( $element, array $attribs = array(), $contents = '' ) {
1460                 $this->addHTML( Html::element( $element, $attribs, $contents ) );
1461         }
1462
1463         /**
1464          * Clear the body HTML
1465          */
1466         public function clearHTML() {
1467                 $this->mBodytext = '';
1468         }
1469
1470         /**
1471          * Get the body HTML
1472          *
1473          * @return string HTML
1474          */
1475         public function getHTML() {
1476                 return $this->mBodytext;
1477         }
1478
1479         /**
1480          * Get/set the ParserOptions object to use for wikitext parsing
1481          *
1482          * @param ParserOptions|null $options Either the ParserOption to use or null to only get the
1483          *   current ParserOption object
1484          * @return ParserOptions
1485          */
1486         public function parserOptions( $options = null ) {
1487                 if ( !$this->mParserOptions ) {
1488                         $this->mParserOptions = ParserOptions::newFromContext( $this->getContext() );
1489                         $this->mParserOptions->setEditSection( false );
1490                 }
1491                 return wfSetVar( $this->mParserOptions, $options );
1492         }
1493
1494         /**
1495          * Set the revision ID which will be seen by the wiki text parser
1496          * for things such as embedded {{REVISIONID}} variable use.
1497          *
1498          * @param int|null $revid An positive integer, or null
1499          * @return mixed Previous value
1500          */
1501         public function setRevisionId( $revid ) {
1502                 $val = is_null( $revid ) ? null : intval( $revid );
1503                 return wfSetVar( $this->mRevisionId, $val );
1504         }
1505
1506         /**
1507          * Get the displayed revision ID
1508          *
1509          * @return int
1510          */
1511         public function getRevisionId() {
1512                 return $this->mRevisionId;
1513         }
1514
1515         /**
1516          * Set the timestamp of the revision which will be displayed. This is used
1517          * to avoid a extra DB call in Skin::lastModified().
1518          *
1519          * @param string|null $timestamp
1520          * @return mixed Previous value
1521          */
1522         public function setRevisionTimestamp( $timestamp ) {
1523                 return wfSetVar( $this->mRevisionTimestamp, $timestamp );
1524         }
1525
1526         /**
1527          * Get the timestamp of displayed revision.
1528          * This will be null if not filled by setRevisionTimestamp().
1529          *
1530          * @return string|null
1531          */
1532         public function getRevisionTimestamp() {
1533                 return $this->mRevisionTimestamp;
1534         }
1535
1536         /**
1537          * Set the displayed file version
1538          *
1539          * @param File|bool $file
1540          * @return mixed Previous value
1541          */
1542         public function setFileVersion( $file ) {
1543                 $val = null;
1544                 if ( $file instanceof File && $file->exists() ) {
1545                         $val = array( 'time' => $file->getTimestamp(), 'sha1' => $file->getSha1() );
1546                 }
1547                 return wfSetVar( $this->mFileVersion, $val, true );
1548         }
1549
1550         /**
1551          * Get the displayed file version
1552          *
1553          * @return array|null ('time' => MW timestamp, 'sha1' => sha1)
1554          */
1555         public function getFileVersion() {
1556                 return $this->mFileVersion;
1557         }
1558
1559         /**
1560          * Get the templates used on this page
1561          *
1562          * @return array (namespace => dbKey => revId)
1563          * @since 1.18
1564          */
1565         public function getTemplateIds() {
1566                 return $this->mTemplateIds;
1567         }
1568
1569         /**
1570          * Get the files used on this page
1571          *
1572          * @return array (dbKey => array('time' => MW timestamp or null, 'sha1' => sha1 or ''))
1573          * @since 1.18
1574          */
1575         public function getFileSearchOptions() {
1576                 return $this->mImageTimeKeys;
1577         }
1578
1579         /**
1580          * Convert wikitext to HTML and add it to the buffer
1581          * Default assumes that the current page title will be used.
1582          *
1583          * @param string $text
1584          * @param bool $linestart Is this the start of a line?
1585          * @param bool $interface Is this text in the user interface language?
1586          */
1587         public function addWikiText( $text, $linestart = true, $interface = true ) {
1588                 $title = $this->getTitle(); // Work around E_STRICT
1589                 if ( !$title ) {
1590                         throw new MWException( 'Title is null' );
1591                 }
1592                 $this->addWikiTextTitle( $text, $title, $linestart, /*tidy*/false, $interface );
1593         }
1594
1595         /**
1596          * Add wikitext with a custom Title object
1597          *
1598          * @param string $text Wikitext
1599          * @param Title $title
1600          * @param bool $linestart Is this the start of a line?
1601          */
1602         public function addWikiTextWithTitle( $text, &$title, $linestart = true ) {
1603                 $this->addWikiTextTitle( $text, $title, $linestart );
1604         }
1605
1606         /**
1607          * Add wikitext with a custom Title object and tidy enabled.
1608          *
1609          * @param string $text Wikitext
1610          * @param Title $title
1611          * @param bool $linestart Is this the start of a line?
1612          */
1613         function addWikiTextTitleTidy( $text, &$title, $linestart = true ) {
1614                 $this->addWikiTextTitle( $text, $title, $linestart, true );
1615         }
1616
1617         /**
1618          * Add wikitext with tidy enabled
1619          *
1620          * @param string $text Wikitext
1621          * @param bool $linestart Is this the start of a line?
1622          */
1623         public function addWikiTextTidy( $text, $linestart = true ) {
1624                 $title = $this->getTitle();
1625                 $this->addWikiTextTitleTidy( $text, $title, $linestart );
1626         }
1627
1628         /**
1629          * Add wikitext with a custom Title object
1630          *
1631          * @param string $text Wikitext
1632          * @param Title $title
1633          * @param bool $linestart Is this the start of a line?
1634          * @param bool $tidy Whether to use tidy
1635          * @param bool $interface Whether it is an interface message
1636          *   (for example disables conversion)
1637          */
1638         public function addWikiTextTitle( $text, Title $title, $linestart,
1639                 $tidy = false, $interface = false
1640         ) {
1641                 global $wgParser;
1642
1643                 wfProfileIn( __METHOD__ );
1644
1645                 $popts = $this->parserOptions();
1646                 $oldTidy = $popts->setTidy( $tidy );
1647                 $popts->setInterfaceMessage( (bool)$interface );
1648
1649                 $parserOutput = $wgParser->getFreshParser()->parse(
1650                         $text, $title, $popts,
1651                         $linestart, true, $this->mRevisionId
1652                 );
1653
1654                 $popts->setTidy( $oldTidy );
1655
1656                 $this->addParserOutput( $parserOutput );
1657
1658                 wfProfileOut( __METHOD__ );
1659         }
1660
1661         /**
1662          * Add a ParserOutput object, but without Html.
1663          *
1664          * @deprecated since 1.24, use addParserOutputMetadata() instead.
1665          * @param ParserOutput $parserOutput
1666          */
1667         public function addParserOutputNoText( $parserOutput ) {
1668                 $this->addParserOutputMetadata( $parserOutput );
1669         }
1670
1671         /**
1672          * Add all metadata associated with a ParserOutput object, but without the actual HTML. This
1673          * includes categories, language links, ResourceLoader modules, effects of certain magic words,
1674          * and so on.
1675          *
1676          * @since 1.24
1677          * @param ParserOutput $parserOutput
1678          */
1679         public function addParserOutputMetadata( $parserOutput ) {
1680                 $this->mLanguageLinks += $parserOutput->getLanguageLinks();
1681                 $this->addCategoryLinks( $parserOutput->getCategories() );
1682                 $this->setIndicators( $parserOutput->getIndicators() );
1683                 $this->mNewSectionLink = $parserOutput->getNewSection();
1684                 $this->mHideNewSectionLink = $parserOutput->getHideNewSection();
1685
1686                 $this->mParseWarnings = $parserOutput->getWarnings();
1687                 if ( !$parserOutput->isCacheable() ) {
1688                         $this->enableClientCache( false );
1689                 }
1690                 $this->mNoGallery = $parserOutput->getNoGallery();
1691                 $this->mHeadItems = array_merge( $this->mHeadItems, $parserOutput->getHeadItems() );
1692                 $this->addModules( $parserOutput->getModules() );
1693                 $this->addModuleScripts( $parserOutput->getModuleScripts() );
1694                 $this->addModuleStyles( $parserOutput->getModuleStyles() );
1695                 $this->addModuleMessages( $parserOutput->getModuleMessages() );
1696                 $this->addJsConfigVars( $parserOutput->getJsConfigVars() );
1697                 $this->mPreventClickjacking = $this->mPreventClickjacking
1698                         || $parserOutput->preventClickjacking();
1699
1700                 // Template versioning...
1701                 foreach ( (array)$parserOutput->getTemplateIds() as $ns => $dbks ) {
1702                         if ( isset( $this->mTemplateIds[$ns] ) ) {
1703                                 $this->mTemplateIds[$ns] = $dbks + $this->mTemplateIds[$ns];
1704                         } else {
1705                                 $this->mTemplateIds[$ns] = $dbks;
1706                         }
1707                 }
1708                 // File versioning...
1709                 foreach ( (array)$parserOutput->getFileSearchOptions() as $dbk => $data ) {
1710                         $this->mImageTimeKeys[$dbk] = $data;
1711                 }
1712
1713                 // Hooks registered in the object
1714                 $parserOutputHooks = $this->getConfig()->get( 'ParserOutputHooks' );
1715                 foreach ( $parserOutput->getOutputHooks() as $hookInfo ) {
1716                         list( $hookName, $data ) = $hookInfo;
1717                         if ( isset( $parserOutputHooks[$hookName] ) ) {
1718                                 call_user_func( $parserOutputHooks[$hookName], $this, $parserOutput, $data );
1719                         }
1720                 }
1721
1722                 // Link flags are ignored for now, but may in the future be
1723                 // used to mark individual language links.
1724                 $linkFlags = array();
1725                 wfRunHooks( 'LanguageLinks', array( $this->getTitle(), &$this->mLanguageLinks, &$linkFlags ) );
1726                 wfRunHooks( 'OutputPageParserOutput', array( &$this, $parserOutput ) );
1727         }
1728
1729         /**
1730          * Add the HTML and enhancements for it (like ResourceLoader modules) associated with a
1731          * ParserOutput object, without any other metadata.
1732          *
1733          * @since 1.24
1734          * @param ParserOutput $parserOutput
1735          */
1736         public function addParserOutputContent( $parserOutput ) {
1737                 $this->addParserOutputText( $parserOutput );
1738
1739                 $this->addModules( $parserOutput->getModules() );
1740                 $this->addModuleScripts( $parserOutput->getModuleScripts() );
1741                 $this->addModuleStyles( $parserOutput->getModuleStyles() );
1742                 $this->addModuleMessages( $parserOutput->getModuleMessages() );
1743
1744                 $this->addJsConfigVars( $parserOutput->getJsConfigVars() );
1745         }
1746
1747         /**
1748          * Add the HTML associated with a ParserOutput object, without any metadata.
1749          *
1750          * @since 1.24
1751          * @param ParserOutput $parserOutput
1752          */
1753         public function addParserOutputText( $parserOutput ) {
1754                 $text = $parserOutput->getText();
1755                 wfRunHooks( 'OutputPageBeforeHTML', array( &$this, &$text ) );
1756                 $this->addHTML( $text );
1757         }
1758
1759         /**
1760          * Add everything from a ParserOutput object.
1761          *
1762          * @param ParserOutput $parserOutput
1763          */
1764         function addParserOutput( $parserOutput ) {
1765                 $this->addParserOutputMetadata( $parserOutput );
1766                 $parserOutput->setTOCEnabled( $this->mEnableTOC );
1767
1768                 // Touch section edit links only if not previously disabled
1769                 if ( $parserOutput->getEditSectionTokens() ) {
1770                         $parserOutput->setEditSectionTokens( $this->mEnableSectionEditLinks );
1771                 }
1772
1773                 $this->addParserOutputText( $parserOutput );
1774         }
1775
1776         /**
1777          * Add the output of a QuickTemplate to the output buffer
1778          *
1779          * @param QuickTemplate $template
1780          */
1781         public function addTemplate( &$template ) {
1782                 $this->addHTML( $template->getHTML() );
1783         }
1784
1785         /**
1786          * Parse wikitext and return the HTML.
1787          *
1788          * @param string $text
1789          * @param bool $linestart Is this the start of a line?
1790          * @param bool $interface Use interface language ($wgLang instead of
1791          *   $wgContLang) while parsing language sensitive magic words like GRAMMAR and PLURAL.
1792          *   This also disables LanguageConverter.
1793          * @param Language $language Target language object, will override $interface
1794          * @throws MWException
1795          * @return string HTML
1796          */
1797         public function parse( $text, $linestart = true, $interface = false, $language = null ) {
1798                 global $wgParser;
1799
1800                 if ( is_null( $this->getTitle() ) ) {
1801                         throw new MWException( 'Empty $mTitle in ' . __METHOD__ );
1802                 }
1803
1804                 $popts = $this->parserOptions();
1805                 if ( $interface ) {
1806                         $popts->setInterfaceMessage( true );
1807                 }
1808                 if ( $language !== null ) {
1809                         $oldLang = $popts->setTargetLanguage( $language );
1810                 }
1811
1812                 $parserOutput = $wgParser->getFreshParser()->parse(
1813                         $text, $this->getTitle(), $popts,
1814                         $linestart, true, $this->mRevisionId
1815                 );
1816
1817                 if ( $interface ) {
1818                         $popts->setInterfaceMessage( false );
1819                 }
1820                 if ( $language !== null ) {
1821                         $popts->setTargetLanguage( $oldLang );
1822                 }
1823
1824                 return $parserOutput->getText();
1825         }
1826
1827         /**
1828          * Parse wikitext, strip paragraphs, and return the HTML.
1829          *
1830          * @param string $text
1831          * @param bool $linestart Is this the start of a line?
1832          * @param bool $interface Use interface language ($wgLang instead of
1833          *   $wgContLang) while parsing language sensitive magic
1834          *   words like GRAMMAR and PLURAL
1835          * @return string HTML
1836          */
1837         public function parseInline( $text, $linestart = true, $interface = false ) {
1838                 $parsed = $this->parse( $text, $linestart, $interface );
1839                 return Parser::stripOuterParagraph( $parsed );
1840         }
1841
1842         /**
1843          * Set the value of the "s-maxage" part of the "Cache-control" HTTP header
1844          *
1845          * @param int $maxage Maximum cache time on the Squid, in seconds.
1846          */
1847         public function setSquidMaxage( $maxage ) {
1848                 $this->mSquidMaxage = $maxage;
1849         }
1850
1851         /**
1852          * Use enableClientCache(false) to force it to send nocache headers
1853          *
1854          * @param bool $state
1855          *
1856          * @return bool
1857          */
1858         public function enableClientCache( $state ) {
1859                 return wfSetVar( $this->mEnableClientCache, $state );
1860         }
1861
1862         /**
1863          * Get the list of cookies that will influence on the cache
1864          *
1865          * @return array
1866          */
1867         function getCacheVaryCookies() {
1868                 static $cookies;
1869                 if ( $cookies === null ) {
1870                         $config = $this->getConfig();
1871                         $cookies = array_merge(
1872                                 array(
1873                                         $config->get( 'CookiePrefix' ) . 'Token',
1874                                         $config->get( 'CookiePrefix' ) . 'LoggedOut',
1875                                         "forceHTTPS",
1876                                         session_name()
1877                                 ),
1878                                 $config->get( 'CacheVaryCookies' )
1879                         );
1880                         wfRunHooks( 'GetCacheVaryCookies', array( $this, &$cookies ) );
1881                 }
1882                 return $cookies;
1883         }
1884
1885         /**
1886          * Check if the request has a cache-varying cookie header
1887          * If it does, it's very important that we don't allow public caching
1888          *
1889          * @return bool
1890          */
1891         function haveCacheVaryCookies() {
1892                 $cookieHeader = $this->getRequest()->getHeader( 'cookie' );
1893                 if ( $cookieHeader === false ) {
1894                         return false;
1895                 }
1896                 $cvCookies = $this->getCacheVaryCookies();
1897                 foreach ( $cvCookies as $cookieName ) {
1898                         # Check for a simple string match, like the way squid does it
1899                         if ( strpos( $cookieHeader, $cookieName ) !== false ) {
1900                                 wfDebug( __METHOD__ . ": found $cookieName\n" );
1901                                 return true;
1902                         }
1903                 }
1904                 wfDebug( __METHOD__ . ": no cache-varying cookies found\n" );
1905                 return false;
1906         }
1907
1908         /**
1909          * Add an HTTP header that will influence on the cache
1910          *
1911          * @param string $header Header name
1912          * @param array|null $option
1913          * @todo FIXME: Document the $option parameter; it appears to be for
1914          *        X-Vary-Options but what format is acceptable?
1915          */
1916         public function addVaryHeader( $header, $option = null ) {
1917                 if ( !array_key_exists( $header, $this->mVaryHeader ) ) {
1918                         $this->mVaryHeader[$header] = (array)$option;
1919                 } elseif ( is_array( $option ) ) {
1920                         if ( is_array( $this->mVaryHeader[$header] ) ) {
1921                                 $this->mVaryHeader[$header] = array_merge( $this->mVaryHeader[$header], $option );
1922                         } else {
1923                                 $this->mVaryHeader[$header] = $option;
1924                         }
1925                 }
1926                 $this->mVaryHeader[$header] = array_unique( (array)$this->mVaryHeader[$header] );
1927         }
1928
1929         /**
1930          * Return a Vary: header on which to vary caches. Based on the keys of $mVaryHeader,
1931          * such as Accept-Encoding or Cookie
1932          *
1933          * @return string
1934          */
1935         public function getVaryHeader() {
1936                 return 'Vary: ' . join( ', ', array_keys( $this->mVaryHeader ) );
1937         }
1938
1939         /**
1940          * Get a complete X-Vary-Options header
1941          *
1942          * @return string
1943          */
1944         public function getXVO() {
1945                 $cvCookies = $this->getCacheVaryCookies();
1946
1947                 $cookiesOption = array();
1948                 foreach ( $cvCookies as $cookieName ) {
1949                         $cookiesOption[] = 'string-contains=' . $cookieName;
1950                 }
1951                 $this->addVaryHeader( 'Cookie', $cookiesOption );
1952
1953                 $headers = array();
1954                 foreach ( $this->mVaryHeader as $header => $option ) {
1955                         $newheader = $header;
1956                         if ( is_array( $option ) && count( $option ) > 0 ) {
1957                                 $newheader .= ';' . implode( ';', $option );
1958                         }
1959                         $headers[] = $newheader;
1960                 }
1961                 $xvo = 'X-Vary-Options: ' . implode( ',', $headers );
1962
1963                 return $xvo;
1964         }
1965
1966         /**
1967          * bug 21672: Add Accept-Language to Vary and XVO headers
1968          * if there's no 'variant' parameter existed in GET.
1969          *
1970          * For example:
1971          *   /w/index.php?title=Main_page should always be served; but
1972          *   /w/index.php?title=Main_page&variant=zh-cn should never be served.
1973          */
1974         function addAcceptLanguage() {
1975                 $title = $this->getTitle();
1976                 if ( !$title instanceof Title ) {
1977                         return;
1978                 }
1979
1980                 $lang = $title->getPageLanguage();
1981                 if ( !$this->getRequest()->getCheck( 'variant' ) && $lang->hasVariants() ) {
1982                         $variants = $lang->getVariants();
1983                         $aloption = array();
1984                         foreach ( $variants as $variant ) {
1985                                 if ( $variant === $lang->getCode() ) {
1986                                         continue;
1987                                 } else {
1988                                         $aloption[] = 'string-contains=' . $variant;
1989
1990                                         // IE and some other browsers use BCP 47 standards in
1991                                         // their Accept-Language header, like "zh-CN" or "zh-Hant".
1992                                         // We should handle these too.
1993                                         $variantBCP47 = wfBCP47( $variant );
1994                                         if ( $variantBCP47 !== $variant ) {
1995                                                 $aloption[] = 'string-contains=' . $variantBCP47;
1996                                         }
1997                                 }
1998                         }
1999                         $this->addVaryHeader( 'Accept-Language', $aloption );
2000                 }
2001         }
2002
2003         /**
2004          * Set a flag which will cause an X-Frame-Options header appropriate for
2005          * edit pages to be sent. The header value is controlled by
2006          * $wgEditPageFrameOptions.
2007          *
2008          * This is the default for special pages. If you display a CSRF-protected
2009          * form on an ordinary view page, then you need to call this function.
2010          *
2011          * @param bool $enable
2012          */
2013         public function preventClickjacking( $enable = true ) {
2014                 $this->mPreventClickjacking = $enable;
2015         }
2016
2017         /**
2018          * Turn off frame-breaking. Alias for $this->preventClickjacking(false).
2019          * This can be called from pages which do not contain any CSRF-protected
2020          * HTML form.
2021          */
2022         public function allowClickjacking() {
2023                 $this->mPreventClickjacking = false;
2024         }
2025
2026         /**
2027          * Get the prevent-clickjacking flag
2028          *
2029          * @since 1.24
2030          * @return bool
2031          */
2032         public function getPreventClickjacking() {
2033                 return $this->mPreventClickjacking;
2034         }
2035
2036         /**
2037          * Get the X-Frame-Options header value (without the name part), or false
2038          * if there isn't one. This is used by Skin to determine whether to enable
2039          * JavaScript frame-breaking, for clients that don't support X-Frame-Options.
2040          *
2041          * @return string
2042          */
2043         public function getFrameOptions() {
2044                 $config = $this->getConfig();
2045                 if ( $config->get( 'BreakFrames' ) ) {
2046                         return 'DENY';
2047                 } elseif ( $this->mPreventClickjacking && $config->get( 'EditPageFrameOptions' ) ) {
2048                         return $config->get( 'EditPageFrameOptions' );
2049                 }
2050                 return false;
2051         }
2052
2053         /**
2054          * Send cache control HTTP headers
2055          */
2056         public function sendCacheControl() {
2057                 $response = $this->getRequest()->response();
2058                 $config = $this->getConfig();
2059                 if ( $config->get( 'UseETag' ) && $this->mETag ) {
2060                         $response->header( "ETag: $this->mETag" );
2061                 }
2062
2063                 $this->addVaryHeader( 'Cookie' );
2064                 $this->addAcceptLanguage();
2065
2066                 # don't serve compressed data to clients who can't handle it
2067                 # maintain different caches for logged-in users and non-logged in ones
2068                 $response->header( $this->getVaryHeader() );
2069
2070                 if ( $config->get( 'UseXVO' ) ) {
2071                         # Add an X-Vary-Options header for Squid with Wikimedia patches
2072                         $response->header( $this->getXVO() );
2073                 }
2074
2075                 if ( $this->mEnableClientCache ) {
2076                         if (
2077                                 $config->get( 'UseSquid' ) && session_id() == '' && !$this->isPrintable() &&
2078                                 $this->mSquidMaxage != 0 && !$this->haveCacheVaryCookies()
2079                         ) {
2080                                 if ( $config->get( 'UseESI' ) ) {
2081                                         # We'll purge the proxy cache explicitly, but require end user agents
2082                                         # to revalidate against the proxy on each visit.
2083                                         # Surrogate-Control controls our Squid, Cache-Control downstream caches
2084                                         wfDebug( __METHOD__ . ": proxy caching with ESI; {$this->mLastModified} **\n", 'log' );
2085                                         # start with a shorter timeout for initial testing
2086                                         # header( 'Surrogate-Control: max-age=2678400+2678400, content="ESI/1.0"');
2087                                         $response->header( 'Surrogate-Control: max-age=' . $config->get( 'SquidMaxage' )
2088                                                 . '+' . $this->mSquidMaxage . ', content="ESI/1.0"' );
2089                                         $response->header( 'Cache-Control: s-maxage=0, must-revalidate, max-age=0' );
2090                                 } else {
2091                                         # We'll purge the proxy cache for anons explicitly, but require end user agents
2092                                         # to revalidate against the proxy on each visit.
2093                                         # IMPORTANT! The Squid needs to replace the Cache-Control header with
2094                                         # Cache-Control: s-maxage=0, must-revalidate, max-age=0
2095                                         wfDebug( __METHOD__ . ": local proxy caching; {$this->mLastModified} **\n", 'log' );
2096                                         # start with a shorter timeout for initial testing
2097                                         # header( "Cache-Control: s-maxage=2678400, must-revalidate, max-age=0" );
2098                                         $response->header( 'Cache-Control: s-maxage=' . $this->mSquidMaxage
2099                                                 . ', must-revalidate, max-age=0' );
2100                                 }
2101                         } else {
2102                                 # We do want clients to cache if they can, but they *must* check for updates
2103                                 # on revisiting the page.
2104                                 wfDebug( __METHOD__ . ": private caching; {$this->mLastModified} **\n", 'log' );
2105                                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
2106                                 $response->header( "Cache-Control: private, must-revalidate, max-age=0" );
2107                         }
2108                         if ( $this->mLastModified ) {
2109                                 $response->header( "Last-Modified: {$this->mLastModified}" );
2110                         }
2111                 } else {
2112                         wfDebug( __METHOD__ . ": no caching **\n", 'log' );
2113
2114                         # In general, the absence of a last modified header should be enough to prevent
2115                         # the client from using its cache. We send a few other things just to make sure.
2116                         $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
2117                         $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
2118                         $response->header( 'Pragma: no-cache' );
2119                 }
2120         }
2121
2122         /**
2123          * Finally, all the text has been munged and accumulated into
2124          * the object, let's actually output it:
2125          */
2126         public function output() {
2127                 if ( $this->mDoNothing ) {
2128                         return;
2129                 }
2130
2131                 wfProfileIn( __METHOD__ );
2132
2133                 $response = $this->getRequest()->response();
2134                 $config = $this->getConfig();
2135
2136                 if ( $this->mRedirect != '' ) {
2137                         # Standards require redirect URLs to be absolute
2138                         $this->mRedirect = wfExpandUrl( $this->mRedirect, PROTO_CURRENT );
2139
2140                         $redirect = $this->mRedirect;
2141                         $code = $this->mRedirectCode;
2142
2143                         if ( wfRunHooks( "BeforePageRedirect", array( $this, &$redirect, &$code ) ) ) {
2144                                 if ( $code == '301' || $code == '303' ) {
2145                                         if ( !$config->get( 'DebugRedirects' ) ) {
2146                                                 $message = HttpStatus::getMessage( $code );
2147                                                 $response->header( "HTTP/1.1 $code $message" );
2148                                         }
2149                                         $this->mLastModified = wfTimestamp( TS_RFC2822 );
2150                                 }
2151                                 if ( $config->get( 'VaryOnXFP' ) ) {
2152                                         $this->addVaryHeader( 'X-Forwarded-Proto' );
2153                                 }
2154                                 $this->sendCacheControl();
2155
2156                                 $response->header( "Content-Type: text/html; charset=utf-8" );
2157                                 if ( $config->get( 'DebugRedirects' ) ) {
2158                                         $url = htmlspecialchars( $redirect );
2159                                         print "<html>\n<head>\n<title>Redirect</title>\n</head>\n<body>\n";
2160                                         print "<p>Location: <a href=\"$url\">$url</a></p>\n";
2161                                         print "</body>\n</html>\n";
2162                                 } else {
2163                                         $response->header( 'Location: ' . $redirect );
2164                                 }
2165                         }
2166
2167                         wfProfileOut( __METHOD__ );
2168                         return;
2169                 } elseif ( $this->mStatusCode ) {
2170                         $message = HttpStatus::getMessage( $this->mStatusCode );
2171                         if ( $message ) {
2172                                 $response->header( 'HTTP/1.1 ' . $this->mStatusCode . ' ' . $message );
2173                         }
2174                 }
2175
2176                 # Buffer output; final headers may depend on later processing
2177                 ob_start();
2178
2179                 $response->header( 'Content-type: ' . $config->get( 'MimeType' ) . '; charset=UTF-8' );
2180                 $response->header( 'Content-language: ' . $config->get( 'LanguageCode' ) );
2181
2182                 // Avoid Internet Explorer "compatibility view" in IE 8-10, so that
2183                 // jQuery etc. can work correctly.
2184                 $response->header( 'X-UA-Compatible: IE=Edge' );
2185
2186                 // Prevent framing, if requested
2187                 $frameOptions = $this->getFrameOptions();
2188                 if ( $frameOptions ) {
2189                         $response->header( "X-Frame-Options: $frameOptions" );
2190                 }
2191
2192                 if ( $this->mArticleBodyOnly ) {
2193                         echo $this->mBodytext;
2194                 } else {
2195
2196                         $sk = $this->getSkin();
2197                         // add skin specific modules
2198                         $modules = $sk->getDefaultModules();
2199
2200                         // enforce various default modules for all skins
2201                         $coreModules = array(
2202                                 // keep this list as small as possible
2203                                 'mediawiki.page.startup',
2204                                 'mediawiki.user',
2205                         );
2206
2207                         // Support for high-density display images if enabled
2208                         if ( $config->get( 'ResponsiveImages' ) ) {
2209                                 $coreModules[] = 'mediawiki.hidpi';
2210                         }
2211
2212                         $this->addModules( $coreModules );
2213                         foreach ( $modules as $group ) {
2214                                 $this->addModules( $group );
2215                         }
2216                         MWDebug::addModules( $this );
2217
2218                         // Hook that allows last minute changes to the output page, e.g.
2219                         // adding of CSS or Javascript by extensions.
2220                         wfRunHooks( 'BeforePageDisplay', array( &$this, &$sk ) );
2221
2222                         wfProfileIn( 'Output-skin' );
2223                         $sk->outputPage();
2224                         wfProfileOut( 'Output-skin' );
2225                 }
2226
2227                 // This hook allows last minute changes to final overall output by modifying output buffer
2228                 wfRunHooks( 'AfterFinalPageOutput', array( $this ) );
2229
2230                 $this->sendCacheControl();
2231
2232                 ob_end_flush();
2233
2234                 wfProfileOut( __METHOD__ );
2235         }
2236
2237         /**
2238          * Actually output something with print.
2239          *
2240          * @param string $ins The string to output
2241          * @deprecated since 1.22 Use echo yourself.
2242          */
2243         public function out( $ins ) {
2244                 wfDeprecated( __METHOD__, '1.22' );
2245                 print $ins;
2246         }
2247
2248         /**
2249          * Produce a "user is blocked" page.
2250          * @deprecated since 1.18
2251          */
2252         function blockedPage() {
2253                 throw new UserBlockedError( $this->getUser()->mBlock );
2254         }
2255
2256         /**
2257          * Prepare this object to display an error page; disable caching and
2258          * indexing, clear the current text and redirect, set the page's title
2259          * and optionally an custom HTML title (content of the "<title>" tag).
2260          *
2261          * @param string|Message $pageTitle Will be passed directly to setPageTitle()
2262          * @param string|Message $htmlTitle Will be passed directly to setHTMLTitle();
2263          *                   optional, if not passed the "<title>" attribute will be
2264          *                   based on $pageTitle
2265          */
2266         public function prepareErrorPage( $pageTitle, $htmlTitle = false ) {
2267                 $this->setPageTitle( $pageTitle );
2268                 if ( $htmlTitle !== false ) {
2269                         $this->setHTMLTitle( $htmlTitle );
2270                 }
2271                 $this->setRobotPolicy( 'noindex,nofollow' );
2272                 $this->setArticleRelated( false );
2273                 $this->enableClientCache( false );
2274                 $this->mRedirect = '';
2275                 $this->clearSubtitle();
2276                 $this->clearHTML();
2277         }
2278
2279         /**
2280          * Output a standard error page
2281          *
2282          * showErrorPage( 'titlemsg', 'pagetextmsg' );
2283          * showErrorPage( 'titlemsg', 'pagetextmsg', array( 'param1', 'param2' ) );
2284          * showErrorPage( 'titlemsg', $messageObject );
2285          * showErrorPage( $titleMessageObject, $messageObject );
2286          *
2287          * @param string|Message $title Message key (string) for page title, or a Message object
2288          * @param string|Message $msg Message key (string) for page text, or a Message object
2289          * @param array $params Message parameters; ignored if $msg is a Message object
2290          */
2291         public function showErrorPage( $title, $msg, $params = array() ) {
2292                 if ( !$title instanceof Message ) {
2293                         $title = $this->msg( $title );
2294                 }
2295
2296                 $this->prepareErrorPage( $title );
2297
2298                 if ( $msg instanceof Message ) {
2299                         if ( $params !== array() ) {
2300                                 trigger_error( 'Argument ignored: $params. The message parameters argument '
2301                                         . 'is discarded when the $msg argument is a Message object instead of '
2302                                         . 'a string.', E_USER_NOTICE );
2303                         }
2304                         $this->addHTML( $msg->parseAsBlock() );
2305                 } else {
2306                         $this->addWikiMsgArray( $msg, $params );
2307                 }
2308
2309                 $this->returnToMain();
2310         }
2311
2312         /**
2313          * Output a standard permission error page
2314          *
2315          * @param array $errors Error message keys
2316          * @param string $action Action that was denied or null if unknown
2317          */
2318         public function showPermissionsErrorPage( array $errors, $action = null ) {
2319                 // For some action (read, edit, create and upload), display a "login to do this action"
2320                 // error if all of the following conditions are met:
2321                 // 1. the user is not logged in
2322                 // 2. the only error is insufficient permissions (i.e. no block or something else)
2323                 // 3. the error can be avoided simply by logging in
2324                 if ( in_array( $action, array( 'read', 'edit', 'createpage', 'createtalk', 'upload' ) )
2325                         && $this->getUser()->isAnon() && count( $errors ) == 1 && isset( $errors[0][0] )
2326                         && ( $errors[0][0] == 'badaccess-groups' || $errors[0][0] == 'badaccess-group0' )
2327                         && ( User::groupHasPermission( 'user', $action )
2328                         || User::groupHasPermission( 'autoconfirmed', $action ) )
2329                 ) {
2330                         $displayReturnto = null;
2331
2332                         # Due to bug 32276, if a user does not have read permissions,
2333                         # $this->getTitle() will just give Special:Badtitle, which is
2334                         # not especially useful as a returnto parameter. Use the title
2335                         # from the request instead, if there was one.
2336                         $request = $this->getRequest();
2337                         $returnto = Title::newFromURL( $request->getVal( 'title', '' ) );
2338                         if ( $action == 'edit' ) {
2339                                 $msg = 'whitelistedittext';
2340                                 $displayReturnto = $returnto;
2341                         } elseif ( $action == 'createpage' || $action == 'createtalk' ) {
2342                                 $msg = 'nocreatetext';
2343                         } elseif ( $action == 'upload' ) {
2344                                 $msg = 'uploadnologintext';
2345                         } else { # Read
2346                                 $msg = 'loginreqpagetext';
2347                                 $displayReturnto = Title::newMainPage();
2348                         }
2349
2350                         $query = array();
2351
2352                         if ( $returnto ) {
2353                                 $query['returnto'] = $returnto->getPrefixedText();
2354
2355                                 if ( !$request->wasPosted() ) {
2356                                         $returntoquery = $request->getValues();
2357                                         unset( $returntoquery['title'] );
2358                                         unset( $returntoquery['returnto'] );
2359                                         unset( $returntoquery['returntoquery'] );
2360                                         $query['returntoquery'] = wfArrayToCgi( $returntoquery );
2361                                 }
2362                         }
2363                         $loginLink = Linker::linkKnown(
2364                                 SpecialPage::getTitleFor( 'Userlogin' ),
2365                                 $this->msg( 'loginreqlink' )->escaped(),
2366                                 array(),
2367                                 $query
2368                         );
2369
2370                         $this->prepareErrorPage( $this->msg( 'loginreqtitle' ) );
2371                         $this->addHTML( $this->msg( $msg )->rawParams( $loginLink )->parse() );
2372
2373                         # Don't return to a page the user can't read otherwise
2374                         # we'll end up in a pointless loop
2375                         if ( $displayReturnto && $displayReturnto->userCan( 'read', $this->getUser() ) ) {
2376                                 $this->returnToMain( null, $displayReturnto );
2377                         }
2378                 } else {
2379                         $this->prepareErrorPage( $this->msg( 'permissionserrors' ) );
2380                         $this->addWikiText( $this->formatPermissionsErrorMessage( $errors, $action ) );
2381                 }
2382         }
2383
2384         /**
2385          * Display an error page indicating that a given version of MediaWiki is
2386          * required to use it
2387          *
2388          * @param mixed $version The version of MediaWiki needed to use the page
2389          */
2390         public function versionRequired( $version ) {
2391                 $this->prepareErrorPage( $this->msg( 'versionrequired', $version ) );
2392
2393                 $this->addWikiMsg( 'versionrequiredtext', $version );
2394                 $this->returnToMain();
2395         }
2396
2397         /**
2398          * Display an error page noting that a given permission bit is required.
2399          * @deprecated since 1.18, just throw the exception directly
2400          * @param string $permission Key required
2401          * @throws PermissionsError
2402          */
2403         public function permissionRequired( $permission ) {
2404                 throw new PermissionsError( $permission );
2405         }
2406
2407         /**
2408          * Produce the stock "please login to use the wiki" page
2409          *
2410          * @deprecated since 1.19; throw the exception directly
2411          */
2412         public function loginToUse() {
2413                 throw new PermissionsError( 'read' );
2414         }
2415
2416         /**
2417          * Format a list of error messages
2418          *
2419          * @param array $errors Array of arrays returned by Title::getUserPermissionsErrors
2420          * @param string $action Action that was denied or null if unknown
2421          * @return string The wikitext error-messages, formatted into a list.
2422          */
2423         public function formatPermissionsErrorMessage( array $errors, $action = null ) {
2424                 if ( $action == null ) {
2425                         $text = $this->msg( 'permissionserrorstext', count( $errors ) )->plain() . "\n\n";
2426                 } else {
2427                         $action_desc = $this->msg( "action-$action" )->plain();
2428                         $text = $this->msg(
2429                                 'permissionserrorstext-withaction',
2430                                 count( $errors ),
2431                                 $action_desc
2432                         )->plain() . "\n\n";
2433                 }
2434
2435                 if ( count( $errors ) > 1 ) {
2436                         $text .= '<ul class="permissions-errors">' . "\n";
2437
2438                         foreach ( $errors as $error ) {
2439                                 $text .= '<li>';
2440                                 $text .= call_user_func_array( array( $this, 'msg' ), $error )->plain();
2441                                 $text .= "</li>\n";
2442                         }
2443                         $text .= '</ul>';
2444                 } else {
2445                         $text .= "<div class=\"permissions-errors\">\n" .
2446                                         call_user_func_array( array( $this, 'msg' ), reset( $errors ) )->plain() .
2447                                         "\n</div>";
2448                 }
2449
2450                 return $text;
2451         }
2452
2453         /**
2454          * Display a page stating that the Wiki is in read-only mode.
2455          * Should only be called after wfReadOnly() has returned true.
2456          *
2457          * Historically, this function was used to show the source of the page that the user
2458          * was trying to edit and _also_ permissions error messages. The relevant code was
2459          * moved into EditPage in 1.19 (r102024 / d83c2a431c2a) and removed here in 1.25.
2460          *
2461          * @deprecated since 1.25; throw the exception directly
2462          * @throws ReadOnlyError
2463          */
2464         public function readOnlyPage() {
2465                 if ( func_num_args() > 0 ) {
2466                         throw new MWException( __METHOD__ . ' no longer accepts arguments since 1.25.' );
2467                 }
2468
2469                 throw new ReadOnlyError;
2470         }
2471
2472         /**
2473          * Turn off regular page output and return an error response
2474          * for when rate limiting has triggered.
2475          *
2476          * @deprecated since 1.25; throw the exception directly
2477          */
2478         public function rateLimited() {
2479                 wfDeprecated( __METHOD__, '1.25' );
2480                 throw new ThrottledError;
2481         }
2482
2483         /**
2484          * Show a warning about slave lag
2485          *
2486          * If the lag is higher than $wgSlaveLagCritical seconds,
2487          * then the warning is a bit more obvious. If the lag is
2488          * lower than $wgSlaveLagWarning, then no warning is shown.
2489          *
2490          * @param int $lag Slave lag
2491          */
2492         public function showLagWarning( $lag ) {
2493                 $config = $this->getConfig();
2494                 if ( $lag >= $config->get( 'SlaveLagWarning' ) ) {
2495                         $message = $lag < $config->get( 'SlaveLagCritical' )
2496                                 ? 'lag-warn-normal'
2497                                 : 'lag-warn-high';
2498                         $wrap = Html::rawElement( 'div', array( 'class' => "mw-{$message}" ), "\n$1\n" );
2499                         $this->wrapWikiMsg( "$wrap\n", array( $message, $this->getLanguage()->formatNum( $lag ) ) );
2500                 }
2501         }
2502
2503         public function showFatalError( $message ) {
2504                 $this->prepareErrorPage( $this->msg( 'internalerror' ) );
2505
2506                 $this->addHTML( $message );
2507         }
2508
2509         public function showUnexpectedValueError( $name, $val ) {
2510                 $this->showFatalError( $this->msg( 'unexpected', $name, $val )->text() );
2511         }
2512
2513         public function showFileCopyError( $old, $new ) {
2514                 $this->showFatalError( $this->msg( 'filecopyerror', $old, $new )->text() );
2515         }
2516
2517         public function showFileRenameError( $old, $new ) {
2518                 $this->showFatalError( $this->msg( 'filerenameerror', $old, $new )->text() );
2519         }
2520
2521         public function showFileDeleteError( $name ) {
2522                 $this->showFatalError( $this->msg( 'filedeleteerror', $name )->text() );
2523         }
2524
2525         public function showFileNotFoundError( $name ) {
2526                 $this->showFatalError( $this->msg( 'filenotfound', $name )->text() );
2527         }
2528
2529         /**
2530          * Add a "return to" link pointing to a specified title
2531          *
2532          * @param Title $title Title to link
2533          * @param array $query Query string parameters
2534          * @param string $text Text of the link (input is not escaped)
2535          * @param array $options Options array to pass to Linker
2536          */
2537         public function addReturnTo( $title, array $query = array(), $text = null, $options = array() ) {
2538                 $link = $this->msg( 'returnto' )->rawParams(
2539                         Linker::link( $title, $text, array(), $query, $options ) )->escaped();
2540                 $this->addHTML( "<p id=\"mw-returnto\">{$link}</p>\n" );
2541         }
2542
2543         /**
2544          * Add a "return to" link pointing to a specified title,
2545          * or the title indicated in the request, or else the main page
2546          *
2547          * @param mixed $unused
2548          * @param Title|string $returnto Title or String to return to
2549          * @param string $returntoquery Query string for the return to link
2550          */
2551         public function returnToMain( $unused = null, $returnto = null, $returntoquery = null ) {
2552                 if ( $returnto == null ) {
2553                         $returnto = $this->getRequest()->getText( 'returnto' );
2554                 }
2555
2556                 if ( $returntoquery == null ) {
2557                         $returntoquery = $this->getRequest()->getText( 'returntoquery' );
2558                 }
2559
2560                 if ( $returnto === '' ) {
2561                         $returnto = Title::newMainPage();
2562                 }
2563
2564                 if ( is_object( $returnto ) ) {
2565                         $titleObj = $returnto;
2566                 } else {
2567                         $titleObj = Title::newFromText( $returnto );
2568                 }
2569                 if ( !is_object( $titleObj ) ) {
2570                         $titleObj = Title::newMainPage();
2571                 }
2572
2573                 $this->addReturnTo( $titleObj, wfCgiToArray( $returntoquery ) );
2574         }
2575
2576         /**
2577          * @param Skin $sk The given Skin
2578          * @param bool $includeStyle Unused
2579          * @return string The doctype, opening "<html>", and head element.
2580          */
2581         public function headElement( Skin $sk, $includeStyle = true ) {
2582                 global $wgContLang;
2583
2584                 $section = new ProfileSection( __METHOD__ );
2585
2586                 $userdir = $this->getLanguage()->getDir();
2587                 $sitedir = $wgContLang->getDir();
2588
2589                 $ret = Html::htmlHeader( $sk->getHtmlElementAttributes() );
2590
2591                 if ( $this->getHTMLTitle() == '' ) {
2592                         $this->setHTMLTitle( $this->msg( 'pagetitle', $this->getPageTitle() )->inContentLanguage() );
2593                 }
2594
2595                 $openHead = Html::openElement( 'head' );
2596                 if ( $openHead ) {
2597                         # Don't bother with the newline if $head == ''
2598                         $ret .= "$openHead\n";
2599                 }
2600
2601                 if ( !Html::isXmlMimeType( $this->getConfig()->get( 'MimeType' ) ) ) {
2602                         // Add <meta charset="UTF-8">
2603                         // This should be before <title> since it defines the charset used by
2604                         // text including the text inside <title>.
2605                         // The spec recommends defining XHTML5's charset using the XML declaration
2606                         // instead of meta.
2607                         // Our XML declaration is output by Html::htmlHeader.
2608                         // http://www.whatwg.org/html/semantics.html#attr-meta-http-equiv-content-type
2609                         // http://www.whatwg.org/html/semantics.html#charset
2610                         $ret .= Html::element( 'meta', array( 'charset' => 'UTF-8' ) ) . "\n";
2611                 }
2612
2613                 $ret .= Html::element( 'title', null, $this->getHTMLTitle() ) . "\n";
2614
2615                 foreach ( $this->getHeadLinksArray() as $item ) {
2616                         $ret .= $item . "\n";
2617                 }
2618
2619                 // No newline after buildCssLinks since makeResourceLoaderLink did that already
2620                 $ret .= $this->buildCssLinks();
2621
2622                 $ret .= $this->getHeadScripts() . "\n";
2623
2624                 foreach ( $this->mHeadItems as $item ) {
2625                         $ret .= $item . "\n";
2626                 }
2627
2628                 $closeHead = Html::closeElement( 'head' );
2629                 if ( $closeHead ) {
2630                         $ret .= "$closeHead\n";
2631                 }
2632
2633                 $bodyClasses = array();
2634                 $bodyClasses[] = 'mediawiki';
2635
2636                 # Classes for LTR/RTL directionality support
2637                 $bodyClasses[] = $userdir;
2638                 $bodyClasses[] = "sitedir-$sitedir";
2639
2640                 if ( $this->getLanguage()->capitalizeAllNouns() ) {
2641                         # A <body> class is probably not the best way to do this . . .
2642                         $bodyClasses[] = 'capitalize-all-nouns';
2643                 }
2644
2645                 $bodyClasses[] = $sk->getPageClasses( $this->getTitle() );
2646                 $bodyClasses[] = 'skin-' . Sanitizer::escapeClass( $sk->getSkinName() );
2647                 $bodyClasses[] =
2648                         'action-' . Sanitizer::escapeClass( Action::getActionName( $this->getContext() ) );
2649
2650                 $bodyAttrs = array();
2651                 // While the implode() is not strictly needed, it's used for backwards compatibility
2652                 // (this used to be built as a string and hooks likely still expect that).
2653                 $bodyAttrs['class'] = implode( ' ', $bodyClasses );
2654
2655                 // Allow skins and extensions to add body attributes they need
2656                 $sk->addToBodyAttributes( $this, $bodyAttrs );
2657                 wfRunHooks( 'OutputPageBodyAttributes', array( $this, $sk, &$bodyAttrs ) );
2658
2659                 $ret .= Html::openElement( 'body', $bodyAttrs ) . "\n";
2660
2661                 return $ret;
2662         }
2663
2664         /**
2665          * Get a ResourceLoader object associated with this OutputPage
2666          *
2667          * @return ResourceLoader
2668          */
2669         public function getResourceLoader() {
2670                 if ( is_null( $this->mResourceLoader ) ) {
2671                         $this->mResourceLoader = new ResourceLoader( $this->getConfig() );
2672                 }
2673                 return $this->mResourceLoader;
2674         }
2675
2676         /**
2677          * @todo Document
2678          * @param array|string $modules One or more module names
2679          * @param string $only ResourceLoaderModule TYPE_ class constant
2680          * @param bool $useESI
2681          * @param array $extraQuery Array with extra query parameters to add to each
2682          *   request. array( param => value ).
2683          * @param bool $loadCall If true, output an (asynchronous) mw.loader.load()
2684          *   call rather than a "<script src='...'>" tag.
2685          * @return string The html "<script>", "<link>" and "<style>" tags
2686          */
2687         protected function makeResourceLoaderLink( $modules, $only, $useESI = false,
2688                 array $extraQuery = array(), $loadCall = false
2689         ) {
2690                 $modules = (array)$modules;
2691
2692                 $links = array(
2693                         'html' => '',
2694                         'states' => array(),
2695                 );
2696
2697                 if ( !count( $modules ) ) {
2698                         return $links;
2699                 }
2700
2701                 if ( count( $modules ) > 1 ) {
2702                         // Remove duplicate module requests
2703                         $modules = array_unique( $modules );
2704                         // Sort module names so requests are more uniform
2705                         sort( $modules );
2706
2707                         if ( ResourceLoader::inDebugMode() ) {
2708                                 // Recursively call us for every item
2709                                 foreach ( $modules as $name ) {
2710                                         $link = $this->makeResourceLoaderLink( $name, $only, $useESI );
2711                                         $links['html'] .= $link['html'];
2712                                         $links['states'] += $link['states'];
2713                                 }
2714                                 return $links;
2715                         }
2716                 }
2717
2718                 if ( !is_null( $this->mTarget ) ) {
2719                         $extraQuery['target'] = $this->mTarget;
2720                 }
2721
2722                 // Create keyed-by-source and then keyed-by-group list of module objects from modules list
2723                 $sortedModules = array();
2724                 $resourceLoader = $this->getResourceLoader();
2725                 $resourceLoaderUseESI = $this->getConfig()->get( 'ResourceLoaderUseESI' );
2726                 foreach ( $modules as $name ) {
2727                         $module = $resourceLoader->getModule( $name );
2728                         # Check that we're allowed to include this module on this page
2729                         if ( !$module
2730                                 || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_SCRIPTS )
2731                                         && $only == ResourceLoaderModule::TYPE_SCRIPTS )
2732                                 || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_STYLES )
2733                                         && $only == ResourceLoaderModule::TYPE_STYLES )
2734                                 || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_COMBINED )
2735                                         && $only == ResourceLoaderModule::TYPE_COMBINED )
2736                                 || ( $this->mTarget && !in_array( $this->mTarget, $module->getTargets() ) )
2737                         ) {
2738                                 continue;
2739                         }
2740
2741                         $sortedModules[$module->getSource()][$module->getGroup()][$name] = $module;
2742                 }
2743
2744                 foreach ( $sortedModules as $source => $groups ) {
2745                         foreach ( $groups as $group => $grpModules ) {
2746                                 // Special handling for user-specific groups
2747                                 $user = null;
2748                                 if ( ( $group === 'user' || $group === 'private' ) && $this->getUser()->isLoggedIn() ) {
2749                                         $user = $this->getUser()->getName();
2750                                 }
2751
2752                                 // Create a fake request based on the one we are about to make so modules return
2753                                 // correct timestamp and emptiness data
2754                                 $query = ResourceLoader::makeLoaderQuery(
2755                                         array(), // modules; not determined yet
2756                                         $this->getLanguage()->getCode(),
2757                                         $this->getSkin()->getSkinName(),
2758                                         $user,
2759                                         null, // version; not determined yet
2760                                         ResourceLoader::inDebugMode(),
2761                                         $only === ResourceLoaderModule::TYPE_COMBINED ? null : $only,
2762                                         $this->isPrintable(),
2763                                         $this->getRequest()->getBool( 'handheld' ),
2764                                         $extraQuery
2765                                 );
2766                                 $context = new ResourceLoaderContext( $resourceLoader, new FauxRequest( $query ) );
2767
2768                                 // Extract modules that know they're empty and see if we have one or more
2769                                 // raw modules
2770                                 $isRaw = false;
2771                                 foreach ( $grpModules as $key => $module ) {
2772                                         // Inline empty modules: since they're empty, just mark them as 'ready' (bug 46857)
2773                                         // If we're only getting the styles, we don't need to do anything for empty modules.
2774                                         if ( $module->isKnownEmpty( $context ) ) {
2775                                                 unset( $grpModules[$key] );
2776                                                 if ( $only !== ResourceLoaderModule::TYPE_STYLES ) {
2777                                                         $links['states'][$key] = 'ready';
2778                                                 }
2779                                         }
2780
2781                                         $isRaw |= $module->isRaw();
2782                                 }
2783
2784                                 // If there are no non-empty modules, skip this group
2785                                 if ( count( $grpModules ) === 0 ) {
2786                                         continue;
2787                                 }
2788
2789                                 // Inline private modules. These can't be loaded through load.php for security
2790                                 // reasons, see bug 34907. Note that these modules should be loaded from
2791                                 // getHeadScripts() before the first loader call. Otherwise other modules can't
2792                                 // properly use them as dependencies (bug 30914)
2793                                 if ( $group === 'private' ) {
2794                                         if ( $only == ResourceLoaderModule::TYPE_STYLES ) {
2795                                                 $links['html'] .= Html::inlineStyle(
2796                                                         $resourceLoader->makeModuleResponse( $context, $grpModules )
2797                                                 );
2798                                         } else {
2799                                                 $links['html'] .= Html::inlineScript(
2800                                                         ResourceLoader::makeLoaderConditionalScript(
2801                                                                 $resourceLoader->makeModuleResponse( $context, $grpModules )
2802                                                         )
2803                                                 );
2804                                         }
2805                                         $links['html'] .= "\n";
2806                                         continue;
2807                                 }
2808
2809                                 // Special handling for the user group; because users might change their stuff
2810                                 // on-wiki like user pages, or user preferences; we need to find the highest
2811                                 // timestamp of these user-changeable modules so we can ensure cache misses on change
2812                                 // This should NOT be done for the site group (bug 27564) because anons get that too
2813                                 // and we shouldn't be putting timestamps in Squid-cached HTML
2814                                 $version = null;
2815                                 if ( $group === 'user' ) {
2816                                         // Get the maximum timestamp
2817                                         $timestamp = 1;
2818                                         foreach ( $grpModules as $module ) {
2819                                                 $timestamp = max( $timestamp, $module->getModifiedTime( $context ) );
2820                                         }
2821                                         // Add a version parameter so cache will break when things change
2822                                         $query['version'] = wfTimestamp( TS_ISO_8601_BASIC, $timestamp );
2823                                 }
2824
2825                                 $query['modules'] = ResourceLoader::makePackedModulesString( array_keys( $grpModules ) );
2826                                 $moduleContext = new ResourceLoaderContext( $resourceLoader, new FauxRequest( $query ) );
2827                                 $url = $resourceLoader->createLoaderURL( $source, $moduleContext, $extraQuery );
2828
2829                                 if ( $useESI && $resourceLoaderUseESI ) {
2830                                         $esi = Xml::element( 'esi:include', array( 'src' => $url ) );
2831                                         if ( $only == ResourceLoaderModule::TYPE_STYLES ) {
2832                                                 $link = Html::inlineStyle( $esi );
2833                                         } else {
2834                                                 $link = Html::inlineScript( $esi );
2835                                         }
2836                                 } else {
2837                                         // Automatically select style/script elements
2838                                         if ( $only === ResourceLoaderModule::TYPE_STYLES ) {
2839                                                 $link = Html::linkedStyle( $url );
2840                                         } elseif ( $loadCall ) {
2841                                                 $link = Html::inlineScript(
2842                                                         ResourceLoader::makeLoaderConditionalScript(
2843                                                                 Xml::encodeJsCall( 'mw.loader.load', array( $url, 'text/javascript', true ) )
2844                                                         )
2845                                                 );
2846                                         } else {
2847                                                 $link = Html::linkedScript( $url );
2848                                                 if ( $context->getOnly() === 'scripts' && !$context->getRaw() && !$isRaw ) {
2849                                                         // Wrap only=script requests in a conditional as browsers not supported
2850                                                         // by the startup module would unconditionally execute this module.
2851                                                         // Otherwise users will get "ReferenceError: mw is undefined" or
2852                                                         // "jQuery is undefined" from e.g. a "site" module.
2853                                                         $link = Html::inlineScript(
2854                                                                 ResourceLoader::makeLoaderConditionalScript(
2855                                                                         Xml::encodeJsCall( 'document.write', array( $link ) )
2856                                                                 )
2857                                                         );
2858                                                 }
2859
2860                                                 // For modules requested directly in the html via <link> or <script>,
2861                                                 // tell mw.loader they are being loading to prevent duplicate requests.
2862                                                 foreach ( $grpModules as $key => $module ) {
2863                                                         // Don't output state=loading for the startup module..
2864                                                         if ( $key !== 'startup' ) {
2865                                                                 $links['states'][$key] = 'loading';
2866                                                         }
2867                                                 }
2868                                         }
2869                                 }
2870
2871                                 if ( $group == 'noscript' ) {
2872                                         $links['html'] .= Html::rawElement( 'noscript', array(), $link ) . "\n";
2873                                 } else {
2874                                         $links['html'] .= $link . "\n";
2875                                 }
2876                         }
2877                 }
2878
2879                 return $links;
2880         }
2881
2882         /**
2883          * Build html output from an array of links from makeResourceLoaderLink.
2884          * @param array $links
2885          * @return string HTML
2886          */
2887         protected static function getHtmlFromLoaderLinks( array $links ) {
2888                 $html = '';
2889                 $states = array();
2890                 foreach ( $links as $link ) {
2891                         if ( !is_array( $link ) ) {
2892                                 $html .= $link;
2893                         } else {
2894                                 $html .= $link['html'];
2895                                 $states += $link['states'];
2896                         }
2897                 }
2898
2899                 if ( count( $states ) ) {
2900                         $html = Html::inlineScript(
2901                                 ResourceLoader::makeLoaderConditionalScript(
2902                                         ResourceLoader::makeLoaderStateScript( $states )
2903                                 )
2904                         ) . "\n" . $html;
2905                 }
2906
2907                 return $html;
2908         }
2909
2910         /**
2911          * JS stuff to put in the "<head>". This is the startup module, config
2912          * vars and modules marked with position 'top'
2913          *
2914          * @return string HTML fragment
2915          */
2916         function getHeadScripts() {
2917                 // Startup - this will immediately load jquery and mediawiki modules
2918                 $links = array();
2919                 $links[] = $this->makeResourceLoaderLink( 'startup', ResourceLoaderModule::TYPE_SCRIPTS, true );
2920
2921                 // Load config before anything else
2922                 $links[] = Html::inlineScript(
2923                         ResourceLoader::makeLoaderConditionalScript(
2924                                 ResourceLoader::makeConfigSetScript( $this->getJSVars() )
2925                         )
2926                 );
2927
2928                 // Load embeddable private modules before any loader links
2929                 // This needs to be TYPE_COMBINED so these modules are properly wrapped
2930                 // in mw.loader.implement() calls and deferred until mw.user is available
2931                 $embedScripts = array( 'user.options', 'user.tokens' );
2932                 $links[] = $this->makeResourceLoaderLink( $embedScripts, ResourceLoaderModule::TYPE_COMBINED );
2933
2934                 // Scripts and messages "only" requests marked for top inclusion
2935                 // Messages should go first
2936                 $links[] = $this->makeResourceLoaderLink(
2937                         $this->getModuleMessages( true, 'top' ),
2938                         ResourceLoaderModule::TYPE_MESSAGES
2939                 );
2940                 $links[] = $this->makeResourceLoaderLink(
2941                         $this->getModuleScripts( true, 'top' ),
2942                         ResourceLoaderModule::TYPE_SCRIPTS
2943                 );
2944
2945                 // Modules requests - let the client calculate dependencies and batch requests as it likes
2946                 // Only load modules that have marked themselves for loading at the top
2947                 $modules = $this->getModules( true, 'top' );
2948                 if ( $modules ) {
2949                         $links[] = Html::inlineScript(
2950                                 ResourceLoader::makeLoaderConditionalScript(
2951                                         Xml::encodeJsCall( 'mw.loader.load', array( $modules ) )
2952                                 )
2953                         );
2954                 }
2955
2956                 if ( $this->getConfig()->get( 'ResourceLoaderExperimentalAsyncLoading' ) ) {
2957                         $links[] = $this->getScriptsForBottomQueue( true );
2958                 }
2959
2960                 return self::getHtmlFromLoaderLinks( $links );
2961         }
2962
2963         /**
2964          * JS stuff to put at the 'bottom', which can either be the bottom of the
2965          * "<body>" or the bottom of the "<head>" depending on
2966          * $wgResourceLoaderExperimentalAsyncLoading: modules marked with position
2967          * 'bottom', legacy scripts ($this->mScripts), user preferences, site JS
2968          * and user JS.
2969          *
2970          * @param bool $inHead If true, this HTML goes into the "<head>",
2971          *   if false it goes into the "<body>".
2972          * @return string
2973          */
2974         function getScriptsForBottomQueue( $inHead ) {
2975                 // Scripts and messages "only" requests marked for bottom inclusion
2976                 // If we're in the <head>, use load() calls rather than <script src="..."> tags
2977                 // Messages should go first
2978                 $links = array();
2979                 $links[] = $this->makeResourceLoaderLink( $this->getModuleMessages( true, 'bottom' ),
2980                         ResourceLoaderModule::TYPE_MESSAGES, /* $useESI = */ false, /* $extraQuery = */ array(),
2981                         /* $loadCall = */ $inHead
2982                 );
2983                 $links[] = $this->makeResourceLoaderLink( $this->getModuleScripts( true, 'bottom' ),
2984                         ResourceLoaderModule::TYPE_SCRIPTS, /* $useESI = */ false, /* $extraQuery = */ array(),
2985                         /* $loadCall = */ $inHead
2986                 );
2987
2988                 // Modules requests - let the client calculate dependencies and batch requests as it likes
2989                 // Only load modules that have marked themselves for loading at the bottom
2990                 $modules = $this->getModules( true, 'bottom' );
2991                 if ( $modules ) {
2992                         $links[] = Html::inlineScript(
2993                                 ResourceLoader::makeLoaderConditionalScript(
2994                                         Xml::encodeJsCall( 'mw.loader.load', array( $modules, null, true ) )
2995                                 )
2996                         );
2997                 }
2998
2999                 // Legacy Scripts
3000                 $links[] = "\n" . $this->mScripts;
3001
3002                 // Add site JS if enabled
3003                 $links[] = $this->makeResourceLoaderLink( 'site', ResourceLoaderModule::TYPE_SCRIPTS,
3004                         /* $useESI = */ false, /* $extraQuery = */ array(), /* $loadCall = */ $inHead
3005                 );
3006
3007                 // Add user JS if enabled
3008                 if ( $this->getConfig()->get( 'AllowUserJs' )
3009                         && $this->getUser()->isLoggedIn()
3010                         && $this->getTitle()
3011                         && $this->getTitle()->isJsSubpage()
3012                         && $this->userCanPreview()
3013                 ) {
3014                         # XXX: additional security check/prompt?
3015                         // We're on a preview of a JS subpage
3016                         // Exclude this page from the user module in case it's in there (bug 26283)
3017                         $links[] = $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_SCRIPTS, false,
3018                                 array( 'excludepage' => $this->getTitle()->getPrefixedDBkey() ), $inHead
3019                         );
3020                         // Load the previewed JS
3021                         $links[] = Html::inlineScript( "\n"
3022                                         . $this->getRequest()->getText( 'wpTextbox1' ) . "\n" ) . "\n";
3023
3024                         // FIXME: If the user is previewing, say, ./vector.js, his ./common.js will be loaded
3025                         // asynchronously and may arrive *after* the inline script here. So the previewed code
3026                         // may execute before ./common.js runs. Normally, ./common.js runs before ./vector.js...
3027                 } else {
3028                         // Include the user module normally, i.e., raw to avoid it being wrapped in a closure.
3029                         $links[] = $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_SCRIPTS,
3030                                 /* $useESI = */ false, /* $extraQuery = */ array(), /* $loadCall = */ $inHead
3031                         );
3032                 }
3033
3034                 // Group JS is only enabled if site JS is enabled.
3035                 $links[] = $this->makeResourceLoaderLink( 'user.groups', ResourceLoaderModule::TYPE_COMBINED,
3036                         /* $useESI = */ false, /* $extraQuery = */ array(), /* $loadCall = */ $inHead
3037                 );
3038
3039                 return self::getHtmlFromLoaderLinks( $links );
3040         }
3041
3042         /**
3043          * JS stuff to put at the bottom of the "<body>"
3044          * @return string
3045          */
3046         function getBottomScripts() {
3047                 // Optimise jQuery ready event cross-browser.
3048                 // This also enforces $.isReady to be true at </body> which fixes the
3049                 // mw.loader bug in Firefox with using document.write between </body>
3050                 // and the DOMContentReady event (bug 47457).
3051                 $html = Html::inlineScript( 'window.jQuery && jQuery.ready();' );
3052
3053                 if ( !$this->getConfig()->get( 'ResourceLoaderExperimentalAsyncLoading' ) ) {
3054                         $html .= $this->getScriptsForBottomQueue( false );
3055                 }
3056
3057                 return $html;
3058         }
3059
3060         /**
3061          * Get the javascript config vars to include on this page
3062          *
3063          * @return array Array of javascript config vars
3064          * @since 1.23
3065          */
3066         public function getJsConfigVars() {
3067                 return $this->mJsConfigVars;
3068         }
3069
3070         /**
3071          * Add one or more variables to be set in mw.config in JavaScript
3072          *
3073          * @param string|array $keys Key or array of key/value pairs
3074          * @param mixed $value [optional] Value of the configuration variable
3075          */
3076         public function addJsConfigVars( $keys, $value = null ) {
3077                 if ( is_array( $keys ) ) {
3078                         foreach ( $keys as $key => $value ) {
3079                                 $this->mJsConfigVars[$key] = $value;
3080                         }
3081                         return;
3082                 }
3083
3084                 $this->mJsConfigVars[$keys] = $value;
3085         }
3086
3087         /**
3088          * Get an array containing the variables to be set in mw.config in JavaScript.
3089          *
3090          * Do not add things here which can be evaluated in ResourceLoaderStartUpModule
3091          * - in other words, page-independent/site-wide variables (without state).
3092          * You will only be adding bloat to the html page and causing page caches to
3093          * have to be purged on configuration changes.
3094          * @return array
3095          */
3096         private function getJSVars() {
3097                 global $wgContLang;
3098
3099                 $curRevisionId = 0;
3100                 $articleId = 0;
3101                 $canonicalSpecialPageName = false; # bug 21115
3102
3103                 $title = $this->getTitle();
3104                 $ns = $title->getNamespace();
3105                 $canonicalNamespace = MWNamespace::exists( $ns )
3106                         ? MWNamespace::getCanonicalName( $ns )
3107                         : $title->getNsText();
3108
3109                 $sk = $this->getSkin();
3110                 // Get the relevant title so that AJAX features can use the correct page name
3111                 // when making API requests from certain special pages (bug 34972).
3112                 $relevantTitle = $sk->getRelevantTitle();
3113                 $relevantUser = $sk->getRelevantUser();
3114
3115                 if ( $ns == NS_SPECIAL ) {
3116                         list( $canonicalSpecialPageName, /*...*/ ) =
3117                                 SpecialPageFactory::resolveAlias( $title->getDBkey() );
3118                 } elseif ( $this->canUseWikiPage() ) {
3119                         $wikiPage = $this->getWikiPage();
3120                         $curRevisionId = $wikiPage->getLatest();
3121                         $articleId = $wikiPage->getId();
3122                 }
3123
3124                 $lang = $title->getPageLanguage();
3125
3126                 // Pre-process information
3127                 $separatorTransTable = $lang->separatorTransformTable();
3128                 $separatorTransTable = $separatorTransTable ? $separatorTransTable : array();
3129                 $compactSeparatorTransTable = array(
3130                         implode( "\t", array_keys( $separatorTransTable ) ),
3131                         implode( "\t", $separatorTransTable ),
3132                 );
3133                 $digitTransTable = $lang->digitTransformTable();
3134                 $digitTransTable = $digitTransTable ? $digitTransTable : array();
3135                 $compactDigitTransTable = array(
3136                         implode( "\t", array_keys( $digitTransTable ) ),
3137                         implode( "\t", $digitTransTable ),
3138                 );
3139
3140                 $user = $this->getUser();
3141
3142                 $vars = array(
3143                         'wgCanonicalNamespace' => $canonicalNamespace,
3144                         'wgCanonicalSpecialPageName' => $canonicalSpecialPageName,
3145                         'wgNamespaceNumber' => $title->getNamespace(),
3146                         'wgPageName' => $title->getPrefixedDBkey(),
3147                         'wgTitle' => $title->getText(),
3148                         'wgCurRevisionId' => $curRevisionId,
3149                         'wgRevisionId' => (int)$this->getRevisionId(),
3150                         'wgArticleId' => $articleId,
3151                         'wgIsArticle' => $this->isArticle(),
3152                         'wgIsRedirect' => $title->isRedirect(),
3153                         'wgAction' => Action::getActionName( $this->getContext() ),
3154                         'wgUserName' => $user->isAnon() ? null : $user->getName(),
3155                         'wgUserGroups' => $user->getEffectiveGroups(),
3156                         'wgCategories' => $this->getCategories(),
3157                         'wgBreakFrames' => $this->getFrameOptions() == 'DENY',
3158                         'wgPageContentLanguage' => $lang->getCode(),
3159                         'wgPageContentModel' => $title->getContentModel(),
3160                         'wgSeparatorTransformTable' => $compactSeparatorTransTable,
3161                         'wgDigitTransformTable' => $compactDigitTransTable,
3162                         'wgDefaultDateFormat' => $lang->getDefaultDateFormat(),
3163                         'wgMonthNames' => $lang->getMonthNamesArray(),
3164                         'wgMonthNamesShort' => $lang->getMonthAbbreviationsArray(),
3165                         'wgRelevantPageName' => $relevantTitle->getPrefixedDBkey(),
3166                 );
3167
3168                 if ( $user->isLoggedIn() ) {
3169                         $vars['wgUserId'] = $user->getId();
3170                         $vars['wgUserEditCount'] = $user->getEditCount();
3171                         $userReg = wfTimestampOrNull( TS_UNIX, $user->getRegistration() );
3172                         $vars['wgUserRegistration'] = $userReg !== null ? ( $userReg * 1000 ) : null;
3173                         // Get the revision ID of the oldest new message on the user's talk
3174                         // page. This can be used for constructing new message alerts on
3175                         // the client side.
3176                         $vars['wgUserNewMsgRevisionId'] = $user->getNewMessageRevisionId();
3177                 }
3178
3179                 if ( $wgContLang->hasVariants() ) {
3180                         $vars['wgUserVariant'] = $wgContLang->getPreferredVariant();
3181                 }
3182                 // Same test as SkinTemplate
3183                 $vars['wgIsProbablyEditable'] = $title->quickUserCan( 'edit', $user )
3184                         && ( $title->exists() || $title->quickUserCan( 'create', $user ) );
3185
3186                 foreach ( $title->getRestrictionTypes() as $type ) {
3187                         $vars['wgRestriction' . ucfirst( $type )] = $title->getRestrictions( $type );
3188                 }
3189
3190                 if ( $title->isMainPage() ) {
3191                         $vars['wgIsMainPage'] = true;
3192                 }
3193
3194                 if ( $this->mRedirectedFrom ) {
3195                         $vars['wgRedirectedFrom'] = $this->mRedirectedFrom->getPrefixedDBkey();
3196                 }
3197
3198                 if ( $relevantUser ) {
3199                         $vars['wgRelevantUserName'] = $relevantUser->getName();
3200                 }
3201
3202                 // Allow extensions to add their custom variables to the mw.config map.
3203                 // Use the 'ResourceLoaderGetConfigVars' hook if the variable is not
3204                 // page-dependant but site-wide (without state).
3205                 // Alternatively, you may want to use OutputPage->addJsConfigVars() instead.
3206                 wfRunHooks( 'MakeGlobalVariablesScript', array( &$vars, $this ) );
3207
3208                 // Merge in variables from addJsConfigVars last
3209                 return array_merge( $vars, $this->getJsConfigVars() );
3210         }
3211
3212         /**
3213          * To make it harder for someone to slip a user a fake
3214          * user-JavaScript or user-CSS preview, a random token
3215          * is associated with the login session. If it's not
3216          * passed back with the preview request, we won't render
3217          * the code.
3218          *
3219          * @return bool
3220          */
3221         public function userCanPreview() {
3222                 if ( $this->getRequest()->getVal( 'action' ) != 'submit'
3223                         || !$this->getRequest()->wasPosted()
3224                         || !$this->getUser()->matchEditToken(
3225                                 $this->getRequest()->getVal( 'wpEditToken' ) )
3226                 ) {
3227                         return false;
3228                 }
3229                 if ( !$this->getTitle()->isJsSubpage() && !$this->getTitle()->isCssSubpage() ) {
3230                         return false;
3231                 }
3232
3233                 return !count( $this->getTitle()->getUserPermissionsErrors( 'edit', $this->getUser() ) );
3234         }
3235
3236         /**
3237          * @return array Array in format "link name or number => 'link html'".
3238          */
3239         public function getHeadLinksArray() {
3240                 global $wgVersion;
3241
3242                 $tags = array();
3243                 $config = $this->getConfig();
3244
3245                 $canonicalUrl = $this->mCanonicalUrl;
3246
3247                 $tags['meta-generator'] = Html::element( 'meta', array(
3248                         'name' => 'generator',
3249                         'content' => "MediaWiki $wgVersion",
3250                 ) );
3251
3252                 $p = "{$this->mIndexPolicy},{$this->mFollowPolicy}";
3253                 if ( $p !== 'index,follow' ) {
3254                         // http://www.robotstxt.org/wc/meta-user.html
3255                         // Only show if it's different from the default robots policy
3256                         $tags['meta-robots'] = Html::element( 'meta', array(
3257                                 'name' => 'robots',
3258                                 'content' => $p,
3259                         ) );
3260                 }
3261
3262                 foreach ( $this->mMetatags as $tag ) {
3263                         if ( 0 == strcasecmp( 'http:', substr( $tag[0], 0, 5 ) ) ) {
3264                                 $a = 'http-equiv';
3265                                 $tag[0] = substr( $tag[0], 5 );
3266                         } else {
3267                                 $a = 'name';
3268                         }
3269                         $tagName = "meta-{$tag[0]}";
3270                         if ( isset( $tags[$tagName] ) ) {
3271                                 $tagName .= $tag[1];
3272                         }
3273                         $tags[$tagName] = Html::element( 'meta',
3274                                 array(
3275                                         $a => $tag[0],
3276                                         'content' => $tag[1]
3277                                 )
3278                         );
3279                 }
3280
3281                 foreach ( $this->mLinktags as $tag ) {
3282                         $tags[] = Html::element( 'link', $tag );
3283                 }
3284
3285                 # Universal edit button
3286                 if ( $config->get( 'UniversalEditButton' ) && $this->isArticleRelated() ) {
3287                         $user = $this->getUser();
3288                         if ( $this->getTitle()->quickUserCan( 'edit', $user )
3289                                 && ( $this->getTitle()->exists() || $this->getTitle()->quickUserCan( 'create', $user ) ) ) {
3290                                 // Original UniversalEditButton
3291                                 $msg = $this->msg( 'edit' )->text();
3292                                 $tags['universal-edit-button'] = Html::element( 'link', array(
3293                                         'rel' => 'alternate',
3294                                         'type' => 'application/x-wiki',
3295                                         'title' => $msg,
3296                                         'href' => $this->getTitle()->getEditURL(),
3297                                 ) );
3298                                 // Alternate edit link
3299                                 $tags['alternative-edit'] = Html::element( 'link', array(
3300                                         'rel' => 'edit',
3301                                         'title' => $msg,
3302                                         'href' => $this->getTitle()->getEditURL(),
3303                                 ) );
3304                         }
3305                 }
3306
3307                 # Generally the order of the favicon and apple-touch-icon links
3308                 # should not matter, but Konqueror (3.5.9 at least) incorrectly
3309                 # uses whichever one appears later in the HTML source. Make sure
3310                 # apple-touch-icon is specified first to avoid this.
3311                 if ( $config->get( 'AppleTouchIcon' ) !== false ) {
3312                         $tags['apple-touch-icon'] = Html::element( 'link', array(
3313                                 'rel' => 'apple-touch-icon',
3314                                 'href' => $config->get( 'AppleTouchIcon' )
3315                         ) );
3316                 }
3317
3318                 if ( $config->get( 'Favicon' ) !== false ) {
3319                         $tags['favicon'] = Html::element( 'link', array(
3320                                 'rel' => 'shortcut icon',
3321                                 'href' => $config->get( 'Favicon' )
3322                         ) );
3323                 }
3324
3325                 # OpenSearch description link
3326                 $tags['opensearch'] = Html::element( 'link', array(
3327                         'rel' => 'search',
3328                         'type' => 'application/opensearchdescription+xml',
3329                         'href' => wfScript( 'opensearch_desc' ),
3330                         'title' => $this->msg( 'opensearch-desc' )->inContentLanguage()->text(),
3331                 ) );
3332
3333                 if ( $config->get( 'EnableAPI' ) ) {
3334                         # Real Simple Discovery link, provides auto-discovery information
3335                         # for the MediaWiki API (and potentially additional custom API
3336                         # support such as WordPress or Twitter-compatible APIs for a
3337                         # blogging extension, etc)
3338                         $tags['rsd'] = Html::element( 'link', array(
3339                                 'rel' => 'EditURI',
3340                                 'type' => 'application/rsd+xml',
3341                                 // Output a protocol-relative URL here if $wgServer is protocol-relative
3342                                 // Whether RSD accepts relative or protocol-relative URLs is completely undocumented, though
3343                                 'href' => wfExpandUrl( wfAppendQuery(
3344                                         wfScript( 'api' ),
3345                                         array( 'action' => 'rsd' ) ),
3346                                         PROTO_RELATIVE
3347                                 ),
3348                         ) );
3349                 }
3350
3351                 # Language variants
3352                 if ( !$config->get( 'DisableLangConversion' ) ) {
3353                         $lang = $this->getTitle()->getPageLanguage();
3354                         if ( $lang->hasVariants() ) {
3355                                 $variants = $lang->getVariants();
3356                                 foreach ( $variants as $_v ) {
3357                                         $tags["variant-$_v"] = Html::element( 'link', array(
3358                                                 'rel' => 'alternate',
3359                                                 'hreflang' => wfBCP47( $_v ),
3360                                                 'href' => $this->getTitle()->getLocalURL( array( 'variant' => $_v ) ) )
3361                                         );
3362                                 }
3363                         }
3364                         # x-default link per https://support.google.com/webmasters/answer/189077?hl=en
3365                         $tags["variant-x-default"] = Html::element( 'link', array(
3366                                 'rel' => 'alternate',
3367                                 'hreflang' => 'x-default',
3368                                 'href' => $this->getTitle()->getLocalURL() ) );
3369                 }
3370
3371                 # Copyright
3372                 $copyright = '';
3373                 if ( $config->get( 'RightsPage' ) ) {
3374                         $copy = Title::newFromText( $config->get( 'RightsPage' ) );
3375
3376                         if ( $copy ) {
3377                                 $copyright = $copy->getLocalURL();
3378                         }
3379                 }
3380
3381                 if ( !$copyright && $config->get( 'RightsUrl' ) ) {
3382                         $copyright = $config->get( 'RightsUrl' );
3383                 }
3384
3385                 if ( $copyright ) {
3386                         $tags['copyright'] = Html::element( 'link', array(
3387                                 'rel' => 'copyright',
3388                                 'href' => $copyright )
3389                         );
3390                 }
3391
3392                 # Feeds
3393                 if ( $config->get( 'Feed' ) ) {
3394                         foreach ( $this->getSyndicationLinks() as $format => $link ) {
3395                                 # Use the page name for the title.  In principle, this could
3396                                 # lead to issues with having the same name for different feeds
3397                                 # corresponding to the same page, but we can't avoid that at
3398                                 # this low a level.
3399
3400                                 $tags[] = $this->feedLink(
3401                                         $format,
3402                                         $link,
3403                                         # Used messages: 'page-rss-feed' and 'page-atom-feed' (for an easier grep)
3404                                         $this->msg( "page-{$format}-feed", $this->getTitle()->getPrefixedText() )->text()
3405                                 );
3406                         }
3407
3408                         # Recent changes feed should appear on every page (except recentchanges,
3409                         # that would be redundant). Put it after the per-page feed to avoid
3410                         # changing existing behavior. It's still available, probably via a
3411                         # menu in your browser. Some sites might have a different feed they'd
3412                         # like to promote instead of the RC feed (maybe like a "Recent New Articles"
3413                         # or "Breaking news" one). For this, we see if $wgOverrideSiteFeed is defined.
3414                         # If so, use it instead.
3415                         $sitename = $config->get( 'Sitename' );
3416                         if ( $config->get( 'OverrideSiteFeed' ) ) {
3417                                 foreach ( $config->get( 'OverrideSiteFeed' ) as $type => $feedUrl ) {
3418                                         // Note, this->feedLink escapes the url.
3419                                         $tags[] = $this->feedLink(
3420                                                 $type,
3421                                                 $feedUrl,
3422                                                 $this->msg( "site-{$type}-feed", $sitename )->text()
3423                                         );
3424                                 }
3425                         } elseif ( !$this->getTitle()->isSpecial( 'Recentchanges' ) ) {
3426                                 $rctitle = SpecialPage::getTitleFor( 'Recentchanges' );
3427                                 foreach ( $config->get( 'AdvertisedFeedTypes' ) as $format ) {
3428                                         $tags[] = $this->feedLink(
3429                                                 $format,
3430                                                 $rctitle->getLocalURL( array( 'feed' => $format ) ),
3431                                                 # For grep: 'site-rss-feed', 'site-atom-feed'
3432                                                 $this->msg( "site-{$format}-feed", $sitename )->text()
3433                                         );
3434                                 }
3435                         }
3436                 }
3437
3438                 # Canonical URL
3439                 if ( $config->get( 'EnableCanonicalServerLink' ) ) {
3440                         if ( $canonicalUrl !== false ) {
3441                                 $canonicalUrl = wfExpandUrl( $canonicalUrl, PROTO_CANONICAL );
3442                         } else {
3443                                 $reqUrl = $this->getRequest()->getRequestURL();
3444                                 $canonicalUrl = wfExpandUrl( $reqUrl, PROTO_CANONICAL );
3445                         }
3446                 }
3447                 if ( $canonicalUrl !== false ) {
3448                         $tags[] = Html::element( 'link', array(
3449                                 'rel' => 'canonical',
3450                                 'href' => $canonicalUrl
3451                         ) );
3452                 }
3453
3454                 return $tags;
3455         }
3456
3457         /**
3458          * @return string HTML tag links to be put in the header.
3459          * @deprecated since 1.24 Use OutputPage::headElement or if you have to,
3460          *   OutputPage::getHeadLinksArray directly.
3461          */
3462         public function getHeadLinks() {
3463                 wfDeprecated( __METHOD__, '1.24' );
3464                 return implode( "\n", $this->getHeadLinksArray() );
3465         }
3466
3467         /**
3468          * Generate a "<link rel/>" for a feed.
3469          *
3470          * @param string $type Feed type
3471          * @param string $url URL to the feed
3472          * @param string $text Value of the "title" attribute
3473          * @return string HTML fragment
3474          */
3475         private function feedLink( $type, $url, $text ) {
3476                 return Html::element( 'link', array(
3477                         'rel' => 'alternate',
3478                         'type' => "application/$type+xml",
3479                         'title' => $text,
3480                         'href' => $url )
3481                 );
3482         }
3483
3484         /**
3485          * Add a local or specified stylesheet, with the given media options.
3486          * Meant primarily for internal use...
3487          *
3488          * @param string $style URL to the file
3489          * @param string $media To specify a media type, 'screen', 'printable', 'handheld' or any.
3490          * @param string $condition For IE conditional comments, specifying an IE version
3491          * @param string $dir Set to 'rtl' or 'ltr' for direction-specific sheets
3492          */
3493         public function addStyle( $style, $media = '', $condition = '', $dir = '' ) {
3494                 $options = array();
3495                 // Even though we expect the media type to be lowercase, but here we
3496                 // force it to lowercase to be safe.
3497                 if ( $media ) {
3498                         $options['media'] = $media;
3499                 }
3500                 if ( $condition ) {
3501                         $options['condition'] = $condition;
3502                 }
3503                 if ( $dir ) {
3504                         $options['dir'] = $dir;
3505                 }
3506                 $this->styles[$style] = $options;
3507         }
3508
3509         /**
3510          * Adds inline CSS styles
3511          * @param mixed $style_css Inline CSS
3512          * @param string $flip Set to 'flip' to flip the CSS if needed
3513          */
3514         public function addInlineStyle( $style_css, $flip = 'noflip' ) {
3515                 if ( $flip === 'flip' && $this->getLanguage()->isRTL() ) {
3516                         # If wanted, and the interface is right-to-left, flip the CSS
3517                         $style_css = CSSJanus::transform( $style_css, true, false );
3518                 }
3519                 $this->mInlineStyles .= Html::inlineStyle( $style_css ) . "\n";
3520         }
3521
3522         /**
3523          * Build a set of "<link>" elements for the stylesheets specified in the $this->styles array.
3524          * These will be applied to various media & IE conditionals.
3525          *
3526          * @return string
3527          */
3528         public function buildCssLinks() {
3529                 global $wgContLang;
3530
3531                 $this->getSkin()->setupSkinUserCss( $this );
3532
3533                 // Add ResourceLoader styles
3534                 // Split the styles into these groups
3535                 $styles = array(
3536                         'other' => array(),
3537                         'user' => array(),
3538                         'site' => array(),
3539                         'private' => array(),
3540                         'noscript' => array()
3541                 );
3542                 $links = array();
3543                 $otherTags = ''; // Tags to append after the normal <link> tags
3544                 $resourceLoader = $this->getResourceLoader();
3545
3546                 $moduleStyles = $this->getModuleStyles();
3547
3548                 // Per-site custom styles
3549                 $moduleStyles[] = 'site';
3550                 $moduleStyles[] = 'noscript';
3551                 $moduleStyles[] = 'user.groups';
3552
3553                 // Per-user custom styles
3554                 if ( $this->getConfig()->get( 'AllowUserCss' ) && $this->getTitle()->isCssSubpage()
3555                         && $this->userCanPreview()
3556                 ) {
3557                         // We're on a preview of a CSS subpage
3558                         // Exclude this page from the user module in case it's in there (bug 26283)
3559                         $link = $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_STYLES, false,
3560                                 array( 'excludepage' => $this->getTitle()->getPrefixedDBkey() )
3561                         );
3562                         $otherTags .= $link['html'];
3563
3564                         // Load the previewed CSS
3565                         // If needed, Janus it first. This is user-supplied CSS, so it's
3566                         // assumed to be right for the content language directionality.
3567                         $previewedCSS = $this->getRequest()->getText( 'wpTextbox1' );
3568                         if ( $this->getLanguage()->getDir() !== $wgContLang->getDir() ) {
3569                                 $previewedCSS = CSSJanus::transform( $previewedCSS, true, false );
3570                         }
3571                         $otherTags .= Html::inlineStyle( $previewedCSS ) . "\n";
3572                 } else {
3573                         // Load the user styles normally
3574                         $moduleStyles[] = 'user';
3575                 }
3576
3577                 // Per-user preference styles
3578                 $moduleStyles[] = 'user.cssprefs';
3579
3580                 foreach ( $moduleStyles as $name ) {
3581                         $module = $resourceLoader->getModule( $name );
3582                         if ( !$module ) {
3583                                 continue;
3584                         }
3585                         $group = $module->getGroup();
3586                         // Modules in groups different than the ones listed on top (see $styles assignment)
3587                         // will be placed in the "other" group
3588                         $styles[isset( $styles[$group] ) ? $group : 'other'][] = $name;
3589                 }
3590
3591                 // We want site, private and user styles to override dynamically added
3592                 // styles from modules, but we want dynamically added styles to override
3593                 // statically added styles from other modules. So the order has to be
3594                 // other, dynamic, site, private, user. Add statically added styles for
3595                 // other modules
3596                 $links[] = $this->makeResourceLoaderLink( $styles['other'], ResourceLoaderModule::TYPE_STYLES );
3597                 // Add normal styles added through addStyle()/addInlineStyle() here
3598                 $links[] = implode( "\n", $this->buildCssLinksArray() ) . $this->mInlineStyles;
3599                 // Add marker tag to mark the place where the client-side loader should inject dynamic styles
3600                 // We use a <meta> tag with a made-up name for this because that's valid HTML
3601                 $links[] = Html::element(
3602                         'meta',
3603                         array( 'name' => 'ResourceLoaderDynamicStyles', 'content' => '' )
3604                 ) . "\n";
3605
3606                 // Add site, private and user styles
3607                 // 'private' at present only contains user.options, so put that before 'user'
3608                 // Any future private modules will likely have a similar user-specific character
3609                 foreach ( array( 'site', 'noscript', 'private', 'user' ) as $group ) {
3610                         $links[] = $this->makeResourceLoaderLink( $styles[$group],
3611                                 ResourceLoaderModule::TYPE_STYLES
3612                         );
3613                 }
3614
3615                 // Add stuff in $otherTags (previewed user CSS if applicable)
3616                 return self::getHtmlFromLoaderLinks( $links ) . $otherTags;
3617         }
3618
3619         /**
3620          * @return array
3621          */
3622         public function buildCssLinksArray() {
3623                 $links = array();
3624
3625                 // Add any extension CSS
3626                 foreach ( $this->mExtStyles as $url ) {
3627                         $this->addStyle( $url );
3628                 }
3629                 $this->mExtStyles = array();
3630
3631                 foreach ( $this->styles as $file => $options ) {
3632                         $link = $this->styleLink( $file, $options );
3633                         if ( $link ) {
3634                                 $links[$file] = $link;
3635                         }
3636                 }
3637                 return $links;
3638         }
3639
3640         /**
3641          * Generate \<link\> tags for stylesheets
3642          *
3643          * @param string $style URL to the file
3644          * @param array $options Option, can contain 'condition', 'dir', 'media' keys
3645          * @return string HTML fragment
3646          */
3647         protected function styleLink( $style, array $options ) {
3648                 if ( isset( $options['dir'] ) ) {
3649                         if ( $this->getLanguage()->getDir() != $options['dir'] ) {
3650                                 return '';
3651                         }
3652                 }
3653
3654                 if ( isset( $options['media'] ) ) {
3655                         $media = self::transformCssMedia( $options['media'] );
3656                         if ( is_null( $media ) ) {
3657                                 return '';
3658                         }
3659                 } else {
3660                         $media = 'all';
3661                 }
3662
3663                 if ( substr( $style, 0, 1 ) == '/' ||
3664                         substr( $style, 0, 5 ) == 'http:' ||
3665                         substr( $style, 0, 6 ) == 'https:' ) {
3666                         $url = $style;
3667                 } else {
3668                         $config = $this->getConfig();
3669                         $url = $config->get( 'StylePath' ) . '/' . $style . '?' . $config->get( 'StyleVersion' );
3670                 }
3671
3672                 $link = Html::linkedStyle( $url, $media );
3673
3674                 if ( isset( $options['condition'] ) ) {
3675                         $condition = htmlspecialchars( $options['condition'] );
3676                         $link = "<!--[if $condition]>$link<![endif]-->";
3677                 }
3678                 return $link;
3679         }
3680
3681         /**
3682          * Transform "media" attribute based on request parameters
3683          *
3684          * @param string $media Current value of the "media" attribute
3685          * @return string Modified value of the "media" attribute, or null to skip
3686          * this stylesheet
3687          */
3688         public static function transformCssMedia( $media ) {
3689                 global $wgRequest;
3690
3691                 // http://www.w3.org/TR/css3-mediaqueries/#syntax
3692                 $screenMediaQueryRegex = '/^(?:only\s+)?screen\b/i';
3693
3694                 // Switch in on-screen display for media testing
3695                 $switches = array(
3696                         'printable' => 'print',
3697                         'handheld' => 'handheld',
3698                 );
3699                 foreach ( $switches as $switch => $targetMedia ) {
3700                         if ( $wgRequest->getBool( $switch ) ) {
3701                                 if ( $media == $targetMedia ) {
3702                                         $media = '';
3703                                 } elseif ( preg_match( $screenMediaQueryRegex, $media ) === 1 ) {
3704                                         // This regex will not attempt to understand a comma-separated media_query_list
3705                                         //
3706                                         // Example supported values for $media:
3707                                         // 'screen', 'only screen', 'screen and (min-width: 982px)' ),
3708                                         // Example NOT supported value for $media:
3709                                         // '3d-glasses, screen, print and resolution > 90dpi'
3710                                         //
3711                                         // If it's a print request, we never want any kind of screen stylesheets
3712                                         // If it's a handheld request (currently the only other choice with a switch),
3713                                         // we don't want simple 'screen' but we might want screen queries that
3714                                         // have a max-width or something, so we'll pass all others on and let the
3715                                         // client do the query.
3716                                         if ( $targetMedia == 'print' || $media == 'screen' ) {
3717                                                 return null;
3718                                         }
3719                                 }
3720                         }
3721                 }
3722
3723                 return $media;
3724         }
3725
3726         /**
3727          * Add a wikitext-formatted message to the output.
3728          * This is equivalent to:
3729          *
3730          *    $wgOut->addWikiText( wfMessage( ... )->plain() )
3731          */
3732         public function addWikiMsg( /*...*/ ) {
3733                 $args = func_get_args();
3734                 $name = array_shift( $args );
3735                 $this->addWikiMsgArray( $name, $args );
3736         }
3737
3738         /**
3739          * Add a wikitext-formatted message to the output.
3740          * Like addWikiMsg() except the parameters are taken as an array
3741          * instead of a variable argument list.
3742          *
3743          * @param string $name
3744          * @param array $args
3745          */
3746         public function addWikiMsgArray( $name, $args ) {
3747                 $this->addHTML( $this->msg( $name, $args )->parseAsBlock() );
3748         }
3749
3750         /**
3751          * This function takes a number of message/argument specifications, wraps them in
3752          * some overall structure, and then parses the result and adds it to the output.
3753          *
3754          * In the $wrap, $1 is replaced with the first message, $2 with the second, and so
3755          * on. The subsequent arguments may either be strings, in which case they are the
3756          * message names, or arrays, in which case the first element is the message name,
3757          * and subsequent elements are the parameters to that message.
3758          *
3759          * Don't use this for messages that are not in users interface language.
3760          *
3761          * For example:
3762          *
3763          *    $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>", 'some-error' );
3764          *
3765          * Is equivalent to:
3766          *
3767          *    $wgOut->addWikiText( "<div class='error'>\n"
3768          *        . wfMessage( 'some-error' )->plain() . "\n</div>" );
3769          *
3770          * The newline after opening div is needed in some wikitext. See bug 19226.
3771          *
3772          * @param string $wrap
3773          */
3774         public function wrapWikiMsg( $wrap /*, ...*/ ) {
3775                 $msgSpecs = func_get_args();
3776                 array_shift( $msgSpecs );
3777                 $msgSpecs = array_values( $msgSpecs );
3778                 $s = $wrap;
3779                 foreach ( $msgSpecs as $n => $spec ) {
3780                         if ( is_array( $spec ) ) {
3781                                 $args = $spec;
3782                                 $name = array_shift( $args );
3783                                 if ( isset( $args['options'] ) ) {
3784                                         unset( $args['options'] );
3785                                         wfDeprecated(
3786                                                 'Adding "options" to ' . __METHOD__ . ' is no longer supported',
3787                                                 '1.20'
3788                                         );
3789                                 }
3790                         } else {
3791                                 $args = array();
3792                                 $name = $spec;
3793                         }
3794                         $s = str_replace( '$' . ( $n + 1 ), $this->msg( $name, $args )->plain(), $s );
3795                 }
3796                 $this->addWikiText( $s );
3797         }
3798
3799         /**
3800          * Include jQuery core. Use this to avoid loading it multiple times
3801          * before we get a usable script loader.
3802          *
3803          * @param array $modules List of jQuery modules which should be loaded
3804          * @return array The list of modules which were not loaded.
3805          * @since 1.16
3806          * @deprecated since 1.17
3807          */
3808         public function includeJQuery( array $modules = array() ) {
3809                 return array();
3810         }
3811
3812         /**
3813          * Enables/disables TOC, doesn't override __NOTOC__
3814          * @param bool $flag
3815          * @since 1.22
3816          */
3817         public function enableTOC( $flag = true ) {
3818                 $this->mEnableTOC = $flag;
3819         }
3820
3821         /**
3822          * @return bool
3823          * @since 1.22
3824          */
3825         public function isTOCEnabled() {
3826                 return $this->mEnableTOC;
3827         }
3828
3829         /**
3830          * Enables/disables section edit links, doesn't override __NOEDITSECTION__
3831          * @param bool $flag
3832          * @since 1.23
3833          */
3834         public function enableSectionEditLinks( $flag = true ) {
3835                 $this->mEnableSectionEditLinks = $flag;
3836         }
3837
3838         /**
3839          * @return bool
3840          * @since 1.23
3841          */
3842         public function sectionEditLinksEnabled() {
3843                 return $this->mEnableSectionEditLinks;
3844         }
3845 }