includes/OutputPage.php

   1 <?php
   2 /**
   3  * Preparation for the final page rendering.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 /**
  24  * This class should be covered by a general architecture document which does
  25  * not exist as of January 2011.  This is one of the Core classes and should
  26  * be read at least once by any new developers.
  27  *
  28  * This class is used to prepare the final rendering. A skin is then
  29  * applied to the output parameters (links, javascript, html, categories ...).
  30  *
  31  * @todo FIXME: Another class handles sending the whole page to the client.
  32  *
  33  * Some comments comes from a pairing session between Zak Greant and Antoine Musso
  34  * in November 2010.
  35  *
  36  * @todo document
  37  */
  38 class OutputPage extends ContextSource {
  39         /** @var array Should be private. Used with addMeta() which adds "<meta>" */
  40         protected $mMetatags = array();
  41
  42         /** @var array */
  43         protected $mLinktags = array();
  44
  45         /** @var bool */
  46         protected $mCanonicalUrl = false;
  47
  48         /**
  49          * @var array Additional stylesheets. Looks like this is for extensions.
  50          *   Might be replaced by resource loader.
  51          */
  52         protected $mExtStyles = array();
  53
  54         /**
  55          * @var string Should be private - has getter and setter. Contains
  56          *   the HTML title */
  57         public $mPagetitle = '';
  58
  59         /**
  60          * @var string Contains all of the "<body>" content. Should be private we
  61          *   got set/get accessors and the append() method.
  62          */
  63         public $mBodytext = '';
  64
  65         /**
  66          * Holds the debug lines that will be output as comments in page source if
  67          * $wgDebugComments is enabled. See also $wgShowDebug.
  68          * @deprecated since 1.20; use MWDebug class instead.
  69          */
  70         public $mDebugtext = '';
  71
  72         /** @var string Stores contents of "<title>" tag */
  73         private $mHTMLtitle = '';
  74
  75         /**
  76          * @var bool Is the displayed content related to the source of the
  77          *   corresponding wiki article.
  78          */
  79         private $mIsarticle = false;
  80
  81         /** @var bool Stores "article flag" toggle. */
  82         private $mIsArticleRelated = true;
  83
  84         /**
  85          * @var bool We have to set isPrintable(). Some pages should
  86          * never be printed (ex: redirections).
  87          */
  88         private $mPrintable = false;
  89
  90         /**
  91          * @var array Contains the page subtitle. Special pages usually have some
  92          *   links here. Don't confuse with site subtitle added by skins.
  93          */
  94         private $mSubtitle = array();
  95
  96         /** @var string */
  97         public $mRedirect = '';
  98
  99         /** @var int */
 100         protected $mStatusCode;
 101
 102         /**
 103          * @var string Variable mLastModified and mEtag are used for sending cache control.
 104          *   The whole caching system should probably be moved into its own class.
 105          */
 106         protected $mLastModified = '';
 107
 108         /**
 109          * Contains an HTTP Entity Tags (see RFC 2616 section 3.13) which is used
 110          * as a unique identifier for the content. It is later used by the client
 111          * to compare its cached version with the server version. Client sends
 112          * headers If-Match and If-None-Match containing its locally cached ETAG value.
 113          *
 114          * To get more information, you will have to look at HTTP/1.1 protocol which
 115          * is properly described in RFC 2616 : http://tools.ietf.org/html/rfc2616
 116          */
 117         private $mETag = false;
 118
 119         /** @var array */
 120         protected $mCategoryLinks = array();
 121
 122         /** @var array */
 123         protected $mCategories = array();
 124
 125         /** @var array Array of Interwiki Prefixed (non DB key) Titles (e.g. 'fr:Test page') */
 126         private $mLanguageLinks = array();
 127
 128         /**
 129          * Used for JavaScript (pre resource loader)
 130          * @todo We should split JS / CSS.
 131          * mScripts content is inserted as is in "<head>" by Skin. This might
 132          * contain either a link to a stylesheet or inline CSS.
 133          */
 134         private $mScripts = '';
 135
 136         /** @var string Inline CSS styles. Use addInlineStyle() sparingly */
 137         protected $mInlineStyles = '';
 138
 139         /** @todo Unused? */
 140         private $mLinkColours;
 141
 142         /**
 143          * @var string Used by skin template.
 144          * Example: $tpl->set( 'displaytitle', $out->mPageLinkTitle );
 145          */
 146         public $mPageLinkTitle = '';
 147
 148         /** @var array Array of elements in "<head>". Parser might add its own headers! */
 149         protected $mHeadItems = array();
 150
 151         // @todo FIXME: Next 5 variables probably come from the resource loader
 152
 153         /** @var array */
 154         protected $mModules = array();
 155
 156         /** @var array */
 157         protected $mModuleScripts = array();
 158
 159         /** @var array */
 160         protected $mModuleStyles = array();
 161
 162         /** @var array */
 163         protected $mModuleMessages = array();
 164
 165         /** @var ResourceLoader */
 166         protected $mResourceLoader;
 167
 168         /** @var array */
 169         protected $mJsConfigVars = array();
 170
 171         /** @var array */
 172         protected $mTemplateIds = array();
 173
 174         /** @var array */
 175         protected $mImageTimeKeys = array();
 176
 177         /** @var string */
 178         public $mRedirectCode = '';
 179
 180         protected $mFeedLinksAppendQuery = null;
 181
 182         /**
 183          * @var int
 184          * The level of 'untrustworthiness' allowed for modules loaded on this page.
 185          * @see ResourceLoaderModule::$origin
 186          */
 187         protected $mAllowedModuleOrigin = ResourceLoaderModule::ORIGIN_ALL;
 188
 189         /** @var bool Whether output is disabled.  If this is true, the 'output' method will do nothing. */
 190         protected $mDoNothing = false;
 191
 192         // Parser related.
 193
 194         /**
 195          * @var int
 196          * @todo Unused?
 197          */
 198         private $mContainsOldMagic = 0;
 199
 200         /** @var int */
 201         protected $mContainsNewMagic = 0;
 202
 203         /**
 204          * lazy initialised, use parserOptions()
 205          * @var ParserOptions
 206          */
 207         protected $mParserOptions = null;
 208
 209         /**
 210          * Handles the Atom / RSS links.
 211          * We probably only support Atom in 2011.
 212          * @see $wgAdvertisedFeedTypes
 213          */
 214         private $mFeedLinks = array();
 215
 216         // Gwicke work on squid caching? Roughly from 2003.
 217         protected $mEnableClientCache = true;
 218
 219         /** @var bool Flag if output should only contain the body of the article. */
 220         private $mArticleBodyOnly = false;
 221
 222         /** @var bool */
 223         protected $mNewSectionLink = false;
 224
 225         /** @var bool */
 226         protected $mHideNewSectionLink = false;
 227
 228         /**
 229          * @var bool Comes from the parser. This was probably made to load CSS/JS
 230          * only if we had "<gallery>". Used directly in CategoryPage.php.
 231          * Looks like resource loader can replace this.
 232          */
 233         public $mNoGallery = false;
 234
 235         /** @var string */
 236         private $mPageTitleActionText = '';
 237
 238         /** @var array */
 239         private $mParseWarnings = array();
 240
 241         /** @var int Cache stuff. Looks like mEnableClientCache */
 242         protected $mSquidMaxage = 0;
 243
 244         /**
 245          * @var bool
 246          * @todo Document
 247          */
 248         protected $mPreventClickjacking = true;
 249
 250         /** @var int To include the variable {{REVISIONID}} */
 251         private $mRevisionId = null;
 252
 253         /** @var string */
 254         private $mRevisionTimestamp = null;
 255
 256         /** @var array */
 257         protected $mFileVersion = null;
 258
 259         /**
 260          * @var array An array of stylesheet filenames (relative from skins path),
 261          * with options for CSS media, IE conditions, and RTL/LTR direction.
 262          * For internal use; add settings in the skin via $this->addStyle()
 263          *
 264          * Style again! This seems like a code duplication since we already have
 265          * mStyles. This is what makes Open Source amazing.
 266          */
 267         protected $styles = array();
 268
 269         /**
 270          * Whether jQuery is already handled.
 271          */
 272         protected $mJQueryDone = false;
 273
 274         private $mIndexPolicy = 'index';
 275         private $mFollowPolicy = 'follow';
 276         private $mVaryHeader = array(
 277                 'Accept-Encoding' => array( 'list-contains=gzip' ),
 278         );
 279
 280         /**
 281          * If the current page was reached through a redirect, $mRedirectedFrom contains the Title
 282          * of the redirect.
 283          *
 284          * @var Title
 285          */
 286         private $mRedirectedFrom = null;
 287
 288         /**
 289          * Additional key => value data
 290          */
 291         private $mProperties = array();
 292
 293         /**
 294          * @var string|null ResourceLoader target for load.php links. If null, will be omitted
 295          */
 296         private $mTarget = null;
 297
 298         /**
 299          * @var bool Whether parser output should contain table of contents
 300          */
 301         private $mEnableTOC = true;
 302
 303         /**
 304          * @var bool Whether parser output should contain section edit links
 305          */
 306         private $mEnableSectionEditLinks = true;
 307
 308         /**
 309          * Constructor for OutputPage. This should not be called directly.
 310          * Instead a new RequestContext should be created and it will implicitly create
 311          * a OutputPage tied to that context.
 312          * @param IContextSource|null $context
 313          */
 314         function __construct( IContextSource $context = null ) {
 315                 if ( $context === null ) {
 316                         # Extensions should use `new RequestContext` instead of `new OutputPage` now.
 317                         wfDeprecated( __METHOD__, '1.18' );
 318                 } else {
 319                         $this->setContext( $context );
 320                 }
 321         }
 322
 323         /**
 324          * Redirect to $url rather than displaying the normal page
 325          *
 326          * @param string $url URL
 327          * @param string $responsecode HTTP status code
 328          */
 329         public function redirect( $url, $responsecode = '302' ) {
 330                 # Strip newlines as a paranoia check for header injection in PHP<5.1.2
 331                 $this->mRedirect = str_replace( "\n", '', $url );
 332                 $this->mRedirectCode = $responsecode;
 333         }
 334
 335         /**
 336          * Get the URL to redirect to, or an empty string if not redirect URL set
 337          *
 338          * @return string
 339          */
 340         public function getRedirect() {
 341                 return $this->mRedirect;
 342         }
 343
 344         /**
 345          * Set the HTTP status code to send with the output.
 346          *
 347          * @param int $statusCode
 348          */
 349         public function setStatusCode( $statusCode ) {
 350                 $this->mStatusCode = $statusCode;
 351         }
 352
 353         /**
 354          * Add a new "<meta>" tag
 355          * To add an http-equiv meta tag, precede the name with "http:"
 356          *
 357          * @param string $name Tag name
 358          * @param string $val Tag value
 359          */
 360         function addMeta( $name, $val ) {
 361                 array_push( $this->mMetatags, array( $name, $val ) );
 362         }
 363
 364         /**
 365          * Add a new \<link\> tag to the page header.
 366          *
 367          * Note: use setCanonicalUrl() for rel=canonical.
 368          *
 369          * @param array $linkarr Associative array of attributes.
 370          */
 371         function addLink( array $linkarr ) {
 372                 array_push( $this->mLinktags, $linkarr );
 373         }
 374
 375         /**
 376          * Add a new \<link\> with "rel" attribute set to "meta"
 377          *
 378          * @param array $linkarr Associative array mapping attribute names to their
 379          *                 values, both keys and values will be escaped, and the
 380          *                 "rel" attribute will be automatically added
 381          */
 382         function addMetadataLink( array $linkarr ) {
 383                 $linkarr['rel'] = $this->getMetadataAttribute();
 384                 $this->addLink( $linkarr );
 385         }
 386
 387         /**
 388          * Set the URL to be used for the <link rel=canonical>. This should be used
 389          * in preference to addLink(), to avoid duplicate link tags.
 390          * @param string $url
 391          */
 392         function setCanonicalUrl( $url ) {
 393                 $this->mCanonicalUrl = $url;
 394         }
 395
 396         /**
 397          * Get the value of the "rel" attribute for metadata links
 398          *
 399          * @return string
 400          */
 401         public function getMetadataAttribute() {
 402                 # note: buggy CC software only reads first "meta" link
 403                 static $haveMeta = false;
 404                 if ( $haveMeta ) {
 405                         return 'alternate meta';
 406                 } else {
 407                         $haveMeta = true;
 408                         return 'meta';
 409                 }
 410         }
 411
 412         /**
 413          * Add raw HTML to the list of scripts (including \<script\> tag, etc.)
 414          *
 415          * @param string $script Raw HTML
 416          */
 417         function addScript( $script ) {
 418                 $this->mScripts .= $script . "\n";
 419         }
 420
 421         /**
 422          * Register and add a stylesheet from an extension directory.
 423          *
 424          * @param string $url Path to sheet.  Provide either a full url (beginning
 425          *             with 'http', etc) or a relative path from the document root
 426          *             (beginning with '/').  Otherwise it behaves identically to
 427          *             addStyle() and draws from the /skins folder.
 428          */
 429         public function addExtensionStyle( $url ) {
 430                 array_push( $this->mExtStyles, $url );
 431         }
 432
 433         /**
 434          * Get all styles added by extensions
 435          *
 436          * @return array
 437          */
 438         function getExtStyle() {
 439                 return $this->mExtStyles;
 440         }
 441
 442         /**
 443          * Add a JavaScript file out of skins/common, or a given relative path.
 444          *
 445          * @param string $file Filename in skins/common or complete on-server path
 446          *              (/foo/bar.js)
 447          * @param string $version Style version of the file. Defaults to $wgStyleVersion
 448          */
 449         public function addScriptFile( $file, $version = null ) {
 450                 // See if $file parameter is an absolute URL or begins with a slash
 451                 if ( substr( $file, 0, 1 ) == '/' || preg_match( '#^[a-z]*://#i', $file ) ) {
 452                         $path = $file;
 453                 } else {
 454                         $path = $this->getConfig()->get( 'StylePath' ) . "/common/{$file}";
 455                 }
 456                 if ( is_null( $version ) ) {
 457                         $version = $this->getConfig()->get( 'StyleVersion' );
 458                 }
 459                 $this->addScript( Html::linkedScript( wfAppendQuery( $path, $version ) ) );
 460         }
 461
 462         /**
 463          * Add a self-contained script tag with the given contents
 464          *
 465          * @param string $script JavaScript text, no "<script>" tags
 466          */
 467         public function addInlineScript( $script ) {
 468                 $this->mScripts .= Html::inlineScript( "\n$script\n" ) . "\n";
 469         }
 470
 471         /**
 472          * Get all registered JS and CSS tags for the header.
 473          *
 474          * @return string
 475          * @deprecated since 1.24 Use OutputPage::headElement to build the full header.
 476          */
 477         function getScript() {
 478                 wfDeprecated( __METHOD__, '1.24' );
 479                 return $this->mScripts . $this->getHeadItems();
 480         }
 481
 482         /**
 483          * Filter an array of modules to remove insufficiently trustworthy members, and modules
 484          * which are no longer registered (eg a page is cached before an extension is disabled)
 485          * @param array $modules
 486          * @param string|null $position If not null, only return modules with this position
 487          * @param string $type
 488          * @return array
 489          */
 490         protected function filterModules( array $modules, $position = null,
 491                 $type = ResourceLoaderModule::TYPE_COMBINED
 492         ) {
 493                 $resourceLoader = $this->getResourceLoader();
 494                 $filteredModules = array();
 495                 foreach ( $modules as $val ) {
 496                         $module = $resourceLoader->getModule( $val );
 497                         if ( $module instanceof ResourceLoaderModule
 498                                 && $module->getOrigin() <= $this->getAllowedModules( $type )
 499                                 && ( is_null( $position ) || $module->getPosition() == $position )
 500                                 && ( !$this->mTarget || in_array( $this->mTarget, $module->getTargets() ) )
 501                         ) {
 502                                 $filteredModules[] = $val;
 503                         }
 504                 }
 505                 return $filteredModules;
 506         }
 507
 508         /**
 509          * Get the list of modules to include on this page
 510          *
 511          * @param bool $filter Whether to filter out insufficiently trustworthy modules
 512          * @param string|null $position If not null, only return modules with this position
 513          * @param string $param
 514          * @return array Array of module names
 515          */
 516         public function getModules( $filter = false, $position = null, $param = 'mModules' ) {
 517                 $modules = array_values( array_unique( $this->$param ) );
 518                 return $filter
 519                         ? $this->filterModules( $modules, $position )
 520                         : $modules;
 521         }
 522
 523         /**
 524          * Add one or more modules recognized by the resource loader. Modules added
 525          * through this function will be loaded by the resource loader when the
 526          * page loads.
 527          *
 528          * @param string|array $modules Module name (string) or array of module names
 529          */
 530         public function addModules( $modules ) {
 531                 $this->mModules = array_merge( $this->mModules, (array)$modules );
 532         }
 533
 534         /**
 535          * Get the list of module JS to include on this page
 536          *
 537          * @param bool $filter
 538          * @param string|null $position
 539          *
 540          * @return array Array of module names
 541          */
 542         public function getModuleScripts( $filter = false, $position = null ) {
 543                 return $this->getModules( $filter, $position, 'mModuleScripts' );
 544         }
 545
 546         /**
 547          * Add only JS of one or more modules recognized by the resource loader. Module
 548          * scripts added through this function will be loaded by the resource loader when
 549          * the page loads.
 550          *
 551          * @param string|array $modules Module name (string) or array of module names
 552          */
 553         public function addModuleScripts( $modules ) {
 554                 $this->mModuleScripts = array_merge( $this->mModuleScripts, (array)$modules );
 555         }
 556
 557         /**
 558          * Get the list of module CSS to include on this page
 559          *
 560          * @param bool $filter
 561          * @param string|null $position
 562          *
 563          * @return array Array of module names
 564          */
 565         public function getModuleStyles( $filter = false, $position = null ) {
 566                 return $this->getModules( $filter, $position, 'mModuleStyles' );
 567         }
 568
 569         /**
 570          * Add only CSS of one or more modules recognized by the resource loader.
 571          *
 572          * Module styles added through this function will be added using standard link CSS
 573          * tags, rather than as a combined Javascript and CSS package. Thus, they will
 574          * load when JavaScript is disabled (unless CSS also happens to be disabled).
 575          *
 576          * @param string|array $modules Module name (string) or array of module names
 577          */
 578         public function addModuleStyles( $modules ) {
 579                 $this->mModuleStyles = array_merge( $this->mModuleStyles, (array)$modules );
 580         }
 581
 582         /**
 583          * Get the list of module messages to include on this page
 584          *
 585          * @param bool $filter
 586          * @param string|null $position
 587          *
 588          * @return array Array of module names
 589          */
 590         public function getModuleMessages( $filter = false, $position = null ) {
 591                 return $this->getModules( $filter, $position, 'mModuleMessages' );
 592         }
 593
 594         /**
 595          * Add only messages of one or more modules recognized by the resource loader.
 596          * Module messages added through this function will be loaded by the resource
 597          * loader when the page loads.
 598          *
 599          * @param string|array $modules Module name (string) or array of module names
 600          */
 601         public function addModuleMessages( $modules ) {
 602                 $this->mModuleMessages = array_merge( $this->mModuleMessages, (array)$modules );
 603         }
 604
 605         /**
 606          * @return null|string ResourceLoader target
 607          */
 608         public function getTarget() {
 609                 return $this->mTarget;
 610         }
 611
 612         /**
 613          * Sets ResourceLoader target for load.php links. If null, will be omitted
 614          *
 615          * @param string|null $target
 616          */
 617         public function setTarget( $target ) {
 618                 $this->mTarget = $target;
 619         }
 620
 621         /**
 622          * Get an array of head items
 623          *
 624          * @return array
 625          */
 626         function getHeadItemsArray() {
 627                 return $this->mHeadItems;
 628         }
 629
 630         /**
 631          * Get all header items in a string
 632          *
 633          * @return string
 634          * @deprecated since 1.24 Use OutputPage::headElement or
 635          *   if absolutely necessary use OutputPage::getHeadItemsArray
 636          */
 637         function getHeadItems() {
 638                 wfDeprecated( __METHOD__, '1.24' );
 639                 $s = '';
 640                 foreach ( $this->mHeadItems as $item ) {
 641                         $s .= $item;
 642                 }
 643                 return $s;
 644         }
 645
 646         /**
 647          * Add or replace an header item to the output
 648          *
 649          * @param string $name Item name
 650          * @param string $value Raw HTML
 651          */
 652         public function addHeadItem( $name, $value ) {
 653                 $this->mHeadItems[$name] = $value;
 654         }
 655
 656         /**
 657          * Check if the header item $name is already set
 658          *
 659          * @param string $name Item name
 660          * @return bool
 661          */
 662         public function hasHeadItem( $name ) {
 663                 return isset( $this->mHeadItems[$name] );
 664         }
 665
 666         /**
 667          * Set the value of the ETag HTTP header, only used if $wgUseETag is true
 668          *
 669          * @param string $tag Value of "ETag" header
 670          */
 671         function setETag( $tag ) {
 672                 $this->mETag = $tag;
 673         }
 674
 675         /**
 676          * Set whether the output should only contain the body of the article,
 677          * without any skin, sidebar, etc.
 678          * Used e.g. when calling with "action=render".
 679          *
 680          * @param bool $only Whether to output only the body of the article
 681          */
 682         public function setArticleBodyOnly( $only ) {
 683                 $this->mArticleBodyOnly = $only;
 684         }
 685
 686         /**
 687          * Return whether the output will contain only the body of the article
 688          *
 689          * @return bool
 690          */
 691         public function getArticleBodyOnly() {
 692                 return $this->mArticleBodyOnly;
 693         }
 694
 695         /**
 696          * Set an additional output property
 697          * @since 1.21
 698          *
 699          * @param string $name
 700          * @param mixed $value
 701          */
 702         public function setProperty( $name, $value ) {
 703                 $this->mProperties[$name] = $value;
 704         }
 705
 706         /**
 707          * Get an additional output property
 708          * @since 1.21
 709          *
 710          * @param string $name
 711          * @return mixed Property value or null if not found
 712          */
 713         public function getProperty( $name ) {
 714                 if ( isset( $this->mProperties[$name] ) ) {
 715                         return $this->mProperties[$name];
 716                 } else {
 717                         return null;
 718                 }
 719         }
 720
 721         /**
 722          * checkLastModified tells the client to use the client-cached page if
 723          * possible. If successful, the OutputPage is disabled so that
 724          * any future call to OutputPage->output() have no effect.
 725          *
 726          * Side effect: sets mLastModified for Last-Modified header
 727          *
 728          * @param string $timestamp
 729          *
 730          * @return bool True if cache-ok headers was sent.
 731          */
 732         public function checkLastModified( $timestamp ) {
 733                 if ( !$timestamp || $timestamp == '19700101000000' ) {
 734                         wfDebug( __METHOD__ . ": CACHE DISABLED, NO TIMESTAMP\n" );
 735                         return false;
 736                 }
 737                 $config = $this->getConfig();
 738                 if ( !$config->get( 'CachePages' ) ) {
 739                         wfDebug( __METHOD__ . ": CACHE DISABLED\n" );
 740                         return false;
 741                 }
 742
 743                 $timestamp = wfTimestamp( TS_MW, $timestamp );
 744                 $modifiedTimes = array(
 745                         'page' => $timestamp,
 746                         'user' => $this->getUser()->getTouched(),
 747                         'epoch' => $config->get( 'CacheEpoch' )
 748                 );
 749                 if ( $config->get( 'UseSquid' ) ) {
 750                         // bug 44570: the core page itself may not change, but resources might
 751                         $modifiedTimes['sepoch'] = wfTimestamp( TS_MW, time() - $config->get( 'SquidMaxage' ) );
 752                 }
 753                 wfRunHooks( 'OutputPageCheckLastModified', array( &$modifiedTimes ) );
 754
 755                 $maxModified = max( $modifiedTimes );
 756                 $this->mLastModified = wfTimestamp( TS_RFC2822, $maxModified );
 757
 758                 $clientHeader = $this->getRequest()->getHeader( 'If-Modified-Since' );
 759                 if ( $clientHeader === false ) {
 760                         wfDebug( __METHOD__ . ": client did not send If-Modified-Since header\n", 'log' );
 761                         return false;
 762                 }
 763
 764                 # IE sends sizes after the date like this:
 765                 # Wed, 20 Aug 2003 06:51:19 GMT; length=5202
 766                 # this breaks strtotime().
 767                 $clientHeader = preg_replace( '/;.*$/', '', $clientHeader );
 768
 769                 wfSuppressWarnings(); // E_STRICT system time bitching
 770                 $clientHeaderTime = strtotime( $clientHeader );
 771                 wfRestoreWarnings();
 772                 if ( !$clientHeaderTime ) {
 773                         wfDebug( __METHOD__
 774                                 . ": unable to parse the client's If-Modified-Since header: $clientHeader\n" );
 775                         return false;
 776                 }
 777                 $clientHeaderTime = wfTimestamp( TS_MW, $clientHeaderTime );
 778
 779                 # Make debug info
 780                 $info = '';
 781                 foreach ( $modifiedTimes as $name => $value ) {
 782                         if ( $info !== '' ) {
 783                                 $info .= ', ';
 784                         }
 785                         $info .= "$name=" . wfTimestamp( TS_ISO_8601, $value );
 786                 }
 787
 788                 wfDebug( __METHOD__ . ": client sent If-Modified-Since: " .
 789                         wfTimestamp( TS_ISO_8601, $clientHeaderTime ) . "\n", 'log' );
 790                 wfDebug( __METHOD__ . ": effective Last-Modified: " .
 791                         wfTimestamp( TS_ISO_8601, $maxModified ) . "\n", 'log' );
 792                 if ( $clientHeaderTime < $maxModified ) {
 793                         wfDebug( __METHOD__ . ": STALE, $info\n", 'log' );
 794                         return false;
 795                 }
 796
 797                 # Not modified
 798                 # Give a 304 response code and disable body output
 799                 wfDebug( __METHOD__ . ": NOT MODIFIED, $info\n", 'log' );
 800                 ini_set( 'zlib.output_compression', 0 );
 801                 $this->getRequest()->response()->header( "HTTP/1.1 304 Not Modified" );
 802                 $this->sendCacheControl();
 803                 $this->disable();
 804
 805                 // Don't output a compressed blob when using ob_gzhandler;
 806                 // it's technically against HTTP spec and seems to confuse
 807                 // Firefox when the response gets split over two packets.
 808                 wfClearOutputBuffers();
 809
 810                 return true;
 811         }
 812
 813         /**
 814          * Override the last modified timestamp
 815          *
 816          * @param string $timestamp New timestamp, in a format readable by
 817          *        wfTimestamp()
 818          */
 819         public function setLastModified( $timestamp ) {
 820                 $this->mLastModified = wfTimestamp( TS_RFC2822, $timestamp );
 821         }
 822
 823         /**
 824          * Set the robot policy for the page: <http://www.robotstxt.org/meta.html>
 825          *
 826          * @param string $policy The literal string to output as the contents of
 827          *   the meta tag.  Will be parsed according to the spec and output in
 828          *   standardized form.
 829          * @return null
 830          */
 831         public function setRobotPolicy( $policy ) {
 832                 $policy = Article::formatRobotPolicy( $policy );
 833
 834                 if ( isset( $policy['index'] ) ) {
 835                         $this->setIndexPolicy( $policy['index'] );
 836                 }
 837                 if ( isset( $policy['follow'] ) ) {
 838                         $this->setFollowPolicy( $policy['follow'] );
 839                 }
 840         }
 841
 842         /**
 843          * Set the index policy for the page, but leave the follow policy un-
 844          * touched.
 845          *
 846          * @param string $policy Either 'index' or 'noindex'.
 847          * @return null
 848          */
 849         public function setIndexPolicy( $policy ) {
 850                 $policy = trim( $policy );
 851                 if ( in_array( $policy, array( 'index', 'noindex' ) ) ) {
 852                         $this->mIndexPolicy = $policy;
 853                 }
 854         }
 855
 856         /**
 857          * Set the follow policy for the page, but leave the index policy un-
 858          * touched.
 859          *
 860          * @param string $policy Either 'follow' or 'nofollow'.
 861          * @return null
 862          */
 863         public function setFollowPolicy( $policy ) {
 864                 $policy = trim( $policy );
 865                 if ( in_array( $policy, array( 'follow', 'nofollow' ) ) ) {
 866                         $this->mFollowPolicy = $policy;
 867                 }
 868         }
 869
 870         /**
 871          * Set the new value of the "action text", this will be added to the
 872          * "HTML title", separated from it with " - ".
 873          *
 874          * @param string $text New value of the "action text"
 875          */
 876         public function setPageTitleActionText( $text ) {
 877                 $this->mPageTitleActionText = $text;
 878         }
 879
 880         /**
 881          * Get the value of the "action text"
 882          *
 883          * @return string
 884          */
 885         public function getPageTitleActionText() {
 886                 return $this->mPageTitleActionText;
 887         }
 888
 889         /**
 890          * "HTML title" means the contents of "<title>".
 891          * It is stored as plain, unescaped text and will be run through htmlspecialchars in the skin file.
 892          *
 893          * @param string|Message $name
 894          */
 895         public function setHTMLTitle( $name ) {
 896                 if ( $name instanceof Message ) {
 897                         $this->mHTMLtitle = $name->setContext( $this->getContext() )->text();
 898                 } else {
 899                         $this->mHTMLtitle = $name;
 900                 }
 901         }
 902
 903         /**
 904          * Return the "HTML title", i.e. the content of the "<title>" tag.
 905          *
 906          * @return string
 907          */
 908         public function getHTMLTitle() {
 909                 return $this->mHTMLtitle;
 910         }
 911
 912         /**
 913          * Set $mRedirectedFrom, the Title of the page which redirected us to the current page.
 914          *
 915          * @param Title $t
 916          */
 917         public function setRedirectedFrom( $t ) {
 918                 $this->mRedirectedFrom = $t;
 919         }
 920
 921         /**
 922          * "Page title" means the contents of \<h1\>. It is stored as a valid HTML
 923          * fragment. This function allows good tags like \<sup\> in the \<h1\> tag,
 924          * but not bad tags like \<script\>. This function automatically sets
 925          * \<title\> to the same content as \<h1\> but with all tags removed. Bad
 926          * tags that were escaped in \<h1\> will still be escaped in \<title\>, and
 927          * good tags like \<i\> will be dropped entirely.
 928          *
 929          * @param string|Message $name
 930          */
 931         public function setPageTitle( $name ) {
 932                 if ( $name instanceof Message ) {
 933                         $name = $name->setContext( $this->getContext() )->text();
 934                 }
 935
 936                 # change "<script>foo&bar</script>" to "&lt;script&gt;foo&amp;bar&lt;/script&gt;"
 937                 # but leave "<i>foobar</i>" alone
 938                 $nameWithTags = Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags( $name ) );
 939                 $this->mPagetitle = $nameWithTags;
 940
 941                 # change "<i>foo&amp;bar</i>" to "foo&bar"
 942                 $this->setHTMLTitle(
 943                         $this->msg( 'pagetitle' )->rawParams( Sanitizer::stripAllTags( $nameWithTags ) )
 944                                 ->inContentLanguage()
 945                 );
 946         }
 947
 948         /**
 949          * Return the "page title", i.e. the content of the \<h1\> tag.
 950          *
 951          * @return string
 952          */
 953         public function getPageTitle() {
 954                 return $this->mPagetitle;
 955         }
 956
 957         /**
 958          * Set the Title object to use
 959          *
 960          * @param Title $t
 961          */
 962         public function setTitle( Title $t ) {
 963                 $this->getContext()->setTitle( $t );
 964         }
 965
 966         /**
 967          * Replace the subtitle with $str
 968          *
 969          * @param string|Message $str New value of the subtitle. String should be safe HTML.
 970          */
 971         public function setSubtitle( $str ) {
 972                 $this->clearSubtitle();
 973                 $this->addSubtitle( $str );
 974         }
 975
 976         /**
 977          * Add $str to the subtitle
 978          *
 979          * @deprecated since 1.19; use addSubtitle() instead
 980          * @param string|Message $str String or Message to add to the subtitle
 981          */
 982         public function appendSubtitle( $str ) {
 983                 $this->addSubtitle( $str );
 984         }
 985
 986         /**
 987          * Add $str to the subtitle
 988          *
 989          * @param string|Message $str String or Message to add to the subtitle. String should be safe HTML.
 990          */
 991         public function addSubtitle( $str ) {
 992                 if ( $str instanceof Message ) {
 993                         $this->mSubtitle[] = $str->setContext( $this->getContext() )->parse();
 994                 } else {
 995                         $this->mSubtitle[] = $str;
 996                 }
 997         }
 998
 999         /**
1000          * Add a subtitle containing a backlink to a page
1001          *
1002          * @param Title $title Title to link to
1003          * @param array $query Array of additional parameters to include in the link
1004          */
1005         public function addBacklinkSubtitle( Title $title, $query = array() ) {
1006                 if ( $title->isRedirect() ) {
1007                         $query['redirect'] = 'no';
1008                 }
1009                 $this->addSubtitle( $this->msg( 'backlinksubtitle' )
1010                         ->rawParams( Linker::link( $title, null, array(), $query ) ) );
1011         }
1012
1013         /**
1014          * Clear the subtitles
1015          */
1016         public function clearSubtitle() {
1017                 $this->mSubtitle = array();
1018         }
1019
1020         /**
1021          * Get the subtitle
1022          *
1023          * @return string
1024          */
1025         public function getSubtitle() {
1026                 return implode( "<br />\n\t\t\t\t", $this->mSubtitle );
1027         }
1028
1029         /**
1030          * Set the page as printable, i.e. it'll be displayed with with all
1031          * print styles included
1032          */
1033         public function setPrintable() {
1034                 $this->mPrintable = true;
1035         }
1036
1037         /**
1038          * Return whether the page is "printable"
1039          *
1040          * @return bool
1041          */
1042         public function isPrintable() {
1043                 return $this->mPrintable;
1044         }
1045
1046         /**
1047          * Disable output completely, i.e. calling output() will have no effect
1048          */
1049         public function disable() {
1050                 $this->mDoNothing = true;
1051         }
1052
1053         /**
1054          * Return whether the output will be completely disabled
1055          *
1056          * @return bool
1057          */
1058         public function isDisabled() {
1059                 return $this->mDoNothing;
1060         }
1061
1062         /**
1063          * Show an "add new section" link?
1064          *
1065          * @return bool
1066          */
1067         public function showNewSectionLink() {
1068                 return $this->mNewSectionLink;
1069         }
1070
1071         /**
1072          * Forcibly hide the new section link?
1073          *
1074          * @return bool
1075          */
1076         public function forceHideNewSectionLink() {
1077                 return $this->mHideNewSectionLink;
1078         }
1079
1080         /**
1081          * Add or remove feed links in the page header
1082          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
1083          * for the new version
1084          * @see addFeedLink()
1085          *
1086          * @param bool $show True: add default feeds, false: remove all feeds
1087          */
1088         public function setSyndicated( $show = true ) {
1089                 if ( $show ) {
1090                         $this->setFeedAppendQuery( false );
1091                 } else {
1092                         $this->mFeedLinks = array();
1093                 }
1094         }
1095
1096         /**
1097          * Add default feeds to the page header
1098          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
1099          * for the new version
1100          * @see addFeedLink()
1101          *
1102          * @param string $val Query to append to feed links or false to output
1103          *        default links
1104          */
1105         public function setFeedAppendQuery( $val ) {
1106                 $this->mFeedLinks = array();
1107
1108                 foreach ( $this->getConfig()->get( 'AdvertisedFeedTypes' ) as $type ) {
1109                         $query = "feed=$type";
1110                         if ( is_string( $val ) ) {
1111                                 $query .= '&' . $val;
1112                         }
1113                         $this->mFeedLinks[$type] = $this->getTitle()->getLocalURL( $query );
1114                 }
1115         }
1116
1117         /**
1118          * Add a feed link to the page header
1119          *
1120          * @param string $format Feed type, should be a key of $wgFeedClasses
1121          * @param string $href URL
1122          */
1123         public function addFeedLink( $format, $href ) {
1124                 if ( in_array( $format, $this->getConfig()->get( 'AdvertisedFeedTypes' ) ) ) {
1125                         $this->mFeedLinks[$format] = $href;
1126                 }
1127         }
1128
1129         /**
1130          * Should we output feed links for this page?
1131          * @return bool
1132          */
1133         public function isSyndicated() {
1134                 return count( $this->mFeedLinks ) > 0;
1135         }
1136
1137         /**
1138          * Return URLs for each supported syndication format for this page.
1139          * @return array Associating format keys with URLs
1140          */
1141         public function getSyndicationLinks() {
1142                 return $this->mFeedLinks;
1143         }
1144
1145         /**
1146          * Will currently always return null
1147          *
1148          * @return null
1149          */
1150         public function getFeedAppendQuery() {
1151                 return $this->mFeedLinksAppendQuery;
1152         }
1153
1154         /**
1155          * Set whether the displayed content is related to the source of the
1156          * corresponding article on the wiki
1157          * Setting true will cause the change "article related" toggle to true
1158          *
1159          * @param bool $v
1160          */
1161         public function setArticleFlag( $v ) {
1162                 $this->mIsarticle = $v;
1163                 if ( $v ) {
1164                         $this->mIsArticleRelated = $v;
1165                 }
1166         }
1167
1168         /**
1169          * Return whether the content displayed page is related to the source of
1170          * the corresponding article on the wiki
1171          *
1172          * @return bool
1173          */
1174         public function isArticle() {
1175                 return $this->mIsarticle;
1176         }
1177
1178         /**
1179          * Set whether this page is related an article on the wiki
1180          * Setting false will cause the change of "article flag" toggle to false
1181          *
1182          * @param bool $v
1183          */
1184         public function setArticleRelated( $v ) {
1185                 $this->mIsArticleRelated = $v;
1186                 if ( !$v ) {
1187                         $this->mIsarticle = false;
1188                 }
1189         }
1190
1191         /**
1192          * Return whether this page is related an article on the wiki
1193          *
1194          * @return bool
1195          */
1196         public function isArticleRelated() {
1197                 return $this->mIsArticleRelated;
1198         }
1199
1200         /**
1201          * Add new language links
1202          *
1203          * @param array $newLinkArray Associative array mapping language code to the page
1204          *                      name
1205          */
1206         public function addLanguageLinks( array $newLinkArray ) {
1207                 $this->mLanguageLinks += $newLinkArray;
1208         }
1209
1210         /**
1211          * Reset the language links and add new language links
1212          *
1213          * @param array $newLinkArray Associative array mapping language code to the page
1214          *                      name
1215          */
1216         public function setLanguageLinks( array $newLinkArray ) {
1217                 $this->mLanguageLinks = $newLinkArray;
1218         }
1219
1220         /**
1221          * Get the list of language links
1222          *
1223          * @return array Array of Interwiki Prefixed (non DB key) Titles (e.g. 'fr:Test page')
1224          */
1225         public function getLanguageLinks() {
1226                 return $this->mLanguageLinks;
1227         }
1228
1229         /**
1230          * Add an array of categories, with names in the keys
1231          *
1232          * @param array $categories Mapping category name => sort key
1233          */
1234         public function addCategoryLinks( array $categories ) {
1235                 global $wgContLang;
1236
1237                 if ( !is_array( $categories ) || count( $categories ) == 0 ) {
1238                         return;
1239                 }
1240
1241                 # Add the links to a LinkBatch
1242                 $arr = array( NS_CATEGORY => $categories );
1243                 $lb = new LinkBatch;
1244                 $lb->setArray( $arr );
1245
1246                 # Fetch existence plus the hiddencat property
1247                 $dbr = wfGetDB( DB_SLAVE );
1248                 $fields = array( 'page_id', 'page_namespace', 'page_title', 'page_len',
1249                         'page_is_redirect', 'page_latest', 'pp_value' );
1250
1251                 if ( $this->getConfig()->get( 'ContentHandlerUseDB' ) ) {
1252                         $fields[] = 'page_content_model';
1253                 }
1254
1255                 $res = $dbr->select( array( 'page', 'page_props' ),
1256                         $fields,
1257                         $lb->constructSet( 'page', $dbr ),
1258                         __METHOD__,
1259                         array(),
1260                         array( 'page_props' => array( 'LEFT JOIN', array(
1261                                 'pp_propname' => 'hiddencat',
1262                                 'pp_page = page_id'
1263                         ) ) )
1264                 );
1265
1266                 # Add the results to the link cache
1267                 $lb->addResultToCache( LinkCache::singleton(), $res );
1268
1269                 # Set all the values to 'normal'.
1270                 $categories = array_fill_keys( array_keys( $categories ), 'normal' );
1271
1272                 # Mark hidden categories
1273                 foreach ( $res as $row ) {
1274                         if ( isset( $row->pp_value ) ) {
1275                                 $categories[$row->page_title] = 'hidden';
1276                         }
1277                 }
1278
1279                 # Add the remaining categories to the skin
1280                 if ( wfRunHooks(
1281                         'OutputPageMakeCategoryLinks',
1282                         array( &$this, $categories, &$this->mCategoryLinks ) )
1283                 ) {
1284                         foreach ( $categories as $category => $type ) {
1285                                 $origcategory = $category;
1286                                 $title = Title::makeTitleSafe( NS_CATEGORY, $category );
1287                                 if ( !$title ) {
1288                                         continue;
1289                                 }
1290                                 $wgContLang->findVariantLink( $category, $title, true );
1291                                 if ( $category != $origcategory && array_key_exists( $category, $categories ) ) {
1292                                         continue;
1293                                 }
1294                                 $text = $wgContLang->convertHtml( $title->getText() );
1295                                 $this->mCategories[] = $title->getText();
1296                                 $this->mCategoryLinks[$type][] = Linker::link( $title, $text );
1297                         }
1298                 }
1299         }
1300
1301         /**
1302          * Reset the category links (but not the category list) and add $categories
1303          *
1304          * @param array $categories Mapping category name => sort key
1305          */
1306         public function setCategoryLinks( array $categories ) {
1307                 $this->mCategoryLinks = array();
1308                 $this->addCategoryLinks( $categories );
1309         }
1310
1311         /**
1312          * Get the list of category links, in a 2-D array with the following format:
1313          * $arr[$type][] = $link, where $type is either "normal" or "hidden" (for
1314          * hidden categories) and $link a HTML fragment with a link to the category
1315          * page
1316          *
1317          * @return array
1318          */
1319         public function getCategoryLinks() {
1320                 return $this->mCategoryLinks;
1321         }
1322
1323         /**
1324          * Get the list of category names this page belongs to
1325          *
1326          * @return array Array of strings
1327          */
1328         public function getCategories() {
1329                 return $this->mCategories;
1330         }
1331
1332         /**
1333          * Restrict the page to loading modules bundled the software.
1334          *
1335          * Disallows the queue to contain any modules which can be modified by wiki
1336          * users to load on this page.
1337          */
1338         public function disallowUserJs() {
1339                 $this->reduceAllowedModuleOrigin( ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL );
1340         }
1341
1342         /**
1343          * Get the level of JavaScript / CSS untrustworthiness allowed on this page.
1344          *
1345          * @see ResourceLoaderModule::$origin
1346          * @param string $type Unused: Module origin allowance used to be fragmented by
1347          *  ResourceLoaderModule TYPE_ constants.
1348          * @return int ResourceLoaderModule ORIGIN_ class constant
1349          */
1350         public function getAllowedModules( $type = null ) {
1351                 return $this->mAllowedModuleOrigin;
1352         }
1353
1354         /**
1355          * Set the highest level of CSS/JS untrustworthiness allowed
1356          *
1357          * @deprecated since 1.24 Raising level of allowed untrusted content is no longer supported.
1358          *  Use reduceAllowedModuleOrigin() instead.
1359          *
1360          * @param string $type ResourceLoaderModule TYPE_ constant
1361          * @param int $level ResourceLoaderModule ORIGIN_ constant
1362          */
1363         public function setAllowedModules( $type, $level ) {
1364                 wfDeprecated( __METHOD__, '1.24' );
1365                 $this->reduceAllowedModuleOrigin( $level );
1366         }
1367
1368         /**
1369          * Limit the highest level of CSS/JS untrustworthiness allowed.
1370          *
1371          * @deprecated since 1.24 Module allowance is no longer fragmented by content type.
1372          *  Use reduceAllowedModuleOrigin() instead.
1373          *
1374          * @param string $type ResourceLoaderModule TYPE_ constant
1375          * @param int $level ResourceLoaderModule ORIGIN_ class constant
1376          */
1377         public function reduceAllowedModules( $type, $level ) {
1378                 wfDeprecated( __METHOD__, '1.24' );
1379                 $this->reduceAllowedModuleOrigin( $level );
1380         }
1381
1382         /**
1383          * Limit the highest level of CSS/JS untrustworthiness allowed.
1384          *
1385          * If passed the same or a higher level than the current level of untrustworthiness set, the
1386          * level will remain unchanged.
1387          *
1388          * @param int $level ResourceLoaderModule class constant
1389          */
1390         public function reduceAllowedModuleOrigin( $level ) {
1391                 $this->mAllowedModuleOrigin = min( $this->mAllowedModuleOrigin, $level );
1392         }
1393
1394         /**
1395          * Prepend $text to the body HTML
1396          *
1397          * @param string $text HTML
1398          */
1399         public function prependHTML( $text ) {
1400                 $this->mBodytext = $text . $this->mBodytext;
1401         }
1402
1403         /**
1404          * Append $text to the body HTML
1405          *
1406          * @param string $text HTML
1407          */
1408         public function addHTML( $text ) {
1409                 $this->mBodytext .= $text;
1410         }
1411
1412         /**
1413          * Shortcut for adding an Html::element via addHTML.
1414          *
1415          * @since 1.19
1416          *
1417          * @param string $element
1418          * @param array $attribs
1419          * @param string $contents
1420          */
1421         public function addElement( $element, array $attribs = array(), $contents = '' ) {
1422                 $this->addHTML( Html::element( $element, $attribs, $contents ) );
1423         }
1424
1425         /**
1426          * Clear the body HTML
1427          */
1428         public function clearHTML() {
1429                 $this->mBodytext = '';
1430         }
1431
1432         /**
1433          * Get the body HTML
1434          *
1435          * @return string HTML
1436          */
1437         public function getHTML() {
1438                 return $this->mBodytext;
1439         }
1440
1441         /**
1442          * Get/set the ParserOptions object to use for wikitext parsing
1443          *
1444          * @param ParserOptions|null $options Either the ParserOption to use or null to only get the
1445          *   current ParserOption object
1446          * @return ParserOptions
1447          */
1448         public function parserOptions( $options = null ) {
1449                 if ( !$this->mParserOptions ) {
1450                         $this->mParserOptions = ParserOptions::newFromContext( $this->getContext() );
1451                         $this->mParserOptions->setEditSection( false );
1452                 }
1453                 return wfSetVar( $this->mParserOptions, $options );
1454         }
1455
1456         /**
1457          * Set the revision ID which will be seen by the wiki text parser
1458          * for things such as embedded {{REVISIONID}} variable use.
1459          *
1460          * @param int|null $revid An positive integer, or null
1461          * @return mixed Previous value
1462          */
1463         public function setRevisionId( $revid ) {
1464                 $val = is_null( $revid ) ? null : intval( $revid );
1465                 return wfSetVar( $this->mRevisionId, $val );
1466         }
1467
1468         /**
1469          * Get the displayed revision ID
1470          *
1471          * @return int
1472          */
1473         public function getRevisionId() {
1474                 return $this->mRevisionId;
1475         }
1476
1477         /**
1478          * Set the timestamp of the revision which will be displayed. This is used
1479          * to avoid a extra DB call in Skin::lastModified().
1480          *
1481          * @param string|null $timestamp
1482          * @return mixed Previous value
1483          */
1484         public function setRevisionTimestamp( $timestamp ) {
1485                 return wfSetVar( $this->mRevisionTimestamp, $timestamp );
1486         }
1487
1488         /**
1489          * Get the timestamp of displayed revision.
1490          * This will be null if not filled by setRevisionTimestamp().
1491          *
1492          * @return string|null
1493          */
1494         public function getRevisionTimestamp() {
1495                 return $this->mRevisionTimestamp;
1496         }
1497
1498         /**
1499          * Set the displayed file version
1500          *
1501          * @param File|bool $file
1502          * @return mixed Previous value
1503          */
1504         public function setFileVersion( $file ) {
1505                 $val = null;
1506                 if ( $file instanceof File && $file->exists() ) {
1507                         $val = array( 'time' => $file->getTimestamp(), 'sha1' => $file->getSha1() );
1508                 }
1509                 return wfSetVar( $this->mFileVersion, $val, true );
1510         }
1511
1512         /**
1513          * Get the displayed file version
1514          *
1515          * @return array|null ('time' => MW timestamp, 'sha1' => sha1)
1516          */
1517         public function getFileVersion() {
1518                 return $this->mFileVersion;
1519         }
1520
1521         /**
1522          * Get the templates used on this page
1523          *
1524          * @return array (namespace => dbKey => revId)
1525          * @since 1.18
1526          */
1527         public function getTemplateIds() {
1528                 return $this->mTemplateIds;
1529         }
1530
1531         /**
1532          * Get the files used on this page
1533          *
1534          * @return array (dbKey => array('time' => MW timestamp or null, 'sha1' => sha1 or ''))
1535          * @since 1.18
1536          */
1537         public function getFileSearchOptions() {
1538                 return $this->mImageTimeKeys;
1539         }
1540
1541         /**
1542          * Convert wikitext to HTML and add it to the buffer
1543          * Default assumes that the current page title will be used.
1544          *
1545          * @param string $text
1546          * @param bool $linestart Is this the start of a line?
1547          * @param bool $interface Is this text in the user interface language?
1548          */
1549         public function addWikiText( $text, $linestart = true, $interface = true ) {
1550                 $title = $this->getTitle(); // Work around E_STRICT
1551                 if ( !$title ) {
1552                         throw new MWException( 'Title is null' );
1553                 }
1554                 $this->addWikiTextTitle( $text, $title, $linestart, /*tidy*/false, $interface );
1555         }
1556
1557         /**
1558          * Add wikitext with a custom Title object
1559          *
1560          * @param string $text Wikitext
1561          * @param Title $title
1562          * @param bool $linestart Is this the start of a line?
1563          */
1564         public function addWikiTextWithTitle( $text, &$title, $linestart = true ) {
1565                 $this->addWikiTextTitle( $text, $title, $linestart );
1566         }
1567
1568         /**
1569          * Add wikitext with a custom Title object and tidy enabled.
1570          *
1571          * @param string $text Wikitext
1572          * @param Title $title
1573          * @param bool $linestart Is this the start of a line?
1574          */
1575         function addWikiTextTitleTidy( $text, &$title, $linestart = true ) {
1576                 $this->addWikiTextTitle( $text, $title, $linestart, true );
1577         }
1578
1579         /**
1580          * Add wikitext with tidy enabled
1581          *
1582          * @param string $text Wikitext
1583          * @param bool $linestart Is this the start of a line?
1584          */
1585         public function addWikiTextTidy( $text, $linestart = true ) {
1586                 $title = $this->getTitle();
1587                 $this->addWikiTextTitleTidy( $text, $title, $linestart );
1588         }
1589
1590         /**
1591          * Add wikitext with a custom Title object
1592          *
1593          * @param string $text Wikitext
1594          * @param Title $title
1595          * @param bool $linestart Is this the start of a line?
1596          * @param bool $tidy Whether to use tidy
1597          * @param bool $interface Whether it is an interface message
1598          *   (for example disables conversion)
1599          */
1600         public function addWikiTextTitle( $text, Title $title, $linestart,
1601                 $tidy = false, $interface = false
1602         ) {
1603                 global $wgParser;
1604
1605                 wfProfileIn( __METHOD__ );
1606
1607                 $popts = $this->parserOptions();
1608                 $oldTidy = $popts->setTidy( $tidy );
1609                 $popts->setInterfaceMessage( (bool)$interface );
1610
1611                 $parserOutput = $wgParser->getFreshParser()->parse(
1612                         $text, $title, $popts,
1613                         $linestart, true, $this->mRevisionId
1614                 );
1615
1616                 $popts->setTidy( $oldTidy );
1617
1618                 $this->addParserOutput( $parserOutput );
1619
1620                 wfProfileOut( __METHOD__ );
1621         }
1622
1623         /**
1624          * Add a ParserOutput object, but without Html.
1625          *
1626          * @deprecated since 1.24, use addParserOutputMetadata() instead.
1627          * @param ParserOutput $parserOutput
1628          */
1629         public function addParserOutputNoText( $parserOutput ) {
1630                 $this->addParserOutputMetadata( $parserOutput );
1631         }
1632
1633         /**
1634          * Add all metadata associated with a ParserOutput object, but without the actual HTML. This
1635          * includes categories, language links, ResourceLoader modules, effects of certain magic words,
1636          * and so on.
1637          *
1638          * @since 1.24
1639          * @param ParserOutput $parserOutput
1640          */
1641         public function addParserOutputMetadata( $parserOutput ) {
1642                 $this->mLanguageLinks += $parserOutput->getLanguageLinks();
1643                 $this->addCategoryLinks( $parserOutput->getCategories() );
1644                 $this->mNewSectionLink = $parserOutput->getNewSection();
1645                 $this->mHideNewSectionLink = $parserOutput->getHideNewSection();
1646
1647                 $this->mParseWarnings = $parserOutput->getWarnings();
1648                 if ( !$parserOutput->isCacheable() ) {
1649                         $this->enableClientCache( false );
1650                 }
1651                 $this->mNoGallery = $parserOutput->getNoGallery();
1652                 $this->mHeadItems = array_merge( $this->mHeadItems, $parserOutput->getHeadItems() );
1653                 $this->addModules( $parserOutput->getModules() );
1654                 $this->addModuleScripts( $parserOutput->getModuleScripts() );
1655                 $this->addModuleStyles( $parserOutput->getModuleStyles() );
1656                 $this->addModuleMessages( $parserOutput->getModuleMessages() );
1657                 $this->addJsConfigVars( $parserOutput->getJsConfigVars() );
1658                 $this->mPreventClickjacking = $this->mPreventClickjacking
1659                         || $parserOutput->preventClickjacking();
1660
1661                 // Template versioning...
1662                 foreach ( (array)$parserOutput->getTemplateIds() as $ns => $dbks ) {
1663                         if ( isset( $this->mTemplateIds[$ns] ) ) {
1664                                 $this->mTemplateIds[$ns] = $dbks + $this->mTemplateIds[$ns];
1665                         } else {
1666                                 $this->mTemplateIds[$ns] = $dbks;
1667                         }
1668                 }
1669                 // File versioning...
1670                 foreach ( (array)$parserOutput->getFileSearchOptions() as $dbk => $data ) {
1671                         $this->mImageTimeKeys[$dbk] = $data;
1672                 }
1673
1674                 // Hooks registered in the object
1675                 $parserOutputHooks = $this->getConfig()->get( 'ParserOutputHooks' );
1676                 foreach ( $parserOutput->getOutputHooks() as $hookInfo ) {
1677                         list( $hookName, $data ) = $hookInfo;
1678                         if ( isset( $parserOutputHooks[$hookName] ) ) {
1679                                 call_user_func( $parserOutputHooks[$hookName], $this, $parserOutput, $data );
1680                         }
1681                 }
1682
1683                 // Link flags are ignored for now, but may in the future be
1684                 // used to mark individual language links.
1685                 $linkFlags = array();
1686                 wfRunHooks( 'LanguageLinks', array( $this->getTitle(), &$this->mLanguageLinks, &$linkFlags ) );
1687                 wfRunHooks( 'OutputPageParserOutput', array( &$this, $parserOutput ) );
1688         }
1689
1690         /**
1691          * Add the HTML and enhancements for it (like ResourceLoader modules) associated with a
1692          * ParserOutput object, without any other metadata.
1693          *
1694          * @since 1.24
1695          * @param ParserOutput $parserOutput
1696          */
1697         public function addParserOutputContent( $parserOutput ) {
1698                 $this->addParserOutputText( $parserOutput );
1699
1700                 $this->addModules( $parserOutput->getModules() );
1701                 $this->addModuleScripts( $parserOutput->getModuleScripts() );
1702                 $this->addModuleStyles( $parserOutput->getModuleStyles() );
1703                 $this->addModuleMessages( $parserOutput->getModuleMessages() );
1704
1705                 $this->addJsConfigVars( $parserOutput->getJsConfigVars() );
1706         }
1707
1708         /**
1709          * Add the HTML associated with a ParserOutput object, without any metadata.
1710          *
1711          * @since 1.24
1712          * @param ParserOutput $parserOutput
1713          */
1714         public function addParserOutputText( $parserOutput ) {
1715                 $text = $parserOutput->getText();
1716                 wfRunHooks( 'OutputPageBeforeHTML', array( &$this, &$text ) );
1717                 $this->addHTML( $text );
1718         }
1719
1720         /**
1721          * Add everything from a ParserOutput object.
1722          *
1723          * @param ParserOutput $parserOutput
1724          */
1725         function addParserOutput( $parserOutput ) {
1726                 $this->addParserOutputMetadata( $parserOutput );
1727                 $parserOutput->setTOCEnabled( $this->mEnableTOC );
1728
1729                 // Touch section edit links only if not previously disabled
1730                 if ( $parserOutput->getEditSectionTokens() ) {
1731                         $parserOutput->setEditSectionTokens( $this->mEnableSectionEditLinks );
1732                 }
1733
1734                 $this->addParserOutputText( $parserOutput );
1735         }
1736
1737         /**
1738          * Add the output of a QuickTemplate to the output buffer
1739          *
1740          * @param QuickTemplate $template
1741          */
1742         public function addTemplate( &$template ) {
1743                 $this->addHTML( $template->getHTML() );
1744         }
1745
1746         /**
1747          * Parse wikitext and return the HTML.
1748          *
1749          * @param string $text
1750          * @param bool $linestart Is this the start of a line?
1751          * @param bool $interface Use interface language ($wgLang instead of
1752          *   $wgContLang) while parsing language sensitive magic words like GRAMMAR and PLURAL.
1753          *   This also disables LanguageConverter.
1754          * @param Language $language Target language object, will override $interface
1755          * @throws MWException
1756          * @return string HTML
1757          */
1758         public function parse( $text, $linestart = true, $interface = false, $language = null ) {
1759                 global $wgParser;
1760
1761                 if ( is_null( $this->getTitle() ) ) {
1762                         throw new MWException( 'Empty $mTitle in ' . __METHOD__ );
1763                 }
1764
1765                 $popts = $this->parserOptions();
1766                 if ( $interface ) {
1767                         $popts->setInterfaceMessage( true );
1768                 }
1769                 if ( $language !== null ) {
1770                         $oldLang = $popts->setTargetLanguage( $language );
1771                 }
1772
1773                 $parserOutput = $wgParser->getFreshParser()->parse(
1774                         $text, $this->getTitle(), $popts,
1775                         $linestart, true, $this->mRevisionId
1776                 );
1777
1778                 if ( $interface ) {
1779                         $popts->setInterfaceMessage( false );
1780                 }
1781                 if ( $language !== null ) {
1782                         $popts->setTargetLanguage( $oldLang );
1783                 }
1784
1785                 return $parserOutput->getText();
1786         }
1787
1788         /**
1789          * Parse wikitext, strip paragraphs, and return the HTML.
1790          *
1791          * @param string $text
1792          * @param bool $linestart Is this the start of a line?
1793          * @param bool $interface Use interface language ($wgLang instead of
1794          *   $wgContLang) while parsing language sensitive magic
1795          *   words like GRAMMAR and PLURAL
1796          * @return string HTML
1797          */
1798         public function parseInline( $text, $linestart = true, $interface = false ) {
1799                 $parsed = $this->parse( $text, $linestart, $interface );
1800                 return Parser::stripOuterParagraph( $parsed );
1801         }
1802
1803         /**
1804          * Set the value of the "s-maxage" part of the "Cache-control" HTTP header
1805          *
1806          * @param int $maxage Maximum cache time on the Squid, in seconds.
1807          */
1808         public function setSquidMaxage( $maxage ) {
1809                 $this->mSquidMaxage = $maxage;
1810         }
1811
1812         /**
1813          * Use enableClientCache(false) to force it to send nocache headers
1814          *
1815          * @param bool $state
1816          *
1817          * @return bool
1818          */
1819         public function enableClientCache( $state ) {
1820                 return wfSetVar( $this->mEnableClientCache, $state );
1821         }
1822
1823         /**
1824          * Get the list of cookies that will influence on the cache
1825          *
1826          * @return array
1827          */
1828         function getCacheVaryCookies() {
1829                 static $cookies;
1830                 if ( $cookies === null ) {
1831                         $config = $this->getConfig();
1832                         $cookies = array_merge(
1833                                 array(
1834                                         $config->get( 'CookiePrefix' ) . 'Token',
1835                                         $config->get( 'CookiePrefix' ) . 'LoggedOut',
1836                                         "forceHTTPS",
1837                                         session_name()
1838                                 ),
1839                                 $config->get( 'CacheVaryCookies' )
1840                         );
1841                         wfRunHooks( 'GetCacheVaryCookies', array( $this, &$cookies ) );
1842                 }
1843                 return $cookies;
1844         }
1845
1846         /**
1847          * Check if the request has a cache-varying cookie header
1848          * If it does, it's very important that we don't allow public caching
1849          *
1850          * @return bool
1851          */
1852         function haveCacheVaryCookies() {
1853                 $cookieHeader = $this->getRequest()->getHeader( 'cookie' );
1854                 if ( $cookieHeader === false ) {
1855                         return false;
1856                 }
1857                 $cvCookies = $this->getCacheVaryCookies();
1858                 foreach ( $cvCookies as $cookieName ) {
1859                         # Check for a simple string match, like the way squid does it
1860                         if ( strpos( $cookieHeader, $cookieName ) !== false ) {
1861                                 wfDebug( __METHOD__ . ": found $cookieName\n" );
1862                                 return true;
1863                         }
1864                 }
1865                 wfDebug( __METHOD__ . ": no cache-varying cookies found\n" );
1866                 return false;
1867         }
1868
1869         /**
1870          * Add an HTTP header that will influence on the cache
1871          *
1872          * @param string $header Header name
1873          * @param array|null $option
1874          * @todo FIXME: Document the $option parameter; it appears to be for
1875          *        X-Vary-Options but what format is acceptable?
1876          */
1877         public function addVaryHeader( $header, $option = null ) {
1878                 if ( !array_key_exists( $header, $this->mVaryHeader ) ) {
1879                         $this->mVaryHeader[$header] = (array)$option;
1880                 } elseif ( is_array( $option ) ) {
1881                         if ( is_array( $this->mVaryHeader[$header] ) ) {
1882                                 $this->mVaryHeader[$header] = array_merge( $this->mVaryHeader[$header], $option );
1883                         } else {
1884                                 $this->mVaryHeader[$header] = $option;
1885                         }
1886                 }
1887                 $this->mVaryHeader[$header] = array_unique( (array)$this->mVaryHeader[$header] );
1888         }
1889
1890         /**
1891          * Return a Vary: header on which to vary caches. Based on the keys of $mVaryHeader,
1892          * such as Accept-Encoding or Cookie
1893          *
1894          * @return string
1895          */
1896         public function getVaryHeader() {
1897                 return 'Vary: ' . join( ', ', array_keys( $this->mVaryHeader ) );
1898         }
1899
1900         /**
1901          * Get a complete X-Vary-Options header
1902          *
1903          * @return string
1904          */
1905         public function getXVO() {
1906                 $cvCookies = $this->getCacheVaryCookies();
1907
1908                 $cookiesOption = array();
1909                 foreach ( $cvCookies as $cookieName ) {
1910                         $cookiesOption[] = 'string-contains=' . $cookieName;
1911                 }
1912                 $this->addVaryHeader( 'Cookie', $cookiesOption );
1913
1914                 $headers = array();
1915                 foreach ( $this->mVaryHeader as $header => $option ) {
1916                         $newheader = $header;
1917                         if ( is_array( $option ) && count( $option ) > 0 ) {
1918                                 $newheader .= ';' . implode( ';', $option );
1919                         }
1920                         $headers[] = $newheader;
1921                 }
1922                 $xvo = 'X-Vary-Options: ' . implode( ',', $headers );
1923
1924                 return $xvo;
1925         }
1926
1927         /**
1928          * bug 21672: Add Accept-Language to Vary and XVO headers
1929          * if there's no 'variant' parameter existed in GET.
1930          *
1931          * For example:
1932          *   /w/index.php?title=Main_page should always be served; but
1933          *   /w/index.php?title=Main_page&variant=zh-cn should never be served.
1934          */
1935         function addAcceptLanguage() {
1936                 $title = $this->getTitle();
1937                 if ( !$title instanceof Title ) {
1938                         return;
1939                 }
1940
1941                 $lang = $title->getPageLanguage();
1942                 if ( !$this->getRequest()->getCheck( 'variant' ) && $lang->hasVariants() ) {
1943                         $variants = $lang->getVariants();
1944                         $aloption = array();
1945                         foreach ( $variants as $variant ) {
1946                                 if ( $variant === $lang->getCode() ) {
1947                                         continue;
1948                                 } else {
1949                                         $aloption[] = 'string-contains=' . $variant;
1950
1951                                         // IE and some other browsers use BCP 47 standards in
1952                                         // their Accept-Language header, like "zh-CN" or "zh-Hant".
1953                                         // We should handle these too.
1954                                         $variantBCP47 = wfBCP47( $variant );
1955                                         if ( $variantBCP47 !== $variant ) {
1956                                                 $aloption[] = 'string-contains=' . $variantBCP47;
1957                                         }
1958                                 }
1959                         }
1960                         $this->addVaryHeader( 'Accept-Language', $aloption );
1961                 }
1962         }
1963
1964         /**
1965          * Set a flag which will cause an X-Frame-Options header appropriate for
1966          * edit pages to be sent. The header value is controlled by
1967          * $wgEditPageFrameOptions.
1968          *
1969          * This is the default for special pages. If you display a CSRF-protected
1970          * form on an ordinary view page, then you need to call this function.
1971          *
1972          * @param bool $enable
1973          */
1974         public function preventClickjacking( $enable = true ) {
1975                 $this->mPreventClickjacking = $enable;
1976         }
1977
1978         /**
1979          * Turn off frame-breaking. Alias for $this->preventClickjacking(false).
1980          * This can be called from pages which do not contain any CSRF-protected
1981          * HTML form.
1982          */
1983         public function allowClickjacking() {
1984                 $this->mPreventClickjacking = false;
1985         }
1986
1987         /**
1988          * Get the prevent-clickjacking flag
1989          *
1990          * @since 1.24
1991          * @return bool
1992          */
1993         public function getPreventClickjacking() {
1994                 return $this->mPreventClickjacking;
1995         }
1996
1997         /**
1998          * Get the X-Frame-Options header value (without the name part), or false
1999          * if there isn't one. This is used by Skin to determine whether to enable
2000          * JavaScript frame-breaking, for clients that don't support X-Frame-Options.
2001          *
2002          * @return string
2003          */
2004         public function getFrameOptions() {
2005                 $config = $this->getConfig();
2006                 if ( $config->get( 'BreakFrames' ) ) {
2007                         return 'DENY';
2008                 } elseif ( $this->mPreventClickjacking && $config->get( 'EditPageFrameOptions' ) ) {
2009                         return $config->get( 'EditPageFrameOptions' );
2010                 }
2011                 return false;
2012         }
2013
2014         /**
2015          * Send cache control HTTP headers
2016          */
2017         public function sendCacheControl() {
2018                 $response = $this->getRequest()->response();
2019                 $config = $this->getConfig();
2020                 if ( $config->get( 'UseETag' ) && $this->mETag ) {
2021                         $response->header( "ETag: $this->mETag" );
2022                 }
2023
2024                 $this->addVaryHeader( 'Cookie' );
2025                 $this->addAcceptLanguage();
2026
2027                 # don't serve compressed data to clients who can't handle it
2028                 # maintain different caches for logged-in users and non-logged in ones
2029                 $response->header( $this->getVaryHeader() );
2030
2031                 if ( $config->get( 'UseXVO' ) ) {
2032                         # Add an X-Vary-Options header for Squid with Wikimedia patches
2033                         $response->header( $this->getXVO() );
2034                 }
2035
2036                 if ( $this->mEnableClientCache ) {
2037                         if (
2038                                 $config->get( 'UseSquid' ) && session_id() == '' && !$this->isPrintable() &&
2039                                 $this->mSquidMaxage != 0 && !$this->haveCacheVaryCookies()
2040                         ) {
2041                                 if ( $config->get( 'UseESI' ) ) {
2042                                         # We'll purge the proxy cache explicitly, but require end user agents
2043                                         # to revalidate against the proxy on each visit.
2044                                         # Surrogate-Control controls our Squid, Cache-Control downstream caches
2045                                         wfDebug( __METHOD__ . ": proxy caching with ESI; {$this->mLastModified} **\n", 'log' );
2046                                         # start with a shorter timeout for initial testing
2047                                         # header( 'Surrogate-Control: max-age=2678400+2678400, content="ESI/1.0"');
2048                                         $response->header( 'Surrogate-Control: max-age=' . $config->get( 'SquidMaxage' )
2049                                                 . '+' . $this->mSquidMaxage . ', content="ESI/1.0"' );
2050                                         $response->header( 'Cache-Control: s-maxage=0, must-revalidate, max-age=0' );
2051                                 } else {
2052                                         # We'll purge the proxy cache for anons explicitly, but require end user agents
2053                                         # to revalidate against the proxy on each visit.
2054                                         # IMPORTANT! The Squid needs to replace the Cache-Control header with
2055                                         # Cache-Control: s-maxage=0, must-revalidate, max-age=0
2056                                         wfDebug( __METHOD__ . ": local proxy caching; {$this->mLastModified} **\n", 'log' );
2057                                         # start with a shorter timeout for initial testing
2058                                         # header( "Cache-Control: s-maxage=2678400, must-revalidate, max-age=0" );
2059                                         $response->header( 'Cache-Control: s-maxage=' . $this->mSquidMaxage
2060                                                 . ', must-revalidate, max-age=0' );
2061                                 }
2062                         } else {
2063                                 # We do want clients to cache if they can, but they *must* check for updates
2064                                 # on revisiting the page.
2065                                 wfDebug( __METHOD__ . ": private caching; {$this->mLastModified} **\n", 'log' );
2066                                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
2067                                 $response->header( "Cache-Control: private, must-revalidate, max-age=0" );
2068                         }
2069                         if ( $this->mLastModified ) {
2070                                 $response->header( "Last-Modified: {$this->mLastModified}" );
2071                         }
2072                 } else {
2073                         wfDebug( __METHOD__ . ": no caching **\n", 'log' );
2074
2075                         # In general, the absence of a last modified header should be enough to prevent
2076                         # the client from using its cache. We send a few other things just to make sure.
2077                         $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
2078                         $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
2079                         $response->header( 'Pragma: no-cache' );
2080                 }
2081         }
2082
2083         /**
2084          * Finally, all the text has been munged and accumulated into
2085          * the object, let's actually output it:
2086          */
2087         public function output() {
2088                 global $wgLanguageCode;
2089
2090                 if ( $this->mDoNothing ) {
2091                         return;
2092                 }
2093
2094                 wfProfileIn( __METHOD__ );
2095
2096                 $response = $this->getRequest()->response();
2097                 $config = $this->getConfig();
2098
2099                 if ( $this->mRedirect != '' ) {
2100                         # Standards require redirect URLs to be absolute
2101                         $this->mRedirect = wfExpandUrl( $this->mRedirect, PROTO_CURRENT );
2102
2103                         $redirect = $this->mRedirect;
2104                         $code = $this->mRedirectCode;
2105
2106                         if ( wfRunHooks( "BeforePageRedirect", array( $this, &$redirect, &$code ) ) ) {
2107                                 if ( $code == '301' || $code == '303' ) {
2108                                         if ( !$config->get( 'DebugRedirects' ) ) {
2109                                                 $message = HttpStatus::getMessage( $code );
2110                                                 $response->header( "HTTP/1.1 $code $message" );
2111                                         }
2112                                         $this->mLastModified = wfTimestamp( TS_RFC2822 );
2113                                 }
2114                                 if ( $config->get( 'VaryOnXFP' ) ) {
2115                                         $this->addVaryHeader( 'X-Forwarded-Proto' );
2116                                 }
2117                                 $this->sendCacheControl();
2118
2119                                 $response->header( "Content-Type: text/html; charset=utf-8" );
2120                                 if ( $config->get( 'DebugRedirects' ) ) {
2121                                         $url = htmlspecialchars( $redirect );
2122                                         print "<html>\n<head>\n<title>Redirect</title>\n</head>\n<body>\n";
2123                                         print "<p>Location: <a href=\"$url\">$url</a></p>\n";
2124                                         print "</body>\n</html>\n";
2125                                 } else {
2126                                         $response->header( 'Location: ' . $redirect );
2127                                 }
2128                         }
2129
2130                         wfProfileOut( __METHOD__ );
2131                         return;
2132                 } elseif ( $this->mStatusCode ) {
2133                         $message = HttpStatus::getMessage( $this->mStatusCode );
2134                         if ( $message ) {
2135                                 $response->header( 'HTTP/1.1 ' . $this->mStatusCode . ' ' . $message );
2136                         }
2137                 }
2138
2139                 # Buffer output; final headers may depend on later processing
2140                 ob_start();
2141
2142                 $response->header( 'Content-type: ' . $config->get( 'MimeType' ) . '; charset=UTF-8' );
2143                 $response->header( 'Content-language: ' . $wgLanguageCode );
2144
2145                 // Avoid Internet Explorer "compatibility view" in IE 8-10, so that
2146                 // jQuery etc. can work correctly.
2147                 $response->header( 'X-UA-Compatible: IE=Edge' );
2148
2149                 // Prevent framing, if requested
2150                 $frameOptions = $this->getFrameOptions();
2151                 if ( $frameOptions ) {
2152                         $response->header( "X-Frame-Options: $frameOptions" );
2153                 }
2154
2155                 if ( $this->mArticleBodyOnly ) {
2156                         echo $this->mBodytext;
2157                 } else {
2158
2159                         $sk = $this->getSkin();
2160                         // add skin specific modules
2161                         $modules = $sk->getDefaultModules();
2162
2163                         // enforce various default modules for all skins
2164                         $coreModules = array(
2165                                 // keep this list as small as possible
2166                                 'mediawiki.page.startup',
2167                                 'mediawiki.user',
2168                         );
2169
2170                         // Support for high-density display images if enabled
2171                         if ( $config->get( 'ResponsiveImages' ) ) {
2172                                 $coreModules[] = 'mediawiki.hidpi';
2173                         }
2174
2175                         $this->addModules( $coreModules );
2176                         foreach ( $modules as $group ) {
2177                                 $this->addModules( $group );
2178                         }
2179                         MWDebug::addModules( $this );
2180
2181                         // Hook that allows last minute changes to the output page, e.g.
2182                         // adding of CSS or Javascript by extensions.
2183                         wfRunHooks( 'BeforePageDisplay', array( &$this, &$sk ) );
2184
2185                         wfProfileIn( 'Output-skin' );
2186                         $sk->outputPage();
2187                         wfProfileOut( 'Output-skin' );
2188                 }
2189
2190                 // This hook allows last minute changes to final overall output by modifying output buffer
2191                 wfRunHooks( 'AfterFinalPageOutput', array( $this ) );
2192
2193                 $this->sendCacheControl();
2194
2195                 ob_end_flush();
2196
2197                 wfProfileOut( __METHOD__ );
2198         }
2199
2200         /**
2201          * Actually output something with print.
2202          *
2203          * @param string $ins The string to output
2204          * @deprecated since 1.22 Use echo yourself.
2205          */
2206         public function out( $ins ) {
2207                 wfDeprecated( __METHOD__, '1.22' );
2208                 print $ins;
2209         }
2210
2211         /**
2212          * Produce a "user is blocked" page.
2213          * @deprecated since 1.18
2214          */
2215         function blockedPage() {
2216                 throw new UserBlockedError( $this->getUser()->mBlock );
2217         }
2218
2219         /**
2220          * Prepare this object to display an error page; disable caching and
2221          * indexing, clear the current text and redirect, set the page's title
2222          * and optionally an custom HTML title (content of the "<title>" tag).
2223          *
2224          * @param string|Message $pageTitle Will be passed directly to setPageTitle()
2225          * @param string|Message $htmlTitle Will be passed directly to setHTMLTitle();
2226          *                   optional, if not passed the "<title>" attribute will be
2227          *                   based on $pageTitle
2228          */
2229         public function prepareErrorPage( $pageTitle, $htmlTitle = false ) {
2230                 $this->setPageTitle( $pageTitle );
2231                 if ( $htmlTitle !== false ) {
2232                         $this->setHTMLTitle( $htmlTitle );
2233                 }
2234                 $this->setRobotPolicy( 'noindex,nofollow' );
2235                 $this->setArticleRelated( false );
2236                 $this->enableClientCache( false );
2237                 $this->mRedirect = '';
2238                 $this->clearSubtitle();
2239                 $this->clearHTML();
2240         }
2241
2242         /**
2243          * Output a standard error page
2244          *
2245          * showErrorPage( 'titlemsg', 'pagetextmsg' );
2246          * showErrorPage( 'titlemsg', 'pagetextmsg', array( 'param1', 'param2' ) );
2247          * showErrorPage( 'titlemsg', $messageObject );
2248          * showErrorPage( $titleMessageObject, $messageObject );
2249          *
2250          * @param string|Message $title Message key (string) for page title, or a Message object
2251          * @param string|Message $msg Message key (string) for page text, or a Message object
2252          * @param array $params Message parameters; ignored if $msg is a Message object
2253          */
2254         public function showErrorPage( $title, $msg, $params = array() ) {
2255                 if ( !$title instanceof Message ) {
2256                         $title = $this->msg( $title );
2257                 }
2258
2259                 $this->prepareErrorPage( $title );
2260
2261                 if ( $msg instanceof Message ) {
2262                         if ( $params !== array() ) {
2263                                 trigger_error( 'Argument ignored: $params. The message parameters argument '
2264                                         . 'is discarded when the $msg argument is a Message object instead of '
2265                                         . 'a string.', E_USER_NOTICE );
2266                         }
2267                         $this->addHTML( $msg->parseAsBlock() );
2268                 } else {
2269                         $this->addWikiMsgArray( $msg, $params );
2270                 }
2271
2272                 $this->returnToMain();
2273         }
2274
2275         /**
2276          * Output a standard permission error page
2277          *
2278          * @param array $errors Error message keys
2279          * @param string $action Action that was denied or null if unknown
2280          */
2281         public function showPermissionsErrorPage( array $errors, $action = null ) {
2282                 // For some action (read, edit, create and upload), display a "login to do this action"
2283                 // error if all of the following conditions are met:
2284                 // 1. the user is not logged in
2285                 // 2. the only error is insufficient permissions (i.e. no block or something else)
2286                 // 3. the error can be avoided simply by logging in
2287                 if ( in_array( $action, array( 'read', 'edit', 'createpage', 'createtalk', 'upload' ) )
2288                         && $this->getUser()->isAnon() && count( $errors ) == 1 && isset( $errors[0][0] )
2289                         && ( $errors[0][0] == 'badaccess-groups' || $errors[0][0] == 'badaccess-group0' )
2290                         && ( User::groupHasPermission( 'user', $action )
2291                         || User::groupHasPermission( 'autoconfirmed', $action ) )
2292                 ) {
2293                         $displayReturnto = null;
2294
2295                         # Due to bug 32276, if a user does not have read permissions,
2296                         # $this->getTitle() will just give Special:Badtitle, which is
2297                         # not especially useful as a returnto parameter. Use the title
2298                         # from the request instead, if there was one.
2299                         $request = $this->getRequest();
2300                         $returnto = Title::newFromURL( $request->getVal( 'title', '' ) );
2301                         if ( $action == 'edit' ) {
2302                                 $msg = 'whitelistedittext';
2303                                 $displayReturnto = $returnto;
2304                         } elseif ( $action == 'createpage' || $action == 'createtalk' ) {
2305                                 $msg = 'nocreatetext';
2306                         } elseif ( $action == 'upload' ) {
2307                                 $msg = 'uploadnologintext';
2308                         } else { # Read
2309                                 $msg = 'loginreqpagetext';
2310                                 $displayReturnto = Title::newMainPage();
2311                         }
2312
2313                         $query = array();
2314
2315                         if ( $returnto ) {
2316                                 $query['returnto'] = $returnto->getPrefixedText();
2317
2318                                 if ( !$request->wasPosted() ) {
2319                                         $returntoquery = $request->getValues();
2320                                         unset( $returntoquery['title'] );
2321                                         unset( $returntoquery['returnto'] );
2322                                         unset( $returntoquery['returntoquery'] );
2323                                         $query['returntoquery'] = wfArrayToCgi( $returntoquery );
2324                                 }
2325                         }
2326                         $loginLink = Linker::linkKnown(
2327                                 SpecialPage::getTitleFor( 'Userlogin' ),
2328                                 $this->msg( 'loginreqlink' )->escaped(),
2329                                 array(),
2330                                 $query
2331                         );
2332
2333                         $this->prepareErrorPage( $this->msg( 'loginreqtitle' ) );
2334                         $this->addHTML( $this->msg( $msg )->rawParams( $loginLink )->parse() );
2335
2336                         # Don't return to a page the user can't read otherwise
2337                         # we'll end up in a pointless loop
2338                         if ( $displayReturnto && $displayReturnto->userCan( 'read', $this->getUser() ) ) {
2339                                 $this->returnToMain( null, $displayReturnto );
2340                         }
2341                 } else {
2342                         $this->prepareErrorPage( $this->msg( 'permissionserrors' ) );
2343                         $this->addWikiText( $this->formatPermissionsErrorMessage( $errors, $action ) );
2344                 }
2345         }
2346
2347         /**
2348          * Display an error page indicating that a given version of MediaWiki is
2349          * required to use it
2350          *
2351          * @param mixed $version The version of MediaWiki needed to use the page
2352          */
2353         public function versionRequired( $version ) {
2354                 $this->prepareErrorPage( $this->msg( 'versionrequired', $version ) );
2355
2356                 $this->addWikiMsg( 'versionrequiredtext', $version );
2357                 $this->returnToMain();
2358         }
2359
2360         /**
2361          * Display an error page noting that a given permission bit is required.
2362          * @deprecated since 1.18, just throw the exception directly
2363          * @param string $permission Key required
2364          * @throws PermissionsError
2365          */
2366         public function permissionRequired( $permission ) {
2367                 throw new PermissionsError( $permission );
2368         }
2369
2370         /**
2371          * Produce the stock "please login to use the wiki" page
2372          *
2373          * @deprecated since 1.19; throw the exception directly
2374          */
2375         public function loginToUse() {
2376                 throw new PermissionsError( 'read' );
2377         }
2378
2379         /**
2380          * Format a list of error messages
2381          *
2382          * @param array $errors Array of arrays returned by Title::getUserPermissionsErrors
2383          * @param string $action Action that was denied or null if unknown
2384          * @return string The wikitext error-messages, formatted into a list.
2385          */
2386         public function formatPermissionsErrorMessage( array $errors, $action = null ) {
2387                 if ( $action == null ) {
2388                         $text = $this->msg( 'permissionserrorstext', count( $errors ) )->plain() . "\n\n";
2389                 } else {
2390                         $action_desc = $this->msg( "action-$action" )->plain();
2391                         $text = $this->msg(
2392                                 'permissionserrorstext-withaction',
2393                                 count( $errors ),
2394                                 $action_desc
2395                         )->plain() . "\n\n";
2396                 }
2397
2398                 if ( count( $errors ) > 1 ) {
2399                         $text .= '<ul class="permissions-errors">' . "\n";
2400
2401                         foreach ( $errors as $error ) {
2402                                 $text .= '<li>';
2403                                 $text .= call_user_func_array( array( $this, 'msg' ), $error )->plain();
2404                                 $text .= "</li>\n";
2405                         }
2406                         $text .= '</ul>';
2407                 } else {
2408                         $text .= "<div class=\"permissions-errors\">\n" .
2409                                         call_user_func_array( array( $this, 'msg' ), reset( $errors ) )->plain() .
2410                                         "\n</div>";
2411                 }
2412
2413                 return $text;
2414         }
2415
2416         /**
2417          * Display a page stating that the Wiki is in read-only mode.
2418          * Should only be called after wfReadOnly() has returned true.
2419          *
2420          * Historically, this function was used to show the source of the page that the user
2421          * was trying to edit and _also_ permissions error messages. The relevant code was
2422          * moved into EditPage in 1.19 (r102024 / d83c2a431c2a) and removed here in 1.25.
2423          *
2424          * @deprecated since 1.25; throw the exception directly
2425          * @throws ReadOnlyError
2426          */
2427         public function readOnlyPage() {
2428                 if ( func_num_args() > 0 ) {
2429                         throw new MWException( __METHOD__ . ' no longer accepts arguments since 1.25.' );
2430                 }
2431
2432                 throw new ReadOnlyError;
2433         }
2434
2435         /**
2436          * Turn off regular page output and return an error response
2437          * for when rate limiting has triggered.
2438          *
2439          * @deprecated since 1.25; throw the exception directly
2440          */
2441         public function rateLimited() {
2442                 wfDeprecated( __METHOD__, '1.25' );
2443                 throw new ThrottledError;
2444         }
2445
2446         /**
2447          * Show a warning about slave lag
2448          *
2449          * If the lag is higher than $wgSlaveLagCritical seconds,
2450          * then the warning is a bit more obvious. If the lag is
2451          * lower than $wgSlaveLagWarning, then no warning is shown.
2452          *
2453          * @param int $lag Slave lag
2454          */
2455         public function showLagWarning( $lag ) {
2456                 $config = $this->getConfig();
2457                 if ( $lag >= $config->get( 'SlaveLagWarning' ) ) {
2458                         $message = $lag < $config->get( 'SlaveLagCritical' )
2459                                 ? 'lag-warn-normal'
2460                                 : 'lag-warn-high';
2461                         $wrap = Html::rawElement( 'div', array( 'class' => "mw-{$message}" ), "\n$1\n" );
2462                         $this->wrapWikiMsg( "$wrap\n", array( $message, $this->getLanguage()->formatNum( $lag ) ) );
2463                 }
2464         }
2465
2466         public function showFatalError( $message ) {
2467                 $this->prepareErrorPage( $this->msg( 'internalerror' ) );
2468
2469                 $this->addHTML( $message );
2470         }
2471
2472         public function showUnexpectedValueError( $name, $val ) {
2473                 $this->showFatalError( $this->msg( 'unexpected', $name, $val )->text() );
2474         }
2475
2476         public function showFileCopyError( $old, $new ) {
2477                 $this->showFatalError( $this->msg( 'filecopyerror', $old, $new )->text() );
2478         }
2479
2480         public function showFileRenameError( $old, $new ) {
2481                 $this->showFatalError( $this->msg( 'filerenameerror', $old, $new )->text() );
2482         }
2483
2484         public function showFileDeleteError( $name ) {
2485                 $this->showFatalError( $this->msg( 'filedeleteerror', $name )->text() );
2486         }
2487
2488         public function showFileNotFoundError( $name ) {
2489                 $this->showFatalError( $this->msg( 'filenotfound', $name )->text() );
2490         }
2491
2492         /**
2493          * Add a "return to" link pointing to a specified title
2494          *
2495          * @param Title $title Title to link
2496          * @param array $query Query string parameters
2497          * @param string $text Text of the link (input is not escaped)
2498          * @param array $options Options array to pass to Linker
2499          */
2500         public function addReturnTo( $title, array $query = array(), $text = null, $options = array() ) {
2501                 $link = $this->msg( 'returnto' )->rawParams(
2502                         Linker::link( $title, $text, array(), $query, $options ) )->escaped();
2503                 $this->addHTML( "<p id=\"mw-returnto\">{$link}</p>\n" );
2504         }
2505
2506         /**
2507          * Add a "return to" link pointing to a specified title,
2508          * or the title indicated in the request, or else the main page
2509          *
2510          * @param mixed $unused
2511          * @param Title|string $returnto Title or String to return to
2512          * @param string $returntoquery Query string for the return to link
2513          */
2514         public function returnToMain( $unused = null, $returnto = null, $returntoquery = null ) {
2515                 if ( $returnto == null ) {
2516                         $returnto = $this->getRequest()->getText( 'returnto' );
2517                 }
2518
2519                 if ( $returntoquery == null ) {
2520                         $returntoquery = $this->getRequest()->getText( 'returntoquery' );
2521                 }
2522
2523                 if ( $returnto === '' ) {
2524                         $returnto = Title::newMainPage();
2525                 }
2526
2527                 if ( is_object( $returnto ) ) {
2528                         $titleObj = $returnto;
2529                 } else {
2530                         $titleObj = Title::newFromText( $returnto );
2531                 }
2532                 if ( !is_object( $titleObj ) ) {
2533                         $titleObj = Title::newMainPage();
2534                 }
2535
2536                 $this->addReturnTo( $titleObj, wfCgiToArray( $returntoquery ) );
2537         }
2538
2539         /**
2540          * @param Skin $sk The given Skin
2541          * @param bool $includeStyle Unused
2542          * @return string The doctype, opening "<html>", and head element.
2543          */
2544         public function headElement( Skin $sk, $includeStyle = true ) {
2545                 global $wgContLang;
2546
2547                 $section = new ProfileSection( __METHOD__ );
2548
2549                 $userdir = $this->getLanguage()->getDir();
2550                 $sitedir = $wgContLang->getDir();
2551
2552                 $ret = Html::htmlHeader( $sk->getHtmlElementAttributes() );
2553
2554                 if ( $this->getHTMLTitle() == '' ) {
2555                         $this->setHTMLTitle( $this->msg( 'pagetitle', $this->getPageTitle() )->inContentLanguage() );
2556                 }
2557
2558                 $openHead = Html::openElement( 'head' );
2559                 if ( $openHead ) {
2560                         # Don't bother with the newline if $head == ''
2561                         $ret .= "$openHead\n";
2562                 }
2563
2564                 if ( !Html::isXmlMimeType( $this->getConfig()->get( 'MimeType' ) ) ) {
2565                         // Add <meta charset="UTF-8">
2566                         // This should be before <title> since it defines the charset used by
2567                         // text including the text inside <title>.
2568                         // The spec recommends defining XHTML5's charset using the XML declaration
2569                         // instead of meta.
2570                         // Our XML declaration is output by Html::htmlHeader.
2571                         // http://www.whatwg.org/html/semantics.html#attr-meta-http-equiv-content-type
2572                         // http://www.whatwg.org/html/semantics.html#charset
2573                         $ret .= Html::element( 'meta', array( 'charset' => 'UTF-8' ) ) . "\n";
2574                 }
2575
2576                 $ret .= Html::element( 'title', null, $this->getHTMLTitle() ) . "\n";
2577
2578                 foreach ( $this->getHeadLinksArray() as $item ) {
2579                         $ret .= $item . "\n";
2580                 }
2581
2582                 // No newline after buildCssLinks since makeResourceLoaderLink did that already
2583                 $ret .= $this->buildCssLinks();
2584
2585                 $ret .= $this->getHeadScripts() . "\n";
2586
2587                 foreach ( $this->mHeadItems as $item ) {
2588                         $ret .= $item . "\n";
2589                 }
2590
2591                 $closeHead = Html::closeElement( 'head' );
2592                 if ( $closeHead ) {
2593                         $ret .= "$closeHead\n";
2594                 }
2595
2596                 $bodyClasses = array();
2597                 $bodyClasses[] = 'mediawiki';
2598
2599                 # Classes for LTR/RTL directionality support
2600                 $bodyClasses[] = $userdir;
2601                 $bodyClasses[] = "sitedir-$sitedir";
2602
2603                 if ( $this->getLanguage()->capitalizeAllNouns() ) {
2604                         # A <body> class is probably not the best way to do this . . .
2605                         $bodyClasses[] = 'capitalize-all-nouns';
2606                 }
2607
2608                 $bodyClasses[] = $sk->getPageClasses( $this->getTitle() );
2609                 $bodyClasses[] = 'skin-' . Sanitizer::escapeClass( $sk->getSkinName() );
2610                 $bodyClasses[] =
2611                         'action-' . Sanitizer::escapeClass( Action::getActionName( $this->getContext() ) );
2612
2613                 $bodyAttrs = array();
2614                 // While the implode() is not strictly needed, it's used for backwards compatibility
2615                 // (this used to be built as a string and hooks likely still expect that).
2616                 $bodyAttrs['class'] = implode( ' ', $bodyClasses );
2617
2618                 // Allow skins and extensions to add body attributes they need
2619                 $sk->addToBodyAttributes( $this, $bodyAttrs );
2620                 wfRunHooks( 'OutputPageBodyAttributes', array( $this, $sk, &$bodyAttrs ) );
2621
2622                 $ret .= Html::openElement( 'body', $bodyAttrs ) . "\n";
2623
2624                 return $ret;
2625         }
2626
2627         /**
2628          * Get a ResourceLoader object associated with this OutputPage
2629          *
2630          * @return ResourceLoader
2631          */
2632         public function getResourceLoader() {
2633                 if ( is_null( $this->mResourceLoader ) ) {
2634                         $this->mResourceLoader = new ResourceLoader( $this->getConfig() );
2635                 }
2636                 return $this->mResourceLoader;
2637         }
2638
2639         /**
2640          * @todo Document
2641          * @param array|string $modules One or more module names
2642          * @param string $only ResourceLoaderModule TYPE_ class constant
2643          * @param bool $useESI
2644          * @param array $extraQuery Array with extra query parameters to add to each
2645          *   request. array( param => value ).
2646          * @param bool $loadCall If true, output an (asynchronous) mw.loader.load()
2647          *   call rather than a "<script src='...'>" tag.
2648          * @return string The html "<script>", "<link>" and "<style>" tags
2649          */
2650         protected function makeResourceLoaderLink( $modules, $only, $useESI = false,
2651                 array $extraQuery = array(), $loadCall = false
2652         ) {
2653                 $modules = (array)$modules;
2654
2655                 $links = array(
2656                         'html' => '',
2657                         'states' => array(),
2658                 );
2659
2660                 if ( !count( $modules ) ) {
2661                         return $links;
2662                 }
2663
2664                 if ( count( $modules ) > 1 ) {
2665                         // Remove duplicate module requests
2666                         $modules = array_unique( $modules );
2667                         // Sort module names so requests are more uniform
2668                         sort( $modules );
2669
2670                         if ( ResourceLoader::inDebugMode() ) {
2671                                 // Recursively call us for every item
2672                                 foreach ( $modules as $name ) {
2673                                         $link = $this->makeResourceLoaderLink( $name, $only, $useESI );
2674                                         $links['html'] .= $link['html'];
2675                                         $links['states'] += $link['states'];
2676                                 }
2677                                 return $links;
2678                         }
2679                 }
2680
2681                 if ( !is_null( $this->mTarget ) ) {
2682                         $extraQuery['target'] = $this->mTarget;
2683                 }
2684
2685                 // Create keyed-by-source and then keyed-by-group list of module objects from modules list
2686                 $sortedModules = array();
2687                 $resourceLoader = $this->getResourceLoader();
2688                 $resourceLoaderUseESI = $this->getConfig()->get( 'ResourceLoaderUseESI' );
2689                 foreach ( $modules as $name ) {
2690                         $module = $resourceLoader->getModule( $name );
2691                         # Check that we're allowed to include this module on this page
2692                         if ( !$module
2693                                 || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_SCRIPTS )
2694                                         && $only == ResourceLoaderModule::TYPE_SCRIPTS )
2695                                 || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_STYLES )
2696                                         && $only == ResourceLoaderModule::TYPE_STYLES )
2697                                 || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_COMBINED )
2698                                         && $only == ResourceLoaderModule::TYPE_COMBINED )
2699                                 || ( $this->mTarget && !in_array( $this->mTarget, $module->getTargets() ) )
2700                         ) {
2701                                 continue;
2702                         }
2703
2704                         $sortedModules[$module->getSource()][$module->getGroup()][$name] = $module;
2705                 }
2706
2707                 foreach ( $sortedModules as $source => $groups ) {
2708                         foreach ( $groups as $group => $grpModules ) {
2709                                 // Special handling for user-specific groups
2710                                 $user = null;
2711                                 if ( ( $group === 'user' || $group === 'private' ) && $this->getUser()->isLoggedIn() ) {
2712                                         $user = $this->getUser()->getName();
2713                                 }
2714
2715                                 // Create a fake request based on the one we are about to make so modules return
2716                                 // correct timestamp and emptiness data
2717                                 $query = ResourceLoader::makeLoaderQuery(
2718                                         array(), // modules; not determined yet
2719                                         $this->getLanguage()->getCode(),
2720                                         $this->getSkin()->getSkinName(),
2721                                         $user,
2722                                         null, // version; not determined yet
2723                                         ResourceLoader::inDebugMode(),
2724                                         $only === ResourceLoaderModule::TYPE_COMBINED ? null : $only,
2725                                         $this->isPrintable(),
2726                                         $this->getRequest()->getBool( 'handheld' ),
2727                                         $extraQuery
2728                                 );
2729                                 $context = new ResourceLoaderContext( $resourceLoader, new FauxRequest( $query ) );
2730
2731                                 // Extract modules that know they're empty and see if we have one or more
2732                                 // raw modules
2733                                 $isRaw = false;
2734                                 foreach ( $grpModules as $key => $module ) {
2735                                         // Inline empty modules: since they're empty, just mark them as 'ready' (bug 46857)
2736                                         // If we're only getting the styles, we don't need to do anything for empty modules.
2737                                         if ( $module->isKnownEmpty( $context ) ) {
2738                                                 unset( $grpModules[$key] );
2739                                                 if ( $only !== ResourceLoaderModule::TYPE_STYLES ) {
2740                                                         $links['states'][$key] = 'ready';
2741                                                 }
2742                                         }
2743
2744                                         $isRaw |= $module->isRaw();
2745                                 }
2746
2747                                 // If there are no non-empty modules, skip this group
2748                                 if ( count( $grpModules ) === 0 ) {
2749                                         continue;
2750                                 }
2751
2752                                 // Inline private modules. These can't be loaded through load.php for security
2753                                 // reasons, see bug 34907. Note that these modules should be loaded from
2754                                 // getHeadScripts() before the first loader call. Otherwise other modules can't
2755                                 // properly use them as dependencies (bug 30914)
2756                                 if ( $group === 'private' ) {
2757                                         if ( $only == ResourceLoaderModule::TYPE_STYLES ) {
2758                                                 $links['html'] .= Html::inlineStyle(
2759                                                         $resourceLoader->makeModuleResponse( $context, $grpModules )
2760                                                 );
2761                                         } else {
2762                                                 $links['html'] .= Html::inlineScript(
2763                                                         ResourceLoader::makeLoaderConditionalScript(
2764                                                                 $resourceLoader->makeModuleResponse( $context, $grpModules )
2765                                                         )
2766                                                 );
2767                                         }
2768                                         $links['html'] .= "\n";
2769                                         continue;
2770                                 }
2771
2772                                 // Special handling for the user group; because users might change their stuff
2773                                 // on-wiki like user pages, or user preferences; we need to find the highest
2774                                 // timestamp of these user-changeable modules so we can ensure cache misses on change
2775                                 // This should NOT be done for the site group (bug 27564) because anons get that too
2776                                 // and we shouldn't be putting timestamps in Squid-cached HTML
2777                                 $version = null;
2778                                 if ( $group === 'user' ) {
2779                                         // Get the maximum timestamp
2780                                         $timestamp = 1;
2781                                         foreach ( $grpModules as $module ) {
2782                                                 $timestamp = max( $timestamp, $module->getModifiedTime( $context ) );
2783                                         }
2784                                         // Add a version parameter so cache will break when things change
2785                                         $query['version'] = wfTimestamp( TS_ISO_8601_BASIC, $timestamp );
2786                                 }
2787
2788                                 $query['modules'] = ResourceLoader::makePackedModulesString( array_keys( $grpModules ) );
2789                                 $moduleContext = new ResourceLoaderContext( $resourceLoader, new FauxRequest( $query ) );
2790                                 $url = $resourceLoader->createLoaderURL( $source, $moduleContext, $extraQuery );
2791
2792                                 if ( $useESI && $resourceLoaderUseESI ) {
2793                                         $esi = Xml::element( 'esi:include', array( 'src' => $url ) );
2794                                         if ( $only == ResourceLoaderModule::TYPE_STYLES ) {
2795                                                 $link = Html::inlineStyle( $esi );
2796                                         } else {
2797                                                 $link = Html::inlineScript( $esi );
2798                                         }
2799                                 } else {
2800                                         // Automatically select style/script elements
2801                                         if ( $only === ResourceLoaderModule::TYPE_STYLES ) {
2802                                                 $link = Html::linkedStyle( $url );
2803                                         } elseif ( $loadCall ) {
2804                                                 $link = Html::inlineScript(
2805                                                         ResourceLoader::makeLoaderConditionalScript(
2806                                                                 Xml::encodeJsCall( 'mw.loader.load', array( $url, 'text/javascript', true ) )
2807                                                         )
2808                                                 );
2809                                         } else {
2810                                                 $link = Html::linkedScript( $url );
2811                                                 if ( $context->getOnly() === 'scripts' && !$context->getRaw() && !$isRaw ) {
2812                                                         // Wrap only=script requests in a conditional as browsers not supported
2813                                                         // by the startup module would unconditionally execute this module.
2814                                                         // Otherwise users will get "ReferenceError: mw is undefined" or
2815                                                         // "jQuery is undefined" from e.g. a "site" module.
2816                                                         $link = Html::inlineScript(
2817                                                                 ResourceLoader::makeLoaderConditionalScript(
2818                                                                         Xml::encodeJsCall( 'document.write', array( $link ) )
2819                                                                 )
2820                                                         );
2821                                                 }
2822
2823                                                 // For modules requested directly in the html via <link> or <script>,
2824                                                 // tell mw.loader they are being loading to prevent duplicate requests.
2825                                                 foreach ( $grpModules as $key => $module ) {
2826                                                         // Don't output state=loading for the startup module..
2827                                                         if ( $key !== 'startup' ) {
2828                                                                 $links['states'][$key] = 'loading';
2829                                                         }
2830                                                 }
2831                                         }
2832                                 }
2833
2834                                 if ( $group == 'noscript' ) {
2835                                         $links['html'] .= Html::rawElement( 'noscript', array(), $link ) . "\n";
2836                                 } else {
2837                                         $links['html'] .= $link . "\n";
2838                                 }
2839                         }
2840                 }
2841
2842                 return $links;
2843         }
2844
2845         /**
2846          * Build html output from an array of links from makeResourceLoaderLink.
2847          * @param array $links
2848          * @return string HTML
2849          */
2850         protected static function getHtmlFromLoaderLinks( array $links ) {
2851                 $html = '';
2852                 $states = array();
2853                 foreach ( $links as $link ) {
2854                         if ( !is_array( $link ) ) {
2855                                 $html .= $link;
2856                         } else {
2857                                 $html .= $link['html'];
2858                                 $states += $link['states'];
2859                         }
2860                 }
2861
2862                 if ( count( $states ) ) {
2863                         $html = Html::inlineScript(
2864                                 ResourceLoader::makeLoaderConditionalScript(
2865                                         ResourceLoader::makeLoaderStateScript( $states )
2866                                 )
2867                         ) . "\n" . $html;
2868                 }
2869
2870                 return $html;
2871         }
2872
2873         /**
2874          * JS stuff to put in the "<head>". This is the startup module, config
2875          * vars and modules marked with position 'top'
2876          *
2877          * @return string HTML fragment
2878          */
2879         function getHeadScripts() {
2880                 // Startup - this will immediately load jquery and mediawiki modules
2881                 $links = array();
2882                 $links[] = $this->makeResourceLoaderLink( 'startup', ResourceLoaderModule::TYPE_SCRIPTS, true );
2883
2884                 // Load config before anything else
2885                 $links[] = Html::inlineScript(
2886                         ResourceLoader::makeLoaderConditionalScript(
2887                                 ResourceLoader::makeConfigSetScript( $this->getJSVars() )
2888                         )
2889                 );
2890
2891                 // Load embeddable private modules before any loader links
2892                 // This needs to be TYPE_COMBINED so these modules are properly wrapped
2893                 // in mw.loader.implement() calls and deferred until mw.user is available
2894                 $embedScripts = array( 'user.options', 'user.tokens' );
2895                 $links[] = $this->makeResourceLoaderLink( $embedScripts, ResourceLoaderModule::TYPE_COMBINED );
2896
2897                 // Scripts and messages "only" requests marked for top inclusion
2898                 // Messages should go first
2899                 $links[] = $this->makeResourceLoaderLink(
2900                         $this->getModuleMessages( true, 'top' ),
2901                         ResourceLoaderModule::TYPE_MESSAGES
2902                 );
2903                 $links[] = $this->makeResourceLoaderLink(
2904                         $this->getModuleScripts( true, 'top' ),
2905                         ResourceLoaderModule::TYPE_SCRIPTS
2906                 );
2907
2908                 // Modules requests - let the client calculate dependencies and batch requests as it likes
2909                 // Only load modules that have marked themselves for loading at the top
2910                 $modules = $this->getModules( true, 'top' );
2911                 if ( $modules ) {
2912                         $links[] = Html::inlineScript(
2913                                 ResourceLoader::makeLoaderConditionalScript(
2914                                         Xml::encodeJsCall( 'mw.loader.load', array( $modules ) )
2915                                 )
2916                         );
2917                 }
2918
2919                 if ( $this->getConfig()->get( 'ResourceLoaderExperimentalAsyncLoading' ) ) {
2920                         $links[] = $this->getScriptsForBottomQueue( true );
2921                 }
2922
2923                 return self::getHtmlFromLoaderLinks( $links );
2924         }
2925
2926         /**
2927          * JS stuff to put at the 'bottom', which can either be the bottom of the
2928          * "<body>" or the bottom of the "<head>" depending on
2929          * $wgResourceLoaderExperimentalAsyncLoading: modules marked with position
2930          * 'bottom', legacy scripts ($this->mScripts), user preferences, site JS
2931          * and user JS.
2932          *
2933          * @param bool $inHead If true, this HTML goes into the "<head>",
2934          *   if false it goes into the "<body>".
2935          * @return string
2936          */
2937         function getScriptsForBottomQueue( $inHead ) {
2938                 // Scripts and messages "only" requests marked for bottom inclusion
2939                 // If we're in the <head>, use load() calls rather than <script src="..."> tags
2940                 // Messages should go first
2941                 $links = array();
2942                 $links[] = $this->makeResourceLoaderLink( $this->getModuleMessages( true, 'bottom' ),
2943                         ResourceLoaderModule::TYPE_MESSAGES, /* $useESI = */ false, /* $extraQuery = */ array(),
2944                         /* $loadCall = */ $inHead
2945                 );
2946                 $links[] = $this->makeResourceLoaderLink( $this->getModuleScripts( true, 'bottom' ),
2947                         ResourceLoaderModule::TYPE_SCRIPTS, /* $useESI = */ false, /* $extraQuery = */ array(),
2948                         /* $loadCall = */ $inHead
2949                 );
2950
2951                 // Modules requests - let the client calculate dependencies and batch requests as it likes
2952                 // Only load modules that have marked themselves for loading at the bottom
2953                 $modules = $this->getModules( true, 'bottom' );
2954                 if ( $modules ) {
2955                         $links[] = Html::inlineScript(
2956                                 ResourceLoader::makeLoaderConditionalScript(
2957                                         Xml::encodeJsCall( 'mw.loader.load', array( $modules, null, true ) )
2958                                 )
2959                         );
2960                 }
2961
2962                 // Legacy Scripts
2963                 $links[] = "\n" . $this->mScripts;
2964
2965                 // Add site JS if enabled
2966                 $links[] = $this->makeResourceLoaderLink( 'site', ResourceLoaderModule::TYPE_SCRIPTS,
2967                         /* $useESI = */ false, /* $extraQuery = */ array(), /* $loadCall = */ $inHead
2968                 );
2969
2970                 // Add user JS if enabled
2971                 if ( $this->getConfig()->get( 'AllowUserJs' )
2972                         && $this->getUser()->isLoggedIn()
2973                         && $this->getTitle()
2974                         && $this->getTitle()->isJsSubpage()
2975                         && $this->userCanPreview()
2976                 ) {
2977                         # XXX: additional security check/prompt?
2978                         // We're on a preview of a JS subpage
2979                         // Exclude this page from the user module in case it's in there (bug 26283)
2980                         $links[] = $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_SCRIPTS, false,
2981                                 array( 'excludepage' => $this->getTitle()->getPrefixedDBkey() ), $inHead
2982                         );
2983                         // Load the previewed JS
2984                         $links[] = Html::inlineScript( "\n"
2985                                         . $this->getRequest()->getText( 'wpTextbox1' ) . "\n" ) . "\n";
2986
2987                         // FIXME: If the user is previewing, say, ./vector.js, his ./common.js will be loaded
2988                         // asynchronously and may arrive *after* the inline script here. So the previewed code
2989                         // may execute before ./common.js runs. Normally, ./common.js runs before ./vector.js...
2990                 } else {
2991                         // Include the user module normally, i.e., raw to avoid it being wrapped in a closure.
2992                         $links[] = $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_SCRIPTS,
2993                                 /* $useESI = */ false, /* $extraQuery = */ array(), /* $loadCall = */ $inHead
2994                         );
2995                 }
2996
2997                 // Group JS is only enabled if site JS is enabled.
2998                 $links[] = $this->makeResourceLoaderLink( 'user.groups', ResourceLoaderModule::TYPE_COMBINED,
2999                         /* $useESI = */ false, /* $extraQuery = */ array(), /* $loadCall = */ $inHead
3000                 );
3001
3002                 return self::getHtmlFromLoaderLinks( $links );
3003         }
3004
3005         /**
3006          * JS stuff to put at the bottom of the "<body>"
3007          * @return string
3008          */
3009         function getBottomScripts() {
3010                 // Optimise jQuery ready event cross-browser.
3011                 // This also enforces $.isReady to be true at </body> which fixes the
3012                 // mw.loader bug in Firefox with using document.write between </body>
3013                 // and the DOMContentReady event (bug 47457).
3014                 $html = Html::inlineScript( 'window.jQuery && jQuery.ready();' );
3015
3016                 if ( !$this->getConfig()->get( 'ResourceLoaderExperimentalAsyncLoading' ) ) {
3017                         $html .= $this->getScriptsForBottomQueue( false );
3018                 }
3019
3020                 return $html;
3021         }
3022
3023         /**
3024          * Get the javascript config vars to include on this page
3025          *
3026          * @return array Array of javascript config vars
3027          * @since 1.23
3028          */
3029         public function getJsConfigVars() {
3030                 return $this->mJsConfigVars;
3031         }
3032
3033         /**
3034          * Add one or more variables to be set in mw.config in JavaScript
3035          *
3036          * @param string|array $keys Key or array of key/value pairs
3037          * @param mixed $value [optional] Value of the configuration variable
3038          */
3039         public function addJsConfigVars( $keys, $value = null ) {
3040                 if ( is_array( $keys ) ) {
3041                         foreach ( $keys as $key => $value ) {
3042                                 $this->mJsConfigVars[$key] = $value;
3043                         }
3044                         return;
3045                 }
3046
3047                 $this->mJsConfigVars[$keys] = $value;
3048         }
3049
3050         /**
3051          * Get an array containing the variables to be set in mw.config in JavaScript.
3052          *
3053          * Do not add things here which can be evaluated in ResourceLoaderStartUpModule
3054          * - in other words, page-independent/site-wide variables (without state).
3055          * You will only be adding bloat to the html page and causing page caches to
3056          * have to be purged on configuration changes.
3057          * @return array
3058          */
3059         private function getJSVars() {
3060                 global $wgContLang;
3061
3062                 $curRevisionId = 0;
3063                 $articleId = 0;
3064                 $canonicalSpecialPageName = false; # bug 21115
3065
3066                 $title = $this->getTitle();
3067                 $ns = $title->getNamespace();
3068                 $canonicalNamespace = MWNamespace::exists( $ns )
3069                         ? MWNamespace::getCanonicalName( $ns )
3070                         : $title->getNsText();
3071
3072                 $sk = $this->getSkin();
3073                 // Get the relevant title so that AJAX features can use the correct page name
3074                 // when making API requests from certain special pages (bug 34972).
3075                 $relevantTitle = $sk->getRelevantTitle();
3076                 $relevantUser = $sk->getRelevantUser();
3077
3078                 if ( $ns == NS_SPECIAL ) {
3079                         list( $canonicalSpecialPageName, /*...*/ ) =
3080                                 SpecialPageFactory::resolveAlias( $title->getDBkey() );
3081                 } elseif ( $this->canUseWikiPage() ) {
3082                         $wikiPage = $this->getWikiPage();
3083                         $curRevisionId = $wikiPage->getLatest();
3084                         $articleId = $wikiPage->getId();
3085                 }
3086
3087                 $lang = $title->getPageLanguage();
3088
3089                 // Pre-process information
3090                 $separatorTransTable = $lang->separatorTransformTable();
3091                 $separatorTransTable = $separatorTransTable ? $separatorTransTable : array();
3092                 $compactSeparatorTransTable = array(
3093                         implode( "\t", array_keys( $separatorTransTable ) ),
3094                         implode( "\t", $separatorTransTable ),
3095                 );
3096                 $digitTransTable = $lang->digitTransformTable();
3097                 $digitTransTable = $digitTransTable ? $digitTransTable : array();
3098                 $compactDigitTransTable = array(
3099                         implode( "\t", array_keys( $digitTransTable ) ),
3100                         implode( "\t", $digitTransTable ),
3101                 );
3102
3103                 $user = $this->getUser();
3104
3105                 $vars = array(
3106                         'wgCanonicalNamespace' => $canonicalNamespace,
3107                         'wgCanonicalSpecialPageName' => $canonicalSpecialPageName,
3108                         'wgNamespaceNumber' => $title->getNamespace(),
3109                         'wgPageName' => $title->getPrefixedDBkey(),
3110                         'wgTitle' => $title->getText(),
3111                         'wgCurRevisionId' => $curRevisionId,
3112                         'wgRevisionId' => (int)$this->getRevisionId(),
3113                         'wgArticleId' => $articleId,
3114                         'wgIsArticle' => $this->isArticle(),
3115                         'wgIsRedirect' => $title->isRedirect(),
3116                         'wgAction' => Action::getActionName( $this->getContext() ),
3117                         'wgUserName' => $user->isAnon() ? null : $user->getName(),
3118                         'wgUserGroups' => $user->getEffectiveGroups(),
3119                         'wgCategories' => $this->getCategories(),
3120                         'wgBreakFrames' => $this->getFrameOptions() == 'DENY',
3121                         'wgPageContentLanguage' => $lang->getCode(),
3122                         'wgPageContentModel' => $title->getContentModel(),
3123                         'wgSeparatorTransformTable' => $compactSeparatorTransTable,
3124                         'wgDigitTransformTable' => $compactDigitTransTable,
3125                         'wgDefaultDateFormat' => $lang->getDefaultDateFormat(),
3126                         'wgMonthNames' => $lang->getMonthNamesArray(),
3127                         'wgMonthNamesShort' => $lang->getMonthAbbreviationsArray(),
3128                         'wgRelevantPageName' => $relevantTitle->getPrefixedDBkey(),
3129                 );
3130
3131                 if ( $user->isLoggedIn() ) {
3132                         $vars['wgUserId'] = $user->getId();
3133                         $vars['wgUserEditCount'] = $user->getEditCount();
3134                         $userReg = wfTimestampOrNull( TS_UNIX, $user->getRegistration() );
3135                         $vars['wgUserRegistration'] = $userReg !== null ? ( $userReg * 1000 ) : null;
3136                         // Get the revision ID of the oldest new message on the user's talk
3137                         // page. This can be used for constructing new message alerts on
3138                         // the client side.
3139                         $vars['wgUserNewMsgRevisionId'] = $user->getNewMessageRevisionId();
3140                 }
3141
3142                 if ( $wgContLang->hasVariants() ) {
3143                         $vars['wgUserVariant'] = $wgContLang->getPreferredVariant();
3144                 }
3145                 // Same test as SkinTemplate
3146                 $vars['wgIsProbablyEditable'] = $title->quickUserCan( 'edit', $user )
3147                         && ( $title->exists() || $title->quickUserCan( 'create', $user ) );
3148
3149                 foreach ( $title->getRestrictionTypes() as $type ) {
3150                         $vars['wgRestriction' . ucfirst( $type )] = $title->getRestrictions( $type );
3151                 }
3152
3153                 if ( $title->isMainPage() ) {
3154                         $vars['wgIsMainPage'] = true;
3155                 }
3156
3157                 if ( $this->mRedirectedFrom ) {
3158                         $vars['wgRedirectedFrom'] = $this->mRedirectedFrom->getPrefixedDBkey();
3159                 }
3160
3161                 if ( $relevantUser ) {
3162                         $vars['wgRelevantUserName'] = $relevantUser->getName();
3163                 }
3164
3165                 // Allow extensions to add their custom variables to the mw.config map.
3166                 // Use the 'ResourceLoaderGetConfigVars' hook if the variable is not
3167                 // page-dependant but site-wide (without state).
3168                 // Alternatively, you may want to use OutputPage->addJsConfigVars() instead.
3169                 wfRunHooks( 'MakeGlobalVariablesScript', array( &$vars, $this ) );
3170
3171                 // Merge in variables from addJsConfigVars last
3172                 return array_merge( $vars, $this->getJsConfigVars() );
3173         }
3174
3175         /**
3176          * To make it harder for someone to slip a user a fake
3177          * user-JavaScript or user-CSS preview, a random token
3178          * is associated with the login session. If it's not
3179          * passed back with the preview request, we won't render
3180          * the code.
3181          *
3182          * @return bool
3183          */
3184         public function userCanPreview() {
3185                 if ( $this->getRequest()->getVal( 'action' ) != 'submit'
3186                         || !$this->getRequest()->wasPosted()
3187                         || !$this->getUser()->matchEditToken(
3188                                 $this->getRequest()->getVal( 'wpEditToken' ) )
3189                 ) {
3190                         return false;
3191                 }
3192                 if ( !$this->getTitle()->isJsSubpage() && !$this->getTitle()->isCssSubpage() ) {
3193                         return false;
3194                 }
3195
3196                 return !count( $this->getTitle()->getUserPermissionsErrors( 'edit', $this->getUser() ) );
3197         }
3198
3199         /**
3200          * @return array Array in format "link name or number => 'link html'".
3201          */
3202         public function getHeadLinksArray() {
3203                 global $wgVersion;
3204
3205                 $tags = array();
3206                 $config = $this->getConfig();
3207
3208                 $canonicalUrl = $this->mCanonicalUrl;
3209
3210                 $tags['meta-generator'] = Html::element( 'meta', array(
3211                         'name' => 'generator',
3212                         'content' => "MediaWiki $wgVersion",
3213                 ) );
3214
3215                 $p = "{$this->mIndexPolicy},{$this->mFollowPolicy}";
3216                 if ( $p !== 'index,follow' ) {
3217                         // http://www.robotstxt.org/wc/meta-user.html
3218                         // Only show if it's different from the default robots policy
3219                         $tags['meta-robots'] = Html::element( 'meta', array(
3220                                 'name' => 'robots',
3221                                 'content' => $p,
3222                         ) );
3223                 }
3224
3225                 foreach ( $this->mMetatags as $tag ) {
3226                         if ( 0 == strcasecmp( 'http:', substr( $tag[0], 0, 5 ) ) ) {
3227                                 $a = 'http-equiv';
3228                                 $tag[0] = substr( $tag[0], 5 );
3229                         } else {
3230                                 $a = 'name';
3231                         }
3232                         $tagName = "meta-{$tag[0]}";
3233                         if ( isset( $tags[$tagName] ) ) {
3234                                 $tagName .= $tag[1];
3235                         }
3236                         $tags[$tagName] = Html::element( 'meta',
3237                                 array(
3238                                         $a => $tag[0],
3239                                         'content' => $tag[1]
3240                                 )
3241                         );
3242                 }
3243
3244                 foreach ( $this->mLinktags as $tag ) {
3245                         $tags[] = Html::element( 'link', $tag );
3246                 }
3247
3248                 # Universal edit button
3249                 if ( $config->get( 'UniversalEditButton' ) && $this->isArticleRelated() ) {
3250                         $user = $this->getUser();
3251                         if ( $this->getTitle()->quickUserCan( 'edit', $user )
3252                                 && ( $this->getTitle()->exists() || $this->getTitle()->quickUserCan( 'create', $user ) ) ) {
3253                                 // Original UniversalEditButton
3254                                 $msg = $this->msg( 'edit' )->text();
3255                                 $tags['universal-edit-button'] = Html::element( 'link', array(
3256                                         'rel' => 'alternate',
3257                                         'type' => 'application/x-wiki',
3258                                         'title' => $msg,
3259                                         'href' => $this->getTitle()->getEditURL(),
3260                                 ) );
3261                                 // Alternate edit link
3262                                 $tags['alternative-edit'] = Html::element( 'link', array(
3263                                         'rel' => 'edit',
3264                                         'title' => $msg,
3265                                         'href' => $this->getTitle()->getEditURL(),
3266                                 ) );
3267                         }
3268                 }
3269
3270                 # Generally the order of the favicon and apple-touch-icon links
3271                 # should not matter, but Konqueror (3.5.9 at least) incorrectly
3272                 # uses whichever one appears later in the HTML source. Make sure
3273                 # apple-touch-icon is specified first to avoid this.
3274                 if ( $config->get( 'AppleTouchIcon' ) !== false ) {
3275                         $tags['apple-touch-icon'] = Html::element( 'link', array(
3276                                 'rel' => 'apple-touch-icon',
3277                                 'href' => $config->get( 'AppleTouchIcon' )
3278                         ) );
3279                 }
3280
3281                 if ( $config->get( 'Favicon' ) !== false ) {
3282                         $tags['favicon'] = Html::element( 'link', array(
3283                                 'rel' => 'shortcut icon',
3284                                 'href' => $config->get( 'Favicon' )
3285                         ) );
3286                 }
3287
3288                 # OpenSearch description link
3289                 $tags['opensearch'] = Html::element( 'link', array(
3290                         'rel' => 'search',
3291                         'type' => 'application/opensearchdescription+xml',
3292                         'href' => wfScript( 'opensearch_desc' ),
3293                         'title' => $this->msg( 'opensearch-desc' )->inContentLanguage()->text(),
3294                 ) );
3295
3296                 if ( $config->get( 'EnableAPI' ) ) {
3297                         # Real Simple Discovery link, provides auto-discovery information
3298                         # for the MediaWiki API (and potentially additional custom API
3299                         # support such as WordPress or Twitter-compatible APIs for a
3300                         # blogging extension, etc)
3301                         $tags['rsd'] = Html::element( 'link', array(
3302                                 'rel' => 'EditURI',
3303                                 'type' => 'application/rsd+xml',
3304                                 // Output a protocol-relative URL here if $wgServer is protocol-relative
3305                                 // Whether RSD accepts relative or protocol-relative URLs is completely undocumented, though
3306                                 'href' => wfExpandUrl( wfAppendQuery(
3307                                         wfScript( 'api' ),
3308                                         array( 'action' => 'rsd' ) ),
3309                                         PROTO_RELATIVE
3310                                 ),
3311                         ) );
3312                 }
3313
3314                 # Language variants
3315                 if ( !$config->get( 'DisableLangConversion' ) ) {
3316                         $lang = $this->getTitle()->getPageLanguage();
3317                         if ( $lang->hasVariants() ) {
3318                                 $variants = $lang->getVariants();
3319                                 foreach ( $variants as $_v ) {
3320                                         $tags["variant-$_v"] = Html::element( 'link', array(
3321                                                 'rel' => 'alternate',
3322                                                 'hreflang' => wfBCP47( $_v ),
3323                                                 'href' => $this->getTitle()->getLocalURL( array( 'variant' => $_v ) ) )
3324                                         );
3325                                 }
3326                         }
3327                         # x-default link per https://support.google.com/webmasters/answer/189077?hl=en
3328                         $tags["variant-x-default"] = Html::element( 'link', array(
3329                                 'rel' => 'alternate',
3330                                 'hreflang' => 'x-default',
3331                                 'href' => $this->getTitle()->getLocalURL() ) );
3332                 }
3333
3334                 # Copyright
3335                 $copyright = '';
3336                 if ( $config->get( 'RightsPage' ) ) {
3337                         $copy = Title::newFromText( $config->get( 'RightsPage' ) );
3338
3339                         if ( $copy ) {
3340                                 $copyright = $copy->getLocalURL();
3341                         }
3342                 }
3343
3344                 if ( !$copyright && $config->get( 'RightsUrl' ) ) {
3345                         $copyright = $config->get( 'RightsUrl' );
3346                 }
3347
3348                 if ( $copyright ) {
3349                         $tags['copyright'] = Html::element( 'link', array(
3350                                 'rel' => 'copyright',
3351                                 'href' => $copyright )
3352                         );
3353                 }
3354
3355                 # Feeds
3356                 if ( $config->get( 'Feed' ) ) {
3357                         foreach ( $this->getSyndicationLinks() as $format => $link ) {
3358                                 # Use the page name for the title.  In principle, this could
3359                                 # lead to issues with having the same name for different feeds
3360                                 # corresponding to the same page, but we can't avoid that at
3361                                 # this low a level.
3362
3363                                 $tags[] = $this->feedLink(
3364                                         $format,
3365                                         $link,
3366                                         # Used messages: 'page-rss-feed' and 'page-atom-feed' (for an easier grep)
3367                                         $this->msg( "page-{$format}-feed", $this->getTitle()->getPrefixedText() )->text()
3368                                 );
3369                         }
3370
3371                         # Recent changes feed should appear on every page (except recentchanges,
3372                         # that would be redundant). Put it after the per-page feed to avoid
3373                         # changing existing behavior. It's still available, probably via a
3374                         # menu in your browser. Some sites might have a different feed they'd
3375                         # like to promote instead of the RC feed (maybe like a "Recent New Articles"
3376                         # or "Breaking news" one). For this, we see if $wgOverrideSiteFeed is defined.
3377                         # If so, use it instead.
3378                         $sitename = $config->get( 'Sitename' );
3379                         if ( $config->get( 'OverrideSiteFeed' ) ) {
3380                                 foreach ( $config->get( 'OverrideSiteFeed' ) as $type => $feedUrl ) {
3381                                         // Note, this->feedLink escapes the url.
3382                                         $tags[] = $this->feedLink(
3383                                                 $type,
3384                                                 $feedUrl,
3385                                                 $this->msg( "site-{$type}-feed", $sitename )->text()
3386                                         );
3387                                 }
3388                         } elseif ( !$this->getTitle()->isSpecial( 'Recentchanges' ) ) {
3389                                 $rctitle = SpecialPage::getTitleFor( 'Recentchanges' );
3390                                 foreach ( $config->get( 'AdvertisedFeedTypes' ) as $format ) {
3391                                         $tags[] = $this->feedLink(
3392                                                 $format,
3393                                                 $rctitle->getLocalURL( array( 'feed' => $format ) ),
3394                                                 # For grep: 'site-rss-feed', 'site-atom-feed'
3395                                                 $this->msg( "site-{$format}-feed", $sitename )->text()
3396                                         );
3397                                 }
3398                         }
3399                 }
3400
3401                 # Canonical URL
3402                 if ( $config->get( 'EnableCanonicalServerLink' ) ) {
3403                         if ( $canonicalUrl !== false ) {
3404                                 $canonicalUrl = wfExpandUrl( $canonicalUrl, PROTO_CANONICAL );
3405                         } else {
3406                                 $reqUrl = $this->getRequest()->getRequestURL();
3407                                 $canonicalUrl = wfExpandUrl( $reqUrl, PROTO_CANONICAL );
3408                         }
3409                 }
3410                 if ( $canonicalUrl !== false ) {
3411                         $tags[] = Html::element( 'link', array(
3412                                 'rel' => 'canonical',
3413                                 'href' => $canonicalUrl
3414                         ) );
3415                 }
3416
3417                 return $tags;
3418         }
3419
3420         /**
3421          * @return string HTML tag links to be put in the header.
3422          * @deprecated since 1.24 Use OutputPage::headElement or if you have to,
3423          *   OutputPage::getHeadLinksArray directly.
3424          */
3425         public function getHeadLinks() {
3426                 wfDeprecated( __METHOD__, '1.24' );
3427                 return implode( "\n", $this->getHeadLinksArray() );
3428         }
3429
3430         /**
3431          * Generate a "<link rel/>" for a feed.
3432          *
3433          * @param string $type Feed type
3434          * @param string $url URL to the feed
3435          * @param string $text Value of the "title" attribute
3436          * @return string HTML fragment
3437          */
3438         private function feedLink( $type, $url, $text ) {
3439                 return Html::element( 'link', array(
3440                         'rel' => 'alternate',
3441                         'type' => "application/$type+xml",
3442                         'title' => $text,
3443                         'href' => $url )
3444                 );
3445         }
3446
3447         /**
3448          * Add a local or specified stylesheet, with the given media options.
3449          * Meant primarily for internal use...
3450          *
3451          * @param string $style URL to the file
3452          * @param string $media To specify a media type, 'screen', 'printable', 'handheld' or any.
3453          * @param string $condition For IE conditional comments, specifying an IE version
3454          * @param string $dir Set to 'rtl' or 'ltr' for direction-specific sheets
3455          */
3456         public function addStyle( $style, $media = '', $condition = '', $dir = '' ) {
3457                 $options = array();
3458                 // Even though we expect the media type to be lowercase, but here we
3459                 // force it to lowercase to be safe.
3460                 if ( $media ) {
3461                         $options['media'] = $media;
3462                 }
3463                 if ( $condition ) {
3464                         $options['condition'] = $condition;
3465                 }
3466                 if ( $dir ) {
3467                         $options['dir'] = $dir;
3468                 }
3469                 $this->styles[$style] = $options;
3470         }
3471
3472         /**
3473          * Adds inline CSS styles
3474          * @param mixed $style_css Inline CSS
3475          * @param string $flip Set to 'flip' to flip the CSS if needed
3476          */
3477         public function addInlineStyle( $style_css, $flip = 'noflip' ) {
3478                 if ( $flip === 'flip' && $this->getLanguage()->isRTL() ) {
3479                         # If wanted, and the interface is right-to-left, flip the CSS
3480                         $style_css = CSSJanus::transform( $style_css, true, false );
3481                 }
3482                 $this->mInlineStyles .= Html::inlineStyle( $style_css ) . "\n";
3483         }
3484
3485         /**
3486          * Build a set of "<link>" elements for the stylesheets specified in the $this->styles array.
3487          * These will be applied to various media & IE conditionals.
3488          *
3489          * @return string
3490          */
3491         public function buildCssLinks() {
3492                 global $wgContLang;
3493
3494                 $this->getSkin()->setupSkinUserCss( $this );
3495
3496                 // Add ResourceLoader styles
3497                 // Split the styles into these groups
3498                 $styles = array(
3499                         'other' => array(),
3500                         'user' => array(),
3501                         'site' => array(),
3502                         'private' => array(),
3503                         'noscript' => array()
3504                 );
3505                 $links = array();
3506                 $otherTags = ''; // Tags to append after the normal <link> tags
3507                 $resourceLoader = $this->getResourceLoader();
3508
3509                 $moduleStyles = $this->getModuleStyles();
3510
3511                 // Per-site custom styles
3512                 $moduleStyles[] = 'site';
3513                 $moduleStyles[] = 'noscript';
3514                 $moduleStyles[] = 'user.groups';
3515
3516                 // Per-user custom styles
3517                 if ( $this->getConfig()->get( 'AllowUserCss' ) && $this->getTitle()->isCssSubpage() && $this->userCanPreview() ) {
3518                         // We're on a preview of a CSS subpage
3519                         // Exclude this page from the user module in case it's in there (bug 26283)
3520                         $link = $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_STYLES, false,
3521                                 array( 'excludepage' => $this->getTitle()->getPrefixedDBkey() )
3522                         );
3523                         $otherTags .= $link['html'];
3524
3525                         // Load the previewed CSS
3526                         // If needed, Janus it first. This is user-supplied CSS, so it's
3527                         // assumed to be right for the content language directionality.
3528                         $previewedCSS = $this->getRequest()->getText( 'wpTextbox1' );
3529                         if ( $this->getLanguage()->getDir() !== $wgContLang->getDir() ) {
3530                                 $previewedCSS = CSSJanus::transform( $previewedCSS, true, false );
3531                         }
3532                         $otherTags .= Html::inlineStyle( $previewedCSS ) . "\n";
3533                 } else {
3534                         // Load the user styles normally
3535                         $moduleStyles[] = 'user';
3536                 }
3537
3538                 // Per-user preference styles
3539                 $moduleStyles[] = 'user.cssprefs';
3540
3541                 foreach ( $moduleStyles as $name ) {
3542                         $module = $resourceLoader->getModule( $name );
3543                         if ( !$module ) {
3544                                 continue;
3545                         }
3546                         $group = $module->getGroup();
3547                         // Modules in groups different than the ones listed on top (see $styles assignment)
3548                         // will be placed in the "other" group
3549                         $styles[isset( $styles[$group] ) ? $group : 'other'][] = $name;
3550                 }
3551
3552                 // We want site, private and user styles to override dynamically added
3553                 // styles from modules, but we want dynamically added styles to override
3554                 // statically added styles from other modules. So the order has to be
3555                 // other, dynamic, site, private, user. Add statically added styles for
3556                 // other modules
3557                 $links[] = $this->makeResourceLoaderLink( $styles['other'], ResourceLoaderModule::TYPE_STYLES );
3558                 // Add normal styles added through addStyle()/addInlineStyle() here
3559                 $links[] = implode( "\n", $this->buildCssLinksArray() ) . $this->mInlineStyles;
3560                 // Add marker tag to mark the place where the client-side loader should inject dynamic styles
3561                 // We use a <meta> tag with a made-up name for this because that's valid HTML
3562                 $links[] = Html::element(
3563                         'meta',
3564                         array( 'name' => 'ResourceLoaderDynamicStyles', 'content' => '' )
3565                 ) . "\n";
3566
3567                 // Add site, private and user styles
3568                 // 'private' at present only contains user.options, so put that before 'user'
3569                 // Any future private modules will likely have a similar user-specific character
3570                 foreach ( array( 'site', 'noscript', 'private', 'user' ) as $group ) {
3571                         $links[] = $this->makeResourceLoaderLink( $styles[$group],
3572                                 ResourceLoaderModule::TYPE_STYLES
3573                         );
3574                 }
3575
3576                 // Add stuff in $otherTags (previewed user CSS if applicable)
3577                 return self::getHtmlFromLoaderLinks( $links ) . $otherTags;
3578         }
3579
3580         /**
3581          * @return array
3582          */
3583         public function buildCssLinksArray() {
3584                 $links = array();
3585
3586                 // Add any extension CSS
3587                 foreach ( $this->mExtStyles as $url ) {
3588                         $this->addStyle( $url );
3589                 }
3590                 $this->mExtStyles = array();
3591
3592                 foreach ( $this->styles as $file => $options ) {
3593                         $link = $this->styleLink( $file, $options );
3594                         if ( $link ) {
3595                                 $links[$file] = $link;
3596                         }
3597                 }
3598                 return $links;
3599         }
3600
3601         /**
3602          * Generate \<link\> tags for stylesheets
3603          *
3604          * @param string $style URL to the file
3605          * @param array $options Option, can contain 'condition', 'dir', 'media' keys
3606          * @return string HTML fragment
3607          */
3608         protected function styleLink( $style, array $options ) {
3609                 if ( isset( $options['dir'] ) ) {
3610                         if ( $this->getLanguage()->getDir() != $options['dir'] ) {
3611                                 return '';
3612                         }
3613                 }
3614
3615                 if ( isset( $options['media'] ) ) {
3616                         $media = self::transformCssMedia( $options['media'] );
3617                         if ( is_null( $media ) ) {
3618                                 return '';
3619                         }
3620                 } else {
3621                         $media = 'all';
3622                 }
3623
3624                 if ( substr( $style, 0, 1 ) == '/' ||
3625                         substr( $style, 0, 5 ) == 'http:' ||
3626                         substr( $style, 0, 6 ) == 'https:' ) {
3627                         $url = $style;
3628                 } else {
3629                         $config = $this->getConfig();
3630                         $url = $config->get( 'StylePath' ) . '/' . $style . '?' . $config->get( 'StyleVersion' );
3631                 }
3632
3633                 $link = Html::linkedStyle( $url, $media );
3634
3635                 if ( isset( $options['condition'] ) ) {
3636                         $condition = htmlspecialchars( $options['condition'] );
3637                         $link = "<!--[if $condition]>$link<![endif]-->";
3638                 }
3639                 return $link;
3640         }
3641
3642         /**
3643          * Transform "media" attribute based on request parameters
3644          *
3645          * @param string $media Current value of the "media" attribute
3646          * @return string Modified value of the "media" attribute, or null to skip
3647          * this stylesheet
3648          */
3649         public static function transformCssMedia( $media ) {
3650                 global $wgRequest;
3651
3652                 // http://www.w3.org/TR/css3-mediaqueries/#syntax
3653                 $screenMediaQueryRegex = '/^(?:only\s+)?screen\b/i';
3654
3655                 // Switch in on-screen display for media testing
3656                 $switches = array(
3657                         'printable' => 'print',
3658                         'handheld' => 'handheld',
3659                 );
3660                 foreach ( $switches as $switch => $targetMedia ) {
3661                         if ( $wgRequest->getBool( $switch ) ) {
3662                                 if ( $media == $targetMedia ) {
3663                                         $media = '';
3664                                 } elseif ( preg_match( $screenMediaQueryRegex, $media ) === 1 ) {
3665                                         // This regex will not attempt to understand a comma-separated media_query_list
3666                                         //
3667                                         // Example supported values for $media:
3668                                         // 'screen', 'only screen', 'screen and (min-width: 982px)' ),
3669                                         // Example NOT supported value for $media:
3670                                         // '3d-glasses, screen, print and resolution > 90dpi'
3671                                         //
3672                                         // If it's a print request, we never want any kind of screen stylesheets
3673                                         // If it's a handheld request (currently the only other choice with a switch),
3674                                         // we don't want simple 'screen' but we might want screen queries that
3675                                         // have a max-width or something, so we'll pass all others on and let the
3676                                         // client do the query.
3677                                         if ( $targetMedia == 'print' || $media == 'screen' ) {
3678                                                 return null;
3679                                         }
3680                                 }
3681                         }
3682                 }
3683
3684                 return $media;
3685         }
3686
3687         /**
3688          * Add a wikitext-formatted message to the output.
3689          * This is equivalent to:
3690          *
3691          *    $wgOut->addWikiText( wfMessage( ... )->plain() )
3692          */
3693         public function addWikiMsg( /*...*/ ) {
3694                 $args = func_get_args();
3695                 $name = array_shift( $args );
3696                 $this->addWikiMsgArray( $name, $args );
3697         }
3698
3699         /**
3700          * Add a wikitext-formatted message to the output.
3701          * Like addWikiMsg() except the parameters are taken as an array
3702          * instead of a variable argument list.
3703          *
3704          * @param string $name
3705          * @param array $args
3706          */
3707         public function addWikiMsgArray( $name, $args ) {
3708                 $this->addHTML( $this->msg( $name, $args )->parseAsBlock() );
3709         }
3710
3711         /**
3712          * This function takes a number of message/argument specifications, wraps them in
3713          * some overall structure, and then parses the result and adds it to the output.
3714          *
3715          * In the $wrap, $1 is replaced with the first message, $2 with the second, and so
3716          * on. The subsequent arguments may either be strings, in which case they are the
3717          * message names, or arrays, in which case the first element is the message name,
3718          * and subsequent elements are the parameters to that message.
3719          *
3720          * Don't use this for messages that are not in users interface language.
3721          *
3722          * For example:
3723          *
3724          *    $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>", 'some-error' );
3725          *
3726          * Is equivalent to:
3727          *
3728          *    $wgOut->addWikiText( "<div class='error'>\n"
3729          *        . wfMessage( 'some-error' )->plain() . "\n</div>" );
3730          *
3731          * The newline after opening div is needed in some wikitext. See bug 19226.
3732          *
3733          * @param string $wrap
3734          */
3735         public function wrapWikiMsg( $wrap /*, ...*/ ) {
3736                 $msgSpecs = func_get_args();
3737                 array_shift( $msgSpecs );
3738                 $msgSpecs = array_values( $msgSpecs );
3739                 $s = $wrap;
3740                 foreach ( $msgSpecs as $n => $spec ) {
3741                         if ( is_array( $spec ) ) {
3742                                 $args = $spec;
3743                                 $name = array_shift( $args );
3744                                 if ( isset( $args['options'] ) ) {
3745                                         unset( $args['options'] );
3746                                         wfDeprecated(
3747                                                 'Adding "options" to ' . __METHOD__ . ' is no longer supported',
3748                                                 '1.20'
3749                                         );
3750                                 }
3751                         } else {
3752                                 $args = array();
3753                                 $name = $spec;
3754                         }
3755                         $s = str_replace( '$' . ( $n + 1 ), $this->msg( $name, $args )->plain(), $s );
3756                 }
3757                 $this->addWikiText( $s );
3758         }
3759
3760         /**
3761          * Include jQuery core. Use this to avoid loading it multiple times
3762          * before we get a usable script loader.
3763          *
3764          * @param array $modules List of jQuery modules which should be loaded
3765          * @return array The list of modules which were not loaded.
3766          * @since 1.16
3767          * @deprecated since 1.17
3768          */
3769         public function includeJQuery( array $modules = array() ) {
3770                 return array();
3771         }
3772
3773         /**
3774          * Enables/disables TOC, doesn't override __NOTOC__
3775          * @param bool $flag
3776          * @since 1.22
3777          */
3778         public function enableTOC( $flag = true ) {
3779                 $this->mEnableTOC = $flag;
3780         }
3781
3782         /**
3783          * @return bool
3784          * @since 1.22
3785          */
3786         public function isTOCEnabled() {
3787                 return $this->mEnableTOC;
3788         }
3789
3790         /**
3791          * Enables/disables section edit links, doesn't override __NOEDITSECTION__
3792          * @param bool $flag
3793          * @since 1.23
3794          */
3795         public function enableSectionEditLinks( $flag = true ) {
3796                 $this->mEnableSectionEditLinks = $flag;
3797         }
3798
3799         /**
3800          * @return bool
3801          * @since 1.23
3802          */
3803         public function sectionEditLinksEnabled() {
3804                 return $this->mEnableSectionEditLinks;
3805         }
3806 }