includes/OutputPage.php

   1 <?php
   2 /**
   3  * Preparation for the final page rendering.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 /**
  24  * This class should be covered by a general architecture document which does
  25  * not exist as of January 2011.  This is one of the Core classes and should
  26  * be read at least once by any new developers.
  27  *
  28  * This class is used to prepare the final rendering. A skin is then
  29  * applied to the output parameters (links, javascript, html, categories ...).
  30  *
  31  * @todo FIXME: Another class handles sending the whole page to the client.
  32  *
  33  * Some comments comes from a pairing session between Zak Greant and Antoine Musso
  34  * in November 2010.
  35  *
  36  * @todo document
  37  */
  38 class OutputPage extends ContextSource {
  39         /** @var array Should be private. Used with addMeta() which adds "<meta>" */
  40         protected $mMetatags = array();
  41
  42         /** @var array */
  43         protected $mLinktags = array();
  44
  45         /** @var bool */
  46         protected $mCanonicalUrl = false;
  47
  48         /**
  49          * @var array Additional stylesheets. Looks like this is for extensions.
  50          *   Might be replaced by resource loader.
  51          */
  52         protected $mExtStyles = array();
  53
  54         /**
  55          * @var string Should be private - has getter and setter. Contains
  56          *   the HTML title */
  57         public $mPagetitle = '';
  58
  59         /**
  60          * @var string Contains all of the "<body>" content. Should be private we
  61          *   got set/get accessors and the append() method.
  62          */
  63         public $mBodytext = '';
  64
  65         /**
  66          * Holds the debug lines that will be output as comments in page source if
  67          * $wgDebugComments is enabled. See also $wgShowDebug.
  68          * @deprecated since 1.20; use MWDebug class instead.
  69          */
  70         public $mDebugtext = '';
  71
  72         /** @var string Stores contents of "<title>" tag */
  73         private $mHTMLtitle = '';
  74
  75         /**
  76          * @var bool Is the displayed content related to the source of the
  77          *   corresponding wiki article.
  78          */
  79         private $mIsarticle = false;
  80
  81         /** @var bool Stores "article flag" toggle. */
  82         private $mIsArticleRelated = true;
  83
  84         /**
  85          * @var bool We have to set isPrintable(). Some pages should
  86          * never be printed (ex: redirections).
  87          */
  88         private $mPrintable = false;
  89
  90         /**
  91          * @var array Contains the page subtitle. Special pages usually have some
  92          *   links here. Don't confuse with site subtitle added by skins.
  93          */
  94         private $mSubtitle = array();
  95
  96         /** @var string */
  97         public $mRedirect = '';
  98
  99         /** @var int */
 100         protected $mStatusCode;
 101
 102         /**
 103          * @var string Variable mLastModified and mEtag are used for sending cache control.
 104          *   The whole caching system should probably be moved into its own class.
 105          */
 106         protected $mLastModified = '';
 107
 108         /**
 109          * Contains an HTTP Entity Tags (see RFC 2616 section 3.13) which is used
 110          * as a unique identifier for the content. It is later used by the client
 111          * to compare its cached version with the server version. Client sends
 112          * headers If-Match and If-None-Match containing its locally cached ETAG value.
 113          *
 114          * To get more information, you will have to look at HTTP/1.1 protocol which
 115          * is properly described in RFC 2616 : http://tools.ietf.org/html/rfc2616
 116          */
 117         private $mETag = false;
 118
 119         /** @var array */
 120         protected $mCategoryLinks = array();
 121
 122         /** @var array */
 123         protected $mCategories = array();
 124
 125         /** @var array Array of Interwiki Prefixed (non DB key) Titles (e.g. 'fr:Test page') */
 126         private $mLanguageLinks = array();
 127
 128         /**
 129          * Used for JavaScript (pre resource loader)
 130          * @todo We should split JS / CSS.
 131          * mScripts content is inserted as is in "<head>" by Skin. This might
 132          * contain either a link to a stylesheet or inline CSS.
 133          */
 134         private $mScripts = '';
 135
 136         /** @var string Inline CSS styles. Use addInlineStyle() sparingly */
 137         protected $mInlineStyles = '';
 138
 139         /** @todo Unused? */
 140         private $mLinkColours;
 141
 142         /**
 143          * @var string Used by skin template.
 144          * Example: $tpl->set( 'displaytitle', $out->mPageLinkTitle );
 145          */
 146         public $mPageLinkTitle = '';
 147
 148         /** @var array Array of elements in "<head>". Parser might add its own headers! */
 149         protected $mHeadItems = array();
 150
 151         // @todo FIXME: Next 5 variables probably come from the resource loader
 152
 153         /** @var array */
 154         protected $mModules = array();
 155
 156         /** @var array */
 157         protected $mModuleScripts = array();
 158
 159         /** @var array */
 160         protected $mModuleStyles = array();
 161
 162         /** @var array */
 163         protected $mModuleMessages = array();
 164
 165         /** @var ResourceLoader */
 166         protected $mResourceLoader;
 167
 168         /** @var array */
 169         protected $mJsConfigVars = array();
 170
 171         /** @var array */
 172         protected $mTemplateIds = array();
 173
 174         /** @var array */
 175         protected $mImageTimeKeys = array();
 176
 177         /** @var string */
 178         public $mRedirectCode = '';
 179
 180         protected $mFeedLinksAppendQuery = null;
 181
 182         /** @var array
 183          * What level of 'untrustworthiness' is allowed in CSS/JS modules loaded on this page?
 184          * @see ResourceLoaderModule::$origin
 185          * ResourceLoaderModule::ORIGIN_ALL is assumed unless overridden;
 186          */
 187         protected $mAllowedModules = array(
 188                 ResourceLoaderModule::TYPE_COMBINED => ResourceLoaderModule::ORIGIN_ALL,
 189         );
 190
 191         /** @var bool Whether output is disabled.  If this is true, the 'output' method will do nothing. */
 192         protected $mDoNothing = false;
 193
 194         // Parser related.
 195
 196         /**
 197          * @var int
 198          * @todo Unused?
 199          */
 200         private $mContainsOldMagic = 0;
 201
 202         /** @var int */
 203         protected $mContainsNewMagic = 0;
 204
 205         /**
 206          * lazy initialised, use parserOptions()
 207          * @var ParserOptions
 208          */
 209         protected $mParserOptions = null;
 210
 211         /**
 212          * Handles the Atom / RSS links.
 213          * We probably only support Atom in 2011.
 214          * @see $wgAdvertisedFeedTypes
 215          */
 216         private $mFeedLinks = array();
 217
 218         // Gwicke work on squid caching? Roughly from 2003.
 219         protected $mEnableClientCache = true;
 220
 221         /** @var bool Flag if output should only contain the body of the article. */
 222         private $mArticleBodyOnly = false;
 223
 224         /** @var bool */
 225         protected $mNewSectionLink = false;
 226
 227         /** @var bool */
 228         protected $mHideNewSectionLink = false;
 229
 230         /**
 231          * @var bool Comes from the parser. This was probably made to load CSS/JS
 232          * only if we had "<gallery>". Used directly in CategoryPage.php.
 233          * Looks like resource loader can replace this.
 234          */
 235         public $mNoGallery = false;
 236
 237         /** @var string */
 238         private $mPageTitleActionText = '';
 239
 240         /** @var array */
 241         private $mParseWarnings = array();
 242
 243         /** @var int Cache stuff. Looks like mEnableClientCache */
 244         protected $mSquidMaxage = 0;
 245
 246         /**
 247          * @var bool
 248          * @todo Document
 249          */
 250         protected $mPreventClickjacking = true;
 251
 252         /** @var int To include the variable {{REVISIONID}} */
 253         private $mRevisionId = null;
 254
 255         /** @var string */
 256         private $mRevisionTimestamp = null;
 257
 258         /** @var array */
 259         protected $mFileVersion = null;
 260
 261         /**
 262          * @var array An array of stylesheet filenames (relative from skins path),
 263          * with options for CSS media, IE conditions, and RTL/LTR direction.
 264          * For internal use; add settings in the skin via $this->addStyle()
 265          *
 266          * Style again! This seems like a code duplication since we already have
 267          * mStyles. This is what makes Open Source amazing.
 268          */
 269         protected $styles = array();
 270
 271         /**
 272          * Whether jQuery is already handled.
 273          */
 274         protected $mJQueryDone = false;
 275
 276         private $mIndexPolicy = 'index';
 277         private $mFollowPolicy = 'follow';
 278         private $mVaryHeader = array(
 279                 'Accept-Encoding' => array( 'list-contains=gzip' ),
 280         );
 281
 282         /**
 283          * If the current page was reached through a redirect, $mRedirectedFrom contains the Title
 284          * of the redirect.
 285          *
 286          * @var Title
 287          */
 288         private $mRedirectedFrom = null;
 289
 290         /**
 291          * Additional key => value data
 292          */
 293         private $mProperties = array();
 294
 295         /**
 296          * @var string|null ResourceLoader target for load.php links. If null, will be omitted
 297          */
 298         private $mTarget = null;
 299
 300         /**
 301          * @var bool Whether parser output should contain table of contents
 302          */
 303         private $mEnableTOC = true;
 304
 305         /**
 306          * @var bool Whether parser output should contain section edit links
 307          */
 308         private $mEnableSectionEditLinks = true;
 309
 310         /**
 311          * Constructor for OutputPage. This should not be called directly.
 312          * Instead a new RequestContext should be created and it will implicitly create
 313          * a OutputPage tied to that context.
 314          * @param IContextSource|null $context
 315          */
 316         function __construct( IContextSource $context = null ) {
 317                 if ( $context === null ) {
 318                         # Extensions should use `new RequestContext` instead of `new OutputPage` now.
 319                         wfDeprecated( __METHOD__, '1.18' );
 320                 } else {
 321                         $this->setContext( $context );
 322                 }
 323         }
 324
 325         /**
 326          * Redirect to $url rather than displaying the normal page
 327          *
 328          * @param string $url URL
 329          * @param string $responsecode HTTP status code
 330          */
 331         public function redirect( $url, $responsecode = '302' ) {
 332                 # Strip newlines as a paranoia check for header injection in PHP<5.1.2
 333                 $this->mRedirect = str_replace( "\n", '', $url );
 334                 $this->mRedirectCode = $responsecode;
 335         }
 336
 337         /**
 338          * Get the URL to redirect to, or an empty string if not redirect URL set
 339          *
 340          * @return string
 341          */
 342         public function getRedirect() {
 343                 return $this->mRedirect;
 344         }
 345
 346         /**
 347          * Set the HTTP status code to send with the output.
 348          *
 349          * @param int $statusCode
 350          */
 351         public function setStatusCode( $statusCode ) {
 352                 $this->mStatusCode = $statusCode;
 353         }
 354
 355         /**
 356          * Add a new "<meta>" tag
 357          * To add an http-equiv meta tag, precede the name with "http:"
 358          *
 359          * @param string $name Tag name
 360          * @param string $val Tag value
 361          */
 362         function addMeta( $name, $val ) {
 363                 array_push( $this->mMetatags, array( $name, $val ) );
 364         }
 365
 366         /**
 367          * Add a new \<link\> tag to the page header.
 368          *
 369          * Note: use setCanonicalUrl() for rel=canonical.
 370          *
 371          * @param array $linkarr Associative array of attributes.
 372          */
 373         function addLink( array $linkarr ) {
 374                 array_push( $this->mLinktags, $linkarr );
 375         }
 376
 377         /**
 378          * Add a new \<link\> with "rel" attribute set to "meta"
 379          *
 380          * @param array $linkarr Associative array mapping attribute names to their
 381          *                 values, both keys and values will be escaped, and the
 382          *                 "rel" attribute will be automatically added
 383          */
 384         function addMetadataLink( array $linkarr ) {
 385                 $linkarr['rel'] = $this->getMetadataAttribute();
 386                 $this->addLink( $linkarr );
 387         }
 388
 389         /**
 390          * Set the URL to be used for the <link rel=canonical>. This should be used
 391          * in preference to addLink(), to avoid duplicate link tags.
 392          * @param string $url
 393          */
 394         function setCanonicalUrl( $url ) {
 395                 $this->mCanonicalUrl = $url;
 396         }
 397
 398         /**
 399          * Get the value of the "rel" attribute for metadata links
 400          *
 401          * @return string
 402          */
 403         public function getMetadataAttribute() {
 404                 # note: buggy CC software only reads first "meta" link
 405                 static $haveMeta = false;
 406                 if ( $haveMeta ) {
 407                         return 'alternate meta';
 408                 } else {
 409                         $haveMeta = true;
 410                         return 'meta';
 411                 }
 412         }
 413
 414         /**
 415          * Add raw HTML to the list of scripts (including \<script\> tag, etc.)
 416          *
 417          * @param string $script Raw HTML
 418          */
 419         function addScript( $script ) {
 420                 $this->mScripts .= $script . "\n";
 421         }
 422
 423         /**
 424          * Register and add a stylesheet from an extension directory.
 425          *
 426          * @param string $url Path to sheet.  Provide either a full url (beginning
 427          *             with 'http', etc) or a relative path from the document root
 428          *             (beginning with '/').  Otherwise it behaves identically to
 429          *             addStyle() and draws from the /skins folder.
 430          */
 431         public function addExtensionStyle( $url ) {
 432                 array_push( $this->mExtStyles, $url );
 433         }
 434
 435         /**
 436          * Get all styles added by extensions
 437          *
 438          * @return array
 439          */
 440         function getExtStyle() {
 441                 return $this->mExtStyles;
 442         }
 443
 444         /**
 445          * Add a JavaScript file out of skins/common, or a given relative path.
 446          *
 447          * @param string $file Filename in skins/common or complete on-server path
 448          *              (/foo/bar.js)
 449          * @param string $version Style version of the file. Defaults to $wgStyleVersion
 450          */
 451         public function addScriptFile( $file, $version = null ) {
 452                 // See if $file parameter is an absolute URL or begins with a slash
 453                 if ( substr( $file, 0, 1 ) == '/' || preg_match( '#^[a-z]*://#i', $file ) ) {
 454                         $path = $file;
 455                 } else {
 456                         $path = $this->getConfig()->get( 'StylePath' ) . "/common/{$file}";
 457                 }
 458                 if ( is_null( $version ) ) {
 459                         $version = $this->getConfig()->get( 'StyleVersion' );
 460                 }
 461                 $this->addScript( Html::linkedScript( wfAppendQuery( $path, $version ) ) );
 462         }
 463
 464         /**
 465          * Add a self-contained script tag with the given contents
 466          *
 467          * @param string $script JavaScript text, no "<script>" tags
 468          */
 469         public function addInlineScript( $script ) {
 470                 $this->mScripts .= Html::inlineScript( "\n$script\n" ) . "\n";
 471         }
 472
 473         /**
 474          * Get all registered JS and CSS tags for the header.
 475          *
 476          * @return string
 477          * @deprecated since 1.24 Use OutputPage::headElement to build the full header.
 478          */
 479         function getScript() {
 480                 wfDeprecated( __METHOD__, '1.24' );
 481                 return $this->mScripts . $this->getHeadItems();
 482         }
 483
 484         /**
 485          * Filter an array of modules to remove insufficiently trustworthy members, and modules
 486          * which are no longer registered (eg a page is cached before an extension is disabled)
 487          * @param array $modules
 488          * @param string|null $position If not null, only return modules with this position
 489          * @param string $type
 490          * @return array
 491          */
 492         protected function filterModules( array $modules, $position = null,
 493                 $type = ResourceLoaderModule::TYPE_COMBINED
 494         ) {
 495                 $resourceLoader = $this->getResourceLoader();
 496                 $filteredModules = array();
 497                 foreach ( $modules as $val ) {
 498                         $module = $resourceLoader->getModule( $val );
 499                         if ( $module instanceof ResourceLoaderModule
 500                                 && $module->getOrigin() <= $this->getAllowedModules( $type )
 501                                 && ( is_null( $position ) || $module->getPosition() == $position )
 502                                 && ( !$this->mTarget || in_array( $this->mTarget, $module->getTargets() ) )
 503                         ) {
 504                                 $filteredModules[] = $val;
 505                         }
 506                 }
 507                 return $filteredModules;
 508         }
 509
 510         /**
 511          * Get the list of modules to include on this page
 512          *
 513          * @param bool $filter Whether to filter out insufficiently trustworthy modules
 514          * @param string|null $position If not null, only return modules with this position
 515          * @param string $param
 516          * @return array Array of module names
 517          */
 518         public function getModules( $filter = false, $position = null, $param = 'mModules' ) {
 519                 $modules = array_values( array_unique( $this->$param ) );
 520                 return $filter
 521                         ? $this->filterModules( $modules, $position )
 522                         : $modules;
 523         }
 524
 525         /**
 526          * Add one or more modules recognized by the resource loader. Modules added
 527          * through this function will be loaded by the resource loader when the
 528          * page loads.
 529          *
 530          * @param string|array $modules Module name (string) or array of module names
 531          */
 532         public function addModules( $modules ) {
 533                 $this->mModules = array_merge( $this->mModules, (array)$modules );
 534         }
 535
 536         /**
 537          * Get the list of module JS to include on this page
 538          *
 539          * @param bool $filter
 540          * @param string|null $position
 541          *
 542          * @return array Array of module names
 543          */
 544         public function getModuleScripts( $filter = false, $position = null ) {
 545                 return $this->getModules( $filter, $position, 'mModuleScripts' );
 546         }
 547
 548         /**
 549          * Add only JS of one or more modules recognized by the resource loader. Module
 550          * scripts added through this function will be loaded by the resource loader when
 551          * the page loads.
 552          *
 553          * @param string|array $modules Module name (string) or array of module names
 554          */
 555         public function addModuleScripts( $modules ) {
 556                 $this->mModuleScripts = array_merge( $this->mModuleScripts, (array)$modules );
 557         }
 558
 559         /**
 560          * Get the list of module CSS to include on this page
 561          *
 562          * @param bool $filter
 563          * @param string|null $position
 564          *
 565          * @return array Array of module names
 566          */
 567         public function getModuleStyles( $filter = false, $position = null ) {
 568                 return $this->getModules( $filter, $position, 'mModuleStyles' );
 569         }
 570
 571         /**
 572          * Add only CSS of one or more modules recognized by the resource loader.
 573          *
 574          * Module styles added through this function will be added using standard link CSS
 575          * tags, rather than as a combined Javascript and CSS package. Thus, they will
 576          * load when JavaScript is disabled (unless CSS also happens to be disabled).
 577          *
 578          * @param string|array $modules Module name (string) or array of module names
 579          */
 580         public function addModuleStyles( $modules ) {
 581                 $this->mModuleStyles = array_merge( $this->mModuleStyles, (array)$modules );
 582         }
 583
 584         /**
 585          * Get the list of module messages to include on this page
 586          *
 587          * @param bool $filter
 588          * @param string|null $position
 589          *
 590          * @return array Array of module names
 591          */
 592         public function getModuleMessages( $filter = false, $position = null ) {
 593                 return $this->getModules( $filter, $position, 'mModuleMessages' );
 594         }
 595
 596         /**
 597          * Add only messages of one or more modules recognized by the resource loader.
 598          * Module messages added through this function will be loaded by the resource
 599          * loader when the page loads.
 600          *
 601          * @param string|array $modules Module name (string) or array of module names
 602          */
 603         public function addModuleMessages( $modules ) {
 604                 $this->mModuleMessages = array_merge( $this->mModuleMessages, (array)$modules );
 605         }
 606
 607         /**
 608          * @return null|string ResourceLoader target
 609          */
 610         public function getTarget() {
 611                 return $this->mTarget;
 612         }
 613
 614         /**
 615          * Sets ResourceLoader target for load.php links. If null, will be omitted
 616          *
 617          * @param string|null $target
 618          */
 619         public function setTarget( $target ) {
 620                 $this->mTarget = $target;
 621         }
 622
 623         /**
 624          * Get an array of head items
 625          *
 626          * @return array
 627          */
 628         function getHeadItemsArray() {
 629                 return $this->mHeadItems;
 630         }
 631
 632         /**
 633          * Get all header items in a string
 634          *
 635          * @return string
 636          * @deprecated since 1.24 Use OutputPage::headElement or
 637          *   if absolutely necessary use OutputPage::getHeadItemsArray
 638          */
 639         function getHeadItems() {
 640                 wfDeprecated( __METHOD__, '1.24' );
 641                 $s = '';
 642                 foreach ( $this->mHeadItems as $item ) {
 643                         $s .= $item;
 644                 }
 645                 return $s;
 646         }
 647
 648         /**
 649          * Add or replace an header item to the output
 650          *
 651          * @param string $name Item name
 652          * @param string $value Raw HTML
 653          */
 654         public function addHeadItem( $name, $value ) {
 655                 $this->mHeadItems[$name] = $value;
 656         }
 657
 658         /**
 659          * Check if the header item $name is already set
 660          *
 661          * @param string $name Item name
 662          * @return bool
 663          */
 664         public function hasHeadItem( $name ) {
 665                 return isset( $this->mHeadItems[$name] );
 666         }
 667
 668         /**
 669          * Set the value of the ETag HTTP header, only used if $wgUseETag is true
 670          *
 671          * @param string $tag Value of "ETag" header
 672          */
 673         function setETag( $tag ) {
 674                 $this->mETag = $tag;
 675         }
 676
 677         /**
 678          * Set whether the output should only contain the body of the article,
 679          * without any skin, sidebar, etc.
 680          * Used e.g. when calling with "action=render".
 681          *
 682          * @param bool $only Whether to output only the body of the article
 683          */
 684         public function setArticleBodyOnly( $only ) {
 685                 $this->mArticleBodyOnly = $only;
 686         }
 687
 688         /**
 689          * Return whether the output will contain only the body of the article
 690          *
 691          * @return bool
 692          */
 693         public function getArticleBodyOnly() {
 694                 return $this->mArticleBodyOnly;
 695         }
 696
 697         /**
 698          * Set an additional output property
 699          * @since 1.21
 700          *
 701          * @param string $name
 702          * @param mixed $value
 703          */
 704         public function setProperty( $name, $value ) {
 705                 $this->mProperties[$name] = $value;
 706         }
 707
 708         /**
 709          * Get an additional output property
 710          * @since 1.21
 711          *
 712          * @param string $name
 713          * @return mixed Property value or null if not found
 714          */
 715         public function getProperty( $name ) {
 716                 if ( isset( $this->mProperties[$name] ) ) {
 717                         return $this->mProperties[$name];
 718                 } else {
 719                         return null;
 720                 }
 721         }
 722
 723         /**
 724          * checkLastModified tells the client to use the client-cached page if
 725          * possible. If successful, the OutputPage is disabled so that
 726          * any future call to OutputPage->output() have no effect.
 727          *
 728          * Side effect: sets mLastModified for Last-Modified header
 729          *
 730          * @param string $timestamp
 731          *
 732          * @return bool True if cache-ok headers was sent.
 733          */
 734         public function checkLastModified( $timestamp ) {
 735                 if ( !$timestamp || $timestamp == '19700101000000' ) {
 736                         wfDebug( __METHOD__ . ": CACHE DISABLED, NO TIMESTAMP\n" );
 737                         return false;
 738                 }
 739                 $config = $this->getConfig();
 740                 if ( !$config->get( 'CachePages' ) ) {
 741                         wfDebug( __METHOD__ . ": CACHE DISABLED\n" );
 742                         return false;
 743                 }
 744
 745                 $timestamp = wfTimestamp( TS_MW, $timestamp );
 746                 $modifiedTimes = array(
 747                         'page' => $timestamp,
 748                         'user' => $this->getUser()->getTouched(),
 749                         'epoch' => $config->get( 'CacheEpoch' )
 750                 );
 751                 if ( $config->get( 'UseSquid' ) ) {
 752                         // bug 44570: the core page itself may not change, but resources might
 753                         $modifiedTimes['sepoch'] = wfTimestamp( TS_MW, time() - $config->get( 'SquidMaxage' ) );
 754                 }
 755                 wfRunHooks( 'OutputPageCheckLastModified', array( &$modifiedTimes ) );
 756
 757                 $maxModified = max( $modifiedTimes );
 758                 $this->mLastModified = wfTimestamp( TS_RFC2822, $maxModified );
 759
 760                 $clientHeader = $this->getRequest()->getHeader( 'If-Modified-Since' );
 761                 if ( $clientHeader === false ) {
 762                         wfDebug( __METHOD__ . ": client did not send If-Modified-Since header\n", 'log' );
 763                         return false;
 764                 }
 765
 766                 # IE sends sizes after the date like this:
 767                 # Wed, 20 Aug 2003 06:51:19 GMT; length=5202
 768                 # this breaks strtotime().
 769                 $clientHeader = preg_replace( '/;.*$/', '', $clientHeader );
 770
 771                 wfSuppressWarnings(); // E_STRICT system time bitching
 772                 $clientHeaderTime = strtotime( $clientHeader );
 773                 wfRestoreWarnings();
 774                 if ( !$clientHeaderTime ) {
 775                         wfDebug( __METHOD__
 776                                 . ": unable to parse the client's If-Modified-Since header: $clientHeader\n" );
 777                         return false;
 778                 }
 779                 $clientHeaderTime = wfTimestamp( TS_MW, $clientHeaderTime );
 780
 781                 # Make debug info
 782                 $info = '';
 783                 foreach ( $modifiedTimes as $name => $value ) {
 784                         if ( $info !== '' ) {
 785                                 $info .= ', ';
 786                         }
 787                         $info .= "$name=" . wfTimestamp( TS_ISO_8601, $value );
 788                 }
 789
 790                 wfDebug( __METHOD__ . ": client sent If-Modified-Since: " .
 791                         wfTimestamp( TS_ISO_8601, $clientHeaderTime ) . "\n", 'log' );
 792                 wfDebug( __METHOD__ . ": effective Last-Modified: " .
 793                         wfTimestamp( TS_ISO_8601, $maxModified ) . "\n", 'log' );
 794                 if ( $clientHeaderTime < $maxModified ) {
 795                         wfDebug( __METHOD__ . ": STALE, $info\n", 'log' );
 796                         return false;
 797                 }
 798
 799                 # Not modified
 800                 # Give a 304 response code and disable body output
 801                 wfDebug( __METHOD__ . ": NOT MODIFIED, $info\n", 'log' );
 802                 ini_set( 'zlib.output_compression', 0 );
 803                 $this->getRequest()->response()->header( "HTTP/1.1 304 Not Modified" );
 804                 $this->sendCacheControl();
 805                 $this->disable();
 806
 807                 // Don't output a compressed blob when using ob_gzhandler;
 808                 // it's technically against HTTP spec and seems to confuse
 809                 // Firefox when the response gets split over two packets.
 810                 wfClearOutputBuffers();
 811
 812                 return true;
 813         }
 814
 815         /**
 816          * Override the last modified timestamp
 817          *
 818          * @param string $timestamp New timestamp, in a format readable by
 819          *        wfTimestamp()
 820          */
 821         public function setLastModified( $timestamp ) {
 822                 $this->mLastModified = wfTimestamp( TS_RFC2822, $timestamp );
 823         }
 824
 825         /**
 826          * Set the robot policy for the page: <http://www.robotstxt.org/meta.html>
 827          *
 828          * @param string $policy The literal string to output as the contents of
 829          *   the meta tag.  Will be parsed according to the spec and output in
 830          *   standardized form.
 831          * @return null
 832          */
 833         public function setRobotPolicy( $policy ) {
 834                 $policy = Article::formatRobotPolicy( $policy );
 835
 836                 if ( isset( $policy['index'] ) ) {
 837                         $this->setIndexPolicy( $policy['index'] );
 838                 }
 839                 if ( isset( $policy['follow'] ) ) {
 840                         $this->setFollowPolicy( $policy['follow'] );
 841                 }
 842         }
 843
 844         /**
 845          * Set the index policy for the page, but leave the follow policy un-
 846          * touched.
 847          *
 848          * @param string $policy Either 'index' or 'noindex'.
 849          * @return null
 850          */
 851         public function setIndexPolicy( $policy ) {
 852                 $policy = trim( $policy );
 853                 if ( in_array( $policy, array( 'index', 'noindex' ) ) ) {
 854                         $this->mIndexPolicy = $policy;
 855                 }
 856         }
 857
 858         /**
 859          * Set the follow policy for the page, but leave the index policy un-
 860          * touched.
 861          *
 862          * @param string $policy Either 'follow' or 'nofollow'.
 863          * @return null
 864          */
 865         public function setFollowPolicy( $policy ) {
 866                 $policy = trim( $policy );
 867                 if ( in_array( $policy, array( 'follow', 'nofollow' ) ) ) {
 868                         $this->mFollowPolicy = $policy;
 869                 }
 870         }
 871
 872         /**
 873          * Set the new value of the "action text", this will be added to the
 874          * "HTML title", separated from it with " - ".
 875          *
 876          * @param string $text New value of the "action text"
 877          */
 878         public function setPageTitleActionText( $text ) {
 879                 $this->mPageTitleActionText = $text;
 880         }
 881
 882         /**
 883          * Get the value of the "action text"
 884          *
 885          * @return string
 886          */
 887         public function getPageTitleActionText() {
 888                 return $this->mPageTitleActionText;
 889         }
 890
 891         /**
 892          * "HTML title" means the contents of "<title>".
 893          * It is stored as plain, unescaped text and will be run through htmlspecialchars in the skin file.
 894          *
 895          * @param string|Message $name
 896          */
 897         public function setHTMLTitle( $name ) {
 898                 if ( $name instanceof Message ) {
 899                         $this->mHTMLtitle = $name->setContext( $this->getContext() )->text();
 900                 } else {
 901                         $this->mHTMLtitle = $name;
 902                 }
 903         }
 904
 905         /**
 906          * Return the "HTML title", i.e. the content of the "<title>" tag.
 907          *
 908          * @return string
 909          */
 910         public function getHTMLTitle() {
 911                 return $this->mHTMLtitle;
 912         }
 913
 914         /**
 915          * Set $mRedirectedFrom, the Title of the page which redirected us to the current page.
 916          *
 917          * @param Title $t
 918          */
 919         public function setRedirectedFrom( $t ) {
 920                 $this->mRedirectedFrom = $t;
 921         }
 922
 923         /**
 924          * "Page title" means the contents of \<h1\>. It is stored as a valid HTML
 925          * fragment. This function allows good tags like \<sup\> in the \<h1\> tag,
 926          * but not bad tags like \<script\>. This function automatically sets
 927          * \<title\> to the same content as \<h1\> but with all tags removed. Bad
 928          * tags that were escaped in \<h1\> will still be escaped in \<title\>, and
 929          * good tags like \<i\> will be dropped entirely.
 930          *
 931          * @param string|Message $name
 932          */
 933         public function setPageTitle( $name ) {
 934                 if ( $name instanceof Message ) {
 935                         $name = $name->setContext( $this->getContext() )->text();
 936                 }
 937
 938                 # change "<script>foo&bar</script>" to "&lt;script&gt;foo&amp;bar&lt;/script&gt;"
 939                 # but leave "<i>foobar</i>" alone
 940                 $nameWithTags = Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags( $name ) );
 941                 $this->mPagetitle = $nameWithTags;
 942
 943                 # change "<i>foo&amp;bar</i>" to "foo&bar"
 944                 $this->setHTMLTitle(
 945                         $this->msg( 'pagetitle' )->rawParams( Sanitizer::stripAllTags( $nameWithTags ) )
 946                                 ->inContentLanguage()
 947                 );
 948         }
 949
 950         /**
 951          * Return the "page title", i.e. the content of the \<h1\> tag.
 952          *
 953          * @return string
 954          */
 955         public function getPageTitle() {
 956                 return $this->mPagetitle;
 957         }
 958
 959         /**
 960          * Set the Title object to use
 961          *
 962          * @param Title $t
 963          */
 964         public function setTitle( Title $t ) {
 965                 $this->getContext()->setTitle( $t );
 966         }
 967
 968         /**
 969          * Replace the subtitle with $str
 970          *
 971          * @param string|Message $str New value of the subtitle. String should be safe HTML.
 972          */
 973         public function setSubtitle( $str ) {
 974                 $this->clearSubtitle();
 975                 $this->addSubtitle( $str );
 976         }
 977
 978         /**
 979          * Add $str to the subtitle
 980          *
 981          * @deprecated since 1.19; use addSubtitle() instead
 982          * @param string|Message $str String or Message to add to the subtitle
 983          */
 984         public function appendSubtitle( $str ) {
 985                 $this->addSubtitle( $str );
 986         }
 987
 988         /**
 989          * Add $str to the subtitle
 990          *
 991          * @param string|Message $str String or Message to add to the subtitle. String should be safe HTML.
 992          */
 993         public function addSubtitle( $str ) {
 994                 if ( $str instanceof Message ) {
 995                         $this->mSubtitle[] = $str->setContext( $this->getContext() )->parse();
 996                 } else {
 997                         $this->mSubtitle[] = $str;
 998                 }
 999         }
1000
1001         /**
1002          * Add a subtitle containing a backlink to a page
1003          *
1004          * @param Title $title Title to link to
1005          * @param array $query Array of additional parameters to include in the link
1006          */
1007         public function addBacklinkSubtitle( Title $title, $query = array() ) {
1008                 if ( $title->isRedirect() ) {
1009                         $query['redirect'] = 'no';
1010                 }
1011                 $this->addSubtitle( $this->msg( 'backlinksubtitle' )
1012                         ->rawParams( Linker::link( $title, null, array(), $query ) ) );
1013         }
1014
1015         /**
1016          * Clear the subtitles
1017          */
1018         public function clearSubtitle() {
1019                 $this->mSubtitle = array();
1020         }
1021
1022         /**
1023          * Get the subtitle
1024          *
1025          * @return string
1026          */
1027         public function getSubtitle() {
1028                 return implode( "<br />\n\t\t\t\t", $this->mSubtitle );
1029         }
1030
1031         /**
1032          * Set the page as printable, i.e. it'll be displayed with with all
1033          * print styles included
1034          */
1035         public function setPrintable() {
1036                 $this->mPrintable = true;
1037         }
1038
1039         /**
1040          * Return whether the page is "printable"
1041          *
1042          * @return bool
1043          */
1044         public function isPrintable() {
1045                 return $this->mPrintable;
1046         }
1047
1048         /**
1049          * Disable output completely, i.e. calling output() will have no effect
1050          */
1051         public function disable() {
1052                 $this->mDoNothing = true;
1053         }
1054
1055         /**
1056          * Return whether the output will be completely disabled
1057          *
1058          * @return bool
1059          */
1060         public function isDisabled() {
1061                 return $this->mDoNothing;
1062         }
1063
1064         /**
1065          * Show an "add new section" link?
1066          *
1067          * @return bool
1068          */
1069         public function showNewSectionLink() {
1070                 return $this->mNewSectionLink;
1071         }
1072
1073         /**
1074          * Forcibly hide the new section link?
1075          *
1076          * @return bool
1077          */
1078         public function forceHideNewSectionLink() {
1079                 return $this->mHideNewSectionLink;
1080         }
1081
1082         /**
1083          * Add or remove feed links in the page header
1084          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
1085          * for the new version
1086          * @see addFeedLink()
1087          *
1088          * @param bool $show True: add default feeds, false: remove all feeds
1089          */
1090         public function setSyndicated( $show = true ) {
1091                 if ( $show ) {
1092                         $this->setFeedAppendQuery( false );
1093                 } else {
1094                         $this->mFeedLinks = array();
1095                 }
1096         }
1097
1098         /**
1099          * Add default feeds to the page header
1100          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
1101          * for the new version
1102          * @see addFeedLink()
1103          *
1104          * @param string $val Query to append to feed links or false to output
1105          *        default links
1106          */
1107         public function setFeedAppendQuery( $val ) {
1108                 $this->mFeedLinks = array();
1109
1110                 foreach ( $this->getConfig()->get( 'AdvertisedFeedTypes' ) as $type ) {
1111                         $query = "feed=$type";
1112                         if ( is_string( $val ) ) {
1113                                 $query .= '&' . $val;
1114                         }
1115                         $this->mFeedLinks[$type] = $this->getTitle()->getLocalURL( $query );
1116                 }
1117         }
1118
1119         /**
1120          * Add a feed link to the page header
1121          *
1122          * @param string $format Feed type, should be a key of $wgFeedClasses
1123          * @param string $href URL
1124          */
1125         public function addFeedLink( $format, $href ) {
1126                 if ( in_array( $format, $this->getConfig()->get( 'AdvertisedFeedTypes' ) ) ) {
1127                         $this->mFeedLinks[$format] = $href;
1128                 }
1129         }
1130
1131         /**
1132          * Should we output feed links for this page?
1133          * @return bool
1134          */
1135         public function isSyndicated() {
1136                 return count( $this->mFeedLinks ) > 0;
1137         }
1138
1139         /**
1140          * Return URLs for each supported syndication format for this page.
1141          * @return array Associating format keys with URLs
1142          */
1143         public function getSyndicationLinks() {
1144                 return $this->mFeedLinks;
1145         }
1146
1147         /**
1148          * Will currently always return null
1149          *
1150          * @return null
1151          */
1152         public function getFeedAppendQuery() {
1153                 return $this->mFeedLinksAppendQuery;
1154         }
1155
1156         /**
1157          * Set whether the displayed content is related to the source of the
1158          * corresponding article on the wiki
1159          * Setting true will cause the change "article related" toggle to true
1160          *
1161          * @param bool $v
1162          */
1163         public function setArticleFlag( $v ) {
1164                 $this->mIsarticle = $v;
1165                 if ( $v ) {
1166                         $this->mIsArticleRelated = $v;
1167                 }
1168         }
1169
1170         /**
1171          * Return whether the content displayed page is related to the source of
1172          * the corresponding article on the wiki
1173          *
1174          * @return bool
1175          */
1176         public function isArticle() {
1177                 return $this->mIsarticle;
1178         }
1179
1180         /**
1181          * Set whether this page is related an article on the wiki
1182          * Setting false will cause the change of "article flag" toggle to false
1183          *
1184          * @param bool $v
1185          */
1186         public function setArticleRelated( $v ) {
1187                 $this->mIsArticleRelated = $v;
1188                 if ( !$v ) {
1189                         $this->mIsarticle = false;
1190                 }
1191         }
1192
1193         /**
1194          * Return whether this page is related an article on the wiki
1195          *
1196          * @return bool
1197          */
1198         public function isArticleRelated() {
1199                 return $this->mIsArticleRelated;
1200         }
1201
1202         /**
1203          * Add new language links
1204          *
1205          * @param array $newLinkArray Associative array mapping language code to the page
1206          *                      name
1207          */
1208         public function addLanguageLinks( array $newLinkArray ) {
1209                 $this->mLanguageLinks += $newLinkArray;
1210         }
1211
1212         /**
1213          * Reset the language links and add new language links
1214          *
1215          * @param array $newLinkArray Associative array mapping language code to the page
1216          *                      name
1217          */
1218         public function setLanguageLinks( array $newLinkArray ) {
1219                 $this->mLanguageLinks = $newLinkArray;
1220         }
1221
1222         /**
1223          * Get the list of language links
1224          *
1225          * @return array Array of Interwiki Prefixed (non DB key) Titles (e.g. 'fr:Test page')
1226          */
1227         public function getLanguageLinks() {
1228                 return $this->mLanguageLinks;
1229         }
1230
1231         /**
1232          * Add an array of categories, with names in the keys
1233          *
1234          * @param array $categories Mapping category name => sort key
1235          */
1236         public function addCategoryLinks( array $categories ) {
1237                 global $wgContLang;
1238
1239                 if ( !is_array( $categories ) || count( $categories ) == 0 ) {
1240                         return;
1241                 }
1242
1243                 # Add the links to a LinkBatch
1244                 $arr = array( NS_CATEGORY => $categories );
1245                 $lb = new LinkBatch;
1246                 $lb->setArray( $arr );
1247
1248                 # Fetch existence plus the hiddencat property
1249                 $dbr = wfGetDB( DB_SLAVE );
1250                 $fields = array( 'page_id', 'page_namespace', 'page_title', 'page_len',
1251                         'page_is_redirect', 'page_latest', 'pp_value' );
1252
1253                 if ( $this->getConfig()->get( 'ContentHandlerUseDB' ) ) {
1254                         $fields[] = 'page_content_model';
1255                 }
1256
1257                 $res = $dbr->select( array( 'page', 'page_props' ),
1258                         $fields,
1259                         $lb->constructSet( 'page', $dbr ),
1260                         __METHOD__,
1261                         array(),
1262                         array( 'page_props' => array( 'LEFT JOIN', array(
1263                                 'pp_propname' => 'hiddencat',
1264                                 'pp_page = page_id'
1265                         ) ) )
1266                 );
1267
1268                 # Add the results to the link cache
1269                 $lb->addResultToCache( LinkCache::singleton(), $res );
1270
1271                 # Set all the values to 'normal'.
1272                 $categories = array_fill_keys( array_keys( $categories ), 'normal' );
1273
1274                 # Mark hidden categories
1275                 foreach ( $res as $row ) {
1276                         if ( isset( $row->pp_value ) ) {
1277                                 $categories[$row->page_title] = 'hidden';
1278                         }
1279                 }
1280
1281                 # Add the remaining categories to the skin
1282                 if ( wfRunHooks(
1283                         'OutputPageMakeCategoryLinks',
1284                         array( &$this, $categories, &$this->mCategoryLinks ) )
1285                 ) {
1286                         foreach ( $categories as $category => $type ) {
1287                                 $origcategory = $category;
1288                                 $title = Title::makeTitleSafe( NS_CATEGORY, $category );
1289                                 if ( !$title ) {
1290                                         continue;
1291                                 }
1292                                 $wgContLang->findVariantLink( $category, $title, true );
1293                                 if ( $category != $origcategory && array_key_exists( $category, $categories ) ) {
1294                                         continue;
1295                                 }
1296                                 $text = $wgContLang->convertHtml( $title->getText() );
1297                                 $this->mCategories[] = $title->getText();
1298                                 $this->mCategoryLinks[$type][] = Linker::link( $title, $text );
1299                         }
1300                 }
1301         }
1302
1303         /**
1304          * Reset the category links (but not the category list) and add $categories
1305          *
1306          * @param array $categories Mapping category name => sort key
1307          */
1308         public function setCategoryLinks( array $categories ) {
1309                 $this->mCategoryLinks = array();
1310                 $this->addCategoryLinks( $categories );
1311         }
1312
1313         /**
1314          * Get the list of category links, in a 2-D array with the following format:
1315          * $arr[$type][] = $link, where $type is either "normal" or "hidden" (for
1316          * hidden categories) and $link a HTML fragment with a link to the category
1317          * page
1318          *
1319          * @return array
1320          */
1321         public function getCategoryLinks() {
1322                 return $this->mCategoryLinks;
1323         }
1324
1325         /**
1326          * Get the list of category names this page belongs to
1327          *
1328          * @return array Array of strings
1329          */
1330         public function getCategories() {
1331                 return $this->mCategories;
1332         }
1333
1334         /**
1335          * Do not allow scripts which can be modified by wiki users to load on this page;
1336          * only allow scripts bundled with, or generated by, the software.
1337          */
1338         public function disallowUserJs() {
1339                 $this->reduceAllowedModules(
1340                         ResourceLoaderModule::TYPE_SCRIPTS,
1341                         ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL
1342                 );
1343         }
1344
1345         /**
1346          * Show what level of JavaScript / CSS untrustworthiness is allowed on this page
1347          * @see ResourceLoaderModule::$origin
1348          * @param string $type ResourceLoaderModule TYPE_ constant
1349          * @return int ResourceLoaderModule ORIGIN_ class constant
1350          */
1351         public function getAllowedModules( $type ) {
1352                 if ( $type == ResourceLoaderModule::TYPE_COMBINED ) {
1353                         return min( array_values( $this->mAllowedModules ) );
1354                 } else {
1355                         return isset( $this->mAllowedModules[$type] )
1356                                 ? $this->mAllowedModules[$type]
1357                                 : ResourceLoaderModule::ORIGIN_ALL;
1358                 }
1359         }
1360
1361         /**
1362          * Set the highest level of CSS/JS untrustworthiness allowed
1363          * @param string $type ResourceLoaderModule TYPE_ constant
1364          * @param int $level ResourceLoaderModule class constant
1365          */
1366         public function setAllowedModules( $type, $level ) {
1367                 $this->mAllowedModules[$type] = $level;
1368         }
1369
1370         /**
1371          * As for setAllowedModules(), but don't inadvertently make the page more accessible
1372          * @param string $type
1373          * @param int $level ResourceLoaderModule class constant
1374          */
1375         public function reduceAllowedModules( $type, $level ) {
1376                 $this->mAllowedModules[$type] = min( $this->getAllowedModules( $type ), $level );
1377         }
1378
1379         /**
1380          * Prepend $text to the body HTML
1381          *
1382          * @param string $text HTML
1383          */
1384         public function prependHTML( $text ) {
1385                 $this->mBodytext = $text . $this->mBodytext;
1386         }
1387
1388         /**
1389          * Append $text to the body HTML
1390          *
1391          * @param string $text HTML
1392          */
1393         public function addHTML( $text ) {
1394                 $this->mBodytext .= $text;
1395         }
1396
1397         /**
1398          * Shortcut for adding an Html::element via addHTML.
1399          *
1400          * @since 1.19
1401          *
1402          * @param string $element
1403          * @param array $attribs
1404          * @param string $contents
1405          */
1406         public function addElement( $element, array $attribs = array(), $contents = '' ) {
1407                 $this->addHTML( Html::element( $element, $attribs, $contents ) );
1408         }
1409
1410         /**
1411          * Clear the body HTML
1412          */
1413         public function clearHTML() {
1414                 $this->mBodytext = '';
1415         }
1416
1417         /**
1418          * Get the body HTML
1419          *
1420          * @return string HTML
1421          */
1422         public function getHTML() {
1423                 return $this->mBodytext;
1424         }
1425
1426         /**
1427          * Get/set the ParserOptions object to use for wikitext parsing
1428          *
1429          * @param ParserOptions|null $options Either the ParserOption to use or null to only get the
1430          *   current ParserOption object
1431          * @return ParserOptions
1432          */
1433         public function parserOptions( $options = null ) {
1434                 if ( !$this->mParserOptions ) {
1435                         $this->mParserOptions = ParserOptions::newFromContext( $this->getContext() );
1436                         $this->mParserOptions->setEditSection( false );
1437                 }
1438                 return wfSetVar( $this->mParserOptions, $options );
1439         }
1440
1441         /**
1442          * Set the revision ID which will be seen by the wiki text parser
1443          * for things such as embedded {{REVISIONID}} variable use.
1444          *
1445          * @param int|null $revid An positive integer, or null
1446          * @return mixed Previous value
1447          */
1448         public function setRevisionId( $revid ) {
1449                 $val = is_null( $revid ) ? null : intval( $revid );
1450                 return wfSetVar( $this->mRevisionId, $val );
1451         }
1452
1453         /**
1454          * Get the displayed revision ID
1455          *
1456          * @return int
1457          */
1458         public function getRevisionId() {
1459                 return $this->mRevisionId;
1460         }
1461
1462         /**
1463          * Set the timestamp of the revision which will be displayed. This is used
1464          * to avoid a extra DB call in Skin::lastModified().
1465          *
1466          * @param string|null $timestamp
1467          * @return mixed Previous value
1468          */
1469         public function setRevisionTimestamp( $timestamp ) {
1470                 return wfSetVar( $this->mRevisionTimestamp, $timestamp );
1471         }
1472
1473         /**
1474          * Get the timestamp of displayed revision.
1475          * This will be null if not filled by setRevisionTimestamp().
1476          *
1477          * @return string|null
1478          */
1479         public function getRevisionTimestamp() {
1480                 return $this->mRevisionTimestamp;
1481         }
1482
1483         /**
1484          * Set the displayed file version
1485          *
1486          * @param File|bool $file
1487          * @return mixed Previous value
1488          */
1489         public function setFileVersion( $file ) {
1490                 $val = null;
1491                 if ( $file instanceof File && $file->exists() ) {
1492                         $val = array( 'time' => $file->getTimestamp(), 'sha1' => $file->getSha1() );
1493                 }
1494                 return wfSetVar( $this->mFileVersion, $val, true );
1495         }
1496
1497         /**
1498          * Get the displayed file version
1499          *
1500          * @return array|null ('time' => MW timestamp, 'sha1' => sha1)
1501          */
1502         public function getFileVersion() {
1503                 return $this->mFileVersion;
1504         }
1505
1506         /**
1507          * Get the templates used on this page
1508          *
1509          * @return array (namespace => dbKey => revId)
1510          * @since 1.18
1511          */
1512         public function getTemplateIds() {
1513                 return $this->mTemplateIds;
1514         }
1515
1516         /**
1517          * Get the files used on this page
1518          *
1519          * @return array (dbKey => array('time' => MW timestamp or null, 'sha1' => sha1 or ''))
1520          * @since 1.18
1521          */
1522         public function getFileSearchOptions() {
1523                 return $this->mImageTimeKeys;
1524         }
1525
1526         /**
1527          * Convert wikitext to HTML and add it to the buffer
1528          * Default assumes that the current page title will be used.
1529          *
1530          * @param string $text
1531          * @param bool $linestart Is this the start of a line?
1532          * @param bool $interface Is this text in the user interface language?
1533          */
1534         public function addWikiText( $text, $linestart = true, $interface = true ) {
1535                 $title = $this->getTitle(); // Work around E_STRICT
1536                 if ( !$title ) {
1537                         throw new MWException( 'Title is null' );
1538                 }
1539                 $this->addWikiTextTitle( $text, $title, $linestart, /*tidy*/false, $interface );
1540         }
1541
1542         /**
1543          * Add wikitext with a custom Title object
1544          *
1545          * @param string $text Wikitext
1546          * @param Title $title
1547          * @param bool $linestart Is this the start of a line?
1548          */
1549         public function addWikiTextWithTitle( $text, &$title, $linestart = true ) {
1550                 $this->addWikiTextTitle( $text, $title, $linestart );
1551         }
1552
1553         /**
1554          * Add wikitext with a custom Title object and tidy enabled.
1555          *
1556          * @param string $text Wikitext
1557          * @param Title $title
1558          * @param bool $linestart Is this the start of a line?
1559          */
1560         function addWikiTextTitleTidy( $text, &$title, $linestart = true ) {
1561                 $this->addWikiTextTitle( $text, $title, $linestart, true );
1562         }
1563
1564         /**
1565          * Add wikitext with tidy enabled
1566          *
1567          * @param string $text Wikitext
1568          * @param bool $linestart Is this the start of a line?
1569          */
1570         public function addWikiTextTidy( $text, $linestart = true ) {
1571                 $title = $this->getTitle();
1572                 $this->addWikiTextTitleTidy( $text, $title, $linestart );
1573         }
1574
1575         /**
1576          * Add wikitext with a custom Title object
1577          *
1578          * @param string $text Wikitext
1579          * @param Title $title
1580          * @param bool $linestart Is this the start of a line?
1581          * @param bool $tidy Whether to use tidy
1582          * @param bool $interface Whether it is an interface message
1583          *   (for example disables conversion)
1584          */
1585         public function addWikiTextTitle( $text, Title $title, $linestart,
1586                 $tidy = false, $interface = false
1587         ) {
1588                 global $wgParser;
1589
1590                 wfProfileIn( __METHOD__ );
1591
1592                 $popts = $this->parserOptions();
1593                 $oldTidy = $popts->setTidy( $tidy );
1594                 $popts->setInterfaceMessage( (bool)$interface );
1595
1596                 $parserOutput = $wgParser->getFreshParser()->parse(
1597                         $text, $title, $popts,
1598                         $linestart, true, $this->mRevisionId
1599                 );
1600
1601                 $popts->setTidy( $oldTidy );
1602
1603                 $this->addParserOutput( $parserOutput );
1604
1605                 wfProfileOut( __METHOD__ );
1606         }
1607
1608         /**
1609          * Add a ParserOutput object, but without Html.
1610          *
1611          * @deprecated since 1.24, use addParserOutputMetadata() instead.
1612          * @param ParserOutput $parserOutput
1613          */
1614         public function addParserOutputNoText( $parserOutput ) {
1615                 $this->addParserOutputMetadata( $parserOutput );
1616         }
1617
1618         /**
1619          * Add all metadata associated with a ParserOutput object, but without the actual HTML. This
1620          * includes categories, language links, ResourceLoader modules, effects of certain magic words,
1621          * and so on.
1622          *
1623          * @since 1.24
1624          * @param ParserOutput $parserOutput
1625          */
1626         public function addParserOutputMetadata( $parserOutput ) {
1627                 $this->mLanguageLinks += $parserOutput->getLanguageLinks();
1628                 $this->addCategoryLinks( $parserOutput->getCategories() );
1629                 $this->mNewSectionLink = $parserOutput->getNewSection();
1630                 $this->mHideNewSectionLink = $parserOutput->getHideNewSection();
1631
1632                 $this->mParseWarnings = $parserOutput->getWarnings();
1633                 if ( !$parserOutput->isCacheable() ) {
1634                         $this->enableClientCache( false );
1635                 }
1636                 $this->mNoGallery = $parserOutput->getNoGallery();
1637                 $this->mHeadItems = array_merge( $this->mHeadItems, $parserOutput->getHeadItems() );
1638                 $this->addModules( $parserOutput->getModules() );
1639                 $this->addModuleScripts( $parserOutput->getModuleScripts() );
1640                 $this->addModuleStyles( $parserOutput->getModuleStyles() );
1641                 $this->addModuleMessages( $parserOutput->getModuleMessages() );
1642                 $this->addJsConfigVars( $parserOutput->getJsConfigVars() );
1643                 $this->mPreventClickjacking = $this->mPreventClickjacking
1644                         || $parserOutput->preventClickjacking();
1645
1646                 // Template versioning...
1647                 foreach ( (array)$parserOutput->getTemplateIds() as $ns => $dbks ) {
1648                         if ( isset( $this->mTemplateIds[$ns] ) ) {
1649                                 $this->mTemplateIds[$ns] = $dbks + $this->mTemplateIds[$ns];
1650                         } else {
1651                                 $this->mTemplateIds[$ns] = $dbks;
1652                         }
1653                 }
1654                 // File versioning...
1655                 foreach ( (array)$parserOutput->getFileSearchOptions() as $dbk => $data ) {
1656                         $this->mImageTimeKeys[$dbk] = $data;
1657                 }
1658
1659                 // Hooks registered in the object
1660                 $parserOutputHooks = $this->getConfig()->get( 'ParserOutputHooks' );
1661                 foreach ( $parserOutput->getOutputHooks() as $hookInfo ) {
1662                         list( $hookName, $data ) = $hookInfo;
1663                         if ( isset( $parserOutputHooks[$hookName] ) ) {
1664                                 call_user_func( $parserOutputHooks[$hookName], $this, $parserOutput, $data );
1665                         }
1666                 }
1667
1668                 // Link flags are ignored for now, but may in the future be
1669                 // used to mark individual language links.
1670                 $linkFlags = array();
1671                 wfRunHooks( 'LanguageLinks', array( $this->getTitle(), &$this->mLanguageLinks, &$linkFlags ) );
1672                 wfRunHooks( 'OutputPageParserOutput', array( &$this, $parserOutput ) );
1673         }
1674
1675         /**
1676          * Add the HTML and enhancements for it (like ResourceLoader modules) associated with a
1677          * ParserOutput object, without any other metadata.
1678          *
1679          * @since 1.24
1680          * @param ParserOutput $parserOutput
1681          */
1682         public function addParserOutputContent( $parserOutput ) {
1683                 $this->addParserOutputText( $parserOutput );
1684
1685                 $this->addModules( $parserOutput->getModules() );
1686                 $this->addModuleScripts( $parserOutput->getModuleScripts() );
1687                 $this->addModuleStyles( $parserOutput->getModuleStyles() );
1688                 $this->addModuleMessages( $parserOutput->getModuleMessages() );
1689
1690                 $this->addJsConfigVars( $parserOutput->getJsConfigVars() );
1691         }
1692
1693         /**
1694          * Add the HTML associated with a ParserOutput object, without any metadata.
1695          *
1696          * @since 1.24
1697          * @param ParserOutput $parserOutput
1698          */
1699         public function addParserOutputText( $parserOutput ) {
1700                 $text = $parserOutput->getText();
1701                 wfRunHooks( 'OutputPageBeforeHTML', array( &$this, &$text ) );
1702                 $this->addHTML( $text );
1703         }
1704
1705         /**
1706          * Add everything from a ParserOutput object.
1707          *
1708          * @param ParserOutput $parserOutput
1709          */
1710         function addParserOutput( $parserOutput ) {
1711                 $this->addParserOutputMetadata( $parserOutput );
1712                 $parserOutput->setTOCEnabled( $this->mEnableTOC );
1713
1714                 // Touch section edit links only if not previously disabled
1715                 if ( $parserOutput->getEditSectionTokens() ) {
1716                         $parserOutput->setEditSectionTokens( $this->mEnableSectionEditLinks );
1717                 }
1718
1719                 $this->addParserOutputText( $parserOutput );
1720         }
1721
1722         /**
1723          * Add the output of a QuickTemplate to the output buffer
1724          *
1725          * @param QuickTemplate $template
1726          */
1727         public function addTemplate( &$template ) {
1728                 $this->addHTML( $template->getHTML() );
1729         }
1730
1731         /**
1732          * Parse wikitext and return the HTML.
1733          *
1734          * @param string $text
1735          * @param bool $linestart Is this the start of a line?
1736          * @param bool $interface Use interface language ($wgLang instead of
1737          *   $wgContLang) while parsing language sensitive magic words like GRAMMAR and PLURAL.
1738          *   This also disables LanguageConverter.
1739          * @param Language $language Target language object, will override $interface
1740          * @throws MWException
1741          * @return string HTML
1742          */
1743         public function parse( $text, $linestart = true, $interface = false, $language = null ) {
1744                 global $wgParser;
1745
1746                 if ( is_null( $this->getTitle() ) ) {
1747                         throw new MWException( 'Empty $mTitle in ' . __METHOD__ );
1748                 }
1749
1750                 $popts = $this->parserOptions();
1751                 if ( $interface ) {
1752                         $popts->setInterfaceMessage( true );
1753                 }
1754                 if ( $language !== null ) {
1755                         $oldLang = $popts->setTargetLanguage( $language );
1756                 }
1757
1758                 $parserOutput = $wgParser->getFreshParser()->parse(
1759                         $text, $this->getTitle(), $popts,
1760                         $linestart, true, $this->mRevisionId
1761                 );
1762
1763                 if ( $interface ) {
1764                         $popts->setInterfaceMessage( false );
1765                 }
1766                 if ( $language !== null ) {
1767                         $popts->setTargetLanguage( $oldLang );
1768                 }
1769
1770                 return $parserOutput->getText();
1771         }
1772
1773         /**
1774          * Parse wikitext, strip paragraphs, and return the HTML.
1775          *
1776          * @param string $text
1777          * @param bool $linestart Is this the start of a line?
1778          * @param bool $interface Use interface language ($wgLang instead of
1779          *   $wgContLang) while parsing language sensitive magic
1780          *   words like GRAMMAR and PLURAL
1781          * @return string HTML
1782          */
1783         public function parseInline( $text, $linestart = true, $interface = false ) {
1784                 $parsed = $this->parse( $text, $linestart, $interface );
1785                 return Parser::stripOuterParagraph( $parsed );
1786         }
1787
1788         /**
1789          * Set the value of the "s-maxage" part of the "Cache-control" HTTP header
1790          *
1791          * @param int $maxage Maximum cache time on the Squid, in seconds.
1792          */
1793         public function setSquidMaxage( $maxage ) {
1794                 $this->mSquidMaxage = $maxage;
1795         }
1796
1797         /**
1798          * Use enableClientCache(false) to force it to send nocache headers
1799          *
1800          * @param bool $state
1801          *
1802          * @return bool
1803          */
1804         public function enableClientCache( $state ) {
1805                 return wfSetVar( $this->mEnableClientCache, $state );
1806         }
1807
1808         /**
1809          * Get the list of cookies that will influence on the cache
1810          *
1811          * @return array
1812          */
1813         function getCacheVaryCookies() {
1814                 static $cookies;
1815                 if ( $cookies === null ) {
1816                         $config = $this->getConfig();
1817                         $cookies = array_merge(
1818                                 array(
1819                                         $config->get( 'CookiePrefix' ) . 'Token',
1820                                         $config->get( 'CookiePrefix' ) . 'LoggedOut',
1821                                         "forceHTTPS",
1822                                         session_name()
1823                                 ),
1824                                 $config->get( 'CacheVaryCookies' )
1825                         );
1826                         wfRunHooks( 'GetCacheVaryCookies', array( $this, &$cookies ) );
1827                 }
1828                 return $cookies;
1829         }
1830
1831         /**
1832          * Check if the request has a cache-varying cookie header
1833          * If it does, it's very important that we don't allow public caching
1834          *
1835          * @return bool
1836          */
1837         function haveCacheVaryCookies() {
1838                 $cookieHeader = $this->getRequest()->getHeader( 'cookie' );
1839                 if ( $cookieHeader === false ) {
1840                         return false;
1841                 }
1842                 $cvCookies = $this->getCacheVaryCookies();
1843                 foreach ( $cvCookies as $cookieName ) {
1844                         # Check for a simple string match, like the way squid does it
1845                         if ( strpos( $cookieHeader, $cookieName ) !== false ) {
1846                                 wfDebug( __METHOD__ . ": found $cookieName\n" );
1847                                 return true;
1848                         }
1849                 }
1850                 wfDebug( __METHOD__ . ": no cache-varying cookies found\n" );
1851                 return false;
1852         }
1853
1854         /**
1855          * Add an HTTP header that will influence on the cache
1856          *
1857          * @param string $header Header name
1858          * @param array|null $option
1859          * @todo FIXME: Document the $option parameter; it appears to be for
1860          *        X-Vary-Options but what format is acceptable?
1861          */
1862         public function addVaryHeader( $header, $option = null ) {
1863                 if ( !array_key_exists( $header, $this->mVaryHeader ) ) {
1864                         $this->mVaryHeader[$header] = (array)$option;
1865                 } elseif ( is_array( $option ) ) {
1866                         if ( is_array( $this->mVaryHeader[$header] ) ) {
1867                                 $this->mVaryHeader[$header] = array_merge( $this->mVaryHeader[$header], $option );
1868                         } else {
1869                                 $this->mVaryHeader[$header] = $option;
1870                         }
1871                 }
1872                 $this->mVaryHeader[$header] = array_unique( (array)$this->mVaryHeader[$header] );
1873         }
1874
1875         /**
1876          * Return a Vary: header on which to vary caches. Based on the keys of $mVaryHeader,
1877          * such as Accept-Encoding or Cookie
1878          *
1879          * @return string
1880          */
1881         public function getVaryHeader() {
1882                 return 'Vary: ' . join( ', ', array_keys( $this->mVaryHeader ) );
1883         }
1884
1885         /**
1886          * Get a complete X-Vary-Options header
1887          *
1888          * @return string
1889          */
1890         public function getXVO() {
1891                 $cvCookies = $this->getCacheVaryCookies();
1892
1893                 $cookiesOption = array();
1894                 foreach ( $cvCookies as $cookieName ) {
1895                         $cookiesOption[] = 'string-contains=' . $cookieName;
1896                 }
1897                 $this->addVaryHeader( 'Cookie', $cookiesOption );
1898
1899                 $headers = array();
1900                 foreach ( $this->mVaryHeader as $header => $option ) {
1901                         $newheader = $header;
1902                         if ( is_array( $option ) && count( $option ) > 0 ) {
1903                                 $newheader .= ';' . implode( ';', $option );
1904                         }
1905                         $headers[] = $newheader;
1906                 }
1907                 $xvo = 'X-Vary-Options: ' . implode( ',', $headers );
1908
1909                 return $xvo;
1910         }
1911
1912         /**
1913          * bug 21672: Add Accept-Language to Vary and XVO headers
1914          * if there's no 'variant' parameter existed in GET.
1915          *
1916          * For example:
1917          *   /w/index.php?title=Main_page should always be served; but
1918          *   /w/index.php?title=Main_page&variant=zh-cn should never be served.
1919          */
1920         function addAcceptLanguage() {
1921                 $title = $this->getTitle();
1922                 if ( !$title instanceof Title ) {
1923                         return;
1924                 }
1925
1926                 $lang = $title->getPageLanguage();
1927                 if ( !$this->getRequest()->getCheck( 'variant' ) && $lang->hasVariants() ) {
1928                         $variants = $lang->getVariants();
1929                         $aloption = array();
1930                         foreach ( $variants as $variant ) {
1931                                 if ( $variant === $lang->getCode() ) {
1932                                         continue;
1933                                 } else {
1934                                         $aloption[] = 'string-contains=' . $variant;
1935
1936                                         // IE and some other browsers use BCP 47 standards in
1937                                         // their Accept-Language header, like "zh-CN" or "zh-Hant".
1938                                         // We should handle these too.
1939                                         $variantBCP47 = wfBCP47( $variant );
1940                                         if ( $variantBCP47 !== $variant ) {
1941                                                 $aloption[] = 'string-contains=' . $variantBCP47;
1942                                         }
1943                                 }
1944                         }
1945                         $this->addVaryHeader( 'Accept-Language', $aloption );
1946                 }
1947         }
1948
1949         /**
1950          * Set a flag which will cause an X-Frame-Options header appropriate for
1951          * edit pages to be sent. The header value is controlled by
1952          * $wgEditPageFrameOptions.
1953          *
1954          * This is the default for special pages. If you display a CSRF-protected
1955          * form on an ordinary view page, then you need to call this function.
1956          *
1957          * @param bool $enable
1958          */
1959         public function preventClickjacking( $enable = true ) {
1960                 $this->mPreventClickjacking = $enable;
1961         }
1962
1963         /**
1964          * Turn off frame-breaking. Alias for $this->preventClickjacking(false).
1965          * This can be called from pages which do not contain any CSRF-protected
1966          * HTML form.
1967          */
1968         public function allowClickjacking() {
1969                 $this->mPreventClickjacking = false;
1970         }
1971
1972         /**
1973          * Get the prevent-clickjacking flag
1974          *
1975          * @since 1.24
1976          * @return bool
1977          */
1978         public function getPreventClickjacking() {
1979                 return $this->mPreventClickjacking;
1980         }
1981
1982         /**
1983          * Get the X-Frame-Options header value (without the name part), or false
1984          * if there isn't one. This is used by Skin to determine whether to enable
1985          * JavaScript frame-breaking, for clients that don't support X-Frame-Options.
1986          *
1987          * @return string
1988          */
1989         public function getFrameOptions() {
1990                 $config = $this->getConfig();
1991                 if ( $config->get( 'BreakFrames' ) ) {
1992                         return 'DENY';
1993                 } elseif ( $this->mPreventClickjacking && $config->get( 'EditPageFrameOptions' ) ) {
1994                         return $config->get( 'EditPageFrameOptions' );
1995                 }
1996                 return false;
1997         }
1998
1999         /**
2000          * Send cache control HTTP headers
2001          */
2002         public function sendCacheControl() {
2003                 $response = $this->getRequest()->response();
2004                 $config = $this->getConfig();
2005                 if ( $config->get( 'UseETag' ) && $this->mETag ) {
2006                         $response->header( "ETag: $this->mETag" );
2007                 }
2008
2009                 $this->addVaryHeader( 'Cookie' );
2010                 $this->addAcceptLanguage();
2011
2012                 # don't serve compressed data to clients who can't handle it
2013                 # maintain different caches for logged-in users and non-logged in ones
2014                 $response->header( $this->getVaryHeader() );
2015
2016                 if ( $config->get( 'UseXVO' ) ) {
2017                         # Add an X-Vary-Options header for Squid with Wikimedia patches
2018                         $response->header( $this->getXVO() );
2019                 }
2020
2021                 if ( $this->mEnableClientCache ) {
2022                         if (
2023                                 $config->get( 'UseSquid' ) && session_id() == '' && !$this->isPrintable() &&
2024                                 $this->mSquidMaxage != 0 && !$this->haveCacheVaryCookies()
2025                         ) {
2026                                 if ( $config->get( 'UseESI' ) ) {
2027                                         # We'll purge the proxy cache explicitly, but require end user agents
2028                                         # to revalidate against the proxy on each visit.
2029                                         # Surrogate-Control controls our Squid, Cache-Control downstream caches
2030                                         wfDebug( __METHOD__ . ": proxy caching with ESI; {$this->mLastModified} **\n", 'log' );
2031                                         # start with a shorter timeout for initial testing
2032                                         # header( 'Surrogate-Control: max-age=2678400+2678400, content="ESI/1.0"');
2033                                         $response->header( 'Surrogate-Control: max-age=' . $config->get( 'SquidMaxage' )
2034                                                 . '+' . $this->mSquidMaxage . ', content="ESI/1.0"' );
2035                                         $response->header( 'Cache-Control: s-maxage=0, must-revalidate, max-age=0' );
2036                                 } else {
2037                                         # We'll purge the proxy cache for anons explicitly, but require end user agents
2038                                         # to revalidate against the proxy on each visit.
2039                                         # IMPORTANT! The Squid needs to replace the Cache-Control header with
2040                                         # Cache-Control: s-maxage=0, must-revalidate, max-age=0
2041                                         wfDebug( __METHOD__ . ": local proxy caching; {$this->mLastModified} **\n", 'log' );
2042                                         # start with a shorter timeout for initial testing
2043                                         # header( "Cache-Control: s-maxage=2678400, must-revalidate, max-age=0" );
2044                                         $response->header( 'Cache-Control: s-maxage=' . $this->mSquidMaxage
2045                                                 . ', must-revalidate, max-age=0' );
2046                                 }
2047                         } else {
2048                                 # We do want clients to cache if they can, but they *must* check for updates
2049                                 # on revisiting the page.
2050                                 wfDebug( __METHOD__ . ": private caching; {$this->mLastModified} **\n", 'log' );
2051                                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
2052                                 $response->header( "Cache-Control: private, must-revalidate, max-age=0" );
2053                         }
2054                         if ( $this->mLastModified ) {
2055                                 $response->header( "Last-Modified: {$this->mLastModified}" );
2056                         }
2057                 } else {
2058                         wfDebug( __METHOD__ . ": no caching **\n", 'log' );
2059
2060                         # In general, the absence of a last modified header should be enough to prevent
2061                         # the client from using its cache. We send a few other things just to make sure.
2062                         $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
2063                         $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
2064                         $response->header( 'Pragma: no-cache' );
2065                 }
2066         }
2067
2068         /**
2069          * Finally, all the text has been munged and accumulated into
2070          * the object, let's actually output it:
2071          */
2072         public function output() {
2073                 global $wgLanguageCode;
2074
2075                 if ( $this->mDoNothing ) {
2076                         return;
2077                 }
2078
2079                 wfProfileIn( __METHOD__ );
2080
2081                 $response = $this->getRequest()->response();
2082                 $config = $this->getConfig();
2083
2084                 if ( $this->mRedirect != '' ) {
2085                         # Standards require redirect URLs to be absolute
2086                         $this->mRedirect = wfExpandUrl( $this->mRedirect, PROTO_CURRENT );
2087
2088                         $redirect = $this->mRedirect;
2089                         $code = $this->mRedirectCode;
2090
2091                         if ( wfRunHooks( "BeforePageRedirect", array( $this, &$redirect, &$code ) ) ) {
2092                                 if ( $code == '301' || $code == '303' ) {
2093                                         if ( !$config->get( 'DebugRedirects' ) ) {
2094                                                 $message = HttpStatus::getMessage( $code );
2095                                                 $response->header( "HTTP/1.1 $code $message" );
2096                                         }
2097                                         $this->mLastModified = wfTimestamp( TS_RFC2822 );
2098                                 }
2099                                 if ( $config->get( 'VaryOnXFP' ) ) {
2100                                         $this->addVaryHeader( 'X-Forwarded-Proto' );
2101                                 }
2102                                 $this->sendCacheControl();
2103
2104                                 $response->header( "Content-Type: text/html; charset=utf-8" );
2105                                 if ( $config->get( 'DebugRedirects' ) ) {
2106                                         $url = htmlspecialchars( $redirect );
2107                                         print "<html>\n<head>\n<title>Redirect</title>\n</head>\n<body>\n";
2108                                         print "<p>Location: <a href=\"$url\">$url</a></p>\n";
2109                                         print "</body>\n</html>\n";
2110                                 } else {
2111                                         $response->header( 'Location: ' . $redirect );
2112                                 }
2113                         }
2114
2115                         wfProfileOut( __METHOD__ );
2116                         return;
2117                 } elseif ( $this->mStatusCode ) {
2118                         $message = HttpStatus::getMessage( $this->mStatusCode );
2119                         if ( $message ) {
2120                                 $response->header( 'HTTP/1.1 ' . $this->mStatusCode . ' ' . $message );
2121                         }
2122                 }
2123
2124                 # Buffer output; final headers may depend on later processing
2125                 ob_start();
2126
2127                 $response->header( 'Content-type: ' . $config->get( 'MimeType' ) . '; charset=UTF-8' );
2128                 $response->header( 'Content-language: ' . $wgLanguageCode );
2129
2130                 // Avoid Internet Explorer "compatibility view" in IE 8-10, so that
2131                 // jQuery etc. can work correctly.
2132                 $response->header( 'X-UA-Compatible: IE=Edge' );
2133
2134                 // Prevent framing, if requested
2135                 $frameOptions = $this->getFrameOptions();
2136                 if ( $frameOptions ) {
2137                         $response->header( "X-Frame-Options: $frameOptions" );
2138                 }
2139
2140                 if ( $this->mArticleBodyOnly ) {
2141                         echo $this->mBodytext;
2142                 } else {
2143
2144                         $sk = $this->getSkin();
2145                         // add skin specific modules
2146                         $modules = $sk->getDefaultModules();
2147
2148                         // enforce various default modules for all skins
2149                         $coreModules = array(
2150                                 // keep this list as small as possible
2151                                 'mediawiki.page.startup',
2152                                 'mediawiki.user',
2153                         );
2154
2155                         // Support for high-density display images if enabled
2156                         if ( $config->get( 'ResponsiveImages' ) ) {
2157                                 $coreModules[] = 'mediawiki.hidpi';
2158                         }
2159
2160                         $this->addModules( $coreModules );
2161                         foreach ( $modules as $group ) {
2162                                 $this->addModules( $group );
2163                         }
2164                         MWDebug::addModules( $this );
2165
2166                         // Hook that allows last minute changes to the output page, e.g.
2167                         // adding of CSS or Javascript by extensions.
2168                         wfRunHooks( 'BeforePageDisplay', array( &$this, &$sk ) );
2169
2170                         wfProfileIn( 'Output-skin' );
2171                         $sk->outputPage();
2172                         wfProfileOut( 'Output-skin' );
2173                 }
2174
2175                 // This hook allows last minute changes to final overall output by modifying output buffer
2176                 wfRunHooks( 'AfterFinalPageOutput', array( $this ) );
2177
2178                 $this->sendCacheControl();
2179
2180                 ob_end_flush();
2181
2182                 wfProfileOut( __METHOD__ );
2183         }
2184
2185         /**
2186          * Actually output something with print.
2187          *
2188          * @param string $ins The string to output
2189          * @deprecated since 1.22 Use echo yourself.
2190          */
2191         public function out( $ins ) {
2192                 wfDeprecated( __METHOD__, '1.22' );
2193                 print $ins;
2194         }
2195
2196         /**
2197          * Produce a "user is blocked" page.
2198          * @deprecated since 1.18
2199          */
2200         function blockedPage() {
2201                 throw new UserBlockedError( $this->getUser()->mBlock );
2202         }
2203
2204         /**
2205          * Prepare this object to display an error page; disable caching and
2206          * indexing, clear the current text and redirect, set the page's title
2207          * and optionally an custom HTML title (content of the "<title>" tag).
2208          *
2209          * @param string|Message $pageTitle Will be passed directly to setPageTitle()
2210          * @param string|Message $htmlTitle Will be passed directly to setHTMLTitle();
2211          *                   optional, if not passed the "<title>" attribute will be
2212          *                   based on $pageTitle
2213          */
2214         public function prepareErrorPage( $pageTitle, $htmlTitle = false ) {
2215                 $this->setPageTitle( $pageTitle );
2216                 if ( $htmlTitle !== false ) {
2217                         $this->setHTMLTitle( $htmlTitle );
2218                 }
2219                 $this->setRobotPolicy( 'noindex,nofollow' );
2220                 $this->setArticleRelated( false );
2221                 $this->enableClientCache( false );
2222                 $this->mRedirect = '';
2223                 $this->clearSubtitle();
2224                 $this->clearHTML();
2225         }
2226
2227         /**
2228          * Output a standard error page
2229          *
2230          * showErrorPage( 'titlemsg', 'pagetextmsg' );
2231          * showErrorPage( 'titlemsg', 'pagetextmsg', array( 'param1', 'param2' ) );
2232          * showErrorPage( 'titlemsg', $messageObject );
2233          * showErrorPage( $titleMessageObject, $messageObject );
2234          *
2235          * @param string|Message $title Message key (string) for page title, or a Message object
2236          * @param string|Message $msg Message key (string) for page text, or a Message object
2237          * @param array $params Message parameters; ignored if $msg is a Message object
2238          */
2239         public function showErrorPage( $title, $msg, $params = array() ) {
2240                 if ( !$title instanceof Message ) {
2241                         $title = $this->msg( $title );
2242                 }
2243
2244                 $this->prepareErrorPage( $title );
2245
2246                 if ( $msg instanceof Message ) {
2247                         if ( $params !== array() ) {
2248                                 trigger_error( 'Argument ignored: $params. The message parameters argument '
2249                                         . 'is discarded when the $msg argument is a Message object instead of '
2250                                         . 'a string.', E_USER_NOTICE );
2251                         }
2252                         $this->addHTML( $msg->parseAsBlock() );
2253                 } else {
2254                         $this->addWikiMsgArray( $msg, $params );
2255                 }
2256
2257                 $this->returnToMain();
2258         }
2259
2260         /**
2261          * Output a standard permission error page
2262          *
2263          * @param array $errors Error message keys
2264          * @param string $action Action that was denied or null if unknown
2265          */
2266         public function showPermissionsErrorPage( array $errors, $action = null ) {
2267                 // For some action (read, edit, create and upload), display a "login to do this action"
2268                 // error if all of the following conditions are met:
2269                 // 1. the user is not logged in
2270                 // 2. the only error is insufficient permissions (i.e. no block or something else)
2271                 // 3. the error can be avoided simply by logging in
2272                 if ( in_array( $action, array( 'read', 'edit', 'createpage', 'createtalk', 'upload' ) )
2273                         && $this->getUser()->isAnon() && count( $errors ) == 1 && isset( $errors[0][0] )
2274                         && ( $errors[0][0] == 'badaccess-groups' || $errors[0][0] == 'badaccess-group0' )
2275                         && ( User::groupHasPermission( 'user', $action )
2276                         || User::groupHasPermission( 'autoconfirmed', $action ) )
2277                 ) {
2278                         $displayReturnto = null;
2279
2280                         # Due to bug 32276, if a user does not have read permissions,
2281                         # $this->getTitle() will just give Special:Badtitle, which is
2282                         # not especially useful as a returnto parameter. Use the title
2283                         # from the request instead, if there was one.
2284                         $request = $this->getRequest();
2285                         $returnto = Title::newFromURL( $request->getVal( 'title', '' ) );
2286                         if ( $action == 'edit' ) {
2287                                 $msg = 'whitelistedittext';
2288                                 $displayReturnto = $returnto;
2289                         } elseif ( $action == 'createpage' || $action == 'createtalk' ) {
2290                                 $msg = 'nocreatetext';
2291                         } elseif ( $action == 'upload' ) {
2292                                 $msg = 'uploadnologintext';
2293                         } else { # Read
2294                                 $msg = 'loginreqpagetext';
2295                                 $displayReturnto = Title::newMainPage();
2296                         }
2297
2298                         $query = array();
2299
2300                         if ( $returnto ) {
2301                                 $query['returnto'] = $returnto->getPrefixedText();
2302
2303                                 if ( !$request->wasPosted() ) {
2304                                         $returntoquery = $request->getValues();
2305                                         unset( $returntoquery['title'] );
2306                                         unset( $returntoquery['returnto'] );
2307                                         unset( $returntoquery['returntoquery'] );
2308                                         $query['returntoquery'] = wfArrayToCgi( $returntoquery );
2309                                 }
2310                         }
2311                         $loginLink = Linker::linkKnown(
2312                                 SpecialPage::getTitleFor( 'Userlogin' ),
2313                                 $this->msg( 'loginreqlink' )->escaped(),
2314                                 array(),
2315                                 $query
2316                         );
2317
2318                         $this->prepareErrorPage( $this->msg( 'loginreqtitle' ) );
2319                         $this->addHTML( $this->msg( $msg )->rawParams( $loginLink )->parse() );
2320
2321                         # Don't return to a page the user can't read otherwise
2322                         # we'll end up in a pointless loop
2323                         if ( $displayReturnto && $displayReturnto->userCan( 'read', $this->getUser() ) ) {
2324                                 $this->returnToMain( null, $displayReturnto );
2325                         }
2326                 } else {
2327                         $this->prepareErrorPage( $this->msg( 'permissionserrors' ) );
2328                         $this->addWikiText( $this->formatPermissionsErrorMessage( $errors, $action ) );
2329                 }
2330         }
2331
2332         /**
2333          * Display an error page indicating that a given version of MediaWiki is
2334          * required to use it
2335          *
2336          * @param mixed $version The version of MediaWiki needed to use the page
2337          */
2338         public function versionRequired( $version ) {
2339                 $this->prepareErrorPage( $this->msg( 'versionrequired', $version ) );
2340
2341                 $this->addWikiMsg( 'versionrequiredtext', $version );
2342                 $this->returnToMain();
2343         }
2344
2345         /**
2346          * Display an error page noting that a given permission bit is required.
2347          * @deprecated since 1.18, just throw the exception directly
2348          * @param string $permission Key required
2349          * @throws PermissionsError
2350          */
2351         public function permissionRequired( $permission ) {
2352                 throw new PermissionsError( $permission );
2353         }
2354
2355         /**
2356          * Produce the stock "please login to use the wiki" page
2357          *
2358          * @deprecated since 1.19; throw the exception directly
2359          */
2360         public function loginToUse() {
2361                 throw new PermissionsError( 'read' );
2362         }
2363
2364         /**
2365          * Format a list of error messages
2366          *
2367          * @param array $errors Array of arrays returned by Title::getUserPermissionsErrors
2368          * @param string $action Action that was denied or null if unknown
2369          * @return string The wikitext error-messages, formatted into a list.
2370          */
2371         public function formatPermissionsErrorMessage( array $errors, $action = null ) {
2372                 if ( $action == null ) {
2373                         $text = $this->msg( 'permissionserrorstext', count( $errors ) )->plain() . "\n\n";
2374                 } else {
2375                         $action_desc = $this->msg( "action-$action" )->plain();
2376                         $text = $this->msg(
2377                                 'permissionserrorstext-withaction',
2378                                 count( $errors ),
2379                                 $action_desc
2380                         )->plain() . "\n\n";
2381                 }
2382
2383                 if ( count( $errors ) > 1 ) {
2384                         $text .= '<ul class="permissions-errors">' . "\n";
2385
2386                         foreach ( $errors as $error ) {
2387                                 $text .= '<li>';
2388                                 $text .= call_user_func_array( array( $this, 'msg' ), $error )->plain();
2389                                 $text .= "</li>\n";
2390                         }
2391                         $text .= '</ul>';
2392                 } else {
2393                         $text .= "<div class=\"permissions-errors\">\n" .
2394                                         call_user_func_array( array( $this, 'msg' ), reset( $errors ) )->plain() .
2395                                         "\n</div>";
2396                 }
2397
2398                 return $text;
2399         }
2400
2401         /**
2402          * Display a page stating that the Wiki is in read-only mode,
2403          * and optionally show the source of the page that the user
2404          * was trying to edit.  Should only be called (for this
2405          * purpose) after wfReadOnly() has returned true.
2406          *
2407          * For historical reasons, this function is _also_ used to
2408          * show the error message when a user tries to edit a page
2409          * they are not allowed to edit.  (Unless it's because they're
2410          * blocked, then we show blockedPage() instead.)  In this
2411          * case, the second parameter should be set to true and a list
2412          * of reasons supplied as the third parameter.
2413          *
2414          * @todo Needs to be split into multiple functions.
2415          *
2416          * @param string $source Source code to show (or null).
2417          * @param bool $protected Is this a permissions error?
2418          * @param array $reasons List of reasons for this error, as returned by
2419          *   Title::getUserPermissionsErrors().
2420          * @param string $action Action that was denied or null if unknown
2421          * @throws ReadOnlyError
2422          */
2423         public function readOnlyPage( $source = null, $protected = false,
2424                 array $reasons = array(), $action = null
2425         ) {
2426                 $this->setRobotPolicy( 'noindex,nofollow' );
2427                 $this->setArticleRelated( false );
2428
2429                 // If no reason is given, just supply a default "I can't let you do
2430                 // that, Dave" message.  Should only occur if called by legacy code.
2431                 if ( $protected && empty( $reasons ) ) {
2432                         $reasons[] = array( 'badaccess-group0' );
2433                 }
2434
2435                 if ( !empty( $reasons ) ) {
2436                         // Permissions error
2437                         if ( $source ) {
2438                                 $this->setPageTitle( $this->msg( 'viewsource-title', $this->getTitle()->getPrefixedText() ) );
2439                                 $this->addBacklinkSubtitle( $this->getTitle() );
2440                         } else {
2441                                 $this->setPageTitle( $this->msg( 'badaccess' ) );
2442                         }
2443                         $this->addWikiText( $this->formatPermissionsErrorMessage( $reasons, $action ) );
2444                 } else {
2445                         // Wiki is read only
2446                         throw new ReadOnlyError;
2447                 }
2448
2449                 // Show source, if supplied
2450                 if ( is_string( $source ) ) {
2451                         $this->addWikiMsg( 'viewsourcetext' );
2452
2453                         $pageLang = $this->getTitle()->getPageLanguage();
2454                         $params = array(
2455                                 'id' => 'wpTextbox1',
2456                                 'name' => 'wpTextbox1',
2457                                 'cols' => $this->getUser()->getOption( 'cols' ),
2458                                 'rows' => $this->getUser()->getOption( 'rows' ),
2459                                 'readonly' => 'readonly',
2460                                 'lang' => $pageLang->getHtmlCode(),
2461                                 'dir' => $pageLang->getDir(),
2462                         );
2463                         $this->addHTML( Html::element( 'textarea', $params, $source ) );
2464
2465                         // Show templates used by this article
2466                         $templates = Linker::formatTemplates( $this->getTitle()->getTemplateLinksFrom() );
2467                         $this->addHTML( "<div class='templatesUsed'>
2468 $templates
2469 </div>
2470 " );
2471                 }
2472
2473                 # If the title doesn't exist, it's fairly pointless to print a return
2474                 # link to it.  After all, you just tried editing it and couldn't, so
2475                 # what's there to do there?
2476                 if ( $this->getTitle()->exists() ) {
2477                         $this->returnToMain( null, $this->getTitle() );
2478                 }
2479         }
2480
2481         /**
2482          * Turn off regular page output and return an error response
2483          * for when rate limiting has triggered.
2484          */
2485         public function rateLimited() {
2486                 throw new ThrottledError;
2487         }
2488
2489         /**
2490          * Show a warning about slave lag
2491          *
2492          * If the lag is higher than $wgSlaveLagCritical seconds,
2493          * then the warning is a bit more obvious. If the lag is
2494          * lower than $wgSlaveLagWarning, then no warning is shown.
2495          *
2496          * @param int $lag Slave lag
2497          */
2498         public function showLagWarning( $lag ) {
2499                 $config = $this->getConfig();
2500                 if ( $lag >= $config->get( 'SlaveLagWarning' ) ) {
2501                         $message = $lag < $config->get( 'SlaveLagCritical' )
2502                                 ? 'lag-warn-normal'
2503                                 : 'lag-warn-high';
2504                         $wrap = Html::rawElement( 'div', array( 'class' => "mw-{$message}" ), "\n$1\n" );
2505                         $this->wrapWikiMsg( "$wrap\n", array( $message, $this->getLanguage()->formatNum( $lag ) ) );
2506                 }
2507         }
2508
2509         public function showFatalError( $message ) {
2510                 $this->prepareErrorPage( $this->msg( 'internalerror' ) );
2511
2512                 $this->addHTML( $message );
2513         }
2514
2515         public function showUnexpectedValueError( $name, $val ) {
2516                 $this->showFatalError( $this->msg( 'unexpected', $name, $val )->text() );
2517         }
2518
2519         public function showFileCopyError( $old, $new ) {
2520                 $this->showFatalError( $this->msg( 'filecopyerror', $old, $new )->text() );
2521         }
2522
2523         public function showFileRenameError( $old, $new ) {
2524                 $this->showFatalError( $this->msg( 'filerenameerror', $old, $new )->text() );
2525         }
2526
2527         public function showFileDeleteError( $name ) {
2528                 $this->showFatalError( $this->msg( 'filedeleteerror', $name )->text() );
2529         }
2530
2531         public function showFileNotFoundError( $name ) {
2532                 $this->showFatalError( $this->msg( 'filenotfound', $name )->text() );
2533         }
2534
2535         /**
2536          * Add a "return to" link pointing to a specified title
2537          *
2538          * @param Title $title Title to link
2539          * @param array $query Query string parameters
2540          * @param string $text Text of the link (input is not escaped)
2541          * @param array $options Options array to pass to Linker
2542          */
2543         public function addReturnTo( $title, array $query = array(), $text = null, $options = array() ) {
2544                 $link = $this->msg( 'returnto' )->rawParams(
2545                         Linker::link( $title, $text, array(), $query, $options ) )->escaped();
2546                 $this->addHTML( "<p id=\"mw-returnto\">{$link}</p>\n" );
2547         }
2548
2549         /**
2550          * Add a "return to" link pointing to a specified title,
2551          * or the title indicated in the request, or else the main page
2552          *
2553          * @param mixed $unused
2554          * @param Title|string $returnto Title or String to return to
2555          * @param string $returntoquery Query string for the return to link
2556          */
2557         public function returnToMain( $unused = null, $returnto = null, $returntoquery = null ) {
2558                 if ( $returnto == null ) {
2559                         $returnto = $this->getRequest()->getText( 'returnto' );
2560                 }
2561
2562                 if ( $returntoquery == null ) {
2563                         $returntoquery = $this->getRequest()->getText( 'returntoquery' );
2564                 }
2565
2566                 if ( $returnto === '' ) {
2567                         $returnto = Title::newMainPage();
2568                 }
2569
2570                 if ( is_object( $returnto ) ) {
2571                         $titleObj = $returnto;
2572                 } else {
2573                         $titleObj = Title::newFromText( $returnto );
2574                 }
2575                 if ( !is_object( $titleObj ) ) {
2576                         $titleObj = Title::newMainPage();
2577                 }
2578
2579                 $this->addReturnTo( $titleObj, wfCgiToArray( $returntoquery ) );
2580         }
2581
2582         /**
2583          * @param Skin $sk The given Skin
2584          * @param bool $includeStyle Unused
2585          * @return string The doctype, opening "<html>", and head element.
2586          */
2587         public function headElement( Skin $sk, $includeStyle = true ) {
2588                 global $wgContLang;
2589
2590                 $userdir = $this->getLanguage()->getDir();
2591                 $sitedir = $wgContLang->getDir();
2592
2593                 $ret = Html::htmlHeader( $sk->getHtmlElementAttributes() );
2594
2595                 if ( $this->getHTMLTitle() == '' ) {
2596                         $this->setHTMLTitle( $this->msg( 'pagetitle', $this->getPageTitle() )->inContentLanguage() );
2597                 }
2598
2599                 $openHead = Html::openElement( 'head' );
2600                 if ( $openHead ) {
2601                         # Don't bother with the newline if $head == ''
2602                         $ret .= "$openHead\n";
2603                 }
2604
2605                 if ( !Html::isXmlMimeType( $this->getConfig()->get( 'MimeType' ) ) ) {
2606                         // Add <meta charset="UTF-8">
2607                         // This should be before <title> since it defines the charset used by
2608                         // text including the text inside <title>.
2609                         // The spec recommends defining XHTML5's charset using the XML declaration
2610                         // instead of meta.
2611                         // Our XML declaration is output by Html::htmlHeader.
2612                         // http://www.whatwg.org/html/semantics.html#attr-meta-http-equiv-content-type
2613                         // http://www.whatwg.org/html/semantics.html#charset
2614                         $ret .= Html::element( 'meta', array( 'charset' => 'UTF-8' ) ) . "\n";
2615                 }
2616
2617                 $ret .= Html::element( 'title', null, $this->getHTMLTitle() ) . "\n";
2618
2619                 foreach ( $this->getHeadLinksArray() as $item ) {
2620                         $ret .= $item . "\n";
2621                 }
2622
2623                 // No newline after buildCssLinks since makeResourceLoaderLink did that already
2624                 $ret .= $this->buildCssLinks();
2625
2626                 $ret .= $this->getHeadScripts() . "\n";
2627
2628                 foreach ( $this->mHeadItems as $item ) {
2629                         $ret .= $item . "\n";
2630                 }
2631
2632                 $closeHead = Html::closeElement( 'head' );
2633                 if ( $closeHead ) {
2634                         $ret .= "$closeHead\n";
2635                 }
2636
2637                 $bodyClasses = array();
2638                 $bodyClasses[] = 'mediawiki';
2639
2640                 # Classes for LTR/RTL directionality support
2641                 $bodyClasses[] = $userdir;
2642                 $bodyClasses[] = "sitedir-$sitedir";
2643
2644                 if ( $this->getLanguage()->capitalizeAllNouns() ) {
2645                         # A <body> class is probably not the best way to do this . . .
2646                         $bodyClasses[] = 'capitalize-all-nouns';
2647                 }
2648
2649                 $bodyClasses[] = $sk->getPageClasses( $this->getTitle() );
2650                 $bodyClasses[] = 'skin-' . Sanitizer::escapeClass( $sk->getSkinName() );
2651                 $bodyClasses[] =
2652                         'action-' . Sanitizer::escapeClass( Action::getActionName( $this->getContext() ) );
2653
2654                 $bodyAttrs = array();
2655                 // While the implode() is not strictly needed, it's used for backwards compatibility
2656                 // (this used to be built as a string and hooks likely still expect that).
2657                 $bodyAttrs['class'] = implode( ' ', $bodyClasses );
2658
2659                 // Allow skins and extensions to add body attributes they need
2660                 $sk->addToBodyAttributes( $this, $bodyAttrs );
2661                 wfRunHooks( 'OutputPageBodyAttributes', array( $this, $sk, &$bodyAttrs ) );
2662
2663                 $ret .= Html::openElement( 'body', $bodyAttrs ) . "\n";
2664
2665                 return $ret;
2666         }
2667
2668         /**
2669          * Get a ResourceLoader object associated with this OutputPage
2670          *
2671          * @return ResourceLoader
2672          */
2673         public function getResourceLoader() {
2674                 if ( is_null( $this->mResourceLoader ) ) {
2675                         $this->mResourceLoader = new ResourceLoader( $this->getConfig() );
2676                 }
2677                 return $this->mResourceLoader;
2678         }
2679
2680         /**
2681          * @todo Document
2682          * @param array|string $modules One or more module names
2683          * @param string $only ResourceLoaderModule TYPE_ class constant
2684          * @param bool $useESI
2685          * @param array $extraQuery Array with extra query parameters to add to each
2686          *   request. array( param => value ).
2687          * @param bool $loadCall If true, output an (asynchronous) mw.loader.load()
2688          *   call rather than a "<script src='...'>" tag.
2689          * @return string The html "<script>", "<link>" and "<style>" tags
2690          */
2691         protected function makeResourceLoaderLink( $modules, $only, $useESI = false,
2692                 array $extraQuery = array(), $loadCall = false
2693         ) {
2694                 $modules = (array)$modules;
2695
2696                 $links = array(
2697                         'html' => '',
2698                         'states' => array(),
2699                 );
2700
2701                 if ( !count( $modules ) ) {
2702                         return $links;
2703                 }
2704
2705                 if ( count( $modules ) > 1 ) {
2706                         // Remove duplicate module requests
2707                         $modules = array_unique( $modules );
2708                         // Sort module names so requests are more uniform
2709                         sort( $modules );
2710
2711                         if ( ResourceLoader::inDebugMode() ) {
2712                                 // Recursively call us for every item
2713                                 foreach ( $modules as $name ) {
2714                                         $link = $this->makeResourceLoaderLink( $name, $only, $useESI );
2715                                         $links['html'] .= $link['html'];
2716                                         $links['states'] += $link['states'];
2717                                 }
2718                                 return $links;
2719                         }
2720                 }
2721
2722                 if ( !is_null( $this->mTarget ) ) {
2723                         $extraQuery['target'] = $this->mTarget;
2724                 }
2725
2726                 // Create keyed-by-source and then keyed-by-group list of module objects from modules list
2727                 $sortedModules = array();
2728                 $resourceLoader = $this->getResourceLoader();
2729                 $resourceLoaderUseESI = $this->getConfig()->get( 'ResourceLoaderUseESI' );
2730                 foreach ( $modules as $name ) {
2731                         $module = $resourceLoader->getModule( $name );
2732                         # Check that we're allowed to include this module on this page
2733                         if ( !$module
2734                                 || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_SCRIPTS )
2735                                         && $only == ResourceLoaderModule::TYPE_SCRIPTS )
2736                                 || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_STYLES )
2737                                         && $only == ResourceLoaderModule::TYPE_STYLES )
2738                                 || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_COMBINED )
2739                                         && $only == ResourceLoaderModule::TYPE_COMBINED )
2740                                 || ( $this->mTarget && !in_array( $this->mTarget, $module->getTargets() ) )
2741                         ) {
2742                                 continue;
2743                         }
2744
2745                         $sortedModules[$module->getSource()][$module->getGroup()][$name] = $module;
2746                 }
2747
2748                 foreach ( $sortedModules as $source => $groups ) {
2749                         foreach ( $groups as $group => $grpModules ) {
2750                                 // Special handling for user-specific groups
2751                                 $user = null;
2752                                 if ( ( $group === 'user' || $group === 'private' ) && $this->getUser()->isLoggedIn() ) {
2753                                         $user = $this->getUser()->getName();
2754                                 }
2755
2756                                 // Create a fake request based on the one we are about to make so modules return
2757                                 // correct timestamp and emptiness data
2758                                 $query = ResourceLoader::makeLoaderQuery(
2759                                         array(), // modules; not determined yet
2760                                         $this->getLanguage()->getCode(),
2761                                         $this->getSkin()->getSkinName(),
2762                                         $user,
2763                                         null, // version; not determined yet
2764                                         ResourceLoader::inDebugMode(),
2765                                         $only === ResourceLoaderModule::TYPE_COMBINED ? null : $only,
2766                                         $this->isPrintable(),
2767                                         $this->getRequest()->getBool( 'handheld' ),
2768                                         $extraQuery
2769                                 );
2770                                 $context = new ResourceLoaderContext( $resourceLoader, new FauxRequest( $query ) );
2771
2772                                 // Extract modules that know they're empty
2773                                 foreach ( $grpModules as $key => $module ) {
2774                                         // Inline empty modules: since they're empty, just mark them as 'ready' (bug 46857)
2775                                         // If we're only getting the styles, we don't need to do anything for empty modules.
2776                                         if ( $module->isKnownEmpty( $context ) ) {
2777                                                 unset( $grpModules[$key] );
2778                                                 if ( $only !== ResourceLoaderModule::TYPE_STYLES ) {
2779                                                         $links['states'][$key] = 'ready';
2780                                                 }
2781                                         }
2782                                 }
2783
2784                                 // If there are no non-empty modules, skip this group
2785                                 if ( count( $grpModules ) === 0 ) {
2786                                         continue;
2787                                 }
2788
2789                                 // Inline private modules. These can't be loaded through load.php for security
2790                                 // reasons, see bug 34907. Note that these modules should be loaded from
2791                                 // getHeadScripts() before the first loader call. Otherwise other modules can't
2792                                 // properly use them as dependencies (bug 30914)
2793                                 if ( $group === 'private' ) {
2794                                         if ( $only == ResourceLoaderModule::TYPE_STYLES ) {
2795                                                 $links['html'] .= Html::inlineStyle(
2796                                                         $resourceLoader->makeModuleResponse( $context, $grpModules )
2797                                                 );
2798                                         } else {
2799                                                 $links['html'] .= Html::inlineScript(
2800                                                         ResourceLoader::makeLoaderConditionalScript(
2801                                                                 $resourceLoader->makeModuleResponse( $context, $grpModules )
2802                                                         )
2803                                                 );
2804                                         }
2805                                         $links['html'] .= "\n";
2806                                         continue;
2807                                 }
2808
2809                                 // Special handling for the user group; because users might change their stuff
2810                                 // on-wiki like user pages, or user preferences; we need to find the highest
2811                                 // timestamp of these user-changeable modules so we can ensure cache misses on change
2812                                 // This should NOT be done for the site group (bug 27564) because anons get that too
2813                                 // and we shouldn't be putting timestamps in Squid-cached HTML
2814                                 $version = null;
2815                                 if ( $group === 'user' ) {
2816                                         // Get the maximum timestamp
2817                                         $timestamp = 1;
2818                                         foreach ( $grpModules as $module ) {
2819                                                 $timestamp = max( $timestamp, $module->getModifiedTime( $context ) );
2820                                         }
2821                                         // Add a version parameter so cache will break when things change
2822                                         $query['version'] = wfTimestamp( TS_ISO_8601_BASIC, $timestamp );
2823                                 }
2824
2825                                 $query['modules'] = ResourceLoader::makePackedModulesString( array_keys( $grpModules ) );
2826                                 $moduleContext = new ResourceLoaderContext( $resourceLoader, new FauxRequest( $query ) );
2827                                 $url = $resourceLoader->createLoaderURL( $source, $moduleContext, $extraQuery );
2828
2829                                 if ( $useESI && $resourceLoaderUseESI ) {
2830                                         $esi = Xml::element( 'esi:include', array( 'src' => $url ) );
2831                                         if ( $only == ResourceLoaderModule::TYPE_STYLES ) {
2832                                                 $link = Html::inlineStyle( $esi );
2833                                         } else {
2834                                                 $link = Html::inlineScript( $esi );
2835                                         }
2836                                 } else {
2837                                         // Automatically select style/script elements
2838                                         if ( $only === ResourceLoaderModule::TYPE_STYLES ) {
2839                                                 $link = Html::linkedStyle( $url );
2840                                         } elseif ( $loadCall ) {
2841                                                 $link = Html::inlineScript(
2842                                                         ResourceLoader::makeLoaderConditionalScript(
2843                                                                 Xml::encodeJsCall( 'mw.loader.load', array( $url, 'text/javascript', true ) )
2844                                                         )
2845                                                 );
2846                                         } else {
2847                                                 $link = Html::linkedScript( $url );
2848
2849                                                 // For modules requested directly in the html via <link> or <script>,
2850                                                 // tell mw.loader they are being loading to prevent duplicate requests.
2851                                                 foreach ( $grpModules as $key => $module ) {
2852                                                         // Don't output state=loading for the startup module..
2853                                                         if ( $key !== 'startup' ) {
2854                                                                 $links['states'][$key] = 'loading';
2855                                                         }
2856                                                 }
2857                                         }
2858                                 }
2859
2860                                 if ( $group == 'noscript' ) {
2861                                         $links['html'] .= Html::rawElement( 'noscript', array(), $link ) . "\n";
2862                                 } else {
2863                                         $links['html'] .= $link . "\n";
2864                                 }
2865                         }
2866                 }
2867
2868                 return $links;
2869         }
2870
2871         /**
2872          * Build html output from an array of links from makeResourceLoaderLink.
2873          * @param array $links
2874          * @return string HTML
2875          */
2876         protected static function getHtmlFromLoaderLinks( array $links ) {
2877                 $html = '';
2878                 $states = array();
2879                 foreach ( $links as $link ) {
2880                         if ( !is_array( $link ) ) {
2881                                 $html .= $link;
2882                         } else {
2883                                 $html .= $link['html'];
2884                                 $states += $link['states'];
2885                         }
2886                 }
2887
2888                 if ( count( $states ) ) {
2889                         $html = Html::inlineScript(
2890                                 ResourceLoader::makeLoaderConditionalScript(
2891                                         ResourceLoader::makeLoaderStateScript( $states )
2892                                 )
2893                         ) . "\n" . $html;
2894                 }
2895
2896                 return $html;
2897         }
2898
2899         /**
2900          * JS stuff to put in the "<head>". This is the startup module, config
2901          * vars and modules marked with position 'top'
2902          *
2903          * @return string HTML fragment
2904          */
2905         function getHeadScripts() {
2906                 // Startup - this will immediately load jquery and mediawiki modules
2907                 $links = array();
2908                 $links[] = $this->makeResourceLoaderLink( 'startup', ResourceLoaderModule::TYPE_SCRIPTS, true );
2909
2910                 // Load config before anything else
2911                 $links[] = Html::inlineScript(
2912                         ResourceLoader::makeLoaderConditionalScript(
2913                                 ResourceLoader::makeConfigSetScript( $this->getJSVars() )
2914                         )
2915                 );
2916
2917                 // Load embeddable private modules before any loader links
2918                 // This needs to be TYPE_COMBINED so these modules are properly wrapped
2919                 // in mw.loader.implement() calls and deferred until mw.user is available
2920                 $embedScripts = array( 'user.options', 'user.tokens' );
2921                 $links[] = $this->makeResourceLoaderLink( $embedScripts, ResourceLoaderModule::TYPE_COMBINED );
2922
2923                 // Scripts and messages "only" requests marked for top inclusion
2924                 // Messages should go first
2925                 $links[] = $this->makeResourceLoaderLink(
2926                         $this->getModuleMessages( true, 'top' ),
2927                         ResourceLoaderModule::TYPE_MESSAGES
2928                 );
2929                 $links[] = $this->makeResourceLoaderLink(
2930                         $this->getModuleScripts( true, 'top' ),
2931                         ResourceLoaderModule::TYPE_SCRIPTS
2932                 );
2933
2934                 // Modules requests - let the client calculate dependencies and batch requests as it likes
2935                 // Only load modules that have marked themselves for loading at the top
2936                 $modules = $this->getModules( true, 'top' );
2937                 if ( $modules ) {
2938                         $links[] = Html::inlineScript(
2939                                 ResourceLoader::makeLoaderConditionalScript(
2940                                         Xml::encodeJsCall( 'mw.loader.load', array( $modules ) )
2941                                 )
2942                         );
2943                 }
2944
2945                 if ( $this->getConfig()->get( 'ResourceLoaderExperimentalAsyncLoading' ) ) {
2946                         $links[] = $this->getScriptsForBottomQueue( true );
2947                 }
2948
2949                 return self::getHtmlFromLoaderLinks( $links );
2950         }
2951
2952         /**
2953          * JS stuff to put at the 'bottom', which can either be the bottom of the
2954          * "<body>" or the bottom of the "<head>" depending on
2955          * $wgResourceLoaderExperimentalAsyncLoading: modules marked with position
2956          * 'bottom', legacy scripts ($this->mScripts), user preferences, site JS
2957          * and user JS.
2958          *
2959          * @param bool $inHead If true, this HTML goes into the "<head>",
2960          *   if false it goes into the "<body>".
2961          * @return string
2962          */
2963         function getScriptsForBottomQueue( $inHead ) {
2964                 // Scripts and messages "only" requests marked for bottom inclusion
2965                 // If we're in the <head>, use load() calls rather than <script src="..."> tags
2966                 // Messages should go first
2967                 $links = array();
2968                 $links[] = $this->makeResourceLoaderLink( $this->getModuleMessages( true, 'bottom' ),
2969                         ResourceLoaderModule::TYPE_MESSAGES, /* $useESI = */ false, /* $extraQuery = */ array(),
2970                         /* $loadCall = */ $inHead
2971                 );
2972                 $links[] = $this->makeResourceLoaderLink( $this->getModuleScripts( true, 'bottom' ),
2973                         ResourceLoaderModule::TYPE_SCRIPTS, /* $useESI = */ false, /* $extraQuery = */ array(),
2974                         /* $loadCall = */ $inHead
2975                 );
2976
2977                 // Modules requests - let the client calculate dependencies and batch requests as it likes
2978                 // Only load modules that have marked themselves for loading at the bottom
2979                 $modules = $this->getModules( true, 'bottom' );
2980                 if ( $modules ) {
2981                         $links[] = Html::inlineScript(
2982                                 ResourceLoader::makeLoaderConditionalScript(
2983                                         Xml::encodeJsCall( 'mw.loader.load', array( $modules, null, true ) )
2984                                 )
2985                         );
2986                 }
2987
2988                 // Legacy Scripts
2989                 $links[] = "\n" . $this->mScripts;
2990
2991                 // Add site JS if enabled
2992                 $links[] = $this->makeResourceLoaderLink( 'site', ResourceLoaderModule::TYPE_SCRIPTS,
2993                         /* $useESI = */ false, /* $extraQuery = */ array(), /* $loadCall = */ $inHead
2994                 );
2995
2996                 // Add user JS if enabled
2997                 if ( $this->getConfig()->get( 'AllowUserJs' )
2998                         && $this->getUser()->isLoggedIn()
2999                         && $this->getTitle()
3000                         && $this->getTitle()->isJsSubpage()
3001                         && $this->userCanPreview()
3002                 ) {
3003                         # XXX: additional security check/prompt?
3004                         // We're on a preview of a JS subpage
3005                         // Exclude this page from the user module in case it's in there (bug 26283)
3006                         $links[] = $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_SCRIPTS, false,
3007                                 array( 'excludepage' => $this->getTitle()->getPrefixedDBkey() ), $inHead
3008                         );
3009                         // Load the previewed JS
3010                         $links[] = Html::inlineScript( "\n"
3011                                         . $this->getRequest()->getText( 'wpTextbox1' ) . "\n" ) . "\n";
3012
3013                         // FIXME: If the user is previewing, say, ./vector.js, his ./common.js will be loaded
3014                         // asynchronously and may arrive *after* the inline script here. So the previewed code
3015                         // may execute before ./common.js runs. Normally, ./common.js runs before ./vector.js...
3016                 } else {
3017                         // Include the user module normally, i.e., raw to avoid it being wrapped in a closure.
3018                         $links[] = $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_SCRIPTS,
3019                                 /* $useESI = */ false, /* $extraQuery = */ array(), /* $loadCall = */ $inHead
3020                         );
3021                 }
3022
3023                 // Group JS is only enabled if site JS is enabled.
3024                 $links[] = $this->makeResourceLoaderLink( 'user.groups', ResourceLoaderModule::TYPE_COMBINED,
3025                         /* $useESI = */ false, /* $extraQuery = */ array(), /* $loadCall = */ $inHead
3026                 );
3027
3028                 return self::getHtmlFromLoaderLinks( $links );
3029         }
3030
3031         /**
3032          * JS stuff to put at the bottom of the "<body>"
3033          * @return string
3034          */
3035         function getBottomScripts() {
3036                 // Optimise jQuery ready event cross-browser.
3037                 // This also enforces $.isReady to be true at </body> which fixes the
3038                 // mw.loader bug in Firefox with using document.write between </body>
3039                 // and the DOMContentReady event (bug 47457).
3040                 $html = Html::inlineScript( 'window.jQuery && jQuery.ready();' );
3041
3042                 if ( !$this->getConfig()->get( 'ResourceLoaderExperimentalAsyncLoading' ) ) {
3043                         $html .= $this->getScriptsForBottomQueue( false );
3044                 }
3045
3046                 return $html;
3047         }
3048
3049         /**
3050          * Get the javascript config vars to include on this page
3051          *
3052          * @return array Array of javascript config vars
3053          * @since 1.23
3054          */
3055         public function getJsConfigVars() {
3056                 return $this->mJsConfigVars;
3057         }
3058
3059         /**
3060          * Add one or more variables to be set in mw.config in JavaScript
3061          *
3062          * @param string|array $keys Key or array of key/value pairs
3063          * @param mixed $value [optional] Value of the configuration variable
3064          */
3065         public function addJsConfigVars( $keys, $value = null ) {
3066                 if ( is_array( $keys ) ) {
3067                         foreach ( $keys as $key => $value ) {
3068                                 $this->mJsConfigVars[$key] = $value;
3069                         }
3070                         return;
3071                 }
3072
3073                 $this->mJsConfigVars[$keys] = $value;
3074         }
3075
3076         /**
3077          * Get an array containing the variables to be set in mw.config in JavaScript.
3078          *
3079          * Do not add things here which can be evaluated in ResourceLoaderStartUpModule
3080          * - in other words, page-independent/site-wide variables (without state).
3081          * You will only be adding bloat to the html page and causing page caches to
3082          * have to be purged on configuration changes.
3083          * @return array
3084          */
3085         private function getJSVars() {
3086                 global $wgContLang;
3087
3088                 $curRevisionId = 0;
3089                 $articleId = 0;
3090                 $canonicalSpecialPageName = false; # bug 21115
3091
3092                 $title = $this->getTitle();
3093                 $ns = $title->getNamespace();
3094                 $canonicalNamespace = MWNamespace::exists( $ns )
3095                         ? MWNamespace::getCanonicalName( $ns )
3096                         : $title->getNsText();
3097
3098                 $sk = $this->getSkin();
3099                 // Get the relevant title so that AJAX features can use the correct page name
3100                 // when making API requests from certain special pages (bug 34972).
3101                 $relevantTitle = $sk->getRelevantTitle();
3102                 $relevantUser = $sk->getRelevantUser();
3103
3104                 if ( $ns == NS_SPECIAL ) {
3105                         list( $canonicalSpecialPageName, /*...*/ ) =
3106                                 SpecialPageFactory::resolveAlias( $title->getDBkey() );
3107                 } elseif ( $this->canUseWikiPage() ) {
3108                         $wikiPage = $this->getWikiPage();
3109                         $curRevisionId = $wikiPage->getLatest();
3110                         $articleId = $wikiPage->getId();
3111                 }
3112
3113                 $lang = $title->getPageLanguage();
3114
3115                 // Pre-process information
3116                 $separatorTransTable = $lang->separatorTransformTable();
3117                 $separatorTransTable = $separatorTransTable ? $separatorTransTable : array();
3118                 $compactSeparatorTransTable = array(
3119                         implode( "\t", array_keys( $separatorTransTable ) ),
3120                         implode( "\t", $separatorTransTable ),
3121                 );
3122                 $digitTransTable = $lang->digitTransformTable();
3123                 $digitTransTable = $digitTransTable ? $digitTransTable : array();
3124                 $compactDigitTransTable = array(
3125                         implode( "\t", array_keys( $digitTransTable ) ),
3126                         implode( "\t", $digitTransTable ),
3127                 );
3128
3129                 $user = $this->getUser();
3130
3131                 $vars = array(
3132                         'wgCanonicalNamespace' => $canonicalNamespace,
3133                         'wgCanonicalSpecialPageName' => $canonicalSpecialPageName,
3134                         'wgNamespaceNumber' => $title->getNamespace(),
3135                         'wgPageName' => $title->getPrefixedDBkey(),
3136                         'wgTitle' => $title->getText(),
3137                         'wgCurRevisionId' => $curRevisionId,
3138                         'wgRevisionId' => (int)$this->getRevisionId(),
3139                         'wgArticleId' => $articleId,
3140                         'wgIsArticle' => $this->isArticle(),
3141                         'wgIsRedirect' => $title->isRedirect(),
3142                         'wgAction' => Action::getActionName( $this->getContext() ),
3143                         'wgUserName' => $user->isAnon() ? null : $user->getName(),
3144                         'wgUserGroups' => $user->getEffectiveGroups(),
3145                         'wgCategories' => $this->getCategories(),
3146                         'wgBreakFrames' => $this->getFrameOptions() == 'DENY',
3147                         'wgPageContentLanguage' => $lang->getCode(),
3148                         'wgPageContentModel' => $title->getContentModel(),
3149                         'wgSeparatorTransformTable' => $compactSeparatorTransTable,
3150                         'wgDigitTransformTable' => $compactDigitTransTable,
3151                         'wgDefaultDateFormat' => $lang->getDefaultDateFormat(),
3152                         'wgMonthNames' => $lang->getMonthNamesArray(),
3153                         'wgMonthNamesShort' => $lang->getMonthAbbreviationsArray(),
3154                         'wgRelevantPageName' => $relevantTitle->getPrefixedDBkey(),
3155                 );
3156
3157                 if ( $user->isLoggedIn() ) {
3158                         $vars['wgUserId'] = $user->getId();
3159                         $vars['wgUserEditCount'] = $user->getEditCount();
3160                         $userReg = wfTimestampOrNull( TS_UNIX, $user->getRegistration() );
3161                         $vars['wgUserRegistration'] = $userReg !== null ? ( $userReg * 1000 ) : null;
3162                         // Get the revision ID of the oldest new message on the user's talk
3163                         // page. This can be used for constructing new message alerts on
3164                         // the client side.
3165                         $vars['wgUserNewMsgRevisionId'] = $user->getNewMessageRevisionId();
3166                 }
3167
3168                 if ( $wgContLang->hasVariants() ) {
3169                         $vars['wgUserVariant'] = $wgContLang->getPreferredVariant();
3170                 }
3171                 // Same test as SkinTemplate
3172                 $vars['wgIsProbablyEditable'] = $title->quickUserCan( 'edit', $user )
3173                         && ( $title->exists() || $title->quickUserCan( 'create', $user ) );
3174
3175                 foreach ( $title->getRestrictionTypes() as $type ) {
3176                         $vars['wgRestriction' . ucfirst( $type )] = $title->getRestrictions( $type );
3177                 }
3178
3179                 if ( $title->isMainPage() ) {
3180                         $vars['wgIsMainPage'] = true;
3181                 }
3182
3183                 if ( $this->mRedirectedFrom ) {
3184                         $vars['wgRedirectedFrom'] = $this->mRedirectedFrom->getPrefixedDBkey();
3185                 }
3186
3187                 if ( $relevantUser ) {
3188                         $vars['wgRelevantUserName'] = $relevantUser->getName();
3189                 }
3190
3191                 // Allow extensions to add their custom variables to the mw.config map.
3192                 // Use the 'ResourceLoaderGetConfigVars' hook if the variable is not
3193                 // page-dependant but site-wide (without state).
3194                 // Alternatively, you may want to use OutputPage->addJsConfigVars() instead.
3195                 wfRunHooks( 'MakeGlobalVariablesScript', array( &$vars, $this ) );
3196
3197                 // Merge in variables from addJsConfigVars last
3198                 return array_merge( $vars, $this->getJsConfigVars() );
3199         }
3200
3201         /**
3202          * To make it harder for someone to slip a user a fake
3203          * user-JavaScript or user-CSS preview, a random token
3204          * is associated with the login session. If it's not
3205          * passed back with the preview request, we won't render
3206          * the code.
3207          *
3208          * @return bool
3209          */
3210         public function userCanPreview() {
3211                 if ( $this->getRequest()->getVal( 'action' ) != 'submit'
3212                         || !$this->getRequest()->wasPosted()
3213                         || !$this->getUser()->matchEditToken(
3214                                 $this->getRequest()->getVal( 'wpEditToken' ) )
3215                 ) {
3216                         return false;
3217                 }
3218                 if ( !$this->getTitle()->isJsSubpage() && !$this->getTitle()->isCssSubpage() ) {
3219                         return false;
3220                 }
3221
3222                 return !count( $this->getTitle()->getUserPermissionsErrors( 'edit', $this->getUser() ) );
3223         }
3224
3225         /**
3226          * @return array Array in format "link name or number => 'link html'".
3227          */
3228         public function getHeadLinksArray() {
3229                 global $wgVersion;
3230
3231                 $tags = array();
3232                 $config = $this->getConfig();
3233
3234                 $canonicalUrl = $this->mCanonicalUrl;
3235
3236                 $tags['meta-generator'] = Html::element( 'meta', array(
3237                         'name' => 'generator',
3238                         'content' => "MediaWiki $wgVersion",
3239                 ) );
3240
3241                 $p = "{$this->mIndexPolicy},{$this->mFollowPolicy}";
3242                 if ( $p !== 'index,follow' ) {
3243                         // http://www.robotstxt.org/wc/meta-user.html
3244                         // Only show if it's different from the default robots policy
3245                         $tags['meta-robots'] = Html::element( 'meta', array(
3246                                 'name' => 'robots',
3247                                 'content' => $p,
3248                         ) );
3249                 }
3250
3251                 foreach ( $this->mMetatags as $tag ) {
3252                         if ( 0 == strcasecmp( 'http:', substr( $tag[0], 0, 5 ) ) ) {
3253                                 $a = 'http-equiv';
3254                                 $tag[0] = substr( $tag[0], 5 );
3255                         } else {
3256                                 $a = 'name';
3257                         }
3258                         $tagName = "meta-{$tag[0]}";
3259                         if ( isset( $tags[$tagName] ) ) {
3260                                 $tagName .= $tag[1];
3261                         }
3262                         $tags[$tagName] = Html::element( 'meta',
3263                                 array(
3264                                         $a => $tag[0],
3265                                         'content' => $tag[1]
3266                                 )
3267                         );
3268                 }
3269
3270                 foreach ( $this->mLinktags as $tag ) {
3271                         $tags[] = Html::element( 'link', $tag );
3272                 }
3273
3274                 # Universal edit button
3275                 if ( $config->get( 'UniversalEditButton' ) && $this->isArticleRelated() ) {
3276                         $user = $this->getUser();
3277                         if ( $this->getTitle()->quickUserCan( 'edit', $user )
3278                                 && ( $this->getTitle()->exists() || $this->getTitle()->quickUserCan( 'create', $user ) ) ) {
3279                                 // Original UniversalEditButton
3280                                 $msg = $this->msg( 'edit' )->text();
3281                                 $tags['universal-edit-button'] = Html::element( 'link', array(
3282                                         'rel' => 'alternate',
3283                                         'type' => 'application/x-wiki',
3284                                         'title' => $msg,
3285                                         'href' => $this->getTitle()->getEditURL(),
3286                                 ) );
3287                                 // Alternate edit link
3288                                 $tags['alternative-edit'] = Html::element( 'link', array(
3289                                         'rel' => 'edit',
3290                                         'title' => $msg,
3291                                         'href' => $this->getTitle()->getEditURL(),
3292                                 ) );
3293                         }
3294                 }
3295
3296                 # Generally the order of the favicon and apple-touch-icon links
3297                 # should not matter, but Konqueror (3.5.9 at least) incorrectly
3298                 # uses whichever one appears later in the HTML source. Make sure
3299                 # apple-touch-icon is specified first to avoid this.
3300                 if ( $config->get( 'AppleTouchIcon' ) !== false ) {
3301                         $tags['apple-touch-icon'] = Html::element( 'link', array(
3302                                 'rel' => 'apple-touch-icon',
3303                                 'href' => $config->get( 'AppleTouchIcon' )
3304                         ) );
3305                 }
3306
3307                 if ( $config->get( 'Favicon' ) !== false ) {
3308                         $tags['favicon'] = Html::element( 'link', array(
3309                                 'rel' => 'shortcut icon',
3310                                 'href' => $config->get( 'Favicon' )
3311                         ) );
3312                 }
3313
3314                 # OpenSearch description link
3315                 $tags['opensearch'] = Html::element( 'link', array(
3316                         'rel' => 'search',
3317                         'type' => 'application/opensearchdescription+xml',
3318                         'href' => wfScript( 'opensearch_desc' ),
3319                         'title' => $this->msg( 'opensearch-desc' )->inContentLanguage()->text(),
3320                 ) );
3321
3322                 if ( $config->get( 'EnableAPI' ) ) {
3323                         # Real Simple Discovery link, provides auto-discovery information
3324                         # for the MediaWiki API (and potentially additional custom API
3325                         # support such as WordPress or Twitter-compatible APIs for a
3326                         # blogging extension, etc)
3327                         $tags['rsd'] = Html::element( 'link', array(
3328                                 'rel' => 'EditURI',
3329                                 'type' => 'application/rsd+xml',
3330                                 // Output a protocol-relative URL here if $wgServer is protocol-relative
3331                                 // Whether RSD accepts relative or protocol-relative URLs is completely undocumented, though
3332                                 'href' => wfExpandUrl( wfAppendQuery(
3333                                         wfScript( 'api' ),
3334                                         array( 'action' => 'rsd' ) ),
3335                                         PROTO_RELATIVE
3336                                 ),
3337                         ) );
3338                 }
3339
3340                 # Language variants
3341                 if ( !$config->get( 'DisableLangConversion' ) ) {
3342                         $lang = $this->getTitle()->getPageLanguage();
3343                         if ( $lang->hasVariants() ) {
3344                                 $variants = $lang->getVariants();
3345                                 foreach ( $variants as $_v ) {
3346                                         $tags["variant-$_v"] = Html::element( 'link', array(
3347                                                 'rel' => 'alternate',
3348                                                 'hreflang' => wfBCP47( $_v ),
3349                                                 'href' => $this->getTitle()->getLocalURL( array( 'variant' => $_v ) ) )
3350                                         );
3351                                 }
3352                         }
3353                         # x-default link per https://support.google.com/webmasters/answer/189077?hl=en
3354                         $tags["variant-x-default"] = Html::element( 'link', array(
3355                                 'rel' => 'alternate',
3356                                 'hreflang' => 'x-default',
3357                                 'href' => $this->getTitle()->getLocalURL() ) );
3358                 }
3359
3360                 # Copyright
3361                 $copyright = '';
3362                 if ( $config->get( 'RightsPage' ) ) {
3363                         $copy = Title::newFromText( $config->get( 'RightsPage' ) );
3364
3365                         if ( $copy ) {
3366                                 $copyright = $copy->getLocalURL();
3367                         }
3368                 }
3369
3370                 if ( !$copyright && $config->get( 'RightsUrl' ) ) {
3371                         $copyright = $config->get( 'RightsUrl' );
3372                 }
3373
3374                 if ( $copyright ) {
3375                         $tags['copyright'] = Html::element( 'link', array(
3376                                 'rel' => 'copyright',
3377                                 'href' => $copyright )
3378                         );
3379                 }
3380
3381                 # Feeds
3382                 if ( $config->get( 'Feed' ) ) {
3383                         foreach ( $this->getSyndicationLinks() as $format => $link ) {
3384                                 # Use the page name for the title.  In principle, this could
3385                                 # lead to issues with having the same name for different feeds
3386                                 # corresponding to the same page, but we can't avoid that at
3387                                 # this low a level.
3388
3389                                 $tags[] = $this->feedLink(
3390                                         $format,
3391                                         $link,
3392                                         # Used messages: 'page-rss-feed' and 'page-atom-feed' (for an easier grep)
3393                                         $this->msg( "page-{$format}-feed", $this->getTitle()->getPrefixedText() )->text()
3394                                 );
3395                         }
3396
3397                         # Recent changes feed should appear on every page (except recentchanges,
3398                         # that would be redundant). Put it after the per-page feed to avoid
3399                         # changing existing behavior. It's still available, probably via a
3400                         # menu in your browser. Some sites might have a different feed they'd
3401                         # like to promote instead of the RC feed (maybe like a "Recent New Articles"
3402                         # or "Breaking news" one). For this, we see if $wgOverrideSiteFeed is defined.
3403                         # If so, use it instead.
3404                         $sitename = $config->get( 'Sitename' );
3405                         if ( $config->get( 'OverrideSiteFeed' ) ) {
3406                                 foreach ( $config->get( 'OverrideSiteFeed' ) as $type => $feedUrl ) {
3407                                         // Note, this->feedLink escapes the url.
3408                                         $tags[] = $this->feedLink(
3409                                                 $type,
3410                                                 $feedUrl,
3411                                                 $this->msg( "site-{$type}-feed", $sitename )->text()
3412                                         );
3413                                 }
3414                         } elseif ( !$this->getTitle()->isSpecial( 'Recentchanges' ) ) {
3415                                 $rctitle = SpecialPage::getTitleFor( 'Recentchanges' );
3416                                 foreach ( $config->get( 'AdvertisedFeedTypes' ) as $format ) {
3417                                         $tags[] = $this->feedLink(
3418                                                 $format,
3419                                                 $rctitle->getLocalURL( array( 'feed' => $format ) ),
3420                                                 # For grep: 'site-rss-feed', 'site-atom-feed'
3421                                                 $this->msg( "site-{$format}-feed", $sitename )->text()
3422                                         );
3423                                 }
3424                         }
3425                 }
3426
3427                 # Canonical URL
3428                 if ( $config->get( 'EnableCanonicalServerLink' ) ) {
3429                         if ( $canonicalUrl !== false ) {
3430                                 $canonicalUrl = wfExpandUrl( $canonicalUrl, PROTO_CANONICAL );
3431                         } else {
3432                                 $reqUrl = $this->getRequest()->getRequestURL();
3433                                 $canonicalUrl = wfExpandUrl( $reqUrl, PROTO_CANONICAL );
3434                         }
3435                 }
3436                 if ( $canonicalUrl !== false ) {
3437                         $tags[] = Html::element( 'link', array(
3438                                 'rel' => 'canonical',
3439                                 'href' => $canonicalUrl
3440                         ) );
3441                 }
3442
3443                 return $tags;
3444         }
3445
3446         /**
3447          * @return string HTML tag links to be put in the header.
3448          * @deprecated since 1.24 Use OutputPage::headElement or if you have to,
3449          *   OutputPage::getHeadLinksArray directly.
3450          */
3451         public function getHeadLinks() {
3452                 wfDeprecated( __METHOD__, '1.24' );
3453                 return implode( "\n", $this->getHeadLinksArray() );
3454         }
3455
3456         /**
3457          * Generate a "<link rel/>" for a feed.
3458          *
3459          * @param string $type Feed type
3460          * @param string $url URL to the feed
3461          * @param string $text Value of the "title" attribute
3462          * @return string HTML fragment
3463          */
3464         private function feedLink( $type, $url, $text ) {
3465                 return Html::element( 'link', array(
3466                         'rel' => 'alternate',
3467                         'type' => "application/$type+xml",
3468                         'title' => $text,
3469                         'href' => $url )
3470                 );
3471         }
3472
3473         /**
3474          * Add a local or specified stylesheet, with the given media options.
3475          * Meant primarily for internal use...
3476          *
3477          * @param string $style URL to the file
3478          * @param string $media To specify a media type, 'screen', 'printable', 'handheld' or any.
3479          * @param string $condition For IE conditional comments, specifying an IE version
3480          * @param string $dir Set to 'rtl' or 'ltr' for direction-specific sheets
3481          */
3482         public function addStyle( $style, $media = '', $condition = '', $dir = '' ) {
3483                 $options = array();
3484                 // Even though we expect the media type to be lowercase, but here we
3485                 // force it to lowercase to be safe.
3486                 if ( $media ) {
3487                         $options['media'] = $media;
3488                 }
3489                 if ( $condition ) {
3490                         $options['condition'] = $condition;
3491                 }
3492                 if ( $dir ) {
3493                         $options['dir'] = $dir;
3494                 }
3495                 $this->styles[$style] = $options;
3496         }
3497
3498         /**
3499          * Adds inline CSS styles
3500          * @param mixed $style_css Inline CSS
3501          * @param string $flip Set to 'flip' to flip the CSS if needed
3502          */
3503         public function addInlineStyle( $style_css, $flip = 'noflip' ) {
3504                 if ( $flip === 'flip' && $this->getLanguage()->isRTL() ) {
3505                         # If wanted, and the interface is right-to-left, flip the CSS
3506                         $style_css = CSSJanus::transform( $style_css, true, false );
3507                 } else {
3508                         $style_css = CSSJanus::nullTransform( $style_css );
3509                 }
3510                 $this->mInlineStyles .= Html::inlineStyle( $style_css ) . "\n";
3511         }
3512
3513         /**
3514          * Build a set of "<link>" elements for the stylesheets specified in the $this->styles array.
3515          * These will be applied to various media & IE conditionals.
3516          *
3517          * @return string
3518          */
3519         public function buildCssLinks() {
3520                 global $wgContLang;
3521
3522                 $this->getSkin()->setupSkinUserCss( $this );
3523
3524                 // Add ResourceLoader styles
3525                 // Split the styles into these groups
3526                 $styles = array(
3527                         'other' => array(),
3528                         'user' => array(),
3529                         'site' => array(),
3530                         'private' => array(),
3531                         'noscript' => array()
3532                 );
3533                 $links = array();
3534                 $otherTags = ''; // Tags to append after the normal <link> tags
3535                 $resourceLoader = $this->getResourceLoader();
3536
3537                 $moduleStyles = $this->getModuleStyles();
3538
3539                 // Per-site custom styles
3540                 $moduleStyles[] = 'site';
3541                 $moduleStyles[] = 'noscript';
3542                 $moduleStyles[] = 'user.groups';
3543
3544                 // Per-user custom styles
3545                 if ( $this->getConfig()->get( 'AllowUserCss' ) && $this->getTitle()->isCssSubpage() && $this->userCanPreview() ) {
3546                         // We're on a preview of a CSS subpage
3547                         // Exclude this page from the user module in case it's in there (bug 26283)
3548                         $link = $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_STYLES, false,
3549                                 array( 'excludepage' => $this->getTitle()->getPrefixedDBkey() )
3550                         );
3551                         $otherTags .= $link['html'];
3552
3553                         // Load the previewed CSS
3554                         // If needed, Janus it first. This is user-supplied CSS, so it's
3555                         // assumed to be right for the content language directionality.
3556                         $previewedCSS = $this->getRequest()->getText( 'wpTextbox1' );
3557                         if ( $this->getLanguage()->getDir() !== $wgContLang->getDir() ) {
3558                                 $previewedCSS = CSSJanus::transform( $previewedCSS, true, false );
3559                         } else {
3560                                 $previewedCSS = CSSJanus::nullTransform( $previewedCSS );
3561                         }
3562                         $otherTags .= Html::inlineStyle( $previewedCSS ) . "\n";
3563                 } else {
3564                         // Load the user styles normally
3565                         $moduleStyles[] = 'user';
3566                 }
3567
3568                 // Per-user preference styles
3569                 $moduleStyles[] = 'user.cssprefs';
3570
3571                 foreach ( $moduleStyles as $name ) {
3572                         $module = $resourceLoader->getModule( $name );
3573                         if ( !$module ) {
3574                                 continue;
3575                         }
3576                         $group = $module->getGroup();
3577                         // Modules in groups different than the ones listed on top (see $styles assignment)
3578                         // will be placed in the "other" group
3579                         $styles[isset( $styles[$group] ) ? $group : 'other'][] = $name;
3580                 }
3581
3582                 // We want site, private and user styles to override dynamically added
3583                 // styles from modules, but we want dynamically added styles to override
3584                 // statically added styles from other modules. So the order has to be
3585                 // other, dynamic, site, private, user. Add statically added styles for
3586                 // other modules
3587                 $links[] = $this->makeResourceLoaderLink( $styles['other'], ResourceLoaderModule::TYPE_STYLES );
3588                 // Add normal styles added through addStyle()/addInlineStyle() here
3589                 $links[] = implode( "\n", $this->buildCssLinksArray() ) . $this->mInlineStyles;
3590                 // Add marker tag to mark the place where the client-side loader should inject dynamic styles
3591                 // We use a <meta> tag with a made-up name for this because that's valid HTML
3592                 $links[] = Html::element(
3593                         'meta',
3594                         array( 'name' => 'ResourceLoaderDynamicStyles', 'content' => '' )
3595                 ) . "\n";
3596
3597                 // Add site, private and user styles
3598                 // 'private' at present only contains user.options, so put that before 'user'
3599                 // Any future private modules will likely have a similar user-specific character
3600                 foreach ( array( 'site', 'noscript', 'private', 'user' ) as $group ) {
3601                         $links[] = $this->makeResourceLoaderLink( $styles[$group],
3602                                 ResourceLoaderModule::TYPE_STYLES
3603                         );
3604                 }
3605
3606                 // Add stuff in $otherTags (previewed user CSS if applicable)
3607                 return self::getHtmlFromLoaderLinks( $links ) . $otherTags;
3608         }
3609
3610         /**
3611          * @return array
3612          */
3613         public function buildCssLinksArray() {
3614                 $links = array();
3615
3616                 // Add any extension CSS
3617                 foreach ( $this->mExtStyles as $url ) {
3618                         $this->addStyle( $url );
3619                 }
3620                 $this->mExtStyles = array();
3621
3622                 foreach ( $this->styles as $file => $options ) {
3623                         $link = $this->styleLink( $file, $options );
3624                         if ( $link ) {
3625                                 $links[$file] = $link;
3626                         }
3627                 }
3628                 return $links;
3629         }
3630
3631         /**
3632          * Generate \<link\> tags for stylesheets
3633          *
3634          * @param string $style URL to the file
3635          * @param array $options Option, can contain 'condition', 'dir', 'media' keys
3636          * @return string HTML fragment
3637          */
3638         protected function styleLink( $style, array $options ) {
3639                 if ( isset( $options['dir'] ) ) {
3640                         if ( $this->getLanguage()->getDir() != $options['dir'] ) {
3641                                 return '';
3642                         }
3643                 }
3644
3645                 if ( isset( $options['media'] ) ) {
3646                         $media = self::transformCssMedia( $options['media'] );
3647                         if ( is_null( $media ) ) {
3648                                 return '';
3649                         }
3650                 } else {
3651                         $media = 'all';
3652                 }
3653
3654                 if ( substr( $style, 0, 1 ) == '/' ||
3655                         substr( $style, 0, 5 ) == 'http:' ||
3656                         substr( $style, 0, 6 ) == 'https:' ) {
3657                         $url = $style;
3658                 } else {
3659                         $config = $this->getConfig();
3660                         $url = $config->get( 'StylePath' ) . '/' . $style . '?' . $config->get( 'StyleVersion' );
3661                 }
3662
3663                 $link = Html::linkedStyle( $url, $media );
3664
3665                 if ( isset( $options['condition'] ) ) {
3666                         $condition = htmlspecialchars( $options['condition'] );
3667                         $link = "<!--[if $condition]>$link<![endif]-->";
3668                 }
3669                 return $link;
3670         }
3671
3672         /**
3673          * Transform "media" attribute based on request parameters
3674          *
3675          * @param string $media Current value of the "media" attribute
3676          * @return string Modified value of the "media" attribute, or null to skip
3677          * this stylesheet
3678          */
3679         public static function transformCssMedia( $media ) {
3680                 global $wgRequest;
3681
3682                 // http://www.w3.org/TR/css3-mediaqueries/#syntax
3683                 $screenMediaQueryRegex = '/^(?:only\s+)?screen\b/i';
3684
3685                 // Switch in on-screen display for media testing
3686                 $switches = array(
3687                         'printable' => 'print',
3688                         'handheld' => 'handheld',
3689                 );
3690                 foreach ( $switches as $switch => $targetMedia ) {
3691                         if ( $wgRequest->getBool( $switch ) ) {
3692                                 if ( $media == $targetMedia ) {
3693                                         $media = '';
3694                                 } elseif ( preg_match( $screenMediaQueryRegex, $media ) === 1 ) {
3695                                         // This regex will not attempt to understand a comma-separated media_query_list
3696                                         //
3697                                         // Example supported values for $media:
3698                                         // 'screen', 'only screen', 'screen and (min-width: 982px)' ),
3699                                         // Example NOT supported value for $media:
3700                                         // '3d-glasses, screen, print and resolution > 90dpi'
3701                                         //
3702                                         // If it's a print request, we never want any kind of screen stylesheets
3703                                         // If it's a handheld request (currently the only other choice with a switch),
3704                                         // we don't want simple 'screen' but we might want screen queries that
3705                                         // have a max-width or something, so we'll pass all others on and let the
3706                                         // client do the query.
3707                                         if ( $targetMedia == 'print' || $media == 'screen' ) {
3708                                                 return null;
3709                                         }
3710                                 }
3711                         }
3712                 }
3713
3714                 return $media;
3715         }
3716
3717         /**
3718          * Add a wikitext-formatted message to the output.
3719          * This is equivalent to:
3720          *
3721          *    $wgOut->addWikiText( wfMessage( ... )->plain() )
3722          */
3723         public function addWikiMsg( /*...*/ ) {
3724                 $args = func_get_args();
3725                 $name = array_shift( $args );
3726                 $this->addWikiMsgArray( $name, $args );
3727         }
3728
3729         /**
3730          * Add a wikitext-formatted message to the output.
3731          * Like addWikiMsg() except the parameters are taken as an array
3732          * instead of a variable argument list.
3733          *
3734          * @param string $name
3735          * @param array $args
3736          */
3737         public function addWikiMsgArray( $name, $args ) {
3738                 $this->addHTML( $this->msg( $name, $args )->parseAsBlock() );
3739         }
3740
3741         /**
3742          * This function takes a number of message/argument specifications, wraps them in
3743          * some overall structure, and then parses the result and adds it to the output.
3744          *
3745          * In the $wrap, $1 is replaced with the first message, $2 with the second, and so
3746          * on. The subsequent arguments may either be strings, in which case they are the
3747          * message names, or arrays, in which case the first element is the message name,
3748          * and subsequent elements are the parameters to that message.
3749          *
3750          * Don't use this for messages that are not in users interface language.
3751          *
3752          * For example:
3753          *
3754          *    $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>", 'some-error' );
3755          *
3756          * Is equivalent to:
3757          *
3758          *    $wgOut->addWikiText( "<div class='error'>\n"
3759          *        . wfMessage( 'some-error' )->plain() . "\n</div>" );
3760          *
3761          * The newline after opening div is needed in some wikitext. See bug 19226.
3762          *
3763          * @param string $wrap
3764          */
3765         public function wrapWikiMsg( $wrap /*, ...*/ ) {
3766                 $msgSpecs = func_get_args();
3767                 array_shift( $msgSpecs );
3768                 $msgSpecs = array_values( $msgSpecs );
3769                 $s = $wrap;
3770                 foreach ( $msgSpecs as $n => $spec ) {
3771                         if ( is_array( $spec ) ) {
3772                                 $args = $spec;
3773                                 $name = array_shift( $args );
3774                                 if ( isset( $args['options'] ) ) {
3775                                         unset( $args['options'] );
3776                                         wfDeprecated(
3777                                                 'Adding "options" to ' . __METHOD__ . ' is no longer supported',
3778                                                 '1.20'
3779                                         );
3780                                 }
3781                         } else {
3782                                 $args = array();
3783                                 $name = $spec;
3784                         }
3785                         $s = str_replace( '$' . ( $n + 1 ), $this->msg( $name, $args )->plain(), $s );
3786                 }
3787                 $this->addWikiText( $s );
3788         }
3789
3790         /**
3791          * Include jQuery core. Use this to avoid loading it multiple times
3792          * before we get a usable script loader.
3793          *
3794          * @param array $modules List of jQuery modules which should be loaded
3795          * @return array The list of modules which were not loaded.
3796          * @since 1.16
3797          * @deprecated since 1.17
3798          */
3799         public function includeJQuery( array $modules = array() ) {
3800                 return array();
3801         }
3802
3803         /**
3804          * Enables/disables TOC, doesn't override __NOTOC__
3805          * @param bool $flag
3806          * @since 1.22
3807          */
3808         public function enableTOC( $flag = true ) {
3809                 $this->mEnableTOC = $flag;
3810         }
3811
3812         /**
3813          * @return bool
3814          * @since 1.22
3815          */
3816         public function isTOCEnabled() {
3817                 return $this->mEnableTOC;
3818         }
3819
3820         /**
3821          * Enables/disables section edit links, doesn't override __NOEDITSECTION__
3822          * @param bool $flag
3823          * @since 1.23
3824          */
3825         public function enableSectionEditLinks( $flag = true ) {
3826                 $this->mEnableSectionEditLinks = $flag;
3827         }
3828
3829         /**
3830          * @return bool
3831          * @since 1.23
3832          */
3833         public function sectionEditLinksEnabled() {
3834                 return $this->mEnableSectionEditLinks;
3835         }
3836 }