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 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          */
 315         function __construct( IContextSource $context = null ) {
 316                 if ( $context === null ) {
 317                         # Extensions should use `new RequestContext` instead of `new OutputPage` now.
 318                         wfDeprecated( __METHOD__, '1.18' );
 319                 } else {
 320                         $this->setContext( $context );
 321                 }
 322         }
 323
 324         /**
 325          * Redirect to $url rather than displaying the normal page
 326          *
 327          * @param string $url URL
 328          * @param string $responsecode HTTP status code
 329          */
 330         public function redirect( $url, $responsecode = '302' ) {
 331                 # Strip newlines as a paranoia check for header injection in PHP<5.1.2
 332                 $this->mRedirect = str_replace( "\n", '', $url );
 333                 $this->mRedirectCode = $responsecode;
 334         }
 335
 336         /**
 337          * Get the URL to redirect to, or an empty string if not redirect URL set
 338          *
 339          * @return string
 340          */
 341         public function getRedirect() {
 342                 return $this->mRedirect;
 343         }
 344
 345         /**
 346          * Set the HTTP status code to send with the output.
 347          *
 348          * @param int $statusCode
 349          */
 350         public function setStatusCode( $statusCode ) {
 351                 $this->mStatusCode = $statusCode;
 352         }
 353
 354         /**
 355          * Add a new "<meta>" tag
 356          * To add an http-equiv meta tag, precede the name with "http:"
 357          *
 358          * @param string $name tag name
 359          * @param string $val tag value
 360          */
 361         function addMeta( $name, $val ) {
 362                 array_push( $this->mMetatags, array( $name, $val ) );
 363         }
 364
 365         /**
 366          * Add a new \<link\> tag to the page header.
 367          *
 368          * Note: use setCanonicalUrl() for rel=canonical.
 369          *
 370          * @param array $linkarr associative array of attributes.
 371          */
 372         function addLink( $linkarr ) {
 373                 array_push( $this->mLinktags, $linkarr );
 374         }
 375
 376         /**
 377          * Add a new \<link\> with "rel" attribute set to "meta"
 378          *
 379          * @param array $linkarr associative array mapping attribute names to their
 380          *                 values, both keys and values will be escaped, and the
 381          *                 "rel" attribute will be automatically added
 382          */
 383         function addMetadataLink( $linkarr ) {
 384                 $linkarr['rel'] = $this->getMetadataAttribute();
 385                 $this->addLink( $linkarr );
 386         }
 387
 388         /**
 389          * Set the URL to be used for the <link rel=canonical>. This should be used
 390          * in preference to addLink(), to avoid duplicate link tags.
 391          */
 392         function setCanonicalUrl( $url ) {
 393                 $this->mCanonicalUrl = $url;
 394         }
 395
 396         /**
 397          * Get the value of the "rel" attribute for metadata links
 398          *
 399          * @return string
 400          */
 401         public function getMetadataAttribute() {
 402                 # note: buggy CC software only reads first "meta" link
 403                 static $haveMeta = false;
 404                 if ( $haveMeta ) {
 405                         return 'alternate meta';
 406                 } else {
 407                         $haveMeta = true;
 408                         return 'meta';
 409                 }
 410         }
 411
 412         /**
 413          * Add raw HTML to the list of scripts (including \<script\> tag, etc.)
 414          *
 415          * @param string $script raw HTML
 416          */
 417         function addScript( $script ) {
 418                 $this->mScripts .= $script . "\n";
 419         }
 420
 421         /**
 422          * Register and add a stylesheet from an extension directory.
 423          *
 424          * @param string $url path to sheet.  Provide either a full url (beginning
 425          *             with 'http', etc) or a relative path from the document root
 426          *             (beginning with '/').  Otherwise it behaves identically to
 427          *             addStyle() and draws from the /skins folder.
 428          */
 429         public function addExtensionStyle( $url ) {
 430                 array_push( $this->mExtStyles, $url );
 431         }
 432
 433         /**
 434          * Get all styles added by extensions
 435          *
 436          * @return array
 437          */
 438         function getExtStyle() {
 439                 return $this->mExtStyles;
 440         }
 441
 442         /**
 443          * Add a JavaScript file out of skins/common, or a given relative path.
 444          *
 445          * @param string $file filename in skins/common or complete on-server path
 446          *              (/foo/bar.js)
 447          * @param string $version style version of the file. Defaults to $wgStyleVersion
 448          */
 449         public function addScriptFile( $file, $version = null ) {
 450                 global $wgStylePath, $wgStyleVersion;
 451                 // See if $file parameter is an absolute URL or begins with a slash
 452                 if ( substr( $file, 0, 1 ) == '/' || preg_match( '#^[a-z]*://#i', $file ) ) {
 453                         $path = $file;
 454                 } else {
 455                         $path = "{$wgStylePath}/common/{$file}";
 456                 }
 457                 if ( is_null( $version ) ) {
 458                         $version = $wgStyleVersion;
 459                 }
 460                 $this->addScript( Html::linkedScript( wfAppendQuery( $path, $version ) ) );
 461         }
 462
 463         /**
 464          * Add a self-contained script tag with the given contents
 465          *
 466          * @param string $script JavaScript text, no "<script>" tags
 467          */
 468         public function addInlineScript( $script ) {
 469                 $this->mScripts .= Html::inlineScript( "\n$script\n" ) . "\n";
 470         }
 471
 472         /**
 473          * Get all registered JS and CSS tags for the header.
 474          *
 475          * @return string
 476          */
 477         function getScript() {
 478                 return $this->mScripts . $this->getHeadItems();
 479         }
 480
 481         /**
 482          * Filter an array of modules to remove insufficiently trustworthy members, and modules
 483          * which are no longer registered (eg a page is cached before an extension is disabled)
 484          * @param array $modules
 485          * @param string|null $position if not null, only return modules with this position
 486          * @param string $type
 487          * @return array
 488          */
 489         protected function filterModules( $modules, $position = null,
 490                 $type = ResourceLoaderModule::TYPE_COMBINED
 491         ) {
 492                 $resourceLoader = $this->getResourceLoader();
 493                 $filteredModules = array();
 494                 foreach ( $modules as $val ) {
 495                         $module = $resourceLoader->getModule( $val );
 496                         if ( $module instanceof ResourceLoaderModule
 497                                 && $module->getOrigin() <= $this->getAllowedModules( $type )
 498                                 && ( is_null( $position ) || $module->getPosition() == $position )
 499                                 && ( !$this->mTarget || in_array( $this->mTarget, $module->getTargets() ) )
 500                         ) {
 501                                 $filteredModules[] = $val;
 502                         }
 503                 }
 504                 return $filteredModules;
 505         }
 506
 507         /**
 508          * Get the list of modules to include on this page
 509          *
 510          * @param bool $filter Whether to filter out insufficiently trustworthy modules
 511          * @param string|null $position If not null, only return modules with this position
 512          * @param string $param
 513          * @return array Array of module names
 514          */
 515         public function getModules( $filter = false, $position = null, $param = 'mModules' ) {
 516                 $modules = array_values( array_unique( $this->$param ) );
 517                 return $filter
 518                         ? $this->filterModules( $modules, $position )
 519                         : $modules;
 520         }
 521
 522         /**
 523          * Add one or more modules recognized by the resource loader. Modules added
 524          * through this function will be loaded by the resource loader when the
 525          * page loads.
 526          *
 527          * @param string|array $modules Module name (string) or array of module names
 528          */
 529         public function addModules( $modules ) {
 530                 $this->mModules = array_merge( $this->mModules, (array)$modules );
 531         }
 532
 533         /**
 534          * Get the list of module JS to include on this page
 535          *
 536          * @param bool $filter
 537          * @param string|null $position
 538          *
 539          * @return array Array of module names
 540          */
 541         public function getModuleScripts( $filter = false, $position = null ) {
 542                 return $this->getModules( $filter, $position, 'mModuleScripts' );
 543         }
 544
 545         /**
 546          * Add only JS of one or more modules recognized by the resource loader. Module
 547          * scripts added through this function will be loaded by the resource loader when
 548          * the page loads.
 549          *
 550          * @param string|array $modules Module name (string) or array of module names
 551          */
 552         public function addModuleScripts( $modules ) {
 553                 $this->mModuleScripts = array_merge( $this->mModuleScripts, (array)$modules );
 554         }
 555
 556         /**
 557          * Get the list of module CSS to include on this page
 558          *
 559          * @param bool $filter
 560          * @param string|null $position
 561          *
 562          * @return array Array of module names
 563          */
 564         public function getModuleStyles( $filter = false, $position = null ) {
 565                 return $this->getModules( $filter, $position, 'mModuleStyles' );
 566         }
 567
 568         /**
 569          * Add only CSS of one or more modules recognized by the resource loader.
 570          *
 571          * Module styles added through this function will be added using standard link CSS
 572          * tags, rather than as a combined Javascript and CSS package. Thus, they will
 573          * load when JavaScript is disabled (unless CSS also happens to be disabled).
 574          *
 575          * @param string|array $modules Module name (string) or array of module names
 576          */
 577         public function addModuleStyles( $modules ) {
 578                 $this->mModuleStyles = array_merge( $this->mModuleStyles, (array)$modules );
 579         }
 580
 581         /**
 582          * Get the list of module messages to include on this page
 583          *
 584          * @param bool $filter
 585          * @param string|null $position
 586          *
 587          * @return array Array of module names
 588          */
 589         public function getModuleMessages( $filter = false, $position = null ) {
 590                 return $this->getModules( $filter, $position, 'mModuleMessages' );
 591         }
 592
 593         /**
 594          * Add only messages of one or more modules recognized by the resource loader.
 595          * Module messages added through this function will be loaded by the resource
 596          * loader when the page loads.
 597          *
 598          * @param string|array $modules Module name (string) or array of module names
 599          */
 600         public function addModuleMessages( $modules ) {
 601                 $this->mModuleMessages = array_merge( $this->mModuleMessages, (array)$modules );
 602         }
 603
 604         /**
 605          * @return null|string ResourceLoader target
 606          */
 607         public function getTarget() {
 608                 return $this->mTarget;
 609         }
 610
 611         /**
 612          * Sets ResourceLoader target for load.php links. If null, will be omitted
 613          *
 614          * @param string|null $target
 615          */
 616         public function setTarget( $target ) {
 617                 $this->mTarget = $target;
 618         }
 619
 620         /**
 621          * Get an array of head items
 622          *
 623          * @return array
 624          */
 625         function getHeadItemsArray() {
 626                 return $this->mHeadItems;
 627         }
 628
 629         /**
 630          * Get all header items in a string
 631          *
 632          * @return string
 633          */
 634         function getHeadItems() {
 635                 $s = '';
 636                 foreach ( $this->mHeadItems as $item ) {
 637                         $s .= $item;
 638                 }
 639                 return $s;
 640         }
 641
 642         /**
 643          * Add or replace an header item to the output
 644          *
 645          * @param string $name item name
 646          * @param string $value raw HTML
 647          */
 648         public function addHeadItem( $name, $value ) {
 649                 $this->mHeadItems[$name] = $value;
 650         }
 651
 652         /**
 653          * Check if the header item $name is already set
 654          *
 655          * @param string $name Item name
 656          * @return bool
 657          */
 658         public function hasHeadItem( $name ) {
 659                 return isset( $this->mHeadItems[$name] );
 660         }
 661
 662         /**
 663          * Set the value of the ETag HTTP header, only used if $wgUseETag is true
 664          *
 665          * @param string $tag value of "ETag" header
 666          */
 667         function setETag( $tag ) {
 668                 $this->mETag = $tag;
 669         }
 670
 671         /**
 672          * Set whether the output should only contain the body of the article,
 673          * without any skin, sidebar, etc.
 674          * Used e.g. when calling with "action=render".
 675          *
 676          * @param bool $only Whether to output only the body of the article
 677          */
 678         public function setArticleBodyOnly( $only ) {
 679                 $this->mArticleBodyOnly = $only;
 680         }
 681
 682         /**
 683          * Return whether the output will contain only the body of the article
 684          *
 685          * @return bool
 686          */
 687         public function getArticleBodyOnly() {
 688                 return $this->mArticleBodyOnly;
 689         }
 690
 691         /**
 692          * Set an additional output property
 693          * @since 1.21
 694          *
 695          * @param string $name
 696          * @param mixed $value
 697          */
 698         public function setProperty( $name, $value ) {
 699                 $this->mProperties[$name] = $value;
 700         }
 701
 702         /**
 703          * Get an additional output property
 704          * @since 1.21
 705          *
 706          * @param string $name
 707          * @return mixed Property value or null if not found
 708          */
 709         public function getProperty( $name ) {
 710                 if ( isset( $this->mProperties[$name] ) ) {
 711                         return $this->mProperties[$name];
 712                 } else {
 713                         return null;
 714                 }
 715         }
 716
 717         /**
 718          * checkLastModified tells the client to use the client-cached page if
 719          * possible. If successful, the OutputPage is disabled so that
 720          * any future call to OutputPage->output() have no effect.
 721          *
 722          * Side effect: sets mLastModified for Last-Modified header
 723          *
 724          * @param string $timestamp
 725          *
 726          * @return bool True if cache-ok headers was sent.
 727          */
 728         public function checkLastModified( $timestamp ) {
 729                 global $wgCachePages, $wgCacheEpoch, $wgUseSquid, $wgSquidMaxage;
 730
 731                 if ( !$timestamp || $timestamp == '19700101000000' ) {
 732                         wfDebug( __METHOD__ . ": CACHE DISABLED, NO TIMESTAMP\n" );
 733                         return false;
 734                 }
 735                 if ( !$wgCachePages ) {
 736                         wfDebug( __METHOD__ . ": CACHE DISABLED\n" );
 737                         return false;
 738                 }
 739
 740                 $timestamp = wfTimestamp( TS_MW, $timestamp );
 741                 $modifiedTimes = array(
 742                         'page' => $timestamp,
 743                         'user' => $this->getUser()->getTouched(),
 744                         'epoch' => $wgCacheEpoch
 745                 );
 746                 if ( $wgUseSquid ) {
 747                         // bug 44570: the core page itself may not change, but resources might
 748                         $modifiedTimes['sepoch'] = wfTimestamp( TS_MW, time() - $wgSquidMaxage );
 749                 }
 750                 wfRunHooks( 'OutputPageCheckLastModified', array( &$modifiedTimes ) );
 751
 752                 $maxModified = max( $modifiedTimes );
 753                 $this->mLastModified = wfTimestamp( TS_RFC2822, $maxModified );
 754
 755                 $clientHeader = $this->getRequest()->getHeader( 'If-Modified-Since' );
 756                 if ( $clientHeader === false ) {
 757                         wfDebug( __METHOD__ . ": client did not send If-Modified-Since header\n", 'log' );
 758                         return false;
 759                 }
 760
 761                 # IE sends sizes after the date like this:
 762                 # Wed, 20 Aug 2003 06:51:19 GMT; length=5202
 763                 # this breaks strtotime().
 764                 $clientHeader = preg_replace( '/;.*$/', '', $clientHeader );
 765
 766                 wfSuppressWarnings(); // E_STRICT system time bitching
 767                 $clientHeaderTime = strtotime( $clientHeader );
 768                 wfRestoreWarnings();
 769                 if ( !$clientHeaderTime ) {
 770                         wfDebug( __METHOD__
 771                                 . ": unable to parse the client's If-Modified-Since header: $clientHeader\n" );
 772                         return false;
 773                 }
 774                 $clientHeaderTime = wfTimestamp( TS_MW, $clientHeaderTime );
 775
 776                 # Make debug info
 777                 $info = '';
 778                 foreach ( $modifiedTimes as $name => $value ) {
 779                         if ( $info !== '' ) {
 780                                 $info .= ', ';
 781                         }
 782                         $info .= "$name=" . wfTimestamp( TS_ISO_8601, $value );
 783                 }
 784
 785                 wfDebug( __METHOD__ . ": client sent If-Modified-Since: " .
 786                         wfTimestamp( TS_ISO_8601, $clientHeaderTime ) . "\n", 'log' );
 787                 wfDebug( __METHOD__ . ": effective Last-Modified: " .
 788                         wfTimestamp( TS_ISO_8601, $maxModified ) . "\n", 'log' );
 789                 if ( $clientHeaderTime < $maxModified ) {
 790                         wfDebug( __METHOD__ . ": STALE, $info\n", 'log' );
 791                         return false;
 792                 }
 793
 794                 # Not modified
 795                 # Give a 304 response code and disable body output
 796                 wfDebug( __METHOD__ . ": NOT MODIFIED, $info\n", 'log' );
 797                 ini_set( 'zlib.output_compression', 0 );
 798                 $this->getRequest()->response()->header( "HTTP/1.1 304 Not Modified" );
 799                 $this->sendCacheControl();
 800                 $this->disable();
 801
 802                 // Don't output a compressed blob when using ob_gzhandler;
 803                 // it's technically against HTTP spec and seems to confuse
 804                 // Firefox when the response gets split over two packets.
 805                 wfClearOutputBuffers();
 806
 807                 return true;
 808         }
 809
 810         /**
 811          * Override the last modified timestamp
 812          *
 813          * @param string $timestamp new timestamp, in a format readable by
 814          *        wfTimestamp()
 815          */
 816         public function setLastModified( $timestamp ) {
 817                 $this->mLastModified = wfTimestamp( TS_RFC2822, $timestamp );
 818         }
 819
 820         /**
 821          * Set the robot policy for the page: <http://www.robotstxt.org/meta.html>
 822          *
 823          * @param string $policy the literal string to output as the contents of
 824          *   the meta tag.  Will be parsed according to the spec and output in
 825          *   standardized form.
 826          * @return null
 827          */
 828         public function setRobotPolicy( $policy ) {
 829                 $policy = Article::formatRobotPolicy( $policy );
 830
 831                 if ( isset( $policy['index'] ) ) {
 832                         $this->setIndexPolicy( $policy['index'] );
 833                 }
 834                 if ( isset( $policy['follow'] ) ) {
 835                         $this->setFollowPolicy( $policy['follow'] );
 836                 }
 837         }
 838
 839         /**
 840          * Set the index policy for the page, but leave the follow policy un-
 841          * touched.
 842          *
 843          * @param string $policy Either 'index' or 'noindex'.
 844          * @return null
 845          */
 846         public function setIndexPolicy( $policy ) {
 847                 $policy = trim( $policy );
 848                 if ( in_array( $policy, array( 'index', 'noindex' ) ) ) {
 849                         $this->mIndexPolicy = $policy;
 850                 }
 851         }
 852
 853         /**
 854          * Set the follow policy for the page, but leave the index policy un-
 855          * touched.
 856          *
 857          * @param string $policy either 'follow' or 'nofollow'.
 858          * @return null
 859          */
 860         public function setFollowPolicy( $policy ) {
 861                 $policy = trim( $policy );
 862                 if ( in_array( $policy, array( 'follow', 'nofollow' ) ) ) {
 863                         $this->mFollowPolicy = $policy;
 864                 }
 865         }
 866
 867         /**
 868          * Set the new value of the "action text", this will be added to the
 869          * "HTML title", separated from it with " - ".
 870          *
 871          * @param string $text new value of the "action text"
 872          */
 873         public function setPageTitleActionText( $text ) {
 874                 $this->mPageTitleActionText = $text;
 875         }
 876
 877         /**
 878          * Get the value of the "action text"
 879          *
 880          * @return string
 881          */
 882         public function getPageTitleActionText() {
 883                 if ( isset( $this->mPageTitleActionText ) ) {
 884                         return $this->mPageTitleActionText;
 885                 }
 886                 return '';
 887         }
 888
 889         /**
 890          * "HTML title" means the contents of "<title>".
 891          * It is stored as plain, unescaped text and will be run through htmlspecialchars in the skin file.
 892          *
 893          * @param string $name
 894          */
 895         public function setHTMLTitle( $name ) {
 896                 if ( $name instanceof Message ) {
 897                         $this->mHTMLtitle = $name->setContext( $this->getContext() )->text();
 898                 } else {
 899                         $this->mHTMLtitle = $name;
 900                 }
 901         }
 902
 903         /**
 904          * Return the "HTML title", i.e. the content of the "<title>" tag.
 905          *
 906          * @return string
 907          */
 908         public function getHTMLTitle() {
 909                 return $this->mHTMLtitle;
 910         }
 911
 912         /**
 913          * Set $mRedirectedFrom, the Title of the page which redirected us to the current page.
 914          *
 915          * @param Title $t
 916          */
 917         public function setRedirectedFrom( $t ) {
 918                 $this->mRedirectedFrom = $t;
 919         }
 920
 921         /**
 922          * "Page title" means the contents of \<h1\>. It is stored as a valid HTML
 923          * fragment. This function allows good tags like \<sup\> in the \<h1\> tag,
 924          * but not bad tags like \<script\>. This function automatically sets
 925          * \<title\> to the same content as \<h1\> but with all tags removed. Bad
 926          * tags that were escaped in \<h1\> will still be escaped in \<title\>, and
 927          * good tags like \<i\> will be dropped entirely.
 928          *
 929          * @param string|Message $name
 930          */
 931         public function setPageTitle( $name ) {
 932                 if ( $name instanceof Message ) {
 933                         $name = $name->setContext( $this->getContext() )->text();
 934                 }
 935
 936                 # change "<script>foo&bar</script>" to "&lt;script&gt;foo&amp;bar&lt;/script&gt;"
 937                 # but leave "<i>foobar</i>" alone
 938                 $nameWithTags = Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags( $name ) );
 939                 $this->mPagetitle = $nameWithTags;
 940
 941                 # change "<i>foo&amp;bar</i>" to "foo&bar"
 942                 $this->setHTMLTitle(
 943                         $this->msg( 'pagetitle' )->rawParams( Sanitizer::stripAllTags( $nameWithTags ) )
 944                                 ->inContentLanguage()
 945                 );
 946         }
 947
 948         /**
 949          * Return the "page title", i.e. the content of the \<h1\> tag.
 950          *
 951          * @return string
 952          */
 953         public function getPageTitle() {
 954                 return $this->mPagetitle;
 955         }
 956
 957         /**
 958          * Set the Title object to use
 959          *
 960          * @param Title $t
 961          */
 962         public function setTitle( Title $t ) {
 963                 $this->getContext()->setTitle( $t );
 964         }
 965
 966         /**
 967          * Replace the subtitle with $str
 968          *
 969          * @param string|Message $str new value of the subtitle. String should be safe HTML.
 970          */
 971         public function setSubtitle( $str ) {
 972                 $this->clearSubtitle();
 973                 $this->addSubtitle( $str );
 974         }
 975
 976         /**
 977          * Add $str to the subtitle
 978          *
 979          * @deprecated since 1.19; use addSubtitle() instead
 980          * @param string|Message $str to add to the subtitle
 981          */
 982         public function appendSubtitle( $str ) {
 983                 $this->addSubtitle( $str );
 984         }
 985
 986         /**
 987          * Add $str to the subtitle
 988          *
 989          * @param string|Message $str to add to the subtitle. String should be safe HTML.
 990          */
 991         public function addSubtitle( $str ) {
 992                 if ( $str instanceof Message ) {
 993                         $this->mSubtitle[] = $str->setContext( $this->getContext() )->parse();
 994                 } else {
 995                         $this->mSubtitle[] = $str;
 996                 }
 997         }
 998
 999         /**
1000          * Add a subtitle containing a backlink to a page
1001          *
1002          * @param Title $title Title to link to
1003          */
1004         public function addBacklinkSubtitle( Title $title ) {
1005                 $query = array();
1006                 if ( $title->isRedirect() ) {
1007                         $query['redirect'] = 'no';
1008                 }
1009                 $this->addSubtitle( $this->msg( 'backlinksubtitle' )
1010                         ->rawParams( Linker::link( $title, null, array(), $query ) ) );
1011         }
1012
1013         /**
1014          * Clear the subtitles
1015          */
1016         public function clearSubtitle() {
1017                 $this->mSubtitle = array();
1018         }
1019
1020         /**
1021          * Get the subtitle
1022          *
1023          * @return string
1024          */
1025         public function getSubtitle() {
1026                 return implode( "<br />\n\t\t\t\t", $this->mSubtitle );
1027         }
1028
1029         /**
1030          * Set the page as printable, i.e. it'll be displayed with with all
1031          * print styles included
1032          */
1033         public function setPrintable() {
1034                 $this->mPrintable = true;
1035         }
1036
1037         /**
1038          * Return whether the page is "printable"
1039          *
1040          * @return bool
1041          */
1042         public function isPrintable() {
1043                 return $this->mPrintable;
1044         }
1045
1046         /**
1047          * Disable output completely, i.e. calling output() will have no effect
1048          */
1049         public function disable() {
1050                 $this->mDoNothing = true;
1051         }
1052
1053         /**
1054          * Return whether the output will be completely disabled
1055          *
1056          * @return bool
1057          */
1058         public function isDisabled() {
1059                 return $this->mDoNothing;
1060         }
1061
1062         /**
1063          * Show an "add new section" link?
1064          *
1065          * @return bool
1066          */
1067         public function showNewSectionLink() {
1068                 return $this->mNewSectionLink;
1069         }
1070
1071         /**
1072          * Forcibly hide the new section link?
1073          *
1074          * @return bool
1075          */
1076         public function forceHideNewSectionLink() {
1077                 return $this->mHideNewSectionLink;
1078         }
1079
1080         /**
1081          * Add or remove feed links in the page header
1082          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
1083          * for the new version
1084          * @see addFeedLink()
1085          *
1086          * @param bool $show true: add default feeds, false: remove all feeds
1087          */
1088         public function setSyndicated( $show = true ) {
1089                 if ( $show ) {
1090                         $this->setFeedAppendQuery( false );
1091                 } else {
1092                         $this->mFeedLinks = array();
1093                 }
1094         }
1095
1096         /**
1097          * Add default feeds to the page header
1098          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
1099          * for the new version
1100          * @see addFeedLink()
1101          *
1102          * @param string $val query to append to feed links or false to output
1103          *        default links
1104          */
1105         public function setFeedAppendQuery( $val ) {
1106                 global $wgAdvertisedFeedTypes;
1107
1108                 $this->mFeedLinks = array();
1109
1110                 foreach ( $wgAdvertisedFeedTypes 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                 global $wgAdvertisedFeedTypes;
1127
1128                 if ( in_array( $format, $wgAdvertisedFeedTypes ) ) {
1129                         $this->mFeedLinks[$format] = $href;
1130                 }
1131         }
1132
1133         /**
1134          * Should we output feed links for this page?
1135          * @return bool
1136          */
1137         public function isSyndicated() {
1138                 return count( $this->mFeedLinks ) > 0;
1139         }
1140
1141         /**
1142          * Return URLs for each supported syndication format for this page.
1143          * @return array associating format keys with URLs
1144          */
1145         public function getSyndicationLinks() {
1146                 return $this->mFeedLinks;
1147         }
1148
1149         /**
1150          * Will currently always return null
1151          *
1152          * @return null
1153          */
1154         public function getFeedAppendQuery() {
1155                 return $this->mFeedLinksAppendQuery;
1156         }
1157
1158         /**
1159          * Set whether the displayed content is related to the source of the
1160          * corresponding article on the wiki
1161          * Setting true will cause the change "article related" toggle to true
1162          *
1163          * @param bool $v
1164          */
1165         public function setArticleFlag( $v ) {
1166                 $this->mIsarticle = $v;
1167                 if ( $v ) {
1168                         $this->mIsArticleRelated = $v;
1169                 }
1170         }
1171
1172         /**
1173          * Return whether the content displayed page is related to the source of
1174          * the corresponding article on the wiki
1175          *
1176          * @return bool
1177          */
1178         public function isArticle() {
1179                 return $this->mIsarticle;
1180         }
1181
1182         /**
1183          * Set whether this page is related an article on the wiki
1184          * Setting false will cause the change of "article flag" toggle to false
1185          *
1186          * @param bool $v
1187          */
1188         public function setArticleRelated( $v ) {
1189                 $this->mIsArticleRelated = $v;
1190                 if ( !$v ) {
1191                         $this->mIsarticle = false;
1192                 }
1193         }
1194
1195         /**
1196          * Return whether this page is related an article on the wiki
1197          *
1198          * @return bool
1199          */
1200         public function isArticleRelated() {
1201                 return $this->mIsArticleRelated;
1202         }
1203
1204         /**
1205          * Add new language links
1206          *
1207          * @param array $newLinkArray Associative array mapping language code to the page
1208          *                      name
1209          */
1210         public function addLanguageLinks( $newLinkArray ) {
1211                 $this->mLanguageLinks += $newLinkArray;
1212         }
1213
1214         /**
1215          * Reset the language links and add new language links
1216          *
1217          * @param array $newLinkArray Associative array mapping language code to the page
1218          *                      name
1219          */
1220         public function setLanguageLinks( $newLinkArray ) {
1221                 $this->mLanguageLinks = $newLinkArray;
1222         }
1223
1224         /**
1225          * Get the list of language links
1226          *
1227          * @return array Array of Interwiki Prefixed (non DB key) Titles (e.g. 'fr:Test page')
1228          */
1229         public function getLanguageLinks() {
1230                 return $this->mLanguageLinks;
1231         }
1232
1233         /**
1234          * Add an array of categories, with names in the keys
1235          *
1236          * @param array $categories mapping category name => sort key
1237          */
1238         public function addCategoryLinks( $categories ) {
1239                 global $wgContLang;
1240
1241                 if ( !is_array( $categories ) || count( $categories ) == 0 ) {
1242                         return;
1243                 }
1244
1245                 # Add the links to a LinkBatch
1246                 $arr = array( NS_CATEGORY => $categories );
1247                 $lb = new LinkBatch;
1248                 $lb->setArray( $arr );
1249
1250                 # Fetch existence plus the hiddencat property
1251                 $dbr = wfGetDB( DB_SLAVE );
1252                 $res = $dbr->select( array( 'page', 'page_props' ),
1253                         array( 'page_id', 'page_namespace', 'page_title', 'page_len',
1254                                 'page_is_redirect', 'page_latest', 'pp_value' ),
1255                         $lb->constructSet( 'page', $dbr ),
1256                         __METHOD__,
1257                         array(),
1258                         array( 'page_props' => array( 'LEFT JOIN', array(
1259                                 'pp_propname' => 'hiddencat',
1260                                 'pp_page = page_id'
1261                         ) ) )
1262                 );
1263
1264                 # Add the results to the link cache
1265                 $lb->addResultToCache( LinkCache::singleton(), $res );
1266
1267                 # Set all the values to 'normal'. This can be done with array_fill_keys in PHP 5.2.0+
1268                 $categories = array_combine(
1269                         array_keys( $categories ),
1270                         array_fill( 0, count( $categories ), 'normal' )
1271                 );
1272
1273                 # Mark hidden categories
1274                 foreach ( $res as $row ) {
1275                         if ( isset( $row->pp_value ) ) {
1276                                 $categories[$row->page_title] = 'hidden';
1277                         }
1278                 }
1279
1280                 # Add the remaining categories to the skin
1281                 if ( wfRunHooks(
1282                         'OutputPageMakeCategoryLinks',
1283                         array( &$this, $categories, &$this->mCategoryLinks ) )
1284                 ) {
1285                         foreach ( $categories as $category => $type ) {
1286                                 $origcategory = $category;
1287                                 $title = Title::makeTitleSafe( NS_CATEGORY, $category );
1288                                 $wgContLang->findVariantLink( $category, $title, true );
1289                                 if ( $category != $origcategory ) {
1290                                         if ( array_key_exists( $category, $categories ) ) {
1291                                                 continue;
1292                                         }
1293                                 }
1294                                 $text = $wgContLang->convertHtml( $title->getText() );
1295                                 $this->mCategories[] = $title->getText();
1296                                 $this->mCategoryLinks[$type][] = Linker::link( $title, $text );
1297                         }
1298                 }
1299         }
1300
1301         /**
1302          * Reset the category links (but not the category list) and add $categories
1303          *
1304          * @param array $categories mapping category name => sort key
1305          */
1306         public function setCategoryLinks( $categories ) {
1307                 $this->mCategoryLinks = array();
1308                 $this->addCategoryLinks( $categories );
1309         }
1310
1311         /**
1312          * Get the list of category links, in a 2-D array with the following format:
1313          * $arr[$type][] = $link, where $type is either "normal" or "hidden" (for
1314          * hidden categories) and $link a HTML fragment with a link to the category
1315          * page
1316          *
1317          * @return array
1318          */
1319         public function getCategoryLinks() {
1320                 return $this->mCategoryLinks;
1321         }
1322
1323         /**
1324          * Get the list of category names this page belongs to
1325          *
1326          * @return array Array of strings
1327          */
1328         public function getCategories() {
1329                 return $this->mCategories;
1330         }
1331
1332         /**
1333          * Do not allow scripts which can be modified by wiki users to load on this page;
1334          * only allow scripts bundled with, or generated by, the software.
1335          */
1336         public function disallowUserJs() {
1337                 $this->reduceAllowedModules(
1338                         ResourceLoaderModule::TYPE_SCRIPTS,
1339                         ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL
1340                 );
1341         }
1342
1343         /**
1344          * Return whether user JavaScript is allowed for this page
1345          * @deprecated since 1.18 Load modules with ResourceLoader, and origin and
1346          *     trustworthiness is identified and enforced automagically.
1347          * @return bool
1348          */
1349         public function isUserJsAllowed() {
1350                 wfDeprecated( __METHOD__, '1.18' );
1351                 return $this->getAllowedModules( ResourceLoaderModule::TYPE_SCRIPTS ) >=
1352                         ResourceLoaderModule::ORIGIN_USER_INDIVIDUAL;
1353         }
1354
1355         /**
1356          * Show what level of JavaScript / CSS untrustworthiness is allowed on this page
1357          * @see ResourceLoaderModule::$origin
1358          * @param string $type ResourceLoaderModule TYPE_ constant
1359          * @return int ResourceLoaderModule ORIGIN_ class constant
1360          */
1361         public function getAllowedModules( $type ) {
1362                 if ( $type == ResourceLoaderModule::TYPE_COMBINED ) {
1363                         return min( array_values( $this->mAllowedModules ) );
1364                 } else {
1365                         return isset( $this->mAllowedModules[$type] )
1366                                 ? $this->mAllowedModules[$type]
1367                                 : ResourceLoaderModule::ORIGIN_ALL;
1368                 }
1369         }
1370
1371         /**
1372          * Set the highest level of CSS/JS untrustworthiness allowed
1373          * @param string $type ResourceLoaderModule TYPE_ constant
1374          * @param int $level ResourceLoaderModule class constant
1375          */
1376         public function setAllowedModules( $type, $level ) {
1377                 $this->mAllowedModules[$type] = $level;
1378         }
1379
1380         /**
1381          * As for setAllowedModules(), but don't inadvertently make the page more accessible
1382          * @param string $type
1383          * @param int $level ResourceLoaderModule class constant
1384          */
1385         public function reduceAllowedModules( $type, $level ) {
1386                 $this->mAllowedModules[$type] = min( $this->getAllowedModules( $type ), $level );
1387         }
1388
1389         /**
1390          * Prepend $text to the body HTML
1391          *
1392          * @param string $text HTML
1393          */
1394         public function prependHTML( $text ) {
1395                 $this->mBodytext = $text . $this->mBodytext;
1396         }
1397
1398         /**
1399          * Append $text to the body HTML
1400          *
1401          * @param string $text HTML
1402          */
1403         public function addHTML( $text ) {
1404                 $this->mBodytext .= $text;
1405         }
1406
1407         /**
1408          * Shortcut for adding an Html::element via addHTML.
1409          *
1410          * @since 1.19
1411          *
1412          * @param string $element
1413          * @param array $attribs
1414          * @param string $contents
1415          */
1416         public function addElement( $element, $attribs = array(), $contents = '' ) {
1417                 $this->addHTML( Html::element( $element, $attribs, $contents ) );
1418         }
1419
1420         /**
1421          * Clear the body HTML
1422          */
1423         public function clearHTML() {
1424                 $this->mBodytext = '';
1425         }
1426
1427         /**
1428          * Get the body HTML
1429          *
1430          * @return string HTML
1431          */
1432         public function getHTML() {
1433                 return $this->mBodytext;
1434         }
1435
1436         /**
1437          * Get/set the ParserOptions object to use for wikitext parsing
1438          *
1439          * @param ParserOptions|null $options Either the ParserOption to use or null to only get the
1440          *   current ParserOption object
1441          * @return ParserOptions
1442          */
1443         public function parserOptions( $options = null ) {
1444                 if ( !$this->mParserOptions ) {
1445                         $this->mParserOptions = ParserOptions::newFromContext( $this->getContext() );
1446                         $this->mParserOptions->setEditSection( false );
1447                 }
1448                 return wfSetVar( $this->mParserOptions, $options );
1449         }
1450
1451         /**
1452          * Set the revision ID which will be seen by the wiki text parser
1453          * for things such as embedded {{REVISIONID}} variable use.
1454          *
1455          * @param int|null $revid An positive integer, or null
1456          * @return mixed Previous value
1457          */
1458         public function setRevisionId( $revid ) {
1459                 $val = is_null( $revid ) ? null : intval( $revid );
1460                 return wfSetVar( $this->mRevisionId, $val );
1461         }
1462
1463         /**
1464          * Get the displayed revision ID
1465          *
1466          * @return int
1467          */
1468         public function getRevisionId() {
1469                 return $this->mRevisionId;
1470         }
1471
1472         /**
1473          * Set the timestamp of the revision which will be displayed. This is used
1474          * to avoid a extra DB call in Skin::lastModified().
1475          *
1476          * @param string|null $timestamp
1477          * @return mixed Previous value
1478          */
1479         public function setRevisionTimestamp( $timestamp ) {
1480                 return wfSetVar( $this->mRevisionTimestamp, $timestamp );
1481         }
1482
1483         /**
1484          * Get the timestamp of displayed revision.
1485          * This will be null if not filled by setRevisionTimestamp().
1486          *
1487          * @return string|null
1488          */
1489         public function getRevisionTimestamp() {
1490                 return $this->mRevisionTimestamp;
1491         }
1492
1493         /**
1494          * Set the displayed file version
1495          *
1496          * @param File|bool $file
1497          * @return mixed Previous value
1498          */
1499         public function setFileVersion( $file ) {
1500                 $val = null;
1501                 if ( $file instanceof File && $file->exists() ) {
1502                         $val = array( 'time' => $file->getTimestamp(), 'sha1' => $file->getSha1() );
1503                 }
1504                 return wfSetVar( $this->mFileVersion, $val, true );
1505         }
1506
1507         /**
1508          * Get the displayed file version
1509          *
1510          * @return array|null ('time' => MW timestamp, 'sha1' => sha1)
1511          */
1512         public function getFileVersion() {
1513                 return $this->mFileVersion;
1514         }
1515
1516         /**
1517          * Get the templates used on this page
1518          *
1519          * @return array (namespace => dbKey => revId)
1520          * @since 1.18
1521          */
1522         public function getTemplateIds() {
1523                 return $this->mTemplateIds;
1524         }
1525
1526         /**
1527          * Get the files used on this page
1528          *
1529          * @return array (dbKey => array('time' => MW timestamp or null, 'sha1' => sha1 or ''))
1530          * @since 1.18
1531          */
1532         public function getFileSearchOptions() {
1533                 return $this->mImageTimeKeys;
1534         }
1535
1536         /**
1537          * Convert wikitext to HTML and add it to the buffer
1538          * Default assumes that the current page title will be used.
1539          *
1540          * @param string $text
1541          * @param bool $linestart Is this the start of a line?
1542          * @param bool $interface Is this text in the user interface language?
1543          */
1544         public function addWikiText( $text, $linestart = true, $interface = true ) {
1545                 $title = $this->getTitle(); // Work around E_STRICT
1546                 if ( !$title ) {
1547                         throw new MWException( 'Title is null' );
1548                 }
1549                 $this->addWikiTextTitle( $text, $title, $linestart, /*tidy*/false, $interface );
1550         }
1551
1552         /**
1553          * Add wikitext with a custom Title object
1554          *
1555          * @param string $text Wikitext
1556          * @param Title $title
1557          * @param bool $linestart Is this the start of a line?
1558          */
1559         public function addWikiTextWithTitle( $text, &$title, $linestart = true ) {
1560                 $this->addWikiTextTitle( $text, $title, $linestart );
1561         }
1562
1563         /**
1564          * Add wikitext with a custom Title object and tidy enabled.
1565          *
1566          * @param string $text Wikitext
1567          * @param Title $title
1568          * @param bool $linestart Is this the start of a line?
1569          */
1570         function addWikiTextTitleTidy( $text, &$title, $linestart = true ) {
1571                 $this->addWikiTextTitle( $text, $title, $linestart, true );
1572         }
1573
1574         /**
1575          * Add wikitext with tidy enabled
1576          *
1577          * @param string $text Wikitext
1578          * @param bool $linestart Is this the start of a line?
1579          */
1580         public function addWikiTextTidy( $text, $linestart = true ) {
1581                 $title = $this->getTitle();
1582                 $this->addWikiTextTitleTidy( $text, $title, $linestart );
1583         }
1584
1585         /**
1586          * Add wikitext with a custom Title object
1587          *
1588          * @param string $text Wikitext
1589          * @param Title $title
1590          * @param bool $linestart Is this the start of a line?
1591          * @param bool $tidy Whether to use tidy
1592          * @param bool $interface Whether it is an interface message
1593          *   (for example disables conversion)
1594          */
1595         public function addWikiTextTitle( $text, Title $title, $linestart,
1596                 $tidy = false, $interface = false
1597         ) {
1598                 global $wgParser;
1599
1600                 wfProfileIn( __METHOD__ );
1601
1602                 $popts = $this->parserOptions();
1603                 $oldTidy = $popts->setTidy( $tidy );
1604                 $popts->setInterfaceMessage( (bool)$interface );
1605
1606                 $parserOutput = $wgParser->parse(
1607                         $text, $title, $popts,
1608                         $linestart, true, $this->mRevisionId
1609                 );
1610
1611                 $popts->setTidy( $oldTidy );
1612
1613                 $this->addParserOutput( $parserOutput );
1614
1615                 wfProfileOut( __METHOD__ );
1616         }
1617
1618         /**
1619          * Add a ParserOutput object, but without Html
1620          *
1621          * @param ParserOutput $parserOutput
1622          */
1623         public function addParserOutputNoText( &$parserOutput ) {
1624                 $this->mLanguageLinks += $parserOutput->getLanguageLinks();
1625                 $this->addCategoryLinks( $parserOutput->getCategories() );
1626                 $this->mNewSectionLink = $parserOutput->getNewSection();
1627                 $this->mHideNewSectionLink = $parserOutput->getHideNewSection();
1628
1629                 $this->mParseWarnings = $parserOutput->getWarnings();
1630                 if ( !$parserOutput->isCacheable() ) {
1631                         $this->enableClientCache( false );
1632                 }
1633                 $this->mNoGallery = $parserOutput->getNoGallery();
1634                 $this->mHeadItems = array_merge( $this->mHeadItems, $parserOutput->getHeadItems() );
1635                 $this->addModules( $parserOutput->getModules() );
1636                 $this->addModuleScripts( $parserOutput->getModuleScripts() );
1637                 $this->addModuleStyles( $parserOutput->getModuleStyles() );
1638                 $this->addModuleMessages( $parserOutput->getModuleMessages() );
1639                 $this->addJsConfigVars( $parserOutput->getJsConfigVars() );
1640
1641                 // Template versioning...
1642                 foreach ( (array)$parserOutput->getTemplateIds() as $ns => $dbks ) {
1643                         if ( isset( $this->mTemplateIds[$ns] ) ) {
1644                                 $this->mTemplateIds[$ns] = $dbks + $this->mTemplateIds[$ns];
1645                         } else {
1646                                 $this->mTemplateIds[$ns] = $dbks;
1647                         }
1648                 }
1649                 // File versioning...
1650                 foreach ( (array)$parserOutput->getFileSearchOptions() as $dbk => $data ) {
1651                         $this->mImageTimeKeys[$dbk] = $data;
1652                 }
1653
1654                 // Hooks registered in the object
1655                 global $wgParserOutputHooks;
1656                 foreach ( $parserOutput->getOutputHooks() as $hookInfo ) {
1657                         list( $hookName, $data ) = $hookInfo;
1658                         if ( isset( $wgParserOutputHooks[$hookName] ) ) {
1659                                 call_user_func( $wgParserOutputHooks[$hookName], $this, $parserOutput, $data );
1660                         }
1661                 }
1662
1663                 // Link flags are ignored for now, but may in the future be
1664                 // used to mark individual language links.
1665                 $linkFlags = array();
1666                 wfRunHooks( 'LanguageLinks', array( $this->getTitle(), &$this->mLanguageLinks, &$linkFlags ) );
1667                 wfRunHooks( 'OutputPageParserOutput', array( &$this, $parserOutput ) );
1668         }
1669
1670         /**
1671          * Add a ParserOutput object
1672          *
1673          * @param ParserOutput $parserOutput
1674          */
1675         function addParserOutput( &$parserOutput ) {
1676                 $this->addParserOutputNoText( $parserOutput );
1677                 $parserOutput->setTOCEnabled( $this->mEnableTOC );
1678
1679                 // Touch section edit links only if not previously disabled
1680                 if ( $parserOutput->getEditSectionTokens() ) {
1681                         $parserOutput->setEditSectionTokens( $this->mEnableSectionEditLinks );
1682                 }
1683                 $text = $parserOutput->getText();
1684                 wfRunHooks( 'OutputPageBeforeHTML', array( &$this, &$text ) );
1685                 $this->addHTML( $text );
1686         }
1687
1688         /**
1689          * Add the output of a QuickTemplate to the output buffer
1690          *
1691          * @param QuickTemplate $template
1692          */
1693         public function addTemplate( &$template ) {
1694                 $this->addHTML( $template->getHTML() );
1695         }
1696
1697         /**
1698          * Parse wikitext and return the HTML.
1699          *
1700          * @param string $text
1701          * @param bool $linestart Is this the start of a line?
1702          * @param bool $interface Use interface language ($wgLang instead of
1703          *   $wgContLang) while parsing language sensitive magic words like GRAMMAR and PLURAL.
1704          *   This also disables LanguageConverter.
1705          * @param Language $language Target language object, will override $interface
1706          * @throws MWException
1707          * @return string HTML
1708          */
1709         public function parse( $text, $linestart = true, $interface = false, $language = null ) {
1710                 global $wgParser;
1711
1712                 if ( is_null( $this->getTitle() ) ) {
1713                         throw new MWException( 'Empty $mTitle in ' . __METHOD__ );
1714                 }
1715
1716                 $popts = $this->parserOptions();
1717                 if ( $interface ) {
1718                         $popts->setInterfaceMessage( true );
1719                 }
1720                 if ( $language !== null ) {
1721                         $oldLang = $popts->setTargetLanguage( $language );
1722                 }
1723
1724                 $parserOutput = $wgParser->parse(
1725                         $text, $this->getTitle(), $popts,
1726                         $linestart, true, $this->mRevisionId
1727                 );
1728
1729                 if ( $interface ) {
1730                         $popts->setInterfaceMessage( false );
1731                 }
1732                 if ( $language !== null ) {
1733                         $popts->setTargetLanguage( $oldLang );
1734                 }
1735
1736                 return $parserOutput->getText();
1737         }
1738
1739         /**
1740          * Parse wikitext, strip paragraphs, and return the HTML.
1741          *
1742          * @param string $text
1743          * @param bool $linestart Is this the start of a line?
1744          * @param bool $interface Use interface language ($wgLang instead of
1745          *   $wgContLang) while parsing language sensitive magic
1746          *   words like GRAMMAR and PLURAL
1747          * @return string HTML
1748          */
1749         public function parseInline( $text, $linestart = true, $interface = false ) {
1750                 $parsed = $this->parse( $text, $linestart, $interface );
1751
1752                 $m = array();
1753                 if ( preg_match( '/^<p>(.*)\n?<\/p>\n?/sU', $parsed, $m ) ) {
1754                         $parsed = $m[1];
1755                 }
1756
1757                 return $parsed;
1758         }
1759
1760         /**
1761          * Set the value of the "s-maxage" part of the "Cache-control" HTTP header
1762          *
1763          * @param int $maxage Maximum cache time on the Squid, in seconds.
1764          */
1765         public function setSquidMaxage( $maxage ) {
1766                 $this->mSquidMaxage = $maxage;
1767         }
1768
1769         /**
1770          * Use enableClientCache(false) to force it to send nocache headers
1771          *
1772          * @param bool $state
1773          *
1774          * @return bool
1775          */
1776         public function enableClientCache( $state ) {
1777                 return wfSetVar( $this->mEnableClientCache, $state );
1778         }
1779
1780         /**
1781          * Get the list of cookies that will influence on the cache
1782          *
1783          * @return array
1784          */
1785         function getCacheVaryCookies() {
1786                 global $wgCookiePrefix, $wgCacheVaryCookies;
1787                 static $cookies;
1788                 if ( $cookies === null ) {
1789                         $cookies = array_merge(
1790                                 array(
1791                                         "{$wgCookiePrefix}Token",
1792                                         "{$wgCookiePrefix}LoggedOut",
1793                                         "forceHTTPS",
1794                                         session_name()
1795                                 ),
1796                                 $wgCacheVaryCookies
1797                         );
1798                         wfRunHooks( 'GetCacheVaryCookies', array( $this, &$cookies ) );
1799                 }
1800                 return $cookies;
1801         }
1802
1803         /**
1804          * Check if the request has a cache-varying cookie header
1805          * If it does, it's very important that we don't allow public caching
1806          *
1807          * @return bool
1808          */
1809         function haveCacheVaryCookies() {
1810                 $cookieHeader = $this->getRequest()->getHeader( 'cookie' );
1811                 if ( $cookieHeader === false ) {
1812                         return false;
1813                 }
1814                 $cvCookies = $this->getCacheVaryCookies();
1815                 foreach ( $cvCookies as $cookieName ) {
1816                         # Check for a simple string match, like the way squid does it
1817                         if ( strpos( $cookieHeader, $cookieName ) !== false ) {
1818                                 wfDebug( __METHOD__ . ": found $cookieName\n" );
1819                                 return true;
1820                         }
1821                 }
1822                 wfDebug( __METHOD__ . ": no cache-varying cookies found\n" );
1823                 return false;
1824         }
1825
1826         /**
1827          * Add an HTTP header that will influence on the cache
1828          *
1829          * @param string $header header name
1830          * @param array|null $option
1831          * @todo FIXME: Document the $option parameter; it appears to be for
1832          *        X-Vary-Options but what format is acceptable?
1833          */
1834         public function addVaryHeader( $header, $option = null ) {
1835                 if ( !array_key_exists( $header, $this->mVaryHeader ) ) {
1836                         $this->mVaryHeader[$header] = (array)$option;
1837                 } elseif ( is_array( $option ) ) {
1838                         if ( is_array( $this->mVaryHeader[$header] ) ) {
1839                                 $this->mVaryHeader[$header] = array_merge( $this->mVaryHeader[$header], $option );
1840                         } else {
1841                                 $this->mVaryHeader[$header] = $option;
1842                         }
1843                 }
1844                 $this->mVaryHeader[$header] = array_unique( (array)$this->mVaryHeader[$header] );
1845         }
1846
1847         /**
1848          * Return a Vary: header on which to vary caches. Based on the keys of $mVaryHeader,
1849          * such as Accept-Encoding or Cookie
1850          *
1851          * @return string
1852          */
1853         public function getVaryHeader() {
1854                 return 'Vary: ' . join( ', ', array_keys( $this->mVaryHeader ) );
1855         }
1856
1857         /**
1858          * Get a complete X-Vary-Options header
1859          *
1860          * @return string
1861          */
1862         public function getXVO() {
1863                 $cvCookies = $this->getCacheVaryCookies();
1864
1865                 $cookiesOption = array();
1866                 foreach ( $cvCookies as $cookieName ) {
1867                         $cookiesOption[] = 'string-contains=' . $cookieName;
1868                 }
1869                 $this->addVaryHeader( 'Cookie', $cookiesOption );
1870
1871                 $headers = array();
1872                 foreach ( $this->mVaryHeader as $header => $option ) {
1873                         $newheader = $header;
1874                         if ( is_array( $option ) && count( $option ) > 0 ) {
1875                                 $newheader .= ';' . implode( ';', $option );
1876                         }
1877                         $headers[] = $newheader;
1878                 }
1879                 $xvo = 'X-Vary-Options: ' . implode( ',', $headers );
1880
1881                 return $xvo;
1882         }
1883
1884         /**
1885          * bug 21672: Add Accept-Language to Vary and XVO headers
1886          * if there's no 'variant' parameter existed in GET.
1887          *
1888          * For example:
1889          *   /w/index.php?title=Main_page should always be served; but
1890          *   /w/index.php?title=Main_page&variant=zh-cn should never be served.
1891          */
1892         function addAcceptLanguage() {
1893                 $lang = $this->getTitle()->getPageLanguage();
1894                 if ( !$this->getRequest()->getCheck( 'variant' ) && $lang->hasVariants() ) {
1895                         $variants = $lang->getVariants();
1896                         $aloption = array();
1897                         foreach ( $variants as $variant ) {
1898                                 if ( $variant === $lang->getCode() ) {
1899                                         continue;
1900                                 } else {
1901                                         $aloption[] = 'string-contains=' . $variant;
1902
1903                                         // IE and some other browsers use BCP 47 standards in
1904                                         // their Accept-Language header, like "zh-CN" or "zh-Hant".
1905                                         // We should handle these too.
1906                                         $variantBCP47 = wfBCP47( $variant );
1907                                         if ( $variantBCP47 !== $variant ) {
1908                                                 $aloption[] = 'string-contains=' . $variantBCP47;
1909                                         }
1910                                 }
1911                         }
1912                         $this->addVaryHeader( 'Accept-Language', $aloption );
1913                 }
1914         }
1915
1916         /**
1917          * Set a flag which will cause an X-Frame-Options header appropriate for
1918          * edit pages to be sent. The header value is controlled by
1919          * $wgEditPageFrameOptions.
1920          *
1921          * This is the default for special pages. If you display a CSRF-protected
1922          * form on an ordinary view page, then you need to call this function.
1923          *
1924          * @param bool $enable
1925          */
1926         public function preventClickjacking( $enable = true ) {
1927                 $this->mPreventClickjacking = $enable;
1928         }
1929
1930         /**
1931          * Turn off frame-breaking. Alias for $this->preventClickjacking(false).
1932          * This can be called from pages which do not contain any CSRF-protected
1933          * HTML form.
1934          */
1935         public function allowClickjacking() {
1936                 $this->mPreventClickjacking = false;
1937         }
1938
1939         /**
1940          * Get the X-Frame-Options header value (without the name part), or false
1941          * if there isn't one. This is used by Skin to determine whether to enable
1942          * JavaScript frame-breaking, for clients that don't support X-Frame-Options.
1943          *
1944          * @return string
1945          */
1946         public function getFrameOptions() {
1947                 global $wgBreakFrames, $wgEditPageFrameOptions;
1948                 if ( $wgBreakFrames ) {
1949                         return 'DENY';
1950                 } elseif ( $this->mPreventClickjacking && $wgEditPageFrameOptions ) {
1951                         return $wgEditPageFrameOptions;
1952                 }
1953                 return false;
1954         }
1955
1956         /**
1957          * Send cache control HTTP headers
1958          */
1959         public function sendCacheControl() {
1960                 global $wgUseSquid, $wgUseESI, $wgUseETag, $wgSquidMaxage, $wgUseXVO;
1961
1962                 $response = $this->getRequest()->response();
1963                 if ( $wgUseETag && $this->mETag ) {
1964                         $response->header( "ETag: $this->mETag" );
1965                 }
1966
1967                 $this->addVaryHeader( 'Cookie' );
1968                 $this->addAcceptLanguage();
1969
1970                 # don't serve compressed data to clients who can't handle it
1971                 # maintain different caches for logged-in users and non-logged in ones
1972                 $response->header( $this->getVaryHeader() );
1973
1974                 if ( $wgUseXVO ) {
1975                         # Add an X-Vary-Options header for Squid with Wikimedia patches
1976                         $response->header( $this->getXVO() );
1977                 }
1978
1979                 if ( $this->mEnableClientCache ) {
1980                         if (
1981                                 $wgUseSquid && session_id() == '' && !$this->isPrintable() &&
1982                                 $this->mSquidMaxage != 0 && !$this->haveCacheVaryCookies()
1983                         ) {
1984                                 if ( $wgUseESI ) {
1985                                         # We'll purge the proxy cache explicitly, but require end user agents
1986                                         # to revalidate against the proxy on each visit.
1987                                         # Surrogate-Control controls our Squid, Cache-Control downstream caches
1988                                         wfDebug( __METHOD__ . ": proxy caching with ESI; {$this->mLastModified} **\n", 'log' );
1989                                         # start with a shorter timeout for initial testing
1990                                         # header( 'Surrogate-Control: max-age=2678400+2678400, content="ESI/1.0"');
1991                                         $response->header( 'Surrogate-Control: max-age=' . $wgSquidMaxage
1992                                                 . '+' . $this->mSquidMaxage . ', content="ESI/1.0"' );
1993                                         $response->header( 'Cache-Control: s-maxage=0, must-revalidate, max-age=0' );
1994                                 } else {
1995                                         # We'll purge the proxy cache for anons explicitly, but require end user agents
1996                                         # to revalidate against the proxy on each visit.
1997                                         # IMPORTANT! The Squid needs to replace the Cache-Control header with
1998                                         # Cache-Control: s-maxage=0, must-revalidate, max-age=0
1999                                         wfDebug( __METHOD__ . ": local proxy caching; {$this->mLastModified} **\n", 'log' );
2000                                         # start with a shorter timeout for initial testing
2001                                         # header( "Cache-Control: s-maxage=2678400, must-revalidate, max-age=0" );
2002                                         $response->header( 'Cache-Control: s-maxage=' . $this->mSquidMaxage
2003                                                 . ', must-revalidate, max-age=0' );
2004                                 }
2005                         } else {
2006                                 # We do want clients to cache if they can, but they *must* check for updates
2007                                 # on revisiting the page.
2008                                 wfDebug( __METHOD__ . ": private caching; {$this->mLastModified} **\n", 'log' );
2009                                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
2010                                 $response->header( "Cache-Control: private, must-revalidate, max-age=0" );
2011                         }
2012                         if ( $this->mLastModified ) {
2013                                 $response->header( "Last-Modified: {$this->mLastModified}" );
2014                         }
2015                 } else {
2016                         wfDebug( __METHOD__ . ": no caching **\n", 'log' );
2017
2018                         # In general, the absence of a last modified header should be enough to prevent
2019                         # the client from using its cache. We send a few other things just to make sure.
2020                         $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
2021                         $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
2022                         $response->header( 'Pragma: no-cache' );
2023                 }
2024         }
2025
2026         /**
2027          * Get the message associated with the HTTP response code $code
2028          *
2029          * @param int $code Status code
2030          * @return string|null Message or null if $code is not in the list of messages
2031          *
2032          * @deprecated since 1.18 Use HttpStatus::getMessage() instead.
2033          */
2034         public static function getStatusMessage( $code ) {
2035                 wfDeprecated( __METHOD__, '1.18' );
2036                 return HttpStatus::getMessage( $code );
2037         }
2038
2039         /**
2040          * Finally, all the text has been munged and accumulated into
2041          * the object, let's actually output it:
2042          */
2043         public function output() {
2044                 global $wgLanguageCode, $wgDebugRedirects, $wgMimeType, $wgVaryOnXFP,
2045                         $wgUseAjax, $wgResponsiveImages;
2046
2047                 if ( $this->mDoNothing ) {
2048                         return;
2049                 }
2050
2051                 wfProfileIn( __METHOD__ );
2052
2053                 $response = $this->getRequest()->response();
2054
2055                 if ( $this->mRedirect != '' ) {
2056                         # Standards require redirect URLs to be absolute
2057                         $this->mRedirect = wfExpandUrl( $this->mRedirect, PROTO_CURRENT );
2058
2059                         $redirect = $this->mRedirect;
2060                         $code = $this->mRedirectCode;
2061
2062                         if ( wfRunHooks( "BeforePageRedirect", array( $this, &$redirect, &$code ) ) ) {
2063                                 if ( $code == '301' || $code == '303' ) {
2064                                         if ( !$wgDebugRedirects ) {
2065                                                 $message = HttpStatus::getMessage( $code );
2066                                                 $response->header( "HTTP/1.1 $code $message" );
2067                                         }
2068                                         $this->mLastModified = wfTimestamp( TS_RFC2822 );
2069                                 }
2070                                 if ( $wgVaryOnXFP ) {
2071                                         $this->addVaryHeader( 'X-Forwarded-Proto' );
2072                                 }
2073                                 $this->sendCacheControl();
2074
2075                                 $response->header( "Content-Type: text/html; charset=utf-8" );
2076                                 if ( $wgDebugRedirects ) {
2077                                         $url = htmlspecialchars( $redirect );
2078                                         print "<html>\n<head>\n<title>Redirect</title>\n</head>\n<body>\n";
2079                                         print "<p>Location: <a href=\"$url\">$url</a></p>\n";
2080                                         print "</body>\n</html>\n";
2081                                 } else {
2082                                         $response->header( 'Location: ' . $redirect );
2083                                 }
2084                         }
2085
2086                         wfProfileOut( __METHOD__ );
2087                         return;
2088                 } elseif ( $this->mStatusCode ) {
2089                         $message = HttpStatus::getMessage( $this->mStatusCode );
2090                         if ( $message ) {
2091                                 $response->header( 'HTTP/1.1 ' . $this->mStatusCode . ' ' . $message );
2092                         }
2093                 }
2094
2095                 # Buffer output; final headers may depend on later processing
2096                 ob_start();
2097
2098                 $response->header( "Content-type: $wgMimeType; charset=UTF-8" );
2099                 $response->header( 'Content-language: ' . $wgLanguageCode );
2100
2101                 // Avoid Internet Explorer "compatibility view" in IE 8-10, so that
2102                 // jQuery etc. can work correctly.
2103                 $response->header( 'X-UA-Compatible: IE=Edge' );
2104
2105                 // Prevent framing, if requested
2106                 $frameOptions = $this->getFrameOptions();
2107                 if ( $frameOptions ) {
2108                         $response->header( "X-Frame-Options: $frameOptions" );
2109                 }
2110
2111                 if ( $this->mArticleBodyOnly ) {
2112                         echo $this->mBodytext;
2113                 } else {
2114
2115                         $sk = $this->getSkin();
2116                         // add skin specific modules
2117                         $modules = $sk->getDefaultModules();
2118
2119                         // enforce various default modules for all skins
2120                         $coreModules = array(
2121                                 // keep this list as small as possible
2122                                 'mediawiki.page.startup',
2123                                 'mediawiki.user',
2124                         );
2125
2126                         // Support for high-density display images if enabled
2127                         if ( $wgResponsiveImages ) {
2128                                 $coreModules[] = 'mediawiki.hidpi';
2129                         }
2130
2131                         $this->addModules( $coreModules );
2132                         foreach ( $modules as $group ) {
2133                                 $this->addModules( $group );
2134                         }
2135                         MWDebug::addModules( $this );
2136                         if ( $wgUseAjax ) {
2137                                 // FIXME: deprecate? - not clear why this is useful
2138                                 wfRunHooks( 'AjaxAddScript', array( &$this ) );
2139                         }
2140
2141                         // Hook that allows last minute changes to the output page, e.g.
2142                         // adding of CSS or Javascript by extensions.
2143                         wfRunHooks( 'BeforePageDisplay', array( &$this, &$sk ) );
2144
2145                         wfProfileIn( 'Output-skin' );
2146                         $sk->outputPage();
2147                         wfProfileOut( 'Output-skin' );
2148                 }
2149
2150                 // This hook allows last minute changes to final overall output by modifying output buffer
2151                 wfRunHooks( 'AfterFinalPageOutput', array( $this ) );
2152
2153                 $this->sendCacheControl();
2154
2155                 ob_end_flush();
2156
2157                 wfProfileOut( __METHOD__ );
2158         }
2159
2160         /**
2161          * Actually output something with print.
2162          *
2163          * @param string $ins the string to output
2164          * @deprecated since 1.22 Use echo yourself.
2165          */
2166         public function out( $ins ) {
2167                 wfDeprecated( __METHOD__, '1.22' );
2168                 print $ins;
2169         }
2170
2171         /**
2172          * Produce a "user is blocked" page.
2173          * @deprecated since 1.18
2174          */
2175         function blockedPage() {
2176                 throw new UserBlockedError( $this->getUser()->mBlock );
2177         }
2178
2179         /**
2180          * Prepare this object to display an error page; disable caching and
2181          * indexing, clear the current text and redirect, set the page's title
2182          * and optionally an custom HTML title (content of the "<title>" tag).
2183          *
2184          * @param string|Message $pageTitle will be passed directly to setPageTitle()
2185          * @param string|Message $htmlTitle will be passed directly to setHTMLTitle();
2186          *                   optional, if not passed the "<title>" attribute will be
2187          *                   based on $pageTitle
2188          */
2189         public function prepareErrorPage( $pageTitle, $htmlTitle = false ) {
2190                 $this->setPageTitle( $pageTitle );
2191                 if ( $htmlTitle !== false ) {
2192                         $this->setHTMLTitle( $htmlTitle );
2193                 }
2194                 $this->setRobotPolicy( 'noindex,nofollow' );
2195                 $this->setArticleRelated( false );
2196                 $this->enableClientCache( false );
2197                 $this->mRedirect = '';
2198                 $this->clearSubtitle();
2199                 $this->clearHTML();
2200         }
2201
2202         /**
2203          * Output a standard error page
2204          *
2205          * showErrorPage( 'titlemsg', 'pagetextmsg' );
2206          * showErrorPage( 'titlemsg', 'pagetextmsg', array( 'param1', 'param2' ) );
2207          * showErrorPage( 'titlemsg', $messageObject );
2208          * showErrorPage( $titleMessageObject, $messageObject );
2209          *
2210          * @param string|Message $title Message key (string) for page title, or a Message object
2211          * @param string|Message $msg Message key (string) for page text, or a Message object
2212          * @param array $params Message parameters; ignored if $msg is a Message object
2213          */
2214         public function showErrorPage( $title, $msg, $params = array() ) {
2215                 if ( !$title instanceof Message ) {
2216                         $title = $this->msg( $title );
2217                 }
2218
2219                 $this->prepareErrorPage( $title );
2220
2221                 if ( $msg instanceof Message ) {
2222                         if ( $params !== array() ) {
2223                                 trigger_error( 'Argument ignored: $params. The message parameters argument '
2224                                         . 'is discarded when the $msg argument is a Message object instead of '
2225                                         . 'a string.', E_USER_NOTICE );
2226                         }
2227                         $this->addHTML( $msg->parseAsBlock() );
2228                 } else {
2229                         $this->addWikiMsgArray( $msg, $params );
2230                 }
2231
2232                 $this->returnToMain();
2233         }
2234
2235         /**
2236          * Output a standard permission error page
2237          *
2238          * @param array $errors error message keys
2239          * @param string $action action that was denied or null if unknown
2240          */
2241         public function showPermissionsErrorPage( $errors, $action = null ) {
2242                 // For some action (read, edit, create and upload), display a "login to do this action"
2243                 // error if all of the following conditions are met:
2244                 // 1. the user is not logged in
2245                 // 2. the only error is insufficient permissions (i.e. no block or something else)
2246                 // 3. the error can be avoided simply by logging in
2247                 if ( in_array( $action, array( 'read', 'edit', 'createpage', 'createtalk', 'upload' ) )
2248                         && $this->getUser()->isAnon() && count( $errors ) == 1 && isset( $errors[0][0] )
2249                         && ( $errors[0][0] == 'badaccess-groups' || $errors[0][0] == 'badaccess-group0' )
2250                         && ( User::groupHasPermission( 'user', $action )
2251                         || User::groupHasPermission( 'autoconfirmed', $action ) )
2252                 ) {
2253                         $displayReturnto = null;
2254
2255                         # Due to bug 32276, if a user does not have read permissions,
2256                         # $this->getTitle() will just give Special:Badtitle, which is
2257                         # not especially useful as a returnto parameter. Use the title
2258                         # from the request instead, if there was one.
2259                         $request = $this->getRequest();
2260                         $returnto = Title::newFromURL( $request->getVal( 'title', '' ) );
2261                         if ( $action == 'edit' ) {
2262                                 $msg = 'whitelistedittext';
2263                                 $displayReturnto = $returnto;
2264                         } elseif ( $action == 'createpage' || $action == 'createtalk' ) {
2265                                 $msg = 'nocreatetext';
2266                         } elseif ( $action == 'upload' ) {
2267                                 $msg = 'uploadnologintext';
2268                         } else { # Read
2269                                 $msg = 'loginreqpagetext';
2270                                 $displayReturnto = Title::newMainPage();
2271                         }
2272
2273                         $query = array();
2274
2275                         if ( $returnto ) {
2276                                 $query['returnto'] = $returnto->getPrefixedText();
2277
2278                                 if ( !$request->wasPosted() ) {
2279                                         $returntoquery = $request->getValues();
2280                                         unset( $returntoquery['title'] );
2281                                         unset( $returntoquery['returnto'] );
2282                                         unset( $returntoquery['returntoquery'] );
2283                                         $query['returntoquery'] = wfArrayToCgi( $returntoquery );
2284                                 }
2285                         }
2286                         $loginLink = Linker::linkKnown(
2287                                 SpecialPage::getTitleFor( 'Userlogin' ),
2288                                 $this->msg( 'loginreqlink' )->escaped(),
2289                                 array(),
2290                                 $query
2291                         );
2292
2293                         $this->prepareErrorPage( $this->msg( 'loginreqtitle' ) );
2294                         $this->addHTML( $this->msg( $msg )->rawParams( $loginLink )->parse() );
2295
2296                         # Don't return to a page the user can't read otherwise
2297                         # we'll end up in a pointless loop
2298                         if ( $displayReturnto && $displayReturnto->userCan( 'read', $this->getUser() ) ) {
2299                                 $this->returnToMain( null, $displayReturnto );
2300                         }
2301                 } else {
2302                         $this->prepareErrorPage( $this->msg( 'permissionserrors' ) );
2303                         $this->addWikiText( $this->formatPermissionsErrorMessage( $errors, $action ) );
2304                 }
2305         }
2306
2307         /**
2308          * Display an error page indicating that a given version of MediaWiki is
2309          * required to use it
2310          *
2311          * @param mixed $version The version of MediaWiki needed to use the page
2312          */
2313         public function versionRequired( $version ) {
2314                 $this->prepareErrorPage( $this->msg( 'versionrequired', $version ) );
2315
2316                 $this->addWikiMsg( 'versionrequiredtext', $version );
2317                 $this->returnToMain();
2318         }
2319
2320         /**
2321          * Display an error page noting that a given permission bit is required.
2322          * @deprecated since 1.18, just throw the exception directly
2323          * @param string $permission key required
2324          * @throws PermissionsError
2325          */
2326         public function permissionRequired( $permission ) {
2327                 throw new PermissionsError( $permission );
2328         }
2329
2330         /**
2331          * Produce the stock "please login to use the wiki" page
2332          *
2333          * @deprecated since 1.19; throw the exception directly
2334          */
2335         public function loginToUse() {
2336                 throw new PermissionsError( 'read' );
2337         }
2338
2339         /**
2340          * Format a list of error messages
2341          *
2342          * @param array $errors Array of arrays returned by Title::getUserPermissionsErrors
2343          * @param string $action Action that was denied or null if unknown
2344          * @return string The wikitext error-messages, formatted into a list.
2345          */
2346         public function formatPermissionsErrorMessage( $errors, $action = null ) {
2347                 if ( $action == null ) {
2348                         $text = $this->msg( 'permissionserrorstext', count( $errors ) )->plain() . "\n\n";
2349                 } else {
2350                         $action_desc = $this->msg( "action-$action" )->plain();
2351                         $text = $this->msg(
2352                                 'permissionserrorstext-withaction',
2353                                 count( $errors ),
2354                                 $action_desc
2355                         )->plain() . "\n\n";
2356                 }
2357
2358                 if ( count( $errors ) > 1 ) {
2359                         $text .= '<ul class="permissions-errors">' . "\n";
2360
2361                         foreach ( $errors as $error ) {
2362                                 $text .= '<li>';
2363                                 $text .= call_user_func_array( array( $this, 'msg' ), $error )->plain();
2364                                 $text .= "</li>\n";
2365                         }
2366                         $text .= '</ul>';
2367                 } else {
2368                         $text .= "<div class=\"permissions-errors\">\n" .
2369                                         call_user_func_array( array( $this, 'msg' ), reset( $errors ) )->plain() .
2370                                         "\n</div>";
2371                 }
2372
2373                 return $text;
2374         }
2375
2376         /**
2377          * Display a page stating that the Wiki is in read-only mode,
2378          * and optionally show the source of the page that the user
2379          * was trying to edit.  Should only be called (for this
2380          * purpose) after wfReadOnly() has returned true.
2381          *
2382          * For historical reasons, this function is _also_ used to
2383          * show the error message when a user tries to edit a page
2384          * they are not allowed to edit.  (Unless it's because they're
2385          * blocked, then we show blockedPage() instead.)  In this
2386          * case, the second parameter should be set to true and a list
2387          * of reasons supplied as the third parameter.
2388          *
2389          * @todo Needs to be split into multiple functions.
2390          *
2391          * @param string $source Source code to show (or null).
2392          * @param bool $protected Is this a permissions error?
2393          * @param array $reasons List of reasons for this error, as returned by
2394          *   Title::getUserPermissionsErrors().
2395          * @param string $action Action that was denied or null if unknown
2396          * @throws ReadOnlyError
2397          */
2398         public function readOnlyPage( $source = null, $protected = false,
2399                 $reasons = array(), $action = null
2400         ) {
2401                 $this->setRobotPolicy( 'noindex,nofollow' );
2402                 $this->setArticleRelated( false );
2403
2404                 // If no reason is given, just supply a default "I can't let you do
2405                 // that, Dave" message.  Should only occur if called by legacy code.
2406                 if ( $protected && empty( $reasons ) ) {
2407                         $reasons[] = array( 'badaccess-group0' );
2408                 }
2409
2410                 if ( !empty( $reasons ) ) {
2411                         // Permissions error
2412                         if ( $source ) {
2413                                 $this->setPageTitle( $this->msg( 'viewsource-title', $this->getTitle()->getPrefixedText() ) );
2414                                 $this->addBacklinkSubtitle( $this->getTitle() );
2415                         } else {
2416                                 $this->setPageTitle( $this->msg( 'badaccess' ) );
2417                         }
2418                         $this->addWikiText( $this->formatPermissionsErrorMessage( $reasons, $action ) );
2419                 } else {
2420                         // Wiki is read only
2421                         throw new ReadOnlyError;
2422                 }
2423
2424                 // Show source, if supplied
2425                 if ( is_string( $source ) ) {
2426                         $this->addWikiMsg( 'viewsourcetext' );
2427
2428                         $pageLang = $this->getTitle()->getPageLanguage();
2429                         $params = array(
2430                                 'id' => 'wpTextbox1',
2431                                 'name' => 'wpTextbox1',
2432                                 'cols' => $this->getUser()->getOption( 'cols' ),
2433                                 'rows' => $this->getUser()->getOption( 'rows' ),
2434                                 'readonly' => 'readonly',
2435                                 'lang' => $pageLang->getHtmlCode(),
2436                                 'dir' => $pageLang->getDir(),
2437                         );
2438                         $this->addHTML( Html::element( 'textarea', $params, $source ) );
2439
2440                         // Show templates used by this article
2441                         $templates = Linker::formatTemplates( $this->getTitle()->getTemplateLinksFrom() );
2442                         $this->addHTML( "<div class='templatesUsed'>
2443 $templates
2444 </div>
2445 " );
2446                 }
2447
2448                 # If the title doesn't exist, it's fairly pointless to print a return
2449                 # link to it.  After all, you just tried editing it and couldn't, so
2450                 # what's there to do there?
2451                 if ( $this->getTitle()->exists() ) {
2452                         $this->returnToMain( null, $this->getTitle() );
2453                 }
2454         }
2455
2456         /**
2457          * Turn off regular page output and return an error response
2458          * for when rate limiting has triggered.
2459          */
2460         public function rateLimited() {
2461                 throw new ThrottledError;
2462         }
2463
2464         /**
2465          * Show a warning about slave lag
2466          *
2467          * If the lag is higher than $wgSlaveLagCritical seconds,
2468          * then the warning is a bit more obvious. If the lag is
2469          * lower than $wgSlaveLagWarning, then no warning is shown.
2470          *
2471          * @param int $lag Slave lag
2472          */
2473         public function showLagWarning( $lag ) {
2474                 global $wgSlaveLagWarning, $wgSlaveLagCritical;
2475                 if ( $lag >= $wgSlaveLagWarning ) {
2476                         $message = $lag < $wgSlaveLagCritical
2477                                 ? 'lag-warn-normal'
2478                                 : 'lag-warn-high';
2479                         $wrap = Html::rawElement( 'div', array( 'class' => "mw-{$message}" ), "\n$1\n" );
2480                         $this->wrapWikiMsg( "$wrap\n", array( $message, $this->getLanguage()->formatNum( $lag ) ) );
2481                 }
2482         }
2483
2484         public function showFatalError( $message ) {
2485                 $this->prepareErrorPage( $this->msg( 'internalerror' ) );
2486
2487                 $this->addHTML( $message );
2488         }
2489
2490         public function showUnexpectedValueError( $name, $val ) {
2491                 $this->showFatalError( $this->msg( 'unexpected', $name, $val )->text() );
2492         }
2493
2494         public function showFileCopyError( $old, $new ) {
2495                 $this->showFatalError( $this->msg( 'filecopyerror', $old, $new )->text() );
2496         }
2497
2498         public function showFileRenameError( $old, $new ) {
2499                 $this->showFatalError( $this->msg( 'filerenameerror', $old, $new )->text() );
2500         }
2501
2502         public function showFileDeleteError( $name ) {
2503                 $this->showFatalError( $this->msg( 'filedeleteerror', $name )->text() );
2504         }
2505
2506         public function showFileNotFoundError( $name ) {
2507                 $this->showFatalError( $this->msg( 'filenotfound', $name )->text() );
2508         }
2509
2510         /**
2511          * Add a "return to" link pointing to a specified title
2512          *
2513          * @param Title $title Title to link
2514          * @param array $query Query string parameters
2515          * @param string $text Text of the link (input is not escaped)
2516          * @param array $options Options array to pass to Linker
2517          */
2518         public function addReturnTo( $title, $query = array(), $text = null, $options = array() ) {
2519                 $link = $this->msg( 'returnto' )->rawParams(
2520                         Linker::link( $title, $text, array(), $query, $options ) )->escaped();
2521                 $this->addHTML( "<p id=\"mw-returnto\">{$link}</p>\n" );
2522         }
2523
2524         /**
2525          * Add a "return to" link pointing to a specified title,
2526          * or the title indicated in the request, or else the main page
2527          *
2528          * @param mixed $unused
2529          * @param Title|string $returnto Title or String to return to
2530          * @param string $returntoquery Query string for the return to link
2531          */
2532         public function returnToMain( $unused = null, $returnto = null, $returntoquery = null ) {
2533                 if ( $returnto == null ) {
2534                         $returnto = $this->getRequest()->getText( 'returnto' );
2535                 }
2536
2537                 if ( $returntoquery == null ) {
2538                         $returntoquery = $this->getRequest()->getText( 'returntoquery' );
2539                 }
2540
2541                 if ( $returnto === '' ) {
2542                         $returnto = Title::newMainPage();
2543                 }
2544
2545                 if ( is_object( $returnto ) ) {
2546                         $titleObj = $returnto;
2547                 } else {
2548                         $titleObj = Title::newFromText( $returnto );
2549                 }
2550                 if ( !is_object( $titleObj ) ) {
2551                         $titleObj = Title::newMainPage();
2552                 }
2553
2554                 $this->addReturnTo( $titleObj, wfCgiToArray( $returntoquery ) );
2555         }
2556
2557         /**
2558          * @param Skin $sk The given Skin
2559          * @param bool $includeStyle Unused
2560          * @return string The doctype, opening "<html>", and head element.
2561          */
2562         public function headElement( Skin $sk, $includeStyle = true ) {
2563                 global $wgContLang, $wgMimeType;
2564
2565                 $userdir = $this->getLanguage()->getDir();
2566                 $sitedir = $wgContLang->getDir();
2567
2568                 $ret = Html::htmlHeader( $sk->getHtmlElementAttributes() );
2569
2570                 if ( $this->getHTMLTitle() == '' ) {
2571                         $this->setHTMLTitle( $this->msg( 'pagetitle', $this->getPageTitle() )->inContentLanguage() );
2572                 }
2573
2574                 $openHead = Html::openElement( 'head' );
2575                 if ( $openHead ) {
2576                         # Don't bother with the newline if $head == ''
2577                         $ret .= "$openHead\n";
2578                 }
2579
2580                 if ( !Html::isXmlMimeType( $wgMimeType ) ) {
2581                         // Add <meta charset="UTF-8">
2582                         // This should be before <title> since it defines the charset used by
2583                         // text including the text inside <title>.
2584                         // The spec recommends defining XHTML5's charset using the XML declaration
2585                         // instead of meta.
2586                         // Our XML declaration is output by Html::htmlHeader.
2587                         // http://www.whatwg.org/html/semantics.html#attr-meta-http-equiv-content-type
2588                         // http://www.whatwg.org/html/semantics.html#charset
2589                         $ret .= Html::element( 'meta', array( 'charset' => 'UTF-8' ) ) . "\n";
2590                 }
2591
2592                 $ret .= Html::element( 'title', null, $this->getHTMLTitle() ) . "\n";
2593
2594                 $ret .= (
2595                         $this->getHeadLinks() .
2596                         "\n" .
2597                         $this->buildCssLinks() .
2598                         // No newline after buildCssLinks since makeResourceLoaderLink did that already
2599                         $this->getHeadScripts() .
2600                         "\n" .
2601                         $this->getHeadItems()
2602                 );
2603
2604                 $closeHead = Html::closeElement( 'head' );
2605                 if ( $closeHead ) {
2606                         $ret .= "$closeHead\n";
2607                 }
2608
2609                 $bodyClasses = array();
2610                 $bodyClasses[] = 'mediawiki';
2611
2612                 # Classes for LTR/RTL directionality support
2613                 $bodyClasses[] = $userdir;
2614                 $bodyClasses[] = "sitedir-$sitedir";
2615
2616                 if ( $this->getLanguage()->capitalizeAllNouns() ) {
2617                         # A <body> class is probably not the best way to do this . . .
2618                         $bodyClasses[] = 'capitalize-all-nouns';
2619                 }
2620
2621                 $bodyClasses[] = $sk->getPageClasses( $this->getTitle() );
2622                 $bodyClasses[] = 'skin-' . Sanitizer::escapeClass( $sk->getSkinName() );
2623                 $bodyClasses[] =
2624                         'action-' . Sanitizer::escapeClass( Action::getActionName( $this->getContext() ) );
2625
2626                 $bodyAttrs = array();
2627                 // While the implode() is not strictly needed, it's used for backwards compatibility
2628                 // (this used to be built as a string and hooks likely still expect that).
2629                 $bodyAttrs['class'] = implode( ' ', $bodyClasses );
2630
2631                 // Allow skins and extensions to add body attributes they need
2632                 $sk->addToBodyAttributes( $this, $bodyAttrs );
2633                 wfRunHooks( 'OutputPageBodyAttributes', array( $this, $sk, &$bodyAttrs ) );
2634
2635                 $ret .= Html::openElement( 'body', $bodyAttrs ) . "\n";
2636
2637                 return $ret;
2638         }
2639
2640         /**
2641          * Get a ResourceLoader object associated with this OutputPage
2642          *
2643          * @return ResourceLoader
2644          */
2645         public function getResourceLoader() {
2646                 if ( is_null( $this->mResourceLoader ) ) {
2647                         $this->mResourceLoader = new ResourceLoader();
2648                 }
2649                 return $this->mResourceLoader;
2650         }
2651
2652         /**
2653          * @todo Document
2654          * @param array|string $modules One or more module names
2655          * @param string $only ResourceLoaderModule TYPE_ class constant
2656          * @param bool $useESI
2657          * @param array $extraQuery Array with extra query parameters to add to each
2658          *   request. array( param => value ).
2659          * @param bool $loadCall If true, output an (asynchronous) mw.loader.load()
2660          *   call rather than a "<script src='...'>" tag.
2661          * @return string The html "<script>", "<link>" and "<style>" tags
2662          */
2663         protected function makeResourceLoaderLink( $modules, $only, $useESI = false,
2664                 array $extraQuery = array(), $loadCall = false
2665         ) {
2666                 global $wgResourceLoaderUseESI;
2667
2668                 $modules = (array)$modules;
2669
2670                 $links = array(
2671                         'html' => '',
2672                         'states' => array(),
2673                 );
2674
2675                 if ( !count( $modules ) ) {
2676                         return $links;
2677                 }
2678
2679                 if ( count( $modules ) > 1 ) {
2680                         // Remove duplicate module requests
2681                         $modules = array_unique( $modules );
2682                         // Sort module names so requests are more uniform
2683                         sort( $modules );
2684
2685                         if ( ResourceLoader::inDebugMode() ) {
2686                                 // Recursively call us for every item
2687                                 foreach ( $modules as $name ) {
2688                                         $link = $this->makeResourceLoaderLink( $name, $only, $useESI );
2689                                         $links['html'] .= $link['html'];
2690                                         $links['states'] += $link['states'];
2691                                 }
2692                                 return $links;
2693                         }
2694                 }
2695
2696                 if ( !is_null( $this->mTarget ) ) {
2697                         $extraQuery['target'] = $this->mTarget;
2698                 }
2699
2700                 // Create keyed-by-group list of module objects from modules list
2701                 $groups = array();
2702                 $resourceLoader = $this->getResourceLoader();
2703                 foreach ( $modules as $name ) {
2704                         $module = $resourceLoader->getModule( $name );
2705                         # Check that we're allowed to include this module on this page
2706                         if ( !$module
2707                                 || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_SCRIPTS )
2708                                         && $only == ResourceLoaderModule::TYPE_SCRIPTS )
2709                                 || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_STYLES )
2710                                         && $only == ResourceLoaderModule::TYPE_STYLES )
2711                                 || ( $this->mTarget && !in_array( $this->mTarget, $module->getTargets() ) )
2712                         ) {
2713                                 continue;
2714                         }
2715
2716                         $group = $module->getGroup();
2717                         if ( !isset( $groups[$group] ) ) {
2718                                 $groups[$group] = array();
2719                         }
2720                         $groups[$group][$name] = $module;
2721                 }
2722
2723                 foreach ( $groups as $group => $grpModules ) {
2724                         // Special handling for user-specific groups
2725                         $user = null;
2726                         if ( ( $group === 'user' || $group === 'private' ) && $this->getUser()->isLoggedIn() ) {
2727                                 $user = $this->getUser()->getName();
2728                         }
2729
2730                         // Create a fake request based on the one we are about to make so modules return
2731                         // correct timestamp and emptiness data
2732                         $query = ResourceLoader::makeLoaderQuery(
2733                                 array(), // modules; not determined yet
2734                                 $this->getLanguage()->getCode(),
2735                                 $this->getSkin()->getSkinName(),
2736                                 $user,
2737                                 null, // version; not determined yet
2738                                 ResourceLoader::inDebugMode(),
2739                                 $only === ResourceLoaderModule::TYPE_COMBINED ? null : $only,
2740                                 $this->isPrintable(),
2741                                 $this->getRequest()->getBool( 'handheld' ),
2742                                 $extraQuery
2743                         );
2744                         $context = new ResourceLoaderContext( $resourceLoader, new FauxRequest( $query ) );
2745
2746                         // Extract modules that know they're empty
2747                         foreach ( $grpModules as $key => $module ) {
2748                                 // Inline empty modules: since they're empty, just mark them as 'ready' (bug 46857)
2749                                 // If we're only getting the styles, we don't need to do anything for empty modules.
2750                                 if ( $module->isKnownEmpty( $context ) ) {
2751                                         unset( $grpModules[$key] );
2752                                         if ( $only !== ResourceLoaderModule::TYPE_STYLES ) {
2753                                                 $links['states'][$key] = 'ready';
2754                                         }
2755                                 }
2756                         }
2757
2758                         // If there are no non-empty modules, skip this group
2759                         if ( count( $grpModules ) === 0 ) {
2760                                 continue;
2761                         }
2762
2763                         // Inline private modules. These can't be loaded through load.php for security
2764                         // reasons, see bug 34907. Note that these modules should be loaded from
2765                         // getHeadScripts() before the first loader call. Otherwise other modules can't
2766                         // properly use them as dependencies (bug 30914)
2767                         if ( $group === 'private' ) {
2768                                 if ( $only == ResourceLoaderModule::TYPE_STYLES ) {
2769                                         $links['html'] .= Html::inlineStyle(
2770                                                 $resourceLoader->makeModuleResponse( $context, $grpModules )
2771                                         );
2772                                 } else {
2773                                         $links['html'] .= Html::inlineScript(
2774                                                 ResourceLoader::makeLoaderConditionalScript(
2775                                                         $resourceLoader->makeModuleResponse( $context, $grpModules )
2776                                                 )
2777                                         );
2778                                 }
2779                                 $links['html'] .= "\n";
2780                                 continue;
2781                         }
2782
2783                         // Special handling for the user group; because users might change their stuff
2784                         // on-wiki like user pages, or user preferences; we need to find the highest
2785                         // timestamp of these user-changeable modules so we can ensure cache misses on change
2786                         // This should NOT be done for the site group (bug 27564) because anons get that too
2787                         // and we shouldn't be putting timestamps in Squid-cached HTML
2788                         $version = null;
2789                         if ( $group === 'user' ) {
2790                                 // Get the maximum timestamp
2791                                 $timestamp = 1;
2792                                 foreach ( $grpModules as $module ) {
2793                                         $timestamp = max( $timestamp, $module->getModifiedTime( $context ) );
2794                                 }
2795                                 // Add a version parameter so cache will break when things change
2796                                 $version = wfTimestamp( TS_ISO_8601_BASIC, $timestamp );
2797                         }
2798
2799                         $url = ResourceLoader::makeLoaderURL(
2800                                 array_keys( $grpModules ),
2801                                 $this->getLanguage()->getCode(),
2802                                 $this->getSkin()->getSkinName(),
2803                                 $user,
2804                                 $version,
2805                                 ResourceLoader::inDebugMode(),
2806                                 $only === ResourceLoaderModule::TYPE_COMBINED ? null : $only,
2807                                 $this->isPrintable(),
2808                                 $this->getRequest()->getBool( 'handheld' ),
2809                                 $extraQuery
2810                         );
2811                         if ( $useESI && $wgResourceLoaderUseESI ) {
2812                                 $esi = Xml::element( 'esi:include', array( 'src' => $url ) );
2813                                 if ( $only == ResourceLoaderModule::TYPE_STYLES ) {
2814                                         $link = Html::inlineStyle( $esi );
2815                                 } else {
2816                                         $link = Html::inlineScript( $esi );
2817                                 }
2818                         } else {
2819                                 // Automatically select style/script elements
2820                                 if ( $only === ResourceLoaderModule::TYPE_STYLES ) {
2821                                         $link = Html::linkedStyle( $url );
2822                                 } elseif ( $loadCall ) {
2823                                         $link = Html::inlineScript(
2824                                                 ResourceLoader::makeLoaderConditionalScript(
2825                                                         Xml::encodeJsCall( 'mw.loader.load', array( $url, 'text/javascript', true ) )
2826                                                 )
2827                                         );
2828                                 } else {
2829                                         $link = Html::linkedScript( $url );
2830
2831                                         // For modules requested directly in the html via <link> or <script>,
2832                                         // tell mw.loader they are being loading to prevent duplicate requests.
2833                                         foreach ( $grpModules as $key => $module ) {
2834                                                 // Don't output state=loading for the startup module..
2835                                                 if ( $key !== 'startup' ) {
2836                                                         $links['states'][$key] = 'loading';
2837                                                 }
2838                                         }
2839                                 }
2840                         }
2841
2842                         if ( $group == 'noscript' ) {
2843                                 $links['html'] .= Html::rawElement( 'noscript', array(), $link ) . "\n";
2844                         } else {
2845                                 $links['html'] .= $link . "\n";
2846                         }
2847                 }
2848
2849                 return $links;
2850         }
2851
2852         /**
2853          * Build html output from an array of links from makeResourceLoaderLink.
2854          * @param array $links
2855          * @return string HTML
2856          */
2857         protected static function getHtmlFromLoaderLinks( Array $links ) {
2858                 $html = '';
2859                 $states = array();
2860                 foreach ( $links as $link ) {
2861                         if ( !is_array( $link ) ) {
2862                                 $html .= $link;
2863                         } else {
2864                                 $html .= $link['html'];
2865                                 $states += $link['states'];
2866                         }
2867                 }
2868
2869                 if ( count( $states ) ) {
2870                         $html = Html::inlineScript(
2871                                 ResourceLoader::makeLoaderConditionalScript(
2872                                         ResourceLoader::makeLoaderStateScript( $states )
2873                                 )
2874                         ) . "\n" . $html;
2875                 }
2876
2877                 return $html;
2878         }
2879
2880         /**
2881          * JS stuff to put in the "<head>". This is the startup module, config
2882          * vars and modules marked with position 'top'
2883          *
2884          * @return string HTML fragment
2885          */
2886         function getHeadScripts() {
2887                 global $wgResourceLoaderExperimentalAsyncLoading;
2888
2889                 // Startup - this will immediately load jquery and mediawiki modules
2890                 $links = array();
2891                 $links[] = $this->makeResourceLoaderLink( 'startup', ResourceLoaderModule::TYPE_SCRIPTS, true );
2892
2893                 // Load config before anything else
2894                 $links[] = Html::inlineScript(
2895                         ResourceLoader::makeLoaderConditionalScript(
2896                                 ResourceLoader::makeConfigSetScript( $this->getJSVars() )
2897                         )
2898                 );
2899
2900                 // Load embeddable private modules before any loader links
2901                 // This needs to be TYPE_COMBINED so these modules are properly wrapped
2902                 // in mw.loader.implement() calls and deferred until mw.user is available
2903                 $embedScripts = array( 'user.options', 'user.tokens' );
2904                 $links[] = $this->makeResourceLoaderLink( $embedScripts, ResourceLoaderModule::TYPE_COMBINED );
2905
2906                 // Scripts and messages "only" requests marked for top inclusion
2907                 // Messages should go first
2908                 $links[] = $this->makeResourceLoaderLink(
2909                         $this->getModuleMessages( true, 'top' ),
2910                         ResourceLoaderModule::TYPE_MESSAGES
2911                 );
2912                 $links[] = $this->makeResourceLoaderLink(
2913                         $this->getModuleScripts( true, 'top' ),
2914                         ResourceLoaderModule::TYPE_SCRIPTS
2915                 );
2916
2917                 // Modules requests - let the client calculate dependencies and batch requests as it likes
2918                 // Only load modules that have marked themselves for loading at the top
2919                 $modules = $this->getModules( true, 'top' );
2920                 if ( $modules ) {
2921                         $links[] = Html::inlineScript(
2922                                 ResourceLoader::makeLoaderConditionalScript(
2923                                         Xml::encodeJsCall( 'mw.loader.load', array( $modules ) )
2924                                 )
2925                         );
2926                 }
2927
2928                 if ( $wgResourceLoaderExperimentalAsyncLoading ) {
2929                         $links[] = $this->getScriptsForBottomQueue( true );
2930                 }
2931
2932                 return self::getHtmlFromLoaderLinks( $links );
2933         }
2934
2935         /**
2936          * JS stuff to put at the 'bottom', which can either be the bottom of the
2937          * "<body>" or the bottom of the "<head>" depending on
2938          * $wgResourceLoaderExperimentalAsyncLoading: modules marked with position
2939          * 'bottom', legacy scripts ($this->mScripts), user preferences, site JS
2940          * and user JS.
2941          *
2942          * @param bool $inHead If true, this HTML goes into the "<head>",
2943          *   if false it goes into the "<body>".
2944          * @return string
2945          */
2946         function getScriptsForBottomQueue( $inHead ) {
2947                 global $wgUseSiteJs, $wgAllowUserJs;
2948
2949                 // Scripts and messages "only" requests marked for bottom inclusion
2950                 // If we're in the <head>, use load() calls rather than <script src="..."> tags
2951                 // Messages should go first
2952                 $links = array();
2953                 $links[] = $this->makeResourceLoaderLink( $this->getModuleMessages( true, 'bottom' ),
2954                         ResourceLoaderModule::TYPE_MESSAGES, /* $useESI = */ false, /* $extraQuery = */ array(),
2955                         /* $loadCall = */ $inHead
2956                 );
2957                 $links[] = $this->makeResourceLoaderLink( $this->getModuleScripts( true, 'bottom' ),
2958                         ResourceLoaderModule::TYPE_SCRIPTS, /* $useESI = */ false, /* $extraQuery = */ array(),
2959                         /* $loadCall = */ $inHead
2960                 );
2961
2962                 // Modules requests - let the client calculate dependencies and batch requests as it likes
2963                 // Only load modules that have marked themselves for loading at the bottom
2964                 $modules = $this->getModules( true, 'bottom' );
2965                 if ( $modules ) {
2966                         $links[] = Html::inlineScript(
2967                                 ResourceLoader::makeLoaderConditionalScript(
2968                                         Xml::encodeJsCall( 'mw.loader.load', array( $modules, null, true ) )
2969                                 )
2970                         );
2971                 }
2972
2973                 // Legacy Scripts
2974                 $links[] = "\n" . $this->mScripts;
2975
2976                 // Add site JS if enabled
2977                 $links[] = $this->makeResourceLoaderLink( 'site', ResourceLoaderModule::TYPE_SCRIPTS,
2978                         /* $useESI = */ false, /* $extraQuery = */ array(), /* $loadCall = */ $inHead
2979                 );
2980
2981                 // Add user JS if enabled
2982                 if ( $wgAllowUserJs
2983                         && $this->getUser()->isLoggedIn()
2984                         && $this->getTitle()
2985                         && $this->getTitle()->isJsSubpage()
2986                         && $this->userCanPreview()
2987                 ) {
2988                         # XXX: additional security check/prompt?
2989                         // We're on a preview of a JS subpage
2990                         // Exclude this page from the user module in case it's in there (bug 26283)
2991                         $links[] = $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_SCRIPTS, false,
2992                                 array( 'excludepage' => $this->getTitle()->getPrefixedDBkey() ), $inHead
2993                         );
2994                         // Load the previewed JS
2995                         $links[] = Html::inlineScript( "\n"
2996                                         . $this->getRequest()->getText( 'wpTextbox1' ) . "\n" ) . "\n";
2997
2998                         // FIXME: If the user is previewing, say, ./vector.js, his ./common.js will be loaded
2999                         // asynchronously and may arrive *after* the inline script here. So the previewed code
3000                         // may execute before ./common.js runs. Normally, ./common.js runs before ./vector.js...
3001                 } else {
3002                         // Include the user module normally, i.e., raw to avoid it being wrapped in a closure.
3003                         $links[] = $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_SCRIPTS,
3004                                 /* $useESI = */ false, /* $extraQuery = */ array(), /* $loadCall = */ $inHead
3005                         );
3006                 }
3007
3008                 // Group JS is only enabled if site JS is enabled.
3009                 $links[] = $this->makeResourceLoaderLink( 'user.groups', ResourceLoaderModule::TYPE_COMBINED,
3010                         /* $useESI = */ false, /* $extraQuery = */ array(), /* $loadCall = */ $inHead
3011                 );
3012
3013                 return self::getHtmlFromLoaderLinks( $links );
3014         }
3015
3016         /**
3017          * JS stuff to put at the bottom of the "<body>"
3018          * @return string
3019          */
3020         function getBottomScripts() {
3021                 global $wgResourceLoaderExperimentalAsyncLoading;
3022
3023                 // Optimise jQuery ready event cross-browser.
3024                 // This also enforces $.isReady to be true at </body> which fixes the
3025                 // mw.loader bug in Firefox with using document.write between </body>
3026                 // and the DOMContentReady event (bug 47457).
3027                 $html = Html::inlineScript( 'window.jQuery && jQuery.ready();' );
3028
3029                 if ( !$wgResourceLoaderExperimentalAsyncLoading ) {
3030                         $html .= $this->getScriptsForBottomQueue( false );
3031                 }
3032
3033                 return $html;
3034         }
3035
3036         /**
3037          * Get the javascript config vars to include on this page
3038          *
3039          * @return array Array of javascript config vars
3040          * @since 1.23
3041          */
3042         public function getJsConfigVars() {
3043                 return $this->mJsConfigVars;
3044         }
3045
3046         /**
3047          * Add one or more variables to be set in mw.config in JavaScript
3048          *
3049          * @param string|array $keys Key or array of key/value pairs
3050          * @param mixed $value [optional] Value of the configuration variable
3051          */
3052         public function addJsConfigVars( $keys, $value = null ) {
3053                 if ( is_array( $keys ) ) {
3054                         foreach ( $keys as $key => $value ) {
3055                                 $this->mJsConfigVars[$key] = $value;
3056                         }
3057                         return;
3058                 }
3059
3060                 $this->mJsConfigVars[$keys] = $value;
3061         }
3062
3063         /**
3064          * Get an array containing the variables to be set in mw.config in JavaScript.
3065          *
3066          * DO NOT CALL THIS FROM OUTSIDE OF THIS CLASS OR Skin::makeGlobalVariablesScript().
3067          * This is only public until that function is removed. You have been warned.
3068          *
3069          * Do not add things here which can be evaluated in ResourceLoaderStartUpModule
3070          * - in other words, page-independent/site-wide variables (without state).
3071          * You will only be adding bloat to the html page and causing page caches to
3072          * have to be purged on configuration changes.
3073          * @return array
3074          */
3075         public function getJSVars() {
3076                 global $wgContLang;
3077
3078                 $curRevisionId = 0;
3079                 $articleId = 0;
3080                 $canonicalSpecialPageName = false; # bug 21115
3081
3082                 $title = $this->getTitle();
3083                 $ns = $title->getNamespace();
3084                 $canonicalNamespace = MWNamespace::exists( $ns )
3085                         ? MWNamespace::getCanonicalName( $ns )
3086                         : $title->getNsText();
3087
3088                 $sk = $this->getSkin();
3089                 // Get the relevant title so that AJAX features can use the correct page name
3090                 // when making API requests from certain special pages (bug 34972).
3091                 $relevantTitle = $sk->getRelevantTitle();
3092                 $relevantUser = $sk->getRelevantUser();
3093
3094                 if ( $ns == NS_SPECIAL ) {
3095                         list( $canonicalSpecialPageName, /*...*/ ) =
3096                                 SpecialPageFactory::resolveAlias( $title->getDBkey() );
3097                 } elseif ( $this->canUseWikiPage() ) {
3098                         $wikiPage = $this->getWikiPage();
3099                         $curRevisionId = $wikiPage->getLatest();
3100                         $articleId = $wikiPage->getId();
3101                 }
3102
3103                 $lang = $title->getPageLanguage();
3104
3105                 // Pre-process information
3106                 $separatorTransTable = $lang->separatorTransformTable();
3107                 $separatorTransTable = $separatorTransTable ? $separatorTransTable : array();
3108                 $compactSeparatorTransTable = array(
3109                         implode( "\t", array_keys( $separatorTransTable ) ),
3110                         implode( "\t", $separatorTransTable ),
3111                 );
3112                 $digitTransTable = $lang->digitTransformTable();
3113                 $digitTransTable = $digitTransTable ? $digitTransTable : array();
3114                 $compactDigitTransTable = array(
3115                         implode( "\t", array_keys( $digitTransTable ) ),
3116                         implode( "\t", $digitTransTable ),
3117                 );
3118
3119                 $user = $this->getUser();
3120
3121                 $vars = array(
3122                         'wgCanonicalNamespace' => $canonicalNamespace,
3123                         'wgCanonicalSpecialPageName' => $canonicalSpecialPageName,
3124                         'wgNamespaceNumber' => $title->getNamespace(),
3125                         'wgPageName' => $title->getPrefixedDBkey(),
3126                         'wgTitle' => $title->getText(),
3127                         'wgCurRevisionId' => $curRevisionId,
3128                         'wgRevisionId' => (int)$this->getRevisionId(),
3129                         'wgArticleId' => $articleId,
3130                         'wgIsArticle' => $this->isArticle(),
3131                         'wgIsRedirect' => $title->isRedirect(),
3132                         'wgAction' => Action::getActionName( $this->getContext() ),
3133                         'wgUserName' => $user->isAnon() ? null : $user->getName(),
3134                         'wgUserGroups' => $user->getEffectiveGroups(),
3135                         'wgCategories' => $this->getCategories(),
3136                         'wgBreakFrames' => $this->getFrameOptions() == 'DENY',
3137                         'wgPageContentLanguage' => $lang->getCode(),
3138                         'wgPageContentModel' => $title->getContentModel(),
3139                         'wgSeparatorTransformTable' => $compactSeparatorTransTable,
3140                         'wgDigitTransformTable' => $compactDigitTransTable,
3141                         'wgDefaultDateFormat' => $lang->getDefaultDateFormat(),
3142                         'wgMonthNames' => $lang->getMonthNamesArray(),
3143                         'wgMonthNamesShort' => $lang->getMonthAbbreviationsArray(),
3144                         'wgRelevantPageName' => $relevantTitle->getPrefixedDBkey(),
3145                 );
3146
3147                 if ( $user->isLoggedIn() ) {
3148                         $vars['wgUserId'] = $user->getId();
3149                         $vars['wgUserEditCount'] = $user->getEditCount();
3150                         $userReg = wfTimestampOrNull( TS_UNIX, $user->getRegistration() );
3151                         $vars['wgUserRegistration'] = $userReg !== null ? ( $userReg * 1000 ) : null;
3152                         // Get the revision ID of the oldest new message on the user's talk
3153                         // page. This can be used for constructing new message alerts on
3154                         // the client side.
3155                         $vars['wgUserNewMsgRevisionId'] = $user->getNewMessageRevisionId();
3156                 }
3157
3158                 if ( $wgContLang->hasVariants() ) {
3159                         $vars['wgUserVariant'] = $wgContLang->getPreferredVariant();
3160                 }
3161                 // Same test as SkinTemplate
3162                 $vars['wgIsProbablyEditable'] = $title->quickUserCan( 'edit', $user )
3163                         && ( $title->exists() || $title->quickUserCan( 'create', $user ) );
3164
3165                 foreach ( $title->getRestrictionTypes() as $type ) {
3166                         $vars['wgRestriction' . ucfirst( $type )] = $title->getRestrictions( $type );
3167                 }
3168
3169                 if ( $title->isMainPage() ) {
3170                         $vars['wgIsMainPage'] = true;
3171                 }
3172
3173                 if ( $this->mRedirectedFrom ) {
3174                         $vars['wgRedirectedFrom'] = $this->mRedirectedFrom->getPrefixedDBkey();
3175                 }
3176
3177                 if ( $relevantUser ) {
3178                         $vars['wgRelevantUserName'] = $relevantUser->getName();
3179                 }
3180
3181                 // Allow extensions to add their custom variables to the mw.config map.
3182                 // Use the 'ResourceLoaderGetConfigVars' hook if the variable is not
3183                 // page-dependant but site-wide (without state).
3184                 // Alternatively, you may want to use OutputPage->addJsConfigVars() instead.
3185                 wfRunHooks( 'MakeGlobalVariablesScript', array( &$vars, $this ) );
3186
3187                 // Merge in variables from addJsConfigVars last
3188                 return array_merge( $vars, $this->getJsConfigVars() );
3189         }
3190
3191         /**
3192          * To make it harder for someone to slip a user a fake
3193          * user-JavaScript or user-CSS preview, a random token
3194          * is associated with the login session. If it's not
3195          * passed back with the preview request, we won't render
3196          * the code.
3197          *
3198          * @return bool
3199          */
3200         public function userCanPreview() {
3201                 if ( $this->getRequest()->getVal( 'action' ) != 'submit'
3202                         || !$this->getRequest()->wasPosted()
3203                         || !$this->getUser()->matchEditToken(
3204                                 $this->getRequest()->getVal( 'wpEditToken' ) )
3205                 ) {
3206                         return false;
3207                 }
3208                 if ( !$this->getTitle()->isJsSubpage() && !$this->getTitle()->isCssSubpage() ) {
3209                         return false;
3210                 }
3211
3212                 return !count( $this->getTitle()->getUserPermissionsErrors( 'edit', $this->getUser() ) );
3213         }
3214
3215         /**
3216          * @return array in format "link name or number => 'link html'".
3217          */
3218         public function getHeadLinksArray() {
3219                 global $wgUniversalEditButton, $wgFavicon, $wgAppleTouchIcon, $wgEnableAPI,
3220                         $wgSitename, $wgVersion,
3221                         $wgFeed, $wgOverrideSiteFeed, $wgAdvertisedFeedTypes,
3222                         $wgDisableLangConversion, $wgCanonicalLanguageLinks,
3223                         $wgRightsPage, $wgRightsUrl;
3224
3225                 $tags = array();
3226
3227                 $canonicalUrl = $this->mCanonicalUrl;
3228
3229                 $tags['meta-generator'] = Html::element( 'meta', array(
3230                         'name' => 'generator',
3231                         'content' => "MediaWiki $wgVersion",
3232                 ) );
3233
3234                 $p = "{$this->mIndexPolicy},{$this->mFollowPolicy}";
3235                 if ( $p !== 'index,follow' ) {
3236                         // http://www.robotstxt.org/wc/meta-user.html
3237                         // Only show if it's different from the default robots policy
3238                         $tags['meta-robots'] = Html::element( 'meta', array(
3239                                 'name' => 'robots',
3240                                 'content' => $p,
3241                         ) );
3242                 }
3243
3244                 foreach ( $this->mMetatags as $tag ) {
3245                         if ( 0 == strcasecmp( 'http:', substr( $tag[0], 0, 5 ) ) ) {
3246                                 $a = 'http-equiv';
3247                                 $tag[0] = substr( $tag[0], 5 );
3248                         } else {
3249                                 $a = 'name';
3250                         }
3251                         $tagName = "meta-{$tag[0]}";
3252                         if ( isset( $tags[$tagName] ) ) {
3253                                 $tagName .= $tag[1];
3254                         }
3255                         $tags[$tagName] = Html::element( 'meta',
3256                                 array(
3257                                         $a => $tag[0],
3258                                         'content' => $tag[1]
3259                                 )
3260                         );
3261                 }
3262
3263                 foreach ( $this->mLinktags as $tag ) {
3264                         $tags[] = Html::element( 'link', $tag );
3265                 }
3266
3267                 # Universal edit button
3268                 if ( $wgUniversalEditButton && $this->isArticleRelated() ) {
3269                         $user = $this->getUser();
3270                         if ( $this->getTitle()->quickUserCan( 'edit', $user )
3271                                 && ( $this->getTitle()->exists() || $this->getTitle()->quickUserCan( 'create', $user ) ) ) {
3272                                 // Original UniversalEditButton
3273                                 $msg = $this->msg( 'edit' )->text();
3274                                 $tags['universal-edit-button'] = Html::element( 'link', array(
3275                                         'rel' => 'alternate',
3276                                         'type' => 'application/x-wiki',
3277                                         'title' => $msg,
3278                                         'href' => $this->getTitle()->getLocalURL( 'action=edit' )
3279                                 ) );
3280                                 // Alternate edit link
3281                                 $tags['alternative-edit'] = Html::element( 'link', array(
3282                                         'rel' => 'edit',
3283                                         'title' => $msg,
3284                                         'href' => $this->getTitle()->getLocalURL( 'action=edit' )
3285                                 ) );
3286                         }
3287                 }
3288
3289                 # Generally the order of the favicon and apple-touch-icon links
3290                 # should not matter, but Konqueror (3.5.9 at least) incorrectly
3291                 # uses whichever one appears later in the HTML source. Make sure
3292                 # apple-touch-icon is specified first to avoid this.
3293                 if ( $wgAppleTouchIcon !== false ) {
3294                         $tags['apple-touch-icon'] = Html::element( 'link', array(
3295                                 'rel' => 'apple-touch-icon',
3296                                 'href' => $wgAppleTouchIcon
3297                         ) );
3298                 }
3299
3300                 if ( $wgFavicon !== false ) {
3301                         $tags['favicon'] = Html::element( 'link', array(
3302                                 'rel' => 'shortcut icon',
3303                                 'href' => $wgFavicon
3304                         ) );
3305                 }
3306
3307                 # OpenSearch description link
3308                 $tags['opensearch'] = Html::element( 'link', array(
3309                         'rel' => 'search',
3310                         'type' => 'application/opensearchdescription+xml',
3311                         'href' => wfScript( 'opensearch_desc' ),
3312                         'title' => $this->msg( 'opensearch-desc' )->inContentLanguage()->text(),
3313                 ) );
3314
3315                 if ( $wgEnableAPI ) {
3316                         # Real Simple Discovery link, provides auto-discovery information
3317                         # for the MediaWiki API (and potentially additional custom API
3318                         # support such as WordPress or Twitter-compatible APIs for a
3319                         # blogging extension, etc)
3320                         $tags['rsd'] = Html::element( 'link', array(
3321                                 'rel' => 'EditURI',
3322                                 'type' => 'application/rsd+xml',
3323                                 // Output a protocol-relative URL here if $wgServer is protocol-relative
3324                                 // Whether RSD accepts relative or protocol-relative URLs is completely undocumented, though
3325                                 'href' => wfExpandUrl( wfAppendQuery(
3326                                         wfScript( 'api' ),
3327                                         array( 'action' => 'rsd' ) ),
3328                                         PROTO_RELATIVE
3329                                 ),
3330                         ) );
3331                 }
3332
3333                 # Language variants
3334                 if ( !$wgDisableLangConversion && $wgCanonicalLanguageLinks ) {
3335                         $lang = $this->getTitle()->getPageLanguage();
3336                         if ( $lang->hasVariants() ) {
3337
3338                                 $urlvar = $lang->getURLVariant();
3339
3340                                 if ( !$urlvar ) {
3341                                         $variants = $lang->getVariants();
3342                                         foreach ( $variants as $_v ) {
3343                                                 $tags["variant-$_v"] = Html::element( 'link', array(
3344                                                         'rel' => 'alternate',
3345                                                         'hreflang' => wfBCP47( $_v ),
3346                                                         'href' => $this->getTitle()->getLocalURL( array( 'variant' => $_v ) ) )
3347                                                 );
3348                                         }
3349                                 } else {
3350                                         $canonicalUrl = $this->getTitle()->getLocalURL();
3351                                 }
3352                         }
3353                 }
3354
3355                 # Copyright
3356                 $copyright = '';
3357                 if ( $wgRightsPage ) {
3358                         $copy = Title::newFromText( $wgRightsPage );
3359
3360                         if ( $copy ) {
3361                                 $copyright = $copy->getLocalURL();
3362                         }
3363                 }
3364
3365                 if ( !$copyright && $wgRightsUrl ) {
3366                         $copyright = $wgRightsUrl;
3367                 }
3368
3369                 if ( $copyright ) {
3370                         $tags['copyright'] = Html::element( 'link', array(
3371                                 'rel' => 'copyright',
3372                                 'href' => $copyright )
3373                         );
3374                 }
3375
3376                 # Feeds
3377                 if ( $wgFeed ) {
3378                         foreach ( $this->getSyndicationLinks() as $format => $link ) {
3379                                 # Use the page name for the title.  In principle, this could
3380                                 # lead to issues with having the same name for different feeds
3381                                 # corresponding to the same page, but we can't avoid that at
3382                                 # this low a level.
3383
3384                                 $tags[] = $this->feedLink(
3385                                         $format,
3386                                         $link,
3387                                         # Used messages: 'page-rss-feed' and 'page-atom-feed' (for an easier grep)
3388                                         $this->msg( "page-{$format}-feed", $this->getTitle()->getPrefixedText() )->text()
3389                                 );
3390                         }
3391
3392                         # Recent changes feed should appear on every page (except recentchanges,
3393                         # that would be redundant). Put it after the per-page feed to avoid
3394                         # changing existing behavior. It's still available, probably via a
3395                         # menu in your browser. Some sites might have a different feed they'd
3396                         # like to promote instead of the RC feed (maybe like a "Recent New Articles"
3397                         # or "Breaking news" one). For this, we see if $wgOverrideSiteFeed is defined.
3398                         # If so, use it instead.
3399                         if ( $wgOverrideSiteFeed ) {
3400                                 foreach ( $wgOverrideSiteFeed as $type => $feedUrl ) {
3401                                         // Note, this->feedLink escapes the url.
3402                                         $tags[] = $this->feedLink(
3403                                                 $type,
3404                                                 $feedUrl,
3405                                                 $this->msg( "site-{$type}-feed", $wgSitename )->text()
3406                                         );
3407                                 }
3408                         } elseif ( !$this->getTitle()->isSpecial( 'Recentchanges' ) ) {
3409                                 $rctitle = SpecialPage::getTitleFor( 'Recentchanges' );
3410                                 foreach ( $wgAdvertisedFeedTypes as $format ) {
3411                                         $tags[] = $this->feedLink(
3412                                                 $format,
3413                                                 $rctitle->getLocalURL( array( 'feed' => $format ) ),
3414                                                 # For grep: 'site-rss-feed', 'site-atom-feed'
3415                                                 $this->msg( "site-{$format}-feed", $wgSitename )->text()
3416                                         );
3417                                 }
3418                         }
3419                 }
3420
3421                 # Canonical URL
3422                 global $wgEnableCanonicalServerLink;
3423                 if ( $wgEnableCanonicalServerLink ) {
3424                         if ( $canonicalUrl !== false ) {
3425                                 $canonicalUrl = wfExpandUrl( $canonicalUrl, PROTO_CANONICAL );
3426                         } else {
3427                                 $reqUrl = $this->getRequest()->getRequestURL();
3428                                 $canonicalUrl = wfExpandUrl( $reqUrl, PROTO_CANONICAL );
3429                         }
3430                 }
3431                 if ( $canonicalUrl !== false ) {
3432                         $tags[] = Html::element( 'link', array(
3433                                 'rel' => 'canonical',
3434                                 'href' => $canonicalUrl
3435                         ) );
3436                 }
3437
3438                 return $tags;
3439         }
3440
3441         /**
3442          * @return string HTML tag links to be put in the header.
3443          */
3444         public function getHeadLinks() {
3445                 return implode( "\n", $this->getHeadLinksArray() );
3446         }
3447
3448         /**
3449          * Generate a "<link rel/>" for a feed.
3450          *
3451          * @param string $type Feed type
3452          * @param string $url URL to the feed
3453          * @param string $text Value of the "title" attribute
3454          * @return string HTML fragment
3455          */
3456         private function feedLink( $type, $url, $text ) {
3457                 return Html::element( 'link', array(
3458                         'rel' => 'alternate',
3459                         'type' => "application/$type+xml",
3460                         'title' => $text,
3461                         'href' => $url )
3462                 );
3463         }
3464
3465         /**
3466          * Add a local or specified stylesheet, with the given media options.
3467          * Meant primarily for internal use...
3468          *
3469          * @param string $style URL to the file
3470          * @param string $media to specify a media type, 'screen', 'printable', 'handheld' or any.
3471          * @param string $condition for IE conditional comments, specifying an IE version
3472          * @param string $dir set to 'rtl' or 'ltr' for direction-specific sheets
3473          */
3474         public function addStyle( $style, $media = '', $condition = '', $dir = '' ) {
3475                 $options = array();
3476                 // Even though we expect the media type to be lowercase, but here we
3477                 // force it to lowercase to be safe.
3478                 if ( $media ) {
3479                         $options['media'] = $media;
3480                 }
3481                 if ( $condition ) {
3482                         $options['condition'] = $condition;
3483                 }
3484                 if ( $dir ) {
3485                         $options['dir'] = $dir;
3486                 }
3487                 $this->styles[$style] = $options;
3488         }
3489
3490         /**
3491          * Adds inline CSS styles
3492          * @param mixed $style_css Inline CSS
3493          * @param string $flip Set to 'flip' to flip the CSS if needed
3494          */
3495         public function addInlineStyle( $style_css, $flip = 'noflip' ) {
3496                 if ( $flip === 'flip' && $this->getLanguage()->isRTL() ) {
3497                         # If wanted, and the interface is right-to-left, flip the CSS
3498                         $style_css = CSSJanus::transform( $style_css, true, false );
3499                 }
3500                 $this->mInlineStyles .= Html::inlineStyle( $style_css ) . "\n";
3501         }
3502
3503         /**
3504          * Build a set of "<link>" elements for the stylesheets specified in the $this->styles array.
3505          * These will be applied to various media & IE conditionals.
3506          *
3507          * @return string
3508          */
3509         public function buildCssLinks() {
3510                 global $wgUseSiteCss, $wgAllowUserCss, $wgAllowUserCssPrefs, $wgContLang;
3511
3512                 $this->getSkin()->setupSkinUserCss( $this );
3513
3514                 // Add ResourceLoader styles
3515                 // Split the styles into these groups
3516                 $styles = array(
3517                         'other' => array(),
3518                         'user' => array(),
3519                         'site' => array(),
3520                         'private' => array(),
3521                         'noscript' => array()
3522                 );
3523                 $links = array();
3524                 $otherTags = ''; // Tags to append after the normal <link> tags
3525                 $resourceLoader = $this->getResourceLoader();
3526
3527                 $moduleStyles = $this->getModuleStyles();
3528
3529                 // Per-site custom styles
3530                 $moduleStyles[] = 'site';
3531                 $moduleStyles[] = 'noscript';
3532                 $moduleStyles[] = 'user.groups';
3533
3534                 // Per-user custom styles
3535                 if ( $wgAllowUserCss && $this->getTitle()->isCssSubpage() && $this->userCanPreview() ) {
3536                         // We're on a preview of a CSS subpage
3537                         // Exclude this page from the user module in case it's in there (bug 26283)
3538                         $link = $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_STYLES, false,
3539                                 array( 'excludepage' => $this->getTitle()->getPrefixedDBkey() )
3540                         );
3541                         $otherTags .= $link['html'];
3542
3543                         // Load the previewed CSS
3544                         // If needed, Janus it first. This is user-supplied CSS, so it's
3545                         // assumed to be right for the content language directionality.
3546                         $previewedCSS = $this->getRequest()->getText( 'wpTextbox1' );
3547                         if ( $this->getLanguage()->getDir() !== $wgContLang->getDir() ) {
3548                                 $previewedCSS = CSSJanus::transform( $previewedCSS, true, false );
3549                         }
3550                         $otherTags .= Html::inlineStyle( $previewedCSS ) . "\n";
3551                 } else {
3552                         // Load the user styles normally
3553                         $moduleStyles[] = 'user';
3554                 }
3555
3556                 // Per-user preference styles
3557                 $moduleStyles[] = 'user.cssprefs';
3558
3559                 foreach ( $moduleStyles as $name ) {
3560                         $module = $resourceLoader->getModule( $name );
3561                         if ( !$module ) {
3562                                 continue;
3563                         }
3564                         $group = $module->getGroup();
3565                         // Modules in groups different than the ones listed on top (see $styles assignment)
3566                         // will be placed in the "other" group
3567                         $styles[ isset( $styles[$group] ) ? $group : 'other' ][] = $name;
3568                 }
3569
3570                 // We want site, private and user styles to override dynamically added
3571                 // styles from modules, but we want dynamically added styles to override
3572                 // statically added styles from other modules. So the order has to be
3573                 // other, dynamic, site, private, user. Add statically added styles for
3574                 // other modules
3575                 $links[] = $this->makeResourceLoaderLink( $styles['other'], ResourceLoaderModule::TYPE_STYLES );
3576                 // Add normal styles added through addStyle()/addInlineStyle() here
3577                 $links[] = implode( "\n", $this->buildCssLinksArray() ) . $this->mInlineStyles;
3578                 // Add marker tag to mark the place where the client-side loader should inject dynamic styles
3579                 // We use a <meta> tag with a made-up name for this because that's valid HTML
3580                 $links[] = Html::element(
3581                         'meta',
3582                         array( 'name' => 'ResourceLoaderDynamicStyles', 'content' => '' )
3583                 ) . "\n";
3584
3585                 // Add site, private and user styles
3586                 // 'private' at present only contains user.options, so put that before 'user'
3587                 // Any future private modules will likely have a similar user-specific character
3588                 foreach ( array( 'site', 'noscript', 'private', 'user' ) as $group ) {
3589                         $links[] = $this->makeResourceLoaderLink( $styles[$group],
3590                                 ResourceLoaderModule::TYPE_STYLES
3591                         );
3592                 }
3593
3594                 // Add stuff in $otherTags (previewed user CSS if applicable)
3595                 return self::getHtmlFromLoaderLinks( $links ) . $otherTags;
3596         }
3597
3598         /**
3599          * @return array
3600          */
3601         public function buildCssLinksArray() {
3602                 $links = array();
3603
3604                 // Add any extension CSS
3605                 foreach ( $this->mExtStyles as $url ) {
3606                         $this->addStyle( $url );
3607                 }
3608                 $this->mExtStyles = array();
3609
3610                 foreach ( $this->styles as $file => $options ) {
3611                         $link = $this->styleLink( $file, $options );
3612                         if ( $link ) {
3613                                 $links[$file] = $link;
3614                         }
3615                 }
3616                 return $links;
3617         }
3618
3619         /**
3620          * Generate \<link\> tags for stylesheets
3621          *
3622          * @param string $style URL to the file
3623          * @param array $options Option, can contain 'condition', 'dir', 'media' keys
3624          * @return string HTML fragment
3625          */
3626         protected function styleLink( $style, $options ) {
3627                 if ( isset( $options['dir'] ) ) {
3628                         if ( $this->getLanguage()->getDir() != $options['dir'] ) {
3629                                 return '';
3630                         }
3631                 }
3632
3633                 if ( isset( $options['media'] ) ) {
3634                         $media = self::transformCssMedia( $options['media'] );
3635                         if ( is_null( $media ) ) {
3636                                 return '';
3637                         }
3638                 } else {
3639                         $media = 'all';
3640                 }
3641
3642                 if ( substr( $style, 0, 1 ) == '/' ||
3643                         substr( $style, 0, 5 ) == 'http:' ||
3644                         substr( $style, 0, 6 ) == 'https:' ) {
3645                         $url = $style;
3646                 } else {
3647                         global $wgStylePath, $wgStyleVersion;
3648                         $url = $wgStylePath . '/' . $style . '?' . $wgStyleVersion;
3649                 }
3650
3651                 $link = Html::linkedStyle( $url, $media );
3652
3653                 if ( isset( $options['condition'] ) ) {
3654                         $condition = htmlspecialchars( $options['condition'] );
3655                         $link = "<!--[if $condition]>$link<![endif]-->";
3656                 }
3657                 return $link;
3658         }
3659
3660         /**
3661          * Transform "media" attribute based on request parameters
3662          *
3663          * @param string $media Current value of the "media" attribute
3664          * @return string Modified value of the "media" attribute, or null to skip
3665          * this stylesheet
3666          */
3667         public static function transformCssMedia( $media ) {
3668                 global $wgRequest;
3669
3670                 // http://www.w3.org/TR/css3-mediaqueries/#syntax
3671                 $screenMediaQueryRegex = '/^(?:only\s+)?screen\b/i';
3672
3673                 // Switch in on-screen display for media testing
3674                 $switches = array(
3675                         'printable' => 'print',
3676                         'handheld' => 'handheld',
3677                 );
3678                 foreach ( $switches as $switch => $targetMedia ) {
3679                         if ( $wgRequest->getBool( $switch ) ) {
3680                                 if ( $media == $targetMedia ) {
3681                                         $media = '';
3682                                 } elseif ( preg_match( $screenMediaQueryRegex, $media ) === 1 ) {
3683                                         // This regex will not attempt to understand a comma-separated media_query_list
3684                                         //
3685                                         // Example supported values for $media:
3686                                         // 'screen', 'only screen', 'screen and (min-width: 982px)' ),
3687                                         // Example NOT supported value for $media:
3688                                         // '3d-glasses, screen, print and resolution > 90dpi'
3689                                         //
3690                                         // If it's a print request, we never want any kind of screen stylesheets
3691                                         // If it's a handheld request (currently the only other choice with a switch),
3692                                         // we don't want simple 'screen' but we might want screen queries that
3693                                         // have a max-width or something, so we'll pass all others on and let the
3694                                         // client do the query.
3695                                         if ( $targetMedia == 'print' || $media == 'screen' ) {
3696                                                 return null;
3697                                         }
3698                                 }
3699                         }
3700                 }
3701
3702                 return $media;
3703         }
3704
3705         /**
3706          * Add a wikitext-formatted message to the output.
3707          * This is equivalent to:
3708          *
3709          *    $wgOut->addWikiText( wfMessage( ... )->plain() )
3710          */
3711         public function addWikiMsg( /*...*/ ) {
3712                 $args = func_get_args();
3713                 $name = array_shift( $args );
3714                 $this->addWikiMsgArray( $name, $args );
3715         }
3716
3717         /**
3718          * Add a wikitext-formatted message to the output.
3719          * Like addWikiMsg() except the parameters are taken as an array
3720          * instead of a variable argument list.
3721          *
3722          * @param string $name
3723          * @param array $args
3724          */
3725         public function addWikiMsgArray( $name, $args ) {
3726                 $this->addHTML( $this->msg( $name, $args )->parseAsBlock() );
3727         }
3728
3729         /**
3730          * This function takes a number of message/argument specifications, wraps them in
3731          * some overall structure, and then parses the result and adds it to the output.
3732          *
3733          * In the $wrap, $1 is replaced with the first message, $2 with the second, and so
3734          * on. The subsequent arguments may either be strings, in which case they are the
3735          * message names, or arrays, in which case the first element is the message name,
3736          * and subsequent elements are the parameters to that message.
3737          *
3738          * Don't use this for messages that are not in users interface language.
3739          *
3740          * For example:
3741          *
3742          *    $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>", 'some-error' );
3743          *
3744          * Is equivalent to:
3745          *
3746          *    $wgOut->addWikiText( "<div class='error'>\n"
3747          *        . wfMessage( 'some-error' )->plain() . "\n</div>" );
3748          *
3749          * The newline after opening div is needed in some wikitext. See bug 19226.
3750          *
3751          * @param string $wrap
3752          */
3753         public function wrapWikiMsg( $wrap /*, ...*/ ) {
3754                 $msgSpecs = func_get_args();
3755                 array_shift( $msgSpecs );
3756                 $msgSpecs = array_values( $msgSpecs );
3757                 $s = $wrap;
3758                 foreach ( $msgSpecs as $n => $spec ) {
3759                         if ( is_array( $spec ) ) {
3760                                 $args = $spec;
3761                                 $name = array_shift( $args );
3762                                 if ( isset( $args['options'] ) ) {
3763                                         unset( $args['options'] );
3764                                         wfDeprecated(
3765                                                 'Adding "options" to ' . __METHOD__ . ' is no longer supported',
3766                                                 '1.20'
3767                                         );
3768                                 }
3769                         } else {
3770                                 $args = array();
3771                                 $name = $spec;
3772                         }
3773                         $s = str_replace( '$' . ( $n + 1 ), $this->msg( $name, $args )->plain(), $s );
3774                 }
3775                 $this->addWikiText( $s );
3776         }
3777
3778         /**
3779          * Include jQuery core. Use this to avoid loading it multiple times
3780          * before we get a usable script loader.
3781          *
3782          * @param array $modules List of jQuery modules which should be loaded
3783          * @return array The list of modules which were not loaded.
3784          * @since 1.16
3785          * @deprecated since 1.17
3786          */
3787         public function includeJQuery( $modules = array() ) {
3788                 return array();
3789         }
3790
3791         /**
3792          * Enables/disables TOC, doesn't override __NOTOC__
3793          * @param bool $flag
3794          * @since 1.22
3795          */
3796         public function enableTOC( $flag = true ) {
3797                 $this->mEnableTOC = $flag;
3798         }
3799
3800         /**
3801          * @return bool
3802          * @since 1.22
3803          */
3804         public function isTOCEnabled() {
3805                 return $this->mEnableTOC;
3806         }
3807
3808         /**
3809          * Enables/disables section edit links, doesn't override __NOEDITSECTION__
3810          * @param bool $flag
3811          * @since 1.23
3812          */
3813         public function enableSectionEditLinks( $flag = true ) {
3814                 $this->mEnableSectionEditLinks = $flag;
3815         }
3816
3817         /**
3818          * @return bool
3819          * @since 1.23
3820          */
3821         public function sectionEditLinksEnabled() {
3822                 return $this->mEnableSectionEditLinks;
3823         }
3824 }