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         /// Should be private. Used with addMeta() which adds "<meta>"
  40         var $mMetatags = array();
  41
  42         var $mLinktags = array();
  43         var $mCanonicalUrl = false;
  44
  45         /// Additional stylesheets. Looks like this is for extensions. Might be replaced by resource loader.
  46         var $mExtStyles = array();
  47
  48         /// Should be private - has getter and setter. Contains the HTML title
  49         var $mPagetitle = '';
  50
  51         /// Contains all of the "<body>" content. Should be private we got set/get accessors and the append() method.
  52         var $mBodytext = '';
  53
  54         /**
  55          * Holds the debug lines that will be output as comments in page source if
  56          * $wgDebugComments is enabled. See also $wgShowDebug.
  57          * @deprecated since 1.20; use MWDebug class instead.
  58          */
  59         public $mDebugtext = '';
  60
  61         /// Should be private. Stores contents of "<title>" tag
  62         var $mHTMLtitle = '';
  63
  64         /// Should be private. Is the displayed content related to the source of the corresponding wiki article.
  65         var $mIsarticle = false;
  66
  67         /**
  68          * Should be private. Has get/set methods properly documented.
  69          * Stores "article flag" toggle.
  70          */
  71         var $mIsArticleRelated = true;
  72
  73         /**
  74          * Should be private. We have to set isPrintable(). Some pages should
  75          * never be printed (ex: redirections).
  76          */
  77         var $mPrintable = false;
  78
  79         /**
  80          * Should be private. We have set/get/append methods.
  81          *
  82          * Contains the page subtitle. Special pages usually have some links here.
  83          * Don't confuse with site subtitle added by skins.
  84          */
  85         private $mSubtitle = array();
  86
  87         var $mRedirect = '';
  88         var $mStatusCode;
  89
  90         /**
  91          * mLastModified and mEtag are used for sending cache control.
  92          * The whole caching system should probably be moved into its own class.
  93          */
  94         var $mLastModified = '';
  95
  96         /**
  97          * Should be private. No getter but used in sendCacheControl();
  98          * Contains an HTTP Entity Tags (see RFC 2616 section 3.13) which is used
  99          * as a unique identifier for the content. It is later used by the client
 100          * to compare its cached version with the server version. Client sends
 101          * headers If-Match and If-None-Match containing its locally cached ETAG value.
 102          *
 103          * To get more information, you will have to look at HTTP/1.1 protocol which
 104          * is properly described in RFC 2616 : http://tools.ietf.org/html/rfc2616
 105          */
 106         var $mETag = false;
 107
 108         var $mCategoryLinks = array();
 109         var $mCategories = array();
 110
 111         /// Should be private. Array of Interwiki Prefixed (non DB key) Titles (e.g. 'fr:Test page')
 112         var $mLanguageLinks = array();
 113
 114         /**
 115          * Should be private. Used for JavaScript (pre resource loader)
 116          * We should split js / css.
 117          * mScripts content is inserted as is in "<head>" by Skin. This might
 118          * contains either a link to a stylesheet or inline css.
 119          */
 120         var $mScripts = '';
 121
 122         /**
 123          * Inline CSS styles. Use addInlineStyle() sparingly
 124          */
 125         var $mInlineStyles = '';
 126
 127         //
 128         var $mLinkColours;
 129
 130         /**
 131          * Used by skin template.
 132          * Example: $tpl->set( 'displaytitle', $out->mPageLinkTitle );
 133          */
 134         var $mPageLinkTitle = '';
 135
 136         /// Array of elements in "<head>". Parser might add its own headers!
 137         var $mHeadItems = array();
 138
 139         // @todo FIXME: Next variables probably comes from the resource loader
 140         var $mModules = array(), $mModuleScripts = array(), $mModuleStyles = array(), $mModuleMessages = array();
 141         var $mResourceLoader;
 142         var $mJsConfigVars = array();
 143
 144         /** @todo FIXME: Is this still used ?*/
 145         var $mInlineMsg = array();
 146
 147         var $mTemplateIds = array();
 148         var $mImageTimeKeys = array();
 149
 150         var $mRedirectCode = '';
 151
 152         var $mFeedLinksAppendQuery = null;
 153
 154         # What level of 'untrustworthiness' is allowed in CSS/JS modules loaded on this page?
 155         # @see ResourceLoaderModule::$origin
 156         # ResourceLoaderModule::ORIGIN_ALL is assumed unless overridden;
 157         protected $mAllowedModules = array(
 158                 ResourceLoaderModule::TYPE_COMBINED => ResourceLoaderModule::ORIGIN_ALL,
 159         );
 160
 161         /**
 162          * @EasterEgg I just love the name for this self documenting variable.
 163          * @todo document
 164          */
 165         var $mDoNothing = false;
 166
 167         // Parser related.
 168         var $mContainsOldMagic = 0, $mContainsNewMagic = 0;
 169
 170         /**
 171          * lazy initialised, use parserOptions()
 172          * @var ParserOptions
 173          */
 174         protected $mParserOptions = null;
 175
 176         /**
 177          * Handles the atom / rss links.
 178          * We probably only support atom in 2011.
 179          * Looks like a private variable.
 180          * @see $wgAdvertisedFeedTypes
 181          */
 182         var $mFeedLinks = array();
 183
 184         // Gwicke work on squid caching? Roughly from 2003.
 185         var $mEnableClientCache = true;
 186
 187         /**
 188          * Flag if output should only contain the body of the article.
 189          * Should be private.
 190          */
 191         var $mArticleBodyOnly = false;
 192
 193         var $mNewSectionLink = false;
 194         var $mHideNewSectionLink = false;
 195
 196         /**
 197          * Comes from the parser. This was probably made to load CSS/JS only
 198          * if we had "<gallery>". Used directly in CategoryPage.php
 199          * Looks like resource loader can replace this.
 200          */
 201         var $mNoGallery = false;
 202
 203         // should be private.
 204         var $mPageTitleActionText = '';
 205         var $mParseWarnings = array();
 206
 207         // Cache stuff. Looks like mEnableClientCache
 208         var $mSquidMaxage = 0;
 209
 210         // @todo document
 211         var $mPreventClickjacking = true;
 212
 213         /// should be private. To include the variable {{REVISIONID}}
 214         var $mRevisionId = null;
 215         private $mRevisionTimestamp = null;
 216
 217         var $mFileVersion = null;
 218
 219         /**
 220          * An array of stylesheet filenames (relative from skins path), with options
 221          * for CSS media, IE conditions, and RTL/LTR direction.
 222          * For internal use; add settings in the skin via $this->addStyle()
 223          *
 224          * Style again! This seems like a code duplication since we already have
 225          * mStyles. This is what makes OpenSource amazing.
 226          */
 227         var $styles = array();
 228
 229         /**
 230          * Whether jQuery is already handled.
 231          */
 232         protected $mJQueryDone = false;
 233
 234         private $mIndexPolicy = 'index';
 235         private $mFollowPolicy = 'follow';
 236         private $mVaryHeader = array(
 237                 'Accept-Encoding' => array( 'list-contains=gzip' ),
 238         );
 239
 240         /**
 241          * If the current page was reached through a redirect, $mRedirectedFrom contains the Title
 242          * of the redirect.
 243          *
 244          * @var Title
 245          */
 246         private $mRedirectedFrom = null;
 247
 248         /**
 249          * Additional key => value data
 250          */
 251         private $mProperties = array();
 252
 253         /**
 254          * @var string|null: ResourceLoader target for load.php links. If null, will be omitted
 255          */
 256         private $mTarget = null;
 257
 258         /**
 259          * @var bool: Whether output should contain table of contents
 260          */
 261         private $mEnableTOC = true;
 262
 263         /**
 264          * Constructor for OutputPage. This should not be called directly.
 265          * Instead a new RequestContext should be created and it will implicitly create
 266          * a OutputPage tied to that context.
 267          */
 268         function __construct( IContextSource $context = null ) {
 269                 if ( $context === null ) {
 270                         # Extensions should use `new RequestContext` instead of `new OutputPage` now.
 271                         wfDeprecated( __METHOD__, '1.18' );
 272                 } else {
 273                         $this->setContext( $context );
 274                 }
 275         }
 276
 277         /**
 278          * Redirect to $url rather than displaying the normal page
 279          *
 280          * @param string $url URL
 281          * @param string $responsecode HTTP status code
 282          */
 283         public function redirect( $url, $responsecode = '302' ) {
 284                 # Strip newlines as a paranoia check for header injection in PHP<5.1.2
 285                 $this->mRedirect = str_replace( "\n", '', $url );
 286                 $this->mRedirectCode = $responsecode;
 287         }
 288
 289         /**
 290          * Get the URL to redirect to, or an empty string if not redirect URL set
 291          *
 292          * @return String
 293          */
 294         public function getRedirect() {
 295                 return $this->mRedirect;
 296         }
 297
 298         /**
 299          * Set the HTTP status code to send with the output.
 300          *
 301          * @param $statusCode Integer
 302          */
 303         public function setStatusCode( $statusCode ) {
 304                 $this->mStatusCode = $statusCode;
 305         }
 306
 307         /**
 308          * Add a new "<meta>" tag
 309          * To add an http-equiv meta tag, precede the name with "http:"
 310          *
 311          * @param string $name tag name
 312          * @param string $val tag value
 313          */
 314         function addMeta( $name, $val ) {
 315                 array_push( $this->mMetatags, array( $name, $val ) );
 316         }
 317
 318         /**
 319          * Add a new \<link\> tag to the page header.
 320          *
 321          * Note: use setCanonicalUrl() for rel=canonical.
 322          *
 323          * @param array $linkarr associative array of attributes.
 324          */
 325         function addLink( $linkarr ) {
 326                 array_push( $this->mLinktags, $linkarr );
 327         }
 328
 329         /**
 330          * Add a new \<link\> with "rel" attribute set to "meta"
 331          *
 332          * @param array $linkarr associative array mapping attribute names to their
 333          *                 values, both keys and values will be escaped, and the
 334          *                 "rel" attribute will be automatically added
 335          */
 336         function addMetadataLink( $linkarr ) {
 337                 $linkarr['rel'] = $this->getMetadataAttribute();
 338                 $this->addLink( $linkarr );
 339         }
 340
 341         /**
 342          * Set the URL to be used for the <link rel=canonical>. This should be used
 343          * in preference to addLink(), to avoid duplicate link tags.
 344          */
 345         function setCanonicalUrl( $url ) {
 346                 $this->mCanonicalUrl = $url;
 347         }
 348
 349         /**
 350          * Get the value of the "rel" attribute for metadata links
 351          *
 352          * @return String
 353          */
 354         public function getMetadataAttribute() {
 355                 # note: buggy CC software only reads first "meta" link
 356                 static $haveMeta = false;
 357                 if ( $haveMeta ) {
 358                         return 'alternate meta';
 359                 } else {
 360                         $haveMeta = true;
 361                         return 'meta';
 362                 }
 363         }
 364
 365         /**
 366          * Add raw HTML to the list of scripts (including \<script\> tag, etc.)
 367          *
 368          * @param string $script raw HTML
 369          */
 370         function addScript( $script ) {
 371                 $this->mScripts .= $script . "\n";
 372         }
 373
 374         /**
 375          * Register and add a stylesheet from an extension directory.
 376          *
 377          * @param string $url path to sheet.  Provide either a full url (beginning
 378          *             with 'http', etc) or a relative path from the document root
 379          *             (beginning with '/').  Otherwise it behaves identically to
 380          *             addStyle() and draws from the /skins folder.
 381          */
 382         public function addExtensionStyle( $url ) {
 383                 array_push( $this->mExtStyles, $url );
 384         }
 385
 386         /**
 387          * Get all styles added by extensions
 388          *
 389          * @return Array
 390          */
 391         function getExtStyle() {
 392                 return $this->mExtStyles;
 393         }
 394
 395         /**
 396          * Add a JavaScript file out of skins/common, or a given relative path.
 397          *
 398          * @param string $file filename in skins/common or complete on-server path
 399          *              (/foo/bar.js)
 400          * @param string $version style version of the file. Defaults to $wgStyleVersion
 401          */
 402         public function addScriptFile( $file, $version = null ) {
 403                 global $wgStylePath, $wgStyleVersion;
 404                 // See if $file parameter is an absolute URL or begins with a slash
 405                 if ( substr( $file, 0, 1 ) == '/' || preg_match( '#^[a-z]*://#i', $file ) ) {
 406                         $path = $file;
 407                 } else {
 408                         $path = "{$wgStylePath}/common/{$file}";
 409                 }
 410                 if ( is_null( $version ) ) {
 411                         $version = $wgStyleVersion;
 412                 }
 413                 $this->addScript( Html::linkedScript( wfAppendQuery( $path, $version ) ) );
 414         }
 415
 416         /**
 417          * Add a self-contained script tag with the given contents
 418          *
 419          * @param string $script JavaScript text, no "<script>" tags
 420          */
 421         public function addInlineScript( $script ) {
 422                 $this->mScripts .= Html::inlineScript( "\n$script\n" ) . "\n";
 423         }
 424
 425         /**
 426          * Get all registered JS and CSS tags for the header.
 427          *
 428          * @return String
 429          */
 430         function getScript() {
 431                 return $this->mScripts . $this->getHeadItems();
 432         }
 433
 434         /**
 435          * Filter an array of modules to remove insufficiently trustworthy members, and modules
 436          * which are no longer registered (eg a page is cached before an extension is disabled)
 437          * @param $modules Array
 438          * @param string $position if not null, only return modules with this position
 439          * @param $type string
 440          * @return Array
 441          */
 442         protected function filterModules( $modules, $position = null, $type = ResourceLoaderModule::TYPE_COMBINED ) {
 443                 $resourceLoader = $this->getResourceLoader();
 444                 $filteredModules = array();
 445                 foreach ( $modules as $val ) {
 446                         $module = $resourceLoader->getModule( $val );
 447                         if ( $module instanceof ResourceLoaderModule
 448                                 && $module->getOrigin() <= $this->getAllowedModules( $type )
 449                                 && ( is_null( $position ) || $module->getPosition() == $position )
 450                                 && ( !$this->mTarget || in_array( $this->mTarget, $module->getTargets() ) ) )
 451                         {
 452                                 $filteredModules[] = $val;
 453                         }
 454                 }
 455                 return $filteredModules;
 456         }
 457
 458         /**
 459          * Get the list of modules to include on this page
 460          *
 461          * @param bool $filter whether to filter out insufficiently trustworthy modules
 462          * @param string $position if not null, only return modules with this position
 463          * @param $param string
 464          * @return Array of module names
 465          */
 466         public function getModules( $filter = false, $position = null, $param = 'mModules' ) {
 467                 $modules = array_values( array_unique( $this->$param ) );
 468                 return $filter
 469                         ? $this->filterModules( $modules, $position )
 470                         : $modules;
 471         }
 472
 473         /**
 474          * Add one or more modules recognized by the resource loader. Modules added
 475          * through this function will be loaded by the resource loader when the
 476          * page loads.
 477          *
 478          * @param $modules Mixed: module name (string) or array of module names
 479          */
 480         public function addModules( $modules ) {
 481                 $this->mModules = array_merge( $this->mModules, (array)$modules );
 482         }
 483
 484         /**
 485          * Get the list of module JS to include on this page
 486          *
 487          * @param $filter
 488          * @param $position
 489          *
 490          * @return array of module names
 491          */
 492         public function getModuleScripts( $filter = false, $position = null ) {
 493                 return $this->getModules( $filter, $position, 'mModuleScripts' );
 494         }
 495
 496         /**
 497          * Add only JS of one or more modules recognized by the resource loader. Module
 498          * scripts added through this function will be loaded by the resource loader when
 499          * the page loads.
 500          *
 501          * @param $modules Mixed: module name (string) or array of module names
 502          */
 503         public function addModuleScripts( $modules ) {
 504                 $this->mModuleScripts = array_merge( $this->mModuleScripts, (array)$modules );
 505         }
 506
 507         /**
 508          * Get the list of module CSS to include on this page
 509          *
 510          * @param $filter
 511          * @param $position
 512          *
 513          * @return Array of module names
 514          */
 515         public function getModuleStyles( $filter = false, $position = null ) {
 516                 return $this->getModules( $filter, $position, 'mModuleStyles' );
 517         }
 518
 519         /**
 520          * Add only CSS of one or more modules recognized by the resource loader.
 521          *
 522          * Module styles added through this function will be added using standard link CSS
 523          * tags, rather than as a combined Javascript and CSS package. Thus, they will
 524          * load when JavaScript is disabled (unless CSS also happens to be disabled).
 525          *
 526          * @param $modules Mixed: module name (string) or array of module names
 527          */
 528         public function addModuleStyles( $modules ) {
 529                 $this->mModuleStyles = array_merge( $this->mModuleStyles, (array)$modules );
 530         }
 531
 532         /**
 533          * Get the list of module messages to include on this page
 534          *
 535          * @param $filter
 536          * @param $position
 537          *
 538          * @return Array of module names
 539          */
 540         public function getModuleMessages( $filter = false, $position = null ) {
 541                 return $this->getModules( $filter, $position, 'mModuleMessages' );
 542         }
 543
 544         /**
 545          * Add only messages of one or more modules recognized by the resource loader.
 546          * Module messages added through this function will be loaded by the resource
 547          * loader when the page loads.
 548          *
 549          * @param $modules Mixed: module name (string) or array of module names
 550          */
 551         public function addModuleMessages( $modules ) {
 552                 $this->mModuleMessages = array_merge( $this->mModuleMessages, (array)$modules );
 553         }
 554
 555         /**
 556          * @return null|string: ResourceLoader target
 557          */
 558         public function getTarget() {
 559                 return $this->mTarget;
 560         }
 561
 562         /**
 563          * Sets ResourceLoader target for load.php links. If null, will be omitted
 564          *
 565          * @param $target string|null
 566          */
 567         public function setTarget( $target ) {
 568                 $this->mTarget = $target;
 569         }
 570
 571         /**
 572          * Get an array of head items
 573          *
 574          * @return Array
 575          */
 576         function getHeadItemsArray() {
 577                 return $this->mHeadItems;
 578         }
 579
 580         /**
 581          * Get all header items in a string
 582          *
 583          * @return String
 584          */
 585         function getHeadItems() {
 586                 $s = '';
 587                 foreach ( $this->mHeadItems as $item ) {
 588                         $s .= $item;
 589                 }
 590                 return $s;
 591         }
 592
 593         /**
 594          * Add or replace an header item to the output
 595          *
 596          * @param string $name item name
 597          * @param string $value raw HTML
 598          */
 599         public function addHeadItem( $name, $value ) {
 600                 $this->mHeadItems[$name] = $value;
 601         }
 602
 603         /**
 604          * Check if the header item $name is already set
 605          *
 606          * @param string $name item name
 607          * @return Boolean
 608          */
 609         public function hasHeadItem( $name ) {
 610                 return isset( $this->mHeadItems[$name] );
 611         }
 612
 613         /**
 614          * Set the value of the ETag HTTP header, only used if $wgUseETag is true
 615          *
 616          * @param string $tag value of "ETag" header
 617          */
 618         function setETag( $tag ) {
 619                 $this->mETag = $tag;
 620         }
 621
 622         /**
 623          * Set whether the output should only contain the body of the article,
 624          * without any skin, sidebar, etc.
 625          * Used e.g. when calling with "action=render".
 626          *
 627          * @param $only Boolean: whether to output only the body of the article
 628          */
 629         public function setArticleBodyOnly( $only ) {
 630                 $this->mArticleBodyOnly = $only;
 631         }
 632
 633         /**
 634          * Return whether the output will contain only the body of the article
 635          *
 636          * @return Boolean
 637          */
 638         public function getArticleBodyOnly() {
 639                 return $this->mArticleBodyOnly;
 640         }
 641
 642         /**
 643          * Set an additional output property
 644          * @since 1.21
 645          *
 646          * @param string $name
 647          * @param mixed $value
 648          */
 649         public function setProperty( $name, $value ) {
 650                 $this->mProperties[$name] = $value;
 651         }
 652
 653         /**
 654          * Get an additional output property
 655          * @since 1.21
 656          *
 657          * @param $name
 658          * @return mixed: Property value or null if not found
 659          */
 660         public function getProperty( $name ) {
 661                 if ( isset( $this->mProperties[$name] ) ) {
 662                         return $this->mProperties[$name];
 663                 } else {
 664                         return null;
 665                 }
 666         }
 667
 668         /**
 669          * checkLastModified tells the client to use the client-cached page if
 670          * possible. If successful, the OutputPage is disabled so that
 671          * any future call to OutputPage->output() have no effect.
 672          *
 673          * Side effect: sets mLastModified for Last-Modified header
 674          *
 675          * @param $timestamp string
 676          *
 677          * @return Boolean: true if cache-ok headers was sent.
 678          */
 679         public function checkLastModified( $timestamp ) {
 680                 global $wgCachePages, $wgCacheEpoch, $wgUseSquid, $wgSquidMaxage;
 681
 682                 if ( !$timestamp || $timestamp == '19700101000000' ) {
 683                         wfDebug( __METHOD__ . ": CACHE DISABLED, NO TIMESTAMP\n" );
 684                         return false;
 685                 }
 686                 if ( !$wgCachePages ) {
 687                         wfDebug( __METHOD__ . ": CACHE DISABLED\n", false );
 688                         return false;
 689                 }
 690                 if ( $this->getUser()->getOption( 'nocache' ) ) {
 691                         wfDebug( __METHOD__ . ": USER DISABLED CACHE\n", false );
 692                         return false;
 693                 }
 694
 695                 $timestamp = wfTimestamp( TS_MW, $timestamp );
 696                 $modifiedTimes = array(
 697                         'page' => $timestamp,
 698                         'user' => $this->getUser()->getTouched(),
 699                         'epoch' => $wgCacheEpoch
 700                 );
 701                 if ( $wgUseSquid ) {
 702                         // bug 44570: the core page itself may not change, but resources might
 703                         $modifiedTimes['sepoch'] = wfTimestamp( TS_MW, time() - $wgSquidMaxage );
 704                 }
 705                 wfRunHooks( 'OutputPageCheckLastModified', array( &$modifiedTimes ) );
 706
 707                 $maxModified = max( $modifiedTimes );
 708                 $this->mLastModified = wfTimestamp( TS_RFC2822, $maxModified );
 709
 710                 $clientHeader = $this->getRequest()->getHeader( 'If-Modified-Since' );
 711                 if ( $clientHeader === false ) {
 712                         wfDebug( __METHOD__ . ": client did not send If-Modified-Since header\n", false );
 713                         return false;
 714                 }
 715
 716                 # IE sends sizes after the date like this:
 717                 # Wed, 20 Aug 2003 06:51:19 GMT; length=5202
 718                 # this breaks strtotime().
 719                 $clientHeader = preg_replace( '/;.*$/', '', $clientHeader );
 720
 721                 wfSuppressWarnings(); // E_STRICT system time bitching
 722                 $clientHeaderTime = strtotime( $clientHeader );
 723                 wfRestoreWarnings();
 724                 if ( !$clientHeaderTime ) {
 725                         wfDebug( __METHOD__ . ": unable to parse the client's If-Modified-Since header: $clientHeader\n" );
 726                         return false;
 727                 }
 728                 $clientHeaderTime = wfTimestamp( TS_MW, $clientHeaderTime );
 729
 730                 # Make debug info
 731                 $info = '';
 732                 foreach ( $modifiedTimes as $name => $value ) {
 733                         if ( $info !== '' ) {
 734                                 $info .= ', ';
 735                         }
 736                         $info .= "$name=" . wfTimestamp( TS_ISO_8601, $value );
 737                 }
 738
 739                 wfDebug( __METHOD__ . ": client sent If-Modified-Since: " .
 740                         wfTimestamp( TS_ISO_8601, $clientHeaderTime ) . "\n", false );
 741                 wfDebug( __METHOD__ . ": effective Last-Modified: " .
 742                         wfTimestamp( TS_ISO_8601, $maxModified ) . "\n", false );
 743                 if ( $clientHeaderTime < $maxModified ) {
 744                         wfDebug( __METHOD__ . ": STALE, $info\n", false );
 745                         return false;
 746                 }
 747
 748                 # Not modified
 749                 # Give a 304 response code and disable body output
 750                 wfDebug( __METHOD__ . ": NOT MODIFIED, $info\n", false );
 751                 ini_set( 'zlib.output_compression', 0 );
 752                 $this->getRequest()->response()->header( "HTTP/1.1 304 Not Modified" );
 753                 $this->sendCacheControl();
 754                 $this->disable();
 755
 756                 // Don't output a compressed blob when using ob_gzhandler;
 757                 // it's technically against HTTP spec and seems to confuse
 758                 // Firefox when the response gets split over two packets.
 759                 wfClearOutputBuffers();
 760
 761                 return true;
 762         }
 763
 764         /**
 765          * Override the last modified timestamp
 766          *
 767          * @param string $timestamp new timestamp, in a format readable by
 768          *        wfTimestamp()
 769          */
 770         public function setLastModified( $timestamp ) {
 771                 $this->mLastModified = wfTimestamp( TS_RFC2822, $timestamp );
 772         }
 773
 774         /**
 775          * Set the robot policy for the page: <http://www.robotstxt.org/meta.html>
 776          *
 777          * @param string $policy the literal string to output as the contents of
 778          *   the meta tag.  Will be parsed according to the spec and output in
 779          *   standardized form.
 780          * @return null
 781          */
 782         public function setRobotPolicy( $policy ) {
 783                 $policy = Article::formatRobotPolicy( $policy );
 784
 785                 if ( isset( $policy['index'] ) ) {
 786                         $this->setIndexPolicy( $policy['index'] );
 787                 }
 788                 if ( isset( $policy['follow'] ) ) {
 789                         $this->setFollowPolicy( $policy['follow'] );
 790                 }
 791         }
 792
 793         /**
 794          * Set the index policy for the page, but leave the follow policy un-
 795          * touched.
 796          *
 797          * @param string $policy Either 'index' or 'noindex'.
 798          * @return null
 799          */
 800         public function setIndexPolicy( $policy ) {
 801                 $policy = trim( $policy );
 802                 if ( in_array( $policy, array( 'index', 'noindex' ) ) ) {
 803                         $this->mIndexPolicy = $policy;
 804                 }
 805         }
 806
 807         /**
 808          * Set the follow policy for the page, but leave the index policy un-
 809          * touched.
 810          *
 811          * @param string $policy either 'follow' or 'nofollow'.
 812          * @return null
 813          */
 814         public function setFollowPolicy( $policy ) {
 815                 $policy = trim( $policy );
 816                 if ( in_array( $policy, array( 'follow', 'nofollow' ) ) ) {
 817                         $this->mFollowPolicy = $policy;
 818                 }
 819         }
 820
 821         /**
 822          * Set the new value of the "action text", this will be added to the
 823          * "HTML title", separated from it with " - ".
 824          *
 825          * @param string $text new value of the "action text"
 826          */
 827         public function setPageTitleActionText( $text ) {
 828                 $this->mPageTitleActionText = $text;
 829         }
 830
 831         /**
 832          * Get the value of the "action text"
 833          *
 834          * @return String
 835          */
 836         public function getPageTitleActionText() {
 837                 if ( isset( $this->mPageTitleActionText ) ) {
 838                         return $this->mPageTitleActionText;
 839                 }
 840                 return '';
 841         }
 842
 843         /**
 844          * "HTML title" means the contents of "<title>".
 845          * It is stored as plain, unescaped text and will be run through htmlspecialchars in the skin file.
 846          *
 847          * @param $name string
 848          */
 849         public function setHTMLTitle( $name ) {
 850                 if ( $name instanceof Message ) {
 851                         $this->mHTMLtitle = $name->setContext( $this->getContext() )->text();
 852                 } else {
 853                         $this->mHTMLtitle = $name;
 854                 }
 855         }
 856
 857         /**
 858          * Return the "HTML title", i.e. the content of the "<title>" tag.
 859          *
 860          * @return String
 861          */
 862         public function getHTMLTitle() {
 863                 return $this->mHTMLtitle;
 864         }
 865
 866         /**
 867          * Set $mRedirectedFrom, the Title of the page which redirected us to the current page.
 868          *
 869          * @param $t Title
 870          */
 871         public function setRedirectedFrom( $t ) {
 872                 $this->mRedirectedFrom = $t;
 873         }
 874
 875         /**
 876          * "Page title" means the contents of \<h1\>. It is stored as a valid HTML fragment.
 877          * This function allows good tags like \<sup\> in the \<h1\> tag, but not bad tags like \<script\>.
 878          * This function automatically sets \<title\> to the same content as \<h1\> but with all tags removed.
 879          * Bad tags that were escaped in \<h1\> will still be escaped in \<title\>, and good tags like \<i\> will be dropped entirely.
 880          *
 881          * @param $name string|Message
 882          */
 883         public function setPageTitle( $name ) {
 884                 if ( $name instanceof Message ) {
 885                         $name = $name->setContext( $this->getContext() )->text();
 886                 }
 887
 888                 # change "<script>foo&bar</script>" to "&lt;script&gt;foo&amp;bar&lt;/script&gt;"
 889                 # but leave "<i>foobar</i>" alone
 890                 $nameWithTags = Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags( $name ) );
 891                 $this->mPagetitle = $nameWithTags;
 892
 893                 # change "<i>foo&amp;bar</i>" to "foo&bar"
 894                 $this->setHTMLTitle( $this->msg( 'pagetitle' )->rawParams( Sanitizer::stripAllTags( $nameWithTags ) ) );
 895         }
 896
 897         /**
 898          * Return the "page title", i.e. the content of the \<h1\> tag.
 899          *
 900          * @return String
 901          */
 902         public function getPageTitle() {
 903                 return $this->mPagetitle;
 904         }
 905
 906         /**
 907          * Set the Title object to use
 908          *
 909          * @param $t Title object
 910          */
 911         public function setTitle( Title $t ) {
 912                 $this->getContext()->setTitle( $t );
 913         }
 914
 915         /**
 916          * Replace the subtitle with $str
 917          *
 918          * @param string|Message $str new value of the subtitle. String should be safe HTML.
 919          */
 920         public function setSubtitle( $str ) {
 921                 $this->clearSubtitle();
 922                 $this->addSubtitle( $str );
 923         }
 924
 925         /**
 926          * Add $str to the subtitle
 927          *
 928          * @deprecated in 1.19; use addSubtitle() instead
 929          * @param string|Message $str to add to the subtitle
 930          */
 931         public function appendSubtitle( $str ) {
 932                 $this->addSubtitle( $str );
 933         }
 934
 935         /**
 936          * Add $str to the subtitle
 937          *
 938          * @param string|Message $str to add to the subtitle. String should be safe HTML.
 939          */
 940         public function addSubtitle( $str ) {
 941                 if ( $str instanceof Message ) {
 942                         $this->mSubtitle[] = $str->setContext( $this->getContext() )->parse();
 943                 } else {
 944                         $this->mSubtitle[] = $str;
 945                 }
 946         }
 947
 948         /**
 949          * Add a subtitle containing a backlink to a page
 950          *
 951          * @param $title Title to link to
 952          */
 953         public function addBacklinkSubtitle( Title $title ) {
 954                 $query = array();
 955                 if ( $title->isRedirect() ) {
 956                         $query['redirect'] = 'no';
 957                 }
 958                 $this->addSubtitle( $this->msg( 'backlinksubtitle' )->rawParams( Linker::link( $title, null, array(), $query ) ) );
 959         }
 960
 961         /**
 962          * Clear the subtitles
 963          */
 964         public function clearSubtitle() {
 965                 $this->mSubtitle = array();
 966         }
 967
 968         /**
 969          * Get the subtitle
 970          *
 971          * @return String
 972          */
 973         public function getSubtitle() {
 974                 return implode( "<br />\n\t\t\t\t", $this->mSubtitle );
 975         }
 976
 977         /**
 978          * Set the page as printable, i.e. it'll be displayed with with all
 979          * print styles included
 980          */
 981         public function setPrintable() {
 982                 $this->mPrintable = true;
 983         }
 984
 985         /**
 986          * Return whether the page is "printable"
 987          *
 988          * @return Boolean
 989          */
 990         public function isPrintable() {
 991                 return $this->mPrintable;
 992         }
 993
 994         /**
 995          * Disable output completely, i.e. calling output() will have no effect
 996          */
 997         public function disable() {
 998                 $this->mDoNothing = true;
 999         }
1000
1001         /**
1002          * Return whether the output will be completely disabled
1003          *
1004          * @return Boolean
1005          */
1006         public function isDisabled() {
1007                 return $this->mDoNothing;
1008         }
1009
1010         /**
1011          * Show an "add new section" link?
1012          *
1013          * @return Boolean
1014          */
1015         public function showNewSectionLink() {
1016                 return $this->mNewSectionLink;
1017         }
1018
1019         /**
1020          * Forcibly hide the new section link?
1021          *
1022          * @return Boolean
1023          */
1024         public function forceHideNewSectionLink() {
1025                 return $this->mHideNewSectionLink;
1026         }
1027
1028         /**
1029          * Add or remove feed links in the page header
1030          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
1031          * for the new version
1032          * @see addFeedLink()
1033          *
1034          * @param $show Boolean: true: add default feeds, false: remove all feeds
1035          */
1036         public function setSyndicated( $show = true ) {
1037                 if ( $show ) {
1038                         $this->setFeedAppendQuery( false );
1039                 } else {
1040                         $this->mFeedLinks = array();
1041                 }
1042         }
1043
1044         /**
1045          * Add default feeds to the page header
1046          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
1047          * for the new version
1048          * @see addFeedLink()
1049          *
1050          * @param string $val query to append to feed links or false to output
1051          *        default links
1052          */
1053         public function setFeedAppendQuery( $val ) {
1054                 global $wgAdvertisedFeedTypes;
1055
1056                 $this->mFeedLinks = array();
1057
1058                 foreach ( $wgAdvertisedFeedTypes as $type ) {
1059                         $query = "feed=$type";
1060                         if ( is_string( $val ) ) {
1061                                 $query .= '&' . $val;
1062                         }
1063                         $this->mFeedLinks[$type] = $this->getTitle()->getLocalURL( $query );
1064                 }
1065         }
1066
1067         /**
1068          * Add a feed link to the page header
1069          *
1070          * @param string $format feed type, should be a key of $wgFeedClasses
1071          * @param string $href URL
1072          */
1073         public function addFeedLink( $format, $href ) {
1074                 global $wgAdvertisedFeedTypes;
1075
1076                 if ( in_array( $format, $wgAdvertisedFeedTypes ) ) {
1077                         $this->mFeedLinks[$format] = $href;
1078                 }
1079         }
1080
1081         /**
1082          * Should we output feed links for this page?
1083          * @return Boolean
1084          */
1085         public function isSyndicated() {
1086                 return count( $this->mFeedLinks ) > 0;
1087         }
1088
1089         /**
1090          * Return URLs for each supported syndication format for this page.
1091          * @return array associating format keys with URLs
1092          */
1093         public function getSyndicationLinks() {
1094                 return $this->mFeedLinks;
1095         }
1096
1097         /**
1098          * Will currently always return null
1099          *
1100          * @return null
1101          */
1102         public function getFeedAppendQuery() {
1103                 return $this->mFeedLinksAppendQuery;
1104         }
1105
1106         /**
1107          * Set whether the displayed content is related to the source of the
1108          * corresponding article on the wiki
1109          * Setting true will cause the change "article related" toggle to true
1110          *
1111          * @param $v Boolean
1112          */
1113         public function setArticleFlag( $v ) {
1114                 $this->mIsarticle = $v;
1115                 if ( $v ) {
1116                         $this->mIsArticleRelated = $v;
1117                 }
1118         }
1119
1120         /**
1121          * Return whether the content displayed page is related to the source of
1122          * the corresponding article on the wiki
1123          *
1124          * @return Boolean
1125          */
1126         public function isArticle() {
1127                 return $this->mIsarticle;
1128         }
1129
1130         /**
1131          * Set whether this page is related an article on the wiki
1132          * Setting false will cause the change of "article flag" toggle to false
1133          *
1134          * @param $v Boolean
1135          */
1136         public function setArticleRelated( $v ) {
1137                 $this->mIsArticleRelated = $v;
1138                 if ( !$v ) {
1139                         $this->mIsarticle = false;
1140                 }
1141         }
1142
1143         /**
1144          * Return whether this page is related an article on the wiki
1145          *
1146          * @return Boolean
1147          */
1148         public function isArticleRelated() {
1149                 return $this->mIsArticleRelated;
1150         }
1151
1152         /**
1153          * Add new language links
1154          *
1155          * @param array $newLinkArray Associative array mapping language code to the page
1156          *                      name
1157          */
1158         public function addLanguageLinks( $newLinkArray ) {
1159                 $this->mLanguageLinks += $newLinkArray;
1160         }
1161
1162         /**
1163          * Reset the language links and add new language links
1164          *
1165          * @param array $newLinkArray Associative array mapping language code to the page
1166          *                      name
1167          */
1168         public function setLanguageLinks( $newLinkArray ) {
1169                 $this->mLanguageLinks = $newLinkArray;
1170         }
1171
1172         /**
1173          * Get the list of language links
1174          *
1175          * @return Array of Interwiki Prefixed (non DB key) Titles (e.g. 'fr:Test page')
1176          */
1177         public function getLanguageLinks() {
1178                 return $this->mLanguageLinks;
1179         }
1180
1181         /**
1182          * Add an array of categories, with names in the keys
1183          *
1184          * @param array $categories mapping category name => sort key
1185          */
1186         public function addCategoryLinks( $categories ) {
1187                 global $wgContLang;
1188
1189                 if ( !is_array( $categories ) || count( $categories ) == 0 ) {
1190                         return;
1191                 }
1192
1193                 # Add the links to a LinkBatch
1194                 $arr = array( NS_CATEGORY => $categories );
1195                 $lb = new LinkBatch;
1196                 $lb->setArray( $arr );
1197
1198                 # Fetch existence plus the hiddencat property
1199                 $dbr = wfGetDB( DB_SLAVE );
1200                 $res = $dbr->select( array( 'page', 'page_props' ),
1201                         array( 'page_id', 'page_namespace', 'page_title', 'page_len', 'page_is_redirect', 'page_latest', 'pp_value' ),
1202                         $lb->constructSet( 'page', $dbr ),
1203                         __METHOD__,
1204                         array(),
1205                         array( 'page_props' => array( 'LEFT JOIN', array( 'pp_propname' => 'hiddencat', 'pp_page = page_id' ) ) )
1206                 );
1207
1208                 # Add the results to the link cache
1209                 $lb->addResultToCache( LinkCache::singleton(), $res );
1210
1211                 # Set all the values to 'normal'. This can be done with array_fill_keys in PHP 5.2.0+
1212                 $categories = array_combine(
1213                         array_keys( $categories ),
1214                         array_fill( 0, count( $categories ), 'normal' )
1215                 );
1216
1217                 # Mark hidden categories
1218                 foreach ( $res as $row ) {
1219                         if ( isset( $row->pp_value ) ) {
1220                                 $categories[$row->page_title] = 'hidden';
1221                         }
1222                 }
1223
1224                 # Add the remaining categories to the skin
1225                 if ( wfRunHooks( 'OutputPageMakeCategoryLinks', array( &$this, $categories, &$this->mCategoryLinks ) ) ) {
1226                         foreach ( $categories as $category => $type ) {
1227                                 $origcategory = $category;
1228                                 $title = Title::makeTitleSafe( NS_CATEGORY, $category );
1229                                 $wgContLang->findVariantLink( $category, $title, true );
1230                                 if ( $category != $origcategory ) {
1231                                         if ( array_key_exists( $category, $categories ) ) {
1232                                                 continue;
1233                                         }
1234                                 }
1235                                 $text = $wgContLang->convertHtml( $title->getText() );
1236                                 $this->mCategories[] = $title->getText();
1237                                 $this->mCategoryLinks[$type][] = Linker::link( $title, $text );
1238                         }
1239                 }
1240         }
1241
1242         /**
1243          * Reset the category links (but not the category list) and add $categories
1244          *
1245          * @param array $categories mapping category name => sort key
1246          */
1247         public function setCategoryLinks( $categories ) {
1248                 $this->mCategoryLinks = array();
1249                 $this->addCategoryLinks( $categories );
1250         }
1251
1252         /**
1253          * Get the list of category links, in a 2-D array with the following format:
1254          * $arr[$type][] = $link, where $type is either "normal" or "hidden" (for
1255          * hidden categories) and $link a HTML fragment with a link to the category
1256          * page
1257          *
1258          * @return Array
1259          */
1260         public function getCategoryLinks() {
1261                 return $this->mCategoryLinks;
1262         }
1263
1264         /**
1265          * Get the list of category names this page belongs to
1266          *
1267          * @return Array of strings
1268          */
1269         public function getCategories() {
1270                 return $this->mCategories;
1271         }
1272
1273         /**
1274          * Do not allow scripts which can be modified by wiki users to load on this page;
1275          * only allow scripts bundled with, or generated by, the software.
1276          */
1277         public function disallowUserJs() {
1278                 $this->reduceAllowedModules(
1279                         ResourceLoaderModule::TYPE_SCRIPTS,
1280                         ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL
1281                 );
1282         }
1283
1284         /**
1285          * Return whether user JavaScript is allowed for this page
1286          * @deprecated since 1.18 Load modules with ResourceLoader, and origin and
1287          *     trustworthiness is identified and enforced automagically.
1288          * @return Boolean
1289          */
1290         public function isUserJsAllowed() {
1291                 wfDeprecated( __METHOD__, '1.18' );
1292                 return $this->getAllowedModules( ResourceLoaderModule::TYPE_SCRIPTS ) >= ResourceLoaderModule::ORIGIN_USER_INDIVIDUAL;
1293         }
1294
1295         /**
1296          * Show what level of JavaScript / CSS untrustworthiness is allowed on this page
1297          * @see ResourceLoaderModule::$origin
1298          * @param string $type ResourceLoaderModule TYPE_ constant
1299          * @return Int ResourceLoaderModule ORIGIN_ class constant
1300          */
1301         public function getAllowedModules( $type ) {
1302                 if ( $type == ResourceLoaderModule::TYPE_COMBINED ) {
1303                         return min( array_values( $this->mAllowedModules ) );
1304                 } else {
1305                         return isset( $this->mAllowedModules[$type] )
1306                                 ? $this->mAllowedModules[$type]
1307                                 : ResourceLoaderModule::ORIGIN_ALL;
1308                 }
1309         }
1310
1311         /**
1312          * Set the highest level of CSS/JS untrustworthiness allowed
1313          * @param  $type String ResourceLoaderModule TYPE_ constant
1314          * @param  $level Int ResourceLoaderModule class constant
1315          */
1316         public function setAllowedModules( $type, $level ) {
1317                 $this->mAllowedModules[$type] = $level;
1318         }
1319
1320         /**
1321          * As for setAllowedModules(), but don't inadvertently make the page more accessible
1322          * @param  $type String
1323          * @param  $level Int ResourceLoaderModule class constant
1324          */
1325         public function reduceAllowedModules( $type, $level ) {
1326                 $this->mAllowedModules[$type] = min( $this->getAllowedModules( $type ), $level );
1327         }
1328
1329         /**
1330          * Prepend $text to the body HTML
1331          *
1332          * @param string $text HTML
1333          */
1334         public function prependHTML( $text ) {
1335                 $this->mBodytext = $text . $this->mBodytext;
1336         }
1337
1338         /**
1339          * Append $text to the body HTML
1340          *
1341          * @param string $text HTML
1342          */
1343         public function addHTML( $text ) {
1344                 $this->mBodytext .= $text;
1345         }
1346
1347         /**
1348          * Shortcut for adding an Html::element via addHTML.
1349          *
1350          * @since 1.19
1351          *
1352          * @param $element string
1353          * @param $attribs array
1354          * @param $contents string
1355          */
1356         public function addElement( $element, $attribs = array(), $contents = '' ) {
1357                 $this->addHTML( Html::element( $element, $attribs, $contents ) );
1358         }
1359
1360         /**
1361          * Clear the body HTML
1362          */
1363         public function clearHTML() {
1364                 $this->mBodytext = '';
1365         }
1366
1367         /**
1368          * Get the body HTML
1369          *
1370          * @return String: HTML
1371          */
1372         public function getHTML() {
1373                 return $this->mBodytext;
1374         }
1375
1376         /**
1377          * Get/set the ParserOptions object to use for wikitext parsing
1378          *
1379          * @param $options ParserOptions|null either the ParserOption to use or null to only get the
1380          *                 current ParserOption object
1381          * @return ParserOptions object
1382          */
1383         public function parserOptions( $options = null ) {
1384                 if ( !$this->mParserOptions ) {
1385                         $this->mParserOptions = ParserOptions::newFromContext( $this->getContext() );
1386                         $this->mParserOptions->setEditSection( false );
1387                 }
1388                 return wfSetVar( $this->mParserOptions, $options );
1389         }
1390
1391         /**
1392          * Set the revision ID which will be seen by the wiki text parser
1393          * for things such as embedded {{REVISIONID}} variable use.
1394          *
1395          * @param $revid Mixed: an positive integer, or null
1396          * @return Mixed: previous value
1397          */
1398         public function setRevisionId( $revid ) {
1399                 $val = is_null( $revid ) ? null : intval( $revid );
1400                 return wfSetVar( $this->mRevisionId, $val );
1401         }
1402
1403         /**
1404          * Get the displayed revision ID
1405          *
1406          * @return Integer
1407          */
1408         public function getRevisionId() {
1409                 return $this->mRevisionId;
1410         }
1411
1412         /**
1413          * Set the timestamp of the revision which will be displayed. This is used
1414          * to avoid a extra DB call in Skin::lastModified().
1415          *
1416          * @param $timestamp Mixed: string, or null
1417          * @return Mixed: previous value
1418          */
1419         public function setRevisionTimestamp( $timestamp ) {
1420                 return wfSetVar( $this->mRevisionTimestamp, $timestamp );
1421         }
1422
1423         /**
1424          * Get the timestamp of displayed revision.
1425          * This will be null if not filled by setRevisionTimestamp().
1426          *
1427          * @return String or null
1428          */
1429         public function getRevisionTimestamp() {
1430                 return $this->mRevisionTimestamp;
1431         }
1432
1433         /**
1434          * Set the displayed file version
1435          *
1436          * @param $file File|bool
1437          * @return Mixed: previous value
1438          */
1439         public function setFileVersion( $file ) {
1440                 $val = null;
1441                 if ( $file instanceof File && $file->exists() ) {
1442                         $val = array( 'time' => $file->getTimestamp(), 'sha1' => $file->getSha1() );
1443                 }
1444                 return wfSetVar( $this->mFileVersion, $val, true );
1445         }
1446
1447         /**
1448          * Get the displayed file version
1449          *
1450          * @return Array|null ('time' => MW timestamp, 'sha1' => sha1)
1451          */
1452         public function getFileVersion() {
1453                 return $this->mFileVersion;
1454         }
1455
1456         /**
1457          * Get the templates used on this page
1458          *
1459          * @return Array (namespace => dbKey => revId)
1460          * @since 1.18
1461          */
1462         public function getTemplateIds() {
1463                 return $this->mTemplateIds;
1464         }
1465
1466         /**
1467          * Get the files used on this page
1468          *
1469          * @return Array (dbKey => array('time' => MW timestamp or null, 'sha1' => sha1 or ''))
1470          * @since 1.18
1471          */
1472         public function getFileSearchOptions() {
1473                 return $this->mImageTimeKeys;
1474         }
1475
1476         /**
1477          * Convert wikitext to HTML and add it to the buffer
1478          * Default assumes that the current page title will be used.
1479          *
1480          * @param $text String
1481          * @param $linestart Boolean: is this the start of a line?
1482          * @param $interface Boolean: is this text in the user interface language?
1483          */
1484         public function addWikiText( $text, $linestart = true, $interface = true ) {
1485                 $title = $this->getTitle(); // Work around E_STRICT
1486                 if ( !$title ) {
1487                         throw new MWException( 'Title is null' );
1488                 }
1489                 $this->addWikiTextTitle( $text, $title, $linestart, /*tidy*/false, $interface );
1490         }
1491
1492         /**
1493          * Add wikitext with a custom Title object
1494          *
1495          * @param string $text wikitext
1496          * @param $title Title object
1497          * @param $linestart Boolean: is this the start of a line?
1498          */
1499         public function addWikiTextWithTitle( $text, &$title, $linestart = true ) {
1500                 $this->addWikiTextTitle( $text, $title, $linestart );
1501         }
1502
1503         /**
1504          * Add wikitext with a custom Title object and tidy enabled.
1505          *
1506          * @param string $text wikitext
1507          * @param $title Title object
1508          * @param $linestart Boolean: is this the start of a line?
1509          */
1510         function addWikiTextTitleTidy( $text, &$title, $linestart = true ) {
1511                 $this->addWikiTextTitle( $text, $title, $linestart, true );
1512         }
1513
1514         /**
1515          * Add wikitext with tidy enabled
1516          *
1517          * @param string $text wikitext
1518          * @param $linestart Boolean: is this the start of a line?
1519          */
1520         public function addWikiTextTidy( $text, $linestart = true ) {
1521                 $title = $this->getTitle();
1522                 $this->addWikiTextTitleTidy( $text, $title, $linestart );
1523         }
1524
1525         /**
1526          * Add wikitext with a custom Title object
1527          *
1528          * @param string $text wikitext
1529          * @param $title Title object
1530          * @param $linestart Boolean: is this the start of a line?
1531          * @param $tidy Boolean: whether to use tidy
1532          * @param $interface Boolean: whether it is an interface message
1533          *                                                              (for example disables conversion)
1534          */
1535         public function addWikiTextTitle( $text, Title $title, $linestart, $tidy = false, $interface = false ) {
1536                 global $wgParser;
1537
1538                 wfProfileIn( __METHOD__ );
1539
1540                 $popts = $this->parserOptions();
1541                 $oldTidy = $popts->setTidy( $tidy );
1542                 $popts->setInterfaceMessage( (bool)$interface );
1543
1544                 $parserOutput = $wgParser->parse(
1545                         $text, $title, $popts,
1546                         $linestart, true, $this->mRevisionId
1547                 );
1548
1549                 $popts->setTidy( $oldTidy );
1550
1551                 $this->addParserOutput( $parserOutput );
1552
1553                 wfProfileOut( __METHOD__ );
1554         }
1555
1556         /**
1557          * Add a ParserOutput object, but without Html
1558          *
1559          * @param $parserOutput ParserOutput object
1560          */
1561         public function addParserOutputNoText( &$parserOutput ) {
1562                 $this->mLanguageLinks += $parserOutput->getLanguageLinks();
1563                 $this->addCategoryLinks( $parserOutput->getCategories() );
1564                 $this->mNewSectionLink = $parserOutput->getNewSection();
1565                 $this->mHideNewSectionLink = $parserOutput->getHideNewSection();
1566
1567                 $this->mParseWarnings = $parserOutput->getWarnings();
1568                 if ( !$parserOutput->isCacheable() ) {
1569                         $this->enableClientCache( false );
1570                 }
1571                 $this->mNoGallery = $parserOutput->getNoGallery();
1572                 $this->mHeadItems = array_merge( $this->mHeadItems, $parserOutput->getHeadItems() );
1573                 $this->addModules( $parserOutput->getModules() );
1574                 $this->addModuleScripts( $parserOutput->getModuleScripts() );
1575                 $this->addModuleStyles( $parserOutput->getModuleStyles() );
1576                 $this->addModuleMessages( $parserOutput->getModuleMessages() );
1577
1578                 // Template versioning...
1579                 foreach ( (array)$parserOutput->getTemplateIds() as $ns => $dbks ) {
1580                         if ( isset( $this->mTemplateIds[$ns] ) ) {
1581                                 $this->mTemplateIds[$ns] = $dbks + $this->mTemplateIds[$ns];
1582                         } else {
1583                                 $this->mTemplateIds[$ns] = $dbks;
1584                         }
1585                 }
1586                 // File versioning...
1587                 foreach ( (array)$parserOutput->getFileSearchOptions() as $dbk => $data ) {
1588                         $this->mImageTimeKeys[$dbk] = $data;
1589                 }
1590
1591                 // Hooks registered in the object
1592                 global $wgParserOutputHooks;
1593                 foreach ( $parserOutput->getOutputHooks() as $hookInfo ) {
1594                         list( $hookName, $data ) = $hookInfo;
1595                         if ( isset( $wgParserOutputHooks[$hookName] ) ) {
1596                                 call_user_func( $wgParserOutputHooks[$hookName], $this, $parserOutput, $data );
1597                         }
1598                 }
1599
1600                 // Link flags are ignored for now, but may in the future be
1601                 // used to mark individual language links.
1602                 $linkFlags = array();
1603                 wfRunHooks( 'LanguageLinks', array( $this->getTitle(), &$this->mLanguageLinks, &$linkFlags ) );
1604                 wfRunHooks( 'OutputPageParserOutput', array( &$this, $parserOutput ) );
1605         }
1606
1607         /**
1608          * Add a ParserOutput object
1609          *
1610          * @param $parserOutput ParserOutput
1611          */
1612         function addParserOutput( &$parserOutput ) {
1613                 $this->addParserOutputNoText( $parserOutput );
1614                 $parserOutput->setTOCEnabled( $this->mEnableTOC );
1615                 $text = $parserOutput->getText();
1616                 wfRunHooks( 'OutputPageBeforeHTML', array( &$this, &$text ) );
1617                 $this->addHTML( $text );
1618         }
1619
1620         /**
1621          * Add the output of a QuickTemplate to the output buffer
1622          *
1623          * @param $template QuickTemplate
1624          */
1625         public function addTemplate( &$template ) {
1626                 ob_start();
1627                 $template->execute();
1628                 $this->addHTML( ob_get_contents() );
1629                 ob_end_clean();
1630         }
1631
1632         /**
1633          * Parse wikitext and return the HTML.
1634          *
1635          * @param $text String
1636          * @param $linestart Boolean: is this the start of a line?
1637          * @param $interface Boolean: use interface language ($wgLang instead of
1638          *                   $wgContLang) while parsing language sensitive magic
1639          *                   words like GRAMMAR and PLURAL. This also disables
1640          *                   LanguageConverter.
1641          * @param $language  Language object: target language object, will override
1642          *                   $interface
1643          * @throws MWException
1644          * @return String: HTML
1645          */
1646         public function parse( $text, $linestart = true, $interface = false, $language = null ) {
1647                 global $wgParser;
1648
1649                 if ( is_null( $this->getTitle() ) ) {
1650                         throw new MWException( 'Empty $mTitle in ' . __METHOD__ );
1651                 }
1652
1653                 $popts = $this->parserOptions();
1654                 if ( $interface ) {
1655                         $popts->setInterfaceMessage( true );
1656                 }
1657                 if ( $language !== null ) {
1658                         $oldLang = $popts->setTargetLanguage( $language );
1659                 }
1660
1661                 $parserOutput = $wgParser->parse(
1662                         $text, $this->getTitle(), $popts,
1663                         $linestart, true, $this->mRevisionId
1664                 );
1665
1666                 if ( $interface ) {
1667                         $popts->setInterfaceMessage( false );
1668                 }
1669                 if ( $language !== null ) {
1670                         $popts->setTargetLanguage( $oldLang );
1671                 }
1672
1673                 return $parserOutput->getText();
1674         }
1675
1676         /**
1677          * Parse wikitext, strip paragraphs, and return the HTML.
1678          *
1679          * @param $text String
1680          * @param $linestart Boolean: is this the start of a line?
1681          * @param $interface Boolean: use interface language ($wgLang instead of
1682          *                   $wgContLang) while parsing language sensitive magic
1683          *                   words like GRAMMAR and PLURAL
1684          * @return String: HTML
1685          */
1686         public function parseInline( $text, $linestart = true, $interface = false ) {
1687                 $parsed = $this->parse( $text, $linestart, $interface );
1688
1689                 $m = array();
1690                 if ( preg_match( '/^<p>(.*)\n?<\/p>\n?/sU', $parsed, $m ) ) {
1691                         $parsed = $m[1];
1692                 }
1693
1694                 return $parsed;
1695         }
1696
1697         /**
1698          * Set the value of the "s-maxage" part of the "Cache-control" HTTP header
1699          *
1700          * @param $maxage Integer: maximum cache time on the Squid, in seconds.
1701          */
1702         public function setSquidMaxage( $maxage ) {
1703                 $this->mSquidMaxage = $maxage;
1704         }
1705
1706         /**
1707          * Use enableClientCache(false) to force it to send nocache headers
1708          *
1709          * @param $state bool
1710          *
1711          * @return bool
1712          */
1713         public function enableClientCache( $state ) {
1714                 return wfSetVar( $this->mEnableClientCache, $state );
1715         }
1716
1717         /**
1718          * Get the list of cookies that will influence on the cache
1719          *
1720          * @return Array
1721          */
1722         function getCacheVaryCookies() {
1723                 global $wgCookiePrefix, $wgCacheVaryCookies;
1724                 static $cookies;
1725                 if ( $cookies === null ) {
1726                         $cookies = array_merge(
1727                                 array(
1728                                         "{$wgCookiePrefix}Token",
1729                                         "{$wgCookiePrefix}LoggedOut",
1730                                         "forceHTTPS",
1731                                         session_name()
1732                                 ),
1733                                 $wgCacheVaryCookies
1734                         );
1735                         wfRunHooks( 'GetCacheVaryCookies', array( $this, &$cookies ) );
1736                 }
1737                 return $cookies;
1738         }
1739
1740         /**
1741          * Check if the request has a cache-varying cookie header
1742          * If it does, it's very important that we don't allow public caching
1743          *
1744          * @return Boolean
1745          */
1746         function haveCacheVaryCookies() {
1747                 $cookieHeader = $this->getRequest()->getHeader( 'cookie' );
1748                 if ( $cookieHeader === false ) {
1749                         return false;
1750                 }
1751                 $cvCookies = $this->getCacheVaryCookies();
1752                 foreach ( $cvCookies as $cookieName ) {
1753                         # Check for a simple string match, like the way squid does it
1754                         if ( strpos( $cookieHeader, $cookieName ) !== false ) {
1755                                 wfDebug( __METHOD__ . ": found $cookieName\n" );
1756                                 return true;
1757                         }
1758                 }
1759                 wfDebug( __METHOD__ . ": no cache-varying cookies found\n" );
1760                 return false;
1761         }
1762
1763         /**
1764          * Add an HTTP header that will influence on the cache
1765          *
1766          * @param string $header header name
1767          * @param $option Array|null
1768          * @todo FIXME: Document the $option parameter; it appears to be for
1769          *        X-Vary-Options but what format is acceptable?
1770          */
1771         public function addVaryHeader( $header, $option = null ) {
1772                 if ( !array_key_exists( $header, $this->mVaryHeader ) ) {
1773                         $this->mVaryHeader[$header] = (array)$option;
1774                 } elseif ( is_array( $option ) ) {
1775                         if ( is_array( $this->mVaryHeader[$header] ) ) {
1776                                 $this->mVaryHeader[$header] = array_merge( $this->mVaryHeader[$header], $option );
1777                         } else {
1778                                 $this->mVaryHeader[$header] = $option;
1779                         }
1780                 }
1781                 $this->mVaryHeader[$header] = array_unique( (array)$this->mVaryHeader[$header] );
1782         }
1783
1784         /**
1785          * Return a Vary: header on which to vary caches. Based on the keys of $mVaryHeader,
1786          * such as Accept-Encoding or Cookie
1787          *
1788          * @return String
1789          */
1790         public function getVaryHeader() {
1791                 return 'Vary: ' . join( ', ', array_keys( $this->mVaryHeader ) );
1792         }
1793
1794         /**
1795          * Get a complete X-Vary-Options header
1796          *
1797          * @return String
1798          */
1799         public function getXVO() {
1800                 $cvCookies = $this->getCacheVaryCookies();
1801
1802                 $cookiesOption = array();
1803                 foreach ( $cvCookies as $cookieName ) {
1804                         $cookiesOption[] = 'string-contains=' . $cookieName;
1805                 }
1806                 $this->addVaryHeader( 'Cookie', $cookiesOption );
1807
1808                 $headers = array();
1809                 foreach ( $this->mVaryHeader as $header => $option ) {
1810                         $newheader = $header;
1811                         if ( is_array( $option ) && count( $option ) > 0 ) {
1812                                 $newheader .= ';' . implode( ';', $option );
1813                         }
1814                         $headers[] = $newheader;
1815                 }
1816                 $xvo = 'X-Vary-Options: ' . implode( ',', $headers );
1817
1818                 return $xvo;
1819         }
1820
1821         /**
1822          * bug 21672: Add Accept-Language to Vary and XVO headers
1823          * if there's no 'variant' parameter existed in GET.
1824          *
1825          * For example:
1826          *   /w/index.php?title=Main_page should always be served; but
1827          *   /w/index.php?title=Main_page&variant=zh-cn should never be served.
1828          */
1829         function addAcceptLanguage() {
1830                 $lang = $this->getTitle()->getPageLanguage();
1831                 if ( !$this->getRequest()->getCheck( 'variant' ) && $lang->hasVariants() ) {
1832                         $variants = $lang->getVariants();
1833                         $aloption = array();
1834                         foreach ( $variants as $variant ) {
1835                                 if ( $variant === $lang->getCode() ) {
1836                                         continue;
1837                                 } else {
1838                                         $aloption[] = 'string-contains=' . $variant;
1839
1840                                         // IE and some other browsers use BCP 47 standards in
1841                                         // their Accept-Language header, like "zh-CN" or "zh-Hant".
1842                                         // We should handle these too.
1843                                         $variantBCP47 = wfBCP47( $variant );
1844                                         if ( $variantBCP47 !== $variant ) {
1845                                                 $aloption[] = 'string-contains=' . $variantBCP47;
1846                                         }
1847                                 }
1848                         }
1849                         $this->addVaryHeader( 'Accept-Language', $aloption );
1850                 }
1851         }
1852
1853         /**
1854          * Set a flag which will cause an X-Frame-Options header appropriate for
1855          * edit pages to be sent. The header value is controlled by
1856          * $wgEditPageFrameOptions.
1857          *
1858          * This is the default for special pages. If you display a CSRF-protected
1859          * form on an ordinary view page, then you need to call this function.
1860          *
1861          * @param $enable bool
1862          */
1863         public function preventClickjacking( $enable = true ) {
1864                 $this->mPreventClickjacking = $enable;
1865         }
1866
1867         /**
1868          * Turn off frame-breaking. Alias for $this->preventClickjacking(false).
1869          * This can be called from pages which do not contain any CSRF-protected
1870          * HTML form.
1871          */
1872         public function allowClickjacking() {
1873                 $this->mPreventClickjacking = false;
1874         }
1875
1876         /**
1877          * Get the X-Frame-Options header value (without the name part), or false
1878          * if there isn't one. This is used by Skin to determine whether to enable
1879          * JavaScript frame-breaking, for clients that don't support X-Frame-Options.
1880          *
1881          * @return string
1882          */
1883         public function getFrameOptions() {
1884                 global $wgBreakFrames, $wgEditPageFrameOptions;
1885                 if ( $wgBreakFrames ) {
1886                         return 'DENY';
1887                 } elseif ( $this->mPreventClickjacking && $wgEditPageFrameOptions ) {
1888                         return $wgEditPageFrameOptions;
1889                 }
1890                 return false;
1891         }
1892
1893         /**
1894          * Send cache control HTTP headers
1895          */
1896         public function sendCacheControl() {
1897                 global $wgUseSquid, $wgUseESI, $wgUseETag, $wgSquidMaxage, $wgUseXVO;
1898
1899                 $response = $this->getRequest()->response();
1900                 if ( $wgUseETag && $this->mETag ) {
1901                         $response->header( "ETag: $this->mETag" );
1902                 }
1903
1904                 $this->addVaryHeader( 'Cookie' );
1905                 $this->addAcceptLanguage();
1906
1907                 # don't serve compressed data to clients who can't handle it
1908                 # maintain different caches for logged-in users and non-logged in ones
1909                 $response->header( $this->getVaryHeader() );
1910
1911                 if ( $wgUseXVO ) {
1912                         # Add an X-Vary-Options header for Squid with Wikimedia patches
1913                         $response->header( $this->getXVO() );
1914                 }
1915
1916                 if ( $this->mEnableClientCache ) {
1917                         if (
1918                                 $wgUseSquid && session_id() == '' && !$this->isPrintable() &&
1919                                 $this->mSquidMaxage != 0 && !$this->haveCacheVaryCookies()
1920                         ) {
1921                                 if ( $wgUseESI ) {
1922                                         # We'll purge the proxy cache explicitly, but require end user agents
1923                                         # to revalidate against the proxy on each visit.
1924                                         # Surrogate-Control controls our Squid, Cache-Control downstream caches
1925                                         wfDebug( __METHOD__ . ": proxy caching with ESI; {$this->mLastModified} **\n", false );
1926                                         # start with a shorter timeout for initial testing
1927                                         # header( 'Surrogate-Control: max-age=2678400+2678400, content="ESI/1.0"');
1928                                         $response->header( 'Surrogate-Control: max-age=' . $wgSquidMaxage . '+' . $this->mSquidMaxage . ', content="ESI/1.0"' );
1929                                         $response->header( 'Cache-Control: s-maxage=0, must-revalidate, max-age=0' );
1930                                 } else {
1931                                         # We'll purge the proxy cache for anons explicitly, but require end user agents
1932                                         # to revalidate against the proxy on each visit.
1933                                         # IMPORTANT! The Squid needs to replace the Cache-Control header with
1934                                         # Cache-Control: s-maxage=0, must-revalidate, max-age=0
1935                                         wfDebug( __METHOD__ . ": local proxy caching; {$this->mLastModified} **\n", false );
1936                                         # start with a shorter timeout for initial testing
1937                                         # header( "Cache-Control: s-maxage=2678400, must-revalidate, max-age=0" );
1938                                         $response->header( 'Cache-Control: s-maxage=' . $this->mSquidMaxage . ', must-revalidate, max-age=0' );
1939                                 }
1940                         } else {
1941                                 # We do want clients to cache if they can, but they *must* check for updates
1942                                 # on revisiting the page.
1943                                 wfDebug( __METHOD__ . ": private caching; {$this->mLastModified} **\n", false );
1944                                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1945                                 $response->header( "Cache-Control: private, must-revalidate, max-age=0" );
1946                         }
1947                         if ( $this->mLastModified ) {
1948                                 $response->header( "Last-Modified: {$this->mLastModified}" );
1949                         }
1950                 } else {
1951                         wfDebug( __METHOD__ . ": no caching **\n", false );
1952
1953                         # In general, the absence of a last modified header should be enough to prevent
1954                         # the client from using its cache. We send a few other things just to make sure.
1955                         $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1956                         $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
1957                         $response->header( 'Pragma: no-cache' );
1958                 }
1959         }
1960
1961         /**
1962          * Get the message associated with the HTTP response code $code
1963          *
1964          * @param $code Integer: status code
1965          * @return String or null: message or null if $code is not in the list of
1966          *         messages
1967          *
1968          * @deprecated since 1.18 Use HttpStatus::getMessage() instead.
1969          */
1970         public static function getStatusMessage( $code ) {
1971                 wfDeprecated( __METHOD__, '1.18' );
1972                 return HttpStatus::getMessage( $code );
1973         }
1974
1975         /**
1976          * Finally, all the text has been munged and accumulated into
1977          * the object, let's actually output it:
1978          */
1979         public function output() {
1980                 global $wgLanguageCode, $wgDebugRedirects, $wgMimeType, $wgVaryOnXFP,
1981                         $wgUseAjax, $wgResponsiveImages;
1982
1983                 if ( $this->mDoNothing ) {
1984                         return;
1985                 }
1986
1987                 wfProfileIn( __METHOD__ );
1988
1989                 $response = $this->getRequest()->response();
1990
1991                 if ( $this->mRedirect != '' ) {
1992                         # Standards require redirect URLs to be absolute
1993                         $this->mRedirect = wfExpandUrl( $this->mRedirect, PROTO_CURRENT );
1994
1995                         $redirect = $this->mRedirect;
1996                         $code = $this->mRedirectCode;
1997
1998                         if ( wfRunHooks( "BeforePageRedirect", array( $this, &$redirect, &$code ) ) ) {
1999                                 if ( $code == '301' || $code == '303' ) {
2000                                         if ( !$wgDebugRedirects ) {
2001                                                 $message = HttpStatus::getMessage( $code );
2002                                                 $response->header( "HTTP/1.1 $code $message" );
2003                                         }
2004                                         $this->mLastModified = wfTimestamp( TS_RFC2822 );
2005                                 }
2006                                 if ( $wgVaryOnXFP ) {
2007                                         $this->addVaryHeader( 'X-Forwarded-Proto' );
2008                                 }
2009                                 $this->sendCacheControl();
2010
2011                                 $response->header( "Content-Type: text/html; charset=utf-8" );
2012                                 if ( $wgDebugRedirects ) {
2013                                         $url = htmlspecialchars( $redirect );
2014                                         print "<html>\n<head>\n<title>Redirect</title>\n</head>\n<body>\n";
2015                                         print "<p>Location: <a href=\"$url\">$url</a></p>\n";
2016                                         print "</body>\n</html>\n";
2017                                 } else {
2018                                         $response->header( 'Location: ' . $redirect );
2019                                 }
2020                         }
2021
2022                         wfProfileOut( __METHOD__ );
2023                         return;
2024                 } elseif ( $this->mStatusCode ) {
2025                         $message = HttpStatus::getMessage( $this->mStatusCode );
2026                         if ( $message ) {
2027                                 $response->header( 'HTTP/1.1 ' . $this->mStatusCode . ' ' . $message );
2028                         }
2029                 }
2030
2031                 # Buffer output; final headers may depend on later processing
2032                 ob_start();
2033
2034                 $response->header( "Content-type: $wgMimeType; charset=UTF-8" );
2035                 $response->header( 'Content-language: ' . $wgLanguageCode );
2036
2037                 // Prevent framing, if requested
2038                 $frameOptions = $this->getFrameOptions();
2039                 if ( $frameOptions ) {
2040                         $response->header( "X-Frame-Options: $frameOptions" );
2041                 }
2042
2043                 if ( $this->mArticleBodyOnly ) {
2044                         echo $this->mBodytext;
2045                 } else {
2046
2047                         $sk = $this->getSkin();
2048                         // add skin specific modules
2049                         $modules = $sk->getDefaultModules();
2050
2051                         // enforce various default modules for all skins
2052                         $coreModules = array(
2053                                 // keep this list as small as possible
2054                                 'mediawiki.page.startup',
2055                                 'mediawiki.user',
2056                         );
2057
2058                         // Support for high-density display images if enabled
2059                         if ( $wgResponsiveImages ) {
2060                                 $coreModules[] = 'mediawiki.hidpi';
2061                         }
2062
2063                         $this->addModules( $coreModules );
2064                         foreach ( $modules as $group ) {
2065                                 $this->addModules( $group );
2066                         }
2067                         MWDebug::addModules( $this );
2068                         if ( $wgUseAjax ) {
2069                                 // FIXME: deprecate? - not clear why this is useful
2070                                 wfRunHooks( 'AjaxAddScript', array( &$this ) );
2071                         }
2072
2073                         // Hook that allows last minute changes to the output page, e.g.
2074                         // adding of CSS or Javascript by extensions.
2075                         wfRunHooks( 'BeforePageDisplay', array( &$this, &$sk ) );
2076
2077                         wfProfileIn( 'Output-skin' );
2078                         $sk->outputPage();
2079                         wfProfileOut( 'Output-skin' );
2080                 }
2081
2082                 // This hook allows last minute changes to final overall output by modifying output buffer
2083                 wfRunHooks( 'AfterFinalPageOutput', array( $this ) );
2084
2085                 $this->sendCacheControl();
2086
2087                 ob_end_flush();
2088
2089                 wfProfileOut( __METHOD__ );
2090         }
2091
2092         /**
2093          * Actually output something with print.
2094          *
2095          * @param string $ins the string to output
2096          * @deprecated since 1.22 Use echo yourself.
2097          */
2098         public function out( $ins ) {
2099                 wfDeprecated( __METHOD__, '1.22' );
2100                 print $ins;
2101         }
2102
2103         /**
2104          * Produce a "user is blocked" page.
2105          * @deprecated since 1.18
2106          */
2107         function blockedPage() {
2108                 throw new UserBlockedError( $this->getUser()->mBlock );
2109         }
2110
2111         /**
2112          * Prepare this object to display an error page; disable caching and
2113          * indexing, clear the current text and redirect, set the page's title
2114          * and optionally an custom HTML title (content of the "<title>" tag).
2115          *
2116          * @param string|Message $pageTitle will be passed directly to setPageTitle()
2117          * @param string|Message $htmlTitle will be passed directly to setHTMLTitle();
2118          *                   optional, if not passed the "<title>" attribute will be
2119          *                   based on $pageTitle
2120          */
2121         public function prepareErrorPage( $pageTitle, $htmlTitle = false ) {
2122                 $this->setPageTitle( $pageTitle );
2123                 if ( $htmlTitle !== false ) {
2124                         $this->setHTMLTitle( $htmlTitle );
2125                 }
2126                 $this->setRobotPolicy( 'noindex,nofollow' );
2127                 $this->setArticleRelated( false );
2128                 $this->enableClientCache( false );
2129                 $this->mRedirect = '';
2130                 $this->clearSubtitle();
2131                 $this->clearHTML();
2132         }
2133
2134         /**
2135          * Output a standard error page
2136          *
2137          * showErrorPage( 'titlemsg', 'pagetextmsg', array( 'param1', 'param2' ) );
2138          * showErrorPage( 'titlemsg', $messageObject );
2139          * showErrorPage( $titleMessageObj, $messageObject );
2140          *
2141          * @param $title Mixed: message key (string) for page title, or a Message object
2142          * @param $msg Mixed: message key (string) for page text, or a Message object
2143          * @param array $params message parameters; ignored if $msg is a Message object
2144          */
2145         public function showErrorPage( $title, $msg, $params = array() ) {
2146                 if ( !$title instanceof Message ) {
2147                         $title = $this->msg( $title );
2148                 }
2149
2150                 $this->prepareErrorPage( $title );
2151
2152                 if ( $msg instanceof Message ) {
2153                         $this->addHTML( $msg->parseAsBlock() );
2154                 } else {
2155                         $this->addWikiMsgArray( $msg, $params );
2156                 }
2157
2158                 $this->returnToMain();
2159         }
2160
2161         /**
2162          * Output a standard permission error page
2163          *
2164          * @param array $errors error message keys
2165          * @param string $action action that was denied or null if unknown
2166          */
2167         public function showPermissionsErrorPage( $errors, $action = null ) {
2168                 // For some action (read, edit, create and upload), display a "login to do this action"
2169                 // error if all of the following conditions are met:
2170                 // 1. the user is not logged in
2171                 // 2. the only error is insufficient permissions (i.e. no block or something else)
2172                 // 3. the error can be avoided simply by logging in
2173                 if ( in_array( $action, array( 'read', 'edit', 'createpage', 'createtalk', 'upload' ) )
2174                         && $this->getUser()->isAnon() && count( $errors ) == 1 && isset( $errors[0][0] )
2175                         && ( $errors[0][0] == 'badaccess-groups' || $errors[0][0] == 'badaccess-group0' )
2176                         && ( User::groupHasPermission( 'user', $action )
2177                         || User::groupHasPermission( 'autoconfirmed', $action ) )
2178                 ) {
2179                         $displayReturnto = null;
2180
2181                         # Due to bug 32276, if a user does not have read permissions,
2182                         # $this->getTitle() will just give Special:Badtitle, which is
2183                         # not especially useful as a returnto parameter. Use the title
2184                         # from the request instead, if there was one.
2185                         $request = $this->getRequest();
2186                         $returnto = Title::newFromURL( $request->getVal( 'title', '' ) );
2187                         if ( $action == 'edit' ) {
2188                                 $msg = 'whitelistedittext';
2189                                 $displayReturnto = $returnto;
2190                         } elseif ( $action == 'createpage' || $action == 'createtalk' ) {
2191                                 $msg = 'nocreatetext';
2192                         } elseif ( $action == 'upload' ) {
2193                                 $msg = 'uploadnologintext';
2194                         } else { # Read
2195                                 $msg = 'loginreqpagetext';
2196                                 $displayReturnto = Title::newMainPage();
2197                         }
2198
2199                         $query = array();
2200
2201                         if ( $returnto ) {
2202                                 $query['returnto'] = $returnto->getPrefixedText();
2203
2204                                 if ( !$request->wasPosted() ) {
2205                                         $returntoquery = $request->getValues();
2206                                         unset( $returntoquery['title'] );
2207                                         unset( $returntoquery['returnto'] );
2208                                         unset( $returntoquery['returntoquery'] );
2209                                         $query['returntoquery'] = wfArrayToCgi( $returntoquery );
2210                                 }
2211                         }
2212                         $loginLink = Linker::linkKnown(
2213                                 SpecialPage::getTitleFor( 'Userlogin' ),
2214                                 $this->msg( 'loginreqlink' )->escaped(),
2215                                 array(),
2216                                 $query
2217                         );
2218
2219                         $this->prepareErrorPage( $this->msg( 'loginreqtitle' ) );
2220                         $this->addHTML( $this->msg( $msg )->rawParams( $loginLink )->parse() );
2221
2222                         # Don't return to a page the user can't read otherwise
2223                         # we'll end up in a pointless loop
2224                         if ( $displayReturnto && $displayReturnto->userCan( 'read', $this->getUser() ) ) {
2225                                 $this->returnToMain( null, $displayReturnto );
2226                         }
2227                 } else {
2228                         $this->prepareErrorPage( $this->msg( 'permissionserrors' ) );
2229                         $this->addWikiText( $this->formatPermissionsErrorMessage( $errors, $action ) );
2230                 }
2231         }
2232
2233         /**
2234          * Display an error page indicating that a given version of MediaWiki is
2235          * required to use it
2236          *
2237          * @param $version Mixed: the version of MediaWiki needed to use the page
2238          */
2239         public function versionRequired( $version ) {
2240                 $this->prepareErrorPage( $this->msg( 'versionrequired', $version ) );
2241
2242                 $this->addWikiMsg( 'versionrequiredtext', $version );
2243                 $this->returnToMain();
2244         }
2245
2246         /**
2247          * Display an error page noting that a given permission bit is required.
2248          * @deprecated since 1.18, just throw the exception directly
2249          * @param string $permission key required
2250          * @throws PermissionsError
2251          */
2252         public function permissionRequired( $permission ) {
2253                 throw new PermissionsError( $permission );
2254         }
2255
2256         /**
2257          * Produce the stock "please login to use the wiki" page
2258          *
2259          * @deprecated in 1.19; throw the exception directly
2260          */
2261         public function loginToUse() {
2262                 throw new PermissionsError( 'read' );
2263         }
2264
2265         /**
2266          * Format a list of error messages
2267          *
2268          * @param array $errors of arrays returned by Title::getUserPermissionsErrors
2269          * @param string $action action that was denied or null if unknown
2270          * @return String: the wikitext error-messages, formatted into a list.
2271          */
2272         public function formatPermissionsErrorMessage( $errors, $action = null ) {
2273                 if ( $action == null ) {
2274                         $text = $this->msg( 'permissionserrorstext', count( $errors ) )->plain() . "\n\n";
2275                 } else {
2276                         $action_desc = $this->msg( "action-$action" )->plain();
2277                         $text = $this->msg(
2278                                 'permissionserrorstext-withaction',
2279                                 count( $errors ),
2280                                 $action_desc
2281                         )->plain() . "\n\n";
2282                 }
2283
2284                 if ( count( $errors ) > 1 ) {
2285                         $text .= '<ul class="permissions-errors">' . "\n";
2286
2287                         foreach ( $errors as $error ) {
2288                                 $text .= '<li>';
2289                                 $text .= call_user_func_array( array( $this, 'msg' ), $error )->plain();
2290                                 $text .= "</li>\n";
2291                         }
2292                         $text .= '</ul>';
2293                 } else {
2294                         $text .= "<div class=\"permissions-errors\">\n" .
2295                                         call_user_func_array( array( $this, 'msg' ), reset( $errors ) )->plain() .
2296                                         "\n</div>";
2297                 }
2298
2299                 return $text;
2300         }
2301
2302         /**
2303          * Display a page stating that the Wiki is in read-only mode,
2304          * and optionally show the source of the page that the user
2305          * was trying to edit.  Should only be called (for this
2306          * purpose) after wfReadOnly() has returned true.
2307          *
2308          * For historical reasons, this function is _also_ used to
2309          * show the error message when a user tries to edit a page
2310          * they are not allowed to edit.  (Unless it's because they're
2311          * blocked, then we show blockedPage() instead.)  In this
2312          * case, the second parameter should be set to true and a list
2313          * of reasons supplied as the third parameter.
2314          *
2315          * @todo Needs to be split into multiple functions.
2316          *
2317          * @param $source    String: source code to show (or null).
2318          * @param $protected Boolean: is this a permissions error?
2319          * @param $reasons   Array: list of reasons for this error, as returned by Title::getUserPermissionsErrors().
2320          * @param $action    String: action that was denied or null if unknown
2321          * @throws ReadOnlyError
2322          */
2323         public function readOnlyPage( $source = null, $protected = false, $reasons = array(), $action = null ) {
2324                 $this->setRobotPolicy( 'noindex,nofollow' );
2325                 $this->setArticleRelated( false );
2326
2327                 // If no reason is given, just supply a default "I can't let you do
2328                 // that, Dave" message.  Should only occur if called by legacy code.
2329                 if ( $protected && empty( $reasons ) ) {
2330                         $reasons[] = array( 'badaccess-group0' );
2331                 }
2332
2333                 if ( !empty( $reasons ) ) {
2334                         // Permissions error
2335                         if ( $source ) {
2336                                 $this->setPageTitle( $this->msg( 'viewsource-title', $this->getTitle()->getPrefixedText() ) );
2337                                 $this->addBacklinkSubtitle( $this->getTitle() );
2338                         } else {
2339                                 $this->setPageTitle( $this->msg( 'badaccess' ) );
2340                         }
2341                         $this->addWikiText( $this->formatPermissionsErrorMessage( $reasons, $action ) );
2342                 } else {
2343                         // Wiki is read only
2344                         throw new ReadOnlyError;
2345                 }
2346
2347                 // Show source, if supplied
2348                 if ( is_string( $source ) ) {
2349                         $this->addWikiMsg( 'viewsourcetext' );
2350
2351                         $pageLang = $this->getTitle()->getPageLanguage();
2352                         $params = array(
2353                                 'id' => 'wpTextbox1',
2354                                 'name' => 'wpTextbox1',
2355                                 'cols' => $this->getUser()->getOption( 'cols' ),
2356                                 'rows' => $this->getUser()->getOption( 'rows' ),
2357                                 'readonly' => 'readonly',
2358                                 'lang' => $pageLang->getHtmlCode(),
2359                                 'dir' => $pageLang->getDir(),
2360                         );
2361                         $this->addHTML( Html::element( 'textarea', $params, $source ) );
2362
2363                         // Show templates used by this article
2364                         $templates = Linker::formatTemplates( $this->getTitle()->getTemplateLinksFrom() );
2365                         $this->addHTML( "<div class='templatesUsed'>
2366 $templates
2367 </div>
2368 " );
2369                 }
2370
2371                 # If the title doesn't exist, it's fairly pointless to print a return
2372                 # link to it.  After all, you just tried editing it and couldn't, so
2373                 # what's there to do there?
2374                 if ( $this->getTitle()->exists() ) {
2375                         $this->returnToMain( null, $this->getTitle() );
2376                 }
2377         }
2378
2379         /**
2380          * Turn off regular page output and return an error response
2381          * for when rate limiting has triggered.
2382          */
2383         public function rateLimited() {
2384                 throw new ThrottledError;
2385         }
2386
2387         /**
2388          * Show a warning about slave lag
2389          *
2390          * If the lag is higher than $wgSlaveLagCritical seconds,
2391          * then the warning is a bit more obvious. If the lag is
2392          * lower than $wgSlaveLagWarning, then no warning is shown.
2393          *
2394          * @param $lag Integer: slave lag
2395          */
2396         public function showLagWarning( $lag ) {
2397                 global $wgSlaveLagWarning, $wgSlaveLagCritical;
2398                 if ( $lag >= $wgSlaveLagWarning ) {
2399                         $message = $lag < $wgSlaveLagCritical
2400                                 ? 'lag-warn-normal'
2401                                 : 'lag-warn-high';
2402                         $wrap = Html::rawElement( 'div', array( 'class' => "mw-{$message}" ), "\n$1\n" );
2403                         $this->wrapWikiMsg( "$wrap\n", array( $message, $this->getLanguage()->formatNum( $lag ) ) );
2404                 }
2405         }
2406
2407         public function showFatalError( $message ) {
2408                 $this->prepareErrorPage( $this->msg( 'internalerror' ) );
2409
2410                 $this->addHTML( $message );
2411         }
2412
2413         public function showUnexpectedValueError( $name, $val ) {
2414                 $this->showFatalError( $this->msg( 'unexpected', $name, $val )->text() );
2415         }
2416
2417         public function showFileCopyError( $old, $new ) {
2418                 $this->showFatalError( $this->msg( 'filecopyerror', $old, $new )->text() );
2419         }
2420
2421         public function showFileRenameError( $old, $new ) {
2422                 $this->showFatalError( $this->msg( 'filerenameerror', $old, $new )->text() );
2423         }
2424
2425         public function showFileDeleteError( $name ) {
2426                 $this->showFatalError( $this->msg( 'filedeleteerror', $name )->text() );
2427         }
2428
2429         public function showFileNotFoundError( $name ) {
2430                 $this->showFatalError( $this->msg( 'filenotfound', $name )->text() );
2431         }
2432
2433         /**
2434          * Add a "return to" link pointing to a specified title
2435          *
2436          * @param $title Title to link
2437          * @param array $query query string parameters
2438          * @param string $text text of the link (input is not escaped)
2439          * @param $options Options array to pass to Linker
2440          */
2441         public function addReturnTo( $title, $query = array(), $text = null, $options = array() ) {
2442                 $link = $this->msg( 'returnto' )->rawParams(
2443                         Linker::link( $title, $text, array(), $query, $options ) )->escaped();
2444                 $this->addHTML( "<p id=\"mw-returnto\">{$link}</p>\n" );
2445         }
2446
2447         /**
2448          * Add a "return to" link pointing to a specified title,
2449          * or the title indicated in the request, or else the main page
2450          *
2451          * @param $unused
2452          * @param $returnto Title or String to return to
2453          * @param string $returntoquery query string for the return to link
2454          */
2455         public function returnToMain( $unused = null, $returnto = null, $returntoquery = null ) {
2456                 if ( $returnto == null ) {
2457                         $returnto = $this->getRequest()->getText( 'returnto' );
2458                 }
2459
2460                 if ( $returntoquery == null ) {
2461                         $returntoquery = $this->getRequest()->getText( 'returntoquery' );
2462                 }
2463
2464                 if ( $returnto === '' ) {
2465                         $returnto = Title::newMainPage();
2466                 }
2467
2468                 if ( is_object( $returnto ) ) {
2469                         $titleObj = $returnto;
2470                 } else {
2471                         $titleObj = Title::newFromText( $returnto );
2472                 }
2473                 if ( !is_object( $titleObj ) ) {
2474                         $titleObj = Title::newMainPage();
2475                 }
2476
2477                 $this->addReturnTo( $titleObj, wfCgiToArray( $returntoquery ) );
2478         }
2479
2480         /**
2481          * @param $sk Skin The given Skin
2482          * @param $includeStyle Boolean: unused
2483          * @return String: The doctype, opening "<html>", and head element.
2484          */
2485         public function headElement( Skin $sk, $includeStyle = true ) {
2486                 global $wgContLang, $wgMimeType;
2487
2488                 $userdir = $this->getLanguage()->getDir();
2489                 $sitedir = $wgContLang->getDir();
2490
2491                 $ret = Html::htmlHeader( array( 'lang' => $this->getLanguage()->getHtmlCode(), 'dir' => $userdir, 'class' => 'client-nojs' ) );
2492
2493                 if ( $this->getHTMLTitle() == '' ) {
2494                         $this->setHTMLTitle( $this->msg( 'pagetitle', $this->getPageTitle() ) );
2495                 }
2496
2497                 $openHead = Html::openElement( 'head' );
2498                 if ( $openHead ) {
2499                         # Don't bother with the newline if $head == ''
2500                         $ret .= "$openHead\n";
2501                 }
2502
2503                 if ( !Html::isXmlMimeType( $wgMimeType ) ) {
2504                         // Add <meta charset="UTF-8">
2505                         // This should be before <title> since it defines the charset used by
2506                         // text including the text inside <title>.
2507                         // The spec recommends defining XHTML5's charset using the XML declaration
2508                         // instead of meta.
2509                         // Our XML declaration is output by Html::htmlHeader.
2510                         // http://www.whatwg.org/html/semantics.html#attr-meta-http-equiv-content-type
2511                         // http://www.whatwg.org/html/semantics.html#charset
2512                         $ret .= Html::element( 'meta', array( 'charset' => 'UTF-8' ) );
2513                 }
2514
2515                 $ret .= Html::element( 'title', null, $this->getHTMLTitle() ) . "\n";
2516
2517                 $ret .= implode( "\n", array(
2518                         $this->getHeadLinks(),
2519                         $this->buildCssLinks(),
2520                         $this->getHeadScripts(),
2521                         $this->getHeadItems()
2522                 ) );
2523
2524                 $closeHead = Html::closeElement( 'head' );
2525                 if ( $closeHead ) {
2526                         $ret .= "$closeHead\n";
2527                 }
2528
2529                 $bodyClasses = array();
2530                 $bodyClasses[] = 'mediawiki';
2531
2532                 # Classes for LTR/RTL directionality support
2533                 $bodyClasses[] = $userdir;
2534                 $bodyClasses[] = "sitedir-$sitedir";
2535
2536                 if ( $this->getLanguage()->capitalizeAllNouns() ) {
2537                         # A <body> class is probably not the best way to do this . . .
2538                         $bodyClasses[] = 'capitalize-all-nouns';
2539                 }
2540
2541                 $bodyClasses[] = $sk->getPageClasses( $this->getTitle() );
2542                 $bodyClasses[] = 'skin-' . Sanitizer::escapeClass( $sk->getSkinName() );
2543                 $bodyClasses[] = 'action-' . Sanitizer::escapeClass( Action::getActionName( $this->getContext() ) );
2544
2545                 $bodyAttrs = array();
2546                 // While the implode() is not strictly needed, it's used for backwards compatibility
2547                 // (this used to be built as a string and hooks likely still expect that).
2548                 $bodyAttrs['class'] = implode( ' ', $bodyClasses );
2549
2550                 // Allow skins and extensions to add body attributes they need
2551                 $sk->addToBodyAttributes( $this, $bodyAttrs );
2552                 wfRunHooks( 'OutputPageBodyAttributes', array( $this, $sk, &$bodyAttrs ) );
2553
2554                 $ret .= Html::openElement( 'body', $bodyAttrs ) . "\n";
2555
2556                 return $ret;
2557         }
2558
2559         /**
2560          * Get a ResourceLoader object associated with this OutputPage
2561          *
2562          * @return ResourceLoader
2563          */
2564         public function getResourceLoader() {
2565                 if ( is_null( $this->mResourceLoader ) ) {
2566                         $this->mResourceLoader = new ResourceLoader();
2567                 }
2568                 return $this->mResourceLoader;
2569         }
2570
2571         /**
2572          * TODO: Document
2573          * @param $modules Array/string with the module name(s)
2574          * @param string $only ResourceLoaderModule TYPE_ class constant
2575          * @param $useESI boolean
2576          * @param array $extraQuery with extra query parameters to add to each request. array( param => value )
2577          * @param $loadCall boolean If true, output an (asynchronous) mw.loader.load() call rather than a "<script src='...'>" tag
2578          * @return string html "<script>" and "<style>" tags
2579          */
2580         protected function makeResourceLoaderLink( $modules, $only, $useESI = false, array $extraQuery = array(), $loadCall = false ) {
2581                 global $wgResourceLoaderUseESI;
2582
2583                 $modules = (array)$modules;
2584
2585                 if ( !count( $modules ) ) {
2586                         return '';
2587                 }
2588
2589                 if ( count( $modules ) > 1 ) {
2590                         // Remove duplicate module requests
2591                         $modules = array_unique( $modules );
2592                         // Sort module names so requests are more uniform
2593                         sort( $modules );
2594
2595                         if ( ResourceLoader::inDebugMode() ) {
2596                                 // Recursively call us for every item
2597                                 $links = '';
2598                                 foreach ( $modules as $name ) {
2599                                         $links .= $this->makeResourceLoaderLink( $name, $only, $useESI );
2600                                 }
2601                                 return $links;
2602                         }
2603                 }
2604                 if ( !is_null( $this->mTarget ) ) {
2605                         $extraQuery['target'] = $this->mTarget;
2606                 }
2607
2608                 // Create keyed-by-group list of module objects from modules list
2609                 $groups = array();
2610                 $resourceLoader = $this->getResourceLoader();
2611                 foreach ( $modules as $name ) {
2612                         $module = $resourceLoader->getModule( $name );
2613                         # Check that we're allowed to include this module on this page
2614                         if ( !$module
2615                                 || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_SCRIPTS )
2616                                         && $only == ResourceLoaderModule::TYPE_SCRIPTS )
2617                                 || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_STYLES )
2618                                         && $only == ResourceLoaderModule::TYPE_STYLES )
2619                                 || ( $this->mTarget && !in_array( $this->mTarget, $module->getTargets() ) )
2620                         ) {
2621                                 continue;
2622                         }
2623
2624                         $group = $module->getGroup();
2625                         if ( !isset( $groups[$group] ) ) {
2626                                 $groups[$group] = array();
2627                         }
2628                         $groups[$group][$name] = $module;
2629                 }
2630
2631                 $links = '';
2632                 foreach ( $groups as $group => $grpModules ) {
2633                         // Special handling for user-specific groups
2634                         $user = null;
2635                         if ( ( $group === 'user' || $group === 'private' ) && $this->getUser()->isLoggedIn() ) {
2636                                 $user = $this->getUser()->getName();
2637                         }
2638
2639                         // Create a fake request based on the one we are about to make so modules return
2640                         // correct timestamp and emptiness data
2641                         $query = ResourceLoader::makeLoaderQuery(
2642                                 array(), // modules; not determined yet
2643                                 $this->getLanguage()->getCode(),
2644                                 $this->getSkin()->getSkinName(),
2645                                 $user,
2646                                 null, // version; not determined yet
2647                                 ResourceLoader::inDebugMode(),
2648                                 $only === ResourceLoaderModule::TYPE_COMBINED ? null : $only,
2649                                 $this->isPrintable(),
2650                                 $this->getRequest()->getBool( 'handheld' ),
2651                                 $extraQuery
2652                         );
2653                         $context = new ResourceLoaderContext( $resourceLoader, new FauxRequest( $query ) );
2654                         // Extract modules that know they're empty
2655                         $emptyModules = array();
2656                         foreach ( $grpModules as $key => $module ) {
2657                                 if ( $module->isKnownEmpty( $context ) ) {
2658                                         $emptyModules[$key] = 'ready';
2659                                         unset( $grpModules[$key] );
2660                                 }
2661                         }
2662                         // Inline empty modules: since they're empty, just mark them as 'ready'
2663                         if ( count( $emptyModules ) > 0 && $only !== ResourceLoaderModule::TYPE_STYLES ) {
2664                                 // If we're only getting the styles, we don't need to do anything for empty modules.
2665                                 $links .= Html::inlineScript(
2666                                                 ResourceLoader::makeLoaderConditionalScript(
2667                                                                 ResourceLoader::makeLoaderStateScript( $emptyModules )
2668                                                 )
2669                                 ) . "\n";
2670                         }
2671
2672                         // If there are no modules left, skip this group
2673                         if ( count( $grpModules ) === 0 ) {
2674                                 continue;
2675                         }
2676
2677                         // Inline private modules. These can't be loaded through load.php for security
2678                         // reasons, see bug 34907. Note that these modules should be loaded from
2679                         // getHeadScripts() before the first loader call. Otherwise other modules can't
2680                         // properly use them as dependencies (bug 30914)
2681                         if ( $group === 'private' ) {
2682                                 if ( $only == ResourceLoaderModule::TYPE_STYLES ) {
2683                                         $links .= Html::inlineStyle(
2684                                                 $resourceLoader->makeModuleResponse( $context, $grpModules )
2685                                         );
2686                                 } else {
2687                                         $links .= Html::inlineScript(
2688                                                 ResourceLoader::makeLoaderConditionalScript(
2689                                                         $resourceLoader->makeModuleResponse( $context, $grpModules )
2690                                                 )
2691                                         );
2692                                 }
2693                                 $links .= "\n";
2694                                 continue;
2695                         }
2696                         // Special handling for the user group; because users might change their stuff
2697                         // on-wiki like user pages, or user preferences; we need to find the highest
2698                         // timestamp of these user-changeable modules so we can ensure cache misses on change
2699                         // This should NOT be done for the site group (bug 27564) because anons get that too
2700                         // and we shouldn't be putting timestamps in Squid-cached HTML
2701                         $version = null;
2702                         if ( $group === 'user' ) {
2703                                 // Get the maximum timestamp
2704                                 $timestamp = 1;
2705                                 foreach ( $grpModules as $module ) {
2706                                         $timestamp = max( $timestamp, $module->getModifiedTime( $context ) );
2707                                 }
2708                                 // Add a version parameter so cache will break when things change
2709                                 $version = wfTimestamp( TS_ISO_8601_BASIC, $timestamp );
2710                         }
2711
2712                         $url = ResourceLoader::makeLoaderURL(
2713                                 array_keys( $grpModules ),
2714                                 $this->getLanguage()->getCode(),
2715                                 $this->getSkin()->getSkinName(),
2716                                 $user,
2717                                 $version,
2718                                 ResourceLoader::inDebugMode(),
2719                                 $only === ResourceLoaderModule::TYPE_COMBINED ? null : $only,
2720                                 $this->isPrintable(),
2721                                 $this->getRequest()->getBool( 'handheld' ),
2722                                 $extraQuery
2723                         );
2724                         if ( $useESI && $wgResourceLoaderUseESI ) {
2725                                 $esi = Xml::element( 'esi:include', array( 'src' => $url ) );
2726                                 if ( $only == ResourceLoaderModule::TYPE_STYLES ) {
2727                                         $link = Html::inlineStyle( $esi );
2728                                 } else {
2729                                         $link = Html::inlineScript( $esi );
2730                                 }
2731                         } else {
2732                                 // Automatically select style/script elements
2733                                 if ( $only === ResourceLoaderModule::TYPE_STYLES ) {
2734                                         $link = Html::linkedStyle( $url );
2735                                 } elseif ( $loadCall ) {
2736                                         $link = Html::inlineScript(
2737                                                 ResourceLoader::makeLoaderConditionalScript(
2738                                                         Xml::encodeJsCall( 'mw.loader.load', array( $url, 'text/javascript', true ) )
2739                                                 )
2740                                         );
2741                                 } else {
2742                                         $link = Html::linkedScript( $url );
2743                                 }
2744                         }
2745
2746                         if ( $group == 'noscript' ) {
2747                                 $links .= Html::rawElement( 'noscript', array(), $link ) . "\n";
2748                         } else {
2749                                 $links .= $link . "\n";
2750                         }
2751                 }
2752                 return $links;
2753         }
2754
2755         /**
2756          * JS stuff to put in the "<head>". This is the startup module, config
2757          * vars and modules marked with position 'top'
2758          *
2759          * @return String: HTML fragment
2760          */
2761         function getHeadScripts() {
2762                 global $wgResourceLoaderExperimentalAsyncLoading;
2763
2764                 // Startup - this will immediately load jquery and mediawiki modules
2765                 $scripts = $this->makeResourceLoaderLink( 'startup', ResourceLoaderModule::TYPE_SCRIPTS, true );
2766
2767                 // Load config before anything else
2768                 $scripts .= Html::inlineScript(
2769                         ResourceLoader::makeLoaderConditionalScript(
2770                                 ResourceLoader::makeConfigSetScript( $this->getJSVars() )
2771                         )
2772                 );
2773
2774                 // Load embeddable private modules before any loader links
2775                 // This needs to be TYPE_COMBINED so these modules are properly wrapped
2776                 // in mw.loader.implement() calls and deferred until mw.user is available
2777                 $embedScripts = array( 'user.options', 'user.tokens' );
2778                 $scripts .= $this->makeResourceLoaderLink( $embedScripts, ResourceLoaderModule::TYPE_COMBINED );
2779
2780                 // Script and Messages "only" requests marked for top inclusion
2781                 // Messages should go first
2782                 $scripts .= $this->makeResourceLoaderLink( $this->getModuleMessages( true, 'top' ), ResourceLoaderModule::TYPE_MESSAGES );
2783                 $scripts .= $this->makeResourceLoaderLink( $this->getModuleScripts( true, 'top' ), ResourceLoaderModule::TYPE_SCRIPTS );
2784
2785                 // Modules requests - let the client calculate dependencies and batch requests as it likes
2786                 // Only load modules that have marked themselves for loading at the top
2787                 $modules = $this->getModules( true, 'top' );
2788                 if ( $modules ) {
2789                         $scripts .= Html::inlineScript(
2790                                 ResourceLoader::makeLoaderConditionalScript(
2791                                         Xml::encodeJsCall( 'mw.loader.load', array( $modules ) )
2792                                 )
2793                         );
2794                 }
2795
2796                 if ( $wgResourceLoaderExperimentalAsyncLoading ) {
2797                         $scripts .= $this->getScriptsForBottomQueue( true );
2798                 }
2799
2800                 return $scripts;
2801         }
2802
2803         /**
2804          * JS stuff to put at the 'bottom', which can either be the bottom of the "<body>"
2805          * or the bottom of the "<head>" depending on $wgResourceLoaderExperimentalAsyncLoading:
2806          * modules marked with position 'bottom', legacy scripts ($this->mScripts),
2807          * user preferences, site JS and user JS
2808          *
2809          * @param $inHead boolean If true, this HTML goes into the "<head>", if false it goes into the "<body>"
2810          * @return string
2811          */
2812         function getScriptsForBottomQueue( $inHead ) {
2813                 global $wgUseSiteJs, $wgAllowUserJs;
2814
2815                 // Script and Messages "only" requests marked for bottom inclusion
2816                 // If we're in the <head>, use load() calls rather than <script src="..."> tags
2817                 // Messages should go first
2818                 $scripts = $this->makeResourceLoaderLink( $this->getModuleMessages( true, 'bottom' ),
2819                         ResourceLoaderModule::TYPE_MESSAGES, /* $useESI = */ false, /* $extraQuery = */ array(),
2820                         /* $loadCall = */ $inHead
2821                 );
2822                 $scripts .= $this->makeResourceLoaderLink( $this->getModuleScripts( true, 'bottom' ),
2823                         ResourceLoaderModule::TYPE_SCRIPTS, /* $useESI = */ false, /* $extraQuery = */ array(),
2824                         /* $loadCall = */ $inHead
2825                 );
2826
2827                 // Modules requests - let the client calculate dependencies and batch requests as it likes
2828                 // Only load modules that have marked themselves for loading at the bottom
2829                 $modules = $this->getModules( true, 'bottom' );
2830                 if ( $modules ) {
2831                         $scripts .= Html::inlineScript(
2832                                 ResourceLoader::makeLoaderConditionalScript(
2833                                         Xml::encodeJsCall( 'mw.loader.load', array( $modules, null, true ) )
2834                                 )
2835                         );
2836                 }
2837
2838                 // Legacy Scripts
2839                 $scripts .= "\n" . $this->mScripts;
2840
2841                 $defaultModules = array();
2842
2843                 // Add site JS if enabled
2844                 if ( $wgUseSiteJs ) {
2845                         $scripts .= $this->makeResourceLoaderLink( 'site', ResourceLoaderModule::TYPE_SCRIPTS,
2846                                 /* $useESI = */ false, /* $extraQuery = */ array(), /* $loadCall = */ $inHead
2847                         );
2848                         $defaultModules['site'] = 'loading';
2849                 } else {
2850                         // Site module is empty, save request by marking ready in advance (bug 46857)
2851                         $defaultModules['site'] = 'ready';
2852                 }
2853
2854                 // Add user JS if enabled
2855                 if ( $wgAllowUserJs ) {
2856                         if ( $this->getUser()->isLoggedIn() ) {
2857                                 if ( $this->getTitle() && $this->getTitle()->isJsSubpage() && $this->userCanPreview() ) {
2858                                         # XXX: additional security check/prompt?
2859                                         // We're on a preview of a JS subpage
2860                                         // Exclude this page from the user module in case it's in there (bug 26283)
2861                                         $scripts .= $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_SCRIPTS, false,
2862                                                 array( 'excludepage' => $this->getTitle()->getPrefixedDBkey() ), $inHead
2863                                         );
2864                                         // Load the previewed JS
2865                                         $scripts .= Html::inlineScript( "\n" . $this->getRequest()->getText( 'wpTextbox1' ) . "\n" ) . "\n";
2866                                         // FIXME: If the user is previewing, say, ./vector.js, his ./common.js will be loaded
2867                                         // asynchronously and may arrive *after* the inline script here. So the previewed code
2868                                         // may execute before ./common.js runs. Normally, ./common.js runs before ./vector.js...
2869                                 } else {
2870                                         // Include the user module normally, i.e., raw to avoid it being wrapped in a closure.
2871                                         $scripts .= $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_SCRIPTS,
2872                                                 /* $useESI = */ false, /* $extraQuery = */ array(), /* $loadCall = */ $inHead
2873                                         );
2874                                 }
2875                                 $defaultModules['user'] = 'loading';
2876                         } else {
2877                                 // Non-logged-in users have an empty user module.
2878                                 // Save request by marking ready in advance (bug 46857)
2879                                 $defaultModules['user'] = 'ready';
2880                         }
2881                 } else {
2882                         // User modules are disabled on this wiki.
2883                         // Save request by marking ready in advance (bug 46857)
2884                         $defaultModules['user'] = 'ready';
2885                 }
2886
2887                 // Group JS is only enabled if site JS is enabled.
2888                 if ( $wgUseSiteJs ) {
2889                         if ( $this->getUser()->isLoggedIn() ) {
2890                                 $scripts .= $this->makeResourceLoaderLink( 'user.groups', ResourceLoaderModule::TYPE_COMBINED,
2891                                         /* $useESI = */ false, /* $extraQuery = */ array(), /* $loadCall = */ $inHead
2892                                 );
2893                                 $defaultModules['user.groups'] = 'loading';
2894                         } else {
2895                                 // Non-logged-in users have no user.groups module.
2896                                 // Save request by marking ready in advance (bug 46857)
2897                                 $defaultModules['user.groups'] = 'ready';
2898                         }
2899                 } else {
2900                         // Site (and group JS) disabled
2901                         $defaultModules['user.groups'] = 'ready';
2902                 }
2903
2904                 $loaderInit = '';
2905                 if ( $inHead ) {
2906                         // We generate loader calls anyway, so no need to fix the client-side loader's state to 'loading'.
2907                         foreach ( $defaultModules as $m => $state ) {
2908                                 if ( $state == 'loading' ) {
2909                                         unset( $defaultModules[$m] );
2910                                 }
2911                         }
2912                 }
2913                 if ( count( $defaultModules ) > 0 ) {
2914                         $loaderInit = Html::inlineScript(
2915                                 ResourceLoader::makeLoaderConditionalScript(
2916                                         ResourceLoader::makeLoaderStateScript( $defaultModules )
2917                                 )
2918                         ) . "\n";
2919                 }
2920                 return $loaderInit . $scripts;
2921         }
2922
2923         /**
2924          * JS stuff to put at the bottom of the "<body>"
2925          * @return string
2926          */
2927         function getBottomScripts() {
2928                 global $wgResourceLoaderExperimentalAsyncLoading;
2929
2930                 // Optimise jQuery ready event cross-browser.
2931                 // This also enforces $.isReady to be true at </body> which fixes the
2932                 // mw.loader bug in Firefox with using document.write between </body>
2933                 // and the DOMContentReady event (bug 47457).
2934                 $html = Html::inlineScript( 'window.jQuery && jQuery.ready();' );
2935
2936                 if ( !$wgResourceLoaderExperimentalAsyncLoading ) {
2937                         $html .= $this->getScriptsForBottomQueue( false );
2938                 }
2939
2940                 return $html;
2941         }
2942
2943         /**
2944          * Add one or more variables to be set in mw.config in JavaScript.
2945          *
2946          * @param $keys {String|Array} Key or array of key/value pairs.
2947          * @param $value {Mixed} [optional] Value of the configuration variable.
2948          */
2949         public function addJsConfigVars( $keys, $value = null ) {
2950                 if ( is_array( $keys ) ) {
2951                         foreach ( $keys as $key => $value ) {
2952                                 $this->mJsConfigVars[$key] = $value;
2953                         }
2954                         return;
2955                 }
2956
2957                 $this->mJsConfigVars[$keys] = $value;
2958         }
2959
2960         /**
2961          * Get an array containing the variables to be set in mw.config in JavaScript.
2962          *
2963          * DO NOT CALL THIS FROM OUTSIDE OF THIS CLASS OR Skin::makeGlobalVariablesScript().
2964          * This is only public until that function is removed. You have been warned.
2965          *
2966          * Do not add things here which can be evaluated in ResourceLoaderStartUpModule
2967          * - in other words, page-independent/site-wide variables (without state).
2968          * You will only be adding bloat to the html page and causing page caches to
2969          * have to be purged on configuration changes.
2970          * @return array
2971          */
2972         public function getJSVars() {
2973                 global $wgContLang;
2974
2975                 $curRevisionId = 0;
2976                 $articleId = 0;
2977                 $canonicalSpecialPageName = false; # bug 21115
2978
2979                 $title = $this->getTitle();
2980                 $ns = $title->getNamespace();
2981                 $canonicalNamespace = MWNamespace::exists( $ns ) ? MWNamespace::getCanonicalName( $ns ) : $title->getNsText();
2982
2983                 // Get the relevant title so that AJAX features can use the correct page name
2984                 // when making API requests from certain special pages (bug 34972).
2985                 $relevantTitle = $this->getSkin()->getRelevantTitle();
2986
2987                 if ( $ns == NS_SPECIAL ) {
2988                         list( $canonicalSpecialPageName, /*...*/ ) = SpecialPageFactory::resolveAlias( $title->getDBkey() );
2989                 } elseif ( $this->canUseWikiPage() ) {
2990                         $wikiPage = $this->getWikiPage();
2991                         $curRevisionId = $wikiPage->getLatest();
2992                         $articleId = $wikiPage->getId();
2993                 }
2994
2995                 $lang = $title->getPageLanguage();
2996
2997                 // Pre-process information
2998                 $separatorTransTable = $lang->separatorTransformTable();
2999                 $separatorTransTable = $separatorTransTable ? $separatorTransTable : array();
3000                 $compactSeparatorTransTable = array(
3001                         implode( "\t", array_keys( $separatorTransTable ) ),
3002                         implode( "\t", $separatorTransTable ),
3003                 );
3004                 $digitTransTable = $lang->digitTransformTable();
3005                 $digitTransTable = $digitTransTable ? $digitTransTable : array();
3006                 $compactDigitTransTable = array(
3007                         implode( "\t", array_keys( $digitTransTable ) ),
3008                         implode( "\t", $digitTransTable ),
3009                 );
3010
3011                 $user = $this->getUser();
3012
3013                 $vars = array(
3014                         'wgCanonicalNamespace' => $canonicalNamespace,
3015                         'wgCanonicalSpecialPageName' => $canonicalSpecialPageName,
3016                         'wgNamespaceNumber' => $title->getNamespace(),
3017                         'wgPageName' => $title->getPrefixedDBkey(),
3018                         'wgTitle' => $title->getText(),
3019                         'wgCurRevisionId' => $curRevisionId,
3020                         'wgRevisionId' => (int)$this->getRevisionId(),
3021                         'wgArticleId' => $articleId,
3022                         'wgIsArticle' => $this->isArticle(),
3023                         'wgIsRedirect' => $title->isRedirect(),
3024                         'wgAction' => Action::getActionName( $this->getContext() ),
3025                         'wgUserName' => $user->isAnon() ? null : $user->getName(),
3026                         'wgUserGroups' => $user->getEffectiveGroups(),
3027                         'wgCategories' => $this->getCategories(),
3028                         'wgBreakFrames' => $this->getFrameOptions() == 'DENY',
3029                         'wgPageContentLanguage' => $lang->getCode(),
3030                         'wgPageContentModel' => $title->getContentModel(),
3031                         'wgSeparatorTransformTable' => $compactSeparatorTransTable,
3032                         'wgDigitTransformTable' => $compactDigitTransTable,
3033                         'wgDefaultDateFormat' => $lang->getDefaultDateFormat(),
3034                         'wgMonthNames' => $lang->getMonthNamesArray(),
3035                         'wgMonthNamesShort' => $lang->getMonthAbbreviationsArray(),
3036                         'wgRelevantPageName' => $relevantTitle->getPrefixedDBkey(),
3037                 );
3038                 if ( $user->isLoggedIn() ) {
3039                         $vars['wgUserId'] = $user->getId();
3040                         $vars['wgUserEditCount'] = $user->getEditCount();
3041                         $userReg = wfTimestampOrNull( TS_UNIX, $user->getRegistration() );
3042                         $vars['wgUserRegistration'] = $userReg !== null ? ( $userReg * 1000 ) : null;
3043                         // Get the revision ID of the oldest new message on the user's talk
3044                         // page. This can be used for constructing new message alerts on
3045                         // the client side.
3046                         $vars['wgUserNewMsgRevisionId'] = $user->getNewMessageRevisionId();
3047                 }
3048                 if ( $wgContLang->hasVariants() ) {
3049                         $vars['wgUserVariant'] = $wgContLang->getPreferredVariant();
3050                 }
3051                 // Same test as SkinTemplate
3052                 $vars['wgIsProbablyEditable'] = $title->quickUserCan( 'edit', $user ) && ( $title->exists() || $title->quickUserCan( 'create', $user ) );
3053                 foreach ( $title->getRestrictionTypes() as $type ) {
3054                         $vars['wgRestriction' . ucfirst( $type )] = $title->getRestrictions( $type );
3055                 }
3056                 if ( $title->isMainPage() ) {
3057                         $vars['wgIsMainPage'] = true;
3058                 }
3059                 if ( $this->mRedirectedFrom ) {
3060                         $vars['wgRedirectedFrom'] = $this->mRedirectedFrom->getPrefixedDBkey();
3061                 }
3062
3063                 // Allow extensions to add their custom variables to the mw.config map.
3064                 // Use the 'ResourceLoaderGetConfigVars' hook if the variable is not
3065                 // page-dependant but site-wide (without state).
3066                 // Alternatively, you may want to use OutputPage->addJsConfigVars() instead.
3067                 wfRunHooks( 'MakeGlobalVariablesScript', array( &$vars, $this ) );
3068
3069                 // Merge in variables from addJsConfigVars last
3070                 return array_merge( $vars, $this->mJsConfigVars );
3071         }
3072
3073         /**
3074          * To make it harder for someone to slip a user a fake
3075          * user-JavaScript or user-CSS preview, a random token
3076          * is associated with the login session. If it's not
3077          * passed back with the preview request, we won't render
3078          * the code.
3079          *
3080          * @return bool
3081          */
3082         public function userCanPreview() {
3083                 if ( $this->getRequest()->getVal( 'action' ) != 'submit'
3084                         || !$this->getRequest()->wasPosted()
3085                         || !$this->getUser()->matchEditToken(
3086                                 $this->getRequest()->getVal( 'wpEditToken' ) )
3087                 ) {
3088                         return false;
3089                 }
3090                 if ( !$this->getTitle()->isJsSubpage() && !$this->getTitle()->isCssSubpage() ) {
3091                         return false;
3092                 }
3093
3094                 return !count( $this->getTitle()->getUserPermissionsErrors( 'edit', $this->getUser() ) );
3095         }
3096
3097         /**
3098          * @return array in format "link name or number => 'link html'".
3099          */
3100         public function getHeadLinksArray() {
3101                 global $wgUniversalEditButton, $wgFavicon, $wgAppleTouchIcon, $wgEnableAPI,
3102                         $wgSitename, $wgVersion,
3103                         $wgFeed, $wgOverrideSiteFeed, $wgAdvertisedFeedTypes,
3104                         $wgDisableLangConversion, $wgCanonicalLanguageLinks,
3105                         $wgRightsPage, $wgRightsUrl;
3106
3107                 $tags = array();
3108
3109                 $canonicalUrl = $this->mCanonicalUrl;
3110
3111                 $tags['meta-generator'] = Html::element( 'meta', array(
3112                         'name' => 'generator',
3113                         'content' => "MediaWiki $wgVersion",
3114                 ) );
3115
3116                 $p = "{$this->mIndexPolicy},{$this->mFollowPolicy}";
3117                 if ( $p !== 'index,follow' ) {
3118                         // http://www.robotstxt.org/wc/meta-user.html
3119                         // Only show if it's different from the default robots policy
3120                         $tags['meta-robots'] = Html::element( 'meta', array(
3121                                 'name' => 'robots',
3122                                 'content' => $p,
3123                         ) );
3124                 }
3125
3126                 foreach ( $this->mMetatags as $tag ) {
3127                         if ( 0 == strcasecmp( 'http:', substr( $tag[0], 0, 5 ) ) ) {
3128                                 $a = 'http-equiv';
3129                                 $tag[0] = substr( $tag[0], 5 );
3130                         } else {
3131                                 $a = 'name';
3132                         }
3133                         $tagName = "meta-{$tag[0]}";
3134                         if ( isset( $tags[$tagName] ) ) {
3135                                 $tagName .= $tag[1];
3136                         }
3137                         $tags[$tagName] = Html::element( 'meta',
3138                                 array(
3139                                         $a => $tag[0],
3140                                         'content' => $tag[1]
3141                                 )
3142                         );
3143                 }
3144
3145                 foreach ( $this->mLinktags as $tag ) {
3146                         $tags[] = Html::element( 'link', $tag );
3147                 }
3148
3149                 # Universal edit button
3150                 if ( $wgUniversalEditButton && $this->isArticleRelated() ) {
3151                         $user = $this->getUser();
3152                         if ( $this->getTitle()->quickUserCan( 'edit', $user )
3153                                 && ( $this->getTitle()->exists() || $this->getTitle()->quickUserCan( 'create', $user ) ) ) {
3154                                 // Original UniversalEditButton
3155                                 $msg = $this->msg( 'edit' )->text();
3156                                 $tags['universal-edit-button'] = Html::element( 'link', array(
3157                                         'rel' => 'alternate',
3158                                         'type' => 'application/x-wiki',
3159                                         'title' => $msg,
3160                                         'href' => $this->getTitle()->getLocalURL( 'action=edit' )
3161                                 ) );
3162                                 // Alternate edit link
3163                                 $tags['alternative-edit'] = Html::element( 'link', array(
3164                                         'rel' => 'edit',
3165                                         'title' => $msg,
3166                                         'href' => $this->getTitle()->getLocalURL( 'action=edit' )
3167                                 ) );
3168                         }
3169                 }
3170
3171                 # Generally the order of the favicon and apple-touch-icon links
3172                 # should not matter, but Konqueror (3.5.9 at least) incorrectly
3173                 # uses whichever one appears later in the HTML source. Make sure
3174                 # apple-touch-icon is specified first to avoid this.
3175                 if ( $wgAppleTouchIcon !== false ) {
3176                         $tags['apple-touch-icon'] = Html::element( 'link', array( 'rel' => 'apple-touch-icon', 'href' => $wgAppleTouchIcon ) );
3177                 }
3178
3179                 if ( $wgFavicon !== false ) {
3180                         $tags['favicon'] = Html::element( 'link', array( 'rel' => 'shortcut icon', 'href' => $wgFavicon ) );
3181                 }
3182
3183                 # OpenSearch description link
3184                 $tags['opensearch'] = Html::element( 'link', array(
3185                         'rel' => 'search',
3186                         'type' => 'application/opensearchdescription+xml',
3187                         'href' => wfScript( 'opensearch_desc' ),
3188                         'title' => $this->msg( 'opensearch-desc' )->inContentLanguage()->text(),
3189                 ) );
3190
3191                 if ( $wgEnableAPI ) {
3192                         # Real Simple Discovery link, provides auto-discovery information
3193                         # for the MediaWiki API (and potentially additional custom API
3194                         # support such as WordPress or Twitter-compatible APIs for a
3195                         # blogging extension, etc)
3196                         $tags['rsd'] = Html::element( 'link', array(
3197                                 'rel' => 'EditURI',
3198                                 'type' => 'application/rsd+xml',
3199                                 // Output a protocol-relative URL here if $wgServer is protocol-relative
3200                                 // Whether RSD accepts relative or protocol-relative URLs is completely undocumented, though
3201                                 'href' => wfExpandUrl( wfAppendQuery( wfScript( 'api' ), array( 'action' => 'rsd' ) ), PROTO_RELATIVE ),
3202                         ) );
3203                 }
3204
3205                 # Language variants
3206                 if ( !$wgDisableLangConversion && $wgCanonicalLanguageLinks ) {
3207                         $lang = $this->getTitle()->getPageLanguage();
3208                         if ( $lang->hasVariants() ) {
3209
3210                                 $urlvar = $lang->getURLVariant();
3211
3212                                 if ( !$urlvar ) {
3213                                         $variants = $lang->getVariants();
3214                                         foreach ( $variants as $_v ) {
3215                                                 $tags["variant-$_v"] = Html::element( 'link', array(
3216                                                         'rel' => 'alternate',
3217                                                         'hreflang' => wfBCP47( $_v ),
3218                                                         'href' => $this->getTitle()->getLocalURL( array( 'variant' => $_v ) ) )
3219                                                 );
3220                                         }
3221                                 } else {
3222                                         $canonicalUrl = $this->getTitle()->getLocalURL();
3223                                 }
3224                         }
3225                 }
3226
3227                 # Copyright
3228                 $copyright = '';
3229                 if ( $wgRightsPage ) {
3230                         $copy = Title::newFromText( $wgRightsPage );
3231
3232                         if ( $copy ) {
3233                                 $copyright = $copy->getLocalURL();
3234                         }
3235                 }
3236
3237                 if ( !$copyright && $wgRightsUrl ) {
3238                         $copyright = $wgRightsUrl;
3239                 }
3240
3241                 if ( $copyright ) {
3242                         $tags['copyright'] = Html::element( 'link', array(
3243                                 'rel' => 'copyright',
3244                                 'href' => $copyright )
3245                         );
3246                 }
3247
3248                 # Feeds
3249                 if ( $wgFeed ) {
3250                         foreach ( $this->getSyndicationLinks() as $format => $link ) {
3251                                 # Use the page name for the title.  In principle, this could
3252                                 # lead to issues with having the same name for different feeds
3253                                 # corresponding to the same page, but we can't avoid that at
3254                                 # this low a level.
3255
3256                                 $tags[] = $this->feedLink(
3257                                         $format,
3258                                         $link,
3259                                         # Used messages: 'page-rss-feed' and 'page-atom-feed' (for an easier grep)
3260                                         $this->msg( "page-{$format}-feed", $this->getTitle()->getPrefixedText() )->text()
3261                                 );
3262                         }
3263
3264                         # Recent changes feed should appear on every page (except recentchanges,
3265                         # that would be redundant). Put it after the per-page feed to avoid
3266                         # changing existing behavior. It's still available, probably via a
3267                         # menu in your browser. Some sites might have a different feed they'd
3268                         # like to promote instead of the RC feed (maybe like a "Recent New Articles"
3269                         # or "Breaking news" one). For this, we see if $wgOverrideSiteFeed is defined.
3270                         # If so, use it instead.
3271                         if ( $wgOverrideSiteFeed ) {
3272                                 foreach ( $wgOverrideSiteFeed as $type => $feedUrl ) {
3273                                         // Note, this->feedLink escapes the url.
3274                                         $tags[] = $this->feedLink(
3275                                                 $type,
3276                                                 $feedUrl,
3277                                                 $this->msg( "site-{$type}-feed", $wgSitename )->text()
3278                                         );
3279                                 }
3280                         } elseif ( !$this->getTitle()->isSpecial( 'Recentchanges' ) ) {
3281                                 $rctitle = SpecialPage::getTitleFor( 'Recentchanges' );
3282                                 foreach ( $wgAdvertisedFeedTypes as $format ) {
3283                                         $tags[] = $this->feedLink(
3284                                                 $format,
3285                                                 $rctitle->getLocalURL( array( 'feed' => $format ) ),
3286                                                 $this->msg( "site-{$format}-feed", $wgSitename )->text() # For grep: 'site-rss-feed', 'site-atom-feed'.
3287                                         );
3288                                 }
3289                         }
3290                 }
3291
3292                 # Canonical URL
3293                 global $wgEnableCanonicalServerLink;
3294                 if ( $wgEnableCanonicalServerLink ) {
3295                         if ( $canonicalUrl !== false ) {
3296                                 $canonicalUrl = wfExpandUrl( $canonicalUrl, PROTO_CANONICAL );
3297                         } else {
3298                                 $reqUrl = $this->getRequest()->getRequestURL();
3299                                 $canonicalUrl = wfExpandUrl( $reqUrl, PROTO_CANONICAL );
3300                         }
3301                 }
3302                 if ( $canonicalUrl !== false ) {
3303                         $tags[] = Html::element( 'link', array(
3304                                 'rel' => 'canonical',
3305                                 'href' => $canonicalUrl
3306                         ) );
3307                 }
3308
3309                 return $tags;
3310         }
3311
3312         /**
3313          * @return string HTML tag links to be put in the header.
3314          */
3315         public function getHeadLinks() {
3316                 return implode( "\n", $this->getHeadLinksArray() );
3317         }
3318
3319         /**
3320          * Generate a "<link rel/>" for a feed.
3321          *
3322          * @param string $type feed type
3323          * @param string $url URL to the feed
3324          * @param string $text value of the "title" attribute
3325          * @return String: HTML fragment
3326          */
3327         private function feedLink( $type, $url, $text ) {
3328                 return Html::element( 'link', array(
3329                         'rel' => 'alternate',
3330                         'type' => "application/$type+xml",
3331                         'title' => $text,
3332                         'href' => $url )
3333                 );
3334         }
3335
3336         /**
3337          * Add a local or specified stylesheet, with the given media options.
3338          * Meant primarily for internal use...
3339          *
3340          * @param string $style URL to the file
3341          * @param string $media to specify a media type, 'screen', 'printable', 'handheld' or any.
3342          * @param string $condition for IE conditional comments, specifying an IE version
3343          * @param string $dir set to 'rtl' or 'ltr' for direction-specific sheets
3344          */
3345         public function addStyle( $style, $media = '', $condition = '', $dir = '' ) {
3346                 $options = array();
3347                 // Even though we expect the media type to be lowercase, but here we
3348                 // force it to lowercase to be safe.
3349                 if ( $media ) {
3350                         $options['media'] = $media;
3351                 }
3352                 if ( $condition ) {
3353                         $options['condition'] = $condition;
3354                 }
3355                 if ( $dir ) {
3356                         $options['dir'] = $dir;
3357                 }
3358                 $this->styles[$style] = $options;
3359         }
3360
3361         /**
3362          * Adds inline CSS styles
3363          * @param $style_css Mixed: inline CSS
3364          * @param string $flip Set to 'flip' to flip the CSS if needed
3365          */
3366         public function addInlineStyle( $style_css, $flip = 'noflip' ) {
3367                 if ( $flip === 'flip' && $this->getLanguage()->isRTL() ) {
3368                         # If wanted, and the interface is right-to-left, flip the CSS
3369                         $style_css = CSSJanus::transform( $style_css, true, false );
3370                 }
3371                 $this->mInlineStyles .= Html::inlineStyle( $style_css );
3372         }
3373
3374         /**
3375          * Build a set of "<link>" elements for the stylesheets specified in the $this->styles array.
3376          * These will be applied to various media & IE conditionals.
3377          *
3378          * @return string
3379          */
3380         public function buildCssLinks() {
3381                 global $wgUseSiteCss, $wgAllowUserCss, $wgAllowUserCssPrefs, $wgContLang;
3382
3383                 $this->getSkin()->setupSkinUserCss( $this );
3384
3385                 // Add ResourceLoader styles
3386                 // Split the styles into four groups
3387                 $styles = array( 'other' => array(), 'user' => array(), 'site' => array(), 'private' => array(), 'noscript' => array() );
3388                 $otherTags = ''; // Tags to append after the normal <link> tags
3389                 $resourceLoader = $this->getResourceLoader();
3390
3391                 $moduleStyles = $this->getModuleStyles();
3392
3393                 // Per-site custom styles
3394                 if ( $wgUseSiteCss ) {
3395                         $moduleStyles[] = 'site';
3396                         $moduleStyles[] = 'noscript';
3397                         if ( $this->getUser()->isLoggedIn() ) {
3398                                 $moduleStyles[] = 'user.groups';
3399                         }
3400                 }
3401
3402                 // Per-user custom styles
3403                 if ( $wgAllowUserCss ) {
3404                         if ( $this->getTitle()->isCssSubpage() && $this->userCanPreview() ) {
3405                                 // We're on a preview of a CSS subpage
3406                                 // Exclude this page from the user module in case it's in there (bug 26283)
3407                                 $otherTags .= $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_STYLES, false,
3408                                         array( 'excludepage' => $this->getTitle()->getPrefixedDBkey() )
3409                                 );
3410
3411                                 // Load the previewed CSS
3412                                 // If needed, Janus it first. This is user-supplied CSS, so it's
3413                                 // assumed to be right for the content language directionality.
3414                                 $previewedCSS = $this->getRequest()->getText( 'wpTextbox1' );
3415                                 if ( $this->getLanguage()->getDir() !== $wgContLang->getDir() ) {
3416                                         $previewedCSS = CSSJanus::transform( $previewedCSS, true, false );
3417                                 }
3418                                 $otherTags .= Html::inlineStyle( $previewedCSS );
3419                         } else {
3420                                 // Load the user styles normally
3421                                 $moduleStyles[] = 'user';
3422                         }
3423                 }
3424
3425                 // Per-user preference styles
3426                 if ( $wgAllowUserCssPrefs ) {
3427                         $moduleStyles[] = 'user.cssprefs';
3428                 }
3429
3430                 foreach ( $moduleStyles as $name ) {
3431                         $module = $resourceLoader->getModule( $name );
3432                         if ( !$module ) {
3433                                 continue;
3434                         }
3435                         $group = $module->getGroup();
3436                         // Modules in groups named "other" or anything different than "user", "site" or "private"
3437                         // will be placed in the "other" group
3438                         $styles[isset( $styles[$group] ) ? $group : 'other'][] = $name;
3439                 }
3440
3441                 // We want site, private and user styles to override dynamically added styles from modules, but we want
3442                 // dynamically added styles to override statically added styles from other modules. So the order
3443                 // has to be other, dynamic, site, private, user
3444                 // Add statically added styles for other modules
3445                 $ret = $this->makeResourceLoaderLink( $styles['other'], ResourceLoaderModule::TYPE_STYLES );
3446                 // Add normal styles added through addStyle()/addInlineStyle() here
3447                 $ret .= implode( "\n", $this->buildCssLinksArray() ) . $this->mInlineStyles;
3448                 // Add marker tag to mark the place where the client-side loader should inject dynamic styles
3449                 // We use a <meta> tag with a made-up name for this because that's valid HTML
3450                 $ret .= Html::element( 'meta', array( 'name' => 'ResourceLoaderDynamicStyles', 'content' => '' ) ) . "\n";
3451
3452                 // Add site, private and user styles
3453                 // 'private' at present only contains user.options, so put that before 'user'
3454                 // Any future private modules will likely have a similar user-specific character
3455                 foreach ( array( 'site', 'noscript', 'private', 'user' ) as $group ) {
3456                         $ret .= $this->makeResourceLoaderLink( $styles[$group],
3457                                         ResourceLoaderModule::TYPE_STYLES
3458                         );
3459                 }
3460
3461                 // Add stuff in $otherTags (previewed user CSS if applicable)
3462                 $ret .= $otherTags;
3463                 return $ret;
3464         }
3465
3466         /**
3467          * @return Array
3468          */
3469         public function buildCssLinksArray() {
3470                 $links = array();
3471
3472                 // Add any extension CSS
3473                 foreach ( $this->mExtStyles as $url ) {
3474                         $this->addStyle( $url );
3475                 }
3476                 $this->mExtStyles = array();
3477
3478                 foreach ( $this->styles as $file => $options ) {
3479                         $link = $this->styleLink( $file, $options );
3480                         if ( $link ) {
3481                                 $links[$file] = $link;
3482                         }
3483                 }
3484                 return $links;
3485         }
3486
3487         /**
3488          * Generate \<link\> tags for stylesheets
3489          *
3490          * @param string $style URL to the file
3491          * @param array $options option, can contain 'condition', 'dir', 'media'
3492          *                 keys
3493          * @return String: HTML fragment
3494          */
3495         protected function styleLink( $style, $options ) {
3496                 if ( isset( $options['dir'] ) ) {
3497                         if ( $this->getLanguage()->getDir() != $options['dir'] ) {
3498                                 return '';
3499                         }
3500                 }
3501
3502                 if ( isset( $options['media'] ) ) {
3503                         $media = self::transformCssMedia( $options['media'] );
3504                         if ( is_null( $media ) ) {
3505                                 return '';
3506                         }
3507                 } else {
3508                         $media = 'all';
3509                 }
3510
3511                 if ( substr( $style, 0, 1 ) == '/' ||
3512                         substr( $style, 0, 5 ) == 'http:' ||
3513                         substr( $style, 0, 6 ) == 'https:' ) {
3514                         $url = $style;
3515                 } else {
3516                         global $wgStylePath, $wgStyleVersion;
3517                         $url = $wgStylePath . '/' . $style . '?' . $wgStyleVersion;
3518                 }
3519
3520                 $link = Html::linkedStyle( $url, $media );
3521
3522                 if ( isset( $options['condition'] ) ) {
3523                         $condition = htmlspecialchars( $options['condition'] );
3524                         $link = "<!--[if $condition]>$link<![endif]-->";
3525                 }
3526                 return $link;
3527         }
3528
3529         /**
3530          * Transform "media" attribute based on request parameters
3531          *
3532          * @param string $media current value of the "media" attribute
3533          * @return String: modified value of the "media" attribute, or null to skip
3534          * this stylesheet
3535          */
3536         public static function transformCssMedia( $media ) {
3537                 global $wgRequest;
3538
3539                 // http://www.w3.org/TR/css3-mediaqueries/#syntax
3540                 $screenMediaQueryRegex = '/^(?:only\s+)?screen\b/i';
3541
3542                 // Switch in on-screen display for media testing
3543                 $switches = array(
3544                         'printable' => 'print',
3545                         'handheld' => 'handheld',
3546                 );
3547                 foreach ( $switches as $switch => $targetMedia ) {
3548                         if ( $wgRequest->getBool( $switch ) ) {
3549                                 if ( $media == $targetMedia ) {
3550                                         $media = '';
3551                                 } elseif ( preg_match( $screenMediaQueryRegex, $media ) === 1 ) {
3552                                         // This regex will not attempt to understand a comma-separated media_query_list
3553                                         //
3554                                         // Example supported values for $media: 'screen', 'only screen', 'screen and (min-width: 982px)' ),
3555                                         // Example NOT supported value for $media: '3d-glasses, screen, print and resolution > 90dpi'
3556                                         //
3557                                         // If it's a print request, we never want any kind of screen stylesheets
3558                                         // If it's a handheld request (currently the only other choice with a switch),
3559                                         // we don't want simple 'screen' but we might want screen queries that
3560                                         // have a max-width or something, so we'll pass all others on and let the
3561                                         // client do the query.
3562                                         if ( $targetMedia == 'print' || $media == 'screen' ) {
3563                                                 return null;
3564                                         }
3565                                 }
3566                         }
3567                 }
3568
3569                 return $media;
3570         }
3571
3572         /**
3573          * Add a wikitext-formatted message to the output.
3574          * This is equivalent to:
3575          *
3576          *    $wgOut->addWikiText( wfMessage( ... )->plain() )
3577          */
3578         public function addWikiMsg( /*...*/ ) {
3579                 $args = func_get_args();
3580                 $name = array_shift( $args );
3581                 $this->addWikiMsgArray( $name, $args );
3582         }
3583
3584         /**
3585          * Add a wikitext-formatted message to the output.
3586          * Like addWikiMsg() except the parameters are taken as an array
3587          * instead of a variable argument list.
3588          *
3589          * @param $name string
3590          * @param $args array
3591          */
3592         public function addWikiMsgArray( $name, $args ) {
3593                 $this->addHTML( $this->msg( $name, $args )->parseAsBlock() );
3594         }
3595
3596         /**
3597          * This function takes a number of message/argument specifications, wraps them in
3598          * some overall structure, and then parses the result and adds it to the output.
3599          *
3600          * In the $wrap, $1 is replaced with the first message, $2 with the second, and so
3601          * on. The subsequent arguments may either be strings, in which case they are the
3602          * message names, or arrays, in which case the first element is the message name,
3603          * and subsequent elements are the parameters to that message.
3604          *
3605          * Don't use this for messages that are not in users interface language.
3606          *
3607          * For example:
3608          *
3609          *    $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>", 'some-error' );
3610          *
3611          * Is equivalent to:
3612          *
3613          *    $wgOut->addWikiText( "<div class='error'>\n" . wfMessage( 'some-error' )->plain() . "\n</div>" );
3614          *
3615          * The newline after opening div is needed in some wikitext. See bug 19226.
3616          *
3617          * @param $wrap string
3618          */
3619         public function wrapWikiMsg( $wrap /*, ...*/ ) {
3620                 $msgSpecs = func_get_args();
3621                 array_shift( $msgSpecs );
3622                 $msgSpecs = array_values( $msgSpecs );
3623                 $s = $wrap;
3624                 foreach ( $msgSpecs as $n => $spec ) {
3625                         if ( is_array( $spec ) ) {
3626                                 $args = $spec;
3627                                 $name = array_shift( $args );
3628                                 if ( isset( $args['options'] ) ) {
3629                                         unset( $args['options'] );
3630                                         wfDeprecated(
3631                                                 'Adding "options" to ' . __METHOD__ . ' is no longer supported',
3632                                                 '1.20'
3633                                         );
3634                                 }
3635                         } else {
3636                                 $args = array();
3637                                 $name = $spec;
3638                         }
3639                         $s = str_replace( '$' . ( $n + 1 ), $this->msg( $name, $args )->plain(), $s );
3640                 }
3641                 $this->addWikiText( $s );
3642         }
3643
3644         /**
3645          * Include jQuery core. Use this to avoid loading it multiple times
3646          * before we get a usable script loader.
3647          *
3648          * @param array $modules list of jQuery modules which should be loaded
3649          * @return Array: the list of modules which were not loaded.
3650          * @since 1.16
3651          * @deprecated since 1.17
3652          */
3653         public function includeJQuery( $modules = array() ) {
3654                 return array();
3655         }
3656
3657         /**
3658          * Enables/disables TOC, doesn't override __NOTOC__
3659          * @param bool $flag
3660          * @since 1.22
3661          */
3662         public function enableTOC( $flag = true ) {
3663                 $this->mEnableTOC = $flag;
3664         }
3665
3666         /**
3667          * @return bool
3668          * @since 1.22
3669          */
3670         public function isTOCEnabled() {
3671                 return $this->mEnableTOC;
3672         }
3673 }