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         /// "<meta keywords='stuff'>" most of the time the first 10 links to an article
  43         var $mKeywords = array();
  44
  45         var $mLinktags = array();
  46
  47         /// Additional stylesheets. Looks like this is for extensions. Might be replaced by resource loader.
  48         var $mExtStyles = array();
  49
  50         /// Should be private - has getter and setter. Contains the HTML title
  51         var $mPagetitle = '';
  52
  53         /// Contains all of the "<body>" content. Should be private we got set/get accessors and the append() method.
  54         var $mBodytext = '';
  55
  56         /**
  57          * Holds the debug lines that will be output as comments in page source if
  58          * $wgDebugComments is enabled. See also $wgShowDebug.
  59          * @deprecated since 1.20; use MWDebug class instead.
  60          */
  61         public $mDebugtext = '';
  62
  63         /// Should be private. Stores contents of "<title>" tag
  64         var $mHTMLtitle = '';
  65
  66         /// Should be private. Is the displayed content related to the source of the corresponding wiki article.
  67         var $mIsarticle = false;
  68
  69         /**
  70          * Should be private. Has get/set methods properly documented.
  71          * Stores "article flag" toggle.
  72          */
  73         var $mIsArticleRelated = true;
  74
  75         /**
  76          * Should be private. We have to set isPrintable(). Some pages should
  77          * never be printed (ex: redirections).
  78          */
  79         var $mPrintable = false;
  80
  81         /**
  82          * Should be private. We have set/get/append methods.
  83          *
  84          * Contains the page subtitle. Special pages usually have some links here.
  85          * Don't confuse with site subtitle added by skins.
  86          */
  87         private $mSubtitle = array();
  88
  89         var $mRedirect = '';
  90         var $mStatusCode;
  91
  92         /**
  93          * mLastModified and mEtag are used for sending cache control.
  94          * The whole caching system should probably be moved into its own class.
  95          */
  96         var $mLastModified = '';
  97
  98         /**
  99          * Should be private. No getter but used in sendCacheControl();
 100          * Contains an HTTP Entity Tags (see RFC 2616 section 3.13) which is used
 101          * as a unique identifier for the content. It is later used by the client
 102          * to compare its cached version with the server version. Client sends
 103          * headers If-Match and If-None-Match containing its locally cached ETAG value.
 104          *
 105          * To get more information, you will have to look at HTTP/1.1 protocol which
 106          * is properly described in RFC 2616 : http://tools.ietf.org/html/rfc2616
 107          */
 108         var $mETag = false;
 109
 110         var $mCategoryLinks = array();
 111         var $mCategories = array();
 112
 113         /// Should be private. Array of Interwiki Prefixed (non DB key) Titles (e.g. 'fr:Test page')
 114         var $mLanguageLinks = array();
 115
 116         /**
 117          * Should be private. Used for JavaScript (pre resource loader)
 118          * We should split js / css.
 119          * mScripts content is inserted as is in "<head>" by Skin. This might
 120          * contains either a link to a stylesheet or inline css.
 121          */
 122         var $mScripts = '';
 123
 124         /**
 125          * Inline CSS styles. Use addInlineStyle() sparsingly
 126          */
 127         var $mInlineStyles = '';
 128
 129         //
 130         var $mLinkColours;
 131
 132         /**
 133          * Used by skin template.
 134          * Example: $tpl->set( 'displaytitle', $out->mPageLinkTitle );
 135          */
 136         var $mPageLinkTitle = '';
 137
 138         /// Array of elements in "<head>". Parser might add its own headers!
 139         var $mHeadItems = array();
 140
 141         // @todo FIXME: Next variables probably comes from the resource loader
 142         var $mModules = array(), $mModuleScripts = array(), $mModuleStyles = array(), $mModuleMessages = array();
 143         var $mResourceLoader;
 144         var $mJsConfigVars = array();
 145
 146         /** @todo FIXME: Is this still used ?*/
 147         var $mInlineMsg = array();
 148
 149         var $mTemplateIds = array();
 150         var $mImageTimeKeys = array();
 151
 152         var $mRedirectCode = '';
 153
 154         var $mFeedLinksAppendQuery = null;
 155
 156         # What level of 'untrustworthiness' is allowed in CSS/JS modules loaded on this page?
 157         # @see ResourceLoaderModule::$origin
 158         # ResourceLoaderModule::ORIGIN_ALL is assumed unless overridden;
 159         protected $mAllowedModules = array(
 160                 ResourceLoaderModule::TYPE_COMBINED => ResourceLoaderModule::ORIGIN_ALL,
 161         );
 162
 163         /**
 164          * @EasterEgg I just love the name for this self documenting variable.
 165          * @todo document
 166          */
 167         var $mDoNothing = false;
 168
 169         // Parser related.
 170         var $mContainsOldMagic = 0, $mContainsNewMagic = 0;
 171
 172         /**
 173          * lazy initialised, use parserOptions()
 174          * @var ParserOptions
 175          */
 176         protected $mParserOptions = null;
 177
 178         /**
 179          * Handles the atom / rss links.
 180          * We probably only support atom in 2011.
 181          * Looks like a private variable.
 182          * @see $wgAdvertisedFeedTypes
 183          */
 184         var $mFeedLinks = array();
 185
 186         // Gwicke work on squid caching? Roughly from 2003.
 187         var $mEnableClientCache = true;
 188
 189         /**
 190          * Flag if output should only contain the body of the article.
 191          * Should be private.
 192          */
 193         var $mArticleBodyOnly = false;
 194
 195         var $mNewSectionLink = false;
 196         var $mHideNewSectionLink = false;
 197
 198         /**
 199          * Comes from the parser. This was probably made to load CSS/JS only
 200          * if we had "<gallery>". Used directly in CategoryPage.php
 201          * Looks like resource loader can replace this.
 202          */
 203         var $mNoGallery = false;
 204
 205         // should be private.
 206         var $mPageTitleActionText = '';
 207         var $mParseWarnings = array();
 208
 209         // Cache stuff. Looks like mEnableClientCache
 210         var $mSquidMaxage = 0;
 211
 212         // @todo document
 213         var $mPreventClickjacking = true;
 214
 215         /// should be private. To include the variable {{REVISIONID}}
 216         var $mRevisionId = null;
 217         private $mRevisionTimestamp = null;
 218
 219         var $mFileVersion = null;
 220
 221         /**
 222          * An array of stylesheet filenames (relative from skins path), with options
 223          * for CSS media, IE conditions, and RTL/LTR direction.
 224          * For internal use; add settings in the skin via $this->addStyle()
 225          *
 226          * Style again! This seems like a code duplication since we already have
 227          * mStyles. This is what makes OpenSource amazing.
 228          */
 229         var $styles = array();
 230
 231         /**
 232          * Whether jQuery is already handled.
 233          */
 234         protected $mJQueryDone = false;
 235
 236         private $mIndexPolicy = 'index';
 237         private $mFollowPolicy = 'follow';
 238         private $mVaryHeader = array(
 239                 'Accept-Encoding' => array( 'list-contains=gzip' ),
 240         );
 241
 242         /**
 243          * If the current page was reached through a redirect, $mRedirectedFrom contains the Title
 244          * of the redirect.
 245          *
 246          * @var Title
 247          */
 248         private $mRedirectedFrom = null;
 249
 250         /**
 251          * Constructor for OutputPage. This should not be called directly.
 252          * Instead a new RequestContext should be created and it will implicitly create
 253          * a OutputPage tied to that context.
 254          */
 255         function __construct( IContextSource $context = null ) {
 256                 if ( $context === null ) {
 257                         # Extensions should use `new RequestContext` instead of `new OutputPage` now.
 258                         wfDeprecated( __METHOD__, '1.18' );
 259                 } else {
 260                         $this->setContext( $context );
 261                 }
 262         }
 263
 264         /**
 265          * Redirect to $url rather than displaying the normal page
 266          *
 267          * @param $url String: URL
 268          * @param $responsecode String: HTTP status code
 269          */
 270         public function redirect( $url, $responsecode = '302' ) {
 271                 # Strip newlines as a paranoia check for header injection in PHP<5.1.2
 272                 $this->mRedirect = str_replace( "\n", '', $url );
 273                 $this->mRedirectCode = $responsecode;
 274         }
 275
 276         /**
 277          * Get the URL to redirect to, or an empty string if not redirect URL set
 278          *
 279          * @return String
 280          */
 281         public function getRedirect() {
 282                 return $this->mRedirect;
 283         }
 284
 285         /**
 286          * Set the HTTP status code to send with the output.
 287          *
 288          * @param $statusCode Integer
 289          */
 290         public function setStatusCode( $statusCode ) {
 291                 $this->mStatusCode = $statusCode;
 292         }
 293
 294         /**
 295          * Add a new "<meta>" tag
 296          * To add an http-equiv meta tag, precede the name with "http:"
 297          *
 298          * @param $name String tag name
 299          * @param $val String tag value
 300          */
 301         function addMeta( $name, $val ) {
 302                 array_push( $this->mMetatags, array( $name, $val ) );
 303         }
 304
 305         /**
 306          * Add a keyword or a list of keywords in the page header
 307          *
 308          * @param $text String or array of strings
 309          */
 310         function addKeyword( $text ) {
 311                 if( is_array( $text ) ) {
 312                         $this->mKeywords = array_merge( $this->mKeywords, $text );
 313                 } else {
 314                         array_push( $this->mKeywords, $text );
 315                 }
 316         }
 317
 318         /**
 319          * Add a new \<link\> tag to the page header
 320          *
 321          * @param $linkarr Array: associative array of attributes.
 322          */
 323         function addLink( $linkarr ) {
 324                 array_push( $this->mLinktags, $linkarr );
 325         }
 326
 327         /**
 328          * Add a new \<link\> with "rel" attribute set to "meta"
 329          *
 330          * @param $linkarr Array: associative array mapping attribute names to their
 331          *                 values, both keys and values will be escaped, and the
 332          *                 "rel" attribute will be automatically added
 333          */
 334         function addMetadataLink( $linkarr ) {
 335                 $linkarr['rel'] = $this->getMetadataAttribute();
 336                 $this->addLink( $linkarr );
 337         }
 338
 339         /**
 340          * Get the value of the "rel" attribute for metadata links
 341          *
 342          * @return String
 343          */
 344         public function getMetadataAttribute() {
 345                 # note: buggy CC software only reads first "meta" link
 346                 static $haveMeta = false;
 347                 if ( $haveMeta ) {
 348                         return 'alternate meta';
 349                 } else {
 350                         $haveMeta = true;
 351                         return 'meta';
 352                 }
 353         }
 354
 355         /**
 356          * Add raw HTML to the list of scripts (including \<script\> tag, etc.)
 357          *
 358          * @param $script String: raw HTML
 359          */
 360         function addScript( $script ) {
 361                 $this->mScripts .= $script . "\n";
 362         }
 363
 364         /**
 365          * Register and add a stylesheet from an extension directory.
 366          *
 367          * @param $url String path to sheet.  Provide either a full url (beginning
 368          *             with 'http', etc) or a relative path from the document root
 369          *             (beginning with '/').  Otherwise it behaves identically to
 370          *             addStyle() and draws from the /skins folder.
 371          */
 372         public function addExtensionStyle( $url ) {
 373                 array_push( $this->mExtStyles, $url );
 374         }
 375
 376         /**
 377          * Get all styles added by extensions
 378          *
 379          * @return Array
 380          */
 381         function getExtStyle() {
 382                 return $this->mExtStyles;
 383         }
 384
 385         /**
 386          * Add a JavaScript file out of skins/common, or a given relative path.
 387          *
 388          * @param $file String: filename in skins/common or complete on-server path
 389          *              (/foo/bar.js)
 390          * @param $version String: style version of the file. Defaults to $wgStyleVersion
 391          */
 392         public function addScriptFile( $file, $version = null ) {
 393                 global $wgStylePath, $wgStyleVersion;
 394                 // See if $file parameter is an absolute URL or begins with a slash
 395                 if( substr( $file, 0, 1 ) == '/' || preg_match( '#^[a-z]*://#i', $file ) ) {
 396                         $path = $file;
 397                 } else {
 398                         $path = "{$wgStylePath}/common/{$file}";
 399                 }
 400                 if ( is_null( $version ) )
 401                         $version = $wgStyleVersion;
 402                 $this->addScript( Html::linkedScript( wfAppendQuery( $path, $version ) ) );
 403         }
 404
 405         /**
 406          * Add a self-contained script tag with the given contents
 407          *
 408          * @param $script String: JavaScript text, no "<script>" tags
 409          */
 410         public function addInlineScript( $script ) {
 411                 $this->mScripts .= Html::inlineScript( "\n$script\n" ) . "\n";
 412         }
 413
 414         /**
 415          * Get all registered JS and CSS tags for the header.
 416          *
 417          * @return String
 418          */
 419         function getScript() {
 420                 return $this->mScripts . $this->getHeadItems();
 421         }
 422
 423         /**
 424          * Filter an array of modules to remove insufficiently trustworthy members, and modules
 425          * which are no longer registered (eg a page is cached before an extension is disabled)
 426          * @param $modules Array
 427          * @param $position String if not null, only return modules with this position
 428          * @param $type string
 429          * @return Array
 430          */
 431         protected function filterModules( $modules, $position = null, $type = ResourceLoaderModule::TYPE_COMBINED ) {
 432                 $resourceLoader = $this->getResourceLoader();
 433                 $filteredModules = array();
 434                 foreach( $modules as $val ){
 435                         $module = $resourceLoader->getModule( $val );
 436                         if( $module instanceof ResourceLoaderModule
 437                                 && $module->getOrigin() <= $this->getAllowedModules( $type )
 438                                 && ( is_null( $position ) || $module->getPosition() == $position ) )
 439                         {
 440                                 $filteredModules[] = $val;
 441                         }
 442                 }
 443                 return $filteredModules;
 444         }
 445
 446         /**
 447          * Get the list of modules to include on this page
 448          *
 449          * @param $filter Bool whether to filter out insufficiently trustworthy modules
 450          * @param $position String if not null, only return modules with this position
 451          * @param $param string
 452          * @return Array of module names
 453          */
 454         public function getModules( $filter = false, $position = null, $param = 'mModules' ) {
 455                 $modules = array_values( array_unique( $this->$param ) );
 456                 return $filter
 457                         ? $this->filterModules( $modules, $position )
 458                         : $modules;
 459         }
 460
 461         /**
 462          * Add one or more modules recognized by the resource loader. Modules added
 463          * through this function will be loaded by the resource loader when the
 464          * page loads.
 465          *
 466          * @param $modules Mixed: module name (string) or array of module names
 467          */
 468         public function addModules( $modules ) {
 469                 $this->mModules = array_merge( $this->mModules, (array)$modules );
 470         }
 471
 472         /**
 473          * Get the list of module JS to include on this page
 474          *
 475          * @param $filter
 476          * @param $position
 477          *
 478          * @return array of module names
 479          */
 480         public function getModuleScripts( $filter = false, $position = null ) {
 481                 return $this->getModules( $filter, $position, 'mModuleScripts' );
 482         }
 483
 484         /**
 485          * Add only JS of one or more modules recognized by the resource loader. Module
 486          * scripts added through this function will be loaded by the resource loader when
 487          * the page loads.
 488          *
 489          * @param $modules Mixed: module name (string) or array of module names
 490          */
 491         public function addModuleScripts( $modules ) {
 492                 $this->mModuleScripts = array_merge( $this->mModuleScripts, (array)$modules );
 493         }
 494
 495         /**
 496          * Get the list of module CSS to include on this page
 497          *
 498          * @param $filter
 499          * @param $position
 500          *
 501          * @return Array of module names
 502          */
 503         public function getModuleStyles( $filter = false, $position = null ) {
 504                 return $this->getModules( $filter,  $position, 'mModuleStyles' );
 505         }
 506
 507         /**
 508          * Add only CSS of one or more modules recognized by the resource loader. Module
 509          * styles added through this function will be loaded by the resource loader when
 510          * the page loads.
 511          *
 512          * @param $modules Mixed: module name (string) or array of module names
 513          */
 514         public function addModuleStyles( $modules ) {
 515                 $this->mModuleStyles = array_merge( $this->mModuleStyles, (array)$modules );
 516         }
 517
 518         /**
 519          * Get the list of module messages to include on this page
 520          *
 521          * @param $filter
 522          * @param $position
 523          *
 524          * @return Array of module names
 525          */
 526         public function getModuleMessages( $filter = false, $position = null ) {
 527                 return $this->getModules( $filter, $position, 'mModuleMessages' );
 528         }
 529
 530         /**
 531          * Add only messages of one or more modules recognized by the resource loader.
 532          * Module messages added through this function will be loaded by the resource
 533          * loader when the page loads.
 534          *
 535          * @param $modules Mixed: module name (string) or array of module names
 536          */
 537         public function addModuleMessages( $modules ) {
 538                 $this->mModuleMessages = array_merge( $this->mModuleMessages, (array)$modules );
 539         }
 540
 541         /**
 542          * Get an array of head items
 543          *
 544          * @return Array
 545          */
 546         function getHeadItemsArray() {
 547                 return $this->mHeadItems;
 548         }
 549
 550         /**
 551          * Get all header items in a string
 552          *
 553          * @return String
 554          */
 555         function getHeadItems() {
 556                 $s = '';
 557                 foreach ( $this->mHeadItems as $item ) {
 558                         $s .= $item;
 559                 }
 560                 return $s;
 561         }
 562
 563         /**
 564          * Add or replace an header item to the output
 565          *
 566          * @param $name String: item name
 567          * @param $value String: raw HTML
 568          */
 569         public function addHeadItem( $name, $value ) {
 570                 $this->mHeadItems[$name] = $value;
 571         }
 572
 573         /**
 574          * Check if the header item $name is already set
 575          *
 576          * @param $name String: item name
 577          * @return Boolean
 578          */
 579         public function hasHeadItem( $name ) {
 580                 return isset( $this->mHeadItems[$name] );
 581         }
 582
 583         /**
 584          * Set the value of the ETag HTTP header, only used if $wgUseETag is true
 585          *
 586          * @param $tag String: value of "ETag" header
 587          */
 588         function setETag( $tag ) {
 589                 $this->mETag = $tag;
 590         }
 591
 592         /**
 593          * Set whether the output should only contain the body of the article,
 594          * without any skin, sidebar, etc.
 595          * Used e.g. when calling with "action=render".
 596          *
 597          * @param $only Boolean: whether to output only the body of the article
 598          */
 599         public function setArticleBodyOnly( $only ) {
 600                 $this->mArticleBodyOnly = $only;
 601         }
 602
 603         /**
 604          * Return whether the output will contain only the body of the article
 605          *
 606          * @return Boolean
 607          */
 608         public function getArticleBodyOnly() {
 609                 return $this->mArticleBodyOnly;
 610         }
 611
 612         /**
 613          * checkLastModified tells the client to use the client-cached page if
 614          * possible. If successful, the OutputPage is disabled so that
 615          * any future call to OutputPage->output() have no effect.
 616          *
 617          * Side effect: sets mLastModified for Last-Modified header
 618          *
 619          * @param $timestamp string
 620          *
 621          * @return Boolean: true iff cache-ok headers was sent.
 622          */
 623         public function checkLastModified( $timestamp ) {
 624                 global $wgCachePages, $wgCacheEpoch;
 625
 626                 if ( !$timestamp || $timestamp == '19700101000000' ) {
 627                         wfDebug( __METHOD__ . ": CACHE DISABLED, NO TIMESTAMP\n" );
 628                         return false;
 629                 }
 630                 if( !$wgCachePages ) {
 631                         wfDebug( __METHOD__ . ": CACHE DISABLED\n", false );
 632                         return false;
 633                 }
 634                 if( $this->getUser()->getOption( 'nocache' ) ) {
 635                         wfDebug( __METHOD__ . ": USER DISABLED CACHE\n", false );
 636                         return false;
 637                 }
 638
 639                 $timestamp = wfTimestamp( TS_MW, $timestamp );
 640                 $modifiedTimes = array(
 641                         'page' => $timestamp,
 642                         'user' => $this->getUser()->getTouched(),
 643                         'epoch' => $wgCacheEpoch
 644                 );
 645                 wfRunHooks( 'OutputPageCheckLastModified', array( &$modifiedTimes ) );
 646
 647                 $maxModified = max( $modifiedTimes );
 648                 $this->mLastModified = wfTimestamp( TS_RFC2822, $maxModified );
 649
 650                 $clientHeader = $this->getRequest()->getHeader( 'If-Modified-Since' );
 651                 if ( $clientHeader === false ) {
 652                         wfDebug( __METHOD__ . ": client did not send If-Modified-Since header\n", false );
 653                         return false;
 654                 }
 655
 656                 # IE sends sizes after the date like this:
 657                 # Wed, 20 Aug 2003 06:51:19 GMT; length=5202
 658                 # this breaks strtotime().
 659                 $clientHeader = preg_replace( '/;.*$/', '', $clientHeader );
 660
 661                 wfSuppressWarnings(); // E_STRICT system time bitching
 662                 $clientHeaderTime = strtotime( $clientHeader );
 663                 wfRestoreWarnings();
 664                 if ( !$clientHeaderTime ) {
 665                         wfDebug( __METHOD__ . ": unable to parse the client's If-Modified-Since header: $clientHeader\n" );
 666                         return false;
 667                 }
 668                 $clientHeaderTime = wfTimestamp( TS_MW, $clientHeaderTime );
 669
 670                 # Make debug info
 671                 $info = '';
 672                 foreach ( $modifiedTimes as $name => $value ) {
 673                         if ( $info !== '' ) {
 674                                 $info .= ', ';
 675                         }
 676                         $info .= "$name=" . wfTimestamp( TS_ISO_8601, $value );
 677                 }
 678
 679                 wfDebug( __METHOD__ . ": client sent If-Modified-Since: " .
 680                         wfTimestamp( TS_ISO_8601, $clientHeaderTime ) . "\n", false );
 681                 wfDebug( __METHOD__ . ": effective Last-Modified: " .
 682                         wfTimestamp( TS_ISO_8601, $maxModified ) . "\n", false );
 683                 if( $clientHeaderTime < $maxModified ) {
 684                         wfDebug( __METHOD__ . ": STALE, $info\n", false );
 685                         return false;
 686                 }
 687
 688                 # Not modified
 689                 # Give a 304 response code and disable body output
 690                 wfDebug( __METHOD__ . ": NOT MODIFIED, $info\n", false );
 691                 ini_set( 'zlib.output_compression', 0 );
 692                 $this->getRequest()->response()->header( "HTTP/1.1 304 Not Modified" );
 693                 $this->sendCacheControl();
 694                 $this->disable();
 695
 696                 // Don't output a compressed blob when using ob_gzhandler;
 697                 // it's technically against HTTP spec and seems to confuse
 698                 // Firefox when the response gets split over two packets.
 699                 wfClearOutputBuffers();
 700
 701                 return true;
 702         }
 703
 704         /**
 705          * Override the last modified timestamp
 706          *
 707          * @param $timestamp String: new timestamp, in a format readable by
 708          *        wfTimestamp()
 709          */
 710         public function setLastModified( $timestamp ) {
 711                 $this->mLastModified = wfTimestamp( TS_RFC2822, $timestamp );
 712         }
 713
 714         /**
 715          * Set the robot policy for the page: <http://www.robotstxt.org/meta.html>
 716          *
 717          * @param $policy String: the literal string to output as the contents of
 718          *   the meta tag.  Will be parsed according to the spec and output in
 719          *   standardized form.
 720          * @return null
 721          */
 722         public function setRobotPolicy( $policy ) {
 723                 $policy = Article::formatRobotPolicy( $policy );
 724
 725                 if( isset( $policy['index'] ) ) {
 726                         $this->setIndexPolicy( $policy['index'] );
 727                 }
 728                 if( isset( $policy['follow'] ) ) {
 729                         $this->setFollowPolicy( $policy['follow'] );
 730                 }
 731         }
 732
 733         /**
 734          * Set the index policy for the page, but leave the follow policy un-
 735          * touched.
 736          *
 737          * @param $policy string Either 'index' or 'noindex'.
 738          * @return null
 739          */
 740         public function setIndexPolicy( $policy ) {
 741                 $policy = trim( $policy );
 742                 if( in_array( $policy, array( 'index', 'noindex' ) ) ) {
 743                         $this->mIndexPolicy = $policy;
 744                 }
 745         }
 746
 747         /**
 748          * Set the follow policy for the page, but leave the index policy un-
 749          * touched.
 750          *
 751          * @param $policy String: either 'follow' or 'nofollow'.
 752          * @return null
 753          */
 754         public function setFollowPolicy( $policy ) {
 755                 $policy = trim( $policy );
 756                 if( in_array( $policy, array( 'follow', 'nofollow' ) ) ) {
 757                         $this->mFollowPolicy = $policy;
 758                 }
 759         }
 760
 761         /**
 762          * Set the new value of the "action text", this will be added to the
 763          * "HTML title", separated from it with " - ".
 764          *
 765          * @param $text String: new value of the "action text"
 766          */
 767         public function setPageTitleActionText( $text ) {
 768                 $this->mPageTitleActionText = $text;
 769         }
 770
 771         /**
 772          * Get the value of the "action text"
 773          *
 774          * @return String
 775          */
 776         public function getPageTitleActionText() {
 777                 if ( isset( $this->mPageTitleActionText ) ) {
 778                         return $this->mPageTitleActionText;
 779                 }
 780                 return '';
 781         }
 782
 783         /**
 784          * "HTML title" means the contents of "<title>".
 785          * It is stored as plain, unescaped text and will be run through htmlspecialchars in the skin file.
 786          *
 787          * @param $name string
 788          */
 789         public function setHTMLTitle( $name ) {
 790                 if ( $name instanceof Message ) {
 791                         $this->mHTMLtitle = $name->setContext( $this->getContext() )->text();
 792                 } else {
 793                         $this->mHTMLtitle = $name;
 794                 }
 795         }
 796
 797         /**
 798          * Return the "HTML title", i.e. the content of the "<title>" tag.
 799          *
 800          * @return String
 801          */
 802         public function getHTMLTitle() {
 803                 return $this->mHTMLtitle;
 804         }
 805
 806         /**
 807          * Set $mRedirectedFrom, the Title of the page which redirected us to the current page.
 808          *
 809          * @param $t Title
 810          */
 811         public function setRedirectedFrom( $t ) {
 812                 $this->mRedirectedFrom = $t;
 813         }
 814
 815         /**
 816          * "Page title" means the contents of \<h1\>. It is stored as a valid HTML fragment.
 817          * This function allows good tags like \<sup\> in the \<h1\> tag, but not bad tags like \<script\>.
 818          * This function automatically sets \<title\> to the same content as \<h1\> but with all tags removed.
 819          * Bad tags that were escaped in \<h1\> will still be escaped in \<title\>, and good tags like \<i\> will be dropped entirely.
 820          *
 821          * @param $name string|Message
 822          */
 823         public function setPageTitle( $name ) {
 824                 if ( $name instanceof Message ) {
 825                         $name = $name->setContext( $this->getContext() )->text();
 826                 }
 827
 828                 # change "<script>foo&bar</script>" to "&lt;script&gt;foo&amp;bar&lt;/script&gt;"
 829                 # but leave "<i>foobar</i>" alone
 830                 $nameWithTags = Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags( $name ) );
 831                 $this->mPagetitle = $nameWithTags;
 832
 833                 # change "<i>foo&amp;bar</i>" to "foo&bar"
 834                 $this->setHTMLTitle( $this->msg( 'pagetitle' )->rawParams( Sanitizer::stripAllTags( $nameWithTags ) ) );
 835         }
 836
 837         /**
 838          * Return the "page title", i.e. the content of the \<h1\> tag.
 839          *
 840          * @return String
 841          */
 842         public function getPageTitle() {
 843                 return $this->mPagetitle;
 844         }
 845
 846         /**
 847          * Set the Title object to use
 848          *
 849          * @param $t Title object
 850          */
 851         public function setTitle( Title $t ) {
 852                 $this->getContext()->setTitle( $t );
 853         }
 854
 855         /**
 856          * Replace the subtile with $str
 857          *
 858          * @param $str String|Message: new value of the subtitle. String should be safe HTML.
 859          */
 860         public function setSubtitle( $str ) {
 861                 $this->clearSubtitle();
 862                 $this->addSubtitle( $str );
 863         }
 864
 865         /**
 866          * Add $str to the subtitle
 867          *
 868          * @deprecated in 1.19; use addSubtitle() instead
 869          * @param $str String|Message to add to the subtitle
 870          */
 871         public function appendSubtitle( $str ) {
 872                 $this->addSubtitle( $str );
 873         }
 874
 875         /**
 876          * Add $str to the subtitle
 877          *
 878          * @param $str String|Message to add to the subtitle. String should be safe HTML.
 879          */
 880         public function addSubtitle( $str ) {
 881                 if ( $str instanceof Message ) {
 882                         $this->mSubtitle[] = $str->setContext( $this->getContext() )->parse();
 883                 } else {
 884                         $this->mSubtitle[] = $str;
 885                 }
 886         }
 887
 888         /**
 889          * Add a subtitle containing a backlink to a page
 890          *
 891          * @param $title Title to link to
 892          */
 893         public function addBacklinkSubtitle( Title $title ) {
 894                 $query = array();
 895                 if ( $title->isRedirect() ) {
 896                         $query['redirect'] = 'no';
 897                 }
 898                 $this->addSubtitle( $this->msg( 'backlinksubtitle' )->rawParams( Linker::link( $title, null, array(), $query ) ) );
 899         }
 900
 901         /**
 902          * Clear the subtitles
 903          */
 904         public function clearSubtitle() {
 905                 $this->mSubtitle = array();
 906         }
 907
 908         /**
 909          * Get the subtitle
 910          *
 911          * @return String
 912          */
 913         public function getSubtitle() {
 914                 return implode( "<br />\n\t\t\t\t", $this->mSubtitle );
 915         }
 916
 917         /**
 918          * Set the page as printable, i.e. it'll be displayed with with all
 919          * print styles included
 920          */
 921         public function setPrintable() {
 922                 $this->mPrintable = true;
 923         }
 924
 925         /**
 926          * Return whether the page is "printable"
 927          *
 928          * @return Boolean
 929          */
 930         public function isPrintable() {
 931                 return $this->mPrintable;
 932         }
 933
 934         /**
 935          * Disable output completely, i.e. calling output() will have no effect
 936          */
 937         public function disable() {
 938                 $this->mDoNothing = true;
 939         }
 940
 941         /**
 942          * Return whether the output will be completely disabled
 943          *
 944          * @return Boolean
 945          */
 946         public function isDisabled() {
 947                 return $this->mDoNothing;
 948         }
 949
 950         /**
 951          * Show an "add new section" link?
 952          *
 953          * @return Boolean
 954          */
 955         public function showNewSectionLink() {
 956                 return $this->mNewSectionLink;
 957         }
 958
 959         /**
 960          * Forcibly hide the new section link?
 961          *
 962          * @return Boolean
 963          */
 964         public function forceHideNewSectionLink() {
 965                 return $this->mHideNewSectionLink;
 966         }
 967
 968         /**
 969          * Add or remove feed links in the page header
 970          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
 971          * for the new version
 972          * @see addFeedLink()
 973          *
 974          * @param $show Boolean: true: add default feeds, false: remove all feeds
 975          */
 976         public function setSyndicated( $show = true ) {
 977                 if ( $show ) {
 978                         $this->setFeedAppendQuery( false );
 979                 } else {
 980                         $this->mFeedLinks = array();
 981                 }
 982         }
 983
 984         /**
 985          * Add default feeds to the page header
 986          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
 987          * for the new version
 988          * @see addFeedLink()
 989          *
 990          * @param $val String: query to append to feed links or false to output
 991          *        default links
 992          */
 993         public function setFeedAppendQuery( $val ) {
 994                 global $wgAdvertisedFeedTypes;
 995
 996                 $this->mFeedLinks = array();
 997
 998                 foreach ( $wgAdvertisedFeedTypes as $type ) {
 999                         $query = "feed=$type";
1000                         if ( is_string( $val ) ) {
1001                                 $query .= '&' . $val;
1002                         }
1003                         $this->mFeedLinks[$type] = $this->getTitle()->getLocalURL( $query );
1004                 }
1005         }
1006
1007         /**
1008          * Add a feed link to the page header
1009          *
1010          * @param $format String: feed type, should be a key of $wgFeedClasses
1011          * @param $href String: URL
1012          */
1013         public function addFeedLink( $format, $href ) {
1014                 global $wgAdvertisedFeedTypes;
1015
1016                 if ( in_array( $format, $wgAdvertisedFeedTypes ) ) {
1017                         $this->mFeedLinks[$format] = $href;
1018                 }
1019         }
1020
1021         /**
1022          * Should we output feed links for this page?
1023          * @return Boolean
1024          */
1025         public function isSyndicated() {
1026                 return count( $this->mFeedLinks ) > 0;
1027         }
1028
1029         /**
1030          * Return URLs for each supported syndication format for this page.
1031          * @return array associating format keys with URLs
1032          */
1033         public function getSyndicationLinks() {
1034                 return $this->mFeedLinks;
1035         }
1036
1037         /**
1038          * Will currently always return null
1039          *
1040          * @return null
1041          */
1042         public function getFeedAppendQuery() {
1043                 return $this->mFeedLinksAppendQuery;
1044         }
1045
1046         /**
1047          * Set whether the displayed content is related to the source of the
1048          * corresponding article on the wiki
1049          * Setting true will cause the change "article related" toggle to true
1050          *
1051          * @param $v Boolean
1052          */
1053         public function setArticleFlag( $v ) {
1054                 $this->mIsarticle = $v;
1055                 if ( $v ) {
1056                         $this->mIsArticleRelated = $v;
1057                 }
1058         }
1059
1060         /**
1061          * Return whether the content displayed page is related to the source of
1062          * the corresponding article on the wiki
1063          *
1064          * @return Boolean
1065          */
1066         public function isArticle() {
1067                 return $this->mIsarticle;
1068         }
1069
1070         /**
1071          * Set whether this page is related an article on the wiki
1072          * Setting false will cause the change of "article flag" toggle to false
1073          *
1074          * @param $v Boolean
1075          */
1076         public function setArticleRelated( $v ) {
1077                 $this->mIsArticleRelated = $v;
1078                 if ( !$v ) {
1079                         $this->mIsarticle = false;
1080                 }
1081         }
1082
1083         /**
1084          * Return whether this page is related an article on the wiki
1085          *
1086          * @return Boolean
1087          */
1088         public function isArticleRelated() {
1089                 return $this->mIsArticleRelated;
1090         }
1091
1092         /**
1093          * Add new language links
1094          *
1095          * @param $newLinkArray array Associative array mapping language code to the page
1096          *                      name
1097          */
1098         public function addLanguageLinks( $newLinkArray ) {
1099                 $this->mLanguageLinks += $newLinkArray;
1100         }
1101
1102         /**
1103          * Reset the language links and add new language links
1104          *
1105          * @param $newLinkArray array Associative array mapping language code to the page
1106          *                      name
1107          */
1108         public function setLanguageLinks( $newLinkArray ) {
1109                 $this->mLanguageLinks = $newLinkArray;
1110         }
1111
1112         /**
1113          * Get the list of language links
1114          *
1115          * @return Array of Interwiki Prefixed (non DB key) Titles (e.g. 'fr:Test page')
1116          */
1117         public function getLanguageLinks() {
1118                 return $this->mLanguageLinks;
1119         }
1120
1121         /**
1122          * Add an array of categories, with names in the keys
1123          *
1124          * @param $categories Array mapping category name => sort key
1125          */
1126         public function addCategoryLinks( $categories ) {
1127                 global $wgContLang;
1128
1129                 if ( !is_array( $categories ) || count( $categories ) == 0 ) {
1130                         return;
1131                 }
1132
1133                 # Add the links to a LinkBatch
1134                 $arr = array( NS_CATEGORY => $categories );
1135                 $lb = new LinkBatch;
1136                 $lb->setArray( $arr );
1137
1138                 # Fetch existence plus the hiddencat property
1139                 $dbr = wfGetDB( DB_SLAVE );
1140                 $res = $dbr->select( array( 'page', 'page_props' ),
1141                         array( 'page_id', 'page_namespace', 'page_title', 'page_len', 'page_is_redirect', 'page_latest', 'pp_value' ),
1142                         $lb->constructSet( 'page', $dbr ),
1143                         __METHOD__,
1144                         array(),
1145                         array( 'page_props' => array( 'LEFT JOIN', array( 'pp_propname' => 'hiddencat', 'pp_page = page_id' ) ) )
1146                 );
1147
1148                 # Add the results to the link cache
1149                 $lb->addResultToCache( LinkCache::singleton(), $res );
1150
1151                 # Set all the values to 'normal'. This can be done with array_fill_keys in PHP 5.2.0+
1152                 $categories = array_combine(
1153                         array_keys( $categories ),
1154                         array_fill( 0, count( $categories ), 'normal' )
1155                 );
1156
1157                 # Mark hidden categories
1158                 foreach ( $res as $row ) {
1159                         if ( isset( $row->pp_value ) ) {
1160                                 $categories[$row->page_title] = 'hidden';
1161                         }
1162                 }
1163
1164                 # Add the remaining categories to the skin
1165                 if ( wfRunHooks( 'OutputPageMakeCategoryLinks', array( &$this, $categories, &$this->mCategoryLinks ) ) ) {
1166                         foreach ( $categories as $category => $type ) {
1167                                 $origcategory = $category;
1168                                 $title = Title::makeTitleSafe( NS_CATEGORY, $category );
1169                                 $wgContLang->findVariantLink( $category, $title, true );
1170                                 if ( $category != $origcategory ) {
1171                                         if ( array_key_exists( $category, $categories ) ) {
1172                                                 continue;
1173                                         }
1174                                 }
1175                                 $text = $wgContLang->convertHtml( $title->getText() );
1176                                 $this->mCategories[] = $title->getText();
1177                                 $this->mCategoryLinks[$type][] = Linker::link( $title, $text );
1178                         }
1179                 }
1180         }
1181
1182         /**
1183          * Reset the category links (but not the category list) and add $categories
1184          *
1185          * @param $categories Array mapping category name => sort key
1186          */
1187         public function setCategoryLinks( $categories ) {
1188                 $this->mCategoryLinks = array();
1189                 $this->addCategoryLinks( $categories );
1190         }
1191
1192         /**
1193          * Get the list of category links, in a 2-D array with the following format:
1194          * $arr[$type][] = $link, where $type is either "normal" or "hidden" (for
1195          * hidden categories) and $link a HTML fragment with a link to the category
1196          * page
1197          *
1198          * @return Array
1199          */
1200         public function getCategoryLinks() {
1201                 return $this->mCategoryLinks;
1202         }
1203
1204         /**
1205          * Get the list of category names this page belongs to
1206          *
1207          * @return Array of strings
1208          */
1209         public function getCategories() {
1210                 return $this->mCategories;
1211         }
1212
1213         /**
1214          * Do not allow scripts which can be modified by wiki users to load on this page;
1215          * only allow scripts bundled with, or generated by, the software.
1216          */
1217         public function disallowUserJs() {
1218                 $this->reduceAllowedModules(
1219                         ResourceLoaderModule::TYPE_SCRIPTS,
1220                         ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL
1221                 );
1222         }
1223
1224         /**
1225          * Return whether user JavaScript is allowed for this page
1226          * @deprecated since 1.18 Load modules with ResourceLoader, and origin and
1227          *     trustworthiness is identified and enforced automagically.
1228          *     Will be removed in 1.20.
1229          * @return Boolean
1230          */
1231         public function isUserJsAllowed() {
1232                 wfDeprecated( __METHOD__, '1.18' );
1233                 return $this->getAllowedModules( ResourceLoaderModule::TYPE_SCRIPTS ) >= ResourceLoaderModule::ORIGIN_USER_INDIVIDUAL;
1234         }
1235
1236         /**
1237          * Show what level of JavaScript / CSS untrustworthiness is allowed on this page
1238          * @see ResourceLoaderModule::$origin
1239          * @param $type String ResourceLoaderModule TYPE_ constant
1240          * @return Int ResourceLoaderModule ORIGIN_ class constant
1241          */
1242         public function getAllowedModules( $type ) {
1243                 if( $type == ResourceLoaderModule::TYPE_COMBINED ){
1244                         return min( array_values( $this->mAllowedModules ) );
1245                 } else {
1246                         return isset( $this->mAllowedModules[$type] )
1247                                 ? $this->mAllowedModules[$type]
1248                                 : ResourceLoaderModule::ORIGIN_ALL;
1249                 }
1250         }
1251
1252         /**
1253          * Set the highest level of CSS/JS untrustworthiness allowed
1254          * @param  $type String ResourceLoaderModule TYPE_ constant
1255          * @param  $level Int ResourceLoaderModule class constant
1256          */
1257         public function setAllowedModules( $type, $level ) {
1258                 $this->mAllowedModules[$type] = $level;
1259         }
1260
1261         /**
1262          * As for setAllowedModules(), but don't inadvertantly make the page more accessible
1263          * @param  $type String
1264          * @param  $level Int ResourceLoaderModule class constant
1265          */
1266         public function reduceAllowedModules( $type, $level ) {
1267                 $this->mAllowedModules[$type] = min( $this->getAllowedModules($type), $level );
1268         }
1269
1270         /**
1271          * Prepend $text to the body HTML
1272          *
1273          * @param $text String: HTML
1274          */
1275         public function prependHTML( $text ) {
1276                 $this->mBodytext = $text . $this->mBodytext;
1277         }
1278
1279         /**
1280          * Append $text to the body HTML
1281          *
1282          * @param $text String: HTML
1283          */
1284         public function addHTML( $text ) {
1285                 $this->mBodytext .= $text;
1286         }
1287
1288         /**
1289          * Shortcut for adding an Html::element via addHTML.
1290          *
1291          * @since 1.19
1292          *
1293          * @param $element string
1294          * @param $attribs array
1295          * @param $contents string
1296          */
1297         public function addElement( $element, $attribs = array(), $contents = '' ) {
1298                 $this->addHTML( Html::element( $element, $attribs, $contents ) );
1299         }
1300
1301         /**
1302          * Clear the body HTML
1303          */
1304         public function clearHTML() {
1305                 $this->mBodytext = '';
1306         }
1307
1308         /**
1309          * Get the body HTML
1310          *
1311          * @return String: HTML
1312          */
1313         public function getHTML() {
1314                 return $this->mBodytext;
1315         }
1316
1317         /**
1318          * Get/set the ParserOptions object to use for wikitext parsing
1319          *
1320          * @param $options ParserOptions|null either the ParserOption to use or null to only get the
1321          *                 current ParserOption object
1322          * @return ParserOptions object
1323          */
1324         public function parserOptions( $options = null ) {
1325                 if ( !$this->mParserOptions ) {
1326                         $this->mParserOptions = ParserOptions::newFromContext( $this->getContext() );
1327                         $this->mParserOptions->setEditSection( false );
1328                 }
1329                 return wfSetVar( $this->mParserOptions, $options );
1330         }
1331
1332         /**
1333          * Set the revision ID which will be seen by the wiki text parser
1334          * for things such as embedded {{REVISIONID}} variable use.
1335          *
1336          * @param $revid Mixed: an positive integer, or null
1337          * @return Mixed: previous value
1338          */
1339         public function setRevisionId( $revid ) {
1340                 $val = is_null( $revid ) ? null : intval( $revid );
1341                 return wfSetVar( $this->mRevisionId, $val );
1342         }
1343
1344         /**
1345          * Get the displayed revision ID
1346          *
1347          * @return Integer
1348          */
1349         public function getRevisionId() {
1350                 return $this->mRevisionId;
1351         }
1352
1353         /**
1354          * Set the timestamp of the revision which will be displayed. This is used
1355          * to avoid a extra DB call in Skin::lastModified().
1356          *
1357          * @param $timestamp Mixed: string, or null
1358          * @return Mixed: previous value
1359          */
1360         public function setRevisionTimestamp( $timestamp) {
1361                 return wfSetVar( $this->mRevisionTimestamp, $timestamp );
1362         }
1363
1364         /**
1365          * Get the timestamp of displayed revision.
1366          * This will be null if not filled by setRevisionTimestamp().
1367          *
1368          * @return String or null
1369          */
1370         public function getRevisionTimestamp() {
1371                 return $this->mRevisionTimestamp;
1372         }
1373
1374         /**
1375          * Set the displayed file version
1376          *
1377          * @param $file File|bool
1378          * @return Mixed: previous value
1379          */
1380         public function setFileVersion( $file ) {
1381                 $val = null;
1382                 if ( $file instanceof File && $file->exists() ) {
1383                         $val = array( 'time' => $file->getTimestamp(), 'sha1' => $file->getSha1() );
1384                 }
1385                 return wfSetVar( $this->mFileVersion, $val, true );
1386         }
1387
1388         /**
1389          * Get the displayed file version
1390          *
1391          * @return Array|null ('time' => MW timestamp, 'sha1' => sha1)
1392          */
1393         public function getFileVersion() {
1394                 return $this->mFileVersion;
1395         }
1396
1397         /**
1398          * Get the templates used on this page
1399          *
1400          * @return Array (namespace => dbKey => revId)
1401          * @since 1.18
1402          */
1403         public function getTemplateIds() {
1404                 return $this->mTemplateIds;
1405         }
1406
1407         /**
1408          * Get the files used on this page
1409          *
1410          * @return Array (dbKey => array('time' => MW timestamp or null, 'sha1' => sha1 or ''))
1411          * @since 1.18
1412          */
1413         public function getFileSearchOptions() {
1414                 return $this->mImageTimeKeys;
1415         }
1416
1417         /**
1418          * Convert wikitext to HTML and add it to the buffer
1419          * Default assumes that the current page title will be used.
1420          *
1421          * @param $text String
1422          * @param $linestart Boolean: is this the start of a line?
1423          * @param $interface Boolean: is this text in the user interface language?
1424          */
1425         public function addWikiText( $text, $linestart = true, $interface = true ) {
1426                 $title = $this->getTitle(); // Work arround E_STRICT
1427                 $this->addWikiTextTitle( $text, $title, $linestart, /*tidy*/false, $interface );
1428         }
1429
1430         /**
1431          * Add wikitext with a custom Title object
1432          *
1433          * @param $text String: wikitext
1434          * @param $title Title object
1435          * @param $linestart Boolean: is this the start of a line?
1436          */
1437         public function addWikiTextWithTitle( $text, &$title, $linestart = true ) {
1438                 $this->addWikiTextTitle( $text, $title, $linestart );
1439         }
1440
1441         /**
1442          * Add wikitext with a custom Title object and tidy enabled.
1443          *
1444          * @param $text String: wikitext
1445          * @param $title Title object
1446          * @param $linestart Boolean: is this the start of a line?
1447          */
1448         function addWikiTextTitleTidy( $text, &$title, $linestart = true ) {
1449                 $this->addWikiTextTitle( $text, $title, $linestart, true );
1450         }
1451
1452         /**
1453          * Add wikitext with tidy enabled
1454          *
1455          * @param $text String: wikitext
1456          * @param $linestart Boolean: is this the start of a line?
1457          */
1458         public function addWikiTextTidy( $text, $linestart = true ) {
1459                 $title = $this->getTitle();
1460                 $this->addWikiTextTitleTidy( $text, $title, $linestart );
1461         }
1462
1463         /**
1464          * Add wikitext with a custom Title object
1465          *
1466          * @param $text String: wikitext
1467          * @param $title Title object
1468          * @param $linestart Boolean: is this the start of a line?
1469          * @param $tidy Boolean: whether to use tidy
1470          * @param $interface Boolean: whether it is an interface message
1471          *                                                              (for example disables conversion)
1472          */
1473         public function addWikiTextTitle( $text, Title $title, $linestart, $tidy = false, $interface = false ) {
1474                 global $wgParser;
1475
1476                 wfProfileIn( __METHOD__ );
1477
1478                 $popts = $this->parserOptions();
1479                 $oldTidy = $popts->setTidy( $tidy );
1480                 $popts->setInterfaceMessage( (bool) $interface );
1481
1482                 $parserOutput = $wgParser->parse(
1483                         $text, $title, $popts,
1484                         $linestart, true, $this->mRevisionId
1485                 );
1486
1487                 $popts->setTidy( $oldTidy );
1488
1489                 $this->addParserOutput( $parserOutput );
1490
1491                 wfProfileOut( __METHOD__ );
1492         }
1493
1494         /**
1495          * Add a ParserOutput object, but without Html
1496          *
1497          * @param $parserOutput ParserOutput object
1498          */
1499         public function addParserOutputNoText( &$parserOutput ) {
1500                 $this->mLanguageLinks += $parserOutput->getLanguageLinks();
1501                 $this->addCategoryLinks( $parserOutput->getCategories() );
1502                 $this->mNewSectionLink = $parserOutput->getNewSection();
1503                 $this->mHideNewSectionLink = $parserOutput->getHideNewSection();
1504
1505                 $this->mParseWarnings = $parserOutput->getWarnings();
1506                 if ( !$parserOutput->isCacheable() ) {
1507                         $this->enableClientCache( false );
1508                 }
1509                 $this->mNoGallery = $parserOutput->getNoGallery();
1510                 $this->mHeadItems = array_merge( $this->mHeadItems, $parserOutput->getHeadItems() );
1511                 $this->addModules( $parserOutput->getModules() );
1512                 $this->addModuleScripts( $parserOutput->getModuleScripts() );
1513                 $this->addModuleStyles( $parserOutput->getModuleStyles() );
1514                 $this->addModuleMessages( $parserOutput->getModuleMessages() );
1515
1516                 // Template versioning...
1517                 foreach ( (array)$parserOutput->getTemplateIds() as $ns => $dbks ) {
1518                         if ( isset( $this->mTemplateIds[$ns] ) ) {
1519                                 $this->mTemplateIds[$ns] = $dbks + $this->mTemplateIds[$ns];
1520                         } else {
1521                                 $this->mTemplateIds[$ns] = $dbks;
1522                         }
1523                 }
1524                 // File versioning...
1525                 foreach ( (array)$parserOutput->getFileSearchOptions() as $dbk => $data ) {
1526                         $this->mImageTimeKeys[$dbk] = $data;
1527                 }
1528
1529                 // Hooks registered in the object
1530                 global $wgParserOutputHooks;
1531                 foreach ( $parserOutput->getOutputHooks() as $hookInfo ) {
1532                         list( $hookName, $data ) = $hookInfo;
1533                         if ( isset( $wgParserOutputHooks[$hookName] ) ) {
1534                                 call_user_func( $wgParserOutputHooks[$hookName], $this, $parserOutput, $data );
1535                         }
1536                 }
1537
1538                 wfRunHooks( 'OutputPageParserOutput', array( &$this, $parserOutput ) );
1539         }
1540
1541         /**
1542          * Add a ParserOutput object
1543          *
1544          * @param $parserOutput ParserOutput
1545          */
1546         function addParserOutput( &$parserOutput ) {
1547                 $this->addParserOutputNoText( $parserOutput );
1548                 $text = $parserOutput->getText();
1549                 wfRunHooks( 'OutputPageBeforeHTML', array( &$this, &$text ) );
1550                 $this->addHTML( $text );
1551         }
1552
1553
1554         /**
1555          * Add the output of a QuickTemplate to the output buffer
1556          *
1557          * @param $template QuickTemplate
1558          */
1559         public function addTemplate( &$template ) {
1560                 ob_start();
1561                 $template->execute();
1562                 $this->addHTML( ob_get_contents() );
1563                 ob_end_clean();
1564         }
1565
1566         /**
1567          * Parse wikitext and return the HTML.
1568          *
1569          * @param $text String
1570          * @param $linestart Boolean: is this the start of a line?
1571          * @param $interface Boolean: use interface language ($wgLang instead of
1572          *                   $wgContLang) while parsing language sensitive magic
1573          *                   words like GRAMMAR and PLURAL. This also disables
1574          *                   LanguageConverter.
1575          * @param $language  Language object: target language object, will override
1576          *                   $interface
1577          * @throws MWException
1578          * @return String: HTML
1579          */
1580         public function parse( $text, $linestart = true, $interface = false, $language = null ) {
1581                 global $wgParser;
1582
1583                 if( is_null( $this->getTitle() ) ) {
1584                         throw new MWException( 'Empty $mTitle in ' . __METHOD__ );
1585                 }
1586
1587                 $popts = $this->parserOptions();
1588                 if ( $interface ) {
1589                         $popts->setInterfaceMessage( true );
1590                 }
1591                 if ( $language !== null ) {
1592                         $oldLang = $popts->setTargetLanguage( $language );
1593                 }
1594
1595                 $parserOutput = $wgParser->parse(
1596                         $text, $this->getTitle(), $popts,
1597                         $linestart, true, $this->mRevisionId
1598                 );
1599
1600                 if ( $interface ) {
1601                         $popts->setInterfaceMessage( false );
1602                 }
1603                 if ( $language !== null ) {
1604                         $popts->setTargetLanguage( $oldLang );
1605                 }
1606
1607                 return $parserOutput->getText();
1608         }
1609
1610         /**
1611          * Parse wikitext, strip paragraphs, and return the HTML.
1612          *
1613          * @param $text String
1614          * @param $linestart Boolean: is this the start of a line?
1615          * @param $interface Boolean: use interface language ($wgLang instead of
1616          *                   $wgContLang) while parsing language sensitive magic
1617          *                   words like GRAMMAR and PLURAL
1618          * @return String: HTML
1619          */
1620         public function parseInline( $text, $linestart = true, $interface = false ) {
1621                 $parsed = $this->parse( $text, $linestart, $interface );
1622
1623                 $m = array();
1624                 if ( preg_match( '/^<p>(.*)\n?<\/p>\n?/sU', $parsed, $m ) ) {
1625                         $parsed = $m[1];
1626                 }
1627
1628                 return $parsed;
1629         }
1630
1631         /**
1632          * Set the value of the "s-maxage" part of the "Cache-control" HTTP header
1633          *
1634          * @param $maxage Integer: maximum cache time on the Squid, in seconds.
1635          */
1636         public function setSquidMaxage( $maxage ) {
1637                 $this->mSquidMaxage = $maxage;
1638         }
1639
1640         /**
1641          * Use enableClientCache(false) to force it to send nocache headers
1642          *
1643          * @param $state bool
1644          *
1645          * @return bool
1646          */
1647         public function enableClientCache( $state ) {
1648                 return wfSetVar( $this->mEnableClientCache, $state );
1649         }
1650
1651         /**
1652          * Get the list of cookies that will influence on the cache
1653          *
1654          * @return Array
1655          */
1656         function getCacheVaryCookies() {
1657                 global $wgCookiePrefix, $wgCacheVaryCookies;
1658                 static $cookies;
1659                 if ( $cookies === null ) {
1660                         $cookies = array_merge(
1661                                 array(
1662                                         "{$wgCookiePrefix}Token",
1663                                         "{$wgCookiePrefix}LoggedOut",
1664                                         session_name()
1665                                 ),
1666                                 $wgCacheVaryCookies
1667                         );
1668                         wfRunHooks( 'GetCacheVaryCookies', array( $this, &$cookies ) );
1669                 }
1670                 return $cookies;
1671         }
1672
1673         /**
1674          * Check if the request has a cache-varying cookie header
1675          * If it does, it's very important that we don't allow public caching
1676          *
1677          * @return Boolean
1678          */
1679         function haveCacheVaryCookies() {
1680                 $cookieHeader = $this->getRequest()->getHeader( 'cookie' );
1681                 if ( $cookieHeader === false ) {
1682                         return false;
1683                 }
1684                 $cvCookies = $this->getCacheVaryCookies();
1685                 foreach ( $cvCookies as $cookieName ) {
1686                         # Check for a simple string match, like the way squid does it
1687                         if ( strpos( $cookieHeader, $cookieName ) !== false ) {
1688                                 wfDebug( __METHOD__ . ": found $cookieName\n" );
1689                                 return true;
1690                         }
1691                 }
1692                 wfDebug( __METHOD__ . ": no cache-varying cookies found\n" );
1693                 return false;
1694         }
1695
1696         /**
1697          * Add an HTTP header that will influence on the cache
1698          *
1699          * @param $header String: header name
1700          * @param $option Array|null
1701          * @todo FIXME: Document the $option parameter; it appears to be for
1702          *        X-Vary-Options but what format is acceptable?
1703          */
1704         public function addVaryHeader( $header, $option = null ) {
1705                 if ( !array_key_exists( $header, $this->mVaryHeader ) ) {
1706                         $this->mVaryHeader[$header] = (array)$option;
1707                 } elseif( is_array( $option ) ) {
1708                         if( is_array( $this->mVaryHeader[$header] ) ) {
1709                                 $this->mVaryHeader[$header] = array_merge( $this->mVaryHeader[$header], $option );
1710                         } else {
1711                                 $this->mVaryHeader[$header] = $option;
1712                         }
1713                 }
1714                 $this->mVaryHeader[$header] = array_unique( (array)$this->mVaryHeader[$header] );
1715         }
1716
1717         /**
1718          * Return a Vary: header on which to vary caches. Based on the keys of $mVaryHeader,
1719          * such as Accept-Encoding or Cookie
1720          *
1721          * @return String
1722          */
1723         public function getVaryHeader() {
1724                 return 'Vary: ' . join( ', ', array_keys( $this->mVaryHeader ) );
1725         }
1726
1727         /**
1728          * Get a complete X-Vary-Options header
1729          *
1730          * @return String
1731          */
1732         public function getXVO() {
1733                 $cvCookies = $this->getCacheVaryCookies();
1734
1735                 $cookiesOption = array();
1736                 foreach ( $cvCookies as $cookieName ) {
1737                         $cookiesOption[] = 'string-contains=' . $cookieName;
1738                 }
1739                 $this->addVaryHeader( 'Cookie', $cookiesOption );
1740
1741                 $headers = array();
1742                 foreach( $this->mVaryHeader as $header => $option ) {
1743                         $newheader = $header;
1744                         if ( is_array( $option ) && count( $option ) > 0 ) {
1745                                 $newheader .= ';' . implode( ';', $option );
1746                         }
1747                         $headers[] = $newheader;
1748                 }
1749                 $xvo = 'X-Vary-Options: ' . implode( ',', $headers );
1750
1751                 return $xvo;
1752         }
1753
1754         /**
1755          * bug 21672: Add Accept-Language to Vary and XVO headers
1756          * if there's no 'variant' parameter existed in GET.
1757          *
1758          * For example:
1759          *   /w/index.php?title=Main_page should always be served; but
1760          *   /w/index.php?title=Main_page&variant=zh-cn should never be served.
1761          */
1762         function addAcceptLanguage() {
1763                 $lang = $this->getTitle()->getPageLanguage();
1764                 if( !$this->getRequest()->getCheck( 'variant' ) && $lang->hasVariants() ) {
1765                         $variants = $lang->getVariants();
1766                         $aloption = array();
1767                         foreach ( $variants as $variant ) {
1768                                 if( $variant === $lang->getCode() ) {
1769                                         continue;
1770                                 } else {
1771                                         $aloption[] = 'string-contains=' . $variant;
1772
1773                                         // IE and some other browsers use BCP 47 standards in
1774                                         // their Accept-Language header, like "zh-CN" or "zh-Hant".
1775                                         // We should handle these too.
1776                                         $variantBCP47 = wfBCP47( $variant );
1777                                         if ( $variantBCP47 !== $variant ) {
1778                                                 $aloption[] = 'string-contains=' . $variantBCP47;
1779                                         }
1780                                 }
1781                         }
1782                         $this->addVaryHeader( 'Accept-Language', $aloption );
1783                 }
1784         }
1785
1786         /**
1787          * Set a flag which will cause an X-Frame-Options header appropriate for
1788          * edit pages to be sent. The header value is controlled by
1789          * $wgEditPageFrameOptions.
1790          *
1791          * This is the default for special pages. If you display a CSRF-protected
1792          * form on an ordinary view page, then you need to call this function.
1793          *
1794          * @param $enable bool
1795          */
1796         public function preventClickjacking( $enable = true ) {
1797                 $this->mPreventClickjacking = $enable;
1798         }
1799
1800         /**
1801          * Turn off frame-breaking. Alias for $this->preventClickjacking(false).
1802          * This can be called from pages which do not contain any CSRF-protected
1803          * HTML form.
1804          */
1805         public function allowClickjacking() {
1806                 $this->mPreventClickjacking = false;
1807         }
1808
1809         /**
1810          * Get the X-Frame-Options header value (without the name part), or false
1811          * if there isn't one. This is used by Skin to determine whether to enable
1812          * JavaScript frame-breaking, for clients that don't support X-Frame-Options.
1813          *
1814          * @return string
1815          */
1816         public function getFrameOptions() {
1817                 global $wgBreakFrames, $wgEditPageFrameOptions;
1818                 if ( $wgBreakFrames ) {
1819                         return 'DENY';
1820                 } elseif ( $this->mPreventClickjacking && $wgEditPageFrameOptions ) {
1821                         return $wgEditPageFrameOptions;
1822                 }
1823                 return false;
1824         }
1825
1826         /**
1827          * Send cache control HTTP headers
1828          */
1829         public function sendCacheControl() {
1830                 global $wgUseSquid, $wgUseESI, $wgUseETag, $wgSquidMaxage, $wgUseXVO;
1831
1832                 $response = $this->getRequest()->response();
1833                 if ( $wgUseETag && $this->mETag ) {
1834                         $response->header( "ETag: $this->mETag" );
1835                 }
1836
1837                 $this->addVaryHeader( 'Cookie' );
1838                 $this->addAcceptLanguage();
1839
1840                 # don't serve compressed data to clients who can't handle it
1841                 # maintain different caches for logged-in users and non-logged in ones
1842                 $response->header( $this->getVaryHeader() );
1843
1844                 if ( $wgUseXVO ) {
1845                         # Add an X-Vary-Options header for Squid with Wikimedia patches
1846                         $response->header( $this->getXVO() );
1847                 }
1848
1849                 if( $this->mEnableClientCache ) {
1850                         if(
1851                                 $wgUseSquid && session_id() == '' && !$this->isPrintable() &&
1852                                 $this->mSquidMaxage != 0 && !$this->haveCacheVaryCookies()
1853                         )
1854                         {
1855                                 if ( $wgUseESI ) {
1856                                         # We'll purge the proxy cache explicitly, but require end user agents
1857                                         # to revalidate against the proxy on each visit.
1858                                         # Surrogate-Control controls our Squid, Cache-Control downstream caches
1859                                         wfDebug( __METHOD__ . ": proxy caching with ESI; {$this->mLastModified} **\n", false );
1860                                         # start with a shorter timeout for initial testing
1861                                         # header( 'Surrogate-Control: max-age=2678400+2678400, content="ESI/1.0"');
1862                                         $response->header( 'Surrogate-Control: max-age='.$wgSquidMaxage.'+'.$this->mSquidMaxage.', content="ESI/1.0"');
1863                                         $response->header( 'Cache-Control: s-maxage=0, must-revalidate, max-age=0' );
1864                                 } else {
1865                                         # We'll purge the proxy cache for anons explicitly, but require end user agents
1866                                         # to revalidate against the proxy on each visit.
1867                                         # IMPORTANT! The Squid needs to replace the Cache-Control header with
1868                                         # Cache-Control: s-maxage=0, must-revalidate, max-age=0
1869                                         wfDebug( __METHOD__ . ": local proxy caching; {$this->mLastModified} **\n", false );
1870                                         # start with a shorter timeout for initial testing
1871                                         # header( "Cache-Control: s-maxage=2678400, must-revalidate, max-age=0" );
1872                                         $response->header( 'Cache-Control: s-maxage='.$this->mSquidMaxage.', must-revalidate, max-age=0' );
1873                                 }
1874                         } else {
1875                                 # We do want clients to cache if they can, but they *must* check for updates
1876                                 # on revisiting the page.
1877                                 wfDebug( __METHOD__ . ": private caching; {$this->mLastModified} **\n", false );
1878                                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1879                                 $response->header( "Cache-Control: private, must-revalidate, max-age=0" );
1880                         }
1881                         if($this->mLastModified) {
1882                                 $response->header( "Last-Modified: {$this->mLastModified}" );
1883                         }
1884                 } else {
1885                         wfDebug( __METHOD__ . ": no caching **\n", false );
1886
1887                         # In general, the absence of a last modified header should be enough to prevent
1888                         # the client from using its cache. We send a few other things just to make sure.
1889                         $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1890                         $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
1891                         $response->header( 'Pragma: no-cache' );
1892                 }
1893         }
1894
1895         /**
1896          * Get the message associed with the HTTP response code $code
1897          *
1898          * @param $code Integer: status code
1899          * @return String or null: message or null if $code is not in the list of
1900          *         messages
1901          *
1902          * @deprecated since 1.18 Use HttpStatus::getMessage() instead.
1903          */
1904         public static function getStatusMessage( $code ) {
1905                 wfDeprecated( __METHOD__, '1.18' );
1906                 return HttpStatus::getMessage( $code );
1907         }
1908
1909         /**
1910          * Finally, all the text has been munged and accumulated into
1911          * the object, let's actually output it:
1912          */
1913         public function output() {
1914                 global $wgLanguageCode, $wgDebugRedirects, $wgMimeType, $wgVaryOnXFP;
1915
1916                 if( $this->mDoNothing ) {
1917                         return;
1918                 }
1919
1920                 wfProfileIn( __METHOD__ );
1921
1922                 $response = $this->getRequest()->response();
1923
1924                 if ( $this->mRedirect != '' ) {
1925                         # Standards require redirect URLs to be absolute
1926                         $this->mRedirect = wfExpandUrl( $this->mRedirect, PROTO_CURRENT );
1927
1928                         $redirect = $this->mRedirect;
1929                         $code = $this->mRedirectCode;
1930
1931                         if( wfRunHooks( "BeforePageRedirect", array( $this, &$redirect, &$code ) ) ) {
1932                                 if( $code == '301' || $code == '303' ) {
1933                                         if( !$wgDebugRedirects ) {
1934                                                 $message = HttpStatus::getMessage( $code );
1935                                                 $response->header( "HTTP/1.1 $code $message" );
1936                                         }
1937                                         $this->mLastModified = wfTimestamp( TS_RFC2822 );
1938                                 }
1939                                 if ( $wgVaryOnXFP ) {
1940                                         $this->addVaryHeader( 'X-Forwarded-Proto' );
1941                                 }
1942                                 $this->sendCacheControl();
1943
1944                                 $response->header( "Content-Type: text/html; charset=utf-8" );
1945                                 if( $wgDebugRedirects ) {
1946                                         $url = htmlspecialchars( $redirect );
1947                                         print "<html>\n<head>\n<title>Redirect</title>\n</head>\n<body>\n";
1948                                         print "<p>Location: <a href=\"$url\">$url</a></p>\n";
1949                                         print "</body>\n</html>\n";
1950                                 } else {
1951                                         $response->header( 'Location: ' . $redirect );
1952                                 }
1953                         }
1954
1955                         wfProfileOut( __METHOD__ );
1956                         return;
1957                 } elseif ( $this->mStatusCode ) {
1958                         $message = HttpStatus::getMessage( $this->mStatusCode );
1959                         if ( $message ) {
1960                                 $response->header( 'HTTP/1.1 ' . $this->mStatusCode . ' ' . $message );
1961                         }
1962                 }
1963
1964                 # Buffer output; final headers may depend on later processing
1965                 ob_start();
1966
1967                 $response->header( "Content-type: $wgMimeType; charset=UTF-8" );
1968                 $response->header( 'Content-language: ' . $wgLanguageCode );
1969
1970                 // Prevent framing, if requested
1971                 $frameOptions = $this->getFrameOptions();
1972                 if ( $frameOptions ) {
1973                         $response->header( "X-Frame-Options: $frameOptions" );
1974                 }
1975
1976                 if ( $this->mArticleBodyOnly ) {
1977                         $this->out( $this->mBodytext );
1978                 } else {
1979                         $this->addDefaultModules();
1980
1981                         $sk = $this->getSkin();
1982
1983                         // Hook that allows last minute changes to the output page, e.g.
1984                         // adding of CSS or Javascript by extensions.
1985                         wfRunHooks( 'BeforePageDisplay', array( &$this, &$sk ) );
1986
1987                         wfProfileIn( 'Output-skin' );
1988                         $sk->outputPage();
1989                         wfProfileOut( 'Output-skin' );
1990                 }
1991
1992                 // This hook allows last minute changes to final overall output by modifying output buffer
1993                 wfRunHooks( 'AfterFinalPageOutput', array( $this ) );
1994
1995                 $this->sendCacheControl();
1996
1997                 ob_end_flush();
1998
1999                 wfProfileOut( __METHOD__ );
2000         }
2001
2002         /**
2003          * Actually output something with print().
2004          *
2005          * @param $ins String: the string to output
2006          */
2007         public function out( $ins ) {
2008                 print $ins;
2009         }
2010
2011         /**
2012          * Produce a "user is blocked" page.
2013          * @deprecated since 1.18
2014          */
2015         function blockedPage() {
2016                 throw new UserBlockedError( $this->getUser()->mBlock );
2017         }
2018
2019         /**
2020          * Prepare this object to display an error page; disable caching and
2021          * indexing, clear the current text and redirect, set the page's title
2022          * and optionally an custom HTML title (content of the "<title>" tag).
2023          *
2024          * @param $pageTitle String|Message will be passed directly to setPageTitle()
2025          * @param $htmlTitle String|Message will be passed directly to setHTMLTitle();
2026          *                   optional, if not passed the "<title>" attribute will be
2027          *                   based on $pageTitle
2028          */
2029         public function prepareErrorPage( $pageTitle, $htmlTitle = false ) {
2030                 $this->setPageTitle( $pageTitle );
2031                 if ( $htmlTitle !== false ) {
2032                         $this->setHTMLTitle( $htmlTitle );
2033                 }
2034                 $this->setRobotPolicy( 'noindex,nofollow' );
2035                 $this->setArticleRelated( false );
2036                 $this->enableClientCache( false );
2037                 $this->mRedirect = '';
2038                 $this->clearSubtitle();
2039                 $this->clearHTML();
2040         }
2041
2042         /**
2043          * Output a standard error page
2044          *
2045          * showErrorPage( 'titlemsg', 'pagetextmsg', array( 'param1', 'param2' ) );
2046          * showErrorPage( 'titlemsg', $messageObject );
2047          * showErrorPage( $titleMessageObj, $messageObject );
2048          *
2049          * @param $title Mixed: message key (string) for page title, or a Message object
2050          * @param $msg Mixed: message key (string) for page text, or a Message object
2051          * @param $params Array: message parameters; ignored if $msg is a Message object
2052          */
2053         public function showErrorPage( $title, $msg, $params = array() ) {
2054                 if( !$title instanceof Message ) {
2055                         $title = $this->msg( $title );
2056                 }
2057
2058                 $this->prepareErrorPage( $title );
2059
2060                 if ( $msg instanceof Message ){
2061                         $this->addHTML( $msg->parseAsBlock() );
2062                 } else {
2063                         $this->addWikiMsgArray( $msg, $params );
2064                 }
2065
2066                 $this->returnToMain();
2067         }
2068
2069         /**
2070          * Output a standard permission error page
2071          *
2072          * @param $errors Array: error message keys
2073          * @param $action String: action that was denied or null if unknown
2074          */
2075         public function showPermissionsErrorPage( $errors, $action = null ) {
2076                 // For some action (read, edit, create and upload), display a "login to do this action"
2077                 // error if all of the following conditions are met:
2078                 // 1. the user is not logged in
2079                 // 2. the only error is insufficient permissions (i.e. no block or something else)
2080                 // 3. the error can be avoided simply by logging in
2081                 if ( in_array( $action, array( 'read', 'edit', 'createpage', 'createtalk', 'upload' ) )
2082                         && $this->getUser()->isAnon() && count( $errors ) == 1 && isset( $errors[0][0] )
2083                         && ( $errors[0][0] == 'badaccess-groups' || $errors[0][0] == 'badaccess-group0' )
2084                         && ( User::groupHasPermission( 'user', $action )
2085                         || User::groupHasPermission( 'autoconfirmed', $action ) )
2086                 ) {
2087                         $displayReturnto = null;
2088
2089                         # Due to bug 32276, if a user does not have read permissions,
2090                         # $this->getTitle() will just give Special:Badtitle, which is
2091                         # not especially useful as a returnto parameter. Use the title
2092                         # from the request instead, if there was one.
2093                         $request = $this->getRequest();
2094                         $returnto = Title::newFromURL( $request->getVal( 'title', '' ) );
2095                         if ( $action == 'edit' ) {
2096                                 $msg = 'whitelistedittext';
2097                                 $displayReturnto = $returnto;
2098                         } elseif ( $action == 'createpage' || $action == 'createtalk' ) {
2099                                 $msg = 'nocreatetext';
2100                         } elseif ( $action == 'upload' ) {
2101                                 $msg = 'uploadnologintext';
2102                         } else { # Read
2103                                 $msg = 'loginreqpagetext';
2104                                 $displayReturnto = Title::newMainPage();
2105                         }
2106
2107                         $query = array();
2108
2109                         if ( $returnto ) {
2110                                 $query['returnto'] = $returnto->getPrefixedText();
2111
2112                                 if ( !$request->wasPosted() ) {
2113                                         $returntoquery = $request->getValues();
2114                                         unset( $returntoquery['title'] );
2115                                         unset( $returntoquery['returnto'] );
2116                                         unset( $returntoquery['returntoquery'] );
2117                                         $query['returntoquery'] = wfArrayToCGI( $returntoquery );
2118                                 }
2119                         }
2120                         $loginLink = Linker::linkKnown(
2121                                 SpecialPage::getTitleFor( 'Userlogin' ),
2122                                 $this->msg( 'loginreqlink' )->escaped(),
2123                                 array(),
2124                                 $query
2125                         );
2126
2127                         $this->prepareErrorPage( $this->msg( 'loginreqtitle' ) );
2128                         $this->addHTML( $this->msg( $msg )->rawParams( $loginLink )->parse() );
2129
2130                         # Don't return to a page the user can't read otherwise
2131                         # we'll end up in a pointless loop
2132                         if ( $displayReturnto && $displayReturnto->userCan( 'read', $this->getUser() ) ) {
2133                                 $this->returnToMain( null, $displayReturnto );
2134                         }
2135                 } else {
2136                         $this->prepareErrorPage( $this->msg( 'permissionserrors' ) );
2137                         $this->addWikiText( $this->formatPermissionsErrorMessage( $errors, $action ) );
2138                 }
2139         }
2140
2141         /**
2142          * Display an error page indicating that a given version of MediaWiki is
2143          * required to use it
2144          *
2145          * @param $version Mixed: the version of MediaWiki needed to use the page
2146          */
2147         public function versionRequired( $version ) {
2148                 $this->prepareErrorPage( $this->msg( 'versionrequired', $version ) );
2149
2150                 $this->addWikiMsg( 'versionrequiredtext', $version );
2151                 $this->returnToMain();
2152         }
2153
2154         /**
2155          * Display an error page noting that a given permission bit is required.
2156          * @deprecated since 1.18, just throw the exception directly
2157          * @param $permission String: key required
2158          * @throws PermissionsError
2159          */
2160         public function permissionRequired( $permission ) {
2161                 throw new PermissionsError( $permission );
2162         }
2163
2164         /**
2165          * Produce the stock "please login to use the wiki" page
2166          *
2167          * @deprecated in 1.19; throw the exception directly
2168          */
2169         public function loginToUse() {
2170                 throw new PermissionsError( 'read' );
2171         }
2172
2173         /**
2174          * Format a list of error messages
2175          *
2176          * @param $errors Array of arrays returned by Title::getUserPermissionsErrors
2177          * @param $action String: action that was denied or null if unknown
2178          * @return String: the wikitext error-messages, formatted into a list.
2179          */
2180         public function formatPermissionsErrorMessage( $errors, $action = null ) {
2181                 if ( $action == null ) {
2182                         $text = $this->msg( 'permissionserrorstext', count( $errors ) )->plain() . "\n\n";
2183                 } else {
2184                         $action_desc = $this->msg( "action-$action" )->plain();
2185                         $text = $this->msg(
2186                                 'permissionserrorstext-withaction',
2187                                 count( $errors ),
2188                                 $action_desc
2189                         )->plain() . "\n\n";
2190                 }
2191
2192                 if ( count( $errors ) > 1 ) {
2193                         $text .= '<ul class="permissions-errors">' . "\n";
2194
2195                         foreach( $errors as $error ) {
2196                                 $text .= '<li>';
2197                                 $text .= call_user_func_array( array( $this, 'msg' ), $error )->plain();
2198                                 $text .= "</li>\n";
2199                         }
2200                         $text .= '</ul>';
2201                 } else {
2202                         $text .= "<div class=\"permissions-errors\">\n" .
2203                                         call_user_func_array( array( $this, 'msg' ), reset( $errors ) )->plain() .
2204                                         "\n</div>";
2205                 }
2206
2207                 return $text;
2208         }
2209
2210         /**
2211          * Display a page stating that the Wiki is in read-only mode,
2212          * and optionally show the source of the page that the user
2213          * was trying to edit.  Should only be called (for this
2214          * purpose) after wfReadOnly() has returned true.
2215          *
2216          * For historical reasons, this function is _also_ used to
2217          * show the error message when a user tries to edit a page
2218          * they are not allowed to edit.  (Unless it's because they're
2219          * blocked, then we show blockedPage() instead.)  In this
2220          * case, the second parameter should be set to true and a list
2221          * of reasons supplied as the third parameter.
2222          *
2223          * @todo Needs to be split into multiple functions.
2224          *
2225          * @param $source    String: source code to show (or null).
2226          * @param $protected Boolean: is this a permissions error?
2227          * @param $reasons   Array: list of reasons for this error, as returned by Title::getUserPermissionsErrors().
2228          * @param $action    String: action that was denied or null if unknown
2229          * @throws ReadOnlyError
2230          */
2231         public function readOnlyPage( $source = null, $protected = false, $reasons = array(), $action = null ) {
2232                 $this->setRobotPolicy( 'noindex,nofollow' );
2233                 $this->setArticleRelated( false );
2234
2235                 // If no reason is given, just supply a default "I can't let you do
2236                 // that, Dave" message.  Should only occur if called by legacy code.
2237                 if ( $protected && empty( $reasons ) ) {
2238                         $reasons[] = array( 'badaccess-group0' );
2239                 }
2240
2241                 if ( !empty( $reasons ) ) {
2242                         // Permissions error
2243                         if( $source ) {
2244                                 $this->setPageTitle( $this->msg( 'viewsource-title', $this->getTitle()->getPrefixedText() ) );
2245                                 $this->addBacklinkSubtitle( $this->getTitle() );
2246                         } else {
2247                                 $this->setPageTitle( $this->msg( 'badaccess' ) );
2248                         }
2249                         $this->addWikiText( $this->formatPermissionsErrorMessage( $reasons, $action ) );
2250                 } else {
2251                         // Wiki is read only
2252                         throw new ReadOnlyError;
2253                 }
2254
2255                 // Show source, if supplied
2256                 if( is_string( $source ) ) {
2257                         $this->addWikiMsg( 'viewsourcetext' );
2258
2259                         $pageLang = $this->getTitle()->getPageLanguage();
2260                         $params = array(
2261                                 'id'   => 'wpTextbox1',
2262                                 'name' => 'wpTextbox1',
2263                                 'cols' => $this->getUser()->getOption( 'cols' ),
2264                                 'rows' => $this->getUser()->getOption( 'rows' ),
2265                                 'readonly' => 'readonly',
2266                                 'lang' => $pageLang->getHtmlCode(),
2267                                 'dir' => $pageLang->getDir(),
2268                         );
2269                         $this->addHTML( Html::element( 'textarea', $params, $source ) );
2270
2271                         // Show templates used by this article
2272                         $templates = Linker::formatTemplates( $this->getTitle()->getTemplateLinksFrom() );
2273                         $this->addHTML( "<div class='templatesUsed'>
2274 $templates
2275 </div>
2276 " );
2277                 }
2278
2279                 # If the title doesn't exist, it's fairly pointless to print a return
2280                 # link to it.  After all, you just tried editing it and couldn't, so
2281                 # what's there to do there?
2282                 if( $this->getTitle()->exists() ) {
2283                         $this->returnToMain( null, $this->getTitle() );
2284                 }
2285         }
2286
2287         /**
2288          * Turn off regular page output and return an error reponse
2289          * for when rate limiting has triggered.
2290          */
2291         public function rateLimited() {
2292                 throw new ThrottledError;
2293         }
2294
2295         /**
2296          * Show a warning about slave lag
2297          *
2298          * If the lag is higher than $wgSlaveLagCritical seconds,
2299          * then the warning is a bit more obvious. If the lag is
2300          * lower than $wgSlaveLagWarning, then no warning is shown.
2301          *
2302          * @param $lag Integer: slave lag
2303          */
2304         public function showLagWarning( $lag ) {
2305                 global $wgSlaveLagWarning, $wgSlaveLagCritical;
2306                 if( $lag >= $wgSlaveLagWarning ) {
2307                         $message = $lag < $wgSlaveLagCritical
2308                                 ? 'lag-warn-normal'
2309                                 : 'lag-warn-high';
2310                         $wrap = Html::rawElement( 'div', array( 'class' => "mw-{$message}" ), "\n$1\n" );
2311                         $this->wrapWikiMsg( "$wrap\n", array( $message, $this->getLanguage()->formatNum( $lag ) ) );
2312                 }
2313         }
2314
2315         public function showFatalError( $message ) {
2316                 $this->prepareErrorPage( $this->msg( 'internalerror' ) );
2317
2318                 $this->addHTML( $message );
2319         }
2320
2321         public function showUnexpectedValueError( $name, $val ) {
2322                 $this->showFatalError( $this->msg( 'unexpected', $name, $val )->text() );
2323         }
2324
2325         public function showFileCopyError( $old, $new ) {
2326                 $this->showFatalError( $this->msg( 'filecopyerror', $old, $new )->text() );
2327         }
2328
2329         public function showFileRenameError( $old, $new ) {
2330                 $this->showFatalError( $this->msg( 'filerenameerror', $old, $new )->text() );
2331         }
2332
2333         public function showFileDeleteError( $name ) {
2334                 $this->showFatalError( $this->msg( 'filedeleteerror', $name )->text() );
2335         }
2336
2337         public function showFileNotFoundError( $name ) {
2338                 $this->showFatalError( $this->msg( 'filenotfound', $name )->text() );
2339         }
2340
2341         /**
2342          * Add a "return to" link pointing to a specified title
2343          *
2344          * @param $title Title to link
2345          * @param $query Array query string parameters
2346          * @param $text String text of the link (input is not escaped)
2347          * @param $options Options array to pass to Linker
2348          */
2349         public function addReturnTo( $title, $query = array(), $text = null, $options = array() ) {
2350                 if( in_array( 'http', $options ) ) {
2351                         $proto = PROTO_HTTP;
2352                 } elseif( in_array( 'https', $options ) ) {
2353                         $proto = PROTO_HTTPS;
2354                 } else {
2355                         $proto = PROTO_RELATIVE;
2356                 }
2357
2358                 $this->addLink( array( 'rel' => 'next', 'href' => $title->getFullURL( '', false, $proto ) ) );
2359                 $link = $this->msg( 'returnto' )->rawParams(
2360                         Linker::link( $title, $text, array(), $query, $options ) )->escaped();
2361                 $this->addHTML( "<p id=\"mw-returnto\">{$link}</p>\n" );
2362         }
2363
2364         /**
2365          * Add a "return to" link pointing to a specified title,
2366          * or the title indicated in the request, or else the main page
2367          *
2368          * @param $unused
2369          * @param $returnto Title or String to return to
2370          * @param $returntoquery String: query string for the return to link
2371          */
2372         public function returnToMain( $unused = null, $returnto = null, $returntoquery = null ) {
2373                 if ( $returnto == null ) {
2374                         $returnto = $this->getRequest()->getText( 'returnto' );
2375                 }
2376
2377                 if ( $returntoquery == null ) {
2378                         $returntoquery = $this->getRequest()->getText( 'returntoquery' );
2379                 }
2380
2381                 if ( $returnto === '' ) {
2382                         $returnto = Title::newMainPage();
2383                 }
2384
2385                 if ( is_object( $returnto ) ) {
2386                         $titleObj = $returnto;
2387                 } else {
2388                         $titleObj = Title::newFromText( $returnto );
2389                 }
2390                 if ( !is_object( $titleObj ) ) {
2391                         $titleObj = Title::newMainPage();
2392                 }
2393
2394                 $this->addReturnTo( $titleObj, wfCgiToArray( $returntoquery ) );
2395         }
2396
2397         /**
2398          * @param $sk Skin The given Skin
2399          * @param $includeStyle Boolean: unused
2400          * @return String: The doctype, opening "<html>", and head element.
2401          */
2402         public function headElement( Skin $sk, $includeStyle = true ) {
2403                 global $wgContLang;
2404
2405                 $userdir = $this->getLanguage()->getDir();
2406                 $sitedir = $wgContLang->getDir();
2407
2408                 if ( $sk->commonPrintStylesheet() ) {
2409                         $this->addModuleStyles( 'mediawiki.legacy.wikiprintable' );
2410                 }
2411
2412                 $ret = Html::htmlHeader( array( 'lang' => $this->getLanguage()->getHtmlCode(), 'dir' => $userdir, 'class' => 'client-nojs' ) );
2413
2414                 if ( $this->getHTMLTitle() == '' ) {
2415                         $this->setHTMLTitle( $this->msg( 'pagetitle', $this->getPageTitle() ) );
2416                 }
2417
2418                 $openHead = Html::openElement( 'head' );
2419                 if ( $openHead ) {
2420                         # Don't bother with the newline if $head == ''
2421                         $ret .= "$openHead\n";
2422                 }
2423
2424                 $ret .= Html::element( 'title', null, $this->getHTMLTitle() ) . "\n";
2425
2426                 $ret .= implode( "\n", array(
2427                         $this->getHeadLinks( null, true ),
2428                         $this->buildCssLinks(),
2429                         $this->getHeadScripts(),
2430                         $this->getHeadItems()
2431                 ) );
2432
2433                 $closeHead = Html::closeElement( 'head' );
2434                 if ( $closeHead ) {
2435                         $ret .= "$closeHead\n";
2436                 }
2437
2438                 $bodyAttrs = array();
2439
2440                 # Classes for LTR/RTL directionality support
2441                 $bodyAttrs['class'] = "mediawiki $userdir sitedir-$sitedir";
2442
2443                 if ( $this->getLanguage()->capitalizeAllNouns() ) {
2444                         # A <body> class is probably not the best way to do this . . .
2445                         $bodyAttrs['class'] .= ' capitalize-all-nouns';
2446                 }
2447                 $bodyAttrs['class'] .= ' ' . $sk->getPageClasses( $this->getTitle() );
2448                 $bodyAttrs['class'] .= ' skin-' . Sanitizer::escapeClass( $sk->getSkinName() );
2449                 $bodyAttrs['class'] .= ' action-' . Sanitizer::escapeClass( Action::getActionName( $this->getContext() ) );
2450
2451                 $sk->addToBodyAttributes( $this, $bodyAttrs ); // Allow skins to add body attributes they need
2452                 wfRunHooks( 'OutputPageBodyAttributes', array( $this, $sk, &$bodyAttrs ) );
2453
2454                 $ret .= Html::openElement( 'body', $bodyAttrs ) . "\n";
2455
2456                 return $ret;
2457         }
2458
2459         /**
2460          * Add the default ResourceLoader modules to this object
2461          */
2462         private function addDefaultModules() {
2463                 global $wgIncludeLegacyJavaScript, $wgPreloadJavaScriptMwUtil, $wgUseAjax,
2464                         $wgAjaxWatch, $wgResponsiveImages;
2465
2466                 // Add base resources
2467                 $this->addModules( array(
2468                         'mediawiki.user',
2469                         'mediawiki.page.startup',
2470                         'mediawiki.page.ready',
2471                 ) );
2472                 if ( $wgIncludeLegacyJavaScript ){
2473                         $this->addModules( 'mediawiki.legacy.wikibits' );
2474                 }
2475
2476                 if ( $wgPreloadJavaScriptMwUtil ) {
2477                         $this->addModules( 'mediawiki.util' );
2478                 }
2479
2480                 MWDebug::addModules( $this );
2481
2482                 // Add various resources if required
2483                 if ( $wgUseAjax ) {
2484                         $this->addModules( 'mediawiki.legacy.ajax' );
2485
2486                         wfRunHooks( 'AjaxAddScript', array( &$this ) );
2487
2488                         if( $wgAjaxWatch && $this->getUser()->isLoggedIn() ) {
2489                                 $this->addModules( 'mediawiki.page.watch.ajax' );
2490                         }
2491
2492                         if ( !$this->getUser()->getOption( 'disablesuggest', false ) ) {
2493                                 $this->addModules( 'mediawiki.searchSuggest' );
2494                         }
2495                 }
2496
2497                 if ( $this->getUser()->getBoolOption( 'editsectiononrightclick' ) ) {
2498                         $this->addModules( 'mediawiki.action.view.rightClickEdit' );
2499                 }
2500
2501                 # Crazy edit-on-double-click stuff
2502                 if ( $this->isArticle() && $this->getUser()->getOption( 'editondblclick' ) ) {
2503                         $this->addModules( 'mediawiki.action.view.dblClickEdit' );
2504                 }
2505
2506                 // Support for high-density display images
2507                 if ( $wgResponsiveImages ) {
2508                         $this->addModules( 'mediawiki.hidpi' );
2509                 }
2510         }
2511
2512         /**
2513          * Get a ResourceLoader object associated with this OutputPage
2514          *
2515          * @return ResourceLoader
2516          */
2517         public function getResourceLoader() {
2518                 if ( is_null( $this->mResourceLoader ) ) {
2519                         $this->mResourceLoader = new ResourceLoader();
2520                 }
2521                 return $this->mResourceLoader;
2522         }
2523
2524         /**
2525          * TODO: Document
2526          * @param $modules Array/string with the module name(s)
2527          * @param $only String ResourceLoaderModule TYPE_ class constant
2528          * @param $useESI boolean
2529          * @param $extraQuery Array with extra query parameters to add to each request. array( param => value )
2530          * @param $loadCall boolean If true, output an (asynchronous) mw.loader.load() call rather than a "<script src='...'>" tag
2531          * @return string html "<script>" and "<style>" tags
2532          */
2533         protected function makeResourceLoaderLink( $modules, $only, $useESI = false, array $extraQuery = array(), $loadCall = false ) {
2534                 global $wgResourceLoaderUseESI;
2535
2536                 $modules = (array) $modules;
2537
2538                 if ( !count( $modules ) ) {
2539                         return '';
2540                 }
2541
2542                 if ( count( $modules ) > 1 ) {
2543                         // Remove duplicate module requests
2544                         $modules = array_unique( $modules );
2545                         // Sort module names so requests are more uniform
2546                         sort( $modules );
2547
2548                         if ( ResourceLoader::inDebugMode() ) {
2549                                 // Recursively call us for every item
2550                                 $links = '';
2551                                 foreach ( $modules as $name ) {
2552                                         $links .= $this->makeResourceLoaderLink( $name, $only, $useESI );
2553                                 }
2554                                 return $links;
2555                         }
2556                 }
2557
2558                 // Create keyed-by-group list of module objects from modules list
2559                 $groups = array();
2560                 $resourceLoader = $this->getResourceLoader();
2561                 foreach ( $modules as $name ) {
2562                         $module = $resourceLoader->getModule( $name );
2563                         # Check that we're allowed to include this module on this page
2564                         if ( !$module
2565                                 || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_SCRIPTS )
2566                                         && $only == ResourceLoaderModule::TYPE_SCRIPTS )
2567                                 || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_STYLES )
2568                                         && $only == ResourceLoaderModule::TYPE_STYLES )
2569                                 )
2570                         {
2571                                 continue;
2572                         }
2573
2574                         $group = $module->getGroup();
2575                         if ( !isset( $groups[$group] ) ) {
2576                                 $groups[$group] = array();
2577                         }
2578                         $groups[$group][$name] = $module;
2579                 }
2580
2581                 $links = '';
2582                 foreach ( $groups as $group => $grpModules ) {
2583                         // Special handling for user-specific groups
2584                         $user = null;
2585                         if ( ( $group === 'user' || $group === 'private' ) && $this->getUser()->isLoggedIn() ) {
2586                                 $user = $this->getUser()->getName();
2587                         }
2588
2589                         // Create a fake request based on the one we are about to make so modules return
2590                         // correct timestamp and emptiness data
2591                         $query = ResourceLoader::makeLoaderQuery(
2592                                 array(), // modules; not determined yet
2593                                 $this->getLanguage()->getCode(),
2594                                 $this->getSkin()->getSkinName(),
2595                                 $user,
2596                                 null, // version; not determined yet
2597                                 ResourceLoader::inDebugMode(),
2598                                 $only === ResourceLoaderModule::TYPE_COMBINED ? null : $only,
2599                                 $this->isPrintable(),
2600                                 $this->getRequest()->getBool( 'handheld' ),
2601                                 $extraQuery
2602                         );
2603                         $context = new ResourceLoaderContext( $resourceLoader, new FauxRequest( $query ) );
2604                         // Extract modules that know they're empty
2605                         $emptyModules = array ();
2606                         foreach ( $grpModules as $key => $module ) {
2607                                 if ( $module->isKnownEmpty( $context ) ) {
2608                                         $emptyModules[$key] = 'ready';
2609                                         unset( $grpModules[$key] );
2610                                 }
2611                         }
2612                         // Inline empty modules: since they're empty, just mark them as 'ready'
2613                         if ( count( $emptyModules ) > 0 && $only !== ResourceLoaderModule::TYPE_STYLES ) {
2614                                 // If we're only getting the styles, we don't need to do anything for empty modules.
2615                                 $links .= Html::inlineScript(
2616
2617                                                 ResourceLoader::makeLoaderConditionalScript(
2618
2619                                                                 ResourceLoader::makeLoaderStateScript( $emptyModules )
2620
2621                                                 )
2622
2623                                 ) . "\n";
2624                         }
2625
2626                         // If there are no modules left, skip this group
2627                         if ( count( $grpModules ) === 0 ) {
2628                                 continue;
2629                         }
2630
2631                         // Inline private modules. These can't be loaded through load.php for security
2632                         // reasons, see bug 34907. Note that these modules should be loaded from
2633                         // getHeadScripts() before the first loader call. Otherwise other modules can't
2634                         // properly use them as dependencies (bug 30914)
2635                         if ( $group === 'private' ) {
2636                                 if ( $only == ResourceLoaderModule::TYPE_STYLES ) {
2637                                         $links .= Html::inlineStyle(
2638                                                 $resourceLoader->makeModuleResponse( $context, $grpModules )
2639                                         );
2640                                 } else {
2641                                         $links .= Html::inlineScript(
2642                                                 ResourceLoader::makeLoaderConditionalScript(
2643                                                         $resourceLoader->makeModuleResponse( $context, $grpModules )
2644                                                 )
2645                                         );
2646                                 }
2647                                 $links .= "\n";
2648                                 continue;
2649                         }
2650                         // Special handling for the user group; because users might change their stuff
2651                         // on-wiki like user pages, or user preferences; we need to find the highest
2652                         // timestamp of these user-changable modules so we can ensure cache misses on change
2653                         // This should NOT be done for the site group (bug 27564) because anons get that too
2654                         // and we shouldn't be putting timestamps in Squid-cached HTML
2655                         $version = null;
2656                         if ( $group === 'user' ) {
2657                                 // Get the maximum timestamp
2658                                 $timestamp = 1;
2659                                 foreach ( $grpModules as $module ) {
2660                                         $timestamp = max( $timestamp, $module->getModifiedTime( $context ) );
2661                                 }
2662                                 // Add a version parameter so cache will break when things change
2663                                 $version = wfTimestamp( TS_ISO_8601_BASIC, $timestamp );
2664                         }
2665
2666                         $url = ResourceLoader::makeLoaderURL(
2667                                 array_keys( $grpModules ),
2668                                 $this->getLanguage()->getCode(),
2669                                 $this->getSkin()->getSkinName(),
2670                                 $user,
2671                                 $version,
2672                                 ResourceLoader::inDebugMode(),
2673                                 $only === ResourceLoaderModule::TYPE_COMBINED ? null : $only,
2674                                 $this->isPrintable(),
2675                                 $this->getRequest()->getBool( 'handheld' ),
2676                                 $extraQuery
2677                         );
2678                         if ( $useESI && $wgResourceLoaderUseESI ) {
2679                                 $esi = Xml::element( 'esi:include', array( 'src' => $url ) );
2680                                 if ( $only == ResourceLoaderModule::TYPE_STYLES ) {
2681                                         $link = Html::inlineStyle( $esi );
2682                                 } else {
2683                                         $link = Html::inlineScript( $esi );
2684                                 }
2685                         } else {
2686                                 // Automatically select style/script elements
2687                                 if ( $only === ResourceLoaderModule::TYPE_STYLES ) {
2688                                         $link = Html::linkedStyle( $url );
2689                                 } else if ( $loadCall ) {
2690                                         $link = Html::inlineScript(
2691                                                 ResourceLoader::makeLoaderConditionalScript(
2692                                                         Xml::encodeJsCall( 'mw.loader.load', array( $url, 'text/javascript', true ) )
2693                                                 )
2694                                         );
2695                                 } else {
2696                                         $link = Html::linkedScript( $url );
2697                                 }
2698                         }
2699
2700                         if( $group == 'noscript' ){
2701                                 $links .= Html::rawElement( 'noscript', array(), $link ) . "\n";
2702                         } else {
2703                                 $links .= $link . "\n";
2704                         }
2705                 }
2706                 return $links;
2707         }
2708
2709         /**
2710          * JS stuff to put in the "<head>". This is the startup module, config
2711          * vars and modules marked with position 'top'
2712          *
2713          * @return String: HTML fragment
2714          */
2715         function getHeadScripts() {
2716                 global $wgResourceLoaderExperimentalAsyncLoading;
2717
2718                 // Startup - this will immediately load jquery and mediawiki modules
2719                 $scripts = $this->makeResourceLoaderLink( 'startup', ResourceLoaderModule::TYPE_SCRIPTS, true );
2720
2721                 // Load config before anything else
2722                 $scripts .= Html::inlineScript(
2723                         ResourceLoader::makeLoaderConditionalScript(
2724                                 ResourceLoader::makeConfigSetScript( $this->getJSVars() )
2725                         )
2726                 );
2727
2728                 // Load embeddable private modules before any loader links
2729                 // This needs to be TYPE_COMBINED so these modules are properly wrapped
2730                 // in mw.loader.implement() calls and deferred until mw.user is available
2731                 $embedScripts = array( 'user.options', 'user.tokens' );
2732                 $scripts .= $this->makeResourceLoaderLink( $embedScripts, ResourceLoaderModule::TYPE_COMBINED );
2733
2734                 // Script and Messages "only" requests marked for top inclusion
2735                 // Messages should go first
2736                 $scripts .= $this->makeResourceLoaderLink( $this->getModuleMessages( true, 'top' ), ResourceLoaderModule::TYPE_MESSAGES );
2737                 $scripts .= $this->makeResourceLoaderLink( $this->getModuleScripts( true, 'top' ), ResourceLoaderModule::TYPE_SCRIPTS );
2738
2739                 // Modules requests - let the client calculate dependencies and batch requests as it likes
2740                 // Only load modules that have marked themselves for loading at the top
2741                 $modules = $this->getModules( true, 'top' );
2742                 if ( $modules ) {
2743                         $scripts .= Html::inlineScript(
2744                                 ResourceLoader::makeLoaderConditionalScript(
2745                                         Xml::encodeJsCall( 'mw.loader.load', array( $modules ) )
2746                                 )
2747                         );
2748                 }
2749
2750                 if ( $wgResourceLoaderExperimentalAsyncLoading ) {
2751                         $scripts .= $this->getScriptsForBottomQueue( true );
2752                 }
2753
2754                 return $scripts;
2755         }
2756
2757         /**
2758          * JS stuff to put at the 'bottom', which can either be the bottom of the "<body>"
2759          * or the bottom of the "<head>" depending on $wgResourceLoaderExperimentalAsyncLoading:
2760          * modules marked with position 'bottom', legacy scripts ($this->mScripts),
2761          * user preferences, site JS and user JS
2762          *
2763          * @param $inHead boolean If true, this HTML goes into the "<head>", if false it goes into the "<body>"
2764          * @return string
2765          */
2766         function getScriptsForBottomQueue( $inHead ) {
2767                 global $wgUseSiteJs, $wgAllowUserJs;
2768
2769                 // Script and Messages "only" requests marked for bottom inclusion
2770                 // If we're in the <head>, use load() calls rather than <script src="..."> tags
2771                 // Messages should go first
2772                 $scripts = $this->makeResourceLoaderLink( $this->getModuleMessages( true, 'bottom' ),
2773                         ResourceLoaderModule::TYPE_MESSAGES, /* $useESI = */ false, /* $extraQuery = */ array(),
2774                         /* $loadCall = */ $inHead
2775                 );
2776                 $scripts .= $this->makeResourceLoaderLink( $this->getModuleScripts( true, 'bottom' ),
2777                         ResourceLoaderModule::TYPE_SCRIPTS, /* $useESI = */ false, /* $extraQuery = */ array(),
2778                         /* $loadCall = */ $inHead
2779                 );
2780
2781                 // Modules requests - let the client calculate dependencies and batch requests as it likes
2782                 // Only load modules that have marked themselves for loading at the bottom
2783                 $modules = $this->getModules( true, 'bottom' );
2784                 if ( $modules ) {
2785                         $scripts .= Html::inlineScript(
2786                                 ResourceLoader::makeLoaderConditionalScript(
2787                                         Xml::encodeJsCall( 'mw.loader.load', array( $modules, null, true ) )
2788                                 )
2789                         );
2790                 }
2791
2792                 // Legacy Scripts
2793                 $scripts .= "\n" . $this->mScripts;
2794
2795                 $defaultModules = array();
2796
2797                 // Add site JS if enabled
2798                 if ( $wgUseSiteJs ) {
2799                         $scripts .= $this->makeResourceLoaderLink( 'site', ResourceLoaderModule::TYPE_SCRIPTS,
2800                                 /* $useESI = */ false, /* $extraQuery = */ array(), /* $loadCall = */ $inHead
2801                         );
2802                         $defaultModules['site'] = 'loading';
2803                 } else {
2804                         // The wiki is configured to not allow a site module.
2805                         $defaultModules['site'] = 'missing';
2806                 }
2807
2808                 // Add user JS if enabled
2809                 if ( $wgAllowUserJs ) {
2810                         if ( $this->getUser()->isLoggedIn() ) {
2811                                 if( $this->getTitle() && $this->getTitle()->isJsSubpage() && $this->userCanPreview() ) {
2812                                         # XXX: additional security check/prompt?
2813                                         // We're on a preview of a JS subpage
2814                                         // Exclude this page from the user module in case it's in there (bug 26283)
2815                                         $scripts .= $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_SCRIPTS, false,
2816                                                 array( 'excludepage' => $this->getTitle()->getPrefixedDBkey() ), $inHead
2817                                         );
2818                                         // Load the previewed JS
2819                                         $scripts .= Html::inlineScript( "\n" . $this->getRequest()->getText( 'wpTextbox1' ) . "\n" ) . "\n";
2820                                         // FIXME: If the user is previewing, say, ./vector.js, his ./common.js will be loaded
2821                                         // asynchronously and may arrive *after* the inline script here. So the previewed code
2822                                         // may execute before ./common.js runs. Normally, ./common.js runs before ./vector.js...
2823                                 } else {
2824                                         // Include the user module normally, i.e., raw to avoid it being wrapped in a closure.
2825                                         $scripts .= $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_SCRIPTS,
2826                                                 /* $useESI = */ false, /* $extraQuery = */ array(), /* $loadCall = */ $inHead
2827                                         );
2828                                 }
2829                                 $defaultModules['user'] = 'loading';
2830                         } else {
2831                                 // Non-logged-in users have no user module. Treat it as empty and 'ready' to avoid
2832                                 // blocking default gadgets that might depend on it. Although arguably default-enabled
2833                                 // gadgets should not depend on the user module, it's harmless and less error-prone to
2834                                 // handle this case.
2835                                 $defaultModules['user'] = 'ready';
2836                         }
2837                 } else {
2838                         // User JS disabled
2839                         $defaultModules['user'] = 'missing';
2840                 }
2841
2842                 // Group JS is only enabled if site JS is enabled.
2843                 if ( $wgUseSiteJs ) {
2844                         if ( $this->getUser()->isLoggedIn() ) {
2845                                 $scripts .= $this->makeResourceLoaderLink( 'user.groups', ResourceLoaderModule::TYPE_COMBINED,
2846                                         /* $useESI = */ false, /* $extraQuery = */ array(), /* $loadCall = */ $inHead
2847                                 );
2848                                 $defaultModules['user.groups'] = 'loading';
2849                         } else {
2850                                 // Non-logged-in users have no user.groups module. Treat it as empty and 'ready' to
2851                                 // avoid blocking gadgets that might depend upon the module.
2852                                 $defaultModules['user.groups'] = 'ready';
2853                         }
2854                 } else {
2855                         // Site (and group JS) disabled
2856                         $defaultModules['user.groups'] = 'missing';
2857                 }
2858
2859                 $loaderInit = '';
2860                 if ( $inHead ) {
2861                         // We generate loader calls anyway, so no need to fix the client-side loader's state to 'loading'.
2862                         foreach ( $defaultModules as $m => $state ) {
2863                                 if ( $state == 'loading' ) {
2864                                         unset( $defaultModules[$m] );
2865                                 }
2866                         }
2867                 }
2868                 if ( count( $defaultModules ) > 0 ) {
2869                         $loaderInit = Html::inlineScript(
2870                                 ResourceLoader::makeLoaderConditionalScript(
2871                                         ResourceLoader::makeLoaderStateScript( $defaultModules )
2872                                 )
2873                         ) . "\n";
2874                 }
2875                 return $loaderInit . $scripts;
2876         }
2877
2878         /**
2879          * JS stuff to put at the bottom of the "<body>"
2880          * @return string
2881          */
2882         function getBottomScripts() {
2883                 global $wgResourceLoaderExperimentalAsyncLoading;
2884                 if ( !$wgResourceLoaderExperimentalAsyncLoading ) {
2885                         return $this->getScriptsForBottomQueue( false );
2886                 } else {
2887                         return '';
2888                 }
2889         }
2890
2891         /**
2892          * Add one or more variables to be set in mw.config in JavaScript.
2893          *
2894          * @param $keys {String|Array} Key or array of key/value pairs.
2895          * @param $value {Mixed} [optional] Value of the configuration variable.
2896          */
2897         public function addJsConfigVars( $keys, $value = null ) {
2898                 if ( is_array( $keys ) ) {
2899                         foreach ( $keys as $key => $value ) {
2900                                 $this->mJsConfigVars[$key] = $value;
2901                         }
2902                         return;
2903                 }
2904
2905                 $this->mJsConfigVars[$keys] = $value;
2906         }
2907
2908
2909         /**
2910          * Get an array containing the variables to be set in mw.config in JavaScript.
2911          *
2912          * DO NOT CALL THIS FROM OUTSIDE OF THIS CLASS OR Skin::makeGlobalVariablesScript().
2913          * This is only public until that function is removed. You have been warned.
2914          *
2915          * Do not add things here which can be evaluated in ResourceLoaderStartupScript
2916          * - in other words, page-independent/site-wide variables (without state).
2917          * You will only be adding bloat to the html page and causing page caches to
2918          * have to be purged on configuration changes.
2919          * @return array
2920          */
2921         public function getJSVars() {
2922                 global $wgContLang;
2923
2924                 $latestRevID = 0;
2925                 $pageID = 0;
2926                 $canonicalName = false; # bug 21115
2927
2928                 $title = $this->getTitle();
2929                 $ns = $title->getNamespace();
2930                 $nsname = MWNamespace::exists( $ns ) ? MWNamespace::getCanonicalName( $ns ) : $title->getNsText();
2931
2932                 // Get the relevant title so that AJAX features can use the correct page name
2933                 // when making API requests from certain special pages (bug 34972).
2934                 $relevantTitle = $this->getSkin()->getRelevantTitle();
2935
2936                 if ( $ns == NS_SPECIAL ) {
2937                         list( $canonicalName, /*...*/ ) = SpecialPageFactory::resolveAlias( $title->getDBkey() );
2938                 } elseif ( $this->canUseWikiPage() ) {
2939                         $wikiPage = $this->getWikiPage();
2940                         $latestRevID = $wikiPage->getLatest();
2941                         $pageID = $wikiPage->getId();
2942                 }
2943
2944                 $lang = $title->getPageLanguage();
2945
2946                 // Pre-process information
2947                 $separatorTransTable = $lang->separatorTransformTable();
2948                 $separatorTransTable = $separatorTransTable ? $separatorTransTable : array();
2949                 $compactSeparatorTransTable = array(
2950                         implode( "\t", array_keys( $separatorTransTable ) ),
2951                         implode( "\t", $separatorTransTable ),
2952                 );
2953                 $digitTransTable = $lang->digitTransformTable();
2954                 $digitTransTable = $digitTransTable ? $digitTransTable : array();
2955                 $compactDigitTransTable = array(
2956                         implode( "\t", array_keys( $digitTransTable ) ),
2957                         implode( "\t", $digitTransTable ),
2958                 );
2959
2960                 $vars = array(
2961                         'wgCanonicalNamespace' => $nsname,
2962                         'wgCanonicalSpecialPageName' => $canonicalName,
2963                         'wgNamespaceNumber' => $title->getNamespace(),
2964                         'wgPageName' => $title->getPrefixedDBKey(),
2965                         'wgTitle' => $title->getText(),
2966                         'wgCurRevisionId' => $latestRevID,
2967                         'wgArticleId' => $pageID,
2968                         'wgIsArticle' => $this->isArticle(),
2969                         'wgAction' => Action::getActionName( $this->getContext() ),
2970                         'wgUserName' => $this->getUser()->isAnon() ? null : $this->getUser()->getName(),
2971                         'wgUserGroups' => $this->getUser()->getEffectiveGroups(),
2972                         'wgCategories' => $this->getCategories(),
2973                         'wgBreakFrames' => $this->getFrameOptions() == 'DENY',
2974                         'wgPageContentLanguage' => $lang->getCode(),
2975                         'wgSeparatorTransformTable' => $compactSeparatorTransTable,
2976                         'wgDigitTransformTable' => $compactDigitTransTable,
2977                         'wgDefaultDateFormat' => $lang->getDefaultDateFormat(),
2978                         'wgMonthNames' => $lang->getMonthNamesArray(),
2979                         'wgMonthNamesShort' => $lang->getMonthAbbreviationsArray(),
2980                         'wgRelevantPageName' => $relevantTitle->getPrefixedDBKey(),
2981                 );
2982                 if ( $wgContLang->hasVariants() ) {
2983                         $vars['wgUserVariant'] = $wgContLang->getPreferredVariant();
2984                 }
2985                 foreach ( $title->getRestrictionTypes() as $type ) {
2986                         $vars['wgRestriction' . ucfirst( $type )] = $title->getRestrictions( $type );
2987                 }
2988                 if ( $title->isMainPage() ) {
2989                         $vars['wgIsMainPage'] = true;
2990                 }
2991                 if ( $this->mRedirectedFrom ) {
2992                         $vars['wgRedirectedFrom'] = $this->mRedirectedFrom->getPrefixedDBKey();
2993                 }
2994
2995                 // Allow extensions to add their custom variables to the mw.config map.
2996                 // Use the 'ResourceLoaderGetConfigVars' hook if the variable is not
2997                 // page-dependant but site-wide (without state).
2998                 // Alternatively, you may want to use OutputPage->addJsConfigVars() instead.
2999                 wfRunHooks( 'MakeGlobalVariablesScript', array( &$vars, $this ) );
3000
3001                 // Merge in variables from addJsConfigVars last
3002                 return array_merge( $vars, $this->mJsConfigVars );
3003         }
3004
3005         /**
3006          * To make it harder for someone to slip a user a fake
3007          * user-JavaScript or user-CSS preview, a random token
3008          * is associated with the login session. If it's not
3009          * passed back with the preview request, we won't render
3010          * the code.
3011          *
3012          * @return bool
3013          */
3014         public function userCanPreview() {
3015                 if ( $this->getRequest()->getVal( 'action' ) != 'submit'
3016                         || !$this->getRequest()->wasPosted()
3017                         || !$this->getUser()->matchEditToken(
3018                                 $this->getRequest()->getVal( 'wpEditToken' ) )
3019                 ) {
3020                         return false;
3021                 }
3022                 if ( !$this->getTitle()->isJsSubpage() && !$this->getTitle()->isCssSubpage() ) {
3023                         return false;
3024                 }
3025
3026                 return !count( $this->getTitle()->getUserPermissionsErrors( 'edit', $this->getUser() ) );
3027         }
3028
3029         /**
3030          * @param $addContentType bool: Whether "<meta>" specifying content type should be returned
3031          *
3032          * @return array in format "link name or number => 'link html'".
3033          */
3034         public function getHeadLinksArray( $addContentType = false ) {
3035                 global $wgUniversalEditButton, $wgFavicon, $wgAppleTouchIcon, $wgEnableAPI,
3036                         $wgSitename, $wgVersion, $wgHtml5, $wgMimeType,
3037                         $wgFeed, $wgOverrideSiteFeed, $wgAdvertisedFeedTypes,
3038                         $wgDisableLangConversion, $wgCanonicalLanguageLinks,
3039                         $wgRightsPage, $wgRightsUrl;
3040
3041                 $tags = array();
3042
3043                 if ( $addContentType ) {
3044                         if ( $wgHtml5 ) {
3045                                 # More succinct than <meta http-equiv=Content-Type>, has the
3046                                 # same effect
3047                                 $tags['meta-charset'] = Html::element( 'meta', array( 'charset' => 'UTF-8' ) );
3048                         } else {
3049                                 $tags['meta-content-type'] = Html::element( 'meta', array(
3050                                         'http-equiv' => 'Content-Type',
3051                                         'content' => "$wgMimeType; charset=UTF-8"
3052                                 ) );
3053                                 $tags['meta-content-style-type'] = Html::element( 'meta', array(  // bug 15835
3054                                         'http-equiv' => 'Content-Style-Type',
3055                                         'content' => 'text/css'
3056                                 ) );
3057                         }
3058                 }
3059
3060                 $tags['meta-generator'] = Html::element( 'meta', array(
3061                         'name' => 'generator',
3062                         'content' => "MediaWiki $wgVersion",
3063                 ) );
3064
3065                 $p = "{$this->mIndexPolicy},{$this->mFollowPolicy}";
3066                 if( $p !== 'index,follow' ) {
3067                         // http://www.robotstxt.org/wc/meta-user.html
3068                         // Only show if it's different from the default robots policy
3069                         $tags['meta-robots'] = Html::element( 'meta', array(
3070                                 'name' => 'robots',
3071                                 'content' => $p,
3072                         ) );
3073                 }
3074
3075                 if ( count( $this->mKeywords ) > 0 ) {
3076                         $strip = array(
3077                                 "/<.*?" . ">/" => '',
3078                                 "/_/" => ' '
3079                         );
3080                         $tags['meta-keywords'] = Html::element( 'meta', array(
3081                                 'name' => 'keywords',
3082                                 'content' =>  preg_replace(
3083                                         array_keys( $strip ),
3084                                         array_values( $strip ),
3085                                         implode( ',', $this->mKeywords )
3086                                 )
3087                         ) );
3088                 }
3089
3090                 foreach ( $this->mMetatags as $tag ) {
3091                         if ( 0 == strcasecmp( 'http:', substr( $tag[0], 0, 5 ) ) ) {
3092                                 $a = 'http-equiv';
3093                                 $tag[0] = substr( $tag[0], 5 );
3094                         } else {
3095                                 $a = 'name';
3096                         }
3097                         $tagName = "meta-{$tag[0]}";
3098                         if ( isset( $tags[$tagName] ) ) {
3099                                 $tagName .= $tag[1];
3100                         }
3101                         $tags[$tagName] = Html::element( 'meta',
3102                                 array(
3103                                         $a => $tag[0],
3104                                         'content' => $tag[1]
3105                                 )
3106                         );
3107                 }
3108
3109                 foreach ( $this->mLinktags as $tag ) {
3110                         $tags[] = Html::element( 'link', $tag );
3111                 }
3112
3113                 # Universal edit button
3114                 if ( $wgUniversalEditButton && $this->isArticleRelated() ) {
3115                         $user = $this->getUser();
3116                         if ( $this->getTitle()->quickUserCan( 'edit', $user )
3117                                 && ( $this->getTitle()->exists() || $this->getTitle()->quickUserCan( 'create', $user ) ) ) {
3118                                 // Original UniversalEditButton
3119                                 $msg = $this->msg( 'edit' )->text();
3120                                 $tags['universal-edit-button'] = Html::element( 'link', array(
3121                                         'rel' => 'alternate',
3122                                         'type' => 'application/x-wiki',
3123                                         'title' => $msg,
3124                                         'href' => $this->getTitle()->getLocalURL( 'action=edit' )
3125                                 ) );
3126                                 // Alternate edit link
3127                                 $tags['alternative-edit'] = Html::element( 'link', array(
3128                                         'rel' => 'edit',
3129                                         'title' => $msg,
3130                                         'href' => $this->getTitle()->getLocalURL( 'action=edit' )
3131                                 ) );
3132                         }
3133                 }
3134
3135                 # Generally the order of the favicon and apple-touch-icon links
3136                 # should not matter, but Konqueror (3.5.9 at least) incorrectly
3137                 # uses whichever one appears later in the HTML source. Make sure
3138                 # apple-touch-icon is specified first to avoid this.
3139                 if ( $wgAppleTouchIcon !== false ) {
3140                         $tags['apple-touch-icon'] = Html::element( 'link', array( 'rel' => 'apple-touch-icon', 'href' => $wgAppleTouchIcon ) );
3141                 }
3142
3143                 if ( $wgFavicon !== false ) {
3144                         $tags['favicon'] = Html::element( 'link', array( 'rel' => 'shortcut icon', 'href' => $wgFavicon ) );
3145                 }
3146
3147                 # OpenSearch description link
3148                 $tags['opensearch'] = Html::element( 'link', array(
3149                         'rel' => 'search',
3150                         'type' => 'application/opensearchdescription+xml',
3151                         'href' => wfScript( 'opensearch_desc' ),
3152                         'title' => $this->msg( 'opensearch-desc' )->inContentLanguage()->text(),
3153                 ) );
3154
3155                 if ( $wgEnableAPI ) {
3156                         # Real Simple Discovery link, provides auto-discovery information
3157                         # for the MediaWiki API (and potentially additional custom API
3158                         # support such as WordPress or Twitter-compatible APIs for a
3159                         # blogging extension, etc)
3160                         $tags['rsd'] = Html::element( 'link', array(
3161                                 'rel' => 'EditURI',
3162                                 'type' => 'application/rsd+xml',
3163                                 // Output a protocol-relative URL here if $wgServer is protocol-relative
3164                                 // Whether RSD accepts relative or protocol-relative URLs is completely undocumented, though
3165                                 'href' => wfExpandUrl( wfAppendQuery( wfScript( 'api' ), array( 'action' => 'rsd' ) ), PROTO_RELATIVE ),
3166                         ) );
3167                 }
3168
3169
3170                 # Language variants
3171                 if ( !$wgDisableLangConversion && $wgCanonicalLanguageLinks ) {
3172                         $lang = $this->getTitle()->getPageLanguage();
3173                         if ( $lang->hasVariants() ) {
3174
3175                                 $urlvar = $lang->getURLVariant();
3176
3177                                 if ( !$urlvar ) {
3178                                         $variants = $lang->getVariants();
3179                                         foreach ( $variants as $_v ) {
3180                                                 $tags["variant-$_v"] = Html::element( 'link', array(
3181                                                         'rel' => 'alternate',
3182                                                         'hreflang' => $_v,
3183                                                         'href' => $this->getTitle()->getLocalURL( array( 'variant' => $_v ) ) )
3184                                                 );
3185                                         }
3186                                 } else {
3187                                         $tags['canonical'] = Html::element( 'link', array(
3188                                                 'rel' => 'canonical',
3189                                                 'href' => $this->getTitle()->getCanonicalUrl()
3190                                         ) );
3191                                 }
3192                         }
3193                 }
3194
3195                 # Copyright
3196                 $copyright = '';
3197                 if ( $wgRightsPage ) {
3198                         $copy = Title::newFromText( $wgRightsPage );
3199
3200                         if ( $copy ) {
3201                                 $copyright = $copy->getLocalURL();
3202                         }
3203                 }
3204
3205                 if ( !$copyright && $wgRightsUrl ) {
3206                         $copyright = $wgRightsUrl;
3207                 }
3208
3209                 if ( $copyright ) {
3210                         $tags['copyright'] = Html::element( 'link', array(
3211                                 'rel' => 'copyright',
3212                                 'href' => $copyright )
3213                         );
3214                 }
3215
3216                 # Feeds
3217                 if ( $wgFeed ) {
3218                         foreach( $this->getSyndicationLinks() as $format => $link ) {
3219                                 # Use the page name for the title.  In principle, this could
3220                                 # lead to issues with having the same name for different feeds
3221                                 # corresponding to the same page, but we can't avoid that at
3222                                 # this low a level.
3223
3224                                 $tags[] = $this->feedLink(
3225                                         $format,
3226                                         $link,
3227                                         # Used messages: 'page-rss-feed' and 'page-atom-feed' (for an easier grep)
3228                                         $this->msg( "page-{$format}-feed", $this->getTitle()->getPrefixedText() )->text()
3229                                 );
3230                         }
3231
3232                         # Recent changes feed should appear on every page (except recentchanges,
3233                         # that would be redundant). Put it after the per-page feed to avoid
3234                         # changing existing behavior. It's still available, probably via a
3235                         # menu in your browser. Some sites might have a different feed they'd
3236                         # like to promote instead of the RC feed (maybe like a "Recent New Articles"
3237                         # or "Breaking news" one). For this, we see if $wgOverrideSiteFeed is defined.
3238                         # If so, use it instead.
3239                         if ( $wgOverrideSiteFeed ) {
3240                                 foreach ( $wgOverrideSiteFeed as $type => $feedUrl ) {
3241                                         // Note, this->feedLink escapes the url.
3242                                         $tags[] = $this->feedLink(
3243                                                 $type,
3244                                                 $feedUrl,
3245                                                 $this->msg( "site-{$type}-feed", $wgSitename )->text()
3246                                         );
3247                                 }
3248                         } elseif ( !$this->getTitle()->isSpecial( 'Recentchanges' ) ) {
3249                                 $rctitle = SpecialPage::getTitleFor( 'Recentchanges' );
3250                                 foreach ( $wgAdvertisedFeedTypes as $format ) {
3251                                         $tags[] = $this->feedLink(
3252                                                 $format,
3253                                                 $rctitle->getLocalURL( "feed={$format}" ),
3254                                                 $this->msg( "site-{$format}-feed", $wgSitename )->text() # For grep: 'site-rss-feed', 'site-atom-feed'.
3255                                         );
3256                                 }
3257                         }
3258                 }
3259                 return $tags;
3260         }
3261
3262         /**
3263          * @param $unused
3264          * @param $addContentType bool: Whether "<meta>" specifying content type should be returned
3265          *
3266          * @return string HTML tag links to be put in the header.
3267          */
3268         public function getHeadLinks( $unused = null, $addContentType = false ) {
3269                 return implode( "\n", $this->getHeadLinksArray( $addContentType ) );
3270         }
3271
3272         /**
3273          * Generate a "<link rel/>" for a feed.
3274          *
3275          * @param $type String: feed type
3276          * @param $url String: URL to the feed
3277          * @param $text String: value of the "title" attribute
3278          * @return String: HTML fragment
3279          */
3280         private function feedLink( $type, $url, $text ) {
3281                 return Html::element( 'link', array(
3282                         'rel' => 'alternate',
3283                         'type' => "application/$type+xml",
3284                         'title' => $text,
3285                         'href' => $url )
3286                 );
3287         }
3288
3289         /**
3290          * Add a local or specified stylesheet, with the given media options.
3291          * Meant primarily for internal use...
3292          *
3293          * @param $style String: URL to the file
3294          * @param $media String: to specify a media type, 'screen', 'printable', 'handheld' or any.
3295          * @param $condition String: for IE conditional comments, specifying an IE version
3296          * @param $dir String: set to 'rtl' or 'ltr' for direction-specific sheets
3297          */
3298         public function addStyle( $style, $media = '', $condition = '', $dir = '' ) {
3299                 $options = array();
3300                 // Even though we expect the media type to be lowercase, but here we
3301                 // force it to lowercase to be safe.
3302                 if( $media ) {
3303                         $options['media'] = $media;
3304                 }
3305                 if( $condition ) {
3306                         $options['condition'] = $condition;
3307                 }
3308                 if( $dir ) {
3309                         $options['dir'] = $dir;
3310                 }
3311                 $this->styles[$style] = $options;
3312         }
3313
3314         /**
3315          * Adds inline CSS styles
3316          * @param $style_css Mixed: inline CSS
3317          * @param $flip String: Set to 'flip' to flip the CSS if needed
3318          */
3319         public function addInlineStyle( $style_css, $flip = 'noflip' ) {
3320                 if( $flip === 'flip' && $this->getLanguage()->isRTL() ) {
3321                         # If wanted, and the interface is right-to-left, flip the CSS
3322                         $style_css = CSSJanus::transform( $style_css, true, false );
3323                 }
3324                 $this->mInlineStyles .= Html::inlineStyle( $style_css );
3325         }
3326
3327         /**
3328          * Build a set of "<link>" elements for the stylesheets specified in the $this->styles array.
3329          * These will be applied to various media & IE conditionals.
3330          *
3331          * @return string
3332          */
3333         public function buildCssLinks() {
3334                 global $wgUseSiteCss, $wgAllowUserCss, $wgAllowUserCssPrefs,
3335                         $wgLang, $wgContLang;
3336
3337                 $this->getSkin()->setupSkinUserCss( $this );
3338
3339                 // Add ResourceLoader styles
3340                 // Split the styles into four groups
3341                 $styles = array( 'other' => array(), 'user' => array(), 'site' => array(), 'private' => array(), 'noscript' => array() );
3342                 $otherTags = ''; // Tags to append after the normal <link> tags
3343                 $resourceLoader = $this->getResourceLoader();
3344
3345                 $moduleStyles = $this->getModuleStyles();
3346
3347                 // Per-site custom styles
3348                 if ( $wgUseSiteCss ) {
3349                         $moduleStyles[] = 'site';
3350                         $moduleStyles[] = 'noscript';
3351                         if( $this->getUser()->isLoggedIn() ){
3352                                 $moduleStyles[] = 'user.groups';
3353                         }
3354                 }
3355
3356                 // Per-user custom styles
3357                 if ( $wgAllowUserCss ) {
3358                         if ( $this->getTitle()->isCssSubpage() && $this->userCanPreview() ) {
3359                                 // We're on a preview of a CSS subpage
3360                                 // Exclude this page from the user module in case it's in there (bug 26283)
3361                                 $otherTags .= $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_STYLES, false,
3362                                         array( 'excludepage' => $this->getTitle()->getPrefixedDBkey() )
3363                                 );
3364
3365                                 // Load the previewed CSS
3366                                 // If needed, Janus it first. This is user-supplied CSS, so it's
3367                                 // assumed to be right for the content language directionality.
3368                                 $previewedCSS = $this->getRequest()->getText( 'wpTextbox1' );
3369                                 if ( $wgLang->getDir() !== $wgContLang->getDir() ) {
3370                                         $previewedCSS = CSSJanus::transform( $previewedCSS, true, false );
3371                                 }
3372                                 $otherTags .= Html::inlineStyle( $previewedCSS );
3373                         } else {
3374                                 // Load the user styles normally
3375                                 $moduleStyles[] = 'user';
3376                         }
3377                 }
3378
3379                 // Per-user preference styles
3380                 if ( $wgAllowUserCssPrefs ) {
3381                         $moduleStyles[] = 'user.cssprefs';
3382                 }
3383
3384                 foreach ( $moduleStyles as $name ) {
3385                         $module = $resourceLoader->getModule( $name );
3386                         if ( !$module ) {
3387                                 continue;
3388                         }
3389                         $group = $module->getGroup();
3390                         // Modules in groups named "other" or anything different than "user", "site" or "private"
3391                         // will be placed in the "other" group
3392                         $styles[isset( $styles[$group] ) ? $group : 'other'][] = $name;
3393                 }
3394
3395                 // We want site, private and user styles to override dynamically added styles from modules, but we want
3396                 // dynamically added styles to override statically added styles from other modules. So the order
3397                 // has to be other, dynamic, site, private, user
3398                 // Add statically added styles for other modules
3399                 $ret = $this->makeResourceLoaderLink( $styles['other'], ResourceLoaderModule::TYPE_STYLES );
3400                 // Add normal styles added through addStyle()/addInlineStyle() here
3401                 $ret .= implode( "\n", $this->buildCssLinksArray() ) . $this->mInlineStyles;
3402                 // Add marker tag to mark the place where the client-side loader should inject dynamic styles
3403                 // We use a <meta> tag with a made-up name for this because that's valid HTML
3404                 $ret .= Html::element( 'meta', array( 'name' => 'ResourceLoaderDynamicStyles', 'content' => '' ) ) . "\n";
3405
3406                 // Add site, private and user styles
3407                 // 'private' at present only contains user.options, so put that before 'user'
3408                 // Any future private modules will likely have a similar user-specific character
3409                 foreach ( array( 'site', 'noscript', 'private', 'user' ) as $group ) {
3410                         $ret .= $this->makeResourceLoaderLink( $styles[$group],
3411                                         ResourceLoaderModule::TYPE_STYLES
3412                         );
3413                 }
3414
3415                 // Add stuff in $otherTags (previewed user CSS if applicable)
3416                 $ret .= $otherTags;
3417                 return $ret;
3418         }
3419
3420         /**
3421          * @return Array
3422          */
3423         public function buildCssLinksArray() {
3424                 $links = array();
3425
3426                 // Add any extension CSS
3427                 foreach ( $this->mExtStyles as $url ) {
3428                         $this->addStyle( $url );
3429                 }
3430                 $this->mExtStyles = array();
3431
3432                 foreach( $this->styles as $file => $options ) {
3433                         $link = $this->styleLink( $file, $options );
3434                         if( $link ) {
3435                                 $links[$file] = $link;
3436                         }
3437                 }
3438                 return $links;
3439         }
3440
3441         /**
3442          * Generate \<link\> tags for stylesheets
3443          *
3444          * @param $style String: URL to the file
3445          * @param $options Array: option, can contain 'condition', 'dir', 'media'
3446          *                 keys
3447          * @return String: HTML fragment
3448          */
3449         protected function styleLink( $style, $options ) {
3450                 if( isset( $options['dir'] ) ) {
3451                         if( $this->getLanguage()->getDir() != $options['dir'] ) {
3452                                 return '';
3453                         }
3454                 }
3455
3456                 if( isset( $options['media'] ) ) {
3457                         $media = self::transformCssMedia( $options['media'] );
3458                         if( is_null( $media ) ) {
3459                                 return '';
3460                         }
3461                 } else {
3462                         $media = 'all';
3463                 }
3464
3465                 if( substr( $style, 0, 1 ) == '/' ||
3466                         substr( $style, 0, 5 ) == 'http:' ||
3467                         substr( $style, 0, 6 ) == 'https:' ) {
3468                         $url = $style;
3469                 } else {
3470                         global $wgStylePath, $wgStyleVersion;
3471                         $url = $wgStylePath . '/' . $style . '?' . $wgStyleVersion;
3472                 }
3473
3474                 $link = Html::linkedStyle( $url, $media );
3475
3476                 if( isset( $options['condition'] ) ) {
3477                         $condition = htmlspecialchars( $options['condition'] );
3478                         $link = "<!--[if $condition]>$link<![endif]-->";
3479                 }
3480                 return $link;
3481         }
3482
3483         /**
3484          * Transform "media" attribute based on request parameters
3485          *
3486          * @param $media String: current value of the "media" attribute
3487          * @return String: modified value of the "media" attribute
3488          */
3489         public static function transformCssMedia( $media ) {
3490                 global $wgRequest, $wgHandheldForIPhone;
3491
3492                 // Switch in on-screen display for media testing
3493                 $switches = array(
3494                         'printable' => 'print',
3495                         'handheld' => 'handheld',
3496                 );
3497                 foreach( $switches as $switch => $targetMedia ) {
3498                         if( $wgRequest->getBool( $switch ) ) {
3499                                 if( $media == $targetMedia ) {
3500                                         $media = '';
3501                                 } elseif( $media == 'screen' ) {
3502                                         return null;
3503                                 }
3504                         }
3505                 }
3506
3507                 // Expand longer media queries as iPhone doesn't grok 'handheld'
3508                 if( $wgHandheldForIPhone ) {
3509                         $mediaAliases = array(
3510                                 'screen' => 'screen and (min-device-width: 481px)',
3511                                 'handheld' => 'handheld, only screen and (max-device-width: 480px)',
3512                         );
3513
3514                         if( isset( $mediaAliases[$media] ) ) {
3515                                 $media = $mediaAliases[$media];
3516                         }
3517                 }
3518
3519                 return $media;
3520         }
3521
3522         /**
3523          * Add a wikitext-formatted message to the output.
3524          * This is equivalent to:
3525          *
3526          *    $wgOut->addWikiText( wfMessage( ... )->plain() )
3527          */
3528         public function addWikiMsg( /*...*/ ) {
3529                 $args = func_get_args();
3530                 $name = array_shift( $args );
3531                 $this->addWikiMsgArray( $name, $args );
3532         }
3533
3534         /**
3535          * Add a wikitext-formatted message to the output.
3536          * Like addWikiMsg() except the parameters are taken as an array
3537          * instead of a variable argument list.
3538          *
3539          * @param $name string
3540          * @param $args array
3541          */
3542         public function addWikiMsgArray( $name, $args ) {
3543                 $this->addHTML( $this->msg( $name, $args )->parseAsBlock() );
3544         }
3545
3546         /**
3547          * This function takes a number of message/argument specifications, wraps them in
3548          * some overall structure, and then parses the result and adds it to the output.
3549          *
3550          * In the $wrap, $1 is replaced with the first message, $2 with the second, and so
3551          * on. The subsequent arguments may either be strings, in which case they are the
3552          * message names, or arrays, in which case the first element is the message name,
3553          * and subsequent elements are the parameters to that message.
3554          *
3555          * Don't use this for messages that are not in users interface language.
3556          *
3557          * For example:
3558          *
3559          *    $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>", 'some-error' );
3560          *
3561          * Is equivalent to:
3562          *
3563          *    $wgOut->addWikiText( "<div class='error'>\n" . wfMessage( 'some-error' )->plain() . "\n</div>" );
3564          *
3565          * The newline after opening div is needed in some wikitext. See bug 19226.
3566          *
3567          * @param $wrap string
3568          */
3569         public function wrapWikiMsg( $wrap /*, ...*/ ) {
3570                 $msgSpecs = func_get_args();
3571                 array_shift( $msgSpecs );
3572                 $msgSpecs = array_values( $msgSpecs );
3573                 $s = $wrap;
3574                 foreach ( $msgSpecs as $n => $spec ) {
3575                         if ( is_array( $spec ) ) {
3576                                 $args = $spec;
3577                                 $name = array_shift( $args );
3578                                 if ( isset( $args['options'] ) ) {
3579                                         unset( $args['options'] );
3580                                         wfDeprecated(
3581                                                 'Adding "options" to ' . __METHOD__ . ' is no longer supported',
3582                                                 '1.20'
3583                                         );
3584                                 }
3585                         }  else {
3586                                 $args = array();
3587                                 $name = $spec;
3588                         }
3589                         $s = str_replace( '$' . ( $n + 1 ), $this->msg( $name, $args )->plain(), $s );
3590                 }
3591                 $this->addWikiText( $s );
3592         }
3593
3594         /**
3595          * Include jQuery core. Use this to avoid loading it multiple times
3596          * before we get a usable script loader.
3597          *
3598          * @param $modules Array: list of jQuery modules which should be loaded
3599          * @return Array: the list of modules which were not loaded.
3600          * @since 1.16
3601          * @deprecated since 1.17
3602          */
3603         public function includeJQuery( $modules = array() ) {
3604                 return array();
3605         }
3606
3607 }