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          * TODO: make a getter method for this
  60          */
  61         public $mDebugtext = ''; // TODO: we might want to replace it by wfDebug() wfDebugLog()
  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 contains
 120          * 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                 'Cookie' => null
 241         );
 242
 243         /**
 244          * If the current page was reached through a redirect, $mRedirectedFrom contains the Title
 245          * of the redirect.
 246          *
 247          * @var Title
 248          */
 249         private $mRedirectedFrom = null;
 250
 251         /**
 252          * Constructor for OutputPage. This should not be called directly.
 253          * Instead a new RequestContext should be created and it will implicitly create
 254          * a OutputPage tied to that context.
 255          */
 256         function __construct( IContextSource $context = null ) {
 257                 if ( $context === null ) {
 258                         # Extensions should use `new RequestContext` instead of `new OutputPage` now.
 259                         wfDeprecated( __METHOD__ );
 260                 } else {
 261                         $this->setContext( $context );
 262                 }
 263         }
 264
 265         /**
 266          * Redirect to $url rather than displaying the normal page
 267          *
 268          * @param $url String: URL
 269          * @param $responsecode String: HTTP status code
 270          */
 271         public function redirect( $url, $responsecode = '302' ) {
 272                 # Strip newlines as a paranoia check for header injection in PHP<5.1.2
 273                 $this->mRedirect = str_replace( "\n", '', $url );
 274                 $this->mRedirectCode = $responsecode;
 275         }
 276
 277         /**
 278          * Get the URL to redirect to, or an empty string if not redirect URL set
 279          *
 280          * @return String
 281          */
 282         public function getRedirect() {
 283                 return $this->mRedirect;
 284         }
 285
 286         /**
 287          * Set the HTTP status code to send with the output.
 288          *
 289          * @param $statusCode Integer
 290          */
 291         public function setStatusCode( $statusCode ) {
 292                 $this->mStatusCode = $statusCode;
 293         }
 294
 295         /**
 296          * Add a new <meta> tag
 297          * To add an http-equiv meta tag, precede the name with "http:"
 298          *
 299          * @param $name String tag name
 300          * @param $val String tag value
 301          */
 302         function addMeta( $name, $val ) {
 303                 array_push( $this->mMetatags, array( $name, $val ) );
 304         }
 305
 306         /**
 307          * Add a keyword or a list of keywords in the page header
 308          *
 309          * @param $text String or array of strings
 310          */
 311         function addKeyword( $text ) {
 312                 if( is_array( $text ) ) {
 313                         $this->mKeywords = array_merge( $this->mKeywords, $text );
 314                 } else {
 315                         array_push( $this->mKeywords, $text );
 316                 }
 317         }
 318
 319         /**
 320          * Add a new \<link\> tag to the page header
 321          *
 322          * @param $linkarr Array: associative array of attributes.
 323          */
 324         function addLink( $linkarr ) {
 325                 array_push( $this->mLinktags, $linkarr );
 326         }
 327
 328         /**
 329          * Add a new \<link\> with "rel" attribute set to "meta"
 330          *
 331          * @param $linkarr Array: associative array mapping attribute names to their
 332          *                 values, both keys and values will be escaped, and the
 333          *                 "rel" attribute will be automatically added
 334          */
 335         function addMetadataLink( $linkarr ) {
 336                 $linkarr['rel'] = $this->getMetadataAttribute();
 337                 $this->addLink( $linkarr );
 338         }
 339
 340         /**
 341          * Get the value of the "rel" attribute for metadata links
 342          *
 343          * @return String
 344          */
 345         public function getMetadataAttribute() {
 346                 # note: buggy CC software only reads first "meta" link
 347                 static $haveMeta = false;
 348                 if ( $haveMeta ) {
 349                         return 'alternate meta';
 350                 } else {
 351                         $haveMeta = true;
 352                         return 'meta';
 353                 }
 354         }
 355
 356         /**
 357          * Add raw HTML to the list of scripts (including \<script\> tag, etc.)
 358          *
 359          * @param $script String: raw HTML
 360          */
 361         function addScript( $script ) {
 362                 $this->mScripts .= $script . "\n";
 363         }
 364
 365         /**
 366          * Register and add a stylesheet from an extension directory.
 367          *
 368          * @param $url String path to sheet.  Provide either a full url (beginning
 369          *             with 'http', etc) or a relative path from the document root
 370          *             (beginning with '/').  Otherwise it behaves identically to
 371          *             addStyle() and draws from the /skins folder.
 372          */
 373         public function addExtensionStyle( $url ) {
 374                 array_push( $this->mExtStyles, $url );
 375         }
 376
 377         /**
 378          * Get all styles added by extensions
 379          *
 380          * @return Array
 381          */
 382         function getExtStyle() {
 383                 return $this->mExtStyles;
 384         }
 385
 386         /**
 387          * Add a JavaScript file out of skins/common, or a given relative path.
 388          *
 389          * @param $file String: filename in skins/common or complete on-server path
 390          *              (/foo/bar.js)
 391          * @param $version String: style version of the file. Defaults to $wgStyleVersion
 392          */
 393         public function addScriptFile( $file, $version = null ) {
 394                 global $wgStylePath, $wgStyleVersion;
 395                 // See if $file parameter is an absolute URL or begins with a slash
 396                 if( substr( $file, 0, 1 ) == '/' || preg_match( '#^[a-z]*://#i', $file ) ) {
 397                         $path = $file;
 398                 } else {
 399                         $path = "{$wgStylePath}/common/{$file}";
 400                 }
 401                 if ( is_null( $version ) )
 402                         $version = $wgStyleVersion;
 403                 $this->addScript( Html::linkedScript( wfAppendQuery( $path, $version ) ) );
 404         }
 405
 406         /**
 407          * Add a self-contained script tag with the given contents
 408          *
 409          * @param $script String: JavaScript text, no <script> tags
 410          */
 411         public function addInlineScript( $script ) {
 412                 $this->mScripts .= Html::inlineScript( "\n$script\n" ) . "\n";
 413         }
 414
 415         /**
 416          * Get all registered JS and CSS tags for the header.
 417          *
 418          * @return String
 419          */
 420         function getScript() {
 421                 return $this->mScripts . $this->getHeadItems();
 422         }
 423
 424         /**
 425          * Filter an array of modules to remove insufficiently trustworthy members, and modules
 426          * which are no longer registered (eg a page is cached before an extension is disabled)
 427          * @param $modules Array
 428          * @param $position String if not null, only return modules with this position
 429          * @param $type string
 430          * @return Array
 431          */
 432         protected function filterModules( $modules, $position = null, $type = ResourceLoaderModule::TYPE_COMBINED ){
 433                 $resourceLoader = $this->getResourceLoader();
 434                 $filteredModules = array();
 435                 foreach( $modules as $val ){
 436                         $module = $resourceLoader->getModule( $val );
 437                         if( $module instanceof ResourceLoaderModule
 438                                 && $module->getOrigin() <= $this->getAllowedModules( $type )
 439                                 && ( is_null( $position ) || $module->getPosition() == $position ) )
 440                         {
 441                                 $filteredModules[] = $val;
 442                         }
 443                 }
 444                 return $filteredModules;
 445         }
 446
 447         /**
 448          * Get the list of modules to include on this page
 449          *
 450          * @param $filter Bool whether to filter out insufficiently trustworthy modules
 451          * @param $position String if not null, only return modules with this position
 452          * @param $param string
 453          * @return Array of module names
 454          */
 455         public function getModules( $filter = false, $position = null, $param = 'mModules' ) {
 456                 $modules = array_values( array_unique( $this->$param ) );
 457                 return $filter
 458                         ? $this->filterModules( $modules, $position )
 459                         : $modules;
 460         }
 461
 462         /**
 463          * Add one or more modules recognized by the resource loader. Modules added
 464          * through this function will be loaded by the resource loader when the
 465          * page loads.
 466          *
 467          * @param $modules Mixed: module name (string) or array of module names
 468          */
 469         public function addModules( $modules ) {
 470                 $this->mModules = array_merge( $this->mModules, (array)$modules );
 471         }
 472
 473         /**
 474          * Get the list of module JS to include on this page
 475          *
 476          * @param $filter
 477          * @param $position
 478          *
 479          * @return array of module names
 480          */
 481         public function getModuleScripts( $filter = false, $position = null ) {
 482                 return $this->getModules( $filter, $position, 'mModuleScripts' );
 483         }
 484
 485         /**
 486          * Add only JS of one or more modules recognized by the resource loader. Module
 487          * scripts added through this function will be loaded by the resource loader when
 488          * the page loads.
 489          *
 490          * @param $modules Mixed: module name (string) or array of module names
 491          */
 492         public function addModuleScripts( $modules ) {
 493                 $this->mModuleScripts = array_merge( $this->mModuleScripts, (array)$modules );
 494         }
 495
 496         /**
 497          * Get the list of module CSS to include on this page
 498          *
 499          * @param $filter
 500          * @param $position
 501          *
 502          * @return Array of module names
 503          */
 504         public function getModuleStyles( $filter = false, $position = null ) {
 505                 return $this->getModules( $filter,  $position, 'mModuleStyles' );
 506         }
 507
 508         /**
 509          * Add only CSS of one or more modules recognized by the resource loader. Module
 510          * styles added through this function will be loaded by the resource loader when
 511          * the page loads.
 512          *
 513          * @param $modules Mixed: module name (string) or array of module names
 514          */
 515         public function addModuleStyles( $modules ) {
 516                 $this->mModuleStyles = array_merge( $this->mModuleStyles, (array)$modules );
 517         }
 518
 519         /**
 520          * Get the list of module messages to include on this page
 521          *
 522          * @param $filter
 523          * @param $position
 524          *
 525          * @return Array of module names
 526          */
 527         public function getModuleMessages( $filter = false, $position = null ) {
 528                 return $this->getModules( $filter, $position, 'mModuleMessages' );
 529         }
 530
 531         /**
 532          * Add only messages of one or more modules recognized by the resource loader.
 533          * Module messages added through this function will be loaded by the resource
 534          * loader when the page loads.
 535          *
 536          * @param $modules Mixed: module name (string) or array of module names
 537          */
 538         public function addModuleMessages( $modules ) {
 539                 $this->mModuleMessages = array_merge( $this->mModuleMessages, (array)$modules );
 540         }
 541
 542         /**
 543          * Get an array of head items
 544          *
 545          * @return Array
 546          */
 547         function getHeadItemsArray() {
 548                 return $this->mHeadItems;
 549         }
 550
 551         /**
 552          * Get all header items in a string
 553          *
 554          * @return String
 555          */
 556         function getHeadItems() {
 557                 $s = '';
 558                 foreach ( $this->mHeadItems as $item ) {
 559                         $s .= $item;
 560                 }
 561                 return $s;
 562         }
 563
 564         /**
 565          * Add or replace an header item to the output
 566          *
 567          * @param $name String: item name
 568          * @param $value String: raw HTML
 569          */
 570         public function addHeadItem( $name, $value ) {
 571                 $this->mHeadItems[$name] = $value;
 572         }
 573
 574         /**
 575          * Check if the header item $name is already set
 576          *
 577          * @param $name String: item name
 578          * @return Boolean
 579          */
 580         public function hasHeadItem( $name ) {
 581                 return isset( $this->mHeadItems[$name] );
 582         }
 583
 584         /**
 585          * Set the value of the ETag HTTP header, only used if $wgUseETag is true
 586          *
 587          * @param $tag String: value of "ETag" header
 588          */
 589         function setETag( $tag ) {
 590                 $this->mETag = $tag;
 591         }
 592
 593         /**
 594          * Set whether the output should only contain the body of the article,
 595          * without any skin, sidebar, etc.
 596          * Used e.g. when calling with "action=render".
 597          *
 598          * @param $only Boolean: whether to output only the body of the article
 599          */
 600         public function setArticleBodyOnly( $only ) {
 601                 $this->mArticleBodyOnly = $only;
 602         }
 603
 604         /**
 605          * Return whether the output will contain only the body of the article
 606          *
 607          * @return Boolean
 608          */
 609         public function getArticleBodyOnly() {
 610                 return $this->mArticleBodyOnly;
 611         }
 612
 613         /**
 614          * checkLastModified tells the client to use the client-cached page if
 615          * possible. If sucessful, the OutputPage is disabled so that
 616          * any future call to OutputPage->output() have no effect.
 617          *
 618          * Side effect: sets mLastModified for Last-Modified header
 619          *
 620          * @param $timestamp string
 621          *
 622          * @return Boolean: true iff cache-ok headers was sent.
 623          */
 624         public function checkLastModified( $timestamp ) {
 625                 global $wgCachePages, $wgCacheEpoch;
 626
 627                 if ( !$timestamp || $timestamp == '19700101000000' ) {
 628                         wfDebug( __METHOD__ . ": CACHE DISABLED, NO TIMESTAMP\n" );
 629                         return false;
 630                 }
 631                 if( !$wgCachePages ) {
 632                         wfDebug( __METHOD__ . ": CACHE DISABLED\n", false );
 633                         return false;
 634                 }
 635                 if( $this->getUser()->getOption( 'nocache' ) ) {
 636                         wfDebug( __METHOD__ . ": USER DISABLED CACHE\n", false );
 637                         return false;
 638                 }
 639
 640                 $timestamp = wfTimestamp( TS_MW, $timestamp );
 641                 $modifiedTimes = array(
 642                         'page' => $timestamp,
 643                         'user' => $this->getUser()->getTouched(),
 644                         'epoch' => $wgCacheEpoch
 645                 );
 646                 wfRunHooks( 'OutputPageCheckLastModified', array( &$modifiedTimes ) );
 647
 648                 $maxModified = max( $modifiedTimes );
 649                 $this->mLastModified = wfTimestamp( TS_RFC2822, $maxModified );
 650
 651                 if( empty( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) ) {
 652                         wfDebug( __METHOD__ . ": client did not send If-Modified-Since header\n", false );
 653                         return false;
 654                 }
 655
 656                 # Make debug info
 657                 $info = '';
 658                 foreach ( $modifiedTimes as $name => $value ) {
 659                         if ( $info !== '' ) {
 660                                 $info .= ', ';
 661                         }
 662                         $info .= "$name=" . wfTimestamp( TS_ISO_8601, $value );
 663                 }
 664
 665                 # IE sends sizes after the date like this:
 666                 # Wed, 20 Aug 2003 06:51:19 GMT; length=5202
 667                 # this breaks strtotime().
 668                 $clientHeader = preg_replace( '/;.*$/', '', $_SERVER["HTTP_IF_MODIFIED_SINCE"] );
 669
 670                 wfSuppressWarnings(); // E_STRICT system time bitching
 671                 $clientHeaderTime = strtotime( $clientHeader );
 672                 wfRestoreWarnings();
 673                 if ( !$clientHeaderTime ) {
 674                         wfDebug( __METHOD__ . ": unable to parse the client's If-Modified-Since header: $clientHeader\n" );
 675                         return false;
 676                 }
 677                 $clientHeaderTime = wfTimestamp( TS_MW, $clientHeaderTime );
 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         }
 781
 782         /**
 783          * "HTML title" means the contents of <title>.
 784          * It is stored as plain, unescaped text and will be run through htmlspecialchars in the skin file.
 785          *
 786          * @param $name string
 787          */
 788         public function setHTMLTitle( $name ) {
 789                 if ( $name instanceof Message ) {
 790                         $this->mHTMLtitle = $name->setContext( $this->getContext() )->text();
 791                 } else {
 792                         $this->mHTMLtitle = $name;
 793                 }
 794         }
 795
 796         /**
 797          * Return the "HTML title", i.e. the content of the <title> tag.
 798          *
 799          * @return String
 800          */
 801         public function getHTMLTitle() {
 802                 return $this->mHTMLtitle;
 803         }
 804
 805         /**
 806          * Set $mRedirectedFrom, the Title of the page which redirected us to the current page.
 807          *
 808          * param @t Title
 809          */
 810         public function setRedirectedFrom( $t ) {
 811                 $this->mRedirectedFrom = $t;
 812         }
 813
 814         /**
 815          * "Page title" means the contents of \<h1\>. It is stored as a valid HTML fragment.
 816          * This function allows good tags like \<sup\> in the \<h1\> tag, but not bad tags like \<script\>.
 817          * This function automatically sets \<title\> to the same content as \<h1\> but with all tags removed.
 818          * Bad tags that were escaped in \<h1\> will still be escaped in \<title\>, and good tags like \<i\> will be dropped entirely.
 819          *
 820          * @param $name string|Message
 821          */
 822         public function setPageTitle( $name ) {
 823                 if ( $name instanceof Message ) {
 824                         $name = $name->setContext( $this->getContext() )->text();
 825                 }
 826
 827                 # change "<script>foo&bar</script>" to "&lt;script&gt;foo&amp;bar&lt;/script&gt;"
 828                 # but leave "<i>foobar</i>" alone
 829                 $nameWithTags = Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags( $name ) );
 830                 $this->mPagetitle = $nameWithTags;
 831
 832                 # change "<i>foo&amp;bar</i>" to "foo&bar"
 833                 $this->setHTMLTitle( $this->msg( 'pagetitle' )->rawParams( Sanitizer::stripAllTags( $nameWithTags ) ) );
 834         }
 835
 836         /**
 837          * Return the "page title", i.e. the content of the \<h1\> tag.
 838          *
 839          * @return String
 840          */
 841         public function getPageTitle() {
 842                 return $this->mPagetitle;
 843         }
 844
 845         /**
 846          * Set the Title object to use
 847          *
 848          * @param $t Title object
 849          */
 850         public function setTitle( Title $t ) {
 851                 $this->getContext()->setTitle( $t );
 852         }
 853
 854
 855         /**
 856          * Replace the subtile with $str
 857          *
 858          * @param $str String|Message: new value of the subtitle
 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
 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          * Add $text to the debug output
1319          *
1320          * @param $text String: debug text
1321          */
1322         public function debug( $text ) {
1323                 $this->mDebugtext .= $text;
1324         }
1325
1326         /**
1327          * Get/set the ParserOptions object to use for wikitext parsing
1328          *
1329          * @param $options ParserOptions|null either the ParserOption to use or null to only get the
1330          *                 current ParserOption object
1331          * @return ParserOptions object
1332          */
1333         public function parserOptions( $options = null ) {
1334                 if ( !$this->mParserOptions ) {
1335                         $this->mParserOptions = ParserOptions::newFromContext( $this->getContext() );
1336                         $this->mParserOptions->setEditSection( false );
1337                 }
1338                 return wfSetVar( $this->mParserOptions, $options );
1339         }
1340
1341         /**
1342          * Set the revision ID which will be seen by the wiki text parser
1343          * for things such as embedded {{REVISIONID}} variable use.
1344          *
1345          * @param $revid Mixed: an positive integer, or null
1346          * @return Mixed: previous value
1347          */
1348         public function setRevisionId( $revid ) {
1349                 $val = is_null( $revid ) ? null : intval( $revid );
1350                 return wfSetVar( $this->mRevisionId, $val );
1351         }
1352
1353         /**
1354          * Get the displayed revision ID
1355          *
1356          * @return Integer
1357          */
1358         public function getRevisionId() {
1359                 return $this->mRevisionId;
1360         }
1361
1362         /**
1363          * Set the timestamp of the revision which will be displayed. This is used
1364          * to avoid a extra DB call in Skin::lastModified().
1365          *
1366          * @param $revid Mixed: string, or null
1367          * @return Mixed: previous value
1368          */
1369         public function setRevisionTimestamp( $timestmap ) {
1370                 return wfSetVar( $this->mRevisionTimestamp, $timestmap );
1371         }
1372
1373         /**
1374          * Get the timestamp of displayed revision.
1375          * This will be null if not filled by setRevisionTimestamp().
1376          *
1377          * @return String or null
1378          */
1379         public function getRevisionTimestamp() {
1380                 return $this->mRevisionTimestamp;
1381         }
1382
1383         /**
1384          * Set the displayed file version
1385          *
1386          * @param $file File|bool
1387          * @return Mixed: previous value
1388          */
1389         public function setFileVersion( $file ) {
1390                 $val = null;
1391                 if ( $file instanceof File && $file->exists() ) {
1392                         $val = array( 'time' => $file->getTimestamp(), 'sha1' => $file->getSha1() );
1393                 }
1394                 return wfSetVar( $this->mFileVersion, $val, true );
1395         }
1396
1397         /**
1398          * Get the displayed file version
1399          *
1400          * @return Array|null ('time' => MW timestamp, 'sha1' => sha1)
1401          */
1402         public function getFileVersion() {
1403                 return $this->mFileVersion;
1404         }
1405
1406         /**
1407          * Get the templates used on this page
1408          *
1409          * @return Array (namespace => dbKey => revId)
1410          * @since 1.18
1411          */
1412         public function getTemplateIds() {
1413                 return $this->mTemplateIds;
1414         }
1415
1416         /**
1417          * Get the files used on this page
1418          *
1419          * @return Array (dbKey => array('time' => MW timestamp or null, 'sha1' => sha1 or ''))
1420          * @since 1.18
1421          */
1422         public function getFileSearchOptions() {
1423                 return $this->mImageTimeKeys;
1424         }
1425
1426         /**
1427          * Convert wikitext to HTML and add it to the buffer
1428          * Default assumes that the current page title will be used.
1429          *
1430          * @param $text String
1431          * @param $linestart Boolean: is this the start of a line?
1432          * @param $interface Boolean: is this text in the user interface language?
1433          */
1434         public function addWikiText( $text, $linestart = true, $interface = true ) {
1435                 $title = $this->getTitle(); // Work arround E_STRICT
1436                 $this->addWikiTextTitle( $text, $title, $linestart, /*tidy*/false, $interface );
1437         }
1438
1439         /**
1440          * Add wikitext with a custom Title object
1441          *
1442          * @param $text String: wikitext
1443          * @param $title Title object
1444          * @param $linestart Boolean: is this the start of a line?
1445          */
1446         public function addWikiTextWithTitle( $text, &$title, $linestart = true ) {
1447                 $this->addWikiTextTitle( $text, $title, $linestart );
1448         }
1449
1450         /**
1451          * Add wikitext with a custom Title object and tidy enabled.
1452          *
1453          * @param $text String: wikitext
1454          * @param $title Title object
1455          * @param $linestart Boolean: is this the start of a line?
1456          */
1457         function addWikiTextTitleTidy( $text, &$title, $linestart = true ) {
1458                 $this->addWikiTextTitle( $text, $title, $linestart, true );
1459         }
1460
1461         /**
1462          * Add wikitext with tidy enabled
1463          *
1464          * @param $text String: wikitext
1465          * @param $linestart Boolean: is this the start of a line?
1466          */
1467         public function addWikiTextTidy( $text, $linestart = true ) {
1468                 $title = $this->getTitle();
1469                 $this->addWikiTextTitleTidy( $text, $title, $linestart );
1470         }
1471
1472         /**
1473          * Add wikitext with a custom Title object
1474          *
1475          * @param $text String: wikitext
1476          * @param $title Title object
1477          * @param $linestart Boolean: is this the start of a line?
1478          * @param $tidy Boolean: whether to use tidy
1479          * @param $interface Boolean: whether it is an interface message
1480          *                                                              (for example disables conversion)
1481          */
1482         public function addWikiTextTitle( $text, &$title, $linestart, $tidy = false, $interface = false ) {
1483                 global $wgParser;
1484
1485                 wfProfileIn( __METHOD__ );
1486
1487                 $popts = $this->parserOptions();
1488                 $oldTidy = $popts->setTidy( $tidy );
1489                 $popts->setInterfaceMessage( (bool) $interface );
1490
1491                 $parserOutput = $wgParser->parse(
1492                         $text, $title, $popts,
1493                         $linestart, true, $this->mRevisionId
1494                 );
1495
1496                 $popts->setTidy( $oldTidy );
1497
1498                 $this->addParserOutput( $parserOutput );
1499
1500                 wfProfileOut( __METHOD__ );
1501         }
1502
1503         /**
1504          * Add a ParserOutput object, but without Html
1505          *
1506          * @param $parserOutput ParserOutput object
1507          */
1508         public function addParserOutputNoText( &$parserOutput ) {
1509                 $this->mLanguageLinks += $parserOutput->getLanguageLinks();
1510                 $this->addCategoryLinks( $parserOutput->getCategories() );
1511                 $this->mNewSectionLink = $parserOutput->getNewSection();
1512                 $this->mHideNewSectionLink = $parserOutput->getHideNewSection();
1513
1514                 $this->mParseWarnings = $parserOutput->getWarnings();
1515                 if ( !$parserOutput->isCacheable() ) {
1516                         $this->enableClientCache( false );
1517                 }
1518                 $this->mNoGallery = $parserOutput->getNoGallery();
1519                 $this->mHeadItems = array_merge( $this->mHeadItems, $parserOutput->getHeadItems() );
1520                 $this->addModules( $parserOutput->getModules() );
1521                 $this->addModuleScripts( $parserOutput->getModuleScripts() );
1522                 $this->addModuleStyles( $parserOutput->getModuleStyles() );
1523                 $this->addModuleMessages( $parserOutput->getModuleMessages() );
1524
1525                 // Template versioning...
1526                 foreach ( (array)$parserOutput->getTemplateIds() as $ns => $dbks ) {
1527                         if ( isset( $this->mTemplateIds[$ns] ) ) {
1528                                 $this->mTemplateIds[$ns] = $dbks + $this->mTemplateIds[$ns];
1529                         } else {
1530                                 $this->mTemplateIds[$ns] = $dbks;
1531                         }
1532                 }
1533                 // File versioning...
1534                 foreach ( (array)$parserOutput->getFileSearchOptions() as $dbk => $data ) {
1535                         $this->mImageTimeKeys[$dbk] = $data;
1536                 }
1537
1538                 // Hooks registered in the object
1539                 global $wgParserOutputHooks;
1540                 foreach ( $parserOutput->getOutputHooks() as $hookInfo ) {
1541                         list( $hookName, $data ) = $hookInfo;
1542                         if ( isset( $wgParserOutputHooks[$hookName] ) ) {
1543                                 call_user_func( $wgParserOutputHooks[$hookName], $this, $parserOutput, $data );
1544                         }
1545                 }
1546
1547                 wfRunHooks( 'OutputPageParserOutput', array( &$this, $parserOutput ) );
1548         }
1549
1550         /**
1551          * Add a ParserOutput object
1552          *
1553          * @param $parserOutput ParserOutput
1554          */
1555         function addParserOutput( &$parserOutput ) {
1556                 $this->addParserOutputNoText( $parserOutput );
1557                 $text = $parserOutput->getText();
1558                 wfRunHooks( 'OutputPageBeforeHTML', array( &$this, &$text ) );
1559                 $this->addHTML( $text );
1560         }
1561
1562
1563         /**
1564          * Add the output of a QuickTemplate to the output buffer
1565          *
1566          * @param $template QuickTemplate
1567          */
1568         public function addTemplate( &$template ) {
1569                 ob_start();
1570                 $template->execute();
1571                 $this->addHTML( ob_get_contents() );
1572                 ob_end_clean();
1573         }
1574
1575         /**
1576          * Parse wikitext and return the HTML.
1577          *
1578          * @param $text String
1579          * @param $linestart Boolean: is this the start of a line?
1580          * @param $interface Boolean: use interface language ($wgLang instead of
1581          *                   $wgContLang) while parsing language sensitive magic
1582          *                   words like GRAMMAR and PLURAL. This also disables
1583          *                                       LanguageConverter.
1584          * @param $language  Language object: target language object, will override
1585          *                   $interface
1586          * @return String: HTML
1587          */
1588         public function parse( $text, $linestart = true, $interface = false, $language = null ) {
1589                 global $wgParser;
1590
1591                 if( is_null( $this->getTitle() ) ) {
1592                         throw new MWException( 'Empty $mTitle in ' . __METHOD__ );
1593                 }
1594
1595                 $popts = $this->parserOptions();
1596                 if ( $interface ) {
1597                         $popts->setInterfaceMessage( true );
1598                 }
1599                 if ( $language !== null ) {
1600                         $oldLang = $popts->setTargetLanguage( $language );
1601                 }
1602
1603                 $parserOutput = $wgParser->parse(
1604                         $text, $this->getTitle(), $popts,
1605                         $linestart, true, $this->mRevisionId
1606                 );
1607
1608                 if ( $interface ) {
1609                         $popts->setInterfaceMessage( false );
1610                 }
1611                 if ( $language !== null ) {
1612                         $popts->setTargetLanguage( $oldLang );
1613                 }
1614
1615                 return $parserOutput->getText();
1616         }
1617
1618         /**
1619          * Parse wikitext, strip paragraphs, and return the HTML.
1620          *
1621          * @param $text String
1622          * @param $linestart Boolean: is this the start of a line?
1623          * @param $interface Boolean: use interface language ($wgLang instead of
1624          *                   $wgContLang) while parsing language sensitive magic
1625          *                   words like GRAMMAR and PLURAL
1626          * @return String: HTML
1627          */
1628         public function parseInline( $text, $linestart = true, $interface = false ) {
1629                 $parsed = $this->parse( $text, $linestart, $interface );
1630
1631                 $m = array();
1632                 if ( preg_match( '/^<p>(.*)\n?<\/p>\n?/sU', $parsed, $m ) ) {
1633                         $parsed = $m[1];
1634                 }
1635
1636                 return $parsed;
1637         }
1638
1639         /**
1640          * Set the value of the "s-maxage" part of the "Cache-control" HTTP header
1641          *
1642          * @param $maxage Integer: maximum cache time on the Squid, in seconds.
1643          */
1644         public function setSquidMaxage( $maxage ) {
1645                 $this->mSquidMaxage = $maxage;
1646         }
1647
1648         /**
1649          * Use enableClientCache(false) to force it to send nocache headers
1650          *
1651          * @param $state bool
1652          *
1653          * @return bool
1654          */
1655         public function enableClientCache( $state ) {
1656                 return wfSetVar( $this->mEnableClientCache, $state );
1657         }
1658
1659         /**
1660          * Get the list of cookies that will influence on the cache
1661          *
1662          * @return Array
1663          */
1664         function getCacheVaryCookies() {
1665                 global $wgCookiePrefix, $wgCacheVaryCookies;
1666                 static $cookies;
1667                 if ( $cookies === null ) {
1668                         $cookies = array_merge(
1669                                 array(
1670                                         "{$wgCookiePrefix}Token",
1671                                         "{$wgCookiePrefix}LoggedOut",
1672                                         session_name()
1673                                 ),
1674                                 $wgCacheVaryCookies
1675                         );
1676                         wfRunHooks( 'GetCacheVaryCookies', array( $this, &$cookies ) );
1677                 }
1678                 return $cookies;
1679         }
1680
1681         /**
1682          * Check if the request has a cache-varying cookie header
1683          * If it does, it's very important that we don't allow public caching
1684          *
1685          * @return Boolean
1686          */
1687         function haveCacheVaryCookies() {
1688                 $cookieHeader = $this->getRequest()->getHeader( 'cookie' );
1689                 if ( $cookieHeader === false ) {
1690                         return false;
1691                 }
1692                 $cvCookies = $this->getCacheVaryCookies();
1693                 foreach ( $cvCookies as $cookieName ) {
1694                         # Check for a simple string match, like the way squid does it
1695                         if ( strpos( $cookieHeader, $cookieName ) !== false ) {
1696                                 wfDebug( __METHOD__ . ": found $cookieName\n" );
1697                                 return true;
1698                         }
1699                 }
1700                 wfDebug( __METHOD__ . ": no cache-varying cookies found\n" );
1701                 return false;
1702         }
1703
1704         /**
1705          * Add an HTTP header that will influence on the cache
1706          *
1707          * @param $header String: header name
1708          * @param $option Array|null
1709          * @todo FIXME: Document the $option parameter; it appears to be for
1710          *        X-Vary-Options but what format is acceptable?
1711          */
1712         public function addVaryHeader( $header, $option = null ) {
1713                 if ( !array_key_exists( $header, $this->mVaryHeader ) ) {
1714                         $this->mVaryHeader[$header] = (array)$option;
1715                 } elseif( is_array( $option ) ) {
1716                         if( is_array( $this->mVaryHeader[$header] ) ) {
1717                                 $this->mVaryHeader[$header] = array_merge( $this->mVaryHeader[$header], $option );
1718                         } else {
1719                                 $this->mVaryHeader[$header] = $option;
1720                         }
1721                 }
1722                 $this->mVaryHeader[$header] = array_unique( (array)$this->mVaryHeader[$header] );
1723         }
1724
1725         /**
1726          * Get a complete X-Vary-Options header
1727          *
1728          * @return String
1729          */
1730         public function getXVO() {
1731                 $cvCookies = $this->getCacheVaryCookies();
1732
1733                 $cookiesOption = array();
1734                 foreach ( $cvCookies as $cookieName ) {
1735                         $cookiesOption[] = 'string-contains=' . $cookieName;
1736                 }
1737                 $this->addVaryHeader( 'Cookie', $cookiesOption );
1738
1739                 $headers = array();
1740                 foreach( $this->mVaryHeader as $header => $option ) {
1741                         $newheader = $header;
1742                         if( is_array( $option ) ) {
1743                                 $newheader .= ';' . implode( ';', $option );
1744                         }
1745                         $headers[] = $newheader;
1746                 }
1747                 $xvo = 'X-Vary-Options: ' . implode( ',', $headers );
1748
1749                 return $xvo;
1750         }
1751
1752         /**
1753          * bug 21672: Add Accept-Language to Vary and XVO headers
1754          * if there's no 'variant' parameter existed in GET.
1755          *
1756          * For example:
1757          *   /w/index.php?title=Main_page should always be served; but
1758          *   /w/index.php?title=Main_page&variant=zh-cn should never be served.
1759          */
1760         function addAcceptLanguage() {
1761                 $lang = $this->getTitle()->getPageLanguage();
1762                 if( !$this->getRequest()->getCheck( 'variant' ) && $lang->hasVariants() ) {
1763                         $variants = $lang->getVariants();
1764                         $aloption = array();
1765                         foreach ( $variants as $variant ) {
1766                                 if( $variant === $lang->getCode() ) {
1767                                         continue;
1768                                 } else {
1769                                         $aloption[] = 'string-contains=' . $variant;
1770
1771                                         // IE and some other browsers use another form of language code
1772                                         // in their Accept-Language header, like "zh-CN" or "zh-TW".
1773                                         // We should handle these too.
1774                                         $ievariant = explode( '-', $variant );
1775                                         if ( count( $ievariant ) == 2 ) {
1776                                                 $ievariant[1] = strtoupper( $ievariant[1] );
1777                                                 $ievariant = implode( '-', $ievariant );
1778                                                 $aloption[] = 'string-contains=' . $ievariant;
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->addAcceptLanguage();
1838
1839                 # don't serve compressed data to clients who can't handle it
1840                 # maintain different caches for logged-in users and non-logged in ones
1841                 $response->header( 'Vary: ' . join( ', ', array_keys( $this->mVaryHeader ) ) );
1842
1843                 if ( $wgUseXVO ) {
1844                         # Add an X-Vary-Options header for Squid with Wikimedia patches
1845                         $response->header( $this->getXVO() );
1846                 }
1847
1848                 if( $this->mEnableClientCache ) {
1849                         if(
1850                                 $wgUseSquid && session_id() == '' && !$this->isPrintable() &&
1851                                 $this->mSquidMaxage != 0 && !$this->haveCacheVaryCookies()
1852                         )
1853                         {
1854                                 if ( $wgUseESI ) {
1855                                         # We'll purge the proxy cache explicitly, but require end user agents
1856                                         # to revalidate against the proxy on each visit.
1857                                         # Surrogate-Control controls our Squid, Cache-Control downstream caches
1858                                         wfDebug( __METHOD__ . ": proxy caching with ESI; {$this->mLastModified} **\n", false );
1859                                         # start with a shorter timeout for initial testing
1860                                         # header( 'Surrogate-Control: max-age=2678400+2678400, content="ESI/1.0"');
1861                                         $response->header( 'Surrogate-Control: max-age='.$wgSquidMaxage.'+'.$this->mSquidMaxage.', content="ESI/1.0"');
1862                                         $response->header( 'Cache-Control: s-maxage=0, must-revalidate, max-age=0' );
1863                                 } else {
1864                                         # We'll purge the proxy cache for anons explicitly, but require end user agents
1865                                         # to revalidate against the proxy on each visit.
1866                                         # IMPORTANT! The Squid needs to replace the Cache-Control header with
1867                                         # Cache-Control: s-maxage=0, must-revalidate, max-age=0
1868                                         wfDebug( __METHOD__ . ": local proxy caching; {$this->mLastModified} **\n", false );
1869                                         # start with a shorter timeout for initial testing
1870                                         # header( "Cache-Control: s-maxage=2678400, must-revalidate, max-age=0" );
1871                                         $response->header( 'Cache-Control: s-maxage='.$this->mSquidMaxage.', must-revalidate, max-age=0' );
1872                                 }
1873                         } else {
1874                                 # We do want clients to cache if they can, but they *must* check for updates
1875                                 # on revisiting the page.
1876                                 wfDebug( __METHOD__ . ": private caching; {$this->mLastModified} **\n", false );
1877                                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1878                                 $response->header( "Cache-Control: private, must-revalidate, max-age=0" );
1879                         }
1880                         if($this->mLastModified) {
1881                                 $response->header( "Last-Modified: {$this->mLastModified}" );
1882                         }
1883                 } else {
1884                         wfDebug( __METHOD__ . ": no caching **\n", false );
1885
1886                         # In general, the absence of a last modified header should be enough to prevent
1887                         # the client from using its cache. We send a few other things just to make sure.
1888                         $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1889                         $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
1890                         $response->header( 'Pragma: no-cache' );
1891                 }
1892         }
1893
1894         /**
1895          * Get the message associed with the HTTP response code $code
1896          *
1897          * @param $code Integer: status code
1898          * @return String or null: message or null if $code is not in the list of
1899          *         messages
1900          *
1901          * @deprecated since 1.18 Use HttpStatus::getMessage() instead.
1902          */
1903         public static function getStatusMessage( $code ) {
1904                 wfDeprecated( __METHOD__ );
1905                 return HttpStatus::getMessage( $code );
1906         }
1907
1908         /**
1909          * Finally, all the text has been munged and accumulated into
1910          * the object, let's actually output it:
1911          */
1912         public function output() {
1913                 global $wgLanguageCode, $wgDebugRedirects, $wgMimeType, $wgVaryOnXFP;
1914
1915                 if( $this->mDoNothing ) {
1916                         return;
1917                 }
1918
1919                 wfProfileIn( __METHOD__ );
1920
1921                 $response = $this->getRequest()->response();
1922
1923                 if ( $this->mRedirect != '' ) {
1924                         # Standards require redirect URLs to be absolute
1925                         $this->mRedirect = wfExpandUrl( $this->mRedirect, PROTO_CURRENT );
1926
1927                         $redirect = $this->mRedirect;
1928                         $code = $this->mRedirectCode;
1929
1930                         if( wfRunHooks( "BeforePageRedirect", array( $this, &$redirect, &$code ) ) ) {
1931                                 if( $code == '301' || $code == '303' ) {
1932                                         if( !$wgDebugRedirects ) {
1933                                                 $message = HttpStatus::getMessage( $code );
1934                                                 $response->header( "HTTP/1.1 $code $message" );
1935                                         }
1936                                         $this->mLastModified = wfTimestamp( TS_RFC2822 );
1937                                 }
1938                                 if ( $wgVaryOnXFP ) {
1939                                         $this->addVaryHeader( 'X-Forwarded-Proto' );
1940                                 }
1941                                 $this->sendCacheControl();
1942
1943                                 $response->header( "Content-Type: text/html; charset=utf-8" );
1944                                 if( $wgDebugRedirects ) {
1945                                         $url = htmlspecialchars( $redirect );
1946                                         print "<html>\n<head>\n<title>Redirect</title>\n</head>\n<body>\n";
1947                                         print "<p>Location: <a href=\"$url\">$url</a></p>\n";
1948                                         print "</body>\n</html>\n";
1949                                 } else {
1950                                         $response->header( 'Location: ' . $redirect );
1951                                 }
1952                         }
1953
1954                         wfProfileOut( __METHOD__ );
1955                         return;
1956                 } elseif ( $this->mStatusCode ) {
1957                         $message = HttpStatus::getMessage( $this->mStatusCode );
1958                         if ( $message ) {
1959                                 $response->header( 'HTTP/1.1 ' . $this->mStatusCode . ' ' . $message );
1960                         }
1961                 }
1962
1963                 # Buffer output; final headers may depend on later processing
1964                 ob_start();
1965
1966                 $response->header( "Content-type: $wgMimeType; charset=UTF-8" );
1967                 $response->header( 'Content-language: ' . $wgLanguageCode );
1968
1969                 // Prevent framing, if requested
1970                 $frameOptions = $this->getFrameOptions();
1971                 if ( $frameOptions ) {
1972                         $response->header( "X-Frame-Options: $frameOptions" );
1973                 }
1974
1975                 if ( $this->mArticleBodyOnly ) {
1976                         $this->out( $this->mBodytext );
1977                 } else {
1978                         $this->addDefaultModules();
1979
1980                         $sk = $this->getSkin();
1981
1982                         // Hook that allows last minute changes to the output page, e.g.
1983                         // adding of CSS or Javascript by extensions.
1984                         wfRunHooks( 'BeforePageDisplay', array( &$this, &$sk ) );
1985
1986                         wfProfileIn( 'Output-skin' );
1987                         $sk->outputPage();
1988                         wfProfileOut( 'Output-skin' );
1989                 }
1990
1991                 $this->sendCacheControl();
1992                 ob_end_flush();
1993                 wfProfileOut( __METHOD__ );
1994         }
1995
1996         /**
1997          * Actually output something with print().
1998          *
1999          * @param $ins String: the string to output
2000          */
2001         public function out( $ins ) {
2002                 print $ins;
2003         }
2004
2005         /**
2006          * Produce a "user is blocked" page.
2007          * @deprecated since 1.18
2008          */
2009         function blockedPage() {
2010                 throw new UserBlockedError( $this->getUser()->mBlock );
2011         }
2012
2013         /**
2014          * Prepare this object to display an error page; disable caching and
2015          * indexing, clear the current text and redirect, set the page's title
2016          * and optionally an custom HTML title (content of the <title> tag).
2017          *
2018          * @param $pageTitle String|Message will be passed directly to setPageTitle()
2019          * @param $htmlTitle String|Message will be passed directly to setHTMLTitle();
2020          *                   optional, if not passed the <title> attribute will be
2021          *                   based on $pageTitle
2022          */
2023         public function prepareErrorPage( $pageTitle, $htmlTitle = false ) {
2024                 if ( $this->getTitle() ) {
2025                         $this->mDebugtext .= 'Original title: ' . $this->getTitle()->getPrefixedText() . "\n";
2026                 }
2027
2028                 $this->setPageTitle( $pageTitle );
2029                 if ( $htmlTitle !== false ) {
2030                         $this->setHTMLTitle( $htmlTitle );
2031                 }
2032                 $this->setRobotPolicy( 'noindex,nofollow' );
2033                 $this->setArticleRelated( false );
2034                 $this->enableClientCache( false );
2035                 $this->mRedirect = '';
2036                 $this->clearSubtitle();
2037                 $this->clearHTML();
2038         }
2039
2040         /**
2041          * Output a standard error page
2042          *
2043          * showErrorPage( 'titlemsg', 'pagetextmsg', array( 'param1', 'param2' ) );
2044          * showErrorPage( 'titlemsg', $messageObject );
2045          *
2046          * @param $title String: message key for page title
2047          * @param $msg Mixed: message key (string) for page text, or a Message object
2048          * @param $params Array: message parameters; ignored if $msg is a Message object
2049          */
2050         public function showErrorPage( $title, $msg, $params = array() ) {
2051                 $this->prepareErrorPage( $this->msg( $title ), $this->msg( 'errorpagetitle' ) );
2052
2053                 if ( $msg instanceof Message ){
2054                         $this->addHTML( $msg->parse() );
2055                 } else {
2056                         $this->addWikiMsgArray( $msg, $params );
2057                 }
2058
2059                 $this->returnToMain();
2060         }
2061
2062         /**
2063          * Output a standard permission error page
2064          *
2065          * @param $errors Array: error message keys
2066          * @param $action String: action that was denied or null if unknown
2067          */
2068         public function showPermissionsErrorPage( $errors, $action = null ) {
2069                 global $wgGroupPermissions;
2070
2071                 // For some action (read, edit, create and upload), display a "login to do this action"
2072                 // error if all of the following conditions are met:
2073                 // 1. the user is not logged in
2074                 // 2. the only error is insufficient permissions (i.e. no block or something else)
2075                 // 3. the error can be avoided simply by logging in
2076                 if ( in_array( $action, array( 'read', 'edit', 'createpage', 'createtalk', 'upload' ) )
2077                         && $this->getUser()->isAnon() && count( $errors ) == 1 && isset( $errors[0][0] )
2078                         && ( $errors[0][0] == 'badaccess-groups' || $errors[0][0] == 'badaccess-group0' )
2079                         && ( ( isset( $wgGroupPermissions['user'][$action] ) && $wgGroupPermissions['user'][$action] )
2080                         || ( isset( $wgGroupPermissions['autoconfirmed'][$action] ) && $wgGroupPermissions['autoconfirmed'][$action] ) )
2081                 ) {
2082                         $displayReturnto = null;
2083
2084                         # Due to bug 32276, if a user does not have read permissions,
2085                         # $this->getTitle() will just give Special:Badtitle, which is
2086                         # not especially useful as a returnto parameter. Use the title
2087                         # from the request instead, if there was one.
2088                         $request = $this->getRequest();
2089                         $returnto = Title::newFromURL( $request->getVal( 'title', '' ) );
2090                         if ( $action == 'edit' ) {
2091                                 $msg = 'whitelistedittext';
2092                                 $displayReturnto = $returnto;
2093                         } elseif ( $action == 'createpage' || $action == 'createtalk' ) {
2094                                 $msg = 'nocreatetext';
2095                         } elseif ( $action == 'upload' ) {
2096                                 $msg = 'uploadnologintext';
2097                         } else { # Read
2098                                 $msg = 'loginreqpagetext';
2099                                 $displayReturnto = Title::newMainPage();
2100                         }
2101
2102                         $query = array();
2103
2104                         if ( $returnto ) {
2105                                 $query['returnto'] = $returnto->getPrefixedText();
2106
2107                                 if ( !$request->wasPosted() ) {
2108                                         $returntoquery = $request->getValues();
2109                                         unset( $returntoquery['title'] );
2110                                         unset( $returntoquery['returnto'] );
2111                                         unset( $returntoquery['returntoquery'] );
2112                                         $query['returntoquery'] = wfArrayToCGI( $returntoquery );
2113                                 }
2114                         }
2115                         $loginLink = Linker::linkKnown(
2116                                 SpecialPage::getTitleFor( 'Userlogin' ),
2117                                 $this->msg( 'loginreqlink' )->escaped(),
2118                                 array(),
2119                                 $query
2120                         );
2121
2122                         $this->prepareErrorPage( $this->msg( 'loginreqtitle' ) );
2123                         $this->addHTML( $this->msg( $msg )->rawParams( $loginLink )->parse() );
2124
2125                         # Don't return to a page the user can't read otherwise
2126                         # we'll end up in a pointless loop
2127                         if ( $displayReturnto && $displayReturnto->userCan( 'read', $this->getUser() ) ) {
2128                                 $this->returnToMain( null, $displayReturnto );
2129                         }
2130                 } else {
2131                         $this->prepareErrorPage( $this->msg( 'permissionserrors' ) );
2132                         $this->addWikiText( $this->formatPermissionsErrorMessage( $errors, $action ) );
2133                 }
2134         }
2135
2136         /**
2137          * Display an error page indicating that a given version of MediaWiki is
2138          * required to use it
2139          *
2140          * @param $version Mixed: the version of MediaWiki needed to use the page
2141          */
2142         public function versionRequired( $version ) {
2143                 $this->prepareErrorPage( $this->msg( 'versionrequired', $version ) );
2144
2145                 $this->addWikiMsg( 'versionrequiredtext', $version );
2146                 $this->returnToMain();
2147         }
2148
2149         /**
2150          * Display an error page noting that a given permission bit is required.
2151          * @deprecated since 1.18, just throw the exception directly
2152          * @param $permission String: key required
2153          */
2154         public function permissionRequired( $permission ) {
2155                 throw new PermissionsError( $permission );
2156         }
2157
2158         /**
2159          * Produce the stock "please login to use the wiki" page
2160          *
2161          * @deprecated in 1.19; throw the exception directly
2162          */
2163         public function loginToUse() {
2164                 throw new PermissionsError( 'read' );
2165         }
2166
2167         /**
2168          * Format a list of error messages
2169          *
2170          * @param $errors Array of arrays returned by Title::getUserPermissionsErrors
2171          * @param $action String: action that was denied or null if unknown
2172          * @return String: the wikitext error-messages, formatted into a list.
2173          */
2174         public function formatPermissionsErrorMessage( $errors, $action = null ) {
2175                 if ( $action == null ) {
2176                         $text = $this->msg( 'permissionserrorstext', count( $errors ) )->plain() . "\n\n";
2177                 } else {
2178                         $action_desc = $this->msg( "action-$action" )->plain();
2179                         $text = $this->msg(
2180                                 'permissionserrorstext-withaction',
2181                                 count( $errors ),
2182                                 $action_desc
2183                         )->plain() . "\n\n";
2184                 }
2185
2186                 if ( count( $errors ) > 1 ) {
2187                         $text .= '<ul class="permissions-errors">' . "\n";
2188
2189                         foreach( $errors as $error ) {
2190                                 $text .= '<li>';
2191                                 $text .= call_user_func_array( array( $this, 'msg' ), $error )->plain();
2192                                 $text .= "</li>\n";
2193                         }
2194                         $text .= '</ul>';
2195                 } else {
2196                         $text .= "<div class=\"permissions-errors\">\n" .
2197                                         call_user_func_array( array( $this, 'msg' ), reset( $errors ) )->plain() .
2198                                         "\n</div>";
2199                 }
2200
2201                 return $text;
2202         }
2203
2204         /**
2205          * Display a page stating that the Wiki is in read-only mode,
2206          * and optionally show the source of the page that the user
2207          * was trying to edit.  Should only be called (for this
2208          * purpose) after wfReadOnly() has returned true.
2209          *
2210          * For historical reasons, this function is _also_ used to
2211          * show the error message when a user tries to edit a page
2212          * they are not allowed to edit.  (Unless it's because they're
2213          * blocked, then we show blockedPage() instead.)  In this
2214          * case, the second parameter should be set to true and a list
2215          * of reasons supplied as the third parameter.
2216          *
2217          * @todo Needs to be split into multiple functions.
2218          *
2219          * @param $source    String: source code to show (or null).
2220          * @param $protected Boolean: is this a permissions error?
2221          * @param $reasons   Array: list of reasons for this error, as returned by Title::getUserPermissionsErrors().
2222          * @param $action    String: action that was denied or null if unknown
2223          */
2224         public function readOnlyPage( $source = null, $protected = false, $reasons = array(), $action = null ) {
2225                 $this->setRobotPolicy( 'noindex,nofollow' );
2226                 $this->setArticleRelated( false );
2227
2228                 // If no reason is given, just supply a default "I can't let you do
2229                 // that, Dave" message.  Should only occur if called by legacy code.
2230                 if ( $protected && empty( $reasons ) ) {
2231                         $reasons[] = array( 'badaccess-group0' );
2232                 }
2233
2234                 if ( !empty( $reasons ) ) {
2235                         // Permissions error
2236                         if( $source ) {
2237                                 $this->setPageTitle( $this->msg( 'viewsource-title', $this->getTitle()->getPrefixedText() ) );
2238                                 $this->addBacklinkSubtitle( $this->getTitle() );
2239                         } else {
2240                                 $this->setPageTitle( $this->msg( 'badaccess' ) );
2241                         }
2242                         $this->addWikiText( $this->formatPermissionsErrorMessage( $reasons, $action ) );
2243                 } else {
2244                         // Wiki is read only
2245                         throw new ReadOnlyError;
2246                 }
2247
2248                 // Show source, if supplied
2249                 if( is_string( $source ) ) {
2250                         $this->addWikiMsg( 'viewsourcetext' );
2251
2252                         $pageLang = $this->getTitle()->getPageLanguage();
2253                         $params = array(
2254                                 'id'   => 'wpTextbox1',
2255                                 'name' => 'wpTextbox1',
2256                                 'cols' => $this->getUser()->getOption( 'cols' ),
2257                                 'rows' => $this->getUser()->getOption( 'rows' ),
2258                                 'readonly' => 'readonly',
2259                                 'lang' => $pageLang->getHtmlCode(),
2260                                 'dir' => $pageLang->getDir(),
2261                         );
2262                         $this->addHTML( Html::element( 'textarea', $params, $source ) );
2263
2264                         // Show templates used by this article
2265                         $templates = Linker::formatTemplates( $this->getTitle()->getTemplateLinksFrom() );
2266                         $this->addHTML( "<div class='templatesUsed'>
2267 $templates
2268 </div>
2269 " );
2270                 }
2271
2272                 # If the title doesn't exist, it's fairly pointless to print a return
2273                 # link to it.  After all, you just tried editing it and couldn't, so
2274                 # what's there to do there?
2275                 if( $this->getTitle()->exists() ) {
2276                         $this->returnToMain( null, $this->getTitle() );
2277                 }
2278         }
2279
2280         /**
2281          * Turn off regular page output and return an error reponse
2282          * for when rate limiting has triggered.
2283          */
2284         public function rateLimited() {
2285                 throw new ThrottledError;
2286         }
2287
2288         /**
2289          * Show a warning about slave lag
2290          *
2291          * If the lag is higher than $wgSlaveLagCritical seconds,
2292          * then the warning is a bit more obvious. If the lag is
2293          * lower than $wgSlaveLagWarning, then no warning is shown.
2294          *
2295          * @param $lag Integer: slave lag
2296          */
2297         public function showLagWarning( $lag ) {
2298                 global $wgSlaveLagWarning, $wgSlaveLagCritical;
2299                 if( $lag >= $wgSlaveLagWarning ) {
2300                         $message = $lag < $wgSlaveLagCritical
2301                                 ? 'lag-warn-normal'
2302                                 : 'lag-warn-high';
2303                         $wrap = Html::rawElement( 'div', array( 'class' => "mw-{$message}" ), "\n$1\n" );
2304                         $this->wrapWikiMsg( "$wrap\n", array( $message, $this->getLanguage()->formatNum( $lag ) ) );
2305                 }
2306         }
2307
2308         public function showFatalError( $message ) {
2309                 $this->prepareErrorPage( $this->msg( 'internalerror' ) );
2310
2311                 $this->addHTML( $message );
2312         }
2313
2314         public function showUnexpectedValueError( $name, $val ) {
2315                 $this->showFatalError( $this->msg( 'unexpected', $name, $val )->text() );
2316         }
2317
2318         public function showFileCopyError( $old, $new ) {
2319                 $this->showFatalError( $this->msg( 'filecopyerror', $old, $new )->text() );
2320         }
2321
2322         public function showFileRenameError( $old, $new ) {
2323                 $this->showFatalError( $this->msg( 'filerenameerror', $old, $new )->text() );
2324         }
2325
2326         public function showFileDeleteError( $name ) {
2327                 $this->showFatalError( $this->msg( 'filedeleteerror', $name )->text() );
2328         }
2329
2330         public function showFileNotFoundError( $name ) {
2331                 $this->showFatalError( $this->msg( 'filenotfound', $name )->text() );
2332         }
2333
2334         /**
2335          * Add a "return to" link pointing to a specified title
2336          *
2337          * @param $title Title to link
2338          * @param $query String query string
2339          * @param $text String text of the link (input is not escaped)
2340          */
2341         public function addReturnTo( $title, $query = array(), $text = null ) {
2342                 $this->addLink( array( 'rel' => 'next', 'href' => $title->getFullURL() ) );
2343                 $link = $this->msg( 'returnto' )->rawParams(
2344                         Linker::link( $title, $text, array(), $query ) )->escaped();
2345                 $this->addHTML( "<p id=\"mw-returnto\">{$link}</p>\n" );
2346         }
2347
2348         /**
2349          * Add a "return to" link pointing to a specified title,
2350          * or the title indicated in the request, or else the main page
2351          *
2352          * @param $unused
2353          * @param $returnto Title or String to return to
2354          * @param $returntoquery String: query string for the return to link
2355          */
2356         public function returnToMain( $unused = null, $returnto = null, $returntoquery = null ) {
2357                 if ( $returnto == null ) {
2358                         $returnto = $this->getRequest()->getText( 'returnto' );
2359                 }
2360
2361                 if ( $returntoquery == null ) {
2362                         $returntoquery = $this->getRequest()->getText( 'returntoquery' );
2363                 }
2364
2365                 if ( $returnto === '' ) {
2366                         $returnto = Title::newMainPage();
2367                 }
2368
2369                 if ( is_object( $returnto ) ) {
2370                         $titleObj = $returnto;
2371                 } else {
2372                         $titleObj = Title::newFromText( $returnto );
2373                 }
2374                 if ( !is_object( $titleObj ) ) {
2375                         $titleObj = Title::newMainPage();
2376                 }
2377
2378                 $this->addReturnTo( $titleObj, $returntoquery );
2379         }
2380
2381         /**
2382          * @param $sk Skin The given Skin
2383          * @param $includeStyle Boolean: unused
2384          * @return String: The doctype, opening <html>, and head element.
2385          */
2386         public function headElement( Skin $sk, $includeStyle = true ) {
2387                 global $wgContLang;
2388
2389                 $userdir = $this->getLanguage()->getDir();
2390                 $sitedir = $wgContLang->getDir();
2391
2392                 if ( $sk->commonPrintStylesheet() ) {
2393                         $this->addModuleStyles( 'mediawiki.legacy.wikiprintable' );
2394                 }
2395
2396                 $ret = Html::htmlHeader( array( 'lang' => $this->getLanguage()->getHtmlCode(), 'dir' => $userdir, 'class' => 'client-nojs' ) );
2397
2398                 if ( $this->getHTMLTitle() == '' ) {
2399                         $this->setHTMLTitle( $this->msg( 'pagetitle', $this->getPageTitle() ) );
2400                 }
2401
2402                 $openHead = Html::openElement( 'head' );
2403                 if ( $openHead ) {
2404                         # Don't bother with the newline if $head == ''
2405                         $ret .= "$openHead\n";
2406                 }
2407
2408                 $ret .= Html::element( 'title', null, $this->getHTMLTitle() ) . "\n";
2409
2410                 $ret .= implode( "\n", array(
2411                         $this->getHeadLinks( null, true ),
2412                         $this->buildCssLinks(),
2413                         $this->getHeadScripts(),
2414                         $this->getHeadItems()
2415                 ) );
2416
2417                 $closeHead = Html::closeElement( 'head' );
2418                 if ( $closeHead ) {
2419                         $ret .= "$closeHead\n";
2420                 }
2421
2422                 $bodyAttrs = array();
2423
2424                 # Classes for LTR/RTL directionality support
2425                 $bodyAttrs['class'] = "mediawiki $userdir sitedir-$sitedir";
2426
2427                 if ( $this->getLanguage()->capitalizeAllNouns() ) {
2428                         # A <body> class is probably not the best way to do this . . .
2429                         $bodyAttrs['class'] .= ' capitalize-all-nouns';
2430                 }
2431                 $bodyAttrs['class'] .= ' ' . $sk->getPageClasses( $this->getTitle() );
2432                 $bodyAttrs['class'] .= ' skin-' . Sanitizer::escapeClass( $sk->getSkinName() );
2433                 $bodyAttrs['class'] .= ' action-' . Sanitizer::escapeClass( Action::getActionName( $this->getContext() ) );
2434
2435                 $sk->addToBodyAttributes( $this, $bodyAttrs ); // Allow skins to add body attributes they need
2436                 wfRunHooks( 'OutputPageBodyAttributes', array( $this, $sk, &$bodyAttrs ) );
2437
2438                 $ret .= Html::openElement( 'body', $bodyAttrs ) . "\n";
2439
2440                 return $ret;
2441         }
2442
2443         /**
2444          * Add the default ResourceLoader modules to this object
2445          */
2446         private function addDefaultModules() {
2447                 global $wgIncludeLegacyJavaScript, $wgPreloadJavaScriptMwUtil, $wgUseAjax,
2448                         $wgAjaxWatch, $wgEnableMWSuggest;
2449
2450                 // Add base resources
2451                 $this->addModules( array(
2452                         'mediawiki.user',
2453                         'mediawiki.page.startup',
2454                         'mediawiki.page.ready',
2455                 ) );
2456                 if ( $wgIncludeLegacyJavaScript ){
2457                         $this->addModules( 'mediawiki.legacy.wikibits' );
2458                 }
2459
2460                 if ( $wgPreloadJavaScriptMwUtil ) {
2461                         $this->addModules( 'mediawiki.util' );
2462                 }
2463
2464                 MWDebug::addModules( $this );
2465
2466                 // Add various resources if required
2467                 if ( $wgUseAjax ) {
2468                         $this->addModules( 'mediawiki.legacy.ajax' );
2469
2470                         wfRunHooks( 'AjaxAddScript', array( &$this ) );
2471
2472                         if( $wgAjaxWatch && $this->getUser()->isLoggedIn() ) {
2473                                 $this->addModules( 'mediawiki.action.watch.ajax' );
2474                         }
2475
2476                         if ( $wgEnableMWSuggest && !$this->getUser()->getOption( 'disablesuggest', false ) ) {
2477                                 $this->addModules( 'mediawiki.legacy.mwsuggest' );
2478                         }
2479                 }
2480
2481                 if ( $this->getUser()->getBoolOption( 'editsectiononrightclick' ) ) {
2482                         $this->addModules( 'mediawiki.action.view.rightClickEdit' );
2483                 }
2484
2485                 # Crazy edit-on-double-click stuff
2486                 if ( $this->isArticle() && $this->getUser()->getOption( 'editondblclick' ) ) {
2487                         $this->addModules( 'mediawiki.action.view.dblClickEdit' );
2488                 }
2489         }
2490
2491         /**
2492          * Get a ResourceLoader object associated with this OutputPage
2493          *
2494          * @return ResourceLoader
2495          */
2496         public function getResourceLoader() {
2497                 if ( is_null( $this->mResourceLoader ) ) {
2498                         $this->mResourceLoader = new ResourceLoader();
2499                 }
2500                 return $this->mResourceLoader;
2501         }
2502
2503         /**
2504          * TODO: Document
2505          * @param $modules Array/string with the module name(s)
2506          * @param $only String ResourceLoaderModule TYPE_ class constant
2507          * @param $useESI boolean
2508          * @param $extraQuery Array with extra query parameters to add to each request. array( param => value )
2509          * @param $loadCall boolean If true, output an (asynchronous) mw.loader.load() call rather than a <script src="..."> tag
2510          * @return string html <script> and <style> tags
2511          */
2512         protected function makeResourceLoaderLink( $modules, $only, $useESI = false, array $extraQuery = array(), $loadCall = false ) {
2513                 global $wgResourceLoaderUseESI;
2514
2515                 if ( !count( $modules ) ) {
2516                         return '';
2517                 }
2518
2519                 if ( count( $modules ) > 1 ) {
2520                         // Remove duplicate module requests
2521                         $modules = array_unique( (array) $modules );
2522                         // Sort module names so requests are more uniform
2523                         sort( $modules );
2524
2525                         if ( ResourceLoader::inDebugMode() ) {
2526                                 // Recursively call us for every item
2527                                 $links = '';
2528                                 foreach ( $modules as $name ) {
2529                                         $links .= $this->makeResourceLoaderLink( $name, $only, $useESI );
2530                                 }
2531                                 return $links;
2532                         }
2533                 }
2534
2535                 // Create keyed-by-group list of module objects from modules list
2536                 $groups = array();
2537                 $resourceLoader = $this->getResourceLoader();
2538                 foreach ( (array) $modules as $name ) {
2539                         $module = $resourceLoader->getModule( $name );
2540                         # Check that we're allowed to include this module on this page
2541                         if ( !$module
2542                                 || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_SCRIPTS )
2543                                         && $only == ResourceLoaderModule::TYPE_SCRIPTS )
2544                                 || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_STYLES )
2545                                         && $only == ResourceLoaderModule::TYPE_STYLES )
2546                                 )
2547                         {
2548                                 continue;
2549                         }
2550
2551                         $group = $module->getGroup();
2552                         if ( !isset( $groups[$group] ) ) {
2553                                 $groups[$group] = array();
2554                         }
2555                         $groups[$group][$name] = $module;
2556                 }
2557
2558                 $links = '';
2559                 foreach ( $groups as $group => $modules ) {
2560                         // Special handling for user-specific groups
2561                         $user = null;
2562                         if ( ( $group === 'user' || $group === 'private' ) && $this->getUser()->isLoggedIn() ) {
2563                                 $user = $this->getUser()->getName();
2564                         }
2565
2566                         // Create a fake request based on the one we are about to make so modules return
2567                         // correct timestamp and emptiness data
2568                         $query = ResourceLoader::makeLoaderQuery(
2569                                 array(), // modules; not determined yet
2570                                 $this->getLanguage()->getCode(),
2571                                 $this->getSkin()->getSkinName(),
2572                                 $user,
2573                                 null, // version; not determined yet
2574                                 ResourceLoader::inDebugMode(),
2575                                 $only === ResourceLoaderModule::TYPE_COMBINED ? null : $only,
2576                                 $this->isPrintable(),
2577                                 $this->getRequest()->getBool( 'handheld' ),
2578                                 $extraQuery
2579                         );
2580                         $context = new ResourceLoaderContext( $resourceLoader, new FauxRequest( $query ) );
2581                         // Extract modules that know they're empty
2582                         $emptyModules = array ();
2583                         foreach ( $modules as $key => $module ) {
2584                                 if ( $module->isKnownEmpty( $context ) ) {
2585                                         $emptyModules[$key] = 'ready';
2586                                         unset( $modules[$key] );
2587                                 }
2588                         }
2589                         // Inline empty modules: since they're empty, just mark them as 'ready'
2590                         if ( count( $emptyModules ) > 0 && $only !== ResourceLoaderModule::TYPE_STYLES ) {
2591                                 // If we're only getting the styles, we don't need to do anything for empty modules.
2592                                 $links .= Html::inlineScript(
2593
2594                                                 ResourceLoader::makeLoaderConditionalScript(
2595
2596                                                                 ResourceLoader::makeLoaderStateScript( $emptyModules )
2597
2598                                                 )
2599
2600                                 ) . "\n";
2601                         }
2602
2603                         // If there are no modules left, skip this group
2604                         if ( $modules === array() ) {
2605                                 continue;
2606                         }
2607
2608                         // Inline private modules. These can't be loaded through load.php for security
2609                         // reasons, see bug 34907. Note that these modules should be loaded from
2610                         // getHeadScripts() before the first loader call. Otherwise other modules can't
2611                         // properly use them as dependencies (bug 30914)
2612                         if ( $group === 'private' ) {
2613                                 if ( $only == ResourceLoaderModule::TYPE_STYLES ) {
2614                                         $links .= Html::inlineStyle(
2615                                                 $resourceLoader->makeModuleResponse( $context, $modules )
2616                                         );
2617                                 } else {
2618                                         $links .= Html::inlineScript(
2619                                                 ResourceLoader::makeLoaderConditionalScript(
2620                                                         $resourceLoader->makeModuleResponse( $context, $modules )
2621                                                 )
2622                                         );
2623                                 }
2624                                 $links .= "\n";
2625                                 continue;
2626                         }
2627                         // Special handling for the user group; because users might change their stuff
2628                         // on-wiki like user pages, or user preferences; we need to find the highest
2629                         // timestamp of these user-changable modules so we can ensure cache misses on change
2630                         // This should NOT be done for the site group (bug 27564) because anons get that too
2631                         // and we shouldn't be putting timestamps in Squid-cached HTML
2632                         $version = null;
2633                         if ( $group === 'user' ) {
2634                                 // Get the maximum timestamp
2635                                 $timestamp = 1;
2636                                 foreach ( $modules as $module ) {
2637                                         $timestamp = max( $timestamp, $module->getModifiedTime( $context ) );
2638                                 }
2639                                 // Add a version parameter so cache will break when things change
2640                                 $version = wfTimestamp( TS_ISO_8601_BASIC, $timestamp );
2641                         }
2642
2643                         $url = ResourceLoader::makeLoaderURL(
2644                                 array_keys( $modules ),
2645                                 $this->getLanguage()->getCode(),
2646                                 $this->getSkin()->getSkinName(),
2647                                 $user,
2648                                 $version,
2649                                 ResourceLoader::inDebugMode(),
2650                                 $only === ResourceLoaderModule::TYPE_COMBINED ? null : $only,
2651                                 $this->isPrintable(),
2652                                 $this->getRequest()->getBool( 'handheld' ),
2653                                 $extraQuery
2654                         );
2655                         if ( $useESI && $wgResourceLoaderUseESI ) {
2656                                 $esi = Xml::element( 'esi:include', array( 'src' => $url ) );
2657                                 if ( $only == ResourceLoaderModule::TYPE_STYLES ) {
2658                                         $link = Html::inlineStyle( $esi );
2659                                 } else {
2660                                         $link = Html::inlineScript( $esi );
2661                                 }
2662                         } else {
2663                                 // Automatically select style/script elements
2664                                 if ( $only === ResourceLoaderModule::TYPE_STYLES ) {
2665                                         $link = Html::linkedStyle( $url );
2666                                 } else if ( $loadCall ) {
2667                                         $link = Html::inlineScript(
2668                                                 ResourceLoader::makeLoaderConditionalScript(
2669                                                         Xml::encodeJsCall( 'mw.loader.load', array( $url, 'text/javascript', true ) )
2670                                                 )
2671                                         );
2672                                 } else {
2673                                         $link = Html::linkedScript( $url );
2674                                 }
2675                         }
2676
2677                         if( $group == 'noscript' ){
2678                                 $links .= Html::rawElement( 'noscript', array(), $link ) . "\n";
2679                         } else {
2680                                 $links .= $link . "\n";
2681                         }
2682                 }
2683                 return $links;
2684         }
2685
2686         /**
2687          * JS stuff to put in the <head>. This is the startup module, config
2688          * vars and modules marked with position 'top'
2689          *
2690          * @return String: HTML fragment
2691          */
2692         function getHeadScripts() {
2693                 global $wgResourceLoaderExperimentalAsyncLoading;
2694
2695                 // Startup - this will immediately load jquery and mediawiki modules
2696                 $scripts = $this->makeResourceLoaderLink( 'startup', ResourceLoaderModule::TYPE_SCRIPTS, true );
2697
2698                 // Load config before anything else
2699                 $scripts .= Html::inlineScript(
2700                         ResourceLoader::makeLoaderConditionalScript(
2701                                 ResourceLoader::makeConfigSetScript( $this->getJSVars() )
2702                         )
2703                 );
2704
2705                 // Load embeddable private modules before any loader links
2706                 // This needs to be TYPE_COMBINED so these modules are properly wrapped
2707                 // in mw.loader.implement() calls and deferred until mw.user is available
2708                 $embedScripts = array( 'user.options', 'user.tokens' );
2709                 $scripts .= $this->makeResourceLoaderLink( $embedScripts, ResourceLoaderModule::TYPE_COMBINED );
2710
2711                 // Script and Messages "only" requests marked for top inclusion
2712                 // Messages should go first
2713                 $scripts .= $this->makeResourceLoaderLink( $this->getModuleMessages( true, 'top' ), ResourceLoaderModule::TYPE_MESSAGES );
2714                 $scripts .= $this->makeResourceLoaderLink( $this->getModuleScripts( true, 'top' ), ResourceLoaderModule::TYPE_SCRIPTS );
2715
2716                 // Modules requests - let the client calculate dependencies and batch requests as it likes
2717                 // Only load modules that have marked themselves for loading at the top
2718                 $modules = $this->getModules( true, 'top' );
2719                 if ( $modules ) {
2720                         $scripts .= Html::inlineScript(
2721                                 ResourceLoader::makeLoaderConditionalScript(
2722                                         Xml::encodeJsCall( 'mw.loader.load', array( $modules ) )
2723                                 )
2724                         );
2725                 }
2726
2727                 if ( $wgResourceLoaderExperimentalAsyncLoading ) {
2728                         $scripts .= $this->getScriptsForBottomQueue( true );
2729                 }
2730
2731                 return $scripts;
2732         }
2733
2734         /**
2735          * JS stuff to put at the 'bottom', which can either be the bottom of the <body>
2736          * or the bottom of the <head> depending on $wgResourceLoaderExperimentalAsyncLoading:
2737          * modules marked with position 'bottom', legacy scripts ($this->mScripts),
2738          * user preferences, site JS and user JS
2739          *
2740          * @param $inHead boolean If true, this HTML goes into the <head>, if false it goes into the <body>
2741          * @return string
2742          */
2743         function getScriptsForBottomQueue( $inHead ) {
2744                 global $wgUseSiteJs, $wgAllowUserJs;
2745
2746                 // Script and Messages "only" requests marked for bottom inclusion
2747                 // If we're in the <head>, use load() calls rather than <script src="..."> tags
2748                 // Messages should go first
2749                 $scripts = $this->makeResourceLoaderLink( $this->getModuleMessages( true, 'bottom' ),
2750                         ResourceLoaderModule::TYPE_MESSAGES, /* $useESI = */ false, /* $extraQuery = */ array(),
2751                         /* $loadCall = */ $inHead
2752                 );
2753                 $scripts .= $this->makeResourceLoaderLink( $this->getModuleScripts( true, 'bottom' ),
2754                         ResourceLoaderModule::TYPE_SCRIPTS, /* $useESI = */ false, /* $extraQuery = */ array(),
2755                         /* $loadCall = */ $inHead
2756                 );
2757
2758                 // Modules requests - let the client calculate dependencies and batch requests as it likes
2759                 // Only load modules that have marked themselves for loading at the bottom
2760                 $modules = $this->getModules( true, 'bottom' );
2761                 if ( $modules ) {
2762                         $scripts .= Html::inlineScript(
2763                                 ResourceLoader::makeLoaderConditionalScript(
2764                                         Xml::encodeJsCall( 'mw.loader.load', array( $modules, null, true ) )
2765                                 )
2766                         );
2767                 }
2768
2769                 // Legacy Scripts
2770                 $scripts .= "\n" . $this->mScripts;
2771
2772                 $defaultModules = array();
2773
2774                 // Add site JS if enabled
2775                 if ( $wgUseSiteJs ) {
2776                         $scripts .= $this->makeResourceLoaderLink( 'site', ResourceLoaderModule::TYPE_SCRIPTS,
2777                                 /* $useESI = */ false, /* $extraQuery = */ array(), /* $loadCall = */ $inHead
2778                         );
2779                         $defaultModules['site'] = 'loading';
2780                 } else {
2781                         // The wiki is configured to not allow a site module.
2782                         $defaultModules['site'] = 'missing';
2783                 }
2784
2785                 // Add user JS if enabled
2786                 if ( $wgAllowUserJs ) {
2787                         if ( $this->getUser()->isLoggedIn() ) {
2788                                 if( $this->getTitle() && $this->getTitle()->isJsSubpage() && $this->userCanPreview() ) {
2789                                         # XXX: additional security check/prompt?
2790                                         // We're on a preview of a JS subpage
2791                                         // Exclude this page from the user module in case it's in there (bug 26283)
2792                                         $scripts .= $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_SCRIPTS, false,
2793                                                 array( 'excludepage' => $this->getTitle()->getPrefixedDBkey() ), $inHead
2794                                         );
2795                                         // Load the previewed JS
2796                                         $scripts .= Html::inlineScript( "\n" . $this->getRequest()->getText( 'wpTextbox1' ) . "\n" ) . "\n";
2797                                         // FIXME: If the user is previewing, say, ./vector.js, his ./common.js will be loaded
2798                                         // asynchronously and may arrive *after* the inline script here. So the previewed code
2799                                         // may execute before ./common.js runs. Normally, ./common.js runs before ./vector.js...
2800                                 } else {
2801                                         // Include the user module normally, i.e., raw to avoid it being wrapped in a closure.
2802                                         $scripts .= $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_SCRIPTS,
2803                                                 /* $useESI = */ false, /* $extraQuery = */ array(), /* $loadCall = */ $inHead
2804                                         );
2805                                 }
2806                                 $defaultModules['user'] = 'loading';
2807                         } else {
2808                                 // Non-logged-in users have no user module. Treat it as empty and 'ready' to avoid
2809                                 // blocking default gadgets that might depend on it. Although arguably default-enabled
2810                                 // gadgets should not depend on the user module, it's harmless and less error-prone to
2811                                 // handle this case.
2812                                 $defaultModules['user'] = 'ready';
2813                         }
2814                 } else {
2815                         // User JS disabled
2816                         $defaultModules['user'] = 'missing';
2817                 }
2818
2819                 // Group JS is only enabled if site JS is enabled.
2820                 if ( $wgUseSiteJs ) {
2821                         if ( $this->getUser()->isLoggedIn() ) {
2822                                 $scripts .= $this->makeResourceLoaderLink( 'user.groups', ResourceLoaderModule::TYPE_COMBINED,
2823                                         /* $useESI = */ false, /* $extraQuery = */ array(), /* $loadCall = */ $inHead
2824                                 );
2825                                 $defaultModules['user.groups'] = 'loading';
2826                         } else {
2827                                 // Non-logged-in users have no user.groups module. Treat it as empty and 'ready' to
2828                                 // avoid blocking gadgets that might depend upon the module.
2829                                 $defaultModules['user.groups'] = 'ready';
2830                         }
2831                 } else {
2832                         // Site (and group JS) disabled
2833                         $defaultModules['user.groups'] = 'missing';
2834                 }
2835
2836                 $loaderInit = '';
2837                 if ( $inHead ) {
2838                         // We generate loader calls anyway, so no need to fix the client-side loader's state to 'loading'.
2839                         foreach ( $defaultModules as $m => $state ) {
2840                                 if ( $state == 'loading' ) {
2841                                         unset( $defaultModules[$m] );
2842                                 }
2843                         }
2844                 }
2845                 if ( count( $defaultModules ) > 0 ) {
2846                         $loaderInit = Html::inlineScript(
2847                                 ResourceLoader::makeLoaderConditionalScript(
2848                                         ResourceLoader::makeLoaderStateScript( $defaultModules )
2849                                 )
2850                         ) . "\n";
2851                 }
2852                 return $loaderInit . $scripts;
2853         }
2854
2855         /**
2856          * JS stuff to put at the bottom of the <body>
2857          * @return string
2858          */
2859         function getBottomScripts() {
2860                 global $wgResourceLoaderExperimentalAsyncLoading;
2861                 if ( !$wgResourceLoaderExperimentalAsyncLoading ) {
2862                         return $this->getScriptsForBottomQueue( false );
2863                 } else {
2864                         return '';
2865                 }
2866         }
2867
2868         /**
2869          * Add one or more variables to be set in mw.config in JavaScript.
2870          *
2871          * @param $key {String|Array} Key or array of key/value pars.
2872          * @param $value {Mixed} [optional] Value of the configuration variable.
2873          */
2874         public function addJsConfigVars( $keys, $value = null ) {
2875                 if ( is_array( $keys ) ) {
2876                         foreach ( $keys as $key => $value ) {
2877                                 $this->mJsConfigVars[$key] = $value;
2878                         }
2879                         return;
2880                 }
2881
2882                 $this->mJsConfigVars[$keys] = $value;
2883         }
2884
2885
2886         /**
2887          * Get an array containing the variables to be set in mw.config in JavaScript.
2888          *
2889          * DO NOT CALL THIS FROM OUTSIDE OF THIS CLASS OR Skin::makeGlobalVariablesScript().
2890          * This is only public until that function is removed. You have been warned.
2891          *
2892          * Do not add things here which can be evaluated in ResourceLoaderStartupScript
2893          * - in other words, page-independent/site-wide variables (without state).
2894          * You will only be adding bloat to the html page and causing page caches to
2895          * have to be purged on configuration changes.
2896          * @return array
2897          */
2898         public function getJSVars() {
2899                 global $wgUseAjax, $wgEnableMWSuggest, $wgContLang;
2900
2901                 $latestRevID = 0;
2902                 $pageID = 0;
2903                 $canonicalName = false; # bug 21115
2904
2905                 $title = $this->getTitle();
2906                 $ns = $title->getNamespace();
2907                 $nsname = MWNamespace::exists( $ns ) ? MWNamespace::getCanonicalName( $ns ) : $title->getNsText();
2908
2909                 // Get the relevant title so that AJAX features can use the correct page name
2910                 // when making API requests from certain special pages (bug 34972).
2911                 $relevantTitle = $this->getSkin()->getRelevantTitle();
2912
2913                 if ( $ns == NS_SPECIAL ) {
2914                         list( $canonicalName, /*...*/ ) = SpecialPageFactory::resolveAlias( $title->getDBkey() );
2915                 } elseif ( $this->canUseWikiPage() ) {
2916                         $wikiPage = $this->getWikiPage();
2917                         $latestRevID = $wikiPage->getLatest();
2918                         $pageID = $wikiPage->getId();
2919                 }
2920
2921                 $lang = $title->getPageLanguage();
2922
2923                 // Pre-process information
2924                 $separatorTransTable = $lang->separatorTransformTable();
2925                 $separatorTransTable = $separatorTransTable ? $separatorTransTable : array();
2926                 $compactSeparatorTransTable = array(
2927                         implode( "\t", array_keys( $separatorTransTable ) ),
2928                         implode( "\t", $separatorTransTable ),
2929                 );
2930                 $digitTransTable = $lang->digitTransformTable();
2931                 $digitTransTable = $digitTransTable ? $digitTransTable : array();
2932                 $compactDigitTransTable = array(
2933                         implode( "\t", array_keys( $digitTransTable ) ),
2934                         implode( "\t", $digitTransTable ),
2935                 );
2936
2937                 $vars = array(
2938                         'wgCanonicalNamespace' => $nsname,
2939                         'wgCanonicalSpecialPageName' => $canonicalName,
2940                         'wgNamespaceNumber' => $title->getNamespace(),
2941                         'wgPageName' => $title->getPrefixedDBKey(),
2942                         'wgTitle' => $title->getText(),
2943                         'wgCurRevisionId' => $latestRevID,
2944                         'wgArticleId' => $pageID,
2945                         'wgIsArticle' => $this->isArticle(),
2946                         'wgAction' => Action::getActionName( $this->getContext() ),
2947                         'wgUserName' => $this->getUser()->isAnon() ? null : $this->getUser()->getName(),
2948                         'wgUserGroups' => $this->getUser()->getEffectiveGroups(),
2949                         'wgCategories' => $this->getCategories(),
2950                         'wgBreakFrames' => $this->getFrameOptions() == 'DENY',
2951                         'wgPageContentLanguage' => $lang->getCode(),
2952                         'wgSeparatorTransformTable' => $compactSeparatorTransTable,
2953                         'wgDigitTransformTable' => $compactDigitTransTable,
2954                         'wgRelevantPageName' => $relevantTitle->getPrefixedDBKey(),
2955                 );
2956                 if ( $wgContLang->hasVariants() ) {
2957                         $vars['wgUserVariant'] = $wgContLang->getPreferredVariant();
2958                 }
2959                 foreach ( $title->getRestrictionTypes() as $type ) {
2960                         $vars['wgRestriction' . ucfirst( $type )] = $title->getRestrictions( $type );
2961                 }
2962                 if ( $wgUseAjax && $wgEnableMWSuggest && !$this->getUser()->getOption( 'disablesuggest', false ) ) {
2963                         $vars['wgSearchNamespaces'] = SearchEngine::userNamespaces( $this->getUser() );
2964                 }
2965                 if ( $title->isMainPage() ) {
2966                         $vars['wgIsMainPage'] = true;
2967                 }
2968                 if ( $this->mRedirectedFrom ) {
2969                         $vars['wgRedirectedFrom'] = $this->mRedirectedFrom->getPrefixedDBKey();
2970                 }
2971
2972                 // Allow extensions to add their custom variables to the mw.config map.
2973                 // Use the 'ResourceLoaderGetConfigVars' hook if the variable is not
2974                 // page-dependant but site-wide (without state).
2975                 // Alternatively, you may want to use OutputPage->addJsConfigVars() instead.
2976                 wfRunHooks( 'MakeGlobalVariablesScript', array( &$vars, $this ) );
2977
2978                 // Merge in variables from addJsConfigVars last
2979                 return array_merge( $vars, $this->mJsConfigVars );
2980         }
2981
2982         /**
2983          * To make it harder for someone to slip a user a fake
2984          * user-JavaScript or user-CSS preview, a random token
2985          * is associated with the login session. If it's not
2986          * passed back with the preview request, we won't render
2987          * the code.
2988          *
2989          * @return bool
2990          */
2991         public function userCanPreview() {
2992                 if ( $this->getRequest()->getVal( 'action' ) != 'submit'
2993                         || !$this->getRequest()->wasPosted()
2994                         || !$this->getUser()->matchEditToken(
2995                                 $this->getRequest()->getVal( 'wpEditToken' ) )
2996                 ) {
2997                         return false;
2998                 }
2999                 if ( !$this->getTitle()->isJsSubpage() && !$this->getTitle()->isCssSubpage() ) {
3000                         return false;
3001                 }
3002
3003                 return !count( $this->getTitle()->getUserPermissionsErrors( 'edit', $this->getUser() ) );
3004         }
3005
3006         /**
3007          * @param $addContentType bool: Whether <meta> specifying content type should be returned
3008          *
3009          * @return array in format "link name or number => 'link html'".
3010          */
3011         public function getHeadLinksArray( $addContentType = false ) {
3012                 global $wgUniversalEditButton, $wgFavicon, $wgAppleTouchIcon, $wgEnableAPI,
3013                         $wgSitename, $wgVersion, $wgHtml5, $wgMimeType,
3014                         $wgFeed, $wgOverrideSiteFeed, $wgAdvertisedFeedTypes,
3015                         $wgDisableLangConversion, $wgCanonicalLanguageLinks,
3016                         $wgRightsPage, $wgRightsUrl;
3017
3018                 $tags = array();
3019
3020                 if ( $addContentType ) {
3021                         if ( $wgHtml5 ) {
3022                                 # More succinct than <meta http-equiv=Content-Type>, has the
3023                                 # same effect
3024                                 $tags['meta-charset'] = Html::element( 'meta', array( 'charset' => 'UTF-8' ) );
3025                         } else {
3026                                 $tags['meta-content-type'] = Html::element( 'meta', array(
3027                                         'http-equiv' => 'Content-Type',
3028                                         'content' => "$wgMimeType; charset=UTF-8"
3029                                 ) );
3030                                 $tags['meta-content-style-type'] = Html::element( 'meta', array(  // bug 15835
3031                                         'http-equiv' => 'Content-Style-Type',
3032                                         'content' => 'text/css'
3033                                 ) );
3034                         }
3035                 }
3036
3037                 $tags['meta-generator'] = Html::element( 'meta', array(
3038                         'name' => 'generator',
3039                         'content' => "MediaWiki $wgVersion",
3040                 ) );
3041
3042                 $p = "{$this->mIndexPolicy},{$this->mFollowPolicy}";
3043                 if( $p !== 'index,follow' ) {
3044                         // http://www.robotstxt.org/wc/meta-user.html
3045                         // Only show if it's different from the default robots policy
3046                         $tags['meta-robots'] = Html::element( 'meta', array(
3047                                 'name' => 'robots',
3048                                 'content' => $p,
3049                         ) );
3050                 }
3051
3052                 if ( count( $this->mKeywords ) > 0 ) {
3053                         $strip = array(
3054                                 "/<.*?" . ">/" => '',
3055                                 "/_/" => ' '
3056                         );
3057                         $tags['meta-keywords'] = Html::element( 'meta', array(
3058                                 'name' => 'keywords',
3059                                 'content' =>  preg_replace(
3060                                         array_keys( $strip ),
3061                                         array_values( $strip ),
3062                                         implode( ',', $this->mKeywords )
3063                                 )
3064                         ) );
3065                 }
3066
3067                 foreach ( $this->mMetatags as $tag ) {
3068                         if ( 0 == strcasecmp( 'http:', substr( $tag[0], 0, 5 ) ) ) {
3069                                 $a = 'http-equiv';
3070                                 $tag[0] = substr( $tag[0], 5 );
3071                         } else {
3072                                 $a = 'name';
3073                         }
3074                         $tagName = "meta-{$tag[0]}";
3075                         if ( isset( $tags[$tagName] ) ) {
3076                                 $tagName .= $tag[1];
3077                         }
3078                         $tags[$tagName] = Html::element( 'meta',
3079                                 array(
3080                                         $a => $tag[0],
3081                                         'content' => $tag[1]
3082                                 )
3083                         );
3084                 }
3085
3086                 foreach ( $this->mLinktags as $tag ) {
3087                         $tags[] = Html::element( 'link', $tag );
3088                 }
3089
3090                 # Universal edit button
3091                 if ( $wgUniversalEditButton && $this->isArticleRelated() ) {
3092                         $user = $this->getUser();
3093                         if ( $this->getTitle()->quickUserCan( 'edit', $user )
3094                                 && ( $this->getTitle()->exists() || $this->getTitle()->quickUserCan( 'create', $user ) ) ) {
3095                                 // Original UniversalEditButton
3096                                 $msg = $this->msg( 'edit' )->text();
3097                                 $tags['universal-edit-button'] = Html::element( 'link', array(
3098                                         'rel' => 'alternate',
3099                                         'type' => 'application/x-wiki',
3100                                         'title' => $msg,
3101                                         'href' => $this->getTitle()->getLocalURL( 'action=edit' )
3102                                 ) );
3103                                 // Alternate edit link
3104                                 $tags['alternative-edit'] = Html::element( 'link', array(
3105                                         'rel' => 'edit',
3106                                         'title' => $msg,
3107                                         'href' => $this->getTitle()->getLocalURL( 'action=edit' )
3108                                 ) );
3109                         }
3110                 }
3111
3112                 # Generally the order of the favicon and apple-touch-icon links
3113                 # should not matter, but Konqueror (3.5.9 at least) incorrectly
3114                 # uses whichever one appears later in the HTML source. Make sure
3115                 # apple-touch-icon is specified first to avoid this.
3116                 if ( $wgAppleTouchIcon !== false ) {
3117                         $tags['apple-touch-icon'] = Html::element( 'link', array( 'rel' => 'apple-touch-icon', 'href' => $wgAppleTouchIcon ) );
3118                 }
3119
3120                 if ( $wgFavicon !== false ) {
3121                         $tags['favicon'] = Html::element( 'link', array( 'rel' => 'shortcut icon', 'href' => $wgFavicon ) );
3122                 }
3123
3124                 # OpenSearch description link
3125                 $tags['opensearch'] = Html::element( 'link', array(
3126                         'rel' => 'search',
3127                         'type' => 'application/opensearchdescription+xml',
3128                         'href' => wfScript( 'opensearch_desc' ),
3129                         'title' => $this->msg( 'opensearch-desc' )->inContentLanguage()->text(),
3130                 ) );
3131
3132                 if ( $wgEnableAPI ) {
3133                         # Real Simple Discovery link, provides auto-discovery information
3134                         # for the MediaWiki API (and potentially additional custom API
3135                         # support such as WordPress or Twitter-compatible APIs for a
3136                         # blogging extension, etc)
3137                         $tags['rsd'] = Html::element( 'link', array(
3138                                 'rel' => 'EditURI',
3139                                 'type' => 'application/rsd+xml',
3140                                 // Output a protocol-relative URL here if $wgServer is protocol-relative
3141                                 // Whether RSD accepts relative or protocol-relative URLs is completely undocumented, though
3142                                 'href' => wfExpandUrl( wfAppendQuery( wfScript( 'api' ), array( 'action' => 'rsd' ) ), PROTO_RELATIVE ),
3143                         ) );
3144                 }
3145
3146
3147                 # Language variants
3148                 if ( !$wgDisableLangConversion && $wgCanonicalLanguageLinks ) {
3149                         $lang = $this->getTitle()->getPageLanguage();
3150                         if ( $lang->hasVariants() ) {
3151
3152                                 $urlvar = $lang->getURLVariant();
3153
3154                                 if ( !$urlvar ) {
3155                                         $variants = $lang->getVariants();
3156                                         foreach ( $variants as $_v ) {
3157                                                 $tags["variant-$_v"] = Html::element( 'link', array(
3158                                                         'rel' => 'alternate',
3159                                                         'hreflang' => $_v,
3160                                                         'href' => $this->getTitle()->getLocalURL( array( 'variant' => $_v ) ) )
3161                                                 );
3162                                         }
3163                                 } else {
3164                                         $tags['canonical'] = Html::element( 'link', array(
3165                                                 'rel' => 'canonical',
3166                                                 'href' => $this->getTitle()->getCanonicalUrl()
3167                                         ) );
3168                                 }
3169                         }
3170                 }
3171
3172                 # Copyright
3173                 $copyright = '';
3174                 if ( $wgRightsPage ) {
3175                         $copy = Title::newFromText( $wgRightsPage );
3176
3177                         if ( $copy ) {
3178                                 $copyright = $copy->getLocalURL();
3179                         }
3180                 }
3181
3182                 if ( !$copyright && $wgRightsUrl ) {
3183                         $copyright = $wgRightsUrl;
3184                 }
3185
3186                 if ( $copyright ) {
3187                         $tags['copyright'] = Html::element( 'link', array(
3188                                 'rel' => 'copyright',
3189                                 'href' => $copyright )
3190                         );
3191                 }
3192
3193                 # Feeds
3194                 if ( $wgFeed ) {
3195                         foreach( $this->getSyndicationLinks() as $format => $link ) {
3196                                 # Use the page name for the title.  In principle, this could
3197                                 # lead to issues with having the same name for different feeds
3198                                 # corresponding to the same page, but we can't avoid that at
3199                                 # this low a level.
3200
3201                                 $tags[] = $this->feedLink(
3202                                         $format,
3203                                         $link,
3204                                         # Used messages: 'page-rss-feed' and 'page-atom-feed' (for an easier grep)
3205                                         $this->msg( "page-{$format}-feed", $this->getTitle()->getPrefixedText() )->text()
3206                                 );
3207                         }
3208
3209                         # Recent changes feed should appear on every page (except recentchanges,
3210                         # that would be redundant). Put it after the per-page feed to avoid
3211                         # changing existing behavior. It's still available, probably via a
3212                         # menu in your browser. Some sites might have a different feed they'd
3213                         # like to promote instead of the RC feed (maybe like a "Recent New Articles"
3214                         # or "Breaking news" one). For this, we see if $wgOverrideSiteFeed is defined.
3215                         # If so, use it instead.
3216                         if ( $wgOverrideSiteFeed ) {
3217                                 foreach ( $wgOverrideSiteFeed as $type => $feedUrl ) {
3218                                         // Note, this->feedLink escapes the url.
3219                                         $tags[] = $this->feedLink(
3220                                                 $type,
3221                                                 $feedUrl,
3222                                                 $this->msg( "site-{$type}-feed", $wgSitename )->text()
3223                                         );
3224                                 }
3225                         } elseif ( !$this->getTitle()->isSpecial( 'Recentchanges' ) ) {
3226                                 $rctitle = SpecialPage::getTitleFor( 'Recentchanges' );
3227                                 foreach ( $wgAdvertisedFeedTypes as $format ) {
3228                                         $tags[] = $this->feedLink(
3229                                                 $format,
3230                                                 $rctitle->getLocalURL( "feed={$format}" ),
3231                                                 $this->msg( "site-{$format}-feed", $wgSitename )->text() # For grep: 'site-rss-feed', 'site-atom-feed'.
3232                                         );
3233                                 }
3234                         }
3235                 }
3236                 return $tags;
3237         }
3238
3239         /**
3240          * @param $unused
3241          * @param $addContentType bool: Whether <meta> specifying content type should be returned
3242          *
3243          * @return string HTML tag links to be put in the header.
3244          */
3245         public function getHeadLinks( $unused = null, $addContentType = false ) {
3246                 return implode( "\n", $this->getHeadLinksArray( $addContentType ) );
3247         }
3248
3249         /**
3250          * Generate a <link rel/> for a feed.
3251          *
3252          * @param $type String: feed type
3253          * @param $url String: URL to the feed
3254          * @param $text String: value of the "title" attribute
3255          * @return String: HTML fragment
3256          */
3257         private function feedLink( $type, $url, $text ) {
3258                 return Html::element( 'link', array(
3259                         'rel' => 'alternate',
3260                         'type' => "application/$type+xml",
3261                         'title' => $text,
3262                         'href' => $url )
3263                 );
3264         }
3265
3266         /**
3267          * Add a local or specified stylesheet, with the given media options.
3268          * Meant primarily for internal use...
3269          *
3270          * @param $style String: URL to the file
3271          * @param $media String: to specify a media type, 'screen', 'printable', 'handheld' or any.
3272          * @param $condition String: for IE conditional comments, specifying an IE version
3273          * @param $dir String: set to 'rtl' or 'ltr' for direction-specific sheets
3274          */
3275         public function addStyle( $style, $media = '', $condition = '', $dir = '' ) {
3276                 $options = array();
3277                 // Even though we expect the media type to be lowercase, but here we
3278                 // force it to lowercase to be safe.
3279                 if( $media ) {
3280                         $options['media'] = $media;
3281                 }
3282                 if( $condition ) {
3283                         $options['condition'] = $condition;
3284                 }
3285                 if( $dir ) {
3286                         $options['dir'] = $dir;
3287                 }
3288                 $this->styles[$style] = $options;
3289         }
3290
3291         /**
3292          * Adds inline CSS styles
3293          * @param $style_css Mixed: inline CSS
3294          * @param $flip String: Set to 'flip' to flip the CSS if needed
3295          */
3296         public function addInlineStyle( $style_css, $flip = 'noflip' ) {
3297                 if( $flip === 'flip' && $this->getLanguage()->isRTL() ) {
3298                         # If wanted, and the interface is right-to-left, flip the CSS
3299                         $style_css = CSSJanus::transform( $style_css, true, false );
3300                 }
3301                 $this->mInlineStyles .= Html::inlineStyle( $style_css );
3302         }
3303
3304         /**
3305          * Build a set of <link>s for the stylesheets specified in the $this->styles array.
3306          * These will be applied to various media & IE conditionals.
3307          *
3308          * @return string
3309          */
3310         public function buildCssLinks() {
3311                 global $wgUseSiteCss, $wgAllowUserCss, $wgAllowUserCssPrefs,
3312                         $wgLang, $wgContLang;
3313
3314                 $this->getSkin()->setupSkinUserCss( $this );
3315
3316                 // Add ResourceLoader styles
3317                 // Split the styles into four groups
3318                 $styles = array( 'other' => array(), 'user' => array(), 'site' => array(), 'private' => array(), 'noscript' => array() );
3319                 $otherTags = ''; // Tags to append after the normal <link> tags
3320                 $resourceLoader = $this->getResourceLoader();
3321
3322                 $moduleStyles = $this->getModuleStyles();
3323
3324                 // Per-site custom styles
3325                 if ( $wgUseSiteCss ) {
3326                         $moduleStyles[] = 'site';
3327                         $moduleStyles[] = 'noscript';
3328                         if( $this->getUser()->isLoggedIn() ){
3329                                 $moduleStyles[] = 'user.groups';
3330                         }
3331                 }
3332
3333                 // Per-user custom styles
3334                 if ( $wgAllowUserCss ) {
3335                         if ( $this->getTitle()->isCssSubpage() && $this->userCanPreview() ) {
3336                                 // We're on a preview of a CSS subpage
3337                                 // Exclude this page from the user module in case it's in there (bug 26283)
3338                                 $otherTags .= $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_STYLES, false,
3339                                         array( 'excludepage' => $this->getTitle()->getPrefixedDBkey() )
3340                                 );
3341
3342                                 // Load the previewed CSS
3343                                 // If needed, Janus it first. This is user-supplied CSS, so it's
3344                                 // assumed to be right for the content language directionality.
3345                                 $previewedCSS = $this->getRequest()->getText( 'wpTextbox1' );
3346                                 if ( $wgLang->getDir() !== $wgContLang->getDir() ) {
3347                                         $previewedCSS = CSSJanus::transform( $previewedCSS, true, false );
3348                                 }
3349                                 $otherTags .= Html::inlineStyle( $previewedCSS );
3350                         } else {
3351                                 // Load the user styles normally
3352                                 $moduleStyles[] = 'user';
3353                         }
3354                 }
3355
3356                 // Per-user preference styles
3357                 if ( $wgAllowUserCssPrefs ) {
3358                         $moduleStyles[] = 'user.cssprefs';
3359                 }
3360
3361                 foreach ( $moduleStyles as $name ) {
3362                         $module = $resourceLoader->getModule( $name );
3363                         if ( !$module ) {
3364                                 continue;
3365                         }
3366                         $group = $module->getGroup();
3367                         // Modules in groups named "other" or anything different than "user", "site" or "private"
3368                         // will be placed in the "other" group
3369                         $styles[isset( $styles[$group] ) ? $group : 'other'][] = $name;
3370                 }
3371
3372                 // We want site, private and user styles to override dynamically added styles from modules, but we want
3373                 // dynamically added styles to override statically added styles from other modules. So the order
3374                 // has to be other, dynamic, site, private, user
3375                 // Add statically added styles for other modules
3376                 $ret = $this->makeResourceLoaderLink( $styles['other'], ResourceLoaderModule::TYPE_STYLES );
3377                 // Add normal styles added through addStyle()/addInlineStyle() here
3378                 $ret .= implode( "\n", $this->buildCssLinksArray() ) . $this->mInlineStyles;
3379                 // Add marker tag to mark the place where the client-side loader should inject dynamic styles
3380                 // We use a <meta> tag with a made-up name for this because that's valid HTML
3381                 $ret .= Html::element( 'meta', array( 'name' => 'ResourceLoaderDynamicStyles', 'content' => '' ) ) . "\n";
3382
3383                 // Add site, private and user styles
3384                 // 'private' at present only contains user.options, so put that before 'user'
3385                 // Any future private modules will likely have a similar user-specific character
3386                 foreach ( array( 'site', 'noscript', 'private', 'user' ) as $group ) {
3387                         $ret .= $this->makeResourceLoaderLink( $styles[$group],
3388                                         ResourceLoaderModule::TYPE_STYLES
3389                         );
3390                 }
3391
3392                 // Add stuff in $otherTags (previewed user CSS if applicable)
3393                 $ret .= $otherTags;
3394                 return $ret;
3395         }
3396
3397         /**
3398          * @return Array
3399          */
3400         public function buildCssLinksArray() {
3401                 $links = array();
3402
3403                 // Add any extension CSS
3404                 foreach ( $this->mExtStyles as $url ) {
3405                         $this->addStyle( $url );
3406                 }
3407                 $this->mExtStyles = array();
3408
3409                 foreach( $this->styles as $file => $options ) {
3410                         $link = $this->styleLink( $file, $options );
3411                         if( $link ) {
3412                                 $links[$file] = $link;
3413                         }
3414                 }
3415                 return $links;
3416         }
3417
3418         /**
3419          * Generate \<link\> tags for stylesheets
3420          *
3421          * @param $style String: URL to the file
3422          * @param $options Array: option, can contain 'condition', 'dir', 'media'
3423          *                 keys
3424          * @return String: HTML fragment
3425          */
3426         protected function styleLink( $style, $options ) {
3427                 if( isset( $options['dir'] ) ) {
3428                         if( $this->getLanguage()->getDir() != $options['dir'] ) {
3429                                 return '';
3430                         }
3431                 }
3432
3433                 if( isset( $options['media'] ) ) {
3434                         $media = self::transformCssMedia( $options['media'] );
3435                         if( is_null( $media ) ) {
3436                                 return '';
3437                         }
3438                 } else {
3439                         $media = 'all';
3440                 }
3441
3442                 if( substr( $style, 0, 1 ) == '/' ||
3443                         substr( $style, 0, 5 ) == 'http:' ||
3444                         substr( $style, 0, 6 ) == 'https:' ) {
3445                         $url = $style;
3446                 } else {
3447                         global $wgStylePath, $wgStyleVersion;
3448                         $url = $wgStylePath . '/' . $style . '?' . $wgStyleVersion;
3449                 }
3450
3451                 $link = Html::linkedStyle( $url, $media );
3452
3453                 if( isset( $options['condition'] ) ) {
3454                         $condition = htmlspecialchars( $options['condition'] );
3455                         $link = "<!--[if $condition]>$link<![endif]-->";
3456                 }
3457                 return $link;
3458         }
3459
3460         /**
3461          * Transform "media" attribute based on request parameters
3462          *
3463          * @param $media String: current value of the "media" attribute
3464          * @return String: modified value of the "media" attribute
3465          */
3466         public static function transformCssMedia( $media ) {
3467                 global $wgRequest, $wgHandheldForIPhone;
3468
3469                 // Switch in on-screen display for media testing
3470                 $switches = array(
3471                         'printable' => 'print',
3472                         'handheld' => 'handheld',
3473                 );
3474                 foreach( $switches as $switch => $targetMedia ) {
3475                         if( $wgRequest->getBool( $switch ) ) {
3476                                 if( $media == $targetMedia ) {
3477                                         $media = '';
3478                                 } elseif( $media == 'screen' ) {
3479                                         return null;
3480                                 }
3481                         }
3482                 }
3483
3484                 // Expand longer media queries as iPhone doesn't grok 'handheld'
3485                 if( $wgHandheldForIPhone ) {
3486                         $mediaAliases = array(
3487                                 'screen' => 'screen and (min-device-width: 481px)',
3488                                 'handheld' => 'handheld, only screen and (max-device-width: 480px)',
3489                         );
3490
3491                         if( isset( $mediaAliases[$media] ) ) {
3492                                 $media = $mediaAliases[$media];
3493                         }
3494                 }
3495
3496                 return $media;
3497         }
3498
3499         /**
3500          * Add a wikitext-formatted message to the output.
3501          * This is equivalent to:
3502          *
3503          *    $wgOut->addWikiText( wfMsgNoTrans( ... ) )
3504          */
3505         public function addWikiMsg( /*...*/ ) {
3506                 $args = func_get_args();
3507                 $name = array_shift( $args );
3508                 $this->addWikiMsgArray( $name, $args );
3509         }
3510
3511         /**
3512          * Add a wikitext-formatted message to the output.
3513          * Like addWikiMsg() except the parameters are taken as an array
3514          * instead of a variable argument list.
3515          *
3516          * @param $name string
3517          * @param $args array
3518          */
3519         public function addWikiMsgArray( $name, $args ) {
3520                 $this->addHTML( $this->msg( $name, $args )->parseAsBlock() );
3521         }
3522
3523         /**
3524          * This function takes a number of message/argument specifications, wraps them in
3525          * some overall structure, and then parses the result and adds it to the output.
3526          *
3527          * In the $wrap, $1 is replaced with the first message, $2 with the second, and so
3528          * on. The subsequent arguments may either be strings, in which case they are the
3529          * message names, or arrays, in which case the first element is the message name,
3530          * and subsequent elements are the parameters to that message.
3531          *
3532          * The special named parameter 'options' in a message specification array is passed
3533          * through to the $options parameter of wfMsgExt().
3534          *
3535          * Don't use this for messages that are not in users interface language.
3536          *
3537          * For example:
3538          *
3539          *    $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>", 'some-error' );
3540          *
3541          * Is equivalent to:
3542          *
3543          *    $wgOut->addWikiText( "<div class='error'>\n" . wfMsgNoTrans( 'some-error' ) . "\n</div>" );
3544          *
3545          * The newline after opening div is needed in some wikitext. See bug 19226.
3546          *
3547          * @param $wrap string
3548          */
3549         public function wrapWikiMsg( $wrap /*, ...*/ ) {
3550                 $msgSpecs = func_get_args();
3551                 array_shift( $msgSpecs );
3552                 $msgSpecs = array_values( $msgSpecs );
3553                 $s = $wrap;
3554                 foreach ( $msgSpecs as $n => $spec ) {
3555                         $options = array();
3556                         if ( is_array( $spec ) ) {
3557                                 $args = $spec;
3558                                 $name = array_shift( $args );
3559                                 if ( isset( $args['options'] ) ) {
3560                                         $options = $args['options'];
3561                                         unset( $args['options'] );
3562                                 }
3563                         }  else {
3564                                 $args = array();
3565                                 $name = $spec;
3566                         }
3567                         $s = str_replace( '$' . ( $n + 1 ), wfMsgExt( $name, $options, $args ), $s );
3568                 }
3569                 $this->addWikiText( $s );
3570         }
3571
3572         /**
3573          * Include jQuery core. Use this to avoid loading it multiple times
3574          * before we get a usable script loader.
3575          *
3576          * @param $modules Array: list of jQuery modules which should be loaded
3577          * @return Array: the list of modules which were not loaded.
3578          * @since 1.16
3579          * @deprecated since 1.17
3580          */
3581         public function includeJQuery( $modules = array() ) {
3582                 return array();
3583         }
3584
3585 }