includes/OutputPage.php

   1 <?php
   2 if ( !defined( 'MEDIAWIKI' ) ) {
   3         die( 1 );
   4 }
   5
   6 /**
   7  * This class should be covered by a general architecture document which does
   8  * not exist as of January 2011.  This is one of the Core classes and should
   9  * be read at least once by any new developers.
  10  *
  11  * This class is used to prepare the final rendering. A skin is then
  12  * applied to the output parameters (links, javascript, html, categories ...).
  13  *
  14  * @todo FIXME: Another class handles sending the whole page to the client.
  15  *
  16  * Some comments comes from a pairing session between Zak Greant and Ashar Voultoiz
  17  * in November 2010.
  18  *
  19  * @todo document
  20  */
  21 class OutputPage {
  22         /// Should be private. Used with addMeta() which adds <meta>
  23         var $mMetatags = array();
  24
  25         /// <meta keyworkds="stuff"> most of the time the first 10 links to an article
  26         var $mKeywords = array();
  27
  28         var $mLinktags = array();
  29
  30         /// Additional stylesheets. Looks like this is for extensions. Might be replaced by resource loader.
  31         var $mExtStyles = array();
  32
  33         /// Should be private - has getter and setter. Contains the HTML title
  34         var $mPagetitle = '';
  35
  36         /// Contains all of the <body> content. Should be private we got set/get accessors and the append() method.
  37         var $mBodytext = '';
  38
  39         /**
  40          * Holds the debug lines that will be output as comments in page source if
  41          * $wgDebugComments is enabled. See also $wgShowDebug.
  42          * TODO: make a getter method for this
  43          */
  44         public $mDebugtext = ''; // TODO: we might want to replace it by wfDebug() wfDebugLog()
  45
  46         /// Should be private. Stores contents of <title> tag
  47         var $mHTMLtitle = '';
  48
  49         /// Should be private. Is the displayed content related to the source of the corresponding wiki article.
  50         var $mIsarticle = true;
  51
  52         /**
  53          * Should be private. We have to set isPrintable(). Some pages should
  54          * never be printed (ex: redirections).
  55          */
  56         var $mPrintable = false;
  57
  58         /**
  59          * Should be private. We have set/get/append methods.
  60          *
  61          * Contains the page subtitle. Special pages usually have some links here.
  62          * Don't confuse with site subtitle added by skins.
  63          */
  64         var $mSubtitle = '';
  65
  66         var $mRedirect = '';
  67         var $mStatusCode;
  68
  69         /**
  70          * mLastModified and mEtag are used for sending cache control.
  71          * The whole caching system should probably be moved into its own class.
  72          */
  73         var $mLastModified = '';
  74
  75         /**
  76          * Should be private. No getter but used in sendCacheControl();
  77          * Contains an HTTP Entity Tags (see RFC 2616 section 3.13) which is used
  78          * as a unique identifier for the content. It is later used by the client
  79          * to compare its cached version with the server version. Client sends
  80          * headers If-Match and If-None-Match containing its locally cached ETAG value.
  81          *
  82          * To get more information, you will have to look at HTTP/1.1 protocol which
  83          * is properly described in RFC 2616 : http://tools.ietf.org/html/rfc2616
  84          */
  85         var $mETag = false;
  86
  87         var $mCategoryLinks = array();
  88         var $mCategories = array();
  89
  90         /// Should be private. Array of Interwiki Prefixed (non DB key) Titles (e.g. 'fr:Test page')
  91         var $mLanguageLinks = array();
  92
  93         /**
  94          * Should be private. Used for JavaScript (pre resource loader)
  95          * We should split js / css.
  96          * mScripts content is inserted as is in <head> by Skin. This might contains
  97          * either a link to a stylesheet or inline css.
  98          */
  99         var $mScripts = '';
 100
 101         /**
 102          * Inline CSS styles. Use addInlineStyle() sparsingly
 103          */
 104         var $mInlineStyles = '';
 105
 106         //
 107         var $mLinkColours;
 108
 109         /**
 110          * Used by skin template.
 111          * Example: $tpl->set( 'displaytitle', $out->mPageLinkTitle );
 112          */
 113         var $mPageLinkTitle = '';
 114
 115         /// Array of elements in <head>. Parser might add its own headers!
 116         var $mHeadItems = array();
 117
 118         // @todo FIXME: Next variables probably comes from the resource loader
 119         var $mModules = array(), $mModuleScripts = array(), $mModuleStyles = array(), $mModuleMessages = array();
 120         var $mResourceLoader;
 121
 122         /** @todo FIXME: Is this still used ?*/
 123         var $mInlineMsg = array();
 124
 125         var $mTemplateIds = array();
 126         var $mImageTimeKeys = array();
 127
 128     var $mRedirectCode = '';
 129
 130     var $mFeedLinksAppendQuery = null;
 131
 132         # What level of 'untrustworthiness' is allowed in CSS/JS modules loaded on this page?
 133         # @see ResourceLoaderModule::$origin
 134         # ResourceLoaderModule::ORIGIN_ALL is assumed unless overridden;
 135         protected $mAllowedModules = array(
 136                 ResourceLoaderModule::TYPE_COMBINED => ResourceLoaderModule::ORIGIN_ALL,
 137         );
 138
 139         /**
 140          * @EasterEgg I just love the name for this self documenting variable.
 141          * @todo document
 142          */
 143         var $mDoNothing = false;
 144
 145         // Parser related.
 146         var $mContainsOldMagic = 0, $mContainsNewMagic = 0;
 147
 148         /**
 149          * Should be private. Has get/set methods properly documented.
 150          * Stores "article flag" toggle.
 151          */
 152         var $mIsArticleRelated = true;
 153
 154         /// lazy initialised, use parserOptions()
 155         protected $mParserOptions = null;
 156
 157         /**
 158          * Handles the atom / rss links.
 159          * We probably only support atom in 2011.
 160          * Looks like a private variable.
 161          * @see $wgAdvertisedFeedTypes
 162          */
 163         var $mFeedLinks = array();
 164
 165         // Gwicke work on squid caching? Roughly from 2003.
 166         var $mEnableClientCache = true;
 167
 168         /**
 169          * Flag if output should only contain the body of the article.
 170          * Should be private.
 171          */
 172         var $mArticleBodyOnly = false;
 173
 174         var $mNewSectionLink = false;
 175         var $mHideNewSectionLink = false;
 176
 177         /**
 178          * Comes from the parser. This was probably made to load CSS/JS only
 179          * if we had <gallery>. Used directly in CategoryPage.php
 180          * Looks like resource loader can replace this.
 181          */
 182         var $mNoGallery = false;
 183
 184         // should be private.
 185         var $mPageTitleActionText = '';
 186         var $mParseWarnings = array();
 187
 188         // Cache stuff. Looks like mEnableClientCache
 189         var $mSquidMaxage = 0;
 190
 191         // @todo document
 192         var $mPreventClickjacking = true;
 193
 194         /// should be private. To include the variable {{REVISIONID}}
 195         var $mRevisionId = null;
 196
 197         var $mFileVersion = null;
 198
 199         private $mContext;
 200
 201         /**
 202          * An array of stylesheet filenames (relative from skins path), with options
 203          * for CSS media, IE conditions, and RTL/LTR direction.
 204          * For internal use; add settings in the skin via $this->addStyle()
 205          *
 206          * Style again! This seems like a code duplication since we already have
 207          * mStyles. This is what makes OpenSource amazing.
 208          */
 209         var $styles = array();
 210
 211         /**
 212          * Whether jQuery is already handled.
 213          */
 214         protected $mJQueryDone = false;
 215
 216         private $mIndexPolicy = 'index';
 217         private $mFollowPolicy = 'follow';
 218         private $mVaryHeader = array(
 219                 'Accept-Encoding' => array( 'list-contains=gzip' ),
 220                 'Cookie' => null
 221         );
 222
 223         /**
 224          * Constructor for OutputPage. This should not be called directly.
 225          * Instead a new RequestContext should be created and it will implicitly create
 226          * a OutputPage tied to that context.
 227          */
 228         function __construct( RequestContext $context = null ) {
 229                 if ( !isset($context) ) {
 230                         # Extensions should use `new RequestContext` instead of `new OutputPage` now.
 231                         wfDeprecated( __METHOD__ );
 232                 }
 233                 $this->mContext = $context;
 234         }
 235
 236         /**
 237          * Redirect to $url rather than displaying the normal page
 238          *
 239          * @param $url String: URL
 240          * @param $responsecode String: HTTP status code
 241          */
 242         public function redirect( $url, $responsecode = '302' ) {
 243                 # Strip newlines as a paranoia check for header injection in PHP<5.1.2
 244                 $this->mRedirect = str_replace( "\n", '', $url );
 245                 $this->mRedirectCode = $responsecode;
 246         }
 247
 248         /**
 249          * Get the URL to redirect to, or an empty string if not redirect URL set
 250          *
 251          * @return String
 252          */
 253         public function getRedirect() {
 254                 return $this->mRedirect;
 255         }
 256
 257         /**
 258          * Set the HTTP status code to send with the output.
 259          *
 260          * @param $statusCode Integer
 261          */
 262         public function setStatusCode( $statusCode ) {
 263                 $this->mStatusCode = $statusCode;
 264         }
 265
 266         /**
 267          * Add a new <meta> tag
 268          * To add an http-equiv meta tag, precede the name with "http:"
 269          *
 270          * @param $name String tag name
 271          * @param $val String tag value
 272          */
 273         function addMeta( $name, $val ) {
 274                 array_push( $this->mMetatags, array( $name, $val ) );
 275         }
 276
 277         /**
 278          * Add a keyword or a list of keywords in the page header
 279          *
 280          * @param $text String or array of strings
 281          */
 282         function addKeyword( $text ) {
 283                 if( is_array( $text ) ) {
 284                         $this->mKeywords = array_merge( $this->mKeywords, $text );
 285                 } else {
 286                         array_push( $this->mKeywords, $text );
 287                 }
 288         }
 289
 290         /**
 291          * Add a new \<link\> tag to the page header
 292          *
 293          * @param $linkarr Array: associative array of attributes.
 294          */
 295         function addLink( $linkarr ) {
 296                 array_push( $this->mLinktags, $linkarr );
 297         }
 298
 299         /**
 300          * Add a new \<link\> with "rel" attribute set to "meta"
 301          *
 302          * @param $linkarr Array: associative array mapping attribute names to their
 303          *                 values, both keys and values will be escaped, and the
 304          *                 "rel" attribute will be automatically added
 305          */
 306         function addMetadataLink( $linkarr ) {
 307                 $linkarr['rel'] = $this->getMetadataAttribute();
 308                 $this->addLink( $linkarr );
 309         }
 310
 311         /**
 312          * Get the value of the "rel" attribute for metadata links
 313          *
 314          * @return String
 315          */
 316         public function getMetadataAttribute() {
 317                 # note: buggy CC software only reads first "meta" link
 318                 static $haveMeta = false;
 319                 if ( $haveMeta ) {
 320                         return 'alternate meta';
 321                 } else {
 322                         $haveMeta = true;
 323                         return 'meta';
 324                 }
 325         }
 326
 327         /**
 328          * Add raw HTML to the list of scripts (including \<script\> tag, etc.)
 329          *
 330          * @param $script String: raw HTML
 331          */
 332         function addScript( $script ) {
 333                 $this->mScripts .= $script . "\n";
 334         }
 335
 336         /**
 337          * Register and add a stylesheet from an extension directory.
 338          *
 339          * @param $url String path to sheet.  Provide either a full url (beginning
 340          *             with 'http', etc) or a relative path from the document root
 341          *             (beginning with '/').  Otherwise it behaves identically to
 342          *             addStyle() and draws from the /skins folder.
 343          */
 344         public function addExtensionStyle( $url ) {
 345                 array_push( $this->mExtStyles, $url );
 346         }
 347
 348         /**
 349          * Get all styles added by extensions
 350          *
 351          * @return Array
 352          */
 353         function getExtStyle() {
 354                 return $this->mExtStyles;
 355         }
 356
 357         /**
 358          * Add a JavaScript file out of skins/common, or a given relative path.
 359          *
 360          * @param $file String: filename in skins/common or complete on-server path
 361          *              (/foo/bar.js)
 362          * @param $version String: style version of the file. Defaults to $wgStyleVersion
 363          */
 364         public function addScriptFile( $file, $version = null ) {
 365                 global $wgStylePath, $wgStyleVersion;
 366                 // See if $file parameter is an absolute URL or begins with a slash
 367                 if( substr( $file, 0, 1 ) == '/' || preg_match( '#^[a-z]*://#i', $file ) ) {
 368                         $path = $file;
 369                 } else {
 370                         $path = "{$wgStylePath}/common/{$file}";
 371                 }
 372                 if ( is_null( $version ) )
 373                         $version = $wgStyleVersion;
 374                 $this->addScript( Html::linkedScript( wfAppendQuery( $path, $version ) ) );
 375         }
 376
 377         /**
 378          * Add a self-contained script tag with the given contents
 379          *
 380          * @param $script String: JavaScript text, no <script> tags
 381          */
 382         public function addInlineScript( $script ) {
 383                 $this->mScripts .= Html::inlineScript( "\n$script\n" ) . "\n";
 384         }
 385
 386         /**
 387          * Get all registered JS and CSS tags for the header.
 388          *
 389          * @return String
 390          */
 391         function getScript() {
 392                 return $this->mScripts . $this->getHeadItems();
 393         }
 394
 395         /**
 396          * Filter an array of modules to remove insufficiently trustworthy members, and modules
 397          * which are no longer registered (eg a page is cached before an extension is disabled)
 398          * @param $modules Array
 399          * @param $position String if not null, only return modules with this position
 400          * @param $type string
 401          * @return Array
 402          */
 403         protected function filterModules( $modules, $position = null, $type = ResourceLoaderModule::TYPE_COMBINED ){
 404                 $resourceLoader = $this->getResourceLoader();
 405                 $filteredModules = array();
 406                 foreach( $modules as $val ){
 407                         $module = $resourceLoader->getModule( $val );
 408                         if( $module instanceof ResourceLoaderModule
 409                                 && $module->getOrigin() <= $this->getAllowedModules( $type )
 410                                 && ( is_null( $position ) || $module->getPosition() == $position ) )
 411                         {
 412                                 $filteredModules[] = $val;
 413                         }
 414                 }
 415                 return $filteredModules;
 416         }
 417
 418         /**
 419          * Get the list of modules to include on this page
 420          *
 421          * @param $filter Bool whether to filter out insufficiently trustworthy modules
 422          * @param $position String if not null, only return modules with this position
 423          * @param $param string
 424          * @return Array of module names
 425          */
 426         public function getModules( $filter = false, $position = null, $param = 'mModules' ) {
 427                 $modules = array_values( array_unique( $this->$param ) );
 428                 return $filter
 429                         ? $this->filterModules( $modules, $position )
 430                         : $modules;
 431         }
 432
 433         /**
 434          * Add one or more modules recognized by the resource loader. Modules added
 435          * through this function will be loaded by the resource loader when the
 436          * page loads.
 437          *
 438          * @param $modules Mixed: module name (string) or array of module names
 439          */
 440         public function addModules( $modules ) {
 441                 $this->mModules = array_merge( $this->mModules, (array)$modules );
 442         }
 443
 444         /**
 445          * Get the list of module JS to include on this page
 446          *
 447          * @param $filter
 448          * @param $position
 449          *
 450          * @return array of module names
 451          */
 452         public function getModuleScripts( $filter = false, $position = null ) {
 453                 return $this->getModules( $filter, $position, 'mModuleScripts' );
 454         }
 455
 456         /**
 457          * Add only JS of one or more modules recognized by the resource loader. Module
 458          * scripts added through this function will be loaded by the resource loader when
 459          * the page loads.
 460          *
 461          * @param $modules Mixed: module name (string) or array of module names
 462          */
 463         public function addModuleScripts( $modules ) {
 464                 $this->mModuleScripts = array_merge( $this->mModuleScripts, (array)$modules );
 465         }
 466
 467         /**
 468          * Get the list of module CSS to include on this page
 469          *
 470          * @param $filter
 471          * @param $position
 472          *
 473          * @return Array of module names
 474          */
 475         public function getModuleStyles( $filter = false, $position = null ) {
 476                 return $this->getModules( $filter,  $position, 'mModuleStyles' );
 477         }
 478
 479         /**
 480          * Add only CSS of one or more modules recognized by the resource loader. Module
 481          * styles added through this function will be loaded by the resource loader when
 482          * the page loads.
 483          *
 484          * @param $modules Mixed: module name (string) or array of module names
 485          */
 486         public function addModuleStyles( $modules ) {
 487                 $this->mModuleStyles = array_merge( $this->mModuleStyles, (array)$modules );
 488         }
 489
 490         /**
 491          * Get the list of module messages to include on this page
 492          *
 493          * @param $filter
 494          * @param $position
 495          *
 496          * @return Array of module names
 497          */
 498         public function getModuleMessages( $filter = false, $position = null ) {
 499                 return $this->getModules( $filter, $position, 'mModuleMessages' );
 500         }
 501
 502         /**
 503          * Add only messages of one or more modules recognized by the resource loader.
 504          * Module messages added through this function will be loaded by the resource
 505          * loader when the page loads.
 506          *
 507          * @param $modules Mixed: module name (string) or array of module names
 508          */
 509         public function addModuleMessages( $modules ) {
 510                 $this->mModuleMessages = array_merge( $this->mModuleMessages, (array)$modules );
 511         }
 512
 513         /**
 514          * Get all header items in a string
 515          *
 516          * @return String
 517          */
 518         function getHeadItems() {
 519                 $s = '';
 520                 foreach ( $this->mHeadItems as $item ) {
 521                         $s .= $item;
 522                 }
 523                 return $s;
 524         }
 525
 526         /**
 527          * Add or replace an header item to the output
 528          *
 529          * @param $name String: item name
 530          * @param $value String: raw HTML
 531          */
 532         public function addHeadItem( $name, $value ) {
 533                 $this->mHeadItems[$name] = $value;
 534         }
 535
 536         /**
 537          * Check if the header item $name is already set
 538          *
 539          * @param $name String: item name
 540          * @return Boolean
 541          */
 542         public function hasHeadItem( $name ) {
 543                 return isset( $this->mHeadItems[$name] );
 544         }
 545
 546         /**
 547          * Set the value of the ETag HTTP header, only used if $wgUseETag is true
 548          *
 549          * @param $tag String: value of "ETag" header
 550          */
 551         function setETag( $tag ) {
 552                 $this->mETag = $tag;
 553         }
 554
 555         /**
 556          * Set whether the output should only contain the body of the article,
 557          * without any skin, sidebar, etc.
 558          * Used e.g. when calling with "action=render".
 559          *
 560          * @param $only Boolean: whether to output only the body of the article
 561          */
 562         public function setArticleBodyOnly( $only ) {
 563                 $this->mArticleBodyOnly = $only;
 564         }
 565
 566         /**
 567          * Return whether the output will contain only the body of the article
 568          *
 569          * @return Boolean
 570          */
 571         public function getArticleBodyOnly() {
 572                 return $this->mArticleBodyOnly;
 573         }
 574
 575         /**
 576          * checkLastModified tells the client to use the client-cached page if
 577          * possible. If sucessful, the OutputPage is disabled so that
 578          * any future call to OutputPage->output() have no effect.
 579          *
 580          * Side effect: sets mLastModified for Last-Modified header
 581          *
 582          * @param $timestamp string
 583          *
 584          * @return Boolean: true iff cache-ok headers was sent.
 585          */
 586         public function checkLastModified( $timestamp ) {
 587                 global $wgCachePages, $wgCacheEpoch;
 588
 589                 if ( !$timestamp || $timestamp == '19700101000000' ) {
 590                         wfDebug( __METHOD__ . ": CACHE DISABLED, NO TIMESTAMP\n" );
 591                         return false;
 592                 }
 593                 if( !$wgCachePages ) {
 594                         wfDebug( __METHOD__ . ": CACHE DISABLED\n", false );
 595                         return false;
 596                 }
 597                 if( $this->getUser()->getOption( 'nocache' ) ) {
 598                         wfDebug( __METHOD__ . ": USER DISABLED CACHE\n", false );
 599                         return false;
 600                 }
 601
 602                 $timestamp = wfTimestamp( TS_MW, $timestamp );
 603                 $modifiedTimes = array(
 604                         'page' => $timestamp,
 605                         'user' => $this->getUser()->getTouched(),
 606                         'epoch' => $wgCacheEpoch
 607                 );
 608                 wfRunHooks( 'OutputPageCheckLastModified', array( &$modifiedTimes ) );
 609
 610                 $maxModified = max( $modifiedTimes );
 611                 $this->mLastModified = wfTimestamp( TS_RFC2822, $maxModified );
 612
 613                 if( empty( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) ) {
 614                         wfDebug( __METHOD__ . ": client did not send If-Modified-Since header\n", false );
 615                         return false;
 616                 }
 617
 618                 # Make debug info
 619                 $info = '';
 620                 foreach ( $modifiedTimes as $name => $value ) {
 621                         if ( $info !== '' ) {
 622                                 $info .= ', ';
 623                         }
 624                         $info .= "$name=" . wfTimestamp( TS_ISO_8601, $value );
 625                 }
 626
 627                 # IE sends sizes after the date like this:
 628                 # Wed, 20 Aug 2003 06:51:19 GMT; length=5202
 629                 # this breaks strtotime().
 630                 $clientHeader = preg_replace( '/;.*$/', '', $_SERVER["HTTP_IF_MODIFIED_SINCE"] );
 631
 632                 wfSuppressWarnings(); // E_STRICT system time bitching
 633                 $clientHeaderTime = strtotime( $clientHeader );
 634                 wfRestoreWarnings();
 635                 if ( !$clientHeaderTime ) {
 636                         wfDebug( __METHOD__ . ": unable to parse the client's If-Modified-Since header: $clientHeader\n" );
 637                         return false;
 638                 }
 639                 $clientHeaderTime = wfTimestamp( TS_MW, $clientHeaderTime );
 640
 641                 wfDebug( __METHOD__ . ": client sent If-Modified-Since: " .
 642                         wfTimestamp( TS_ISO_8601, $clientHeaderTime ) . "\n", false );
 643                 wfDebug( __METHOD__ . ": effective Last-Modified: " .
 644                         wfTimestamp( TS_ISO_8601, $maxModified ) . "\n", false );
 645                 if( $clientHeaderTime < $maxModified ) {
 646                         wfDebug( __METHOD__ . ": STALE, $info\n", false );
 647                         return false;
 648                 }
 649
 650                 # Not modified
 651                 # Give a 304 response code and disable body output
 652                 wfDebug( __METHOD__ . ": NOT MODIFIED, $info\n", false );
 653                 ini_set( 'zlib.output_compression', 0 );
 654                 $this->getRequest()->response()->header( "HTTP/1.1 304 Not Modified" );
 655                 $this->sendCacheControl();
 656                 $this->disable();
 657
 658                 // Don't output a compressed blob when using ob_gzhandler;
 659                 // it's technically against HTTP spec and seems to confuse
 660                 // Firefox when the response gets split over two packets.
 661                 wfClearOutputBuffers();
 662
 663                 return true;
 664         }
 665
 666         /**
 667          * Override the last modified timestamp
 668          *
 669          * @param $timestamp String: new timestamp, in a format readable by
 670          *        wfTimestamp()
 671          */
 672         public function setLastModified( $timestamp ) {
 673                 $this->mLastModified = wfTimestamp( TS_RFC2822, $timestamp );
 674         }
 675
 676         /**
 677          * Set the robot policy for the page: <http://www.robotstxt.org/meta.html>
 678          *
 679          * @param $policy String: the literal string to output as the contents of
 680          *   the meta tag.  Will be parsed according to the spec and output in
 681          *   standardized form.
 682          * @return null
 683          */
 684         public function setRobotPolicy( $policy ) {
 685                 $policy = Article::formatRobotPolicy( $policy );
 686
 687                 if( isset( $policy['index'] ) ) {
 688                         $this->setIndexPolicy( $policy['index'] );
 689                 }
 690                 if( isset( $policy['follow'] ) ) {
 691                         $this->setFollowPolicy( $policy['follow'] );
 692                 }
 693         }
 694
 695         /**
 696          * Set the index policy for the page, but leave the follow policy un-
 697          * touched.
 698          *
 699          * @param $policy string Either 'index' or 'noindex'.
 700          * @return null
 701          */
 702         public function setIndexPolicy( $policy ) {
 703                 $policy = trim( $policy );
 704                 if( in_array( $policy, array( 'index', 'noindex' ) ) ) {
 705                         $this->mIndexPolicy = $policy;
 706                 }
 707         }
 708
 709         /**
 710          * Set the follow policy for the page, but leave the index policy un-
 711          * touched.
 712          *
 713          * @param $policy String: either 'follow' or 'nofollow'.
 714          * @return null
 715          */
 716         public function setFollowPolicy( $policy ) {
 717                 $policy = trim( $policy );
 718                 if( in_array( $policy, array( 'follow', 'nofollow' ) ) ) {
 719                         $this->mFollowPolicy = $policy;
 720                 }
 721         }
 722
 723         /**
 724          * Set the new value of the "action text", this will be added to the
 725          * "HTML title", separated from it with " - ".
 726          *
 727          * @param $text String: new value of the "action text"
 728          */
 729         public function setPageTitleActionText( $text ) {
 730                 $this->mPageTitleActionText = $text;
 731         }
 732
 733         /**
 734          * Get the value of the "action text"
 735          *
 736          * @return String
 737          */
 738         public function getPageTitleActionText() {
 739                 if ( isset( $this->mPageTitleActionText ) ) {
 740                         return $this->mPageTitleActionText;
 741                 }
 742         }
 743
 744         /**
 745          * "HTML title" means the contents of <title>.
 746          * It is stored as plain, unescaped text and will be run through htmlspecialchars in the skin file.
 747          *
 748          * @param $name string
 749          */
 750         public function setHTMLTitle( $name ) {
 751                 $this->mHTMLtitle = $name;
 752         }
 753
 754         /**
 755          * Return the "HTML title", i.e. the content of the <title> tag.
 756          *
 757          * @return String
 758          */
 759         public function getHTMLTitle() {
 760                 return $this->mHTMLtitle;
 761         }
 762
 763         /**
 764          * "Page title" means the contents of \<h1\>. It is stored as a valid HTML fragment.
 765          * This function allows good tags like \<sup\> in the \<h1\> tag, but not bad tags like \<script\>.
 766          * This function automatically sets \<title\> to the same content as \<h1\> but with all tags removed.
 767          * Bad tags that were escaped in \<h1\> will still be escaped in \<title\>, and good tags like \<i\> will be dropped entirely.
 768          *
 769          * @param $name string
 770          */
 771         public function setPageTitle( $name ) {
 772                 # change "<script>foo&bar</script>" to "&lt;script&gt;foo&amp;bar&lt;/script&gt;"
 773                 # but leave "<i>foobar</i>" alone
 774                 $nameWithTags = Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags( $name ) );
 775                 $this->mPagetitle = $nameWithTags;
 776
 777                 # change "<i>foo&amp;bar</i>" to "foo&bar"
 778                 $this->setHTMLTitle( wfMsg( 'pagetitle', Sanitizer::stripAllTags( $nameWithTags ) ) );
 779         }
 780
 781         /**
 782          * Return the "page title", i.e. the content of the \<h1\> tag.
 783          *
 784          * @return String
 785          */
 786         public function getPageTitle() {
 787                 return $this->mPagetitle;
 788         }
 789
 790         /**
 791          * Get the RequestContext used in this instance
 792          *
 793          * @return RequestContext
 794          */
 795         private function getContext() {
 796                 if ( !isset($this->mContext) ) {
 797                         wfDebug( __METHOD__ . " called and \$mContext is null. Using RequestContext::getMain(); for sanity\n" );
 798                         $this->mContext = RequestContext::getMain();
 799                 }
 800                 return $this->mContext;
 801         }
 802
 803         /**
 804          * Get the WebRequest being used for this instance
 805          *
 806          * @return WebRequest
 807          * @since 1.18
 808          */
 809         public function getRequest() {
 810                 return $this->getContext()->getRequest();
 811         }
 812
 813         /**
 814          * Set the Title object to use
 815          *
 816          * @param $t Title object
 817          */
 818         public function setTitle( $t ) {
 819                 $this->getContext()->setTitle( $t );
 820         }
 821
 822         /**
 823          * Get the Title object used in this instance
 824          *
 825          * @return Title
 826          */
 827         public function getTitle() {
 828                 return $this->getContext()->getTitle();
 829         }
 830
 831         /**
 832          * Get the User object used in this instance
 833          *
 834          * @return User
 835          * @since 1.18
 836          */
 837         public function getUser() {
 838                 return $this->getContext()->getUser();
 839         }
 840
 841         /**
 842          * Get the Skin object used to render this instance
 843          *
 844          * @return Skin
 845          * @since 1.18
 846          */
 847         public function getSkin() {
 848                 return $this->getContext()->getSkin();
 849         }
 850
 851         /**
 852          * Replace the subtile with $str
 853          *
 854          * @param $str String: new value of the subtitle
 855          */
 856         public function setSubtitle( $str ) {
 857                 $this->mSubtitle = /*$this->parse(*/ $str /*)*/; // @bug 2514
 858         }
 859
 860         /**
 861          * Add $str to the subtitle
 862          *
 863          * @param $str String to add to the subtitle
 864          */
 865         public function appendSubtitle( $str ) {
 866                 $this->mSubtitle .= /*$this->parse(*/ $str /*)*/; // @bug 2514
 867         }
 868
 869         /**
 870          * Get the subtitle
 871          *
 872          * @return String
 873          */
 874         public function getSubtitle() {
 875                 return $this->mSubtitle;
 876         }
 877
 878         /**
 879          * Set the page as printable, i.e. it'll be displayed with with all
 880          * print styles included
 881          */
 882         public function setPrintable() {
 883                 $this->mPrintable = true;
 884         }
 885
 886         /**
 887          * Return whether the page is "printable"
 888          *
 889          * @return Boolean
 890          */
 891         public function isPrintable() {
 892                 return $this->mPrintable;
 893         }
 894
 895         /**
 896          * Disable output completely, i.e. calling output() will have no effect
 897          */
 898         public function disable() {
 899                 $this->mDoNothing = true;
 900         }
 901
 902         /**
 903          * Return whether the output will be completely disabled
 904          *
 905          * @return Boolean
 906          */
 907         public function isDisabled() {
 908                 return $this->mDoNothing;
 909         }
 910
 911         /**
 912          * Show an "add new section" link?
 913          *
 914          * @return Boolean
 915          */
 916         public function showNewSectionLink() {
 917                 return $this->mNewSectionLink;
 918         }
 919
 920         /**
 921          * Forcibly hide the new section link?
 922          *
 923          * @return Boolean
 924          */
 925         public function forceHideNewSectionLink() {
 926                 return $this->mHideNewSectionLink;
 927         }
 928
 929         /**
 930          * Add or remove feed links in the page header
 931          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
 932          * for the new version
 933          * @see addFeedLink()
 934          *
 935          * @param $show Boolean: true: add default feeds, false: remove all feeds
 936          */
 937         public function setSyndicated( $show = true ) {
 938                 if ( $show ) {
 939                         $this->setFeedAppendQuery( false );
 940                 } else {
 941                         $this->mFeedLinks = array();
 942                 }
 943         }
 944
 945         /**
 946          * Add default feeds to the page header
 947          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
 948          * for the new version
 949          * @see addFeedLink()
 950          *
 951          * @param $val String: query to append to feed links or false to output
 952          *        default links
 953          */
 954         public function setFeedAppendQuery( $val ) {
 955                 global $wgAdvertisedFeedTypes;
 956
 957                 $this->mFeedLinks = array();
 958
 959                 foreach ( $wgAdvertisedFeedTypes as $type ) {
 960                         $query = "feed=$type";
 961                         if ( is_string( $val ) ) {
 962                                 $query .= '&' . $val;
 963                         }
 964                         $this->mFeedLinks[$type] = $this->getTitle()->getLocalURL( $query );
 965                 }
 966         }
 967
 968         /**
 969          * Add a feed link to the page header
 970          *
 971          * @param $format String: feed type, should be a key of $wgFeedClasses
 972          * @param $href String: URL
 973          */
 974         public function addFeedLink( $format, $href ) {
 975                 global $wgAdvertisedFeedTypes;
 976
 977                 if ( in_array( $format, $wgAdvertisedFeedTypes ) ) {
 978                         $this->mFeedLinks[$format] = $href;
 979                 }
 980         }
 981
 982         /**
 983          * Should we output feed links for this page?
 984          * @return Boolean
 985          */
 986         public function isSyndicated() {
 987                 return count( $this->mFeedLinks ) > 0;
 988         }
 989
 990         /**
 991          * Return URLs for each supported syndication format for this page.
 992          * @return array associating format keys with URLs
 993          */
 994         public function getSyndicationLinks() {
 995                 return $this->mFeedLinks;
 996         }
 997
 998         /**
 999          * Will currently always return null
1000          *
1001          * @return null
1002          */
1003         public function getFeedAppendQuery() {
1004                 return $this->mFeedLinksAppendQuery;
1005         }
1006
1007         /**
1008          * Set whether the displayed content is related to the source of the
1009          * corresponding article on the wiki
1010          * Setting true will cause the change "article related" toggle to true
1011          *
1012          * @param $v Boolean
1013          */
1014         public function setArticleFlag( $v ) {
1015                 $this->mIsarticle = $v;
1016                 if ( $v ) {
1017                         $this->mIsArticleRelated = $v;
1018                 }
1019         }
1020
1021         /**
1022          * Return whether the content displayed page is related to the source of
1023          * the corresponding article on the wiki
1024          *
1025          * @return Boolean
1026          */
1027         public function isArticle() {
1028                 return $this->mIsarticle;
1029         }
1030
1031         /**
1032          * Set whether this page is related an article on the wiki
1033          * Setting false will cause the change of "article flag" toggle to false
1034          *
1035          * @param $v Boolean
1036          */
1037         public function setArticleRelated( $v ) {
1038                 $this->mIsArticleRelated = $v;
1039                 if ( !$v ) {
1040                         $this->mIsarticle = false;
1041                 }
1042         }
1043
1044         /**
1045          * Return whether this page is related an article on the wiki
1046          *
1047          * @return Boolean
1048          */
1049         public function isArticleRelated() {
1050                 return $this->mIsArticleRelated;
1051         }
1052
1053         /**
1054          * Add new language links
1055          *
1056          * @param $newLinkArray Associative array mapping language code to the page
1057          *                      name
1058          */
1059         public function addLanguageLinks( $newLinkArray ) {
1060                 $this->mLanguageLinks += $newLinkArray;
1061         }
1062
1063         /**
1064          * Reset the language links and add new language links
1065          *
1066          * @param $newLinkArray Associative array mapping language code to the page
1067          *                      name
1068          */
1069         public function setLanguageLinks( $newLinkArray ) {
1070                 $this->mLanguageLinks = $newLinkArray;
1071         }
1072
1073         /**
1074          * Get the list of language links
1075          *
1076          * @return Array of Interwiki Prefixed (non DB key) Titles (e.g. 'fr:Test page')
1077          */
1078         public function getLanguageLinks() {
1079                 return $this->mLanguageLinks;
1080         }
1081
1082         /**
1083          * Add an array of categories, with names in the keys
1084          *
1085          * @param $categories Array mapping category name => sort key
1086          */
1087         public function addCategoryLinks( $categories ) {
1088                 global $wgContLang;
1089
1090                 if ( !is_array( $categories ) || count( $categories ) == 0 ) {
1091                         return;
1092                 }
1093
1094                 # Add the links to a LinkBatch
1095                 $arr = array( NS_CATEGORY => $categories );
1096                 $lb = new LinkBatch;
1097                 $lb->setArray( $arr );
1098
1099                 # Fetch existence plus the hiddencat property
1100                 $dbr = wfGetDB( DB_SLAVE );
1101                 $res = $dbr->select( array( 'page', 'page_props' ),
1102                         array( 'page_id', 'page_namespace', 'page_title', 'page_len', 'page_is_redirect', 'page_latest', 'pp_value' ),
1103                         $lb->constructSet( 'page', $dbr ),
1104                         __METHOD__,
1105                         array(),
1106                         array( 'page_props' => array( 'LEFT JOIN', array( 'pp_propname' => 'hiddencat', 'pp_page = page_id' ) ) )
1107                 );
1108
1109                 # Add the results to the link cache
1110                 $lb->addResultToCache( LinkCache::singleton(), $res );
1111
1112                 # Set all the values to 'normal'. This can be done with array_fill_keys in PHP 5.2.0+
1113                 $categories = array_combine(
1114                         array_keys( $categories ),
1115                         array_fill( 0, count( $categories ), 'normal' )
1116                 );
1117
1118                 # Mark hidden categories
1119                 foreach ( $res as $row ) {
1120                         if ( isset( $row->pp_value ) ) {
1121                                 $categories[$row->page_title] = 'hidden';
1122                         }
1123                 }
1124
1125                 # Add the remaining categories to the skin
1126                 if ( wfRunHooks( 'OutputPageMakeCategoryLinks', array( &$this, $categories, &$this->mCategoryLinks ) ) ) {
1127                         foreach ( $categories as $category => $type ) {
1128                                 $origcategory = $category;
1129                                 $title = Title::makeTitleSafe( NS_CATEGORY, $category );
1130                                 $wgContLang->findVariantLink( $category, $title, true );
1131                                 if ( $category != $origcategory ) {
1132                                         if ( array_key_exists( $category, $categories ) ) {
1133                                                 continue;
1134                                         }
1135                                 }
1136                                 $text = $wgContLang->convertHtml( $title->getText() );
1137                                 $this->mCategories[] = $title->getText();
1138                                 $this->mCategoryLinks[$type][] = Linker::link( $title, $text );
1139                         }
1140                 }
1141         }
1142
1143         /**
1144          * Reset the category links (but not the category list) and add $categories
1145          *
1146          * @param $categories Array mapping category name => sort key
1147          */
1148         public function setCategoryLinks( $categories ) {
1149                 $this->mCategoryLinks = array();
1150                 $this->addCategoryLinks( $categories );
1151         }
1152
1153         /**
1154          * Get the list of category links, in a 2-D array with the following format:
1155          * $arr[$type][] = $link, where $type is either "normal" or "hidden" (for
1156          * hidden categories) and $link a HTML fragment with a link to the category
1157          * page
1158          *
1159          * @return Array
1160          */
1161         public function getCategoryLinks() {
1162                 return $this->mCategoryLinks;
1163         }
1164
1165         /**
1166          * Get the list of category names this page belongs to
1167          *
1168          * @return Array of strings
1169          */
1170         public function getCategories() {
1171                 return $this->mCategories;
1172         }
1173
1174         /**
1175          * Do not allow scripts which can be modified by wiki users to load on this page;
1176          * only allow scripts bundled with, or generated by, the software.
1177          */
1178         public function disallowUserJs() {
1179                 $this->reduceAllowedModules(
1180                         ResourceLoaderModule::TYPE_SCRIPTS,
1181                         ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL
1182                 );
1183         }
1184
1185         /**
1186          * Return whether user JavaScript is allowed for this page
1187          * @deprecated since 1.18 Load modules with ResourceLoader, and origin and
1188          *     trustworthiness is identified and enforced automagically.
1189          * @return Boolean
1190          */
1191         public function isUserJsAllowed() {
1192                 return $this->getAllowedModules( ResourceLoaderModule::TYPE_SCRIPTS ) >= ResourceLoaderModule::ORIGIN_USER_INDIVIDUAL;
1193         }
1194
1195         /**
1196          * Show what level of JavaScript / CSS untrustworthiness is allowed on this page
1197          * @see ResourceLoaderModule::$origin
1198          * @param $type String ResourceLoaderModule TYPE_ constant
1199          * @return Int ResourceLoaderModule ORIGIN_ class constant
1200          */
1201         public function getAllowedModules( $type ){
1202                 if( $type == ResourceLoaderModule::TYPE_COMBINED ){
1203                         return min( array_values( $this->mAllowedModules ) );
1204                 } else {
1205                         return isset( $this->mAllowedModules[$type] )
1206                                 ? $this->mAllowedModules[$type]
1207                                 : ResourceLoaderModule::ORIGIN_ALL;
1208                 }
1209         }
1210
1211         /**
1212          * Set the highest level of CSS/JS untrustworthiness allowed
1213          * @param  $type String ResourceLoaderModule TYPE_ constant
1214          * @param  $level Int ResourceLoaderModule class constant
1215          */
1216         public function setAllowedModules( $type, $level ){
1217                 $this->mAllowedModules[$type] = $level;
1218         }
1219
1220         /**
1221          * As for setAllowedModules(), but don't inadvertantly make the page more accessible
1222          * @param  $type String
1223          * @param  $level Int ResourceLoaderModule class constant
1224          */
1225         public function reduceAllowedModules( $type, $level ){
1226                 $this->mAllowedModules[$type] = min( $this->getAllowedModules($type), $level );
1227         }
1228
1229         /**
1230          * Prepend $text to the body HTML
1231          *
1232          * @param $text String: HTML
1233          */
1234         public function prependHTML( $text ) {
1235                 $this->mBodytext = $text . $this->mBodytext;
1236         }
1237
1238         /**
1239          * Append $text to the body HTML
1240          *
1241          * @param $text String: HTML
1242          */
1243         public function addHTML( $text ) {
1244                 $this->mBodytext .= $text;
1245         }
1246
1247         /**
1248          * Clear the body HTML
1249          */
1250         public function clearHTML() {
1251                 $this->mBodytext = '';
1252         }
1253
1254         /**
1255          * Get the body HTML
1256          *
1257          * @return String: HTML
1258          */
1259         public function getHTML() {
1260                 return $this->mBodytext;
1261         }
1262
1263         /**
1264          * Add $text to the debug output
1265          *
1266          * @param $text String: debug text
1267          */
1268         public function debug( $text ) {
1269                 $this->mDebugtext .= $text;
1270         }
1271
1272         /**
1273          * Get/set the ParserOptions object to use for wikitext parsing
1274          *
1275          * @param $options either the ParserOption to use or null to only get the
1276          *                 current ParserOption object
1277          * @return ParserOptions object
1278          */
1279         public function parserOptions( $options = null ) {
1280                 if ( !$this->mParserOptions ) {
1281                         $this->mParserOptions = new ParserOptions;
1282                         $this->mParserOptions->setEditSection( false );
1283                 }
1284                 return wfSetVar( $this->mParserOptions, $options );
1285         }
1286
1287         /**
1288          * Set the revision ID which will be seen by the wiki text parser
1289          * for things such as embedded {{REVISIONID}} variable use.
1290          *
1291          * @param $revid Mixed: an positive integer, or null
1292          * @return Mixed: previous value
1293          */
1294         public function setRevisionId( $revid ) {
1295                 $val = is_null( $revid ) ? null : intval( $revid );
1296                 return wfSetVar( $this->mRevisionId, $val );
1297         }
1298
1299         /**
1300          * Get the displayed revision ID
1301          *
1302          * @return Integer
1303          */
1304         public function getRevisionId() {
1305                 return $this->mRevisionId;
1306         }
1307
1308         /**
1309          * Set the displayed file version
1310          *
1311          * @param $file File|false
1312          * @return Mixed: previous value
1313          */
1314         public function setFileVersion( $file ) {
1315                 $val = null;
1316                 if ( $file instanceof File && $file->exists() ) {
1317                         $val = array( 'time' => $file->getTimestamp(), 'sha1' => $file->getSha1() );
1318                 }
1319                 return wfSetVar( $this->mFileVersion, $val, true );
1320         }
1321
1322         /**
1323          * Get the displayed file version
1324          *
1325          * @return Array|null ('time' => MW timestamp, 'sha1' => sha1)
1326          */
1327         public function getFileVersion() {
1328                 return $this->mFileVersion;
1329         }
1330
1331         /**
1332          * Get the templates used on this page
1333          *
1334          * @return Array (namespace => dbKey => revId)
1335          * @since 1.18
1336          */
1337         public function getTemplateIds() {
1338                 return $this->mTemplateIds;
1339         }
1340
1341         /**
1342          * Get the files used on this page
1343          *
1344          * @return Array (dbKey => array('time' => MW timestamp or null, 'sha1' => sha1 or ''))
1345          * @since 1.18
1346          */
1347         public function getImageTimeKeys() {
1348                 return $this->mImageTimeKeys;
1349         }
1350
1351         /**
1352          * Convert wikitext to HTML and add it to the buffer
1353          * Default assumes that the current page title will be used.
1354          *
1355          * @param $text String
1356          * @param $linestart Boolean: is this the start of a line?
1357          */
1358         public function addWikiText( $text, $linestart = true ) {
1359                 $title = $this->getTitle(); // Work arround E_STRICT
1360                 $this->addWikiTextTitle( $text, $title, $linestart );
1361         }
1362
1363         /**
1364          * Add wikitext with a custom Title object
1365          *
1366          * @param $text String: wikitext
1367          * @param $title Title object
1368          * @param $linestart Boolean: is this the start of a line?
1369          */
1370         public function addWikiTextWithTitle( $text, &$title, $linestart = true ) {
1371                 $this->addWikiTextTitle( $text, $title, $linestart );
1372         }
1373
1374         /**
1375          * Add wikitext with a custom Title object and
1376          *
1377          * @param $text String: wikitext
1378          * @param $title Title object
1379          * @param $linestart Boolean: is this the start of a line?
1380          */
1381         function addWikiTextTitleTidy( $text, &$title, $linestart = true ) {
1382                 $this->addWikiTextTitle( $text, $title, $linestart, true );
1383         }
1384
1385         /**
1386          * Add wikitext with tidy enabled
1387          *
1388          * @param $text String: wikitext
1389          * @param $linestart Boolean: is this the start of a line?
1390          */
1391         public function addWikiTextTidy( $text, $linestart = true ) {
1392                 $title = $this->getTitle();
1393                 $this->addWikiTextTitleTidy( $text, $title, $linestart );
1394         }
1395
1396         /**
1397          * Add wikitext with a custom Title object
1398          *
1399          * @param $text String: wikitext
1400          * @param $title Title object
1401          * @param $linestart Boolean: is this the start of a line?
1402          * @param $tidy Boolean: whether to use tidy
1403          */
1404         public function addWikiTextTitle( $text, &$title, $linestart, $tidy = false ) {
1405                 global $wgParser;
1406
1407                 wfProfileIn( __METHOD__ );
1408
1409                 wfIncrStats( 'pcache_not_possible' );
1410
1411                 $popts = $this->parserOptions();
1412                 $oldTidy = $popts->setTidy( $tidy );
1413
1414                 $parserOutput = $wgParser->parse(
1415                         $text, $title, $popts,
1416                         $linestart, true, $this->mRevisionId
1417                 );
1418
1419                 $popts->setTidy( $oldTidy );
1420
1421                 $this->addParserOutput( $parserOutput );
1422
1423                 wfProfileOut( __METHOD__ );
1424         }
1425
1426         /**
1427          * Add a ParserOutput object, but without Html
1428          *
1429          * @param $parserOutput ParserOutput object
1430          */
1431         public function addParserOutputNoText( &$parserOutput ) {
1432                 $this->mLanguageLinks += $parserOutput->getLanguageLinks();
1433                 $this->addCategoryLinks( $parserOutput->getCategories() );
1434                 $this->mNewSectionLink = $parserOutput->getNewSection();
1435                 $this->mHideNewSectionLink = $parserOutput->getHideNewSection();
1436
1437                 $this->mParseWarnings = $parserOutput->getWarnings();
1438                 if ( !$parserOutput->isCacheable() ) {
1439                         $this->enableClientCache( false );
1440                 }
1441                 $this->mNoGallery = $parserOutput->getNoGallery();
1442                 $this->mHeadItems = array_merge( $this->mHeadItems, $parserOutput->getHeadItems() );
1443                 $this->addModules( $parserOutput->getModules() );
1444
1445                 // Template versioning...
1446                 foreach ( (array)$parserOutput->getTemplateIds() as $ns => $dbks ) {
1447                         if ( isset( $this->mTemplateIds[$ns] ) ) {
1448                                 $this->mTemplateIds[$ns] = $dbks + $this->mTemplateIds[$ns];
1449                         } else {
1450                                 $this->mTemplateIds[$ns] = $dbks;
1451                         }
1452                 }
1453                 // File versioning...
1454                 foreach ( (array)$parserOutput->getImageTimeKeys() as $dbk => $data ) {
1455                         $this->mImageTimeKeys[$dbk] = $data;
1456                 }
1457
1458                 // Hooks registered in the object
1459                 global $wgParserOutputHooks;
1460                 foreach ( $parserOutput->getOutputHooks() as $hookInfo ) {
1461                         list( $hookName, $data ) = $hookInfo;
1462                         if ( isset( $wgParserOutputHooks[$hookName] ) ) {
1463                                 call_user_func( $wgParserOutputHooks[$hookName], $this, $parserOutput, $data );
1464                         }
1465                 }
1466
1467                 wfRunHooks( 'OutputPageParserOutput', array( &$this, $parserOutput ) );
1468         }
1469
1470         /**
1471          * Add a ParserOutput object
1472          *
1473          * @param $parserOutput ParserOutput
1474          */
1475         function addParserOutput( &$parserOutput ) {
1476                 $this->addParserOutputNoText( $parserOutput );
1477                 $text = $parserOutput->getText();
1478                 wfRunHooks( 'OutputPageBeforeHTML', array( &$this, &$text ) );
1479                 $this->addHTML( $text );
1480         }
1481
1482
1483         /**
1484          * Add the output of a QuickTemplate to the output buffer
1485          *
1486          * @param $template QuickTemplate
1487          */
1488         public function addTemplate( &$template ) {
1489                 ob_start();
1490                 $template->execute();
1491                 $this->addHTML( ob_get_contents() );
1492                 ob_end_clean();
1493         }
1494
1495         /**
1496          * Parse wikitext and return the HTML.
1497          *
1498          * @param $text String
1499          * @param $linestart Boolean: is this the start of a line?
1500          * @param $interface Boolean: use interface language ($wgLang instead of
1501          *                   $wgContLang) while parsing language sensitive magic
1502          *                   words like GRAMMAR and PLURAL
1503          * @param $language  Language object: target language object, will override
1504          *                   $interface
1505          * @return String: HTML
1506          */
1507         public function parse( $text, $linestart = true, $interface = false, $language = null ) {
1508                 // Check one for one common cause for parser state resetting
1509                 $callers = wfGetAllCallers( 10 );
1510                 if ( strpos( $callers, 'Parser::extensionSubstitution' ) !== false ) {
1511                         throw new MWException( "wfMsg* function with parsing cannot be used " .
1512                                 "inside a tag hook. Should use parser->recursiveTagParse() instead" );
1513                 }
1514
1515                 global $wgParser;
1516
1517                 if( is_null( $this->getTitle() ) ) {
1518                         throw new MWException( 'Empty $mTitle in ' . __METHOD__ );
1519                 }
1520
1521                 $popts = $this->parserOptions();
1522                 if ( $interface ) {
1523                         $popts->setInterfaceMessage( true );
1524                 }
1525                 if ( $language !== null ) {
1526                         $oldLang = $popts->setTargetLanguage( $language );
1527                 }
1528
1529                 $parserOutput = $wgParser->parse(
1530                         $text, $this->getTitle(), $popts,
1531                         $linestart, true, $this->mRevisionId
1532                 );
1533
1534                 if ( $interface ) {
1535                         $popts->setInterfaceMessage( false );
1536                 }
1537                 if ( $language !== null ) {
1538                         $popts->setTargetLanguage( $oldLang );
1539                 }
1540
1541                 return $parserOutput->getText();
1542         }
1543
1544         /**
1545          * Parse wikitext, strip paragraphs, and return the HTML.
1546          *
1547          * @param $text String
1548          * @param $linestart Boolean: is this the start of a line?
1549          * @param $interface Boolean: use interface language ($wgLang instead of
1550          *                   $wgContLang) while parsing language sensitive magic
1551          *                   words like GRAMMAR and PLURAL
1552          * @return String: HTML
1553          */
1554         public function parseInline( $text, $linestart = true, $interface = false ) {
1555                 $parsed = $this->parse( $text, $linestart, $interface );
1556
1557                 $m = array();
1558                 if ( preg_match( '/^<p>(.*)\n?<\/p>\n?/sU', $parsed, $m ) ) {
1559                         $parsed = $m[1];
1560                 }
1561
1562                 return $parsed;
1563         }
1564
1565         /**
1566          * Set the value of the "s-maxage" part of the "Cache-control" HTTP header
1567          *
1568          * @param $maxage Integer: maximum cache time on the Squid, in seconds.
1569          */
1570         public function setSquidMaxage( $maxage ) {
1571                 $this->mSquidMaxage = $maxage;
1572         }
1573
1574         /**
1575          * Use enableClientCache(false) to force it to send nocache headers
1576          *
1577          * @param $state bool
1578          *
1579          * @return bool
1580          */
1581         public function enableClientCache( $state ) {
1582                 return wfSetVar( $this->mEnableClientCache, $state );
1583         }
1584
1585         /**
1586          * Get the list of cookies that will influence on the cache
1587          *
1588          * @return Array
1589          */
1590         function getCacheVaryCookies() {
1591                 global $wgCookiePrefix, $wgCacheVaryCookies;
1592                 static $cookies;
1593                 if ( $cookies === null ) {
1594                         $cookies = array_merge(
1595                                 array(
1596                                         "{$wgCookiePrefix}Token",
1597                                         "{$wgCookiePrefix}LoggedOut",
1598                                         session_name()
1599                                 ),
1600                                 $wgCacheVaryCookies
1601                         );
1602                         wfRunHooks( 'GetCacheVaryCookies', array( $this, &$cookies ) );
1603                 }
1604                 return $cookies;
1605         }
1606
1607         /**
1608          * Return whether this page is not cacheable because "useskin" or "uselang"
1609          * URL parameters were passed.
1610          *
1611          * @return Boolean
1612          */
1613         function uncacheableBecauseRequestVars() {
1614                 $request = $this->getRequest();
1615                 return $request->getText( 'useskin', false ) === false
1616                         && $request->getText( 'uselang', false ) === false;
1617         }
1618
1619         /**
1620          * Check if the request has a cache-varying cookie header
1621          * If it does, it's very important that we don't allow public caching
1622          *
1623          * @return Boolean
1624          */
1625         function haveCacheVaryCookies() {
1626                 $cookieHeader = $this->getRequest()->getHeader( 'cookie' );
1627                 if ( $cookieHeader === false ) {
1628                         return false;
1629                 }
1630                 $cvCookies = $this->getCacheVaryCookies();
1631                 foreach ( $cvCookies as $cookieName ) {
1632                         # Check for a simple string match, like the way squid does it
1633                         if ( strpos( $cookieHeader, $cookieName ) !== false ) {
1634                                 wfDebug( __METHOD__ . ": found $cookieName\n" );
1635                                 return true;
1636                         }
1637                 }
1638                 wfDebug( __METHOD__ . ": no cache-varying cookies found\n" );
1639                 return false;
1640         }
1641
1642         /**
1643          * Add an HTTP header that will influence on the cache
1644          *
1645          * @param $header String: header name
1646          * @param $option Array|null
1647          * @todo FIXME: Document the $option parameter; it appears to be for
1648          *        X-Vary-Options but what format is acceptable?
1649          */
1650         public function addVaryHeader( $header, $option = null ) {
1651                 if ( !array_key_exists( $header, $this->mVaryHeader ) ) {
1652                         $this->mVaryHeader[$header] = (array)$option;
1653                 } elseif( is_array( $option ) ) {
1654                         if( is_array( $this->mVaryHeader[$header] ) ) {
1655                                 $this->mVaryHeader[$header] = array_merge( $this->mVaryHeader[$header], $option );
1656                         } else {
1657                                 $this->mVaryHeader[$header] = $option;
1658                         }
1659                 }
1660                 $this->mVaryHeader[$header] = array_unique( $this->mVaryHeader[$header] );
1661         }
1662
1663         /**
1664          * Get a complete X-Vary-Options header
1665          *
1666          * @return String
1667          */
1668         public function getXVO() {
1669                 $cvCookies = $this->getCacheVaryCookies();
1670
1671                 $cookiesOption = array();
1672                 foreach ( $cvCookies as $cookieName ) {
1673                         $cookiesOption[] = 'string-contains=' . $cookieName;
1674                 }
1675                 $this->addVaryHeader( 'Cookie', $cookiesOption );
1676
1677                 $headers = array();
1678                 foreach( $this->mVaryHeader as $header => $option ) {
1679                         $newheader = $header;
1680                         if( is_array( $option ) ) {
1681                                 $newheader .= ';' . implode( ';', $option );
1682                         }
1683                         $headers[] = $newheader;
1684                 }
1685                 $xvo = 'X-Vary-Options: ' . implode( ',', $headers );
1686
1687                 return $xvo;
1688         }
1689
1690         /**
1691          * bug 21672: Add Accept-Language to Vary and XVO headers
1692          * if there's no 'variant' parameter existed in GET.
1693          *
1694          * For example:
1695          *   /w/index.php?title=Main_page should always be served; but
1696          *   /w/index.php?title=Main_page&variant=zh-cn should never be served.
1697          */
1698         function addAcceptLanguage() {
1699                 global $wgContLang;
1700                 if( !$this->getRequest()->getCheck( 'variant' ) && $wgContLang->hasVariants() ) {
1701                         $variants = $wgContLang->getVariants();
1702                         $aloption = array();
1703                         foreach ( $variants as $variant ) {
1704                                 if( $variant === $wgContLang->getCode() ) {
1705                                         continue;
1706                                 } else {
1707                                         $aloption[] = 'string-contains=' . $variant;
1708
1709                                         // IE and some other browsers use another form of language code
1710                                         // in their Accept-Language header, like "zh-CN" or "zh-TW".
1711                                         // We should handle these too.
1712                                         $ievariant = explode( '-', $variant );
1713                                         if ( count( $ievariant ) == 2 ) {
1714                                                 $ievariant[1] = strtoupper( $ievariant[1] );
1715                                                 $ievariant = implode( '-', $ievariant );
1716                                                 $aloption[] = 'string-contains=' . $ievariant;
1717                                         }
1718                                 }
1719                         }
1720                         $this->addVaryHeader( 'Accept-Language', $aloption );
1721                 }
1722         }
1723
1724         /**
1725          * Set a flag which will cause an X-Frame-Options header appropriate for
1726          * edit pages to be sent. The header value is controlled by
1727          * $wgEditPageFrameOptions.
1728          *
1729          * This is the default for special pages. If you display a CSRF-protected
1730          * form on an ordinary view page, then you need to call this function.
1731          *
1732          * @param $enable bool
1733          */
1734         public function preventClickjacking( $enable = true ) {
1735                 $this->mPreventClickjacking = $enable;
1736         }
1737
1738         /**
1739          * Turn off frame-breaking. Alias for $this->preventClickjacking(false).
1740          * This can be called from pages which do not contain any CSRF-protected
1741          * HTML form.
1742          */
1743         public function allowClickjacking() {
1744                 $this->mPreventClickjacking = false;
1745         }
1746
1747         /**
1748          * Get the X-Frame-Options header value (without the name part), or false
1749          * if there isn't one. This is used by Skin to determine whether to enable
1750          * JavaScript frame-breaking, for clients that don't support X-Frame-Options.
1751          *
1752          * @return string
1753          */
1754         public function getFrameOptions() {
1755                 global $wgBreakFrames, $wgEditPageFrameOptions;
1756                 if ( $wgBreakFrames ) {
1757                         return 'DENY';
1758                 } elseif ( $this->mPreventClickjacking && $wgEditPageFrameOptions ) {
1759                         return $wgEditPageFrameOptions;
1760                 }
1761         }
1762
1763         /**
1764          * Send cache control HTTP headers
1765          */
1766         public function sendCacheControl() {
1767                 global $wgUseSquid, $wgUseESI, $wgUseETag, $wgSquidMaxage, $wgUseXVO;
1768
1769                 $response = $this->getRequest()->response();
1770                 if ( $wgUseETag && $this->mETag ) {
1771                         $response->header( "ETag: $this->mETag" );
1772                 }
1773
1774                 $this->addAcceptLanguage();
1775
1776                 # don't serve compressed data to clients who can't handle it
1777                 # maintain different caches for logged-in users and non-logged in ones
1778                 $response->header( 'Vary: ' . join( ', ', array_keys( $this->mVaryHeader ) ) );
1779
1780                 if ( $wgUseXVO ) {
1781                         # Add an X-Vary-Options header for Squid with Wikimedia patches
1782                         $response->header( $this->getXVO() );
1783                 }
1784
1785                 if( !$this->uncacheableBecauseRequestVars() && $this->mEnableClientCache ) {
1786                         if(
1787                                 $wgUseSquid && session_id() == '' && !$this->isPrintable() &&
1788                                 $this->mSquidMaxage != 0 && !$this->haveCacheVaryCookies()
1789                         )
1790                         {
1791                                 if ( $wgUseESI ) {
1792                                         # We'll purge the proxy cache explicitly, but require end user agents
1793                                         # to revalidate against the proxy on each visit.
1794                                         # Surrogate-Control controls our Squid, Cache-Control downstream caches
1795                                         wfDebug( __METHOD__ . ": proxy caching with ESI; {$this->mLastModified} **\n", false );
1796                                         # start with a shorter timeout for initial testing
1797                                         # header( 'Surrogate-Control: max-age=2678400+2678400, content="ESI/1.0"');
1798                                         $response->header( 'Surrogate-Control: max-age='.$wgSquidMaxage.'+'.$this->mSquidMaxage.', content="ESI/1.0"');
1799                                         $response->header( 'Cache-Control: s-maxage=0, must-revalidate, max-age=0' );
1800                                 } else {
1801                                         # We'll purge the proxy cache for anons explicitly, but require end user agents
1802                                         # to revalidate against the proxy on each visit.
1803                                         # IMPORTANT! The Squid needs to replace the Cache-Control header with
1804                                         # Cache-Control: s-maxage=0, must-revalidate, max-age=0
1805                                         wfDebug( __METHOD__ . ": local proxy caching; {$this->mLastModified} **\n", false );
1806                                         # start with a shorter timeout for initial testing
1807                                         # header( "Cache-Control: s-maxage=2678400, must-revalidate, max-age=0" );
1808                                         $response->header( 'Cache-Control: s-maxage='.$this->mSquidMaxage.', must-revalidate, max-age=0' );
1809                                 }
1810                         } else {
1811                                 # We do want clients to cache if they can, but they *must* check for updates
1812                                 # on revisiting the page.
1813                                 wfDebug( __METHOD__ . ": private caching; {$this->mLastModified} **\n", false );
1814                                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1815                                 $response->header( "Cache-Control: private, must-revalidate, max-age=0" );
1816                         }
1817                         if($this->mLastModified) {
1818                                 $response->header( "Last-Modified: {$this->mLastModified}" );
1819                         }
1820                 } else {
1821                         wfDebug( __METHOD__ . ": no caching **\n", false );
1822
1823                         # In general, the absence of a last modified header should be enough to prevent
1824                         # the client from using its cache. We send a few other things just to make sure.
1825                         $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1826                         $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
1827                         $response->header( 'Pragma: no-cache' );
1828                 }
1829         }
1830
1831         /**
1832          * Get the message associed with the HTTP response code $code
1833          *
1834          * @param $code Integer: status code
1835          * @return String or null: message or null if $code is not in the list of
1836          *         messages
1837          *
1838          * @deprecated since 1.18 Use HttpStatus::getMessage() instead.
1839          */
1840         public static function getStatusMessage( $code ) {
1841                 wfDeprecated( __METHOD__ );
1842                 return HttpStatus::getMessage( $code );
1843         }
1844
1845         /**
1846          * Finally, all the text has been munged and accumulated into
1847          * the object, let's actually output it:
1848          */
1849         public function output() {
1850                 global $wgLanguageCode, $wgDebugRedirects, $wgMimeType;
1851
1852                 if( $this->mDoNothing ) {
1853                         return;
1854                 }
1855
1856                 wfProfileIn( __METHOD__ );
1857
1858                 $response = $this->getRequest()->response();
1859
1860                 if ( $this->mRedirect != '' ) {
1861                         # Standards require redirect URLs to be absolute
1862                         $this->mRedirect = wfExpandUrl( $this->mRedirect );
1863                         if( $this->mRedirectCode == '301' || $this->mRedirectCode == '303' ) {
1864                                 if( !$wgDebugRedirects ) {
1865                                         $message = HttpStatus::getMessage( $this->mRedirectCode );
1866                                         $response->header( "HTTP/1.1 {$this->mRedirectCode} $message" );
1867                                 }
1868                                 $this->mLastModified = wfTimestamp( TS_RFC2822 );
1869                         }
1870                         $this->sendCacheControl();
1871
1872                         $response->header( "Content-Type: text/html; charset=utf-8" );
1873                         if( $wgDebugRedirects ) {
1874                                 $url = htmlspecialchars( $this->mRedirect );
1875                                 print "<html>\n<head>\n<title>Redirect</title>\n</head>\n<body>\n";
1876                                 print "<p>Location: <a href=\"$url\">$url</a></p>\n";
1877                                 print "</body>\n</html>\n";
1878                         } else {
1879                                 $response->header( 'Location: ' . $this->mRedirect );
1880                         }
1881                         wfProfileOut( __METHOD__ );
1882                         return;
1883                 } elseif ( $this->mStatusCode ) {
1884                         $message = HttpStatus::getMessage( $this->mStatusCode );
1885                         if ( $message ) {
1886                                 $response->header( 'HTTP/1.1 ' . $this->mStatusCode . ' ' . $message );
1887                         }
1888                 }
1889
1890                 # Buffer output; final headers may depend on later processing
1891                 ob_start();
1892
1893                 $response->header( "Content-type: $wgMimeType; charset=UTF-8" );
1894                 $response->header( 'Content-language: ' . $wgLanguageCode );
1895
1896                 // Prevent framing, if requested
1897                 $frameOptions = $this->getFrameOptions();
1898                 if ( $frameOptions ) {
1899                         $response->header( "X-Frame-Options: $frameOptions" );
1900                 }
1901
1902                 if ( $this->mArticleBodyOnly ) {
1903                         $this->out( $this->mBodytext );
1904                 } else {
1905                         $this->addDefaultModules();
1906
1907                         $sk = $this->getSkin();
1908
1909                         // Hook that allows last minute changes to the output page, e.g.
1910                         // adding of CSS or Javascript by extensions.
1911                         wfRunHooks( 'BeforePageDisplay', array( &$this, &$sk ) );
1912
1913                         wfProfileIn( 'Output-skin' );
1914                         $sk->outputPage( $this );
1915                         wfProfileOut( 'Output-skin' );
1916                 }
1917
1918                 $this->sendCacheControl();
1919                 ob_end_flush();
1920                 wfProfileOut( __METHOD__ );
1921         }
1922
1923         /**
1924          * Actually output something with print().
1925          *
1926          * @param $ins String: the string to output
1927          */
1928         public function out( $ins ) {
1929                 print $ins;
1930         }
1931
1932         /**
1933          * Produce a "user is blocked" page.
1934          * @deprecated since 1.18
1935          */
1936         function blockedPage() {
1937                 throw new UserBlockedError( $this->getUser()->mBlock );
1938         }
1939
1940         /**
1941          * Output a standard error page
1942          *
1943          * @param $title String: message key for page title
1944          * @param $msg String: message key for page text
1945          * @param $params Array: message parameters
1946          */
1947         public function showErrorPage( $title, $msg, $params = array() ) {
1948                 if ( $this->getTitle() ) {
1949                         $this->mDebugtext .= 'Original title: ' . $this->getTitle()->getPrefixedText() . "\n";
1950                 }
1951                 $this->setPageTitle( wfMsg( $title ) );
1952                 $this->setHTMLTitle( wfMsg( 'errorpagetitle' ) );
1953                 $this->setRobotPolicy( 'noindex,nofollow' );
1954                 $this->setArticleRelated( false );
1955                 $this->enableClientCache( false );
1956                 $this->mRedirect = '';
1957                 $this->mBodytext = '';
1958
1959                 $this->addWikiMsgArray( $msg, $params );
1960
1961                 $this->returnToMain();
1962         }
1963
1964         /**
1965          * Output a standard permission error page
1966          *
1967          * @param $errors Array: error message keys
1968          * @param $action String: action that was denied or null if unknown
1969          */
1970         public function showPermissionsErrorPage( $errors, $action = null ) {
1971                 $this->mDebugtext .= 'Original title: ' .
1972                 $this->getTitle()->getPrefixedText() . "\n";
1973                 $this->setPageTitle( wfMsg( 'permissionserrors' ) );
1974                 $this->setHTMLTitle( wfMsg( 'permissionserrors' ) );
1975                 $this->setRobotPolicy( 'noindex,nofollow' );
1976                 $this->setArticleRelated( false );
1977                 $this->enableClientCache( false );
1978                 $this->mRedirect = '';
1979                 $this->mBodytext = '';
1980                 $this->addWikiText( $this->formatPermissionsErrorMessage( $errors, $action ) );
1981         }
1982
1983         /**
1984          * Display an error page indicating that a given version of MediaWiki is
1985          * required to use it
1986          *
1987          * @param $version Mixed: the version of MediaWiki needed to use the page
1988          */
1989         public function versionRequired( $version ) {
1990                 $this->setPageTitle( wfMsg( 'versionrequired', $version ) );
1991                 $this->setHTMLTitle( wfMsg( 'versionrequired', $version ) );
1992                 $this->setRobotPolicy( 'noindex,nofollow' );
1993                 $this->setArticleRelated( false );
1994                 $this->mBodytext = '';
1995
1996                 $this->addWikiMsg( 'versionrequiredtext', $version );
1997                 $this->returnToMain();
1998         }
1999
2000         /**
2001          * Display an error page noting that a given permission bit is required.
2002          * @deprecated since 1.18, just throw the exception directly
2003          * @param $permission String: key required
2004          */
2005         public function permissionRequired( $permission ) {
2006                 throw new PermissionsError( $permission );
2007         }
2008
2009         /**
2010          * Produce the stock "please login to use the wiki" page
2011          */
2012         public function loginToUse() {
2013                 if( $this->getUser()->isLoggedIn() ) {
2014                         throw new PermissionsError( 'read' );
2015                 }
2016
2017                 $this->setPageTitle( wfMsg( 'loginreqtitle' ) );
2018                 $this->setHtmlTitle( wfMsg( 'errorpagetitle' ) );
2019                 $this->setRobotPolicy( 'noindex,nofollow' );
2020                 $this->setArticleRelated( false );
2021
2022                 $loginTitle = SpecialPage::getTitleFor( 'Userlogin' );
2023                 $loginLink = Linker::linkKnown(
2024                         $loginTitle,
2025                         wfMsgHtml( 'loginreqlink' ),
2026                         array(),
2027                         array( 'returnto' => $this->getTitle()->getPrefixedText() )
2028                 );
2029                 $this->addHTML( wfMessage( 'loginreqpagetext' )->rawParams( $loginLink )->parse() .
2030                         "\n<!--" . $this->getTitle()->getPrefixedUrl() . '-->' );
2031
2032                 # Don't return to the main page if the user can't read it
2033                 # otherwise we'll end up in a pointless loop
2034                 $mainPage = Title::newMainPage();
2035                 if( $mainPage->userCanRead() ) {
2036                         $this->returnToMain( null, $mainPage );
2037                 }
2038         }
2039
2040         /**
2041          * Format a list of error messages
2042          *
2043          * @param $errors Array of arrays returned by Title::getUserPermissionsErrors
2044          * @param $action String: action that was denied or null if unknown
2045          * @return String: the wikitext error-messages, formatted into a list.
2046          */
2047         public function formatPermissionsErrorMessage( $errors, $action = null ) {
2048                 if ( $action == null ) {
2049                         $text = wfMsgNoTrans( 'permissionserrorstext', count( $errors ) ) . "\n\n";
2050                 } else {
2051                         $action_desc = wfMsgNoTrans( "action-$action" );
2052                         $text = wfMsgNoTrans(
2053                                 'permissionserrorstext-withaction',
2054                                 count( $errors ),
2055                                 $action_desc
2056                         ) . "\n\n";
2057                 }
2058
2059                 if ( count( $errors ) > 1 ) {
2060                         $text .= '<ul class="permissions-errors">' . "\n";
2061
2062                         foreach( $errors as $error ) {
2063                                 $text .= '<li>';
2064                                 $text .= call_user_func_array( 'wfMsgNoTrans', $error );
2065                                 $text .= "</li>\n";
2066                         }
2067                         $text .= '</ul>';
2068                 } else {
2069                         $text .= "<div class=\"permissions-errors\">\n" .
2070                                         call_user_func_array( 'wfMsgNoTrans', reset( $errors ) ) .
2071                                         "\n</div>";
2072                 }
2073
2074                 return $text;
2075         }
2076
2077         /**
2078          * Display a page stating that the Wiki is in read-only mode,
2079          * and optionally show the source of the page that the user
2080          * was trying to edit.  Should only be called (for this
2081          * purpose) after wfReadOnly() has returned true.
2082          *
2083          * For historical reasons, this function is _also_ used to
2084          * show the error message when a user tries to edit a page
2085          * they are not allowed to edit.  (Unless it's because they're
2086          * blocked, then we show blockedPage() instead.)  In this
2087          * case, the second parameter should be set to true and a list
2088          * of reasons supplied as the third parameter.
2089          *
2090          * @todo Needs to be split into multiple functions.
2091          *
2092          * @param $source    String: source code to show (or null).
2093          * @param $protected Boolean: is this a permissions error?
2094          * @param $reasons   Array: list of reasons for this error, as returned by Title::getUserPermissionsErrors().
2095          * @param $action    String: action that was denied or null if unknown
2096          */
2097         public function readOnlyPage( $source = null, $protected = false, $reasons = array(), $action = null ) {
2098                 $this->setRobotPolicy( 'noindex,nofollow' );
2099                 $this->setArticleRelated( false );
2100
2101                 // If no reason is given, just supply a default "I can't let you do
2102                 // that, Dave" message.  Should only occur if called by legacy code.
2103                 if ( $protected && empty( $reasons ) ) {
2104                         $reasons[] = array( 'badaccess-group0' );
2105                 }
2106
2107                 if ( !empty( $reasons ) ) {
2108                         // Permissions error
2109                         if( $source ) {
2110                                 $this->setPageTitle( wfMsg( 'viewsource' ) );
2111                                 $this->setSubtitle(
2112                                         wfMsg( 'viewsourcefor', Linker::linkKnown( $this->getTitle() ) )
2113                                 );
2114                         } else {
2115                                 $this->setPageTitle( wfMsg( 'badaccess' ) );
2116                         }
2117                         $this->addWikiText( $this->formatPermissionsErrorMessage( $reasons, $action ) );
2118                 } else {
2119                         // Wiki is read only
2120                         throw new ReadOnlyError;
2121                 }
2122
2123                 // Show source, if supplied
2124                 if( is_string( $source ) ) {
2125                         $this->addWikiMsg( 'viewsourcetext' );
2126
2127                         $params = array(
2128                                 'id'   => 'wpTextbox1',
2129                                 'name' => 'wpTextbox1',
2130                                 'cols' => $this->getUser()->getOption( 'cols' ),
2131                                 'rows' => $this->getUser()->getOption( 'rows' ),
2132                                 'readonly' => 'readonly'
2133                         );
2134                         $this->addHTML( Html::element( 'textarea', $params, $source ) );
2135
2136                         // Show templates used by this article
2137                         $article = new Article( $this->getTitle() );
2138                         $templates = Linker::formatTemplates( $article->getUsedTemplates() );
2139                         $this->addHTML( "<div class='templatesUsed'>
2140 $templates
2141 </div>
2142 " );
2143                 }
2144
2145                 # If the title doesn't exist, it's fairly pointless to print a return
2146                 # link to it.  After all, you just tried editing it and couldn't, so
2147                 # what's there to do there?
2148                 if( $this->getTitle()->exists() ) {
2149                         $this->returnToMain( null, $this->getTitle() );
2150                 }
2151         }
2152
2153         /**
2154          * Turn off regular page output and return an error reponse
2155          * for when rate limiting has triggered.
2156          */
2157         public function rateLimited() {
2158                 throw new ThrottledError;
2159         }
2160
2161         /**
2162          * Show a warning about slave lag
2163          *
2164          * If the lag is higher than $wgSlaveLagCritical seconds,
2165          * then the warning is a bit more obvious. If the lag is
2166          * lower than $wgSlaveLagWarning, then no warning is shown.
2167          *
2168          * @param $lag Integer: slave lag
2169          */
2170         public function showLagWarning( $lag ) {
2171                 global $wgSlaveLagWarning, $wgSlaveLagCritical;
2172                 if( $lag >= $wgSlaveLagWarning ) {
2173                         $message = $lag < $wgSlaveLagCritical
2174                                 ? 'lag-warn-normal'
2175                                 : 'lag-warn-high';
2176                         $wrap = Html::rawElement( 'div', array( 'class' => "mw-{$message}" ), "\n$1\n" );
2177                         $this->wrapWikiMsg( "$wrap\n", array( $message, $this->getContext()->getLang()->formatNum( $lag ) ) );
2178                 }
2179         }
2180
2181         public function showFatalError( $message ) {
2182                 $this->setPageTitle( wfMsg( 'internalerror' ) );
2183                 $this->setRobotPolicy( 'noindex,nofollow' );
2184                 $this->setArticleRelated( false );
2185                 $this->enableClientCache( false );
2186                 $this->mRedirect = '';
2187                 $this->mBodytext = $message;
2188         }
2189
2190         public function showUnexpectedValueError( $name, $val ) {
2191                 $this->showFatalError( wfMsg( 'unexpected', $name, $val ) );
2192         }
2193
2194         public function showFileCopyError( $old, $new ) {
2195                 $this->showFatalError( wfMsg( 'filecopyerror', $old, $new ) );
2196         }
2197
2198         public function showFileRenameError( $old, $new ) {
2199                 $this->showFatalError( wfMsg( 'filerenameerror', $old, $new ) );
2200         }
2201
2202         public function showFileDeleteError( $name ) {
2203                 $this->showFatalError( wfMsg( 'filedeleteerror', $name ) );
2204         }
2205
2206         public function showFileNotFoundError( $name ) {
2207                 $this->showFatalError( wfMsg( 'filenotfound', $name ) );
2208         }
2209
2210         /**
2211          * Add a "return to" link pointing to a specified title
2212          *
2213          * @param $title Title to link
2214          * @param $query String query string
2215          * @param $text String text of the link (input is not escaped)
2216          */
2217         public function addReturnTo( $title, $query = array(), $text = null ) {
2218                 $this->addLink( array( 'rel' => 'next', 'href' => $title->getFullURL() ) );
2219                 $link = wfMsgHtml(
2220                         'returnto',
2221                         Linker::link( $title, $text, array(), $query )
2222                 );
2223                 $this->addHTML( "<p id=\"mw-returnto\">{$link}</p>\n" );
2224         }
2225
2226         /**
2227          * Add a "return to" link pointing to a specified title,
2228          * or the title indicated in the request, or else the main page
2229          *
2230          * @param $unused No longer used
2231          * @param $returnto Title or String to return to
2232          * @param $returntoquery String: query string for the return to link
2233          */
2234         public function returnToMain( $unused = null, $returnto = null, $returntoquery = null ) {
2235                 if ( $returnto == null ) {
2236                         $returnto = $this->getRequest()->getText( 'returnto' );
2237                 }
2238
2239                 if ( $returntoquery == null ) {
2240                         $returntoquery = $this->getRequest()->getText( 'returntoquery' );
2241                 }
2242
2243                 if ( $returnto === '' ) {
2244                         $returnto = Title::newMainPage();
2245                 }
2246
2247                 if ( is_object( $returnto ) ) {
2248                         $titleObj = $returnto;
2249                 } else {
2250                         $titleObj = Title::newFromText( $returnto );
2251                 }
2252                 if ( !is_object( $titleObj ) ) {
2253                         $titleObj = Title::newMainPage();
2254                 }
2255
2256                 $this->addReturnTo( $titleObj, $returntoquery );
2257         }
2258
2259         /**
2260          * @param $sk Skin The given Skin
2261          * @param $includeStyle Boolean: unused
2262          * @return String: The doctype, opening <html>, and head element.
2263          */
2264         public function headElement( Skin $sk, $includeStyle = true ) {
2265                 global $wgLang, $wgContLang, $wgUseTrackbacks;
2266                 $userdir = $wgLang->getDir();
2267                 $sitedir = $wgContLang->getDir();
2268
2269                 if ( $sk->commonPrintStylesheet() ) {
2270                         $this->addModuleStyles( 'mediawiki.legacy.wikiprintable' );
2271                 }
2272
2273                 $ret = Html::htmlHeader( array( 'lang' => $wgLang->getCode(), 'dir' => $userdir ) );
2274
2275                 if ( $this->getHTMLTitle() == '' ) {
2276                         $this->setHTMLTitle( wfMsg( 'pagetitle', $this->getPageTitle() ) );
2277                 }
2278
2279                 $openHead = Html::openElement( 'head' );
2280                 if ( $openHead ) {
2281                         # Don't bother with the newline if $head == ''
2282                         $ret .= "$openHead\n";
2283                 }
2284
2285                 $ret .= Html::element( 'title', null, $this->getHTMLTitle() ) . "\n";
2286
2287                 $ret .= implode( "\n", array(
2288                         $this->getHeadLinks( null, true ),
2289                         $this->buildCssLinks(),
2290                         $this->getHeadScripts(),
2291                         $this->getHeadItems()
2292                 ) );
2293
2294                 if ( $wgUseTrackbacks && $this->isArticleRelated() ) {
2295                         $ret .= $this->getTitle()->trackbackRDF();
2296                 }
2297
2298                 $closeHead = Html::closeElement( 'head' );
2299                 if ( $closeHead ) {
2300                         $ret .= "$closeHead\n";
2301                 }
2302
2303                 $bodyAttrs = array();
2304
2305                 # Crazy edit-on-double-click stuff
2306                 $action = $this->getRequest()->getVal( 'action', 'view' );
2307
2308                 if (
2309                         $this->getTitle()->getNamespace() != NS_SPECIAL &&
2310                         in_array( $action, array( 'view', 'purge' ) ) &&
2311                         $this->getUser()->getOption( 'editondblclick' )
2312                 )
2313                 {
2314                         $editUrl = $this->getTitle()->getLocalUrl( $sk->editUrlOptions() );
2315                         $bodyAttrs['ondblclick'] = "document.location = '" .
2316                                 Xml::escapeJsString( $editUrl ) . "'";
2317                 }
2318
2319                 # Classes for LTR/RTL directionality support
2320                 $bodyAttrs['class'] = "mediawiki $userdir sitedir-$sitedir";
2321
2322                 if ( $this->getContext()->getLang()->capitalizeAllNouns() ) {
2323                         # A <body> class is probably not the best way to do this . . .
2324                         $bodyAttrs['class'] .= ' capitalize-all-nouns';
2325                 }
2326                 $bodyAttrs['class'] .= ' ' . $sk->getPageClasses( $this->getTitle() );
2327                 $bodyAttrs['class'] .= ' skin-' . Sanitizer::escapeClass( $sk->getSkinName() );
2328
2329                 $sk->addToBodyAttributes( $this, $bodyAttrs ); // Allow skins to add body attributes they need
2330                 wfRunHooks( 'OutputPageBodyAttributes', array( $this, $sk, &$bodyAttrs ) );
2331
2332                 $ret .= Html::openElement( 'body', $bodyAttrs ) . "\n";
2333
2334                 return $ret;
2335         }
2336
2337         /**
2338          * Add the default ResourceLoader modules to this object
2339          */
2340         private function addDefaultModules() {
2341                 global $wgIncludeLegacyJavaScript, $wgUseAjax,
2342                         $wgAjaxWatch, $wgEnableMWSuggest, $wgUseAJAXCategories;
2343
2344                 // Add base resources
2345                 $this->addModules( array(
2346                         'mediawiki.user',
2347                         'mediawiki.util',
2348                         'mediawiki.page.startup',
2349                         'mediawiki.page.ready',
2350                 ) );
2351                 if ( $wgIncludeLegacyJavaScript ){
2352                         $this->addModules( 'mediawiki.legacy.wikibits' );
2353                 }
2354
2355                 // Add various resources if required
2356                 if ( $wgUseAjax ) {
2357                         $this->addModules( 'mediawiki.legacy.ajax' );
2358
2359                         wfRunHooks( 'AjaxAddScript', array( &$this ) );
2360
2361                         if( $wgAjaxWatch && $this->getUser()->isLoggedIn() ) {
2362                                 $this->addModules( 'mediawiki.action.watch.ajax' );
2363                         }
2364
2365                         if ( $wgEnableMWSuggest && !$this->getUser()->getOption( 'disablesuggest', false ) ) {
2366                                 $this->addModules( 'mediawiki.page.mwsuggest' );
2367                         }
2368                 }
2369
2370                 if ( $this->getUser()->getBoolOption( 'editsectiononrightclick' ) ) {
2371                         $this->addModules( 'mediawiki.action.view.rightClickEdit' );
2372                 }
2373
2374                 if ( $wgUseAJAXCategories ) {
2375                         global $wgAJAXCategoriesNamespaces;
2376
2377                         $title = $this->getTitle();
2378
2379                         if( empty( $wgAJAXCategoriesNamespaces ) || in_array( $title->getNamespace(), $wgAJAXCategoriesNamespaces ) ) {
2380                                 $this->addModules( 'mediawiki.page.ajaxCategories.init' );
2381                         }
2382                 }
2383         }
2384
2385         /**
2386          * Get a ResourceLoader object associated with this OutputPage
2387          *
2388          * @return ResourceLoader
2389          */
2390         public function getResourceLoader() {
2391                 if ( is_null( $this->mResourceLoader ) ) {
2392                         $this->mResourceLoader = new ResourceLoader();
2393                 }
2394                 return $this->mResourceLoader;
2395         }
2396
2397         /**
2398          * TODO: Document
2399          * @param $modules Array/string with the module name
2400          * @param $only String ResourceLoaderModule TYPE_ class constant
2401          * @param $useESI boolean
2402          * @return string html <script> and <style> tags
2403          */
2404         protected function makeResourceLoaderLink( $modules, $only, $useESI = false ) {
2405                 global $wgLoadScript, $wgResourceLoaderUseESI,
2406                         $wgResourceLoaderInlinePrivateModules;
2407                 // Lazy-load ResourceLoader
2408                 // TODO: Should this be a static function of ResourceLoader instead?
2409                 $baseQuery = array(
2410                         'lang' => $this->getContext()->getLang()->getCode(),
2411                         'debug' => ResourceLoader::inDebugMode() ? 'true' : 'false',
2412                         'skin' => $this->getSkin()->getSkinName(),
2413                         'only' => $only,
2414                 );
2415                 // Propagate printable and handheld parameters if present
2416                 if ( $this->isPrintable() ) {
2417                         $baseQuery['printable'] = 1;
2418                 }
2419                 if ( $this->getRequest()->getBool( 'handheld' ) ) {
2420                         $baseQuery['handheld'] = 1;
2421                 }
2422
2423                 if ( !count( $modules ) ) {
2424                         return '';
2425                 }
2426
2427                 if ( count( $modules ) > 1 ) {
2428                         // Remove duplicate module requests
2429                         $modules = array_unique( (array) $modules );
2430                         // Sort module names so requests are more uniform
2431                         sort( $modules );
2432
2433                         if ( ResourceLoader::inDebugMode() ) {
2434                                 // Recursively call us for every item
2435                                 $links = '';
2436                                 foreach ( $modules as $name ) {
2437                                         $links .= $this->makeResourceLoaderLink( $name, $only, $useESI );
2438                                 }
2439                                 return $links;
2440                         }
2441                 }
2442
2443                 // Create keyed-by-group list of module objects from modules list
2444                 $groups = array();
2445                 $resourceLoader = $this->getResourceLoader();
2446                 foreach ( (array) $modules as $name ) {
2447                         $module = $resourceLoader->getModule( $name );
2448                         # Check that we're allowed to include this module on this page
2449                         if ( ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_SCRIPTS )
2450                                         && $only == ResourceLoaderModule::TYPE_SCRIPTS )
2451                                 || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_STYLES )
2452                                         && $only == ResourceLoaderModule::TYPE_STYLES )
2453                                 )
2454                         {
2455                                 continue;
2456                         }
2457
2458                         $group = $module->getGroup();
2459                         if ( !isset( $groups[$group] ) ) {
2460                                 $groups[$group] = array();
2461                         }
2462                         $groups[$group][$name] = $module;
2463                 }
2464
2465                 $links = '';
2466                 foreach ( $groups as $group => $modules ) {
2467                         $query = $baseQuery;
2468                         // Special handling for user-specific groups
2469                         if ( ( $group === 'user' || $group === 'private' ) && $this->getUser()->isLoggedIn() ) {
2470                                 $query['user'] = $this->getUser()->getName();
2471                         }
2472
2473                         // Create a fake request based on the one we are about to make so modules return
2474                         // correct timestamp and emptiness data
2475                         $context = new ResourceLoaderContext( $resourceLoader, new FauxRequest( $query ) );
2476                         // Drop modules that know they're empty
2477                         foreach ( $modules as $key => $module ) {
2478                                 if ( $module->isKnownEmpty( $context ) ) {
2479                                         unset( $modules[$key] );
2480                                 }
2481                         }
2482                         // If there are no modules left, skip this group
2483                         if ( $modules === array() ) {
2484                                 continue;
2485                         }
2486
2487                         $query['modules'] = ResourceLoader::makePackedModulesString( array_keys( $modules ) );
2488
2489                         // Support inlining of private modules if configured as such
2490                         if ( $group === 'private' && $wgResourceLoaderInlinePrivateModules ) {
2491                                 if ( $only == ResourceLoaderModule::TYPE_STYLES ) {
2492                                         $links .= Html::inlineStyle(
2493                                                 $resourceLoader->makeModuleResponse( $context, $modules )
2494                                         );
2495                                 } else {
2496                                         $links .= Html::inlineScript(
2497                                                 ResourceLoader::makeLoaderConditionalScript(
2498                                                         $resourceLoader->makeModuleResponse( $context, $modules )
2499                                                 )
2500                                         );
2501                                 }
2502                                 $links .= "\n";
2503                                 continue;
2504                         }
2505                         // Special handling for the user group; because users might change their stuff
2506                         // on-wiki like user pages, or user preferences; we need to find the highest
2507                         // timestamp of these user-changable modules so we can ensure cache misses on change
2508                         // This should NOT be done for the site group (bug 27564) because anons get that too
2509                         // and we shouldn't be putting timestamps in Squid-cached HTML
2510                         if ( $group === 'user' ) {
2511                                 // Get the maximum timestamp
2512                                 $timestamp = 1;
2513                                 foreach ( $modules as $module ) {
2514                                         $timestamp = max( $timestamp, $module->getModifiedTime( $context ) );
2515                                 }
2516                                 // Add a version parameter so cache will break when things change
2517                                 $query['version'] = wfTimestamp( TS_ISO_8601_BASIC, $timestamp );
2518                         }
2519                         // Make queries uniform in order
2520                         ksort( $query );
2521
2522                         $url = wfAppendQuery( $wgLoadScript, $query );
2523                         // Prevent the IE6 extension check from being triggered (bug 28840)
2524                         // by appending a character that's invalid in Windows extensions ('*')
2525                         $url .= '&*';
2526                         if ( $useESI && $wgResourceLoaderUseESI ) {
2527                                 $esi = Xml::element( 'esi:include', array( 'src' => $url ) );
2528                                 if ( $only == ResourceLoaderModule::TYPE_STYLES ) {
2529                                         $link = Html::inlineStyle( $esi );
2530                                 } else {
2531                                         $link = Html::inlineScript( $esi );
2532                                 }
2533                         } else {
2534                                 // Automatically select style/script elements
2535                                 if ( $only === ResourceLoaderModule::TYPE_STYLES ) {
2536                                         $link = Html::linkedStyle( $url );
2537                                 } else {
2538                                         $link = Html::linkedScript( $url );
2539                                 }
2540                         }
2541
2542                         if( $group == 'noscript' ){
2543                                 $links .= Html::rawElement( 'noscript', array(), $link ) . "\n";
2544                         } else {
2545                                 $links .= $link . "\n";
2546                         }
2547                 }
2548                 return $links;
2549         }
2550
2551         /**
2552          * JS stuff to put in the <head>. This is the startup module, config
2553          * vars and modules marked with position 'top'
2554          *
2555          * @return String: HTML fragment
2556          */
2557         function getHeadScripts() {
2558                 // Startup - this will immediately load jquery and mediawiki modules
2559                 $scripts = $this->makeResourceLoaderLink( 'startup', ResourceLoaderModule::TYPE_SCRIPTS, true );
2560
2561                 // Load config before anything else
2562                 $scripts .= Html::inlineScript(
2563                         ResourceLoader::makeLoaderConditionalScript(
2564                                 ResourceLoader::makeConfigSetScript( $this->getJSVars() )
2565                         )
2566                 );
2567
2568                 // Script and Messages "only" requests marked for top inclusion
2569                 // Messages should go first
2570                 $scripts .= $this->makeResourceLoaderLink( $this->getModuleMessages( true, 'top' ), ResourceLoaderModule::TYPE_MESSAGES );
2571                 $scripts .= $this->makeResourceLoaderLink( $this->getModuleScripts( true, 'top' ), ResourceLoaderModule::TYPE_SCRIPTS );
2572
2573                 // Modules requests - let the client calculate dependencies and batch requests as it likes
2574                 // Only load modules that have marked themselves for loading at the top
2575                 $modules = $this->getModules( true, 'top' );
2576                 if ( $modules ) {
2577                         $scripts .= Html::inlineScript(
2578                                 ResourceLoader::makeLoaderConditionalScript(
2579                                         Xml::encodeJsCall( 'mw.loader.load', array( $modules ) )
2580                                 )
2581                         );
2582                 }
2583
2584                 return $scripts;
2585         }
2586
2587         /**
2588          * JS stuff to put at the bottom of the <body>: modules marked with position 'bottom',
2589          * legacy scripts ($this->mScripts), user preferences, site JS and user JS
2590          *
2591          * @return string
2592          */
2593         function getBottomScripts() {
2594                 global $wgUseSiteJs, $wgAllowUserJs;
2595
2596                 // Script and Messages "only" requests marked for bottom inclusion
2597                 // Messages should go first
2598                 $scripts = $this->makeResourceLoaderLink( $this->getModuleMessages( true, 'bottom' ), ResourceLoaderModule::TYPE_MESSAGES );
2599                 $scripts .= $this->makeResourceLoaderLink( $this->getModuleScripts( true, 'bottom' ), ResourceLoaderModule::TYPE_SCRIPTS );
2600
2601                 // Modules requests - let the client calculate dependencies and batch requests as it likes
2602                 // Only load modules that have marked themselves for loading at the bottom
2603                 $modules = $this->getModules( true, 'bottom' );
2604                 if ( $modules ) {
2605                         $scripts .= Html::inlineScript(
2606                                 ResourceLoader::makeLoaderConditionalScript(
2607                                         Xml::encodeJsCall( 'mw.loader.load', array( $modules ) )
2608                                 )
2609                         );
2610                 }
2611
2612                 // Legacy Scripts
2613                 $scripts .= "\n" . $this->mScripts;
2614
2615                 $userScripts = array( 'user.options', 'user.tokens' );
2616
2617                 // Add site JS if enabled
2618                 if ( $wgUseSiteJs ) {
2619                         $scripts .= $this->makeResourceLoaderLink( 'site', ResourceLoaderModule::TYPE_SCRIPTS );
2620                         if( $this->getUser()->isLoggedIn() ){
2621                                 $userScripts[] = 'user.groups';
2622                         }
2623                 }
2624
2625                 // Add user JS if enabled
2626                 if ( $wgAllowUserJs && $this->getUser()->isLoggedIn() ) {
2627                         if( $this->getTitle() && $this->getTitle()->isJsSubpage() && $this->userCanPreview() ) {
2628                                 # XXX: additional security check/prompt?
2629                                 $scripts .= Html::inlineScript( "\n" . $this->getRequest()->getText( 'wpTextbox1' ) . "\n" ) . "\n";
2630                         } else {
2631                                 # @todo FIXME: This means that User:Me/Common.js doesn't load when previewing
2632                                 # User:Me/Vector.js, and vice versa (bug26283)
2633                                 $userScripts[] = 'user';
2634                         }
2635                 }
2636                 $scripts .= $this->makeResourceLoaderLink( $userScripts, ResourceLoaderModule::TYPE_SCRIPTS );
2637
2638                 return $scripts;
2639         }
2640
2641         /**
2642          * Get an array containing global JS variables
2643          *
2644          * Do not add things here which can be evaluated in
2645          * ResourceLoaderStartupScript - in other words, without state.
2646          * You will only be adding bloat to the page and causing page caches to
2647          * have to be purged on configuration changes.
2648          */
2649         protected function getJSVars() {
2650                 global $wgUseAjax, $wgEnableMWSuggest, $wgContLang;
2651
2652                 $title = $this->getTitle();
2653                 $ns = $title->getNamespace();
2654                 $nsname = MWNamespace::exists( $ns ) ? MWNamespace::getCanonicalName( $ns ) : $title->getNsText();
2655                 if ( $ns == NS_SPECIAL ) {
2656                         list( $canonicalName, /*...*/ ) = SpecialPageFactory::resolveAlias( $title->getDBkey() );
2657                 } else {
2658                         $canonicalName = false; # bug 21115
2659                 }
2660
2661                 $vars = array(
2662                         'wgCanonicalNamespace' => $nsname,
2663                         'wgCanonicalSpecialPageName' => $canonicalName,
2664                         'wgNamespaceNumber' => $title->getNamespace(),
2665                         'wgPageName' => $title->getPrefixedDBKey(),
2666                         'wgTitle' => $title->getText(),
2667                         'wgCurRevisionId' => $title->getLatestRevID(),
2668                         'wgArticleId' => $title->getArticleId(),
2669                         'wgIsArticle' => $this->isArticle(),
2670                         'wgAction' => $this->getRequest()->getText( 'action', 'view' ),
2671                         'wgUserName' => $this->getUser()->isAnon() ? null : $this->getUser()->getName(),
2672                         'wgUserGroups' => $this->getUser()->getEffectiveGroups(),
2673                         'wgCategories' => $this->getCategories(),
2674                         'wgBreakFrames' => $this->getFrameOptions() == 'DENY',
2675                 );
2676                 if ( $wgContLang->hasVariants() ) {
2677                         $vars['wgUserVariant'] = $wgContLang->getPreferredVariant();
2678                 }
2679                 foreach ( $title->getRestrictionTypes() as $type ) {
2680                         $vars['wgRestriction' . ucfirst( $type )] = $title->getRestrictions( $type );
2681                 }
2682                 if ( $wgUseAjax && $wgEnableMWSuggest && !$this->getUser()->getOption( 'disablesuggest', false ) ) {
2683                         $vars['wgSearchNamespaces'] = SearchEngine::userNamespaces( $this->getUser() );
2684                 }
2685                 if ( $title->isMainPage() ) {
2686                         $vars['wgIsMainPage'] = true;
2687                 }
2688
2689                 // Allow extensions to add their custom variables to the global JS variables
2690                 wfRunHooks( 'MakeGlobalVariablesScript', array( &$vars ) );
2691
2692                 return $vars;
2693         }
2694
2695         /**
2696          * To make it harder for someone to slip a user a fake
2697          * user-JavaScript or user-CSS preview, a random token
2698          * is associated with the login session. If it's not
2699          * passed back with the preview request, we won't render
2700          * the code.
2701          *
2702          * @return bool
2703          */
2704         public function userCanPreview() {
2705                 if ( $this->getRequest()->getVal( 'action' ) != 'submit'
2706                         || !$this->getRequest()->wasPosted()
2707                         || !$this->getUser()->matchEditToken(
2708                                 $this->getRequest()->getVal( 'wpEditToken' ) )
2709                 ) {
2710                         return false;
2711                 }
2712                 if ( !$this->getTitle()->isJsSubpage() && !$this->getTitle()->isCssSubpage() ) {
2713                         return false;
2714                 }
2715
2716                 return !count( $this->getTitle()->getUserPermissionsErrors( 'edit', $this->getUser() ) );
2717         }
2718
2719         /**
2720          * @param $unused Unused
2721          * @param $addContentType bool
2722          *
2723          * @return string HTML tag links to be put in the header.
2724          */
2725         public function getHeadLinks( $unused = null, $addContentType = false ) {
2726                 global $wgUniversalEditButton, $wgFavicon, $wgAppleTouchIcon, $wgEnableAPI,
2727                         $wgSitename, $wgVersion, $wgHtml5, $wgMimeType,
2728                         $wgFeed, $wgOverrideSiteFeed, $wgAdvertisedFeedTypes,
2729                         $wgDisableLangConversion, $wgCanonicalLanguageLinks, $wgContLang,
2730                         $wgRightsPage, $wgRightsUrl;
2731
2732                 $tags = array();
2733
2734                 if ( $addContentType ) {
2735                         if ( $wgHtml5 ) {
2736                                 # More succinct than <meta http-equiv=Content-Type>, has the
2737                                 # same effect
2738                                 $tags[] = Html::element( 'meta', array( 'charset' => 'UTF-8' ) );
2739                         } else {
2740                                 $tags[] = Html::element( 'meta', array(
2741                                         'http-equiv' => 'Content-Type',
2742                                         'content' => "$wgMimeType; charset=UTF-8"
2743                                 ) );
2744                                 $tags[] = Html::element( 'meta', array(  // bug 15835
2745                                         'http-equiv' => 'Content-Style-Type',
2746                                         'content' => 'text/css'
2747                                 ) );
2748                         }
2749                 }
2750
2751                 $tags[] = Html::element( 'meta', array(
2752                         'name' => 'generator',
2753                         'content' => "MediaWiki $wgVersion",
2754                 ) );
2755
2756                 $p = "{$this->mIndexPolicy},{$this->mFollowPolicy}";
2757                 if( $p !== 'index,follow' ) {
2758                         // http://www.robotstxt.org/wc/meta-user.html
2759                         // Only show if it's different from the default robots policy
2760                         $tags[] = Html::element( 'meta', array(
2761                                 'name' => 'robots',
2762                                 'content' => $p,
2763                         ) );
2764                 }
2765
2766                 if ( count( $this->mKeywords ) > 0 ) {
2767                         $strip = array(
2768                                 "/<.*?" . ">/" => '',
2769                                 "/_/" => ' '
2770                         );
2771                         $tags[] = Html::element( 'meta', array(
2772                                 'name' => 'keywords',
2773                                 'content' =>  preg_replace(
2774                                         array_keys( $strip ),
2775                                         array_values( $strip ),
2776                                         implode( ',', $this->mKeywords )
2777                                 )
2778                         ) );
2779                 }
2780
2781                 foreach ( $this->mMetatags as $tag ) {
2782                         if ( 0 == strcasecmp( 'http:', substr( $tag[0], 0, 5 ) ) ) {
2783                                 $a = 'http-equiv';
2784                                 $tag[0] = substr( $tag[0], 5 );
2785                         } else {
2786                                 $a = 'name';
2787                         }
2788                         $tags[] = Html::element( 'meta',
2789                                 array(
2790                                         $a => $tag[0],
2791                                         'content' => $tag[1]
2792                                 )
2793                         );
2794                 }
2795
2796                 foreach ( $this->mLinktags as $tag ) {
2797                         $tags[] = Html::element( 'link', $tag );
2798                 }
2799
2800                 # Universal edit button
2801                 if ( $wgUniversalEditButton ) {
2802                         if ( $this->isArticleRelated() && $this->getTitle() && $this->getTitle()->quickUserCan( 'edit' )
2803                                 && ( $this->getTitle()->exists() || $this->getTitle()->quickUserCan( 'create' ) ) ) {
2804                                 // Original UniversalEditButton
2805                                 $msg = wfMsg( 'edit' );
2806                                 $tags[] = Html::element( 'link', array(
2807                                         'rel' => 'alternate',
2808                                         'type' => 'application/x-wiki',
2809                                         'title' => $msg,
2810                                         'href' => $this->getTitle()->getLocalURL( 'action=edit' )
2811                                 ) );
2812                                 // Alternate edit link
2813                                 $tags[] = Html::element( 'link', array(
2814                                         'rel' => 'edit',
2815                                         'title' => $msg,
2816                                         'href' => $this->getTitle()->getLocalURL( 'action=edit' )
2817                                 ) );
2818                         }
2819                 }
2820
2821                 # Generally the order of the favicon and apple-touch-icon links
2822                 # should not matter, but Konqueror (3.5.9 at least) incorrectly
2823                 # uses whichever one appears later in the HTML source. Make sure
2824                 # apple-touch-icon is specified first to avoid this.
2825                 if ( $wgAppleTouchIcon !== false ) {
2826                         $tags[] = Html::element( 'link', array( 'rel' => 'apple-touch-icon', 'href' => $wgAppleTouchIcon ) );
2827                 }
2828
2829                 if ( $wgFavicon !== false ) {
2830                         $tags[] = Html::element( 'link', array( 'rel' => 'shortcut icon', 'href' => $wgFavicon ) );
2831                 }
2832
2833                 # OpenSearch description link
2834                 $tags[] = Html::element( 'link', array(
2835                         'rel' => 'search',
2836                         'type' => 'application/opensearchdescription+xml',
2837                         'href' => wfScript( 'opensearch_desc' ),
2838                         'title' => wfMsgForContent( 'opensearch-desc' ),
2839                 ) );
2840
2841                 if ( $wgEnableAPI ) {
2842                         # Real Simple Discovery link, provides auto-discovery information
2843                         # for the MediaWiki API (and potentially additional custom API
2844                         # support such as WordPress or Twitter-compatible APIs for a
2845                         # blogging extension, etc)
2846                         $tags[] = Html::element( 'link', array(
2847                                 'rel' => 'EditURI',
2848                                 'type' => 'application/rsd+xml',
2849                                 'href' => wfExpandUrl( wfAppendQuery( wfScript( 'api' ), array( 'action' => 'rsd' ) ) ),
2850                         ) );
2851                 }
2852
2853                 # Language variants
2854                 if ( !$wgDisableLangConversion && $wgCanonicalLanguageLinks
2855                         && $wgContLang->hasVariants() ) {
2856
2857                         $urlvar = $wgContLang->getURLVariant();
2858
2859                         if ( !$urlvar ) {
2860                                 $variants = $wgContLang->getVariants();
2861                                 foreach ( $variants as $_v ) {
2862                                         $tags[] = Html::element( 'link', array(
2863                                                 'rel' => 'alternate',
2864                                                 'hreflang' => $_v,
2865                                                 'href' => $this->getTitle()->getLocalURL( '', $_v ) )
2866                                         );
2867                                 }
2868                         } else {
2869                                 $tags[] = Html::element( 'link', array(
2870                                         'rel' => 'canonical',
2871                                         'href' => $this->getTitle()->getFullURL() )
2872                                 );
2873                         }
2874                 }
2875
2876                 # Copyright
2877                 $copyright = '';
2878                 if ( $wgRightsPage ) {
2879                         $copy = Title::newFromText( $wgRightsPage );
2880
2881                         if ( $copy ) {
2882                                 $copyright = $copy->getLocalURL();
2883                         }
2884                 }
2885
2886                 if ( !$copyright && $wgRightsUrl ) {
2887                         $copyright = $wgRightsUrl;
2888                 }
2889
2890                 if ( $copyright ) {
2891                         $tags[] = Html::element( 'link', array(
2892                                 'rel' => 'copyright',
2893                                 'href' => $copyright )
2894                         );
2895                 }
2896
2897                 # Feeds
2898                 if ( $wgFeed ) {
2899                         foreach( $this->getSyndicationLinks() as $format => $link ) {
2900                                 # Use the page name for the title.  In principle, this could
2901                                 # lead to issues with having the same name for different feeds
2902                                 # corresponding to the same page, but we can't avoid that at
2903                                 # this low a level.
2904
2905                                 $tags[] = $this->feedLink(
2906                                         $format,
2907                                         $link,
2908                                         # Used messages: 'page-rss-feed' and 'page-atom-feed' (for an easier grep)
2909                                         wfMsg( "page-{$format}-feed", $this->getTitle()->getPrefixedText() )
2910                                 );
2911                         }
2912
2913                         # Recent changes feed should appear on every page (except recentchanges,
2914                         # that would be redundant). Put it after the per-page feed to avoid
2915                         # changing existing behavior. It's still available, probably via a
2916                         # menu in your browser. Some sites might have a different feed they'd
2917                         # like to promote instead of the RC feed (maybe like a "Recent New Articles"
2918                         # or "Breaking news" one). For this, we see if $wgOverrideSiteFeed is defined.
2919                         # If so, use it instead.
2920
2921                         $rctitle = SpecialPage::getTitleFor( 'Recentchanges' );
2922
2923                         if ( $wgOverrideSiteFeed ) {
2924                                 foreach ( $wgOverrideSiteFeed as $type => $feedUrl ) {
2925                                         $tags[] = $this->feedLink(
2926                                                 $type,
2927                                                 htmlspecialchars( $feedUrl ),
2928                                                 wfMsg( "site-{$type}-feed", $wgSitename )
2929                                         );
2930                                 }
2931                         } elseif ( $this->getTitle()->getPrefixedText() != $rctitle->getPrefixedText() ) {
2932                                 foreach ( $wgAdvertisedFeedTypes as $format ) {
2933                                         $tags[] = $this->feedLink(
2934                                                 $format,
2935                                                 $rctitle->getLocalURL( "feed={$format}" ),
2936                                                 wfMsg( "site-{$format}-feed", $wgSitename ) # For grep: 'site-rss-feed', 'site-atom-feed'.
2937                                         );
2938                                 }
2939                         }
2940                 }
2941                 return implode( "\n", $tags );
2942         }
2943
2944         /**
2945          * Generate a <link rel/> for a feed.
2946          *
2947          * @param $type String: feed type
2948          * @param $url String: URL to the feed
2949          * @param $text String: value of the "title" attribute
2950          * @return String: HTML fragment
2951          */
2952         private function feedLink( $type, $url, $text ) {
2953                 return Html::element( 'link', array(
2954                         'rel' => 'alternate',
2955                         'type' => "application/$type+xml",
2956                         'title' => $text,
2957                         'href' => $url )
2958                 );
2959         }
2960
2961         /**
2962          * Add a local or specified stylesheet, with the given media options.
2963          * Meant primarily for internal use...
2964          *
2965          * @param $style String: URL to the file
2966          * @param $media String: to specify a media type, 'screen', 'printable', 'handheld' or any.
2967          * @param $condition String: for IE conditional comments, specifying an IE version
2968          * @param $dir String: set to 'rtl' or 'ltr' for direction-specific sheets
2969          */
2970         public function addStyle( $style, $media = '', $condition = '', $dir = '' ) {
2971                 $options = array();
2972                 // Even though we expect the media type to be lowercase, but here we
2973                 // force it to lowercase to be safe.
2974                 if( $media ) {
2975                         $options['media'] = $media;
2976                 }
2977                 if( $condition ) {
2978                         $options['condition'] = $condition;
2979                 }
2980                 if( $dir ) {
2981                         $options['dir'] = $dir;
2982                 }
2983                 $this->styles[$style] = $options;
2984         }
2985
2986         /**
2987          * Adds inline CSS styles
2988          * @param $style_css Mixed: inline CSS
2989          */
2990         public function addInlineStyle( $style_css ){
2991                 $this->mInlineStyles .= Html::inlineStyle( $style_css );
2992         }
2993
2994         /**
2995          * Build a set of <link>s for the stylesheets specified in the $this->styles array.
2996          * These will be applied to various media & IE conditionals.
2997          *
2998          * @return string
2999          */
3000         public function buildCssLinks() {
3001                 global $wgUseSiteCss, $wgAllowUserCss, $wgAllowUserCssPrefs;
3002
3003                 $this->getSkin()->setupSkinUserCss( $this );
3004
3005                 // Add ResourceLoader styles
3006                 // Split the styles into four groups
3007                 $styles = array( 'other' => array(), 'user' => array(), 'site' => array(), 'private' => array(), 'noscript' => array() );
3008                 $resourceLoader = $this->getResourceLoader();
3009
3010                 $moduleStyles = $this->getModuleStyles();
3011
3012                 // Per-site custom styles
3013                 if ( $wgUseSiteCss ) {
3014                         $moduleStyles[] = 'site';
3015                         $moduleStyles[] = 'noscript';
3016                         if( $this->getUser()->isLoggedIn() ){
3017                                 $moduleStyles[] = 'user.groups';
3018                         }
3019                 }
3020
3021                 // Per-user custom styles
3022                 if ( $wgAllowUserCss ) {
3023                         if ( $this->getTitle()->isCssSubpage() && $this->userCanPreview() ) {
3024                                 // @todo FIXME: Properly escape the cdata!
3025                                 $out->addInlineStyle( $this->getRequest()->getText( 'wpTextbox1' ) );
3026                         } else {
3027                                 $moduleStyles[] = 'user';
3028                         }
3029                 }
3030
3031                 // Per-user preference styles
3032                 if ( $wgAllowUserCssPrefs ) {
3033                         $moduleStyles[] = 'user.options';
3034                 }
3035
3036                 foreach ( $moduleStyles as $name ) {
3037                         $group = $resourceLoader->getModule( $name )->getGroup();
3038                         // Modules in groups named "other" or anything different than "user", "site" or "private"
3039                         // will be placed in the "other" group
3040                         $styles[isset( $styles[$group] ) ? $group : 'other'][] = $name;
3041                 }
3042
3043                 // We want site, private and user styles to override dynamically added styles from modules, but we want
3044                 // dynamically added styles to override statically added styles from other modules. So the order
3045                 // has to be other, dynamic, site, private, user
3046                 // Add statically added styles for other modules
3047                 $ret = $this->makeResourceLoaderLink( $styles['other'], ResourceLoaderModule::TYPE_STYLES );
3048                 // Add normal styles added through addStyle()/addInlineStyle() here
3049                 $ret .= implode( "\n", $this->buildCssLinksArray() ) . $this->mInlineStyles;
3050                 // Add marker tag to mark the place where the client-side loader should inject dynamic styles
3051                 // We use a <meta> tag with a made-up name for this because that's valid HTML
3052                 $ret .= Html::element( 'meta', array( 'name' => 'ResourceLoaderDynamicStyles', 'content' => '' ) ) . "\n";
3053
3054                 // Add site, private and user styles
3055                 // 'private' at present only contains user.options, so put that before 'user'
3056                 // Any future private modules will likely have a similar user-specific character
3057                 foreach ( array( 'site', 'noscript', 'private', 'user' ) as $group ) {
3058                         $ret .= $this->makeResourceLoaderLink( $styles[$group],
3059                                         ResourceLoaderModule::TYPE_STYLES
3060                         );
3061                 }
3062                 return $ret;
3063         }
3064
3065         public function buildCssLinksArray() {
3066                 $links = array();
3067
3068                 // Add any extension CSS
3069                 foreach ( $this->mExtStyles as $url ) {
3070                         $this->addStyle( $url );
3071                 }
3072                 $this->mExtStyles = array();
3073
3074                 foreach( $this->styles as $file => $options ) {
3075                         $link = $this->styleLink( $file, $options );
3076                         if( $link ) {
3077                                 $links[$file] = $link;
3078                         }
3079                 }
3080                 return $links;
3081         }
3082
3083         /**
3084          * Generate \<link\> tags for stylesheets
3085          *
3086          * @param $style String: URL to the file
3087          * @param $options Array: option, can contain 'condition', 'dir', 'media'
3088          *                 keys
3089          * @return String: HTML fragment
3090          */
3091         protected function styleLink( $style, $options ) {
3092                 if( isset( $options['dir'] ) ) {
3093                         global $wgLang;
3094                         if( $wgLang->getDir() != $options['dir'] ) {
3095                                 return '';
3096                         }
3097                 }
3098
3099                 if( isset( $options['media'] ) ) {
3100                         $media = self::transformCssMedia( $options['media'] );
3101                         if( is_null( $media ) ) {
3102                                 return '';
3103                         }
3104                 } else {
3105                         $media = 'all';
3106                 }
3107
3108                 if( substr( $style, 0, 1 ) == '/' ||
3109                         substr( $style, 0, 5 ) == 'http:' ||
3110                         substr( $style, 0, 6 ) == 'https:' ) {
3111                         $url = $style;
3112                 } else {
3113                         global $wgStylePath, $wgStyleVersion;
3114                         $url = $wgStylePath . '/' . $style . '?' . $wgStyleVersion;
3115                 }
3116
3117                 $link = Html::linkedStyle( $url, $media );
3118
3119                 if( isset( $options['condition'] ) ) {
3120                         $condition = htmlspecialchars( $options['condition'] );
3121                         $link = "<!--[if $condition]>$link<![endif]-->";
3122                 }
3123                 return $link;
3124         }
3125
3126         /**
3127          * Transform "media" attribute based on request parameters
3128          *
3129          * @param $media String: current value of the "media" attribute
3130          * @return String: modified value of the "media" attribute
3131          */
3132         public static function transformCssMedia( $media ) {
3133                 global $wgRequest, $wgHandheldForIPhone;
3134
3135                 // Switch in on-screen display for media testing
3136                 $switches = array(
3137                         'printable' => 'print',
3138                         'handheld' => 'handheld',
3139                 );
3140                 foreach( $switches as $switch => $targetMedia ) {
3141                         if( $wgRequest->getBool( $switch ) ) {
3142                                 if( $media == $targetMedia ) {
3143                                         $media = '';
3144                                 } elseif( $media == 'screen' ) {
3145                                         return null;
3146                                 }
3147                         }
3148                 }
3149
3150                 // Expand longer media queries as iPhone doesn't grok 'handheld'
3151                 if( $wgHandheldForIPhone ) {
3152                         $mediaAliases = array(
3153                                 'screen' => 'screen and (min-device-width: 481px)',
3154                                 'handheld' => 'handheld, only screen and (max-device-width: 480px)',
3155                         );
3156
3157                         if( isset( $mediaAliases[$media] ) ) {
3158                                 $media = $mediaAliases[$media];
3159                         }
3160                 }
3161
3162                 return $media;
3163         }
3164
3165         /**
3166          * Add a wikitext-formatted message to the output.
3167          * This is equivalent to:
3168          *
3169          *    $wgOut->addWikiText( wfMsgNoTrans( ... ) )
3170          */
3171         public function addWikiMsg( /*...*/ ) {
3172                 $args = func_get_args();
3173                 $name = array_shift( $args );
3174                 $this->addWikiMsgArray( $name, $args );
3175         }
3176
3177         /**
3178          * Add a wikitext-formatted message to the output.
3179          * Like addWikiMsg() except the parameters are taken as an array
3180          * instead of a variable argument list.
3181          *
3182          * $options is passed through to wfMsgExt(), see that function for details.
3183          *
3184          * @param $name string
3185          * @param $args array
3186          * @param $options array
3187          */
3188         public function addWikiMsgArray( $name, $args, $options = array() ) {
3189                 $options[] = 'parse';
3190                 $text = wfMsgExt( $name, $options, $args );
3191                 $this->addHTML( $text );
3192         }
3193
3194         /**
3195          * This function takes a number of message/argument specifications, wraps them in
3196          * some overall structure, and then parses the result and adds it to the output.
3197          *
3198          * In the $wrap, $1 is replaced with the first message, $2 with the second, and so
3199          * on. The subsequent arguments may either be strings, in which case they are the
3200          * message names, or arrays, in which case the first element is the message name,
3201          * and subsequent elements are the parameters to that message.
3202          *
3203          * The special named parameter 'options' in a message specification array is passed
3204          * through to the $options parameter of wfMsgExt().
3205          *
3206          * Don't use this for messages that are not in users interface language.
3207          *
3208          * For example:
3209          *
3210          *    $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>", 'some-error' );
3211          *
3212          * Is equivalent to:
3213          *
3214          *    $wgOut->addWikiText( "<div class='error'>\n" . wfMsgNoTrans( 'some-error' ) . "\n</div>" );
3215          *
3216          * The newline after opening div is needed in some wikitext. See bug 19226.
3217          *
3218          * @param $wrap string
3219          */
3220         public function wrapWikiMsg( $wrap /*, ...*/ ) {
3221                 $msgSpecs = func_get_args();
3222                 array_shift( $msgSpecs );
3223                 $msgSpecs = array_values( $msgSpecs );
3224                 $s = $wrap;
3225                 foreach ( $msgSpecs as $n => $spec ) {
3226                         $options = array();
3227                         if ( is_array( $spec ) ) {
3228                                 $args = $spec;
3229                                 $name = array_shift( $args );
3230                                 if ( isset( $args['options'] ) ) {
3231                                         $options = $args['options'];
3232                                         unset( $args['options'] );
3233                                 }
3234                         }  else {
3235                                 $args = array();
3236                                 $name = $spec;
3237                         }
3238                         $s = str_replace( '$' . ( $n + 1 ), wfMsgExt( $name, $options, $args ), $s );
3239                 }
3240                 $this->addWikiText( $s );
3241         }
3242
3243         /**
3244          * Include jQuery core. Use this to avoid loading it multiple times
3245          * before we get a usable script loader.
3246          *
3247          * @param $modules Array: list of jQuery modules which should be loaded
3248          * @return Array: the list of modules which were not loaded.
3249          * @since 1.16
3250          * @deprecated since 1.17
3251          */
3252         public function includeJQuery( $modules = array() ) {
3253                 return array();
3254         }
3255
3256 }