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 extends ContextSource {
  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 = false;
  51
  52         /**
  53          * Should be private. Has get/set methods properly documented.
  54          * Stores "article flag" toggle.
  55          */
  56         var $mIsArticleRelated = true;
  57
  58         /**
  59          * Should be private. We have to set isPrintable(). Some pages should
  60          * never be printed (ex: redirections).
  61          */
  62         var $mPrintable = false;
  63
  64         /**
  65          * Should be private. We have set/get/append methods.
  66          *
  67          * Contains the page subtitle. Special pages usually have some links here.
  68          * Don't confuse with site subtitle added by skins.
  69          */
  70         var $mSubtitle = '';
  71
  72         var $mRedirect = '';
  73         var $mStatusCode;
  74
  75         /**
  76          * mLastModified and mEtag are used for sending cache control.
  77          * The whole caching system should probably be moved into its own class.
  78          */
  79         var $mLastModified = '';
  80
  81         /**
  82          * Should be private. No getter but used in sendCacheControl();
  83          * Contains an HTTP Entity Tags (see RFC 2616 section 3.13) which is used
  84          * as a unique identifier for the content. It is later used by the client
  85          * to compare its cached version with the server version. Client sends
  86          * headers If-Match and If-None-Match containing its locally cached ETAG value.
  87          *
  88          * To get more information, you will have to look at HTTP/1.1 protocol which
  89          * is properly described in RFC 2616 : http://tools.ietf.org/html/rfc2616
  90          */
  91         var $mETag = false;
  92
  93         var $mCategoryLinks = array();
  94         var $mCategories = array();
  95
  96         /// Should be private. Array of Interwiki Prefixed (non DB key) Titles (e.g. 'fr:Test page')
  97         var $mLanguageLinks = array();
  98
  99         /**
 100          * Should be private. Used for JavaScript (pre resource loader)
 101          * We should split js / css.
 102          * mScripts content is inserted as is in <head> by Skin. This might contains
 103          * either a link to a stylesheet or inline css.
 104          */
 105         var $mScripts = '';
 106
 107         /**
 108          * Inline CSS styles. Use addInlineStyle() sparsingly
 109          */
 110         var $mInlineStyles = '';
 111
 112         //
 113         var $mLinkColours;
 114
 115         /**
 116          * Used by skin template.
 117          * Example: $tpl->set( 'displaytitle', $out->mPageLinkTitle );
 118          */
 119         var $mPageLinkTitle = '';
 120
 121         /// Array of elements in <head>. Parser might add its own headers!
 122         var $mHeadItems = array();
 123
 124         // @todo FIXME: Next variables probably comes from the resource loader
 125         var $mModules = array(), $mModuleScripts = array(), $mModuleStyles = array(), $mModuleMessages = array();
 126         var $mResourceLoader;
 127
 128         /** @todo FIXME: Is this still used ?*/
 129         var $mInlineMsg = array();
 130
 131         var $mTemplateIds = array();
 132         var $mImageTimeKeys = array();
 133
 134         var $mRedirectCode = '';
 135
 136         var $mFeedLinksAppendQuery = null;
 137
 138         # What level of 'untrustworthiness' is allowed in CSS/JS modules loaded on this page?
 139         # @see ResourceLoaderModule::$origin
 140         # ResourceLoaderModule::ORIGIN_ALL is assumed unless overridden;
 141         protected $mAllowedModules = array(
 142                 ResourceLoaderModule::TYPE_COMBINED => ResourceLoaderModule::ORIGIN_ALL,
 143         );
 144
 145         /**
 146          * @EasterEgg I just love the name for this self documenting variable.
 147          * @todo document
 148          */
 149         var $mDoNothing = false;
 150
 151         // Parser related.
 152         var $mContainsOldMagic = 0, $mContainsNewMagic = 0;
 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         /**
 200          * An array of stylesheet filenames (relative from skins path), with options
 201          * for CSS media, IE conditions, and RTL/LTR direction.
 202          * For internal use; add settings in the skin via $this->addStyle()
 203          *
 204          * Style again! This seems like a code duplication since we already have
 205          * mStyles. This is what makes OpenSource amazing.
 206          */
 207         var $styles = array();
 208
 209         /**
 210          * Whether jQuery is already handled.
 211          */
 212         protected $mJQueryDone = false;
 213
 214         private $mIndexPolicy = 'index';
 215         private $mFollowPolicy = 'follow';
 216         private $mVaryHeader = array(
 217                 'Accept-Encoding' => array( 'list-contains=gzip' ),
 218                 'Cookie' => null
 219         );
 220
 221         /**
 222          * Constructor for OutputPage. This should not be called directly.
 223          * Instead a new RequestContext should be created and it will implicitly create
 224          * a OutputPage tied to that context.
 225          */
 226         function __construct( RequestContext $context = null ) {
 227                 if ( $context === null ) {
 228                         # Extensions should use `new RequestContext` instead of `new OutputPage` now.
 229                         wfDeprecated( __METHOD__ );
 230                 } else {
 231                         $this->setContext( $context );
 232                 }
 233         }
 234
 235         /**
 236          * Redirect to $url rather than displaying the normal page
 237          *
 238          * @param $url String: URL
 239          * @param $responsecode String: HTTP status code
 240          */
 241         public function redirect( $url, $responsecode = '302' ) {
 242                 # Strip newlines as a paranoia check for header injection in PHP<5.1.2
 243                 $this->mRedirect = str_replace( "\n", '', $url );
 244                 $this->mRedirectCode = $responsecode;
 245         }
 246
 247         /**
 248          * Get the URL to redirect to, or an empty string if not redirect URL set
 249          *
 250          * @return String
 251          */
 252         public function getRedirect() {
 253                 return $this->mRedirect;
 254         }
 255
 256         /**
 257          * Set the HTTP status code to send with the output.
 258          *
 259          * @param $statusCode Integer
 260          */
 261         public function setStatusCode( $statusCode ) {
 262                 $this->mStatusCode = $statusCode;
 263         }
 264
 265         /**
 266          * Add a new <meta> tag
 267          * To add an http-equiv meta tag, precede the name with "http:"
 268          *
 269          * @param $name String tag name
 270          * @param $val String tag value
 271          */
 272         function addMeta( $name, $val ) {
 273                 array_push( $this->mMetatags, array( $name, $val ) );
 274         }
 275
 276         /**
 277          * Add a keyword or a list of keywords in the page header
 278          *
 279          * @param $text String or array of strings
 280          */
 281         function addKeyword( $text ) {
 282                 if( is_array( $text ) ) {
 283                         $this->mKeywords = array_merge( $this->mKeywords, $text );
 284                 } else {
 285                         array_push( $this->mKeywords, $text );
 286                 }
 287         }
 288
 289         /**
 290          * Add a new \<link\> tag to the page header
 291          *
 292          * @param $linkarr Array: associative array of attributes.
 293          */
 294         function addLink( $linkarr ) {
 295                 array_push( $this->mLinktags, $linkarr );
 296         }
 297
 298         /**
 299          * Add a new \<link\> with "rel" attribute set to "meta"
 300          *
 301          * @param $linkarr Array: associative array mapping attribute names to their
 302          *                 values, both keys and values will be escaped, and the
 303          *                 "rel" attribute will be automatically added
 304          */
 305         function addMetadataLink( $linkarr ) {
 306                 $linkarr['rel'] = $this->getMetadataAttribute();
 307                 $this->addLink( $linkarr );
 308         }
 309
 310         /**
 311          * Get the value of the "rel" attribute for metadata links
 312          *
 313          * @return String
 314          */
 315         public function getMetadataAttribute() {
 316                 # note: buggy CC software only reads first "meta" link
 317                 static $haveMeta = false;
 318                 if ( $haveMeta ) {
 319                         return 'alternate meta';
 320                 } else {
 321                         $haveMeta = true;
 322                         return 'meta';
 323                 }
 324         }
 325
 326         /**
 327          * Add raw HTML to the list of scripts (including \<script\> tag, etc.)
 328          *
 329          * @param $script String: raw HTML
 330          */
 331         function addScript( $script ) {
 332                 $this->mScripts .= $script . "\n";
 333         }
 334
 335         /**
 336          * Register and add a stylesheet from an extension directory.
 337          *
 338          * @param $url String path to sheet.  Provide either a full url (beginning
 339          *             with 'http', etc) or a relative path from the document root
 340          *             (beginning with '/').  Otherwise it behaves identically to
 341          *             addStyle() and draws from the /skins folder.
 342          */
 343         public function addExtensionStyle( $url ) {
 344                 array_push( $this->mExtStyles, $url );
 345         }
 346
 347         /**
 348          * Get all styles added by extensions
 349          *
 350          * @return Array
 351          */
 352         function getExtStyle() {
 353                 return $this->mExtStyles;
 354         }
 355
 356         /**
 357          * Add a JavaScript file out of skins/common, or a given relative path.
 358          *
 359          * @param $file String: filename in skins/common or complete on-server path
 360          *              (/foo/bar.js)
 361          * @param $version String: style version of the file. Defaults to $wgStyleVersion
 362          */
 363         public function addScriptFile( $file, $version = null ) {
 364                 global $wgStylePath, $wgStyleVersion;
 365                 // See if $file parameter is an absolute URL or begins with a slash
 366                 if( substr( $file, 0, 1 ) == '/' || preg_match( '#^[a-z]*://#i', $file ) ) {
 367                         $path = $file;
 368                 } else {
 369                         $path = "{$wgStylePath}/common/{$file}";
 370                 }
 371                 if ( is_null( $version ) )
 372                         $version = $wgStyleVersion;
 373                 $this->addScript( Html::linkedScript( wfAppendQuery( $path, $version ) ) );
 374         }
 375
 376         /**
 377          * Add a self-contained script tag with the given contents
 378          *
 379          * @param $script String: JavaScript text, no <script> tags
 380          */
 381         public function addInlineScript( $script ) {
 382                 $this->mScripts .= Html::inlineScript( "\n$script\n" ) . "\n";
 383         }
 384
 385         /**
 386          * Get all registered JS and CSS tags for the header.
 387          *
 388          * @return String
 389          */
 390         function getScript() {
 391                 return $this->mScripts . $this->getHeadItems();
 392         }
 393
 394         /**
 395          * Filter an array of modules to remove insufficiently trustworthy members, and modules
 396          * which are no longer registered (eg a page is cached before an extension is disabled)
 397          * @param $modules Array
 398          * @param $position String if not null, only return modules with this position
 399          * @param $type string
 400          * @return Array
 401          */
 402         protected function filterModules( $modules, $position = null, $type = ResourceLoaderModule::TYPE_COMBINED ){
 403                 $resourceLoader = $this->getResourceLoader();
 404                 $filteredModules = array();
 405                 foreach( $modules as $val ){
 406                         $module = $resourceLoader->getModule( $val );
 407                         if( $module instanceof ResourceLoaderModule
 408                                 && $module->getOrigin() <= $this->getAllowedModules( $type )
 409                                 && ( is_null( $position ) || $module->getPosition() == $position ) )
 410                         {
 411                                 $filteredModules[] = $val;
 412                         }
 413                 }
 414                 return $filteredModules;
 415         }
 416
 417         /**
 418          * Get the list of modules to include on this page
 419          *
 420          * @param $filter Bool whether to filter out insufficiently trustworthy modules
 421          * @param $position String if not null, only return modules with this position
 422          * @param $param string
 423          * @return Array of module names
 424          */
 425         public function getModules( $filter = false, $position = null, $param = 'mModules' ) {
 426                 $modules = array_values( array_unique( $this->$param ) );
 427                 return $filter
 428                         ? $this->filterModules( $modules, $position )
 429                         : $modules;
 430         }
 431
 432         /**
 433          * Add one or more modules recognized by the resource loader. Modules added
 434          * through this function will be loaded by the resource loader when the
 435          * page loads.
 436          *
 437          * @param $modules Mixed: module name (string) or array of module names
 438          */
 439         public function addModules( $modules ) {
 440                 $this->mModules = array_merge( $this->mModules, (array)$modules );
 441         }
 442
 443         /**
 444          * Get the list of module JS to include on this page
 445          *
 446          * @param $filter
 447          * @param $position
 448          *
 449          * @return array of module names
 450          */
 451         public function getModuleScripts( $filter = false, $position = null ) {
 452                 return $this->getModules( $filter, $position, 'mModuleScripts' );
 453         }
 454
 455         /**
 456          * Add only JS of one or more modules recognized by the resource loader. Module
 457          * scripts added through this function will be loaded by the resource loader when
 458          * the page loads.
 459          *
 460          * @param $modules Mixed: module name (string) or array of module names
 461          */
 462         public function addModuleScripts( $modules ) {
 463                 $this->mModuleScripts = array_merge( $this->mModuleScripts, (array)$modules );
 464         }
 465
 466         /**
 467          * Get the list of module CSS to include on this page
 468          *
 469          * @param $filter
 470          * @param $position
 471          *
 472          * @return Array of module names
 473          */
 474         public function getModuleStyles( $filter = false, $position = null ) {
 475                 return $this->getModules( $filter,  $position, 'mModuleStyles' );
 476         }
 477
 478         /**
 479          * Add only CSS of one or more modules recognized by the resource loader. Module
 480          * styles added through this function will be loaded by the resource loader when
 481          * the page loads.
 482          *
 483          * @param $modules Mixed: module name (string) or array of module names
 484          */
 485         public function addModuleStyles( $modules ) {
 486                 $this->mModuleStyles = array_merge( $this->mModuleStyles, (array)$modules );
 487         }
 488
 489         /**
 490          * Get the list of module messages to include on this page
 491          *
 492          * @param $filter
 493          * @param $position
 494          *
 495          * @return Array of module names
 496          */
 497         public function getModuleMessages( $filter = false, $position = null ) {
 498                 return $this->getModules( $filter, $position, 'mModuleMessages' );
 499         }
 500
 501         /**
 502          * Add only messages of one or more modules recognized by the resource loader.
 503          * Module messages added through this function will be loaded by the resource
 504          * loader when the page loads.
 505          *
 506          * @param $modules Mixed: module name (string) or array of module names
 507          */
 508         public function addModuleMessages( $modules ) {
 509                 $this->mModuleMessages = array_merge( $this->mModuleMessages, (array)$modules );
 510         }
 511
 512         /**
 513          * Get all header items in a string
 514          *
 515          * @return String
 516          */
 517         function getHeadItems() {
 518                 $s = '';
 519                 foreach ( $this->mHeadItems as $item ) {
 520                         $s .= $item;
 521                 }
 522                 return $s;
 523         }
 524
 525         /**
 526          * Add or replace an header item to the output
 527          *
 528          * @param $name String: item name
 529          * @param $value String: raw HTML
 530          */
 531         public function addHeadItem( $name, $value ) {
 532                 $this->mHeadItems[$name] = $value;
 533         }
 534
 535         /**
 536          * Check if the header item $name is already set
 537          *
 538          * @param $name String: item name
 539          * @return Boolean
 540          */
 541         public function hasHeadItem( $name ) {
 542                 return isset( $this->mHeadItems[$name] );
 543         }
 544
 545         /**
 546          * Set the value of the ETag HTTP header, only used if $wgUseETag is true
 547          *
 548          * @param $tag String: value of "ETag" header
 549          */
 550         function setETag( $tag ) {
 551                 $this->mETag = $tag;
 552         }
 553
 554         /**
 555          * Set whether the output should only contain the body of the article,
 556          * without any skin, sidebar, etc.
 557          * Used e.g. when calling with "action=render".
 558          *
 559          * @param $only Boolean: whether to output only the body of the article
 560          */
 561         public function setArticleBodyOnly( $only ) {
 562                 $this->mArticleBodyOnly = $only;
 563         }
 564
 565         /**
 566          * Return whether the output will contain only the body of the article
 567          *
 568          * @return Boolean
 569          */
 570         public function getArticleBodyOnly() {
 571                 return $this->mArticleBodyOnly;
 572         }
 573
 574         /**
 575          * checkLastModified tells the client to use the client-cached page if
 576          * possible. If sucessful, the OutputPage is disabled so that
 577          * any future call to OutputPage->output() have no effect.
 578          *
 579          * Side effect: sets mLastModified for Last-Modified header
 580          *
 581          * @param $timestamp string
 582          *
 583          * @return Boolean: true iff cache-ok headers was sent.
 584          */
 585         public function checkLastModified( $timestamp ) {
 586                 global $wgCachePages, $wgCacheEpoch;
 587
 588                 if ( !$timestamp || $timestamp == '19700101000000' ) {
 589                         wfDebug( __METHOD__ . ": CACHE DISABLED, NO TIMESTAMP\n" );
 590                         return false;
 591                 }
 592                 if( !$wgCachePages ) {
 593                         wfDebug( __METHOD__ . ": CACHE DISABLED\n", false );
 594                         return false;
 595                 }
 596                 if( $this->getUser()->getOption( 'nocache' ) ) {
 597                         wfDebug( __METHOD__ . ": USER DISABLED CACHE\n", false );
 598                         return false;
 599                 }
 600
 601                 $timestamp = wfTimestamp( TS_MW, $timestamp );
 602                 $modifiedTimes = array(
 603                         'page' => $timestamp,
 604                         'user' => $this->getUser()->getTouched(),
 605                         'epoch' => $wgCacheEpoch
 606                 );
 607                 wfRunHooks( 'OutputPageCheckLastModified', array( &$modifiedTimes ) );
 608
 609                 $maxModified = max( $modifiedTimes );
 610                 $this->mLastModified = wfTimestamp( TS_RFC2822, $maxModified );
 611
 612                 if( empty( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) ) {
 613                         wfDebug( __METHOD__ . ": client did not send If-Modified-Since header\n", false );
 614                         return false;
 615                 }
 616
 617                 # Make debug info
 618                 $info = '';
 619                 foreach ( $modifiedTimes as $name => $value ) {
 620                         if ( $info !== '' ) {
 621                                 $info .= ', ';
 622                         }
 623                         $info .= "$name=" . wfTimestamp( TS_ISO_8601, $value );
 624                 }
 625
 626                 # IE sends sizes after the date like this:
 627                 # Wed, 20 Aug 2003 06:51:19 GMT; length=5202
 628                 # this breaks strtotime().
 629                 $clientHeader = preg_replace( '/;.*$/', '', $_SERVER["HTTP_IF_MODIFIED_SINCE"] );
 630
 631                 wfSuppressWarnings(); // E_STRICT system time bitching
 632                 $clientHeaderTime = strtotime( $clientHeader );
 633                 wfRestoreWarnings();
 634                 if ( !$clientHeaderTime ) {
 635                         wfDebug( __METHOD__ . ": unable to parse the client's If-Modified-Since header: $clientHeader\n" );
 636                         return false;
 637                 }
 638                 $clientHeaderTime = wfTimestamp( TS_MW, $clientHeaderTime );
 639
 640                 wfDebug( __METHOD__ . ": client sent If-Modified-Since: " .
 641                         wfTimestamp( TS_ISO_8601, $clientHeaderTime ) . "\n", false );
 642                 wfDebug( __METHOD__ . ": effective Last-Modified: " .
 643                         wfTimestamp( TS_ISO_8601, $maxModified ) . "\n", false );
 644                 if( $clientHeaderTime < $maxModified ) {
 645                         wfDebug( __METHOD__ . ": STALE, $info\n", false );
 646                         return false;
 647                 }
 648
 649                 # Not modified
 650                 # Give a 304 response code and disable body output
 651                 wfDebug( __METHOD__ . ": NOT MODIFIED, $info\n", false );
 652                 ini_set( 'zlib.output_compression', 0 );
 653                 $this->getRequest()->response()->header( "HTTP/1.1 304 Not Modified" );
 654                 $this->sendCacheControl();
 655                 $this->disable();
 656
 657                 // Don't output a compressed blob when using ob_gzhandler;
 658                 // it's technically against HTTP spec and seems to confuse
 659                 // Firefox when the response gets split over two packets.
 660                 wfClearOutputBuffers();
 661
 662                 return true;
 663         }
 664
 665         /**
 666          * Override the last modified timestamp
 667          *
 668          * @param $timestamp String: new timestamp, in a format readable by
 669          *        wfTimestamp()
 670          */
 671         public function setLastModified( $timestamp ) {
 672                 $this->mLastModified = wfTimestamp( TS_RFC2822, $timestamp );
 673         }
 674
 675         /**
 676          * Set the robot policy for the page: <http://www.robotstxt.org/meta.html>
 677          *
 678          * @param $policy String: the literal string to output as the contents of
 679          *   the meta tag.  Will be parsed according to the spec and output in
 680          *   standardized form.
 681          * @return null
 682          */
 683         public function setRobotPolicy( $policy ) {
 684                 $policy = Article::formatRobotPolicy( $policy );
 685
 686                 if( isset( $policy['index'] ) ) {
 687                         $this->setIndexPolicy( $policy['index'] );
 688                 }
 689                 if( isset( $policy['follow'] ) ) {
 690                         $this->setFollowPolicy( $policy['follow'] );
 691                 }
 692         }
 693
 694         /**
 695          * Set the index policy for the page, but leave the follow policy un-
 696          * touched.
 697          *
 698          * @param $policy string Either 'index' or 'noindex'.
 699          * @return null
 700          */
 701         public function setIndexPolicy( $policy ) {
 702                 $policy = trim( $policy );
 703                 if( in_array( $policy, array( 'index', 'noindex' ) ) ) {
 704                         $this->mIndexPolicy = $policy;
 705                 }
 706         }
 707
 708         /**
 709          * Set the follow policy for the page, but leave the index policy un-
 710          * touched.
 711          *
 712          * @param $policy String: either 'follow' or 'nofollow'.
 713          * @return null
 714          */
 715         public function setFollowPolicy( $policy ) {
 716                 $policy = trim( $policy );
 717                 if( in_array( $policy, array( 'follow', 'nofollow' ) ) ) {
 718                         $this->mFollowPolicy = $policy;
 719                 }
 720         }
 721
 722         /**
 723          * Set the new value of the "action text", this will be added to the
 724          * "HTML title", separated from it with " - ".
 725          *
 726          * @param $text String: new value of the "action text"
 727          */
 728         public function setPageTitleActionText( $text ) {
 729                 $this->mPageTitleActionText = $text;
 730         }
 731
 732         /**
 733          * Get the value of the "action text"
 734          *
 735          * @return String
 736          */
 737         public function getPageTitleActionText() {
 738                 if ( isset( $this->mPageTitleActionText ) ) {
 739                         return $this->mPageTitleActionText;
 740                 }
 741         }
 742
 743         /**
 744          * "HTML title" means the contents of <title>.
 745          * It is stored as plain, unescaped text and will be run through htmlspecialchars in the skin file.
 746          *
 747          * @param $name string
 748          */
 749         public function setHTMLTitle( $name ) {
 750                 $this->mHTMLtitle = $name;
 751         }
 752
 753         /**
 754          * Return the "HTML title", i.e. the content of the <title> tag.
 755          *
 756          * @return String
 757          */
 758         public function getHTMLTitle() {
 759                 return $this->mHTMLtitle;
 760         }
 761
 762         /**
 763          * "Page title" means the contents of \<h1\>. It is stored as a valid HTML fragment.
 764          * This function allows good tags like \<sup\> in the \<h1\> tag, but not bad tags like \<script\>.
 765          * This function automatically sets \<title\> to the same content as \<h1\> but with all tags removed.
 766          * Bad tags that were escaped in \<h1\> will still be escaped in \<title\>, and good tags like \<i\> will be dropped entirely.
 767          *
 768          * @param $name string
 769          */
 770         public function setPageTitle( $name ) {
 771                 # change "<script>foo&bar</script>" to "&lt;script&gt;foo&amp;bar&lt;/script&gt;"
 772                 # but leave "<i>foobar</i>" alone
 773                 $nameWithTags = Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags( $name ) );
 774                 $this->mPagetitle = $nameWithTags;
 775
 776                 # change "<i>foo&amp;bar</i>" to "foo&bar"
 777                 $this->setHTMLTitle( wfMsg( 'pagetitle', Sanitizer::stripAllTags( $nameWithTags ) ) );
 778         }
 779
 780         /**
 781          * Return the "page title", i.e. the content of the \<h1\> tag.
 782          *
 783          * @return String
 784          */
 785         public function getPageTitle() {
 786                 return $this->mPagetitle;
 787         }
 788
 789         /**
 790          * Set the Title object to use
 791          *
 792          * @param $t Title object
 793          */
 794         public function setTitle( Title $t ) {
 795                 $this->getContext()->setTitle( $t );
 796         }
 797
 798
 799         /**
 800          * Replace the subtile with $str
 801          *
 802          * @param $str String: new value of the subtitle
 803          */
 804         public function setSubtitle( $str ) {
 805                 $this->mSubtitle = /*$this->parse(*/ $str /*)*/; // @bug 2514
 806         }
 807
 808         /**
 809          * Add $str to the subtitle
 810          *
 811          * @param $str String to add to the subtitle
 812          */
 813         public function appendSubtitle( $str ) {
 814                 $this->mSubtitle .= /*$this->parse(*/ $str /*)*/; // @bug 2514
 815         }
 816
 817         /**
 818          * Get the subtitle
 819          *
 820          * @return String
 821          */
 822         public function getSubtitle() {
 823                 return $this->mSubtitle;
 824         }
 825
 826         /**
 827          * Set the page as printable, i.e. it'll be displayed with with all
 828          * print styles included
 829          */
 830         public function setPrintable() {
 831                 $this->mPrintable = true;
 832         }
 833
 834         /**
 835          * Return whether the page is "printable"
 836          *
 837          * @return Boolean
 838          */
 839         public function isPrintable() {
 840                 return $this->mPrintable;
 841         }
 842
 843         /**
 844          * Disable output completely, i.e. calling output() will have no effect
 845          */
 846         public function disable() {
 847                 $this->mDoNothing = true;
 848         }
 849
 850         /**
 851          * Return whether the output will be completely disabled
 852          *
 853          * @return Boolean
 854          */
 855         public function isDisabled() {
 856                 return $this->mDoNothing;
 857         }
 858
 859         /**
 860          * Show an "add new section" link?
 861          *
 862          * @return Boolean
 863          */
 864         public function showNewSectionLink() {
 865                 return $this->mNewSectionLink;
 866         }
 867
 868         /**
 869          * Forcibly hide the new section link?
 870          *
 871          * @return Boolean
 872          */
 873         public function forceHideNewSectionLink() {
 874                 return $this->mHideNewSectionLink;
 875         }
 876
 877         /**
 878          * Add or remove feed links in the page header
 879          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
 880          * for the new version
 881          * @see addFeedLink()
 882          *
 883          * @param $show Boolean: true: add default feeds, false: remove all feeds
 884          */
 885         public function setSyndicated( $show = true ) {
 886                 if ( $show ) {
 887                         $this->setFeedAppendQuery( false );
 888                 } else {
 889                         $this->mFeedLinks = array();
 890                 }
 891         }
 892
 893         /**
 894          * Add default feeds to the page header
 895          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
 896          * for the new version
 897          * @see addFeedLink()
 898          *
 899          * @param $val String: query to append to feed links or false to output
 900          *        default links
 901          */
 902         public function setFeedAppendQuery( $val ) {
 903                 global $wgAdvertisedFeedTypes;
 904
 905                 $this->mFeedLinks = array();
 906
 907                 foreach ( $wgAdvertisedFeedTypes as $type ) {
 908                         $query = "feed=$type";
 909                         if ( is_string( $val ) ) {
 910                                 $query .= '&' . $val;
 911                         }
 912                         $this->mFeedLinks[$type] = $this->getTitle()->getLocalURL( $query );
 913                 }
 914         }
 915
 916         /**
 917          * Add a feed link to the page header
 918          *
 919          * @param $format String: feed type, should be a key of $wgFeedClasses
 920          * @param $href String: URL
 921          */
 922         public function addFeedLink( $format, $href ) {
 923                 global $wgAdvertisedFeedTypes;
 924
 925                 if ( in_array( $format, $wgAdvertisedFeedTypes ) ) {
 926                         $this->mFeedLinks[$format] = $href;
 927                 }
 928         }
 929
 930         /**
 931          * Should we output feed links for this page?
 932          * @return Boolean
 933          */
 934         public function isSyndicated() {
 935                 return count( $this->mFeedLinks ) > 0;
 936         }
 937
 938         /**
 939          * Return URLs for each supported syndication format for this page.
 940          * @return array associating format keys with URLs
 941          */
 942         public function getSyndicationLinks() {
 943                 return $this->mFeedLinks;
 944         }
 945
 946         /**
 947          * Will currently always return null
 948          *
 949          * @return null
 950          */
 951         public function getFeedAppendQuery() {
 952                 return $this->mFeedLinksAppendQuery;
 953         }
 954
 955         /**
 956          * Set whether the displayed content is related to the source of the
 957          * corresponding article on the wiki
 958          * Setting true will cause the change "article related" toggle to true
 959          *
 960          * @param $v Boolean
 961          */
 962         public function setArticleFlag( $v ) {
 963                 $this->mIsarticle = $v;
 964                 if ( $v ) {
 965                         $this->mIsArticleRelated = $v;
 966                 }
 967         }
 968
 969         /**
 970          * Return whether the content displayed page is related to the source of
 971          * the corresponding article on the wiki
 972          *
 973          * @return Boolean
 974          */
 975         public function isArticle() {
 976                 return $this->mIsarticle;
 977         }
 978
 979         /**
 980          * Set whether this page is related an article on the wiki
 981          * Setting false will cause the change of "article flag" toggle to false
 982          *
 983          * @param $v Boolean
 984          */
 985         public function setArticleRelated( $v ) {
 986                 $this->mIsArticleRelated = $v;
 987                 if ( !$v ) {
 988                         $this->mIsarticle = false;
 989                 }
 990         }
 991
 992         /**
 993          * Return whether this page is related an article on the wiki
 994          *
 995          * @return Boolean
 996          */
 997         public function isArticleRelated() {
 998                 return $this->mIsArticleRelated;
 999         }
1000
1001         /**
1002          * Add new language links
1003          *
1004          * @param $newLinkArray Associative array mapping language code to the page
1005          *                      name
1006          */
1007         public function addLanguageLinks( $newLinkArray ) {
1008                 $this->mLanguageLinks += $newLinkArray;
1009         }
1010
1011         /**
1012          * Reset the language links and add new language links
1013          *
1014          * @param $newLinkArray Associative array mapping language code to the page
1015          *                      name
1016          */
1017         public function setLanguageLinks( $newLinkArray ) {
1018                 $this->mLanguageLinks = $newLinkArray;
1019         }
1020
1021         /**
1022          * Get the list of language links
1023          *
1024          * @return Array of Interwiki Prefixed (non DB key) Titles (e.g. 'fr:Test page')
1025          */
1026         public function getLanguageLinks() {
1027                 return $this->mLanguageLinks;
1028         }
1029
1030         /**
1031          * Add an array of categories, with names in the keys
1032          *
1033          * @param $categories Array mapping category name => sort key
1034          */
1035         public function addCategoryLinks( $categories ) {
1036                 global $wgContLang;
1037
1038                 if ( !is_array( $categories ) || count( $categories ) == 0 ) {
1039                         return;
1040                 }
1041
1042                 # Add the links to a LinkBatch
1043                 $arr = array( NS_CATEGORY => $categories );
1044                 $lb = new LinkBatch;
1045                 $lb->setArray( $arr );
1046
1047                 # Fetch existence plus the hiddencat property
1048                 $dbr = wfGetDB( DB_SLAVE );
1049                 $res = $dbr->select( array( 'page', 'page_props' ),
1050                         array( 'page_id', 'page_namespace', 'page_title', 'page_len', 'page_is_redirect', 'page_latest', 'pp_value' ),
1051                         $lb->constructSet( 'page', $dbr ),
1052                         __METHOD__,
1053                         array(),
1054                         array( 'page_props' => array( 'LEFT JOIN', array( 'pp_propname' => 'hiddencat', 'pp_page = page_id' ) ) )
1055                 );
1056
1057                 # Add the results to the link cache
1058                 $lb->addResultToCache( LinkCache::singleton(), $res );
1059
1060                 # Set all the values to 'normal'. This can be done with array_fill_keys in PHP 5.2.0+
1061                 $categories = array_combine(
1062                         array_keys( $categories ),
1063                         array_fill( 0, count( $categories ), 'normal' )
1064                 );
1065
1066                 # Mark hidden categories
1067                 foreach ( $res as $row ) {
1068                         if ( isset( $row->pp_value ) ) {
1069                                 $categories[$row->page_title] = 'hidden';
1070                         }
1071                 }
1072
1073                 # Add the remaining categories to the skin
1074                 if ( wfRunHooks( 'OutputPageMakeCategoryLinks', array( &$this, $categories, &$this->mCategoryLinks ) ) ) {
1075                         foreach ( $categories as $category => $type ) {
1076                                 $origcategory = $category;
1077                                 $title = Title::makeTitleSafe( NS_CATEGORY, $category );
1078                                 $wgContLang->findVariantLink( $category, $title, true );
1079                                 if ( $category != $origcategory ) {
1080                                         if ( array_key_exists( $category, $categories ) ) {
1081                                                 continue;
1082                                         }
1083                                 }
1084                                 $text = $wgContLang->convertHtml( $title->getText() );
1085                                 $this->mCategories[] = $title->getText();
1086                                 $this->mCategoryLinks[$type][] = Linker::link( $title, $text );
1087                         }
1088                 }
1089         }
1090
1091         /**
1092          * Reset the category links (but not the category list) and add $categories
1093          *
1094          * @param $categories Array mapping category name => sort key
1095          */
1096         public function setCategoryLinks( $categories ) {
1097                 $this->mCategoryLinks = array();
1098                 $this->addCategoryLinks( $categories );
1099         }
1100
1101         /**
1102          * Get the list of category links, in a 2-D array with the following format:
1103          * $arr[$type][] = $link, where $type is either "normal" or "hidden" (for
1104          * hidden categories) and $link a HTML fragment with a link to the category
1105          * page
1106          *
1107          * @return Array
1108          */
1109         public function getCategoryLinks() {
1110                 return $this->mCategoryLinks;
1111         }
1112
1113         /**
1114          * Get the list of category names this page belongs to
1115          *
1116          * @return Array of strings
1117          */
1118         public function getCategories() {
1119                 return $this->mCategories;
1120         }
1121
1122         /**
1123          * Do not allow scripts which can be modified by wiki users to load on this page;
1124          * only allow scripts bundled with, or generated by, the software.
1125          */
1126         public function disallowUserJs() {
1127                 $this->reduceAllowedModules(
1128                         ResourceLoaderModule::TYPE_SCRIPTS,
1129                         ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL
1130                 );
1131         }
1132
1133         /**
1134          * Return whether user JavaScript is allowed for this page
1135          * @deprecated since 1.18 Load modules with ResourceLoader, and origin and
1136          *     trustworthiness is identified and enforced automagically.
1137          * @return Boolean
1138          */
1139         public function isUserJsAllowed() {
1140                 return $this->getAllowedModules( ResourceLoaderModule::TYPE_SCRIPTS ) >= ResourceLoaderModule::ORIGIN_USER_INDIVIDUAL;
1141         }
1142
1143         /**
1144          * Show what level of JavaScript / CSS untrustworthiness is allowed on this page
1145          * @see ResourceLoaderModule::$origin
1146          * @param $type String ResourceLoaderModule TYPE_ constant
1147          * @return Int ResourceLoaderModule ORIGIN_ class constant
1148          */
1149         public function getAllowedModules( $type ){
1150                 if( $type == ResourceLoaderModule::TYPE_COMBINED ){
1151                         return min( array_values( $this->mAllowedModules ) );
1152                 } else {
1153                         return isset( $this->mAllowedModules[$type] )
1154                                 ? $this->mAllowedModules[$type]
1155                                 : ResourceLoaderModule::ORIGIN_ALL;
1156                 }
1157         }
1158
1159         /**
1160          * Set the highest level of CSS/JS untrustworthiness allowed
1161          * @param  $type String ResourceLoaderModule TYPE_ constant
1162          * @param  $level Int ResourceLoaderModule class constant
1163          */
1164         public function setAllowedModules( $type, $level ){
1165                 $this->mAllowedModules[$type] = $level;
1166         }
1167
1168         /**
1169          * As for setAllowedModules(), but don't inadvertantly make the page more accessible
1170          * @param  $type String
1171          * @param  $level Int ResourceLoaderModule class constant
1172          */
1173         public function reduceAllowedModules( $type, $level ){
1174                 $this->mAllowedModules[$type] = min( $this->getAllowedModules($type), $level );
1175         }
1176
1177         /**
1178          * Prepend $text to the body HTML
1179          *
1180          * @param $text String: HTML
1181          */
1182         public function prependHTML( $text ) {
1183                 $this->mBodytext = $text . $this->mBodytext;
1184         }
1185
1186         /**
1187          * Append $text to the body HTML
1188          *
1189          * @param $text String: HTML
1190          */
1191         public function addHTML( $text ) {
1192                 $this->mBodytext .= $text;
1193         }
1194
1195         /**
1196          * Clear the body HTML
1197          */
1198         public function clearHTML() {
1199                 $this->mBodytext = '';
1200         }
1201
1202         /**
1203          * Get the body HTML
1204          *
1205          * @return String: HTML
1206          */
1207         public function getHTML() {
1208                 return $this->mBodytext;
1209         }
1210
1211         /**
1212          * Add $text to the debug output
1213          *
1214          * @param $text String: debug text
1215          */
1216         public function debug( $text ) {
1217                 $this->mDebugtext .= $text;
1218         }
1219
1220         /**
1221          * Get/set the ParserOptions object to use for wikitext parsing
1222          *
1223          * @param $options either the ParserOption to use or null to only get the
1224          *                 current ParserOption object
1225          * @return ParserOptions object
1226          */
1227         public function parserOptions( $options = null ) {
1228                 if ( !$this->mParserOptions ) {
1229                         $this->mParserOptions = new ParserOptions;
1230                         $this->mParserOptions->setEditSection( false );
1231                 }
1232                 return wfSetVar( $this->mParserOptions, $options );
1233         }
1234
1235         /**
1236          * Set the revision ID which will be seen by the wiki text parser
1237          * for things such as embedded {{REVISIONID}} variable use.
1238          *
1239          * @param $revid Mixed: an positive integer, or null
1240          * @return Mixed: previous value
1241          */
1242         public function setRevisionId( $revid ) {
1243                 $val = is_null( $revid ) ? null : intval( $revid );
1244                 return wfSetVar( $this->mRevisionId, $val );
1245         }
1246
1247         /**
1248          * Get the displayed revision ID
1249          *
1250          * @return Integer
1251          */
1252         public function getRevisionId() {
1253                 return $this->mRevisionId;
1254         }
1255
1256         /**
1257          * Set the displayed file version
1258          *
1259          * @param $file File|false
1260          * @return Mixed: previous value
1261          */
1262         public function setFileVersion( $file ) {
1263                 $val = null;
1264                 if ( $file instanceof File && $file->exists() ) {
1265                         $val = array( 'time' => $file->getTimestamp(), 'sha1' => $file->getSha1() );
1266                 }
1267                 return wfSetVar( $this->mFileVersion, $val, true );
1268         }
1269
1270         /**
1271          * Get the displayed file version
1272          *
1273          * @return Array|null ('time' => MW timestamp, 'sha1' => sha1)
1274          */
1275         public function getFileVersion() {
1276                 return $this->mFileVersion;
1277         }
1278
1279         /**
1280          * Get the templates used on this page
1281          *
1282          * @return Array (namespace => dbKey => revId)
1283          * @since 1.18
1284          */
1285         public function getTemplateIds() {
1286                 return $this->mTemplateIds;
1287         }
1288
1289         /**
1290          * Get the files used on this page
1291          *
1292          * @return Array (dbKey => array('time' => MW timestamp or null, 'sha1' => sha1 or ''))
1293          * @since 1.18
1294          */
1295         public function getImageTimeKeys() {
1296                 return $this->mImageTimeKeys;
1297         }
1298
1299         /**
1300          * Convert wikitext to HTML and add it to the buffer
1301          * Default assumes that the current page title will be used.
1302          *
1303          * @param $text String
1304          * @param $linestart Boolean: is this the start of a line?
1305          */
1306         public function addWikiText( $text, $linestart = true ) {
1307                 $title = $this->getTitle(); // Work arround E_STRICT
1308                 $this->addWikiTextTitle( $text, $title, $linestart );
1309         }
1310
1311         /**
1312          * Add wikitext with a custom Title object
1313          *
1314          * @param $text String: wikitext
1315          * @param $title Title object
1316          * @param $linestart Boolean: is this the start of a line?
1317          */
1318         public function addWikiTextWithTitle( $text, &$title, $linestart = true ) {
1319                 $this->addWikiTextTitle( $text, $title, $linestart );
1320         }
1321
1322         /**
1323          * Add wikitext with a custom Title object and
1324          *
1325          * @param $text String: wikitext
1326          * @param $title Title object
1327          * @param $linestart Boolean: is this the start of a line?
1328          */
1329         function addWikiTextTitleTidy( $text, &$title, $linestart = true ) {
1330                 $this->addWikiTextTitle( $text, $title, $linestart, true );
1331         }
1332
1333         /**
1334          * Add wikitext with tidy enabled
1335          *
1336          * @param $text String: wikitext
1337          * @param $linestart Boolean: is this the start of a line?
1338          */
1339         public function addWikiTextTidy( $text, $linestart = true ) {
1340                 $title = $this->getTitle();
1341                 $this->addWikiTextTitleTidy( $text, $title, $linestart );
1342         }
1343
1344         /**
1345          * Add wikitext with a custom Title object
1346          *
1347          * @param $text String: wikitext
1348          * @param $title Title object
1349          * @param $linestart Boolean: is this the start of a line?
1350          * @param $tidy Boolean: whether to use tidy
1351          */
1352         public function addWikiTextTitle( $text, &$title, $linestart, $tidy = false ) {
1353                 global $wgParser;
1354
1355                 wfProfileIn( __METHOD__ );
1356
1357                 wfIncrStats( 'pcache_not_possible' );
1358
1359                 $popts = $this->parserOptions();
1360                 $oldTidy = $popts->setTidy( $tidy );
1361
1362                 $parserOutput = $wgParser->parse(
1363                         $text, $title, $popts,
1364                         $linestart, true, $this->mRevisionId
1365                 );
1366
1367                 $popts->setTidy( $oldTidy );
1368
1369                 $this->addParserOutput( $parserOutput );
1370
1371                 wfProfileOut( __METHOD__ );
1372         }
1373
1374         /**
1375          * Add a ParserOutput object, but without Html
1376          *
1377          * @param $parserOutput ParserOutput object
1378          */
1379         public function addParserOutputNoText( &$parserOutput ) {
1380                 $this->mLanguageLinks += $parserOutput->getLanguageLinks();
1381                 $this->addCategoryLinks( $parserOutput->getCategories() );
1382                 $this->mNewSectionLink = $parserOutput->getNewSection();
1383                 $this->mHideNewSectionLink = $parserOutput->getHideNewSection();
1384
1385                 $this->mParseWarnings = $parserOutput->getWarnings();
1386                 if ( !$parserOutput->isCacheable() ) {
1387                         $this->enableClientCache( false );
1388                 }
1389                 $this->mNoGallery = $parserOutput->getNoGallery();
1390                 $this->mHeadItems = array_merge( $this->mHeadItems, $parserOutput->getHeadItems() );
1391                 $this->addModules( $parserOutput->getModules() );
1392
1393                 // Template versioning...
1394                 foreach ( (array)$parserOutput->getTemplateIds() as $ns => $dbks ) {
1395                         if ( isset( $this->mTemplateIds[$ns] ) ) {
1396                                 $this->mTemplateIds[$ns] = $dbks + $this->mTemplateIds[$ns];
1397                         } else {
1398                                 $this->mTemplateIds[$ns] = $dbks;
1399                         }
1400                 }
1401                 // File versioning...
1402                 foreach ( (array)$parserOutput->getImageTimeKeys() as $dbk => $data ) {
1403                         $this->mImageTimeKeys[$dbk] = $data;
1404                 }
1405
1406                 // Hooks registered in the object
1407                 global $wgParserOutputHooks;
1408                 foreach ( $parserOutput->getOutputHooks() as $hookInfo ) {
1409                         list( $hookName, $data ) = $hookInfo;
1410                         if ( isset( $wgParserOutputHooks[$hookName] ) ) {
1411                                 call_user_func( $wgParserOutputHooks[$hookName], $this, $parserOutput, $data );
1412                         }
1413                 }
1414
1415                 wfRunHooks( 'OutputPageParserOutput', array( &$this, $parserOutput ) );
1416         }
1417
1418         /**
1419          * Add a ParserOutput object
1420          *
1421          * @param $parserOutput ParserOutput
1422          */
1423         function addParserOutput( &$parserOutput ) {
1424                 $this->addParserOutputNoText( $parserOutput );
1425                 $text = $parserOutput->getText();
1426                 wfRunHooks( 'OutputPageBeforeHTML', array( &$this, &$text ) );
1427                 $this->addHTML( $text );
1428         }
1429
1430
1431         /**
1432          * Add the output of a QuickTemplate to the output buffer
1433          *
1434          * @param $template QuickTemplate
1435          */
1436         public function addTemplate( &$template ) {
1437                 ob_start();
1438                 $template->execute();
1439                 $this->addHTML( ob_get_contents() );
1440                 ob_end_clean();
1441         }
1442
1443         /**
1444          * Parse wikitext and return the HTML.
1445          *
1446          * @param $text String
1447          * @param $linestart Boolean: is this the start of a line?
1448          * @param $interface Boolean: use interface language ($wgLang instead of
1449          *                   $wgContLang) while parsing language sensitive magic
1450          *                   words like GRAMMAR and PLURAL
1451          * @param $language  Language object: target language object, will override
1452          *                   $interface
1453          * @return String: HTML
1454          */
1455         public function parse( $text, $linestart = true, $interface = false, $language = null ) {
1456                 // Check one for one common cause for parser state resetting
1457                 $callers = wfGetAllCallers( 10 );
1458                 if ( strpos( $callers, 'Parser::extensionSubstitution' ) !== false ) {
1459                         throw new MWException( "wfMsg* function with parsing cannot be used " .
1460                                 "inside a tag hook. Should use parser->recursiveTagParse() instead" );
1461                 }
1462
1463                 global $wgParser;
1464
1465                 if( is_null( $this->getTitle() ) ) {
1466                         throw new MWException( 'Empty $mTitle in ' . __METHOD__ );
1467                 }
1468
1469                 $popts = $this->parserOptions();
1470                 if ( $interface ) {
1471                         $popts->setInterfaceMessage( true );
1472                 }
1473                 if ( $language !== null ) {
1474                         $oldLang = $popts->setTargetLanguage( $language );
1475                 }
1476
1477                 $parserOutput = $wgParser->parse(
1478                         $text, $this->getTitle(), $popts,
1479                         $linestart, true, $this->mRevisionId
1480                 );
1481
1482                 if ( $interface ) {
1483                         $popts->setInterfaceMessage( false );
1484                 }
1485                 if ( $language !== null ) {
1486                         $popts->setTargetLanguage( $oldLang );
1487                 }
1488
1489                 return $parserOutput->getText();
1490         }
1491
1492         /**
1493          * Parse wikitext, strip paragraphs, and return the HTML.
1494          *
1495          * @param $text String
1496          * @param $linestart Boolean: is this the start of a line?
1497          * @param $interface Boolean: use interface language ($wgLang instead of
1498          *                   $wgContLang) while parsing language sensitive magic
1499          *                   words like GRAMMAR and PLURAL
1500          * @return String: HTML
1501          */
1502         public function parseInline( $text, $linestart = true, $interface = false ) {
1503                 $parsed = $this->parse( $text, $linestart, $interface );
1504
1505                 $m = array();
1506                 if ( preg_match( '/^<p>(.*)\n?<\/p>\n?/sU', $parsed, $m ) ) {
1507                         $parsed = $m[1];
1508                 }
1509
1510                 return $parsed;
1511         }
1512
1513         /**
1514          * Set the value of the "s-maxage" part of the "Cache-control" HTTP header
1515          *
1516          * @param $maxage Integer: maximum cache time on the Squid, in seconds.
1517          */
1518         public function setSquidMaxage( $maxage ) {
1519                 $this->mSquidMaxage = $maxage;
1520         }
1521
1522         /**
1523          * Use enableClientCache(false) to force it to send nocache headers
1524          *
1525          * @param $state bool
1526          *
1527          * @return bool
1528          */
1529         public function enableClientCache( $state ) {
1530                 return wfSetVar( $this->mEnableClientCache, $state );
1531         }
1532
1533         /**
1534          * Get the list of cookies that will influence on the cache
1535          *
1536          * @return Array
1537          */
1538         function getCacheVaryCookies() {
1539                 global $wgCookiePrefix, $wgCacheVaryCookies;
1540                 static $cookies;
1541                 if ( $cookies === null ) {
1542                         $cookies = array_merge(
1543                                 array(
1544                                         "{$wgCookiePrefix}Token",
1545                                         "{$wgCookiePrefix}LoggedOut",
1546                                         session_name()
1547                                 ),
1548                                 $wgCacheVaryCookies
1549                         );
1550                         wfRunHooks( 'GetCacheVaryCookies', array( $this, &$cookies ) );
1551                 }
1552                 return $cookies;
1553         }
1554
1555         /**
1556          * Return whether this page is not cacheable because "useskin" or "uselang"
1557          * URL parameters were passed.
1558          *
1559          * @return Boolean
1560          */
1561         function uncacheableBecauseRequestVars() {
1562                 $request = $this->getRequest();
1563                 return $request->getText( 'useskin', false ) === false
1564                         && $request->getText( 'uselang', false ) === false;
1565         }
1566
1567         /**
1568          * Check if the request has a cache-varying cookie header
1569          * If it does, it's very important that we don't allow public caching
1570          *
1571          * @return Boolean
1572          */
1573         function haveCacheVaryCookies() {
1574                 $cookieHeader = $this->getRequest()->getHeader( 'cookie' );
1575                 if ( $cookieHeader === false ) {
1576                         return false;
1577                 }
1578                 $cvCookies = $this->getCacheVaryCookies();
1579                 foreach ( $cvCookies as $cookieName ) {
1580                         # Check for a simple string match, like the way squid does it
1581                         if ( strpos( $cookieHeader, $cookieName ) !== false ) {
1582                                 wfDebug( __METHOD__ . ": found $cookieName\n" );
1583                                 return true;
1584                         }
1585                 }
1586                 wfDebug( __METHOD__ . ": no cache-varying cookies found\n" );
1587                 return false;
1588         }
1589
1590         /**
1591          * Add an HTTP header that will influence on the cache
1592          *
1593          * @param $header String: header name
1594          * @param $option Array|null
1595          * @todo FIXME: Document the $option parameter; it appears to be for
1596          *        X-Vary-Options but what format is acceptable?
1597          */
1598         public function addVaryHeader( $header, $option = null ) {
1599                 if ( !array_key_exists( $header, $this->mVaryHeader ) ) {
1600                         $this->mVaryHeader[$header] = (array)$option;
1601                 } elseif( is_array( $option ) ) {
1602                         if( is_array( $this->mVaryHeader[$header] ) ) {
1603                                 $this->mVaryHeader[$header] = array_merge( $this->mVaryHeader[$header], $option );
1604                         } else {
1605                                 $this->mVaryHeader[$header] = $option;
1606                         }
1607                 }
1608                 $this->mVaryHeader[$header] = array_unique( $this->mVaryHeader[$header] );
1609         }
1610
1611         /**
1612          * Get a complete X-Vary-Options header
1613          *
1614          * @return String
1615          */
1616         public function getXVO() {
1617                 $cvCookies = $this->getCacheVaryCookies();
1618
1619                 $cookiesOption = array();
1620                 foreach ( $cvCookies as $cookieName ) {
1621                         $cookiesOption[] = 'string-contains=' . $cookieName;
1622                 }
1623                 $this->addVaryHeader( 'Cookie', $cookiesOption );
1624
1625                 $headers = array();
1626                 foreach( $this->mVaryHeader as $header => $option ) {
1627                         $newheader = $header;
1628                         if( is_array( $option ) ) {
1629                                 $newheader .= ';' . implode( ';', $option );
1630                         }
1631                         $headers[] = $newheader;
1632                 }
1633                 $xvo = 'X-Vary-Options: ' . implode( ',', $headers );
1634
1635                 return $xvo;
1636         }
1637
1638         /**
1639          * bug 21672: Add Accept-Language to Vary and XVO headers
1640          * if there's no 'variant' parameter existed in GET.
1641          *
1642          * For example:
1643          *   /w/index.php?title=Main_page should always be served; but
1644          *   /w/index.php?title=Main_page&variant=zh-cn should never be served.
1645          */
1646         function addAcceptLanguage() {
1647                 global $wgContLang;
1648                 if( !$this->getRequest()->getCheck( 'variant' ) && $wgContLang->hasVariants() ) {
1649                         $variants = $wgContLang->getVariants();
1650                         $aloption = array();
1651                         foreach ( $variants as $variant ) {
1652                                 if( $variant === $wgContLang->getCode() ) {
1653                                         continue;
1654                                 } else {
1655                                         $aloption[] = 'string-contains=' . $variant;
1656
1657                                         // IE and some other browsers use another form of language code
1658                                         // in their Accept-Language header, like "zh-CN" or "zh-TW".
1659                                         // We should handle these too.
1660                                         $ievariant = explode( '-', $variant );
1661                                         if ( count( $ievariant ) == 2 ) {
1662                                                 $ievariant[1] = strtoupper( $ievariant[1] );
1663                                                 $ievariant = implode( '-', $ievariant );
1664                                                 $aloption[] = 'string-contains=' . $ievariant;
1665                                         }
1666                                 }
1667                         }
1668                         $this->addVaryHeader( 'Accept-Language', $aloption );
1669                 }
1670         }
1671
1672         /**
1673          * Set a flag which will cause an X-Frame-Options header appropriate for
1674          * edit pages to be sent. The header value is controlled by
1675          * $wgEditPageFrameOptions.
1676          *
1677          * This is the default for special pages. If you display a CSRF-protected
1678          * form on an ordinary view page, then you need to call this function.
1679          *
1680          * @param $enable bool
1681          */
1682         public function preventClickjacking( $enable = true ) {
1683                 $this->mPreventClickjacking = $enable;
1684         }
1685
1686         /**
1687          * Turn off frame-breaking. Alias for $this->preventClickjacking(false).
1688          * This can be called from pages which do not contain any CSRF-protected
1689          * HTML form.
1690          */
1691         public function allowClickjacking() {
1692                 $this->mPreventClickjacking = false;
1693         }
1694
1695         /**
1696          * Get the X-Frame-Options header value (without the name part), or false
1697          * if there isn't one. This is used by Skin to determine whether to enable
1698          * JavaScript frame-breaking, for clients that don't support X-Frame-Options.
1699          *
1700          * @return string
1701          */
1702         public function getFrameOptions() {
1703                 global $wgBreakFrames, $wgEditPageFrameOptions;
1704                 if ( $wgBreakFrames ) {
1705                         return 'DENY';
1706                 } elseif ( $this->mPreventClickjacking && $wgEditPageFrameOptions ) {
1707                         return $wgEditPageFrameOptions;
1708                 }
1709         }
1710
1711         /**
1712          * Send cache control HTTP headers
1713          */
1714         public function sendCacheControl() {
1715                 global $wgUseSquid, $wgUseESI, $wgUseETag, $wgSquidMaxage, $wgUseXVO;
1716
1717                 $response = $this->getRequest()->response();
1718                 if ( $wgUseETag && $this->mETag ) {
1719                         $response->header( "ETag: $this->mETag" );
1720                 }
1721
1722                 $this->addAcceptLanguage();
1723
1724                 # don't serve compressed data to clients who can't handle it
1725                 # maintain different caches for logged-in users and non-logged in ones
1726                 $response->header( 'Vary: ' . join( ', ', array_keys( $this->mVaryHeader ) ) );
1727
1728                 if ( $wgUseXVO ) {
1729                         # Add an X-Vary-Options header for Squid with Wikimedia patches
1730                         $response->header( $this->getXVO() );
1731                 }
1732
1733                 if( !$this->uncacheableBecauseRequestVars() && $this->mEnableClientCache ) {
1734                         if(
1735                                 $wgUseSquid && session_id() == '' && !$this->isPrintable() &&
1736                                 $this->mSquidMaxage != 0 && !$this->haveCacheVaryCookies()
1737                         )
1738                         {
1739                                 if ( $wgUseESI ) {
1740                                         # We'll purge the proxy cache explicitly, but require end user agents
1741                                         # to revalidate against the proxy on each visit.
1742                                         # Surrogate-Control controls our Squid, Cache-Control downstream caches
1743                                         wfDebug( __METHOD__ . ": proxy caching with ESI; {$this->mLastModified} **\n", false );
1744                                         # start with a shorter timeout for initial testing
1745                                         # header( 'Surrogate-Control: max-age=2678400+2678400, content="ESI/1.0"');
1746                                         $response->header( 'Surrogate-Control: max-age='.$wgSquidMaxage.'+'.$this->mSquidMaxage.', content="ESI/1.0"');
1747                                         $response->header( 'Cache-Control: s-maxage=0, must-revalidate, max-age=0' );
1748                                 } else {
1749                                         # We'll purge the proxy cache for anons explicitly, but require end user agents
1750                                         # to revalidate against the proxy on each visit.
1751                                         # IMPORTANT! The Squid needs to replace the Cache-Control header with
1752                                         # Cache-Control: s-maxage=0, must-revalidate, max-age=0
1753                                         wfDebug( __METHOD__ . ": local proxy caching; {$this->mLastModified} **\n", false );
1754                                         # start with a shorter timeout for initial testing
1755                                         # header( "Cache-Control: s-maxage=2678400, must-revalidate, max-age=0" );
1756                                         $response->header( 'Cache-Control: s-maxage='.$this->mSquidMaxage.', must-revalidate, max-age=0' );
1757                                 }
1758                         } else {
1759                                 # We do want clients to cache if they can, but they *must* check for updates
1760                                 # on revisiting the page.
1761                                 wfDebug( __METHOD__ . ": private caching; {$this->mLastModified} **\n", false );
1762                                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1763                                 $response->header( "Cache-Control: private, must-revalidate, max-age=0" );
1764                         }
1765                         if($this->mLastModified) {
1766                                 $response->header( "Last-Modified: {$this->mLastModified}" );
1767                         }
1768                 } else {
1769                         wfDebug( __METHOD__ . ": no caching **\n", false );
1770
1771                         # In general, the absence of a last modified header should be enough to prevent
1772                         # the client from using its cache. We send a few other things just to make sure.
1773                         $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1774                         $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
1775                         $response->header( 'Pragma: no-cache' );
1776                 }
1777         }
1778
1779         /**
1780          * Get the message associed with the HTTP response code $code
1781          *
1782          * @param $code Integer: status code
1783          * @return String or null: message or null if $code is not in the list of
1784          *         messages
1785          *
1786          * @deprecated since 1.18 Use HttpStatus::getMessage() instead.
1787          */
1788         public static function getStatusMessage( $code ) {
1789                 wfDeprecated( __METHOD__ );
1790                 return HttpStatus::getMessage( $code );
1791         }
1792
1793         /**
1794          * Finally, all the text has been munged and accumulated into
1795          * the object, let's actually output it:
1796          */
1797         public function output() {
1798                 global $wgLanguageCode, $wgDebugRedirects, $wgMimeType;
1799
1800                 if( $this->mDoNothing ) {
1801                         return;
1802                 }
1803
1804                 wfProfileIn( __METHOD__ );
1805
1806                 $response = $this->getRequest()->response();
1807
1808                 if ( $this->mRedirect != '' ) {
1809                         # Standards require redirect URLs to be absolute
1810                         $this->mRedirect = wfExpandUrl( $this->mRedirect );
1811                         if( $this->mRedirectCode == '301' || $this->mRedirectCode == '303' ) {
1812                                 if( !$wgDebugRedirects ) {
1813                                         $message = HttpStatus::getMessage( $this->mRedirectCode );
1814                                         $response->header( "HTTP/1.1 {$this->mRedirectCode} $message" );
1815                                 }
1816                                 $this->mLastModified = wfTimestamp( TS_RFC2822 );
1817                         }
1818                         $this->sendCacheControl();
1819
1820                         $response->header( "Content-Type: text/html; charset=utf-8" );
1821                         if( $wgDebugRedirects ) {
1822                                 $url = htmlspecialchars( $this->mRedirect );
1823                                 print "<html>\n<head>\n<title>Redirect</title>\n</head>\n<body>\n";
1824                                 print "<p>Location: <a href=\"$url\">$url</a></p>\n";
1825                                 print "</body>\n</html>\n";
1826                         } else {
1827                                 $response->header( 'Location: ' . $this->mRedirect );
1828                         }
1829                         wfProfileOut( __METHOD__ );
1830                         return;
1831                 } elseif ( $this->mStatusCode ) {
1832                         $message = HttpStatus::getMessage( $this->mStatusCode );
1833                         if ( $message ) {
1834                                 $response->header( 'HTTP/1.1 ' . $this->mStatusCode . ' ' . $message );
1835                         }
1836                 }
1837
1838                 # Buffer output; final headers may depend on later processing
1839                 ob_start();
1840
1841                 $response->header( "Content-type: $wgMimeType; charset=UTF-8" );
1842                 $response->header( 'Content-language: ' . $wgLanguageCode );
1843
1844                 // Prevent framing, if requested
1845                 $frameOptions = $this->getFrameOptions();
1846                 if ( $frameOptions ) {
1847                         $response->header( "X-Frame-Options: $frameOptions" );
1848                 }
1849
1850                 if ( $this->mArticleBodyOnly ) {
1851                         $this->out( $this->mBodytext );
1852                 } else {
1853                         $this->addDefaultModules();
1854
1855                         $sk = $this->getSkin();
1856
1857                         // Hook that allows last minute changes to the output page, e.g.
1858                         // adding of CSS or Javascript by extensions.
1859                         wfRunHooks( 'BeforePageDisplay', array( &$this, &$sk ) );
1860
1861                         wfProfileIn( 'Output-skin' );
1862                         $sk->outputPage( $this );
1863                         wfProfileOut( 'Output-skin' );
1864                 }
1865
1866                 $this->sendCacheControl();
1867                 ob_end_flush();
1868                 wfProfileOut( __METHOD__ );
1869         }
1870
1871         /**
1872          * Actually output something with print().
1873          *
1874          * @param $ins String: the string to output
1875          */
1876         public function out( $ins ) {
1877                 print $ins;
1878         }
1879
1880         /**
1881          * Produce a "user is blocked" page.
1882          * @deprecated since 1.18
1883          */
1884         function blockedPage() {
1885                 throw new UserBlockedError( $this->getUser()->mBlock );
1886         }
1887
1888         /**
1889          * Output a standard error page
1890          *
1891          * @param $title String: message key for page title
1892          * @param $msg String: message key for page text
1893          * @param $params Array: message parameters
1894          */
1895         public function showErrorPage( $title, $msg, $params = array() ) {
1896                 if ( $this->getTitle() ) {
1897                         $this->mDebugtext .= 'Original title: ' . $this->getTitle()->getPrefixedText() . "\n";
1898                 }
1899                 $this->setPageTitle( wfMsg( $title ) );
1900                 $this->setHTMLTitle( wfMsg( 'errorpagetitle' ) );
1901                 $this->setRobotPolicy( 'noindex,nofollow' );
1902                 $this->setArticleRelated( false );
1903                 $this->enableClientCache( false );
1904                 $this->mRedirect = '';
1905                 $this->mBodytext = '';
1906
1907                 $this->addWikiMsgArray( $msg, $params );
1908
1909                 $this->returnToMain();
1910         }
1911
1912         /**
1913          * Output a standard permission error page
1914          *
1915          * @param $errors Array: error message keys
1916          * @param $action String: action that was denied or null if unknown
1917          */
1918         public function showPermissionsErrorPage( $errors, $action = null ) {
1919                 $this->mDebugtext .= 'Original title: ' .
1920                 $this->getTitle()->getPrefixedText() . "\n";
1921                 $this->setPageTitle( wfMsg( 'permissionserrors' ) );
1922                 $this->setHTMLTitle( wfMsg( 'permissionserrors' ) );
1923                 $this->setRobotPolicy( 'noindex,nofollow' );
1924                 $this->setArticleRelated( false );
1925                 $this->enableClientCache( false );
1926                 $this->mRedirect = '';
1927                 $this->mBodytext = '';
1928                 $this->addWikiText( $this->formatPermissionsErrorMessage( $errors, $action ) );
1929         }
1930
1931         /**
1932          * Display an error page indicating that a given version of MediaWiki is
1933          * required to use it
1934          *
1935          * @param $version Mixed: the version of MediaWiki needed to use the page
1936          */
1937         public function versionRequired( $version ) {
1938                 $this->setPageTitle( wfMsg( 'versionrequired', $version ) );
1939                 $this->setHTMLTitle( wfMsg( 'versionrequired', $version ) );
1940                 $this->setRobotPolicy( 'noindex,nofollow' );
1941                 $this->setArticleRelated( false );
1942                 $this->mBodytext = '';
1943
1944                 $this->addWikiMsg( 'versionrequiredtext', $version );
1945                 $this->returnToMain();
1946         }
1947
1948         /**
1949          * Display an error page noting that a given permission bit is required.
1950          * @deprecated since 1.18, just throw the exception directly
1951          * @param $permission String: key required
1952          */
1953         public function permissionRequired( $permission ) {
1954                 throw new PermissionsError( $permission );
1955         }
1956
1957         /**
1958          * Produce the stock "please login to use the wiki" page
1959          */
1960         public function loginToUse() {
1961                 if( $this->getUser()->isLoggedIn() ) {
1962                         throw new PermissionsError( 'read' );
1963                 }
1964
1965                 $this->setPageTitle( wfMsg( 'loginreqtitle' ) );
1966                 $this->setHtmlTitle( wfMsg( 'errorpagetitle' ) );
1967                 $this->setRobotPolicy( 'noindex,nofollow' );
1968                 $this->setArticleRelated( false );
1969
1970                 $loginTitle = SpecialPage::getTitleFor( 'Userlogin' );
1971                 $loginLink = Linker::linkKnown(
1972                         $loginTitle,
1973                         wfMsgHtml( 'loginreqlink' ),
1974                         array(),
1975                         array( 'returnto' => $this->getTitle()->getPrefixedText() )
1976                 );
1977                 $this->addHTML( wfMessage( 'loginreqpagetext' )->rawParams( $loginLink )->parse() .
1978                         "\n<!--" . $this->getTitle()->getPrefixedUrl() . '-->' );
1979
1980                 # Don't return to the main page if the user can't read it
1981                 # otherwise we'll end up in a pointless loop
1982                 $mainPage = Title::newMainPage();
1983                 if( $mainPage->userCanRead() ) {
1984                         $this->returnToMain( null, $mainPage );
1985                 }
1986         }
1987
1988         /**
1989          * Format a list of error messages
1990          *
1991          * @param $errors Array of arrays returned by Title::getUserPermissionsErrors
1992          * @param $action String: action that was denied or null if unknown
1993          * @return String: the wikitext error-messages, formatted into a list.
1994          */
1995         public function formatPermissionsErrorMessage( $errors, $action = null ) {
1996                 if ( $action == null ) {
1997                         $text = wfMsgNoTrans( 'permissionserrorstext', count( $errors ) ) . "\n\n";
1998                 } else {
1999                         $action_desc = wfMsgNoTrans( "action-$action" );
2000                         $text = wfMsgNoTrans(
2001                                 'permissionserrorstext-withaction',
2002                                 count( $errors ),
2003                                 $action_desc
2004                         ) . "\n\n";
2005                 }
2006
2007                 if ( count( $errors ) > 1 ) {
2008                         $text .= '<ul class="permissions-errors">' . "\n";
2009
2010                         foreach( $errors as $error ) {
2011                                 $text .= '<li>';
2012                                 $text .= call_user_func_array( 'wfMsgNoTrans', $error );
2013                                 $text .= "</li>\n";
2014                         }
2015                         $text .= '</ul>';
2016                 } else {
2017                         $text .= "<div class=\"permissions-errors\">\n" .
2018                                         call_user_func_array( 'wfMsgNoTrans', reset( $errors ) ) .
2019                                         "\n</div>";
2020                 }
2021
2022                 return $text;
2023         }
2024
2025         /**
2026          * Display a page stating that the Wiki is in read-only mode,
2027          * and optionally show the source of the page that the user
2028          * was trying to edit.  Should only be called (for this
2029          * purpose) after wfReadOnly() has returned true.
2030          *
2031          * For historical reasons, this function is _also_ used to
2032          * show the error message when a user tries to edit a page
2033          * they are not allowed to edit.  (Unless it's because they're
2034          * blocked, then we show blockedPage() instead.)  In this
2035          * case, the second parameter should be set to true and a list
2036          * of reasons supplied as the third parameter.
2037          *
2038          * @todo Needs to be split into multiple functions.
2039          *
2040          * @param $source    String: source code to show (or null).
2041          * @param $protected Boolean: is this a permissions error?
2042          * @param $reasons   Array: list of reasons for this error, as returned by Title::getUserPermissionsErrors().
2043          * @param $action    String: action that was denied or null if unknown
2044          */
2045         public function readOnlyPage( $source = null, $protected = false, $reasons = array(), $action = null ) {
2046                 $this->setRobotPolicy( 'noindex,nofollow' );
2047                 $this->setArticleRelated( false );
2048
2049                 // If no reason is given, just supply a default "I can't let you do
2050                 // that, Dave" message.  Should only occur if called by legacy code.
2051                 if ( $protected && empty( $reasons ) ) {
2052                         $reasons[] = array( 'badaccess-group0' );
2053                 }
2054
2055                 if ( !empty( $reasons ) ) {
2056                         // Permissions error
2057                         if( $source ) {
2058                                 $this->setPageTitle( wfMsg( 'viewsource' ) );
2059                                 $this->setSubtitle(
2060                                         wfMsg( 'viewsourcefor', Linker::linkKnown( $this->getTitle() ) )
2061                                 );
2062                         } else {
2063                                 $this->setPageTitle( wfMsg( 'badaccess' ) );
2064                         }
2065                         $this->addWikiText( $this->formatPermissionsErrorMessage( $reasons, $action ) );
2066                 } else {
2067                         // Wiki is read only
2068                         throw new ReadOnlyError;
2069                 }
2070
2071                 // Show source, if supplied
2072                 if( is_string( $source ) ) {
2073                         $this->addWikiMsg( 'viewsourcetext' );
2074
2075                         $params = array(
2076                                 'id'   => 'wpTextbox1',
2077                                 'name' => 'wpTextbox1',
2078                                 'cols' => $this->getUser()->getOption( 'cols' ),
2079                                 'rows' => $this->getUser()->getOption( 'rows' ),
2080                                 'readonly' => 'readonly'
2081                         );
2082                         $this->addHTML( Html::element( 'textarea', $params, $source ) );
2083
2084                         // Show templates used by this article
2085                         $article = new Article( $this->getTitle() );
2086                         $templates = Linker::formatTemplates( $article->getUsedTemplates() );
2087                         $this->addHTML( "<div class='templatesUsed'>
2088 $templates
2089 </div>
2090 " );
2091                 }
2092
2093                 # If the title doesn't exist, it's fairly pointless to print a return
2094                 # link to it.  After all, you just tried editing it and couldn't, so
2095                 # what's there to do there?
2096                 if( $this->getTitle()->exists() ) {
2097                         $this->returnToMain( null, $this->getTitle() );
2098                 }
2099         }
2100
2101         /**
2102          * Turn off regular page output and return an error reponse
2103          * for when rate limiting has triggered.
2104          */
2105         public function rateLimited() {
2106                 throw new ThrottledError;
2107         }
2108
2109         /**
2110          * Show a warning about slave lag
2111          *
2112          * If the lag is higher than $wgSlaveLagCritical seconds,
2113          * then the warning is a bit more obvious. If the lag is
2114          * lower than $wgSlaveLagWarning, then no warning is shown.
2115          *
2116          * @param $lag Integer: slave lag
2117          */
2118         public function showLagWarning( $lag ) {
2119                 global $wgSlaveLagWarning, $wgSlaveLagCritical;
2120                 if( $lag >= $wgSlaveLagWarning ) {
2121                         $message = $lag < $wgSlaveLagCritical
2122                                 ? 'lag-warn-normal'
2123                                 : 'lag-warn-high';
2124                         $wrap = Html::rawElement( 'div', array( 'class' => "mw-{$message}" ), "\n$1\n" );
2125                         $this->wrapWikiMsg( "$wrap\n", array( $message, $this->getContext()->getLang()->formatNum( $lag ) ) );
2126                 }
2127         }
2128
2129         public function showFatalError( $message ) {
2130                 $this->setPageTitle( wfMsg( 'internalerror' ) );
2131                 $this->setRobotPolicy( 'noindex,nofollow' );
2132                 $this->setArticleRelated( false );
2133                 $this->enableClientCache( false );
2134                 $this->mRedirect = '';
2135                 $this->mBodytext = $message;
2136         }
2137
2138         public function showUnexpectedValueError( $name, $val ) {
2139                 $this->showFatalError( wfMsg( 'unexpected', $name, $val ) );
2140         }
2141
2142         public function showFileCopyError( $old, $new ) {
2143                 $this->showFatalError( wfMsg( 'filecopyerror', $old, $new ) );
2144         }
2145
2146         public function showFileRenameError( $old, $new ) {
2147                 $this->showFatalError( wfMsg( 'filerenameerror', $old, $new ) );
2148         }
2149
2150         public function showFileDeleteError( $name ) {
2151                 $this->showFatalError( wfMsg( 'filedeleteerror', $name ) );
2152         }
2153
2154         public function showFileNotFoundError( $name ) {
2155                 $this->showFatalError( wfMsg( 'filenotfound', $name ) );
2156         }
2157
2158         /**
2159          * Add a "return to" link pointing to a specified title
2160          *
2161          * @param $title Title to link
2162          * @param $query String query string
2163          * @param $text String text of the link (input is not escaped)
2164          */
2165         public function addReturnTo( $title, $query = array(), $text = null ) {
2166                 $this->addLink( array( 'rel' => 'next', 'href' => $title->getFullURL() ) );
2167                 $link = wfMsgHtml(
2168                         'returnto',
2169                         Linker::link( $title, $text, array(), $query )
2170                 );
2171                 $this->addHTML( "<p id=\"mw-returnto\">{$link}</p>\n" );
2172         }
2173
2174         /**
2175          * Add a "return to" link pointing to a specified title,
2176          * or the title indicated in the request, or else the main page
2177          *
2178          * @param $unused No longer used
2179          * @param $returnto Title or String to return to
2180          * @param $returntoquery String: query string for the return to link
2181          */
2182         public function returnToMain( $unused = null, $returnto = null, $returntoquery = null ) {
2183                 if ( $returnto == null ) {
2184                         $returnto = $this->getRequest()->getText( 'returnto' );
2185                 }
2186
2187                 if ( $returntoquery == null ) {
2188                         $returntoquery = $this->getRequest()->getText( 'returntoquery' );
2189                 }
2190
2191                 if ( $returnto === '' ) {
2192                         $returnto = Title::newMainPage();
2193                 }
2194
2195                 if ( is_object( $returnto ) ) {
2196                         $titleObj = $returnto;
2197                 } else {
2198                         $titleObj = Title::newFromText( $returnto );
2199                 }
2200                 if ( !is_object( $titleObj ) ) {
2201                         $titleObj = Title::newMainPage();
2202                 }
2203
2204                 $this->addReturnTo( $titleObj, $returntoquery );
2205         }
2206
2207         /**
2208          * @param $sk Skin The given Skin
2209          * @param $includeStyle Boolean: unused
2210          * @return String: The doctype, opening <html>, and head element.
2211          */
2212         public function headElement( Skin $sk, $includeStyle = true ) {
2213                 global $wgContLang, $wgUseTrackbacks;
2214                 $userdir = $this->getLang()->getDir();
2215                 $sitedir = $wgContLang->getDir();
2216
2217                 if ( $sk->commonPrintStylesheet() ) {
2218                         $this->addModuleStyles( 'mediawiki.legacy.wikiprintable' );
2219                 }
2220
2221                 $ret = Html::htmlHeader( array( 'lang' => $this->getLang()->getCode(), 'dir' => $userdir ) );
2222
2223                 if ( $this->getHTMLTitle() == '' ) {
2224                         $this->setHTMLTitle( wfMsg( 'pagetitle', $this->getPageTitle() ) );
2225                 }
2226
2227                 $openHead = Html::openElement( 'head' );
2228                 if ( $openHead ) {
2229                         # Don't bother with the newline if $head == ''
2230                         $ret .= "$openHead\n";
2231                 }
2232
2233                 $ret .= Html::element( 'title', null, $this->getHTMLTitle() ) . "\n";
2234
2235                 $ret .= implode( "\n", array(
2236                         $this->getHeadLinks( null, true ),
2237                         $this->buildCssLinks(),
2238                         $this->getHeadScripts(),
2239                         $this->getHeadItems()
2240                 ) );
2241
2242                 if ( $wgUseTrackbacks && $this->isArticleRelated() ) {
2243                         $ret .= $this->getTitle()->trackbackRDF();
2244                 }
2245
2246                 $closeHead = Html::closeElement( 'head' );
2247                 if ( $closeHead ) {
2248                         $ret .= "$closeHead\n";
2249                 }
2250
2251                 $bodyAttrs = array();
2252
2253                 # Crazy edit-on-double-click stuff
2254                 if ( $this->isArticle() && $this->getUser()->getOption( 'editondblclick' ) ) {
2255                         $editUrl = $this->getTitle()->getLocalUrl( $sk->editUrlOptions() );
2256                         $bodyAttrs['ondblclick'] = "document.location = '" .
2257                                 Xml::escapeJsString( $editUrl ) . "'";
2258                 }
2259
2260                 # Classes for LTR/RTL directionality support
2261                 $bodyAttrs['class'] = "mediawiki $userdir sitedir-$sitedir";
2262
2263                 if ( $this->getContext()->getLang()->capitalizeAllNouns() ) {
2264                         # A <body> class is probably not the best way to do this . . .
2265                         $bodyAttrs['class'] .= ' capitalize-all-nouns';
2266                 }
2267                 $bodyAttrs['class'] .= ' ' . $sk->getPageClasses( $this->getTitle() );
2268                 $bodyAttrs['class'] .= ' skin-' . Sanitizer::escapeClass( $sk->getSkinName() );
2269
2270                 $sk->addToBodyAttributes( $this, $bodyAttrs ); // Allow skins to add body attributes they need
2271                 wfRunHooks( 'OutputPageBodyAttributes', array( $this, $sk, &$bodyAttrs ) );
2272
2273                 $ret .= Html::openElement( 'body', $bodyAttrs ) . "\n";
2274
2275                 return $ret;
2276         }
2277
2278         /**
2279          * Add the default ResourceLoader modules to this object
2280          */
2281         private function addDefaultModules() {
2282                 global $wgIncludeLegacyJavaScript, $wgUseAjax,
2283                         $wgAjaxWatch, $wgEnableMWSuggest, $wgUseAJAXCategories;
2284
2285                 // Add base resources
2286                 $this->addModules( array(
2287                         'mediawiki.user',
2288                         'mediawiki.util',
2289                         'mediawiki.page.startup',
2290                         'mediawiki.page.ready',
2291                 ) );
2292                 if ( $wgIncludeLegacyJavaScript ){
2293                         $this->addModules( 'mediawiki.legacy.wikibits' );
2294                 }
2295
2296                 // Add various resources if required
2297                 if ( $wgUseAjax ) {
2298                         $this->addModules( 'mediawiki.legacy.ajax' );
2299
2300                         wfRunHooks( 'AjaxAddScript', array( &$this ) );
2301
2302                         if( $wgAjaxWatch && $this->getUser()->isLoggedIn() ) {
2303                                 $this->addModules( 'mediawiki.action.watch.ajax' );
2304                         }
2305
2306                         if ( $wgEnableMWSuggest && !$this->getUser()->getOption( 'disablesuggest', false ) ) {
2307                                 $this->addModules( 'mediawiki.page.mwsuggest' );
2308                         }
2309                 }
2310
2311                 if ( $this->getUser()->getBoolOption( 'editsectiononrightclick' ) ) {
2312                         $this->addModules( 'mediawiki.action.view.rightClickEdit' );
2313                 }
2314
2315                 if ( $wgUseAJAXCategories ) {
2316                         global $wgAJAXCategoriesNamespaces;
2317
2318                         $title = $this->getTitle();
2319
2320                         if( empty( $wgAJAXCategoriesNamespaces ) || in_array( $title->getNamespace(), $wgAJAXCategoriesNamespaces ) ) {
2321                                 $this->addModules( 'mediawiki.page.ajaxCategories.init' );
2322                         }
2323                 }
2324         }
2325
2326         /**
2327          * Get a ResourceLoader object associated with this OutputPage
2328          *
2329          * @return ResourceLoader
2330          */
2331         public function getResourceLoader() {
2332                 if ( is_null( $this->mResourceLoader ) ) {
2333                         $this->mResourceLoader = new ResourceLoader();
2334                 }
2335                 return $this->mResourceLoader;
2336         }
2337
2338         /**
2339          * TODO: Document
2340          * @param $modules Array/string with the module name
2341          * @param $only String ResourceLoaderModule TYPE_ class constant
2342          * @param $useESI boolean
2343          * @return string html <script> and <style> tags
2344          */
2345         protected function makeResourceLoaderLink( $modules, $only, $useESI = false ) {
2346                 global $wgLoadScript, $wgResourceLoaderUseESI,
2347                         $wgResourceLoaderInlinePrivateModules;
2348                 // Lazy-load ResourceLoader
2349                 // TODO: Should this be a static function of ResourceLoader instead?
2350                 $baseQuery = array(
2351                         'lang' => $this->getContext()->getLang()->getCode(),
2352                         'debug' => ResourceLoader::inDebugMode() ? 'true' : 'false',
2353                         'skin' => $this->getSkin()->getSkinName(),
2354                 );
2355                 if ( $only !== ResourceLoaderModule::TYPE_COMBINED ) {
2356                         $baseQuery['only'] = $only;
2357                 }
2358                 // Propagate printable and handheld parameters if present
2359                 if ( $this->isPrintable() ) {
2360                         $baseQuery['printable'] = 1;
2361                 }
2362                 if ( $this->getRequest()->getBool( 'handheld' ) ) {
2363                         $baseQuery['handheld'] = 1;
2364                 }
2365
2366                 if ( !count( $modules ) ) {
2367                         return '';
2368                 }
2369
2370                 if ( count( $modules ) > 1 ) {
2371                         // Remove duplicate module requests
2372                         $modules = array_unique( (array) $modules );
2373                         // Sort module names so requests are more uniform
2374                         sort( $modules );
2375
2376                         if ( ResourceLoader::inDebugMode() ) {
2377                                 // Recursively call us for every item
2378                                 $links = '';
2379                                 foreach ( $modules as $name ) {
2380                                         $links .= $this->makeResourceLoaderLink( $name, $only, $useESI );
2381                                 }
2382                                 return $links;
2383                         }
2384                 }
2385
2386                 // Create keyed-by-group list of module objects from modules list
2387                 $groups = array();
2388                 $resourceLoader = $this->getResourceLoader();
2389                 foreach ( (array) $modules as $name ) {
2390                         $module = $resourceLoader->getModule( $name );
2391                         # Check that we're allowed to include this module on this page
2392                         if ( ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_SCRIPTS )
2393                                         && $only == ResourceLoaderModule::TYPE_SCRIPTS )
2394                                 || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_STYLES )
2395                                         && $only == ResourceLoaderModule::TYPE_STYLES )
2396                                 )
2397                         {
2398                                 continue;
2399                         }
2400
2401                         $group = $module->getGroup();
2402                         if ( !isset( $groups[$group] ) ) {
2403                                 $groups[$group] = array();
2404                         }
2405                         $groups[$group][$name] = $module;
2406                 }
2407
2408                 $links = '';
2409                 foreach ( $groups as $group => $modules ) {
2410                         $query = $baseQuery;
2411                         // Special handling for user-specific groups
2412                         if ( ( $group === 'user' || $group === 'private' ) && $this->getUser()->isLoggedIn() ) {
2413                                 $query['user'] = $this->getUser()->getName();
2414                         }
2415
2416                         // Create a fake request based on the one we are about to make so modules return
2417                         // correct timestamp and emptiness data
2418                         $context = new ResourceLoaderContext( $resourceLoader, new FauxRequest( $query ) );
2419                         // Drop modules that know they're empty
2420                         foreach ( $modules as $key => $module ) {
2421                                 if ( $module->isKnownEmpty( $context ) ) {
2422                                         unset( $modules[$key] );
2423                                 }
2424                         }
2425                         // If there are no modules left, skip this group
2426                         if ( $modules === array() ) {
2427                                 continue;
2428                         }
2429
2430                         $query['modules'] = ResourceLoader::makePackedModulesString( array_keys( $modules ) );
2431
2432                         // Support inlining of private modules if configured as such
2433                         if ( $group === 'private' && $wgResourceLoaderInlinePrivateModules ) {
2434                                 if ( $only == ResourceLoaderModule::TYPE_STYLES ) {
2435                                         $links .= Html::inlineStyle(
2436                                                 $resourceLoader->makeModuleResponse( $context, $modules )
2437                                         );
2438                                 } else {
2439                                         $links .= Html::inlineScript(
2440                                                 ResourceLoader::makeLoaderConditionalScript(
2441                                                         $resourceLoader->makeModuleResponse( $context, $modules )
2442                                                 )
2443                                         );
2444                                 }
2445                                 $links .= "\n";
2446                                 continue;
2447                         }
2448                         // Special handling for the user group; because users might change their stuff
2449                         // on-wiki like user pages, or user preferences; we need to find the highest
2450                         // timestamp of these user-changable modules so we can ensure cache misses on change
2451                         // This should NOT be done for the site group (bug 27564) because anons get that too
2452                         // and we shouldn't be putting timestamps in Squid-cached HTML
2453                         if ( $group === 'user' ) {
2454                                 // Get the maximum timestamp
2455                                 $timestamp = 1;
2456                                 foreach ( $modules as $module ) {
2457                                         $timestamp = max( $timestamp, $module->getModifiedTime( $context ) );
2458                                 }
2459                                 // Add a version parameter so cache will break when things change
2460                                 $query['version'] = wfTimestamp( TS_ISO_8601_BASIC, $timestamp );
2461                         }
2462                         // Make queries uniform in order
2463                         ksort( $query );
2464
2465                         $url = wfAppendQuery( $wgLoadScript, $query );
2466                         // Prevent the IE6 extension check from being triggered (bug 28840)
2467                         // by appending a character that's invalid in Windows extensions ('*')
2468                         $url .= '&*';
2469                         if ( $useESI && $wgResourceLoaderUseESI ) {
2470                                 $esi = Xml::element( 'esi:include', array( 'src' => $url ) );
2471                                 if ( $only == ResourceLoaderModule::TYPE_STYLES ) {
2472                                         $link = Html::inlineStyle( $esi );
2473                                 } else {
2474                                         $link = Html::inlineScript( $esi );
2475                                 }
2476                         } else {
2477                                 // Automatically select style/script elements
2478                                 if ( $only === ResourceLoaderModule::TYPE_STYLES ) {
2479                                         $link = Html::linkedStyle( $url );
2480                                 } else {
2481                                         $link = Html::linkedScript( $url );
2482                                 }
2483                         }
2484
2485                         if( $group == 'noscript' ){
2486                                 $links .= Html::rawElement( 'noscript', array(), $link ) . "\n";
2487                         } else {
2488                                 $links .= $link . "\n";
2489                         }
2490                 }
2491                 return $links;
2492         }
2493
2494         /**
2495          * JS stuff to put in the <head>. This is the startup module, config
2496          * vars and modules marked with position 'top'
2497          *
2498          * @return String: HTML fragment
2499          */
2500         function getHeadScripts() {
2501                 // Startup - this will immediately load jquery and mediawiki modules
2502                 $scripts = $this->makeResourceLoaderLink( 'startup', ResourceLoaderModule::TYPE_SCRIPTS, true );
2503
2504                 // Load config before anything else
2505                 $scripts .= Html::inlineScript(
2506                         ResourceLoader::makeLoaderConditionalScript(
2507                                 ResourceLoader::makeConfigSetScript( $this->getJSVars() )
2508                         )
2509                 );
2510
2511                 // Script and Messages "only" requests marked for top inclusion
2512                 // Messages should go first
2513                 $scripts .= $this->makeResourceLoaderLink( $this->getModuleMessages( true, 'top' ), ResourceLoaderModule::TYPE_MESSAGES );
2514                 $scripts .= $this->makeResourceLoaderLink( $this->getModuleScripts( true, 'top' ), ResourceLoaderModule::TYPE_SCRIPTS );
2515
2516                 // Modules requests - let the client calculate dependencies and batch requests as it likes
2517                 // Only load modules that have marked themselves for loading at the top
2518                 $modules = $this->getModules( true, 'top' );
2519                 if ( $modules ) {
2520                         $scripts .= Html::inlineScript(
2521                                 ResourceLoader::makeLoaderConditionalScript(
2522                                         Xml::encodeJsCall( 'mw.loader.load', array( $modules ) )
2523                                 )
2524                         );
2525                 }
2526
2527                 return $scripts;
2528         }
2529
2530         /**
2531          * JS stuff to put at the bottom of the <body>: modules marked with position 'bottom',
2532          * legacy scripts ($this->mScripts), user preferences, site JS and user JS
2533          *
2534          * @return string
2535          */
2536         function getBottomScripts() {
2537                 global $wgUseSiteJs, $wgAllowUserJs;
2538
2539                 // Script and Messages "only" requests marked for bottom inclusion
2540                 // Messages should go first
2541                 $scripts = $this->makeResourceLoaderLink( $this->getModuleMessages( true, 'bottom' ), ResourceLoaderModule::TYPE_MESSAGES );
2542                 $scripts .= $this->makeResourceLoaderLink( $this->getModuleScripts( true, 'bottom' ), ResourceLoaderModule::TYPE_SCRIPTS );
2543
2544                 // Modules requests - let the client calculate dependencies and batch requests as it likes
2545                 // Only load modules that have marked themselves for loading at the bottom
2546                 $modules = $this->getModules( true, 'bottom' );
2547                 if ( $modules ) {
2548                         $scripts .= Html::inlineScript(
2549                                 ResourceLoader::makeLoaderConditionalScript(
2550                                         Xml::encodeJsCall( 'mw.loader.load', array( $modules ) )
2551                                 )
2552                         );
2553                 }
2554
2555                 // Legacy Scripts
2556                 $scripts .= "\n" . $this->mScripts;
2557
2558                 $userScripts = array( 'user.options', 'user.tokens' );
2559
2560                 // Add site JS if enabled
2561                 if ( $wgUseSiteJs ) {
2562                         $scripts .= $this->makeResourceLoaderLink( 'site', ResourceLoaderModule::TYPE_SCRIPTS );
2563                         if( $this->getUser()->isLoggedIn() ){
2564                                 $userScripts[] = 'user.groups';
2565                         }
2566                 }
2567
2568                 // Add user JS if enabled
2569                 if ( $wgAllowUserJs && $this->getUser()->isLoggedIn() ) {
2570                         if( $this->getTitle() && $this->getTitle()->isJsSubpage() && $this->userCanPreview() ) {
2571                                 # XXX: additional security check/prompt?
2572                                 $scripts .= Html::inlineScript( "\n" . $this->getRequest()->getText( 'wpTextbox1' ) . "\n" ) . "\n";
2573                         } else {
2574                                 # @todo FIXME: This means that User:Me/Common.js doesn't load when previewing
2575                                 # User:Me/Vector.js, and vice versa (bug 26283)
2576
2577                                 // We can't do $userScripts[] = 'user'; because the user module would end up
2578                                 // being wrapped in a closure, so load it raw like 'site'
2579                                 $scripts .= $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_SCRIPTS );
2580                         }
2581                 }
2582                 $scripts .= $this->makeResourceLoaderLink( $userScripts, ResourceLoaderModule::TYPE_COMBINED );
2583
2584                 return $scripts;
2585         }
2586
2587         /**
2588          * Get an array containing global JS variables
2589          *
2590          * Do not add things here which can be evaluated in
2591          * ResourceLoaderStartupScript - in other words, without state.
2592          * You will only be adding bloat to the page and causing page caches to
2593          * have to be purged on configuration changes.
2594          */
2595         protected function getJSVars() {
2596                 global $wgUseAjax, $wgEnableMWSuggest, $wgContLang;
2597
2598                 $title = $this->getTitle();
2599                 $ns = $title->getNamespace();
2600                 $nsname = MWNamespace::exists( $ns ) ? MWNamespace::getCanonicalName( $ns ) : $title->getNsText();
2601                 if ( $ns == NS_SPECIAL ) {
2602                         list( $canonicalName, /*...*/ ) = SpecialPageFactory::resolveAlias( $title->getDBkey() );
2603                 } else {
2604                         $canonicalName = false; # bug 21115
2605                 }
2606
2607                 $vars = array(
2608                         'wgCanonicalNamespace' => $nsname,
2609                         'wgCanonicalSpecialPageName' => $canonicalName,
2610                         'wgNamespaceNumber' => $title->getNamespace(),
2611                         'wgPageName' => $title->getPrefixedDBKey(),
2612                         'wgTitle' => $title->getText(),
2613                         'wgCurRevisionId' => $title->getLatestRevID(),
2614                         'wgArticleId' => $title->getArticleId(),
2615                         'wgIsArticle' => $this->isArticle(),
2616                         'wgAction' => $this->getRequest()->getText( 'action', 'view' ),
2617                         'wgUserName' => $this->getUser()->isAnon() ? null : $this->getUser()->getName(),
2618                         'wgUserGroups' => $this->getUser()->getEffectiveGroups(),
2619                         'wgCategories' => $this->getCategories(),
2620                         'wgBreakFrames' => $this->getFrameOptions() == 'DENY',
2621                 );
2622                 if ( $wgContLang->hasVariants() ) {
2623                         $vars['wgUserVariant'] = $wgContLang->getPreferredVariant();
2624                 }
2625                 foreach ( $title->getRestrictionTypes() as $type ) {
2626                         $vars['wgRestriction' . ucfirst( $type )] = $title->getRestrictions( $type );
2627                 }
2628                 if ( $wgUseAjax && $wgEnableMWSuggest && !$this->getUser()->getOption( 'disablesuggest', false ) ) {
2629                         $vars['wgSearchNamespaces'] = SearchEngine::userNamespaces( $this->getUser() );
2630                 }
2631                 if ( $title->isMainPage() ) {
2632                         $vars['wgIsMainPage'] = true;
2633                 }
2634
2635                 // Allow extensions to add their custom variables to the global JS variables
2636                 wfRunHooks( 'MakeGlobalVariablesScript', array( &$vars ) );
2637
2638                 return $vars;
2639         }
2640
2641         /**
2642          * To make it harder for someone to slip a user a fake
2643          * user-JavaScript or user-CSS preview, a random token
2644          * is associated with the login session. If it's not
2645          * passed back with the preview request, we won't render
2646          * the code.
2647          *
2648          * @return bool
2649          */
2650         public function userCanPreview() {
2651                 if ( $this->getRequest()->getVal( 'action' ) != 'submit'
2652                         || !$this->getRequest()->wasPosted()
2653                         || !$this->getUser()->matchEditToken(
2654                                 $this->getRequest()->getVal( 'wpEditToken' ) )
2655                 ) {
2656                         return false;
2657                 }
2658                 if ( !$this->getTitle()->isJsSubpage() && !$this->getTitle()->isCssSubpage() ) {
2659                         return false;
2660                 }
2661
2662                 return !count( $this->getTitle()->getUserPermissionsErrors( 'edit', $this->getUser() ) );
2663         }
2664
2665         /**
2666          * @param $unused Unused
2667          * @param $addContentType bool
2668          *
2669          * @return string HTML tag links to be put in the header.
2670          */
2671         public function getHeadLinks( $unused = null, $addContentType = false ) {
2672                 global $wgUniversalEditButton, $wgFavicon, $wgAppleTouchIcon, $wgEnableAPI,
2673                         $wgSitename, $wgVersion, $wgHtml5, $wgMimeType,
2674                         $wgFeed, $wgOverrideSiteFeed, $wgAdvertisedFeedTypes,
2675                         $wgDisableLangConversion, $wgCanonicalLanguageLinks, $wgContLang,
2676                         $wgRightsPage, $wgRightsUrl;
2677
2678                 $tags = array();
2679
2680                 if ( $addContentType ) {
2681                         if ( $wgHtml5 ) {
2682                                 # More succinct than <meta http-equiv=Content-Type>, has the
2683                                 # same effect
2684                                 $tags[] = Html::element( 'meta', array( 'charset' => 'UTF-8' ) );
2685                         } else {
2686                                 $tags[] = Html::element( 'meta', array(
2687                                         'http-equiv' => 'Content-Type',
2688                                         'content' => "$wgMimeType; charset=UTF-8"
2689                                 ) );
2690                                 $tags[] = Html::element( 'meta', array(  // bug 15835
2691                                         'http-equiv' => 'Content-Style-Type',
2692                                         'content' => 'text/css'
2693                                 ) );
2694                         }
2695                 }
2696
2697                 $tags[] = Html::element( 'meta', array(
2698                         'name' => 'generator',
2699                         'content' => "MediaWiki $wgVersion",
2700                 ) );
2701
2702                 $p = "{$this->mIndexPolicy},{$this->mFollowPolicy}";
2703                 if( $p !== 'index,follow' ) {
2704                         // http://www.robotstxt.org/wc/meta-user.html
2705                         // Only show if it's different from the default robots policy
2706                         $tags[] = Html::element( 'meta', array(
2707                                 'name' => 'robots',
2708                                 'content' => $p,
2709                         ) );
2710                 }
2711
2712                 if ( count( $this->mKeywords ) > 0 ) {
2713                         $strip = array(
2714                                 "/<.*?" . ">/" => '',
2715                                 "/_/" => ' '
2716                         );
2717                         $tags[] = Html::element( 'meta', array(
2718                                 'name' => 'keywords',
2719                                 'content' =>  preg_replace(
2720                                         array_keys( $strip ),
2721                                         array_values( $strip ),
2722                                         implode( ',', $this->mKeywords )
2723                                 )
2724                         ) );
2725                 }
2726
2727                 foreach ( $this->mMetatags as $tag ) {
2728                         if ( 0 == strcasecmp( 'http:', substr( $tag[0], 0, 5 ) ) ) {
2729                                 $a = 'http-equiv';
2730                                 $tag[0] = substr( $tag[0], 5 );
2731                         } else {
2732                                 $a = 'name';
2733                         }
2734                         $tags[] = Html::element( 'meta',
2735                                 array(
2736                                         $a => $tag[0],
2737                                         'content' => $tag[1]
2738                                 )
2739                         );
2740                 }
2741
2742                 foreach ( $this->mLinktags as $tag ) {
2743                         $tags[] = Html::element( 'link', $tag );
2744                 }
2745
2746                 # Universal edit button
2747                 if ( $wgUniversalEditButton ) {
2748                         if ( $this->isArticleRelated() && $this->getTitle() && $this->getTitle()->quickUserCan( 'edit' )
2749                                 && ( $this->getTitle()->exists() || $this->getTitle()->quickUserCan( 'create' ) ) ) {
2750                                 // Original UniversalEditButton
2751                                 $msg = wfMsg( 'edit' );
2752                                 $tags[] = Html::element( 'link', array(
2753                                         'rel' => 'alternate',
2754                                         'type' => 'application/x-wiki',
2755                                         'title' => $msg,
2756                                         'href' => $this->getTitle()->getLocalURL( 'action=edit' )
2757                                 ) );
2758                                 // Alternate edit link
2759                                 $tags[] = Html::element( 'link', array(
2760                                         'rel' => 'edit',
2761                                         'title' => $msg,
2762                                         'href' => $this->getTitle()->getLocalURL( 'action=edit' )
2763                                 ) );
2764                         }
2765                 }
2766
2767                 # Generally the order of the favicon and apple-touch-icon links
2768                 # should not matter, but Konqueror (3.5.9 at least) incorrectly
2769                 # uses whichever one appears later in the HTML source. Make sure
2770                 # apple-touch-icon is specified first to avoid this.
2771                 if ( $wgAppleTouchIcon !== false ) {
2772                         $tags[] = Html::element( 'link', array( 'rel' => 'apple-touch-icon', 'href' => $wgAppleTouchIcon ) );
2773                 }
2774
2775                 if ( $wgFavicon !== false ) {
2776                         $tags[] = Html::element( 'link', array( 'rel' => 'shortcut icon', 'href' => $wgFavicon ) );
2777                 }
2778
2779                 # OpenSearch description link
2780                 $tags[] = Html::element( 'link', array(
2781                         'rel' => 'search',
2782                         'type' => 'application/opensearchdescription+xml',
2783                         'href' => wfScript( 'opensearch_desc' ),
2784                         'title' => wfMsgForContent( 'opensearch-desc' ),
2785                 ) );
2786
2787                 if ( $wgEnableAPI ) {
2788                         # Real Simple Discovery link, provides auto-discovery information
2789                         # for the MediaWiki API (and potentially additional custom API
2790                         # support such as WordPress or Twitter-compatible APIs for a
2791                         # blogging extension, etc)
2792                         $tags[] = Html::element( 'link', array(
2793                                 'rel' => 'EditURI',
2794                                 'type' => 'application/rsd+xml',
2795                                 'href' => wfExpandUrl( wfAppendQuery( wfScript( 'api' ), array( 'action' => 'rsd' ) ) ),
2796                         ) );
2797                 }
2798
2799                 # Language variants
2800                 if ( !$wgDisableLangConversion && $wgCanonicalLanguageLinks
2801                         && $wgContLang->hasVariants() ) {
2802
2803                         $urlvar = $wgContLang->getURLVariant();
2804
2805                         if ( !$urlvar ) {
2806                                 $variants = $wgContLang->getVariants();
2807                                 foreach ( $variants as $_v ) {
2808                                         $tags[] = Html::element( 'link', array(
2809                                                 'rel' => 'alternate',
2810                                                 'hreflang' => $_v,
2811                                                 'href' => $this->getTitle()->getLocalURL( '', $_v ) )
2812                                         );
2813                                 }
2814                         } else {
2815                                 $tags[] = Html::element( 'link', array(
2816                                         'rel' => 'canonical',
2817                                         'href' => $this->getTitle()->getFullURL() )
2818                                 );
2819                         }
2820                 }
2821
2822                 # Copyright
2823                 $copyright = '';
2824                 if ( $wgRightsPage ) {
2825                         $copy = Title::newFromText( $wgRightsPage );
2826
2827                         if ( $copy ) {
2828                                 $copyright = $copy->getLocalURL();
2829                         }
2830                 }
2831
2832                 if ( !$copyright && $wgRightsUrl ) {
2833                         $copyright = $wgRightsUrl;
2834                 }
2835
2836                 if ( $copyright ) {
2837                         $tags[] = Html::element( 'link', array(
2838                                 'rel' => 'copyright',
2839                                 'href' => $copyright )
2840                         );
2841                 }
2842
2843                 # Feeds
2844                 if ( $wgFeed ) {
2845                         foreach( $this->getSyndicationLinks() as $format => $link ) {
2846                                 # Use the page name for the title.  In principle, this could
2847                                 # lead to issues with having the same name for different feeds
2848                                 # corresponding to the same page, but we can't avoid that at
2849                                 # this low a level.
2850
2851                                 $tags[] = $this->feedLink(
2852                                         $format,
2853                                         $link,
2854                                         # Used messages: 'page-rss-feed' and 'page-atom-feed' (for an easier grep)
2855                                         wfMsg( "page-{$format}-feed", $this->getTitle()->getPrefixedText() )
2856                                 );
2857                         }
2858
2859                         # Recent changes feed should appear on every page (except recentchanges,
2860                         # that would be redundant). Put it after the per-page feed to avoid
2861                         # changing existing behavior. It's still available, probably via a
2862                         # menu in your browser. Some sites might have a different feed they'd
2863                         # like to promote instead of the RC feed (maybe like a "Recent New Articles"
2864                         # or "Breaking news" one). For this, we see if $wgOverrideSiteFeed is defined.
2865                         # If so, use it instead.
2866
2867                         $rctitle = SpecialPage::getTitleFor( 'Recentchanges' );
2868
2869                         if ( $wgOverrideSiteFeed ) {
2870                                 foreach ( $wgOverrideSiteFeed as $type => $feedUrl ) {
2871                                         $tags[] = $this->feedLink(
2872                                                 $type,
2873                                                 htmlspecialchars( $feedUrl ),
2874                                                 wfMsg( "site-{$type}-feed", $wgSitename )
2875                                         );
2876                                 }
2877                         } elseif ( $this->getTitle()->getPrefixedText() != $rctitle->getPrefixedText() ) {
2878                                 foreach ( $wgAdvertisedFeedTypes as $format ) {
2879                                         $tags[] = $this->feedLink(
2880                                                 $format,
2881                                                 $rctitle->getLocalURL( "feed={$format}" ),
2882                                                 wfMsg( "site-{$format}-feed", $wgSitename ) # For grep: 'site-rss-feed', 'site-atom-feed'.
2883                                         );
2884                                 }
2885                         }
2886                 }
2887                 return implode( "\n", $tags );
2888         }
2889
2890         /**
2891          * Generate a <link rel/> for a feed.
2892          *
2893          * @param $type String: feed type
2894          * @param $url String: URL to the feed
2895          * @param $text String: value of the "title" attribute
2896          * @return String: HTML fragment
2897          */
2898         private function feedLink( $type, $url, $text ) {
2899                 return Html::element( 'link', array(
2900                         'rel' => 'alternate',
2901                         'type' => "application/$type+xml",
2902                         'title' => $text,
2903                         'href' => $url )
2904                 );
2905         }
2906
2907         /**
2908          * Add a local or specified stylesheet, with the given media options.
2909          * Meant primarily for internal use...
2910          *
2911          * @param $style String: URL to the file
2912          * @param $media String: to specify a media type, 'screen', 'printable', 'handheld' or any.
2913          * @param $condition String: for IE conditional comments, specifying an IE version
2914          * @param $dir String: set to 'rtl' or 'ltr' for direction-specific sheets
2915          */
2916         public function addStyle( $style, $media = '', $condition = '', $dir = '' ) {
2917                 $options = array();
2918                 // Even though we expect the media type to be lowercase, but here we
2919                 // force it to lowercase to be safe.
2920                 if( $media ) {
2921                         $options['media'] = $media;
2922                 }
2923                 if( $condition ) {
2924                         $options['condition'] = $condition;
2925                 }
2926                 if( $dir ) {
2927                         $options['dir'] = $dir;
2928                 }
2929                 $this->styles[$style] = $options;
2930         }
2931
2932         /**
2933          * Adds inline CSS styles
2934          * @param $style_css Mixed: inline CSS
2935          */
2936         public function addInlineStyle( $style_css ){
2937                 $this->mInlineStyles .= Html::inlineStyle( $style_css );
2938         }
2939
2940         /**
2941          * Build a set of <link>s for the stylesheets specified in the $this->styles array.
2942          * These will be applied to various media & IE conditionals.
2943          *
2944          * @return string
2945          */
2946         public function buildCssLinks() {
2947                 global $wgUseSiteCss, $wgAllowUserCss, $wgAllowUserCssPrefs;
2948
2949                 $this->getSkin()->setupSkinUserCss( $this );
2950
2951                 // Add ResourceLoader styles
2952                 // Split the styles into four groups
2953                 $styles = array( 'other' => array(), 'user' => array(), 'site' => array(), 'private' => array(), 'noscript' => array() );
2954                 $resourceLoader = $this->getResourceLoader();
2955
2956                 $moduleStyles = $this->getModuleStyles();
2957
2958                 // Per-site custom styles
2959                 if ( $wgUseSiteCss ) {
2960                         $moduleStyles[] = 'site';
2961                         $moduleStyles[] = 'noscript';
2962                         if( $this->getUser()->isLoggedIn() ){
2963                                 $moduleStyles[] = 'user.groups';
2964                         }
2965                 }
2966
2967                 // Per-user custom styles
2968                 if ( $wgAllowUserCss ) {
2969                         if ( $this->getTitle()->isCssSubpage() && $this->userCanPreview() ) {
2970                                 // @todo FIXME: Properly escape the cdata!
2971                                 $this->addInlineStyle( $this->getRequest()->getText( 'wpTextbox1' ) );
2972                         } else {
2973                                 $moduleStyles[] = 'user';
2974                         }
2975                 }
2976
2977                 // Per-user preference styles
2978                 if ( $wgAllowUserCssPrefs ) {
2979                         $moduleStyles[] = 'user.options';
2980                 }
2981
2982                 foreach ( $moduleStyles as $name ) {
2983                         $group = $resourceLoader->getModule( $name )->getGroup();
2984                         // Modules in groups named "other" or anything different than "user", "site" or "private"
2985                         // will be placed in the "other" group
2986                         $styles[isset( $styles[$group] ) ? $group : 'other'][] = $name;
2987                 }
2988
2989                 // We want site, private and user styles to override dynamically added styles from modules, but we want
2990                 // dynamically added styles to override statically added styles from other modules. So the order
2991                 // has to be other, dynamic, site, private, user
2992                 // Add statically added styles for other modules
2993                 $ret = $this->makeResourceLoaderLink( $styles['other'], ResourceLoaderModule::TYPE_STYLES );
2994                 // Add normal styles added through addStyle()/addInlineStyle() here
2995                 $ret .= implode( "\n", $this->buildCssLinksArray() ) . $this->mInlineStyles;
2996                 // Add marker tag to mark the place where the client-side loader should inject dynamic styles
2997                 // We use a <meta> tag with a made-up name for this because that's valid HTML
2998                 $ret .= Html::element( 'meta', array( 'name' => 'ResourceLoaderDynamicStyles', 'content' => '' ) ) . "\n";
2999
3000                 // Add site, private and user styles
3001                 // 'private' at present only contains user.options, so put that before 'user'
3002                 // Any future private modules will likely have a similar user-specific character
3003                 foreach ( array( 'site', 'noscript', 'private', 'user' ) as $group ) {
3004                         $ret .= $this->makeResourceLoaderLink( $styles[$group],
3005                                         ResourceLoaderModule::TYPE_STYLES
3006                         );
3007                 }
3008                 return $ret;
3009         }
3010
3011         public function buildCssLinksArray() {
3012                 $links = array();
3013
3014                 // Add any extension CSS
3015                 foreach ( $this->mExtStyles as $url ) {
3016                         $this->addStyle( $url );
3017                 }
3018                 $this->mExtStyles = array();
3019
3020                 foreach( $this->styles as $file => $options ) {
3021                         $link = $this->styleLink( $file, $options );
3022                         if( $link ) {
3023                                 $links[$file] = $link;
3024                         }
3025                 }
3026                 return $links;
3027         }
3028
3029         /**
3030          * Generate \<link\> tags for stylesheets
3031          *
3032          * @param $style String: URL to the file
3033          * @param $options Array: option, can contain 'condition', 'dir', 'media'
3034          *                 keys
3035          * @return String: HTML fragment
3036          */
3037         protected function styleLink( $style, $options ) {
3038                 if( isset( $options['dir'] ) ) {
3039                         if( $this->getLang()->getDir() != $options['dir'] ) {
3040                                 return '';
3041                         }
3042                 }
3043
3044                 if( isset( $options['media'] ) ) {
3045                         $media = self::transformCssMedia( $options['media'] );
3046                         if( is_null( $media ) ) {
3047                                 return '';
3048                         }
3049                 } else {
3050                         $media = 'all';
3051                 }
3052
3053                 if( substr( $style, 0, 1 ) == '/' ||
3054                         substr( $style, 0, 5 ) == 'http:' ||
3055                         substr( $style, 0, 6 ) == 'https:' ) {
3056                         $url = $style;
3057                 } else {
3058                         global $wgStylePath, $wgStyleVersion;
3059                         $url = $wgStylePath . '/' . $style . '?' . $wgStyleVersion;
3060                 }
3061
3062                 $link = Html::linkedStyle( $url, $media );
3063
3064                 if( isset( $options['condition'] ) ) {
3065                         $condition = htmlspecialchars( $options['condition'] );
3066                         $link = "<!--[if $condition]>$link<![endif]-->";
3067                 }
3068                 return $link;
3069         }
3070
3071         /**
3072          * Transform "media" attribute based on request parameters
3073          *
3074          * @param $media String: current value of the "media" attribute
3075          * @return String: modified value of the "media" attribute
3076          */
3077         public static function transformCssMedia( $media ) {
3078                 global $wgRequest, $wgHandheldForIPhone;
3079
3080                 // Switch in on-screen display for media testing
3081                 $switches = array(
3082                         'printable' => 'print',
3083                         'handheld' => 'handheld',
3084                 );
3085                 foreach( $switches as $switch => $targetMedia ) {
3086                         if( $wgRequest->getBool( $switch ) ) {
3087                                 if( $media == $targetMedia ) {
3088                                         $media = '';
3089                                 } elseif( $media == 'screen' ) {
3090                                         return null;
3091                                 }
3092                         }
3093                 }
3094
3095                 // Expand longer media queries as iPhone doesn't grok 'handheld'
3096                 if( $wgHandheldForIPhone ) {
3097                         $mediaAliases = array(
3098                                 'screen' => 'screen and (min-device-width: 481px)',
3099                                 'handheld' => 'handheld, only screen and (max-device-width: 480px)',
3100                         );
3101
3102                         if( isset( $mediaAliases[$media] ) ) {
3103                                 $media = $mediaAliases[$media];
3104                         }
3105                 }
3106
3107                 return $media;
3108         }
3109
3110         /**
3111          * Add a wikitext-formatted message to the output.
3112          * This is equivalent to:
3113          *
3114          *    $wgOut->addWikiText( wfMsgNoTrans( ... ) )
3115          */
3116         public function addWikiMsg( /*...*/ ) {
3117                 $args = func_get_args();
3118                 $name = array_shift( $args );
3119                 $this->addWikiMsgArray( $name, $args );
3120         }
3121
3122         /**
3123          * Add a wikitext-formatted message to the output.
3124          * Like addWikiMsg() except the parameters are taken as an array
3125          * instead of a variable argument list.
3126          *
3127          * $options is passed through to wfMsgExt(), see that function for details.
3128          *
3129          * @param $name string
3130          * @param $args array
3131          * @param $options array
3132          */
3133         public function addWikiMsgArray( $name, $args, $options = array() ) {
3134                 $options[] = 'parse';
3135                 $text = wfMsgExt( $name, $options, $args );
3136                 $this->addHTML( $text );
3137         }
3138
3139         /**
3140          * This function takes a number of message/argument specifications, wraps them in
3141          * some overall structure, and then parses the result and adds it to the output.
3142          *
3143          * In the $wrap, $1 is replaced with the first message, $2 with the second, and so
3144          * on. The subsequent arguments may either be strings, in which case they are the
3145          * message names, or arrays, in which case the first element is the message name,
3146          * and subsequent elements are the parameters to that message.
3147          *
3148          * The special named parameter 'options' in a message specification array is passed
3149          * through to the $options parameter of wfMsgExt().
3150          *
3151          * Don't use this for messages that are not in users interface language.
3152          *
3153          * For example:
3154          *
3155          *    $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>", 'some-error' );
3156          *
3157          * Is equivalent to:
3158          *
3159          *    $wgOut->addWikiText( "<div class='error'>\n" . wfMsgNoTrans( 'some-error' ) . "\n</div>" );
3160          *
3161          * The newline after opening div is needed in some wikitext. See bug 19226.
3162          *
3163          * @param $wrap string
3164          */
3165         public function wrapWikiMsg( $wrap /*, ...*/ ) {
3166                 $msgSpecs = func_get_args();
3167                 array_shift( $msgSpecs );
3168                 $msgSpecs = array_values( $msgSpecs );
3169                 $s = $wrap;
3170                 foreach ( $msgSpecs as $n => $spec ) {
3171                         $options = array();
3172                         if ( is_array( $spec ) ) {
3173                                 $args = $spec;
3174                                 $name = array_shift( $args );
3175                                 if ( isset( $args['options'] ) ) {
3176                                         $options = $args['options'];
3177                                         unset( $args['options'] );
3178                                 }
3179                         }  else {
3180                                 $args = array();
3181                                 $name = $spec;
3182                         }
3183                         $s = str_replace( '$' . ( $n + 1 ), wfMsgExt( $name, $options, $args ), $s );
3184                 }
3185                 $this->addWikiText( $s );
3186         }
3187
3188         /**
3189          * Include jQuery core. Use this to avoid loading it multiple times
3190          * before we get a usable script loader.
3191          *
3192          * @param $modules Array: list of jQuery modules which should be loaded
3193          * @return Array: the list of modules which were not loaded.
3194          * @since 1.16
3195          * @deprecated since 1.17
3196          */
3197         public function includeJQuery( $modules = array() ) {
3198                 return array();
3199         }
3200
3201 }