includes/OutputPage.php

   1 <?php
   2 /**
   3  * Preparation for the final page rendering.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 /**
  24  * This class should be covered by a general architecture document which does
  25  * not exist as of January 2011.  This is one of the Core classes and should
  26  * be read at least once by any new developers.
  27  *
  28  * This class is used to prepare the final rendering. A skin is then
  29  * applied to the output parameters (links, javascript, html, categories ...).
  30  *
  31  * @todo FIXME: Another class handles sending the whole page to the client.
  32  *
  33  * Some comments comes from a pairing session between Zak Greant and Antoine Musso
  34  * in November 2010.
  35  *
  36  * @todo document
  37  */
  38 class OutputPage extends ContextSource {
  39         /// Should be private. Used with addMeta() which adds "<meta>"
  40         var $mMetatags = array();
  41
  42         var $mLinktags = array();
  43         var $mCanonicalUrl = false;
  44
  45         /// Additional stylesheets. Looks like this is for extensions. Might be replaced by resource loader.
  46         var $mExtStyles = array();
  47
  48         /// Should be private - has getter and setter. Contains the HTML title
  49         var $mPagetitle = '';
  50
  51         /// Contains all of the "<body>" content. Should be private we got set/get accessors and the append() method.
  52         var $mBodytext = '';
  53
  54         /**
  55          * Holds the debug lines that will be output as comments in page source if
  56          * $wgDebugComments is enabled. See also $wgShowDebug.
  57          * @deprecated since 1.20; use MWDebug class instead.
  58          */
  59         public $mDebugtext = '';
  60
  61         /// Should be private. Stores contents of "<title>" tag
  62         var $mHTMLtitle = '';
  63
  64         /// Should be private. Is the displayed content related to the source of the corresponding wiki article.
  65         var $mIsarticle = false;
  66
  67         /**
  68          * Should be private. Has get/set methods properly documented.
  69          * Stores "article flag" toggle.
  70          */
  71         var $mIsArticleRelated = true;
  72
  73         /**
  74          * Should be private. We have to set isPrintable(). Some pages should
  75          * never be printed (ex: redirections).
  76          */
  77         var $mPrintable = false;
  78
  79         /**
  80          * Should be private. We have set/get/append methods.
  81          *
  82          * Contains the page subtitle. Special pages usually have some links here.
  83          * Don't confuse with site subtitle added by skins.
  84          */
  85         private $mSubtitle = array();
  86
  87         var $mRedirect = '';
  88         var $mStatusCode;
  89
  90         /**
  91          * mLastModified and mEtag are used for sending cache control.
  92          * The whole caching system should probably be moved into its own class.
  93          */
  94         var $mLastModified = '';
  95
  96         /**
  97          * Should be private. No getter but used in sendCacheControl();
  98          * Contains an HTTP Entity Tags (see RFC 2616 section 3.13) which is used
  99          * as a unique identifier for the content. It is later used by the client
 100          * to compare its cached version with the server version. Client sends
 101          * headers If-Match and If-None-Match containing its locally cached ETAG value.
 102          *
 103          * To get more information, you will have to look at HTTP/1.1 protocol which
 104          * is properly described in RFC 2616 : http://tools.ietf.org/html/rfc2616
 105          */
 106         var $mETag = false;
 107
 108         var $mCategoryLinks = array();
 109         var $mCategories = array();
 110
 111         /// Should be private. Array of Interwiki Prefixed (non DB key) Titles (e.g. 'fr:Test page')
 112         var $mLanguageLinks = array();
 113
 114         /**
 115          * Should be private. Used for JavaScript (pre resource loader)
 116          * We should split js / css.
 117          * mScripts content is inserted as is in "<head>" by Skin. This might
 118          * contains either a link to a stylesheet or inline css.
 119          */
 120         var $mScripts = '';
 121
 122         /**
 123          * Inline CSS styles. Use addInlineStyle() sparingly
 124          */
 125         var $mInlineStyles = '';
 126
 127         //
 128         var $mLinkColours;
 129
 130         /**
 131          * Used by skin template.
 132          * Example: $tpl->set( 'displaytitle', $out->mPageLinkTitle );
 133          */
 134         var $mPageLinkTitle = '';
 135
 136         /// Array of elements in "<head>". Parser might add its own headers!
 137         var $mHeadItems = array();
 138
 139         // @todo FIXME: Next variables probably comes from the resource loader
 140         var $mModules = array(), $mModuleScripts = array(), $mModuleStyles = array(), $mModuleMessages = array();
 141         var $mResourceLoader;
 142         var $mJsConfigVars = array();
 143
 144         /** @todo FIXME: Is this still used ?*/
 145         var $mInlineMsg = array();
 146
 147         var $mTemplateIds = array();
 148         var $mImageTimeKeys = array();
 149
 150         var $mRedirectCode = '';
 151
 152         var $mFeedLinksAppendQuery = null;
 153
 154         # What level of 'untrustworthiness' is allowed in CSS/JS modules loaded on this page?
 155         # @see ResourceLoaderModule::$origin
 156         # ResourceLoaderModule::ORIGIN_ALL is assumed unless overridden;
 157         protected $mAllowedModules = array(
 158                 ResourceLoaderModule::TYPE_COMBINED => ResourceLoaderModule::ORIGIN_ALL,
 159         );
 160
 161         /**
 162          * @EasterEgg I just love the name for this self documenting variable.
 163          * @todo document
 164          */
 165         var $mDoNothing = false;
 166
 167         // Parser related.
 168         var $mContainsOldMagic = 0, $mContainsNewMagic = 0;
 169
 170         /**
 171          * lazy initialised, use parserOptions()
 172          * @var ParserOptions
 173          */
 174         protected $mParserOptions = null;
 175
 176         /**
 177          * Handles the atom / rss links.
 178          * We probably only support atom in 2011.
 179          * Looks like a private variable.
 180          * @see $wgAdvertisedFeedTypes
 181          */
 182         var $mFeedLinks = array();
 183
 184         // Gwicke work on squid caching? Roughly from 2003.
 185         var $mEnableClientCache = true;
 186
 187         /**
 188          * Flag if output should only contain the body of the article.
 189          * Should be private.
 190          */
 191         var $mArticleBodyOnly = false;
 192
 193         var $mNewSectionLink = false;
 194         var $mHideNewSectionLink = false;
 195
 196         /**
 197          * Comes from the parser. This was probably made to load CSS/JS only
 198          * if we had "<gallery>". Used directly in CategoryPage.php
 199          * Looks like resource loader can replace this.
 200          */
 201         var $mNoGallery = false;
 202
 203         // should be private.
 204         var $mPageTitleActionText = '';
 205         var $mParseWarnings = array();
 206
 207         // Cache stuff. Looks like mEnableClientCache
 208         var $mSquidMaxage = 0;
 209
 210         // @todo document
 211         var $mPreventClickjacking = true;
 212
 213         /// should be private. To include the variable {{REVISIONID}}
 214         var $mRevisionId = null;
 215         private $mRevisionTimestamp = null;
 216
 217         var $mFileVersion = null;
 218
 219         /**
 220          * An array of stylesheet filenames (relative from skins path), with options
 221          * for CSS media, IE conditions, and RTL/LTR direction.
 222          * For internal use; add settings in the skin via $this->addStyle()
 223          *
 224          * Style again! This seems like a code duplication since we already have
 225          * mStyles. This is what makes OpenSource amazing.
 226          */
 227         var $styles = array();
 228
 229         /**
 230          * Whether jQuery is already handled.
 231          */
 232         protected $mJQueryDone = false;
 233
 234         private $mIndexPolicy = 'index';
 235         private $mFollowPolicy = 'follow';
 236         private $mVaryHeader = array(
 237                 'Accept-Encoding' => array( 'list-contains=gzip' ),
 238         );
 239
 240         /**
 241          * If the current page was reached through a redirect, $mRedirectedFrom contains the Title
 242          * of the redirect.
 243          *
 244          * @var Title
 245          */
 246         private $mRedirectedFrom = null;
 247
 248         /**
 249          * Additional key => value data
 250          */
 251         private $mProperties = array();
 252
 253         /**
 254          * @var string|null: ResourceLoader target for load.php links. If null, will be omitted
 255          */
 256         private $mTarget = null;
 257
 258         /**
 259          * Constructor for OutputPage. This should not be called directly.
 260          * Instead a new RequestContext should be created and it will implicitly create
 261          * a OutputPage tied to that context.
 262          */
 263         function __construct( IContextSource $context = null ) {
 264                 if ( $context === null ) {
 265                         # Extensions should use `new RequestContext` instead of `new OutputPage` now.
 266                         wfDeprecated( __METHOD__, '1.18' );
 267                 } else {
 268                         $this->setContext( $context );
 269                 }
 270         }
 271
 272         /**
 273          * Redirect to $url rather than displaying the normal page
 274          *
 275          * @param string $url URL
 276          * @param string $responsecode HTTP status code
 277          */
 278         public function redirect( $url, $responsecode = '302' ) {
 279                 # Strip newlines as a paranoia check for header injection in PHP<5.1.2
 280                 $this->mRedirect = str_replace( "\n", '', $url );
 281                 $this->mRedirectCode = $responsecode;
 282         }
 283
 284         /**
 285          * Get the URL to redirect to, or an empty string if not redirect URL set
 286          *
 287          * @return String
 288          */
 289         public function getRedirect() {
 290                 return $this->mRedirect;
 291         }
 292
 293         /**
 294          * Set the HTTP status code to send with the output.
 295          *
 296          * @param $statusCode Integer
 297          */
 298         public function setStatusCode( $statusCode ) {
 299                 $this->mStatusCode = $statusCode;
 300         }
 301
 302         /**
 303          * Add a new "<meta>" tag
 304          * To add an http-equiv meta tag, precede the name with "http:"
 305          *
 306          * @param string $name tag name
 307          * @param string $val tag value
 308          */
 309         function addMeta( $name, $val ) {
 310                 array_push( $this->mMetatags, array( $name, $val ) );
 311         }
 312
 313         /**
 314          * Add a new \<link\> tag to the page header.
 315          *
 316          * Note: use setCanonicalUrl() for rel=canonical.
 317          *
 318          * @param array $linkarr associative array of attributes.
 319          */
 320         function addLink( $linkarr ) {
 321                 array_push( $this->mLinktags, $linkarr );
 322         }
 323
 324         /**
 325          * Add a new \<link\> with "rel" attribute set to "meta"
 326          *
 327          * @param array $linkarr associative array mapping attribute names to their
 328          *                 values, both keys and values will be escaped, and the
 329          *                 "rel" attribute will be automatically added
 330          */
 331         function addMetadataLink( $linkarr ) {
 332                 $linkarr['rel'] = $this->getMetadataAttribute();
 333                 $this->addLink( $linkarr );
 334         }
 335
 336         /**
 337          * Set the URL to be used for the <link rel=canonical>. This should be used
 338          * in preference to addLink(), to avoid duplicate link tags.
 339          */
 340         function setCanonicalUrl( $url ) {
 341                 $this->mCanonicalUrl = $url;
 342         }
 343
 344         /**
 345          * Get the value of the "rel" attribute for metadata links
 346          *
 347          * @return String
 348          */
 349         public function getMetadataAttribute() {
 350                 # note: buggy CC software only reads first "meta" link
 351                 static $haveMeta = false;
 352                 if ( $haveMeta ) {
 353                         return 'alternate meta';
 354                 } else {
 355                         $haveMeta = true;
 356                         return 'meta';
 357                 }
 358         }
 359
 360         /**
 361          * Add raw HTML to the list of scripts (including \<script\> tag, etc.)
 362          *
 363          * @param string $script raw HTML
 364          */
 365         function addScript( $script ) {
 366                 $this->mScripts .= $script . "\n";
 367         }
 368
 369         /**
 370          * Register and add a stylesheet from an extension directory.
 371          *
 372          * @param string $url path to sheet.  Provide either a full url (beginning
 373          *             with 'http', etc) or a relative path from the document root
 374          *             (beginning with '/').  Otherwise it behaves identically to
 375          *             addStyle() and draws from the /skins folder.
 376          */
 377         public function addExtensionStyle( $url ) {
 378                 array_push( $this->mExtStyles, $url );
 379         }
 380
 381         /**
 382          * Get all styles added by extensions
 383          *
 384          * @return Array
 385          */
 386         function getExtStyle() {
 387                 return $this->mExtStyles;
 388         }
 389
 390         /**
 391          * Add a JavaScript file out of skins/common, or a given relative path.
 392          *
 393          * @param string $file filename in skins/common or complete on-server path
 394          *              (/foo/bar.js)
 395          * @param string $version style version of the file. Defaults to $wgStyleVersion
 396          */
 397         public function addScriptFile( $file, $version = null ) {
 398                 global $wgStylePath, $wgStyleVersion;
 399                 // See if $file parameter is an absolute URL or begins with a slash
 400                 if ( substr( $file, 0, 1 ) == '/' || preg_match( '#^[a-z]*://#i', $file ) ) {
 401                         $path = $file;
 402                 } else {
 403                         $path = "{$wgStylePath}/common/{$file}";
 404                 }
 405                 if ( is_null( $version ) ) {
 406                         $version = $wgStyleVersion;
 407                 }
 408                 $this->addScript( Html::linkedScript( wfAppendQuery( $path, $version ) ) );
 409         }
 410
 411         /**
 412          * Add a self-contained script tag with the given contents
 413          *
 414          * @param string $script JavaScript text, no "<script>" tags
 415          */
 416         public function addInlineScript( $script ) {
 417                 $this->mScripts .= Html::inlineScript( "\n$script\n" ) . "\n";
 418         }
 419
 420         /**
 421          * Get all registered JS and CSS tags for the header.
 422          *
 423          * @return String
 424          */
 425         function getScript() {
 426                 return $this->mScripts . $this->getHeadItems();
 427         }
 428
 429         /**
 430          * Filter an array of modules to remove insufficiently trustworthy members, and modules
 431          * which are no longer registered (eg a page is cached before an extension is disabled)
 432          * @param $modules Array
 433          * @param string $position if not null, only return modules with this position
 434          * @param $type string
 435          * @return Array
 436          */
 437         protected function filterModules( $modules, $position = null, $type = ResourceLoaderModule::TYPE_COMBINED ) {
 438                 $resourceLoader = $this->getResourceLoader();
 439                 $filteredModules = array();
 440                 foreach ( $modules as $val ) {
 441                         $module = $resourceLoader->getModule( $val );
 442                         if ( $module instanceof ResourceLoaderModule
 443                                 && $module->getOrigin() <= $this->getAllowedModules( $type )
 444                                 && ( is_null( $position ) || $module->getPosition() == $position )
 445                                 && ( !$this->mTarget || in_array( $this->mTarget, $module->getTargets() ) ) )
 446                         {
 447                                 $filteredModules[] = $val;
 448                         }
 449                 }
 450                 return $filteredModules;
 451         }
 452
 453         /**
 454          * Get the list of modules to include on this page
 455          *
 456          * @param bool $filter whether to filter out insufficiently trustworthy modules
 457          * @param string $position if not null, only return modules with this position
 458          * @param $param string
 459          * @return Array of module names
 460          */
 461         public function getModules( $filter = false, $position = null, $param = 'mModules' ) {
 462                 $modules = array_values( array_unique( $this->$param ) );
 463                 return $filter
 464                         ? $this->filterModules( $modules, $position )
 465                         : $modules;
 466         }
 467
 468         /**
 469          * Add one or more modules recognized by the resource loader. Modules added
 470          * through this function will be loaded by the resource loader when the
 471          * page loads.
 472          *
 473          * @param $modules Mixed: module name (string) or array of module names
 474          */
 475         public function addModules( $modules ) {
 476                 $this->mModules = array_merge( $this->mModules, (array)$modules );
 477         }
 478
 479         /**
 480          * Get the list of module JS to include on this page
 481          *
 482          * @param $filter
 483          * @param $position
 484          *
 485          * @return array of module names
 486          */
 487         public function getModuleScripts( $filter = false, $position = null ) {
 488                 return $this->getModules( $filter, $position, 'mModuleScripts' );
 489         }
 490
 491         /**
 492          * Add only JS of one or more modules recognized by the resource loader. Module
 493          * scripts added through this function will be loaded by the resource loader when
 494          * the page loads.
 495          *
 496          * @param $modules Mixed: module name (string) or array of module names
 497          */
 498         public function addModuleScripts( $modules ) {
 499                 $this->mModuleScripts = array_merge( $this->mModuleScripts, (array)$modules );
 500         }
 501
 502         /**
 503          * Get the list of module CSS to include on this page
 504          *
 505          * @param $filter
 506          * @param $position
 507          *
 508          * @return Array of module names
 509          */
 510         public function getModuleStyles( $filter = false, $position = null ) {
 511                 return $this->getModules( $filter, $position, 'mModuleStyles' );
 512         }
 513
 514         /**
 515          * Add only CSS of one or more modules recognized by the resource loader.
 516          *
 517          * Module styles added through this function will be added using standard link CSS
 518          * tags, rather than as a combined Javascript and CSS package. Thus, they will
 519          * load when JavaScript is disabled (unless CSS also happens to be disabled).
 520          *
 521          * @param $modules Mixed: module name (string) or array of module names
 522          */
 523         public function addModuleStyles( $modules ) {
 524                 $this->mModuleStyles = array_merge( $this->mModuleStyles, (array)$modules );
 525         }
 526
 527         /**
 528          * Get the list of module messages to include on this page
 529          *
 530          * @param $filter
 531          * @param $position
 532          *
 533          * @return Array of module names
 534          */
 535         public function getModuleMessages( $filter = false, $position = null ) {
 536                 return $this->getModules( $filter, $position, 'mModuleMessages' );
 537         }
 538
 539         /**
 540          * Add only messages of one or more modules recognized by the resource loader.
 541          * Module messages added through this function will be loaded by the resource
 542          * loader when the page loads.
 543          *
 544          * @param $modules Mixed: module name (string) or array of module names
 545          */
 546         public function addModuleMessages( $modules ) {
 547                 $this->mModuleMessages = array_merge( $this->mModuleMessages, (array)$modules );
 548         }
 549
 550         /**
 551          * @return null|string: ResourceLoader target
 552          */
 553         public function getTarget() {
 554                 return $this->mTarget;
 555         }
 556
 557         /**
 558          * Sets ResourceLoader target for load.php links. If null, will be omitted
 559          *
 560          * @param $target string|null
 561          */
 562         public function setTarget( $target ) {
 563                 $this->mTarget = $target;
 564         }
 565
 566         /**
 567          * Get an array of head items
 568          *
 569          * @return Array
 570          */
 571         function getHeadItemsArray() {
 572                 return $this->mHeadItems;
 573         }
 574
 575         /**
 576          * Get all header items in a string
 577          *
 578          * @return String
 579          */
 580         function getHeadItems() {
 581                 $s = '';
 582                 foreach ( $this->mHeadItems as $item ) {
 583                         $s .= $item;
 584                 }
 585                 return $s;
 586         }
 587
 588         /**
 589          * Add or replace an header item to the output
 590          *
 591          * @param string $name item name
 592          * @param string $value raw HTML
 593          */
 594         public function addHeadItem( $name, $value ) {
 595                 $this->mHeadItems[$name] = $value;
 596         }
 597
 598         /**
 599          * Check if the header item $name is already set
 600          *
 601          * @param string $name item name
 602          * @return Boolean
 603          */
 604         public function hasHeadItem( $name ) {
 605                 return isset( $this->mHeadItems[$name] );
 606         }
 607
 608         /**
 609          * Set the value of the ETag HTTP header, only used if $wgUseETag is true
 610          *
 611          * @param string $tag value of "ETag" header
 612          */
 613         function setETag( $tag ) {
 614                 $this->mETag = $tag;
 615         }
 616
 617         /**
 618          * Set whether the output should only contain the body of the article,
 619          * without any skin, sidebar, etc.
 620          * Used e.g. when calling with "action=render".
 621          *
 622          * @param $only Boolean: whether to output only the body of the article
 623          */
 624         public function setArticleBodyOnly( $only ) {
 625                 $this->mArticleBodyOnly = $only;
 626         }
 627
 628         /**
 629          * Return whether the output will contain only the body of the article
 630          *
 631          * @return Boolean
 632          */
 633         public function getArticleBodyOnly() {
 634                 return $this->mArticleBodyOnly;
 635         }
 636
 637         /**
 638          * Set an additional output property
 639          * @since 1.21
 640          *
 641          * @param string $name
 642          * @param mixed $value
 643          */
 644         public function setProperty( $name, $value ) {
 645                 $this->mProperties[$name] = $value;
 646         }
 647
 648         /**
 649          * Get an additional output property
 650          * @since 1.21
 651          *
 652          * @param $name
 653          * @return mixed: Property value or null if not found
 654          */
 655         public function getProperty( $name ) {
 656                 if ( isset( $this->mProperties[$name] ) ) {
 657                         return $this->mProperties[$name];
 658                 } else {
 659                         return null;
 660                 }
 661         }
 662
 663         /**
 664          * checkLastModified tells the client to use the client-cached page if
 665          * possible. If successful, the OutputPage is disabled so that
 666          * any future call to OutputPage->output() have no effect.
 667          *
 668          * Side effect: sets mLastModified for Last-Modified header
 669          *
 670          * @param $timestamp string
 671          *
 672          * @return Boolean: true iff cache-ok headers was sent.
 673          */
 674         public function checkLastModified( $timestamp ) {
 675                 global $wgCachePages, $wgCacheEpoch, $wgUseSquid, $wgSquidMaxage;
 676
 677                 if ( !$timestamp || $timestamp == '19700101000000' ) {
 678                         wfDebug( __METHOD__ . ": CACHE DISABLED, NO TIMESTAMP\n" );
 679                         return false;
 680                 }
 681                 if ( !$wgCachePages ) {
 682                         wfDebug( __METHOD__ . ": CACHE DISABLED\n", false );
 683                         return false;
 684                 }
 685                 if ( $this->getUser()->getOption( 'nocache' ) ) {
 686                         wfDebug( __METHOD__ . ": USER DISABLED CACHE\n", false );
 687                         return false;
 688                 }
 689
 690                 $timestamp = wfTimestamp( TS_MW, $timestamp );
 691                 $modifiedTimes = array(
 692                         'page' => $timestamp,
 693                         'user' => $this->getUser()->getTouched(),
 694                         'epoch' => $wgCacheEpoch
 695                 );
 696                 if ( $wgUseSquid ) {
 697                         // bug 44570: the core page itself may not change, but resources might
 698                         $modifiedTimes['sepoch'] = wfTimestamp( TS_MW, time() - $wgSquidMaxage );
 699                 }
 700                 wfRunHooks( 'OutputPageCheckLastModified', array( &$modifiedTimes ) );
 701
 702                 $maxModified = max( $modifiedTimes );
 703                 $this->mLastModified = wfTimestamp( TS_RFC2822, $maxModified );
 704
 705                 $clientHeader = $this->getRequest()->getHeader( 'If-Modified-Since' );
 706                 if ( $clientHeader === false ) {
 707                         wfDebug( __METHOD__ . ": client did not send If-Modified-Since header\n", false );
 708                         return false;
 709                 }
 710
 711                 # IE sends sizes after the date like this:
 712                 # Wed, 20 Aug 2003 06:51:19 GMT; length=5202
 713                 # this breaks strtotime().
 714                 $clientHeader = preg_replace( '/;.*$/', '', $clientHeader );
 715
 716                 wfSuppressWarnings(); // E_STRICT system time bitching
 717                 $clientHeaderTime = strtotime( $clientHeader );
 718                 wfRestoreWarnings();
 719                 if ( !$clientHeaderTime ) {
 720                         wfDebug( __METHOD__ . ": unable to parse the client's If-Modified-Since header: $clientHeader\n" );
 721                         return false;
 722                 }
 723                 $clientHeaderTime = wfTimestamp( TS_MW, $clientHeaderTime );
 724
 725                 # Make debug info
 726                 $info = '';
 727                 foreach ( $modifiedTimes as $name => $value ) {
 728                         if ( $info !== '' ) {
 729                                 $info .= ', ';
 730                         }
 731                         $info .= "$name=" . wfTimestamp( TS_ISO_8601, $value );
 732                 }
 733
 734                 wfDebug( __METHOD__ . ": client sent If-Modified-Since: " .
 735                         wfTimestamp( TS_ISO_8601, $clientHeaderTime ) . "\n", false );
 736                 wfDebug( __METHOD__ . ": effective Last-Modified: " .
 737                         wfTimestamp( TS_ISO_8601, $maxModified ) . "\n", false );
 738                 if ( $clientHeaderTime < $maxModified ) {
 739                         wfDebug( __METHOD__ . ": STALE, $info\n", false );
 740                         return false;
 741                 }
 742
 743                 # Not modified
 744                 # Give a 304 response code and disable body output
 745                 wfDebug( __METHOD__ . ": NOT MODIFIED, $info\n", false );
 746                 ini_set( 'zlib.output_compression', 0 );
 747                 $this->getRequest()->response()->header( "HTTP/1.1 304 Not Modified" );
 748                 $this->sendCacheControl();
 749                 $this->disable();
 750
 751                 // Don't output a compressed blob when using ob_gzhandler;
 752                 // it's technically against HTTP spec and seems to confuse
 753                 // Firefox when the response gets split over two packets.
 754                 wfClearOutputBuffers();
 755
 756                 return true;
 757         }
 758
 759         /**
 760          * Override the last modified timestamp
 761          *
 762          * @param string $timestamp new timestamp, in a format readable by
 763          *        wfTimestamp()
 764          */
 765         public function setLastModified( $timestamp ) {
 766                 $this->mLastModified = wfTimestamp( TS_RFC2822, $timestamp );
 767         }
 768
 769         /**
 770          * Set the robot policy for the page: <http://www.robotstxt.org/meta.html>
 771          *
 772          * @param string $policy the literal string to output as the contents of
 773          *   the meta tag.  Will be parsed according to the spec and output in
 774          *   standardized form.
 775          * @return null
 776          */
 777         public function setRobotPolicy( $policy ) {
 778                 $policy = Article::formatRobotPolicy( $policy );
 779
 780                 if ( isset( $policy['index'] ) ) {
 781                         $this->setIndexPolicy( $policy['index'] );
 782                 }
 783                 if ( isset( $policy['follow'] ) ) {
 784                         $this->setFollowPolicy( $policy['follow'] );
 785                 }
 786         }
 787
 788         /**
 789          * Set the index policy for the page, but leave the follow policy un-
 790          * touched.
 791          *
 792          * @param string $policy Either 'index' or 'noindex'.
 793          * @return null
 794          */
 795         public function setIndexPolicy( $policy ) {
 796                 $policy = trim( $policy );
 797                 if ( in_array( $policy, array( 'index', 'noindex' ) ) ) {
 798                         $this->mIndexPolicy = $policy;
 799                 }
 800         }
 801
 802         /**
 803          * Set the follow policy for the page, but leave the index policy un-
 804          * touched.
 805          *
 806          * @param string $policy either 'follow' or 'nofollow'.
 807          * @return null
 808          */
 809         public function setFollowPolicy( $policy ) {
 810                 $policy = trim( $policy );
 811                 if ( in_array( $policy, array( 'follow', 'nofollow' ) ) ) {
 812                         $this->mFollowPolicy = $policy;
 813                 }
 814         }
 815
 816         /**
 817          * Set the new value of the "action text", this will be added to the
 818          * "HTML title", separated from it with " - ".
 819          *
 820          * @param string $text new value of the "action text"
 821          */
 822         public function setPageTitleActionText( $text ) {
 823                 $this->mPageTitleActionText = $text;
 824         }
 825
 826         /**
 827          * Get the value of the "action text"
 828          *
 829          * @return String
 830          */
 831         public function getPageTitleActionText() {
 832                 if ( isset( $this->mPageTitleActionText ) ) {
 833                         return $this->mPageTitleActionText;
 834                 }
 835                 return '';
 836         }
 837
 838         /**
 839          * "HTML title" means the contents of "<title>".
 840          * It is stored as plain, unescaped text and will be run through htmlspecialchars in the skin file.
 841          *
 842          * @param $name string
 843          */
 844         public function setHTMLTitle( $name ) {
 845                 if ( $name instanceof Message ) {
 846                         $this->mHTMLtitle = $name->setContext( $this->getContext() )->text();
 847                 } else {
 848                         $this->mHTMLtitle = $name;
 849                 }
 850         }
 851
 852         /**
 853          * Return the "HTML title", i.e. the content of the "<title>" tag.
 854          *
 855          * @return String
 856          */
 857         public function getHTMLTitle() {
 858                 return $this->mHTMLtitle;
 859         }
 860
 861         /**
 862          * Set $mRedirectedFrom, the Title of the page which redirected us to the current page.
 863          *
 864          * @param $t Title
 865          */
 866         public function setRedirectedFrom( $t ) {
 867                 $this->mRedirectedFrom = $t;
 868         }
 869
 870         /**
 871          * "Page title" means the contents of \<h1\>. It is stored as a valid HTML fragment.
 872          * This function allows good tags like \<sup\> in the \<h1\> tag, but not bad tags like \<script\>.
 873          * This function automatically sets \<title\> to the same content as \<h1\> but with all tags removed.
 874          * Bad tags that were escaped in \<h1\> will still be escaped in \<title\>, and good tags like \<i\> will be dropped entirely.
 875          *
 876          * @param $name string|Message
 877          */
 878         public function setPageTitle( $name ) {
 879                 if ( $name instanceof Message ) {
 880                         $name = $name->setContext( $this->getContext() )->text();
 881                 }
 882
 883                 # change "<script>foo&bar</script>" to "&lt;script&gt;foo&amp;bar&lt;/script&gt;"
 884                 # but leave "<i>foobar</i>" alone
 885                 $nameWithTags = Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags( $name ) );
 886                 $this->mPagetitle = $nameWithTags;
 887
 888                 # change "<i>foo&amp;bar</i>" to "foo&bar"
 889                 $this->setHTMLTitle( $this->msg( 'pagetitle' )->rawParams( Sanitizer::stripAllTags( $nameWithTags ) ) );
 890         }
 891
 892         /**
 893          * Return the "page title", i.e. the content of the \<h1\> tag.
 894          *
 895          * @return String
 896          */
 897         public function getPageTitle() {
 898                 return $this->mPagetitle;
 899         }
 900
 901         /**
 902          * Set the Title object to use
 903          *
 904          * @param $t Title object
 905          */
 906         public function setTitle( Title $t ) {
 907                 $this->getContext()->setTitle( $t );
 908         }
 909
 910         /**
 911          * Replace the subtitle with $str
 912          *
 913          * @param string|Message $str new value of the subtitle. String should be safe HTML.
 914          */
 915         public function setSubtitle( $str ) {
 916                 $this->clearSubtitle();
 917                 $this->addSubtitle( $str );
 918         }
 919
 920         /**
 921          * Add $str to the subtitle
 922          *
 923          * @deprecated in 1.19; use addSubtitle() instead
 924          * @param string|Message $str to add to the subtitle
 925          */
 926         public function appendSubtitle( $str ) {
 927                 $this->addSubtitle( $str );
 928         }
 929
 930         /**
 931          * Add $str to the subtitle
 932          *
 933          * @param string|Message $str to add to the subtitle. String should be safe HTML.
 934          */
 935         public function addSubtitle( $str ) {
 936                 if ( $str instanceof Message ) {
 937                         $this->mSubtitle[] = $str->setContext( $this->getContext() )->parse();
 938                 } else {
 939                         $this->mSubtitle[] = $str;
 940                 }
 941         }
 942
 943         /**
 944          * Add a subtitle containing a backlink to a page
 945          *
 946          * @param $title Title to link to
 947          */
 948         public function addBacklinkSubtitle( Title $title ) {
 949                 $query = array();
 950                 if ( $title->isRedirect() ) {
 951                         $query['redirect'] = 'no';
 952                 }
 953                 $this->addSubtitle( $this->msg( 'backlinksubtitle' )->rawParams( Linker::link( $title, null, array(), $query ) ) );
 954         }
 955
 956         /**
 957          * Clear the subtitles
 958          */
 959         public function clearSubtitle() {
 960                 $this->mSubtitle = array();
 961         }
 962
 963         /**
 964          * Get the subtitle
 965          *
 966          * @return String
 967          */
 968         public function getSubtitle() {
 969                 return implode( "<br />\n\t\t\t\t", $this->mSubtitle );
 970         }
 971
 972         /**
 973          * Set the page as printable, i.e. it'll be displayed with with all
 974          * print styles included
 975          */
 976         public function setPrintable() {
 977                 $this->mPrintable = true;
 978         }
 979
 980         /**
 981          * Return whether the page is "printable"
 982          *
 983          * @return Boolean
 984          */
 985         public function isPrintable() {
 986                 return $this->mPrintable;
 987         }
 988
 989         /**
 990          * Disable output completely, i.e. calling output() will have no effect
 991          */
 992         public function disable() {
 993                 $this->mDoNothing = true;
 994         }
 995
 996         /**
 997          * Return whether the output will be completely disabled
 998          *
 999          * @return Boolean
1000          */
1001         public function isDisabled() {
1002                 return $this->mDoNothing;
1003         }
1004
1005         /**
1006          * Show an "add new section" link?
1007          *
1008          * @return Boolean
1009          */
1010         public function showNewSectionLink() {
1011                 return $this->mNewSectionLink;
1012         }
1013
1014         /**
1015          * Forcibly hide the new section link?
1016          *
1017          * @return Boolean
1018          */
1019         public function forceHideNewSectionLink() {
1020                 return $this->mHideNewSectionLink;
1021         }
1022
1023         /**
1024          * Add or remove feed links in the page header
1025          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
1026          * for the new version
1027          * @see addFeedLink()
1028          *
1029          * @param $show Boolean: true: add default feeds, false: remove all feeds
1030          */
1031         public function setSyndicated( $show = true ) {
1032                 if ( $show ) {
1033                         $this->setFeedAppendQuery( false );
1034                 } else {
1035                         $this->mFeedLinks = array();
1036                 }
1037         }
1038
1039         /**
1040          * Add default feeds to the page header
1041          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
1042          * for the new version
1043          * @see addFeedLink()
1044          *
1045          * @param string $val query to append to feed links or false to output
1046          *        default links
1047          */
1048         public function setFeedAppendQuery( $val ) {
1049                 global $wgAdvertisedFeedTypes;
1050
1051                 $this->mFeedLinks = array();
1052
1053                 foreach ( $wgAdvertisedFeedTypes as $type ) {
1054                         $query = "feed=$type";
1055                         if ( is_string( $val ) ) {
1056                                 $query .= '&' . $val;
1057                         }
1058                         $this->mFeedLinks[$type] = $this->getTitle()->getLocalURL( $query );
1059                 }
1060         }
1061
1062         /**
1063          * Add a feed link to the page header
1064          *
1065          * @param string $format feed type, should be a key of $wgFeedClasses
1066          * @param string $href URL
1067          */
1068         public function addFeedLink( $format, $href ) {
1069                 global $wgAdvertisedFeedTypes;
1070
1071                 if ( in_array( $format, $wgAdvertisedFeedTypes ) ) {
1072                         $this->mFeedLinks[$format] = $href;
1073                 }
1074         }
1075
1076         /**
1077          * Should we output feed links for this page?
1078          * @return Boolean
1079          */
1080         public function isSyndicated() {
1081                 return count( $this->mFeedLinks ) > 0;
1082         }
1083
1084         /**
1085          * Return URLs for each supported syndication format for this page.
1086          * @return array associating format keys with URLs
1087          */
1088         public function getSyndicationLinks() {
1089                 return $this->mFeedLinks;
1090         }
1091
1092         /**
1093          * Will currently always return null
1094          *
1095          * @return null
1096          */
1097         public function getFeedAppendQuery() {
1098                 return $this->mFeedLinksAppendQuery;
1099         }
1100
1101         /**
1102          * Set whether the displayed content is related to the source of the
1103          * corresponding article on the wiki
1104          * Setting true will cause the change "article related" toggle to true
1105          *
1106          * @param $v Boolean
1107          */
1108         public function setArticleFlag( $v ) {
1109                 $this->mIsarticle = $v;
1110                 if ( $v ) {
1111                         $this->mIsArticleRelated = $v;
1112                 }
1113         }
1114
1115         /**
1116          * Return whether the content displayed page is related to the source of
1117          * the corresponding article on the wiki
1118          *
1119          * @return Boolean
1120          */
1121         public function isArticle() {
1122                 return $this->mIsarticle;
1123         }
1124
1125         /**
1126          * Set whether this page is related an article on the wiki
1127          * Setting false will cause the change of "article flag" toggle to false
1128          *
1129          * @param $v Boolean
1130          */
1131         public function setArticleRelated( $v ) {
1132                 $this->mIsArticleRelated = $v;
1133                 if ( !$v ) {
1134                         $this->mIsarticle = false;
1135                 }
1136         }
1137
1138         /**
1139          * Return whether this page is related an article on the wiki
1140          *
1141          * @return Boolean
1142          */
1143         public function isArticleRelated() {
1144                 return $this->mIsArticleRelated;
1145         }
1146
1147         /**
1148          * Add new language links
1149          *
1150          * @param array $newLinkArray Associative array mapping language code to the page
1151          *                      name
1152          */
1153         public function addLanguageLinks( $newLinkArray ) {
1154                 $this->mLanguageLinks += $newLinkArray;
1155         }
1156
1157         /**
1158          * Reset the language links and add new language links
1159          *
1160          * @param array $newLinkArray Associative array mapping language code to the page
1161          *                      name
1162          */
1163         public function setLanguageLinks( $newLinkArray ) {
1164                 $this->mLanguageLinks = $newLinkArray;
1165         }
1166
1167         /**
1168          * Get the list of language links
1169          *
1170          * @return Array of Interwiki Prefixed (non DB key) Titles (e.g. 'fr:Test page')
1171          */
1172         public function getLanguageLinks() {
1173                 return $this->mLanguageLinks;
1174         }
1175
1176         /**
1177          * Add an array of categories, with names in the keys
1178          *
1179          * @param array $categories mapping category name => sort key
1180          */
1181         public function addCategoryLinks( $categories ) {
1182                 global $wgContLang;
1183
1184                 if ( !is_array( $categories ) || count( $categories ) == 0 ) {
1185                         return;
1186                 }
1187
1188                 # Add the links to a LinkBatch
1189                 $arr = array( NS_CATEGORY => $categories );
1190                 $lb = new LinkBatch;
1191                 $lb->setArray( $arr );
1192
1193                 # Fetch existence plus the hiddencat property
1194                 $dbr = wfGetDB( DB_SLAVE );
1195                 $res = $dbr->select( array( 'page', 'page_props' ),
1196                         array( 'page_id', 'page_namespace', 'page_title', 'page_len', 'page_is_redirect', 'page_latest', 'pp_value' ),
1197                         $lb->constructSet( 'page', $dbr ),
1198                         __METHOD__,
1199                         array(),
1200                         array( 'page_props' => array( 'LEFT JOIN', array( 'pp_propname' => 'hiddencat', 'pp_page = page_id' ) ) )
1201                 );
1202
1203                 # Add the results to the link cache
1204                 $lb->addResultToCache( LinkCache::singleton(), $res );
1205
1206                 # Set all the values to 'normal'. This can be done with array_fill_keys in PHP 5.2.0+
1207                 $categories = array_combine(
1208                         array_keys( $categories ),
1209                         array_fill( 0, count( $categories ), 'normal' )
1210                 );
1211
1212                 # Mark hidden categories
1213                 foreach ( $res as $row ) {
1214                         if ( isset( $row->pp_value ) ) {
1215                                 $categories[$row->page_title] = 'hidden';
1216                         }
1217                 }
1218
1219                 # Add the remaining categories to the skin
1220                 if ( wfRunHooks( 'OutputPageMakeCategoryLinks', array( &$this, $categories, &$this->mCategoryLinks ) ) ) {
1221                         foreach ( $categories as $category => $type ) {
1222                                 $origcategory = $category;
1223                                 $title = Title::makeTitleSafe( NS_CATEGORY, $category );
1224                                 $wgContLang->findVariantLink( $category, $title, true );
1225                                 if ( $category != $origcategory ) {
1226                                         if ( array_key_exists( $category, $categories ) ) {
1227                                                 continue;
1228                                         }
1229                                 }
1230                                 $text = $wgContLang->convertHtml( $title->getText() );
1231                                 $this->mCategories[] = $title->getText();
1232                                 $this->mCategoryLinks[$type][] = Linker::link( $title, $text );
1233                         }
1234                 }
1235         }
1236
1237         /**
1238          * Reset the category links (but not the category list) and add $categories
1239          *
1240          * @param array $categories mapping category name => sort key
1241          */
1242         public function setCategoryLinks( $categories ) {
1243                 $this->mCategoryLinks = array();
1244                 $this->addCategoryLinks( $categories );
1245         }
1246
1247         /**
1248          * Get the list of category links, in a 2-D array with the following format:
1249          * $arr[$type][] = $link, where $type is either "normal" or "hidden" (for
1250          * hidden categories) and $link a HTML fragment with a link to the category
1251          * page
1252          *
1253          * @return Array
1254          */
1255         public function getCategoryLinks() {
1256                 return $this->mCategoryLinks;
1257         }
1258
1259         /**
1260          * Get the list of category names this page belongs to
1261          *
1262          * @return Array of strings
1263          */
1264         public function getCategories() {
1265                 return $this->mCategories;
1266         }
1267
1268         /**
1269          * Do not allow scripts which can be modified by wiki users to load on this page;
1270          * only allow scripts bundled with, or generated by, the software.
1271          */
1272         public function disallowUserJs() {
1273                 $this->reduceAllowedModules(
1274                         ResourceLoaderModule::TYPE_SCRIPTS,
1275                         ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL
1276                 );
1277         }
1278
1279         /**
1280          * Return whether user JavaScript is allowed for this page
1281          * @deprecated since 1.18 Load modules with ResourceLoader, and origin and
1282          *     trustworthiness is identified and enforced automagically.
1283          * @return Boolean
1284          */
1285         public function isUserJsAllowed() {
1286                 wfDeprecated( __METHOD__, '1.18' );
1287                 return $this->getAllowedModules( ResourceLoaderModule::TYPE_SCRIPTS ) >= ResourceLoaderModule::ORIGIN_USER_INDIVIDUAL;
1288         }
1289
1290         /**
1291          * Show what level of JavaScript / CSS untrustworthiness is allowed on this page
1292          * @see ResourceLoaderModule::$origin
1293          * @param string $type ResourceLoaderModule TYPE_ constant
1294          * @return Int ResourceLoaderModule ORIGIN_ class constant
1295          */
1296         public function getAllowedModules( $type ) {
1297                 if ( $type == ResourceLoaderModule::TYPE_COMBINED ) {
1298                         return min( array_values( $this->mAllowedModules ) );
1299                 } else {
1300                         return isset( $this->mAllowedModules[$type] )
1301                                 ? $this->mAllowedModules[$type]
1302                                 : ResourceLoaderModule::ORIGIN_ALL;
1303                 }
1304         }
1305
1306         /**
1307          * Set the highest level of CSS/JS untrustworthiness allowed
1308          * @param  $type String ResourceLoaderModule TYPE_ constant
1309          * @param  $level Int ResourceLoaderModule class constant
1310          */
1311         public function setAllowedModules( $type, $level ) {
1312                 $this->mAllowedModules[$type] = $level;
1313         }
1314
1315         /**
1316          * As for setAllowedModules(), but don't inadvertently make the page more accessible
1317          * @param  $type String
1318          * @param  $level Int ResourceLoaderModule class constant
1319          */
1320         public function reduceAllowedModules( $type, $level ) {
1321                 $this->mAllowedModules[$type] = min( $this->getAllowedModules( $type ), $level );
1322         }
1323
1324         /**
1325          * Prepend $text to the body HTML
1326          *
1327          * @param string $text HTML
1328          */
1329         public function prependHTML( $text ) {
1330                 $this->mBodytext = $text . $this->mBodytext;
1331         }
1332
1333         /**
1334          * Append $text to the body HTML
1335          *
1336          * @param string $text HTML
1337          */
1338         public function addHTML( $text ) {
1339                 $this->mBodytext .= $text;
1340         }
1341
1342         /**
1343          * Shortcut for adding an Html::element via addHTML.
1344          *
1345          * @since 1.19
1346          *
1347          * @param $element string
1348          * @param $attribs array
1349          * @param $contents string
1350          */
1351         public function addElement( $element, $attribs = array(), $contents = '' ) {
1352                 $this->addHTML( Html::element( $element, $attribs, $contents ) );
1353         }
1354
1355         /**
1356          * Clear the body HTML
1357          */
1358         public function clearHTML() {
1359                 $this->mBodytext = '';
1360         }
1361
1362         /**
1363          * Get the body HTML
1364          *
1365          * @return String: HTML
1366          */
1367         public function getHTML() {
1368                 return $this->mBodytext;
1369         }
1370
1371         /**
1372          * Get/set the ParserOptions object to use for wikitext parsing
1373          *
1374          * @param $options ParserOptions|null either the ParserOption to use or null to only get the
1375          *                 current ParserOption object
1376          * @return ParserOptions object
1377          */
1378         public function parserOptions( $options = null ) {
1379                 if ( !$this->mParserOptions ) {
1380                         $this->mParserOptions = ParserOptions::newFromContext( $this->getContext() );
1381                         $this->mParserOptions->setEditSection( false );
1382                 }
1383                 return wfSetVar( $this->mParserOptions, $options );
1384         }
1385
1386         /**
1387          * Set the revision ID which will be seen by the wiki text parser
1388          * for things such as embedded {{REVISIONID}} variable use.
1389          *
1390          * @param $revid Mixed: an positive integer, or null
1391          * @return Mixed: previous value
1392          */
1393         public function setRevisionId( $revid ) {
1394                 $val = is_null( $revid ) ? null : intval( $revid );
1395                 return wfSetVar( $this->mRevisionId, $val );
1396         }
1397
1398         /**
1399          * Get the displayed revision ID
1400          *
1401          * @return Integer
1402          */
1403         public function getRevisionId() {
1404                 return $this->mRevisionId;
1405         }
1406
1407         /**
1408          * Set the timestamp of the revision which will be displayed. This is used
1409          * to avoid a extra DB call in Skin::lastModified().
1410          *
1411          * @param $timestamp Mixed: string, or null
1412          * @return Mixed: previous value
1413          */
1414         public function setRevisionTimestamp( $timestamp ) {
1415                 return wfSetVar( $this->mRevisionTimestamp, $timestamp );
1416         }
1417
1418         /**
1419          * Get the timestamp of displayed revision.
1420          * This will be null if not filled by setRevisionTimestamp().
1421          *
1422          * @return String or null
1423          */
1424         public function getRevisionTimestamp() {
1425                 return $this->mRevisionTimestamp;
1426         }
1427
1428         /**
1429          * Set the displayed file version
1430          *
1431          * @param $file File|bool
1432          * @return Mixed: previous value
1433          */
1434         public function setFileVersion( $file ) {
1435                 $val = null;
1436                 if ( $file instanceof File && $file->exists() ) {
1437                         $val = array( 'time' => $file->getTimestamp(), 'sha1' => $file->getSha1() );
1438                 }
1439                 return wfSetVar( $this->mFileVersion, $val, true );
1440         }
1441
1442         /**
1443          * Get the displayed file version
1444          *
1445          * @return Array|null ('time' => MW timestamp, 'sha1' => sha1)
1446          */
1447         public function getFileVersion() {
1448                 return $this->mFileVersion;
1449         }
1450
1451         /**
1452          * Get the templates used on this page
1453          *
1454          * @return Array (namespace => dbKey => revId)
1455          * @since 1.18
1456          */
1457         public function getTemplateIds() {
1458                 return $this->mTemplateIds;
1459         }
1460
1461         /**
1462          * Get the files used on this page
1463          *
1464          * @return Array (dbKey => array('time' => MW timestamp or null, 'sha1' => sha1 or ''))
1465          * @since 1.18
1466          */
1467         public function getFileSearchOptions() {
1468                 return $this->mImageTimeKeys;
1469         }
1470
1471         /**
1472          * Convert wikitext to HTML and add it to the buffer
1473          * Default assumes that the current page title will be used.
1474          *
1475          * @param $text String
1476          * @param $linestart Boolean: is this the start of a line?
1477          * @param $interface Boolean: is this text in the user interface language?
1478          */
1479         public function addWikiText( $text, $linestart = true, $interface = true ) {
1480                 $title = $this->getTitle(); // Work around E_STRICT
1481                 if ( !$title ) {
1482                         throw new MWException( 'Title is null' );
1483                 }
1484                 $this->addWikiTextTitle( $text, $title, $linestart, /*tidy*/false, $interface );
1485         }
1486
1487         /**
1488          * Add wikitext with a custom Title object
1489          *
1490          * @param string $text wikitext
1491          * @param $title Title object
1492          * @param $linestart Boolean: is this the start of a line?
1493          */
1494         public function addWikiTextWithTitle( $text, &$title, $linestart = true ) {
1495                 $this->addWikiTextTitle( $text, $title, $linestart );
1496         }
1497
1498         /**
1499          * Add wikitext with a custom Title object and tidy enabled.
1500          *
1501          * @param string $text wikitext
1502          * @param $title Title object
1503          * @param $linestart Boolean: is this the start of a line?
1504          */
1505         function addWikiTextTitleTidy( $text, &$title, $linestart = true ) {
1506                 $this->addWikiTextTitle( $text, $title, $linestart, true );
1507         }
1508
1509         /**
1510          * Add wikitext with tidy enabled
1511          *
1512          * @param string $text wikitext
1513          * @param $linestart Boolean: is this the start of a line?
1514          */
1515         public function addWikiTextTidy( $text, $linestart = true ) {
1516                 $title = $this->getTitle();
1517                 $this->addWikiTextTitleTidy( $text, $title, $linestart );
1518         }
1519
1520         /**
1521          * Add wikitext with a custom Title object
1522          *
1523          * @param string $text wikitext
1524          * @param $title Title object
1525          * @param $linestart Boolean: is this the start of a line?
1526          * @param $tidy Boolean: whether to use tidy
1527          * @param $interface Boolean: whether it is an interface message
1528          *                                                              (for example disables conversion)
1529          */
1530         public function addWikiTextTitle( $text, Title $title, $linestart, $tidy = false, $interface = false ) {
1531                 global $wgParser;
1532
1533                 wfProfileIn( __METHOD__ );
1534
1535                 $popts = $this->parserOptions();
1536                 $oldTidy = $popts->setTidy( $tidy );
1537                 $popts->setInterfaceMessage( (bool) $interface );
1538
1539                 $parserOutput = $wgParser->parse(
1540                         $text, $title, $popts,
1541                         $linestart, true, $this->mRevisionId
1542                 );
1543
1544                 $popts->setTidy( $oldTidy );
1545
1546                 $this->addParserOutput( $parserOutput );
1547
1548                 wfProfileOut( __METHOD__ );
1549         }
1550
1551         /**
1552          * Add a ParserOutput object, but without Html
1553          *
1554          * @param $parserOutput ParserOutput object
1555          */
1556         public function addParserOutputNoText( &$parserOutput ) {
1557                 $this->mLanguageLinks += $parserOutput->getLanguageLinks();
1558                 $this->addCategoryLinks( $parserOutput->getCategories() );
1559                 $this->mNewSectionLink = $parserOutput->getNewSection();
1560                 $this->mHideNewSectionLink = $parserOutput->getHideNewSection();
1561
1562                 $this->mParseWarnings = $parserOutput->getWarnings();
1563                 if ( !$parserOutput->isCacheable() ) {
1564                         $this->enableClientCache( false );
1565                 }
1566                 $this->mNoGallery = $parserOutput->getNoGallery();
1567                 $this->mHeadItems = array_merge( $this->mHeadItems, $parserOutput->getHeadItems() );
1568                 $this->addModules( $parserOutput->getModules() );
1569                 $this->addModuleScripts( $parserOutput->getModuleScripts() );
1570                 $this->addModuleStyles( $parserOutput->getModuleStyles() );
1571                 $this->addModuleMessages( $parserOutput->getModuleMessages() );
1572
1573                 // Template versioning...
1574                 foreach ( (array)$parserOutput->getTemplateIds() as $ns => $dbks ) {
1575                         if ( isset( $this->mTemplateIds[$ns] ) ) {
1576                                 $this->mTemplateIds[$ns] = $dbks + $this->mTemplateIds[$ns];
1577                         } else {
1578                                 $this->mTemplateIds[$ns] = $dbks;
1579                         }
1580                 }
1581                 // File versioning...
1582                 foreach ( (array)$parserOutput->getFileSearchOptions() as $dbk => $data ) {
1583                         $this->mImageTimeKeys[$dbk] = $data;
1584                 }
1585
1586                 // Hooks registered in the object
1587                 global $wgParserOutputHooks;
1588                 foreach ( $parserOutput->getOutputHooks() as $hookInfo ) {
1589                         list( $hookName, $data ) = $hookInfo;
1590                         if ( isset( $wgParserOutputHooks[$hookName] ) ) {
1591                                 call_user_func( $wgParserOutputHooks[$hookName], $this, $parserOutput, $data );
1592                         }
1593                 }
1594
1595                 // Link flags are ignored for now, but may in the future be
1596                 // used to mark individual language links.
1597                 $linkFlags = array();
1598                 wfRunHooks( 'LanguageLinks', array( $this->getTitle(), &$this->mLanguageLinks, &$linkFlags ) );
1599                 wfRunHooks( 'OutputPageParserOutput', array( &$this, $parserOutput ) );
1600         }
1601
1602         /**
1603          * Add a ParserOutput object
1604          *
1605          * @param $parserOutput ParserOutput
1606          */
1607         function addParserOutput( &$parserOutput ) {
1608                 $this->addParserOutputNoText( $parserOutput );
1609                 $text = $parserOutput->getText();
1610                 wfRunHooks( 'OutputPageBeforeHTML', array( &$this, &$text ) );
1611                 $this->addHTML( $text );
1612         }
1613
1614         /**
1615          * Add the output of a QuickTemplate to the output buffer
1616          *
1617          * @param $template QuickTemplate
1618          */
1619         public function addTemplate( &$template ) {
1620                 ob_start();
1621                 $template->execute();
1622                 $this->addHTML( ob_get_contents() );
1623                 ob_end_clean();
1624         }
1625
1626         /**
1627          * Parse wikitext and return the HTML.
1628          *
1629          * @param $text String
1630          * @param $linestart Boolean: is this the start of a line?
1631          * @param $interface Boolean: use interface language ($wgLang instead of
1632          *                   $wgContLang) while parsing language sensitive magic
1633          *                   words like GRAMMAR and PLURAL. This also disables
1634          *                   LanguageConverter.
1635          * @param $language  Language object: target language object, will override
1636          *                   $interface
1637          * @throws MWException
1638          * @return String: HTML
1639          */
1640         public function parse( $text, $linestart = true, $interface = false, $language = null ) {
1641                 global $wgParser;
1642
1643                 if ( is_null( $this->getTitle() ) ) {
1644                         throw new MWException( 'Empty $mTitle in ' . __METHOD__ );
1645                 }
1646
1647                 $popts = $this->parserOptions();
1648                 if ( $interface ) {
1649                         $popts->setInterfaceMessage( true );
1650                 }
1651                 if ( $language !== null ) {
1652                         $oldLang = $popts->setTargetLanguage( $language );
1653                 }
1654
1655                 $parserOutput = $wgParser->parse(
1656                         $text, $this->getTitle(), $popts,
1657                         $linestart, true, $this->mRevisionId
1658                 );
1659
1660                 if ( $interface ) {
1661                         $popts->setInterfaceMessage( false );
1662                 }
1663                 if ( $language !== null ) {
1664                         $popts->setTargetLanguage( $oldLang );
1665                 }
1666
1667                 return $parserOutput->getText();
1668         }
1669
1670         /**
1671          * Parse wikitext, strip paragraphs, and return the HTML.
1672          *
1673          * @param $text String
1674          * @param $linestart Boolean: is this the start of a line?
1675          * @param $interface Boolean: use interface language ($wgLang instead of
1676          *                   $wgContLang) while parsing language sensitive magic
1677          *                   words like GRAMMAR and PLURAL
1678          * @return String: HTML
1679          */
1680         public function parseInline( $text, $linestart = true, $interface = false ) {
1681                 $parsed = $this->parse( $text, $linestart, $interface );
1682
1683                 $m = array();
1684                 if ( preg_match( '/^<p>(.*)\n?<\/p>\n?/sU', $parsed, $m ) ) {
1685                         $parsed = $m[1];
1686                 }
1687
1688                 return $parsed;
1689         }
1690
1691         /**
1692          * Set the value of the "s-maxage" part of the "Cache-control" HTTP header
1693          *
1694          * @param $maxage Integer: maximum cache time on the Squid, in seconds.
1695          */
1696         public function setSquidMaxage( $maxage ) {
1697                 $this->mSquidMaxage = $maxage;
1698         }
1699
1700         /**
1701          * Use enableClientCache(false) to force it to send nocache headers
1702          *
1703          * @param $state bool
1704          *
1705          * @return bool
1706          */
1707         public function enableClientCache( $state ) {
1708                 return wfSetVar( $this->mEnableClientCache, $state );
1709         }
1710
1711         /**
1712          * Get the list of cookies that will influence on the cache
1713          *
1714          * @return Array
1715          */
1716         function getCacheVaryCookies() {
1717                 global $wgCookiePrefix, $wgCacheVaryCookies;
1718                 static $cookies;
1719                 if ( $cookies === null ) {
1720                         $cookies = array_merge(
1721                                 array(
1722                                         "{$wgCookiePrefix}Token",
1723                                         "{$wgCookiePrefix}LoggedOut",
1724                                         session_name()
1725                                 ),
1726                                 $wgCacheVaryCookies
1727                         );
1728                         wfRunHooks( 'GetCacheVaryCookies', array( $this, &$cookies ) );
1729                 }
1730                 return $cookies;
1731         }
1732
1733         /**
1734          * Check if the request has a cache-varying cookie header
1735          * If it does, it's very important that we don't allow public caching
1736          *
1737          * @return Boolean
1738          */
1739         function haveCacheVaryCookies() {
1740                 $cookieHeader = $this->getRequest()->getHeader( 'cookie' );
1741                 if ( $cookieHeader === false ) {
1742                         return false;
1743                 }
1744                 $cvCookies = $this->getCacheVaryCookies();
1745                 foreach ( $cvCookies as $cookieName ) {
1746                         # Check for a simple string match, like the way squid does it
1747                         if ( strpos( $cookieHeader, $cookieName ) !== false ) {
1748                                 wfDebug( __METHOD__ . ": found $cookieName\n" );
1749                                 return true;
1750                         }
1751                 }
1752                 wfDebug( __METHOD__ . ": no cache-varying cookies found\n" );
1753                 return false;
1754         }
1755
1756         /**
1757          * Add an HTTP header that will influence on the cache
1758          *
1759          * @param string $header header name
1760          * @param $option Array|null
1761          * @todo FIXME: Document the $option parameter; it appears to be for
1762          *        X-Vary-Options but what format is acceptable?
1763          */
1764         public function addVaryHeader( $header, $option = null ) {
1765                 if ( !array_key_exists( $header, $this->mVaryHeader ) ) {
1766                         $this->mVaryHeader[$header] = (array)$option;
1767                 } elseif ( is_array( $option ) ) {
1768                         if ( is_array( $this->mVaryHeader[$header] ) ) {
1769                                 $this->mVaryHeader[$header] = array_merge( $this->mVaryHeader[$header], $option );
1770                         } else {
1771                                 $this->mVaryHeader[$header] = $option;
1772                         }
1773                 }
1774                 $this->mVaryHeader[$header] = array_unique( (array)$this->mVaryHeader[$header] );
1775         }
1776
1777         /**
1778          * Return a Vary: header on which to vary caches. Based on the keys of $mVaryHeader,
1779          * such as Accept-Encoding or Cookie
1780          *
1781          * @return String
1782          */
1783         public function getVaryHeader() {
1784                 return 'Vary: ' . join( ', ', array_keys( $this->mVaryHeader ) );
1785         }
1786
1787         /**
1788          * Get a complete X-Vary-Options header
1789          *
1790          * @return String
1791          */
1792         public function getXVO() {
1793                 $cvCookies = $this->getCacheVaryCookies();
1794
1795                 $cookiesOption = array();
1796                 foreach ( $cvCookies as $cookieName ) {
1797                         $cookiesOption[] = 'string-contains=' . $cookieName;
1798                 }
1799                 $this->addVaryHeader( 'Cookie', $cookiesOption );
1800
1801                 $headers = array();
1802                 foreach ( $this->mVaryHeader as $header => $option ) {
1803                         $newheader = $header;
1804                         if ( is_array( $option ) && count( $option ) > 0 ) {
1805                                 $newheader .= ';' . implode( ';', $option );
1806                         }
1807                         $headers[] = $newheader;
1808                 }
1809                 $xvo = 'X-Vary-Options: ' . implode( ',', $headers );
1810
1811                 return $xvo;
1812         }
1813
1814         /**
1815          * bug 21672: Add Accept-Language to Vary and XVO headers
1816          * if there's no 'variant' parameter existed in GET.
1817          *
1818          * For example:
1819          *   /w/index.php?title=Main_page should always be served; but
1820          *   /w/index.php?title=Main_page&variant=zh-cn should never be served.
1821          */
1822         function addAcceptLanguage() {
1823                 $lang = $this->getTitle()->getPageLanguage();
1824                 if ( !$this->getRequest()->getCheck( 'variant' ) && $lang->hasVariants() ) {
1825                         $variants = $lang->getVariants();
1826                         $aloption = array();
1827                         foreach ( $variants as $variant ) {
1828                                 if ( $variant === $lang->getCode() ) {
1829                                         continue;
1830                                 } else {
1831                                         $aloption[] = 'string-contains=' . $variant;
1832
1833                                         // IE and some other browsers use BCP 47 standards in
1834                                         // their Accept-Language header, like "zh-CN" or "zh-Hant".
1835                                         // We should handle these too.
1836                                         $variantBCP47 = wfBCP47( $variant );
1837                                         if ( $variantBCP47 !== $variant ) {
1838                                                 $aloption[] = 'string-contains=' . $variantBCP47;
1839                                         }
1840                                 }
1841                         }
1842                         $this->addVaryHeader( 'Accept-Language', $aloption );
1843                 }
1844         }
1845
1846         /**
1847          * Set a flag which will cause an X-Frame-Options header appropriate for
1848          * edit pages to be sent. The header value is controlled by
1849          * $wgEditPageFrameOptions.
1850          *
1851          * This is the default for special pages. If you display a CSRF-protected
1852          * form on an ordinary view page, then you need to call this function.
1853          *
1854          * @param $enable bool
1855          */
1856         public function preventClickjacking( $enable = true ) {
1857                 $this->mPreventClickjacking = $enable;
1858         }
1859
1860         /**
1861          * Turn off frame-breaking. Alias for $this->preventClickjacking(false).
1862          * This can be called from pages which do not contain any CSRF-protected
1863          * HTML form.
1864          */
1865         public function allowClickjacking() {
1866                 $this->mPreventClickjacking = false;
1867         }
1868
1869         /**
1870          * Get the X-Frame-Options header value (without the name part), or false
1871          * if there isn't one. This is used by Skin to determine whether to enable
1872          * JavaScript frame-breaking, for clients that don't support X-Frame-Options.
1873          *
1874          * @return string
1875          */
1876         public function getFrameOptions() {
1877                 global $wgBreakFrames, $wgEditPageFrameOptions;
1878                 if ( $wgBreakFrames ) {
1879                         return 'DENY';
1880                 } elseif ( $this->mPreventClickjacking && $wgEditPageFrameOptions ) {
1881                         return $wgEditPageFrameOptions;
1882                 }
1883                 return false;
1884         }
1885
1886         /**
1887          * Send cache control HTTP headers
1888          */
1889         public function sendCacheControl() {
1890                 global $wgUseSquid, $wgUseESI, $wgUseETag, $wgSquidMaxage, $wgUseXVO;
1891
1892                 $response = $this->getRequest()->response();
1893                 if ( $wgUseETag && $this->mETag ) {
1894                         $response->header( "ETag: $this->mETag" );
1895                 }
1896
1897                 $this->addVaryHeader( 'Cookie' );
1898                 $this->addAcceptLanguage();
1899
1900                 # don't serve compressed data to clients who can't handle it
1901                 # maintain different caches for logged-in users and non-logged in ones
1902                 $response->header( $this->getVaryHeader() );
1903
1904                 if ( $wgUseXVO ) {
1905                         # Add an X-Vary-Options header for Squid with Wikimedia patches
1906                         $response->header( $this->getXVO() );
1907                 }
1908
1909                 if ( $this->mEnableClientCache ) {
1910                         if (
1911                                 $wgUseSquid && session_id() == '' && !$this->isPrintable() &&
1912                                 $this->mSquidMaxage != 0 && !$this->haveCacheVaryCookies()
1913                         ) {
1914                                 if ( $wgUseESI ) {
1915                                         # We'll purge the proxy cache explicitly, but require end user agents
1916                                         # to revalidate against the proxy on each visit.
1917                                         # Surrogate-Control controls our Squid, Cache-Control downstream caches
1918                                         wfDebug( __METHOD__ . ": proxy caching with ESI; {$this->mLastModified} **\n", false );
1919                                         # start with a shorter timeout for initial testing
1920                                         # header( 'Surrogate-Control: max-age=2678400+2678400, content="ESI/1.0"');
1921                                         $response->header( 'Surrogate-Control: max-age=' . $wgSquidMaxage . '+' . $this->mSquidMaxage . ', content="ESI/1.0"' );
1922                                         $response->header( 'Cache-Control: s-maxage=0, must-revalidate, max-age=0' );
1923                                 } else {
1924                                         # We'll purge the proxy cache for anons explicitly, but require end user agents
1925                                         # to revalidate against the proxy on each visit.
1926                                         # IMPORTANT! The Squid needs to replace the Cache-Control header with
1927                                         # Cache-Control: s-maxage=0, must-revalidate, max-age=0
1928                                         wfDebug( __METHOD__ . ": local proxy caching; {$this->mLastModified} **\n", false );
1929                                         # start with a shorter timeout for initial testing
1930                                         # header( "Cache-Control: s-maxage=2678400, must-revalidate, max-age=0" );
1931                                         $response->header( 'Cache-Control: s-maxage=' . $this->mSquidMaxage . ', must-revalidate, max-age=0' );
1932                                 }
1933                         } else {
1934                                 # We do want clients to cache if they can, but they *must* check for updates
1935                                 # on revisiting the page.
1936                                 wfDebug( __METHOD__ . ": private caching; {$this->mLastModified} **\n", false );
1937                                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1938                                 $response->header( "Cache-Control: private, must-revalidate, max-age=0" );
1939                         }
1940                         if ( $this->mLastModified ) {
1941                                 $response->header( "Last-Modified: {$this->mLastModified}" );
1942                         }
1943                 } else {
1944                         wfDebug( __METHOD__ . ": no caching **\n", false );
1945
1946                         # In general, the absence of a last modified header should be enough to prevent
1947                         # the client from using its cache. We send a few other things just to make sure.
1948                         $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1949                         $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
1950                         $response->header( 'Pragma: no-cache' );
1951                 }
1952         }
1953
1954         /**
1955          * Get the message associated with the HTTP response code $code
1956          *
1957          * @param $code Integer: status code
1958          * @return String or null: message or null if $code is not in the list of
1959          *         messages
1960          *
1961          * @deprecated since 1.18 Use HttpStatus::getMessage() instead.
1962          */
1963         public static function getStatusMessage( $code ) {
1964                 wfDeprecated( __METHOD__, '1.18' );
1965                 return HttpStatus::getMessage( $code );
1966         }
1967
1968         /**
1969          * Finally, all the text has been munged and accumulated into
1970          * the object, let's actually output it:
1971          */
1972         public function output() {
1973                 global $wgLanguageCode, $wgDebugRedirects, $wgMimeType, $wgVaryOnXFP,
1974                         $wgUseAjax, $wgResponsiveImages;
1975
1976                 if ( $this->mDoNothing ) {
1977                         return;
1978                 }
1979
1980                 wfProfileIn( __METHOD__ );
1981
1982                 $response = $this->getRequest()->response();
1983
1984                 if ( $this->mRedirect != '' ) {
1985                         # Standards require redirect URLs to be absolute
1986                         $this->mRedirect = wfExpandUrl( $this->mRedirect, PROTO_CURRENT );
1987
1988                         $redirect = $this->mRedirect;
1989                         $code = $this->mRedirectCode;
1990
1991                         if ( wfRunHooks( "BeforePageRedirect", array( $this, &$redirect, &$code ) ) ) {
1992                                 if ( $code == '301' || $code == '303' ) {
1993                                         if ( !$wgDebugRedirects ) {
1994                                                 $message = HttpStatus::getMessage( $code );
1995                                                 $response->header( "HTTP/1.1 $code $message" );
1996                                         }
1997                                         $this->mLastModified = wfTimestamp( TS_RFC2822 );
1998                                 }
1999                                 if ( $wgVaryOnXFP ) {
2000                                         $this->addVaryHeader( 'X-Forwarded-Proto' );
2001                                 }
2002                                 $this->sendCacheControl();
2003
2004                                 $response->header( "Content-Type: text/html; charset=utf-8" );
2005                                 if ( $wgDebugRedirects ) {
2006                                         $url = htmlspecialchars( $redirect );
2007                                         print "<html>\n<head>\n<title>Redirect</title>\n</head>\n<body>\n";
2008                                         print "<p>Location: <a href=\"$url\">$url</a></p>\n";
2009                                         print "</body>\n</html>\n";
2010                                 } else {
2011                                         $response->header( 'Location: ' . $redirect );
2012                                 }
2013                         }
2014
2015                         wfProfileOut( __METHOD__ );
2016                         return;
2017                 } elseif ( $this->mStatusCode ) {
2018                         $message = HttpStatus::getMessage( $this->mStatusCode );
2019                         if ( $message ) {
2020                                 $response->header( 'HTTP/1.1 ' . $this->mStatusCode . ' ' . $message );
2021                         }
2022                 }
2023
2024                 # Buffer output; final headers may depend on later processing
2025                 ob_start();
2026
2027                 $response->header( "Content-type: $wgMimeType; charset=UTF-8" );
2028                 $response->header( 'Content-language: ' . $wgLanguageCode );
2029
2030                 // Prevent framing, if requested
2031                 $frameOptions = $this->getFrameOptions();
2032                 if ( $frameOptions ) {
2033                         $response->header( "X-Frame-Options: $frameOptions" );
2034                 }
2035
2036                 if ( $this->mArticleBodyOnly ) {
2037                         echo $this->mBodytext;
2038                 } else {
2039
2040                         $sk = $this->getSkin();
2041                         // add skin specific modules
2042                         $modules = $sk->getDefaultModules();
2043
2044                         // enforce various default modules for all skins
2045                         $coreModules = array(
2046                                 // keep this list as small as possible
2047                                 'mediawiki.page.startup',
2048                                 'mediawiki.user',
2049                         );
2050
2051                         // Support for high-density display images if enabled
2052                         if ( $wgResponsiveImages ) {
2053                                 $coreModules[] = 'mediawiki.hidpi';
2054                         }
2055
2056                         $this->addModules( $coreModules );
2057                         foreach ( $modules as $group ) {
2058                                 $this->addModules( $group );
2059                         }
2060                         MWDebug::addModules( $this );
2061                         if ( $wgUseAjax ) {
2062                                 // FIXME: deprecate? - not clear why this is useful
2063                                 wfRunHooks( 'AjaxAddScript', array( &$this ) );
2064                         }
2065
2066                         // Hook that allows last minute changes to the output page, e.g.
2067                         // adding of CSS or Javascript by extensions.
2068                         wfRunHooks( 'BeforePageDisplay', array( &$this, &$sk ) );
2069
2070                         wfProfileIn( 'Output-skin' );
2071                         $sk->outputPage();
2072                         wfProfileOut( 'Output-skin' );
2073                 }
2074
2075                 // This hook allows last minute changes to final overall output by modifying output buffer
2076                 wfRunHooks( 'AfterFinalPageOutput', array( $this ) );
2077
2078                 $this->sendCacheControl();
2079
2080                 ob_end_flush();
2081
2082                 wfProfileOut( __METHOD__ );
2083         }
2084
2085         /**
2086          * Actually output something with print.
2087          *
2088          * @param string $ins the string to output
2089          * @deprecated since 1.22 Use echo yourself.
2090          */
2091         public function out( $ins ) {
2092                 wfDeprecated( __METHOD__, '1.22' );
2093                 print $ins;
2094         }
2095
2096         /**
2097          * Produce a "user is blocked" page.
2098          * @deprecated since 1.18
2099          */
2100         function blockedPage() {
2101                 throw new UserBlockedError( $this->getUser()->mBlock );
2102         }
2103
2104         /**
2105          * Prepare this object to display an error page; disable caching and
2106          * indexing, clear the current text and redirect, set the page's title
2107          * and optionally an custom HTML title (content of the "<title>" tag).
2108          *
2109          * @param string|Message $pageTitle will be passed directly to setPageTitle()
2110          * @param string|Message $htmlTitle will be passed directly to setHTMLTitle();
2111          *                   optional, if not passed the "<title>" attribute will be
2112          *                   based on $pageTitle
2113          */
2114         public function prepareErrorPage( $pageTitle, $htmlTitle = false ) {
2115                 $this->setPageTitle( $pageTitle );
2116                 if ( $htmlTitle !== false ) {
2117                         $this->setHTMLTitle( $htmlTitle );
2118                 }
2119                 $this->setRobotPolicy( 'noindex,nofollow' );
2120                 $this->setArticleRelated( false );
2121                 $this->enableClientCache( false );
2122                 $this->mRedirect = '';
2123                 $this->clearSubtitle();
2124                 $this->clearHTML();
2125         }
2126
2127         /**
2128          * Output a standard error page
2129          *
2130          * showErrorPage( 'titlemsg', 'pagetextmsg', array( 'param1', 'param2' ) );
2131          * showErrorPage( 'titlemsg', $messageObject );
2132          * showErrorPage( $titleMessageObj, $messageObject );
2133          *
2134          * @param $title Mixed: message key (string) for page title, or a Message object
2135          * @param $msg Mixed: message key (string) for page text, or a Message object
2136          * @param array $params message parameters; ignored if $msg is a Message object
2137          */
2138         public function showErrorPage( $title, $msg, $params = array() ) {
2139                 if ( !$title instanceof Message ) {
2140                         $title = $this->msg( $title );
2141                 }
2142
2143                 $this->prepareErrorPage( $title );
2144
2145                 if ( $msg instanceof Message ) {
2146                         $this->addHTML( $msg->parseAsBlock() );
2147                 } else {
2148                         $this->addWikiMsgArray( $msg, $params );
2149                 }
2150
2151                 $this->returnToMain();
2152         }
2153
2154         /**
2155          * Output a standard permission error page
2156          *
2157          * @param array $errors error message keys
2158          * @param string $action action that was denied or null if unknown
2159          */
2160         public function showPermissionsErrorPage( $errors, $action = null ) {
2161                 // For some action (read, edit, create and upload), display a "login to do this action"
2162                 // error if all of the following conditions are met:
2163                 // 1. the user is not logged in
2164                 // 2. the only error is insufficient permissions (i.e. no block or something else)
2165                 // 3. the error can be avoided simply by logging in
2166                 if ( in_array( $action, array( 'read', 'edit', 'createpage', 'createtalk', 'upload' ) )
2167                         && $this->getUser()->isAnon() && count( $errors ) == 1 && isset( $errors[0][0] )
2168                         && ( $errors[0][0] == 'badaccess-groups' || $errors[0][0] == 'badaccess-group0' )
2169                         && ( User::groupHasPermission( 'user', $action )
2170                         || User::groupHasPermission( 'autoconfirmed', $action ) )
2171                 ) {
2172                         $displayReturnto = null;
2173
2174                         # Due to bug 32276, if a user does not have read permissions,
2175                         # $this->getTitle() will just give Special:Badtitle, which is
2176                         # not especially useful as a returnto parameter. Use the title
2177                         # from the request instead, if there was one.
2178                         $request = $this->getRequest();
2179                         $returnto = Title::newFromURL( $request->getVal( 'title', '' ) );
2180                         if ( $action == 'edit' ) {
2181                                 $msg = 'whitelistedittext';
2182                                 $displayReturnto = $returnto;
2183                         } elseif ( $action == 'createpage' || $action == 'createtalk' ) {
2184                                 $msg = 'nocreatetext';
2185                         } elseif ( $action == 'upload' ) {
2186                                 $msg = 'uploadnologintext';
2187                         } else { # Read
2188                                 $msg = 'loginreqpagetext';
2189                                 $displayReturnto = Title::newMainPage();
2190                         }
2191
2192                         $query = array();
2193
2194                         if ( $returnto ) {
2195                                 $query['returnto'] = $returnto->getPrefixedText();
2196
2197                                 if ( !$request->wasPosted() ) {
2198                                         $returntoquery = $request->getValues();
2199                                         unset( $returntoquery['title'] );
2200                                         unset( $returntoquery['returnto'] );
2201                                         unset( $returntoquery['returntoquery'] );
2202                                         $query['returntoquery'] = wfArrayToCgi( $returntoquery );
2203                                 }
2204                         }
2205                         $loginLink = Linker::linkKnown(
2206                                 SpecialPage::getTitleFor( 'Userlogin' ),
2207                                 $this->msg( 'loginreqlink' )->escaped(),
2208                                 array(),
2209                                 $query
2210                         );
2211
2212                         $this->prepareErrorPage( $this->msg( 'loginreqtitle' ) );
2213                         $this->addHTML( $this->msg( $msg )->rawParams( $loginLink )->parse() );
2214
2215                         # Don't return to a page the user can't read otherwise
2216                         # we'll end up in a pointless loop
2217                         if ( $displayReturnto && $displayReturnto->userCan( 'read', $this->getUser() ) ) {
2218                                 $this->returnToMain( null, $displayReturnto );
2219                         }
2220                 } else {
2221                         $this->prepareErrorPage( $this->msg( 'permissionserrors' ) );
2222                         $this->addWikiText( $this->formatPermissionsErrorMessage( $errors, $action ) );
2223                 }
2224         }
2225
2226         /**
2227          * Display an error page indicating that a given version of MediaWiki is
2228          * required to use it
2229          *
2230          * @param $version Mixed: the version of MediaWiki needed to use the page
2231          */
2232         public function versionRequired( $version ) {
2233                 $this->prepareErrorPage( $this->msg( 'versionrequired', $version ) );
2234
2235                 $this->addWikiMsg( 'versionrequiredtext', $version );
2236                 $this->returnToMain();
2237         }
2238
2239         /**
2240          * Display an error page noting that a given permission bit is required.
2241          * @deprecated since 1.18, just throw the exception directly
2242          * @param string $permission key required
2243          * @throws PermissionsError
2244          */
2245         public function permissionRequired( $permission ) {
2246                 throw new PermissionsError( $permission );
2247         }
2248
2249         /**
2250          * Produce the stock "please login to use the wiki" page
2251          *
2252          * @deprecated in 1.19; throw the exception directly
2253          */
2254         public function loginToUse() {
2255                 throw new PermissionsError( 'read' );
2256         }
2257
2258         /**
2259          * Format a list of error messages
2260          *
2261          * @param array $errors of arrays returned by Title::getUserPermissionsErrors
2262          * @param string $action action that was denied or null if unknown
2263          * @return String: the wikitext error-messages, formatted into a list.
2264          */
2265         public function formatPermissionsErrorMessage( $errors, $action = null ) {
2266                 if ( $action == null ) {
2267                         $text = $this->msg( 'permissionserrorstext', count( $errors ) )->plain() . "\n\n";
2268                 } else {
2269                         $action_desc = $this->msg( "action-$action" )->plain();
2270                         $text = $this->msg(
2271                                 'permissionserrorstext-withaction',
2272                                 count( $errors ),
2273                                 $action_desc
2274                         )->plain() . "\n\n";
2275                 }
2276
2277                 if ( count( $errors ) > 1 ) {
2278                         $text .= '<ul class="permissions-errors">' . "\n";
2279
2280                         foreach ( $errors as $error ) {
2281                                 $text .= '<li>';
2282                                 $text .= call_user_func_array( array( $this, 'msg' ), $error )->plain();
2283                                 $text .= "</li>\n";
2284                         }
2285                         $text .= '</ul>';
2286                 } else {
2287                         $text .= "<div class=\"permissions-errors\">\n" .
2288                                         call_user_func_array( array( $this, 'msg' ), reset( $errors ) )->plain() .
2289                                         "\n</div>";
2290                 }
2291
2292                 return $text;
2293         }
2294
2295         /**
2296          * Display a page stating that the Wiki is in read-only mode,
2297          * and optionally show the source of the page that the user
2298          * was trying to edit.  Should only be called (for this
2299          * purpose) after wfReadOnly() has returned true.
2300          *
2301          * For historical reasons, this function is _also_ used to
2302          * show the error message when a user tries to edit a page
2303          * they are not allowed to edit.  (Unless it's because they're
2304          * blocked, then we show blockedPage() instead.)  In this
2305          * case, the second parameter should be set to true and a list
2306          * of reasons supplied as the third parameter.
2307          *
2308          * @todo Needs to be split into multiple functions.
2309          *
2310          * @param $source    String: source code to show (or null).
2311          * @param $protected Boolean: is this a permissions error?
2312          * @param $reasons   Array: list of reasons for this error, as returned by Title::getUserPermissionsErrors().
2313          * @param $action    String: action that was denied or null if unknown
2314          * @throws ReadOnlyError
2315          */
2316         public function readOnlyPage( $source = null, $protected = false, $reasons = array(), $action = null ) {
2317                 $this->setRobotPolicy( 'noindex,nofollow' );
2318                 $this->setArticleRelated( false );
2319
2320                 // If no reason is given, just supply a default "I can't let you do
2321                 // that, Dave" message.  Should only occur if called by legacy code.
2322                 if ( $protected && empty( $reasons ) ) {
2323                         $reasons[] = array( 'badaccess-group0' );
2324                 }
2325
2326                 if ( !empty( $reasons ) ) {
2327                         // Permissions error
2328                         if ( $source ) {
2329                                 $this->setPageTitle( $this->msg( 'viewsource-title', $this->getTitle()->getPrefixedText() ) );
2330                                 $this->addBacklinkSubtitle( $this->getTitle() );
2331                         } else {
2332                                 $this->setPageTitle( $this->msg( 'badaccess' ) );
2333                         }
2334                         $this->addWikiText( $this->formatPermissionsErrorMessage( $reasons, $action ) );
2335                 } else {
2336                         // Wiki is read only
2337                         throw new ReadOnlyError;
2338                 }
2339
2340                 // Show source, if supplied
2341                 if ( is_string( $source ) ) {
2342                         $this->addWikiMsg( 'viewsourcetext' );
2343
2344                         $pageLang = $this->getTitle()->getPageLanguage();
2345                         $params = array(
2346                                 'id' => 'wpTextbox1',
2347                                 'name' => 'wpTextbox1',
2348                                 'cols' => $this->getUser()->getOption( 'cols' ),
2349                                 'rows' => $this->getUser()->getOption( 'rows' ),
2350                                 'readonly' => 'readonly',
2351                                 'lang' => $pageLang->getHtmlCode(),
2352                                 'dir' => $pageLang->getDir(),
2353                         );
2354                         $this->addHTML( Html::element( 'textarea', $params, $source ) );
2355
2356                         // Show templates used by this article
2357                         $templates = Linker::formatTemplates( $this->getTitle()->getTemplateLinksFrom() );
2358                         $this->addHTML( "<div class='templatesUsed'>
2359 $templates
2360 </div>
2361 " );
2362                 }
2363
2364                 # If the title doesn't exist, it's fairly pointless to print a return
2365                 # link to it.  After all, you just tried editing it and couldn't, so
2366                 # what's there to do there?
2367                 if ( $this->getTitle()->exists() ) {
2368                         $this->returnToMain( null, $this->getTitle() );
2369                 }
2370         }
2371
2372         /**
2373          * Turn off regular page output and return an error response
2374          * for when rate limiting has triggered.
2375          */
2376         public function rateLimited() {
2377                 throw new ThrottledError;
2378         }
2379
2380         /**
2381          * Show a warning about slave lag
2382          *
2383          * If the lag is higher than $wgSlaveLagCritical seconds,
2384          * then the warning is a bit more obvious. If the lag is
2385          * lower than $wgSlaveLagWarning, then no warning is shown.
2386          *
2387          * @param $lag Integer: slave lag
2388          */
2389         public function showLagWarning( $lag ) {
2390                 global $wgSlaveLagWarning, $wgSlaveLagCritical;
2391                 if ( $lag >= $wgSlaveLagWarning ) {
2392                         $message = $lag < $wgSlaveLagCritical
2393                                 ? 'lag-warn-normal'
2394                                 : 'lag-warn-high';
2395                         $wrap = Html::rawElement( 'div', array( 'class' => "mw-{$message}" ), "\n$1\n" );
2396                         $this->wrapWikiMsg( "$wrap\n", array( $message, $this->getLanguage()->formatNum( $lag ) ) );
2397                 }
2398         }
2399
2400         public function showFatalError( $message ) {
2401                 $this->prepareErrorPage( $this->msg( 'internalerror' ) );
2402
2403                 $this->addHTML( $message );
2404         }
2405
2406         public function showUnexpectedValueError( $name, $val ) {
2407                 $this->showFatalError( $this->msg( 'unexpected', $name, $val )->text() );
2408         }
2409
2410         public function showFileCopyError( $old, $new ) {
2411                 $this->showFatalError( $this->msg( 'filecopyerror', $old, $new )->text() );
2412         }
2413
2414         public function showFileRenameError( $old, $new ) {
2415                 $this->showFatalError( $this->msg( 'filerenameerror', $old, $new )->text() );
2416         }
2417
2418         public function showFileDeleteError( $name ) {
2419                 $this->showFatalError( $this->msg( 'filedeleteerror', $name )->text() );
2420         }
2421
2422         public function showFileNotFoundError( $name ) {
2423                 $this->showFatalError( $this->msg( 'filenotfound', $name )->text() );
2424         }
2425
2426         /**
2427          * Add a "return to" link pointing to a specified title
2428          *
2429          * @param $title Title to link
2430          * @param array $query query string parameters
2431          * @param string $text text of the link (input is not escaped)
2432          * @param $options Options array to pass to Linker
2433          */
2434         public function addReturnTo( $title, $query = array(), $text = null, $options = array() ) {
2435                 if ( in_array( 'http', $options ) ) {
2436                         $proto = PROTO_HTTP;
2437                 } elseif ( in_array( 'https', $options ) ) {
2438                         $proto = PROTO_HTTPS;
2439                 } else {
2440                         $proto = PROTO_RELATIVE;
2441                 }
2442
2443                 $link = $this->msg( 'returnto' )->rawParams(
2444                         Linker::link( $title, $text, array(), $query, $options ) )->escaped();
2445                 $this->addHTML( "<p id=\"mw-returnto\">{$link}</p>\n" );
2446         }
2447
2448         /**
2449          * Add a "return to" link pointing to a specified title,
2450          * or the title indicated in the request, or else the main page
2451          *
2452          * @param $unused
2453          * @param $returnto Title or String to return to
2454          * @param string $returntoquery query string for the return to link
2455          */
2456         public function returnToMain( $unused = null, $returnto = null, $returntoquery = null ) {
2457                 if ( $returnto == null ) {
2458                         $returnto = $this->getRequest()->getText( 'returnto' );
2459                 }
2460
2461                 if ( $returntoquery == null ) {
2462                         $returntoquery = $this->getRequest()->getText( 'returntoquery' );
2463                 }
2464
2465                 if ( $returnto === '' ) {
2466                         $returnto = Title::newMainPage();
2467                 }
2468
2469                 if ( is_object( $returnto ) ) {
2470                         $titleObj = $returnto;
2471                 } else {
2472                         $titleObj = Title::newFromText( $returnto );
2473                 }
2474                 if ( !is_object( $titleObj ) ) {
2475                         $titleObj = Title::newMainPage();
2476                 }
2477
2478                 $this->addReturnTo( $titleObj, wfCgiToArray( $returntoquery ) );
2479         }
2480
2481         /**
2482          * @param $sk Skin The given Skin
2483          * @param $includeStyle Boolean: unused
2484          * @return String: The doctype, opening "<html>", and head element.
2485          */
2486         public function headElement( Skin $sk, $includeStyle = true ) {
2487                 global $wgContLang, $wgMimeType;
2488
2489                 $userdir = $this->getLanguage()->getDir();
2490                 $sitedir = $wgContLang->getDir();
2491
2492                 if ( $sk->commonPrintStylesheet() ) {
2493                         $this->addModuleStyles( 'mediawiki.legacy.wikiprintable' );
2494                 }
2495
2496                 $ret = Html::htmlHeader( array( 'lang' => $this->getLanguage()->getHtmlCode(), 'dir' => $userdir, 'class' => 'client-nojs' ) );
2497
2498                 if ( $this->getHTMLTitle() == '' ) {
2499                         $this->setHTMLTitle( $this->msg( 'pagetitle', $this->getPageTitle() ) );
2500                 }
2501
2502                 $openHead = Html::openElement( 'head' );
2503                 if ( $openHead ) {
2504                         # Don't bother with the newline if $head == ''
2505                         $ret .= "$openHead\n";
2506                 }
2507
2508                 if ( !Html::isXmlMimeType( $wgMimeType ) ) {
2509                         // Add <meta charset="UTF-8">
2510                         // This should be before <title> since it defines the charset used by
2511                         // text including the text inside <title>.
2512                         // The spec recommends defining XHTML5's charset using the XML declaration
2513                         // instead of meta.
2514                         // Our XML declaration is output by Html::htmlHeader.
2515                         // http://www.whatwg.org/html/semantics.html#attr-meta-http-equiv-content-type
2516                         // http://www.whatwg.org/html/semantics.html#charset
2517                         $ret .= Html::element( 'meta', array( 'charset' => 'UTF-8' ) );
2518                 }
2519
2520                 $ret .= Html::element( 'title', null, $this->getHTMLTitle() ) . "\n";
2521
2522                 $ret .= implode( "\n", array(
2523                         $this->getHeadLinks(),
2524                         $this->buildCssLinks(),
2525                         $this->getHeadScripts(),
2526                         $this->getHeadItems()
2527                 ) );
2528
2529                 $closeHead = Html::closeElement( 'head' );
2530                 if ( $closeHead ) {
2531                         $ret .= "$closeHead\n";
2532                 }
2533
2534                 $bodyClasses = array();
2535                 $bodyClasses[] = 'mediawiki';
2536
2537                 # Classes for LTR/RTL directionality support
2538                 $bodyClasses[] = $userdir;
2539                 $bodyClasses[] = "sitedir-$sitedir";
2540
2541                 if ( $this->getLanguage()->capitalizeAllNouns() ) {
2542                         # A <body> class is probably not the best way to do this . . .
2543                         $bodyClasses[] = 'capitalize-all-nouns';
2544                 }
2545
2546                 $bodyClasses[] = $sk->getPageClasses( $this->getTitle() );
2547                 $bodyClasses[] = 'skin-' . Sanitizer::escapeClass( $sk->getSkinName() );
2548                 $bodyClasses[] = 'action-' . Sanitizer::escapeClass( Action::getActionName( $this->getContext() ) );
2549
2550                 $bodyAttrs = array();
2551                 // While the implode() is not strictly needed, it's used for backwards compatibility
2552                 // (this used to be built as a string and hooks likely still expect that).
2553                 $bodyAttrs['class'] = implode( ' ', $bodyClasses );
2554
2555                 // Allow skins and extensions to add body attributes they need
2556                 $sk->addToBodyAttributes( $this, $bodyAttrs );
2557                 wfRunHooks( 'OutputPageBodyAttributes', array( $this, $sk, &$bodyAttrs ) );
2558
2559                 $ret .= Html::openElement( 'body', $bodyAttrs ) . "\n";
2560
2561                 return $ret;
2562         }
2563
2564         /**
2565          * Get a ResourceLoader object associated with this OutputPage
2566          *
2567          * @return ResourceLoader
2568          */
2569         public function getResourceLoader() {
2570                 if ( is_null( $this->mResourceLoader ) ) {
2571                         $this->mResourceLoader = new ResourceLoader();
2572                 }
2573                 return $this->mResourceLoader;
2574         }
2575
2576         /**
2577          * TODO: Document
2578          * @param $modules Array/string with the module name(s)
2579          * @param string $only ResourceLoaderModule TYPE_ class constant
2580          * @param $useESI boolean
2581          * @param array $extraQuery with extra query parameters to add to each request. array( param => value )
2582          * @param $loadCall boolean If true, output an (asynchronous) mw.loader.load() call rather than a "<script src='...'>" tag
2583          * @return string html "<script>" and "<style>" tags
2584          */
2585         protected function makeResourceLoaderLink( $modules, $only, $useESI = false, array $extraQuery = array(), $loadCall = false ) {
2586                 global $wgResourceLoaderUseESI;
2587
2588                 $modules = (array) $modules;
2589
2590                 if ( !count( $modules ) ) {
2591                         return '';
2592                 }
2593
2594                 if ( count( $modules ) > 1 ) {
2595                         // Remove duplicate module requests
2596                         $modules = array_unique( $modules );
2597                         // Sort module names so requests are more uniform
2598                         sort( $modules );
2599
2600                         if ( ResourceLoader::inDebugMode() ) {
2601                                 // Recursively call us for every item
2602                                 $links = '';
2603                                 foreach ( $modules as $name ) {
2604                                         $links .= $this->makeResourceLoaderLink( $name, $only, $useESI );
2605                                 }
2606                                 return $links;
2607                         }
2608                 }
2609                 if ( !is_null( $this->mTarget ) ) {
2610                         $extraQuery['target'] = $this->mTarget;
2611                 }
2612
2613                 // Create keyed-by-group list of module objects from modules list
2614                 $groups = array();
2615                 $resourceLoader = $this->getResourceLoader();
2616                 foreach ( $modules as $name ) {
2617                         $module = $resourceLoader->getModule( $name );
2618                         # Check that we're allowed to include this module on this page
2619                         if ( !$module
2620                                 || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_SCRIPTS )
2621                                         && $only == ResourceLoaderModule::TYPE_SCRIPTS )
2622                                 || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_STYLES )
2623                                         && $only == ResourceLoaderModule::TYPE_STYLES )
2624                                 || ( $this->mTarget && !in_array( $this->mTarget, $module->getTargets() ) )
2625                         ) {
2626                                 continue;
2627                         }
2628
2629                         $group = $module->getGroup();
2630                         if ( !isset( $groups[$group] ) ) {
2631                                 $groups[$group] = array();
2632                         }
2633                         $groups[$group][$name] = $module;
2634                 }
2635
2636                 $links = '';
2637                 foreach ( $groups as $group => $grpModules ) {
2638                         // Special handling for user-specific groups
2639                         $user = null;
2640                         if ( ( $group === 'user' || $group === 'private' ) && $this->getUser()->isLoggedIn() ) {
2641                                 $user = $this->getUser()->getName();
2642                         }
2643
2644                         // Create a fake request based on the one we are about to make so modules return
2645                         // correct timestamp and emptiness data
2646                         $query = ResourceLoader::makeLoaderQuery(
2647                                 array(), // modules; not determined yet
2648                                 $this->getLanguage()->getCode(),
2649                                 $this->getSkin()->getSkinName(),
2650                                 $user,
2651                                 null, // version; not determined yet
2652                                 ResourceLoader::inDebugMode(),
2653                                 $only === ResourceLoaderModule::TYPE_COMBINED ? null : $only,
2654                                 $this->isPrintable(),
2655                                 $this->getRequest()->getBool( 'handheld' ),
2656                                 $extraQuery
2657                         );
2658                         $context = new ResourceLoaderContext( $resourceLoader, new FauxRequest( $query ) );
2659                         // Extract modules that know they're empty
2660                         $emptyModules = array();
2661                         foreach ( $grpModules as $key => $module ) {
2662                                 if ( $module->isKnownEmpty( $context ) ) {
2663                                         $emptyModules[$key] = 'ready';
2664                                         unset( $grpModules[$key] );
2665                                 }
2666                         }
2667                         // Inline empty modules: since they're empty, just mark them as 'ready'
2668                         if ( count( $emptyModules ) > 0 && $only !== ResourceLoaderModule::TYPE_STYLES ) {
2669                                 // If we're only getting the styles, we don't need to do anything for empty modules.
2670                                 $links .= Html::inlineScript(
2671                                                 ResourceLoader::makeLoaderConditionalScript(
2672                                                                 ResourceLoader::makeLoaderStateScript( $emptyModules )
2673                                                 )
2674                                 ) . "\n";
2675                         }
2676
2677                         // If there are no modules left, skip this group
2678                         if ( count( $grpModules ) === 0 ) {
2679                                 continue;
2680                         }
2681
2682                         // Inline private modules. These can't be loaded through load.php for security
2683                         // reasons, see bug 34907. Note that these modules should be loaded from
2684                         // getHeadScripts() before the first loader call. Otherwise other modules can't
2685                         // properly use them as dependencies (bug 30914)
2686                         if ( $group === 'private' ) {
2687                                 if ( $only == ResourceLoaderModule::TYPE_STYLES ) {
2688                                         $links .= Html::inlineStyle(
2689                                                 $resourceLoader->makeModuleResponse( $context, $grpModules )
2690                                         );
2691                                 } else {
2692                                         $links .= Html::inlineScript(
2693                                                 ResourceLoader::makeLoaderConditionalScript(
2694                                                         $resourceLoader->makeModuleResponse( $context, $grpModules )
2695                                                 )
2696                                         );
2697                                 }
2698                                 $links .= "\n";
2699                                 continue;
2700                         }
2701                         // Special handling for the user group; because users might change their stuff
2702                         // on-wiki like user pages, or user preferences; we need to find the highest
2703                         // timestamp of these user-changeable modules so we can ensure cache misses on change
2704                         // This should NOT be done for the site group (bug 27564) because anons get that too
2705                         // and we shouldn't be putting timestamps in Squid-cached HTML
2706                         $version = null;
2707                         if ( $group === 'user' ) {
2708                                 // Get the maximum timestamp
2709                                 $timestamp = 1;
2710                                 foreach ( $grpModules as $module ) {
2711                                         $timestamp = max( $timestamp, $module->getModifiedTime( $context ) );
2712                                 }
2713                                 // Add a version parameter so cache will break when things change
2714                                 $version = wfTimestamp( TS_ISO_8601_BASIC, $timestamp );
2715                         }
2716
2717                         $url = ResourceLoader::makeLoaderURL(
2718                                 array_keys( $grpModules ),
2719                                 $this->getLanguage()->getCode(),
2720                                 $this->getSkin()->getSkinName(),
2721                                 $user,
2722                                 $version,
2723                                 ResourceLoader::inDebugMode(),
2724                                 $only === ResourceLoaderModule::TYPE_COMBINED ? null : $only,
2725                                 $this->isPrintable(),
2726                                 $this->getRequest()->getBool( 'handheld' ),
2727                                 $extraQuery
2728                         );
2729                         if ( $useESI && $wgResourceLoaderUseESI ) {
2730                                 $esi = Xml::element( 'esi:include', array( 'src' => $url ) );
2731                                 if ( $only == ResourceLoaderModule::TYPE_STYLES ) {
2732                                         $link = Html::inlineStyle( $esi );
2733                                 } else {
2734                                         $link = Html::inlineScript( $esi );
2735                                 }
2736                         } else {
2737                                 // Automatically select style/script elements
2738                                 if ( $only === ResourceLoaderModule::TYPE_STYLES ) {
2739                                         $link = Html::linkedStyle( $url );
2740                                 } elseif ( $loadCall ) {
2741                                         $link = Html::inlineScript(
2742                                                 ResourceLoader::makeLoaderConditionalScript(
2743                                                         Xml::encodeJsCall( 'mw.loader.load', array( $url, 'text/javascript', true ) )
2744                                                 )
2745                                         );
2746                                 } else {
2747                                         $link = Html::linkedScript( $url );
2748                                 }
2749                         }
2750
2751                         if ( $group == 'noscript' ) {
2752                                 $links .= Html::rawElement( 'noscript', array(), $link ) . "\n";
2753                         } else {
2754                                 $links .= $link . "\n";
2755                         }
2756                 }
2757                 return $links;
2758         }
2759
2760         /**
2761          * JS stuff to put in the "<head>". This is the startup module, config
2762          * vars and modules marked with position 'top'
2763          *
2764          * @return String: HTML fragment
2765          */
2766         function getHeadScripts() {
2767                 global $wgResourceLoaderExperimentalAsyncLoading;
2768
2769                 // Startup - this will immediately load jquery and mediawiki modules
2770                 $scripts = $this->makeResourceLoaderLink( 'startup', ResourceLoaderModule::TYPE_SCRIPTS, true );
2771
2772                 // Load config before anything else
2773                 $scripts .= Html::inlineScript(
2774                         ResourceLoader::makeLoaderConditionalScript(
2775                                 ResourceLoader::makeConfigSetScript( $this->getJSVars() )
2776                         )
2777                 );
2778
2779                 // Load embeddable private modules before any loader links
2780                 // This needs to be TYPE_COMBINED so these modules are properly wrapped
2781                 // in mw.loader.implement() calls and deferred until mw.user is available
2782                 $embedScripts = array( 'user.options', 'user.tokens' );
2783                 $scripts .= $this->makeResourceLoaderLink( $embedScripts, ResourceLoaderModule::TYPE_COMBINED );
2784
2785                 // Script and Messages "only" requests marked for top inclusion
2786                 // Messages should go first
2787                 $scripts .= $this->makeResourceLoaderLink( $this->getModuleMessages( true, 'top' ), ResourceLoaderModule::TYPE_MESSAGES );
2788                 $scripts .= $this->makeResourceLoaderLink( $this->getModuleScripts( true, 'top' ), ResourceLoaderModule::TYPE_SCRIPTS );
2789
2790                 // Modules requests - let the client calculate dependencies and batch requests as it likes
2791                 // Only load modules that have marked themselves for loading at the top
2792                 $modules = $this->getModules( true, 'top' );
2793                 if ( $modules ) {
2794                         $scripts .= Html::inlineScript(
2795                                 ResourceLoader::makeLoaderConditionalScript(
2796                                         Xml::encodeJsCall( 'mw.loader.load', array( $modules ) )
2797                                 )
2798                         );
2799                 }
2800
2801                 if ( $wgResourceLoaderExperimentalAsyncLoading ) {
2802                         $scripts .= $this->getScriptsForBottomQueue( true );
2803                 }
2804
2805                 return $scripts;
2806         }
2807
2808         /**
2809          * JS stuff to put at the 'bottom', which can either be the bottom of the "<body>"
2810          * or the bottom of the "<head>" depending on $wgResourceLoaderExperimentalAsyncLoading:
2811          * modules marked with position 'bottom', legacy scripts ($this->mScripts),
2812          * user preferences, site JS and user JS
2813          *
2814          * @param $inHead boolean If true, this HTML goes into the "<head>", if false it goes into the "<body>"
2815          * @return string
2816          */
2817         function getScriptsForBottomQueue( $inHead ) {
2818                 global $wgUseSiteJs, $wgAllowUserJs;
2819
2820                 // Script and Messages "only" requests marked for bottom inclusion
2821                 // If we're in the <head>, use load() calls rather than <script src="..."> tags
2822                 // Messages should go first
2823                 $scripts = $this->makeResourceLoaderLink( $this->getModuleMessages( true, 'bottom' ),
2824                         ResourceLoaderModule::TYPE_MESSAGES, /* $useESI = */ false, /* $extraQuery = */ array(),
2825                         /* $loadCall = */ $inHead
2826                 );
2827                 $scripts .= $this->makeResourceLoaderLink( $this->getModuleScripts( true, 'bottom' ),
2828                         ResourceLoaderModule::TYPE_SCRIPTS, /* $useESI = */ false, /* $extraQuery = */ array(),
2829                         /* $loadCall = */ $inHead
2830                 );
2831
2832                 // Modules requests - let the client calculate dependencies and batch requests as it likes
2833                 // Only load modules that have marked themselves for loading at the bottom
2834                 $modules = $this->getModules( true, 'bottom' );
2835                 if ( $modules ) {
2836                         $scripts .= Html::inlineScript(
2837                                 ResourceLoader::makeLoaderConditionalScript(
2838                                         Xml::encodeJsCall( 'mw.loader.load', array( $modules, null, true ) )
2839                                 )
2840                         );
2841                 }
2842
2843                 // Legacy Scripts
2844                 $scripts .= "\n" . $this->mScripts;
2845
2846                 $defaultModules = array();
2847
2848                 // Add site JS if enabled
2849                 if ( $wgUseSiteJs ) {
2850                         $scripts .= $this->makeResourceLoaderLink( 'site', ResourceLoaderModule::TYPE_SCRIPTS,
2851                                 /* $useESI = */ false, /* $extraQuery = */ array(), /* $loadCall = */ $inHead
2852                         );
2853                         $defaultModules['site'] = 'loading';
2854                 } else {
2855                         // Site module is empty, save request by marking ready in advance (bug 46857)
2856                         $defaultModules['site'] = 'ready';
2857                 }
2858
2859                 // Add user JS if enabled
2860                 if ( $wgAllowUserJs ) {
2861                         if ( $this->getUser()->isLoggedIn() ) {
2862                                 if ( $this->getTitle() && $this->getTitle()->isJsSubpage() && $this->userCanPreview() ) {
2863                                         # XXX: additional security check/prompt?
2864                                         // We're on a preview of a JS subpage
2865                                         // Exclude this page from the user module in case it's in there (bug 26283)
2866                                         $scripts .= $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_SCRIPTS, false,
2867                                                 array( 'excludepage' => $this->getTitle()->getPrefixedDBkey() ), $inHead
2868                                         );
2869                                         // Load the previewed JS
2870                                         $scripts .= Html::inlineScript( "\n" . $this->getRequest()->getText( 'wpTextbox1' ) . "\n" ) . "\n";
2871                                         // FIXME: If the user is previewing, say, ./vector.js, his ./common.js will be loaded
2872                                         // asynchronously and may arrive *after* the inline script here. So the previewed code
2873                                         // may execute before ./common.js runs. Normally, ./common.js runs before ./vector.js...
2874                                 } else {
2875                                         // Include the user module normally, i.e., raw to avoid it being wrapped in a closure.
2876                                         $scripts .= $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_SCRIPTS,
2877                                                 /* $useESI = */ false, /* $extraQuery = */ array(), /* $loadCall = */ $inHead
2878                                         );
2879                                 }
2880                                 $defaultModules['user'] = 'loading';
2881                         } else {
2882                                 // Non-logged-in users have an empty user module.
2883                                 // Save request by marking ready in advance (bug 46857)
2884                                 $defaultModules['user'] = 'ready';
2885                         }
2886                 } else {
2887                         // User modules are disabled on this wiki.
2888                         // Save request by marking ready in advance (bug 46857)
2889                         $defaultModules['user'] = 'ready';
2890                 }
2891
2892                 // Group JS is only enabled if site JS is enabled.
2893                 if ( $wgUseSiteJs ) {
2894                         if ( $this->getUser()->isLoggedIn() ) {
2895                                 $scripts .= $this->makeResourceLoaderLink( 'user.groups', ResourceLoaderModule::TYPE_COMBINED,
2896                                         /* $useESI = */ false, /* $extraQuery = */ array(), /* $loadCall = */ $inHead
2897                                 );
2898                                 $defaultModules['user.groups'] = 'loading';
2899                         } else {
2900                                 // Non-logged-in users have no user.groups module.
2901                                 // Save request by marking ready in advance (bug 46857)
2902                                 $defaultModules['user.groups'] = 'ready';
2903                         }
2904                 } else {
2905                         // Site (and group JS) disabled
2906                         $defaultModules['user.groups'] = 'ready';
2907                 }
2908
2909                 $loaderInit = '';
2910                 if ( $inHead ) {
2911                         // We generate loader calls anyway, so no need to fix the client-side loader's state to 'loading'.
2912                         foreach ( $defaultModules as $m => $state ) {
2913                                 if ( $state == 'loading' ) {
2914                                         unset( $defaultModules[$m] );
2915                                 }
2916                         }
2917                 }
2918                 if ( count( $defaultModules ) > 0 ) {
2919                         $loaderInit = Html::inlineScript(
2920                                 ResourceLoader::makeLoaderConditionalScript(
2921                                         ResourceLoader::makeLoaderStateScript( $defaultModules )
2922                                 )
2923                         ) . "\n";
2924                 }
2925                 return $loaderInit . $scripts;
2926         }
2927
2928         /**
2929          * JS stuff to put at the bottom of the "<body>"
2930          * @return string
2931          */
2932         function getBottomScripts() {
2933                 global $wgResourceLoaderExperimentalAsyncLoading;
2934
2935                 // Optimise jQuery ready event cross-browser.
2936                 // This also enforces $.isReady to be true at </body> which fixes the
2937                 // mw.loader bug in Firefox with using document.write between </body>
2938                 // and the DOMContentReady event (bug 47457).
2939                 $html = Html::inlineScript( 'window.jQuery && jQuery.ready();' );
2940
2941                 if ( !$wgResourceLoaderExperimentalAsyncLoading ) {
2942                         $html .= $this->getScriptsForBottomQueue( false );
2943                 }
2944
2945                 return $html;
2946         }
2947
2948         /**
2949          * Add one or more variables to be set in mw.config in JavaScript.
2950          *
2951          * @param $keys {String|Array} Key or array of key/value pairs.
2952          * @param $value {Mixed} [optional] Value of the configuration variable.
2953          */
2954         public function addJsConfigVars( $keys, $value = null ) {
2955                 if ( is_array( $keys ) ) {
2956                         foreach ( $keys as $key => $value ) {
2957                                 $this->mJsConfigVars[$key] = $value;
2958                         }
2959                         return;
2960                 }
2961
2962                 $this->mJsConfigVars[$keys] = $value;
2963         }
2964
2965         /**
2966          * Get an array containing the variables to be set in mw.config in JavaScript.
2967          *
2968          * DO NOT CALL THIS FROM OUTSIDE OF THIS CLASS OR Skin::makeGlobalVariablesScript().
2969          * This is only public until that function is removed. You have been warned.
2970          *
2971          * Do not add things here which can be evaluated in ResourceLoaderStartUpModule
2972          * - in other words, page-independent/site-wide variables (without state).
2973          * You will only be adding bloat to the html page and causing page caches to
2974          * have to be purged on configuration changes.
2975          * @return array
2976          */
2977         public function getJSVars() {
2978                 global $wgContLang;
2979
2980                 $latestRevID = 0;
2981                 $pageID = 0;
2982                 $canonicalName = false; # bug 21115
2983
2984                 $title = $this->getTitle();
2985                 $ns = $title->getNamespace();
2986                 $nsname = MWNamespace::exists( $ns ) ? MWNamespace::getCanonicalName( $ns ) : $title->getNsText();
2987
2988                 // Get the relevant title so that AJAX features can use the correct page name
2989                 // when making API requests from certain special pages (bug 34972).
2990                 $relevantTitle = $this->getSkin()->getRelevantTitle();
2991
2992                 if ( $ns == NS_SPECIAL ) {
2993                         list( $canonicalName, /*...*/ ) = SpecialPageFactory::resolveAlias( $title->getDBkey() );
2994                 } elseif ( $this->canUseWikiPage() ) {
2995                         $wikiPage = $this->getWikiPage();
2996                         $latestRevID = $wikiPage->getLatest();
2997                         $pageID = $wikiPage->getId();
2998                 }
2999
3000                 $lang = $title->getPageLanguage();
3001
3002                 // Pre-process information
3003                 $separatorTransTable = $lang->separatorTransformTable();
3004                 $separatorTransTable = $separatorTransTable ? $separatorTransTable : array();
3005                 $compactSeparatorTransTable = array(
3006                         implode( "\t", array_keys( $separatorTransTable ) ),
3007                         implode( "\t", $separatorTransTable ),
3008                 );
3009                 $digitTransTable = $lang->digitTransformTable();
3010                 $digitTransTable = $digitTransTable ? $digitTransTable : array();
3011                 $compactDigitTransTable = array(
3012                         implode( "\t", array_keys( $digitTransTable ) ),
3013                         implode( "\t", $digitTransTable ),
3014                 );
3015
3016                 $user = $this->getUser();
3017
3018                 $vars = array(
3019                         'wgCanonicalNamespace' => $nsname,
3020                         'wgCanonicalSpecialPageName' => $canonicalName,
3021                         'wgNamespaceNumber' => $title->getNamespace(),
3022                         'wgPageName' => $title->getPrefixedDBkey(),
3023                         'wgTitle' => $title->getText(),
3024                         'wgCurRevisionId' => $latestRevID,
3025                         'wgArticleId' => $pageID,
3026                         'wgIsArticle' => $this->isArticle(),
3027                         'wgAction' => Action::getActionName( $this->getContext() ),
3028                         'wgUserName' => $user->isAnon() ? null : $user->getName(),
3029                         'wgUserGroups' => $user->getEffectiveGroups(),
3030                         'wgCategories' => $this->getCategories(),
3031                         'wgBreakFrames' => $this->getFrameOptions() == 'DENY',
3032                         'wgPageContentLanguage' => $lang->getCode(),
3033                         'wgPageContentModel' => $title->getContentModel(),
3034                         'wgSeparatorTransformTable' => $compactSeparatorTransTable,
3035                         'wgDigitTransformTable' => $compactDigitTransTable,
3036                         'wgDefaultDateFormat' => $lang->getDefaultDateFormat(),
3037                         'wgMonthNames' => $lang->getMonthNamesArray(),
3038                         'wgMonthNamesShort' => $lang->getMonthAbbreviationsArray(),
3039                         'wgRelevantPageName' => $relevantTitle->getPrefixedDBkey(),
3040                 );
3041                 if ( $user->isLoggedIn() ) {
3042                         $vars['wgUserId'] = $user->getId();
3043                         $vars['wgUserEditCount'] = $user->getEditCount();
3044                         $userReg = wfTimestampOrNull( TS_UNIX, $user->getRegistration() );
3045                         $vars['wgUserRegistration'] = $userReg !== null ? ( $userReg * 1000 ) : null;
3046                         // Get the revision ID of the oldest new message on the user's talk
3047                         // page. This can be used for constructing new message alerts on
3048                         // the client side.
3049                         $vars['wgUserNewMsgRevisionId'] = $user->getNewMessageRevisionId();
3050                 }
3051                 if ( $wgContLang->hasVariants() ) {
3052                         $vars['wgUserVariant'] = $wgContLang->getPreferredVariant();
3053                 }
3054                 foreach ( $title->getRestrictionTypes() as $type ) {
3055                         $vars['wgRestriction' . ucfirst( $type )] = $title->getRestrictions( $type );
3056                 }
3057                 if ( $title->isMainPage() ) {
3058                         $vars['wgIsMainPage'] = true;
3059                 }
3060                 if ( $this->mRedirectedFrom ) {
3061                         $vars['wgRedirectedFrom'] = $this->mRedirectedFrom->getPrefixedDBkey();
3062                 }
3063
3064                 // Allow extensions to add their custom variables to the mw.config map.
3065                 // Use the 'ResourceLoaderGetConfigVars' hook if the variable is not
3066                 // page-dependant but site-wide (without state).
3067                 // Alternatively, you may want to use OutputPage->addJsConfigVars() instead.
3068                 wfRunHooks( 'MakeGlobalVariablesScript', array( &$vars, $this ) );
3069
3070                 // Merge in variables from addJsConfigVars last
3071                 return array_merge( $vars, $this->mJsConfigVars );
3072         }
3073
3074         /**
3075          * To make it harder for someone to slip a user a fake
3076          * user-JavaScript or user-CSS preview, a random token
3077          * is associated with the login session. If it's not
3078          * passed back with the preview request, we won't render
3079          * the code.
3080          *
3081          * @return bool
3082          */
3083         public function userCanPreview() {
3084                 if ( $this->getRequest()->getVal( 'action' ) != 'submit'
3085                         || !$this->getRequest()->wasPosted()
3086                         || !$this->getUser()->matchEditToken(
3087                                 $this->getRequest()->getVal( 'wpEditToken' ) )
3088                 ) {
3089                         return false;
3090                 }
3091                 if ( !$this->getTitle()->isJsSubpage() && !$this->getTitle()->isCssSubpage() ) {
3092                         return false;
3093                 }
3094
3095                 return !count( $this->getTitle()->getUserPermissionsErrors( 'edit', $this->getUser() ) );
3096         }
3097
3098         /**
3099          * @return array in format "link name or number => 'link html'".
3100          */
3101         public function getHeadLinksArray() {
3102                 global $wgUniversalEditButton, $wgFavicon, $wgAppleTouchIcon, $wgEnableAPI,
3103                         $wgSitename, $wgVersion,
3104                         $wgFeed, $wgOverrideSiteFeed, $wgAdvertisedFeedTypes,
3105                         $wgDisableLangConversion, $wgCanonicalLanguageLinks,
3106                         $wgRightsPage, $wgRightsUrl;
3107
3108                 $tags = array();
3109
3110                 $canonicalUrl = $this->mCanonicalUrl;
3111
3112                 $tags['meta-generator'] = Html::element( 'meta', array(
3113                         'name' => 'generator',
3114                         'content' => "MediaWiki $wgVersion",
3115                 ) );
3116
3117                 $p = "{$this->mIndexPolicy},{$this->mFollowPolicy}";
3118                 if ( $p !== 'index,follow' ) {
3119                         // http://www.robotstxt.org/wc/meta-user.html
3120                         // Only show if it's different from the default robots policy
3121                         $tags['meta-robots'] = Html::element( 'meta', array(
3122                                 'name' => 'robots',
3123                                 'content' => $p,
3124                         ) );
3125                 }
3126
3127                 foreach ( $this->mMetatags as $tag ) {
3128                         if ( 0 == strcasecmp( 'http:', substr( $tag[0], 0, 5 ) ) ) {
3129                                 $a = 'http-equiv';
3130                                 $tag[0] = substr( $tag[0], 5 );
3131                         } else {
3132                                 $a = 'name';
3133                         }
3134                         $tagName = "meta-{$tag[0]}";
3135                         if ( isset( $tags[$tagName] ) ) {
3136                                 $tagName .= $tag[1];
3137                         }
3138                         $tags[$tagName] = Html::element( 'meta',
3139                                 array(
3140                                         $a => $tag[0],
3141                                         'content' => $tag[1]
3142                                 )
3143                         );
3144                 }
3145
3146                 foreach ( $this->mLinktags as $tag ) {
3147                         $tags[] = Html::element( 'link', $tag );
3148                 }
3149
3150                 # Universal edit button
3151                 if ( $wgUniversalEditButton && $this->isArticleRelated() ) {
3152                         $user = $this->getUser();
3153                         if ( $this->getTitle()->quickUserCan( 'edit', $user )
3154                                 && ( $this->getTitle()->exists() || $this->getTitle()->quickUserCan( 'create', $user ) ) ) {
3155                                 // Original UniversalEditButton
3156                                 $msg = $this->msg( 'edit' )->text();
3157                                 $tags['universal-edit-button'] = Html::element( 'link', array(
3158                                         'rel' => 'alternate',
3159                                         'type' => 'application/x-wiki',
3160                                         'title' => $msg,
3161                                         'href' => $this->getTitle()->getLocalURL( 'action=edit' )
3162                                 ) );
3163                                 // Alternate edit link
3164                                 $tags['alternative-edit'] = Html::element( 'link', array(
3165                                         'rel' => 'edit',
3166                                         'title' => $msg,
3167                                         'href' => $this->getTitle()->getLocalURL( 'action=edit' )
3168                                 ) );
3169                         }
3170                 }
3171
3172                 # Generally the order of the favicon and apple-touch-icon links
3173                 # should not matter, but Konqueror (3.5.9 at least) incorrectly
3174                 # uses whichever one appears later in the HTML source. Make sure
3175                 # apple-touch-icon is specified first to avoid this.
3176                 if ( $wgAppleTouchIcon !== false ) {
3177                         $tags['apple-touch-icon'] = Html::element( 'link', array( 'rel' => 'apple-touch-icon', 'href' => $wgAppleTouchIcon ) );
3178                 }
3179
3180                 if ( $wgFavicon !== false ) {
3181                         $tags['favicon'] = Html::element( 'link', array( 'rel' => 'shortcut icon', 'href' => $wgFavicon ) );
3182                 }
3183
3184                 # OpenSearch description link
3185                 $tags['opensearch'] = Html::element( 'link', array(
3186                         'rel' => 'search',
3187                         'type' => 'application/opensearchdescription+xml',
3188                         'href' => wfScript( 'opensearch_desc' ),
3189                         'title' => $this->msg( 'opensearch-desc' )->inContentLanguage()->text(),
3190                 ) );
3191
3192                 if ( $wgEnableAPI ) {
3193                         # Real Simple Discovery link, provides auto-discovery information
3194                         # for the MediaWiki API (and potentially additional custom API
3195                         # support such as WordPress or Twitter-compatible APIs for a
3196                         # blogging extension, etc)
3197                         $tags['rsd'] = Html::element( 'link', array(
3198                                 'rel' => 'EditURI',
3199                                 'type' => 'application/rsd+xml',
3200                                 // Output a protocol-relative URL here if $wgServer is protocol-relative
3201                                 // Whether RSD accepts relative or protocol-relative URLs is completely undocumented, though
3202                                 'href' => wfExpandUrl( wfAppendQuery( wfScript( 'api' ), array( 'action' => 'rsd' ) ), PROTO_RELATIVE ),
3203                         ) );
3204                 }
3205
3206                 # Language variants
3207                 if ( !$wgDisableLangConversion && $wgCanonicalLanguageLinks ) {
3208                         $lang = $this->getTitle()->getPageLanguage();
3209                         if ( $lang->hasVariants() ) {
3210
3211                                 $urlvar = $lang->getURLVariant();
3212
3213                                 if ( !$urlvar ) {
3214                                         $variants = $lang->getVariants();
3215                                         foreach ( $variants as $_v ) {
3216                                                 $tags["variant-$_v"] = Html::element( 'link', array(
3217                                                         'rel' => 'alternate',
3218                                                         'hreflang' => $_v,
3219                                                         'href' => $this->getTitle()->getLocalURL( array( 'variant' => $_v ) ) )
3220                                                 );
3221                                         }
3222                                 } else {
3223                                         $canonicalUrl = $this->getTitle()->getLocalURL();
3224                                 }
3225                         }
3226                 }
3227
3228                 # Copyright
3229                 $copyright = '';
3230                 if ( $wgRightsPage ) {
3231                         $copy = Title::newFromText( $wgRightsPage );
3232
3233                         if ( $copy ) {
3234                                 $copyright = $copy->getLocalURL();
3235                         }
3236                 }
3237
3238                 if ( !$copyright && $wgRightsUrl ) {
3239                         $copyright = $wgRightsUrl;
3240                 }
3241
3242                 if ( $copyright ) {
3243                         $tags['copyright'] = Html::element( 'link', array(
3244                                 'rel' => 'copyright',
3245                                 'href' => $copyright )
3246                         );
3247                 }
3248
3249                 # Feeds
3250                 if ( $wgFeed ) {
3251                         foreach ( $this->getSyndicationLinks() as $format => $link ) {
3252                                 # Use the page name for the title.  In principle, this could
3253                                 # lead to issues with having the same name for different feeds
3254                                 # corresponding to the same page, but we can't avoid that at
3255                                 # this low a level.
3256
3257                                 $tags[] = $this->feedLink(
3258                                         $format,
3259                                         $link,
3260                                         # Used messages: 'page-rss-feed' and 'page-atom-feed' (for an easier grep)
3261                                         $this->msg( "page-{$format}-feed", $this->getTitle()->getPrefixedText() )->text()
3262                                 );
3263                         }
3264
3265                         # Recent changes feed should appear on every page (except recentchanges,
3266                         # that would be redundant). Put it after the per-page feed to avoid
3267                         # changing existing behavior. It's still available, probably via a
3268                         # menu in your browser. Some sites might have a different feed they'd
3269                         # like to promote instead of the RC feed (maybe like a "Recent New Articles"
3270                         # or "Breaking news" one). For this, we see if $wgOverrideSiteFeed is defined.
3271                         # If so, use it instead.
3272                         if ( $wgOverrideSiteFeed ) {
3273                                 foreach ( $wgOverrideSiteFeed as $type => $feedUrl ) {
3274                                         // Note, this->feedLink escapes the url.
3275                                         $tags[] = $this->feedLink(
3276                                                 $type,
3277                                                 $feedUrl,
3278                                                 $this->msg( "site-{$type}-feed", $wgSitename )->text()
3279                                         );
3280                                 }
3281                         } elseif ( !$this->getTitle()->isSpecial( 'Recentchanges' ) ) {
3282                                 $rctitle = SpecialPage::getTitleFor( 'Recentchanges' );
3283                                 foreach ( $wgAdvertisedFeedTypes as $format ) {
3284                                         $tags[] = $this->feedLink(
3285                                                 $format,
3286                                                 $rctitle->getLocalURL( array( 'feed' => $format ) ),
3287                                                 $this->msg( "site-{$format}-feed", $wgSitename )->text() # For grep: 'site-rss-feed', 'site-atom-feed'.
3288                                         );
3289                                 }
3290                         }
3291                 }
3292
3293                 # Canonical URL
3294                 global $wgEnableCanonicalServerLink;
3295                 if ( $wgEnableCanonicalServerLink ) {
3296                         if ( $canonicalUrl !== false ) {
3297                                 $canonicalUrl = wfExpandUrl( $canonicalUrl, PROTO_CANONICAL );
3298                         } else {
3299                                 $reqUrl = $this->getRequest()->getRequestURL();
3300                                 $canonicalUrl = wfExpandUrl( $reqUrl, PROTO_CANONICAL );
3301                         }
3302                 }
3303                 if ( $canonicalUrl !== false ) {
3304                         $tags[] = Html::element( 'link', array(
3305                                 'rel' => 'canonical',
3306                                 'href' => $canonicalUrl
3307                         ) );
3308                 }
3309
3310                 return $tags;
3311         }
3312
3313         /**
3314          * @return string HTML tag links to be put in the header.
3315          */
3316         public function getHeadLinks() {
3317                 return implode( "\n", $this->getHeadLinksArray() );
3318         }
3319
3320         /**
3321          * Generate a "<link rel/>" for a feed.
3322          *
3323          * @param string $type feed type
3324          * @param string $url URL to the feed
3325          * @param string $text value of the "title" attribute
3326          * @return String: HTML fragment
3327          */
3328         private function feedLink( $type, $url, $text ) {
3329                 return Html::element( 'link', array(
3330                         'rel' => 'alternate',
3331                         'type' => "application/$type+xml",
3332                         'title' => $text,
3333                         'href' => $url )
3334                 );
3335         }
3336
3337         /**
3338          * Add a local or specified stylesheet, with the given media options.
3339          * Meant primarily for internal use...
3340          *
3341          * @param string $style URL to the file
3342          * @param string $media to specify a media type, 'screen', 'printable', 'handheld' or any.
3343          * @param string $condition for IE conditional comments, specifying an IE version
3344          * @param string $dir set to 'rtl' or 'ltr' for direction-specific sheets
3345          */
3346         public function addStyle( $style, $media = '', $condition = '', $dir = '' ) {
3347                 $options = array();
3348                 // Even though we expect the media type to be lowercase, but here we
3349                 // force it to lowercase to be safe.
3350                 if ( $media ) {
3351                         $options['media'] = $media;
3352                 }
3353                 if ( $condition ) {
3354                         $options['condition'] = $condition;
3355                 }
3356                 if ( $dir ) {
3357                         $options['dir'] = $dir;
3358                 }
3359                 $this->styles[$style] = $options;
3360         }
3361
3362         /**
3363          * Adds inline CSS styles
3364          * @param $style_css Mixed: inline CSS
3365          * @param string $flip Set to 'flip' to flip the CSS if needed
3366          */
3367         public function addInlineStyle( $style_css, $flip = 'noflip' ) {
3368                 if ( $flip === 'flip' && $this->getLanguage()->isRTL() ) {
3369                         # If wanted, and the interface is right-to-left, flip the CSS
3370                         $style_css = CSSJanus::transform( $style_css, true, false );
3371                 }
3372                 $this->mInlineStyles .= Html::inlineStyle( $style_css );
3373         }
3374
3375         /**
3376          * Build a set of "<link>" elements for the stylesheets specified in the $this->styles array.
3377          * These will be applied to various media & IE conditionals.
3378          *
3379          * @return string
3380          */
3381         public function buildCssLinks() {
3382                 global $wgUseSiteCss, $wgAllowUserCss, $wgAllowUserCssPrefs, $wgContLang;
3383
3384                 $this->getSkin()->setupSkinUserCss( $this );
3385
3386                 // Add ResourceLoader styles
3387                 // Split the styles into four groups
3388                 $styles = array( 'other' => array(), 'user' => array(), 'site' => array(), 'private' => array(), 'noscript' => array() );
3389                 $otherTags = ''; // Tags to append after the normal <link> tags
3390                 $resourceLoader = $this->getResourceLoader();
3391
3392                 $moduleStyles = $this->getModuleStyles();
3393
3394                 // Per-site custom styles
3395                 if ( $wgUseSiteCss ) {
3396                         $moduleStyles[] = 'site';
3397                         $moduleStyles[] = 'noscript';
3398                         if ( $this->getUser()->isLoggedIn() ) {
3399                                 $moduleStyles[] = 'user.groups';
3400                         }
3401                 }
3402
3403                 // Per-user custom styles
3404                 if ( $wgAllowUserCss ) {
3405                         if ( $this->getTitle()->isCssSubpage() && $this->userCanPreview() ) {
3406                                 // We're on a preview of a CSS subpage
3407                                 // Exclude this page from the user module in case it's in there (bug 26283)
3408                                 $otherTags .= $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_STYLES, false,
3409                                         array( 'excludepage' => $this->getTitle()->getPrefixedDBkey() )
3410                                 );
3411
3412                                 // Load the previewed CSS
3413                                 // If needed, Janus it first. This is user-supplied CSS, so it's
3414                                 // assumed to be right for the content language directionality.
3415                                 $previewedCSS = $this->getRequest()->getText( 'wpTextbox1' );
3416                                 if ( $this->getLanguage()->getDir() !== $wgContLang->getDir() ) {
3417                                         $previewedCSS = CSSJanus::transform( $previewedCSS, true, false );
3418                                 }
3419                                 $otherTags .= Html::inlineStyle( $previewedCSS );
3420                         } else {
3421                                 // Load the user styles normally
3422                                 $moduleStyles[] = 'user';
3423                         }
3424                 }
3425
3426                 // Per-user preference styles
3427                 if ( $wgAllowUserCssPrefs ) {
3428                         $moduleStyles[] = 'user.cssprefs';
3429                 }
3430
3431                 foreach ( $moduleStyles as $name ) {
3432                         $module = $resourceLoader->getModule( $name );
3433                         if ( !$module ) {
3434                                 continue;
3435                         }
3436                         $group = $module->getGroup();
3437                         // Modules in groups named "other" or anything different than "user", "site" or "private"
3438                         // will be placed in the "other" group
3439                         $styles[isset( $styles[$group] ) ? $group : 'other'][] = $name;
3440                 }
3441
3442                 // We want site, private and user styles to override dynamically added styles from modules, but we want
3443                 // dynamically added styles to override statically added styles from other modules. So the order
3444                 // has to be other, dynamic, site, private, user
3445                 // Add statically added styles for other modules
3446                 $ret = $this->makeResourceLoaderLink( $styles['other'], ResourceLoaderModule::TYPE_STYLES );
3447                 // Add normal styles added through addStyle()/addInlineStyle() here
3448                 $ret .= implode( "\n", $this->buildCssLinksArray() ) . $this->mInlineStyles;
3449                 // Add marker tag to mark the place where the client-side loader should inject dynamic styles
3450                 // We use a <meta> tag with a made-up name for this because that's valid HTML
3451                 $ret .= Html::element( 'meta', array( 'name' => 'ResourceLoaderDynamicStyles', 'content' => '' ) ) . "\n";
3452
3453                 // Add site, private and user styles
3454                 // 'private' at present only contains user.options, so put that before 'user'
3455                 // Any future private modules will likely have a similar user-specific character
3456                 foreach ( array( 'site', 'noscript', 'private', 'user' ) as $group ) {
3457                         $ret .= $this->makeResourceLoaderLink( $styles[$group],
3458                                         ResourceLoaderModule::TYPE_STYLES
3459                         );
3460                 }
3461
3462                 // Add stuff in $otherTags (previewed user CSS if applicable)
3463                 $ret .= $otherTags;
3464                 return $ret;
3465         }
3466
3467         /**
3468          * @return Array
3469          */
3470         public function buildCssLinksArray() {
3471                 $links = array();
3472
3473                 // Add any extension CSS
3474                 foreach ( $this->mExtStyles as $url ) {
3475                         $this->addStyle( $url );
3476                 }
3477                 $this->mExtStyles = array();
3478
3479                 foreach ( $this->styles as $file => $options ) {
3480                         $link = $this->styleLink( $file, $options );
3481                         if ( $link ) {
3482                                 $links[$file] = $link;
3483                         }
3484                 }
3485                 return $links;
3486         }
3487
3488         /**
3489          * Generate \<link\> tags for stylesheets
3490          *
3491          * @param string $style URL to the file
3492          * @param array $options option, can contain 'condition', 'dir', 'media'
3493          *                 keys
3494          * @return String: HTML fragment
3495          */
3496         protected function styleLink( $style, $options ) {
3497                 if ( isset( $options['dir'] ) ) {
3498                         if ( $this->getLanguage()->getDir() != $options['dir'] ) {
3499                                 return '';
3500                         }
3501                 }
3502
3503                 if ( isset( $options['media'] ) ) {
3504                         $media = self::transformCssMedia( $options['media'] );
3505                         if ( is_null( $media ) ) {
3506                                 return '';
3507                         }
3508                 } else {
3509                         $media = 'all';
3510                 }
3511
3512                 if ( substr( $style, 0, 1 ) == '/' ||
3513                         substr( $style, 0, 5 ) == 'http:' ||
3514                         substr( $style, 0, 6 ) == 'https:' ) {
3515                         $url = $style;
3516                 } else {
3517                         global $wgStylePath, $wgStyleVersion;
3518                         $url = $wgStylePath . '/' . $style . '?' . $wgStyleVersion;
3519                 }
3520
3521                 $link = Html::linkedStyle( $url, $media );
3522
3523                 if ( isset( $options['condition'] ) ) {
3524                         $condition = htmlspecialchars( $options['condition'] );
3525                         $link = "<!--[if $condition]>$link<![endif]-->";
3526                 }
3527                 return $link;
3528         }
3529
3530         /**
3531          * Transform "media" attribute based on request parameters
3532          *
3533          * @param string $media current value of the "media" attribute
3534          * @return String: modified value of the "media" attribute, or null to skip
3535          * this stylesheet
3536          */
3537         public static function transformCssMedia( $media ) {
3538                 global $wgRequest;
3539
3540                 // http://www.w3.org/TR/css3-mediaqueries/#syntax
3541                 $screenMediaQueryRegex = '/^(?:only\s+)?screen\b/i';
3542
3543                 // Switch in on-screen display for media testing
3544                 $switches = array(
3545                         'printable' => 'print',
3546                         'handheld' => 'handheld',
3547                 );
3548                 foreach ( $switches as $switch => $targetMedia ) {
3549                         if ( $wgRequest->getBool( $switch ) ) {
3550                                 if ( $media == $targetMedia ) {
3551                                         $media = '';
3552                                 } elseif ( preg_match( $screenMediaQueryRegex, $media ) === 1 ) {
3553                                         // This regex will not attempt to understand a comma-separated media_query_list
3554                                         //
3555                                         // Example supported values for $media: 'screen', 'only screen', 'screen and (min-width: 982px)' ),
3556                                         // Example NOT supported value for $media: '3d-glasses, screen, print and resolution > 90dpi'
3557                                         //
3558                                         // If it's a print request, we never want any kind of screen stylesheets
3559                                         // If it's a handheld request (currently the only other choice with a switch),
3560                                         // we don't want simple 'screen' but we might want screen queries that
3561                                         // have a max-width or something, so we'll pass all others on and let the
3562                                         // client do the query.
3563                                         if ( $targetMedia == 'print' || $media == 'screen' ) {
3564                                                 return null;
3565                                         }
3566                                 }
3567                         }
3568                 }
3569
3570                 return $media;
3571         }
3572
3573         /**
3574          * Add a wikitext-formatted message to the output.
3575          * This is equivalent to:
3576          *
3577          *    $wgOut->addWikiText( wfMessage( ... )->plain() )
3578          */
3579         public function addWikiMsg( /*...*/ ) {
3580                 $args = func_get_args();
3581                 $name = array_shift( $args );
3582                 $this->addWikiMsgArray( $name, $args );
3583         }
3584
3585         /**
3586          * Add a wikitext-formatted message to the output.
3587          * Like addWikiMsg() except the parameters are taken as an array
3588          * instead of a variable argument list.
3589          *
3590          * @param $name string
3591          * @param $args array
3592          */
3593         public function addWikiMsgArray( $name, $args ) {
3594                 $this->addHTML( $this->msg( $name, $args )->parseAsBlock() );
3595         }
3596
3597         /**
3598          * This function takes a number of message/argument specifications, wraps them in
3599          * some overall structure, and then parses the result and adds it to the output.
3600          *
3601          * In the $wrap, $1 is replaced with the first message, $2 with the second, and so
3602          * on. The subsequent arguments may either be strings, in which case they are the
3603          * message names, or arrays, in which case the first element is the message name,
3604          * and subsequent elements are the parameters to that message.
3605          *
3606          * Don't use this for messages that are not in users interface language.
3607          *
3608          * For example:
3609          *
3610          *    $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>", 'some-error' );
3611          *
3612          * Is equivalent to:
3613          *
3614          *    $wgOut->addWikiText( "<div class='error'>\n" . wfMessage( 'some-error' )->plain() . "\n</div>" );
3615          *
3616          * The newline after opening div is needed in some wikitext. See bug 19226.
3617          *
3618          * @param $wrap string
3619          */
3620         public function wrapWikiMsg( $wrap /*, ...*/ ) {
3621                 $msgSpecs = func_get_args();
3622                 array_shift( $msgSpecs );
3623                 $msgSpecs = array_values( $msgSpecs );
3624                 $s = $wrap;
3625                 foreach ( $msgSpecs as $n => $spec ) {
3626                         if ( is_array( $spec ) ) {
3627                                 $args = $spec;
3628                                 $name = array_shift( $args );
3629                                 if ( isset( $args['options'] ) ) {
3630                                         unset( $args['options'] );
3631                                         wfDeprecated(
3632                                                 'Adding "options" to ' . __METHOD__ . ' is no longer supported',
3633                                                 '1.20'
3634                                         );
3635                                 }
3636                         } else {
3637                                 $args = array();
3638                                 $name = $spec;
3639                         }
3640                         $s = str_replace( '$' . ( $n + 1 ), $this->msg( $name, $args )->plain(), $s );
3641                 }
3642                 $this->addWikiText( $s );
3643         }
3644
3645         /**
3646          * Include jQuery core. Use this to avoid loading it multiple times
3647          * before we get a usable script loader.
3648          *
3649          * @param array $modules list of jQuery modules which should be loaded
3650          * @return Array: the list of modules which were not loaded.
3651          * @since 1.16
3652          * @deprecated since 1.17
3653          */
3654         public function includeJQuery( $modules = array() ) {
3655                 return array();
3656         }
3657
3658 }